/* 主导航栏样式 */
.main-navigation {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
    position: relative;
    z-index: 100;
}

.main-navigation .container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

/* 导航菜单 */
.nav-menu {
    display: flex;
    justify-content: center;
    align-items: center;
    list-style: none;
    margin: 0;
    padding: 0;
    height: 80px;
}

.nav-menu li {
    margin: 0 15px;
}

.nav-menu a {
    display: block;
    color: white;
    text-decoration: none;
    padding: 12px 25px;
    font-size: 20px;
    font-weight: 500;
    border-radius: 25px;
    transition: all 0.3s ease;
    position: relative;
    overflow: hidden;
}

/* 悬停效果 */
.nav-menu a:hover {
    background: rgba(255, 255, 255, 0.2);
    transform: translateY(-2px);
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.2);
}

/* 激活状态 */
.nav-menu a.active {
    background: rgba(255, 255, 255, 0.3);
    box-shadow: inset 0 2px 4px rgba(0, 0, 0, 0.1);
}

/* 移动端菜单切换按钮 */
.menu-toggle {
    display: none;
    background: none;
    border: none;
    color: white;
    font-size: 24px;
    cursor: pointer;
    padding: 15px;
    position: absolute;
    right: 20px;
    top: 50%;
    transform: translateY(-50%);
}

/* 移动端响应式设计 */
@media (max-width: 768px) {
    .menu-toggle {
        display: block;
    }
    
    .nav-menu {
        position: absolute;
        top: 100%;
        left: 0;
        width: 100%;
        background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
        flex-direction: column;
        height: auto;
        box-shadow: 0 4px 10px rgba(0, 0, 0, 0.1);
        transform: translateY(-100%);
        opacity: 0;
        visibility: hidden;
        transition: all 0.3s ease;
    }
    
    .nav-menu.active {
        transform: translateY(0);
        opacity: 1;
        visibility: visible;
    }
    
    .nav-menu li {
        margin: 0;
        width: 100%;
    }
    
    .nav-menu a {
        padding: 15px 25px;
        border-radius: 0;
        border-bottom: 1px solid rgba(255, 255, 255, 0.1);
    }
    
    .nav-menu a:hover {
        background: rgba(255, 255, 255, 0.1);
        transform: none;
    }
}

/* 小屏幕优化 */
@media (max-width: 480px) {
    .main-navigation .container {
        padding: 0 15px;
    }
    
    .nav-menu a {
        padding: 12px 20px;
        font-size: 15px;
    }
}

/* 导航栏动画效果 */
.nav-menu a::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.2), transparent);
    transition: left 0.5s;
}

.nav-menu a:hover::before {
    left: 100%;
}