body {
    background: linear-gradient(135deg, #d63434, #ffffff);
    font-family: 'Segoe UI', sans-serif;
    display: flex;
    justify-content: center;
    align-items: center;
    height: 100vh;
}

table {
    background-color: #ffffff;
    border-collapse: collapse;
    border-radius: 15px;
    box-shadow: 0 8px 20px rgba(0, 0, 0, 0.2);
    overflow: hidden;
    padding: 15px;
}

h2 {
    text-align: center;
    color: white;
    position: absolute;
    top: 40px;
    font-size: 28px;
    letter-spacing: 1px;
}

input[type="text"] {
    width: 100%;
    height: 60px;
    font-size: 22px;
    text-align: right;
    border: none;
    outline: none;
    background-color: #f0f4f7;
    border-radius: 10px;
    padding: 10px;
}

button {
    width: 70px;
    height: 60px;
    font-size: 20px;
    font-weight: bold;
    border: none;
    border-radius: 10px;
    background-color: #e0e6ed;
    cursor: pointer;
    transition: 0.3s;
}

button:hover {
    background-color: #b3c7f9;
    transform: scale(1.05);
}

button:active {
    background-color: #90a7e0;
    transform: scale(1);
}

td {
    padding: 5px;
    text-align: center;
}

button[onclick*="borrar"] {
    background-color: #f76c6c;
    color: white;
    font-size: 22px;
}

button[onclick*="borrar"]:hover {
    background-color: #ff4d4d;
}

button[onclick*="calcular"] {
    background-color: #4caf50;
    color: white;
}

button[onclick*="calcular"]:hover {
    background-color: #3e8e41;
}