/* ==========================================================================
   AdeptWiz Diagram - Design System & Modern CSS Stylesheet
   ========================================================================== */

/* --- CSS VARIABLES & THEME DEFINITIONS --- */
:root {
  /* Dark Theme (Default) */
  --bg-primary: #0f172a;
  --bg-secondary: #1e293b;
  --bg-tertiary: #334155;
  --bg-surface: #1e293b;
  --bg-hover: #334155;
  --bg-active: #475569;

  --text-main: #f8fafc;
  --text-muted: #94a3b8;
  --text-subtle: #64748b;
  
  --accent-primary: #3b82f6;
  --accent-hover: #2563eb;
  --accent-glow: rgba(59, 130, 246, 0.35);
  
  --border-color: #334155;
  --border-subtle: #1e293b;
  
  --canvas-bg: #0b0f19;
  --grid-line-small: rgba(255, 255, 255, 0.05);
  --grid-line-large: rgba(255, 255, 255, 0.12);
  
  --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 -1px rgba(0, 0, 0, 0.2);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.5), 0 4px 6px -2px rgba(0, 0, 0, 0.3);

  --font-main: 'Inter', system-ui, -apple-system, sans-serif;
  --font-heading: 'Outfit', 'Inter', sans-serif;
  --font-mono: 'Fira Code', monospace;

  --danger-color: #ef4444;
  --success-color: #10b981;
  --warning-color: #f59e0b;

  --selection-color: #38bdf8;
  --handle-size: 8px;
}

[data-theme="light"] {
  --bg-primary: #f8fafc;
  --bg-secondary: #ffffff;
  --bg-tertiary: #f1f5f9;
  --bg-surface: #ffffff;
  --bg-hover: #e2e8f0;
  --bg-active: #cbd5e1;

  --text-main: #0f172a;
  --text-muted: #475569;
  --text-subtle: #94a3b8;
  
  --accent-primary: #2563eb;
  --accent-hover: #1d4ed8;
  --accent-glow: rgba(37, 99, 235, 0.2);
  
  --border-color: #e2e8f0;
  --border-subtle: #cbd5e1;
  
  --canvas-bg: #f8fafc;
  --grid-line-small: rgba(0, 0, 0, 0.04);
  --grid-line-large: rgba(0, 0, 0, 0.1);
  
  --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.08);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.12);

  --selection-color: #0284c7;
}

/* --- RESET & BASE --- */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html, body {
  width: 100vw;
  height: 100vh;
  overflow: hidden;
  font-family: var(--font-main);
  background-color: var(--bg-primary);
  color: var(--text-main);
  font-size: 13px;
  user-select: none;
}

/* --- APPLICATION LAYOUT --- */
.app-layout {
  display: grid;
  grid-template-rows: 44px 44px 1fr 26px;
  grid-template-columns: 1fr;
  grid-template-areas:
    "header"
    "toolbar"
    "workspace"
    "statusbar";
  width: 100vw;
  height: 100vh;
  overflow: hidden;
}

.app-workspace {
  grid-area: workspace;
  display: grid;
  grid-template-rows: 1fr;
  grid-template-columns: 240px 1fr 280px;
  grid-template-areas: "sidebar canvas inspector";
  gap: 0;
  width: 100%;
  height: 100%;
  min-width: 0;
  min-height: 0;
  overflow: hidden;
}

/* --- HEADER / NAVBAR --- */
.app-header {
  grid-area: header;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 12px;
  background-color: var(--bg-secondary);
  border-bottom: 1px solid var(--border-color);
  z-index: 100;
}

.brand {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-right: 12px;
}

.brand-logo {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 28px;
  height: 28px;
  background: linear-gradient(135deg, var(--accent-primary), #8b5cf6);
  border-radius: 6px;
  color: #ffffff;
  font-size: 15px;
  box-shadow: 0 2px 8px var(--accent-glow);
}

.brand-title {
  display: flex;
  align-items: center;
  gap: 4px;
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: 15px;
}

.brand-name { color: var(--text-main); }
.brand-sub { color: var(--accent-primary); }

.app-menubar {
  display: flex;
  align-items: center;
  gap: 2px;
}

.menu-item {
  position: relative;
}

.menu-btn {
  background: none;
  border: none;
  color: var(--text-muted);
  font-family: var(--font-main);
  font-size: 12px;
  font-weight: 500;
  padding: 5px 10px;
  border-radius: 4px;
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: 6px;
  transition: all 0.15s ease;
}

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

.menu-btn.highlight-btn {
  background: linear-gradient(135deg, rgba(59, 130, 246, 0.15), rgba(139, 92, 246, 0.15));
  color: var(--accent-primary);
  border: 1px solid rgba(59, 130, 246, 0.3);
}

.menu-btn.highlight-btn:hover {
  background: linear-gradient(135deg, rgba(59, 130, 246, 0.3), rgba(139, 92, 246, 0.3));
}

/* Dropdown Menus */
.dropdown-content {
  display: none;
  position: absolute;
  top: 100%;
  left: 0;
  min-width: 220px;
  background-color: var(--bg-surface);
  border: 1px solid var(--border-color);
  border-radius: 8px;
  box-shadow: var(--shadow-lg);
  padding: 6px 0;
  z-index: 1000;
}

.dropdown:hover .dropdown-content {
  display: block;
  animation: fadeIn 0.15s ease;
}

.dropdown-item {
  width: 100%;
  background: none;
  border: none;
  padding: 7px 14px;
  color: var(--text-main);
  font-size: 12px;
  font-family: var(--font-main);
  text-align: left;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
}

.dropdown-item i {
  width: 16px;
  text-align: center;
  color: var(--text-muted);
}

.dropdown-item:hover {
  background-color: var(--bg-hover);
  color: var(--accent-primary);
}

.dropdown-item:hover i {
  color: var(--accent-primary);
}

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

.shortcut {
  font-size: 10px;
  color: var(--text-subtle);
  background-color: var(--bg-tertiary);
  padding: 2px 5px;
  border-radius: 3px;
}

.document-title-wrapper {
  display: flex;
  align-items: center;
  gap: 8px;
  background-color: var(--bg-tertiary);
  padding: 3px 10px;
  border-radius: 6px;
  border: 1px solid var(--border-color);
}

#document-title {
  background: none;
  border: none;
  color: var(--text-main);
  font-family: var(--font-heading);
  font-weight: 600;
  font-size: 13px;
  width: 160px;
  outline: none;
}

#document-title:focus {
  border-bottom: 1px solid var(--accent-primary);
}

.save-status {
  font-size: 11px;
  color: var(--success-color);
  display: flex;
  align-items: center;
  gap: 4px;
}

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

/* --- MAIN TOOLBAR --- */
.app-toolbar {
  grid-area: toolbar;
  display: flex;
  align-items: center;
  padding: 0 12px;
  background-color: var(--bg-tertiary);
  border-bottom: 1px solid var(--border-color);
  gap: 8px;
  z-index: 90;
}

.toolbar-group {
  display: flex;
  align-items: center;
  gap: 4px;
}

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

.tool-btn {
  display: flex;
  align-items: center;
  gap: 6px;
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  color: var(--text-muted);
  padding: 5px 10px;
  border-radius: 6px;
  font-size: 12px;
  font-weight: 500;
  cursor: pointer;
  transition: all 0.15s ease;
}

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

.tool-btn.active {
  background-color: var(--accent-primary);
  color: #ffffff;
  border-color: var(--accent-hover);
  box-shadow: 0 2px 6px var(--accent-glow);
}

.tool-btn-sm {
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  color: var(--text-muted);
  width: 30px;
  height: 30px;
  border-radius: 6px;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: all 0.15s ease;
}

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

.zoom-controls {
  display: flex;
  align-items: center;
  gap: 6px;
}

.zoom-text {
  font-size: 11px;
  font-weight: 600;
  color: var(--text-main);
  min-width: 40px;
  text-align: center;
}

/* --- SIDEBAR SHAPES ACCORDION --- */
.sidebar-shapes {
  grid-area: sidebar;
  background-color: var(--bg-secondary);
  border-right: 1px solid var(--border-color);
  display: flex;
  flex-direction: column;
  height: 100%;
  min-height: 0;
  overflow: hidden;
}

.sidebar-search {
  padding: 10px;
  position: relative;
  border-bottom: 1px solid var(--border-color);
}

.sidebar-search input {
  width: 100%;
  background-color: var(--bg-tertiary);
  border: 1px solid var(--border-color);
  border-radius: 6px;
  padding: 6px 10px 6px 30px;
  color: var(--text-main);
  font-size: 12px;
  outline: none;
}

.sidebar-search input:focus {
  border-color: var(--accent-primary);
}

.search-icon {
  position: absolute;
  left: 18px;
  top: 50%;
  transform: translateY(-50%);
  color: var(--text-subtle);
  font-size: 12px;
}

.accordion-container {
  flex: 1;
  overflow-y: auto;
  padding: 6px;
}

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

.accordion-header {
  width: 100%;
  background: none;
  border: none;
  padding: 10px 12px;
  color: var(--text-main);
  font-family: var(--font-heading);
  font-weight: 600;
  font-size: 12px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  cursor: pointer;
  transition: background 0.15s ease;
}

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

.icon-category {
  color: var(--accent-primary);
  margin-right: 6px;
}

.accordion-arrow {
  font-size: 10px;
  transition: transform 0.2s ease;
}

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

.accordion-content {
  display: none;
  padding: 8px;
  border-top: 1px solid var(--border-color);
  background-color: var(--bg-primary);
}

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

.shapes-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 8px;
}

.shape-item {
  position: relative;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 8px 4px;
  background-color: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: 6px;
  cursor: grab;
  transition: all 0.15s ease;
}

.sidebar-library-actions {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 0 10px 8px 10px;
  border-bottom: 1px solid var(--border-color);
}

.custom-shape-delete {
  position: absolute;
  top: 2px;
  right: 2px;
  width: 16px;
  height: 16px;
  border-radius: 50%;
  background-color: rgba(239, 68, 68, 0.85);
  color: #ffffff;
  border: none;
  font-size: 10px;
  line-height: 16px;
  text-align: center;
  cursor: pointer;
  opacity: 0;
  transition: opacity 0.15s ease;
  padding: 0;
}

.shape-item:hover .custom-shape-delete {
  opacity: 1;
}

.shape-item:hover {
  background-color: var(--bg-hover);
  border-color: var(--accent-primary);
  transform: translateY(-2px);
  box-shadow: var(--shadow-sm);
}

.shape-item svg {
  width: 32px;
  height: 32px;
  margin-bottom: 4px;
}

.shape-item span {
  font-size: 10px;
  color: var(--text-muted);
  text-align: center;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  max-width: 100%;
}

/* --- CANVAS VIEWPORT --- */
.canvas-viewport {
  grid-area: canvas;
  position: relative;
  width: 100%;
  height: 100%;
  min-width: 0;
  min-height: 0;
  background-color: var(--canvas-bg);
  overflow: hidden;
  cursor: default;
}

.diagram-svg {
  width: 100%;
  height: 100%;
  display: block;
}

.marker-fill {
  fill: var(--text-muted);
}

.grid-line-subtle { stroke: var(--grid-line-small); }
.grid-line-strong { stroke: var(--grid-line-large); }

/* --- RULERS (DOCKED ALONG TOP & LEFT OF DESIGNER) --- */
.canvas-viewport.with-rulers {
  display: grid;
  grid-template-columns: 28px 1fr;
  grid-template-rows: 28px 1fr;
  grid-template-areas:
    "ruler-corner ruler-h"
    "ruler-v diagram-svg";
}

.canvas-viewport:not(.with-rulers) {
  display: grid;
  grid-template-columns: 1fr;
  grid-template-rows: 1fr;
  grid-template-areas: "diagram-svg";
}

.ruler-corner {
  grid-area: ruler-corner;
  width: 28px;
  height: 28px;
  background-color: var(--bg-secondary);
  border-right: 1px solid var(--border-color);
  border-bottom: 1px solid var(--border-color);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 11px;
  color: var(--accent-primary);
  z-index: 55;
  cursor: pointer;
}

.ruler-corner:hover {
  background-color: var(--bg-hover);
}

.canvas-ruler {
  background-color: var(--bg-secondary);
  z-index: 50;
  display: block;
}

.ruler-h {
  grid-area: ruler-h;
  width: 100%;
  height: 28px;
  border-bottom: 1px solid var(--border-color);
  cursor: row-resize;
}

.ruler-v {
  grid-area: ruler-v;
  width: 28px;
  height: 100%;
  border-right: 1px solid var(--border-color);
  cursor: col-resize;
}

.ruler-corner.hidden,
.canvas-ruler.hidden {
  display: none !important;
}

/* --- PAGE SHEET & GUIDE LINES --- */
.page-sheet-bg {
  fill: rgba(30, 41, 59, 0.32);
  stroke: #475569;
  stroke-width: 1.5px;
}

[data-theme="light"] .page-sheet-bg {
  fill: rgba(255, 255, 255, 0.85);
  stroke: #94a3b8;
}

.page-margin-guide {
  fill: none;
  stroke: rgba(56, 189, 248, 0.45);
  stroke-width: 1px;
  stroke-dasharray: 5, 5;
  pointer-events: none;
}

.page-center-guide {
  stroke: rgba(168, 85, 247, 0.45);
  stroke-width: 1px;
  stroke-dasharray: 8, 4, 2, 4;
  pointer-events: none;
}

.user-guide-line {
  stroke: #06b6d4;
  stroke-width: 1.5px;
  stroke-dasharray: 6, 4;
  cursor: pointer;
  pointer-events: stroke;
}

.user-guide-line:hover {
  stroke: #22d3ee;
  stroke-width: 3px;
}

.smart-guide-line {
  stroke: #f43f5e;
  stroke-width: 1.4px;
  stroke-dasharray: 4, 3;
  pointer-events: none;
}

.manual-guides-list {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.manual-guide-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 4px 8px;
  background-color: var(--bg-tertiary);
  border: 1px solid var(--border-color);
  border-radius: 5px;
  font-size: 11px;
  font-family: var(--font-mono);
}

.manual-guide-item button {
  background: none;
  border: none;
  color: var(--danger-color);
  cursor: pointer;
  font-size: 12px;
  padding: 0 4px;
}

/* --- INTERACTIVE CANVAS SCROLLBARS --- */
.canvas-scrollbar {
  position: absolute;
  background-color: rgba(15, 23, 42, 0.45);
  z-index: 60;
  border-radius: 6px;
  transition: background-color 0.15s ease;
}

[data-theme="light"] .canvas-scrollbar {
  background-color: rgba(203, 213, 225, 0.55);
}

.canvas-scrollbar:hover {
  background-color: rgba(30, 41, 59, 0.75);
}

.scroll-h {
  bottom: 4px;
  left: 30px;
  right: 18px;
  height: 10px;
}

.scroll-v {
  top: 30px;
  right: 4px;
  bottom: 18px;
  width: 10px;
}

.scroll-thumb {
  position: absolute;
  background-color: var(--text-subtle);
  border-radius: 5px;
  cursor: grab;
  transition: background-color 0.15s ease;
}

.scroll-thumb:hover,
.scroll-thumb:active {
  background-color: var(--accent-primary);
  cursor: grabbing;
}

.scroll-h .scroll-thumb {
  top: 1px;
  height: 8px;
  min-width: 36px;
}

.scroll-v .scroll-thumb {
  left: 1px;
  width: 8px;
  min-height: 36px;
}

.drawing-canvas {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  pointer-events: auto;
  z-index: 40;
}

.drawing-canvas.hidden {
  display: none;
}

/* --- FLOATING SELECTION BAR --- */
.floating-bar {
  position: absolute;
  top: 34px;
  left: 50%;
  transform: translateX(-50%);
  background-color: var(--bg-surface);
  border: 1px solid var(--border-color);
  border-radius: 8px;
  padding: 4px 8px;
  display: flex;
  gap: 6px;
  box-shadow: var(--shadow-lg);
  z-index: 200;
}

.floating-bar.hidden {
  display: none;
}

.floating-bar button {
  background: none;
  border: none;
  color: var(--text-muted);
  padding: 6px 8px;
  border-radius: 4px;
  cursor: pointer;
  font-size: 13px;
}

.floating-bar button:hover {
  background-color: var(--bg-hover);
  color: var(--text-main);
}

/* --- CANVAS NAVIGATOR / MINI-MAP --- */
.canvas-navigator {
  position: absolute;
  bottom: 20px;
  right: 20px;
  width: 160px;
  background-color: var(--bg-surface);
  border: 1px solid var(--border-color);
  border-radius: 8px;
  box-shadow: var(--shadow-lg);
  overflow: hidden;
  z-index: 150;
}

.nav-header {
  padding: 6px 10px;
  background-color: var(--bg-tertiary);
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 11px;
  font-weight: 600;
}

.nav-body {
  height: 100px;
  position: relative;
  background-color: var(--canvas-bg);
}

#nav-svg-preview {
  width: 100%;
  height: 100%;
}

#nav-viewport-box {
  position: absolute;
  border: 1.5px solid var(--accent-primary);
  background-color: rgba(59, 130, 246, 0.15);
  pointer-events: none;
}

/* --- RIGHT INSPECTOR SIDEBAR --- */
.sidebar-inspector {
  grid-area: inspector;
  background-color: var(--bg-secondary);
  border-left: 1px solid var(--border-color);
  display: flex;
  flex-direction: column;
  height: 100%;
  min-height: 0;
  overflow: hidden;
}

.inspector-tabs {
  display: flex;
  border-bottom: 1px solid var(--border-color);
  background-color: var(--bg-tertiary);
}

.tab-btn {
  flex: 1;
  background: none;
  border: none;
  padding: 10px 4px;
  color: var(--text-muted);
  font-family: var(--font-heading);
  font-size: 11px;
  font-weight: 600;
  cursor: pointer;
  border-bottom: 2px solid transparent;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  transition: all 0.15s ease;
}

.tab-btn:hover {
  color: var(--text-main);
}

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

.inspector-content {
  flex: 1;
  overflow-y: auto;
  padding: 12px;
}

.tab-pane {
  display: none;
}

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

.inspector-section {
  margin-bottom: 16px;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--border-color);
}

.section-title {
  font-family: var(--font-heading);
  font-size: 11px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  color: var(--text-subtle);
  margin-bottom: 10px;
}

.control-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 10px;
  gap: 8px;
}

.control-row.hidden {
  display: none !important;
}

.control-row label {
  color: var(--text-muted);
  font-size: 12px;
}

.color-picker-wrapper {
  display: flex;
  align-items: center;
  gap: 8px;
  background-color: var(--bg-tertiary);
  padding: 3px 8px;
  border-radius: 6px;
  border: 1px solid var(--border-color);
}

.color-picker-wrapper input[type="color"] {
  -webkit-appearance: none;
  border: none;
  width: 20px;
  height: 20px;
  border-radius: 4px;
  cursor: pointer;
  background: none;
}

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

.color-picker-wrapper input[type="color"]::-webkit-color-swatch {
  border: 1px solid var(--border-color);
  border-radius: 4px;
}

.hex-code {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--text-main);
}

.num-input, .select-input {
  background-color: var(--bg-tertiary);
  border: 1px solid var(--border-color);
  border-radius: 6px;
  color: var(--text-main);
  padding: 5px 8px;
  font-size: 12px;
  outline: none;
}

.num-input { width: 64px; }
.select-input { width: 120px; }

.num-input:focus, .select-input:focus {
  border-color: var(--accent-primary);
}

.text-area-input {
  width: 100%;
  background-color: var(--bg-tertiary);
  border: 1px solid var(--border-color);
  border-radius: 6px;
  color: var(--text-main);
  padding: 6px;
  font-size: 12px;
  font-family: var(--font-main);
  outline: none;
  resize: vertical;
}

.btn-group-row {
  display: flex;
  gap: 6px;
  margin-bottom: 8px;
}

.toggle-btn {
  flex: 1;
  background-color: var(--bg-tertiary);
  border: 1px solid var(--border-color);
  color: var(--text-muted);
  padding: 6px;
  border-radius: 6px;
  cursor: pointer;
  font-size: 12px;
}

.toggle-btn:hover { background-color: var(--bg-hover); color: var(--text-main); }
.toggle-btn.active { background-color: var(--accent-primary); color: #ffffff; }

.btn-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 6px;
}

/* --- FOOTER STATUSBAR --- */
.app-statusbar {
  grid-area: statusbar;
  background-color: var(--bg-secondary);
  border-top: 1px solid var(--border-color);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 12px;
  font-size: 11px;
  color: var(--text-subtle);
  z-index: 100;
}

.status-left, .status-right {
  display: flex;
  align-items: center;
  gap: 10px;
}

.status-divider {
  width: 1px;
  height: 12px;
  background-color: var(--border-color);
}

/* --- BUTTON UTILITIES --- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  padding: 6px 12px;
  border-radius: 6px;
  font-family: var(--font-main);
  font-size: 12px;
  font-weight: 500;
  cursor: pointer;
  border: none;
  transition: all 0.15s ease;
}

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

.btn-secondary { background-color: var(--bg-tertiary); color: var(--text-main); border: 1px solid var(--border-color); }
.btn-secondary:hover { background-color: var(--bg-hover); }

.btn-sm { padding: 4px 8px; font-size: 11px; }

.btn-icon {
  background: var(--bg-tertiary);
  border: 1px solid var(--border-color);
  color: var(--text-main);
  width: 30px;
  height: 30px;
  border-radius: 6px;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
}

.btn-icon-xs {
  background: none;
  border: none;
  color: var(--text-muted);
  cursor: pointer;
}

.text-danger { color: var(--danger-color) !important; }
.text-xs { font-size: 10px; }

/* --- MODALS & DIALOGS --- */
.modal {
  position: fixed;
  top: 0;
  left: 0;
  width: 100vw;
  height: 100vh;
  background-color: rgba(0, 0, 0, 0.65);
  backdrop-filter: blur(4px);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 2000;
}

.modal.hidden { display: none; }

.modal-content {
  background-color: var(--bg-surface);
  border: 1px solid var(--border-color);
  border-radius: 12px;
  width: 480px;
  max-width: 90vw;
  box-shadow: var(--shadow-lg);
  overflow: hidden;
  animation: modalPop 0.2s cubic-bezier(0.16, 1, 0.3, 1);
}

.modal-lg { width: 800px; }

.modal-header {
  padding: 14px 18px;
  background-color: var(--bg-tertiary);
  border-bottom: 1px solid var(--border-color);
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.modal-header h3 {
  font-family: var(--font-heading);
  font-size: 15px;
  font-weight: 600;
  display: flex;
  align-items: center;
  gap: 8px;
}

.modal-close {
  background: none;
  border: none;
  font-size: 20px;
  color: var(--text-muted);
  cursor: pointer;
}

.modal-close:hover { color: var(--text-main); }

.modal-body { padding: 18px; }

.file-dropzone {
  border: 2px dashed var(--border-color);
  border-radius: 10px;
  padding: 30px 20px;
  text-align: center;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 10px;
  transition: border-color 0.2s ease;
}

.file-dropzone:hover { border-color: var(--accent-primary); }

.drop-icon {
  font-size: 36px;
  color: var(--accent-primary);
}

/* Templates Grid */
.templates-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
  gap: 14px;
}

.template-card {
  background-color: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: 8px;
  padding: 12px;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.template-preview {
  height: 90px;
  border-radius: 6px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 32px;
  color: #ffffff;
}

.t-uml { background: linear-gradient(135deg, #7c3aed, #4c1d95); }
.t-er { background: linear-gradient(135deg, #0284c7, #075985); }
.t-flow { background: linear-gradient(135deg, #059669, #047857); }
.t-cloud { background: linear-gradient(135deg, #0284c7, #2563eb); }
.t-sketch { background: linear-gradient(135deg, #d97706, #b45309); }

.template-card h4 { font-family: var(--font-heading); font-size: 13px; }
.template-card p { font-size: 11px; color: var(--text-muted); line-height: 1.4; flex: 1; }

/* Shortcuts Table */
.shortcuts-table { width: 100%; border-collapse: collapse; }
.shortcuts-table td { padding: 8px; border-bottom: 1px solid var(--border-color); font-size: 12px; }
.shortcuts-table kbd { background-color: var(--bg-tertiary); border: 1px solid var(--border-color); padding: 2px 6px; border-radius: 4px; font-family: var(--font-mono); font-size: 10px; }

/* --- TOAST NOTIFICATIONS --- */
.toast-container {
  position: fixed;
  bottom: 36px;
  right: 20px;
  display: flex;
  flex-direction: column;
  gap: 8px;
  z-index: 3000;
}

.toast {
  background-color: var(--bg-surface);
  border: 1px solid var(--border-color);
  border-left: 4px solid var(--accent-primary);
  border-radius: 6px;
  padding: 10px 14px;
  box-shadow: var(--shadow-lg);
  color: var(--text-main);
  font-size: 12px;
  display: flex;
  align-items: center;
  gap: 10px;
  animation: slideInRight 0.25s ease;
}

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

/* --- SVG SHAPE SELECTION STYLES --- */
.svg-node { cursor: move; }
.svg-node:hover .node-border { stroke-width: 2.5px; }

.selection-box {
  fill: none;
  stroke: var(--selection-color);
  stroke-width: 1.5px;
  stroke-dasharray: 4,4;
  pointer-events: none;
}

.resize-handle {
  fill: var(--bg-secondary);
  stroke: var(--selection-color);
  stroke-width: 2px;
  cursor: pointer;
}

.rotation-handle {
  fill: var(--selection-color);
  stroke: #ffffff;
  stroke-width: 1.5px;
  cursor: grab;
}

.rotation-line {
  stroke: var(--selection-color);
  stroke-width: 1px;
  stroke-dasharray: 2,2;
}

.anchor-point {
  fill: #38bdf8;
  stroke: #ffffff;
  stroke-width: 1.5px;
  cursor: crosshair;
  opacity: 0;
  transition: opacity 0.15s ease;
}

.svg-node:hover .anchor-point, .anchor-point.active {
  opacity: 1;
}

/* --- ANIMATIONS --- */
@keyframes fadeIn {
  from { opacity: 0; transform: translateY(-4px); }
  to { opacity: 1; transform: translateY(0); }
}

@keyframes modalPop {
  from { opacity: 0; transform: scale(0.95); }
  to { opacity: 1; transform: scale(1); }
}

@keyframes slideInRight {
  from { opacity: 0; transform: translateX(20px); }
  to { opacity: 1; transform: translateX(0); }
}

/* --- PRINT MEDIA STYLES (@media print) --- */
@media print {
  @page {
    margin: 0;
  }

  html, body {
    background: #ffffff !important;
    color: #000000 !important;
    margin: 0 !important;
    padding: 0 !important;
    width: 100% !important;
    height: 100% !important;
    overflow: visible !important;
  }

  .app-header,
  .app-toolbar,
  .sidebar-shapes,
  .sidebar-inspector,
  .app-statusbar,
  .canvas-navigator,
  .floating-bar,
  .modal,
  .toast-container,
  #ruler-corner,
  #ruler-h,
  #ruler-v,
  .ruler-corner,
  .canvas-ruler,
  #canvas-scroll-h,
  #canvas-scroll-v,
  .canvas-scrollbar,
  #canvas-grid-bg,
  .page-sheet-outline,
  .page-label-text,
  .page-margin-guide,
  .page-center-guide,
  #guides-layer,
  .user-guide-line,
  .smart-guide-line,
  #selection-layer,
  .selection-box,
  .resize-handle,
  .rotation-handle,
  .anchor-point,
  .connector-label-placeholder {
    display: none !important;
    visibility: hidden !important;
    opacity: 0 !important;
  }

  .app-layout,
  .app-workspace,
  .canvas-viewport,
  .canvas-viewport.with-rulers,
  .canvas-viewport:not(.with-rulers) {
    display: block !important;
    position: static !important;
    width: 100% !important;
    height: 100% !important;
    margin: 0 !important;
    padding: 0 !important;
    background: #ffffff !important;
    border: none !important;
    overflow: visible !important;
  }

  #diagram-canvas {
    display: block !important;
    width: 100% !important;
    height: 100% !important;
    background: #ffffff !important;
  }
}