:root {
  --bg: #070809;
  --accent: #f0c88a;
  --text: rgba(255, 255, 255, 0.94);
}

* {
  box-sizing: border-box;
  -webkit-tap-highlight-color: transparent;
}

html,
body {
  margin: 0;
  width: 100%;
  height: 100%;
  overflow: hidden;
  background: var(--bg);
  touch-action: manipulation;
  font-family: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
}

body {
  color: var(--text);
}

button,
input {
  font: inherit;
}

.stage {
  --ambient-energy: 0.68;
  --ambient-highlight: 0.62;
  --ambient-shift-x: 0px;
  --ambient-shift-y: 0px;
  --ambient-tilt: 0deg;
  --ambient-scale: 1;
  --progress: 0%;
  position: fixed;
  inset: 0;
  overflow: hidden;
  isolation: isolate;
  user-select: none;
  -webkit-user-select: none;
  background:
    radial-gradient(circle at 50% 46%, rgba(255, 255, 255, 0.035), transparent 32%),
    linear-gradient(180deg, #121417 0%, #090909 56%, #040404 100%);
}

.ambient-backdrop,
.frost-layer,
.video-shell,
.start-btn,
.skip-btn,
.center-state,
.dy-progress {
  position: absolute;
}

.ambient-backdrop {
  inset: -18%;
  z-index: 0;
  pointer-events: none;
  opacity: calc(0.72 + var(--ambient-energy) * 0.18);
  transform:
    translate3d(var(--ambient-shift-x), var(--ambient-shift-y), 0)
    rotate(var(--ambient-tilt))
    scale(var(--ambient-scale));
  filter:
    saturate(calc(1.02 + var(--ambient-energy) * 0.38))
    brightness(calc(0.96 + var(--ambient-highlight) * 0.14));
  transition:
    opacity 260ms ease,
    transform 900ms ease,
    filter 320ms ease;
}

.ambient-backdrop::before,
.ambient-backdrop::after {
  content: "";
  position: absolute;
  inset: 0;
}

.ambient-backdrop::before {
  background:
    radial-gradient(circle at 50% 44%, rgba(255, 255, 255, 0.15), transparent 26%),
    radial-gradient(circle at 52% 52%, rgba(255, 221, 172, 0.1), transparent 42%);
  filter: blur(56px);
  opacity: 0.92;
}

.ambient-backdrop::after {
  background:
    linear-gradient(180deg, rgba(0, 0, 0, 0.2) 0%, transparent 28%, transparent 74%, rgba(0, 0, 0, 0.3) 100%),
    radial-gradient(circle at 50% 50%, transparent 40%, rgba(0, 0, 0, 0.28) 100%);
}

.ambient-blob,
.ambient-band {
  position: absolute;
  pointer-events: none;
}

.ambient-blob {
  border-radius: 50%;
  filter: blur(120px);
  mix-blend-mode: screen;
  opacity: 0.94;
}

.ambient-blob-a {
  width: min(88vw, 88vh);
  height: min(88vw, 88vh);
  left: -8vw;
  top: 3vh;
  background:
    radial-gradient(circle at 40% 38%, rgba(243, 247, 255, 0.92), rgba(147, 168, 238, 0.38) 30%, rgba(36, 48, 81, 0.06) 72%, transparent 100%);
  animation: blobFloatA 20s ease-in-out infinite alternate;
}

.ambient-blob-b {
  width: min(102vw, 102vh);
  height: min(102vw, 102vh);
  right: -20vw;
  top: 18vh;
  background:
    radial-gradient(circle at 56% 44%, rgba(255, 225, 176, 0.86), rgba(255, 168, 103, 0.32) 32%, rgba(87, 41, 18, 0.08) 70%, transparent 100%);
  animation: blobFloatB 24s ease-in-out infinite alternate;
}

.ambient-blob-c {
  width: min(74vw, 74vh);
  height: min(74vw, 74vh);
  left: 24vw;
  bottom: -24vh;
  background:
    radial-gradient(circle at 52% 40%, rgba(225, 235, 255, 0.52), rgba(128, 148, 214, 0.2) 30%, rgba(24, 31, 49, 0.04) 72%, transparent 100%);
  animation: blobFloatC 26s ease-in-out infinite alternate;
}

.ambient-band {
  left: 10%;
  right: 10%;
  border-radius: 999px;
  filter: blur(72px);
  opacity: 0.4;
}

.ambient-band-a {
  top: 14%;
  height: 18%;
  background: linear-gradient(90deg, rgba(255, 255, 255, 0.02), rgba(255, 241, 213, 0.24), rgba(255, 255, 255, 0.02));
  animation: bandSweepA 18s ease-in-out infinite alternate;
}

.ambient-band-b {
  bottom: 12%;
  height: 16%;
  background: linear-gradient(90deg, rgba(255, 255, 255, 0.02), rgba(189, 209, 255, 0.18), rgba(255, 255, 255, 0.02));
  animation: bandSweepB 21s ease-in-out infinite alternate;
}

.frost-layer {
  inset: 0;
  z-index: 1;
  pointer-events: none;
  background:
    radial-gradient(circle at 50% 48%, rgba(255, 255, 255, 0.075), rgba(0, 0, 0, 0.18) 58%, rgba(0, 0, 0, 0.34) 100%),
    linear-gradient(180deg, rgba(255, 255, 255, 0.045), rgba(255, 255, 255, 0.018) 24%, rgba(0, 0, 0, 0.16) 100%);
  backdrop-filter: blur(22px) saturate(132%);
  -webkit-backdrop-filter: blur(22px) saturate(132%);
  opacity: calc(0.82 + var(--ambient-energy) * 0.08);
  transition: opacity 240ms ease;
}

.video-shell {
  inset: 0;
  z-index: 3;
  display: flex;
  align-items: center;
  justify-content: center;
}

.video-main {
  width: 100vw;
  height: 100vh;
  object-fit: contain;
  object-position: center center;
  display: block;
  background: transparent;
  filter: drop-shadow(0 14px 28px rgba(0, 0, 0, 0.42));
}

.start-btn,
.skip-btn,
.center-state,
.dy-progress {
  opacity: 0;
  pointer-events: none;
  transition:
    opacity 180ms ease,
    transform 220ms ease;
}

.start-btn {
  left: 50%;
  top: 50%;
  z-index: 7;
  display: none;
  align-items: center;
  justify-content: center;
  gap: 10px;
  min-width: min(78vw, 288px);
  max-width: min(84vw, 320px);
  min-height: 54px;
  padding: 0 22px;
  border: 1px solid rgba(255, 255, 255, 0.16);
  border-radius: 999px;
  background: rgba(8, 8, 8, 0.48);
  color: rgba(255, 255, 255, 0.96);
  text-align: center;
  line-height: 1.35;
  backdrop-filter: blur(18px) saturate(138%);
  -webkit-backdrop-filter: blur(18px) saturate(138%);
  box-shadow: 0 18px 44px rgba(0, 0, 0, 0.26);
  transform: translate(-50%, -50%);
}

.start-btn[data-mode="loading"] {
  opacity: 1;
}

.start-btn[data-mode="loading"]::before {
  content: "";
  width: 16px;
  height: 16px;
  border-radius: 50%;
  border: 2px solid rgba(255, 255, 255, 0.2);
  border-top-color: rgba(255, 255, 255, 0.94);
  animation: spin 0.82s linear infinite;
}

.start-btn[data-mode="prompt"] {
  opacity: 1;
  pointer-events: auto;
  background: rgba(8, 8, 8, 0.56);
}

.start-btn[data-mode="prompt"]::before {
  content: "";
  width: 14px;
  height: 14px;
  margin-left: 2px;
  background: rgba(255, 255, 255, 0.96);
  clip-path: polygon(8% 0, 100% 50%, 8% 100%);
}

.skip-btn {
  top: calc(16px + env(safe-area-inset-top));
  right: calc(16px + env(safe-area-inset-right));
  z-index: 7;
  min-width: 66px;
  height: 34px;
  padding: 0 14px;
  border: 1px solid rgba(255, 255, 255, 0.16);
  border-radius: 999px;
  background: rgba(10, 10, 10, 0.44);
  color: var(--text);
  font-size: 13px;
  letter-spacing: 0.05em;
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  transform: translateY(-6px);
}

.center-state {
  left: 50%;
  top: 50%;
  width: 78px;
  height: 78px;
  z-index: 6;
  border: 1px solid rgba(255, 255, 255, 0.14);
  border-radius: 50%;
  background: rgba(10, 10, 10, 0.34);
  backdrop-filter: blur(18px) saturate(136%);
  -webkit-backdrop-filter: blur(18px) saturate(136%);
  transform: translate(-50%, -50%) scale(0.92);
}

.icon-play,
.icon-pause {
  position: absolute;
  inset: 0;
}

.icon-play::before {
  content: "";
  position: absolute;
  left: 31px;
  top: 24px;
  width: 22px;
  height: 30px;
  background: rgba(255, 255, 255, 0.97);
  clip-path: polygon(0 0, 100% 50%, 0 100%);
}

.icon-pause::before,
.icon-pause::after {
  content: "";
  position: absolute;
  top: 23px;
  width: 8px;
  height: 32px;
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.97);
}

.icon-pause::before {
  left: 26px;
}

.icon-pause::after {
  right: 26px;
}

.center-state[data-state="play"] .icon-pause,
.center-state[data-state="pause"] .icon-play {
  opacity: 0;
}

.center-state[data-state="play"] .icon-play,
.center-state[data-state="pause"] .icon-pause {
  opacity: 1;
}

.dy-progress {
  left: 12px;
  right: 12px;
  bottom: calc(10px + env(safe-area-inset-bottom));
  z-index: 7;
  padding: 8px 0;
  transform: translateY(8px);
}

.progress-meta {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 6px;
  color: rgba(255, 255, 255, 0.92);
  font-size: 11px;
  line-height: 1;
  letter-spacing: 0.04em;
  font-variant-numeric: tabular-nums;
  text-shadow: 0 1px 4px rgba(0, 0, 0, 0.42);
  pointer-events: none;
}

.progress-range {
  appearance: none;
  -webkit-appearance: none;
  width: 100%;
  height: 20px;
  margin: 0;
  padding: 0;
  background: transparent;
  touch-action: pan-y;
}

.progress-range:focus {
  outline: none;
}

.progress-range:disabled {
  opacity: 0.55;
}

.progress-range::-webkit-slider-runnable-track {
  height: 3px;
  border-radius: 999px;
  background:
    linear-gradient(90deg, rgba(255, 255, 255, 0.98) 0 var(--progress), rgba(255, 255, 255, 0.26) var(--progress) 100%);
}

.progress-range::-webkit-slider-thumb {
  -webkit-appearance: none;
  appearance: none;
  width: 12px;
  height: 12px;
  margin-top: -4.5px;
  border: 0;
  border-radius: 50%;
  background: #fff8ea;
  box-shadow: 0 0 0 4px rgba(255, 255, 255, 0.12);
}

.progress-range::-moz-range-track {
  height: 3px;
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.26);
}

.progress-range::-moz-range-progress {
  height: 3px;
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.98);
}

.progress-range::-moz-range-thumb {
  width: 12px;
  height: 12px;
  border: 0;
  border-radius: 50%;
  background: #fff8ea;
  box-shadow: 0 0 0 4px rgba(255, 255, 255, 0.12);
}

.stage.ui-visible .skip-btn,
.stage.ui-visible .center-state,
.stage.ui-visible .dy-progress {
  opacity: 1;
  pointer-events: auto;
}

.stage.ui-visible .skip-btn {
  transform: translateY(0);
}

.stage.ui-visible .center-state {
  transform: translate(-50%, -50%) scale(1);
}

.stage.ui-visible .dy-progress {
  transform: translateY(0);
}

.stage[data-playback="loading"] .ambient-backdrop,
.stage[data-playback="buffering"] .ambient-backdrop {
  opacity: 0.9;
  filter: saturate(1.16) brightness(1.05);
}

.stage[data-playback="paused"] .ambient-backdrop,
.stage[data-playback="prompt"] .ambient-backdrop {
  opacity: 0.84;
  filter: saturate(1.08) brightness(1.02);
}

.stage[data-playback="playing"] .frost-layer {
  opacity: calc(0.8 + var(--ambient-energy) * 0.1);
}

@keyframes spin {
  to {
    transform: rotate(360deg);
  }
}

@keyframes blobFloatA {
  from {
    transform: translate3d(-2%, -2%, 0) scale(1);
  }
  to {
    transform: translate3d(8%, 5%, 0) scale(1.08);
  }
}

@keyframes blobFloatB {
  from {
    transform: translate3d(4%, -4%, 0) scale(1.02);
  }
  to {
    transform: translate3d(-8%, 7%, 0) scale(1.1);
  }
}

@keyframes blobFloatC {
  from {
    transform: translate3d(-4%, 0, 0) scale(0.98);
  }
  to {
    transform: translate3d(6%, -8%, 0) scale(1.06);
  }
}

@keyframes bandSweepA {
  from {
    transform: translate3d(-4%, 0, 0);
  }
  to {
    transform: translate3d(6%, 0, 0);
  }
}

@keyframes bandSweepB {
  from {
    transform: translate3d(4%, 0, 0);
  }
  to {
    transform: translate3d(-6%, 0, 0);
  }
}

@media (prefers-reduced-motion: reduce) {
  .ambient-blob,
  .ambient-band,
  .start-btn::before {
    animation: none !important;
  }

  .ambient-backdrop,
  .frost-layer,
  .skip-btn,
  .center-state,
  .dy-progress {
    transition-duration: 0.01ms;
  }
}