:root{color-scheme:light;--ink:#263b35;--green:#176b56;--line:#e4e8e2;--muted:#65736b;--paper:#f5f6f3}*{box-sizing:border-box}body{margin:0;background:var(--paper);color:var(--ink);font:15px/1.7 Arial,'PingFang SC','Microsoft YaHei',sans-serif}button,input,select{font:inherit}button,a,input,select{-webkit-tap-highlight-color:transparent}button,select{border:1px solid #cdd8cf;border-radius:10px;background:white;color:var(--ink);padding:10px 18px}button{cursor:pointer;font-weight:600;transition:background .15s}button:hover:not(:disabled){background:#e8f1e9}button:disabled{cursor:default;opacity:.45}button.primary{background:var(--green);color:white;border-color:var(--green)}button.primary:hover:not(:disabled){background:#125741}button.small{font-size:13px;padding:8px 13px}a{color:var(--green);text-decoration:none}a:hover{text-decoration:underline}:focus-visible{outline:3px solid #9cc4ad;outline-offset:3px}[hidden]{display:none!important}header{background:white;border-bottom:1px solid var(--line)}.header-inner{max-width:1200px;margin:auto;padding:22px 28px;display:flex;justify-content:space-between;align-items:center;gap:15px}.brand{font-size:24px;font-weight:750;letter-spacing:4px}.brand span{font-size:13px;font-weight:400;letter-spacing:0;color:var(--muted);margin-left:20px}.header-actions{display:flex;align-items:center;gap:20px;font-size:13px}.badge{display:inline-block;background:#e8efe8;color:var(--green);border-radius:7px;padding:3px 10px;font-size:12px}.badge.offline{background:#f7eacd;color:#79551f}main{max-width:1200px;margin:0 auto;padding:32px 28px}.hero{border:1px solid #dce6d9;border-radius:24px;padding:38px 42px;background-color:#edf3ec;background-image:linear-gradient(#176b5608 1px,transparent 1px),linear-gradient(90deg,#176b5608 1px,transparent 1px);background-size:32px 32px}.eyebrow{color:var(--green);font-size:11px;letter-spacing:3px;font-weight:700;margin:0 0 16px}h1{font-size:40px;line-height:1.4;letter-spacing:-1px;margin:0 0 18px}h1 em{font-style:normal;color:var(--green)}.hero>p:not(.eyebrow){color:var(--muted);max-width:780px}.actions{display:flex;gap:10px;flex-wrap:wrap;margin-top:24px}.hint{font-size:12px;color:var(--muted);line-height:1.9}.hero .hint{margin-top:16px;margin-bottom:0}.notice{margin-top:20px;padding:14px 18px;border-radius:12px;background:#e5f0e9;border:1px solid #caddcf;font-size:14px;overflow-wrap:anywhere}.notice.error{background:#fbece8;border-color:#ebc4bb;color:#9b392d}.local-info{margin-top:22px;background:white;border:1px solid var(--line);border-radius:16px;padding:20px 24px;display:flex;justify-content:space-between;align-items:center;gap:20px}.local-info strong{font-size:15px}.local-info p{margin:4px 0 0;font-size:12px;color:var(--muted)}.local-info #cache-status{color:var(--green)}.privacy{font-size:12px;color:var(--muted);margin:14px 2px 30px;line-height:1.9}.empty{text-align:center;padding:55px 20px;border:1px dashed #cbd9cd;border-radius:18px}.empty>span{font-size:36px;color:var(--green)}.empty h2{font-size:21px;margin:12px 0}.empty p{color:var(--muted);font-size:14px}.workspace-top{display:flex;align-items:end;justify-content:space-between;gap:20px;margin-bottom:20px}.workspace-top label:not(.check-label){display:block;font-size:12px;color:var(--muted);margin-bottom:6px}select{min-width:260px;font-weight:600}.filters{display:flex;align-items:center;gap:18px;flex-wrap:wrap}.check-label{font-size:13px;display:flex;align-items:center;gap:7px}input[type=checkbox]{accent-color:var(--green);width:16px;height:16px}.study-grid{display:grid;grid-template-columns:minmax(0,1fr) 260px;gap:24px;align-items:start}.question-card,aside{background:white;border:1px solid var(--line);border-radius:18px;padding:28px}.question-top{display:flex;justify-content:space-between;gap:12px;font-size:13px;color:var(--muted)}.question-card h2{font-size:21px;line-height:1.9;white-space:pre-wrap;overflow-wrap:anywhere;font-weight:650;margin:24px 0}.options{display:grid;gap:12px}.option{display:flex;align-items:baseline;gap:14px;text-align:left;font-weight:400;padding:14px 17px;line-height:1.8;white-space:pre-wrap;overflow-wrap:anywhere}.option>span:first-child{display:grid;place-items:center;min-width:27px;height:27px;border:1px solid #d6e0d8;border-radius:7px;font-size:12px}.option.selected{border-color:var(--green);background:#eaf4ed}.option.correct{border-color:#6caa83;background:#eef7ef}.option.incorrect{border-color:#d6a467;background:#fff4e3}.reference{padding:18px 20px;background:#eef4ed;border-radius:12px;border:1px solid #d6e3d5;margin-top:22px;white-space:pre-wrap;overflow-wrap:anywhere;font-size:14px;line-height:1.9}.reference.wrong{background:#fff4e3;border-color:#ead5ad}.navigation{display:flex;justify-content:space-between;gap:10px;align-items:center;margin-top:18px}.navigation p{font-size:11px;color:var(--muted);text-align:center}aside{position:sticky;top:20px;padding:22px}aside h2{font-size:16px;margin:0 0 10px}aside h3{font-size:13px;margin:22px 0 12px}aside>p{font-size:12px;color:var(--muted)}progress{width:100%;height:7px;accent-color:var(--green)}.question-grid{display:grid;grid-template-columns:repeat(5,1fr);gap:7px;max-height:300px;overflow:auto;padding:3px}.question-grid button{font-size:11px;font-weight:400;padding:5px 0;border-color:transparent;background:#f0f3ee}.question-grid button.done{background:#dfeddf;color:#287451}.question-grid button.wrong{background:#f9e7cb;color:#8a6228}.question-grid button.current{background:var(--green);color:white}footer{max-width:1200px;margin:0 auto;padding:20px 28px 36px;display:flex;justify-content:space-between;gap:15px;color:var(--muted);font-size:11px}footer span{max-width:600px}noscript{display:block;padding:30px;text-align:center}@media(max-width:760px){main{padding:20px 16px}.header-inner{padding:18px 16px}.brand{font-size:21px}.brand span{margin-left:10px}.header-actions{gap:8px}.header-actions a{font-size:11px}.hero{padding:27px 23px}h1{font-size:31px}.actions button{flex:1;font-size:13px;padding:10px}.study-grid{grid-template-columns:1fr}aside{position:static}.question-card{padding:22px 19px}.question-card h2{font-size:18px}.local-info{align-items:start;flex-direction:column;padding:18px}.workspace-top{align-items:stretch;flex-direction:column;gap:14px}select{width:100%;min-width:0}.filters{justify-content:space-between}.navigation button{font-size:13px;padding:10px 14px}.question-grid{grid-template-columns:repeat(8,1fr);max-height:170px}footer{padding:12px 18px 30px;flex-direction:column}.option{font-size:14px}.privacy{margin-bottom:22px}}