* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}
body {
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    padding: 16px;
    background-image: url("https://m.ccw.site/creator-college/images/f2f989260741ef84416f2cafb0429c9d.jpg");
    background-size: cover;
    background-position: center;
    background-repeat: no-repeat;
    background-attachment: fixed;
    position: relative;
}
body::before {
    content: "";
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.7);
    backdrop-filter: blur(15px);
    z-index: -1;
}
.wrap {
    width: 100%;
    max-width: 520px;
    background: rgba(50, 50, 50, 0.7);
    padding: 24px;
    border-radius: 10px;
    backdrop-filter: blur(15px);
    z-index: 1;
}
h2 {
    color: #eee;
    text-align: center;
    margin-bottom: 20px;
    font-size: 18px;
    font-weight: normal;
}
.row {
    margin-bottom: 14px;
}
label {
    display: block;
    color: #b9b9bd;
    font-size: 13px;
    margin-bottom: 5px;
}
input {
    width: 100%;
    background: #3c3c40;
    border: 1px solid #555;
    color: #fff;
    padding: 10px 12px;
    border-radius: 4px;
    font-size: 14px;
    outline: none;
}
input:focus {
    border-color: #6398e8;
}
#downloadBtn {
    width: 100%;
    padding: 11px;
    border: none;
    border-radius: 4px;
    background: #446cad;
    color: #fff;
    font-size: 14px;
    cursor: pointer;
}
#downloadBtn:disabled {
    background: #546b8c;
    cursor: default;
}
#tip {
    margin-top: 12px;
    font-size: 13px;
    min-height: 15px;
}
.success {
    color: #5cd075;
}
.error {
    color: #ff6b6b;
}
footer {
    width: 100%;
    max-width: 520px;
    margin-top: 20px;
    padding: 12px 16px;
    color: #a4a4a4;
    font-size: 11px;
    line-height: 1.6;
    text-align: center;
}