* {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
            font-family: 'Segoe UI', sans-serif;
            scroll-behavior: smooth;
        }

        /* 全局动画类 */
        .fade-in {
            opacity: 0;
            transform: translateY(20px);
            transition: opacity 0.6s ease-out, transform 0.6s ease-out;
        }

        .fade-in.visible {
            opacity: 1;
            transform: translateY(0);
        }

        /* 头部导航栏 */
        header {
            position: sticky;
            top: 0;
            background: #f8f9fa;
            padding: 1rem 5%;
            box-shadow: 0 2px 5px rgba(0,0,0,0.1);
            z-index: 1000;
            transition: background-color 0.3s;
        }

        header.scrolled {
            background-color: rgba(248, 249, 250, 0.95);
            backdrop-filter: blur(5px);
        }

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

        .logo {
            font-size: 1.8rem;
            font-weight: bold;
            color: #2c3e50;
            transition: transform 0.3s;
        }

        .logo:hover {
            transform: scale(1.05);
        }

        nav ul {
            display: flex;
            list-style: none;
        }

        nav ul li {
            margin-left: 2rem;
        }

        nav ul li a {
            text-decoration: none;
            color: #34495e;
            font-weight: 500;
            transition: color 0.3s, border-bottom 0.3s;
            position: relative;
        }

        nav ul li a::after {
            content: '';
            position: absolute;
            width: 0;
            height: 2px;
            bottom: -2px;
            left: 0;
            background-color: #2980b9;
            transition: width 0.3s;
        }

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

        /* 首屏核心展示区 */
        .hero {
            height: 80vh;
            background: linear-gradient(rgba(0,0,0,0.2), rgba(0,0,0,0.2)), 
                        url('../imgs/dszb-df.jpg') no-repeat center/cover;
            display: flex;
            align-items: center;
            justify-content: center;
            text-align: center;
            color: white;
            position: relative;
            overflow: hidden;
        }

        .hero::before {
            content: '';
            position: absolute;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            background: rgba(0,0,0,0.2);
            animation: fadeIn 1.5s ease-out;
        }

        .hero-content {
            z-index: 1;
            animation: slideUp 1s ease-out;
        }

        .hero-content h1 {
            font-size: 3.5rem;
            margin-bottom: 1.5rem;
            text-shadow: 0 2px 10px rgba(0,0,0,0.3);
        }

        .hero-content p {
            font-size: 1.3rem;
            margin-bottom: 2.5rem;
            max-width: 800px;
            margin-inline: auto;
            text-shadow: 0 1px 5px rgba(0,0,0,0.2);
        }

        .cta-button {
            display: inline-block;
            padding: 1rem 2.5rem;
            background: #2980b9;
            color: white;
            text-decoration: none;
            border-radius: 30px;
            font-weight: 600;
            transition: transform 0.3s, box-shadow 0.3s;
            box-shadow: 0 4px 15px rgba(41, 128, 185, 0.3);
        }

        .cta-button:hover {
            transform: translateY(-3px);
            box-shadow: 0 6px 20px rgba(41, 128, 185, 0.4);
        }

        /* 产品核心功能模块 */
        .section {
            padding: 8rem 5%;
        }

        .section-title {
            text-align: center;
            font-size: 2.5rem;
            color: #2c3e50;
            margin-bottom: 4rem;
            position: relative;
        }

        .section-title::after {
            content: '';
            position: absolute;
            width: 80px;
            height: 3px;
            background: #2980b9;
            bottom: -10px;
            left: 50%;
            transform: translateX(-50%);
        }

        .feature-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
            gap: 4rem;
        }

        .feature-card {
            padding: 2rem;
            background: white;
            border-radius: 15px;
            box-shadow: 0 5px 15px rgba(0,0,0,0.08);
            text-align: center;
            transition: transform 0.3s, box-shadow 0.3s;
            position: relative;
            overflow: hidden;
        }

        .feature-card::before {
            content: '';
            position: absolute;
            top: 0;
            left: -100%;
            width: 100%;
            height: 3px;
            background: #2980b9;
            transition: left 0.3s;
        }

        .feature-card:hover {
            transform: translateY(-8px);
            box-shadow: 0 10px 25px rgba(0,0,0,0.1);
        }

        .feature-card:hover::before {
            left: 0;
        }

        .feature-icon {
            font-size: 2.5rem;
            color: #2980b9;
            margin-bottom: 1.5rem;
            transition: transform 0.3s;
        }

        .feature-card:hover .feature-icon {
            transform: scale(1.2) rotate(5deg);
        }

        .feature-card h3 {
            color: #34495e;
            margin-bottom: 1rem;
        }

        .feature-card p {
            color: #7f8c8d;
        }

        /* 成功案例展示模块 */
        .case-studies {
            background: #f8f9fa;
        }

        .case-slider {
            overflow: hidden;
            position: relative;
        }

        .case-card {
            display: none;
            padding: 2rem;
            background: white;
            border-radius: 15px;
            box-shadow: 0 5px 15px rgba(0,0,0,0.08);
            transform: scale(0.95);
            opacity: 0;
            transition: transform 0.5s, opacity 0.5s;
        }

        .case-card.active {
            display: block;
            transform: scale(1);
            opacity: 1;
        }

        .case-title {
            font-size: 1.8rem;
            color: #2c3e50;
            margin-bottom: 1rem;
        }

        .case-info {
            color: #7f8c8d;
            margin-bottom: 2rem;
        }

        .case-image {
            max-width: 100%;
            height: 300px;
            object-fit: cover;
            border-radius: 10px;
            margin-bottom: 2rem;
            background: url('https://via.placeholder.com/800x300?text=Case+Image') no-repeat center/cover;
            transition: transform 0.5s;
        }

        .case-card:hover .case-image {
            transform: scale(1.02);
        }

        .case-buttons {
            text-align: center;
            margin-top: 3rem;
        }

        .case-btn {
            display: inline-block;
            width: 15px;
            height: 15px;
            background: #bdc3c7;
            border-radius: 50%;
            margin: 0 5px;
            cursor: pointer;
            transition: background 0.3s, transform 0.3s;
        }

        .case-btn:hover {
            transform: scale(1.2);
        }

        .case-btn.active {
            background: #2980b9;
        }

        /* 合作方案模块 */
        .pricing-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
            gap: 3rem;
            justify-items: center;
        }

        .pricing-card {
            background: white;
            border-radius: 15px;
            box-shadow: 0 5px 15px rgba(0,0,0,0.08);
            text-align: center;
            padding: 2.5rem;
            width: 100%;
            max-width: 400px;
            transition: transform 0.3s, box-shadow 0.3s;
            position: relative;
            overflow: hidden;
        }

        .pricing-card:hover {
            transform: translateY(-8px);
            box-shadow: 0 15px 30px rgba(0,0,0,0.1);
        }

        .pricing-card::before {
            content: '';
            position: absolute;
            top: 0;
            right: 0;
            width: 100px;
            height: 100px;
            background: #2980b9;
            transform: translate(50%, -50%) rotate(45deg);
            transition: transform 0.3s;
        }

        .pricing-card:hover::before {
            transform: translate(40%, -40%) rotate(45deg);
        }

        .pricing-card h3 {
            color: #2c3e50;
            font-size: 1.8rem;
            margin-bottom: 1rem;
        }

        .price {
            font-size: 2.5rem;
            color: #2980b9;
            font-weight: 600;
            margin-bottom: 1.5rem;
        }

        .plan-features {
            list-style: none;
            margin-bottom: 2rem;
        }

        .plan-features li {
            padding: 0.8rem 0;
            color: #7f8c8d;
            border-bottom: 1px solid #ecf0f1;
            transition: color 0.3s;
        }

        .pricing-card:hover .plan-features li {
            color: #34495e;
        }

        .plan-features li:last-child {
            border-bottom: none;
        }

        /* 客户评价模块 */
        .testimonials {
            background: linear-gradient(135deg, #2980b9, #3498db);
            color: white;
            position: relative;
            overflow: hidden;
        }

        .testimonials::before {
            content: '';
            position: absolute;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            background: url('https://picsum.photos/id/1048/1920/1080') no-repeat center/cover;
            opacity: 0.1;
            z-index: 0;
        }

        .testimonial-card {
            display: grid;
            grid-template-columns: 150px 1fr;
            gap: 2rem;
            align-items: center;
            margin-bottom: 2rem;
            background: rgba(255, 255, 255, 0.1);
            backdrop-filter: blur(5px);
            padding: 2rem;
            border-radius: 15px;
            transition: transform 0.3s;
        }

        .testimonial-card:hover {
            transform: translateY(-5px);
        }

        .testimonial-image {
            width: 100px;
            height: 100px;
            border-radius: 50%;
            background: url('https://via.placeholder.com/100x100?text=Avatar') no-repeat center/cover;
            border: 3px solid rgba(255, 255, 255, 0.3);
            transition: transform 0.3s;
        }

        .testimonial-card:hover .testimonial-image {
            transform: scale(1.1);
        }

        .testimonial-content p {
            font-style: italic;
            font-size: 1.2rem;
            line-height: 1.6;
        }

        .testimonial-author {
            font-weight: 600;
            color: #ecf0f1;
            margin-top: 0.5rem;
        }

        /* 联系我们模块 */
        .contact-container {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 4rem;
            max-width: 1200px;
            margin: 0 auto;
        }

        .contact-form form {
            display: grid;
            gap: 1.5rem;
        }

        .form-group label {
            display: block;
            margin-bottom: 0.5rem;
            font-weight: 500;
            color: #34495e;
            transition: color 0.3s;
        }

        .form-group input,
        .form-group textarea {
            width: 100%;
            padding: 0.8rem;
            border: 1px solid #bdc3c7;
            border-radius: 5px;
            font-size: 1rem;
            transition: border-color 0.3s, box-shadow 0.3s;
        }

        .form-group input:focus,
        .form-group textarea:focus {
            outline: none;
            border-color: #2980b9;
            box-shadow: 0 0 0 3px rgba(41, 128, 185, 0.2);
        }

        .form-group input:focus + label,
        .form-group textarea:focus + label {
            color: #2980b9;
        }

        .contact-info h3 {
            font-size: 1.5rem;
            color: #2c3e50;
            margin-bottom: 1.5rem;
        }

        .contact-info p {
            margin-bottom: 1rem;
            color: #7f8c8d;
            display: flex;
            align-items: center;
            transition: transform 0.3s;
        }

        .contact-info p:hover {
            transform: translateX(5px);
        }

        .contact-info p i {
            margin-right: 0.8rem;
            color: #2980b9;
            font-size: 1.2rem;
            width: 20px;
            text-align: center;
        }

        /* 底部信息区 */
        footer {
            background: #2c3e50;
            color: white;
            padding: 4rem 5%;
            position: relative;
        }

        footer::before {
            content: '';
            position: absolute;
            top: 0;
            left: 0;
            width: 100%;
            height: 3px;
            background: linear-gradient(90deg, #2980b9, #3498db);
        }

        .footer-top {
            display: grid;
            grid-template-columns: 2fr 1fr 1fr;
            gap: 3rem;
            margin-bottom: 3rem;
        }

        .footer-top ul {
            list-style: none;
        }

        .footer-top ul li {
            margin-bottom: 1rem;
        }

        .footer-top ul li a {
            color: #bdc3c7;
            text-decoration: none;
            transition: color 0.3s;
        }

        .footer-top ul li a:hover {
            color: #2980b9;
        }
        

        .footer-logo {
            font-size: 1.8rem;
            font-weight: bold;
            margin-bottom: 1.5rem;
            transition: transform 0.3s;
        }

        .footer-logo:hover {
            transform: scale(1.05);
        }

        .contact-info p {
            margin-bottom: 0.8rem;
            color: #bdc3c7;
        }

        .social-links a {
            display: inline-block;
            width: 40px;
            height: 40px;
            background: #34495e;
            color: white;
            border-radius: 50%;
            text-align: center;
            line-height: 40px;
            margin-right: 10px;
            transition: background 0.3s, transform 0.3s;
        }

        .social-links a:hover {
            background: #2980b9;
            transform: scale(1.1);
        }

        .footer-bottom {
            text-align: center;
            padding-top: 2rem;
            border-top: 1px solid #34495e;
            color: #bdc3c7;
        }

        /* 响应式设计 */
        @media (max-width: 768px) {
            .nav-container {
                flex-direction: column;
                align-items: flex-start;
            }

            nav ul {
                margin-top: 1.5rem;
            }

            .hero-content h1 {
                font-size: 2.5rem;
            }

            .feature-grid, 
            .footer-top,
            .contact-container {
                grid-template-columns: 1fr;
            }

            .testimonial-card {
                grid-template-columns: 1fr;
                text-align: center;
                justify-items: center;
            }
        }

        /* 动画关键帧 */
        @keyframes fadeIn {
            from { opacity: 0; }
            to { opacity: 1; }
        }

        @keyframes slideUp {
            from { 
                opacity: 0;
                transform: translateY(30px);
            }
            to { 
                opacity: 1;
                transform: translateY(0);
            }
        }