:root {
  color-scheme: light dark;
  --bg: #0e1726;
  --bg-soft: #12213a;
  --surface: rgba(255, 255, 255, 0.08);
  --surface-border: rgba(255, 255, 255, 0.14);
  --text: #edf3ff;
  --muted: #b8c6df;
  --accent: #5dc1ff;
  --accent-strong: #86ffcf;
  --shadow: 0 24px 60px rgba(0, 0, 0, 0.28);
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: "Segoe UI", "Inter", system-ui, sans-serif;
  background:
    radial-gradient(circle at top right, rgba(93, 193, 255, 0.22), transparent 28%),
    radial-gradient(circle at top left, rgba(134, 255, 207, 0.16), transparent 24%),
    linear-gradient(180deg, var(--bg) 0%, #0a1020 100%);
  color: var(--text);
  min-height: 100vh;
}

a {
  color: var(--accent);
}

.shell {
  width: min(980px, calc(100% - 32px));
  margin: 0 auto;
  padding: 48px 0 72px;
}

.hero,
.document section,
.page-header,
.card {
  background: var(--surface);
  border: 1px solid var(--surface-border);
  border-radius: 20px;
  box-shadow: var(--shadow);
  backdrop-filter: blur(18px);
}

.hero,
.page-header,
.document section {
  padding: 28px;
}

.eyebrow {
  margin: 0 0 10px;
  color: var(--accent-strong);
  text-transform: uppercase;
  letter-spacing: 0.16em;
  font-size: 0.74rem;
  font-weight: 700;
}

h1,
h2 {
  margin-top: 0;
}

.lede,
.meta,
.document p,
.document li {
  color: var(--muted);
  line-height: 1.7;
}

.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 18px;
  margin-top: 22px;
}

.card {
  display: block;
  padding: 24px;
  text-decoration: none;
  transition: transform 0.18s ease, border-color 0.18s ease;
}

.card:hover {
  transform: translateY(-3px);
  border-color: rgba(93, 193, 255, 0.45);
}

.top-nav {
  margin-bottom: 18px;
}

.document {
  display: grid;
  gap: 18px;
}

ul {
  padding-left: 20px;
}

@media (max-width: 640px) {
  .shell {
    width: min(100% - 24px, 980px);
    padding: 28px 0 48px;
  }

  .hero,
  .page-header,
  .document section,
  .card {
    padding: 22px;
  }
}