#loading-overlay {
  position: fixed;
  inset: 0;
  background: radial-gradient(circle at center, #0a0a0a 0%, #000 100%);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 9999;
  overflow: hidden;
  transition: opacity 1.2s ease-in-out;
}

/* ロゴ */
#fog-container {
  position: relative;
  width: 260px;
  height: 260px;
  display: inline-block;
}

#main-logo {
  width: 100%;
  opacity: 0;
  filter: blur(10px);
  transition: opacity 1s ease-out, filter 1.5s ease-out;
  position: relative;
  z-index: 1;
}

/* 霧のレイヤー */
#fog-layer {
  position: absolute;
  inset: 0;
  z-index: 2;
  pointer-events: none;
  mix-blend-mode: lighten;
  filter: blur(12px);
}

/* ロゴが見えてくるとき */
#main-logo.reveal {
  opacity: 1;
  filter: blur(0);
}

/* ローディング終了時のフェードアウト */
#loading-overlay.fade-out {
  opacity: 0;
  pointer-events: none;
}