:root{
  --bg:#0f1720;
  --fg:#e6eef8;
  --muted:#9aa7b8;
  --accent:#2b9fd6;
}

html,body{
  height:100%;
  margin:0;
  background:var(--bg);
  color:var(--fg);
  font-family:Inter, system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial;
  -webkit-font-smoothing:antialiased;
  -moz-osx-font-smoothing:grayscale;
}

#app{
  height:100vh;
  width:100vw;
  position:relative;
  display:flex;
  align-items:stretch;
  justify-content:stretch;
}

iframe#preview{
  flex:1;
  border:0;
  width:100%;
  height:100%;
  display:block;
  background:#ffffff;
}

/* Controls overlay (mobile-friendly) */
.controls{
  position:absolute;
  right:12px;
  top:12px;
  display:flex;
  gap:8px;
  z-index:40;
}

.controls button{
  background:rgba(255,255,255,0.06);
  color:var(--fg);
  border:1px solid rgba(255,255,255,0.06);
  padding:10px 12px;
  border-radius:10px;
  min-width:44px;
  min-height:44px;
  font-size:13px;
  line-height:1;
  cursor:pointer;
  backdrop-filter: blur(6px);
}

.controls button:active{ transform: translateY(1px); }

@media (max-width:520px){
  .controls{
    right:8px;
    top:8px;
    gap:6px;
  }
  .controls button{
    padding:8px 10px;
    border-radius:8px;
    font-size:12px;
    min-width:40px;
    min-height:40px;
  }
}