:root {
  --bg: #fff;
  --fg: #0f172a;
  --sub: #475569;
  --border: #e5e7eb;
  --muted: #64748b;
  --accent: #22c55e;
  --accent-weak: #ecfdf5;
  --radius: 14px;
  --shadow: 0 1px 2px rgba(15, 23, 42, 0.05), 0 6px 18px rgba(15, 23, 42, 0.06);
  --font: system-ui, -apple-system, 'Noto Sans JP', 'Hiragino Kaku Gothic ProN',
    'Meiryo', sans-serif;
}
* {
  box-sizing: border-box;
}
html,
body {
  margin: 0;
  padding: 0;
  background: var(--bg);
  color: var(--fg);
  font-family: var(--font);
  line-height: 1.8;
}
a {
  color: #0ea5e9;
  text-decoration: none;
}
a:hover {
  text-decoration: underline;
}
.container {
  max-width: 960px;
  margin: 0 auto;
  padding: 0 20px;
}
header.site {
  position: sticky;
  top: 0;
  z-index: 40;
  background: #fff;
  border-bottom: 1px solid var(--border);
}
header.site .inner {
  display: flex;
  gap: 12px;
  align-items: center;
  padding: 14px 0;
}
.brand {
  display: flex;
  align-items: center;
  gap: 12px;
}
.brand .title {
  font-weight: 800;
  font-size: 18px;
}
nav.breadcrumb {
  font-size: 13px;
  color: var(--muted);
  padding: 10px 0;
}
nav.breadcrumb a {
  color: var(--muted);
}
main {
  padding: 28px 0 64px 0;
}
.hero {
  padding: 26px 0 10px 0;
}
.hero h1 {
  margin: 0 0 6px 0;
  font-size: 28px;
}
.hero p {
  margin: 0;
  color: var(--sub);
}
.card {
  position: relative;
  background: #fff;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 18px;
  margin: 14px 0;
}
.card .h {
  display: flex;
  gap: 12px;
  align-items: center;
}
.card .h .bar {
  width: 4px;
  height: 24px;
  background: var(--accent);
  border-radius: 4px;
}
.card h2 {
  margin: 0;
  font-size: 18px;
}
.card .desc {
  color: var(--sub);
  margin: 6px 0 0 0;
}
.card .ft {
  display: flex;
  gap: 12px;
  align-items: center;
  margin-top: 12px;
  flex-wrap: wrap;
}
.article {
  background: #fff;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 22px;
}
.article h1 {
  margin: 0 0 6px 0;
  font-size: 26px;
}
.article h2 {
  margin-top: 28px;
  padding-left: 10px;
  border-left: 4px solid var(--accent);
}
.article h3 {
  margin-top: 18px;
}
.table-wrap {
  overflow: auto;
  margin: 10px 0;
}
table {
  width: 100%;
  border-collapse: collapse;
  font-size: 15px;
}
th,
td {
  border: 1px solid var(--border);
  padding: 8px;
  vertical-align: top;
}
thead th {
  background: #f8fafc;
}
blockquote {
  background: #f8fafc;
  padding: 12px 14px;
  border-left: 4px solid var(--accent);
  margin: 12px 0;
  color: #0f172a;
}
footer.site {
  border-top: 1px solid var(--border);
  padding: 24px 0;
  color: #64748b;
  font-size: 14px;
}
.badge {
  display: none;
}
.card a.card-link {
  position: absolute;
  inset: 0;
  z-index: 1;
  border-radius: inherit;
}
.card a.card-link:focus {
  outline: none;
  box-shadow: 0 0 0 4px rgba(34, 197, 94, 0.25);
}
.card .h a,
.article a {
  position: relative;
  z-index: 2;
}