:root {
  --ink: #16181d;
  --sub: #5b6170;
  --line: #e4e6eb;
  --bg: #ffffff;
  --tint: #f6f7f9;
  --accent: #f26b1d;
}
* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: "Noto Sans JP", system-ui, -apple-system, "Hiragino Sans", sans-serif;
  line-height: 1.8;
  font-feature-settings: "palt";
}
a { color: inherit; }
.wrap { max-width: 960px; margin: 0 auto; padding: 0 24px; }
header { border-bottom: 1px solid var(--line); }
header .wrap { display: flex; align-items: center; justify-content: space-between; height: 64px; }
.logo { font-weight: 700; font-size: 20px; letter-spacing: 0.02em; text-decoration: none; }
.logo span { color: var(--accent); }
nav { display: flex; gap: 20px; font-size: 14px; }
nav a { text-decoration: none; color: var(--sub); }
nav a:hover { color: var(--ink); }

.hero { padding: 96px 0 80px; }
.hero h1 { font-size: clamp(32px, 6vw, 52px); line-height: 1.3; margin: 0 0 24px; letter-spacing: 0.01em; text-wrap: balance; }
.hero p { font-size: 17px; color: var(--sub); max-width: 36em; margin: 0; }

section { padding: 64px 0; border-top: 1px solid var(--line); }
.label { font-size: 12px; font-weight: 700; letter-spacing: 0.14em; color: var(--accent); margin: 0 0 12px; }
h2 { font-size: 26px; line-height: 1.4; margin: 0 0 20px; }
.grid { display: grid; gap: 24px; grid-template-columns: repeat(auto-fit, minmax(260px, 1fr)); }
.card { background: var(--tint); border-radius: 12px; padding: 28px; }
.card h3 { margin: 0 0 8px; font-size: 18px; }
.card p { margin: 0; color: var(--sub); font-size: 15px; }

dl.info { display: grid; grid-template-columns: 9em 1fr; gap: 12px 24px; margin: 0; }
dl.info dt { color: var(--sub); }
dl.info dd { margin: 0; }

.doc { padding: 64px 0 96px; }
.doc .wrap { max-width: 760px; }
.doc h1 { font-size: 32px; margin: 0 0 8px; }
.doc .date { color: var(--sub); font-size: 14px; margin: 0 0 40px; }
.doc h2 { font-size: 19px; margin: 40px 0 12px; }
.doc p, .doc li { font-size: 15.5px; }
.doc ul, .doc ol { padding-left: 1.4em; }

footer { border-top: 1px solid var(--line); padding: 32px 0 48px; font-size: 13px; color: var(--sub); }
footer .wrap { display: flex; flex-wrap: wrap; gap: 12px 24px; justify-content: space-between; }
footer nav { gap: 16px; font-size: 13px; }

@media (max-width: 560px) {
  .hero { padding: 64px 0 56px; }
  dl.info { grid-template-columns: 1fr; gap: 2px; }
  dl.info dd { margin-bottom: 12px; }
  nav { gap: 14px; }
}