:root {
  color-scheme: dark;
  --bg: #11130f;
  --surface: #171914;
  --ink: #ece9df;
  --muted: #92938a;
  --line: #383a31;
  --accent: #c8b46b;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  min-height: 100vh;
  color: var(--ink);
  background: var(--bg);
  font-family: "Yu Gothic", "Hiragino Sans", "Meiryo", system-ui, sans-serif;
}

a { color: inherit; text-decoration: none; }

a:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 3px;
}

.site-header,
.sitemap-shell,
.site-footer {
  width: min(1040px, calc(100% - 40px));
  margin-inline: auto;
}

.site-header {
  min-height: 72px;
  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: 10px;
  font-size: .9rem;
  font-weight: 700;
}

.brand img {
  width: 32px;
  height: 32px;
  border-radius: 50%;
  object-fit: cover;
}

.home-link {
  color: var(--muted);
  font-size: .82rem;
}

.home-link:hover { color: var(--ink); }

.sitemap-shell { padding: 42px 0 76px; }

.page-title {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 24px;
  padding-bottom: 18px;
  border-bottom: 1px solid var(--line);
}

.page-title h1 {
  margin: 0;
  font-family: "Yu Mincho", "Hiragino Mincho ProN", serif;
  font-size: clamp(2.1rem, 4vw, 3.1rem);
  font-weight: 400;
}

.page-title p {
  margin: 0;
  color: var(--muted);
  font-size: .8rem;
}

.sitemap-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 46px 72px;
  padding-top: 36px;
}

.link-group h2 {
  margin: 0 0 14px;
  font-size: .82rem;
  font-weight: 700;
  color: var(--accent);
}

.link-group nav { border-top: 1px solid var(--line); }

.link-group a {
  min-height: 52px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  padding: 12px 2px;
  border-bottom: 1px solid var(--line);
  font-family: "Yu Mincho", "Hiragino Mincho ProN", serif;
  font-size: 1.02rem;
}

.link-group a::after {
  content: "→";
  color: #66685f;
  font-family: sans-serif;
  transition: transform .15s ease, color .15s ease;
}

.link-group a:hover::after {
  color: var(--accent);
  transform: translateX(4px);
}

.secondary { grid-column: 1 / -1; }
.secondary nav { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); column-gap: 72px; }

.site-footer {
  display: flex;
  justify-content: space-between;
  gap: 20px;
  padding: 22px 0 40px;
  border-top: 1px solid var(--line);
  color: var(--muted);
  font-size: .72rem;
}

.site-footer p { margin: 0; }

@media (max-width: 680px) {
  .site-header,
  .sitemap-shell,
  .site-footer { width: calc(100% - 28px); }

  .site-header { min-height: 64px; }
  .brand span { font-size: .78rem; }
  .sitemap-shell { padding: 34px 0 60px; }
  .page-title { display: block; }
  .page-title p { margin-top: 8px; }

  .sitemap-grid {
    grid-template-columns: 1fr;
    gap: 40px;
    padding-top: 34px;
  }

  .secondary { grid-column: auto; }
  .secondary nav { grid-template-columns: 1fr; }
  .link-group a { min-height: 56px; font-size: 1rem; }
}