:root{--color-bg: #f5f7fa;--color-ink: #1c2430;--color-primary: #2f5c8f;--color-primary-hover: #244a73;--color-border: #d5dce6;--color-muted: #5b6777;--color-surface: #ffffff;--color-success: #1f6b4a;--color-danger: #9b2c2c;--color-warn: #8a6d1f;--font-display: "Fraunces", "Source Serif 4", Georgia, serif;--font-body: "Source Sans 3", "Segoe UI", sans-serif;--font-mono: "IBM Plex Mono", ui-monospace, monospace;--radius-sm: 4px;--radius-md: 8px;--shadow-soft: 0 1px 0 rgba(28, 36, 48, .04)}*,*:before,*:after{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;min-height:100vh;font-family:var(--font-body);color:var(--color-ink);background:radial-gradient(1200px 500px at 10% -10%,#dfe8f3 0%,transparent 55%),radial-gradient(900px 400px at 100% 0%,#e7eef6 0%,transparent 50%),linear-gradient(180deg,#eef2f7 0%,var(--color-bg) 40%,#f7f9fc 100%);line-height:1.5}a{color:var(--color-primary);text-decoration-thickness:1px;text-underline-offset:2px}a:hover{color:var(--color-primary-hover)}img{max-width:100%}h1,h2,h3{font-family:var(--font-display);line-height:1.2;font-weight:600;letter-spacing:-.02em}.container{width:min(1120px,calc(100% - 2rem));margin-inline:auto}.site-header{position:sticky;top:0;z-index:40;backdrop-filter:blur(10px);background:#f5f7fae0;border-bottom:1px solid var(--color-border)}.site-header-inner{display:flex;align-items:center;justify-content:space-between;gap:1rem;padding:.85rem 0}.brand{font-family:var(--font-display);font-size:1.15rem;font-weight:700;color:var(--color-ink);text-decoration:none}.brand span{color:var(--color-primary)}.nav{display:flex;flex-wrap:wrap;gap:.85rem 1.1rem;align-items:center}.nav a{color:var(--color-ink);text-decoration:none;font-weight:600;font-size:.95rem}.nav a:hover{color:var(--color-primary)}.site-footer{margin-top:4rem;border-top:1px solid var(--color-border);background:#ffffff8c}.site-footer-inner{display:grid;gap:1.5rem;padding:2rem 0 2.5rem;grid-template-columns:1.2fr 1fr 1fr}.site-footer h2{font-size:.85rem;text-transform:uppercase;letter-spacing:.06em;color:var(--color-muted);margin:0 0 .6rem}.site-footer ul{list-style:none;margin:0;padding:0;display:grid;gap:.35rem}.site-footer a{color:var(--color-ink);text-decoration:none;font-size:.95rem}.site-footer a:hover{color:var(--color-primary)}.muted{color:var(--color-muted)}.prose{max-width:68ch}.prose h2{margin-top:2rem}.faq details{border:1px solid var(--color-border);background:var(--color-surface);border-radius:var(--radius-md);padding:.85rem 1rem;margin:.6rem 0}.faq summary{cursor:pointer;font-weight:650}.section{padding:2.5rem 0}.section-title{margin:0 0 .5rem;font-size:clamp(1.5rem,2vw,1.85rem)}.grid-two{display:grid;gap:1.25rem;grid-template-columns:1.1fr .9fr}@media(max-width:900px){.grid-two,.site-footer-inner{grid-template-columns:1fr}.nav{justify-content:flex-end}}:root{--color-skeleton: #e8eef5;--color-skeleton-shine: rgba(255, 255, 255, .72)}.acm-skeleton{position:relative;overflow:hidden;background:var(--color-skeleton);isolation:isolate}.acm-skeleton:after{content:"";position:absolute;inset:0;transform:translate(-120%);background:linear-gradient(105deg,transparent 0%,transparent 38%,var(--color-skeleton-shine) 50%,transparent 62%,transparent 100%);animation:acm-shimmer 1.35s ease-in-out infinite;pointer-events:none}.acm-skeleton--static,.acm-skeleton--static:after{animation:none!important}.acm-skeleton--static:after{content:none}@keyframes acm-shimmer{0%{transform:translate(-120%)}to{transform:translate(120%)}}.acm-content-enter{animation:acm-content-enter .38s ease-out both}@keyframes acm-content-enter{0%{opacity:0;transform:translateY(.45rem)}to{opacity:1;transform:translateY(0)}}@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}*{animation:none!important;transition:none!important}.acm-skeleton:after{content:none}.acm-content-enter{opacity:1;transform:none}}.print-btn{display:inline-block;font-family:var(--font-body);font-size:.95rem;font-weight:650;padding:.45rem .9rem;border-radius:var(--radius-md);border:1px solid var(--color-primary);background:var(--color-primary);color:#fff;text-decoration:none;cursor:pointer}.print-btn-secondary{background:#fff;color:var(--color-primary)}.example-grid-frame{overflow:auto;background:#fff;padding:.75rem;border:1px solid var(--color-border);border-radius:8px}@media print{body{background:#fff!important;color:#000}.site-header,.site-footer,.no-print{display:none!important}.container{width:100%;max-width:none;margin:0}.example-page{padding-top:0!important}.example-grid-frame{border:none;padding:0}.grid-two{grid-template-columns:1.1fr .9fr;gap:1rem}.example-answer-key{break-before:page;border:none!important;padding:0!important}.example-answer-key summary{list-style:none}a{color:#000;text-decoration:none}}