/* 主导航核心样式（恢复蓝底+固定宽度） */
.navbar {
    background-color: #0A2463 !important; /* 恢复原深海蓝底 */
    box-shadow: 0 2px 8px rgba(0,0,0,0.15);
    width: 100%; /* 主导航宽度100%，内部内容用container限制宽度 */
}

.navbar .container {
    max-width: 1400px; /* 主导航内容宽度不变，和原站一致 */
    margin: 0 auto;
}

.navbar .navbar-brand img {
    height: 40px;
}

.navbar .nav-link {
    color: #fff !important; /* 主导航文字白色 */
    font-weight: 500;
    padding: 15px 20px;
    position: relative;
}

.navbar .nav-link:hover {
    color: #D4AF37 !important; /* hover时金属金 */
}

/* 主导航按钮样式 */
.navbar .btn-warning {
    background-color: #D4AF37 !important; /* 金属金按钮 */
    border-color: #D4AF37 !important;
    color: #000 !important;
    border-radius: 4px;
    padding: 8px 20px;
    margin-left: 15px;
}

/* 宽屏子栏目核心样式（适配宽屏，居中显示） */
.navbar .dropdown-menu.mega-menu {
    background-color: #0A2463; /* 子栏目背景和主导航一致 */
    border: none;
    border-radius: 0;
    box-shadow: 0 6px 12px rgba(0,0,0,0.2);
    padding: 30px;
    width: 100%;
    max-width: 1400px; /* 宽屏子栏目最大宽度，适配大屏 */
    min-width: 1200px; /* 最小宽度，保证宽屏体验 */
    left: 50% !important;
    transform: translateX(-50%) !important; /* 子栏目居中显示 */
    top: 100% !important;
    margin-top: 0;
}

/* 多列子栏目布局 */
.mega-menu .row {
    width: 100%;
    margin: 0;
}

.mega-menu .col-md-4 {
    padding: 0 25px;
    border-right: 1px solid rgba(255,255,255,0.1);
}

.mega-menu .col-md-4:last-child {
    border-right: none;
}

/* 子栏目标题样式 */
.mega-menu .menu-section-title {
    font-size: 1.25rem;
    font-weight: 600;
    color: #D4AF37; /* 金属金标题 */
    margin-bottom: 20px;
    display: flex;
    align-items: center;
    gap: 10px;
}

.mega-menu .menu-section-title::after {
    content: ">";
    color: #fff;
    font-size: 1rem;
}

/* 子栏目图片样式 */
.mega-menu .menu-section-img {
    width: 100%;
    height: 180px;
    object-fit: cover;
    border-radius: 6px;
    margin-bottom: 15px;
    box-shadow: 0 3px 8px rgba(0,0,0,0.2);
}

/* 子栏目列表样式 */
.mega-menu .menu-section-list {
    list-style: none;
    padding: 0;
    margin: 0;
}

.mega-menu .menu-section-list li {
    margin-bottom: 12px;
}

.mega-menu .menu-section-list li a {
    color: #fff;
    text-decoration: none;
    font-size: 0.95rem;
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 5px 0;
}

.mega-menu .menu-section-list li a::before {
    content: "●";
    color: #D4AF37;
    font-size: 0.7rem;
}

.mega-menu .menu-section-list li a:hover {
    color: #D4AF37;
    padding-left: 5px;
    transition: all 0.2s ease;
}

/* 纯文字子栏目样式（Case Studies/About/Resources） */
.navbar .dropdown-menu.simple-menu {
    background-color: #0A2463;
    border: none;
    border-radius: 0;
    box-shadow: 0 6px 12px rgba(0,0,0,0.2);
    padding: 20px 30px;
    min-width: 200px; /* 纯文字子栏目最小宽度 */
    left: 50% !important;
    transform: translateX(-50%) !important; /* 居中显示 */
}

.simple-menu .dropdown-item {
    color: #fff;
    padding: 10px 0;
    border-bottom: 1px solid rgba(255,255,255,0.1);
    font-size: 0.95rem;
}

.simple-menu .dropdown-item:last-child {
    border-bottom: none;
}

.simple-menu .dropdown-item:hover {
    background-color: transparent;
    color: #D4AF37;
    padding-left: 8px;
    transition: all 0.2s ease;
}

/* 响应式适配（大屏保持宽屏，小屏自适应） */
@media (max-width: 1400px) {
    .navbar .dropdown-menu.mega-menu {
        max-width: 100%;
        min-width: 90%;
    }
}

@media (max-width: 992px) {
    /* 移动端主导航适配 */
    .navbar .nav-link {
        padding: 12px 15px;
    }

    /* 移动端子栏目适配 */
    .navbar .dropdown-menu.mega-menu,
    .navbar .dropdown-menu.simple-menu {
        position: static !important;
        transform: none !important;
        width: 100%;
        max-width: 100%;
        min-width: 100%;
        padding: 20px;
        box-shadow: none;
    }

    .mega-menu .col-md-4 {
        border-right: none;
        margin-bottom: 30px;
        padding: 0;
    }

    .mega-menu .menu-section-img {
        height: 150px;
    }
}