* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    --primary-color: #4CAF50;
    --primary-hover: #5cb860;
    --primary-contrast: #ffffff;
    --danger-color: #f44336;
    --warning-color: #ff9800;
    --info-color: #2196F3;
    --font-mono: 'Cascadia Code', 'Fira Code', 'JetBrains Mono', 'SF Mono', 'Consolas', 'Liberation Mono', monospace;

    /* Spacing scale */
    --space-xs: 4px;
    --space-sm: 8px;
    --space-md: 12px;
    --space-lg: 20px;
    --space-xl: 40px;

    /* Border radius */
    --radius: 8px;
    --radius-sm: 4px;
    --radius-md: 8px;
    --radius-lg: 12px;
    --radius-pill: 100px;

    /* Animation timing */
    --duration-fast: 0.15s;
    --duration-normal: 0.25s;
    --duration-slow: 0.4s;
    --ease-out: cubic-bezier(0.16, 1, 0.3, 1);
    --ease-spring: cubic-bezier(0.34, 1.56, 0.64, 1);

    /* Font weights */
    --weight-normal: 400;
    --weight-medium: 500;
    --weight-semibold: 600;
    --weight-bold: 700;

    /* Z-index layers */
    --z-card-elevated: 10;
    --z-sticky: 100;
    --z-dropdown: 200;
    --z-bulk-toolbar: 1000;
    --z-modal: 2000;
    --z-log-overlay: 2100;
    --z-confirm: 2500;
    --z-command-palette: 3000;
    --z-toast: 3500;
    --z-overlay-spinner: 9999;
    --z-lightbox: 10000;
    --z-connection: 10000;
}

/* ── SVG icon base ── */
.icon {
    display: inline-block;
    width: 1em;
    height: 1em;
    vertical-align: -0.125em;
    fill: none;
    stroke: currentColor;
    stroke-width: 2;
    stroke-linecap: round;
    stroke-linejoin: round;
    flex-shrink: 0;
}

/* Dark theme (default) */
[data-theme="dark"] {
    --bg-color: #1a1a1a;
    --bg-secondary: #242424;
    --card-bg: #2d2d2d;
    --text-color: #e0e0e0;
    --text-primary: #e0e0e0;
    --text-secondary: #999;
    --text-muted: #777;
    --border-color: #404040;
    --display-badge-bg: rgba(0, 0, 0, 0.4);
    --primary-text-color: #66bb6a;
    --success-color: #28a745;
    --shadow-color: rgba(0, 0, 0, 0.3);
    --hover-bg: rgba(255, 255, 255, 0.05);
    --input-bg: #1a1a2e;
    color-scheme: dark;
}

/* Light theme */
[data-theme="light"] {
    --bg-color: #f5f5f5;
    --bg-secondary: #eee;
    --card-bg: #ffffff;
    --text-color: #333333;
    --text-primary: #333333;
    --text-secondary: #595959;
    --text-muted: #767676;
    --border-color: #e0e0e0;
    --display-badge-bg: rgba(255, 255, 255, 0.85);
    --primary-text-color: #3d8b40;
    --success-color: #2e7d32;
    --shadow-color: rgba(0, 0, 0, 0.12);
    --hover-bg: rgba(0, 0, 0, 0.05);
    --input-bg: #f0f0f0;
    color-scheme: light;
}

/* Default to dark theme */
body {
    background: var(--bg-color);
    color: var(--text-color);
}

html {
    background: var(--bg-color);
    overflow-x: hidden;
    overflow-y: scroll;
    scroll-behavior: smooth;
    scrollbar-gutter: stable;
}

body {
    font-family: 'DM Sans', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
    background: var(--bg-color);
    color: var(--text-color);
    line-height: 1.6;
}

html.modal-open {
    overflow: hidden; /* scrollbar-gutter: stable keeps the gutter reserved */
}

/* ── Ambient animated background ── */
#bg-anim-canvas,
#bg-effect-canvas {
    display: none;
    position: fixed;
    inset: 0;
    z-index: -1;
    width: 100%;
    height: 100%;
    pointer-events: none;
}

[data-bg-anim="on"] #bg-anim-canvas {
    display: block;
}

[data-bg-anim="on"] body {
    background: transparent;
}

/* When bg-anim is active, make entity cards slightly translucent
   so the shader bleeds through. Only target cards — NOT modals,
   pickers, tab bars, headers, or other chrome. */
[data-bg-anim="on"][data-theme="dark"] .card,
[data-bg-anim="on"][data-theme="dark"] .template-card,
[data-bg-anim="on"][data-theme="dark"] .add-device-card,
[data-bg-anim="on"][data-theme="dark"] .dashboard-target {
    background: rgba(45, 45, 45, 0.88);
}
[data-bg-anim="on"][data-theme="light"] .card,
[data-bg-anim="on"][data-theme="light"] .template-card,
[data-bg-anim="on"][data-theme="light"] .add-device-card,
[data-bg-anim="on"][data-theme="light"] .dashboard-target {
    background: rgba(255, 255, 255, 0.85);
}
/* Blur behind header via pseudo-element — applying backdrop-filter directly
   to header would create a containing block and break position:fixed on
   the .tab-bar nested inside it (mobile bottom nav). */
[data-bg-anim="on"] header {
    background: transparent;
}
[data-bg-anim="on"] header::after {
    content: '';
    position: absolute;
    inset: 0;
    z-index: -1;
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    background: color-mix(in srgb, var(--bg-color) 60%, transparent);
}

/* ── Tab indicator (background watermark) ── */
#tab-indicator {
    position: fixed;
    right: -10vw;
    top: 50%;
    transform: translateY(-50%);
    width: 55vw;
    height: 55vw;
    max-width: 600px;
    max-height: 600px;
    pointer-events: none;
    z-index: -1;
    opacity: 0;
    filter: blur(6px);
    color: var(--primary-color);
    transition: opacity 0.5s ease;
}
#tab-indicator svg {
    width: 100%;
    height: 100%;
    opacity: 0.04;
}
#tab-indicator.tab-indicator-visible {
    opacity: 1;
}
[data-theme="light"] #tab-indicator svg {
    opacity: 0.07;
}

.container {
    padding: 20px;
}

/* ── Smooth theme transitions ── */
body,
.card,
.template-card,
.modal-content,
.dashboard-target,
.perf-chart-card,
header {
    transition: background-color var(--duration-normal) ease, color var(--duration-normal) ease, border-color var(--duration-normal) ease;
}

/* ── Respect reduced motion preference ── */
@media (prefers-reduced-motion: reduce) {
    *, *::before, *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
    html { scroll-behavior: auto; }
}

@media print {
    [data-theme] {
        --bg-color: #fff;
        --card-bg: #fff;
        --text-color: #000;
        --text-secondary: #333;
        --border-color: #ccc;
    }
    .tab-bar, .app-header, .scroll-to-top, .toast-container { display: none; }
}