:root{
  --panel:#0b1020cc;
  --text:#e8f0ff;
  --shadow: 0 12px 40px rgba(0,0,0,.55);
  --r: 18px;
}

html, body { height:100%; margin:0; background:#000; }
.stage{
  position:fixed; inset:0;
  background:#000;
  touch-action:manipulation;
  user-select:none;
}
.face{ width:100vw; height:100vh; display:block; }

/* Touch overlay: 2 links only */
.overlay{
  position:fixed;
  left:max(12px, env(safe-area-inset-left));
  right:max(12px, env(safe-area-inset-right));
  bottom:max(12px, env(safe-area-inset-bottom));
  display:flex; gap:10px; align-items:center;

  background:var(--panel);
  border:1px solid rgba(255,255,255,.10);
  border-radius:var(--r);
  padding:10px 12px;
  box-shadow:var(--shadow);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);

  opacity:0;
  transform: translateY(10px);
  pointer-events:none;
  transition: opacity .18s ease, transform .18s ease;
}
.overlay.show{ opacity:1; transform:translateY(0); pointer-events:auto; }

a.btn{
  border:1px solid rgba(255,255,255,.14);
  background: rgba(255,255,255,.06);
  color: var(--text);
  border-radius:14px;
  padding:10px 12px;
  font-size:14px;
  text-decoration:none;
  line-height:1;
  display:inline-flex; align-items:center; gap:8px;
}
a.btn:active{ transform: translateY(1px); }