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);
}

.field {
  width: min(220px, 70vw);
}

.field__label {
  display: block;
  margin-bottom: 6px;
  font-weight: 600;
  font-size: clamp(11px, 3vw, 12px);
  line-height: 1.3;
  font-family: inherit;
  color: rgba(255, 247, 230, 0.7);
}

.field__input {
  box-sizing: border-box;
  width: 100%;
  border: 2px solid rgba(255, 247, 230, 0.3);
  border-radius: 12px;
  padding: 12px 14px;
  font-weight: 500;
  font-size: clamp(13px, 3.6vw, 15px);
  line-height: 1.3;
  font-family: inherit;
  color: #fff7e6;
  background: transparent;
  outline: 2px solid transparent;
  outline-offset: 0;
  transition: outline-color 220ms ease-out, outline-offset 220ms ease-out;
}

.field__input:focus-visible {
  outline-color: #2f6df6;
  outline-offset: 4px;
}

.field__input.is-demo {
  animation: ring 2s ease-out infinite;
}

@keyframes ring {
  0%, 10% {
    outline-offset: 0;
    outline-color: rgba(47, 109, 246, 0.9);
  }
  45%, 65% {
    outline-offset: 4px;
    outline-color: rgba(47, 109, 246, 0.2);
  }
  100% {
    outline-offset: 0;
    outline-color: rgba(47, 109, 246, 0.9);
  }
}
@media (prefers-reduced-motion: reduce) {
  .field__input {
    transition: none;
  }
  .field__input.is-demo {
    animation: none;
    outline-color: rgba(47, 109, 246, 0.9);
  }
}