/* ===== 简谱可视化编辑器 - 补充样式 ===== */
/* 共享变量在 main.css 中定义，此处仅定义编辑器特有变量 */
:root {
  --note-selected: #FFE4B5;
  --note-hover: #FFF8F0;
  --note-drag-over: #E8D5C0;
  --drag-insert-line: #8B4513;
  --barline-color: #2C1810;
  --bg-canvas: #FFFFFF;
  --endline-color: #2C1810;
  --panel-width: 180px;
  --note-playing: #B3E5FC;
  --note-playing-border: #0288D1;
}

/* #editor-app, #editor-toolbar, #editor-main, #editor-statusbar 等不再使用（已合并到主页） */
/* 编辑器子工具栏样式在 main.css 中定义 */

/* ===== 编辑模式切换 ===== */
/* mode-btn 和 mode-switch 样式在 main.css 的 .editor-sub-toolbar 中定义 */

/* ===== 主内容区 ===== */
/* #editor-main 不再使用，布局由 .editor-main-area 控制 */

/* ===== 左侧：音符面板 ===== */
#element-panel {
  width: var(--panel-width);
  background: var(--bg-panel);
  border-right: 1px solid var(--border-color);
  overflow-y: auto;
  padding: 8px;
}

.panel-section {
  margin-bottom: 12px;
}

.panel-section-title {
  font-size: 12px;
  font-weight: 600;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 1px;
  margin-bottom: 6px;
  padding-bottom: 4px;
  border-bottom: 1px solid var(--border-color);
}

.element-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 4px;
}
.markers-grid {
  grid-template-columns: repeat(4, 1fr);
}

.click-element {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  background: var(--bg-primary);
  border: 1px solid var(--border-color);
  border-radius: 6px;
  padding: 6px 2px;
  cursor: pointer;
  transition: all 0.15s;
  min-height: 48px;
  -webkit-user-select: none;
  user-select: none;
}
.click-element:hover {
  background: var(--accent-light);
  border-color: var(--accent-color);
  transform: scale(1.05);
}
.click-element:active {
  transform: scale(0.95);
}

.elem-note {
  font-size: 20px;
  font-weight: 700;
  color: var(--text-primary);
  line-height: 1;
}

.elem-label {
  font-size: 9px;
  color: var(--text-muted);
  margin-top: 2px;
}

.markers-grid .click-element .elem-note {
  font-size: 16px;
  font-weight: 700;
}

/* ===== 中间：画布区域 ===== */
#canvas-section {
  flex: 1;
  display: flex;
  flex-direction: column;
  overflow: hidden;
  background: var(--bg-secondary);
  padding: 8px;
}

#canvas-viewport {
  flex: 1;
  overflow: auto;
  background: var(--bg-secondary);
  border-radius: 6px;
  box-shadow: inset 0 1px 4px rgba(0,0,0,0.1);
  display: flex;
  justify-content: center;
  align-items: flex-start;
  padding: 16px;
}

#canvas-scroll {
  /* A4 比例：210:297 ≈ 1:1.414 */
  /* 默认纸宽1134px，JS通过字号缩放动态调整 */
  width: 1134px;
  min-height: 1603px;
  background: var(--bg-canvas);
  border-radius: 4px;
  box-shadow: 0 2px 8px rgba(0,0,0,0.12);
  flex-shrink: 0;
  position: relative; /* 使 jianpu-canvas.offsetTop 相对于此容器 */
}

#jianpu-canvas {
  position: relative;
  min-height: 200px;
  padding: 100px 80px;
}

/* ===== 曲谱头部 ===== */
.score-header {
  text-align: center;
  margin-bottom: 16px;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--border-color);
}
.score-title-row {
  display: flex;
  justify-content: center;
  align-items: baseline;
  position: relative;
  margin-bottom: 8px;
}
.score-title {
  font-size: 24px;
  font-weight: 700;
  color: var(--text-primary);
  letter-spacing: 2px;
}
.score-author {
  margin-left: auto;
  font-size: 14px;
  font-weight: 400;
  color: var(--text-secondary);
}
.score-info-row {
  display: flex;
  justify-content: flex-start;
  align-items: center;
  gap: 24px;
  font-size: 14px;
  color: var(--text-secondary);
}
.score-info-item {
  display: inline-flex;
  align-items: center;
}

/* ===== 分页标题（多页时每页顶部） ===== */
.score-page-header {
  text-align: center;
  margin-bottom: 16px;
  padding: 20px 0 12px;
  border-bottom: 1px solid var(--border-color);
  page-break-before: always;
}

/* ===== 分页边界（编辑器中两页之间的可视分隔） ===== */
/* 通用（简谱 #jianpu-canvas，padding: 0 80px） */
.page-boundary {
  height: 28px;
  position: relative;
  margin: 0 -80px;  /* 扩展到 canvas 全宽（白底A4页面区域） */
  background: var(--bg-secondary);
  box-shadow: 0 -4px 6px -2px rgba(0,0,0,0.08);
}
.page-boundary::before {
  content: '';
  position: absolute;
  left: 80px;
  right: 80px;
  top: 50%;
  height: 0;
  border-top: 1px dashed #d0d0d0;
}
.page-boundary::after {
  content: '';
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 4px;
  background: var(--bg-canvas);
  box-shadow: 0 2px 4px rgba(0,0,0,0.04);
}

/* 二声部（#harmony-canvas，padding: 20px 40px） */
#harmony-canvas .page-boundary {
  margin: 0 -40px;
}
#harmony-canvas .page-boundary::before {
  left: 40px;
  right: 40px;
}

/* ===== 页码 ===== */
.score-footer {
  text-align: center;
  margin-top: 20px;
  padding-top: 12px;
}
.page-number {
  font-size: 12px;
  color: var(--text-muted);
}

/* 画布上的元素行 */
.canvas-row {
  display: flex;
  align-items: flex-start;
  gap: 0;
  min-height: 80px;
  padding: 12px 0;
  position: relative;
  margin-bottom: 16px;
}

/* 非最后一行：内容拉伸填满（row-spacer-stretch 自动占满剩余空间） */
.canvas-row-justified {
  /* 保留类名兼容，实际由 row-spacer-stretch 处理 */
}

/* 小节容器：内含 beat-group + barline-col（仅用于第一遍测量宽度） */
.measure-group {
  display: flex;
  flex-direction: row;
  align-items: flex-start;
  flex-shrink: 0;
}

/* 非最后一行：小节均匀拉伸（仅用于第一遍测量，平铺布局后不再使用） */
.measure-group-justified {
  flex: 1 1 0;
  min-width: 0;
}

/* 行内弹性间隔：均匀分布行内元素（beat-group 和 barline-col 之间） */
.row-spacer {
  width: 8px;
  flex-shrink: 0;
}
.row-spacer-stretch {
  flex: 1 1 0;
  min-width: 0;
}

/* 拍组容器 - 列式布局 */
.beat-group {
  display: flex;
  flex-direction: row;
  align-items: flex-start;
  position: relative;
  gap: 2px;
}

/* 音符列 - 每个音符独占一列，包含所有装饰 */
.beat-col {
  display: flex;
  flex-direction: column;
  align-items: center;
  position: relative;
  min-width: 20px;
}

/* 小节线列 - 与音符列对齐（不使用居中，保持top-reserve+middle结构一致） */
.beat-col.barline-col,
.beat-col.endline-col {
  /* 与音符列使用相同结构，确保中线对齐 */
  min-width: 36px;
}

/* 列顶部预留区：连音符号 + 2个高8度圆点 */
.col-top-reserve {
  height: 26px;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: flex-end;
  gap: 1px;
  position: relative;
}

/* 列中部：唱名行 */
.col-middle {
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 0 4px;
  min-height: 24px;
  overflow: visible;
}

/* 列底部区域：减时线 + 低音圆点（动态，低音圆点紧跟最后一根减时线） */
.col-bottom {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 2px;
  padding: 1px 2px 0;
}
.bottom-row {
  height: 2px;
  width: 100%;
  min-width: 16px;
}
.bottom-row.subline-connected {
  background: var(--text-primary);
  border-radius: 1px;
}
.bottom-row.low-dot-row {
  height: 5px;
  display: flex;
  align-items: center;
  justify-content: center;
}

/* 八度圆点 */
.octave-dot {
  width: 5px;
  height: 5px;
  border-radius: 50%;
  background: var(--text-primary);
  flex-shrink: 0;
}

/* 高八度圆点容器（音符上方竖直排列） */
.octave-dots-high {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 2px;
}

/* 低八度/减时线占位（不再使用） */
.octave-low-indicator, .subline-indicator {
  display: none;
}

/* 增时线独立列 */
.ext-line-col {
  min-width: 20px;
  padding: 0 8px; /* 前后空隙加倍 */
}

/* 增时线标记 - 与音符水平中线对齐（flex垂直居中） */
.ext-line-mark {
  width: 20px;
  height: 2px;
  background: var(--text-primary);
  border-radius: 1px;
}

/* 附点独立列 */
.dot-col {
  min-width: 8px;
}

/* 附点标记 */
.dot-mark {
  width: 5px;
  height: 5px;
  border-radius: 50%;
  background: var(--text-primary);
  margin-top: 8px; /* 对齐唱名中线：11px - 2.5px半高 ≈ 8.5px */
}

/* 画布上的可放置区域（零宽度，不参与布局，编辑/导出布局一致） */
.canvas-drop-zone {
  width: 0;
  min-width: 0;
  min-height: 60px;
  position: relative;
  flex-shrink: 0;
  overflow: visible;
}
/* 可点击/拖放区域：向两侧各扩展 4px */
.canvas-drop-zone::after {
  content: '';
  position: absolute;
  left: -4px;
  right: -4px;
  top: 0;
  bottom: 0;
  z-index: 1;
}
.canvas-drop-zone.drag-over {
  background: rgba(139,69,19,0.15);
}
.canvas-drop-zone.cursor-active::before {
  content: '';
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 2px;
  background: var(--accent-color);
  border-radius: 1px;
  animation: cursor-blink 1s step-end infinite;
  z-index: 10;
}
@keyframes cursor-blink {
  0%, 100% { opacity: 1; }
  50% { opacity: 0; }
}

/* 画布上的音符元素 */
.canvas-element {
  display: inline-flex;
  align-items: baseline;
  position: relative;
  cursor: pointer;
  border-radius: 4px;
  border: 2px solid transparent;
  /* 仅过渡需要的属性，避免 transition:all 把 transform/box-shadow 等也做成过渡 */
  transition: background-color 0.1s, border-color 0.1s;
  background: transparent;
  padding: 0 1px;
}
.canvas-element:hover {
  background: var(--note-hover);
}
.canvas-element.selected {
  background: var(--note-selected);
  border-color: var(--accent-color);
}
.canvas-element.selected.multi-selected {
  background: var(--note-selected);
  border-color: var(--accent-color);
  box-shadow: 0 0 0 1px var(--accent-color);
}
.canvas-element.playing {
  background: var(--note-playing);
  border-color: var(--note-playing-border);
  /* 去掉模糊 box-shadow（每帧重绘光晕=脏区扩散到整块视口），
     改用纯 paint 高亮；contain+will-change 把动画锁在自身合成层，
     不再引发父容器重合成。note-bounce 动画保留。 */
  animation: note-bounce 0.15s ease-out;
  contain: layout style paint;
  will-change: transform;
}
.canvas-element.playing .note-solfege,
.canvas-element.playing .accidental-mark,
.canvas-element.playing .slide-mark {
  color: var(--note-playing-border);
}
.canvas-element.playing .rest-symbol {
  color: var(--note-playing-border);
}
/* 和弦谱音符列整体跳动 */
.note-col.playing {
  background: var(--note-playing);
  animation: note-bounce 0.15s ease-out;
  contain: layout style paint;
  will-change: transform;
}
.note-col.playing .note-solfege,
.note-col.playing .accidental-mark,
.note-col.playing .slide-mark {
  color: var(--note-playing-border);
}
.note-col.playing .rest-symbol {
  color: var(--note-playing-border);
}
@keyframes note-bounce {
  0% { transform: scale(1); }
  50% { transform: scale(1.12); }
  100% { transform: scale(1); }
}
.chord-label.playing {
  color: var(--note-playing-border);
  background: var(--note-playing);
  border-radius: 3px;
  padding: 1px 4px;
  animation: note-bounce 0.15s ease-out;
  contain: layout style paint;
  will-change: transform;
}
.canvas-element.drag-over-insert {
  border-left: 3px solid var(--drag-insert-line);
}
.canvas-element.drag-over-replace {
  background: var(--note-drag-over);
  border-color: var(--warning-color);
}
.canvas-element.dragging {
  opacity: 0.4;
}

/* 增时线占位元素（已废弃，增时线内置到音符中） */
.canvas-element.ext-line-element,
.canvas-element.dot-element {
  display: none;
}

/* 连音梁线（绝对定位在 beat-group 内） */
.beam-line {
  position: absolute;
  height: 2px;
  background: var(--text-primary);
  border-radius: 1px;
  pointer-events: none;
  z-index: 5;
}

/* 减时线占位（连音组内的不可见占位，保持垂直空间） */
.bottom-row.beam-spacer-row {
  background: transparent;
}

/* 音符核心显示 */
.note-core {
  display: flex;
  align-items: baseline;
}

.note-solfege {
  font-size: 22px;
  font-weight: 700;
  line-height: 1;
  color: var(--text-primary);
}

/* 升降号 */
.accidental-mark {
  font-size: 14px;
  font-weight: 700;
  color: var(--text-primary);
  margin-right: 1px;
}

/* 上滑音/下滑音弧形箭头 */
.slide-mark {
  display: inline-block;
  vertical-align: baseline;
  margin-right: 2px;
  flex-shrink: 0;
  color: var(--text-primary);
}

/* 连音弧线（SVG，绝对定位在容器内） */
.tie-arc-svg {
  overflow: visible;
}

/* 休止符 */
.rest-core {
  display: flex;
  align-items: baseline;
}
.rest-symbol {
  font-size: 22px;
  font-weight: 700;
  color: var(--text-secondary);
  line-height: 1;
}
.fixed-rest .rest-symbol {
  opacity: 0.4;
}

/* 小节线 - 基础容器（flex布局，子元素提供视觉） */
.barline-core {
  display: flex;
  align-items: center;
  gap: 2px;
  margin: 0 4px;
  position: relative;
  height: 30px;
}
/* 薄线（小节线基本线条） */
.barline-thin {
  width: 2px;
  height: 30px;
  background: var(--barline-color);
  flex-shrink: 0;
}
/* 两点（反复记号：上下两个圆点） */
.barline-dots {
  width: 4px;
  height: 30px;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 8px;
  flex-shrink: 0;
}
.barline-dots::before,
.barline-dots::after {
  content: '';
  display: block;
  width: 4px;
  height: 4px;
  border-radius: 50%;
  background: var(--barline-color);
}
/* 美元符（跳过记号，靠上方） */
.barline-skip-mark {
  font-size: 10px;
  font-weight: bold;
  color: var(--barline-color);
  align-self: flex-start;
  line-height: 1;
  flex-shrink: 0;
}
/* 段落括号标记 |A-|E（小节线右侧靠上方） */
.volta-label {
  align-self: flex-start;
  font-size: 10px;
  color: var(--barline-color);
  font-weight: bold;
  line-height: 1;
  white-space: nowrap;
}

/* 标识符列 */
.beat-col.marker-col {
  min-width: 28px;
}
.marker-col .col-top-reserve,
.marker-col .col-bottom {
  /* 标识符不需要八度圆点和减时线 */
}
/* 标识符核心 */
.marker-core {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 3px 4px;
  border-radius: 4px;
  line-height: 1.2;
}
.marker-symbol {
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0;
}
.marker-sub {
  font-size: 9px;
  font-weight: 400;
  opacity: 0.8;
}
/* 各类标识符配色 */
.marker-phrase .marker-symbol {
  color: #8B5CF6;
}
.marker-harmonic {
  background: #ECFDF5;
  border: 1px solid #A7F3D0;
}
.marker-harmonic .marker-symbol {
  color: #059669;
}
.marker-section {
  background: #EFF6FF;
  border: 1px solid #BFDBFE;
}
.marker-section .marker-symbol {
  color: #2563EB;
}
.marker-empty {
  background: #FFF7ED;
  border: 1px solid #FED7AA;
}
.marker-empty .marker-symbol {
  color: #C2410C;
}

/* 房子线行间距（有房子线的行需要更多顶部空间） */
.canvas-row.has-volta-bracket {
  padding-top: 24px;
}

/* 房子线SVG（绝对定位在canvas-row内） */
.volta-bracket-svg {
  position: absolute;
  left: 0;
  top: 0;
  pointer-events: none;
  z-index: 10;
  overflow: visible;
}

/* 终止线 - 使用列结构对齐 */
.endline-col {
  /* 继承 beat-col 样式 */
}
.endline-core {
  display: flex;
  align-items: center;
  gap: 2px;
  margin: 0 10px;
  position: relative;
  height: 30px;
}
.endline-thin {
  width: 2px;
  height: 30px;
  background: var(--endline-color);
  flex-shrink: 0;
}
.endline-thick {
  width: 5px;
  height: 30px;
  background: var(--endline-color);
  border-radius: 1px;
  flex-shrink: 0;
}
/* 终止线上的两点（反复结束终止线 :||） */
.endline-dots {
  width: 4px;
  height: 30px;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 8px;
  flex-shrink: 0;
}
.endline-dots::before,
.endline-dots::after {
  content: '';
  display: block;
  width: 4px;
  height: 4px;
  border-radius: 50%;
  background: var(--endline-color);
}
/* 终止线上的美元符（跳过结束终止线 %||，靠上方） */
.endline-skip-mark {
  font-size: 10px;
  font-weight: bold;
  color: var(--endline-color);
  align-self: flex-start;
  line-height: 1;
  flex-shrink: 0;
}

/* ===== 右侧：属性面板 ===== */
#property-panel {
  width: 180px;
  background: var(--bg-panel);
  border-left: 1px solid var(--border-color);
  overflow-y: auto;
  padding: 8px;
}

.prop-group {
  margin-bottom: 8px;
}
.prop-group > label {
  display: block;
  font-size: 11px;
  color: var(--text-muted);
  margin-bottom: 4px;
  font-weight: 600;
}

.prop-row {
  display: flex;
  gap: 4px;
  margin-bottom: 4px;
}

.prop-btn {
  flex: 1;
  padding: 5px 4px;
  border: 1px solid var(--border-color);
  border-radius: 4px;
  background: var(--bg-primary);
  color: var(--text-primary);
  font-size: 11px;
  cursor: pointer;
  transition: all 0.15s;
  text-align: center;
  white-space: nowrap;
}
.prop-btn:hover {
  background: var(--accent-light);
  border-color: var(--accent-color);
}
.prop-btn:active {
  background: var(--accent-color);
  color: #FFF;
}
.prop-btn.active {
  background: var(--accent-color);
  color: #FFF;
  border-color: var(--accent-color);
}
.prop-btn.danger {
  color: var(--error-color);
  border-color: rgba(196,30,58,0.3);
}
.prop-btn.danger:hover {
  background: var(--error-color);
  color: #FFF;
}
.prop-btn.action-btn {
  font-weight: 600;
}

.prop-slider-row {
  display: flex;
  align-items: center;
  gap: 4px;
  margin-bottom: 2px;
}
.prop-pos {
  width: 22px;
  font-size: 10px;
  color: var(--text-muted);
  text-align: right;
  flex-shrink: 0;
}
.prop-val {
  width: 24px;
  font-size: 10px;
  color: var(--text-primary);
  text-align: right;
  flex-shrink: 0;
}
.prop-hint {
  font-weight: normal;
  font-size: 9px;
  color: var(--text-muted);
}
.prop-divider {
  margin: 6px 0;
  border-top: 1px solid var(--border-color);
}
.anchor-slider {
  flex: 1;
  height: 4px;
  cursor: pointer;
}

#element-info {
  font-size: 11px;
  color: var(--text-secondary);
  line-height: 1.6;
  padding: 4px;
  background: var(--bg-primary);
  border-radius: 4px;
  min-height: 60px;
}
#element-info .info-row {
  display: flex;
  justify-content: space-between;
}
#element-info .info-label {
  color: var(--text-muted);
}

/* ===== 底部状态栏 ===== */
/* #editor-statusbar 不再使用，合并到主页 #statusbar */

/* ===== 拖拽幽灵 ===== */
.drag-ghost {
  position: fixed;
  pointer-events: none;
  z-index: 10000;
  padding: 4px 8px;
  background: var(--accent-light);
  border: 2px solid var(--accent-color);
  border-radius: 6px;
  font-size: 18px;
  font-weight: 700;
  color: var(--text-primary);
  opacity: 0.9;
  display: none;
}

/* ===== 滚动条美化 ===== */
#canvas-viewport::-webkit-scrollbar { width: 8px; height: 8px; }
#canvas-viewport::-webkit-scrollbar-track { background: rgba(0,0,0,0.05); border-radius: 4px; }
#canvas-viewport::-webkit-scrollbar-thumb { background: rgba(0,0,0,0.15); border-radius: 4px; }
#canvas-viewport::-webkit-scrollbar-thumb:hover { background: rgba(0,0,0,0.25); }

/* ===== 插入指示线 ===== */
.insert-indicator {
  position: absolute;
  width: 3px;
  background: var(--accent-color);
  border-radius: 2px;
  z-index: 100;
  pointer-events: none;
  animation: pulse-indicator 0.8s ease-in-out infinite alternate;
}
@keyframes pulse-indicator {
  from { opacity: 0.6; }
  to { opacity: 1; }
}

/* ===== 打印样式：白纸缩放回A4标准尺寸 ===== */
@media print {
  #editor-toolbar,
  #editor-statusbar,
  .editor-sub-toolbar {
    display: none !important;
  }
  #canvas-section {
    overflow: visible;
    padding: 0;
  }
  #canvas-viewport {
    overflow: visible;
    padding: 0;
    background: #fff;
    box-shadow: none;
    border-radius: 0;
    display: block;
  }
  #canvas-scroll {
    width: 1134px !important;
    min-height: 1603px !important;
    box-shadow: none;
    border-radius: 0;
  }
  #jianpu-canvas {
    /* 字号缩放：zoom将内容缩放回A4实际尺寸 */
    zoom: var(--font-scale, 1) !important;
  }
  .canvas-element.selected {
    background: transparent;
    border-color: transparent;
  }
  .canvas-element.playing {
    background: transparent;
    border-color: transparent;
    box-shadow: none;
    animation: none;
  }
  .canvas-element.playing .note-solfege,
  .canvas-element.playing .accidental-mark,
  .canvas-element.playing .slide-mark,
  .canvas-element.playing .rest-symbol {
    color: var(--text-primary);
  }
  .note-col.playing {
    background: transparent;
    animation: none;
  }
  .note-col.playing .note-solfege,
  .note-col.playing .accidental-mark,
  .note-col.playing .slide-mark,
  .note-col.playing .rest-symbol {
    color: var(--text-primary);
  }
  .canvas-drop-zone.cursor-active::before {
    display: none;
  }
}

/* ===== 箫演奏编辑器样式（拍对齐布局） ===== */

/* 箫演奏编辑区主容器 */
.xiao-editor-area {
  flex: 1;
  display: flex;
  flex-direction: column;
  overflow: hidden;
  padding: 8px;
}

.xiao-editor-area .editor-main-area {
  flex: 1;
  display: flex;
  overflow: hidden;
  gap: 8px;
}

/* 画布区域（含上下分区+splitter） */
#xiao-canvas-section {
  flex: 1;
  display: flex;
  flex-direction: column;
  overflow: hidden;
  background: var(--bg-secondary);
  border-radius: 6px;
}

/* 上半区：主渲染区（去掉下半区预留后占满整个画布区，轨道动态填满） */
.xiao-top-panel {
  flex: 1;
  min-height: 100px;
  overflow: hidden;
  display: flex;
  flex-direction: column;
}

/* 画布视口（水平+垂直滚动，高度由 xiao-top-panel 控制） */
#xiao-canvas-viewport {
  flex: 1;
  overflow: auto;
  background: transparent;
  padding: 0;
}

#xiao-canvas-scroll {
  position: relative;
}

#xiao-canvas {
  position: relative;
  padding: 0;
  min-width: 0;
}

/* ===== 5分区轨道布局（高度由JS固定，不跟随父容器） ===== */
.xiao-tracks {
  position: relative;
  width: max-content;
  flex-shrink: 0;  /* 不被flex压缩，内容超出panel高度时触发垂直滚动 */
}

.xiao-track {
  position: relative;
  white-space: nowrap;
  overflow: hidden;
}

/* 1. 时间尺 */
.xiao-track-ruler {
  background: #f5f0e8;
  border-bottom: 1px solid #d0c8b8;
}
.ruler-line {
  position: absolute;
  bottom: 0;
}
.ruler-line-32 {
  width: 1px;
  height: 4px;
  background: #b0a890;
}
.ruler-line-beat {
  width: 1px;
  height: 10px;
  background: #6b6050;
}
.ruler-line-measure {
  display: none; /* 旧样式，已移到跨越参考线 */
}
.ruler-label {
  position: absolute;
  font-size: 9px;
  color: #6b6050;
  top: 2px;
  white-space: nowrap;
}
.ruler-label-beat {
  font-size: 8px;
  top: 12px;
  color: #8a7f6a;
}
.ruler-label-measure {
  font-size: 10px;
  font-weight: bold;
  color: #2c1810;
}

/* 2. 音量控制线 */
.xiao-track-volume {
  background: #fef2f0;
  border-bottom: 1px solid #e8d5d0;
}
.xiao-volume-line {
  position: absolute;
  top: 50%;
  height: 1px;
  background: #c0b8a8;
}

/* 3. 音色控制线 */
.xiao-track-timbre {
  background: #eff6ff;
  border-bottom: 1px solid #d0dbe8;
}
.xiao-timbre-line {
  position: absolute;
  top: 50%;
  height: 1px;
  background: #c0b8a8;
}

/* 4. 音频波纹 */
.xiao-track-waveform {
  background: #f0fdf4;
  border-bottom: 1px solid #d0e8d5;
}

/* 5. 和弦 */
.xiao-track-chord {
  background: #f9f5ff;
  border-bottom: 1px solid #ddd0e8;
  overflow: visible;
}
.xiao-chord-block {
  background: transparent;
  border: none;
}
.xiao-chord-block.playing-chord {
  background: rgba(92, 61, 110, 0.25);
  border-radius: 4px;
  outline: 2px solid rgba(92, 61, 110, 0.5);
  contain: layout style paint;
}
.xiao-chord-symbol {
  flex-shrink: 0;
}
.xiao-chord-tones {
  flex-shrink: 0;
  opacity: 0.8;
}

/* 6. 简谱音符 */
.xiao-track-jianpu {
  background: #faf8f5;
}

/* 轨道标签 */
.xiao-track-label {
  position: absolute;
  left: 4px;
  top: 2px;
  font-size: 10px;
  color: var(--text-muted);
  z-index: 5;
  background: rgba(255,255,255,0.7);
  padding: 1px 4px;
  border-radius: 2px;
}

/* 简谱轨道内音符列 */
.xiao-track-jianpu .xiao-note-el {
  top: 0;
  bottom: 0;
}

/* 减时线梁（在简谱轨道内绝对定位） */
.xiao-track-jianpu .beam-line {
  position: absolute;
  height: 2px;
  background: var(--text-primary);
  border-radius: 1px;
  pointer-events: none;
  z-index: 5;
}

/* 属性面板 */
#xiao-property-panel {
  width: 220px;
  min-width: 200px;
  background: var(--bg-panel);
  border-left: 1px solid var(--border-color);
  overflow-y: auto;
  padding: 8px;
}

/* 箫演奏面板顶部工具条（撤销/重做/多选） */
.xiao-panel-toolbar {
  display: flex;
  flex-wrap: wrap;
  gap: 4px;
  margin-bottom: 8px;
  padding-bottom: 8px;
  border-bottom: 1px solid var(--border-color);
}
.xiao-panel-toolbar .toolbar-btn {
  flex: 1 1 auto;
  justify-content: center;
}

/* 箫演奏设置面板 */
.xiao-perf-settings {
  font-size: 12px;
}
.xiao-perf-settings .fx-label {
  display: block;
  margin: 4px 0 2px;
  font-size: 11px;
}
.xiao-perf-settings .fx-toggle {
  display: block;
  margin: 4px 0;
  font-size: 12px;
}
.xiao-perf-settings input[type="range"] {
  width: 100%;
  margin: 0;
}
.xiao-perf-settings .fx-divider {
  height: 1px;
  background: var(--border-color);
  margin: 6px 0;
}

/* 箫演奏行（单行无限延伸，不换行） */
.xiao-row {
  position: relative;
  min-height: 90px;
  padding: 12px 0;
  margin-bottom: 16px;
  white-space: nowrap;
}

/* 小节容器（固定宽度，拍对齐） */
.xiao-measure {
  position: relative;
  min-height: 80px;
  flex-shrink: 0;
}

/* 拍线背景（每拍一个浅色区域，拍间间隙透明） */
.xiao-beat-bg {
  position: absolute;
  top: 0;
  bottom: 0;
  background: rgba(139, 69, 19, 0.03);
  border-left: 1px dashed rgba(139, 69, 19, 0.08);
  pointer-events: none;
  z-index: 0;
}

/* 音符列（绝对定位，流式布局） */
.xiao-note-el {
  position: absolute;
  top: 0;
  bottom: 0;
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  z-index: 1;
}
.xiao-note-el.selected {
  background: rgba(255, 228, 181, 0.35);
  outline: 1px solid var(--accent-color);
  z-index: 2;
}
.xiao-note-el.selected.multi-selected {
  outline: 1px solid var(--accent-color);
}
.xiao-note-el.playing {
  background: rgba(179, 229, 252, 0.3);
  outline: 1px solid var(--note-playing-border);
  z-index: 2;
  contain: layout style paint;
  will-change: transform;
}
/* 所有装饰中心轴 = 前一个音符刻度 + 11px（半格），即 22px 宽容器的中心 */
.xiao-note-el .col-top-reserve,
.xiao-note-el .col-middle,
.xiao-note-el .col-bottom {
  width: 22px;
  padding: 0; /* 清除全局padding，避免中心偏移 */
}
.xiao-note-el .bottom-row {
  width: 22px;
  min-width: auto;
}
.xiao-note-el .low-dot-row {
  width: 22px;
  min-width: auto;
}

/* 标记符列（绝对定位） */
.xiao-marker-el {
  position: absolute;
  top: 0;
  bottom: 0;
  display: flex;
  flex-direction: column;
  align-items: center;
  z-index: 1;
}

/* 小节线/终止线列（绝对定位） */
.xiao-barline-el {
  position: absolute;
  top: 0;
  bottom: 0;
  display: flex;
  flex-direction: column;
  align-items: center;
  z-index: 1;
}

/* 箫演奏标记（滑音等，显示在音符上方） */
.xiao-perf-mark {
  font-size: 14px;
  font-weight: 700;
  line-height: 1;
  margin-top: 2px;
}
.xiao-perf-mark.xiao-slide-up {
  color: #C2410C;
}
.xiao-perf-mark.xiao-slide-down {
  color: #2563EB;
}

/* 装饰音标记（叠/打/波/颤，音符正上方） */
.xiao-ornament {
  font-size: 10px;
  font-weight: 700;
  line-height: 1;
  margin-top: 1px;
  color: var(--accent-color, #8B4513);
  white-space: nowrap;
}
.xiao-ornament-svg {
  display: block;
}

/* 增时线（独立定位，在下一拍位置，字符宽度） */
.xiao-ext-line {
  position: absolute;
  top: 38px; /* 对齐唱名中线：col-top-reserve(26px) + col-middle中心(12px) */
  height: 2px;
  background: var(--text-primary);
  border-radius: 1px;
}

/* 二声部编辑器音符列内增时线（在col-middle中，flex垂直居中对齐唱名中线） */
.xiao-ext-line-mark {
  width: 20px;
  height: 2px;
  background: var(--text-primary);
  border-radius: 1px;
}

/* 选中覆盖层：半透明高亮标注选中音符时间范围 */
.xiao-selection-overlay {
  position: absolute;
  top: 0;
  background: rgba(255, 228, 181, 0.25);
  border-left: 1px solid rgba(200, 140, 60, 0.5);
  border-right: 1px solid rgba(200, 140, 60, 0.5);
  pointer-events: none;
  z-index: 3;
}

/* 小节参考线：跨越5轨道，从顶贯穿到底 */
.xiao-measure-ref-line {
  position: absolute;
  top: 0;
  width: 1px;
  background: rgba(139, 69, 19, 0.18);
  pointer-events: none;
  z-index: 0;
}

/* 箫演奏附点标记 */
.xiao-dot-mark {
  display: inline-block;
  width: 5px;
  height: 5px;
  border-radius: 50%;
  background: var(--text-primary);
  margin-left: 1px;
  vertical-align: middle;
  flex-shrink: 0;
}

/* 小节线/终止线列在箫演奏中复用 beat-col 样式 */
.xiao-row .beat-col.barline-col,
.xiao-row .beat-col.endline-col {
  flex-shrink: 0;
  min-width: 36px;
}