/* ==========================================================================
   CSS DESIGN SYSTEM & THEMES
   ========================================================================== */

:root {
  /* Fonts */
  --font-ui: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  --font-editor: 'DM Sans', sans-serif;
  --font-title: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;

  /* Typography Sizes */
  --fs-xs: 0.75rem;     /* 12px */
  --fs-sm: 0.875rem;    /* 14px */
  --fs-base: 1rem;      /* 16px */
  --fs-lg: 1.125rem;    /* 18px */
  --fs-xl: 1.25rem;     /* 20px */
  --fs-2xl: 1.5rem;     /* 24px */
  --fs-3xl: 2rem;       /* 32px */

  /* Global Radius & Transitions */
  --radius-xs: 6px;
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 16px;
  --transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-slow: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);

  /* Shared Light Colors */
  --accent: #5B5BD6;
  --accent-hover: #4B4BC6;
  --accent-light: #EBEBFF;
  --accent-light-border: #D6D6F5;
  --green: #16A34A;
  --red: #DC2626;
  --yellow: #D97706;
  --secondary-accent: #3B82F6;

  /* LIGHT THEME */
  --bg-app: #F6F3EE;
  --bg-sidebar: #F0EBE3;
  --bg-list: #F6F3EE;
  --bg-editor: #F6F3EE;
  --bg-card: #FFFFFF;
  --bg-card-hover: #FAF7F2;
  --bg-card-active: #F0EBE3;
  --border: #D6D3D1;
  --border-focus: #5B5BD6;

  --text-primary: #1F2937;
  --text-secondary: #6B7280;
  --text-tertiary: #9CA3AF;

  --shadow-sm: 0 1px 2px rgba(31, 41, 55, 0.05);
  --shadow-md: 0 4px 6px -1px rgba(31, 41, 55, 0.08), 0 2px 4px -1px rgba(31, 41, 55, 0.04);
  --shadow-lg: 0 10px 15px -3px rgba(31, 41, 55, 0.1), 0 4px 6px -2px rgba(31, 41, 55, 0.05);
}

[data-theme="dark"] {
  /* Shared Dark Colors */
  --accent: #7C6CF6;
  --accent-hover: #6B5BE5;
  --accent-light: #2A2A4A;
  --accent-light-border: #3A3A6A;
  --green: #22C55E;
  --red: #EF4444;
  --yellow: #F59E0B;
  --secondary-accent: #4C8DFF;

  /* DARK THEME */
  --bg-app: #15171C;
  --bg-sidebar: #1B1F27;
  --bg-list: #15171C;
  --bg-editor: #15171C;
  --bg-card: #222833;
  --bg-card-hover: #2A3140;
  --bg-card-active: #323844;
  --border: #323844;
  --border-focus: #7C6CF6;

  --text-primary: #F3F4F6;
  --text-secondary: #9CA3AF;
  --text-tertiary: #6B7280;

  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.4);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.3), 0 2px 4px -1px rgba(0, 0, 0, 0.2);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.4), 0 4px 6px -2px rgba(0, 0, 0, 0.3);
}

/* ==========================================================================
   RESET & BASE STYLES
   ========================================================================== */

*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

body {
  font-family: var(--font-ui);
  background: var(--bg-app);
  color: var(--text-primary);
  height: 100vh;
  overflow: hidden;
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
}

button, input, select {
  font-family: inherit;
  font-size: inherit;
  color: inherit;
}

/* Premium Scrollbars */
::-webkit-scrollbar {
  width: 6px;
  height: 6px;
}
::-webkit-scrollbar-track {
  background: transparent;
}
::-webkit-scrollbar-thumb {
  background: var(--border);
  border-radius: var(--radius-xs);
}
::-webkit-scrollbar-thumb:hover {
  background: var(--text-tertiary);
}

/* ==========================================================================
   LAYOUT STRUCTURE (3-Pane Grid)
   ========================================================================== */

.app-container {
  display: flex;
  width: 100vw;
  height: 100vh;
  overflow: hidden;
  background: var(--bg-app);
}

.app-container {
  display: grid;
  grid-template-columns: 260px 380px 1fr;
  width: 100vw;
  height: 100vh;
  overflow: hidden;
  transition: var(--transition-slow);
}

/* Distraction Free Mode: Hide Sidebar & Notes List */
.app-container.distraction-free {
  grid-template-columns: 0px 0px 1fr;
}

.app-container.distraction-free .sidebar,
.app-container.distraction-free .notes-list-pane {
  transform: translateX(-100%);
  opacity: 0;
  pointer-events: none;
}

/* ==========================================================================
   SIDEBAR PANE (Left Column)
   ========================================================================== */

.sidebar {
  background: var(--bg-sidebar);
  border-right: 1px solid var(--border);
  display: flex;
  flex-direction: column;
  height: 100%;
  overflow: hidden;
  transition: var(--transition-slow);
  z-index: 10;
}

/* Branding / Header */
.sidebar-header {
  padding: 24px 20px 16px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.logo {
  display: flex;
  align-items: center;
  gap: 10px;
  text-decoration: none;
  font-family: var(--font-title);
  font-weight: 800;
  letter-spacing: -0.04em;
  font-size: 1.25rem;
  color: var(--text-primary);
}

.logo-icon {
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--accent);
}

.logo-text {
  color: var(--text-primary);
}

.sidebar-collapse-btn {
  background: transparent;
  border: none;
  cursor: pointer;
  color: var(--text-secondary);
  border-radius: var(--radius-sm);
  padding: 6px;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: var(--transition);
}

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

/* Folder Section & Lists */
.sidebar-scroll {
  flex: 1;
  overflow-y: auto;
  padding: 12px 12px 24px;
}

.sidebar-section {
  margin-bottom: 24px;
}

.sidebar-section-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 6px 12px;
  font-size: var(--fs-xs);
  font-weight: 600;
  letter-spacing: 0.08em;
  color: var(--text-tertiary);
  text-transform: uppercase;
}

.add-folder-btn {
  background: transparent;
  border: none;
  cursor: pointer;
  color: var(--text-secondary);
  font-size: var(--fs-base);
  line-height: 1;
  border-radius: var(--radius-xs);
  padding: 2px 6px;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: var(--transition);
}

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

.folder-list {
  display: flex;
  flex-direction: column;
  gap: 2px;
  margin-top: 6px;
}

.folder-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 8px 12px;
  border-radius: var(--radius-sm);
  font-size: var(--fs-sm);
  font-weight: 500;
  color: var(--text-secondary);
  cursor: pointer;
  transition: var(--transition);
  position: relative;
  user-select: none;
}

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

.folder-item.active {
  background: var(--bg-card-hover);
  color: var(--text-primary);
  font-weight: 600;
}

.folder-item-left {
  display: flex;
  align-items: center;
  gap: 10px;
  min-width: 0;
}

.folder-item-icon {
  font-size: var(--fs-base);
  flex-shrink: 0;
}

.folder-item-name {
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.folder-item-right {
  display: flex;
  align-items: center;
  gap: 6px;
  margin-left: 8px;
}

.editor-footer {
  padding-top: 24px;
  margin-top: 24px;
  border-top: 1px dashed var(--border);
  display: flex;
  justify-content: flex-end;
}

.word-count {
  font-size: var(--fs-xs);
  color: var(--text-tertiary);
  font-weight: 500;
  letter-spacing: 0.02em;
}

.folder-count {
  font-size: var(--fs-xs);
  color: var(--text-tertiary);
  background: var(--bg-app);
  padding: 2px 6px;
  border-radius: 10px;
  border: 1px solid var(--border);
}

.folder-delete-btn {
  background: transparent;
  border: none;
  cursor: pointer;
  color: var(--text-tertiary);
  font-size: var(--fs-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-xs);
  padding: 2px;
  opacity: 0;
  transition: var(--transition);
}

.folder-item:hover .folder-delete-btn {
  opacity: 1;
}

.folder-delete-btn:hover {
  background: var(--red);
  color: #fff !important;
}

/* Folder Inline Input */
.folder-input-item {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 8px 12px;
  border-radius: var(--radius-sm);
  background: var(--bg-card);
  border: 1.5px solid var(--accent);
}

.folder-input-item input {
  width: 100%;
  border: none;
  background: transparent;
  outline: none;
  font-size: var(--fs-sm);
  color: var(--text-primary);
  font-family: var(--font-ui);
}

/* Sidebar Footer */
.sidebar-footer {
  padding: 16px 20px;
  border-top: 1px solid var(--border);
  display: flex;
  align-items: center;
  justify-content: space-between;
  background: var(--bg-sidebar);
}

.sidebar-theme-toggle {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: var(--fs-sm);
  font-weight: 500;
  color: var(--text-secondary);
  background: transparent;
  border: none;
  cursor: pointer;
  padding: 6px 12px;
  border-radius: var(--radius-sm);
  transition: var(--transition);
}

.sidebar-theme-toggle:hover {
  background: var(--bg-card-hover);
  color: var(--text-primary);
}

.sidebar-theme-icon {
  font-size: var(--fs-base);
}

/* ==========================================================================
   NOTES LIST PANE (Middle Column)
   ========================================================================== */

.notes-list-pane {
  background: var(--bg-list);
  border-right: 1px solid var(--border);
  display: flex;
  flex-direction: column;
  height: 100%;
  overflow: hidden;
  transition: var(--transition-slow);
}

.notes-list-header {
  padding: 0;
  display: flex;
  flex-direction: column;
  background: var(--bg-list);
}

.search-wrap {
  position: relative;
  display: flex;
  align-items: center;
  padding: 12px 16px;
  border-bottom: 1px solid var(--border);
}

.search-wrap input {
  width: 100%;
  padding: 8px 12px 8px 32px;
  border: none;
  background: transparent;
  outline: none;
  font-size: var(--fs-sm);
  color: var(--text-primary);
}

.search-icon {
  position: absolute;
  left: 16px;
  color: var(--text-tertiary);
  pointer-events: none;
  display: flex;
  align-items: center;
  justify-content: center;
}

.list-top-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 12px 16px;
  border-bottom: 1px solid var(--border);
}

.new-note-btn {
  display: flex;
  align-items: center;
  gap: 6px;
  background: var(--accent);
  color: white;
  border: none;
  padding: 6px 12px;
  border-radius: var(--radius-sm);
  font-weight: 500;
  font-size: var(--fs-sm);
  cursor: pointer;
  transition: var(--transition);
}

.new-note-btn:hover {
  background: var(--accent-hover);
  transform: translateY(-1px);
  box-shadow: 0 4px 12px rgba(91, 91, 214, 0.2);
}

.new-note-btn:active {
  transform: scale(0.98);
}

.list-pane-title {
  font-size: var(--fs-lg);
  font-weight: 700;
  color: var(--text-primary);
  font-family: var(--font-ui);
}

.list-filter-btn:hover {
  background: var(--bg-card-hover);
}

.search-wrap input:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px rgba(91, 91, 214, 0.15);
}

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

.search-icon {
  position: absolute;
  left: 12px;
  top: 50%;
  transform: translateY(-50%);
  font-size: var(--fs-sm);
  color: var(--text-tertiary);
  pointer-events: none;
}

.notes-list-stats {
  padding: 8px 20px;
  font-size: var(--fs-xs);
  font-weight: 600;
  color: var(--text-tertiary);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  background: var(--bg-sidebar);
  border-bottom: 1px solid var(--border);
}

/* Notes Cards Container */
.notes-list {
  flex: 1;
  overflow-y: auto;
  padding: 8px;
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.note-card {
  padding: 20px;
  border-radius: var(--radius-md);
  border: 1px solid transparent;
  background: transparent;
  cursor: pointer;
  position: relative;
  transition: var(--transition);
  transform: translateY(0);
}

.note-card:hover {
  background: var(--bg-card-hover);
  transform: translateY(-2px);
  box-shadow: var(--shadow-sm);
  border-color: var(--border);
}

.note-card.active {
  background: var(--bg-card-active);
  border-color: var(--border-focus);
}

.note-card-title {
  font-size: var(--fs-sm);
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 4px;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  padding-right: 24px;
}

.note-card-preview {
  font-size: var(--fs-xs);
  color: var(--text-secondary);
  line-height: 1.4;
  overflow: hidden;
  display: -webkit-box;
  -webkit-box-orient: vertical;
  -webkit-line-clamp: 2;
  line-clamp: 2;
  height: 2.8em;
}

.note-card-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-top: 8px;
}

.note-card-date {
  font-size: 10px;
  color: var(--text-tertiary);
  font-weight: 500;
  display: flex;
  align-items: center;
  gap: 6px;
}

.note-indicators {
  display: flex;
  gap: 4px;
  font-size: 12px;
}

.note-delete-btn {
  background: transparent;
  border: none;
  color: var(--text-tertiary);
  cursor: pointer;
  font-size: var(--fs-sm);
  padding: 2px;
  border-radius: var(--radius-xs);
  opacity: 0;
  transition: var(--transition);
  display: flex;
  align-items: center;
  justify-content: center;
}

.note-card:hover .note-delete-btn {
  opacity: 1;
}

.note-delete-btn:hover {
  background: var(--red);
  color: #fff !important;
}

.empty-notes {
  text-align: center;
  padding: 48px 24px;
  color: var(--text-tertiary);
}

.empty-notes .empty-icon {
  font-size: var(--fs-3xl);
  margin-bottom: 12px;
}

.empty-notes p {
  font-size: var(--fs-sm);
  line-height: 1.6;
}

/* ==========================================================================
   EDITOR AREA (Right Column)
   ========================================================================== */

.editor-area {
  display: flex;
  flex-direction: column;
  background: var(--bg-editor);
  height: 100%;
  overflow: hidden;
  position: relative;
}

/* Floating Distraction-Free Toggle */
.distraction-toggle-floating {
  position: absolute;
  top: 16px;
  left: 16px;
  z-index: 100;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  box-shadow: var(--shadow-sm);
  cursor: pointer;
  padding: 6px;
  display: none; /* Only visible in distraction free mode */
  align-items: center;
  justify-content: center;
  transition: var(--transition);
}

.app-container.distraction-free .distraction-toggle-floating {
  display: flex;
}

.distraction-toggle-floating:hover {
  background: var(--bg-card-hover);
}

/* Editor Header / Topbar */
.editor-topbar {
  background: var(--bg-editor);
  border-bottom: 1px solid var(--border);
  padding: 12px 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  flex-shrink: 0;
}

.editor-topbar-left {
  display: flex;
  align-items: center;
  gap: 12px;
  min-width: 0;
}

.mobile-menu-btn {
  display: none; /* Desktop hidden */
  background: transparent;
  border: none;
  cursor: pointer;
  color: var(--text-secondary);
  font-size: var(--fs-xl);
  padding: 4px;
  border-radius: var(--radius-sm);
  align-items: center;
  justify-content: center;
}

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

.editor-title-container {
  min-width: 0;
}

.editor-title-input {
  font-family: var(--font-title);
  font-size: var(--fs-xl);
  font-weight: 700;
  color: var(--text-primary);
  background: transparent;
  border: none;
  outline: none;
  width: 100%;
}

.editor-title-input::placeholder {
  color: var(--text-tertiary);
}

.folder-select {
  background: var(--bg-card);
  color: var(--text-secondary);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 4px 8px;
  font-size: var(--fs-xs);
  outline: none;
  cursor: pointer;
  transition: var(--transition);
}

.folder-select:hover, .folder-select:focus {
  border-color: var(--accent);
  color: var(--text-primary);
}

.editor-topbar-right {
  display: flex;
  align-items: center;
  gap: 8px;
  flex-shrink: 0;
}

/* Save Status */
.save-status-wrap {
  display: flex;
  align-items: center;
  gap: 6px;
  font-size: var(--fs-xs);
  color: var(--text-secondary);
  margin-right: 8px;
}

.status-dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--text-tertiary);
}

.status-dot.saved {
  background: var(--green);
}

.status-dot.unsaved {
  background: var(--accent);
  animation: pulse 1.4s infinite;
}

@keyframes pulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.4; }
}

/* Action Buttons */
.editor-action-btn {
  height: 34px;
  padding: 0 12px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border);
  background: var(--bg-card);
  color: var(--text-secondary);
  font-size: var(--fs-sm);
  font-weight: 600;
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: 6px;
  transition: var(--transition);
}

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

.editor-action-btn.primary {
  background: var(--accent);
  color: #fff;
  border-color: var(--accent);
  box-shadow: var(--shadow-sm);
}

.editor-action-btn.primary:hover {
  background: var(--accent-hover);
  border-color: var(--accent-hover);
  box-shadow: var(--shadow-md);
}

.editor-action-btn.danger:hover {
  background: var(--red);
  color: #fff;
  border-color: var(--red);
}

.icon-btn {
  padding: 0 8px;
  font-size: var(--fs-lg);
  border: 1px solid transparent;
  background: transparent;
}

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

.icon-btn.active {
  background: var(--accent-light);
  border-color: var(--accent-light-border);
}

/* Tags Bar */
.tags-bar {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 8px 24px;
  background: var(--bg-editor);
  border-bottom: 1px solid var(--border);
  overflow-x: auto;
}

.tags-list {
  display: flex;
  align-items: center;
  gap: 6px;
}

.tag-pill {
  background: var(--bg-card-hover);
  color: var(--text-secondary);
  font-size: 11px;
  padding: 2px 8px;
  border-radius: 12px;
  display: flex;
  align-items: center;
  gap: 4px;
  border: 1px solid var(--border);
}

.tag-pill button {
  background: transparent;
  border: none;
  cursor: pointer;
  color: var(--text-tertiary);
  font-size: 10px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.tag-pill button:hover {
  color: var(--red);
}

.tag-input {
  border: none;
  background: transparent;
  font-size: 12px;
  color: var(--text-primary);
  outline: none;
  min-width: 150px;
  font-family: var(--font-ui);
}

.tag-input::placeholder {
  color: var(--text-tertiary);
}

/* ==========================================================================
   FORMATTING TOOLBAR (Markdown/Rich Text styles)
   ========================================================================== */

.toolbar {
  background: var(--bg-sidebar);
  border-bottom: 1px solid var(--border);
  padding: 6px 24px;
  display: flex;
  align-items: center;
  gap: 4px;
  flex-shrink: 0;
  overflow-x: auto;
}

.toolbar-group {
  display: flex;
  align-items: center;
  gap: 2px;
  padding-right: 8px;
  margin-right: 8px;
  border-right: 1px solid var(--border);
}

.toolbar-group:last-child {
  border-right: none;
  margin-right: 0;
  padding-right: 0;
}

.toolbar-label {
  font-size: var(--fs-xs);
  font-weight: 600;
  color: var(--text-tertiary);
  margin-right: 6px;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  white-space: nowrap;
}

.format-btn {
  width: 30px;
  height: 30px;
  border-radius: var(--radius-sm);
  border: 1px solid transparent;
  background: transparent;
  color: var(--text-secondary);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: var(--transition);
}

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

.format-btn.active {
  background: var(--bg-card-active);
  color: var(--accent);
  border-color: var(--accent-light-border);
}

/* Dropdowns & Pickers inside Toolbar */
.size-select {
  height: 30px;
  padding: 0 6px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border);
  background: var(--bg-card);
  font-size: var(--fs-xs);
  font-weight: 600;
  color: var(--text-secondary);
  outline: none;
  cursor: pointer;
  transition: var(--transition);
}

.size-select:hover {
  border-color: var(--text-tertiary);
}

.color-picker-wrap {
  position: relative;
  width: 30px;
  height: 30px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.color-input {
  width: 24px;
  height: 24px;
  border-radius: 50%;
  border: 1.5px solid var(--border);
  padding: 0;
  cursor: pointer;
  background: var(--bg-card);
  transition: var(--transition);
  overflow: hidden;
}

.color-input::-webkit-color-swatch-wrapper {
  padding: 0;
}
.color-input::-webkit-color-swatch {
  border: none;
  border-radius: 50%;
}

.color-input:hover {
  transform: scale(1.1);
  border-color: var(--accent);
}

/* ==========================================================================
   EDITOR MAIN (Distraction-Free Sheet)
   ========================================================================== */

.editor-main {
  flex: 1;
  overflow-y: auto;
  padding: 40px 24px;
  display: flex;
  justify-content: center;
}

.editor-sheet {
  width: 100%;
  max-width: 760px;
  display: flex;
  flex-direction: column;
}

/* Contenteditable Rich Text Area */
#note-content {
  width: 100%;
  min-height: 500px;
  background: transparent;
  border: none;
  outline: none;
  font-family: var(--font-editor);
  font-size: var(--fs-base);
  color: var(--text-primary);
  line-height: 1.8;
  resize: none;
  transition: var(--transition);
}

/* Placeholder for contenteditable */
#note-content:empty::before {
  content: attr(placeholder);
  color: var(--text-tertiary);
  pointer-events: none;
}

/* HTML Styling Inside Contenteditable */
#note-content h1, 
#note-content h2, 
#note-content h3, 
#note-content h4 {
  font-family: var(--font-title);
  color: var(--text-primary);
  margin-top: 1.5em;
  margin-bottom: 0.5em;
  font-weight: 700;
  line-height: 1.3;
}

#note-content h3 { font-size: 1.4rem; } /* Custom Heading 1 */
#note-content h4 { font-size: 1.15rem; } /* Custom Heading 2 */

#note-content p {
  margin-bottom: 1em;
}

#note-content ul, 
#note-content ol {
  margin-left: 24px;
  margin-bottom: 1em;
}

#note-content li {
  margin-bottom: 0.25em;
}

/* Editor Footer */
.editor-footer {
  padding: 12px 24px;
  background: var(--bg-sidebar);
  border-top: 1px solid var(--border);
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: var(--fs-xs);
  color: var(--text-secondary);
  flex-shrink: 0;
}

.word-count {
  font-weight: 500;
}

/* ==========================================================================
   WELCOME SCREEN
   ========================================================================== */

.welcome-screen {
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: 48px;
  color: var(--text-tertiary);
  background: var(--bg-editor);
}

.welcome-illustration {
  margin-bottom: 24px;
}

.welcome-screen h2 {
  font-family: var(--font-title);
  font-size: var(--fs-2xl);
  color: var(--text-primary);
  margin-bottom: 8px;
  font-weight: 800;
  letter-spacing: -0.02em;
}

.welcome-screen p {
  font-size: var(--fs-base);
  color: var(--text-secondary);
  line-height: 1.6;
  max-width: 320px;
  margin-bottom: 32px;
}

.welcome-actions {
  display: flex;
  gap: 12px;
  margin-bottom: 48px;
}

.welcome-action-btn {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 10px 16px;
  border-radius: var(--radius-md);
  font-weight: 600;
  font-size: var(--fs-sm);
  cursor: pointer;
  transition: var(--transition);
  background: var(--bg-card);
  border: 1px solid var(--border);
  color: var(--text-primary);
}

.welcome-action-btn:hover {
  background: var(--bg-card-hover);
  border-color: var(--text-tertiary);
}

.welcome-action-btn.primary {
  background: var(--accent);
  color: white;
  border-color: var(--accent);
  box-shadow: 0 4px 12px rgba(91, 91, 214, 0.2);
}

.welcome-action-btn.primary:hover {
  background: var(--accent-hover);
  border-color: var(--accent-hover);
  box-shadow: 0 6px 16px rgba(91, 91, 214, 0.3);
  transform: translateY(-1px);
}

.welcome-action-btn.primary:active {
  transform: scale(0.98);
}

.getting-started {
  width: 100%;
  max-width: 480px;
  text-align: left;
}

.getting-started h3 {
  font-size: var(--fs-sm);
  font-weight: 600;
  color: var(--text-tertiary);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: 16px;
}

.getting-started-steps {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.step-card {
  display: flex;
  align-items: center;
  gap: 16px;
  background: var(--bg-card);
  padding: 16px;
  border-radius: var(--radius-md);
  border: 1px solid var(--border);
  transition: var(--transition);
}

.step-card:hover {
  border-color: var(--border-focus);
  transform: translateX(2px);
}

.step-icon {
  font-size: var(--fs-xl);
  background: var(--accent-light);
  width: 40px;
  height: 40px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-sm);
  border: 1px solid var(--accent-light-border);
}

.step-text {
  font-weight: 600;
  color: var(--text-primary);
  font-size: var(--fs-sm);
}

.step-text span {
  display: block;
  font-weight: 400;
  color: var(--text-secondary);
  font-size: var(--fs-xs);
  margin-top: 2px;
}

/* ==========================================================================
   TOAST NOTIFICATION
   ========================================================================== */

.toast {
  position: fixed;
  bottom: 24px;
  right: 24px;
  padding: 12px 18px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-lg);
  font-size: var(--fs-sm);
  font-weight: 600;
  color: var(--text-primary);
  display: flex;
  align-items: center;
  gap: 8px;
  z-index: 1000;
  transform: translateY(80px);
  opacity: 0;
  transition: all 0.3s cubic-bezier(0.34, 1.56, 0.64, 1);
}

.toast.show {
  transform: translateY(0);
  opacity: 1;
}

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

.toast.error {
  border-left: 4px solid var(--red);
}

/* ==========================================================================
   MODAL DIALOG (Confirm dialogs)
   ========================================================================== */

.modal-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.4);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 2000;
  opacity: 0;
  visibility: hidden;
  transition: var(--transition);
  backdrop-filter: blur(2px);
}

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

.modal {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: 24px;
  width: 360px;
  max-width: calc(100vw - 32px);
  box-shadow: var(--shadow-lg);
  transform: scale(0.95);
  transition: transform 0.2s cubic-bezier(0.34, 1.56, 0.64, 1);
}

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

.modal h3 {
  font-family: var(--font-title);
  font-size: var(--fs-lg);
  margin-bottom: 8px;
  font-weight: 700;
  color: var(--text-primary);
}

.modal p {
  font-size: var(--fs-sm);
  color: var(--text-secondary);
  line-height: 1.5;
  margin-bottom: 20px;
}

.modal-actions {
  display: flex;
  gap: 8px;
  justify-content: flex-end;
}

.btn {
  height: 36px;
  padding: 0 14px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border);
  background: var(--bg-card);
  color: var(--text-secondary);
  font-size: var(--fs-sm);
  font-weight: 600;
  cursor: pointer;
  transition: var(--transition);
}

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

.btn-danger {
  background: var(--red);
  color: #fff;
  border-color: var(--red);
}

.btn-danger:hover {
  background: #b71c1c;
  border-color: #b71c1c;
}

/* ==========================================================================
   RESPONSIVE DESIGN (Mobile & Tablet Drawer switching)
   ========================================================================== */

@media (max-width: 900px) {
  /* Tablet optimization: decrease sidebar and list sizes */
  .app-container {
    grid-template-columns: 220px 280px 1fr;
  }
}

@media (max-width: 768px) {
  /* Mobile 3-Pane View Switching Layout */
  .app-container {
    grid-template-columns: 1fr; /* Single column view */
  }

  /* Hide all columns by default */
  .sidebar, 
  .notes-list-pane, 
  .editor-area {
    display: none !important;
  }

  /* View: Sidebar overlay */
  [data-mobile-view="sidebar"] .sidebar {
    display: flex !important;
    position: fixed;
    inset: 0;
    width: 280px !important;
    max-width: 80% !important;
    z-index: 1000;
    box-shadow: var(--shadow-lg);
    animation: slideInLeft 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  }

  /* Dim background mask overlay when sidebar is active */
  [data-mobile-view="sidebar"]::after {
    content: '';
    position: fixed;
    inset: 0;
    background: rgba(0,0,0,0.4);
    z-index: 999;
    backdrop-filter: blur(1px);
  }

  /* Show list pane when active */
  [data-mobile-view="list"] .notes-list-pane {
    display: flex !important;
    width: 100% !important;
  }

  /* Show editor pane when active */
  [data-mobile-view="editor"] .editor-area {
    display: flex !important;
    width: 100% !important;
  }

  /* Mobile Elements Visibility */
  .mobile-menu-btn {
    display: flex;
  }

  /* Adjust Editor Page Spacing */
  .editor-main {
    padding: 24px 16px;
  }
}

@media (max-width: 480px) {
  .toolbar {
    gap: 2px;
  }
}

@keyframes slideInLeft {
  from { transform: translateX(-100%); }
  to { transform: translateX(0); }
}