/* ---- TOPSIDE base styles ---- */
* { margin: 0; padding: 0; box-sizing: border-box; }
html, body {
  width: 100%; height: 100%;
  overflow: hidden;
  background: #0b0620;
  font-family: 'Avenir Next', 'Segoe UI', system-ui, -apple-system, sans-serif;
  -webkit-user-select: none; user-select: none;
  -webkit-tap-highlight-color: transparent;
  touch-action: none;
  overscroll-behavior: none;
}
#game {
  position: fixed; inset: 0;
  display: block;
  width: 100%; height: 100%;
}
/* scanline + vignette overlays (pure CSS, cheap) */
#scan {
  position: fixed; inset: 0; pointer-events: none; z-index: 5;
  background: repeating-linear-gradient(
    to bottom,
    rgba(255,255,255,0.025) 0px,
    rgba(255,255,255,0.025) 1px,
    rgba(0,0,0,0.06) 2px,
    rgba(0,0,0,0.06) 3px
  );
  opacity: .55;
  mix-blend-mode: overlay;
}
#vignette {
  position: fixed; inset: 0; pointer-events: none; z-index: 4;
  background: radial-gradient(ellipse at center, transparent 58%, rgba(4,0,18,0.55) 100%);
}
/* HUD buttons */
#hud {
  position: fixed; top: max(10px, env(safe-area-inset-top)); right: max(10px, env(safe-area-inset-right));
  z-index: 10; display: flex; gap: 8px;
}
.hudbtn {
  width: 42px; height: 42px;
  border-radius: 12px;
  border: 1px solid rgba(255,255,255,0.22);
  background: rgba(20,10,50,0.55);
  color: #fff;
  font-size: 20px;
  line-height: 1;
  cursor: pointer;
  backdrop-filter: blur(4px);
  -webkit-backdrop-filter: blur(4px);
  box-shadow: 0 2px 12px rgba(0,0,0,0.4);
  transition: transform .12s ease, background .12s ease;
}
.hudbtn:active { transform: scale(0.9); background: rgba(60,30,120,0.7); }
/* FIRE (power) button */
.fab {
  position: fixed;
  right: max(22px, env(safe-area-inset-right));
  bottom: max(26px, env(safe-area-inset-bottom));
  z-index: 10;
  width: 76px; height: 76px;
  border-radius: 50%;
  border: 2px solid rgba(255,255,255,0.5);
  background: radial-gradient(circle at 35% 30%, rgba(255,120,160,0.95), rgba(180,30,90,0.85));
  color: #fff; font-size: 34px;
  cursor: pointer;
  display: none;
  align-items: center; justify-content: center;
  box-shadow: 0 0 26px rgba(255,80,140,0.8), 0 4px 18px rgba(0,0,0,0.5);
  animation: fabpulse 1.4s ease-in-out infinite;
  touch-action: none;
}
.fab.on { display: flex; }
@keyframes fabpulse {
  0%,100% { transform: scale(1); }
  50% { transform: scale(1.08); }
}