.st-head{max-width:860px;padding:18px 0 6px}.st-head h1{letter-spacing:-.025em;margin-top:14px;font-size:clamp(28px,4vw,42px);font-weight:800}.st-lead{color:var(--ink-2);margin-top:12px;font-size:17px}.st-lead a{color:var(--brand-600)}.st-stats{flex-wrap:wrap;gap:8px;margin:18px 0 0;padding:0;list-style:none;display:flex}.st-stats li{border:1px solid var(--line);background:var(--surface);color:var(--ink-2);border-radius:999px;padding:6px 12px;font-size:14px}.st-stats b{color:var(--ink)}.st-related{flex-wrap:wrap;gap:6px 16px;margin-top:16px;font-size:14.5px;display:flex}.st-related a{color:var(--brand-600);font-weight:600;text-decoration:none}.st-related a:hover{text-decoration:underline}.st-bar{top:var(--header-h);z-index:20;margin:24px calc(var(--gutter) * -1) 0;padding:12px var(--gutter);-webkit-backdrop-filter:blur(10px);border-bottom:1px solid var(--line);background:#f5f6f8f0;flex-wrap:wrap;align-items:center;gap:10px 14px;display:flex;position:sticky}.st-search{border:1px solid var(--line);background:var(--surface);border-radius:12px;flex:300px;align-items:center;gap:8px;height:44px;padding:0 14px;display:flex}.st-search:focus-within{border-color:var(--brand);box-shadow:0 0 0 3px #c8102e1f}.st-search svg{width:18px;height:18px;color:var(--muted);flex:none}.st-search input{font:inherit;width:100%;min-width:0;color:var(--ink);background:0 0;border:none;outline:none;font-size:15px}.st-chips{flex-wrap:wrap;gap:6px;display:flex}.st-page .chip,.study-page .chip{border:1px solid var(--line);background:var(--surface);color:var(--ink-2);border-radius:999px;padding:7px 14px;font-size:14px;font-weight:600}.study-page .chip.on{background:var(--ink);border-color:var(--ink);color:#fff}.st-toggle{color:var(--ink-2);cursor:pointer;user-select:none;align-items:center;gap:10px;font-size:14px;font-weight:600;display:inline-flex}.st-toggle input{opacity:0;pointer-events:none;position:absolute}.st-toggle .sw{background:#d5d9df;border-radius:99px;flex:none;width:38px;height:22px;transition:background .15s;position:relative}.st-toggle .sw:after{content:"";background:#fff;border-radius:50%;width:16px;height:16px;transition:transform .15s;position:absolute;top:3px;left:3px;box-shadow:0 1px 2px #0003}.st-toggle input:checked+.sw{background:var(--brand)}.st-toggle input:checked+.sw:after{transform:translate(16px)}.st-toggle input:focus-visible+.sw{outline:3px solid color-mix(in srgb, var(--brand) 45%, transparent);outline-offset:2px}.st-count{color:var(--muted);margin-top:14px;font-size:14px}.st-grid{grid-template-columns:minmax(0,1fr) 280px;align-items:start;gap:32px;display:grid}.st-side{top:calc(var(--header-h) + 84px);gap:14px;margin-top:12px;display:grid;position:sticky}.st-side-links{gap:8px;padding:18px;font-size:14.5px;display:grid}.st-side-links b{text-transform:uppercase;letter-spacing:.06em;color:var(--muted);font-size:13px}.st-side-links a{color:var(--ink-2);text-decoration:none}.st-side-links a:hover{color:var(--brand)}.st-list{gap:14px;margin:12px 0 0;padding:0;list-style:none;display:grid}.sq{scroll-margin-top:calc(var(--header-h) + 90px);padding:22px 24px}.sq-head{flex-wrap:wrap;justify-content:space-between;align-items:center;gap:10px;margin-bottom:10px;display:flex}.sq-num{color:var(--brand);text-transform:uppercase;letter-spacing:.02em;font-size:14px;font-weight:800}.sq-tags{flex-wrap:wrap;gap:6px;display:flex}.study-page .tag{border:1px solid var(--line);color:var(--muted);background:#fcfcfd;border-radius:999px;padding:3px 9px;font-size:12px;font-weight:600}.study-page .tag-critical{color:var(--brand);background:var(--brand-50);border-color:var(--brand-100)}.sq-text{letter-spacing:-.005em;font-size:17.5px;font-weight:600;line-height:1.5}.sq-img{border:1px solid var(--line-2);background:#fafafb;border-radius:12px;justify-content:center;margin:14px 0 0;padding:10px;display:flex}.sq-img img{object-fit:contain;border-radius:6px;width:auto;max-height:240px}.sq-opts{gap:8px;margin:14px 0 0;padding:0;list-style:none;display:grid}.sq-opt{border:1.5px solid var(--line);border-radius:12px;font-size:15.5px;line-height:1.5}.sq-pick{all:unset;box-sizing:border-box;width:100%;cursor:inherit;color:inherit;border-radius:11px;align-items:flex-start;gap:12px;padding:10px 14px;display:flex}.sq-pick:focus-visible{outline:3px solid color-mix(in srgb, var(--brand) 45%, transparent);outline-offset:2px}.sq-result:empty{display:none}.sq-result{color:var(--ink-2);margin-top:10px;font-size:14.5px;font-weight:600}.quiz-mode .sq:not(.revealed) .ok-sr{display:none}.sq-opt .k{width:24px;height:24px;color:var(--ink-2);border:1.5px solid #cfd3da;border-radius:50%;flex:none;place-items:center;font-size:12px;font-weight:700;display:grid}.sq-opt.ok{background:var(--ok-50);border-color:#8fd1a7}.sq-opt.ok .k{background:var(--ok);border-color:var(--ok);color:#fff}.quiz-mode .sq:not(.revealed) .sq-opt.ok{border-color:var(--line);background:var(--surface)}.quiz-mode .sq:not(.revealed) .sq-opt.ok .k{color:var(--ink-2);background:0 0;border-color:#cfd3da}.quiz-mode .sq:not(.revealed) .sq-opt{cursor:pointer}.quiz-mode .sq:not(.revealed) .sq-opt:hover{background:#fafbfc;border-color:#c3c8d0}.quiz-mode .sq:not(.revealed) .sq-explain{display:none}.quiz-mode .sq.revealed .sq-opt.picked:not(.ok){background:var(--bad-50);border-color:#f3a39b}.quiz-mode .sq.revealed .sq-opt.picked:not(.ok) .k{background:var(--bad);border-color:var(--bad);color:#fff}.sq-explain{margin-top:12px;font-size:15px}.sq-explain summary{cursor:pointer;color:var(--ink-2);font-size:14px;font-weight:600}.sq-explain p{border-left:3px solid var(--ink-2);white-space:pre-line;color:var(--ink-2);background:#f7f8fa;border-radius:10px;margin-top:8px;padding:12px 14px}.st-empty{color:var(--muted);text-align:center;padding:40px 0}.st-cta{flex-wrap:wrap;justify-content:space-between;align-items:center;gap:20px;max-width:860px;margin-top:40px;padding:26px;display:flex}.st-cta h2{font-size:21px;font-weight:800}.st-cta p{color:var(--ink-2);margin-top:4px}.st-cta-btns{flex-wrap:wrap;gap:10px;display:flex}@media (width<=1000px){.st-grid{grid-template-columns:1fr}.st-side{display:none}}@media (width<=640px){.st-bar{position:static}.sq{padding:16px}.sq-text{font-size:16.5px}.st-cta-btns .btn{flex:100%}}