/* ==================================================
   ベース設定・共通
================================================== */
body {
  margin: 0;
  font-family: "Inter", sans-serif;
  transition: background-color 0.4s, color 0.4s, background-image 0.6s;
  background-attachment: fixed;
  background-position: center;
  background-size: cover;
  background-repeat: no-repeat;
}

body::before {
  content: "";
  position: fixed;
  inset: 0;
  background: rgba(255, 255, 255, 0.5);
  backdrop-filter: blur(6px);
  z-index: -1;
  transition: background 0.4s;
}

.dark-mode::before {
  background: rgba(5, 5, 15, 0.65);
}

.light-mode {
  color: #1a1a1a;
  background-image: url("/img/bg_light.png");
}

.dark-mode {
  color: #f5f6fa;
  background-image: url("/img/bg_dark.png");
}