:root{--bg:#070b14;--panel:#0f172a;--text:#f8fafc;--muted:#94a3b8;--line:#22304d;--accent:#4f8cff;--user:#1d4ed8;--assistant:#172033}*{box-sizing:border-box}html,body{margin:0;min-height:100%;background:var(--bg);color:var(--text);font-family:-apple-system,BlinkMacSystemFont,"SF Pro Text","Segoe UI",sans-serif}body{padding:env(safe-area-inset-top) 0 env(safe-area-inset-bottom)}button,textarea{font:inherit}.app{min-height:100dvh;display:grid;grid-template-rows:auto 1fr auto;max-width:900px;margin:0 auto;background:linear-gradient(180deg,#0a1020,#070b14)}.topbar{display:flex;justify-content:space-between;gap:16px;align-items:center;padding:18px 16px;border-bottom:1px solid var(--line);position:sticky;top:0;background:rgba(7,11,20,.94);backdrop-filter:blur(18px);z-index:5}.topbar h1{margin:0;font-size:20px}.topbar p{margin:4px 0 0;color:var(--muted);font-size:12px}.ghost{border:1px solid var(--line);background:transparent;color:var(--text);padding:9px 12px;border-radius:12px}.messages{padding:18px 14px 150px;overflow-y:auto}.msg{display:flex;margin:10px 0}.msg.user{justify-content:flex-start}.msg.assistant{justify-content:flex-end}.bubble{max-width:86%;padding:12px 14px;border-radius:18px;white-space:pre-wrap;line-height:1.65;word-break:break-word}.user .bubble{background:var(--user);border-bottom-left-radius:6px}.assistant .bubble{background:var(--assistant);border:1px solid var(--line);border-bottom-right-radius:6px}.controls{position:sticky;bottom:0;padding:10px 12px calc(12px + env(safe-area-inset-bottom));background:linear-gradient(180deg,rgba(7,11,20,.15),rgba(7,11,20,.98) 24%);z-index:5}.composer{display:grid;grid-template-columns:1fr auto;gap:8px;align-items:end;background:var(--panel);border:1px solid var(--line);border-radius:18px;padding:7px}textarea{resize:none;max-height:140px;min-height:42px;background:transparent;color:var(--text);border:0;outline:0;padding:10px 8px}.send{height:42px;border:0;background:var(--accent);color:#fff;padding:0 17px;border-radius:12px;font-weight:700}.send:disabled{opacity:.55}.note{text-align:center;color:var(--muted);font-size:11px;margin-top:7px}.error .bubble{border-color:#7f1d1d;background:#2a1115}.typing .bubble{color:var(--muted)}