:root {
  --ink: #141414; --body: #3A3A3A; --muted: #6A6A6A; --faint: #9A9A9A; --rule: #E4E4E4;
  --page: #FFFFFF; --warm: #FAF8F4; --frame: #EFEFEC; --mark: #2B2B2B; --mark-soft: #BDBDB8;
  --pass: #1F6F43; --fail: #A1301F;
  --serif: Newsreader, Georgia, serif; --mono: 'IBM Plex Mono', ui-monospace, monospace;
  --gutter: clamp(16px, 3vw, 40px); --ease: cubic-bezier(.22,.8,.24,1);
}
* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; }
body { margin: 0; background: var(--page); color: var(--ink); font-family: var(--serif); }
a { color: var(--ink); }
p { margin: 0; }
button, select { font: inherit; color: inherit; background: none; border: 0; padding: 0; cursor: pointer; }
.label { font-family: var(--mono); font-size: 12px; letter-spacing: .08em; text-transform: uppercase; color: var(--muted); }
.mono { font-family: var(--mono); font-size: 13px; }
.note { font-family: var(--mono); font-size: 11.5px; line-height: 1.6; color: var(--muted); }
.wrap { max-width: 1280px; margin: 0 auto; }

header.top { position: sticky; top: 0; z-index: 20; background: rgba(255,255,255,.96); backdrop-filter: blur(6px); border-bottom: 1px solid var(--rule); }
header.top .wrap { display: flex; justify-content: space-between; align-items: center; gap: 12px; flex-wrap: wrap; padding: 14px var(--gutter); }
header.top a { text-decoration: none; }
header.top .brand { display: flex; align-items: baseline; gap: 10px; }
header.top nav { display: flex; flex-wrap: wrap; gap: 4px 16px; }
header.top nav a { color: var(--muted); } header.top nav a:hover, header.top nav a[aria-current="page"] { color: var(--ink); }

.intro { padding: 36px var(--gutter) 8px; }
.intro h1 { margin: 6px 0 10px; font-weight: 400; font-size: clamp(30px, 4vw, 44px); line-height: 1.1; letter-spacing: -.015em; }
.intro p.lede { font-size: 19px; line-height: 1.5; color: var(--body); max-width: 780px; }
.facts { display: flex; flex-wrap: wrap; gap: 6px 22px; margin-top: 16px; }
.facts span { font-family: var(--mono); font-size: 12px; color: var(--muted); }
.facts b { font-weight: 500; color: var(--ink); }
.banner { margin-top: 16px; font-family: var(--mono); font-size: 12px; color: var(--ink); background: var(--warm); border: 1px solid var(--rule); padding: 10px 14px; border-radius: 4px; max-width: 780px; }

section { padding: 40px var(--gutter); border-bottom: 1px solid var(--rule); scroll-margin-top: 56px; }
section h2 { margin: 0 0 6px; font-weight: 400; font-size: 28px; line-height: 1.2; }
.sechead { display: flex; justify-content: space-between; align-items: flex-end; gap: 16px; flex-wrap: wrap; margin-bottom: 18px; }
.sechead p { font-size: 17px; line-height: 1.5; color: var(--body); max-width: 760px; }
.prose { font-size: 17px; line-height: 1.6; color: var(--body); max-width: 780px; }
.prose p + p { margin-top: 12px; }

.seg { display: inline-flex; flex-wrap: wrap; border: 1px solid var(--rule); border-radius: 5px; overflow: hidden; }
.seg button { font-family: var(--mono); font-size: 12px; padding: 7px 12px; color: var(--muted); border-right: 1px solid var(--rule); }
.seg button:last-child { border-right: 0; }
.seg button[aria-pressed="true"] { background: var(--ink); color: #fff; }
.seg button:hover:not([aria-pressed="true"]) { color: var(--ink); background: var(--warm); }

.who { display: inline-flex; align-items: center; gap: 8px; min-width: 0; }
.who .nm { white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.logo { width: 18px; height: 18px; flex: none; display: inline-grid; place-items: center; }
.logo img { width: 18px; height: 18px; }
.tag { font-family: var(--mono); font-size: 10px; letter-spacing: .04em; color: var(--muted); border: 1px solid var(--rule); border-radius: 3px; padding: 0 4px; white-space: nowrap; }
.ok { color: var(--pass); } .no { color: var(--fail); }

pre { white-space: pre-wrap; font-family: var(--mono); font-size: 12.5px; line-height: 1.55; background: var(--warm); border: 1px solid var(--rule); border-radius: 6px; padding: 16px; max-height: 460px; overflow: auto; color: var(--body); }
details.doc { border-top: 1px solid var(--rule); }
details.doc:last-of-type { border-bottom: 1px solid var(--rule); }
details.doc summary { cursor: pointer; font-family: var(--mono); font-size: 13px; padding: 12px 0; }
.btn { display: inline-block; font-family: var(--mono); font-size: 13px; padding: 9px 14px; border: 1px solid var(--ink); border-radius: 4px; background: var(--ink); color: #fff; text-decoration: none; }
.btn.ghost { background: none; color: var(--ink); }
footer { padding: 24px var(--gutter) 36px; }
footer .wrap { display: flex; justify-content: space-between; flex-wrap: wrap; gap: 12px; }
@media (prefers-reduced-motion: reduce) { * { animation: none !important; transition: none !important; } html { scroll-behavior: auto; } }