/**
 * @fileoverview Стили для страницы базы знаний "Читатель"
 * @description Специализированные стили в соответствии с дизайном админ-панели
 * @author Reader Development Team
 */

/* ========================================
   ИМПОРТ ОСНОВНЫХ СТИЛЕЙ
   ======================================== */
/* Основные стили уже подключены через main.css */

/* ========================================
   ПЕРЕМЕННЫЕ ДЛЯ БАЗЫ ЗНАНИЙ
   ======================================== */
:root {
  --knowledge-primary: var(--reader-gold);
  --knowledge-secondary: var(--reader-brown);
  --knowledge-accent: #3498db;
  --knowledge-success: var(--success-color);
  --knowledge-warning: var(--warning-color);
  --knowledge-error: var(--error-color);
}

/* ========================================
   LAYOUT СТРАНИЦЫ БАЗЫ ЗНАНИЙ
   ======================================== */

.dashboard-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 2rem;
  padding-bottom: 1rem;
  border-bottom: 2px solid var(--knowledge-primary);
}

.dashboard-controls {
  display: flex;
  gap: 1rem;
  align-items: center;
}

/* ========================================
   СТАТИСТИЧЕСКИЕ КАРТОЧКИ
   ======================================== */

.stats-cards {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 1.5rem;
  margin-bottom: 2rem;
}

.stat-card {
  background: var(--card-bg);
  border: 1px solid var(--border-color);
  border-radius: var(--border-radius);
  padding: 1.5rem;
  transition: all var(--transition-normal);
  position: relative;
  overflow: hidden;
}

.stat-card:hover {
  border-color: var(--knowledge-primary);
  box-shadow: 0 8px 25px var(--reader-gold-glow);
  transform: translateY(-2px);
}

.stat-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 1rem;
}

.stat-header h3 {
  margin: 0;
  font-size: 0.9rem;
  color: var(--text-light);
  font-weight: 500;
}

.stat-icon {
  font-size: 1.5rem;
  opacity: 0.7;
}

.stat-value {
  font-size: 2.2rem;
  font-weight: 700;
  color: var(--knowledge-primary);
  margin-bottom: 0.5rem;
  font-family: var(--font-heading);
}

.stat-change {
  font-size: 0.8rem;
  padding: 0.25rem 0.5rem;
  border-radius: 12px;
  font-weight: 500;
}

.stat-change.positive {
  background: rgba(39, 174, 96, 0.2);
  color: var(--success-color);
}

.stat-change.negative {
  background: rgba(231, 76, 60, 0.2);
  color: var(--error-color);
}

.stat-change.warning {
  background: rgba(243, 156, 18, 0.2);
  color: var(--warning-color);
}

.stat-change.neutral {
  background: rgba(212, 175, 55, 0.1);
  color: var(--text-muted);
}

/* ========================================
   ФИЛЬТРЫ И ПОИСК
   ======================================== */

.filters-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 1rem;
  margin-bottom: 1.5rem;
}

.form-actions {
  display: flex;
  gap: 1rem;
  justify-content: flex-end;
  margin-top: 1rem;
  padding-top: 1rem;
  border-top: 1px solid var(--border-color);
}

/* ========================================
   ТАБЛИЦА ДОКУМЕНТОВ
   ======================================== */

.section-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 1.5rem;
  padding-bottom: 1rem;
  border-bottom: 1px solid var(--border-color);
}

.section-header h3 {
  margin: 0;
  color: var(--text-white);
}

.table-controls {
  display: flex;
  align-items: center;
  gap: 1rem;
}

.results-count {
  color: var(--text-muted);
  font-size: 0.9rem;
}

.table-container {
  overflow-x: auto;
  border-radius: var(--border-radius);
  background: var(--card-bg);
  border: 1px solid var(--border-color);
}

.data-table {
  width: 100%;
  border-collapse: collapse;
  background: transparent;
}

.data-table th,
.data-table td {
  padding: 1rem;
  text-align: left;
  border-bottom: 1px solid var(--border-color);
  color: var(--text-light);
  vertical-align: middle;
}

.data-table th {
  background: rgba(212, 175, 55, 0.1);
  color: var(--text-white);
  font-weight: 600;
  position: sticky;
  top: 0;
  z-index: 10;
}

.data-table tr {
  transition: background-color var(--transition-fast);
}

.data-table tr:hover {
  background: rgba(212, 175, 55, 0.05);
}

.table-loading td {
  text-align: center;
  color: var(--text-muted);
  font-style: italic;
  padding: 3rem;
}

/* Колонки таблицы */
.col-title {
  width: 30%;
  min-width: 200px;
}

.col-category {
  width: 15%;
  min-width: 120px;
}

.col-language {
  width: 10%;
  min-width: 80px;
}

.col-tags {
  width: 20%;
  min-width: 150px;
}

.col-status {
  width: 12%;
  min-width: 100px;
}

.col-actions {
  width: 13%;
  min-width: 120px;
}

/* ========================================
   КОНТЕНТ ДОКУМЕНТОВ
   ======================================== */

.document-title {
  font-weight: 600;
  color: var(--text-white);
  margin-bottom: 0.25rem;
}

.document-content-preview {
  color: var(--text-muted);
  font-size: 0.85rem;
  line-height: 1.4;
}

/* ========================================
   БЕЙДЖИ И СТАТУСЫ
   ======================================== */

.badge {
  display: inline-block;
  padding: 0.25rem 0.75rem;
  border-radius: 20px;
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.badge-primary {
  background: var(--knowledge-primary);
  color: var(--dark-bg);
}

.badge-secondary {
  background: var(--reader-brown);
  color: var(--text-white);
}

.badge-success {
  background: var(--success-color);
  color: var(--text-white);
}

.badge-warning {
  background: var(--warning-color);
  color: var(--dark-bg);
}

.badge-sm {
  padding: 0.1rem 0.4rem;
  font-size: 0.65rem;
}

/* Категории */
.category-books { 
  background: var(--reader-gold); 
  color: var(--dark-bg); 
}
.category-psychology { 
  background: #9b59b6; 
  color: var(--text-white); 
}
.category-self-development { 
  background: #e67e22; 
  color: var(--text-white); 
}
.category-relationships { 
  background: #e91e63; 
  color: var(--text-white); 
}
.category-productivity { 
  background: #3498db; 
  color: var(--text-white); 
}
.category-mindfulness { 
  background: #1abc9c; 
  color: var(--text-white); 
}
.category-creativity { 
  background: #f39c12; 
  color: var(--dark-bg); 
}
.category-general { 
  background: var(--reader-brown); 
  color: var(--text-white); 
}

/* Статусы */
.status-published { 
  background: var(--success-color); 
  color: var(--text-white); 
}
.status-draft { 
  background: var(--warning-color); 
  color: var(--dark-bg); 
}

/* Теги */
.tag-badge {
  display: inline-block;
  background: rgba(212, 175, 55, 0.1);
  border: 1px solid var(--reader-gold);
  color: var(--reader-gold);
  padding: 0.1rem 0.4rem;
  border-radius: 12px;
  font-size: 0.7rem;
  margin-right: 0.25rem;
  margin-bottom: 0.25rem;
  font-weight: 500;
}

/* ========================================
   КНОПКИ ДЕЙСТВИЙ
   ======================================== */

.btn-group {
  display: flex;
  gap: 0.25rem;
}

.btn-group .btn {
  border-radius: var(--border-radius);
  min-width: 40px;
  height: 35px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.9rem;
}

.btn-sm {
  padding: 0.4rem 0.8rem;
  font-size: 0.8rem;
  height: 32px;
}

/* Переопределение кнопок для лучшей читаемости */
.btn-secondary {
  background: rgba(108, 117, 125, 0.8);
  border: 1px solid #6c757d;
  color: var(--text-white);
}

.btn-secondary:hover {
  background: #6c757d;
  border-color: var(--reader-gold);
  color: var(--reader-gold);
}

.btn-primary {
  background: linear-gradient(135deg, var(--reader-gold), var(--reader-gold-light));
  border: 1px solid var(--reader-gold);
  color: var(--dark-bg);
  font-weight: 600;
}

.btn-primary:hover {
  background: var(--reader-gold-light);
  box-shadow: 0 0 15px var(--reader-gold-glow);
  transform: translateY(-1px);
}

.btn-danger {
  background: rgba(220, 53, 69, 0.8);
  border: 1px solid #dc3545;
  color: var(--text-white);
}

.btn-danger:hover {
  background: #dc3545;
  box-shadow: 0 0 10px rgba(220, 53, 69, 0.4);
}

/* ========================================
   УПРАВЛЕНИЕ AI ИНДЕКСОМ
   ======================================== */

.ai-actions {
  display: flex;
  gap: 1rem;
  margin-bottom: 1.5rem;
  flex-wrap: wrap;
}

.ai-info {
  margin-top: 1rem;
}

.last-updated {
  color: var(--text-muted);
  font-size: 0.9rem;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

/* ========================================
   ПАГИНАЦИЯ
   ======================================== */

.pagination-container {
  padding: 1rem;
  border-top: 1px solid var(--border-color);
  display: flex;
  justify-content: center;
}

.pagination {
  display: flex;
  list-style: none;
  gap: 0.25rem;
  margin: 0;
  padding: 0;
}

.page-item {
  display: flex;
}

.page-link {
  display: flex;
  align-items: center;
  justify-content: center;
  min-width: 40px;
  height: 40px;
  padding: 0.5rem 0.75rem;
  background: var(--card-bg);
  border: 1px solid var(--border-color);
  border-radius: var(--border-radius);
  color: var(--text-light);
  text-decoration: none;
  font-weight: 500;
  transition: all var(--transition-fast);
  cursor: pointer;
}

.page-link:hover {
  background: var(--hover-bg);
  border-color: var(--reader-gold);
  color: var(--reader-gold);
}

.page-item.active .page-link {
  background: var(--reader-gold);
  border-color: var(--reader-gold);
  color: var(--dark-bg);
  font-weight: 600;
}

/* ========================================
   МОДАЛЬНЫЕ ОКНА
   ======================================== */

.modal-overlay {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(0, 0, 0, 0.8);
  backdrop-filter: blur(5px);
  z-index: 10000;
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  visibility: hidden;
  transition: all var(--transition-normal);
}

.modal-overlay.active {
  opacity: 1;
  visibility: visible;
}

.modal-content {
  background: var(--card-bg);
  border: 2px solid var(--reader-gold);
  border-radius: var(--border-radius);
  padding: 2rem;
  max-width: 90vw;
  max-height: 90vh;
  overflow-y: auto;
  position: relative;
  box-shadow: 0 20px 40px rgba(0, 0, 0, 0.5);
  transform: scale(0.8);
  transition: transform var(--transition-normal);
}

.modal-overlay.active .modal-content {
  transform: scale(1);
}

.modal-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 1.5rem;
  padding-bottom: 1rem;
  border-bottom: 1px solid var(--border-color);
}

.modal-header h3 {
  margin: 0;
  color: var(--reader-gold);
}

.modal-close {
  background: none;
  border: none;
  color: var(--text-light);
  font-size: 1.5rem;
  cursor: pointer;
  padding: 0.5rem;
  border-radius: 50%;
  transition: all var(--transition-fast);
  width: 40px;
  height: 40px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.modal-close:hover {
  background: var(--error-color);
  color: var(--text-white);
}

/* ========================================
   ЗАГРУЗКА И СПИННЕРЫ
   ======================================== */

.loading-spinner {
  width: 20px;
  height: 20px;
  border: 2px solid var(--border-color);
  border-top: 2px solid var(--reader-gold);
  border-radius: 50%;
  animation: spin 1s linear infinite;
  display: inline-block;
  margin-right: 0.5rem;
}

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

.loading-container {
  text-align: center;
  padding: 2rem;
  color: var(--text-muted);
}

/* ========================================
   ALERT И ИНФОРМАЦИОННЫЕ БЛОКИ
   ======================================== */

.alert {
  padding: 1rem 1.5rem;
  border-radius: var(--border-radius);
  margin-bottom: 1rem;
  border: 1px solid transparent;
  position: relative;
  overflow: hidden;
}

.alert::before {
  content: '';
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 4px;
  background: currentColor;
}

.alert-info {
  background: rgba(52, 152, 219, 0.1);
  border-color: rgba(52, 152, 219, 0.2);
  color: var(--text-light);
}

.alert-info::before {
  background: var(--info-color);
}

.alert-success {
  background: rgba(39, 174, 96, 0.1);
  border-color: rgba(39, 174, 96, 0.2);
  color: var(--text-light);
}

.alert-success::before {
  background: var(--success-color);
}

.alert-warning {
  background: rgba(243, 156, 18, 0.1);
  border-color: rgba(243, 156, 18, 0.2);
  color: var(--text-light);
}

.alert-warning::before {
  background: var(--warning-color);
}

/* ========================================
   UPLOAD И DRAG & DROP
   ======================================== */

.file-upload-area {
  border: 2px dashed var(--border-color);
  border-radius: var(--border-radius);
  padding: 2rem;
  text-align: center;
  background: rgba(212, 175, 55, 0.02);
  transition: all var(--transition-fast);
  cursor: pointer;
  position: relative;
}

.file-upload-area:hover,
.file-upload-area.drag-over {
  border-color: var(--reader-gold);
  background: rgba(212, 175, 55, 0.05);
}

.file-upload-text {
  color: var(--text-muted);
}

.upload-icon {
  font-size: 3rem;
  margin-bottom: 1rem;
  opacity: 0.6;
}

.selected-file {
  display: flex;
  align-items: center;
  gap: 1rem;
  padding: 1rem;
  background: var(--hover-bg);
  border-radius: var(--border-radius);
  border: 1px solid var(--reader-gold);
}

.file-icon {
  font-size: 2rem;
}

.file-details {
  flex: 1;
}

.file-name {
  font-weight: 600;
  color: var(--text-white);
}

.file-size {
  color: var(--text-muted);
  font-size: 0.9rem;
}

.remove-file {
  background: var(--error-color);
  border: none;
  color: var(--text-white);
  width: 30px;
  height: 30px;
  border-radius: 50%;
  cursor: pointer;
  font-size: 1.2rem;
  display: flex;
  align-items: center;
  justify-content: center;
}

/* ========================================
   LANGUAGE DISTRIBUTION
   ======================================== */

.language-distribution {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.stat-item {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 0.25rem 0;
}

.stat-label {
  color: var(--text-light);
  font-size: 0.8rem;
}

.stat-value {
  color: var(--reader-gold);
  font-weight: 600;
  font-size: 0.8rem;
}

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

/* Tablets */
@media (max-width: 1024px) {
  .stats-cards {
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 1rem;
  }
  
  .dashboard-header {
    flex-direction: column;
    gap: 1rem;
    align-items: flex-start;
  }
  
  .dashboard-controls {
    width: 100%;
    justify-content: flex-end;
  }
  
  .filters-grid {
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  }
  
  .ai-actions {
    flex-direction: column;
  }
}

/* Mobile */
@media (max-width: 768px) {
  .stats-cards {
    grid-template-columns: 1fr;
  }
  
  .filters-grid {
    grid-template-columns: 1fr;
  }
  
  .form-actions {
    flex-direction: column;
  }
  
  .ai-actions {
    flex-direction: column;
  }
  
  .dashboard-controls {
    flex-direction: column;
    gap: 1rem;
  }
  
  .section-header {
    flex-direction: column;
    gap: 1rem;
    align-items: flex-start;
  }
  
  .table-container {
    font-size: 0.85rem;
  }
  
  .data-table th,
  .data-table td {
    padding: 0.75rem 0.5rem;
  }
  
  .btn-group {
    flex-direction: column;
    gap: 0.5rem;
  }
  
  .btn-group .btn {
    width: 100%;
  }
  
  .modal-content {
    margin: 1rem;
    padding: 1.5rem;
    max-width: calc(100vw - 2rem);
  }
  
  .pagination {
    flex-wrap: wrap;
    gap: 0.125rem;
  }
  
  .page-link {
    min-width: 35px;
    height: 35px;
    font-size: 0.8rem;
  }
}

/* Small mobile */
@media (max-width: 480px) {
  .stat-card {
    padding: 1rem;
  }
  
  .stat-value {
    font-size: 1.8rem;
  }
  
  .glow-card {
    padding: 1rem;
  }
  
  .data-table th,
  .data-table td {
    padding: 0.5rem 0.25rem;
    font-size: 0.75rem;
  }
  
  .btn {
    padding: 0.5rem 0.75rem;
    font-size: 0.8rem;
  }
  
  .file-upload-area {
    padding: 1.5rem 1rem;
  }
  
  .upload-icon {
    font-size: 2rem;
  }
}