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1vw,1.8rem)}.container.compact{max-width:480px}.container.medium{max-width:880px}.grid.align-start{align-items:start}.grid.align-stretch{align-items:stretch}.row.tight{gap:6px}.row.centre{justify-content:center}.plain-list{margin:0;padding:0;list-style:none}.source-list{padding-left:18px}summary{cursor:pointer}.summary-strong{font-weight:650}.card.pad-sm{padding:12px 14px}.textarea.tall{min-height:180px}.radio-inline{margin-right:8px}.inline-select{width:auto;max-width:280px}.col-progress{min-width:140px}.cell-wrap{overflow-wrap:anywhere;max-width:400px}.stem.compact{font-size:1.02rem}.choice-letter{min-width:18px;font-weight:800;display:inline-block}.topic-group-head{padding:2px 10px 6px}.centred{text-align:center}.row.end{justify-content:flex-end}.row.between{justify-content:space-between}.grid{gap:16px;display:grid}@media (min-width:720px){:root{--gutter:24px}.grid.cols-2{grid-template-columns:repeat(2,minmax(0,1fr))}.grid.cols-3{grid-template-columns:repeat(3,minmax(0,1fr))}.grid.cols-4{grid-template-columns:repeat(4,minmax(0,1fr))}}.muted{color:var(--text-muted)}.faint{color:var(--text-faint)}.small{font-size:.875rem}.tabular{font-variant-numeric:tabular-nums}.site-header{z-index:20;background:var(--navy);border-bottom:1px solid var(--header-border);position:sticky;top:0}.site-header .container{height:var(--header-h);align-items:center;gap:16px;display:flex}.brand{min-height:var(--tap);font-family:var(--font-display);color:var(--text);letter-spacing:-.035em;align-items:center;gap:8px;font-size:1.3rem;font-weight:800;line-height:1;text-decoration:none;display:inline-flex}.brand:hover{color:var(--text)}.brand-mark{flex:none;width:36px;height:36px}.brand-mark.small-mark{width:28px;height:28px}.deck-mark .deck-back,.deck-mark .deck-middle{fill:var(--navy)}.deck-mark .deck-back{opacity:.24}.deck-mark 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.container{gap:20px;display:grid}.footer-brand{flex-wrap:wrap;align-items:center;gap:4px 16px;display:flex}.site-footer .brand{min-height:0;font-size:1.15rem}.site-footer nav{flex-wrap:wrap;gap:0 20px;display:flex}.site-footer nav a{min-width:var(--tap);min-height:var(--tap);color:var(--text-muted);align-items:center;font-weight:500;text-decoration:none;display:inline-flex}.site-footer nav a:hover{color:var(--text);text-decoration:underline}@media (pointer:fine){.site-footer nav a{min-height:32px}}.demo-banner{background:var(--accent-soft);color:var(--accent-ink);border-bottom:1px solid color-mix(in srgb, var(--accent) 45%, transparent);padding:8px 0;font-size:.875rem}.btn{--btn-bg:var(--bg-elevated);--btn-fg:var(--text);--btn-border:var(--border-strong);border:1px solid 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(pointer:coarse){.btn-sm{min-height:var(--tap);padding-inline:14px}}.btn-lg{border-radius:14px;min-height:52px;padding:14px 24px;font-size:1.05rem}.btn-block{width:100%}.btn[aria-busy=true]{opacity:1;cursor:progress}.btn[aria-busy=true]:before{content:"";border:2px solid;border-right-color:#0000;border-radius:50%;flex:none;width:1em;height:1em;animation:.7s linear infinite spin}@keyframes spin{to{rotate:360deg}}kbd{border:1px solid var(--border-strong);background:var(--bg-elevated);color:var(--text-muted);border-bottom-width:2px;border-radius:6px;padding:1px 6px;font-family:ui-monospace,SFMono-Regular,Menlo,monospace;font-size:.75em}.card{background:var(--bg-elevated);border:1px solid var(--border);border-radius:var(--radius);box-shadow:var(--shadow-sm);padding:20px}.card.pad-lg{padding:22px}@media (min-width:720px){.card.pad-lg{padding:28px}}.card h3{margin-bottom:6px}.card-link{color:inherit;text-decoration:none;transition:transform .12s,box-shadow .12s,border-color 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.container{grid-template-columns:1.1fr .9fr}}.hero h1{letter-spacing:-.03em;margin-bottom:18px;font-size:clamp(2.1rem,1.4rem + 3.2vw,3.6rem)}.hero h1 .highlight{text-decoration-line:underline;-webkit-text-decoration-color:color-mix(in srgb, var(--accent) 75%, transparent);text-decoration-color:color-mix(in srgb, var(--accent) 75%, transparent);text-underline-offset:-.16em;text-decoration-skip-ink:none;text-decoration-thickness:.3em}@media (prefers-color-scheme:dark){.hero h1 .highlight{color:var(--accent);text-decoration-line:none}}.hero .lead{color:var(--text-muted);max-width:54ch;margin-bottom:26px;font-size:clamp(1.05rem,1rem + .4vw,1.25rem)}.hero-actions>.btn{flex:auto}@media (min-width:560px){.hero-actions>.btn{flex:none}}.hero-finder{max-width:520px;margin:0 0 18px}.hero-finder .input{min-height:52px;box-shadow:var(--shadow)}.hero-finder .combobox-icon,.hero-finder .combobox-actions{top:26px}.hero .proof{color:var(--text-muted);flex-wrap:wrap;gap:10px 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