/* ==========================================================================
   layout.css — Container, Grid, Utilities
   ========================================================================== */

/* --- Skip to content (accessibility) --- */
.skip-link {
  position: absolute;
  top: -100%;
  left: var(--space-4);
  z-index: var(--z-modal);
  padding: var(--space-3) var(--space-6);
  background: var(--color-ink);
  color: var(--color-surface);
  font-weight: 600;
  font-size: var(--font-body-sm);
  border-radius: 0 0 var(--radius-md) var(--radius-md);
  transition: top var(--duration-fast) var(--ease-default);
}

.skip-link:focus {
  top: 0;
  color: var(--color-surface);
}

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

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

/* --- Flow utility (vertical rhythm) --- */
.flow > * + * {
  margin-block-start: var(--flow-space, var(--space-6));
}

/* --- Section spacing --- */
.section {
  padding-block: var(--space-16);
}

.section--alt {
  background-color: var(--color-surface-alt);
}

/* --- Grid --- */
.grid {
  display: grid;
  gap: var(--grid-gap, var(--space-8));
}

.grid--2 {
  grid-template-columns: repeat(auto-fit, minmax(min(100%, 20rem), 1fr));
}

.grid--3 {
  grid-template-columns: repeat(auto-fit, minmax(min(100%, 16rem), 1fr));
}

/* --- Prose (long-form text) --- */
.prose {
  max-width: var(--container-narrow);
  margin-inline: auto;
}

.prose > * + * {
  margin-block-start: var(--space-6);
}

.prose h2 {
  margin-block-start: var(--space-12);
}

.prose h3 {
  margin-block-start: var(--space-8);
}

.prose ul,
.prose ol {
  padding-inline-start: var(--space-6);
}

.prose li + li {
  margin-block-start: var(--space-2);
}

/* --- Accessibility utility --- */
.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;
}

/* --- Text utilities --- */
.text-center { text-align: center; }
.text-muted  { color: var(--color-ink-muted); }
.text-sm     { font-size: var(--font-body-sm); }
.text-lg     { font-size: var(--font-body-lg); }

/* --- Responsive: Site Layout --- */
.site {
  display: flex;
  flex-direction: column;
  min-height: 100vh;
}

.site-main {
  flex: 1;
}