/* ===== 全局样式 & 主色调 #3b6bf3 ===== */
        * {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
            font-family: 'Segoe UI', 'Microsoft YaHei', sans-serif;
        }

        body {
            color: #333;
            line-height: 1.6;
            background-color: #fff;
            overflow-x: hidden;
        }

        .container {
            width: 100%;
            max-width: 1400px;
            margin: 0 auto;
            padding: 0 20px;
        }

        a {
            text-decoration: none;
            color: inherit;
            transition: all 0.3s ease;
        }

        ul {
            list-style: none;
        }

        .btn {
            display: inline-block;
            padding: 12px 28px;
            background-color: #3b6bf3;      /* 主色 */
            color: white;
            border: none;
            font-weight: 600;
            cursor: pointer;
            transition: all 0.3s ease;
        }

        .btn:hover {
            background-color: #2a4fc7;       /* 深一点的主色 */
            transform: translateY(-2px);
        }

        .btn-outline {
            display: inline-block;
            padding: 12px 28px;
            background-color: transparent;
            color: #000;
            border: 2px solid #000;
            cursor: pointer;
            transition: all 0.3s ease;
        }

        .btn-outline:hover {
            background-color: #3b6bf3;
            color: #fff;
            border-color: #3b6bf3;
            transform: translateY(-2px);
        }

        .section-title {
            font-size: 32px;
            margin-bottom: 20px;
            color: #000;
            position: relative;
            padding-bottom: 15px;
            text-align: center;
        }

        .section-title::after {
            content: '';
            position: absolute;
            bottom: 0;
            left: 50%;
            transform: translateX(-50%);
            width: 60px;
            height: 3px;
            background-color: #3b6bf3;        /* 主色 */
        }

        .section-subtitle {
            font-size: 18px;
            color: #666;
            margin-bottom: 50px;
            max-width: 700px;
            text-align: center;
            margin-left: auto;
            margin-right: auto;
        }

        /* ===== 导航栏 ===== */
        header {
            position: fixed;
            top: 0;
            left: 0;
            width: 100%;
            background-color: rgba(255, 255, 255, 0.98);
            box-shadow: 0 2px 10px rgba(0, 0, 0, 0.08);
            z-index: 1000;
            padding: 15px 0;
        }

        .nav-container {
            display: flex;
            justify-content: space-between;
            align-items: center;
        }

        .logo {
            display: flex;
            align-items: center;
        }

        .logo-icon {
            font-size: 28px;
            color: #3b6bf3;                   /* 主色 */
            margin-right: 10px;
        }
        .logo-icon img{
            height: 56px;
        }

        .logo-text {
            font-size: 24px;
            font-weight: 700;
            color: #000;
        }

        nav ul {
            display: flex;
            align-items: center;
        }

        nav li {
            margin-left: 30px;
            position: relative;
        }

        nav > ul > li > a {
            color: #333;
            position: relative;
            padding: 5px 0;
            font-weight: normal;
            display: flex;
            align-items: center;
        }

        nav > ul > li > a::after {
            content: '';
            position: absolute;
            bottom: 0;
            left: 0;
            width: 0;
            height: 2px;
            background-color: #3b6bf3;        /* 主色 */
            transition: width 0.3s ease;
        }

        nav > ul > li > a:hover {
            color: #3b6bf3;
        }

        nav > ul > li > a:hover::after {
            width: 100%;
        }

        .dropdown-toggle {
            margin-left: 5px;
            font-size: 12px;
        }

        /* 下拉菜单 —— 垂直排列 */
        .dropdown-menu {
            position: absolute;
            top: 100%;
            left: 0;
            background-color: #fff;
            box-shadow: 0 5px 20px rgba(0, 0, 0, 0.1);
            opacity: 0;
            visibility: hidden;
            transform: translateY(10px);
            transition: all 0.3s ease;
            z-index: 100;
            display: block;
            white-space: nowrap;
            border-radius: 4px;
            overflow: hidden;
            min-width: 160px;
        }

        .dropdown-menu li {
            margin: 0;
            width: 100%;
        }

        .dropdown-menu a {
            display: block;
            padding: 12px 20px;
            color: #333;
            transition: all 0.3s ease;
            border-bottom: 1px solid #f0f0f0;
        }

        .dropdown-menu a:hover {
            background-color: #edf2ff;         /* 浅主色背景 */
            color: #3b6bf3;
        }

        .dropdown-menu li:last-child a {
            border-bottom: none;
        }

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

        .mobile-menu-btn {
            display: none;
            font-size: 24px;
            cursor: pointer;
            color: #333;
        }

        /* ===== 轮播图 ===== */
        .hero-section {
            margin-top: 80px;
            width: 100%;
            overflow: hidden;
            padding: 0;
        }

        .hero-slider {
            position: relative;
            height: 600px;
            overflow: hidden;
        }

        .slide {
            position: absolute;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            background-size: cover;
            background-position: center;
            opacity: 0;
            transition: opacity 1s ease;
            display: flex;
            align-items: center;
            justify-content: center;
        }

        .slide.active {
            opacity: 1;
        }

        .slide-content {
            max-width: 800px;
            text-align: center;
            color: white;
            background-color: transparent;
        }

        .slide-title {
            font-size: 48px;
            color: #fff;
            margin-bottom: 20px;
            font-weight: 700;
            text-shadow: 2px 2px 8px rgba(0, 0, 0, 0.8);
        }

        .slide-text {
            font-size: 20px;
            color: #fff;
            margin-bottom: 30px;
            text-shadow: 1px 1px 4px rgba(0, 0, 0, 0.8);
            max-width: 700px;
            margin-left: auto;
            margin-right: auto;
        }

        .slider-dots {
            position: absolute;
            bottom: 30px;
            left: 50%;
            transform: translateX(-50%);
            display: flex;
        }

        .dot {
            width: 12px;
            height: 12px;
            background-color: rgba(255, 255, 255, 0.5);
            border-radius: 50%;
            margin: 0 8px;
            cursor: pointer;
            transition: background-color 0.3s ease;
        }

        .dot.active {
            background-color: #3b6bf3;        /* 主色 */
        }

        /* ===== 平台介绍 ===== */
        .platform-section {
            padding: 80px 0;
        }

        .platform-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 20px;
        }

        .platform-card {
            position: relative;
            height: 550px;
            overflow: hidden;
            box-shadow: 0 5px 20px rgba(0, 0, 0, 0.1);
            transition: transform 0.3s ease, box-shadow 0.3s ease;
            cursor: pointer;
        }

        .platform-card:hover {
            transform: translateY(-10px);
            box-shadow: 0 15px 30px rgba(0, 0, 0, 0.15);
        }

        .platform-bg {
            position: absolute;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            background-size: cover;
            background-position: center;
            transition: transform 0.5s ease;
        }

        .platform-card:hover .platform-bg {
            transform: scale(1.05);
        }

        .platform-overlay {
            position: absolute;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            background: linear-gradient(to bottom, rgba(0, 0, 0, 0.1), rgba(0, 0, 0, 0.8));
            display: flex;
            flex-direction: column;
            justify-content: flex-end;
            padding: 40px;
            color: white;
        }

        .platform-icon {
            font-size: 48px;
            margin-bottom: 25px;
            color: #fff;
        }

        .platform-title {
            font-size: 28px;
            margin-bottom: 20px;
            color: #fff;
            font-weight: 600;
        }

        .platform-desc {
            color: rgba(255, 255, 255, 0.9);
            font-size: 16px;
            line-height: 1.7;
        }

        /* ===== 成功案例 ===== */
        .cases-section {
            padding: 80px 0;
            background-color: #f8f9fa;
        }

        .cases-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 30px;
            margin-bottom: 40px;
        }

        .case-card {
            background-color: #fff;
            box-shadow: 0 5px 15px rgba(0, 0, 0, 0.05);
            transition: transform 0.3s ease, box-shadow 0.3s ease;
            overflow: hidden;
        }

        .case-card:hover {
            transform: translateY(-10px);
            box-shadow: 0 15px 30px rgba(0, 0, 0, 0.1);
        }

        .case-img {
            width: 100%;
            height: 240px;
            object-fit: cover;
            border-bottom: 1px solid #f0f0f0;
        }

        .case-info {
            padding: 20px;
        }

        .case-title {
            font-size: 18px;
            margin-bottom: 8px;
            color: #000;
            font-weight: 600;
        }

        .case-category {
            color: #3b6bf3;                    /* 主色 */
            font-size: 14px;
        }

        .view-more {
            text-align: center;
        }

        /* ===== 新闻动态 ===== */
        .news-section {
            padding: 80px 0;
        }

        .news-list {
            margin-bottom: 40px;
        }

        .news-item {
            display: flex;
            background-color: #fff;
            overflow: hidden;
            margin-bottom: 25px;
            box-shadow: 0 3px 10px rgba(0, 0, 0, 0.05);
            transition: transform 0.3s ease;
        }

        .news-item:hover {
            transform: translateY(-5px);
            box-shadow: 0 8px 20px rgba(0, 0, 0, 0.1);
        }

        .news-img {
            width: 300px;
            height: 200px;
            object-fit: cover;
        }

        .news-content {
            padding: 30px;
            flex: 1;
        }

        .news-title {
            font-size: 20px;
            margin-bottom: 15px;
            color: #000;
            transition: color 0.3s ease;
        }

        .news-item:hover .news-title {
            color: #3b6bf3;                    /* 主色 */
        }

        .news-excerpt {
            color: #666;
            margin-bottom: 15px;
            line-height: 1.7;
        }

        .news-date {
            color: #999;
            font-size: 14px;
        }

        /* ===== 视频介绍 ===== */
        .video-section {
            padding: 80px 0;
            background-color: #f8f9fa;
        }

        .video-showcase {
            position: relative;
            max-width: 1000px;
            margin: 0 auto;
            height: 550px;
            background-image: url('https://picsum.photos/1600/600?random=50');
            background-size: cover;
            background-position: center;
            border-radius: 12px;
            overflow: hidden;
            box-shadow: 0 15px 30px rgba(0,0,0,0.2);
        }

        .video-overlay {
            position: absolute;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            display: flex;
            flex-direction: column;
            align-items: center;
            justify-content: center;
            color: white;
            text-align: center;
        }

        .video-play-icon {
            font-size: 80px;
            color: white;
            margin-bottom: 20px;
            cursor: pointer;
            transition: transform 0.3s, color 0.3s;
        }

        .video-play-icon:hover {
            color: #3b6bf3;                    /* 主色 */
            transform: scale(1.1);
        }

        .video-title {
            font-size: 36px;
            font-weight: 700;
            margin-bottom: 15px;
            text-shadow: 2px 2px 8px rgba(0,0,0,0.6);
        }

        .video-desc {
            font-size: 18px;
            max-width: 600px;
            margin: 0 auto;
            text-shadow: 1px 1px 4px rgba(0,0,0,0.6);
        }

        /* ===== 合作伙伴 (无背景) ===== */
        .partners-section {
            padding: 80px 0;
        }

        .partners-grid {
            display: grid;
            grid-template-columns: repeat(5, 1fr);
            gap: 40px;
            align-items: center;
        }

        .partner-logo {
            height: 70px;
            display: flex;
            align-items: center;
            justify-content: center;
            transition: all 0.3s ease;
        }

        .partner-logo img {
            max-width: 100%;
            max-height: 100%;
            filter: grayscale(0.2);
        }

        .partner-logo:hover {
            opacity: 1;
            filter: grayscale(0);
        }

        /* ===== 底部 ===== */
        footer {
            background-color: #f2f2f2;
            color: #333;
            padding: 60px 0 30px;
        }

        .footer-content {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 40px;
            margin-bottom: 40px;
        }

        .footer-column h3 {
            font-size: 18px;
            margin-bottom: 25px;
            position: relative;
            padding-bottom: 10px;
            color: #000;
        }

        .footer-column h3::after {
            content: '';
            position: absolute;
            bottom: 0;
            left: 0;
            width: 40px;
            height: 2px;
            background-color: #3b6bf3;        /* 主色 */
        }

        .footer-links li {
            margin-bottom: 12px;
        }

        .footer-links a:hover {
            color: #3b6bf3;                    /* 主色 */
        }

        .contact-info li {
            margin-bottom: 15px;
            display: flex;
            align-items: flex-start;
        }

        .contact-info i {
            margin-right: 10px;
            color: #3b6bf3;                    /* 主色 */
        }

        /* 关注我们 二维码区 */
        .qrcode-wrapper {
            display: flex;
            gap: 20px;
            margin-top: 10px;
        }

        .qrcode-item {
            text-align: center;
            background: white;
            padding: 10px;
            border-radius: 8px;
        }

        .qrcode-item img {
            width: 100px;                 /* 主色 */
            margin-bottom: 8px;
        }

        .qrcode-item span {
            font-size: 14px;
            color: #333;
            display: block;
        }

        .copyright {
            text-align: center;
            padding-top: 30px;
            border-top: 1px solid rgba(0, 0, 0, 0.1);
            color: #666;
            font-size: 14px;
        }

        /* ===== 响应式设计 ===== */
        @media (max-width: 1200px) {
            .cases-grid {
                grid-template-columns: repeat(3, 1fr);
            }
            .partners-grid {
                grid-template-columns: repeat(4, 1fr);
            }
            .platform-card {
                height: 500px;
            }
        }

        @media (max-width: 992px) {
            .cases-grid {
                grid-template-columns: repeat(2, 1fr);
            }
            .partners-grid {
                grid-template-columns: repeat(3, 1fr);
            }
            .footer-content {
                grid-template-columns: repeat(2, 1fr);
            }
            .platform-grid {
                grid-template-columns: repeat(2, 1fr);
            }
            .news-img {
                width: 250px;
            }
        }

        @media (max-width: 768px) {
            .mobile-menu-btn {
                display: block;
            }
             .logo-icon img{
            height: 36px;
        }

            nav ul {
                position: fixed;
                top: 80px;
                left: -100%;
                width: 100%;
                height: calc(100vh - 80px);
                background-color: #fff;
                flex-direction: column;
                align-items: center;
                padding-top: 40px;
                transition: left 0.3s ease;
                overflow-y: auto;
            }

            nav.active ul {
                left: 0;
            }

            nav li {
                margin: 0 0 20px 0;
                width: 100%;
                text-align: center;
                flex-direction: column;
                align-items: center;
            }

            nav li a {
                justify-content: center;
                width: 100%;
            }

            .dropdown-menu {
                position: static;
                opacity: 1;
                visibility: visible;
                transform: none;
                box-shadow: none;
                background-color: #f8f8f8;
                width: 80%;
                margin: 10px auto 0;
                display: none;
                flex-direction: column;
                max-height: 200px;
                overflow-y: auto;
                min-width: unset;
            }

            .dropdown-menu.active {
                display: block;
            }

            .dropdown-menu a {
                border-right: none;
                border-bottom: 1px solid #e0e0e0;
                text-align: center;
            }

            .hero-slider {
                height: 500px;
            }
            .slide-title {
                font-size: 30px;
            }
            .news-item {
                flex-direction: column;
            }
            .news-img {
                width: 100%;
                height: 200px;
            }
            .platform-grid {
                grid-template-columns: 1fr;
            }
            .cases-grid {
                grid-template-columns: 1fr;
            }
            .partners-grid {
                grid-template-columns: repeat(2, 1fr);
            }
            .video-showcase {
                height: 450px;
                max-width: 100%;
            }
            .video-title {
                font-size: 28px;
            }
        }

        @media (max-width: 576px) {
            .footer-content {
                grid-template-columns: 1fr;
            }
            .partners-grid {
                grid-template-columns: 1fr;
            }
            .qrcode-wrapper {
                justify-content: center;
            }
        }