:root {
  --bg: #f4f7fb;
  --surface: #ffffff;
  --surface-2: #eef3f9;
  --panel: #ffffff;
  --line: #d7e0ea;
  --text: #132033;
  --muted: #5f6f85;
  --primary: #0f766e;
  --primary-2: #155e75;
  --success: #16a34a;
  --warning: #d97706;
  --danger: #dc2626;
  --radius: 16px;
  --shadow: 0 12px 32px rgba(15, 23, 42, .08);
}
html[data-theme="dark"] {
  --bg: #0f172a;
  --surface: #111827;
  --surface-2: #1f2937;
  --panel: #0b1220;
  --line: #243042;
  --text: #e5eefc;
  --muted: #9fb0c9;
  --primary: #38bdf8;
  --primary-2: #0ea5e9;
  --success: #22c55e;
  --warning: #f59e0b;
  --danger: #ef4444;
  --shadow: 0 20px 40px rgba(0,0,0,.35);
}
* { box-sizing: border-box; }
html, body { margin: 0; padding: 0; background: var(--bg); color: var(--text); font-family: Inter, ui-sans-serif, system-ui, sans-serif; min-height: 100%; }
a { color: inherit; text-decoration: none; }
button, input, textarea, select { font: inherit; }
button { cursor: pointer; }
textarea, input, select { background: var(--surface); color: var(--text); border: 1px solid var(--line); border-radius: 12px; padding: 12px 14px; width: 100%; }
#app { min-height: 100vh; }
.skip-link { position: absolute; left: -9999px; top: auto; }
.skip-link:focus { left: 16px; top: 16px; background: white; color: black; padding: 8px 12px; border-radius: 8px; }
.shell { display: grid; grid-template-columns: 300px 1fr; min-height: 100vh; }
.sidebar { border-right: 1px solid var(--line); background: var(--surface); padding: 24px; display: grid; gap: 20px; }
.brand-lockup { display:flex; align-items:center; gap:14px; }
.brand-mark { width:42px; height:42px; border-radius:12px; display:grid; place-items:center; font-weight:800; color:#fff; background: linear-gradient(135deg, var(--primary), var(--primary-2)); }
.sidebar h1 { margin: 0; font-size: 22px; }
.sidebar-nav { display: grid; gap: 8px; }
.nav-link { padding: 12px 14px; border-radius: 12px; color: var(--muted); }
.nav-link.active, .nav-link:hover { background: color-mix(in srgb, var(--primary) 12%, transparent); color: var(--text); }
.main { padding: 24px; display:grid; gap:16px; }
.global-topbar { display:flex; align-items:center; justify-content:space-between; }
.toolbar-actions { display:flex; flex-wrap:wrap; gap:12px; }
.page { max-width: 1280px; margin: 0 auto; width:100%; }
.page-header { display: flex; align-items: center; justify-content: space-between; gap: 16px; margin-bottom: 24px; }
.page-title { margin: 0; font-size: 28px; }
.card { background: var(--panel); border: 1px solid var(--line); border-radius: var(--radius); box-shadow: var(--shadow); }
.panel { padding: 20px; }
.compact { padding: 14px 16px; }
.grid { display: grid; gap: 16px; }
.grid-2 { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 16px; }
.grid-3 { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 16px; }
.grid-4 { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 16px; }
.auth-wrap { min-height: 100vh; display: grid; place-items: center; padding: 24px; }
.auth-card { width: min(520px, 100%); padding: 28px; }
.brand-kicker { color: var(--primary); font-size: 13px; text-transform: uppercase; letter-spacing: .12em; margin-bottom: 8px; }
.lead { color: var(--muted); line-height: 1.6; }
.form-grid { display: grid; gap: 14px; margin-top: 20px; }
.btn-row { display: flex; flex-wrap: wrap; gap: 12px; }
.btn { border: 0; border-radius: 12px; padding: 12px 16px; font-weight: 600; }
.btn-primary { background: linear-gradient(135deg, var(--primary), var(--primary-2)); color: #ffffff; }
.btn-secondary { background: var(--surface); color: var(--text); border: 1px solid var(--line); }
.btn-danger { background: color-mix(in srgb, var(--danger) 14%, transparent); color: var(--danger); border: 1px solid color-mix(in srgb, var(--danger) 22%, transparent); }
.stat { padding: 20px; }
.stat .label { color: var(--muted); font-size: 13px; text-transform: uppercase; letter-spacing: .08em; }
.stat .value { font-size: 32px; margin-top: 10px; font-weight: 800; }
.room-list, .message-list { display: grid; gap: 12px; }
.room-item, .message-item { padding: 16px; border-radius: 14px; border: 1px solid var(--line); background: var(--surface); }
.room-button { width:100%; text-align:left; }
.message-meta { font-size: 12px; color: var(--muted); margin-bottom: 8px; }
.chat-layout { display: grid; grid-template-columns: 320px 1fr; gap: 16px; }
.chat-pane { min-height: 72vh; display: grid; grid-template-rows: auto 1fr auto; }
.chat-messages { padding: 20px; overflow: auto; display: grid; gap: 12px; }
.chat-input { border-top: 1px solid var(--line); padding: 16px; display: grid; gap: 12px; }
.topbar { display: flex; align-items: center; justify-content: space-between; gap: 16px; margin-bottom: 16px; }
.badge { display: inline-flex; align-items: center; gap: 8px; border-radius: 999px; padding: 8px 12px; background: color-mix(in srgb, var(--primary) 12%, transparent); color: var(--primary); font-size: 13px; }
.notice { padding: 14px 16px; border-radius: 12px; border: 1px solid color-mix(in srgb, var(--warning) 24%, transparent); background: color-mix(in srgb, var(--warning) 10%, transparent); color: var(--warning); }
.muted { color: var(--muted); }
.list-table { width: 100%; border-collapse: collapse; }
.list-table th, .list-table td { text-align: left; padding: 12px 10px; border-bottom: 1px solid var(--line); vertical-align: top; }
.empty { padding: 32px; text-align: center; color: var(--muted); }
.session-name { font-size: 18px; font-weight: 700; margin: 6px 0 10px; }
@media (max-width: 1100px) {
  .shell { grid-template-columns: 1fr; }
  .sidebar { border-right: 0; border-bottom: 1px solid var(--line); }
  .chat-layout, .grid-2, .grid-3, .grid-4 { grid-template-columns: 1fr; }
  .global-topbar { align-items:flex-start; flex-direction:column; }
}