:root {
  --ink: #16202a;
  --muted: #536172;
  --paper: #f7f8fa;
  --panel: #ffffff;
  --line: #dbe2ea;
  --blue: #1e6ea7;
  --blue-dark: #124d78;
  --teal: #187a7a;
  --amber: #9a6200;
  --red: #a63f4b;
  --shadow: 0 8px 24px rgba(28, 43, 58, 0.09);
  --serif: "Noto Serif CJK SC", "Songti SC", Georgia, serif;
  --sans: "Noto Sans CJK SC", "Microsoft YaHei", -apple-system, BlinkMacSystemFont, "Segoe UI", Arial, sans-serif;
  --mono: "SFMono-Regular", Consolas, "Liberation Mono", monospace;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body { margin: 0; color: var(--ink); background: var(--paper); font-family: var(--sans); font-size: 17px; line-height: 1.75; }
a { color: var(--blue-dark); text-decoration-thickness: 1px; text-underline-offset: 0.16em; }
a:hover { color: var(--red); }
a:focus-visible, .skip-link:focus-visible { outline: 3px solid #d98c00; outline-offset: 3px; }
.shell { width: min(1120px, calc(100% - 40px)); margin: 0 auto; }
.narrow { width: min(800px, calc(100% - 40px)); margin: 0 auto; }
.hero { color: #f8fbff; background: radial-gradient(circle at 80% 10%, #2773a9 0, #143854 44%, #0b1e2d 100%); padding: 70px 0 64px; border-bottom: 5px solid #8fc4df; }
.eyebrow, .kicker { margin: 0 0 10px; font-size: 0.80rem; font-family: var(--mono); font-weight: 700; letter-spacing: 0.06em; text-transform: uppercase; }
.eyebrow { color: #b9d9ec; }
.kicker { color: var(--blue); }
h1, h2, h3 { font-family: var(--serif); line-height: 1.28; }
h1 { max-width: 920px; margin: 0; font-size: clamp(2rem, 5vw, 3.5rem); letter-spacing: -0.025em; }
h2 { margin: 0 0 18px; font-size: clamp(1.55rem, 3.3vw, 2.25rem); }
h3 { margin: 0 0 8px; font-size: 1.12rem; }
.subtitle { max-width: 850px; margin: 20px 0 0; font-size: clamp(1.08rem, 2.2vw, 1.32rem); line-height: 1.65; color: #dcebf4; }
.status { max-width: 860px; margin: 24px 0 0; padding: 14px 17px; background: rgba(255,255,255,.11); border-left: 4px solid #f5c663; color: #f6f9fb; }
.language-toggle { margin: 18px 0 0; font-size: .9rem; }
.language-toggle a { display: inline-block; padding: 7px 14px; border: 1px solid rgba(255,255,255,.4); border-radius: 4px; color: #f6f9fb; text-decoration: none; }
.language-toggle a:hover { background: rgba(255,255,255,.14); color: #fff; }
.language-toggle { margin: 18px 0 0; font-size: .92rem; }
.language-toggle a { color: #b9d9ec; text-decoration: none; border-bottom: 1px solid rgba(185,217,236,.5); padding-bottom: 2px; }
.language-toggle a:hover { color: #fff; border-bottom-color: #fff; }
section { padding: 70px 0; }
section:nth-child(even) { background: #eef2f6; }
.lead { padding-top: 78px; background: #fdfdfd; }
.lead-text { font-family: var(--serif); font-size: clamp(1.25rem, 2.9vw, 1.65rem); line-height: 1.6; }
.formula-card { margin-top: 28px; padding: 24px 28px; background: #e7f2f7; border-left: 5px solid var(--teal); box-shadow: var(--shadow); }
.metric-label { margin: 0; color: var(--teal); font-size: .82rem; font-weight: 800; letter-spacing: .07em; text-transform: uppercase; }
.formula { margin: 10px 0; font-family: var(--serif); font-size: clamp(1.35rem, 3vw, 2rem); color: #103e5c; }
.formula-card p:last-child { margin-bottom: 0; }
.two-up, .outcomes { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 22px; margin-top: 28px; }
.callout, .outcomes article { padding: 22px; background: var(--panel); border: 1px solid var(--line); box-shadow: var(--shadow); }
.callout p, .outcomes p { margin: 0; }
.emphasis { border-top: 4px solid var(--blue); }
.boundary { border-top: 4px solid var(--red); }
.figure-section { padding: 54px 0; background: #fff; }
figure { max-width: 1120px; margin: 0 auto; padding: 16px; background: #fff; border: 1px solid var(--line); box-shadow: var(--shadow); }
figure img { display: block; width: 100%; height: auto; border: 1px solid #edf1f5; }
figcaption { padding: 16px 8px 4px; color: #334254; font-size: .95rem; line-height: 1.65; }
.download { margin: 6px 8px 0; font-size: .88rem; }
.mono { font-family: var(--mono); font-size: .92em; overflow-wrap: anywhere; }
table { width: 100%; border-collapse: collapse; margin: 26px 0 8px; background: var(--panel); font-size: .94rem; line-height: 1.55; }
th, td { padding: 13px 14px; vertical-align: top; text-align: left; border: 1px solid var(--line); }
th { color: #fff; background: #244e6a; font-weight: 700; }
tbody tr:nth-child(even) { background: #f3f7fa; }
.note { padding: 14px 17px; border-left: 4px solid var(--amber); background: #fff5dd; color: #604008; }
.outcomes { grid-template-columns: repeat(3, minmax(0, 1fr)); }
.outcomes article:nth-child(1) { border-top: 4px solid var(--blue); }
.outcomes article:nth-child(2) { border-top: 4px solid var(--teal); }
.outcomes article:nth-child(3) { border-top: 4px solid var(--amber); }
.final { background: #123b59 !important; color: #eff7fb; }
.final .kicker { color: #a9d9ef; }
.final h2 { color: #fff; }
.provenance { padding-top: 54px; padding-bottom: 54px; }
.provenance ul { margin: 0; padding-left: 1.3em; }
.provenance li + li { margin-top: 12px; }
footer { padding: 26px 0; background: #0e283b; color: #d2e1eb; font-size: .88rem; }
footer p { margin: 0; }
.skip-link { position: absolute; top: -50px; left: 12px; z-index: 10; padding: 8px 12px; color: #fff; background: #000; }
.skip-link:focus { top: 12px; }

@media (max-width: 720px) {
  body { font-size: 16px; line-height: 1.7; }
  .shell, .narrow { width: min(100% - 28px, 800px); }
  .hero { padding: 48px 0 44px; }
  section { padding: 48px 0; }
  .lead { padding-top: 56px; }
  .two-up, .outcomes { grid-template-columns: 1fr; }
  .formula-card { padding: 18px; }
  figure { padding: 8px; }
  figcaption { padding: 12px 4px 2px; font-size: .90rem; }
  table { display: block; overflow-x: auto; max-width: 100%; font-size: .87rem; }
  th, td { min-width: 150px; padding: 10px; }
}