/* ===== 雪を表示するコンテナのスタイル ===== */
html, body {
  height: 100%;
  margin: 0;
}

body {
  position: relative;
  min-height: 100vh;
  width: 100%;
  overflow: hidden;
  background-color: #ffffff;
  background-image: url("../img/snow.webp");
  background-repeat: no-repeat;
  background-size: cover;
  background-position: center center;
  background-attachment: fixed;

  image-color-adjust: exact;
  -webkit-image-color-adjust: none;
  forced-color-adjust: none;
  color-scheme: light;
}

/* ===== 雪のスタイル ===== */
.snow {
  background-color: #fff !important;
  border-radius: 50%;
  position: absolute;
  animation: animate-snow 10s linear;

  filter: invert(0) hue-rotate(0) saturate(100%) !important;
  mix-blend-mode: normal !important;
  forced-color-adjust: none;
}

/* ===== 雪のアニメーション ===== */
@keyframes animate-snow {
  0% {
    opacity: 0;
    transform: translateY(-10vh);
  }
  10% {
    opacity: 1;
  }
  90% {
    opacity: 1;
  }
  100% {
    opacity: 0;
    transform: translateY(100vh);
  }
}