* { box-sizing: border-box; }
html, body { height: 100%; }
body {
  margin: 0;
  height: 100vh;
  display: flex; flex-direction: column; gap: 6px;
  padding: 6px 8px;
  overflow: hidden;                 /* 整页固定在一屏内 */
  font-family: system-ui, -apple-system, "Segoe UI", Roboto, "Microsoft YaHei", sans-serif;
  background: #f4f6fb;
  color: #222;
}
button, input, select { font: inherit; }

/* 顶栏 */
.topbar { flex: 0 0 auto; }
.top-in {
  display: flex; align-items: center; gap: 10px; flex-wrap: wrap;
  background: #fff; border: 1px solid #d8dce6; border-radius: 8px; padding: 6px 10px;
}
#title { width: 170px; padding: 4px 8px; border: 1px solid #dde1e9; border-radius: 6px; }
#status { flex: 1; min-width: 120px; color: #888; font-size: 12px; text-align: right; white-space: nowrap; }
.transport button { min-width: 66px; padding: 4px 8px; cursor: pointer; }

/* 主体：左工具栏 + 两块预览谱 */
.stage { flex: 1 1 auto; min-height: 0; display: flex; gap: 8px; }

#toolbar {
  flex: 0 0 auto; width: 168px; background: #fff; border: 1px solid #d8dce6;
  border-radius: 8px; padding: 10px 12px; display: flex; flex-direction: column; gap: 10px;
  overflow-y: auto;
}
#toolbar h3 { margin: 0 0 2px; font-size: 13px; color: #555; }
.ctl label { display: block; font-size: 12px; color: #666; margin-bottom: 3px; }
.ctl.check { display: flex; align-items: center; gap: 6px; }
.ctl.check label { margin: 0; cursor: pointer; }
.ctl input[type="number"] { width: 100%; padding: 4px; }
.ctl select { width: 100%; padding: 4px; }
.btn-row { display: flex; flex-direction: column; gap: 6px; margin-top: 4px; }
.btn-row button { padding: 6px; cursor: pointer; }
.sample-status { font-size: 11px; color: #666; line-height: 1.45; border-top: 1px dashed #d5d9e2; padding-top: 8px; }

/* 面板：两块预览谱，居中并保持整页可视 */
.panels {
  flex: 1 1 auto; min-width: 0; display: flex;
  align-items: center; justify-content: center; gap: 10px; overflow: hidden;
}
.previewer {
  flex: 0 0 auto; background: #fff; border: 2px solid #b9bfcc; border-radius: 10px;
  padding: 6px 8px 8px; text-align: center;
}
.pv-title { font-weight: 600; margin: 0 0 4px; font-size: 14px; line-height: 18px; height: 20px; }
.previewer canvas {
  display: block; background: #fff; border: 1px solid #e3e6ee; border-radius: 4px;
  touch-action: none; user-select: none; -webkit-user-select: none; cursor: crosshair;
}

/* 底部进度条 */
.progressbar {
  flex: 0 0 auto; background: #fff; border: 1px solid #d8dce6; border-radius: 8px;
  padding: 6px 12px; display: flex; align-items: center; gap: 12px;
}
.progressbar input[type="range"] { flex: 1; min-width: 0; }
#time { font-variant-numeric: tabular-nums; color: #444; min-width: 118px; text-align: right; }