/* ============================================================
   layout.css — layout primitives & page scaffolding
   ============================================================ */

.container {
  width: 100%;
  max-width: var(--container);
  margin-inline: auto;
  padding-inline: var(--gutter);
}
.container--wide   { max-width: var(--container-wide); }
.container--narrow { max-width: var(--container-narrow); }

/* Vertical rhythm */
.stack > * + * { margin-top: var(--flow, 1.25rem); }
.stack-sm > * + * { margin-top: var(--sp-xs); }
.stack-lg > * + * { margin-top: var(--sp-lg); }

/* Wrapping inline cluster */
.cluster {
  display: flex;
  flex-wrap: wrap;
  gap: var(--cluster-gap, 1rem);
  align-items: center;
}

/* Intrinsic auto grid */
.grid-auto {
  display: grid;
  gap: var(--grid-gap, var(--sp-md));
  grid-template-columns: repeat(auto-fit, minmax(min(var(--min, 260px), 100%), 1fr));
}

/* Section spacing */
.section { padding-block: var(--section-y); position: relative; }
.section--tight { padding-block: clamp(2.5rem, 6vw, 5rem); }
.section--flush-top { padding-top: 0; }

/* Coloured bands */
.band-paper   { background: var(--c-bg); }
.band-paper-2 { background: var(--c-bg-2); }
.band-lilac   { background: var(--c-brand-soft); }
.band-dark {
  background: var(--c-dark);
  color: var(--c-on-dark);
}
.band-dark h1, .band-dark h2, .band-dark h3, .band-dark h4 { color: var(--c-on-dark); }

/* Page shell */
main { display: block; }

/* Asymmetric split (hero, feature rows) */
.split {
  display: grid;
  gap: clamp(2rem, 5vw, 4.5rem);
  align-items: center;
}
@media (min-width: 880px) {
  .split { grid-template-columns: var(--split, 1.15fr .85fr); }
  .split--reverse > :first-child { order: 2; }
}

/* Section header block */
.section-head {
  display: grid;
  gap: var(--sp-sm);
  max-width: 60ch;
  margin-bottom: clamp(2rem, 5vw, 3.5rem);
}
.section-head--split {
  max-width: none;
  align-items: end;
}
@media (min-width: 880px) {
  .section-head--split {
    grid-template-columns: 1.4fr 1fr;
    gap: var(--sp-xl);
  }
}

/* Full-bleed escape hatch inside a contained parent */
.bleed {
  width: 100vw;
  margin-inline: calc(50% - 50vw);
}

[hidden] { display: none !important; }

.visually-hidden {
  position: absolute !important;
  width: 1px; height: 1px;
  padding: 0; margin: -1px;
  overflow: hidden; clip: rect(0 0 0 0);
  white-space: nowrap; border: 0;
}