* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'Roboto', sans-serif;
    background-color: #f4f7f6;
    display: flex;
    justify-content: center;
    align-items: center;
    height: 100vh;
    color: #333;
}

.container {
    background-color: #ffffff;
    padding: 30px;
    border-radius: 12px;
    box-shadow: 0 8px 20px rgba(0, 0, 0, 0.1);
    text-align: center;
    max-width: 400px;
    width: 100%;
}

h1 {
    font-size: 28px;
    margin-bottom: 10px;
    color: #333;
    font-weight: 500;
}

p {
    font-size: 16px;
    color: #555;
    margin-bottom: 20px;
}

.converter {
    display: flex;
    flex-direction: column;
    gap: 15px;
}

input, select, button {
    padding: 12px 15px;
    border-radius: 8px;
    border: 2px solid #ddd;
    font-size: 16px;
    transition: border-color 0.3s ease, box-shadow 0.3s ease;
    outline: none;
    background-color: #f9f9f9;
    color: #333;
}

input:focus, select:focus {
    border-color: #1a73e8;
    box-shadow: 0 0 5px rgba(26, 115, 232, 0.3);
}

select {
    appearance: none;
    background: url('data:image/svg+xml;base64,PHN2ZyBmaWxsPSIjY2NjIiB4bWxucz0iaHR0cDovL3d3dy53My5vcmcvMjAwMC9zdmciIHdpZHRoPSIxMCIgaGVpZ2h0PSIxMCIgdmlld0JveD0iMCAwIDEwIDEwIj4gPHBhdGggZD0iTTAgMmgxMGwtNSA1em0wNiA2aDJMNCAyTDAgOCIgLz48L3N2Zz4=') no-repeat right 12px center;
    background-size: 12px;
}

button {
    background-color: #1a73e8;
    color: white;
    font-weight: 500;
    border: none;
    cursor: pointer;
    transition: background-color 0.3s ease, box-shadow 0.3s ease;
}

button:disabled {
    background-color: #ccc;
    cursor: not-allowed;
}

button:not(:disabled):hover {
    background-color: #005cbf;
    box-shadow: 0 4px 10px rgba(0, 0, 0, 0.1);
}

button:not(:disabled):focus {
    box-shadow: 0 0 5px rgba(26, 115, 232, 0.5);
}

#resultMessage {
    margin-top: 20px;
    font-size: 18px;
    font-weight: bold;
    color: green;
}

input:valid {
    border-color: #4CAF50; /* Green */
}

input:invalid {
    border-color: #f44336; /* Red */
}
@media (max-width: 600px) {
    .container {
        padding: 20px;
        max-width: 90%;
    }

    h1 {
        font-size: 24px;
    }

    p {
        font-size: 14px;
    }

    input, select, button {
        font-size: 14px;
    }
}