/**
 * Card Components - Mindeck Platform
 * Reusable card styles with variants and hover effects
 * Requirements: 3.3, 5.2, 6.1, 6.3
 */

/* ============================================
   BASE CARD STYLES
   ============================================ */

.card {
  /* Layout */
  display: flex;
  flex-direction: column;
  position: relative;
  
  /* Background and borders */
  background-color: var(--bg-elevated);
  border-radius: var(--radius-lg);
  
  /* Spacing */
  padding: var(--space-6);
  
  /* Shadow for elevation */
  box-shadow: var(--shadow-sm);
  
  /* Smooth transitions */
  transition: 
    box-shadow var(--transition-base),
    transform var(--transition-base),
    border-color var(--transition-base);
  
  /* Prevent content overflow */
  overflow: hidden;
}

/* ============================================
   CARD VARIANTS
   ============================================ */

/* Default Card - Subtle elevation */
.card-default {
  box-shadow: var(--shadow-sm);
}

.card-default:hover {
  box-shadow: var(--shadow-md);
  transform: translateY(-2px);
}

/* Elevated Card - Higher elevation */
.card-elevated {
  box-shadow: var(--shadow-md);
}

.card-elevated:hover {
  box-shadow: var(--shadow-lg);
  transform: translateY(-2px);
}

/* Outlined Card - Border instead of shadow */
.card-outlined {
  box-shadow: none;
  border: 1px solid var(--border-primary);
}

.card-outlined:hover {
  border-color: var(--interactive-primary);
  box-shadow: var(--shadow-sm);
  transform: translateY(-2px);
}

/* Flat Card - No elevation */
.card-flat {
  box-shadow: none;
  background-color: var(--bg-secondary);
}

.card-flat:hover {
  background-color: var(--bg-tertiary);
}

/* ============================================
   CARD SECTIONS
   ============================================ */

/* Card Header */
.card-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: var(--space-4);
  padding-bottom: var(--space-4);
  border-bottom: 1px solid var(--border-secondary);
}

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

.card-header-subtitle {
  font-size: var(--font-size-sm);
  color: var(--text-secondary);
  margin: var(--space-1) 0 0 0;
}

/* Card Body */
.card-body {
  flex: 1;
  color: var(--text-secondary);
  line-height: var(--line-height-relaxed);
}

.card-body p {
  margin: 0 0 var(--space-4) 0;
}

.card-body p:last-child {
  margin-bottom: 0;
}

/* Card Footer */
.card-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-top: var(--space-4);
  padding-top: var(--space-4);
  border-top: 1px solid var(--border-secondary);
}

/* ============================================
   CARD SIZES
   ============================================ */

/* Compact Card */
.card-compact {
  padding: var(--space-4);
}

.card-compact .card-header {
  margin-bottom: var(--space-3);
  padding-bottom: var(--space-3);
}

.card-compact .card-footer {
  margin-top: var(--space-3);
  padding-top: var(--space-3);
}

/* Default Card (already defined in base) */
.card-default-size {
  padding: var(--space-6);
}

/* Spacious Card */
.card-spacious {
  padding: var(--space-8);
}

.card-spacious .card-header {
  margin-bottom: var(--space-6);
  padding-bottom: var(--space-6);
}

.card-spacious .card-footer {
  margin-top: var(--space-6);
  padding-top: var(--space-6);
}

/* ============================================
   INTERACTIVE CARDS
   ============================================ */

/* Clickable Card */
.card-clickable {
  cursor: pointer;
  user-select: none;
}

.card-clickable:active {
  transform: translateY(0);
  box-shadow: var(--shadow-xs);
}

/* Link Card - Entire card is a link */
a.card {
  text-decoration: none;
  color: inherit;
}

a.card:focus-visible {
  outline: 2px solid var(--border-focus);
  outline-offset: 2px;
}

/* ============================================
   CARD WITH MEDIA
   ============================================ */

/* Card with image */
.card-media {
  padding: 0;
}

.card-media-image {
  width: 100%;
  height: auto;
  display: block;
  border-radius: var(--radius-lg) var(--radius-lg) 0 0;
}

.card-media-content {
  padding: var(--space-6);
}

/* Horizontal card with media */
.card-horizontal {
  flex-direction: row;
}

.card-horizontal .card-media-image {
  width: 40%;
  height: 100%;
  object-fit: cover;
  border-radius: var(--radius-lg) 0 0 var(--radius-lg);
}

.card-horizontal .card-media-content {
  flex: 1;
}

/* ============================================
   CARD GRID LAYOUTS
   ============================================ */

.card-grid {
  display: grid;
  gap: var(--space-6);
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
}

.card-grid-2 {
  grid-template-columns: repeat(2, 1fr);
}

.card-grid-3 {
  grid-template-columns: repeat(3, 1fr);
}

.card-grid-4 {
  grid-template-columns: repeat(4, 1fr);
}

/* ============================================
   SEMANTIC CARD VARIANTS
   ============================================ */

/* Success Card */
.card-success {
  border-left: 4px solid var(--color-success-500);
}

.card-success .card-header-title {
  color: var(--color-success-700);
}

/* Warning Card */
.card-warning {
  border-left: 4px solid var(--color-warning-500);
}

.card-warning .card-header-title {
  color: var(--color-warning-700);
}

/* Error Card */
.card-error {
  border-left: 4px solid var(--color-error-500);
}

.card-error .card-header-title {
  color: var(--color-error-700);
}

/* Info Card */
.card-info {
  border-left: 4px solid var(--color-info-500);
}

.card-info .card-header-title {
  color: var(--color-info-700);
}

/* ============================================
   CARD STATES
   ============================================ */

/* Loading State */
.card-loading {
  position: relative;
  pointer-events: none;
}

.card-loading::after {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background-color: var(--bg-overlay);
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-lg);
}

/* Disabled State */
.card-disabled {
  opacity: 0.6;
  pointer-events: none;
  cursor: not-allowed;
}

/* ============================================
   CARD BADGES AND LABELS
   ============================================ */

.card-badge {
  position: absolute;
  top: var(--space-4);
  right: var(--space-4);
  padding: var(--space-1) var(--space-3);
  background-color: var(--interactive-primary);
  color: var(--text-inverse);
  font-size: var(--font-size-xs);
  font-weight: var(--font-weight-semibold);
  border-radius: var(--radius-full);
  text-transform: uppercase;
  letter-spacing: var(--letter-spacing-wide);
}

/* ============================================
   ACCESSIBILITY ENHANCEMENTS
   ============================================ */

/* Reduced motion support */
@media (prefers-reduced-motion: reduce) {
  .card {
    transition: none;
  }
  
  .card:hover,
  .card-default:hover,
  .card-elevated:hover,
  .card-outlined:hover {
    transform: none;
  }
}

/* High contrast mode support */
@media (prefers-contrast: high) {
  .card {
    border: 2px solid var(--border-primary);
  }
}

/* Focus visible for keyboard navigation */
.card:focus-visible,
.card-clickable:focus-visible {
  outline: 2px solid var(--border-focus);
  outline-offset: 2px;
}

/* ============================================
   RESPONSIVE ADJUSTMENTS
   ============================================ */

/* Mobile (320px - 767px) */
@media (max-width: 767px) {
  .card {
    padding: var(--space-4);
  }
  
  .card-spacious {
    padding: var(--space-6);
  }
  
  .card-grid {
    grid-template-columns: 1fr;
    gap: var(--space-4);
  }
  
  .card-grid-2,
  .card-grid-3,
  .card-grid-4 {
    grid-template-columns: 1fr;
  }
  
  .card-horizontal {
    flex-direction: column;
  }
  
  .card-horizontal .card-media-image {
    width: 100%;
    height: auto;
    border-radius: var(--radius-lg) var(--radius-lg) 0 0;
  }
}

/* Tablet (768px - 1023px) */
@media (min-width: 768px) and (max-width: 1023px) {
  .card-grid-3,
  .card-grid-4 {
    grid-template-columns: repeat(2, 1fr);
  }
}

/* Desktop (1024px and above) */
@media (min-width: 1024px) {
  .card-grid {
    gap: var(--space-8);
  }
}