/* ─────────────────────────────────────────────────────
   OSUS Layout System
   ───────────────────────────────────────────────────── */

/* ── Container ─────────────────────────────────────── */

.container {
  width: 100%;
  max-width: var(--container-2xl);
  margin-inline: auto;
  padding-inline: var(--container-padding);
}

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

.container--wide {
  max-width: var(--container-3xl);
}

/* ── Sections ──────────────────────────────────────── */

.section {
  padding-block: var(--section-py);
}

.section--lg {
  padding-block: var(--section-py-lg);
}

.section--dark {
  background-color: var(--navy);
  color: var(--text-on-dark);
}

.section--sage {
  background-color: var(--sage-10);
}

.section--warm {
  background-color: var(--warm-white-2);
}

/* ── Grid ──────────────────────────────────────────── */

.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); }

.grid--auto-fit-sm { grid-template-columns: repeat(auto-fit, minmax(240px, 1fr)); }
.grid--auto-fit-md { grid-template-columns: repeat(auto-fit, minmax(300px, 1fr)); }
.grid--auto-fit-lg { grid-template-columns: repeat(auto-fit, minmax(380px, 1fr)); }

/* ── Flex ──────────────────────────────────────────── */

.flex { display: flex; }
.flex-col { flex-direction: column; }
.flex-wrap { flex-wrap: wrap; }
.items-center { align-items: center; }
.items-start  { align-items: flex-start; }
.items-end    { align-items: flex-end; }
.justify-center  { justify-content: center; }
.justify-between { justify-content: space-between; }
.justify-start   { justify-content: flex-start; }
.justify-end     { justify-content: flex-end; }
.gap-2  { gap: var(--space-2); }
.gap-3  { gap: var(--space-3); }
.gap-4  { gap: var(--space-4); }
.gap-6  { gap: var(--space-6); }
.gap-8  { gap: var(--space-8); }
.gap-12 { gap: var(--space-12); }

/* ── Section Header ────────────────────────────────── */

.section-header {
  margin-bottom: clamp(2.5rem, 5vw, 4rem);
}

.section-header--center {
  text-align: center;
}

.section-header--center .section-subtitle {
  margin-inline: auto;
}

.section-header--center .section-eyebrow {
  justify-content: center;
}

/* ── Full bleed ─────────────────────────────────────── */

.full-bleed {
  width: 100vw;
  margin-inline: calc(-1 * var(--container-padding));
}

/* ── Aspect ratios ─────────────────────────────────── */

.aspect-video { aspect-ratio: 16 / 9; }
.aspect-square { aspect-ratio: 1; }
.aspect-4-3 { aspect-ratio: 4 / 3; }

/* ── Sticky ─────────────────────────────────────────── */

.sticky-top {
  position: sticky;
  top: var(--header-height);
}

/* ── Dividers ───────────────────────────────────────── */

.divider {
  border: none;
  border-top: 1px solid var(--border-color);
  margin-block: var(--space-8);
}

.divider--dark {
  border-color: var(--border-color-light);
}

/* ── Two-column layout ─────────────────────────────── */

.layout-split {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: clamp(2rem, 4vw, 5rem);
  align-items: center;
}

.layout-split--60-40 {
  grid-template-columns: 3fr 2fr;
}

.layout-split--40-60 {
  grid-template-columns: 2fr 3fr;
}

/* ── Responsive column utilities ───────────────────── */

@media (max-width: 1023px) {
  .grid--2,
  .grid--3,
  .grid--4,
  .layout-split,
  .layout-split--60-40,
  .layout-split--40-60 {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 767px) {
  .grid--auto-fit-lg {
    grid-template-columns: 1fr;
  }
}