* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}
 
/* 整体布局 */
.about_container {
  display: flex;
  margin-top: 20px;
  min-height: 100vh;
  background: #f5f7fa;
  font-family: "Microsoft YaHei", sans-serif;
}
 
/* 左侧发展历程 */
.timeline-section {
  flex: 1;
  padding: 40px 60px;
  background: linear-gradient(135deg, #2c3e50 0%, #3498db 100%);
  color: white;
}
 
.history-list {
  position: relative;
  padding-left: 30px;
  list-style: none;
}
 
/* 时间轴竖线 */
.history-list::before {
  content: '';
  position: absolute;
  left: 6px;
  top: 15px;
  height: calc(100% - 30px);
  width: 2px;
  background: rgba(255,255,255,0.3);
}
 
.history-item {
  position: relative;
  margin-bottom: 5px;
  padding: 5px 10px;
  background: rgba(255,255,255,0.1);
  border-radius: 8px;
  transition: transform 0.3s;
}
 
.history-item:hover {
  transform: translateX(10px);
}
 
.history-year {
  position: absolute;
  left: -85px;
  top: 50%;
  transform: translateY(-50%);
  padding: 8px 15px;
  background: #e74c3c;
  border-radius: 20px;
  font-size: 16px;
  box-shadow: 0 2px 8px rgba(0,0,0,0.2);
}
 
.history-desc {
  line-height: 1.8;
  font-size: 16px;
  color: #ecf0f1;
}
 
/* 右侧九宫格 */
.gallery-section {
  flex: 1;
  padding: 40px;
  background: #fff;
}
 
.gallery-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 15px;
  max-width: 600px;
  margin: 0 auto;
}
 
.gallery-item {
  aspect-ratio: 1;
  background: #eee;
  border-radius: 12px;
  overflow: hidden;
  position: relative;
  transition: transform 0.3s, box-shadow 0.3s;
}
 
.gallery-item:hover {
  transform: translateY(-5px);
  box-shadow: 0 8px 20px rgba(0,0,0,0.15);
}
 
.gallery-item img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}
 
/* 响应式设计 */
@media (max-width: 768px) {
  .container {
    flex-direction: column;
  }
  .timeline-section {
    padding: 30px;
  }
  .gallery-section {
    padding: 30px 15px;
  }
}