/* ==========================================================================
   CSS variables & Design Tokens
   ========================================================================== */
:root[data-theme="dark"] {
  --bg-primary: #141413;        /* Slate Dark - warm near-black canvas */
  --bg-secondary: #1c1c1a;      /* Elevated warm charcoal card surface */
  --bg-tertiary: #282825;       /* Deeper warm dark surface */
  --bg-panel: rgba(28, 28, 26, 0.8);
  --border-color: #3a3a37;      /* Warm dark borders */
  --border-glow: rgba(219, 119, 87, 0.25);
  
  --text-primary: #faf9f5;      /* Ivory Light - warm white body text */
  --text-secondary: #b0aea5;    /* Cloud Medium secondary text */
  --text-muted: #87867f;        /* Cloud Dark muted helper text */
  
  --accent: #e68a6c;            /* Terracotta Clay highlight (slightly brighter on dark) */
  --accent-secondary: #d97757;  /* Clay accent base */
  --accent-gradient: linear-gradient(135deg, #e68a6c 0%, #d97757 100%);
  --accent-glow: rgba(230, 138, 108, 0.25);
  
  --success: #3fb950;
  --success-bg: rgba(63, 185, 80, 0.12);
  --warning: #d29922;
  --warning-bg: rgba(210, 153, 34, 0.12);
  --danger: #f85149;
  --danger-bg: rgba(248, 81, 73, 0.12);
  --info: #58a6ff;
  --info-bg: rgba(88, 166, 255, 0.12);
  
  --shadow-sm: none;            /* No shadow in paper metaphor */
  --shadow-md: none;
  
  --monaco-theme: "vs-dark";
}

:root[data-theme="light"] {
  --bg-primary: #f0eee6;        /* Ivory Medium - warm parchment canvas */
  --bg-secondary: #faf9f5;      /* Ivory Light - card surface */
  --bg-tertiary: #e3dacc;       /* Oat Warm - deeper paper tone fill */
  --bg-panel: rgba(250, 249, 245, 0.85);
  --border-color: #cccbc8;      /* Stone borders */
  --border-glow: rgba(217, 119, 87, 0.15);
  
  --text-primary: #141413;      /* Slate Dark - near-black primary text */
  --text-secondary: #87867f;    /* Cloud Dark secondary text */
  --text-muted: #b0aea5;        /* Cloud Medium muted text */
  
  --accent: #d97757;            /* Clay primary filled CTA */
  --accent-secondary: #c6613f;  /* Clay Deep hover/active */
  --accent-gradient: linear-gradient(135deg, #d97757 0%, #c6613f 100%);
  --accent-glow: rgba(217, 119, 87, 0.20);
  
  --success: #1a7f37;
  --success-bg: rgba(46, 160, 67, 0.08);
  --warning: #9a6700;
  --warning-bg: rgba(187, 128, 9, 0.08);
  --danger: #cf222e;
  --danger-bg: rgba(248, 81, 73, 0.08);
  --info: #0969da;
  --info-bg: rgba(9, 105, 218, 0.08);
  
  --shadow-sm: none;            /* No shadow in paper metaphor */
  --shadow-md: none;
  
  --monaco-theme: "vs";
}

/* ==========================================================================
   Base Styles
   ========================================================================== */
* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

body {
  font-family: 'JetBrains Mono', ui-monospace, Menlo, Monaco, Consolas, monospace;
  font-size: 15px;
  line-height: 1.5;
  color: var(--text-primary);
  background-color: var(--bg-primary);
  height: 100vh;
  overflow: hidden;
  transition: background-color 0.3s ease, color 0.3s ease;
}

/* Custom Scrollbars */
::-webkit-scrollbar {
  width: 8px;
  height: 8px;
}
::-webkit-scrollbar-track {
  background: var(--bg-primary);
}
::-webkit-scrollbar-thumb {
  background: var(--border-color);
  border-radius: 4px;
}
::-webkit-scrollbar-thumb:hover {
  background: var(--text-muted);
}

/* ==========================================================================
   App Layout
   ========================================================================== */
.app-layout {
  display: flex;
  width: 100vw;
  height: 100vh;
  overflow: hidden;
}

/* ==========================================================================
   Sidebar (Left)
   ========================================================================== */
.sidebar {
  width: 280px;
  background-color: var(--bg-secondary);
  border-right: 1px solid var(--border-color);
  display: flex;
  flex-direction: column;
  flex-shrink: 0;
  transition: width 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  z-index: 10;
}

.sidebar.collapsed {
  width: 0;
  overflow: hidden;
  border-right: none;
}

.sidebar-header {
  padding: 20px;
  border-bottom: 1px solid var(--border-color);
}

.logo {
  display: flex;
  align-items: center;
  gap: 12px;
}

.logo-icon {
  width: 32px;
  height: 32px;
  color: var(--accent);
}

.logo h1 {
  font-family: 'JetBrains Mono', monospace;
  font-size: 1.15rem;
  font-weight: 700;
  letter-spacing: 0.5px;
  color: var(--text-primary);
}

.logo-subtitle {
  font-size: 0.75rem;
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 1px;
  color: var(--accent);
}

/* Search Box */
.search-box {
  padding: 16px;
  border-bottom: 1px solid var(--border-color);
}

.search-input-wrapper {
  position: relative;
  display: flex;
  align-items: center;
}

.search-icon {
  position: absolute;
  left: 12px;
  width: 16px;
  height: 16px;
  color: var(--text-secondary);
}

.search-box input {
  width: 100%;
  padding: 10px 36px 10px 36px;
  background-color: var(--bg-tertiary);
  border: 1px solid var(--border-color);
  border-radius: 8px;
  color: var(--text-primary);
  font-size: 0.9rem;
  transition: border-color 0.2s, box-shadow 0.2s;
}

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

.hidden-btn {
  display: none;
}

.search-input-wrapper .hidden-btn.visible {
  display: block;
  position: absolute;
  right: 12px;
  background: none;
  border: none;
  cursor: pointer;
}

.search-input-wrapper .hidden-btn i {
  width: 16px;
  height: 16px;
  color: var(--text-secondary);
}

/* Navigation List */
.chapters-nav {
  flex-grow: 1;
  overflow-y: auto;
  padding: 16px 8px;
}

.nav-title {
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  color: var(--text-muted);
  letter-spacing: 1px;
  padding-left: 12px;
  margin-bottom: 8px;
}

.chapters-nav ul {
  list-style: none;
}

.chapters-nav li {
  margin-bottom: 4px;
}

.chapters-nav a, .chapter-list-item {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 10px 12px;
  color: var(--text-secondary);
  text-decoration: none;
  font-size: 0.925rem;
  font-weight: 500;
  border-radius: 8px;
  cursor: pointer;
  transition: all 0.2s ease;
}

.chapters-nav a:hover, .chapter-list-item:hover {
  background-color: var(--bg-tertiary);
  color: var(--text-primary);
}

.chapters-nav li.active a, .chapter-list-item.active {
  background-color: var(--accent-glow);
  color: var(--accent);
  border-left: 3px solid var(--accent);
  font-weight: 600;
}

.chapter-number-badge {
  background-color: var(--bg-tertiary);
  color: var(--text-secondary);
  font-size: 0.7rem;
  font-weight: 700;
  padding: 2px 6px;
  border-radius: 4px;
}

.active .chapter-number-badge {
  background-color: var(--accent);
  color: white;
}

/* Skeleton items for loading list */
.skeleton-item {
  height: 38px;
  background: linear-gradient(90deg, var(--bg-tertiary) 25%, var(--bg-secondary) 50%, var(--bg-tertiary) 75%);
  background-size: 200% 100%;
  animation: loading 1.5s infinite;
  border-radius: 8px;
  margin-bottom: 8px;
}

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

/* Sidebar Footer */
.sidebar-footer {
  padding: 16px;
  border-top: 1px solid var(--border-color);
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.footer-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 10px;
  background-color: var(--bg-tertiary);
  border: 1px solid var(--border-color);
  border-radius: 8px;
  color: var(--text-secondary);
  font-size: 0.9rem;
  font-weight: 500;
  cursor: pointer;
  transition: background-color 0.2s, color 0.2s;
}

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

.sun-icon { display: none; }
.moon-icon { display: block; }
[data-theme="light"] .sun-icon { display: block; }
[data-theme="light"] .moon-icon { display: none; }

.status-indicator {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.75rem;
  color: var(--text-secondary);
}

.status-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
}

.status-dot.green {
  background-color: var(--success);
  box-shadow: 0 0 8px var(--success);
}

/* ==========================================================================
   Main Content Area
   ========================================================================== */
.main-content {
  flex-grow: 1;
  display: flex;
  flex-direction: column;
  height: 100%;
  overflow: hidden;
  background-color: var(--bg-primary);
}

/* Header */
.app-header {
  height: 70px;
  background-color: var(--bg-secondary);
  border-bottom: 1px solid var(--border-color);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 24px;
  flex-shrink: 0;
}

.header-left {
  display: flex;
  align-items: center;
  gap: 16px;
}

.header-icon-btn {
  background: none;
  border: none;
  cursor: pointer;
  color: var(--text-secondary);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 8px;
  border-radius: 6px;
  transition: background-color 0.2s;
}

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

.title-wrapper {
  display: flex;
  flex-direction: column;
}

.category-badge {
  font-size: 0.7rem;
  font-weight: 700;
  text-transform: uppercase;
  color: var(--accent);
  letter-spacing: 1px;
}

#current-title {
  font-family: 'JetBrains Mono', monospace;
  font-size: 1.15rem;
  font-weight: 600;
  color: var(--text-primary);
}

/* Mode Selector (Read/Edit/Split) */
.header-right {
  display: flex;
  align-items: center;
  gap: 20px;
}

.mode-selector {
  display: flex;
  background-color: var(--bg-tertiary);
  padding: 4px;
  border-radius: 8px;
  border: 1px solid var(--border-color);
}

.mode-btn {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 6px 12px;
  background: none;
  border: none;
  border-radius: 6px;
  font-family: inherit;
  font-size: 0.85rem;
  font-weight: 500;
  color: var(--text-secondary);
  cursor: pointer;
  transition: all 0.2s;
}

.mode-btn:hover {
  color: var(--text-primary);
}

.mode-btn.active {
  background-color: var(--bg-secondary);
  color: var(--accent);
  box-shadow: var(--shadow-sm);
}

/* Actions */
.action-buttons {
  display: flex;
  align-items: center;
  gap: 16px;
}

.autosave-wrapper {
  display: flex;
  align-items: center;
  gap: 8px;
  user-select: none;
}

.autosave-text {
  font-size: 0.8rem;
  color: var(--text-secondary);
}

/* Switch styling */
.switch-label {
  position: relative;
  display: inline-block;
  width: 36px;
  height: 20px;
}

.switch-label input {
  opacity: 0;
  width: 0;
  height: 0;
}

.switch-slider {
  position: absolute;
  cursor: pointer;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background-color: var(--bg-tertiary);
  border: 1px solid var(--border-color);
  transition: .3s;
  border-radius: 20px;
}

.switch-slider:before {
  position: absolute;
  content: "";
  height: 14px;
  width: 14px;
  left: 2px;
  bottom: 2px;
  background-color: var(--text-secondary);
  transition: .3s;
  border-radius: 50%;
}

.switch-label input:checked + .switch-slider {
  background-color: var(--success);
}

.switch-label input:checked + .switch-slider:before {
  transform: translateX(16px);
  background-color: white;
}

/* Primary Button */
.primary-btn {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 8px 16px;
  background: var(--accent-gradient);
  border: none;
  border-radius: 8px;
  color: white;
  font-family: inherit;
  font-size: 0.9rem;
  font-weight: 600;
  cursor: pointer;
  transition: opacity 0.2s, transform 0.2s;
  box-shadow: 0 4px 10px var(--accent-glow);
}

.primary-btn:hover {
  opacity: 0.9;
  transform: translateY(-1px);
}

.primary-btn.disabled {
  background: var(--bg-tertiary);
  color: var(--text-muted);
  box-shadow: none;
  cursor: not-allowed;
  transform: none;
  opacity: 0.6;
}

/* ==========================================================================
   Workspace Layout
   ========================================================================== */
.workspace-panels {
  flex-grow: 1;
  display: flex;
  overflow: hidden;
  position: relative;
}

.workspace-panel {
  display: none;
  height: 100%;
  overflow-y: auto;
}

.workspace-panel.active-panel {
  display: block;
}

/* Split screen config */
.split-mode #reader-panel,
.split-mode #editor-panel {
  display: block;
  width: 50%;
}

.split-mode #reader-panel {
  border-left: 1px solid var(--border-color);
  order: 2; /* Editor on left, reader on right */
}

/* Welcome Screen styling */
.welcome-screen {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
  height: calc(100vh - 200px);
  max-width: 500px;
  margin: 0 auto;
  padding: 20px;
}

.welcome-icon {
  width: 64px;
  height: 64px;
  color: var(--accent);
  margin-bottom: 24px;
  animation: pulse 2s infinite;
}

@keyframes pulse {
  0% { transform: scale(1); opacity: 0.8; }
  50% { transform: scale(1.05); opacity: 1; }
  100% { transform: scale(1); opacity: 0.8; }
}

.welcome-screen h2 {
  font-family: 'JetBrains Mono', monospace;
  font-size: 1.5rem;
  margin-bottom: 12px;
  color: var(--text-primary);
}

.welcome-screen p {
  color: var(--text-secondary);
  font-size: 0.95rem;
  line-height: 1.6;
}

/* ==========================================================================
   Markdown Reader Panel
   ========================================================================== */
#reader-panel {
  background-color: var(--bg-primary);
}

.markdown-body {
  max-width: 820px;
  margin: 0 auto;
  padding: 40px 48px;
  font-family: 'JetBrains Mono', ui-monospace, Menlo, Monaco, Consolas, monospace;
  font-size: 17px;
  line-height: 1.55;
  color: var(--text-primary);
}

/* Markdown styling inside panels */
.markdown-body h1, 
.markdown-body h2, 
.markdown-body h3, 
.markdown-body h4 {
  font-family: 'JetBrains Mono', ui-monospace, Menlo, Monaco, Consolas, monospace;
  color: var(--text-primary);
  margin-top: 1.8em;
  margin-bottom: 0.6em;
  font-weight: 700;
}

.markdown-body h1 {
  font-size: 2.25rem;
  border-bottom: 1px solid var(--border-color);
  padding-bottom: 0.3em;
  margin-top: 0;
}

.markdown-body h2 {
  font-size: 1.65rem;
  border-bottom: 1px solid var(--border-color);
  padding-bottom: 0.3em;
}

.markdown-body h3 {
  font-size: 1.3rem;
}

.markdown-body p {
  margin-bottom: 1.2em;
}

.markdown-body ul, 
.markdown-body ol {
  margin-bottom: 1.2em;
  padding-left: 2em;
}

.markdown-body li {
  margin-bottom: 0.4em;
}

/* Tables */
.markdown-body table {
  width: 100%;
  border-collapse: collapse;
  margin-bottom: 1.5em;
  font-size: 0.95rem;
}

.markdown-body th, 
.markdown-body td {
  padding: 12px 16px;
  border: 1px solid var(--border-color);
}

.markdown-body th {
  background-color: var(--bg-secondary);
  font-weight: 600;
  text-align: left;
}

.markdown-body tr:nth-child(even) td {
  background-color: rgba(255, 255, 255, 0.02);
}

/* Code Syntax & Blocks */
.markdown-body code {
  font-family: ui-monospace, SFMono-Regular, SF Mono, Menlo, Consolas, Liberation Mono, monospace;
  font-size: 0.85em;
  background-color: var(--bg-secondary);
  padding: 3px 6px;
  border-radius: 6px;
  border: 1px solid var(--border-color);
}

.markdown-body pre {
  margin-bottom: 1.5em;
  padding: 16px;
  overflow: auto;
  font-size: 0.9em;
  line-height: 1.45;
  background-color: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: 12px;
}

.markdown-body pre code {
  background-color: transparent;
  padding: 0;
  border: none;
  font-size: inherit;
}

/* GitHub style blockquotes & alerts */
.markdown-body blockquote {
  padding: 0 1em;
  color: var(--text-secondary);
  border-left: 0.25em solid var(--border-color);
  margin-bottom: 1.2em;
}

/* Specially rendered alerts */
.markdown-alert {
  padding: 12px 16px;
  margin-bottom: 16px;
  border-left: 4px solid var(--accent);
  border-radius: 0 8px 8px 0;
}

.markdown-alert-title {
  font-weight: 600;
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.9rem;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  margin-bottom: 4px;
}

.markdown-alert.markdown-alert-note {
  border-color: var(--info);
  background-color: var(--info-bg);
}
.markdown-alert.markdown-alert-note .markdown-alert-title {
  color: var(--info);
}

.markdown-alert.markdown-alert-tip {
  border-color: var(--success);
  background-color: var(--success-bg);
}
.markdown-alert.markdown-alert-tip .markdown-alert-title {
  color: var(--success);
}

.markdown-alert.markdown-alert-warning {
  border-color: var(--warning);
  background-color: var(--warning-bg);
}
.markdown-alert.markdown-alert-warning .markdown-alert-title {
  color: var(--warning);
}

.markdown-alert.markdown-alert-caution {
  border-color: var(--danger);
  background-color: var(--danger-bg);
}
.markdown-alert.markdown-alert-caution .markdown-alert-title {
  color: var(--danger);
}

.markdown-body img {
  max-width: 100%;
  border-radius: 8px;
  margin: 1.5em 0;
}

.markdown-body hr {
  height: 1px;
  background-color: var(--border-color);
  border: none;
  margin: 2em 0;
}

/* Wiki links style */
.markdown-body a.wiki-link {
  color: var(--accent);
  text-decoration: none;
  font-weight: 600;
  border-bottom: 1px dashed var(--accent);
  transition: all 0.2s;
}

.markdown-body a.wiki-link:hover {
  border-bottom-style: solid;
  background-color: var(--accent-glow);
}

/* ==========================================================================
   Monaco Editor Panel
   ========================================================================== */
#editor-panel {
  background-color: var(--bg-tertiary);
  flex-grow: 1;
}

#monaco-container {
  width: 100%;
  height: 100%;
}

/* ==========================================================================
   Outline (Right Sidebar)
   ========================================================================== */
.outline-sidebar {
  width: 250px;
  background-color: var(--bg-secondary);
  border-left: 1px solid var(--border-color);
  display: flex;
  flex-direction: column;
  flex-shrink: 0;
}

.outline-header {
  padding: 20px;
  border-bottom: 1px solid var(--border-color);
  display: flex;
  align-items: center;
  gap: 10px;
  color: var(--text-primary);
}

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

.outline-header h3 {
  font-size: 0.95rem;
  font-weight: 600;
}

.outline-content {
  flex-grow: 1;
  overflow-y: auto;
  padding: 16px;
}

#outline-list {
  list-style: none;
}

#outline-list li {
  margin-bottom: 2px;
}

#outline-list a {
  display: block;
  padding: 6px 8px;
  color: var(--text-secondary);
  text-decoration: none;
  font-size: 0.825rem;
  border-radius: 6px;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  cursor: pointer;
  transition: all 0.2s;
}

#outline-list a:hover {
  background-color: var(--bg-tertiary);
  color: var(--text-primary);
  padding-left: 12px;
}

#outline-list a.active-outline {
  background-color: var(--border-color);
  color: var(--accent);
  font-weight: 600;
}

/* Heading indentation inside Outline */
#outline-list a.outline-h2 {
  padding-left: 8px;
}
#outline-list a.outline-h3 {
  padding-left: 18px;
  font-size: 0.775rem;
}
#outline-list a.outline-h4 {
  padding-left: 28px;
  font-size: 0.75rem;
  opacity: 0.8;
}

.empty-outline {
  font-size: 0.8rem;
  color: var(--text-muted);
  text-align: center;
  padding: 20px 0;
}

/* ==========================================================================
   Global Search Results Panel
   ========================================================================== */
#search-results-panel {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background-color: var(--bg-primary);
  z-index: 100;
  display: flex;
  flex-direction: column;
  animation: slideIn 0.2s ease-out;
}

#search-results-panel.hidden {
  display: none;
}

@keyframes slideIn {
  0% { transform: translateY(10px); opacity: 0; }
  100% { transform: translateY(0); opacity: 1; }
}

.search-results-header {
  height: 70px;
  padding: 0 24px;
  border-bottom: 1px solid var(--border-color);
  display: flex;
  align-items: center;
  justify-content: space-between;
  background-color: var(--bg-secondary);
}

.search-results-header h3 {
  font-family: 'JetBrains Mono', monospace;
  font-size: 1.1rem;
}

.close-btn {
  background: none;
  border: none;
  cursor: pointer;
  color: var(--text-secondary);
  display: flex;
  align-items: center;
  padding: 8px;
  border-radius: 6px;
}

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

.search-results-list {
  flex-grow: 1;
  overflow-y: auto;
  padding: 24px 40px;
  max-width: 820px;
  margin: 0 auto;
  width: 100%;
}

.search-result-item {
  margin-bottom: 24px;
  padding: 20px;
  background-color: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: 12px;
  cursor: pointer;
  transition: all 0.2s ease;
}

.search-result-item:hover {
  transform: translateY(-2px);
  border-color: var(--accent);
  box-shadow: 0 6px 15px var(--accent-glow);
}

.result-title {
  font-family: 'Outfit', sans-serif;
  font-size: 1.1rem;
  font-weight: 600;
  color: var(--accent);
  margin-bottom: 8px;
}

.result-snippet {
  font-size: 0.925rem;
  color: var(--text-secondary);
  line-height: 1.6;
}

.result-snippet mark {
  background-color: rgba(210, 153, 34, 0.3);
  color: var(--warning);
  font-weight: 600;
  padding: 1px 4px;
  border-radius: 4px;
}

.no-results {
  text-align: center;
  padding: 40px 0;
  color: var(--text-muted);
}

/* ==========================================================================
   Toasts Container
   ========================================================================== */
.toast-container {
  position: fixed;
  bottom: 24px;
  right: 24px;
  display: flex;
  flex-direction: column;
  gap: 10px;
  z-index: 9999;
}

.toast {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 12px 20px;
  background-color: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: 8px;
  box-shadow: var(--shadow-md);
  color: var(--text-primary);
  font-size: 0.9rem;
  font-weight: 500;
  min-width: 250px;
  max-width: 400px;
  animation: toastIn 0.3s cubic-bezier(0.18, 0.89, 0.32, 1.28) forwards;
}

@keyframes toastIn {
  0% { transform: translateY(20px) scale(0.9); opacity: 0; }
  100% { transform: translateY(0) scale(1); opacity: 1; }
}

.toast.toast-out {
  animation: toastOut 0.3s ease forwards;
}

@keyframes toastOut {
  0% { transform: translateY(0) opacity: 1; }
  100% { transform: translateY(-20px) opacity: 0; }
}

.toast-icon {
  width: 18px;
  height: 18px;
  flex-shrink: 0;
}

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

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

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

/* ==========================================================================
   Mobile Responsive Adjustments
   ========================================================================== */
@media (max-width: 768px) {
  /* Layout adjustments */
  .app-layout {
    flex-direction: column;
    position: relative;
    height: 100vh;
  }
  
  /* Sidebar as overlay drawer */
  .sidebar {
    position: absolute;
    top: 0;
    left: 0;
    width: 280px;
    height: 100%;
    z-index: 1000;
    box-shadow: 4px 0 15px rgba(0, 0, 0, 0.5);
    transform: translateX(-100%);
    transition: transform 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  }
  
  .sidebar.active {
    transform: translateX(0);
  }
  
  /* Collapsed state is standard closed state on mobile */
  .sidebar.collapsed {
    width: 280px;
    transform: translateX(-100%);
    border-right: none;
  }
  
  /* Outline sidebar is hidden on mobile */
  .outline-sidebar {
    display: none !important;
  }
  
  /* Main content takes full screen width */
  .main-content {
    width: 100%;
    height: 100%;
    overflow: hidden;
  }
  
  /* Header adjustments */
  .app-header {
    padding: 0 12px;
    height: 60px;
  }
  
  .title-wrapper {
    max-width: 160px;
  }
  
  #current-title {
    font-size: 0.95rem;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
  }
  
  /* Compact Mode selector and buttons on mobile */
  .mode-selector span {
    display: none; /* Hide button text, show only icons for compact layout */
  }
  
  .mode-btn {
    padding: 8px 12px;
  }
  
  .action-buttons {
    gap: 8px;
  }
  
  .autosave-wrapper {
    display: none; /* Hide autosave toggle on mobile to save space */
  }
  
  .primary-btn span {
    display: none; /* Hide text on save button */
  }
  
  .primary-btn {
    padding: 8px 12px;
  }
  
  /* Markdown content spacing and sizing */
  .markdown-body {
    padding: 24px 16px;
    font-size: 1rem;
    line-height: 1.6;
  }
  
  .markdown-body h1 {
    font-size: 1.65rem;
  }
  .markdown-body h2 {
    font-size: 1.35rem;
    padding-bottom: 0.2em;
  }
  .markdown-body h3 {
    font-size: 1.15rem;
  }
  
  /* Disable split screen editor on mobile */
  .split-mode #reader-panel {
    width: 100% !important;
  }
  
  .split-mode #editor-panel {
    display: none !important;
  }
  
  /* Global search results panel spacing */
  .search-results-list {
    padding: 16px;
  }
  
  .search-result-item {
    padding: 14px;
    margin-bottom: 16px;
  }
}