/* ==========================================================================
   layout.css — PAGE STRUCTURE
   Container width, main area, footer and accessibility helpers.
   ========================================================================== */

/* Centered content wrapper used inside header, sections and footer */
.container {
  width: 100%;
  max-width: var(--max-width-content);
  margin-inline: auto;
  padding-inline: var(--page-gutter);
}

/* <main id="main-content"> */
.site-main {
  display: block;
  min-height: calc(100vh - var(--header-height));
  padding-block: var(--space-xl) var(--section-spacing);
}

/* "Skip to content" link — visible only when focused with keyboard */
.skip-link {
  position: absolute;
  top: var(--space-xs);
  left: var(--space-xs);
  z-index: calc(var(--z-header) + 1);
  padding: var(--space-xs) var(--space-md);
  background: var(--color-bg-surface);
  color: var(--color-text-primary);
  border-radius: var(--radius-sm);
  transform: translateY(-200%);
  transition: transform var(--transition-fast);
}

.skip-link:focus {
  transform: translateY(0);
}

/* Hide visually but keep readable for screen readers and search engines */
.visually-hidden {
  position: absolute !important;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

/* --------------------------------------------------------------------------
   FOOTER  —  <footer id="site-footer">
   -------------------------------------------------------------------------- */
#site-footer {
  background: var(--color-bg-secondary);
  border-top: var(--border-width) solid var(--color-border-subtle);
  box-shadow: inset 0 1px 0 color-mix(in srgb, var(--color-accent-primary) 28%, transparent);
  padding-block: var(--space-lg);
  font-size: var(--font-size-sm);
}

.footer-inner {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: var(--space-xs);
}

.footer-brand {
  font-size: var(--font-size-lg);
  font-weight: var(--font-weight-bold);
  letter-spacing: var(--letter-spacing-heading);
  color: var(--color-text-primary);
  text-decoration: none;
}

.footer-brand:hover,
.footer-brand:focus-visible {
  text-decoration: none;
}

.footer-menu {
  display: flex;
  flex-wrap: wrap;
  max-width: 100%;
  gap: 0 var(--space-md);
}

.footer-link {
  display: inline-flex;
  align-items: center;
  min-height: var(--button-min-height);
  color: var(--color-text-secondary);
  text-decoration: none;
}

.footer-link:hover,
.footer-link:focus-visible,
.footer-link[aria-current="page"] {
  color: var(--color-text-primary);
  text-decoration: underline;
  text-underline-offset: 0.18em;
}

.footer-copyright {
  color: var(--color-text-muted);
}