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);
}

.cg {
  width: 100%;
  max-width: 300px;
}

.cg__field {
  position: relative;
  border-radius: 12px;
}

.cg__glow {
  position: absolute;
  inset: -3px;
  border-radius: 12px;
  border: 2px solid #3ddc97;
  opacity: 0;
  transform: scale(1);
  pointer-events: none;
}

.cg__glow--on {
  animation: cgGlow 2s ease-out;
}

@keyframes cgGlow {
  0% {
    opacity: 0;
    transform: scale(1);
  }
  15% {
    opacity: 0.9;
    transform: scale(1.06);
  }
  30% {
    opacity: 0.1;
    transform: scale(1.01);
  }
  45% {
    opacity: 0.3;
    transform: scale(1.035);
  }
  60% {
    opacity: 0.05;
    transform: scale(1.005);
  }
  75% {
    opacity: 0.1;
    transform: scale(1.015);
  }
  100% {
    opacity: 0;
    transform: scale(1);
  }
}
.cg__input {
  width: 100%;
  box-sizing: border-box;
  padding: 12px 40px 12px 16px;
  border-radius: 12px;
  border: 0;
  background: #17141a;
  color: #fff7e6;
  font-family: "SFMono-Regular", Consolas, monospace;
  font-weight: 600;
  font-size: 16px;
  letter-spacing: 0.05em;
  position: relative;
}
.cg__input:focus {
  outline: 2px solid #17141a;
  outline-offset: 2px;
}
.cg__input[readonly] {
  color: #3ddc97;
}

.cg__icon {
  position: absolute;
  right: 16px;
  top: 50%;
  transform: translateY(-50%);
  color: rgba(255, 247, 230, 0.55);
  display: grid;
  place-items: center;
}
.cg__icon svg {
  grid-area: 1/1;
  transition: opacity 220ms ease-out, transform 220ms cubic-bezier(0.2, 0.8, 0.2, 1);
}
.cg__icon .cg__closed {
  opacity: 0;
  transform: scale(0.5);
}

.cg__field--locked .cg__icon {
  color: #3ddc97;
}
.cg__field--locked .cg__icon .cg__open {
  opacity: 0;
  transform: scale(0.5);
}
.cg__field--locked .cg__icon .cg__closed {
  opacity: 1;
  transform: scale(1);
}

@media (max-width: 340px) {
  .cg__input {
    padding: 8px 32px 8px 12px;
    font-size: 14px;
  }
}
@media (prefers-reduced-motion: reduce) {
  .cg__glow--on {
    animation: none;
  }
  .cg__icon svg {
    transition: none;
  }
}