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

.stage {
  box-sizing: border-box;
  min-height: 100vh;
  display: grid;
  place-items: center;
  margin: 0;
  background: #ff4d1f;
  font-family: -apple-system, "Segoe UI", "Noto Sans KR", sans-serif;
  padding: clamp(8px, 4vw, 24px);
}

.field {
  width: min(230px, 82vw);
  cursor: pointer;
}
.field__frame {
  position: relative;
}
.field__input {
  box-sizing: border-box;
  width: 100%;
  border: 2.5px solid transparent;
  border-radius: 12px;
  padding: clamp(10px, 3.4vw, 14px) clamp(12px, 4vw, 16px);
  font-weight: 500;
  font-size: clamp(13px, 3.8vw, 15px);
  line-height: 1;
  font-family: inherit;
  color: #17141a;
  background: #fff7e6;
  pointer-events: none;
}
.field__ring {
  position: absolute;
  inset: 0;
  border: 2.5px solid #c2361a;
  border-radius: 12px;
  opacity: 0;
  pointer-events: none;
}
.field__msg {
  margin: 8px 0 0;
  color: #fff7e6;
  font-weight: 700;
  font-size: clamp(11px, 3.2vw, 13px);
  line-height: 1.3;
  font-family: inherit;
  opacity: 0;
  transform: translateY(-4px);
  transition: opacity 600ms cubic-bezier(0.36, 0.07, 0.19, 0.97), transform 600ms cubic-bezier(0.36, 0.07, 0.19, 0.97);
}
.field.is-error .field__frame {
  animation: shake 600ms cubic-bezier(0.36, 0.07, 0.19, 0.97) both;
}
.field.is-error .field__ring {
  opacity: 1;
}
.field.is-error .field__msg {
  opacity: 1;
  transform: translateY(0);
}
.field.is-demo .field__frame {
  animation: shake-loop 2s cubic-bezier(0.36, 0.07, 0.19, 0.97) infinite;
}
.field.is-demo .field__ring {
  animation: ring-loop 2s cubic-bezier(0.36, 0.07, 0.19, 0.97) infinite;
}
.field.is-demo .field__msg {
  animation: msg-loop 2s cubic-bezier(0.36, 0.07, 0.19, 0.97) infinite;
}

@keyframes shake {
  10%, 90% {
    transform: translateX(-3px);
  }
  20%, 80% {
    transform: translateX(6px);
  }
  30%, 70% {
    transform: translateX(-6px);
  }
  40%, 60% {
    transform: translateX(4.2px);
  }
  50% {
    transform: translateX(-4.2px);
  }
}
@keyframes shake-loop {
  0%, 55% {
    transform: translateX(0);
  }
  60%, 90% {
    transform: translateX(-3px);
  }
  65% {
    transform: translateX(6px);
  }
  70% {
    transform: translateX(-6px);
  }
  75% {
    transform: translateX(4.2px);
  }
  80% {
    transform: translateX(-4.2px);
  }
  90%, 100% {
    transform: translateX(0);
  }
}
@keyframes ring-loop {
  0%, 55% {
    opacity: 0;
  }
  60%, 90% {
    opacity: 1;
  }
  100% {
    opacity: 0;
  }
}
@keyframes msg-loop {
  0%, 55% {
    opacity: 0;
    transform: translateY(-4px);
  }
  65%, 92% {
    opacity: 1;
    transform: translateY(0);
  }
  100% {
    opacity: 0;
    transform: translateY(-4px);
  }
}
@media (prefers-reduced-motion: reduce) {
  .field__ring, .field__msg {
    transition: none;
  }
  .field.is-error .field__frame,
  .field.is-demo .field__frame {
    animation: none !important;
  }
  .field.is-demo .field__ring,
  .field.is-demo .field__msg {
    animation: none !important;
  }
  .field.is-error .field__ring {
    opacity: 1;
  }
  .field.is-error .field__msg {
    opacity: 1;
    transform: none;
  }
}