body { font-family: 'Arial', sans-serif; line-height: 1.6; margin: 0; padding: 0; color: #333; background-color: #f5f5f5; }
        header { background-color: #003366; color: white; padding: 1rem; text-align: center; position: relative; }
        .logo { font-size: 2rem; font-weight: bold; text-shadow: 2px 2px 4px rgba(0,0,0,0.5); }
        nav { display: flex; justify-content: center; gap: 1.5rem; margin-top: 1rem; }
        nav a { color: white; text-decoration: none; font-weight: bold; }
        .mobile-menu-btn { display: none; position: absolute; top: 1rem; right: 1rem; background: none; border: none; color: white; font-size: 1.5rem; cursor: pointer; }
        main { max-width: 1200px; margin: 2rem auto; padding: 0 1rem; }
        h1 { font-size: 2.5rem; margin-bottom: 1.5rem; color: #003366; }
        h2 { font-size: 2rem; margin: 2rem 0 1rem; color: #0056b3; }
        h3 { font-size: 1.5rem; margin: 1.5rem 0 0.5rem; color: #007bff; }
        .btn { display: inline-block; padding: 0.8rem 1.5rem; background-color: #28a745; color: white; text-decoration: none; border-radius: 5px; margin: 0.5rem 0; font-weight: bold; }
        .btn:hover { background-color: #218838; }
        .download-btn { background-color: #dc3545; }
        .download-btn:hover { background-color: #c82333; }
        .login-btn { background-color: #007bff; }
        .login-btn:hover { background-color: #0069d9; }
        img { max-width: 100%; height: auto; margin: 1rem 0; border-radius: 8px; }
        .image-container { text-align: center; margin: 2rem 0; }
        .tags { margin: 2rem 0; }
        .tag { display: inline-block; background-color: #e9ecef; padding: 0.3rem 0.8rem; border-radius: 20px; margin-right: 0.5rem; margin-bottom: 0.5rem; }
        footer { background-color: #343a40; color: white; text-align: center; padding: 1.5rem; margin-top: 2rem; }
        footer a { color: #6c757d; text-decoration: none; }
        footer a:hover { color: white; }
        @media (max-width: 768px) {
            .mobile-menu-btn { display: block; }
            nav { display: none; flex-direction: column; align-items: center; background-color: rgba(0,51,102,0.9); position: absolute; top: 100%; left: 0; right: 0; padding: 1rem; }
            nav.active { display: flex; }
            nav a { margin: 0.5rem 0; }
            h1 { font-size: 2rem; }
            h2 { font-size: 1.75rem; }
        }