:root{--bg: #f3f6fb;--surface: #ffffff;--text: #122035;--muted: #5a6b84;--line: #d8e1ee;--primary: #0f766e;--primary-strong: #115e59;--danger: #b42318}*{box-sizing:border-box}body{margin:0;font-family:Segoe UI,PingFang SC,sans-serif;background:radial-gradient(circle at top right,#d9f5f0,transparent 38%),var(--bg);color:var(--text)}.page{max-width:1120px;margin:0 auto;padding:24px}.topbar{display:flex;justify-content:space-between;align-items:start;gap:16px;margin-bottom:20px}.topbar h1{margin:0;font-size:30px}.topbar p{margin:6px 0 0;color:var(--muted)}.quota{padding:10px 14px;background:#e6fff8;border:1px solid #9fe8d7;border-radius:12px;font-weight:600}.layout{display:grid;grid-template-columns:340px 1fr;gap:16px}.card{background:var(--surface);border:1px solid var(--line);border-radius:14px;padding:16px;box-shadow:0 10px 24px #041f370d}.login-card{max-width:420px}h2,h3{margin-top:0}label{font-size:14px;color:var(--muted);display:block;margin:10px 0 6px}input,textarea,button{font:inherit}input,textarea{width:100%;border:1px solid var(--line);border-radius:10px;padding:10px 12px;outline:none}input:focus,textarea:focus{border-color:#8ecfbe;box-shadow:0 0 0 3px #0f766e1f}.row{display:grid;grid-template-columns:1fr 1fr;gap:8px;margin-top:10px}button{border:none;border-radius:10px;background:var(--primary);color:#fff;padding:10px 12px;cursor:pointer;transition:background .2s ease}button:hover{background:var(--primary-strong)}button:disabled{background:#9db7b3;cursor:not-allowed}button.secondary{background:#5f6f86}button.secondary:hover{background:#4f5d72}button.danger{background:var(--danger)}.status{font-size:13px;color:var(--muted);margin-top:12px}.billing-box{border:1px solid #b6d8ff;background:#f3f9ff;border-radius:10px;padding:10px;margin-bottom:10px}.billing-box p{margin:0 0 6px;font-size:14px}.chat-panel{min-height:560px;display:flex;flex-direction:column}.messages{flex:1;border:1px solid var(--line);border-radius:12px;padding:12px;overflow:auto;background:#f9fbfe}.msg{border-radius:10px;padding:10px;margin-bottom:10px}.msg .tag{display:inline-block;font-size:12px;font-weight:700;margin-bottom:4px}.msg p{margin:0;white-space:pre-wrap;line-height:1.5}.msg-user{background:#e8f2ff}.msg-assistant{background:#eefcf8}.msg-reminder{background:#fff8e6}.hint{margin:0;color:var(--muted)}.input-row{display:grid;grid-template-columns:1fr 120px;gap:8px;margin-top:10px}@media(max-width:900px){.layout{grid-template-columns:1fr}.topbar{flex-direction:column}}