@font-face{font-family:geist mono;font-style:normal;font-weight:100 900;font-display:swap;src:url(../fonts/geist-mono.woff2)format("woff2")}@font-face{font-family:geist;font-style:normal;font-weight:100 900;font-display:swap;src:url(../fonts/geist.woff2)format("woff2")}:root{--canvas:#ffffff;--ink:#000000;--ink-2:rgb(0 0 0 / 80%);--border:rgb(0 0 0 / 20%);--border-strong:rgb(0 0 0 / 38%);--hover:rgb(0 0 0 / 6%);--ink-link:#0000ff;--accent:#0000ff;--radius:3px;--header-h:66px;--measure:68ch;--font-body:"Geist", system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;--font-heading:var(--font-body);--font-mono:"Geist Mono", ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", "Courier New", monospace;--font:var(--font-body);--ease-out:cubic-bezier(0.23, 1, 0.32, 1);--ease-in-out:cubic-bezier(0.77, 0, 0.175, 1);--ease-drawer:cubic-bezier(0.32, 0.72, 0, 1);--ease-drawer-close:cubic-bezier(0.23, 1, 0.32, 1);--duration-fast:150ms;--duration-drawer:320ms;--duration-drawer-close:260ms;--duration-fade:200ms;--scale-press-btn:0.97;--scale-press-card:0.985}*{box-sizing:border-box}[hidden]{display:none!important}html{-webkit-text-size-adjust:100%;scroll-padding-top:calc(var(--header-h) + 16px)}body{margin:0;background:var(--canvas);color:var(--ink);font-family:var(--font);font-size:16px;line-height:1.6}h1,h2,h3,h4,h5,h6{font-family:var(--font-heading);line-height:1.2;letter-spacing:-.01em;font-weight:700;text-wrap:balance}h1{font-family:var(--font-mono);font-size:2rem;margin:0 0 8px}h2{font-size:1.375rem;margin:40px 0 8px}h3{font-size:1.125rem;margin:24px 0 8px}p{margin:0 0 16px}a{color:var(--ink-link);text-underline-offset:2px}a:hover{text-decoration-thickness:2px}:focus-visible{outline:2px solid var(--ink);outline-offset:2px}.skip-link{position:fixed;inset-inline-start:0;top:0;z-index:1080;padding:8px 16px;background:var(--ink);color:var(--canvas);text-decoration:none}.skip-link:not(:focus):not(:focus-visible){position:absolute;width:1px;height:1px;overflow:hidden;clip:rect(0 0 0 0);white-space:nowrap}.skip-link:focus-visible{outline-color:var(--canvas)}.sr-only{position:absolute;width:1px;height:1px;overflow:hidden;clip:rect(0 0 0 0);white-space:nowrap}.wrap{max-width:1120px;margin-inline:auto;padding-inline:24px}.prose{max-width:var(--measure)}.prose ul,.prose ol{padding-left:20px;margin:0 0 20px}.prose li{margin-bottom:8px;line-height:1.6}.prose table{border-collapse:collapse;width:100%;margin:24px 0;font-size:.9375rem}.prose th,.prose td{text-align:left;padding:10px 12px 10px 0;vertical-align:top}.prose tr+tr th,.prose tr+tr td{border-top:1px solid var(--border)}.prose th{color:var(--ink-2);font-weight:600}.site-header{position:sticky;top:0;z-index:30;background:var(--canvas);background:color-mix(in srgb,var(--canvas) 85%,transparent);-webkit-backdrop-filter:blur(12px);backdrop-filter:blur(12px);border-bottom:1px solid var(--border)}.site-header .wrap{display:flex;align-items:center;gap:24px;min-height:64px}.brand{font-family:var(--font-heading);font-weight:700;font-size:1.3125rem;color:var(--ink);text-decoration:none;display:inline-flex;align-items:center;gap:10px}.brand-logo{display:block;width:28px;height:28px}.about-logo{display:block;width:96px;height:96px;margin-bottom:24px}.site-nav{display:flex;gap:4px;margin-left:auto;flex-wrap:wrap}.site-nav a{color:var(--ink-2);text-decoration:none;font-weight:500;font-size:.9375rem;padding:10px 12px;border-radius:var(--radius);transition:background-color var(--duration-fast)ease,color var(--duration-fast)ease,box-shadow var(--duration-fast)ease}.site-nav a:hover{background:var(--hover);color:var(--ink)}.site-nav a[aria-current=page]{color:var(--accent);font-weight:600;box-shadow:inset 0 -2px 0 var(--accent);border-radius:var(--radius)var(--radius)0 0}.site-nav a[aria-current=page]:hover{color:var(--accent)}.nav-search{flex:none}.nav-search input[type=search]{font:inherit;font-size:.9375rem;padding:10px 14px;min-height:44px;width:200px;border:1px solid var(--border-strong);border-radius:var(--radius);background:var(--canvas);color:var(--ink)}.menu-btn{display:none}.drawer,.backdrop{display:none}main .wrap{padding-block:32px 64px}.crumbs{font-size:.875rem;color:var(--ink-2);margin-bottom:16px}.crumbs a{color:var(--ink-2);text-decoration:none}.crumbs a:hover{text-decoration:underline}.crumbs ol{list-style:none;display:flex;gap:8px;margin:0;padding:0;flex-wrap:wrap}.crumbs li+li::before{content:"/";margin-right:8px}.db-head{padding-block:48px 32px;max-width:720px}.db-head h1{font-size:2.75rem;letter-spacing:-.03em;margin-bottom:12px}.db-head p.lede{color:var(--ink-2);font-size:1.125rem;max-width:var(--measure);text-wrap:balance}.material-head{padding-block:8px 32px}.material-head h1{font-size:2.25rem;letter-spacing:-.025em;line-height:1.25;margin:0 0 12px}.material-head p.lede{color:var(--ink-2);font-size:1.0625rem;line-height:1.6;max-width:860px;margin:0}.hero-search{display:flex;align-items:center;gap:0;margin:24px 0 16px;border:1px solid var(--border-strong);border-radius:var(--radius);background:var(--canvas)}.hero-search input[type=search]{flex:1;font:inherit;padding:12px 4px 12px 16px;min-height:52px;min-width:0;border:0;background:0 0;color:var(--ink)}.hero-search input[type=search]:focus-visible{outline:none}.hero-search:focus-within{outline:2px solid var(--ink);outline-offset:2px}.hero-search button{display:inline-flex;align-items:center;justify-content:center;width:52px;min-height:52px;flex:none;background:0 0;border:0;color:var(--ink-2);cursor:pointer;border-radius:var(--radius);transition:background-color var(--duration-fast)ease,color var(--duration-fast)ease,transform var(--duration-fast)var(--ease-out)}.hero-search button:hover{background:var(--hover);color:var(--ink)}.hero-search button:active{transform:scale(var(--scale-press-btn))}.hero-centered{position:relative;text-align:center;padding-block:56px 40px;display:flex;flex-direction:column;align-items:center;justify-content:center;overflow:hidden}.hero-content{position:relative;z-index:2;max-width:760px;margin-inline:auto;display:flex;flex-direction:column;align-items:center}.hero-content h1{font-size:3rem;letter-spacing:-.02em;margin-bottom:16px;line-height:1.15}.hero-content p.lede{color:var(--ink-2);font-size:1.125rem;max-width:var(--measure);margin-inline:auto;margin-bottom:24px;text-wrap:balance}.hero-centered .hero-search{width:100%;max-width:560px;margin:0 auto}.hero-quick-search{display:flex;align-items:center;justify-content:center;gap:8px;flex-wrap:wrap;margin-top:14px}.hero-quick-label{color:var(--ink-2);font-size:.8125rem}.quick-chip{display:inline-flex;align-items:center;padding:4px 10px;font-size:.8125rem;font-weight:500;color:var(--ink-2);background:var(--canvas);border:1px solid var(--border-strong);border-radius:var(--radius);text-decoration:none;transition:background-color var(--duration-fast)ease,color var(--duration-fast)ease,border-color var(--duration-fast)ease,transform var(--duration-fast)var(--ease-out)}.quick-chip:hover{background:var(--hover);color:var(--ink);border-color:var(--accent)}.quick-chip:active{transform:scale(var(--scale-press-btn))}.hero-bg-globe{position:absolute;top:50%;left:50%;transform:translate(-50%,-50%);width:580px;height:580px;max-width:92vw;max-height:92vw;z-index:1;pointer-events:none;display:flex;align-items:center;justify-content:center}.hero-bg-globe canvas{width:100%;height:100%;aspect-ratio:1/1;display:block}.home-section{margin-top:48px}.matrix-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(240px,1fr));gap:12px;margin-top:16px}.matrix-card{position:relative;display:flex;align-items:center;padding:16px 20px;border:1px solid var(--border-strong);border-radius:var(--radius);background:var(--canvas);transition:background-color var(--duration-fast)ease,border-color var(--duration-fast)ease,transform var(--duration-fast)var(--ease-out)}.matrix-card:hover,.matrix-card:has(.card-hit:focus-visible){background:var(--hover);border-color:var(--accent)}.matrix-card:active{transform:scale(var(--scale-press-card))}.matrix-card-title{font-family:var(--font-heading);font-size:1.0625rem;font-weight:700;margin:0 0 2px;line-height:1.25}.matrix-card-meta{color:var(--ink-2);font-size:.875rem;margin:0}.chip-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(200px,1fr));gap:10px;margin-top:16px}.subject-chip{position:relative;display:flex;align-items:center;justify-content:space-between;gap:10px;padding:12px 14px;border:1px solid var(--border-strong);border-radius:var(--radius);background:var(--canvas);color:var(--ink);text-decoration:none;transition:background-color var(--duration-fast)ease,border-color var(--duration-fast)ease,transform var(--duration-fast)var(--ease-out)}.subject-chip:hover{background:var(--hover);border-color:var(--accent)}.subject-chip:active{transform:scale(var(--scale-press-btn))}.subject-chip-name{font-weight:600;font-size:.9375rem;color:var(--ink);min-width:0;flex:1;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.subject-chip-count{font-size:.75rem;font-weight:600;color:var(--ink-2);padding:2px 6px;background:var(--hover);border-radius:var(--radius);flex:none}.value-section{margin-top:48px}.value-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(240px,1fr));gap:12px;margin-top:16px}.value-card{display:flex;flex-direction:column;padding:20px;border:1px solid var(--border-strong);border-radius:var(--radius);background:var(--canvas);transition:background-color var(--duration-fast)ease,border-color var(--duration-fast)ease}.value-card:hover{background:var(--hover);border-color:var(--accent)}.value-card-head{display:flex;align-items:flex-start;justify-content:space-between;gap:12px;margin-bottom:8px}.value-card-title{font-family:var(--font-heading);font-size:1.0625rem;font-weight:700;margin:0;line-height:1.3}.value-card-num{font-family:var(--font-mono);font-size:.8125rem;font-weight:700;color:var(--ink-2);padding:2px 6px;background:var(--hover);border:1px solid var(--border);border-radius:var(--radius);flex:none;line-height:1}.value-card:hover .value-card-num{color:var(--accent);border-color:color-mix(in srgb,var(--accent) 35%,transparent)}.value-card-desc{font-size:.875rem;color:var(--ink-2);margin:0;line-height:1.55}.filter-wrap{margin:20px 0 16px;display:flex;flex-direction:column;gap:10px}.filter-main{display:flex;gap:8px;align-items:center}.filter-search-box{position:relative;flex:1 1 240px;display:flex;align-items:center}.filter-search-box .search-icon{position:absolute;left:14px;color:var(--ink-2);pointer-events:none}.filter-search-box input[type=search]{width:100%;font:inherit;font-size:.9375rem;padding:10px 14px 10px 40px;min-height:44px;border:1px solid var(--border-strong);border-radius:var(--radius);background:var(--canvas);color:var(--ink);transition:border-color var(--duration-fast)ease}.filter-search-box input[type=search]:focus{outline:2px solid var(--ink);outline-offset:-1px}.filter-actions{display:flex;gap:8px;align-items:center;flex:none}.filter-toggle-btn{display:inline-flex;align-items:center;gap:8px;padding:10px 14px;min-height:44px;font:inherit;font-size:.875rem;font-weight:600;color:var(--ink);background:var(--canvas);border:1px solid var(--border-strong);border-radius:var(--radius);cursor:pointer;transition:background-color var(--duration-fast)ease,border-color var(--duration-fast)ease,transform var(--duration-fast)var(--ease-out)}.filter-toggle-btn:hover{background:var(--hover);border-color:var(--ink)}.filter-toggle-btn:active{transform:scale(var(--scale-press-btn))}.filter-toggle-btn[aria-expanded=true]{background:var(--hover);border-color:var(--ink)}.filter-count-badge{display:inline-flex;align-items:center;justify-content:center;font-family:var(--font-mono);font-size:.75rem;font-weight:700;padding:1px 6px;border-radius:var(--radius);background:var(--ink);color:#fff;line-height:1.2}.filter-sort-wrap select{font:inherit;font-size:.875rem;font-weight:500;padding:10px 12px;min-height:44px;border:1px solid var(--border-strong);border-radius:var(--radius);background:var(--canvas);color:var(--ink);cursor:pointer}.filter-panel{border:1px solid var(--border-strong);border-radius:var(--radius);background:var(--canvas);padding:16px;opacity:0;transform:translateY(-6px);transition:opacity var(--duration-fast)var(--ease-out),transform var(--duration-fast)var(--ease-out)}.filter-panel.is-open{opacity:1;transform:translateY(0)}.filter-panel[hidden]{display:none}.filter-panel-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(180px,1fr));gap:12px}.filter-group{display:flex;flex-direction:column;gap:6px}.filter-group label{font-size:.8125rem;font-weight:600;color:var(--ink-2)}.filter-group select{font:inherit;font-size:.875rem;padding:8px 10px;min-height:40px;border:1px solid var(--border);border-radius:var(--radius);background:var(--canvas);color:var(--ink)}.filter-group select:focus{border-color:var(--ink);outline:2px solid var(--ink);outline-offset:-1px}.filter-chips-bar{display:flex;align-items:center;gap:6px;flex-wrap:wrap;padding-top:2px}.filter-chips-bar[hidden]{display:none}.filter-chip{display:inline-flex;align-items:center;gap:6px;padding:3px 8px;font-size:.75rem;font-weight:500;color:var(--ink);background:var(--hover);border:1px solid var(--border);border-radius:var(--radius)}.filter-chip button{background:0 0;border:0;padding:0;margin:0;color:var(--ink-2);cursor:pointer;display:inline-flex;align-items:center;justify-content:center;line-height:1;transition:color var(--duration-fast)ease,transform var(--duration-fast)var(--ease-out)}.filter-chip button:hover{color:var(--accent)}.filter-chip button:active{transform:scale(var(--scale-press-btn))}.filter-chips-clear{font:inherit;font-size:.75rem;color:var(--ink-2);text-decoration:underline;background:0 0;border:0;cursor:pointer;padding:2px 4px;margin-left:4px}.filter-chips-clear:hover{color:var(--accent)}.section-head{display:flex;align-items:center;gap:16px;margin:48px 0 0}.section-head.tight{margin-top:24px}.section-head h2{margin:0}.section-head a{font-size:.9375rem;margin-left:auto;white-space:nowrap;color:var(--ink-2)}.cards{list-style:none;margin:16px 0 0;padding:0;display:grid;gap:12px}.card{position:relative;display:flex;gap:16px;align-items:center;justify-content:space-between;padding:16px 20px;border-radius:var(--radius);border:1px solid var(--border-strong);background:var(--canvas);transition:background-color var(--duration-fast)ease,border-color var(--duration-fast)ease,transform var(--duration-fast)var(--ease-out)}.card:hover,.card:has(.card-hit:focus-visible){background:var(--hover);border-color:var(--accent)}.card:active{transform:scale(var(--scale-press-card))}@media(hover:hover) and (pointer:fine){.card:hover .card-arrow{color:var(--accent);transform:translateX(3px)}}.card:has(.card-hit:focus-visible) .card-arrow{color:var(--accent)}.card-hit{position:absolute;inset:0;border-radius:inherit}.card-hit:focus-visible{outline:2px solid var(--ink);outline-offset:2px}.card-main{min-width:0;flex:1}.card-title{font-family:var(--font-heading);font-size:1.0625rem;font-weight:700;margin:0 0 6px;line-height:1.3}.card-meta{display:flex;align-items:center;gap:8px;flex-wrap:wrap;color:var(--ink-2);font-size:.875rem;margin:0}.card-meta .badge{font-weight:500;font-size:.75rem;padding:2px 6px;border-radius:var(--radius);background:var(--hover);border:1px solid var(--border);color:var(--ink)}.card-meta-detail{color:var(--ink-2);font-size:.875rem}.card-arrow{flex:none;color:var(--ink-2);display:inline-flex;align-items:center;justify-content:center;transition:transform var(--duration-fast)var(--ease-out),color var(--duration-fast)ease}.badge{display:inline-flex;align-items:center;padding:3px 8px;font-size:.75rem;font-weight:600;border-radius:var(--radius);border:1px solid var(--border-strong);background:var(--hover);color:var(--ink)}.download-btn{display:inline-flex;align-items:center;justify-content:center;gap:10px;font-size:.9375rem;font-weight:600;padding:12px 20px;min-height:48px;border-radius:var(--radius);background:var(--accent);color:#fff;text-decoration:none;border:0;cursor:pointer;transition:opacity var(--duration-fast)ease,transform var(--duration-fast)var(--ease-out)}.download-btn:hover{opacity:.92;color:#fff}.download-btn:active{transform:scale(var(--scale-press-btn))}.download-btn svg{flex:none}.download-action{display:flex;align-items:center;gap:14px;margin:36px 0 32px;flex-wrap:wrap}.download-action .download-btn{flex:none}.download-action .download-meta{font-family:var(--font-mono);font-size:.8125rem;color:var(--ink-2);font-weight:500}.btn-more{display:block;width:100%;margin:16px 0 0;padding:12px 16px;min-height:48px;font:inherit;font-weight:600;color:var(--canvas);background:var(--ink);border:1px solid var(--ink);border-radius:var(--radius);cursor:pointer;transition:opacity var(--duration-fast)ease,transform var(--duration-fast)var(--ease-out)}.btn-more[hidden]{display:none}.btn-more:hover{opacity:.85}.btn-more:active{transform:scale(var(--scale-press-btn))}.empty-note{padding:32px 0;text-align:center;color:var(--ink-2);font-style:italic}.index-list{list-style:none;margin:8px 0 0;padding:0}.index-list>li{position:relative;padding:14px 16px;margin-inline:-16px;border-radius:var(--radius);transition:background-color var(--duration-fast)ease}.index-list>li+li{border-top:1px solid var(--border)}.row-hit{position:absolute;inset:0;cursor:pointer;border-radius:inherit}.row-hit:focus-visible{outline:2px solid var(--ink);outline-offset:-2px}.index-list>li:hover,.index-list>li:has(.row-hit:focus-visible){background:var(--hover)}@media(hover:hover) and (pointer:fine){.index-list>li:hover .row-arrow{color:var(--accent);transform:translateX(3px)}}.index-list>li:has(.row-hit:focus-visible) .row-arrow{color:var(--accent)}.index-list p.title,.index-list a.title{font-family:var(--font-heading);font-weight:600;color:var(--ink);font-size:1.0625rem;margin:0;line-height:1.3;text-decoration:none}.index-list .meta{color:var(--ink-2);font-size:.875rem;margin-top:3px;margin-bottom:0}.mark{display:inline-flex;align-items:center;justify-content:center;width:44px;height:44px;border-radius:50%;background:var(--ink);color:#fff;font-family:var(--font-mono);font-weight:700;font-size:.8125rem;letter-spacing:-.02em;flex:none}.row{display:flex;gap:16px;align-items:center}.row .grow{min-width:0;flex:1}.row-arrow{flex:none;color:var(--ink-2);display:inline-flex;align-items:center;justify-content:center;transition:transform var(--duration-fast)var(--ease-out),color var(--duration-fast)ease}.ghost-btn{font:inherit;font-size:.875rem;font-weight:500;padding:8px 14px;min-height:44px;border:0;border-radius:var(--radius);background:0 0;color:var(--ink-2);cursor:pointer;transition:background-color var(--duration-fast)ease,color var(--duration-fast)ease,transform var(--duration-fast)var(--ease-out);text-decoration:none;display:inline-flex;align-items:center;gap:6px}.ghost-btn:hover{background:var(--hover);color:var(--ink)}.ghost-btn:active{transform:scale(var(--scale-press-btn))}.split{display:grid;grid-template-columns:minmax(0,1fr)300px;gap:48px;align-items:start}.side{position:sticky;top:calc(var(--header-h) + 24px);display:grid;gap:12px;max-height:calc(100vh - var(--header-h) - 32px);overflow-y:auto;scrollbar-width:thin}.infobox{border:1px solid var(--border-strong);border-radius:var(--radius);padding:8px 20px 20px;font-size:.9375rem}.infobox dl{margin:8px 0 0}.infobox dl>div{display:flex;gap:12px;padding-block:6px}.infobox dl>div+div{border-top:1px solid var(--border)}.infobox dt{color:var(--ink-2);flex:0 0 45%;font-size:.875rem}.infobox dd{margin:0;flex:1;font-size:.875rem}.subtopics-list{list-style:none;margin:16px 0 24px;padding:0}.subtopics-list>li{padding:14px 0}.subtopics-list>li+li{border-top:1px solid var(--border)}.subtopics-list h3{font-size:1.0625rem;font-weight:600;margin:0 0 4px}.subtopics-list p{margin:0;color:var(--ink-2);font-size:.9375rem;line-height:1.5}.terms-list{margin:16px 0 24px;padding:0}.terms-list>div{padding:12px 0}.terms-list>div+div{border-top:1px solid var(--border)}.terms-list dt{font-weight:600;color:var(--ink);margin:0 0 4px;font-size:.9375rem}.terms-list dd{margin:0;color:var(--ink-2);font-size:.9375rem;line-height:1.5}.component-list{list-style:none;margin:8px 0 0;padding:0}.component-list li{display:flex;align-items:flex-start;gap:8px;padding:5px 0;font-size:.8125rem;color:var(--ink-2);line-height:1.4}.component-list li+li{border-top:1px solid var(--border)}.component-list svg{flex:none;stroke:var(--accent);margin-top:2px}.practice-section{margin-top:40px;padding-top:28px;border-top:1px solid var(--border)}.practice-section h2{margin-bottom:8px}.practice-section .section-desc{color:var(--ink-2);font-size:.9375rem;line-height:1.5;margin-bottom:24px}.quiz-list{display:flex;flex-direction:column;gap:20px}.quiz-card{border:1px solid var(--border);border-radius:var(--radius);background:var(--canvas);padding:20px;transition:border-color var(--duration-fast)ease}.quiz-card:hover{border-color:var(--border-strong)}.quiz-header{display:flex;align-items:center;justify-content:space-between;margin-bottom:12px}.quiz-badge{font-family:var(--font-mono);font-size:.75rem;font-weight:600;text-transform:uppercase;letter-spacing:.04em;color:var(--ink-2);background:var(--hover);padding:2px 6px;border-radius:var(--radius);border:1px solid var(--border)}.quiz-question{font-weight:500;font-size:1rem;color:var(--ink);line-height:1.5;margin:0 0 16px}.quiz-options{list-style:none;margin:0 0 16px;padding:0;display:grid;gap:8px}.quiz-option{padding:8px 12px;font-size:.9375rem;color:var(--ink);background:var(--hover);border:1px solid var(--border);border-radius:var(--radius);line-height:1.4;transition:background-color var(--duration-fast)ease}.spoiler{margin-top:12px;border-top:1px solid var(--border);padding-top:12px}.spoiler-toggle{display:inline-flex;align-items:center;gap:8px;cursor:pointer;font-size:.875rem;font-weight:600;color:var(--accent);user-select:none;list-style:none}.spoiler-toggle::-webkit-details-marker{display:none}.spoiler-toggle svg{flex:none;transition:transform var(--duration-fast)var(--ease-out)}.spoiler[open] .spoiler-toggle svg{transform:rotate(90deg)}.spoiler-toggle:hover{text-decoration:underline}.spoiler-content{margin-top:12px;padding:14px 16px;background:var(--hover);border-left:3px solid var(--accent);border-radius:0 var(--radius)var(--radius)0}.answer-badge{font-size:.875rem;color:var(--ink);margin-bottom:6px}.answer-badge strong{color:var(--accent)}.explanation-text{font-size:.875rem;color:var(--ink-2);line-height:1.5;margin:0}.explanation-text strong{color:var(--ink)}.quiz-footer-note{margin-top:16px;font-size:.875rem;color:var(--ink-2);line-height:1.5;font-style:italic}.site-footer{border-top:1px solid var(--border);color:var(--ink-2);font-size:.875rem}.site-footer .wrap{padding-block:32px;display:flex;align-items:center;justify-content:space-between;gap:12px 24px;flex-wrap:wrap}.foot-left{display:flex;flex-direction:column;gap:8px}.foot-nav,.foot-legal{display:flex;gap:4px 16px;flex-wrap:wrap}.foot-legal{font-size:.8125rem}.foot-nav a,.foot-legal a{color:var(--ink-2);text-decoration:none}.foot-nav a:hover,.foot-legal a:hover{color:var(--ink);text-decoration:underline}.foot-nav a[aria-current=page],.foot-legal a[aria-current=page]{color:var(--ink);font-weight:600}.site-footer .made{margin-left:0;margin-right:0;font-size:.875rem}@media(min-width:1024px){.wrap{padding-inline:48px}}@media(max-width:860px){:root{--header-h:65px}html{scroll-padding-top:calc(var(--header-h) + 12px)}body.no-scroll{overflow:hidden}.split{display:flex;flex-direction:column;gap:0}.side{position:static;top:auto;max-height:none;overflow-y:visible;order:-1;width:100%;margin-bottom:28px}.infobox{padding:14px 16px 16px}.material-head{padding-block:4px 20px}.material-head h1{font-size:1.75rem}.section-head{margin-top:40px;flex-direction:row;align-items:center;justify-content:space-between;gap:12px}.hero-centered{padding-block:36px 24px}.hero-content h1{font-size:2rem}.hero-bg-globe{width:360px;height:360px}.db-head h1{font-size:1.75rem}.db-head{padding-block:32px 24px}.hero-search{flex-direction:row}.hero-search input[type=search],.hero-search button{font-size:1rem}h1{font-size:1.625rem}.site-header .wrap{gap:12px;min-height:60px}.brand{margin-right:auto}.site-nav{display:none}.nav-search{display:none}.menu-btn{display:inline-flex;align-items:center;justify-content:center;width:48px;height:48px;flex:none;background:0 0;border:0;border-radius:var(--radius);color:var(--ink);cursor:pointer;transition:background-color var(--duration-fast)ease,transform var(--duration-fast)var(--ease-out)}.menu-btn:hover{background:var(--hover)}.menu-btn:active{transform:scale(var(--scale-press-btn))}.backdrop{display:block;position:fixed;inset:0;background:rgb(0 0 0/44%);z-index:40;opacity:0;transition:opacity var(--duration-drawer-close)var(--ease-drawer-close)}.backdrop[hidden]{display:none}.backdrop.is-open{opacity:1;transition:opacity var(--duration-drawer)var(--ease-out)}.drawer{display:block;position:fixed;top:0;right:0;bottom:0;width:min(320px,84vw);background:var(--canvas);z-index:50;border-left:1px solid var(--border);transform:translateX(100%);will-change:transform;transition:transform var(--duration-drawer-close)var(--ease-drawer-close)}.drawer[hidden]{display:none}.drawer.is-open{transform:translateX(0);transition:transform var(--duration-drawer)var(--ease-drawer)}.drawer-head{display:flex;align-items:center;justify-content:space-between;padding:8px 8px 8px 20px;min-height:60px;border-bottom:1px solid var(--border);font-weight:600}.drawer-close{display:inline-flex;align-items:center;justify-content:center;width:48px;height:48px;background:0 0;border:0;border-radius:var(--radius);color:var(--ink);cursor:pointer;transition:background-color var(--duration-fast)ease,transform var(--duration-fast)var(--ease-out)}.drawer-close:hover{background:var(--hover)}.drawer-close:active{transform:scale(var(--scale-press-btn))}.drawer-nav{display:flex;flex-direction:column;padding:8px}.drawer-search{padding:8px}.drawer-search input[type=search]{font:inherit;font-size:1rem;padding:10px 14px;min-height:48px;width:100%;border:1px solid var(--border-strong);border-radius:var(--radius);background:var(--canvas);color:var(--ink)}.drawer-nav a{display:flex;align-items:center;min-height:52px;padding:12px 16px;border-left:3px solid transparent;border-radius:0 var(--radius)var(--radius)0;color:var(--ink);text-decoration:none;font-weight:500;transition:background-color var(--duration-fast)ease,color var(--duration-fast)ease,border-color var(--duration-fast)ease}.drawer-nav a:hover{background:var(--hover)}.drawer-nav a[aria-current=page]{background:var(--hover);color:var(--accent);font-weight:600;border-left-color:var(--accent)}.drawer-nav a[aria-current=page]:hover{color:var(--accent)}.filter-main{flex-direction:column;align-items:stretch;gap:8px}.filter-search-box{width:100%;flex:none}.filter-actions{display:grid;grid-template-columns:1fr 1fr;width:100%;gap:8px}.filter-toggle-btn,.filter-sort-wrap select{width:100%;justify-content:center}.filter-panel-grid{grid-template-columns:1fr}.card{padding:14px 16px}.download-action{flex-direction:column;align-items:flex-start;gap:8px;margin:28px 0 24px}.download-action .download-btn{width:100%}.index-list>li{padding:14px 12px;margin-inline:-12px}.site-footer .wrap{flex-direction:column;align-items:center;text-align:center;gap:12px;padding-block:24px}.foot-left{align-items:center;gap:6px}.foot-nav{justify-content:center;gap:4px 12px;row-gap:6px}.foot-legal{justify-content:center;gap:4px 12px}.site-footer .made{margin-left:0;padding-top:0;font-size:.8125rem}}@media(prefers-reduced-motion:reduce){*,*::before,*::after{animation-duration:.01ms!important;animation-iteration-count:1!important}.filter-panel{transition:none;opacity:1;transform:none!important}.drawer{transition:none}.backdrop{transition:none}.card-arrow,.row-arrow{transition:none;transform:none!important}.spoiler-toggle svg{transition:none}.download-btn:active,.btn-more:active,.ghost-btn:active,.menu-btn:active,.drawer-close:active,.quick-chip:active,.filter-toggle-btn:active,.filter-chip button:active,.matrix-card:active,.subject-chip:active,.hero-search button:active,.card:active{transform:none!important}}