:root {
  --bg-image: url("./assets/bg-linnea-20260224.jpg");
}

@font-face {
  font-family: "HK4E";
  src: url("./assets/fonts/hk4e_zh-cn.ttf") format("truetype");
  font-display: swap;
}

* {
  box-sizing: border-box;
}

html,
body {
  width: 100%;
  height: 100%;
  margin: 0;
  overflow: hidden;
  background: #000;
  user-select: none;
  -webkit-user-select: none;
}

.scene {
  position: relative;
  width: 100vw;
  height: 100vh;
  overflow: hidden;
  cursor: default;
}

.start-hint {
  position: absolute;
  left: 50%;
  top: 50%;
  transform: translate(-50%, -50%);
  z-index: 10;
  color: rgba(255, 255, 255, 0.78);
  font-family: "HK4E", "Noto Serif SC", serif;
  font-size: clamp(12px, 1.1vw, 15px);
  letter-spacing: 0.2em;
  text-shadow: 0 0 12px rgba(0, 0, 0, 0.6);
  opacity: 0.95;
  transition: opacity 0.45s ease;
  pointer-events: none;
}

.scene.phase-1 .start-hint,
.scene.phase-2 .start-hint,
.scene.merging .start-hint,
.scene.show-poster .start-hint {
  opacity: 0;
}

.bg {
  position: absolute;
  inset: 0;
  background: var(--bg-image) center center / cover no-repeat;
  transform: translate3d(0, 0, 0) scale(1.08);
  will-change: transform;
}

.blackout {
  position: absolute;
  inset: 0;
  background: #000;
  opacity: 1;
  transition: opacity 1.8s ease;
  z-index: 2;
  pointer-events: none;
}

.scene.reveal-bg .blackout,
.scene.merging .blackout {
  opacity: 0;
}

.elements {
  position: absolute;
  inset: 0;
  z-index: 3;
  pointer-events: none;
  opacity: 1;
  transition: opacity 1.8s ease;
}

.scene.merging .elements {
  opacity: 0;
}

.element {
  position: absolute;
  left: 50%;
  top: 50%;
  width: min(19vw, 240px);
  height: auto;
  opacity: 0;
  filter: none;
  transform: translate(-50%, -50%);
}

.scene.phase-1 .element {
  animation:
    element-fade-in 2.8s ease forwards,
    subtle-fade 8s ease-in-out 2.8s infinite alternate;
}

.scene.phase-2 .element {
  opacity: 0.86;
}

.reaction {
  position: absolute;
  left: 50%;
  top: 50%;
  width: 88px;
  height: 88px;
  border-radius: 999px;
  pointer-events: none;
  z-index: 4;
  transform: translate(-50%, -50%) scale(0.2);
  opacity: 0;
  background: radial-gradient(circle, rgba(255, 244, 204, 0.95) 0%, rgba(255, 230, 150, 0.38) 34%, rgba(255, 230, 150, 0.08) 62%, rgba(255, 230, 150, 0) 76%);
  mix-blend-mode: screen;
  transition: opacity 90ms linear, transform 90ms linear;
}

.scene.overlap .reaction {
  box-shadow: 0 0 48px rgba(255, 234, 166, 0.85);
}

.poster-stage {
  position: absolute;
  inset: 0;
  z-index: 6;
  pointer-events: none;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 12px;
}

.scene.hover-ready .poster-stage {
  pointer-events: auto;
}

.poster-image {
  width: min(66vw, 1050px);
  max-height: 68vh;
  object-fit: contain;
  opacity: 0;
  filter: drop-shadow(0 16px 50px rgba(0, 0, 0, 0.28)) brightness(1);
  transform: scale(1);
  pointer-events: none;
  will-change: opacity, transform, filter;
  transition:
    opacity var(--poster-hover-duration, 0.95s) ease,
    transform var(--poster-hover-duration, 0.95s) ease,
    filter var(--poster-hover-duration, 0.95s) ease;
}

.scene.show-poster .poster-image {
  animation: poster-fade-in 2.8s linear forwards;
}

.scene.show-poster.poster-drift .poster-image {
  opacity: 0.4;
  animation: poster-opacity-drift 4.8s linear infinite;
}

.scene.hover-ready .poster-image {
  pointer-events: auto;
}

.scene.hover-ready.show-poster .poster-image.poster-freeze {
  animation: none !important;
}

.scene.hover-ready.show-poster .poster-image.poster-hovering {
  opacity: 1;
  transform: scale(1.045);
  filter: drop-shadow(0 16px 50px rgba(0, 0, 0, 0.28)) brightness(1.24);
}

.poster-copy {
  margin-top: -6px;
  text-align: center;
  color: rgba(245, 247, 255, 0.9);
  text-shadow: 0 0 22px rgba(180, 215, 255, 0.2);
  display: flex;
  flex-direction: column;
  align-items: center;
  row-gap: 16px;
}

.poster-copy p {
  margin: 0;
  font-family: "HK4E", "Noto Serif SC", serif;
  font-size: clamp(12px, 1.15vw, 16px);
  letter-spacing: 0.42em;
  opacity: 0;
  transform: translateY(8px);
  transition: opacity 0.8s ease, transform 0.8s ease;
}

.scene.show-poster .poster-copy .line-1 {
  opacity: 0.92;
  transform: translateY(0);
  transition-delay: 1.05s;
}

.scene.show-poster .poster-copy .line-2 {
  opacity: 0.92;
  transform: translateY(0);
  transition-delay: 1.35s;
}

.scene.show-poster .poster-copy .line-3 {
  opacity: 0.72;
  transform: translateX(-50%) translateY(0);
  transition-delay: 1.65s;
}

.copy-cn {
  margin-top: 8px;
}

.copy-en {
  margin-top: 0;
}

.copy-soon {
  position: fixed;
  left: 50%;
  bottom: clamp(20px, 4vh, 42px);
  transform: translateX(-50%) translateY(8px);
  margin-top: 0;
  color: rgba(233, 237, 247, 0.46);
}

.copy-soon .soon-line {
  display: inline-block;
}

.copy-soon .soon-line + .soon-line {
  margin-left: 0.9em;
}

.scene.hide-elements .element {
  opacity: 0 !important;
  animation: none !important;
  transition: opacity 1.6s ease !important;
}

@keyframes element-fade-in {
  0% {
    opacity: 0;
  }
  100% {
    opacity: 0.86;
  }
}

@keyframes subtle-fade {
  0% {
    opacity: 0.7;
  }
  50% {
    opacity: 0.98;
  }
  100% {
    opacity: 0.72;
  }
}

@keyframes poster-fade-in {
  0% {
    opacity: 0;
  }
  100% {
    opacity: 0.4;
  }
}

@keyframes poster-opacity-drift {
  0% {
    opacity: 0.4;
  }
  50% {
    opacity: 0.1;
  }
  100% {
    opacity: 0.4;
  }
}

@media (max-width: 900px) {
  .element {
    width: min(30vw, 200px);
  }

  .poster-image {
    width: min(90vw, 760px);
    max-height: 60vh;
  }

  .copy-cn {
    letter-spacing: 0.3em;
  }

  .copy-en {
    letter-spacing: 0.3em;
  }

  .copy-soon {
    letter-spacing: 0.3em;
    text-align: center;
    line-height: 1.8;
  }

  .copy-soon .soon-line {
    display: block;
  }

  .copy-soon .soon-line + .soon-line {
    margin-left: 0;
  }
}