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

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  background: #f5f5f5;
  color: #222;
  min-height: 100vh;
  display: flex;
  justify-content: center;
  align-items: center;
}

.container {
  display: flex;
  gap: 32px;
  align-items: flex-start;
  padding: 32px;
  max-width: 1200px;
  width: 100%;
}

.panel {
  min-width: 300px;
  background: #fff;
  padding: 24px;
  border-radius: 8px;
  box-shadow: 0 2px 8px rgba(0,0,0,0.08);
}

.panel h2 {
  font-size: 18px;
  margin-bottom: 20px;
  font-weight: 600;
}

.form-group {
  margin-bottom: 14px;
}

.form-group label {
  display: block;
  font-size: 13px;
  margin-bottom: 4px;
  color: #555;
}

.form-group input {
  width: 100%;
  padding: 8px 10px;
  font-size: 15px;
  border: 1px solid #ccc;
  border-radius: 4px;
  outline: none;
}

.form-group input:focus {
  border-color: #4a90d9;
}

button {
  width: 100%;
  padding: 10px;
  font-size: 15px;
  background: #222;
  color: #fff;
  border: none;
  border-radius: 4px;
  cursor: pointer;
  margin-top: 4px;
}

button:hover {
  background: #444;
}

.color-picker {
  margin: 14px 0 6px;
}

.color-label {
  font-size: 13px;
  margin-bottom: 6px;
  color: #555;
}

.color-btns {
  display: flex;
  gap: 8px;
}

.color-btn {
  width: 36px;
  height: 36px;
  border: 3px solid transparent;
  border-radius: 50%;
  cursor: pointer;
  flex: none;
  transition: border-color 0.15s;
}

.color-btn:hover {
  border-color: #bbb;
}

.color-btn.active {
  border-color: #222;
}

#resetBtn {
  width: 100%;
  padding: 8px;
  font-size: 13px;
  background: #eee;
  color: #333;
  border: 1px solid #ccc;
  border-radius: 4px;
  cursor: pointer;
  margin-top: 6px;
}

#resetBtn:hover {
  background: #ddd;
}

.info {
  margin-top: 12px;
  font-size: 13px;
  color: #888;
  min-height: 20px;
}

.canvas-wrapper {
  flex: 1;
  display: flex;
  justify-content: center;
  align-items: center;
  background: #fff;
  border-radius: 8px;
  box-shadow: 0 2px 8px rgba(0,0,0,0.08);
  padding: 16px;
  min-height: 300px;
}

canvas {
  display: block;
  max-width: 100%;
  max-height: 80vh;
}