* { box-sizing: border-box; }
html, body { height: 100%; margin: 0; font-family: system-ui, -apple-system, "Segoe UI", Roboto, "Noto Sans JP", sans-serif; }
button, input, textarea { font: inherit; }

.toolbar {
  display: flex;
  gap: 12px;
  align-items: center;
  padding: 10px 12px;
  border-bottom: 1px solid #ddd;
  background: #fafafa;
  position: sticky;
  top: 0;
  z-index: 10;
}

.group { display: flex; gap: 8px; align-items: center; }
.tool {
  padding: 6px 10px;
  border: 1px solid #ccc;
  background: #fff;
  border-radius: 8px;
  cursor: pointer;
}
.tool.active { border-color: #333; }

.num { width: 64px; }

.layout {
  height: calc(100% - 56px);
  display: grid;
  grid-template-columns: 1fr 340px;
}

.stage-wrap {
  position: relative;
  overflow: auto;
  padding: 16px;
  background: #d9d9d9;
}

.checker {
  /* Photoshopっぽい透明背景チェッカー */
  background: #d9d9d9;
}

#stage {
  display: block;
  width: auto;
  height: auto;
  border: 1px solid #b8b8b8;
  background: #fff;
  touch-action: none; /* pointerでドラッグしたいので重要 */
}

.side {
  border-left: 1px solid #ddd;
  padding: 12px;
  overflow: auto;
  background: #fff;
}

h3 { margin: 12px 0 6px; }
.hint { margin: 0 0 8px; color: #555; font-size: 12px; line-height: 1.4; }

textarea {
  width: 100%;
  min-height: 140px;
  resize: vertical;
  padding: 8px;
  border: 1px solid #ccc;
  border-radius: 8px;
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, "Noto Sans Mono", monospace;
  font-size: 12px;
}

.row { display: flex; gap: 8px; margin-top: 8px; }
.row button {
  padding: 8px 10px;
  border-radius: 8px;
  border: 1px solid #ccc;
  background: #f7f7f7;
  cursor: pointer;
}

.kv {
  display: grid;
  grid-template-columns: 64px 1fr;
  gap: 6px 10px;
  border: 1px solid #eee;
  padding: 10px;
  border-radius: 8px;
}
.k { color: #666; font-size: 12px; }
.v { font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace; font-size: 12px; }

#content text {
  cursor: default;
}