// ============================================================================
// Layout Shell — Adaptive layout container
// Per CUB-27 spec breakpoints:
//   Compact  (0–599px):  Header + Content + Bottom Nav (stacked)
//   Medium   (600–1023px): Collapsed Nav Rail + Header + Content
//   Expanded (≥1024px):  Expandable Nav Rail + Header + Content
// ============================================================================

.layout-shell {
  display: flex;
  min-height: 100vh;
  background-color: var(--cc-background);
}

.layout-shell__nav-rail {
  flex-shrink: 0;
}

.layout-shell__main {
  flex: 1;
  display: flex;
  flex-direction: column;
  min-width: 0; // Prevent flex overflow
  overflow: hidden;
}

.layout-shell__header {
  flex-shrink: 0;
}

.layout-shell__content {
  flex: 1;
  overflow-y: auto;
  overflow-x: hidden;
  padding: var(--cc-section-padding);
}

.layout-shell__bottom-nav {
  flex-shrink: 0;
}

// ---------------------------------------------------------------------------
// Compact (0–599px): Stack layout vertically, bottom nav visible
// ---------------------------------------------------------------------------
@media (max-width: 599px) {
  .layout-shell {
    flex-direction: column;
  }

  .layout-shell__content {
    padding: var(--cc-section-padding-compact);
    // Account for bottom nav bar height
    padding-bottom: calc(var(--cc-bottom-nav-height) + 16px);
  }
}

// ---------------------------------------------------------------------------
// Medium (600–1023px): Sidebar + content, collapsed nav rail
// ---------------------------------------------------------------------------
@media (min-width: 600px) and (max-width: 1023px) {
  .layout-shell__content {
    padding: 20px;
  }
}

// ---------------------------------------------------------------------------
// Expanded (≥1024px): Full nav rail with expandable behavior
// ---------------------------------------------------------------------------
@media (min-width: 1024px) {
  .layout-shell__content {
    padding: var(--cc-section-padding);
  }
}