:root {
  --paper: #f7f1e3;
  --paper-deep: #e7d6b8;
  --ink: #241b15;
  --ink-soft: rgba(36, 27, 21, 0.72);
  --tea: #4b3a29;
  --pine: #2f5b4f;
  --river: #486f86;
  --sand: #bf9a67;
  --earth: #8f5f3f;
  --night: #101816;
  --snow: #d9dde0;
  --gold: #d4af37;
  --seal: #c9473d;
  --white: #fff8e8;
  --shadow: 0 30px 90px rgba(24, 17, 11, 0.26);
  --soft-shadow: 0 18px 50px rgba(24, 17, 11, 0.16);
  font-family: "Microsoft YaHei", "PingFang SC", "Noto Sans SC", Arial, sans-serif;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  color: var(--ink);
  background: #17110d;
  overflow-x: hidden;
  text-rendering: optimizeLegibility;
  -webkit-font-smoothing: antialiased;
}

button,
a {
  font: inherit;
}

button {
  cursor: pointer;
}

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

.grain {
  position: fixed;
  inset: 0;
  z-index: 30;
  pointer-events: none;
  opacity: 0.16;
  mix-blend-mode: multiply;
  background-image:
    radial-gradient(circle at 18% 22%, rgba(0, 0, 0, 0.18) 0 1px, transparent 1px),
    radial-gradient(circle at 68% 72%, rgba(255, 255, 255, 0.32) 0 1px, transparent 1px);
  background-size: 5px 5px, 8px 8px;
}

.brand-mark {
  position: fixed;
  z-index: 44;
  top: 7vh;
  right: 3.8vw;
  padding: 0.72rem 0.46rem;
  color: var(--white);
  background: rgba(132, 38, 32, 0.9);
  box-shadow: 0 14px 32px rgba(0, 0, 0, 0.28);
  writing-mode: vertical-rl;
  letter-spacing: 8px;
  font-size: 1.42rem;
  font-weight: 800;
  line-height: 1;
  user-select: none;
}

.side-nav {
  position: fixed;
  z-index: 43;
  left: 3.2vw;
  top: 50%;
  transform: translateY(-50%);
  display: flex;
  flex-direction: column;
  gap: 0.16rem;
  max-height: 66vh;
  overflow-y: auto;
  scrollbar-width: none;
}

.side-nav::-webkit-scrollbar {
  display: none;
}

.side-nav a {
  display: grid;
  grid-template-columns: 2rem 1fr;
  align-items: center;
  gap: 0.45rem;
  min-width: 7.2rem;
  padding: 0.42rem 0.3rem 0.42rem 0.78rem;
  color: rgba(255, 248, 232, 0.5);
  border-left: 1px solid rgba(255, 248, 232, 0.22);
  text-decoration: none;
  font-size: 0.82rem;
  transition: color 180ms ease, border-color 180ms ease, transform 180ms ease;
}

.side-nav a span {
  color: inherit;
  font-family: Georgia, serif;
  font-size: 0.76rem;
}

.side-nav a.active,
.side-nav a:hover {
  color: var(--gold);
  border-color: var(--gold);
  transform: translateX(0.22rem);
}

body:not(.revealed) .side-nav {
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.7s ease;
}

body.revealed .side-nav {
  opacity: 1;
  transition: opacity 0.7s ease 0.5s;
}

.scroll-meter {
  position: fixed;
  z-index: 45;
  left: 0;
  top: 0;
  width: 100%;
  height: 3px;
  background: rgba(0, 0, 0, 0.22);
}

.scroll-meter span {
  display: block;
  width: 0;
  height: 100%;
  background: linear-gradient(90deg, var(--seal), var(--gold), var(--river));
  box-shadow: 0 0 16px rgba(212, 175, 55, 0.75);
}

.chapter {
  position: relative;
  min-height: 100vh;
  padding: 10vh 9vw 10vh 15vw;
  isolation: isolate;
  overflow: hidden;
}

.chapter::before {
  content: "";
  position: absolute;
  inset: 0;
  z-index: -3;
  pointer-events: none;
  background:
    linear-gradient(90deg, rgba(0, 0, 0, 0.24), transparent 23%, transparent 78%, rgba(0, 0, 0, 0.2)),
    radial-gradient(circle at 78% 18%, rgba(212, 175, 55, 0.13), transparent 32%);
}

.chapter::after {
  content: "";
  position: absolute;
  inset: 0;
  z-index: -2;
  pointer-events: none;
  opacity: 0.35;
  background:
    linear-gradient(120deg, transparent 0 44%, rgba(255, 248, 232, 0.12) 45%, transparent 46%),
    radial-gradient(circle at 12% 92%, rgba(0, 0, 0, 0.12), transparent 34%);
}

.chapter-light {
  background: var(--paper);
}

.chapter-warm {
  background:
    linear-gradient(90deg, #efe3ce 0 56%, #dcc49e 56% 100%);
}

.chapter-map {
  background:
    linear-gradient(135deg, rgba(47, 91, 79, 0.2), transparent 42%),
    #d6c7a4;
}

.chapter-blue {
  background:
    linear-gradient(135deg, rgba(72, 111, 134, 0.4), transparent 58%),
    #d9decf;
}

.chapter-sand {
  background:
    linear-gradient(180deg, #bb905e 0%, #c5a16f 58%, #e5c58e 100%);
}

.chapter-earth {
  background:
    linear-gradient(120deg, #c89c67, #8f5f3f);
}

.chapter-night {
  color: var(--white);
  background: var(--night);
}

.chapter-red {
  color: var(--white);
  background:
    linear-gradient(135deg, #3b1f1a 0%, #8c4f37 52%, #b57c54 100%);
}

.chapter-black {
  color: #f4ead8;
  background:
    radial-gradient(circle at 70% 28%, rgba(72, 111, 134, 0.28), transparent 32%),
    #101010;
}

.chapter-brown {
  color: #f8ead6;
  background:
    radial-gradient(circle at 72% 44%, rgba(201, 71, 61, 0.18), transparent 32%),
    linear-gradient(135deg, #2a1510, #463022);
}

.kicker {
  margin: 0 0 0.95rem;
  color: var(--seal);
  font-size: 0.82rem;
  font-weight: 800;
  letter-spacing: 0.1em;
}

.chapter-night .kicker,
.chapter-black .kicker,
.chapter-brown .kicker,
.chapter-red .kicker {
  color: var(--gold);
}

h1,
h2,
h3,
p {
  margin-top: 0;
}

h1 {
  margin-bottom: 1.05rem;
  font-family: "STSong", "SimSun", serif;
  font-size: 7.4rem;
  line-height: 0.86;
  letter-spacing: 0;
}

h2 {
  max-width: 12em;
  margin-bottom: 1.2rem;
  font-family: "STSong", "SimSun", serif;
  font-size: 4.15rem;
  line-height: 1.04;
  letter-spacing: 0;
}

h3 {
  font-family: "STSong", "SimSun", serif;
  font-size: 2.5rem;
  line-height: 1.08;
  letter-spacing: 0;
}

p {
  font-size: 1.08rem;
  line-height: 1.92;
}

.hero {
  display: flex;
  align-items: center;
}

.hero-bg {
  position: absolute;
  inset: 0;
  z-index: -4;
  background:
    linear-gradient(90deg, rgba(21, 14, 9, 0.82), rgba(21, 14, 9, 0.28) 48%, rgba(21, 14, 9, 0.64)),
    linear-gradient(0deg, rgba(21, 14, 9, 0.64), transparent 42%),
    url("assets/supp-desert-camels.jpeg") center / cover;
  transform: scale(1.02);
}

.scroll-wrap {
  position: absolute;
  left: 12vw;
  right: 9vw;
  top: 14vh;
  height: 70vh;
  overflow: hidden;
  transform: perspective(1100px) rotateX(4deg);
}

.scroll-paper {
  position: absolute;
  top: 0;
  bottom: 0;
  left: 50%;
  right: 50%;
  border-top: 1px solid rgba(91, 56, 29, 0.32);
  border-bottom: 1px solid rgba(91, 56, 29, 0.32);
  background:
    linear-gradient(90deg, rgba(100, 56, 24, 0.22), transparent 12%, transparent 88%, rgba(100, 56, 24, 0.22)),
    linear-gradient(120deg, rgba(255, 255, 255, 0.15), transparent 38%),
    repeating-linear-gradient(90deg, rgba(91, 56, 29, 0.08) 0 1px, transparent 1px 38px),
    rgba(234, 215, 183, 0.65);
  box-shadow: inset 0 0 90px rgba(69, 36, 18, 0.22), var(--shadow);
  transition: left 900ms cubic-bezier(0.2, 0.8, 0.2, 1), right 900ms cubic-bezier(0.2, 0.8, 0.2, 1);
}

.scroll-rod {
  position: absolute;
  top: 0;
  bottom: 0;
  width: 3rem;
  border-radius: 999px;
  background: linear-gradient(90deg, #2b160f, #8a5f36, #28150e);
  box-shadow: 0 18px 45px rgba(0, 0, 0, 0.35);
  transition: left 900ms cubic-bezier(0.2, 0.8, 0.2, 1), right 900ms cubic-bezier(0.2, 0.8, 0.2, 1);
}

.scroll-rod.left {
  left: calc(50% - 3rem);
}

.scroll-rod.right {
  right: calc(50% - 3rem);
}

.hero.unrolled .scroll-paper {
  left: 3rem;
  right: 3rem;
}

.hero.unrolled .scroll-rod.left {
  left: 0;
}

.hero.unrolled .scroll-rod.right {
  right: 0;
}

.hero-copy {
  position: relative;
  z-index: 2;
  width: min(820px, 76vw);
  color: var(--white);
  text-shadow: 0 2px 22px rgba(0, 0, 0, 0.48);
}

.hero .kicker,
.hero-copy h1,
.hero-copy .lead,
.hero-copy .hero-narrative,
.hero-copy .ghost-action,
.hero .chapter-nav,
.hero-stat {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.7s ease 0.25s, transform 0.7s ease 0.25s;
}

.hero.unrolled .kicker,
.hero.unrolled .hero-copy h1,
.hero.unrolled .hero-copy .lead,
.hero.unrolled .hero-copy .hero-narrative,
.hero.unrolled .hero-copy .ghost-action,
.hero.unrolled .chapter-nav,
.hero.unrolled .hero-stat {
  opacity: 1;
  transform: translateY(0);
}

.lead {
  max-width: 48rem;
  color: rgba(255, 248, 232, 0.88);
  font-size: 1.16rem;
}

.hero-narrative {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 0;
  max-width: 56rem;
  margin-top: 2rem;
  border-top: 1px solid rgba(255, 248, 232, 0.3);
  border-bottom: 1px solid rgba(255, 248, 232, 0.22);
}

.hero-narrative span {
  min-height: 7.2rem;
  padding: 1.15rem 1rem;
  color: rgba(255, 248, 232, 0.78);
  border-right: 1px solid rgba(255, 248, 232, 0.18);
  font-size: 0.95rem;
  line-height: 1.72;
}

.hero-narrative span:last-child {
  border-right: 0;
}

.hero-narrative b {
  display: block;
  margin-bottom: 0.32rem;
  color: var(--gold);
  font-family: Georgia, serif;
  font-size: 1.48rem;
  font-weight: 700;
}

.hero-actions {
  display: flex;
  gap: 0.8rem;
  align-items: center;
  flex-wrap: wrap;
  margin-top: 2rem;
}

.primary-action,
.ghost-action,
.video-action {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 3rem;
  padding: 0 1.3rem;
  border-radius: 0;
  text-decoration: none;
  transition: transform 180ms ease, background 180ms ease, color 180ms ease;
}

.primary-action {
  color: #21150d;
  border: 1px solid var(--gold);
  background: var(--gold);
  box-shadow: 0 14px 30px rgba(0, 0, 0, 0.26);
}

.ghost-action {
  color: var(--white);
  border: 1px solid rgba(255, 248, 232, 0.55);
  background: rgba(255, 248, 232, 0.08);
}

.primary-action:hover,
.ghost-action:hover,
.video-action:hover {
  transform: translateY(-2px);
}

.hero-stat {
  position: absolute;
  right: 12vw;
  bottom: 11vh;
  width: 13.5rem;
  padding: 1.2rem 0 1.1rem 1.1rem;
  color: var(--white);
  border-left: 3px solid var(--gold);
  background: linear-gradient(90deg, rgba(0, 0, 0, 0.24), transparent);
}

.hero-stat b {
  display: block;
  margin-bottom: 0.32rem;
  color: var(--gold);
  font-family: "STSong", "SimSun", serif;
  font-size: 2rem;
}

.hero-stat span {
  font-size: 0.92rem;
  line-height: 1.6;
}

.section-grid {
  min-height: 80vh;
  display: grid;
  grid-template-columns: minmax(300px, 0.88fr) minmax(380px, 1.12fr);
  gap: clamp(2.5rem, 5vw, 6rem);
  align-items: center;
}

.section-grid.reverse {
  grid-template-columns: minmax(380px, 1.14fr) minmax(300px, 0.86fr);
}

.copy-block {
  position: relative;
  z-index: 2;
  max-width: 39rem;
}

.copy-block p:not(.kicker),
.poster-copy p {
  color: var(--ink-soft);
}

.chapter-night .copy-block p:not(.kicker),
.chapter-black .copy-block p:not(.kicker),
.chapter-brown .copy-block p:not(.kicker),
.chapter-red .copy-block p:not(.kicker),
.night-copy p:not(.kicker),
.legacy-copy p:not(.kicker),
.finale-copy p:not(.kicker) {
  color: rgba(255, 248, 232, 0.78);
}

.ledger-list {
  display: grid;
  gap: 0;
  margin: 2rem 0 0;
  padding: 0;
  border-top: 1px solid rgba(75, 58, 41, 0.28);
  border-bottom: 1px solid rgba(75, 58, 41, 0.18);
  list-style: none;
}

.ledger-list li {
  display: grid;
  grid-template-columns: 5.5rem 1fr;
  gap: 1rem;
  padding: 1rem 0;
  border-bottom: 1px solid rgba(75, 58, 41, 0.14);
}

.ledger-list li:last-child {
  border-bottom: 0;
}

.ledger-list b {
  color: var(--seal);
  font-size: 1rem;
}

.ledger-list span {
  color: rgba(36, 27, 21, 0.72);
  line-height: 1.72;
}

.parallax-stage {
  position: relative;
  min-height: 66vh;
  overflow: hidden;
  box-shadow: var(--shadow);
  background: #251a15;
}

.stage-bg {
  width: 100%;
  height: 66vh;
  object-fit: cover;
  filter: brightness(0.7) saturate(0.9);
  transition: transform 180ms ease;
}

.parallax-stage::after {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background:
    linear-gradient(90deg, rgba(37, 26, 21, 0.64), transparent 48%),
    radial-gradient(circle at 78% 18%, rgba(212, 175, 55, 0.12), transparent 28%);
}

.glass {
  background: rgba(247, 241, 227, 0.82);
  border: 1px solid rgba(255, 255, 255, 0.38);
  box-shadow: 0 20px 55px rgba(22, 16, 10, 0.24);
  backdrop-filter: blur(14px);
}

.ledger {
  position: absolute;
  z-index: 2;
  left: 8%;
  top: 11%;
  width: min(19rem, 52%);
  padding: 1.2rem;
  transition: transform 180ms ease;
}

.ledger span {
  display: block;
  margin-bottom: 0.3rem;
  color: var(--seal);
  font-size: 0.78rem;
  font-weight: 800;
}

.ledger strong {
  display: block;
  font-family: "STSong", "SimSun", serif;
  font-size: 2rem;
}

.ledger p {
  margin: 0.6rem 0 0;
  font-size: 0.92rem;
  line-height: 1.7;
}

.ticket-float {
  position: absolute;
  z-index: 2;
  right: 7%;
  bottom: 8%;
  width: min(17rem, 35%);
  transform: rotate(4deg);
  box-shadow: 0 22px 45px rgba(0, 0, 0, 0.36);
  transition: transform 180ms ease;
}

.route {
  padding-top: 10vh;
  padding-bottom: 12vh;
}

.route::before {
  background:
    linear-gradient(90deg, rgba(25, 42, 34, 0.26), transparent 26%, transparent 72%, rgba(50, 31, 18, 0.14)),
    radial-gradient(circle at 82% 18%, rgba(47, 91, 79, 0.22), transparent 34%);
}

.route::after {
  content: "";
  position: absolute;
  right: 5vw;
  top: 12vh;
  width: 43vw;
  height: 68vh;
  z-index: -1;
  opacity: 0.28;
  background: url("assets/supp-parchment.jpeg") center / cover;
  filter: sepia(0.25) saturate(0.9);
  transform: rotate(-2deg);
}

.route-intro {
  max-width: 62rem;
  margin-bottom: 3rem;
}

.route-summary {
  display: flex;
  align-items: center;
  gap: 0.7rem;
  width: min(660px, 82vw);
  margin-top: 1.6rem;
  color: var(--tea);
}

.route-summary span {
  min-width: 4.2rem;
  font-weight: 800;
}

.route-summary i {
  flex: 1;
  height: 1px;
  background: linear-gradient(90deg, var(--seal), rgba(201, 71, 61, 0.18));
}

.timeline {
  position: relative;
  display: grid;
  gap: 0.92rem;
  width: min(760px, 80vw);
  margin-left: clamp(0rem, 5vw, 7rem);
  padding-left: 3rem;
}

.timeline::before {
  content: "";
  position: absolute;
  left: 1.1rem;
  top: 0.6rem;
  width: 2px;
  height: calc(100% - 1.2rem);
  background: linear-gradient(var(--seal), rgba(201, 71, 61, 0.12));
  transform-origin: top;
  animation: inkGrow 1600ms ease both;
}

@keyframes inkGrow {
  from {
    transform: scaleY(0);
  }
  to {
    transform: scaleY(1);
  }
}

.station {
  position: relative;
  display: grid;
  grid-template-columns: 6.5rem 1fr;
  gap: 0.45rem 1.35rem;
  align-items: baseline;
  min-height: 5.2rem;
  padding: 1.05rem 4rem 1.05rem 1.15rem;
  color: var(--ink);
  text-align: left;
  border: 0;
  border-top: 1px solid rgba(75, 58, 41, 0.18);
  border-bottom: 1px solid rgba(255, 248, 232, 0.4);
  background:
    linear-gradient(90deg, rgba(247, 241, 227, 0.9), rgba(247, 241, 227, 0.54)),
    rgba(255, 248, 232, 0.56);
  box-shadow: var(--soft-shadow);
  transition: transform 180ms ease, box-shadow 180ms ease;
}

.station:hover,
.station.is-stamped {
  transform: translateX(0.35rem);
  box-shadow: 0 24px 60px rgba(54, 35, 20, 0.2);
}

.station::after {
  content: "印";
  position: absolute;
  right: 1.05rem;
  top: 0.85rem;
  width: 2.2rem;
  height: 2.2rem;
  display: grid;
  place-items: center;
  color: rgba(201, 71, 61, 0);
  border: 2px solid rgba(201, 71, 61, 0);
  transform: scale(1.65) rotate(-12deg);
  font-weight: 800;
  transition: color 180ms ease, border-color 180ms ease, transform 180ms ease;
}

.station.is-stamped::after {
  color: rgba(201, 71, 61, 0.9);
  border-color: rgba(201, 71, 61, 0.82);
  transform: scale(1) rotate(-12deg);
}

.dot {
  position: absolute;
  left: -2.82rem;
  top: 2.05rem;
  width: 1.05rem;
  height: 1.05rem;
  border-radius: 50%;
  background: var(--paper);
  border: 3px solid var(--seal);
  box-shadow: 0 0 0 8px rgba(201, 71, 61, 0.12);
}

.station small {
  color: var(--seal);
  font-weight: 800;
}

.station strong {
  font-family: "STSong", "SimSun", serif;
  font-size: 1.9rem;
}

.station em {
  grid-column: 2;
  color: rgba(36, 27, 21, 0.62);
  font-style: normal;
}

.route-drawer {
  position: fixed;
  z-index: 55;
  top: 0;
  right: 0;
  width: min(450px, 88vw);
  height: 100vh;
  padding: 5.6rem 2rem 2rem;
  color: var(--white);
  background:
    linear-gradient(180deg, rgba(31, 22, 15, 0.92), rgba(31, 22, 15, 0.82)),
    rgba(31, 22, 15, 0.9);
  border-left: 1px solid rgba(212, 175, 55, 0.3);
  box-shadow: -26px 0 80px rgba(0, 0, 0, 0.38);
  backdrop-filter: blur(18px);
  transform: translateX(110%);
  transition: transform 260ms ease;
}

.route-drawer.open {
  transform: translateX(0);
}

.route-drawer img {
  width: 100%;
  aspect-ratio: 4 / 3;
  object-fit: cover;
  margin-bottom: 1.4rem;
  border: 1px solid rgba(255, 248, 232, 0.22);
}

.drawer-close,
.modal-close {
  position: absolute;
  right: 1.2rem;
  top: 1.2rem;
  width: 2.4rem;
  height: 2.4rem;
  color: var(--white);
  border: 1px solid rgba(255, 248, 232, 0.34);
  border-radius: 0;
  background: rgba(255, 255, 255, 0.08);
}

.drawer-kicker {
  margin: 0 0 0.2rem;
  color: var(--gold);
  font-size: 0.78rem;
  font-weight: 800;
  letter-spacing: 0.1em;
}

.route-drawer p:not(.drawer-kicker) {
  color: rgba(255, 248, 232, 0.8);
}

.cargo-visual {
  position: relative;
  min-height: 60vh;
  overflow: hidden;
  box-shadow: var(--shadow);
  background: #d5dddf;
}

.cargo-visual::after {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background:
    linear-gradient(90deg, rgba(15, 37, 50, 0.18), transparent 42%),
    linear-gradient(0deg, rgba(15, 37, 50, 0.34), transparent 54%);
}

.cargo-visual img {
  width: 100%;
  height: 60vh;
  object-fit: cover;
  filter: saturate(0.88) contrast(0.96);
  animation: breatheImage 8s ease-in-out infinite;
}

.cargo-visual img.cargo-token {
  position: absolute;
  z-index: 2;
  right: 5%;
  bottom: 6%;
  width: min(230px, 31%);
  height: auto;
  aspect-ratio: 4 / 3;
  object-fit: cover;
  border: 1px solid rgba(255, 250, 239, 0.7);
  box-shadow: 0 18px 45px rgba(0, 0, 0, 0.26);
  animation: none;
}

@keyframes breatheImage {
  0%,
  100% {
    transform: scale(1.015);
  }
  50% {
    transform: scale(1.055);
  }
}

.hotspot {
  position: absolute;
  z-index: 4;
  width: 3rem;
  height: 3rem;
  border: 0;
  border-radius: 50%;
  background: transparent;
}

.hotspot span {
  position: absolute;
  inset: 0.82rem;
  border-radius: 50%;
  background: var(--seal);
  box-shadow: 0 0 0 0 rgba(201, 71, 61, 0.5);
  animation: pulse 1.6s ease-out infinite;
}

@keyframes pulse {
  to {
    box-shadow: 0 0 0 1.1rem rgba(201, 71, 61, 0);
  }
}

.hotspot i {
  position: absolute;
  left: 50%;
  bottom: calc(100% + 0.7rem);
  min-width: 10.5rem;
  padding: 0.8rem 0.95rem;
  color: #21150d;
  font-style: normal;
  font-weight: 800;
  background: rgba(255, 250, 239, 0.94);
  border: 1px solid rgba(83, 53, 31, 0.18);
  box-shadow: 0 18px 45px rgba(0, 0, 0, 0.22);
  transform: translate(-50%, 0.55rem) scale(0.94);
  opacity: 0;
  pointer-events: none;
  transition: opacity 180ms ease, transform 180ms ease;
}

.hotspot:hover i,
.hotspot:focus-visible i {
  opacity: 1;
  transform: translate(-50%, 0) scale(1);
}

.hot-a {
  left: 58%;
  top: 54%;
}

.hot-b {
  left: 74%;
  top: 36%;
}

.cargo-facts,
.legacy-metrics {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 0;
  margin-top: 1.7rem;
  border-top: 1px solid rgba(36, 27, 21, 0.2);
  border-bottom: 1px solid rgba(36, 27, 21, 0.12);
}

.cargo-facts span,
.legacy-metrics span {
  padding: 1rem 1.1rem;
  border-right: 1px solid rgba(36, 27, 21, 0.12);
  color: rgba(36, 27, 21, 0.72);
  line-height: 1.62;
}

.cargo-facts span:last-child,
.legacy-metrics span:last-child {
  border-right: 0;
}

.cargo-facts b,
.legacy-metrics b {
  display: block;
  color: var(--seal);
  font-family: Georgia, serif;
  font-size: 1.42rem;
}

.wide-poster {
  position: relative;
  height: 60vh;
  min-height: 390px;
  overflow: hidden;
  margin: -1vh -2vw 4.5vh 0;
  box-shadow: var(--shadow);
}

.wide-poster img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  filter: sepia(0.05) saturate(0.95) contrast(0.95);
  transform: scale(1.03);
}

.wide-poster::after {
  content: "";
  position: absolute;
  inset: 44% 0 0;
  background: linear-gradient(transparent, rgba(191, 154, 103, 0.82) 70%, #e5c58e);
}

.dust-layer {
  position: absolute;
  inset: 0;
  background:
    radial-gradient(circle at 20% 60%, rgba(255, 235, 192, 0.34) 0 2px, transparent 3px),
    radial-gradient(circle at 66% 45%, rgba(255, 235, 192, 0.25) 0 1px, transparent 2px);
  background-size: 130px 80px, 90px 70px;
  animation: dustMove 8s linear infinite;
}

@keyframes dustMove {
  to {
    background-position: -260px 60px, -180px 20px;
  }
}

.camel-strip {
  position: absolute;
  left: 0;
  right: 0;
  bottom: 11%;
  width: 210%;
  height: 5.6rem;
  background: url("assets/supp-camel-strip.png") repeat-x left center / auto 5.6rem;
  animation: camelWalk 16s linear infinite;
  mix-blend-mode: multiply;
  opacity: 0.72;
}

@keyframes camelWalk {
  from {
    transform: translateX(8%);
  }
  to {
    transform: translateX(-45%);
  }
}

.poster-copy {
  max-width: 60rem;
}

.poster-copy p {
  max-width: 56rem;
}

.gate-scene {
  position: relative;
  height: 64vh;
  min-height: 450px;
  overflow: hidden;
  background: #4f3424;
  box-shadow: var(--shadow);
}

.gate-scene img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  filter: sepia(0.28) brightness(0.84);
  transform: scale(1.18);
  transition: filter 450ms ease, transform 4s ease;
}

.gate-scene:hover img {
  filter: sepia(0.45) brightness(0.55);
  transform: scale(1.08);
}

.gate-arch {
  position: absolute;
  inset: 7% 20% 0;
  border: 2rem solid rgba(49, 30, 19, 0.78);
  border-bottom: 0;
  border-radius: 46% 46% 0 0;
  box-shadow: inset 0 0 80px rgba(0, 0, 0, 0.62), 0 0 0 999px rgba(49, 30, 19, 0.18);
}

.leaving-camels {
  position: absolute;
  left: 40%;
  bottom: 24%;
  width: 15rem;
  height: 3rem;
  background: url("assets/supp-camel-strip.png") repeat-x left center / auto 3rem;
  filter: brightness(0) sepia(1) saturate(0.2);
  opacity: 0.42;
  mix-blend-mode: multiply;
  transition: transform 4s ease, opacity 4s ease;
}

.gate-scene:hover .leaving-camels {
  transform: translate(7rem, -7rem) scale(0.35);
  opacity: 0.1;
}

.grassland {
  display: grid;
  place-items: center;
  text-align: center;
}

.stars {
  position: absolute;
  inset: 0;
  background-image:
    radial-gradient(circle, rgba(255, 255, 255, 0.95) 0 1px, transparent 1.2px),
    radial-gradient(circle, rgba(212, 175, 55, 0.65) 0 1px, transparent 1.2px);
  background-size: 110px 90px, 170px 130px;
  opacity: 0.48;
  transition: transform 140ms ease;
}

.grassland::after {
  content: "";
  position: absolute;
  inset: 0;
  z-index: -1;
  background:
    linear-gradient(rgba(16, 24, 22, 0.5), rgba(16, 24, 22, 0.86)),
    url("assets/supp-stars.jpeg") center / cover;
  opacity: 0.88;
}

.stars-two {
  background-size: 210px 160px, 260px 220px;
  filter: blur(0.4px);
  opacity: 0.3;
}

.night-copy {
  position: relative;
  z-index: 2;
  width: min(820px, 78vw);
  margin-top: -12vh;
}

.night-copy p {
  max-width: 46rem;
  margin-left: auto;
  margin-right: auto;
}

.camp {
  position: absolute;
  left: 50%;
  bottom: 11vh;
  transform: translateX(-50%);
}

.fire {
  position: relative;
  width: 6rem;
  height: 6rem;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(255, 214, 95, 0.8), rgba(201, 71, 61, 0.3) 36%, transparent 68%);
  box-shadow: 0 0 45px rgba(212, 175, 55, 0.65), 0 0 120px rgba(201, 71, 61, 0.45);
  animation: fireBreathe 1.2s ease-in-out infinite alternate;
}

.fire span {
  position: absolute;
  left: 50%;
  top: 45%;
  width: 1.6rem;
  height: 3.2rem;
  border-radius: 999px;
  background: linear-gradient(#fff0a8, var(--seal));
  transform: translate(-50%, -50%) rotate(12deg);
  filter: blur(0.4px);
}

@keyframes fireBreathe {
  from {
    transform: scale(0.92);
  }
  to {
    transform: scale(1.08);
  }
}

.camp-shadow {
  position: absolute;
  left: 50%;
  top: 72%;
  width: 42vw;
  height: 4rem;
  border-radius: 50%;
  background: radial-gradient(ellipse, rgba(0, 0, 0, 0.5), transparent 70%);
  transform: translateX(-50%);
}

.market-panel {
  position: relative;
  min-height: 62vh;
  overflow: hidden;
  box-shadow: var(--shadow);
  background: #4b2c1f;
}

.market-panel img {
  width: 100%;
  height: 62vh;
  object-fit: cover;
  filter: sepia(0.12) saturate(0.96) brightness(0.78);
}

.market-panel::after {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background:
    linear-gradient(90deg, rgba(0, 0, 0, 0.24), transparent 50%, rgba(0, 0, 0, 0.16)),
    radial-gradient(circle at 68% 28%, rgba(212, 175, 55, 0.14), transparent 30%);
}

.trade-point {
  position: absolute;
  z-index: 4;
  width: 5.4rem;
  height: 5.4rem;
  border-radius: 50%;
  color: var(--white);
  border: 1px solid rgba(255, 248, 232, 0.6);
  background: rgba(201, 71, 61, 0.58);
  box-shadow: 0 0 0 0 rgba(201, 71, 61, 0.52);
  animation: pulse 1.8s ease-out infinite;
}

.trade-point span {
  font-weight: 800;
}

.point-cn {
  left: 24%;
  top: 48%;
}

.point-ru {
  right: 22%;
  top: 28%;
}

.trade-card {
  position: absolute;
  z-index: 5;
  width: min(17rem, 38%);
  padding: 1rem;
  color: #21150d;
  background: rgba(255, 250, 239, 0.9);
  border: 1px solid rgba(255, 255, 255, 0.48);
  box-shadow: 0 18px 45px rgba(0, 0, 0, 0.24);
  backdrop-filter: blur(12px);
  opacity: 0;
  transform: translateY(0.6rem);
  pointer-events: none;
  transition: opacity 180ms ease, transform 180ms ease;
}

.trade-card b {
  color: var(--seal);
}

.trade-card p {
  margin: 0.3rem 0 0;
  font-size: 0.92rem;
  line-height: 1.65;
}

.cn-card {
  left: 8%;
  bottom: 10%;
}

.ru-card {
  right: 8%;
  top: 10%;
}

.market-panel.show-cn .cn-card,
.market-panel.show-ru .ru-card,
.trade-point:hover + .trade-card {
  opacity: 1;
  transform: translateY(0);
}

.data-row {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 0;
  margin-top: 1.8rem;
  border-top: 1px solid rgba(255, 248, 232, 0.22);
  border-bottom: 1px solid rgba(255, 248, 232, 0.14);
}

.data-row span {
  padding: 1rem 1.05rem;
  color: rgba(255, 248, 232, 0.78);
  border-right: 1px solid rgba(255, 248, 232, 0.14);
}

.data-row span:last-child {
  border-right: 0;
}

.data-row b {
  display: block;
  color: var(--gold);
  font-family: Georgia, serif;
  font-size: 1.5rem;
}

.legacy {
  display: grid;
  grid-template-columns: minmax(430px, 1fr) minmax(320px, 0.55fr);
  gap: 4rem;
  align-items: center;
}

.compare {
  position: relative;
  height: 72vh;
  min-height: 500px;
  overflow: hidden;
  box-shadow: 0 30px 90px rgba(0, 0, 0, 0.5);
  background: #000;
  user-select: none;
}

.compare img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.compare-base,
.compare-overlay {
  position: absolute;
  inset: 0;
}

.compare-base img {
  filter: sepia(0.2) brightness(0.72);
}

.compare-overlay {
  width: 50%;
  overflow: hidden;
}

.compare-overlay img {
  width: calc(100vw - 15vw - 4rem);
  max-width: none;
  filter: contrast(1.08) brightness(0.78) saturate(0.9);
}

.compare-handle {
  position: absolute;
  left: 50%;
  top: 0;
  bottom: 0;
  width: 3rem;
  transform: translateX(-50%);
  border: 0;
  background: transparent;
}

.compare-handle::before {
  content: "";
  position: absolute;
  left: 50%;
  top: 0;
  bottom: 0;
  width: 3px;
  transform: translateX(-50%);
  background: var(--gold);
  box-shadow: 0 0 18px rgba(212, 175, 55, 0.9);
}

.compare-handle span {
  position: absolute;
  left: 50%;
  top: 50%;
  width: 3.5rem;
  height: 3.5rem;
  border-radius: 50%;
  transform: translate(-50%, -50%);
  background: var(--gold);
  box-shadow: 0 0 30px rgba(212, 175, 55, 0.62);
}

.compare-handle span::before,
.compare-handle span::after {
  content: "";
  position: absolute;
  top: 50%;
  width: 0.65rem;
  height: 0.65rem;
  border-left: 2px solid #21150d;
  border-bottom: 2px solid #21150d;
}

.compare-handle span::before {
  left: 0.76rem;
  transform: translateY(-50%) rotate(45deg);
}

.compare-handle span::after {
  right: 0.76rem;
  transform: translateY(-50%) rotate(-135deg);
}

.compare-label {
  position: absolute;
  top: 1.2rem;
  padding: 0.7rem 1rem;
  color: var(--white);
  background: rgba(0, 0, 0, 0.44);
  border: 1px solid rgba(255, 248, 232, 0.28);
  backdrop-filter: blur(8px);
}

.ancient {
  left: 1.2rem;
}

.modern {
  right: 1.2rem;
}

.legacy-metrics {
  border-top-color: rgba(255, 248, 232, 0.2);
  border-bottom-color: rgba(255, 248, 232, 0.12);
}

.legacy-metrics span {
  color: rgba(255, 248, 232, 0.78);
  border-right-color: rgba(255, 248, 232, 0.12);
}

.legacy-metrics b {
  color: var(--gold);
}

.inline-video-card {
  margin-top: 1.4rem;
  padding: 0;
  border: 1px solid rgba(212, 175, 55, 0.28);
  background: rgba(255, 248, 232, 0.06);
  box-shadow: 0 18px 55px rgba(0, 0, 0, 0.22);
}

.inline-video-card video {
  width: 100%;
  max-height: 210px;
  object-fit: cover;
  background: #000;
}

.video-action {
  width: 100%;
  margin-top: 0;
  color: #21150d;
  font-weight: 800;
  border: 1px solid var(--gold);
  background: var(--gold);
}

.finale {
  display: grid;
  grid-template-columns: minmax(330px, 0.78fr) minmax(370px, 1fr);
  gap: 4rem;
  align-items: center;
}

.seal-stage {
  position: relative;
  min-height: 60vh;
  display: grid;
  place-items: center;
}

.seal-stage::before {
  content: "";
  position: absolute;
  width: min(46vw, 34rem);
  aspect-ratio: 1;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(212, 175, 55, 0.18), transparent 62%);
}

.seal-slot {
  position: relative;
  width: min(30vw, 20rem);
  min-width: 15rem;
  aspect-ratio: 1;
  display: grid;
  place-items: center;
  color: rgba(201, 71, 61, 0);
  border: 2px dashed rgba(212, 175, 55, 0.58);
  border-radius: 0;
  background:
    radial-gradient(circle, rgba(212, 175, 55, 0.12), transparent 68%),
    rgba(0, 0, 0, 0.12);
  box-shadow: 0 0 40px rgba(212, 175, 55, 0.16), inset 0 0 34px rgba(212, 175, 55, 0.08);
  animation: sealSlot 1.8s ease-in-out infinite alternate;
}

@keyframes sealSlot {
  from {
    box-shadow: 0 0 28px rgba(212, 175, 55, 0.12), inset 0 0 26px rgba(212, 175, 55, 0.08);
  }
  to {
    box-shadow: 0 0 70px rgba(212, 175, 55, 0.34), inset 0 0 44px rgba(212, 175, 55, 0.16);
  }
}

.seal-text {
  display: grid;
  place-items: center;
  width: 74%;
  height: 74%;
  border: 0.7rem solid currentColor;
  color: inherit;
  font-family: "STSong", "SimSun", serif;
  font-size: 5.8rem;
  font-weight: 900;
  letter-spacing: 0;
  transform: translateY(-9rem) scale(1.6) rotate(-10deg);
  opacity: 0;
}

.seal-slot.stamped .seal-text {
  color: rgba(201, 71, 61, 0.9);
  opacity: 1;
  animation: stampDown 520ms cubic-bezier(0.15, 0.9, 0.2, 1.15) both;
}

@keyframes stampDown {
  0% {
    transform: translateY(-10rem) scale(1.7) rotate(-10deg);
    filter: blur(1px);
  }
  70% {
    transform: translateY(0.4rem) scale(0.92) rotate(-5deg);
  }
  100% {
    transform: translateY(0) scale(1) rotate(-5deg);
    filter: blur(0);
  }
}

.modal {
  position: fixed;
  inset: 0;
  z-index: 80;
  display: grid;
  place-items: center;
  padding: 1.5rem;
  background: rgba(0, 0, 0, 0.68);
  opacity: 0;
  pointer-events: none;
  transition: opacity 180ms ease;
}

.modal.open {
  opacity: 1;
  pointer-events: auto;
}

.modal-panel {
  position: relative;
  width: min(920px, 94vw);
  max-height: 88vh;
  overflow: auto;
  padding: 3.5rem 1.4rem 1.4rem;
  color: var(--white);
  background: rgba(32, 19, 13, 0.94);
  border: 1px solid rgba(212, 175, 55, 0.32);
  box-shadow: 0 28px 90px rgba(0, 0, 0, 0.56);
}

.modal-content video,
.modal-content img {
  width: 100%;
  max-height: 68vh;
  object-fit: contain;
  background: #000;
}

.modal-content h3 {
  margin: 0.7rem 0;
}

.modal-content p {
  color: rgba(248, 234, 214, 0.78);
}

@media (max-width: 1100px) {
  h1 {
    font-size: 6rem;
  }

  h2 {
    font-size: 3.4rem;
  }

  .chapter {
    padding: 8vh 6vw 8vh;
  }

  .brand-mark {
    top: 1rem;
    right: 1rem;
    font-size: 1.12rem;
    letter-spacing: 5px;
  }

  .side-nav {
    left: 0;
    right: 0;
    top: auto;
    bottom: 0;
    transform: none;
    flex-direction: row;
    gap: 0;
    max-height: none;
    overflow-x: auto;
    background: rgba(28, 17, 12, 0.88);
    backdrop-filter: blur(12px);
  }

  .side-nav a {
    grid-template-columns: 1fr;
    min-width: 5.8rem;
    padding: 0.62rem;
    text-align: center;
    border-left: 0;
    border-top: 1px solid rgba(255, 248, 232, 0.18);
  }

  .side-nav a.active {
    transform: none;
  }

  .section-grid,
  .section-grid.reverse,
  .legacy,
  .finale {
    grid-template-columns: 1fr;
  }

  .hero {
    align-items: end;
    padding-bottom: 18vh;
  }

  .hero-copy {
    width: 100%;
  }

  .hero-stat {
    display: none;
  }

  .scroll-wrap {
    left: 5vw;
    right: 5vw;
    height: 58vh;
  }

  .hero-narrative {
    grid-template-columns: 1fr;
  }

  .hero-narrative span {
    min-height: 0;
    border-right: 0;
    border-bottom: 1px solid rgba(255, 248, 232, 0.14);
  }

  .hero-narrative span:last-child {
    border-bottom: 0;
  }

  .timeline {
    width: 100%;
    margin-left: 0;
  }

  .compare-overlay img {
    width: 100vw;
  }
}

@media (max-width: 680px) {
  h1 {
    font-size: 4.15rem;
  }

  h2 {
    font-size: 2.48rem;
  }

  h3 {
    font-size: 2rem;
  }

  p {
    font-size: 1rem;
    line-height: 1.82;
  }

  .chapter {
    min-height: auto;
    padding-top: 6rem;
    padding-bottom: 7.5rem;
  }

  .hero {
    min-height: 100vh;
  }

  .parallax-stage,
  .stage-bg,
  .cargo-visual,
  .cargo-visual img,
  .market-panel,
  .market-panel img,
  .gate-scene,
  .compare {
    min-height: 340px;
    height: 48vh;
  }

  .wide-poster {
    min-height: 320px;
    height: 48vh;
  }

  .route-summary {
    width: 100%;
    gap: 0.4rem;
  }

  .route-summary span {
    min-width: auto;
    font-size: 0.9rem;
  }

  .station {
    grid-template-columns: 1fr;
    padding-right: 3.5rem;
  }

  .station em {
    grid-column: auto;
  }

  .ledger-list li {
    grid-template-columns: 1fr;
    gap: 0.3rem;
  }

  .ticket-float {
    width: 42%;
  }

  .ledger {
    width: 68%;
  }

  .cargo-facts,
  .legacy-metrics,
  .data-row {
    grid-template-columns: 1fr;
  }

  .cargo-facts span,
  .legacy-metrics span,
  .data-row span {
    border-right: 0;
    border-bottom: 1px solid rgba(36, 27, 21, 0.12);
  }

  .data-row span {
    border-bottom-color: rgba(255, 248, 232, 0.12);
  }

  .trade-card {
    width: 78%;
  }

  .seal-slot {
    min-width: 13rem;
  }

  .seal-text {
    font-size: 4.2rem;
  }
}

/* 章节导航按钮 */
.chapter-nav {
  position: absolute;
  left: 0;
  right: 0;
  bottom: 5vh;
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 0 9vw;
  z-index: 10;
}

.chapter-nav-first {
  justify-content: flex-end;
}

.chapter-nav-last {
  justify-content: flex-start;
}

.prev-chapter,
.next-chapter {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  min-height: 3rem;
  padding: 0.8rem 1.5rem;
  color: var(--ink);
  text-decoration: none;
  font-size: 1rem;
  font-weight: 700;
  border: 1px solid rgba(36, 27, 21, 0.3);
  background: rgba(255, 248, 232, 0.85);
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.15);
  transition: transform 180ms ease, background 180ms ease, color 180ms ease, box-shadow 180ms ease;
}

.prev-chapter:hover,
.next-chapter:hover {
  transform: translateY(-2px);
  color: var(--seal);
  border-color: var(--seal);
  background: rgba(255, 248, 232, 0.95);
  box-shadow: 0 12px 32px rgba(0, 0, 0, 0.2);
}

/* 深色背景章节的导航按钮 */
.chapter-nav-dark .prev-chapter,
.chapter-nav-dark .next-chapter {
  color: var(--white);
  border-color: rgba(255, 248, 232, 0.4);
  background: rgba(255, 248, 232, 0.12);
}

.chapter-nav-dark .prev-chapter:hover,
.chapter-nav-dark .next-chapter:hover {
  color: var(--gold);
  border-color: var(--gold);
  background: rgba(255, 248, 232, 0.18);
}

@media (max-width: 680px) {
  .chapter-nav {
    bottom: 3rem;
    padding: 0 4vw;
  }

  .prev-chapter,
  .next-chapter {
    min-height: 2.5rem;
    padding: 0.6rem 1rem;
    font-size: 0.9rem;
  }
}
}