:root{--bg:#fbfaf7;--fg:#1c1b19;--muted:#6b675f;--line:#e4e0d6;--card:#fff;--accent:#0b6e8f;--ok:#17803d;--bad:#b3261e;--warn:#fff4d6;--tip:#e8f4ee}@media (prefers-color-scheme:dark){:root{--bg:#141413;--fg:#efede6;--muted:#a09b90;--line:#2e2c28;--card:#1d1c1a;--accent:#5cc0e0;--ok:#4cc27a;--bad:#ff8a80;--warn:#2d2812;--tip:#14261c}}*{box-sizing:border-box}html{scroll-behavior:smooth}body{background:var(--bg);color:var(--fg);margin:0;font:17px/1.7 ui-sans-serif,system-ui,-apple-system,Segoe UI,sans-serif}.top{border-bottom:1px solid var(--line);flex-wrap:wrap;justify-content:space-between;align-items:center;gap:12px;padding:12px 16px;display:flex}.brand{letter-spacing:.12em;color:var(--fg);font-weight:800;text-decoration:none}.brand span{letter-spacing:0;color:var(--muted);font-weight:500}.tag{letter-spacing:.18em;color:var(--muted);font-size:11px}.wrap{max-width:780px;margin:0 auto;padding:24px 16px 96px}h1{margin:.2em 0;font-size:2rem;line-height:1.2}h2{border-bottom:2px solid var(--line);margin:2.2em 0 .4em;padding-bottom:.2em;font-size:1.5rem}h3{margin:1.6em 0 .3em;font-size:1.15rem}.muted{color:var(--muted)}.subj{text-transform:uppercase;letter-spacing:.14em;color:var(--accent);font-size:12px;font-weight:700}.cards{gap:12px;padding:0;list-style:none;display:grid}.cards a{border:1px solid var(--line);background:var(--card);color:inherit;border-radius:12px;flex-direction:column;gap:4px;padding:16px;text-decoration:none;display:flex}.jump{background:var(--bg);z-index:5;flex-wrap:wrap;gap:8px;margin:12px 0 8px;padding:8px 0;display:flex;position:sticky;top:0}.jump a{border:1px solid var(--line);color:var(--fg);border-radius:999px;padding:4px 12px;font-size:14px;text-decoration:none}.notes svg{background:var(--card);border:1px solid var(--line);border-radius:10px;max-width:100%;height:auto;margin:12px auto;display:block}.notes table{border-collapse:collapse;width:100%;font-size:15px;display:block;overflow-x:auto}.notes th,.notes td{border:1px solid var(--line);text-align:left;vertical-align:top;padding:6px 10px}.notes th{background:var(--card)}.box{border-left:4px solid var(--accent);background:var(--tip);border-radius:10px;margin:16px 0;padding:12px 16px}.box.warn{background:var(--warn);border-left-color:#d19a00}.box.eg{background:var(--card);border:1px solid var(--line);border-left:4px solid var(--accent)}.box>b:first-child,.box>strong:first-child{text-transform:uppercase;letter-spacing:.1em;color:var(--muted);font-size:12px;display:block}details{margin:10px 0}summary{cursor:pointer;font-weight:600}code,.mono{font-family:ui-monospace,Menlo,monospace;font-size:.92em}.qset{margin-top:48px}.score{font-weight:700}.qset ol{counter-reset:q;padding-left:0;list-style:none}.q{counter-increment:q;border:1px solid var(--line);background:var(--card);border-radius:12px;margin:12px 0;padding:14px 16px}.qtext:before{content:counter(q) ". ";font-weight:700}.chip{border:1px solid var(--line);color:var(--muted);border-radius:999px;padding:1px 8px;font-size:11px}.opts{gap:8px;margin:10px 0;display:grid}.opt{text-align:left;border:1px solid var(--line);color:inherit;font:inherit;cursor:pointer;background:0 0;border-radius:8px;padding:10px 12px}.opt:hover:not(:disabled){border-color:var(--accent)}.opt.right{border-color:var(--ok);background:color-mix(in srgb,var(--ok) 15%,transparent)}.opt.wrong{border-color:var(--bad);background:color-mix(in srgb,var(--bad) 15%,transparent)}.ok{color:var(--ok);margin:4px 0;font-weight:700}.bad{color:var(--bad);margin:4px 0;font-weight:700}.link{color:var(--accent);cursor:pointer;font:inherit;background:0 0;border:0;padding:4px 0}.why{background:var(--tip);border-radius:8px;margin-top:8px;padding:10px 12px}.int{gap:8px;margin:10px 0;display:flex}.int input{border:1px solid var(--line);background:var(--card);color:inherit;font:inherit;border-radius:8px;width:160px;padding:8px}.int button,.unlock button{background:var(--accent);color:#fff;font:inherit;cursor:pointer;border:0;border-radius:8px;padding:8px 16px}.unlock{text-align:center;max-width:380px;margin:12vh auto;padding:0 16px}.unlock form{gap:8px;margin:16px 0;display:flex}.unlock input{border:1px solid var(--line);background:var(--card);color:inherit;font:inherit;border-radius:8px;flex:1;padding:10px}.err{color:var(--bad)}@media print{.top,.jump,.link{display:none}.q{break-inside:avoid}}