:root {
  color-scheme: light;
  --ink: #162536;
  --muted: #5b6b7d;
  --line: #d8e1e9;
  --surface: #ffffff;
  --surface-soft: #f4f7fa;
  --surface-blue: #edf5fb;
  --accent: #1469a5;
  --accent-deep: #0d456f;
  --good: #087743;
  --good-bg: #e8f6ef;
  --active: #8a5a00;
  --active-bg: #fff7df;
  --proposed: #a64b05;
  --proposed-bg: #fff0e5;
  --bad: #a51f2e;
  --bad-bg: #fff0f1;
  --questioned: #684b91;
  --questioned-bg: #f2edfb;
  --shadow: 0 10px 35px rgba(22, 37, 54, .08);
}
* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  color: var(--ink);
  background: #f7f9fb;
  font: 16px/1.65 system-ui, -apple-system, "Segoe UI", "Noto Sans CJK SC", "Microsoft YaHei", sans-serif;
}
a { color: var(--accent); }
a:hover { text-decoration-thickness: 2px; }
code {
  font-size: .92em;
  background: var(--surface-soft);
  border: 1px solid #e4eaf0;
  border-radius: .25rem;
  padding: .05em .3em;
}
.site-header {
  background: linear-gradient(125deg, #12283d, #18557f 68%, #287ca7);
  color: #fff;
  padding: 1.2rem clamp(1rem, 4vw, 3rem);
}
.site-header-inner { max-width: 1440px; margin: 0 auto; display: flex; align-items: center; justify-content: space-between; gap: 1rem; }
.brand { display: flex; align-items: baseline; gap: .75rem; }
.brand strong { font-size: 1.15rem; letter-spacing: .02em; }
.brand span { color: #c9e5f4; font-size: .9rem; }
.header-meta { color: #c9e5f4; font-size: .86rem; }
.page-shell { max-width: 1440px; margin: 0 auto; display: grid; grid-template-columns: 225px minmax(0, 1fr); gap: 2rem; padding: 1.6rem clamp(1rem, 4vw, 3rem) 3rem; }
.toc { position: sticky; top: 1rem; align-self: start; max-height: calc(100vh - 2rem); overflow: auto; }
.toc-title { color: var(--muted); text-transform: uppercase; letter-spacing: .12em; font-size: .72rem; font-weight: 750; margin: .3rem 0 .55rem; }
.toc nav { border-left: 2px solid var(--line); padding-left: .75rem; }
.toc a { display: block; color: #41556a; text-decoration: none; font-size: .89rem; padding: .22rem 0; }
.toc a:hover { color: var(--accent); }
.toc a.toc-sub { padding-left: .75rem; font-size: .82rem; color: var(--muted); }
.content { min-width: 0; }
.hero { background: var(--surface); border: 1px solid var(--line); border-radius: .9rem; box-shadow: var(--shadow); padding: clamp(1.1rem, 2vw, 2rem); margin-bottom: 1.4rem; }
.hero-kicker { color: var(--accent); font-size: .77rem; font-weight: 800; letter-spacing: .14em; text-transform: uppercase; margin: 0 0 .35rem; }
.hero h1 { font-size: clamp(1.9rem, 4vw, 3rem); line-height: 1.15; margin: 0 0 1rem; }
.hero-grid { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: .9rem; align-items: stretch; }
.hero-card { min-width: 0; border: 1px solid var(--line); border-radius: .65rem; padding: 1rem 1.1rem; background: linear-gradient(180deg, #fff, #fbfcfd); }
.hero-card h2 { font-size: 1.08rem; line-height: 1.25; margin: 0 0 .65rem; color: var(--accent-deep); }
.hero-card p, .hero-card ul { margin-top: .45rem; margin-bottom: .45rem; }
.hero-card ul { padding-left: 1.2rem; }
.hero-card.why { background: var(--surface-blue); border-color: #bfd8e9; }
.section, .glossary-section, .claims-section { background: var(--surface); border: 1px solid var(--line); border-radius: .9rem; padding: clamp(1rem, 2.4vw, 2rem); margin-bottom: 1.4rem; box-shadow: 0 4px 18px rgba(22, 37, 54, .035); }
.section-marker { color: var(--accent); font-size: .73rem; font-weight: 800; letter-spacing: .14em; text-transform: uppercase; margin-bottom: .2rem; }
.section h2, .glossary-section h2, .claims-section h2 { font-size: clamp(1.45rem, 2.5vw, 2rem); line-height: 1.25; margin: 0 0 1rem; }
.section h3, .glossary-section h3 { font-size: 1.18rem; margin: 1.55rem 0 .45rem; color: #28455e; }
p { max-width: 90ch; margin: .75rem 0; }
ul, ol { max-width: 90ch; }
blockquote { margin: 1rem 0; padding: .75rem 1rem; border-left: 3px solid #b7c5d0; color: #526372; background: #fafcfd; }
.intuition-callout { margin: 1rem 0 .7rem; padding: .9rem 1rem .95rem; border: 1px solid #b9d6e8; border-left: 5px solid var(--accent); border-radius: .35rem; background: var(--surface-blue); color: #24475f; }
.intuition-callout p { margin: 0; }
.callout-label { display: inline-block; color: var(--accent-deep); font-size: .76rem; font-weight: 800; letter-spacing: .08em; margin-right: .45rem; }
.precise-definition { margin-top: .5rem; }
.claim-ref { display: inline-block; color: var(--accent-deep); background: #eaf4fb; border: 1px solid #c8e0ef; border-radius: .25rem; padding: 0 .24em; font: inherit; font-size: .89em; text-decoration: none; white-space: nowrap; }
.claim-ref:hover { background: #d8edf8; }
.figure { margin: 1.2rem 0 1.35rem; padding: .8rem; background: #fbfcfd; border: 1px solid var(--line); border-radius: .55rem; }
.figure img { display: block; width: min(100%, 900px); height: auto; margin: 0 auto; }
.figure figcaption { border-top: 1px solid var(--line); margin-top: .75rem; padding: .7rem .25rem .1rem; color: #465a6c; font-size: .93rem; }
.glossary-section h3 { border-bottom: 1px solid var(--line); padding-bottom: .3rem; }
.claims-intro { padding: .85rem 1rem; background: var(--surface-soft); border-left: 4px solid var(--accent); margin-bottom: 1rem; }
.claims-warning { padding: .85rem 1rem; background: var(--bad-bg); border: 1px solid #f0b9bf; border-left: 5px solid var(--bad); border-radius: .35rem; margin: 1rem 0; }
.table-wrap { overflow-x: auto; border: 1px solid var(--line); border-radius: .5rem; }
table { width: 100%; min-width: 920px; border-collapse: collapse; font-size: .91rem; }
th, td { text-align: left; vertical-align: top; padding: .65rem .7rem; border-bottom: 1px solid var(--line); }
thead th { color: #314a60; background: var(--surface-soft); font-size: .8rem; letter-spacing: .04em; }
tbody tr:last-child td { border-bottom: 0; }
td.claim-id { white-space: nowrap; font-weight: 650; color: var(--accent-deep); }
td.claim-statement { min-width: 22rem; }
.badge { display: inline-flex; align-items: center; gap: .25rem; border-radius: 99px; padding: .16rem .55rem; font-size: .78rem; font-weight: 750; white-space: nowrap; }
.badge-validated { color: var(--good); background: var(--good-bg); }
.badge-active { color: var(--active); background: var(--active-bg); }
.badge-proposed { color: var(--proposed); background: var(--proposed-bg); }
.badge-unsourced { color: var(--bad); background: var(--bad-bg); }
.badge-questioned { color: var(--questioned); background: var(--questioned-bg); }
.status-unsourced { background: #fff8f8; }
.status-unsourced td { border-bottom-color: #f1d4d7; }
.stale-note { color: var(--bad); font-size: .86em; display: block; margin-top: .18rem; }
.site-footer { max-width: 1440px; margin: 0 auto; border-top: 1px solid var(--line); padding: 1rem clamp(1rem, 4vw, 3rem) 2rem; color: var(--muted); font-size: .85rem; }
.sr-only { position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px; overflow: hidden; clip: rect(0, 0, 0, 0); white-space: nowrap; border: 0; }
@media (max-width: 980px) {
  .page-shell { grid-template-columns: 1fr; }
  .toc { position: static; max-height: none; background: var(--surface); border: 1px solid var(--line); border-radius: .65rem; padding: .8rem 1rem; }
  .toc nav { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); column-gap: 1rem; }
}
@media (max-width: 680px) {
  body { font-size: 15px; }
  .site-header-inner { display: block; }
  .header-meta { margin-top: .2rem; }
  .hero-grid { grid-template-columns: 1fr; }
  .hero-card { padding: .9rem; }
  .section, .glossary-section, .claims-section { border-radius: .65rem; padding: 1rem; }
  .toc nav { display: block; }
  .toc a.toc-sub { padding-left: .45rem; }
  .figure { padding: .45rem; }
}