/* ===== ブログ記事 共通CSS ===== */
:root {
  --black:     #0D0A06;
  --dark:      #1A1208;
  --dark2:     #2A1E0E;
  --ivory:     #F5ECD8;
  --ivory2:    #EDD9BA;
  --white:     #FDFAF4;
  --amber:     #C8813A;
  --amber-l:   #E0A060;
  --font-min:  'Shippori Mincho B1', 'Noto Serif JP', serif;
  --font-sans: 'Noto Sans JP', sans-serif;
  --font-en:   'Montserrat', sans-serif;
}
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { font-size: 16px; scroll-behavior: smooth; }
body { background: var(--white); color: var(--dark); font-family: var(--font-sans); font-weight: 300; line-height: 1.9; overflow-x: hidden; }

/* ヘッダー */
header { position: fixed; top: 0; left: 0; right: 0; z-index: 100; display: flex; align-items: center; justify-content: space-between; padding: 20px 40px; transition: background 0.4s, padding 0.4s; }
header.scrolled { background: var(--dark); padding: 14px 40px; }
.logo-wrap a { text-decoration: none; }
.logo-mark { font-family: var(--font-en); font-size: 1.3rem; font-weight: 600; letter-spacing: 0.15em; color: var(--white); }
.logo-sub { font-family: var(--font-en); font-size: 0.55rem; letter-spacing: 0.25em; color: var(--ivory2); display: block; margin-top: 2px; }
.hamburger { display: flex; flex-direction: column; gap: 5px; cursor: pointer; padding: 8px; background: none; border: none; }
.hamburger span { display: block; width: 24px; height: 1px; background: var(--white); transition: all 0.3s; }
.hamburger-label { font-family: var(--font-en); font-size: 0.55rem; letter-spacing: 0.2em; color: var(--white); text-align: center; margin-top: 4px; }

/* フルスクリーンメニュー */
.fullmenu { position: fixed; inset: 0; background: var(--dark); z-index: 200; display: flex; flex-direction: column; align-items: center; justify-content: center; opacity: 0; pointer-events: none; transition: opacity 0.5s; }
.fullmenu.open { opacity: 1; pointer-events: all; }
.fullmenu-close { position: absolute; top: 30px; right: 40px; background: none; border: none; color: var(--ivory); font-family: var(--font-en); font-size: 0.7rem; letter-spacing: 0.2em; cursor: pointer; display: flex; flex-direction: column; align-items: center; gap: 6px; }
.fullmenu-close svg { width: 20px; height: 20px; stroke: var(--ivory); }
.fullmenu nav a { display: block; font-family: var(--font-min); font-size: clamp(1.8rem, 4vw, 3rem); color: var(--ivory); text-decoration: none; letter-spacing: 0.15em; padding: 10px 0; border-bottom: 1px solid rgba(255,255,255,0.08); transition: color 0.3s; }
.fullmenu nav a:hover { color: var(--amber-l); }
.fullmenu-contact { margin-top: 40px; display: flex; gap: 20px; flex-wrap: wrap; justify-content: center; }
.fullmenu-contact a { font-family: var(--font-en); font-size: 0.7rem; letter-spacing: 0.2em; color: var(--ivory2); text-decoration: none; padding: 10px 24px; border: 1px solid rgba(255,255,255,0.2); transition: all 0.3s; }
.fullmenu-contact a:hover { background: var(--amber); border-color: var(--amber); color: var(--white); }

/* 記事ヒーロー */
.article-hero { background: var(--dark); padding: 130px 40px 60px; position: relative; overflow: hidden; }
.article-hero::before { content: ''; position: absolute; inset: 0; background: radial-gradient(ellipse at 70% 50%, rgba(200,129,58,0.12) 0%, transparent 60%); }
.article-hero-inner { max-width: 820px; margin: 0 auto; position: relative; z-index: 1; }
.article-cat { display: inline-block; font-family: var(--font-en); font-size: 0.6rem; letter-spacing: 0.3em; color: var(--amber-l); border: 1px solid var(--amber); padding: 4px 14px; margin-bottom: 20px; }
.article-hero h1 { font-family: var(--font-min); font-size: clamp(1.6rem, 3.5vw, 2.6rem); color: var(--white); font-weight: 400; line-height: 1.65; margin-bottom: 20px; }
.article-meta { display: flex; align-items: center; gap: 24px; flex-wrap: wrap; }
.article-meta span { font-family: var(--font-en); font-size: 0.65rem; letter-spacing: 0.15em; color: var(--ivory2); }
.article-meta .dot { color: var(--amber); }

/* パンくず */
.breadcrumb { background: rgba(26,18,8,0.95); padding: 12px 40px; }
.breadcrumb ul { display: flex; align-items: center; gap: 8px; list-style: none; font-family: var(--font-en); font-size: 0.6rem; letter-spacing: 0.15em; max-width: 820px; margin: 0 auto; }
.breadcrumb li { color: var(--ivory2); }
.breadcrumb li a { color: var(--amber-l); text-decoration: none; }
.breadcrumb li::after { content: '/'; margin-left: 8px; opacity: 0.4; }
.breadcrumb li:last-child::after { display: none; }

/* 記事サムネイル */
.article-thumb { width: 100%; max-height: 480px; overflow: hidden; }
.article-thumb img { width: 100%; height: 100%; object-fit: cover; display: block; }

/* 記事本文レイアウト */
.article-body-wrap { max-width: 820px; margin: 0 auto; padding: 64px 40px 100px; }

/* 記事本文タイポグラフィ */
.article-body h2 { font-family: var(--font-min); font-size: 1.45rem; font-weight: 400; color: var(--dark); border-left: 3px solid var(--amber); padding-left: 16px; margin: 56px 0 20px; line-height: 1.6; }
.article-body h3 { font-family: var(--font-min); font-size: 1.1rem; font-weight: 400; color: var(--dark2); margin: 36px 0 14px; padding-bottom: 6px; border-bottom: 1px solid rgba(200,129,58,0.3); }
.article-body p { font-size: 0.92rem; line-height: 2; color: #333; margin-bottom: 18px; }
.article-body ul, .article-body ol { padding-left: 1.4em; margin-bottom: 20px; }
.article-body li { font-size: 0.9rem; line-height: 1.9; color: #333; margin-bottom: 6px; }
.article-body strong { font-weight: 500; color: var(--dark); }

/* ポイントボックス */
.tip-box { background: rgba(200,129,58,0.08); border: 1px solid rgba(200,129,58,0.3); border-left: 4px solid var(--amber); padding: 24px 28px; margin: 32px 0; border-radius: 0 4px 4px 0; }
.tip-box .tip-label { font-family: var(--font-en); font-size: 0.6rem; letter-spacing: 0.25em; color: var(--amber); display: block; margin-bottom: 10px; }
.tip-box p { margin: 0; font-size: 0.88rem; }

/* 注意ボックス */
.note-box { background: rgba(13,10,6,0.04); border: 1px solid rgba(0,0,0,0.1); padding: 20px 24px; margin: 24px 0; }
.note-box .note-label { font-family: var(--font-en); font-size: 0.58rem; letter-spacing: 0.2em; color: #888; display: block; margin-bottom: 8px; }
.note-box p { margin: 0; font-size: 0.82rem; color: #555; }

/* テーブル */
.article-table { width: 100%; border-collapse: collapse; margin: 28px 0; font-size: 0.85rem; }
.article-table th { background: var(--dark); color: var(--ivory); padding: 12px 16px; text-align: left; font-weight: 400; font-family: var(--font-sans); letter-spacing: 0.05em; }
.article-table td { padding: 12px 16px; border-bottom: 1px solid rgba(0,0,0,0.07); color: #333; }
.article-table tr:nth-child(even) td { background: rgba(200,129,58,0.04); }
.article-table .td-amt { font-family: var(--font-en); font-size: 0.95rem; color: var(--amber); font-weight: 600; }

/* ステップ */
.step-list { list-style: none; padding: 0; margin: 24px 0; }
.step-list li { display: flex; gap: 20px; align-items: flex-start; padding: 20px 0; border-bottom: 1px solid rgba(0,0,0,0.07); }
.step-list li:last-child { border-bottom: none; }
.step-num { flex-shrink: 0; width: 40px; height: 40px; background: var(--dark); color: var(--amber-l); font-family: var(--font-en); font-size: 0.8rem; font-weight: 600; letter-spacing: 0.1em; display: flex; align-items: center; justify-content: center; }
.step-content h4 { font-family: var(--font-min); font-size: 1rem; font-weight: 400; margin-bottom: 6px; color: var(--dark); }
.step-content p { margin: 0; font-size: 0.85rem; color: #555; line-height: 1.85; }

/* 記事内CTA */
.article-cta { background: var(--dark); padding: 36px 32px; margin: 48px 0; text-align: center; }
.article-cta p { color: var(--ivory2); font-size: 0.85rem; margin-bottom: 20px; line-height: 1.8; }
.article-cta a { display: inline-block; padding: 14px 36px; background: var(--amber); color: var(--white); font-family: var(--font-en); font-size: 0.7rem; letter-spacing: 0.2em; text-decoration: none; transition: opacity 0.3s; }
.article-cta a:hover { opacity: 0.85; }

/* まとめボックス */
.summary-box { background: var(--dark); color: var(--ivory); padding: 36px 32px; margin-top: 48px; }
.summary-box h3 { font-family: var(--font-min); font-size: 1.1rem; font-weight: 400; color: var(--amber-l); margin-bottom: 16px; }
.summary-box ul { padding-left: 1.2em; }
.summary-box li { font-size: 0.88rem; line-height: 1.9; color: var(--ivory2); margin-bottom: 6px; }

/* 著者プロフィール */
.author-section { border-top: 1px solid rgba(0,0,0,0.1); padding-top: 40px; margin-top: 48px; display: flex; gap: 24px; align-items: flex-start; }
.author-img { width: 80px; height: 80px; border-radius: 50%; overflow: hidden; flex-shrink: 0; border: 2px solid var(--amber); }
.author-img img { width: 100%; height: 100%; object-fit: cover; }
.author-info .author-name-en { font-family: var(--font-en); font-size: 0.58rem; letter-spacing: 0.25em; color: var(--amber); display: block; margin-bottom: 4px; }
.author-info h4 { font-family: var(--font-min); font-size: 1.05rem; font-weight: 400; margin-bottom: 8px; }
.author-info p { font-size: 0.8rem; color: #555; line-height: 1.85; margin: 0; }

/* 関連記事 */
.related-section { background: rgba(200,129,58,0.06); padding: 60px 40px; }
.related-inner { max-width: 820px; margin: 0 auto; }
.related-title { font-family: var(--font-en); font-size: 0.65rem; letter-spacing: 0.3em; color: var(--amber); margin-bottom: 8px; }
.related-title-jp { font-family: var(--font-min); font-size: 1.3rem; font-weight: 400; margin-bottom: 32px; }
.related-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; }
@media (max-width: 700px) { .related-grid { grid-template-columns: 1fr; } }
.related-card { background: var(--white); text-decoration: none; display: block; transition: transform 0.3s; }
.related-card:hover { transform: translateY(-4px); }
.related-card img { width: 100%; aspect-ratio: 16/9; object-fit: cover; display: block; }
.related-card-body { padding: 16px; }
.related-card .rc-cat { font-family: var(--font-en); font-size: 0.58rem; letter-spacing: 0.2em; color: var(--amber); display: block; margin-bottom: 6px; }
.related-card h4 { font-family: var(--font-min); font-size: 0.88rem; font-weight: 400; color: var(--dark); line-height: 1.6; }

/* CTAバナー */
.cta-strip { background: var(--amber); padding: 60px 40px; text-align: center; }
.cta-strip h2 { font-family: var(--font-min); font-size: clamp(1.4rem, 3vw, 2rem); color: var(--white); font-weight: 400; margin-bottom: 14px; }
.cta-strip p { color: rgba(255,255,255,0.88); font-size: 0.85rem; margin-bottom: 28px; }
.cta-strip-btns { display: flex; gap: 14px; justify-content: center; flex-wrap: wrap; }
.btn-dark { display: inline-flex; align-items: center; gap: 8px; padding: 14px 30px; background: var(--dark); color: var(--white); font-family: var(--font-en); font-size: 0.7rem; letter-spacing: 0.18em; text-decoration: none; transition: opacity 0.3s; }
.btn-dark:hover { opacity: 0.8; }
.btn-white-outline { display: inline-flex; align-items: center; gap: 8px; padding: 14px 30px; border: 1px solid rgba(255,255,255,0.6); color: var(--white); font-family: var(--font-en); font-size: 0.7rem; letter-spacing: 0.18em; text-decoration: none; transition: all 0.3s; }
.btn-white-outline:hover { background: rgba(255,255,255,0.15); }

/* フッター */
footer { background: var(--black); color: var(--ivory2); padding: 50px 40px 28px; }
.footer-inner { max-width: 1160px; margin: 0 auto; display: flex; justify-content: space-between; align-items: flex-start; flex-wrap: wrap; gap: 32px; padding-bottom: 28px; border-bottom: 1px solid rgba(255,255,255,0.07); margin-bottom: 20px; }
.footer-logo { font-family: var(--font-en); font-size: 1.1rem; letter-spacing: 0.2em; color: var(--white); }
.footer-logo span { display: block; font-size: 0.55rem; letter-spacing: 0.25em; color: var(--ivory2); margin-top: 4px; }
.footer-nav { display: flex; gap: 40px; flex-wrap: wrap; }
.footer-nav-col h4 { font-family: var(--font-en); font-size: 0.58rem; letter-spacing: 0.25em; color: var(--amber-l); margin-bottom: 14px; }
.footer-nav-col a { display: block; font-size: 0.75rem; color: var(--ivory2); text-decoration: none; margin-bottom: 9px; transition: color 0.3s; }
.footer-nav-col a:hover { color: var(--amber-l); }
.footer-copy { font-family: var(--font-en); font-size: 0.58rem; letter-spacing: 0.12em; color: rgba(255,255,255,0.25); text-align: right; }

/* フェードイン */
.fade-in { opacity: 0; transform: translateY(24px); transition: opacity 0.6s ease, transform 0.6s ease; }
.fade-in.visible { opacity: 1; transform: none; }

/* モバイル */
@media (max-width: 768px) {
  header { padding: 16px 24px; }
  .article-hero { padding: 110px 24px 48px; }
  .breadcrumb { padding: 12px 24px; }
  .article-body-wrap { padding: 48px 24px 70px; }
  .related-section { padding: 48px 24px; }
  .cta-strip { padding: 48px 24px; }
  footer { padding: 40px 24px 24px; }
  .author-section { flex-direction: column; }
}