/* 演奏练习模块 · 与主站主题一致 */
.pf-module {
  width: 100%;
  font-family: "Fredoka", "Segoe UI", sans-serif;
}

.pf-instrument-tabs {
  display: flex;
  gap: 8px;
  margin-bottom: 16px;
  flex-wrap: wrap;
  justify-content: center;
}

.pf-tab {
  font-family: inherit;
  font-size: 0.88rem;
  font-weight: 600;
  padding: 10px 14px;
  border: 2.5px solid #e8e0ff;
  border-radius: 50px;
  background: #fff;
  color: #3d3a50;
  cursor: pointer;
  transition: transform 0.15s, border-color 0.15s, background 0.15s, color 0.15s;
  flex: 1;
  min-width: 100px;
  text-align: center;
}

.pf-tab:hover { transform: scale(1.03); border-color: #7c5cff; }
.pf-tab.active {
  background: linear-gradient(135deg, #7c5cff, #5a3fd4);
  border-color: #5a3fd4;
  color: #fff;
  box-shadow: 0 4px 14px rgba(124, 92, 255, 0.25);
}

.pf-info-bar {
  background: linear-gradient(135deg, #f5f0ff, #fff8ee);
  border: 2px dashed #ddd0ff;
  border-radius: 14px;
  padding: 14px 18px;
  margin-bottom: 16px;
  text-align: center;
}

.pf-info-mode {
  font-size: 0.75rem;
  font-weight: 600;
  color: #7c5cff;
  letter-spacing: 0.04em;
  margin-bottom: 6px;
}

.pf-info-main {
  font-size: 1.15rem;
  font-weight: 700;
  color: #3d3a50;
  margin-bottom: 4px;
}

.pf-info-sub {
  font-size: 0.85rem;
  color: #7a7590;
}

.pf-info-feedback {
  margin-top: 8px;
  font-size: 0.9rem;
  font-weight: 600;
  color: #e89420;
  min-height: 1.2em;
}

.pf-panel { display: none; }
.pf-panel.active { display: block; }

/* ── 钢琴 ── */
.pf-piano-controls {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 12px;
  margin-bottom: 14px;
}

.pf-oct-btn {
  font-family: inherit;
  width: 36px;
  height: 36px;
  border: 2px solid #7c5cff;
  border-radius: 50%;
  background: #fff;
  color: #7c5cff;
  font-size: 1.2rem;
  font-weight: 700;
  cursor: pointer;
  transition: transform 0.15s, background 0.15s;
}

.pf-oct-btn:hover:not(:disabled) {
  transform: scale(1.08);
  background: #f5f0ff;
}

.pf-oct-btn:disabled { opacity: 0.35; cursor: default; }

.pf-oct-label {
  font-size: 0.95rem;
  font-weight: 600;
  color: #3d3a50;
  min-width: 72px;
  text-align: center;
}

.pf-keyboard {
  position: relative;
  height: 140px;
  margin: 0 auto 12px;
  max-width: 420px;
  user-select: none;
}

.pf-keys-black {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 58%;
  z-index: 2;
  pointer-events: none;
}

.pf-keys-black .pf-key-black {
  pointer-events: auto;
}

.pf-keys-white {
  display: flex;
  height: 100%;
  gap: 2px;
}

.pf-key-white {
  flex: 1;
  background: #fff;
  border: 2px solid #ccc;
  border-radius: 0 0 8px 8px;
  cursor: pointer;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: flex-end;
  padding-bottom: 8px;
  transition: transform 0.1s, background 0.1s;
  position: relative;
  z-index: 1;
}

.pf-key-white:hover { transform: scaleY(1.02); background: #faf8ff; }
.pf-key-white.active { background: #e8deff; transform: scaleY(0.98); border-color: #7c5cff; }

.pf-key-black {
  position: absolute;
  width: 9%;
  height: 58%;
  background: #333;
  border: 2px solid #111;
  border-radius: 0 0 6px 6px;
  cursor: pointer;
  z-index: 2;
  display: flex;
  align-items: flex-end;
  justify-content: center;
  padding-bottom: 4px;
  transition: transform 0.1s, background 0.1s;
}

.pf-key-black:hover { transform: scale(1.05); background: #444; }
.pf-key-black.active { background: #7c5cff; border-color: #5a3fd4; transform: scale(0.96); }

.pf-key-label {
  font-size: 0.65rem;
  font-weight: 600;
  color: #7a7590;
}

.pf-key-black .pf-key-label { color: #ccc; font-size: 0.55rem; }

.pf-key-note {
  font-size: 0.7rem;
  font-weight: 700;
  color: #5a3fd4;
  margin-bottom: 2px;
}

.pf-key-black .pf-key-note { color: #e8deff; }

.pf-hint {
  text-align: center;
  font-size: 0.78rem;
  color: #7a7590;
  line-height: 1.5;
}

/* ── 吉他 ── */
.pf-guitar-neck {
  background: #faf8ff;
  border: 2px solid #ece6ff;
  border-radius: 14px;
  padding: 16px;
  margin-bottom: 14px;
}

.pf-guitar-neck h4 {
  font-size: 0.85rem;
  color: #7c5cff;
  margin-bottom: 10px;
  text-align: center;
}

.pf-strings {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.pf-string-row {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 0.85rem;
  color: #3d3a50;
}

.pf-string-name {
  font-weight: 700;
  color: #5a3fd4;
  min-width: 28px;
}

.pf-string-line {
  flex: 1;
  height: 2px;
  background: linear-gradient(90deg, #7c5cff, #ddd0ff);
  border-radius: 2px;
}

.pf-chord-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 10px;
  margin-bottom: 14px;
}

.pf-chord-btn {
  font-family: inherit;
  font-size: 0.9rem;
  font-weight: 700;
  padding: 14px 8px;
  border: 2.5px solid #e8e0ff;
  border-radius: 14px;
  background: #fff;
  color: #3d3a50;
  cursor: pointer;
  transition: transform 0.15s, border-color 0.15s, box-shadow 0.15s;
}

.pf-chord-btn:hover {
  transform: scale(1.04);
  border-color: #7c5cff;
  box-shadow: 0 4px 12px rgba(124, 92, 255, 0.18);
}

.pf-chord-btn.active {
  background: #e8deff;
  border-color: #7c5cff;
  transform: scale(0.97);
}

.pf-chord-btn kbd {
  display: block;
  font-size: 0.7rem;
  color: #7a7590;
  font-weight: 500;
  margin-top: 4px;
}

.pf-toggle-row {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  margin-bottom: 12px;
}

.pf-toggle {
  font-family: inherit;
  font-size: 0.85rem;
  font-weight: 600;
  padding: 8px 18px;
  border: 2px solid #e8e0ff;
  border-radius: 50px;
  background: #fff;
  color: #7a7590;
  cursor: pointer;
  transition: transform 0.15s, background 0.15s, color 0.15s;
}

.pf-toggle:hover { transform: scale(1.03); }
.pf-toggle.on {
  background: linear-gradient(135deg, #ffb347, #e89420);
  border-color: #e89420;
  color: #fff;
}

/* ── 架子鼓 ── */
.pf-drum-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 12px;
  margin-bottom: 14px;
}

.pf-drum-pad {
  font-family: inherit;
  aspect-ratio: 1;
  border: none;
  border-radius: 16px;
  cursor: pointer;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  color: #fff;
  font-weight: 700;
  font-size: 0.82rem;
  position: relative;
  overflow: hidden;
  transition: transform 0.12s;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.12);
}

.pf-drum-pad:hover { transform: scale(1.06); }
.pf-drum-pad.hit { transform: scale(0.92); }

.pf-drum-pad kbd {
  font-size: 0.68rem;
  opacity: 0.85;
  margin-top: 4px;
  font-weight: 500;
}

.pf-drum-pad::after {
  content: "";
  position: absolute;
  inset: 0;
  border-radius: inherit;
  background: radial-gradient(circle, rgba(255,255,255,0.45) 0%, transparent 65%);
  opacity: 0;
  transform: scale(0.3);
  pointer-events: none;
}

.pf-drum-pad.ripple::after {
  animation: pf-ripple 0.45s ease-out;
}

@keyframes pf-ripple {
  0%   { opacity: 1; transform: scale(0.3); }
  100% { opacity: 0; transform: scale(1.4); }
}

.pf-drum-kick  { background: linear-gradient(145deg, #5a3fd4, #7c5cff); grid-column: span 1; }
.pf-drum-snare { background: linear-gradient(145deg, #e8650a, #ffb347); }
.pf-drum-hihat { background: linear-gradient(145deg, #4cd964, #2a9d4e); }
.pf-drum-crash { background: linear-gradient(145deg, #ff6b6b, #d94040); }
.pf-drum-ride  { background: linear-gradient(145deg, #e89420, #ffd080); color: #3d3a50; }
.pf-drum-tom   { background: linear-gradient(145deg, #5a3fd4, #9b7cff); }

.pf-actions {
  text-align: center;
  margin-top: 8px;
}

.pf-back-btn {
  font-family: inherit;
  font-size: 0.95rem;
  font-weight: 700;
  color: #7c5cff;
  background: #fff;
  border: 2px solid #7c5cff;
  border-radius: 50px;
  padding: 12px 28px;
  cursor: pointer;
  transition: transform 0.15s, background 0.15s;
}

.pf-back-btn:hover {
  transform: translateY(-2px);
  background: #f5f0ff;
}

.pf-back-btn.hidden { display: none; }

@media (max-width: 400px) {
  .pf-chord-grid { grid-template-columns: repeat(2, 1fr); }
  .pf-keyboard { height: 120px; }
}