body { font-family: 'Arial', sans-serif; line-height: 1.6; margin: 0; padding: 0; color: #333; background-color: #f5f5f5; }
        .container { max-width: 1200px; margin: 0 auto; padding: 20px; }
        header { background-color: #ff4757; color: white; padding: 15px 0; text-align: center; position: relative; }
        .logo { font-size: 28px; font-weight: bold; text-shadow: 2px 2px 4px rgba(0,0,0,0.3); }
        nav { display: flex; justify-content: center; gap: 20px; margin-top: 10px; }
        nav a { color: white; text-decoration: none; font-weight: bold; }
        .mobile-menu-btn { display: none; position: absolute; top: 15px; right: 20px; background: none; border: none; color: white; font-size: 24px; cursor: pointer; }
        h1 { font-size: 2.5em; margin-bottom: 0.5em; color: #2c3e50; }
        h2 { font-size: 1.8em; margin-top: 1.5em; color: #e74c3c; border-bottom: 2px solid #e74c3c; padding-bottom: 5px; }
        h3 { font-size: 1.4em; margin-top: 1.2em; color: #3498db; }
        p { margin-bottom: 1em; }
        .download-btn, .login-btn { display: inline-block; background-color: #2ecc71; color: white; padding: 12px 25px; text-decoration: none; font-weight: bold; border-radius: 5px; margin: 10px 0; }
        .login-btn { background-color: #3498db; }
        .image-container { text-align: center; margin: 20px 0; }
        .image-container img { max-width: 100%; height: auto; border-radius: 8px; box-shadow: 0 4px 8px rgba(0,0,0,0.1); }
        .table-container { overflow-x: auto; margin: 20px 0; }
        table { width: 100%; border-collapse: collapse; margin: 20px 0; background-color: white; }
        th, td { padding: 12px; text-align: left; border-bottom: 1px solid #ddd; }
        th { background-color: #3498db; color: white; }
        tr:nth-child(even) { background-color: #f2f2f2; }
        .tags { margin: 20px 0; }
        .tag { display: inline-block; background-color: #9b59b6; color: white; padding: 5px 10px; border-radius: 3px; margin: 5px; text-decoration: none; }
        footer { background-color: #2c3e50; color: white; text-align: center; padding: 20px 0; margin-top: 30px; }
        @media (max-width: 768px) {
            nav { flex-direction: column; align-items: center; display: none; }
            .mobile-menu-btn { display: block; }
            nav.active { display: flex; }
            h1 { font-size: 2em; }
            h2 { font-size: 1.5em; }
        }