:root {
  --navy: #1C2541;
  --navy-light: #3A506B;
  --navy-dark: #0B132B;
  --surface: #F0F4F8;
  --text: #1C2541;
  --muted: #5B6B82;
  --accent: #2F6FED;
  --border: #D9E0EA;
  --max: 960px;
}
* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  font-size: 17px;
  line-height: 1.6;
  color: var(--text);
  background: #fff;
}
a { color: var(--accent); }
.wrap { max-width: var(--max); margin: 0 auto; padding: 0 24px; }

header.site {
  background: var(--navy-dark);
  color: #fff;
}
header.site .wrap {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 64px;
}
.brand {
  color: #fff;
  text-decoration: none;
  font-weight: 700;
  letter-spacing: 0.2px;
  white-space: nowrap;
  display: flex;
  align-items: center;
  gap: 10px;
}
.brand .mark {
  width: 28px; height: 28px; border-radius: 7px;
  background: var(--accent);
  display: inline-flex; align-items: center; justify-content: center;
  font-size: 15px; font-weight: 800;
}
nav.top a {
  color: #C9D3E0;
  text-decoration: none;
  margin-left: 22px;
  font-size: 15px;
}
nav.top a:hover { color: #fff; }

.hero {
  background: linear-gradient(180deg, var(--navy-dark) 0%, var(--navy) 100%);
  color: #fff;
  padding: 72px 0 80px;
}
.hero h1 {
  font-size: clamp(32px, 5vw, 48px);
  line-height: 1.15;
  margin: 0 0 16px;
  max-width: 640px;
}
.hero p.lead {
  font-size: 20px;
  color: #C9D3E0;
  max-width: 600px;
  margin: 0 0 28px;
}
.hero .cta {
  display: inline-block;
  background: #fff;
  color: var(--navy);
  font-weight: 600;
  text-decoration: none;
  padding: 12px 22px;
  border-radius: 10px;
}
.hero .note { font-size: 14px; color: #A9B6C7; margin-top: 16px; }

section.features { padding: 64px 0; }
section.features h2 { font-size: 28px; margin: 0 0 8px; }
section.features p.sub { color: var(--muted); margin: 0 0 32px; }
.grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 20px;
}
.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 22px;
}
.card h3 { margin: 0 0 8px; font-size: 18px; }
.card p { margin: 0; color: var(--muted); font-size: 16px; }

section.access {
  background: var(--surface);
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
  padding: 56px 0;
}
section.access h2 { font-size: 26px; margin: 0 0 12px; }
section.access p { max-width: 680px; margin: 0 0 12px; }

main.doc { padding: 48px 0 72px; }
main.doc h1 { font-size: 36px; margin: 0 0 6px; }
main.doc .meta { color: var(--muted); margin: 0 0 32px; font-size: 15px; }
main.doc h2 { font-size: 22px; margin: 36px 0 10px; }
main.doc h3 { font-size: 18px; margin: 24px 0 8px; }
main.doc p, main.doc li { max-width: 760px; }
main.doc ul { padding-left: 22px; }
main.doc li { margin-bottom: 6px; }
.callout {
  background: var(--surface);
  border-left: 4px solid var(--accent);
  padding: 14px 18px;
  border-radius: 8px;
  max-width: 760px;
}

footer.site {
  background: var(--navy-dark);
  color: #A9B6C7;
  padding: 32px 0;
  font-size: 14px;
}
footer.site .wrap {
  display: flex;
  flex-wrap: wrap;
  gap: 12px 28px;
  justify-content: space-between;
  align-items: center;
}
footer.site a { color: #C9D3E0; text-decoration: none; margin-right: 18px; }
footer.site a:hover { color: #fff; }

@media (max-width: 600px) {
  nav.top a { margin-left: 12px; font-size: 13px; }
  nav.top { white-space: nowrap; }
  .hero { padding: 48px 0 56px; }
}