:root {
  --bg: #07090f;
  --ink: #f2f5ff;
  --accent: #4cff9e;
  --accent2: #ff5d7a;
}
* { box-sizing: border-box; margin: 0; padding: 0; }
html, body { height: 100%; }
body {
  background: radial-gradient(circle at 50% 30%, #131826, #07090f 70%);
  color: var(--ink);
  font-family: ui-monospace, "SF Mono", "Cascadia Code", Consolas, monospace;
  display: grid;
  place-items: center;
  min-height: 100vh;
  overflow: hidden;
}
.frame {
  position: relative;
  width: min(94vw, 900px);
  aspect-ratio: 3 / 2;
  border-radius: 14px;
  overflow: hidden;
  box-shadow: 0 30px 80px rgba(0,0,0,.6), 0 0 0 1px rgba(120,140,200,.15);
}
canvas {
  width: 100%;
  height: 100%;
  display: block;
  background: #090c14;
  touch-action: none;
}
.overlay {
  position: absolute;
  inset: 0;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 18px;
  background: rgba(7, 9, 15, 0.78);
  backdrop-filter: blur(6px);
  text-align: center;
  padding: 24px;
}
.overlay.hidden { display: none; }
h1 {
  font-size: clamp(38px, 8vw, 68px);
  letter-spacing: 8px;
  font-weight: 800;
  background: linear-gradient(90deg, var(--accent), #6ad7ff);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}
.sub { color: #97a0c0; letter-spacing: 2px; }
.diffs { display: flex; gap: 10px; }
.diffs button {
  background: transparent;
  border: 1px solid rgba(140,160,220,.3);
  color: #c7cdec;
  padding: 9px 16px;
  border-radius: 999px;
  cursor: pointer;
  font-family: inherit;
  font-size: 13px;
  letter-spacing: 1px;
  transition: .15s;
}
.diffs button.sel { border-color: var(--accent); color: var(--accent); box-shadow: 0 0 16px rgba(76,255,158,.25); }
.play {
  margin-top: 4px;
  background: var(--accent);
  color: #04210f;
  border: none;
  padding: 13px 42px;
  border-radius: 999px;
  font-family: inherit;
  font-weight: 700;
  font-size: 16px;
  letter-spacing: 2px;
  cursor: pointer;
  transition: transform .12s, box-shadow .12s;
}
.play:hover { transform: translateY(-2px); box-shadow: 0 10px 30px rgba(76,255,158,.35); }
.controls { color: #6f7798; font-size: 12px; margin-top: 10px; letter-spacing: 1px; }
.controls b { color: #c7cdec; }