.timeline {
  display: grid;
  grid-template-columns: repeat(5, minmax(0, 1fr));
  width: min(100%, var(--container-width));
  max-width: var(--container-width);
  margin: 0 auto;
  gap: var(--space-1);
  padding: 0;
}

.htrack-panel {
  position: relative;
  min-width: 0;
  perspective: 1200px;
  cursor: pointer;
}

.htrack-panel-inner {
  position: relative;
  width: 100%;
  aspect-ratio: 4/5 !important;
  aspect-ratio: 4 / 5 !important;
  transform-style: preserve-3d;
  transition: transform 420ms ease;
}

.htrack-panel.is-flipped .htrack-panel-inner {
  transform: rotateY(180deg);
}

.htrack-face {
  position: absolute;
  inset: 0;
  display: grid;
  backface-visibility: hidden;
  -webkit-backface-visibility: hidden;
  border-radius: 5px;
  overflow: hidden;
  box-shadow: var(--shadow-soft);
}

.htrack-face-front {
  align-content: end;
  background: #1c1712;
}

.htrack-face-back {
  transform: rotateY(180deg);
  padding: var(--space-4);
  align-content: center;
  background:
    linear-gradient(180deg, rgba(33, 20, 9, 0.94) 0%, rgba(20, 11, 5, 0.98) 100%);
  border: 1px solid rgba(213, 169, 76, 0.18);
}

.hp-visual {
  position: absolute;
  inset: 0;
  margin: 0;
  background:
    linear-gradient(180deg, rgba(14, 10, 7, 0.08) 0%, rgba(14, 10, 7, 0.58) 100%),
    var(--hp-image) center / cover no-repeat;
}

.hp-visual img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: 0;
}

.htrack-face-front .htrack-panel-desc {
  position: relative;
  z-index: 1;
  padding: var(--space-4);
}

.htrack-face-back .htrack-panel-desc {
  display: grid;
  gap: var(--space-3);
}

.hp-year {
  font-size: 18px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: #f5d08a;
}

.hp-title,
.ch2-question {
  margin: 0;
  font-family: var(--font-family-display);
  font-size: 18px;
  text-align: center;
  line-height: 1.2;
  font-weight: 700;
  color: #fff6e9;
}

.hp-title {
  text-align: left;
}

.hp-text {
  margin: 0;
  font-size: 16px;
  line-height: 1.55;
  color: rgba(255, 244, 230, 0.92);
}

@media (max-width: 1100px) {
  .timeline {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (max-width: 720px) {
  .timeline {
    grid-template-columns: 1fr;
    padding: var(--space-6) var(--space-3);
  }

  
}