@import url('https://fonts.googleapis.com/css2?family=Red+Hat+Display:wght@300;400;500;600;700;800;900&display=swap');

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Red Hat Display', sans-serif;
}

body {
    font-family: 'Arial', sans-serif;
    background: linear-gradient(to left, #0064af, #00205c);
    background-size: 200% 200%;
    animation: girarDegradado 5s ease infinite;
    margin: 0;
    padding: 0;
    display: flex;
    justify-content: center;
    align-items: center;
    height: 100vh;
    min-height: 100vh;
    box-sizing: border-box;
    flex-direction: column;
}

@keyframes girarDegradado {
    0% {
        background-position: 0% 50%;
    }
    50% {
        background-position: 100% 50%;
    }
    100% {
        background-position: 0% 50%;
    }
}

h1 {
    font-size: 2.5rem;
    color: #ffffff;
    text-align: center;
    margin-bottom: 20px;
    padding: 0 15px;
}

form {
    background-color: #ffffff;
    padding: 20px;
    border-radius: 8px;
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.1);
    width: 100%;
    max-width: 600px;
    margin: 0 20px;
    display: flex;
    flex-direction: column;
    gap: 15px;
}

img {
    width: 10%;
    position: absolute;
    left: 3%;
    top: 0px;
}

label {
    font-size: 1.1rem;
    margin-bottom: 8px;
    display: block;
    color: #2c3e50;
}

input[type="number"] {
    width: 100%;
    padding: 10px;
    font-size: 1rem;
    margin-bottom: 15px;
    border: 1px solid #ccc;
    border-radius: 4px;
    box-sizing: border-box;
    background-color: #f9f9f9;
    transition: border 0.3s ease-in-out;
}

input[type="number"]:focus {
    border: 1px solid #3498db;
    outline: none;
}

button {
    background-color: #3498db;
    color: white;
    padding: 12px 25px;
    border: none;
    border-radius: 4px;
    cursor: pointer;
    font-size: 1rem;
    transition: background-color 0.3s;
    width: 100%;
}

button:hover {
    background-color: #2980b9;
}

button:focus {
    outline: none;
}

.result {
    background-color: #ffffff;
    padding: 20px;
    border-radius: 8px;
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.1);
    margin-top: 20px;
    width: 100%;
    max-width: 600px;
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.result p {
    font-size: 1.1rem;
    margin: 0;
}

.result span {
    font-weight: bold;
    color: #3498db;
}

input:invalid {
    border: 1px solid red;
}

input:valid {
    border: 1px solid green;
}

@media (max-width: 768px) {
    h1 {
        font-size: 2rem;
    }

    form {
        padding: 15px;
        width: 80%;
    }

    .result {
    width: 80%;
    }

    label {
        font-size: 1rem;
    }

    input[type="number"], button {
        font-size: 0.9rem;
        padding: 8px;
    }

    button {
        padding: 10px 20px;
    }
}

@media (max-width: 480px) {
    h1 {
        font-size: 1.5rem;
        padding: 0 10px;
    }

    form {
        padding: 10px;
        width: 80%;
    }

    .result {
    width: 80%;
    }

    label {
        font-size: 0.9rem;
    }

    input[type="number"], button {
        font-size: 0.9rem;
        padding: 8px;
    }

    button {
        padding: 10px 15px;
    }
}