/*
 * FoundContext v4 Layout Styles
 * Page layout, header, footer, and navigation components
 */

/* Main layout structure */
.site-header {
  position: sticky;
  top: 0;
  z-index: var(--z-sticky);
  background-color: var(--background-overlay);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--border-color);
  height: var(--header-height);
}

.main-content {
  min-height: calc(100vh - var(--header-height) - 200px); /* Account for footer */
  padding: var(--space-md) 0;
}

.site-footer {
  background-color: var(--background-secondary);
  border-top: 1px solid var(--border-color);
  margin-top: var(--space-3xl);
  padding: var(--space-2xl) 0 var(--space-xl);
}

/* Header Navigation */
.nav-container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 100%;
  max-width: var(--max-width-container);
  margin: 0 auto;
  padding: 0 var(--space-md);
}

.nav-brand {
  display: flex;
  align-items: center;
}

.brand-link {
  font-size: var(--font-size-xl);
  font-weight: var(--font-weight-bold);
  color: var(--primary-color);
  text-decoration: none;
}

.brand-link:hover,
.brand-link:focus {
  color: var(--primary-color-dark);
  text-decoration: none;
}

/* Mobile Navigation */
.menu-toggle {
  display: flex;
  flex-direction: column;
  justify-content: center;
  width: var(--touch-target-min);
  height: var(--touch-target-min);
  background: none;
  border: none;
  cursor: pointer;
  padding: var(--space-sm);
}

.hamburger-icon {
  display: flex;
  flex-direction: column;
  width: 24px;
  height: 18px;
  justify-content: space-between;
}

.hamburger-icon span {
  display: block;
  height: 2px;
  width: 100%;
  background-color: var(--text-color);
  border-radius: 1px;
  transition: all var(--animation-duration-normal) var(--animation-easing);
}

.menu-toggle[aria-expanded="true"] .hamburger-icon span:first-child {
  transform: rotate(45deg) translate(6px, 6px);
}

.menu-toggle[aria-expanded="true"] .hamburger-icon span:nth-child(2) {
  opacity: 0;
}

.menu-toggle[aria-expanded="true"] .hamburger-icon span:last-child {
  transform: rotate(-45deg) translate(6px, -6px);
}

/* Navigation Menu */
.nav-menu {
  display: flex;
  align-items: center;
  gap: var(--space-lg);
}

.nav-list {
  display: flex;
  align-items: center;
  gap: var(--space-lg);
  list-style: none;
  margin: 0;
  padding: 0;
}

.nav-link {
  display: flex;
  align-items: center;
  padding: var(--space-sm) var(--space-md);
  font-size: var(--font-size-base);
  font-weight: var(--font-weight-medium);
  color: var(--text-color);
  text-decoration: none;
  border-radius: var(--radius-md);
  transition: all var(--animation-duration-fast) var(--animation-easing);
  min-height: var(--touch-target-min);
}

.nav-link:hover,
.nav-link:focus {
  background-color: var(--background-secondary);
  color: var(--primary-color);
  text-decoration: none;
}

.nav-link.active {
  background-color: var(--primary-color-alpha);
  color: var(--primary-color);
  font-weight: var(--font-weight-semibold);
}

/* Navigation Controls */
.nav-controls {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
}

.theme-toggle,
.motion-toggle {
  display: flex;
  align-items: center;
  justify-content: center;
  width: var(--touch-target-min);
  height: var(--touch-target-min);
  background: none;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: all var(--animation-duration-fast) var(--animation-easing);
}

.theme-toggle:hover,
.motion-toggle:hover,
.theme-toggle:focus,
.motion-toggle:focus {
  background-color: var(--background-secondary);
  border-color: var(--primary-color);
}

.theme-icon,
.motion-icon {
  font-size: var(--font-size-lg);
}

/* Deck Index Drawer (Desktop) */
.deck-index-drawer {
  position: fixed;
  top: var(--header-height);
  left: -var(--nav-drawer-width);
  width: var(--nav-drawer-width);
  height: calc(100vh - var(--header-height));
  background-color: var(--background-overlay);
  backdrop-filter: blur(10px);
  border-right: 1px solid var(--border-color);
  transition: left var(--animation-duration-normal) var(--animation-easing);
  z-index: var(--z-fixed);
  overflow-y: auto;
}

.deck-index-drawer.open {
  left: 0;
}

.drawer-content {
  padding: var(--space-lg);
}

.drawer-title {
  font-size: var(--font-size-lg);
  font-weight: var(--font-weight-semibold);
  margin-bottom: var(--space-md);
  color: var(--text-color);
  border-bottom: 1px solid var(--border-color);
  padding-bottom: var(--space-sm);
}

/* Footer */
.footer-content {
  max-width: var(--max-width-container);
  margin: 0 auto;
  padding: 0 var(--space-md);
  display: grid;
  gap: var(--space-xl);
}

.footer-section {
  text-align: center;
}

.footer-title {
  font-size: var(--font-size-lg);
  font-weight: var(--font-weight-semibold);
  color: var(--primary-color);
  margin-bottom: var(--space-md);
}

.footer-subtitle {
  font-size: var(--font-size-base);
  font-weight: var(--font-weight-medium);
  color: var(--text-color);
  margin-bottom: var(--space-sm);
}

.footer-description,
.footer-note {
  font-size: var(--font-size-sm);
  color: var(--text-secondary);
  line-height: var(--line-height-relaxed);
  margin: 0;
}

.footer-links {
  list-style: none;
  padding: 0;
  margin: 0;
}

.footer-links li {
  margin-bottom: var(--space-sm);
}

.footer-links a {
  font-size: var(--font-size-sm);
  color: var(--text-secondary);
  text-decoration: none;
  transition: color var(--animation-duration-fast) var(--animation-easing);
}

.footer-links a:hover,
.footer-links a:focus {
  color: var(--primary-color);
}

.footer-bottom {
  max-width: var(--max-width-container);
  margin: 0 auto;
  padding: var(--space-lg) var(--space-md) 0;
  border-top: 1px solid var(--border-color);
  margin-top: var(--space-xl);
  text-align: center;
}

.footer-copyright {
  font-size: var(--font-size-xs);
  color: var(--text-muted);
  margin: 0;
}

/* Responsive Behavior - Drawer always active */
.nav-menu {
  position: fixed;
  top: var(--header-height);
  left: -100%;
  width: 100%;
  max-width: 320px;
  height: calc(100vh - var(--header-height));
  background-color: var(--background-overlay);
  backdrop-filter: blur(10px);
  flex-direction: column;
  align-items: stretch;
  justify-content: flex-start;
  padding: var(--space-lg);
  transition: left var(--animation-duration-normal) var(--animation-easing);
  z-index: var(--z-fixed);
  overflow-y: auto;
}

.nav-menu.open {
  left: 0;
}

.nav-list {
  flex-direction: column;
  align-items: stretch;
  gap: var(--space-sm);
  margin-bottom: var(--space-xl);
}

.nav-link {
  justify-content: center;
  padding: var(--space-md);
  background-color: var(--surface-color);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
}

.nav-controls {
  justify-content: center;
  gap: var(--space-md);
}

/* Mobile-specific adjustments */
@media (max-width: 767px) {
  .nav-menu {
    max-width: 100%;
  }

  /* Hide deck drawer on mobile */
  .deck-index-drawer {
    display: none;
  }

  /* Footer mobile layout */
  .footer-content {
    grid-template-columns: 1fr;
    text-align: center;
    gap: var(--space-lg);
  }
}

@media (min-width: 768px) {
  /* Footer desktop layout */
  .footer-content {
    grid-template-columns: 2fr 1fr 1.5fr;
    text-align: left;
  }

  .footer-section:first-child {
    text-align: left;
  }
}

@media (min-width: 1024px) {
  /* Larger header on desktop */
  .nav-container {
    padding: 0 var(--space-xl);
  }
  
  .footer-content {
    padding: 0 var(--space-xl);
  }
  
  .footer-bottom {
    padding: var(--space-lg) var(--space-xl) 0;
  }
}

/* Loading states */
.loading-overlay {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background-color: var(--background-overlay);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: var(--z-modal);
}

.loading-spinner {
  width: 40px;
  height: 40px;
  border: 3px solid var(--border-color);
  border-top: 3px solid var(--primary-color);
  border-radius: 50%;
  animation: spin 1s linear infinite;
}

@keyframes spin {
  0% { transform: rotate(0deg); }
  100% { transform: rotate(360deg); }
}

/* Accessibility enhancements */
@media (prefers-reduced-motion: reduce) {
  .nav-menu,
  .deck-index-drawer {
    transition: none;
  }
  
  .loading-spinner {
    animation: none;
    border-top-color: var(--primary-color);
  }
}