:root{
  --bg: #0b0b0f;
  --btn: #000;
  --btn-engrave: rgba(255,255,255,0.06);
  --btn-highlight: rgba(255,255,255,0.12);
  --btn-shadow: rgba(0,0,0,0.6);
  --size: min(22vmin, 200px);
  --radius: 18px;
  --gap: clamp(16px, 5vmin, 36px);
}

* { box-sizing: border-box; }
html, body { height: 100%; }
body {
  margin: 0;
  background: radial-gradient(1200px 800px at 50% 20%, #111 0%, #0a0a0e 60%, #050507 100%);
  color: #e7e7ea;
  display: grid;
  place-items: center;
  font-family: system-ui, -apple-system, Segoe UI, Roboto, Ubuntu, Cantarell, "Helvetica Neue", Arial, "Noto Sans", "Apple Color Emoji", "Segoe UI Emoji";
  overflow: hidden;
}

.wrap {
  display: grid;
  grid-auto-flow: column;
  gap: var(--gap);
  align-items: center;
  justify-content: center;
  padding: 24px;
  filter: drop-shadow(0 30px 60px rgba(0,0,0,.35));
}

.btn {
  width: var(--size);
  aspect-ratio: 1 / 1;
  border: none;
  border-radius: var(--radius);
  background: linear-gradient(145deg, #0d0d12, var(--btn));
  color: #b9b9c2;
  font-size: clamp(42px, 10vmin, 88px);
  font-weight: 800;
  letter-spacing: 2px;
  display: grid;
  place-items: center;
  padding: 0;
  cursor: pointer;
  position: relative;
  user-select: none;
  outline: none;
  transition: transform .06s ease, filter .2s ease;
  box-shadow:
    inset 0 2px 6px var(--btn-engrave),
    inset 0 -2px 10px rgba(0,0,0,.65),
    0 1px 0 #222,
    0 12px 28px var(--btn-shadow);
  text-shadow:
    0 -2px 0 rgba(0,0,0,0.85),
    0 1px 0 var(--btn-highlight);
}

.btn::before {
  content: "";
  position: absolute; inset: 0;
  border-radius: inherit;
  background:
    radial-gradient(120% 120% at 30% 25%, rgba(255,255,255,.06), transparent 50%),
    linear-gradient(180deg, rgba(255,255,255,.06), rgba(0,0,0,.25));
  mix-blend-mode: screen;
  pointer-events: none;
  border: 1px solid #1d1d24;
}

.btn:active {
  transform: translateY(2px) scale(0.992);
  box-shadow:
    inset 0 3px 14px rgba(0,0,0,.85),
    inset 0 -4px 8px rgba(255,255,255,.04),
    0 4px 14px rgba(0,0,0,.5);
  filter: brightness(0.95);
}

.btn span { transform: translateY(-2px); opacity: .9; }

/* Video layer */
.video-layer {
  position: fixed;
  inset: 0;
  display: none;
  background: #000;
  z-index: 10;
}
.video-layer.active { display: block; }
.video-layer iframe { width: 100%; height: 100%; border: 0; display: block; }

/* Reduce motion */
@media (prefers-reduced-motion: reduce) {
  .btn { transition: none; }
}