#loading-screen {
  position: fixed;
  top: 0; left: 0;
  width: 100%;
  height: 100%;
  z-index: 1000;
  display: flex;
  justify-content: center;
  align-items: center;
  flex-direction: column;
  background: #111111;
  transition: opacity 1s ease, visibility 1s ease;
}

#loading-screen.hidden {
  opacity: 0;
  visibility: hidden;
  pointer-events: none;
}

.logo-container {
  position: relative;
  width: 200px;
  height: 200px;
  margin-bottom: 30px;
}

.logo {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  font-size: 2.5em;
  font-weight: bold;
  color: #00bfff;
  opacity: 0;
  animation: fadeIn 1.5s ease forwards;
  animation-delay: 1.2s;
  z-index: 2;
}

.particle {
  position: absolute;
  width: 10px;
  height: 10px;
  background: #ffffff;
  border-radius: 50%;
  box-shadow: 0 0 8px #fadb86;
  z-index: 1;
}

.loading_concept {
  font-family: "Zen Kaku Gothic New";
  letter-spacing: 0.1em;
  font-size: 1.2em;
  color: #ffffff;
  max-width: 80%;
  text-align: center;
  opacity: 0;
  animation: fadeIn 2s ease forwards;
  animation-delay: 2.5s;
}

@keyframes fadeIn {
  to {
    opacity: 1;
  }
}

.contents-wrapper {
  opacity: 0;
  transition: opacity 1s ease;
}

.contents-wrapper.visible {
  opacity: 1;
}