:root {
  --fg: #1d1d1f;
  --muted: #6e6e73;
  --faint: #86868b;
  --line: #d2d2d7;
  --bg: #ffffff;
}

* { box-sizing: border-box; margin: 0; padding: 0; }

html { -webkit-text-size-adjust: 100%; }

body {
  font-family: -apple-system, BlinkMacSystemFont, "SF Pro Display", "SF Pro Text",
               "Helvetica Neue", Helvetica, Arial, sans-serif;
  color: var(--fg);
  background: var(--bg);
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

a { color: var(--fg); text-decoration: none; }
a:hover { text-decoration: underline; }

/* Header */
header { border-bottom: 1px solid var(--line); }
header nav {
  max-width: 980px;
  margin: 0 auto;
  padding: 0 22px;
  height: 48px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 12px;
}
header .brand { font-weight: 600; letter-spacing: 0.08em; }
header .links a { margin-left: 24px; color: var(--muted); }
header .links a:hover { color: var(--fg); text-decoration: none; }

/* Home */
main.hero {
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: 96px 22px;
}
.hero h1 {
  font-size: clamp(44px, 9vw, 88px);
  font-weight: 600;
  letter-spacing: -0.03em;
  line-height: 1.05;
}
.hero p {
  margin-top: 18px;
  font-size: clamp(19px, 2.4vw, 24px);
  color: var(--muted);
  letter-spacing: -0.01em;
}
.hero .cta { margin-top: 36px; font-size: 17px; }
.hero .cta a { margin: 0 14px; }
.hero .cta a::after { content: " \203A"; }

/* Document pages */
main.doc {
  flex: 1;
  width: 100%;
  max-width: 692px;
  margin: 0 auto;
  padding: 64px 22px 88px;
}
.doc h1 {
  font-size: 40px;
  font-weight: 600;
  letter-spacing: -0.025em;
  line-height: 1.1;
}
.doc .updated { margin-top: 8px; color: var(--faint); font-size: 14px; }
.doc .lead { margin-top: 24px; font-size: 21px; color: var(--muted); line-height: 1.4; }
.doc h2 {
  margin-top: 44px;
  font-size: 21px;
  font-weight: 600;
  letter-spacing: -0.01em;
}
.doc p, .doc li { margin-top: 12px; font-size: 17px; }
.doc ul { padding-left: 22px; }
.doc li { margin-top: 6px; }
.doc a { text-decoration: underline; }
.doc dl { margin-top: 16px; font-size: 17px; }
.doc dt { margin-top: 14px; color: var(--muted); font-size: 14px; }
.doc dd { margin-top: 2px; }

/* Footer */
footer { border-top: 1px solid var(--line); font-size: 12px; color: var(--faint); }
footer .inner { max-width: 980px; margin: 0 auto; padding: 18px 22px 26px; }
footer .legal { line-height: 1.8; }
footer .links { margin-top: 10px; }
footer .links a { color: var(--muted); margin-right: 20px; }