/* 公共样式 */
.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 15px;
}

/* 导航栏样式 */
.header {
  background: #fff;
  box-shadow: 0 2px 10px rgba(0,0,0,0.1);
  position: fixed;
  width: 100%;
  top: 0;
  z-index: 100;
}

.nav {
  display: flex;
  justify-content: space-between;
  align-items: center;
  height: 80px;
}

.logo {
  font-size: 24px;
  font-weight: bold;
}

.nav-menu {
  display: flex;
  gap: 30px;
}

.nav-item {
  position: relative;
}

.nav-item.active::after {
  content: '';
  position: absolute;
  bottom: -5px;
  left: 0;
  width: 100%;
  height: 2px;
  background: #1890ff;
}

/* 响应式导航 */
@media (max-width: 768px) {
  .nav-menu {
    display: none;
    position: absolute;
    top: 80px;
    left: 0;
    width: 100%;
    background: #fff;
    padding: 20px;
    box-shadow: 0 2px 10px rgba(0,0,0,0.1);
  }
  
  .nav-menu.active {
    display: flex;
    flex-direction: column;
  }
  
  .hamburger {
    display: block;
  }
}

/* 按钮样式 */
.btn {
  display: inline-block;
  padding: 8px 24px;
  border-radius: 4px;
  cursor: pointer;
  transition: all 0.3s;
}

.btn-primary {
  background: #1890ff;
  color: #fff;
}

.btn-primary:hover {
  background: #40a9ff;
}