:root {
  --ink: #1f211c;
  --muted: #686c61;
  --paper: #f5f0e5;
  --paper-2: #ede3d2;
  --soil: #6b4b2f;
  --leaf: #2f5e4e;
  --gold: #b77a31;
  --deep: #17221d;
  --line: rgba(31, 33, 28, 0.16);
  --white: #fffdf7;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  color: var(--ink);
  background: var(--paper);
  font-family: "Noto Sans JP", system-ui, sans-serif;
  line-height: 1.85;
  letter-spacing: 0;
}

img {
  display: block;
  max-width: 100%;
}

a {
  color: inherit;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  padding: 14px clamp(18px, 4vw, 56px);
  background: rgba(245, 240, 229, 0.92);
  border-bottom: 1px solid var(--line);
  backdrop-filter: blur(16px);
}

.brand {
  font-family: "Noto Serif JP", serif;
  font-weight: 900;
  text-decoration: none;
}

.site-header nav {
  display: flex;
  gap: 18px;
  color: var(--muted);
  font-size: 14px;
  font-weight: 700;
}

.site-header nav a {
  text-decoration: none;
}

.hero {
  position: relative;
  min-height: 92vh;
  display: grid;
  align-items: center;
  padding: 96px clamp(18px, 5vw, 72px) 42px;
  overflow: hidden;
  color: var(--white);
  background: var(--deep);
}

.hero-media {
  position: absolute;
  inset: 0;
}

.hero-media::after {
  content: "";
  position: absolute;
  inset: 0;
  background:
    linear-gradient(90deg, rgba(15, 21, 18, 0.86), rgba(15, 21, 18, 0.45) 44%, rgba(15, 21, 18, 0.08) 74%),
    linear-gradient(0deg, rgba(15, 21, 18, 0.5), transparent 45%);
}

.hero-media img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: center;
}

.hero-content {
  position: relative;
  z-index: 1;
  max-width: 760px;
}

.eyebrow {
  margin: 0 0 12px;
  color: var(--gold);
  font-size: 13px;
  font-weight: 900;
  text-transform: uppercase;
  letter-spacing: 0.08em;
}

.hero h1,
.section h2 {
  margin: 0;
  font-family: "Noto Serif JP", serif;
  font-weight: 900;
  line-height: 1.16;
  text-wrap: balance;
}

.hero h1 {
  display: grid;
  gap: 6px;
  font-size: 82px;
}

.hero-lead {
  max-width: 650px;
  margin: 26px 0 0;
  font-size: 18px;
  color: rgba(255, 253, 247, 0.9);
  text-wrap: pretty;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 32px;
}

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 48px;
  padding: 12px 20px;
  border: 1px solid rgba(255, 253, 247, 0.32);
  border-radius: 4px;
  font-weight: 900;
  text-decoration: none;
}

.button.primary {
  color: #20170d;
  background: #e2b26d;
  border-color: #e2b26d;
}

.button.secondary {
  color: var(--white);
  background: rgba(255, 255, 255, 0.1);
}

.hero-note {
  position: absolute;
  right: clamp(18px, 4vw, 56px);
  bottom: 28px;
  z-index: 2;
  max-width: 360px;
  padding: 14px 16px;
  background: rgba(23, 34, 29, 0.72);
  border: 1px solid rgba(255, 255, 255, 0.2);
  border-radius: 8px;
  font-size: 13px;
}

.hero-note strong,
.hero-note span {
  display: block;
}

.section {
  padding: clamp(64px, 9vw, 124px) clamp(18px, 5vw, 72px);
}

.section-head {
  max-width: 880px;
  margin-bottom: 34px;
}

.section h2 {
  font-size: 58px;
}

.section-head p:not(.eyebrow),
.copy-block p {
  color: var(--muted);
  font-size: 17px;
  text-wrap: pretty;
}

.movie-section {
  color: var(--white);
  background: #050606;
}

.movie-section .section-head p:not(.eyebrow) {
  color: rgba(255, 253, 247, 0.72);
}

.movie-frame {
  margin: 0;
  overflow: hidden;
  border: 1px solid rgba(255, 253, 247, 0.16);
  border-radius: 8px;
  background: #000;
  box-shadow: 0 32px 88px rgba(0, 0, 0, 0.32);
}

.movie-frame video,
.movie-frame iframe {
  display: block;
  width: 100%;
  aspect-ratio: 16 / 9;
  border: 0;
  background: #000;
}

.movie-copy {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1px;
  margin-top: 18px;
  overflow: hidden;
  border: 1px solid rgba(255, 253, 247, 0.14);
  border-radius: 8px;
  background: rgba(255, 253, 247, 0.14);
}

.movie-copy p {
  min-height: 112px;
  padding: 20px;
  background: #101512;
  color: rgba(255, 253, 247, 0.86);
  font-family: "Noto Serif JP", serif;
  font-size: 22px;
  font-weight: 700;
  line-height: 1.55;
}

.now-feature {
  background:
    linear-gradient(180deg, #fffdf7, var(--paper));
}

.now-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.12fr) minmax(320px, 0.88fr);
  gap: clamp(24px, 4vw, 48px);
  align-items: stretch;
}

.photo-card {
  margin: 0;
  overflow: hidden;
  border-radius: 8px;
  background: var(--deep);
  box-shadow: 0 24px 70px rgba(57, 43, 25, 0.16);
}

.photo-card img {
  width: 100%;
  height: 100%;
  min-height: 540px;
  object-fit: cover;
  object-position: center;
}

.now-points {
  display: grid;
  gap: 14px;
}

.now-points article {
  padding: 24px;
  background: var(--white);
  border: 1px solid var(--line);
  border-radius: 8px;
}

.now-points span {
  display: inline-flex;
  margin-bottom: 14px;
  padding: 6px 10px;
  color: var(--white);
  background: var(--leaf);
  border-radius: 999px;
  font-size: 13px;
  font-weight: 900;
}

.now-points p {
  color: var(--muted);
}

.model-section {
  background: #edf0e8;
}

.model-layout {
  display: grid;
  grid-template-columns: minmax(0, 1.34fr) minmax(300px, 0.66fr);
  gap: clamp(22px, 4vw, 44px);
  align-items: stretch;
}

.model-card {
  margin: 0;
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #171b18;
  box-shadow: 0 26px 74px rgba(57, 43, 25, 0.18);
}

.model-card model-viewer {
  display: block;
  width: 100%;
  min-height: clamp(420px, 62vw, 680px);
  background:
    radial-gradient(circle at 42% 28%, rgba(255, 253, 247, 0.18), transparent 34%),
    linear-gradient(135deg, #2c302d, #151816 66%);
}

.model-fallback {
  width: 100%;
  height: 100%;
  min-height: 420px;
  object-fit: cover;
}

.model-points {
  display: grid;
  gap: 14px;
}

.model-points article {
  padding: 22px;
  background: var(--white);
  border: 1px solid var(--line);
  border-radius: 8px;
}

.model-points span {
  display: inline-flex;
  margin-bottom: 12px;
  padding: 6px 10px;
  color: var(--white);
  background: var(--soil);
  border-radius: 999px;
  font-size: 13px;
  font-weight: 900;
}

.model-points p {
  color: var(--muted);
}

.fact-board {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
}

.fact-board article {
  min-height: 300px;
  padding: 28px;
  background: var(--white);
}

.then-now {
  background: var(--paper-2);
}

.compare-panels {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 18px;
}

.fact-number {
  display: block;
  margin-bottom: 28px;
  color: var(--gold);
  font-family: "Noto Serif JP", serif;
  font-size: 36px;
  font-weight: 900;
}

h3 {
  margin: 0 0 12px;
  font-size: 21px;
  line-height: 1.35;
}

p {
  margin: 0;
}

.split {
  display: grid;
  grid-template-columns: minmax(0, 0.9fr) minmax(0, 1.1fr);
  gap: clamp(28px, 5vw, 70px);
  align-items: center;
  background: var(--white);
}

.split.reverse {
  grid-template-columns: minmax(0, 1.08fr) minmax(0, 0.92fr);
  background: var(--paper-2);
}

.copy-block h2 {
  margin-bottom: 20px;
}

.note-list {
  display: grid;
  gap: 8px;
  margin-top: 24px;
  color: var(--soil);
  font-size: 14px;
  font-weight: 700;
}

.image-panel {
  margin: 0;
  background: #151a16;
  border-radius: 8px;
  overflow: hidden;
  box-shadow: 0 24px 70px rgba(57, 43, 25, 0.18);
}

.image-panel img {
  width: 100%;
  aspect-ratio: 16 / 9;
  object-fit: cover;
}

figcaption {
  padding: 12px 14px;
  color: rgba(255, 253, 247, 0.78);
  background: #17221d;
  font-size: 13px;
  line-height: 1.6;
}

figcaption a {
  color: #e2b26d;
}

.visual-timeline {
  background: var(--deep);
  color: var(--white);
}

.visual-timeline .section-head p:not(.eyebrow) {
  color: rgba(255, 253, 247, 0.72);
}

.timeline {
  display: grid;
  grid-template-columns: repeat(6, 1fr);
  gap: 0;
  margin: 0;
  padding: 0;
  list-style: none;
  border: 1px solid rgba(255, 253, 247, 0.18);
}

.timeline li {
  position: relative;
  min-height: 300px;
  padding: 24px;
  border-right: 1px solid rgba(255, 253, 247, 0.18);
}

.timeline li:last-child {
  border-right: 0;
}

.timeline li::before {
  content: "";
  position: absolute;
  top: 32px;
  left: 24px;
  right: 24px;
  height: 4px;
  background: var(--gold);
}

.timeline time {
  display: block;
  margin: 32px 0 18px;
  color: #e2b26d;
  font-weight: 900;
}

.timeline strong {
  display: block;
  margin-bottom: 10px;
  font-size: 19px;
}

.timeline span {
  color: rgba(255, 253, 247, 0.72);
  font-size: 14px;
}

.era-stack {
  display: grid;
  gap: 12px;
  max-width: 1180px;
}

.era-row {
  display: grid;
  grid-template-columns: 170px 260px minmax(0, 1fr);
  gap: 22px;
  align-items: center;
  min-height: 96px;
  padding: 18px 22px;
  border: 1px solid rgba(255, 253, 247, 0.16);
  border-radius: 8px;
  background:
    linear-gradient(90deg, rgba(255, 253, 247, 0.1), rgba(255, 253, 247, 0.02)),
    var(--deep);
}

.era-row time {
  color: #e2b26d;
  font-family: "Noto Serif JP", serif;
  font-weight: 900;
}

.era-row strong {
  color: var(--white);
  font-size: 24px;
  line-height: 1.3;
}

.era-row span {
  color: rgba(255, 253, 247, 0.78);
}

.era-kofun { border-left: 12px solid #b9a16b; }
.era-road { border-left: 12px solid #667f54; }
.era-border { border-left: 12px solid #8d6a3d; }
.era-battle { border-left: 12px solid #b7603a; }
.era-park { border-left: 12px solid #d1b674; }

.battle {
  background: #fbf8f0;
}

.campaign-route {
  display: grid;
  grid-template-columns: minmax(0, 1.06fr) minmax(320px, 0.94fr);
  gap: 22px;
  align-items: stretch;
  margin: 28px 0 34px;
  padding: 22px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #f4eddf;
}

.campaign-illustration {
  min-height: 420px;
  overflow: hidden;
  border: 1px solid rgba(31, 33, 28, 0.12);
  border-radius: 8px;
  background: #f8f3e8;
}

.campaign-illustration svg {
  width: 100%;
  height: 100%;
  min-height: 420px;
  display: block;
}

.route-explain {
  display: grid;
  grid-template-rows: auto 1fr;
  gap: 16px;
}

.route-legend {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.route-legend span {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 10px;
  border-radius: 999px;
  background: var(--white);
  border: 1px solid var(--line);
  color: var(--ink);
  font-size: 13px;
  font-weight: 900;
}

.route-legend span::before {
  content: "";
  width: 24px;
  height: 5px;
  border-radius: 999px;
}

.legend-brown::before {
  background: #8a5e37;
}

.legend-green::before {
  background: #2f5e4e;
}

.route-steps {
  display: grid;
  gap: 12px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.route-steps li {
  display: grid;
  grid-template-columns: 44px minmax(0, 1fr);
  gap: 14px;
  align-items: start;
  padding: 18px;
  background: var(--white);
  border: 1px solid var(--line);
  border-radius: 8px;
}

.route-steps .route-highlight {
  border-color: rgba(183, 122, 49, 0.55);
  background: #fff6e6;
}

.route-step-no {
  display: grid;
  place-items: center;
  width: 44px;
  height: 44px;
  color: var(--white);
  background: var(--leaf);
  border-radius: 50%;
  font-family: "Noto Serif JP", serif;
  font-size: 19px;
  font-weight: 900;
}

.route-highlight .route-step-no {
  background: var(--gold);
}

.route-steps strong {
  display: block;
  margin-bottom: 6px;
  font-size: 19px;
  line-height: 1.35;
}

.route-steps p {
  color: var(--muted);
  font-size: 14px;
  line-height: 1.7;
}

.map-caption {
  grid-column: 1 / -1;
  margin: 0;
  padding: 12px 14px;
  color: var(--muted);
  background: rgba(255, 253, 247, 0.82);
  border: 1px solid var(--line);
  border-radius: 8px;
  font-size: 13px;
}

.battle-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.2fr) minmax(320px, 0.8fr);
  gap: 28px;
  align-items: stretch;
}

.battle-image {
  height: 100%;
}

.battle-image img {
  height: 100%;
  min-height: 520px;
}

.sequence {
  display: grid;
  gap: 12px;
}

.sequence article,
.cards article,
.caution {
  padding: 24px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--white);
}

.sequence article span {
  display: inline-grid;
  place-items: center;
  width: 38px;
  height: 38px;
  margin-bottom: 18px;
  color: var(--white);
  background: var(--leaf);
  border-radius: 50%;
  font-family: "Noto Serif JP", serif;
  font-weight: 900;
}

.sequence article p,
.cards article p,
.caution p {
  color: var(--muted);
}

.layer-cards {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 10px;
  margin-top: 28px;
}

.layer-cards div {
  padding: 18px;
  background: var(--white);
  border: 1px solid var(--line);
  border-radius: 8px;
}

.layer-cards strong,
.layer-cards span {
  display: block;
}

.layer-cards strong {
  color: var(--soil);
  font-family: "Noto Serif JP", serif;
  font-size: 23px;
}

.story-cards {
  background: var(--paper);
}

.cards {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 18px;
}

.source-screens {
  background: var(--deep);
  color: var(--white);
}

.source-screens .section-head p:not(.eyebrow) {
  color: rgba(255, 253, 247, 0.72);
}

.screenshot-grid {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 14px;
}

.screenshot-grid figure {
  display: grid;
  gap: 10px;
  align-content: start;
  margin: 0;
  overflow: hidden;
  border: 1px solid rgba(255, 253, 247, 0.16);
  border-radius: 8px;
  background: #101712;
  box-shadow: 0 18px 48px rgba(0, 0, 0, 0.18);
}

.source-thumb {
  display: block;
  margin: 10px 10px 0;
  overflow: hidden;
  border: 1px solid rgba(255, 253, 247, 0.14);
  border-radius: 6px;
  background: rgba(255, 253, 247, 0.06);
}

.screenshot-grid img {
  display: block;
  width: 100%;
  max-height: 92px;
  aspect-ratio: 16 / 9;
  object-fit: cover;
  object-position: top;
  opacity: 0.76;
  filter: saturate(0.72) contrast(0.96);
}

.screenshot-grid figcaption {
  display: grid;
  gap: 7px;
  padding: 0 12px 14px;
  background: transparent;
}

.screenshot-grid figcaption strong,
.screenshot-grid figcaption span,
.screenshot-grid figcaption a {
  display: block;
}

.screenshot-grid figcaption strong {
  color: var(--white);
  font-size: 14px;
}

.screenshot-grid figcaption span {
  color: rgba(255, 253, 247, 0.68);
}

.screenshot-grid figcaption a {
  color: #e2b26d;
  font-weight: 900;
}

.sources {
  background: var(--white);
}

.source-list {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 10px;
  margin-bottom: 28px;
}

.source-list a {
  padding: 16px 18px;
  color: var(--leaf);
  background: #f5f0e5;
  border: 1px solid var(--line);
  border-radius: 8px;
  font-weight: 700;
  text-decoration: none;
}

.source-list a:hover {
  border-color: rgba(188, 118, 31, 0.48);
  background: #f8f3e8;
}

.caution {
  border-left: 6px solid var(--gold);
}

.site-footer {
  padding: 24px clamp(18px, 5vw, 72px);
  color: rgba(255, 253, 247, 0.74);
  background: #111813;
  font-size: 13px;
}

.site-footer p {
  margin: 0;
}

.site-footer p + p {
  margin-top: 8px;
}

.site-footer a {
  color: #e2b26d;
}

@media (max-width: 1060px) {
  .hero h1 {
    font-size: 64px;
  }

  .section h2 {
    font-size: 46px;
  }

  .fact-board,
  .timeline,
  .era-row,
  .now-grid,
  .screenshot-grid,
  .movie-copy {
    grid-template-columns: repeat(2, 1fr);
  }

  .era-row {
    grid-template-columns: 1fr;
    gap: 8px;
  }

  .timeline li {
    border-bottom: 1px solid rgba(255, 253, 247, 0.18);
  }

  .split,
  .split.reverse,
  .now-grid,
  .model-layout,
  .compare-panels,
  .campaign-route,
  .battle-grid {
    grid-template-columns: 1fr;
  }

  .battle-image img {
    min-height: auto;
  }

  .photo-card img {
    min-height: auto;
  }

  .model-card model-viewer {
    min-height: 520px;
  }
}

@media (max-width: 720px) {
  .site-header {
    align-items: flex-start;
    flex-direction: column;
    gap: 8px;
    padding: 12px 16px;
  }

  .site-header nav {
    width: 100%;
    overflow-x: auto;
    padding-bottom: 2px;
  }

  .hero {
    min-height: auto;
    padding: 330px 18px 28px;
  }

  .hero-media {
    height: 470px;
    bottom: auto;
  }

  .hero-media::after {
    background:
      linear-gradient(180deg, rgba(15, 21, 18, 0.02), rgba(15, 21, 18, 0.2) 32%, rgba(15, 21, 18, 0.88)),
      linear-gradient(90deg, rgba(15, 21, 18, 0.1), transparent 72%);
  }

  .hero-media img {
    object-position: 72% top;
  }

  .hero-content {
    align-self: end;
    max-width: none;
  }

  .hero h1 {
    font-size: 39px;
    text-shadow: 0 3px 18px rgba(0, 0, 0, 0.4);
  }

  .section h2 {
    font-size: 34px;
  }

  .hero-lead {
    font-size: 16px;
  }

  .hero-actions {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 10px;
    margin-top: 24px;
  }

  .button {
    min-height: 52px;
    padding: 10px 12px;
    font-size: 14px;
  }

  .hero-note {
    position: relative;
    left: auto;
    right: auto;
    bottom: auto;
    max-width: none;
    margin-top: 18px;
  }

  .section {
    padding: 64px 18px;
  }

  .fact-board,
  .timeline,
  .era-row,
  .cards,
  .layer-cards,
  .source-list,
  .screenshot-grid,
  .movie-copy {
    grid-template-columns: 1fr;
  }

  .movie-copy p {
    min-height: auto;
    font-size: 18px;
  }

  .model-card model-viewer {
    min-height: 380px;
  }

  .fact-board article,
  .timeline li {
    min-height: auto;
  }

  .campaign-route {
    gap: 14px;
    padding: 14px;
  }

  .campaign-illustration,
  .campaign-illustration svg {
    min-height: 260px;
  }

  .route-legend {
    gap: 8px;
  }

  .route-legend span {
    width: 100%;
    justify-content: flex-start;
  }

  .route-steps li {
    grid-template-columns: 38px minmax(0, 1fr);
    gap: 12px;
    padding: 16px;
  }

  .route-step-no {
    width: 38px;
    height: 38px;
    font-size: 17px;
  }

  .route-steps strong {
    font-size: 17px;
  }
}