body {
    font-family: Arial, Helvetica, sans-serif;
}
img.avatar {
    width: 40%;
    border-radius: 50%;
}
.qrform {
    padding: 25px;
    margin: 25px;
    box-shadow: 0 2px 5px #f5f5f5;
    background: #eee;
}
.close {
    color: #aaa;
    float: right;
    font-size: 28px;
    font-weight: bold;
}
.close:hover,
.close:focus {
    color: black;
    text-decoration: none;
    cursor: pointer;
}
input {
    padding: 10px;
    margin-bottom: 15px;
    border: 1px solid #ddd;
    border-radius: 8px;
    font-size: 14px;
    outline: none;
    transition: border-color 0.3s ease;
}
input:focus {
    border-color: #6a11cb;
}
button {
    padding: 12px;
    background: #6a11cb;
    color: #fff;
    border: none;
    border-radius: 8px;
    font-size: 16px;
    cursor: pointer;
    transition: background 0.3s ease;
}
button:hover {
    background: #2575fc;
}
.modal {
    display: none;
    position: fixed;
    z-index: 1000;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    overflow: auto;
    background-color: rgba(0,0,0,0.4);
    align-items: center;
    justify-content: center;
}
.modal-content {
    background-color: #fefefe;
    margin: auto;
    padding: 20px;
    border: 1px solid #888;
    width: 80%;
    max-width: 500px;
    border-radius: 8px;
    box-shadow: 0 4px 8px 0 rgba(0,0,0,0.2), 0 6px 20px 0 rgba(0,0,0,0.19);
    position: relative;
}
.close-button {
    color: #aaa;
    float: right;
    font-size: 28px;
    font-weight: bold;
    position: absolute; /* 相對於 modal-content 定位 */
    top: 10px;
    right: 15px;
    cursor: pointer;
}