/* 全局样式定义 */
:root {
  --color-primary: #000;
  --color-secondary: #fff;
  --color-accent: #888;
  --color-bg: #f5f5f5;
  --font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  --transition-duration: 0.3s;
}

/* 基础重置 */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

body {
  font-family: var(--font-family);
  color: var(--color-primary);
  background-color: var(--color-secondary);
  overflow-x: hidden;
}

/* 动画效果 */
.fade-in {
  animation: fadeIn var(--transition-duration) ease-in-out;
}

@keyframes fadeIn {
  from { opacity: 0; }
  to { opacity: 1; }
}

/* 响应式布局 */
.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 20px;
}

@media (max-width: 768px) {
  .container {
    padding: 0 15px;
  }
}

/* 图片加载优化 */
img {
  max-width: 100%;
  height: auto;
  display: block;
  transition: transform var(--transition-duration);
}

img:hover {
  transform: scale(1.02);
}

/* 页脚样式 */
footer {
  text-align: center;
  padding: 20px;
  font-size: 12px;
  color: var(--color-accent);
}