/* ============================================================
   UX Software v.1.1 — Layout primitives
   ============================================================ */

.container {
  width: 100%;
  max-width: var(--container-max);
  margin: 0 auto;
  padding-left: var(--container-pad);
  padding-right: var(--container-pad);
}

.container--narrow { max-width: var(--container-narrow); }

.section {
  padding-block: var(--space-16);
  position: relative;
}

.section--tight  { padding-block: var(--space-10); }
.section--flush  { padding-block: 0; }
.section--alt    { background: var(--color-bg-elev); }

@media (max-width: 720px) {
  .section { padding-block: var(--space-12); }
}

.section-head {
  text-align: center;
  max-width: 760px;
  margin: 0 auto var(--space-12);
}

.section-head h2 {
  margin-bottom: var(--space-3);
}

.section-head p {
  font-size: var(--fs-md);
}

/* Grid presets */
.grid {
  display: grid;
  gap: var(--space-6);
}

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

@media (max-width: 960px) {
  .grid-3, .grid-4 { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 640px) {
  .grid-2, .grid-3, .grid-4 { grid-template-columns: 1fr; }
}

.row {
  display: flex;
  gap: var(--space-4);
  flex-wrap: wrap;
  align-items: center;
}

.row--between { justify-content: space-between; }
.row--center  { justify-content: center; }
.row--end     { justify-content: flex-end; }

.stack > * + * { margin-top: var(--space-4); }
.stack-sm > * + * { margin-top: var(--space-2); }
.stack-lg > * + * { margin-top: var(--space-6); }

.skip-link {
  position: absolute;
  left: -9999px;
  top: 0;
  padding: var(--space-3) var(--space-4);
  background: var(--color-accent-hi);
  color: var(--color-text);
  font-weight: var(--fw-semi);
  border-radius: 0 0 var(--radius-md) 0;
  z-index: 1100;
}
.skip-link:focus { left: 0; }