.practice-topbar {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: 16px;
  margin-bottom: 20px;
}

.practice-title {
  font-size: 28px;
  font-weight: 800;
  margin: 0;
}

.practice-subtitle {
  color: var(--color-text-tertiary);
  margin-top: 8px;
  font-size: 14px;
}

.practice-staff-card,
.practice-keyboard-card {
  background: white;
  border: 1px solid var(--color-border);
  border-radius: 24px;
  padding: 18px;
  box-shadow: var(--shadow-sm);
}

.practice-staff-card {
  margin-top: 8px;
}

.staff-meta {
  display: flex;
  gap: 12px;
  margin-bottom: 12px;
  flex-wrap: wrap;
}
.staff-meta-item {
  background: var(--color-bg-secondary);
  border: 1px solid var(--color-border);
  border-radius: 14px;
  padding: 10px 12px;
  display: flex;
  gap: 8px;
  align-items: baseline;
}
.staff-meta-item .label {
  font-size: 12px;
  color: var(--color-text-tertiary);
}
.staff-meta-item .value {
  font-size: 13px;
  font-weight: 700;
}

.staff-stage {
  min-height: 220px;
  border-radius: 18px;
  border: 1px dashed var(--color-border-lighter);
  background: linear-gradient(180deg, #fff, #fafafa);
  display: grid;
  place-items: center;
  padding: 12px;
}
.staff-placeholder {
  color: var(--color-text-tertiary);
  font-size: 14px;
}

.staff-simple {
  width: 100%;
  max-width: 720px;
  display: grid;
  gap: 10px;
  justify-items: center;
}
.staff-simple .pitch {
  font-size: 64px;
  font-weight: 900;
  letter-spacing: 0.02em;
}
.staff-simple .hint {
  font-size: 13px;
  color: var(--color-text-tertiary);
}

/* 五线谱未加载时的友好提示：小字号、弱化样式，不抢眼 */
.staff-simple.staff-fallback-hint {
  padding: 24px 16px;
  text-align: center;
}
.staff-simple.staff-fallback-hint .pitch {
  font-size: 14px;
  font-weight: 500;
  color: var(--color-text-tertiary, #64748B);
  letter-spacing: normal;
}
.staff-simple.staff-fallback-hint .hint {
  font-size: 12px;
  color: var(--color-text-tertiary, #94A3B8);
  margin-top: 4px;
}

@media (max-width: 768px) {
  .staff-simple.staff-fallback-hint .pitch {
    font-size: 13px;
  }
  .staff-simple.staff-fallback-hint .hint {
    font-size: 11px;
  }
}

.practice-keyboard-card {
  margin-top: 16px;
}

.practice-feedback-row {
  margin-top: 14px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
}

.practice-feedback {
  flex: 1;
  min-height: 44px;
  display: flex;
  align-items: center;
  padding: 12px 14px;
  border-radius: 16px;
  border: 1px solid var(--color-border);
  background: var(--color-bg-secondary);
  color: var(--color-text-secondary);
}

.practice-feedback.is-correct {
  border-color: rgba(16, 185, 129, 0.35);
  background: rgba(16, 185, 129, 0.10);
  color: #065f46;
}
.practice-feedback.is-incorrect {
  border-color: rgba(239, 68, 68, 0.35);
  background: rgba(239, 68, 68, 0.10);
  color: #7f1d1d;
}

/* Keyboard：3 行 7 列布局（C~B / 降号 / 升号）- 白色弹窗风格 */
.note-answer-keyboard {
  display: flex;
  flex-direction: column;
  gap: 6px;
}
.keyboard-row {
  display: flex;
  gap: 6px;
  justify-content: center;
}
.note-key {
  flex: 1;
  min-width: 0;
  height: 50px;
  border-radius: 999px;
  background: #FFFFFF;
  border: 1px solid #E5E7EB;
  display: grid;
  place-items: center;
  user-select: none;
  cursor: pointer;
  transition: all 0.15s ease;
  padding: 6px 10px;
}
.note-key:hover:not(:disabled) {
  background: #EFF6FF;
  border-color: #BFDBFE;
}
.note-key.pressed {
  transform: scale(0.97);
}
.note-key.selected {
  background: #3B82F6;
  border-color: #2563EB;
  color: #FFFFFF;
}
.note-key.selected .key-letter,
.note-key.selected .key-accidental {
  color: #FFFFFF;
}
.key-content {
  display: inline-flex;
  align-items: center;
  gap: 2px;
}
.key-letter {
  font-size: 15px;
  font-weight: 600;
  color: #111827;
}
.key-accidental {
  font-size: 12px;
  font-weight: 500;
  color: #6B7280;
}

.note-key.correct {
  background: rgba(16, 185, 129, 0.12);
  border-color: rgba(16, 185, 129, 0.55);
}
.note-key.correct .key-letter,
.note-key.correct .key-accidental {
  color: #166534;
}
.note-key.incorrect {
  background: rgba(239, 68, 68, 0.12);
  border-color: rgba(239, 68, 68, 0.55);
}
.note-key.incorrect .key-letter,
.note-key.incorrect .key-accidental {
  color: #B91C1C;
}

@media (max-width: 768px) {
  .keyboard-row {
    gap: 6px;
  }
  .note-key {
    height: 44px;
    padding: 6px 8px;
  }
  .key-letter {
    font-size: 14px;
  }
  .key-accidental {
    font-size: 11px;
  }
  .staff-simple .pitch {
    font-size: 52px;
  }
}

/* Rhythm & Rest 键盘：文字较长，改为多行自适应 */
.rhythm-rest-keyboard .keyboard-row {
  gap: 8px;
}
.rhythm-rest-keyboard .note-key {
  height: auto;
  min-height: 44px;
  padding: 6px 6px;
}
.rhythm-rest-keyboard .key-content {
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  white-space: normal;
  line-height: 1.4;
}
.rhythm-rest-keyboard .key-letter {
  font-size: 14px;
  font-weight: 600;
}