/* ==========================================================================
   AsciiFlow - Clean Nordic Stylesheet
   Minimal, Calm, Professional, Spacious, Modern, Functional
   ========================================================================== */

:root {
  /* Nordic Light Palette */
  --bg-app: #f8fafc;
  --bg-surface: #ffffff;
  --bg-surface-elevated: #ffffff;
  --bg-canvas: #fdfdfd;
  --bg-toolbar: #ffffff;
  --bg-hover: #f1f5f9;
  --bg-active: #e2e8f0;
  --bg-input: #ffffff;
  
  --border-subtle: #e2e8f0;
  --border-medium: #cbd5e1;
  --border-focus: #3b82f6;

  --text-primary: #0f172a;
  --text-secondary: #475569;
  --text-muted: #94a3b8;
  --text-inverse: #ffffff;

  /* Nordic Accents */
  --accent-primary: #2563eb;
  --accent-primary-hover: #1d4ed8;
  --accent-subtle: #eff6ff;
  --accent-border: #bfdbfe;
  
  --nordic-frost: #0284c7;
  --nordic-moss: #10b981;
  --nordic-amber: #f59e0b;
  --nordic-rose: #ef4444;

  /* Canvas Character Grid */
  --grid-dot: #cbd5e1;
  --grid-line: #f1f5f9;
  --shape-fill: transparent;
  --shape-border-color: #0f172a;
  --shape-text-color: #0f172a;
  --selection-color: #2563eb;
  --selection-fill: rgba(37, 99, 235, 0.08);
  --anchor-color: #0284c7;
  --anchor-hover: #0369a1;

  /* Monospace Font Stack */
  --font-mono: "SFMono-Regular", "Cascadia Code", "Roboto Mono", "Consolas", "Liberation Mono", Menlo, Courier, monospace;
  --font-ui: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;

  /* Shadows */
  --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.04);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.06), 0 2px 4px -2px rgba(0, 0, 0, 0.04);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.08), 0 4px 6px -4px rgba(0, 0, 0, 0.03);

  /* Transitions */
  --transition-fast: 0.15s ease;
  --transition-normal: 0.25s ease;
}

[data-theme="dark"] {
  /* Nordic Dark Palette (Charcoal, Night Sky & Frost) */
  --bg-app: #090d16;
  --bg-surface: #0f172a;
  --bg-surface-elevated: #1e293b;
  --bg-canvas: #090d16;
  --bg-toolbar: #0f172a;
  --bg-hover: #1e293b;
  --bg-active: #334155;
  --bg-input: #1e293b;

  --border-subtle: #1e293b;
  --border-medium: #334155;
  --border-focus: #60a5fa;

  --text-primary: #f8fafc;
  --text-secondary: #cbd5e1;
  --text-muted: #64748b;
  --text-inverse: #0f172a;

  /* Nordic Dark Accents */
  --accent-primary: #3b82f6;
  --accent-primary-hover: #60a5fa;
  --accent-subtle: rgba(59, 130, 246, 0.15);
  --accent-border: #2563eb;

  --nordic-frost: #38bdf8;
  --nordic-moss: #34d399;
  --nordic-amber: #fbbf24;
  --nordic-rose: #f87171;

  /* Canvas Character Grid */
  --grid-dot: #1e293b;
  --grid-line: #141e33;
  --shape-fill: transparent;
  --shape-border-color: #f8fafc;
  --shape-text-color: #f8fafc;
  --selection-color: #60a5fa;
  --selection-fill: rgba(96, 165, 250, 0.12);
  --anchor-color: #38bdf8;
  --anchor-hover: #7dd3fc;

  --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.3);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.4), 0 2px 4px -2px rgba(0, 0, 0, 0.2);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.5), 0 4px 6px -4px rgba(0, 0, 0, 0.3);
}

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

html, body {
  width: 100%;
  height: 100%;
  overflow: hidden;
  font-family: var(--font-ui);
  font-size: 14px;
  line-height: 1.5;
  color: var(--text-primary);
  background-color: var(--bg-app);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

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

/* Top Navigation / Header */
.app-header {
  height: 52px;
  background-color: var(--bg-surface);
  border-bottom: 1px solid var(--border-subtle);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 16px;
  z-index: 40;
  user-select: none;
  flex-shrink: 0;
}

.header-left, .header-center, .header-right {
  display: flex;
  align-items: center;
  gap: 8px;
}

.brand {
  display: flex;
  align-items: center;
  gap: 8px;
  text-decoration: none;
  color: var(--text-primary);
  font-weight: 600;
  font-size: 16px;
  letter-spacing: -0.02em;
  margin-right: 12px;
}

.brand-icon {
  font-family: var(--font-mono);
  font-size: 14px;
  font-weight: 700;
  background: var(--accent-subtle);
  color: var(--accent-primary);
  border: 1px solid var(--accent-border);
  padding: 2px 6px;
  border-radius: 4px;
  line-height: 1;
}

.header-divider {
  width: 1px;
  height: 22px;
  background-color: var(--border-subtle);
  margin: 0 4px;
}

/* Button & Tool Styles */
.btn-nordic {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  padding: 6px 12px;
  font-size: 13px;
  font-weight: 500;
  border-radius: 6px;
  border: 1px solid var(--border-medium);
  background-color: var(--bg-surface);
  color: var(--text-primary);
  cursor: pointer;
  transition: all var(--transition-fast);
  white-space: nowrap;
}

.btn-nordic:hover {
  background-color: var(--bg-hover);
  border-color: var(--border-focus);
}

.btn-nordic:active {
  background-color: var(--bg-active);
}

.btn-nordic.btn-primary-nordic {
  background-color: var(--accent-primary);
  border-color: var(--accent-primary);
  color: #ffffff;
  font-weight: 600;
  box-shadow: 0 1px 3px rgba(37, 99, 235, 0.25);
}

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

.btn-icon-nordic {
  width: 34px;
  height: 34px;
  padding: 0;
  border-radius: 6px;
  border: 1px solid transparent;
  background: transparent;
  color: var(--text-secondary);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-size: 16px;
  cursor: pointer;
  transition: all var(--transition-fast);
}

.btn-icon-nordic:hover {
  background-color: var(--bg-hover);
  color: var(--text-primary);
  border-color: var(--border-subtle);
}

.btn-icon-nordic:active {
  background-color: var(--bg-active);
}

.btn-icon-nordic:disabled, .btn-nordic:disabled {
  opacity: 0.4;
  cursor: not-allowed;
  pointer-events: none;
}

.btn-icon-nordic.active {
  background-color: var(--accent-subtle);
  color: var(--accent-primary);
  border-color: var(--accent-border);
}

/* Mode pill switch */
.mode-toggle-group {
  display: flex;
  background-color: var(--bg-hover);
  padding: 2px;
  border-radius: 6px;
  border: 1px solid var(--border-subtle);
}

.mode-btn {
  padding: 4px 10px;
  font-size: 12px;
  font-weight: 500;
  border: none;
  background: transparent;
  color: var(--text-secondary);
  border-radius: 4px;
  cursor: pointer;
  transition: all var(--transition-fast);
}

.mode-btn.active {
  background-color: var(--bg-surface);
  color: var(--text-primary);
  box-shadow: var(--shadow-sm);
}

/* Main Workspace Area */
.app-workspace {
  flex: 1;
  display: flex;
  overflow: hidden;
  position: relative;
}

/* Left Toolbar */
.app-toolbar {
  width: 56px;
  background-color: var(--bg-toolbar);
  border-right: 1px solid var(--border-subtle);
  display: flex;
  flex-direction: column;
  align-items: center;
  padding: 10px 0;
  gap: 4px;
  z-index: 30;
  flex-shrink: 0;
  user-select: none;
  overflow-y: auto;
}

.toolbar-divider {
  width: 32px;
  height: 1px;
  background-color: var(--border-subtle);
  margin: 6px 0;
}

.tool-btn {
  width: 40px;
  height: 40px;
  border-radius: 6px;
  border: 1px solid transparent;
  background: transparent;
  color: var(--text-secondary);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  position: relative;
  transition: all var(--transition-fast);
  font-size: 17px;
}

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

.tool-btn.active {
  background-color: var(--accent-subtle);
  color: var(--accent-primary);
  border-color: var(--accent-border);
}

.tool-btn .tool-shortcut {
  position: absolute;
  bottom: 2px;
  right: 3px;
  font-size: 9px;
  font-family: var(--font-mono);
  opacity: 0.6;
}

/* Contextual Property Bar */
.property-bar {
  position: absolute;
  top: 12px;
  left: 72px;
  background-color: var(--bg-surface-elevated);
  border: 1px solid var(--border-subtle);
  border-radius: 8px;
  padding: 6px 12px;
  display: flex;
  align-items: center;
  gap: 12px;
  box-shadow: var(--shadow-md);
  z-index: 25;
  user-select: none;
  transition: opacity var(--transition-fast), transform var(--transition-fast);
}

.property-bar.hidden {
  opacity: 0;
  pointer-events: none;
  transform: translateY(-6px);
}

.prop-group {
  display: flex;
  align-items: center;
  gap: 6px;
}

.prop-label {
  font-size: 11px;
  color: var(--text-muted);
  text-transform: uppercase;
  font-weight: 600;
  letter-spacing: 0.04em;
}

.prop-select {
  padding: 4px 8px;
  font-size: 12px;
  border-radius: 4px;
  border: 1px solid var(--border-medium);
  background-color: var(--bg-surface);
  color: var(--text-primary);
  outline: none;
}

.prop-section {
  display: flex;
  align-items: center;
  gap: 8px;
}

.prop-section .btn-icon-nordic {
  width: 28px;
  height: 28px;
  font-size: 14px;
}

.prop-divider {
  width: 1px;
  height: 18px;
  background-color: var(--border-subtle);
}

/* Canvas Area */
.canvas-container {
  flex: 1;
  position: relative;
  overflow: hidden;
  background-color: var(--bg-canvas);
  cursor: default;
}

.canvas-container.tool-select {
  cursor: default;
}

.canvas-container.tool-pan {
  cursor: grab;
}

.canvas-container.tool-panning {
  cursor: grabbing !important;
}

.canvas-container.tool-draw {
  cursor: crosshair;
}

#editorCanvas {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  display: block;
}

/* In-place Text Editor Overlay */
#canvasTextEditor {
  position: absolute;
  display: none;
  font-family: var(--font-mono);
  font-size: 13px;
  line-height: 18px;
  background-color: var(--bg-surface);
  color: var(--text-primary);
  border: 1.5px solid var(--accent-primary);
  border-radius: 4px;
  padding: 4px 6px;
  margin: 0;
  outline: none;
  resize: none;
  z-index: 50;
  box-shadow: var(--shadow-md);
  white-space: pre;
  overflow: hidden;
}

/* Split-view ASCII Preview Panel */
.preview-panel {
  width: 380px;
  min-width: 220px;
  max-width: 80vw;
  background-color: var(--bg-surface);
  border-left: 1px solid var(--border-subtle);
  display: flex;
  flex-direction: column;
  z-index: 20;
  flex-shrink: 0;
  position: relative;
}

.preview-panel.resizing {
  transition: none !important;
  user-select: none;
}

.preview-panel.collapsed {
  width: 0 !important;
  min-width: 0 !important;
  border-left: none;
  overflow: hidden;
}

/* Draggable left edge resize handle */
.preview-resizer {
  position: absolute;
  left: -5px;
  top: 0;
  bottom: 0;
  width: 10px;
  cursor: col-resize;
  z-index: 60;
  background: transparent;
  transition: background var(--transition-fast);
}

.preview-resizer:hover, .preview-resizer.is-dragging {
  background-color: var(--accent-primary);
  opacity: 0.6;
}

.preview-header {
  height: 44px;
  padding: 0 14px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  border-bottom: 1px solid var(--border-subtle);
  user-select: none;
  flex-shrink: 0;
}

.preview-title {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 13px;
  font-weight: 600;
  color: var(--text-primary);
}

.preview-badge {
  font-size: 10px;
  font-family: var(--font-mono);
  padding: 2px 6px;
  border-radius: 4px;
  background-color: var(--bg-hover);
  color: var(--text-secondary);
  border: 1px solid var(--border-subtle);
}

.preview-content {
  flex: 1;
  overflow: auto;
  padding: 16px;
  background-color: var(--bg-app);
}

.preview-code-block {
  font-family: var(--font-mono);
  font-size: 12px;
  line-height: 1.4;
  white-space: pre;
  color: var(--text-primary);
  user-select: text;
  margin: 0;
  display: inline-block;
  min-width: 100%;
}

.preview-footer {
  height: 38px;
  padding: 0 14px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  border-top: 1px solid var(--border-subtle);
  background-color: var(--bg-surface);
  font-size: 11px;
  color: var(--text-muted);
}

/* Bottom Status Bar */
.app-statusbar {
  height: 28px;
  background-color: var(--bg-surface);
  border-top: 1px solid var(--border-subtle);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 14px;
  font-size: 11px;
  color: var(--text-secondary);
  user-select: none;
  flex-shrink: 0;
  z-index: 35;
}

.statusbar-left, .statusbar-center, .statusbar-right {
  display: flex;
  align-items: center;
  gap: 14px;
}

.status-item {
  display: flex;
  align-items: center;
  gap: 5px;
}

.status-mono {
  font-family: var(--font-mono);
  font-weight: 500;
  color: var(--text-primary);
}

.zoom-controls {
  display: flex;
  align-items: center;
  gap: 4px;
}

.btn-zoom {
  padding: 1px 6px;
  font-size: 11px;
  border: 1px solid var(--border-subtle);
  background: var(--bg-hover);
  color: var(--text-primary);
  border-radius: 3px;
  cursor: pointer;
}

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

/* Floating Quick Help / Canvas Tooltips */
.canvas-hint {
  position: absolute;
  bottom: 12px;
  left: 72px;
  background-color: var(--bg-surface-elevated);
  border: 1px solid var(--border-subtle);
  border-radius: 6px;
  padding: 4px 10px;
  font-size: 11px;
  color: var(--text-secondary);
  box-shadow: var(--shadow-sm);
  pointer-events: none;
  opacity: 0.85;
}

/* Modal styling overrides for Nordic feel */
.modal-nordic .modal-content {
  background-color: var(--bg-surface-elevated);
  border: 1px solid var(--border-medium);
  border-radius: 10px;
  box-shadow: var(--shadow-lg);
  color: var(--text-primary);
}

.modal-nordic .modal-header {
  border-bottom: 1px solid var(--border-subtle);
  padding: 14px 20px;
}

.modal-nordic .modal-title {
  font-size: 16px;
  font-weight: 600;
}

.modal-nordic .modal-footer {
  border-top: 1px solid var(--border-subtle);
  padding: 12px 20px;
}

.modal-nordic .btn-close {
  filter: var(--text-primary) == #f8fafc ? invert(1) : none;
}

/* Toast Styling */
.toast-nordic {
  background-color: var(--bg-surface-elevated) !important;
  color: var(--text-primary) !important;
  border: 1px solid var(--border-medium) !important;
  border-radius: 8px !important;
  box-shadow: var(--shadow-lg) !important;
}

.toast-nordic .toast-header {
  background-color: var(--bg-surface) !important;
  color: var(--text-primary) !important;
  border-bottom: 1px solid var(--border-subtle) !important;
}

/* Shortcuts grid */
.shortcut-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 6px 0;
  border-bottom: 1px dashed var(--border-subtle);
}

.shortcut-row:last-child {
  border-bottom: none;
}

.shortcut-key {
  font-family: var(--font-mono);
  background-color: var(--bg-hover);
  border: 1px solid var(--border-medium);
  border-radius: 4px;
  padding: 2px 6px;
  font-size: 11px;
  color: var(--text-primary);
}

/* Custom Scrollbars */
::-webkit-scrollbar {
  width: 8px;
  height: 8px;
}

::-webkit-scrollbar-track {
  background: transparent;
}

::-webkit-scrollbar-thumb {
  background: var(--border-medium);
  border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
  background: var(--text-muted);
}

/* Responsive adjustments */
@media (max-width: 840px) {
  .preview-panel {
    position: absolute;
    right: 0;
    top: 0;
    bottom: 0;
    height: 100%;
    box-shadow: -4px 0 12px rgba(0, 0, 0, 0.15);
  }
  .property-bar {
    left: 60px;
    right: 12px;
    flex-wrap: wrap;
  }
}