/* ===========================
   リセット & ベース
=========================== */
*,
*::before,
*::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

:root {
  --color-bg: #0d0d0d;
  --color-surface: #1a1a1a;
  --color-accent: #e8c84a;
  --color-accent2: #ff6b35;
  --color-text: #f0f0f0;
  --color-text-muted: #888;
  --color-chapter-bg: #111;
  --max-width: 680px;
  --font-serif: 'Noto Serif JP', serif;
  --font-sans: 'Noto Sans JP', sans-serif;
}

html {
  scroll-behavior: smooth;
}

body {
  background-color: #050505;
  background-image:
    radial-gradient(ellipse at 20% 30%, rgba(232, 200, 74, 0.03) 0%, transparent 50%),
    radial-gradient(ellipse at 80% 70%, rgba(255, 107, 53, 0.02) 0%, transparent 50%);
  color: var(--color-text);
  font-family: var(--font-sans);
  overflow-x: hidden;
}

/* ===========================
   プログレスバー
=========================== */
#progress-bar-container {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 4px;
  background: rgba(255, 255, 255, 0.1);
  z-index: 1000;
  display: flex;
  align-items: center;
}

#progress-bar {
  height: 100%;
  background: linear-gradient(90deg, var(--color-accent), var(--color-accent2));
  width: 0%;
  transition: width 0.2s ease;
  box-shadow: 0 0 8px var(--color-accent);
}

#progress-label {
  position: fixed;
  top: 8px;
  right: 12px;
  font-size: 10px;
  color: var(--color-accent);
  font-family: var(--font-sans);
  font-weight: 700;
  letter-spacing: 0.05em;
  z-index: 1001;
  opacity: 0;
  transition: opacity 0.3s;
}

body.scrolled #progress-label {
  opacity: 1;
}

/* ===========================
   ヒーローセクション
=========================== */
#hero {
  position: relative;
  min-height: 100svh;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
  background: #000;
}

.hero-bg {
  position: absolute;
  inset: 0;
  background:
    radial-gradient(ellipse at 20% 50%, rgba(232, 200, 74, 0.08) 0%, transparent 60%),
    radial-gradient(ellipse at 80% 20%, rgba(255, 107, 53, 0.06) 0%, transparent 50%),
    linear-gradient(180deg, #000 0%, #0d0d0d 100%);
  z-index: 0;
}

/* 背景に漫画ページを薄く表示 */
.hero-bg::after {
  content: '';
  position: absolute;
  inset: 0;
  background: url('images/1.jpg') center top/cover no-repeat;
  opacity: 0.12;
  filter: blur(6px) saturate(0.5);
  z-index: 0;
  transform: scale(1.05);
}

.hero-content {
  position: relative;
  z-index: 1;
  text-align: center;
  padding: 40px 24px;
  max-width: var(--max-width);
  width: 100%;
  margin: 0 auto;
}

.hero-badge {
  display: inline-block;
  background: rgba(232, 200, 74, 0.15);
  border: 1px solid rgba(232, 200, 74, 0.4);
  color: var(--color-accent);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.1em;
  padding: 6px 16px;
  border-radius: 100px;
  margin-bottom: 32px;
  animation: fadeInDown 0.8s ease both;
}

.hero-title {
  font-family: var(--font-serif);
  font-weight: 900;
  line-height: 1.3;
  margin-bottom: 24px;
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.title-line1,
.title-line2,
.title-line3 {
  font-size: clamp(28px, 7vw, 48px);
  color: var(--color-text);
  display: block;
  animation: fadeInUp 0.8s ease both;
}

.title-line1 {
  animation-delay: 0.2s;
}

.title-line2 {
  animation-delay: 0.4s;
}

.title-line3 {
  animation-delay: 0.6s;
}

.title-line4 {
  font-size: clamp(20px, 5vw, 32px);
  color: var(--color-accent);
  display: block;
  animation: fadeInUp 0.8s ease 0.8s both;
}

.hero-sub {
  font-size: clamp(13px, 3.5vw, 16px);
  color: var(--color-text-muted);
  line-height: 1.8;
  margin-bottom: 48px;
  animation: fadeInUp 0.8s ease 1s both;
}

.hero-scroll-hint {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
  animation: fadeInUp 0.8s ease 1.2s both;
}

.hero-scroll-hint span {
  font-size: 12px;
  color: var(--color-text-muted);
  letter-spacing: 0.1em;
}

.scroll-arrow {
  width: 24px;
  height: 24px;
  border-right: 2px solid var(--color-accent);
  border-bottom: 2px solid var(--color-accent);
  transform: rotate(45deg);
  animation: bounce 1.5s ease infinite;
}

/* ===========================
   漫画ビューワー
=========================== */
#manga-viewer {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0;
  background: #111;
  box-shadow: 0 0 80px rgba(0, 0, 0, 0.8);
}

/* ===========================
   漫画ページ
=========================== */
.manga-page {
  position: relative;
  width: 100%;
  overflow: hidden;
  /* スクロールアニメーション用 */
  opacity: 0;
  transform: translateY(40px);
  transition: opacity 0.8s cubic-bezier(0.22, 1, 0.36, 1),
    transform 0.8s cubic-bezier(0.22, 1, 0.36, 1);
  will-change: opacity, transform;
}

.manga-page.visible {
  opacity: 1;
  transform: translateY(0);
}

.manga-page img {
  width: 100%;
  height: auto;
  display: block;
  border-bottom: 1px solid rgba(255, 255, 255, 0.04);
  transition: filter 0.3s ease;
}

.manga-page:hover img {
  filter: brightness(1.03);
}

/* ページ番号バッジ */
.manga-page::before {
  content: attr(data-page);
  position: absolute;
  top: 12px;
  right: 12px;
  background: rgba(0, 0, 0, 0.6);
  color: rgba(255, 255, 255, 0.4);
  font-size: 11px;
  font-weight: 700;
  padding: 3px 8px;
  border-radius: 100px;
  z-index: 2;
  font-family: var(--font-sans);
  letter-spacing: 0.05em;
}

/* ===========================
   チャプター区切り
=========================== */
.chapter-divider {
  width: 100%;
  padding: 48px 24px;
  background: var(--color-chapter-bg);
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
  overflow: hidden;
  opacity: 0;
  transform: scale(0.95);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

.chapter-divider.visible {
  opacity: 1;
  transform: scale(1);
}

.chapter-divider::before {
  content: '';
  position: absolute;
  inset: 0;
  background:
    radial-gradient(ellipse at 50% 50%, rgba(232, 200, 74, 0.06) 0%, transparent 70%);
}

.chapter-divider::after {
  content: '';
  position: absolute;
  left: 0;
  right: 0;
  top: 50%;
  height: 1px;
  background: linear-gradient(90deg, transparent, rgba(232, 200, 74, 0.3), transparent);
}

.chapter-inner {
  position: relative;
  z-index: 1;
  text-align: center;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.chapter-num {
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.2em;
  color: var(--color-accent);
  text-transform: uppercase;
  font-family: var(--font-sans);
}

.chapter-title {
  font-family: var(--font-serif);
  font-size: clamp(20px, 5vw, 28px);
  font-weight: 900;
  color: var(--color-text);
  letter-spacing: 0.05em;
}

/* ===========================
   エンディングセクション
=========================== */
#ending {
  background: linear-gradient(180deg, #111 0%, #0a0a0a 100%);
  padding: 80px 24px;
  text-align: center;
  width: 100%;
}

.ending-content {
  max-width: var(--max-width);
  margin: 0 auto;
}

.ending-badge {
  display: inline-block;
  background: rgba(255, 107, 53, 0.15);
  border: 1px solid rgba(255, 107, 53, 0.4);
  color: var(--color-accent2);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.1em;
  padding: 6px 16px;
  border-radius: 100px;
  margin-bottom: 32px;
}

.ending-title {
  font-family: var(--font-serif);
  font-size: clamp(32px, 8vw, 56px);
  font-weight: 900;
  line-height: 1.3;
  margin-bottom: 32px;
  color: var(--color-text);
}

.ending-title .highlight {
  color: var(--color-accent);
  position: relative;
}

.ending-title .highlight::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: var(--color-accent);
  border-radius: 2px;
}

.ending-body {
  font-size: clamp(14px, 3.5vw, 16px);
  line-height: 2;
  color: var(--color-text-muted);
}

/* ===========================
   CTAセクション
=========================== */
#cta {
  background: linear-gradient(180deg, #0a0a0a 0%, #111 100%);
  padding: 0 0 80px;
  width: 100%;
}

.cta-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 60px 24px;
  text-align: center;
  background: linear-gradient(135deg, rgba(232, 200, 74, 0.06) 0%, rgba(255, 107, 53, 0.04) 100%);
  border: 1px solid rgba(232, 200, 74, 0.15);
  border-radius: 16px;
  margin: 0 16px 80px;
  position: relative;
  overflow: hidden;
}

.cta-inner::before {
  content: '';
  position: absolute;
  top: -50%;
  left: -50%;
  width: 200%;
  height: 200%;
  background: radial-gradient(ellipse at 50% 0%, rgba(232, 200, 74, 0.05) 0%, transparent 60%);
  pointer-events: none;
}

.cta-label {
  font-size: 13px;
  color: var(--color-accent);
  font-weight: 700;
  letter-spacing: 0.1em;
  margin-bottom: 20px;
}

.cta-title {
  font-family: var(--font-serif);
  font-size: clamp(28px, 7vw, 44px);
  font-weight: 900;
  line-height: 1.4;
  margin-bottom: 24px;
  color: var(--color-text);
}

.cta-body {
  font-size: clamp(13px, 3.5vw, 15px);
  line-height: 2;
  color: var(--color-text-muted);
  margin-bottom: 32px;
}

.cta-features {
  display: flex;
  flex-direction: column;
  gap: 12px;
  margin-bottom: 40px;
  margin-top: 0;
  text-align: left;
  max-width: 320px;
  margin-left: auto;
  margin-right: auto;
}

.cta-feature {
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 14px;
  color: var(--color-text);
}

.feature-icon {
  width: 24px;
  height: 24px;
  background: var(--color-accent);
  color: #000;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 12px;
  font-weight: 900;
  flex-shrink: 0;
}

.cta-btn {
  display: inline-flex;
  flex-direction: column;
  align-items: center;
  gap: 6px;
  background: linear-gradient(135deg, var(--color-accent), #f0a030);
  color: #000;
  text-decoration: none;
  padding: 20px 48px;
  border-radius: 100px;
  font-weight: 900;
  transition: transform 0.2s ease, box-shadow 0.2s ease;
  box-shadow: 0 4px 24px rgba(232, 200, 74, 0.3);
  margin-bottom: 20px;
  animation: pulse 2s ease infinite;
}

.cta-btn:hover {
  transform: translateY(-2px) scale(1.02);
  box-shadow: 0 8px 32px rgba(232, 200, 74, 0.5);
  animation: none;
}

.cta-btn-main {
  font-size: clamp(16px, 4vw, 20px);
  letter-spacing: 0.05em;
}

.cta-btn-sub {
  font-size: 12px;
  font-weight: 700;
  opacity: 0.7;
}

.cta-note {
  font-size: 12px;
  color: var(--color-text-muted);
}

/* ===========================
   フローティングCTAボタン
=========================== */
#floating-cta {
  position: fixed;
  bottom: 24px;
  left: 50%;
  transform: translateX(-50%);
  z-index: 999;
  transition: opacity 0.4s ease, transform 0.4s ease;
  width: calc(100% - 48px);
  max-width: 400px;
}

#floating-cta.hidden {
  opacity: 0;
  transform: translateX(-50%) translateY(20px);
  pointer-events: none;
}

.floating-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  background: linear-gradient(135deg, var(--color-accent), #f0a030);
  color: #000;
  text-decoration: none;
  padding: 16px 24px;
  border-radius: 100px;
  font-size: 15px;
  font-weight: 900;
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.4), 0 0 0 0 rgba(232, 200, 74, 0.4);
  animation: floatPulse 2s ease infinite;
  letter-spacing: 0.05em;
}

.floating-btn .arrow {
  font-size: 18px;
}

/* ===========================
   フッター
=========================== */
#footer {
  background: #000;
  text-align: center;
  padding: 24px;
  font-size: 12px;
  color: var(--color-text-muted);
  border-top: 1px solid rgba(255, 255, 255, 0.05);
}

/* ===========================
   アニメーション
=========================== */
@keyframes fadeInDown {
  from {
    opacity: 0;
    transform: translateY(-20px);
  }

  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(30px);
  }

  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes bounce {

  0%,
  100% {
    transform: rotate(45deg) translateY(0);
  }

  50% {
    transform: rotate(45deg) translateY(6px);
  }
}

@keyframes pulse {

  0%,
  100% {
    box-shadow: 0 4px 24px rgba(232, 200, 74, 0.3);
  }

  50% {
    box-shadow: 0 4px 36px rgba(232, 200, 74, 0.6);
  }
}

@keyframes floatPulse {

  0%,
  100% {
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.4), 0 0 0 0 rgba(232, 200, 74, 0.4);
  }

  50% {
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.4), 0 0 0 8px rgba(232, 200, 74, 0);
  }
}

/* ===========================
   レスポンシブ
=========================== */
@media (min-width: 680px) {
  #manga-viewer {
    border-left: 1px solid rgba(255, 255, 255, 0.05);
    border-right: 1px solid rgba(255, 255, 255, 0.05);
  }

  #ending {
    padding: 100px 48px;
  }

  .cta-inner {
    margin: 0 auto 80px;
    padding: 80px 60px;
  }
}

/* ===========================
   ページ読み込みオーバーレイ
=========================== */
#loading-overlay {
  position: fixed;
  inset: 0;
  background: #000;
  z-index: 9999;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-direction: column;
  gap: 20px;
  transition: opacity 0.6s ease;
}

#loading-overlay.fade-out {
  opacity: 0;
  pointer-events: none;
}

.loading-spinner {
  width: 40px;
  height: 40px;
  border: 3px solid rgba(232, 200, 74, 0.2);
  border-top-color: var(--color-accent);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
}

.loading-text {
  font-size: 13px;
  color: var(--color-text-muted);
  letter-spacing: 0.1em;
}

@keyframes spin {
  to {
    transform: rotate(360deg);
  }
}

/* ===========================
   スクロール演出: 全ページ下からフェードイン
=========================== */
.manga-page.visible {
  transform: translateY(0) translateX(0) !important;
  opacity: 1 !important;
}

/* ===========================
   スクロール進捗テキスト
=========================== */
.reading-milestone {
  position: fixed;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%) scale(0.8);
  background: rgba(0, 0, 0, 0.85);
  border: 1px solid var(--color-accent);
  color: var(--color-accent);
  font-family: var(--font-serif);
  font-size: clamp(16px, 4vw, 22px);
  font-weight: 900;
  padding: 20px 40px;
  border-radius: 12px;
  z-index: 998;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.4s ease, transform 0.4s ease;
  text-align: center;
  letter-spacing: 0.05em;
  backdrop-filter: blur(8px);
}

.reading-milestone.show {
  opacity: 1;
  transform: translate(-50%, -50%) scale(1);
}

/* ===========================
   エピソードナビゲーション
=========================== */
#episode-nav {
  position: fixed;
  top: 8px;
  left: 50%;
  transform: translateX(-50%);
  z-index: 1002;
  display: flex;
  gap: 6px;
  background: rgba(0, 0, 0, 0.7);
  border: 1px solid rgba(255, 255, 255, 0.1);
  border-radius: 100px;
  padding: 4px 6px;
  backdrop-filter: blur(12px);
  opacity: 1;
  transition: opacity 0.5s ease;
  pointer-events: auto;
}

body.scrolled #episode-nav {
  opacity: 0;
  pointer-events: none;
}

.ep-nav-btn {
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.08em;
  color: rgba(255, 255, 255, 0.5);
  text-decoration: none;
  padding: 5px 14px;
  border-radius: 100px;
  transition: background 0.2s ease, color 0.2s ease;
  font-family: var(--font-sans);
}

.ep-nav-btn.active,
.ep-nav-btn:hover {
  background: var(--color-accent);
  color: #000;
}

/* ===========================
   エピソードヘッダー
=========================== */
.episode-anchor {
  display: block;
  height: 0;
  visibility: hidden;
}

.episode-header {
  width: 100%;
  padding: 64px 24px 56px;
  text-align: center;
  position: relative;
  overflow: hidden;
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.8s ease, transform 0.8s ease;
}

.episode-header.visible {
  opacity: 1;
  transform: translateY(0);
}

.episode-header[data-episode="1"] {
  background: linear-gradient(180deg, #000 0%, #0d0d0d 100%);
}

.episode-header[data-episode="2"] {
  background: linear-gradient(180deg, #0a0a12 0%, #0d0d1a 100%);
}

.episode-header::before {
  content: '';
  position: absolute;
  inset: 0;
  background: radial-gradient(ellipse at 50% 100%, rgba(232, 200, 74, 0.08) 0%, transparent 70%);
  pointer-events: none;
}

.episode-header[data-episode="2"]::before {
  background: radial-gradient(ellipse at 50% 100%, rgba(100, 120, 255, 0.08) 0%, transparent 70%);
}

.episode-header-inner {
  position: relative;
  z-index: 1;
  max-width: var(--max-width);
  margin: 0 auto;
}

.episode-label {
  display: inline-block;
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.25em;
  color: var(--color-accent);
  text-transform: uppercase;
  font-family: var(--font-sans);
  margin-bottom: 16px;
  border: 1px solid rgba(232, 200, 74, 0.3);
  padding: 4px 14px;
  border-radius: 100px;
}

.episode-header[data-episode="2"] .episode-label {
  color: #8899ff;
  border-color: rgba(136, 153, 255, 0.3);
}

.episode-title {
  font-family: var(--font-serif);
  font-size: clamp(28px, 7vw, 44px);
  font-weight: 900;
  color: var(--color-text);
  margin-bottom: 16px;
  line-height: 1.2;
}

.episode-desc {
  font-size: clamp(13px, 3.5vw, 15px);
  color: var(--color-text-muted);
  line-height: 1.8;
}

/* 第二話のチャプター区切りは青みがかった色調 */
#manga-viewer2 .chapter-divider {
  background: #0d0d18;
}

#manga-viewer2 .chapter-divider::before {
  background: radial-gradient(ellipse at 50% 50%, rgba(136, 153, 255, 0.06) 0%, transparent 70%);
}

#manga-viewer2 .chapter-divider::after {
  background: linear-gradient(90deg, transparent, rgba(136, 153, 255, 0.3), transparent);
}

#manga-viewer2 .chapter-num {
  color: #8899ff;
}

#manga-viewer2 {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0;
  background: #0d0d18;
  box-shadow: 0 0 80px rgba(0, 0, 0, 0.8);
}

/* ===========================
   幕間セクション
=========================== */
#intermission {
  width: 100%;
  background: #000;
  padding: 0;
  position: relative;
  overflow: hidden;
}

.intermission-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 64px 24px;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 40px;
  position: relative;
}

/* 縦線装飾 */
.intermission-inner::before {
  content: '';
  position: absolute;
  top: 0;
  bottom: 0;
  left: 50%;
  width: 1px;
  background: linear-gradient(180deg, transparent, rgba(232, 200, 74, 0.2), rgba(136, 153, 255, 0.2), transparent);
  transform: translateX(-50%);
}

.intermission-ep1-end {
  text-align: center;
}

.ep-end-label {
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.2em;
  color: rgba(255, 255, 255, 0.3);
  font-family: var(--font-sans);
}

.intermission-content {
  text-align: center;
  background: rgba(255, 255, 255, 0.03);
  border: 1px solid rgba(255, 255, 255, 0.08);
  border-radius: 16px;
  padding: 32px 40px;
  backdrop-filter: blur(8px);
  position: relative;
  z-index: 1;
  opacity: 0;
  transform: scale(0.95);
  transition: opacity 0.8s ease, transform 0.8s ease;
}

.intermission-content.visible {
  opacity: 1;
  transform: scale(1);
}

.intermission-icon {
  font-size: 32px;
  margin-bottom: 16px;
  display: block;
  color: var(--color-accent);
}

.intermission-text {
  font-family: var(--font-serif);
  font-size: clamp(15px, 4vw, 18px);
  color: var(--color-text);
  line-height: 2;
  font-weight: 700;
}

.intermission-next {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 12px;
  position: relative;
  z-index: 1;
}

.next-label {
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.15em;
  color: #8899ff;
  font-family: var(--font-sans);
}

.next-arrow-wrap {
  width: 32px;
  height: 32px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.next-arrow {
  width: 16px;
  height: 16px;
  border-right: 2px solid #8899ff;
  border-bottom: 2px solid #8899ff;
  transform: rotate(45deg);
  animation: bounce 1.5s ease infinite;
}

/* ===========================
   エンディング 第二話完
=========================== */
.ending-ep2-end {
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.2em;
  color: rgba(255, 255, 255, 0.3);
  font-family: var(--font-sans);
  margin-bottom: 32px;
}

/* ===========================
   ヒーロー エピソードバッジ
=========================== */
.hero-episodes {
  margin-bottom: 32px;
  animation: fadeInUp 0.8s ease 0.9s both;
}

.hero-ep-badge {
  display: inline-block;
  background: rgba(136, 153, 255, 0.12);
  border: 1px solid rgba(136, 153, 255, 0.3);
  color: #8899ff;
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.1em;
  padding: 5px 14px;
  border-radius: 100px;
}

/* ===========================
   レスポンシブ追加
=========================== */
@media (min-width: 680px) {
  #manga-viewer2 {
    border-left: 1px solid rgba(255, 255, 255, 0.05);
    border-right: 1px solid rgba(255, 255, 255, 0.05);
  }
}

/* ===========================
   第三話 デザイン（緑〜エメラルドトーン）
=========================== */
.episode-header[data-episode="3"] {
  background: linear-gradient(180deg, #050f0a 0%, #0a1510 100%);
}

.episode-header[data-episode="3"]::before {
  background: radial-gradient(ellipse at 50% 100%, rgba(52, 211, 153, 0.08) 0%, transparent 70%);
}

.episode-header[data-episode="3"] .episode-label {
  color: #34d399;
  border-color: rgba(52, 211, 153, 0.3);
}

#manga-viewer3 {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0;
  background: #050f0a;
  box-shadow: 0 0 80px rgba(0, 0, 0, 0.8);
}

#manga-viewer3 .chapter-divider {
  background: #071209;
}

#manga-viewer3 .chapter-divider::before {
  background: radial-gradient(ellipse at 50% 50%, rgba(52, 211, 153, 0.06) 0%, transparent 70%);
}

#manga-viewer3 .chapter-divider::after {
  background: linear-gradient(90deg, transparent, rgba(52, 211, 153, 0.3), transparent);
}

#manga-viewer3 .chapter-num {
  color: #34d399;
}

/* 第三話への矢印（緑） */
.next-arrow--ep3 {
  border-right-color: #34d399 !important;
  border-bottom-color: #34d399 !important;
}

/* 第三話幕間の縦線 */
#intermission2 .intermission-inner::before {
  background: linear-gradient(180deg, transparent, rgba(136, 153, 255, 0.2), rgba(52, 211, 153, 0.2), transparent);
}

/* エピソードナビ 第三話アクティブ */
.ep-nav-btn[data-ep="3"].active,
.ep-nav-btn[data-ep="3"]:hover {
  background: #34d399;
  color: #000;
}

@media (min-width: 680px) {
  #manga-viewer3 {
    border-left: 1px solid rgba(52, 211, 153, 0.05);
    border-right: 1px solid rgba(52, 211, 153, 0.05);
  }
}

/* ===========================
   第四話 デザイン（ローズピンクトーン）
=========================== */
.episode-header[data-episode="4"] {
  background: linear-gradient(180deg, #0f0508 0%, #150a0d 100%);
}

.episode-header[data-episode="4"]::before {
  background: radial-gradient(ellipse at 50% 100%, rgba(251, 113, 133, 0.08) 0%, transparent 70%);
}

.episode-header[data-episode="4"] .episode-label {
  color: #fb7185;
  border-color: rgba(251, 113, 133, 0.3);
}

#manga-viewer4 {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0;
  background: #0f0508;
  box-shadow: 0 0 80px rgba(0, 0, 0, 0.8);
}

#manga-viewer4 .chapter-divider {
  background: #120609;
}

#manga-viewer4 .chapter-divider::before {
  background: radial-gradient(ellipse at 50% 50%, rgba(251, 113, 133, 0.06) 0%, transparent 70%);
}

#manga-viewer4 .chapter-divider::after {
  background: linear-gradient(90deg, transparent, rgba(251, 113, 133, 0.3), transparent);
}

#manga-viewer4 .chapter-num {
  color: #fb7185;
}

/* 第四話への矢印（ピンク） */
.next-arrow--ep4 {
  border-right-color: #fb7185 !important;
  border-bottom-color: #fb7185 !important;
}

/* 第四話幕間の縦線 */
#intermission3 .intermission-inner::before {
  background: linear-gradient(180deg, transparent, rgba(52, 211, 153, 0.2), rgba(251, 113, 133, 0.2), transparent);
}

/* エピソードナビ 第四話アクティブ */
.ep-nav-btn[data-ep="4"].active,
.ep-nav-btn[data-ep="4"]:hover {
  background: #fb7185;
  color: #fff;
}

@media (min-width: 680px) {
  #manga-viewer4 {
    border-left: 1px solid rgba(251, 113, 133, 0.05);
    border-right: 1px solid rgba(251, 113, 133, 0.05);
  }
}

/* ===========================
   読了特典セクション
=========================== */
#completion-gift {
  position: relative;
  background: linear-gradient(180deg, #0f0508 0%, #050505 100%);
  padding: 80px 20px 60px;
  overflow: hidden;
}

#completion-gift::before {
  content: '';
  position: absolute;
  inset: 0;
  background: radial-gradient(ellipse at 50% 30%, rgba(251, 113, 133, 0.12) 0%, transparent 65%);
  pointer-events: none;
}

.completion-confetti {
  position: absolute;
  inset: 0;
  pointer-events: none;
  overflow: hidden;
}

.confetti-piece {
  position: absolute;
  width: 8px;
  height: 8px;
  border-radius: 2px;
  animation: confettiFall linear forwards;
  opacity: 0;
}

@keyframes confettiFall {
  0% {
    transform: translateY(-20px) rotate(0deg);
    opacity: 1;
  }

  100% {
    transform: translateY(100vh) rotate(720deg);
    opacity: 0;
  }
}

.completion-inner {
  position: relative;
  max-width: var(--max-width);
  margin: 0 auto;
  text-align: center;
}

.completion-badge {
  display: inline-block;
  background: linear-gradient(135deg, #fb7185, #f43f5e);
  color: #fff;
  font-size: 1rem;
  font-weight: 700;
  padding: 8px 24px;
  border-radius: 50px;
  margin-bottom: 20px;
  letter-spacing: 0.05em;
  box-shadow: 0 4px 20px rgba(251, 113, 133, 0.4);
}

.completion-title {
  font-family: var(--font-serif);
  font-size: clamp(2rem, 6vw, 3rem);
  font-weight: 900;
  color: #fff;
  margin-bottom: 12px;
  letter-spacing: 0.05em;
}

.completion-subtitle {
  color: var(--color-text-muted);
  font-size: 0.95rem;
  margin-bottom: 40px;
  line-height: 1.7;
}

/* ギフトカード */
.gift-card {
  background: linear-gradient(135deg, #1a0d10 0%, #200d14 100%);
  border: 1px solid rgba(251, 113, 133, 0.25);
  border-radius: 20px;
  padding: 36px 28px;
  text-align: center;
  box-shadow: 0 8px 40px rgba(251, 113, 133, 0.15), inset 0 1px 0 rgba(255, 255, 255, 0.05);
}

.gift-card-header {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  margin-bottom: 20px;
}

.gift-icon {
  font-size: 2rem;
}

.gift-label {
  font-size: 0.85rem;
  font-weight: 700;
  letter-spacing: 0.15em;
  color: #fb7185;
  text-transform: uppercase;
}

.gift-amount {
  font-family: var(--font-serif);
  font-size: 1.1rem;
  color: var(--color-text-muted);
  margin-bottom: 28px;
  line-height: 1.6;
}

.gift-amount strong {
  display: block;
  font-size: clamp(2rem, 8vw, 3rem);
  font-weight: 900;
  color: #fb7185;
  text-shadow: 0 0 20px rgba(251, 113, 133, 0.5);
  letter-spacing: 0.05em;
}

.gift-code-area {
  background: rgba(0, 0, 0, 0.4);
  border: 1px solid rgba(251, 113, 133, 0.2);
  border-radius: 12px;
  padding: 20px;
  margin-bottom: 24px;
}

.gift-code-label {
  font-size: 0.75rem;
  color: var(--color-text-muted);
  letter-spacing: 0.1em;
  margin-bottom: 10px;
}

.gift-code {
  font-family: 'Courier New', monospace;
  font-size: clamp(1.1rem, 4.5vw, 1.6rem);
  font-weight: 700;
  color: #fbbf24;
  letter-spacing: 0.15em;
  margin-bottom: 14px;
  text-shadow: 0 0 15px rgba(251, 191, 36, 0.4);
  word-break: break-all;
}

.gift-code-copy {
  background: linear-gradient(135deg, #fbbf24, #f59e0b);
  color: #000;
  border: none;
  border-radius: 8px;
  padding: 10px 28px;
  font-size: 0.9rem;
  font-weight: 700;
  cursor: pointer;
  transition: transform 0.15s, box-shadow 0.15s;
  letter-spacing: 0.05em;
}

.gift-code-copy:hover {
  transform: translateY(-2px);
  box-shadow: 0 4px 16px rgba(251, 191, 36, 0.4);
}

.gift-code-copy:active {
  transform: translateY(0);
}

.gift-notice {
  font-size: 0.82rem;
  color: var(--color-text-muted);
  line-height: 1.7;
  margin-bottom: 24px;
  text-align: left;
  padding: 14px 16px;
  background: rgba(255, 255, 255, 0.03);
  border-radius: 8px;
  border-left: 3px solid rgba(251, 113, 133, 0.4);
}

.gift-notice strong {
  color: #fb7185;
}

.gift-notice-sub {
  display: block;
  margin-top: 6px;
  font-size: 0.78rem;
  color: #666;
}

.gift-line-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  background: linear-gradient(135deg, #06c755, #05a847);
  color: #fff;
  text-decoration: none;
  border-radius: 50px;
  padding: 16px 32px;
  font-size: 1rem;
  font-weight: 700;
  letter-spacing: 0.05em;
  transition: transform 0.2s, box-shadow 0.2s;
  box-shadow: 0 4px 20px rgba(6, 199, 85, 0.35);
}

.gift-line-btn:hover {
  transform: translateY(-3px);
  box-shadow: 0 8px 30px rgba(6, 199, 85, 0.5);
}