/* ============================================
   Knowledge Base Page Styles
   ============================================ */

.kb-layout {
  display: grid;
  grid-template-columns: 280px 1fr;
  gap: var(--space-4);
  min-height: calc(100vh - var(--header-height) - var(--space-20));
}

/* ── Category Sidebar ── */
.kb-sidebar {
  background: var(--color-surface);
  backdrop-filter: blur(var(--glass-blur));
  border: 1px solid var(--color-glass-border);
  border-radius: var(--radius-lg);
  padding: var(--space-4);
}

.kb-category-list {
  display: flex;
  flex-direction: column;
  gap: var(--space-1);
}

.kb-category {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  padding: var(--space-3) var(--space-4);
  border-radius: var(--radius-md);
  cursor: pointer;
  font-size: var(--text-sm);
  color: var(--color-text-secondary);
  transition: all var(--transition-fast);
}

.kb-category:hover { background: var(--color-glass); color: var(--color-text); }
.kb-category.active { background: var(--color-accent-50); color: var(--color-accent); font-weight: var(--weight-semibold); }

.kb-category .cat-icon { font-size: 18px; flex-shrink: 0; }
.kb-category .cat-count { margin-left: auto; font-size: var(--text-xs); color: var(--color-text-tertiary); background: var(--color-glass); padding: 2px 8px; border-radius: var(--radius-full); }

/* ── Content Area ── */
.kb-content {
  display: flex;
  flex-direction: column;
  gap: var(--space-4);
}

.kb-toolbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-3);
  flex-wrap: wrap;
}

.kb-search {
  position: relative;
  flex: 1;
  max-width: 400px;
}

.kb-search input {
  width: 100%;
  padding: var(--space-3) var(--space-4) var(--space-3) 40px;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  font-size: var(--text-sm);
  color: var(--color-text);
}

.kb-search .search-icon { position: absolute; left: 12px; top: 50%; transform: translateY(-50%); color: var(--color-text-tertiary); }

.kb-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: var(--space-4);
}

.kb-card {
  background: var(--color-surface);
  backdrop-filter: blur(var(--glass-blur));
  border: 1px solid var(--color-glass-border);
  border-radius: var(--radius-lg);
  padding: var(--space-5);
  transition: all var(--transition-base);
  cursor: pointer;
}

.kb-card:hover { transform: translateY(-3px); box-shadow: var(--shadow-lg); border-color: var(--color-accent); }

.kb-card-header { display: flex; align-items: flex-start; justify-content: space-between; margin-bottom: var(--space-3); }
.kb-card-icon { font-size: 28px; }
.kb-card-title { font-size: var(--text-sm); font-weight: var(--weight-bold); color: var(--color-text); margin-bottom: var(--space-2); }
.kb-card-desc { font-size: var(--text-xs); color: var(--color-text-secondary); line-height: var(--leading-relaxed); margin-bottom: var(--space-3); }
.kb-card-meta { display: flex; align-items: center; gap: var(--space-3); font-size: var(--text-xs); color: var(--color-text-tertiary); }

@media (max-width: 1199px) { .kb-layout { grid-template-columns: 1fr; } .kb-sidebar { display: none; } }
@media (max-width: 767px) { .kb-grid { grid-template-columns: 1fr; } }

/* ── Upload Modal Styles ── */
.kb-modal-overlay {
  position: fixed;
  top: 0;
  left: 0;
  width: 100vw;
  height: 100vh;
  background: rgba(0, 0, 0, 0.6);
  backdrop-filter: blur(8px);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 1000;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.3s ease;
}

.kb-modal-overlay.active {
  opacity: 1;
  pointer-events: auto;
}

.kb-modal-content {
  background: var(--color-surface);
  border: 1px solid var(--color-glass-border);
  border-radius: var(--radius-xl);
  width: 90%;
  max-width: 550px;
  padding: var(--space-6);
  box-shadow: var(--shadow-2xl);
  transform: translateY(20px);
  transition: transform 0.3s ease;
}

.kb-modal-overlay.active .kb-modal-content {
  transform: translateY(0);
}

.kb-modal-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: var(--space-5);
  border-bottom: 1px solid var(--color-glass-border);
  padding-bottom: var(--space-3);
}

.kb-modal-header h3 {
  font-size: var(--text-base);
  font-weight: var(--weight-bold);
  color: var(--color-text);
  margin: 0;
}

.modal-close-btn {
  background: none;
  border: none;
  color: var(--color-text-secondary);
  font-size: 24px;
  cursor: pointer;
  line-height: 1;
  padding: 0;
  transition: color var(--transition-fast);
}

.modal-close-btn:hover {
  color: var(--color-danger);
}

.form-group {
  margin-bottom: var(--space-4);
}

.form-group label {
  display: block;
  font-size: var(--text-xs);
  font-weight: var(--weight-semibold);
  color: var(--color-text-secondary);
  margin-bottom: var(--space-2);
}

.form-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-4);
}

.form-input, .form-select, .form-textarea {
  width: 100%;
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  color: var(--color-text);
  padding: var(--space-3);
  font-size: var(--text-xs);
  transition: border-color var(--transition-fast);
}

.form-input:focus, .form-select:focus, .form-textarea:focus {
  border-color: var(--color-accent);
  outline: none;
}

.form-textarea {
  resize: vertical;
}

.modal-footer {
  display: flex;
  justify-content: flex-end;
  gap: var(--space-3);
  margin-top: var(--space-6);
  border-top: 1px solid var(--color-glass-border);
  padding-top: var(--space-4);
}