/* ============================================
   2-LAYOUT.CSS
   
   Unified Grid and Container Systems
   - Main containers
   - Responsive grid patterns
   - Alignment utilities
   - Legacy layout compatibility
   ============================================ */

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

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

/* --- Consolidated Grid System --- */
.grid {
  display: grid;
  gap: var(--space-md);
  width: 100%;
}

/* Responsive Columns */
.grid-2 { grid-template-columns: 1fr; }
.grid-3 { grid-template-columns: 1fr; }
.grid-4 { grid-template-columns: 1fr; }

@media (min-width: 768px) {
  .grid-2 { grid-template-columns: repeat(2, 1fr); }
  .grid-3 { grid-template-columns: repeat(3, 1fr); }
  .grid-4 { grid-template-columns: repeat(2, 1fr); }
}

@media (min-width: 1024px) {
  .grid-4 { grid-template-columns: repeat(4, 1fr); }
}

/* Auto-Layout Patterns */
.grid-auto-fit {
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
}

.grid-auto-fill {
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
}

/* --- Alignment Utilities --- */
.grid-center { 
  place-items: center; 
}

.grid-gap-sm { gap: var(--space-sm); }
.grid-gap-md { gap: var(--space-md); }
.grid-gap-lg { gap: var(--space-lg); }
.grid-gap-xl { gap: var(--space-xl); }

/* --- Flexbox Utilities --- */
.flex {
  display: flex;
}

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

.flex-wrap {
  flex-wrap: wrap;
}

.items-center {
  align-items: center;
}

.items-start {
  align-items: flex-start;
}

.justify-center {
  justify-content: center;
}

.justify-between {
  justify-content: space-between;
}

/* --- Fixed Sidebar + Fluid Content Layout --- */
.layout-wrapper {
  display: flex;
  min-height: 100vh;
  width: 100%;
}

.block-left {
  display: none;
}

.block-right {
  flex: 1;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  width: 100%;
}

/* Mobile-first: Show top nav, hide fixed sidebar */
.nav-bar {
  display: flex;
}

/* --- Mobile Drawer (slide-in menu) --- */
.mobile-drawer {
  position: fixed;
  inset: 0;
  z-index: var(--z-modal);
  visibility: hidden;
  pointer-events: none;
}

.mobile-drawer--open {
  visibility: visible;
  pointer-events: auto;
}

.mobile-drawer__backdrop {
  position: absolute;
  inset: 0;
  background: rgba(var(--shadow-color), var(--alpha-50));
  opacity: 0;
  transition: opacity var(--duration-normal) var(--ease-out);
}

.mobile-drawer--open .mobile-drawer__backdrop {
  opacity: 1;
}

.mobile-drawer__content {
  position: absolute;
  top: 0;
  left: 0;
  width: min(80vw, 20rem);
  height: 100%;
  background: var(--color-bg);
  transform: translateX(-100%);
  transition: transform var(--duration-normal) var(--ease-out);
  overflow-y: auto;
}

.mobile-drawer--open .mobile-drawer__content {
  transform: translateX(0);
}

/* --- Desktop Layout (Fixed Sidebar + Fluid Content) ---
   Critical CSS for preventing FOUC (Flash of Unstyled Content)
*/
/* --- Main Content and Footer Spacing --- */
.content {
  flex: 1;
  padding: var(--space-xxl) var(--space-xl); /* More generous padding */
}

.site-footer {
  padding: var(--space-xl);
  margin-top: var(--space-xxl); /* More separation from content */
  border-top: 1px solid var(--color-border-light);
}

@media (max-width: 768px) {
  .content {
    padding: var(--space-lg) var(--space-md);
  }

  .site-footer {
    padding: var(--space-lg) var(--space-md);
  }
}

@media screen and (min-width: 60rem) {
  .layout-wrapper {
    flex-direction: row;
  }

  .block-left {
    display: flex;
    position: fixed;
    top: 0;
    left: 0;
    width: 20rem; /* Fixed 320px sidebar */
    height: 100vh;
    z-index: var(--z-sticky);
    overflow-y: auto;
  }

  .block-right {
    margin-left: 20rem;
    width: calc(100% - 20rem); /* Fluid content area */
    min-height: 100vh;
  }

  /* Hide mobile navigation on desktop - sidebar handles navigation */
  .mobile-nav,
  .nav-bar {
    display: none;
  }

  /* Mobile drawer not needed on desktop */
  .mobile-drawer {
    display: none;
  }
}

/* --- Content Columns (Two-column text layout) --- */
.content-columns {
  display: flex;
  gap: var(--space-lg);
  margin: var(--space-lg) 0;
}

.text-column {
  flex: 1;
}

.visual-column {
  flex: 1.5;
}

@media (max-width: 768px) {
  .content-columns {
    flex-direction: column;
  }
}

/* --- Frame Utility (Border box) --- */
.frame-p {
  border: 1px solid var(--color-border);
  padding: var(--space-md);
}

/* --- Print Styles --- */
@media print {
  /* Hide non-essential elements */
  .block-left,
  .mobile-nav,
  .nav-bar,
  .header, 
  .footer, 
  .post-nav, 
  .related-posts, 
  .sidebar,
  .mobile-drawer,
  .skip-link {
    display: none !important;
  }

  /* Reset layout for paper */
  .block-right,
  body, 
  .container, 
  .content {
    width: 100% !important;
    max-width: none !important;
    margin: 0 !important;
    padding: 0 !important;
    background: white !important;
    color: black !important;
  }

  /* Text readability */
  p, h1, h2, h3 {
    color: #000;
    page-break-inside: avoid;
    orphans: 3;
    widows: 3;
  }

  h1, h2, h3, h4 {
    page-break-after: avoid;
  }

  pre, blockquote, img, figure {
    page-break-inside: avoid;
  }

  /* Expand external links */
  a[href^="http"]::after {
    content: " (" attr(href) ")";
    font-size: 0.8em;
    color: #555;
  }

  /* Ensure links are visible */
  a {
    text-decoration: underline;
    color: #000;
  }
}