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

:root {
  --bg-dark: #121212;
  --bg-sidebar: #1a1a1a;
  --bg-hover: #2a2a2a;
  --text-primary: #ffffff;
  --text-secondary: #b0b0b0;
  --accent-primary: #4caf50;
  --accent-secondary: #f44336;
  --accent-warning: #ff9800;
  --accent-info: #2196f3;
  --border-color: #333;
  --sidebar-width: 280px;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, sans-serif;
  background: #000;
  color: var(--text-primary);
  overflow: hidden;
  height: 100vh;
  width: 100vw;
}

/* Menu Toggle Button */
.menu-toggle {
  position: fixed;
  top: 16px;
  left: 16px;
  z-index: 1000;
  width: 48px;
  height: 48px;
  border: none;
  border-radius: 8px;
  background: var(--bg-sidebar);
  color: var(--text-primary);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: background 0.2s;
}

.menu-toggle:hover {
  background: var(--bg-hover);
}

/* Sidebar */
.sidebar {
  position: fixed;
  top: 0;
  left: 0;
  width: var(--sidebar-width);
  height: 100vh;
  background: var(--bg-sidebar);
  z-index: 1001;
  transform: translateX(-100%);
  transition: transform 0.3s ease;
  display: flex;
  flex-direction: column;
  box-shadow: 2px 0 8px rgba(0, 0, 0, 0.3);
}

.sidebar.open {
  transform: translateX(0);
}

.sidebar-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 16px;
  border-bottom: 1px solid var(--border-color);
}

.sidebar-header h1 {
  font-size: 1.5rem;
  font-weight: 600;
}

.close-btn {
  width: 32px;
  height: 32px;
  border: none;
  background: transparent;
  color: var(--text-primary);
  font-size: 24px;
  cursor: pointer;
  border-radius: 4px;
  line-height: 1;
}

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

.sidebar-content {
  flex: 1;
  overflow-y: auto;
  padding: 16px;
}

.sidebar-content::-webkit-scrollbar {
  width: 8px;
}

.sidebar-content::-webkit-scrollbar-track {
  background: var(--bg-dark);
}

.sidebar-content::-webkit-scrollbar-thumb {
  background: var(--border-color);
  border-radius: 4px;
}

.sidebar-content::-webkit-scrollbar-thumb:hover {
  background: #444;
}

/* Buttons */
.button-row {
  display: flex;
  gap: 8px;
  margin-bottom: 16px;
}

.btn {
  flex: 1;
  padding: 12px 16px;
  border: none;
  border-radius: 8px;
  font-size: 14px;
  font-weight: 500;
  cursor: pointer;
  transition: all 0.2s;
  background: var(--bg-hover);
  color: var(--text-primary);
}

.btn-primary {
  background: var(--accent-primary);
  color: white;
}

.btn-primary:hover {
  background: #45a049;
}

.btn-secondary {
  background: var(--accent-info);
  color: white;
}

.btn-secondary:hover {
  background: #1976d2;
}

.btn-icon {
  flex: 0 0 auto;
  width: 48px;
  padding: 12px;
  font-size: 20px;
}

.btn:hover {
  transform: translateY(-1px);
  box-shadow: 0 2px 4px rgba(0, 0, 0, 0.2);
}

/* Control Groups */
.control-group {
  margin-bottom: 20px;
}

.control-group label {
  display: block;
  margin-bottom: 8px;
  font-size: 14px;
  font-weight: 500;
  color: var(--text-secondary);
}

.control-group select {
  width: 100%;
  padding: 10px;
  border: 1px solid var(--border-color);
  border-radius: 6px;
  background: var(--bg-dark);
  color: var(--text-primary);
  font-size: 14px;
  cursor: pointer;
}

.control-group select:hover {
  border-color: #555;
}

.control-group select:focus {
  outline: none;
  border-color: var(--accent-primary);
}

.control-group input[type="range"] {
  width: 100%;
  height: 6px;
  border-radius: 3px;
  background: var(--bg-dark);
  outline: none;
  -webkit-appearance: none;
}

.control-group input[type="range"]::-webkit-slider-thumb {
  -webkit-appearance: none;
  appearance: none;
  width: 18px;
  height: 18px;
  border-radius: 50%;
  background: var(--accent-primary);
  cursor: pointer;
}

.control-group input[type="range"]::-moz-range-thumb {
  width: 18px;
  height: 18px;
  border-radius: 50%;
  background: var(--accent-primary);
  cursor: pointer;
  border: none;
}

/* Toggle Switches */
.toggle-group {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.toggle {
  display: flex;
  align-items: center;
  cursor: pointer;
}

.toggle input[type="checkbox"] {
  display: none;
}

.toggle-track {
  position: relative;
  width: 48px;
  height: 24px;
  background: var(--bg-dark);
  border-radius: 12px;
  transition: background 0.2s;
  margin-right: 12px;
}

.toggle-handle {
  position: absolute;
  top: 2px;
  left: 2px;
  width: 20px;
  height: 20px;
  background: var(--text-secondary);
  border-radius: 50%;
  transition: transform 0.2s;
}

.toggle input[type="checkbox"]:checked + .toggle-track {
  background: var(--accent-primary);
}

.toggle input[type="checkbox"]:checked + .toggle-track .toggle-handle {
  transform: translateX(24px);
  background: white;
}

.toggle-label {
  font-size: 14px;
  color: var(--text-primary);
}

/* Divider */
hr {
  border: none;
  border-top: 1px solid var(--border-color);
  margin: 16px 0;
}

/* Canvas Container */
.canvas-container {
  position: fixed;
  top: 0;
  left: 0;
  width: 100vw;
  height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  background: #000;
  overflow: hidden;
}

#mainCanvas {
  display: block;
  position: absolute;
  /* Canvas will be positioned absolutely by JavaScript */
  image-rendering: pixelated;
  image-rendering: -moz-crisp-edges;
  image-rendering: crisp-edges;
}

/* Overlay */
.overlay {
  position: fixed;
  top: 0;
  left: 0;
  width: 100vw;
  height: 100vh;
  background: rgba(0, 0, 0, 0.5);
  z-index: 1000;
  display: none;
}

.overlay.show {
  display: block;
}

/* Modal */
.modal {
  position: fixed;
  top: 0;
  left: 0;
  width: 100vw;
  height: 100vh;
  z-index: 2000;
  display: none;
  align-items: center;
  justify-content: center;
  opacity: 0;
  transition: opacity 0.3s ease;
}

.modal.show {
  display: flex;
  opacity: 1;
}

.modal-backdrop {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(0, 0, 0, 0.7);
  backdrop-filter: blur(4px);
}

.modal-content {
  position: relative;
  background: var(--bg-sidebar);
  border-radius: 12px;
  max-width: 90%;
  width: 400px;
  max-height: 80vh;
  overflow: hidden;
  box-shadow: 0 8px 32px rgba(0, 0, 0, 0.5);
  transform: scale(0.9);
  transition: transform 0.3s ease;
  display: flex;
  flex-direction: column;
}

.modal.show .modal-content {
  transform: scale(1);
}

.modal-header {
  padding: 20px 24px;
  border-bottom: 1px solid var(--border-color);
}

.modal-header h2 {
  font-size: 1.5rem;
  font-weight: 600;
  color: var(--text-primary);
  margin: 0;
}

.modal-body {
  padding: 24px;
  color: var(--text-secondary);
  line-height: 1.6;
  overflow-y: auto;
  flex: 1;
}

.modal-body p {
  margin: 0 0 12px 0;
  text-align: center;
}

.modal-body p:last-child {
  margin-bottom: 0;
}

.modal-body strong {
  color: var(--text-primary);
  font-weight: 600;
}

.modal-body a {
  color: var(--accent-primary);
  text-decoration: none;
  font-weight: 500;
}

.modal-body a:hover {
  text-decoration: underline;
}

.modal-footer {
  padding: 16px 24px;
  border-top: 1px solid var(--border-color);
  display: flex;
  justify-content: flex-end;
  gap: 12px;
}

.modal-footer .btn {
  min-width: 80px;
}

@media (max-width: 600px) {
  .modal-content {
    width: 95%;
    max-height: 85vh;
  }

  .modal-header {
    padding: 16px 20px;
  }

  .modal-body {
    padding: 20px;
  }

  .modal-footer {
    padding: 12px 20px;
  }
}

/* Responsive */
@media (max-width: 768px) {
  .sidebar {
    width: 100%;
    max-width: 320px;
  }
}