.scene {
  position: relative;
  width: 100%;
  height: 100%;
  overflow: hidden;

  --scene-ratio-num: 1.7777778;
  --scene-ratio-inv: 0.5625;
  --scene-ratio: 16 / 9;
}

.scene-blur {
  position: absolute;
  inset: -24px;
  width: calc(100% + 48px);
  height: calc(100% + 48px);
  object-fit: cover;
  object-position: center;
  filter: blur(24px) saturate(1.08) brightness(0.75);
  transform: scale(1.04);
  z-index: 0;
  pointer-events: none;
  user-select: none;
}

.scene-stage { 
  position: absolute; 
  left: 50%; 
  top: 50%; 
  transform: translate(-50%, -50%); 
  width: min(100vw, calc(100vh * var(--scene-ratio-num))); 
  aspect-ratio: var(--scene-ratio); 
  z-index: 1; 
}

.scene-main {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: contain; 
  object-position: center;
  pointer-events: none;
  user-select: none;
}

.intro-card {
  position: absolute;
  left: 56%;
  top: 20%;
  transform: translate(-50%, -50%);
  width: clamp(220px, 24vw, 340px);
  aspect-ratio: 320 / 130;
  z-index: 2;

  opacity: 0;
  visibility: hidden;
  pointer-events: none;
  transition: opacity 0.35s ease, visibility 0.35s ease;
}

.intro-card.is-visible {
  opacity: 1;
  visibility: visible;
}

.intro-card__img {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: fill;
  pointer-events: none;
  user-select: none;
}

.intro-text {
  margin: 0;
  font-family: var(--ui-font-family);
  font-size: var(--intro-font-size);
  font-weight: 700;
  line-height: 1.22;
  text-align: center;
  opacity: 0;
  visibility: hidden;
  transition: opacity 0.45s ease, visibility 0.45s ease;
  pointer-events: none;
}

.intro-text.is-visible {
  opacity: 1;
  visibility: visible;
}

.intro-text .line,
.paper-text .line {
  display: block;
  width: 100%;
}

.paper-text .line {
  padding: 0;
}

.intro-text .char,
.paper-text .char {
  opacity: 0;
  transition: opacity 0.2s linear;
}

.intro-text .char.is-visible,
.paper-text .char.is-visible {
  opacity: 1;
}

.intro-text--cloud {
  position: absolute;
  inset: 0;
  padding: clamp(8px, 1.1vw, 14px) clamp(10px, 1.3vw, 18px);
  color: var(--cloud-color);

  display: grid;
  align-content: center;
  justify-items: center;
  text-align: center;
}

.intro-text--cloud .line {
  white-space: nowrap;
}

.intro-text--wish {
  position: absolute;
  left: 60%;
  top: 40%;
  transform: translate(-50%, -50%);
  width: clamp(240px, 30vw, 420px);
  min-height: clamp(72px, 10vh, 140px);
  padding: clamp(6px, 1vw, 12px);
  color: var(--wish-color);
  z-index: 3;
}

.continue-btn {
  position: absolute;
  left: 68%;
  top: 55%;
  transform: translate(-50%, -50%);
  z-index: 4;

  margin: 0;
  padding: 0;
  border: 0;
  background: transparent;

  font-family: var(--ui-font-family);
  font-size: var(--continue-font-size);
  line-height: 1;
  font-weight: 700;
  white-space: nowrap;
  color: #ffffff;
  letter-spacing: 0.3px;

  cursor: pointer;
  user-select: none;
  touch-action: manipulation;

  animation: glowPulse 3s ease-in-out infinite;
  transition: opacity 0.2s ease, visibility 0.2s ease;
}

.continue-btn.is-hidden {
  opacity: 0;
  visibility: hidden;
  pointer-events: none;
}

@keyframes glowPulse {
  0%,
  100% {
    opacity: 0.72;
    text-shadow:
      0 0 4px rgba(255, 255, 255, 0.45),
      0 0 10px rgba(255, 255, 255, 0.35),
      0 0 18px rgba(180, 230, 255, 0.25);
  }

  50% {
    opacity: 1;
    text-shadow:
      0 0 8px rgba(255, 255, 255, 0.95),
      0 0 18px rgba(255, 255, 255, 0.75),
      0 0 30px rgba(150, 220, 255, 0.55),
      0 0 46px rgba(120, 190, 255, 0.35);
  }
}

@media (max-width: 1200px) {
  .intro-card {
    left: 54%;
    top: 19%;
    width: clamp(210px, 28vw, 320px);
  }

  .intro-text--wish {
    left: 57%;
    top: 39%;
    width: clamp(230px, 38vw, 390px);
  }

  .continue-btn {
    left: 62%;
    top: 55%;
  }
}

@media (max-width: 900px) {
  .scene-blur {
    filter: blur(16px) saturate(1.05) brightness(0.8);
    inset: -16px;
    width: calc(100% + 32px);
    height: calc(100% + 32px);
  }

  .intro-card {
    left: 66%;
    top: 24%;
    width: clamp(140px, 40vw, 210px);
  }

  .intro-text--cloud .line {
    white-space: normal;
  }

  .intro-text--wish {
    left: 62%;
    width: min(62vw, 250px);
    min-height: auto;
    text-align: center;
  }

  .continue-btn {
    left: 59%;
    top: 66%;
    font-size: clamp(13px, 3.6vw, 18px);
  }

  .intro-text {
    font-size: calc(var(--intro-font-size) * 0.88);
    line-height: 1.18;
  }

  .intro-text--wish {
    font-size: calc(var(--intro-font-size) * 0.84);
  }

  .continue-btn {
    font-size: calc(var(--continue-font-size) * 0.84);
  }
}  

@media (max-width: 600px) {
  .intro-card {
    left: 54%;
    top: 14%;
    width: clamp(100px, 46vw, 180px);
  }

  .intro-text--wish {
    left: 61%;
    top: 37%;
    width: min(64vw, 230px);
    font-size: clamp(10px, 1vw, 10px);
  }

  .continue-btn {
    left: 69%;
    top: 55%;
    font-size: clamp(12px, 1.8vw, 13px);
  }
}

@media (max-height: 500px) and (orientation: landscape) {
  .scene-stage {
    width: min(100vw, calc(100dvh * var(--scene-ratio-num)));
    height: min(100dvh, calc(100vw * var(--scene-ratio-inv)));
  }

  .intro-card {
    top: 16%;
    width: clamp(170px, 26vw, 260px);
  }

  .intro-text--wish {
    top: 34%;
    width: clamp(220px, 34vw, 340px);
  }

  .continue-btn {
    top: 54%;
  }
}

@media (prefers-reduced-motion: reduce) {
  .continue-btn {
    animation: none;
    opacity: 1;
  }

  .intro-text .char,
  .paper-text .char {
    transition: none;
  }
}