:root{--bg:#f2f3f7;--panel:#fff;--ink:#1c1e26;--ink-2:#5c6270;--ink-3:#9aa0ad;--line:#e6e8ee;--brand:#4056e0;--brand-2:#7c5cff;--brand-soft:#eceffd;--green:#148a5c;--green-soft:#e3f5ec;--red:#d23f3f;--red-soft:#fdecec;--amber:#b97a12;--amber-soft:#fdf3e0;--radius:14px;--shadow:0 1px 2px #1c1e260a, 0 4px 16px #1c1e260d;--shadow-hover:0 2px 4px #1c1e260f, 0 10px 28px #1c1e261a;--sidebar-w:216px;font-family:-apple-system,BlinkMacSystemFont,PingFang SC,Microsoft YaHei,Segoe UI,sans-serif}*{box-sizing:border-box}html,body{margin:0;padding:0}body{background:var(--bg);color:var(--ink);font-size:14px;line-height:1.6}a{color:var(--brand);text-decoration:none}h1,h2,h3{margin:0 0 .5em;font-weight:650}h1{font-size:20px}h2{font-size:16px}h3{font-size:14px}.layout{min-height:100vh;display:flex}.sidebar{width:var(--sidebar-w);color:#c9cdd8;background:#191c26;flex-direction:column;flex-shrink:0;height:100vh;display:flex;position:sticky;top:0;overflow-y:auto}.sidebar 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4px;font-size:13.5px;display:flex}.list-row:last-child{border-bottom:none}.list-row:hover{background:#fafbfd}.list-row .grow{text-overflow:ellipsis;white-space:nowrap;flex:1;min-width:0;overflow:hidden}@media (width<=720px){.page-head h1{font-size:18px}.btn{padding:8px 14px}.quiz-opt{padding:11px 12px}.countdown .days{font-size:32px}}