:root{--ink:#172a36;--muted:#526570;--line:#d5e1e4;--green:#146455;--page:#f3f6f6}*{box-sizing:border-box}body{margin:0;background:var(--page);color:var(--ink);font:16px/1.65 system-ui,"Microsoft YaHei",sans-serif}.practice-wrap{max-width:1050px;margin:auto;padding:28px 24px 110px}h1{font-size:30px;line-height:1.3;margin:10px 0}h2{font-size:22px;margin:0 0 10px}h3{font-size:18px}.eyebrow{color:var(--green);font-weight:700;font-size:13px}.muted{color:var(--muted)}.practice-nav{display:flex;gap:20px;flex-wrap:wrap;margin-bottom:24px}a{color:var(--green)}.practice-modes{display:grid;grid-template-columns:2fr 1fr 1fr;gap:12px;margin:24px 0}.practice-modes button{display:block;text-align:left;background:white;color:var(--ink);padding:20px;border:1px solid var(--line);border-radius:12px}.practice-modes button[aria-pressed=true]{border:2px solid var(--green);background:#edf7f2}.practice-modes b{display:block;font-size:20px}.practice-modes span{display:block;font-size:14px;margin-top:8px}.practice-card{background:white;border:1px solid var(--line);border-radius:14px;padding:24px;margin:18px 0;overflow-wrap:anywhere}.practice-fields{display:grid;grid-template-columns:1fr 2fr 1fr;gap:14px;margin:18px 0}label{display:block;font-size:14px;font-weight:600}select,textarea,input{font:inherit;max-width:100%}select,textarea{display:block;width:100%;border:1px solid #94a9b1;background:white;color:var(--ink);padding:10px;border-radius:8px;margin-top:6px}textarea{min-height:150px}button,.practice-button{font:inherit;cursor:pointer;border:1px solid var(--green);background:var(--green);color:white;padding:10px 18px;border-radius:8px;min-height:44px;text-decoration:none;display:inline-block}button:disabled{opacity:.6;cursor:default}button.secondary{color:var(--green);background:white}.practice-actions{display:flex;gap:12px;flex-wrap:wrap;margin-top:18px}.question-image,.answer-image{display:block;width:100%;height:auto;max-height:800px;object-fit:contain;border:1px solid var(--line);background:white;margin:16px 0}.answer-image{max-width:600px}.badge{font-size:13px;background:#eaf3ed;color:#245441;padding:4px 10px;border-radius:16px}.practice-status{min-height:28px;color:#8a3719;white-space:pre-wrap}.practice-status.ok{color:var(--green)}.closed-card h2{font-size:20px}.closed-card .practice-actions a{flex:1 1 auto;text-align:center}.feedback{background:#edf7f2;padding:16px;border-radius:8px}.official{white-space:pre-wrap;overflow-wrap:anywhere;margin-top:14px}.split{display:grid;grid-template-columns:1fr 1fr;gap:22px}[hidden]{display:none!important}:focus-visible{outline:3px solid #b06400;outline-offset:3px}@media(max-width:650px){.practice-wrap{padding:18px 16px 100px}h1{font-size:26px}.practice-modes{grid-template-columns:1fr 1fr;gap:10px}.practice-modes button:first-child{grid-column:1/-1}.practice-modes button{padding:14px}.practice-fields,.split{grid-template-columns:1fr}.practice-card{padding:16px}.practice-actions button{flex:1}.question-image{max-height:none}}

.practice-status:empty{display:none}.badge{display:inline-block}.lost-point{border-top:1px solid var(--line);margin-top:12px;padding-top:12px}