/* ACBL Knowledge Base — mobile-first, accessible (WCAG AA), no build step. */
:root {
  --acbl: #0b4f8a;
  --acbl-dark: #08375f;
  --acbl-bright: #1a72c4;
  --ink: #14212e;
  --ink-soft: #43566a;
  --muted: #6b7c8f;
  --line: #dbe3ec;
  --bg: #f5f7fa;
  --surface: #ffffff;
  --surface-2: #eef3f8;
  --accent: #b8860b;
  --focus: #1a72c4;
  --maxw: 1120px;
  --radius: 12px;
  --shadow: 0 1px 2px rgba(16,42,67,.06), 0 4px 16px rgba(16,42,67,.06);
  --sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
}
* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0; font-family: var(--sans); font-size: 16px; line-height: 1.6;
  color: var(--ink); background: var(--bg); overflow-wrap: break-word;
}
a { color: var(--acbl-bright); text-decoration: none; }
a:hover { text-decoration: underline; }
:focus-visible { outline: 3px solid var(--focus); outline-offset: 2px; border-radius: 4px; }
img { max-width: 100%; height: auto; }
h1, h2, h3, h4 { line-height: 1.25; color: var(--ink); }

.visually-hidden, .skip {
  position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px;
  overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; border: 0;
}
.skip:focus {
  position: fixed; top: 8px; left: 8px; width: auto; height: auto; clip: auto;
  background: var(--surface); color: var(--ink); padding: 10px 14px;
  border-radius: 8px; box-shadow: var(--shadow); z-index: 100;
}

/* ---- header ---- */
header.site { background: var(--acbl); color: #fff; position: sticky; top: 0; z-index: 50; box-shadow: var(--shadow); }
.bar { max-width: var(--maxw); margin: 0 auto; display: flex; align-items: center; gap: 12px; padding: 12px 18px; flex-wrap: wrap; }
.brand { color: #fff; font-weight: 700; font-size: 19px; letter-spacing: .2px; display: inline-flex; gap: 7px; align-items: baseline; }
.brand:hover { text-decoration: none; }
.brand-acbl { background: #fff; color: var(--acbl); padding: 2px 8px; border-radius: 6px; font-weight: 800; }
.brand-kb { font-weight: 600; opacity: .96; }
.mainnav { display: flex; gap: 4px; margin-left: auto; flex-wrap: wrap; }
.mainnav a { color: #eaf2fb; padding: 7px 11px; border-radius: 8px; font-size: 14.5px; white-space: nowrap; }
.mainnav a:hover { background: rgba(255,255,255,.14); text-decoration: none; }
.mainnav a[aria-current="page"] { background: rgba(255,255,255,.22); color: #fff; font-weight: 600; }
.nav-browse { border: 1px solid rgba(255,255,255,.4); }
.navtoggle, .navtoggle-btn { display: none; }

.search { max-width: var(--maxw); margin: 0 auto; padding: 0 18px 14px; display: flex; gap: 8px; position: relative; }
.search input {
  flex: 1; padding: 11px 14px; border: 1px solid transparent; border-radius: 10px;
  font-size: 16px; background: #fff; color: var(--ink); box-shadow: var(--shadow);
}
.search button {
  padding: 11px 18px; border: 0; border-radius: 10px; background: var(--acbl-dark);
  color: #fff; font-weight: 600; font-size: 15px; cursor: pointer;
}
.search button:hover { background: #06283f; }
.suggest {
  position: absolute; top: 100%; left: 18px; right: 18px; background: #fff; color: var(--ink);
  border: 1px solid var(--line); border-radius: 10px; box-shadow: var(--shadow); z-index: 60;
  margin-top: -6px; overflow: hidden;
}
.suggest a { display: block; padding: 10px 14px; color: var(--ink); border-bottom: 1px solid var(--line); }
.suggest a:last-child { border-bottom: 0; }
.suggest a:hover, .suggest a.active { background: var(--surface-2); text-decoration: none; }
.suggest .s-title { font-weight: 600; }
.suggest .s-sec { font-size: 12.5px; color: var(--muted); }

/* ---- page frame ---- */
.page { max-width: var(--maxw); margin: 0 auto; padding: 20px 18px 60px; }
.crumbs { font-size: 13.5px; color: var(--muted); margin: 4px 0 14px; }
.crumbs ol { list-style: none; display: flex; flex-wrap: wrap; gap: 6px; padding: 0; margin: 0; }
.crumbs li + li::before { content: "›"; margin-right: 6px; color: var(--line); }
.crumbs a { color: var(--ink-soft); }

.layout { display: block; }
.layout.has-aside { display: grid; grid-template-columns: minmax(0,1fr); gap: 34px; }
.content { min-width: 0; }

/* ---- hero / headings ---- */
.hero { padding: 26px 0 10px; }
.hero h1 { font-size: clamp(28px, 5vw, 42px); margin: 0 0 10px; }
.lede { font-size: 18px; color: var(--ink-soft); margin: 0 0 18px; max-width: 62ch; }
.hero-search { display: flex; gap: 8px; max-width: 620px; }
.hero-search input { flex: 1; padding: 13px 16px; border: 1px solid var(--line); border-radius: 10px; font-size: 16px; box-shadow: var(--shadow); }
.hero-search button { padding: 13px 22px; border: 0; border-radius: 10px; background: var(--acbl); color: #fff; font-weight: 600; cursor: pointer; }
.hero-search button:hover { background: var(--acbl-dark); }
.page-head { margin: 4px 0 22px; }
.page-head h1 { font-size: clamp(26px, 4.4vw, 36px); margin: 0 0 8px; }
h2 { font-size: 22px; margin: 32px 0 14px; }

/* ---- cards / grid ---- */
.grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(250px, 1fr)); gap: 16px; }
.doclist { display: grid; grid-template-columns: repeat(auto-fill, minmax(280px, 1fr)); gap: 14px; }
.card {
  display: block; background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius);
  padding: 18px 18px 16px; box-shadow: var(--shadow); transition: transform .08s ease, border-color .08s ease;
}
.card:hover { text-decoration: none; border-color: var(--acbl-bright); transform: translateY(-2px); }
.card h3 { margin: 0 0 6px; font-size: 17px; color: var(--acbl); }
.card p { margin: 0; color: var(--ink-soft); font-size: 14.5px; }
.card-meta { margin-top: 10px !important; font-size: 12.5px !important; color: var(--muted) !important; font-weight: 600; }

/* ---- chips / tags / pills ---- */
.chips { list-style: none; padding: 0; margin: 8px 0 0; display: flex; flex-wrap: wrap; gap: 9px; }
.chips.big .chip { font-size: 15.5px; padding: 10px 16px; }
.chip { display: inline-flex; align-items: center; gap: 8px; background: var(--surface); border: 1px solid var(--line); border-radius: 999px; padding: 7px 13px; color: var(--ink); font-size: 14px; }
.chip:hover { border-color: var(--acbl-bright); text-decoration: none; }
.chip-n { background: var(--surface-2); color: var(--ink-soft); border-radius: 999px; padding: 1px 8px; font-size: 12.5px; font-weight: 600; }
.tags { list-style: none; padding: 0; margin: 12px 0 0; display: flex; flex-wrap: wrap; gap: 7px; }
.tag { display: inline-block; background: var(--surface-2); color: var(--acbl-dark); border-radius: 999px; padding: 3px 11px; font-size: 12.5px; font-weight: 600; }
.tag:hover { background: #e0eaf5; text-decoration: none; }
.pill { display: inline-block; background: var(--surface-2); color: var(--acbl-dark); border-radius: 6px; padding: 2px 10px; font-size: 13px; font-weight: 600; }
.pill-versioned { background: #fbf1d8; color: #7a5a05; }
.version-meta { margin: 12px 0 0; display: flex; align-items: center; gap: 10px; }
.version-meta .kind { font-size: 12.5px; color: var(--muted); text-transform: uppercase; letter-spacing: .04em; }

/* ---- article prose ---- */
.article-head { border-bottom: 1px solid var(--line); padding-bottom: 18px; margin-bottom: 8px; }
.article-head h1 { font-size: clamp(25px, 4.2vw, 34px); margin: 0 0 8px; }
.prose { font-size: 16.5px; }
.prose h2 { font-size: 22px; margin: 30px 0 12px; padding-top: 6px; }
.prose h3 { font-size: 18px; margin: 22px 0 8px; }
.prose p { margin: 0 0 14px; }
.prose ul, .prose ol { margin: 0 0 16px; padding-left: 24px; }
.prose li { margin: 4px 0; }
.prose a { text-decoration: underline; text-underline-offset: 2px; }
.prose table { border-collapse: collapse; width: 100%; margin: 8px 0 20px; font-size: 14.5px; display: block; overflow-x: auto; }
.prose th, .prose td { border: 1px solid var(--line); padding: 8px 11px; text-align: left; vertical-align: top; }
.prose th { background: var(--surface-2); font-weight: 700; }
.prose tbody tr:nth-child(even) { background: #fafcfe; }
.prose blockquote { margin: 0 0 16px; padding: 4px 16px; border-left: 4px solid var(--acbl-bright); background: var(--surface-2); color: var(--ink-soft); border-radius: 0 8px 8px 0; }
.prose code { background: var(--surface-2); padding: 1px 6px; border-radius: 5px; font-size: .9em; }
.prose pre { background: #0d2233; color: #e7eef6; padding: 14px 16px; border-radius: 10px; overflow-x: auto; }
.prose pre code { background: none; padding: 0; color: inherit; }
.prose hr { border: 0; border-top: 1px solid var(--line); margin: 26px 0; }
.prose h2, .prose h3, .prose h4 { scroll-margin-top: 150px; position: relative; }
.secnum { color: var(--accent); font-weight: 700; margin-right: 4px; }
.anchor-link { opacity: 0; margin-left: 8px; color: var(--muted); font-weight: 400; text-decoration: none; font-size: .8em; }
.prose h2:hover .anchor-link, .prose h3:hover .anchor-link, .anchor-link:focus { opacity: 1; }

/* ---- banners ---- */
.banner { border-radius: 10px; padding: 12px 16px; margin: 16px 0; font-size: 15px; }
.banner a { font-weight: 600; }
.banner.historical { background: #fbf1d8; border: 1px solid #ecd9a4; color: #6f5205; }
.banner.authoritative { background: #e7f0fa; border: 1px solid #c5dcf1; color: var(--acbl-dark); }

/* ---- article footer ---- */
.article-foot { margin-top: 34px; border-top: 1px solid var(--line); padding-top: 16px; }
.provenance { display: flex; flex-wrap: wrap; gap: 26px; margin: 0 0 8px; }
.provenance div { margin: 0; }
.provenance dt { font-size: 12px; text-transform: uppercase; letter-spacing: .05em; color: var(--muted); }
.provenance dd { margin: 2px 0 0; font-weight: 600; }
.small { font-size: 13px; }
.muted { color: var(--muted); }

/* ---- rail (aside) ---- */
.rail { min-width: 0; }
.rail-box { background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius); padding: 14px 16px; margin-bottom: 16px; box-shadow: var(--shadow); }
.rail-box h2 { font-size: 13px; text-transform: uppercase; letter-spacing: .05em; color: var(--muted); margin: 0 0 10px; }
.rail-box ul { list-style: none; padding: 0; margin: 0; }
.onthispage li { margin: 5px 0; font-size: 14px; }
.onthispage li.lvl3 { padding-left: 14px; font-size: 13.5px; }
.onthispage .secnum { font-size: .9em; }
.versions .asof { display: flex; flex-wrap: wrap; gap: 6px; align-items: center; margin-bottom: 12px; font-size: 13px; }
.versions .asof label { flex-basis: 100%; color: var(--ink-soft); }
.versions .asof input { flex: 1; padding: 7px 9px; border: 1px solid var(--line); border-radius: 8px; font-size: 14px; min-width: 0; }
.versions .asof button { padding: 7px 13px; border: 0; border-radius: 8px; background: var(--acbl); color: #fff; font-weight: 600; cursor: pointer; }
.versions li { margin: 4px 0; }
.versions li a { display: block; padding: 8px 10px; border-radius: 8px; color: var(--ink); border: 1px solid transparent; }
.versions li a:hover { background: var(--surface-2); text-decoration: none; }
.versions li[aria-current="true"] a { border-color: var(--acbl-bright); background: var(--surface-2); }
.versions .vdate { font-weight: 600; }
.versions .badge { display: inline-block; margin-left: 8px; background: #d8f0dd; color: #1c6b34; border-radius: 999px; padding: 0 8px; font-size: 11.5px; font-weight: 700; }
.versions .vsum { display: block; font-size: 12.5px; color: var(--muted); }
.related li { margin: 6px 0; font-size: 14.5px; }

/* ---- search results ---- */
.search.inline { max-width: 620px; margin: 0; padding: 0; }
.search.inline input { border: 1px solid var(--line); box-shadow: none; }
.result-count { color: var(--muted); font-size: 14px; }
.results { list-style: none; padding: 0; margin: 12px 0 0; }
.results li { padding: 16px 0; border-bottom: 1px solid var(--line); }
.res-title { font-size: 18px; font-weight: 600; }
.res-section { margin-left: 10px; font-size: 12.5px; color: var(--muted); background: var(--surface-2); padding: 2px 9px; border-radius: 999px; }
.res-summary { margin: 6px 0 0; color: var(--ink-soft); font-size: 14.5px; }
.aud-section { margin-bottom: 26px; }
.aud-section h2 a { color: var(--ink); }

.empty { background: var(--surface); border: 1px dashed var(--line); border-radius: var(--radius); padding: 22px; color: var(--ink-soft); }
.btn { display: inline-block; background: var(--acbl); color: #fff; padding: 11px 18px; border-radius: 10px; font-weight: 600; }
.btn:hover { background: var(--acbl-dark); text-decoration: none; }

/* ---- footer ---- */
.site-footer { background: var(--acbl-dark); color: #cfe0f0; margin-top: 40px; }
.foot-inner { max-width: var(--maxw); margin: 0 auto; padding: 26px 18px; }
.foot-inner p { margin: 0 0 8px; font-size: 14px; }
.foot-inner strong { color: #fff; }
.foot-links a { color: #cfe0f0; }
.foot-links { opacity: .9; }

/* ---- responsive: sidebar on wide screens, hamburger on narrow ---- */
@media (min-width: 900px) {
  .layout.has-aside { grid-template-columns: minmax(0,1fr) 280px; }
  .rail { position: sticky; top: 150px; align-self: start; }
}
@media (max-width: 720px) {
  .navtoggle-btn {
    display: inline-flex; margin-left: auto; width: 42px; height: 38px; align-items: center; justify-content: center;
    background: rgba(255,255,255,.14); border-radius: 8px; cursor: pointer;
  }
  .navtoggle-btn span, .navtoggle-btn span::before, .navtoggle-btn span::after {
    content: ""; display: block; width: 20px; height: 2px; background: #fff; position: relative;
  }
  .navtoggle-btn span::before { position: absolute; top: -6px; }
  .navtoggle-btn span::after { position: absolute; top: 6px; }
  .mainnav { display: none; flex-basis: 100%; flex-direction: column; margin-left: 0; gap: 2px; }
  .navtoggle:checked ~ .mainnav { display: flex; }
  .mainnav a { padding: 10px 12px; }
}

/* ---- dark mode ---- */
@media (prefers-color-scheme: dark) {
  :root {
    --ink: #e7eef6; --ink-soft: #b3c2d1; --muted: #8397a9;
    --line: #26374a; --bg: #0c1620; --surface: #12202d; --surface-2: #1a2c3c;
    --acbl-bright: #5aa6e8; --shadow: 0 1px 2px rgba(0,0,0,.3), 0 4px 16px rgba(0,0,0,.3);
  }
  .brand-acbl { background: #e7eef6; }
  .search input { background: #12202d; color: var(--ink); }
  .banner.historical { background: #3a2f14; border-color: #5c4a1c; color: #f0dca0; }
  .banner.authoritative { background: #142a3f; border-color: #244a6b; color: #bcd7f2; }
  .prose pre { background: #05131f; }
  .tag, .pill { background: var(--surface-2); color: #bcd7f2; }
}