:root {
  color-scheme: dark;
  --bg: #05090d;
  --panel: #0d151d;
  --panel-strong: #111d27;
  --ink: #eef7fb;
  --muted: #a0b3bf;
  --line: rgba(183, 221, 239, .16);
  --accent: #69d9c0;
  --accent-blue: #75bfff;
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  min-height: 100vh;
  color: var(--ink);
  background:
    radial-gradient(circle at 15% 5%, rgba(30, 102, 144, .22), transparent 30rem),
    radial-gradient(circle at 85% 18%, rgba(48, 142, 120, .13), transparent 28rem),
    var(--bg);
  line-height: 1.7;
}

a { color: var(--accent); text-underline-offset: .18em; }
a:hover { color: #a6f4e2; }
.content-header,
.content-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  padding: 18px max(22px, calc((100vw - 1080px) / 2));
  border-color: var(--line);
  background: rgba(6, 12, 17, .88);
  backdrop-filter: blur(18px);
}
.content-header { position: sticky; top: 0; z-index: 10; border-bottom: 1px solid var(--line); }
.content-footer { margin-top: 80px; border-top: 1px solid var(--line); color: var(--muted); font-size: .88rem; }
.content-brand { color: var(--ink); font-weight: 800; letter-spacing: -.02em; text-decoration: none; }
.content-brand span { color: var(--accent); }
.content-nav { display: flex; flex-wrap: wrap; justify-content: flex-end; gap: 10px 18px; font-size: .84rem; }
.content-nav a { color: var(--muted); text-decoration: none; }
.content-nav a[aria-current="page"], .content-nav a:hover { color: var(--ink); }
.content-shell { width: min(1080px, calc(100% - 44px)); margin: 0 auto; }
.breadcrumbs { margin: 30px 0 0; color: var(--muted); font-size: .82rem; }
.breadcrumbs a { color: var(--muted); }
.hero { padding: 70px 0 44px; border-bottom: 1px solid var(--line); }
.eyebrow { margin: 0 0 14px; color: var(--accent); font: 700 .78rem/1.3 ui-monospace, monospace; letter-spacing: .12em; text-transform: uppercase; }
h1 { max-width: 17ch; margin: 0; font-size: clamp(2.5rem, 7vw, 5.8rem); line-height: .98; letter-spacing: -.055em; }
.lede { max-width: 72ch; margin: 26px 0 0; color: #c8d8e1; font-size: clamp(1.05rem, 2.2vw, 1.28rem); }
.hero-actions { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 30px; }
.button { display: inline-flex; align-items: center; min-height: 46px; padding: 10px 18px; border: 1px solid var(--line); border-radius: 8px; color: var(--ink); background: var(--panel); font-weight: 700; text-decoration: none; }
.button.primary { color: #04110e; border-color: var(--accent); background: var(--accent); }
.content-grid { display: grid; grid-template-columns: minmax(0, 1fr) 280px; gap: 64px; padding-top: 52px; }
.article { min-width: 0; }
.article h2 { margin: 50px 0 14px; font-size: clamp(1.55rem, 3vw, 2.25rem); line-height: 1.15; letter-spacing: -.025em; }
.article h2:first-child { margin-top: 0; }
.article h3 { margin: 30px 0 8px; font-size: 1.15rem; }
.article p, .article li { color: #c6d5de; }
.article strong { color: var(--ink); }
.article ul, .article ol { padding-left: 1.3rem; }
.fact-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 14px; margin: 28px 0; }
.fact-card, .callout { border: 1px solid var(--line); border-radius: 12px; background: linear-gradient(145deg, rgba(18, 31, 41, .92), rgba(8, 15, 21, .9)); }
.fact-card { padding: 20px; }
.fact-card strong { display: block; color: var(--accent-blue); font-size: 1.4rem; }
.fact-card span { color: var(--muted); font-size: .88rem; }
.callout { margin: 34px 0; padding: 24px; }
.callout h2, .callout h3 { margin-top: 0; }
.sidebar { align-self: start; position: sticky; top: 92px; padding: 22px; border: 1px solid var(--line); border-radius: 12px; background: rgba(11, 20, 27, .82); }
.sidebar h2 { margin: 0 0 12px; font-size: .82rem; color: var(--muted); letter-spacing: .1em; text-transform: uppercase; }
.sidebar ul { display: grid; gap: 9px; margin: 0; padding: 0; list-style: none; }
.sidebar a { text-decoration: none; }
.related { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 14px; margin-top: 58px; }
.related a { min-height: 130px; padding: 20px; border: 1px solid var(--line); border-radius: 12px; background: var(--panel); color: var(--ink); font-weight: 750; text-decoration: none; }
.related a span { display: block; margin-top: 8px; color: var(--muted); font-size: .84rem; font-weight: 400; }

@media (max-width: 780px) {
  .content-header { position: static; align-items: flex-start; }
  .content-nav { display: none; }
  .hero { padding-top: 48px; }
  .content-grid { grid-template-columns: 1fr; gap: 36px; }
  .sidebar { position: static; }
  .fact-grid, .related { grid-template-columns: 1fr; }
  .content-footer { align-items: flex-start; flex-direction: column; }
}