:root {
  --brand-blue: #00AEEF;
  --text-dark: #1A1A1A;
  --transition-page: 0.6s cubic-bezier(0.23, 1, 0.32, 1);
}

body { font-family: 'Inter', 'Noto Sans JP', sans-serif; color: var(--text-dark); }
.font-display { font-family: 'Oswald', sans-serif; }

.text-brand-blue { color: var(--brand-blue); }
.bg-brand-blue { background-color: var(--brand-blue); }
.border-brand-blue { border-color: var(--brand-blue); }

/* ソーシャルボタン（右固定・フッター共通） */
.social-btn {
  width: 40px; height: 40px;
  display: flex; align-items: center; justify-content: center;
  transition: all 0.3s ease;
  background-color: #d1d5db;
  color: white;
  border-radius: 4px;
}
.footer-social-btn { border-radius: 9999px; }
.btn-facebook:hover { background-color: #1877F2; }
.btn-instagram:hover { background-color: #E4405F; }
.btn-youtube:hover { background-color: #FF0000; }

/* モーダル */
.modal { transition: opacity 0.3s ease; opacity: 0; pointer-events: none; }
.modal.open { opacity: 1; pointer-events: auto; }

/* ページ切り替え */
.page-section.hidden { display: none; }
.page-section.active { display: block; animation: fadeIn 0.5s ease; }
@keyframes fadeIn { from { opacity: 0; } to { opacity: 1; } }

/* ホバーテキスト */
.hover-outline-text {
  color: white;
  font-weight: bold;
  text-align: center;
  font-size: 0.875rem;
  line-height: 1.5;
  text-shadow: 1px 1px 0 #000, -1px 1px 0 #000, 1px -1px 0 #000, -1px -1px 0 #000;
}

/* アウトラインテキスト */
.outline-text-white { color: transparent; -webkit-text-stroke: 1.5px white; }

/* セクションタイトル */
.section-title {
  font-family: 'Oswald', sans-serif;
  font-size: 3rem;
  font-weight: 700;
  text-transform: uppercase;
  line-height: 1.1;
  display: inline-block;
  border-bottom: 5px solid var(--brand-blue);
  padding-bottom: 10px;
  margin-bottom: 2rem;
}

/* ボタン */
.btn-primary {
  background-color: var(--brand-blue);
  color: white;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  padding: 1rem 2rem;
  border-radius: 2px;
  transition: all 0.3s;
}
.btn-primary:hover { background-color: #000; transform: translateY(-2px); }

.btn-outline {
  border: 2px solid var(--brand-blue);
  color: var(--brand-blue);
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  padding: 1rem 2rem;
  border-radius: 2px;
  transition: all 0.3s;
}

/* ナビ */
.nav-link { transition: color 0.3s; cursor: pointer; }
.nav-link:hover { color: var(--brand-blue); }
.mobile-nav-item { font-family: 'Oswald', sans-serif; font-size: 2rem; text-transform: uppercase; font-weight: 700; }

/* アニメーション */
@keyframes fadeInUp { from { opacity: 0; transform: translateY(20px); } to { opacity: 1; transform: translateY(0); } }
.animate-fade-in-up { animation: fadeInUp 0.8s ease-out forwards; }