/* 导航栏样式 - 西藏尼木霸沃建筑有限公司 */

.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    height: var(--navbar-height);
    background-color: var(--white-color);
    box-shadow: var(--box-shadow-md);
    z-index: var(--z-index-fixed);
    transition: all var(--transition-base);
}

.navbar-container {
    max-width: var(--container-max-width);
    margin: 0 auto;
    padding: 0 var(--container-padding);
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.navbar-logo {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.navbar-logo-text {
    font-size: var(--font-size-xl);
    font-weight: var(--font-weight-bold);
    color: var(--primary-color);
}

.navbar-logo-text span {
    color: var(--secondary-color);
}

.navbar-menu {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.navbar-item {
    position: relative;
}

.navbar-link {
    display: block;
    padding: var(--spacing-sm) var(--spacing-md);
    font-size: var(--font-size-base);
    font-weight: var(--font-weight-medium);
    color: var(--text-color);
    text-decoration: none;
    transition: color var(--transition-base);
}

.navbar-link:hover,
.navbar-link.active {
    color: var(--secondary-color);
}

/* 下拉菜单 */
.navbar-dropdown {
    position: absolute;
    top: 100%;
    left: 0;
    min-width: 200px;
    background-color: var(--white-color);
    box-shadow: var(--box-shadow-lg);
    border-radius: var(--border-radius-md);
    opacity: 0;
    visibility: hidden;
    transform: translateY(-10px);
    transition: all var(--transition-base);
    z-index: var(--z-index-dropdown);
}

.navbar-item:hover .navbar-dropdown {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.navbar-dropdown-item {
    display: block;
}

.navbar-dropdown-link {
    display: block;
    padding: var(--spacing-sm) var(--spacing-md);
    font-size: var(--font-size-base);
    color: var(--text-color);
    text-decoration: none;
    transition: all var(--transition-fast);
}

.navbar-dropdown-link:hover {
    background-color: var(--background-color);
    color: var(--secondary-color);
    padding-left: var(--spacing-lg);
}

/* 移动端菜单按钮 */
.navbar-toggle {
    display: none;
    flex-direction: column;
    gap: 6px;
    background: none;
    border: none;
    cursor: pointer;
    padding: var(--spacing-xs);
}

.navbar-toggle-bar {
    width: 30px;
    height: 3px;
    background-color: var(--primary-color);
    border-radius: 2px;
    transition: all var(--transition-base);
}

/* 移动端响应式 */
@media (max-width: 992px) {
    .navbar-toggle {
        display: flex;
    }
    
    .navbar-menu {
        position: fixed;
        top: var(--navbar-height);
        left: 0;
        right: 0;
        flex-direction: column;
        background-color: var(--white-color);
        box-shadow: var(--box-shadow-lg);
        max-height: 0;
        overflow: hidden;
        transition: max-height var(--transition-base);
    }
    
    .navbar-menu.active {
        max-height: 600px;
    }
    
    .navbar-item {
        width: 100%;
        border-bottom: 1px solid var(--background-color);
    }
    
    .navbar-link {
        padding: var(--spacing-md);
    }
    
    .navbar-dropdown {
        position: static;
        opacity: 1;
        visibility: visible;
        transform: none;
        box-shadow: none;
        max-height: 0;
        overflow: hidden;
        transition: max-height var(--transition-base);
    }
    
    .navbar-item:hover .navbar-dropdown,
    .navbar-item.active .navbar-dropdown {
        max-height: 500px;
    }
    
    .navbar-dropdown-link {
        padding-left: var(--spacing-xl);
    }
    
    .navbar-toggle.active .navbar-toggle-bar:nth-child(1) {
        transform: rotate(45deg) translate(8px, 8px);
    }
    
    .navbar-toggle.active .navbar-toggle-bar:nth-child(2) {
        opacity: 0;
    }
    
    .navbar-toggle.active .navbar-toggle-bar:nth-child(3) {
        transform: rotate(-45deg) translate(8px, -8px);
    }
}

@media (max-width: 768px) {
    .navbar {
        height: 60px;
    }
    
    .navbar-logo-text {
        font-size: var(--font-size-lg);
    }
}