/* Paper grain — a single repeating noise tile applied as an overlay layer.
   Use .nk-grain on a full-bleed element; never on text containers. */
.nk-grain{position:relative}
.nk-grain::after{content:"";position:absolute;inset:0;pointer-events:none;opacity:.5;mix-blend-mode:multiply;background-image:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='140' height='140'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='.9' numOctaves='3'/%3E%3CfeColorMatrix type='saturate' values='0'/%3E%3C/filter%3E%3Crect width='140' height='140' filter='url(%23n)' opacity='.28'/%3E%3C/svg%3E")}