* {
  box-sizing: border-box;
}

html,
body {
  width: 100%;
  height: 100%;
  margin: 0;
  background: #0b2948;
  overflow: hidden;
  font-family: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
}

.stage {
  position: relative;
  width: 100vw;
  height: 100vh;
  background: #f5ab43;
  overflow: hidden;
}

.video-scene,
.poster-scene,
.ripple-layer {
  position: absolute;
  inset: 0;
}

.video-scene {
  z-index: 3;
  background: #0b2948;
  transition: opacity 1100ms ease, filter 1100ms ease;
}

.video-scene.is-fading {
  opacity: 0;
  filter: blur(8px);
  pointer-events: none;
}

video {
  width: 100%;
  height: 100%;
  display: block;
  object-fit: cover;
  background: #0b2948;
}

.poster-scene {
  z-index: 1;
  display: grid;
  place-items: center;
  background:
    radial-gradient(circle at 50% 50%, rgba(255, 248, 225, 0.22), transparent 28%),
    #f5ab43;
  clip-path: circle(0% at 50% 50%);
}

.poster-scene.is-revealed {
  animation: revealPoster 2100ms cubic-bezier(0.22, 0.88, 0.22, 1) forwards;
}

.poster-scene img {
  width: 100vw;
  height: 100vh;
  object-fit: contain;
  filter: saturate(1.03) contrast(1.02);
}

.ripple-layer {
  z-index: 2;
  display: grid;
  place-items: center;
  opacity: 0;
  pointer-events: none;
}

.ripple-layer.is-active {
  opacity: 1;
}

.ripple {
  position: absolute;
  width: 16vmin;
  aspect-ratio: 1;
  border: 2px solid rgba(255, 248, 225, 0.78);
  border-radius: 50%;
  box-shadow:
    0 0 22px rgba(255, 248, 225, 0.34),
    inset 0 0 18px rgba(255, 248, 225, 0.16);
  opacity: 0;
}

.ripple-layer.is-active .ripple-a {
  animation: ripple 1700ms ease-out forwards;
}

.ripple-layer.is-active .ripple-b {
  animation: ripple 1900ms 170ms ease-out forwards;
}

.ripple-layer.is-active .ripple-c {
  animation: ripple 2200ms 320ms ease-out forwards;
}

.play-fallback {
  position: fixed;
  left: 50%;
  bottom: 32px;
  z-index: 5;
  transform: translateX(-50%);
  border: 0;
  border-radius: 999px;
  padding: 12px 22px;
  color: #fff8e1;
  background: rgba(11, 41, 72, 0.9);
  font-size: 16px;
  letter-spacing: 0;
  cursor: pointer;
  opacity: 0;
  pointer-events: none;
  transition: opacity 220ms ease;
}

.play-fallback.is-visible {
  opacity: 1;
  pointer-events: auto;
}

@keyframes revealPoster {
  0% {
    clip-path: circle(0% at 50% 50%);
    filter: brightness(1.12) blur(8px);
  }
  42% {
    clip-path: circle(34% at 50% 50%);
    filter: brightness(1.08) blur(2px);
  }
  100% {
    clip-path: circle(150% at 50% 50%);
    filter: brightness(1) blur(0);
  }
}

@keyframes ripple {
  0% {
    transform: scale(0.22);
    opacity: 0.9;
  }
  60% {
    opacity: 0.45;
  }
  100% {
    transform: scale(9);
    opacity: 0;
  }
}

@media (prefers-reduced-motion: reduce) {
  .video-scene,
  .poster-scene,
  .ripple {
    animation: none !important;
    transition: none !important;
  }

  .poster-scene.is-revealed {
    clip-path: none;
  }
}