/* 全屏遮罩 + 居中布局 */
#download-masking{
    position: fixed;
    inset: 0;
    z-index: 9999;

    background: rgb(0 0 0 / 35%);

    /* 居中白色矩形 */
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 24px;

    opacity: 0;
    visibility: hidden;
    pointer-events: none;

    transition: opacity 180ms ease;
}

/* 打开时显示 */
#download-masking.is-open{
    opacity: 1;
    visibility: visible;
    pointer-events: auto;

}

/* 中间白色矩形容器 */
#download-modal{
    box-sizing: border-box;
    display: flex;
    flex-direction: column;
    align-items: center;   /* 横向居中 */
    gap: 20px;             /* 组件之间的统一间距 */
    padding: 28px 32px;    /* 与边界空出距离 */
    background: #fff;
    border-radius: 5px;
    width: min(720px, 92vw);
    min-height: 360px;
    max-height: 80vh;
    overflow: auto;
    box-shadow: 0 20px 60px rgb(0 0 0 / 25%);
    --row-w: min(560px, 100%);

    transform: translateY(16px) scale(0.98);
    opacity: 0;

    transition: transform 180ms ease, opacity 180ms ease;
    will-change: transform, opacity;
}

#download-masking.is-open #download-modal{
    transform: translateY(0) scale(1);
    opacity: 1;
}

/* 减少动态效果：按系统偏好关闭/弱化动画 */
@media (prefers-reduced-motion: reduce){
    #download-masking,
    #download-modal{
        transition: none;
    }
}

#download-user-name{
    margin: 0;
    text-align: center;
}

#user-info-div{
    width: 100%;
    display: flex;
    justify-content: center;
    width: var(--row-w);
}

#user-info-div button {
    width: 100%;
    margin-top: 0;
    box-sizing: border-box;
    padding: 0.85rem 1rem;
    background-color: #ffffff;
    border: 1px solid #ff5252;
    font-size: 1.25rem;
    font-weight: 500;
    color: #ff5252;
    text-align: center;
    cursor: pointer;
    transition: background-color 0.2s ease, border-color 0.2s ease, color 0.2s ease, box-shadow 0.2s ease;
    line-height: 1.2;
}

/* 悬停：背景和边框加深，文字变白（增强对比） */
#user-info-div button:hover {
    background-color: #ff5252;       
    border-color: #ff5252;
    color: #ffffff;                  
}

/* 聚焦（键盘导航/点击时）：更深的背景，并添加深色光晕 */
#user-info-div button:focus {
    outline: none;
    box-shadow: 0 0 0 3px rgba(179, 241, 255, 0); /* 半透明深色外发光 */
}

/* 激活（鼠标按下时）：最深的黑色，模拟按下 */
#user-info-div button:active {
    background-color: #ff6e6e;
    border-color: #ff6e6e;
    color: #ffffff;
    transform: scale(0.98);          /* 轻微内缩 */
}

#download-options{
    width: 100%;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 12px;
}

.download-group{
    width: var(--row-w);
    display: flex;
    align-items: center;              /* 上下对齐 */ 
    justify-content: space-between;   /* 两端对齐 */
    gap: 24px;                        /* 固定间距兜底 */
}

.download-group label{
    flex: 1 1 auto;   /* 占剩余空间，让按钮贴右侧 */
    min-width: 0;
}

.download-group button {
    padding: 0.85rem 1rem;
    background-color: #ffffff;
    border: 1px solid #454545;
    font-size: 1.25rem;
    font-weight: 500;
    color: #000000;
    text-align: center;
    cursor: pointer;
    transition: background-color 0.2s ease, border-color 0.2s ease, color 0.2s ease, box-shadow 0.2s ease;
    margin-top: 0;
    line-height: 1.2;
    flex: 0 0 auto;
}

/* 悬停：背景和边框加深，文字变白（增强对比） */
.download-group button:hover {
    background-color: #3498db;       
    border-color: #3498db;
    color: #ffffff;                  
}

/* 聚焦（键盘导航/点击时）：更深的背景，并添加深色光晕 */
.download-group button:focus {
    outline: none;
    box-shadow: 0 0 0 3px rgba(179, 241, 255, 0); /* 半透明深色外发光 */
}

/* 激活（鼠标按下时）：最深的黑色，模拟按下 */
.download-group button:active {
    background-color: #87cfff;
    border-color: #87cfff;
    color: #ffffff;
    transform: scale(0.98);          /* 轻微内缩 */
}

.download-group label {
    font-size: 1.25rem;
}

.spinner {
    display: none;
    width: 16px;
    height: 16px;
    border: 2px solid #f3f3f3;      
    border-top: 2px solid #3498db;   
    border-radius: 50%;
    animation: spin 1s linear infinite;
    margin-left: 8px;
    vertical-align: middle;
}

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