/* ========================================================================
   MerMD Web App — Styles
   Material 3 Purple Theme — Matching Android App
   ======================================================================== */

@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700&family=JetBrains+Mono:wght@400;500&display=swap');

/* ── CSS Custom Properties ────────────────────────────────────────────── */
:root {
  /* Material 3 Dark Theme (default) */
  --app-primary: #D0BCFF;
  --app-on-primary: #381E72;
  --app-primary-container: #4F378B;
  --app-on-primary-container: #EADDFF;
  --app-secondary: #CCC2DC;
  --app-secondary-container: #4A4458;
  --app-surface: #1C1B1F;
  --app-surface-dim: #141218;
  --app-surface-container: #211F26;
  --app-surface-container-low: #1D1B20;
  --app-surface-container-high: #2B2930;
  --app-surface-variant: #49454F;
  --app-on-surface: #E6E1E5;
  --app-on-surface-variant: #CAC4D0;
  --app-outline: #938F99;
  --app-outline-variant: #49454F;
  --app-error: #F2B8B5;
  --app-toolbar: #2B2930;
  --app-border: rgba(202, 196, 208, 0.12);
  --app-shadow: rgba(0, 0, 0, 0.3);
  --app-radius: 12px;
  --app-radius-sm: 8px;
  --app-radius-lg: 16px;
  --app-transition: 0.2s cubic-bezier(0.4, 0, 0.2, 1);

  /* Editor */
  --editor-bg: #1E1E2E;
  --editor-text: #CDD6F4;
  --editor-line-num: #585B70;
  --editor-cursor: #D0BCFF;
  --editor-selection: rgba(208, 188, 255, 0.2);
  --editor-gutter: #181825;

  /* Preview - matches Android dark theme exactly */
  --preview-bg: #0d1117;
  --preview-text: #c9d1d9;
  --preview-heading-border: #21262d;
  --preview-link: #58a6ff;
  --preview-blockquote-text: #8b949e;
  --preview-blockquote-border: #3b434b;
  --preview-code-bg: rgba(110, 118, 129, 0.4);
  --preview-pre-bg: #161b22;
  --preview-table-border: #3b434b;
  --preview-table-header-bg: #161b22;
  --preview-table-stripe: #161b22;
  --preview-hr: #21262d;
  --preview-h6: #8b949e;

  /* Mermaid */
  --mermaid-bg: linear-gradient(135deg, #161b22 0%, #1c2128 100%);
  --mermaid-border: #30363d;
}

/* Light Theme */
[data-theme="light"] {
  --app-primary: #6750A4;
  --app-on-primary: #FFFFFF;
  --app-primary-container: #EADDFF;
  --app-on-primary-container: #21005D;
  --app-secondary: #625B71;
  --app-secondary-container: #E8DEF8;
  --app-surface: #FFFBFE;
  --app-surface-dim: #DED8E1;
  --app-surface-container: #F3EDF7;
  --app-surface-container-low: #F7F2FA;
  --app-surface-container-high: #ECE6F0;
  --app-surface-variant: #E7E0EC;
  --app-on-surface: #1C1B1F;
  --app-on-surface-variant: #49454F;
  --app-outline: #79747E;
  --app-outline-variant: #CAC4D0;
  --app-error: #B3261E;
  --app-toolbar: #CDBDE0;
  --app-border: rgba(0, 0, 0, 0.08);
  --app-shadow: rgba(0, 0, 0, 0.1);

  --editor-bg: #FAFAFA;
  --editor-text: #1C1B1F;
  --editor-line-num: #9CA3AF;
  --editor-cursor: #6750A4;
  --editor-selection: rgba(103, 80, 164, 0.15);
  --editor-gutter: #F3F4F6;

  --preview-bg: #ffffff;
  --preview-text: #24292e;
  --preview-heading-border: #eaecef;
  --preview-link: #0366d6;
  --preview-blockquote-text: #6a737d;
  --preview-blockquote-border: #dfe2e5;
  --preview-code-bg: rgba(27, 31, 35, 0.05);
  --preview-pre-bg: #f6f8fa;
  --preview-table-border: #dfe2e5;
  --preview-table-header-bg: #f6f8fa;
  --preview-table-stripe: #f6f8fa;
  --preview-hr: #e1e4e8;
  --preview-h6: #6a737d;

  --mermaid-bg: linear-gradient(135deg, #f6f8fa 0%, #eef1f5 100%);
  --mermaid-border: #d0d7de;
}

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

html, body {
  height: 100%;
  overflow: hidden;
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
  background: var(--app-surface-dim);
  color: var(--app-on-surface);
}

/* ── App Shell ────────────────────────────────────────────────────────── */
.app-container {
  display: flex;
  flex-direction: column;
  height: 100vh;
  width: 100vw;
  overflow: hidden;
}

/* ── Top Toolbar ──────────────────────────────────────────────────────── */
.app-toolbar {
  display: flex;
  align-items: center;
  gap: 4px;
  padding: 6px 12px;
  background: var(--app-toolbar);
  border-bottom: 1px solid var(--app-border);
  min-height: 48px;
  z-index: 100;
  flex-shrink: 0;
}

.app-toolbar .brand {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-right: 8px;
  text-decoration: none;
  color: var(--app-on-surface);
}

.app-toolbar .brand img {
  width: 28px;
  height: 28px;
  border-radius: 6px;
}

.app-toolbar .brand span {
  font-weight: 700;
  font-size: 16px;
  letter-spacing: -0.02em;
}

.toolbar-divider {
  width: 1px;
  height: 28px;
  background: var(--app-outline-variant);
  margin: 0 6px;
}

.toolbar-group {
  display: flex;
  align-items: center;
  gap: 2px;
}

.toolbar-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  padding: 6px 10px;
  border: none;
  border-radius: var(--app-radius-sm);
  background: transparent;
  color: var(--app-on-surface-variant);
  font-family: inherit;
  font-size: 13px;
  font-weight: 500;
  cursor: pointer;
  transition: all var(--app-transition);
  white-space: nowrap;
  position: relative;
}

.toolbar-btn:hover {
  background: var(--app-surface-container-high);
  color: var(--app-on-surface);
}

.toolbar-btn:active {
  transform: scale(0.95);
}

.toolbar-btn.active {
  background: var(--app-primary-container);
  color: var(--app-on-primary-container);
}

.toolbar-btn svg {
  width: 18px;
  height: 18px;
  flex-shrink: 0;
}

.toolbar-btn .label {
  display: inline;
}

.toolbar-spacer {
  flex: 1;
}

/* ── Mode Switcher (Editor / Split / Viewer) ──────────────────────────── */
.mode-switcher {
  display: flex;
  background: var(--app-surface-container);
  border-radius: var(--app-radius);
  padding: 3px;
  gap: 2px;
}

.mode-btn {
  padding: 5px 12px;
  border: none;
  border-radius: 9px;
  background: transparent;
  color: var(--app-on-surface-variant);
  font-family: inherit;
  font-size: 12px;
  font-weight: 500;
  cursor: pointer;
  transition: all var(--app-transition);
}

.mode-btn:hover {
  color: var(--app-on-surface);
}

.mode-btn.active {
  background: var(--app-primary);
  color: var(--app-on-primary);
  box-shadow: 0 1px 3px var(--app-shadow);
}

/* ── Main Content Area ────────────────────────────────────────────────── */
.app-main {
  flex: 1;
  display: flex;
  overflow: hidden;
  position: relative;
}

/* ── TOC Sidebar ──────────────────────────────────────────────────────── */
.toc-sidebar {
  width: 0;
  overflow: hidden;
  background: var(--app-surface-container);
  border-right: 1px solid var(--app-border);
  transition: width 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  flex-shrink: 0;
}

.toc-sidebar.open {
  width: 260px;
}

.toc-sidebar-inner {
  width: 260px;
  height: 100%;
  overflow-y: auto;
  padding: 12px 0;
}

.toc-header {
  padding: 8px 16px 12px;
  font-size: 11px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--app-outline);
}

.toc-item {
  display: block;
  padding: 6px 16px;
  color: var(--app-on-surface-variant);
  text-decoration: none;
  font-size: 13px;
  line-height: 1.4;
  cursor: pointer;
  transition: all var(--app-transition);
  border-left: 3px solid transparent;
}

.toc-item:hover {
  background: var(--app-surface-container-high);
  color: var(--app-on-surface);
}

.toc-item.active {
  color: var(--app-primary);
  border-left-color: var(--app-primary);
  background: rgba(208, 188, 255, 0.08);
}

.toc-item[data-level="2"] { padding-left: 28px; }
.toc-item[data-level="3"] { padding-left: 40px; font-size: 12px; }
.toc-item[data-level="4"] { padding-left: 52px; font-size: 12px; }
.toc-item[data-level="5"] { padding-left: 64px; font-size: 11px; }
.toc-item[data-level="6"] { padding-left: 76px; font-size: 11px; }

/* ── Editor / Preview Panels ──────────────────────────────────────────── */
.panels {
  flex: 1;
  display: flex;
  overflow: hidden;
}

.editor-panel {
  flex: 1;
  display: flex;
  flex-direction: column;
  min-width: 0;
  border-right: 1px solid var(--app-border);
  background: var(--editor-bg);
}

.editor-panel.hidden { display: none; }

.preview-panel {
  flex: 1;
  display: flex;
  flex-direction: column;
  min-width: 0;
  background: var(--preview-bg);
  overflow: hidden;
}

.preview-panel.hidden { display: none; }

/* ── Resize Handle ────────────────────────────────────────────────────── */
.resize-handle {
  width: 5px;
  cursor: col-resize;
  background: var(--app-border);
  transition: background var(--app-transition);
  flex-shrink: 0;
  position: relative;
}

.resize-handle:hover,
.resize-handle.dragging {
  background: var(--app-primary);
}

.resize-handle.hidden { display: none; }

/* ── Editor ───────────────────────────────────────────────────────────── */
.editor-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 6px 12px;
  background: var(--editor-gutter);
  border-bottom: 1px solid var(--app-border);
  min-height: 34px;
}

.editor-header-title {
  font-size: 12px;
  font-weight: 500;
  color: var(--app-outline);
  text-transform: uppercase;
  letter-spacing: 0.06em;
}

.editor-stats {
  font-size: 11px;
  color: var(--app-outline);
  font-family: 'JetBrains Mono', monospace;
}

#markdownEditor {
  flex: 1;
  width: 100%;
  resize: none;
  border: none;
  outline: none;
  padding: 16px 20px;
  font-family: 'JetBrains Mono', monospace;
  font-size: 14px;
  line-height: 1.7;
  color: var(--editor-text);
  background: var(--editor-bg);
  tab-size: 4;
  caret-color: var(--editor-cursor);
  overflow-y: auto;
}

#markdownEditor::selection {
  background: var(--editor-selection);
}

#markdownEditor::placeholder {
  color: var(--app-outline);
}

/* ── Preview ──────────────────────────────────────────────────────────── */
.preview-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 6px 12px;
  background: var(--app-surface-container-low);
  border-bottom: 1px solid var(--app-border);
  min-height: 34px;
}

.preview-header-title {
  font-size: 12px;
  font-weight: 500;
  color: var(--app-outline);
  text-transform: uppercase;
  letter-spacing: 0.06em;
}

.preview-content {
  flex: 1;
  overflow-y: auto;
  overflow-x: hidden;
  padding: 24px;
  scroll-behavior: smooth;
}

/* ── Markdown Rendered Content — Matching Android App Exactly ─────────── */
.markdown-content {
  max-width: 860px;
  margin: 0 auto;
  word-wrap: break-word;
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
  line-height: 1.6;
  color: var(--preview-text);
}

.markdown-content h1 { font-size: 2em; margin: 0.67em 0; border-bottom: 1px solid var(--preview-heading-border); padding-bottom: 0.3em; }
.markdown-content h2 { font-size: 1.5em; margin: 0.75em 0; border-bottom: 1px solid var(--preview-heading-border); padding-bottom: 0.3em; }
.markdown-content h3 { font-size: 1.25em; margin: 0.83em 0; }
.markdown-content h4 { font-size: 1em; margin: 1em 0; }
.markdown-content h5 { font-size: 0.875em; margin: 1.33em 0; }
.markdown-content h6 { font-size: 0.85em; margin: 1.67em 0; color: var(--preview-h6); }

.markdown-content p { margin: 1em 0; }

.markdown-content a { color: var(--preview-link); text-decoration: none; }
.markdown-content a:hover { text-decoration: underline; }

.markdown-content blockquote {
  margin: 1em 0;
  padding: 0 1em;
  color: var(--preview-blockquote-text);
  border-left: 4px solid var(--preview-blockquote-border);
}

.markdown-content ul, .markdown-content ol { padding-left: 2em; margin: 1em 0; }
.markdown-content li { margin: 0.25em 0; }

/* Task lists */
.markdown-content li input[type="checkbox"] {
  margin-right: 6px;
  accent-color: var(--app-primary);
}

.markdown-content table {
  border-collapse: collapse;
  width: 100%;
  margin: 1em 0;
  display: block;
  overflow-x: auto;
}

.markdown-content th, .markdown-content td {
  border: 1px solid var(--preview-table-border);
  padding: 6px 13px;
}

.markdown-content th { background-color: var(--preview-table-header-bg); font-weight: 600; }
.markdown-content tr:nth-child(even) { background-color: var(--preview-table-stripe); }

.markdown-content code {
  background-color: var(--preview-code-bg);
  border-radius: 3px;
  padding: 0.2em 0.4em;
  font-family: 'JetBrains Mono', 'SFMono-Regular', Consolas, monospace;
  font-size: 85%;
}

.markdown-content pre {
  background-color: var(--preview-pre-bg);
  border-radius: 6px;
  padding: 16px;
  overflow-x: auto;
  line-height: 1.45;
  position: relative;
}

.markdown-content pre code {
  background-color: transparent;
  padding: 0;
  font-size: 13px;
}

.markdown-content img {
  max-width: 100%;
  height: auto;
  border-radius: 6px;
}

.markdown-content hr {
  height: 0.25em;
  padding: 0;
  margin: 24px 0;
  background-color: var(--preview-hr);
  border: 0;
}

/* ── Mermaid Diagrams (matching Android) ──────────────────────────────── */
.markdown-content .mermaid {
  cursor: pointer;
  transition: transform 0.2s;
  margin: 1em 0;
  padding: 16px 8px;
  border-radius: 8px;
  background: var(--mermaid-bg);
  border: 1px solid var(--mermaid-border);
  overflow-x: auto;
  text-align: center;
}

.markdown-content .mermaid svg {
  display: block;
  margin: 0 auto;
  background: transparent !important;
}

.markdown-content .mermaid:hover {
  box-shadow: 0 2px 12px var(--app-shadow);
}

/* ── Copy Code Button ─────────────────────────────────────────────────── */
.copy-code-btn {
  position: absolute;
  top: 8px;
  right: 8px;
  padding: 4px 8px;
  border: 1px solid var(--app-outline-variant);
  border-radius: 6px;
  background: var(--app-surface-container);
  color: var(--app-on-surface-variant);
  font-size: 11px;
  font-family: inherit;
  cursor: pointer;
  opacity: 0;
  transition: opacity var(--app-transition);
}

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

.copy-code-btn:hover {
  background: var(--app-primary-container);
  color: var(--app-on-primary-container);
}

/* ── Welcome Screen ───────────────────────────────────────────────────── */
.welcome-screen {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  height: 100%;
  gap: 24px;
  padding: 32px;
  text-align: center;
}

.welcome-icon {
  width: 80px;
  height: 80px;
  border-radius: 20px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--app-primary-container);
  font-size: 36px;
}

.welcome-title {
  font-size: 24px;
  font-weight: 700;
  color: var(--app-on-surface);
}

.welcome-subtitle {
  font-size: 14px;
  color: var(--app-on-surface-variant);
  max-width: 400px;
  line-height: 1.5;
}

.welcome-actions {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
  justify-content: center;
}

.welcome-btn {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 12px 20px;
  border-radius: var(--app-radius);
  border: 1px solid var(--app-border);
  background: var(--app-surface-container);
  color: var(--app-on-surface);
  font-family: inherit;
  font-size: 14px;
  font-weight: 500;
  cursor: pointer;
  transition: all var(--app-transition);
}

.welcome-btn:hover {
  background: var(--app-surface-container-high);
  border-color: var(--app-primary);
  transform: translateY(-1px);
  box-shadow: 0 4px 12px var(--app-shadow);
}

.welcome-btn.primary {
  background: var(--app-primary);
  color: var(--app-on-primary);
  border-color: transparent;
}

.welcome-btn.primary:hover {
  opacity: 0.9;
}

.welcome-shortcuts {
  display: flex;
  gap: 16px;
  margin-top: 8px;
}

.shortcut-pill {
  display: flex;
  align-items: center;
  gap: 6px;
  font-size: 12px;
  color: var(--app-outline);
}

.shortcut-pill kbd {
  padding: 2px 6px;
  border-radius: 4px;
  background: var(--app-surface-container-high);
  border: 1px solid var(--app-outline-variant);
  font-family: 'JetBrains Mono', monospace;
  font-size: 11px;
}

/* ── Settings Panel ───────────────────────────────────────────────────── */
.settings-overlay {
  display: none;
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.5);
  z-index: 1000;
  justify-content: flex-end;
}

.settings-overlay.open {
  display: flex;
}

.settings-panel {
  width: 320px;
  height: 100%;
  background: var(--app-surface-container);
  border-left: 1px solid var(--app-border);
  overflow-y: auto;
  padding: 20px;
  animation: slideInRight 0.3s ease;
}

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

.settings-title {
  font-size: 18px;
  font-weight: 600;
  margin-bottom: 20px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.settings-close {
  width: 32px;
  height: 32px;
  border: none;
  border-radius: 50%;
  background: transparent;
  color: var(--app-on-surface);
  font-size: 18px;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
}

.settings-close:hover {
  background: var(--app-surface-container-high);
}

.settings-section {
  margin-bottom: 20px;
}

.settings-label {
  font-size: 12px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--app-outline);
  margin-bottom: 8px;
}

.settings-select,
.settings-input {
  width: 100%;
  padding: 10px 12px;
  border-radius: var(--app-radius-sm);
  border: 1px solid var(--app-outline-variant);
  background: var(--app-surface);
  color: var(--app-on-surface);
  font-family: inherit;
  font-size: 14px;
  cursor: pointer;
  transition: border-color var(--app-transition);
}

.settings-select:focus,
.settings-input:focus {
  outline: none;
  border-color: var(--app-primary);
}

.settings-toggle {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 10px 0;
}

.settings-toggle-label {
  font-size: 14px;
  color: var(--app-on-surface);
}

/* Toggle Switch */
.toggle-switch {
  position: relative;
  width: 48px;
  height: 26px;
}

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

.toggle-slider {
  position: absolute;
  cursor: pointer;
  inset: 0;
  background: var(--app-surface-variant);
  border-radius: 26px;
  transition: all var(--app-transition);
}

.toggle-slider::before {
  content: '';
  position: absolute;
  width: 20px;
  height: 20px;
  left: 3px;
  bottom: 3px;
  background: var(--app-on-surface);
  border-radius: 50%;
  transition: all var(--app-transition);
}

.toggle-switch input:checked + .toggle-slider {
  background: var(--app-primary);
}

.toggle-switch input:checked + .toggle-slider::before {
  transform: translateX(22px);
  background: var(--app-on-primary);
}

/* ── Toast Notification ───────────────────────────────────────────────── */
.toast {
  position: fixed;
  bottom: 24px;
  left: 50%;
  transform: translateX(-50%) translateY(80px);
  padding: 12px 24px;
  border-radius: var(--app-radius);
  background: var(--app-on-surface);
  color: var(--app-surface);
  font-size: 14px;
  font-weight: 500;
  box-shadow: 0 4px 24px var(--app-shadow);
  z-index: 2000;
  transition: transform 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  pointer-events: none;
}

.toast.show {
  transform: translateX(-50%) translateY(0);
}

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

.dropdown-menu {
  display: none;
  position: absolute;
  top: calc(100% + 4px);
  left: 0;
  min-width: 200px;
  background: var(--app-surface-container);
  border: 1px solid var(--app-border);
  border-radius: var(--app-radius);
  box-shadow: 0 8px 32px var(--app-shadow);
  z-index: 200;
  padding: 6px;
  animation: dropdownIn 0.15s ease;
}

.dropdown-menu.right {
  left: auto;
  right: 0;
}

.dropdown-menu.open {
  display: block;
}

@keyframes dropdownIn {
  from { opacity: 0; transform: translateY(-4px); }
  to { opacity: 1; transform: translateY(0); }
}

.dropdown-item {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 8px 12px;
  border: none;
  border-radius: 6px;
  background: transparent;
  color: var(--app-on-surface);
  font-family: inherit;
  font-size: 13px;
  cursor: pointer;
  width: 100%;
  text-align: left;
  transition: background var(--app-transition);
}

.dropdown-item:hover {
  background: var(--app-surface-container-high);
}

.dropdown-item svg {
  width: 16px;
  height: 16px;
  flex-shrink: 0;
  color: var(--app-on-surface-variant);
}

.dropdown-divider {
  height: 1px;
  background: var(--app-border);
  margin: 4px 0;
}

/* ── File input hidden ────────────────────────────────────────────────── */
#fileInput {
  display: none;
}

/* ── Fullscreen Diagram Overlay ───────────────────────────────────────── */
.diagram-overlay {
  display: none;
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.95);
  z-index: 3000;
  align-items: center;
  justify-content: center;
  opacity: 0;
  transition: opacity 0.3s ease;
}

.diagram-overlay.active {
  display: flex;
  opacity: 1;
}

.diagram-overlay-content {
  width: 100%;
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
  position: relative;
}

.diagram-overlay-content > svg {
  max-width: 90%;
  max-height: 90%;
  cursor: grab;
}

.diagram-close-btn {
  position: fixed;
  top: 16px;
  right: 16px;
  width: 40px;
  height: 40px;
  border-radius: 50%;
  border: none;
  background: rgba(255, 255, 255, 0.1);
  color: white;
  font-size: 20px;
  cursor: pointer;
  z-index: 3001;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: background 0.2s;
}

.diagram-close-btn:hover {
  background: rgba(255, 255, 255, 0.2);
}

/* ── Responsive ───────────────────────────────────────────────────────── */
@media (max-width: 768px) {
  .toolbar-btn .label { display: none; }
  .toc-sidebar.open { width: 220px; }
  .toc-sidebar-inner { width: 220px; }
  .settings-panel { width: 100%; }
  .mode-btn { padding: 5px 8px; font-size: 11px; }
  .welcome-shortcuts { display: none; }
}

/* ── Content Width Variants ───────────────────────────────────────────── */
.markdown-content.width-narrow { max-width: 580px; }
.markdown-content.width-normal { max-width: 720px; }
.markdown-content.width-wide { max-width: 860px; }
.markdown-content.width-full { max-width: 100%; }

/* ── Scrollbar Styling ────────────────────────────────────────────────── */
::-webkit-scrollbar { width: 8px; height: 8px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb {
  background: var(--app-outline-variant);
  border-radius: 4px;
}
::-webkit-scrollbar-thumb:hover { background: var(--app-outline); }

/* ── Print ────────────────────────────────────────────────────────────── */
@media print {
  .app-toolbar, .toc-sidebar, .editor-panel, .resize-handle,
  .editor-header, .preview-header, .settings-overlay, .formatting-toolbar,
  .find-bar { display: none !important; }
  .preview-panel { flex: 1 !important; }
  .preview-content { padding: 0 !important; overflow: visible !important; }
  .markdown-content { max-width: 100% !important; }
  body { overflow: visible !important; }
  html, body { height: auto !important; }
}

/* ── Formatting Toolbar ───────────────────────────────────────────────── */
.formatting-toolbar {
  display: flex;
  align-items: center;
  gap: 2px;
  padding: 4px 8px;
  background: var(--editor-gutter);
  border-bottom: 1px solid var(--app-border);
  overflow-x: auto;
  flex-shrink: 0;
}

.fmt-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  min-width: 30px;
  height: 28px;
  padding: 0 6px;
  border: none;
  border-radius: 6px;
  background: transparent;
  color: var(--app-on-surface-variant);
  font-family: inherit;
  font-size: 13px;
  cursor: pointer;
  transition: all var(--app-transition);
  white-space: nowrap;
}

.fmt-btn:hover {
  background: var(--app-surface-container-high);
  color: var(--app-on-surface);
}

.fmt-btn:active {
  transform: scale(0.9);
}

.fmt-divider {
  width: 1px;
  height: 20px;
  background: var(--app-outline-variant);
  margin: 0 4px;
  flex-shrink: 0;
}

/* ── Find & Replace Bar ───────────────────────────────────────────────── */
.find-bar {
  display: none;
  align-items: center;
  gap: 6px;
  padding: 6px 12px;
  background: var(--editor-gutter);
  border-bottom: 1px solid var(--app-border);
  flex-shrink: 0;
}

.find-bar.open {
  display: flex;
}

.find-input {
  flex: 1;
  min-width: 100px;
  max-width: 200px;
  padding: 5px 10px;
  border-radius: 6px;
  border: 1px solid var(--app-outline-variant);
  background: var(--app-surface);
  color: var(--app-on-surface);
  font-family: inherit;
  font-size: 13px;
  outline: none;
  transition: border-color var(--app-transition);
}

.find-input:focus {
  border-color: var(--app-primary);
}

.find-btn {
  padding: 5px 10px;
  border: 1px solid var(--app-outline-variant);
  border-radius: 6px;
  background: transparent;
  color: var(--app-on-surface-variant);
  font-family: inherit;
  font-size: 12px;
  cursor: pointer;
  transition: all var(--app-transition);
  white-space: nowrap;
}

.find-btn:hover {
  background: var(--app-surface-container-high);
  color: var(--app-on-surface);
}

/* ── Drag & Drop Overlay ──────────────────────────────────────────────── */
.drop-overlay {
  display: none;
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.7);
  z-index: 5000;
  align-items: center;
  justify-content: center;
}

.drop-overlay.active {
  display: flex;
}

.drop-overlay-content {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 48px;
  border: 3px dashed var(--app-primary);
  border-radius: 24px;
  background: var(--app-surface-container);
  color: var(--app-on-surface);
  text-align: center;
  animation: dropPulse 1.5s ease-in-out infinite;
}

@keyframes dropPulse {
  0%, 100% { transform: scale(1); border-color: var(--app-primary); }
  50% { transform: scale(1.02); border-color: var(--app-on-primary-container); }
}

/* ── Save Indicator ───────────────────────────────────────────────────── */
.save-indicator {
  font-size: 11px;
  color: var(--app-outline);
  font-family: 'JetBrains Mono', monospace;
  opacity: 0.5;
  transition: opacity 0.3s ease;
}

/* ── Import Modal ─────────────────────────────────────────────────────── */
.import-modal-overlay {
  display: none;
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.6);
  z-index: 4000;
  align-items: center;
  justify-content: center;
}

.import-modal-overlay.open {
  display: flex;
}

.import-modal {
  width: 520px;
  max-width: 90vw;
  background: var(--app-surface-container);
  border: 1px solid var(--app-border);
  border-radius: var(--app-radius-lg);
  padding: 24px;
  box-shadow: 0 16px 48px var(--app-shadow);
  animation: dropdownIn 0.2s ease;
}

.import-modal-title {
  font-size: 18px;
  font-weight: 600;
  margin-bottom: 12px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.import-url-input {
  width: 100%;
  padding: 12px 16px;
  border-radius: var(--app-radius-sm);
  border: 2px solid var(--app-outline-variant);
  background: var(--app-surface);
  color: var(--app-on-surface);
  font-family: 'JetBrains Mono', monospace;
  font-size: 14px;
  outline: none;
  transition: border-color var(--app-transition);
}

.import-url-input:focus {
  border-color: var(--app-primary);
}

.import-examples {
  margin-top: 10px;
  font-size: 12px;
  color: var(--app-outline);
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.import-examples code {
  background: var(--app-surface-container-high);
  padding: 3px 8px;
  border-radius: 4px;
  font-family: 'JetBrains Mono', monospace;
  font-size: 11px;
  word-break: break-all;
}

.import-modal-actions {
  display: flex;
  justify-content: flex-end;
  gap: 8px;
  margin-top: 16px;
}

/* ── Responsive additions ─────────────────────────────────────────────── */
@media (max-width: 768px) {
  .formatting-toolbar {
    padding: 3px 6px;
    gap: 1px;
  }
  .fmt-btn {
    min-width: 26px;
    height: 24px;
    font-size: 12px;
  }
  .find-bar {
    flex-wrap: wrap;
  }
  .find-input {
    max-width: 120px;
  }
  .import-modal {
    width: 95vw;
  }
}