:root {
  --er-primary: #3f51b5;
  --er-primary-dark: #303f9f;
  --er-primary-light: #c5cae9;
  --er-accent: #ff0000;
  --er-accent-dark: #f50057;
  --er-star-filled: #FFDF00;
  --er-star-empty: #e0e0e0;
  --er-success: #4CAF50;
  --er-warning: #FF9800;
  --er-error: #F44336;
  --er-text-primary: #212121;
  --er-text-secondary: #757575;
  --er-divider: #e0e0e0;
  --er-background: #f5f5f5;
  --er-card-bg: #ffffff;

  --er-spacing-xs: 4px;
  --er-spacing-sm: 8px;
  --er-spacing-md: 16px;
  --er-spacing-lg: 24px;
  --er-spacing-xl: 32px;

  --er-border-radius-sm: 4px;
  --er-border-radius-md: 8px;
  --er-border-radius-lg: 12px;
  --er-border-radius-circle: 50%;

  --er-shadow-sm: 0 1px 3px rgba(0,0,0,0.12), 0 1px 2px rgba(0,0,0,0.24);
  --er-shadow-md: 0 3px 6px rgba(0,0,0,0.16), 0 3px 6px rgba(0,0,0,0.23);
  --er-shadow-lg: 0 10px 20px rgba(0,0,0,0.19), 0 6px 6px rgba(0,0,0,0.23);

  --er-transition-fast: all 0.15s ease;
  --er-transition-medium: all 0.3s ease;
  --er-transition-slow: all 0.45s ease;
}

.er-library-container {
  max-width: 1200px;
  margin: 0 auto;
  padding: var(--er-spacing-xl);
  font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
  color: var(--er-text-primary);
}

.er-library-filters {
  display: flex;
  flex-wrap: wrap;
  gap: var(--er-spacing-md);
  margin-bottom: var(--er-spacing-xl);
  align-items: center;
}

.er-filter-search {
  flex: 1;
  min-width: 250px;
  display: flex;
  position: relative;
}

.er-search-input {
  flex: 1;
  padding: var(--er-spacing-sm) var(--er-spacing-md);
  border: 1px solid var(--er-divider);
  border-radius: var(--er-border-radius-md);
  font-size: 16px;
  transition: var(--er-transition-medium);
}

.er-search-input:focus {
  outline: none;
  border-color: var(--er-primary);
  box-shadow: 0 0 0 2px var(--er-primary-light);
}

.er-search-button {
  position: absolute;
  right: var(--er-spacing-sm);
  top: 50%;
  transform: translateY(-50%);
  background: none;
  border: none;
  color: var(--er-text-secondary);
  cursor: pointer;
  padding: var(--er-spacing-sm);
  transition: var(--er-transition-fast);
}

.er-search-button:hover {
  color: var(--er-primary);
}

.er-filter-dropdowns {
  display: flex;
  flex-wrap: wrap;
  gap: var(--er-spacing-md);
}

.er-filter-select {
  padding: var(--er-spacing-sm) var(--er-spacing-md);
  border: 1px solid var(--er-divider);
  border-radius: var(--er-border-radius-md);
  font-size: 14px;
  min-width: 200px;
  background-color: var(--er-card-bg);
  transition: var(--er-transition-medium);
}

.er-filter-select:focus {
  outline: none;
  border-color: var(--er-primary);
  box-shadow: 0 0 0 2px var(--er-primary-light);
}

/* Grid de recursos */
.er-resources-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--er-spacing-lg);
  margin-bottom: var(--er-spacing-xl);
}

.er-resource-card {
  background-color: var(--er-card-bg);
  border-radius: var(--er-border-radius-lg);
  overflow: hidden;
  box-shadow: var(--er-shadow-sm);
  transition: var(--er-transition-medium);
  display: flex;
  flex-direction: column;
}

.er-resource-card:hover {
  transform: translateY(-5px);
  box-shadow: var(--er-shadow-md);
}

.er-card-image-container {
  position: relative;
  width: 100%;
}

.er-card-image {
  position: relative;
  width: 100%;
  padding-bottom: 56.25%; 
  background-color: #f0f0f0;
  overflow: hidden;
}

.er-card-image img {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: var(--er-transition-slow);
}

.er-resource-card:hover .er-card-image img {
  transform: scale(1.05);
}

.er-card-badge {
  position: absolute;
  top: var(--er-spacing-md);
  left: var(--er-spacing-md);
  background-color: rgba(255, 255, 255, 0.9);
  padding: var(--er-spacing-xs) var(--er-spacing-md);
  border-radius: var(--er-border-radius-lg);
  font-size: 12px;
  font-weight: 600;
  color: var(--er-text-primary);
  box-shadow: var(--er-shadow-sm);
  backdrop-filter: blur(4px);
  z-index: 1;
}

.er-favorite-btn {
  position: absolute;
  top: var(--er-spacing-md);
  right: var(--er-spacing-md);
  width: 32px;
  height: 37px;
  background-color: rgba(255, 255, 255, 0.9);
  border: none;
  border-radius: var(--er-border-radius-circle);
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  color: var(--er-star-empty);
  transition: var(--er-transition-medium);
  box-shadow: var(--er-shadow-sm);
  backdrop-filter: blur(4px);
  z-index: 1;
}

.er-favorite-btn i {
  font-size: 17px; 
}

.er-favorite-btn.active, 
.er-favorite-btn:hover {
  color: var(--er-accent);
}

.er-card-content {
  padding: var(--er-spacing-md);
  flex-grow: 1;
  display: flex;
  flex-direction: column;
}

.er-card-title {
  margin: 0 0 var(--er-spacing-sm) 0;
  font-size: 18px;
  font-weight: 600;
  line-height: 1.4;
}

.er-card-title a {
  color: inherit;
  text-decoration: none;
  transition: var(--er-transition-fast);
}

.er-card-title a:hover {
  color: var(--er-primary);
}

.er-card-subtitle {
  margin: 0 0 var(--er-spacing-sm) 0;
  font-size: 14px;
  color: var(--er-text-secondary);
}

.er-card-meta {
  display: flex;
  flex-wrap: wrap;
  gap: var(--er-spacing-sm);
  margin-bottom: var(--er-spacing-md);
}

.er-card-meta-item {
  font-size: 12px;
  padding: var(--er-spacing-xs) var(--er-spacing-sm);
  border-radius: var(--er-border-radius-lg);
  background-color: var(--er-background);
  color: var(--er-text-secondary);
  display: flex;
  align-items: center;
  gap: var(--er-spacing-xs);
}

.er-official-rating {
  background-color: rgba(76, 175, 80, 0.1);
  color: var(--er-success);
}

.er-card-footer {
  margin-top: auto;
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding-top: var(--er-spacing-md);
  border-top: 1px solid var(--er-divider);
}

.er-user-rating {
  display: flex;
  align-items: center;
  gap: var(--er-spacing-xs);
}

.er-star-rating {
  display: flex;
  gap: 2px;
}

.er-star {
  color: var(--er-star-empty);
  cursor: pointer;
  transition: var(--er-transition-fast);
  font-size: 16px;
}

.er-star.filled, 
.er-star.hover {
  color: var(--er-star-filled);
}

.er-rating-count {
  font-size: 12px;
  color: var(--er-text-secondary);
}

.er-comments-link {
  font-size: 14px;
  color: var(--er-text-secondary);
  text-decoration: none;
  display: flex;
  align-items: center;
  gap: var(--er-spacing-xs);
  transition: var(--er-transition-fast);
}

.er-comments-link:hover {
  color: var(--er-primary);
}

.er-library-pagination {
  display: flex;
  justify-content: center;
  margin-top: var(--er-spacing-xl);
}

.page-numbers {
  display: flex;
  list-style: none;
  padding: 0;
  margin: 0;
  gap: var(--er-spacing-xs);
}

.page-numbers li a,
.page-numbers li span {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 40px;
  height: 40px;
  padding: 0 var(--er-spacing-sm);
  border-radius: var(--er-border-radius-md);
  background-color: var(--er-card-bg);
  color: var(--er-text-primary);
  text-decoration: none;
  transition: var(--er-transition-fast);
  border: 1px solid var(--er-divider);
}

.page-numbers li a:hover,
.page-numbers li span.current {
  background-color: var(--er-primary);
  color: white;
  border-color: var(--er-primary);
}

/* Página de detalle */
.er-resource-detail-container {
  max-width: 1200px;
  margin: 0 auto;
  padding: var(--er-spacing-xl);
}

.er-resource-detail {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--er-spacing-xl);
}

.er-resource-header {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--er-spacing-xl);
}

.er-resource-image {
  border-radius: var(--er-border-radius-lg);
  overflow: hidden;
  box-shadow: var(--er-shadow-md);
}

.er-resource-image img {
  width: 100%;
  height: auto;
  display: block;
}

.er-resource-info {
  display: flex;
  flex-direction: column;
  gap: var(--er-spacing-md);
}

.er-resource-meta {
  display: flex;
  flex-wrap: wrap;
  gap: var(--er-spacing-sm);
}

.er-resource-category,
.er-resource-age,
.er-resource-official-rating {
  font-size: 14px;
  padding: var(--er-spacing-xs) var(--er-spacing-md);
  border-radius: var(--er-border-radius-lg);
  background-color: var(--er-background);
  color: var(--er-text-secondary);
}

.er-resource-official-rating {
  background-color: rgba(76, 175, 80, 0.1);
  color: var(--er-success);
}

.er-resource-title {
  font-size: 28px;
  font-weight: 700;
  margin: 0;
}

.er-resource-subtitle {
  font-size: 18px;
  color: var(--er-text-secondary);
  margin: 0;
  font-weight: 400;
}

.er-resource-author {
  display: flex;
  flex-wrap: wrap;
  gap: var(--er-spacing-md);
  color: var(--er-text-secondary);
  font-size: 14px;
}

.er-resource-actions {
  display: flex;
  flex-wrap: wrap;
  gap: var(--er-spacing-md);
  margin-top: var(--er-spacing-md);
}

.er-download-btn {
  padding: var(--er-spacing-sm) var(--er-spacing-md);
  background-color: var(--er-primary);
  color: white;
  text-decoration: none;
  border-radius: var(--er-border-radius-md);
  display: inline-flex;
  align-items: center;
  gap: var(--er-spacing-sm);
  transition: var(--er-transition-medium);
}

.er-download-btn:hover {
  background-color: var(--er-primary-dark);
  color: white;
}

.er-resource-content {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--er-spacing-xl);
}

.er-resource-main {
  display: flex;
  flex-direction: column;
  gap: var(--er-spacing-xl);
}

.er-resource-section {
  background-color: var(--er-card-bg);
  border-radius: var(--er-border-radius-lg);
  padding: var(--er-spacing-lg);
  box-shadow: var(--er-shadow-sm);
}

.er-resource-section h3 {
  margin-top: 0;
  margin-bottom: var(--er-spacing-md);
  font-size: 20px;
  color: var(--er-primary);
}

.er-resource-description,
.er-resource-skills {
  line-height: 1.6;
}

.er-details-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
  gap: var(--er-spacing-md);
}

.er-detail-item {
  display: flex;
  flex-direction: column;
  gap: var(--er-spacing-xs);
}

.er-detail-label {
  font-size: 14px;
  color: var(--er-text-secondary);
}

.er-detail-value {
  font-weight: 500;
}

.er-resource-sidebar {
  display: flex;
  flex-direction: column;
  gap: var(--er-spacing-xl);
}

.er-rating-widget {
  background-color: var(--er-card-bg);
  border-radius: var(--er-border-radius-lg);
  padding: var(--er-spacing-lg);
  box-shadow: var(--er-shadow-sm);
}

.er-rating-widget h3 {
  margin-top: 0;
  margin-bottom: var(--er-spacing-md);
  font-size: 18px;
}

.er-star-rating {
  display: flex;
  gap: var(--er-spacing-xs);
  margin-bottom: var(--er-spacing-sm);
}

.er-star {
  color: var(--er-star-empty);
  cursor: pointer;
  font-size: 24px;
  transition: var(--er-transition-fast);
}

.er-star.filled {
  color: var(--er-star-filled);
}

.er-rating-summary {
  display: flex;
  align-items: baseline;
  gap: var(--er-spacing-sm);
}

.er-average-rating {
  font-size: 28px;
  font-weight: 700;
}

.er-rating-count {
  font-size: 14px;
  color: var(--er-text-secondary);
}

.er-statistics-widget {
  background-color: var(--er-card-bg);
  border-radius: var(--er-border-radius-lg);
  padding: var(--er-spacing-lg);
  box-shadow: var(--er-shadow-sm);
}

.er-statistics-widget h3 {
  margin-top: 0;
  margin-bottom: var(--er-spacing-md);
  font-size: 18px;
}

.er-statistics-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(120px, 1fr));
  gap: var(--er-spacing-md);
}

.er-statistic-item {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--er-spacing-xs);
  padding: var(--er-spacing-sm);
  background-color: var(--er-background);
  border-radius: var(--er-border-radius-md);
}

.er-statistic-item i {
  font-size: 24px;
  color: var(--er-primary);
}

.er-statistic-item span {
  font-size: 14px;
  text-align: center;
}

/* Sección de comentarios */
.er-comments-section {
  background-color: var(--er-card-bg);
  border-radius: var(--er-border-radius-lg);
  padding: var(--er-spacing-lg);
  box-shadow: var(--er-shadow-sm);
}

.er-comments-section h3 {
  margin-top: 0;
  margin-bottom: var(--er-spacing-lg);
  font-size: 20px;
  color: var(--er-primary);
}

.er-comment-form {
  display: flex;
  flex-direction: column;
  gap: var(--er-spacing-md);
  margin-bottom: var(--er-spacing-xl);
}

.er-comment-text {
  width: 100%;
  min-height: 120px;
  padding: var(--er-spacing-md);
  border: 1px solid var(--er-divider);
  border-radius: var(--er-border-radius-md);
  font-family: inherit;
  font-size: 16px;
  transition: var(--er-transition-medium);
}

.er-comment-text:focus {
  outline: none;
  border-color: var(--er-primary);
  box-shadow: 0 0 0 2px var(--er-primary-light);
}

.er-submit-comment {
  align-self: flex-start;
  padding: var(--er-spacing-sm) var(--er-spacing-lg);
  background-color: var(--er-primary);
  color: white;
  border: none;
  border-radius: var(--er-border-radius-md);
  font-size: 16px;
  font-weight: 500;
  cursor: pointer;
  transition: var(--er-transition-medium);
}

.er-submit-comment:hover {
  background-color: var(--er-primary-dark);
}

.er-login-prompt {
  text-align: center;
  padding: var(--er-spacing-lg);
  background-color: var(--er-background);
  border-radius: var(--er-border-radius-md);
  margin-bottom: var(--er-spacing-xl);
}

.er-login-prompt a {
  color: var(--er-primary);
  text-decoration: none;
  font-weight: 500;
}

.er-login-prompt a:hover {
  text-decoration: underline;
}

.er-comments-list {
  display: flex;
  flex-direction: column;
  gap: var(--er-spacing-xl);
}

.er-comment {
  display: flex;
  flex-direction: column;
  gap: var(--er-spacing-md);
  padding-bottom: var(--er-spacing-md);
  border-bottom: 1px solid var(--er-divider);
}

.er-comment:last-child {
  border-bottom: none;
  padding-bottom: 0;
}

.er-comment-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.er-comment-author {
  display: flex;
  align-items: center;
  gap: var(--er-spacing-md);
}

.er-comment-author img {
  border-radius: var(--er-border-radius-circle);
}

.er-comment-name {
  font-weight: 500;
}

.er-comment-date {
  font-size: 14px;
  color: var(--er-text-secondary);
}

.er-comment-content {
  line-height: 1.6;
}

.er-comment-actions {
  display: flex;
  gap: var(--er-spacing-md);
}

.er-edit-comment,
.er-delete-comment {
  padding: var(--er-spacing-xs) var(--er-spacing-sm);
  background: none;
  border: none;
  font-size: 14px;
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: var(--er-spacing-xs);
  transition: var(--er-transition-fast);
}

.er-edit-comment {
  color: var(--er-primary);
}

.er-edit-comment:hover {
  color: var(--er-primary-dark);
}

.er-delete-comment {
  color: var(--er-error);
}

.er-delete-comment:hover {
  color: var(--er-error);
}

/* Loading indicator */
.er-global-loading {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background-color: rgba(255, 255, 255, 0.8);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 9999;
  opacity: 0;
  pointer-events: none;
  transition: var(--er-transition-medium);
}

.er-global-loading.active {
  opacity: 1;
  pointer-events: all;
}

.er-loading-spinner {
  width: 50px;
  height: 50px;
  border: 4px solid var(--er-primary-light);
  border-top-color: var(--er-primary);
  border-radius: var(--er-border-radius-circle);
  animation: er-spin 1s linear infinite;
}

@keyframes er-spin {
  0% { transform: rotate(0deg); }
  100% { transform: rotate(360deg); }
}

/* Toast notifications */
.er-toast {
  position: fixed;
  bottom: var(--er-spacing-xl);
  left: 50%;
  transform: translateX(-50%);
  padding: var(--er-spacing-md) var(--er-spacing-lg);
  background-color: var(--er-text-primary);
  color: white !important;
  border-radius: var(--er-border-radius-md);
  box-shadow: var(--er-shadow-lg);
  z-index: 9998;
  opacity: 0;
  transition: var(--er-transition-medium);
  max-width: 90%;
  text-align: center;
}

.er-toast.show {
  opacity: 1;
  transform: translateX(-50%) translateY(-10px);
}

.er-toast.success {
  background-color: var(--er-success);
}

.er-toast.error {
  background-color: var(--er-error);
}

.er-toast.warning {
  background-color: var(--er-warning);
}

/* Responsive design */
@media (max-width: 1024px) {
  .er-resources-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  
  .er-resource-detail {
    grid-template-columns: 1fr;
  }
  
  .er-resource-sidebar {
    grid-row: 1;
  }
}

@media (max-width: 768px) {
  .er-resources-grid {
    grid-template-columns: 1fr;
  }
  
  .er-library-filters {
    flex-direction: column;
    align-items: stretch;
  }
  
  .er-filter-dropdowns {
    flex-direction: column;
  }
  
  .er-filter-select {
    width: 100%;
  }
  
  .er-resource-header {
    grid-template-columns: 1fr;
  }
  
  .er-resource-actions {
    flex-direction: column;
  }
  
  .er-download-btn,
  .er-favorite-btn {
    width: 100%;
    justify-content: center;
  }
}





/*interna recursos */

/* Estilos DSpace-like */
.dspace-container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 20px;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Oxygen-Sans, Ubuntu, Cantarell, "Helvetica Neue", sans-serif;
}

.dspace-breadcrumb {
  background: #f5f5f5;
  padding: 10px 15px;
  border-radius: 4px;
  margin-bottom: 20px;
}

.dspace-breadcrumb ol {
  list-style: none;
  padding: 0;
  margin: 0;
  display: flex;
  flex-wrap: wrap;
}

.dspace-breadcrumb li {
  display: flex;
  align-items: center;
}

.dspace-breadcrumb li:not(:last-child):after {
  content: "/";
  margin: 0 10px;
  color: #666;
}

.dspace-breadcrumb a {
  color: #1F3F5E;
  text-decoration: none;
}

.dspace-content-wrapper {
  display: grid;
  grid-template-columns: 300px 1fr;
  gap: 30px;
}

.dspace-sidebar {
  position: sticky;
  top: 20px;
  align-self: start;
}

.dspace-thumbnail-container {
  background: white;
  padding: 15px;
  border-radius: 4px;
  box-shadow: 0 1px 3px rgba(0,0,0,0.1);
  margin-bottom: 20px;
}

.dspace-thumbnail {
  width: 100%;
  height: auto;
  border-radius: 2px;
}

.dspace-resource-actions {
  margin-top: 15px;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.dspace-download-btn {
  background: #1F3F5E;
  color: white;
  padding: 12px;
  border-radius: 4px;
  text-align: center;
  text-decoration: none;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  transition: background-color 0.2s;
}

.dspace-download-btn:hover {
  background: #2c5885;
}

.dspace-download-btn small {
  opacity: 0.8;
  font-size: 0.85em;
}

.dspace-metrics-panel {
  background: white;
  padding: 20px;
  border-radius: 4px;
  box-shadow: 0 1px 3px rgba(0,0,0,0.1);
}

.dspace-metric-item {
  display: flex;
  align-items: center;
  gap: 15px;
  padding: 10px 0;
  border-bottom: 1px solid #eee;
}

.dspace-metric-item:last-child {
  border-bottom: none;
}

.dspace-metric-info {
  display: flex;
  flex-direction: column;
}

.dspace-metric-value {
  font-size: 1.2em;
  font-weight: 600;
  color: #1F3F5E;
}

.dspace-metric-label {
  color: #666;
  font-size: 0.9em;
}

.dspace-main-content {
  background: white;
  padding: 30px;
  border-radius: 4px;
  box-shadow: 0 1px 3px rgba(0,0,0,0.1);
}

.dspace-resource-title {
  font-size: 2em;
  color: #1F3F5E;
  margin: 0 0 10px 0;
}

.dspace-resource-subtitle {
  color: #666;
  font-size: 1.2em;
  font-weight: normal;
  margin: 0 0 20px 0;
}

.dspace-metadata-section {
  margin: 30px 0;
  padding-top: 30px;
  border-top: 1px solid #eee;
}

.dspace-metadata-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
  gap: 20px;
}

.dspace-metadata-item {
  display: flex;
  flex-direction: column;
  gap: 5px;
}

.dspace-metadata-item dt {
  color: #666;
  font-size: 0.9em;
}

.dspace-metadata-item dd {
  margin: 0;
  font-weight: 500;
}

.dspace-tabs {
  margin-top: 30px;
}

.dspace-tab-headers {
  display: flex;
  gap: 2px;
  margin-bottom: -1px;
}

.dspace-tab-btn {
  padding: 12px 20px;
  background: #f5f5f5;
  border: none;
  border-radius: 4px 4px 0 0;
  cursor: pointer;
  color: #666;
}

.dspace-tab-btn.active {
  background: white;
  color: #1F3F5E;
  font-weight: 500;
  border: 1px solid #eee;
  border-bottom: none;
}

.dspace-tab-content {
  display: none;
  padding: 20px;
  border: 1px solid #eee;
  border-radius: 0 4px 4px 4px;
}

.dspace-tab-content.active {
  display: block;
}

/* Responsive */
@media (max-width: 992px) {
  .dspace-content-wrapper {
    grid-template-columns: 1fr;
  }
  
  .dspace-sidebar {
    position: static;
    order: -1;
  }
}

@media (max-width: 768px) {
  .dspace-metadata-grid {
    grid-template-columns: 1fr;
  }
  
  .dspace-tab-headers {
    flex-direction: column;
  }
  
  .dspace-tab-btn {
    border-radius: 4px;
  }
}





/*interna cursos*/
.er-star {
    cursor: pointer;
    color: var(--er-star-empty);
    transition: var(--er-transition-fast);
}

.er-star.filled,
.er-star.hover {
    color: var(--er-star-filled);
}

.er-star i {
    pointer-events: none;
}