:root {
  color-scheme: light;
  --ink: #15212b;
  --muted: #586875;
  --line: #d9e2e8;
  --paper: #ffffff;
  --wash: #f4f8fa;
  --brand: #0d4d6c;
  --brand-deep: #0a3047;
  --accent: #e6f4f8;
  font-family: "Hiragino Sans", "Yu Gothic UI", "Yu Gothic", Meiryo, system-ui, sans-serif;
}

* {
  box-sizing: border-box;
}

html {
  background: var(--wash);
}

body {
  margin: 0;
  color: var(--ink);
  background:
    linear-gradient(180deg, #edf6f8 0, var(--wash) 18rem, var(--wash) 100%);
  font-size: 1rem;
  line-height: 1.8;
}

a {
  color: var(--brand);
  text-underline-offset: 0.18em;
}

a:hover {
  color: var(--brand-deep);
}

a:focus-visible {
  outline: 3px solid #86c8da;
  outline-offset: 3px;
  border-radius: 0.15rem;
}

.shell {
  width: min(100% - 2rem, 52rem);
  margin: 0 auto;
}

.site-header {
  padding: 1.4rem 0;
  border-bottom: 1px solid rgba(13, 77, 108, 0.14);
}

.site-header .shell {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}

.brand {
  color: var(--brand-deep);
  font-weight: 760;
  letter-spacing: 0.01em;
  text-decoration: none;
}

.scope-label {
  color: var(--muted);
  font-size: 0.875rem;
}

main {
  margin: 3rem auto 4rem;
}

.eyebrow {
  margin: 0 0 0.5rem;
  color: var(--brand);
  font-size: 0.82rem;
  font-weight: 760;
  letter-spacing: 0.09em;
  text-transform: uppercase;
}

h1,
h2 {
  color: var(--brand-deep);
  line-height: 1.35;
}

h1 {
  margin: 0;
  font-size: clamp(2rem, 6vw, 3.25rem);
  letter-spacing: -0.035em;
}

h2 {
  margin: 2.25rem 0 0.65rem;
  font-size: 1.25rem;
}

p,
ul {
  margin: 0.7rem 0;
}

ul {
  padding-left: 1.35rem;
}

.lead {
  max-width: 43rem;
  margin-top: 1.15rem;
  color: #334652;
  font-size: 1.1rem;
}

.notice {
  margin-top: 2rem;
  padding: 1rem 1.15rem;
  border: 1px solid #bfdce5;
  border-radius: 0.55rem;
  background: var(--accent);
}

.card-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1rem;
  margin-top: 2.25rem;
}

.card {
  padding: 1.25rem;
  border: 1px solid var(--line);
  border-radius: 0.65rem;
  background: var(--paper);
}

.card h2 {
  margin-top: 0;
}

.policy {
  padding: clamp(1.25rem, 4vw, 2.5rem);
  border: 1px solid var(--line);
  border-radius: 0.75rem;
  background: var(--paper);
}

.policy h1 {
  font-size: clamp(1.8rem, 5vw, 2.65rem);
}

.updated {
  color: var(--muted);
  font-size: 0.9rem;
}

.site-footer {
  padding: 1.5rem 0 2.2rem;
  border-top: 1px solid var(--line);
  color: var(--muted);
  font-size: 0.9rem;
}

.site-footer nav {
  display: flex;
  flex-wrap: wrap;
  gap: 0.45rem 1.2rem;
  margin-bottom: 0.6rem;
}

@media (max-width: 42rem) {
  .site-header .shell {
    align-items: flex-start;
    flex-direction: column;
  }

  .card-grid {
    grid-template-columns: 1fr;
  }

  main {
    margin-top: 2rem;
  }
}