:root {
  color-scheme: light;
  --paper: #f4efe5;
  --surface: #fffaf0;
  --ink: #2c2824;
  --muted: #6f665d;
  --rule: #d8cdbd;
  --accent: #8f3d2f;
  --accent-soft: #ead7cf;
  --positive: #54705a;
  --negative: #9a4338;
  --focus: #315b78;
  --serif: "Source Han Serif SC", "Noto Serif CJK SC", Georgia, serif;
  --sans: Inter, "Noto Sans CJK SC", "Microsoft YaHei", system-ui, sans-serif;
  --space: 8px;
}
[data-theme="dark"] { color-scheme: dark; --paper: #1d1a17; --surface: #26211d; --ink: #eee5d7; --muted: #b9ad9f; --rule: #4b4239; --accent: #d0806e; --accent-soft: #4a2b25; --positive: #91b098; --negative: #e18b79; --focus: #8ec5e6; }
* { box-sizing: border-box; }
html { background: var(--paper); color: var(--ink); scroll-behavior: smooth; }
body { margin: 0; background: var(--paper); color: var(--ink); font-family: var(--sans); font-size: 16px; line-height: 1.75; }
a { color: inherit; }
a:focus-visible, button:focus-visible { outline: 2px solid var(--focus); outline-offset: 2px; }
.container { width: min(1200px, calc(100% - 96px)); margin-inline: auto; }
.skip-link { position: absolute; left: 16px; top: -80px; z-index: 2; background: var(--surface); padding: 8px 12px; }
.skip-link:focus { top: 16px; }
.site-header { min-height: 88px; border-bottom: 1px solid var(--rule); display: flex; align-items: center; gap: 40px; }
.brand { font-family: var(--serif); font-size: 22px; text-decoration: none; white-space: nowrap; }
nav { display: flex; gap: 24px; flex: 1; }
nav a, .language-link { text-decoration: none; color: var(--muted); }
nav a:hover, nav a[aria-current="page"], .language-link:hover { color: var(--accent); }
nav a[aria-current="page"] { text-decoration: underline; text-underline-offset: 5px; }
.header-tools { display: flex; align-items: center; gap: 16px; }
.theme-toggle { border: 1px solid var(--rule); background: transparent; color: var(--ink); width: 44px; height: 44px; cursor: pointer; font-size: 20px; }
.page-shell { min-height: 70vh; }
.section { padding-block: 80px; border-bottom: 1px solid var(--rule); }
.section-kicker { color: var(--accent); font-size: 12px; letter-spacing: .08em; text-transform: uppercase; }
h1, h2, h3 { font-family: var(--serif); font-weight: 500; line-height: 1.2; margin: 0 0 20px; }
h1 { font-size: clamp(34px, 4vw, 48px); max-width: 780px; }
h2 { font-size: clamp(26px, 3vw, 32px); }
p { max-width: 68ch; color: var(--muted); }
.lede { font-size: 18px; max-width: 56ch; }
.status-grid { display: grid; grid-template-columns: minmax(0, 1.6fr) minmax(300px, 1fr); gap: 64px; align-items: start; margin-top: 32px; }
.status-facts, .metric-list { margin: 0; display: grid; grid-template-columns: 1fr 1fr; border-top: 1px solid var(--rule); }
.status-facts div, .metric-list div { padding: 16px 0; border-bottom: 1px solid var(--rule); }
dt { color: var(--muted); font-size: 13px; }
dd { margin: 3px 0 0; }
.status-value { color: var(--positive); }
.section-heading-row { display: flex; justify-content: space-between; align-items: end; gap: 32px; margin-top: 20px; }
.section-heading-row p { margin-bottom: 0; }
.text-link { color: var(--accent); text-underline-offset: 4px; white-space: nowrap; }
.inline-facts { display: flex; flex-wrap: wrap; gap: 24px; margin-top: 28px; color: var(--muted); font-size: 14px; }
.inline-facts b { color: var(--ink); font-weight: 500; margin-right: 6px; }
.freshness { color: var(--positive); }
.chart-frame { min-height: 280px; margin-top: 28px; border-top: 1px solid var(--rule); border-bottom: 1px solid var(--rule); background: var(--surface); }
.chart-svg { display: block; width: 100%; height: 280px; }
.chart-legend { display: flex; justify-content: center; flex-wrap: wrap; gap: 24px; margin-top: 12px; color: var(--muted); font-size: 14px; }
.legend-line { display: inline-block; width: 28px; border-top: 2px solid; margin: 0 8px 4px 0; }
.strategy-line { border-color: var(--accent); }
.benchmark-line { border-color: var(--muted); }
.table-fallback { margin-top: 20px; color: var(--muted); }
table { width: 100%; border-collapse: collapse; text-align: left; }
th, td { padding: 12px 10px; border-bottom: 1px solid var(--rule); }
th { color: var(--muted); font-size: 13px; font-weight: 500; }
.metric-list { max-width: 720px; }
.metric-list dd { font-size: 22px; font-family: var(--serif); }
.method-layout { display: grid; grid-template-columns: 220px minmax(0, 720px); gap: 64px; padding-block: 64px; }
.chapter-rail { display: flex; flex-direction: column; gap: 14px; position: sticky; top: 24px; align-self: start; }
.chapter-rail a { color: var(--muted); text-decoration: none; }
.chapter-rail a:hover { color: var(--accent); }
.long-read section + section { margin-top: 56px; }
.disclosure-block { border-top: 2px solid var(--accent); }
.archive-table-section { overflow-x: auto; }
.empty-note { padding-block: 64px; }
.site-footer { display: flex; justify-content: space-between; gap: 24px; padding-block: 32px; font-size: 13px; }
.site-footer p { margin: 0; }
.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: 720px) { .container { width: min(100% - 40px, 600px); } .site-header { min-height: auto; padding-block: 20px; flex-wrap: wrap; gap: 16px 24px; } nav { order: 3; flex-basis: 100%; gap: 18px; overflow-x: auto; } .header-tools { margin-left: auto; } .section { padding-block: 56px; } .status-grid, .method-layout { grid-template-columns: 1fr; gap: 32px; } .chapter-rail { position: static; flex-direction: row; flex-wrap: wrap; border-bottom: 1px solid var(--rule); padding-bottom: 16px; } .section-heading-row { display: block; } .section-heading-row .text-link { display: inline-block; margin-top: 20px; } .site-footer { display: block; } .site-footer p + p { margin-top: 12px; } }
@media (prefers-reduced-motion: reduce) { *, *::before, *::after { scroll-behavior: auto !important; transition: none !important; } }