/* ==========================================================================
   MOBILE NAVIGATION - CLINICAL UX OPTIMIZED
   Bottom sheet menu, one-hand usability, fast paths
   ========================================================================== */

/* Mobile Controls (Header) */
.handbook-mobile-controls {
  display: none;
  gap: var(--space-2);
  align-items: center;
}

.handbook-mobile-button {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 48px;
  height: 48px;
  padding: 0;
  background: none;
  border: 1px solid var(--color-border-primary);
  border-radius: var(--radius-md);
  color: var(--color-text-secondary);
  cursor: pointer;
  transition: all var(--transition-base);
  -webkit-tap-highlight-color: transparent;
}

.dark .handbook-mobile-button {
  border-color: var(--color-dark-border);
  color: var(--color-dark-text-secondary);
}

.handbook-mobile-button:hover,
.handbook-mobile-button:focus {
  background-color: var(--color-bg-tertiary);
  border-color: var(--color-info-accent);
  color: var(--color-info-accent);
  outline: 2px solid var(--color-focus-ring);
  outline-offset: 2px;
}

.dark .handbook-mobile-button:hover,
.dark .handbook-mobile-button:focus {
  background-color: var(--color-dark-bg-tertiary);
  border-color: var(--color-info-accent);
}

.handbook-mobile-button svg {
  width: 20px;
  height: 20px;
}

/* Mobile Menu Overlay */
.mobile-menu-overlay {
  display: none;
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background-color: rgba(0, 0, 0, 0.5);
  z-index: 9998;
  opacity: 0;
  transition: opacity var(--transition-base);
  -webkit-tap-highlight-color: transparent;
}

.mobile-menu-overlay.mobile-menu-overlay-visible {
  display: block;
  opacity: 1;
}

.dark .mobile-menu-overlay {
  background-color: rgba(0, 0, 0, 0.7);
}

/* Mobile Menu Bottom Sheet */
.mobile-menu-sheet {
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  max-height: 85vh;
  background-color: var(--color-bg-primary);
  border-top-left-radius: 16px;
  border-top-right-radius: 16px;
  box-shadow: 0 -4px 24px rgba(0, 0, 0, 0.15);
  z-index: 9999;
  transform: translateY(100%);
  transition: transform var(--transition-slow) cubic-bezier(0.4, 0, 0.2, 1);
  display: flex;
  flex-direction: column;
  overflow: hidden;
  -webkit-overflow-scrolling: touch;
}

.dark .mobile-menu-sheet {
  background-color: var(--color-dark-bg-secondary);
  box-shadow: 0 -4px 24px rgba(0, 0, 0, 0.5);
}

.mobile-menu-sheet.mobile-menu-open {
  transform: translateY(0);
}

/* Mobile Menu Header */
.mobile-menu-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--space-4) var(--space-5);
  border-bottom: 1px solid var(--color-border-primary);
  flex-shrink: 0;
}

.dark .mobile-menu-header {
  border-bottom-color: var(--color-dark-border);
}

.mobile-menu-title {
  font-size: var(--text-lg);
  font-weight: var(--font-semibold);
  color: var(--color-text-primary);
  margin: 0;
}

.dark .mobile-menu-title {
  color: var(--color-dark-text-primary);
}

.mobile-menu-close {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 48px;
  height: 48px;
  padding: 0;
  background: none;
  border: none;
  border-radius: var(--radius-md);
  color: var(--color-text-secondary);
  cursor: pointer;
  transition: all var(--transition-base);
  -webkit-tap-highlight-color: transparent;
}

.dark .mobile-menu-close {
  color: var(--color-dark-text-secondary);
}

.mobile-menu-close:hover,
.mobile-menu-close:focus {
  background-color: var(--color-bg-tertiary);
  color: var(--color-text-primary);
  outline: 2px solid var(--color-focus-ring);
  outline-offset: 2px;
}

.dark .mobile-menu-close:hover,
.dark .mobile-menu-close:focus {
  background-color: var(--color-dark-bg-tertiary);
  color: var(--color-dark-text-primary);
}

.mobile-menu-close svg {
  width: 24px;
  height: 24px;
}

/* Mobile Menu Content */
.mobile-menu-content {
  flex: 1;
  overflow-y: auto;
  padding: var(--space-4) 0;
  -webkit-overflow-scrolling: touch;
}

.mobile-menu-list {
  list-style: none;
  padding: 0;
  margin: 0;
}

.mobile-menu-list li {
  margin: 0;
}

.mobile-menu-link {
  display: block;
  padding: var(--space-4) var(--space-5);
  color: var(--color-text-primary);
  text-decoration: none;
  font-size: var(--text-base);
  font-weight: var(--font-regular);
  transition: all var(--transition-base);
  min-height: 56px;
  display: flex;
  align-items: center;
  -webkit-tap-highlight-color: transparent;
}

.dark .mobile-menu-link {
  color: var(--color-dark-text-primary);
}

.mobile-menu-link:hover,
.mobile-menu-link:focus {
  background-color: var(--color-bg-tertiary);
  color: var(--color-info-accent);
  outline: none;
}

.dark .mobile-menu-link:hover,
.dark .mobile-menu-link:focus {
  background-color: var(--color-dark-bg-tertiary);
  color: var(--color-info-accent);
}

.mobile-menu-link.active {
  background-color: var(--color-info-bg);
  color: var(--color-info-accent);
  font-weight: var(--font-medium);
}

.dark .mobile-menu-link.active {
  background-color: var(--color-dark-bg-tertiary);
  color: var(--color-info-accent);
}

.mobile-menu-link-emergency {
  color: var(--color-critical-accent);
  font-weight: var(--font-medium);
}

.mobile-menu-link-emergency::before {
  content: "🚨";
  margin-right: var(--space-2);
  font-size: var(--text-lg);
}

/* Mobile Menu Sections */
.mobile-menu-quick-access {
  margin-top: var(--space-6);
  padding-top: var(--space-6);
  border-top: 1px solid var(--color-border-primary);
}

.dark .mobile-menu-quick-access {
  border-top-color: var(--color-dark-border);
}

.mobile-menu-section-title {
  font-size: var(--text-sm);
  font-weight: var(--font-semibold);
  text-transform: uppercase;
  letter-spacing: var(--tracking-wider);
  color: var(--color-text-tertiary);
  padding: 0 var(--space-5);
  margin: 0 0 var(--space-3) 0;
}

.dark .mobile-menu-section-title {
  color: var(--color-dark-text-tertiary);
}

/* Search Prominence on Mobile */
@media (max-width: 768px) {
  .search-container {
    position: sticky;
    top: 60px;
    z-index: 100;
    background-color: var(--color-bg-primary);
    padding: var(--space-4) var(--space-4) var(--space-3);
    border-bottom: 1px solid var(--color-border-primary);
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.05);
  }

  .dark .search-container {
    background-color: var(--color-dark-bg-primary);
    border-bottom-color: var(--color-dark-border);
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.2);
  }

  .search-input {
    height: 48px;
    font-size: 16px; /* Prevents zoom on iOS */
  }
}

/* Responsive: Show Mobile Controls */
@media (max-width: 768px) {
  .handbook-mobile-controls {
    display: flex;
  }

  .handbook-header-nav {
    display: none;
  }
}

/* Prevent body scroll when menu is open */
body.mobile-menu-open {
  overflow: hidden;
  position: fixed;
  width: 100%;
}

/* Accessibility: Focus management */
.mobile-menu-sheet:focus-within {
  outline: none;
}

.mobile-menu-link:focus-visible {
  outline: 2px solid var(--color-focus-ring);
  outline-offset: -2px;
}

/* Swipe indicator (visual hint) */
.mobile-menu-sheet::before {
  content: '';
  position: absolute;
  top: var(--space-2);
  left: 50%;
  transform: translateX(-50%);
  width: 40px;
  height: 4px;
  background-color: var(--color-border-secondary);
  border-radius: 2px;
  opacity: 0.5;
}

.dark .mobile-menu-sheet::before {
  background-color: var(--color-dark-border);
}