/* ==========================================================================
   SWARU Official Website - Design System & Stylesheet
   Theme: Midnight Urban Neon (深夜のシティドライブとネオンライト)
   ========================================================================== */

/* 1. Design Tokens & Variables */
:root {
  --font-sans: 'Smooch Sans', 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  --font-serif: 'Oranienbaum', 'Georgia', 'Cinzel', serif;
  --font-digital: 'Orbitron', monospace;

  /* Colors */
  --color-bg: #07080c;
  --color-text-main: #f3f4f6;
  --color-text-muted: #9ca3af;
  
  /* Neons */
  --neon-cyan: #00ffff;
  --neon-pink: #ff6eb4;
  --neon-gold: #d4af6a;
  --neon-silver: #c0c0c0;
  
  --shadow-neon-cyan: 0 0 10px rgba(0, 255, 255, 0.4), 0 0 30px rgba(0, 255, 255, 0.2);
  --shadow-neon-pink: 0 0 10px rgba(255, 110, 180, 0.4), 0 0 30px rgba(255, 110, 180, 0.2);
  --shadow-neon-gold: 0 0 10px rgba(212, 175, 106, 0.4), 0 0 30px rgba(212, 175, 106, 0.2);
  
  /* Glassmorphism */
  --glass-bg: rgba(10, 11, 16, 0.65);
  --glass-border: rgba(255, 255, 255, 0.08);
  --glass-blur: blur(20px);
}

/* Reset */
* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
  font-size: 16px;
}

body {
  background-color: var(--color-bg);
  color: var(--color-text-main);
  font-family: var(--font-sans);
  overflow-x: hidden;
  line-height: 1.6;
}

/* Scrollbar Style */
::-webkit-scrollbar {
  width: 6px;
  height: 6px;
}
::-webkit-scrollbar-track {
  background: var(--color-bg);
}
::-webkit-scrollbar-thumb {
  background: rgba(255, 255, 255, 0.15);
  border-radius: 3px;
}
::-webkit-scrollbar-thumb:hover {
  background: var(--neon-cyan);
  box-shadow: var(--shadow-neon-cyan);
}

/* ==========================================================================
   2. Layout & Video Background (フルスクリーン背景)
   ========================================================================== */
.video-bg-container {
  position: fixed;
  top: 0;
  left: 0;
  width: 100vw;
  height: 100vh;
  z-index: -10;
  overflow: hidden;
  background-color: #000;
  /* スマホで動画が読み込めない場合のフォールバック背景画像 */
  background-image: url('material/image/tokyo_night_back.jpg');
  background-size: cover;
  background-position: center;
}

.video-bg-container video {
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: 0.45; /* ビデオがうるさくなりすぎないように透過 */
  transition: opacity 1s ease;
}

#ambientCanvas {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  pointer-events: none;
  z-index: 1;
}

.video-overlay {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: linear-gradient(to bottom, 
    rgba(7, 8, 12, 0.3) 0%, 
    rgba(7, 8, 12, 0.6) 60%, 
    var(--color-bg) 100%
  );
  z-index: 2;
}

.app-layout {
  position: relative;
  z-index: 10;
  width: 100%;
}

/* ==========================================================================
   3. Header & Navigation
   ========================================================================== */
.site-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 24px 60px;
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  z-index: 100;
  background: linear-gradient(to bottom, rgba(7, 8, 12, 0.9) 0%, rgba(7, 8, 12, 0) 100%);
  backdrop-filter: blur(4px);
}

.header-logo {
  height: 38px;
  display: block;
}

.site-nav {
  display: flex;
  gap: 40px;
}

.site-nav a {
  font-family: 'Smooch Sans', sans-serif;
  color: var(--color-text-muted);
  text-decoration: none;
  font-weight: 600;
  font-size: 1.25rem;
  letter-spacing: 0.12em;
  transition: color 0.3s, text-shadow 0.3s;
}

.site-nav a:hover {
  color: var(--color-text-main);
  text-shadow: 0 0 10px rgba(255,255,255,0.5);
}

.produced-by {
  color: var(--color-text-muted);
  font-size: 0.75rem;
  letter-spacing: 0.2em;
  font-weight: 300;
}

/* ==========================================================================
   4. Hero Section
   ========================================================================== */
.hero-section {
  height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 0 60px;
}

.hero-content {
  text-align: center;
  max-width: 900px;
  animation: fadeIn 1.5s ease-out;
}

.album-title {
  position: relative;
  display: inline-flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  margin-bottom: 45px; /* 下のシアン文字との間隔を適正化 */
  margin-top: 0px;
}

.title-neon {
  font-family: 'Roboto Flex', sans-serif;
  font-weight: 400;
  font-size: 6.5rem;
  color: #ffff4d; /* 鮮やかなイエロー */
  letter-spacing: 0.06em;
  line-height: 0.9;
  display: block;
  transform: scaleY(1.1); /* 縦長感 */
  text-shadow: 0 0 25px rgba(255, 255, 77, 0.4);
}

.title-afterglow {
  font-family: 'Tangerine', cursive;
  font-weight: 700;
  font-size: 9.5rem;
  color: #ff3377; /* 鮮やかなネオンピンク */
  display: block;
  transform: rotate(-11deg) translate(45px, 5px); /* あと20pt(px)下方へ修正 (-15px + 20px = 5px) */
  line-height: 0.5;
  filter: drop-shadow(6px 8px 7px rgba(0, 0, 0, 0.95)) drop-shadow(0 0 25px rgba(255, 51, 119, 0.6));
  z-index: 2;
  white-space: nowrap;
}

.hero-subtitle {
  color: var(--neon-cyan);
  font-family: var(--font-sans);
  font-weight: 600;
  font-size: 0.95rem;
  letter-spacing: 0.3em;
  text-transform: uppercase;
  margin-bottom: 30px;
  text-shadow: var(--shadow-neon-cyan);
}

/* Countdown UI */
.countdown-container {
  background: var(--glass-bg);
  border: 1px solid var(--glass-border);
  backdrop-filter: var(--glass-blur);
  padding: 20px 45px;
  border-radius: 16px;
  display: inline-block;
  box-shadow: 0 20px 40px rgba(0,0,0,0.4);
}

.countdown-label {
  color: var(--color-text-muted);
  font-size: 0.75rem;
  letter-spacing: 0.25em;
  text-transform: uppercase;
  margin-bottom: 20px;
}

.timer {
  display: flex;
  gap: 36px;
  justify-content: center;
}

.timer-segment {
  display: flex;
  flex-direction: column;
  align-items: center;
}

.timer-segment .number {
  font-family: var(--font-digital);
  font-size: 3.5rem;
  font-weight: 700;
  color: var(--color-text-main);
  text-shadow: 0 0 15px rgba(255,255,255,0.4);
  line-height: 1;
}

.timer-segment .unit {
  font-size: 0.65rem;
  letter-spacing: 0.15em;
  color: var(--color-text-muted);
  margin-top: 8px;
}

.scroll-indicator {
  position: absolute;
  bottom: 40px;
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
  color: var(--color-text-muted);
  font-size: 0.7rem;
  letter-spacing: 0.25em;
}

.bounce-icon {
  animation: bounce 2s infinite;
}

/* ==========================================================================
   5. Tracklist Section (アコーディオン・スライダー)
   ========================================================================== */
.tracklist-section {
  padding: 100px 60px;
  background-color: var(--color-bg);
  min-height: 100vh;
  display: flex;
  align-items: center;
}

.section-container {
  display: flex;
  width: 100%;
  max-width: 1440px;
  margin: 0 auto;
  gap: 40px;
}

.section-left {
  flex: 1;
  max-width: 320px;
  display: flex;
  flex-direction: column;
  justify-content: center;
}

.section-title {
  font-family: 'Oranienbaum', serif;
  font-size: 3.2rem;
  font-weight: 400;
  letter-spacing: 0.08em;
  color: var(--neon-gold);
  margin-bottom: 24px;
  text-shadow: var(--shadow-neon-gold);
}

.section-desc-en {
  color: var(--color-text-main);
  font-size: 0.95rem;
  margin-bottom: 12px;
  line-height: 1.6;
}

.section-desc-ja {
  color: var(--color-text-muted);
  font-size: 0.85rem;
  line-height: 1.7;
  margin-bottom: 40px;
}

.track-navigation {
  display: flex;
  gap: 16px;
}

.btn-nav {
  background: var(--glass-bg);
  border: 1px solid var(--glass-border);
  color: var(--color-text-main);
  width: 48px;
  height: 48px;
  border-radius: 50%;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all 0.3s;
}

.btn-nav:hover {
  background: var(--color-text-main);
  color: var(--color-bg);
  box-shadow: 0 0 15px rgba(255,255,255,0.3);
  transform: scale(1.05);
}

/* Accordion Container */
.section-right {
  flex: 3;
}

.accordion-container {
  display: flex;
  width: 100%;
  height: 520px;
  gap: 10px;
  overflow: hidden;
  border-radius: 16px;
  border: 1px solid var(--glass-border);
  background-color: rgba(0,0,0,0.5);
}

.accordion-item {
  flex: 1;
  min-width: 50px;
  height: 100%;
  position: relative;
  overflow: hidden;
  cursor: pointer;
  background-size: cover;
  background-position: center;
  background-repeat: no-repeat;
  border-right: 1px solid rgba(255,255,255,0.05);
  transition: flex 0.7s cubic-bezier(0.25, 1, 0.4, 1);
}

/* 暗いフィルター効果 */
.accordion-item::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: linear-gradient(to right, rgba(0, 0, 0, 0.9) 0%, rgba(0, 0, 0, 0.7) 100%);
  transition: background 0.7s;
  z-index: 1;
}

.accordion-item.active {
  flex: 14;
  cursor: default;
  border-right: none;
}

.accordion-item.active::before {
  background: linear-gradient(to right, rgba(7, 8, 12, 0.95) 0%, rgba(7, 8, 12, 0.75) 45%, rgba(7, 8, 12, 0.2) 100%);
}

/* 非アクティブ時の縦書きのタブ部分 */
.accordion-tab {
  position: absolute;
  top: 0;
  left: 0;
  width: 50px;
  height: 100%;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: flex-start;
  padding-top: 30px;
  z-index: 5;
  pointer-events: none;
  transition: opacity 0.4s;
}

.accordion-item.active .accordion-tab {
  opacity: 0;
}

.track-num {
  font-family: var(--font-digital);
  font-size: 1.1rem;
  color: var(--neon-cyan);
  margin-bottom: 24px;
}

.track-tab-title {
  writing-mode: vertical-rl;
  text-orientation: mixed;
  color: var(--color-text-muted);
  font-size: 0.75rem;
  letter-spacing: 0.2em;
  white-space: nowrap;
  font-weight: 600;
  text-transform: uppercase;
}

.accordion-item:hover .track-tab-title {
  color: var(--color-text-main);
  text-shadow: 0 0 8px rgba(255,255,255,0.4);
}

/* アクティブ時のスライド詳細パネル */
.accordion-panel {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  padding: 40px;
  z-index: 3;
  opacity: 0;
  visibility: hidden;
  transition: opacity 0.5s ease 0.3s, visibility 0.5s ease 0.3s;
  overflow: hidden;
}

.accordion-item.active .accordion-panel {
  opacity: 1;
  visibility: visible;
}

.panel-content {
  max-width: 500px;
  height: 100%;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
}

.panel-header {
  margin-bottom: 20px;
}

.panel-track-num {
  font-size: 0.7rem;
  color: var(--neon-pink);
  font-weight: 700;
  letter-spacing: 0.25em;
  display: block;
  margin-bottom: 8px;
}

.panel-title-en {
  font-family: var(--font-sans);
  font-size: 1.8rem;
  font-weight: 700;
  letter-spacing: -0.01em;
  color: var(--color-text-main);
}

.panel-title-ja {
  font-family: var(--font-serif);
  font-size: 1.1rem;
  color: var(--neon-gold);
  margin-top: 4px;
}

.panel-time {
  font-size: 0.7rem;
  color: var(--color-text-muted);
  letter-spacing: 0.1em;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  margin-top: 8px;
  background: rgba(255,255,255,0.05);
  padding: 4px 10px;
  border-radius: 12px;
}

.panel-desc {
  font-size: 0.85rem;
  color: var(--color-text-muted);
  line-height: 1.7;
  margin-bottom: 20px;
}

.panel-lyrics {
  flex-grow: 1;
  overflow: hidden;
  display: flex;
  flex-direction: column;
}

.panel-lyrics h5 {
  font-size: 0.7rem;
  letter-spacing: 0.2em;
  color: var(--color-text-muted);
  margin-bottom: 10px;
}

.lyrics-text {
  font-family: var(--font-serif);
  font-size: 0.85rem;
  color: var(--color-text-main);
  line-height: 1.8;
  overflow-y: auto;
  padding-right: 10px;
  mask-image: linear-gradient(to bottom, black 80%, transparent 100%);
  -webkit-mask-image: linear-gradient(to bottom, black 80%, transparent 100%);
}

/* ==========================================================================
   6. Worldview / Concept Section
   ========================================================================== */
.worldview-section {
  position: relative;
  padding: 120px 60px;
  overflow: hidden;
  background-color: #07080b;
}

.worldview-bg {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background-image: url('material/image/captured/scene05_ready.png');
  background-size: cover;
  background-position: center;
  opacity: 0.15;
  filter: blur(10px);
  z-index: 1;
}

.worldview-content {
  position: relative;
  z-index: 5;
  max-width: 800px;
  margin: 0 auto;
}

.concept-text {
  text-align: center;
  background: var(--glass-bg);
  border: 1px solid var(--glass-border);
  backdrop-filter: var(--glass-blur);
  padding: 60px 50px;
  border-radius: 20px;
  box-shadow: 0 30px 60px rgba(0,0,0,0.5);
}

.en-lead {
  font-family: var(--font-serif);
  font-size: 1.6rem;
  font-style: italic;
  line-height: 1.6;
  color: var(--color-text-main);
  margin-bottom: 24px;
}

.divider-neon {
  width: 80px;
  height: 2px;
  background: linear-gradient(to right, var(--neon-cyan), var(--neon-pink));
  margin: 0 auto 30px;
  box-shadow: var(--shadow-neon-cyan);
}

.ja-body {
  font-size: 0.95rem;
  line-height: 2.0;
  color: var(--color-text-muted);
}

.text-center {
  text-align: center;
}

/* ==========================================================================
   7. Schedule / Timeline Section
   ========================================================================== */
.schedule-section {
  padding: 120px 60px;
  background-color: var(--color-bg);
}

.schedule-intro {
  color: var(--color-text-muted);
  font-size: 0.9rem;
  letter-spacing: 0.15em;
  margin-top: -10px;
  margin-bottom: 60px;
}

.timeline {
  max-width: 800px;
  margin: 0 auto;
  position: relative;
}

/* タイムラインの縦線 */
.timeline::before {
  content: '';
  position: absolute;
  top: 0;
  left: 120px;
  width: 1px;
  height: 100%;
  background: linear-gradient(to bottom, 
    var(--neon-pink) 0%, 
    var(--neon-cyan) 60%, 
    rgba(255,255,255,0.05) 100%
  );
}

.timeline-item {
  display: flex;
  margin-bottom: 50px;
  position: relative;
}

.timeline-date {
  width: 100px;
  font-family: var(--font-digital);
  font-size: 0.95rem;
  color: var(--color-text-muted);
  text-align: right;
  padding-top: 4px;
}

.timeline-dot {
  width: 11px;
  height: 11px;
  border-radius: 50%;
  background-color: var(--color-bg);
  border: 2px solid var(--color-text-muted);
  position: absolute;
  left: 115px;
  top: 8px;
  z-index: 10;
  transition: all 0.3s;
}

.timeline-item:hover .timeline-dot {
  border-color: var(--neon-cyan);
  background-color: var(--neon-cyan);
  box-shadow: var(--shadow-neon-cyan);
  transform: scale(1.3);
}

.timeline-content {
  margin-left: 50px;
  background: var(--glass-bg);
  border: 1px solid var(--glass-border);
  padding: 24px 30px;
  border-radius: 12px;
  flex-grow: 1;
  transition: border-color 0.3s;
}

.timeline-item:hover .timeline-content {
  border-color: rgba(0, 255, 255, 0.2);
}

.timeline-content h4 {
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--color-text-main);
  margin-bottom: 8px;
}

.timeline-content p {
  font-size: 0.85rem;
  color: var(--color-text-muted);
}

/* Highlighted D-day Card */
.timeline-item.highlighted .timeline-dot {
  border-color: var(--neon-pink);
  background-color: var(--neon-pink);
  box-shadow: var(--shadow-neon-pink);
}

.timeline-item.highlighted .timeline-date {
  color: var(--neon-pink);
  text-shadow: var(--shadow-neon-pink);
}

.timeline-item.highlighted .timeline-content {
  border: 1px solid rgba(255, 110, 180, 0.3);
  box-shadow: 0 0 20px rgba(255, 110, 180, 0.08);
}

.timeline-item.highlighted .timeline-content h4 {
  color: var(--neon-pink);
  text-shadow: var(--shadow-neon-pink);
}

/* ==========================================================================
   8. Footer
   ========================================================================== */
.site-footer {
  padding: 60px 60px 140px; /* プレイヤーの高さ分をあける */
  border-top: 1px solid rgba(255,255,255,0.05);
  text-align: center;
  background-color: var(--color-bg);
}

.footer-links {
  display: flex;
  justify-content: center;
  gap: 30px;
  margin-bottom: 24px;
}

.footer-links a {
  color: var(--color-text-muted);
  font-size: 1.5rem;
  transition: color 0.3s, transform 0.3s;
  text-decoration: none;
}

.footer-links a:hover {
  color: var(--color-text-main);
  transform: translateY(-3px);
}

.custom-icon-tiktok {
  font-size: 1.3rem;
  display: inline-block;
  line-height: 1;
}

.copyright {
  color: rgba(255,255,255,0.25);
  font-size: 0.75rem;
  letter-spacing: 0.1em;
}

/* ==========================================================================
   9. Floating Music Player Bar (下部常駐音楽プレイヤー)
   ========================================================================== */
.music-player-bar {
  position: fixed;
  bottom: 0;
  left: 0;
  width: 100%;
  height: 80px;
  background: rgba(10, 11, 16, 0.85);
  backdrop-filter: blur(15px);
  -webkit-backdrop-filter: blur(15px);
  border-top: 1px solid rgba(255,255,255,0.08);
  z-index: 1000;
  display: flex;
  align-items: center;
}

.player-bar-container {
  display: flex;
  width: 100%;
  max-width: 1440px;
  margin: 0 auto;
  padding: 0 40px;
  justify-content: space-between;
  align-items: center;
}

.player-track-info {
  display: flex;
  align-items: center;
  gap: 12px;
  width: 250px;
}

.player-cover {
  width: 48px;
  height: 48px;
  border-radius: 6px;
  object-fit: cover;
  border: 1px solid rgba(255,255,255,0.1);
  box-shadow: 0 4px 10px rgba(0,0,0,0.3);
}

.player-text {
  display: flex;
  flex-direction: column;
}

.player-title {
  font-size: 0.85rem;
  font-weight: 700;
  color: var(--color-text-main);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.player-artist {
  font-size: 0.75rem;
  color: var(--color-text-muted);
}

/* Center Controls */
.player-controls-center {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 6px;
  flex-grow: 1;
  max-width: 500px;
}

.player-btn {
  background: var(--neon-cyan);
  border: none;
  color: var(--color-bg);
  width: 36px;
  height: 36px;
  border-radius: 50%;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all 0.3s;
  box-shadow: var(--shadow-neon-cyan);
}

.player-btn:hover {
  transform: scale(1.1);
  box-shadow: 0 0 15px rgba(0, 255, 255, 0.7);
}

.player-progress-area {
  display: flex;
  width: 100%;
  align-items: center;
  gap: 12px;
}

.player-progress-area span {
  font-size: 0.7rem;
  color: var(--color-text-muted);
  font-family: var(--font-digital);
}

.player-progress-bar-wrap {
  flex-grow: 1;
  display: flex;
  align-items: center;
}

.player-progress-bar-wrap input[type="range"] {
  width: 100%;
  -webkit-appearance: none;
  background: rgba(255, 255, 255, 0.1);
  height: 3px;
  border-radius: 2px;
  outline: none;
  cursor: pointer;
}

.player-progress-bar-wrap input[type="range"]::-webkit-slider-thumb {
  -webkit-appearance: none;
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--neon-cyan);
  box-shadow: var(--shadow-neon-cyan);
  transition: transform 0.1s;
}

.player-progress-bar-wrap input[type="range"]::-webkit-slider-thumb:hover {
  transform: scale(1.3);
}

/* Right Controls (ビジュアライザー等) */
.player-controls-right {
  display: flex;
  align-items: center;
  gap: 20px;
  width: 250px;
  justify-content: flex-end;
}

.player-btn-small {
  background: transparent;
  border: none;
  color: var(--color-text-muted);
  cursor: pointer;
  transition: color 0.3s;
}

.player-btn-small:hover {
  color: var(--color-text-main);
}

/* Mini Equalizer animation */
.mini-equalizer {
  display: flex;
  align-items: flex-end;
  gap: 3px;
  height: 18px;
  width: 30px;
}

.eq-bar {
  width: 3px;
  height: 3px;
  background-color: var(--neon-pink);
  box-shadow: var(--shadow-neon-pink);
  border-radius: 1px;
}

.music-player-bar.playing .eq-bar {
  animation: eqBounce 1.2s ease-in-out infinite alternate;
}

.music-player-bar.playing .eq-bar:nth-child(1) { animation-delay: 0.1s; animation-duration: 0.8s; }
.music-player-bar.playing .eq-bar:nth-child(2) { animation-delay: 0.4s; animation-duration: 1.2s; }
.music-player-bar.playing .eq-bar:nth-child(3) { animation-delay: 0.2s; animation-duration: 0.9s; }
.music-player-bar.playing .eq-bar:nth-child(4) { animation-delay: 0.6s; animation-duration: 1.1s; }
.music-player-bar.playing .eq-bar:nth-child(5) { animation-delay: 0.3s; animation-duration: 0.7s; }

/* ==========================================================================
   10. Keyframes & Animations
   ========================================================================== */
@keyframes fadeIn {
  from { opacity: 0; transform: translateY(20px); }
  to { opacity: 1; transform: translateY(0); }
}

@keyframes bounce {
  0%, 20%, 50%, 80%, 100% { transform: translateY(0) translateX(-50%); }
  40% { transform: translateY(-10px) translateX(-50%); }
  60% { transform: translateY(-5px) translateX(-50%); }
}

@keyframes eqBounce {
  0% { height: 3px; }
  100% { height: 18px; }
}

/* ==========================================================================
   11. Responsive Design (レスポンシブ設計)
   ========================================================================== */
@media (max-width: 1024px) {
  .section-container {
    flex-direction: column;
  }
  .section-left {
    max-width: 100%;
    margin-bottom: 20px;
  }
  .site-header {
    padding: 20px 30px;
  }
  .site-nav {
    display: none; /* スマホではナビゲーションを省略するかハンバーガー化 */
  }
  .album-title {
    margin-bottom: 45px;
  }
  .title-neon {
    font-size: 4.5rem;
  }
  .title-afterglow {
    font-size: 6.8rem;
    transform: rotate(-11deg) translate(25px, 5px);
    line-height: 0.5;
  }
}

@media (max-width: 768px) {
  .album-title {
    margin-bottom: 35px;
  }
  .title-neon {
    font-size: 3.5rem;
  }
  .title-afterglow {
    font-size: 5.2rem;
    transform: rotate(-10deg) translate(15px, 2px);
    line-height: 0.5;
  }
  .timer {
    gap: 20px;
  }
  .timer-segment .number {
    font-size: 2.2rem;
  }
  .tracklist-section {
    padding: 60px 20px;
  }
  .accordion-container {
    flex-direction: column; /* スマホサイズでは縦アコーディオン化 */
    height: auto;
  }
  .accordion-item {
    width: 100%;
    height: 60px;
    min-height: 60px;
    border-right: none;
    border-bottom: 1px solid rgba(255,255,255,0.05);
    transition: height 0.7s cubic-bezier(0.25, 1, 0.4, 1);
  }
  .accordion-item.active {
    flex: none;
    height: 380px;
  }
  .accordion-tab {
    width: 100%;
    height: 60px;
    flex-direction: row;
    align-items: center;
    padding-top: 0;
    padding-left: 20px;
  }
  .track-num {
    margin-bottom: 0;
    margin-right: 15px;
  }
  .track-tab-title {
    writing-mode: horizontal-tb;
  }
  .accordion-panel {
    padding: 80px 20px 20px; /* タブと重ならないよう上パディングを確保 */
  }
  .player-progress-area {
    display: none; /* スマホでは進捗バーを隠してシンプルに */
  }
  .player-track-info {
    width: 160px;
  }
  .player-controls-right {
    width: auto;
  }
}

/* ==========================================================================
   12. Bilingual / Language Switcher Styles
   ========================================================================== */
body.lang-ja .lang-en {
  display: none !important;
}

body.lang-en .lang-ja {
  display: none !important;
}

.lang-switcher {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-right: 30px;
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid rgba(255, 255, 255, 0.08);
  padding: 4px 12px;
  border-radius: 20px;
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
}

.btn-lang {
  background: transparent;
  border: none;
  color: var(--color-text-muted);
  font-family: 'Smooch Sans', sans-serif;
  font-size: 1.15rem;
  font-weight: 700;
  cursor: pointer;
  transition: all 0.3s;
  letter-spacing: 0.08em;
}

.btn-lang.active {
  color: var(--neon-cyan);
  text-shadow: var(--shadow-neon-cyan);
}

.btn-lang:hover:not(.active) {
  color: var(--color-text-main);
  text-shadow: 0 0 8px rgba(255, 255, 255, 0.3);
}

.lang-separator {
  color: rgba(255, 255, 255, 0.15);
  font-size: 0.75rem;
  pointer-events: none;
}

.badge-preview {
  background: rgba(255, 75, 125, 0.2);
  color: var(--neon-pink);
  border: 1px solid rgba(255, 75, 125, 0.4);
  font-size: 0.65rem;
  padding: 2px 6px;
  border-radius: 4px;
  margin-left: 6px;
  font-weight: 700;
  letter-spacing: 0.05em;
  display: inline-block;
  vertical-align: middle;
}

/* 7/10 Worldwide Streaming Notice Badge */
.streaming-notice-badge {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 25px;
  padding: 8px 22px;
  background: rgba(0, 255, 255, 0.06);
  border: 1px solid rgba(0, 255, 255, 0.25);
  border-radius: 30px;
  color: var(--neon-cyan);
  font-size: 0.85rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  backdrop-filter: blur(8px);
  box-shadow: 0 0 15px rgba(0, 255, 255, 0.15);
}

.pulse-icon {
  animation: pulseGlow 2s infinite ease-in-out;
}

@keyframes pulseGlow {
  0%, 100% { opacity: 0.6; transform: scale(1); }
  50% { opacity: 1; transform: scale(1.15); }
}

/* Footer 3id Logo */
.footer-brand {
  margin-bottom: 15px;
}

.footer-3id-logo {
  height: 28px;
  width: auto;
  opacity: 0.85;
  transition: opacity 0.3s, transform 0.3s;
  filter: drop-shadow(0 0 8px rgba(255, 255, 255, 0.2));
}

.footer-3id-logo:hover {
  opacity: 1;
  transform: scale(1.05);
}

/* HyperFollow プリセーブボタン */
.presave-container {
  margin-top: 22px;
  display: flex;
  justify-content: center;
  z-index: 10;
}

.btn-presave {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 8px 20px;
  background: linear-gradient(135deg, rgba(255, 51, 119, 0.85) 0%, rgba(160, 32, 240, 0.85) 100%);
  color: #ffffff;
  border-radius: 50px;
  font-family: 'Smooch Sans', sans-serif;
  font-weight: 700;
  font-size: 0.85rem;
  letter-spacing: 0.08em;
  text-decoration: none;
  box-shadow: 0 0 20px rgba(255, 51, 119, 0.4), inset 0 1px 1px rgba(255, 255, 255, 0.4);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  transition: all 0.35s cubic-bezier(0.25, 1, 0.4, 1);
  border: 1px solid rgba(255, 255, 255, 0.2);
}

.btn-presave:hover {
  transform: translateY(-2px) scale(1.03);
  background: linear-gradient(135deg, rgba(255, 75, 135, 1) 0%, rgba(180, 50, 255, 1) 100%);
  box-shadow: 0 0 30px rgba(255, 51, 119, 0.7), 0 8px 16px rgba(0, 0, 0, 0.4);
  color: #ffffff;
}

.icon-presave {
  width: 16px;
  height: 16px;
}