body {
    font-family: Arial, sans-serif;
    display: flex;
    justify-content: center;
    align-items: center;
    height: 100vh;
    background-color: #f4f4f4;
    margin: 0;
}

.container {
    background: white;
    padding: 16px;
    border-radius: 10px;
    box-shadow: 0 0 10px rgba(0, 0, 0, 0.1);
    text-align: center;
    width: 100%;
    max-width: 480px;
}

input {
    width: calc(100% - 32px);
    padding: 10px;
    margin-bottom: 16px;
    border: 1px solid #ddd;
    border-radius: 5px;
}

button {
    padding: 10px 15px;
    border: none;
    background-color: #007bff;
    color: white;
    border-radius: 5px;
    cursor: pointer;
}

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

#qr-container {
    margin: 20px 0;
    display: flex;
    justify-content: center;
    align-items: center;
}

#qr-container img {
    border: 1px solid #ddd;
    border-radius: 4px;
    padding: 8px;
    background-color: #fff;
}

#button-container {
    margin: 20px 0;
    width: 100%;
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 16px;
}

#button-container button {
    width: 40%;
}

#loader {
    border: 4px solid #f3f3f3;
    border-top: 4px solid #3498db;
    border-radius: 50%;
    width: 40px;
    height: 40px;
    animation: spin 1s linear infinite;
    margin: 20px auto;
}

@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}