/* Decorative margins only: no effect or overlay over the central content. */
.margin-background {
  --rail: max(0px, calc((100vw - 1200px) / 2 - 53px));
  position: fixed;
  inset: 0;
  z-index: 1;
  pointer-events: none;
  opacity: .10;
  background: radial-gradient(circle, #7C3AED66 1px, transparent 1.5px) 0 0 / 7px 7px;
  -webkit-mask-image: linear-gradient(to right, #000 var(--rail), transparent var(--rail), transparent calc(100% - var(--rail)), #000 calc(100% - var(--rail)));
  mask-image: linear-gradient(to right, #000 var(--rail), transparent var(--rail), transparent calc(100% - var(--rail)), #000 calc(100% - var(--rail)));
}
.margin-background canvas { display: block; width: 100%; height: 100%; }
@media (max-width: 1306px) { .margin-background { display: none; } }
@media (forced-colors: active) { .margin-background { display: none; } }

/* Separate from the shader so the frame stays crisp. */
.margin-border-lines {
  position: fixed;
  top: 0;
  bottom: 0;
  left: max(0px, calc((100vw - 1200px) / 2 - 53px));
  right: max(0px, calc((100vw - 1200px) / 2 - 53px));
  z-index: 1;
  border-inline: 1px solid #FFFFFF24;
  pointer-events: none;
}
@media (max-width: 1306px), (forced-colors: active) {
  .margin-border-lines { display: none; }
}

@media (forced-colors: active) {
  .margin-background, .margin-border-lines { display: none; }
}