/* ==========================================================================
   LAYOUT — page frame, camera guides, containers, section furniture
   ========================================================================== */

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

.container--wide { width: min(100% - (var(--frame) * 4), 120rem); }

.section {
  position: relative;
  padding-block: var(--bay);
}

.section[id],
[id] { scroll-margin-block-start: clamp(5.5rem, 13vh, 8rem); }

.section + .section { border-block-start: var(--rule) solid var(--line-soft); }

/* --- Section header ----------------------------------------------------- */

.section-head {
  display: grid;
  gap: clamp(1rem, 2.5vw, 2rem);
  grid-template-columns: minmax(0, 1fr);
  margin-block-end: clamp(2.5rem, 6vw, 5rem);
}

@media (min-width: 60rem) {
  .section-head { grid-template-columns: minmax(0, 1.15fr) minmax(0, 1fr); align-items: end; }
}

.section-label {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  color: var(--lime);
  margin-block-end: clamp(1rem, 3vw, 2rem);
}

.section-label::before {
  content: '';
  inline-size: clamp(1.5rem, 5vw, 4rem);
  block-size: var(--rule);
  background: currentColor;
}

.section-label__idx { color: var(--ash-dim); }

.section-title {
  font-size: var(--step-4);
  --wdth: 118;
  --wght: 850;
  text-transform: uppercase;
}

/* --- Page frame + camera guides ---------------------------------------- */

.frame {
  position: fixed;
  inset: var(--frame);
  z-index: 90;
  pointer-events: none;
  border: var(--rule) solid var(--line-soft);
  mix-blend-mode: screen;
}

.frame__mark {
  position: absolute;
  inline-size: 0.85rem;
  block-size: 0.85rem;
  border: 0 solid var(--lime);
  opacity: 0.75;
}
.frame__mark--tl { inset-block-start: -1px; inset-inline-start: -1px; border-block-start-width: 2px; border-inline-start-width: 2px; }
.frame__mark--tr { inset-block-start: -1px; inset-inline-end: -1px;   border-block-start-width: 2px; border-inline-end-width: 2px; }
.frame__mark--bl { inset-block-end: -1px;   inset-inline-start: -1px; border-block-end-width: 2px;   border-inline-start-width: 2px; }
.frame__mark--br { inset-block-end: -1px;   inset-inline-end: -1px;   border-block-end-width: 2px;   border-inline-end-width: 2px; }

/* Film grain + scanlines sit above everything but the chrome. */
.grain {
  position: fixed;
  inset: -50%;
  z-index: 95;
  pointer-events: none;
  opacity: 0.22;
  background-image: var(--grain-src);
  background-size: 180px 180px;
  mix-blend-mode: overlay;
  will-change: transform;
}

.scanlines {
  position: fixed;
  inset: 0;
  z-index: 94;
  pointer-events: none;
  opacity: 0.16;
  background: repeating-linear-gradient(
    to bottom,
    transparent 0 2px,
    rgb(0 0 0 / 0.5) 2px 4px
  );
  mix-blend-mode: multiply;
}

/* Hairline field grid, like a framing guide in a camera viewfinder. */
.guides {
  position: fixed;
  inset: 0;
  z-index: 1;
  pointer-events: none;
  opacity: 0.55;
  background-image:
    linear-gradient(to right, var(--line-soft) var(--rule), transparent var(--rule));
  background-size: calc(100% / 6) 100%;
  mask-image: linear-gradient(to bottom, transparent, black 18%, black 82%, transparent);
}

@media (max-width: 48rem) {
  .guides { background-size: calc(100% / 3) 100%; }
}

/* --- Shell -------------------------------------------------------------- */

.shell {
  position: relative;
  z-index: 2;
}

.bleed {
  position: relative;
  width: 100vw;
  margin-inline: calc(50% - 50vw);
}

.split {
  display: grid;
  gap: clamp(1.5rem, 4vw, 3.5rem);
  grid-template-columns: minmax(0, 1fr);
}

@media (min-width: 55rem) {
  .split--2 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}