/**
 * Course Cards Component - Aprender21 2025
 * Minimalist, professional card design for course listings
 * Replaces legacy table-based layout in template-listado.php
 */

/* ========== GLOBAL IMAGE RESPONSIVE FIX ========== */
/* Ensures all images are responsive and don't overflow containers */
/* This overrides Bootstrap's default which lacks max-width */
img {
  max-width: 100%;
  height: auto;
}

/* ========== COURSE GRID CONTAINER ========== */

.course-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: var(--space-6, 1.5rem);
  padding: var(--space-4, 1rem) 0;
}

/* Single column on mobile */
@media (max-width: 600px) {
  .course-grid {
    grid-template-columns: 1fr;
    gap: var(--space-4, 1rem);
  }
}

/* ========== CATEGORY HEADER ========== */

.category-header {
  display: flex;
  align-items: center;
  gap: var(--space-4, 1rem);
  padding: var(--space-5, 1.25rem);
  margin: var(--space-6, 1.5rem) 0 var(--space-4, 1rem) 0;
  background: linear-gradient(135deg, #f8fafc 0%, #f1f5f9 100%);
  border-radius: var(--radius-lg, 0.75rem);
  border-left: 4px solid #3A8AAB;
}

.category-header__icon {
  width: 60px;
  height: 60px;
  border-radius: var(--radius-md, 0.5rem);
  object-fit: cover;
  flex-shrink: 0;
}

.category-header__content {
  flex: 1;
}

.category-header__title {
  margin: 0 0 var(--space-2, 0.5rem) 0;
  font-size: var(--font-size-xl, 1.25rem);
  font-weight: var(--font-weight-bold, 700);
  color: var(--color-gray-900, #111827);
}

.category-header__title a {
  color: inherit;
  text-decoration: none;
  transition: color 0.2s ease;
}

.category-header__title a:hover {
  color: #3A8AAB;
}

.category-header__description {
  margin: 0;
  font-size: var(--font-size-sm, 0.875rem);
  color: var(--color-gray-600, #4b5563);
  line-height: 1.5;
}

/* Subcategory header - slightly smaller */
.category-header--sub {
  margin-left: var(--space-4, 1rem);
  border-left-color: #2c5f7c;
  background: linear-gradient(135deg, #f1f5f9 0%, #e2e8f0 100%);
}

.category-header--sub .category-header__title {
  font-size: var(--font-size-lg, 1.125rem);
}

/* Hide icon on mobile */
@media (max-width: 450px) {
  .category-header__icon {
    display: none;
  }
}

/* ========== COURSE CARD ========== */

.course-card {
  position: relative;
  display: flex;
  flex-direction: column;
  background: #ffffff;
  border-radius: var(--radius-lg, 0.75rem);
  border: 1px solid var(--color-gray-200, #e5e7eb);
  overflow: hidden;
  transition: all 0.3s ease;
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.05);
}

.course-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 10px 25px rgba(0, 0, 0, 0.1);
  border-color: var(--color-primary-200, #bfdbfe);
}

/* Clickable card link wrapper */
.course-card__link {
  display: flex;
  flex-direction: column;
  height: 100%;
  text-decoration: none;
  color: inherit;
}

.course-card__link:hover {
  text-decoration: none;
}

/* ========== CARD IMAGE ========== */

.course-card__image {
  position: relative;
  width: 100%;
  aspect-ratio: 16 / 10;
  overflow: hidden;
  background: linear-gradient(135deg, #f1f5f9 0%, #e2e8f0 100%);
  margin: 0;
}

.course-card__image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.3s ease;
  margin: 0;
}

.course-card:hover .course-card__image img {
  transform: scale(1.05);
}

/* Fallback icon styling (when using 64x64 icons) */
.course-card__image--icon {
  display: flex;
  align-items: center;
  justify-content: center;
  background: linear-gradient(135deg, #3A8AAB 0%, #2c5f7c 100%);
}

.course-card__image--icon img {
  width: 80px;
  height: 80px;
  object-fit: contain;
}

/* ========== TYPE BADGE ========== */

.course-card__badge {
  position: absolute;
  top: var(--space-3, 0.75rem);
  left: var(--space-3, 0.75rem);
  padding: var(--space-1, 0.25rem) var(--space-3, 0.75rem);
  font-size: var(--font-size-xs, 0.75rem);
  font-weight: var(--font-weight-semibold, 600);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  border-radius: var(--radius-md, 0.5rem);
  color: #ffffff;
  z-index: 1;
}

.course-card__badge--experto {
  background: #3A8AAB;
}

.course-card__badge--semiexperto {
  background: #2c5f7c;
}

.course-card__badge--curso {
  background: #16a34a;
}

/* ========== CARD CONTENT ========== */

.course-card__content {
  display: flex;
  flex-direction: column;
  flex: 1;
  padding: var(--space-4, 1rem);
}

.course-card__title {
  margin: 0 0 var(--space-2, 0.5rem) 0;
  font-size: var(--font-size-xl, 1.4rem);
  font-weight: var(--font-weight-semibold, 600);
  color: var(--color-gray-900, #111827);
  line-height: 1.4;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.course-card:hover .course-card__title {
  color: #3A8AAB;
}

.course-card__description {
  margin: 0;
  font-size: var(--font-size-md, 1.1rem);
  color: var(--color-gray-600, #4b5563);
  line-height: 1.6;
  display: -webkit-box;
  -webkit-line-clamp: 3;
  -webkit-box-orient: vertical;
  overflow: hidden;
  flex: 1;
}

/* ========== CARD META (Duration, Mode) ========== */

.course-card__meta {
  display: flex;
  align-items: center;
  gap: var(--space-3, 0.75rem);
  margin-top: var(--space-3, 0.75rem);
  padding-top: var(--space-3, 0.75rem);
  border-top: 1px solid var(--color-gray-100, #f3f4f6);
}

.course-card__duration,
.course-card__mode {
  display: inline-flex;
  align-items: center;
  gap: var(--space-1, 0.25rem);
  font-size: var(--font-size-base, 1rem);
  color: var(--color-gray-500, #6b7280);
}

.course-card__duration::before {
  content: "📅";
  font-size: 0.875rem;
}

.course-card__mode::before {
  content: "💻";
  font-size: 0.875rem;
}

/* ========== ANIMATIONS ========== */

@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(20px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.course-card {
  animation: fadeInUp 0.4s ease forwards;
}

/* Staggered animation */
.course-grid .course-card:nth-child(1) { animation-delay: 0s; }
.course-grid .course-card:nth-child(2) { animation-delay: 0.05s; }
.course-grid .course-card:nth-child(3) { animation-delay: 0.1s; }
.course-grid .course-card:nth-child(4) { animation-delay: 0.15s; }
.course-grid .course-card:nth-child(5) { animation-delay: 0.2s; }
.course-grid .course-card:nth-child(6) { animation-delay: 0.25s; }

/* Reduced motion */
@media (prefers-reduced-motion: reduce) {
  .course-card {
    animation: none;
    transition: none;
  }
  
  .course-card:hover {
    transform: none;
  }
  
  .course-card__image img {
    transition: none;
  }
  
  .course-card:hover .course-card__image img {
    transform: none;
  }
}

/* ========== LOADING SKELETON ========== */

.course-card--loading {
  pointer-events: none;
}

.course-card--loading .course-card__image,
.course-card--loading .course-card__title,
.course-card--loading .course-card__description {
  background: linear-gradient(90deg, #f1f5f9 25%, #e2e8f0 50%, #f1f5f9 75%);
  background-size: 200% 100%;
  animation: shimmer 1.5s infinite;
  border-radius: var(--radius-md, 0.5rem);
}

.course-card--loading .course-card__title {
  height: 1.5rem;
  width: 80%;
}

.course-card--loading .course-card__description {
  height: 3rem;
  width: 100%;
}

@keyframes shimmer {
  0% { background-position: 200% 0; }
  100% { background-position: -200% 0; }
}