:root {
  --bg: #f7f7f4; --bg-soft: #efefea; --text: #12130f; --muted: #5b5d54;
  --line: #dcdcd4; --line-strong: #c6c7bd;
}
* { box-sizing: border-box; margin: 0; padding: 0; }
body {
  font-family: "Inter", "Segoe UI", system-ui, -apple-system, Roboto, Arial, sans-serif;
  background: var(--bg); color: var(--text); font-size: 17px; line-height: 1.7;
  -webkit-font-smoothing: antialiased;
}
a { color: inherit; text-decoration: none; }
.wrap { width: min(900px, calc(100% - 48px)); margin: 0 auto; }
.case-header { border-bottom: 1px solid var(--line); padding: 16px 0; position: sticky; top: 0; background: rgba(247,247,244,.9); backdrop-filter: blur(10px); z-index: 10; }
.case-header .wrap { display: flex; align-items: center; justify-content: space-between; gap: 16px; }
.back { font-size: 15px; color: var(--muted); }
.back:hover { color: var(--text); }
.lang { display: inline-flex; border: 1px solid var(--line-strong); border-radius: 8px; overflow: hidden; font-size: 11.5px; font-weight: 600; font-family: ui-monospace, Consolas, monospace; }
.lang button { padding: 5px 9px; color: var(--muted); border: 0; background: none; cursor: pointer; }
.lang button.active { background: var(--text); color: var(--bg); }
main { padding: 56px 0 72px; }
.eyebrow { font-family: ui-monospace, Consolas, monospace; font-size: 12.5px; letter-spacing: .08em; text-transform: uppercase; color: var(--muted); margin-bottom: 16px; }
h1 { font-size: clamp(30px, 4.6vw, 46px); line-height: 1.08; letter-spacing: -.04em; font-weight: 650; margin-bottom: 16px; }
.lede { font-size: 18px; color: #3a3c34; max-width: 760px; margin-bottom: 22px; }
.chips { display: flex; flex-wrap: wrap; gap: 6px; list-style: none; margin-bottom: 12px; }
.chips li { font-size: 13px; padding: 4px 10px; border: 1px solid var(--line); border-radius: 999px; background: #fff; color: #2c2e28; }
section { padding: 26px 0; border-top: 1px solid var(--line); }
h2 { font-size: 22px; letter-spacing: -.02em; font-weight: 600; margin-bottom: 12px; }
p { margin-bottom: 10px; color: #2c2e27; }
ul.list { margin: 0 0 4px 20px; color: #2c2e27; }
ul.list li { margin-bottom: 8px; }
.metrics { display: grid; grid-template-columns: repeat(3, 1fr); gap: 12px; margin-top: 8px; }
.metric { border: 1px solid var(--line); border-radius: 12px; background: #fff; padding: 14px 16px; }
.metric b { display: block; font-size: 24px; font-weight: 650; letter-spacing: -.03em; }
.metric span { font-size: 12.5px; color: var(--muted); }
.diagram { border: 1px solid var(--line); border-radius: 16px; background: #fff; padding: 20px; overflow-x: auto; margin-top: 8px; }
.diagram svg { display: block; width: 100%; height: auto; min-width: 560px; }
.dg-ext { fill: #ffffff; stroke: #dcdcd4; }
.dg-core { fill: #f1f3ff; stroke: #c9d2f5; }
.dg-data { fill: #f1f7ee; stroke: #c9dcc0; }
.dg-obs { fill: #fdf4ee; stroke: #e8d5c6; }
.dg-sub { font-family: "Inter", "Segoe UI", sans-serif; font-size: 10.5px; fill: #6b6d63; }
.dg-label { font-family: "Inter", "Segoe UI", sans-serif; font-size: 12.5px; font-weight: 600; fill: var(--text); }
.dg-arrow { stroke: #9a9c90; stroke-width: 1.4; fill: none; }
.pager { display: flex; justify-content: space-between; gap: 12px; padding-top: 30px; margin-top: 10px; border-top: 1px solid var(--line); font-size: 14px; }
.pager a { color: var(--muted); }
.pager a:hover { color: var(--text); }
footer { border-top: 1px solid var(--line); padding: 24px 0; color: var(--muted); font-size: 13px; }
footer .wrap { display: flex; justify-content: space-between; gap: 16px; flex-wrap: wrap; }
@media (max-width: 720px) {
  .metrics { grid-template-columns: 1fr; }
  .pager { flex-direction: column; }
  main { padding: 40px 0 56px; }
}