/**
 * Modal Component Styles - AI Services Blog
 * Side popup modal for displaying detailed service information
 * 
 * Features:
 * - Dark semi-transparent overlay with backdrop blur
 * - Right-sliding panel animation (300ms)
 * - Responsive sizing: 600px desktop, 90% max mobile
 * - Smooth transitions and animations
 * - Accessible focus management
 * - Mobile-first responsive design
 * - Content sections with typography hierarchy
 * - Metadata badges with color coding
 * - Related services grid
 * - CTA button with hover effects
 * 
 * Requirements: 5.1-5.13, 10.1-10.6
 */

/* ===================================================================
   1. MODAL OVERLAY - Background & Backdrop
   =================================================================== */

.modal-overlay {
  position: fixed;
  top: 0;
  right: 0;
  bottom: 0;
  left: 0;
  background: rgba(0, 0, 0, 0.6);
  backdrop-filter: blur(4px);
  -webkit-backdrop-filter: blur(4px);
  z-index: var(--z-modal-backdrop);
  opacity: 0;
  visibility: hidden;
  transition: opacity var(--transition-base) ease,
              visibility var(--transition-base) ease;
  
  /* Prevent scrolling when modal is open */
  &.active {
    opacity: 1;
    visibility: visible;
  }
}

/* Block body scroll when modal is active */
body.modal-open {
  overflow: hidden;
  -webkit-overflow-scrolling: touch;
}

/* ===================================================================
   2. MODAL CONTAINER - Main Panel Structure
   =================================================================== */

.modal-container {
  position: fixed;
  top: 0;
  right: 0;
  bottom: 0;
  width: 600px;
  max-width: 90%;
  background: var(--bg-primary);
  box-shadow: -4px 0 24px rgba(0, 0, 0, 0.2);
  border-radius: 0;
  z-index: var(--z-modal);
  transform: translateX(100%);
  transition: transform var(--transition-slower) cubic-bezier(0.17, 0.85, 0.438, 0.99);
  overflow-y: auto;
  overflow-x: hidden;
  -webkit-overflow-scrolling: touch;
  display: flex;
  flex-direction: column;
  
  /* Smooth slide-in when modal is active */
  .modal-overlay.active & {
    transform: translateX(0);
  }
}

/* Custom scrollbar for modal content */
.modal-container::-webkit-scrollbar {
  width: 8px;
}

.modal-container::-webkit-scrollbar-track {
  background: var(--bg-secondary);
  border-radius: var(--radius-base);
}

.modal-container::-webkit-scrollbar-thumb {
  background: var(--color-primary);
  border-radius: var(--radius-full);
  
  &:hover {
    background: var(--color-primary-dark);
  }
}

/* ===================================================================
   3. MODAL HEADER - Title & Close Button
   =================================================================== */

.modal-header {
  position: relative;
  padding: var(--spacing-6);
  border-bottom: 1px solid var(--color-border-gray);
  background: var(--bg-primary);
  flex-shrink: 0;
}

.modal-service-name {
  font-size: var(--font-size-4xl);
  font-weight: var(--font-weight-bold);
  color: var(--text-primary);
  line-height: var(--line-height-tight);
  margin: 0 0 var(--spacing-4) 0;
  word-wrap: break-word;
  overflow-wrap: break-word;
  hyphens: auto;
  
  @media (max-width: 768px) {
    font-size: var(--font-size-2xl);
    margin-bottom: var(--spacing-3);
  }
}

/* ===================================================================
   4. MODAL META BADGES
   =================================================================== */

.modal-meta {
  display: flex;
  flex-wrap: wrap;
  gap: var(--spacing-2);
  margin-top: var(--spacing-3);
  
  @media (max-width: 768px) {
    gap: var(--spacing-1);
  }
}

.badge {
  display: inline-block;
  padding: var(--spacing-2) var(--spacing-3);
  font-size: var(--font-size-xs);
  font-weight: var(--font-weight-semibold);
  text-transform: uppercase;
  letter-spacing: 0.5px;
  border-radius: var(--radius-full);
  white-space: nowrap;
  transition: all var(--transition-base);
  
  @media (max-width: 480px) {
    padding: var(--spacing-1) var(--spacing-2);
    font-size: 10px;
  }
}

/* Badge Categories */
.badge-category {
  background: rgba(255, 31, 142, 0.1);
  color: var(--color-primary);
  border: 1px solid var(--color-primary);
  
  &:hover {
    background: rgba(255, 31, 142, 0.2);
  }
}

.badge-industry {
  background: rgba(79, 77, 175, 0.1);
  color: var(--color-secondary);
  border: 1px solid var(--color-secondary);
  
  &:hover {
    background: rgba(79, 77, 175, 0.2);
  }
}

.badge-department {
  background: rgba(0, 186, 255, 0.1);
  color: var(--color-accent);
  border: 1px solid var(--color-accent);
  
  &:hover {
    background: rgba(0, 186, 255, 0.2);
  }
}

.badge-framework {
  background: rgba(139, 195, 74, 0.1);
  color: var(--color-success);
  border: 1px solid var(--color-success);
  
  &:hover {
    background: rgba(139, 195, 74, 0.2);
  }
}

/* ===================================================================
   5. MODAL CLOSE BUTTON
   =================================================================== */

.modal-close {
  position: absolute;
  top: var(--spacing-6);
  right: var(--spacing-6);
  width: 40px;
  height: 40px;
  padding: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  background: transparent;
  border: none;
  border-radius: var(--radius-full);
  color: var(--text-secondary);
  font-size: var(--font-size-xl);
  cursor: pointer;
  transition: all var(--transition-base);
  z-index: 10;
  
  &:hover {
    background: var(--bg-secondary);
    color: var(--text-primary);
    transform: scale(1.1);
  }
  
  &:focus {
    outline: 2px solid var(--color-accent);
    outline-offset: 2px;
    background: var(--bg-secondary);
  }
  
  &:active {
    transform: scale(0.95);
  }
  
  i {
    display: block;
    line-height: 1;
  }
  
  @media (max-width: 768px) {
    top: var(--spacing-4);
    right: var(--spacing-4);
    width: 36px;
    height: 36px;
  }
}

/* ===================================================================
   6. MODAL CONTENT - Main scrollable area
   =================================================================== */

.modal-content {
  flex: 1;
  overflow-y: auto;
  overflow-x: hidden;
}

.modal-body {
  padding: var(--spacing-6);
  
  @media (max-width: 768px) {
    padding: var(--spacing-4);
  }
}

/* ===================================================================
   7. MODAL SECTIONS - Content blocks
   =================================================================== */

.modal-section {
  margin-bottom: var(--spacing-8);
  
  &:last-child {
    margin-bottom: var(--spacing-6);
  }
  
  @media (max-width: 768px) {
    margin-bottom: var(--spacing-6);
    
    &:last-child {
      margin-bottom: var(--spacing-4);
    }
  }
}

/* ===================================================================
   8. MODAL SECTION HEADINGS - H3 with border/divider
   =================================================================== */

.section-heading {
  font-size: var(--font-size-2xl);
  font-weight: var(--font-weight-bold);
  color: var(--text-primary);
  line-height: var(--line-height-tight);
  margin: 0 0 var(--spacing-4) 0;
  padding-bottom: var(--spacing-3);
  border-bottom: 2px solid var(--color-border-gray);
  position: relative;
  
  @media (max-width: 768px) {
    font-size: var(--font-size-xl);
    margin-bottom: var(--spacing-3);
    padding-bottom: var(--spacing-2);
  }
}

/* Gradient underline effect on section headings */
.section-heading::after {
  content: '';
  position: absolute;
  bottom: -2px;
  left: 0;
  width: 40px;
  height: 2px;
  background: linear-gradient(90deg, 
    var(--color-primary) 0%, 
    var(--color-secondary) 50%, 
    var(--color-accent) 100%);
  border-radius: var(--radius-full);
}

/* ===================================================================
   9. MODAL CONTENT TYPOGRAPHY
   =================================================================== */

.modal-section p {
  font-size: var(--font-size-base);
  line-height: var(--line-height-relaxed);
  color: var(--text-secondary);
  margin-bottom: var(--spacing-4);
  
  &:last-child {
    margin-bottom: 0;
  }
  
  @media (max-width: 768px) {
    font-size: var(--font-size-sm);
    line-height: 1.6;
  }
}

/* Emphasized text within modal */
.modal-section strong {
  color: var(--text-primary);
  font-weight: var(--font-weight-bold);
}

.modal-section em {
  color: var(--color-primary);
  font-style: italic;
}

/* Lists within modal */
.modal-section ul,
.modal-section ol {
  margin: var(--spacing-3) 0 var(--spacing-4);
  padding-left: var(--spacing-6);
}

.modal-section li {
  margin-bottom: var(--spacing-2);
  line-height: var(--line-height-relaxed);
  color: var(--text-secondary);
}

/* ===================================================================
   10. MODAL CTA BUTTON - Primary call-to-action
   =================================================================== */

.modal-cta {
  margin: var(--spacing-8) 0;
  padding: var(--spacing-6) 0;
  border-top: 1px solid var(--color-border-gray);
  border-bottom: 1px solid var(--color-border-gray);
  
  @media (max-width: 768px) {
    margin: var(--spacing-6) 0;
    padding: var(--spacing-4) 0;
  }
}

.btn-primary-cta {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--spacing-3);
  width: 100%;
  padding: var(--spacing-4) var(--spacing-6);
  background: linear-gradient(135deg, 
    var(--color-primary) 0%, 
    var(--color-primary-dark) 100%);
  color: white;
  font-size: var(--font-size-base);
  font-weight: var(--font-weight-bold);
  border: none;
  border-radius: var(--radius-full);
  text-decoration: none;
  cursor: pointer;
  transition: all var(--transition-base);
  text-align: center;
  min-height: 48px;
  position: relative;
  overflow: hidden;
  
  /* Gradient overlay on hover */
  &::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: rgba(255, 255, 255, 0.2);
    transition: left var(--transition-base);
    z-index: 1;
  }
  
  &:hover {
    transform: translateY(-2px);
    box-shadow: 0 10px 20px rgba(255, 31, 142, 0.3);
    
    &::before {
      left: 100%;
    }
  }
  
  &:active {
    transform: translateY(0);
  }
  
  &:focus {
    outline: 2px solid var(--color-accent);
    outline-offset: 2px;
  }
  
  i {
    font-size: var(--font-size-base);
    transition: transform var(--transition-base);
    margin-left: var(--spacing-2);
  }
  
  &:hover i {
    transform: translateX(4px);
  }
  
  @media (max-width: 768px) {
    font-size: var(--font-size-sm);
    padding: var(--spacing-3) var(--spacing-5);
    min-height: 44px;
  }
}

/* ===================================================================
   11. RELATED SERVICES SECTION
   =================================================================== */

.related-services {
  padding-top: var(--spacing-6);
  border-top: 1px solid var(--color-border-gray);
}

.related-services-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(120px, 1fr));
  gap: var(--spacing-4);
  margin-top: var(--spacing-4);
  
  @media (max-width: 768px) {
    grid-template-columns: repeat(2, 1fr);
    gap: var(--spacing-3);
  }
}

.related-service-card {
  padding: var(--spacing-3);
  background: var(--bg-secondary);
  border: 1px solid var(--color-border-gray);
  border-radius: var(--radius-lg);
  cursor: pointer;
  transition: all var(--transition-base);
  text-align: center;
  display: flex;
  flex-direction: column;
  gap: var(--spacing-2);
  
  &:hover {
    background: var(--bg-tertiary);
    border-color: var(--color-primary);
    transform: translateY(-4px);
    box-shadow: 0 8px 16px rgba(0, 0, 0, 0.1);
  }
  
  &:focus {
    outline: 2px solid var(--color-accent);
    outline-offset: 2px;
  }
}

.related-service-name {
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-semibold);
  color: var(--text-primary);
  line-height: var(--line-height-tight);
  margin: 0;
  
  @media (max-width: 480px) {
    font-size: var(--font-size-xs);
  }
}

.related-service-category {
  font-size: var(--font-size-xs);
  color: var(--text-light);
  text-transform: uppercase;
  letter-spacing: 0.5px;
  margin: 0;
}

/* ===================================================================
   12. MODAL ANIMATIONS & TRANSITIONS
   =================================================================== */

/* Slide-in animation keyframes */
@keyframes slideInRight {
  from {
    transform: translateX(100%);
    opacity: 0;
  }
  to {
    transform: translateX(0);
    opacity: 1;
  }
}

/* Slide-out animation keyframes */
@keyframes slideOutRight {
  from {
    transform: translateX(0);
    opacity: 1;
  }
  to {
    transform: translateX(100%);
    opacity: 0;
  }
}

/* Fade-in overlay animation */
@keyframes fadeInOverlay {
  from {
    opacity: 0;
  }
  to {
    opacity: 1;
  }
}

/* Content fade-in animation */
@keyframes fadeInContent {
  from {
    opacity: 0;
    transform: translateY(10px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* Apply animations to modal content */
.modal-overlay.active {
  animation: fadeInOverlay var(--transition-base) ease;
}

.modal-overlay.active .modal-container {
  animation: slideInRight var(--transition-slower) cubic-bezier(0.17, 0.85, 0.438, 0.99);
}

.modal-header,
.modal-section {
  animation: fadeInContent var(--transition-base) ease 200ms backwards;
}

.modal-section:nth-child(2) { animation-delay: 250ms; }
.modal-section:nth-child(3) { animation-delay: 300ms; }
.modal-section:nth-child(4) { animation-delay: 350ms; }
.modal-section:nth-child(5) { animation-delay: 400ms; }
.modal-section:nth-child(6) { animation-delay: 450ms; }

/* ===================================================================
   13. MODAL ACTIVE STATE
   =================================================================== */

.modal-overlay.active {
  display: flex;
  align-items: flex-end;
  
  @media (min-width: 768px) {
    align-items: stretch;
  }
}

/* ===================================================================
   14. RESPONSIVE DESIGN - MOBILE (< 768px)
   =================================================================== */

@media (max-width: 767.98px) {
  .modal-container {
    width: 100%;
    max-width: 100%;
    border-radius: 16px 16px 0 0;
    transform: translateY(100%);
    bottom: 0;
    right: 0;
    left: 0;
    max-height: 90vh;
    
    /* Slide up from bottom on mobile */
    .modal-overlay.active & {
      transform: translateY(0);
    }
  }
  
  .modal-header {
    padding: var(--spacing-4);
    border-radius: 16px 16px 0 0;
  }
  
  .modal-close {
    top: var(--spacing-4);
    right: var(--spacing-4);
  }
  
  .modal-service-name {
    font-size: var(--font-size-2xl);
    margin-bottom: var(--spacing-2);
  }
  
  .section-heading {
    font-size: var(--font-size-lg);
  }
  
  .modal-body {
    padding: var(--spacing-4);
  }
  
  .modal-meta {
    gap: var(--spacing-1);
  }
  
  .badge {
    font-size: 10px;
    padding: var(--spacing-1) var(--spacing-2);
  }
}

/* ===================================================================
   15. RESPONSIVE DESIGN - TABLET (768px - 1024px)
   =================================================================== */

@media (min-width: 768px) and (max-width: 1023.98px) {
  .modal-container {
    width: 60%;
    max-width: 90%;
  }
  
  .modal-header {
    padding: var(--spacing-5);
  }
  
  .modal-body {
    padding: var(--spacing-5);
  }
  
  .modal-service-name {
    font-size: var(--font-size-3xl);
  }
}

/* ===================================================================
   16. RESPONSIVE DESIGN - DESKTOP (>= 1024px)
   =================================================================== */

@media (min-width: 1024px) {
  .modal-container {
    width: 600px;
    max-width: 50%;
  }
  
  .modal-header {
    padding: var(--spacing-6);
  }
  
  .modal-body {
    padding: var(--spacing-6);
  }
  
  .modal-service-name {
    font-size: var(--font-size-4xl);
  }
}

/* ===================================================================
   17. ACCESSIBILITY - KEYBOARD & FOCUS MANAGEMENT
   =================================================================== */

/* Focus styles for keyboard navigation */
.modal-close:focus,
.btn-primary-cta:focus,
.related-service-card:focus {
  outline: 2px solid var(--color-accent);
  outline-offset: 2px;
}

/* Focus visible for keyboard users only */
:focus-visible {
  outline: 2px solid var(--color-accent);
  outline-offset: 2px;
}

/* Modal content scrolling - prevent scroll lock */
.modal-container {
  scroll-behavior: smooth;
}

/* ===================================================================
   18. PRINT STYLES - MODAL
   =================================================================== */

@media print {
  .modal-overlay,
  .modal-container,
  .modal-close {
    display: none !important;
  }
}

/* ===================================================================
   19. PERFORMANCE OPTIMIZATION
   =================================================================== */

/* GPU acceleration for smooth animations */
.modal-container {
  transform: translateX(100%);
  will-change: transform;
  transform-origin: right center;
}

.modal-overlay {
  will-change: opacity, visibility;
}

/* Reduce motion for users who prefer it */
@media (prefers-reduced-motion: reduce) {
  .modal-overlay,
  .modal-container,
  .modal-close,
  .btn-primary-cta,
  .related-service-card {
    transition: none;
    animation: none;
  }
  
  .modal-container {
    transform: translateX(100%);
  }
  
  .modal-overlay.active .modal-container {
    transform: translateX(0);
  }
  
  .btn-primary-cta:hover {
    transform: none;
  }
}

/* ===================================================================
   20. DARK MODE SUPPORT (future)
   =================================================================== */

@media (prefers-color-scheme: dark) {
  .modal-container {
    background: var(--bg-primary);
    box-shadow: -4px 0 24px rgba(0, 0, 0, 0.5);
  }
  
  .section-heading {
    border-bottom-color: rgba(230, 230, 230, 0.2);
  }
  
  .modal-header {
    border-bottom-color: rgba(230, 230, 230, 0.1);
  }
}

/* ===================================================================
   21. BROWSER-SPECIFIC FIXES
   =================================================================== */

/* Firefox scrollbar styling */
.modal-container {
  scrollbar-width: thin;
  scrollbar-color: var(--color-primary) var(--bg-secondary);
}

/* Safari specific */
@supports (-webkit-appearance: none) {
  .modal-container {
    -webkit-overflow-scrolling: touch;
  }
  
  .btn-primary-cta {
    -webkit-app-region: no-drag;
  }
}

/* Edge specific - disable animation for performance */
@supports (-ms-ime-align: auto) {
  .modal-container {
    transform: translateX(100%);
  }
}

/* ===================================================================
   22. LOADING & ERROR STATES
   =================================================================== */

/* Loading state for modal content */
.modal-loading {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 200px;
  
  .spinner {
    width: 40px;
    height: 40px;
    border: 4px solid var(--bg-secondary);
    border-top-color: var(--color-primary);
    border-radius: 50%;
    animation: spin 1s linear infinite;
  }
}

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

/* Error state for modal */
.modal-error {
  padding: var(--spacing-6);
  background: rgba(255, 80, 80, 0.05);
  border: 1px solid var(--color-error);
  border-radius: var(--radius-lg);
  color: var(--color-error);
  text-align: center;
}

/* ===================================================================
   23. UTILITY CLASSES FOR MODAL
   =================================================================== */

/* Hide scrollbar while showing content */
.modal-container.hide-scrollbar {
  scrollbar-width: none;
  -ms-overflow-style: none;
}

.modal-container.hide-scrollbar::-webkit-scrollbar {
  display: none;
}

/* Prevent body scroll overflow */
body.modal-open {
  overflow-y: hidden;
  
  @media (max-width: 768px) {
    position: fixed;
    width: 100%;
  }
}