feat(frontend): bake Fabric-purple Hangman Lab logo as brand asset

public/brand-logo.svg = ~/hangman-lab-logo-black.svg recolored #000000 -> #9333ea (Fabric deep purple). Dockerfile writes .env.production at build (context .env* is dockerignored) so VITE_APP_NAME/LOGO_URL/FAVICON_URL bake in; logo+favicon -> the mark. Overridable via build args. Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
feat(frontend): OIDC login + runtime env (FABRIC_OIDC_ONLY/FIX_TO_CENTER)
2026-05-18 10:02:14 +01:00 · 2026-05-18 09:44:49 +01:00 · 2026-05-18 09:18:21 +01:00
16 changed files with 503 additions and 87 deletions
--- a/.env.example
+++ b/.env.example
@@ -2,3 +2,8 @@ VITE_CENTER_API_BASE=http://localhost:7001/api
 VITE_GUILD_API_BASE=http://localhost:7002/api
 VITE_GUILD_SOCKET_BASE=http://localhost:7002/realtime
 VITE_API_KEY=change-me-api-key
+
+# Brand overrides (build-time only; baked at build). Leave empty for Fabric defaults.
+VITE_APP_NAME=Fabric
+VITE_LOGO_URL=
+VITE_FAVICON_URL=
--- a/17
+++ b/17
@@ -5,11 +5,28 @@ COPY package*.json ./
 RUN npm ci

 COPY . .
+
+# Brand is baked at build (Vite VITE_* are build-time). Written here, not
+# via a context .env (.dockerignore excludes .env*). public/brand-logo.svg
+# ships the Fabric-purple Hangman Lab mark; override args if rebranding.
+ARG VITE_APP_NAME=Fabric
+ARG VITE_LOGO_URL=/brand-logo.svg
+ARG VITE_FAVICON_URL=/brand-logo.svg
+RUN printf 'VITE_APP_NAME=%s\nVITE_LOGO_URL=%s\nVITE_FAVICON_URL=%s\n' \
+      "$VITE_APP_NAME" "$VITE_LOGO_URL" "$VITE_FAVICON_URL" > .env.production
 RUN npm run build

 FROM nginx:1.27-alpine AS runtime
 COPY docker/nginx.conf /etc/nginx/conf.d/default.conf
+COPY docker/entrypoint.sh /docker-entrypoint-fabric.sh
 COPY --from=build /app/dist /usr/share/nginx/html
+RUN chmod +x /docker-entrypoint-fabric.sh
+
+# Runtime SPA config (see docker/entrypoint.sh). Override at `docker run`
+# / compose: empty values keep prior behavior.
+ENV FABRIC_OIDC_ONLY=""
+ENV FIX_TO_CENTER=""

 EXPOSE 80
+ENTRYPOINT ["/docker-entrypoint-fabric.sh"]
 CMD ["nginx", "-g", "daemon off;"]
--- a/docker/entrypoint.sh
+++ b/docker/entrypoint.sh
@@ -0,0 +1,20 @@
+#!/bin/sh
+set -e
+
+# Inject container env into the static SPA at runtime. The app loads
+# /runtime-env.js (see index.html) before its bundle.
+#   FABRIC_OIDC_ONLY  - "true" hides the username/password login form
+#   FIX_TO_CENTER     - non-empty pins the Center API base + hides its input
+ONLY="false"
+case "$(printf '%s' "${FABRIC_OIDC_ONLY:-}" | tr '[:upper:]' '[:lower:]')" in
+  1|true|yes|on) ONLY="true" ;;
+esac
+
+# JSON-escape FIX_TO_CENTER (backslash + double-quote)
+FIX="$(printf '%s' "${FIX_TO_CENTER:-}" | sed 's/\\/\\\\/g; s/"/\\"/g')"
+
+cat > /usr/share/nginx/html/runtime-env.js <<EOF
+window.__FABRIC_ENV__ = { oidcOnly: ${ONLY}, fixToCenter: "${FIX}" };
+EOF
+
+exec "$@"
--- a/index.html
+++ b/index.html
@@ -8,11 +8,19 @@
    <link rel="icon" type="image/png" sizes="256x256" href="/favicon.png?v=3" />
    <link rel="apple-touch-icon" sizes="180x180" href="/apple-touch-icon.png?v=3" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
-    <meta name="theme-color" content="#000000" />
+    <meta name="theme-color" content="#080a0d" />
+    <link rel="preconnect" href="https://fonts.googleapis.com" />
+    <link rel="preconnect" href="https://fonts.gstatic.com" crossorigin />
+    <link
+      href="https://fonts.googleapis.com/css2?family=Major+Mono+Display&family=IBM+Plex+Mono:ital,wght@0,400;0,500;0,600;1,400&display=swap"
+      rel="stylesheet"
+    />
    <title>Fabric</title>
  </head>
  <body>
    <div id="root"></div>
+    <!-- runtime container env (generated by docker/entrypoint.sh); absent in dev -->
+    <script src="/runtime-env.js"></script>
    <script type="module" src="/src/main.tsx"></script>
  </body>
 </html>
--- a/public/brand-logo.svg
+++ b/public/brand-logo.svg
@@ -0,0 +1,44 @@
+<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 733.000000 733.000000" role="img" aria-label="Hangman Lab">
+<g transform="translate(0.000000,733.000000) scale(0.100000,-0.100000)"
+fill="#9333ea" stroke="none">
+<path d="M812 6860 c-66 -40 -73 -66 -70 -242 3 -141 5 -159 24 -185 43 -58
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+61 379 26 164 26 164 -5 188 -42 33 -54 58 -61 121 -5 54 -5 54 -92 87 -98 38
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+-144 -80 -113 -54 22 -65 83 -22 125 30 31 67 27 102 -12z"/>
+</g>
+</svg>
--- a/src/App.tsx
+++ b/src/App.tsx
@@ -3,6 +3,7 @@ import ProtectedRoute from './auth/ProtectedRoute'
 import AppLayout from './layouts/AppLayout'
 import ChatPage from './pages/ChatPage'
 import LoginPage from './pages/LoginPage'
+import OidcCallback from './pages/OidcCallback'

 export default function App() {
  return (
@@ -26,6 +27,7 @@ export default function App() {
          }
        />
        <Route path="login" element={<LoginPage />} />
+        <Route path="oidc" element={<OidcCallback />} />
      </Route>
      <Route path="*" element={<Navigate to="/workspace" replace />} />
    </Routes>
--- a/src/auth/AuthContext.tsx
+++ b/src/auth/AuthContext.tsx
@@ -18,6 +18,11 @@ export function AuthProvider({ children }: PropsWithChildren) {
        setAuthSession(next)
        setSession(next)
      },
+      // Adopt a session obtained out-of-band (OIDC ticket exchange).
+      adoptSession: (next: AuthSession) => {
+        setAuthSession(next)
+        setSession(next)
+      },
      logout: async () => {
        if (session?.refreshToken) {
          try {
--- a/src/auth/auth-context.ts
+++ b/src/auth/auth-context.ts
@@ -5,6 +5,7 @@ export type AuthContextValue = {
  session: AuthSession | null
  isAuthed: boolean
  login: (centerApiBase: string, email: string, password: string) => Promise<void>
+  adoptSession: (session: AuthSession) => void
  logout: () => Promise<void>
  ensureFreshToken: () => Promise<string | null>
  refreshGuilds: () => Promise<void>
--- a/src/index.css
+++ b/src/index.css
@@ -1,28 +1,32 @@
 :root {
-  --rail: #18191c;
-  --side: #1f2125;
-  --main: #26282d;
-  --elevated: #1a1b1e;
-  --input: #1a1b1e;
-  --hover: rgba(255, 255, 255, 0.04);
-  --active: rgba(168, 85, 247, 0.16);
+  /* Cryptic lab terminal: deep "blueprint" ink surfaces, monospace
+     everything, restrained motion. Accent stays Fabric purple. */
+  --ink: #080a0d;
+  --rail: #0b0e12;
+  --side: #0f141b;
+  --main: #0a0d12;
+  --elevated: #11161d;
+  --input: #0b0e12;
+  --hover: rgba(168, 85, 247, 0.1);
+  --active: rgba(168, 85, 247, 0.18);

-  --text: #dbdee1;
-  --text-muted: #949ba4;
-  --text-faint: #6d7178;
-  --text-h: #f2f3f5;
+  --text: #c7d0dc;
+  --text-muted: #6f7d92;
+  --text-faint: #4f5b6b;
+  --text-h: #e9f0fa;

-  --border: #303237;
+  --border: #1d2733;
  --accent: #a855f7;
  --accent-strong: #9333ea;
-  --accent-soft: rgba(168, 85, 247, 0.14);
-  --danger: #f23f42;
+  --accent-soft: rgba(168, 85, 247, 0.16);
+  --danger: #ff5a52;
  --online: #23a55a;

-  --radius: 10px;
-  --radius-sm: 7px;
-  --sans: 'Inter', system-ui, 'Segoe UI', Roboto, sans-serif;
-  --mono: ui-monospace, 'SF Mono', Consolas, monospace;
+  --radius: 12px;
+  --radius-sm: 8px;
+  --display: 'Major Mono Display', ui-monospace, monospace;
+  --sans: 'IBM Plex Mono', ui-monospace, 'SF Mono', Consolas, monospace;
+  --mono: 'IBM Plex Mono', ui-monospace, 'SF Mono', Consolas, monospace;

  color-scheme: dark;
  font-synthesis: none;
@@ -198,6 +202,27 @@ button {
  padding: 32px;
  box-shadow: 0 20px 50px -20px rgba(0, 0, 0, 0.6);
 }
+.brand-wordmark {
+  font-family: var(--display);
+  text-transform: lowercase;
+  font-size: 30px;
+  color: var(--accent);
+  text-shadow: 0 0 32px rgba(168, 85, 247, 0.4);
+  margin-bottom: 18px;
+}
+.brand-logo {
+  max-height: 44px;
+  width: auto;
+  margin-bottom: 18px;
+}
+.login-or {
+  text-align: center;
+  color: var(--text-faint);
+  font-size: 11px;
+  letter-spacing: 0.18em;
+  text-transform: uppercase;
+  margin: 14px 0;
+}
 .login-card h1 {
  font-size: 24px;
  margin-bottom: 4px;
@@ -415,6 +440,20 @@ button {
 .chan-btn.xt-custom {
  --xt: #c084fc;
 }
+.chan-btn.xt-dm {
+  --xt: #a855f7;
+}
+/* x-type group headers in the channel sidebar */
+.dc-chan-group {
+  margin-bottom: 6px;
+}
+.dc-group-label {
+  font-size: 10px;
+  letter-spacing: 0.18em;
+  text-transform: uppercase;
+  color: var(--text-faint);
+  padding: 8px 8px 4px;
+}
 .chan-tag {
  margin-left: auto;
  font-size: 10px;
--- a/src/lib/brand.ts
+++ b/src/lib/brand.ts
@@ -0,0 +1,21 @@
+// Build-time brand overrides. Values are baked from VITE_ env at build
+// (not runtime-configurable by design). Empty/unset → Fabric defaults.
+const env = import.meta.env as unknown as Record<string, string | undefined>
+
+export const APP_NAME = (env.VITE_APP_NAME ?? '').trim() || 'Fabric'
+export const LOGO_URL = (env.VITE_LOGO_URL ?? '').trim()
+const FAVICON_URL = (env.VITE_FAVICON_URL ?? '').trim()
+
+// Apply the document title + favicon override once at startup.
+export function applyBrand(): void {
+  document.title = APP_NAME
+  if (FAVICON_URL) {
+    document
+      .querySelectorAll('link[rel~="icon"], link[rel="apple-touch-icon"]')
+      .forEach((n) => n.remove())
+    const link = document.createElement('link')
+    link.rel = 'icon'
+    link.href = FAVICON_URL
+    document.head.appendChild(link)
+  }
+}
--- a/src/lib/center-auth-client.ts
+++ b/src/lib/center-auth-client.ts
@@ -82,6 +82,20 @@ export async function guildMembersCenter(
  return Array.isArray(res.data) ? res.data : []
 }

+export async function oidcStatusCenter(centerApiBase: string): Promise<{ enabled: boolean }> {
+  try {
+    const res = await centerClient(centerApiBase).get<{ enabled: boolean }>('/auth/oidc/status')
+    return { enabled: !!res.data?.enabled }
+  } catch {
+    return { enabled: false }
+  }
+}
+
+export async function oidcExchangeCenter(centerApiBase: string, ticket: string): Promise<AuthSession> {
+  const res = await centerClient(centerApiBase).post<LoginResponse>('/auth/oidc/exchange', { ticket })
+  return { ...res.data, centerApiBase }
+}
+
 export async function updateMeNameCenter(
  centerApiBase: string,
  accessToken: string,
--- a/src/lib/runtime-env.ts
+++ b/src/lib/runtime-env.ts
@@ -0,0 +1,37 @@
+// Runtime (container) env, injected by the Docker entrypoint into
+// /runtime-env.js as window.__FABRIC_ENV__ (NOT build-time). Empty/unset
+// keeps the prior behavior.
+type FabricEnv = { oidcOnly?: boolean; fixToCenter?: string }
+
+const env: FabricEnv =
+  (typeof window !== 'undefined' && (window as unknown as { __FABRIC_ENV__?: FabricEnv }).__FABRIC_ENV__) || {}
+
+// FABRIC_OIDC_ONLY: hide the username/password form (SSO is the only login).
+export const OIDC_ONLY = env.oidcOnly === true
+
+// FIX_TO_CENTER: when non-empty, the Center API base is pinned to this and
+// the login page no longer shows the "Center API Base" input.
+export const FIXED_CENTER = (env.fixToCenter ?? '').trim()
+
+export const DEFAULT_CENTER = 'http://localhost:7001/api'
+
+// Where OIDC exchange should call back to. FIX_TO_CENTER wins; otherwise
+// the value the user used to start SSO (persisted before redirect).
+const OIDC_CENTER_KEY = 'fabric.oidc.center.v1'
+export function rememberOidcCenter(base: string): void {
+  try {
+    localStorage.setItem(OIDC_CENTER_KEY, base)
+  } catch {
+    // ignore
+  }
+}
+export function resolveCenterBase(): string {
+  if (FIXED_CENTER) return FIXED_CENTER
+  try {
+    const v = localStorage.getItem(OIDC_CENTER_KEY)
+    if (v) return v
+  } catch {
+    // ignore
+  }
+  return DEFAULT_CENTER
+}
--- a/src/main.tsx
+++ b/src/main.tsx
@@ -4,6 +4,9 @@ import { BrowserRouter, HashRouter } from 'react-router-dom'
 import './index.css'
 import App from './App.tsx'
 import { AuthProvider } from './auth/AuthContext'
+import { applyBrand } from './lib/brand'
+
+applyBrand()

 // The packaged desktop app loads the bundled SPA over file://, where the
 // History API has no server to back path routing — use HashRouter there.
--- a/src/pages/ChatPage.tsx
+++ b/src/pages/ChatPage.tsx
@@ -9,6 +9,7 @@ import {
 } from 'react'
 import { useAuth } from '../auth/auth-context'
 import { renderMarkdown } from '../lib/markdown'
+import { APP_NAME } from '../lib/brand'
 import { guildMembersCenter, joinGuildCenter } from '../lib/center-auth-client'

 type Attachment = { url: string; name?: string; mimeType?: string }
@@ -67,7 +68,13 @@ function timeOf(iso?: string): string {
  return d.toLocaleTimeString([], { hour: '2-digit', minute: '2-digit' })
 }

-const X_TYPES = ['general', 'work', 'report', 'discuss', 'triage', 'custom'] as const
+const X_TYPES = ['general', 'work', 'report', 'discuss', 'triage', 'custom', 'dm'] as const
+// display order + labels for the x-type-grouped channel sidebar
+const XTYPE_ORDER = ['general', 'work', 'report', 'discuss', 'triage', 'custom', 'dm'] as const
+const XTYPE_LABEL: Record<string, string> = {
+  general: 'General', work: 'Work', report: 'Report',
+  discuss: 'Discussion', triage: 'Triage', custom: 'Custom', dm: 'Direct Messages',
+}
 type XType = (typeof X_TYPES)[number]

 type GuildChannel = { id: string; name: string; guildId?: string; xType?: XType; isMember?: boolean; isPublic?: boolean; closed?: boolean }
@@ -412,13 +419,17 @@ export default function ChatPage() {
      setError('Triage channels require an on-duty user')
      return
    }
+    if (newChannelXType === 'dm' && selectedMemberIds.length !== 1) {
+      setError('A DM needs exactly one other participant')
+      return
+    }
    setError('')
    try {
      const payload = {
        name: newChannelName.trim(),
        guildId: effectiveGuildId,
        xType: newChannelXType,
-        isPublic: newChannelPublic,
+        isPublic: newChannelXType === 'dm' ? false : newChannelPublic,
        memberUserIds: selectedMemberIds,
        onDuty: newChannelXType === 'triage' ? newChannelOnDuty : undefined,
        listeners: newChannelXType === 'custom' ? newChannelListeners : [],
@@ -444,6 +455,33 @@ export default function ChatPage() {
    }
  }

+  // DM channels are not unique: this always creates a fresh 1:1 dm channel
+  // between the current user and `m` (private; no rotation/wakeup).
+  async function createDmChannel(m: { userId: string; name?: string; email?: string }) {
+    if (!guild || !guildToken) return
+    const effectiveGuildId = guildDbId || selectedGuildId
+    if (!effectiveGuildId) {
+      setError('Cannot create DM: no guild selected')
+      return
+    }
+    const label = m.name || m.email || m.userId.slice(0, 8)
+    setError('')
+    try {
+      const res = await guildApi().post('/channels', {
+        name: `DM · ${label}`,
+        guildId: effectiveGuildId,
+        xType: 'dm',
+        isPublic: false,
+        memberUserIds: [m.userId],
+      })
+      const createdId = res.data?.id as string | undefined
+      await loadChannels()
+      if (createdId) setSelectedChannelId(createdId)
+    } catch {
+      setError('Failed to create DM channel')
+    }
+  }
+
  async function joinChannel(c: GuildChannel) {
    if (!guild || !guildToken) return
    try {
@@ -700,6 +738,15 @@ export default function ChatPage() {
      { kind: 'item', label: 'Copy user ID', onClick: () => copyText(m.userId) },
      { kind: 'item', label: 'Copy name', onClick: () => copyText(label) },
    ]
+    if (!isSelf)
+      items.push(
+        { kind: 'sep' },
+        {
+          kind: 'item',
+          label: 'Create new DM channel',
+          onClick: () => void createDmChannel(m),
+        },
+      )
    if (inChannel && rotationChannel && !bypassMemberIds.includes(m.userId))
      items.push(
        { kind: 'sep' },
@@ -920,7 +967,7 @@ export default function ChatPage() {
  }

  return (
-    <div className="dc-shell" onContextMenu={(e) => openCtx(e, 'Fabric', blankMenu('root'))}>
+    <div className="dc-shell" onContextMenu={(e) => openCtx(e, APP_NAME, blankMenu('root'))}>
      <nav className="dc-rail" onContextMenu={(e) => openCtx(e, 'Guilds', blankMenu('guilds'))}>
        {guilds.map((g) => (
          <button
@@ -952,17 +999,25 @@ export default function ChatPage() {
            </button>
          </div>
          {channels.length ? (
-            channels.map((c) => (
-              <button
-                key={c.id}
-                className={`chan-btn xt-${c.xType ?? 'general'} ${selectedChannelId === c.id ? 'active' : ''}`}
-                onClick={() => setSelectedChannelId(c.id)}
-                onContextMenu={(e) => openCtx(e, `#${c.name}`, channelMenu(c))}
-              >
-                <span className="hash">#</span>
-                <span style={{ overflow: 'hidden', textOverflow: 'ellipsis', whiteSpace: 'nowrap' }}>{c.name}</span>
-                {c.xType ? <span className="chan-tag">{c.xType}</span> : null}
-              </button>
+            XTYPE_ORDER.filter((xt) =>
+              channels.some((c) => (c.xType ?? 'general') === xt),
+            ).map((xt) => (
+              <div key={xt} className="dc-chan-group">
+                <div className="dc-group-label">{XTYPE_LABEL[xt] ?? xt}</div>
+                {channels
+                  .filter((c) => (c.xType ?? 'general') === xt)
+                  .map((c) => (
+                    <button
+                      key={c.id}
+                      className={`chan-btn xt-${c.xType ?? 'general'} ${selectedChannelId === c.id ? 'active' : ''}`}
+                      onClick={() => setSelectedChannelId(c.id)}
+                      onContextMenu={(e) => openCtx(e, `#${c.name}`, channelMenu(c))}
+                    >
+                      <span className="hash">#</span>
+                      <span style={{ overflow: 'hidden', textOverflow: 'ellipsis', whiteSpace: 'nowrap' }}>{c.name}</span>
+                    </button>
+                  ))}
+              </div>
            ))
          ) : (
            <div className="dc-empty">{guild ? 'No channels yet' : 'Pick a guild from the left'}</div>
@@ -1373,33 +1428,61 @@ export default function ChatPage() {
              </div>
            ) : null}

-            <label className="check-row" style={{ marginTop: 10 }}>
-              <input type="checkbox" checked={newChannelPublic} onChange={(e) => setNewChannelPublic(e.target.checked)} />
-              <span>Public — visible to all guild members</span>
-            </label>
-            <p className="muted" style={{ marginTop: 8, fontSize: 13 }}>
-              {newChannelPublic
-                ? "You're added automatically; every guild member can see it."
-                : "You're added automatically. Pick who else to include:"}
-            </p>
-            <div className="modal-list">
-              {members
-                .filter((m) => m.userId !== session?.user.id)
-                .map((m) => (
-                  <label key={m.userId} className="check-row">
-                    <input
-                      type="checkbox"
-                      checked={selectedMemberIds.includes(m.userId)}
-                      disabled={newChannelPublic}
-                      onChange={() => toggleMember(m.userId)}
-                    />
-                    <span>{m.name || m.email}</span>
-                  </label>
-                ))}
-              {members.filter((m) => m.userId !== session?.user.id).length === 0 ? (
-                <div className="dc-empty">No other members in this guild.</div>
-              ) : null}
-            </div>
+            {newChannelXType === 'dm' ? (
+              <>
+                <p className="muted" style={{ marginTop: 10, fontSize: 13 }}>
+                  Direct message — private 1:1, not unique. Pick exactly one user:
+                </p>
+                <div className="modal-list">
+                  {members
+                    .filter((m) => m.userId !== session?.user.id)
+                    .map((m) => (
+                      <label key={m.userId} className="check-row">
+                        <input
+                          type="radio"
+                          name="dm-target"
+                          checked={selectedMemberIds[0] === m.userId}
+                          onChange={() => setSelectedMemberIds([m.userId])}
+                        />
+                        <span>{m.name || m.email}</span>
+                      </label>
+                    ))}
+                  {members.filter((m) => m.userId !== session?.user.id).length === 0 ? (
+                    <div className="dc-empty">No other members in this guild.</div>
+                  ) : null}
+                </div>
+              </>
+            ) : (
+              <>
+                <label className="check-row" style={{ marginTop: 10 }}>
+                  <input type="checkbox" checked={newChannelPublic} onChange={(e) => setNewChannelPublic(e.target.checked)} />
+                  <span>Public — visible to all guild members</span>
+                </label>
+                <p className="muted" style={{ marginTop: 8, fontSize: 13 }}>
+                  {newChannelPublic
+                    ? "You're added automatically; every guild member can see it."
+                    : "You're added automatically. Pick who else to include:"}
+                </p>
+                <div className="modal-list">
+                  {members
+                    .filter((m) => m.userId !== session?.user.id)
+                    .map((m) => (
+                      <label key={m.userId} className="check-row">
+                        <input
+                          type="checkbox"
+                          checked={selectedMemberIds.includes(m.userId)}
+                          disabled={newChannelPublic}
+                          onChange={() => toggleMember(m.userId)}
+                        />
+                        <span>{m.name || m.email}</span>
+                      </label>
+                    ))}
+                  {members.filter((m) => m.userId !== session?.user.id).length === 0 ? (
+                    <div className="dc-empty">No other members in this guild.</div>
+                  ) : null}
+                </div>
+              </>
+            )}
            <div className="modal-actions">
              <button className="btn" onClick={createChannel}>Create</button>
              <button className="btn btn-secondary" onClick={() => setShowCreateChannelModal(false)}>Cancel</button>
--- a/src/pages/LoginPage.tsx
+++ b/src/pages/LoginPage.tsx
@@ -1,15 +1,29 @@
-import { useState } from 'react'
+import { useEffect, useState } from 'react'
 import type { FormEvent } from 'react'
 import { useNavigate } from 'react-router-dom'
 import { useAuth } from '../auth/auth-context'
+import { APP_NAME, LOGO_URL } from '../lib/brand'
+import { OIDC_ONLY, FIXED_CENTER, DEFAULT_CENTER, rememberOidcCenter } from '../lib/runtime-env'
+import { oidcStatusCenter } from '../lib/center-auth-client'

 export default function LoginPage() {
  const navigate = useNavigate()
  const { login, isAuthed, session } = useAuth()
-  const [centerApiBase, setCenterApiBase] = useState('http://localhost:7001/api')
+  const [centerApiBase, setCenterApiBase] = useState(FIXED_CENTER || DEFAULT_CENTER)
  const [email, setEmail] = useState('')
  const [password, setPassword] = useState('')
  const [error, setError] = useState('')
+  const [oidcEnabled, setOidcEnabled] = useState(false)
+
+  useEffect(() => {
+    let alive = true
+    oidcStatusCenter(centerApiBase.trim()).then((s) => {
+      if (alive) setOidcEnabled(s.enabled)
+    })
+    return () => {
+      alive = false
+    }
+  }, [centerApiBase])

  async function onSubmit(e: FormEvent) {
    e.preventDefault()
@@ -22,14 +36,29 @@ export default function LoginPage() {
    }
  }

+  function startOidc() {
+    const base = centerApiBase.trim().replace(/\/$/, '')
+    rememberOidcCenter(base)
+    window.location.href = `${base}/auth/oidc/start`
+  }
+
+  const showPasswordForm = !OIDC_ONLY
+  const showCenterInput = !FIXED_CENTER
+
  return (
    <div className="login-screen">
      <div className="login-card">
+        {LOGO_URL ? (
+          <img className="brand-logo" src={LOGO_URL} alt={APP_NAME} />
+        ) : (
+          <div className="brand-wordmark">{APP_NAME}</div>
+        )}
        <h1>Welcome back</h1>
        <p className="login-sub">
-          {isAuthed ? `Signed in as ${session?.user.email}` : 'Sign in to continue to Fabric'}
+          {isAuthed ? `Signed in as ${session?.user.email}` : `Sign in to continue to ${APP_NAME}`}
        </p>
-        <form onSubmit={onSubmit}>
+
+        {showCenterInput ? (
          <div className="field">
            <label>Center API Base</label>
            <input
@@ -39,29 +68,51 @@ export default function LoginPage() {
              placeholder="http://localhost:7001/api"
            />
          </div>
-          <div className="field">
-            <label>Email</label>
-            <input
-              className="input"
-              value={email}
-              onChange={(e) => setEmail(e.target.value)}
-              placeholder="you@example.com"
-              type="email"
-            />
-          </div>
-          <div className="field">
-            <label>Password</label>
-            <input
-              className="input"
-              value={password}
-              onChange={(e) => setPassword(e.target.value)}
-              placeholder="••••••••"
-              type="password"
-            />
-          </div>
-          {error ? <p className="error-text" style={{ marginBottom: 12 }}>{error}</p> : null}
-          <button className="btn" type="submit">Sign in</button>
-        </form>
+        ) : null}
+
+        {oidcEnabled ? (
+          <button className="btn" type="button" onClick={startOidc} style={{ width: '100%' }}>
+            Sign in with SSO
+          </button>
+        ) : null}
+
+        {OIDC_ONLY && !oidcEnabled ? (
+          <p className="error-text" style={{ marginTop: 12 }}>
+            SSO is not configured on this Center yet.
+          </p>
+        ) : null}
+
+        {showPasswordForm ? (
+          <>
+            {oidcEnabled ? <div className="login-or">or</div> : null}
+            <form onSubmit={onSubmit}>
+              <div className="field">
+                <label>Email</label>
+                <input
+                  className="input"
+                  value={email}
+                  onChange={(e) => setEmail(e.target.value)}
+                  placeholder="you@example.com"
+                  type="email"
+                />
+              </div>
+              <div className="field">
+                <label>Password</label>
+                <input
+                  className="input"
+                  value={password}
+                  onChange={(e) => setPassword(e.target.value)}
+                  placeholder="••••••••"
+                  type="password"
+                />
+              </div>
+              {error ? <p className="error-text" style={{ marginBottom: 12 }}>{error}</p> : null}
+              <button className="btn" type="submit">Sign in</button>
+            </form>
+          </>
+        ) : error ? (
+          <p className="error-text" style={{ marginTop: 12 }}>{error}</p>
+        ) : null}
      </div>
    </div>
  )
--- a/src/pages/OidcCallback.tsx
+++ b/src/pages/OidcCallback.tsx
@@ -0,0 +1,66 @@
+import { useEffect, useRef, useState } from 'react'
+import { useNavigate } from 'react-router-dom'
+import { useAuth } from '../auth/auth-context'
+import { APP_NAME } from '../lib/brand'
+import { resolveCenterBase } from '../lib/runtime-env'
+import { oidcExchangeCenter } from '../lib/center-auth-client'
+
+// Landing route for the OIDC redirect: Center bounces the browser here
+// with #oidc_ticket=... (or #oidc_error=...). We redeem the one-time
+// ticket for a full session and adopt it.
+export default function OidcCallback() {
+  const navigate = useNavigate()
+  const { adoptSession } = useAuth()
+  const [error, setError] = useState('')
+  const ran = useRef(false)
+
+  useEffect(() => {
+    if (ran.current) return
+    ran.current = true
+
+    const hash = window.location.hash.replace(/^#/, '')
+    const params = new URLSearchParams(hash)
+    const ticket = params.get('oidc_ticket')
+    const errParam = params.get('oidc_error')
+    // scrub the fragment so the ticket isn't left in the URL/history
+    window.history.replaceState(null, '', window.location.pathname)
+
+    if (errParam) {
+      setError(decodeURIComponent(errParam))
+      return
+    }
+    if (!ticket) {
+      setError('Missing OIDC ticket.')
+      return
+    }
+
+    oidcExchangeCenter(resolveCenterBase(), ticket)
+      .then((next) => {
+        adoptSession(next)
+        navigate('/workspace', { replace: true })
+      })
+      .catch(() => setError('SSO sign-in failed. The ticket may have expired — please try again.'))
+  }, [adoptSession, navigate])
+
+  return (
+    <div className="login-screen">
+      <div className="login-card">
+        <div className="brand-wordmark">{APP_NAME}</div>
+        {error ? (
+          <>
+            <h1>Sign-in failed</h1>
+            <p className="error-text" style={{ marginBottom: 16 }}>{error}</p>
+            <button className="btn" type="button" onClick={() => navigate('/login', { replace: true })}>
+              Back to sign in
+            </button>
+          </>
+        ) : (
+          <>
+            <h1>Signing you in…</h1>
+            <p className="login-sub">Completing SSO authentication.</p>
+          </>
+        )}
+      </div>
+    </div>
+  )
+}