/* ============================================================
   layout.css — S.C. Kincaid Author Website
   Containers, grid, spacing, structural utilities
   ============================================================ */

/* --- Container --- */
.container {
  width: 100%;
  max-width: var(--container-max);
  margin-left: auto;
  margin-right: auto;
  padding-left: var(--space-md);
  padding-right: var(--space-md);
}

.container--narrow {
  width: 100%;
  max-width: var(--container-narrow);
  margin-left: auto;
  margin-right: auto;
  padding-left: var(--space-md);
  padding-right: var(--space-md);
}

.container--medium {
  width: 100%;
  max-width: 960px;
  margin-left: auto;
  margin-right: auto;
  padding-left: var(--space-md);
  padding-right: var(--space-md);
}

/* --- Main content area offset for fixed nav --- */
main {
  padding-top: var(--nav-height);
}

/* --- Sections --- */
.section {
  padding-top: var(--space-xxl);
  padding-bottom: var(--space-xxl);
}

.section--sm {
  padding-top: var(--space-lg);
  padding-bottom: var(--space-lg);
}

.section--lg {
  padding-top: var(--space-hero);
  padding-bottom: var(--space-hero);
}

/* Background color variants */
.section--iron {
  background-color: var(--iron-dark);
}

.section--charcoal {
  background-color: var(--dusk-charcoal);
}

.section--black {
  background-color: var(--hollow-black);
}

/* --- Two-Column Grid --- */
.grid-2col {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-xl);
  align-items: start;
}

@media (min-width: 768px) {
  .grid-2col {
    grid-template-columns: 1fr 1fr;
  }

  .grid-2col--wide-left {
    grid-template-columns: 3fr 2fr;
  }

  .grid-2col--wide-right {
    grid-template-columns: 2fr 3fr;
  }
}

/* --- Flex Utilities --- */
.flex-center {
  display: flex;
  align-items: center;
  justify-content: center;
}

.flex-col {
  display: flex;
  flex-direction: column;
}

.flex-col-center {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
}

.flex-between {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

/* --- Spacing Utilities --- */
.mt-xs  { margin-top: var(--space-xs); }
.mt-sm  { margin-top: var(--space-sm); }
.mt-md  { margin-top: var(--space-md); }
.mt-lg  { margin-top: var(--space-lg); }
.mt-xl  { margin-top: var(--space-xl); }
.mt-xxl { margin-top: var(--space-xxl); }

.mb-xs  { margin-bottom: var(--space-xs); }
.mb-sm  { margin-bottom: var(--space-sm); }
.mb-md  { margin-bottom: var(--space-md); }
.mb-lg  { margin-bottom: var(--space-lg); }
.mb-xl  { margin-bottom: var(--space-xl); }
.mb-xxl { margin-bottom: var(--space-xxl); }

/* --- Text Alignment --- */
.text-center { text-align: center; }
.text-left   { text-align: left; }
.text-right  { text-align: right; }

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

/* --- Full Bleed --- */
.full-bleed {
  width: 100vw;
  margin-left: calc(50% - 50vw);
}

/* --- Aspect Ratio Boxes --- */
.aspect-2-3 {
  aspect-ratio: 2 / 3;
}

.aspect-4-3 {
  aspect-ratio: 4 / 3;
}

.aspect-16-9 {
  aspect-ratio: 16 / 9;
}

/* --- Page Header (for inner pages) --- */
.page-header {
  background: linear-gradient(
    to bottom,
    var(--predawn-blue),
    var(--dusk-charcoal)
  );
  padding: 80px 0 60px;
  text-align: center;
}

@media (min-width: 768px) {
  .page-header {
    padding: 100px 0 80px;
  }
}