/* ============================================
   TIMELINE — Scrollytelling pottery lifecycle
   ============================================ */

.section--timeline {
  padding: var(--space-2xl) 0;
  position: relative;
  overflow: hidden;
}

.timeline-header {
  text-align: center;
  padding: 0 var(--container-padding);
  max-width: var(--container-max);
  margin: 0 auto var(--space-xl);
  position: relative;
  z-index: 2;
}

.timeline-heading {
  font-family: var(--font-display);
  font-size: clamp(48px, 8vw, 110px);
  font-weight: 700;
  line-height: 0.9;
  letter-spacing: -0.04em;
  color: var(--color-text);
  margin-top: var(--space-md);
  text-transform: uppercase;
}

/* Timeline container */
.timeline-container {
  position: relative;
  max-width: 900px;
  margin: 0 auto;
  padding: 0 var(--container-padding);
}

/* Vertical line */
.timeline-line {
  position: absolute;
  left: calc(var(--container-padding) + 11px);
  top: 0;
  width: 2px;
  height: 100%;
  background: var(--color-border);
}

.timeline-line::after {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 0%;
  background: var(--color-text);
  transition: none;
}

/* Stages */
.timeline-stages {
  position: relative;
  display: flex;
  flex-direction: column;
}

.timeline-stage {
  display: flex;
  align-items: flex-start;
  gap: var(--space-lg);
  padding: var(--space-xl) 0;
  position: relative;
  opacity: 0;
  transform: translateY(30px);
}

.timeline-stage.is-active {
  opacity: 1;
  transform: translateY(0);
}

/* Dot */
.stage-dot {
  width: 24px;
  height: 24px;
  border-radius: 50%;
  border: 2px solid var(--color-border);
  background: var(--color-bg);
  flex-shrink: 0;
  position: relative;
  z-index: 2;
  transition: border-color 0.6s var(--ease-out-expo),
              background 0.6s var(--ease-out-expo),
              box-shadow 0.6s var(--ease-out-expo);
}

.timeline-stage.is-active .stage-dot {
  border-color: var(--stage-color);
  background: var(--stage-color);
  animation: dotPulse 2s ease-out;
}

/* Content */
.stage-content {
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
  padding-top: 2px;
  flex: 1;
}

.stage-label {
  font-family: var(--font-mono);
  font-size: 14px;
  font-weight: 600;
  letter-spacing: 0.15em;
  color: var(--color-text);
  transition: color 0.6s var(--ease-out-expo);
}

.timeline-stage.is-active .stage-label {
  color: var(--stage-color);
}

.stage-desc {
  font-family: var(--font-body);
  font-size: 15px;
  line-height: 1.6;
  color: var(--color-text-secondary);
  max-width: 440px;
}

/* Progress overlay */
.timeline-container::before {
  content: '';
  position: absolute;
  inset: 0;
  pointer-events: none;
  z-index: 3;
  background: linear-gradient(
    to bottom,
    var(--color-bg) 0%,
    transparent 5%,
    transparent 95%,
    var(--color-bg) 100%
  );
}

/* Responsive */
@media (max-width: 768px) {
  .timeline-container {
    padding: 0 var(--container-padding);
  }

  .timeline-line {
    left: calc(var(--container-padding) + 11px);
  }

  .timeline-stage {
    gap: var(--space-md);
    padding: var(--space-lg) 0;
  }

  .stage-desc {
    font-size: 14px;
  }
}