:root{--bg: #0b0c0f;--surface: #16171c;--surface-2: #1f2128;--line: #2a2c34;--text: #f2f2f5;--muted: #8b8d98;--accent: #6c8cff}*{box-sizing:border-box}html,body{height:100%;margin:0}body{background:var(--bg);color:var(--text);font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Inter,sans-serif}.chat{max-width:720px;margin:0 auto;height:100vh;display:flex;flex-direction:column;padding:20px 16px}.chat-header{display:flex;justify-content:space-between;align-items:center;margin-bottom:16px}.chat-header h1{font-size:18px;margin:0}.ghost-btn{background:transparent;border:1px solid var(--line);color:var(--muted);border-radius:8px;padding:6px 12px;font-size:13px;cursor:pointer}.ghost-btn:hover{color:var(--text);border-color:var(--muted)}.ghost-btn:disabled{opacity:.4;cursor:not-allowed}.chat-log{flex:1;overflow-y:auto;display:flex;flex-direction:column;gap:12px;padding-bottom:12px}.empty{color:var(--muted);text-align:center;margin-top:40px;font-size:14px}.bubble{max-width:85%;padding:10px 14px;border-radius:12px;background:var(--surface);border:1px solid var(--line)}.bubble.user{align-self:flex-end;background:var(--surface-2)}.bubble.assistant{align-self:flex-start}.bubble .role{display:block;font-size:11px;text-transform:uppercase;letter-spacing:.05em;color:var(--muted);margin-bottom:4px}.bubble p{margin:0;white-space:pre-wrap;line-height:1.5;font-size:14px}.error{color:#ff8080;font-size:13px;margin:0 0 8px}.composer{display:flex;gap:8px;border-top:1px solid var(--line);padding-top:12px}.composer textarea{flex:1;resize:none;background:var(--surface);border:1px solid var(--line);color:var(--text);border-radius:10px;padding:10px 12px;font-size:16px;font-family:inherit;max-height:140px}.composer textarea:focus{outline:2px solid var(--accent);outline-offset:1px}.composer button{background:var(--accent);color:#0b0c0f;border:none;border-radius:10px;padding:0 18px;font-weight:600;cursor:pointer}.composer button:disabled{opacity:.4;cursor:not-allowed}