:root {
  --bg: #fbfaf8;
  --surface: #ffffff;
  --text: #22201d;
  --muted: #6b6560;
  --border: #e6e1da;
  --accent: #b2573a;
  --accent-soft: #fdf1ec;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #1a1816;
    --surface: #221f1d;
    --text: #ece8e3;
    --muted: #a39b93;
    --border: #38332f;
    --accent: #e89478;
    --accent-soft: #2b2320;
  }
}

* { box-sizing: border-box; }

html { -webkit-text-size-adjust: 100%; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, "Hiragino Sans", "Noto Sans JP",
    "Yu Gothic UI", "Segoe UI", sans-serif;
  font-size: 16px;
  line-height: 1.9;
  letter-spacing: 0.01em;
}

.wrap {
  max-width: 44rem;
  margin: 0 auto;
  padding: 0 1.25rem 5rem;
}

header.site {
  border-bottom: 1px solid var(--border);
  margin-bottom: 2.5rem;
}

header.site .wrap {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding-top: 1.1rem;
  padding-bottom: 1.1rem;
  margin-bottom: 0;
}

header.site a.home {
  font-weight: 600;
  text-decoration: none;
  color: var(--text);
}

header.site nav a {
  color: var(--muted);
  text-decoration: none;
  margin-left: 1.1rem;
  font-size: 0.925rem;
}

header.site nav a:hover { color: var(--accent); }

h1 {
  font-size: 1.85rem;
  line-height: 1.5;
  margin: 2.5rem 0 0.6rem;
  letter-spacing: 0.005em;
}

h2 {
  font-size: 1.2rem;
  margin: 3rem 0 0.75rem;
  padding-top: 1.5rem;
  border-top: 1px solid var(--border);
}

h3 { font-size: 1.03rem; margin: 2rem 0 0.5rem; }

p { margin: 0.9rem 0; }

a { color: var(--accent); }

.lead {
  color: var(--muted);
  font-size: 1.05rem;
  margin-bottom: 2.5rem;
}

ul { padding-left: 1.3rem; }
li { margin: 0.4rem 0; }

table {
  width: 100%;
  border-collapse: collapse;
  margin: 1.2rem 0;
  font-size: 0.925rem;
  display: block;
  overflow-x: auto;
}

th, td {
  border: 1px solid var(--border);
  padding: 0.5rem 0.7rem;
  text-align: left;
  vertical-align: top;
}

th { background: var(--accent-soft); font-weight: 600; white-space: nowrap; }

code {
  background: var(--accent-soft);
  padding: 0.1em 0.35em;
  border-radius: 4px;
  font-size: 0.9em;
  font-family: ui-monospace, SFMono-Regular, Menlo, monospace;
}

.card {
  display: block;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 1.25rem 1.4rem;
  margin: 1rem 0;
  text-decoration: none;
  color: inherit;
}

a.card:hover { border-color: var(--accent); }

.card h3 { margin: 0 0 0.3rem; }
.card p { margin: 0; color: var(--muted); font-size: 0.95rem; }

.notice {
  background: var(--accent-soft);
  border: 1px solid var(--border);
  border-left: 3px solid var(--accent);
  border-radius: 10px;
  padding: 1rem 1.25rem;
  margin: 1.75rem 0;
}

.notice p { margin: 0.4rem 0; }
.notice p:first-child { margin-top: 0; font-weight: 600; }
.notice p:last-child { margin-bottom: 0; }

.meta { color: var(--muted); font-size: 0.925rem; }

footer.site {
  border-top: 1px solid var(--border);
  margin-top: 4rem;
  padding-top: 1.5rem;
  color: var(--muted);
  font-size: 0.9rem;
}

footer.site a { color: var(--muted); }