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

    body {
        font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', sans-serif;
        line-height: 1.6;
        color: #333;
        background-color: #fff;
    }

    .l7wf-header {
        background: #fff;
        box-shadow: 0 2px 10px rgba(0,0,0,0.1);
        position: fixed;
        top: 0;
        left: 0;
        right: 0;
        z-index: 1000;
    }

    .l7wf-nav {
        max-width: 1200px;
        margin: 0 auto;
        padding: 0 20px;
        display: flex;
        align-items: center;
        justify-content: space-between;
        height: 70px;
    }

    .l7wf-logo img {
        height: 40px;
        width: auto;
    }

    .l7wf-menu-toggle {
        display: none;
        flex-direction: column;
        background: none;
        border: none;
        cursor: pointer;
        padding: 5px;
    }

    .l7wf-menu-toggle span {
        width: 25px;
        height: 3px;
        background: #333;
        margin: 3px 0;
        transition: 0.3s;
    }

    .l7wf-nav-menu {
        display: flex;
        list-style: none;
        gap: 30px;
    }

    .l7wf-nav-menu a {
        text-decoration: none;
        color: #333;
        font-weight: 500;
        transition: color 0.3s;
        padding: 10px 0;
    }

    .l7wf-nav-menu a:hover,
    .l7wf-nav-menu a.active {
        color: #4A90E2;
    }

    .l7wf-nav-overlay {
        display: none;
        position: fixed;
        top: 0;
        left: 0;
        right: 0;
        bottom: 0;
        background: rgba(0,0,0,0.5);
        z-index: 999;
    }

    .l7wf-main {
        margin-top: 70px;
    }

    .l7wf-page-header {
        background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
        color: white;
        padding: 60px 0;
        text-align: center;
    }

    .l7wf-page-header h1 {
        font-size: 2.5rem;
        margin-bottom: 15px;
        font-weight: 700;
    }

    .l7wf-page-header p {
        font-size: 1.2rem;
        opacity: 0.9;
        max-width: 600px;
        margin: 0 auto;
    }

    .l7wf-container {
        max-width: 1200px;
        margin: 0 auto;
        padding: 0 20px;
    }

    .l7wf-download-section {
        padding: 80px 0;
        background: #f8f9fa;
    }

    .l7wf-download-grid {
        display: grid;
        grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
        gap: 30px;
        margin-top: 50px;
    }

    .l7wf-download-card {
        background: white;
        border-radius: 15px;
        padding: 40px 30px;
        text-align: center;
        box-shadow: 0 10px 30px rgba(0,0,0,0.1);
        transition: transform 0.3s, box-shadow 0.3s;
        position: relative;
        overflow: hidden;
    }

    .l7wf-download-card:hover {
        transform: translateY(-5px);
        box-shadow: 0 20px 40px rgba(0,0,0,0.15);
    }

    .l7wf-download-card::before {
        content: '';
        position: absolute;
        top: 0;
        left: 0;
        right: 0;
        height: 4px;
        background: linear-gradient(90deg, #4A90E2, #50C878);
    }

    .l7wf-platform-icon {
        font-size: 4rem;
        margin-bottom: 20px;
        display: block;
    }

    .l7wf-download-card h3 {
        font-size: 1.5rem;
        margin-bottom: 10px;
        color: #333;
    }

    .l7wf-version-info {
        color: #666;
        margin-bottom: 15px;
    }

    .l7wf-version-info span {
        display: inline-block;
        margin: 0 10px;
    }

    .l7wf-requirements {
        background: #f8f9fa;
        padding: 15px;
        border-radius: 8px;
        margin: 20px 0;
        font-size: 0.9rem;
        color: #666;
    }

    .l7wf-features-list {
        list-style: none;
        margin: 20px 0;
        text-align: left;
    }

    .l7wf-features-list li {
        padding: 5px 0;
        color: #666;
        position: relative;
        padding-left: 20px;
    }

    .l7wf-features-list li::before {
        content: '✓';
        position: absolute;
        left: 0;
        color: #50C878;
        font-weight: bold;
    }

    .l7wf-download-btn {
        background: linear-gradient(135deg, #4A90E2, #50C878);
        color: white;
        padding: 15px 30px;
        border: none;
        border-radius: 25px;
        font-size: 1.1rem;
        font-weight: 600;
        cursor: pointer;
        transition: all 0.3s;
        text-decoration: none;
        display: inline-block;
        margin-top: 20px;
    }

    .l7wf-download-btn:hover {
        transform: translateY(-2px);
        box-shadow: 0 10px 20px rgba(74, 144, 226, 0.3);
    }

    .l7wf-install-section {
        padding: 80px 0;
        background: white;
    }

    .l7wf-section-title {
        text-align: center;
        font-size: 2.2rem;
        margin-bottom: 20px;
        color: #333;
    }

    .l7wf-section-subtitle {
        text-align: center;
        color: #666;
        font-size: 1.1rem;
        margin-bottom: 50px;
        max-width: 600px;
        margin-left: auto;
        margin-right: auto;
    }

    .l7wf-install-steps {
        display: grid;
        grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
        gap: 30px;
        margin-top: 50px;
    }

    .l7wf-install-step {
        text-align: center;
        padding: 30px 20px;
        position: relative;
    }

    .l7wf-step-number {
        width: 60px;
        height: 60px;
        background: linear-gradient(135deg, #4A90E2, #50C878);
        color: white;
        border-radius: 50%;
        display: flex;
        align-items: center;
        justify-content: center;
        font-size: 1.5rem;
        font-weight: bold;
        margin: 0 auto 20px;
    }

    .l7wf-install-step h3 {
        font-size: 1.3rem;
        margin-bottom: 15px;
        color: #333;
    }

    .l7wf-install-step p {
        color: #666;
        line-height: 1.6;
    }

    .l7wf-features-showcase {
        padding: 80px 0;
        background: #f8f9fa;
    }

    .l7wf-showcase-grid {
        display: grid;
        grid-template-columns: 1fr 1fr;
        gap: 60px;
        align-items: center;
        margin-top: 50px;
    }

    .l7wf-showcase-content h3 {
        font-size: 1.8rem;
        margin-bottom: 20px;
        color: #333;
    }

    .l7wf-showcase-content p {
        color: #666;
        font-size: 1.1rem;
        line-height: 1.7;
        margin-bottom: 30px;
    }

    .l7wf-showcase-features {
        list-style: none;
    }

    .l7wf-showcase-features li {
        padding: 10px 0;
        color: #666;
        position: relative;
        padding-left: 30px;
        font-size: 1rem;
    }

    .l7wf-showcase-features li::before {
        content: '🚀';
        position: absolute;
        left: 0;
        font-size: 1.2rem;
    }

    .l7wf-showcase-image {
        text-align: center;
    }

    .l7wf-showcase-image img {
        max-width: 100%;
        height: auto;
        border-radius: 15px;
        box-shadow: 0 20px 40px rgba(0,0,0,0.1);
    }

    .l7wf-stats-section {
        padding: 60px 0;
        background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
        color: white;
    }

    .l7wf-stats-grid {
        display: grid;
        grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
        gap: 40px;
        text-align: center;
    }

    .l7wf-stat-item h3 {
        font-size: 2.5rem;
        margin-bottom: 10px;
        font-weight: 700;
    }

    .l7wf-stat-item p {
        font-size: 1.1rem;
        opacity: 0.9;
    }

    .l7wf-footer {
        background: #2c3e50;
        color: white;
        padding: 60px 0 30px;
    }

    .l7wf-footer-content {
        display: grid;
        grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
        gap: 40px;
        margin-bottom: 40px;
    }

    .l7wf-footer-section h3 {
        margin-bottom: 20px;
        font-size: 1.2rem;
    }

    .l7wf-footer-section ul {
        list-style: none;
    }

    .l7wf-footer-section ul li {
        margin-bottom: 10px;
    }

    .l7wf-footer-section ul li a {
        color: #bdc3c7;
        text-decoration: none;
        transition: color 0.3s;
    }

    .l7wf-footer-section ul li a:hover {
        color: white;
    }

    .l7wf-footer-bottom {
        border-top: 1px solid #34495e;
        padding-top: 30px;
        text-align: center;
        color: #bdc3c7;
    }

    @media (max-width: 768px) {
        .l7wf-menu-toggle {
            display: flex;
        }

        .l7wf-nav-menu {
            display: none;
            position: fixed;
            top: 70px;
            left: 0;
            right: 0;
            background: white;
            flex-direction: column;
            padding: 20px;
            box-shadow: 0 5px 15px rgba(0,0,0,0.1);
        }

        .l7wf-nav-menu.active {
            display: flex;
        }

        .l7wf-nav-overlay.active {
            display: block;
        }

        .l7wf-page-header h1 {
            font-size: 2rem;
        }

        .l7wf-page-header p {
            font-size: 1rem;
        }

        .l7wf-download-grid {
            grid-template-columns: 1fr;
            gap: 20px;
        }

        .l7wf-showcase-grid {
            grid-template-columns: 1fr;
            gap: 40px;
        }

        .l7wf-install-steps {
            grid-template-columns: 1fr;
        }

        .l7wf-stats-grid {
            grid-template-columns: repeat(2, 1fr);
            gap: 30px;
        }

        .l7wf-section-title {
            font-size: 1.8rem;
        }
    }

    @media (max-width: 480px) {
        .l7wf-container {
            padding: 0 15px;
        }

        .l7wf-download-card {
            padding: 30px 20px;
        }

        .l7wf-stats-grid {
            grid-template-columns: 1fr;
        }

        .l7wf-stat-item h3 {
            font-size: 2rem;
        }
    }