/* 现代化导航栏样式 - 白底黑字设计 */

/* 主导航栏容器 */
.nav-menu-modern {
    background-color: #ffffff;
    border-bottom: 1px solid #e5e7eb;
    box-shadow: 0 1px 3px 0 rgba(0, 0, 0, 0.1), 0 1px 2px 0 rgba(0, 0, 0, 0.06);
    position: relative;
    z-index: 1000;
}

/* 导航栏基础样式 */
.nav-menu-modern .navbar {
    padding: 0;
    min-height: 70px;
}

.nav-menu-modern .navbar-nav {
    align-items: center;
}

/* 导航链接基础样式 */
.nav-menu-modern .navbar-nav .nav-link {
    color: #374151 !important;
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    font-weight: 500;
    font-size: 15px;
    padding: 24px 20px !important;
    margin: 0 4px;
    position: relative;
    transition: all 0.3s ease;
    text-decoration: none;
    border-radius: 6px;
}

/* 导航链接悬停效果 */
.nav-menu-modern .navbar-nav .nav-link:hover {
    color: #2563eb !important;
    background-color: #f8fafc;
}

/* 当前激活页面样式 */
.nav-menu-modern .navbar-nav .nav-item.active .nav-link {
    color: #2563eb !important;
    background-color: #eff6ff;
    font-weight: 600;
}

/* 下拉菜单触发器样式 */
.nav-menu-modern .navbar-nav .dropdown-toggle {
    position: relative;
}

.nav-menu-modern .navbar-nav .dropdown-toggle::after {
    display: none; /* 隐藏默认的下拉箭头 */
}

.nav-menu-modern .navbar-nav .dropdown-toggle i {
    margin-left: 6px;
    font-size: 12px;
    transition: transform 0.3s ease;
}

.nav-menu-modern .navbar-nav .dropdown:hover .dropdown-toggle i {
    transform: rotate(180deg);
}

/* 下拉菜单样式 */
.nav-menu-modern .dropdown-menu {
    background: #ffffff;
    border: 1px solid #e5e7eb;
    border-radius: 8px;
    box-shadow: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
    padding: 8px 0;
    margin-top: 8px;
    min-width: 200px;
    border-top: none;
    opacity: 0;
    visibility: hidden;
    transform: translateY(-10px);
    transition: all 0.3s ease;
    display: none;
}

/* 桌面端悬停显示下拉菜单 */
@media (min-width: 992px) {
    .nav-menu-modern .dropdown:hover .dropdown-menu {
        opacity: 1;
        visibility: visible;
        transform: translateY(0);
        display: block !important;
    }
}

/* Bootstrap的show类支持 */
.nav-menu-modern .dropdown-menu.show {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
    display: block !important;
}

/* 移动端点击显示 */
@media (max-width: 991px) {
    .nav-menu-modern .dropdown-menu {
        position: static;
        float: none;
        width: auto;
        margin-top: 0;
        background-color: #f8fafc;
        border: none;
        box-shadow: none;
        opacity: 1;
        visibility: visible;
        transform: none;
        border-radius: 8px;
        margin: 8px 0;
        display: none;
    }
    
    .nav-menu-modern .dropdown-menu.show {
        display: block !important;
    }
}

/* 下拉菜单项样式 */
.nav-menu-modern .dropdown-menu li {
    list-style: none;
}

.nav-menu-modern .dropdown-menu li a {
    color: #374151 !important;
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    font-weight: 400;
    font-size: 14px;
    padding: 12px 20px;
    display: block;
    text-decoration: none;
    border-bottom: none;
    transition: all 0.2s ease;
    border-radius: 4px;
    margin: 0 8px;
}

.nav-menu-modern .dropdown-menu li a:hover {
    color: #2563eb !important;
    background-color: #f1f5f9;
}

.nav-menu-modern .dropdown-menu li.active a {
    color: #2563eb !important;
    background-color: #eff6ff;
    font-weight: 500;
}

/* 登录/注册按钮样式 */
.nav-menu-modern .btn-login {
    background: linear-gradient(135deg, #2563eb 0%, #3b82f6 100%);
    color: #ffffff !important;
    border: none;
    padding: 10px 20px;
    border-radius: 25px;
    font-weight: 500;
    font-size: 14px;
    transition: all 0.3s ease;
    text-decoration: none;
    box-shadow: 0 2px 4px rgba(37, 99, 235, 0.2);
}

.nav-menu-modern .btn-login:hover {
    background: linear-gradient(135deg, #1d4ed8 0%, #2563eb 100%);
    transform: translateY(-1px);
    box-shadow: 0 4px 8px rgba(37, 99, 235, 0.3);
}

.nav-menu-modern .btn-login i {
    margin-right: 6px;
}

.nav-menu-modern .btn-login span {
    margin: 0 4px;
    opacity: 0.8;
}

/* 用户头像下拉菜单 */
.nav-menu-modern .user-avatar .nav-link {
    padding: 12px 16px !important;
    border-radius: 25px;
    background-color: #f8fafc;
}

.nav-menu-modern .user-avatar .nav-link:hover {
    background-color: #e2e8f0;
}

.nav-menu-modern .user-avatar img {
    border-radius: 50%;
    margin-right: 8px;
}

.nav-menu-modern .user-avatar .dropdown-menu {
    right: 0;
    left: auto;
    min-width: 220px;
}

.nav-menu-modern .user-avatar .dropdown-menu .dropdown-item {
    padding: 12px 20px;
    color: #374151;
    font-size: 14px;
    border-radius: 4px;
    margin: 0 8px;
    transition: all 0.2s ease;
}

.nav-menu-modern .user-avatar .dropdown-menu .dropdown-item:hover {
    background-color: #f1f5f9;
    color: #2563eb;
}

.nav-menu-modern .user-avatar .dropdown-menu .dropdown-item i {
    margin-right: 10px;
    width: 16px;
    text-align: center;
}

/* 移动端响应式设计 */
@media (max-width: 991px) {
    .nav-menu-modern .navbar-nav .nav-link {
        padding: 15px 20px !important;
        margin: 2px 0;
        border-radius: 8px;
    }
    
    .nav-menu-modern .dropdown-menu {
        position: static;
        float: none;
        width: auto;
        margin-top: 0;
        background-color: #f8fafc;
        border: none;
        box-shadow: none;
        opacity: 1;
        visibility: visible;
        transform: none;
        border-radius: 8px;
        margin: 8px 0;
    }
    
    .nav-menu-modern .dropdown-menu li a {
        padding: 10px 20px;
        margin: 0;
        border-radius: 0;
    }
    
    .nav-menu-modern .btn-login {
        margin: 10px 20px;
        text-align: center;
    }
}

/* 移动端导航切换按钮 */
.nav-menu-modern .navbar-toggler {
    border: none;
    padding: 8px 12px;
    border-radius: 6px;
    background-color: #f8fafc;
    transition: all 0.3s ease;
}

.nav-menu-modern .navbar-toggler:hover {
    background-color: #e2e8f0;
}

.nav-menu-modern .navbar-toggler:focus {
    outline: none;
    box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.1);
}

.nav-menu-modern .navbar-toggler-icon {
    background-image: url("data:image/svg+xml,%3csvg xmlns='http://www.w3.org/2000/svg' width='30' height='30' viewBox='0 0 30 30'%3e%3cpath stroke='rgba%2855, 65, 81, 1%29' stroke-linecap='round' stroke-miterlimit='10' stroke-width='2' d='M4 7h22M4 15h22M4 23h22'/%3e%3c/svg%3e");
}

/* 动画效果 */
@keyframes fadeInDown {
    from {
        opacity: 0;
        transform: translateY(-10px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.nav-menu-modern .dropdown:hover .dropdown-menu {
    animation: fadeInDown 0.3s ease;
}

/* 额外的视觉增强 */
.nav-menu-modern::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: linear-gradient(90deg, #2563eb 0%, #3b82f6 50%, #2563eb 100%);
}

/* 确保下拉菜单在正确的层级 */
.nav-menu-modern .dropdown-menu {
    z-index: 1050;
}