diff --git a/server/pyproject.toml b/server/pyproject.toml
index da52924..8f6116b 100644
--- a/server/pyproject.toml
+++ b/server/pyproject.toml
@@ -36,6 +36,7 @@ dependencies = [
     "python-json-logger>=3.1.0",
     "python-dateutil>=2.9.0",
     "python-multipart>=0.0.12",
+    "jinja2>=3.1.0",
     "wmi>=1.5.1; sys_platform == 'win32'",
     "zeroconf>=0.131.0",
     "pyserial>=3.5",
diff --git a/server/src/wled_controller/main.py b/server/src/wled_controller/main.py
index 9f9a5b9..d5ee020 100644
--- a/server/src/wled_controller/main.py
+++ b/server/src/wled_controller/main.py
@@ -6,8 +6,10 @@ from pathlib import Path
 
 from fastapi import FastAPI
 from fastapi.middleware.cors import CORSMiddleware
-from fastapi.responses import JSONResponse, FileResponse
+from fastapi.responses import JSONResponse
 from fastapi.staticfiles import StaticFiles
+from fastapi.templating import Jinja2Templates
+from starlette.requests import Request
 
 from wled_controller import __version__
 from wled_controller.api import router
@@ -262,6 +264,10 @@ if static_path.exists():
 else:
     logger.warning(f"Static files directory not found: {static_path}")
 
+# Jinja2 templates
+templates_path = Path(__file__).parent / "templates"
+templates = Jinja2Templates(directory=str(templates_path))
+
 
 @app.exception_handler(Exception)
 async def global_exception_handler(request, exc):
@@ -279,20 +285,9 @@ async def global_exception_handler(request, exc):
 
 
 @app.get("/")
-async def root():
+async def root(request: Request):
     """Serve the web UI dashboard."""
-    static_path = Path(__file__).parent / "static" / "index.html"
-    if static_path.exists():
-        return FileResponse(static_path)
-
-    # Fallback to JSON if static files not found
-    return {
-        "name": "LED Grab",
-        "version": __version__,
-        "docs": "/docs",
-        "health": "/health",
-        "api": "/api/v1",
-    }
+    return templates.TemplateResponse(request, "index.html")
 
 
 if __name__ == "__main__":
diff --git a/server/src/wled_controller/static/css/base.css b/server/src/wled_controller/static/css/base.css
new file mode 100644
index 0000000..8070b3a
--- /dev/null
+++ b/server/src/wled_controller/static/css/base.css
@@ -0,0 +1,61 @@
+* {
+    margin: 0;
+    padding: 0;
+    box-sizing: border-box;
+}
+
+:root {
+    --primary-color: #4CAF50;
+    --danger-color: #f44336;
+    --warning-color: #ff9800;
+    --info-color: #2196F3;
+}
+
+/* Dark theme (default) */
+[data-theme="dark"] {
+    --bg-color: #1a1a1a;
+    --card-bg: #2d2d2d;
+    --text-color: #e0e0e0;
+    --border-color: #404040;
+    --display-badge-bg: rgba(0, 0, 0, 0.4);
+    color-scheme: dark;
+}
+
+/* Light theme */
+[data-theme="light"] {
+    --bg-color: #f5f5f5;
+    --card-bg: #ffffff;
+    --text-color: #333333;
+    --border-color: #e0e0e0;
+    --display-badge-bg: rgba(255, 255, 255, 0.85);
+    color-scheme: light;
+}
+
+/* Default to dark theme */
+body {
+    background: var(--bg-color);
+    color: var(--text-color);
+}
+
+html {
+    background: var(--bg-color);
+    overflow-y: scroll;
+}
+
+body {
+    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
+    background: var(--bg-color);
+    color: var(--text-color);
+    line-height: 1.6;
+}
+
+body.modal-open {
+    position: fixed;
+    width: 100%;
+}
+
+.container {
+    max-width: 1200px;
+    margin: 0 auto;
+    padding: 20px;
+}
diff --git a/server/src/wled_controller/static/css/calibration.css b/server/src/wled_controller/static/css/calibration.css
new file mode 100644
index 0000000..ba68c05
--- /dev/null
+++ b/server/src/wled_controller/static/css/calibration.css
@@ -0,0 +1,423 @@
+/* Interactive Calibration Preview Edges */
+.calibration-preview {
+    position: relative;
+    width: 100%;
+    aspect-ratio: 16 / 9;
+    margin: 40px auto 40px;
+    background: var(--card-bg);
+    border: 2px solid var(--border-color);
+    border-radius: 8px;
+    overflow: visible;
+}
+
+#calibration-preview-canvas {
+    position: absolute;
+    top: -40px;
+    left: -40px;
+    width: calc(100% + 80px);
+    height: calc(100% + 80px);
+    pointer-events: none;
+    z-index: 3;
+}
+
+.preview-screen {
+    position: absolute;
+    top: 37px;
+    left: 57px;
+    right: 57px;
+    bottom: 37px;
+    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
+    border-radius: 4px;
+    display: flex;
+    flex-direction: column;
+    align-items: center;
+    justify-content: center;
+    gap: 6px;
+    color: white;
+    font-size: 14px;
+}
+
+.preview-screen-border-width {
+    display: flex;
+    align-items: center;
+    gap: 6px;
+    font-size: 13px;
+    font-weight: 600;
+}
+
+.preview-screen-border-width label {
+    white-space: nowrap;
+}
+
+.preview-screen-border-width input {
+    width: 52px;
+    padding: 2px 4px;
+    font-size: 12px;
+    border: 1px solid rgba(255, 255, 255, 0.4);
+    border-radius: 3px;
+    background: rgba(255, 255, 255, 0.15);
+    color: white;
+    text-align: center;
+}
+
+.preview-screen-border-width input:focus {
+    outline: none;
+    border-color: rgba(255, 255, 255, 0.7);
+    background: rgba(255, 255, 255, 0.25);
+}
+
+.preview-screen-total {
+    font-size: 16px;
+    font-weight: 600;
+    opacity: 0.9;
+    transition: color 0.2s;
+    cursor: pointer;
+    user-select: none;
+}
+
+.preview-screen-total:hover {
+    opacity: 1;
+}
+
+.preview-screen-total.mismatch {
+    color: #FFC107;
+}
+
+.inputs-dimmed .edge-led-input {
+    opacity: 0.2;
+    pointer-events: none;
+}
+
+.preview-screen-controls {
+    display: flex;
+    align-items: center;
+    gap: 6px;
+}
+
+.preview-edge {
+    position: absolute;
+    display: flex;
+    align-items: center;
+    justify-content: center;
+    font-size: 11px;
+    color: var(--text-secondary);
+    background: rgba(128, 128, 128, 0.15);
+    transition: background 0.2s;
+    z-index: 2;
+    user-select: none;
+}
+
+/* Edge test toggle zones — positioned outside the container border */
+.edge-toggle {
+    position: absolute;
+    cursor: pointer;
+    z-index: 1;
+    background: rgba(128, 128, 128, 0.1);
+    border: 1px solid rgba(128, 128, 128, 0.35);
+    border-radius: 3px;
+    transition: background 0.2s, box-shadow 0.2s;
+}
+
+.edge-toggle:hover {
+    background: rgba(128, 128, 128, 0.25);
+}
+
+.preview-edge.edge-disabled {
+    opacity: 0.25;
+    pointer-events: none;
+}
+
+.preview-edge.edge-disabled .edge-led-input {
+    pointer-events: auto;
+    opacity: 1;
+}
+
+.edge-toggle.edge-disabled {
+    opacity: 0.15;
+    pointer-events: none;
+    cursor: default;
+}
+
+.toggle-top {
+    top: -16px;
+    left: 56px;
+    right: 56px;
+    height: 16px;
+}
+
+.toggle-bottom {
+    bottom: -16px;
+    left: 56px;
+    right: 56px;
+    height: 16px;
+}
+
+.toggle-left {
+    left: -16px;
+    top: 36px;
+    bottom: 36px;
+    width: 16px;
+}
+
+.toggle-right {
+    right: -16px;
+    top: 36px;
+    bottom: 36px;
+    width: 16px;
+}
+
+.edge-top {
+    top: 0;
+    left: 56px;
+    right: 56px;
+    height: 36px;
+    border-radius: 6px 6px 0 0;
+    flex-direction: row;
+    gap: 8px;
+}
+
+.edge-bottom {
+    bottom: 0;
+    left: 56px;
+    right: 56px;
+    height: 36px;
+    border-radius: 0 0 6px 6px;
+    flex-direction: row;
+    gap: 8px;
+}
+
+.edge-left {
+    left: 0;
+    top: 36px;
+    bottom: 36px;
+    width: 56px;
+    flex-direction: column;
+    border-radius: 6px 0 0 6px;
+    gap: 4px;
+}
+
+.edge-right {
+    right: 0;
+    top: 36px;
+    bottom: 36px;
+    width: 56px;
+    flex-direction: column;
+    border-radius: 0 6px 6px 0;
+    gap: 4px;
+}
+
+.edge-led-input {
+    width: 46px;
+    padding: 2px 2px;
+    font-size: 12px;
+    box-sizing: border-box;
+    max-height: 100%;
+    text-align: center;
+    background: rgba(0, 0, 0, 0.3);
+    border: 1px solid rgba(255, 255, 255, 0.2);
+    border-radius: 3px;
+    color: inherit;
+}
+
+.edge-led-input:focus {
+    border-color: var(--primary-color);
+    outline: none;
+}
+
+.edge-top .edge-led-input,
+.edge-bottom .edge-led-input {
+    width: 56px;
+}
+
+/* Hide spinner arrows on edge inputs to save space */
+.edge-led-input::-webkit-outer-spin-button,
+.edge-led-input::-webkit-inner-spin-button {
+    -webkit-appearance: none;
+    margin: 0;
+}
+.edge-led-input[type=number] {
+    -moz-appearance: textfield;
+}
+
+/* Edge span bars */
+.edge-span-bar {
+    position: absolute;
+    background: rgba(76, 175, 80, 0.3);
+    border: 1px solid rgba(76, 175, 80, 0.5);
+    border-radius: 2px;
+    cursor: grab;
+    transition: background 0.15s;
+}
+
+.edge-span-bar:hover {
+    background: rgba(76, 175, 80, 0.45);
+}
+
+.edge-span-bar:active {
+    cursor: grabbing;
+}
+
+/* Horizontal edges: bar spans left-right */
+.edge-top .edge-span-bar,
+.edge-bottom .edge-span-bar {
+    top: 0;
+    bottom: 0;
+}
+
+/* Vertical edges: bar spans top-bottom */
+.edge-left .edge-span-bar,
+.edge-right .edge-span-bar {
+    left: 0;
+    right: 0;
+}
+
+/* Resize handles — large transparent hit area with narrow visible strip */
+.edge-span-handle {
+    position: absolute;
+    background: transparent;
+    z-index: 3;
+    opacity: 0;
+    transition: opacity 0.15s;
+}
+
+.edge-span-handle::after {
+    content: '';
+    position: absolute;
+    background: rgba(255, 255, 255, 0.75);
+    border: 1px solid rgba(76, 175, 80, 0.7);
+    border-radius: 2px;
+}
+
+.edge-span-bar:hover .edge-span-handle {
+    opacity: 1;
+}
+
+/* Horizontal handles */
+.edge-top .edge-span-handle,
+.edge-bottom .edge-span-handle {
+    top: 0;
+    bottom: 0;
+    width: 16px;
+    cursor: ew-resize;
+}
+
+.edge-top .edge-span-handle::after,
+.edge-bottom .edge-span-handle::after {
+    top: 3px;
+    bottom: 3px;
+    left: 6px;
+    width: 4px;
+}
+
+.edge-top .edge-span-handle-start,
+.edge-bottom .edge-span-handle-start {
+    left: -8px;
+}
+
+.edge-top .edge-span-handle-end,
+.edge-bottom .edge-span-handle-end {
+    right: -8px;
+}
+
+/* Vertical handles */
+.edge-left .edge-span-handle,
+.edge-right .edge-span-handle {
+    left: 0;
+    right: 0;
+    height: 16px;
+    cursor: ns-resize;
+}
+
+.edge-left .edge-span-handle::after,
+.edge-right .edge-span-handle::after {
+    left: 3px;
+    right: 3px;
+    top: 6px;
+    height: 4px;
+}
+
+.edge-left .edge-span-handle-start,
+.edge-right .edge-span-handle-start {
+    top: -8px;
+}
+
+.edge-left .edge-span-handle-end,
+.edge-right .edge-span-handle-end {
+    bottom: -8px;
+}
+
+/* Ensure LED input is above span bar */
+.edge-led-input {
+    position: relative;
+    z-index: 2;
+}
+
+/* Corner start-position buttons */
+.preview-corner {
+    position: absolute;
+    width: 56px;
+    height: 36px;
+    display: flex;
+    align-items: center;
+    justify-content: center;
+    font-size: 18px;
+    line-height: 1;
+    color: rgba(128, 128, 128, 0.4);
+    cursor: pointer;
+    z-index: 5;
+    transition: color 0.2s, transform 0.2s, text-shadow 0.2s;
+    user-select: none;
+}
+
+.preview-corner:hover {
+    color: rgba(76, 175, 80, 0.6);
+}
+
+.preview-corner.active:hover {
+    transform: none;
+}
+
+.preview-corner.active {
+    color: #4CAF50;
+    text-shadow: 0 0 8px rgba(76, 175, 80, 0.6);
+    font-size: 22px;
+}
+
+.corner-top-left { top: 0; left: 0; }
+.corner-top-right { top: 0; right: 0; }
+.corner-bottom-left { bottom: 0; left: 0; }
+.corner-bottom-right { bottom: 0; right: 0; }
+
+/* Direction toggle inside screen */
+.direction-toggle {
+    display: flex;
+    align-items: center;
+    gap: 4px;
+    height: 26px;
+    padding: 0 10px;
+    background: rgba(255, 255, 255, 0.15);
+    border: 1px solid rgba(255, 255, 255, 0.3);
+    border-radius: 12px;
+    color: white;
+    font-family: inherit;
+    font-size: 12px;
+    box-sizing: border-box;
+    cursor: pointer;
+    transition: background 0.2s;
+    user-select: none;
+}
+
+.direction-toggle:hover {
+    background: rgba(255, 255, 255, 0.25);
+}
+
+.direction-toggle #direction-icon {
+    font-size: 14px;
+}
+
+.preview-hint {
+    text-align: center;
+    font-size: 0.8rem;
+    color: var(--text-secondary);
+    margin-top: 8px;
+}
diff --git a/server/src/wled_controller/static/css/cards.css b/server/src/wled_controller/static/css/cards.css
new file mode 100644
index 0000000..b810201
--- /dev/null
+++ b/server/src/wled_controller/static/css/cards.css
@@ -0,0 +1,592 @@
+section {
+    margin-bottom: 40px;
+}
+
+.displays-grid,
+.devices-grid {
+    display: grid;
+    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
+    gap: 20px;
+}
+
+.devices-grid > .loading,
+.devices-grid > .loading-spinner {
+    grid-column: 1 / -1;
+}
+
+.add-device-card {
+    display: flex;
+    flex-direction: column;
+    align-items: center;
+    justify-content: center;
+    cursor: pointer;
+    border: 2px dashed var(--border-color);
+    background: transparent;
+    min-height: 160px;
+    transition: border-color 0.2s, background 0.2s;
+}
+
+.add-device-card:hover {
+    border-color: var(--primary-color);
+    background: rgba(33, 150, 243, 0.05);
+}
+
+.add-device-icon {
+    font-size: 2.5rem;
+    font-weight: 300;
+    color: var(--text-secondary);
+    line-height: 1;
+    transition: color 0.2s;
+}
+
+.add-device-card:hover .add-device-icon {
+    color: var(--primary-color);
+}
+
+.add-device-label {
+    font-size: 0.85rem;
+    color: var(--text-secondary);
+    margin-top: 8px;
+}
+
+.card {
+    background: var(--card-bg);
+    border: 1px solid var(--border-color);
+    border-radius: 8px;
+    padding: 12px 20px 20px;
+    position: relative;
+    transition: transform 0.2s, box-shadow 0.2s;
+    display: flex;
+    flex-direction: column;
+}
+
+.card:hover {
+    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.3);
+}
+
+.card-tutorial-btn {
+    position: absolute;
+    bottom: 10px;
+    right: 10px;
+    background: none;
+    border: 1.5px solid var(--border-color);
+    color: var(--text-muted, #777);
+    font-size: 0.7rem;
+    font-weight: bold;
+    width: 20px;
+    height: 20px;
+    display: flex;
+    align-items: center;
+    justify-content: center;
+    cursor: pointer;
+    border-radius: 50%;
+    transition: color 0.2s, background 0.2s, border-color 0.2s;
+    padding: 0;
+}
+
+.card-tutorial-btn:hover {
+    border-color: var(--primary-color);
+    color: var(--primary-color);
+}
+
+
+.card-top-actions {
+    position: absolute;
+    top: 8px;
+    right: 8px;
+    display: flex;
+    align-items: center;
+    gap: 2px;
+}
+
+.card-top-actions .card-remove-btn {
+    position: static;
+}
+
+.card-power-btn {
+    background: none;
+    border: none;
+    color: #777;
+    font-size: 1rem;
+    width: 28px;
+    height: 28px;
+    display: flex;
+    align-items: center;
+    justify-content: center;
+    cursor: pointer;
+    border-radius: 4px;
+    transition: color 0.2s, background 0.2s;
+}
+
+.card-power-btn:hover {
+    color: var(--primary-color);
+    background: rgba(76, 175, 80, 0.1);
+}
+
+.card-remove-btn {
+    position: absolute;
+    top: 10px;
+    right: 10px;
+    background: none;
+    border: none;
+    color: #777;
+    font-size: 1rem;
+    width: 28px;
+    height: 28px;
+    display: flex;
+    align-items: center;
+    justify-content: center;
+    cursor: pointer;
+    border-radius: 4px;
+    transition: color 0.2s, background 0.2s;
+}
+
+.card-remove-btn:hover {
+    color: var(--danger-color);
+    background: rgba(244, 67, 54, 0.1);
+}
+
+.card-header {
+    display: flex;
+    justify-content: space-between;
+    align-items: center;
+    margin-bottom: 10px;
+    padding-right: 30px;
+}
+
+.card-title {
+    font-size: 1.2rem;
+    font-weight: 600;
+    display: flex;
+    align-items: center;
+    gap: 6px;
+    flex-wrap: wrap;
+}
+
+.device-url-badge {
+    display: inline-flex;
+    align-items: center;
+    gap: 4px;
+    font-size: 0.7rem;
+    font-weight: 400;
+    color: var(--text-secondary);
+    background: var(--border-color);
+    padding: 2px 8px;
+    border-radius: 10px;
+    letter-spacing: 0.03em;
+    font-family: monospace;
+    text-decoration: none;
+    transition: background 0.2s;
+}
+
+.device-url-badge:hover {
+    background: var(--text-muted);
+}
+
+.device-url-icon {
+    font-size: 0.6rem;
+}
+
+.card-subtitle {
+    display: flex;
+    align-items: center;
+    gap: 12px;
+    margin-bottom: 15px;
+    flex-wrap: wrap;
+}
+
+.card-meta {
+    font-size: 0.8rem;
+    color: #999;
+    display: inline-flex;
+    align-items: center;
+    gap: 4px;
+}
+
+.device-type-badge {
+    font-size: 10px;
+    font-weight: 700;
+    padding: 1px 6px;
+    border-radius: 3px;
+    background: rgba(255, 255, 255, 0.15);
+    letter-spacing: 0.5px;
+}
+
+/* Device discovery */
+.discovery-section {
+    margin-bottom: 12px;
+}
+.btn-block {
+    width: 100%;
+}
+.discovery-list {
+    max-height: 200px;
+    overflow-y: auto;
+    display: flex;
+    flex-direction: column;
+    gap: 4px;
+    margin-top: 8px;
+}
+.discovery-item {
+    display: flex;
+    justify-content: space-between;
+    align-items: center;
+    padding: 8px 12px;
+    border: 1px solid var(--border-color);
+    border-radius: 4px;
+    background: var(--card-bg);
+    cursor: pointer;
+    transition: opacity 0.15s;
+}
+.discovery-item:not(.discovery-item--added):hover {
+    opacity: 0.8;
+}
+.discovery-item--added {
+    opacity: 0.5;
+    cursor: default;
+}
+.discovery-item-info {
+    display: flex;
+    flex-direction: column;
+    gap: 2px;
+}
+.discovery-badge {
+    font-size: 11px;
+    padding: 2px 8px;
+    border-radius: 10px;
+    background: var(--border-color);
+    white-space: nowrap;
+}
+.discovery-type-badge {
+    font-size: 10px;
+    padding: 1px 5px;
+    border-radius: 3px;
+    background: var(--primary-color);
+    color: #fff;
+    font-weight: 600;
+    vertical-align: middle;
+    margin-right: 2px;
+}
+.modal-divider {
+    border: none;
+    border-top: 1px solid var(--border-color);
+    margin: 12px 0;
+}
+.discovery-loading {
+    display: flex;
+    justify-content: center;
+    padding: 12px;
+}
+.discovery-spinner {
+    width: 20px;
+    height: 20px;
+    border: 2px solid var(--border-color);
+    border-top-color: var(--primary-color);
+    border-radius: 50%;
+    animation: spin 0.8s linear infinite;
+}
+
+.channel-indicator {
+    display: inline-flex;
+    gap: 2px;
+    align-items: center;
+}
+
+.channel-indicator .ch {
+    width: 8px;
+    height: 10px;
+    border-radius: 1px;
+}
+
+.display-card {
+    background: var(--card-bg);
+    border: 1px solid var(--border-color);
+    border-radius: 8px;
+    padding: 15px;
+}
+
+.display-header {
+    display: flex;
+    justify-content: space-between;
+    align-items: center;
+    margin-bottom: 15px;
+}
+
+.display-index {
+    font-size: 1.3rem;
+    font-weight: 700;
+    color: var(--info-color);
+}
+
+.primary-star {
+    color: var(--primary-color);
+    font-size: 1.2rem;
+}
+
+/* Display Layout Visualization */
+.layout-container {
+    position: relative;
+    background: transparent;
+}
+
+.layout-display {
+    position: absolute;
+    border: 3px solid;
+    border-radius: 8px;
+    display: flex;
+    flex-direction: column;
+    align-items: center;
+    justify-content: center;
+    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.2);
+    transition: box-shadow 0.2s, border-color 0.2s;
+}
+
+.layout-display:hover {
+    box-shadow: 0 6px 12px rgba(0, 0, 0, 0.3);
+    z-index: 10;
+}
+
+.layout-display.primary {
+    border-color: var(--primary-color);
+    background: linear-gradient(135deg, rgba(76, 175, 80, 0.15), rgba(76, 175, 80, 0.05));
+}
+
+.layout-display.secondary {
+    border-color: var(--border-color);
+    background: linear-gradient(135deg, rgba(128, 128, 128, 0.1), rgba(128, 128, 128, 0.05));
+}
+
+.layout-position-label {
+    position: absolute;
+    top: 4px;
+    left: 6px;
+    font-size: 0.7rem;
+    color: var(--text-secondary);
+}
+
+.layout-index-label {
+    position: absolute;
+    bottom: 6px;
+    left: 6px;
+    font-size: 0.85rem;
+    font-weight: 600;
+    color: var(--text-color);
+    background: var(--display-badge-bg);
+    padding: 1px 6px;
+    border-radius: 4px;
+    letter-spacing: 0.5px;
+}
+
+.layout-display-label {
+    text-align: center;
+    padding: 5px;
+    display: flex;
+    flex-direction: column;
+    gap: 2px;
+}
+
+.layout-display-label strong {
+    font-size: 0.9rem;
+    color: var(--text-color);
+    font-weight: 600;
+}
+
+.layout-display-label small {
+    font-size: 0.75rem;
+    color: var(--text-secondary);
+}
+
+.primary-indicator {
+    position: absolute;
+    top: 2px;
+    right: 4px;
+    color: var(--primary-color);
+    font-size: 1.5rem;
+    line-height: 1;
+    text-shadow: 0 0 4px rgba(0, 0, 0, 0.4);
+}
+
+
+/* Card brightness slider */
+.brightness-control {
+    padding: 0;
+    margin-bottom: 12px;
+}
+
+.brightness-slider {
+    width: 100%;
+}
+
+.brightness-loading .brightness-slider {
+    opacity: 0.3;
+    pointer-events: none;
+}
+
+/* Static color picker — inline in card-subtitle */
+.static-color-control {
+    display: inline-flex;
+    align-items: center;
+    gap: 4px;
+}
+
+.static-color-picker {
+    width: 22px;
+    height: 18px;
+    padding: 0;
+    border: 1px solid var(--border-color);
+    border-radius: 3px;
+    cursor: pointer;
+    background: none;
+    vertical-align: middle;
+}
+
+.btn-clear-color {
+    background: none;
+    border: none;
+    color: #777;
+    font-size: 0.75rem;
+    cursor: pointer;
+    padding: 0 2px;
+    line-height: 1;
+    border-radius: 3px;
+    transition: color 0.2s;
+}
+
+.btn-clear-color:hover {
+    color: var(--danger-color);
+}
+
+.section-header {
+    display: flex;
+    align-items: center;
+    gap: 10px;
+    margin-bottom: 8px;
+}
+
+.section-header h2 {
+    margin-bottom: 0;
+}
+
+.section-tip {
+    font-size: 0.82rem;
+    color: var(--text-secondary);
+    margin: 0 0 15px 0;
+    line-height: 1.5;
+    padding: 8px 12px;
+    background: rgba(33, 150, 243, 0.08);
+    border-left: 3px solid var(--info-color, #2196F3);
+    border-radius: 0 6px 6px 0;
+}
+
+.section-tip a {
+    color: var(--info-color, #2196F3);
+    text-decoration: underline;
+}
+
+ul.section-tip {
+    list-style: disc;
+    padding-left: 28px;
+}
+
+ul.section-tip li {
+    margin: 2px 0;
+}
+
+.metrics-grid {
+    display: grid;
+    grid-template-columns: 1fr 1fr;
+    gap: 4px 12px;
+    margin-top: 8px;
+}
+
+.metric {
+    display: flex;
+    justify-content: space-between;
+    align-items: center;
+    padding: 3px 8px;
+    background: var(--bg-color);
+    border-radius: 4px;
+}
+
+.metric-value {
+    font-size: 0.9rem;
+    font-weight: 700;
+    color: var(--primary-color);
+}
+
+.metric-label {
+    font-size: 0.8rem;
+    color: #999;
+}
+
+/* Timing breakdown bar */
+.timing-breakdown {
+    margin-top: 8px;
+    padding: 6px 8px;
+    background: var(--bg-color);
+    border-radius: 4px;
+}
+
+.timing-header {
+    display: flex;
+    justify-content: space-between;
+    align-items: center;
+}
+
+.timing-total {
+    font-size: 0.8rem;
+    color: var(--primary-color);
+}
+
+.timing-bar {
+    display: flex;
+    height: 8px;
+    border-radius: 4px;
+    overflow: hidden;
+    margin: 4px 0;
+    gap: 1px;
+}
+
+.timing-seg {
+    min-width: 2px;
+    transition: flex 0.3s ease;
+}
+
+.timing-extract { background: #4CAF50; }
+.timing-map { background: #FF9800; }
+.timing-smooth { background: #2196F3; }
+.timing-send { background: #E91E63; }
+
+.timing-legend {
+    display: flex;
+    flex-wrap: wrap;
+    gap: 8px;
+    font-size: 0.75rem;
+    color: #999;
+    margin-top: 4px;
+}
+
+.timing-legend-item {
+    display: flex;
+    align-items: center;
+    gap: 3px;
+}
+
+.timing-dot {
+    display: inline-block;
+    width: 8px;
+    height: 8px;
+    border-radius: 2px;
+}
+
+.timing-dot.timing-extract { background: #4CAF50; }
+.timing-dot.timing-map { background: #FF9800; }
+.timing-dot.timing-smooth { background: #2196F3; }
+.timing-dot.timing-send { background: #E91E63; }
+
+@media (max-width: 768px) {
+    .displays-grid,
+    .devices-grid {
+        grid-template-columns: 1fr;
+    }
+}
diff --git a/server/src/wled_controller/static/css/components.css b/server/src/wled_controller/static/css/components.css
new file mode 100644
index 0000000..be15d1e
--- /dev/null
+++ b/server/src/wled_controller/static/css/components.css
@@ -0,0 +1,356 @@
+.badge {
+    padding: 4px 12px;
+    border-radius: 12px;
+    font-size: 0.85rem;
+    font-weight: 600;
+}
+
+.badge.processing {
+    background: var(--primary-color);
+    color: white;
+}
+
+.badge.idle {
+    background: var(--warning-color);
+    color: white;
+}
+
+.badge.error {
+    background: var(--danger-color);
+    color: white;
+}
+
+.card-content {
+    margin-bottom: 15px;
+}
+
+.info-row {
+    display: flex;
+    justify-content: space-between;
+    padding: 8px 0;
+    border-bottom: 1px solid var(--border-color);
+}
+
+.info-row:last-child {
+    border-bottom: none;
+}
+
+.info-label {
+    color: #999;
+}
+
+.info-value {
+    font-weight: 600;
+}
+
+.card-actions {
+    display: flex;
+    gap: 8px;
+    margin-top: auto;
+    padding-top: 12px;
+    border-top: 1px solid var(--border-color);
+    align-items: center;
+}
+
+.btn {
+    padding: 8px 16px;
+    border: none;
+    border-radius: 4px;
+    cursor: pointer;
+    font-size: 0.9rem;
+    font-weight: 600;
+    transition: opacity 0.2s;
+    flex: 1 1 auto;
+    min-width: 100px;
+}
+
+.btn:hover {
+    opacity: 0.9;
+}
+
+.btn:disabled {
+    opacity: 0.5;
+    cursor: not-allowed;
+}
+
+.btn-primary {
+    background: var(--primary-color);
+    color: white;
+}
+
+.btn-danger {
+    background: var(--danger-color);
+    color: white;
+}
+
+.btn-secondary {
+    background: var(--border-color);
+    color: var(--text-color);
+}
+
+.btn-icon {
+    min-width: auto;
+    padding: 8px 12px;
+    font-size: 1.2rem;
+    flex: 0 0 auto;
+}
+
+.btn-icon:hover {
+    transform: scale(1.1);
+    opacity: 1;
+}
+
+.form-group {
+    margin-bottom: 15px;
+}
+
+.settings-toggle-group {
+    display: flex;
+    flex-direction: column;
+}
+
+.settings-toggle {
+    position: relative;
+    display: inline-block;
+    width: 34px;
+    height: 18px;
+    cursor: pointer;
+    margin-top: 4px;
+}
+
+.settings-toggle input {
+    opacity: 0;
+    width: 0;
+    height: 0;
+}
+
+.settings-toggle-slider {
+    position: absolute;
+    inset: 0;
+    background: var(--border-color);
+    border-radius: 9px;
+    transition: background 0.2s;
+}
+
+.settings-toggle-slider::after {
+    content: '';
+    position: absolute;
+    top: 2px;
+    left: 2px;
+    width: 14px;
+    height: 14px;
+    background: white;
+    border-radius: 50%;
+    transition: transform 0.2s;
+}
+
+.settings-toggle input:checked + .settings-toggle-slider {
+    background: var(--primary-color);
+}
+
+.settings-toggle input:checked + .settings-toggle-slider::after {
+    transform: translateX(16px);
+}
+
+label {
+    display: block;
+    margin-bottom: 5px;
+    color: #999;
+    font-weight: 500;
+}
+
+input[type="text"],
+input[type="url"],
+input[type="number"],
+input[type="password"],
+select {
+    width: 100%;
+    padding: 10px;
+    border: 1px solid var(--border-color);
+    border-radius: 4px;
+    background: var(--bg-color);
+    color: var(--text-color);
+    font-size: 1rem;
+    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
+    transition: border-color 0.2s, box-shadow 0.2s, opacity 0.2s;
+}
+
+input[type="number"]:disabled,
+input[type="password"]:disabled,
+select:disabled {
+    opacity: 0.4;
+    cursor: not-allowed;
+}
+
+input[type="range"] {
+    width: 100%;
+    margin: 8px 0;
+}
+
+/* Better password field appearance */
+input[type="password"] {
+    letter-spacing: 0.15em;
+}
+
+input:focus,
+select:focus {
+    outline: none;
+    border-color: var(--primary-color);
+    box-shadow: 0 0 0 2px rgba(76, 175, 80, 0.2);
+}
+
+/* Remove browser autofill styling */
+input:-webkit-autofill,
+input:-webkit-autofill:hover,
+input:-webkit-autofill:focus {
+    -webkit-box-shadow: 0 0 0 1000px var(--bg-color) inset;
+    -webkit-text-fill-color: var(--text-color);
+    transition: background-color 5000s ease-in-out 0s;
+}
+
+.loading {
+    text-align: center;
+    padding: 40px;
+    color: #999;
+}
+
+.loading-spinner {
+    display: flex;
+    justify-content: center;
+    align-items: center;
+    padding: 40px;
+}
+
+.loading-spinner::after {
+    content: '';
+    width: 28px;
+    height: 28px;
+    border: 3px solid var(--border-color);
+    border-top-color: var(--primary-color);
+    border-radius: 50%;
+    animation: spin 0.8s linear infinite;
+}
+
+@keyframes spin {
+    to { transform: rotate(360deg); }
+}
+
+/* Full-page overlay spinner */
+.overlay-spinner {
+    position: fixed;
+    top: 0;
+    left: 0;
+    right: 0;
+    bottom: 0;
+    background: rgba(0, 0, 0, 0.7);
+    display: flex;
+    flex-direction: column;
+    align-items: center;
+    justify-content: center;
+    z-index: 9999;
+    backdrop-filter: blur(4px);
+}
+
+.overlay-spinner .progress-container {
+    position: relative;
+    width: 120px;
+    height: 120px;
+}
+
+.overlay-spinner .progress-ring {
+    transform: rotate(-90deg);
+}
+
+.overlay-spinner .progress-ring-circle {
+    transition: stroke-dashoffset 0.1s linear;
+    stroke: var(--primary-color);
+    stroke-width: 4;
+    fill: transparent;
+}
+
+.overlay-spinner .progress-ring-bg {
+    stroke: rgba(255, 255, 255, 0.1);
+    stroke-width: 4;
+    fill: transparent;
+}
+
+.overlay-spinner .progress-content {
+    position: absolute;
+    top: 50%;
+    left: 50%;
+    transform: translate(-50%, -50%);
+    text-align: center;
+}
+
+.overlay-spinner .progress-percentage {
+    color: white;
+    font-size: 28px;
+    font-weight: 600;
+}
+
+.overlay-spinner .spinner-text {
+    margin-top: 24px;
+    color: white;
+    font-size: 16px;
+    font-weight: 500;
+}
+
+.overlay-spinner-close {
+    position: absolute;
+    top: 16px;
+    right: 16px;
+    background: none;
+    border: none;
+    color: rgba(255, 255, 255, 0.6);
+    font-size: 32px;
+    cursor: pointer;
+    line-height: 1;
+    padding: 4px 8px;
+    transition: color 0.15s;
+}
+
+.overlay-spinner-close:hover {
+    color: white;
+}
+
+.toast {
+    position: fixed;
+    bottom: 40px;
+    left: 50%;
+    transform: translateX(-50%) translateY(100px);
+    padding: 16px 24px;
+    border-radius: 8px;
+    color: white;
+    font-weight: 600;
+    font-size: 15px;
+    opacity: 0;
+    transition: opacity 0.3s, transform 0.3s;
+    z-index: 2001;
+    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.6);
+    min-width: 300px;
+    text-align: center;
+}
+
+.toast.show {
+    opacity: 1;
+    transform: translateX(-50%) translateY(0);
+    animation: toastShake 0.5s ease-in-out;
+}
+
+@keyframes toastShake {
+    0%, 100% { transform: translateX(-50%) translateY(0); }
+    10%, 30%, 50%, 70%, 90% { transform: translateX(-50%) translateY(-5px); }
+    20%, 40%, 60%, 80% { transform: translateX(-50%) translateY(5px); }
+}
+
+.toast.success {
+    background: var(--primary-color);
+}
+
+.toast.error {
+    background: var(--danger-color);
+}
+
+.toast.info {
+    background: var(--info-color);
+}
diff --git a/server/src/wled_controller/static/css/dashboard.css b/server/src/wled_controller/static/css/dashboard.css
new file mode 100644
index 0000000..e1b9e32
--- /dev/null
+++ b/server/src/wled_controller/static/css/dashboard.css
@@ -0,0 +1,281 @@
+/* ── Dashboard ── */
+
+.dashboard-section {
+    margin-bottom: 16px;
+}
+
+.dashboard-section-header {
+    font-size: 0.8rem;
+    font-weight: 600;
+    margin-bottom: 6px;
+    color: var(--text-secondary);
+    display: flex;
+    align-items: center;
+    gap: 6px;
+    text-transform: uppercase;
+    letter-spacing: 0.5px;
+    cursor: pointer;
+    user-select: none;
+}
+
+.dashboard-section-chevron {
+    font-size: 0.6rem;
+    color: var(--text-secondary);
+    width: 10px;
+    display: inline-block;
+}
+
+.dashboard-section-count {
+    background: var(--border-color);
+    color: var(--text-secondary);
+    border-radius: 10px;
+    padding: 0 6px;
+    font-size: 0.75rem;
+    font-weight: 600;
+}
+
+.dashboard-subsection {
+    margin-bottom: 10px;
+    padding-left: 16px;
+}
+.dashboard-subsection .dashboard-section-header {
+    font-size: 0.72rem;
+}
+
+.dashboard-stop-all {
+    margin-left: auto;
+    padding: 2px 8px;
+    font-size: 0.7rem;
+    white-space: nowrap;
+    flex: 0 0 auto;
+}
+
+.dashboard-poll-wrap {
+    margin-left: auto;
+    display: flex;
+    align-items: center;
+    gap: 3px;
+}
+
+.dashboard-poll-slider {
+    width: 48px;
+    height: 12px;
+    accent-color: var(--primary-color);
+    cursor: pointer;
+}
+
+.dashboard-poll-value {
+    font-size: 0.6rem;
+    color: var(--text-secondary);
+    min-width: 18px;
+}
+
+.dashboard-target {
+    display: grid;
+    grid-template-columns: 1fr auto auto;
+    align-items: center;
+    gap: 12px;
+    padding: 6px 12px;
+    background: var(--card-bg);
+    border: 1px solid var(--border-color);
+    border-radius: 6px;
+    margin-bottom: 4px;
+}
+
+.dashboard-target-info {
+    display: flex;
+    align-items: center;
+    gap: 6px;
+    min-width: 0;
+    overflow: hidden;
+}
+
+.dashboard-target-icon {
+    font-size: 1rem;
+    flex-shrink: 0;
+}
+
+.dashboard-target-name {
+    font-size: 0.85rem;
+    font-weight: 600;
+    white-space: nowrap;
+    overflow: hidden;
+    text-overflow: ellipsis;
+    display: flex;
+    align-items: center;
+    gap: 4px;
+}
+
+.dashboard-target-name .health-dot {
+    margin-right: 0;
+    flex-shrink: 0;
+}
+
+.dashboard-target-subtitle {
+    font-size: 0.7rem;
+    color: var(--text-secondary);
+    white-space: nowrap;
+    overflow: hidden;
+    text-overflow: ellipsis;
+}
+
+.dashboard-target-metrics {
+    display: flex;
+    gap: 12px;
+    align-items: center;
+}
+
+.dashboard-metric {
+    text-align: center;
+    min-width: 48px;
+}
+
+.dashboard-metric-value {
+    font-size: 0.85rem;
+    font-weight: 700;
+    color: var(--primary-color);
+    line-height: 1.2;
+}
+
+.dashboard-metric-label {
+    font-size: 0.6rem;
+    color: var(--text-secondary);
+    text-transform: uppercase;
+    letter-spacing: 0.3px;
+}
+
+.dashboard-fps-metric {
+    display: flex;
+    align-items: center;
+    gap: 6px;
+    min-width: auto;
+}
+
+.dashboard-fps-sparkline {
+    position: relative;
+    width: 100px;
+    height: 36px;
+}
+
+.dashboard-fps-label {
+    display: flex;
+    flex-direction: column;
+    align-items: center;
+    min-width: 36px;
+    line-height: 1.1;
+}
+
+.dashboard-fps-target {
+    font-weight: 400;
+    opacity: 0.5;
+    font-size: 0.75rem;
+}
+
+.dashboard-target-actions {
+    display: flex;
+    align-items: center;
+    gap: 4px;
+}
+
+.dashboard-status-dot {
+    font-size: 1rem;
+    line-height: 1;
+}
+
+.dashboard-status-dot.active {
+    color: #4CAF50;
+    animation: pulse 2s infinite;
+}
+
+.dashboard-no-targets {
+    text-align: center;
+    padding: 32px 16px;
+    color: var(--text-secondary);
+    font-size: 0.9rem;
+}
+
+.dashboard-badge-stopped {
+    padding: 2px 8px;
+    border-radius: 10px;
+    font-size: 0.7rem;
+    font-weight: 600;
+    background: var(--border-color);
+    color: var(--text-secondary);
+    flex-shrink: 0;
+}
+
+.dashboard-badge-active {
+    padding: 2px 8px;
+    border-radius: 10px;
+    font-size: 0.7rem;
+    font-weight: 600;
+    background: var(--success-color, #28a745);
+    color: #fff;
+    flex-shrink: 0;
+}
+
+.dashboard-profile .dashboard-target-metrics {
+    min-width: 48px;
+}
+
+@media (max-width: 768px) {
+    .dashboard-target {
+        grid-template-columns: 1fr auto;
+        gap: 6px;
+    }
+
+    .dashboard-target-metrics {
+        display: none;
+    }
+}
+
+/* ===== PERFORMANCE CHARTS ===== */
+
+.perf-charts-grid {
+    display: grid;
+    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
+    gap: 12px;
+}
+
+.perf-chart-card {
+    background: var(--card-bg);
+    border: 1px solid var(--border-color);
+    border-radius: 6px;
+    padding: 10px 12px;
+}
+
+.perf-chart-wrap {
+    position: relative;
+    height: 60px;
+}
+
+.perf-chart-header {
+    display: flex;
+    justify-content: space-between;
+    align-items: center;
+    margin-bottom: 4px;
+}
+
+.perf-chart-label {
+    font-size: 0.75rem;
+    font-weight: 600;
+    text-transform: uppercase;
+    letter-spacing: 0.3px;
+    color: var(--text-secondary);
+}
+
+.perf-chart-value {
+    font-size: 0.85rem;
+    font-weight: 700;
+}
+
+.perf-chart-value.cpu { color: #2196F3; }
+.perf-chart-value.ram { color: #4CAF50; }
+.perf-chart-value.gpu { color: #FF9800; }
+
+.perf-chart-unavailable {
+    text-align: center;
+    padding: 20px 0;
+    color: var(--text-secondary);
+    font-size: 0.8rem;
+}
diff --git a/server/src/wled_controller/static/css/layout.css b/server/src/wled_controller/static/css/layout.css
new file mode 100644
index 0000000..bbfcbfb
--- /dev/null
+++ b/server/src/wled_controller/static/css/layout.css
@@ -0,0 +1,209 @@
+header {
+    display: flex;
+    justify-content: space-between;
+    align-items: center;
+    padding: 20px 0 10px;
+    margin-bottom: 10px;
+    position: relative;
+    z-index: 2100;
+}
+
+.header-title {
+    display: flex;
+    align-items: center;
+    gap: 10px;
+}
+
+h1 {
+    font-size: 2rem;
+    color: var(--primary-color);
+}
+
+h2 {
+    margin-bottom: 20px;
+    color: var(--text-color);
+    font-size: 1.5rem;
+}
+
+.server-info {
+    display: flex;
+    align-items: center;
+    gap: 15px;
+}
+
+.header-link {
+    color: var(--text-secondary);
+    text-decoration: none;
+    font-size: 0.85rem;
+    font-weight: 500;
+    padding: 4px 8px;
+    border-radius: 4px;
+    transition: color 0.2s, background 0.2s;
+}
+
+.header-link:hover {
+    color: var(--text-color);
+    background: var(--bg-secondary);
+}
+
+#server-version {
+    font-size: 0.75rem;
+    font-weight: 400;
+    color: var(--text-secondary);
+    background: var(--border-color);
+    padding: 2px 8px;
+    border-radius: 10px;
+    letter-spacing: 0.03em;
+}
+
+.status-badge {
+    font-size: 1.5rem;
+    animation: pulse 2s infinite;
+}
+
+.status-badge.online {
+    color: var(--primary-color);
+}
+
+.status-badge.offline {
+    color: var(--danger-color);
+}
+
+@keyframes pulse {
+    0%, 100% { opacity: 1; }
+    50% { opacity: 0.5; }
+}
+
+/* WLED device health indicator */
+.health-dot {
+    display: inline-block;
+    width: 10px;
+    height: 10px;
+    border-radius: 50%;
+    margin-right: 8px;
+    vertical-align: middle;
+    flex-shrink: 0;
+}
+
+.health-dot.health-online {
+    background-color: #4CAF50;
+    box-shadow: 0 0 6px rgba(76, 175, 80, 0.6);
+}
+
+.health-dot.health-offline {
+    background-color: var(--danger-color);
+    box-shadow: 0 0 6px rgba(244, 67, 54, 0.6);
+}
+
+.health-dot.health-unknown {
+    background-color: #9E9E9E;
+    animation: pulse 2s infinite;
+}
+
+.health-latency {
+    font-size: 0.7rem;
+    font-weight: 400;
+    color: #4CAF50;
+    margin-left: auto;
+    padding-left: 8px;
+    opacity: 0.85;
+}
+
+.health-latency.offline {
+    color: var(--danger-color);
+}
+
+/* Tabs */
+.tab-bar {
+    display: flex;
+    align-items: center;
+    gap: 4px;
+    border-bottom: 2px solid var(--border-color);
+    margin-bottom: 16px;
+}
+
+.tab-btn {
+    background: none;
+    border: none;
+    padding: 10px 18px;
+    font-size: 1rem;
+    font-weight: 500;
+    color: var(--text-secondary);
+    cursor: pointer;
+    border-bottom: 2px solid transparent;
+    margin-bottom: -2px;
+    transition: color 0.2s, border-color 0.2s;
+}
+
+.tab-btn:hover {
+    color: var(--text-color);
+}
+
+.tab-btn.active {
+    color: var(--primary-color);
+    border-bottom-color: var(--primary-color);
+}
+
+.tab-panel {
+    display: none;
+}
+
+.tab-panel.active {
+    display: block;
+}
+
+/* Theme Toggle */
+.theme-toggle {
+    background: var(--card-bg);
+    border: 1px solid var(--border-color);
+    padding: 6px 12px;
+    border-radius: 4px;
+    cursor: pointer;
+    font-size: 1.2rem;
+    transition: transform 0.2s;
+    margin-left: 10px;
+}
+
+.theme-toggle:hover {
+    transform: scale(1.1);
+}
+
+/* Footer */
+.app-footer {
+    margin-top: 20px;
+    padding: 15px 0;
+    text-align: center;
+}
+
+.footer-content {
+    color: var(--text-secondary);
+    font-size: 0.9rem;
+}
+
+.footer-content p {
+    margin: 0;
+}
+
+
+.footer-content strong {
+    color: var(--text-color);
+}
+
+.footer-content a {
+    color: var(--primary-color);
+    text-decoration: none;
+    transition: opacity 0.2s;
+}
+
+.footer-content a:hover {
+    opacity: 0.8;
+    text-decoration: underline;
+}
+
+@media (max-width: 768px) {
+    header {
+        flex-direction: column;
+        gap: 15px;
+        text-align: center;
+    }
+}
diff --git a/server/src/wled_controller/static/css/modal.css b/server/src/wled_controller/static/css/modal.css
new file mode 100644
index 0000000..5156752
--- /dev/null
+++ b/server/src/wled_controller/static/css/modal.css
@@ -0,0 +1,450 @@
+/* Modal Styles */
+.modal {
+    display: none;
+    position: fixed;
+    top: 0;
+    left: 0;
+    width: 100%;
+    height: 100%;
+    background: rgba(0, 0, 0, 0.8);
+    z-index: 2000;
+    align-items: center;
+    justify-content: center;
+    animation: fadeIn 0.2s ease-out;
+}
+
+@keyframes fadeIn {
+    from { opacity: 0; }
+    to { opacity: 1; }
+}
+
+.modal-content {
+    background: var(--card-bg);
+    border: 1px solid var(--border-color);
+    border-radius: 12px;
+    max-width: 500px;
+    width: 90%;
+    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.5);
+    animation: slideUp 0.3s ease-out;
+}
+
+#template-modal .modal-content {
+    max-width: 500px !important;
+    width: 100% !important;
+}
+
+#test-template-modal .modal-content {
+    max-width: 420px;
+}
+
+@keyframes slideUp {
+    from {
+        transform: translateY(20px);
+        opacity: 0;
+    }
+    to {
+        transform: translateY(0);
+        opacity: 1;
+    }
+}
+
+.modal-header {
+    padding: 24px 24px 16px 24px;
+    border-bottom: 1px solid var(--border-color);
+    display: flex;
+    align-items: center;
+    justify-content: space-between;
+}
+
+.modal-header h2 {
+    margin: 0;
+    font-size: 1.5rem;
+    color: var(--text-color);
+}
+
+.modal-header-actions {
+    display: flex;
+    align-items: center;
+    gap: 4px;
+}
+
+.modal-header-btn {
+    background: none;
+    border: none;
+    font-size: 1.1rem;
+    width: 32px;
+    height: 32px;
+    display: flex;
+    align-items: center;
+    justify-content: center;
+    cursor: pointer;
+    border-radius: 4px;
+    transition: background 0.2s;
+    flex-shrink: 0;
+}
+.modal-header-btn:hover {
+    background: rgba(128, 128, 128, 0.15);
+}
+.modal-header-btn:disabled {
+    opacity: 0.4;
+    cursor: default;
+}
+
+.modal-close-btn {
+    background: none;
+    border: none;
+    color: #777;
+    font-size: 1.2rem;
+    width: 32px;
+    height: 32px;
+    display: flex;
+    align-items: center;
+    justify-content: center;
+    cursor: pointer;
+    border-radius: 4px;
+    transition: color 0.2s, background 0.2s;
+    flex-shrink: 0;
+}
+
+.modal-close-btn:hover {
+    color: var(--text-color);
+    background: rgba(128, 128, 128, 0.15);
+}
+
+.modal-body {
+    padding: 24px;
+}
+
+.modal-description {
+    color: #999;
+    margin-bottom: 20px;
+    line-height: 1.6;
+}
+
+.password-input-wrapper {
+    position: relative;
+    display: flex;
+    align-items: center;
+}
+
+.password-input-wrapper input {
+    flex: 1;
+    padding-right: 45px;
+}
+
+.password-toggle {
+    position: absolute;
+    right: 8px;
+    background: none;
+    border: none;
+    cursor: pointer;
+    font-size: 1.2rem;
+    padding: 8px;
+    color: var(--text-color);
+    opacity: 0.6;
+    transition: opacity 0.2s;
+}
+
+.password-toggle:hover {
+    opacity: 1;
+}
+
+.label-row {
+    display: flex;
+    align-items: center;
+    gap: 6px;
+    margin-bottom: 5px;
+}
+
+.label-row label {
+    margin-bottom: 0;
+}
+
+.hint-toggle {
+    background: none;
+    border: 1px solid var(--border-color);
+    border-radius: 50%;
+    width: 18px;
+    height: 18px;
+    font-size: 0.7rem;
+    line-height: 1;
+    color: var(--text-secondary, #888);
+    cursor: pointer;
+    padding: 0;
+    display: inline-flex;
+    align-items: center;
+    justify-content: center;
+    opacity: 0.6;
+    transition: opacity 0.2s;
+    flex-shrink: 0;
+}
+
+.hint-toggle:hover {
+    opacity: 1;
+}
+
+.hint-toggle.active {
+    opacity: 1;
+    color: var(--primary-color, #4CAF50);
+    border-color: var(--primary-color, #4CAF50);
+}
+
+.input-hint {
+    display: block;
+    margin: 0 0 6px 0;
+    color: #666;
+    font-size: 0.85rem;
+}
+
+.fps-hint {
+    display: block;
+    margin-top: 4px;
+    font-size: 0.82rem;
+    color: var(--info-color, #2196F3);
+}
+
+.slider-row {
+    display: flex;
+    align-items: center;
+    gap: 12px;
+}
+
+.slider-row input[type="range"] {
+    flex: 1;
+}
+
+.slider-value {
+    min-width: 28px;
+    text-align: center;
+    font-weight: 600;
+    font-size: 0.95rem;
+    color: var(--text-primary);
+}
+
+.error-message {
+    background: rgba(244, 67, 54, 0.1);
+    border: 1px solid var(--danger-color);
+    color: var(--danger-color);
+    padding: 12px;
+    border-radius: 4px;
+    margin-top: 15px;
+    font-size: 0.9rem;
+}
+
+.modal-footer {
+    padding: 16px 24px 24px 24px;
+    display: flex;
+    justify-content: flex-end;
+    gap: 8px;
+}
+
+.modal-footer .btn-icon {
+    min-width: 60px;
+    padding: 10px 20px;
+    font-size: 1.4rem;
+}
+
+.btn-sm {
+    padding: 4px 10px;
+    font-size: 0.8rem;
+    min-width: auto;
+}
+
+.btn-display-picker {
+    width: 100%;
+    padding: 10px;
+    border: 1px solid var(--border-color);
+    border-radius: 4px;
+    background: var(--bg-color);
+    color: var(--text-color);
+    font-size: 1rem;
+    cursor: pointer;
+    text-align: left;
+    transition: border-color 0.2s, box-shadow 0.2s;
+    font-weight: 400;
+}
+
+.btn-display-picker:hover {
+    border-color: var(--primary-color);
+    box-shadow: 0 0 0 2px rgba(76, 175, 80, 0.15);
+}
+
+.modal-content-wide {
+    width: fit-content;
+    min-width: 500px;
+    max-width: calc(100vw - 40px);
+    max-height: calc(100vh - 40px);
+    display: flex;
+    flex-direction: column;
+}
+
+.modal-content-wide .modal-body {
+    overflow-y: auto;
+    scrollbar-gutter: stable;
+    flex: 1 1 auto;
+    min-height: 0;
+}
+
+@media (max-width: 768px) {
+    .modal-content {
+        width: 95%;
+        margin: 20px;
+    }
+
+    .modal-footer .btn {
+        min-width: 80px;
+    }
+}
+
+/* Image Lightbox */
+.lightbox {
+    display: none;
+    position: fixed;
+    top: 0;
+    left: 0;
+    width: 100%;
+    height: 100%;
+    background: rgba(0, 0, 0, 0.92);
+    z-index: 10000;
+    justify-content: center;
+    align-items: center;
+    cursor: zoom-out;
+}
+
+.lightbox.active {
+    display: flex;
+}
+
+.lightbox-content {
+    position: relative;
+    max-width: 95%;
+    max-height: 95%;
+    cursor: default;
+}
+
+.lightbox-content img {
+    max-width: 100%;
+    max-height: 90vh;
+    object-fit: contain;
+    border-radius: 4px;
+    display: block;
+}
+
+.lightbox-close {
+    position: absolute;
+    top: 16px;
+    right: 16px;
+    background: rgba(255, 255, 255, 0.15);
+    border: none;
+    color: white;
+    font-size: 1.5rem;
+    width: 40px;
+    height: 40px;
+    border-radius: 50%;
+    cursor: pointer;
+    display: flex;
+    align-items: center;
+    justify-content: center;
+    transition: background 0.2s;
+    z-index: 1;
+}
+
+.lightbox-close:hover {
+    background: rgba(255, 255, 255, 0.3);
+}
+
+.lightbox-refresh-btn {
+    position: absolute;
+    top: 16px;
+    right: 64px;
+    background: rgba(255, 255, 255, 0.15);
+    border: none;
+    color: white;
+    font-size: 1.2rem;
+    width: 40px;
+    height: 40px;
+    border-radius: 50%;
+    cursor: pointer;
+    display: flex;
+    align-items: center;
+    justify-content: center;
+    transition: background 0.2s;
+    z-index: 1;
+}
+
+.lightbox-refresh-btn:hover {
+    background: rgba(255, 255, 255, 0.3);
+}
+
+.lightbox-refresh-btn.active {
+    background: var(--primary-color);
+}
+
+.lightbox-stats {
+    position: absolute;
+    bottom: 8px;
+    left: 8px;
+    background: rgba(0, 0, 0, 0.7);
+    backdrop-filter: blur(8px);
+    color: white;
+    padding: 8px 14px;
+    border-radius: 6px;
+    font-size: 0.8rem;
+    display: flex;
+    gap: 16px;
+    flex-wrap: wrap;
+}
+
+.lightbox-stats .stat-item {
+    display: flex;
+    gap: 4px;
+    align-items: center;
+}
+
+.lightbox-stats .stat-item span {
+    opacity: 0.7;
+}
+
+.lightbox-stats .stat-item strong {
+    font-weight: 600;
+}
+
+/* Display Picker Lightbox */
+.display-picker-content {
+    max-width: 900px;
+    width: 90%;
+    text-align: center;
+}
+
+.display-picker-title {
+    color: white;
+    font-size: 1.3rem;
+    margin-bottom: 20px;
+    font-weight: 500;
+}
+
+.display-picker-canvas {
+    background: rgba(255, 255, 255, 0.05);
+    border: 2px dashed rgba(255, 255, 255, 0.15);
+    border-radius: 8px;
+    padding: 24px;
+    width: 100%;
+    box-sizing: border-box;
+}
+
+.layout-display-pickable {
+    cursor: pointer !important;
+    border: 2px solid var(--border-color) !important;
+    background: linear-gradient(135deg, rgba(128, 128, 128, 0.08), rgba(128, 128, 128, 0.03)) !important;
+}
+
+.layout-display-pickable:hover {
+    box-shadow: 0 0 20px rgba(76, 175, 80, 0.4);
+    border-color: var(--primary-color) !important;
+}
+
+.layout-display-pickable.selected {
+    border-color: var(--primary-color) !important;
+    box-shadow: 0 0 16px rgba(76, 175, 80, 0.5);
+    background: rgba(76, 175, 80, 0.12) !important;
+}
diff --git a/server/src/wled_controller/static/css/patterns.css b/server/src/wled_controller/static/css/patterns.css
new file mode 100644
index 0000000..7ddbb5a
--- /dev/null
+++ b/server/src/wled_controller/static/css/patterns.css
@@ -0,0 +1,337 @@
+/* Static image stream styles */
+.image-preview-container {
+    text-align: center;
+    margin: 12px 0;
+    padding: 12px;
+    background: var(--bg-secondary);
+    border-radius: 8px;
+    border: 1px solid var(--border-color);
+}
+.stream-image-preview {
+    max-width: 100%;
+    max-height: 200px;
+    border-radius: 4px;
+    border: 1px solid var(--border-color);
+}
+.stream-image-info {
+    font-size: 0.75rem;
+    color: var(--text-muted);
+    margin-top: 6px;
+}
+.validation-status {
+    font-size: 0.8rem;
+    margin-top: 4px;
+    padding: 4px 8px;
+    border-radius: 4px;
+}
+.validation-status.success {
+    color: #4caf50;
+}
+.validation-status.error {
+    color: #f44336;
+}
+.validation-status.loading {
+    color: var(--text-muted);
+}
+.stream-card-props {
+    display: flex;
+    flex-wrap: wrap;
+    gap: 6px;
+    margin-bottom: 8px;
+}
+
+.stream-card-prop {
+    display: inline-block;
+    font-size: 0.75rem;
+    color: var(--text-secondary);
+    background: var(--border-color);
+    padding: 2px 8px;
+    border-radius: 10px;
+    white-space: nowrap;
+    overflow: hidden;
+    text-overflow: ellipsis;
+    max-width: 180px;
+    vertical-align: middle;
+}
+
+.stream-card-prop-full {
+    max-width: 100%;
+    word-break: break-all;
+    white-space: normal;
+    font-size: 0.7rem;
+}
+
+/* Key Colors target styles */
+.kc-rect-list {
+    display: flex;
+    flex-direction: column;
+    gap: 8px;
+    margin-bottom: 8px;
+}
+
+.kc-rect-row {
+    display: flex;
+    align-items: center;
+    gap: 6px;
+    padding: 8px;
+    background: var(--bg-color);
+    border: 1px solid var(--border-color);
+    border-radius: 6px;
+}
+
+.kc-rect-row input[type="text"] {
+    flex: 2;
+    min-width: 0;
+}
+
+.kc-rect-row input[type="number"] {
+    flex: 1;
+    min-width: 0;
+    width: 60px;
+}
+
+.kc-rect-row .kc-rect-remove-btn {
+    background: none;
+    border: none;
+    color: #777;
+    font-size: 1rem;
+    cursor: pointer;
+    padding: 4px;
+    border-radius: 4px;
+    flex-shrink: 0;
+    transition: color 0.2s, background 0.2s;
+}
+
+.kc-rect-row .kc-rect-remove-btn:hover {
+    color: var(--danger-color);
+    background: rgba(244, 67, 54, 0.1);
+}
+
+.kc-rect-labels {
+    display: flex;
+    gap: 6px;
+    padding: 0 8px;
+    margin-bottom: 4px;
+    font-size: 0.7rem;
+    color: var(--text-secondary);
+    font-weight: 600;
+}
+
+.kc-rect-labels span:first-child {
+    flex: 2;
+}
+
+.kc-rect-labels span {
+    flex: 1;
+    text-align: center;
+}
+
+.kc-rect-labels span:last-child {
+    width: 28px;
+    flex: 0 0 28px;
+}
+
+.kc-add-rect-btn {
+    width: 100%;
+    font-size: 0.85rem;
+    padding: 6px 12px;
+}
+
+.kc-rect-empty {
+    text-align: center;
+    color: var(--text-secondary);
+    font-size: 0.85rem;
+    padding: 12px;
+    font-style: italic;
+}
+
+.kc-color-swatches {
+    display: flex;
+    flex-wrap: wrap;
+    gap: 6px;
+    margin-bottom: 8px;
+}
+
+.kc-swatch {
+    display: flex;
+    flex-direction: column;
+    align-items: center;
+    gap: 3px;
+}
+
+.kc-swatch-color {
+    width: 32px;
+    height: 32px;
+    border-radius: 6px;
+    border: 2px solid var(--border-color);
+    transition: background-color 0.3s;
+}
+
+.kc-swatch-label {
+    font-size: 0.6rem;
+    color: var(--text-secondary);
+    max-width: 40px;
+    overflow: hidden;
+    text-overflow: ellipsis;
+    white-space: nowrap;
+    text-align: center;
+}
+
+.kc-no-colors {
+    color: var(--text-secondary);
+    font-size: 0.8rem;
+    font-style: italic;
+    padding: 4px 0;
+}
+
+/* Pattern Template Visual Editor */
+.pattern-canvas-container {
+    position: relative;
+    border-radius: 8px;
+    overflow: hidden;
+    background: var(--bg-color);
+    border: 1px solid var(--border-color);
+    margin-bottom: 12px;
+    resize: both;
+    width: 820px;
+    min-width: 400px;
+    max-width: 100%;
+    min-height: 200px;
+    height: 450px;
+    max-height: calc(100vh - 400px);
+}
+
+#pattern-canvas {
+    width: 100%;
+    height: 100%;
+    display: block;
+    cursor: default;
+}
+
+.pattern-canvas-toolbar {
+    display: flex;
+    gap: 2px;
+    padding: 4px;
+    align-items: center;
+    background: var(--bg-secondary);
+    border-radius: 6px;
+    margin-top: 4px;
+}
+
+.pattern-canvas-toolbar .btn {
+    flex: 0 0 auto;
+    min-width: 32px;
+    width: 32px;
+    height: 32px;
+    padding: 0;
+    font-size: 1rem;
+    display: flex;
+    align-items: center;
+    justify-content: center;
+    border-radius: 4px;
+}
+
+.pattern-bg-row {
+    display: flex;
+    gap: 0.5rem;
+    align-items: center;
+    margin-bottom: 8px;
+}
+
+.pattern-bg-row select {
+    flex: 1;
+}
+
+.pattern-capture-btn {
+    flex: 0 0 auto;
+    min-width: 36px !important;
+    width: 36px;
+    height: 36px;
+    padding: 0 !important;
+    font-size: 1.1rem;
+    line-height: 36px;
+    text-align: center;
+}
+
+.pattern-rect-list {
+    display: flex;
+    flex-direction: column;
+    gap: 6px;
+    margin-top: 8px;
+    max-height: 200px;
+    overflow-y: auto;
+}
+
+.pattern-rect-row {
+    display: flex;
+    align-items: center;
+    gap: 6px;
+    padding: 6px 8px;
+    background: var(--bg-color);
+    border: 1px solid var(--border-color);
+    border-radius: 6px;
+    font-size: 0.85rem;
+    cursor: pointer;
+    transition: border-color 0.15s;
+}
+
+.pattern-rect-row.selected {
+    border-color: var(--primary-color);
+    background: rgba(76, 175, 80, 0.08);
+}
+
+.pattern-rect-row input[type="text"] {
+    flex: 2;
+    min-width: 0;
+    padding: 4px 6px;
+    font-size: 0.8rem;
+}
+
+.pattern-rect-row input[type="number"] {
+    flex: 1;
+    min-width: 0;
+    width: 55px;
+    padding: 4px 6px;
+    font-size: 0.8rem;
+}
+
+.pattern-rect-row .pattern-rect-remove-btn {
+    background: none;
+    border: none;
+    color: #777;
+    font-size: 0.9rem;
+    cursor: pointer;
+    padding: 2px 4px;
+    border-radius: 4px;
+    flex-shrink: 0;
+    transition: color 0.2s, background 0.2s;
+}
+
+.pattern-rect-row .pattern-rect-remove-btn:hover {
+    color: var(--danger-color);
+    background: rgba(244, 67, 54, 0.1);
+}
+
+.pattern-rect-labels {
+    display: flex;
+    gap: 6px;
+    padding: 0 8px;
+    margin-bottom: 2px;
+    font-size: 0.7rem;
+    color: var(--text-secondary);
+    font-weight: 600;
+}
+
+.pattern-rect-labels span:first-child {
+    flex: 2;
+}
+
+.pattern-rect-labels span {
+    flex: 1;
+    text-align: center;
+}
+
+.pattern-rect-labels span:last-child {
+    width: 24px;
+    flex: 0 0 24px;
+}
diff --git a/server/src/wled_controller/static/css/profiles.css b/server/src/wled_controller/static/css/profiles.css
new file mode 100644
index 0000000..491d190
--- /dev/null
+++ b/server/src/wled_controller/static/css/profiles.css
@@ -0,0 +1,185 @@
+/* ===== PROFILES ===== */
+
+.badge-profile-active {
+    background: var(--success-color, #28a745);
+    color: #fff;
+}
+
+.badge-profile-inactive {
+    background: var(--border-color);
+    color: var(--text-color);
+}
+
+.badge-profile-disabled {
+    background: var(--border-color);
+    color: var(--text-muted);
+    opacity: 0.7;
+}
+
+.profile-status-disabled {
+    opacity: 0.6;
+}
+
+.profile-logic-label {
+    font-size: 0.7rem;
+    font-weight: 600;
+    color: var(--text-muted);
+    padding: 0 4px;
+}
+
+/* Profile condition editor rows */
+.profile-condition-row {
+    border: 1px solid var(--border-color);
+    border-radius: 6px;
+    padding: 10px;
+    margin-bottom: 8px;
+    background: var(--bg-secondary, var(--bg-color));
+}
+
+.condition-header {
+    display: flex;
+    justify-content: space-between;
+    align-items: center;
+    margin-bottom: 8px;
+}
+
+.condition-type-label {
+    font-weight: 600;
+    font-size: 0.9rem;
+}
+
+.btn-remove-condition {
+    background: none;
+    border: none;
+    color: var(--danger-color, #dc3545);
+    cursor: pointer;
+    font-size: 1rem;
+    padding: 2px 6px;
+}
+
+.condition-fields {
+    display: flex;
+    flex-direction: column;
+    gap: 8px;
+}
+
+.condition-field label {
+    display: block;
+    font-size: 0.85rem;
+    margin-bottom: 3px;
+    color: var(--text-muted);
+}
+
+.condition-field select,
+.condition-field textarea {
+    width: 100%;
+    padding: 6px 8px;
+    border: 1px solid var(--border-color);
+    border-radius: 4px;
+    background: var(--bg-color);
+    color: var(--text-color);
+    font-size: 0.9rem;
+    font-family: inherit;
+}
+
+.condition-apps {
+    resize: vertical;
+    min-height: 60px;
+}
+
+.condition-apps-header {
+    display: flex;
+    justify-content: space-between;
+    align-items: center;
+}
+
+.btn-browse-apps {
+    background: none;
+    border: 1px solid var(--border-color);
+    color: var(--text-color);
+    font-size: 0.75rem;
+    padding: 2px 8px;
+    border-radius: 4px;
+    cursor: pointer;
+    transition: border-color 0.2s, background 0.2s;
+}
+
+.btn-browse-apps:hover {
+    border-color: var(--primary-color);
+    background: rgba(33, 150, 243, 0.1);
+}
+
+.process-picker {
+    margin-top: 6px;
+    border: 1px solid var(--border-color);
+    border-radius: 4px;
+    overflow: hidden;
+}
+
+.process-picker-search {
+    width: 100%;
+    padding: 6px 8px;
+    border: none;
+    border-bottom: 1px solid var(--border-color);
+    background: var(--bg-color);
+    color: var(--text-color);
+    font-size: 0.85rem;
+    font-family: inherit;
+    outline: none;
+    box-sizing: border-box;
+}
+
+.process-picker-list {
+    max-height: 160px;
+    overflow-y: auto;
+}
+
+.process-picker-item {
+    padding: 4px 8px;
+    font-size: 0.8rem;
+    cursor: pointer;
+    transition: background 0.1s;
+}
+
+.process-picker-item:hover {
+    background: rgba(33, 150, 243, 0.15);
+}
+
+.process-picker-item.added {
+    color: var(--text-muted);
+    cursor: default;
+    opacity: 0.6;
+}
+
+.process-picker-loading {
+    padding: 8px;
+    font-size: 0.8rem;
+    color: var(--text-muted);
+    text-align: center;
+}
+
+/* Profile target checklist */
+.profile-targets-checklist {
+    max-height: 200px;
+    overflow-y: auto;
+    border: 1px solid var(--border-color);
+    border-radius: 4px;
+    padding: 6px;
+}
+
+.profile-target-item {
+    display: flex;
+    align-items: center;
+    gap: 8px;
+    padding: 4px 6px;
+    cursor: pointer;
+    border-radius: 3px;
+}
+
+.profile-target-item:hover {
+    background: var(--bg-secondary, var(--bg-color));
+}
+
+.profile-target-item input[type="checkbox"] {
+    margin: 0;
+}
diff --git a/server/src/wled_controller/static/css/streams.css b/server/src/wled_controller/static/css/streams.css
new file mode 100644
index 0000000..7b90a32
--- /dev/null
+++ b/server/src/wled_controller/static/css/streams.css
@@ -0,0 +1,611 @@
+/* ===========================
+   Capture Templates Styles
+   =========================== */
+
+.templates-grid {
+    display: grid;
+    grid-template-columns: repeat(auto-fill, minmax(350px, 1fr));
+    gap: 20px;
+}
+
+.template-card {
+    background: var(--card-bg);
+    border: 1px solid var(--border-color);
+    border-radius: 8px;
+    padding: 16px;
+    transition: box-shadow 0.2s;
+    display: flex;
+    flex-direction: column;
+    position: relative;
+}
+
+.template-card:hover {
+    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
+}
+
+.add-template-card {
+    display: flex;
+    flex-direction: column;
+    align-items: center;
+    justify-content: center;
+    min-height: 180px;
+    cursor: pointer;
+    border: 2px dashed var(--border-color);
+    background: transparent;
+    transition: border-color 0.2s, background 0.2s;
+}
+
+.add-template-card:hover {
+    border-color: var(--primary-color);
+    background: rgba(33, 150, 243, 0.05);
+    box-shadow: none;
+}
+
+.add-template-icon {
+    font-size: 2.5rem;
+    font-weight: 300;
+    color: var(--text-secondary);
+    line-height: 1;
+    transition: color 0.2s;
+}
+
+.add-template-card:hover .add-template-icon {
+    color: var(--primary-color);
+}
+
+.add-template-label {
+    font-size: 0.85rem;
+    color: var(--text-secondary);
+    margin-top: 8px;
+    font-weight: 500;
+}
+
+.template-card-header {
+    display: flex;
+    justify-content: space-between;
+    align-items: center;
+    margin-bottom: 12px;
+}
+
+.template-card .template-card-header {
+    padding-right: 24px;
+}
+
+.template-name {
+    font-size: 18px;
+    font-weight: bold;
+    color: var(--text-color);
+}
+
+.badge {
+    padding: 4px 8px;
+    border-radius: 4px;
+    font-size: 12px;
+    font-weight: bold;
+    text-transform: uppercase;
+}
+
+.template-description {
+    color: var(--text-secondary);
+    font-size: 14px;
+    margin-bottom: 12px;
+    line-height: 1.4;
+}
+
+.template-config {
+    font-size: 14px;
+    color: var(--text-secondary);
+    margin-bottom: 8px;
+}
+
+.filter-chain {
+    display: flex;
+    align-items: center;
+    flex-wrap: wrap;
+    gap: 4px;
+    margin-bottom: 8px;
+}
+
+.filter-chain-item {
+    font-size: 0.7rem;
+    background: var(--border-color);
+    color: var(--text-secondary);
+    padding: 2px 8px;
+    border-radius: 10px;
+}
+
+.filter-chain-arrow {
+    font-size: 0.7rem;
+    color: var(--text-muted);
+}
+
+.template-config-details {
+    margin: 12px 0;
+    font-size: 13px;
+}
+
+.template-config-details summary {
+    cursor: pointer;
+    color: var(--primary-color);
+    font-weight: 500;
+    padding: 4px 0;
+}
+
+.template-config-details summary:hover {
+    text-decoration: underline;
+}
+
+.template-no-config {
+    margin: 12px 0;
+    font-size: 13px;
+    color: var(--primary-color);
+    font-weight: 500;
+    padding: 4px 0;
+}
+
+.config-table {
+    width: 100%;
+    margin-top: 8px;
+    border-collapse: collapse;
+    font-size: 13px;
+}
+
+.config-table td {
+    padding: 4px 8px;
+    border-bottom: 1px solid var(--border-color);
+}
+
+.config-table tr:last-child td {
+    border-bottom: none;
+}
+
+.config-key {
+    color: var(--text-secondary);
+    white-space: nowrap;
+    width: 1%;
+}
+
+.config-value {
+    color: var(--text-primary);
+    font-family: monospace;
+}
+
+/* Engine config grid (property name left, input right) */
+.config-grid {
+    display: grid;
+    grid-template-columns: auto 1fr;
+    gap: 8px 12px;
+    align-items: center;
+    margin-top: 12px;
+}
+
+.config-grid-label {
+    font-size: 0.85rem;
+    color: var(--text-secondary);
+    white-space: nowrap;
+    text-align: right;
+}
+
+.config-grid-value input,
+.config-grid-value select {
+    width: 100%;
+    padding: 6px 10px;
+    border: 1px solid var(--border-color);
+    border-radius: 4px;
+    background: var(--bg-color);
+    color: var(--text-color);
+    font-size: 0.85rem;
+}
+
+.template-card-actions {
+    display: flex;
+    gap: 8px;
+    margin-top: auto;
+    padding-top: 12px;
+    border-top: 1px solid var(--border-color);
+    align-items: center;
+}
+
+.template-card-actions .btn:not(.btn-icon) {
+    flex: 1;
+}
+
+.template-card-actions .btn-icon {
+    flex-shrink: 0;
+}
+
+.text-muted {
+    color: var(--text-secondary);
+    font-style: italic;
+    font-size: 13px;
+}
+
+/* PP Filter List in Template Modal */
+.pp-filter-list {
+    display: flex;
+    flex-direction: column;
+    gap: 8px;
+    margin-bottom: 12px;
+}
+
+.pp-filter-empty {
+    color: var(--text-secondary);
+    font-size: 13px;
+    text-align: center;
+    padding: 16px;
+    border: 1px dashed var(--border-color);
+    border-radius: 8px;
+}
+
+.pp-filter-card {
+    border: 1px solid var(--border-color);
+    border-radius: 8px;
+    background: var(--bg-secondary);
+    padding: 10px 12px;
+}
+
+.pp-filter-card-header {
+    display: flex;
+    align-items: center;
+    gap: 6px;
+    cursor: pointer;
+    user-select: none;
+}
+
+.pp-filter-card.expanded .pp-filter-card-header {
+    margin-bottom: 8px;
+}
+
+.pp-filter-card-chevron {
+    font-size: 10px;
+    color: var(--text-secondary);
+    flex-shrink: 0;
+    width: 12px;
+}
+
+.pp-filter-card-name {
+    font-weight: 600;
+    font-size: 14px;
+    color: var(--text-primary);
+}
+
+.pp-filter-card-summary {
+    color: var(--text-secondary);
+    font-size: 12px;
+    margin-right: 8px;
+    white-space: nowrap;
+    overflow: hidden;
+    text-overflow: ellipsis;
+}
+
+.pp-filter-card-actions {
+    display: flex;
+    gap: 4px;
+    flex-shrink: 0;
+    margin-left: auto;
+}
+
+.btn-filter-action {
+    background: none;
+    border: 1px solid var(--border-color);
+    border-radius: 4px;
+    color: var(--text-secondary);
+    cursor: pointer;
+    width: 26px;
+    height: 26px;
+    display: flex;
+    align-items: center;
+    justify-content: center;
+    font-size: 11px;
+    padding: 0;
+}
+
+.btn-filter-action:hover:not(:disabled) {
+    background: var(--border-color);
+    color: var(--text-primary);
+}
+
+.btn-filter-action:disabled {
+    opacity: 0.3;
+    cursor: not-allowed;
+}
+
+.btn-filter-remove:hover:not(:disabled) {
+    background: rgba(239, 68, 68, 0.15);
+    border-color: rgba(239, 68, 68, 0.4);
+    color: #ef4444;
+}
+
+.pp-filter-card-options {
+    display: flex;
+    flex-direction: column;
+    gap: 4px;
+}
+
+.pp-filter-option {
+    display: flex;
+    flex-direction: column;
+    gap: 2px;
+}
+
+.pp-filter-option label {
+    display: flex;
+    justify-content: space-between;
+    font-size: 12px;
+    color: var(--text-secondary);
+}
+
+.pp-filter-option input[type="range"] {
+    width: 100%;
+}
+
+.pp-filter-option-bool label {
+    justify-content: space-between;
+    gap: 8px;
+    align-items: center;
+    cursor: pointer;
+    padding: 4px 0;
+}
+
+.pp-filter-option-bool input[type="checkbox"] {
+    appearance: none;
+    -webkit-appearance: none;
+    width: 34px;
+    min-width: 34px;
+    height: 18px;
+    background: var(--border-color);
+    border-radius: 9px;
+    position: relative;
+    cursor: pointer;
+    transition: background 0.2s;
+    order: 1;
+    margin: 0;
+}
+
+.pp-filter-option-bool input[type="checkbox"]::after {
+    content: '';
+    position: absolute;
+    top: 2px;
+    left: 2px;
+    width: 14px;
+    height: 14px;
+    background: white;
+    border-radius: 50%;
+    transition: transform 0.2s;
+}
+
+.pp-filter-option-bool input[type="checkbox"]:checked {
+    background: var(--primary-color);
+}
+
+.pp-filter-option-bool input[type="checkbox"]:checked::after {
+    transform: translateX(16px);
+}
+
+.pp-filter-option-bool span {
+    order: 0;
+}
+
+.pp-add-filter-row {
+    display: flex;
+    gap: 8px;
+    align-items: center;
+    margin-bottom: 4px;
+}
+
+.pp-add-filter-select {
+    flex: 1;
+    padding: 6px 10px;
+    border: 1px solid var(--border-color);
+    border-radius: 6px;
+    background: var(--card-bg);
+    color: var(--text-primary);
+    font-size: 13px;
+}
+
+.pp-add-filter-btn {
+    width: 34px;
+    height: 34px;
+    flex-shrink: 0;
+    display: flex;
+    align-items: center;
+    justify-content: center;
+    border: 1px solid var(--border-color);
+    border-radius: 6px;
+    background: var(--card-bg);
+    color: var(--text-primary);
+    font-size: 20px;
+    cursor: pointer;
+    padding: 0;
+    line-height: 1;
+}
+
+.pp-add-filter-btn:hover {
+    background: var(--border-color);
+}
+
+/* Template Test Section */
+.template-test-section {
+    background: var(--bg-secondary);
+    border-radius: 8px;
+    padding: 16px;
+}
+
+.template-test-section h3 {
+    margin-top: 0;
+    margin-bottom: 12px;
+    font-size: 16px;
+}
+
+.test-results-container {
+    background: var(--card-bg);
+    border: 1px solid var(--border-color);
+    border-radius: 8px;
+    padding: 16px;
+}
+
+.test-preview-section,
+.test-performance-section {
+    margin-bottom: 20px;
+}
+
+.test-preview-section:last-child,
+.test-performance-section:last-child {
+    margin-bottom: 0;
+}
+
+.test-preview-section h4,
+.test-performance-section h4 {
+    margin-top: 0;
+    margin-bottom: 12px;
+    font-size: 14px;
+    font-weight: 600;
+    color: var(--text-secondary);
+}
+
+.test-preview-image {
+    border-radius: 4px;
+    overflow: hidden;
+    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
+}
+
+.test-preview-image img {
+    display: block;
+    width: 100%;
+    height: auto;
+}
+
+.test-performance-stats {
+    display: flex;
+    flex-direction: column;
+    gap: 8px;
+}
+
+.stat-item {
+    display: flex;
+    justify-content: space-between;
+    align-items: center;
+    padding: 10px 0;
+    border-bottom: 1px solid var(--border-color);
+    font-size: 14px;
+}
+
+.stat-item:last-child {
+    border-bottom: none;
+}
+
+.stat-item span {
+    color: var(--text-secondary);
+    font-weight: 500;
+}
+
+.stat-item strong {
+    color: var(--text-color);
+    font-weight: 600;
+    font-family: monospace;
+}
+
+/* Empty state */
+.empty-state {
+    text-align: center;
+    padding: 40px 20px;
+    color: var(--text-secondary);
+    font-size: 16px;
+}
+
+/* Stream type badges */
+.badge-raw {
+    background: #1976d2;
+    color: white;
+}
+
+.badge-processed {
+    background: #7b1fa2;
+    color: white;
+}
+
+/* Stream info panel in stream selector modal */
+.stream-info-panel {
+    padding: 4px 0 0 0;
+    font-size: 14px;
+    line-height: 1.6;
+}
+
+/* Stream sub-tabs */
+.stream-tab-bar {
+    display: flex;
+    align-items: center;
+    gap: 4px;
+    border-bottom: 2px solid var(--border-color);
+    margin-bottom: 16px;
+}
+
+.stream-tab-btn {
+    background: none;
+    border: none;
+    padding: 8px 14px;
+    font-size: 0.9rem;
+    font-weight: 500;
+    color: var(--text-secondary);
+    cursor: pointer;
+    border-bottom: 2px solid transparent;
+    margin-bottom: -2px;
+    transition: color 0.2s, border-color 0.2s;
+}
+
+.stream-tab-btn:hover {
+    color: var(--text-color);
+}
+
+.stream-tab-btn.active {
+    color: var(--primary-color);
+    border-bottom-color: var(--primary-color);
+}
+
+.stream-tab-count {
+    background: var(--border-color);
+    color: var(--text-secondary);
+    font-size: 0.7rem;
+    font-weight: 600;
+    padding: 1px 6px;
+    border-radius: 8px;
+    margin-left: 4px;
+}
+
+.stream-tab-btn.active .stream-tab-count {
+    background: var(--primary-color);
+    color: #fff;
+}
+
+.stream-tab-panel {
+    display: none;
+}
+
+.stream-tab-panel.active {
+    display: block;
+}
+
+/* Sub-tab content sections */
+.subtab-section {
+    margin-bottom: 24px;
+}
+
+.subtab-section:last-child {
+    margin-bottom: 0;
+}
+
+.subtab-section-header {
+    font-size: 1rem;
+    font-weight: 600;
+    color: var(--text-secondary);
+    margin: 0 0 12px 0;
+    padding-bottom: 8px;
+    border-bottom: 1px solid var(--border-color);
+}
+
+/* Responsive adjustments */
+@media (max-width: 768px) {
+    .templates-grid {
+        grid-template-columns: 1fr;
+    }
+}
diff --git a/server/src/wled_controller/static/css/tutorials.css b/server/src/wled_controller/static/css/tutorials.css
new file mode 100644
index 0000000..a22db99
--- /dev/null
+++ b/server/src/wled_controller/static/css/tutorials.css
@@ -0,0 +1,197 @@
+/* Tutorial System */
+.tutorial-trigger-btn {
+    width: 28px;
+    height: 28px;
+    border-radius: 50%;
+    border: 2px solid var(--primary-color);
+    background: transparent;
+    color: var(--primary-color);
+    font-size: 1rem;
+    font-weight: bold;
+    cursor: pointer;
+    transition: all 0.2s;
+    display: flex;
+    align-items: center;
+    justify-content: center;
+    margin-left: auto;
+    margin-right: 8px;
+    flex-shrink: 0;
+}
+
+.tutorial-trigger-btn:hover {
+    background: var(--primary-color);
+    color: white;
+}
+
+#calibration-modal .modal-body {
+    position: relative;
+}
+
+.tutorial-overlay {
+    display: none;
+    position: absolute;
+    top: 0;
+    left: 0;
+    right: 0;
+    bottom: 0;
+    z-index: 100;
+    pointer-events: none;
+}
+
+.tutorial-overlay.active {
+    display: block;
+    pointer-events: auto;
+}
+
+.tutorial-backdrop {
+    position: absolute;
+    top: 0;
+    left: 0;
+    width: 100%;
+    height: 100%;
+    background: rgba(0, 0, 0, 0.7);
+    transition: clip-path 0.3s ease;
+}
+
+.tutorial-ring {
+    position: absolute;
+    border: 2px solid var(--primary-color);
+    border-radius: 6px;
+    pointer-events: none;
+    transition: all 0.3s ease;
+    animation: tutorial-pulse 2s infinite;
+}
+
+@keyframes tutorial-pulse {
+    0%, 100% { box-shadow: 0 0 0 0 rgba(76, 175, 80, 0.6); }
+    50% { box-shadow: 0 0 0 6px rgba(76, 175, 80, 0); }
+}
+
+.tutorial-tooltip {
+    position: absolute;
+    width: 260px;
+    background: var(--card-bg);
+    border: 2px solid var(--primary-color);
+    border-radius: 8px;
+    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.5);
+    z-index: 102;
+    pointer-events: auto;
+    animation: tutorial-tooltip-in 0.25s ease-out;
+}
+
+@keyframes tutorial-tooltip-in {
+    from { opacity: 0; transform: translateY(-8px); }
+    to { opacity: 1; transform: translateY(0); }
+}
+
+.tutorial-tooltip-header {
+    display: flex;
+    justify-content: space-between;
+    align-items: center;
+    padding: 8px 12px;
+    border-bottom: 1px solid var(--border-color);
+}
+
+.tutorial-step-counter {
+    font-size: 0.8rem;
+    font-weight: 600;
+    color: var(--primary-color);
+}
+
+.tutorial-close-btn {
+    background: none;
+    border: none;
+    color: #777;
+    font-size: 1.3rem;
+    width: 24px;
+    height: 24px;
+    display: flex;
+    align-items: center;
+    justify-content: center;
+    cursor: pointer;
+    border-radius: 4px;
+    transition: color 0.2s, background 0.2s;
+    padding: 0;
+    line-height: 1;
+}
+
+.tutorial-close-btn:hover {
+    color: var(--text-color);
+    background: rgba(128, 128, 128, 0.15);
+}
+
+.tutorial-tooltip-text {
+    margin: 0;
+    padding: 12px;
+    line-height: 1.5;
+    color: var(--text-color);
+    font-size: 0.9rem;
+}
+
+.tutorial-tooltip-nav {
+    display: flex;
+    gap: 6px;
+    padding: 8px 12px;
+    border-top: 1px solid var(--border-color);
+}
+
+.tutorial-prev-btn,
+.tutorial-next-btn {
+    flex: 1;
+    padding: 6px;
+    border: none;
+    border-radius: 4px;
+    cursor: pointer;
+    font-size: 1rem;
+    font-weight: 600;
+    transition: opacity 0.2s;
+}
+
+.tutorial-prev-btn {
+    background: var(--border-color);
+    color: var(--text-color);
+}
+
+.tutorial-next-btn {
+    background: var(--primary-color);
+    color: white;
+}
+
+.tutorial-prev-btn:hover:not(:disabled),
+.tutorial-next-btn:hover:not(:disabled) {
+    opacity: 0.85;
+}
+
+.tutorial-prev-btn:disabled,
+.tutorial-next-btn:disabled {
+    opacity: 0.3;
+    cursor: not-allowed;
+}
+
+.tutorial-target {
+    position: relative;
+    z-index: 101 !important;
+}
+
+/* Fixed (viewport-level) tutorial overlay for device cards */
+.tutorial-overlay-fixed {
+    position: fixed;
+    z-index: 10000;
+}
+
+.tutorial-overlay-fixed .tutorial-backdrop {
+    position: fixed;
+}
+
+.tutorial-overlay-fixed .tutorial-ring {
+    position: fixed;
+}
+
+.tutorial-overlay-fixed .tutorial-tooltip {
+    position: absolute;
+    z-index: 10002;
+    animation: none;
+    opacity: 1;
+}
+
+/* target z-index for fixed overlay is set inline via JS (target is outside overlay DOM) */
diff --git a/server/src/wled_controller/static/index.html b/server/src/wled_controller/static/index.html
deleted file mode 100644
index 2b6284d..0000000
--- a/server/src/wled_controller/static/index.html
+++ /dev/null
@@ -1,1259 +0,0 @@
-<!DOCTYPE html>
-<html lang="en">
-<head>
-    <meta charset="UTF-8">
-    <meta name="viewport" content="width=device-width, initial-scale=1.0">
-    <title>LED Grab</title>
-    <link rel="icon" href="data:image/svg+xml,<svg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 100 100'><text y='0.9em' font-size='90'>💡</text></svg>">
-    <link rel="stylesheet" href="/static/style.css">
-    <script src="https://cdn.jsdelivr.net/npm/chart.js@4/dist/chart.umd.min.js"></script>
-</head>
-<body style="visibility: hidden;">
-    <div class="container">
-        <header>
-            <div class="header-title">
-                <span id="server-status" class="status-badge">●</span>
-                <h1 data-i18n="app.title">LED Grab</h1>
-                <span id="server-version"><span id="version-number"></span></span>
-            </div>
-            <div class="server-info">
-                <a href="/docs" target="_blank" class="header-link" data-i18n-title="app.api_docs" title="API Docs">API</a>
-                <button class="theme-toggle" onclick="toggleTheme()" data-i18n-title="theme.toggle" title="Toggle theme">
-                    <span id="theme-icon">🌙</span>
-                </button>
-                <select id="locale-select" onchange="changeLocale()" data-i18n-title="locale.change" title="Change language" style="margin-left: 10px; padding: 6px 12px; border: 1px solid var(--border-color); border-radius: 4px; background: var(--bg-color); color: var(--text-color); font-size: 0.9rem; cursor: pointer;">
-                    <option value="en">English</option>
-                    <option value="ru">Русский</option>
-                </select>
-                <button id="login-btn" class="btn btn-primary" onclick="showLogin()" style="display: none; padding: 6px 16px; font-size: 0.85rem; margin-left: 10px;">
-                    🔑 <span data-i18n="auth.login">Login</span>
-                </button>
-                <button id="logout-btn" class="btn btn-danger" onclick="logout()" style="display: none; padding: 6px 16px; font-size: 0.85rem; margin-left: 10px;">
-                    🚪
-                </button>
-            </div>
-        </header>
-
-        <div class="tabs">
-            <div class="tab-bar">
-                <button class="tab-btn" data-tab="dashboard" onclick="switchTab('dashboard')"><span data-i18n="dashboard.title">📊 Dashboard</span></button>
-                <button class="tab-btn" data-tab="profiles" onclick="switchTab('profiles')"><span data-i18n="profiles.title">📋 Profiles</span></button>
-                <button class="tab-btn" data-tab="targets" onclick="switchTab('targets')"><span data-i18n="targets.title">⚡ Targets</span></button>
-                <button class="tab-btn" data-tab="streams" onclick="switchTab('streams')"><span data-i18n="streams.title">📺 Sources</span></button>
-            </div>
-
-            <div class="tab-panel" id="tab-dashboard">
-                <div id="dashboard-content">
-                    <div class="loading-spinner"></div>
-                </div>
-            </div>
-
-            <div class="tab-panel" id="tab-profiles">
-                <div id="profiles-content">
-                    <div class="loading-spinner"></div>
-                </div>
-            </div>
-
-            <div class="tab-panel" id="tab-targets">
-                <div id="targets-panel-content">
-                    <div class="loading-spinner"></div>
-                </div>
-            </div>
-
-            <div class="tab-panel" id="tab-streams">
-                <div id="streams-list">
-                    <div class="loading-spinner"></div>
-                </div>
-            </div>
-
-            <script>
-                // Apply saved tab immediately during parse to prevent visible jump
-                (function() {
-                    var saved = localStorage.getItem('activeTab');
-                    if (saved === 'devices') saved = 'targets';
-                    if (!saved || !document.getElementById('tab-' + saved)) saved = 'dashboard';
-                    document.querySelectorAll('.tab-btn').forEach(function(btn) { btn.classList.toggle('active', btn.dataset.tab === saved); });
-                    document.querySelectorAll('.tab-panel').forEach(function(panel) { panel.classList.toggle('active', panel.id === 'tab-' + saved); });
-                })();
-            </script>
-        </div>
-
-        <footer class="app-footer">
-            <div class="footer-content">
-                <p>
-                    Created by <strong>Alexei Dolgolyov</strong>
-                    • <a href="mailto:dolgolyov.alexei@gmail.com">dolgolyov.alexei@gmail.com</a>
-                    • <a href="https://git.dolgolyov-family.by/alexei.dolgolyov/wled-screen-controller-mixed" target="_blank" rel="noopener">Source Code</a>
-                </p>
-            </div>
-        </footer>
-    </div>
-
-    <div id="toast" class="toast"></div>
-
-    <!-- Calibration Modal -->
-    <div id="calibration-modal" class="modal">
-        <div class="modal-content" style="max-width: 700px;">
-            <div class="modal-header">
-                <h2 data-i18n="calibration.title">📐 LED Calibration</h2>
-                <button class="tutorial-trigger-btn" onclick="startCalibrationTutorial()" data-i18n-title="calibration.tutorial.start" title="Start tutorial">?</button>
-                <button class="modal-close-btn" onclick="closeCalibrationModal()" title="Close">&#x2715;</button>
-            </div>
-            <div class="modal-body">
-                <input type="hidden" id="calibration-device-id">
-                <!-- Interactive Preview with integrated LED inputs and test toggles -->
-                <div style="margin-bottom: 12px; padding: 0 24px;">
-                    <div class="calibration-preview">
-                        <!-- Screen with direction toggle, total LEDs, and offset -->
-                        <div class="preview-screen">
-                            <button type="button" class="direction-toggle" onclick="toggleDirection()" title="Toggle direction">
-                                <span id="direction-icon">↻</span> <span id="direction-label">CW</span>
-                            </button>
-                            <div class="preview-screen-total" onclick="toggleEdgeInputs()" title="Toggle edge LED inputs"><span id="cal-total-leds-inline">0</span> / <span id="cal-device-led-count-inline">0</span></div>
-                            <div class="preview-screen-border-width">
-                                <label for="cal-border-width" data-i18n="calibration.border_width">Border (px):</label>
-                                <input type="number" id="cal-border-width" min="1" max="100" value="10">
-                            </div>
-                        </div>
-
-                        <!-- Edge bars with span controls and LED count inputs -->
-                        <div class="preview-edge edge-top">
-                            <div class="edge-span-bar" data-edge="top">
-                                <div class="edge-span-handle edge-span-handle-start" data-edge="top" data-handle="start"></div>
-                                <div class="edge-span-handle edge-span-handle-end" data-edge="top" data-handle="end"></div>
-                            </div>
-                            <input type="number" id="cal-top-leds" class="edge-led-input" min="0" value="0"
-                                   oninput="updateCalibrationPreview()">
-                        </div>
-                        <div class="preview-edge edge-right">
-                            <div class="edge-span-bar" data-edge="right">
-                                <div class="edge-span-handle edge-span-handle-start" data-edge="right" data-handle="start"></div>
-                                <div class="edge-span-handle edge-span-handle-end" data-edge="right" data-handle="end"></div>
-                            </div>
-                            <input type="number" id="cal-right-leds" class="edge-led-input" min="0" value="0"
-                                   oninput="updateCalibrationPreview()">
-                        </div>
-                        <div class="preview-edge edge-bottom">
-                            <div class="edge-span-bar" data-edge="bottom">
-                                <div class="edge-span-handle edge-span-handle-start" data-edge="bottom" data-handle="start"></div>
-                                <div class="edge-span-handle edge-span-handle-end" data-edge="bottom" data-handle="end"></div>
-                            </div>
-                            <input type="number" id="cal-bottom-leds" class="edge-led-input" min="0" value="0"
-                                   oninput="updateCalibrationPreview()">
-                        </div>
-                        <div class="preview-edge edge-left">
-                            <div class="edge-span-bar" data-edge="left">
-                                <div class="edge-span-handle edge-span-handle-start" data-edge="left" data-handle="start"></div>
-                                <div class="edge-span-handle edge-span-handle-end" data-edge="left" data-handle="end"></div>
-                            </div>
-                            <input type="number" id="cal-left-leds" class="edge-led-input" min="0" value="0"
-                                   oninput="updateCalibrationPreview()">
-                        </div>
-
-                        <!-- Edge test toggle zones (outside container border, in tick area) -->
-                        <div class="edge-toggle toggle-top" onclick="toggleTestEdge('top')"></div>
-                        <div class="edge-toggle toggle-right" onclick="toggleTestEdge('right')"></div>
-                        <div class="edge-toggle toggle-bottom" onclick="toggleTestEdge('bottom')"></div>
-                        <div class="edge-toggle toggle-left" onclick="toggleTestEdge('left')"></div>
-
-                        <!-- Corner start position buttons -->
-                        <div class="preview-corner corner-top-left" onclick="setStartPosition('top_left')">●</div>
-                        <div class="preview-corner corner-top-right" onclick="setStartPosition('top_right')">●</div>
-                        <div class="preview-corner corner-bottom-left" onclick="setStartPosition('bottom_left')">●</div>
-                        <div class="preview-corner corner-bottom-right" onclick="setStartPosition('bottom_right')">●</div>
-
-                        <!-- Canvas overlay for ticks, arrows, start label -->
-                        <canvas id="calibration-preview-canvas"></canvas>
-                    </div>
-                </div>
-
-                <!-- Hidden selects (used by saveCalibration) -->
-                <div style="display: none;">
-                    <select id="cal-start-position">
-                        <option value="bottom_left">Bottom Left</option>
-                        <option value="bottom_right">Bottom Right</option>
-                        <option value="top_left">Top Left</option>
-                        <option value="top_right">Top Right</option>
-                    </select>
-                    <select id="cal-layout">
-                        <option value="clockwise">Clockwise</option>
-                        <option value="counterclockwise">Counterclockwise</option>
-                    </select>
-                </div>
-
-
-                <!-- Offset & Skip LEDs -->
-                <div style="display: grid; grid-template-columns: 1fr 1fr 1fr; gap: 16px; padding: 0 24px;">
-                    <div class="form-group">
-                        <div class="label-row">
-                            <label for="cal-offset" data-i18n="calibration.offset">LED Offset:</label>
-                            <button type="button" class="hint-toggle" onclick="toggleHint(this)" title="?">?</button>
-                        </div>
-                        <small class="input-hint" style="display:none" data-i18n="calibration.offset.hint">Distance from physical LED 0 to the start corner (along strip direction)</small>
-                        <input type="number" id="cal-offset" min="0" value="0" oninput="updateOffsetSkipLock(); updateCalibrationPreview()">
-                    </div>
-                    <div class="form-group">
-                        <div class="label-row">
-                            <label for="cal-skip-start" data-i18n="calibration.skip_start">Skip LEDs (Start):</label>
-                            <button type="button" class="hint-toggle" onclick="toggleHint(this)" title="?">?</button>
-                        </div>
-                        <small class="input-hint" style="display:none" data-i18n="calibration.skip_start.hint">Number of LEDs to turn off at the beginning of the strip (0 = none)</small>
-                        <input type="number" id="cal-skip-start" min="0" value="0" oninput="updateOffsetSkipLock(); updateCalibrationPreview()">
-                    </div>
-                    <div class="form-group">
-                        <div class="label-row">
-                            <label for="cal-skip-end" data-i18n="calibration.skip_end">Skip LEDs (End):</label>
-                            <button type="button" class="hint-toggle" onclick="toggleHint(this)" title="?">?</button>
-                        </div>
-                        <small class="input-hint" style="display:none" data-i18n="calibration.skip_end.hint">Number of LEDs to turn off at the end of the strip (0 = none)</small>
-                        <input type="number" id="cal-skip-end" min="0" value="0" oninput="updateOffsetSkipLock(); updateCalibrationPreview()">
-                    </div>
-                </div>
-
-                <!-- Tutorial Overlay -->
-                <div id="tutorial-overlay" class="tutorial-overlay">
-                    <div class="tutorial-backdrop"></div>
-                    <div class="tutorial-ring"></div>
-                    <div class="tutorial-tooltip">
-                        <div class="tutorial-tooltip-header">
-                            <span class="tutorial-step-counter"></span>
-                            <button class="tutorial-close-btn" onclick="closeTutorial()">&times;</button>
-                        </div>
-                        <p class="tutorial-tooltip-text"></p>
-                        <div class="tutorial-tooltip-nav">
-                            <button class="tutorial-prev-btn" onclick="tutorialPrev()">&#8592;</button>
-                            <button class="tutorial-next-btn" onclick="tutorialNext()">&#8594;</button>
-                        </div>
-                    </div>
-                </div>
-
-                <div id="calibration-error" class="error-message" style="display: none;"></div>
-            </div>
-            <div class="modal-footer">
-                <button class="btn btn-icon btn-secondary" onclick="closeCalibrationModal()" title="Cancel">&#x2715;</button>
-                <button class="btn btn-icon btn-primary" onclick="saveCalibration()" title="Save">&#x2713;</button>
-            </div>
-        </div>
-    </div>
-
-    <!-- General Settings Modal -->
-    <div id="device-settings-modal" class="modal">
-        <div class="modal-content">
-            <div class="modal-header">
-                <h2 data-i18n="settings.general.title">⚙️ General Settings</h2>
-                <button class="modal-close-btn" onclick="closeDeviceSettingsModal()" title="Close">&#x2715;</button>
-            </div>
-            <div class="modal-body">
-                <form id="device-settings-form">
-                    <input type="hidden" id="settings-device-id">
-
-                    <div class="form-group">
-                        <label for="settings-device-name" data-i18n="device.name">Device Name:</label>
-                        <input type="text" id="settings-device-name" data-i18n-placeholder="device.name.placeholder" placeholder="Living Room TV" required>
-                    </div>
-
-                    <div class="form-group" id="settings-url-group">
-                        <div class="label-row">
-                            <label for="settings-device-url" data-i18n="device.url">URL:</label>
-                            <button type="button" class="hint-toggle" onclick="toggleHint(this)" title="?">?</button>
-                        </div>
-                        <small class="input-hint" style="display:none" data-i18n="settings.url.hint">IP address or hostname of the device</small>
-                        <input type="text" id="settings-device-url" data-i18n-placeholder="device.url.placeholder" placeholder="http://192.168.1.100" required>
-                    </div>
-                    <div class="form-group" id="settings-serial-port-group" style="display: none;">
-                        <div class="label-row">
-                            <label for="settings-serial-port" data-i18n="device.serial_port">Serial Port:</label>
-                            <button type="button" class="hint-toggle" onclick="toggleHint(this)" title="?">?</button>
-                        </div>
-                        <small class="input-hint" style="display:none" data-i18n="device.serial_port.hint">Select the COM port of the Adalight device</small>
-                        <select id="settings-serial-port"></select>
-                    </div>
-
-                    <div class="form-group" id="settings-led-count-group" style="display: none;">
-                        <div class="label-row">
-                            <label for="settings-led-count" data-i18n="device.led_count">LED Count:</label>
-                            <button type="button" class="hint-toggle" onclick="toggleHint(this)" title="?">?</button>
-                        </div>
-                        <small class="input-hint" style="display:none" data-i18n="device.led_count_manual.hint">Number of LEDs on the strip (must match your Arduino sketch)</small>
-                        <input type="number" id="settings-led-count" min="1" max="10000" oninput="updateSettingsBaudFpsHint()">
-                    </div>
-                    <div class="form-group" id="settings-baud-rate-group" style="display: none;">
-                        <div class="label-row">
-                            <label for="settings-baud-rate" data-i18n="device.baud_rate">Baud Rate:</label>
-                            <button type="button" class="hint-toggle" onclick="toggleHint(this)" title="?">?</button>
-                        </div>
-                        <small class="input-hint" style="display:none" data-i18n="device.baud_rate.hint">Serial communication speed. Higher = more FPS but requires matching Arduino sketch.</small>
-                        <select id="settings-baud-rate" onchange="updateSettingsBaudFpsHint()">
-                            <option value="115200">115200</option>
-                            <option value="230400">230400</option>
-                            <option value="460800">460800</option>
-                            <option value="500000">500000</option>
-                            <option value="921600">921600</option>
-                            <option value="1000000">1000000</option>
-                            <option value="1500000">1500000</option>
-                            <option value="2000000">2000000</option>
-                        </select>
-                        <small id="settings-baud-fps-hint" class="fps-hint" style="display:none"></small>
-                    </div>
-
-                    <div class="form-group">
-                        <div class="label-row">
-                            <label for="settings-health-interval" data-i18n="settings.health_interval">Health Check Interval (s):</label>
-                            <button type="button" class="hint-toggle" onclick="toggleHint(this)" title="?">?</button>
-                        </div>
-                        <small class="input-hint" style="display:none" data-i18n="settings.health_interval.hint">How often to check the device status (5-600 seconds)</small>
-                        <input type="number" id="settings-health-interval" min="5" max="600" value="30">
-                    </div>
-
-                    <div class="form-group settings-toggle-group">
-                        <div class="label-row">
-                            <label data-i18n="settings.auto_shutdown">Auto Restore:</label>
-                            <button type="button" class="hint-toggle" onclick="toggleHint(this)" title="?">?</button>
-                        </div>
-                        <small class="input-hint" style="display:none" data-i18n="settings.auto_shutdown.hint">Restore device to idle state when targets stop or server shuts down</small>
-                        <label class="settings-toggle">
-                            <input type="checkbox" id="settings-auto-shutdown">
-                            <span class="settings-toggle-slider"></span>
-                        </label>
-                    </div>
-
-                    <div id="settings-error" class="error-message" style="display: none;"></div>
-                </form>
-            </div>
-            <div class="modal-footer">
-                <button class="btn btn-icon btn-secondary" onclick="closeDeviceSettingsModal()" title="Cancel">&#x2715;</button>
-                <button class="btn btn-icon btn-primary" onclick="saveDeviceSettings()" title="Save">&#x2713;</button>
-            </div>
-        </div>
-    </div>
-
-    <!-- Target Editor Modal (name, device, source, settings) -->
-    <div id="target-editor-modal" class="modal">
-        <div class="modal-content">
-            <div class="modal-header">
-                <h2 id="target-editor-title" data-i18n="targets.add">🎯 Add Target</h2>
-                <button class="modal-close-btn" onclick="closeTargetEditorModal()" title="Close">&#x2715;</button>
-            </div>
-            <div class="modal-body">
-                <form id="target-editor-form">
-                    <input type="hidden" id="target-editor-id">
-
-                    <div class="form-group">
-                        <label for="target-editor-name" data-i18n="targets.name">Target Name:</label>
-                        <input type="text" id="target-editor-name" data-i18n-placeholder="targets.name.placeholder" placeholder="My Target" required>
-                    </div>
-
-                    <div class="form-group">
-                        <div class="label-row">
-                            <label for="target-editor-device" data-i18n="targets.device">Device:</label>
-                            <button type="button" class="hint-toggle" onclick="toggleHint(this)" title="?">?</button>
-                        </div>
-                        <small class="input-hint" style="display:none" data-i18n="targets.device.hint">Select the LED device to send data to</small>
-                        <select id="target-editor-device"></select>
-                    </div>
-
-                    <div class="form-group">
-                        <div class="label-row">
-                            <label for="target-editor-source" data-i18n="targets.source">Picture Source:</label>
-                            <button type="button" class="hint-toggle" onclick="toggleHint(this)" title="?">?</button>
-                        </div>
-                        <small class="input-hint" style="display:none" data-i18n="targets.source.hint">Select a source that defines what to capture</small>
-                        <select id="target-editor-source"></select>
-                    </div>
-
-                    <div class="form-group">
-                        <div class="label-row">
-                            <label for="target-editor-fps" data-i18n="targets.fps">Target FPS:</label>
-                            <button type="button" class="hint-toggle" onclick="toggleHint(this)" title="?">?</button>
-                        </div>
-                        <small class="input-hint" style="display:none" data-i18n="targets.fps.hint">Target frames per second for capture and LED updates (10-90)</small>
-                        <div class="slider-row">
-                            <input type="range" id="target-editor-fps" min="10" max="90" value="30" oninput="document.getElementById('target-editor-fps-value').textContent = this.value">
-                            <span id="target-editor-fps-value" class="slider-value">30</span>
-                        </div>
-                    </div>
-
-                    <div class="form-group">
-                        <div class="label-row">
-                            <label for="target-editor-interpolation" data-i18n="targets.interpolation">Interpolation Mode:</label>
-                            <button type="button" class="hint-toggle" onclick="toggleHint(this)" title="?">?</button>
-                        </div>
-                        <small class="input-hint" style="display:none" data-i18n="targets.interpolation.hint">How to calculate LED color from sampled pixels</small>
-                        <select id="target-editor-interpolation">
-                            <option value="average">Average</option>
-                            <option value="median">Median</option>
-                            <option value="dominant">Dominant</option>
-                        </select>
-                    </div>
-
-                    <div class="form-group">
-                        <div class="label-row">
-                            <label for="target-editor-smoothing">
-                                <span data-i18n="targets.smoothing">Smoothing:</span>
-                                <span id="target-editor-smoothing-value">0.3</span>
-                            </label>
-                            <button type="button" class="hint-toggle" onclick="toggleHint(this)" title="?">?</button>
-                        </div>
-                        <small class="input-hint" style="display:none" data-i18n="targets.smoothing.hint">Temporal blending between frames (0=none, 1=full). Reduces flicker.</small>
-                        <input type="range" id="target-editor-smoothing" min="0.0" max="1.0" step="0.05" value="0.3" oninput="document.getElementById('target-editor-smoothing-value').textContent = this.value">
-                    </div>
-
-                    <div class="form-group" id="target-editor-standby-group">
-                        <div class="label-row">
-                            <label for="target-editor-standby-interval">
-                                <span data-i18n="targets.standby_interval">Standby Interval:</span>
-                                <span id="target-editor-standby-interval-value">1.0</span><span>s</span>
-                            </label>
-                            <button type="button" class="hint-toggle" onclick="toggleHint(this)" title="?">?</button>
-                        </div>
-                        <small class="input-hint" style="display:none" data-i18n="targets.standby_interval.hint">How often to resend the last frame when the screen is static, to keep the device in live mode (0.5-5.0s)</small>
-                        <input type="range" id="target-editor-standby-interval" min="0.5" max="5.0" step="0.5" value="1.0" oninput="document.getElementById('target-editor-standby-interval-value').textContent = this.value">
-                    </div>
-
-                    <div id="target-editor-error" class="error-message" style="display: none;"></div>
-                </form>
-            </div>
-            <div class="modal-footer">
-                <button class="btn btn-icon btn-secondary" onclick="closeTargetEditorModal()" title="Cancel">&#x2715;</button>
-                <button class="btn btn-icon btn-primary" onclick="saveTargetEditor()" title="Save">&#x2713;</button>
-            </div>
-        </div>
-    </div>
-
-    <!-- Key Colors Editor Modal -->
-    <div id="kc-editor-modal" class="modal">
-        <div class="modal-content">
-            <div class="modal-header">
-                <h2 id="kc-editor-title" data-i18n="kc.add">🎨 Add Key Colors Target</h2>
-                <button class="modal-close-btn" onclick="closeKCEditorModal()" title="Close">&#x2715;</button>
-            </div>
-            <div class="modal-body">
-                <form id="kc-editor-form">
-                    <input type="hidden" id="kc-editor-id">
-
-                    <div class="form-group">
-                        <label for="kc-editor-name" data-i18n="kc.name">Target Name:</label>
-                        <input type="text" id="kc-editor-name" data-i18n-placeholder="kc.name.placeholder" placeholder="My Key Colors Target" required>
-                    </div>
-
-                    <div class="form-group">
-                        <div class="label-row">
-                            <label for="kc-editor-source" data-i18n="kc.source">Picture Source:</label>
-                            <button type="button" class="hint-toggle" onclick="toggleHint(this)" title="?">?</button>
-                        </div>
-                        <small class="input-hint" style="display:none" data-i18n="kc.source.hint">Which picture source to extract colors from</small>
-                        <select id="kc-editor-source"></select>
-                    </div>
-
-                    <div class="form-group">
-                        <div class="label-row">
-                            <label for="kc-editor-pattern-template" data-i18n="kc.pattern_template">Pattern Template:</label>
-                            <button type="button" class="hint-toggle" onclick="toggleHint(this)" title="?">?</button>
-                        </div>
-                        <small class="input-hint" style="display:none" data-i18n="kc.pattern_template.hint">Select the rectangle pattern to use for color extraction</small>
-                        <select id="kc-editor-pattern-template"></select>
-                    </div>
-
-                    <div class="form-group">
-                        <div class="label-row">
-                            <label for="kc-editor-fps" data-i18n="kc.fps">Extraction FPS:</label>
-                            <button type="button" class="hint-toggle" onclick="toggleHint(this)" title="?">?</button>
-                        </div>
-                        <small class="input-hint" style="display:none" data-i18n="kc.fps.hint">How many times per second to extract colors (1-60)</small>
-                        <div class="slider-row">
-                            <input type="range" id="kc-editor-fps" min="1" max="60" value="10" oninput="document.getElementById('kc-editor-fps-value').textContent = this.value">
-                            <span id="kc-editor-fps-value" class="slider-value">10</span>
-                        </div>
-                    </div>
-
-                    <div class="form-group">
-                        <div class="label-row">
-                            <label for="kc-editor-interpolation" data-i18n="kc.interpolation">Color Mode:</label>
-                            <button type="button" class="hint-toggle" onclick="toggleHint(this)" title="?">?</button>
-                        </div>
-                        <small class="input-hint" style="display:none" data-i18n="kc.interpolation.hint">How to compute the key color from pixels in each rectangle</small>
-                        <select id="kc-editor-interpolation">
-                            <option value="average">Average</option>
-                            <option value="median">Median</option>
-                            <option value="dominant">Dominant</option>
-                        </select>
-                    </div>
-
-                    <div class="form-group">
-                        <div class="label-row">
-                            <label for="kc-editor-smoothing">
-                                <span data-i18n="kc.smoothing">Smoothing:</span>
-                                <span id="kc-editor-smoothing-value">0.3</span>
-                            </label>
-                            <button type="button" class="hint-toggle" onclick="toggleHint(this)" title="?">?</button>
-                        </div>
-                        <small class="input-hint" style="display:none" data-i18n="kc.smoothing.hint">Temporal blending between extractions (0=none, 1=full)</small>
-                        <input type="range" id="kc-editor-smoothing" min="0.0" max="1.0" step="0.05" value="0.3" oninput="document.getElementById('kc-editor-smoothing-value').textContent = this.value">
-                    </div>
-
-                    <div id="kc-editor-error" class="error-message" style="display: none;"></div>
-                </form>
-            </div>
-            <div class="modal-footer">
-                <button class="btn btn-icon btn-secondary" onclick="closeKCEditorModal()" title="Cancel">&#x2715;</button>
-                <button class="btn btn-icon btn-primary" onclick="saveKCEditor()" title="Save">&#x2713;</button>
-            </div>
-        </div>
-    </div>
-
-    <!-- Pattern Template Editor Modal -->
-    <div id="pattern-template-modal" class="modal">
-        <div class="modal-content modal-content-wide">
-            <div class="modal-header">
-                <h2 id="pattern-template-title" data-i18n="pattern.add">📄 Add Pattern Template</h2>
-                <button class="modal-close-btn" onclick="closePatternTemplateModal()" title="Close">&#x2715;</button>
-            </div>
-            <div class="modal-body">
-                <form id="pattern-template-form">
-                    <input type="hidden" id="pattern-template-id">
-
-                    <div class="form-group">
-                        <div class="label-row">
-                            <label for="pattern-template-name" data-i18n="pattern.name">Template Name:</label>
-                            <button type="button" class="hint-toggle" onclick="toggleHint(this)" title="?">?</button>
-                        </div>
-                        <small class="input-hint" style="display:none" data-i18n="pattern.name.hint">A descriptive name for this rectangle layout</small>
-                        <input type="text" id="pattern-template-name" data-i18n-placeholder="pattern.name.placeholder" placeholder="My Pattern Template" required>
-                    </div>
-
-                    <div class="form-group">
-                        <div class="label-row">
-                            <label for="pattern-template-description" data-i18n="pattern.description_label">Description (optional):</label>
-                            <button type="button" class="hint-toggle" onclick="toggleHint(this)" title="?">?</button>
-                        </div>
-                        <small class="input-hint" style="display:none" data-i18n="pattern.description.hint">Optional notes about where or how this pattern is used</small>
-                        <input type="text" id="pattern-template-description" data-i18n-placeholder="pattern.description_placeholder" placeholder="Describe this pattern...">
-                    </div>
-
-                    <!-- Visual Editor -->
-                    <div class="form-group">
-                        <div class="label-row">
-                            <label data-i18n="pattern.visual_editor">Visual Editor</label>
-                            <button type="button" class="hint-toggle" onclick="toggleHint(this)" title="?">?</button>
-                        </div>
-                        <small class="input-hint" style="display:none" data-i18n="pattern.visual_editor.hint">Click + buttons to add rectangles. Drag edges to resize, drag inside to move.</small>
-                        <div class="pattern-bg-row">
-                            <select id="pattern-bg-source"></select>
-                            <button type="button" class="btn btn-icon btn-secondary pattern-capture-btn" onclick="capturePatternBackground()" title="Capture Background" data-i18n-title="pattern.capture_bg">📷</button>
-                        </div>
-                        <div class="pattern-canvas-container">
-                            <canvas id="pattern-canvas"></canvas>
-                        </div>
-                    </div>
-
-                    <!-- Precise coordinate list -->
-                    <div class="form-group">
-                        <div id="pattern-rect-labels" class="pattern-rect-labels">
-                            <span data-i18n="pattern.rect.name">Name</span>
-                            <span data-i18n="pattern.rect.x">X</span>
-                            <span data-i18n="pattern.rect.y">Y</span>
-                            <span data-i18n="pattern.rect.width">W</span>
-                            <span data-i18n="pattern.rect.height">H</span>
-                            <span></span>
-                        </div>
-                        <div id="pattern-rect-list" class="pattern-rect-list"></div>
-                    </div>
-
-                    <div id="pattern-template-error" class="error-message" style="display: none;"></div>
-                </form>
-            </div>
-            <div class="modal-footer">
-                <button class="btn btn-icon btn-secondary" onclick="closePatternTemplateModal()" title="Cancel">&#x2715;</button>
-                <button class="btn btn-icon btn-primary" onclick="savePatternTemplate()" title="Save">&#x2713;</button>
-            </div>
-        </div>
-    </div>
-
-    <!-- Login Modal -->
-    <div id="api-key-modal" class="modal">
-        <div class="modal-content">
-            <div class="modal-header">
-                <h2 data-i18n="auth.title">🔑 Login to LED Grab</h2>
-                <button class="modal-close-btn" id="modal-close-x-btn" onclick="closeApiKeyModal()" title="Close">&#x2715;</button>
-            </div>
-            <form id="api-key-form" onsubmit="submitApiKey(event)">
-                <div class="modal-body">
-                    <p class="modal-description" data-i18n="auth.message">
-                        Please enter your API key to authenticate and access the LED Grab.
-                    </p>
-                    <div class="form-group">
-                        <div class="label-row">
-                            <label for="api-key-input" data-i18n="auth.label">API Key:</label>
-                            <button type="button" class="hint-toggle" onclick="toggleHint(this)" title="?">?</button>
-                        </div>
-                        <small class="input-hint" style="display:none" data-i18n="auth.hint">Your API key will be stored securely in your browser's local storage.</small>
-                        <div class="password-input-wrapper">
-                            <input
-                                type="password"
-                                id="api-key-input"
-                                data-i18n-placeholder="auth.placeholder"
-                                placeholder="Enter your API key..."
-                                autocomplete="off"
-                            >
-                            <button type="button" class="password-toggle" onclick="togglePasswordVisibility()">
-                                👁️
-                            </button>
-                        </div>
-                    </div>
-                    <div id="api-key-error" class="error-message" style="display: none;"></div>
-                </div>
-                <div class="modal-footer">
-                    <button type="button" class="btn btn-icon btn-secondary" onclick="closeApiKeyModal()" id="modal-cancel-btn" title="Cancel">&#x2715;</button>
-                    <button type="submit" class="btn btn-icon btn-primary" title="Login">&#x2713;</button>
-                </div>
-            </form>
-        </div>
-    </div>
-
-    <!-- Confirmation Modal -->
-    <div id="confirm-modal" class="modal">
-        <div class="modal-content" style="max-width: 450px;">
-            <div class="modal-header">
-                <h2 id="confirm-title">Confirm Action</h2>
-                <button class="modal-close-btn" onclick="closeConfirmModal(false)" title="Close">&#x2715;</button>
-            </div>
-            <div class="modal-body">
-                <p id="confirm-message" class="modal-description"></p>
-            </div>
-            <div class="modal-footer">
-                <button class="btn btn-danger" id="confirm-no-btn" onclick="closeConfirmModal(false)">No</button>
-                <button class="btn btn-secondary" id="confirm-yes-btn" onclick="closeConfirmModal(true)">Yes</button>
-            </div>
-        </div>
-    </div>
-
-    <!-- Add Device Modal -->
-    <div id="add-device-modal" class="modal">
-        <div class="modal-content">
-            <div class="modal-header">
-                <h2 data-i18n="devices.add">Add New Device</h2>
-                <div class="modal-header-actions">
-                    <button type="button" class="modal-header-btn" id="scan-network-btn" onclick="scanForDevices()" data-i18n-title="device.scan" title="Auto Discovery">&#x1F50D;</button>
-                    <button class="modal-close-btn" onclick="closeAddDeviceModal()" title="Close">&#x2715;</button>
-                </div>
-            </div>
-            <div class="modal-body">
-                <div id="discovery-section" class="discovery-section" style="display: none;">
-                    <div id="discovery-loading" class="discovery-loading" style="display: none;">
-                        <span class="discovery-spinner"></span>
-                    </div>
-                    <div id="discovery-list" class="discovery-list"></div>
-                    <div id="discovery-empty" style="display: none;">
-                        <small data-i18n="device.scan.empty">No devices found</small>
-                    </div>
-                    <hr class="modal-divider">
-                </div>
-                <form id="add-device-form">
-                    <div class="form-group">
-                        <div class="label-row">
-                            <label for="device-type" data-i18n="device.type">Device Type:</label>
-                            <button type="button" class="hint-toggle" onclick="toggleHint(this)" title="?">?</button>
-                        </div>
-                        <small class="input-hint" style="display:none" data-i18n="device.type.hint">Select the type of LED controller</small>
-                        <select id="device-type" onchange="onDeviceTypeChanged()">
-                            <option value="wled">WLED</option>
-                            <option value="adalight">Adalight</option>
-                            <option value="ambiled">AmbiLED</option>
-                        </select>
-                    </div>
-                    <div class="form-group">
-                        <label for="device-name" data-i18n="device.name">Device Name:</label>
-                        <input type="text" id="device-name" data-i18n-placeholder="device.name.placeholder" placeholder="Living Room TV" required>
-                    </div>
-                    <div class="form-group" id="device-url-group">
-                        <div class="label-row">
-                            <label for="device-url" id="device-url-label" data-i18n="device.url">URL:</label>
-                            <button type="button" class="hint-toggle" onclick="toggleHint(this)" title="?">?</button>
-                        </div>
-                        <small class="input-hint" style="display:none" id="device-url-hint" data-i18n="device.url.hint">IP address or hostname of the device (e.g. http://192.168.1.100)</small>
-                        <input type="text" id="device-url" data-i18n-placeholder="device.url.placeholder" placeholder="http://192.168.1.100" required>
-                    </div>
-                    <div class="form-group" id="device-serial-port-group" style="display: none;">
-                        <div class="label-row">
-                            <label for="device-serial-port" id="device-serial-port-label" data-i18n="device.serial_port">Serial Port:</label>
-                            <button type="button" class="hint-toggle" onclick="toggleHint(this)" title="?">?</button>
-                        </div>
-                        <small class="input-hint" style="display:none" data-i18n="device.serial_port.hint">Select the COM port of the Adalight device</small>
-                        <select id="device-serial-port" onfocus="onSerialPortFocus()"></select>
-                    </div>
-                    <div class="form-group" id="device-led-count-group" style="display: none;">
-                        <div class="label-row">
-                            <label for="device-led-count" data-i18n="device.led_count">LED Count:</label>
-                            <button type="button" class="hint-toggle" onclick="toggleHint(this)" title="?">?</button>
-                        </div>
-                        <small class="input-hint" style="display:none" data-i18n="device.led_count_manual.hint">Number of LEDs on the strip (must match your Arduino sketch)</small>
-                        <input type="number" id="device-led-count" min="1" max="10000" placeholder="60" oninput="updateBaudFpsHint()">
-                    </div>
-                    <div class="form-group" id="device-baud-rate-group" style="display: none;">
-                        <div class="label-row">
-                            <label for="device-baud-rate" data-i18n="device.baud_rate">Baud Rate:</label>
-                            <button type="button" class="hint-toggle" onclick="toggleHint(this)" title="?">?</button>
-                        </div>
-                        <small class="input-hint" style="display:none" data-i18n="device.baud_rate.hint">Serial communication speed. Higher = more FPS but requires matching Arduino sketch.</small>
-                        <select id="device-baud-rate" onchange="updateBaudFpsHint()">
-                            <option value="115200">115200</option>
-                            <option value="230400">230400</option>
-                            <option value="460800">460800</option>
-                            <option value="500000">500000</option>
-                            <option value="921600">921600</option>
-                            <option value="1000000">1000000</option>
-                            <option value="1500000">1500000</option>
-                            <option value="2000000">2000000</option>
-                        </select>
-                        <small id="baud-fps-hint" class="fps-hint" style="display:none"></small>
-                    </div>
-                    <div id="add-device-error" class="error-message" style="display: none;"></div>
-                </form>
-            </div>
-            <div class="modal-footer">
-                <button class="btn btn-icon btn-secondary" onclick="closeAddDeviceModal()" title="Cancel">&#x2715;</button>
-                <button class="btn btn-icon btn-primary" onclick="document.getElementById('add-device-form').requestSubmit()" title="Add Device">&#x2713;</button>
-            </div>
-        </div>
-    </div>
-
-    <!-- Template Modal -->
-    <div id="template-modal" class="modal">
-        <div class="modal-content">
-            <div class="modal-header">
-                <h2 id="template-modal-title" data-i18n="templates.add">Add Capture Template</h2>
-                <button class="modal-close-btn" onclick="closeTemplateModal()" title="Close">&#x2715;</button>
-            </div>
-            <div class="modal-body">
-                <input type="hidden" id="template-id">
-                <form id="template-form">
-                    <div class="form-group">
-                        <label for="template-name" data-i18n="templates.name">Template Name:</label>
-                        <input type="text" id="template-name" data-i18n-placeholder="templates.name.placeholder" placeholder="My Custom Template" required>
-                    </div>
-
-                    <div class="form-group">
-                        <label for="template-description" data-i18n="templates.description.label">Description (optional):</label>
-                        <input type="text" id="template-description" data-i18n-placeholder="templates.description.placeholder" placeholder="Describe this template..." maxlength="500">
-                    </div>
-
-                    <div class="form-group">
-                        <div class="label-row">
-                            <label for="template-engine" data-i18n="templates.engine">Capture Engine:</label>
-                            <button type="button" class="hint-toggle" onclick="toggleHint(this)" title="?">?</button>
-                        </div>
-                        <small class="input-hint" style="display:none" data-i18n="templates.engine.hint">Select the screen capture technology to use</small>
-                        <select id="template-engine" onchange="onEngineChange()" required>
-                        </select>
-                        <small id="engine-availability-hint" class="form-hint" style="display: none;"></small>
-                    </div>
-
-                    <div id="engine-config-section" style="display: none;">
-                        <h3 data-i18n="templates.config">Configuration</h3>
-                        <div id="engine-config-fields"></div>
-                    </div>
-
-                    <div id="template-error" class="error-message" style="display: none;"></div>
-                </form>
-            </div>
-            <div class="modal-footer">
-                <button class="btn btn-icon btn-secondary" onclick="closeTemplateModal()" title="Cancel">&#x2715;</button>
-                <button class="btn btn-icon btn-primary" onclick="saveTemplate()" title="Save">&#x2713;</button>
-            </div>
-        </div>
-    </div>
-
-    <!-- Test Template Modal -->
-    <div id="test-template-modal" class="modal">
-        <div class="modal-content">
-            <div class="modal-header">
-                <h2 data-i18n="templates.test.title">Test Capture Template</h2>
-                <button class="modal-close-btn" onclick="closeTestTemplateModal()" title="Close">&#x2715;</button>
-            </div>
-            <div class="modal-body">
-                <div class="form-group">
-                    <label data-i18n="templates.test.display">Display:</label>
-                    <input type="hidden" id="test-template-display" value="">
-                    <button type="button" class="btn btn-display-picker" id="test-display-picker-btn" onclick="openDisplayPicker(onTestDisplaySelected, document.getElementById('test-template-display').value)">
-                        <span id="test-display-picker-label" data-i18n="displays.picker.select">Select display...</span>
-                    </button>
-                </div>
-
-                <div class="form-group">
-                    <label for="test-template-duration">
-                        <span data-i18n="templates.test.duration">Capture Duration (s):</span>
-                        <span id="test-template-duration-value">5</span>
-                    </label>
-                    <input type="range" id="test-template-duration" min="1" max="10" step="1" value="5" oninput="updateCaptureDuration(this.value)" />
-                </div>
-
-                <button type="button" class="btn btn-primary" onclick="runTemplateTest()" style="margin-top: 16px;">
-                    <span data-i18n="templates.test.run">🧪 Run</span>
-                </button>
-
-            </div>
-        </div>
-    </div>
-
-    <!-- Test Source Modal -->
-    <div id="test-stream-modal" class="modal">
-        <div class="modal-content">
-            <div class="modal-header">
-                <h2 data-i18n="streams.test.title">Test Source</h2>
-                <button class="modal-close-btn" onclick="closeTestStreamModal()" title="Close">&#x2715;</button>
-            </div>
-            <div class="modal-body">
-                <div class="form-group">
-                    <label for="test-stream-duration">
-                        <span data-i18n="streams.test.duration">Capture Duration (s):</span>
-                        <span id="test-stream-duration-value">5</span>
-                    </label>
-                    <input type="range" id="test-stream-duration" min="1" max="10" step="1" value="5" oninput="updateStreamTestDuration(this.value)" />
-                </div>
-
-                <button type="button" class="btn btn-primary" onclick="runStreamTest()" style="margin-top: 16px;">
-                    <span data-i18n="streams.test.run">🧪 Run</span>
-                </button>
-
-            </div>
-        </div>
-    </div>
-
-    <!-- Test PP Template Modal -->
-    <div id="test-pp-template-modal" class="modal">
-        <div class="modal-content">
-            <div class="modal-header">
-                <h2 data-i18n="postprocessing.test.title">Test Processing Template</h2>
-                <button class="modal-close-btn" onclick="closeTestPPTemplateModal()" title="Close">&#x2715;</button>
-            </div>
-            <div class="modal-body">
-                <div class="form-group">
-                    <label data-i18n="postprocessing.test.source_stream">Source:</label>
-                    <select id="test-pp-source-stream"></select>
-                </div>
-                <div class="form-group">
-                    <label for="test-pp-duration">
-                        <span data-i18n="streams.test.duration">Capture Duration (s):</span>
-                        <span id="test-pp-duration-value">5</span>
-                    </label>
-                    <input type="range" id="test-pp-duration" min="1" max="10" step="1" value="5" oninput="updatePPTestDuration(this.value)" />
-                </div>
-
-                <button type="button" class="btn btn-primary" onclick="runPPTemplateTest()" style="margin-top: 16px;">
-                    <span data-i18n="streams.test.run">🧪 Run</span>
-                </button>
-
-            </div>
-        </div>
-    </div>
-
-    <!-- Source Modal -->
-    <div id="stream-modal" class="modal">
-        <div class="modal-content">
-            <div class="modal-header">
-                <h2 id="stream-modal-title" data-i18n="streams.add">Add Source</h2>
-                <button class="modal-close-btn" onclick="closeStreamModal()" title="Close">&#x2715;</button>
-            </div>
-            <div class="modal-body">
-                <input type="hidden" id="stream-id">
-                <form id="stream-form">
-                    <div class="form-group">
-                        <label for="stream-name" data-i18n="streams.name">Source Name:</label>
-                        <input type="text" id="stream-name" data-i18n-placeholder="streams.name.placeholder" placeholder="My Source" required>
-                    </div>
-
-                    <input type="hidden" id="stream-type" value="raw">
-
-                    <!-- Raw source fields -->
-                    <div id="stream-raw-fields">
-                        <div class="form-group">
-                            <div class="label-row">
-                                <label data-i18n="streams.display">Display:</label>
-                                <button type="button" class="hint-toggle" onclick="toggleHint(this)" title="?">?</button>
-                            </div>
-                            <small class="input-hint" style="display:none" data-i18n="streams.display.hint">Which screen to capture</small>
-                            <input type="hidden" id="stream-display-index" value="">
-                            <button type="button" class="btn btn-display-picker" id="stream-display-picker-btn" onclick="openDisplayPicker(onStreamDisplaySelected, document.getElementById('stream-display-index').value)">
-                                <span id="stream-display-picker-label" data-i18n="displays.picker.select">Select display...</span>
-                            </button>
-                        </div>
-                        <div class="form-group">
-                            <div class="label-row">
-                                <label for="stream-capture-template" data-i18n="streams.capture_template">Capture Template:</label>
-                                <button type="button" class="hint-toggle" onclick="toggleHint(this)" title="?">?</button>
-                            </div>
-                            <small class="input-hint" style="display:none" data-i18n="streams.capture_template.hint">Engine template defining how the screen is captured</small>
-                            <select id="stream-capture-template"></select>
-                        </div>
-                        <div class="form-group">
-                            <div class="label-row">
-                                <label for="stream-target-fps" data-i18n="streams.target_fps">Target FPS:</label>
-                                <button type="button" class="hint-toggle" onclick="toggleHint(this)" title="?">?</button>
-                            </div>
-                            <small class="input-hint" style="display:none" data-i18n="streams.target_fps.hint">Target frames per second for capture (10-90)</small>
-                            <div class="slider-row">
-                                <input type="range" id="stream-target-fps" min="10" max="90" value="30" oninput="document.getElementById('stream-target-fps-value').textContent = this.value">
-                                <span id="stream-target-fps-value" class="slider-value">30</span>
-                            </div>
-                        </div>
-                    </div>
-
-                    <!-- Processed source fields -->
-                    <div id="stream-processed-fields" style="display: none;">
-                        <div class="form-group">
-                            <div class="label-row">
-                                <label for="stream-source" data-i18n="streams.source">Source:</label>
-                                <button type="button" class="hint-toggle" onclick="toggleHint(this)" title="?">?</button>
-                            </div>
-                            <small class="input-hint" style="display:none" data-i18n="streams.source.hint">The source to apply processing filters to</small>
-                            <select id="stream-source"></select>
-                        </div>
-                        <div class="form-group">
-                            <div class="label-row">
-                                <label for="stream-pp-template" data-i18n="streams.pp_template">Processing Template:</label>
-                                <button type="button" class="hint-toggle" onclick="toggleHint(this)" title="?">?</button>
-                            </div>
-                            <small class="input-hint" style="display:none" data-i18n="streams.pp_template.hint">Filter template to apply to the source</small>
-                            <select id="stream-pp-template"></select>
-                        </div>
-                    </div>
-
-                    <!-- Static image fields -->
-                    <div id="stream-static-image-fields" style="display: none;">
-                        <div class="form-group">
-                            <div class="label-row">
-                                <label for="stream-image-source" data-i18n="streams.image_source">Image Source:</label>
-                                <button type="button" class="hint-toggle" onclick="toggleHint(this)" title="?">?</button>
-                            </div>
-                            <small class="input-hint" style="display:none" data-i18n="streams.image_source.hint">Enter a URL (http/https) or local file path to an image</small>
-                            <input type="text" id="stream-image-source" data-i18n-placeholder="streams.image_source.placeholder" placeholder="https://example.com/image.jpg or C:\path\to\image.png">
-                        </div>
-                        <div id="stream-image-preview-container" class="image-preview-container" style="display: none;">
-                            <img id="stream-image-preview" class="stream-image-preview" src="" alt="Preview">
-                            <div id="stream-image-info" class="stream-image-info"></div>
-                        </div>
-                        <div id="stream-image-validation-status" class="validation-status" style="display: none;"></div>
-                    </div>
-
-                    <div class="form-group">
-                        <label for="stream-description" data-i18n="streams.description_label">Description (optional):</label>
-                        <input type="text" id="stream-description" data-i18n-placeholder="streams.description_placeholder" placeholder="Describe this source...">
-                    </div>
-
-                    <div id="stream-error" class="error-message" style="display: none;"></div>
-                </form>
-            </div>
-            <div class="modal-footer">
-                <button class="btn btn-icon btn-secondary" onclick="closeStreamModal()" title="Cancel">&#x2715;</button>
-                <button class="btn btn-icon btn-primary" onclick="saveStream()" title="Save">&#x2713;</button>
-            </div>
-        </div>
-    </div>
-
-    <!-- Processing Template Modal -->
-    <div id="pp-template-modal" class="modal">
-        <div class="modal-content">
-            <div class="modal-header">
-                <h2 id="pp-template-modal-title" data-i18n="postprocessing.add">Add Processing Template</h2>
-                <button class="modal-close-btn" onclick="closePPTemplateModal()" title="Close">&#x2715;</button>
-            </div>
-            <div class="modal-body">
-                <input type="hidden" id="pp-template-id">
-                <form id="pp-template-form">
-                    <div class="form-group">
-                        <label for="pp-template-name" data-i18n="postprocessing.name">Template Name:</label>
-                        <input type="text" id="pp-template-name" data-i18n-placeholder="postprocessing.name.placeholder" placeholder="My Processing Template" required>
-                    </div>
-
-                    <!-- Dynamic filter list -->
-                    <div id="pp-filter-list" class="pp-filter-list"></div>
-
-                    <!-- Add filter control -->
-                    <div class="pp-add-filter-row">
-                        <select id="pp-add-filter-select" class="pp-add-filter-select">
-                            <option value="" data-i18n="filters.select_type">Select filter type...</option>
-                        </select>
-                        <button type="button" class="pp-add-filter-btn" onclick="addFilterFromSelect()" title="Add Filter">+</button>
-                    </div>
-
-                    <div class="form-group">
-                        <label for="pp-template-description" data-i18n="postprocessing.description_label">Description (optional):</label>
-                        <input type="text" id="pp-template-description" data-i18n-placeholder="postprocessing.description_placeholder" placeholder="Describe this template...">
-                    </div>
-
-                    <div id="pp-template-error" class="error-message" style="display: none;"></div>
-                </form>
-            </div>
-            <div class="modal-footer">
-                <button class="btn btn-icon btn-secondary" onclick="closePPTemplateModal()" title="Cancel">&#x2715;</button>
-                <button class="btn btn-icon btn-primary" onclick="savePPTemplate()" title="Save">&#x2713;</button>
-            </div>
-        </div>
-    </div>
-
-    <!-- Profile Editor Modal -->
-    <div id="profile-editor-modal" class="modal">
-        <div class="modal-content">
-            <div class="modal-header">
-                <h2 id="profile-editor-title" data-i18n="profiles.add">📋 Add Profile</h2>
-                <button class="modal-close-btn" onclick="closeProfileEditorModal()" title="Close">&#x2715;</button>
-            </div>
-            <div class="modal-body">
-                <form id="profile-editor-form">
-                    <input type="hidden" id="profile-editor-id">
-
-                    <div class="form-group">
-                        <div class="label-row">
-                            <label for="profile-editor-name" data-i18n="profiles.name">Name:</label>
-                            <button type="button" class="hint-toggle" onclick="toggleHint(this)" title="?">?</button>
-                        </div>
-                        <small class="input-hint" style="display:none" data-i18n="profiles.name.hint">A descriptive name for this profile</small>
-                        <input type="text" id="profile-editor-name" required>
-                    </div>
-
-                    <div class="form-group settings-toggle-group">
-                        <div class="label-row">
-                            <label data-i18n="profiles.enabled">Enabled:</label>
-                            <button type="button" class="hint-toggle" onclick="toggleHint(this)" title="?">?</button>
-                        </div>
-                        <small class="input-hint" style="display:none" data-i18n="profiles.enabled.hint">Disabled profiles won't activate even when conditions are met</small>
-                        <label class="settings-toggle">
-                            <input type="checkbox" id="profile-editor-enabled" checked>
-                            <span class="settings-toggle-slider"></span>
-                        </label>
-                    </div>
-
-                    <div class="form-group">
-                        <div class="label-row">
-                            <label for="profile-editor-logic" data-i18n="profiles.condition_logic">Condition Logic:</label>
-                            <button type="button" class="hint-toggle" onclick="toggleHint(this)" title="?">?</button>
-                        </div>
-                        <small class="input-hint" style="display:none" data-i18n="profiles.condition_logic.hint">How multiple conditions are combined: ANY (OR) or ALL (AND)</small>
-                        <select id="profile-editor-logic">
-                            <option value="or" data-i18n="profiles.condition_logic.or">Any condition (OR)</option>
-                            <option value="and" data-i18n="profiles.condition_logic.and">All conditions (AND)</option>
-                        </select>
-                    </div>
-
-                    <div class="form-group">
-                        <div class="label-row">
-                            <label data-i18n="profiles.conditions">Conditions:</label>
-                            <button type="button" class="hint-toggle" onclick="toggleHint(this)" title="?">?</button>
-                        </div>
-                        <small class="input-hint" style="display:none" data-i18n="profiles.conditions.hint">Rules that determine when this profile activates</small>
-                        <div id="profile-conditions-list"></div>
-                        <button type="button" class="btn btn-secondary btn-sm" onclick="addProfileCondition()" style="margin-top: 6px;">
-                            + <span data-i18n="profiles.conditions.add">Add Condition</span>
-                        </button>
-                    </div>
-
-                    <div class="form-group">
-                        <div class="label-row">
-                            <label data-i18n="profiles.targets">Targets:</label>
-                            <button type="button" class="hint-toggle" onclick="toggleHint(this)" title="?">?</button>
-                        </div>
-                        <small class="input-hint" style="display:none" data-i18n="profiles.targets.hint">Targets to start when this profile activates</small>
-                        <div id="profile-targets-list" class="profile-targets-checklist"></div>
-                    </div>
-
-                    <div id="profile-editor-error" class="error-message" style="display: none;"></div>
-                </form>
-            </div>
-            <div class="modal-footer">
-                <button class="btn btn-icon btn-secondary" onclick="closeProfileEditorModal()" title="Cancel">&#x2715;</button>
-                <button class="btn btn-icon btn-primary" onclick="saveProfileEditor()" title="Save">&#x2713;</button>
-            </div>
-        </div>
-    </div>
-
-    <!-- Device Tutorial Overlay (viewport-level) -->
-    <div id="device-tutorial-overlay" class="tutorial-overlay tutorial-overlay-fixed">
-        <div class="tutorial-backdrop"></div>
-        <div class="tutorial-ring"></div>
-        <div class="tutorial-tooltip">
-            <div class="tutorial-tooltip-header">
-                <span class="tutorial-step-counter"></span>
-                <button class="tutorial-close-btn" onclick="closeTutorial()">&times;</button>
-            </div>
-            <p class="tutorial-tooltip-text"></p>
-            <div class="tutorial-tooltip-nav">
-                <button class="tutorial-prev-btn" onclick="tutorialPrev()">&#8592;</button>
-                <button class="tutorial-next-btn" onclick="tutorialNext()">&#8594;</button>
-            </div>
-        </div>
-    </div>
-
-    <!-- Image Lightbox -->
-    <div id="image-lightbox" class="lightbox" onclick="closeLightbox(event)">
-        <button class="lightbox-close" onclick="closeLightbox()" title="Close">&#x2715;</button>
-        <button id="lightbox-auto-refresh" class="lightbox-refresh-btn" onclick="toggleKCTestAutoRefresh()" title="Auto-refresh" style="display:none">&#x25B6;</button>
-        <div class="lightbox-content">
-            <img id="lightbox-image" src="" alt="Full size preview">
-            <div id="lightbox-stats" class="lightbox-stats" style="display: none;"></div>
-        </div>
-    </div>
-
-    <!-- Display Picker Lightbox -->
-    <div id="display-picker-lightbox" class="lightbox" onclick="closeDisplayPicker(event)">
-        <button class="lightbox-close" onclick="closeDisplayPicker()" title="Close">&#x2715;</button>
-        <div class="lightbox-content display-picker-content">
-            <h3 class="display-picker-title" data-i18n="displays.picker.title">Select a Display</h3>
-            <div id="display-picker-canvas" class="display-picker-canvas">
-                <div class="loading-spinner"></div>
-            </div>
-        </div>
-    </div>
-
-    <script type="module" src="/static/js/app.js"></script>
-    <script>
-        // Initialize theme
-        const savedTheme = localStorage.getItem('theme') || 'dark';
-        document.documentElement.setAttribute('data-theme', savedTheme);
-        updateThemeIcon(savedTheme);
-
-        function updateThemeIcon(theme) {
-            const icon = document.getElementById('theme-icon');
-            icon.textContent = theme === 'dark' ? '☀️' : '🌙';
-        }
-
-        function toggleTheme() {
-            const currentTheme = document.documentElement.getAttribute('data-theme');
-            const newTheme = currentTheme === 'dark' ? 'light' : 'dark';
-
-            document.documentElement.setAttribute('data-theme', newTheme);
-            localStorage.setItem('theme', newTheme);
-            updateThemeIcon(newTheme);
-            showToast(`Switched to ${newTheme} theme`, 'info');
-        }
-
-        // Initialize auth state
-        function updateAuthUI() {
-            const apiKey = localStorage.getItem('wled_api_key');
-            const loginBtn = document.getElementById('login-btn');
-            const logoutBtn = document.getElementById('logout-btn');
-            const tabBar = document.querySelector('.tab-bar');
-
-            if (apiKey) {
-                loginBtn.style.display = 'none';
-                logoutBtn.style.display = 'inline-block';
-                if (tabBar) tabBar.style.display = '';
-            } else {
-                loginBtn.style.display = 'inline-block';
-                logoutBtn.style.display = 'none';
-                if (tabBar) tabBar.style.display = 'none';
-            }
-        }
-
-        function showLogin() {
-            showApiKeyModal(t('auth.message'));
-            document.getElementById('modal-cancel-btn').style.display = 'inline-block';
-        }
-
-        async function logout() {
-            const confirmed = await showConfirm(t('auth.logout.confirm'));
-            if (!confirmed) {
-                return;
-            }
-
-            localStorage.removeItem('wled_api_key');
-            if (window.setApiKey) window.setApiKey(null);
-            updateAuthUI();
-            showToast(t('auth.logout.success'), 'info');
-
-            // Stop background activity
-            if (window.stopDashboardWS) window.stopDashboardWS();
-            if (window.stopPerfPolling) window.stopPerfPolling();
-            if (window.stopUptimeTimer) window.stopUptimeTimer();
-            if (window.disconnectAllKCWebSockets) window.disconnectAllKCWebSockets();
-
-            // Clear all tab panels
-            const loginMsg = `<div class="loading">${t('auth.please_login')}</div>`;
-            document.getElementById('dashboard-content').innerHTML = loginMsg;
-            document.getElementById('profiles-content').innerHTML = loginMsg;
-            document.getElementById('targets-panel-content').innerHTML = loginMsg;
-            document.getElementById('streams-list').innerHTML = loginMsg;
-        }
-
-        // Initialize on load
-        updateAuthUI();
-
-        // Modal functions
-        function togglePasswordVisibility() {
-            const input = document.getElementById('api-key-input');
-            const button = document.querySelector('.password-toggle');
-            if (input.type === 'password') {
-                input.type = 'text';
-                button.textContent = '🙈';
-            } else {
-                input.type = 'password';
-                button.textContent = '👁️';
-            }
-        }
-
-        function showApiKeyModal(message, hideCancel = false) {
-            const modal = document.getElementById('api-key-modal');
-            const description = document.querySelector('.modal-description');
-            const input = document.getElementById('api-key-input');
-            const error = document.getElementById('api-key-error');
-            const cancelBtn = document.getElementById('modal-cancel-btn');
-
-            description.textContent = message || t('auth.message');
-
-            input.value = '';
-            input.placeholder = t('auth.placeholder');
-            error.style.display = 'none';
-            modal.style.display = 'flex';
-            lockBody();
-
-            // Hide cancel button and close X if this is required login (no existing session)
-            cancelBtn.style.display = hideCancel ? 'none' : 'inline-block';
-            const closeXBtn = document.getElementById('modal-close-x-btn');
-            if (closeXBtn) closeXBtn.style.display = hideCancel ? 'none' : '';
-
-            // Hide login button while modal is open
-            document.getElementById('login-btn').style.display = 'none';
-
-            setTimeout(() => input.focus(), 100);
-        }
-
-        function closeApiKeyModal() {
-            const modal = document.getElementById('api-key-modal');
-            modal.style.display = 'none';
-            unlockBody();
-            updateAuthUI();
-        }
-
-        function submitApiKey(event) {
-            if (event) {
-                event.preventDefault();
-            }
-
-            const input = document.getElementById('api-key-input');
-            const error = document.getElementById('api-key-error');
-            const key = input.value.trim();
-
-            if (!key) {
-                error.textContent = t('auth.error.required');
-                error.style.display = 'block';
-                return;
-            }
-
-            // Store the key
-            localStorage.setItem('wled_api_key', key);
-            if (window.setApiKey) window.setApiKey(key);
-            updateAuthUI();
-
-            closeApiKeyModal();
-            showToast(t('auth.success'), 'success');
-
-            // Reload data
-            loadServerInfo();
-            loadDisplays();
-            loadTargetsTab();
-
-            // Start auto-refresh
-            startAutoRefresh();
-        }
-    </script>
-</body>
-</html>
diff --git a/server/src/wled_controller/static/style.css b/server/src/wled_controller/static/style.css
deleted file mode 100644
index 092d459..0000000
--- a/server/src/wled_controller/static/style.css
+++ /dev/null
@@ -1,3712 +0,0 @@
-* {
-    margin: 0;
-    padding: 0;
-    box-sizing: border-box;
-}
-
-:root {
-    --primary-color: #4CAF50;
-    --danger-color: #f44336;
-    --warning-color: #ff9800;
-    --info-color: #2196F3;
-}
-
-/* Dark theme (default) */
-[data-theme="dark"] {
-    --bg-color: #1a1a1a;
-    --card-bg: #2d2d2d;
-    --text-color: #e0e0e0;
-    --border-color: #404040;
-    --display-badge-bg: rgba(0, 0, 0, 0.4);
-    color-scheme: dark;
-}
-
-/* Light theme */
-[data-theme="light"] {
-    --bg-color: #f5f5f5;
-    --card-bg: #ffffff;
-    --text-color: #333333;
-    --border-color: #e0e0e0;
-    --display-badge-bg: rgba(255, 255, 255, 0.85);
-    color-scheme: light;
-}
-
-/* Default to dark theme */
-body {
-    background: var(--bg-color);
-    color: var(--text-color);
-}
-
-html {
-    background: var(--bg-color);
-    overflow-y: scroll;
-}
-
-body {
-    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
-    background: var(--bg-color);
-    color: var(--text-color);
-    line-height: 1.6;
-}
-
-body.modal-open {
-    position: fixed;
-    width: 100%;
-}
-
-.container {
-    max-width: 1200px;
-    margin: 0 auto;
-    padding: 20px;
-}
-
-header {
-    display: flex;
-    justify-content: space-between;
-    align-items: center;
-    padding: 20px 0 10px;
-    margin-bottom: 10px;
-    position: relative;
-    z-index: 2100;
-}
-
-.header-title {
-    display: flex;
-    align-items: center;
-    gap: 10px;
-}
-
-h1 {
-    font-size: 2rem;
-    color: var(--primary-color);
-}
-
-h2 {
-    margin-bottom: 20px;
-    color: var(--text-color);
-    font-size: 1.5rem;
-}
-
-.server-info {
-    display: flex;
-    align-items: center;
-    gap: 15px;
-}
-
-.header-link {
-    color: var(--text-secondary);
-    text-decoration: none;
-    font-size: 0.85rem;
-    font-weight: 500;
-    padding: 4px 8px;
-    border-radius: 4px;
-    transition: color 0.2s, background 0.2s;
-}
-
-.header-link:hover {
-    color: var(--text-color);
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-}
-
-#server-version {
-    font-size: 0.75rem;
-    font-weight: 400;
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-}
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-.status-badge {
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-.status-badge.online {
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-}
-
-.status-badge.offline {
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-}
-
-@keyframes pulse {
-    0%, 100% { opacity: 1; }
-    50% { opacity: 0.5; }
-}
-
-/* WLED device health indicator */
-.health-dot {
-    display: inline-block;
-    width: 10px;
-    height: 10px;
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-.health-dot.health-online {
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-.health-dot.health-offline {
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-.health-dot.health-unknown {
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-.health-latency {
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-.health-latency.offline {
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-section {
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-.displays-grid,
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-.devices-grid > .loading,
-.devices-grid > .loading-spinner {
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-.add-device-card {
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-.add-device-card:hover {
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-.add-device-icon {
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-.add-device-card:hover .add-device-icon {
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-.add-device-label {
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-    margin-top: 8px;
-}
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-.card {
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-    border: 1px solid var(--border-color);
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-.card:hover {
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-.card-tutorial-btn {
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-.card-tutorial-btn:hover {
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-
-.card-top-actions {
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-.card-top-actions .card-remove-btn {
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-.card-power-btn {
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-.card-power-btn:hover {
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-.card-remove-btn {
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-.card-remove-btn:hover {
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-}
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-.card-header {
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-.card-title {
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-.device-url-badge {
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-.device-url-badge:hover {
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-.device-url-icon {
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-.card-subtitle {
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-.card-meta {
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-.device-type-badge {
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-}
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-/* Device discovery */
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-}
-.btn-block {
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-}
-.discovery-list {
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-.discovery-item {
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-}
-.discovery-item:not(.discovery-item--added):hover {
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-}
-.discovery-item--added {
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-}
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-}
-.discovery-badge {
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-}
-.discovery-type-badge {
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-}
-.modal-divider {
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-}
-.discovery-loading {
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-}
-.discovery-spinner {
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-.channel-indicator {
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-.channel-indicator .ch {
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-.badge {
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-.badge.processing {
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-.badge.idle {
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-.badge.error {
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-.card-content {
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-.info-row {
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-.info-row:last-child {
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-.info-label {
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-.info-value {
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-.card-actions {
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-}
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-.btn {
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-.btn:hover {
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-.btn:disabled {
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-.btn-primary {
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-.btn-danger {
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-.btn-secondary {
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-.btn-icon {
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-.btn-icon:hover {
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-.display-card {
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-.display-header {
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-.display-index {
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-.primary-star {
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-/* Tabs */
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-.tab-btn {
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-.tab-btn:hover {
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-.tab-btn.active {
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-.tab-panel {
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-.tab-panel.active {
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-/* Display Layout Visualization */
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-}
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-.layout-display {
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-.layout-display:hover {
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-.layout-display.primary {
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-.layout-display.secondary {
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-.layout-position-label {
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-.layout-index-label {
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-.layout-display-label {
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-.layout-display-label strong {
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-.layout-display-label small {
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-.primary-indicator {
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-
-/* Card brightness slider */
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-.brightness-slider {
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-.brightness-loading .brightness-slider {
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-/* Static color picker — inline in card-subtitle */
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-.static-color-picker {
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-.btn-clear-color {
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-.btn-clear-color:hover {
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-.section-header {
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-.section-header h2 {
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-.section-tip {
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-.section-tip a {
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-ul.section-tip {
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-ul.section-tip li {
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-.form-group {
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-.settings-toggle-group {
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-.settings-toggle {
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-.settings-toggle input {
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-.settings-toggle-slider {
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-.settings-toggle-slider::after {
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-.settings-toggle input:checked + .settings-toggle-slider {
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-.settings-toggle input:checked + .settings-toggle-slider::after {
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-input[type="text"],
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-input[type="number"]:disabled,
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-input[type="range"] {
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-/* Better password field appearance */
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-input:focus,
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-/* Remove browser autofill styling */
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-.loading {
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-.loading-spinner {
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-.loading-spinner::after {
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-@keyframes spin {
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-/* Full-page overlay spinner */
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-.overlay-spinner .progress-container {
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-.overlay-spinner .progress-ring {
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-.overlay-spinner .progress-ring-circle {
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-.overlay-spinner .progress-ring-bg {
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-.overlay-spinner .progress-content {
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-.overlay-spinner .progress-percentage {
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-.overlay-spinner .spinner-text {
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-.overlay-spinner-close {
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-.overlay-spinner-close:hover {
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-@keyframes spin {
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-.toast {
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-.dashboard-profile .dashboard-target-metrics {
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-}
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-@media (max-width: 768px) {
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-    .dashboard-target-metrics {
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-    }
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-
-/* ===== PERFORMANCE CHARTS ===== */
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-}
-
-.perf-chart-card {
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-.perf-chart-unavailable {
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-}
-
-/* ===== PROFILES ===== */
-
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-}
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-.badge-profile-inactive {
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-}
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-}
-
-/* Profile condition editor rows */
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-}
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-}
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-}
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-}
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-    text-align: center;
-}
-
-/* Profile target checklist */
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-    border-radius: 4px;
-    padding: 6px;
-}
-
-.profile-target-item {
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-    gap: 8px;
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-    border-radius: 3px;
-}
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-.profile-target-item:hover {
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-
-.profile-target-item input[type="checkbox"] {
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-}
-
diff --git a/server/src/wled_controller/templates/index.html b/server/src/wled_controller/templates/index.html
new file mode 100644
index 0000000..abf95bd
--- /dev/null
+++ b/server/src/wled_controller/templates/index.html
@@ -0,0 +1,276 @@
+<!DOCTYPE html>
+<html lang="en">
+<head>
+    <meta charset="UTF-8">
+    <meta name="viewport" content="width=device-width, initial-scale=1.0">
+    <title>LED Grab</title>
+    <link rel="icon" href="data:image/svg+xml,<svg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 100 100'><text y='0.9em' font-size='90'>💡</text></svg>">
+    <link rel="stylesheet" href="/static/css/base.css">
+    <link rel="stylesheet" href="/static/css/layout.css">
+    <link rel="stylesheet" href="/static/css/components.css">
+    <link rel="stylesheet" href="/static/css/cards.css">
+    <link rel="stylesheet" href="/static/css/modal.css">
+    <link rel="stylesheet" href="/static/css/calibration.css">
+    <link rel="stylesheet" href="/static/css/dashboard.css">
+    <link rel="stylesheet" href="/static/css/streams.css">
+    <link rel="stylesheet" href="/static/css/patterns.css">
+    <link rel="stylesheet" href="/static/css/profiles.css">
+    <link rel="stylesheet" href="/static/css/tutorials.css">
+    <script src="https://cdn.jsdelivr.net/npm/chart.js@4/dist/chart.umd.min.js"></script>
+</head>
+<body style="visibility: hidden;">
+    <div class="container">
+        <header>
+            <div class="header-title">
+                <span id="server-status" class="status-badge">●</span>
+                <h1 data-i18n="app.title">LED Grab</h1>
+                <span id="server-version"><span id="version-number"></span></span>
+            </div>
+            <div class="server-info">
+                <a href="/docs" target="_blank" class="header-link" data-i18n-title="app.api_docs" title="API Docs">API</a>
+                <button class="theme-toggle" onclick="toggleTheme()" data-i18n-title="theme.toggle" title="Toggle theme">
+                    <span id="theme-icon">🌙</span>
+                </button>
+                <select id="locale-select" onchange="changeLocale()" data-i18n-title="locale.change" title="Change language" style="margin-left: 10px; padding: 6px 12px; border: 1px solid var(--border-color); border-radius: 4px; background: var(--bg-color); color: var(--text-color); font-size: 0.9rem; cursor: pointer;">
+                    <option value="en">English</option>
+                    <option value="ru">Русский</option>
+                </select>
+                <button id="login-btn" class="btn btn-primary" onclick="showLogin()" style="display: none; padding: 6px 16px; font-size: 0.85rem; margin-left: 10px;">
+                    🔑 <span data-i18n="auth.login">Login</span>
+                </button>
+                <button id="logout-btn" class="btn btn-danger" onclick="logout()" style="display: none; padding: 6px 16px; font-size: 0.85rem; margin-left: 10px;">
+                    🚪
+                </button>
+            </div>
+        </header>
+
+        <div class="tabs">
+            <div class="tab-bar">
+                <button class="tab-btn" data-tab="dashboard" onclick="switchTab('dashboard')"><span data-i18n="dashboard.title">📊 Dashboard</span></button>
+                <button class="tab-btn" data-tab="profiles" onclick="switchTab('profiles')"><span data-i18n="profiles.title">📋 Profiles</span></button>
+                <button class="tab-btn" data-tab="targets" onclick="switchTab('targets')"><span data-i18n="targets.title">⚡ Targets</span></button>
+                <button class="tab-btn" data-tab="streams" onclick="switchTab('streams')"><span data-i18n="streams.title">📺 Sources</span></button>
+            </div>
+
+            <div class="tab-panel" id="tab-dashboard">
+                <div id="dashboard-content">
+                    <div class="loading-spinner"></div>
+                </div>
+            </div>
+
+            <div class="tab-panel" id="tab-profiles">
+                <div id="profiles-content">
+                    <div class="loading-spinner"></div>
+                </div>
+            </div>
+
+            <div class="tab-panel" id="tab-targets">
+                <div id="targets-panel-content">
+                    <div class="loading-spinner"></div>
+                </div>
+            </div>
+
+            <div class="tab-panel" id="tab-streams">
+                <div id="streams-list">
+                    <div class="loading-spinner"></div>
+                </div>
+            </div>
+
+            <script>
+                // Apply saved tab immediately during parse to prevent visible jump
+                (function() {
+                    var saved = localStorage.getItem('activeTab');
+                    if (saved === 'devices') saved = 'targets';
+                    if (!saved || !document.getElementById('tab-' + saved)) saved = 'dashboard';
+                    document.querySelectorAll('.tab-btn').forEach(function(btn) { btn.classList.toggle('active', btn.dataset.tab === saved); });
+                    document.querySelectorAll('.tab-panel').forEach(function(panel) { panel.classList.toggle('active', panel.id === 'tab-' + saved); });
+                })();
+            </script>
+        </div>
+
+        <footer class="app-footer">
+            <div class="footer-content">
+                <p>
+                    Created by <strong>Alexei Dolgolyov</strong>
+                    • <a href="mailto:dolgolyov.alexei@gmail.com">dolgolyov.alexei@gmail.com</a>
+                    • <a href="https://git.dolgolyov-family.by/alexei.dolgolyov/wled-screen-controller-mixed" target="_blank" rel="noopener">Source Code</a>
+                </p>
+            </div>
+        </footer>
+    </div>
+
+    <div id="toast" class="toast"></div>
+
+    {% include 'modals/calibration.html' %}
+    {% include 'modals/device-settings.html' %}
+    {% include 'modals/target-editor.html' %}
+    {% include 'modals/kc-editor.html' %}
+    {% include 'modals/pattern-template.html' %}
+    {% include 'modals/api-key.html' %}
+    {% include 'modals/confirm.html' %}
+    {% include 'modals/add-device.html' %}
+    {% include 'modals/capture-template.html' %}
+    {% include 'modals/test-template.html' %}
+    {% include 'modals/test-stream.html' %}
+    {% include 'modals/test-pp-template.html' %}
+    {% include 'modals/stream.html' %}
+    {% include 'modals/pp-template.html' %}
+    {% include 'modals/profile-editor.html' %}
+
+    {% include 'partials/tutorial-overlay.html' %}
+    {% include 'partials/image-lightbox.html' %}
+    {% include 'partials/display-picker.html' %}
+
+    <script type="module" src="/static/js/app.js"></script>
+    <script>
+        // Initialize theme
+        const savedTheme = localStorage.getItem('theme') || 'dark';
+        document.documentElement.setAttribute('data-theme', savedTheme);
+        updateThemeIcon(savedTheme);
+
+        function updateThemeIcon(theme) {
+            const icon = document.getElementById('theme-icon');
+            icon.textContent = theme === 'dark' ? '☀️' : '🌙';
+        }
+
+        function toggleTheme() {
+            const currentTheme = document.documentElement.getAttribute('data-theme');
+            const newTheme = currentTheme === 'dark' ? 'light' : 'dark';
+
+            document.documentElement.setAttribute('data-theme', newTheme);
+            localStorage.setItem('theme', newTheme);
+            updateThemeIcon(newTheme);
+            showToast(`Switched to ${newTheme} theme`, 'info');
+        }
+
+        // Initialize auth state
+        function updateAuthUI() {
+            const apiKey = localStorage.getItem('wled_api_key');
+            const loginBtn = document.getElementById('login-btn');
+            const logoutBtn = document.getElementById('logout-btn');
+            const tabBar = document.querySelector('.tab-bar');
+
+            if (apiKey) {
+                loginBtn.style.display = 'none';
+                logoutBtn.style.display = 'inline-block';
+                if (tabBar) tabBar.style.display = '';
+            } else {
+                loginBtn.style.display = 'inline-block';
+                logoutBtn.style.display = 'none';
+                if (tabBar) tabBar.style.display = 'none';
+            }
+        }
+
+        function showLogin() {
+            showApiKeyModal(t('auth.message'));
+            document.getElementById('modal-cancel-btn').style.display = 'inline-block';
+        }
+
+        async function logout() {
+            const confirmed = await showConfirm(t('auth.logout.confirm'));
+            if (!confirmed) {
+                return;
+            }
+
+            localStorage.removeItem('wled_api_key');
+            if (window.setApiKey) window.setApiKey(null);
+            updateAuthUI();
+            showToast(t('auth.logout.success'), 'info');
+
+            // Stop background activity
+            if (window.stopDashboardWS) window.stopDashboardWS();
+            if (window.stopPerfPolling) window.stopPerfPolling();
+            if (window.stopUptimeTimer) window.stopUptimeTimer();
+            if (window.disconnectAllKCWebSockets) window.disconnectAllKCWebSockets();
+
+            // Clear all tab panels
+            const loginMsg = `<div class="loading">${t('auth.please_login')}</div>`;
+            document.getElementById('dashboard-content').innerHTML = loginMsg;
+            document.getElementById('profiles-content').innerHTML = loginMsg;
+            document.getElementById('targets-panel-content').innerHTML = loginMsg;
+            document.getElementById('streams-list').innerHTML = loginMsg;
+        }
+
+        // Initialize on load
+        updateAuthUI();
+
+        // Modal functions
+        function togglePasswordVisibility() {
+            const input = document.getElementById('api-key-input');
+            const button = document.querySelector('.password-toggle');
+            if (input.type === 'password') {
+                input.type = 'text';
+                button.textContent = '🙈';
+            } else {
+                input.type = 'password';
+                button.textContent = '👁️';
+            }
+        }
+
+        function showApiKeyModal(message, hideCancel = false) {
+            const modal = document.getElementById('api-key-modal');
+            const description = document.querySelector('.modal-description');
+            const input = document.getElementById('api-key-input');
+            const error = document.getElementById('api-key-error');
+            const cancelBtn = document.getElementById('modal-cancel-btn');
+
+            description.textContent = message || t('auth.message');
+
+            input.value = '';
+            input.placeholder = t('auth.placeholder');
+            error.style.display = 'none';
+            modal.style.display = 'flex';
+            lockBody();
+
+            // Hide cancel button and close X if this is required login (no existing session)
+            cancelBtn.style.display = hideCancel ? 'none' : 'inline-block';
+            const closeXBtn = document.getElementById('modal-close-x-btn');
+            if (closeXBtn) closeXBtn.style.display = hideCancel ? 'none' : '';
+
+            // Hide login button while modal is open
+            document.getElementById('login-btn').style.display = 'none';
+
+            setTimeout(() => input.focus(), 100);
+        }
+
+        function closeApiKeyModal() {
+            const modal = document.getElementById('api-key-modal');
+            modal.style.display = 'none';
+            unlockBody();
+            updateAuthUI();
+        }
+
+        function submitApiKey(event) {
+            if (event) {
+                event.preventDefault();
+            }
+
+            const input = document.getElementById('api-key-input');
+            const error = document.getElementById('api-key-error');
+            const key = input.value.trim();
+
+            if (!key) {
+                error.textContent = t('auth.error.required');
+                error.style.display = 'block';
+                return;
+            }
+
+            // Store the key
+            localStorage.setItem('wled_api_key', key);
+            if (window.setApiKey) window.setApiKey(key);
+            updateAuthUI();
+
+            closeApiKeyModal();
+            showToast(t('auth.success'), 'success');
+
+            // Reload data
+            loadServerInfo();
+            loadDisplays();
+            loadTargetsTab();
+
+            // Start auto-refresh
+            startAutoRefresh();
+        }
+    </script>
+</body>
+</html>
diff --git a/server/src/wled_controller/templates/modals/add-device.html b/server/src/wled_controller/templates/modals/add-device.html
new file mode 100644
index 0000000..3a27959
--- /dev/null
+++ b/server/src/wled_controller/templates/modals/add-device.html
@@ -0,0 +1,89 @@
+<!-- Add Device Modal -->
+<div id="add-device-modal" class="modal">
+    <div class="modal-content">
+        <div class="modal-header">
+            <h2 data-i18n="devices.add">Add New Device</h2>
+            <div class="modal-header-actions">
+                <button type="button" class="modal-header-btn" id="scan-network-btn" onclick="scanForDevices()" data-i18n-title="device.scan" title="Auto Discovery">&#x1F50D;</button>
+                <button class="modal-close-btn" onclick="closeAddDeviceModal()" title="Close">&#x2715;</button>
+            </div>
+        </div>
+        <div class="modal-body">
+            <div id="discovery-section" class="discovery-section" style="display: none;">
+                <div id="discovery-loading" class="discovery-loading" style="display: none;">
+                    <span class="discovery-spinner"></span>
+                </div>
+                <div id="discovery-list" class="discovery-list"></div>
+                <div id="discovery-empty" style="display: none;">
+                    <small data-i18n="device.scan.empty">No devices found</small>
+                </div>
+                <hr class="modal-divider">
+            </div>
+            <form id="add-device-form">
+                <div class="form-group">
+                    <div class="label-row">
+                        <label for="device-type" data-i18n="device.type">Device Type:</label>
+                        <button type="button" class="hint-toggle" onclick="toggleHint(this)" title="?">?</button>
+                    </div>
+                    <small class="input-hint" style="display:none" data-i18n="device.type.hint">Select the type of LED controller</small>
+                    <select id="device-type" onchange="onDeviceTypeChanged()">
+                        <option value="wled">WLED</option>
+                        <option value="adalight">Adalight</option>
+                        <option value="ambiled">AmbiLED</option>
+                    </select>
+                </div>
+                <div class="form-group">
+                    <label for="device-name" data-i18n="device.name">Device Name:</label>
+                    <input type="text" id="device-name" data-i18n-placeholder="device.name.placeholder" placeholder="Living Room TV" required>
+                </div>
+                <div class="form-group" id="device-url-group">
+                    <div class="label-row">
+                        <label for="device-url" id="device-url-label" data-i18n="device.url">URL:</label>
+                        <button type="button" class="hint-toggle" onclick="toggleHint(this)" title="?">?</button>
+                    </div>
+                    <small class="input-hint" style="display:none" id="device-url-hint" data-i18n="device.url.hint">IP address or hostname of the device (e.g. http://192.168.1.100)</small>
+                    <input type="text" id="device-url" data-i18n-placeholder="device.url.placeholder" placeholder="http://192.168.1.100" required>
+                </div>
+                <div class="form-group" id="device-serial-port-group" style="display: none;">
+                    <div class="label-row">
+                        <label for="device-serial-port" id="device-serial-port-label" data-i18n="device.serial_port">Serial Port:</label>
+                        <button type="button" class="hint-toggle" onclick="toggleHint(this)" title="?">?</button>
+                    </div>
+                    <small class="input-hint" style="display:none" data-i18n="device.serial_port.hint">Select the COM port of the Adalight device</small>
+                    <select id="device-serial-port" onfocus="onSerialPortFocus()"></select>
+                </div>
+                <div class="form-group" id="device-led-count-group" style="display: none;">
+                    <div class="label-row">
+                        <label for="device-led-count" data-i18n="device.led_count">LED Count:</label>
+                        <button type="button" class="hint-toggle" onclick="toggleHint(this)" title="?">?</button>
+                    </div>
+                    <small class="input-hint" style="display:none" data-i18n="device.led_count_manual.hint">Number of LEDs on the strip (must match your Arduino sketch)</small>
+                    <input type="number" id="device-led-count" min="1" max="10000" placeholder="60" oninput="updateBaudFpsHint()">
+                </div>
+                <div class="form-group" id="device-baud-rate-group" style="display: none;">
+                    <div class="label-row">
+                        <label for="device-baud-rate" data-i18n="device.baud_rate">Baud Rate:</label>
+                        <button type="button" class="hint-toggle" onclick="toggleHint(this)" title="?">?</button>
+                    </div>
+                    <small class="input-hint" style="display:none" data-i18n="device.baud_rate.hint">Serial communication speed. Higher = more FPS but requires matching Arduino sketch.</small>
+                    <select id="device-baud-rate" onchange="updateBaudFpsHint()">
+                        <option value="115200">115200</option>
+                        <option value="230400">230400</option>
+                        <option value="460800">460800</option>
+                        <option value="500000">500000</option>
+                        <option value="921600">921600</option>
+                        <option value="1000000">1000000</option>
+                        <option value="1500000">1500000</option>
+                        <option value="2000000">2000000</option>
+                    </select>
+                    <small id="baud-fps-hint" class="fps-hint" style="display:none"></small>
+                </div>
+                <div id="add-device-error" class="error-message" style="display: none;"></div>
+            </form>
+        </div>
+        <div class="modal-footer">
+            <button class="btn btn-icon btn-secondary" onclick="closeAddDeviceModal()" title="Cancel">&#x2715;</button>
+            <button class="btn btn-icon btn-primary" onclick="document.getElementById('add-device-form').requestSubmit()" title="Add Device">&#x2713;</button>
+        </div>
+    </div>
+</div>
diff --git a/server/src/wled_controller/templates/modals/api-key.html b/server/src/wled_controller/templates/modals/api-key.html
new file mode 100644
index 0000000..b09f164
--- /dev/null
+++ b/server/src/wled_controller/templates/modals/api-key.html
@@ -0,0 +1,40 @@
+<!-- Login Modal -->
+<div id="api-key-modal" class="modal">
+    <div class="modal-content">
+        <div class="modal-header">
+            <h2 data-i18n="auth.title">🔑 Login to LED Grab</h2>
+            <button class="modal-close-btn" id="modal-close-x-btn" onclick="closeApiKeyModal()" title="Close">&#x2715;</button>
+        </div>
+        <form id="api-key-form" onsubmit="submitApiKey(event)">
+            <div class="modal-body">
+                <p class="modal-description" data-i18n="auth.message">
+                    Please enter your API key to authenticate and access the LED Grab.
+                </p>
+                <div class="form-group">
+                    <div class="label-row">
+                        <label for="api-key-input" data-i18n="auth.label">API Key:</label>
+                        <button type="button" class="hint-toggle" onclick="toggleHint(this)" title="?">?</button>
+                    </div>
+                    <small class="input-hint" style="display:none" data-i18n="auth.hint">Your API key will be stored securely in your browser's local storage.</small>
+                    <div class="password-input-wrapper">
+                        <input
+                            type="password"
+                            id="api-key-input"
+                            data-i18n-placeholder="auth.placeholder"
+                            placeholder="Enter your API key..."
+                            autocomplete="off"
+                        >
+                        <button type="button" class="password-toggle" onclick="togglePasswordVisibility()">
+                            👁️
+                        </button>
+                    </div>
+                </div>
+                <div id="api-key-error" class="error-message" style="display: none;"></div>
+            </div>
+            <div class="modal-footer">
+                <button type="button" class="btn btn-icon btn-secondary" onclick="closeApiKeyModal()" id="modal-cancel-btn" title="Cancel">&#x2715;</button>
+                <button type="submit" class="btn btn-icon btn-primary" title="Login">&#x2713;</button>
+            </div>
+        </form>
+    </div>
+</div>
diff --git a/server/src/wled_controller/templates/modals/calibration.html b/server/src/wled_controller/templates/modals/calibration.html
new file mode 100644
index 0000000..ded8a84
--- /dev/null
+++ b/server/src/wled_controller/templates/modals/calibration.html
@@ -0,0 +1,144 @@
+<!-- Calibration Modal -->
+<div id="calibration-modal" class="modal">
+    <div class="modal-content" style="max-width: 700px;">
+        <div class="modal-header">
+            <h2 data-i18n="calibration.title">📐 LED Calibration</h2>
+            <button class="tutorial-trigger-btn" onclick="startCalibrationTutorial()" data-i18n-title="calibration.tutorial.start" title="Start tutorial">?</button>
+            <button class="modal-close-btn" onclick="closeCalibrationModal()" title="Close">&#x2715;</button>
+        </div>
+        <div class="modal-body">
+            <input type="hidden" id="calibration-device-id">
+            <!-- Interactive Preview with integrated LED inputs and test toggles -->
+            <div style="margin-bottom: 12px; padding: 0 24px;">
+                <div class="calibration-preview">
+                    <!-- Screen with direction toggle, total LEDs, and offset -->
+                    <div class="preview-screen">
+                        <button type="button" class="direction-toggle" onclick="toggleDirection()" title="Toggle direction">
+                            <span id="direction-icon">↻</span> <span id="direction-label">CW</span>
+                        </button>
+                        <div class="preview-screen-total" onclick="toggleEdgeInputs()" title="Toggle edge LED inputs"><span id="cal-total-leds-inline">0</span> / <span id="cal-device-led-count-inline">0</span></div>
+                        <div class="preview-screen-border-width">
+                            <label for="cal-border-width" data-i18n="calibration.border_width">Border (px):</label>
+                            <input type="number" id="cal-border-width" min="1" max="100" value="10">
+                        </div>
+                    </div>
+
+                    <!-- Edge bars with span controls and LED count inputs -->
+                    <div class="preview-edge edge-top">
+                        <div class="edge-span-bar" data-edge="top">
+                            <div class="edge-span-handle edge-span-handle-start" data-edge="top" data-handle="start"></div>
+                            <div class="edge-span-handle edge-span-handle-end" data-edge="top" data-handle="end"></div>
+                        </div>
+                        <input type="number" id="cal-top-leds" class="edge-led-input" min="0" value="0"
+                               oninput="updateCalibrationPreview()">
+                    </div>
+                    <div class="preview-edge edge-right">
+                        <div class="edge-span-bar" data-edge="right">
+                            <div class="edge-span-handle edge-span-handle-start" data-edge="right" data-handle="start"></div>
+                            <div class="edge-span-handle edge-span-handle-end" data-edge="right" data-handle="end"></div>
+                        </div>
+                        <input type="number" id="cal-right-leds" class="edge-led-input" min="0" value="0"
+                               oninput="updateCalibrationPreview()">
+                    </div>
+                    <div class="preview-edge edge-bottom">
+                        <div class="edge-span-bar" data-edge="bottom">
+                            <div class="edge-span-handle edge-span-handle-start" data-edge="bottom" data-handle="start"></div>
+                            <div class="edge-span-handle edge-span-handle-end" data-edge="bottom" data-handle="end"></div>
+                        </div>
+                        <input type="number" id="cal-bottom-leds" class="edge-led-input" min="0" value="0"
+                               oninput="updateCalibrationPreview()">
+                    </div>
+                    <div class="preview-edge edge-left">
+                        <div class="edge-span-bar" data-edge="left">
+                            <div class="edge-span-handle edge-span-handle-start" data-edge="left" data-handle="start"></div>
+                            <div class="edge-span-handle edge-span-handle-end" data-edge="left" data-handle="end"></div>
+                        </div>
+                        <input type="number" id="cal-left-leds" class="edge-led-input" min="0" value="0"
+                               oninput="updateCalibrationPreview()">
+                    </div>
+
+                    <!-- Edge test toggle zones (outside container border, in tick area) -->
+                    <div class="edge-toggle toggle-top" onclick="toggleTestEdge('top')"></div>
+                    <div class="edge-toggle toggle-right" onclick="toggleTestEdge('right')"></div>
+                    <div class="edge-toggle toggle-bottom" onclick="toggleTestEdge('bottom')"></div>
+                    <div class="edge-toggle toggle-left" onclick="toggleTestEdge('left')"></div>
+
+                    <!-- Corner start position buttons -->
+                    <div class="preview-corner corner-top-left" onclick="setStartPosition('top_left')">●</div>
+                    <div class="preview-corner corner-top-right" onclick="setStartPosition('top_right')">●</div>
+                    <div class="preview-corner corner-bottom-left" onclick="setStartPosition('bottom_left')">●</div>
+                    <div class="preview-corner corner-bottom-right" onclick="setStartPosition('bottom_right')">●</div>
+
+                    <!-- Canvas overlay for ticks, arrows, start label -->
+                    <canvas id="calibration-preview-canvas"></canvas>
+                </div>
+            </div>
+
+            <!-- Hidden selects (used by saveCalibration) -->
+            <div style="display: none;">
+                <select id="cal-start-position">
+                    <option value="bottom_left">Bottom Left</option>
+                    <option value="bottom_right">Bottom Right</option>
+                    <option value="top_left">Top Left</option>
+                    <option value="top_right">Top Right</option>
+                </select>
+                <select id="cal-layout">
+                    <option value="clockwise">Clockwise</option>
+                    <option value="counterclockwise">Counterclockwise</option>
+                </select>
+            </div>
+
+
+            <!-- Offset & Skip LEDs -->
+            <div style="display: grid; grid-template-columns: 1fr 1fr 1fr; gap: 16px; padding: 0 24px;">
+                <div class="form-group">
+                    <div class="label-row">
+                        <label for="cal-offset" data-i18n="calibration.offset">LED Offset:</label>
+                        <button type="button" class="hint-toggle" onclick="toggleHint(this)" title="?">?</button>
+                    </div>
+                    <small class="input-hint" style="display:none" data-i18n="calibration.offset.hint">Distance from physical LED 0 to the start corner (along strip direction)</small>
+                    <input type="number" id="cal-offset" min="0" value="0" oninput="updateOffsetSkipLock(); updateCalibrationPreview()">
+                </div>
+                <div class="form-group">
+                    <div class="label-row">
+                        <label for="cal-skip-start" data-i18n="calibration.skip_start">Skip LEDs (Start):</label>
+                        <button type="button" class="hint-toggle" onclick="toggleHint(this)" title="?">?</button>
+                    </div>
+                    <small class="input-hint" style="display:none" data-i18n="calibration.skip_start.hint">Number of LEDs to turn off at the beginning of the strip (0 = none)</small>
+                    <input type="number" id="cal-skip-start" min="0" value="0" oninput="updateOffsetSkipLock(); updateCalibrationPreview()">
+                </div>
+                <div class="form-group">
+                    <div class="label-row">
+                        <label for="cal-skip-end" data-i18n="calibration.skip_end">Skip LEDs (End):</label>
+                        <button type="button" class="hint-toggle" onclick="toggleHint(this)" title="?">?</button>
+                    </div>
+                    <small class="input-hint" style="display:none" data-i18n="calibration.skip_end.hint">Number of LEDs to turn off at the end of the strip (0 = none)</small>
+                    <input type="number" id="cal-skip-end" min="0" value="0" oninput="updateOffsetSkipLock(); updateCalibrationPreview()">
+                </div>
+            </div>
+
+            <!-- Tutorial Overlay -->
+            <div id="tutorial-overlay" class="tutorial-overlay">
+                <div class="tutorial-backdrop"></div>
+                <div class="tutorial-ring"></div>
+                <div class="tutorial-tooltip">
+                    <div class="tutorial-tooltip-header">
+                        <span class="tutorial-step-counter"></span>
+                        <button class="tutorial-close-btn" onclick="closeTutorial()">&times;</button>
+                    </div>
+                    <p class="tutorial-tooltip-text"></p>
+                    <div class="tutorial-tooltip-nav">
+                        <button class="tutorial-prev-btn" onclick="tutorialPrev()">&#8592;</button>
+                        <button class="tutorial-next-btn" onclick="tutorialNext()">&#8594;</button>
+                    </div>
+                </div>
+            </div>
+
+            <div id="calibration-error" class="error-message" style="display: none;"></div>
+        </div>
+        <div class="modal-footer">
+            <button class="btn btn-icon btn-secondary" onclick="closeCalibrationModal()" title="Cancel">&#x2715;</button>
+            <button class="btn btn-icon btn-primary" onclick="saveCalibration()" title="Save">&#x2713;</button>
+        </div>
+    </div>
+</div>
diff --git a/server/src/wled_controller/templates/modals/capture-template.html b/server/src/wled_controller/templates/modals/capture-template.html
new file mode 100644
index 0000000..5e86374
--- /dev/null
+++ b/server/src/wled_controller/templates/modals/capture-template.html
@@ -0,0 +1,45 @@
+<!-- Template Modal -->
+<div id="template-modal" class="modal">
+    <div class="modal-content">
+        <div class="modal-header">
+            <h2 id="template-modal-title" data-i18n="templates.add">Add Capture Template</h2>
+            <button class="modal-close-btn" onclick="closeTemplateModal()" title="Close">&#x2715;</button>
+        </div>
+        <div class="modal-body">
+            <input type="hidden" id="template-id">
+            <form id="template-form">
+                <div class="form-group">
+                    <label for="template-name" data-i18n="templates.name">Template Name:</label>
+                    <input type="text" id="template-name" data-i18n-placeholder="templates.name.placeholder" placeholder="My Custom Template" required>
+                </div>
+
+                <div class="form-group">
+                    <label for="template-description" data-i18n="templates.description.label">Description (optional):</label>
+                    <input type="text" id="template-description" data-i18n-placeholder="templates.description.placeholder" placeholder="Describe this template..." maxlength="500">
+                </div>
+
+                <div class="form-group">
+                    <div class="label-row">
+                        <label for="template-engine" data-i18n="templates.engine">Capture Engine:</label>
+                        <button type="button" class="hint-toggle" onclick="toggleHint(this)" title="?">?</button>
+                    </div>
+                    <small class="input-hint" style="display:none" data-i18n="templates.engine.hint">Select the screen capture technology to use</small>
+                    <select id="template-engine" onchange="onEngineChange()" required>
+                    </select>
+                    <small id="engine-availability-hint" class="form-hint" style="display: none;"></small>
+                </div>
+
+                <div id="engine-config-section" style="display: none;">
+                    <h3 data-i18n="templates.config">Configuration</h3>
+                    <div id="engine-config-fields"></div>
+                </div>
+
+                <div id="template-error" class="error-message" style="display: none;"></div>
+            </form>
+        </div>
+        <div class="modal-footer">
+            <button class="btn btn-icon btn-secondary" onclick="closeTemplateModal()" title="Cancel">&#x2715;</button>
+            <button class="btn btn-icon btn-primary" onclick="saveTemplate()" title="Save">&#x2713;</button>
+        </div>
+    </div>
+</div>
diff --git a/server/src/wled_controller/templates/modals/confirm.html b/server/src/wled_controller/templates/modals/confirm.html
new file mode 100644
index 0000000..ee1e5a0
--- /dev/null
+++ b/server/src/wled_controller/templates/modals/confirm.html
@@ -0,0 +1,16 @@
+<!-- Confirmation Modal -->
+<div id="confirm-modal" class="modal">
+    <div class="modal-content" style="max-width: 450px;">
+        <div class="modal-header">
+            <h2 id="confirm-title">Confirm Action</h2>
+            <button class="modal-close-btn" onclick="closeConfirmModal(false)" title="Close">&#x2715;</button>
+        </div>
+        <div class="modal-body">
+            <p id="confirm-message" class="modal-description"></p>
+        </div>
+        <div class="modal-footer">
+            <button class="btn btn-danger" id="confirm-no-btn" onclick="closeConfirmModal(false)">No</button>
+            <button class="btn btn-secondary" id="confirm-yes-btn" onclick="closeConfirmModal(true)">Yes</button>
+        </div>
+    </div>
+</div>
diff --git a/server/src/wled_controller/templates/modals/device-settings.html b/server/src/wled_controller/templates/modals/device-settings.html
new file mode 100644
index 0000000..43531bc
--- /dev/null
+++ b/server/src/wled_controller/templates/modals/device-settings.html
@@ -0,0 +1,90 @@
+<!-- General Settings Modal -->
+<div id="device-settings-modal" class="modal">
+    <div class="modal-content">
+        <div class="modal-header">
+            <h2 data-i18n="settings.general.title">⚙️ General Settings</h2>
+            <button class="modal-close-btn" onclick="closeDeviceSettingsModal()" title="Close">&#x2715;</button>
+        </div>
+        <div class="modal-body">
+            <form id="device-settings-form">
+                <input type="hidden" id="settings-device-id">
+
+                <div class="form-group">
+                    <label for="settings-device-name" data-i18n="device.name">Device Name:</label>
+                    <input type="text" id="settings-device-name" data-i18n-placeholder="device.name.placeholder" placeholder="Living Room TV" required>
+                </div>
+
+                <div class="form-group" id="settings-url-group">
+                    <div class="label-row">
+                        <label for="settings-device-url" data-i18n="device.url">URL:</label>
+                        <button type="button" class="hint-toggle" onclick="toggleHint(this)" title="?">?</button>
+                    </div>
+                    <small class="input-hint" style="display:none" data-i18n="settings.url.hint">IP address or hostname of the device</small>
+                    <input type="text" id="settings-device-url" data-i18n-placeholder="device.url.placeholder" placeholder="http://192.168.1.100" required>
+                </div>
+                <div class="form-group" id="settings-serial-port-group" style="display: none;">
+                    <div class="label-row">
+                        <label for="settings-serial-port" data-i18n="device.serial_port">Serial Port:</label>
+                        <button type="button" class="hint-toggle" onclick="toggleHint(this)" title="?">?</button>
+                    </div>
+                    <small class="input-hint" style="display:none" data-i18n="device.serial_port.hint">Select the COM port of the Adalight device</small>
+                    <select id="settings-serial-port"></select>
+                </div>
+
+                <div class="form-group" id="settings-led-count-group" style="display: none;">
+                    <div class="label-row">
+                        <label for="settings-led-count" data-i18n="device.led_count">LED Count:</label>
+                        <button type="button" class="hint-toggle" onclick="toggleHint(this)" title="?">?</button>
+                    </div>
+                    <small class="input-hint" style="display:none" data-i18n="device.led_count_manual.hint">Number of LEDs on the strip (must match your Arduino sketch)</small>
+                    <input type="number" id="settings-led-count" min="1" max="10000" oninput="updateSettingsBaudFpsHint()">
+                </div>
+                <div class="form-group" id="settings-baud-rate-group" style="display: none;">
+                    <div class="label-row">
+                        <label for="settings-baud-rate" data-i18n="device.baud_rate">Baud Rate:</label>
+                        <button type="button" class="hint-toggle" onclick="toggleHint(this)" title="?">?</button>
+                    </div>
+                    <small class="input-hint" style="display:none" data-i18n="device.baud_rate.hint">Serial communication speed. Higher = more FPS but requires matching Arduino sketch.</small>
+                    <select id="settings-baud-rate" onchange="updateSettingsBaudFpsHint()">
+                        <option value="115200">115200</option>
+                        <option value="230400">230400</option>
+                        <option value="460800">460800</option>
+                        <option value="500000">500000</option>
+                        <option value="921600">921600</option>
+                        <option value="1000000">1000000</option>
+                        <option value="1500000">1500000</option>
+                        <option value="2000000">2000000</option>
+                    </select>
+                    <small id="settings-baud-fps-hint" class="fps-hint" style="display:none"></small>
+                </div>
+
+                <div class="form-group">
+                    <div class="label-row">
+                        <label for="settings-health-interval" data-i18n="settings.health_interval">Health Check Interval (s):</label>
+                        <button type="button" class="hint-toggle" onclick="toggleHint(this)" title="?">?</button>
+                    </div>
+                    <small class="input-hint" style="display:none" data-i18n="settings.health_interval.hint">How often to check the device status (5-600 seconds)</small>
+                    <input type="number" id="settings-health-interval" min="5" max="600" value="30">
+                </div>
+
+                <div class="form-group settings-toggle-group">
+                    <div class="label-row">
+                        <label data-i18n="settings.auto_shutdown">Auto Restore:</label>
+                        <button type="button" class="hint-toggle" onclick="toggleHint(this)" title="?">?</button>
+                    </div>
+                    <small class="input-hint" style="display:none" data-i18n="settings.auto_shutdown.hint">Restore device to idle state when targets stop or server shuts down</small>
+                    <label class="settings-toggle">
+                        <input type="checkbox" id="settings-auto-shutdown">
+                        <span class="settings-toggle-slider"></span>
+                    </label>
+                </div>
+
+                <div id="settings-error" class="error-message" style="display: none;"></div>
+            </form>
+        </div>
+        <div class="modal-footer">
+            <button class="btn btn-icon btn-secondary" onclick="closeDeviceSettingsModal()" title="Cancel">&#x2715;</button>
+            <button class="btn btn-icon btn-primary" onclick="saveDeviceSettings()" title="Save">&#x2713;</button>
+        </div>
+    </div>
+</div>
diff --git a/server/src/wled_controller/templates/modals/kc-editor.html b/server/src/wled_controller/templates/modals/kc-editor.html
new file mode 100644
index 0000000..4b1564c
--- /dev/null
+++ b/server/src/wled_controller/templates/modals/kc-editor.html
@@ -0,0 +1,80 @@
+<!-- Key Colors Editor Modal -->
+<div id="kc-editor-modal" class="modal">
+    <div class="modal-content">
+        <div class="modal-header">
+            <h2 id="kc-editor-title" data-i18n="kc.add">🎨 Add Key Colors Target</h2>
+            <button class="modal-close-btn" onclick="closeKCEditorModal()" title="Close">&#x2715;</button>
+        </div>
+        <div class="modal-body">
+            <form id="kc-editor-form">
+                <input type="hidden" id="kc-editor-id">
+
+                <div class="form-group">
+                    <label for="kc-editor-name" data-i18n="kc.name">Target Name:</label>
+                    <input type="text" id="kc-editor-name" data-i18n-placeholder="kc.name.placeholder" placeholder="My Key Colors Target" required>
+                </div>
+
+                <div class="form-group">
+                    <div class="label-row">
+                        <label for="kc-editor-source" data-i18n="kc.source">Picture Source:</label>
+                        <button type="button" class="hint-toggle" onclick="toggleHint(this)" title="?">?</button>
+                    </div>
+                    <small class="input-hint" style="display:none" data-i18n="kc.source.hint">Which picture source to extract colors from</small>
+                    <select id="kc-editor-source"></select>
+                </div>
+
+                <div class="form-group">
+                    <div class="label-row">
+                        <label for="kc-editor-pattern-template" data-i18n="kc.pattern_template">Pattern Template:</label>
+                        <button type="button" class="hint-toggle" onclick="toggleHint(this)" title="?">?</button>
+                    </div>
+                    <small class="input-hint" style="display:none" data-i18n="kc.pattern_template.hint">Select the rectangle pattern to use for color extraction</small>
+                    <select id="kc-editor-pattern-template"></select>
+                </div>
+
+                <div class="form-group">
+                    <div class="label-row">
+                        <label for="kc-editor-fps" data-i18n="kc.fps">Extraction FPS:</label>
+                        <button type="button" class="hint-toggle" onclick="toggleHint(this)" title="?">?</button>
+                    </div>
+                    <small class="input-hint" style="display:none" data-i18n="kc.fps.hint">How many times per second to extract colors (1-60)</small>
+                    <div class="slider-row">
+                        <input type="range" id="kc-editor-fps" min="1" max="60" value="10" oninput="document.getElementById('kc-editor-fps-value').textContent = this.value">
+                        <span id="kc-editor-fps-value" class="slider-value">10</span>
+                    </div>
+                </div>
+
+                <div class="form-group">
+                    <div class="label-row">
+                        <label for="kc-editor-interpolation" data-i18n="kc.interpolation">Color Mode:</label>
+                        <button type="button" class="hint-toggle" onclick="toggleHint(this)" title="?">?</button>
+                    </div>
+                    <small class="input-hint" style="display:none" data-i18n="kc.interpolation.hint">How to compute the key color from pixels in each rectangle</small>
+                    <select id="kc-editor-interpolation">
+                        <option value="average">Average</option>
+                        <option value="median">Median</option>
+                        <option value="dominant">Dominant</option>
+                    </select>
+                </div>
+
+                <div class="form-group">
+                    <div class="label-row">
+                        <label for="kc-editor-smoothing">
+                            <span data-i18n="kc.smoothing">Smoothing:</span>
+                            <span id="kc-editor-smoothing-value">0.3</span>
+                        </label>
+                        <button type="button" class="hint-toggle" onclick="toggleHint(this)" title="?">?</button>
+                    </div>
+                    <small class="input-hint" style="display:none" data-i18n="kc.smoothing.hint">Temporal blending between extractions (0=none, 1=full)</small>
+                    <input type="range" id="kc-editor-smoothing" min="0.0" max="1.0" step="0.05" value="0.3" oninput="document.getElementById('kc-editor-smoothing-value').textContent = this.value">
+                </div>
+
+                <div id="kc-editor-error" class="error-message" style="display: none;"></div>
+            </form>
+        </div>
+        <div class="modal-footer">
+            <button class="btn btn-icon btn-secondary" onclick="closeKCEditorModal()" title="Cancel">&#x2715;</button>
+            <button class="btn btn-icon btn-primary" onclick="saveKCEditor()" title="Save">&#x2713;</button>
+        </div>
+    </div>
+</div>
diff --git a/server/src/wled_controller/templates/modals/pattern-template.html b/server/src/wled_controller/templates/modals/pattern-template.html
new file mode 100644
index 0000000..a5bbe48
--- /dev/null
+++ b/server/src/wled_controller/templates/modals/pattern-template.html
@@ -0,0 +1,67 @@
+<!-- Pattern Template Editor Modal -->
+<div id="pattern-template-modal" class="modal">
+    <div class="modal-content modal-content-wide">
+        <div class="modal-header">
+            <h2 id="pattern-template-title" data-i18n="pattern.add">📄 Add Pattern Template</h2>
+            <button class="modal-close-btn" onclick="closePatternTemplateModal()" title="Close">&#x2715;</button>
+        </div>
+        <div class="modal-body">
+            <form id="pattern-template-form">
+                <input type="hidden" id="pattern-template-id">
+
+                <div class="form-group">
+                    <div class="label-row">
+                        <label for="pattern-template-name" data-i18n="pattern.name">Template Name:</label>
+                        <button type="button" class="hint-toggle" onclick="toggleHint(this)" title="?">?</button>
+                    </div>
+                    <small class="input-hint" style="display:none" data-i18n="pattern.name.hint">A descriptive name for this rectangle layout</small>
+                    <input type="text" id="pattern-template-name" data-i18n-placeholder="pattern.name.placeholder" placeholder="My Pattern Template" required>
+                </div>
+
+                <div class="form-group">
+                    <div class="label-row">
+                        <label for="pattern-template-description" data-i18n="pattern.description_label">Description (optional):</label>
+                        <button type="button" class="hint-toggle" onclick="toggleHint(this)" title="?">?</button>
+                    </div>
+                    <small class="input-hint" style="display:none" data-i18n="pattern.description.hint">Optional notes about where or how this pattern is used</small>
+                    <input type="text" id="pattern-template-description" data-i18n-placeholder="pattern.description_placeholder" placeholder="Describe this pattern...">
+                </div>
+
+                <!-- Visual Editor -->
+                <div class="form-group">
+                    <div class="label-row">
+                        <label data-i18n="pattern.visual_editor">Visual Editor</label>
+                        <button type="button" class="hint-toggle" onclick="toggleHint(this)" title="?">?</button>
+                    </div>
+                    <small class="input-hint" style="display:none" data-i18n="pattern.visual_editor.hint">Click + buttons to add rectangles. Drag edges to resize, drag inside to move.</small>
+                    <div class="pattern-bg-row">
+                        <select id="pattern-bg-source"></select>
+                        <button type="button" class="btn btn-icon btn-secondary pattern-capture-btn" onclick="capturePatternBackground()" title="Capture Background" data-i18n-title="pattern.capture_bg">📷</button>
+                    </div>
+                    <div class="pattern-canvas-container">
+                        <canvas id="pattern-canvas"></canvas>
+                    </div>
+                </div>
+
+                <!-- Precise coordinate list -->
+                <div class="form-group">
+                    <div id="pattern-rect-labels" class="pattern-rect-labels">
+                        <span data-i18n="pattern.rect.name">Name</span>
+                        <span data-i18n="pattern.rect.x">X</span>
+                        <span data-i18n="pattern.rect.y">Y</span>
+                        <span data-i18n="pattern.rect.width">W</span>
+                        <span data-i18n="pattern.rect.height">H</span>
+                        <span></span>
+                    </div>
+                    <div id="pattern-rect-list" class="pattern-rect-list"></div>
+                </div>
+
+                <div id="pattern-template-error" class="error-message" style="display: none;"></div>
+            </form>
+        </div>
+        <div class="modal-footer">
+            <button class="btn btn-icon btn-secondary" onclick="closePatternTemplateModal()" title="Cancel">&#x2715;</button>
+            <button class="btn btn-icon btn-primary" onclick="savePatternTemplate()" title="Save">&#x2713;</button>
+        </div>
+    </div>
+</div>
diff --git a/server/src/wled_controller/templates/modals/pp-template.html b/server/src/wled_controller/templates/modals/pp-template.html
new file mode 100644
index 0000000..9d08124
--- /dev/null
+++ b/server/src/wled_controller/templates/modals/pp-template.html
@@ -0,0 +1,40 @@
+<!-- Processing Template Modal -->
+<div id="pp-template-modal" class="modal">
+    <div class="modal-content">
+        <div class="modal-header">
+            <h2 id="pp-template-modal-title" data-i18n="postprocessing.add">Add Processing Template</h2>
+            <button class="modal-close-btn" onclick="closePPTemplateModal()" title="Close">&#x2715;</button>
+        </div>
+        <div class="modal-body">
+            <input type="hidden" id="pp-template-id">
+            <form id="pp-template-form">
+                <div class="form-group">
+                    <label for="pp-template-name" data-i18n="postprocessing.name">Template Name:</label>
+                    <input type="text" id="pp-template-name" data-i18n-placeholder="postprocessing.name.placeholder" placeholder="My Processing Template" required>
+                </div>
+
+                <!-- Dynamic filter list -->
+                <div id="pp-filter-list" class="pp-filter-list"></div>
+
+                <!-- Add filter control -->
+                <div class="pp-add-filter-row">
+                    <select id="pp-add-filter-select" class="pp-add-filter-select">
+                        <option value="" data-i18n="filters.select_type">Select filter type...</option>
+                    </select>
+                    <button type="button" class="pp-add-filter-btn" onclick="addFilterFromSelect()" title="Add Filter">+</button>
+                </div>
+
+                <div class="form-group">
+                    <label for="pp-template-description" data-i18n="postprocessing.description_label">Description (optional):</label>
+                    <input type="text" id="pp-template-description" data-i18n-placeholder="postprocessing.description_placeholder" placeholder="Describe this template...">
+                </div>
+
+                <div id="pp-template-error" class="error-message" style="display: none;"></div>
+            </form>
+        </div>
+        <div class="modal-footer">
+            <button class="btn btn-icon btn-secondary" onclick="closePPTemplateModal()" title="Cancel">&#x2715;</button>
+            <button class="btn btn-icon btn-primary" onclick="savePPTemplate()" title="Save">&#x2713;</button>
+        </div>
+    </div>
+</div>
diff --git a/server/src/wled_controller/templates/modals/profile-editor.html b/server/src/wled_controller/templates/modals/profile-editor.html
new file mode 100644
index 0000000..2d14754
--- /dev/null
+++ b/server/src/wled_controller/templates/modals/profile-editor.html
@@ -0,0 +1,74 @@
+<!-- Profile Editor Modal -->
+<div id="profile-editor-modal" class="modal">
+    <div class="modal-content">
+        <div class="modal-header">
+            <h2 id="profile-editor-title" data-i18n="profiles.add">📋 Add Profile</h2>
+            <button class="modal-close-btn" onclick="closeProfileEditorModal()" title="Close">&#x2715;</button>
+        </div>
+        <div class="modal-body">
+            <form id="profile-editor-form">
+                <input type="hidden" id="profile-editor-id">
+
+                <div class="form-group">
+                    <div class="label-row">
+                        <label for="profile-editor-name" data-i18n="profiles.name">Name:</label>
+                        <button type="button" class="hint-toggle" onclick="toggleHint(this)" title="?">?</button>
+                    </div>
+                    <small class="input-hint" style="display:none" data-i18n="profiles.name.hint">A descriptive name for this profile</small>
+                    <input type="text" id="profile-editor-name" required>
+                </div>
+
+                <div class="form-group settings-toggle-group">
+                    <div class="label-row">
+                        <label data-i18n="profiles.enabled">Enabled:</label>
+                        <button type="button" class="hint-toggle" onclick="toggleHint(this)" title="?">?</button>
+                    </div>
+                    <small class="input-hint" style="display:none" data-i18n="profiles.enabled.hint">Disabled profiles won't activate even when conditions are met</small>
+                    <label class="settings-toggle">
+                        <input type="checkbox" id="profile-editor-enabled" checked>
+                        <span class="settings-toggle-slider"></span>
+                    </label>
+                </div>
+
+                <div class="form-group">
+                    <div class="label-row">
+                        <label for="profile-editor-logic" data-i18n="profiles.condition_logic">Condition Logic:</label>
+                        <button type="button" class="hint-toggle" onclick="toggleHint(this)" title="?">?</button>
+                    </div>
+                    <small class="input-hint" style="display:none" data-i18n="profiles.condition_logic.hint">How multiple conditions are combined: ANY (OR) or ALL (AND)</small>
+                    <select id="profile-editor-logic">
+                        <option value="or" data-i18n="profiles.condition_logic.or">Any condition (OR)</option>
+                        <option value="and" data-i18n="profiles.condition_logic.and">All conditions (AND)</option>
+                    </select>
+                </div>
+
+                <div class="form-group">
+                    <div class="label-row">
+                        <label data-i18n="profiles.conditions">Conditions:</label>
+                        <button type="button" class="hint-toggle" onclick="toggleHint(this)" title="?">?</button>
+                    </div>
+                    <small class="input-hint" style="display:none" data-i18n="profiles.conditions.hint">Rules that determine when this profile activates</small>
+                    <div id="profile-conditions-list"></div>
+                    <button type="button" class="btn btn-secondary btn-sm" onclick="addProfileCondition()" style="margin-top: 6px;">
+                        + <span data-i18n="profiles.conditions.add">Add Condition</span>
+                    </button>
+                </div>
+
+                <div class="form-group">
+                    <div class="label-row">
+                        <label data-i18n="profiles.targets">Targets:</label>
+                        <button type="button" class="hint-toggle" onclick="toggleHint(this)" title="?">?</button>
+                    </div>
+                    <small class="input-hint" style="display:none" data-i18n="profiles.targets.hint">Targets to start when this profile activates</small>
+                    <div id="profile-targets-list" class="profile-targets-checklist"></div>
+                </div>
+
+                <div id="profile-editor-error" class="error-message" style="display: none;"></div>
+            </form>
+        </div>
+        <div class="modal-footer">
+            <button class="btn btn-icon btn-secondary" onclick="closeProfileEditorModal()" title="Cancel">&#x2715;</button>
+            <button class="btn btn-icon btn-primary" onclick="saveProfileEditor()" title="Save">&#x2713;</button>
+        </div>
+    </div>
+</div>
diff --git a/server/src/wled_controller/templates/modals/stream.html b/server/src/wled_controller/templates/modals/stream.html
new file mode 100644
index 0000000..f5d61ac
--- /dev/null
+++ b/server/src/wled_controller/templates/modals/stream.html
@@ -0,0 +1,102 @@
+<!-- Source Modal -->
+<div id="stream-modal" class="modal">
+    <div class="modal-content">
+        <div class="modal-header">
+            <h2 id="stream-modal-title" data-i18n="streams.add">Add Source</h2>
+            <button class="modal-close-btn" onclick="closeStreamModal()" title="Close">&#x2715;</button>
+        </div>
+        <div class="modal-body">
+            <input type="hidden" id="stream-id">
+            <form id="stream-form">
+                <div class="form-group">
+                    <label for="stream-name" data-i18n="streams.name">Source Name:</label>
+                    <input type="text" id="stream-name" data-i18n-placeholder="streams.name.placeholder" placeholder="My Source" required>
+                </div>
+
+                <input type="hidden" id="stream-type" value="raw">
+
+                <!-- Raw source fields -->
+                <div id="stream-raw-fields">
+                    <div class="form-group">
+                        <div class="label-row">
+                            <label data-i18n="streams.display">Display:</label>
+                            <button type="button" class="hint-toggle" onclick="toggleHint(this)" title="?">?</button>
+                        </div>
+                        <small class="input-hint" style="display:none" data-i18n="streams.display.hint">Which screen to capture</small>
+                        <input type="hidden" id="stream-display-index" value="">
+                        <button type="button" class="btn btn-display-picker" id="stream-display-picker-btn" onclick="openDisplayPicker(onStreamDisplaySelected, document.getElementById('stream-display-index').value)">
+                            <span id="stream-display-picker-label" data-i18n="displays.picker.select">Select display...</span>
+                        </button>
+                    </div>
+                    <div class="form-group">
+                        <div class="label-row">
+                            <label for="stream-capture-template" data-i18n="streams.capture_template">Capture Template:</label>
+                            <button type="button" class="hint-toggle" onclick="toggleHint(this)" title="?">?</button>
+                        </div>
+                        <small class="input-hint" style="display:none" data-i18n="streams.capture_template.hint">Engine template defining how the screen is captured</small>
+                        <select id="stream-capture-template"></select>
+                    </div>
+                    <div class="form-group">
+                        <div class="label-row">
+                            <label for="stream-target-fps" data-i18n="streams.target_fps">Target FPS:</label>
+                            <button type="button" class="hint-toggle" onclick="toggleHint(this)" title="?">?</button>
+                        </div>
+                        <small class="input-hint" style="display:none" data-i18n="streams.target_fps.hint">Target frames per second for capture (10-90)</small>
+                        <div class="slider-row">
+                            <input type="range" id="stream-target-fps" min="10" max="90" value="30" oninput="document.getElementById('stream-target-fps-value').textContent = this.value">
+                            <span id="stream-target-fps-value" class="slider-value">30</span>
+                        </div>
+                    </div>
+                </div>
+
+                <!-- Processed source fields -->
+                <div id="stream-processed-fields" style="display: none;">
+                    <div class="form-group">
+                        <div class="label-row">
+                            <label for="stream-source" data-i18n="streams.source">Source:</label>
+                            <button type="button" class="hint-toggle" onclick="toggleHint(this)" title="?">?</button>
+                        </div>
+                        <small class="input-hint" style="display:none" data-i18n="streams.source.hint">The source to apply processing filters to</small>
+                        <select id="stream-source"></select>
+                    </div>
+                    <div class="form-group">
+                        <div class="label-row">
+                            <label for="stream-pp-template" data-i18n="streams.pp_template">Processing Template:</label>
+                            <button type="button" class="hint-toggle" onclick="toggleHint(this)" title="?">?</button>
+                        </div>
+                        <small class="input-hint" style="display:none" data-i18n="streams.pp_template.hint">Filter template to apply to the source</small>
+                        <select id="stream-pp-template"></select>
+                    </div>
+                </div>
+
+                <!-- Static image fields -->
+                <div id="stream-static-image-fields" style="display: none;">
+                    <div class="form-group">
+                        <div class="label-row">
+                            <label for="stream-image-source" data-i18n="streams.image_source">Image Source:</label>
+                            <button type="button" class="hint-toggle" onclick="toggleHint(this)" title="?">?</button>
+                        </div>
+                        <small class="input-hint" style="display:none" data-i18n="streams.image_source.hint">Enter a URL (http/https) or local file path to an image</small>
+                        <input type="text" id="stream-image-source" data-i18n-placeholder="streams.image_source.placeholder" placeholder="https://example.com/image.jpg or C:\path\to\image.png">
+                    </div>
+                    <div id="stream-image-preview-container" class="image-preview-container" style="display: none;">
+                        <img id="stream-image-preview" class="stream-image-preview" src="" alt="Preview">
+                        <div id="stream-image-info" class="stream-image-info"></div>
+                    </div>
+                    <div id="stream-image-validation-status" class="validation-status" style="display: none;"></div>
+                </div>
+
+                <div class="form-group">
+                    <label for="stream-description" data-i18n="streams.description_label">Description (optional):</label>
+                    <input type="text" id="stream-description" data-i18n-placeholder="streams.description_placeholder" placeholder="Describe this source...">
+                </div>
+
+                <div id="stream-error" class="error-message" style="display: none;"></div>
+            </form>
+        </div>
+        <div class="modal-footer">
+            <button class="btn btn-icon btn-secondary" onclick="closeStreamModal()" title="Cancel">&#x2715;</button>
+            <button class="btn btn-icon btn-primary" onclick="saveStream()" title="Save">&#x2713;</button>
+        </div>
+    </div>
+</div>
diff --git a/server/src/wled_controller/templates/modals/target-editor.html b/server/src/wled_controller/templates/modals/target-editor.html
new file mode 100644
index 0000000..b7b5131
--- /dev/null
+++ b/server/src/wled_controller/templates/modals/target-editor.html
@@ -0,0 +1,92 @@
+<!-- Target Editor Modal (name, device, source, settings) -->
+<div id="target-editor-modal" class="modal">
+    <div class="modal-content">
+        <div class="modal-header">
+            <h2 id="target-editor-title" data-i18n="targets.add">🎯 Add Target</h2>
+            <button class="modal-close-btn" onclick="closeTargetEditorModal()" title="Close">&#x2715;</button>
+        </div>
+        <div class="modal-body">
+            <form id="target-editor-form">
+                <input type="hidden" id="target-editor-id">
+
+                <div class="form-group">
+                    <label for="target-editor-name" data-i18n="targets.name">Target Name:</label>
+                    <input type="text" id="target-editor-name" data-i18n-placeholder="targets.name.placeholder" placeholder="My Target" required>
+                </div>
+
+                <div class="form-group">
+                    <div class="label-row">
+                        <label for="target-editor-device" data-i18n="targets.device">Device:</label>
+                        <button type="button" class="hint-toggle" onclick="toggleHint(this)" title="?">?</button>
+                    </div>
+                    <small class="input-hint" style="display:none" data-i18n="targets.device.hint">Select the LED device to send data to</small>
+                    <select id="target-editor-device"></select>
+                </div>
+
+                <div class="form-group">
+                    <div class="label-row">
+                        <label for="target-editor-source" data-i18n="targets.source">Picture Source:</label>
+                        <button type="button" class="hint-toggle" onclick="toggleHint(this)" title="?">?</button>
+                    </div>
+                    <small class="input-hint" style="display:none" data-i18n="targets.source.hint">Select a source that defines what to capture</small>
+                    <select id="target-editor-source"></select>
+                </div>
+
+                <div class="form-group">
+                    <div class="label-row">
+                        <label for="target-editor-fps" data-i18n="targets.fps">Target FPS:</label>
+                        <button type="button" class="hint-toggle" onclick="toggleHint(this)" title="?">?</button>
+                    </div>
+                    <small class="input-hint" style="display:none" data-i18n="targets.fps.hint">Target frames per second for capture and LED updates (10-90)</small>
+                    <div class="slider-row">
+                        <input type="range" id="target-editor-fps" min="10" max="90" value="30" oninput="document.getElementById('target-editor-fps-value').textContent = this.value">
+                        <span id="target-editor-fps-value" class="slider-value">30</span>
+                    </div>
+                </div>
+
+                <div class="form-group">
+                    <div class="label-row">
+                        <label for="target-editor-interpolation" data-i18n="targets.interpolation">Interpolation Mode:</label>
+                        <button type="button" class="hint-toggle" onclick="toggleHint(this)" title="?">?</button>
+                    </div>
+                    <small class="input-hint" style="display:none" data-i18n="targets.interpolation.hint">How to calculate LED color from sampled pixels</small>
+                    <select id="target-editor-interpolation">
+                        <option value="average">Average</option>
+                        <option value="median">Median</option>
+                        <option value="dominant">Dominant</option>
+                    </select>
+                </div>
+
+                <div class="form-group">
+                    <div class="label-row">
+                        <label for="target-editor-smoothing">
+                            <span data-i18n="targets.smoothing">Smoothing:</span>
+                            <span id="target-editor-smoothing-value">0.3</span>
+                        </label>
+                        <button type="button" class="hint-toggle" onclick="toggleHint(this)" title="?">?</button>
+                    </div>
+                    <small class="input-hint" style="display:none" data-i18n="targets.smoothing.hint">Temporal blending between frames (0=none, 1=full). Reduces flicker.</small>
+                    <input type="range" id="target-editor-smoothing" min="0.0" max="1.0" step="0.05" value="0.3" oninput="document.getElementById('target-editor-smoothing-value').textContent = this.value">
+                </div>
+
+                <div class="form-group" id="target-editor-standby-group">
+                    <div class="label-row">
+                        <label for="target-editor-standby-interval">
+                            <span data-i18n="targets.standby_interval">Standby Interval:</span>
+                            <span id="target-editor-standby-interval-value">1.0</span><span>s</span>
+                        </label>
+                        <button type="button" class="hint-toggle" onclick="toggleHint(this)" title="?">?</button>
+                    </div>
+                    <small class="input-hint" style="display:none" data-i18n="targets.standby_interval.hint">How often to resend the last frame when the screen is static, to keep the device in live mode (0.5-5.0s)</small>
+                    <input type="range" id="target-editor-standby-interval" min="0.5" max="5.0" step="0.5" value="1.0" oninput="document.getElementById('target-editor-standby-interval-value').textContent = this.value">
+                </div>
+
+                <div id="target-editor-error" class="error-message" style="display: none;"></div>
+            </form>
+        </div>
+        <div class="modal-footer">
+            <button class="btn btn-icon btn-secondary" onclick="closeTargetEditorModal()" title="Cancel">&#x2715;</button>
+            <button class="btn btn-icon btn-primary" onclick="saveTargetEditor()" title="Save">&#x2713;</button>
+        </div>
+    </div>
+</div>
diff --git a/server/src/wled_controller/templates/modals/test-pp-template.html b/server/src/wled_controller/templates/modals/test-pp-template.html
new file mode 100644
index 0000000..a2a6a5d
--- /dev/null
+++ b/server/src/wled_controller/templates/modals/test-pp-template.html
@@ -0,0 +1,27 @@
+<!-- Test PP Template Modal -->
+<div id="test-pp-template-modal" class="modal">
+    <div class="modal-content">
+        <div class="modal-header">
+            <h2 data-i18n="postprocessing.test.title">Test Processing Template</h2>
+            <button class="modal-close-btn" onclick="closeTestPPTemplateModal()" title="Close">&#x2715;</button>
+        </div>
+        <div class="modal-body">
+            <div class="form-group">
+                <label data-i18n="postprocessing.test.source_stream">Source:</label>
+                <select id="test-pp-source-stream"></select>
+            </div>
+            <div class="form-group">
+                <label for="test-pp-duration">
+                    <span data-i18n="streams.test.duration">Capture Duration (s):</span>
+                    <span id="test-pp-duration-value">5</span>
+                </label>
+                <input type="range" id="test-pp-duration" min="1" max="10" step="1" value="5" oninput="updatePPTestDuration(this.value)" />
+            </div>
+
+            <button type="button" class="btn btn-primary" onclick="runPPTemplateTest()" style="margin-top: 16px;">
+                <span data-i18n="streams.test.run">🧪 Run</span>
+            </button>
+
+        </div>
+    </div>
+</div>
diff --git a/server/src/wled_controller/templates/modals/test-stream.html b/server/src/wled_controller/templates/modals/test-stream.html
new file mode 100644
index 0000000..ae89c97
--- /dev/null
+++ b/server/src/wled_controller/templates/modals/test-stream.html
@@ -0,0 +1,23 @@
+<!-- Test Source Modal -->
+<div id="test-stream-modal" class="modal">
+    <div class="modal-content">
+        <div class="modal-header">
+            <h2 data-i18n="streams.test.title">Test Source</h2>
+            <button class="modal-close-btn" onclick="closeTestStreamModal()" title="Close">&#x2715;</button>
+        </div>
+        <div class="modal-body">
+            <div class="form-group">
+                <label for="test-stream-duration">
+                    <span data-i18n="streams.test.duration">Capture Duration (s):</span>
+                    <span id="test-stream-duration-value">5</span>
+                </label>
+                <input type="range" id="test-stream-duration" min="1" max="10" step="1" value="5" oninput="updateStreamTestDuration(this.value)" />
+            </div>
+
+            <button type="button" class="btn btn-primary" onclick="runStreamTest()" style="margin-top: 16px;">
+                <span data-i18n="streams.test.run">🧪 Run</span>
+            </button>
+
+        </div>
+    </div>
+</div>
diff --git a/server/src/wled_controller/templates/modals/test-template.html b/server/src/wled_controller/templates/modals/test-template.html
new file mode 100644
index 0000000..f3a008b
--- /dev/null
+++ b/server/src/wled_controller/templates/modals/test-template.html
@@ -0,0 +1,31 @@
+<!-- Test Template Modal -->
+<div id="test-template-modal" class="modal">
+    <div class="modal-content">
+        <div class="modal-header">
+            <h2 data-i18n="templates.test.title">Test Capture Template</h2>
+            <button class="modal-close-btn" onclick="closeTestTemplateModal()" title="Close">&#x2715;</button>
+        </div>
+        <div class="modal-body">
+            <div class="form-group">
+                <label data-i18n="templates.test.display">Display:</label>
+                <input type="hidden" id="test-template-display" value="">
+                <button type="button" class="btn btn-display-picker" id="test-display-picker-btn" onclick="openDisplayPicker(onTestDisplaySelected, document.getElementById('test-template-display').value)">
+                    <span id="test-display-picker-label" data-i18n="displays.picker.select">Select display...</span>
+                </button>
+            </div>
+
+            <div class="form-group">
+                <label for="test-template-duration">
+                    <span data-i18n="templates.test.duration">Capture Duration (s):</span>
+                    <span id="test-template-duration-value">5</span>
+                </label>
+                <input type="range" id="test-template-duration" min="1" max="10" step="1" value="5" oninput="updateCaptureDuration(this.value)" />
+            </div>
+
+            <button type="button" class="btn btn-primary" onclick="runTemplateTest()" style="margin-top: 16px;">
+                <span data-i18n="templates.test.run">🧪 Run</span>
+            </button>
+
+        </div>
+    </div>
+</div>
diff --git a/server/src/wled_controller/templates/partials/display-picker.html b/server/src/wled_controller/templates/partials/display-picker.html
new file mode 100644
index 0000000..b9fb911
--- /dev/null
+++ b/server/src/wled_controller/templates/partials/display-picker.html
@@ -0,0 +1,10 @@
+<!-- Display Picker Lightbox -->
+<div id="display-picker-lightbox" class="lightbox" onclick="closeDisplayPicker(event)">
+    <button class="lightbox-close" onclick="closeDisplayPicker()" title="Close">&#x2715;</button>
+    <div class="lightbox-content display-picker-content">
+        <h3 class="display-picker-title" data-i18n="displays.picker.title">Select a Display</h3>
+        <div id="display-picker-canvas" class="display-picker-canvas">
+            <div class="loading-spinner"></div>
+        </div>
+    </div>
+</div>
diff --git a/server/src/wled_controller/templates/partials/image-lightbox.html b/server/src/wled_controller/templates/partials/image-lightbox.html
new file mode 100644
index 0000000..3c89adc
--- /dev/null
+++ b/server/src/wled_controller/templates/partials/image-lightbox.html
@@ -0,0 +1,9 @@
+<!-- Image Lightbox -->
+<div id="image-lightbox" class="lightbox" onclick="closeLightbox(event)">
+    <button class="lightbox-close" onclick="closeLightbox()" title="Close">&#x2715;</button>
+    <button id="lightbox-auto-refresh" class="lightbox-refresh-btn" onclick="toggleKCTestAutoRefresh()" title="Auto-refresh" style="display:none">&#x25B6;</button>
+    <div class="lightbox-content">
+        <img id="lightbox-image" src="" alt="Full size preview">
+        <div id="lightbox-stats" class="lightbox-stats" style="display: none;"></div>
+    </div>
+</div>
diff --git a/server/src/wled_controller/templates/partials/tutorial-overlay.html b/server/src/wled_controller/templates/partials/tutorial-overlay.html
new file mode 100644
index 0000000..b5b8047
--- /dev/null
+++ b/server/src/wled_controller/templates/partials/tutorial-overlay.html
@@ -0,0 +1,16 @@
+<!-- Device Tutorial Overlay (viewport-level) -->
+<div id="device-tutorial-overlay" class="tutorial-overlay tutorial-overlay-fixed">
+    <div class="tutorial-backdrop"></div>
+    <div class="tutorial-ring"></div>
+    <div class="tutorial-tooltip">
+        <div class="tutorial-tooltip-header">
+            <span class="tutorial-step-counter"></span>
+            <button class="tutorial-close-btn" onclick="closeTutorial()">&times;</button>
+        </div>
+        <p class="tutorial-tooltip-text"></p>
+        <div class="tutorial-tooltip-nav">
+            <button class="tutorial-prev-btn" onclick="tutorialPrev()">&#8592;</button>
+            <button class="tutorial-next-btn" onclick="tutorialNext()">&#8594;</button>
+        </div>
+    </div>
+</div>
diff --git a/server/tests/test_api.py b/server/tests/test_api.py
index 2501039..1cfbdda 100644
--- a/server/tests/test_api.py
+++ b/server/tests/test_api.py
@@ -10,13 +10,11 @@ client = TestClient(app)
 
 
 def test_root_endpoint():
-    """Test root endpoint."""
+    """Test root endpoint returns the HTML dashboard."""
     response = client.get("/")
     assert response.status_code == 200
-    data = response.json()
-    assert data["name"] == "WLED Screen Controller"
-    assert data["version"] == __version__
-    assert "/docs" in data["docs"]
+    assert "text/html" in response.headers["content-type"]
+    assert "LED Grab" in response.text
 
 
 def test_health_check():