Add passkey login and favorite search termsHEADmaster

Single-user auth: any registered passkey logs in as the owner. First
registration needs a one-time token that the app writes to
data/registration-token when no passkey exists yet; once logged in,
more passkeys can be added without a token.

Logged in, /favorites manages a list of terms (e.g. band names).
Events whose title or artist contains a term (NFKC + case-insensitive)
get a ★, and the event list gains an "お気に入りのみ" filter.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

17 files changed, 1098 insertions, 13 deletions

diff --git a/.gitignore b/.gitignore
index 7c4fad0..0b33ad8 100644
--- a/.gitignore
+++ b/.gitignore
@@ -13,3 +13,4 @@
 
 # Generated Markdown event files (dev reference, auto-generated)
 /events/
+registration-token
diff --git a/Deploy.md b/Deploy.md
index 11921f3..91ae34e 100644
--- a/Deploy.md
+++ b/Deploy.md
@@ -66,6 +66,22 @@ git remote add hetzner golive:/var/git/tokyo-livehouse-events.git
 git push hetzner master
 ```
 
+## パスキー（ログイン）
+
+利用者は1人。どのパスキーでログインしても同じオーナー扱い。ログインするとお気に入りワード（`/favorites`）が使える。
+
+```bash
+# 初回登録: パスキー未登録なら /login へのアクセス時にトークンが自動生成される
+curl -s https://golive.yyamashita.com/login > /dev/null
+ssh root@localhost 'cat /app/tokyo-livehouse-events/data/registration-token'
+# → https://golive.yyamashita.com/login?token=<トークン> を開いて登録（トークンは1回で消える）
+
+# 全デバイスを失った場合: トークンを手で作って再登録
+ssh root@localhost 'openssl rand -base64 24 | tr "+/" "-_" > /app/tokyo-livehouse-events/data/registration-token'
+```
+
+2台目以降は、ログイン済みの状態で `/favorites` →「パスキーを追加」。
+
 ## ローカル開発
 
 ```bash
diff --git a/app/components/EventCard.tsx b/app/components/EventCard.tsx
index b23742d..ad55a57 100644
--- a/app/components/EventCard.tsx
+++ b/app/components/EventCard.tsx
@@ -30,6 +30,7 @@ export default function EventCard({ event }: Props) {
       <div className="flex-1 p-4 flex flex-col gap-2">
         {/* Title */}
         <h2 className="font-semibold text-sm leading-snug group-hover:text-indigo-300 transition-colors line-clamp-2">
+          {event.is_favorite ? <span className="text-amber-400" title="お気に入り">★ </span> : null}
           {event.title}
         </h2>
 
diff --git a/app/components/EventListRow.tsx b/app/components/EventListRow.tsx
index 30800fb..42f3e8b 100644
--- a/app/components/EventListRow.tsx
+++ b/app/components/EventListRow.tsx
@@ -31,6 +31,7 @@ export default function EventListRow({ event }: Props) {
       {/* Title + artist */}
       <span className="flex-1 min-w-0">
         <span className="block truncate font-medium text-gray-100 group-hover:text-indigo-300 transition-colors">
+          {event.is_favorite ? <span className="text-amber-400" title="お気に入り">★ </span> : null}
           {event.title}
         </span>
         {event.artist && (
diff --git a/app/components/FilterBar.tsx b/app/components/FilterBar.tsx
index 7a95d2c..f897e67 100644
--- a/app/components/FilterBar.tsx
+++ b/app/components/FilterBar.tsx
@@ -6,9 +6,11 @@ interface Props {
   areas?: string[];
   defaultDateFrom?: string;
   defaultDateTo?: string;
+  /** Show the "favorites only" toggle (logged in only) */
+  showFavorites?: boolean;
 }
 
-export default function FilterBar({ venues, areas, defaultDateFrom, defaultDateTo }: Props) {
+export default function FilterBar({ venues, areas, defaultDateFrom, defaultDateTo, showFavorites }: Props) {
   const [searchParams] = useSearchParams();
 
   return (
@@ -98,6 +100,19 @@ export default function FilterBar({ venues, areas, defaultDateFrom, defaultDateT
         </select>
       </div>
 
+      {showFavorites && (
+        <label className="flex items-center gap-1.5 py-1.5 text-sm text-gray-300 cursor-pointer">
+          <input
+            name="fav"
+            type="checkbox"
+            value="1"
+            defaultChecked={searchParams.get("fav") === "1"}
+            className="accent-amber-400"
+          />
+          <span className="text-amber-400">★</span> お気に入りのみ
+        </label>
+      )}
+
       <button
         type="submit"
         className="rounded-md bg-gray-700 px-4 py-1.5 text-sm font-medium hover:bg-gray-600 transition-colors"
@@ -118,5 +133,5 @@ export default function FilterBar({ venues, areas, defaultDateFrom, defaultDateT
 }
 
 function hasFilters(params: URLSearchParams): boolean {
-  return ["keyword", "venue_id", "date_from", "date_to", "capacity_range", "area"].some((k) => params.get(k));
+  return ["keyword", "venue_id", "date_from", "date_to", "capacity_range", "area", "fav"].some((k) => params.get(k));
 }
diff --git a/app/lib/auth.server.ts b/app/lib/auth.server.ts
new file mode 100644
index 0000000..e0e93b8
--- /dev/null
+++ b/app/lib/auth.server.ts
@@ -0,0 +1,304 @@
+/**
+ * Single-user passkey auth + favorites.
+ *
+ * - どのパスキーでログインしても同じ「オーナー」としてログインする（ユーザーは1人）
+ * - 未ログイン時のパスキー登録は、DATA_DIR/registration-token に書かれたトークンが必要
+ *   - パスキーが1つも無ければ起動後の初回アクセス時に自動生成される
+ *   - 全デバイスを失った場合は、このファイルを手で作れば再登録できる
+ * - ログイン済みなら追加のパスキー（別デバイス）をトークン無しで登録できる
+ */
+import crypto from "crypto";
+import fs from "fs";
+import path from "path";
+import {
+  generateAuthenticationOptions,
+  generateRegistrationOptions,
+  verifyAuthenticationResponse,
+  verifyRegistrationResponse,
+  type AuthenticationResponseJSON,
+  type RegistrationResponseJSON,
+} from "@simplewebauthn/server";
+import { DATA_DIR, getDb, normalizeTerm } from "./db.server";
+
+const SESSION_COOKIE = "sid";
+const CHALLENGE_COOKIE = "wa_chal";
+const SESSION_DAYS = 90;
+const CHALLENGE_MINUTES = 5;
+const RP_NAME = "ライブに行くしかない";
+const TOKEN_PATH = path.join(DATA_DIR, "registration-token");
+
+// ---------- Request helpers ----------
+
+/** Origin/RP ID as seen by the browser. Behind Caddy, the app itself receives plain http. */
+function relyingParty(request: Request): { origin: string; rpID: string } {
+  const url = new URL(request.url);
+  const host = request.headers.get("x-forwarded-host") ?? request.headers.get("host") ?? url.host;
+  const proto = request.headers.get("x-forwarded-proto") ?? url.protocol.replace(/:$/, "");
+  return { origin: `${proto}://${host}`, rpID: host.replace(/:\d+$/, "") };
+}
+
+function readCookie(request: Request, name: string): string | null {
+  const header = request.headers.get("cookie");
+  if (!header) return null;
+  for (const part of header.split(";")) {
+    const [k, ...v] = part.trim().split("=");
+    if (k === name) return decodeURIComponent(v.join("="));
+  }
+  return null;
+}
+
+function cookie(request: Request, name: string, value: string, maxAgeSec: number): string {
+  const secure = relyingParty(request).origin.startsWith("https:") ? "; Secure" : "";
+  return `${name}=${encodeURIComponent(value)}; Path=/; HttpOnly; SameSite=Lax; Max-Age=${maxAgeSec}${secure}`;
+}
+
+function sqlTimeIn(seconds: number): string {
+  return new Date(Date.now() + seconds * 1000).toISOString().replace("T", " ").slice(0, 19);
+}
+
+// ---------- Sessions ----------
+
+export function isLoggedIn(request: Request): boolean {
+  const sid = readCookie(request, SESSION_COOKIE);
+  if (!sid) return false;
+  const row = getDb()
+    .prepare("SELECT 1 FROM sessions WHERE id = ? AND expires_at > datetime('now')")
+    .get(sid);
+  return !!row;
+}
+
+export function requireLogin(request: Request): void {
+  if (!isLoggedIn(request)) {
+    const url = new URL(request.url);
+    throw new Response(null, {
+      status: 302,
+      headers: { Location: `/login?next=${encodeURIComponent(url.pathname + url.search)}` },
+    });
+  }
+}
+
+function createSession(request: Request): string {
+  const db = getDb();
+  db.prepare("DELETE FROM sessions WHERE expires_at <= datetime('now')").run();
+  const sid = crypto.randomBytes(32).toString("base64url");
+  const maxAge = SESSION_DAYS * 86400;
+  db.prepare("INSERT INTO sessions (id, expires_at) VALUES (?, ?)").run(sid, sqlTimeIn(maxAge));
+  return cookie(request, SESSION_COOKIE, sid, maxAge);
+}
+
+export function logout(request: Request): string {
+  const sid = readCookie(request, SESSION_COOKIE);
+  if (sid) getDb().prepare("DELETE FROM sessions WHERE id = ?").run(sid);
+  return cookie(request, SESSION_COOKIE, "", 0);
+}
+
+// ---------- Challenges (one-time, short-lived) ----------
+
+function storeChallenge(request: Request, challenge: string): string {
+  const db = getDb();
+  db.prepare("DELETE FROM auth_challenges WHERE expires_at <= datetime('now')").run();
+  const id = crypto.randomBytes(16).toString("base64url");
+  const maxAge = CHALLENGE_MINUTES * 60;
+  db.prepare("INSERT INTO auth_challenges (id, challenge, expires_at) VALUES (?, ?, ?)").run(
+    id, challenge, sqlTimeIn(maxAge)
+  );
+  return cookie(request, CHALLENGE_COOKIE, id, maxAge);
+}
+
+function consumeChallenge(request: Request): string | null {
+  const id = readCookie(request, CHALLENGE_COOKIE);
+  if (!id) return null;
+  const db = getDb();
+  const row = db
+    .prepare("SELECT challenge FROM auth_challenges WHERE id = ? AND expires_at > datetime('now')")
+    .get(id) as { challenge: string } | undefined;
+  db.prepare("DELETE FROM auth_challenges WHERE id = ?").run(id);
+  return row?.challenge ?? null;
+}
+
+// ---------- Registration token ----------
+
+function passkeyCount(): number {
+  return (getDb().prepare("SELECT COUNT(*) AS n FROM passkeys").get() as { n: number }).n;
+}
+
+/** Ensure a registration token exists while no passkey is registered (first-time setup). */
+export function ensureSetupToken(): void {
+  if (passkeyCount() > 0 || fs.existsSync(TOKEN_PATH)) return;
+  fs.writeFileSync(TOKEN_PATH, crypto.randomBytes(24).toString("base64url") + "\n", { mode: 0o600 });
+  console.log(`[auth] No passkey registered. Registration token written to ${TOKEN_PATH}`);
+}
+
+function checkToken(token: string | null): boolean {
+  if (!token || !fs.existsSync(TOKEN_PATH)) return false;
+  const expected = Buffer.from(fs.readFileSync(TOKEN_PATH, "utf8").trim());
+  const given = Buffer.from(token.trim());
+  return expected.length === given.length && crypto.timingSafeEqual(expected, given);
+}
+
+export function canRegister(request: Request, token: string | null): boolean {
+  return isLoggedIn(request) || checkToken(token);
+}
+
+// ---------- WebAuthn ceremonies ----------
+
+interface PasskeyRow {
+  id: string;
+  public_key: Buffer;
+  counter: number;
+  transports: string | null;
+}
+
+const OWNER_ID = new TextEncoder().encode("owner");
+
+export async function registrationOptions(request: Request) {
+  const { rpID } = relyingParty(request);
+  const existing = getDb().prepare("SELECT id, transports FROM passkeys").all() as PasskeyRow[];
+  const options = await generateRegistrationOptions({
+    rpName: RP_NAME,
+    rpID,
+    userID: OWNER_ID,
+    userName: "owner",
+    userDisplayName: "オーナー",
+    attestationType: "none",
+    excludeCredentials: existing.map((p) => ({
+      id: p.id,
+      transports: p.transports ? JSON.parse(p.transports) : undefined,
+    })),
+    authenticatorSelection: { residentKey: "required", userVerification: "preferred" },
+  });
+  return { options, setCookie: storeChallenge(request, options.challenge) };
+}
+
+export async function verifyRegistration(
+  request: Request,
+  response: RegistrationResponseJSON,
+  label: string | null,
+  usedToken: boolean
+): Promise<string> {
+  const expectedChallenge = consumeChallenge(request);
+  if (!expectedChallenge) throw new Error("challenge expired");
+  const { origin, rpID } = relyingParty(request);
+  const result = await verifyRegistrationResponse({
+    response,
+    expectedChallenge,
+    expectedOrigin: origin,
+    expectedRPID: rpID,
+    requireUserVerification: false,
+  });
+  if (!result.verified) throw new Error("registration not verified");
+
+  const { credential } = result.registrationInfo;
+  getDb()
+    .prepare("INSERT INTO passkeys (id, public_key, counter, transports, label) VALUES (?, ?, ?, ?, ?)")
+    .run(
+      credential.id,
+      Buffer.from(credential.publicKey),
+      credential.counter,
+      credential.transports ? JSON.stringify(credential.transports) : null,
+      label?.slice(0, 60) || null
+    );
+
+  // Token is single-use
+  if (usedToken) fs.rmSync(TOKEN_PATH, { force: true });
+
+  return createSession(request);
+}
+
+export async function authenticationOptions(request: Request) {
+  const { rpID } = relyingParty(request);
+  const options = await generateAuthenticationOptions({ rpID, userVerification: "preferred" });
+  return { options, setCookie: storeChallenge(request, options.challenge) };
+}
+
+export async function verifyAuthentication(
+  request: Request,
+  response: AuthenticationResponseJSON
+): Promise<string> {
+  const expectedChallenge = consumeChallenge(request);
+  if (!expectedChallenge) throw new Error("challenge expired");
+  const db = getDb();
+  const passkey = db.prepare("SELECT * FROM passkeys WHERE id = ?").get(response.id) as
+    | PasskeyRow
+    | undefined;
+  if (!passkey) throw new Error("unknown passkey");
+
+  const { origin, rpID } = relyingParty(request);
+  const result = await verifyAuthenticationResponse({
+    response,
+    expectedChallenge,
+    expectedOrigin: origin,
+    expectedRPID: rpID,
+    credential: {
+      id: passkey.id,
+      publicKey: new Uint8Array(passkey.public_key),
+      counter: passkey.counter,
+      transports: passkey.transports ? JSON.parse(passkey.transports) : undefined,
+    },
+    requireUserVerification: false,
+  });
+  if (!result.verified) throw new Error("authentication not verified");
+
+  db.prepare("UPDATE passkeys SET counter = ?, last_used_at = datetime('now') WHERE id = ?").run(
+    result.authenticationInfo.newCounter,
+    passkey.id
+  );
+  return createSession(request);
+}
+
+// ---------- Passkey management ----------
+
+export interface PasskeyInfo {
+  id: string;
+  label: string | null;
+  created_at: string;
+  last_used_at: string | null;
+}
+
+export function listPasskeys(): PasskeyInfo[] {
+  return getDb()
+    .prepare("SELECT id, label, created_at, last_used_at FROM passkeys ORDER BY created_at")
+    .all() as PasskeyInfo[];
+}
+
+/** Refuses to delete the last passkey so the owner can't lock themselves out. */
+export function deletePasskey(id: string): boolean {
+  if (passkeyCount() <= 1) return false;
+  return getDb().prepare("DELETE FROM passkeys WHERE id = ?").run(id).changes > 0;
+}
+
+// ---------- Favorites ----------
+
+export interface Favorite {
+  id: number;
+  term: string;
+  upcoming_count: number;
+}
+
+export function listFavorites(): Favorite[] {
+  return getDb()
+    .prepare(
+      `SELECT f.id, f.term,
+              (SELECT COUNT(*) FROM events e
+               WHERE e.date >= date('now', 'localtime')
+                 AND instr(nfkc_lower(e.title || ' ' || COALESCE(e.artist, '')), f.term_norm) > 0
+              ) AS upcoming_count
+       FROM favorites f ORDER BY f.term COLLATE NOCASE`
+    )
+    .all() as Favorite[];
+}
+
+export function addFavorite(term: string): boolean {
+  const trimmed = term.trim().slice(0, 100);
+  const norm = normalizeTerm(trimmed);
+  if (!norm) return false;
+  return (
+    getDb()
+      .prepare("INSERT OR IGNORE INTO favorites (term, term_norm) VALUES (?, ?)")
+      .run(trimmed, norm).changes > 0
+  );
+}
+
+export function deleteFavorite(id: number): void {
+  getDb().prepare("DELETE FROM favorites WHERE id = ?").run(id);
+}
diff --git a/app/lib/db.server.ts b/app/lib/db.server.ts
index 82a0025..9d6597d 100644
--- a/app/lib/db.server.ts
+++ b/app/lib/db.server.ts
@@ -9,11 +9,22 @@ const DB_PATH = process.env.DB_PATH
 
 let _db: Database.Database | null = null;
 
-function getDb(): Database.Database {
+/** Directory holding the DB file — also used for other runtime state files. */
+export const DATA_DIR = path.dirname(DB_PATH);
+
+/** Normalization used for favorite matching: full/half-width and case insensitive. */
+export function normalizeTerm(s: string): string {
+  return s.normalize("NFKC").toLowerCase().trim();
+}
+
+export function getDb(): Database.Database {
   if (!_db) {
     _db = new Database(DB_PATH);
     _db.pragma("journal_mode = WAL");
     _db.pragma("foreign_keys = ON");
+    _db.function("nfkc_lower", { deterministic: true }, (s: unknown) =>
+      typeof s === "string" ? normalizeTerm(s) : null
+    );
     initSchema(_db);
   }
   return _db;
@@ -63,6 +74,36 @@ function initSchema(db: Database.Database) {
 
     CREATE INDEX IF NOT EXISTS idx_scrape_logs_run_id   ON scrape_logs(run_id);
     CREATE INDEX IF NOT EXISTS idx_scrape_logs_venue_id ON scrape_logs(venue_id);
+
+    -- Single-user auth: any registered passkey logs in as "the" owner
+    CREATE TABLE IF NOT EXISTS passkeys (
+      id           TEXT PRIMARY KEY,           -- credential ID (base64url)
+      public_key   BLOB    NOT NULL,
+      counter      INTEGER NOT NULL DEFAULT 0,
+      transports   TEXT,                       -- JSON array
+      label        TEXT,
+      created_at   TEXT    NOT NULL DEFAULT (datetime('now')),
+      last_used_at TEXT
+    );
+
+    CREATE TABLE IF NOT EXISTS sessions (
+      id         TEXT PRIMARY KEY,
+      created_at TEXT NOT NULL DEFAULT (datetime('now')),
+      expires_at TEXT NOT NULL
+    );
+
+    CREATE TABLE IF NOT EXISTS auth_challenges (
+      id         TEXT PRIMARY KEY,
+      challenge  TEXT NOT NULL,
+      expires_at TEXT NOT NULL
+    );
+
+    CREATE TABLE IF NOT EXISTS favorites (
+      id         INTEGER PRIMARY KEY AUTOINCREMENT,
+      term       TEXT NOT NULL,
+      term_norm  TEXT NOT NULL UNIQUE,
+      created_at TEXT NOT NULL DEFAULT (datetime('now'))
+    );
   `);
 
   // Migration: add capacity column to existing venues tables
@@ -99,6 +140,8 @@ export interface Event {
   description: string | null;
   source_url: string | null;
   fetched_at: string;
+  /** 1 if title/artist matches a favorite term. Only computed when with_favorites is set. */
+  is_favorite?: number;
 }
 
 export interface EventInput {
@@ -173,13 +216,24 @@ export interface QueryEventsParams {
   keyword?: string;
   capacity_range?: CapacityRange;
   area?: string;
+  /** Compute is_favorite for each row */
+  with_favorites?: boolean;
+  /** Only events matching a favorite term */
+  favorites_only?: boolean;
   limit?: number;
   offset?: number;
 }
 
+const FAVORITE_MATCH_SQL = `EXISTS (
+  SELECT 1 FROM favorites f
+  WHERE instr(nfkc_lower(e.title || ' ' || COALESCE(e.artist, '')), f.term_norm) > 0
+)`;
+
 export function queryEvents(params: QueryEventsParams = {}): Event[] {
-  const { date_from, date_to, venue_id, keyword, capacity_range, area, limit = 60, offset = 0 } =
-    params;
+  const {
+    date_from, date_to, venue_id, keyword, capacity_range, area,
+    with_favorites, favorites_only, limit = 60, offset = 0,
+  } = params;
 
   const clauses: string[] = [];
   const args: unknown[] = [];
@@ -211,12 +265,16 @@ export function queryEvents(params: QueryEventsParams = {}): Event[] {
     clauses.push("v.area = ?");
     args.push(area);
   }
+  if (favorites_only) {
+    clauses.push(FAVORITE_MATCH_SQL);
+  }
 
   const where = clauses.length ? `WHERE ${clauses.join(" AND ")}` : "";
 
   return getDb()
     .prepare(
       `SELECT e.*, v.name AS venue_name, v.area AS venue_area
+              ${with_favorites ? `, ${FAVORITE_MATCH_SQL} AS is_favorite` : ""}
        FROM events e JOIN venues v ON e.venue_id = v.id
        ${where}
        ORDER BY e.date ASC, e.start_time ASC
diff --git a/app/routes.ts b/app/routes.ts
index 21a950d..d45106c 100644
--- a/app/routes.ts
+++ b/app/routes.ts
@@ -8,6 +8,8 @@ export default [
     route(":id", "routes/events.$id.tsx"),
   ]),
   route("venues", "routes/venues.tsx"),
+  route("favorites", "routes/favorites.tsx"),
+  route("login", "routes/login.tsx"),
   ...prefix("api", [
     route("scrape", "routes/api.scrape.ts"),
     route("scrape-status", "routes/api.scrape-status.ts"),
@@ -17,5 +19,6 @@ export default [
     route("venues", "routes/api.venues.ts"),
     route("openapi.json", "routes/api.openapi.ts"),
     route("image", "routes/api.image.ts"),
+    route("auth/:step", "routes/api.auth.$step.ts"),
   ]),
 ] satisfies RouteConfig;
diff --git a/app/routes/api.auth.$step.ts b/app/routes/api.auth.$step.ts
new file mode 100644
index 0000000..64940f2
--- /dev/null
+++ b/app/routes/api.auth.$step.ts
@@ -0,0 +1,63 @@
+/**
+ * Resource route: POST /api/auth/:step
+ *
+ * register-options / register-verify — パスキー登録（ログイン済み or 登録トークン必須）
+ * login-options / login-verify       — パスキーでログイン
+ * logout                             — セッション破棄して /events へ
+ */
+import { redirect } from "react-router";
+import type { Route } from "./+types/api.auth.$step";
+import {
+  authenticationOptions,
+  canRegister,
+  isLoggedIn,
+  logout,
+  registrationOptions,
+  verifyAuthentication,
+  verifyRegistration,
+} from "~/lib/auth.server";
+
+export async function action({ request, params }: Route.ActionArgs) {
+  switch (params.step) {
+    case "register-options": {
+      const { token } = await request.json();
+      if (!canRegister(request, token ?? null)) return forbidden();
+      const { options, setCookie } = await registrationOptions(request);
+      return Response.json(options, { headers: { "Set-Cookie": setCookie } });
+    }
+    case "register-verify": {
+      const { token, response, label } = await request.json();
+      const loggedIn = isLoggedIn(request);
+      if (!canRegister(request, token ?? null)) return forbidden();
+      return withSession(() =>
+        verifyRegistration(request, response, label ?? null, !loggedIn)
+      );
+    }
+    case "login-options": {
+      const { options, setCookie } = await authenticationOptions(request);
+      return Response.json(options, { headers: { "Set-Cookie": setCookie } });
+    }
+    case "login-verify": {
+      const { response } = await request.json();
+      return withSession(() => verifyAuthentication(request, response));
+    }
+    case "logout":
+      return redirect("/events", { headers: { "Set-Cookie": logout(request) } });
+    default:
+      throw new Response("Not Found", { status: 404 });
+  }
+}
+
+async function withSession(verify: () => Promise<string>): Promise<Response> {
+  try {
+    const setCookie = await verify();
+    return Response.json({ ok: true }, { headers: { "Set-Cookie": setCookie } });
+  } catch (e) {
+    console.warn("[auth]", e);
+    return Response.json({ ok: false, error: (e as Error).message }, { status: 400 });
+  }
+}
+
+function forbidden(): Response {
+  return Response.json({ ok: false, error: "登録トークンが無効です" }, { status: 403 });
+}
diff --git a/app/routes/events.$id.tsx b/app/routes/events.$id.tsx
index 87836ed..6837430 100644
--- a/app/routes/events.$id.tsx
+++ b/app/routes/events.$id.tsx
@@ -73,6 +73,7 @@ export default function EventDetail() {
           <Link to="/events" className="hover:text-white transition-colors">イベント</Link>
           <Link to="/events/by-date" className="hover:text-white transition-colors">日付別</Link>
           <Link to="/venues" className="hover:text-white transition-colors">会場一覧</Link>
+          <Link to="/favorites" className="hover:text-white transition-colors">★ お気に入り</Link>
         </nav>
       </header>
 
diff --git a/app/routes/events._index.tsx b/app/routes/events._index.tsx
index 33568df..563b0c0 100644
--- a/app/routes/events._index.tsx
+++ b/app/routes/events._index.tsx
@@ -6,6 +6,7 @@ import EventListRow from "~/components/EventListRow";
 import FilterBar from "~/components/FilterBar";
 import ScrapeButton from "~/components/ScrapeButton";
 import { useVenueFilter } from "~/lib/venue-filter";
+import { isLoggedIn } from "~/lib/auth.server";
 
 function defaultWindow() {
   const today = new Date();
@@ -27,19 +28,24 @@ export async function loader({ request }: Route.LoaderArgs) {
   const keyword = url.searchParams.get("keyword") ?? undefined;
   const capacity_range = (url.searchParams.get("capacity_range") ?? undefined) as CapacityRange | undefined;
   const area = url.searchParams.get("area") ?? undefined;
+  const loggedIn = isLoggedIn(request);
+  const favorites_only = loggedIn && url.searchParams.get("fav") === "1";
   const page = Math.max(1, parseInt(url.searchParams.get("page") ?? "1", 10));
   const limit = 30;
   const offset = (page - 1) * limit;
 
-  const events = queryEvents({ date_from, date_to, venue_id, keyword, capacity_range, area, limit, offset });
+  const events = queryEvents({
+    date_from, date_to, venue_id, keyword, capacity_range, area,
+    with_favorites: loggedIn, favorites_only, limit, offset,
+  });
   const venues = getVenues();
   const areas = [...new Set(venues.filter((v) => v.area).map((v) => v.area as string))].sort();
 
-  return { events, venues, areas, page, hasMore: events.length === limit, date_from, date_to };
+  return { events, venues, areas, page, hasMore: events.length === limit, date_from, date_to, loggedIn };
 }
 
 export default function EventsIndex() {
-  const { events, venues, areas, page, hasMore, date_from, date_to } = useLoaderData<typeof loader>();
+  const { events, venues, areas, page, hasMore, date_from, date_to, loggedIn } = useLoaderData<typeof loader>();
   const [searchParams, setSearchParams] = useSearchParams();
   const view = (searchParams.get("view") ?? "card") as "card" | "list";
   const { hiddenIds } = useVenueFilter();
@@ -67,6 +73,7 @@ export default function EventsIndex() {
           <Link to="/events" className="hover:text-white transition-colors">イベント</Link>
           <Link to="/events/by-date" className="hover:text-white transition-colors">日付別</Link>
           <Link to="/venues" className="hover:text-white transition-colors">会場一覧</Link>
+          <Link to="/favorites" className="hover:text-white transition-colors">★ お気に入り</Link>
         </nav>
       </header>
 
@@ -94,7 +101,7 @@ export default function EventsIndex() {
           </div>
         </div>
 
-        <FilterBar venues={venues} areas={areas} defaultDateFrom={date_from} defaultDateTo={date_to} />
+        <FilterBar venues={venues} areas={areas} defaultDateFrom={date_from} defaultDateTo={date_to} showFavorites={loggedIn} />
 
         {hiddenEventCount > 0 && (
           <p className="mt-3 text-xs text-gray-500">
diff --git a/app/routes/events.by-date.tsx b/app/routes/events.by-date.tsx
index ee4a873..5c7876f 100644
--- a/app/routes/events.by-date.tsx
+++ b/app/routes/events.by-date.tsx
@@ -2,6 +2,7 @@ import { useLoaderData, useSearchParams, Link, Form } from "react-router";
 import { queryEvents, getVenues, type CapacityRange } from "~/lib/db.server";
 import type { Event } from "~/lib/db.server";
 import { useVenueFilter } from "~/lib/venue-filter";
+import { isLoggedIn } from "~/lib/auth.server";
 
 function todayJst(): string {
   // JST = UTC+9
@@ -38,7 +39,10 @@ export async function loader({ request }: { request: Request }) {
   const capacity_range = (url.searchParams.get("capacity_range") ?? undefined) as CapacityRange | undefined;
   const area = url.searchParams.get("area") ?? undefined;
 
-  const events = queryEvents({ date_from: date, date_to: date, keyword, venue_id, capacity_range, area, limit: 500 });
+  const events = queryEvents({
+    date_from: date, date_to: date, keyword, venue_id, capacity_range, area,
+    with_favorites: isLoggedIn(request), limit: 500,
+  });
   const venues = getVenues();
   const areas = [...new Set(venues.filter((v) => v.area).map((v) => v.area as string))].sort();
 
@@ -89,6 +93,7 @@ export default function EventsByDate() {
           <Link to="/events" className="hover:text-white transition-colors">イベント</Link>
           <Link to="/events/by-date" className="text-white">日付別</Link>
           <Link to="/venues" className="hover:text-white transition-colors">会場一覧</Link>
+          <Link to="/favorites" className="hover:text-white transition-colors">★ お気に入り</Link>
         </nav>
       </header>
 
@@ -265,6 +270,7 @@ function VenueEventRow({ event }: { event: Event }) {
       {/* Title + artist */}
       <span className="flex-1 min-w-0">
         <span className="block truncate text-sm font-medium text-gray-100 group-hover:text-indigo-300 transition-colors">
+          {event.is_favorite ? <span className="text-amber-400" title="お気に入り">★ </span> : null}
           {event.title}
         </span>
         {event.artist && (
diff --git a/app/routes/favorites.tsx b/app/routes/favorites.tsx
new file mode 100644
index 0000000..e2f620d
--- /dev/null
+++ b/app/routes/favorites.tsx
@@ -0,0 +1,161 @@
+import { Form, Link, useLoaderData, useNavigation } from "react-router";
+import type { Route } from "./+types/favorites";
+import {
+  addFavorite,
+  deleteFavorite,
+  deletePasskey,
+  listFavorites,
+  listPasskeys,
+  requireLogin,
+} from "~/lib/auth.server";
+
+export async function loader({ request }: Route.LoaderArgs) {
+  requireLogin(request);
+  return { favorites: listFavorites(), passkeys: listPasskeys() };
+}
+
+export async function action({ request }: Route.ActionArgs) {
+  requireLogin(request);
+  const form = await request.formData();
+  switch (form.get("intent")) {
+    case "add": {
+      const added = addFavorite(String(form.get("term") ?? ""));
+      return { error: added ? null : "空欄か、登録済みのワードです" };
+    }
+    case "delete":
+      deleteFavorite(Number(form.get("id")));
+      return { error: null };
+    case "delete-passkey":
+      return {
+        error: deletePasskey(String(form.get("id"))) ? null : "最後のパスキーは削除できません",
+      };
+  }
+  return { error: null };
+}
+
+export default function Favorites({ actionData }: Route.ComponentProps) {
+  const { favorites, passkeys } = useLoaderData<typeof loader>();
+  const navigation = useNavigation();
+  const adding = navigation.formData?.get("intent") === "add";
+
+  return (
+    <div className="min-h-screen bg-gray-950 text-gray-100">
+      <header className="border-b border-gray-800 px-4 sm:px-6 py-3 sm:py-4 flex flex-col sm:flex-row sm:items-center sm:justify-between gap-2 sm:gap-0">
+        <Link to="/" className="text-xl font-bold tracking-tight text-white">
+          🎸 ライブに行くしかない
+        </Link>
+        <nav className="flex gap-4 sm:gap-6 text-sm text-gray-400">
+          <Link to="/events" className="hover:text-white transition-colors">イベント</Link>
+          <Link to="/events/by-date" className="hover:text-white transition-colors">日付別</Link>
+          <Link to="/venues" className="hover:text-white transition-colors">会場一覧</Link>
+          <Link to="/favorites" className="text-white font-medium">★ お気に入り</Link>
+        </nav>
+      </header>
+
+      <main className="max-w-2xl mx-auto px-4 py-8 flex flex-col gap-10">
+        <section>
+          <div className="mb-4 flex items-center justify-between">
+            <h1 className="text-2xl font-bold">お気に入り</h1>
+            <Link
+              to="/events?fav=1"
+              className="rounded-md bg-indigo-600 px-3 py-1.5 text-sm font-medium hover:bg-indigo-500 transition-colors"
+            >
+              該当イベントを見る →
+            </Link>
+          </div>
+          <p className="mb-4 text-xs text-gray-400">
+            バンド名などを登録すると、タイトルか出演者に含まれるイベントに ★ が付きます（全角/半角・大文字/小文字は区別しません）。
+          </p>
+
+          <Form method="post" className="flex gap-2" key={favorites.length}>
+            <input type="hidden" name="intent" value="add" />
+            <input
+              name="term"
+              required
+              maxLength={100}
+              placeholder="バンド名、イベント名..."
+              className="flex-1 rounded-md bg-gray-800 border border-gray-700 px-3 py-1.5 text-sm focus:outline-none focus:ring-1 focus:ring-indigo-500"
+            />
+            <button
+              type="submit"
+              disabled={adding}
+              className="rounded-md bg-gray-700 px-4 py-1.5 text-sm font-medium hover:bg-gray-600 disabled:opacity-50 transition-colors"
+            >
+              追加
+            </button>
+          </Form>
+          {actionData?.error && <p className="mt-2 text-sm text-red-400">{actionData.error}</p>}
+
+          {favorites.length === 0 ? (
+            <p className="mt-6 text-sm text-gray-500">まだ登録されていません</p>
+          ) : (
+            <ul className="mt-4 flex flex-col gap-1.5">
+              {favorites.map((f) => (
+                <li
+                  key={f.id}
+                  className="flex items-center gap-3 rounded-lg px-4 py-2.5 bg-gray-800/40 border border-gray-700/30 text-sm"
+                >
+                  <Link
+                    to={`/events?keyword=${encodeURIComponent(f.term)}`}
+                    className="flex-1 min-w-0 truncate hover:text-indigo-300 transition-colors"
+                  >
+                    {f.term}
+                  </Link>
+                  <span className={`text-xs tabular-nums ${f.upcoming_count > 0 ? "text-indigo-300" : "text-gray-600"}`}>
+                    {f.upcoming_count} 件
+                  </span>
+                  <Form method="post">
+                    <input type="hidden" name="intent" value="delete" />
+                    <input type="hidden" name="id" value={f.id} />
+                    <button type="submit" className="text-gray-500 hover:text-red-400 transition-colors" title="削除">
+                      ✕
+                    </button>
+                  </Form>
+                </li>
+              ))}
+            </ul>
+          )}
+        </section>
+
+        <section className="border-t border-gray-800 pt-8">
+          <h2 className="mb-3 text-lg font-semibold">パスキー</h2>
+          <ul className="flex flex-col gap-1.5">
+            {passkeys.map((p) => (
+              <li key={p.id} className="flex items-center gap-3 rounded-lg px-4 py-2.5 bg-gray-800/40 border border-gray-700/30 text-sm">
+                <span className="flex-1 min-w-0 truncate">{p.label ?? "（名前なし）"}</span>
+                <span className="text-xs text-gray-500">
+                  {p.last_used_at ? `最終使用 ${p.last_used_at.slice(0, 10)}` : `登録 ${p.created_at.slice(0, 10)}`}
+                </span>
+                {passkeys.length > 1 && (
+                  <Form method="post">
+                    <input type="hidden" name="intent" value="delete-passkey" />
+                    <input type="hidden" name="id" value={p.id} />
+                    <button type="submit" className="text-gray-500 hover:text-red-400 transition-colors" title="削除">
+                      ✕
+                    </button>
+                  </Form>
+                )}
+              </li>
+            ))}
+          </ul>
+          <div className="mt-4 flex gap-3">
+            <Link
+              to="/login"
+              className="rounded-md border border-gray-700 px-4 py-1.5 text-sm text-gray-300 hover:text-white transition-colors"
+            >
+              パスキーを追加
+            </Link>
+            <Form method="post" action="/api/auth/logout">
+              <button
+                type="submit"
+                className="rounded-md border border-gray-700 px-4 py-1.5 text-sm text-gray-400 hover:text-white transition-colors"
+              >
+                ログアウト
+              </button>
+            </Form>
+          </div>
+        </section>
+      </main>
+    </div>
+  );
+}
diff --git a/app/routes/login.tsx b/app/routes/login.tsx
new file mode 100644
index 0000000..69353ea
--- /dev/null
+++ b/app/routes/login.tsx
@@ -0,0 +1,117 @@
+import { useState } from "react";
+import { Link, useLoaderData, useNavigate } from "react-router";
+import { startAuthentication, startRegistration } from "@simplewebauthn/browser";
+import type { Route } from "./+types/login";
+import { ensureSetupToken, isLoggedIn } from "~/lib/auth.server";
+
+export async function loader({ request }: Route.LoaderArgs) {
+  ensureSetupToken();
+  const url = new URL(request.url);
+  const next = url.searchParams.get("next");
+  return {
+    loggedIn: isLoggedIn(request),
+    token: url.searchParams.get("token"),
+    // Only allow same-site relative redirects
+    next: next && /^\/(?![/\\])/.test(next) ? next : "/favorites",
+  };
+}
+
+async function postJson(path: string, body: unknown) {
+  const res = await fetch(path, {
+    method: "POST",
+    headers: { "Content-Type": "application/json" },
+    body: JSON.stringify(body),
+  });
+  const data = await res.json();
+  if (!res.ok || data.ok === false) throw new Error(data.error ?? `HTTP ${res.status}`);
+  return data;
+}
+
+export default function Login() {
+  const { loggedIn, token, next } = useLoaderData<typeof loader>();
+  const navigate = useNavigate();
+  const [busy, setBusy] = useState(false);
+  const [error, setError] = useState<string | null>(null);
+  const [label, setLabel] = useState("");
+  const canRegister = loggedIn || !!token;
+
+  async function run(fn: () => Promise<void>) {
+    setBusy(true);
+    setError(null);
+    try {
+      await fn();
+      navigate(next);
+    } catch (e) {
+      const err = e as Error;
+      setError(err.name === "NotAllowedError" ? "キャンセルされました" : err.message);
+    } finally {
+      setBusy(false);
+    }
+  }
+
+  const login = () =>
+    run(async () => {
+      const optionsJSON = await postJson("/api/auth/login-options", {});
+      const response = await startAuthentication({ optionsJSON });
+      await postJson("/api/auth/login-verify", { response });
+    });
+
+  const register = () =>
+    run(async () => {
+      const optionsJSON = await postJson("/api/auth/register-options", { token });
+      const response = await startRegistration({ optionsJSON });
+      await postJson("/api/auth/register-verify", { token, response, label: label || null });
+    });
+
+  return (
+    <div className="min-h-screen bg-gray-950 text-gray-100 flex items-center justify-center px-4">
+      <div className="w-full max-w-sm rounded-xl border border-gray-800 bg-gray-900 p-6 flex flex-col gap-5">
+        <Link to="/events" className="text-lg font-bold tracking-tight text-white">
+          🎸 ライブに行くしかない
+        </Link>
+
+        {!loggedIn && (
+          <button
+            onClick={login}
+            disabled={busy}
+            className="rounded-md bg-indigo-600 px-4 py-2.5 text-sm font-medium hover:bg-indigo-500 disabled:opacity-50 transition-colors"
+          >
+            🔑 パスキーでログイン
+          </button>
+        )}
+
+        {loggedIn && !token && (
+          <p className="text-sm text-gray-300">
+            ログイン済みです。{" "}
+            <Link to="/favorites" className="text-indigo-400 hover:text-indigo-300 underline">
+              お気に入りへ
+            </Link>
+          </p>
+        )}
+
+        {canRegister && (
+          <div className="flex flex-col gap-2 border-t border-gray-800 pt-5">
+            <p className="text-xs text-gray-400">
+              {loggedIn ? "このデバイスのパスキーを追加登録" : "パスキーを新規登録"}
+            </p>
+            <input
+              value={label}
+              onChange={(e) => setLabel(e.target.value)}
+              placeholder="デバイス名（例: iPhone）"
+              className="rounded-md bg-gray-800 border border-gray-700 px-3 py-1.5 text-sm focus:outline-none focus:ring-1 focus:ring-indigo-500"
+            />
+            <button
+              onClick={register}
+              disabled={busy}
+              className="rounded-md bg-gray-700 px-4 py-2 text-sm font-medium hover:bg-gray-600 disabled:opacity-50 transition-colors"
+            >
+              パスキーを登録
+            </button>
+          </div>
+        )}
+
+        {error && <p className="text-sm text-red-400">{error}</p>}
+      </div>
+    </div>
+  );
+}
diff --git a/app/routes/venues.tsx b/app/routes/venues.tsx
index 9b8093a..690b1c2 100644
--- a/app/routes/venues.tsx
+++ b/app/routes/venues.tsx
@@ -26,6 +26,7 @@ export default function Venues() {
           <Link to="/events" className="hover:text-white transition-colors">イベント</Link>
           <Link to="/events/by-date" className="hover:text-white transition-colors">日付別</Link>
           <Link to="/venues" className="text-white font-medium">会場一覧</Link>
+          <Link to="/favorites" className="hover:text-white transition-colors">★ お気に入り</Link>
         </nav>
       </header>
 
diff --git a/package-lock.json b/package-lock.json
index 2ae510b..4ddb459 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -8,6 +8,8 @@
       "dependencies": {
         "@react-router/node": "^7.3.0",
         "@react-router/serve": "^7.3.0",
+        "@simplewebauthn/browser": "^14.0.0",
+        "@simplewebauthn/server": "^14.0.2",
         "better-sqlite3": "^12.9.0",
         "cheerio": "^1.2.0",
         "isbot": "^5.1.36",
@@ -924,6 +926,12 @@
         "node": ">=18"
       }
     },
+    "node_modules/@hexagon/base64": {
+      "version": "1.1.28",
+      "resolved": "https://registry.npmjs.org/@hexagon/base64/-/base64-1.1.28.tgz",
+      "integrity": "sha512-lhqDEAvWixy3bZ+UOYbPwUbBkwBq5C1LAJ/xPC8Oi+lL54oyakv/npbA0aU2hgCsx/1NUd4IBvV03+aUBWxerw==",
+      "license": "MIT"
+    },
     "node_modules/@isaacs/cliui": {
       "version": "8.0.2",
       "resolved": "https://registry.npmjs.org/@isaacs/cliui/-/cliui-8.0.2.tgz",
@@ -986,6 +994,12 @@
         "@jridgewell/sourcemap-codec": "^1.4.14"
       }
     },
+    "node_modules/@levischuck/tiny-cbor": {
+      "version": "0.2.11",
+      "resolved": "https://registry.npmjs.org/@levischuck/tiny-cbor/-/tiny-cbor-0.2.11.tgz",
+      "integrity": "sha512-llBRm4dT4Z89aRsm6u2oEZ8tfwL/2l6BwpZ7JcyieouniDECM5AqNgr/y08zalEIvW3RSK4upYyybDcmjXqAow==",
+      "license": "MIT"
+    },
     "node_modules/@mjackson/node-fetch-server": {
       "version": "0.2.0",
       "resolved": "https://registry.npmjs.org/@mjackson/node-fetch-server/-/node-fetch-server-0.2.0.tgz",
@@ -1067,6 +1081,239 @@
         "node": "^14.17.0 || ^16.13.0 || >=18.0.0"
       }
     },
+    "node_modules/@peculiar/asn1-android": {
+      "version": "2.9.5",
+      "resolved": "https://registry.npmjs.org/@peculiar/asn1-android/-/asn1-android-2.9.5.tgz",
+      "integrity": "sha512-KnNE4l033gbJ3ZzfYk7fJpSZwhd5xT+dPAnrB8bcwqylHiLN2zjZ0OyFao0LDIOI/ZdXRabV0n3Ww/KvpgZq6w==",
+      "license": "MIT",
+      "dependencies": {
+        "@peculiar/asn1-schema": "^2.9.5",
+        "asn1js": "^3.0.10",
+        "tslib": "^2.8.1"
+      },
+      "engines": {
+        "node": ">=14"
+      }
+    },
+    "node_modules/@peculiar/asn1-asym-key": {
+      "version": "2.9.5",
+      "resolved": "https://registry.npmjs.org/@peculiar/asn1-asym-key/-/asn1-asym-key-2.9.5.tgz",
+      "integrity": "sha512-U3Q2bUWYNVpfk+oOhPl/+OSHxXaBTQBwMf93jJ7oPi/sbmcY5CnARdjGMwLoXT/ggWSryo5t7A7o3/Gfz0U2WA==",
+      "license": "MIT",
+      "dependencies": {
+        "@peculiar/asn1-pkcs8": "^2.9.5",
+        "@peculiar/asn1-schema": "^2.9.5",
+        "@peculiar/asn1-x509": "^2.9.5",
+        "asn1js": "^3.0.10",
+        "tslib": "^2.8.1"
+      },
+      "engines": {
+        "node": ">=14"
+      }
+    },
+    "node_modules/@peculiar/asn1-cms": {
+      "version": "2.9.5",
+      "resolved": "https://registry.npmjs.org/@peculiar/asn1-cms/-/asn1-cms-2.9.5.tgz",
+      "integrity": "sha512-4Ivz0fsyFofe0bslNsYcGN9+iETdHX4v+BFwIPr+K/BAt61sHXECP63ff9FntU9zcfVQELJFdUG9so44OjUlBQ==",
+      "license": "MIT",
+      "dependencies": {
+        "@peculiar/asn1-schema": "^2.9.5",
+        "@peculiar/asn1-x509": "^2.9.5",
+        "@peculiar/asn1-x509-attr": "^2.9.5",
+        "asn1js": "^3.0.10",
+        "tslib": "^2.8.1"
+      },
+      "engines": {
+        "node": ">=14"
+      }
+    },
+    "node_modules/@peculiar/asn1-csr": {
+      "version": "2.9.5",
+      "resolved": "https://registry.npmjs.org/@peculiar/asn1-csr/-/asn1-csr-2.9.5.tgz",
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+      },
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+        "tslib": "^2.8.1"
+      },
+      "engines": {
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+      }
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+    "node_modules/@peculiar/asn1-x509-attr": {
+      "version": "2.9.5",
+      "resolved": "https://registry.npmjs.org/@peculiar/asn1-x509-attr/-/asn1-x509-attr-2.9.5.tgz",
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+      "dependencies": {
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+        "@peculiar/asn1-x509": "^2.9.5",
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+        "tslib": "^2.8.1"
+      },
+      "engines": {
+        "node": ">=14"
+      }
+    },
+    "node_modules/@peculiar/asn1-x509-post-quantum": {
+      "version": "2.9.5",
+      "resolved": "https://registry.npmjs.org/@peculiar/asn1-x509-post-quantum/-/asn1-x509-post-quantum-2.9.5.tgz",
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+      "license": "MIT",
+      "dependencies": {
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+        "@peculiar/asn1-schema": "^2.9.5",
+        "@peculiar/asn1-x509": "^2.9.5",
+        "asn1js": "^3.0.10",
+        "tslib": "^2.8.1"
+      },
+      "engines": {
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+    },
+    "node_modules/@peculiar/utils": {
+      "version": "2.0.3",
+      "resolved": "https://registry.npmjs.org/@peculiar/utils/-/utils-2.0.3.tgz",
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+      "license": "MIT",
+      "dependencies": {
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+      }
+    },
+    "node_modules/@peculiar/x509": {
+      "version": "2.1.0",
+      "resolved": "https://registry.npmjs.org/@peculiar/x509/-/x509-2.1.0.tgz",
+      "integrity": "sha512-IYbg1R03CSQGWwl24kGyqrdVtixNSbRaDvBg1r5wyYjTP+VwPQkka1BzTgU5+vxiuwqg04OxdvdJ1xYYFIdUSA==",
+      "license": "MIT",
+      "dependencies": {
+        "@peculiar/asn1-cms": "^2.9.4",
+        "@peculiar/asn1-csr": "^2.9.4",
+        "@peculiar/asn1-ecc": "^2.9.4",
+        "@peculiar/asn1-pkcs9": "^2.9.4",
+        "@peculiar/asn1-rsa": "^2.9.4",
+        "@peculiar/asn1-schema": "^2.9.4",
+        "@peculiar/asn1-x509": "^2.9.4",
+        "@peculiar/asn1-x509-post-quantum": "^2.9.4",
+        "pvtsutils": "^1.3.6",
+        "tslib": "^2.8.1",
+        "tsyringe": "^4.10.0"
+      },
+      "engines": {
+        "node": ">=20.0.0"
+      }
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     "node_modules/@pkgjs/parseargs": {
       "version": "0.11.0",
       "resolved": "https://registry.npmjs.org/@pkgjs/parseargs/-/parseargs-0.11.0.tgz",
@@ -1536,6 +1783,33 @@
         "win32"
       ]
     },
+    "node_modules/@simplewebauthn/browser": {
+      "version": "14.0.0",
+      "resolved": "https://registry.npmjs.org/@simplewebauthn/browser/-/browser-14.0.0.tgz",
+      "integrity": "sha512-1odWVqeEBTl7lJ9zMKLEsmTlnyrDO5iRcTvfMKKk1WThUnp/i8JJdffdj2icP+tty159s4PgwE3BiMoEW9NFow==",
+      "license": "MIT"
+    },
+    "node_modules/@simplewebauthn/server": {
+      "version": "14.0.2",
+      "resolved": "https://registry.npmjs.org/@simplewebauthn/server/-/server-14.0.2.tgz",
+      "integrity": "sha512-g+m/xv9/8FRWsDY22CwsTYRzt3WwS9fJrR3P7eY3Ti01FXH5FQ36Xn55v6D+5tb6VajlqOj4hywP/Vxsb6a3Sg==",
+      "license": "MIT",
+      "dependencies": {
+        "@hexagon/base64": "^1.1.27",
+        "@levischuck/tiny-cbor": "^0.2.2",
+        "@peculiar/asn1-android": "^2.6.0",
+        "@peculiar/asn1-ecc": "^2.6.1",
+        "@peculiar/asn1-rsa": "^2.6.1",
+        "@peculiar/asn1-schema": "^2.6.0",
+        "@peculiar/asn1-x509": "^2.6.1",
+        "@peculiar/asn1-x509-post-quantum": "^2.9.4",
+        "@peculiar/x509": "^2.1.0",
+        "reflect-metadata": "^0.2.2"
+      },
+      "engines": {
+        "node": ">=20.0.0"
+      }
+    },
     "node_modules/@tailwindcss/node": {
       "version": "4.2.4",
       "resolved": "https://registry.npmjs.org/@tailwindcss/node/-/node-4.2.4.tgz",
@@ -1905,6 +2179,20 @@
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     },
+    "node_modules/asn1js": {
+      "version": "3.0.10",
+      "resolved": "https://registry.npmjs.org/asn1js/-/asn1js-3.0.10.tgz",
+      "integrity": "sha512-S2s3aOytiKdFRdulw2qPE51MzjzVOisppcVv7jVFR+Kw0kxwvFrDcYA0h7Ndqbmj0HkMIXYWaoj7fli8kgx1eg==",
+      "license": "BSD-3-Clause",
+      "dependencies": {
+        "pvtsutils": "^1.3.6",
+        "pvutils": "^1.1.5",
+        "tslib": "^2.8.1"
+      },
+      "engines": {
+        "node": ">=12.0.0"
+      }
+    },
     "node_modules/babel-dead-code-elimination": {
       "version": "1.0.12",
       "resolved": "https://registry.npmjs.org/babel-dead-code-elimination/-/babel-dead-code-elimination-1.0.12.tgz",
@@ -4190,6 +4478,24 @@
         "once": "^1.3.1"
       }
     },
+    "node_modules/pvtsutils": {
+      "version": "1.3.6",
+      "resolved": "https://registry.npmjs.org/pvtsutils/-/pvtsutils-1.3.6.tgz",
+      "integrity": "sha512-PLgQXQ6H2FWCaeRak8vvk1GW462lMxB5s3Jm673N82zI4vqtVUPuZdffdZbPDFRoU8kAhItWFtPCWiPpp4/EDg==",
+      "license": "MIT",
+      "dependencies": {
+        "tslib": "^2.8.1"
+      }
+    },
+    "node_modules/pvutils": {
+      "version": "1.2.0",
+      "resolved": "https://registry.npmjs.org/pvutils/-/pvutils-1.2.0.tgz",
+      "integrity": "sha512-BbubeCEyTuQjVMakvJQ/Sxbc93F2pwmbsxONT/ZRrwU7Ua38d8unYTwXpTVLAKJ4BDuH9IGztCjQcd/N/39Dvg==",
+      "license": "MIT",
+      "engines": {
+        "node": ">=16.0.0"
+      }
+    },
     "node_modules/qs": {
       "version": "6.14.2",
       "resolved": "https://registry.npmjs.org/qs/-/qs-6.14.2.tgz",
@@ -4329,6 +4635,12 @@
         "url": "https://paulmillr.com/funding/"
       }
     },
+    "node_modules/reflect-metadata": {
+      "version": "0.2.2",
+      "resolved": "https://registry.npmjs.org/reflect-metadata/-/reflect-metadata-0.2.2.tgz",
+      "integrity": "sha512-urBwgfrvVP/eAyXx4hluJivBKzuEbSQs9rKWCrCkbSxNv8mxPcUZKeuoF3Uy4mJl3Lwprp6yy5/39VWigZ4K6Q==",
+      "license": "Apache-2.0"
+    },
     "node_modules/resolve-pkg-maps": {
       "version": "1.0.0",
       "resolved": "https://registry.npmjs.org/resolve-pkg-maps/-/resolve-pkg-maps-1.0.0.tgz",
@@ -4912,9 +5224,7 @@
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-      "dev": true,
-      "optional": true
+      "integrity": "sha512-oJFu94HQb+KVduSUQL7wnpmqnfmLsOA/nAh6b6EH0wCEoK0/mPeXU6c3wKDV83MkOuHPRHtSXKKU99IBazS/2w=="
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     "node_modules/tsx": {
       "version": "4.21.0",
@@ -5420,6 +5730,24 @@
         "@esbuild/win32-x64": "0.27.7"
       }
     },
+    "node_modules/tsyringe": {
+      "version": "4.10.0",
+      "resolved": "https://registry.npmjs.org/tsyringe/-/tsyringe-4.10.0.tgz",
+      "integrity": "sha512-axr3IdNuVIxnaK5XGEUFTu3YmAQ6lllgrvqfEoR16g/HGnYY/6We4oWENtAnzK6/LpJ2ur9PAb80RBt7/U4ugw==",
+      "license": "MIT",
+      "dependencies": {
+        "tslib": "^1.9.3"
+      },
+      "engines": {
+        "node": ">= 6.0.0"
+      }
+    },
+    "node_modules/tsyringe/node_modules/tslib": {
+      "version": "1.14.1",
+      "resolved": "https://registry.npmjs.org/tslib/-/tslib-1.14.1.tgz",
+      "integrity": "sha512-Xni35NKzjgMrwevysHTCArtLDpPvye8zV/0E4EyYn43P7/7qvQwPh9BGkHewbMulVntbigmcT7rdX3BNo9wRJg==",
+      "license": "0BSD"
+    },
     "node_modules/tunnel-agent": {
       "version": "0.6.0",
       "resolved": "https://registry.npmjs.org/tunnel-agent/-/tunnel-agent-0.6.0.tgz",
diff --git a/package.json b/package.json
index 5232259..ea13320 100644
--- a/package.json
+++ b/package.json
@@ -13,6 +13,8 @@
   "dependencies": {
     "@react-router/node": "^7.3.0",
     "@react-router/serve": "^7.3.0",
+    "@simplewebauthn/browser": "^14.0.0",
+    "@simplewebauthn/server": "^14.0.2",
     "better-sqlite3": "^12.9.0",
     "cheerio": "^1.2.0",
     "isbot": "^5.1.36",