/* ═══════════════════════════════════════════
   PIANO — floating button + modal
═══════════════════════════════════════════ */

/* ─── Floating button ─── */
#piano-btn {
  position: fixed;
  bottom: 5.5rem; right: 1.5rem;
  z-index: 500;
  width: 50px; height: 50px;
  border-radius: 50%;
  background: var(--bg-card);
  border: 1.5px solid var(--border);
  font-size: 1.4rem;
  display: flex; align-items: center; justify-content: center;
  box-shadow: var(--shadow-md);
  transition: transform var(--transition), box-shadow var(--transition), border-color var(--transition);
  animation: pianoPulse 3s 3s ease infinite;
}
#piano-btn:hover {
  transform: scale(1.12) rotate(-8deg);
  border-color: var(--accent);
  box-shadow: 0 0 0 6px rgba(0,200,150,.12), var(--shadow-md);
  animation: none;
}
@keyframes pianoPulse {
  0%,100% { box-shadow: var(--shadow-md); }
  50%      { box-shadow: 0 0 0 8px rgba(0,200,150,.1), var(--shadow-md); }
}

/* ─── Modal backdrop ─── */
#piano-modal {
  position: fixed; inset: 0; z-index: 2000;
  background: rgba(0,0,0,.6);
  backdrop-filter: blur(14px);
  display: flex; align-items: center; justify-content: center;
  padding: 1rem;
  opacity: 0; visibility: hidden;
  transition: opacity .3s ease, visibility .3s ease;
}
#piano-modal.open { opacity: 1; visibility: visible; }

/* ─── Modal box ─── */
.piano-box {
  background: #0e1422;
  border: 1px solid rgba(255,255,255,.08);
  border-radius: var(--radius);
  padding: 1.6rem 1.8rem 1.8rem;
  width: 100%;
  max-width: 920px;
  transform: translateY(20px) scale(0.98);
  transition: transform .3s cubic-bezier(0.23,1,0.32,1);
  box-shadow: 0 40px 80px rgba(0,0,0,.6), 0 0 0 1px rgba(255,255,255,.04);
}
#piano-modal.open .piano-box { transform: translateY(0) scale(1); }

/* ─── Header ─── */
.piano-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 1.2rem;
}
.piano-title { font-size: 1.1rem; }

.piano-sustain-ind {
  font-family: var(--font-mono);
  font-size: .68rem;
  letter-spacing: .08em;
  text-transform: uppercase;
  color: rgba(255,255,255,.22);
  background: rgba(255,255,255,.05);
  border: 1px solid rgba(255,255,255,.08);
  border-radius: 4px;
  padding: .22rem .6rem;
  transition: color .2s, background .2s, border-color .2s;
}
.piano-sustain-ind.active {
  color: #5ecfa0;
  background: rgba(94,207,160,.1);
  border-color: rgba(94,207,160,.35);
  box-shadow: 0 0 10px rgba(94,207,160,.2);
}

.piano-close {
  color: rgba(255,255,255,.3);
  font-size: 1.1rem;
  line-height: 1;
  transition: color .2s;
}
.piano-close:hover { color: #fff; }

/* ─── Visualizer canvas ─── */
#piano-viz {
  display: block;
  width: 100%;
  border-radius: 10px;
  margin-bottom: 1.2rem;
  background: #080c1c;
}

/* ─── Keys wrapper ─── */
.piano-keys {
  position: relative;
  height: 168px;
  display: flex;
  user-select: none;
  border-radius: 0 0 8px 8px;
  overflow: hidden;
  box-shadow: 0 8px 24px rgba(0,0,0,.5);
}

/* ─── White keys ─── */
.key-white {
  flex: 1;
  background: linear-gradient(180deg, #f0ece0 0%, #e4dfd0 100%);
  border-right: 1px solid #c8c0b0;
  border-bottom: 4px solid #a8a090;
  border-radius: 0 0 6px 6px;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: flex-end;
  padding-bottom: .4rem;
  gap: 1px;
  position: relative;
  cursor: pointer;
  transition: background .05s;
}
.key-white:last-child { border-right: none; }

.key-white:hover {
  background: linear-gradient(180deg, #e8f5ee 0%, #d8ede4 100%);
}
.key-white.pressed {
  background: linear-gradient(180deg,
    hsl(var(--hue), 55%, 80%) 0%,
    hsl(var(--hue), 60%, 74%) 100%);
  border-bottom-color: hsl(var(--hue), 45%, 60%);
  box-shadow: inset 0 -3px 6px rgba(0,0,0,.15),
              0 0 14px hsl(var(--hue), 70%, 60%, .5);
}

/* C-note dot marker */
.key-white[data-c]::after {
  content: '';
  position: absolute;
  bottom: 1.8rem;
  left: 50%;
  transform: translateX(-50%);
  width: 5px; height: 5px;
  border-radius: 50%;
  background: rgba(0,0,0,.18);
}

/* ─── Key labels ─── */
.key-note {
  font-family: var(--font-sans);
  font-size: .58rem;
  font-weight: 700;
  color: rgba(0,0,0,.38);
  line-height: 1;
}
.key-white.pressed .key-note { color: hsl(var(--hue), 60%, 28%); }

.key-kbd {
  font-family: var(--font-mono);
  font-size: .4rem;
  color: rgba(0,0,0,.22);
  line-height: 1;
}

/* ─── Black keys ─── */
.key-black {
  position: absolute;
  width: 5.4%;
  height: 61%;
  background: linear-gradient(180deg, #1c1c2e 0%, #0d0d18 70%, #141420 100%);
  border: 1px solid rgba(255,255,255,.06);
  border-bottom: 4px solid #000;
  border-radius: 0 0 5px 5px;
  top: 0; z-index: 2;
  display: flex; align-items: flex-end; justify-content: center;
  padding-bottom: .3rem;
  cursor: pointer;
  transition: background .05s;
}
.key-black:hover {
  background: linear-gradient(180deg, #252536 0%, #141422 70%, #1a1a28 100%);
}
.key-black.pressed {
  background: linear-gradient(180deg,
    hsl(var(--hue), 55%, 28%) 0%,
    hsl(var(--hue), 50%, 18%) 100%);
  box-shadow: 0 0 12px hsl(var(--hue), 70%, 45%, .6);
  border-bottom-color: hsl(var(--hue), 40%, 10%);
}
.key-black .key-kbd {
  font-family: var(--font-mono);
  font-size: .38rem;
  color: rgba(255,255,255,.28);
}

/* ─── Hint ─── */
.piano-hint {
  margin-top: .9rem;
  font-family: var(--font-mono);
  font-size: .68rem;
  color: rgba(255,255,255,.2);
  text-align: center;
}
.piano-hint span { color: rgba(255,255,255,.4); }

/* ─── Responsive ─── */
@media (max-width: 700px) {
  .piano-keys  { height: 120px; }
  .piano-box   { padding: 1rem .8rem 1.2rem; }
  .key-note    { font-size: .5rem; }
  .key-kbd     { display: none; }
  #piano-viz   { height: 180px !important; }
  #piano-btn   { bottom: 5rem; right: 1rem; width: 44px; height: 44px; font-size: 1.2rem; }
}