/* ==========================================================================
   Layout: containers, grids, sections, split layouts
   ========================================================================== */

.container {
  width: 100%;
  max-width: calc(var(--container) + var(--gutter) * 2);
  margin-inline: auto;
  padding-inline: var(--gutter);
}
.container--wide { max-width: calc(var(--container-wide) + var(--gutter) * 2); }
.container--narrow { max-width: calc(var(--container-narrow) + var(--gutter) * 2); }

/* ---------- Sections ---------- */
.section { padding-block: var(--section-y); position: relative; }
.section--tight { padding-block: calc(var(--section-y) * 0.6); }
.section--flush-top { padding-top: 0; }
.section--alt { background: var(--surface-alt); }
.section--ivory { background: var(--surface); }
.section--dark,
.on-dark {
  background: var(--color-chocolate);
  color: var(--text-on-dark);
}
.section--dark .lead, :is(.on-dark, .section--dark, .site-footer) .lead, :is(.on-dark, .section--dark, .site-footer) .muted { color: var(--text-on-dark-muted); }

.section-head {
  display: grid;
  gap: var(--space-4);
  max-width: 720px;
  margin-bottom: clamp(2.5rem, 2rem + 2vw, 4rem);
}
.section-head--center { margin-inline: auto; text-align: center; justify-items: center; }
.section-head--split {
  max-width: none;
  grid-template-columns: 1fr;
  align-items: end;
}
@media (min-width: 1024px) {
  .section-head--split { grid-template-columns: 1fr auto; gap: var(--space-6); }
}

/* ---------- Stack & cluster ---------- */
.stack { display: flex; flex-direction: column; gap: var(--stack-gap, var(--space-4)); }
.stack--sm { --stack-gap: var(--space-2); }
.stack--lg { --stack-gap: var(--space-6); }

.cluster { display: flex; flex-wrap: wrap; align-items: center; gap: var(--cluster-gap, var(--space-3)); }
.cluster--center { justify-content: center; }
.cluster--between { justify-content: space-between; }

/* ---------- Grids ---------- */
.grid { display: grid; gap: var(--grid-gap, clamp(1.25rem, 1rem + 1vw, 2rem)); }
.grid > * { min-width: 0; } /* long words can't force columns wider than the grid */

/* Auto-fill card grid: reflows naturally, never overflows */
.grid--cards { grid-template-columns: repeat(auto-fill, minmax(min(100%, var(--card-min, 280px)), 1fr)); }
.grid--2 { grid-template-columns: 1fr; }
/* Puppy listings: 1 → 2 → 3 → 4 columns (plans/03 §4) */
.grid--puppies { grid-template-columns: 1fr; }
@media (min-width: 480px) { .grid--puppies { grid-template-columns: repeat(2, 1fr); gap: 1rem; } }
@media (min-width: 1024px) { .grid--puppies { grid-template-columns: repeat(3, 1fr); gap: 2rem; } }
@media (min-width: 1536px) { .grid--puppies { grid-template-columns: repeat(4, 1fr); } }
.grid--3 { grid-template-columns: 1fr; }
.grid--4 { grid-template-columns: repeat(2, 1fr); }

@media (min-width: 768px) {
  .grid--2 { grid-template-columns: repeat(2, 1fr); }
  .grid--3 { grid-template-columns: repeat(2, 1fr); }
}
@media (min-width: 1024px) {
  .grid--3 { grid-template-columns: repeat(3, 1fr); }
  .grid--4 { grid-template-columns: repeat(4, 1fr); }
}

/* ---------- Split (image + text) ---------- */
.split {
  display: grid;
  gap: clamp(2.5rem, 1.5rem + 4vw, 6rem);
  align-items: center;
}
@media (min-width: 1024px) {
  .split { grid-template-columns: 1fr 1fr; }
  .split--5-7 { grid-template-columns: 5fr 7fr; }
  .split--7-5 { grid-template-columns: 7fr 5fr; }
  .split--reverse > :first-child { order: 2; }
  .split--top { align-items: start; }
}

/* ---------- Page body offset for fixed header ---------- */
.page-top { padding-top: calc(var(--header-h) + var(--announce-h)); }

main { display: block; }