/* 钢琴组件样式 —— 自包含、随容器尺寸自适应。所有类名以 piano- 前缀，避免与宿主 app 冲突。 */
.piano {
  --piano-bg: #fffdf8;
  --piano-panel: #ffffff;
  --piano-border: #e8ddca;
  --piano-text: #3a342b;
  --piano-text-soft: #9a8f7c;
  --piano-accent: #c0894b;

  --white: #fcfbf7;
  --white-edge: #d8cdb6;
  --white-active: #f2dfb6;
  --white-text: #8a7f68;
  --black-top: #423a30;
  --black-bottom: #211c16;
  --black-active: #c0894b;

  position: relative;
  display: flex;
  flex-direction: column;
  width: 100%;
  height: 100%;
  min-height: 0;
  box-sizing: border-box;
  gap: clamp(6px, 1.5vmin, 12px);
  padding: clamp(6px, 1.6vmin, 14px);
  background: var(--piano-bg);
  color: var(--piano-text);
  font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Microsoft YaHei",
    "Segoe UI", Roboto, sans-serif;
  -webkit-user-select: none;
  user-select: none;
  -webkit-touch-callout: none;
  -webkit-tap-highlight-color: transparent;
}

.piano *,
.piano *::before,
.piano *::after {
  box-sizing: border-box;
}

/* 深色主题：宿主在 .piano 或其祖先加 [data-theme="dark"] 即可 */
.piano[data-theme="dark"],
[data-theme="dark"] .piano {
  --piano-bg: #14130f;
  --piano-panel: #1f1d17;
  --piano-border: #2f2b22;
  --piano-text: #f1ead9;
  --piano-text-soft: #93897a;
  --piano-accent: #d8b074;

  --white: #efe9dc;
  --white-edge: #c6bca6;
  --white-active: #d8b074;
  --white-text: #5a5240;
  --black-top: #39332a;
  --black-bottom: #14110c;
  --black-active: #d8b074;
}

/* ---------- 顶栏 ---------- */
.piano-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
  flex-wrap: wrap;
  flex: 0 0 auto;
}

.piano-readout {
  display: flex;
  align-items: baseline;
  gap: 8px;
  min-width: 0;
}

.piano-note {
  font-size: clamp(16px, 2.6vmin, 22px);
  font-weight: 700;
  letter-spacing: 0.5px;
}

.piano-freq {
  font-size: clamp(11px, 1.8vmin, 13px);
  color: var(--piano-text-soft);
}

.piano-tools {
  display: flex;
  align-items: center;
  gap: 6px;
}

.piano-btn {
  min-width: 40px;
  height: 36px;
  padding: 0 12px;
  border: 1px solid var(--piano-border);
  border-radius: 11px;
  background: var(--piano-panel);
  color: var(--piano-text);
  font-size: 14px;
  font-weight: 600;
  cursor: pointer;
  transition: transform 0.08s ease, background 0.15s ease, border-color 0.15s ease;
}

.piano-btn:active {
  transform: scale(0.93);
  background: var(--white-active);
  border-color: var(--piano-accent);
}

.piano-range {
  min-width: 50px;
  color: var(--piano-accent);
}

/* ---------- 音区滑动条（独立一行） ---------- */
.piano-range-slider-wrap {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr) auto;
  align-items: center;
  gap: 8px;
  flex: 0 0 auto;
  padding: 0 2px;
}

.piano-slider-label {
  color: var(--piano-text-soft);
  font-size: 12px;
  font-weight: 700;
  white-space: nowrap;
}

.piano-range-slider {
  width: 100%;
  height: 34px;
  margin: 0;
  accent-color: var(--piano-accent);
  touch-action: pan-x;
  cursor: pointer;
}

/* ---------- 键盘窗口（固定） ---------- */
.piano-keys {
  position: relative;
  flex: 1 1 auto;
  min-height: 0;
  padding: 8px 6px 0;
  border-radius: 12px;
  background: linear-gradient(180deg, var(--piano-border), color-mix(in srgb, var(--piano-border) 70%, #000 6%));
  box-shadow: inset 0 2px 7px rgba(0, 0, 0, 0.18);
  touch-action: none;
  overflow: hidden;
}

/* 完整长键盘轨道（只渲染一次，靠 transform 平移） */
.piano-key-strip {
  position: relative;
  display: flex;
  align-items: stretch;
  height: 100%;
  will-change: transform;
  transform: translate3d(0, 0, 0);
  --white-key-width: 52px;
}

/* 白键 */
.pk-w {
  position: relative;
  flex: 0 0 var(--white-key-width, 52px);
  width: var(--white-key-width, 52px);
  min-width: 0;
  display: flex;
  align-items: flex-end;
  justify-content: center;
  padding-bottom: clamp(6px, 1.6vmin, 12px);
  border: 1px solid var(--white-edge);
  border-top: none;
  border-radius: 0 0 7px 7px;
  background: linear-gradient(180deg, #ffffff 0%, var(--white) 92%);
  color: var(--white-text);
  font-size: clamp(9px, 1.5vmin, 13px);
  font-weight: 600;
}

.pk-w + .pk-w {
  border-left: none;
}

.pk-w.is-on {
  background: linear-gradient(180deg, var(--white-active), var(--white-active));
  color: var(--piano-text);
}

/* 黑键（绝对定位，left 由 JS 以 px 给出） */
.pk-b {
  position: absolute;
  top: 8px;
  width: calc(var(--white-key-width, 52px) * 0.62);
  height: 60%;
  transform: translateX(-50%);
  display: flex;
  align-items: flex-end;
  justify-content: center;
  padding-bottom: 6px;
  border-radius: 0 0 5px 5px;
  background: linear-gradient(180deg, var(--black-top) 0%, var(--black-bottom) 100%);
  color: #e9dcc2;
  font-size: clamp(8px, 1.2vmin, 11px);
  font-weight: 600;
  box-shadow: 0 3px 4px rgba(0, 0, 0, 0.45);
  z-index: 3;
}

.pk-b.is-on {
  background: linear-gradient(180deg, var(--black-active), var(--black-active));
  color: #211c16;
}

.pk-label {
  pointer-events: none;
  opacity: 0.82;
}

.pk-label.is-off {
  display: none;
}

/* 中央 C 标记 */
.pk-w.is-c4::after {
  content: "";
  position: absolute;
  bottom: 4px;
  left: 50%;
  transform: translateX(-50%);
  width: 5px;
  height: 5px;
  border-radius: 50%;
  background: var(--piano-accent);
}

/* ---------- 提示 ---------- */
.piano-hint {
  flex: 0 0 auto;
  margin: 0;
  text-align: center;
  font-size: 12px;
  color: var(--piano-accent);
}