/* Anchor targets land below the sticky header */
html {
  scroll-padding-top: var(--header-height);
}

/* Page background: accent glows scroll with the page, the grid stays fixed and fades out downwards */
body {
  position: relative;
  isolation: isolate;
}

body::before,
body::after {
  content: "";
  z-index: -1;
  pointer-events: none;
}

body::before {
  position: fixed;
  inset: 0;
  background-image:
    linear-gradient(var(--color-grid-line) 1px, transparent 1px),
    linear-gradient(90deg, var(--color-grid-line) 1px, transparent 1px);
  background-size: 64px 64px;
  opacity: 0.25;
  -webkit-mask-image: linear-gradient(to bottom, black, transparent 80%);
  mask-image: linear-gradient(to bottom, black, transparent 80%);
}

body::after {
  position: absolute;
  inset: 0;
  background:
    radial-gradient(circle at 75% 4%, rgb(var(--glow-rgb) / 0.09), transparent 28rem),
    radial-gradient(circle at 10% 34%, rgb(var(--glow-slate-rgb) / 0.06), transparent 25rem);
  opacity: var(--glow-opacity);
}

.container {
  width: min(100% - var(--container-gutter) * 2, var(--container-max));
  margin-inline: auto;
}

.section {
  padding-block: var(--space-section);
}

.section--bordered {
  border-top: var(--border-width) solid var(--color-line);
}

/* Hidden above the viewport until it receives keyboard focus */
.skip-link {
  position: absolute;
  top: var(--space-2xs);
  left: var(--space-2xs);
  z-index: 100;
  padding: var(--space-xs) var(--space-s);
  border-radius: var(--radius-s);
  background: var(--color-text);
  color: var(--color-bg);
  font-size: var(--text-s);
  font-weight: var(--font-weight-bold);
  transform: translateY(calc(-100% - var(--space-2xs) * 2));
}

.skip-link:focus {
  transform: none;
}