/* ====== 清爽亮色风，白底 + 橙色点缀 ====== */
body {
  margin: 0;
  padding: 0;
  font-family: "STHeiti", "PingFang SC", sans-serif;
  background: #fff;
  color: #333;
}
.navbar {
  background: #ff7f50;
  padding: 10px 20px;
}
.navbar ul {
  margin: 0;
  padding: 0;
  list-style: none;
  display: flex;
  justify-content: center;
}
.navbar li {
  margin: 0 15px;
}
.navbar a {
  color: #fff;
  text-decoration: none;
  font-weight: bold;
  font-size: 16px;
}
/* 标题区域 */
.title {
  text-align: center;
  margin: 30px 0;
}
.title h2 {
  font-size: 32px;
  color: #ff7f50;
}
/* 网格布局 */
.grid-container {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
  gap: 20px;
  margin: 0 40px 40px 40px;
}
.grid-item {
  position: relative;
  overflow: hidden;
  border: 1px solid #ddd;
  border-radius: 4px;
}
.grid-item img {
  width: 100%;
  display: block;
  transition: transform 0.3s ease, filter 0.3s ease;
  filter: grayscale(100%);
}
.grid-item:hover img {
  transform: scale(1.1);
  filter: grayscale(0%);
}
.grid-item .caption {
  position: absolute;
  bottom: 0;
  left: 0;
  width: 100%;
  background: rgba(0, 0, 0, 0.6);
  color: #fff;
  padding: 5px;
  font-size: 14px;
  text-align: center;
  opacity: 0;
  transition: opacity 0.3s ease;
}
.grid-item:hover .caption {
  opacity: 1;
}
/* 底部版权 */
.footer {
  text-align: center;
  font-size: 12px;
  color: #999;
  padding: 20px;
}

/* ====== 响应式设计 ====== */
@media (max-width: 768px) {
  .navbar ul {
    flex-direction: column;
    align-items: center;
  }
  
  .navbar li {
    margin: 5px 0;
  }
  
  .title h2 {
    font-size: 24px;
  }
  
  .grid-container {
    grid-template-columns: repeat(auto-fill, minmax(150px, 1fr));
    gap: 15px;
    margin: 0 20px 30px 20px;
  }
}

@media (max-width: 480px) {
  .title h2 {
    font-size: 20px;
  }
  
  .grid-container {
    grid-template-columns: repeat(auto-fill, minmax(120px, 1fr));
    gap: 10px;
    margin: 0 10px 20px 10px;
  }
  
  .grid-item .caption {
    font-size: 12px;
    padding: 3px;
  }
}