:root{--bg: #0f1115;--panel: #171a21;--panel2: #1e222b;--border: #2a2f3a;--text: #e6e8ec;--muted: #8b93a1;--accent: #4f8cff;--accent2: #6ee7b7;--error: #ff6b6b}*{box-sizing:border-box}html,body,#root{height:100%;margin:0}body{background:var(--bg);color:var(--text);font:15px/1.5 -apple-system,BlinkMacSystemFont,Segoe UI,Roboto,sans-serif}.center{height:100%;display:grid;place-items:center;padding:24px}.muted{color:var(--muted)}.error{color:var(--error)}.error.banner{padding:8px 16px;background:#ff6b6b1a;border-top:1px solid var(--border);font-size:13px}.card{background:var(--panel);border:1px solid var(--border);border-radius:14px;padding:28px}.login{width:340px;display:flex;flex-direction:column;gap:14px}.login h1{margin:0;font-size:22px}.login p{margin:-6px 0 6px;font-size:13px}.login label{display:flex;flex-direction:column;gap:6px;font-size:13px;color:var(--muted)}input,textarea,select{background:var(--panel2);border:1px solid var(--border);color:var(--text);border-radius:8px;padding:10px 12px;font:inherit;outline:none}input:focus,textarea:focus{border-color:var(--accent)}button{background:var(--accent);color:#fff;border:none;border-radius:8px;padding:10px 16px;font:inherit;font-weight:600;cursor:pointer}button:disabled{opacity:.5;cursor:default}button.ghost{background:transparent;border:1px solid var(--border);color:var(--muted);font-weight:500}.app{height:100%;max-width:860px;margin:0 auto;display:flex;flex-direction:column}header{display:flex;align-items:center;justify-content:space-between;padding:14px 16px;border-bottom:1px solid var(--border)}.brand{font-weight:700}.controls{display:flex;gap:10px;align-items:center}.messages{flex:1;overflow-y:auto;padding:20px 16px;display:flex;flex-direction:column;gap:14px}.empty{margin:auto;text-align:center;max-width:420px}.msg{display:flex;flex-direction:column;gap:4px;max-width:82%}.msg.user{align-self:flex-end;align-items:flex-end}.msg.assistant{align-self:flex-start}.bubble{padding:11px 14px;border-radius:12px;white-space:pre-wrap;word-wrap:break-word}.msg.user .bubble{background:var(--accent);color:#fff;border-bottom-right-radius:3px}.msg.assistant .bubble{background:var(--panel2);border:1px solid var(--border);border-bottom-left-radius:3px}.bubble.typing{color:var(--muted);letter-spacing:2px}.metrics{font-size:11px;color:var(--muted)}.composer{display:flex;gap:10px;padding:14px 16px;border-top:1px solid var(--border)}.composer textarea{flex:1;resize:none}