/* MyExplorer 图标系统 — 使用真实 png 图标 */
.fi {
    display: inline-block;
    width: 32px; height: 32px;
    border: none;
    background: transparent;
    vertical-align: middle;
    object-fit: contain;
    user-select: none;
    flex: 0 0 auto;
}
.fi.sm { width: 22px; height: 22px; }
.fi.lg { width: 48px; height: 48px; }
/* 桌面/大视图里的图标稍大 */
.view-icons .item .fi { width: 44px; height: 44px; }
.desktop-icon .fi { width: 46px; height: 46px; }
.win-title .fi { width: 22px; height: 22px; }