body {
            font-family: Arial, sans-serif;
            text-align: center;
            background-color: #f4f4f4;
            padding: 20px;
        }

        section {
            background: white;
            border: 1px solid #ddd;
            padding: 20px;
            margin-bottom: 30px;
            border-radius: 8px;
            max-width: 600px;
            margin-left: auto;
            margin-right: auto;
        }

        h2 { color: #333; }
        
        /* Estilos Parte 1: Imagen y borde */
        .imagen-principal {
            width: 200px;
            cursor: pointer;
            border-radius: 10px;
            transition: 0.2s;
        }

        /* Clase para el borde rojo de 2px solicitado */
        .borde-rojo {
            border: 2px solid red;
        }

        /* Estilos Parte 2: Stickers */
        .sticker-container {
            display: flex;
            justify-content: space-around;
            margin-bottom: 15px;
        }
        .sticker-item {
            display: flex;
            flex-direction: column;
            align-items: center;
        }
        .sticker-img {
            width: 80px;
            height: 80px;
            object-fit: cover;
            margin-bottom: 5px;
        }
        input[type="number"] {
            width: 50px;
            text-align: center;
        }

        /* Estilos Parte 3: Password */
        select {
            font-size: 18px;
            padding: 5px;
            margin: 0 5px;
        }
        
        button {
            background-color: #007bff;
            color: white;
            border: none;
            padding: 10px 20px;
            border-radius: 5px;
            cursor: pointer;
            font-size: 16px;
            margin-top: 10px;
        }
        button:hover { background-color: #0056b3; }

        .resultado {
            font-weight: bold;
            margin-top: 15px;
            color: #444;
        }