:root {
  --bg: #ffffff;
  --fg: #1f2328;
  --muted: #6b7280;
  --border: #e5e7eb;
  --accent: #2563eb;
  --surface: #f7f8fa;
  --code-bg: #eef0f3;
  --max: 860px;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0f1115;
    --fg: #e6e8eb;
    --muted: #9aa0a6;
    --border: #2a2e35;
    --accent: #6ea8fe;
    --surface: #171a1f;
    --code-bg: #22262d;
  }
}

* { box-sizing: border-box; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--fg);
  font-family: system-ui, -apple-system, "Segoe UI", "Yu Gothic UI",
    "Hiragino Sans", Meiryo, sans-serif;
  line-height: 1.75;
  font-size: 16px;
}

main {
  max-width: var(--max);
  margin: 0 auto;
  padding: 2rem 1.25rem 5rem;
}

a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }

code {
  font-family: ui-monospace, "Cascadia Mono", Consolas, monospace;
  background: var(--code-bg);
  padding: 0.12em 0.38em;
  border-radius: 4px;
  font-size: 0.9em;
}
pre {
  background: var(--code-bg);
  padding: 1rem;
  border-radius: 8px;
  overflow-x: auto;
}
pre code { background: none; padding: 0; }

.muted { color: var(--muted); }
.small { font-size: 0.85rem; }

/* --- header / footer --- */

.site-header {
  display: flex;
  align-items: baseline;
  gap: 1.5rem;
  max-width: var(--max);
  margin: 0 auto;
  padding: 1.25rem;
  border-bottom: 1px solid var(--border);
}
.brand { font-weight: 700; color: var(--fg); font-size: 1.05rem; }
.site-header nav { display: flex; gap: 1rem; font-size: 0.9rem; }

.site-footer {
  max-width: var(--max);
  margin: 0 auto;
  padding: 1.5rem 1.25rem 3rem;
  border-top: 1px solid var(--border);
  font-size: 0.85rem;
  color: var(--muted);
}

/* --- page head --- */

h1 { font-size: 1.7rem; line-height: 1.35; margin: 0 0 0.5rem; }
h2 {
  font-size: 1.25rem;
  margin: 3rem 0 0.75rem;
  padding-top: 0.5rem;
  scroll-margin-top: 1rem;
}
h3 { font-size: 1.05rem; margin: 2rem 0 0.5rem; }

.crumb { font-size: 0.85rem; margin: 0 0 0.5rem; }

.meta {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 0.15rem 1rem;
  margin: 1rem 0;
  font-size: 0.85rem;
}
.meta dt { color: var(--muted); }
.meta dd { margin: 0; }

.tags { display: flex; flex-wrap: wrap; gap: 0.4rem; margin: 1rem 0; }
.tag {
  display: inline-block;
  font-size: 0.8rem;
  padding: 0.15rem 0.6rem;
  border: 1px solid var(--border);
  border-radius: 999px;
  color: var(--muted);
}
.tag:hover { border-color: var(--accent); text-decoration: none; }
.tag .count { opacity: 0.6; }

/* --- toc --- */

.toc {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 0.9rem 1rem;
  margin: 1.5rem 0 2.5rem;
}
.toc-label { font-size: 0.78rem; color: var(--muted); }
.toc ul {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem 1rem;
  margin: 0.5rem 0 0;
  padding: 0;
}

/* --- compare viewer --- */

.compare { scroll-margin-top: 1rem; }

/* --- cards --- */

.hero { margin-bottom: 3rem; }
.hero h1 { font-size: 2rem; }

.card-list { list-style: none; padding: 0; display: grid; gap: 1rem; }
.card {
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 1rem 1.1rem;
  background: var(--surface);
}
.card-title { font-weight: 600; font-size: 1.05rem; }
.card-node { margin-left: 0.5rem; font-size: 0.8rem; }
.card-parms { display: flex; flex-wrap: wrap; gap: 0.5rem; margin: 0.5rem 0 0.3rem; }
.card p { margin: 0.35rem 0 0; }

/* --- body --- */

.body table {
  border-collapse: collapse;
  width: 100%;
  font-size: 0.9rem;
  display: block;
  overflow-x: auto;
}
.body th, .body td {
  border: 1px solid var(--border);
  padding: 0.4rem 0.7rem;
  text-align: left;
}
.body th { background: var(--surface); }
.body blockquote {
  margin: 1.5rem 0;
  padding: 0.1rem 1rem;
  border-left: 3px solid var(--border);
  color: var(--muted);
}
.body img { max-width: 100%; height: auto; }