/* CSS重置与全局样式 */
        * {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
        }

        :root {
            --primary-color: #4361ee;
            --secondary-color: #3a0ca3;
            --accent-color: #f72585;
            --light-color: #f8f9fa;
            --dark-color: #212529;
            --gray-color: #6c757d;
            --shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
            --shadow-lg: 0 10px 15px rgba(0, 0, 0, 0.1);
            --border-radius: 8px;
            --transition: all 0.3s ease;
        }

        html {
            scroll-behavior: smooth;
        }

        body {
            font-family: 'Segoe UI', system-ui, -apple-system, sans-serif;
            line-height: 1.6;
            color: var(--dark-color);
            background-color: #fff;
            overflow-x: hidden;
        }

        img {
            max-width: 100%;
            height: auto;
            display: block;
        }

        .container {
            width: 100%;
            max-width: 1440px;
            margin: 0 auto;
            padding: 0 20px;
        }

        .section {
            padding: 80px 0;
        }

        /* 排版 */
        h1,
        h2,
        h3,
        h4 {
            font-weight: 700;
            line-height: 1.2;
            margin-bottom: 1rem;
        }

        h1 {
            font-size: clamp(2.5rem, 5vw, 3.5rem);
        }

        h2 {
            font-size: clamp(2rem, 4vw, 2.8rem);
            text-align: center;
            margin-bottom: 3rem;
            position: relative;
        }

        h2::after {
            content: '';
            position: absolute;
            width: 80px;
            height: 4px;
            background: var(--accent-color);
            bottom: -10px;
            left: 50%;
            transform: translateX(-50%);
            border-radius: 2px;
        }

        p {
            margin-bottom: 1.5rem;
            font-size: 1.1rem;
        }

        .lead {
            font-size: 1.25rem;
            font-weight: 300;
        }

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

        /* 按钮 */
        .btn {
            display: inline-block;
            padding: 12px 30px;
            background-color: var(--primary-color);
            color: white;
            border: none;
            border-radius: var(--border-radius);
            font-weight: 600;
            text-decoration: none;
            cursor: pointer;
            transition: var(--transition);
            font-size: 1rem;
        }

        .btn:hover {
            background-color: var(--secondary-color);
            transform: translateY(-3px);
            box-shadow: var(--shadow);
        }

        .btn-accent {
            background-color: var(--accent-color);
        }

        .btn-accent:hover {
            background-color: #e11575;
        }

        /* 导航栏 - 新增二级菜单样式 */
        header {
            position: fixed;
            top: 0;
            left: 0;
            width: 100%;
            background-color: rgba(255, 255, 255, 0.98);
            box-shadow: var(--shadow);
            z-index: 1000;
            padding: 15px 0;
        }

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

        .logo {
            font-size: 1.8rem;
            font-weight: 800;
            color: var(--primary-color);
            text-decoration: none;
            display: flex;
            align-items: center;
            gap: 10px;
        }

        .nav-links {
            display: flex;
            list-style: none;
            gap: 1.5rem;
        }

        .nav-links>li {
            position: relative;
        }

        .nav-links a {
            text-decoration: none;
            color: var(--dark-color);
            font-weight: 600;
            transition: var(--transition);
            position: relative;
            padding: 8px 0;
            display: flex;
            align-items: center;
            gap: 5px;
        }

        .nav-links>li>a::after {
            content: '';
            position: absolute;
            width: 0;
            height: 2px;
            background: var(--primary-color);
            bottom: 0;
            left: 0;
            transition: width 0.3s ease;
        }

        .nav-links>li>a:hover::after {
            width: 100%;
        }

        .nav-links a:hover {
            color: var(--primary-color);
        }

        /* 二级下拉菜单 */
        .dropdown-menu {
            position: absolute;
            top: 100%;
            left: 0;
            min-width: 220px;
            background-color: white;
            box-shadow: var(--shadow-lg);
            border-radius: var(--border-radius);
            opacity: 0;
            visibility: hidden;
            transform: translateY(10px);
            transition: var(--transition);
            z-index: 1001;
            padding: 10px 0;
        }

        .dropdown-menu li {
            list-style: none;
        }

        .dropdown-menu a {
            display: block;
            padding: 12px 20px;
            color: var(--dark-color);
            transition: var(--transition);
        }

        .dropdown-menu a:hover {
            background-color: #f5f5f5;
            color: var(--primary-color);
            padding-left: 25px;
        }

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

        .mobile-toggle {
            display: none;
            font-size: 1.5rem;
            cursor: pointer;
            color: var(--dark-color);
        }

        /* 大图轮播区域 */
        .hero-slider {
            position: relative;
            height: 600px;
            overflow: hidden;
            margin-top: 70px;
        }

        .slides-container {
            position: relative;
            height: 100%;
            width: 100%;
        }

        .slide {
            position: absolute;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            opacity: 0;
            transition: opacity 0.8s ease;
            display: flex;
            align-items: center;
            justify-content: center;
        }

        .slide.active {
            opacity: 1;
        }

        .slide-content {
            position: relative;
            z-index: 2;
            color: white;
            text-align: center;
            max-width: 800px;
            padding: 0 20px;
        }

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

        .slide-content p {
            font-size: 1.3rem;
            margin-bottom: 2rem;
            text-shadow: 0 1px 5px rgba(0, 0, 0, 0.3);
        }

        .slide-overlay {
            position: absolute;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            background-color: rgba(0, 0, 0, 0.4);
            z-index: 1;
        }

        .slide-image {
            position: absolute;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            object-fit: cover;
        }

        /* 轮播导航按钮 */
        .slider-nav {
            position: absolute;
            bottom: 30px;
            left: 0;
            width: 100%;
            display: flex;
            justify-content: center;
            gap: 15px;
            z-index: 3;
        }

        .slider-dot {
            width: 12px;
            height: 12px;
            border-radius: 50%;
            background-color: rgba(255, 255, 255, 0.5);
            cursor: pointer;
            transition: var(--transition);
        }

        .slider-dot.active {
            background-color: white;
            transform: scale(1.2);
        }

        .slider-arrow {
            position: absolute;
            top: 50%;
            transform: translateY(-50%);
            background-color: rgba(255, 255, 255, 0.2);
            color: white;
            border: none;
            width: 50px;
            height: 50px;
            border-radius: 50%;
            font-size: 1.5rem;
            cursor: pointer;
            transition: var(--transition);
            z-index: 3;
            display: flex;
            align-items: center;
            justify-content: center;
        }

        .slider-arrow:hover {
            background-color: rgba(255, 255, 255, 0.4);
        }

        .prev-arrow {
            left: 30px;
        }

        .next-arrow {
            right: 30px;
        }

        /* 特性部分 */
        .features {
            /*background-color: #f8f9fa;*/
        }

        .feature-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
            gap: 20px;
        }

        .feature-card {
            background: white;
            /*padding: 40px 30px;*/
            border-radius: var(--border-radius);
            box-shadow: var(--shadow);
            transition: var(--transition);
            text-align: center;
        }

        .feature-card:hover {
            transform: translateY(-10px);
        }

        .feature-icon {
            font-size: 3rem;
            color: var(--primary-color);
            margin-bottom: 1.5rem;
        }

        /* 页脚 */
        footer {
            background-color: var(--dark-color);
            color: white;
            padding: 60px 0 30px;
        }

        .footer-content {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
            gap: 40px;
            margin-bottom: 40px;
        }

        .footer-logo {
            font-size: 1.8rem;
            font-weight: 800;
            color: white;
            text-decoration: none;
            margin-bottom: 1rem;
            display: inline-block;
        }

        .footer-links h3 {
            color: white;
            margin-bottom: 1.5rem;
            font-size: 1.3rem;
        }

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

        .footer-links li {
            margin-bottom: 0.8rem;
        }

        .footer-links a {
            color: #adb5bd;
            text-decoration: none;
            transition: var(--transition);
        }

        .footer-links a:hover {
            color: white;
            padding-left: 5px;
        }

        .social-icons {
            display: flex;
            gap: 15px;
            margin-top: 1.5rem;
        }

        .social-icons a {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            width: 40px;
            height: 40px;
            background-color: rgba(255, 255, 255, 0.1);
            border-radius: 50%;
            color: white;
            transition: var(--transition);
        }

        .social-icons a:hover {
            background-color: var(--primary-color);
            transform: translateY(-3px);
        }

        .copyright {
            text-align: center;
            padding-top: 30px;
            border-top: 1px solid rgba(255, 255, 255, 0.1);
            color: #adb5bd;
            font-size: 0.9rem;
        }

        /* 响应式设计 */
        @media (max-width: 992px) {
            .hero-slider {
                height: 500px;
            }

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

            .slide-content p {
                font-size: 1.1rem;
            }

            .slider-arrow {
                width: 40px;
                height: 40px;
                font-size: 1.2rem;
            }

            .prev-arrow {
                left: 15px;
            }

            .next-arrow {
                right: 15px;
            }
        }

        @media (max-width: 768px) {
            .nav-links {
                position: fixed;
                top: 70px;
                left: 0;
                width: 100%;
                background-color: white;
                flex-direction: column;
                align-items: flex-start;
                padding: 20px;
                box-shadow: var(--shadow);
                transform: translateY(-100%);
                opacity: 0;
                visibility: hidden;
                transition: var(--transition);
                z-index: 999;
            }

            .nav-links.active {
                transform: translateY(0);
                opacity: 1;
                visibility: visible;
            }

            .dropdown-menu {
                position: static;
                box-shadow: none;
                opacity: 1;
                visibility: visible;
                transform: none;
                background-color: transparent;
                padding-left: 20px;
                max-height: 0;
                overflow: hidden;
                transition: max-height 0.3s ease;
            }

            .nav-links li:hover .dropdown-menu {
                max-height: 300px;
            }

            .dropdown-menu a {
                padding: 10px 0;
            }

            .dropdown-menu a:hover {
                padding-left: 10px;
            }

            .mobile-toggle {
                display: block;
            }

            .hero-slider {
                height: 400px;
                margin-top: 60px;
            }

            .slide-content h1 {
                font-size: 2rem;
            }

            .slide-content p {
                font-size: 1rem;
            }

            .section {
                padding: 60px 0;
            }

            .feature-grid {
                grid-template-columns: 1fr;
            }
        }

        @media (max-width: 576px) {
            .hero-slider {
                height: 350px;
            }

            .slide-content h1 {
                font-size: 1.8rem;
            }

            .slider-arrow {
                display: none;
            }

            .slider-nav {
                bottom: 15px;
            }

            h1 {
                font-size: 2.2rem;
            }

            h2 {
                font-size: 1.8rem;
            }
        }

        /* 动画效果 */
        @keyframes fadeIn {
            from {
                opacity: 0;
                transform: translateY(20px);
            }

            to {
                opacity: 1;
                transform: translateY(0);
            }
        }

        .fade-in {
            animation: fadeIn 0.8s ease forwards;
        }

        /* 工具类 */
        .mt-1 {
            margin-top: 1rem;
        }

        .mt-2 {
            margin-top: 2rem;
        }

        .mt-3 {
            margin-top: 3rem;
        }

        .mb-1 {
            margin-bottom: 1rem;
        }

        .mb-2 {
            margin-bottom: 2rem;
        }

        .mb-3 {
            margin-bottom: 3rem;
        }