body {
    min-height: 100vh;
    margin: 0;
    display: flex;
    justify-content: center;
    align-items: center;
    background: linear-gradient(135deg, #6e3aff, #ff6b6b); 
}

.container {
    background: rgba(255, 255, 255, 0.15);
    backdrop-filter: blur(10px);
    height: 500px;
    width: 320px;
    border: 1px solid rgba(255, 255, 255, 0.3);
    border-radius: 20px;
    display: flex;
    flex-direction: column;
}

.screen {
    margin: 8px;
    padding: 8px;
    border: 1px solid rgba(255, 255, 255, 0.3);
    border-radius: 20px;
    background:rgba(255, 255, 255, 0.15);
    backdrop-filter: blur(5px);
    height: 150px;
    width: auto;
    color:white;
    font-size: 64px;
    display:flex;
    justify-content: flex-end;
    align-items: flex-end;
}

.buttons {
    display: grid; 
    grid-template-columns: repeat(4, 1fr);
    margin: 8px;
    flex: 1; 
}

button {
    background-color: rgba(255, 255, 255, 0.3);
    backdrop-filter: blur(2px);
    border: 1px solid rgba(255, 255, 255, 0.3);
    border-radius: 20px;
    margin: 3px;
    cursor: pointer; /* el cursor cambia al pasar por encima */
    font-size: 1.2rem;
    color: white;
}

.operator {
    border: 1px solid rgba(255, 255, 255, 0.5);
    border-radius: 40px;
}


.add {
    grid-row: span 2;
}

.equal {
    background-color: rgba(110, 58, 255, 0.7); /* morado principal del fondo */
    grid-column: span 2;
}

.delete {
    background-color: rgba(110, 58, 255, 0.3); /* morado más suave */
}