body {
    font-family: Arial, sans-serif;
    background-color: #363649;
    margin: 0;
    padding: 0;
    display: flex;
    flex-direction: column;
    justify-content: flex-start;
    align-items: center;
    min-height: 100vh;
}

main {
    flex: 1;
}

footer {
    text-align: center;
    padding: 10px;
    background-color: #333;
    color: white;
    position: relative;
    bottom: 0;
    width: 100%;
    margin-top: auto;
}

h1 {
    color: #f6629d;
    margin-top: 0;
    text-align: center;
    font-family: Judge;
    font-weight: 500;
    font-size: 82px;
    letter-spacing: 0.1em;
}

.content-container {
    width: 100%;
    min-width: 300px;
    max-width: 440px;
    margin: auto;
}

.card-form-container {
    width: 100%;
    min-width: 300px;
    max-width: 400px;
    background: #fff;
    padding: 20px;
    border-radius: 8px;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
}

#cardNumber {
    font-family: monospace;
    letter-spacing: 0.6ch;
}

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

input[type="text"] {
    padding: 15px;
    border: 1px solid #ddd;
    border-radius: 4px;
    font-size: 16px;
}

input[type="text"]::placeholder {
    letter-spacing: normal;
}

input.invalid {
    border: 2px solid #e57373;
}

input[type="text"]:focus {
    border-color: #007bff;
    box-shadow: 0 0 0 2px rgba(0, 123, 255, 0.25);
    outline: none;
}

button {
    padding: 15px;
    border: none;
    border-radius: 4px;
    background-color: #16b4dc;
    color: white;
    font-size: 16px;
    cursor: pointer;
    transition: background-color 0.3s ease;
}

button:hover {
    background-color: #0056b3;
}

@media (max-width: 600px) {
    h1 {
        font-size: 76px;
    }
    .content-container, .card-form-container {
        margin: 5px;
        min-width: 250px;
        width: auto;
    }
}

@font-face {
    font-family: 'Judge';
    src: url('./F37Judge-RegularCompressed.woff2') format('woff2');
    font-weight: normal;
    font-style: normal;
}

@font-face {
    font-family: 'Judge';
    src: url('./F37Judge-BoldCondensed.woff2') format('woff2');
    font-weight: bold;
    font-style: normal;
}