/**
 * 企业官网系统 - 主样式文件
 * 基于Bootstrap 5和自定义样式
 */

/* CSS自定义属性 */
:root {
    --primary-color: #007bff;
    --secondary-color: #6c757d;
    --success-color: #28a745;
    --danger-color: #dc3545;
    --warning-color: #ffc107;
    --info-color: #17a2b8;
    --light-color: #f8f9fa;
    --dark-color: #343a40;
    
    --font-family-sans-serif: 'PingFang SC', 'Helvetica Neue', Helvetica, Arial, sans-serif;
    --font-family-monospace: 'SFMono-Regular', Menlo, Monaco, Consolas, 'Liberation Mono', 'Courier New', monospace;
    
    --border-radius: 0.375rem;
    --border-radius-sm: 0.25rem;
    --border-radius-lg: 0.5rem;
    --border-radius-xl: 1rem;
    
    --box-shadow: 0 0.125rem 0.25rem rgba(0, 0, 0, 0.075);
    --box-shadow-sm: 0 0.125rem 0.25rem rgba(0, 0, 0, 0.075);
    --box-shadow-lg: 0 1rem 3rem rgba(0, 0, 0, 0.175);
    
    --transition: all 0.3s ease;
}

/* 基础样式重置 */
* {
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-family-sans-serif);
    line-height: 1.6;
    color: var(--dark-color);
    background-color: #fff;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* 页面加载器 */
.page-loader {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: #fff;
    z-index: 9999;
    display: flex;
    align-items: center;
    justify-content: center;
}

.loader-content {
    text-align: center;
}

/* ▼▼▼ NEW STYLE: Top Banner (Purple) ▼▼▼ */
.top-banner {
    background: linear-gradient(90deg, #6e46e6 0%, #a45ded 100%);
    color: white;
    padding: 0.75rem 1.5rem;
    display: flex;
    justify-content: center;
    align-items: center;
    position: relative;
    font-size: 0.9rem;
    transition: all 0.5s ease;
}
.top-banner .banner-content a {
    background-color: rgba(255, 255, 255, 0.9);
    color: #6e46e6;
    border-radius: 99px;
    padding: 0.3rem 1rem;
    text-decoration: none;
    font-weight: 500;
    margin-left: 1rem;
    display: inline-block;
    transition: background-color 0.3s ease;
}
.top-banner .banner-content a:hover {
    background-color: #fff;
}
.top-banner .banner-close-btn {
    position: absolute;
    right: 2rem;
    top: 50%;
    transform: translateY(-50%);
    background: none;
    border: none;
    color: rgba(255, 255, 255, 0.7);
    font-size: 1.5rem;
    line-height: 1;
    cursor: pointer;
    padding: 0.5rem;
}
.top-banner .banner-close-btn:hover {
    color: #fff;
}
/* ▲▲▲ END NEW STYLE ▲▲▲ */


/* 导航样式 */
.header {
    transition: var(--transition);
}

.navbar-brand img {
    transition: var(--transition);
}

.navbar-nav .nav-link {
    font-weight: 500;
    padding: 0.75rem 1.5rem;
    color: var(--dark-color);
    transition: var(--transition);
    position: relative;
    font-size: 1rem;
}

.navbar-nav .nav-item:not(.has-megamenu) > .nav-link:hover,
.navbar-nav .nav-item:not(.has-megamenu) > .nav-link.active {
    color: var(--primary-color);
}
.navbar-nav .nav-item:not(.has-megamenu) > .nav-link.active::after {
    content: '';
    position: absolute;
    bottom: 8px; 
    left: 50%;
    transform: translateX(-50%);
    width: 24px;
    height: 2px;
    background-color: var(--primary-color);
    border-radius: 1px;
}

/* ================================================= */
/* Mega Menu (样式) STYLES                     */
/* ================================================= */
.nav-item.has-megamenu {
    position: static;
    padding-bottom: 1rem;
    margin-bottom: -1rem;
}
.nav-item.has-megamenu > .nav-link:hover {
    color: var(--primary-color);
}

.mega-menu-wrapper {
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background-color: #fff;
    box-shadow: 0 8px 30px rgba(0, 0, 0, 0.1);
    padding: 1rem;
    z-index: 1050;
    animation: fadeIn 0.3s ease;
    margin-top: -1rem; 
}
.nav-item.has-megamenu:hover > .mega-menu-wrapper {
    display: block;
}

.mega-menu-inner {
    max-width: 1140px; 
    margin: 0 auto;
    display: flex;
    background-color: #fff;
    border-radius: var(--border-radius-lg);
    overflow: hidden;
}

/* 左侧二级导航 */
.mega-menu-nav {
    flex-shrink: 0;
    width: 240px;
    padding: 1.5rem;
    background-color: #f8f9fa;
}
.mega-menu-nav .nav-link {
    color: var(--dark-color);
    padding: 0.7rem 1rem;
    font-size: 0.95rem;
    border-radius: var(--border-radius);
    margin-bottom: 0.5rem;
    font-weight: 500;
    text-align: left;
    position: relative;
}
.mega-menu-nav .nav-link:hover {
    background-color: #e9ecef;
}
.mega-menu-nav .nav-link.active {
    background-color: #e7f1ff;
    color: var(--primary-color);
}
/* ▼▼▼ MODIFICATION: REMOVED the ::after rule for the underline ▼▼▼ */
/* The .mega-menu-nav .nav-link.active::after block has been deleted. */

/* 右侧三级内容面板 */
.mega-menu-content-panes {
    flex-grow: 1;
    padding: 2.5rem;
}
.mega-menu-content {
    display: none;
}
.mega-menu-content.active {
    display: block;
}
.mega-menu-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(180px, 1fr));
    gap: 1rem 1.5rem;
}
.mega-menu-item {
    text-decoration: none;
    color: var(--dark-color);
    display: flex;
    align-items: center;
    gap: 0.75rem;
    padding: 0.5rem;
    border-radius: var(--border-radius);
    transition: background-color 0.2s ease;
}
.mega-menu-item:hover {
    background-color: #f8f9fa;
}
.mega-menu-item .icon {
    font-size: 1.1rem;
    color: var(--primary-color);
    flex-shrink: 0;
}
.mega-menu-item .title {
    font-weight: 400;
}

/* 右侧推广卡片 */
.mega-menu-promo {
    background-color: #f0f4ff;
    padding: 1.5rem;
    border-radius: var(--border-radius);
    text-decoration: none;
    color: inherit;
    display: block;
}
.mega-menu-promo img {
    max-width: 100%;
    border-radius: var(--border-radius-sm);
    margin-bottom: 1rem;
}
.mega-menu-promo .promo-title {
    font-weight: 600;
}
.mega-menu-promo .promo-text {
    font-size: 0.9rem;
    color: var(--secondary-color);
}
.mega-menu-promo .promo-link {
    font-weight: 500;
    color: var(--primary-color);
}
.mega-menu-promo .promo-link:hover {
    text-decoration: underline;
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(10px); }
    to { opacity: 1; transform: translateY(0); }
}

/* 响应式调整 */
@media (max-width: 991.98px) {
    .top-banner {
        font-size: 0.6rem;

        text-align: center;
        
        flex-direction: column;
        padding: 0.5rem 1rem;
    }
    .top-banner .banner-close-btn {
        top: 1.1rem;
        right: 0.5rem;
    }
    .navbar-nav {
        padding-top: 1rem;
    }
    .nav-item.has-megamenu {
        padding-bottom: 0;
        margin-bottom: 0;
    }
    
    .has-megamenu > .nav-link {
        display: flex;
        justify-content: space-between;
        align-items: center;
    }
    .mega-menu-wrapper {
        position: static !important;
        box-shadow: none !important;
        padding: 0 !important;
        display: none !important;
        margin-top: 0;
    }
    .mega-menu-inner {
        flex-direction: column;
    }
    .mega-menu-nav {
        width: 100%;
        background: none;
        padding: 0.5rem 0;
    }
    .mega-menu-content-panes {
        padding: 0.5rem 0;
    }
    .mega-menu-content {
        display: block !important;
    }
    .mega-menu-promo {
        display: none;
    }
}