:root {
  color-scheme: light;
  --brand: #004aad;
  --brand-dark: #00377f;
  --ink: #172033;
  --muted: #5e6878;
  --line: #dbe2eb;
  --surface: #f6f8fb;
  --white: #ffffff;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  color: var(--ink);
  background: var(--white);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  font-size: 16px;
  line-height: 1.65;
}

a { color: var(--brand); }
a:hover { color: var(--brand-dark); }

.site-header {
  background: var(--brand);
  color: var(--white);
}

.nav {
  width: min(1080px, calc(100% - 40px));
  min-height: 76px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  color: var(--white);
  font-size: 20px;
  font-weight: 700;
  text-decoration: none;
}

.brand img {
  width: 42px;
  height: 42px;
  border-radius: 6px;
}

.nav-links {
  display: flex;
  gap: 20px;
  flex-wrap: wrap;
}

.nav-links a {
  color: var(--white);
  font-size: 14px;
  font-weight: 600;
  text-decoration: none;
}

.intro {
  padding: 52px 0 42px;
  background: var(--surface);
  border-bottom: 1px solid var(--line);
}

.content {
  width: min(760px, calc(100% - 40px));
  margin: 0 auto;
}

main.content { padding: 44px 0 64px; }

h1, h2 { line-height: 1.25; }
h1 { margin: 0 0 12px; font-size: 36px; }
h2 { margin: 38px 0 10px; font-size: 22px; }
p, ul, ol { margin: 0 0 18px; }
li + li { margin-top: 8px; }
.lede { max-width: 650px; color: var(--muted); font-size: 18px; }
.updated { color: var(--muted); font-size: 14px; }

.link-list {
  border-top: 1px solid var(--line);
}

.link-list a {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 18px 0;
  border-bottom: 1px solid var(--line);
  color: var(--ink);
  font-weight: 650;
  text-decoration: none;
}

.action {
  display: inline-flex;
  min-height: 48px;
  padding: 11px 18px;
  align-items: center;
  justify-content: center;
  border-radius: 6px;
  background: var(--brand);
  color: var(--white);
  font-weight: 700;
  text-decoration: none;
}

.action:hover { background: var(--brand-dark); color: var(--white); }

.notice {
  margin: 28px 0;
  padding: 18px 20px;
  border-left: 4px solid var(--brand);
  background: var(--surface);
}

footer {
  padding: 26px 0;
  border-top: 1px solid var(--line);
  color: var(--muted);
  font-size: 14px;
}

@media (max-width: 680px) {
  .nav { padding: 14px 0; align-items: flex-start; flex-direction: column; }
  .nav-links { gap: 14px; }
  .intro { padding: 38px 0 30px; }
  main.content { padding: 32px 0 48px; }
  h1 { font-size: 30px; }
}