/**
 * AI Services Blog - Filter Bar Styles
 * Path: /ai-services/css/filters.css
 * 
 * Description: Comprehensive styling for the filter system including:
 * - Search input with icon, placeholder, and focus states
 * - Filter dropdown selects with consistent styling
 * - Clear Filters button with proper colors and hover effects
 * - Results count display
 * - Responsive layout (horizontal on desktop, vertical on mobile)
 * - Focus states for keyboard navigation and accessibility
 * 
 * Requirements: 2.1-2.6, 10.1-10.6, 11.1
 */

/* ===================================================================
   1. FILTER BAR CONTAINER
   =================================================================== */

.filter-bar {
  background-color: var(--color-white);
  border-bottom: 1px solid var(--color-border-gray);
  padding: var(--spacing-6) var(--spacing-4);
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.08);
  transition: all var(--transition-base);
  
  /* Sticky positioning for easier filtering while scrolling */
  position: sticky;
  top: 0;
  z-index: var(--z-sticky);
}

/* Subtle shadow when filter bar is sticky and scrolled */
.filter-bar.scrolled {
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
}

.filter-bar:focus-within {
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.12);
}

/* ===================================================================
   2. SEARCH INPUT STYLES
   =================================================================== */

.search-input {
  width: 100%;
  padding: var(--spacing-3) var(--spacing-4);
  font-size: var(--font-size-base);
  line-height: var(--line-height-normal);
  color: var(--text-primary);
  background-color: var(--color-white);
  border: 1.5px solid var(--color-border-gray);
  border-radius: var(--radius-md);
  transition: all var(--transition-base);
  font-family: var(--font-primary);
  
  /* Icon positioning */
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='%23999' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3E%3Ccircle cx='11' cy='11' r='8'%3E%3C/circle%3E%3Cpath d='m21 21-4.35-4.35'%3E%3C/path%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: left var(--spacing-3) center;
  background-size: 20px 20px;
  padding-left: var(--spacing-10);
}

/* Placeholder styling */
.search-input::placeholder {
  color: var(--text-light);
  opacity: 0.8;
  font-style: italic;
}

/* Focus state - prominent visual feedback */
.search-input:focus {
  outline: none;
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px rgba(255, 31, 142, 0.1);
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='%23ff1f8e' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3E%3Ccircle cx='11' cy='11' r='8'%3E%3C/circle%3E%3Cpath d='m21 21-4.35-4.35'%3E%3C/path%3E%3C/svg%3E");
}

/* Hover state */
.search-input:hover {
  border-color: var(--color-primary);
}

/* Active/focused state with text input */
.search-input:not(:placeholder-shown) {
  border-color: var(--color-primary);
}

/* Clear button inside search (for browsers that support it) */
.search-input::-webkit-search-cancel-button {
  appearance: none;
  cursor: pointer;
  width: 16px;
  height: 16px;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='%23999'%3E%3Cpath d='M19 6.41L17.59 5 12 10.59 6.41 5 5 6.41 10.59 12 5 17.59 6.41 19 12 13.41 17.59 19 19 17.59 13.41 12z'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-size: 16px 16px;
  background-position: center;
}

/* Disabled state */
.search-input:disabled {
  background-color: var(--bg-secondary);
  color: var(--text-light);
  cursor: not-allowed;
  opacity: 0.6;
}

/* ===================================================================
   3. FILTER DROPDOWN SELECTS
   =================================================================== */

/* Base select styling */
select.filter-select,
.filter-category,
.filter-industry,
.filter-department,
.filter-framework {
  padding: var(--spacing-2) var(--spacing-3);
  font-size: var(--font-size-base);
  line-height: var(--line-height-normal);
  color: var(--text-primary);
  background-color: var(--color-white);
  border: 1.5px solid var(--color-border-gray);
  border-radius: var(--radius-md);
  transition: all var(--transition-base);
  font-family: var(--font-primary);
  cursor: pointer;
  appearance: none;
  padding-right: var(--spacing-10);
  min-height: 44px;
  
  /* Custom dropdown arrow */
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 20 20' fill='%236a6a8e'%3E%3Cpath fill-rule='evenodd' d='M5.293 7.293a1 1 0 011.414 0L10 10.586l3.293-3.293a1 1 0 111.414 1.414l-4 4a1 1 0 01-1.414 0l-4-4a1 1 0 010-1.414z' clip-rule='evenodd' /%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right var(--spacing-3) center;
  background-size: 16px 16px;
  
  /* Hide default arrow */
  -webkit-appearance: none;
  -moz-appearance: none;
}

/* Focus state for dropdowns */
select.filter-select:focus,
.filter-category:focus,
.filter-industry:focus,
.filter-department:focus,
.filter-framework:focus {
  outline: none;
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px rgba(255, 31, 142, 0.1);
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 20 20' fill='%23ff1f8e'%3E%3Cpath fill-rule='evenodd' d='M5.293 7.293a1 1 0 011.414 0L10 10.586l3.293-3.293a1 1 0 111.414 1.414l-4 4a1 1 0 01-1.414 0l-4-4a1 1 0 010-1.414z' clip-rule='evenodd' /%3E%3C/svg%3E");
}

/* Hover state for dropdowns */
select.filter-select:hover,
.filter-category:hover,
.filter-industry:hover,
.filter-department:hover,
.filter-framework:hover {
  border-color: var(--color-primary);
  background-color: rgba(255, 31, 142, 0.02);
}

/* Active/open state */
select.filter-select:active,
.filter-category:active,
.filter-industry:active,
.filter-department:active,
.filter-framework:active {
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px rgba(255, 31, 142, 0.1);
}

/* Disabled state */
select.filter-select:disabled,
.filter-category:disabled,
.filter-industry:disabled,
.filter-department:disabled,
.filter-framework:disabled {
  background-color: var(--bg-secondary);
  color: var(--text-light);
  cursor: not-allowed;
  opacity: 0.6;
}

/* Firefox specific styling */
select.filter-select,
.filter-category,
.filter-industry,
.filter-department,
.filter-framework {
  
  @-moz-document url-prefix() {
    padding-right: var(--spacing-4);
  }
}

/* ===================================================================
   4. FILTER CONTROLS LAYOUT - HORIZONTAL (Desktop)
   =================================================================== */

.filter-controls {
  display: flex;
  flex-direction: row;
  flex-wrap: wrap;
  gap: var(--spacing-4);
  align-items: center;
  justify-content: flex-start;
}

/* Flex items grow to fill available space */
.filter-controls select,
.filter-controls .filter-select {
  flex: 1;
  min-width: 150px;
}

/* ===================================================================
   5. CLEAR FILTERS BUTTON
   =================================================================== */

.clear-filters,
#clear-filters,
button.btn-clear-filters {
  padding: var(--spacing-2) var(--spacing-5);
  font-size: var(--font-size-base);
  font-weight: var(--font-weight-semibold);
  color: var(--color-error);
  background-color: rgba(255, 80, 80, 0.08);
  border: 1.5px solid rgba(255, 80, 80, 0.2);
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: all var(--transition-base);
  min-height: 44px;
  white-space: nowrap;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  
  /* Icon styling */
  i {
    margin-right: var(--spacing-2);
    
    &:first-child {
      margin-left: 0;
    }
  }
}

/* Hover state - more prominent when user hovers */
.clear-filters:hover,
#clear-filters:hover,
button.btn-clear-filters:hover {
  background-color: rgba(255, 80, 80, 0.15);
  border-color: rgba(255, 80, 80, 0.4);
  color: var(--color-error);
  box-shadow: 0 2px 8px rgba(255, 80, 80, 0.15);
}

/* Focus state - keyboard navigation */
.clear-filters:focus,
#clear-filters:focus,
button.btn-clear-filters:focus {
  outline: none;
  border-color: var(--color-error);
  box-shadow: 0 0 0 3px rgba(255, 80, 80, 0.15);
  background-color: rgba(255, 80, 80, 0.12);
}

/* Active/pressed state */
.clear-filters:active,
#clear-filters:active,
button.btn-clear-filters:active {
  background-color: rgba(255, 80, 80, 0.2);
  transform: scale(0.98);
}

/* Disabled state */
.clear-filters:disabled,
#clear-filters:disabled,
button.btn-clear-filters:disabled {
  opacity: 0.5;
  cursor: not-allowed;
  pointer-events: none;
}

/* ===================================================================
   6. RESULTS COUNT DISPLAY
   =================================================================== */

.results-count,
.filter-results-count {
  display: inline-flex;
  align-items: center;
  justify-content: flex-end;
  font-size: var(--font-size-sm);
  color: var(--text-secondary);
  white-space: nowrap;
  padding: var(--spacing-2) var(--spacing-3);
  background-color: rgba(79, 77, 175, 0.04);
  border-radius: var(--radius-md);
  border: 1px solid rgba(79, 77, 175, 0.1);
}

/* Highlighted count numbers */
.results-count #visible-count,
.results-count #total-count {
  font-weight: var(--font-weight-bold);
  color: var(--color-primary);
  margin: 0 var(--spacing-1);
}

/* ARIA live region for screen readers */
[aria-live] {
  position: relative;
}

/* ===================================================================
   7. RESPONSIVE LAYOUT - MOBILE (< 768px)
   =================================================================== */

@media (max-width: 767px) {
  .filter-bar {
    padding: var(--spacing-4) var(--spacing-3);
  }
  
  /* Search input takes full width */
  .search-input {
    width: 100%;
    margin-bottom: var(--spacing-4);
  }
  
  /* Stack filter controls vertically on mobile */
  .filter-controls {
    flex-direction: column;
    gap: var(--spacing-3);
    width: 100%;
  }
  
  /* Dropdowns take full width on mobile */
  .filter-controls select,
  .filter-controls .filter-select,
  .filter-category,
  .filter-industry,
  .filter-department,
  .filter-framework {
    width: 100%;
    min-width: 100%;
    flex: none;
  }
  
  /* Clear button takes full width on mobile */
  .clear-filters,
  #clear-filters,
  button.btn-clear-filters {
    width: 100%;
    justify-content: center;
  }
  
  /* Results count stacks below filters on mobile */
  .results-count,
  .filter-results-count {
    display: block;
    width: 100%;
    text-align: center;
    margin-top: var(--spacing-4);
    padding: var(--spacing-3);
  }
  
  /* Touch targets on mobile */
  .search-input,
  .filter-select,
  .clear-filters,
  #clear-filters,
  button.btn-clear-filters {
    min-height: 48px;
    font-size: 16px; /* Prevents zoom on iOS */
  }
}

/* ===================================================================
   8. RESPONSIVE LAYOUT - TABLET (768px - 1023px)
   =================================================================== */

@media (min-width: 768px) and (max-width: 1023px) {
  .filter-bar {
    padding: var(--spacing-5) var(--spacing-4);
  }
  
  /* Search input on its own row */
  .search-input {
    margin-bottom: var(--spacing-4);
    width: 100%;
  }
  
  /* Create 2x2 grid for filters on tablet */
  .filter-controls {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: var(--spacing-3);
  }
  
  /* Results count spans both columns */
  .results-count,
  .filter-results-count {
    grid-column: 1 / -1;
    justify-self: end;
  }
  
  /* Ensure dropdowns fill their grid cells */
  .filter-category,
  .filter-industry,
  .filter-department,
  .filter-framework {
    width: 100%;
  }
}

/* ===================================================================
   9. RESPONSIVE LAYOUT - DESKTOP (>= 1024px)
   =================================================================== */

@media (min-width: 1024px) {
  .filter-bar {
    padding: var(--spacing-6) var(--spacing-4);
  }
  
  /* Search input takes appropriate width */
  .search-input {
    margin-bottom: var(--spacing-4);
    width: 100%;
  }
  
  /* Horizontal layout for desktop */
  .filter-controls {
    flex-direction: row;
    gap: var(--spacing-3);
    align-items: center;
    flex-wrap: nowrap;
    width: 100%;
  }
  
  /* Dropdowns have flex basis but grow if needed */
  .filter-category,
  .filter-industry,
  .filter-department,
  .filter-framework {
    flex: 1;
    min-width: 120px;
  }
  
  /* Clear button doesn't grow, has fixed width */
  .clear-filters,
  #clear-filters,
  button.btn-clear-filters {
    flex: 0 0 auto;
    white-space: nowrap;
  }
  
  /* Results count on the right */
  .results-count,
  .filter-results-count {
    display: inline-flex;
    flex: 0 0 auto;
    margin-left: auto;
  }
}

/* ===================================================================
   10. KEYBOARD NAVIGATION & FOCUS MANAGEMENT
   =================================================================== */

/* Visible focus indicator for keyboard users */
.filter-bar *:focus-visible {
  outline: 2px solid var(--color-accent);
  outline-offset: 2px;
}

/* Tab order indicators */
.search-input:focus-visible,
.filter-select:focus-visible,
.clear-filters:focus-visible {
  outline: 2px dashed var(--color-accent);
  outline-offset: 3px;
}

/* Skip focus indicator on non-keyboard input methods */
.filter-bar *:focus:not(:focus-visible) {
  outline: none;
}

/* Ensure sufficient color contrast for all elements */
@media (prefers-contrast: more) {
  .filter-bar {
    border-bottom: 2px solid var(--text-primary);
  }
  
  .search-input,
  .filter-select {
    border-width: 2px;
  }
}

/* ===================================================================
   11. REDUCED MOTION SUPPORT (Accessibility)
   =================================================================== */

@media (prefers-reduced-motion: reduce) {
  .search-input,
  .filter-select,
  .clear-filters,
  #clear-filters {
    transition: none;
  }
  
  .clear-filters:active,
  #clear-filters:active {
    transform: none;
  }
}

/* ===================================================================
   12. DARK MODE SUPPORT (Future)
   =================================================================== */

@media (prefers-color-scheme: dark) {
  .filter-bar {
    background-color: var(--bg-dark);
    border-bottom-color: rgba(255, 255, 255, 0.1);
  }
  
  .search-input,
  .filter-select {
    background-color: rgba(255, 255, 255, 0.05);
    border-color: rgba(255, 255, 255, 0.1);
    color: var(--text-inverse);
  }
  
  .search-input:focus,
  .filter-select:focus {
    background-color: rgba(255, 31, 142, 0.1);
    border-color: var(--color-primary);
  }
}

/* ===================================================================
   13. EMPTY STATE STYLING
   =================================================================== */

/* Hide/show results count based on filter state */
.filter-bar.no-results .results-count {
  color: var(--color-error);
}

.filter-bar.no-results .results-count #visible-count {
  color: var(--color-error);
}

/* ===================================================================
   14. ANIMATION & TRANSITION EFFECTS
   =================================================================== */

/* Smooth transition for filter changes */
.filter-bar {
  transition: box-shadow var(--transition-base),
              background-color var(--transition-base);
}

/* Fade in/out for input text changes */
.search-input {
  transition: border-color var(--transition-base),
              box-shadow var(--transition-base),
              background-image var(--transition-base),
              background-color var(--transition-base);
}

.filter-select {
  transition: border-color var(--transition-base),
              box-shadow var(--transition-base),
              background-color var(--transition-base),
              background-image var(--transition-base);
}

.clear-filters,
#clear-filters {
  transition: all var(--transition-base);
}

/* ===================================================================
   15. HIGH-CONTRAST MODE
   =================================================================== */

@media (prefers-contrast: more) {
  .search-input,
  .filter-select,
  .clear-filters,
  #clear-filters {
    border-width: 2px;
  }
  
  .results-count {
    border-width: 2px;
  }
}

/* ===================================================================
   16. INTERACTION STATES
   =================================================================== */

/* Show active filter indicator */
.filter-controls select:not([value=""]),
.filter-category:not([value=""]),
.filter-industry:not([value=""]),
.filter-department:not([value=""]),
.filter-framework:not([value=""]) {
  border-color: var(--color-primary);
  background-color: rgba(255, 31, 142, 0.04);
}

/* Button active/loading state */
.clear-filters.loading,
#clear-filters.loading,
button.btn-clear-filters.loading {
  opacity: 0.8;
  cursor: wait;
}

.clear-filters.loading::after,
#clear-filters.loading::after {
  content: '';
  display: inline-block;
  width: 12px;
  height: 12px;
  margin-left: var(--spacing-2);
  border: 2px solid rgba(255, 80, 80, 0.3);
  border-top-color: var(--color-error);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
}

@keyframes spin {
  from {
    transform: rotate(0deg);
  }
  to {
    transform: rotate(360deg);
  }
}

/* ===================================================================
   17. ERROR STATE STYLING
   =================================================================== */

/* Error indicator for invalid filters */
.filter-select.error,
.filter-category.error,
.filter-industry.error,
.filter-department.error,
.filter-framework.error {
  border-color: var(--color-error);
  background-color: rgba(255, 80, 80, 0.04);
}

.filter-select.error:focus,
.filter-category.error:focus {
  box-shadow: 0 0 0 3px rgba(255, 80, 80, 0.15);
}

/* Error message display */
.filter-error-message {
  font-size: var(--font-size-sm);
  color: var(--color-error);
  margin-top: var(--spacing-1);
  display: none;
}

.filter-select.error ~ .filter-error-message {
  display: block;
}

/* ===================================================================
   18. CUSTOM SCROLLBAR IN DROPDOWNS
   =================================================================== */

select::-webkit-scrollbar {
  width: 8px;
}

select::-webkit-scrollbar-track {
  background: transparent;
}

select::-webkit-scrollbar-thumb {
  background: var(--color-primary);
  border-radius: var(--radius-full);
}

select::-webkit-scrollbar-thumb:hover {
  background: var(--color-primary-dark);
}