/* ---------------------------------------------------------------
   OBJECTS — structural, unstyled layout patterns.
   Layer 3 of 4. Swiss-grid discipline: strict columns, one scale.
   --------------------------------------------------------------- */

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

/* Narrow reading column, still anchored to the page's left grid line */
.o-container--narrow > * { max-width: var(--container-narrow); }

.o-section { padding-block: var(--section-y); }
.o-section--tight { padding-block: clamp(32px, 4.5vw, 56px); }

.o-band {
  background-color: var(--paper-tint);
  border-block: 1px solid var(--rule);
}

/* Strict column grids */
.o-grid {
  display: grid;
  gap: var(--s-5);
}

.o-grid--2 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.o-grid--3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }
.o-grid--4 { grid-template-columns: repeat(4, minmax(0, 1fr)); }

/* Editorial split: text column plus a figure column */
.o-split {
  display: grid;
  gap: clamp(var(--s-5), 4vw, var(--s-8));
  grid-template-columns: minmax(0, 1.15fr) minmax(0, 1fr);
  align-items: start;
}

.o-split--reverse > :first-child { order: 2; }

/* Vertical rhythm helper */
.o-stack > * + * { margin-top: var(--s-4); }
.o-stack--loose > * + * { margin-top: var(--s-6); }

.o-cluster {
  display: flex;
  flex-wrap: wrap;
  gap: var(--s-2);
  align-items: center;
}

.o-flow > * + * { margin-top: var(--s-5); }

.u-measure { max-width: var(--measure); }
.u-center { margin-inline: auto; }

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

@media (max-width: 900px) {
  .o-split { grid-template-columns: minmax(0, 1fr); }
  .o-split--reverse > :first-child { order: 0; }
  .o-grid--4 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .o-grid--3 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}

@media (max-width: 620px) {
  :root { --gutter: var(--s-4); }
  .o-grid--2,
  .o-grid--3,
  .o-grid--4 { grid-template-columns: minmax(0, 1fr); }
}