* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
  font-family: 'Microsoft YaHei', '思源黑体', sans-serif;
}

body {
  background-color: #f8f9fa;
  color: #333;
  line-height: 1.8;
}

/* 导航栏（与其他页面一致） */
.navbar {
  background-color: #2c3e50;
  color: #fff;
  padding: 1rem 5%;
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  box-shadow: 0 2px 5px rgba(0, 0, 0, 0.1);
}

.navbar-container {
  max-width: 1200px;
  margin: 0 auto;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.logo {
  font-size: 1.5rem;
  font-weight: bold;
  color: #3498db;
}

.nav-links {
  display: flex;
  gap: 2rem;
}

.nav-links a {
  color: #fff;
  text-decoration: none;
  font-weight: 500;
  transition: color 0.3s;
}

.nav-links a:hover,
.nav-links a.active {
  color: #3498db;
}

.dropdown {
  position: relative;
}

.dropdown-content {
  display: none;
  position: absolute;
  background-color: #fff;
  min-width: 150px;
  box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
  border-radius: 4px;
  z-index: 101;
}

.dropdown-content a {
  color: #333;
  padding: 0.5rem 1rem;
  display: block;
}

.dropdown:hover .dropdown-content {
  display: block;
}

/* 新增：二级导航（A链接样式） */
.secondary-nav {
  background-color: #fff;
  border-bottom: 1px solid #eee;
  padding: 0.8rem 5%;
  margin-top: 64px;
  /* 与导航栏高度对齐 */
  position: sticky;
  top: 64px;
  z-index: 90;
  box-shadow: 0 2px 3px rgba(0, 0, 0, 0.03);
}

.secondary-nav-container {
  max-width: 1400px;
  margin: 0 auto;
}

.secondary-nav-links {
  display: flex;
  gap: 2.5rem;
  flex-wrap: wrap;
}

.secondary-nav-links a {
  color: #555;
  text-decoration: none;
  font-size: 1rem;
  font-weight: 500;
  padding: 0.3rem 0;
  border-bottom: 2px solid transparent;
  transition: all 0.3s;
}

.secondary-nav-links a:hover {
  color: #3498db;
}

.secondary-nav-links a.active {
  color: #3498db;
  border-bottom: 2px solid #3498db;
}

/* 主体内容 */
.container {
  max-width: 1000px;
  margin: 8rem auto 3rem;
  padding: 0 2rem;
}