.sticky-header{position:fixed;top:0;left:0;right:0;z-index:50;background:hsla(0,0%,100%,.95);backdrop-filter:blur(10px);border-bottom:1px solid rgba(0,0,0,.1);transition:all .3s ease}.dark .sticky-header{background:rgba(15,23,42,.95);border-bottom:1px solid hsla(0,0%,100%,.1)}.sticky-header.visible{transform:translateY(0)}.sticky-header:not(.visible){transform:translateY(-100%)}