/* ==========================================
   ESPECIALIZACIONES - LISTADO
   Paleta Corporativa - 100% Consistente
   ========================================== */

:root {
  /* Colores Corporativos */
  --color-primary: #02408f;
  --color-secondary: #02b8eb;
  --color-accent: #ff9923;
  --color-neutral: #e8e8e8;
  
  /* Gradientes */
  --gradient-primary: linear-gradient(135deg, #02408f 0%, #02b8eb 100%);
  --gradient-accent: linear-gradient(135deg, #ff9923 0%, #ff7b00 100%);
  
  /* Texto */
  --text-primary: #1a1a1a;
  --text-secondary: #4a4a4a;
  --text-tertiary: #6b7280;
  
  /* Sombras */
  --shadow-xs: 0 1px 3px rgba(2, 64, 143, 0.08);
  --shadow-sm: 0 2px 8px rgba(2, 64, 143, 0.1);
  --shadow-md: 0 4px 12px rgba(2, 64, 143, 0.12);
  --shadow-hover: 0 8px 20px rgba(2, 184, 235, 0.15);
  
  /* Radios */
  --radius: 8px;
  --radius-sm: 6px;
  --radius-full: 999px;
  
  /* Transiciones */
  --transition: all 0.2s ease;
}

/* ============================================
   PAGE HEADER - HERO ESPECIALIZACIONES
============================================ */

.page-header {
  padding: 32px 0;
  background: var(--gradient-primary);
  color: #ffffff;
  position: relative;
  overflow: hidden;
}

/* Patrón decorativo radial */
.page-header::before {
  content: '';
  position: absolute;
  inset: 0;
  background: radial-gradient(circle at 20% 50%, rgba(2, 184, 235, 0.15) 0%, transparent 50%);
  opacity: 0.6;
}

.page-header .container {
  position: relative;
  z-index: 1;
  max-width: 1000px;
}

.page-header h1 {
  font-size: clamp(1.5rem, 3.5vw, 2rem);
  font-weight: 800;
  margin: 0 0 10px;
  color: #ffffff;
  line-height: 1.2;
  letter-spacing: -0.02em;
  text-shadow: 0 2px 8px rgba(0, 0, 0, 0.2);
  display: flex;
  align-items: center;
  gap: 12px;
}

.page-header h1 i {
  font-size: 1.8rem;
  color: var(--color-accent);
  filter: drop-shadow(0 2px 4px rgba(0, 0, 0, 0.2));
}

.page-header p {
  max-width: 680px;
  margin: 0;
  font-size: 0.9rem;
  color: rgba(255, 255, 255, 0.95);
  line-height: 1.6;
}

/* ============================================
   GRID DE ESPECIALIZACIONES
============================================ */

.cursos-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 20px;
  margin-top: 32px;
}

/* ============================================
   CARD DE ESPECIALIZACIÓN
============================================ */

.curso-card {
  background: #ffffff;
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: var(--shadow-xs);
  border: 1px solid var(--color-neutral);
  cursor: pointer;
  transition: var(--transition);
  display: flex;
  flex-direction: column;
  position: relative;
  height: 100%;
}

/* Efecto radial sutil */
.curso-card::before {
  content: "";
  position: absolute;
  inset: 0;
  background: radial-gradient(circle at 0 0, rgba(2, 184, 235, 0.08), transparent 55%);
  opacity: 0;
  transition: opacity 0.25s ease;
  pointer-events: none;
  z-index: 1;
}

.curso-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-hover);
  border-color: var(--color-secondary);
}

.curso-card:hover::before {
  opacity: 1;
}

/* ============================================
   IMAGEN DE ESPECIALIZACIÓN
============================================ */

.curso-imagen {
  position: relative;
  width: 100%;
  height: 200px;
  overflow: hidden;
  background: linear-gradient(135deg, #f3f4f6 0%, #e5e7eb 100%);
}

.curso-imagen img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.4s ease;
}

.curso-card:hover .curso-imagen img {
  transform: scale(1.08);
}

/* Placeholder sin imagen */
.curso-imagen .placeholder {
  width: 100%;
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--gradient-primary);
  color: #ffffff;
  font-size: 3.5rem;
  opacity: 0.9;
  transition: var(--transition);
}

.curso-card:hover .curso-imagen .placeholder {
  transform: scale(1.1) rotate(5deg);
}

/* ============================================
   BADGE DE PRECIO (COMPACTO Y PROFESIONAL)
============================================ */

.curso-precio-badge {
  position: absolute;
  top: 12px;
  right: 12px;
  background: rgba(2, 64, 143, 0.95);
  color: #ffffff;
  padding: 8px 12px;
  border-radius: var(--radius);
  font-size: 1rem;
  font-weight: 800;
  box-shadow: 0 4px 12px rgba(2, 64, 143, 0.4);
  backdrop-filter: blur(8px);
  z-index: 3;
  border: 1px solid rgba(255, 255, 255, 0.2);
  transition: var(--transition);
  line-height: 1.2;
}

.curso-precio-badge.gratis {
  background: linear-gradient(135deg, #10b981 0%, #059669 100%);
  box-shadow: 0 4px 12px rgba(16, 185, 129, 0.4);
  animation: pulse 2s ease-in-out infinite;
  display: flex;
  align-items: center;
  gap: 6px;
}

/* Badge rojo para descuentos - EN FILA */
.curso-precio-badge.descuento {
  background: linear-gradient(135deg, #ef4444 0%, #dc2626 100%);
  box-shadow: 0 4px 12px rgba(239, 68, 68, 0.4);
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 8px 14px;
}

/* Precio original tachado - EN LA MISMA LÍNEA */
.curso-precio-badge .precio-original {
  font-size: 0.75rem;
  text-decoration: line-through;
  opacity: 0.85;
  font-weight: 600;
  line-height: 1;
  color: rgba(255, 255, 255, 0.9);
}

@keyframes pulse {
  0%, 100% {
    transform: scale(1);
  }
  50% {
    transform: scale(1.05);
  }
}

/* Ajustes responsive para badges */
@media (max-width: 768px) {
  .curso-precio-badge {
    font-size: 0.9rem;
    padding: 6px 10px;
  }

  .curso-precio-badge.descuento {
    gap: 6px;
    padding: 6px 12px;
  }

  .curso-precio-badge .precio-original {
    font-size: 0.7rem;
  }
}

@media (max-width: 480px) {
  .curso-precio-badge {
    font-size: 0.85rem;
    padding: 5px 10px;
    top: 8px;
    right: 8px;
  }

  .curso-precio-badge.descuento {
    gap: 5px;
    padding: 5px 10px;
  }

  .curso-precio-badge .precio-original {
    font-size: 0.65rem;
  }
}


/* ============================================
   BADGES DE ESTADO (NUEVO / POPULAR)
============================================ */

.curso-badge {
  position: absolute;
  top: 12px;
  left: 12px;
  background: var(--gradient-accent);
  color: #ffffff;
  padding: 5px 12px;
  border-radius: var(--radius-full);
  font-size: 0.7rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.3px;
  box-shadow: 0 4px 12px rgba(255, 153, 35, 0.4);
  z-index: 3;
  display: flex;
  align-items: center;
  gap: 5px;
  border: 1px solid rgba(255, 255, 255, 0.3);
  animation: slideInLeft 0.5s ease-out;
}

.curso-badge i {
  font-size: 0.75rem;
}

/* Badge verde para "Nuevo" */
.curso-badge.nuevo {
  background: linear-gradient(135deg, #10b981 0%, #059669 100%);
  box-shadow: 0 4px 12px rgba(16, 185, 129, 0.4);
}

@keyframes slideInLeft {
  from {
    opacity: 0;
    transform: translateX(-20px);
  }
  to {
    opacity: 1;
    transform: translateX(0);
  }
}

/* ============================================
   CONTENIDO DE LA CARD
============================================ */

.curso-content {
  padding: 18px;
  flex: 1;
  display: flex;
  flex-direction: column;
  gap: 10px;
  position: relative;
  z-index: 2;
}

.curso-titulo {
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--text-primary);
  line-height: 1.4;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
  min-height: 56px;
  transition: color 0.2s ease;
}

.curso-card:hover .curso-titulo {
  color: var(--color-primary);
}

.curso-descripcion {
  font-size: 0.85rem;
  color: var(--text-secondary);
  line-height: 1.6;
  display: -webkit-box;
  -webkit-line-clamp: 3;
  -webkit-box-orient: vertical;
  overflow: hidden;
  flex: 1;
}

/* ============================================
   META INFORMACIÓN
============================================ */

.curso-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  padding-top: 10px;
  border-top: 1px solid var(--color-neutral);
  margin-top: auto;
}

.curso-meta .meta-item {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  font-size: 0.75rem;
  color: var(--text-tertiary);
  white-space: nowrap;
  transition: var(--transition);
}

.curso-meta .meta-item i {
  font-size: 0.8rem;
  color: var(--color-secondary);
  transition: var(--transition);
}

.curso-card:hover .curso-meta .meta-item {
  color: var(--text-secondary);
}

.curso-card:hover .curso-meta .meta-item i {
  color: var(--color-accent);
  transform: scale(1.08);
}

/* ============================================
   EMPTY STATE
============================================ */

.empty-state {
  text-align: center;
  padding: 70px 20px;
  max-width: 500px;
  margin: 0 auto;
  background: #ffffff;
  border-radius: var(--radius);
  box-shadow: var(--shadow-xs);
  border: 1px solid var(--color-neutral);
}

.empty-state i {
  font-size: 4.5rem;
  color: #d1d5db;
  opacity: 0.5;
  margin-bottom: 20px;
  display: block;
}

.empty-state h3 {
  font-size: 1.4rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 10px;
}

.empty-state p {
  font-size: 0.95rem;
  color: var(--text-secondary);
  line-height: 1.6;
  margin-bottom: 20px;
}

.empty-state .btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 12px 24px;
  background: var(--gradient-primary);
  color: #ffffff;
  border-radius: var(--radius);
  text-decoration: none;
  font-weight: 600;
  font-size: 0.9rem;
  transition: var(--transition);
  box-shadow: 0 4px 12px rgba(2, 64, 143, 0.3);
  border: none;
  cursor: pointer;
}

.empty-state .btn:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 16px rgba(2, 184, 235, 0.35);
}

.empty-state .btn i {
  font-size: 0.95rem;
}

/* ============================================
   ANIMACIONES DE ENTRADA
============================================ */

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

.curso-card {
  animation: fadeInUp 0.4s ease-out backwards;
}

.curso-card:nth-child(1) { animation-delay: 0.05s; }
.curso-card:nth-child(2) { animation-delay: 0.1s; }
.curso-card:nth-child(3) { animation-delay: 0.15s; }
.curso-card:nth-child(4) { animation-delay: 0.2s; }
.curso-card:nth-child(5) { animation-delay: 0.25s; }
.curso-card:nth-child(6) { animation-delay: 0.3s; }
.curso-card:nth-child(7) { animation-delay: 0.35s; }
.curso-card:nth-child(8) { animation-delay: 0.4s; }
.curso-card:nth-child(9) { animation-delay: 0.45s; }

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

@media (max-width: 1024px) {
  .cursos-grid {
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 18px;
  }
}

@media (max-width: 768px) {
  .page-header {
    padding: 24px 0;
  }

  .page-header h1 {
    font-size: 1.4rem;
    gap: 10px;
  }

  .page-header h1 i {
    font-size: 1.5rem;
  }

  .page-header p {
    font-size: 0.85rem;
  }

  .cursos-grid {
    grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
    gap: 16px;
    margin-top: 24px;
  }

  .curso-imagen {
    height: 180px;
  }

  /* Ajuste de badges en móvil */
  .curso-badge {
    font-size: 0.65rem;
    padding: 4px 10px;
    gap: 4px;
  }

  .curso-precio-badge {
    font-size: 0.8rem;
    padding: 5px 12px;
  }

  .precio-original {
    font-size: 0.65rem;
  }

  .empty-state {
    padding: 50px 20px;
  }

  .empty-state i {
    font-size: 3.5rem;
  }

  .empty-state h3 {
    font-size: 1.2rem;
  }
}

@media (max-width: 480px) {
  .page-header {
    padding: 20px 0;
  }

  .page-header h1 {
    font-size: 1.2rem;
    gap: 8px;
    flex-direction: column;
  }

  .page-header h1 i {
    font-size: 1.3rem;
  }

  .cursos-grid {
    grid-template-columns: 1fr;
    gap: 14px;
  }

  .curso-imagen {
    height: 200px;
  }

  .curso-content {
    padding: 14px;
  }

  .curso-titulo {
    font-size: 0.95rem;
    min-height: auto;
  }

  .curso-descripcion {
    font-size: 0.8rem;
  }

  .curso-meta {
    gap: 8px;
  }

  .curso-meta .meta-item {
    font-size: 0.7rem;
  }

  /* Badges más pequeños en móvil */
  .curso-badge {
    font-size: 0.6rem;
    padding: 3px 8px;
    top: 8px;
    left: 8px;
  }

  .curso-precio-badge {
    font-size: 0.75rem;
    padding: 4px 10px;
    top: 8px;
    right: 8px;
  }

  .empty-state {
    padding: 40px 16px;
  }

  .empty-state i {
    font-size: 3rem;
  }

  .empty-state h3 {
    font-size: 1.1rem;
  }
}

/* ============================================
   ACCESIBILIDAD
============================================ */

.curso-card:focus-visible {
  outline: 2px solid var(--color-secondary);
  outline-offset: 2px;
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    transition-duration: 0.01ms !important;
  }
}

/* ============================================
   LOADING STATE (OPCIONAL)
============================================ */

.curso-card.loading {
  opacity: 0.6;
  pointer-events: none;
}

.curso-card.loading::after {
  content: '';
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: 40px;
  height: 40px;
  border: 3px solid var(--color-neutral);
  border-top-color: var(--color-secondary);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
  z-index: 10;
}

@keyframes spin {
  to {
    transform: translate(-50%, -50%) rotate(360deg);
  }
}