:root {
  color-scheme: light;
  --ink: #181714;
  --muted: #615d54;
  --paper: #fbfaf6;
  --panel: #ffffff;
  --wash: #eef3ee;
  --line: #d7d2c7;
  --pine: #255443;
  --vermilion: #9d2f22;
  --indigo: #315b7a;
  --plum: #6f3f5f;
  --gold: #9c742f;
  --shadow: 0 18px 50px rgba(24, 23, 20, 0.08);
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: "Iowan Old Style", "Palatino Linotype", Palatino, "Yu Mincho",
    "Hiragino Mincho ProN", "Noto Serif CJK JP", "Times New Roman", serif;
  font-size: 18px;
  line-height: 1.72;
}

a {
  color: var(--indigo);
  text-decoration-color: rgba(49, 91, 122, 0.35);
  text-decoration-thickness: 1px;
  text-underline-offset: 0.14em;
}

a:hover {
  color: var(--vermilion);
  text-decoration-color: rgba(157, 47, 34, 0.55);
}

.skip-link {
  left: 1rem;
  padding: 0.6rem 0.8rem;
  position: absolute;
  top: -4rem;
  z-index: 100;
  background: var(--ink);
  color: #fff;
}

.skip-link:focus {
  top: 1rem;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  background: rgba(251, 250, 246, 0.94);
  border-bottom: 1px solid var(--line);
  backdrop-filter: blur(10px);
}

.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  max-width: 1180px;
  margin: 0 auto;
  padding: 0.82rem 1.25rem;
}

.brand {
  color: var(--ink);
  font-size: 0.95rem;
  font-weight: 700;
  letter-spacing: 0;
  text-decoration: none;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 0.3rem;
  flex-wrap: wrap;
}

.nav-links a {
  border: 1px solid transparent;
  border-radius: 8px;
  color: var(--muted);
  font-size: 0.88rem;
  line-height: 1.2;
  padding: 0.42rem 0.58rem;
  text-decoration: none;
}

.nav-links a:hover,
.nav-links a[aria-current="page"] {
  border-color: var(--line);
  color: var(--ink);
  background: var(--panel);
}

main {
  overflow: hidden;
}

.hero,
.page-hero,
.section,
.footer-inner {
  max-width: 1180px;
  margin: 0 auto;
  padding-left: 1.25rem;
  padding-right: 1.25rem;
}

.hero {
  display: grid;
  grid-template-columns: minmax(0, 1.04fr) minmax(340px, 0.76fr);
  gap: 2.2rem;
  align-items: center;
  padding-top: 4.2rem;
  padding-bottom: 3.2rem;
}

.page-hero {
  padding-top: 4rem;
  padding-bottom: 2rem;
}

.eyebrow {
  margin: 0 0 1rem;
  color: var(--vermilion);
  font-size: 0.84rem;
  font-weight: 700;
  letter-spacing: 0;
}

h1,
h2,
h3 {
  letter-spacing: 0;
  line-height: 1.08;
}

h1 {
  margin: 0;
  max-width: 920px;
  font-size: 4.4rem;
  font-weight: 800;
}

h2 {
  margin: 0 0 1rem;
  font-size: 2.35rem;
}

h3 {
  margin: 0;
  font-size: 1.35rem;
}

.lead {
  max-width: 760px;
  margin: 1.2rem 0 0;
  color: #34312c;
  font-size: 1.17rem;
  line-height: 1.78;
}

.hero-meta {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 0.7rem;
  margin-top: 1.9rem;
}

.metric,
.route-fact,
.mini-card {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 8px;
}

.metric {
  padding: 0.78rem 0.86rem;
}

.metric strong {
  display: block;
  color: var(--pine);
  font-size: 1.15rem;
}

.metric span {
  color: var(--muted);
  font-size: 0.86rem;
}

.map-card {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 8px;
  box-shadow: var(--shadow);
  padding: 1rem;
}

.map-card h2 {
  margin-bottom: 0.2rem;
  font-size: 1.2rem;
}

.map-card p {
  margin: 0 0 0.8rem;
  color: var(--muted);
  font-size: 0.92rem;
}

.route-map {
  display: block;
  width: 100%;
  height: auto;
  border-radius: 6px;
  background: #f6f7f0;
}

.route-map text {
  font-family: "Yu Mincho", "Hiragino Mincho ProN", Georgia, serif;
  letter-spacing: 0;
}

.section {
  padding-top: 2.7rem;
  padding-bottom: 2.7rem;
}

.section.band {
  max-width: none;
  background: var(--wash);
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  margin-top: 1rem;
}

.section.band > .inner {
  max-width: 1180px;
  margin: 0 auto;
  padding-left: 1.25rem;
  padding-right: 1.25rem;
}

.section-label {
  margin: 0 0 0.65rem;
  color: var(--muted);
  font-size: 0.88rem;
  font-weight: 700;
}

.split {
  display: grid;
  grid-template-columns: minmax(0, 0.78fr) minmax(320px, 0.62fr);
  gap: 2rem;
  align-items: start;
}

.prose p {
  margin: 0 0 1rem;
}

.prose p:last-child {
  margin-bottom: 0;
}

.callout {
  background: var(--panel);
  border: 1px solid var(--line);
  border-left: 4px solid var(--vermilion);
  border-radius: 8px;
  padding: 1rem 1.1rem;
}

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

.card-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1rem;
}

.topic-card {
  display: flex;
  min-height: 220px;
  flex-direction: column;
  justify-content: space-between;
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 1.1rem;
  text-decoration: none;
}

.topic-card:hover {
  border-color: rgba(157, 47, 34, 0.55);
  box-shadow: var(--shadow);
}

.topic-card p {
  color: var(--muted);
  margin: 0.75rem 0 1.2rem;
}

.topic-card span {
  color: var(--vermilion);
  font-weight: 700;
}

.data-panel {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 8px;
  box-shadow: var(--shadow);
  overflow: hidden;
}

.data-panel header {
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  padding: 1rem 1.1rem;
  border-bottom: 1px solid var(--line);
  background: #f7f9f5;
}

.data-panel header p {
  margin: 0;
  color: var(--muted);
  font-size: 0.9rem;
}

.data-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.96rem;
}

.data-table th,
.data-table td {
  vertical-align: top;
  border-bottom: 1px solid var(--line);
  padding: 0.82rem 0.9rem;
  text-align: left;
}

.data-table th {
  width: 21%;
  color: var(--pine);
  font-weight: 800;
}

.data-table tr:last-child th,
.data-table tr:last-child td {
  border-bottom: 0;
}

.archive-note,
.source-note {
  background: #f7f9f5;
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 1rem 1.1rem;
}

.source-note {
  margin-top: 1rem;
  color: var(--muted);
  font-size: 0.92rem;
}

.archive-note p {
  margin: 0.35rem 0 0;
  color: var(--muted);
}

.excerpt-list {
  display: grid;
  gap: 1.4rem;
}

.excerpt-card {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 8px;
  box-shadow: var(--shadow);
  overflow: hidden;
}

.excerpt-head {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 1rem;
  align-items: start;
  padding: 1.1rem 1.15rem;
  border-top: 4px solid var(--pine);
  border-bottom: 1px solid var(--line);
}

.excerpt-card.bridge .excerpt-head {
  border-top-color: var(--vermilion);
}

.excerpt-card.gate .excerpt-head {
  border-top-color: var(--gold);
}

.excerpt-card.water .excerpt-head {
  border-top-color: var(--indigo);
}

.excerpt-card.disaster .excerpt-head {
  border-top-color: var(--plum);
}

.excerpt-head p {
  margin: 0.45rem 0 0;
  color: var(--muted);
  font-size: 0.93rem;
}

.citation {
  max-width: 220px;
  color: var(--muted);
  font-size: 0.82rem;
  line-height: 1.45;
  text-align: right;
}

.bilingual {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
}

.text-panel {
  padding: 1.15rem;
}

.text-panel + .text-panel {
  border-left: 1px solid var(--line);
}

.lang-label {
  display: inline-flex;
  margin-bottom: 0.62rem;
  color: var(--pine);
  font-size: 0.78rem;
  font-weight: 800;
}

blockquote {
  margin: 0;
}

blockquote p {
  margin: 0 0 0.9rem;
}

blockquote p:last-child {
  margin-bottom: 0;
}

.jp {
  font-family: "Yu Mincho", "Hiragino Mincho ProN", "Noto Serif CJK JP",
    "Yu Gothic", serif;
  line-height: 1.86;
}

.annotations {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
  gap: 1px;
  background: var(--line);
  border-top: 1px solid var(--line);
}

.annotation {
  background: #fdfcf8;
  padding: 1rem 1.15rem;
}

.annotation h4 {
  margin: 0 0 0.42rem;
  color: var(--vermilion);
  font-size: 0.92rem;
}

.annotation p {
  margin: 0;
  color: var(--muted);
  font-size: 0.92rem;
}

.route-facts {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 1rem;
}

.route-fact {
  padding: 1rem;
}

.route-fact strong {
  display: block;
  color: var(--pine);
  font-size: 1.05rem;
}

.route-fact span {
  color: var(--muted);
  font-size: 0.92rem;
}

.ad-slate {
  max-width: 1180px;
  margin: 0 auto 1rem;
  padding: 0 1.25rem;
}

.ad-slate div {
  border: 1px dashed var(--line);
  border-radius: 8px;
  color: var(--muted);
  font-size: 0.82rem;
  padding: 0.65rem 0.8rem;
  text-align: center;
}

.site-footer {
  margin-top: 2rem;
  border-top: 1px solid var(--line);
  background: #f7f9f5;
}

.footer-inner {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 1rem;
  padding-top: 1.4rem;
  padding-bottom: 1.4rem;
  color: var(--muted);
  font-size: 0.9rem;
}

.footer-links {
  display: flex;
  flex-wrap: wrap;
  gap: 0.8rem;
}

@media (max-width: 900px) {
  body {
    font-size: 17px;
  }

  .hero,
  .split,
  .bilingual,
  .annotations,
  .route-facts {
    grid-template-columns: 1fr;
  }

  .hero {
    padding-top: 3rem;
  }

  h1 {
    font-size: 3.1rem;
  }

  h2 {
    font-size: 2rem;
  }

  .text-panel + .text-panel {
    border-left: 0;
    border-top: 1px solid var(--line);
  }

  .citation {
    max-width: none;
    text-align: left;
  }
}

@media (max-width: 680px) {
  .nav {
    align-items: flex-start;
    flex-direction: column;
  }

  .hero-meta,
  .card-grid {
    grid-template-columns: 1fr;
  }

  h1 {
    font-size: 2.35rem;
  }

  .lead {
    font-size: 1.05rem;
  }

  .data-panel header,
  .excerpt-head,
  .footer-inner {
    grid-template-columns: 1fr;
  }

  .data-table,
  .data-table tbody,
  .data-table tr,
  .data-table th,
  .data-table td {
    display: block;
    width: 100%;
  }

  .data-table th {
    border-bottom: 0;
    padding-bottom: 0.2rem;
  }

  .data-table td {
    padding-top: 0.2rem;
  }
}

@media print {
  body {
    background: #fff;
    color: #000;
    font-size: 11pt;
  }

  .site-header,
  .ad-slate {
    display: none;
  }

  .hero,
  .page-hero,
  .section,
  .section.band > .inner,
  .footer-inner {
    max-width: none;
    padding-left: 0;
    padding-right: 0;
  }

  .map-card,
  .data-panel,
  .excerpt-card {
    box-shadow: none;
    break-inside: avoid;
  }

  a {
    color: #000;
    text-decoration: underline;
  }
}