:root {
  /* Dark mode color theme (Catppuccin Mocha inspired / Sleek Dark) */
  --bg-base: #0b0b0e;
  --bg-surface: #15151c;
  --bg-element: #21212e;
  --border-color: #2d2d3d;
  --text-main: #f4f4f7;
  --text-muted: #9e9eb0;
  
  --accent: #89b4fa;
  --accent-rgb: 137, 180, 250;
  --success: #a6e3a1;
  --warning: #f9e2af;
  --danger: #f38ba8;
  
  --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.3);
  --shadow-md: 0 8px 24px rgba(0, 0, 0, 0.4);
  --shadow-lg: 0 16px 40px rgba(0, 0, 0, 0.6);
  
  --font-family: 'Inter', 'Noto Sans JP', sans-serif;
  --header-height: 64px;
}

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

html, body {
  font-family: var(--font-family);
  background-color: var(--bg-base);
  color: var(--text-main);
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  width: 100%;
  height: 100%;
  overflow: hidden;
  margin: 0;
  padding: 0;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* App Container */
.app-container {
  display: flex;
  flex-direction: column;
  height: 100%;
  width: 100%;
  position: relative;
  overflow: hidden;
}

/* Header */
.app-header {
  height: var(--header-height);
  background-color: rgba(21, 21, 28, 0.85);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border-color);
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 0 20px;
  z-index: 100;
  box-shadow: var(--shadow-sm);
}

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

.logo-icon {
  color: var(--accent);
  font-size: 28px;
  animation: logo-glow 3s infinite ease-in-out;
}

@keyframes logo-glow {
  0%, 100% { filter: drop-shadow(0 0 2px rgba(137, 180, 250, 0.3)); }
  50% { filter: drop-shadow(0 0 8px rgba(137, 180, 250, 0.8)); }
}

.header-logo h1 {
  font-size: 20px;
  font-weight: 700;
  letter-spacing: 0.5px;
  background: linear-gradient(135deg, #ffffff 30%, var(--accent) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

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

/* Buttons styling */
.icon-btn {
  background-color: transparent;
  border: 1px solid transparent;
  color: var(--text-main);
  padding: 8px 12px;
  border-radius: 8px;
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: 6px;
  font-family: var(--font-family);
  font-size: 14px;
  font-weight: 500;
  transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
}

.icon-btn span.material-icons-round {
  font-size: 20px;
}

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

.icon-btn:active {
  transform: scale(0.97);
}

.icon-btn.active {
  background-color: rgba(137, 180, 250, 0.15) !important;
  border-color: rgba(137, 180, 250, 0.3) !important;
  color: var(--accent) !important;
}

.divider {
  width: 1px;
  height: 24px;
  background-color: var(--border-color);
  margin: 0 4px;
}

/* Dropdown Menu */
.dropdown {
  position: relative;
  display: inline-block;
}

.dropdown-menu {
  display: none;
  position: absolute;
  right: 0;
  top: 100%;
  margin-top: 6px;
  background-color: var(--bg-surface);
  border: 1px solid var(--border-color);
  border-radius: 8px;
  box-shadow: var(--shadow-lg);
  min-width: 160px;
  z-index: 110;
  overflow: hidden;
  animation: dropdown-fade-in 0.2s ease-out;
}

@keyframes dropdown-fade-in {
  from { opacity: 0; transform: translateY(-8px); }
  to { opacity: 1; transform: translateY(0); }
}

.dropdown-menu button {
  background: none;
  border: none;
  color: var(--text-main);
  width: 100%;
  padding: 10px 16px;
  text-align: left;
  font-family: var(--font-family);
  font-size: 14px;
  cursor: pointer;
  display: flex;
  align-items: center;
  white-space: nowrap;
  gap: 8px;
  transition: background-color 0.15s ease;
}

.dropdown-menu button span {
  font-size: 18px;
  color: var(--text-muted);
}

.dropdown-menu button:hover {
  background-color: var(--bg-element);
}

.dropdown-menu button:hover span {
  color: var(--accent);
}

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

/* Main Workspace */
.app-workspace {
  flex: 1;
  display: flex;
  position: relative;
  overflow: hidden;
  width: 100%;
  height: calc(100vh - var(--header-height));
  height: calc(100dvh - var(--header-height));
}

/* Canvas Container */
.canvas-container {
  flex: 1;
  width: 100%;
  height: 100%;
  position: relative;
  background-color: var(--bg-base);
  cursor: grab;
  overflow: hidden;
  touch-action: none;
}

.canvas-container:active {
  cursor: grabbing;
}

/* WebKit: branch lines drawn on canvas overlay (SVG paths fail under CSS transform) */
.connections-canvas {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  pointer-events: none;
  z-index: 0;
}

/* HTML marquee selection overlay (reliable on WebKit; also used on all platforms) */
.marquee-overlay {
  position: absolute;
  box-sizing: border-box;
  pointer-events: none;
  z-index: 2;
  display: none;
  border: 1.5px dashed var(--accent);
  background: rgba(137, 180, 250, 0.15);
}

/* SVG Elements styles */
#mindmap-svg {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  display: block;
  user-select: none;
  -webkit-user-select: none;
  overflow: hidden !important;
  z-index: 1;
}

/* Background grid */
.background-grid {
  pointer-events: none;
}

/* Connections (Paths) */
.connection-path {
  fill: none;
  stroke-linecap: round;
  transition: stroke 0.3s ease, stroke-width 0.3s ease;
}

/* ForeignObject Node Container */
.mindmap-node-wrapper {
  overflow: visible !important;
}

/* HTML Mindmap Node */
.mindmap-node {
  position: relative;
  padding: 8px 14px;
  border-radius: 6px;
  background-color: var(--bg-surface);
  border: 2px solid var(--border-color);
  color: var(--text-main);
  font-size: 13px;
  font-weight: 500;
  line-height: 1.3;
  box-shadow: var(--shadow-sm);
  display: flex;
  align-items: center;
  justify-content: flex-start;
  text-align: left;
  cursor: pointer;
  width: 100%;
  height: 100%;
  min-height: 38px;
  white-space: pre;
  word-break: keep-all;
  transition: border-color 0.2s ease, 
              box-shadow 0.2s ease,
              background-color 0.2s ease;
  user-select: none;
}

.mindmap-node:hover {
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.35);
  border-color: rgba(137, 180, 250, 0.5);
}

/* Specific styling for hierarchy levels */
.mindmap-node.level-0 {
  font-size: 15px;
  font-weight: 700;
  padding: 10px 18px;
  border-radius: 8px;
  box-shadow: var(--shadow-md);
  border-width: 3px;
  min-height: 44px;
}

.mindmap-node.level-1 {
  font-size: 14px;
  font-weight: 600;
  border-width: 2px;
}

/* Selected Node State */
.mindmap-node.selected {
  border-color: var(--accent) !important;
  box-shadow: 0 0 0 2px rgba(137, 180, 250, 0.25), 
              0 0 8px rgba(137, 180, 250, 0.3);
}

.mindmap-node.active {
  border-color: var(--accent) !important;
  box-shadow: 0 0 0 4px rgba(137, 180, 250, 0.45), 
              0 0 16px rgba(137, 180, 250, 0.6);
}

/* SVG Marquee Area Selection Box */
.selection-box {
  fill: rgba(137, 180, 250, 0.15);
  stroke: var(--accent);
  stroke-width: 1.5;
  stroke-dasharray: 4 3;
  pointer-events: none;
}

/* Content Editable state */
.mindmap-node.editing {
  cursor: text;
  background-color: var(--bg-element) !important;
  outline: none;
  box-shadow: 0 0 0 4px rgba(137, 180, 250, 0.5);
  user-select: text;
  -webkit-user-select: text;
}

.node-text {
  width: 100%;
  max-width: 100%;
  display: inline-block;
  outline: none;
  white-space: pre;
  word-break: keep-all;
}

/* Zoom floating panel */
.zoom-controls {
  position: absolute;
  bottom: 24px;
  left: 24px;
  background-color: rgba(21, 21, 28, 0.8);
  backdrop-filter: blur(8px);
  border: 1px solid var(--border-color);
  border-radius: 30px;
  padding: 6px;
  display: flex;
  align-items: center;
  gap: 4px;
  z-index: 90;
  box-shadow: var(--shadow-md);
}

.zoom-btn {
  background: none;
  border: none;
  color: var(--text-main);
  width: 32px;
  height: 32px;
  border-radius: 50%;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: background-color 0.2s;
}

.zoom-btn span {
  font-size: 18px;
}

.zoom-btn:hover {
  background-color: var(--bg-element);
}

.zoom-level {
  font-size: 12px;
  font-weight: 600;
  color: var(--text-muted);
  width: 48px;
  text-align: center;
  user-select: none;
}

/* Search Panel Styling */
.search-panel {
  position: absolute;
  top: 80px;
  left: 50%;
  transform: translateX(-50%) translateY(-20px);
  background-color: rgba(30, 30, 46, 0.85);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border: 1px solid var(--border-color);
  border-radius: 30px;
  padding: 6px 12px 6px 16px;
  display: flex;
  align-items: center;
  gap: 12px;
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.4);
  z-index: 100;
  opacity: 0;
  pointer-events: none;
  transition: transform 0.3s cubic-bezier(0.34, 1.56, 0.64, 1), opacity 0.3s ease;
}

.search-panel.open {
  transform: translateX(-50%) translateY(0);
  opacity: 1;
  pointer-events: auto;
}

.search-panel .search-icon {
  color: var(--text-muted);
  font-size: 20px;
}

.search-panel input {
  background: transparent;
  border: none;
  outline: none;
  color: var(--text-main);
  font-family: var(--font-family);
  font-size: 14px;
  width: 200px;
}

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

.search-results-count {
  font-size: 12px;
  color: var(--text-muted);
  font-family: monospace;
  white-space: nowrap;
  padding: 2px 8px;
  background-color: var(--bg-element);
  border-radius: 12px;
}

.search-nav-btn, .search-close-btn {
  background: transparent;
  border: none;
  color: var(--text-muted);
  cursor: pointer;
  width: 28px;
  height: 28px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all 0.2s;
}

.search-nav-btn:hover {
  background-color: var(--bg-element);
  color: var(--text-main);
}

.search-close-btn:hover {
  background-color: rgba(243, 139, 168, 0.2);
  color: #f38ba8;
}

.search-nav-btn span, .search-close-btn span {
  font-size: 18px;
}

/* Search Highlights on Mindmap Nodes */
.mindmap-node.search-match {
  border-color: #f9e2af !important;
  box-shadow: 0 0 8px rgba(249, 226, 175, 0.3) !important;
}

.mindmap-node.search-current-match {
  border-color: #fab387 !important;
  background-color: rgba(250, 179, 135, 0.1) !important;
  box-shadow: 0 0 16px rgba(250, 179, 135, 0.6) !important;
  animation: search-current-pulse 1.5s infinite alternate;
}

@keyframes search-current-pulse {
  0% {
    box-shadow: 0 0 8px rgba(250, 179, 135, 0.4);
  }
  100% {
    box-shadow: 0 0 20px rgba(250, 179, 135, 0.8);
  }
}

/* Sidebar / Property Panel */
.property-sidebar {
  width: 340px;
  height: 100%;
  background-color: rgba(21, 21, 28, 0.9);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-left: 1px solid var(--border-color);
  position: absolute;
  right: 0;
  top: 0;
  z-index: 95;
  display: flex;
  flex-direction: column;
  transform: translateX(100%);
  visibility: hidden;
  transition: transform 0.3s cubic-bezier(0.4, 0, 0.2, 1), visibility 0.3s;
  box-shadow: var(--shadow-lg);
}

.property-sidebar.open {
  transform: translateX(0);
  visibility: visible;
}

.sidebar-header {
  padding: 20px;
  border-bottom: 1px solid var(--border-color);
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.sidebar-header h3 {
  font-size: 16px;
  font-weight: 600;
  color: var(--text-main);
}

.close-btn {
  background: none;
  border: none;
  color: var(--text-muted);
  cursor: pointer;
  border-radius: 50%;
  width: 28px;
  height: 28px;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all 0.2s;
}

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

.sidebar-content {
  flex: 1;
  overflow-y: auto;
  padding: 20px;
}

.node-preview-container {
  background-color: var(--bg-base);
  border: 1px solid var(--border-color);
  border-radius: 8px;
  padding: 16px;
  margin-bottom: 24px;
  text-align: center;
  min-height: 60px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.node-preview {
  font-size: 14px;
  font-weight: 500;
  color: var(--text-muted);
  word-break: break-all;
  max-width: 100%;
}

.setting-group {
  margin-bottom: 24px;
}

.setting-group > label {
  display: block;
  font-size: 12px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.8px;
  color: var(--text-muted);
  margin-bottom: 12px;
}

.btn-grid {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.action-btn {
  background-color: var(--bg-element);
  border: 1px solid var(--border-color);
  color: var(--text-main);
  padding: 12px;
  border-radius: 8px;
  cursor: pointer;
  font-family: var(--font-family);
  font-size: 14px;
  font-weight: 500;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  transition: all 0.2s;
}

.action-btn span {
  font-size: 20px;
}

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

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

.action-btn.primary:hover {
  background-color: #a6c8ff;
  border-color: #a6c8ff;
}

.action-btn.danger {
  color: var(--danger);
  border-color: rgba(243, 139, 168, 0.2);
  background-color: rgba(243, 139, 168, 0.05);
}

.action-btn.danger:hover {
  background-color: rgba(243, 139, 168, 0.15);
  border-color: var(--danger);
}

/* Color Picker Container */
.color-picker-wrapper {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.preset-colors {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 8px;
  min-width: 0;
}

.preset-color {
  height: 32px;
  border-radius: 6px;
  border: none;
  cursor: pointer;
  transition: transform 0.15s ease, box-shadow 0.15s ease;
}

.preset-color:hover {
  transform: scale(1.1);
  box-shadow: 0 0 8px rgba(255, 255, 255, 0.2);
}

.custom-color-input {
  display: flex;
  align-items: center;
  gap: 10px;
  background-color: var(--bg-element);
  border: 1px solid var(--border-color);
  padding: 8px 12px;
  border-radius: 8px;
  cursor: pointer;
}

.custom-color-input input[type="color"] {
  -webkit-appearance: none;
  border: none;
  width: 28px;
  height: 28px;
  border-radius: 50%;
  cursor: pointer;
  background: none;
}

.custom-color-input input[type="color"]::-webkit-color-swatch-wrapper {
  padding: 0;
}

.custom-color-input input[type="color"]::-webkit-color-swatch {
  border: 1px solid var(--border-color);
  border-radius: 50%;
  padding: 0;
}

.custom-color-input span {
  font-size: 13px;
  color: var(--text-muted);
}

.custom-color-input:hover {
  background-color: var(--border-color);
}

/* Modal Overlay */
.modal-overlay {
  display: none;
  position: fixed;
  top: 0;
  left: 0;
  width: 100vw;
  width: 100dvw;
  height: 100vh;
  height: 100dvh;
  background-color: rgba(5, 5, 8, 0.8);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  z-index: 200;
  align-items: center;
  justify-content: center;
  animation: modal-fade-in 0.25s cubic-bezier(0.16, 1, 0.3, 1);
}

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

@keyframes modal-fade-in {
  from { opacity: 0; }
  to { opacity: 1; }
}

.modal {
  background-color: var(--bg-surface);
  border: 1px solid var(--border-color);
  border-radius: 16px;
  width: 90%;
  max-width: 560px;
  max-height: 85vh;
  max-height: 85dvh;
  box-shadow: var(--shadow-lg);
  display: flex;
  flex-direction: column;
  overflow: hidden;
  animation: modal-slide-up 0.3s cubic-bezier(0.16, 1, 0.3, 1);
}

@keyframes modal-slide-up {
  from { opacity: 0; transform: translateY(20px) scale(0.98); }
  to { opacity: 1; transform: translateY(0) scale(1); }
}

.modal-header {
  padding: 20px;
  border-bottom: 1px solid var(--border-color);
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.modal-header h2 {
  font-size: 18px;
  font-weight: 600;
}

.modal-close-btn {
  background: none;
  border: none;
  color: var(--text-muted);
  cursor: pointer;
  border-radius: 50%;
  width: 32px;
  height: 32px;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all 0.2s;
}

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

.modal-body {
  padding: 24px;
  overflow-y: auto;
}

.modal-body h3 {
  font-size: 15px;
  font-weight: 600;
  margin-bottom: 12px;
  color: var(--accent);
}

.modal-body ul {
  list-style-type: none;
  margin-bottom: 24px;
}

.modal-body li {
  margin-bottom: 10px;
  font-size: 14px;
  line-height: 1.6;
  color: var(--text-muted);
  display: flex;
  align-items: flex-start;
}

.modal-body li::before {
  content: "•";
  color: var(--accent);
  font-weight: bold;
  display: inline-block;
  width: 1em;
  margin-left: -0.5em;
  flex-shrink: 0;
}

.modal-body strong {
  color: var(--text-main);
}

.shortcut-table {
  width: 100%;
  border-collapse: collapse;
  margin-top: 10px;
}

.shortcut-table th, .shortcut-table td {
  padding: 10px 12px;
  text-align: left;
  border-bottom: 1px solid var(--border-color);
  font-size: 13px;
}

.shortcut-table th {
  font-weight: 600;
  color: var(--text-muted);
}

.shortcut-table td {
  color: var(--text-muted);
}

.shortcut-table tr:last-child td {
  border-bottom: none;
}

kbd {
  background-color: var(--bg-element);
  border: 1px solid var(--border-color);
  border-radius: 4px;
  padding: 3px 6px;
  font-size: 11px;
  font-family: monospace;
  color: var(--accent);
  box-shadow: 0 1px 1px rgba(0,0,0,0.4);
}

/* Responsiveness moved to the end of the stylesheet to prevent global style overrides */

/* Toggle Switch Styling */
.toggle-wrapper {
  background-color: var(--bg-element);
  border: 1px solid var(--border-color);
  padding: 12px;
  border-radius: 8px;
}

.toggle-container {
  display: flex;
  align-items: center;
  gap: 10px;
  cursor: pointer;
  font-size: 14px;
  font-weight: 500;
  color: var(--text-main);
  user-select: none;
}

.toggle-container input[type="checkbox"] {
  width: 18px;
  height: 18px;
  accent-color: var(--accent);
  cursor: pointer;
}

/* Borderless Node Styling */
.mindmap-node.borderless {
  background-color: transparent !important;
  border-color: transparent !important;
  box-shadow: none !important;
  filter: none !important;
}

/* Borderless active/selected state */
.mindmap-node.borderless.active {
  border-color: rgba(137, 180, 250, 0.4) !important;
  border-style: dashed !important;
  border-width: 2px !important;
  box-shadow: 0 0 12px rgba(137, 180, 250, 0.3) !important;
}

.mindmap-node.borderless.editing {
  border-color: var(--accent) !important;
  border-style: solid !important;
  background-color: var(--bg-element) !important;
}

/* Sidebar Text Area Editor styling */
.node-text-input {
  width: 100%;
  background-color: var(--bg-base);
  border: 1px solid var(--border-color);
  border-radius: 8px;
  color: var(--text-main);
  padding: 10px 12px;
  font-family: var(--font-family);
  font-size: 14px;
  resize: none;
  outline: none;
  transition: border-color 0.2s, box-shadow 0.2s;
  box-shadow: var(--shadow-sm);
}

.node-text-input:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 2px rgba(137, 180, 250, 0.2);
}

.node-text-input:disabled {
  background-color: rgba(0, 0, 0, 0.2);
  border-color: transparent;
  color: var(--text-muted);
  text-align: center;
  cursor: not-allowed;
  box-shadow: none;
}

/* Responsiveness */
@media (max-width: 768px) {
  /* Header adjustments */
  .app-header {
    padding: 0 8px;
    gap: 4px;
    min-width: 0;
    overflow: hidden;
  }

  .header-logo {
    flex-shrink: 0;
    min-width: 0;
  }

  .header-logo h1 {
    display: none;
  }

  .header-logo .logo-icon {
    font-size: 24px;
  }

  .header-actions {
    flex: 1;
    min-width: 0;
    justify-content: flex-end;
    overflow-x: auto;
    overflow-y: hidden;
    -webkit-overflow-scrolling: touch;
    scrollbar-width: none;
    gap: 4px;
    padding-bottom: 2px;
  }

  .header-actions::-webkit-scrollbar {
    display: none;
  }

  .icon-btn {
    padding: 8px;
    flex-shrink: 0;
  }
  
  .btn-text {
    display: none; /* Hide button text on mobile, icons only */
  }
  
  .divider {
    display: none;
    margin: 0 2px;
  }
  
  /* Sidebar adjustments for mobile */
  .property-sidebar {
    width: 100%;
    left: 0;
    right: auto;
    height: 45vh;
    height: 45dvh;
    bottom: 0;
    top: auto;
    border-left: none;
    border-top: 1px solid var(--border-color);
    transform: translateY(100%);
    overflow: hidden;
  }
  
  .property-sidebar.open {
    transform: translateY(0);
  }
  
  .sidebar-content {
    display: flex;
    flex-direction: column;
    overflow-x: hidden;
    overflow-y: auto;
    gap: 16px;
    padding: 16px;
  }
  
  .node-preview-container {
    display: none; /* Hide node preview on mobile to save space */
  }
  
  .setting-group {
    flex: 1;
    margin-bottom: 0;
    min-width: 140px;
  }
  
  .btn-grid {
    flex-direction: row;
    flex-wrap: wrap;
  }
  
  .action-btn {
    padding: 8px;
    font-size: 12px;
    flex: 1;
    min-width: 90px;
  }
  
  .preset-colors {
    grid-template-columns: repeat(4, 1fr);
    min-width: 0;
  }
  
  /* Adjust canvas height when sidebar open on mobile */
  .app-workspace {
    flex-direction: column;
  }

  /* Prevent Safari input focus auto-zoom by forcing >= 16px font-size */
  .node-text-input {
    font-size: 16px !important;
  }
  .mindmap-node.editing {
    font-size: 16px !important;
  }
}

/* Apple WebKit (iOS + macOS): CSS transform on SVG is driven from script.js */
html.ios-browser #mindmap-svg,
html.apple-webkit #mindmap-svg {
  will-change: transform;
}

/* Apple WebKit: avoid stroke transition glitches; extra foreignObject height pad from script.js */
html.apple-webkit .connection-path {
  transition: none;
}

html.apple-webkit .mindmap-node-wrapper {
  overflow: visible !important;
}

html.apple-webkit .mindmap-node .node-toggle-btn {
  flex-shrink: 0;
  pointer-events: all;
}

html.apple-webkit #toggles-group {
  pointer-events: none;
}

html.apple-webkit #toggles-group .node-toggle-svg {
  pointer-events: all;
}

/* Drag and Drop Styles */
.mindmap-node.drop-target.drop-child {
  border-style: dashed !important;
  border-color: var(--accent) !important;
  border-width: 2px !important;
  background-color: rgba(137, 180, 250, 0.15) !important;
  box-shadow: 0 0 16px rgba(137, 180, 250, 0.4) !important;
  transform: scale(1.05) !important;
}

.mindmap-node.drop-target.drop-above {
  transform: scale(1.02) !important;
}

.mindmap-node.drop-target.drop-above::before {
  content: '';
  position: absolute;
  left: -10px;
  right: -10px;
  top: -8px;
  height: 4px;
  background-color: var(--accent) !important;
  border-radius: 2px;
  z-index: 9999;
  box-shadow: 0 0 8px var(--accent);
}

.mindmap-node.drop-target.drop-below {
  transform: scale(1.02) !important;
}

.mindmap-node.drop-target.drop-below::after {
  content: '';
  position: absolute;
  left: -10px;
  right: -10px;
  bottom: -8px;
  height: 4px;
  background-color: var(--accent) !important;
  border-radius: 2px;
  z-index: 9999;
  box-shadow: 0 0 8px var(--accent);
}

.mindmap-node-wrapper.dragging {
  opacity: 0.6;
  filter: drop-shadow(0 12px 24px rgba(0, 0, 0, 0.5));
  cursor: grabbing !important;
}

.mindmap-node-wrapper.dragging .mindmap-node {
  cursor: grabbing !important;
  transform: scale(1.03);
}

/* Version styling in modal */
.app-version {
  font-size: 12px;
  font-weight: 500;
  color: var(--text-muted);
  background-color: var(--bg-element);
  border: 1px solid var(--border-color);
  padding: 2px 6px;
  border-radius: 4px;
  margin-left: 8px;
  vertical-align: middle;
}

/* Context Menu Styling */
.context-menu {
  display: none;
  position: fixed;
  background-color: rgba(21, 21, 28, 0.95);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border: 1px solid var(--border-color);
  border-radius: 8px;
  box-shadow: var(--shadow-lg);
  min-width: 180px;
  z-index: 500;
  padding: 4px 0;
  animation: context-menu-fade 0.15s ease-out;
}

@keyframes context-menu-fade {
  from { opacity: 0; transform: scale(0.95); }
  to { opacity: 1; transform: scale(1); }
}

.context-menu-item {
  background: none;
  border: none;
  color: var(--text-main);
  width: 100%;
  padding: 8px 16px;
  text-align: left;
  font-family: var(--font-family);
  font-size: 13px;
  font-weight: 500;
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: 8px;
  transition: background-color 0.15s ease;
}

.context-menu-item span {
  font-size: 18px;
  color: var(--text-muted);
}

.context-menu-item:hover {
  background-color: var(--bg-element);
  color: var(--text-main);
}

.context-menu-item:hover span {
  color: var(--accent);
}

.context-menu-item.danger {
  color: var(--danger);
}

.context-menu-item.danger span {
  color: var(--danger);
  opacity: 0.8;
}

.context-menu-item.danger:hover {
  background-color: rgba(243, 139, 168, 0.1);
}

.context-menu-divider {
  height: 1px;
  background-color: var(--border-color);
  margin: 4px 0;
}

/* License Modal Styles */
.license-box {
  background-color: var(--bg-element);
  border: 1px solid var(--border-color);
  border-radius: 8px;
  padding: 12px;
  max-height: 180px;
  overflow-y: auto;
  margin-top: 8px;
}

.license-box pre {
  margin: 0;
  font-family: 'Courier New', Courier, monospace;
  font-size: 11px;
  line-height: 1.5;
  color: var(--text-muted);
  white-space: pre-wrap;
}

.text-link-btn:hover {
  background-color: var(--bg-element) !important;
  color: var(--text-main) !important;
}

/* Accordion Styles */
.accordion {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.accordion-item {
  border: 1px solid var(--border-color);
  border-radius: 8px;
  overflow: hidden;
  background-color: var(--bg-surface);
}

.accordion-header {
  width: 100%;
  padding: 12px 16px;
  background: none;
  border: none;
  display: flex;
  justify-content: space-between;
  align-items: center;
  color: var(--text-main);
  font-size: 13px;
  font-weight: 500;
  cursor: pointer;
  text-align: left;
  transition: background-color 0.2s;
}

.accordion-header:hover {
  background-color: var(--bg-element);
}

.accordion-icon {
  font-size: 18px;
  transition: transform 0.2s ease;
  color: var(--text-muted);
}

.accordion-item.active .accordion-icon {
  transform: rotate(180deg);
}

.accordion-content {
  display: none;
  padding: 0 16px 16px 16px;
  background-color: var(--bg-surface);
  border-top: 1px dashed var(--border-color);
}

.accordion-item.active .accordion-content {
  display: block;
}

/* Toggle Button for Folding Nodes */
.node-toggle-btn {
  position: absolute;
  top: 50%;
  transform: translateY(-50%);
  width: 20px;
  height: 20px;
  border-radius: 50%;
  background-color: var(--bg-surface);
  border: 1.5px solid var(--accent);
  color: var(--text-main);
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  z-index: 10;
  padding: 0;
  transition: all 0.2s cubic-bezier(0.16, 1, 0.3, 1);
  box-shadow: var(--shadow-sm);
}

.node-toggle-btn:hover {
  background-color: var(--accent);
  color: var(--bg-surface);
  transform: translateY(-50%) scale(1.1);
}

.node-toggle-btn.dir-right {
  right: -10px;
}

.node-toggle-btn.dir-left {
  left: -10px;
}

.node-toggle-btn span {
  font-size: 14px;
}

/* SVG Toggle Button for Folding Nodes */
.node-toggle-svg circle {
  transition: fill 0.2s cubic-bezier(0.16, 1, 0.3, 1), stroke 0.2s cubic-bezier(0.16, 1, 0.3, 1);
}

.node-toggle-svg path {
  transition: stroke 0.2s cubic-bezier(0.16, 1, 0.3, 1);
}

.node-toggle-svg:hover circle {
  fill: var(--accent);
  stroke: var(--accent);
}

.node-toggle-svg:hover path {
  stroke: var(--bg-surface);
}

/* Toast Notification Style */
.toast-notification {
  position: fixed;
  bottom: 32px;
  left: 50%;
  transform: translateX(-50%) translateY(20px);
  background-color: rgba(29, 31, 43, 0.9);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border: 1px solid var(--border-color);
  color: var(--text-main);
  padding: 10px 20px;
  border-radius: 8px;
  font-family: var(--font-family);
  font-size: 13px;
  font-weight: 500;
  z-index: 1000;
  opacity: 0;
  pointer-events: none;
  box-shadow: var(--shadow-lg);
  transition: all 0.35s cubic-bezier(0.16, 1, 0.3, 1);
}

.toast-notification.show {
  opacity: 1;
  transform: translateX(-50%) translateY(0);
}

/* Current File Name Style */
.current-file-name {
  font-size: 12px;
  color: var(--text-muted);
  font-weight: 400;
  margin-left: 10px;
  padding: 4px 8px;
  background-color: var(--bg-element);
  border-radius: 4px;
  border: 1px solid var(--border-color);
  max-width: 200px;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  vertical-align: middle;
  display: none;
}