/* Without enhancement every row remains readable, in normal document flow. */
[data-blocks-header-slot] { display: flow-root; }
[data-blocks-header-active] { position: relative; overflow: visible; }
[data-blocks-header-active] > [data-blocks-header-slot] { position: relative; box-sizing: border-box; }
[data-blocks-header-active] [data-blocks-header-row] {
    box-sizing: border-box;
    margin: 0;
    overflow: visible;
}
[data-blocks-header-active] [data-header-visible="0"] { display: none !important; }
/* Menu boundary classes may raise a row, but cannot change its placement. */
[data-blocks-header-active] [data-blocks-header-row][data-header-placement="fixed"] { position: fixed; }
[data-blocks-header-active] [data-blocks-header-row][data-header-placement="absolute"] { position: absolute; }
[data-blocks-header-active] [data-blocks-header-row][data-header-placement="flow"] { position: relative; }
html[data-blocks-header-clearance] { scroll-padding-top: var(--blocks-header-clearance, 0px); }
@media (prefers-reduced-motion: reduce) {
    [data-blocks-header-row] { transition: none !important; animation: none !important; }
}