:root {
            --primary: #2196f3;
            --primary-dark: #1565c0;
            --primary-light: #42a5f5;
            --accent: #00bcd4;
            --accent-orange: #ff6b35;
            --dark: #1a1a2e;
            --gray-100: #f8f9fa;
            --gray-200: #e9ecef;
            --gray-300: #dee2e6;
            --gray-600: #6c757d;
            --white: #ffffff;
            --shadow-sm: 0 2px 8px rgba(0,0,0,0.08);
            --shadow-md: 0 4px 20px rgba(0,0,0,0.12);
            --shadow-lg: 0 10px 40px rgba(0,0,0,0.15);
            --radius: 12px;
            --radius-lg: 20px;
        }
        
        * { margin: 0; padding: 0; box-sizing: border-box; }
        
        html { scroll-behavior: smooth; }
        
        body {
            font-family: 'Noto Sans SC', -apple-system, BlinkMacSystemFont, sans-serif;
            line-height: 1.7;
            color: var(--dark);
            overflow-x: hidden;
        }

        /* 导航栏 */
        .header {
            background: #0C489B; /* 深蓝色背景 */
            box-shadow: var(--shadow-sm);
            position: sticky;
            top: 0;
            z-index: 1000;
        }
        .header-phone {
            display: flex;
            align-items: center;
            gap: 8px;
            color: #fff;
            font-weight: 600;
            font-size: 15px;
            padding: 8px 16px;
            background: rgba(255,255,255,0.2);
            border-radius: 20px;
        }
        .header-phone i {
            color: #fff;
        }
        .header .container {
            max-width: 1400px;
            margin: 0 auto;
            padding: 0 20px;
            display: flex;
            justify-content: space-between;
            align-items: center;
            height: 70px;
        }
        .logo {
            display: flex;
            align-items: center;
            gap: 12px;
            text-decoration: none;
        }
        .logo-icon {
            width: 50px;
            height: 50px;
            background: linear-gradient(135deg, #0095D9, #00bcd4);
            border-radius: 12px;
            display: flex;
            align-items: center;
            justify-content: center;
            color: var(--white);
            font-size: 24px;
            font-weight: 700;
        }
        .logo-text h1 {
            font-size: 22px;
            color: #fff;
            font-weight: 700;
            letter-spacing: 2px;
        }
        .logo-text p {
            font-size: 12px;
            color: rgba(255,255,255,0.8);
            letter-spacing: 1px;
        }
        
        .nav { display: flex; gap: 2px; align-items: center; }
        .nav > a {
            color: #fff;
            text-decoration: none;
            padding: 10px 12px;
            border-radius: 8px;
            font-weight: 500;
            font-size: 14px;
            transition: all 0.3s;
            display: flex;
            align-items: center;
        }
        .nav > a:hover, .nav > a.active {
            background: #0095D9;
            color: #fff;
        }
        
        /* 下拉菜单 - 修复对齐问题 */
        .nav .dropdown { 
            position: relative;
            display: flex;
            align-items: center;
        }
        .nav .dropdown > a {
            color: #fff;
            text-decoration: none;
            padding: 10px 12px;
            border-radius: 8px;
            font-weight: 500;
            font-size: 14px;
            transition: all 0.3s;
            display: flex;
            align-items: center;
            gap: 5px;
        }
        .nav .dropdown > a i {
            font-size: 10px;
            transition: transform 0.3s;
        }
        .nav .dropdown:hover > a {
            background: #0095D9;
            color: #fff;
        }
        .nav .dropdown:hover > a i {
            transform: rotate(180deg);
        }
        .nav .dropdown-menu {
            position: absolute;
            top: 100%;
            left: 0;
            background: var(--white);
            box-shadow: var(--shadow-lg);
            border-radius: var(--radius);
            min-width: 200px;
            opacity: 0;
            visibility: hidden;
            transform: translateY(10px);
            transition: all 0.3s;
            padding: 10px 0;
            z-index: 1001;
        }
        .nav .dropdown:hover .dropdown-menu {
            opacity: 1;
            visibility: visible;
            transform: translateY(0);
        }
        .nav .dropdown-menu a {
            display: block;
            padding: 12px 20px;
            color: var(--dark);
            text-decoration: none;
            font-weight: 500;
            transition: all 0.3s;
        }
        .nav .dropdown-menu a:hover {
            background: var(--gray-100);
            color: var(--primary);
            padding-left: 25px;
        }

        /* 移动端菜单按钮 */
        .mobile-menu-btn {
            display: none;
            background: none;
            border: none;
            font-size: 24px;
            color: var(--dark);
            cursor: pointer;
            padding: 10px;
        }

        /* Hero区域 */
        .hero {
            position: relative;
            height: 100vh;
            min-height: 700px;
            display: flex;
            align-items: center;
            justify-content: center;
            overflow: hidden;
        }
        .hero-slider {
            position: absolute;
            inset: 0;
            z-index: 0;
        }
        .hero-slide {
            position: absolute;
            inset: 0;
            opacity: 0;
            transition: opacity 1s ease-in-out;
            background-size: cover;
            background-position: center;
            background-repeat: no-repeat;
        }
        .hero-slide.active {
            opacity: 1;
        }
        .hero-slide::after {
            content: '';
            position: absolute;
            inset: 0;
            background: linear-gradient(to bottom, rgba(0,0,0,0.15) 0%, rgba(0,0,0,0.35) 100%);
        }
        .hero-dots {
            position: absolute;
            bottom: 100px;
            left: 50%;
            transform: translateX(-50%);
            display: flex;
            gap: 12px;
            z-index: 10;
        }
        .hero-dot {
            width: 12px;
            height: 12px;
            border-radius: 50%;
            background: rgba(255,255,255,0.4);
            cursor: pointer;
            transition: all 0.3s;
        }
        .hero-dot.active {
            background: #fff;
            transform: scale(1.2);
        }
        .hero::before {
            content: '';
            position: absolute;
            inset: 0;
            background: url('data:image/svg+xml,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 100 100"><defs><pattern id="grid" width="10" height="10" patternUnits="userSpaceOnUse"><path d="M 10 0 L 0 0 0 10" fill="none" stroke="rgba(255,255,255,0.05)" stroke-width="0.5"/></pattern></defs><rect width="100" height="100" fill="url(%23grid)"/></svg>');
            opacity: 0.5;
        }
        .hero-particles {
            position: absolute;
            inset: 0;
            overflow: hidden;
        }
        .hero-particle {
            position: absolute;
            width: 4px;
            height: 4px;
            background: var(--accent);
            border-radius: 50%;
            animation: float 15s infinite;
            opacity: 0.3;
        }
        @keyframes float {
            0%, 100% { transform: translateY(100vh) rotate(0deg); opacity: 0; }
            10% { opacity: 0.3; }
            90% { opacity: 0.3; }
            100% { transform: translateY(-100vh) rotate(720deg); opacity: 0; }
        }
        .hero-content {
            position: absolute;
            top: 50%;
            left: 50%;
            transform: translate(-50%, -50%);
            width: 70%;
            max-width: 900px;
            color: var(--white);
            text-align: center;
            padding: 30px 20px;
            z-index: 2;
            background: rgba(0,0,0,0.08);
            border-radius: 20px;
            backdrop-filter: blur(2px);
        }
        .hero-badge {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            background: rgba(255,255,255,0.15);
            backdrop-filter: blur(10px);
            padding: 10px 24px;
            border-radius: 50px;
            font-size: 14px;
            margin-bottom: 30px;
            border: 1px solid rgba(255,255,255,0.2);
        }
        .hero-badge i { color: var(--accent); }
        .hero h2 {
            font-size: clamp(2rem, 5vw, 4rem);
            font-weight: 900;
            line-height: 1.2;
            margin-bottom: 20px;
            text-shadow: 0 4px 30px rgba(0,0,0,0.3);
        }
        .hero h2 span {
            background: linear-gradient(135deg, #4fc3f7, #00bcd4);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
        }
        .hero-desc {
            font-size: clamp(1rem, 2vw, 1.2rem);
            opacity: 0.9;
            max-width: 700px;
            margin: 0 auto 40px;
            line-height: 1.8;
        }
        .hero-stats {
            display: flex;
            justify-content: center;
            gap: 40px;
            margin-top: 50px;
            flex-wrap: wrap;
        }
        .hero-stat {
            text-align: center;
        }
        .hero-stat h3 {
            font-size: clamp(1.8rem, 3.5vw, 3rem);
            font-weight: 900;
            color: #4fc3f7;
        }
        .hero-stat p {
            font-size: 14px;
            opacity: 0.8;
            margin-top: 5px;
        }
        .hero-btns {
            display: flex;
            justify-content: center;
            gap: 20px;
            flex-wrap: wrap;
        }
        .btn {
            display: inline-flex;
            align-items: center;
            gap: 10px;
            padding: 14px 32px;
            border-radius: 50px;
            font-size: 16px;
            font-weight: 600;
            text-decoration: none;
            transition: all 0.3s;
            border: none;
            cursor: pointer;
        }
        .btn-primary {
            background: linear-gradient(135deg, var(--accent), var(--primary-light));
            color: var(--white);
            box-shadow: 0 8px 30px rgba(0,188,212,0.4);
        }
        .btn-primary:hover {
            transform: translateY(-3px);
            box-shadow: 0 12px 40px rgba(0,188,212,0.5);
        }
        .btn-outline {
            background: transparent;
            color: var(--white);
            border: 2px solid rgba(255,255,255,0.4);
        }
        .btn-outline:hover {
            background: var(--white);
            color: var(--primary);
            border-color: var(--white);
        }
        .scroll-indicator {
            position: absolute;
            bottom: 40px;
            left: 50%;
            transform: translateX(-50%);
            animation: bounce 2s infinite;
        }
        .scroll-indicator i {
            font-size: 24px;
            color: rgba(255,255,255,0.5);
        }
        @keyframes bounce {
            0%, 100% { transform: translateX(-50%) translateY(0); }
            50% { transform: translateX(-50%) translateY(10px); }
        }

        /* 服务区域 */
        .services {
            padding: 100px 0;
            background: var(--gray-100);
            position: relative;
        }
        .container {
            max-width: 1400px;
            margin: 0 auto;
            padding: 0 20px;
        }
        .section-header {
            text-align: center;
            margin-bottom: 60px;
        }
        .section-tag {
            display: inline-block;
            background: linear-gradient(135deg, var(--primary), var(--accent));
            color: var(--white);
            padding: 6px 20px;
            border-radius: 50px;
            font-size: 13px;
            font-weight: 600;
            text-transform: uppercase;
            letter-spacing: 1px;
            margin-bottom: 15px;
        }
        .section-title {
            font-size: clamp(1.6rem, 3.5vw, 2.4rem);
            font-weight: 800;
            color: var(--dark);
            margin-bottom: 15px;
        }
        .section-desc {
            color: var(--gray-600);
            font-size: 16px;
            max-width: 600px;
            margin: 0 auto;
        }
        
        .services-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 25px;
        }
        .service-card {
            background: var(--white);
            border-radius: var(--radius-lg);
            padding: 35px;
            transition: all 0.4s;
            position: relative;
            overflow: hidden;
            border: 1px solid var(--gray-200);
        }
        .service-card::before {
            content: '';
            position: absolute;
            top: 0;
            left: 0;
            width: 100%;
            height: 4px;
            background: linear-gradient(90deg, var(--primary), var(--accent));
            transform: scaleX(0);
            transition: transform 0.4s;
        }
        .service-card:hover {
            transform: translateY(-8px);
            box-shadow: var(--shadow-lg);
            border-color: transparent;
        }
        .service-card:hover::before {
            transform: scaleX(1);
        }
        .service-icon {
            width: 45px;
            height: 45px;
            background: linear-gradient(135deg, var(--primary), var(--accent));
            border-radius: 12px;
            display: flex;
            align-items: center;
            justify-content: center;
            flex-shrink: 0;
        }
        .service-icon i {
            font-size: 20px;
            color: var(--white);
        }
        .service-title {
            display: flex;
            align-items: center;
            gap: 12px;
            margin-bottom: 12px;
        }
        .service-card h3 {
            font-size: 18px;
            font-weight: 700;
            color: var(--dark);
            margin: 0;
        }
        .service-card p {
            color: var(--gray-600);
            line-height: 1.7;
            margin-bottom: 18px;
            font-size: 15px;
        }
        .service-link {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            color: var(--primary);
            font-weight: 600;
            text-decoration: none;
            transition: gap 0.3s;
            font-size: 15px;
        }
        .service-link:hover {
            gap: 12px;
        }

        /* 关于我们 */
        .about {
            padding: 100px 0;
            background: var(--white);
        }
        .about-grid {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 60px;
            align-items: center;
        }
        .about-image {
            position: relative;
        }
        .about-image-main {
            width: 100%;
            height: 400px;
            border-radius: var(--radius-lg);
            box-shadow: var(--shadow-lg);
            object-fit: cover;
        }
        .about-image-badge {
            position: absolute;
            bottom: -20px;
            right: -20px;
            background: linear-gradient(135deg, var(--accent-orange), #ff8c42);
            color: var(--white);
            padding: 25px;
            border-radius: var(--radius-lg);
            text-align: center;
            box-shadow: var(--shadow-lg);
        }
        .about-image-badge h4 {
            font-size: 42px;
            font-weight: 900;
        }
        .about-image-badge p {
            font-size: 13px;
            opacity: 0.9;
        }
        .about-content h2 {
            font-size: clamp(1.6rem, 3vw, 2.2rem);
            font-weight: 800;
            margin-bottom: 20px;
            color: var(--dark);
        }
        .about-content p {
            color: var(--gray-600);
            margin-bottom: 15px;
            line-height: 1.8;
            font-size: 15px;
        }
        .about-features {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 15px;
            margin-top: 30px;
        }
        .about-feature {
            display: flex;
            align-items: flex-start;
            gap: 12px;
        }
        .about-feature i {
            width: 22px;
            height: 22px;
            background: var(--primary);
            color: var(--white);
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 11px;
            flex-shrink: 0;
            margin-top: 3px;
        }
        .about-feature span {
            font-weight: 500;
            color: var(--dark);
            font-size: 15px;
        }

        /* 资质荣誉 */
        .certifications {
            padding: 80px 0;
            background: linear-gradient(135deg, var(--primary-dark), var(--primary));
            color: var(--white);
        }
        .cert-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 25px;
            margin-top: 40px;
        }
        .cert-item {
            background: rgba(255,255,255,0.1);
            backdrop-filter: blur(10px);
            border-radius: var(--radius);
            padding: 25px;
            text-align: center;
            border: 1px solid rgba(255,255,255,0.2);
            transition: all 0.3s;
        }
        .cert-item:hover {
            background: rgba(255,255,255,0.15);
            transform: translateY(-5px);
        }
        .cert-item i {
            font-size: 36px;
            margin-bottom: 12px;
            color: #4fc3f7;
        }
        .cert-item h4 {
            font-size: 16px;
            font-weight: 600;
        }

        /* 案例展示 */
        .cases {
            padding: 100px 0;
            background: var(--gray-100);
        }
        .cases-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
            gap: 25px;
        }
        .case-card {
            background: var(--white);
            border-radius: var(--radius-lg);
            overflow: hidden;
            transition: all 0.4s;
            box-shadow: var(--shadow-sm);
        }
        .case-card:hover {
            transform: translateY(-8px);
            box-shadow: var(--shadow-lg);
        }
        .case-image {
            height: 200px;
            background: linear-gradient(135deg, var(--primary), var(--accent));
            display: flex;
            align-items: center;
            justify-content: center;
            position: relative;
            overflow: hidden;
        }
        .case-image img {
            width: 100%;
            height: 100%;
            object-fit: cover;
        }
        .case-image i {
            font-size: 50px;
            color: rgba(255,255,255,0.3);
        }
        .case-content {
            padding: 22px;
        }
        .case-tag {
            display: inline-block;
            background: var(--gray-100);
            color: var(--primary);
            padding: 4px 12px;
            border-radius: 50px;
            font-size: 12px;
            font-weight: 600;
            margin-bottom: 10px;
        }
        .case-card h3 {
            font-size: 18px;
            font-weight: 700;
            margin-bottom: 8px;
            color: var(--dark);
        }
        .case-card p {
            color: var(--gray-600);
            font-size: 14px;
        }

        /* 公司简介区域（原毛玻璃内容） */
        .company-intro {
            padding: 80px 0;
            background: linear-gradient(135deg, #f8f9fa 0%, #e9ecef 100%);
        }
        .intro-content {
            text-align: center;
            max-width: 1000px;
            margin: 0 auto;
        }
        .intro-badge {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            background: rgba(33,150,243,0.1);
            padding: 10px 24px;
            border-radius: 50px;
            font-size: 14px;
            margin-bottom: 30px;
            color: #2196f3;
        }
        .intro-badge i { color: #2196f3; }
        .intro-title {
            margin-top: 0.83em;
            font-size: clamp(2rem, 5vw, 3.5rem);
            font-weight: 900;
            color: #1a1a2e;
            margin-bottom: 20px;
            line-height: 1.2;
        }
        .intro-title span {
            background: linear-gradient(135deg, #2196f3, #00bcd4);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
        }
        .intro-desc {
            font-size: clamp(1rem, 2vw, 1.2rem);
            color: #666;
            max-width: 700px;
            margin: 0 auto 40px;
            line-height: 1.8;
        }
        .intro-btns {
            display: flex;
            justify-content: center;
            gap: 20px;
            margin-bottom: 50px;
            flex-wrap: wrap;
        }
        .intro-btns .btn {
            padding: 14px 32px;
            border-radius: 50px;
            font-weight: 600;
            text-decoration: none;
            transition: all 0.3s;
        }
        .intro-btns .btn-primary {
            background: linear-gradient(135deg, #2196f3, #00bcd4);
            color: white;
            box-shadow: 0 8px 30px rgba(33,150,243,0.3);
        }
        .intro-btns .btn-primary:hover {
            transform: translateY(-3px);
            box-shadow: 0 12px 40px rgba(33,150,243,0.4);
        }
        .intro-btns .btn-outline {
            background: transparent;
            color: #2196f3;
            border: 2px solid #2196f3;
        }
        .intro-btns .btn-outline:hover {
            background: #2196f3;
            color: white;
        }
        .intro-stats {
            display: flex;
            justify-content: center;
            gap: 60px;
            flex-wrap: wrap;
        }
        .intro-stat {
            text-align: center;
        }
        .intro-stat h3 {
            font-size: clamp(2rem, 4vw, 3rem);
            font-weight: 900;
            color: #2196f3;
            margin-bottom: 5px;
        }
        .intro-stat h3 span {
            font-size: 0.5em;
            font-weight: 600;
        }
        .intro-stat p {
            font-size: 14px;
            color: #666;
        }

        /* 新闻动态 */
        .news {
            padding: 100px 0;
            background: var(--white);
        }
        .news-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
            gap: 25px;
        }
        /* 新闻卡片样式 */
        .news-card h3 a {
            color: #1a1a2e;
            text-decoration: none;
        }
        .news-card h3 a:hover {
            color: #1a1a2e;
            text-decoration: none;
        }
        .news-content p {
            color: var(--gray-600);
        }

        .news-card {
            border-radius: var(--radius-lg);
            overflow: hidden;
            transition: all 0.3s;
            border: 1px solid var(--gray-200);
            background: var(--white);
        }
        .news-card:hover {
            box-shadow: var(--shadow-md);
            border-color: transparent;
        }
        .news-image {
            height: 180px;
            background: linear-gradient(135deg, var(--gray-200), var(--gray-300));
            display: flex;
            align-items: center;
            justify-content: center;
            overflow: hidden;
        }
        .news-image img {
            width: 100%;
            height: 100%;
            object-fit: cover;
        }
        .news-image i {
            font-size: 45px;
            color: var(--gray-600);
        }
        .news-content {
            padding: 22px;
        }
        .news-date {
            color: var(--accent);
            font-size: 13px;
            font-weight: 600;
            margin-bottom: 8px;
        }
        .news-card h3 {
            font-size: 17px;
            font-weight: 600;
            color: var(--dark);
            margin-bottom: 8px;
            line-height: 1.5;
        }
        .news-card p {
            color: var(--gray-600);
            font-size: 14px;
        }

        /* 发展历程 */
        .history {
            padding: 80px 0;
            background: var(--light);
        }
        .timeline {
            position: relative;
            max-width: 1000px;
            margin: 40px auto 0;
            padding-left: 40px;
        }
        .timeline::before {
            content: '';
            position: absolute;
            left: 15px;
            top: 0;
            bottom: 0;
            width: 3px;
            background: var(--primary);
        }
        .timeline-item {
            position: relative;
            padding: 20px 0 20px 50px;
        }
        .timeline-dot {
            position: absolute;
            left: 0;
            top: 20px;
            width: 30px;
            height: 30px;
            background: var(--primary);
            border-radius: 50%;
            border: 3px solid var(--white);
            box-shadow: var(--shadow);
        }
        .timeline-content {
            background: var(--white);
            padding: 15px 25px;
            border-radius: var(--radius);
            box-shadow: var(--shadow-sm);
        }
        .timeline-content h4 {
            color: var(--primary);
            font-size: 1.1rem;
            font-weight: 700;
            margin-bottom: 5px;
        }
        .timeline-content p {
            color: var(--text);
            font-size: 14px;
        }

        /* 技术实力 */
        .tech {
            padding: 80px 0;
            background: var(--white);
        }
        .tech-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 30px;
            margin-top: 40px;
        }
        .tech-card {
            background: var(--light);
            padding: 40px 30px;
            border-radius: var(--radius-lg);
            text-align: center;
            transition: var(--transition);
        }
        .tech-card:hover {
            transform: translateY(-5px);
            box-shadow: var(--shadow);
        }
        .tech-icon {
            width: 80px;
            height: 80px;
            background: linear-gradient(135deg, var(--primary), var(--accent));
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            margin: 0 auto 20px;
        }
        .tech-icon i {
            font-size: 32px;
            color: var(--white);
        }
        .tech-card h3 {
            color: var(--dark);
            font-size: 1.2rem;
            font-weight: 600;
            margin-bottom: 15px;
        }
        .tech-card p {
            color: var(--text);
            font-size: 14px;
            line-height: 1.6;
        }

        /* 合作伙伴 */
        .partners {
            padding: 80px 0;
            background: var(--light);
        }
        .partners-grid {
            display: grid;
            grid-template-columns: repeat(6, 1fr);
            gap: 20px;
            margin-top: 40px;
        }
        .partner-item {
            background: var(--white);
            padding: 15px;
            border-radius: var(--radius);
            box-shadow: var(--shadow-sm);
            display: flex;
            align-items: center;
            justify-content: center;
            transition: var(--transition);
        }
        .partner-item:hover {
            transform: translateY(-3px);
            box-shadow: var(--shadow);
        }
        .partner-item img {
            max-width: 100%;
            max-height: 60px;
            object-fit: contain;
        }

        /* CTA区域 */
        .cta {
            padding: 80px 0;
            background: linear-gradient(135deg, var(--dark), var(--primary-dark));
            color: var(--white);
            text-align: center;
        }
        .cta h2 {
            font-size: clamp(1.6rem, 3vw, 2.2rem);
            font-weight: 800;
            margin-bottom: 15px;
        }
        .cta p {
            font-size: 16px;
            opacity: 0.8;
            margin-bottom: 35px;
            max-width: 600px;
            margin-left: auto;
            margin-right: auto;
        }
        .cta-btns {
            display: flex;
            justify-content: center;
            gap: 20px;
            flex-wrap: wrap;
        }
        .btn-white {
            background: var(--white);
            color: var(--primary);
        }
        .btn-white:hover {
            background: var(--gray-100);
            transform: translateY(-3px);
        }

        /* 页脚 */
        .footer {
            background: var(--dark);
            color: var(--white);
            padding: 60px 0 30px;
        }
        .footer-grid {
            display: grid;
            grid-template-columns: 2fr 1fr 1fr 1fr;
            gap: 40px;
            margin-bottom: 40px;
        }
        .footer-brand h3 {
            font-size: 22px;
            font-weight: 700;
            margin-bottom: 15px;
        }
        .footer-brand p {
            color: rgba(255,255,255,0.7);
            line-height: 1.7;
            margin-bottom: 15px;
            font-size: 14px;
        }
        .footer-social {
            display: flex;
            gap: 12px;
        }
        .footer-social a {
            width: 38px;
            height: 38px;
            background: rgba(255,255,255,0.1);
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            color: var(--white);
            transition: all 0.3s;
        }
        .footer-social a:hover {
            background: var(--primary);
            transform: translateY(-3px);
        }
        .footer-links h4 {
            font-size: 15px;
            font-weight: 600;
            margin-bottom: 20px;
            color: var(--white);
        }
        .footer-links a {
            display: block;
            color: rgba(255,255,255,0.7);
            text-decoration: none;
            margin-bottom: 10px;
            transition: color 0.3s;
            font-size: 14px;
        }
        .footer-links a:hover {
            color: var(--accent);
        }
        .footer-contact p {
            display: flex;
            align-items: center;
            gap: 10px;
            color: rgba(255,255,255,0.7);
            margin-bottom: 12px;
            font-size: 14px;
        }
        .footer-contact i {
            color: var(--accent);
            width: 18px;
        }
        .footer-bottom {
            border-top: 1px solid rgba(255,255,255,0.1);
            padding-top: 25px;
            text-align: center;
            color: rgba(255,255,255,0.5);
            font-size: 13px;
        }

        /* 响应式设计 */
        @media (max-width: 1024px) {
            .about-grid { grid-template-columns: 1fr; gap: 40px; }
            .footer-grid { grid-template-columns: 1fr 1fr; gap: 30px; }
            .hero-stats { gap: 30px; }
            .services-grid { grid-template-columns: repeat(2, 1fr); }
            .cert-grid { grid-template-columns: repeat(2, 1fr); }
            .tech-grid { grid-template-columns: 1fr; }
            .partners-grid { grid-template-columns: repeat(3, 1fr); }
        }
        
        
        /* 移动端导航样式 */
        @media (max-width: 900px) {
            .mobile-menu-btn { display: block; }
            .header-search-icon { display: none !important; }
            .nav { 
                display: none; 
                position: absolute; 
                top: 70px; 
                left: 0; 
                right: 0; 
                background: #fff; 
                flex-direction: column; 
                padding: 15px; 
                box-shadow: 0 4px 20px rgba(0,0,0,0.1); 
                z-index: 999; 
                max-height: 80vh; 
                overflow-y: auto; 
            }
            .nav.show { display: flex; }
            .nav > a, .nav .dropdown > a { 
                width: 100%; 
                justify-content: space-between; 
                padding: 12px 15px; 
                border-radius: 8px; 
            }
            .nav .dropdown-menu { 
                position: static; 
                opacity: 1; 
                visibility: visible; 
                transform: none; 
                box-shadow: none; 
                padding-left: 15px; 
                margin-top: 5px; 
                background: #f8f9fa; 
                border-radius: 8px; 
            }
            .nav .dropdown-menu a { padding: 10px 15px; }
             
        }

@media (max-width: 768px) {
            .nav { display: none; }
            .mobile-menu-btn { display: block; }
            
            .hero { min-height: 600px; }
            .hero-stats { 
                flex-direction: column; 
                gap: 20px; 
            }
            .hero-btns { 
                flex-direction: column; 
                align-items: center;
            }
            .hero-btns .btn { width: 100%; max-width: 300px; justify-content: center; }
            
            .services-grid { grid-template-columns: 1fr; }
            .cert-grid { grid-template-columns: 1fr; }
            .tech-grid { grid-template-columns: 1fr; }
            .partners-grid { grid-template-columns: repeat(2, 1fr); }
            .cases-grid { grid-template-columns: 1fr; }
            .news-grid { grid-template-columns: 1fr; }
            
            /* 视频网格 - 手机端优化 */
            .video-grid { grid-template-columns: repeat(2, 1fr) !important; gap: 15px !important; }
            .video-card .video-thumbnail ~ div { padding: 10px !important; }
            .video-card h4 { font-size: 12px !important; }
            
            .footer-grid { grid-template-columns: 1fr; gap: 25px; }
            
            .about-image-badge { 
                position: relative; 
                bottom: 0; 
                right: 0; 
                margin-top: 20px; 
                display: inline-block;
            }
            
            .about-features { grid-template-columns: 1fr; }
             
        }
        
        @media (max-width: 480px) {
            .hero { min-height: 550px; }
            .hero-content { width: 95%; padding: 0 10px; }
            .hero-badge { padding: 8px 16px; font-size: 12px; }
            .hero h2 { font-size: 1.8rem; }
            .hero-desc { font-size: 0.9rem; }
            
            .service-card { padding: 25px; }
            .case-content { padding: 18px; }
            .news-content { padding: 18px; }
            
            .btn { padding: 12px 24px; font-size: 14px; }
        }

        /* 动画 */
        .fade-in {
            opacity: 0;
            transform: translateY(25px);
            transition: all 0.6s ease;
        }
        .fade-in.visible {
            opacity: 1;
            transform: translateY(0);
        }