:root{--ink:#172b3a;--muted:#6b7b87;--line:#dce5e8;--paper:#f6f8f7;--teal:#167c74;--gold:#d69b45}*{box-sizing:border-box}body{margin:0;background:var(--paper);color:var(--ink);font:15px/1.6 -apple-system,BlinkMacSystemFont,"PingFang SC",sans-serif}.top{height:72px;background:#fff;border-bottom:1px solid var(--line);display:flex;align-items:center;justify-content:space-between;padding:0 clamp(20px,6vw,96px)}.brand{display:flex;gap:10px;align-items:center}.mark{background:var(--teal);color:#fff;width:34px;height:34px;display:grid;place-items:center;font-weight:700;border-radius:8px}.brand b{display:block;font-size:16px}.brand small{color:var(--muted);font-size:11px}.season{color:var(--muted);font-size:12px}main{max-width:1050px;margin:auto;padding:48px 24px}.welcome{max-width:680px}.eyebrow{color:var(--teal);font-size:12px;letter-spacing:.08em;margin:0 0 6px}.welcome h1{font-size:clamp(28px,4vw,44px);line-height:1.2;margin:0 0 14px;letter-spacing:0}.intro{color:var(--muted);max-width:560px}.dashboard{display:grid;grid-template-columns:2fr 1fr;gap:16px;margin:34px 0}.score-panel,.quick-panel,.workspace{background:#fff;border:1px solid var(--line);border-radius:8px}.score-panel{padding:22px}.panel-head{display:flex;justify-content:space-between;color:var(--muted);font-size:13px}.panel-head button{border:0;background:none;color:var(--teal);cursor:pointer}.score-row{display:grid;grid-template-columns:1fr 1fr 1fr;margin-top:24px;gap:12px}.score-row small{display:block;color:var(--muted);font-size:12px}.score-row strong{font-size:28px;display:block;margin-top:3px}.subject strong{font-size:16px;margin-top:9px}.hint{border-top:1px solid var(--line);margin-top:20px;padding-top:12px;color:var(--gold);font-size:12px}.quick-panel{padding:18px;display:flex;flex-direction:column;gap:8px}.panel-label{font-size:12px;color:var(--muted);margin-bottom:4px}.quick{border:0;background:#f1f7f5;color:var(--ink);text-align:left;padding:10px 12px;border-radius:6px;cursor:pointer}.quick i{float:right;color:var(--teal);font-style:normal}.workspace{padding:24px;max-width:760px}.chat-head{display:flex;justify-content:space-between;align-items:end;border-bottom:1px solid var(--line);padding-bottom:16px}.chat-head h2{margin:0;font-size:22px}.online{font-size:12px;color:var(--muted)}.online i{display:inline-block;width:7px;height:7px;border-radius:50%;background:#51aa72;margin-right:5px}.messages{min-height:160px;padding:20px 0}.msg{max-width:90%;padding:12px 14px;border-radius:8px;margin:8px 0;white-space:pre-wrap}.assistant{background:#f1f5f3}.user{background:var(--teal);color:#fff;margin-left:auto}.composer{display:flex;gap:10px;border:1px solid var(--line);padding:8px;border-radius:8px}.composer textarea{flex:1;border:0;resize:none;outline:0;font:inherit;padding:6px}.composer button{background:var(--teal);color:#fff;border:0;border-radius:6px;padding:0 16px;cursor:pointer}.notice,footer{color:var(--muted);font-size:11px}.notice{margin-top:12px}footer{text-align:center;padding:24px}@media(max-width:700px){.season{display:none}.dashboard{grid-template-columns:1fr}.score-row{grid-template-columns:1fr 1fr}.subject{grid-column:span 2}}
dialog{border:1px solid var(--line);border-radius:8px;padding:22px;min-width:min(90vw,360px);color:var(--ink)}dialog::backdrop{background:#172b3a66}dialog label{display:block;color:var(--muted);margin:10px 0}dialog input{display:block;width:100%;padding:8px;border:1px solid var(--line);border-radius:5px;font:inherit}.dialog-actions{display:flex;justify-content:flex-end;gap:8px;margin-top:18px}