*,*::before,*::after{margin:0;padding:0;box-sizing:border-box}

:root{
  --bg:#f0f0f3;
  --card:#fff;
  --border:#e0e0e5;
  --text:#1d1d1f;
  --text-muted:#86868b;
  --accent:#0071e3;
  --key-scale:1;
}

html{-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale}

body{
  font-family:-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,Helvetica,Arial,sans-serif;
  background:var(--bg);
  color:var(--text);
  height:100dvh;
  display:flex;flex-direction:column;
  overflow:hidden;
  position:relative;
}

.rotate-prompt{
  display:none;
  position:fixed;inset:0;z-index:9999;
  background:var(--bg);
  flex-direction:column;align-items:center;justify-content:center;
  gap:.8rem;
}
.rotate-prompt p{font-size:1rem;font-weight:500;color:var(--text-muted)}
.rotate-icon{font-size:3rem;color:var(--text-muted);animation:spin 2s linear infinite}
@keyframes spin{from{transform:rotate(0deg)}to{transform:rotate(360deg)}}

@media(orientation:portrait) and (max-width:768px){
  .rotate-prompt{display:flex}
  body>*:not(.rotate-prompt){display:none}
}

.top-bar{
  position:absolute;top:0;left:0;right:0;
  display:flex;flex-wrap:wrap;justify-content:center;align-items:flex-start;
  gap:.4rem .8rem;
  padding:.4rem .8rem;
  z-index:10;
}

.control-group{
  display:flex;flex-direction:column;align-items:center;gap:.15rem;
}

.control-group select{
  appearance:none;
  padding:.3rem .6rem .3rem .4rem;
  border:1px solid var(--border);border-radius:8px;
  background:var(--card);color:var(--text);
  font-size:.7rem;font-family:inherit;
  cursor:pointer;max-width:180px;
  transition:border-color .2s;
}
.control-group select:focus{outline:none;border-color:var(--accent)}

.status{font-size:.6rem;color:var(--text-muted);white-space:nowrap}
.midi-status.no-device{color:#ff3b30}

.size-group{
  display:flex;flex-direction:column;align-items:center;gap:.15rem;
}
.size-row{
  display:flex;align-items:center;gap:.3rem;
}
.size-row label{
  font-size:.6rem;color:var(--text-muted);font-weight:600;letter-spacing:.03em;white-space:nowrap;
}
.size-row input[type=range]{
  width:60px;height:3px;
  -webkit-appearance:none;appearance:none;
  background:var(--border);border-radius:2px;outline:none;
  cursor:pointer;
}
.size-row input[type=range]::-webkit-slider-thumb{
  -webkit-appearance:none;appearance:none;
  width:12px;height:12px;border-radius:50%;
  background:var(--accent);border:none;cursor:pointer;
}
.size-row input[type=range]::-moz-range-thumb{
  width:12px;height:12px;border-radius:50%;
  background:var(--accent);border:none;cursor:pointer;
}
.size-input{
  width:2.2rem;text-align:center;
  padding:.15rem .1rem;
  border:1px solid var(--border);border-radius:6px;
  background:var(--card);color:var(--text);
  font-size:.65rem;font-family:inherit;
  outline:none;
}
.size-input:focus{border-color:var(--accent)}
.size-reset{
  appearance:none;border:none;cursor:pointer;
  background:none;color:var(--text-muted);
  font-size:.85rem;line-height:1;padding:0;
  transition:color .2s;
}
.size-reset:hover{color:var(--accent)}

.keyboard-stage{
  flex:1;
  display:flex;align-items:center;justify-content:center;
  min-height:0;
}

.keyboard{
  display:inline-flex;flex-direction:column;
  gap:calc(min(1vw,1.2vh) * var(--key-scale));
}

.keyboard-row{
  display:flex;justify-content:center;
  gap:calc(min(1vw,1.2vh) * var(--key-scale));
}

.key{
  width:calc(min(5.5vw,11vh) * var(--key-scale));
  height:calc(min(5.5vw,11vh) * var(--key-scale));
  display:flex;align-items:center;justify-content:center;
  border-radius:50%;
  background:var(--card);
  border:2px solid var(--border);
  font-size:calc(min(1.3vw,2.3vh) * var(--key-scale));
  font-weight:700;color:var(--text-muted);
  user-select:none;cursor:pointer;
  touch-action:manipulation;
  transition:background .12s ease,box-shadow .12s ease,border-color .12s ease,color .12s ease,transform .08s ease;
}

.key.black{
  background:#2c2c2e;border-color:#444;color:#aaa;
}

.key.active{
  transform:scale(.92);
  box-shadow:0 2px 8px rgba(0,0,0,.15);
  filter:brightness(.85);
}

.key.black.active{
  box-shadow:0 2px 8px rgba(0,0,0,.3);
  filter:brightness(.7);
}

.footer{
  position:absolute;bottom:0;left:0;right:0;
  text-align:center;padding:.45rem;
  font-size:.7rem;color:#888;
}
.footer a{
  color:inherit;text-decoration:none;font-weight:500;
}
.footer a:hover{color:var(--accent)}