:root { color-scheme: light; --ink:#1d1d1f; --muted:#5d5d62; --blue:#0067d9; --wash:#f5f5f7; --line:#dedee3; }
* { box-sizing:border-box; }
html { scroll-padding-top:90px; }
body { margin:0; background:#fff; color:var(--ink); font:17px/1.6 -apple-system,BlinkMacSystemFont,"SF Pro Text","Segoe UI",system-ui,sans-serif; -webkit-font-smoothing:antialiased; }
a { color:var(--blue); text-underline-offset:3px; }
a:hover { color:#004caa; }
a:focus-visible,summary:focus-visible,button:focus-visible { outline:3px solid #c86700; outline-offset:5px; }
img { display:block; max-width:100%; }
button { font:inherit; }
h1,h2,h3 { text-wrap:pretty; }
.container { max-width:1120px; margin:0 auto; padding:0 clamp(20px,4vw,32px); }
.skip-link { position:fixed; top:8px; left:16px; transform:translateY(-160%); z-index:100; padding:12px 20px; background:#fff; border:2px solid var(--blue); border-radius:6px; }
.skip-link:focus { transform:none; }
.site-header { position:sticky; top:0; z-index:50; background:rgba(255,255,255,.96); border-bottom:1px solid #e9e9ec; }
.nav-wrap { position:relative; max-width:1120px; min-height:68px; margin:auto; padding:0 clamp(20px,4vw,32px); display:flex; align-items:center; justify-content:space-between; gap:16px; }
.brand { display:flex; align-items:center; gap:10px; min-height:44px; font-size:17px; font-weight:600; letter-spacing:-.01em; color:inherit; text-decoration:none; }
.brand img { width:36px; height:36px; border-radius:9px; flex:none; }
.desktop-nav { display:flex; gap:24px; align-items:center; font-size:15px; font-weight:500; }
.desktop-nav a { text-decoration:none; color:var(--muted); white-space:nowrap; }
.button,.desktop-nav .button { display:inline-flex; align-items:center; justify-content:center; min-height:46px; padding:10px 22px; border:0; border-radius:999px; background:var(--blue); color:#fff; font-weight:600; text-decoration:none; text-align:center; }
.button:hover,.desktop-nav .button:hover { background:#004caa; color:#fff; }
.button.secondary { background:#e8f1ff; color:#004caa; }
.mobile-menu { display:none; flex-shrink:0; }
.mobile-menu summary { cursor:pointer; padding:8px 12px; border:1px solid var(--line); border-radius:22px; font-size:15px; white-space:nowrap; }
.mobile-menu nav { position:absolute; top:68px; left:0; right:0; padding:12px 24px 20px; background:white; border-bottom:1px solid var(--line); box-shadow:0 12px 16px #00000008; }
.mobile-menu nav a { display:block; padding:12px 0; text-decoration:none; border-bottom:1px solid var(--line); }
.mobile-menu nav a:last-child { border:0; }
.site-footer { padding:52px 0 24px; background:#1d1d1f; color:#fff; }
.footer-grid { display:grid; grid-template-columns:1.1fr 1fr; gap:24px 64px; }
.site-footer p { color:#c7c7cc; max-width:440px; }
.site-footer a { color:#e3e8f2; }
.site-footer nav { display:grid; gap:12px; align-content:start; }
.site-footer nav a { text-decoration:none; }
.copyright { grid-column:1/-1; margin:12px 0 0; }
.small,.image-caption { font-size:14px; line-height:1.55; }
.image-caption { flex-basis:100%; color:var(--muted); text-align:center; max-width:520px; margin:16px 0 0; }
.hero-illustrations { display:grid; grid-template-columns:1fr 1fr; align-items:start; gap:24px; }
.hero-illustrations img { width:100%; height:auto; max-width:270px; }
.hero-illustrations .image-caption { grid-column:1/-1; }
.hero-guide-link { margin:24px 0 0; font-size:16px; max-width:480px; }
.eyebrow { margin:0 0 14px; font-size:13px; line-height:1.5; font-weight:700; letter-spacing:.08em; color:var(--blue); text-transform:uppercase; }
.guides-section { padding:clamp(56px,8vw,96px) 0; background:#f5f5f7; }
.guides-section h2 { font-size:clamp(30px,4vw,44px); line-height:1.15; letter-spacing:-.025em; max-width:700px; margin:0 0 36px; }
.reading-list { border-top:1px solid #cdcdd3; }
.reading-list>a { display:grid; grid-template-columns:42px 1fr 24px; gap:20px; padding:28px 0; border-bottom:1px solid #cdcdd3; text-decoration:none; color:var(--ink); align-items:start; }
.reading-list>a:hover :is(h2,h3) { color:var(--blue); text-decoration:underline; }
.reading-list h3,.article .reading-list h2 { margin:0 0 8px; font-size:25px; font-weight:600; line-height:1.25; letter-spacing:-.02em; }
.reading-list p { color:var(--muted); margin:0; max-width:720px; }
.reading-number { font:500 14px/2.2 ui-monospace,monospace; color:var(--blue); }
.article { max-width:850px; margin:auto; padding:48px clamp(20px,4vw,32px) 80px; }
.article.wide { max-width:1050px; }
.breadcrumbs { color:var(--muted); font-size:14px; margin:0 0 32px; }
.breadcrumbs a { color:var(--muted); }
.article h1 { font-size:clamp(36px,5.8vw,58px); line-height:1.08; letter-spacing:-.035em; margin:0 0 24px; }
.article .lede { font-size:clamp(19px,2.5vw,23px); color:var(--muted); line-height:1.5; }
.byline { font-size:14px; color:var(--muted); padding-bottom:28px; border-bottom:1px solid var(--line); margin-bottom:32px; }
.article h2 { font-size:clamp(25px,3.2vw,32px); line-height:1.2; letter-spacing:-.02em; margin:48px 0 18px; }
.article h3 { font-size:21px; line-height:1.3; margin:28px 0 12px; }
.article p { margin:0 0 20px; }
.article li { margin:10px 0; }
.article ul,.article ol { padding-left:24px; }
.article .toc { padding:20px 24px; background:var(--wash); border-left:3px solid var(--blue); margin:32px 0; }
.toc p { margin:0 0 10px; font-weight:600; }
.toc ol { margin:0; }
.note { padding:22px 24px; background:#e8f1ff; border-left:3px solid var(--blue); margin:28px 0; }
.note p:last-child { margin-bottom:0; }
.source-list { font-size:15px; color:var(--muted); }
.product-bridge { margin-top:48px; padding:32px; background:var(--wash); border-radius:20px; }
.product-bridge h2 { margin-top:0; }
.actions { display:flex; flex-wrap:wrap; align-items:center; gap:14px; margin:24px 0; }
.table-scroll { overflow-x:auto; margin:24px 0; border:1px solid var(--line); border-radius:10px; }
table { border-collapse:collapse; width:100%; font-size:15px; text-align:left; }
th { background:var(--wash); font-weight:600; }
th,td { padding:14px 16px; border-bottom:1px solid var(--line); vertical-align:top; }
tr:last-child td { border-bottom:0; }
caption { text-align:left; padding:16px; color:var(--muted); font-size:14px; }
.prompt-key { display:flex; gap:10px; flex-wrap:wrap; margin:20px 0; }
.prompt-key span { background:var(--wash); padding:6px 12px; border-radius:6px; font-size:14px; }
.example-figure { margin:36px 0; display:grid; grid-template-columns:230px 1fr; gap:36px; align-items:center; }
.example-figure img { width:230px; height:auto; filter:drop-shadow(0 12px 20px #00000015); }
.example-figure figcaption { font-size:16px; }
.example-figure strong { display:block; font-size:23px; margin-bottom:12px; }
.print-sheet .blank { height:54px; }
.print-meta { display:flex; flex-wrap:wrap; gap:20px 40px; padding:16px 0; border-bottom:1px solid var(--line); margin-bottom:20px; }
.print-button { display:none; }
.js-ready .print-button { display:inline-flex; }
@media(max-width:959px) { .desktop-nav { display:none; } .mobile-menu { display:block; } }
@media(max-width:600px) {
 .nav-wrap { gap:10px; } .brand { font-size:15px; gap:8px; } .brand img { width:32px; height:32px; }
 .footer-grid { grid-template-columns:1fr; gap:28px; } .reading-list>a { grid-template-columns:26px 1fr 16px; gap:10px; } .reading-list h3 { font-size:22px; }
 .article { padding-top:32px; } .product-bridge { padding:24px; } .example-figure { grid-template-columns:1fr; } .example-figure img { margin:auto; }
 th,td { padding:12px 10px; } .article .toc { padding:18px; }
 nav[aria-label="Contents"] ol { columns:1!important; }
}
@media(prefers-reduced-motion:reduce) { *,*::before,*::after { scroll-behavior:auto!important; } }
@media print {
 @page { size:landscape; margin:12mm; }
 body { font-size:11pt; color:#000; }
 .site-header,.site-footer,.skip-link,.no-print { display:none!important; }
 .article.print-sheet { max-width:none; padding:0; }
 .print-sheet h1 { font-size:25pt; margin:0 0 10px; }
 .print-sheet p { margin:0 0 10px; }
 .print-sheet .table-scroll { overflow:visible; border-radius:0; margin:14px 0; }
 .print-sheet .blank { height:40px; }
 .print-sheet th,.print-sheet td { padding:8px; font-size:10pt; }
 .print-sheet .prompt-key { margin:10px 0; }
 .print-sheet .print-meta { margin:10px 0; padding:8px 0; }
 .print-sheet { break-inside:avoid; }
}