:root {
  color-scheme: light dark;
  --background: #f7f8fa;
  --surface: #ffffff;
  --text: #172033;
  --muted: #5f6b7a;
  --border: #e4e8ef;
  --accent: #3867ff;
  --accent-soft: #eaf0ff;
}

@media (prefers-color-scheme: dark) {
  :root {
    --background: #11151d;
    --surface: #1a202b;
    --text: #f1f4f9;
    --muted: #aab5c4;
    --border: #303846;
    --accent: #9eb4ff;
    --accent-soft: #252f4a;
  }
}

* { box-sizing: border-box; }

body {
  margin: 0;
  background: var(--background);
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, "SF Pro Text", "Helvetica Neue", Arial, sans-serif;
  line-height: 1.7;
}

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

.site-header,
.site-footer,
.page {
  width: min(920px, calc(100% - 40px));
  margin: 0 auto;
}

.site-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  padding: 28px 0 20px;
}

.brand {
  color: var(--text);
  font-size: 1.1rem;
  font-weight: 750;
  text-decoration: none;
  letter-spacing: .02em;
}

nav { display: flex; flex-wrap: wrap; gap: 16px; }
nav a { font-size: .92rem; text-decoration: none; }

.hero { padding: 60px 0 36px; }

.eyebrow {
  color: var(--accent);
  font-size: .82rem;
  font-weight: 700;
  letter-spacing: .12em;
  text-transform: uppercase;
}

h1, h2, h3 { line-height: 1.25; }
h1 { max-width: 720px; margin: 12px 0 20px; font-size: clamp(2.1rem, 6vw, 4rem); letter-spacing: -.04em; }
h2 { margin-top: 2.2em; font-size: 1.35rem; }
h3 { margin-top: 1.8em; font-size: 1.05rem; }
p, li { max-width: 760px; }

.lead { color: var(--muted); font-size: 1.15rem; max-width: 680px; }

.cards {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 16px;
  margin: 22px 0 80px;
}

.card {
  display: block;
  padding: 22px;
  border: 1px solid var(--border);
  border-radius: 16px;
  background: var(--surface);
  color: var(--text);
  text-decoration: none;
}

.card:hover { border-color: var(--accent); }
.card h2 { margin: 0 0 8px; font-size: 1.05rem; }
.card p { margin: 0; color: var(--muted); font-size: .95rem; }

.document {
  margin: 32px 0 80px;
  padding: 44px clamp(24px, 6vw, 64px);
  border: 1px solid var(--border);
  border-radius: 20px;
  background: var(--surface);
}

.document h1 { font-size: clamp(2rem, 5vw, 3rem); }
.document .meta { color: var(--muted); font-size: .92rem; }
.document li { margin: 7px 0; }
.callout { margin: 24px 0; padding: 16px 18px; border-left: 4px solid var(--accent); background: var(--accent-soft); }

.site-footer {
  display: flex;
  justify-content: space-between;
  gap: 16px;
  padding: 24px 0 42px;
  border-top: 1px solid var(--border);
  color: var(--muted);
  font-size: .9rem;
}

.site-footer nav { gap: 12px; }

@media (max-width: 680px) {
  .site-header { align-items: flex-start; flex-direction: column; }
  .hero { padding-top: 34px; }
  .cards { grid-template-columns: 1fr; margin-bottom: 48px; }
  .document { padding: 28px 20px; }
  .site-footer { align-items: flex-start; flex-direction: column; }
}