/* ============================================================
   THEATER MODE (FEATURED MUSIC IMPERSIVE EXPERIENCE)
   ============================================================ */

.theater-modal {
  position: fixed;
  inset: 0;
  z-index: 9999;
  display: flex;
  align-items: center;
  justify-content: center;
  pointer-events: none;
  opacity: 0;
  /* visibility:hidden で非表示中は一切描画しない（bg-journey フラッシュ防止）*/
  visibility: hidden;
  transition: opacity 1.5s ease, visibility 0s linear 1.5s;
}

.theater-modal.is-open {
  pointer-events: auto;
  opacity: 1;
  visibility: visible;
  transition: opacity 1.5s ease, visibility 0s linear 0s;
}

.theater-bg {
  position: absolute;
  inset: 0;
  background: #030403; /* Deep dark, slightly greenish */
  z-index: 1;
  transition: background 1.5s ease;
}

.theater-window {
  position: relative;
  z-index: 2;
  width: min(94vw, 1300px);
  aspect-ratio: 16 / 9;
  transform: scale(0.95);
  transition: transform 1.5s cubic-bezier(0.2, 0.8, 0.2, 1);
}

.theater-modal.is-open .theater-window {
  transform: scale(1);
}

/* Removed hard glass border for seamless portal effect */

.theater-scenery {
  position: absolute;
  inset: -15%; /* 枠をさらに広げ、フェードの距離を十分に確保 */
  background-image: url('../images/history/bg-journey.png');
  background-size: cover;
  background-position: center;
  filter: brightness(0.8) contrast(1.1);
  transition: filter 2s ease;
  /* 複数のポイントで透明度をコントロールし、圧倒的に滑らかなグラデーションを作る */
  mask-image: radial-gradient(ellipse at center, 
    rgba(0,0,0,1) 15%, 
    rgba(0,0,0,0.8) 35%, 
    rgba(0,0,0,0.3) 55%, 
    rgba(0,0,0,0) 72%
  );
  -webkit-mask-image: radial-gradient(ellipse at center, 
    rgba(0,0,0,1) 15%, 
    rgba(0,0,0,0.8) 35%, 
    rgba(0,0,0,0.3) 55%, 
    rgba(0,0,0,0) 72%
  );
}

/* Particles layer (fireflies) */
.theater-particles {
  position: absolute;
  inset: 0;
  pointer-events: none;
  z-index: 3;
}

/* UI Layer */
.theater-ui {
  position: absolute;
  inset: 0;
  z-index: 10;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  padding: 2rem 3rem;
  opacity: 0;
  pointer-events: none; /* Let clicks pass through the invisible parts */
  transition: opacity 1.2s ease 0.5s;
}

.theater-modal.is-open .theater-ui {
  opacity: 1;
}

.theater-top, .theater-bottom {
  pointer-events: auto; /* Buttons remain clickable */
}

.theater-top {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
}

.theater-controls-top {
  display: flex;
  align-items: center;
  gap: 1.5rem;
}

/* ── 帰還 + 全画面のペア ─────────────────────────────── */
.theater-controls-top-pair {
  display: flex;
  align-items: stretch;
  border: 1px solid rgba(255, 255, 255, 0.15);
  border-radius: 1px;
  overflow: hidden;
  backdrop-filter: blur(4px);
}

.theater-controls-top-pair__sep {
  display: block;
  width: 1px;
  background: rgba(255, 255, 255, 0.15);
  flex-shrink: 0;
}

.theater-return-btn {
  background: transparent;
  border: none;
  color: rgba(255, 255, 255, 0.6);
  padding: 0.4rem 1.4rem;
  font-family: var(--font-serif-jp, serif);
  font-size: 0.85rem;
  letter-spacing: 0.25em;
  cursor: pointer;
  transition: all 0.4s ease;
  border-radius: 0;
}

.theater-return-btn:hover {
  background: rgba(255, 255, 255, 0.06);
  color: #fff;
  letter-spacing: 0.32em;
}

.theater-fullscreen-btn {
  background: transparent;
  border: none;
  color: rgba(255, 255, 255, 0.4);
  padding: 0.4rem 1.1rem;
  font-family: var(--font-serif-jp, serif);
  font-size: 0.85rem;
  letter-spacing: 0.2em;
  cursor: pointer;
  transition: all 0.4s ease;
  border-radius: 0;
  white-space: nowrap;
}

.theater-fullscreen-btn:hover {
  background: rgba(255, 255, 255, 0.06);
  color: #fff;
  letter-spacing: 0.28em;
}

.theater-close {
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid rgba(255, 255, 255, 0.1);
  border-radius: 50%;
  width: 44px;
  height: 44px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: rgba(255, 255, 255, 0.6);
  cursor: pointer;
  transition: all 0.3s ease;
  backdrop-filter: blur(4px);
}
.theater-close:hover {
  background: rgba(255, 255, 255, 0.15);
  color: rgba(255, 255, 255, 1);
  transform: scale(1.05);
}

.theater-bottom {
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
}

.theater-info {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.theater-title {
  font-family: var(--font-serif-jp, serif);
  font-size: 2rem;
  font-weight: 300;
  color: rgba(255, 250, 240, 0.95);
  letter-spacing: 0.05em;
  text-shadow: 0 2px 12px rgba(0,0,0,0.8);
  margin: 0;
}

.theater-composer {
  font-family: var(--font-display, sans-serif);
  font-size: 0.8rem;
  letter-spacing: 0.2em;
  color: rgba(255, 255, 255, 0.5);
  margin: 0;
}

.theater-play-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 64px;
  height: 64px;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid rgba(255, 255, 255, 0.15);
  color: rgba(255, 255, 255, 0.85);
  cursor: pointer;
  transition: all 0.4s ease;
  backdrop-filter: blur(8px);
}
.theater-play-btn:hover {
  background: rgba(255, 255, 255, 0.15);
  border-color: rgba(255, 255, 255, 0.3);
  color: #fff;
  transform: scale(1.05);
  box-shadow: 0 0 24px rgba(255, 255, 255, 0.1);
}

.theater-controls {
  display: flex;
  align-items: center;
  gap: 1.5rem;
}

.theater-sub-btn {
  background: transparent;
  border: none;
  color: rgba(255, 255, 255, 0.5);
  cursor: pointer;
  transition: all 0.3s ease;
  display: flex;
  align-items: center;
  justify-content: center;
  width: 48px;
  height: 48px;
  border-radius: 50%;
  text-decoration: none;
}
.theater-sub-btn:hover {
  color: #fff;
  background: rgba(255, 255, 255, 0.1);
  transform: scale(1.1);
}

.theater-btn-fav.is-fav {
  color: #e25555;
}
.theater-btn-fav.is-fav .icon-fav-off { display: none; }
.theater-btn-fav.is-fav .icon-fav-on { display: block !important; }

/* Navigation Arrows */
@keyframes nav-float-prev {
  0%, 100% { transform: translateY(-50%) translateX(0); box-shadow: 0 0 0 rgba(255,255,255,0); opacity: 0.6; }
  50%      { transform: translateY(-50%) translateX(-10px); box-shadow: 0 0 20px rgba(255,255,255,0.15); opacity: 1; }
}
@keyframes nav-float-next {
  0%, 100% { transform: translateY(-50%) translateX(0); box-shadow: 0 0 0 rgba(255,255,255,0); opacity: 0.6; }
  50%      { transform: translateY(-50%) translateX(10px); box-shadow: 0 0 20px rgba(255,255,255,0.15); opacity: 1; }
}

.theater-nav {
  position: absolute;
  top: 50%;
  background: rgba(255, 255, 255, 0.1);
  border: 1px solid rgba(255, 255, 255, 0.2);
  border-radius: 50%;
  width: 72px;
  height: 72px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: rgba(255, 255, 255, 0.9);
  cursor: pointer;
  transition: all 0.3s ease;
  pointer-events: auto;
  z-index: 20;
}
.theater-nav-prev {
  left: 3vw;
  animation: nav-float-prev 3s ease-in-out infinite;
}
.theater-nav-next {
  right: 3vw;
  animation: nav-float-next 3s ease-in-out infinite;
}
.theater-nav:hover {
  background: rgba(255, 255, 255, 0.25);
  border-color: rgba(255, 255, 255, 0.5);
  color: #fff;
  animation-play-state: paused;
  transform: translateY(-50%) scale(1.15) !important;
  box-shadow: 0 0 30px rgba(255,255,255,0.3) !important;
  opacity: 1 !important;
}

/* Feature Music entry point */
/* Feature Music entry point (Theater Gate) */
.featured-music {
  padding: 8rem 0 4rem;
  position: relative;
  overflow: hidden;
  background: #050605; /* Blackish background for the altar feel */
}
.featured-music::before {
  content: '';
  position: absolute;
  top: 50%;
  left: 50%;
  width: 100%;
  height: 100%;
  background: radial-gradient(circle at center, rgba(209, 184, 122, 0.04) 0%, transparent 70%);
  transform: translate(-50%, -50%);
  pointer-events: none;
  z-index: 0;
}

/* Updated Gate Design */
.fm-card {
  position: relative;
  width: min(100%, 1000px);
  margin: 4rem auto 0;
  aspect-ratio: 21 / 9;
  min-height: 380px;
  cursor: pointer;
  border-radius: 2px;
  background: #000;
  box-shadow: 0 40px 100px rgba(0,0,0,0.9);
  transition: all 0.8s cubic-bezier(0.16, 1, 0.3, 1);
  display: flex;
  align-items: center;
  justify-content: center;
  border: 1px solid rgba(255, 255, 255, 0.03);
}

.fm-card:hover {
  transform: translateY(-4px) scale(1.01);
  border-color: rgba(209, 184, 122, 0.2);
  box-shadow: 0 50px 120px rgba(0,0,0,1), 0 0 40px rgba(209, 184, 122, 0.1);
}

.fm-card-bg {
  position: absolute;
  inset: 0;
  background-size: cover;
  background-position: center;
  opacity: 0.4;
  filter: grayscale(0.5) brightness(0.6);
  transition: all 1.2s cubic-bezier(0.16, 1, 0.3, 1);
}

.fm-card:hover .fm-card-bg {
  opacity: 0.6;
  filter: grayscale(0.2) brightness(0.8);
  transform: scale(1.05);
}

.fm-card-overlay {
  position: absolute;
  inset: 0;
  background: radial-gradient(circle at center, transparent 20%, rgba(0,0,0,0.8) 100%);
  z-index: 1;
  pointer-events: none;
}

.fm-card-content {
  position: relative;
  z-index: 2;
  text-align: center;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 1.5rem;
  padding: 2rem;
  pointer-events: none; /* Make clicks pass to .fm-card */
}

.fm-tag {
  font-family: var(--font-display, sans-serif);
  font-size: 0.7rem;
  letter-spacing: 0.5em;
  color: rgba(209, 184, 122, 0.6);
  text-transform: uppercase;
  margin: 0;
}

.fm-title {
  font-family: var(--font-serif-jp, serif);
  font-size: clamp(2rem, 5vw, 3.2rem);
  font-weight: 200;
  color: #fff;
  letter-spacing: 0.2em;
  margin: 0;
  text-shadow: 0 0 30px rgba(0,0,0,0.5);
  transition: all 0.8s ease;
}

.fm-card:hover .fm-title {
  letter-spacing: 0.25em;
  text-shadow: 0 0 40px rgba(209, 184, 122, 0.3);
}

.fm-composer {
  font-family: var(--font-display, sans-serif);
  font-size: 0.75rem;
  letter-spacing: 0.2em;
  color: rgba(255, 255, 255, 0.3);
  margin: 0;
}

.fm-play-indicator {
  margin-top: 1rem;
  display: flex;
  align-items: center;
  gap: 1rem;
  font-size: 0.8rem;
  letter-spacing: 0.3em;
  color: rgba(255, 255, 255, 0.5);
  transition: all 0.5s ease;
}

.fm-play-indicator svg {
  opacity: 0.5;
  transition: all 0.5s ease;
}

.fm-card:hover .fm-play-indicator {
  color: #fff;
}
.fm-card:hover .fm-play-indicator svg {
  opacity: 1;
  transform: translateX(4px);
  filter: drop-shadow(0 0 8px rgba(255,255,255,0.5));
}


/* Fullscreen Special States */
.theater-modal.is-fullscreen .theater-window {
  width: 100vw;
  height: 100vh;
  max-width: none;
  aspect-ratio: auto;
  transform: scale(1) !important;
}

.theater-modal.is-fullscreen .theater-scenery {
  inset: 0;
  mask-image: none;
  -webkit-mask-image: none;
  filter: brightness(0.9) contrast(1.1);
}

.theater-modal.is-fullscreen .theater-ui {
  padding: clamp(2rem, 8vh, 6rem) clamp(2rem, 8vw, 8rem);
}

.theater-modal.is-fullscreen .theater-title {
  font-size: clamp(2rem, 6vh, 4rem);
}

.theater-modal.is-fullscreen .theater-nav-prev { left: 5vw; }
.theater-modal.is-fullscreen .theater-nav-next { right: 5vw; }

/* 全画面中：縮小ボタンをグレーアウト（帰還が主アクション） */
.theater-modal.is-fullscreen .theater-fullscreen-btn {
  color: rgba(255, 255, 255, 0.18);
  pointer-events: none;
  cursor: default;
}
.theater-modal.is-fullscreen .theater-controls-top-pair__sep {
  background: rgba(255, 255, 255, 0.06);
}

/* ── Scene button (top-left) ───────────────────────────── */
.theater-controls-top-left {
  display: flex;
  align-items: center;
}

.theater-scene-btn {
  background: transparent;
  border: 1px solid rgba(255, 255, 255, 0.15);
  color: rgba(255, 255, 255, 0.55);
  padding: 0.4rem 1.2rem;
  font-family: var(--font-serif-jp, serif);
  font-size: 0.8rem;
  letter-spacing: 0.25em;
  cursor: pointer;
  transition: all 0.4s ease;
  border-radius: 1px;
  backdrop-filter: blur(4px);
}
.theater-scene-btn:hover {
  background: rgba(255, 255, 255, 0.05);
  border-color: rgba(255, 255, 255, 0.4);
  color: #fff;
}

/* ── Info area (left column of theater-bottom) ─────────── */
.theater-info-area {
  display: flex;
  flex-direction: column;
  gap: 0.55rem;
  min-width: 0;
  max-width: 55%;
}

/* ── Seekbar ───────────────────────────────────────────── */
.theater-seekbar-area {
  display: flex;
  align-items: center;
  gap: 0.6rem;
}

.theater-time {
  font-family: var(--font-display, sans-serif);
  font-size: 0.72rem;
  letter-spacing: 0.05em;
  color: rgba(255, 255, 255, 0.45);
  min-width: 2.4em;
  text-align: center;
  flex-shrink: 0;
}

.theater-seekbar {
  -webkit-appearance: none;
  appearance: none;
  flex: 1;
  height: 3px;
  background: rgba(255, 255, 255, 0.18);
  border-radius: 2px;
  cursor: pointer;
  outline: none;
  transition: height 0.2s ease;
}
.theater-seekbar:hover {
  height: 5px;
}
.theater-seekbar::-webkit-slider-thumb {
  -webkit-appearance: none;
  width: 13px;
  height: 13px;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.88);
  cursor: pointer;
  box-shadow: 0 0 6px rgba(255,255,255,0.4);
  transition: transform 0.15s ease;
}
.theater-seekbar:hover::-webkit-slider-thumb {
  transform: scale(1.2);
}
.theater-seekbar::-moz-range-thumb {
  width: 13px;
  height: 13px;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.88);
  cursor: pointer;
  border: none;
}
.theater-seekbar::-webkit-slider-runnable-track {
  height: 3px;
  background: rgba(255, 255, 255, 0.18);
  border-radius: 2px;
}

/* ── License area ──────────────────────────────────────── */
.theater-license-area {
  display: flex;
  align-items: center;
  gap: 0.8rem;
  flex-wrap: wrap;
}

.theater-license-text {
  font-family: var(--font-display, sans-serif);
  font-size: 0.7rem;
  letter-spacing: 0.08em;
  color: rgba(255, 255, 255, 0.35);
}

.theater-license-link {
  font-family: var(--font-display, sans-serif);
  font-size: 0.7rem;
  letter-spacing: 0.1em;
  color: rgba(209, 184, 122, 0.7);
  text-decoration: none;
  border-bottom: 1px solid rgba(209, 184, 122, 0.3);
  transition: all 0.3s ease;
  white-space: nowrap;
}
.theater-license-link:hover {
  color: rgba(209, 184, 122, 1);
  border-bottom-color: rgba(209, 184, 122, 0.8);
}

/* ── Loop / Share buttons ──────────────────────────────── */
.theater-btn-loop {
  color: rgba(255, 255, 255, 0.35);
}
.theater-btn-loop.is-active {
  color: rgba(140, 210, 170, 0.9);
  background: rgba(140, 210, 170, 0.08);
}

.theater-btn-share {
  color: rgba(255, 255, 255, 0.4);
}

/* ── Ken Burns effect ──────────────────────────────────── */
@keyframes kenburns {
  0%   { background-position: 50% 50%; transform: scale(1.00); }
  25%  { background-position: 48% 52%; transform: scale(1.05); }
  50%  { background-position: 52% 48%; transform: scale(1.07); }
  75%  { background-position: 49% 51%; transform: scale(1.04); }
  100% { background-position: 50% 50%; transform: scale(1.00); }
}

.theater-modal.is-playing .theater-scenery {
  animation: kenburns 35s ease-in-out infinite;
}

/* ── Scene Picker — Left Side Panel ─────────────────────── */
.theater-scene-picker {
  position: absolute;
  top: 0;
  left: 0;
  bottom: 0;
  width: 280px;
  z-index: 28;
  display: flex;
  flex-direction: column;
  background: rgba(4, 4, 3, 0.92);
  backdrop-filter: blur(12px);
  border-right: 1px solid rgba(255, 255, 255, 0.08);
  transform: translateX(-100%);
  transition: transform 0.35s cubic-bezier(0.25, 0.46, 0.45, 0.94);
}
.theater-scene-picker[hidden] {
  display: flex !important;
  visibility: hidden;
  pointer-events: none;
}
.theater-scene-picker.is-open {
  transform: translateX(0);
  visibility: visible;
  pointer-events: auto;
}

.theater-scene-picker__header {
  display: flex;
  align-items: center;
  padding: 1.1rem 1.2rem 0.9rem;
  border-bottom: 1px solid rgba(255, 255, 255, 0.07);
  flex-shrink: 0;
}

.theater-scene-picker__title {
  font-family: var(--font-serif-jp, serif);
  font-size: 0.82rem;
  letter-spacing: 0.3em;
  color: rgba(255, 255, 255, 0.6);
  margin: 0;
  flex: 1;
}

.theater-scene-picker__close {
  background: transparent;
  border: none;
  color: rgba(255, 255, 255, 0.35);
  cursor: pointer;
  padding: 4px;
  display: flex;
  align-items: center;
  transition: color 0.2s;
  flex-shrink: 0;
}
.theater-scene-picker__close:hover { color: rgba(255, 255, 255, 0.8); }

.theater-scene-picker__body {
  flex: 1;
  overflow-y: auto;
  padding: 0.6rem 0 1rem;
  scrollbar-width: thin;
  scrollbar-color: rgba(255, 255, 255, 0.1) transparent;
}
.theater-scene-picker__body::-webkit-scrollbar { width: 3px; }
.theater-scene-picker__body::-webkit-scrollbar-track { background: transparent; }
.theater-scene-picker__body::-webkit-scrollbar-thumb { background: rgba(255,255,255,0.12); border-radius: 2px; }

/* カテゴリグループ */
.theater-scene-group {
  padding: 0.5rem 0 0.3rem;
}
.theater-scene-group + .theater-scene-group {
  border-top: 1px solid rgba(255, 255, 255, 0.05);
}

.theater-scene-group__label {
  font-family: var(--font-display, sans-serif);
  font-size: 0.62rem;
  letter-spacing: 0.3em;
  color: rgba(255, 255, 255, 0.25);
  padding: 0.3rem 1.2rem 0.4rem;
  text-transform: uppercase;
}

.theater-scene-group__tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
  padding: 0.2rem 1rem 0.4rem;
}

.theater-scene-tag {
  background: transparent;
  border: 1px solid rgba(255, 255, 255, 0.1);
  color: rgba(255, 255, 255, 0.55);
  padding: 0.3rem 0.75rem;
  font-family: var(--font-serif-jp, serif);
  font-size: 0.75rem;
  letter-spacing: 0.1em;
  cursor: pointer;
  border-radius: 1px;
  transition: all 0.2s ease;
  white-space: nowrap;
}
.theater-scene-tag:hover {
  background: rgba(209, 184, 122, 0.1);
  border-color: rgba(209, 184, 122, 0.4);
  color: rgba(209, 184, 122, 0.95);
}

/* ── Controls top-left gap ───────────────────────────────── */
.theater-controls-top-left {
  gap: 0.7rem;
}

/* ── Volume bar ──────────────────────────────────────────── */
.theater-volume-area {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  margin-left: 0.4rem;
}

.theater-volume-bar {
  -webkit-appearance: none;
  appearance: none;
  width: 80px;
  height: 3px;
  background: rgba(255, 255, 255, 0.18);
  border-radius: 2px;
  cursor: pointer;
  outline: none;
  transition: height 0.15s ease;
}
.theater-volume-bar:hover {
  height: 5px;
}
.theater-volume-bar::-webkit-slider-thumb {
  -webkit-appearance: none;
  width: 11px;
  height: 11px;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.85);
  cursor: pointer;
  box-shadow: 0 0 4px rgba(255, 255, 255, 0.4);
  transition: transform 0.15s ease;
}
.theater-volume-bar:hover::-webkit-slider-thumb {
  transform: scale(1.2);
}
.theater-volume-bar::-moz-range-thumb {
  width: 11px;
  height: 11px;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.85);
  border: none;
  cursor: pointer;
}
.theater-volume-bar::-webkit-slider-runnable-track {
  height: 3px;
  background: rgba(255, 255, 255, 0.18);
  border-radius: 2px;
}

/* ── Auto-hide controls (cinema mode) ───────────────────── */
.theater-top,
.theater-bottom {
  transition: opacity 0.5s ease;
}

.theater-modal.controls-hidden .theater-top,
.theater-modal.controls-hidden .theater-bottom {
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.8s ease;
}

.theater-modal.controls-hidden .theater-nav {
  opacity: 0 !important;
  pointer-events: none;
  animation: none !important;
  transition: opacity 0.8s ease !important;
}

.theater-modal.controls-hidden {
  cursor: none;
}

/* ══════════════════════════════════════════════════════════
   Mobile — Portrait (〜768px)
   PC版を縮小するのではなく、モバイル専用レイアウトとして再設計
   ══════════════════════════════════════════════════════════ */
@media (max-width: 768px) {

  /* ── ウィンドウをビューポート全体に ── */
  .theater-window {
    width: 100%;
    height: 100%;
    aspect-ratio: unset;
    transform: none !important;
    border-radius: 0;
  }
  .theater-modal.is-open .theater-window {
    transform: none !important;
  }
  .theater-scenery {
    inset: 0;
    mask-image: none;
    -webkit-mask-image: none;
    filter: brightness(0.72) contrast(1.05);
  }

  /* ── UI レイヤー：パディングをゼロにして各セクションが管理 ── */
  .theater-ui {
    padding: 0;
    padding-top: env(safe-area-inset-top, 0px);
    padding-bottom: env(safe-area-inset-bottom, 0px);
    display: flex;
    flex-direction: column;
    justify-content: space-between;
  }

  /* ══ TOP BAR ══
     左: 情景ボタンのみ（小）
     右: 帰還 + × 閉じる                    */
  .theater-top {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 10px 16px;
    min-height: 52px;
    background: linear-gradient(to bottom, rgba(0,0,0,0.45) 0%, transparent 100%);
    flex-shrink: 0;
  }

  /* 左側：情景ボタンのみ表示。お気に入り・足跡ボタンは非表示 */
  .theater-controls-top-left {
    display: flex;
    gap: 0.35rem;
    align-items: center;
    flex-shrink: 0;
  }
  .theater-fav-list-btn,
  .theater-footprints-btn {
    display: none;
  }
  .theater-scene-btn {
    font-size: 0.63rem;
    padding: 0.28rem 0.6rem;
    letter-spacing: 0.06em;
    white-space: nowrap;
  }

  /* 右側：帰還ボタン + × */
  .theater-controls-top {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    flex-shrink: 0;
  }
  .theater-controls-top-pair {
    display: flex;
    border: 1px solid rgba(255,255,255,0.18);
    border-radius: 1px;
    overflow: hidden;
  }
  /* モバイルは全画面 API 非対応 (iOS) のため全画面ボタン・セパレータを非表示 */
  .theater-fullscreen-btn,
  .theater-controls-top-pair__sep {
    display: none;
  }
  .theater-return-btn {
    font-size: 0.7rem;
    padding: 0.3rem 0.8rem;
    letter-spacing: 0.12em;
    border: none;
  }
  .theater-close {
    width: 40px;
    height: 40px;
    flex-shrink: 0;
  }

  /* ══ NAV 矢印：両端に寄せ、コンテンツと干渉しないサイズに ══ */
  .theater-nav {
    width: 40px;
    height: 40px;
    background: rgba(255,255,255,0.06);
    border-color: rgba(255,255,255,0.12);
    animation-play-state: paused; /* モバイルはフロートアニメ停止 */
  }
  .theater-nav svg {
    width: 22px;
    height: 22px;
  }
  .theater-nav-prev {
    left: 0;
    animation: none;
  }
  .theater-nav-next {
    right: 0;
    animation: none;
  }

  /* ══ BOTTOM：曲情報 → シークバー → ボタン群（縦積み） ══ */
  .theater-bottom {
    display: flex;
    flex-direction: column;
    align-items: stretch;
    gap: 0.55rem;
    padding: 12px 20px max(16px, env(safe-area-inset-bottom, 16px));
    background: linear-gradient(to top, rgba(0,0,0,0.6) 0%, transparent 100%);
    flex-shrink: 0;
  }

  /* 曲情報エリア：全幅 */
  .theater-info-area {
    max-width: 100%;
    gap: 0.3rem;
  }
  .theater-info {
    gap: 0.2rem;
  }
  .theater-title {
    font-size: 1.2rem;
    letter-spacing: 0.04em;
    line-height: 1.3;
  }
  .theater-composer {
    font-size: 0.67rem;
    letter-spacing: 0.12em;
  }
  .theater-seekbar-area {
    gap: 0.4rem;
    margin-top: 0.1rem;
  }
  .theater-time {
    font-size: 0.6rem;
    min-width: 2em;
  }
  .theater-license-area { display: none; }
  .theater-volume-area  { display: none; }

  /* コントロールボタン行：アイコンのみ、中央寄せ */
  .theater-controls {
    display: flex;
    flex-direction: row;
    align-items: center;
    justify-content: center;
    gap: 0.15rem;
    flex-wrap: nowrap;
  }
  .theater-sub-btn {
    width: 44px;
    height: 44px;
    flex-shrink: 0;
  }
  /* 「足跡を残す」テキスト非表示、アイコンのみ */
  .theater-btn-footprint span { display: none; }

  /* 再生ボタン：少し大きめ */
  .theater-play-btn {
    width: 56px;
    height: 56px;
    flex-shrink: 0;
  }

  /* ══ パネル類 ══ */

  /* お気に入りパネル：画面右全幅 */
  .theater-fav-panel {
    width: 100%;
    max-width: 100%;
  }

  /* 情景ピッカー：下からのシートに変更 */
  .theater-scene-picker {
    width: 100%;
    top: auto;
    left: 0;
    right: 0;
    bottom: 0;
    height: 65%;
    border-right: none;
    border-top: 1px solid rgba(255,255,255,0.08);
    transform: translateY(100%);
  }
  .theater-scene-picker.is-open {
    transform: translateY(0);
  }

  /* シェアポップアップ：右上に出る */
  .theater-share-popup {
    right: 0;
    left: auto;
    bottom: calc(100% + 6px);
  }
}

/* ══════════════════════════════════════════════════════════
   Mobile — Landscape（横画面 / max-height 500px）
   ══════════════════════════════════════════════════════════ */
@media (max-height: 500px) and (orientation: landscape) {
  .theater-window {
    width: 100%;
    height: 100%;
    aspect-ratio: unset;
    transform: none !important;
  }
  .theater-modal.is-open .theater-window {
    transform: none !important;
  }
  .theater-scenery {
    inset: 0;
    mask-image: none;
    -webkit-mask-image: none;
  }

  .theater-ui {
    padding: 0;
    padding-left: env(safe-area-inset-left, 0px);
    padding-right: env(safe-area-inset-right, 0px);
  }

  .theater-top {
    padding: 6px 16px;
    min-height: 44px;
    background: linear-gradient(to bottom, rgba(0,0,0,0.5) 0%, transparent 100%);
    flex-shrink: 0;
  }
  .theater-fav-list-btn,
  .theater-footprints-btn { display: none; }
  .theater-fullscreen-btn,
  .theater-controls-top-pair__sep { display: none; }
  .theater-return-btn {
    font-size: 0.65rem;
    padding: 0.25rem 0.7rem;
  }
  .theater-close { width: 36px; height: 36px; }

  .theater-nav { width: 36px; height: 36px; animation: none; }
  .theater-nav-prev { left: 0; }
  .theater-nav-next { right: 0; }

  /* 横画面は左右並列でコンパクトに */
  .theater-bottom {
    flex-direction: row;
    align-items: flex-end;
    padding: 8px 16px max(10px, env(safe-area-inset-bottom, 10px));
    background: linear-gradient(to top, rgba(0,0,0,0.6) 0%, transparent 100%);
    gap: 1rem;
    flex-shrink: 0;
  }
  .theater-info-area {
    max-width: 55%;
    gap: 0.2rem;
    flex: 1;
  }
  .theater-title { font-size: 0.95rem; }
  .theater-composer { font-size: 0.6rem; }
  .theater-time { font-size: 0.58rem; }
  .theater-play-btn { width: 44px; height: 44px; }
  .theater-sub-btn { width: 38px; height: 38px; }
  .theater-btn-footprint span { display: none; }
  .theater-controls { gap: 0.1rem; flex-wrap: nowrap; }
  .theater-license-area { display: none; }
  .theater-volume-area  { display: none; }

  .theater-scene-picker {
    width: 100%;
    top: auto;
    left: 0; right: 0; bottom: 0;
    height: 75%;
    border-right: none;
    border-top: 1px solid rgba(255,255,255,0.08);
    transform: translateY(100%);
  }
  .theater-scene-picker.is-open { transform: translateY(0); }
}

/* ══════════════════════════════════════════════════════════
   Share Popup
   ══════════════════════════════════════════════════════════ */
.theater-share-wrap {
  position: relative;
}

.theater-share-popup {
  position: absolute;
  bottom: calc(100% + 10px);
  right: -4px;
  background: rgba(6, 6, 5, 0.95);
  border: 1px solid rgba(255, 255, 255, 0.1);
  border-radius: 2px;
  backdrop-filter: blur(12px);
  padding: 0.4rem;
  display: flex;
  flex-direction: column;
  gap: 2px;
  min-width: 140px;
  z-index: 50;
  animation: share-popup-in 0.18s ease;
}
.theater-share-popup[hidden] { display: none; }

@keyframes share-popup-in {
  from { opacity: 0; transform: translateY(6px); }
  to   { opacity: 1; transform: translateY(0); }
}

.theater-share-item {
  display: flex;
  align-items: center;
  gap: 0.7rem;
  background: transparent;
  border: none;
  color: rgba(255, 250, 240, 0.65);
  cursor: pointer;
  font-family: var(--font-display, sans-serif);
  font-size: 0.76rem;
  letter-spacing: 0.06em;
  padding: 0.5rem 0.75rem;
  border-radius: 1px;
  transition: background 0.15s, color 0.15s;
  width: 100%;
  text-align: left;
}
.theater-share-item:hover {
  background: rgba(255, 255, 255, 0.06);
  color: rgba(255, 250, 240, 1);
}
.theater-share-item--copy {
  border-top: 1px solid rgba(255, 255, 255, 0.07);
  margin-top: 2px;
  color: rgba(209, 184, 122, 0.7);
}
.theater-share-item--copy:hover {
  color: rgba(209, 184, 122, 1);
  background: rgba(209, 184, 122, 0.06);
}

/* ══════════════════════════════════════════════════════════
   Favorites Panel
   ══════════════════════════════════════════════════════════ */
.theater-fav-panel {
  position: absolute;
  top: 0;
  right: 0;
  bottom: 0;
  width: 300px;
  z-index: 28;
  display: flex;
  flex-direction: column;
  background: rgba(4, 4, 3, 0.9);
  backdrop-filter: blur(12px);
  border-left: 1px solid rgba(209, 184, 122, 0.15);
  transform: translateX(100%);
  transition: transform 0.35s cubic-bezier(0.25, 0.46, 0.45, 0.94);
}
.theater-fav-panel[hidden] {
  display: flex !important;   /* hidden でも transform アニメを使う */
  visibility: hidden;
  pointer-events: none;
}
.theater-fav-panel.is-open {
  transform: translateX(0);
  visibility: visible;
  pointer-events: auto;
}

/* ── ヘッダー ─────────────────────────────────────────── */
.theater-fav-panel__header {
  display: flex;
  align-items: center;
  padding: 1.1rem 1.2rem 0.9rem;
  border-bottom: 1px solid rgba(255, 255, 255, 0.07);
  gap: 0.6rem;
  flex-shrink: 0;
}

.theater-fav-panel__title {
  font-family: var(--font-serif-jp, serif);
  font-size: 0.82rem;
  letter-spacing: 0.3em;
  color: rgba(209, 184, 122, 0.8);
  margin: 0;
  flex: 1;
}

.theater-fav-panel__count {
  font-family: var(--font-display, sans-serif);
  font-size: 0.7rem;
  color: rgba(255, 255, 255, 0.3);
  letter-spacing: 0.05em;
}

.theater-fav-panel__close {
  background: transparent;
  border: none;
  color: rgba(255, 255, 255, 0.35);
  cursor: pointer;
  padding: 4px;
  display: flex;
  align-items: center;
  transition: color 0.2s;
  flex-shrink: 0;
}
.theater-fav-panel__close:hover { color: rgba(255, 255, 255, 0.8); }

/* ── リスト ───────────────────────────────────────────── */
.theater-fav-panel__list {
  list-style: none;
  margin: 0;
  padding: 0.4rem 0;
  overflow-y: auto;
  flex: 1;
  scrollbar-width: thin;
  scrollbar-color: rgba(209, 184, 122, 0.2) transparent;
}
.theater-fav-panel__list::-webkit-scrollbar { width: 4px; }
.theater-fav-panel__list::-webkit-scrollbar-track { background: transparent; }
.theater-fav-panel__list::-webkit-scrollbar-thumb { background: rgba(209, 184, 122, 0.2); border-radius: 2px; }

.theater-fav-panel__hint {
  font-family: var(--font-display, sans-serif);
  font-size: 0.65rem;
  letter-spacing: 0.1em;
  color: rgba(255, 255, 255, 0.2);
  padding: 0.45rem 1.2rem 0.35rem;
  margin: 0;
  border-bottom: 1px solid rgba(255, 255, 255, 0.04);
  flex-shrink: 0;
}

.theater-fav-panel__empty {
  padding: 2rem 1.2rem;
  font-family: var(--font-serif-jp, serif);
  font-size: 0.8rem;
  color: rgba(255, 255, 255, 0.3);
  text-align: center;
  letter-spacing: 0.1em;
}

/* ── 各アイテム ───────────────────────────────────────── */
.theater-fav-item {
  display: flex;
  align-items: center;
  gap: 0;
  padding: 0;
  cursor: default;
  transition: background 0.15s;
  border-bottom: 1px solid rgba(255, 255, 255, 0.04);
  user-select: none;
}
.theater-fav-item:hover {
  background: rgba(255, 255, 255, 0.03);
}
.theater-fav-item.is-playing {
  background: rgba(209, 184, 122, 0.05);
}
.theater-fav-item.is-dragging {
  opacity: 0.4;
}
.theater-fav-item.drag-over {
  border-top: 2px solid rgba(209, 184, 122, 0.5);
}

.theater-fav-item__drag {
  flex-shrink: 0;
  width: 28px;
  text-align: center;
  color: rgba(255, 255, 255, 0.18);
  font-size: 0.85rem;
  cursor: grab;
  padding: 0.7rem 0;
  line-height: 1;
}
.theater-fav-item__drag:active { cursor: grabbing; }

.theater-fav-item__index {
  flex-shrink: 0;
  width: 20px;
  font-family: var(--font-display, sans-serif);
  font-size: 0.62rem;
  color: rgba(255, 255, 255, 0.2);
  letter-spacing: 0;
  text-align: right;
}

.theater-fav-item__name {
  flex: 1;
  font-family: var(--font-serif-jp, serif);
  font-size: 0.8rem;
  letter-spacing: 0.06em;
  color: rgba(255, 250, 240, 0.7);
  padding: 0.7rem 0.5rem 0.7rem 0.6rem;
  cursor: pointer;
  transition: color 0.2s;
  line-height: 1.4;
  min-width: 0;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}
.theater-fav-item__name:hover { color: rgba(255, 250, 240, 1); }
.theater-fav-item.is-playing .theater-fav-item__name {
  color: rgba(209, 184, 122, 0.95);
}

.theater-fav-item__playing {
  flex-shrink: 0;
  font-size: 0.55rem;
  color: rgba(209, 184, 122, 0.8);
  padding-right: 0.3rem;
  animation: fp-playing-pulse 1.4s ease-in-out infinite;
}
@keyframes fp-playing-pulse {
  0%, 100% { opacity: 0.5; }
  50% { opacity: 1; }
}

.theater-fav-item__remove {
  flex-shrink: 0;
  background: transparent;
  border: none;
  color: rgba(209, 184, 122, 0.3);
  cursor: pointer;
  padding: 0.7rem 0.75rem;
  font-size: 0.8rem;
  line-height: 1;
  transition: color 0.2s, transform 0.2s;
}
.theater-fav-item__remove:hover {
  color: rgba(220, 80, 80, 0.8);
  transform: scale(1.2);
}

/* ── フッター ─────────────────────────────────────────── */
.theater-fav-panel__footer {
  padding: 0.9rem 1.2rem;
  border-top: 1px solid rgba(255, 255, 255, 0.07);
  flex-shrink: 0;
}

.theater-fav-panel__play-all {
  width: 100%;
  background: rgba(209, 184, 122, 0.08);
  border: 1px solid rgba(209, 184, 122, 0.3);
  border-radius: 1px;
  color: rgba(209, 184, 122, 0.8);
  font-family: var(--font-serif-jp, serif);
  font-size: 0.78rem;
  letter-spacing: 0.2em;
  padding: 0.55rem;
  cursor: pointer;
  transition: all 0.3s;
}
.theater-fav-panel__play-all:hover {
  background: rgba(209, 184, 122, 0.15);
  border-color: rgba(209, 184, 122, 0.6);
  color: rgba(209, 184, 122, 1);
}

/* ── モバイル ─────────────────────────────────────────── */
@media (max-width: 768px) {
  .theater-fav-panel {
    width: 100%;
    top: auto;
    height: 65%;
    transform: translateY(100%);
    border-left: none;
    border-top: 1px solid rgba(209, 184, 122, 0.15);
  }
  .theater-fav-panel.is-open {
    transform: translateY(0);
  }
}