*{box-sizing:border-box} :root{--bg:#f7f7f8;--surface:#fff;--ink:#191a1d;--muted:#70737b;--line:#e5e6ea;--blue:#2458a6;--blue-soft:#edf4ff;--purple:#7351a6;--purple-soft:#f4effb;--green:#31745b;--yellow:#a97714;--red:#a83d48;--radius:18px}body{margin:0;background:var(--bg);color:var(--ink);font:15px/1.6 -apple-system,BlinkMacSystemFont,"Segoe UI","Microsoft YaHei",sans-serif}button,input,textarea,select{font:inherit}button{cursor:pointer;border:0;border-radius:11px;padding:10px 15px;transition:background .16s,border-color .16s}button:focus-visible,input:focus-visible,select:focus-visible{outline:3px solid #8db5f4;outline-offset:2px}button:disabled{opacity:.4;cursor:not-allowed}.topbar{height:76px;display:flex;align-items:center;justify-content:space-between;padding:0 max(22px,calc((100vw - 1160px)/2));border-bottom:1px solid 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#0002}dialog::backdrop{background:#15151566}.dialog-head{display:flex;justify-content:space-between;align-items:center}.dialog-head h2{margin:0;font-size:22px}.dialog-head button{padding:5px 8px}dialog p{color:#555;font-size:14px}.toast{position:fixed;bottom:22px;left:50%;transform:translateX(-50%);background:#222;color:#fff;border-radius:10px;padding:10px 16px;opacity:0;pointer-events:none;transition:opacity .2s;z-index:10;max-width:calc(100vw - 28px);text-align:center}.toast.show{opacity:1}.hidden{display:none!important}@media(max-width:800px){.topbar{padding:0 15px}.storage-status{display:none}.shell{padding:24px 14px 50px}.home-actions{grid-template-columns:1fr}.home-action{min-height:90px}.stats{grid-template-columns:repeat(2,1fr)}.lower-grid,.study-layout,.management-grid,.backup-grid{grid-template-columns:1fr}.filter-bar{grid-template-columns:1fr 1fr}.session-side{order:-1}.session-side h3{margin-bottom:8px}.mini-row{display:inline-flex;width:32%;border:0;padding:6px 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.badge{display:inline-block;padding:1px 9px;border-radius:99px;background:var(--blue-soft);color:var(--blue);font-size:12px;margin-left:6px}.badge.warn{background:#fff6e0;color:var(--yellow)}
.more-row{text-align:center;padding:12px}.detail-table{width:100%;border-collapse:collapse;font-size:13px}.detail-table td,.detail-table th{border-bottom:1px solid var(--line);padding:6px;text-align:left}
dialog{max-width:min(720px,92vw);max-height:86vh;overflow:auto}
.option:disabled{opacity:1;cursor:default}.option.correct{border-color:var(--green);background:#e6f4ec;color:#1d5a43}.option.wrong{border-color:var(--red);background:#fbe9eb;color:#8a2f39}.option.selected:not(.correct):not(.wrong){border-color:var(--blue)}