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

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

.mk-frame {
  position: relative;
  width: min(260px, 78vw);
  aspect-ratio: 8/5;
  border-radius: 16px;
  overflow: hidden;
  box-shadow: 0 14px 24px rgba(23, 20, 26, 0.32);
}

.mk-photo {
  position: absolute;
  inset: 0;
  background: radial-gradient(110px circle at 34% 32%, rgba(255, 255, 255, 0.55), transparent 60%), linear-gradient(150deg, #2f6df6, #17141a);
  mask-image: linear-gradient(100deg, transparent 0 38%, #000 58% 100%);
  -webkit-mask-image: linear-gradient(100deg, transparent 0 38%, #000 58% 100%);
  mask-size: 260% 100%;
  -webkit-mask-size: 260% 100%;
  mask-position: 0 0;
  -webkit-mask-position: 0 0;
}

.mk-photo {
  transition: mask-position 700ms ease-out, -webkit-mask-position 700ms ease-out;
}

.mk-frame.in .mk-photo {
  mask-position: 100% 0;
  -webkit-mask-position: 100% 0;
}

@keyframes mk-sweep {
  0%, 8% {
    mask-position: 0 0;
    -webkit-mask-position: 0 0;
  }
  45%, 60% {
    mask-position: 100% 0;
    -webkit-mask-position: 100% 0;
  }
  95%, 100% {
    mask-position: 0 0;
    -webkit-mask-position: 0 0;
  }
}
.mk-frame.is-demo .mk-photo {
  animation: mk-sweep 2s ease-out infinite;
}

@media (prefers-reduced-motion: reduce) {
  .mk-frame.in .mk-photo,
  .mk-frame.is-demo .mk-photo {
    animation: none !important;
    transition: none !important;
    mask-position: 100% 0 !important;
    -webkit-mask-position: 100% 0 !important;
  }
}