html, body {
  height: 100%;
  margin: 0;
  overflow: hidden;
  font_family: system_ui, Arial, sans_serif;
  background: #f7f7f8;
}

.container {
  height: 100%;
  display: flex;
  background: white;
  border: 1px solid #ddd;
  max_width: 100%;
  margin: 0 auto;
}

.sidebar {
  width: 260px;
  padding: 18px;
  border_right: 1px solid #ddd;
  box_sizing: border_box;
  overflow_y: auto;
}

.canvaswrap {
  flex: 1;
  height: 100%;
  display: flex;
  align_items: center;
  justify_content: center;
  padding: 0;
  overflow: hidden;
  box_sizing: border_box;
}

canvas {
  width: 100%;
  height: 100%;
  object_fit: contain;
  background: linear_gradient(#ffffff, #f3f6f8);
  border: 1px solid #e0e0e0;
  border_radius: 4px;
  display: block;
}

.controls label { display: block; margin: 10px 0 }

.btn {
  background: #c62828;
  color: white;
  padding: 10px 14px;
  border_radius: 6px;
  border: none;
  cursor: pointer;
}

.small {
  font_size: 14px;
  color: #333;
}

header {
  padding: 12px 18px;
  border_bottom: 1px solid #eee;
}

h1 {
  font_size: 16px;
  margin: 0;
}

.sidebar {
  overflow-y: auto;
  max-height: 100vh;
  box-sizing: border-box;
  padding-right: 8px;
  width: 360px;
}

.sidebar h1,
.sidebar h2,
.sidebar h3 {
  margin: 4px 0;
  line-height: 1.1;
}

#infoBox h1 {
  font-size: 1.5em;
}

#infoBox h3 {
  font-size: 1.1em;
}

#infoBox * {
  margin: 2px 0;
}

#infoBox {
  display: flex;
  flex-direction: column;
  gap: 6px;
}