/* ========================================
   Opening Animation - 雲の王国
   ======================================== */

.opening-overlay {
  position: fixed;
  inset: 0;
  z-index: 9999;
  background: #030408;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: opacity 1s ease;
  overflow: hidden;
}

/* 星空エフェクト (pure CSS) */
.opening-overlay::before {
  content: '';
  position: absolute;
  inset: 0;
  background-image:
    radial-gradient(1px 1px at 12% 18%, rgba(255,255,255,0.7) 0%, transparent 100%),
    radial-gradient(1px 1px at 78% 12%, rgba(255,255,255,0.5) 0%, transparent 100%),
    radial-gradient(1.5px 1.5px at 48% 72%, rgba(255,255,255,0.6) 0%, transparent 100%),
    radial-gradient(1px 1px at 88% 55%, rgba(255,255,255,0.4) 0%, transparent 100%),
    radial-gradient(1px 1px at 25% 88%, rgba(255,255,255,0.5) 0%, transparent 100%),
    radial-gradient(1px 1px at 62% 35%, rgba(255,255,255,0.6) 0%, transparent 100%),
    radial-gradient(1.5px 1.5px at 38% 22%, rgba(255,255,255,0.4) 0%, transparent 100%),
    radial-gradient(1px 1px at 92% 80%, rgba(255,255,255,0.5) 0%, transparent 100%),
    radial-gradient(1px 1px at 5%  45%, rgba(255,255,255,0.4) 0%, transparent 100%),
    radial-gradient(1px 1px at 70% 92%, rgba(255,255,255,0.3) 0%, transparent 100%);
  animation: starsTwinkle 5s ease-in-out infinite alternate;
}

.opening-overlay::after {
  content: '';
  position: absolute;
  inset: 0;
  background-image:
    radial-gradient(1px 1px at 33% 8%,  rgba(255,255,255,0.5) 0%, transparent 100%),
    radial-gradient(1px 1px at 55% 50%, rgba(255,255,255,0.4) 0%, transparent 100%),
    radial-gradient(1.5px 1.5px at 18% 62%, rgba(255,255,255,0.6) 0%, transparent 100%),
    radial-gradient(1px 1px at 82% 28%, rgba(255,255,255,0.3) 0%, transparent 100%),
    radial-gradient(1px 1px at 42% 95%, rgba(255,255,255,0.5) 0%, transparent 100%),
    radial-gradient(1px 1px at 95% 15%, rgba(255,255,255,0.4) 0%, transparent 100%);
  animation: starsTwinkle 5s ease-in-out 2.5s infinite alternate;
}

@keyframes starsTwinkle {
  from { opacity: 0.5; }
  to   { opacity: 1;   }
}

/* オーバーレイ フェードアウト */
.opening-overlay.hide {
  opacity: 0;
  pointer-events: none;
}

/* ----------------------------------------
   ロゴ wrapper
   ---------------------------------------- */
.opening-logo-wrap {
  position: relative;
  z-index: 1;
  text-align: center;

  /* 初期状態: 非表示 */
  opacity: 0;
  transform: scale(0.92) translateY(14px);
  filter: blur(8px);
  transition:
    opacity   1.2s ease,
    transform 1.4s cubic-bezier(0.16, 1, 0.3, 1),
    filter    1.2s ease;
}

/* ロゴ 表示 */
.opening-logo-wrap.show {
  opacity: 1;
  transform: scale(1) translateY(0);
  filter: blur(0);
}

/* ロゴ 退場 */
.opening-logo-wrap.fade-out {
  opacity: 0;
  transform: scale(1.05);
  filter: blur(4px);
  transition: opacity 0.7s ease, transform 0.9s ease, filter 0.7s ease;
}

/* ロゴ画像 */
.opening-logo-img {
  max-width: 520px;
  max-height: 280px;
  width: 65vw;
  margin: 0 auto;
  filter: drop-shadow(0 0 40px rgba(200, 168, 75, 0.45));
}

/* ----------------------------------------
   テキスト フォールバック
   (images/logo/title_logo.png がない場合に表示)
   ---------------------------------------- */
.opening-logo-text {
  padding: 0 24px;
}

.opening-title-en {
  font-family: 'Noto Serif JP', serif;
  font-size: clamp(0.75rem, 2.5vw, 1.1rem);
  font-weight: 700;
  letter-spacing: 0.4em;
  color: #c8a84b;
  margin-bottom: 16px;
  text-shadow: 0 0 30px rgba(200, 168, 75, 0.6);
}

.opening-title-ja {
  font-family: 'Noto Serif JP', serif;
  font-size: clamp(2.8rem, 9vw, 5.5rem);
  font-weight: 700;
  letter-spacing: 0.35em;
  padding-right: 0.35em; /* letter-spacing 右端の余白を補正 */
  color: #ffffff;
  text-shadow:
    0 0 50px rgba(74, 158, 222, 0.5),
    0 0 100px rgba(74, 158, 222, 0.2);
  line-height: 1.2;
}

/* タイトル下の装飾ライン */
.opening-title-ja::after {
  content: '';
  display: block;
  width: 55%;
  height: 1px;
  background: linear-gradient(to right, transparent, #c8a84b, transparent);
  margin: 20px auto 0;
}