feat: add CSRF protection for admin API routes

Double-submit cookie pattern: login sets bh-csrf-token cookie,
proxy.ts validates X-CSRF-Token header on POST/PUT/DELETE to /api/admin/*.
New adminFetch() helper in src/lib/csrf.ts auto-includes the header.
All admin pages migrated from fetch() to adminFetch().

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

CLAUDE.md

@@ -7,8 +7,9 @@ Content language: Russian
 
 ## Tech Stack
 - **Next.js 16** (App Router, TypeScript, Turbopack)
-- **Tailwind CSS v4** (light + dark mode, class-based toggle)
+- **Tailwind CSS v4** (dark mode only, gold/black theme)
 - **lucide-react** for icons
+- **better-sqlite3** for SQLite database
 - **Fonts**: Inter (body) + Oswald (headings) via `next/font`
 - **Hosting**: Vercel (planned)
 
@@ -16,66 +17,120 @@ Content language: Russian
 - Function declarations for components (not arrow functions)
 - PascalCase for component files, camelCase for utils
 - `@/` path alias for imports
-- Semantic CSS classes via `@apply`: `surface-base`, `surface-muted`, `heading-text`, `body-text`, `nav-link`, `card`, `contact-item`, `contact-icon`, `theme-border`
-- Only Header + ThemeToggle are client components (minimal JS shipped)
 - `next/image` with `unoptimized` for PNGs that need transparency preserved
+- Header nav uses `lg:` breakpoint (1024px) for desktop/mobile switch (9 nav links + CTA need the space)
 
 ## Project Structure
 ```
 src/
 ├── app/
 │   ├── layout.tsx          # Root layout, fonts, metadata
-│   ├── page.tsx            # Landing: Hero → Team → About → Classes → Contact
+│   ├── page.tsx            # Landing: Hero → About → Team → Classes → MasterClasses → Schedule → Pricing → News → FAQ → Contact
 │   ├── globals.css         # Tailwind imports
 │   ├── styles/
 │   │   ├── theme.css       # Theme variables, semantic classes
 │   │   └── animations.css  # Keyframes, scroll reveal, modal animations
-│   ├── icon.png            # Favicon
-│   └── apple-icon.png
+│   ├── admin/
+│   │   ├── page.tsx        # Dashboard with 11 section cards
+│   │   ├── login/          # Password auth
+│   │   ├── layout.tsx      # Sidebar nav shell
+│   │   ├── _components/    # SectionEditor, FormField, ArrayEditor
+│   │   ├── meta/           # SEO editor
+│   │   ├── hero/           # Hero editor
+│   │   ├── about/          # About editor
+│   │   ├── team/           # Team list + [id] editor
+│   │   ├── classes/        # Classes editor with icon picker
+│   │   ├── master-classes/ # MC editor with registrations
+│   │   ├── schedule/       # Schedule editor
+│   │   ├── pricing/        # Pricing editor
+│   │   ├── faq/            # FAQ editor
+│   │   ├── news/           # News editor
+│   │   └── contact/        # Contact editor
+│   └── api/
+│       ├── auth/login/     # POST login
+│       ├── logout/         # POST logout
+│       ├── admin/
+│       │   ├── sections/[key]/ # GET/PUT section data
+│       │   ├── team/           # CRUD team members
+│       │   ├── team/[id]/      # GET/PUT/DELETE single member
+│       │   ├── team/reorder/   # PUT reorder
+│       │   ├── upload/         # POST file upload (whitelisted folders)
+│       │   ├── mc-registrations/ # CRUD registrations
+│       │   └── validate-instagram/ # GET check username
+│       └── master-class-register/ # POST public signup
 ├── components/
 │   ├── layout/
-│   │   ├── Header.tsx      # Sticky nav, mobile menu, theme toggle ("use client")
+│   │   ├── Header.tsx      # Sticky nav, mobile menu, booking modal ("use client")
 │   │   └── Footer.tsx
 │   ├── sections/
-│   │   ├── Hero.tsx
-│   │   ├── Team.tsx        # "use client" — clickable cards + modal
-│   │   ├── About.tsx
-│   │   ├── Classes.tsx
-│   │   └── Contact.tsx
+│   │   ├── Hero.tsx        # Hero with animated logo, floating hearts
+│   │   ├── About.tsx       # About with stats (trainers, classes, locations)
+│   │   ├── Team.tsx        # Carousel + profile view
+│   │   ├── Classes.tsx     # Showcase layout with icon selector
+│   │   ├── MasterClasses.tsx # Cards with signup modal
+│   │   ├── Schedule.tsx    # Day/group views with filters
+│   │   ├── Pricing.tsx     # Tabs: prices, rental, rules
+│   │   ├── News.tsx        # Featured + compact articles
+│   │   ├── FAQ.tsx         # Accordion with show more
+│   │   └── Contact.tsx     # Info + Yandex Maps iframe
 │   └── ui/
 │       ├── Button.tsx
 │       ├── SectionHeading.tsx
-│       ├── SocialLinks.tsx
-│       ├── ThemeToggle.tsx
-│       ├── Reveal.tsx      # Intersection Observer scroll reveal
-│       └── TeamMemberModal.tsx  # "use client" — member popup
+│       ├── BookingModal.tsx     # Booking form → Instagram DM
+│       ├── MasterClassSignupModal.tsx # MC registration form → API
+│       ├── NewsModal.tsx        # News detail popup
+│       ├── Reveal.tsx           # Intersection Observer scroll reveal
+│       ├── BackToTop.tsx
+│       └── ...
 ├── data/
-│   └── content.ts          # ALL Russian text, structured for future CMS
+│   └── content.ts          # Fallback Russian text (DB takes priority)
 ├── lib/
-│   └── constants.ts        # BRAND constants, NAV_LINKS
+│   ├── constants.ts        # BRAND constants, NAV_LINKS
+│   ├── config.ts           # UI_CONFIG (thresholds, counts)
+│   ├── db.ts               # SQLite DB, migrations, CRUD
+│   ├── auth.ts             # Token signing (Node.js)
+│   ├── auth-edge.ts        # Token verification (Edge/Web Crypto)
+│   └── content.ts          # getContent() — DB with fallback
+├── proxy.ts                # Middleware: auth guard for /admin/*
 └── types/
     ├── index.ts
-    ├── content.ts          # SiteContent, TeamMember, ClassItem, ContactInfo
+    ├── content.ts           # SiteContent, TeamMember, ClassItem, MasterClassItem, etc.
     └── navigation.ts
 ```
 
 ## Brand / Styling
-- **Accent**: rose/red (`#e11d48`)
-- **Dark mode**: bg `#0a0a0a`, surface `#171717`
-- **Light mode**: bg `#fafafa`, surface `#ffffff`
-- Logo: transparent PNG, uses `dark:invert` + `unoptimized`
+- **Accent**: gold (`#c9a96e` / `hsl(37, 42%, 61%)`)
+- **Background**: `#050505` – `#0a0a0a` (dark only)
+- **Surface**: `#171717` dark cards
+- Logo: transparent PNG heart with gold glow, uses `unoptimized`
 
 ## Content Data
-- All text lives in `src/data/content.ts` (type-safe, one file to edit)
-- 13 team members with photos, Instagram links, and personal descriptions
+- Primary source: SQLite database (`db/blackheart.db`)
+- Fallback: `src/data/content.ts` (auto-seeds DB on first access)
+- Admin panel edits go to DB, site reads from DB via `getContent()`
+- 12 team members with photos, Instagram links, bios, victories, education
 - 6 class types (Exotic Pole Dance, Pole Dance, Body Plastic, etc.)
+- Master classes with date/time slots and public registration
 - 2 addresses in Minsk, Yandex Maps embed with markers
-- Contact: phone, Instagram
+- Contact: phone, Instagram (no email)
+
+## Admin Panel
+- Password-based auth with HMAC-SHA256 signed JWT (24h TTL)
+- Cookie: `bh-admin-token` (httpOnly, secure in prod)
+- Auto-save with 800ms debounce on all section editors
+- Team members: drag-reorder, photo upload, rich bio (experience, victories, education)
+- Master classes: slots, registration viewer, trainer/style autocomplete from existing data
+- File upload: whitelisted folders (`team`, `master-classes`, `news`, `classes`), max 5MB, image types only
+
+## Security Notes
+- **CSRF protection**: Double-submit cookie pattern. Login sets `bh-csrf-token` cookie (JS-readable). All admin fetch calls use `adminFetch()` from `src/lib/csrf.ts` which sends the token as `X-CSRF-Token` header. Middleware (`proxy.ts`) validates header matches cookie on POST/PUT/DELETE to `/api/admin/*`. **Always use `adminFetch()` instead of `fetch()` for admin API calls.**
+- File upload validates: MIME type, file extension, whitelisted folder (no path traversal)
+- API routes validate: input types, string lengths, numeric IDs
+- Public MC registration: length-limited but **no rate limiting yet** (add before production)
 
 ## AST Index
 - **Always use the AST index** at `memory/ast-index.md` when searching for components, props, hooks, types, or styles
 - Contains: component tree, all exports, props, hooks, client/server status, CSS classes, keyframes
-- Covers all 31 TS/TSX files + 4 CSS files
 - Update the index when adding/removing/renaming files or exports
 
 ## Database Migrations

src/app/admin/_components/FormField.tsx

@@ -1,5 +1,6 @@
 import { useRef, useEffect, useState } from "react";
 import { Plus, X, Upload, Loader2, Link, ImageIcon, Calendar, AlertCircle, MapPin } from "lucide-react";
+import { adminFetch } from "@/lib/csrf";
 import type { RichListItem, VictoryItem } from "@/types/content";
 
 interface InputFieldProps {
@@ -379,7 +380,7 @@ export function VictoryListField({ label, items, onChange, placeholder, onLinkVa
     formData.append("file", file);
     formData.append("folder", "team");
     try {
-      const res = await fetch("/api/admin/upload", { method: "POST", body: formData });
+      const res = await adminFetch("/api/admin/upload", { method: "POST", body: formData });
       const result = await res.json();
       if (result.path) {
         onChange(items.map((item, i) => (i === index ? { ...item, image: result.path } : item)));

src/app/admin/_components/SectionEditor.tsx

@@ -2,6 +2,7 @@
 
 import { useState, useEffect, useRef, useCallback } from "react";
 import { Loader2, Check, AlertCircle } from "lucide-react";
+import { adminFetch } from "@/lib/csrf";
 
 interface SectionEditorProps<T> {
   sectionKey: string;
@@ -24,7 +25,7 @@ export function SectionEditor<T>({
   const initialLoadRef = useRef(true);
 
   useEffect(() => {
-    fetch(`/api/admin/sections/${sectionKey}`)
+    adminFetch(`/api/admin/sections/${sectionKey}`)
       .then((r) => {
         if (!r.ok) throw new Error("Failed to load");
         return r.json();
@@ -39,7 +40,7 @@ export function SectionEditor<T>({
     setError("");
 
     try {
-      const res = await fetch(`/api/admin/sections/${sectionKey}`, {
+      const res = await adminFetch(`/api/admin/sections/${sectionKey}`, {
         method: "PUT",
         headers: { "Content-Type": "application/json" },
         body: JSON.stringify(dataToSave),

src/app/admin/master-classes/page.tsx

@@ -5,6 +5,7 @@ import { SectionEditor } from "../_components/SectionEditor";
 import { InputField, TextareaField } from "../_components/FormField";
 import { ArrayEditor } from "../_components/ArrayEditor";
 import { Plus, X, Upload, Loader2, ImageIcon, AlertCircle, Check, ChevronDown, ChevronUp, Instagram, Send, Trash2, Pencil } from "lucide-react";
+import { adminFetch } from "@/lib/csrf";
 import type { MasterClassItem, MasterClassSlot } from "@/types/content";
 
 function PriceField({ label, value, onChange, placeholder }: { label: string; value: string; onChange: (v: string) => void; placeholder?: string }) {
@@ -335,7 +336,7 @@ function ImageUploadField({
     formData.append("file", file);
     formData.append("folder", "master-classes");
     try {
-      const res = await fetch("/api/admin/upload", {
+      const res = await adminFetch("/api/admin/upload", {
         method: "POST",
         body: formData,
       });
@@ -506,7 +507,7 @@ function RegistrationRow({
       instagram: `@${ig.trim()}`,
       telegram: tg.trim() ? `@${tg.trim()}` : undefined,
     };
-    const res = await fetch("/api/admin/mc-registrations", {
+    const res = await adminFetch("/api/admin/mc-registrations", {
       method: "PUT",
       headers: { "Content-Type": "application/json" },
       body: JSON.stringify(body),
@@ -647,7 +648,7 @@ function RegistrationsList({ title }: { title: string }) {
 
   useEffect(() => {
     if (!title) return;
-    fetch(`/api/admin/mc-registrations?title=${encodeURIComponent(title)}`)
+    adminFetch(`/api/admin/mc-registrations?title=${encodeURIComponent(title)}`)
       .then((r) => r.json())
       .then((data: McRegistration[]) => {
         setCount(data.length);
@@ -659,7 +660,7 @@ function RegistrationsList({ title }: { title: string }) {
   function toggle() {
     if (!open && regs.length === 0 && count !== 0) {
       setLoading(true);
-      fetch(`/api/admin/mc-registrations?title=${encodeURIComponent(title)}`)
+      adminFetch(`/api/admin/mc-registrations?title=${encodeURIComponent(title)}`)
         .then((r) => r.json())
         .then((data: McRegistration[]) => {
           setRegs(data);
@@ -680,7 +681,7 @@ function RegistrationsList({ title }: { title: string }) {
       instagram: `@${newIg.trim()}`,
       telegram: newTg.trim() ? `@${newTg.trim()}` : undefined,
     };
-    const res = await fetch("/api/admin/mc-registrations", {
+    const res = await adminFetch("/api/admin/mc-registrations", {
       method: "POST",
       headers: { "Content-Type": "application/json" },
       body: JSON.stringify(body),
@@ -705,7 +706,7 @@ function RegistrationsList({ title }: { title: string }) {
   }
 
   async function handleDelete(id: number) {
-    await fetch(`/api/admin/mc-registrations?id=${id}`, { method: "DELETE" });
+    await adminFetch(`/api/admin/mc-registrations?id=${id}`, { method: "DELETE" });
     setRegs((prev) => prev.filter((r) => r.id !== id));
     setCount((prev) => (prev !== null ? prev - 1 : null));
   }
@@ -823,7 +824,7 @@ export default function MasterClassesEditorPage() {
 
   useEffect(() => {
     // Fetch trainers from team
-    fetch("/api/admin/team")
+    adminFetch("/api/admin/team")
       .then((r) => r.json())
       .then((members: { name: string }[]) => {
         setTrainers(members.map((m) => m.name));
@@ -831,7 +832,7 @@ export default function MasterClassesEditorPage() {
       .catch(() => {});
 
     // Fetch styles from classes section
-    fetch("/api/admin/sections/classes")
+    adminFetch("/api/admin/sections/classes")
       .then((r) => r.json())
       .then((data: { items: { name: string }[] }) => {
         setStyles(data.items.map((c) => c.name));
@@ -839,7 +840,7 @@ export default function MasterClassesEditorPage() {
       .catch(() => {});
 
     // Fetch locations from schedule section
-    fetch("/api/admin/sections/schedule")
+    adminFetch("/api/admin/sections/schedule")
       .then((r) => r.json())
       .then((data: { locations: { name: string; address: string }[] }) => {
         setLocations(data.locations);

src/app/admin/news/page.tsx

@@ -5,6 +5,7 @@ import { SectionEditor } from "../_components/SectionEditor";
 import { InputField, TextareaField } from "../_components/FormField";
 import { ArrayEditor } from "../_components/ArrayEditor";
 import { Upload, Loader2, ImageIcon, X } from "lucide-react";
+import { adminFetch } from "@/lib/csrf";
 import type { NewsItem } from "@/types/content";
 
 interface NewsData {
@@ -30,7 +31,7 @@ function ImageUploadField({
     formData.append("file", file);
     formData.append("folder", "news");
     try {
-      const res = await fetch("/api/admin/upload", {
+      const res = await adminFetch("/api/admin/upload", {
         method: "POST",
         body: formData,
       });
@@ -122,12 +123,15 @@ export default function NewsEditorPage() {
                     value={item.title}
                     onChange={(v) => updateItem({ ...item, title: v })}
                   />
-                  <InputField
-                    label="Дата"
-                    value={item.date}
-                    onChange={(v) => updateItem({ ...item, date: v })}
-                    placeholder="2026-03-15"
-                  />
+                  <div>
+                    <label className="block text-sm text-neutral-400 mb-1.5">Дата</label>
+                    <input
+                      type="date"
+                      value={item.date}
+                      onChange={(e) => updateItem({ ...item, date: e.target.value })}
+                      className="w-full rounded-lg border border-white/10 bg-neutral-800 px-4 py-2.5 text-white outline-none focus:border-gold transition-colors [color-scheme:dark]"
+                    />
+                  </div>
                 </div>
                 <TextareaField
                   label="Текст"

src/app/admin/page.tsx

@@ -5,9 +5,11 @@ import {
   FileText,
   Users,
   BookOpen,
+  Star,
   Calendar,
   DollarSign,
   HelpCircle,
+  Newspaper,
   Phone,
 } from "lucide-react";
 
@@ -17,9 +19,11 @@ const CARDS = [
   { href: "/admin/about", label: "О студии", icon: FileText, desc: "Текст о студии" },
   { href: "/admin/team", label: "Команда", icon: Users, desc: "Тренеры и инструкторы" },
   { href: "/admin/classes", label: "Направления", icon: BookOpen, desc: "Типы занятий" },
+  { href: "/admin/master-classes", label: "Мастер-классы", icon: Star, desc: "Мастер-классы и записи" },
   { href: "/admin/schedule", label: "Расписание", icon: Calendar, desc: "Расписание занятий" },
   { href: "/admin/pricing", label: "Цены", icon: DollarSign, desc: "Абонементы и аренда" },
   { href: "/admin/faq", label: "FAQ", icon: HelpCircle, desc: "Часто задаваемые вопросы" },
+  { href: "/admin/news", label: "Новости", icon: Newspaper, desc: "Новости и анонсы" },
   { href: "/admin/contact", label: "Контакты", icon: Phone, desc: "Адреса, телефон, карта" },
 ];
 

src/app/admin/schedule/page.tsx

@@ -4,6 +4,7 @@ import { useState, useEffect, useRef, useCallback, useMemo } from "react";
 import { SectionEditor } from "../_components/SectionEditor";
 import { InputField, SelectField, TimeRangeField, ToggleField } from "../_components/FormField";
 import { Plus, X, Trash2 } from "lucide-react";
+import { adminFetch } from "@/lib/csrf";
 import type { ScheduleLocation, ScheduleDay, ScheduleClass } from "@/types/content";
 
 interface ScheduleData {
@@ -1113,21 +1114,21 @@ export default function ScheduleEditorPage() {
   const [classTypes, setClassTypes] = useState<string[]>([]);
 
   useEffect(() => {
-    fetch("/api/admin/team")
+    adminFetch("/api/admin/team")
       .then((r) => r.json())
       .then((members: { name: string }[]) => {
         setTrainers(members.map((m) => m.name));
       })
       .catch(() => {});
 
-    fetch("/api/admin/sections/contact")
+    adminFetch("/api/admin/sections/contact")
       .then((r) => r.json())
       .then((contact: { addresses?: string[] }) => {
         setAddresses(contact.addresses ?? []);
       })
       .catch(() => {});
 
-    fetch("/api/admin/sections/classes")
+    adminFetch("/api/admin/sections/classes")
       .then((r) => r.json())
       .then((classes: { items?: { name: string }[] }) => {
         setClassTypes((classes.items ?? []).map((c) => c.name));

src/app/admin/team/[id]/page.tsx

@@ -5,6 +5,7 @@ import { useRouter, useParams } from "next/navigation";
 import Image from "next/image";
 import { Save, Loader2, Check, ArrowLeft, Upload, AlertCircle } from "lucide-react";
 import { InputField, TextareaField, ListField, VictoryListField, VictoryItemListField } from "../../_components/FormField";
+import { adminFetch } from "@/lib/csrf";
 import type { RichListItem, VictoryItem } from "@/types/content";
 
 function extractUsername(value: string): string {
@@ -55,7 +56,7 @@ export default function TeamMemberEditorPage() {
     setIgStatus("checking");
     igTimerRef.current = setTimeout(async () => {
       try {
-        const res = await fetch(`/api/admin/validate-instagram?username=${encodeURIComponent(username)}`);
+        const res = await adminFetch(`/api/admin/validate-instagram?username=${encodeURIComponent(username)}`);
         const result = await res.json();
         setIgStatus(result.valid ? "valid" : "invalid");
       } catch {
@@ -106,7 +107,7 @@ export default function TeamMemberEditorPage() {
 
   useEffect(() => {
     if (isNew) return;
-    fetch(`/api/admin/team/${id}`)
+    adminFetch(`/api/admin/team/${id}`)
       .then((r) => r.json())
       .then((member) => {
         const username = extractUsername(member.instagram || "");
@@ -139,7 +140,7 @@ export default function TeamMemberEditorPage() {
     };
 
     if (isNew) {
-      const res = await fetch("/api/admin/team", {
+      const res = await adminFetch("/api/admin/team", {
         method: "POST",
         headers: { "Content-Type": "application/json" },
         body: JSON.stringify(payload),
@@ -148,7 +149,7 @@ export default function TeamMemberEditorPage() {
         router.push("/admin/team");
       }
     } else {
-      const res = await fetch(`/api/admin/team/${id}`, {
+      const res = await adminFetch(`/api/admin/team/${id}`, {
         method: "PUT",
         headers: { "Content-Type": "application/json" },
         body: JSON.stringify(payload),
@@ -171,7 +172,7 @@ export default function TeamMemberEditorPage() {
     formData.append("folder", "team");
 
     try {
-      const res = await fetch("/api/admin/upload", {
+      const res = await adminFetch("/api/admin/upload", {
         method: "POST",
         body: formData,
       });

src/app/admin/team/page.tsx

@@ -11,6 +11,7 @@ import {
   GripVertical,
   Check,
 } from "lucide-react";
+import { adminFetch } from "@/lib/csrf";
 import type { TeamMember } from "@/types/content";
 
 type Member = TeamMember & { id: number };
@@ -29,7 +30,7 @@ export default function TeamEditorPage() {
   const itemRefs = useRef<(HTMLDivElement | null)[]>([]);
 
   useEffect(() => {
-    fetch("/api/admin/team")
+    adminFetch("/api/admin/team")
       .then((r) => r.json())
       .then(setMembers)
       .finally(() => setLoading(false));
@@ -38,7 +39,7 @@ export default function TeamEditorPage() {
   const saveOrder = useCallback(async (updated: Member[]) => {
     setMembers(updated);
     setSaving(true);
-    await fetch("/api/admin/team/reorder", {
+    await adminFetch("/api/admin/team/reorder", {
       method: "PUT",
       headers: { "Content-Type": "application/json" },
       body: JSON.stringify({ ids: updated.map((m) => m.id) }),
@@ -159,7 +160,7 @@ export default function TeamEditorPage() {
 
   async function deleteMember(id: number) {
     if (!confirm("Удалить этого участника?")) return;
-    await fetch(`/api/admin/team/${id}`, { method: "DELETE" });
+    await adminFetch(`/api/admin/team/${id}`, { method: "DELETE" });
     setMembers((prev) => prev.filter((m) => m.id !== id));
   }
 

src/app/api/admin/team/[id]/route.ts

@@ -4,9 +4,18 @@ import { revalidatePath } from "next/cache";
 
 type Params = { params: Promise<{ id: string }> };
 
+function parseId(raw: string): number | null {
+  const n = Number(raw);
+  return Number.isInteger(n) && n > 0 ? n : null;
+}
+
 export async function GET(_request: NextRequest, { params }: Params) {
   const { id } = await params;
-  const member = getTeamMember(Number(id));
+  const numId = parseId(id);
+  if (!numId) {
+    return NextResponse.json({ error: "Invalid ID" }, { status: 400 });
+  }
+  const member = getTeamMember(numId);
   if (!member) {
     return NextResponse.json({ error: "Not found" }, { status: 404 });
   }
@@ -15,15 +24,23 @@ export async function GET(_request: NextRequest, { params }: Params) {
 
 export async function PUT(request: NextRequest, { params }: Params) {
   const { id } = await params;
+  const numId = parseId(id);
+  if (!numId) {
+    return NextResponse.json({ error: "Invalid ID" }, { status: 400 });
+  }
   const data = await request.json();
-  updateTeamMember(Number(id), data);
+  updateTeamMember(numId, data);
   revalidatePath("/");
   return NextResponse.json({ ok: true });
 }
 
 export async function DELETE(_request: NextRequest, { params }: Params) {
   const { id } = await params;
-  deleteTeamMember(Number(id));
+  const numId = parseId(id);
+  if (!numId) {
+    return NextResponse.json({ error: "Invalid ID" }, { status: 400 });
+  }
+  deleteTeamMember(numId);
   revalidatePath("/");
   return NextResponse.json({ ok: true });
 }

src/app/api/admin/team/reorder/route.ts

@@ -5,8 +5,8 @@ import { revalidatePath } from "next/cache";
 export async function PUT(request: NextRequest) {
   const { ids } = await request.json() as { ids: number[] };
 
-  if (!Array.isArray(ids) || ids.length === 0) {
-    return NextResponse.json({ error: "ids array required" }, { status: 400 });
+  if (!Array.isArray(ids) || ids.length === 0 || !ids.every((id) => Number.isInteger(id) && id > 0)) {
+    return NextResponse.json({ error: "ids must be a non-empty array of positive integers" }, { status: 400 });
   }
 
   reorderTeamMembers(ids);

src/app/api/admin/upload/route.ts

@@ -3,12 +3,15 @@ import { writeFile, mkdir } from "fs/promises";
 import path from "path";
 
 const ALLOWED_TYPES = ["image/jpeg", "image/png", "image/webp", "image/avif"];
+const ALLOWED_EXTENSIONS = [".jpg", ".jpeg", ".png", ".webp", ".avif"];
+const ALLOWED_FOLDERS = ["team", "master-classes", "news", "classes"];
 const MAX_SIZE = 5 * 1024 * 1024; // 5MB
 
 export async function POST(request: NextRequest) {
   const formData = await request.formData();
   const file = formData.get("file") as File | null;
-  const folder = (formData.get("folder") as string) || "team";
+  const rawFolder = (formData.get("folder") as string) || "team";
+  const folder = ALLOWED_FOLDERS.includes(rawFolder) ? rawFolder : "team";
 
   if (!file) {
     return NextResponse.json({ error: "No file provided" }, { status: 400 });
@@ -28,8 +31,14 @@ export async function POST(request: NextRequest) {
     );
   }
 
-  // Sanitize filename
-  const ext = path.extname(file.name) || ".webp";
+  // Validate and sanitize filename
+  const ext = path.extname(file.name).toLowerCase() || ".webp";
+  if (!ALLOWED_EXTENSIONS.includes(ext)) {
+    return NextResponse.json(
+      { error: "Invalid file extension" },
+      { status: 400 }
+    );
+  }
   const baseName = file.name
     .replace(ext, "")
     .toLowerCase()

src/app/api/auth/login/route.ts

@@ -1,5 +1,5 @@
 import { NextRequest, NextResponse } from "next/server";
-import { verifyPassword, signToken, COOKIE_NAME } from "@/lib/auth";
+import { verifyPassword, signToken, generateCsrfToken, COOKIE_NAME, CSRF_COOKIE_NAME } from "@/lib/auth";
 
 export async function POST(request: NextRequest) {
   const body = await request.json() as { password?: string };
@@ -9,6 +9,7 @@ export async function POST(request: NextRequest) {
   }
 
   const token = signToken();
+  const csrfToken = generateCsrfToken();
   const response = NextResponse.json({ ok: true });
 
   response.cookies.set(COOKIE_NAME, token, {
@@ -16,7 +17,15 @@ export async function POST(request: NextRequest) {
     secure: process.env.NODE_ENV === "production",
     sameSite: "lax",
     path: "/",
-    maxAge: 60 * 60 * 24, // 24 hours
+    maxAge: 60 * 60 * 24,
+  });
+
+  response.cookies.set(CSRF_COOKIE_NAME, csrfToken, {
+    httpOnly: false, // JS must read this to send as header
+    secure: process.env.NODE_ENV === "production",
+    sameSite: "strict",
+    path: "/",
+    maxAge: 60 * 60 * 24,
   });
 
   return response;

src/app/api/master-class-register/route.ts

@@ -6,21 +6,24 @@ export async function POST(request: Request) {
     const body = await request.json();
     const { masterClassTitle, name, instagram, telegram } = body;
 
-    if (!masterClassTitle || typeof masterClassTitle !== "string") {
+    if (!masterClassTitle || typeof masterClassTitle !== "string" || masterClassTitle.length > 200) {
       return NextResponse.json({ error: "masterClassTitle is required" }, { status: 400 });
     }
-    if (!name || typeof name !== "string" || !name.trim()) {
-      return NextResponse.json({ error: "name is required" }, { status: 400 });
+    if (!name || typeof name !== "string" || !name.trim() || name.length > 100) {
+      return NextResponse.json({ error: "name is required (max 100 chars)" }, { status: 400 });
     }
-    if (!instagram || typeof instagram !== "string" || !instagram.trim()) {
+    if (!instagram || typeof instagram !== "string" || !instagram.trim() || instagram.length > 100) {
       return NextResponse.json({ error: "Instagram аккаунт обязателен" }, { status: 400 });
     }
+    if (telegram && (typeof telegram !== "string" || telegram.length > 100)) {
+      return NextResponse.json({ error: "Telegram too long" }, { status: 400 });
+    }
 
     const id = addMcRegistration(
-      masterClassTitle.trim(),
-      name.trim(),
-      instagram.trim(),
-      telegram && typeof telegram === "string" ? telegram.trim() : undefined
+      masterClassTitle.trim().slice(0, 200),
+      name.trim().slice(0, 100),
+      instagram.trim().slice(0, 100),
+      telegram && typeof telegram === "string" ? telegram.trim().slice(0, 100) : undefined
     );
 
     return NextResponse.json({ ok: true, id });

src/components/layout/Header.tsx

@@ -100,14 +100,14 @@ export function Header() {
           </span>
         </Link>
 
-        <nav className="hidden items-center gap-8 md:flex">
+        <nav className="hidden items-center gap-3 lg:gap-5 xl:gap-6 lg:flex">
           {visibleLinks.map((link) => {
             const isActive = activeSection === link.href.replace("#", "");
             return (
               <a
                 key={link.href}
                 href={link.href}
-                className={`relative py-1 text-sm font-medium transition-all duration-300 after:absolute after:bottom-0 after:left-0 after:h-[2px] after:bg-gold after:transition-all after:duration-300 ${
+                className={`relative whitespace-nowrap py-1 text-xs lg:text-sm font-medium transition-all duration-300 after:absolute after:bottom-0 after:left-0 after:h-[2px] after:bg-gold after:transition-all after:duration-300 ${
                   isActive
                     ? "text-gold-light after:w-full"
                     : "text-neutral-400 after:w-0 hover:text-white hover:after:w-full"
@@ -125,7 +125,7 @@ export function Header() {
           </button>
         </nav>
 
-        <div className="flex items-center gap-2 md:hidden">
+        <div className="flex items-center gap-2 lg:hidden">
           <button
             onClick={() => setMenuOpen(!menuOpen)}
             aria-label="Меню"
@@ -138,7 +138,7 @@ export function Header() {
 
       {/* Mobile menu */}
       <div
-        className={`overflow-hidden transition-all duration-300 md:hidden ${
+        className={`overflow-hidden transition-all duration-300 lg:hidden ${
           menuOpen ? "max-h-80 opacity-100" : "max-h-0 opacity-0"
         }`}
       >
@@ -175,7 +175,7 @@ export function Header() {
       {/* Floating booking button — visible on scroll, mobile */}
       <button
         onClick={() => setBookingOpen(true)}
-        className={`fixed bottom-6 right-6 z-40 flex items-center gap-2 rounded-full bg-gold px-5 py-3 text-sm font-semibold text-black shadow-lg shadow-gold/25 transition-all duration-500 hover:bg-gold-light hover:shadow-xl hover:shadow-gold/30 cursor-pointer md:hidden ${
+        className={`fixed bottom-6 right-6 z-40 flex items-center gap-2 rounded-full bg-gold px-5 py-3 text-sm font-semibold text-black shadow-lg shadow-gold/25 transition-all duration-500 hover:bg-gold-light hover:shadow-xl hover:shadow-gold/30 cursor-pointer lg:hidden ${
           scrolled ? "translate-y-0 opacity-100" : "translate-y-16 opacity-0 pointer-events-none"
         }`}
       >

src/components/ui/BookingModal.tsx

@@ -3,16 +3,22 @@
 import { useState, useEffect, useCallback } from "react";
 import { createPortal } from "react-dom";
 import { X, Instagram, Send, CheckCircle, Phone } from "lucide-react";
-import { siteContent } from "@/data/content";
+import { BRAND } from "@/lib/constants";
 
 interface BookingModalProps {
   open: boolean;
   onClose: () => void;
   groupInfo?: string;
+  contact?: { instagram: string; phone: string };
 }
 
-export function BookingModal({ open, onClose, groupInfo }: BookingModalProps) {
-  const { contact } = siteContent;
+const DEFAULT_CONTACT = {
+  instagram: BRAND.instagram,
+  phone: "+375 29 389-70-01",
+};
+
+export function BookingModal({ open, onClose, groupInfo, contact: contactProp }: BookingModalProps) {
+  const contact = contactProp ?? DEFAULT_CONTACT;
   const [name, setName] = useState("");
   const [phone, setPhone] = useState("+375 ");
 
@@ -72,7 +78,7 @@ export function BookingModal({ open, onClose, groupInfo }: BookingModalProps) {
       window.open(instagramUrl, "_blank");
       setSubmitted(true);
     },
-    [name, phone]
+    [name, phone, groupInfo, contact]
   );
 
   const handleClose = useCallback(() => {

src/lib/auth.ts

@@ -63,4 +63,10 @@ function verifyTokenNode(token: string): boolean {
   }
 }
 
+export const CSRF_COOKIE_NAME = "bh-csrf-token";
+
+export function generateCsrfToken(): string {
+  return crypto.randomBytes(32).toString("base64url");
+}
+
 export { COOKIE_NAME };

src/lib/csrf.ts

@@ -0,0 +1,17 @@
+const CSRF_COOKIE_NAME = "bh-csrf-token";
+
+function getCsrfToken(): string {
+  const match = document.cookie
+    .split("; ")
+    .find((c) => c.startsWith(`${CSRF_COOKIE_NAME}=`));
+  return match ? match.split("=")[1] : "";
+}
+
+/** Wrapper around fetch that auto-includes the CSRF token header for admin API calls */
+export function adminFetch(url: string, init?: RequestInit): Promise<Response> {
+  const headers = new Headers(init?.headers);
+  if (!headers.has("x-csrf-token")) {
+    headers.set("x-csrf-token", getCsrfToken());
+  }
+  return fetch(url, { ...init, headers });
+}

src/proxy.ts

@@ -1,6 +1,10 @@
 import { NextRequest, NextResponse } from "next/server";
 import { verifyToken, COOKIE_NAME } from "@/lib/auth-edge";
 
+const CSRF_COOKIE_NAME = "bh-csrf-token";
+const CSRF_HEADER_NAME = "x-csrf-token";
+const STATE_CHANGING_METHODS = new Set(["POST", "PUT", "DELETE", "PATCH"]);
+
 export async function proxy(request: NextRequest) {
   const { pathname } = request.nextUrl;
 
@@ -20,6 +24,16 @@ export async function proxy(request: NextRequest) {
     return NextResponse.redirect(new URL("/admin/login", request.url));
   }
 
+  // CSRF check on state-changing API requests
+  if (pathname.startsWith("/api/admin/") && STATE_CHANGING_METHODS.has(request.method)) {
+    const csrfCookie = request.cookies.get(CSRF_COOKIE_NAME)?.value;
+    const csrfHeader = request.headers.get(CSRF_HEADER_NAME);
+
+    if (!csrfCookie || !csrfHeader || csrfCookie !== csrfHeader) {
+      return NextResponse.json({ error: "CSRF token mismatch" }, { status: 403 });
+    }
+  }
+
   return NextResponse.next();
 }