:root {
  --arc-card-size: clamp(118px, 10.2vw, 176px);
}

.intro-space {
  overflow: visible;
  padding-top: 130px;
}

.intro-space::before {
  content: "";
  position: absolute;
  inset: 0 0 auto;
  height: min(1200px, 140svh);
  pointer-events: none;
  opacity: .18;
  background-image:
    linear-gradient(rgb(255 255 255 / .055) 1px, transparent 1px),
    linear-gradient(90deg, rgb(255 255 255 / .04) 1px, transparent 1px);
  background-size: 76px 76px;
  mask-image: radial-gradient(circle at 50% 48%, #000 0 18%, transparent 72%);
}

.intro-space .arc-collage {
  width: 100%;
  height: clamp(980px, 125svh, 1120px);
  min-height: 980px;
  aspect-ratio: auto;
  margin: 0 auto 170px;
  overflow: visible;
  cursor: grab;
  touch-action: pan-y;
  user-select: none;
  perspective: 1400px;
  isolation: isolate;
  opacity: 1;
  transform: none;
  --title-opacity: 0;
  --title-scale: .88;
}

.intro-space .arc-collage.is-dragging {
  cursor: grabbing;
}

.intro-space .arc-collage::before,
.intro-space .arc-collage::after {
  content: "";
  position: absolute;
  inset: 0;
  z-index: 0;
  pointer-events: none;
}

.intro-space .arc-collage::before {
  opacity: .22;
  background:
    radial-gradient(circle at 50% 50%, rgb(255 255 255 / .055), transparent 38%),
    radial-gradient(circle at 50% 50%, transparent 46%, rgb(0 0 0 / .5) 100%);
}

.intro-space .arc-collage::after {
  opacity: .18;
  background: linear-gradient(100deg, transparent 32%, rgb(255 255 255 / .12), transparent 60%);
  transform: translateX(-115%);
  animation: collageSweep 7s ease-in-out infinite;
}

@keyframes collageSweep {
  0%, 44% { transform: translateX(-115%); }
  72%, 100% { transform: translateX(115%); }
}

.intro-space .arc-collage .collage-card {
  width: var(--arc-card-size);
  height: var(--arc-card-size);
  aspect-ratio: auto;
  border-radius: clamp(15px, 1.4vw, 24px);
  opacity: 0;
  transform: translate(-50%, -50%) scale(.05);
  transform-origin: center;
  pointer-events: auto;
  transition: box-shadow .35s var(--ease);
  will-change: transform, opacity, filter;
}

.intro-space .arc-collage .collage-card:hover {
  box-shadow:
    0 30px 70px rgb(0 0 0 / .62),
    0 0 0 1px rgb(255 255 255 / .2);
}

.intro-space .arc-collage .mini-art.b::after {
  letter-spacing: 0;
}

.intro-space .arc-collage .collage-title {
  z-index: 30;
  display: grid;
  justify-items: center;
  gap: 18px;
  opacity: var(--title-opacity);
  transform: translate(-50%, -50%) scale(var(--title-scale));
  filter: blur(var(--title-blur, 8px));
  transition: none;
}

@media (prefers-reduced-motion: reduce) {
  .intro-space .arc-collage::after {
    animation: none;
  }
}

.intro-space .arc-collage .collage-title strong {
  display: grid;
  justify-items: center;
  gap: clamp(8px, 1.1vw, 14px);
  color: #f5f3ee;
  line-height: .88;
  text-shadow: 0 18px 48px rgb(0 0 0 / .72);
}

.intro-space .arc-collage .collage-title .collage-title-cn,
.intro-space .arc-collage .collage-title .collage-title-en {
  margin: 0;
}

.intro-space .arc-collage .collage-title .collage-title-cn {
  color: #f5f3ee;
  font-size: clamp(58px, 7.3vw, 112px);
  font-weight: 700;
  letter-spacing: .02em;
}

.intro-space .arc-collage .collage-title .collage-title-cn b,
.intro-space .arc-collage .collage-title .collage-title-en b {
  color: var(--lime);
  font: inherit;
}

.intro-space .arc-collage .collage-title .collage-title-en {
  color: #f5f3ee;
  font-size: clamp(20px, 2.6vw, 42px);
  font-weight: 700;
  letter-spacing: .16em;
  line-height: .92;
}

.intro-space .arc-collage .collage-title .eyebrow {
  margin: 0;
  color: rgb(255 255 255 / .48);
  font-size: 10px;
  font-weight: 500;
  letter-spacing: .22em;
}

@media (max-width: 900px) {
  :root {
    --arc-card-size: clamp(88px, 15vw, 126px);
  }

  .intro-space {
    padding-top: 100px;
  }

  .intro-space .arc-collage {
    height: clamp(820px, 118svh, 980px);
    min-height: 820px;
    margin-bottom: 130px;
  }
}

@media (max-width: 560px) {
  :root {
    --arc-card-size: clamp(60px, 16vw, 72px);
  }

  .intro-space .arc-collage {
    width: 100vw;
    height: 820px;
    min-height: 820px;
    margin-left: calc(50% - 50vw);
    margin-bottom: 100px;
  }

  .intro-space .arc-collage .collage-title {
    gap: 13px;
  }

  .intro-space .arc-collage .collage-title strong {
    gap: 8px;
  }

  .intro-space .arc-collage .collage-title .collage-title-cn {
    font-size: clamp(42px, 13vw, 58px);
  }

  .intro-space .arc-collage .collage-title .collage-title-en {
    max-width: 15em;
    font-size: clamp(13px, 4vw, 17px);
    letter-spacing: .12em;
  }

  .intro-space .arc-collage .collage-title .eyebrow {
    font-size: 8px;
    letter-spacing: .16em;
  }
}