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

        body {
            font-family: 'Microsoft YaHei', Arial, sans-serif;
            line-height: 1.6;
            color: #333;
            background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
        }

        .zt31tn-container {
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 20px;
        }

        .zt31tn-header {
            background: rgba(255, 255, 255, 0.95);
            backdrop-filter: blur(10px);
            box-shadow: 0 2px 20px rgba(0, 0, 0, 0.1);
            position: fixed;
            top: 0;
            left: 0;
            right: 0;
            z-index: 1000;
        }

        .zt31tn-nav {
            display: flex;
            justify-content: space-between;
            align-items: center;
            padding: 15px 0;
        }

        .zt31tn-logo {
            display: flex;
            align-items: center;
            font-size: 24px;
            font-weight: bold;
            color: #2c3e50;
            text-decoration: none;
        }

        .zt31tn-logo img {
            height: 40px;
            margin-right: 10px;
        }

        .zt31tn-nav-menu {
            display: flex;
            list-style: none;
            gap: 30px;
        }

        .zt31tn-nav-link {
            text-decoration: none;
            color: #2c3e50;
            font-weight: 500;
            transition: all 0.3s ease;
            padding: 8px 16px;
            border-radius: 25px;
        }

        .zt31tn-nav-link:hover {
            background: linear-gradient(45deg, #667eea, #764ba2);
            color: white;
            transform: translateY(-2px);
        }

        .zt31tn-main {
            margin-top: 80px;
            min-height: 100vh;
        }

        .zt31tn-hero {
            background: linear-gradient(135deg, rgba(102, 126, 234, 0.9), rgba(118, 75, 162, 0.9));
            color: white;
            padding: 100px 0;
            text-align: center;
        }

        .zt31tn-hero-title {
            font-size: 48px;
            font-weight: bold;
            margin-bottom: 20px;
            text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.3);
        }

        .zt31tn-hero-subtitle {
            font-size: 24px;
            margin-bottom: 30px;
            opacity: 0.9;
        }

        .zt31tn-hero-description {
            font-size: 18px;
            max-width: 800px;
            margin: 0 auto 40px;
            line-height: 1.8;
        }

        .zt31tn-cta-button {
            display: inline-block;
            background: linear-gradient(45deg, #ff6b6b, #ee5a24);
            color: white;
            padding: 15px 40px;
            font-size: 20px;
            font-weight: bold;
            text-decoration: none;
            border-radius: 50px;
            transition: all 0.3s ease;
            box-shadow: 0 8px 25px rgba(0, 0, 0, 0.2);
        }

        .zt31tn-cta-button:hover {
            transform: translateY(-3px);
            box-shadow: 0 12px 35px rgba(0, 0, 0, 0.3);
        }

        .zt31tn-features {
            background: white;
            padding: 80px 0;
        }

        .zt31tn-section-title {
            text-align: center;
            font-size: 36px;
            color: #2c3e50;
            margin-bottom: 60px;
            position: relative;
        }

        .zt31tn-section-title::after {
            content: '';
            position: absolute;
            bottom: -10px;
            left: 50%;
            transform: translateX(-50%);
            width: 80px;
            height: 4px;
            background: linear-gradient(45deg, #667eea, #764ba2);
            border-radius: 2px;
        }

        .zt31tn-features-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
            gap: 40px;
        }

        .zt31tn-feature-card {
            background: white;
            padding: 40px 30px;
            border-radius: 15px;
            box-shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
            text-align: center;
            transition: all 0.3s ease;
            border: 1px solid #f0f0f0;
        }

        .zt31tn-feature-card:hover {
            transform: translateY(-10px);
            box-shadow: 0 20px 50px rgba(0, 0, 0, 0.15);
        }

        .zt31tn-feature-icon {
            font-size: 48px;
            margin-bottom: 20px;
            background: linear-gradient(45deg, #667eea, #764ba2);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
        }

        .zt31tn-feature-title {
            font-size: 24px;
            color: #2c3e50;
            margin-bottom: 15px;
            font-weight: bold;
        }

        .zt31tn-feature-description {
            color: #666;
            line-height: 1.6;
        }

        .zt31tn-about {
            background: linear-gradient(135deg, #f8f9fa, #e9ecef);
            padding: 80px 0;
        }

        .zt31tn-about-content {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 60px;
            align-items: center;
        }

        .zt31tn-about-text {
            font-size: 18px;
            line-height: 1.8;
            color: #555;
        }

        .zt31tn-about-text h3 {
            color: #2c3e50;
            font-size: 28px;
            margin-bottom: 20px;
        }

        .zt31tn-about-image {
            text-align: center;
        }

        .zt31tn-about-image img {
            max-width: 100%;
            border-radius: 15px;
            box-shadow: 0 15px 40px rgba(0, 0, 0, 0.1);
        }

        .zt31tn-download {
            background: linear-gradient(135deg, #667eea, #764ba2);
            color: white;
            padding: 80px 0;
            text-align: center;
        }

        .zt31tn-download-title {
            font-size: 36px;
            margin-bottom: 20px;
        }

        .zt31tn-download-description {
            font-size: 18px;
            margin-bottom: 40px;
            opacity: 0.9;
        }

        .zt31tn-download-buttons {
            display: flex;
            justify-content: center;
            gap: 20px;
            flex-wrap: wrap;
        }

        .zt31tn-download-btn {
            display: inline-block;
            background: rgba(255, 255, 255, 0.2);
            color: white;
            padding: 15px 30px;
            text-decoration: none;
            border-radius: 10px;
            transition: all 0.3s ease;
            backdrop-filter: blur(10px);
            border: 1px solid rgba(255, 255, 255, 0.3);
        }

        .zt31tn-download-btn:hover {
            background: rgba(255, 255, 255, 0.3);
            transform: translateY(-2px);
        }

        .zt31tn-footer {
            background: #2c3e50;
            color: white;
            padding: 60px 0 30px;
        }

        .zt31tn-footer-content {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
            gap: 40px;
            margin-bottom: 40px;
        }

        .zt31tn-footer-section h4 {
            font-size: 20px;
            margin-bottom: 20px;
            color: #ecf0f1;
        }

        .zt31tn-footer-section p,
        .zt31tn-footer-section a {
            color: #bdc3c7;
            text-decoration: none;
            line-height: 1.6;
        }

        .zt31tn-footer-section a:hover {
            color: #3498db;
        }

        .zt31tn-footer-bottom {
            text-align: center;
            padding-top: 30px;
            border-top: 1px solid #34495e;
            color: #95a5a6;
        }

        @media (max-width: 768px) {
            .zt31tn-nav-menu {
                display: none;
            }

            .zt31tn-hero-title {
                font-size: 32px;
            }

            .zt31tn-hero-subtitle {
                font-size: 18px;
            }

            .zt31tn-about-content {
                grid-template-columns: 1fr;
                gap: 40px;
            }

            .zt31tn-download-buttons {
                flex-direction: column;
                align-items: center;
            }
        }