:root {
  --void: #f4f8ff;
  --void-deep: #dce8f5;
  --cyan: #5ad4ff;
  --cyan-dim: rgba(90, 212, 255, 0.35);
  --line: rgba(120, 190, 230, 0.45);
  --text: #1a2838;
  --text-soft: rgba(26, 40, 56, 0.65);
  --glass: rgba(255, 255, 255, 0.22);
  --glow: 0 0 24px rgba(90, 212, 255, 0.35), 0 0 60px rgba(180, 220, 255, 0.2);
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

html,
body {
  height: 100%;
  margin: 0;
  overflow: hidden;
  font-family: "Noto Sans SC", "JetBrains Mono", system-ui, sans-serif;
  color: var(--text);
  background: var(--void);
}

body {
  position: relative;
}

.void-bg {
  position: fixed;
  inset: 0;
  z-index: 0;
  pointer-events: none;
  background: radial-gradient(ellipse 120% 80% at 50% 20%, #ffffff 0%, var(--void) 45%, var(--void-deep) 100%);
}

.void-grid {
  position: absolute;
  inset: -50%;
  opacity: 0.28;
  background-image:
    linear-gradient(90deg, var(--line) 1px, transparent 1px),
    linear-gradient(var(--line) 1px, transparent 1px);
  background-size: 56px 56px;
  transform: perspective(800px) rotateX(68deg) translateY(-12%);
  animation: grid-drift 48s linear infinite;
}

@keyframes grid-drift {
  0% {
    transform: perspective(800px) rotateX(68deg) translateY(-12%) translateZ(0);
  }
  100% {
    transform: perspective(800px) rotateX(68deg) translateY(-12%) translateZ(0) translate(56px, 56px);
  }
}

.void-glow {
  position: absolute;
  inset: 0;
  background: radial-gradient(circle at 50% 40%, rgba(255, 255, 255, 0.85) 0%, transparent 55%);
  mix-blend-mode: screen;
}

.void-scan {
  position: absolute;
  inset: 0;
  background: linear-gradient(
    transparent 0%,
    rgba(200, 235, 255, 0.06) 48%,
    rgba(200, 235, 255, 0.12) 50%,
    rgba(200, 235, 255, 0.06) 52%,
    transparent 100%
  );
  background-size: 100% 220%;
  animation: scan 9s ease-in-out infinite;
  opacity: 0.5;
}

@keyframes scan {
  0%,
  100% {
    background-position: 0 -80%;
  }
  50% {
    background-position: 0 80%;
  }
}

.cursor-glow {
  position: fixed;
  width: 420px;
  height: 420px;
  margin: -210px 0 0 -210px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(150, 220, 255, 0.14) 0%, transparent 70%);
  pointer-events: none;
  z-index: 1;
  transition: opacity 0.4s ease;
  opacity: 0.9;
}

.hud-top {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 5;
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  padding: 1.25rem 1.75rem;
  font-family: "JetBrains Mono", monospace;
  font-size: 0.72rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--text-soft);
}

.hud-brand {
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
}

.hud-mark {
  color: var(--cyan);
  font-size: 1rem;
  text-shadow: 0 0 12px var(--cyan-dim);
}

.hud-title {
  font-size: 1.05rem;
  font-weight: 500;
  color: var(--text);
  letter-spacing: 0.25em;
}

.hud-sub {
  font-size: 0.65rem;
  opacity: 0.75;
}

.hud-meta {
  text-align: right;
}

.hud-meta .sep {
  margin: 0 0.5rem;
  opacity: 0.4;
}

.stage {
  position: relative;
  z-index: 2;
  height: 100%;
  display: flex;
  flex-direction: column;
  justify-content: center;
  padding: 5rem 0 4rem;
}

.intro-panel {
  text-align: center;
  padding: 0 1.5rem 1.5rem;
  max-width: 36rem;
  margin: 0 auto;
}

.intro-line {
  margin: 0 0 0.5rem;
  font-size: 0.95rem;
  font-weight: 400;
  color: var(--text-soft);
}

.intro-hint {
  margin: 0;
  font-family: "JetBrains Mono", monospace;
  font-size: 0.7rem;
  letter-spacing: 0.08em;
  color: var(--cyan);
  opacity: 0.85;
}

.perspective-wrap {
  position: relative;
  flex: 1;
  display: flex;
  align-items: center;
  perspective: 1400px;
  perspective-origin: 50% 45%;
  padding: 0 0 2rem;
}

.rail-connector {
  position: absolute;
  left: 8%;
  right: 8%;
  top: 50%;
  height: 1px;
  background: linear-gradient(
    90deg,
    transparent,
    rgba(90, 212, 255, 0.25) 15%,
    rgba(90, 212, 255, 0.5) 50%,
    rgba(90, 212, 255, 0.25) 85%,
    transparent
  );
  transform: translateY(-50%) rotateX(12deg);
  box-shadow: 0 0 20px rgba(90, 212, 255, 0.2);
  pointer-events: none;
}

.list-scroller {
  display: flex;
  gap: 1.35rem;
  padding: 2rem calc(50vw - 110px) 3rem;
  overflow-x: auto;
  overflow-y: visible;
  scroll-snap-type: x mandatory;
  scroll-behavior: smooth;
  -webkit-overflow-scrolling: touch;
  scrollbar-width: thin;
  scrollbar-color: var(--cyan-dim) transparent;
  transform: rotateX(8deg) translateZ(0);
  transform-style: preserve-3d;
  mask-image: linear-gradient(90deg, transparent, #000 6%, #000 94%, transparent);
}

.list-scroller::-webkit-scrollbar {
  height: 4px;
}

.list-scroller::-webkit-scrollbar-thumb {
  background: var(--cyan-dim);
  border-radius: 4px;
}

.card {
  position: relative;
  flex: 0 0 220px;
  width: 220px;
  height: 220px;
  scroll-snap-align: center;
  border: 1px solid rgba(90, 212, 255, 0.55);
  border-radius: 6px;
  background: var(--glass);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  box-shadow: var(--glow), inset 0 0 0 1px rgba(255, 255, 255, 0.35);
  cursor: pointer;
  transform-style: preserve-3d;
  transition:
    transform 0.45s cubic-bezier(0.22, 1, 0.36, 1),
    box-shadow 0.35s ease,
    border-color 0.35s ease,
    opacity 0.35s ease;
}

.card::before,
.card::after {
  content: "";
  position: absolute;
  width: 10px;
  height: 10px;
  border: 1px solid rgba(90, 212, 255, 0.7);
  pointer-events: none;
}

.card::before {
  top: -1px;
  left: -1px;
  border-right: none;
  border-bottom: none;
}

.card::after {
  bottom: -1px;
  right: -1px;
  border-left: none;
  border-top: none;
}

.card:hover,
.card:focus-visible {
  transform: translateY(-12px) translateZ(36px) scale(1.03);
  border-color: rgba(90, 212, 255, 0.95);
  box-shadow:
    0 0 32px rgba(90, 212, 255, 0.45),
    0 24px 48px rgba(100, 160, 210, 0.18),
    inset 0 0 0 1px rgba(255, 255, 255, 0.5);
  outline: none;
}

.card:focus-visible {
  outline: 2px solid var(--cyan);
  outline-offset: 4px;
}

.card-inner {
  position: absolute;
  inset: 10px;
  border-radius: 4px;
  overflow: hidden;
  background: rgba(255, 255, 255, 0.35);
}

.card-inner img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  filter: saturate(0.92) contrast(1.02);
  transition: transform 0.5s ease;
}

.card:hover .card-inner img {
  transform: scale(1.06);
}

.card-label {
  position: absolute;
  left: 10px;
  right: 10px;
  bottom: 8px;
  padding: 0.35rem 0.45rem;
  font-family: "JetBrains Mono", monospace;
  font-size: 0.62rem;
  letter-spacing: 0.06em;
  color: var(--text);
  background: linear-gradient(180deg, rgba(255, 255, 255, 0.75), rgba(244, 248, 255, 0.9));
  border: 1px solid rgba(90, 212, 255, 0.25);
  border-radius: 3px;
  line-height: 1.35;
  backdrop-filter: blur(6px);
}

.card-index {
  position: absolute;
  top: 8px;
  right: 10px;
  font-family: "JetBrains Mono", monospace;
  font-size: 0.58rem;
  color: var(--text-soft);
  opacity: 0.85;
}

.hud-bottom {
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  z-index: 5;
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 0.75rem 1.5rem;
  font-family: "JetBrains Mono", monospace;
  font-size: 0.62rem;
  letter-spacing: 0.14em;
  color: var(--text-soft);
  background: linear-gradient(180deg, transparent, rgba(255, 255, 255, 0.65));
}

.footer-quote {
  flex: 1;
  text-align: center;
  font-family: "Noto Sans SC", sans-serif;
  font-size: 0.78rem;
  letter-spacing: 0.06em;
  color: var(--text);
  opacity: 0.88;
}

.lightbox {
  position: fixed;
  inset: 0;
  z-index: 20;
  display: grid;
  place-items: center;
  padding: 2rem;
  background: rgba(244, 248, 255, 0.72);
  backdrop-filter: blur(16px) saturate(1.1);
  -webkit-backdrop-filter: blur(16px) saturate(1.1);
  animation: lb-fade 0.45s ease forwards;
}

.lightbox[hidden] {
  display: none;
}

@keyframes lb-fade {
  from {
    opacity: 0;
  }
  to {
    opacity: 1;
  }
}

.lightbox-close {
  position: absolute;
  top: 1.25rem;
  right: 1.5rem;
  width: 44px;
  height: 44px;
  border: 1px solid rgba(90, 212, 255, 0.5);
  border-radius: 4px;
  background: rgba(255, 255, 255, 0.5);
  color: var(--text);
  font-size: 1.5rem;
  line-height: 1;
  cursor: pointer;
  transition: background 0.2s, box-shadow 0.2s;
}

.lightbox-close:hover {
  background: rgba(255, 255, 255, 0.85);
  box-shadow: 0 0 20px rgba(90, 212, 255, 0.35);
}

.lightbox-frame {
  max-width: min(92vw, 960px);
  max-height: min(86vh, 900px);
  display: flex;
  flex-direction: column;
  gap: 1rem;
  padding: 1rem;
  border: 1px solid rgba(90, 212, 255, 0.55);
  border-radius: 8px;
  background: rgba(255, 255, 255, 0.35);
  box-shadow: var(--glow), 0 32px 80px rgba(80, 130, 180, 0.15);
  animation: lb-pop 0.55s cubic-bezier(0.22, 1, 0.36, 1) forwards;
}

@keyframes lb-pop {
  from {
    opacity: 0;
    transform: scale(0.88) translateY(20px);
  }
  to {
    opacity: 1;
    transform: scale(1) translateY(0);
  }
}

.lightbox-img {
  display: block;
  max-width: 100%;
  max-height: min(62vh, 640px);
  width: auto;
  height: auto;
  margin: 0 auto;
  object-fit: contain;
  border-radius: 4px;
  box-shadow: 0 8px 40px rgba(60, 100, 140, 0.12);
}

.lightbox-caption h2 {
  margin: 0 0 0.35rem;
  font-size: 1.1rem;
  font-weight: 500;
}

.lightbox-caption p {
  margin: 0;
  font-size: 0.88rem;
  color: var(--text-soft);
  line-height: 1.55;
}

@media (max-width: 640px) {
  .hud-top {
    flex-direction: column;
    gap: 0.75rem;
  }

  .hud-meta {
    text-align: left;
  }

  .list-scroller {
    gap: 1rem;
    padding: 1.5rem calc(50vw - 100px) 2.5rem;
    transform: rotateX(4deg);
  }

  .card {
    flex: 0 0 200px;
    width: 200px;
    height: 200px;
  }

  .hud-bottom {
    flex-wrap: wrap;
    gap: 0.35rem;
    justify-content: center;
  }

  .footer-quote {
    order: 3;
    flex-basis: 100%;
  }
}

@media (prefers-reduced-motion: reduce) {
  .void-grid,
  .void-scan {
    animation: none;
  }

  .list-scroller {
    scroll-behavior: auto;
  }

  .card {
    transition: none;
  }
}