/* Full polished UI */
*{box-sizing:border-box}
:root{
  --bg:#0a0c10;--bg2:#0b1117;--panel:#0e141b;--panel-2:#111a24;--text:#e8ecf1;--muted:#9aa5b1;
  --border:#1e2732;--accent:#5b9cff;--accent-2:#8a5bff;--glow:rgba(91,156,255,.25);
}
html,body{height:100%}
body{margin:0;background:
    radial-gradient(1200px 600px at 10% -10%, rgba(138,91,255,.10), transparent 60%),
    radial-gradient(800px 500px at 100% 0%, rgba(91,156,255,.08), transparent 50%),
    linear-gradient(180deg, var(--bg), var(--bg2) 60%);
  color:var(--text); font:16px/1.55 ui-sans-serif, system-ui, Segoe UI, Roboto, Arial, sans-serif;}
.app{min-height:100vh;display:grid;grid-template-rows:auto auto 1fr auto;max-width:920px;margin:0 auto;padding:14px;gap:12px}
.topbar{display:flex;align-items:center;justify-content:space-between;background:var(--panel);border:1px solid var(--border);border-radius:18px;padding:12px 14px;position:sticky;top:12px;z-index:10}
.brand{display:flex;gap:10px;align-items:center;font-weight:800;letter-spacing:.2px}
.controls{display:flex;gap:10px;align-items:center}
.muted{color:var(--muted)}
.pill{background:transparent;border:1px solid var(--border);padding:8px 10px;border-radius:10px;color:var(--text);cursor:pointer}
.suggestions{display:flex;flex-wrap:wrap;gap:8px;background:var(--panel);border:1px solid var(--border);border-radius:16px;padding:10px;align-items:center}
.suggestions .pill{padding:8px 12px;border-radius:999px;background:var(--panel-2);border:1px solid var(--border);color:var(--text);cursor:pointer;font-size:14px}
.chat{background:var(--panel);border:1px solid var(--border);border-radius:18px;padding:14px 12px;overflow:auto;scroll-behavior:smooth}
.msg{display:grid;grid-template-columns:44px 1fr;gap:12px;margin:12px 0;animation:fade .25s ease}
.avatar{width:44px;height:44px;border-radius:14px;display:grid;place-items:center;background:var(--panel-2);border:1px solid var(--border);font-size:18px}
.meta{font-size:12px;color:var(--muted);margin-bottom:6px}
.bubble{background:linear-gradient(180deg, color-mix(in srgb, var(--panel-2) 96%, #000 4%), color-mix(in srgb, var(--panel-2) 85%, #000 15%));border:1px solid var(--border);border-radius:16px;padding:12px 14px;white-space:pre-wrap;box-shadow: 0 6px 20px -12px var(--glow);}
.role-user .bubble{background:transparent;border-color:var(--border);box-shadow:none}
.composer{display:grid;grid-template-columns:1fr auto;gap:10px;align-items:end;background:var(--panel);border:1px solid var(--border);border-radius:18px;padding:12px;position:sticky;bottom:10px;}
#input{resize:none;max-height:180px;min-height:48px;border-radius:14px;border:1px solid var(--border);background:var(--panel-2);color:var(--text);padding:12px 14px;outline:none}
.send-btn{background:linear-gradient(45deg,var(--accent),var(--accent-2));border:none;color:#fff;padding:12px 18px;border-radius:14px;cursor:pointer;font-weight:800}
@keyframes fade{from{opacity:0;transform:translateY(4px)}to{opacity:1;transform:none}}
@media (max-width:640px){.app{padding:10px}.msg{grid-template-columns:38px 1fr}.avatar{width:38px;height:38px;border-radius:12px}}