.scrolling { backdrop-filter: blur(20px); will-change: backdrop-filter, transform; transition: backdrop-filter 0.4s ease, background-color 0.4s ease; background-color: rgba(255,255,255,0.5);  } .header-container { transition: padding 0.35s cubic-bezier(0.25, 0.1, 0.25, 1), transform 0.35s cubic-bezier(0.25, 0.1, 0.25, 1), opacity 0.35s ease; }