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 {
  position: relative;
  overflow: hidden;
}

.stage::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image: linear-gradient(120deg, #17141a, #2f6df6, #fff7e6, #17141a);
  background-size: 220% 220%;
  animation: flow 2s ease-out infinite;
}

.hint {
  position: relative;
  margin: 0;
  padding: 10px 20px;
  border-radius: 999px;
  background: rgba(23, 20, 26, 0.35);
  color: #ffffff;
  font: 700 clamp(14px, 4vw, 18px)/1.3 -apple-system, "Segoe UI", "Noto Sans KR", sans-serif;
}

@keyframes flow {
  0% {
    background-position: 0% 50%;
  }
  50% {
    background-position: 100% 50%;
  }
  100% {
    background-position: 0% 50%;
  }
}
@media (prefers-reduced-motion: reduce) {
  .stage::before {
    animation: none;
    background-position: 0% 50%;
  }
}