:root {
  --bg: #f7f9fb;
  --surface: #ffffff;
  --ink: #1f2933;
  --ink-soft: #52606d;
  --line: #e4e7eb;
  --accent: #2d5fa6;
  --accent-soft: #e8f0fb;
  --nhb: #2d5fa6;
  --shb: #c75a36;
  --re:  #6b3aa3;
  --hh:  #2f8f5a;
  --pink:#c93f7d;
  --other:#475569;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  font-family: "Hiragino Sans", "Hiragino Kaku Gothic ProN", "Yu Gothic UI", "Meiryo", system-ui, -apple-system, "Segoe UI", sans-serif;
  background: var(--bg);
  color: var(--ink);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
}

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

header.site {
  background: linear-gradient(135deg, #1d3f70, #2d5fa6);
  color: #fff;
  padding: 1.4rem 1.2rem;
  box-shadow: 0 2px 4px rgba(0,0,0,0.08);
}
header.site .inner {
  max-width: 1200px;
  margin: 0 auto;
  display: flex;
  align-items: baseline;
  flex-wrap: wrap;
  gap: 1rem;
}
header.site h1 {
  margin: 0;
  font-size: 1.4rem;
  letter-spacing: 0.02em;
}
header.site h1 a { color: #fff; }
header.site .subtitle {
  font-size: 0.85rem;
  color: #cfe0f7;
}

nav.breadcrumb {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0.8rem 1.2rem;
  font-size: 0.85rem;
  color: var(--ink-soft);
}
nav.breadcrumb a { color: var(--ink-soft); }
nav.breadcrumb span.sep { margin: 0 0.4rem; color: #aab2bd; }

main {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 1.2rem 4rem;
}

.hero {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 1.8rem;
  margin: 1rem 0 2rem;
}
.hero h2 {
  margin: 0 0 0.6rem;
  font-size: 1.6rem;
}
.hero p { margin: 0.3rem 0; color: var(--ink-soft); }

.category-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 1rem;
  margin: 1.5rem 0;
}
.category-card {
  display: block;
  background: var(--surface);
  border: 1px solid var(--line);
  border-left: 6px solid var(--accent);
  border-radius: 10px;
  padding: 1.2rem 1.3rem;
  transition: transform .15s, box-shadow .15s;
  color: var(--ink);
}
.category-card:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 18px rgba(20,40,80,0.08);
  text-decoration: none;
}
.category-card h3 {
  margin: 0 0 0.3rem;
  font-size: 1.1rem;
  color: var(--accent);
}
.category-card .count {
  display: inline-block;
  font-size: 0.78rem;
  background: var(--accent-soft);
  color: var(--accent);
  padding: 0.1rem 0.6rem;
  border-radius: 999px;
  margin-left: 0.4rem;
}
.category-card p { margin: 0.4rem 0 0; font-size: 0.9rem; color: var(--ink-soft); }

.category-card.nhb  { border-left-color: var(--nhb); }
.category-card.nhb h3, .badge.nhb { color: var(--nhb); }
.category-card.shb  { border-left-color: var(--shb); }
.category-card.shb h3, .badge.shb { color: var(--shb); }
.category-card.re   { border-left-color: var(--re); }
.category-card.re h3, .badge.re { color: var(--re); }
.category-card.hh   { border-left-color: var(--hh); }
.category-card.hh h3, .badge.hh { color: var(--hh); }
.category-card.pink { border-left-color: var(--pink); }
.category-card.pink h3, .badge.pink { color: var(--pink); }
.category-card.other{ border-left-color: var(--other); }
.category-card.other h3, .badge.other { color: var(--other); }

.section-title {
  margin: 2.5rem 0 0.3rem;
  font-size: 1.25rem;
  border-bottom: 2px solid var(--accent);
  padding-bottom: 0.3rem;
}
.section-desc {
  color: var(--ink-soft);
  font-size: 0.9rem;
  margin: 0.4rem 0 1rem;
}

table.variety-table {
  width: 100%;
  border-collapse: collapse;
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 10px;
  overflow: hidden;
  font-size: 0.92rem;
  margin-bottom: 1.5rem;
}
table.variety-table th,
table.variety-table td {
  padding: 0.65rem 0.8rem;
  text-align: left;
  border-bottom: 1px solid var(--line);
  vertical-align: top;
}
table.variety-table thead th {
  background: #f1f5fa;
  color: var(--ink);
  font-weight: 600;
  font-size: 0.85rem;
  letter-spacing: 0.02em;
}
table.variety-table tbody tr:hover { background: #fafbfd; }
table.variety-table .num {
  width: 3rem;
  color: var(--ink-soft);
  font-variant-numeric: tabular-nums;
  font-size: 0.85rem;
}
table.variety-table .name a {
  font-weight: 600;
}
table.variety-table .name .en {
  display: block;
  font-size: 0.78rem;
  color: var(--ink-soft);
  font-weight: 400;
  margin-top: 0.1rem;
}

.subgroup {
  margin: 1.6rem 0 0.4rem;
  font-size: 1.02rem;
  color: var(--ink);
  background: #eef2f7;
  border-left: 4px solid var(--accent);
  padding: 0.45rem 0.8rem;
  border-radius: 4px;
}

/* Detail page */
.detail-header {
  background: var(--surface);
  border: 1px solid var(--line);
  border-top: 5px solid var(--accent);
  border-radius: 12px;
  padding: 1.6rem 1.8rem 1.2rem;
  margin-top: 1rem;
}
.detail-header.nhb  { border-top-color: var(--nhb); }
.detail-header.shb  { border-top-color: var(--shb); }
.detail-header.re   { border-top-color: var(--re); }
.detail-header.hh   { border-top-color: var(--hh); }
.detail-header.pink { border-top-color: var(--pink); }
.detail-header.other{ border-top-color: var(--other); }

.detail-header h2 {
  margin: 0 0 0.4rem;
  font-size: 1.7rem;
}
.detail-header .en-name {
  font-size: 1rem;
  color: var(--ink-soft);
  margin-left: 0.6rem;
  font-weight: 400;
}
.badge {
  display: inline-block;
  font-size: 0.78rem;
  font-weight: 600;
  background: var(--accent-soft);
  padding: 0.15rem 0.7rem;
  border-radius: 999px;
  margin-right: 0.3rem;
}
.meta-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 0.4rem 1.2rem;
  margin-top: 0.8rem;
  font-size: 0.92rem;
}
.meta-grid .k { color: var(--ink-soft); margin-right: 0.4rem; }
.meta-grid .v { color: var(--ink); font-weight: 500; }

.detail-body {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 1.4rem 1.8rem 2rem;
  margin-top: 1rem;
}
.detail-body h3 {
  margin: 1.6rem 0 0.5rem;
  font-size: 1.1rem;
  color: var(--accent);
  border-left: 4px solid var(--accent);
  padding-left: 0.6rem;
}
.detail-body h3:first-child { margin-top: 0.2rem; }
.detail-body p { margin: 0.5rem 0; }
.detail-body ul { padding-left: 1.4rem; margin: 0.4rem 0; }
.detail-body li { margin: 0.2rem 0; }
.detail-body strong { color: var(--ink); }
.detail-body a { word-break: break-all; }
.detail-body code {
  background: #f1f3f6;
  padding: 0.05rem 0.35rem;
  border-radius: 4px;
  font-size: 0.9em;
}

.nav-prev-next {
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  margin-top: 2rem;
  flex-wrap: wrap;
}
.nav-prev-next a {
  flex: 1 1 45%;
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 0.8rem 1rem;
  color: var(--ink);
  font-size: 0.9rem;
}
.nav-prev-next a:hover { background: var(--accent-soft); text-decoration: none; }
.nav-prev-next .label { display:block; font-size: 0.75rem; color: var(--ink-soft); }

footer.site {
  text-align: center;
  padding: 2rem 1rem;
  color: var(--ink-soft);
  font-size: 0.82rem;
  border-top: 1px solid var(--line);
  background: #fff;
  margin-top: 3rem;
}

@media (max-width: 640px) {
  header.site h1 { font-size: 1.15rem; }
  .hero { padding: 1.2rem; }
  .detail-header, .detail-body { padding: 1.1rem; }
  table.variety-table { font-size: 0.85rem; }
  table.variety-table th, table.variety-table td { padding: 0.5rem 0.55rem; }
}

/* SEO heading restructure — preserve original visual hierarchy */
header.site .brand { margin:0; font-size:1.4rem; letter-spacing:0.02em; font-weight:700; line-height:1.3; }
header.site .brand a { color:#fff; }
.detail-header h1 { margin:0 0 0.4rem; font-size:1.7rem; }
.hero h1 { margin:0 0 0.6rem; font-size:1.6rem; }
@media (max-width:640px){ header.site .brand { font-size:1.15rem; } }