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

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

/* vertical rhythm */
.stack > * + * { margin-top: var(--flow, var(--sp-sm)); }
.stack-lg > * + * { margin-top: var(--sp-md); }

/* wrapping inline group */
.cluster {
  display: flex;
  flex-wrap: wrap;
  gap: var(--cluster-gap, var(--sp-sm));
  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(100%, var(--col, 16rem)), 1fr));
}

/* full-bleed band (safe: no 100vw) */
.bleed {
  width: 100%;
  margin-inline: calc(50% - 50vw);
  max-width: 100vw;
}

/* section rhythm */
.section { padding-block: clamp(3rem, 8vw, var(--sp-3xl)); }
.section--tight { padding-block: clamp(2.5rem, 6vw, var(--sp-2xl)); }

.section-head {
  max-width: 56ch;
  margin-bottom: clamp(2rem, 5vw, var(--sp-xl));
}
.section-head--center { margin-inline: auto; text-align: center; }

/* eyebrow / spec label — the monospaced signature device */
.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: var(--sp-2xs);
  font-family: var(--font-mono);
  font-size: var(--step--2);
  letter-spacing: var(--tracking-label);
  text-transform: uppercase;
  color: var(--c-accent-600);
  margin-bottom: var(--sp-sm);
}
.eyebrow::before {
  content: "";
  inline-size: 1.75rem;
  block-size: 2px;
  background: var(--c-accent);
}
.on-dark .eyebrow { color: var(--c-accent); }

.section-title {
  font-size: var(--step-4);
  letter-spacing: -0.02em;
}
.section-lead {
  margin-top: var(--sp-sm);
  max-width: 54ch;
  color: var(--c-muted);
  font-size: var(--step-1);
}

/* dark band */
.band-dark {
  background: var(--c-dark);
  color: var(--c-on-dark);
}
.band-dark h1, .band-dark h2, .band-dark h3 { color: var(--c-on-dark); }
.band-dark .section-lead { color: var(--c-on-dark-muted); }

/* blueprint dot/line grid texture — the engineering signature */
.blueprint {
  position: relative;
  background-color: var(--c-dark);
  background-image:
    linear-gradient(var(--c-dark-line) 1px, transparent 1px),
    linear-gradient(90deg, var(--c-dark-line) 1px, transparent 1px);
  background-size: 56px 56px;
}
.blueprint::after {
  content: "";
  position: absolute;
  inset: 0;
  background: radial-gradient(120% 90% at 80% 0%, transparent 30%, var(--c-dark) 100%);
  pointer-events: none;
}
.blueprint > * { position: relative; z-index: 1; }