:root {
  color: #10213b;
  background: #f5f7fa;
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  font-synthesis: none;
}

* { box-sizing: border-box; }
body { margin: 0; line-height: 1.65; }
a { color: #1e4db7; }
.topbar { padding: 10px 24px; text-align: center; background: #fff0c2; border-bottom: 1px solid #d6a733; color: #5b4300; font-weight: 750; }
header { display: flex; align-items: center; justify-content: space-between; gap: 24px; padding: 22px max(24px, calc((100vw - 980px) / 2)); background: #071426; color: white; }
.brand { color: white; font-size: 1.55rem; font-weight: 850; letter-spacing: -.05em; text-decoration: none; }
.brand span { color: #d7ae51; }
header nav { display: flex; flex-wrap: wrap; gap: 18px; }
header nav a { color: #d7e1ef; text-decoration: none; }
main { width: min(900px, calc(100% - 36px)); margin: 44px auto 80px; padding: clamp(24px, 5vw, 56px); background: white; border: 1px solid #dfe5ed; border-radius: 8px; box-shadow: 0 14px 40px rgba(10, 22, 40, .06); }
h1 { margin: 0 0 8px; font-size: clamp(2.1rem, 5vw, 3.7rem); line-height: 1.05; letter-spacing: -.045em; }
h2 { margin: 38px 0 10px; font-size: 1.35rem; line-height: 1.25; }
p, li { color: #4e5b6d; }
.meta { margin: 0 0 30px; color: #6a7484; }
.notice { margin: 28px 0; padding: 18px 20px; border-left: 4px solid #d6a733; background: #fff9e8; }
.notice strong { color: #5b4300; }
blockquote { margin: 18px 0; padding: 16px 20px; border-left: 4px solid #1e4db7; background: #f1f5ff; color: #374762; }
footer { padding: 34px 20px; text-align: center; color: #bfc9d9; background: #071426; }
footer a { color: white; }
@media (max-width: 620px) {
  header { align-items: flex-start; flex-direction: column; }
  main { margin-top: 20px; }
}