/* ============================================================
   build1485 — 残響の塔15F BOSS：暗転
   暗転中は「敵弾（Canvas z17）」と「自キャラ」だけを見せる。
   ボス本体・背景・自機弾は暗幕（z16）の下に沈む。HP表示とフッターは残す。
   ============================================================ */
#shooting-tower15-blackout{
  position:absolute;
  inset:0;
  z-index:16;
  pointer-events:none;
  opacity:0;
  visibility:hidden;
  transition:opacity .45s ease, visibility 0s linear .45s;
  background:
    radial-gradient(ellipse 90% 60% at 50% 115%, rgba(60,8,24,.55), rgba(0,0,0,0) 70%),
    rgba(4,3,8,.965);
}
#shooting-tower15-blackout span{
  position:absolute;
  left:50%;
  top:36%;
  transform:translate(-50%,-50%);
  color:rgba(214,52,86,.9);
  font:700 26px/1 "Noto Serif JP",serif;
  letter-spacing:.6em;
  text-indent:.6em;
  text-shadow:0 0 12px rgba(214,40,80,.65);
  opacity:0;
}
#shooting-event-root.tower15-blackout #shooting-tower15-blackout{
  opacity:1;
  visibility:visible;
  transition:opacity .45s ease, visibility 0s;
}
#shooting-event-root.tower15-blackout #shooting-tower15-blackout span{
  animation:tower15BlackoutLabel 1.4s ease-out forwards;
}
@keyframes tower15BlackoutLabel{
  0%{opacity:0;letter-spacing:.9em}
  25%{opacity:1}
  100%{opacity:0;letter-spacing:.6em}
}
/* 自キャラは暗幕の上へ。ボスは暗幕の下へ。 */
#shooting-event-root.tower15-blackout #shooting-player{z-index:19 !important;}
#shooting-event-root.tower15-blackout .shooting-boss{z-index:9 !important;}
@media (prefers-reduced-motion:reduce){
  #shooting-event-root.tower15-blackout #shooting-tower15-blackout span{animation:none;opacity:.8;}
}