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

html, body {
  width: 100%;
  height: 100%;
  overflow: hidden;
  background: #070d18;
  -webkit-tap-highlight-color: transparent;
  -webkit-user-select: none;
  user-select: none;
  overscroll-behavior: none;
}

body {
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: "Trebuchet MS", "Segoe UI", system-ui, sans-serif;
  background:
    radial-gradient(ellipse 90% 60% at 50% 8%, #1b2c4a 0%, rgba(27, 44, 74, 0) 62%),
    radial-gradient(ellipse 120% 70% at 50% 105%, #17222f 0%, rgba(23, 34, 47, 0) 60%),
    #070d18;
}

#stage {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
  width: 100%;
  height: 100%;
}

canvas {
  display: block;
  touch-action: none;
  border-radius: 6px;
  box-shadow:
    0 0 0 1px rgba(120, 190, 220, 0.14),
    0 24px 70px rgba(0, 0, 0, 0.66),
    0 0 90px rgba(70, 150, 190, 0.10);
  cursor: crosshair;
}

@media (max-width: 700px) {
  canvas { border-radius: 0; box-shadow: none; }
}