:root {
  --primary: #3a7ca5;
  --primary-dark: #2d6a8f;
  --navy: #1c3350;
  --off-white: #fafaf9;
  --slate-900: #1a2535;
  --gray-100: #eceef2;
  --gray-600: #4e5a6b;
  --font: -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

* { box-sizing: border-box; }
html { color-scheme: light; }
body {
  margin: 0;
  background: var(--off-white);
  color: var(--gray-600);
  font-family: var(--font);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
}

header {
  border-bottom: 1px solid var(--gray-100);
  background: #fff;
}

.header-inner,
main,
footer {
  width: min(100% - 40px, 780px);
  margin: 0 auto;
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 68px;
}

.brand {
  color: var(--slate-900);
  font-weight: 700;
  text-decoration: none;
}

.header-links { display: flex; gap: 18px; }
a { color: var(--primary-dark); }
.header-links a { font-size: 14px; font-weight: 600; text-decoration: none; }
a:hover { text-decoration: underline; }

main { padding: 64px 0 72px; }
h1, h2, h3 { color: var(--slate-900); line-height: 1.3; }
h1 { margin: 0; font-size: clamp(2rem, 6vw, 2.75rem); }
h2 { margin: 44px 0 12px; font-size: 1.35rem; }
h3 { margin: 26px 0 8px; font-size: 1rem; }
p, li { font-size: 15px; }
ul { padding-left: 24px; }
.updated { margin: 8px 0 36px; color: var(--gray-600); font-size: 14px; }
.notice {
  margin: 28px 0;
  padding: 18px 20px;
  border-left: 4px solid var(--primary);
  background: #f1f6f9;
  color: var(--slate-900);
}

footer {
  display: flex;
  gap: 16px;
  justify-content: space-between;
  padding: 28px 0 40px;
  border-top: 1px solid var(--gray-100);
  color: var(--gray-600);
  font-size: 13px;
}
footer nav { display: flex; gap: 16px; }
footer a { color: inherit; }

@media (max-width: 600px) {
  .header-inner { align-items: flex-start; flex-direction: column; justify-content: center; gap: 6px; padding: 12px 0; }
  main { padding-top: 44px; }
  footer { flex-direction: column; }
}