:root {
  color-scheme: light;
  --bg: #f6f7f8;
  --surface: #ffffff;
  --line: #e3e5e8;
  --text: #17181a;
  --muted: #5f6368;
  --heading: #202124;
  --accent: #3c4043;
}

* {
  box-sizing: border-box;
}

html {
  font-size: 16px;
}

body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Hiragino Sans", "Noto Sans JP", "Yu Gothic", sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.8;
}

a {
  color: inherit;
}

.page {
  width: min(880px, calc(100% - 32px));
  margin: 0 auto;
  padding: 24px 0 48px;
}

.header {
  margin-bottom: 20px;
}

.brand {
  font-size: 14px;
  font-weight: 700;
  color: var(--muted);
  margin: 0 0 8px;
}

.title {
  font-size: clamp(28px, 5vw, 40px);
  line-height: 1.25;
  letter-spacing: -0.03em;
  color: var(--heading);
  font-weight: 800;
  margin: 0;
}

.subtitle {
  margin: 12px 0 0;
  color: var(--muted);
  font-size: 15px;
}

.nav {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin: 20px 0 28px;
}

.nav a {
  display: inline-flex;
  align-items: center;
  min-height: 42px;
  padding: 0 14px;
  border-radius: 999px;
  background: var(--surface);
  border: 1px solid var(--line);
  text-decoration: none;
  font-size: 14px;
  font-weight: 700;
}

.card {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 24px;
  padding: 24px 22px;
}

.card + .card {
  margin-top: 16px;
}

.meta {
  margin: 0 0 12px;
  color: var(--muted);
  font-size: 13px;
  font-weight: 700;
}

.lead {
  margin: 0;
  font-size: 16px;
}

.menu {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 12px;
  margin-top: 18px;
}

.menu a {
  display: block;
  text-decoration: none;
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 20px;
  padding: 18px 16px;
}

.menu strong {
  display: block;
  font-size: 16px;
  color: var(--heading);
}

.menu span {
  display: block;
  margin-top: 8px;
  color: var(--muted);
  font-size: 14px;
  line-height: 1.7;
}

.document h2 {
  margin: 28px 0 10px;
  font-size: 19px;
  line-height: 1.5;
  font-weight: 800;
  color: var(--heading);
}

.document h2:first-child {
  margin-top: 0;
}

.document p {
  margin: 0 0 12px;
  font-size: 15px;
  color: var(--text);
}

.document ul {
  margin: 0 0 14px;
  padding-left: 1.25em;
}

.document li {
  margin: 0 0 8px;
  font-size: 15px;
  color: var(--text);
}

.footer {
  margin-top: 18px;
  color: var(--muted);
  font-size: 13px;
}

.mail-link {
  display: inline-flex;
  align-items: center;
  min-height: 48px;
  padding: 0 16px;
  border-radius: 14px;
  background: var(--accent);
  color: #ffffff;
  text-decoration: none;
  font-size: 15px;
  font-weight: 700;
}

@media (max-width: 640px) {
  .page {
    width: min(100% - 24px, 880px);
    padding: 18px 0 36px;
  }

  .card {
    border-radius: 20px;
    padding: 20px 18px;
  }
}