#about {
  position: relative;
  width: 100vw;
  min-height: 100vh;
  overflow: hidden;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 4rem 2rem;
  box-sizing: border-box;
}

/* 背景图层动画 */
#about .backdrop {
  position: absolute;
  inset: 0;
  background-size: cover;
  background-position: center;
  background-repeat: no-repeat;
  z-index: 0;
  filter: brightness(0.6);
  opacity: 0;
  animation: fadeIn 1s ease forwards;
  animation-delay: 0.2s;
}
#about .container {
  position: relative;
  z-index: 1;
  max-width: 1200px;
  width: 100%;
  color: #e0f7fa; /* 清爽淡蓝色字体 */
  transition:
    background 0.5s ease,
    color 0.5s ease,
    transform 0.5s ease;
  background: rgba(255, 255, 255, 0.05);
  border-radius: 16px;
  padding: 2rem;
}

#about .container:hover {
  background: rgba(255, 255, 255, 0.1);
  color: #ffffff;
  transform: translateY(-4px);
  box-shadow: 0 10px 20px rgba(0, 0, 0, 0.25);
}

/* 标题头部动画 */
#about .header {
  text-align: center;
  margin-bottom: 2rem;
  opacity: 0;
  animation: fadeIn 0.8s ease forwards;
  animation-delay: 0.5s;
  transition: transform 0.3s ease;
}

#about .header:hover {
  transform: scale(1.02);
}

#about .header h2 {
  font-size: 2.5rem;
  margin-bottom: 0.5rem;
  color: #ffffff;
}

#about .header .line {
  width: 60px;
  height: 4px;
  background: #1e88e5;
  margin: 0 auto;
  border-radius: 2px;
  transition: background 0.3s ease;
}

#about .header:hover .line {
  background: #42a5f5;
}

/* 两栏布局 */
#about .grid.cols-2 {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 2rem;
}

/* 卡片玻璃风格动画 */
#about .glass.card {
  background: rgba(255, 255, 255, 0.08);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  border-radius: 12px;
  padding: 2rem;
  box-sizing: border-box;
  color: #fff;
  opacity: 0;
  transform: translateY(30px);
  transition:
    transform 0.4s ease,
    background 0.4s ease,
    box-shadow 0.4s ease;
}

/* 卡片 hover 动效 */
#about .glass.card:hover {
  background: rgba(255, 255, 255, 0.15);
  transform: translateY(0) scale(1.02);
  box-shadow: 0 8px 20px rgba(0, 0, 0, 0.3);
}

/* 第一张卡片动画 */
#about .glass.card:nth-of-type(1) {
  animation: slideUpFade 1s ease forwards;
  animation-delay: 0.9s;
}

/* 第二张卡片动画 */
#about .glass.card:nth-of-type(2) {
  animation: slideUpFade 1s ease forwards;
  animation-delay: 1.2s;
}

/* 标题 */
#about .glass.card h3 {
  font-size: 1.3rem;
  margin-bottom: 1rem;
  transition: color 0.3s ease;
}

#about .glass.card:hover h3 {
  color: #90caf9;
}

/* 清爽列表样式 */
#about .clean {
  list-style: none;
  padding: 0;
  margin: 0 0 1rem 0;
}

#about .clean li {
  margin-bottom: 0.5rem;
  line-height: 1.5;
  font-size: 1rem;
  transition: color 0.3s ease;
}

#about .glass.card:hover .clean li {
  color: #e3f2fd;
}

@keyframes slideUpFade {
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* 响应式支持 */
@media (max-width: 768px) {
  #about .grid.cols-2 {
    grid-template-columns: 1fr;
  }
}

/* 动画定义 */
@keyframes fadeIn {
  to {
    opacity: 1;
  }
}