:root {
  --bg: #f7f5f0;
  --panel: #ffffff;
  --ink: #2a2f28;
  --sub: #5a5f52;
  --accent: #1f4d3a;
  --accent-soft: #e7efe9;
  --accent2: #b5482f;
  --border: #ddd8cc;
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: "Zen Kaku Gothic New", "Hiragino Sans", "Noto Sans JP", sans-serif;
  font-size: 16px;
  line-height: 1.8;
}

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

.site-header {
  position: sticky;
  top: 0;
  z-index: 10;
  background: var(--panel);
  border-bottom: 1px solid var(--border);
}

.site-header-inner {
  max-width: 960px;
  margin: 0 auto;
  padding: 14px 16px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  flex-wrap: wrap;
}

.site-title {
  font-weight: 700;
  font-size: 18px;
  color: var(--accent);
  text-decoration: none;
}

.nav-links {
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
  font-size: 16px;
}

.nav-links a { text-decoration: none; color: var(--ink); }
.nav-links a:hover { color: var(--accent); }

main {
  max-width: 680px;
  margin: 0 auto;
  padding: 32px 16px 64px;
}

main.wide { max-width: 900px; }

.hero {
  max-width: 960px;
  margin: 0 auto;
  padding: 28px 16px;
  text-align: left;
}

.hero h1 {
  font-size: 30px;
  line-height: 1.4;
  margin: 0 0 8px;
  word-break: keep-all;
  overflow-wrap: anywhere;
  text-wrap: balance;
}

.hero p { color: var(--sub); font-size: 16px; margin: 0; }

h1 {
  font-size: 30px;
  line-height: 1.4;
  margin: 0 0 16px;
  word-break: keep-all;
  overflow-wrap: anywhere;
  text-wrap: balance;
}

h2 {
  font-size: 22px;
  line-height: 1.4;
  margin: 40px 0 16px;
  padding: 10px 14px;
  background: var(--accent-soft);
  border-left: 4px solid var(--accent);
  word-break: keep-all;
  text-wrap: balance;
}

h3 {
  font-size: 18px;
  margin: 28px 0 10px;
}

p { margin: 0 0 16px; font-size: 18px; }

.lead { font-size: 18px; color: var(--sub); }

table {
  width: 100%;
  border-collapse: collapse;
  margin: 16px 0 24px;
  font-size: 16px;
}

thead th {
  background: var(--accent);
  color: #fff;
  text-align: left;
  padding: 10px 12px;
}

tbody td {
  padding: 10px 12px;
  border-bottom: 1px solid var(--border);
}

tbody tr:nth-child(even) { background: #f2f0e8; }

.table-scroll {
  overflow-x: auto;
}

.callout {
  border-left: 4px solid var(--accent2);
  background: #fbeee9;
  padding: 12px 16px;
  margin: 20px 0;
  font-size: 16px;
}

.callout strong { color: var(--accent2); }

.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
  gap: 12px;
  margin: 20px 0 32px;
}

.card {
  display: block;
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 16px;
  text-decoration: none;
  color: var(--ink);
}

.card h3 { margin: 0 0 6px; font-size: 17px; }
.card p { margin: 0; font-size: 16px; color: var(--sub); }

.faq dt {
  font-weight: 700;
  margin-top: 20px;
  padding-left: 28px;
  position: relative;
}
.faq dt::before {
  content: "問";
  position: absolute;
  left: 0;
  color: #fff;
  background: var(--accent2);
  font-size: 12px;
  padding: 1px 6px;
  border-radius: 4px;
}
.faq dd {
  margin: 8px 0 0;
  padding-left: 28px;
  position: relative;
}
.faq dd::before {
  content: "答";
  position: absolute;
  left: 0;
  color: #fff;
  background: var(--accent);
  font-size: 12px;
  padding: 1px 6px;
  border-radius: 4px;
}

.source-note {
  font-size: 16px;
  color: var(--sub);
  border-top: 1px solid var(--border);
  margin-top: 40px;
  padding-top: 16px;
  overflow-wrap: anywhere;
}
.source-note ul { padding-left: 20px; }
.source-note li { overflow-wrap: anywhere; }

.related-links {
  margin-top: 32px;
  padding-top: 20px;
  border-top: 1px solid var(--border);
}
.related-links h2 { margin-top: 0; }

.info-list div {
  display: flex;
  gap: 12px;
  padding: 8px 0;
  border-bottom: 1px solid var(--border);
  font-size: 16px;
}
.info-list dt { flex: 0 0 110px; font-weight: 700; color: var(--sub); }
.info-list dd { margin: 0; }

.history-list { list-style: none; padding: 0; }
.history-list li {
  padding: 12px 0;
  border-bottom: 1px solid var(--border);
  font-size: 16px;
}
.history-list time { font-weight: 700; color: var(--accent); margin-right: 10px; }

.site-footer {
  border-top: 1px solid var(--border);
  padding: 24px 16px;
  text-align: center;
  font-size: 16px;
  color: var(--sub);
}
.site-footer a { color: var(--sub); margin: 0 8px; }

@media (max-width: 480px) {
  h1, .hero h1 { font-size: 24px; }
  h2 { font-size: 19px; }
  p, .lead { font-size: 16px; }
}