/* Circuit background: a fixed canvas behind all content (z-index:-1), drawn by js/shared/components/circuit_background/.
   It only shows through areas without an opaque background: the hero, the header (also when scrolled), the footer, cards,
   forms and the dark bands stay opaque on purpose. For readability the mask lets the board stand fully at the edges and
   damps the middle of the content to 45 %. */
#circuitBg{position:fixed;left:0;top:0;width:100%;height:100vh;height:100lvh;z-index:-1;pointer-events:none;
  -webkit-mask-image:linear-gradient(90deg,#000 0,rgba(0,0,0,.45) 22%,rgba(0,0,0,.45) 78%,#000 100%);
  mask-image:linear-gradient(90deg,#000 0,rgba(0,0,0,.45) 22%,rgba(0,0,0,.45) 78%,#000 100%)}