:root{--bg:#f7f8fa;--card:#ffffff;--text:#1f2328;--muted:#6b7280;--accent:#2563eb;--border:#e5e7eb}*{box-sizing:border-box}body{margin:0;background:var(--bg);color:var(--text);font-family:-apple-system,Segoe UI,Microsoft YaHei,PingFang SC,sans-serif;line-height:1.6}.container{max-width:760px;margin:0 auto;padding:32px 20px 48px}h1{font-size:24px;margin:0 0 4px}.subtitle{color:var(--muted);margin:0 0 28px;font-size:14px}.grid{display:grid;grid-gap:14px;gap:14px}.card{display:block;background:var(--card);border:1px solid var(--border);border-radius:12px;padding:16px 18px;text-decoration:none;color:inherit;transition:border-color .15s,box-shadow .15s}.card:hover{border-color:var(--accent);box-shadow:0 2px 10px rgba(37,99,235,.08)}.card .name{font-weight:600;margin-bottom:2px}.card .desc{color:var(--muted);font-size:13px}.chat{display:flex;flex-direction:column;min-height:calc(100vh - 160px)}.messages{flex:1 1;display:flex;flex-direction:column;gap:14px;padding-bottom:20px}.msg{max-width:85%;padding:10px 14px;border-radius:14px;white-space:pre-wrap;word-break:break-word}.msg p{margin:0 0 8px}.msg p:last-child{margin-bottom:0}.msg.user{align-self:flex-end;background:var(--accent);color:#fff}.msg.assistant{align-self:flex-start;background:var(--card);border:1px solid var(--border)}.tool-badge{display:inline-block;font-size:12px;color:var(--accent);background:rgba(37,99,235,.08);border:1px solid rgba(37,99,235,.2);border-radius:6px;padding:1px 8px;margin:2px 4px 2px 0}.error{color:#b91c1c;background:#fee2e2;border:1px solid #fecaca;border-radius:8px;padding:8px 12px;font-size:13px;margin-bottom:10px}.composer{display:flex;gap:10px;padding-top:12px;border-top:1px solid var(--border)}.composer textarea{flex:1 1;resize:none;border:1px solid var(--border);border-radius:10px;padding:10px 12px;font:inherit;background:var(--card)}.composer textarea:focus{outline:none;border-color:var(--accent)}.composer button{border:none;border-radius:10px;background:var(--accent);color:#fff;padding:0 22px;font:inherit;cursor:pointer}.composer button:disabled{opacity:.5;cursor:default}.back{display:inline-block;margin-bottom:16px;color:var(--muted);text-decoration:none;font-size:14px}.back:hover{color:var(--accent)}