/* ======================================================
 * Learning Paths Index
 * ======================================================
 * Requires: core-design-system.css
 * Overview page for managing learning path curriculum
 */

/* ============================================
   Page Container
   ============================================ */

.learning-paths-index-container {
  max-width: 1400px;
  margin: 0 auto;
  padding: var(--space-24) var(--space-20);
  background: var(--color-bg);
  min-height: 100vh;
}

/* ============================================
   Page Header
   ============================================ */

.paths-page-header {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  margin-bottom: var(--space-32);
  gap: var(--space-20);
}

.paths-page-header-content {
  flex: 1;
}

.paths-page-title {
  font-size: var(--font-size-3xl);
  font-weight: var(--font-weight-semibold);
  letter-spacing: -0.02em;
  color: var(--color-text-primary);
  margin: 0 0 var(--space-8) 0;
  line-height: 1.2;
}

.paths-page-description {
  font-size: var(--font-size-md);
  color: var(--color-text-muted);
  margin: 0;
  max-width: 600px;
}

.paths-page-actions {
  flex-shrink: 0;
}

/* ============================================
   Search & Filters
   ============================================ */

.paths-controls {
  display: flex;
  align-items: center;
  gap: var(--space-12);
  margin-bottom: var(--space-20);
}

.paths-search {
  flex: 1;
  max-width: 400px;
}

.search-input {
  width: 100%;
  padding: var(--space-10) var(--space-12) var(--space-10) 40px;
  font-size: var(--font-size-md);
  color: var(--color-text-primary);
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-base);
  transition: all var(--transition-base);
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='16' height='16' viewBox='0 0 24 24' fill='none' stroke='%2394a3b8' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3E%3Ccircle cx='11' cy='11' r='8'%3E%3C/circle%3E%3Cpath d='m21 21-4.35-4.35'%3E%3C/path%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: var(--space-12) center;
}

.search-input:focus {
  outline: none;
  border-color: var(--color-accent);
  box-shadow: var(--shadow-focus);
}

/* ============================================
   Paths List
   ============================================ */

.paths-list {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  overflow: hidden;
}

.path-item {
  display: flex;
  align-items: center;
  gap: var(--space-16);
  padding: var(--space-20) var(--space-24);
  border-bottom: 1px solid var(--color-border-subtle);
  transition: background var(--transition-base);
}

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

.path-item:hover {
  background: var(--color-surface-raised);
}

.path-id {
  flex-shrink: 0;
  width: 40px;
  display: flex;
  align-items: center;
  justify-content: center;
  height: 40px;
  background: var(--color-surface-raised);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-base);
  font-family: ui-monospace, 'SF Mono', Monaco, 'Cascadia Code', 'Roboto Mono', monospace;
  font-size: var(--font-size-base);
  font-weight: var(--font-weight-semibold);
  color: var(--color-text-muted);
}

.path-main {
  flex: 1;
  min-width: 0;
}

.path-header {
  display: flex;
  align-items: center;
  gap: var(--space-12);
  margin-bottom: var(--space-8);
}

.path-name {
  font-size: var(--font-size-lg);
  font-weight: var(--font-weight-semibold);
  color: var(--color-text-primary);
  margin: 0;
}

.path-name a {
  color: inherit;
  text-decoration: none;
  transition: color var(--transition-base);
}

.path-name a:hover {
  color: var(--color-accent);
}

.session-count-badge {
  display: inline-flex;
  align-items: center;
  gap: var(--space-4);
  padding: 3px var(--space-10);
  background: var(--color-accent-light);
  color: var(--color-accent);
  font-size: var(--font-size-xs);
  font-weight: var(--font-weight-semibold);
  border-radius: var(--radius-sm);
  font-family: ui-monospace, 'SF Mono', Monaco, 'Cascadia Code', 'Roboto Mono', monospace;
}

.path-description {
  font-size: var(--font-size-base);
  color: var(--color-text-secondary);
  margin: 0;
  line-height: 1.5;
}

.path-description.empty {
  color: var(--color-text-muted);
  font-style: italic;
}

.path-sessions-preview {
  margin-top: var(--space-12);
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-8);
}

.preview-session {
  display: inline-flex;
  align-items: center;
  gap: var(--space-4);
  padding: 2px var(--space-8);
  background: var(--color-surface-raised);
  border: 1px solid var(--color-border-subtle);
  border-radius: var(--radius-sm);
  font-size: var(--font-size-xs);
  color: var(--color-text-muted);
}

.preview-more {
  font-size: var(--font-size-xs);
  color: var(--color-text-muted);
  font-style: italic;
}

.path-actions {
  flex-shrink: 0;
  display: flex;
  gap: var(--space-8);
}

.action-button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  border-radius: var(--radius-base);
  background: transparent;
  border: 1px solid var(--color-border);
  color: var(--color-text-muted);
  cursor: pointer;
  transition: all var(--transition-base);
  text-decoration: none;
}

.action-button:hover {
  background: var(--color-surface-raised);
  border-color: var(--color-accent);
  color: var(--color-accent);
  text-decoration: none;
}

.action-button.danger:hover {
  background: var(--color-danger-bg);
  border-color: var(--color-danger);
  color: var(--color-danger);
}

/* ============================================
   Empty State
   ============================================ */

.empty-state {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: var(--space-32) var(--space-24);
  text-align: center;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
}

.empty-icon {
  font-size: 64px;
  color: var(--color-text-faint);
  margin-bottom: var(--space-20);
  opacity: 0.5;
}

.empty-title {
  font-size: var(--font-size-xl);
  font-weight: var(--font-weight-semibold);
  color: var(--color-text-secondary);
  margin: 0 0 var(--space-8) 0;
}

.empty-description {
  font-size: var(--font-size-md);
  color: var(--color-text-muted);
  margin: 0 0 var(--space-24) 0;
  max-width: 400px;
  line-height: 1.5;
}

/* ============================================
   Inline Editing
   ============================================ */

.path-edit-inline {
  display: none;
  margin-top: var(--space-8);
}

.path-edit-inline.active {
  display: block;
}

.inline-edit-input,
.inline-edit-textarea {
  width: 100%;
  padding: var(--space-8) var(--space-10);
  font-size: var(--font-size-md);
  color: var(--color-text-primary);
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-base);
  transition: all var(--transition-base);
  font-family: inherit;
}

.inline-edit-input:focus,
.inline-edit-textarea:focus {
  outline: none;
  border-color: var(--color-accent);
  box-shadow: var(--shadow-focus);
}

.inline-edit-textarea {
  resize: vertical;
  min-height: 60px;
  line-height: 1.5;
}

.inline-edit-actions {
  display: flex;
  gap: var(--space-8);
  margin-top: var(--space-8);
}

.btn-inline {
  padding: var(--space-8) var(--space-12);
  font-size: var(--font-size-sm);
}

/* ============================================
   Stats Summary (Optional)
   ============================================ */

.paths-stats {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: var(--space-16);
  margin-bottom: var(--space-24);
}

.stat-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--space-20);
  display: flex;
  flex-direction: column;
  gap: var(--space-4);
}

.stat-number {
  font-size: var(--font-size-4xl);
  font-weight: var(--font-weight-semibold);
  letter-spacing: -0.02em;
  color: var(--color-text-primary);
  line-height: 1;
  font-family: ui-monospace, 'SF Mono', Monaco, 'Cascadia Code', 'Roboto Mono', monospace;
  font-variant-numeric: tabular-nums;
}

.stat-label {
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-medium);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--color-text-muted);
}

/* ============================================
   Modals
   ============================================ */

.modal-backdrop {
  background: rgba(15, 23, 42, 0.4);
  backdrop-filter: blur(2px);
}

.modal-content {
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  box-shadow: 0 10px 25px rgba(15, 23, 42, 0.15);
}

.modal-header {
  padding: var(--space-20) var(--space-24);
  background: var(--color-surface-raised);
  border-bottom: 1px solid var(--color-border);
  border-radius: var(--radius-lg) var(--radius-lg) 0 0;
}

.modal-title {
  font-size: var(--font-size-lg);
  font-weight: var(--font-weight-semibold);
  color: var(--color-text-primary);
  margin: 0;
}

.modal-body {
  padding: var(--space-24);
}

.modal-footer {
  padding: var(--space-20) var(--space-24);
  background: var(--color-surface-raised);
  border-top: 1px solid var(--color-border);
  border-radius: 0 0 var(--radius-lg) var(--radius-lg);
}

.form-field {
  margin-bottom: var(--space-16);
}

.form-field:last-of-type {
  margin-bottom: 0;
}

.form-label {
  display: block;
  font-size: var(--font-size-base);
  font-weight: var(--font-weight-medium);
  color: var(--color-text-secondary);
  margin-bottom: var(--space-8);
}

.form-input,
.form-textarea {
  width: 100%;
  padding: var(--space-10) var(--space-12);
  font-size: var(--font-size-md);
  color: var(--color-text-primary);
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-base);
  transition: all var(--transition-base);
  font-family: inherit;
}

.form-input:hover,
.form-textarea:hover {
  border-color: var(--color-border);
}

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

.form-textarea {
  resize: vertical;
  line-height: 1.5;
}

/* ============================================
   Responsive
   ============================================ */

@media (max-width: 768px) {
  .learning-paths-index-container {
    padding: var(--space-16) var(--space-12);
  }

  .paths-page-header {
    flex-direction: column;
    align-items: stretch;
  }

  .paths-page-title {
    font-size: var(--font-size-2xl);
  }

  .paths-controls {
    flex-direction: column;
    align-items: stretch;
  }

  .paths-search {
    max-width: none;
  }

  .path-item {
    flex-direction: column;
    align-items: stretch;
    gap: var(--space-12);
    padding: var(--space-16);
  }

  .path-id {
    align-self: flex-start;
  }

  .path-actions {
    align-self: flex-end;
  }

  .path-sessions-preview {
    flex-direction: column;
  }

  .paths-stats {
    grid-template-columns: 1fr;
  }
}