.toolbar {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-wrap: wrap;
}
.tool-group {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 0 8px;
  border-right: 1px solid #30363d;
}
.tool-group:last-child { border-right: none; }
.tool-group label {
  display: flex;
  align-items: center;
  gap: 4px;
  font-size: 12px;
  color: #8b949e;
}
.tool-group input[type=range] { width: 90px; }
.curve-group {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 4px 6px;
  background: #0d1117;
  border: 1px solid #30363d;
  border-radius: 4px;
}
.curve-group .curve-controls {
  display: flex;
  flex-direction: column;
  gap: 2px;
}
.curve-group label {
  display: flex;
  align-items: center;
  gap: 4px;
  font-size: 11px;
  color: #8b949e;
  margin: 0;
}
.curve-group input[type=range] { width: 80px; }
.curve-group .num {
  color: #58a6ff;
  font-family: "SF Mono", Consolas, monospace;
  min-width: 30px;
  text-align: right;
  font-size: 11px;
}
.tool-group .num { color: #58a6ff; font-family: "SF Mono", Consolas, monospace; min-width: 28px; text-align: right; }
.toolbar button.active {
  background: #1f6feb;
  color: #fff;
  border-color: #1f6feb;
}
.toolbar button.primary {
  background: #238636;
  color: #fff;
  border-color: #238636;
}
.toolbar button.primary:hover:not(:disabled) { background: #2ea043; }
.link-btn {
  color: #58a6ff;
  text-decoration: none;
  font-size: 13px;
  padding: 4px 10px;
  border: 1px solid #30363d;
  border-radius: 4px;
}
.link-btn:hover { background: #21262d; }

.draw-main {
  padding: 16px 20px;
  display: flex;
  justify-content: center;
}
.canvas-frame {
  position: relative;
  background: #fff;
  border: 1px solid #30363d;
  border-radius: 6px;
  box-shadow: 0 4px 12px rgba(0,0,0,0.4);
  display: inline-block;
}
.canvas-frame canvas {
  display: block;
  border-radius: 6px;
  touch-action: none;            /* タッチ/ペンでのスクロールを抑止 */
  cursor: crosshair;
}
.canvas-frame.eraser-mode canvas { cursor: none; }
.canvas-frame .info {
  position: absolute;
  top: 8px;
  left: 10px;
  background: rgba(0,0,0,0.55);
  color: #fff;
  font-size: 11px;
  padding: 2px 8px;
  border-radius: 3px;
  pointer-events: none;
}
.canvas-frame .status {
  position: absolute;
  bottom: 8px;
  right: 10px;
  background: rgba(0,0,0,0.55);
  color: #58a6ff;
  font-family: "SF Mono", Consolas, monospace;
  font-size: 11px;
  padding: 2px 8px;
  border-radius: 3px;
  pointer-events: none;
}