/* 裏サイバー背景テーマ（画像なし・CSSのみで軽量） */
body {
  background-color: #04060e !important;
  background-image:
    radial-gradient(1000px 520px at 15% -10%, rgba(59, 130, 246, 0.18), transparent 60%),
    radial-gradient(820px 420px at 88% 8%, rgba(34, 211, 238, 0.12), transparent 60%),
    radial-gradient(900px 600px at 50% 112%, rgba(99, 102, 241, 0.14), transparent 60%);
  background-attachment: fixed;
}

/* ネオングリッド */
body::before {
  content: "";
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: 0;
  background-image:
    linear-gradient(rgba(56, 189, 248, 0.055) 1px, transparent 1px),
    linear-gradient(90deg, rgba(56, 189, 248, 0.055) 1px, transparent 1px);
  background-size: 44px 44px;
}

/* 上部の走査線風アクセント */
body::after {
  content: "";
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: 2px;
  z-index: 60;
  pointer-events: none;
  background: linear-gradient(90deg, transparent, rgba(56, 189, 248, 0.85), rgba(59, 130, 246, 0.85), transparent);
  box-shadow: 0 0 18px rgba(56, 189, 248, 0.55);
}

header, main, footer, aside { position: relative; z-index: 1; }