:root {
  color-scheme: light;
  --paper: #f3efe5;
  --paper-dark: #e7e1d4;
  --ink: #272d29;
  --muted: #5d675f;
  --line: #c7c5b8;
  --line-dark: #747c72;
  --rust: #873d30;
  --blue: #31545d;
  --serif: "Yu Mincho", "Hiragino Mincho ProN", "MS Mincho", serif;
}

* { box-sizing: border-box; }
body { margin: 0; color: var(--ink); background: var(--paper); font-family: system-ui, -apple-system, "Segoe UI", "Noto Sans JP", "Hiragino Sans", Meiryo, sans-serif; line-height: 1.75; }
a { color: inherit; text-decoration: none; }
a:hover { color: var(--rust); }
a:focus-visible { outline: 2px solid var(--rust); outline-offset: 4px; }
.skip-link {
  position: absolute;
  top: 0;
  left: 1rem;
  z-index: 1000;
  transform: translateY(-150%);
  display: inline-flex;
  min-height: 44px;
  align-items: center;
  padding: .5rem .85rem;
  border: 2px solid var(--ink);
  background: var(--paper);
  color: var(--ink);
}
.skip-link:focus-visible { transform: translateY(1rem); }
.site-header, .sitemap-shell, .site-footer { width: min(1060px, calc(100% - 40px)); margin-inline: auto; }
.site-header { display: flex; justify-content: space-between; align-items: center; gap: 20px; padding: 17px 0 13px; border-bottom: 1px solid var(--line-dark); }
.brand { display: inline-flex; min-height: 44px; align-items: center; gap: 10px; color: var(--ink); font-size: .9rem; font-weight: 650; }
.brand img { width: 36px; height: 36px; flex: 0 0 auto; border: 0; border-radius: 50%; clip-path: circle(50%); object-fit: cover; }
.home-link { display: inline-flex; min-height: 44px; align-items: center; color: var(--blue); font-size: .88rem; text-decoration: underline; text-underline-offset: 4px; }
.sitemap-shell { padding: 38px 0 66px; }
.page-title { padding: 0 4px 19px; border-bottom: 1px solid var(--line); }
.page-title > p:first-child { margin: 0 0 4px; color: var(--rust); font-size: .84rem; font-weight: 700; }
.page-title h1 { margin: 0; font-family: var(--serif); font-size: clamp(2rem, 5vw, 3rem); font-weight: 500; letter-spacing: -.03em; }
.sitemap-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 42px 64px; padding: 30px 4px 0; }
.link-group h2 { margin: 0 0 10px; font-family: var(--serif); font-size: 1.27rem; font-weight: 500; }
.link-group nav { border-top: 1px solid var(--line-dark); }
.link-group nav a { display: flex; justify-content: space-between; align-items: baseline; gap: 18px; padding: 10px 3px; border-bottom: 1px solid var(--line); color: var(--blue); }
.link-group nav a span { min-width: 0; color: var(--muted); font-size: .82rem; text-align: right; overflow-wrap: anywhere; }
.link-group nav a:hover { color: var(--rust); }
.archive-group { grid-column: 1 / -1; }
.archive-group nav { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); column-gap: 36px; }
.site-footer { display: flex; justify-content: space-between; gap: 12px 20px; padding: 16px 0 30px; border-top: 1px solid var(--line-dark); color: var(--muted); font-size: .8rem; }
.site-footer p { margin: 0; }
.site-footer a { display: inline-flex; min-height: 44px; align-items: center; color: var(--blue); text-decoration: underline; text-underline-offset: 4px; }
@media (max-width: 680px) {
  .site-header, .sitemap-shell, .site-footer { width: calc(100% - 28px); }
  .site-header { display: grid; grid-template-columns: minmax(0, 1fr) auto; gap: 12px; }
  .brand { min-width: 0; }
  .home-link { white-space: nowrap; justify-self: end; }
  .sitemap-shell { padding-top: 28px; }
  .sitemap-grid { grid-template-columns: 1fr; gap: 30px; padding: 24px 2px 0; }
  .archive-group { grid-column: auto; }
  .archive-group nav { grid-template-columns: 1fr; }
  .link-group nav a { flex-wrap: wrap; justify-content: flex-start; gap: 2px 8px; }
  .link-group nav a span { flex: 0 0 100%; text-align: left; }
  .site-footer { flex-direction: column; align-items: flex-start; }
}