body {
    font-family: Arial, sans-serif;
    margin: 0;
    padding: 0;
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    background-color: #f0f0f0;
}

.container {
    background-color: white;
    padding: 20px;
    border-radius: 8px;
    box-shadow: 0 0 10px rgba(0,0,0,0.1);
    width: 90%;
    max-width: 400px;
}

h1 {
    text-align: center;
    color: #333;
}

.input-group {
    display: flex;
    margin-bottom: 20px;
}

input, button {
    font-size: 16px;
    padding: 10px;
}

input {
    flex-grow: 1;
    border: 1px solid #ddd;
    border-radius: 4px 0 0 4px;
}

button {
    background-color: #4CAF50;
    color: white;
    border: none;
    cursor: pointer;
    transition: background-color 0.3s;
}

button:hover {
    background-color: #45a049;
}

#generateBtn {
    border-radius: 0 4px 4px 0;
}

#downloadBtn {
    width: 100%;
    margin-top: 20px;
    border-radius: 4px;
}

.result {
    margin-top: 20px;
    word-break: break-all;
}

#qrcode img {
    display: block;
    margin: 0 auto;
    max-width: 100%;
    height: auto;
}

.hidden {
    display: none;
}

@media (max-width: 480px) {
    .container {
        width: 95%;
        padding: 15px;
    }

    h1 {
        font-size: 24px;
    }

    input, button {
        font-size: 14px;
        padding: 8px;
    }
}