/* 加载动画样式 */
        .loader-container {
            position: fixed;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            background-color: #4361ee;
            display: flex;
            flex-direction: column;
            justify-content: center;
            align-items: center;
            z-index: 9999;
            transition: opacity 0.5s ease;
        }

        .loader {
            width: 50px;
            height: 50px;
            border: 5px solid rgba(255, 255, 255, 0.3);
            border-radius: 50%;
            border-top-color: white;
            animation: spin 1s ease-in-out infinite;
        }

        .loader-text {
            color: white;
            margin-top: 20px;
            font-size: 1.2rem;
            font-weight: 500;
        }

        @keyframes spin {
            to { transform: rotate(360deg); }
        }

        /* 主样式 */
        :root {
            --primary-color: #4361ee;
            --secondary-color: #3a0ca3;
            --accent-color: #f72585;
            --text-color: #2b2d42;
            --light-text: #8d99ae;
            --bg-color: #f8f9fa;
            --card-bg: #ffffff;
            --header-bg: rgba(255, 255, 255, 0.95);
            --shadow: 0 4px 20px rgba(0, 0, 0, 0.08);
            --border: 1px solid #e9ecef;
            --border-radius: 12px;
            --transition: all 0.3s cubic-bezier(0.25, 0.8, 0.25, 1);
        }

        [data-theme="dark"] {
            --primary-color: #4895ef;
            --secondary-color: #4361ee;
            --accent-color: #f72585;
            --text-color: #f8f9fa;
            --light-text: #adb5bd;
            --bg-color: #121212;
            --card-bg: #1e1e1e;
            --header-bg: rgba(30, 30, 30, 0.95);
            --shadow: 0 4px 20px rgba(0, 0, 0, 0.3);
            --border: 1px solid #333;
        }

        * {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
        }

        body {
            font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
            color: var(--text-color);
            background-color: var(--bg-color);
            line-height: 1.6;
            transition: var(--transition);
            overflow-x: hidden;
        }

        /* 滚动条样式 */
        ::-webkit-scrollbar {
            width: 8px;
        }

        ::-webkit-scrollbar-track {
            background: var(--bg-color);
        }

        ::-webkit-scrollbar-thumb {
            background: var(--primary-color);
            border-radius: 4px;
        }

        /* 头部样式 */
        .header {
            position: fixed;
            top: 0;
            left: 0;
            width: 100%;
            background-color: var(--header-bg);
            backdrop-filter: blur(10px);
            padding: 1.5rem 5%;
            display: flex;
            justify-content: space-between;
            align-items: center;
            box-shadow: var(--shadow);
            z-index: 1000;
            transition: var(--transition);
        }

        .header.scrolled {
            padding: 1rem 5%;
            box-shadow: 0 4px 15px rgba(0, 0, 0, 0.1);
        }

        .logo {
            display: flex;
            align-items: center;
            gap: 0.75rem;
            font-size: 1.5rem;
            font-weight: 700;
            color: var(--primary-color);
            text-decoration: none;
        }

        .logo-icon {
            font-size: 1.8rem;
        }

        .nav-container {
            display: flex;
            align-items: center;
            gap: 2rem;
        }

        .nav-links {
            display: flex;
            gap: 2rem;
        }

        .nav-links a {
            color: var(--text-color);
            text-decoration: none;
            font-weight: 500;
            position: relative;
            transition: var(--transition);
        }

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

        .nav-links a::after {
            content: '';
            position: absolute;
            bottom: -5px;
            left: 0;
            width: 0;
            height: 2px;
            background-color: var(--primary-color);
            transition: width 0.3s ease;
        }

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

        .nav-actions {
            display: flex;
            align-items: center;
            gap: 1rem;
        }

        .btn {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            padding: 0.75rem 1.5rem;
            background-color: var(--primary-color);
            color: white;
            border: none;
            border-radius: var(--border-radius);
            text-decoration: none;
            font-weight: 600;
            cursor: pointer;
            transition: var(--transition);
            gap: 0.5rem;
        }

        .btn:hover {
            background-color: var(--secondary-color);
            transform: translateY(-2px);
            box-shadow: 0 6px 15px rgba(67, 97, 238, 0.3);
        }

        .btn-outline {
            background-color: transparent;
            border: 2px solid var(--primary-color);
            color: var(--primary-color);
        }

        .btn-outline:hover {
            background-color: var(--primary-color);
            color: white;
        }

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

        .btn-accent:hover {
            background-color: #d91a6d;
        }

        .btn-free {
            background-color: #4cc9f0;
        }

        .btn-free:hover {
            background-color: #3aa8d0;
        }

        .theme-toggle {
            background: none;
            border: none;
            color: var(--text-color);
            cursor: pointer;
            font-size: 1.2rem;
            display: flex;
            align-items: center;
            gap: 0.5rem;
            padding: 0.5rem;
            border-radius: 50%;
            transition: var(--transition);
        }

        .theme-toggle:hover {
            background-color: rgba(67, 97, 238, 0.1);
        }

        .mobile-menu-btn {
            display: none;
            background: none;
            border: none;
            color: var(--text-color);
            font-size: 1.5rem;
            cursor: pointer;
        }

        /* 英雄区域 */
        .hero {
            padding: 12rem 5% 6rem;
            text-align: center;
            max-width: 1200px;
            margin: 0 auto;
            position: relative;
        }

        .hero-content {
            max-width: 800px;
            margin: 0 auto;
            position: relative;
            z-index: 2;
        }

        .hero h1 {
            font-size: 3.5rem;
            margin-bottom: 1.5rem;
            line-height: 1.2;
            background: linear-gradient(90deg, var(--primary-color), var(--accent-color));
            -webkit-background-clip: text;
            background-clip: text;
            color: transparent;
        }

        .hero p {
            font-size: 1.25rem;
            margin-bottom: 2.5rem;
            color: var(--light-text);
            max-width: 700px;
            margin-left: auto;
            margin-right: auto;
        }

        .hero-actions {
            display: flex;
            gap: 1.5rem;
            justify-content: center;
            margin-bottom: 3rem;
        }

        .hero-image {
            width: 100%;
            max-width: 900px;
            margin: 3rem auto 0;
            border-radius: var(--border-radius);
            box-shadow: var(--shadow);
            overflow: hidden;
            position: relative;
            z-index: 1;
        }

        .hero-image img {
            width: 100%;
            height: auto;
            display: block;
            transition: transform 0.5s ease;
        }

        .hero-image:hover img {
            transform: scale(1.02);
        }

        /* 优势标签 */
        .advantages {
            display: flex;
            justify-content: center;
            flex-wrap: wrap;
            gap: 1.5rem;
            margin-top: 2rem;
        }

        .advantage-tag {
            display: flex;
            align-items: center;
            gap: 0.5rem;
            background-color: rgba(76, 201, 240, 0.1);
            color: #4cc9f0;
            padding: 0.5rem 1.25rem;
            border-radius: 20px;
            font-weight: 600;
            font-size: 0.9rem;
        }

        /* 功能区域 */
        .features {
            padding: 6rem 5%;
            max-width: 1400px;
            margin: 0 auto;
        }

        .section-title {
            text-align: center;
            margin-bottom: 5rem;
            position: relative;
        }

        .section-title h2 {
            font-size: 2.5rem;
            margin-bottom: 1rem;
            position: relative;
            display: inline-block;
        }

        .section-title h2::after {
            content: '';
            position: absolute;
            bottom: -10px;
            left: 50%;
            transform: translateX(-50%);
            width: 80px;
            height: 4px;
            background: linear-gradient(90deg, var(--primary-color), var(--accent-color));
            border-radius: 2px;
        }

        .section-title p {
            color: var(--light-text);
            max-width: 700px;
            margin: 0 auto;
        }

        .features-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
            gap: 2.5rem;
        }

        .feature-card {
            background-color: var(--card-bg);
            border-radius: var(--border-radius);
            padding: 2.5rem 2rem;
            box-shadow: var(--shadow);
            border: var(--border);
            transition: var(--transition);
            position: relative;
            overflow: hidden;
        }

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

        .feature-card::before {
            content: '';
            position: absolute;
            top: 0;
            left: 0;
            width: 4px;
            height: 0;
            background: linear-gradient(to bottom, var(--primary-color), var(--accent-color));
            transition: height 0.3s ease;
        }

        .feature-card:hover::before {
            height: 100%;
        }

        .feature-icon {
            font-size: 2.5rem;
            margin-bottom: 1.5rem;
            color: var(--primary-color);
            transition: var(--transition);
        }

        .feature-card:hover .feature-icon {
            transform: scale(1.1);
            color: var(--accent-color);
        }

        .feature-card h3 {
            margin-bottom: 1rem;
            font-size: 1.5rem;
        }

        .feature-card p {
            color: var(--light-text);
            margin-bottom: 1.5rem;
        }

        .feature-link {
            display: inline-flex;
            align-items: center;
            color: var(--primary-color);
            font-weight: 600;
            text-decoration: none;
            transition: var(--transition);
        }

        .feature-link i {
            margin-left: 0.5rem;
            transition: transform 0.3s ease;
        }

        .feature-link:hover {
            color: var(--accent-color);
        }

        .feature-link:hover i {
            transform: translateX(5px);
        }

        /* 安全特性区域 */
        .security {
            padding: 6rem 5%;
            background-color: var(--card-bg);
            position: relative;
        }

        .security::before {
            content: '';
            position: absolute;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            background: linear-gradient(135deg, rgba(67, 97, 238, 0.05) 0%, rgba(247, 37, 133, 0.05) 100%);
            z-index: 0;
        }

        .security-container {
            max-width: 1200px;
            margin: 0 auto;
            position: relative;
            z-index: 1;
        }

        .security-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
            gap: 2rem;
            margin-top: 3rem;
        }

        .security-card {
            background-color: var(--card-bg);
            border-radius: var(--border-radius);
            padding: 2rem;
            box-shadow: var(--shadow);
            border: var(--border);
            transition: var(--transition);
            text-align: center;
        }

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

        .security-icon {
            width: 80px;
            height: 80px;
            background-color: rgba(67, 97, 238, 0.1);
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            margin: 0 auto 1.5rem;
            font-size: 2rem;
            color: var(--primary-color);
        }

        /* 免费特性区域 */
        .free-features {
            padding: 6rem 5%;
            max-width: 1200px;
            margin: 0 auto;
        }

        .free-features-list {
            margin-top: 3rem;
        }

        .free-feature {
            display: flex;
            align-items: flex-start;
            gap: 1.5rem;
            margin-bottom: 2rem;
            padding: 1.5rem;
            border-radius: var(--border-radius);
            background-color: var(--card-bg);
            box-shadow: var(--shadow);
        }

        .free-feature-icon {
            font-size: 1.5rem;
            color: #4cc9f0;
            margin-top: 0.25rem;
        }

        .free-feature-content h3 {
            margin-bottom: 0.5rem;
            color: var(--primary-color);
        }

        /* 简单便捷区域 */
        .easy-steps {
            padding: 6rem 5%;
            background-color: var(--card-bg);
        }

        .steps-container {
            max-width: 1000px;
            margin: 0 auto;
        }

        .steps {
            display: flex;
            flex-direction: column;
            gap: 2rem;
            margin-top: 3rem;
            position: relative;
        }

        .steps::before {
            content: '';
            position: absolute;
            top: 0;
            left: 30px;
            height: 100%;
            width: 2px;
            background-color: var(--primary-color);
            opacity: 0.2;
        }

        .step {
            display: flex;
            gap: 1.5rem;
            position: relative;
        }

        .step-number {
            width: 60px;
            height: 60px;
            background-color: var(--primary-color);
            color: white;
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1.5rem;
            font-weight: 700;
            flex-shrink: 0;
            z-index: 1;
        }

        .step-content {
            background-color: var(--card-bg);
            border-radius: var(--border-radius);
            padding: 1.5rem;
            box-shadow: var(--shadow);
            flex: 1;
        }

        .step-content h3 {
            margin-bottom: 0.5rem;
        }

        /* 常见问题 */
        .faq {
            padding: 6rem 5%;
            max-width: 800px;
            margin: 0 auto;
        }

        .accordion {
            margin-top: 3rem;
        }

        .accordion-item {
            margin-bottom: 1rem;
            border-radius: var(--border-radius);
            overflow: hidden;
            box-shadow: var(--shadow);
            border: var(--border);
        }

        .accordion-header {
            background-color: var(--card-bg);
            padding: 1.5rem;
            cursor: pointer;
            display: flex;
            justify-content: space-between;
            align-items: center;
            font-weight: 600;
            transition: var(--transition);
        }

        .accordion-header:hover {
            background-color: rgba(67, 97, 238, 0.05);
        }

        .accordion-header i {
            transition: transform 0.3s ease;
        }

        .accordion-item.active .accordion-header i {
            transform: rotate(180deg);
        }

        .accordion-content {
            max-height: 0;
            overflow: hidden;
            transition: max-height 0.3s ease;
            background-color: var(--card-bg);
        }

        .accordion-content-inner {
            padding: 0 1.5rem 1.5rem;
        }

        /* 联系我们 */
        .contact {
            padding: 6rem 5%;
            background-color: var(--card-bg);
        }

        .contact-container {
            max-width: 1200px;
            margin: 0 auto;
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
            gap: 3rem;
        }

        .contact-info h3 {
            font-size: 1.5rem;
            margin-bottom: 1.5rem;
        }

        .contact-details {
            display: flex;
            flex-direction: column;
            gap: 1.5rem;
        }

        .contact-item {
            display: flex;
            align-items: flex-start;
            gap: 1rem;
        }

        .contact-item i {
            font-size: 1.25rem;
            color: var(--primary-color);
            margin-top: 0.25rem;
        }

        .contact-form {
            background-color: var(--card-bg);
            border-radius: var(--border-radius);
            padding: 2rem;
            box-shadow: var(--shadow);
        }

        .form-group {
            margin-bottom: 1.5rem;
        }

        .form-group label {
            display: block;
            margin-bottom: 0.5rem;
            font-weight: 500;
        }

        .form-control {
            width: 100%;
            padding: 0.75rem 1rem;
            border: var(--border);
            border-radius: var(--border-radius);
            background-color: var(--bg-color);
            color: var(--text-color);
            transition: var(--transition);
        }

        .form-control:focus {
            outline: none;
            border-color: var(--primary-color);
            box-shadow: 0 0 0 3px rgba(67, 97, 238, 0.2);
        }

        textarea.form-control {
            min-height: 150px;
            resize: vertical;
        }

        /* 页脚 */
        .footer {
            background-color: var(--card-bg);
            padding: 4rem 5% 2rem;
            border-top: var(--border);
        }

        .footer-container {
            max-width: 1400px;
            margin: 0 auto;
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
            gap: 3rem;
        }

        .footer-logo {
            display: flex;
            align-items: center;
            gap: 0.75rem;
            font-size: 1.5rem;
            font-weight: 700;
            color: var(--primary-color);
            text-decoration: none;
            margin-bottom: 1.5rem;
        }

        .footer-about p {
            color: var(--light-text);
            margin-bottom: 1.5rem;
        }

        .social-links {
            display: flex;
            gap: 1rem;
        }

        .social-link {
            display: flex;
            align-items: center;
            justify-content: center;
            width: 40px;
            height: 40px;
            border-radius: 50%;
            background-color: rgba(67, 97, 238, 0.1);
            color: var(--primary-color);
            transition: var(--transition);
        }

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

        .footer-links h4 {
            font-size: 1.25rem;
            margin-bottom: 1.5rem;
            position: relative;
            display: inline-block;
        }

        .footer-links h4::after {
            content: '';
            position: absolute;
            bottom: -8px;
            left: 0;
            width: 40px;
            height: 3px;
            background-color: var(--primary-color);
            border-radius: 2px;
        }

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

        .footer-links li {
            margin-bottom: 0.75rem;
        }

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

        .footer-links a:hover {
            color: var(--primary-color);
            padding-left: 5px;
        }

        .footer-newsletter p {
            color: var(--light-text);
            margin-bottom: 1.5rem;
        }

        .newsletter-form {
            display: flex;
            gap: 0.5rem;
        }

        .newsletter-input {
            flex: 1;
            padding: 0.75rem 1rem;
            border: var(--border);
            border-radius: var(--border-radius);
            background-color: var(--bg-color);
            color: var(--text-color);
        }

        .newsletter-input:focus {
            outline: none;
            border-color: var(--primary-color);
        }

        .footer-bottom {
            text-align: center;
            padding-top: 3rem;
            margin-top: 3rem;
            border-top: var(--border);
            color: var(--light-text);
            font-size: 0.9rem;
        }

        /* 返回顶部按钮 */
        .back-to-top {
            position: fixed;
            bottom: 2rem;
            right: 2rem;
            width: 50px;
            height: 50px;
            background-color: var(--primary-color);
            color: white;
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1.25rem;
            cursor: pointer;
            opacity: 0;
            visibility: hidden;
            transition: var(--transition);
            z-index: 999;
            box-shadow: 0 4px 15px rgba(67, 97, 238, 0.3);
        }

        .back-to-top.visible {
            opacity: 1;
            visibility: visible;
        }

        .back-to-top:hover {
            background-color: var(--secondary-color);
            transform: translateY(-5px);
        }

        /* 响应式设计 */
        @media (max-width: 1024px) {
            .hero h1 {
                font-size: 2.8rem;
            }
        }

        @media (max-width: 768px) {
            .header {
                padding: 1rem 5%;
            }

            .nav-links {
                position: fixed;
                top: 80px;
                left: -100%;
                width: 80%;
                height: calc(100vh - 80px);
                background-color: var(--card-bg);
                flex-direction: column;
                align-items: center;
                padding: 2rem 0;
                transition: left 0.3s ease;
                box-shadow: 2px 0 10px rgba(0, 0, 0, 0.1);
                z-index: 999;
            }

            .nav-links.active {
                left: 0;
            }

            .mobile-menu-btn {
                display: block;
            }

            .hero {
                padding: 9rem 5% 4rem;
            }

            .hero h1 {
                font-size: 2.2rem;
            }

            .hero p {
                font-size: 1.1rem;
            }

            .hero-actions {
                flex-direction: column;
                gap: 1rem;
            }

            .btn {
                width: 100%;
            }

            .section-title h2 {
                font-size: 2rem;
            }

            .step {
                flex-direction: column;
            }

            .steps::before {
                left: 30px;
                top: 0;
                height: calc(100% - 60px);
            }
        }

        @media (max-width: 480px) {
            .hero h1 {
                font-size: 1.8rem;
            }

            .feature-card, .security-card {
                padding: 1.5rem;
            }

            .footer-container {
                grid-template-columns: 1fr;
            }
        }

        /* 动画效果 */
        @keyframes fadeIn {
            from {
                opacity: 0;
                transform: translateY(20px);
            }
            to {
                opacity: 1;
                transform: translateY(0);
            }
        }

        .animate {
            animation: fadeIn 0.6s ease forwards;
        }

        .delay-1 {
            animation-delay: 0.2s;
        }

        .delay-2 {
            animation-delay: 0.4s;
        }

        .delay-3 {
            animation-delay: 0.6s;
        }