html, body {
  margin: 0;
  overflow: hidden;
}

.stage {
  box-sizing: border-box;
  min-height: 100vh;
  display: grid;
  place-items: center;
  margin: 0;
  background: #ffd23f;
  font-family: -apple-system, "Segoe UI", "Noto Sans KR", sans-serif;
  padding: clamp(8px, 4vw, 24px);
}

.wrap {
  display: grid;
  place-items: center;
}

.cardZone {
  position: relative;
  width: 170px;
  height: 170px;
}

.backing {
  position: absolute;
  inset: 0;
  border-radius: 16px;
  background: #fff7e6;
}

.card {
  position: absolute;
  inset: 0;
  border: 0;
  padding: 0;
  appearance: none;
  cursor: pointer;
  background: #2f6df6;
  --peel-size: 0px;
  clip-path: polygon(0 0, calc(100% - var(--peel-size)) 0, 100% var(--peel-size), 100% 100%, 0 100%);
}
.card:focus-visible {
  outline: 2px solid #5b8cf8;
  outline-offset: 4px;
}

.cardMark {
  position: absolute;
  inset: 0;
  margin: auto;
  width: 56px;
  height: 56px;
  border-radius: 50%;
  border: 8px solid rgba(255, 247, 230, 0.8);
}

.peelShade {
  position: absolute;
  top: 0;
  right: 0;
  width: var(--peel-size, 0px);
  height: var(--peel-size, 0px);
  --peel-deg: 45deg;
  clip-path: polygon(100% 0, 100% 100%, 0 0);
  background: linear-gradient(var(--peel-deg), rgba(255, 247, 230, 0.95), rgba(255, 247, 230, 0) 72%);
  pointer-events: none;
}

@media (max-width: 340px) {
  .cardZone {
    width: 130px;
    height: 130px;
  }
  .cardMark {
    width: 42px;
    height: 42px;
    border-width: 6px;
  }
}
@media (prefers-reduced-motion: reduce) {
  .card {
    transition: none;
  }
}