:root {
  color-scheme: light dark;
  --blue: #007aff;
  --blue-soft: #e8f2ff;
  --ink: #111114;
  --muted: #62626a;
  --paper: #f5f5f7;
  --card: rgba(255, 255, 255, 0.86);
  --line: rgba(60, 60, 67, 0.14);
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  color: var(--ink);
  background:
    radial-gradient(circle at 80% -10%, rgba(0, 122, 255, 0.18), transparent 34rem),
    var(--paper);
  font: 16px/1.6 -apple-system, BlinkMacSystemFont, "SF Pro Text", "Segoe UI", sans-serif;
}

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

.wrap {
  width: min(1040px, calc(100% - 40px));
  margin-inline: auto;
}

nav {
  position: sticky;
  top: 0;
  z-index: 2;
  border-bottom: 1px solid var(--line);
  background: color-mix(in srgb, var(--paper) 82%, transparent);
  backdrop-filter: blur(18px);
}

.nav-inner {
  min-height: 64px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}

.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  color: var(--ink);
  font-weight: 800;
  text-decoration: none;
}

.mark {
  width: 34px;
  height: 34px;
  display: block;
  border-radius: 10px;
  box-shadow: 0 8px 24px rgba(0, 122, 255, 0.28);
}

.links { display: flex; gap: 18px; }
.links a { color: var(--muted); font-size: 14px; font-weight: 650; text-decoration: none; }
.links a:hover { color: var(--blue); }

main { padding: 72px 0 96px; }

.hero {
  max-width: 760px;
  padding: 48px 0 64px;
}

.eyebrow {
  margin: 0 0 12px;
  color: var(--blue);
  font-size: 13px;
  font-weight: 800;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

h1 {
  margin: 0;
  font-size: clamp(46px, 9vw, 86px);
  line-height: 0.98;
  letter-spacing: -0.055em;
}

.hero p {
  max-width: 660px;
  margin: 24px 0 0;
  color: var(--muted);
  font-size: clamp(18px, 3vw, 23px);
}

.button {
  display: inline-block;
  margin-top: 28px;
  padding: 12px 18px;
  color: white;
  border-radius: 12px;
  background: var(--blue);
  font-weight: 750;
  text-decoration: none;
}

.grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
}

.card, .document {
  border: 1px solid var(--line);
  border-radius: 22px;
  background: var(--card);
  box-shadow: 0 18px 50px rgba(0, 0, 0, 0.06);
}

.card { padding: 24px; }
.card h2 { margin: 0 0 8px; font-size: 21px; }
.card p { margin: 0; color: var(--muted); }

.document {
  max-width: 780px;
  padding: clamp(24px, 6vw, 56px);
}

.document h1 {
  font-size: clamp(38px, 7vw, 58px);
  margin-bottom: 12px;
}

.document h2 {
  margin: 38px 0 8px;
  font-size: 22px;
  letter-spacing: -0.02em;
}

.document p, .document li { color: var(--muted); }
.document strong { color: var(--ink); }
.updated { margin-top: 0; font-size: 14px; }

footer {
  padding: 28px 0 48px;
  border-top: 1px solid var(--line);
  color: var(--muted);
  font-size: 13px;
}

@media (max-width: 720px) {
  .links a:not(:last-child) { display: none; }
  main { padding-top: 36px; }
  .hero { padding-top: 30px; }
  .grid { grid-template-columns: 1fr; }
}

@media (prefers-color-scheme: dark) {
  :root {
    --ink: #f5f5f7;
    --muted: #aaaab2;
    --paper: #08080a;
    --card: rgba(28, 28, 30, 0.86);
    --line: rgba(255, 255, 255, 0.13);
    --blue-soft: #071e35;
  }
}