/* =============================================================================
   HEADER STYLES - Header, navigation, search, and filter components
   ============================================================================= */

/* Header Styles */
.header {
  background: var(--bg-primary);
  border-bottom: 1px solid var(--border-primary);
  position: sticky;
  top: 0;
  z-index: 100;
  box-shadow: var(--shadow-sm);
  transition: background-color 0.3s ease, border-color 0.3s ease;
}

/* Prevent horizontal overflow on mobile */
.header-container {
  overflow-x: hidden;
  width: 100%;
}

/* Admin Header Override */
.header.admin-header {
  background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

[data-theme="dark"] .header.admin-header {
  background: linear-gradient(135deg, #4c1d95 0%, #581c87 100%);
}

.header-container {
  max-width: 1400px;
  margin: 0 auto;
}

.admin-header .site-title a,
.admin-header .site-title span {
  color: white !important;
}

.admin-header .btn-icon {
  color: rgba(255, 255, 255, 0.8) !important;
}

.admin-header .btn-icon:hover:not(.disabled) {
  background-color: rgba(255, 255, 255, 0.1) !important;
  color: white !important;
}

.admin-header .btn-icon.active:not(.disabled) {
  background-color: rgba(255, 255, 255, 0.2) !important;
  color: white !important;
}

.admin-header .icon-separator {
  background: rgba(255, 255, 255, 0.3) !important;
}

.admin-header .logout-btn {
  background: rgba(220, 38, 38, 0.2) !important;
  border: 1px solid rgba(220, 38, 38, 0.3) !important;
  border-radius: 0.375rem !important;
}

.admin-header .logout-btn:hover {
  background: rgba(220, 38, 38, 0.3) !important;
  border-color: rgba(220, 38, 38, 0.5) !important;
  color: white !important;
}

.header-content {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 1rem 0;
}

.site-title {
  font-size: 1.5rem;
  font-weight: 700;
}

.site-title a {
  text-decoration: none;
  color: var(--text-primary);
}

.site-logo {
  height: 2.5rem;
  width: auto;
  transition: opacity 0.2s;
}

.site-logo:hover {
  opacity: 0.8;
}

/* Theme-specific logo display */
.light-logo {
  display: block;
}

.dark-logo {
  display: none;
}

[data-theme="dark"] .light-logo {
  display: none;
}

[data-theme="dark"] .dark-logo {
  display: block;
}

.header-controls {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

/* Icon Groups - Clean spacing within groups */
.icon-group {
  display: flex;
  gap: 0.25rem;
}

/* Vertical Separators - Fixed thickness */
.icon-separator {
  width: 1px;
  height: 1.5rem;
  background: var(--border-secondary);
  margin: 0 0.5rem;
  transition: background-color 0.3s ease;
  flex-shrink: 0;
}

[data-theme="dark"] .icon-separator {
  background: var(--border-primary);
}

.btn-icon {
  position: relative;
  background: none;
  border: none;
  padding: 0.75rem;
  border-radius: 0.375rem;
  cursor: pointer;
  color: var(--text-secondary);
  transition: all 0.2s;
  text-decoration: none;
  display: inline-flex;
  align-items: center;
  justify-content: center;
}

.btn-icon svg {
  width: 30px;
  height: 30px;
  stroke-width: 1;
  /* Applies to all icons except the lightbulb */
}

/* Site title lightbulb icon responsiveness */
.site-title svg {
  width: 50px;
  height: 50px;
  transition: all 0.3s ease;
}

.btn-icon:hover:not(.disabled) {
  background-color: var(--background-secondary);
  color: var(--text-primary);
}

.btn-icon.active:not(.disabled) {
  background-color: var(--accent-light);
  color: var(--accent-primary);
}

/* Disabled state for buttons with diagonal strikethrough */
.btn-icon.disabled {
  position: relative;
  cursor: not-allowed;
  color: #9ca3af;
  opacity: 0.6;
}

[data-theme="dark"] .btn-icon.disabled {
  color: #4b5563;
  opacity: 0.7;
}

.btn-icon.disabled::before {
  content: "";
  position: absolute;
  top: 15%;
  left: 15%;
  right: 15%;
  bottom: 15%;
  background: linear-gradient(to top right, transparent 48%, #6b7280 49%, #6b7280 51%, transparent 52%);
  pointer-events: none;
  z-index: 1;
}

[data-theme="dark"] .btn-icon.disabled::before {
  background: linear-gradient(to top right, transparent 48%, #374151 49%, #374151 51%, transparent 52%);
}

.btn-icon.disabled:hover {
  background-color: transparent;
}

.icon-group .btn-icon {
  padding: 0.625rem;
}

.badge {
  position: absolute;
  top: 0;
  right: 0;
  background: var(--accent-primary);
  color: var(--bg-primary);
  font-size: 0.75rem;
  padding: 0.125rem 0.375rem;
  border-radius: 9999px;
  min-width: 1.25rem;
  text-align: center;
}

/* Theme Toggle */
.theme-toggle {
  position: relative;
}

.theme-toggle .moon-icon {
  display: block;
}

.theme-toggle .sun-icon {
  display: none;
}

[data-theme="dark"] .theme-toggle .moon-icon {
  display: none;
}

[data-theme="dark"] .theme-toggle .sun-icon {
  display: block;
}

/* Search Bar */
.search-bar {
  display: none;
  padding: 1rem 0;
  border-top: 1px solid var(--border-primary);
  transition: border-color 0.3s ease;
}

.search-bar.active {
  display: block;
}

.search-input-group {
  display: flex;
  align-items: center;
  background: var(--bg-tertiary);
  border-radius: 0.5rem;
  padding: 0.75rem;
  gap: 0.75rem;
  transition: background-color 0.3s ease;
}

.search-input {
  flex: 1;
  border: none;
  background: none;
  outline: none;
  font-size: 1rem;
  color: var(--text-primary);
}

.search-input::placeholder {
  color: var(--text-tertiary);
}

/* Filter Panel */
.filter-panel {
  display: none;
  padding: 0 0 1rem 0;
  margin-bottom: 1rem;
  background: var(--bg-tertiary);
  border-top: 1px solid var(--border-primary);
  border-radius: 1rem;
  transition: background-color 0.3s ease, border-color 0.3s ease;
}

.filter-panel.active {
  display: block;
}

.filter-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin: 0.75rem;
}

.filter-header h3 {
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--text-primary);
}

.tags-grid {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin: 0rem 0.75rem;
}

/* Active Filters - Container for currently applied filters */
.active-filters {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.75rem;
  padding: 0.75rem 0;
  border-top: 1px solid var(--border-primary);
}

.filter-label {
  font-weight: 500;
  color: var(--text-tertiary);
}

.remove-filter {
  font-weight: bold;
  margin-left: 0.25rem;
  color: inherit;
  text-decoration: none;
}

.remove-filter:hover {
  opacity: 0.7;
}

/* Admin Mode Styles */
.admin-indicator {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 1rem;
  text-align: center;
  padding: 0.5rem 1rem;
  border-top: 1px solid var(--border-primary);
  margin-top: 0.5rem;
  background: var(--bg-secondary);
  border-radius: 0.5rem;
}

.admin-badge {
  display: inline-block;
  background: #ef4444;
  color: white;
  padding: 0.25rem 0.75rem;
  border-radius: 9999px;
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.admin-btn {
  position: relative;
}

.admin-btn::after {
  content: "";
  position: absolute;
  top: -2px;
  right: -2px;
  width: 6px;
  height: 6px;
  background: #ef4444;
  border-radius: 50%;
  border: 1px solid var(--bg-primary);
}

.admin-btn:hover {
  background-color: rgba(239, 68, 68, 0.1);
  color: #ef4444;
}

.admin-logout-btn {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.25rem 0.75rem;
  background: #dc2626;
  color: white;
  text-decoration: none;
  border-radius: 0.375rem;
  font-size: 0.875rem;
  font-weight: 500;
  transition: background-color 0.2s ease;
}

.admin-logout-btn:hover {
  background: #b91c1c;
}

.admin-logout-btn svg {
  flex-shrink: 0;
}

[data-theme="dark"] .admin-btn:hover {
  background-color: rgba(239, 68, 68, 0.2);
}

/* Header Responsive Design */
@media (max-width: 768px) {
  .header-container {
    padding: 0 1rem;
  }

  .header-content {
    padding: 0.75rem 0;
    flex-wrap: wrap;
    gap: 0.5rem;
  }

  .site-title {
    font-size: 1.25rem;
    flex: 1;
    min-width: 0; /* Allow shrinking */
  }

  /* Mobile-optimized site title styling */
  .site-title a {
    gap: 0.5rem !important;
    flex-wrap: nowrap;
    min-width: 0;
  }

  .site-title a span:first-child {
    padding-left: 0.5rem !important;
    padding-right: 0.25rem !important;
    flex-shrink: 0;
  }

  .site-title a span:last-child {
    font-size: 1.1rem !important;
    line-height: 1.2;
    word-break: break-word;
    overflow-wrap: break-word;
  }

  /* Lightbulb icon mobile sizing */
  .site-title svg {
    width: 35px !important;
    height: 35px !important;
  }

  .header-controls {
    gap: 0.25rem;
    flex-shrink: 0;
  }

  .icon-group {
    gap: 0.125rem;
  }

  .btn-icon {
    padding: 0.5rem;
  }

  .btn-icon svg {
    width: 24px !important;
    height: 24px !important;
  }

  .icon-separator {
    height: 1.25rem;
    margin: 0 0.25rem;
  }

  .search-input-group {
    padding: 0.5rem;
    gap: 0.5rem;
  }

  .tags-grid {
    gap: 0.375rem;
  }

  .tag {
    font-size: 0.6875rem;
    padding: 0.1875rem 0.625rem;
  }

  .site-logo {
    height: 2rem;
  }
}

@media (max-width: 480px) {
  .header-container {
    padding: 0 0.75rem;
  }

  .header-content {
    padding: 0.5rem 0;
    gap: 0.75rem;
  }

  .site-title {
    font-size: 1rem;
    order: 1;
    width: 100%;
  }

  .site-title a span:first-child {
    padding-left: 0.25rem !important;
    padding-right: 0.25rem !important;
  }

  .site-title a span:last-child {
    font-size: 0.95rem !important;
  }

  /* Lightbulb icon smaller mobile sizing */
  .site-title svg {
    width: 28px !important;
    height: 28px !important;
  }

  .header-controls {
    order: 2;
    width: 100%;
    justify-content: center;
    gap: 0.5rem;
    padding-top: 0.25rem;
    border-top: 1px solid var(--border-primary);
  }

  .btn-icon {
    padding: 0.375rem;
  }

  .btn-icon svg {
    width: 20px !important;
    height: 20px !important;
  }

  .icon-separator {
    height: 1rem;
    margin: 0 0.375rem;
  }

  .search-input-group {
    flex-direction: column;
    gap: 0.5rem;
  }

  .search-input-group .btn {
    width: 100%;
  }

  .filter-panel {
    margin: 0 -0.75rem;
    border-radius: 0;
  }

  .tags-grid {
    gap: 0.25rem;
    margin: 0 0.5rem;
  }

  .tag {
    font-size: 0.625rem;
    padding: 0.125rem 0.5rem;
  }

  .active-filters {
    flex-direction: column;
    align-items: flex-start;
    gap: 0.5rem;
    padding: 0.5rem 0;
  }

  .active-filters > span {
    font-weight: 600;
  }
}

@media (max-width: 360px) {
  .header-container {
    padding: 0 0.5rem;
  }

  .site-title a span:last-child {
    font-size: 0.85rem !important;
  }

  /* Lightbulb icon extra small mobile sizing */
  .site-title svg {
    width: 24px !important;
    height: 24px !important;
  }

  .header-controls {
    gap: 0.25rem;
  }

  .icon-group {
    gap: 0.1rem;
  }

  .btn-icon {
    padding: 0.25rem;
    /* Increase touch target for very small screens */
    min-width: 32px;
    min-height: 32px;
  }

  .btn-icon svg {
    width: 18px !important;
    height: 18px !important;
  }

  .icon-separator {
    margin: 0 0.25rem;
  }

  /* Ensure site title doesn't break on very small screens */
  .site-title a {
    max-width: 100%;
    overflow: hidden;
  }

  .site-title a span:last-child {
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
  }
}