*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
  html { scroll-behavior: smooth; }
  body {
    font-family: 'Noto Sans JP', sans-serif;
    font-size: 16px;
    line-height: 1.7;
    color: #1a2744;
    background: #fff;
  }
  img { max-width: 100%; height: auto; display: block; }
  a { color: inherit; text-decoration: none; }

  :root {
    --navy: #1a3a6b;
    --navy-light: #2e5fa3;
    --navy-dark: #122748;
    --gold: #c9a227;
    --gold-light: #f5e6b8;
    --gold-dark: #a07c10;
    --gray-bg: #f6f7fa;
    --gray-border: #dde3ef;
    --text-main: #1a2744;
    --text-sub: #4a5568;
    --text-muted: #8a95a8;
    --white: #ffffff;
  }

  .container { max-width: 1080px; margin: 0 auto; padding: 0 24px; }
  .section { padding: 72px 0; }
  .section-title {
    font-size: 26px;
    font-weight: 700;
    color: var(--text-main);
    margin-bottom: 8px;
  }
  .section-title::after {
    content: '';
    display: block;
    width: 36px;
    height: 3px;
    background: var(--gold);
    margin-top: 10px;
    border-radius: 2px;
  }
  .section-sub {
    font-size: 14px;
    color: var(--text-muted);
    margin-bottom: 40px;
    margin-top: 6px;
  }

  /* ===== ナビ ===== */
  .nav {
    background: var(--navy);
    position: sticky;
    top: 0;
    z-index: 100;
    box-shadow: 0 2px 12px rgba(0,0,0,0.18);
  }
  .nav-inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 140px;
  }
  .nav-logo {
    display: flex;
    align-items: center;
    gap: 12px;
  }
  .nav-logo-emblem {
    width: 38px;
    height: 38px;
    border: 2px solid var(--gold);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 18px;
  }
  .nav-logo-text {
    display: flex;
    flex-direction: column;
  }
  .nav-logo-en {
    font-size: 10px;
    color: var(--gold);
    letter-spacing: 0.1em;
    font-weight: 500;
    line-height: 1;
  }
  .nav-logo-ja {
    font-size: 14px;
    font-weight: 700;
    color: var(--white);
    line-height: 1.3;
  }
  .nav-links {
    display: flex;
    align-items: center;
    gap: 24px;
    list-style: none;
  }
  .nav-links a {
    font-size: 13px;
    color: rgba(255,255,255,0.75);
    transition: color 0.2s;
  }
  .nav-links a:hover { color: var(--white); }
  .nav-member {
    background: var(--gold);
    color: var(--navy-dark);
    border: none;
    border-radius: 6px;
    padding: 8px 16px;
    font-size: 12px;
    font-family: 'Noto Sans JP', sans-serif;
    font-weight: 700;
    cursor: pointer;
    transition: background 0.2s;
  }
  .nav-member:hover { background: var(--gold-dark); color: var(--white); }

  .hamburger {
    display: none;
    flex-direction: column;
    gap: 5px;
    cursor: pointer;
    padding: 4px;
  }
  .hamburger span {
    display: block;
    width: 24px;
    height: 2px;
    background: var(--white);
    border-radius: 2px;
  }

  /* ===== ヒーロー ===== */
  .hero {
    background: var(--navy);
    padding: 72px 0 64px;
    position: relative;
    overflow: hidden;
  }
  .hero::before {
    content: '';
    position: absolute;
    inset: 0;
    background:
      radial-gradient(ellipse at 70% 50%, rgba(46,95,163,0.4) 0%, transparent 60%),
      radial-gradient(ellipse at 20% 80%, rgba(201,162,39,0.08) 0%, transparent 50%);
    pointer-events: none;
  }
  .hero-inner {
    display: flex;
    gap: 48px;
    align-items: center;
    position: relative;
    z-index: 1;
  }
  .hero-left { flex: 1; }
  .hero-rotary-label {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    background: rgba(201,162,39,0.15);
    border: 1px solid rgba(201,162,39,0.3);
    border-radius: 20px;
    padding: 5px 14px;
    margin-bottom: 20px;
  }
  .hero-rotary-label span {
    font-size: 11px;
    color: var(--gold);
    font-weight: 500;
    letter-spacing: 0.05em;
  }
  .hero h1 {
    font-size: 38px;
    font-weight: 700;
    color: var(--white);
    line-height: 1.45;
    margin-bottom: 16px;
  }
  .hero h1 em {
    color: var(--gold);
    font-style: normal;
  }
  .hero-theme {
    background: rgba(255,255,255,0.06);
    border-left: 3px solid var(--gold);
    padding: 12px 16px;
    margin-bottom: 20px;
    border-radius: 0 8px 8px 0;
  }
  .hero-theme-label {
    font-size: 10px;
    color: var(--gold);
    letter-spacing: 0.1em;
    margin-bottom: 4px;
  }
  .hero-theme-text {
    font-family: 'Playfair Display', serif;
    font-size: 20px;
    color: var(--white);
    line-height: 1.4;
  }
  .hero-theme-ja {
    font-size: 13px;
    color: rgba(255,255,255,0.6);
    margin-top: 4px;
  }
  .hero-lead {
    font-size: 14px;
    color: rgba(255,255,255,0.65);
    line-height: 1.85;
    margin-bottom: 28px;
  }
  .hero-btns {
    display: flex;
    gap: 12px;
    flex-wrap: wrap;
  }
  .btn-gold {
    background: var(--gold);
    color: var(--navy-dark);
    border: none;
    border-radius: 6px;
    padding: 12px 24px;
    font-size: 14px;
    font-family: 'Noto Sans JP', sans-serif;
    font-weight: 700;
    cursor: pointer;
    transition: background 0.2s, transform 0.15s;
    display: inline-block;
  }
  .btn-gold:hover { background: var(--gold-dark); color: var(--white); transform: translateY(-1px); }
  .btn-ghost {
    background: transparent;
    color: rgba(255,255,255,0.85);
    border: 1px solid rgba(255,255,255,0.3);
    border-radius: 6px;
    padding: 12px 24px;
    font-size: 14px;
    font-family: 'Noto Sans JP', sans-serif;
    cursor: pointer;
    transition: border-color 0.2s;
    display: inline-block;
  }
  .btn-ghost:hover { border-color: rgba(255,255,255,0.7); }

  /* ヒーロー右：クラブ情報カード */
  .hero-right { flex-shrink: 0; }
  .club-info-card {
    background: rgba(255,255,255,0.07);
    border: 1px solid rgba(255,255,255,0.12);
    border-radius: 16px;
    padding: 24px 20px;
    min-width: 200px;
  }
  .club-info-card h3 {
    font-size: 12px;
    color: var(--gold);
    letter-spacing: 0.1em;
    margin-bottom: 14px;
    font-weight: 500;
  }
  .club-info-row {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 8px 0;
    border-bottom: 1px solid rgba(255,255,255,0.08);
    gap: 12px;
  }
  .club-info-row:last-child { border-bottom: none; }
  .club-info-row .label {
    font-size: 11px;
    color: rgba(255,255,255,0.5);
  }
  .club-info-row .value {
    font-size: 12px;
    color: var(--white);
    font-weight: 500;
    text-align: right;
  }

  /* ===== 40周年バナー ===== */
  .anniv-band {
    background: linear-gradient(90deg, var(--gold-dark) 0%, var(--gold) 50%, var(--gold-dark) 100%);
    padding: 14px 0;
  }
  .anniv-band-inner {
    display: flex;
    align-items: center;
    gap: 14px;
  }
  .anniv-badge {
    background: var(--navy);
    color: var(--gold);
    border-radius: 50%;
    width: 44px;
    height: 44px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 10px;
    font-weight: 700;
    text-align: center;
    flex-shrink: 0;
    line-height: 1.2;
    border: 2px solid var(--gold-dark);
  }
  .anniv-band p {
    font-size: 14px;
    color: var(--navy-dark);
    font-weight: 700;
  }
  .anniv-band a {
    margin-left: auto;
    background: var(--navy);
    color: var(--gold);
    border-radius: 6px;
    padding: 6px 14px;
    font-size: 12px;
    font-weight: 700;
    white-space: nowrap;
    flex-shrink: 0;
    transition: background 0.2s;
  }
  .anniv-band a:hover { background: var(--navy-dark); }

  /* ===== 会長挨拶 ===== */
  .president { background: var(--gray-bg); }
  .president-inner {
    display: flex;
    gap: 40px;
    align-items: flex-start;
  }
  .president-avatar {
    width: 180px;
    height: 180px;
    border-radius: 50%;
    background: #dde3ef;
    border: 4px solid var(--gold);
    flex-shrink: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 64px;
    overflow: hidden;
  }
  .president-body h2 {
    font-size: 20px;
    font-weight: 700;
    color: var(--text-main);
    margin-bottom: 4px;
  }
  .president-role {
    font-size: 13px;
    color: var(--gold-dark);
    margin-bottom: 16px;
    font-weight: 500;
  }
  .president-body p {
    font-size: 15px;
    color: var(--text-sub);
    line-height: 1.85;
    margin-bottom: 14px;
  }
  .president-quote {
    border-left: 3px solid var(--gold);
    padding: 12px 20px;
    background: var(--white);
    border-radius: 0 8px 8px 0;
    font-size: 15px;
    font-weight: 700;
    color: var(--text-main);
    line-height: 1.6;
  }
  .president-sig {
    margin-top: 16px;
    font-size: 13px;
    color: var(--text-muted);
    text-align: right;
  }

  /* ===== 活動分野 ===== */
  .activities { background: var(--white); }
  .activity-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 20px;
  }
  .activity-card {
    border: 1px solid var(--gray-border);
    border-radius: 12px;
    padding: 28px 22px;
    background: var(--white);
    transition: border-color 0.2s, transform 0.2s, box-shadow 0.2s;
  }
  .activity-card:hover {
    border-color: var(--gold);
    transform: translateY(-3px);
    box-shadow: 0 8px 24px rgba(201,162,39,0.1);
  }
  .activity-icon {
    width: 48px;
    height: 48px;
    background: var(--gold-light);
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 16px;
    font-size: 22px;
  }
  .activity-card h3 {
    font-size: 17px;
    font-weight: 700;
    color: var(--text-main);
    margin-bottom: 8px;
  }
  .activity-card p {
    font-size: 14px;
    color: var(--text-sub);
    line-height: 1.75;
  }

  /* ===== 例会情報 ===== */
  .meeting { background: var(--navy); padding: 48px 0; }
  .meeting-inner {
    display: flex;
    gap: 40px;
    align-items: center;
  }
  .meeting-left { flex: 1; }
  .meeting-left h2 {
    font-size: 22px;
    font-weight: 700;
    color: var(--white);
    margin-bottom: 20px;
  }
  .meeting-rows {
    display: flex;
    flex-direction: column;
    gap: 10px;
  }
  .meeting-row {
    display: flex;
    gap: 16px;
    align-items: center;
    background: rgba(255,255,255,0.06);
    border-radius: 8px;
    padding: 12px 16px;
  }
  .meeting-row-label {
    font-size: 11px;
    color: var(--gold);
    font-weight: 500;
    min-width: 60px;
  }
  .meeting-row-value {
    font-size: 14px;
    color: var(--white);
  }
  .meeting-right {
    flex-shrink: 0;
    background: rgba(255,255,255,0.06);
    border: 1px solid rgba(201,162,39,0.3);
    border-radius: 16px;
    padding: 24px 28px;
    text-align: center;
  }
  .meeting-right .big-num {
    font-family: 'Playfair Display', serif;
    font-size: 56px;
    color: var(--gold);
    line-height: 1;
  }
  .meeting-right .big-label {
    font-size: 12px;
    color: rgba(255,255,255,0.5);
    margin-top: 4px;
  }

  /* ===== 新着情報 ===== */
  .news { background: var(--gray-bg); }
  .news-list {
    display: flex;
    flex-direction: column;
    gap: 0;
    border: 1px solid var(--gray-border);
    border-radius: 12px;
    overflow: hidden;
    background: var(--white);
  }
  .news-item {
    display: flex;
    gap: 16px;
    padding: 18px 24px;
    border-bottom: 1px solid var(--gray-border);
    align-items: flex-start;
    transition: background 0.15s;
    cursor: pointer;
  }
  .news-item:last-child { border-bottom: none; }
  .news-item:hover { background: var(--gray-bg); }
  .news-thumb {
    width: 60px;
    height: 60px;
    border-radius: 8px;
    background: var(--gold-light);
    flex-shrink: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 24px;
  }
  .news-meta {
    display: flex;
    gap: 8px;
    align-items: center;
    margin-bottom: 4px;
  }
  .news-date {
    font-size: 11px;
    color: var(--text-muted);
  }
  .news-cat {
    background: var(--gold-light);
    color: var(--gold-dark);
    border-radius: 20px;
    font-size: 10px;
    padding: 2px 9px;
    font-weight: 500;
  }
  .news-title {
    font-size: 14px;
    color: var(--text-main);
    font-weight: 500;
    line-height: 1.55;
  }
  .news-more {
    text-align: center;
    margin-top: 24px;
  }
  .btn-navy {
    background: var(--navy);
    color: var(--white);
    border: none;
    border-radius: 6px;
    padding: 12px 28px;
    font-size: 14px;
    font-family: 'Noto Sans JP', sans-serif;
    font-weight: 500;
    cursor: pointer;
    transition: background 0.2s;
    display: inline-block;
  }
  .btn-navy:hover { background: var(--navy-dark); }

  /* ===== 国際交流 ===== */
  .international { background: var(--white); }
  .intl-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 20px;
  }
  .intl-card {
    border: 1px solid var(--gray-border);
    border-radius: 12px;
    padding: 24px;
    display: flex;
    gap: 16px;
    align-items: flex-start;
    transition: border-color 0.2s;
  }
  .intl-card:hover { border-color: var(--gold); }
  .intl-icon {
    width: 48px;
    height: 48px;
    background: var(--gold-light);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 22px;
    flex-shrink: 0;
  }
  .intl-card h3 {
    font-size: 15px;
    font-weight: 700;
    color: var(--text-main);
    margin-bottom: 6px;
  }
  .intl-card p {
    font-size: 13px;
    color: var(--text-sub);
    line-height: 1.7;
  }

  /* ===== CTA ===== */
  .cta-section {
    background: var(--navy);
    padding: 72px 0;
    text-align: center;
  }
  .cta-section h2 {
    font-size: 28px;
    font-weight: 700;
    color: var(--white);
    margin-bottom: 12px;
  }
  .cta-section p {
    font-size: 15px;
    color: rgba(255,255,255,0.6);
    margin-bottom: 32px;
  }
  .cta-btns {
    display: flex;
    gap: 14px;
    justify-content: center;
    flex-wrap: wrap;
  }

  /* ===== フッター ===== */
  .footer { background: #111827; padding: 36px 0; }
  .footer-inner {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 20px;
  }
  .footer-logo {
    display: flex;
    align-items: center;
    gap: 12px;
  }
  .footer-emblem {
    width: 32px;
    height: 32px;
    border: 1.5px solid var(--gold);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 14px;
  }
  .footer-logo-text {
    font-size: 13px;
    color: rgba(255,255,255,0.55);
  }
  .footer-links {
    display: flex;
    gap: 20px;
    list-style: none;
  }
  .footer-links a {
    font-size: 12px;
    color: rgba(255,255,255,0.4);
    transition: color 0.2s;
  }
  .footer-links a:hover { color: rgba(255,255,255,0.75); }
  .footer-copy {
    font-size: 11px;
    color: rgba(255,255,255,0.28);
  }

  /* ===== レスポンシブ ===== */
  @media (max-width: 768px) {
    .nav-links, .nav-member { display: none; }
    .hamburger { display: flex; }
    .hero-inner { flex-direction: column; gap: 28px; }
    .hero h1 { font-size: 26px; }
    .club-info-card { min-width: auto; width: 100%; }
    .president-inner { flex-direction: column; align-items: center; text-align: center; }
    .president-quote { text-align: left; }
    .president-sig { text-align: center; }
    .activity-grid { grid-template-columns: 1fr; }
    .meeting-inner { flex-direction: column; }
    .intl-grid { grid-template-columns: 1fr; }
    .footer-inner { flex-direction: column; text-align: center; }
    .footer-copy { text-align: center; }
    .anniv-band a { display: none; }
  }

  @keyframes fadeUp {
    from { opacity: 0; transform: translateY(20px); }
    to   { opacity: 1; transform: translateY(0); }
  }
  .hero-left  { animation: fadeUp 0.6s ease both; }
  .hero-right { animation: fadeUp 0.6s 0.15s ease both; }

/* ===== モバイルメニュー ===== */
.nav-links.is-open {
  display: flex !important;
  flex-direction: column;
  position: absolute;
  top: 140px;
  left: 0;
  right: 0;
  background: var(--navy);
  padding: 16px 24px;
  gap: 16px;
  z-index: 99;
}

/* ===== 個別記事ページ ===== */
.single-main { padding: 48px 0 72px; }
.single-meta { display: flex; gap: 10px; align-items: center; margin-bottom: 12px; }
.single-date { font-size: 13px; color: var(--text-muted); }
.single-title { font-size: 26px; font-weight: 700; color: var(--text-main); margin-bottom: 24px; line-height: 1.5; }
.single-thumbnail { border-radius: var(--border-radius, 12px); overflow: hidden; margin-bottom: 28px; }
.single-thumbnail img { width: 100%; height: auto; }
.single-content { font-size: 16px; color: var(--text-sub); line-height: 1.85; }
.single-content p { margin-bottom: 1.2em; }
.single-back { margin-top: 40px; }

/* ===== フェードアップ ===== */
.fade-up {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 0.5s ease, transform 0.5s ease;
}
.fade-up.is-visible {
  opacity: 1;
  transform: translateY(0);
}

/* ===== ドロップダウンメニュー ===== */
.nav-links li {
  position: relative;
}
.nav-links .sub-menu {
  display: none;
  position: absolute;
  top: 100%;
  left: 0;
  background: var(--navy-dark);
  border-top: 2px solid var(--gold);
  border-radius: 0 0 8px 8px;
  min-width: 180px;
  list-style: none;
  box-shadow: 0 8px 24px rgba(0,0,0,0.2);
  z-index: 200;
  padding: 8px 0;
}
.nav-links li:hover > .sub-menu {
  display: block;
}
.nav-links .sub-menu li a {
  display: block;
  padding: 10px 16px;
  font-size: 12px;
  color: rgba(255,255,255,0.8);
  white-space: nowrap;
  border-bottom: 1px solid rgba(255,255,255,0.05);
  transition: background .15s, color .15s;
}
.nav-links .sub-menu li:last-child a {
  border-bottom: none;
}
.nav-links .sub-menu li a:hover {
  background: rgba(201,162,39,0.15);
  color: var(--gold);
}
/* 親メニューに▼を表示 */
.nav-links .menu-item-has-children > a::after {
  content: ' ▾';
  font-size: 10px;
  opacity: 0.7;
}