:root {
  --bg: #120d0b;
  --bg-soft: rgba(15, 10, 8, 0.72);
  --panel: rgba(31, 20, 16, 0.48);
  --panel-strong: rgba(22, 14, 11, 0.84);
  --line: rgba(255, 223, 173, 0.22);
  --gold: #f0c987;
  --gold-strong: #ffe2b7;
  --text: #fff8ef;
  --muted: rgba(255, 245, 228, 0.72);
  --shadow: 0 24px 80px rgba(0, 0, 0, 0.42);
  --radius: 28px;
  --hud-height: 54px;
}

* {
  box-sizing: border-box;
}

html {
  scroll-snap-type: y mandatory;
  background:
    radial-gradient(circle at top, rgba(183, 129, 72, 0.18), transparent 26%),
    linear-gradient(180deg, #1c120f 0%, #100b09 100%);
}

body {
  margin: 0;
  min-height: 100svh;
  color: var(--text);
  font-family: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  overflow-x: hidden;
}

body::before {
  content: "";
  position: fixed;
  inset: 0;
  pointer-events: none;
  background:
    radial-gradient(circle at 20% 20%, rgba(255, 206, 139, 0.16), transparent 20%),
    radial-gradient(circle at 80% 30%, rgba(255, 255, 255, 0.08), transparent 18%),
    radial-gradient(circle at 50% 80%, rgba(255, 206, 139, 0.12), transparent 22%);
  mix-blend-mode: screen;
  animation: ambientGlow 9s ease-in-out infinite alternate;
  z-index: 1;
}

.app-shell {
  position: relative;
}

.hud {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 30;
  padding:
    calc(env(safe-area-inset-top, 0px) + 14px)
    18px
    8px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  background:
    linear-gradient(180deg, rgba(9, 7, 6, 0.72) 0%, rgba(9, 7, 6, 0.16) 74%, transparent 100%);
}

.sound-toggle {
  display: grid;
  place-items: center;
  appearance: none;
  border: 1px solid rgba(255, 223, 173, 0.28);
  border-radius: 999px;
  width: 42px;
  height: 42px;
  padding: 0;
  background: rgba(16, 11, 9, 0.56);
  color: var(--gold-strong);
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.2);
}

.sound-toggle.is-on {
  background: linear-gradient(90deg, rgba(241, 201, 131, 0.22), rgba(255, 226, 183, 0.14));
  border-color: rgba(255, 223, 173, 0.4);
}

.sound-toggle__icon {
  position: relative;
  width: 18px;
  height: 18px;
  display: block;
}

.sound-toggle__disc {
  position: absolute;
  left: 0;
  top: 4px;
  width: 7px;
  height: 10px;
  border-radius: 3px 2px 2px 3px;
  background: linear-gradient(180deg, var(--gold-strong), #cda15e);
  box-shadow: 0 0 10px rgba(255, 226, 183, 0.22);
}

.sound-toggle__wave {
  position: absolute;
  right: 0;
  top: 50%;
  width: 8px;
  height: 8px;
  border: 1.5px solid rgba(255, 226, 183, 0.88);
  border-left: 0;
  border-radius: 0 10px 10px 0;
  transform: translateY(-50%);
  transform-origin: left center;
  opacity: 0;
}

.sound-toggle__wave--one {
  right: 4px;
}

.sound-toggle__wave--two {
  width: 11px;
  height: 12px;
}

.sound-toggle__mute {
  position: absolute;
  left: 7px;
  top: 8px;
  width: 12px;
  height: 1.5px;
  background: rgba(255, 226, 183, 0.9);
  transform: rotate(-38deg);
  border-radius: 999px;
  opacity: 1;
}

.sound-toggle.is-on .sound-toggle__wave {
  opacity: 1;
}

.sound-toggle.is-on .sound-toggle__mute {
  opacity: 0;
}

.hud__eyebrow {
  font-size: 11px;
  letter-spacing: 0.28em;
  color: rgba(255, 225, 176, 0.9);
}

.story {
  position: relative;
  z-index: 2;
}

.scene {
  position: relative;
  height: 100svh;
  min-height: 100svh;
  padding:
    calc(var(--hud-height) + env(safe-area-inset-top, 0px))
    20px
    calc(34px + env(safe-area-inset-bottom, 0px));
  scroll-snap-align: start;
  scroll-snap-stop: always;
  overflow: hidden;
  display: flex;
  align-items: end;
}

.scene__backdrop,
.scene__grain,
.scene__scanline,
.scene__flare {
  position: absolute;
  inset: 0;
}

.scene__backdrop {
  background:
    linear-gradient(180deg, rgba(11, 7, 6, 0.2) 0%, rgba(10, 7, 6, 0.6) 48%, rgba(10, 7, 6, 0.97) 100%),
    var(--bg) center / cover no-repeat;
  transform: scale(1.08);
  transition: transform 1.5s ease, filter 1.2s ease;
  filter: saturate(0.88) brightness(0.66);
}

.scene__grain {
  background-image:
    linear-gradient(125deg, rgba(255, 213, 145, 0.08), transparent 35%),
    radial-gradient(circle at center, transparent 0 58%, rgba(0, 0, 0, 0.48) 100%);
  mix-blend-mode: screen;
  opacity: 0.9;
}

.scene__scanline {
  opacity: 0.12;
  background:
    repeating-linear-gradient(
      180deg,
      rgba(255, 255, 255, 0.08) 0,
      rgba(255, 255, 255, 0.08) 1px,
      transparent 1px,
      transparent 4px
    );
}

.scene__flare {
  background: linear-gradient(110deg, transparent 36%, rgba(255, 224, 180, 0.2) 50%, transparent 64%);
  transform: translateX(-120%);
  opacity: 0;
}

.scene__content {
  position: relative;
  width: 100%;
  display: grid;
  gap: 18px;
  transform: translateY(38px);
  opacity: 0.12;
  transition:
    transform 0.78s cubic-bezier(0.2, 0.85, 0.2, 1),
    opacity 0.78s ease;
}

.scene__content--poster {
  align-content: end;
  min-height: 68svh;
}

.scene.is-active .scene__backdrop {
  transform: scale(1);
  filter: saturate(1.02) brightness(0.84);
}

.scene.is-active .scene__content {
  transform: translateY(0);
  opacity: 1;
}

.scene.is-active .scene__flare {
  opacity: 1;
  animation: sweep 1.8s ease;
}

.scene__chapter {
  display: inline-grid;
  gap: 4px;
  width: fit-content;
  padding: 10px 14px;
  border-radius: 18px;
  border: 1px solid rgba(255, 223, 173, 0.28);
  background: rgba(18, 12, 10, 0.46);
}

.scene__chapter span,
.scene__tag,
.card__label,
.glass-panel__title,
.timeline-card__item span {
  font-size: 11px;
  letter-spacing: 0.22em;
  color: var(--gold);
  text-transform: uppercase;
}

.scene__chapter strong {
  font-size: 15px;
  color: var(--gold-strong);
}

.scene__tag {
  margin: 0;
  letter-spacing: 0.34em;
}

.scene__headline {
  margin: 0;
  max-width: 10em;
  font-family: "Baskerville", "Times New Roman", serif;
  font-size: clamp(34px, 9vw, 52px);
  line-height: 0.96;
  letter-spacing: 0.01em;
  text-shadow: 0 10px 30px rgba(0, 0, 0, 0.36);
}

.key-facts {
  display: grid;
  gap: 10px;
}

.key-fact {
  display: grid;
  gap: 5px;
  padding: 16px 18px;
  border-radius: 22px;
  border: 1px solid rgba(255, 223, 173, 0.22);
  background: rgba(17, 12, 10, 0.48);
  box-shadow: var(--shadow);
}

.key-fact span {
  font-size: 11px;
  letter-spacing: 0.18em;
  color: var(--gold);
  text-transform: uppercase;
}

.key-fact strong {
  font-size: 22px;
  line-height: 1.2;
}

.key-fact--primary strong {
  font-size: 28px;
}

.scene__summary {
  margin: 0;
  max-width: 24em;
  font-size: 15px;
  line-height: 1.65;
  color: var(--muted);
}

.scene__hint {
  width: fit-content;
  padding: 10px 14px;
  border: 1px solid var(--line);
  border-radius: 999px;
  font-size: 12px;
  color: var(--gold-strong);
  background: rgba(19, 11, 8, 0.4);
  animation: floatHint 1.8s ease-in-out infinite;
}

.poster-kicker {
  margin: 0;
  font-size: 11px;
  letter-spacing: 0.42em;
  color: rgba(255, 228, 182, 0.86);
}

.poster-title {
  margin: 0;
  max-width: 7em;
  font-family: "Baskerville", "Times New Roman", serif;
  font-size: clamp(54px, 14vw, 90px);
  line-height: 0.9;
  letter-spacing: 0.02em;
  text-shadow: 0 18px 40px rgba(0, 0, 0, 0.45);
}

.poster-credits {
  display: grid;
  gap: 6px;
  width: fit-content;
  padding: 14px 0 0;
}

.poster-credits p {
  margin: 0;
  font-size: 12px;
  letter-spacing: 0.18em;
  color: rgba(255, 243, 223, 0.82);
  text-transform: uppercase;
}

.hero-poster,
.glass-card,
.glass-panel,
.timeline-card,
.route-card,
.schedule,
.mission-strip {
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
}

.hero-poster {
  display: grid;
  gap: 12px;
  padding: 18px;
  border-radius: var(--radius);
  border: 1px solid var(--line);
  background:
    linear-gradient(180deg, rgba(57, 34, 19, 0.46) 0%, rgba(15, 10, 8, 0.72) 100%);
  box-shadow: var(--shadow);
}

.hero-poster__meta {
  display: grid;
  gap: 4px;
}

.hero-poster__meta span {
  color: var(--gold);
  font-size: 11px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
}

.hero-poster__meta strong,
.glass-card strong,
.timeline-card__item strong,
.route-stop strong,
.glass-panel h3,
.schedule__item strong,
.closing-badge strong {
  font-size: 17px;
  font-weight: 600;
}

.mission-strip {
  display: grid;
  gap: 5px;
  padding: 14px 16px;
  border-radius: 22px;
  border: 1px solid rgba(255, 223, 173, 0.24);
  background: rgba(15, 10, 8, 0.5);
}

.mission-strip span {
  font-size: 11px;
  letter-spacing: 0.26em;
  color: var(--gold);
}

.mission-strip strong {
  font-size: 15px;
}

.info-grid {
  display: grid;
  gap: 12px;
}

.glass-card,
.glass-panel {
  padding: 18px;
  border-radius: 24px;
  border: 1px solid var(--line);
  background: linear-gradient(180deg, rgba(255, 255, 255, 0.08) 0%, rgba(19, 12, 10, 0.52) 100%);
  box-shadow: var(--shadow);
}

.glass-card p,
.glass-panel__body,
.route-stop p,
.route-note,
.schedule__item p {
  margin: 8px 0 0;
  color: var(--muted);
  line-height: 1.6;
  font-size: 14px;
}

.mini-strip {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 8px;
}

.mini-strip img {
  width: 100%;
  height: 118px;
  object-fit: cover;
  border-radius: 18px;
  border: 1px solid rgba(255, 255, 255, 0.16);
  box-shadow: var(--shadow);
}

.timeline-card {
  position: relative;
  display: grid;
  gap: 14px;
  padding: 20px 18px 20px 26px;
  border-radius: 26px;
  border: 1px solid var(--line);
  background: linear-gradient(180deg, rgba(17, 12, 10, 0.42) 0%, rgba(12, 8, 6, 0.78) 100%);
  box-shadow: var(--shadow);
}

.timeline-card__line {
  position: absolute;
  left: 16px;
  top: 22px;
  bottom: 22px;
  width: 2px;
  background: linear-gradient(180deg, rgba(255, 216, 156, 0.2), rgba(255, 216, 156, 0.85));
}

.timeline-card__item {
  position: relative;
  display: grid;
  gap: 4px;
}

.timeline-card__item::before {
  content: "";
  position: absolute;
  left: -15px;
  top: 8px;
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--gold-strong);
  box-shadow: 0 0 16px rgba(255, 216, 156, 0.45);
}

.route-card,
.schedule {
  display: grid;
  gap: 14px;
  padding: 18px;
  border-radius: 26px;
  border: 1px solid var(--line);
  background: linear-gradient(180deg, rgba(17, 12, 10, 0.42) 0%, rgba(12, 8, 6, 0.82) 100%);
  box-shadow: var(--shadow);
}

.route-stop,
.schedule__item {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 12px;
}

.route-stop__point,
.schedule__time {
  min-width: 68px;
  height: fit-content;
  padding: 10px 12px;
  border-radius: 999px;
  border: 1px solid rgba(255, 223, 173, 0.32);
  color: var(--gold-strong);
  text-align: center;
  font-family: "Baskerville", "Times New Roman", serif;
  background: rgba(255, 221, 170, 0.06);
  font-size: 20px;
}

.route-note {
  padding-top: 4px;
}

.closing-badge {
  display: grid;
  gap: 6px;
  width: fit-content;
  padding: 16px 18px;
  border-radius: 22px;
  border: 1px solid var(--line);
  background: rgba(17, 11, 9, 0.58);
  box-shadow: var(--shadow);
}

.closing-badge span {
  font-size: 11px;
  letter-spacing: 0.24em;
  color: var(--gold);
}

.closing-quote {
  font-family: "Baskerville", "Times New Roman", serif;
  font-size: 22px;
  line-height: 1.4;
  color: rgba(255, 244, 224, 0.92);
}

@keyframes ambientGlow {
  from {
    transform: scale(1) translateY(0);
    opacity: 0.72;
  }

  to {
    transform: scale(1.05) translateY(-8px);
    opacity: 1;
  }
}

@keyframes floatHint {
  0%,
  100% {
    transform: translateY(0);
  }

  50% {
    transform: translateY(-6px);
  }
}

@keyframes sweep {
  0% {
    transform: translateX(-120%);
  }

  100% {
    transform: translateX(120%);
  }
}