:root {
  --bg: #f7f8fa;
  --surface: #ffffff;
  --ink: #182433;
  --muted: #536071;
  --line: #dbe4ef;
  --soft: #edf5ff;
  --blue: #096bd8;
  --blue-hover: #0559b8;
  --orange: #ef6b3d;
  --navy: #142b49;
}

*, *::before, *::after { box-sizing: border-box; }

html { -webkit-text-size-adjust: 100%; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font: 400 17.5px/1.68 system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  text-rendering: optimizeLegibility;
}

a { color: var(--blue); text-underline-offset: 2px; }
a:hover { color: var(--blue-hover); }
a:focus-visible, .button:focus-visible { outline: 2px solid var(--blue); outline-offset: 3px; border-radius: 4px; }

.skip-link { position: absolute; left: -9999px; top: 0; }
.skip-link:focus { left: 1rem; top: 1rem; z-index: 20; background: var(--surface); color: var(--ink); padding: .5rem .8rem; border-radius: 10px; border: 1px solid var(--line); }

.site-header {
  position: sticky;
  top: 0;
  z-index: 10;
  background: rgba(247, 248, 250, .9);
  -webkit-backdrop-filter: saturate(1.4) blur(10px);
  backdrop-filter: saturate(1.4) blur(10px);
  border-bottom: 1px solid var(--line);
}
.header-inner {
  max-width: 1040px;
  margin: 0 auto;
  padding: .7rem 1.25rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: .6rem 1.25rem;
  flex-wrap: wrap;
}
.brand { color: var(--ink); text-decoration: none; font-weight: 700; font-size: 1.02rem; letter-spacing: -.005em; }
.site-nav ul { list-style: none; margin: 0; padding: 0; display: flex; flex-wrap: wrap; align-items: center; gap: .35rem 1.1rem; }
.site-nav a { color: var(--muted); text-decoration: none; font-weight: 600; font-size: .94rem; }
.site-nav a:hover { color: var(--ink); }
.site-nav a[aria-current="page"] { color: var(--ink); }
.site-nav a.nav-cta { color: #fff; background: var(--blue); padding: .42rem .85rem; border-radius: 10px; }
.site-nav a.nav-cta:hover { background: var(--blue-hover); color: #fff; }

main { max-width: 760px; margin: 0 auto; padding: 2.75rem 1.25rem 3.5rem; }

h1 {
  font-size: clamp(2rem, 4.6vw, 2.8rem);
  line-height: 1.14;
  letter-spacing: -.015em;
  font-weight: 700;
  margin: 0 0 .6rem;
}
.updated { color: var(--muted); font-size: .9rem; margin: 0 0 1.6rem; }
article > p.lede { font-size: 1.14rem; line-height: 1.62; }

h2 {
  font-size: clamp(1.45rem, 3vw, 1.85rem);
  line-height: 1.24;
  letter-spacing: -.01em;
  font-weight: 650;
  margin: 2.6rem 0 .8rem;
}
h3 { font-size: 1.14rem; line-height: 1.35; font-weight: 650; margin: 1.8rem 0 .45rem; }

p { margin: 0 0 1.05rem; }
ul, ol { margin: 0 0 1.15rem; padding-left: 1.3rem; }
li { margin: .4rem 0; }
li::marker { color: var(--muted); }
strong { font-weight: 650; }

blockquote {
  margin: 1.4rem 0;
  padding: .2rem 0 .2rem 1.1rem;
  border-left: 3px solid var(--line);
  color: var(--muted);
}

.table-wrap {
  margin: 1.4rem 0 1.6rem;
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 16px;
  overflow: hidden;
}
table { width: 100%; border-collapse: collapse; font-size: .95rem; line-height: 1.5; }
th, td { text-align: left; vertical-align: top; padding: .75rem .9rem; border-bottom: 1px solid var(--line); }
th { background: var(--soft); font-weight: 650; }
tbody tr:last-child td { border-bottom: 0; }

.pick {
  margin: 2.8rem 0;
  padding: 1.6rem 1.6rem .6rem;
  background: var(--surface);
  border: 1px solid var(--line);
  border-top: 4px solid var(--orange);
  border-radius: 20px;
  box-shadow: 0 10px 30px rgba(20, 43, 73, .06);
}
.pick h2 { margin-top: 0; }

.note {
  margin: 1.6rem 0;
  padding: 1rem 1.25rem .2rem;
  background: var(--soft);
  border-radius: 16px;
}

.cta-row { margin: 1.3rem 0 1.5rem; }
.button {
  display: inline-block;
  background: var(--blue);
  color: #fff;
  text-decoration: none;
  font-weight: 600;
  font-size: 1rem;
  padding: .78rem 1.15rem;
  border-radius: 10px;
}
.button:hover { background: var(--blue-hover); color: #fff; }

.faq h3 { margin-top: 1.5rem; }

.site-footer { border-top: 1px solid var(--line); background: var(--surface); }
.footer-inner {
  max-width: 1040px;
  margin: 0 auto;
  padding: 1.6rem 1.25rem 2rem;
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: .6rem 1.5rem;
  color: var(--muted);
  font-size: .92rem;
}
.footer-inner p { margin: 0; }
.footer-inner ul { list-style: none; margin: 0; padding: 0; display: flex; flex-wrap: wrap; gap: .4rem 1.1rem; }
.footer-inner a { color: var(--muted); }
.footer-inner a:hover { color: var(--ink); }

@media (max-width: 640px) {
  body { font-size: 16.5px; }
  .header-inner { padding: .6rem 1rem; }
  .site-nav ul { gap: .3rem .85rem; }
  main { padding: 1.9rem 1rem 2.75rem; }
  .pick { padding: 1.25rem 1.1rem .4rem; border-radius: 18px; }
  .table-wrap { border-radius: 14px; }
  table, thead, tbody, tr, th, td { display: block; width: 100%; }
  thead { position: absolute; left: -9999px; }
  tr { border-bottom: 1px solid var(--line); padding: .45rem 0; }
  tbody tr:last-child { border-bottom: 0; }
  td { border: 0; padding: .3rem .9rem; }
  td::before { content: attr(data-label); display: block; font-weight: 650; font-size: .82rem; color: var(--muted); }
}

/* Reference-site parts (page standard 2a) */
.brand-block { display: flex; flex-direction: column; gap: .05rem; }
.brand-sub { color: var(--muted); font-size: .84rem; font-weight: 500; }
.chain { color: var(--muted); font-size: .95rem; margin: 0 0 1.2rem; }
.box-title { font-size: 1rem; line-height: 1.3; font-weight: 700; margin: 0 0 .55rem; letter-spacing: 0; }
.answer {
  margin: 0 0 1.4rem;
  padding: 1.15rem 1.3rem .35rem;
  background: var(--surface);
  border: 1px solid var(--line);
  border-left: 4px solid var(--blue);
  border-radius: 16px;
}
.answer p.lede { font-size: 1.1rem; }
.toc {
  margin: 0 0 2rem;
  padding: 1rem 1.3rem .4rem;
  background: var(--soft);
  border-radius: 16px;
}
.toc ol { margin: 0 0 .6rem; padding-left: 1.2rem; columns: 2; column-gap: 2rem; }
.toc ul { margin: 0 0 .6rem; padding-left: 0; list-style: none; columns: 2; column-gap: 2rem; }
.toc li { margin: .25rem 0; break-inside: avoid; }
.toc a { text-decoration: none; }
.toc a:hover { text-decoration: underline; }
.cta-block { margin: 1.3rem 0 1.4rem; }
.cta-block .cta-row { display: flex; flex-wrap: wrap; align-items: center; gap: .6rem 1.2rem; margin: 0 0 .6rem; }
.text-link { font-weight: 600; }
.cta-note { color: var(--muted); font-size: .94rem; margin: 0; }
.plain-list { list-style: none; padding-left: 0; }
.plain-list li { margin: .55rem 0; }
.dir-links { display: inline-block; font-size: .94rem; }
.muted { color: var(--muted); font-size: .92rem; }
.directory, .sources, .continue, .connect, .cite { margin-top: 2.4rem; }
.sources h2, .continue h2, .connect h2, .cite h2 { font-size: 1.3rem; }
.entity-card {
  margin: 1.1rem 0 0;
  padding: 1rem 1.2rem;
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 14px;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
  gap: .7rem 1.2rem;
  font-size: .94rem;
}
.entity-card dt { color: var(--muted); font-size: .8rem; font-weight: 600; }
.entity-card dd { margin: 0; font-weight: 600; }
.cite-line { font-size: .94rem; color: var(--muted); overflow-wrap: anywhere; }
@media (max-width: 640px) {
  .toc ol, .toc ul { columns: 1; }
  .brand-sub { font-size: .8rem; }
}