#timeline {
  position: relative;
  overflow: hidden;
  isolation: isolate;
  background: #080808;
}

#timeline::before {
  content: "";
  position: absolute;
  inset: -4%;
  z-index: -2;
  background:
    linear-gradient(180deg, rgba(0, 0, 0, 0.42), rgba(0, 0, 0, 0.84)),
    url("../assets/images/bg-timeline-activities.png");
  background-position: center;
  background-repeat: no-repeat;
  background-size: cover;
  filter: blur(16px);
  transform: scale(1.08);
}

#timeline::after {
  content: "";
  position: absolute;
  inset: 0;
  z-index: -1;
  background:
    radial-gradient(circle at 20% 20%, rgba(212, 0, 31, 0.1), transparent 36%),
    radial-gradient(circle at 80% 75%, rgba(201, 162, 39, 0.08), transparent 42%),
    linear-gradient(180deg, rgba(8, 8, 8, 0.35), rgba(8, 8, 8, 0.78));
}

.timeline-circuit {
  position: relative;
  width: min(100%, 920px);
  margin: 0 auto;
  padding-block: var(--space-5);
}

.timeline-track {
  position: absolute;
  inset: 0 auto 0 50%;
  width: 12px;
  transform: translateX(-50%);
  border: 2px solid rgba(255, 255, 255, 0.12);
  border-radius: var(--track-radius);
  background: linear-gradient(
    90deg,
    rgba(255, 255, 255, 0.04),
    rgba(255, 255, 255, 0.1),
    rgba(255, 255, 255, 0.04)
  );
}

.timeline-track::before {
  content: "";
  position: absolute;
  inset: 0 auto 0 50%;
  width: 2px;
  transform: translateX(-50%);
  background: repeating-linear-gradient(
    to bottom,
    rgba(255, 255, 255, 0.55) 0 12px,
    transparent 12px 24px
  );
  opacity: 0.38;
}

.timeline-progress {
  position: absolute;
  top: 0;
  left: 50%;
  width: 6px;
  height: 0;
  transform: translateX(-50%);
  border-radius: var(--track-radius);
  background: linear-gradient(
    180deg,
    var(--color-ferrari-light),
    var(--color-ferrari),
    var(--color-gold)
  );
  box-shadow: 0 0 16px rgba(212, 0, 31, 0.65);
  transition: height 0.65s cubic-bezier(0.16, 1, 0.3, 1);
}

.timeline-list {
  position: relative;
  display: flex;
  flex-direction: column;
  gap: clamp(2.2rem, 5vw, 4.5rem);
}

.timeline-item {
  position: relative;
  display: grid;
  grid-template-columns: 1fr 90px 1fr;
  align-items: center;
  min-height: 150px;
  opacity: 0;
  transform: translateY(42px);
  transition:
    opacity 0.75s ease,
    transform 0.75s cubic-bezier(0.16, 1, 0.3, 1);
}

.timeline-item.visible {
  opacity: 1;
  transform: translateY(0);
}

.timeline-item:nth-child(odd) .timeline-card {
  grid-column: 1;
  justify-self: end;
  text-align: right;
}

.timeline-item:nth-child(even) .timeline-card {
  grid-column: 3;
  justify-self: start;
  text-align: left;
}

.timeline-node {
  position: relative;
  z-index: 3;
  grid-column: 2;
  justify-self: center;
  width: 28px;
  height: 28px;
  border: 4px solid var(--bg-primary);
  border-radius: 50%;
  background: var(--color-black-elevated);
  box-shadow: 0 0 0 1px rgba(255, 255, 255, 0.18);
}

.timeline-node::before {
  content: "";
  position: absolute;
  inset: 6px;
  border-radius: 50%;
  background: var(--text-muted);
}

.timeline-item.active .timeline-node {
  transform: scale(1.18);
  background: var(--color-ferrari);
  box-shadow: 0 0 26px rgba(212, 0, 31, 0.7);
}

.timeline-item.active .timeline-node::before {
  background: var(--color-white);
}

.timeline-card {
  position: relative;
  width: min(100%, 360px);
  padding: clamp(1.35rem, 3vw, 2rem);
  border: 1px solid rgba(255, 255, 255, 0.09);
  border-radius: var(--border-radius-lg);
  background: linear-gradient(
    145deg,
    rgba(255, 255, 255, 0.07),
    rgba(255, 255, 255, 0.018)
  );
  backdrop-filter: blur(var(--glass-blur));
  box-shadow:
    inset 0 1px 0 rgba(255, 255, 255, 0.06),
    0 22px 55px rgba(0, 0, 0, 0.32);
}

.timeline-time {
  display: block;
  margin-bottom: var(--space-2);
  color: var(--color-gold);
  font-size: 1.15rem;
  letter-spacing: 0.12em;
}

.timeline-title {
  margin-bottom: var(--space-2);
  font-size: clamp(1.6rem, 3vw, 2.25rem);
}

.timeline-lap {
  position: absolute;
  top: var(--space-3);
  font-family: var(--font-display);
  font-size: 0.58rem;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--text-muted);
}

.timeline-item:nth-child(odd) .timeline-lap {
  left: var(--space-4);
}

.timeline-item:nth-child(even) .timeline-lap {
  right: var(--space-4);
}

.timeline-car {
  position: absolute;
  z-index: 5;
  top: 0;
  left: 50%;
  width: 58px;
  transform: translate(-50%, -50%) rotate(90deg);
  transition: top 0.65s cubic-bezier(0.16, 1, 0.3, 1);
  filter: drop-shadow(0 0 10px rgba(212, 0, 31, 0.7));
}

.timeline-start,
.timeline-finish {
  position: absolute;
  left: calc(50% + 24px);
  font-family: var(--font-display);
  font-size: 0.62rem;
  letter-spacing: 0.24em;
  text-transform: uppercase;
  color: var(--text-muted);
}

.timeline-start {
  top: -6px;
}

.timeline-finish {
  bottom: -6px;
}

.timeline-checkered {
  width: 56px;
  height: 24px;
  margin: var(--space-7) auto 0;
  background: conic-gradient(#fff 25%, #111 0 50%, #fff 0 75%, #111 0);
  background-size: 12px 12px;
  opacity: 0.65;
  transform: skewY(-5deg);
}

@media (max-width: 768px) {
  #timeline::before { filter: blur(10px); }
}