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

.stage {
  box-sizing: border-box;
  min-height: 100vh;
  display: grid;
  place-items: center;
  margin: 0;
  background: #17141a;
  font-family: -apple-system, "Segoe UI", "Noto Sans KR", sans-serif;
  padding: clamp(8px, 4vw, 24px);
}

.stage {
  padding: clamp(6px, 2.4vw, 16px);
}

.frame {
  position: relative;
  width: min(200px, 64vw);
  aspect-ratio: 4/3;
  border-radius: 4px;
  background: linear-gradient(135deg, rgba(255, 247, 230, 0.16), rgba(255, 247, 230, 0.04));
  display: grid;
  place-items: center;
  outline: none;
}

.frame__bracket {
  position: absolute;
  width: 22px;
  height: 22px;
  border: 3px solid #fff7e6;
  transition: transform 300ms cubic-bezier(0.2, 1.4, 0.4, 1);
}

.frame__bracket--tl {
  top: -3px;
  left: -3px;
  border-right: 0;
  border-bottom: 0;
}

.frame__bracket--tr {
  top: -3px;
  right: -3px;
  border-left: 0;
  border-bottom: 0;
}

.frame__bracket--bl {
  bottom: -3px;
  left: -3px;
  border-right: 0;
  border-top: 0;
}

.frame__bracket--br {
  bottom: -3px;
  right: -3px;
  border-left: 0;
  border-top: 0;
}

.frame:hover .frame__bracket--tl, .frame:focus-visible .frame__bracket--tl {
  transform: translate(-6px, -6px);
}

.frame:hover .frame__bracket--tr, .frame:focus-visible .frame__bracket--tr {
  transform: translate(6px, -6px);
}

.frame:hover .frame__bracket--bl, .frame:focus-visible .frame__bracket--bl {
  transform: translate(-6px, 6px);
}

.frame:hover .frame__bracket--br, .frame:focus-visible .frame__bracket--br {
  transform: translate(6px, 6px);
}

.frame.is-demo .frame__bracket--tl {
  animation: open-tl 2s cubic-bezier(0.2, 1.4, 0.4, 1) infinite;
}

.frame.is-demo .frame__bracket--tr {
  animation: open-tr 2s cubic-bezier(0.2, 1.4, 0.4, 1) infinite;
}

.frame.is-demo .frame__bracket--bl {
  animation: open-bl 2s cubic-bezier(0.2, 1.4, 0.4, 1) infinite;
}

.frame.is-demo .frame__bracket--br {
  animation: open-br 2s cubic-bezier(0.2, 1.4, 0.4, 1) infinite;
}

@keyframes open-tl {
  0%, 15% {
    transform: translate(0, 0);
  }
  50%, 70% {
    transform: translate(-6px, -6px);
  }
  100% {
    transform: translate(0, 0);
  }
}
@keyframes open-tr {
  0%, 15% {
    transform: translate(0, 0);
  }
  50%, 70% {
    transform: translate(6px, -6px);
  }
  100% {
    transform: translate(0, 0);
  }
}
@keyframes open-bl {
  0%, 15% {
    transform: translate(0, 0);
  }
  50%, 70% {
    transform: translate(-6px, 6px);
  }
  100% {
    transform: translate(0, 0);
  }
}
@keyframes open-br {
  0%, 15% {
    transform: translate(0, 0);
  }
  50%, 70% {
    transform: translate(6px, 6px);
  }
  100% {
    transform: translate(0, 0);
  }
}
.frame__label {
  font-weight: 600;
  font-size: clamp(11px, 3vw, 12px);
  line-height: 1;
  font-family: inherit;
  color: rgba(255, 247, 230, 0.8);
}

@media (prefers-reduced-motion: reduce) {
  .frame.is-demo .frame__bracket {
    animation: none;
  }
}