:root {
  --bg-1: #070612;
  --bg-2: #0f1630;
  --ink: #eff6ff;
  --ink-dim: #c5d3ea;
  --neon-cyan: #43ffd1;
  --neon-magenta: #ff3ea5;
  --neon-blue: #2ca4ff;
  --card-bg: rgba(8, 12, 28, 0.9);
  --line: rgba(188, 212, 255, 0.42);
  --chip-bg: rgba(14, 24, 51, 0.75);
  --chip-border: rgba(93, 132, 255, 0.55);
  --elev: 0 14px 38px rgba(0, 0, 0, 0.45);
  --radius-lg: 20px;
  --radius-md: 14px;
}

* {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  min-height: 100%;
}

body {
  font-family: "Chakra Petch", sans-serif;
  color: var(--ink);
  background:
    radial-gradient(circle at 10% 10%, rgba(255, 62, 165, 0.16), transparent 28%),
    radial-gradient(circle at 85% 15%, rgba(44, 164, 255, 0.2), transparent 31%),
    radial-gradient(circle at 50% 105%, rgba(67, 255, 209, 0.17), transparent 42%),
    linear-gradient(160deg, var(--bg-1), var(--bg-2));
  overflow-x: hidden;
}

.bg-grid {
  position: fixed;
  inset: 0;
  pointer-events: none;
  background-image:
    linear-gradient(to right, rgba(89, 133, 255, 0.08) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(89, 133, 255, 0.06) 1px, transparent 1px);
  background-size: 26px 26px;
  mask-image: radial-gradient(circle at 50% 40%, black 22%, transparent 88%);
  opacity: 0.34;
}

.app {
  position: relative;
  width: min(1300px, 100% - 2rem);
  margin: 0 auto;
  padding: 2.2rem 0 3.2rem;
}

.hero {
  margin-bottom: 1.4rem;
}

.hero-kicker {
  display: inline-block;
  margin: 0;
  padding: 0.25rem 0.7rem;
  font-family: "VT323", monospace;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  font-size: clamp(1.2rem, 2.5vw, 1.5rem);
  border: 1px solid rgba(67, 255, 209, 0.5);
  border-radius: 999px;
  color: var(--neon-cyan);
  background: rgba(0, 10, 30, 0.45);
}

h1 {
  margin: 0.6rem 0 0.25rem;
  font-family: "Bungee", cursive;
  font-size: clamp(1.5rem, 5vw, 3.15rem);
  line-height: 1.1;
  letter-spacing: 0.035em;
  text-wrap: balance;
  text-shadow: 0 0 18px rgba(44, 164, 255, 0.45);
}

.hero-copy {
  margin: 0;
  max-width: 60ch;
  color: var(--ink-dim);
  font-size: clamp(1rem, 2.1vw, 1.18rem);
}

.notice {
  position: fixed;
  top: 1rem;
  right: 1rem;
  z-index: 30;
  width: min(480px, calc(100% - 2rem));
  padding: 0.8rem 1rem;
  border-radius: 12px;
  font-size: 0.95rem;
  color: #ffe9c8;
  border: 1px solid rgba(255, 193, 95, 0.55);
  background: rgba(56, 28, 7, 0.88);
  backdrop-filter: blur(6px);
  box-shadow: var(--elev);
}

.timeline-section {
  position: relative;
  border-radius: var(--radius-lg);
  border: 1px solid rgba(81, 116, 237, 0.45);
  background: linear-gradient(160deg, rgba(7, 18, 44, 0.82), rgba(7, 12, 26, 0.64));
  box-shadow: var(--elev);
  padding: 0.7rem 0.7rem 1.15rem;
}

.timeline-hint {
  margin: 0.2rem 0.45rem 0.35rem;
  font-family: "VT323", monospace;
  font-size: 1.32rem;
  letter-spacing: 0.05em;
  color: var(--neon-cyan);
  opacity: 0.93;
}

.timeline-viewport {
  width: 100%;
  overflow: auto hidden;
  cursor: grab;
  border-radius: var(--radius-md);
  scrollbar-width: thin;
  scrollbar-color: rgba(114, 182, 255, 0.85) rgba(4, 9, 25, 0.6);
}

.timeline-viewport:focus-visible {
  outline: 2px solid var(--neon-cyan);
  outline-offset: 2px;
}

.timeline-viewport.is-dragging {
  cursor: grabbing;
}

.timeline-viewport::-webkit-scrollbar {
  height: 10px;
}

.timeline-viewport::-webkit-scrollbar-track {
  background: rgba(3, 9, 26, 0.6);
}

.timeline-viewport::-webkit-scrollbar-thumb {
  border-radius: 999px;
  background: linear-gradient(90deg, var(--neon-blue), var(--neon-cyan));
}

.timeline-track {
  position: relative;
  display: flex;
  gap: clamp(0.8rem, 1.6vw, 1.5rem);
  align-items: stretch;
  min-width: 100%;
  width: max-content;
  padding: 1.2rem 1rem 2rem;
  min-height: clamp(240px, 40vh, 330px);
}

.timeline-track::before {
  content: "";
  position: absolute;
  left: 0.8rem;
  right: 0.8rem;
  top: 52%;
  height: 4px;
  border-radius: 999px;
  background:
    linear-gradient(
      90deg,
      rgba(255, 62, 165, 0.25),
      rgba(44, 164, 255, 0.72),
      rgba(67, 255, 209, 0.48)
    );
  box-shadow: 0 0 22px rgba(44, 164, 255, 0.35);
}

.timeline-node {
  position: relative;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: flex-start;
  width: clamp(140px, 18vw, 210px);
  padding: 0;
  border: 0;
  background: transparent;
  color: inherit;
  text-align: left;
  font: inherit;
  transform: translateY(var(--offset-y, 0));
  animation: node-entry 0.55s ease both;
  animation-delay: calc(var(--idx, 0) * 36ms);
  cursor: pointer;
}

.timeline-node::before {
  content: "";
  position: absolute;
  left: 0.5rem;
  top: 51%;
  width: 18px;
  aspect-ratio: 1;
  border-radius: 50%;
  border: 2px solid rgba(235, 248, 255, 0.94);
  background: radial-gradient(circle at 35% 30%, white, var(--neon-blue));
  box-shadow:
    0 0 0 7px rgba(44, 164, 255, 0.16),
    0 0 20px rgba(44, 164, 255, 0.68);
  transform: translateY(-50%);
  transition: transform 0.22s ease;
}

.timeline-node:nth-child(odd) {
  --offset-y: -25%;
}

.timeline-node:nth-child(even) {
  --offset-y: 24%;
}

.node-chip {
  width: 100%;
  min-height: 86px;
  padding: 0.82rem 0.72rem;
  border: 1px solid var(--chip-border);
  border-radius: 13px;
  background: linear-gradient(145deg, rgba(17, 29, 62, 0.85), rgba(9, 16, 36, 0.75));
  box-shadow: inset 0 0 0 1px rgba(106, 186, 255, 0.15);
  backdrop-filter: blur(5px);
  transition:
    transform 0.2s ease,
    box-shadow 0.2s ease,
    border-color 0.2s ease;
}

.node-title {
  display: block;
  font-size: clamp(0.9rem, 1.7vw, 1.03rem);
  font-weight: 600;
  line-height: 1.25;
}

.node-date {
  display: block;
  margin-top: 0.42rem;
  font-family: "VT323", monospace;
  font-size: 1.34rem;
  color: var(--neon-cyan);
  letter-spacing: 0.03em;
}

.timeline-node:hover .node-chip,
.timeline-node:focus-visible .node-chip {
  transform: translateY(-3px) scale(1.01);
  border-color: rgba(67, 255, 209, 0.8);
  box-shadow:
    0 8px 20px rgba(0, 0, 0, 0.32),
    0 0 18px rgba(67, 255, 209, 0.24),
    inset 0 0 0 1px rgba(106, 186, 255, 0.25);
}

.timeline-node:hover::before,
.timeline-node:focus-visible::before {
  transform: translateY(-50%) scale(1.12);
}

.timeline-node:focus-visible {
  outline: none;
}

.card-overlay {
  position: fixed;
  inset: 0;
  z-index: 39;
  background: rgba(2, 6, 18, 0.62);
  backdrop-filter: blur(4px);
}

.detail-card {
  --card-x: 0px;
  --card-y: 0px;
  --card-scale: 1;
  --card-opacity: 1;
  position: fixed;
  top: 50%;
  left: 50%;
  z-index: 40;
  width: min(930px, 94vw);
  max-height: 88dvh;
  overflow: auto;
  border: 1px solid rgba(80, 120, 255, 0.6);
  border-radius: 18px;
  background: var(--card-bg);
  box-shadow:
    0 30px 55px rgba(0, 0, 0, 0.5),
    0 0 32px rgba(44, 164, 255, 0.17);
  transform:
    translate(-50%, -50%)
    translate(var(--card-x), var(--card-y))
    scale(var(--card-scale));
  opacity: var(--card-opacity);
  transform-origin: center;
  transition:
    transform 420ms cubic-bezier(0.18, 0.82, 0.2, 1),
    opacity 260ms ease;
}

.detail-card::-webkit-scrollbar {
  width: 11px;
}

.detail-card::-webkit-scrollbar-thumb {
  border-radius: 999px;
  background: linear-gradient(180deg, rgba(67, 255, 209, 0.82), rgba(44, 164, 255, 0.78));
}

.close-card {
  position: sticky;
  top: 0.65rem;
  float: right;
  margin: 0.65rem 0.65rem 0 0;
  padding: 0.35rem 0.75rem;
  border: 1px solid rgba(111, 229, 249, 0.62);
  border-radius: 999px;
  background: rgba(8, 19, 40, 0.8);
  color: var(--ink);
  font-family: "VT323", monospace;
  font-size: 1.18rem;
  letter-spacing: 0.04em;
  cursor: pointer;
}

.card-header {
  display: grid;
  grid-template-columns: minmax(160px, 220px) 1fr;
  gap: clamp(1rem, 2vw, 1.3rem);
  padding: 1rem 1.25rem 0.6rem;
}

.art-frame {
  margin: 0;
  position: relative;
  border-radius: 12px;
  border: 1px solid rgba(86, 131, 255, 0.55);
  overflow: hidden;
  background: rgba(7, 14, 32, 0.8);
  min-height: 240px;
}

.card-image {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.image-placeholder {
  position: absolute;
  inset: 0;
  display: grid;
  place-items: center;
  font-family: "Bungee", cursive;
  letter-spacing: 0.07em;
  color: rgba(177, 217, 255, 0.8);
  background:
    linear-gradient(130deg, rgba(20, 36, 72, 0.95), rgba(22, 14, 54, 0.86)),
    repeating-linear-gradient(
      -45deg,
      rgba(67, 255, 209, 0.09),
      rgba(67, 255, 209, 0.09) 8px,
      transparent 8px,
      transparent 16px
    );
  transition: opacity 180ms ease;
}

.image-placeholder.is-hidden {
  opacity: 0;
  visibility: hidden;
  pointer-events: none;
}

.card-year {
  margin: 0.3rem 0 0.25rem;
  font-family: "VT323", monospace;
  font-size: 1.45rem;
  color: var(--neon-cyan);
}

.card-title {
  margin: 0;
  font-size: clamp(1.4rem, 3.3vw, 2.2rem);
  line-height: 1.1;
  text-wrap: balance;
}

.card-formats {
  margin: 0.65rem 0 0;
  color: var(--ink-dim);
}

.card-body {
  padding: 0.35rem 1.25rem 1.2rem;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 0.9rem 1rem;
}

.card-body section {
  border: 1px solid rgba(86, 131, 255, 0.33);
  border-radius: 12px;
  padding: 0.7rem 0.75rem;
  background: rgba(9, 18, 42, 0.5);
}

.card-body h3 {
  margin: 0 0 0.45rem;
  font-family: "VT323", monospace;
  font-size: 1.35rem;
  color: var(--neon-cyan);
  letter-spacing: 0.04em;
}

.card-body p {
  margin: 0;
  line-height: 1.45;
  color: var(--ink-dim);
}

.meta-list {
  display: grid;
  grid-template-columns: minmax(90px, 0.7fr) 1fr;
  gap: 0.35rem 0.55rem;
  margin: 0;
}

.meta-list dt {
  color: rgba(146, 188, 244, 0.95);
}

.meta-list dd {
  margin: 0;
  color: var(--ink);
}

@keyframes node-entry {
  from {
    opacity: 0;
    transform: translateY(calc(var(--offset-y, 0) + 14px));
  }
  to {
    opacity: 1;
    transform: translateY(var(--offset-y, 0));
  }
}

@media (max-width: 920px) {
  .timeline-track {
    min-height: 300px;
  }

  .timeline-node {
    width: 170px;
  }

  .card-header {
    grid-template-columns: minmax(140px, 180px) 1fr;
  }

  .card-body {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 680px) {
  .app {
    width: min(1200px, 100% - 1rem);
    padding-top: 1.2rem;
  }

  .timeline-section {
    padding: 0.5rem 0.45rem 0.7rem;
  }

  .timeline-track {
    gap: 0.7rem;
    min-height: 260px;
    padding-bottom: 1.2rem;
  }

  .timeline-node {
    width: 148px;
  }

  .detail-card {
    width: 95vw;
    max-height: 92dvh;
  }

  .card-header {
    grid-template-columns: 1fr;
  }

  .art-frame {
    min-height: 210px;
    max-height: 340px;
  }
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation: none !important;
    transition: none !important;
    scroll-behavior: auto !important;
  }
}