:root { color-scheme: dark; }
* { box-sizing: border-box; }
body { margin: 0; font-family: Inter, Arial, sans-serif; background: #0f172a; color: #e2e8f0; }
.topbar { display:flex; justify-content:space-between; align-items:center; padding:16px 24px; background:#111827; border-bottom:1px solid #1f2937; }
.topbar-actions { display:flex; gap:12px; align-items:center; }
.container { max-width: 1180px; margin: 0 auto; padding: 24px; }
.hero, .chat-layout, .admin-grid { display:grid; gap:24px; }
.hero { grid-template-columns: 1.3fr 0.8fr; }
.chat-layout { grid-template-columns: 280px 1fr; }
.admin-grid { grid-template-columns: 1.5fr 0.9fr; }
.card { background:#111827; border:1px solid #1f2937; border-radius:16px; padding:24px; box-shadow:0 10px 30px rgba(0,0,0,.2); }
.auth-card, .narrow { max-width: 420px; }
.stack { display:grid; gap:16px; }
label { display:grid; gap:8px; font-size:14px; }
input, textarea, select, button { font: inherit; border-radius:10px; border:1px solid #334155; padding:12px; }
input, textarea, select { background:#020617; color:#e2e8f0; }
button { cursor:pointer; background:#2563eb; color:white; }
button.ghost { background:transparent; }
.messages { display:grid; gap:14px; margin-bottom:20px; max-height:60vh; overflow:auto; }
.message { padding:14px; border-radius:14px; }
.message.user { background:#172554; margin-left:80px; }
.message.assistant { background:#1e293b; margin-right:80px; }
.message-meta, .muted { color:#94a3b8; font-size:13px; }
.composer { display:grid; gap:12px; }
.error { color:#fca5a5; }
.success { color:#86efac; }
table { width:100%; border-collapse:collapse; }
th, td { padding:12px; border-bottom:1px solid #1f2937; text-align:left; vertical-align:top; }
.inline-form { display:flex; gap:8px; align-items:center; }
.admin-actions { display:grid; gap:12px; min-width:260px; }
.compact-form { gap:10px; padding:12px; border:1px solid #1f2937; border-radius:12px; background:#0b1220; }
.attachment-list { display:grid; gap:10px; margin-top:12px; }
.attachment-card { display:grid; gap:4px; padding:12px; border:1px solid #334155; border-radius:12px; color:#e2e8f0; text-decoration:none; background:#0b1220; }
.attachment-card:hover { border-color:#60a5fa; background:#0f1b33; }
.danger-zone { border-color:#7f1d1d; }
button.danger { background:#b91c1c; }
@media (max-width: 900px) { .hero, .chat-layout, .admin-grid { grid-template-columns:1fr; } .message.user, .message.assistant { margin:0; } }