body {
            font-family: Arial, sans-serif;
            background: linear-gradient(135deg, #4fc3f7 0%, #1976d2 100%);
            color: #fff;
            margin: 0;
            padding: 0;
        }
        .container {
            max-width: 600px;
            margin: 60px auto;
            background: rgba(0,0,0,0.5);
            border-radius: 16px;
            padding: 40px 30px;
            box-shadow: 0 8px 32px rgba(0,0,0,0.2);
            text-align: center;
        }
        h1 {
            font-size: 2.5em;
            margin-bottom: 16px;
        }
        p {
            font-size: 1.2em;
            margin-bottom: 24px;
        }
        .download-btn {
            display: inline-block;
            background: #6256a0;
            color: #ffffff;
            padding: 14px 32px;
            border-radius: 8px;
            font-size: 1.1em;
            font-weight: bold;
            text-decoration: none;
            transition: background 0.2s;
        }
        .download-btn:hover {
            background: #6256a0;
        }
        .features {
            margin-top: 32px;
            text-align: left;
        }
        .features li {
            margin-bottom: 12px;
            font-size: 1em;
        }
        .video-preview {
            margin: 30px 0;
        }
        .video-preview video {
            width: 100%;
            border-radius: 12px;
            box-shadow: 0 4px 16px rgba(0,0,0,0.2);
        }


        .main-header {
            display: flex;
            align-items: center;
            justify-content: space-between;
            background: #473e75;
            padding: 20px 40px;
            border-radius: 0 0 16px 16px;
            box-shadow: 0 4px 16px rgba(255, 255, 255, 0.15);
            margin-bottom: 40px;
            position: sticky;
            top: 0;
            z-index: 1000;
        }

        .header-left {
            display: flex;
            align-items: center;
        }

        .header-logo {
            height: 48px;
            width: auto;
            display: block;
        }

        .header-nav ul {
            list-style: none;
            margin: 0;
            padding: 0;
            display: flex;
            gap: 32px;
        }

        .header-nav a {
            color: #ffffff;
            text-decoration: none;
            font-size: 1.1em;
            font-weight: 600;
            transition: color 0.2s;
        }

        .header-nav a:hover {
            color: #fffde7;
        }

        .container img { 
            justify-self: center;
        }

        @media (max-width: 768px) {
    .container {
        padding: 20px 16px;
        margin: 40px 16px;
    }

    .main-header {
        flex-direction: column;
        align-items: flex-start;
        padding: 16px;
    }

    .header-nav ul {
        flex-direction: column;
        gap: 16px;
        margin-top: 16px;
    }

    h1 {
        font-size: 1.8em;
    }

    p {
        font-size: 1em;
    }

    .download-btn {
        padding: 12px 24px;
        font-size: 1em;
    }

    .features li {
        font-size: 0.95em;
    }
}