:root{--bg: #f5f7fa;--card: #ffffff;--ink: #1f2937;--muted: #6b7280;--primary: #1f5fbf;--primary-ink: #ffffff;--line: #e5e7eb;--accent: #c0392b;--ok: #1a7f4b}*{box-sizing:border-box}body{margin:0;background:var(--bg);color:var(--ink);font-family:PingFang HK,Microsoft JhengHei,Noto Sans HK,Segoe UI,sans-serif;-webkit-font-smoothing:antialiased}.container{max-width:880px;margin:0 auto;padding:0 16px 40px}header.topbar{background:linear-gradient(135deg,#1f5fbf,#2e86c1);color:#fff;padding:20px 16px 18px}.topbar-inner{max-width:880px;margin:0 auto;display:flex;align-items:center;gap:12px}.topbar h1{font-size:20px;margin:0;font-weight:700}.topbar .sub{font-size:12.5px;opacity:.85;margin-top:3px}.topbar .spacer{flex:1}button.gear{background:#ffffff29;color:#fff;border:1px solid rgba(255,255,255,.45);border-radius:8px;padding:7px 14px;font-size:13px;cursor:pointer}button.gear:hover{background:#ffffff47}nav.tabs{display:flex;gap:8px;margin:16px 0;flex-wrap:wrap}nav.tabs button{border:1px solid var(--line);background:var(--card);color:var(--ink);padding:10px 18px;border-radius:10px;font-size:15px;cursor:pointer}nav.tabs button.active{background:var(--primary);border-color:var(--primary);color:var(--primary-ink);font-weight:600}.card{background:var(--card);border:1px solid var(--line);border-radius:14px;padding:18px;box-shadow:0 1px 3px #0000000d}.card h2{margin:0 0 6px;font-size:17px}.card .hint{color:var(--muted);font-size:13px;margin:0 0 14px}textarea,input[type=text],select{width:100%;border:1px solid var(--line);border-radius:9px;padding:10px 12px;font-size:15px;font-family:inherit;background:#fbfcfe}textarea:focus,input:focus,select:focus{outline:2px solid #bcd3f5;border-color:var(--primary)}textarea{min-height:84px;resize:vertical}label.field{display:block;font-size:13px;color:var(--muted);margin:12px 0 4px}.output{margin-top:14px;padding:12px 14px;border-radius:9px;background:#f2f6fc;border:1px solid #dbe7f7;font-size:16px;line-height:1.9;word-break:break-word;white-space:pre-wrap}.output .tag{display:inline-block;font-size:12px;color:var(--primary);background:#e3edfb;border-radius:6px;padding:1px 8px;margin-right:8px;vertical-align:2px}.output.jp{font-size:14.5px;background:#f7f9f4;border-color:#e2ead9}.output.jp .py{color:var(--ok);font-weight:600}.coverage{margin-top:8px;font-size:12.5px;color:var(--muted)}.coverage b{color:var(--ok)}.row{display:flex;gap:10px;align-items:center;flex-wrap:wrap}.row>*{flex:1;min-width:140px}button.primary{background:var(--primary);border:none;color:var(--primary-ink);border-radius:9px;padding:10px 20px;font-size:15px;font-weight:600;cursor:pointer}button.primary:disabled{opacity:.55;cursor:default}button.ghost{background:transparent;border:1px solid var(--line);color:var(--ink);border-radius:8px;padding:7px 14px;font-size:14px;cursor:pointer}.chat-box{display:flex;flex-direction:column;gap:10px;margin-top:14px}.msg{max-width:86%;padding:10px 13px;border-radius:12px;font-size:15px;line-height:1.75;word-break:break-word;white-space:pre-wrap}.msg.user{align-self:flex-end;background:var(--primary);color:#fff;border-bottom-right-radius:4px}.msg.ai{align-self:flex-start;background:#f1f5fb;border:1px solid #e0e8f3;border-bottom-left-radius:4px}.msg .notes{margin-top:8px;padding-top:8px;border-top:1px dashed #cdd9ea;font-size:13px;color:#4b5563}.msg .notes li{margin:3px 0}.msg .meta{margin-top:6px;font-size:11.5px;color:var(--muted);display:flex;gap:8px;align-items:center}.msg .speak{background:none;border:none;cursor:pointer;font-size:15px;padding:0 2px}.banner{margin-top:12px;font-size:13px;border-radius:9px;padding:9px 12px}.banner.demo{background:#fff7e6;border:1px solid #f2dfb6;color:#8a6116}.banner.error{background:#fdeceb;border:1px solid #f2c4c0;color:var(--accent)}.overlay{position:fixed;top:0;right:0;bottom:0;left:0;background:#0f172a73;display:flex;align-items:center;justify-content:center;padding:16px;z-index:50}.dialog{background:var(--card);border-radius:14px;padding:20px;width:100%;max-width:460px;max-height:88vh;overflow-y:auto}.dialog h3{margin:0 0 4px;font-size:17px}.dialog .small{font-size:12.5px;color:var(--muted);line-height:1.6}.dialog .actions{display:flex;justify-content:flex-end;gap:10px;margin-top:18px}footer{text-align:center;color:var(--muted);font-size:12px;margin-top:26px;line-height:1.8}.loading{padding:40px 0;text-align:center;color:var(--muted);font-size:14px}