/* 钢琴和弦表 /tools/piano_chords —— 响应式样式
 *
 * 两种形态（同一份 DOM，靠 CSS 切换）：
 *   宽度 ≥1200px  -> 12 调 × 5 类和弦的完整矩阵（宽屏一览）
 *   宽度 <1200px  -> 按「调」分组的卡片流（手机 / 平板无需左右滑动）
 */
body[data-page="piano_chords"] .app { max-width: 100%; }
body[data-page="piano_chords"] .main-content { max-width: 100%; width: 100%; border-right: 0; }

.pc-page {
  max-width: 100%;
  margin: 0 auto;
  padding: 28px 24px 72px;
  box-sizing: border-box;
}

/* 顶部标题 */
.pc-hero { text-align: center; margin-bottom: 20px; }
.pc-title {
  font-size: 30px;
  font-weight: 800;
  letter-spacing: .5px;
  margin: 0 0 8px;
  background: linear-gradient(90deg, #2563eb, #0ea5e9 60%, #14b8a6);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}
.pc-sub { max-width: 720px; margin: 0 auto 10px; color: var(--text-secondary); font-size: 15px; line-height: 1.7; }
.pc-related { font-size: 13px; color: var(--text-secondary); }
.pc-related a { color: var(--accent, #1d9bf0); text-decoration: none; }
.pc-related a:hover { text-decoration: underline; }

/* 控制条：左右两端与表格边缘对齐 */
.pc-controls {
  display: flex; flex-wrap: wrap; gap: 12px;
  align-items: center; justify-content: space-between;
  margin: 0 0 16px; max-width: none;
}
.pc-seg {
  display: inline-flex; background: var(--bg-secondary, #f1f3f7);
  border: 1px solid var(--border-color, #e2e6ee); border-radius: 12px; padding: 4px;
}
.pc-seg-btn {
  border: 0; background: transparent; cursor: pointer;
  padding: 8px 18px; border-radius: 9px; font-size: 14px; font-weight: 700;
  color: var(--text-secondary); transition: .15s;
}
.pc-seg-btn.is-active { background: var(--accent, #1d9bf0); color: #fff; box-shadow: 0 2px 8px rgba(29,155,240,.3); }
.pc-actions { display: inline-flex; gap: 10px; }
.pc-btn {
  border: 1px solid var(--border-color, #e2e6ee); background: var(--bg-secondary, #f1f3f7);
  color: var(--text-primary); cursor: pointer;
  padding: 9px 16px; border-radius: 10px; font-size: 14px; font-weight: 700; transition: .15s;
  box-sizing: border-box; min-width: 0;
}
.pc-btn:hover { border-color: var(--accent, #1d9bf0); color: var(--accent, #1d9bf0); }
/* 触控目标与键盘可达性 */
.pc-cell, .pc-btn, .pc-seg-btn { touch-action: manipulation; }
.pc-cell:focus-visible, .pc-btn:focus-visible, .pc-seg-btn:focus-visible {
  outline: 2px solid var(--accent, #1d9bf0); outline-offset: 2px;
}

/* ===== 音色 / 音效选择 ===== */
.pc-sound {
  display: inline-flex; align-items: center; gap: 10px;
  flex-wrap: wrap;
}
.pc-sound-group {
  display: inline-flex; align-items: center; gap: 6px;
  background: var(--bg-secondary, #f1f3f7);
  border: 1px solid var(--border-color, #e2e6ee); border-radius: 12px;
  padding: 4px 10px;
}
.pc-sound-label {
  font-size: 13px; font-weight: 700; color: var(--text-secondary);
  white-space: nowrap; user-select: none;
}
.pc-sound-sel {
  appearance: none; -webkit-appearance: none;
  border: 0; background: transparent; cursor: pointer;
  font-size: 14px; font-weight: 700; color: var(--text-primary);
  padding: 4px 22px 4px 6px; border-radius: 8px;
  background-image: url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 12 12'><path d='M2 4l4 4 4-4' fill='none' stroke='%2364748b' stroke-width='1.6' stroke-linecap='round'/></svg>");
  background-repeat: no-repeat; background-position: right 6px center;
}
.pc-sound-sel:hover { background-color: rgba(29,155,240,.08); }
.pc-sound-sel:focus-visible { outline: 2px solid var(--accent, #1d9bf0); outline-offset: 1px; }
.pc-sound-sel option { color: #111827; background: #fff; }

/* 极简设置按钮 + 弹出面板 */
.pc-settings { position: relative; display: inline-block; }
.pc-settings-btn { display: inline-flex; align-items: center; gap: 6px; }
.pc-gear { font-size: 15px; line-height: 1; transform: translateY(.5px); }
.pc-settings-pop {
  position: absolute; right: 0; top: calc(100% + 8px); z-index: 60;
  min-width: 232px; padding: 14px 16px;
  background: var(--bg-card, #fff); border: 1px solid var(--border-color, #e3e6ef);
  border-radius: 14px; box-shadow: 0 14px 36px rgba(20,30,60,.18);
}
.pc-settings-pop[hidden] { display: none; }
.pc-set-row {
  display: flex; align-items: center; justify-content: space-between;
  gap: 12px; margin-bottom: 12px;
}
.pc-set-row:last-child { margin-bottom: 0; }
.pc-set-label { font-size: 13px; font-weight: 700; color: var(--text-secondary); white-space: nowrap; }
.pc-set-range { width: 130px; accent-color: var(--accent, #1d9bf0); }
.pc-set-row-foot { justify-content: flex-start; gap: 12px; }
.pc-set-hint { font-size: 12px; color: #2a9d57; }
.pc-btn-mini { padding: 5px 12px; font-size: 12px; min-width: 0; }

/* ===== 和弦表：矩阵形态（宽屏） ===== */
.pc-chart-wrap { overflow-x: auto; padding-bottom: 8px; -webkit-overflow-scrolling: touch; }
.pc-grid {
  --pc-hw: 56px;          /* 调名列宽 */
  --pc-gap: 10px;
  --pc-cell-min: 132px;   /* 单元格最小宽度 */
  --pc-cell-max: 300px;   /* 单元格最大宽度：宽屏尽量铺满，超宽屏下不被过度拉伸 */
  display: flex; flex-direction: column; gap: var(--pc-gap);
  min-width: 0;
}
.pc-head, .pc-root {
  display: grid;
  grid-template-columns: var(--pc-hw) repeat(5, minmax(var(--pc-cell-min), var(--pc-cell-max)));
  gap: var(--pc-gap);
  justify-content: center;   /* 超宽屏时整体居中，不拉散 */
}
/* 并回父级网格：让每个调的 5 个格子落在同一行的 5 列上 */
.pc-cells { display: contents; }
.pc-corner { }
.pc-col-h {
  font-size: 12.5px; font-weight: 800; color: var(--text-secondary);
  text-align: center; align-self: end; padding-bottom: 4px;
}
.pc-row-h {
  font-size: 15px; font-weight: 800; color: var(--text-primary);
  display: flex; align-items: center; justify-content: center;
}
.pc-row-name { display: inline-flex; align-items: center; }
.pc-cell {
  display: flex; flex-direction: column; align-items: center; gap: 6px;
  padding: 7px 6px 6px; border: 1px solid var(--border-color, #e2e6ee);
  border-radius: 12px;
  background: linear-gradient(180deg,
    color-mix(in srgb, var(--accent, #1d9bf0) 6%, var(--bg-secondary, #f1f3f7)),
    var(--bg-secondary, #f1f3f7));
  cursor: pointer; min-width: 0;
  transition: transform .12s ease, border-color .15s ease, box-shadow .15s ease;
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, .05);
}
.pc-cell:hover {
  border-color: color-mix(in srgb, var(--accent, #1d9bf0) 55%, var(--border-color, #e2e6ee));
  box-shadow: 0 8px 20px rgba(29, 155, 240, .18), inset 0 1px 0 rgba(255, 255, 255, .08);
  transform: translateY(-2px);
}
.pc-cell:active { transform: translateY(-1px) scale(.985); }
.pc-cell.flash { animation: pcflash .36s ease; }
@keyframes pcflash {
  0% {
    background: color-mix(in srgb, var(--accent, #1d9bf0) 22%, var(--bg-secondary, #f1f3f7));
    box-shadow: 0 0 0 2px color-mix(in srgb, var(--accent, #1d9bf0) 45%, transparent);
  }
  100% {}
}
.pc-cell-name { font-size: 13.5px; font-weight: 800; color: var(--text-primary); letter-spacing: .4px; }

/* ===== 迷你键盘：拟真琴键（键床 + 红绒条 + 玻璃高光） ===== */
.pc-kb, .pc-ref-kb, .pc-cd-kb {
  /* 琴体（外框 / 底部厚度 / 投影） */
  --pc-frame: rgba(0, 0, 0, .55);
  --pc-lip: rgba(0, 0, 0, .4);
  --pc-cast: rgba(0, 0, 0, .34);
  --pc-felt-a: #c0392b;
  --pc-felt-b: #6f1a12;
  /* 白键：顶亮 → 中段 → 底部收暗，模拟象牙键的弧面 */
  --pc-wk-a: #ffffff;
  --pc-wk-b: #f6f9fc;
  --pc-wk-c: #dbe3ee;
  --pc-wk-line: rgba(100, 116, 139, .5);
  /* 黑键：上棱提亮 → 主体 → 底部压深 */
  --pc-bk-a: #5c6774;
  --pc-bk-b: #262f3a;
  --pc-bk-c: #0a0f16;
  /* 和弦音高亮：蓝宝石渐变 + 外发光 */
  --pc-on-a: #a7d1ff;
  --pc-on-b: #3b82f6;
  --pc-on-c: #1d4ed8;
  --pc-on-glow: rgba(59, 130, 246, .62);
  position: relative;
  border-radius: 5px 5px 7px 7px;
  background: linear-gradient(180deg, #232b36, #161c24);
  box-shadow: 0 0 0 1px var(--pc-frame), 0 3px 0 var(--pc-lip), 0 8px 18px var(--pc-cast);
}
/* 注意：.pc-kb 是 .pc-cell（flex + align-items:center）的子项，
   必须显式 width:100%，否则会收缩为 0 宽导致琴键完全不可见。 */
.pc-kb { width: 100%; height: 52px; }
.pc-ref-kb { width: 100%; height: 68px; }
/* 单个和弦页的大键盘 */
.pc-cd-kb { width: 100%; height: 172px; }

/* 琴体顶部红绒条（压在键顶之上，最上层） */
.pc-kb::before, .pc-ref-kb::before, .pc-cd-kb::before {
  content: ''; position: absolute; left: 0; right: 0; top: 0; height: 3px;
  background: linear-gradient(180deg, var(--pc-felt-a), var(--pc-felt-b));
  border-radius: 5px 5px 0 0; z-index: 4;
  box-shadow: 0 1px 2px rgba(0, 0, 0, .35);
}
/* 键面玻璃高光 */
.pc-kb::after, .pc-ref-kb::after, .pc-cd-kb::after {
  content: ''; position: absolute; left: 0; right: 0; top: 0; bottom: 0;
  border-radius: inherit; pointer-events: none; z-index: 3;
  background: linear-gradient(180deg, rgba(255, 255, 255, .26), rgba(255, 255, 255, 0) 46%);
}

/* 白键：竖向渐变 + 底部厚度 + 细键缝 */
.pc-wk, .pc-ref-wk {
  position: absolute; top: 0; height: 100%; width: calc(100% / 15);
  box-sizing: border-box; border: 0; border-radius: 0 0 4px 4px;
  background: linear-gradient(180deg, var(--pc-wk-a) 0%, var(--pc-wk-b) 58%, var(--pc-wk-c) 100%);
  box-shadow: inset -1px 0 0 var(--pc-wk-line),
              inset 0 -1px 0 rgba(100, 116, 139, .45),
              inset 0 -6px 8px -4px rgba(15, 23, 42, .3);
  transition: background .14s ease, box-shadow .14s ease, filter .14s ease;
}

/* 黑键：上棱高光 + 投影 + 圆角 */
.pc-bk, .pc-ref-bk {
  position: absolute; top: 0; height: 62%; width: calc(100% / 15 * 0.62);
  transform: translateX(-50%); border-radius: 0 0 3px 3px; z-index: 2;
  background: linear-gradient(180deg, var(--pc-bk-a) 0%, var(--pc-bk-b) 52%, var(--pc-bk-c) 100%);
  box-shadow: 0 3px 5px rgba(0, 0, 0, .5),
              inset 0 1px 0 rgba(255, 255, 255, .24),
              inset 0 -3px 4px rgba(0, 0, 0, .45);
  transition: background .14s ease, box-shadow .14s ease, filter .14s ease;
}

/* 和弦音高亮 */
.pc-wk.on {
  background: linear-gradient(180deg, var(--pc-on-a) 0%, var(--pc-on-b) 52%, var(--pc-on-c) 100%);
  box-shadow: inset -1px 0 0 rgba(29, 78, 216, .7),
              inset 0 -1px 0 rgba(29, 78, 216, .85),
              inset 0 -6px 9px -4px rgba(15, 23, 42, .35),
              0 0 10px var(--pc-on-glow);
  z-index: 1;
}
.pc-bk.on {
  background: linear-gradient(180deg, var(--pc-on-a) 0%, var(--pc-on-b) 52%, var(--pc-on-c) 100%);
  box-shadow: 0 3px 6px rgba(0, 0, 0, .5), 0 0 11px var(--pc-on-glow),
              inset 0 1px 0 rgba(255, 255, 255, .45),
              inset 0 -3px 5px rgba(15, 23, 42, .4);
}

/* 试听闪烁：琥珀色脉冲环 */
.pc-wk.lit, .pc-bk.lit {
  box-shadow: inset 0 0 0 2px rgba(255, 255, 255, .9),
              0 0 0 2px #fbbf24, 0 0 16px rgba(251, 191, 36, .9);
  filter: brightness(1.15);
  animation: pcpulse .3s ease;
}
@keyframes pcpulse { 0% { filter: brightness(1.55); } 100% { filter: brightness(1.15); } }

/* ===== 琴键对照 ===== */
.pc-ref { max-width: 760px; margin: 34px auto 0; }
.pc-ref-title { font-size: 17px; font-weight: 800; text-align: center; margin: 0 0 14px; }
.pc-ref-wk span {
  position: absolute; bottom: 4px; left: 0; right: 0; text-align: center;
  font-size: 11px; font-weight: 700; color: #64748b;
}
.pc-ref-bk span {
  position: absolute; bottom: 3px; left: 0; right: 0; text-align: center;
  font-size: 8.5px; font-weight: 600; line-height: 1.1; color: #cbd5e1;
}
.pc-ref-note { text-align: center; font-size: 12.5px; color: var(--text-secondary); margin-top: 18px; }

/* 说明区块 */
.pc-sec { max-width: 820px; margin: 40px auto 0; }
.pc-sec h2 { font-size: 20px; font-weight: 800; margin: 0 0 12px; }
.pc-sec p { color: var(--text-secondary); line-height: 1.8; margin: 0 0 12px; }
.pc-list { color: var(--text-secondary); line-height: 1.95; padding-left: 22px; }
.pc-list li { margin: 4px 0; }
.pc-list b { color: var(--text-primary); }
.pc-cards { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 14px; margin-top: 16px; }
.pc-card {
  background: var(--bg-secondary, #f1f3f7); border: 1px solid var(--border-color, #e2e6ee);
  border-radius: 14px; padding: 16px; font-size: 13.5px; color: var(--text-secondary); line-height: 1.7;
}
.pc-card-ico { font-size: 22px; display: block; margin-bottom: 6px; }
.pc-card b { color: var(--text-primary); }
.pc-faq details { border: 1px solid var(--border-color, #e2e6ee); border-radius: 10px; padding: 4px 14px; margin: 8px 0; background: var(--bg-secondary, #f1f3f7); }
.pc-faq summary { cursor: pointer; font-weight: 700; color: var(--text-primary); padding: 8px 0; }
.pc-faq details p { margin: 0 0 10px; }

/* toast */
.pc-toast {
  position: fixed; left: 50%; bottom: 28px; transform: translateX(-50%);
  background: #111827; color: #fff; padding: 10px 18px; border-radius: 10px;
  font-size: 13.5px; z-index: 120000; box-shadow: 0 8px 28px rgba(0,0,0,.28);
}

/* 浅色主题：琴体与投影更轻（键面渐变保持不变） */
[data-theme="light"] .pc-kb, [data-theme="light"] .pc-ref-kb, [data-theme="light"] .pc-cd-kb {
  --pc-frame: rgba(148, 163, 184, .6);
  --pc-lip: rgba(148, 163, 184, .5);
  --pc-cast: rgba(15, 23, 42, .16);
  --pc-wk-line: rgba(148, 163, 184, .6);
  background: linear-gradient(180deg, #eef2f8, #dbe3ee);
}

/* ============================================================
 * 窄屏（手机 / 平板）：改为「按调分组」的卡片流，取消左右滑动
 * ============================================================ */
@media (max-width: 1199px) {
  .pc-head { display: none; }          /* 列标题隐藏：每张卡片自带和弦名 */
  .pc-chart-wrap { overflow: visible; }
  .pc-grid { gap: 0; }

  .pc-root {
    display: block;
    padding: 0 0 16px;
    margin-bottom: 16px;
    border-bottom: 1px solid var(--border-color, #e2e6ee);
  }
  .pc-root:last-child { border-bottom: 0; margin-bottom: 0; padding-bottom: 0; }

  .pc-row-h { justify-content: flex-start; font-size: 15.5px; margin-bottom: 10px; }
  .pc-row-name::before {
    content: ''; width: 4px; height: 15px; border-radius: 2px;
    margin-right: 8px; background: var(--accent, #1d9bf0);
  }
  .pc-row-name::after {
    content: '调'; margin-left: 6px;
    font-size: 12px; font-weight: 600; color: var(--text-secondary);
  }

  .pc-cells {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 10px;
  }
  .pc-cell { padding: 8px 7px 7px; }
}

/* 平板横屏 / 窄笔记本：每行放 3 张卡片 */
@media (min-width: 900px) and (max-width: 1199px) {
  .pc-cells { grid-template-columns: repeat(3, minmax(0, 1fr)); }
  .pc-page { padding: 24px 20px 64px; }
}

/* 说明卡片：窄屏两列 */
@media (max-width: 899px) {
  .pc-cards { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}

/* ============================================================
 * 手机：单列更紧凑，控件变成整行大按钮
 * ============================================================ */
@media (max-width: 640px) {
  .pc-page { padding: 18px 12px 48px; }
  .pc-hero { margin-bottom: 16px; }
  .pc-title { font-size: 23px; }
  .pc-sub { font-size: 14px; line-height: 1.65; }
  .pc-related { font-size: 12px; }

  .pc-controls { flex-direction: column; align-items: stretch; gap: 10px; margin-bottom: 14px; }
  .pc-seg { display: flex; width: 100%; }
  .pc-seg-btn { flex: 1; padding: 11px 8px; min-width: 0; }
  .pc-sound { width: 100%; }
  .pc-sound-group { flex: 1; justify-content: space-between; }
  .pc-sound-sel { flex: 1; }
  .pc-actions { display: grid; grid-template-columns: 1fr 1fr; gap: 10px; width: 100%; }
  .pc-btn { padding: 13px 10px; text-align: center; width: 100%; display: block; min-width: 0; }

  .pc-cells { grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 8px; }
  .pc-cell { border-radius: 10px; gap: 5px; }
  .pc-cell-name { font-size: 12.5px; }
  .pc-kb { height: 48px; }
  .pc-root { padding-bottom: 14px; margin-bottom: 14px; }
  .pc-row-h { font-size: 15px; margin-bottom: 8px; }

  .pc-ref { margin-top: 26px; }
  .pc-ref-title { font-size: 15px; margin-bottom: 10px; }
  .pc-ref-kb { height: 60px; }
  .pc-ref-wk span { font-size: 8.5px; }
  .pc-ref-bk span { font-size: 6.5px; }
  .pc-ref-note { font-size: 11.5px; margin-top: 14px; }

  .pc-cards { grid-template-columns: 1fr; gap: 10px; }
  .pc-sec { margin-top: 28px; }
  .pc-sec h2 { font-size: 17px; }
  .pc-card { padding: 13px; font-size: 13px; }
  .pc-toast { bottom: 18px; max-width: calc(100% - 24px); text-align: center; }
}

/* 说明卡片：手机单列（≤560 兼容旧断点） */
@media (max-width: 560px) {
  .pc-cards { grid-template-columns: 1fr; }
}

/* 设置面板在窄屏避免溢出视口 */
@media (max-width: 560px) {
  .pc-settings-pop { right: auto; left: 0; width: min(280px, 86vw); }
}

/* ============================================================
 * 打印：一律回到 12×5 矩阵，并建议横向纸张
 * ============================================================ */
@media print {
  @page { size: A4 landscape; margin: 10mm; }
  .pc-hero, .pc-controls, .pc-ref, .pc-sec, .pc-related, .pc-toast { display: none !important; }
  .pc-page { max-width: 100%; padding: 0; }
  .pc-chart-wrap { overflow: visible; }
  .pc-head { display: grid !important; }
  .pc-root { display: grid !important; padding: 0 !important; margin: 0 !important; border: 0 !important; }
  .pc-cells { display: contents !important; }
  .pc-grid { --pc-hw: 38px; --pc-gap: 6px; --pc-cell-min: 0px; --pc-cell-max: 1fr; gap: 6px; }
  .pc-row-name::before, .pc-row-name::after { display: none !important; }
  .pc-row-h { justify-content: center; margin: 0; font-size: 13px; }
  .pc-col-h { font-size: 11px; }
  .pc-cell { break-inside: avoid; padding: 5px 4px 4px; border-radius: 8px; }
  .pc-cell-name { font-size: 11.5px; }
  .pc-kb { height: 44px; }
  /* 打印时保留琴键的渐变与蓝色高亮 */
  .pc-cell, .pc-kb, .pc-ref-kb, .pc-cd-kb, .pc-wk, .pc-bk { -webkit-print-color-adjust: exact; print-color-adjust: exact; }
  /* 单个和弦页：只留键盘与正文 */
  .pc-viewswitch, .pc-cd-pickers, .pc-cd-playbar, .pc-cd-posnav, .pc-cd-finger-note, .pc-idx-wrap { display: none !important; }
  .pc-cd-tool { border: 0; padding: 0; background: transparent; }
}

/* ============================================================
 * 单个和弦页 /tools/piano_chords/<slug>
 * （复刻 vocalrangetest.org/zh/piano-chords/{slug} 的版式）
 * ============================================================ */
.pc-cd-head {
  display: flex; align-items: center; justify-content: space-between;
  gap: 12px; flex-wrap: wrap; margin-bottom: 12px;
}
.pc-cd-title { font-size: 30px; font-weight: 800; margin: 0; color: var(--text-primary); letter-spacing: .3px; }

/* 视图切换：完整图表 / 单个和弦 */
.pc-viewswitch {
  display: inline-flex; gap: 4px; padding: 4px;
  background: var(--bg-secondary, #f1f3f7);
  border: 1px solid var(--border-color, #e2e6ee); border-radius: 999px;
}
.pc-viewswitch-center { display: inline-flex; margin: 12px auto 10px; }
.pc-vs-btn {
  padding: 7px 16px; border-radius: 999px; font-size: 13.5px; font-weight: 700;
  color: var(--text-secondary); text-decoration: none; white-space: nowrap; transition: .15s;
}
.pc-vs-btn:hover { color: var(--accent, #1d9bf0); }
.pc-vs-btn.is-active { background: var(--accent, #1d9bf0); color: #fff; box-shadow: 0 2px 8px rgba(29,155,240,.3); }

/* 工具区 */
.pc-cd-tool {
  border: 1px solid var(--border-color, #e2e6ee);
  border-radius: 16px; padding: 18px 18px 20px;
  background: var(--bg-secondary, #f1f3f7);
}
.pc-cd-posdesc { margin: 0 0 14px; color: var(--text-secondary); font-size: 14px; line-height: 1.7; }
.pc-cd-kbwrap { padding-bottom: 6px; }

/* 大键盘上的音名 */
.pc-cd-kb .pc-wk span,
.pc-cd-kb .pc-bk span { position: absolute; left: 0; right: 0; text-align: center; }
.pc-cd-kb .pc-wk span { bottom: 6px; font-size: 13px; font-weight: 700; color: #64748b; }
.pc-cd-kb .pc-bk span { bottom: 5px; font-size: 9.5px; font-weight: 600; line-height: 1.1; color: #cbd5e1; }
.pc-cd-kb .pc-wk.on span, .pc-cd-kb .pc-bk.on span { color: #f2f7ff; }

.pc-cd-notes { text-align: center; margin: 16px 0 14px; font-size: 15px; color: var(--text-primary); }
.pc-cd-notes b { color: var(--text-secondary); font-weight: 700; margin-right: 4px; }

/* 播放条 */
.pc-cd-playbar { display: flex; align-items: center; justify-content: center; gap: 12px; margin-bottom: 14px; }
.pc-btn-primary {
  background: var(--accent, #1d9bf0); border-color: var(--accent, #1d9bf0); color: #fff;
  display: inline-flex; align-items: center; gap: 6px;
}
.pc-btn-primary:hover { background: var(--accent-hover, #1a8cd8); border-color: var(--accent-hover, #1a8cd8); color: #fff; }
.pc-play-ico { font-size: 11px; }

/* 把位切换 */
.pc-cd-posnav { display: flex; align-items: center; justify-content: center; gap: 14px; margin-bottom: 18px; }
.pc-cd-arrow {
  width: 34px; height: 34px; border-radius: 50%; cursor: pointer;
  border: 1px solid var(--border-color, #e2e6ee); background: var(--bg-primary, #fff);
  color: var(--text-primary); font-size: 18px; line-height: 1;
}
.pc-cd-arrow:hover:not(:disabled) { border-color: var(--accent, #1d9bf0); color: var(--accent, #1d9bf0); }
.pc-cd-arrow:disabled { opacity: .4; cursor: not-allowed; }
.pc-cd-poslabel { font-size: 14.5px; font-weight: 700; color: var(--text-primary); }
.pc-cd-posname { margin-left: 6px; font-style: normal; font-weight: 700; color: var(--accent, #1d9bf0); }

/* 指法 */
.pc-cd-fingers { text-align: center; margin-bottom: 18px; }
.pc-cd-fingers-title { font-size: 13px; font-weight: 700; color: var(--accent, #1d9bf0); margin-bottom: 10px; }
.pc-cd-hands { display: flex; gap: 14px; justify-content: center; flex-wrap: wrap; }
.pc-cd-hand {
  border: 1px solid var(--border-color, #e2e6ee); border-radius: 12px;
  background: var(--bg-primary, #fff); padding: 12px 14px 8px; min-width: 148px;
}
.pc-cd-fingerbar { display: flex; align-items: flex-end; justify-content: center; gap: 6px; height: 62px; }
.pc-finger {
  position: relative; width: 14px; border-radius: 8px 8px 4px 4px;
  background: var(--border-color, #e2e6ee); transition: background .15s, box-shadow .15s;
}
.pc-finger i {
  position: absolute; top: -9px; left: 50%; transform: translateX(-50%);
  font-style: normal; font-size: 11px; font-weight: 700; color: var(--text-secondary);
}
.pc-finger.on { background: linear-gradient(180deg, #a7d1ff, #3b82f6 60%, #1d4ed8); box-shadow: 0 0 8px rgba(59,130,246,.55); }
.pc-finger.on i { color: var(--accent, #1d9bf0); }
.pc-cd-hand-cap { margin-top: 18px; font-size: 13px; color: var(--text-secondary); }
.pc-cd-hand-cap b { color: var(--text-primary); }
.pc-cd-finger-note { margin: 12px 0 0; font-size: 12.5px; color: var(--text-secondary); }

/* 根音 / 和弦类型选择器 */
.pc-cd-pick-label { font-size: 13px; font-weight: 700; color: var(--text-secondary); margin: 14px 0 8px; }
.pc-cd-chips { display: flex; flex-wrap: wrap; gap: 8px; }
.pc-chip {
  display: inline-flex; align-items: center; justify-content: center;
  min-width: 44px; padding: 8px 13px; border-radius: 10px;
  border: 1px solid var(--border-color, #e2e6ee); background: var(--bg-primary, #fff);
  color: var(--text-primary); font-size: 13.5px; font-weight: 700; text-decoration: none;
  transition: background .15s, border-color .15s, color .15s;
}
.pc-chip:hover { border-color: var(--accent, #1d9bf0); color: var(--accent, #1d9bf0); }
.pc-chip.is-active { background: var(--accent, #1d9bf0); border-color: var(--accent, #1d9bf0); color: #fff; }
.pc-chip.is-disabled { opacity: .42; cursor: not-allowed; background: var(--bg-secondary, #f1f3f7); }

/* 长文与索引表 */
.pc-cd-sec { margin-top: 34px; }
.pc-cd-sec h2 { font-size: 21px; }
.pc-cd-h3 { font-size: 16px; font-weight: 800; margin: 20px 0 8px; color: var(--text-primary); }
.pc-steps li { margin: 10px 0; }
.pc-related-label { margin: 14px 0 8px; font-size: 13px; color: var(--text-secondary); }
.pc-related-label b { color: var(--text-primary); }

.pc-idx-wrap { overflow-x: auto; margin-top: 6px; }
.pc-idx { border-collapse: collapse; min-width: 680px; width: 100%; }
.pc-idx th, .pc-idx td { border: 1px solid var(--border-color, #e2e6ee); padding: 6px 8px; text-align: center; font-size: 13px; }
.pc-idx thead th { background: var(--bg-secondary, #f1f3f7); color: var(--text-secondary); font-weight: 700; }
.pc-idx tbody th { background: var(--bg-secondary, #f1f3f7); color: var(--text-primary); font-weight: 800; }
.pc-idx a { color: var(--accent, #1d9bf0); text-decoration: none; font-weight: 700; }
.pc-idx a:hover { text-decoration: underline; }

/* 单和弦页三端适配 */
@media (max-width: 899px) {
  .pc-cd-title { font-size: 25px; }
  .pc-cd-tool { padding: 14px 13px 16px; }
  .pc-cd-kb { height: 132px; }
  .pc-cd-kb .pc-wk span { font-size: 11px; }
  .pc-cd-kb .pc-bk span { font-size: 8px; }
}
@media (max-width: 640px) {
  .pc-cd-head { flex-direction: column; align-items: stretch; }
  .pc-cd-title { font-size: 22px; }
  .pc-viewswitch { display: flex; width: 100%; }
  .pc-vs-btn { flex: 1; text-align: center; }
  .pc-cd-kb { height: 106px; }
  .pc-cd-kb .pc-wk span { font-size: 9.5px; }
  .pc-cd-kb .pc-bk span { font-size: 6.5px; }
  .pc-cd-playbar { flex-direction: column; align-items: stretch; }
  .pc-cd-playbar .pc-seg { display: flex; width: 100%; }
  .pc-cd-playbar .pc-seg-btn { flex: 1; padding: 11px 8px; }
  .pc-sound-cd { width: 100%; }
  .pc-sound-cd .pc-sound-group { flex: 1; justify-content: space-between; }
  .pc-sound-cd .pc-sound-sel { flex: 1; }
  .pc-btn-primary { justify-content: center; padding: 12px 10px; }
  .pc-cd-hand { min-width: 130px; padding: 10px 10px 6px; }
  .pc-cd-fingerbar { height: 54px; gap: 5px; }
  .pc-finger { width: 12px; }
  .pc-chip { padding: 8px 11px; font-size: 13px; }
  .pc-cd-sec { margin-top: 26px; }
  .pc-cd-sec h2 { font-size: 18px; }
}