/* timeline-item block 样式 */
.timeline-item {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  opacity: 0;
  display: flex;
  transition: opacity 0.5s ease;
}

.timeline-item.active {
  opacity: 1;
}

/* 图片容器样式 */
.timeline-item .timeline-images {
  flex: 1;
  position: relative;
  overflow: hidden;
}

.timeline-item .timeline-image {
  width: 100%;
  height: 100%;
}

.timeline-item .timeline-image img,
.timeline-item .timeline-image svg {
  width: 100%;
  height: 100%;
  object-fit: cover;
  /* 图片视差效果 */
  opacity: 0;
  transform: scale(1.05) translateX(-15px);
  transition: all 1.2s cubic-bezier(0.25, 0.46, 0.45, 0.94);
}

/* 激活状态：图片淡入到正确位置 */
.timeline-item.active .timeline-image img,
.timeline-item.active .timeline-image svg {
  opacity: 1;
  transform: scale(1) translateX(0);
}

/* 文本内容样式 */
.timeline-item .timeline-text {
  flex: 1;
  background: white;
  display: flex;
  flex-direction: column;
  justify-content: flex-end;
  min-height: 100%; /* 保证容器撑满，justify-content 对所有 block 生效 */
}

.timeline-item .timeline-text.align-start {
  justify-content: flex-start;
}

.timeline-item .timeline-text.align-center {
  justify-content: center;
}

.timeline-item .timeline-text.align-end {
  justify-content: flex-end;
}

/* 单条时间轴项目对齐覆写（优先级高于 section 级的 align-*） */
.timeline-item .timeline-text.align-item-start {
  justify-content: flex-start;
}

.timeline-item .timeline-text.align-item-center {
  justify-content: center;
}

.timeline-item .timeline-text.align-item-end {
  justify-content: flex-end;
}

.timeline-item .timeline-info {
  padding: 48px;
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 0.3s ease 0.3s, transform 0.3s ease 0.3s;
}

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

.timeline-item .timeline-title {
  font-size: 12px;
  opacity: 0;
  transform: translateY(10px);
  transition: all 0.3s ease 0.4s;
  font-weight: initial;
  letter-spacing: 2px;
  color: rgb(var(--color-foreground));
}

.timeline-item .timeline-subtitle {
  font-size: 28px;
  margin: 20px 0px;
  opacity: 0;
  transform: translateY(10px);
  font-weight: initial;
  transition: all 0.3s ease 0.3s;
  letter-spacing: 5px;
  color: rgb(var(--color-foreground));
}

.timeline-item .timeline-description {
  font-size: 14px;
  opacity: 0;
  transform: translateY(10px);
  transition: all 0.3s ease 0.4s;
  color: rgb(var(--color-foreground));
}

.timeline-item.active .timeline-title,
.timeline-item.active .timeline-subtitle,
.timeline-item.active .timeline-description {
  opacity: 1;
  transform: translateY(0);
}

/* 文本大小写控制 */
.timeline-item .timeline-title.text-uppercase {
  text-transform: uppercase;
}

.timeline-item .timeline-subtitle.text-uppercase {
  text-transform: uppercase;
}

/* 响应式设计 - 移动端 */
@media (max-width: 768px) {
  .timeline-item {
    flex-direction: column;
    min-height: auto;
  }
  
  .timeline-item .timeline-images {
    width: 100%;
    height: 596px;
    flex: none;
    background-color: rgba(0,0,0,0.2);
  }

  .timeline-item .timeline-images:before {
    content: "";
    background: #0006;
    border-radius: inherit;
    z-index: 1;
    pointer-events: none;
    position: absolute;
    top: 0;
    right: 0;
    bottom: 0;
    left: 0;
  }
  
  .timeline-item .timeline-text {
    position: absolute;
    top: 50%;
    left: 0;
    right: 0;
    transform: translateY(-50%);
    background-color: transparent;
    padding: 20px;
    margin: 0;
    text-align: center;
    z-index: 1;
  }
  
  .timeline-item .timeline-info {
    padding: 0px;
    background-color: transparent;
  }
  
  .timeline-item .timeline-title {
    font-size: 12px;
    margin-bottom: 15px;
    color: white;
    text-shadow: 1px 1px 3px rgba(0,0,0,0.5);
  }
  
  .timeline-item .timeline-subtitle {
    font-size: 20px;
    margin-bottom: 20px;
    color: white;
    text-shadow: 1px 1px 3px rgba(0,0,0,0.5);
  }

  .timeline-item .timeline-description {
    font-size: 14px;
    color: white;
    text-shadow: 1px 1px 3px rgba(0,0,0,0.5);
  }
  
  .desktop-only {
    display: none;
  }
}

@media (min-width: 769px) {
  .mobile-only {
    display: none;
  }
}