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);
}

.uiclay {
  display: flex;
  flex-direction: column;
  gap: 16px;
  width: clamp(220px, 70vw, 300px);
}

.uiclay__btn {
  border: 0;
  border-radius: 12px;
  background: #0a4fe8;
  color: #fff7e6;
  padding: 12px 20px;
  font-weight: 700;
  font-size: clamp(12px, 2.8vw, 14px);
  line-height: 1;
  box-shadow: 6px 6px 12px rgba(23, 20, 26, 0.3), -4px -4px 10px rgba(255, 255, 255, 0.35);
  animation: btnPress 2s cubic-bezier(0.2, 1.4, 0.4, 1) infinite;
}

.uiclay__field {
  position: relative;
  display: block;
  border-radius: 12px;
  background: rgba(255, 255, 255, 0.06);
  padding: 4px;
  box-shadow: inset 3px 3px 6px rgba(23, 20, 26, 0.25), inset -3px -3px 6px rgba(255, 255, 255, 0.25);
  animation: focusGlow 2s cubic-bezier(0.2, 1.4, 0.4, 1) infinite;
}

.uiclay__input {
  width: 100%;
  box-sizing: border-box;
  border: 0;
  background: transparent;
  border-radius: 12px;
  padding: 12px 16px;
  color: #fff7e6;
  font-weight: 500;
  font-size: clamp(12px, 2.8vw, 14px);
  line-height: 1;
  outline: none;
}

.uiclay__input::placeholder {
  color: rgba(255, 247, 230, 0.5);
}

@keyframes btnPress {
  0%, 55%, 100% {
    box-shadow: 6px 6px 12px rgba(23, 20, 26, 0.3), -4px -4px 10px rgba(255, 255, 255, 0.35);
    transform: scale(1);
  }
  75% {
    box-shadow: inset 4px 4px 8px rgba(23, 20, 26, 0.35), inset -4px -4px 8px rgba(255, 255, 255, 0.3);
    transform: scale(0.97);
  }
}
@keyframes focusGlow {
  0%, 55%, 100% {
    box-shadow: inset 3px 3px 6px rgba(23, 20, 26, 0.25), inset -3px -3px 6px rgba(255, 255, 255, 0.25);
  }
  75% {
    box-shadow: inset 2px 2px 4px rgba(23, 20, 26, 0.15), inset -2px -2px 4px rgba(255, 255, 255, 0.15), 0 0 0 3px rgba(47, 109, 246, 0.45);
  }
}
@media (prefers-reduced-motion: reduce) {
  .uiclay__btn, .uiclay__field {
    animation: none !important;
    transform: none;
  }
}