:root {
    --accent: #4f46e5; --accent-dark: #4338ca; --accent-soft: #eef2ff;
    --ink: #0f172a; --text: #334155; --muted: #64748b; --line: #e2e8f0;
    --bg: #f8fafc; --card: #ffffff; --ok: #059669; --warn: #b45309;
    --radius: 14px; --shadow: 0 1px 2px rgba(15,23,42,.04), 0 8px 24px rgba(15,23,42,.06);
}
* { box-sizing: border-box; }
body { margin: 0; background: var(--bg); color: var(--text);
       font: 16px/1.6 ui-sans-serif, system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif; -webkit-font-smoothing: antialiased; }
a { color: var(--accent); }
.wrap { max-width: 1120px; margin: 0 auto; padding: 0 20px; }
h1, h2, h3 { color: var(--ink); line-height: 1.25; text-wrap: balance; }
.site-header { position: sticky; top: 0; z-index: 10; background: rgba(248,250,252,.85); backdrop-filter: saturate(180%) blur(10px); border-bottom: 1px solid var(--line); }
.site-header .wrap { display: flex; align-items: center; gap: 18px; height: 60px; }
.brand { display: flex; align-items: center; gap: 10px; text-decoration: none; color: var(--ink); font-weight: 700; font-size: 18px; letter-spacing: -.01em; }
.brand svg { width: 30px; height: 30px; flex: none; }
.site-header nav { margin-left: auto; display: flex; gap: 20px; font-size: 14px; }
.site-header nav a { color: var(--muted); text-decoration: none; white-space: nowrap; }
.site-header nav a:hover, .site-header nav a[aria-current] { color: var(--ink); }
.cta { display: inline-flex; align-items: center; gap: 8px; background: var(--accent); color: #fff; text-decoration: none; font-weight: 600;
       padding: 14px 26px; border-radius: 12px; box-shadow: 0 6px 18px rgba(79,70,229,.28); transition: background .15s, transform .15s; }
.cta:hover { background: var(--accent-dark); transform: translateY(-1px); }
.article { max-width: 760px; margin: 0 auto; padding: 40px 0 0; }
.crumbs { font-size: 13.5px; color: var(--muted); margin: 0 0 14px; }
.crumbs a { color: var(--muted); }
.article h1 { font-size: clamp(27px, 4.4vw, 40px); letter-spacing: -.02em; margin: 0 0 14px; }
.lede { font-size: 18px; color: var(--muted); margin: 0 0 22px; }
.article .code-tag { display: inline-flex; gap: 8px; flex-wrap: wrap; margin: 0 0 22px; padding: 0; list-style: none; }
.code-tag li { font-size: 13px; font-weight: 600; color: var(--ink); background: var(--card); border: 1px solid var(--line); border-radius: 999px; padding: 5px 12px; }
.article h2 { font-size: 22px; margin: 38px 0 10px; letter-spacing: -.01em; scroll-margin-top: 76px; }
.article h3 { font-size: 16px; margin: 18px 0 6px; }
.article p, .article li { font-size: 16.5px; }
.article ul, .article ol { padding-left: 22px; }
.article li + li { margin-top: 6px; }
.evidence { list-style: none; padding: 0 !important; display: grid; gap: 10px; }
.evidence li { background: var(--card); border: 1px solid var(--line); border-radius: 12px; padding: 12px 14px; margin: 0 !important; box-shadow: var(--shadow); }
.evidence strong { color: var(--ink); display: block; }
.evidence span { color: var(--muted); font-size: 15px; }
.platforms { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; }
.platforms > div { background: var(--card); border: 1px solid var(--line); border-radius: 12px; padding: 14px 16px 6px; box-shadow: var(--shadow); min-width: 0; }
.platforms h3 { margin: 0 0 6px; }
.platforms ol { margin: 0 0 8px; padding-left: 20px; }
.platforms li, .platforms p { font-size: 15px !important; }
.platforms p { color: var(--muted); margin: 0 0 10px; }
.deadline { padding: 12px 14px; border-radius: 12px; background: #fffbeb; border: 1px solid #fde68a; color: #92400e; font-weight: 600; font-size: 15.5px !important; }
.cta-box { margin: 40px 0 0; padding: 24px; border-radius: 18px; background: var(--accent-soft); border: 1px solid #c7d2fe; text-align: center; }
.cta-box h2 { margin: 0 0 6px !important; }
.cta-box p { margin: 0 0 16px; color: var(--text); }
.faq details { background: var(--card); border: 1px solid var(--line); border-radius: 12px; padding: 0 18px; margin-top: 10px; box-shadow: var(--shadow); }
.faq summary { cursor: pointer; list-style: none; padding: 15px 0; font-weight: 600; color: var(--ink); display: flex; justify-content: space-between; gap: 12px; }
.faq summary::-webkit-details-marker { display: none; }
.faq summary::after { content: "+"; color: var(--accent); font-size: 20px; line-height: 1; }
.faq details[open] summary::after { content: "–"; }
.faq details p { margin: 0 0 16px; font-size: 15.5px; }
.related { list-style: none; padding: 0 !important; display: grid; gap: 8px; }
.related li { margin: 0 !important; }
.related a { display: block; background: var(--card); border: 1px solid var(--line); border-radius: 12px; padding: 12px 14px; text-decoration: none; color: var(--ink); font-weight: 600; font-size: 15.5px; }
.related a span { display: block; color: var(--muted); font-weight: 400; font-size: 14px; }
.related a:hover { border-color: #c7d2fe; }
.note { font-size: 14px !important; color: var(--muted); border-top: 1px solid var(--line); padding-top: 16px; margin-top: 36px; }
.gindex { max-width: 900px; margin: 0 auto; padding: 40px 0 0; }
.gindex h1 { font-size: clamp(28px, 4.6vw, 42px); letter-spacing: -.02em; margin: 0 0 12px; }
.gindex h2 { font-size: 20px; margin: 34px 0 10px; }
.glist { list-style: none; padding: 0; margin: 0; display: grid; grid-template-columns: 1fr 1fr; gap: 10px; }
.glist a { display: block; height: 100%; background: var(--card); border: 1px solid var(--line); border-radius: 12px; padding: 12px 14px; text-decoration: none; color: var(--ink); font-weight: 600; box-shadow: var(--shadow); }
.glist a span { display: block; color: var(--muted); font-weight: 400; font-size: 14px; }
.glist a:hover { border-color: #c7d2fe; }
.site-footer { margin-top: 72px; border-top: 1px solid var(--line); background: #fff; padding: 36px 0 44px; font-size: 14px; color: var(--muted); }
.site-footer .cols { display: grid; grid-template-columns: 1.2fr 1fr 1fr; gap: 28px; }
.site-footer h3 { font-size: 14px; margin: 0 0 8px; color: var(--ink); }
.site-footer p { margin: 0 0 8px; }
.disclaimer { font-size: 12.5px; color: var(--muted); margin-top: 26px; padding-top: 18px; border-top: 1px solid var(--line); }
.disclaimer p { margin: 0 0 6px; }
@media (max-width: 640px) {
    .wrap { padding: 0 16px; }
    .site-header nav { gap: 14px; font-size: 13.5px; }
    .brand { font-size: 17px; }
    .article, .gindex { padding-top: 26px; }
    .lede { font-size: 16.5px; }
    .platforms, .glist { grid-template-columns: 1fr; }
    .cta { width: 100%; justify-content: center; }
    .site-footer .cols { grid-template-columns: 1fr; gap: 18px; }
}
@media (max-width: 480px) { .site-header nav a.hide-sm { display: none; } }