:root {
  /* ライトモード（デフォルト） */
  --bg-color: #f4f6fa;
  --bg-gradient: radial-gradient(circle at top right, #eef2ff 0%, #f4f6fa 100%);
  --text-color: #0f172a;
  --text-muted: #64748b;
  --text-inverse: #f8fafc;
  --card-bg: rgba(255, 255, 255, 0.7);
  --card-border: rgba(15, 23, 42, 0.08);
  --accent-color: #4f46e5;
  --accent-glow: rgba(79, 70, 229, 0.15);
  --glass-shadow: 0 16px 40px 0 rgba(31, 38, 135, 0.06);
  
  /* 虹色パステル（大目標・中目標のテーマカラー） */
  --pastel-center: #FFE599; /* 大目標：パステルイエロー */
  --pastel-1: #FFB3BA;      /* 中1: パステルピンク */
  --pastel-2: #FFDFBA;      /* 中2: パステルオレンジ */
  --pastel-3: #FFFFBA;      /* 中3: パステルイエロー */
  --pastel-4: #BAFFC9;      /* 中4: パステルグリーン */
  --pastel-5: #BAE1FF;      /* 中5: パステルブルー */
  --pastel-6: #D1F7D1;      /* 中6: パステルミント */
  --pastel-7: #E8C4EC;      /* 中7: パステルラベンダー */
  --pastel-8: #FFC9DE;      /* 中8: パステルピンクパープル */
  
  --rainbow-gradient: linear-gradient(135deg, #FFB3BA 0%, #FFDFBA 15%, #FFFFBA 30%, #BAFFC9 45%, #BAE1FF 60%, #E8C4EC 80%, #FFB3BA 100%);
  --rainbow-pastel-border: linear-gradient(135deg, rgba(255, 179, 186, 0.8), rgba(186, 225, 255, 0.8));
  
  --transition-speed: 0.3s;
  --border-radius: 16px;
  --border-radius-lg: 24px;
  --max-width: 1200px;
}

/* 基本リセット & タイポグラフィ */
* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

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

body {
  font-family: 'Outfit', 'Inter', 'Noto Sans JP', sans-serif;
  background: var(--bg-color);
  background-image: var(--bg-gradient);
  background-attachment: fixed;
  color: var(--text-color);
  line-height: 1.6;
  overflow-x: hidden;
  transition: background var(--transition-speed), color var(--transition-speed);
}

a {
  color: inherit;
  text-decoration: none;
  transition: color var(--transition-speed);
}

img {
  max-width: 100%;
  height: auto;
  display: block;
}

/* レイアウトユーティリティ */
.container {
  width: 100%;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 2rem;
}

.section {
  padding: 6rem 0;
  position: relative;
}

/* ガラスモーフィズム汎用クラス */
.glass {
  background: var(--card-bg);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border: 1px solid var(--card-border);
  box-shadow: var(--glass-shadow);
  border-radius: var(--border-radius);
}

/* ボタン */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.8rem 1.8rem;
  border-radius: 50px;
  font-weight: 600;
  cursor: pointer;
  transition: all var(--transition-speed) cubic-bezier(0.4, 0, 0.2, 1);
  border: none;
  font-size: 1rem;
}

.btn-primary {
  background: var(--rainbow-gradient);
  color: #1a1a3a;
  box-shadow: 0 4px 15px rgba(255, 179, 186, 0.4);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(255, 179, 186, 0.6);
}

.btn-secondary {
  background: var(--card-bg);
  border: 1px solid var(--card-border);
  color: var(--text-color);
  backdrop-filter: blur(10px);
}

.btn-secondary:hover {
  background: rgba(255, 255, 255, 0.1);
  transform: translateY(-2px);
}

/* ヘッダー */
header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  border-bottom: 1px solid var(--card-border);
  background: rgba(244, 246, 250, 0.6);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  transition: background var(--transition-speed);
}

header .container {
  display: flex;
  justify-content: space-between;
  align-items: center;
  height: 80px;
}

.logo {
  display: flex;
  align-items: center;
  gap: 0.8rem;
  font-size: 1.4rem;
  font-weight: 800;
  letter-spacing: -0.5px;
}

.logo img {
  width: 40px;
  height: 40px;
  border-radius: 10px;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 2rem;
  list-style: none;
}

.nav-links a:hover {
  color: var(--accent-color);
}

.nav-right {
  display: flex;
  align-items: center;
  gap: 1.5rem;
}

/* 言語切り替えトグル */
.lang-toggle {
  background: none;
  border: 1px solid var(--card-border);
  cursor: pointer;
  color: var(--text-color);
  font-size: 0.85rem;
  font-weight: 700;
  display: flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  border-radius: 50%;
  transition: all var(--transition-speed);
  font-family: 'Outfit', sans-serif;
}

.lang-toggle:hover {
  background: rgba(0, 0, 0, 0.05);
  border-color: var(--accent-color);
  color: var(--accent-color);
}

/* ヒーローセクション */
.hero {
  padding-top: 10rem;
  padding-bottom: 6rem;
  display: flex;
  align-items: center;
  min-height: 100vh;
}

.hero-grid {
  display: grid;
  grid-template-columns: 1.2fr 0.8fr;
  gap: 4rem;
  align-items: center;
}

.hero-content h1 {
  font-size: 3.5rem;
  line-height: 1.15;
  font-weight: 800;
  margin-bottom: 1.5rem;
  letter-spacing: -1px;
}

.hero-content h1 span {
  background: var(--rainbow-gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.hero-content p {
  font-size: 1.25rem;
  color: var(--text-muted);
  margin-bottom: 2.5rem;
}

.hero-actions {
  display: flex;
  gap: 1rem;
  margin-bottom: 3rem;
}

.store-badge {
  display: inline-block;
  background: #000;
  border: 1px solid #333;
  padding: 0.6rem 1.5rem;
  border-radius: 10px;
  color: #fff;
  transition: transform var(--transition-speed);
}

.store-badge:hover {
  transform: translateY(-2px);
}

.store-badge-content {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  text-align: left;
}

.store-badge-icon {
  font-size: 1.8rem;
}

.store-badge-text span {
  display: block;
  font-size: 0.7rem;
  text-transform: uppercase;
}

.store-badge-text strong {
  display: block;
  font-size: 1.1rem;
  font-weight: 600;
}

.hero-image {
  position: relative;
  display: flex;
  justify-content: center;
}

.hero-image img {
  width: 100%;
  max-width: 320px;
  border-radius: 40px;
  border: 12px solid #1c1830;
  box-shadow: 
    0 20px 50px rgba(0,0,0,0.4), 
    0 0 0 2px rgba(255,255,255,0.08) inset;
  animation: float 6s ease-in-out infinite;
  background-color: #000;
}

@keyframes float {
  0% { transform: translateY(0px); }
  50% { transform: translateY(-15px); }
  100% { transform: translateY(0px); }
}



/* 特徴紹介 */
.features-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 2.5rem;
}

.feature-card {
  padding: 3rem 2rem;
  text-align: left;
  transition: all var(--transition-speed);
  position: relative;
  overflow: hidden;
}

.feature-card:hover {
  transform: translateY(-8px);
  border-color: var(--accent-color);
  box-shadow: 0 12px 30px var(--accent-glow);
}

.feature-icon {
  font-size: 2.5rem;
  margin-bottom: 1.5rem;
  display: inline-block;
  background: var(--rainbow-gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.feature-card h3 {
  font-size: 1.4rem;
  font-weight: 700;
  margin-bottom: 1rem;
}

.feature-card p {
  color: var(--text-muted);
}

/* 料金プラン */
.pricing {
  text-align: center;
}

.pricing-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 3rem;
  margin-top: 4rem;
  justify-content: center;
}

.pricing-card {
  padding: 4rem 2.5rem;
  text-align: left;
  display: flex;
  flex-direction: column;
  position: relative;
}

.pricing-card.premium {
  border: 1px solid transparent;
  background-clip: padding-box, border-box;
  background-origin: padding-box, border-box;
  background-image: linear-gradient(var(--card-bg), var(--card-bg)), var(--rainbow-pastel-border);
}

.pricing-badge {
  position: absolute;
  top: 1.5rem;
  right: 1.5rem;
  background: var(--rainbow-gradient);
  color: #1a1a3a;
  padding: 0.3rem 0.8rem;
  font-size: 0.75rem;
  font-weight: 700;
  border-radius: 20px;
}

.pricing-card h3 {
  font-size: 1.8rem;
  font-weight: 800;
  margin-bottom: 0.5rem;
}

.pricing-price {
  font-size: 2.5rem;
  font-weight: 800;
  margin-bottom: 2rem;
}

.pricing-price span {
  font-size: 1rem;
  color: var(--text-muted);
  font-weight: 400;
}

.pricing-features {
  list-style: none;
  margin-bottom: 3rem;
  flex-grow: 1;
}

.pricing-features li {
  margin-bottom: 1rem;
  display: flex;
  align-items: center;
  gap: 0.8rem;
}

.pricing-features li i {
  color: var(--accent-color);
}

.pricing-card .btn {
  width: 100%;
}

/* FAQ */
.faq {
  max-width: 800px;
  margin: 0 auto;
}

.faq-list {
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
  margin-top: 4rem;
}

.faq-item {
  border-radius: 12px;
  overflow: hidden;
  transition: all var(--transition-speed);
}

.faq-question {
  padding: 1.5rem 2rem;
  width: 100%;
  text-align: left;
  background: none;
  border: none;
  color: var(--text-color);
  font-size: 1.1rem;
  font-weight: 700;
  cursor: pointer;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 1rem;
}

.faq-answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.4s cubic-bezier(0.4, 0, 0.2, 1), padding 0.4s;
  padding: 0 2rem;
  color: var(--text-muted);
}

.faq-item.active {
  background: rgba(0, 0, 0, 0.02);
}

.faq-item.active .faq-answer {
  max-height: 300px; /* 任意の十分な高さ */
  padding-bottom: 1.5rem;
}

.faq-icon {
  font-size: 1.5rem;
  transition: transform var(--transition-speed);
}

.faq-item.active .faq-icon {
  transform: rotate(45deg);
}

/* フッター */
footer {
  padding: 4rem 0 2rem;
  border-top: 1px solid var(--card-border);
  background: rgba(244, 246, 250, 0.9);
}

.footer-content {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 3rem;
  flex-wrap: wrap;
  gap: 2rem;
}

.footer-links {
  display: flex;
  gap: 2rem;
  list-style: none;
}

.footer-copyright {
  text-align: center;
  color: var(--text-muted);
  font-size: 0.9rem;
}

/* 各個別ページ用スタイル（プライバシー、お問い合わせ） */
.sub-page {
  padding-top: 8rem;
  padding-bottom: 6rem;
  min-height: 80vh;
}

.sub-page-title {
  font-size: 3rem;
  font-weight: 800;
  text-align: center;
  margin-bottom: 3rem;
}

/* プライバシーポリシー */
.policy-content {
  max-width: 900px;
  margin: 0 auto;
  padding: 3rem;
}

.policy-content h2 {
  font-size: 1.5rem;
  font-weight: 800;
  margin: 2.5rem 0 1.2rem;
  border-left: 4px solid var(--accent-color);
  padding-left: 1rem;
}

.policy-content h2:first-of-type {
  margin-top: 0;
}

.policy-content h3 {
  font-size: 1.15rem;
  font-weight: 700;
  margin: 1.5rem 0 0.8rem;
}

.policy-content p {
  margin-bottom: 1.2rem;
  color: var(--text-color);
  opacity: 0.9;
}

.policy-content ul {
  margin-left: 1.5rem;
  margin-bottom: 1.5rem;
}

.policy-content li {
  margin-bottom: 0.5rem;
}

/* お問い合わせ */
.contact-container {
  max-width: 600px;
  margin: 0 auto;
  text-align: center;
  padding: 4rem 2rem;
}

.contact-text {
  font-size: 1.15rem;
  color: var(--text-muted);
  margin-bottom: 3rem;
}

.contact-card {
  padding: 3rem;
  border-radius: var(--border-radius-lg);
  box-shadow: var(--glass-shadow);
}

.contact-card h3 {
  font-size: 1.5rem;
  margin-bottom: 1.5rem;
  font-weight: 800;
}

/* レスポンシブ */
@media (max-width: 968px) {
  .hero-grid {
    grid-template-columns: 1fr;
    gap: 3rem;
    text-align: center;
  }
  
  .hero-content h1 {
    font-size: 2.8rem;
  }

  h2 {
    font-size: 2.2rem !important;
  }
  
  .hero-actions {
    justify-content: center;
  }
  
  .hero-image img {
    max-width: 280px;
  }
}

@media (max-width: 768px) {
  .container {
    padding: 0 1.5rem;
  }
  
  header .container {
    height: 70px;
  }
  
  .nav-links {
    display: none;
  }
  
  .nav-right {
    gap: 0.8rem;
  }
  
  #navContactBtn {
    padding: 0.5rem 1.2rem;
    font-size: 0.9rem;
  }
  
  .section {
    padding: 4rem 0;
  }
  
  .pricing-grid {
    grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
    gap: 2rem;
  }

  .pricing-card {
    padding: 2.5rem 1.5rem;
  }
  
  .footer-content {
    flex-direction: column;
    text-align: center;
  }
  
  .footer-links {
    flex-direction: column;
    gap: 1rem;
  }
  
  .policy-content {
    padding: 2rem 1.25rem;
  }

  .contact-container {
    padding: 2rem 1rem;
  }

  .contact-card {
    padding: 2rem 1.5rem;
  }

  .sub-page-title {
    font-size: 2.2rem;
    margin-bottom: 2rem;
  }
}

@media (max-width: 576px) {
  .logo span {
    display: none;
  }

  .nav-right {
    gap: 0.6rem;
  }

  #navContactBtn {
    padding: 0.4rem 1rem;
    font-size: 0.85rem;
  }

  .hero-content h1 {
    font-size: 2.4rem;
    word-break: keep-all;
    overflow-wrap: break-word;
  }

  h2 {
    font-size: 2.0rem !important;
  }

  .hero-actions {
    flex-direction: column;
    align-items: center;
    gap: 1rem;
  }

  .hero-actions .store-badge,
  .hero-actions .btn {
    width: 100%;
    max-width: 280px;
    justify-content: center;
  }
}

@media (max-width: 400px) {
  .nav-right {
    gap: 0.4rem;
  }

  #navContactBtn {
    padding: 0.4rem 0.8rem;
    font-size: 0.8rem;
  }

  .lang-toggle {
    width: 36px;
    height: 36px;
    font-size: 0.8rem;
  }

  .hero-content h1 {
    font-size: 2.2rem;
  }

  h2 {
    font-size: 1.8rem !important;
  }
}