/* Reset & Variables */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

/* Default Theme: Midnight */
:root,
[data-theme="midnight"] {
  --bg-primary: #0d1117;
  --bg-secondary: #161b22;
  --bg-tertiary: #21262d;
  --border-color: #30363d;
  --text-primary: #e6edf3;
  --text-secondary: #8b949e;
  --accent: #58a6ff;
  --accent-hover: #79b8ff;
  --success: #3fb950;
}

/* Daylight */
[data-theme="daylight"] {
  --bg-primary: #ffffff;
  --bg-secondary: #f6f8fa;
  --bg-tertiary: #eaeef2;
  --border-color: #d0d7de;
  --text-primary: #1f2328;
  --text-secondary: #656d76;
  --accent: #0969da;
  --accent-hover: #0550ae;
  --success: #1a7f37;
}

/* Dracula */
[data-theme="dracula"] {
  --bg-primary: #282a36;
  --bg-secondary: #1e1f29;
  --bg-tertiary: #44475a;
  --border-color: #6272a4;
  --text-primary: #f8f8f2;
  --text-secondary: #6272a4;
  --accent: #bd93f9;
  --accent-hover: #ff79c6;
  --success: #50fa7b;
}

/* Nord */
[data-theme="nord"] {
  --bg-primary: #2e3440;
  --bg-secondary: #3b4252;
  --bg-tertiary: #434c5e;
  --border-color: #4c566a;
  --text-primary: #eceff4;
  --text-secondary: #d8dee9;
  --accent: #88c0d0;
  --accent-hover: #81a1c1;
  --success: #a3be8c;
}

/* Monokai */
[data-theme="monokai"] {
  --bg-primary: #272822;
  --bg-secondary: #1e1f1c;
  --bg-tertiary: #3e3d32;
  --border-color: #49483e;
  --text-primary: #f8f8f2;
  --text-secondary: #75715e;
  --accent: #66d9ef;
  --accent-hover: #a6e22e;
  --success: #a6e22e;
}

/* Solarized Dark */
[data-theme="solarized-dark"] {
  --bg-primary: #002b36;
  --bg-secondary: #073642;
  --bg-tertiary: #094652;
  --border-color: #586e75;
  --text-primary: #839496;
  --text-secondary: #657b83;
  --accent: #268bd2;
  --accent-hover: #2aa198;
  --success: #859900;
}

/* Solarized Light */
[data-theme="solarized-light"] {
  --bg-primary: #fdf6e3;
  --bg-secondary: #eee8d5;
  --bg-tertiary: #e4ddc8;
  --border-color: #93a1a1;
  --text-primary: #657b83;
  --text-secondary: #93a1a1;
  --accent: #268bd2;
  --accent-hover: #2aa198;
  --success: #859900;
}

/* One Dark */
[data-theme="one-dark"] {
  --bg-primary: #282c34;
  --bg-secondary: #21252b;
  --bg-tertiary: #2c313a;
  --border-color: #3e4451;
  --text-primary: #abb2bf;
  --text-secondary: #5c6370;
  --accent: #61afef;
  --accent-hover: #c678dd;
  --success: #98c379;
}

/* Font Variables */
:root {
  --font-mono: 'SF Mono', 'Fira Code', 'Consolas', monospace;
  --font-sans: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Noto Sans', Helvetica, Arial, sans-serif;
}

/* Monospace Fonts */
[data-font-mono="system"] { --font-mono: 'SF Mono', 'Fira Code', 'Consolas', monospace; }
[data-font-mono="jetbrains"] { --font-mono: 'JetBrains Mono', monospace; }
[data-font-mono="fira"] { --font-mono: 'Fira Code', monospace; }
[data-font-mono="source-code"] { --font-mono: 'Source Code Pro', monospace; }
[data-font-mono="ibm-mono"] { --font-mono: 'IBM Plex Mono', monospace; }

/* Sans-serif Fonts */
[data-font-sans="system"] { --font-sans: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Noto Sans', Helvetica, Arial, sans-serif; }
[data-font-sans="inter"] { --font-sans: 'Inter', sans-serif; }
[data-font-sans="open-sans"] { --font-sans: 'Open Sans', sans-serif; }
[data-font-sans="nunito"] { --font-sans: 'Nunito', sans-serif; }
[data-font-sans="ibm-sans"] { --font-sans: 'IBM Plex Sans', sans-serif; }

/* Base */
body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Noto Sans', Helvetica, Arial, sans-serif;
  background: var(--bg-primary);
  color: var(--text-primary);
  height: 100vh;
  overflow: hidden;
}

/* Layout */
.container {
  display: flex;
  flex-direction: column;
  height: 100vh;
}

/* Header */
header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 12px 20px;
  background: var(--bg-secondary);
  border-bottom: 1px solid var(--border-color);
  flex-shrink: 0;
}

.logo-wrapper {
  display: flex;
  align-items: center;
  gap: 8px;
}

.logo {
  font-size: 1.25rem;
  font-weight: 600;
  color: var(--text-primary);
}

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

.help-icon {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 20px;
  height: 20px;
  color: var(--text-secondary);
  opacity: 0.7;
  transition: all 0.15s ease;
}

.help-icon:hover {
  color: var(--accent);
  opacity: 1;
}

.header-actions {
  display: flex;
  gap: 8px;
  align-items: center;
}

/* Buttons */
.btn {
  padding: 6px 14px;
  border-radius: 6px;
  border: 1px solid var(--border-color);
  background: var(--bg-tertiary);
  color: var(--text-primary);
  font-size: 0.875rem;
  cursor: pointer;
  transition: all 0.15s ease;
  display: flex;
  align-items: center;
  gap: 6px;
}

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

.btn-primary {
  background: var(--accent);
  border-color: var(--accent);
  color: #fff;
}

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

/* Dropdown */
.dropdown {
  position: relative;
}

.dropdown-menu {
  position: absolute;
  top: 100%;
  right: 0;
  margin-top: 4px;
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: 8px;
  padding: 4px;
  min-width: 150px;
  opacity: 0;
  visibility: hidden;
  transform: translateY(-8px);
  transition: all 0.15s ease;
  z-index: 100;
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.4);
}

.dropdown.open .dropdown-menu {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.dropdown-item {
  display: flex;
  align-items: center;
  gap: 8px;
  width: 100%;
  padding: 8px 12px;
  border: none;
  background: transparent;
  color: var(--text-primary);
  font-size: 0.875rem;
  cursor: pointer;
  border-radius: 4px;
  text-align: left;
}

.dropdown-item:hover {
  background: var(--bg-tertiary);
}

.dropdown-item svg {
  color: var(--text-secondary);
}

/* Theme Picker */
.theme-menu {
  min-width: 180px;
  background: #1e1e1e !important;
}

.theme-item {
  display: flex;
  align-items: center;
  gap: 10px;
  color: #e0e0e0 !important;
}

.theme-item:hover {
  background: #333 !important;
}

.theme-item.active {
  color: #58a6ff !important;
}

.theme-item.active::after {
  content: '✓';
  margin-left: auto;
  color: #58a6ff;
}

.theme-preview {
  width: 16px;
  height: 16px;
  border-radius: 50%;
  border: 2px solid;
  flex-shrink: 0;
}

/* Font Picker */
.font-menu {
  min-width: 180px;
  background: #1e1e1e !important;
  max-height: 400px;
  overflow-y: auto;
}

.font-section-label {
  padding: 8px 12px 4px;
  font-size: 11px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  color: #888 !important;
  border-top: 1px solid #333;
}

.font-section-label:first-child {
  border-top: none;
}

.font-item {
  color: #e0e0e0 !important;
}

.font-item:hover {
  background: #333 !important;
}

.font-item.active {
  color: #58a6ff !important;
}

.font-item.active::after {
  content: '✓';
  margin-left: auto;
  color: #58a6ff;
}

/* Main Content */
.main {
  display: flex;
  flex: 1;
  overflow: hidden;
}

.editor-pane,
.preview-pane {
  flex: 1;
  overflow: hidden;
  display: flex;
  flex-direction: column;
}

.editor-pane {
  border-right: 1px solid var(--border-color);
}

.pane-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 10px 16px;
  background: var(--bg-secondary);
  border-bottom: 1px solid var(--border-color);
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  color: var(--text-secondary);
  flex-shrink: 0;
}

.pane-header-title {
  flex-shrink: 0;
}

/* Pane Font Selector */
.pane-font-selector {
  position: relative;
}

.pane-font-btn {
  display: flex;
  align-items: center;
  gap: 4px;
  padding: 4px 8px;
  background: var(--bg-tertiary);
  border: 1px solid var(--border-color);
  border-radius: 4px;
  color: var(--text-secondary);
  font-size: 0.7rem;
  font-weight: 500;
  text-transform: none;
  letter-spacing: normal;
  cursor: pointer;
  transition: all 0.15s ease;
}

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

.pane-font-btn svg {
  width: 12px;
  height: 12px;
}

.pane-font-dropdown {
  position: absolute;
  top: 100%;
  right: 0;
  margin-top: 4px;
  min-width: 160px;
  background: #1e1e1e !important;
  border: 1px solid var(--border-color);
  border-radius: 6px;
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.4);
  z-index: 1000;
  opacity: 0;
  visibility: hidden;
  transform: translateY(-8px);
  transition: all 0.15s ease;
}

.pane-font-dropdown.open {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.pane-font-item {
  display: block;
  width: 100%;
  padding: 8px 12px;
  background: transparent;
  border: none;
  color: #e0e0e0 !important;
  font-size: 0.8rem;
  text-align: left;
  cursor: pointer;
  transition: background 0.1s ease;
}

.pane-font-item:hover {
  background: rgba(255, 255, 255, 0.1);
}

.pane-font-item.active {
  color: var(--accent) !important;
  background: rgba(88, 166, 255, 0.1);
}

/* Editor */
#editor {
  flex: 1;
  width: 100%;
  padding: 20px;
  padding-bottom: calc(20px + 5lh);
  background: var(--bg-primary);
  color: var(--text-primary);
  border: none;
  outline: none;
  resize: none;
  overflow-y: auto;
  font-family: var(--font-mono);
  font-size: 14px;
  line-height: 1.6;
}

#editor::placeholder {
  color: var(--text-secondary);
}

/* Preview */
#preview {
  flex: 1;
  overflow-y: auto;
  padding: 20px;
  padding-bottom: calc(20px + 5lh);
  background: var(--bg-primary);
}

/* Markdown Body Overrides (Dark Theme) */
.markdown-body {
  background: transparent !important;
  color: var(--text-primary) !important;
  font-family: var(--font-sans) !important;
}

.markdown-body h1,
.markdown-body h2,
.markdown-body h3,
.markdown-body h4,
.markdown-body h5,
.markdown-body h6 {
  color: var(--text-primary) !important;
  border-bottom-color: var(--border-color) !important;
}

.markdown-body blockquote {
  border-left-color: var(--border-color) !important;
  color: var(--text-secondary) !important;
}

.markdown-body table tr {
  background: var(--bg-primary) !important;
  border-top-color: var(--border-color) !important;
}

.markdown-body table tr:nth-child(2n) {
  background: var(--bg-secondary) !important;
}

.markdown-body table th,
.markdown-body table td {
  border-color: var(--border-color) !important;
}

.markdown-body hr {
  background: var(--border-color) !important;
}

.markdown-body a {
  color: var(--accent) !important;
}

/* Images */
.markdown-body img {
  max-width: 100%;
  border-radius: 8px;
  border: 1px solid var(--border-color);
  margin: 16px 0;
}

/* Code Blocks with Syntax Highlighting */
.markdown-body pre {
  position: relative;
  background: var(--bg-secondary) !important;
  border: 1px solid var(--border-color) !important;
  border-radius: 8px !important;
  padding: 0 !important;
  overflow: hidden;
}

/* Copy button for code blocks */
.code-copy-btn {
  position: absolute;
  top: 8px;
  right: 8px;
  padding: 4px 8px;
  background: var(--bg-tertiary);
  border: 1px solid var(--border-color);
  border-radius: 4px;
  color: var(--text-secondary);
  font-size: 12px;
  cursor: pointer;
  opacity: 0;
  transition: opacity 0.15s ease, background 0.15s ease;
  z-index: 1;
}

.markdown-body pre:hover .code-copy-btn {
  opacity: 1;
}

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

.code-copy-btn.copied {
  color: var(--success);
}

.markdown-body pre code {
  display: block;
  padding: 12px 16px !important;
  padding-left: 0 !important;
  overflow-x: auto;
  background: transparent !important;
  font-size: 13px;
  line-height: 1.5;
  counter-reset: line;
}

/* Line numbers */
.code-line {
  display: block;
}

.line-number {
  display: inline-block;
  width: 3em;
  padding-right: 1em;
  text-align: right;
  color: var(--text-secondary);
  user-select: none;
  opacity: 0.5;
}

.line-content {
  display: inline;
}

/* Inline Code */
.markdown-body code {
  background: var(--bg-tertiary) !important;
  color: var(--text-primary) !important;
  padding: 2px 6px;
  border-radius: 4px;
  font-size: 0.9em;
}

/* Reset padding for code inside pre */
.markdown-body pre code {
  padding: 16px !important;
}

/* Obsidian-style Callouts */
.callout {
  padding: 12px 16px;
  margin: 16px 0;
  border-radius: 8px;
  border-left: 4px solid;
  background: var(--bg-secondary);
}

.callout-title {
  display: flex;
  align-items: center;
  gap: 8px;
  font-weight: 600;
  margin-bottom: 8px;
}

.callout-title svg {
  width: 18px;
  height: 18px;
  flex-shrink: 0;
}

.callout-content p:last-child {
  margin-bottom: 0;
}

/* Note Callout */
.callout-note {
  border-left-color: #58a6ff;
  background: rgba(88, 166, 255, 0.1);
}

.callout-note .callout-title {
  color: #58a6ff;
}

/* Tip Callout */
.callout-tip {
  border-left-color: #3fb950;
  background: rgba(63, 185, 80, 0.1);
}

.callout-tip .callout-title {
  color: #3fb950;
}

/* Warning Callout */
.callout-warning {
  border-left-color: #d29922;
  background: rgba(210, 153, 34, 0.1);
}

.callout-warning .callout-title {
  color: #d29922;
}

/* Danger/Error Callout */
.callout-danger,
.callout-error {
  border-left-color: #f85149;
  background: rgba(248, 81, 73, 0.1);
}

.callout-danger .callout-title,
.callout-error .callout-title {
  color: #f85149;
}

/* Info Callout */
.callout-info {
  border-left-color: #58a6ff;
  background: rgba(88, 166, 255, 0.1);
}

.callout-info .callout-title {
  color: #58a6ff;
}

/* Important Callout */
.callout-important {
  border-left-color: #a371f7;
  background: rgba(163, 113, 247, 0.1);
}

.callout-important .callout-title {
  color: #a371f7;
}

/* Example Callout */
.callout-example {
  border-left-color: #a371f7;
  background: rgba(163, 113, 247, 0.1);
}

.callout-example .callout-title {
  color: #a371f7;
}

/* Quote Callout */
.callout-quote {
  border-left-color: var(--text-secondary);
  background: rgba(139, 148, 158, 0.1);
}

.callout-quote .callout-title {
  color: var(--text-secondary);
}

/* Abstract Callout */
.callout-abstract {
  border-left-color: #58a6ff;
  background: rgba(88, 166, 255, 0.1);
}

.callout-abstract .callout-title {
  color: #58a6ff;
}

/* Success Callout */
.callout-success {
  border-left-color: #3fb950;
  background: rgba(63, 185, 80, 0.1);
}

.callout-success .callout-title {
  color: #3fb950;
}

/* Question Callout */
.callout-question {
  border-left-color: #d29922;
  background: rgba(210, 153, 34, 0.1);
}

.callout-question .callout-title {
  color: #d29922;
}

/* Failure Callout */
.callout-failure {
  border-left-color: #f85149;
  background: rgba(248, 81, 73, 0.1);
}

.callout-failure .callout-title {
  color: #f85149;
}

/* Bug Callout */
.callout-bug {
  border-left-color: #f85149;
  background: rgba(248, 81, 73, 0.1);
}

.callout-bug .callout-title {
  color: #f85149;
}

/* Mermaid Diagrams */
.mermaid {
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: 8px;
  padding: 16px;
  margin: 16px 0;
  text-align: center;
}

.mermaid svg {
  max-width: 100%;
  height: auto;
}

.mermaid-error {
  color: #f85149;
  padding: 12px;
  background: rgba(248, 81, 73, 0.1);
  border-radius: 4px;
  font-family: monospace;
  font-size: 13px;
}

/* Content Tabs */
.content-tabs {
  margin: 16px 0;
  border: 1px solid var(--border-color);
  border-radius: 8px;
  overflow: hidden;
}

.tab-headers {
  display: flex;
  background: var(--bg-secondary);
  border-bottom: 1px solid var(--border-color);
}

.tab-btn {
  padding: 10px 16px;
  border: none;
  background: transparent;
  color: var(--text-secondary);
  font-size: 14px;
  cursor: pointer;
  border-bottom: 2px solid transparent;
  margin-bottom: -1px;
  transition: all 0.15s ease;
}

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

.tab-btn.active {
  color: var(--accent);
  border-bottom-color: var(--accent);
  background: var(--bg-primary);
}

.tab-panels {
  background: var(--bg-primary);
}

.tab-content {
  display: none;
  padding: 16px;
}

.tab-content.active {
  display: block;
}

/* Keyboard Keys */
kbd {
  display: inline-block;
  padding: 3px 8px;
  font-size: 12px;
  font-family: var(--font-mono);
  line-height: 1.4;
  color: var(--text-primary);
  background: var(--bg-tertiary);
  border: 1px solid var(--border-color);
  border-radius: 4px;
  box-shadow: inset 0 -1px 0 var(--border-color);
}

/* Highlight/Mark */
mark {
  background: rgba(210, 153, 34, 0.3);
  color: var(--text-primary);
  padding: 2px 4px;
  border-radius: 2px;
}

/* Better Task Lists */
.markdown-body .task-list-item {
  list-style-type: none;
}

.markdown-body .task-list-item input[type="checkbox"] {
  margin-right: 8px;
  accent-color: var(--accent);
}

/* Toast Notifications */
.toast {
  position: fixed;
  bottom: 20px;
  right: 20px;
  padding: 12px 20px;
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: 8px;
  color: var(--text-primary);
  font-size: 0.875rem;
  transform: translateY(100px);
  opacity: 0;
  transition: all 0.3s ease;
  z-index: 1000;
}

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

.toast.success {
  border-color: var(--success);
}

/* Viewer Badge */
.viewer-badge {
  display: none;
  padding: 4px 10px;
  background: var(--bg-tertiary);
  border: 1px solid var(--border-color);
  border-radius: 4px;
  font-size: 0.75rem;
  color: var(--text-secondary);
}

/* Viewer Mode */
body.viewer-mode .editor-pane {
  display: none;
}

body.viewer-mode .preview-pane {
  border-left: none;
  overflow-y: auto;
}

body.viewer-mode .preview-pane .pane-header {
  position: sticky;
  top: 0;
  z-index: 100;
}

body.viewer-mode #preview {
  max-width: 900px;
  margin: 0 auto;
  padding: 40px 20px;
  overflow-y: visible;
  flex: none;
}

body.viewer-mode #fileDropdown {
  display: none;
}

body.viewer-mode #copyDropdown {
  display: none;
}

body.viewer-mode #downloadDropdown {
  display: none;
}

#copyViewerOnlyBtn {
  display: none;
}

body.viewer-mode #copyViewerOnlyBtn {
  display: flex;
}

body.viewer-mode .viewer-badge {
  display: block;
}

body.viewer-mode .status-bar {
  display: none;
}

/* Status Bar */
.status-bar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 4px 16px;
  background: var(--bg-secondary);
  border-top: 1px solid var(--border-color);
  font-size: 0.75rem;
  color: var(--text-secondary);
  flex-shrink: 0;
}

.status-left,
.status-right {
  display: flex;
  gap: 16px;
}

.status-item {
  white-space: nowrap;
}

/* Responsive */
@media (max-width: 768px) {
  .main {
    flex-direction: column;
  }

  .editor-pane {
    border-right: none;
    border-bottom: 1px solid var(--border-color);
  }

  .editor-pane,
  .preview-pane {
    flex: 1;
    min-height: 0;
  }

  .header-actions {
    gap: 4px;
  }

  .btn {
    padding: 6px 10px;
    font-size: 0.8rem;
  }

  .btn span {
    display: none;
  }

  /* Viewer mode mobile - use full width */
  body.viewer-mode #preview {
    max-width: 100%;
    padding: 20px 16px;
  }

  /* Status bar mobile */
  .status-bar {
    font-size: 0.65rem;
    padding: 4px 10px;
  }

  .status-left,
  .status-right {
    gap: 8px;
  }

  #statusCompression {
    display: none;
  }
}