/* =========================================================
   PRIME GEAR - Transition Visual v0.9
   - 本体シルエットは固定
   - 通常 / ウインク / 球バウンド / ぼーっと / ハート目の5表情
   - 表情はJSで重み付きランダム抽選
   - ハート目はPRIME GEARレッド #B00000
   - 背景色・不透明度・演出色・幕速度はプラグイン設定から変更可能
   - 終了時は幕が上がるように上方向へ退場
   - 幕の下に薄いbackdropを残して白フラッシュを抑制
========================================================= */

:root {
  --pg-transition-bg: rgba(12, 13, 15, 0.94);
  --pg-transition-bg-solid: #0c0d0f;
  --pg-transition-underlay: rgba(12, 13, 15, .17);
  --pg-transition-fg: #f7f7f5;
  --pg-primegear-transition-red: #B00000;
  --pg-transition-curtain-duration: 480ms;
  --pg-transition-backdrop-duration: 374ms;
  --pg-transition-backdrop-delay: 58ms;
  --pg-transition-curtain-ease: cubic-bezier(.76, 0, .18, 1);
}

/* =========================================================
   全画面レイヤー
========================================================= */
.pg-transition {
  color: var(--pg-transition-fg);
}

.pg-transition__curtain {
  background: var(--pg-transition-bg);
  transform: translate3d(0, 0, 0);
  will-change: transform;
}

/*
 * 幕の下に残るごく薄い暗幕。
 * 幕が上がった瞬間に下の白背景が強く露出するのを防ぎ、
 * 幕上げに合わせて自然に消える。
 */
.pg-transition__backdrop {
  background: var(--pg-transition-underlay);
}

.pg-transition.is-hidden .pg-transition__curtain {
  opacity: 0;
  transform: translate3d(0, -102%, 0);
  transition: none;
}

.pg-transition.is-hidden .pg-transition__backdrop {
  opacity: 0;
  transition: none;
}

.pg-transition.is-initial .pg-transition__curtain,
.pg-transition.is-exiting .pg-transition__curtain,
.pg-transition.is-resuming .pg-transition__curtain {
  opacity: 1;
  transform: translate3d(0, 0, 0);
  transition: none;
}

.pg-transition.is-initial .pg-transition__backdrop,
.pg-transition.is-exiting .pg-transition__backdrop,
.pg-transition.is-resuming .pg-transition__backdrop {
  opacity: 1;
  transition: none;
}

/* 幕だけを上へ。レイヤー本体は固定して白フラッシュを防ぐ */
.pg-transition.is-leaving .pg-transition__curtain {
  opacity: 1;
  transform: translate3d(0, -102%, 0);
  transition: transform var(--pg-transition-curtain-duration) var(--pg-transition-curtain-ease);
}

/*
 * 薄いbackdropは幕より少し遅れて消える。
 * 新ページが露出するときの「白への急変」を和らげる。
 */
.pg-transition.is-leaving .pg-transition__backdrop {
  opacity: 0;
  transition: opacity var(--pg-transition-backdrop-duration) ease var(--pg-transition-backdrop-delay);
}

/* 幕の下端にほんの少し影を付けて「幕が上がる」感を維持 */
.pg-transition__curtain::after {
  content: '';
  position: absolute;
  left: 0;
  right: 0;
  bottom: -1px;
  height: 18px;
  pointer-events: none;
  opacity: 0;
  background: linear-gradient(to bottom, rgba(0, 0, 0, .16), rgba(0, 0, 0, 0));
  transition: opacity 120ms ease;
}

.pg-transition.is-leaving .pg-transition__curtain::after {
  opacity: 1;
}

/* =========================================================
   PRIME GEAR アイコン
========================================================= */
.pg-transition__visual {
  width: min(var(--pg-transition-visual-size, 104px), 28vw);
  aspect-ratio: 1 / 1;
}

.pg-primegear-transition-icon {
  overflow: visible;
  color: var(--pg-transition-fg);
}

.pg-primegear-transition__body {
  transform: none;
}

.pg-primegear-transition__shape,
.pg-primegear-transition__ball {
  fill: currentColor;
}

/* 頭上の球だけを独立して動かす */
.pg-primegear-transition__ball {
  transform-box: fill-box;
  transform-origin: center;
  will-change: transform;
  backface-visibility: hidden;
}

/*
 * 通常の目は黒目ではなく「穴」そのもの。
 * 背景色を変更しても穴が同じ基調色になるようsolid背景色を使う。
 */
.pg-primegear-transition__eye {
  fill: var(--pg-transition-bg-solid, #0c0d0f);
  transform-box: fill-box;
  transform-origin: center;
  will-change: transform, opacity;
  backface-visibility: hidden;
}

/* 2つの目を1セットとして滑らかに左右へ動かす */
.pg-primegear-transition__eyes-shift {
  transform-box: view-box;
  transform-origin: center;
  will-change: transform;
  backface-visibility: hidden;
}

/* レア表情。通常時は完全に非表示 */
.pg-primegear-transition__heart-eyes {
  opacity: 0;
  transform-box: fill-box;
  transform-origin: center;
  will-change: transform, opacity;
  pointer-events: none;
}

.pg-primegear-transition__heart {
  fill: var(--pg-primegear-transition-red, #B00000);
}

/* =========================================================
   出現
   表情自体は transition.js の Web Animations API で制御。
========================================================= */
.pg-transition.is-initial .pg-transition__visual,
.pg-transition.is-exiting .pg-transition__visual {
  animation: pg-primegear-visual-in 200ms ease-out both;
}

/* 新ページ側でも表情を再生し、ページ本体を半透明幕の下に見せたまま待つ */
.pg-transition.is-resuming .pg-transition__visual {
  opacity: 1;
  transform: none;
}


@keyframes pg-primegear-visual-in {
  from { opacity: 0; }
  to   { opacity: 1; }
}

@media (prefers-reduced-motion: reduce) {
  .pg-transition.is-leaving .pg-transition__curtain {
    opacity: 0;
    transform: none;
    transition: opacity 90ms linear;
  }

  .pg-transition.is-leaving .pg-transition__backdrop {
    opacity: 0;
    transition: opacity 90ms linear;
  }

  .pg-transition__curtain::after {
    display: none;
  }

  .pg-primegear-transition__eyes-shift,
  .pg-primegear-transition__eye,
  .pg-primegear-transition__ball,
  .pg-primegear-transition__heart-eyes,
  .pg-transition__visual {
    animation: none !important;
    transform: none !important;
  }

  .pg-primegear-transition__heart-eyes {
    opacity: 0 !important;
  }
}