/* AetherBoard CSS Design System */

:root {
  /* Common Brand Colors */
  --color-primary: #6366f1; /* Indigo */
  --color-primary-hover: #4f46e5;
  --color-primary-glow: rgba(99, 102, 241, 0.2);
  --color-accent: #a855f7; /* Purple */
  --color-danger: #f43f5e; /* Rose */
  --color-danger-hover: #e11d48;
  --color-success: #10b981; /* Emerald */

  /* Default Dark Theme Variables */
  --bg-app: #0b0f19;
  --bg-hud: rgba(15, 23, 42, 0.75);
  --bg-hud-hover: rgba(30, 41, 59, 0.85);
  --border-hud: rgba(255, 255, 255, 0.08);
  --text-main: #f1f5f9;
  --text-muted: #94a3b8;
  --board-bg: #121824;
  --grid-color: rgba(255, 255, 255, 0.06);
  --shadow-hud: 0 10px 30px -10px rgba(0, 0, 0, 0.5), 0 1px 1px 0 rgba(255, 255, 255, 0.05) inset;
  
  --board-selection: rgba(99, 102, 241, 0.3);
  --board-selection-outline: #6366f1;

  /* Sticky Notes Pale Colors (Dark Mode Text Contrast) */
  --sticky-yellow: #fef08a;
  --sticky-blue: #bfdbfe;
  --sticky-green: #bbf7d0;
  --sticky-pink: #fbcfe8;
  --sticky-purple: #e9d5ff;
  --sticky-orange: #fed7aa;
}

/* Light Theme Overrides */
body.theme-light {
  --bg-app: #f8fafc;
  --bg-hud: rgba(255, 255, 255, 0.75);
  --bg-hud-hover: rgba(241, 245, 249, 0.95);
  --border-hud: rgba(0, 0, 0, 0.08);
  --text-main: #0f172a;
  --text-muted: #64748b;
  --board-bg: #f1f5f9;
  --grid-color: rgba(0, 0, 0, 0.06);
  --shadow-hud: 0 10px 30px -10px rgba(0, 0, 0, 0.15), 0 1px 1px 0 rgba(255, 255, 255, 0.8) inset;

  --board-selection: rgba(99, 102, 241, 0.15);
  --board-selection-outline: #4f46e5;
}

/* General Resets */
* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
  user-select: none;
  -webkit-user-drag: none;
}

body, html {
  width: 100%;
  height: 100%;
  overflow: hidden;
  font-family: 'Plus Jakarta Sans', system-ui, sans-serif;
  background-color: var(--bg-app);
  color: var(--text-main);
  transition: background-color 0.3s ease;
}

/* Viewport & Canvas Layout */
#viewport-container {
  width: 100vw;
  height: 100vh;
  position: relative;
  overflow: hidden;
  background-color: var(--board-bg);
  cursor: grab;
}

#viewport-container.panning {
  cursor: grabbing;
}

#board-canvas {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  transform-origin: 0 0;
  /* Grid pattern using repeating dots */
  background-image: radial-gradient(var(--grid-color) 1.5px, transparent 1.5px);
  background-size: 30px 30px;
}

/* SVG Rendering Layer */
#svg-layer {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  overflow: visible;
  pointer-events: none;
  z-index: 3;
}

#svg-layer path, #svg-layer line {
  pointer-events: auto;
  cursor: pointer;
}

/* DOM Element rendering layer */
#dom-layer {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  overflow: visible;
  pointer-events: none;
  z-index: 2;
}

/* Glassmorphism Styles */
.glass {
  background: var(--bg-hud);
  backdrop-filter: blur(16px) saturate(180%);
  -webkit-backdrop-filter: blur(16px) saturate(180%);
  border: 1px solid var(--border-hud);
  box-shadow: var(--shadow-hud);
  border-radius: 12px;
  transition: background-color 0.2s ease, border-color 0.2s ease, box-shadow 0.2s ease;
}

/* HUD elements container */
#ui-hud {
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: 100;
  display: grid;
  grid-template-rows: auto 1fr auto;
  grid-template-columns: auto 1fr auto;
  padding: 16px;
  gap: 16px;
}

/* Shared HUD Button Styling */
.hud-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  border-radius: 8px;
  border: 1px solid transparent;
  background: transparent;
  color: var(--text-main);
  cursor: pointer;
  pointer-events: auto;
  transition: all 0.2s ease;
}

.hud-btn:hover {
  background-color: rgba(255, 255, 255, 0.08);
  border-color: var(--border-hud);
}

body.theme-light .hud-btn:hover {
  background-color: rgba(0, 0, 0, 0.05);
}

.hud-btn.active {
  background-color: var(--color-primary);
  color: white;
  box-shadow: 0 0 12px var(--color-primary-glow);
}

.hud-btn.primary {
  background-color: var(--color-primary);
  color: white;
  width: auto;
  padding: 0 16px;
  font-weight: 600;
  gap: 6px;
  box-shadow: 0 4px 12px var(--color-primary-glow);
}

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

.hud-btn.danger {
  color: var(--color-danger);
}

.hud-btn.danger:hover {
  background-color: rgba(244, 63, 94, 0.15);
  border-color: rgba(244, 63, 94, 0.3);
}

.icon {
  width: 20px;
  height: 20px;
  fill: none;
  stroke: currentColor;
  stroke-width: 2;
  stroke-linecap: round;
  stroke-linejoin: round;
}

.icon-sm {
  width: 16px;
  height: 16px;
  stroke-width: 2.2;
}

.font-sm {
  font-size: 13px;
  font-weight: 600;
}

.divider {
  width: 1px;
  height: 24px;
  background-color: var(--border-hud);
  margin: 0 8px;
  align-self: center;
}

.divider-v {
  height: 1px;
  width: 28px;
  background-color: var(--border-hud);
  margin: 8px 0;
}

/* TOP HUD BAR */
.hud-top-bar {
  grid-row: 1;
  grid-column: 1 / span 3;
  display: flex;
  justify-content: space-between;
  align-items: center;
  height: 56px;
  padding: 0 16px;
  pointer-events: auto;
}

.logo-section {
  display: flex;
  align-items: center;
  gap: 10px;
}

.logo-icon {
  width: 28px;
  height: 28px;
  border-radius: 6px;
  background: linear-gradient(135deg, var(--color-primary), var(--color-accent));
  box-shadow: 0 0 10px var(--color-primary-glow);
  position: relative;
}

.logo-icon::before {
  content: '';
  position: absolute;
  inset: 5px;
  background: white;
  border-radius: 3px;
  mix-blend-mode: overlay;
}

.logo-text {
  font-family: 'Outfit', sans-serif;
  font-size: 18px;
  font-weight: 700;
  letter-spacing: -0.5px;
  background: linear-gradient(to right, var(--text-main), var(--text-muted));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

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

.zoom-controls {
  display: flex;
  align-items: center;
  gap: 8px;
}

#zoom-level {
  font-size: 13px;
  font-weight: 600;
  width: 48px;
  text-align: center;
  color: var(--text-muted);
}

.right-actions {
  display: flex;
  align-items: center;
  gap: 12px;
}

/* Theme Icons Toggle */
#btn-theme-toggle .sun-icon {
  display: none;
}
body.theme-light #btn-theme-toggle .sun-icon {
  display: block;
}
body.theme-light #btn-theme-toggle .moon-icon {
  display: none;
}

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

.dropdown-content {
  display: none;
  position: absolute;
  right: 0;
  top: calc(100% + 8px);
  min-width: 180px;
  padding: 6px;
  z-index: 101;
  flex-direction: column;
  gap: 2px;
}

.dropdown:hover .dropdown-content {
  display: flex;
}

.dropdown-item {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 8px 12px;
  border-radius: 6px;
  background: transparent;
  border: none;
  color: var(--text-main);
  font-family: inherit;
  font-size: 14px;
  text-align: left;
  cursor: pointer;
  transition: background-color 0.2s ease;
}

.dropdown-item:hover {
  background-color: rgba(255, 255, 255, 0.08);
}

body.theme-light .dropdown-item:hover {
  background-color: rgba(0, 0, 0, 0.05);
}

/* LEFT HUD BAR (Toolbar) */
.hud-left-bar {
  grid-row: 2;
  grid-column: 1;
  align-self: center;
  display: flex;
  flex-direction: column;
  padding: 8px;
  gap: 6px;
  pointer-events: auto;
}

.tool-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 44px;
  height: 44px;
  border-radius: 8px;
  border: 1px solid transparent;
  background: transparent;
  color: var(--text-main);
  cursor: pointer;
  position: relative;
  transition: all 0.2s ease;
}

.tool-btn:hover {
  background-color: rgba(255, 255, 255, 0.08);
}

body.theme-light .tool-btn:hover {
  background-color: rgba(0, 0, 0, 0.05);
}

.tool-btn.active {
  background-color: var(--color-primary);
  color: white;
  box-shadow: 0 4px 12px var(--color-primary-glow);
}

.tool-btn.danger {
  color: var(--color-danger);
}

.tool-btn.danger:hover {
  background-color: rgba(244, 63, 94, 0.15);
  border-color: rgba(244, 63, 94, 0.2);
}

/* Tooltips & Submenus */
.palette-sub-menu, .shape-sub-menu, .pen-sub-menu {
  display: none;
  position: absolute;
  left: calc(100% + 12px);
  top: 50%;
  transform: translateY(-50%);
  padding: 10px;
  gap: 8px;
  z-index: 200;
  box-shadow: 0 10px 25px rgba(0,0,0,0.3);
}

.palette-sub-menu::before, .shape-sub-menu::before, .pen-sub-menu::before {
  content: '';
  position: absolute;
  left: -16px;
  top: -20px;
  bottom: -20px;
  width: 16px;
  background: transparent;
}

.tool-btn:hover .palette-sub-menu,
.tool-btn:hover .shape-sub-menu,
.tool-btn:hover .pen-sub-menu {
  display: flex;
}

.palette-sub-menu {
  flex-direction: row;
}

.color-dot {
  width: 22px;
  height: 22px;
  border-radius: 50%;
  cursor: pointer;
  border: 2px solid transparent;
  transition: transform 0.2s ease, border-color 0.2s ease;
  box-shadow: 0 2px 4px rgba(0,0,0,0.15);
}

.color-dot:hover {
  transform: scale(1.2);
}

.color-dot.active {
  border-color: var(--text-main);
  transform: scale(1.1);
}

.shape-sub-menu {
  flex-direction: row;
}

.shape-option {
  width: 32px;
  height: 32px;
  border-radius: 6px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-muted);
  cursor: pointer;
  transition: all 0.2s ease;
}

.shape-option:hover {
  background-color: rgba(255, 255, 255, 0.08);
  color: var(--text-main);
}

.shape-option.active {
  background-color: var(--color-primary);
  color: white;
}

.pen-sub-menu {
  flex-direction: column;
  min-width: 160px;
}

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

.pen-size-slider {
  display: flex;
  flex-direction: column;
  gap: 4px;
  font-size: 11px;
  font-weight: 600;
  color: var(--text-muted);
}

.pen-size-slider input[type="range"] {
  width: 100%;
}

/* RIGHT HUD BAR (Properties) */
.hud-right-bar {
  grid-row: 2;
  grid-column: 3;
  align-self: center;
  display: flex;
  flex-direction: column;
  width: 240px;
  max-height: calc(100vh - 120px);
  padding: 16px;
  gap: 16px;
  pointer-events: auto;
  overflow-y: auto;
  animation: slideInRight 0.25s cubic-bezier(0.16, 1, 0.3, 1) forwards;
}

.hud-right-bar.hidden {
  display: none;
}

@keyframes slideInRight {
  from {
    opacity: 0;
    transform: translateX(30px);
  }
  to {
    opacity: 1;
    transform: translateX(0);
  }
}

.panel-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  border-bottom: 1px solid var(--border-hud);
  padding-bottom: 8px;
}

.panel-header h3 {
  font-family: 'Outfit', sans-serif;
  font-size: 16px;
  font-weight: 600;
}

.hud-btn-close {
  background: transparent;
  border: none;
  color: var(--text-muted);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
}

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

.panel-section {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.panel-section label {
  font-size: 11px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  color: var(--text-muted);
}

.properties-color-grid {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 8px;
}

.properties-btn-group {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  background-color: rgba(0, 0, 0, 0.2);
  border-radius: 6px;
  padding: 2px;
  gap: 2px;
}

body.theme-light .properties-btn-group {
  background-color: rgba(0, 0, 0, 0.05);
}

.prop-btn {
  background: transparent;
  border: none;
  border-radius: 4px;
  padding: 6px 0;
  color: var(--text-muted);
  font-family: inherit;
  font-size: 12px;
  font-weight: 600;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all 0.2s ease;
}

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

.prop-btn.active {
  background-color: rgba(255, 255, 255, 0.1);
  color: var(--text-main);
  box-shadow: 0 1px 3px rgba(0,0,0,0.2);
}

body.theme-light .prop-btn.active {
  background-color: white;
  box-shadow: 0 1px 3px rgba(0,0,0,0.1);
}

.prop-slider-group {
  display: flex;
  flex-direction: column;
  gap: 4px;
  margin-top: 8px;
}

.slider-header {
  display: flex;
  justify-content: space-between;
  font-size: 11px;
  color: var(--text-muted);
  font-weight: 600;
}

.prop-slider-group input[type="range"] {
  width: 100%;
}

.danger-btn {
  background-color: rgba(244, 63, 94, 0.1);
  color: var(--color-danger);
  border: 1px solid rgba(244, 63, 94, 0.2);
  border-radius: 6px;
  padding: 8px 0;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.2s ease;
}

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

.w-full {
  width: 100%;
}

/* BOTTOM HUD BAR */
.hud-bottom-bar {
  grid-row: 3;
  grid-column: 1 / span 3;
  justify-self: center;
  padding: 6px 16px;
}

.kb-shortcuts {
  display: flex;
  gap: 16px;
  font-size: 11px;
  color: var(--text-muted);
  font-weight: 500;
}

.kb-shortcuts kbd {
  background-color: rgba(255, 255, 255, 0.1);
  border: 1px solid var(--border-hud);
  border-radius: 4px;
  padding: 1px 4px;
  margin-right: 2px;
  font-family: monospace;
}

body.theme-light .kb-shortcuts kbd {
  background-color: rgba(0, 0, 0, 0.05);
}

/* -------------------------------------------------------------------------- */
/* BOARD ELEMENTS SYSTEM (DOM Rendering) */
/* -------------------------------------------------------------------------- */

.board-element {
  position: absolute;
  pointer-events: auto;
  user-select: none;
  transform-origin: center center;
  will-change: transform, width, height;
}

/* Box-shadow for clean depth */
.board-element.shadow {
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.12), 0 2px 4px rgba(0, 0, 0, 0.08);
}

/* Focus and Selection Styles */
.board-element.selected {
  outline: 2px solid var(--color-primary) !important;
  outline-offset: 3px;
  z-index: 1000 !important;
}

.board-element.dragging {
  cursor: move !important;
  opacity: 0.9;
}

/* Resize Handles */
.resize-handle {
  position: absolute;
  width: 10px;
  height: 10px;
  background-color: white;
  border: 2px solid var(--color-primary);
  border-radius: 50%;
  pointer-events: auto;
  z-index: 10;
  display: none;
}

.board-element.selected .resize-handle {
  display: block;
}

.resize-handle.nw { top: -6px; left: -6px; cursor: nwse-resize; }
.resize-handle.ne { top: -6px; right: -6px; cursor: nesw-resize; }
.resize-handle.se { bottom: -6px; right: -6px; cursor: nwse-resize; }
.resize-handle.sw { bottom: -6px; left: -6px; cursor: nesw-resize; }

/* Connection Snap Points */
.snap-point {
  position: absolute;
  width: 12px;
  height: 12px;
  background-color: var(--color-accent);
  border: 2px solid white;
  border-radius: 50%;
  pointer-events: auto;
  z-index: 9;
  opacity: 0;
  transform: translate(-50%, -50%);
  transition: opacity 0.2s ease, transform 0.2s ease;
}

.board-element:hover .snap-point,
body.connecting-mode .board-element .snap-point {
  opacity: 0.7;
}

.board-element .snap-point:hover {
  opacity: 1;
  transform: translate(-50%, -50%) scale(1.3);
  background-color: var(--color-primary);
}

.snap-point.top { top: 0; left: 50%; }
.snap-point.right { top: 50%; left: 100%; }
.snap-point.bottom { top: 100%; left: 50%; }
.snap-point.left { top: 50%; left: 0; }

/* Sticky Note Style */
.sticky-note-element {
  background-color: var(--sticky-yellow);
  color: #1c1917; /* Dark slate text for legibility */
  padding: 16px;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 8px 16px -4px rgba(0, 0, 0, 0.18), 0 2px 4px rgba(0, 0, 0, 0.08);
  border-radius: 2px;
  font-family: 'Caveat', cursive, sans-serif;
  font-size: 20px;
  line-height: 1.2;
}

.sticky-note-element.selected {
  outline: 2px solid #a855f7 !important;
}

/* Shape Element Base */
.shape-element {
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: 12px;
  font-family: inherit;
  font-weight: 500;
  word-break: break-word;
  border-style: solid;
}

.shape-element.rect {
  border-radius: 6px;
}

.shape-element.circle {
  border-radius: 50%;
}

.shape-element.triangle {
  clip-path: polygon(50% 0%, 0% 100%, 100% 100%);
  border-style: none !important; /* Clipped elements can't use regular borders easily */
}

/* Transparent container representing clip path background border */
.triangle-border-svg {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  pointer-events: none;
}

.shape-element.diamond {
  clip-path: polygon(50% 0%, 100% 50%, 50% 100%, 0% 50%);
  border-style: none !important;
}

/* Text Element Base */
.text-element {
  background: transparent !important;
  border: 1px dashed transparent;
  color: var(--text-main);
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: inherit;
}

.text-element:hover {
  border-color: var(--border-hud);
}

.text-element.selected {
  border-color: var(--color-primary);
}

/* Editable Text Area */
.editable-text {
  width: 100%;
  max-height: 100%;
  border: none;
  outline: none;
  background: transparent;
  color: inherit;
  font-family: inherit;
  font-size: inherit;
  font-weight: inherit;
  text-align: inherit;
  resize: none;
  overflow: hidden;
  word-break: break-word;
  white-space: pre-wrap;
  cursor: text;
  pointer-events: auto;
}

/* Drawings on SVG Layer */
.drawing-path {
  fill: none;
  stroke-linecap: round;
  stroke-linejoin: round;
}

.drawing-path:hover {
  stroke-width: calc(var(--stroke-width) + 4px) !important;
  opacity: 0.8;
  transition: stroke-width 0.1s ease;
}

.drawing-path.selected {
  stroke: var(--color-primary) !important;
  filter: drop-shadow(0 0 4px var(--color-primary-glow));
}

/* Connection Lines on SVG Layer */
.connector-line {
  fill: none;
  stroke: var(--connector-color, #a855f7);
  stroke-width: 3;
  stroke-linecap: round;
  stroke-linejoin: round;
  marker-end: url(#arrow);
  pointer-events: auto;
  cursor: pointer;
  transition: stroke 0.15s ease, stroke-width 0.15s ease;
}

.connector-line:hover {
  stroke: var(--color-primary);
  stroke-width: 4;
  marker-end: url(#arrow-selected);
}

.connector-line.selected {
  stroke: var(--color-primary);
  stroke-width: 4;
  marker-end: url(#arrow-selected);
  filter: drop-shadow(0 0 3px var(--color-primary-glow));
}

/* SVG Line outline for connector line interaction helper */
.connector-interactive-helper {
  fill: none;
  stroke: transparent;
  stroke-width: 15;
  pointer-events: auto;
  cursor: pointer;
}

/* Loading Overlay & Spinner */
#loading-overlay {
  position: fixed;
  inset: 0;
  background-color: var(--bg-app);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 9999;
  opacity: 1;
  transition: opacity 0.3s ease;
}

#loading-overlay.hidden {
  opacity: 0;
  pointer-events: none;
}

.spinner {
  width: 40px;
  height: 40px;
  border: 4px solid var(--border-hud);
  border-top-color: var(--color-primary);
  border-radius: 50%;
  animation: spin 1s linear infinite;
}

@keyframes spin {
  to { transform: rotate(360deg); }
}

/* Slider (Input Range) Styling */
input[type="range"] {
  -webkit-appearance: none;
  background: rgba(255,255,255,0.1);
  height: 6px;
  border-radius: 3px;
  outline: none;
}
body.theme-light input[type="range"] {
  background: rgba(0,0,0,0.1);
}
input[type="range"]::-webkit-slider-thumb {
  -webkit-appearance: none;
  width: 14px;
  height: 14px;
  border-radius: 50%;
  background: var(--color-primary);
  cursor: pointer;
  transition: transform 0.1s ease;
}
input[type="range"]::-webkit-slider-thumb:hover {
  transform: scale(1.2);
}

/* Selection Marquee */
#selection-marquee {
  position: absolute;
  border: 1.5px dashed var(--color-primary);
  background-color: var(--board-selection);
  pointer-events: none;
  z-index: 99999;
}

/* Collaboration Cursors and Badge */
#cursors-layer {
  position: absolute;
  top: 0;
  left: 0;
  width: 100000px;
  height: 100000px;
  pointer-events: none;
  z-index: 9999;
}

.collaborator-cursor {
  position: absolute;
  width: 24px;
  height: 24px;
  transform: translate(-2px, -2px);
  will-change: transform;
  pointer-events: none;
  z-index: 10000;
  transition: transform 0.08s linear; /* Smooth mouse translations */
}

.collaborator-cursor svg {
  width: 18px;
  height: 18px;
  fill: var(--cursor-color, var(--color-primary));
  stroke: white;
  stroke-width: 1.5;
  filter: drop-shadow(0 2px 3px rgba(0,0,0,0.3));
}

.collaborator-cursor .cursor-label {
  position: absolute;
  left: 14px;
  top: 14px;
  background-color: var(--cursor-color, var(--color-primary));
  color: white;
  padding: 2px 6px;
  border-radius: 4px;
  font-size: 10px;
  font-weight: 700;
  white-space: nowrap;
  box-shadow: 0 4px 10px rgba(0,0,0,0.2);
}

.collab-badge {
  display: flex;
  align-items: center;
  gap: 6px;
  background-color: rgba(16, 185, 129, 0.12);
  border: 1px solid rgba(16, 185, 129, 0.2);
  color: var(--color-success);
  padding: 4px 10px;
  border-radius: 20px;
  font-size: 12px;
  font-weight: 600;
  margin-left: 8px;
  pointer-events: auto;
  position: relative;
}

.pulse-dot {
  width: 8px;
  height: 8px;
  background-color: var(--color-success);
  border-radius: 50%;
  box-shadow: 0 0 0 0 rgba(16, 185, 129, 0.7);
  animation: pulse-glow 1.6s infinite;
}

@keyframes pulse-glow {
  0% {
    transform: scale(0.95);
    box-shadow: 0 0 0 0 rgba(16, 185, 129, 0.7);
  }
  70% {
    transform: scale(1);
    box-shadow: 0 0 0 6px rgba(16, 185, 129, 0);
  }
  100% {
    transform: scale(0.95);
    box-shadow: 0 0 0 0 rgba(16, 185, 129, 0);
  }
}

/* Collaborators Hover Tooltip */
.collab-tooltip {
  display: none;
  position: absolute;
  top: calc(100% + 8px);
  left: 50%;
  transform: translateX(-50%);
  min-width: 180px;
  padding: 12px;
  z-index: 300;
  box-shadow: 0 10px 25px rgba(0, 0, 0, 0.3);
  flex-direction: column;
  gap: 8px;
  pointer-events: auto;
  font-family: 'Plus Jakarta Sans', sans-serif;
  color: var(--text-main);
  border-radius: 8px;
}

.collab-tooltip::before {
  content: '';
  position: absolute;
  top: -12px;
  left: 0;
  right: 0;
  height: 12px;
  background: transparent;
}

.collab-badge:hover .collab-tooltip {
  display: flex;
}

.collab-tooltip-title {
  font-size: 10px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  color: var(--text-muted);
  border-bottom: 1px solid var(--border-hud);
  padding-bottom: 6px;
  margin-bottom: 2px;
}

.collab-user-item {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 13px;
  font-weight: 500;
}

.collab-user-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background-color: var(--user-color, var(--color-success));
}

.collab-user-name {
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.collab-user-name.collab-user-me {
  color: var(--color-primary);
  font-weight: 600;
}

/* Board Selector Dropdown Styles */
.board-item-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: 100%;
  border-radius: 6px;
  transition: background-color 0.2s ease;
}

.board-item-row:hover {
  background-color: rgba(255, 255, 255, 0.08);
}

body.theme-light .board-item-row:hover {
  background-color: rgba(0, 0, 0, 0.05);
}

.board-item-row.active {
  background-color: rgba(99, 102, 241, 0.12);
}

.board-item-btn {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 8px 12px;
  color: var(--text-main);
  text-decoration: none;
  font-size: 14px;
  flex-grow: 1;
}

.board-item-btn.active {
  color: var(--color-primary) !important;
  font-weight: 600;
}

.btn-delete-board {
  background: transparent;
  border: none;
  color: var(--text-muted);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  width: 26px;
  height: 26px;
  border-radius: 4px;
  margin-right: 6px;
  transition: all 0.2s ease;
}

.btn-delete-board:hover {
  background-color: rgba(244, 63, 94, 0.15);
  color: var(--color-danger);
}

.icon-xs {
  width: 14px;
  height: 14px;
}

/* Image Element Base */
.image-element {
  background: transparent !important;
  border: 1px dashed transparent;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
}

.image-element:hover {
  border-color: var(--border-hud);
}

/* Drag & Drop Visual HUD Overlays */
#viewport-container.drag-active::after {
  content: 'Drop images or PDF files to import';
  position: absolute;
  inset: 16px;
  background: rgba(99, 102, 241, 0.08);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  border: 3px dashed var(--color-primary);
  border-radius: 16px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-main);
  font-family: 'Outfit', sans-serif;
  font-size: 24px;
  font-weight: 600;
  pointer-events: none;
  z-index: 9999;
  animation: pulse-border 1.5s infinite alternate ease-in-out;
  box-shadow: 0 0 40px rgba(99, 102, 241, 0.25);
}

@keyframes pulse-border {
  from {
    border-color: rgba(99, 102, 241, 0.5);
    background-color: rgba(99, 102, 241, 0.04);
  }
  to {
    border-color: rgba(99, 102, 241, 0.95);
    background-color: rgba(99, 102, 241, 0.12);
  }
}

/* Owner Admin Controls Styles */
.collab-tooltip-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 8px;
  padding-bottom: 6px;
  border-bottom: 1px solid var(--border-hud);
  gap: 12px;
}

.btn-summon-all-hud {
  background: var(--color-primary);
  color: white;
  border: none;
  border-radius: 4px;
  font-size: 10px;
  font-weight: 700;
  padding: 3px 8px;
  cursor: pointer;
  transition: background-color 0.2s ease, transform 0.1s ease;
}

.btn-summon-all-hud:hover {
  background-color: var(--color-primary-hover);
  transform: scale(1.05);
}

.owner-actions {
  display: flex;
  gap: 4px;
  margin-left: auto;
}

.btn-kick-user, .btn-ban-user {
  background: rgba(255, 255, 255, 0.08);
  border: 1px solid var(--border-hud);
  border-radius: 4px;
  color: var(--text-main);
  font-size: 10px;
  font-weight: 700;
  width: 18px;
  height: 18px;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: all 0.2s ease;
}

.btn-kick-user:hover {
  background-color: var(--color-danger);
  color: white;
  border-color: var(--color-danger);
}

.btn-ban-user:hover {
  background-color: #ef4444;
  color: white;
  border-color: #ef4444;
}

/* Mobile and Tablet Responsiveness Media Queries */
@media (max-width: 1024px) {
  .hud-btn {
    width: 36px;
    height: 36px;
    border-radius: 6px;
  }
  
  .hud-btn.primary {
    padding: 0 12px;
    font-size: 13px;
  }
  
  .icon {
    width: 18px;
    height: 18px;
  }
  
  .divider {
    height: 16px;
    margin: 0 4px;
  }

  #ui-hud {
    display: block; /* Disable grid layout on mobile to prevent vertical cell clipping */
    padding: 8px;
  }

  .hud-top-bar {
    position: absolute;
    top: 8px;
    left: 8px;
    width: calc(100% - 16px);
    height: auto;
    padding: 6px 10px;
    flex-wrap: wrap;
    gap: 6px 8px;
    justify-content: space-between;
    pointer-events: auto;
  }

  .logo-section {
    gap: 6px;
  }

  .zoom-controls {
    gap: 4px;
  }

  #zoom-level {
    width: 36px;
    font-size: 11px;
  }

  .hud-left-bar {
    position: absolute;
    bottom: calc(8px + env(safe-area-inset-bottom, 0px));
    left: 50%;
    transform: translateX(-50%);
    flex-direction: row;
    padding: 6px;
    border-radius: 12px;
    pointer-events: auto;
  }

  .tool-btn {
    width: 38px;
    height: 38px;
  }

  .divider-v {
    width: 1px;
    height: 20px;
    margin: 0 6px;
    align-self: center;
  }

  .palette-sub-menu, .shape-sub-menu, .pen-sub-menu {
    left: 50%;
    bottom: calc(100% + 10px);
    top: auto;
    transform: translateX(-50%);
    box-shadow: 0 -4px 15px rgba(0,0,0,0.2);
  }

  .palette-sub-menu::before, .shape-sub-menu::before, .pen-sub-menu::before {
    left: -10px;
    right: -10px;
    top: 100%;
    bottom: -12px;
    height: 12px;
    width: auto;
  }

  .hud-right-bar {
    position: fixed;
    right: 8px;
    bottom: calc(70px + env(safe-area-inset-bottom, 0px));
    top: auto;
    width: calc(100% - 16px);
    max-width: 360px;
    max-height: 40%;
    border-radius: 12px;
    z-index: 102;
    pointer-events: auto;
  }

  .hud-bottom-bar {
    display: none;
  }
}

@media (max-width: 599px) {
  .logo-text {
    display: none;
  }
}

/* Extra Small Screens (iPhone, narrow mobile viewports) Toolbar Optimization */
@media (max-width: 480px) {
  .hud-left-bar {
    padding: 4px;
    gap: 4px;
  }
  .tool-btn {
    width: 32px;
    height: 32px;
    border-radius: 6px;
  }
  .divider-v {
    height: 16px;
    margin: 0 4px;
  }
  .icon {
    width: 16px;
    height: 16px;
  }
}