:root {
  --ink: #161b22;
  --text: #3d4550;
  --muted: #6a7380;
  --line: #e3e6ea;
  --line-soft: #eef0f3;
  --brand: #12355b;
}

* { box-sizing: border-box; margin: 0; padding: 0; }
html { -webkit-text-size-adjust: 100%; }
body {
  background: #fff;
  color: var(--ink);
  font: 17px/1.6 -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
}
a { color: inherit; }

.wrap { max-width: 1080px; margin: 0 auto; padding: 0 32px; }

.top { border-bottom: 1px solid var(--line); }
.top .wrap { min-height: 72px; display: flex; flex-wrap: wrap; justify-content: space-between; align-items: center; gap: 8px 20px; }
.mark { font-weight: 650; font-size: 19px; letter-spacing: -.01em; text-decoration: none; color: var(--brand); }
.top nav { display: flex; gap: 28px; }
.top nav a { color: #535c68; font-size: 15px; text-decoration: none; }
.top nav a:hover { color: var(--brand); }

.hero { padding: 104px 0 96px; }
.kicker { color: var(--brand); font-size: 15px; font-weight: 600; margin-bottom: 18px; }
h1 { font-size: 68px; line-height: 1.05; letter-spacing: -.025em; font-weight: 650; max-width: 14ch; }
.lead { font-size: 21px; line-height: 1.5; color: var(--text); max-width: 40em; margin-top: 28px; }

section:not(.hero) { border-top: 1px solid var(--line); padding: 64px 0; }
h2 { font-size: 15px; font-weight: 600; color: var(--brand); margin-bottom: 32px; }

.items { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 48px; }
h3 { font-size: 21px; font-weight: 620; letter-spacing: -.01em; margin-bottom: 10px; }
.items p { color: var(--text); }

dl > div { display: grid; grid-template-columns: 240px minmax(0, 1fr); padding: 14px 0; border-bottom: 1px solid var(--line-soft); }
dl > div:last-child { border-bottom: 0; }
dt { color: var(--muted); }

.mail { font-size: 32px; font-weight: 600; letter-spacing: -.02em; color: var(--brand); text-decoration: none; overflow-wrap: anywhere; }
.mail:hover { text-decoration: underline; text-underline-offset: 4px; }

footer { border-top: 1px solid var(--line); padding: 26px 0; color: var(--muted); font-size: 14px; }
footer .wrap { display: flex; justify-content: space-between; gap: 20px; }

.doc { padding: 72px 0 88px; }
.doc h1 { font-size: 52px; }
.doc .updated { color: var(--muted); margin-top: 14px; }
.doc .body { max-width: 44em; margin-top: 48px; }
.doc .body h2 { font-size: 21px; font-weight: 620; letter-spacing: -.01em; color: var(--ink); margin: 40px 0 10px; }
.doc .body h2:first-child { margin-top: 0; }
.doc .body p { color: var(--text); margin-bottom: 12px; }
.doc .body a { color: var(--brand); }

@media (max-width: 720px) {
  .wrap { padding: 0 16px; }
  .top .wrap { padding-top: 14px; padding-bottom: 14px; min-height: 0; }
  .top nav { gap: 18px; }
  .hero { padding: 56px 0 52px; }
  h1 { font-size: 44px; }
  .lead { font-size: 18px; margin-top: 20px; }
  section:not(.hero) { padding: 44px 0; }
  h2 { margin-bottom: 22px; }
  .items { grid-template-columns: minmax(0, 1fr); gap: 28px; }
  dl > div { grid-template-columns: minmax(0, 1fr); gap: 2px; padding: 12px 0; }
  .mail { font-size: 22px; }
  .doc { padding: 44px 0 56px; }
  .doc h1 { font-size: 40px; }
  .doc .body { margin-top: 32px; }
}