/* ==========================================================================
   AI-PKM Component Library — components.css
   All UI component styles for the AI-Powered Knowledge Management app
   ========================================================================== */

/* ==========================================================================
   SIDEBAR
   ========================================================================== */
.sidebar {
  display: flex;
  flex-direction: column;
  height: 100%;
  background-color: var(--bg-secondary);
  border-right: 1px solid var(--border-color);
  -webkit-backdrop-filter: blur(20px);
  backdrop-filter: blur(20px);
  overflow-y: auto;
  overflow-x: hidden;
  z-index: var(--z-sidebar);
}

/* Logo */
.sidebar-logo {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 24px 20px;
  font-size: 1.25rem;
  font-weight: 700;
  text-decoration: none;
  color: var(--text-primary);
  user-select: none;
  -webkit-user-select: none;
}

.sidebar-logo svg,
.sidebar-logo .sidebar-logo-icon {
  width: 32px;
  height: 32px;
  flex-shrink: 0;
}

/* Navigation */
.sidebar-nav {
  display: flex;
  flex-direction: column;
  gap: 4px;
  padding: 12px;
}

.sidebar-nav-section {
  padding: 16px 16px 8px;
  font-size: 0.65rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 1.2px;
  color: var(--text-muted);
}

.nav-item {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 10px 16px;
  border-radius: var(--radius-md);
  cursor: pointer;
  color: var(--text-secondary);
  text-decoration: none;
  font-size: 0.875rem;
  font-weight: 500;
  border-left: 3px solid transparent;
  transition: background var(--transition-fast),
              color var(--transition-fast),
              border-color var(--transition-fast);
}

.nav-item:hover {
  background: var(--bg-hover);
  color: var(--text-primary);
}

.nav-item.active {
  background: var(--bg-glass);
  color: var(--text-primary);
  border-left-color: var(--accent-primary);
}

.nav-item-icon {
  width: 20px;
  height: 20px;
  flex-shrink: 0;
  display: flex;
  align-items: center;
  justify-content: center;
}

.nav-item-icon svg {
  width: 20px;
  height: 20px;
}

.nav-item-label {
  flex: 1;
  font-size: 0.875rem;
  font-weight: 500;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.nav-item-count {
  font-size: 0.75rem;
  background: var(--bg-glass);
  padding: 2px 8px;
  border-radius: var(--radius-full);
  color: var(--text-tertiary);
  font-weight: 600;
  min-width: 24px;
  text-align: center;
  line-height: 1.4;
}

/* Category-specific active border colors */
.nav-item.cat-idea.active {
  border-left-color: var(--cat-idea);
}

.nav-item.cat-task.active {
  border-left-color: var(--cat-task);
}

.nav-item.cat-summary.active {
  border-left-color: var(--cat-summary);
}

.nav-item.cat-meeting.active {
  border-left-color: var(--cat-meeting);
}

.nav-item.cat-note.active {
  border-left-color: var(--cat-note);
}

/* Sidebar Footer */
.sidebar-footer {
  margin-top: auto;
  padding: 16px;
  border-top: 1px solid var(--border-color);
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.sidebar-footer-item {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 10px 16px;
  border-radius: var(--radius-md);
  cursor: pointer;
  color: var(--text-secondary);
  font-size: 0.875rem;
  font-weight: 500;
  background: transparent;
  user-select: none;
  transition: background var(--transition-fast),
              color var(--transition-fast),
              transform var(--transition-fast),
              box-shadow var(--transition-fast);
}

.sidebar-footer-item:hover {
  background: var(--bg-hover);
  color: var(--text-primary);
  transform: translateY(-1px);
}

.sidebar-footer-item:active {
  transform: translateY(0);
}

.sidebar-footer-item span:first-child {
  font-size: 1.1rem;
  transition: transform var(--transition-fast);
}

.sidebar-footer-item:hover span:first-child {
  transform: scale(1.15);
}

.sidebar-info {
  padding: 8px 16px 4px;
  font-size: 0.75rem;
  color: var(--text-tertiary);
  border-top: 1px solid rgba(255, 255, 255, 0.03);
  margin-top: 4px;
}

[data-theme='light'] .sidebar-info {
  border-top: 1px solid rgba(0, 0, 0, 0.03);
}

.sidebar-info-text {
  display: block;
}

.sidebar-footer-user {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 8px;
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: background var(--transition-fast);
}

.sidebar-footer-user:hover {
  background: var(--bg-hover);
}

.sidebar-footer-avatar {
  width: 32px;
  height: 32px;
  border-radius: var(--radius-full);
  background: var(--accent-gradient);
  display: flex;
  align-items: center;
  justify-content: center;
  color: #fff;
  font-weight: 600;
  font-size: 0.8rem;
  flex-shrink: 0;
}

.sidebar-footer-info {
  flex: 1;
  min-width: 0;
}

.sidebar-footer-name {
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--text-primary);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.sidebar-footer-status {
  font-size: 0.7rem;
  color: var(--text-tertiary);
}

/* ==========================================================================
   HEADER
   ========================================================================== */
.header {
  display: flex;
  align-items: center;
  gap: 16px;
  padding: 0 32px;
  background-color: var(--bg-secondary);
  border-bottom: 1px solid var(--border-color);
  -webkit-backdrop-filter: blur(20px);
  backdrop-filter: blur(20px);
  z-index: var(--z-header);
}

/* Mobile menu toggle — hidden on desktop */
.btn-menu-toggle {
  display: none;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  background: var(--bg-glass);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  color: var(--text-secondary);
  cursor: pointer;
  transition: background var(--transition-fast), color var(--transition-fast);
}

.btn-menu-toggle:hover {
  background: var(--bg-hover);
  color: var(--text-primary);
}

/* Search Bar */
.search-bar {
  flex: 1;
  max-width: 560px;
  position: relative;
}

.search-input {
  width: 100%;
  padding: 10px 16px 10px 42px;
  background: var(--bg-input);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-full);
  color: var(--text-primary);
  font-size: 0.875rem;
  outline: none;
  transition: border-color var(--transition-fast),
              box-shadow var(--transition-fast),
              background var(--transition-fast);
}

.search-input::placeholder {
  color: var(--text-muted);
}

.search-input:focus {
  border-color: var(--border-active);
  box-shadow: var(--shadow-glow);
  background: rgba(255, 255, 255, 0.08);
}

[data-theme='light'] .search-input:focus {
  background: rgba(0, 0, 0, 0.02);
}

.search-icon {
  position: absolute;
  left: 14px;
  top: 50%;
  -webkit-transform: translateY(-50%);
  transform: translateY(-50%);
  width: 18px;
  height: 18px;
  color: var(--text-tertiary);
  pointer-events: none;
}

.search-icon svg {
  width: 18px;
  height: 18px;
}

/* Search Suggestions Dropdown */
.search-suggestions {
  position: absolute;
  top: calc(100% + 8px);
  left: 0;
  right: 0;
  background: var(--bg-card);
  -webkit-backdrop-filter: blur(20px);
  backdrop-filter: blur(20px);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-lg);
  max-height: 320px;
  overflow-y: auto;
  z-index: 100;
  display: none;
}

.search-suggestions.visible {
  display: block;
}

.search-suggestion-item {
  padding: 10px 16px;
  cursor: pointer;
  border-bottom: 1px solid var(--border-color);
  transition: background var(--transition-fast);
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 0.85rem;
  color: var(--text-secondary);
}

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

.search-suggestion-item:hover {
  background: var(--bg-hover);
  color: var(--text-primary);
}

.search-suggestion-icon {
  width: 16px;
  height: 16px;
  flex-shrink: 0;
  color: var(--text-tertiary);
}

.search-suggestion-text {
  flex: 1;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.search-suggestion-category {
  font-size: 0.7rem;
  padding: 2px 8px;
  border-radius: var(--radius-full);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.3px;
}

/* Header Actions */
.header-actions {
  display: flex;
  gap: 8px;
  margin-left: auto;
  align-items: center;
}

.btn-new-note {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  height: 36px;
  padding: 0 20px;
  background: var(--accent-gradient);
  color: #ffffff;
  border-radius: var(--radius-full);
  border: none;
  font-weight: 600;
  font-size: 0.85rem;
  cursor: pointer;
  box-shadow: var(--shadow-glow);
  transition: -webkit-filter var(--transition-fast),
              filter var(--transition-fast),
              -webkit-transform var(--transition-fast),
              transform var(--transition-fast),
              box-shadow var(--transition-fast);
  white-space: nowrap;
}

.btn-new-note:hover {
  -webkit-filter: brightness(1.1);
  filter: brightness(1.1);
  -webkit-transform: translateY(-1px);
  transform: translateY(-1px);
  box-shadow: 0 0 28px rgba(99, 102, 241, 0.25);
}

.btn-new-note:active {
  -webkit-transform: translateY(0);
  transform: translateY(0);
}

.btn-new-note svg {
  width: 16px;
  height: 16px;
}

.btn-icon {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  background: var(--bg-glass);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  color: var(--text-secondary);
  cursor: pointer;
  transition: background var(--transition-fast),
              color var(--transition-fast),
              border-color var(--transition-fast);
}

.btn-icon:hover {
  background: var(--bg-hover);
  color: var(--text-primary);
  border-color: var(--border-active);
}

.btn-icon svg {
  width: 18px;
  height: 18px;
}

/* ==========================================================================
   NOTE CARDS
   ========================================================================== */

/* Container & Controls */
.notes-container {
  padding: 0;
}

.view-controls {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 0;
}

.view-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  height: 36px;
  padding: 0 14px;
  background: transparent;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-full);
  color: var(--text-secondary);
  font-size: 0.95rem;
  cursor: pointer;
  transition: background var(--transition-fast),
              color var(--transition-fast),
              border-color var(--transition-fast);
}

.view-btn:hover,
.view-btn.active {
  background: var(--bg-glass);
  color: var(--text-primary);
  border-color: var(--border-active);
}

.view-btn svg {
  width: 14px;
  height: 14px;
}

.view-controls-right {
  margin-left: auto;
  display: flex;
  align-items: center;
  gap: 8px;
}

/* Notes Grid */
.notes-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
  gap: 16px;
}

/* Note Card */
.note-card {
  background: var(--bg-card);
  -webkit-backdrop-filter: blur(12px);
  backdrop-filter: blur(12px);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 20px;
  cursor: pointer;
  position: relative;
  overflow: hidden;
  transition: transform 0.3s ease,
              box-shadow 0.3s ease,
              border-color 0.3s ease;
}

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

/* Category left-border variants */
.note-card.cat-idea {
  border-left: 4px solid var(--cat-idea);
}

.note-card.cat-task {
  border-left: 4px solid var(--cat-task);
}

.note-card.cat-summary {
  border-left: 4px solid var(--cat-summary);
}

.note-card.cat-meeting {
  border-left: 4px solid var(--cat-meeting);
}

.note-card.cat-note {
  border-left: 4px solid var(--cat-note);
}

/* Card Header */
.note-card-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 12px;
}

/* Category Badge */
.note-card-category {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 0.75rem;
  font-weight: 600;
  padding: 4px 10px;
  border-radius: var(--radius-full);
  text-transform: uppercase;
  letter-spacing: 0.5px;
  line-height: 1.3;
}

.note-card-category.cat-idea {
  background: var(--cat-idea-bg);
  color: var(--cat-idea);
}

.note-card-category.cat-task {
  background: var(--cat-task-bg);
  color: var(--cat-task);
}

.note-card-category.cat-summary {
  background: var(--cat-summary-bg);
  color: var(--cat-summary);
}

.note-card-category.cat-meeting {
  background: var(--cat-meeting-bg);
  color: var(--cat-meeting);
}

.note-card-category.cat-note {
  background: var(--cat-note-bg);
  color: var(--cat-note);
}

/* Pin Indicator */
.note-card-pin {
  position: absolute;
  top: 12px;
  right: 12px;
  opacity: 0.5;
  font-size: 14px;
  line-height: 1;
  color: var(--text-tertiary);
}

/* Card Title */
.note-card-title {
  font-size: 1rem;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 8px;
  line-height: 1.4;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

/* Card Content / Preview */
.note-card-content {
  font-size: 0.85rem;
  color: var(--text-secondary);
  line-height: 1.6;
  max-height: 80px;
  overflow: hidden;
  -webkit-mask-image: linear-gradient(to bottom, black 60%, transparent);
  mask-image: linear-gradient(to bottom, black 60%, transparent);
}

/* Card Footer */
.note-card-footer {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-top: 16px;
  padding-top: 12px;
  border-top: 1px solid var(--border-color);
}

.note-card-tags {
  display: flex;
  gap: 6px;
  flex-wrap: wrap;
  flex: 1;
  min-width: 0;
}

.note-card-tag {
  font-size: 0.7rem;
  padding: 2px 8px;
  background: var(--bg-glass);
  border-radius: var(--radius-full);
  color: var(--text-tertiary);
  white-space: nowrap;
  line-height: 1.5;
}

.note-card-date {
  font-size: 0.75rem;
  color: var(--text-muted);
  white-space: nowrap;
  margin-left: 8px;
  flex-shrink: 0;
}

/* Card Hover Actions */
.note-card-actions {
  position: absolute;
  top: 8px;
  right: 8px;
  display: flex;
  gap: 4px;
  opacity: 0;
  transition: opacity var(--transition-fast);
}

.note-card:hover .note-card-actions {
  opacity: 1;
}

.note-card-action-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 28px;
  height: 28px;
  background: var(--bg-glass);
  border-radius: var(--radius-sm);
  color: var(--text-secondary);
  border: none;
  cursor: pointer;
  transition: background var(--transition-fast), color var(--transition-fast);
}

.note-card-action-btn:hover {
  background: var(--bg-hover);
  color: var(--text-primary);
}

.note-card-action-btn svg {
  width: 14px;
  height: 14px;
}

/* Card States */
.note-card.completed {
  opacity: 0.6;
}

.note-card.completed .note-card-title {
  text-decoration: line-through;
  text-decoration-color: var(--text-muted);
}

.note-card.pinned {
  border-color: var(--accent-primary);
  box-shadow: var(--shadow-glow);
}

/* ==========================================================================
   MODAL
   ========================================================================== */
.modal-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.6);
  -webkit-backdrop-filter: blur(4px);
  backdrop-filter: blur(4px);
  z-index: var(--z-modal);
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  pointer-events: none;
  transition: opacity var(--transition-base);
}

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

.modal {
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-xl);
  width: 90%;
  max-width: 640px;
  max-height: 80vh;
  display: flex;
  flex-direction: column;
  box-shadow: var(--shadow-lg);
  -webkit-transform: scale(0.95);
  transform: scale(0.95);
  transition: -webkit-transform var(--transition-base),
              transform var(--transition-base);
}

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

/* Modal Header */
.modal-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 20px 24px;
  border-bottom: 1px solid var(--border-color);
  flex-shrink: 0;
}

.modal-header h2 {
  font-size: 1.1rem;
  font-weight: 600;
  margin: 0;
}

.modal-close {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 32px;
  height: 32px;
  background: transparent;
  border: none;
  color: var(--text-secondary);
  cursor: pointer;
  border-radius: var(--radius-sm);
  transition: background var(--transition-fast), color var(--transition-fast);
}

.modal-close:hover {
  background: var(--bg-hover);
  color: var(--text-primary);
}

.modal-close svg {
  width: 18px;
  height: 18px;
}

/* Modal Body */
.modal-body {
  flex: 1;
  padding: 24px;
  overflow-y: auto;
}

/* Note Input */
.note-input {
  width: 100%;
  min-height: 200px;
  background: transparent;
  border: none;
  color: var(--text-primary);
  font-size: 0.95rem;
  line-height: 1.7;
  resize: vertical;
  outline: none;
  font-family: var(--font-sans);
}

.note-input::placeholder {
  color: var(--text-muted);
}

/* AI Preview */
.ai-preview {
  margin-top: 16px;
  padding: 16px;
  background: var(--bg-glass);
  border-radius: var(--radius-md);
  border: 1px dashed var(--border-color);
}

.ai-preview-title {
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 1px;
  color: var(--text-tertiary);
  margin-bottom: 12px;
  font-weight: 600;
}

.ai-preview-row {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 8px;
}

.ai-preview-row:last-child {
  margin-bottom: 0;
}

.ai-preview-label {
  font-size: 0.8rem;
  color: var(--text-secondary);
  min-width: 60px;
  flex-shrink: 0;
}

.ai-preview-value {
  font-size: 0.85rem;
  color: var(--text-primary);
}

.ai-preview-tags {
  display: flex;
  gap: 6px;
  flex-wrap: wrap;
}

.ai-preview-tag {
  font-size: 0.7rem;
  padding: 2px 8px;
  background: var(--bg-glass);
  border-radius: var(--radius-full);
  color: var(--text-tertiary);
}

/* Modal Footer */
.modal-footer {
  display: flex;
  justify-content: flex-end;
  gap: 12px;
  padding: 16px 24px;
  border-top: 1px solid var(--border-color);
  flex-shrink: 0;
}

/* Button Variants */
.btn-secondary {
  padding: 8px 20px;
  background: var(--bg-glass);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  color: var(--text-secondary);
  cursor: pointer;
  font-size: 0.85rem;
  transition: background var(--transition-fast),
              color var(--transition-fast),
              border-color var(--transition-fast);
}

.btn-secondary:hover {
  background: var(--bg-hover);
  color: var(--text-primary);
  border-color: var(--border-active);
}

.btn-primary {
  padding: 8px 20px;
  background: var(--accent-gradient);
  color: #ffffff;
  border: none;
  border-radius: var(--radius-md);
  cursor: pointer;
  font-weight: 600;
  font-size: 0.85rem;
  transition: -webkit-filter var(--transition-fast),
              filter var(--transition-fast);
}

.btn-primary:hover {
  -webkit-filter: brightness(1.1);
  filter: brightness(1.1);
}

.btn-primary:disabled,
.btn-secondary:disabled {
  opacity: 0.5;
  cursor: not-allowed;
  pointer-events: none;
}

/* ==========================================================================
   TIMELINE VIEW
   ========================================================================== */
.timeline-view {
  padding-left: 32px;
  position: relative;
}

.timeline-line {
  position: absolute;
  left: 15px;
  top: 0;
  bottom: 0;
  width: 2px;
  background: linear-gradient(to bottom, var(--accent-primary), var(--accent-secondary));
  border-radius: 1px;
}

.timeline-group {
  margin-bottom: 32px;
}

.timeline-date {
  position: relative;
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--text-primary);
  padding: 6px 16px;
  background: var(--bg-secondary);
  border-radius: var(--radius-full);
  display: inline-block;
  margin-bottom: 16px;
  margin-left: -24px;
}

.timeline-date::before {
  content: '';
  width: 12px;
  height: 12px;
  border-radius: var(--radius-full);
  background: var(--accent-gradient);
  position: absolute;
  left: -26px;
  top: 50%;
  -webkit-transform: translateY(-50%);
  transform: translateY(-50%);
  border: 3px solid var(--bg-primary);
  box-sizing: content-box;
}

.timeline-cards {
  display: flex;
  flex-direction: column;
  gap: 12px;
  padding-left: 8px;
}

/* ==========================================================================
   TAG CLOUD
   ========================================================================== */
.tag-cloud {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  justify-content: center;
  padding: 24px;
}

.tag-cloud-item {
  padding: 6px 16px;
  background: var(--bg-glass);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-full);
  color: var(--text-secondary);
  cursor: pointer;
  transition: background var(--transition-fast),
              color var(--transition-fast),
              border-color var(--transition-fast),
              -webkit-transform var(--transition-fast),
              transform var(--transition-fast);
  white-space: nowrap;
}

.tag-cloud-item:hover {
  background: var(--bg-hover);
  border-color: var(--accent-primary);
  color: var(--text-primary);
  -webkit-transform: scale(1.05);
  transform: scale(1.05);
}

/* Size variants via data attribute */
.tag-cloud-item[data-size='1'] {
  font-size: 0.75rem;
}

.tag-cloud-item[data-size='2'] {
  font-size: 0.85rem;
}

.tag-cloud-item[data-size='3'] {
  font-size: 1rem;
  font-weight: 500;
}

.tag-cloud-item[data-size='4'] {
  font-size: 1.1rem;
  font-weight: 600;
}

.tag-cloud-item[data-size='5'] {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--accent-primary);
}

/* ==========================================================================
   TOAST NOTIFICATIONS
   ========================================================================== */
.toast-container {
  position: fixed;
  top: 80px;
  right: 24px;
  display: flex;
  flex-direction: column;
  gap: 8px;
  z-index: var(--z-toast);
  pointer-events: none;
}

.toast {
  padding: 12px 20px;
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  color: var(--text-primary);
  font-size: 0.85rem;
  box-shadow: var(--shadow-lg);
  -webkit-backdrop-filter: blur(12px);
  backdrop-filter: blur(12px);
  display: flex;
  align-items: center;
  gap: 10px;
  min-width: 280px;
  max-width: 420px;
  pointer-events: auto;
  -webkit-transform: translateX(120%);
  transform: translateX(120%);
  transition: -webkit-transform 0.3s ease,
              transform 0.3s ease;
}

.toast.show {
  -webkit-transform: translateX(0);
  transform: translateX(0);
}

.toast.success {
  border-left: 4px solid var(--cat-task);
}

.toast.error {
  border-left: 4px solid #ef4444;
}

.toast.info {
  border-left: 4px solid var(--accent-primary);
}

.toast-icon {
  width: 20px;
  height: 20px;
  flex-shrink: 0;
  display: flex;
  align-items: center;
  justify-content: center;
}

.toast-icon svg {
  width: 20px;
  height: 20px;
}

.toast-message {
  flex: 1;
  line-height: 1.4;
}

.toast-close {
  padding: 4px;
  background: transparent;
  border: none;
  color: var(--text-tertiary);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-sm);
  transition: color var(--transition-fast), background var(--transition-fast);
}

.toast-close:hover {
  color: var(--text-primary);
  background: var(--bg-hover);
}

.toast-close svg {
  width: 14px;
  height: 14px;
}

/* ==========================================================================
   EMPTY STATE
   ========================================================================== */
.empty-state {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 80px 24px;
  text-align: center;
}

.empty-state-icon {
  font-size: 4rem;
  margin-bottom: 16px;
  opacity: 0.4;
  line-height: 1;
}

.empty-state-title {
  font-size: 1.2rem;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 8px;
}

.empty-state-desc {
  font-size: 0.9rem;
  color: var(--text-secondary);
  max-width: 400px;
  line-height: 1.6;
}

.empty-state-action {
  margin-top: 24px;
}

/* ==========================================================================
   LOADING SPINNER
   ========================================================================== */
.loading-spinner {
  width: 32px;
  height: 32px;
  border: 3px solid var(--border-color);
  border-top-color: var(--accent-primary);
  border-radius: 50%;
  -webkit-animation: spin 0.8s linear infinite;
  animation: spin 0.8s linear infinite;
}

.loading-spinner-sm {
  width: 18px;
  height: 18px;
  border-width: 2px;
}

.loading-spinner-lg {
  width: 48px;
  height: 48px;
  border-width: 4px;
}

.loading-container {
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 48px;
}

/* ==========================================================================
   NOTE DETAIL VIEW
   ========================================================================== */
.note-detail-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.6);
  -webkit-backdrop-filter: blur(4px);
  backdrop-filter: blur(4px);
  z-index: var(--z-modal);
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  pointer-events: none;
  transition: opacity var(--transition-base);
}

.note-detail-overlay.active {
  opacity: 1;
  pointer-events: auto;
}

.note-detail {
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-xl);
  width: 90%;
  max-width: 720px;
  max-height: 85vh;
  display: flex;
  flex-direction: column;
  box-shadow: var(--shadow-lg);
  overflow: hidden;
  -webkit-transform: scale(0.95);
  transform: scale(0.95);
  transition: -webkit-transform var(--transition-base),
              transform var(--transition-base);
}

.note-detail-overlay.active .note-detail {
  -webkit-transform: scale(1);
  transform: scale(1);
}

.note-detail-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  padding: 24px 28px 0;
  flex-shrink: 0;
}

.note-detail-category {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 0.75rem;
  font-weight: 600;
  padding: 4px 10px;
  border-radius: var(--radius-full);
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

/* Re-use category badge colours for detail view */
.note-detail-category.cat-idea {
  background: var(--cat-idea-bg);
  color: var(--cat-idea);
}

.note-detail-category.cat-task {
  background: var(--cat-task-bg);
  color: var(--cat-task);
}

.note-detail-category.cat-summary {
  background: var(--cat-summary-bg);
  color: var(--cat-summary);
}

.note-detail-category.cat-meeting {
  background: var(--cat-meeting-bg);
  color: var(--cat-meeting);
}

.note-detail-category.cat-note {
  background: var(--cat-note-bg);
  color: var(--cat-note);
}

.note-detail-close {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 32px;
  height: 32px;
  background: transparent;
  border: none;
  color: var(--text-secondary);
  cursor: pointer;
  border-radius: var(--radius-sm);
  transition: background var(--transition-fast), color var(--transition-fast);
  flex-shrink: 0;
}

.note-detail-close:hover {
  background: var(--bg-hover);
  color: var(--text-primary);
}

.note-detail-body {
  flex: 1;
  padding: 20px 28px 28px;
  overflow-y: auto;
}

.note-detail-title {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 12px;
  line-height: 1.3;
}

.note-detail-meta {
  display: flex;
  gap: 16px;
  font-size: 0.8rem;
  color: var(--text-secondary);
  margin-bottom: 20px;
  flex-wrap: wrap;
}

.note-detail-meta-item {
  display: flex;
  align-items: center;
  gap: 4px;
}

.note-detail-meta-item svg {
  width: 14px;
  height: 14px;
  color: var(--text-tertiary);
}

.note-detail-content {
  font-size: 0.95rem;
  line-height: 1.8;
  color: var(--text-primary);
}

/* Prose-like styling for the note body */
.note-detail-content p {
  margin-bottom: 1em;
}

.note-detail-content h1,
.note-detail-content h2,
.note-detail-content h3 {
  margin-top: 1.5em;
  margin-bottom: 0.5em;
}

.note-detail-content ul,
.note-detail-content ol {
  padding-left: 1.5em;
  margin-bottom: 1em;
}

.note-detail-content li {
  margin-bottom: 0.25em;
  list-style: disc;
}

.note-detail-content ol li {
  list-style: decimal;
}

.note-detail-content code {
  background: var(--bg-glass);
  padding: 2px 6px;
  border-radius: 4px;
  font-size: 0.85em;
}

.note-detail-content pre {
  background: var(--bg-tertiary);
  padding: 16px;
  border-radius: var(--radius-md);
  overflow-x: auto;
  margin-bottom: 1em;
}

.note-detail-content pre code {
  background: none;
  padding: 0;
}

.note-detail-content blockquote {
  border-left: 3px solid var(--accent-primary);
  padding-left: 16px;
  margin: 1em 0;
  color: var(--text-secondary);
  font-style: italic;
}

.note-detail-tags {
  display: flex;
  gap: 8px;
  margin-top: 24px;
  flex-wrap: wrap;
}

.note-detail-tag {
  font-size: 0.75rem;
  padding: 4px 12px;
  background: var(--bg-glass);
  border-radius: var(--radius-full);
  color: var(--text-tertiary);
  border: 1px solid var(--border-color);
}

.note-detail-actions {
  display: flex;
  gap: 8px;
  margin-top: 16px;
  padding-top: 16px;
  border-top: 1px solid var(--border-color);
}

/* ==========================================================================
   RESPONSIVE — Mobile
   ========================================================================== */
@media (max-width: 768px) {
  .app-container {
    grid-template-columns: 1fr;
  }

  /* Sidebar becomes a slide-in overlay */
  .sidebar {
    position: fixed;
    top: 0;
    left: -280px;
    width: 280px;
    height: 100%;
    z-index: 300;
    transition: left 0.3s ease;
    box-shadow: var(--shadow-lg);
  }

  .sidebar.open {
    left: 0;
  }

  /* Sidebar overlay backdrop */
  .sidebar-overlay {
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.5);
    z-index: 299;
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.3s ease;
  }

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

  /* Show hamburger */
  .btn-menu-toggle {
    display: flex;
  }

  /* Grid to single column */
  .notes-grid {
    grid-template-columns: 1fr;
  }

  /* Modal full-width-ish */
  .modal {
    width: 95%;
    max-width: none;
    max-height: 90vh;
  }

  .note-detail {
    width: 95%;
    max-width: none;
    max-height: 90vh;
  }

  /* Header compact */
  .header {
    padding: 0 16px;
  }

  .btn-new-note span {
    display: none;
  }

  .btn-new-note {
    padding: 0 12px;
  }

  /* Main content compact */
  .main-content {
    padding: 16px;
  }

  /* Timeline adjustments */
  .timeline-view {
    padding-left: 24px;
  }

  .timeline-date {
    margin-left: -16px;
    font-size: 0.8rem;
  }

  /* Toast full width on mobile */
  .toast-container {
    left: 16px;
    right: 16px;
  }

  .toast {
    min-width: auto;
    max-width: none;
  }
}

/* Medium screens */
@media (max-width: 1024px) and (min-width: 769px) {
  .notes-grid {
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  }

  .main-content {
    padding: 20px 24px;
  }
}

/* Large screens */
@media (min-width: 1440px) {
  .notes-grid {
    grid-template-columns: repeat(auto-fill, minmax(360px, 1fr));
  }
}

/* ==========================================================================
   MEDIA / PHOTO UPLOAD & CAMERA STYLES
   ========================================================================== */

/* Editor Toolbar */
.note-editor-toolbar {
  display: flex;
  gap: 12px;
  margin-top: 16px;
  padding-top: 12px;
  border-top: 1px solid var(--border-color);
}

.btn-toolbar {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 16px;
  background: var(--bg-glass);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-full);
  color: var(--text-secondary);
  font-size: 0.85rem;
  font-weight: 500;
  cursor: pointer;
  transition: all var(--transition-fast);
}

.btn-toolbar:hover {
  background: var(--bg-hover);
  color: var(--text-primary);
  border-color: var(--border-active);
  transform: translateY(-1px);
}

.btn-toolbar:active {
  transform: translateY(0);
}

/* Image Previews in Editor */
.note-image-previews {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 12px;
}

.note-image-preview-item {
  position: relative;
  width: 80px;
  height: 80px;
  border-radius: var(--radius-sm);
  overflow: hidden;
  border: 1px solid var(--border-color);
  background: var(--bg-tertiary);
  transition: transform var(--transition-fast);
}

.note-image-preview-item:hover {
  transform: scale(1.05);
}

.note-image-preview-item img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.btn-remove-image {
  position: absolute;
  top: 4px;
  right: 4px;
  display: flex;
  align-items: center;
  justify-content: center;
  width: 18px;
  height: 18px;
  border-radius: 50%;
  background: rgba(0, 0, 0, 0.6);
  color: #fff;
  border: none;
  font-size: 10px;
  cursor: pointer;
  transition: background var(--transition-fast);
}

.btn-remove-image:hover {
  background: rgba(239, 68, 68, 0.9); /* Red on hover */
}

/* Camera Overlay */
.camera-modal {
  max-width: 560px;
}

.camera-body {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 0 !important;
  background: #000;
  overflow: hidden;
  border-radius: var(--radius-md);
  aspect-ratio: 4/3;
  position: relative;
}

#camera-video {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transform: scaleX(-1); /* Mirror view for natural interaction */
}

/* Note Card Images Grid */
.note-card-images {
  display: grid;
  gap: 6px;
  margin-top: 12px;
  border-radius: var(--radius-sm);
  overflow: hidden;
}

/* Responsive grid layout depending on image count */
.note-card-images[data-count="1"] {
  grid-template-columns: 1fr;
  height: 150px;
}

.note-card-images[data-count="2"] {
  grid-template-columns: 1fr 1fr;
  height: 120px;
}

.note-card-images[data-count="3"] {
  grid-template-columns: 2fr 1fr;
  grid-template-rows: 1fr 1fr;
  height: 140px;
}

.note-card-images[data-count="3"] .note-card-image-item:first-child {
  grid-row: span 2;
}

.note-card-images[data-count="4"],
.note-card-images[data-count="5"],
.note-card-images[data-count="6"],
.note-card-images[data-count="7"],
.note-card-images[data-count="8"],
.note-card-images[data-count="9"],
.note-card-images[data-count="10"] {
  grid-template-columns: repeat(3, 1fr);
  grid-template-rows: 1fr 1fr;
  height: 150px;
}

.note-card-image-item {
  width: 100%;
  height: 100%;
  object-fit: cover;
  cursor: pointer;
  background: var(--bg-tertiary);
  transition: opacity var(--transition-fast), transform var(--transition-fast);
}

.note-card-image-item:hover {
  opacity: 0.9;
  transform: scale(1.02);
}

/* Note Detail Images Gallery */
.note-detail-images {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(120px, 1fr));
  gap: 8px;
  margin-top: 20px;
  padding-top: 16px;
  border-top: 1px solid var(--border-color);
}

.note-detail-image-item {
  width: 100%;
  aspect-ratio: 1;
  object-fit: cover;
  border-radius: var(--radius-sm);
  cursor: zoom-in;
  border: 1px solid var(--border-color);
  transition: all var(--transition-fast);
}

.note-detail-image-item:hover {
  transform: scale(1.03);
  box-shadow: var(--shadow-sm);
  border-color: var(--border-active);
}

/* Lightbox Image Zoom Overlay */
.lightbox-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.9);
  -webkit-backdrop-filter: blur(12px);
  backdrop-filter: blur(12px);
  z-index: 3000; /* Above modals */
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  transition: opacity 0.25s ease;
  pointer-events: none;
}

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

.lightbox-image {
  max-width: 90%;
  max-height: 90%;
  object-fit: contain;
  border-radius: var(--radius-sm);
  box-shadow: 0 10px 40px rgba(0, 0, 0, 0.8);
  transform: scale(0.95);
  transition: transform 0.25s ease;
}

.lightbox-overlay.active .lightbox-image {
  transform: scale(1);
}

.lightbox-close {
  position: absolute;
  top: 24px;
  right: 24px;
  width: 44px;
  height: 44px;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.1);
  color: #fff;
  border: none;
  font-size: 20px;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: background var(--transition-fast), transform var(--transition-fast);
}

.lightbox-close:hover {
  background: rgba(255, 255, 255, 0.2);
  transform: scale(1.05);
}