#btcLoader {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: #f5f5f5; /* neutral grayish */
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  z-index: 9999;
  opacity: 1;
  transition: opacity 0.6s ease; /* fade out */
}

#btcLoader.fade-out {
  opacity: 0;
  pointer-events: none; /* prevent blocking clicks after fade */
}

.btc-logo-wrapper {
  width: 150px;
  height: 150px;
}

.btc-logo {
  width: 100%;
  height: 100%;
}

.btc-text {
  margin-top: 1rem;
  font-family: "Georgia", serif;
  font-size: 1.1rem;
  color: #555;
}

.btc-fill {
  animation: btcFillUp 2s infinite linear;
}

@keyframes btcFillUp {
  0% {
    transform: translateY(100%);
  }
  50% {
    transform: translateY(50%);
  }
  100% {
    transform: translateY(100%);
  }
}