/**
 * Anytype AI - Main Stylesheet
 * Privacy-first knowledge management platform
 *
 * Design System:
 * - Dark theme primary
 * - Clean, professional aesthetic
 * - Focus on readability and minimal distraction
 */

/* ==========================================================================
   CSS Custom Properties (Design Tokens)
   ========================================================================== */

:root {
  /* Color Palette - Dark Theme */
  --color-bg-primary: #0d0d0d;
  --color-bg-secondary: #141414;
  --color-bg-tertiary: #1a1a1a;
  --color-bg-elevated: #222222;
  --color-bg-hover: #2a2a2a;

  /* Surface colors */
  --color-surface-card: #181818;
  --color-surface-modal: #1e1e1e;
  --color-surface-input: #1a1a1a;

  /* Border colors */
  --color-border-subtle: #2a2a2a;
  --color-border-default: #333333;
  --color-border-strong: #444444;
  --color-border-focus: #5c6bc0;

  /* Text colors */
  --color-text-primary: #f5f5f5;
  --color-text-secondary: #a0a0a0;
  --color-text-tertiary: #6b6b6b;
  --color-text-muted: #4a4a4a;
  --color-text-inverse: #0d0d0d;

  /* Accent colors - Indigo/Purple for AI/Intelligence feel */
  --color-accent-primary: #5c6bc0;
  --color-accent-primary-hover: #7986cb;
  --color-accent-primary-muted: rgba(92, 107, 192, 0.15);
  --color-accent-secondary: #7c4dff;

  /* Semantic colors */
  --color-success: #4caf50;
  --color-success-muted: rgba(76, 175, 80, 0.15);
  --color-warning: #ff9800;
  --color-warning-muted: rgba(255, 152, 0, 0.15);
  --color-error: #f44336;
  --color-error-muted: rgba(244, 67, 54, 0.15);
  --color-info: #2196f3;
  --color-info-muted: rgba(33, 150, 243, 0.15);

  /* Tag colors */
  --tag-blue: #3b82f6;
  --tag-green: #22c55e;
  --tag-purple: #a855f7;
  --tag-orange: #f97316;
  --tag-pink: #ec4899;
  --tag-cyan: #06b6d4;
  --tag-yellow: #eab308;
  --tag-red: #ef4444;

  /* Typography */
  --font-family-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --font-family-mono: 'JetBrains Mono', 'Fira Code', 'SF Mono', Consolas, monospace;

  --font-size-xs: 0.75rem;     /* 12px */
  --font-size-sm: 0.875rem;    /* 14px */
  --font-size-base: 1rem;      /* 16px */
  --font-size-lg: 1.125rem;    /* 18px */
  --font-size-xl: 1.25rem;     /* 20px */
  --font-size-2xl: 1.5rem;     /* 24px */
  --font-size-3xl: 1.875rem;   /* 30px */
  --font-size-4xl: 2.25rem;    /* 36px */

  --font-weight-normal: 400;
  --font-weight-medium: 500;
  --font-weight-semibold: 600;
  --font-weight-bold: 700;

  --line-height-tight: 1.25;
  --line-height-normal: 1.5;
  --line-height-relaxed: 1.75;

  /* Spacing */
  --space-1: 0.25rem;   /* 4px */
  --space-2: 0.5rem;    /* 8px */
  --space-3: 0.75rem;   /* 12px */
  --space-4: 1rem;      /* 16px */
  --space-5: 1.25rem;   /* 20px */
  --space-6: 1.5rem;    /* 24px */
  --space-8: 2rem;      /* 32px */
  --space-10: 2.5rem;   /* 40px */
  --space-12: 3rem;     /* 48px */
  --space-16: 4rem;     /* 64px */

  /* Border radius */
  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-lg: 12px;
  --radius-xl: 16px;
  --radius-full: 9999px;

  /* Shadows */
  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.3);
  --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.4);
  --shadow-lg: 0 10px 15px rgba(0, 0, 0, 0.5);
  --shadow-xl: 0 20px 25px rgba(0, 0, 0, 0.6);
  --shadow-glow: 0 0 20px rgba(92, 107, 192, 0.3);

  /* Transitions */
  --transition-fast: 150ms ease;
  --transition-base: 200ms ease;
  --transition-slow: 300ms ease;

  /* Layout */
  --sidebar-width: 280px;
  --sidebar-collapsed-width: 64px;
  --ai-panel-width: 360px;
  --header-height: 64px;
  --max-content-width: 800px;
}

/* ==========================================================================
   Reset & Base Styles
   ========================================================================== */

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

html {
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  font-family: var(--font-family-sans);
  font-size: var(--font-size-base);
  line-height: var(--line-height-normal);
  color: var(--color-text-primary);
  background-color: var(--color-bg-primary);
  min-height: 100vh;
}

a {
  color: var(--color-accent-primary);
  text-decoration: none;
  transition: color var(--transition-fast);
}

a:hover {
  color: var(--color-accent-primary-hover);
}

img {
  max-width: 100%;
  height: auto;
}

button {
  font-family: inherit;
  cursor: pointer;
}

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

/* ==========================================================================
   Typography
   ========================================================================== */

h1, h2, h3, h4, h5, h6 {
  font-weight: var(--font-weight-semibold);
  line-height: var(--line-height-tight);
  color: var(--color-text-primary);
}

h1 { font-size: var(--font-size-4xl); }
h2 { font-size: var(--font-size-3xl); }
h3 { font-size: var(--font-size-2xl); }
h4 { font-size: var(--font-size-xl); }
h5 { font-size: var(--font-size-lg); }
h6 { font-size: var(--font-size-base); }

.text-muted { color: var(--color-text-secondary); }
.text-small { font-size: var(--font-size-sm); }
.text-xs { font-size: var(--font-size-xs); }

/* ==========================================================================
   Layout Components
   ========================================================================== */

.app-container {
  display: flex;
  min-height: 100vh;
}

/* Sidebar Navigation */
.sidebar {
  width: var(--sidebar-width);
  background-color: var(--color-bg-secondary);
  border-right: 1px solid var(--color-border-subtle);
  display: flex;
  flex-direction: column;
  position: fixed;
  top: 0;
  left: 0;
  bottom: 0;
  z-index: 100;
  transition: transform var(--transition-base);
}

.sidebar-header {
  padding: var(--space-5);
  border-bottom: 1px solid var(--color-border-subtle);
}

.sidebar-logo {
  display: flex;
  align-items: center;
  gap: var(--space-3);
}

.sidebar-logo-icon {
  width: 32px;
  height: 32px;
  background: linear-gradient(135deg, var(--color-accent-primary), var(--color-accent-secondary));
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
}

.sidebar-logo-text {
  font-size: var(--font-size-lg);
  font-weight: var(--font-weight-bold);
  color: var(--color-text-primary);
}

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

.sidebar-content {
  flex: 1;
  overflow-y: auto;
  padding: var(--space-4);
}

.sidebar-section {
  margin-bottom: var(--space-6);
}

.sidebar-section-title {
  font-size: var(--font-size-xs);
  font-weight: var(--font-weight-semibold);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--color-text-tertiary);
  padding: var(--space-2) var(--space-3);
  margin-bottom: var(--space-2);
}

.sidebar-nav {
  list-style: none;
}

.sidebar-nav-item {
  margin-bottom: var(--space-1);
}

.sidebar-nav-link {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  padding: var(--space-3);
  border-radius: var(--radius-md);
  color: var(--color-text-secondary);
  transition: all var(--transition-fast);
}

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

.sidebar-nav-link.active {
  background-color: var(--color-accent-primary-muted);
  color: var(--color-accent-primary);
}

.sidebar-nav-icon {
  width: 20px;
  height: 20px;
  opacity: 0.7;
}

.sidebar-nav-link:hover .sidebar-nav-icon,
.sidebar-nav-link.active .sidebar-nav-icon {
  opacity: 1;
}

/* Notes list in sidebar */
.notes-list {
  list-style: none;
}

.note-list-item {
  display: flex;
  align-items: flex-start;
  gap: var(--space-3);
  padding: var(--space-3);
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: all var(--transition-fast);
}

.note-list-item:hover {
  background-color: var(--color-bg-hover);
}

.note-list-item.active {
  background-color: var(--color-accent-primary-muted);
}

.note-list-icon {
  width: 16px;
  height: 16px;
  margin-top: 2px;
  color: var(--color-text-tertiary);
}

.note-list-content {
  flex: 1;
  min-width: 0;
}

.note-list-title {
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-medium);
  color: var(--color-text-primary);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.note-list-date {
  font-size: var(--font-size-xs);
  color: var(--color-text-tertiary);
  margin-top: var(--space-1);
}

/* Tag cloud */
.tag-cloud {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
}

.tag {
  display: inline-flex;
  align-items: center;
  gap: var(--space-1);
  padding: var(--space-1) var(--space-3);
  background-color: var(--color-bg-elevated);
  border-radius: var(--radius-full);
  font-size: var(--font-size-xs);
  font-weight: var(--font-weight-medium);
  color: var(--color-text-secondary);
  transition: all var(--transition-fast);
  cursor: pointer;
}

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

.tag.active {
  background-color: var(--color-accent-primary);
  color: white;
}

.tag-count {
  background-color: var(--color-bg-tertiary);
  padding: 0 var(--space-2);
  border-radius: var(--radius-full);
  font-size: var(--font-size-xs);
}

/* Colored tags */
.tag[data-color="blue"] { background-color: rgba(59, 130, 246, 0.2); color: var(--tag-blue); }
.tag[data-color="green"] { background-color: rgba(34, 197, 94, 0.2); color: var(--tag-green); }
.tag[data-color="purple"] { background-color: rgba(168, 85, 247, 0.2); color: var(--tag-purple); }
.tag[data-color="orange"] { background-color: rgba(249, 115, 22, 0.2); color: var(--tag-orange); }
.tag[data-color="pink"] { background-color: rgba(236, 72, 153, 0.2); color: var(--tag-pink); }
.tag[data-color="cyan"] { background-color: rgba(6, 182, 212, 0.2); color: var(--tag-cyan); }

/* Sidebar footer */
.sidebar-footer {
  padding: var(--space-4);
  border-top: 1px solid var(--color-border-subtle);
}

.privacy-badge {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-3);
  background-color: var(--color-success-muted);
  border-radius: var(--radius-md);
  font-size: var(--font-size-xs);
  color: var(--color-success);
}

.privacy-badge-icon {
  width: 16px;
  height: 16px;
}

/* Main content area */
.main-content {
  flex: 1;
  margin-left: var(--sidebar-width);
  display: flex;
  flex-direction: column;
  min-height: 100vh;
}

/* Header */
.header {
  height: var(--header-height);
  background-color: var(--color-bg-secondary);
  border-bottom: 1px solid var(--color-border-subtle);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 var(--space-6);
  position: sticky;
  top: 0;
  z-index: 50;
}

.header-left {
  display: flex;
  align-items: center;
  gap: var(--space-4);
}

.menu-toggle {
  display: none;
  background: none;
  border: none;
  padding: var(--space-2);
  color: var(--color-text-secondary);
}

/* Search bar */
.search-container {
  position: relative;
  width: 100%;
  max-width: 480px;
}

.search-input {
  width: 100%;
  padding: var(--space-3) var(--space-4);
  padding-left: var(--space-10);
  background-color: var(--color-surface-input);
  border: 1px solid var(--color-border-subtle);
  border-radius: var(--radius-lg);
  color: var(--color-text-primary);
  font-size: var(--font-size-sm);
  transition: all var(--transition-fast);
}

.search-input:focus {
  outline: none;
  border-color: var(--color-accent-primary);
  box-shadow: 0 0 0 3px var(--color-accent-primary-muted);
}

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

.search-icon {
  position: absolute;
  left: var(--space-4);
  top: 50%;
  transform: translateY(-50%);
  width: 18px;
  height: 18px;
  color: var(--color-text-tertiary);
}

.search-hint {
  position: absolute;
  right: var(--space-3);
  top: 50%;
  transform: translateY(-50%);
  display: flex;
  align-items: center;
  gap: var(--space-1);
  padding: var(--space-1) var(--space-2);
  background-color: var(--color-bg-elevated);
  border-radius: var(--radius-sm);
  font-size: var(--font-size-xs);
  color: var(--color-text-tertiary);
}

.search-hint kbd {
  background-color: var(--color-bg-tertiary);
  padding: 0 var(--space-1);
  border-radius: 3px;
  font-family: var(--font-family-mono);
}

.header-actions {
  display: flex;
  align-items: center;
  gap: var(--space-3);
}

/* Content area */
.content {
  flex: 1;
  padding: var(--space-8);
}

.content-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: var(--space-8);
}

.content-title {
  font-size: var(--font-size-2xl);
  font-weight: var(--font-weight-semibold);
}

/* ==========================================================================
   Buttons
   ========================================================================== */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  padding: var(--space-3) var(--space-5);
  border-radius: var(--radius-md);
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-medium);
  border: none;
  transition: all var(--transition-fast);
  cursor: pointer;
}

.btn-primary {
  background-color: var(--color-accent-primary);
  color: white;
}

.btn-primary:hover {
  background-color: var(--color-accent-primary-hover);
}

.btn-secondary {
  background-color: var(--color-bg-elevated);
  color: var(--color-text-primary);
  border: 1px solid var(--color-border-default);
}

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

.btn-ghost {
  background-color: transparent;
  color: var(--color-text-secondary);
}

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

.btn-danger {
  background-color: var(--color-error);
  color: white;
}

.btn-danger:hover {
  background-color: #d32f2f;
}

.btn-sm {
  padding: var(--space-2) var(--space-3);
  font-size: var(--font-size-xs);
}

.btn-lg {
  padding: var(--space-4) var(--space-6);
  font-size: var(--font-size-base);
}

.btn-icon {
  width: 40px;
  height: 40px;
  padding: 0;
  border-radius: var(--radius-md);
}

.btn-icon.btn-sm {
  width: 32px;
  height: 32px;
}

/* Floating action button */
.fab {
  position: fixed;
  bottom: var(--space-8);
  right: var(--space-8);
  width: 56px;
  height: 56px;
  border-radius: var(--radius-full);
  background: linear-gradient(135deg, var(--color-accent-primary), var(--color-accent-secondary));
  color: white;
  border: none;
  box-shadow: var(--shadow-lg), var(--shadow-glow);
  cursor: pointer;
  transition: all var(--transition-fast);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 100;
}

.fab:hover {
  transform: scale(1.05);
  box-shadow: var(--shadow-xl), 0 0 30px rgba(92, 107, 192, 0.5);
}

.fab-icon {
  width: 24px;
  height: 24px;
}

/* ==========================================================================
   Cards
   ========================================================================== */

.card {
  background-color: var(--color-surface-card);
  border: 1px solid var(--color-border-subtle);
  border-radius: var(--radius-lg);
  overflow: hidden;
  transition: all var(--transition-fast);
}

.card:hover {
  border-color: var(--color-border-default);
  box-shadow: var(--shadow-md);
}

.card-header {
  padding: var(--space-4) var(--space-5);
  border-bottom: 1px solid var(--color-border-subtle);
}

.card-body {
  padding: var(--space-5);
}

.card-footer {
  padding: var(--space-4) var(--space-5);
  border-top: 1px solid var(--color-border-subtle);
  background-color: var(--color-bg-tertiary);
}

/* Note cards grid */
.notes-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: var(--space-5);
}

.note-card {
  cursor: pointer;
}

.note-card-title {
  font-size: var(--font-size-lg);
  font-weight: var(--font-weight-semibold);
  margin-bottom: var(--space-2);
  color: var(--color-text-primary);
}

.note-card-excerpt {
  font-size: var(--font-size-sm);
  color: var(--color-text-secondary);
  line-height: var(--line-height-relaxed);
  display: -webkit-box;
  -webkit-line-clamp: 3;
  -webkit-box-orient: vertical;
  overflow: hidden;
  margin-bottom: var(--space-4);
}

.note-card-meta {
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: var(--font-size-xs);
  color: var(--color-text-tertiary);
}

.note-card-tags {
  display: flex;
  gap: var(--space-2);
  flex-wrap: wrap;
}

/* ==========================================================================
   Note Editor
   ========================================================================== */

.editor-container {
  display: flex;
  flex: 1;
  gap: 0;
}

.editor-main {
  flex: 1;
  display: flex;
  flex-direction: column;
  max-width: var(--max-content-width);
  margin: 0 auto;
  padding: var(--space-8);
}

.editor-header {
  margin-bottom: var(--space-6);
}

.editor-title-input {
  width: 100%;
  padding: var(--space-4);
  background-color: transparent;
  border: none;
  font-size: var(--font-size-3xl);
  font-weight: var(--font-weight-bold);
  color: var(--color-text-primary);
  line-height: var(--line-height-tight);
}

.editor-title-input:focus {
  outline: none;
}

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

.editor-meta {
  display: flex;
  align-items: center;
  gap: var(--space-4);
  padding: var(--space-2) var(--space-4);
  font-size: var(--font-size-sm);
  color: var(--color-text-tertiary);
}

.editor-tag-selector {
  display: flex;
  align-items: center;
  gap: var(--space-2);
}

.add-tag-btn {
  display: inline-flex;
  align-items: center;
  gap: var(--space-1);
  padding: var(--space-1) var(--space-2);
  background-color: var(--color-bg-elevated);
  border: 1px dashed var(--color-border-default);
  border-radius: var(--radius-full);
  font-size: var(--font-size-xs);
  color: var(--color-text-tertiary);
  cursor: pointer;
  transition: all var(--transition-fast);
}

.add-tag-btn:hover {
  border-color: var(--color-accent-primary);
  color: var(--color-accent-primary);
}

/* Editor toolbar */
.editor-toolbar {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-3);
  background-color: var(--color-bg-secondary);
  border: 1px solid var(--color-border-subtle);
  border-radius: var(--radius-md);
  margin-bottom: var(--space-4);
}

.toolbar-group {
  display: flex;
  align-items: center;
  gap: var(--space-1);
}

.toolbar-divider {
  width: 1px;
  height: 24px;
  background-color: var(--color-border-default);
  margin: 0 var(--space-2);
}

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

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

.toolbar-btn.active {
  background-color: var(--color-accent-primary-muted);
  color: var(--color-accent-primary);
}

.view-toggle {
  display: flex;
  background-color: var(--color-bg-tertiary);
  border-radius: var(--radius-md);
  padding: 2px;
}

.view-toggle-btn {
  padding: var(--space-2) var(--space-3);
  background: none;
  border: none;
  border-radius: var(--radius-sm);
  font-size: var(--font-size-xs);
  font-weight: var(--font-weight-medium);
  color: var(--color-text-tertiary);
  cursor: pointer;
  transition: all var(--transition-fast);
}

.view-toggle-btn.active {
  background-color: var(--color-bg-elevated);
  color: var(--color-text-primary);
  box-shadow: var(--shadow-sm);
}

/* Editor content area */
.editor-content {
  display: flex;
  flex: 1;
  gap: var(--space-4);
}

.editor-pane {
  flex: 1;
  display: flex;
  flex-direction: column;
}

.editor-pane-header {
  padding: var(--space-2) var(--space-3);
  background-color: var(--color-bg-secondary);
  border: 1px solid var(--color-border-subtle);
  border-bottom: none;
  border-radius: var(--radius-md) var(--radius-md) 0 0;
  font-size: var(--font-size-xs);
  font-weight: var(--font-weight-medium);
  color: var(--color-text-tertiary);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.editor-textarea {
  flex: 1;
  padding: var(--space-4);
  background-color: var(--color-surface-input);
  border: 1px solid var(--color-border-subtle);
  border-radius: 0 0 var(--radius-md) var(--radius-md);
  color: var(--color-text-primary);
  font-family: var(--font-family-mono);
  font-size: var(--font-size-sm);
  line-height: var(--line-height-relaxed);
  resize: none;
  min-height: 400px;
}

.editor-textarea:focus {
  outline: none;
  border-color: var(--color-accent-primary);
}

/* Preview pane */
.preview-pane {
  flex: 1;
  padding: var(--space-4);
  background-color: var(--color-surface-input);
  border: 1px solid var(--color-border-subtle);
  border-radius: 0 0 var(--radius-md) var(--radius-md);
  overflow-y: auto;
}

.preview-content {
  color: var(--color-text-primary);
  line-height: var(--line-height-relaxed);
}

.preview-content h1,
.preview-content h2,
.preview-content h3 {
  margin-top: var(--space-6);
  margin-bottom: var(--space-3);
}

.preview-content h1:first-child,
.preview-content h2:first-child,
.preview-content h3:first-child {
  margin-top: 0;
}

.preview-content p {
  margin-bottom: var(--space-4);
}

.preview-content code {
  background-color: var(--color-bg-elevated);
  padding: var(--space-1) var(--space-2);
  border-radius: var(--radius-sm);
  font-family: var(--font-family-mono);
  font-size: 0.9em;
}

.preview-content pre {
  background-color: var(--color-bg-elevated);
  padding: var(--space-4);
  border-radius: var(--radius-md);
  overflow-x: auto;
  margin-bottom: var(--space-4);
}

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

.preview-content ul,
.preview-content ol {
  margin-bottom: var(--space-4);
  padding-left: var(--space-6);
}

.preview-content li {
  margin-bottom: var(--space-2);
}

.preview-content blockquote {
  border-left: 3px solid var(--color-accent-primary);
  padding-left: var(--space-4);
  margin: var(--space-4) 0;
  color: var(--color-text-secondary);
  font-style: italic;
}

/* Editor actions */
.editor-actions {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--space-4);
  margin-top: var(--space-4);
  background-color: var(--color-bg-secondary);
  border-radius: var(--radius-md);
}

.editor-actions-left {
  display: flex;
  align-items: center;
  gap: var(--space-3);
}

.editor-actions-right {
  display: flex;
  align-items: center;
  gap: var(--space-3);
}

.save-status {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  font-size: var(--font-size-sm);
  color: var(--color-text-tertiary);
}

.save-status.saving {
  color: var(--color-warning);
}

.save-status.saved {
  color: var(--color-success);
}

/* ==========================================================================
   AI Assistant Panel
   ========================================================================== */

.ai-panel {
  width: var(--ai-panel-width);
  background-color: var(--color-bg-secondary);
  border-left: 1px solid var(--color-border-subtle);
  display: flex;
  flex-direction: column;
  position: fixed;
  top: var(--header-height);
  right: 0;
  bottom: 0;
  z-index: 90;
  transform: translateX(0);
  transition: transform var(--transition-base);
}

.ai-panel.collapsed {
  transform: translateX(100%);
}

.ai-panel-header {
  padding: var(--space-4) var(--space-5);
  border-bottom: 1px solid var(--color-border-subtle);
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.ai-panel-title {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  font-size: var(--font-size-base);
  font-weight: var(--font-weight-semibold);
}

.ai-icon {
  width: 20px;
  height: 20px;
  color: var(--color-accent-primary);
}

.ai-panel-actions {
  display: flex;
  gap: var(--space-2);
}

.ai-panel-content {
  flex: 1;
  overflow-y: auto;
  padding: var(--space-4);
}

/* AI Quick actions */
.ai-quick-actions {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
  margin-bottom: var(--space-6);
}

.ai-action-btn {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  padding: var(--space-3) var(--space-4);
  background-color: var(--color-bg-tertiary);
  border: 1px solid var(--color-border-subtle);
  border-radius: var(--radius-md);
  color: var(--color-text-secondary);
  font-size: var(--font-size-sm);
  text-align: left;
  cursor: pointer;
  transition: all var(--transition-fast);
}

.ai-action-btn:hover {
  background-color: var(--color-bg-hover);
  border-color: var(--color-accent-primary);
  color: var(--color-text-primary);
}

.ai-action-icon {
  width: 18px;
  height: 18px;
  color: var(--color-accent-primary);
}

/* AI search input */
.ai-search {
  margin-bottom: var(--space-6);
}

.ai-search-label {
  display: block;
  font-size: var(--font-size-xs);
  font-weight: var(--font-weight-medium);
  color: var(--color-text-tertiary);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: var(--space-2);
}

.ai-search-input {
  width: 100%;
  padding: var(--space-3) var(--space-4);
  background-color: var(--color-surface-input);
  border: 1px solid var(--color-border-subtle);
  border-radius: var(--radius-md);
  color: var(--color-text-primary);
  font-size: var(--font-size-sm);
  resize: none;
  min-height: 80px;
}

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

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

.ai-search-submit {
  margin-top: var(--space-2);
  width: 100%;
}

/* AI Results */
.ai-results {
  border-top: 1px solid var(--color-border-subtle);
  padding-top: var(--space-4);
}

.ai-results-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: var(--space-4);
}

.ai-results-title {
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-semibold);
  color: var(--color-text-secondary);
}

.ai-result-item {
  padding: var(--space-3);
  background-color: var(--color-bg-tertiary);
  border-radius: var(--radius-md);
  margin-bottom: var(--space-3);
  cursor: pointer;
  transition: all var(--transition-fast);
}

.ai-result-item:hover {
  background-color: var(--color-bg-hover);
}

.ai-result-title {
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-medium);
  color: var(--color-text-primary);
  margin-bottom: var(--space-1);
}

.ai-result-excerpt {
  font-size: var(--font-size-xs);
  color: var(--color-text-tertiary);
  line-height: var(--line-height-normal);
}

.ai-result-relevance {
  display: flex;
  align-items: center;
  gap: var(--space-1);
  margin-top: var(--space-2);
  font-size: var(--font-size-xs);
  color: var(--color-accent-primary);
}

/* AI Summary */
.ai-summary {
  background-color: var(--color-accent-primary-muted);
  border: 1px solid var(--color-accent-primary);
  border-radius: var(--radius-md);
  padding: var(--space-4);
}

.ai-summary-header {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-semibold);
  color: var(--color-accent-primary);
  margin-bottom: var(--space-3);
}

.ai-summary-content {
  font-size: var(--font-size-sm);
  color: var(--color-text-primary);
  line-height: var(--line-height-relaxed);
}

/* AI toggle button for collapsed state */
.ai-toggle-btn {
  position: fixed;
  top: calc(var(--header-height) + var(--space-4));
  right: var(--space-4);
  z-index: 85;
  display: flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-2) var(--space-4);
  background: linear-gradient(135deg, var(--color-accent-primary), var(--color-accent-secondary));
  border: none;
  border-radius: var(--radius-full);
  color: white;
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-medium);
  cursor: pointer;
  box-shadow: var(--shadow-md), var(--shadow-glow);
  transition: all var(--transition-fast);
}

.ai-toggle-btn:hover {
  transform: scale(1.02);
}

.ai-toggle-btn.hidden {
  display: none;
}

/* ==========================================================================
   Empty States
   ========================================================================== */

.empty-state {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: var(--space-16);
  text-align: center;
}

.empty-state-icon {
  width: 64px;
  height: 64px;
  color: var(--color-text-tertiary);
  margin-bottom: var(--space-4);
}

.empty-state-title {
  font-size: var(--font-size-xl);
  font-weight: var(--font-weight-semibold);
  color: var(--color-text-primary);
  margin-bottom: var(--space-2);
}

.empty-state-description {
  font-size: var(--font-size-base);
  color: var(--color-text-secondary);
  max-width: 400px;
  margin-bottom: var(--space-6);
}

/* ==========================================================================
   Loading States
   ========================================================================== */

.loading-spinner {
  width: 24px;
  height: 24px;
  border: 2px solid var(--color-border-default);
  border-top-color: var(--color-accent-primary);
  border-radius: var(--radius-full);
  animation: spin 0.8s linear infinite;
}

@keyframes spin {
  to { transform: rotate(360deg); }
}

.skeleton {
  background: linear-gradient(
    90deg,
    var(--color-bg-tertiary) 0%,
    var(--color-bg-hover) 50%,
    var(--color-bg-tertiary) 100%
  );
  background-size: 200% 100%;
  animation: skeleton-loading 1.5s ease-in-out infinite;
  border-radius: var(--radius-sm);
}

@keyframes skeleton-loading {
  0% { background-position: 200% 0; }
  100% { background-position: -200% 0; }
}

.skeleton-title {
  height: 24px;
  width: 60%;
  margin-bottom: var(--space-3);
}

.skeleton-text {
  height: 16px;
  width: 100%;
  margin-bottom: var(--space-2);
}

.skeleton-text:last-child {
  width: 80%;
}

/* AI Processing state */
.ai-processing {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: var(--space-8);
  text-align: center;
}

.ai-processing-animation {
  width: 48px;
  height: 48px;
  margin-bottom: var(--space-4);
}

.ai-dots {
  display: flex;
  gap: var(--space-2);
}

.ai-dot {
  width: 10px;
  height: 10px;
  background-color: var(--color-accent-primary);
  border-radius: var(--radius-full);
  animation: ai-pulse 1.4s ease-in-out infinite;
}

.ai-dot:nth-child(2) { animation-delay: 0.2s; }
.ai-dot:nth-child(3) { animation-delay: 0.4s; }

@keyframes ai-pulse {
  0%, 100% {
    transform: scale(1);
    opacity: 0.4;
  }
  50% {
    transform: scale(1.2);
    opacity: 1;
  }
}

.ai-processing-text {
  font-size: var(--font-size-sm);
  color: var(--color-text-secondary);
}

/* ==========================================================================
   Modals & Dialogs
   ========================================================================== */

.modal-overlay {
  position: fixed;
  inset: 0;
  background-color: rgba(0, 0, 0, 0.7);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 1000;
  opacity: 0;
  visibility: hidden;
  transition: all var(--transition-base);
}

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

.modal {
  background-color: var(--color-surface-modal);
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-xl);
  max-width: 480px;
  width: 90%;
  max-height: 90vh;
  overflow: hidden;
  transform: scale(0.95) translateY(20px);
  transition: transform var(--transition-base);
}

.modal-overlay.active .modal {
  transform: scale(1) translateY(0);
}

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

.modal-title {
  font-size: var(--font-size-lg);
  font-weight: var(--font-weight-semibold);
}

.modal-close {
  background: none;
  border: none;
  padding: var(--space-2);
  color: var(--color-text-tertiary);
  cursor: pointer;
  border-radius: var(--radius-sm);
  transition: all var(--transition-fast);
}

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

.modal-body {
  padding: var(--space-5);
  overflow-y: auto;
}

.modal-footer {
  padding: var(--space-4) var(--space-5);
  border-top: 1px solid var(--color-border-subtle);
  display: flex;
  justify-content: flex-end;
  gap: var(--space-3);
}

/* ==========================================================================
   Forms
   ========================================================================== */

.form-group {
  margin-bottom: var(--space-5);
}

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

.form-input {
  width: 100%;
  padding: var(--space-3) var(--space-4);
  background-color: var(--color-surface-input);
  border: 1px solid var(--color-border-default);
  border-radius: var(--radius-md);
  color: var(--color-text-primary);
  font-size: var(--font-size-base);
  transition: all var(--transition-fast);
}

.form-input:focus {
  outline: none;
  border-color: var(--color-accent-primary);
  box-shadow: 0 0 0 3px var(--color-accent-primary-muted);
}

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

.form-hint {
  font-size: var(--font-size-xs);
  color: var(--color-text-tertiary);
  margin-top: var(--space-1);
}

.form-error {
  font-size: var(--font-size-xs);
  color: var(--color-error);
  margin-top: var(--space-1);
}

/* ==========================================================================
   Tooltips
   ========================================================================== */

[data-tooltip] {
  position: relative;
}

[data-tooltip]::after {
  content: attr(data-tooltip);
  position: absolute;
  bottom: 100%;
  left: 50%;
  transform: translateX(-50%) translateY(-4px);
  padding: var(--space-1) var(--space-2);
  background-color: var(--color-bg-elevated);
  border: 1px solid var(--color-border-default);
  border-radius: var(--radius-sm);
  font-size: var(--font-size-xs);
  color: var(--color-text-primary);
  white-space: nowrap;
  opacity: 0;
  visibility: hidden;
  transition: all var(--transition-fast);
  z-index: 1000;
}

[data-tooltip]:hover::after {
  opacity: 1;
  visibility: visible;
  transform: translateX(-50%) translateY(-8px);
}

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

@media (max-width: 1024px) {
  :root {
    --ai-panel-width: 320px;
  }

  .editor-main {
    padding: var(--space-6);
  }

  .notes-grid {
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  }
}

@media (max-width: 768px) {
  :root {
    --sidebar-width: 100%;
    --header-height: 56px;
  }

  .sidebar {
    transform: translateX(-100%);
    width: 85%;
    max-width: 320px;
  }

  .sidebar.open {
    transform: translateX(0);
  }

  .sidebar-overlay {
    position: fixed;
    inset: 0;
    background-color: rgba(0, 0, 0, 0.5);
    z-index: 99;
    opacity: 0;
    visibility: hidden;
    transition: all var(--transition-base);
  }

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

  .main-content {
    margin-left: 0;
  }

  .menu-toggle {
    display: flex;
  }

  .header {
    padding: 0 var(--space-4);
  }

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

  .search-hint {
    display: none;
  }

  .content {
    padding: var(--space-4);
  }

  .content-header {
    flex-direction: column;
    align-items: flex-start;
    gap: var(--space-4);
  }

  .notes-grid {
    grid-template-columns: 1fr;
  }

  .editor-container {
    flex-direction: column;
  }

  .editor-main {
    padding: var(--space-4);
  }

  .editor-content {
    flex-direction: column;
  }

  .editor-pane {
    min-height: 300px;
  }

  .ai-panel {
    width: 100%;
    height: 60vh;
    top: auto;
    bottom: 0;
    transform: translateY(100%);
    border-left: none;
    border-top: 1px solid var(--color-border-subtle);
    border-radius: var(--radius-xl) var(--radius-xl) 0 0;
  }

  .ai-panel.open {
    transform: translateY(0);
  }

  .ai-toggle-btn {
    bottom: var(--space-4);
    right: var(--space-4);
    top: auto;
  }

  .fab {
    bottom: var(--space-4);
    right: var(--space-4);
    width: 48px;
    height: 48px;
  }

  .editor-actions {
    flex-direction: column;
    gap: var(--space-4);
  }

  .editor-actions-left,
  .editor-actions-right {
    width: 100%;
    justify-content: center;
  }

  .view-toggle {
    width: 100%;
  }

  .view-toggle-btn {
    flex: 1;
  }
}

@media (max-width: 480px) {
  .editor-title-input {
    font-size: var(--font-size-2xl);
  }

  .editor-toolbar {
    flex-wrap: wrap;
    justify-content: center;
  }

  .toolbar-divider {
    display: none;
  }

  .modal {
    width: 100%;
    max-width: none;
    margin: var(--space-4);
    max-height: calc(100vh - var(--space-8));
  }

  .tag-cloud {
    max-height: 100px;
    overflow-y: auto;
  }
}

/* ==========================================================================
   Utility Classes
   ========================================================================== */

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border-width: 0;
}

.flex { display: flex; }
.flex-col { flex-direction: column; }
.items-center { align-items: center; }
.justify-center { justify-content: center; }
.justify-between { justify-content: space-between; }
.gap-2 { gap: var(--space-2); }
.gap-4 { gap: var(--space-4); }
.gap-6 { gap: var(--space-6); }

.mt-2 { margin-top: var(--space-2); }
.mt-4 { margin-top: var(--space-4); }
.mt-6 { margin-top: var(--space-6); }
.mb-2 { margin-bottom: var(--space-2); }
.mb-4 { margin-bottom: var(--space-4); }
.mb-6 { margin-bottom: var(--space-6); }

.w-full { width: 100%; }
.h-full { height: 100%; }

.text-center { text-align: center; }
.text-right { text-align: right; }

.hidden { display: none; }
.visible { visibility: visible; }
.invisible { visibility: hidden; }

/* Focus visible for accessibility */
:focus-visible {
  outline: 2px solid var(--color-accent-primary);
  outline-offset: 2px;
}

/* Reduce motion for users who prefer it */
@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}