:root {
  --ink: #090b0a;
  --lacquer: #15100c;
  --charcoal: #1c1d18;
  --paper: #f7ead0;
  --paper-soft: #e7d1a4;
  --muted: #b9a177;
  --gold: #d6a84f;
  --gold-bright: #f4d98d;
  --cinnabar: #b9472f;
  --jade: #4da58d;
  --teal: #264d4c;
  --line: rgba(244, 217, 141, 0.24);
  --glass: rgba(12, 12, 10, 0.68);
  --max: 1180px;
  --header: 70px;
  --font-display: "Kaiti SC", "STKaiti", "KaiTi", "Hannotate SC", "Songti SC", serif;
  --font-body: "Songti SC", "STSong", "Noto Serif CJK SC", "PingFang SC", serif;
  --font-ui: "PingFang SC", "Microsoft YaHei", sans-serif;
  color-scheme: dark;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  min-width: 320px;
  background:
    linear-gradient(90deg, rgba(214, 168, 79, 0.05) 1px, transparent 1px),
    linear-gradient(180deg, rgba(214, 168, 79, 0.04) 1px, transparent 1px),
    var(--ink);
  background-size: 52px 52px;
  color: var(--paper);
  font-family: var(--font-body);
  font-size: 15px;
  letter-spacing: 0;
}

body::before {
  position: fixed;
  inset: 0;
  z-index: -2;
  content: "";
  background:
    linear-gradient(180deg, rgba(9, 11, 10, 0.24), rgba(9, 11, 10, 0.92)),
    repeating-linear-gradient(
      115deg,
      rgba(214, 168, 79, 0.04) 0,
      rgba(214, 168, 79, 0.04) 1px,
      transparent 1px,
      transparent 18px
    );
}

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

a {
  color: inherit;
  text-decoration: none;
}

button,
a.button {
  font: inherit;
}

.scroll-progress {
  position: fixed;
  top: 0;
  left: 0;
  z-index: 80;
  width: 100%;
  height: 3px;
  transform: scaleX(0);
  transform-origin: left;
  background: linear-gradient(90deg, var(--cinnabar), var(--gold-bright), var(--jade));
}

.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 70;
  display: grid;
  grid-template-columns: auto minmax(0, 1fr) auto;
  gap: 18px;
  align-items: center;
  height: var(--header);
  padding: 0 clamp(16px, 3vw, 40px);
  border-bottom: 1px solid rgba(244, 217, 141, 0.12);
  background: rgba(9, 11, 10, 0.54);
  backdrop-filter: blur(18px);
  transition:
    background 220ms ease,
    height 220ms ease;
}

.site-header.is-scrolled {
  height: 60px;
  background: rgba(9, 11, 10, 0.86);
}

.brand-mark {
  display: grid;
  gap: 1px;
  min-width: 126px;
}

.brand-mark span {
  color: var(--gold-bright);
  font-family: var(--font-display);
  font-size: 18px;
  font-weight: 700;
  line-height: 1;
}

.brand-mark small {
  color: var(--muted);
  font-family: var(--font-ui);
  font-size: 10px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
}

.main-nav {
  display: flex;
  justify-content: center;
  gap: clamp(10px, 1.25vw, 18px);
  min-width: 0;
  color: rgba(247, 234, 208, 0.72);
  font-family: var(--font-ui);
  font-size: 13px;
}

.main-nav a {
  position: relative;
  padding: 10px 0;
  transition: color 180ms ease;
}

.main-nav a::after {
  position: absolute;
  left: 0;
  bottom: 3px;
  width: 100%;
  height: 1px;
  content: "";
  transform: scaleX(0);
  transform-origin: left;
  background: var(--gold);
  transition: transform 180ms ease;
}

.main-nav a:hover,
.main-nav a.is-active {
  color: var(--gold-bright);
}

.main-nav a.is-active::after {
  transform: scaleX(1);
}

.nav-cta,
.button,
.mini-button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 38px;
  padding: 0 16px;
  border: 1px solid rgba(244, 217, 141, 0.35);
  border-radius: 6px;
  color: var(--paper);
  background: rgba(214, 168, 79, 0.12);
  cursor: pointer;
  transition:
    transform 180ms ease,
    border-color 180ms ease,
    background 180ms ease;
}

.chapter-rail {
  position: fixed;
  left: 22px;
  top: 50%;
  z-index: 66;
  display: grid;
  gap: 12px;
  transform: translateY(-50%);
}

.chapter-rail button {
  position: relative;
  width: 9px;
  height: 9px;
  padding: 0;
  border: 1px solid rgba(244, 217, 141, 0.42);
  border-radius: 999px;
  background: rgba(9, 11, 10, 0.58);
  cursor: pointer;
  transition:
    width 180ms ease,
    background 180ms ease,
    border-color 180ms ease;
}

.chapter-rail button::after {
  position: absolute;
  left: 50%;
  top: 14px;
  width: 1px;
  height: 12px;
  content: "";
  transform: translateX(-50%);
  background: rgba(244, 217, 141, 0.18);
}

.chapter-rail button:last-child::after {
  display: none;
}

.chapter-rail button.active {
  width: 28px;
  border-color: rgba(244, 217, 141, 0.88);
  background: linear-gradient(90deg, var(--gold-bright), var(--gold));
}

.nav-cta:hover,
.button:hover,
.mini-button:hover {
  transform: translateY(-1px);
  border-color: rgba(244, 217, 141, 0.78);
  background: rgba(214, 168, 79, 0.2);
}

.button.primary {
  border-color: transparent;
  color: #1a1108;
  background: linear-gradient(135deg, var(--gold-bright), var(--gold));
  font-weight: 700;
}

.button.ghost {
  background: rgba(10, 10, 8, 0.34);
}

.hero {
  position: relative;
  isolation: isolate;
  display: grid;
  align-items: end;
  min-height: 100svh;
  padding: calc(var(--header) + 46px) clamp(20px, 5vw, 72px) 40px;
  overflow: hidden;
  border-bottom: 1px solid var(--line);
}

.hero-media,
.hero-media img,
.hero-orbit,
.hero-veil,
.hero-overlay {
  position: absolute;
  inset: 0;
}

.hero-media {
  z-index: 0;
}

.hero-media img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: center center;
  transform: translate3d(
      var(--hero-move-x, 0px),
      calc(var(--hero-scroll-y, 0px) + var(--hero-move-y, 0px)),
      0
    )
    scale(var(--hero-scale, 1.04));
  filter: saturate(1.08) contrast(1.04) brightness(1.04);
  will-change: transform;
}

.hero-veil {
  z-index: 1;
  background:
    radial-gradient(circle at 72% 52%, rgba(244, 217, 141, 0.2), transparent 34%),
    linear-gradient(90deg, rgba(247, 234, 208, 0.06), transparent 48%);
  mix-blend-mode: screen;
  opacity: 0.52;
  transform: translate3d(var(--hero-veil-x, 0px), var(--hero-veil-y, 0px), 0);
  pointer-events: none;
}

.hero-orbit {
  z-index: 1;
  overflow: hidden;
  pointer-events: none;
}

.hero-orbit span {
  position: absolute;
  right: -12vw;
  top: 6vh;
  width: 56vw;
  height: 56vw;
  border: 1px solid rgba(244, 217, 141, 0.16);
  border-radius: 50%;
  transform: rotate(22deg);
  animation: orbitDrift 18s linear infinite;
}

.hero-orbit span:nth-child(2) {
  right: 6vw;
  top: -18vh;
  width: 42vw;
  height: 42vw;
  animation-duration: 24s;
  animation-direction: reverse;
}

.hero-orbit span:nth-child(3) {
  right: 28vw;
  top: 16vh;
  width: 22vw;
  height: 22vw;
  border-color: rgba(77, 165, 141, 0.14);
  animation-duration: 30s;
}

.hero-overlay {
  z-index: 2;
  background: none;
  pointer-events: none;
}

.hero-content {
  position: relative;
  z-index: 4;
  width: min(620px, 100%);
  padding-bottom: 34px;
  transform: translate3d(0, var(--hero-content-y, 0px), 0);
  will-change: transform;
  text-shadow: 0 2px 18px rgba(0, 0, 0, 0.72);
}

.eyebrow {
  margin: 0 0 13px;
  color: var(--gold-bright);
  font-family: var(--font-ui);
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

.hero h1 {
  margin: 0;
  max-width: 820px;
  color: var(--paper);
  font-family: var(--font-display);
  font-size: clamp(36px, 5.5vw, 68px);
  font-weight: 800;
  line-height: 1.02;
  text-wrap: balance;
}

.hero-lede {
  max-width: 620px;
  margin: 22px 0 0;
  color: rgba(247, 234, 208, 0.82);
  font-size: clamp(15px, 1.55vw, 18px);
  line-height: 1.75;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 28px;
}

.hero-panel {
  position: absolute;
  z-index: 4;
  right: clamp(20px, 5vw, 72px);
  bottom: 52px;
  display: grid;
  grid-template-columns: repeat(2, minmax(130px, 1fr));
  gap: 1px;
  width: min(420px, calc(100% - 40px));
  overflow: hidden;
  border: 1px solid rgba(244, 217, 141, 0.24);
  border-radius: 8px;
  background: rgba(44, 30, 16, 0.42);
  backdrop-filter: blur(18px);
}

.hero-panel div {
  min-height: 96px;
  padding: 18px;
  background: rgba(247, 234, 208, 0.045);
}

.hero-panel strong {
  display: block;
  color: var(--gold-bright);
  font-family: var(--font-ui);
  font-size: 29px;
  line-height: 1;
}

.hero-panel span {
  display: block;
  margin-top: 8px;
  color: rgba(247, 234, 208, 0.72);
  font-size: 13px;
  line-height: 1.5;
}

.hero-next {
  position: absolute;
  z-index: 4;
  left: clamp(20px, 5vw, 72px);
  bottom: 22px;
  display: flex;
  gap: 10px;
  align-items: center;
  color: rgba(247, 234, 208, 0.55);
  font-family: var(--font-ui);
  font-size: 12px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

.hero-next i {
  width: 82px;
  height: 1px;
  background: linear-gradient(90deg, var(--gold), transparent);
}

.section {
  position: relative;
  min-height: 100svh;
  padding: clamp(66px, 8vw, 104px) clamp(20px, 5vw, 72px);
}

.section-heading {
  max-width: 760px;
  margin: 0 auto 36px;
  text-align: center;
}

.section-heading.wide {
  max-width: 960px;
}

.section-heading h2,
.sticky-copy h2,
.city-copy h2,
.operation-copy h2,
.closing-section h2 {
  margin: 0;
  color: var(--paper);
  font-family: var(--font-display);
  font-size: clamp(28px, 4.2vw, 50px);
  line-height: 1.12;
  text-wrap: balance;
}

.section-heading p:not(.eyebrow),
.sticky-copy p:not(.eyebrow),
.city-copy p,
.operation-copy p,
.closing-section p {
  margin: 20px 0 0;
  color: rgba(247, 234, 208, 0.72);
  font-size: 15px;
  line-height: 1.75;
}

.strategy-section {
  padding-top: calc(var(--header) + 28px);
  padding-bottom: 38px;
  background:
    linear-gradient(180deg, rgba(15, 12, 9, 0.92), rgba(24, 20, 14, 0.98)),
    var(--lacquer);
}

.fullscreen-section {
  display: grid;
  align-items: center;
}

.section-heading.left {
  margin: 0;
  text-align: left;
}

.strategy-layout {
  display: grid;
  grid-template-columns: minmax(280px, 0.78fr) minmax(240px, 0.58fr) minmax(360px, 1.05fr);
  gap: clamp(18px, 3vw, 42px);
  align-items: center;
  width: min(1280px, 100%);
  margin: 0 auto;
}

.strategy-grid,
.value-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 14px;
  max-width: var(--max);
  margin: 0 auto;
}

.strategy-layout .strategy-grid {
  grid-template-columns: 1fr;
  margin: 0;
}

.strategy-art {
  position: relative;
  display: grid;
  grid-template-columns: minmax(0, 1fr) 128px;
  gap: 14px;
  min-height: 510px;
}

.strategy-art-main {
  position: relative;
  min-height: 510px;
  margin: 0;
  overflow: hidden;
  border: 1px solid rgba(244, 217, 141, 0.26);
  border-radius: 8px;
  background: rgba(247, 234, 208, 0.04);
  box-shadow: 0 32px 90px rgba(0, 0, 0, 0.32);
}

.strategy-art-main img,
.strategy-art-stack img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.strategy-art-main figcaption {
  position: absolute;
  left: 18px;
  bottom: 18px;
  padding: 8px 11px;
  border: 1px solid rgba(244, 217, 141, 0.25);
  border-radius: 6px;
  color: var(--paper);
  background: rgba(58, 35, 14, 0.5);
  backdrop-filter: blur(10px);
  font-family: var(--font-ui);
  font-size: 12px;
}

.strategy-art-stack {
  display: grid;
  grid-template-rows: 1fr 1fr;
  gap: 14px;
}

.strategy-art-stack img {
  min-height: 0;
  border: 1px solid rgba(244, 217, 141, 0.24);
  border-radius: 8px;
  filter: saturate(1.06) contrast(1.02);
}

.visual-story-section {
  display: grid;
  grid-template-columns: minmax(360px, 520px) minmax(620px, 1fr);
  gap: clamp(34px, 4vw, 58px);
  align-items: center;
  min-height: 100svh;
  overflow: hidden;
  padding-top: calc(var(--header) + 28px);
  padding-bottom: 46px;
  padding-left: clamp(64px, 7vw, 132px);
  padding-right: clamp(64px, 7vw, 132px);
  background:
    linear-gradient(90deg, rgba(16, 12, 8, 0.92) 0%, rgba(15, 12, 8, 0.72) 40%, rgba(9, 11, 10, 0.94) 100%),
    radial-gradient(circle at 72% 34%, rgba(214, 168, 79, 0.16), transparent 34%),
    var(--ink);
}

.visual-copy {
  position: relative;
  top: -28px;
  z-index: 2;
  width: 100%;
  max-width: 520px;
  justify-self: end;
}

.visual-copy h2 {
  margin: 0;
  font-family: var(--font-display);
  font-size: clamp(32px, 4.2vw, 56px);
  line-height: 1.08;
}

.visual-copy p:not(.eyebrow) {
  color: rgba(247, 234, 208, 0.74);
  line-height: 1.8;
}

.visual-steps {
  display: grid;
  gap: 8px;
  margin-top: 24px;
}

.visual-steps button {
  display: grid;
  grid-template-columns: 42px 1fr;
  gap: 12px;
  align-items: center;
  min-height: 52px;
  padding: 0 16px;
  border: 1px solid rgba(244, 217, 141, 0.18);
  border-radius: 6px;
  color: rgba(247, 234, 208, 0.72);
  background: rgba(247, 234, 208, 0.045);
  cursor: pointer;
  text-align: left;
  transition:
    color 180ms ease,
    background 180ms ease,
    border-color 180ms ease,
    transform 180ms ease;
}

.visual-steps button span {
  color: var(--jade);
  font-family: var(--font-ui);
  font-size: 12px;
  font-weight: 700;
}

.visual-steps button:hover,
.visual-steps button.active {
  transform: translateX(5px);
  border-color: rgba(244, 217, 141, 0.58);
  color: var(--gold-bright);
  background: rgba(214, 168, 79, 0.13);
}

.visual-stage {
  position: relative;
  top: -28px;
  z-index: 1;
  aspect-ratio: 16 / 9;
  min-height: 0;
  margin: 0;
  overflow: hidden;
  border: 1px solid rgba(244, 217, 141, 0.22);
  border-radius: 8px;
  background: rgba(247, 234, 208, 0.04);
  box-shadow: 0 38px 110px rgba(0, 0, 0, 0.34);
  justify-self: stretch;
}

.visual-stage img {
  width: 100%;
  height: 100%;
  min-height: 0;
  object-fit: contain;
  background: rgba(11, 9, 7, 0.72);
  transform: scale(1.01);
  transition:
    opacity 260ms ease,
    transform 720ms cubic-bezier(0.18, 0.84, 0.2, 1),
    filter 260ms ease;
}

.visual-stage.is-changing img {
  opacity: 0.32;
  transform: scale(1.06);
  filter: saturate(0.82);
}

.visual-stage figcaption {
  position: absolute;
  left: 22px;
  right: 22px;
  bottom: 22px;
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 6px 14px;
  align-items: end;
  padding: 16px;
  border: 1px solid rgba(244, 217, 141, 0.22);
  border-radius: 8px;
  background: rgba(35, 22, 12, 0.54);
  backdrop-filter: blur(12px);
}

.visual-stage figcaption span {
  grid-row: span 2;
  color: var(--gold-bright);
  font-family: var(--font-ui);
  font-size: 13px;
  font-weight: 700;
}

.visual-stage figcaption strong {
  font-family: var(--font-display);
  font-size: 26px;
  line-height: 1;
}

.visual-stage figcaption small {
  color: rgba(247, 234, 208, 0.74);
  font-size: 13px;
  line-height: 1.5;
}

.feature-card,
.value-grid article {
  min-height: 174px;
  padding: 18px;
  border: 1px solid rgba(244, 217, 141, 0.18);
  border-radius: 8px;
  background:
    linear-gradient(180deg, rgba(247, 234, 208, 0.08), rgba(247, 234, 208, 0.02)),
    rgba(10, 10, 8, 0.5);
}

.feature-card .card-index {
  color: var(--jade);
  font-family: var(--font-ui);
  font-size: 13px;
  font-weight: 700;
}

.feature-card h3,
.value-grid h3,
.line-card h3,
.hall-copy h3,
.route-panel h3,
.guide-card h3,
.game-card h3,
.tech-panel h3 {
  margin: 18px 0 0;
  color: var(--gold-bright);
  font-family: var(--font-display);
  font-size: 20px;
  line-height: 1.25;
}

.feature-card p,
.value-grid p,
.line-card p,
.hall-copy p,
.route-panel p,
.guide-card p,
.game-card p,
.tech-panel p {
  margin: 12px 0 0;
  color: rgba(247, 234, 208, 0.7);
  font-size: 13px;
  line-height: 1.75;
}

.narrative-section {
  overflow: hidden;
  min-height: 100svh;
  padding-top: calc(var(--header) + 52px);
  padding-bottom: 52px;
  background: var(--ink);
}

.narrative-bg,
.narrative-bg img {
  position: absolute;
  inset: 0;
}

.narrative-bg {
  z-index: 0;
  opacity: 0.46;
}

.narrative-bg img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  filter: saturate(1.06) brightness(1.02);
}

.narrative-section::after {
  position: absolute;
  inset: 0;
  z-index: 1;
  content: "";
  background:
    linear-gradient(90deg, rgba(9, 11, 10, 0.84) 0%, rgba(9, 11, 10, 0.45) 48%, rgba(9, 11, 10, 0.72) 100%),
    linear-gradient(180deg, rgba(9, 11, 10, 0.24), rgba(9, 11, 10, 0.66));
  pointer-events: none;
}

.narrative-layout {
  position: relative;
  z-index: 2;
  display: grid;
  grid-template-columns: minmax(300px, 0.78fr) minmax(0, 1.22fr);
  gap: clamp(28px, 5vw, 72px);
  align-items: center;
  width: min(1320px, 100%);
  margin: 0 auto;
}

.sticky-copy {
  position: sticky;
  top: calc(var(--header) + 36px);
  align-self: start;
}

.narrative-rail {
  display: grid;
  gap: 14px;
}

.narrative-board {
  display: grid;
  grid-template-columns: minmax(280px, 0.84fr) minmax(240px, 0.62fr);
  gap: 16px;
  align-items: stretch;
}

.line-card {
  position: relative;
  min-height: 142px;
  padding: 22px;
  border: 1px solid rgba(244, 217, 141, 0.16);
  border-radius: 8px;
  background: rgba(247, 234, 208, 0.07);
  backdrop-filter: blur(10px);
  cursor: pointer;
  transition:
    border-color 180ms ease,
    background 180ms ease;
}

.line-card:hover,
.line-card.active {
  --card-shift-x: 6px;
  border-color: rgba(244, 217, 141, 0.52);
  background: rgba(214, 168, 79, 0.1);
}

.line-card h3 {
  margin-top: 0;
}

.thread-preview {
  display: flex;
  flex-direction: column;
  justify-content: flex-end;
  min-height: 100%;
  padding: clamp(26px, 3.5vw, 44px);
  border: 1px solid rgba(77, 165, 141, 0.42);
  border-radius: 8px;
  background:
    linear-gradient(135deg, rgba(38, 77, 76, 0.72), rgba(96, 55, 18, 0.42)),
    rgba(10, 10, 8, 0.74);
  backdrop-filter: blur(14px);
}

.thread-preview span {
  color: var(--jade);
  font-family: var(--font-ui);
  font-size: 13px;
}

.thread-preview strong {
  display: block;
  margin-top: 10px;
  color: var(--gold-bright);
  font-family: var(--font-display);
  font-size: clamp(30px, 4vw, 54px);
  line-height: 1.08;
}

.thread-preview p {
  margin: 14px 0 0;
  color: rgba(247, 234, 208, 0.75);
  line-height: 1.75;
}

.museum-section {
  background:
    linear-gradient(180deg, rgba(24, 20, 14, 0.96), rgba(8, 9, 8, 0.98)),
    var(--lacquer);
}

.museum-tabs {
  display: flex;
  gap: 8px;
  justify-content: center;
  max-width: var(--max);
  margin: 0 auto 24px;
  overflow-x: auto;
  padding-bottom: 8px;
}

.museum-tabs button,
.route-switcher button,
.costume-row button,
.quiz-options button,
.tech-stack button {
  min-height: 42px;
  padding: 0 14px;
  border: 1px solid rgba(244, 217, 141, 0.18);
  border-radius: 6px;
  color: rgba(247, 234, 208, 0.76);
  background: rgba(247, 234, 208, 0.045);
  cursor: pointer;
  white-space: nowrap;
  font-size: 14px;
  transition:
    color 180ms ease,
    background 180ms ease,
    border-color 180ms ease;
}

.museum-tabs button:hover,
.museum-tabs button.active,
.route-switcher button:hover,
.route-switcher button.active,
.costume-row button:hover,
.costume-row button.active,
.tech-stack button:hover,
.tech-stack button.active {
  border-color: rgba(244, 217, 141, 0.62);
  color: var(--gold-bright);
  background: rgba(214, 168, 79, 0.14);
}

.museum-stage {
  display: grid;
  grid-template-columns: minmax(0, 1.35fr) minmax(320px, 0.65fr);
  gap: 0;
  max-width: var(--max);
  margin: 0 auto;
  overflow: hidden;
  border: 1px solid rgba(244, 217, 141, 0.22);
  border-radius: 8px;
  background: rgba(9, 11, 10, 0.74);
}

.hall-visual {
  min-height: 486px;
  margin: 0;
  background: #111;
}

.hall-visual img {
  width: 100%;
  height: 100%;
  min-height: 486px;
  object-fit: cover;
}

.hall-copy {
  display: flex;
  flex-direction: column;
  justify-content: center;
  padding: clamp(24px, 3.4vw, 40px);
  border-left: 1px solid rgba(244, 217, 141, 0.14);
}

.hall-number {
  margin: 0;
  color: var(--jade);
  font-family: "PingFang SC", "Microsoft YaHei", sans-serif;
  font-size: 13px;
  font-weight: 700;
}

.hall-copy h3 {
  margin-top: 14px;
  font-size: clamp(24px, 3vw, 34px);
}

.hall-list {
  display: grid;
  gap: 10px;
  margin: 24px 0 0;
  padding: 0;
  list-style: none;
}

.hall-list li {
  position: relative;
  padding-left: 18px;
  color: rgba(247, 234, 208, 0.76);
  line-height: 1.65;
}

.hall-list li::before {
  position: absolute;
  left: 0;
  top: 0.7em;
  width: 6px;
  height: 6px;
  border-radius: 999px;
  content: "";
  background: var(--gold);
}

.hall-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 28px;
}

.hall-tags span {
  padding: 7px 10px;
  border: 1px solid rgba(77, 165, 141, 0.34);
  border-radius: 999px;
  color: rgba(247, 234, 208, 0.78);
  background: rgba(77, 165, 141, 0.1);
  font-family: var(--font-ui);
  font-size: 12px;
}

.city-section,
.operation-section {
  display: grid;
  grid-template-columns: minmax(0, 1.1fr) minmax(320px, 0.9fr);
  gap: clamp(28px, 5vw, 64px);
  align-items: center;
  max-width: calc(var(--max) + 144px);
  margin: 0 auto;
}

.city-visual,
.operation-media {
  overflow: hidden;
  border: 1px solid rgba(244, 217, 141, 0.2);
  border-radius: 8px;
}

.city-visual img,
.operation-media img {
  width: 100%;
  aspect-ratio: 16 / 10;
  object-fit: cover;
}

.route-switcher,
.costume-row {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 28px;
}

.route-panel {
  margin-top: 16px;
  padding: 22px;
  border: 1px solid rgba(244, 217, 141, 0.18);
  border-radius: 8px;
  background: rgba(247, 234, 208, 0.045);
}

.route-panel h3 {
  margin-top: 0;
}

.route-panel ul {
  margin: 18px 0 0;
  padding-left: 20px;
  color: rgba(247, 234, 208, 0.72);
  line-height: 1.8;
}

.interaction-section {
  background:
    linear-gradient(180deg, rgba(9, 11, 10, 0.98), rgba(18, 14, 10, 0.96)),
    var(--ink);
}

.interaction-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.25fr) minmax(300px, 0.75fr);
  gap: 16px;
  max-width: var(--max);
  margin: 0 auto;
}

.guide-card,
.game-card {
  border: 1px solid rgba(244, 217, 141, 0.18);
  border-radius: 8px;
  background: rgba(247, 234, 208, 0.045);
}

.guide-card {
  display: grid;
  grid-template-columns: minmax(190px, 0.42fr) minmax(0, 0.58fr);
  gap: 24px;
  align-items: center;
  padding: 24px;
}

.guide-card img {
  width: min(260px, 100%);
  max-height: 420px;
  object-fit: contain;
  justify-self: center;
  filter: drop-shadow(0 24px 42px rgba(0, 0, 0, 0.38));
}

.game-card {
  padding: 26px;
}

.quiz-options {
  display: grid;
  gap: 10px;
  margin-top: 24px;
}

.quiz-options button {
  justify-content: flex-start;
  white-space: normal;
}

.quiz-options button.correct {
  border-color: rgba(77, 165, 141, 0.78);
  color: #dff8ed;
  background: rgba(77, 165, 141, 0.18);
}

.quiz-options button.wrong {
  border-color: rgba(185, 71, 47, 0.78);
  color: #ffd3c9;
  background: rgba(185, 71, 47, 0.18);
}

.quiz-result,
.costume-note {
  min-height: 28px;
}

.image-belt-section {
  min-height: 100svh;
  display: grid;
  align-content: center;
  overflow: hidden;
  padding: clamp(66px, 8vw, 104px) 0;
  background:
    linear-gradient(180deg, rgba(9, 11, 10, 0.95), rgba(23, 19, 13, 0.98)),
    var(--ink);
}

.section-heading.compact {
  max-width: 780px;
  margin-bottom: 30px;
  padding: 0 20px;
}

.image-belt {
  width: 100%;
  overflow: hidden;
  border-block: 1px solid rgba(244, 217, 141, 0.14);
  mask-image: linear-gradient(90deg, transparent, black 8%, black 92%, transparent);
}

.image-belt-track {
  display: flex;
  gap: 16px;
  width: max-content;
  padding: 18px 0;
  animation: imageBelt 42s linear infinite;
}

.image-belt-track img {
  width: min(42vw, 520px);
  height: 54svh;
  min-height: 360px;
  max-height: 520px;
  object-fit: cover;
  border: 1px solid rgba(244, 217, 141, 0.18);
  border-radius: 8px;
  filter: saturate(1.08) contrast(1.04);
}

.tech-section {
  background:
    linear-gradient(90deg, rgba(38, 77, 76, 0.18), transparent 44%),
    var(--charcoal);
}

.tech-layout {
  display: grid;
  grid-template-columns: minmax(240px, 0.36fr) minmax(0, 0.64fr);
  gap: 16px;
  max-width: var(--max);
  margin: 0 auto;
}

.tech-stack {
  display: grid;
  gap: 10px;
  align-self: stretch;
}

.tech-stack button {
  justify-content: flex-start;
  min-height: 62px;
  padding: 0 22px;
  font-size: 16px;
}

.tech-panel {
  min-height: 276px;
  padding: clamp(28px, 4vw, 46px);
  border: 1px solid rgba(244, 217, 141, 0.22);
  border-radius: 8px;
  background:
    linear-gradient(135deg, rgba(214, 168, 79, 0.14), rgba(77, 165, 141, 0.08)),
    rgba(9, 11, 10, 0.64);
}

.tech-panel span {
  color: var(--jade);
  font-family: var(--font-ui);
  font-weight: 700;
}

.value-section {
  overflow: hidden;
  min-height: 100svh;
  padding-top: calc(var(--header) + 50px);
  padding-bottom: 58px;
  background: var(--ink);
}

.value-bg,
.value-bg img {
  position: absolute;
  inset: 0;
}

.value-bg {
  z-index: 0;
  opacity: 0.46;
}

.value-bg img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  filter: saturate(1.08) brightness(0.9);
}

.value-section::after {
  position: absolute;
  inset: 0;
  z-index: 1;
  content: "";
  background:
    linear-gradient(90deg, rgba(9, 11, 10, 0.9) 0%, rgba(9, 11, 10, 0.54) 48%, rgba(9, 11, 10, 0.82) 100%),
    linear-gradient(180deg, rgba(9, 11, 10, 0.32), rgba(9, 11, 10, 0.76));
  pointer-events: none;
}

.value-layout {
  position: relative;
  z-index: 2;
  display: grid;
  grid-template-columns: minmax(320px, 0.42fr) minmax(0, 0.58fr);
  gap: clamp(28px, 5vw, 72px);
  align-items: center;
  width: min(1320px, 100%);
  margin: 0 auto;
}

.value-copy {
  max-width: 520px;
}

.value-metrics {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 10px;
  margin-top: 32px;
}

.value-metrics span {
  min-height: 86px;
  padding: 14px;
  border: 1px solid rgba(244, 217, 141, 0.2);
  border-radius: 8px;
  color: rgba(247, 234, 208, 0.72);
  background: rgba(9, 11, 10, 0.42);
  backdrop-filter: blur(12px);
  font-size: 13px;
  line-height: 1.45;
}

.value-metrics strong {
  display: block;
  margin-bottom: 7px;
  color: var(--gold-bright);
  font-family: var(--font-ui);
  font-size: 30px;
  line-height: 1;
}

.value-grid {
  grid-template-columns: repeat(2, minmax(0, 1fr));
  max-width: none;
  margin: 0;
  gap: 14px;
}

.value-grid article {
  min-height: 230px;
  padding: clamp(22px, 3vw, 32px);
  background:
    linear-gradient(145deg, rgba(247, 234, 208, 0.11), rgba(247, 234, 208, 0.035)),
    rgba(9, 11, 10, 0.56);
  backdrop-filter: blur(14px);
}

.value-index {
  color: var(--jade);
  font-family: var(--font-ui);
  font-size: 13px;
  font-weight: 700;
}

.value-grid h3 {
  margin-top: 22px;
  font-size: clamp(22px, 2.2vw, 30px);
}

.value-grid p {
  max-width: 32em;
  font-size: 14px;
}

.private-section {
  overflow: hidden;
  min-height: 92svh;
  padding-top: calc(var(--header) + 58px);
  padding-bottom: 58px;
  background: var(--lacquer);
}

.private-bg,
.private-bg img {
  position: absolute;
  inset: 0;
}

.private-bg {
  z-index: 0;
  opacity: 0.66;
}

.private-bg img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  filter: saturate(1.12) brightness(1.12);
}

.private-section::after {
  position: absolute;
  inset: 0;
  z-index: 1;
  content: "";
  background:
    linear-gradient(90deg, rgba(9, 11, 10, 0.72), rgba(9, 11, 10, 0.24) 52%, rgba(9, 11, 10, 0.66)),
    linear-gradient(180deg, rgba(9, 11, 10, 0.14), rgba(9, 11, 10, 0.5));
  pointer-events: none;
}

.private-layout {
  position: relative;
  z-index: 2;
  display: grid;
  grid-template-columns: minmax(300px, 0.42fr) minmax(0, 0.58fr);
  gap: clamp(24px, 5vw, 68px);
  align-items: center;
  width: min(1320px, 100%);
  margin: 0 auto;
}

.advantage-strip {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
}

.advantage-strip article {
  min-height: 132px;
  padding: 18px;
  border: 1px solid rgba(247, 234, 208, 0.2);
  border-radius: 8px;
  background: rgba(9, 11, 10, 0.42);
  backdrop-filter: blur(14px);
}

.advantage-strip span {
  display: block;
  color: var(--jade);
  font-family: var(--font-ui);
  font-size: 12px;
  font-weight: 700;
}

.advantage-strip strong {
  display: block;
  margin-top: 12px;
  color: var(--gold-bright);
  font-family: var(--font-display);
  font-size: 20px;
  line-height: 1.2;
}

.advantage-strip small {
  display: block;
  margin-top: 9px;
  color: rgba(247, 234, 208, 0.68);
  font-size: 13px;
  line-height: 1.55;
}

.operation-section {
  grid-template-columns: minmax(320px, 0.9fr) minmax(0, 1.1fr);
}

.timeline {
  display: grid;
  gap: 12px;
  margin-top: 30px;
}

.timeline div {
  display: grid;
  grid-template-columns: 110px 1fr;
  gap: 16px;
  align-items: center;
  padding: 18px;
  border: 1px solid rgba(244, 217, 141, 0.16);
  border-radius: 8px;
  background: rgba(247, 234, 208, 0.045);
}

.timeline strong {
  color: var(--gold-bright);
  font-size: 18px;
}

.timeline span {
  color: rgba(247, 234, 208, 0.72);
  line-height: 1.6;
}

.closing-section {
  position: relative;
  isolation: isolate;
  overflow: hidden;
  display: flex;
  align-items: flex-end;
  min-height: 100svh;
  padding: calc(var(--header) + 28px) clamp(20px, 5vw, 72px) clamp(96px, 8vw, 132px);
  text-align: left;
  background: var(--ink);
}

.closing-bg {
  position: absolute;
  top: var(--header);
  right: 0;
  bottom: 0;
  left: 0;
  z-index: 0;
  display: flex;
  justify-content: center;
  background:
    radial-gradient(circle at 50% 46%, rgba(214, 168, 79, 0.11), transparent 58%),
    var(--ink);
}

.closing-bg img {
  width: 100%;
  height: 100%;
  object-fit: contain;
  object-position: center center;
  filter: saturate(1.08) brightness(1.04);
}

.closing-section::before {
  position: absolute;
  inset: 0;
  z-index: 1;
  content: "";
  background:
    linear-gradient(180deg, rgba(9, 11, 10, 0) 0%, rgba(9, 11, 10, 0.06) 48%, rgba(9, 11, 10, 0.82) 100%),
    linear-gradient(90deg, rgba(9, 11, 10, 0.18), rgba(9, 11, 10, 0) 24%, rgba(9, 11, 10, 0) 76%, rgba(9, 11, 10, 0.18));
  pointer-events: none;
}

.closing-copy {
  position: relative;
  z-index: 2;
  display: grid;
  grid-template-columns: minmax(520px, 0.92fr) minmax(360px, 0.56fr) auto;
  column-gap: clamp(26px, 4vw, 64px);
  row-gap: 8px;
  align-items: center;
  width: min(1240px, 100%);
  margin: 0 auto;
  padding-top: 22px;
  border-top: 1px solid rgba(244, 217, 141, 0.38);
  background: none;
  box-shadow: none;
  backdrop-filter: none;
}

.closing-copy .eyebrow {
  grid-column: 1 / -1;
  margin: 0;
  color: var(--gold-bright);
  font-size: 12px;
  letter-spacing: 0.14em;
}

.closing-copy h2 {
  max-width: 860px;
  font-size: clamp(28px, 2.85vw, 40px);
  line-height: 1.14;
  text-wrap: auto;
  text-shadow: 0 6px 28px rgba(0, 0, 0, 0.82);
}

.closing-title-line {
  display: block;
}

.closing-title-mobile {
  display: inline;
}

.closing-copy p:not(.eyebrow) {
  max-width: 500px;
  margin: 0;
  text-shadow: 0 4px 18px rgba(0, 0, 0, 0.72);
}

.closing-section .button {
  margin: 0;
  align-self: center;
  white-space: nowrap;
}

.guide-bubble {
  position: fixed;
  right: 22px;
  bottom: 22px;
  z-index: 65;
  display: grid;
  grid-template-columns: 42px auto;
  gap: 10px;
  align-items: center;
  min-height: 58px;
  padding: 8px 14px 8px 8px;
  border: 1px solid rgba(244, 217, 141, 0.5);
  border-radius: 999px;
  color: var(--paper);
  background: rgba(9, 11, 10, 0.76);
  box-shadow: 0 18px 45px rgba(0, 0, 0, 0.38);
  cursor: pointer;
  backdrop-filter: blur(16px);
}

.guide-bubble img {
  width: 42px;
  height: 42px;
  border-radius: 50%;
  object-fit: cover;
  object-position: top;
  background: var(--paper);
}

.guide-bubble span {
  font-size: 13px;
  font-weight: 700;
}

.floating-guide {
  position: fixed;
  right: 22px;
  bottom: 94px;
  z-index: 64;
  width: min(320px, calc(100vw - 44px));
  padding: 22px;
  border: 1px solid rgba(244, 217, 141, 0.28);
  border-radius: 8px;
  background: rgba(9, 11, 10, 0.86);
  box-shadow: 0 24px 64px rgba(0, 0, 0, 0.45);
  opacity: 0;
  transform: translateY(12px);
  pointer-events: none;
  backdrop-filter: blur(18px);
  transition:
    opacity 180ms ease,
    transform 180ms ease;
}

.floating-guide.is-open {
  opacity: 1;
  transform: translateY(0);
  pointer-events: auto;
}

.floating-guide strong {
  color: var(--gold-bright);
  font-size: 22px;
}

.floating-guide p {
  margin: 12px 0 18px;
  color: rgba(247, 234, 208, 0.74);
  line-height: 1.7;
}

.guide-close {
  position: absolute;
  top: 8px;
  right: 10px;
  width: 30px;
  height: 30px;
  border: 0;
  color: rgba(247, 234, 208, 0.68);
  background: transparent;
  cursor: pointer;
  font-size: 22px;
}

[data-reveal] {
  --reveal-y: 24px;
  --parallax-y: 0px;
  --card-shift-x: 0px;
  opacity: 0;
  transform: translate3d(var(--card-shift-x), calc(var(--reveal-y) + var(--parallax-y)), 0);
  transition:
    opacity 700ms ease,
    transform 700ms cubic-bezier(0.18, 0.84, 0.2, 1),
    border-color 180ms ease,
    background 180ms ease;
}

[data-reveal].is-visible {
  --reveal-y: 0px;
  opacity: 1;
}

[data-parallax]:not([data-reveal]) {
  transform: translate3d(0, var(--parallax-y, 0px), 0);
  will-change: transform;
}

.motion-card {
  --tilt-x: 0deg;
  --tilt-y: 0deg;
  position: relative;
  overflow: hidden;
  transform-style: preserve-3d;
}

[data-reveal].motion-card {
  transform:
    perspective(900px)
    rotateX(var(--tilt-x))
    rotateY(var(--tilt-y))
    translate3d(var(--card-shift-x), calc(var(--reveal-y) + var(--parallax-y)), 0);
}

.motion-card:not([data-reveal]) {
  transform:
    perspective(900px)
    rotateX(var(--tilt-x))
    rotateY(var(--tilt-y));
  transition: transform 220ms ease;
}

.motion-card::after {
  position: absolute;
  inset: 0;
  content: "";
  background: radial-gradient(circle at var(--shine-x, 50%) var(--shine-y, 50%), rgba(244, 217, 141, 0.16), transparent 34%);
  opacity: 0;
  pointer-events: none;
  transition: opacity 220ms ease;
}

.motion-card:hover::after {
  opacity: 1;
}

.museum-stage.is-changing .hall-visual img {
  animation: hallImageIn 560ms cubic-bezier(0.18, 0.84, 0.2, 1);
}

.museum-stage.is-changing .hall-copy > * {
  animation: hallCopyIn 520ms cubic-bezier(0.18, 0.84, 0.2, 1);
}

@keyframes hallImageIn {
  from {
    opacity: 0.58;
    transform: scale(1.04) translateY(10px);
    filter: saturate(0.86) brightness(0.82);
  }
  to {
    opacity: 1;
    transform: scale(1) translateY(0);
    filter: saturate(1) brightness(1);
  }
}

@keyframes hallCopyIn {
  from {
    opacity: 0;
    transform: translateY(12px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes orbitDrift {
  from {
    transform: rotate(22deg);
  }
  to {
    transform: rotate(382deg);
  }
}

@keyframes imageBelt {
  from {
    transform: translateX(0);
  }
  to {
    transform: translateX(-50%);
  }
}

@media (max-width: 1080px) {
  .main-nav {
    display: none;
  }

  .chapter-rail {
    display: none;
  }

  .site-header {
    grid-template-columns: auto auto;
    justify-content: space-between;
  }

  .hero {
    min-height: auto;
    padding-bottom: 320px;
  }

  .hero-panel {
    left: clamp(20px, 5vw, 72px);
    right: auto;
  }

  .strategy-grid,
  .value-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .strategy-layout {
    grid-template-columns: 1fr;
  }

  .strategy-layout .strategy-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .strategy-art {
    min-height: 460px;
  }

  .visual-story-section {
    grid-template-columns: 1fr;
    align-content: center;
    gap: 28px;
    padding: calc(var(--header) + 38px) clamp(24px, 5vw, 56px) 58px;
  }

  .visual-copy {
    width: min(760px, 100%);
    margin: 0;
    max-width: 760px;
    justify-self: start;
    top: 0;
  }

  .visual-stage,
  .visual-stage img {
    min-height: 46svh;
  }

  .visual-stage {
    top: 0;
  }

  .narrative-section,
  .museum-stage,
  .city-section,
  .operation-section,
  .interaction-grid,
  .tech-layout,
  .value-layout,
  .narrative-layout,
  .narrative-board,
  .private-layout {
    grid-template-columns: 1fr;
  }

  .value-copy {
    max-width: 760px;
  }

  .closing-copy {
    grid-template-columns: 1fr;
    gap: 16px;
    align-items: start;
  }

  .closing-copy p:not(.eyebrow) {
    max-width: 680px;
  }

  .closing-section .button {
    width: max-content;
  }

  .sticky-copy {
    position: relative;
    top: auto;
  }

  .thread-preview {
    min-height: 320px;
  }

  .hall-copy {
    border-left: 0;
    border-top: 1px solid rgba(244, 217, 141, 0.14);
  }
}

@media (max-width: 1180px) {
  .main-nav {
    display: none;
  }

  .site-header {
    grid-template-columns: auto auto;
    justify-content: space-between;
  }
}

@media (max-width: 720px) {
  :root {
    --header: 66px;
  }

  .site-header {
    padding: 0 16px;
  }

  .brand-mark span {
    font-size: 17px;
  }

  .nav-cta {
    min-height: 38px;
    padding: 0 12px;
    font-size: 13px;
  }

  .hero {
    padding: calc(var(--header) + 40px) 18px 238px;
  }

  .hero h1 {
    font-size: clamp(34px, 12vw, 52px);
  }

  .hero-panel {
    grid-template-columns: 1fr 1fr;
    bottom: 24px;
    width: calc(100% - 36px);
  }

  .hero-panel div {
    min-height: 82px;
    padding: 14px;
  }

  .hero-panel strong {
    font-size: 25px;
  }

  .hero-panel span {
    margin-top: 7px;
    font-size: 12px;
  }

  .section {
    padding: 58px 18px;
  }

  .section-heading {
    text-align: left;
  }

  .strategy-grid,
  .value-grid {
    grid-template-columns: 1fr;
  }

  .section {
    min-height: auto;
  }

  .strategy-layout .strategy-grid {
    grid-template-columns: 1fr;
  }

  .strategy-art {
    grid-template-columns: 1fr;
    min-height: auto;
  }

  .strategy-art-main {
    min-height: 310px;
  }

  .strategy-art-stack {
    grid-template-columns: 1fr 1fr;
    grid-template-rows: auto;
    height: 150px;
  }

  .visual-steps {
    grid-template-columns: 1fr 1fr;
  }

  .visual-story-section {
    padding: calc(var(--header) + 34px) 18px 58px;
  }

  .value-section {
    padding: calc(var(--header) + 40px) 18px 58px;
  }

  .closing-section {
    min-height: 100svh;
    padding: calc(var(--header) + 34px) 18px 64px;
  }

  .closing-bg img {
    min-height: 100%;
    object-fit: cover;
    object-position: center center;
  }

  .closing-copy {
    width: calc(100% + 36px);
    margin: 0 -18px -64px;
    padding: 22px 18px 104px;
    border-top-color: rgba(244, 217, 141, 0.3);
    background: linear-gradient(180deg, rgba(9, 11, 10, 0), rgba(9, 11, 10, 0.86) 24%, rgba(9, 11, 10, 0.94));
  }

  .closing-copy h2 {
    font-size: 27px;
    line-height: 1.24;
  }

  .closing-title-mobile {
    display: block;
  }

  .value-layout {
    gap: 24px;
  }

  .value-metrics {
    grid-template-columns: 1fr;
    margin-top: 24px;
  }

  .value-metrics span {
    min-height: auto;
  }

  .visual-steps button {
    grid-template-columns: 1fr;
    gap: 4px;
    min-height: 68px;
    padding: 10px;
  }

  .visual-stage,
  .visual-stage img {
    min-height: 360px;
  }

  .visual-stage figcaption {
    left: 12px;
    right: 12px;
    bottom: 12px;
    grid-template-columns: 1fr;
  }

  .thread-preview {
    min-height: 280px;
  }

  .narrative-board {
    gap: 12px;
  }

  .private-layout {
    gap: 22px;
  }

  .advantage-strip {
    grid-template-columns: 1fr;
  }

  .advantage-strip article {
    min-height: auto;
  }

  .image-belt-track img {
    width: 76vw;
    height: 330px;
    min-height: 330px;
  }

  .feature-card,
  .value-grid article {
    min-height: auto;
  }

  .hall-visual,
  .hall-visual img {
    min-height: 320px;
  }

  .guide-card {
    grid-template-columns: 1fr;
  }

  .guide-card img {
    max-height: 300px;
  }

  .timeline div {
    grid-template-columns: 1fr;
  }

  .guide-bubble {
    right: 14px;
    bottom: 14px;
  }

  .floating-guide {
    right: 14px;
    bottom: 86px;
    width: calc(100vw - 28px);
  }
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    scroll-behavior: auto !important;
    transition-duration: 0.001ms !important;
    animation-duration: 0.001ms !important;
  }

  .hero-media img {
    transform: none;
  }
}