/* Purpose: Containers, grid primitives, and section rhythm. */

.container {
  width: 100%;
  max-width: var(--container-xl);
  margin-inline: auto;
  padding-inline: var(--gutter);
  position: relative;
  z-index: var(--z-raised);
}

.container--wide   { max-width: var(--container-2xl); }
.container--narrow { max-width: var(--container-lg); }

.section {
  position: relative;
  padding-block: var(--space-20);
  isolation: isolate;
}

@media (min-width: 768px)  { .section { padding-block: var(--space-24); } }
@media (min-width: 1025px) { .section { padding-block: var(--space-32); } }

.section--tight { padding-block: var(--space-16); }

/* Hairline divider between stacked sections. */
.section + .section::before {
  content: '';
  position: absolute;
  inset-inline: 0;
  top: 0;
  height: 1px;
  background: var(--gradient-rule);
  opacity: 0.28;
}

/* Deliberate light break - reads as printed paper against the black-tie ground. */
.section--alt,
.section--warm {
  background-color: var(--color-paper);
  color: var(--color-text-onpaper);
}
.section--alt::before, .section--warm::before { display: none; }
.section--warm { background-color: var(--color-paper-alt); }

.section--alt h1, .section--alt h2, .section--alt h3, .section--alt h4,
.section--warm h1, .section--warm h2, .section--warm h3, .section--warm h4 {
  color: var(--color-text-onpaper);
}

.section--dark { background-color: var(--color-bg-alt); }

/* Warm radial bloom behind feature sections. */
.section--glow::after {
  content: '';
  position: absolute;
  left: 50%;
  top: -10%;
  width: min(1100px, 120vw);
  aspect-ratio: 1;
  transform: translateX(-50%);
  background: radial-gradient(circle, rgba(255,145,75,0.14) 0%, rgba(255,145,75,0.05) 38%, transparent 68%);
  pointer-events: none;
  z-index: -1;
}

.grid { display: grid; gap: var(--grid-gap); }
.grid--2, .grid--3, .grid--4 { grid-template-columns: 1fr; }

@media (min-width: 768px) {
  .grid--2 { grid-template-columns: repeat(2, 1fr); }
  .grid--3 { grid-template-columns: repeat(2, 1fr); }
  .grid--4 { grid-template-columns: repeat(2, 1fr); }
}

@media (min-width: 1025px) {
  .grid--3 { grid-template-columns: repeat(3, 1fr); }
  .grid--4 { grid-template-columns: repeat(4, 1fr); }
}

.stack > * + * { margin-top: var(--space-4); }
.center { text-align: center; }
.center-x { margin-inline: auto; }

/* Anchor targets must clear the fixed header. */
[id] { scroll-margin-top: 110px; }