:root {
  --article-ink: #07111f;
  --article-muted: #58708e;
  --article-line: #d9e4f0;
  --article-bg: #f4f8fc;
  --article-card: #ffffff;
  --article-red: #ef3f46;
  --article-blue: #173a66;
  --article-green: #11a83c;
  --article-font: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Microsoft YaHei", "Noto Sans SC", Arial, sans-serif;
}
* { box-sizing: border-box; }
html, body { margin: 0; max-width: 100%; overflow-x: hidden; font-family: var(--article-font); color: var(--article-ink); background: var(--article-bg); letter-spacing: 0; }
a { color: inherit; text-decoration: none; }
.site-header, .site-footer { background: #fff; }
.site-header { border-bottom: 1px solid var(--article-line); }
.site-footer { border-top: 1px solid var(--article-line); }
.nav, .footer-inner { width: min(1120px, calc(100% - 40px)); margin: 0 auto; display: flex; align-items: center; justify-content: space-between; gap: 28px; }
.nav { min-height: 96px; }
.logo img { width: 190px; height: auto; display: block; }
.nav-links { display: flex; align-items: center; gap: 34px; font-size: 15px; }
.nav-links a:hover { color: var(--article-red); }
.article-wrap { width: min(980px, calc(100% - 40px)); margin: 0 auto; padding: 64px 0 80px; }
.eyebrow { display: inline-flex; padding: 9px 16px; border-radius: 999px; background: var(--article-ink); color: #fff; font-size: 14px; font-weight: 800; }
h1 { margin: 22px 0 16px; font-size: clamp(36px, 6vw, 66px); line-height: 1.08; font-weight: 950; }
.lead { max-width: 840px; margin: 0 0 28px; color: var(--article-muted); font-size: 19px; line-height: 1.9; }
.meta { display: flex; flex-wrap: wrap; gap: 12px; margin-bottom: 36px; color: var(--article-muted); font-size: 14px; }
.hero-card { overflow: hidden; border: 1px solid var(--article-line); border-radius: 8px; background: var(--article-card); box-shadow: 0 18px 48px rgba(23, 58, 102, .08); }
.hero-card img { width: 100%; aspect-ratio: 49 / 20; object-fit: cover; object-position: center; display: block; }
.hero-note { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 1px; background: var(--article-line); }
.hero-note span { padding: 18px; background: #fff; color: var(--article-blue); font-weight: 800; text-align: center; }
.content { display: grid; gap: 22px; margin-top: 42px; }
.section { padding: clamp(24px, 4vw, 36px); border: 1px solid var(--article-line); border-radius: 8px; background: #fff; }
.section h2 { margin: 0 0 16px; font-size: 28px; line-height: 1.25; }
.section p, .section li { color: #24384f; font-size: 17px; line-height: 1.95; }
.section p { margin: 0 0 14px; }
.section ul, .section ol { margin: 0; padding-left: 22px; }
.section li + li { margin-top: 8px; }
.article-figure { margin: 24px 0 22px; overflow: hidden; border: 1px solid var(--article-line); border-radius: 8px; background: #eef3f8; }
.article-figure img { width: 100%; height: auto; max-height: 620px; object-fit: contain; display: block; background: #111820; }
.article-figure figcaption { padding: 14px 18px; border-top: 1px solid var(--article-line); background: #fff; color: var(--article-muted); font-size: 14px; line-height: 1.7; }
.analysis-flow { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 10px; margin: 22px 0; }
.analysis-flow span { position: relative; min-height: 84px; padding: 16px 14px; border: 1px solid var(--article-line); border-radius: 6px; background: #f8fbff; color: var(--article-blue); font-size: 15px; font-weight: 800; line-height: 1.55; }
.analysis-flow b { display: block; margin-bottom: 5px; color: var(--article-red); font-size: 12px; }
.study-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 12px; margin-top: 18px; }
.study-grid span { padding: 16px; border: 1px solid var(--article-line); border-radius: 6px; background: #f8fbff; color: var(--article-blue); font-weight: 800; }
.link-row { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 20px; }
.pill-link { display: inline-flex; align-items: center; justify-content: center; min-height: 44px; padding: 0 18px; border: 1px solid var(--article-line); border-radius: 999px; background: #f8fbff; color: var(--article-blue); font-weight: 800; }
.pill-link.primary { border-color: var(--article-red); background: var(--article-red); color: #fff; }
.article-editorial .content { display: block; margin-top: 48px; }
.article-editorial .section { padding: 42px 0; border: 0; border-top: 1px solid var(--article-line); border-radius: 0; background: transparent; }
.article-editorial .section:first-child { border-top: 0; }
.article-editorial .section h2 { max-width: 760px; font-size: clamp(25px, 4vw, 34px); line-height: 1.28; }
.article-editorial .section p { max-width: 820px; }
.article-editorial .opening-line { max-width: 850px; color: var(--article-ink); font-size: clamp(22px, 3.2vw, 29px); font-weight: 850; line-height: 1.55; }
.article-pullquote { max-width: 850px; margin: 28px 0 4px; padding: 24px 28px; border-left: 4px solid var(--article-red); background: #fff; color: var(--article-blue); font-size: 21px; font-weight: 800; line-height: 1.7; }
.article-editorial .article-figure { max-width: 880px; }
.article-sources { display: flex; flex-wrap: wrap; gap: 10px 20px; padding: 30px 0; border-top: 1px solid var(--article-line); color: var(--article-muted); font-size: 14px; line-height: 1.7; }
.article-sources strong { flex: 0 0 100%; color: var(--article-ink); font-size: 15px; }
.article-sources a { color: var(--article-blue); text-decoration: underline; text-decoration-color: rgba(23, 58, 102, .35); text-underline-offset: 4px; }
.article-field-notes .article-experiment { margin: 18px 0; padding: 34px; border: 1px solid var(--article-line); border-radius: 8px; background: #fff; }
.article-field-notes .article-caution { padding-left: 28px; border-left: 4px solid var(--article-red); }
.verdict-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 14px; margin-top: 22px; }
.verdict-grid article { padding: 24px; border: 1px solid var(--article-line); border-radius: 8px; background: #fff; }
.verdict-grid span { color: var(--article-red); font-size: 14px; font-weight: 850; }
.verdict-grid strong { display: block; margin: 10px 0 12px; color: var(--article-ink); font-size: 20px; line-height: 1.5; }
.verdict-grid p { margin: 0; font-size: 15px; line-height: 1.75; }
.verdict-note { margin-top: 22px; }
.section-myths dl { max-width: 820px; margin: 0; }
.section-myths dt { margin-top: 26px; color: var(--article-ink); font-size: 20px; font-weight: 850; }
.section-myths dt:first-child { margin-top: 0; }
.section-myths dd { margin: 8px 0 0; color: #24384f; font-size: 17px; line-height: 1.9; }
.hand-ledger { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 1px; margin: 28px 0; overflow: hidden; border: 1px solid var(--article-line); border-radius: 8px; background: var(--article-line); }
.hand-ledger span { min-height: 104px; padding: 20px; background: #fff; color: #24384f; font-size: 14px; line-height: 1.65; }
.hand-ledger b { display: block; margin-bottom: 8px; color: var(--article-red); font-size: 13px; }
.street-kicker { display: block; margin-bottom: 10px; color: var(--article-red); font-size: 14px; font-weight: 850; }
.article-hand-story .street-section { position: relative; padding-left: 42px; }
.article-hand-story .street-section::before { position: absolute; top: 47px; bottom: 47px; left: 10px; width: 2px; background: var(--article-line); content: ""; }
.article-hand-story .street-section::after { position: absolute; top: 49px; left: 5px; width: 12px; height: 12px; border-radius: 50%; background: var(--article-red); content: ""; }
.river-math { max-width: 820px; margin-top: 26px; padding: 24px 26px; border: 1px solid var(--article-line); border-radius: 8px; background: #fff; }
.river-math strong { display: block; margin-bottom: 8px; color: var(--article-blue); font-size: 22px; }
.river-math span { color: #24384f; font-size: 15px; line-height: 1.75; }
.diagnostic-brief { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 1px; margin: 28px 0; overflow: hidden; border: 1px solid var(--article-line); border-radius: 8px; background: var(--article-line); }
.diagnostic-brief span { padding: 20px; background: #fff; color: #24384f; font-size: 14px; line-height: 1.65; }
.diagnostic-brief b { display: block; margin-bottom: 8px; color: var(--article-red); font-size: 13px; }
.stage-label { display: block; margin-bottom: 10px; color: var(--article-red); font-size: 14px; font-weight: 850; }
.article-data-diagnostic .diagnostic-stage { position: relative; }
.diagnostic-path { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 10px; margin: 26px 0; }
.diagnostic-path span { padding: 18px; border-top: 3px solid var(--article-red); background: #fff; color: #24384f; font-size: 14px; line-height: 1.65; }
.diagnostic-path b { display: block; margin-bottom: 7px; color: var(--article-blue); }
.diagnostic-outcomes { max-width: 850px; margin: 24px 0; border-top: 1px solid var(--article-line); }
.diagnostic-outcomes article { display: grid; grid-template-columns: 170px 1fr; gap: 24px; padding: 22px 0; border-bottom: 1px solid var(--article-line); }
.diagnostic-outcomes strong { color: var(--article-ink); font-size: 18px; }
.diagnostic-outcomes p { margin: 0; }
.qa-rule-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 1px; max-width: 850px; margin: 28px 0; overflow: hidden; border: 1px solid var(--article-line); border-radius: 8px; background: var(--article-line); }
.qa-rule-grid span { padding: 22px; background: #fff; color: #24384f; font-size: 15px; line-height: 1.75; }
.qa-rule-grid b { display: block; margin-bottom: 7px; color: var(--article-red); font-size: 14px; }
.qa-number { display: block; margin-bottom: 10px; color: var(--article-red); font-size: 14px; font-weight: 850; }
.qa-hand-case { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); max-width: 880px; margin: 26px 0; border-top: 1px solid var(--article-line); }
.qa-hand-case > div { padding: 22px 0; border-bottom: 1px solid var(--article-line); }
.qa-hand-case > div:nth-child(even) { padding-right: 22px; }
.qa-hand-case > div:nth-child(odd):not(.qa-board) { padding-left: 22px; border-left: 1px solid var(--article-line); }
.qa-hand-case .qa-board { grid-column: 1 / -1; display: flex; align-items: baseline; justify-content: space-between; gap: 24px; }
.qa-hand-case b { display: block; color: var(--article-blue); font-size: 14px; }
.qa-hand-case span { color: var(--article-ink); font-size: clamp(20px, 4vw, 28px); font-weight: 850; }
.qa-hand-case p { margin: 10px 0 0; font-size: 15px; line-height: 1.75; }
.qa-checklist { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 12px; max-width: 880px; margin: 24px 0; }
.qa-checklist span { padding: 20px; border-top: 3px solid var(--article-red); background: #fff; color: #24384f; font-size: 15px; line-height: 1.65; }
.qa-checklist b { display: block; margin-bottom: 7px; color: var(--article-blue); font-size: 18px; }
.footer-inner { min-height: 136px; }
.footer-inner img { width: 170px; height: auto; display: block; }
.contact { display: flex; flex-wrap: wrap; gap: 14px 26px; color: #1b2a3f; font-size: 15px; }
.contact a, .contact span { display: inline-flex; align-items: center; gap: 8px; }
.contact svg { width: 18px; height: 18px; stroke: var(--article-green); fill: none; stroke-width: 2; }
@media (max-width: 760px) {
  .nav { min-height: 84px; align-items: flex-start; flex-direction: column; padding: 18px 0; }
  .logo img { width: 165px; }
  .nav-links { width: 100%; gap: 14px; overflow-x: auto; padding-bottom: 4px; font-size: 13px; white-space: nowrap; scrollbar-width: none; }
  .nav-links::-webkit-scrollbar { display: none; }
  .nav-links a { flex: 0 0 auto; }
  .article-wrap { width: min(100% - 28px, 980px); padding: 38px 0 56px; }
  .lead { font-size: 17px; }
  .hero-note, .study-grid, .analysis-flow { grid-template-columns: 1fr; }
  .article-figure { margin: 20px 0; }
  .article-figure figcaption { padding: 12px 14px; }
  .article-editorial .content { margin-top: 34px; }
  .article-editorial .section { padding: 32px 0; }
  .article-pullquote { padding: 20px; font-size: 18px; }
  .article-field-notes .article-experiment { padding: 22px; }
  .verdict-grid { grid-template-columns: 1fr; }
  .hand-ledger { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .hand-ledger span { min-height: 92px; padding: 16px; }
  .article-hand-story .street-section { padding-left: 28px; }
  .article-hand-story .street-section::before { left: 5px; }
  .article-hand-story .street-section::after { left: 0; }
  .diagnostic-brief, .diagnostic-path, .qa-rule-grid, .qa-checklist { grid-template-columns: 1fr; }
  .diagnostic-outcomes article { grid-template-columns: 1fr; gap: 8px; }
  .qa-hand-case { grid-template-columns: 1fr; }
  .qa-hand-case .qa-board { grid-column: auto; align-items: flex-start; flex-direction: column; gap: 8px; }
  .qa-hand-case > div:nth-child(even), .qa-hand-case > div:nth-child(odd):not(.qa-board) { padding-right: 0; padding-left: 0; border-left: 0; }
  .footer-inner { width: min(100% - 28px, 1120px); align-items: flex-start; flex-direction: column; padding: 26px 0; }
  .contact { flex-direction: column; }
}