:root {
  color-scheme: light;
  --paper: #f6f2e9;
  --surface: rgba(255, 253, 248, 0.86);
  --ink: #1e242b;
  --muted: #626a70;
  --line: #d8d1c4;
  --accent: #9c3f32;
  --accent-soft: #efe1d8;
  font-family: "Songti SC", "Noto Serif CJK SC", "Source Han Serif SC", serif;
  font-synthesis: none;
}

* {
  box-sizing: border-box;
}

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

body {
  margin: 0;
  color: var(--ink);
  background:
    linear-gradient(rgba(156, 63, 50, 0.035) 1px, transparent 1px),
    linear-gradient(90deg, rgba(156, 63, 50, 0.025) 1px, transparent 1px),
    var(--paper);
  background-size: 32px 32px;
  line-height: 1.85;
}

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

a:hover {
  text-decoration-thickness: 2px;
}

.shell {
  width: min(920px, calc(100% - 40px));
  margin: 0 auto;
}

.masthead {
  min-height: 88px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  border-bottom: 1px solid var(--line);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  color: var(--ink);
  font-size: 1.05rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-decoration: none;
}

.seal {
  display: grid;
  place-items: center;
  width: 42px;
  height: 42px;
  border: 1px solid var(--accent);
  border-radius: 3px;
  color: var(--accent);
  font-size: 0.75rem;
  line-height: 1.1;
  letter-spacing: 0.06em;
}

.nav-link {
  font-size: 0.92rem;
}

.hero {
  padding: 94px 0 72px;
  border-bottom: 1px solid var(--line);
}

.eyebrow {
  margin: 0 0 14px;
  color: var(--accent);
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.18em;
}

h1,
h2,
h3,
p {
  margin-top: 0;
}

h1 {
  margin-bottom: 24px;
  font-size: clamp(2.75rem, 8vw, 5.7rem);
  font-weight: 600;
  letter-spacing: 0.035em;
  line-height: 1.08;
}

h2 {
  margin-bottom: 24px;
  font-size: 1.35rem;
  letter-spacing: 0.04em;
}

h3 {
  margin-bottom: 8px;
  font-size: 1rem;
}

.lede {
  max-width: 720px;
  margin-bottom: 0;
  color: #394148;
  font-size: clamp(1.06rem, 2vw, 1.24rem);
}

.lede.compact {
  max-width: 760px;
}

.panel,
.notice {
  padding: 56px 0;
  border-bottom: 1px solid var(--line);
}

.grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 18px;
}

.grid article {
  padding: 22px;
  border: 1px solid var(--line);
  border-radius: 4px;
  background: var(--surface);
}

.grid p,
.notice p,
.policy p {
  color: var(--muted);
}

.grid p {
  margin-bottom: 0;
  font-size: 0.94rem;
}

.notice p {
  max-width: 780px;
}

.notice p:last-child {
  margin-bottom: 0;
}

.policy {
  padding: 72px 0 56px;
}

.policy h1 {
  font-size: clamp(2.2rem, 6vw, 4.3rem);
}

.policy h2 {
  margin-top: 48px;
  margin-bottom: 12px;
}

.policy p {
  max-width: 790px;
}

.back-link {
  margin-top: 52px;
  padding: 20px 0;
  border-top: 1px solid var(--line);
}

footer {
  min-height: 110px;
  display: flex;
  align-items: center;
  gap: 12px;
  color: var(--muted);
  font-size: 0.82rem;
}

@media (max-width: 720px) {
  .shell {
    width: min(100% - 28px, 920px);
  }

  .masthead {
    min-height: 74px;
  }

  .hero {
    padding: 68px 0 54px;
  }

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

  .panel,
  .notice {
    padding: 44px 0;
  }

  .policy {
    padding-top: 54px;
  }

  footer {
    flex-wrap: wrap;
    align-content: center;
    padding: 22px 0;
  }
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    scroll-behavior: auto !important;
  }
}