.header{position:sticky;top:0;z-index:30;background:rgba(0,0,0,var(--header-alpha,1));-webkit-backdrop-filter:blur(12px);backdrop-filter:blur(12px)}
.mobile-nav{position:fixed;top:var(--header-height,100px);left:0;right:0;z-index:29;max-height:calc(100dvh - var(--header-height,100px));overflow-y:auto;background:rgba(0,0,0,.94);-webkit-backdrop-filter:blur(12px);backdrop-filter:blur(12px)}
html{scroll-padding-top:calc(var(--header-height,100px) + 12px)}