:root {
  color-scheme: dark;
  --bg: #000000;
  --ink: #f8e8bd;
  --muted: rgba(248, 232, 189, 0.7);
  --soft: rgba(233, 241, 250, 0.76);
  --gold: #e8b85b;
  --gold-2: #fff0b8;
  --realm-a: #6fc7ff;
  --realm-b: #f8c667;
  --panel: rgba(2, 13, 18, 0.66);
  --line: rgba(232, 184, 91, 0.42);
  --shadow: rgba(0, 0, 0, 0.4);
  --calligraphy: "KaiTi", "STKaiti", "FZKai-Z03", "HYKaiti", "Noto Serif SC", "Songti SC", serif;
  font-family: "Noto Serif SC", "Songti SC", "Microsoft YaHei UI", "PingFang SC", serif;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  overflow-x: hidden;
}

button,
input {
  font: inherit;
}

button {
  color: inherit;
}

.experience {
  position: relative;
  min-height: 100vh;
  overflow: hidden;
  background: #000;
}

#energy-canvas {
  position: fixed;
  inset: 0;
  width: 100%;
  height: 100%;
  z-index: 0;
  cursor: grab;
  touch-action: none;
}

#energy-canvas:active {
  cursor: grabbing;
}

.ambient-layer,
.site-header,
.hero,
.realms,
.path,
.scenes,
.about,
.player,
.immersive-hud,
.immersive-track-badge,
.guide-caption {
  position: relative;
  z-index: 1;
}

.ambient-layer {
  position: fixed;
  inset: 0;
  pointer-events: none;
  overflow: hidden;
  opacity: 0;
}

.ambient-layer::before {
  content: "";
  position: absolute;
  inset: 0;
  background:
    linear-gradient(90deg, rgba(1, 8, 12, 0.98), transparent 34%, transparent 68%, rgba(1, 8, 12, 0.92)),
    linear-gradient(180deg, rgba(1, 6, 10, 0.18), rgba(1, 6, 10, 0.34) 58%, rgba(1, 6, 10, 0.92));
}

.ambient-layer::after {
  content: "";
  position: absolute;
  inset: -12%;
  background:
    radial-gradient(circle at 46% 42%, rgba(248, 198, 103, 0.18), transparent 19rem),
    repeating-radial-gradient(circle at 48% 44%, rgba(248, 198, 103, 0.18) 0 1px, transparent 1px 18px);
  opacity: 0.34;
  animation: ambient-drift 18s linear infinite;
}

.moon {
  position: absolute;
  top: 15vh;
  right: 15vw;
  width: clamp(3.8rem, 6vw, 5.7rem);
  aspect-ratio: 1;
  border-radius: 50%;
  background:
    radial-gradient(circle at 42% 34%, rgba(255,255,255,0.96), rgba(240,232,198,0.86) 33%, rgba(93,126,146,0.52) 62%, rgba(255,255,255,0.1) 70%),
    radial-gradient(circle at 68% 68%, rgba(36, 57, 70, 0.55), transparent 34%),
    #d8e1e6;
  box-shadow: 0 0 3.2rem rgba(191, 224, 255, 0.34);
  opacity: 0.56;
  filter: saturate(0.72);
}

.mountains {
  position: absolute;
  right: -8vw;
  bottom: 20vh;
  width: 74vw;
  height: 34vh;
  clip-path: polygon(0 100%, 7% 72%, 13% 86%, 23% 42%, 31% 78%, 43% 34%, 52% 80%, 61% 50%, 70% 82%, 82% 25%, 91% 77%, 100% 45%, 100% 100%);
  background: linear-gradient(180deg, rgba(50, 97, 122, 0.6), rgba(3, 15, 23, 0.9));
  filter: blur(0.2px);
}

.mountains-front {
  right: -12vw;
  bottom: 10vh;
  height: 30vh;
  opacity: 0.88;
  background: linear-gradient(180deg, rgba(30, 65, 83, 0.76), rgba(3, 12, 18, 0.98));
}

.bamboo {
  position: absolute;
  left: -2vw;
  bottom: 0;
  width: 26vw;
  min-width: 14rem;
  height: 78vh;
  background:
    repeating-linear-gradient(84deg, transparent 0 1.1rem, rgba(64, 117, 88, 0.32) 1.1rem 1.28rem, transparent 1.28rem 2.5rem),
    linear-gradient(90deg, rgba(5, 34, 28, 0.85), rgba(5, 34, 28, 0));
  mask-image: linear-gradient(90deg, #000, transparent);
  opacity: 0.68;
}

.river {
  position: absolute;
  right: 5vw;
  bottom: 3vh;
  width: 45vw;
  height: 35vh;
  border-radius: 50%;
  transform: rotate(-16deg);
  background:
    radial-gradient(ellipse at 50% 50%, rgba(123, 211, 255, 0.2), transparent 48%),
    linear-gradient(90deg, transparent, rgba(141, 223, 255, 0.28), rgba(232, 184, 91, 0.2), transparent);
  filter: blur(18px);
}

.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1.2rem clamp(1.2rem, 4vw, 4.2rem);
  background: linear-gradient(180deg, rgba(1, 7, 11, 0.84), transparent);
  backdrop-filter: blur(12px);
  z-index: 5;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 0.8rem;
  color: var(--ink);
  text-decoration: none;
}

.brand-mark {
  display: grid;
  place-items: center;
  width: 2.55rem;
  height: 2.55rem;
  border: 1px solid var(--line);
  border-radius: 50%;
  color: var(--gold-2);
  font-family: "KaiTi", "STKaiti", "Noto Serif SC", serif;
  font-size: 1.25rem;
  background:
    radial-gradient(circle, rgba(255, 240, 184, 0.13), transparent 48%),
    conic-gradient(from 0deg, transparent, rgba(232, 184, 91, 0.24), transparent, rgba(232, 184, 91, 0.18), transparent);
  box-shadow: inset 0 0 1.4rem rgba(232, 184, 91, 0.22), 0 0 1.2rem rgba(232, 184, 91, 0.2);
}

.brand strong,
.brand em {
  display: block;
}

.brand strong {
  font-size: 1.05rem;
  letter-spacing: 0.08em;
  font-family: var(--calligraphy);
}

.brand em {
  margin-top: 0.12rem;
  font-size: 0.72rem;
  font-style: normal;
  color: var(--muted);
  font-family: Georgia, "Times New Roman", serif;
}

.desktop-nav {
  display: flex;
  gap: clamp(1.2rem, 3vw, 3rem);
}

.desktop-nav a {
  color: var(--ink);
  text-decoration: none;
  font-size: 0.95rem;
  letter-spacing: 0.16em;
  text-shadow: 0 0 1rem rgba(232, 184, 91, 0.4);
}

.menu-button {
  display: none;
  width: 2.8rem;
  height: 2.8rem;
  border: 0;
  background: transparent;
  padding: 0.4rem;
}

.menu-button span {
  display: block;
  height: 2px;
  margin: 0.42rem 0;
  background: var(--gold);
  box-shadow: 0 0 0.7rem rgba(232, 184, 91, 0.6);
}

.hero {
  min-height: 100vh;
  display: grid;
  place-items: center;
  padding: 8rem clamp(1.4rem, 6vw, 6rem) 8rem;
  text-align: center;
}

.hero-copy {
  width: min(68rem, 100%);
  transform: translateY(-1.8rem);
}

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

h1 {
  font-family: var(--calligraphy);
  font-size: clamp(3.5rem, 7.1vw, 7.4rem);
  line-height: 0.9;
  font-weight: 900;
  letter-spacing: 0.015em;
  color: var(--gold-2);
  white-space: nowrap;
  text-shadow:
    0 0 1rem rgba(232, 184, 91, 0.5),
    0 0 3rem rgba(232, 184, 91, 0.28),
    0 0 8rem rgba(111, 199, 255, 0.16);
}

@keyframes ambient-drift {
  from {
    transform: rotate(0deg) scale(1);
  }
  to {
    transform: rotate(360deg) scale(1.05);
  }
}

.english-title {
  margin-top: clamp(0.8rem, 1.5vw, 1.4rem);
  font-family: Georgia, "Times New Roman", serif;
  font-size: clamp(1.45rem, 2.8vw, 2.8rem);
  line-height: 1.05;
  color: #f7d38a;
}

.album-title {
  margin-top: 0.45rem;
  font-family: Georgia, "Times New Roman", serif;
  font-size: clamp(1rem, 1.9vw, 1.8rem);
  color: var(--muted);
  letter-spacing: 0.14em;
}

.slogan {
  margin-top: clamp(1.1rem, 2.2vw, 1.8rem);
  font-size: clamp(1.25rem, 2.3vw, 2.35rem);
  letter-spacing: 0.32em;
  color: var(--ink);
}

.hero-actions {
  margin-top: clamp(1.5rem, 3vw, 2.3rem);
  display: flex;
  justify-content: center;
  gap: 1rem;
  flex-wrap: wrap;
}

.primary-action,
.secondary-action {
  min-height: 3.25rem;
  padding: 0.85rem 2.1rem;
  border-radius: 8px;
  border: 1px solid var(--line);
  letter-spacing: 0.18em;
  cursor: pointer;
  transition: transform 180ms ease, box-shadow 180ms ease, background 180ms ease;
}

.primary-action {
  color: #1d1203;
  background: linear-gradient(135deg, #fff2bd, #d49a40);
  box-shadow: 0 1rem 3rem rgba(232, 184, 91, 0.25);
}

.secondary-action {
  background: rgba(2, 13, 18, 0.36);
  color: var(--ink);
  backdrop-filter: blur(12px);
}

.primary-action:hover,
.secondary-action:hover {
  transform: translateY(-2px);
  box-shadow: 0 1.2rem 3rem rgba(232, 184, 91, 0.28);
}

.energy-orbit {
  position: absolute;
  right: clamp(1.2rem, 4vw, 4rem);
  bottom: 10rem;
  width: min(18rem, calc(100% - 2rem));
  padding: 1rem 1.1rem;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: rgba(1, 9, 14, 0.5);
  backdrop-filter: blur(16px);
  text-align: left;
  box-shadow: 0 0 4rem color-mix(in srgb, var(--realm-b) 18%, transparent);
}

.energy-orbit p {
  color: var(--muted);
  font-size: 0.78rem;
  letter-spacing: 0.22em;
}

.energy-orbit strong {
  display: block;
  margin-top: 0.35rem;
  font-size: 1.8rem;
  font-family: var(--calligraphy);
}

.energy-orbit span {
  display: block;
  margin-top: 0.45rem;
  color: var(--soft);
  line-height: 1.7;
  font-size: 0.9rem;
}

.realms,
.path,
.scenes,
.about {
  padding: clamp(5rem, 10vw, 9rem) clamp(1.2rem, 5vw, 5rem);
}

.section-heading {
  width: min(62rem, 100%);
  margin: 0 auto clamp(2rem, 5vw, 4rem);
  text-align: center;
}

.section-heading h2 {
  font-family: var(--calligraphy);
  font-size: clamp(2rem, 4.4vw, 4.8rem);
  letter-spacing: 0.16em;
  color: var(--gold-2);
  text-shadow: 0 0 2rem rgba(232, 184, 91, 0.28);
}

.section-heading p {
  margin-top: 1rem;
  color: var(--soft);
  line-height: 1.9;
  font-size: clamp(1rem, 1.4vw, 1.25rem);
}

.realm-stage {
  width: min(96rem, 100%);
  margin: 0 auto;
  display: grid;
  grid-template-columns: minmax(18rem, 28rem) 1fr;
  gap: clamp(1.4rem, 3vw, 3rem);
  align-items: stretch;
}

.active-realm,
.path-line,
.player {
  border: 1px solid var(--line);
  background: var(--panel);
  backdrop-filter: blur(18px);
  box-shadow: 0 1.5rem 5rem var(--shadow), inset 0 0 4rem rgba(232, 184, 91, 0.05);
}

.active-realm {
  border-radius: 8px;
  padding: 1rem;
}

.active-realm img {
  width: 100%;
  aspect-ratio: 1;
  object-fit: cover;
  border-radius: 6px;
  box-shadow: 0 0 3rem color-mix(in srgb, var(--realm-b) 30%, transparent);
}

.realm-index {
  margin-top: 1.4rem;
  font-size: 1rem;
  color: var(--gold);
  letter-spacing: 0.24em;
}

.active-realm h3 {
  font-family: var(--calligraphy);
  margin-top: 0.35rem;
  font-size: clamp(2rem, 3vw, 3.2rem);
}

.track-english {
  margin-top: 0.35rem;
  font-family: Georgia, "Times New Roman", serif;
  color: var(--muted);
}

.track-desc {
  margin-top: 1rem;
  color: var(--soft);
  line-height: 1.9;
}

.visual-controls {
  display: grid;
  gap: 0.75rem;
  margin-top: 1.2rem;
  padding-top: 1rem;
  border-top: 1px solid rgba(232, 184, 91, 0.22);
}

.visual-controls label {
  display: grid;
  grid-template-columns: 5.4rem 1fr;
  align-items: center;
  gap: 0.75rem;
  color: var(--muted);
  font-size: 0.82rem;
  letter-spacing: 0.08em;
}

.visual-controls input[type="color"] {
  width: 100%;
  height: 2rem;
  border: 1px solid var(--line);
  border-radius: 6px;
  padding: 0.15rem;
  background: rgba(1, 9, 14, 0.55);
  cursor: pointer;
}

.visual-controls select {
  width: 100%;
  min-height: 2rem;
  border: 1px solid var(--line);
  border-radius: 6px;
  padding: 0.25rem 0.5rem;
  background: rgba(1, 9, 14, 0.72);
  color: var(--ink);
  outline: none;
}

.visual-controls input[type="checkbox"] {
  justify-self: start;
  width: 1.15rem;
  height: 1.15rem;
  accent-color: var(--realm-a);
}

.visual-controls input[type="range"] {
  width: 100%;
  accent-color: var(--realm-a);
}

.guide-status {
  margin: 0.1rem 0 0;
  color: color-mix(in srgb, var(--realm-a) 70%, #fff 20%);
  font-size: 0.78rem;
  line-height: 1.5;
}

.realm-list {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 1rem;
  align-content: stretch;
}

.realm-node {
  min-height: 8.6rem;
  padding: 1rem;
  border: 1px solid rgba(232, 184, 91, 0.24);
  border-radius: 8px;
  background: rgba(2, 13, 18, 0.42);
  color: var(--ink);
  text-align: left;
  cursor: pointer;
  transition: transform 180ms ease, border 180ms ease, box-shadow 180ms ease, background 180ms ease;
}

.realm-node span,
.realm-node strong,
.realm-node em {
  display: block;
}

.realm-node span {
  color: var(--gold);
  font-family: Georgia, "Times New Roman", serif;
  font-size: 1.5rem;
}

.realm-node strong {
  margin-top: 0.6rem;
  font-size: 1.14rem;
  letter-spacing: 0.1em;
  font-family: var(--calligraphy);
}

.realm-node em {
  margin-top: 0.45rem;
  color: var(--muted);
  font-style: normal;
}

.realm-node:hover,
.realm-node.active {
  transform: translateY(-3px);
  border-color: color-mix(in srgb, var(--realm-b) 74%, #fff 16%);
  background: color-mix(in srgb, var(--realm-a) 10%, rgba(2, 13, 18, 0.68));
  box-shadow: 0 0 2.5rem color-mix(in srgb, var(--realm-b) 22%, transparent);
}

.path-line {
  width: min(78rem, 100%);
  margin: 0 auto;
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  border-radius: 8px;
}

.path-line div {
  padding: clamp(1rem, 2vw, 1.8rem);
  border-right: 1px solid var(--line);
}

.path-line div:last-child {
  border-right: 0;
}

.path-line strong,
.path-line span {
  display: block;
}

.path-line strong {
  font-family: var(--calligraphy);
  font-size: 1.05rem;
  letter-spacing: 0.08em;
}

.path-line span {
  margin-top: 0.65rem;
  color: var(--soft);
  line-height: 1.7;
}

.about {
  padding-bottom: 12rem;
}

.author-info {
  display: grid;
  gap: 0.55rem;
  width: min(36rem, 100%);
  margin: 2rem auto 0;
  padding-top: 1.2rem;
  border-top: 1px solid rgba(232, 184, 91, 0.28);
  color: var(--muted);
  line-height: 1.7;
}

.author-info strong {
  color: var(--gold-2);
  font-size: 1rem;
  letter-spacing: 0.18em;
  font-family: var(--calligraphy);
}

.author-info span {
  font-size: 0.92rem;
}

.player {
  position: fixed;
  left: clamp(1rem, 3vw, 3rem);
  right: clamp(1rem, 3vw, 3rem);
  bottom: 1.2rem;
  display: grid;
  grid-template-columns: 4.8rem 1fr auto;
  align-items: center;
  gap: 1rem;
  min-height: 6.2rem;
  padding: 0.8rem 1rem;
  border-radius: 8px;
  z-index: 6;
}

.player img {
  width: 4.8rem;
  height: 4.8rem;
  object-fit: cover;
  border-radius: 6px;
}

.player-meta {
  min-width: 0;
}

.player-meta strong,
.player-meta span {
  display: block;
}

.player-meta strong {
  font-family: var(--calligraphy);
  font-size: 1.2rem;
  letter-spacing: 0.08em;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.player-meta span {
  margin-top: 0.25rem;
  color: var(--muted);
  font-size: 0.86rem;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.player-meta .player-status {
  color: color-mix(in srgb, var(--realm-a) 64%, #fff 20%);
  font-size: 0.78rem;
}

.progress-wrap {
  display: grid;
  grid-template-columns: 3.2rem 1fr 3.2rem;
  align-items: center;
  gap: 0.65rem;
  margin-top: 0.72rem;
  color: var(--muted);
  font-size: 0.78rem;
  font-family: Georgia, "Times New Roman", serif;
}

#seek {
  width: 100%;
  accent-color: var(--gold);
}

.player-controls {
  display: flex;
  align-items: center;
  gap: 0.62rem;
}

.player-controls button {
  display: grid;
  place-items: center;
  width: 2.7rem;
  height: 2.7rem;
  border: 1px solid var(--line);
  border-radius: 50%;
  background: rgba(1, 9, 14, 0.52);
  cursor: pointer;
}

#play-mode,
#sleep-timer {
  font-size: 0.82rem;
  letter-spacing: 0.04em;
}

.player-controls .play-button {
  width: 3.9rem;
  height: 3.9rem;
  color: #1d1203;
  background: linear-gradient(135deg, #fff1b7, #d2973f);
  font-size: 1.25rem;
  box-shadow: 0 0 2rem rgba(232, 184, 91, 0.34);
}

.immersive-track-badge {
  position: fixed;
  top: 1.25rem;
  left: 1.35rem;
  display: grid;
  gap: 0.25rem;
  max-width: min(24rem, calc(100vw - 2.7rem));
  color: color-mix(in srgb, var(--realm-a) 76%, #fff 24%);
  pointer-events: none;
  opacity: 0;
  transform: translateY(-0.25rem);
  text-shadow:
    0 0 0.8rem color-mix(in srgb, var(--realm-a) 60%, transparent),
    0 0 2.5rem color-mix(in srgb, var(--realm-a) 30%, transparent);
  transition: opacity 480ms ease, transform 480ms ease;
  z-index: 11;
}

.immersive-track-badge span {
  color: rgba(255, 240, 184, 0.54);
  font-size: 0.72rem;
  letter-spacing: 0.28em;
}

.immersive-track-badge strong {
  font-family: var(--calligraphy);
  font-size: clamp(1.45rem, 2.4vw, 2.7rem);
  font-weight: 700;
  letter-spacing: 0.14em;
}

.experience.is-immersive .immersive-track-badge {
  opacity: 1;
  transform: translateY(0);
  animation: title-breath 14s ease-in-out infinite;
}

@keyframes title-breath {
  0%,
  36% {
    opacity: 0;
    filter: blur(6px);
  }
  62% {
    opacity: 1;
    filter: blur(0);
  }
  78% {
    opacity: 0.88;
    filter: blur(0);
  }
  100% {
    opacity: 0;
    filter: blur(6px);
  }
}

.immersive-hud {
  position: fixed;
  top: 1.2rem;
  right: 1.2rem;
  display: flex;
  align-items: center;
  gap: 1rem;
  max-width: min(35rem, calc(100vw - 2.4rem));
  padding: 0.85rem 0.95rem;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: rgba(1, 9, 14, 0.62);
  backdrop-filter: blur(18px);
  box-shadow: 0 1rem 3rem rgba(0, 0, 0, 0.32), 0 0 2.6rem color-mix(in srgb, var(--realm-b) 18%, transparent);
  opacity: 0;
  pointer-events: none;
  transform: translateY(-0.5rem);
  transition: opacity 260ms ease, transform 260ms ease;
  z-index: 9;
}

.immersive-hud strong,
.immersive-hud span {
  display: block;
}

.immersive-hud strong {
  font-family: var(--calligraphy);
  font-size: 1rem;
  letter-spacing: 0.08em;
}

.immersive-hud span {
  margin-top: 0.2rem;
  color: var(--muted);
  font-size: 0.78rem;
  line-height: 1.5;
}

.immersive-hud button,
#immersive {
  border: 1px solid var(--line);
  border-radius: 8px;
  background: rgba(1, 9, 14, 0.5);
  color: var(--ink);
  cursor: pointer;
}

.immersive-hud button {
  min-width: 5.8rem;
  min-height: 2.4rem;
  padding: 0.45rem 0.75rem;
}

.immersive-controls {
  display: grid;
  grid-template-columns: repeat(3, minmax(7.2rem, 1fr));
  gap: 0.48rem 0.7rem;
  margin-top: 0.65rem;
  width: min(32rem, calc(100vw - 10rem));
}

.immersive-controls label {
  display: grid;
  grid-template-columns: 2.7rem minmax(0, 1fr);
  align-items: center;
  gap: 0.38rem;
  color: var(--muted);
  font-size: 0.72rem;
  letter-spacing: 0.06em;
}

.immersive-controls input[type="range"] {
  width: 100%;
  accent-color: var(--realm-a);
}

.immersive-controls input[type="color"] {
  width: 100%;
  height: 1.45rem;
  border: 1px solid var(--line);
  border-radius: 5px;
  padding: 0.1rem;
  background: rgba(1, 9, 14, 0.55);
}

.immersive-controls input[type="checkbox"] {
  justify-self: start;
  width: 1rem;
  height: 1rem;
  accent-color: var(--realm-a);
}

#immersive {
  border-radius: 50%;
}

.experience.is-immersive {
  min-height: 100vh;
  overflow: hidden;
}

.experience.is-immersive #energy-canvas {
  z-index: 4;
  cursor: grab;
}

.experience.is-immersive #energy-canvas:active {
  cursor: grabbing;
}

.experience.is-immersive .ambient-layer {
  z-index: 2;
}

.experience.is-immersive .site-header,
.experience.is-immersive .hero,
.experience.is-immersive .realms,
.experience.is-immersive .path,
.experience.is-immersive .scenes,
.experience.is-immersive .about {
  opacity: 0;
  pointer-events: none;
  transition: opacity 420ms ease;
}

.experience.is-immersive .player {
  z-index: 8;
  opacity: 0.86;
  transform: translateY(0);
  transition: opacity 320ms ease, transform 320ms ease;
}

.experience.is-immersive .immersive-hud {
  opacity: 1;
  pointer-events: auto;
  transform: translateY(0);
}

.experience.is-immersive.hud-idle .player,
.experience.is-immersive.hud-idle .immersive-hud {
  opacity: 0;
  pointer-events: none;
  transform: translateY(0.7rem);
}

.experience.is-immersive.hud-idle {
  cursor: none;
}

.guide-caption {
  position: fixed;
  top: 50%;
  right: clamp(1rem, 3.2vw, 3rem);
  bottom: auto;
  width: auto;
  max-width: min(12rem, calc(100vw - 2rem));
  height: min(74vh, 44rem);
  transform: translate(1rem, -50%);
  display: grid;
  place-items: center;
  padding: 1.1rem 0.85rem;
  color: color-mix(in srgb, var(--caption-color, var(--realm-a)) 78%, #fff 22%);
  font-family: var(--calligraphy);
  font-size: clamp(1.55rem, 2.2vw, 2.35rem);
  line-height: 1.95;
  letter-spacing: 0.1em;
  text-align: start;
  text-shadow:
    0 0 0.7rem color-mix(in srgb, var(--caption-color, var(--realm-a)) 70%, transparent),
    0 0 2.4rem color-mix(in srgb, var(--caption-color, var(--realm-a)) 42%, transparent),
    0 0 4.8rem rgba(255, 244, 206, 0.2);
  background: linear-gradient(90deg, transparent, rgba(0, 0, 0, 0.18));
  opacity: 0;
  pointer-events: none;
  z-index: 10;
  transition: opacity 980ms ease, transform 980ms ease, filter 980ms ease;
  filter: blur(5px);
  --caption-color: var(--realm-a);
}

.guide-caption.is-visible {
  opacity: 1;
  transform: translate(0, -50%);
  filter: blur(0);
}

.guide-caption-lines {
  writing-mode: vertical-rl;
  text-orientation: mixed;
  max-height: calc(min(74vh, 44rem) - 2.2rem);
  max-width: 10rem;
  overflow: hidden;
}

.experience.is-immersive .guide-caption {
  z-index: 11;
}

@media (max-width: 900px) {
  .desktop-nav {
    display: none;
  }

  .menu-button {
    display: block;
  }

  .site-header {
    padding: 1rem 1.2rem;
  }

  .brand strong {
    font-size: 0.95rem;
  }

  .brand em {
    font-size: 0.62rem;
  }

  .hero {
    min-height: 92vh;
    padding-top: 6rem;
    padding-bottom: 17rem;
  }

  .hero-copy {
    transform: none;
  }

  h1 {
    font-size: clamp(3.2rem, 13vw, 5rem);
  }

  .slogan {
    letter-spacing: 0.22em;
  }

  .energy-orbit {
    display: none;
  }

  .realm-stage {
    grid-template-columns: 1fr;
  }

  .realm-list {
    display: flex;
    overflow-x: auto;
    padding-bottom: 0.8rem;
    scroll-snap-type: x proximity;
  }

  .realm-node {
    flex: 0 0 10rem;
    scroll-snap-align: start;
  }

  .path-line {
    grid-template-columns: 1fr;
  }

  .path-line div {
    border-right: 0;
    border-bottom: 1px solid var(--line);
  }

  .path-line div:last-child {
    border-bottom: 0;
  }

  .player {
    grid-template-columns: 3.4rem 1fr;
    gap: 0.65rem;
    left: 0.8rem;
    right: 0.8rem;
    bottom: 0.8rem;
    padding: 0.72rem;
  }

  .player img {
    width: 3.4rem;
    height: 3.4rem;
  }

  .player-controls {
    grid-column: 1 / -1;
    justify-content: center;
    gap: 0.38rem;
  }

  .player-controls button {
    width: 2.45rem;
    height: 2.45rem;
  }

  .immersive-track-badge {
    top: 0.95rem;
    left: 0.95rem;
  }

  .player-controls .play-button {
    width: 3.15rem;
    height: 3.15rem;
  }

  .immersive-hud {
    left: 0.8rem;
    right: 0.8rem;
    top: 0.8rem;
    align-items: flex-start;
  }

  .immersive-controls {
    width: 100%;
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .guide-caption {
    right: 0.8rem;
    width: auto;
    max-width: min(10rem, calc(100vw - 1.6rem));
    height: min(66vh, 38rem);
    padding: 0.6rem 0.85rem;
  }
}

@media (max-width: 540px) {
  .hero-actions {
    align-items: stretch;
    flex-direction: column;
  }

  .primary-action,
  .secondary-action {
    width: 100%;
  }

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

  .section-heading h2 {
    letter-spacing: 0.08em;
  }

  .active-realm {
    display: grid;
    grid-template-columns: 6rem 1fr;
    gap: 1rem;
    align-items: center;
  }

  .active-realm img {
    align-self: start;
  }

  .realm-index {
    margin-top: 0;
  }

  .active-realm h3 {
    font-size: 1.7rem;
  }

  .track-desc {
    font-size: 0.92rem;
  }

  .visual-controls {
    grid-column: 1 / -1;
  }

  .visual-controls label {
    grid-template-columns: 4.8rem 1fr;
  }

  .immersive-hud {
    display: grid;
  }

  .immersive-controls {
    grid-template-columns: 1fr;
  }

  .progress-wrap {
    grid-template-columns: 1fr;
    gap: 0.25rem;
  }

  .progress-wrap span {
    display: none;
  }

  .guide-caption {
    top: 50%;
    right: 0.7rem;
    bottom: auto;
    width: auto;
    max-width: 7.5rem;
    height: min(58vh, 32rem);
    transform: translate(0.7rem, -50%);
    font-size: 1.35rem;
    line-height: 1.8;
    letter-spacing: 0.08em;
  }

  .guide-caption.is-visible {
    transform: translate(0, -50%);
  }
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}