body {
  font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
  margin: 0;
  padding: 2rem;
  background: #f0f2f5;
  color: #333;
}

h1 {
  text-align: center;
  margin-bottom: 2rem;
  color: #1a1a1a;
}

#app {
  display: grid;
  grid-template-columns: auto 300px;
  gap: 2rem;
  max-width: 1200px;
  margin: 0 auto;
  background: white;
  padding: 2rem;
  border-radius: 12px;
  box-shadow: 0 4px 20px rgba(0,0,0,0.08);
}

#drawing {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 1rem;
}

#canvas {
  image-rendering: pixelated;
  background-image: 
    linear-gradient(45deg, #eee 25%, transparent 25%), 
    linear-gradient(-45deg, #eee 25%, transparent 25%), 
    linear-gradient(45deg, transparent 75%, #eee 75%), 
    linear-gradient(-45deg, transparent 75%, #eee 75%);
  background-size: 20px 20px;
  background-position: 0 0, 0 10px, 10px -10px, -10px 0px;
  border: 2px solid #ddd;
  border-radius: 4px;
  cursor: crosshair;
  box-shadow: 0 2px 10px rgba(0,0,0,0.05);
}

#controls {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
  padding: 1rem;
  background: #f8f9fa;
  border-radius: 8px;
  width: 100%;
  justify-content: center;
}

#controls label {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.9rem;
  font-weight: 500;
}

#framePanel {
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
  border-left: 1px solid #eee;
  padding-left: 1.5rem;
}

#frameList {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(40px, 1fr));
  gap: 0.5rem;
  max-height: 200px;
  overflow-y: auto;
  padding: 0.5rem;
  background: #f8f9fa;
  border-radius: 6px;
}

.frameThumb {
  width: 40px;
  height: 40px;
  border: 2px solid #ddd;
  border-radius: 4px;
  cursor: pointer;
  background: white;
  image-rendering: pixelated;
}

.frameThumb.active {
  border-color: #007bff;
  box-shadow: 0 0 0 2px rgba(0,123,255,0.2);
}

#frameNav {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0.5rem;
}

button {
  padding: 0.6rem 1rem;
  border: 1px solid #ddd;
  background: white;
  border-radius: 6px;
  cursor: pointer;
  font-weight: 500;
  transition: all 0.2s;
}

button:hover {
  background: #f0f0f0;
  border-color: #ccc;
}

button.active {
  background: #007bff;
  color: white;
  border-color: #0056b3;
}

#eraserBtn.active {
  background: #dc3545;
  color: white;
  border-color: #bd2130;
}

#selectBtn.active {
  background: #6f42c1;
  color: white;
  border-color: #59359a;
}

#pasteSelBtn.active {
  background: #fd7e14;
  color: white;
  border-color: #d96a12;
}

#onionBtn.active {
  background: #ffc107;
  color: #212529;
  border-color: #e0a800;
}

#preview {
  text-align: center;
  background: #f8f9fa;
  padding: 1rem;
  border-radius: 8px;
}

#preview h2 {
  font-size: 1rem;
  margin-top: 0;
  margin-bottom: 1rem;
}

#previewCanvas {
  border: 1px solid #ddd;
  background: white;
  image-rendering: pixelated;
  margin-bottom: 1rem;
}

.anim-controls {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

#export {
  grid-column: 1 / -1;
  display: flex;
  gap: 1rem;
  justify-content: center;
  margin-top: 1rem;
  padding-top: 1rem;
  border-top: 1px solid #eee;
}

#export button {
  background: #28a745;
  color: white;
  border: none;
}

#export button:hover {
  background: #218838;
}

#export #exportJSON {
  background: #6c757d;
}

#export #exportJSON:hover {
  background: #5a6268;
}