:root{--bg: #f5f6f8;--card: #ffffff;--border: #e4e7ec;--border-2: #d0d5dd;--text: #1a1d21;--muted: #6b7280;--faint: #9aa1ac;--accent: #2f6feb;--accent-soft: #eef4ff;--accent-line: #c5d9ff;--green: #16a34a;--green-soft: #eafaf0;--amber: #b45309;--amber-soft: #fff7e6;--red: #dc2626;--red-soft: #fdeceb;--purple: #7c3aed;--purple-soft: #f3efff;--radius: 12px;--shadow: 0 1px 2px rgba(16, 24, 40, .06), 0 1px 3px rgba(16, 24, 40, .04)}*{box-sizing:border-box;margin:0;padding:0}body{font-family:system-ui,-apple-system,Segoe UI,PingFang SC,Microsoft YaHei,sans-serif;background:var(--bg);color:var(--text);font-size:14px;line-height:1.6;-webkit-font-smoothing:antialiased}.wrap{max-width:1080px;margin:0 auto;padding:0 20px 80px}header{padding:22px 0 14px;display:flex;align-items:baseline;gap:10px;flex-wrap:wrap}header h1{font-size:19px;font-weight:650;letter-spacing:-.2px}header .en{font-size:13px;color:var(--faint);font-weight:500}.tabs{display:flex;gap:4px;background:var(--card);border:1px solid var(--border);border-radius:var(--radius);padding:4px;box-shadow:var(--shadow);position:sticky;top:0;z-index:20}.tab{flex:1;padding:9px 6px;text-align:center;border-radius:9px;cursor:pointer;font-weight:600;font-size:13.5px;color:var(--muted);border:none;background:none;transition:.15s;font-family:inherit}.tab:hover{color:var(--text);background:#f2f4f7}.tab.on{background:var(--accent);color:#fff}.tab .num{font-size:11px;opacity:.75;margin-left:4px}.panel{display:none;margin-top:18px}.panel.on{display:block}.card{background:var(--card);border:1px solid var(--border);border-radius:var(--radius);padding:18px;box-shadow:var(--shadow);margin-bottom:14px}.card-t{font-size:15px;font-weight:650;margin-bottom:2px;display:flex;align-items:center;gap:8px;flex-wrap:wrap}.card-d{font-size:12.5px;color:var(--muted);margin-bottom:14px}.grid2{display:grid;grid-template-columns:280px 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.zh{font-size:13.5px;font-weight:550;line-height:1.6}.q-item .en{font-size:12.5px;color:var(--muted);margin-top:4px;font-style:italic}.q-meta{margin-top:8px;display:flex;gap:6px;align-items:center;flex-wrap:wrap}.tag{font-size:11px;font-weight:650;padding:2px 8px;border-radius:6px;background:#f2f4f7;color:var(--muted)}.tag.b{background:var(--accent-soft);color:var(--accent)}.tag.g{background:var(--green-soft);color:var(--green)}.tag.a{background:var(--amber-soft);color:var(--amber)}.tag.p{background:var(--purple-soft);color:var(--purple)}.tag.r{background:var(--red-soft);color:var(--red)}.steps{display:flex;gap:6px;margin-bottom:16px;flex-wrap:wrap}.step{flex:1;min-width:110px;padding:8px 10px;border-radius:9px;background:#f2f4f7;font-size:11.5px;font-weight:650;color:var(--faint);text-align:center;border:1px solid transparent}.step.on{background:var(--accent-soft);color:var(--accent);border-color:var(--accent-line)}.step.done{background:var(--green-soft);color:var(--green)}.mode-card{flex:1;min-width:180px;border:1px solid var(--border);border-radius:11px;padding:14px;cursor:pointer;transition:.15s;background:#fff;text-align:left}.mode-card:hover{border-color:var(--accent-line);background:#fbfcff}.mode-card.on{border-color:var(--accent);background:var(--accent-soft);box-shadow:0 0 0 3px #eef4ff}.mode-card b{display:block;font-size:13.5px;margin-bottom:3px}.mode-card span{font-size:11.5px;color:var(--muted);line-height:1.5;display:block}.mode-card .ic{font-size:18px;margin-bottom:6px;display:block}.timer{display:flex;align-items:center;gap:16px;padding:14px 16px;border-radius:11px;background:#fbfcfe;border:1px solid var(--border);margin-bottom:12px;flex-wrap:wrap}.clock{font-size:34px;font-weight:700;font-variant-numeric:tabular-nums;letter-spacing:-1px;font-family:ui-monospace,SF 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button{border:none;border-radius:0;padding:6px 13px;font-size:12px;background:#fff;color:var(--muted)}.seg button.on{background:var(--purple);color:#fff}.rv-item{border:1px solid var(--border);border-radius:11px;margin-bottom:10px;background:#fff;overflow:hidden}.rv-head{padding:13px 15px;cursor:pointer;display:flex;align-items:center;gap:10px;flex-wrap:wrap}.rv-head:hover{background:#fafbfc}.rv-head .t{font-size:13.5px;font-weight:600;flex:1;min-width:200px}.rv-body{padding:0 15px 15px;border-top:1px solid var(--border);display:none}.rv-body.on{display:block}.tip{background:var(--amber-soft);border:1px solid #ffe2ab;border-radius:9px;padding:10px 12px;font-size:12.5px;line-height:1.7;margin:12px 0}.tip .lbl{font-size:11px;font-weight:700;color:var(--amber);margin-bottom:4px;letter-spacing:.3px}.stat{background:#f7f8fa;border:1px solid var(--border);border-radius:10px;padding:12px 14px;text-align:center}.stat .n{font-size:22px;font-weight:700;line-height:1.2}.stat .l{font-size:11.5px;color:var(--muted);margin-top:2px}details{border:1px solid var(--border);border-radius:10px;margin-bottom:8px;background:#fff;overflow:hidden}details summary{padding:11px 14px;cursor:pointer;font-weight:600;font-size:13.5px;list-style:none;display:flex;align-items:center;gap:8px}details summary::-webkit-details-marker{display:none}details summary:before{content:"▸";color:var(--faint);font-size:11px;transition:.2s}details[open] summary:before{transform:rotate(90deg)}details .dc{padding:0 14px 14px;font-size:13px;line-height:1.75;color:#374151}details .dc code{background:#f2f4f7;padding:1px 5px;border-radius:4px;font-size:12px}details .dc ol,details .dc ul{padding-left:20px;margin:6px 0}details .dc li{margin-bottom:4px}.empty{text-align:center;padding:34px 16px;color:var(--faint);font-size:13px}.empty .ic{font-size:30px;display:block;margin-bottom:8px;opacity:.5}.divider{height:1px;background:var(--border);margin:16px 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.num{opacity:.85}.clock{font-size:29px}button,.btn{min-height:42px}.btn-sm{min-height:36px}input,select,textarea{font-size:16px}textarea{min-height:120px}.card{padding:15px 14px}.rv-head{padding:14px 13px}.steps{flex-wrap:nowrap;overflow-x:auto;padding-bottom:4px;-webkit-overflow-scrolling:touch}.step{min-width:118px;flex:none;text-align:left}}