/* ============================================
   ECHOES OF WWII — Timeline Page Styles
   ============================================ */

.timeline-wrapper {
  position: relative;
  padding: 2rem 0 6rem;
}

/* The vertical red line */
.timeline-line {
  position: absolute;
  left: 50%;
  top: 0;
  bottom: 0;
  width: 2px;
  background: linear-gradient(
    to bottom,
    transparent,
    var(--accent) 5%,
    var(--accent) 95%,
    transparent
  );
  transform: translateX(-50%);
}

/* Animated glow that travels down the line */
.timeline-line::after {
  content: '';
  position: absolute;
  left: -3px;
  top: 0;
  width: 8px;
  height: 80px;
  background: linear-gradient(
    to bottom,
    transparent,
    var(--accent-light),
    transparent
  );
  border-radius: 4px;
  animation: lineGlow 4s ease-in-out infinite;
}

@keyframes lineGlow {
  0% { top: 0%; opacity: 0; }
  10% { opacity: 1; }
  90% { opacity: 1; }
  100% { top: 100%; opacity: 0; }
}

/* Each timeline event */
.timeline-event {
  position: relative;
  display: flex;
  align-items: flex-start;
  margin-bottom: 1rem;
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

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

/* Alternate left/right — classes assigned by JS */
.timeline-event.timeline-left {
  flex-direction: row-reverse;
  text-align: right;
}

.timeline-event.timeline-left .timeline-content {
  margin-right: calc(50% + 30px);
  margin-left: 0;
  align-items: flex-end;
}

.timeline-event.timeline-right .timeline-content {
  margin-left: calc(50% + 30px);
  margin-right: 0;
  align-items: flex-start;
}

/* The dot on the line */
.timeline-dot {
  position: absolute;
  left: 50%;
  top: 1.5rem;
  width: 16px;
  height: 16px;
  background: var(--bg-primary);
  border: 2px solid var(--accent);
  border-radius: 50%;
  transform: translateX(-50%);
  z-index: 5;
  transition: var(--transition);
  cursor: pointer;
}

.timeline-dot::before {
  content: '';
  position: absolute;
  inset: 3px;
  background: var(--accent);
  border-radius: 50%;
  opacity: 0;
  transition: var(--transition);
}

.timeline-event:hover .timeline-dot {
  border-color: var(--accent-light);
  transform: translateX(-50%) scale(1.3);
  box-shadow: 0 0 20px var(--accent-glow);
}

.timeline-event:hover .timeline-dot::before {
  opacity: 1;
}

/* Year marker */
.timeline-year {
  position: absolute;
  left: 50%;
  transform: translateX(-50%);
  font-family: var(--font-heading);
  font-size: 3.5rem;
  font-weight: 700;
  color: rgba(192, 57, 43, 0.08);
  z-index: 1;
  pointer-events: none;
  white-space: nowrap;
  margin-bottom: 2rem;
  padding-top: 1rem;
}

.timeline-year-group {
  position: relative;
  margin-top: 3rem;
  margin-bottom: 0;
  display: flex;
  justify-content: center;
}

.timeline-year-label {
  background: transparent;
  padding: 0.5rem 0;
  font-family: var(--font-heading);
  font-size: 2rem;
  font-weight: 700;
  color: var(--accent-light);
  border: none;
  z-index: 6;
  letter-spacing: 2px;
  position: relative;
}

/* No extra space — year label sits on top of next card */
.timeline-year-group + .timeline-event {
  margin-top: 0;
}

/* Content card */
.timeline-content {
  display: flex;
  flex-direction: column;
  width: 100%;
  max-width: 460px;
}

.timeline-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  transition: var(--transition);
  position: relative;
  overflow: hidden;
  cursor: pointer;
  text-decoration: none;
  display: block;
}

.timeline-card-img {
  width: 100%;
  height: 140px;
  object-fit: cover;
  filter: grayscale(60%) contrast(1.1) brightness(0.8);
  transition: var(--transition-slow);
  display: block;
}

.timeline-card:hover .timeline-card-img {
  filter: grayscale(30%) contrast(1.15) brightness(0.9);
  transform: scale(1.03);
}

.timeline-card-img-wrapper {
  overflow: hidden;
  position: relative;
}

.timeline-card-img-wrapper::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  height: 50%;
  background: linear-gradient(to top, var(--bg-card), transparent);
  pointer-events: none;
}

.timeline-card-body {
  padding: 1.25rem 1.75rem 1.75rem;
}

.timeline-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 3px;
  height: 0;
  background: var(--accent-light);
  transition: height var(--transition-slow);
}

.timeline-event.timeline-left .timeline-card::before {
  left: auto;
  right: 0;
}

.timeline-card:hover {
  border-color: rgba(192, 57, 43, 0.3);
  background: var(--bg-card-hover);
  transform: translateY(-2px);
  box-shadow: 0 10px 40px rgba(0, 0, 0, 0.3);
}

.timeline-card:hover::before {
  height: 100%;
}

.timeline-card-date {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 2px;
  color: var(--accent-light);
  margin-bottom: 0.75rem;
  text-transform: uppercase;
}

.timeline-card h3 {
  font-size: 1.15rem;
  margin-bottom: 0.5rem;
  transition: var(--transition);
}

.timeline-card:hover h3 {
  color: var(--accent-light);
}

.timeline-card p {
  font-size: 0.88rem;
  line-height: 1.6;
  color: var(--text-secondary);
  margin-bottom: 1rem;
}

.timeline-card-footer {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 1px;
  text-transform: uppercase;
  color: var(--gold);
  transition: var(--transition);
}

.timeline-card:hover .timeline-card-footer {
  gap: 0.75rem;
}

.timeline-card-footer svg {
  width: 12px;
  height: 12px;
}

/* Filter Bar */
.timeline-filters {
  display: flex;
  justify-content: center;
  gap: 0.75rem;
  margin-bottom: 4rem;
  flex-wrap: wrap;
}

.filter-btn {
  padding: 0.5rem 1.25rem;
  font-family: var(--font-body);
  font-size: 0.8rem;
  font-weight: 500;
  letter-spacing: 1px;
  text-transform: uppercase;
  background: transparent;
  color: var(--text-secondary);
  border: 1px solid var(--border);
  cursor: pointer;
  transition: var(--transition);
}

.filter-btn:hover {
  border-color: var(--text-secondary);
  color: var(--text-primary);
}

.filter-btn.active {
  background: var(--accent);
  border-color: var(--accent);
  color: var(--text-primary);
}

/* Responsive timeline */
@media (max-width: 900px) {
  .timeline-line {
    left: 24px;
  }

  .timeline-event,
  .timeline-event.timeline-left {
    flex-direction: row;
    text-align: left;
  }

  .timeline-event.timeline-left .timeline-content,
  .timeline-event.timeline-right .timeline-content {
    margin-left: 60px;
    margin-right: 0;
    align-items: flex-start;
    max-width: 100%;
  }

  .timeline-dot {
    left: 24px;
  }

  .timeline-year-group {
    justify-content: flex-start;
    padding-left: 60px;
    margin-bottom: 0;
  }

  .timeline-event.timeline-left .timeline-card::before {
    left: 0;
    right: auto;
  }
}