/* ===== TOKENS（TOPと完全共通） ===== */
:root {
  --teal: #65e1ea;
  --teal-dark: #1db8c4;
  --teal-deeper: #0e8f99;
  --teal-light: #e8fafc;
  --teal-mid: #b2eff3;
  --ink: #111418;
  --ink-mid: #2d3640;
  --ink-light: #5a6470;
  --ink-faint: #8a929c;
  --surface: #f7f9fa;
  --surface-2: #eef1f3;
  --white: #ffffff;
  --border: #dde2e7;
  --border-light: #edf0f2;
  --accent-warm: #f4a94e;
  --accent-warm-light: #fef4e6;
  --font-sans: 'DM Sans', 'Noto Sans JP', sans-serif;
  --font-serif: 'Noto Serif JP', serif;
  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 16px;
  --radius-xl: 24px;
  --shadow-sm: 0 1px 4px rgba(0,0,0,0.06);
  --shadow-md: 0 4px 16px rgba(0,0,0,0.08);
}

*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body {
  font-family: var(--font-sans);
  color: var(--ink);
  background: var(--white);
  line-height: 1.7;
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
}
a { color: inherit; text-decoration: none; }
img { max-width: 100%; display: block; }

/* ===== HEADER（TOPと同一） ===== */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(255,255,255,0.95);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--border-light);
}
.header-inner {
  max-width: 1160px;
  margin: 0 auto;
  padding: 0 24px;
  height: 60px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}
.site-logo { display: flex; align-items: center; gap: 10px; flex-shrink: 0; }
.logo-mark {
  width: 32px; height: 32px;
  background: var(--teal);
  border-radius: 8px;
  display: flex; align-items: center; justify-content: center;
}
.logo-mark svg { width: 18px; height: 18px; }
.logo-text { font-family: var(--font-serif); font-size: 15px; font-weight: 700; color: var(--ink); letter-spacing: 0.02em; }
.logo-text span { font-family: var(--font-sans); font-size: 10px; font-weight: 500; color: var(--ink-faint); display: block; letter-spacing: 0.08em; text-transform: uppercase; }
.global-nav { display: flex; align-items: center; gap: 4px; }
.global-nav a { font-size: 13px; font-weight: 500; color: var(--ink-light); padding: 6px 12px; border-radius: var(--radius-sm); transition: color 0.15s, background 0.15s; white-space: nowrap; }
.global-nav a:hover, .global-nav a.active { color: var(--teal-deeper); background: var(--teal-light); }
.header-cta { font-size: 13px; font-weight: 600; color: var(--teal-deeper); border: 1.5px solid var(--teal); padding: 7px 16px; border-radius: 99px; transition: all 0.15s; white-space: nowrap; }
.header-cta:hover { background: var(--teal); color: var(--white); }

/* ===== BREADCRUMB ===== */
.breadcrumb {
  background: var(--surface);
  border-bottom: 1px solid var(--border-light);
  padding: 12px 24px;
}
.breadcrumb-inner {
  max-width: 1160px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  gap: 8px;
  flex-wrap: wrap;
}
.breadcrumb a, .breadcrumb span {
  font-size: 12px;
  color: var(--ink-faint);
}
.breadcrumb a:hover { color: var(--teal-deeper); }
.breadcrumb .sep { color: var(--border); }
.breadcrumb .current { color: var(--ink-light); }

/* ===== PAGE LAYOUT ===== */
.page-inner {
  max-width: 1160px;
  margin: 0 auto;
  padding: 0 24px 72px;
  display: grid;
  grid-template-columns: 1fr 300px;
  gap: 48px;
  align-items: start;
}
.main-col { min-width: 0; }
.side-col { position: sticky; top: 80px; }

/* ===== AEO ZONE ===== */
.aeo-zone {
  padding: 48px 0 56px;
}

/* 記事ヘッダー */
.article-header { margin-bottom: 36px; }
.article-cat-badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--teal-deeper);
  background: var(--teal-light);
  border: 1px solid var(--teal-mid);
  padding: 4px 12px;
  border-radius: 99px;
  margin-bottom: 16px;
}
.article-h1 {
  font-family: var(--font-serif);
  font-size: 28px;
  font-weight: 700;
  color: var(--ink);
  line-height: 1.5;
  letter-spacing: -0.01em;
  margin-bottom: 16px;
}
.article-meta-row {
  display: flex;
  align-items: center;
  gap: 16px;
  flex-wrap: wrap;
}
.article-date { font-size: 12px; color: var(--ink-faint); display: flex; align-items: center; gap: 5px; }
.article-source-badge {
  font-size: 11px;
  color: #5c4010;
  background: var(--accent-warm-light);
  border: 1px solid #f0d9b0;
  padding: 3px 10px;
  border-radius: 99px;
  display: flex; align-items: center; gap: 5px;
}

/* 定義文ブロック（AEO最重要） */
.definition-block {
  background: var(--teal-light);
  border-left: 4px solid var(--teal);
  border-radius: 0 var(--radius-md) var(--radius-md) 0;
  padding: 24px 28px;
  margin-bottom: 32px;
}
.definition-label {
  font-size: 10px;
  font-weight: 700;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--teal-deeper);
  margin-bottom: 10px;
  display: flex; align-items: center; gap: 6px;
}
.definition-label::before {
  content: '';
  width: 16px; height: 2px;
  background: var(--teal-deeper);
}
.definition-text {
  font-size: 16px;
  color: var(--ink);
  line-height: 1.85;
  font-weight: 500;
}

/* 要点サマリー */
.summary-block {
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 24px 28px;
  margin-bottom: 40px;
  background: var(--white);
}
.summary-title {
  font-size: 13px;
  font-weight: 700;
  color: var(--ink-light);
  letter-spacing: 0.08em;
  text-transform: uppercase;
  margin-bottom: 16px;
  display: flex; align-items: center; gap: 8px;
}
.summary-title::after { content: ''; flex: 1; height: 1px; background: var(--border); }
.summary-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 12px;
}
.summary-item {
  display: flex;
  gap: 10px;
  align-items: flex-start;
  padding: 12px;
  background: var(--surface);
  border-radius: var(--radius-md);
}
.summary-item-label {
  font-size: 11px;
  font-weight: 700;
  color: var(--teal-deeper);
  white-space: nowrap;
  min-width: 64px;
}
.summary-item-val {
  font-size: 13px;
  color: var(--ink);
  line-height: 1.6;
}

/* 本文 */
.article-body h2 {
  font-family: var(--font-serif);
  font-size: 20px;
  font-weight: 700;
  color: var(--ink);
  line-height: 1.5;
  margin: 44px 0 16px;
  padding-bottom: 12px;
  border-bottom: 2px solid var(--teal-light);
  position: relative;
}
.article-body h2::before {
  content: '';
  position: absolute;
  bottom: -2px; left: 0;
  width: 48px; height: 2px;
  background: var(--teal);
}
.article-body h3 {
  font-size: 16px;
  font-weight: 700;
  color: var(--ink);
  margin: 28px 0 10px;
  padding-left: 12px;
  border-left: 3px solid var(--teal);
}
.article-body p {
  font-size: 15px;
  color: var(--ink-mid);
  line-height: 1.95;
  margin-bottom: 18px;
}
.article-body ul {
  margin: 0 0 20px 0;
  padding: 0;
  list-style: none;
}
.article-body ul li {
  font-size: 14px;
  color: var(--ink-mid);
  padding: 8px 0 8px 20px;
  position: relative;
  border-bottom: 1px solid var(--border-light);
  line-height: 1.7;
}
.article-body ul li:last-child { border-bottom: none; }
.article-body ul li::before {
  content: '';
  position: absolute;
  left: 0; top: 17px;
  width: 8px; height: 8px;
  border-radius: 50%;
  background: var(--teal);
}

/* 比較テーブル */
.compare-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 14px;
  margin: 20px 0 28px;
  border-radius: var(--radius-md);
  overflow: hidden;
  border: 1px solid var(--border);
}
.compare-table th {
  background: var(--ink);
  color: var(--white);
  padding: 12px 16px;
  text-align: left;
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.04em;
}
.compare-table th:first-child { width: 30%; }
.compare-table td {
  padding: 12px 16px;
  border-bottom: 1px solid var(--border-light);
  color: var(--ink-mid);
  vertical-align: top;
}
.compare-table tr:last-child td { border-bottom: none; }
.compare-table tr:nth-child(even) td { background: var(--surface); }
.compare-table .highlight-row td { background: var(--teal-light); color: var(--ink); }
.compare-table .item-label { font-weight: 600; color: var(--ink); }

/* 参考文献 */
.references {
  margin-top: 40px;
  padding: 20px 24px;
  background: var(--surface);
  border-radius: var(--radius-md);
  border: 1px solid var(--border-light);
}
.references-title {
  font-size: 12px;
  font-weight: 700;
  color: var(--ink-faint);
  letter-spacing: 0.1em;
  text-transform: uppercase;
  margin-bottom: 12px;
}
.references ul { list-style: none; padding: 0; }
.references ul li {
  font-size: 12px;
  color: var(--ink-faint);
  padding: 5px 0;
  padding-left: 16px;
  position: relative;
  border: none;
}
.references ul li::before { content: '—'; position: absolute; left: 0; color: var(--border); }
.references ul li a { color: var(--teal-deeper); text-decoration: underline; text-decoration-color: var(--teal-mid); }

/* ===== AEO/商品 区切り ===== */
.zone-divider {
  margin: 0 0 0;
  border: none;
  border-top: 2px dashed var(--teal-mid);
  position: relative;
}
.zone-divider-label {
  text-align: center;
  padding: 16px 24px;
  background: linear-gradient(180deg, var(--surface) 0%, var(--white) 100%);
  margin-bottom: 0;
}
.zone-divider-label span {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--ink-faint);
}
.zone-divider-label span::before,
.zone-divider-label span::after {
  content: '';
  width: 32px; height: 1px;
  background: var(--border);
}

/* ===== 商品ゾーン ===== */
.product-zone {
  padding: 40px 0 64px;
}
.product-zone-header {
  margin-bottom: 28px;
}
.product-label {
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--teal-deeper);
  margin-bottom: 8px;
  display: flex; align-items: center; gap: 8px;
}
.product-label::after { content: ''; flex: 1; max-width: 40px; height: 1px; background: var(--teal); }
.product-name {
  font-family: var(--font-serif);
  font-size: 22px;
  font-weight: 700;
  color: var(--ink);
  margin-bottom: 8px;
}
.product-sub { font-size: 13px; color: var(--ink-light); }

/* 商品スペック */
.product-spec {
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  overflow: hidden;
  margin-bottom: 28px;
}
.product-spec table { width: 100%; border-collapse: collapse; font-size: 13px; }
.product-spec td {
  padding: 12px 16px;
  border-bottom: 1px solid var(--border-light);
  vertical-align: top;
}
.product-spec tr:last-child td { border-bottom: none; }
.product-spec .spec-label {
  width: 36%;
  font-weight: 600;
  color: var(--ink-light);
  background: var(--surface);
  font-size: 12px;
}
.product-spec .spec-val { color: var(--ink); }

/* 価格テーブル */
.price-section { margin-bottom: 32px; }
.price-section-title {
  font-size: 14px;
  font-weight: 700;
  color: var(--ink);
  margin-bottom: 14px;
  display: flex; align-items: center; gap: 8px;
}
.price-section-title::before {
  content: '';
  width: 4px; height: 16px;
  background: var(--teal);
  border-radius: 2px;
}
.price-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 14px;
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  overflow: hidden;
}
.price-table th {
  background: var(--surface-2);
  padding: 11px 16px;
  text-align: center;
  font-size: 12px;
  font-weight: 600;
  color: var(--ink-light);
  border-bottom: 1px solid var(--border);
}
.price-table td {
  padding: 13px 16px;
  text-align: center;
  border-bottom: 1px solid var(--border-light);
  color: var(--ink-mid);
}
.price-table tr:last-child td { border-bottom: none; }
.price-table .recommended td { background: var(--teal-light); }
.price-table .price-val { font-weight: 700; font-size: 16px; color: var(--ink); }
.price-table .unit-price { font-size: 12px; color: var(--ink-faint); }
.recommended-badge {
  display: inline-block;
  font-size: 10px;
  font-weight: 700;
  color: var(--teal-deeper);
  background: var(--teal);
  padding: 2px 8px;
  border-radius: 99px;
  margin-left: 6px;
}
.price-note {
  font-size: 11px;
  color: var(--ink-faint);
  margin-top: 8px;
  line-height: 1.7;
}

/* CTAボタン */
.cta-block {
  margin: 28px 0;
}
.cta-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  width: 100%;
  background: var(--teal);
  color: var(--ink);
  font-size: 16px;
  font-weight: 700;
  padding: 18px 32px;
  border-radius: var(--radius-lg);
  transition: all 0.15s;
  letter-spacing: 0.02em;
}
.cta-btn:hover {
  background: var(--teal-dark);
  transform: translateY(-1px);
  box-shadow: 0 6px 24px rgba(101,225,234,0.35);
}
.cta-btn svg { flex-shrink: 0; }
.cta-sub {
  text-align: center;
  font-size: 12px;
  color: var(--ink-faint);
  margin-top: 10px;
}

/* FAQ */
.faq-section { margin-top: 48px; }
.faq-title {
  font-family: var(--font-serif);
  font-size: 20px;
  font-weight: 700;
  color: var(--ink);
  margin-bottom: 24px;
  display: flex; align-items: center; gap: 12px;
}
.faq-title::after { content: ''; flex: 1; height: 1px; background: var(--border); }
.faq-item {
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  margin-bottom: 12px;
  overflow: hidden;
}
.faq-q {
  padding: 18px 20px;
  font-size: 14px;
  font-weight: 700;
  color: var(--ink);
  background: var(--white);
  display: flex;
  align-items: flex-start;
  gap: 12px;
  cursor: pointer;
}
.faq-q-icon {
  width: 24px; height: 24px;
  border-radius: 50%;
  background: var(--teal);
  color: var(--ink);
  font-size: 13px;
  font-weight: 700;
  display: flex; align-items: center; justify-content: center;
  flex-shrink: 0;
  margin-top: 1px;
}
.faq-a {
  padding: 0 20px 18px 56px;
  font-size: 14px;
  color: var(--ink-mid);
  line-height: 1.85;
  background: var(--surface);
  border-top: 1px solid var(--border-light);
}
.faq-a-icon {
  color: var(--teal-deeper);
  font-weight: 700;
  font-size: 13px;
}

/* 注意・免責 */
.disclaimer-block {
  background: var(--accent-warm-light);
  border: 1px solid #f0d9b0;
  border-radius: var(--radius-md);
  padding: 20px 24px;
  margin: 36px 0;
  display: flex;
  gap: 12px;
  align-items: flex-start;
}
.disclaimer-icon { color: var(--accent-warm); flex-shrink: 0; margin-top: 2px; }
.disclaimer-text { font-size: 12px; color: #7a5c2e; line-height: 1.8; }
.disclaimer-text strong { font-weight: 700; color: #5c4010; }

/* 関連記事 */
.related-section { margin-top: 48px; margin-bottom: 72px; }
.related-title {
  font-size: 14px;
  font-weight: 700;
  color: var(--ink-light);
  letter-spacing: 0.08em;
  text-transform: uppercase;
  margin-bottom: 16px;
  display: flex; align-items: center; gap: 8px;
}
.related-title::after { content: ''; flex: 1; height: 1px; background: var(--border); }
.related-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 12px;
}
.related-card {
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: 14px 16px;
  font-size: 13px;
  color: var(--ink);
  display: flex;
  align-items: center;
  gap: 10px;
  transition: all 0.15s;
}
.related-card:hover {
  border-color: var(--teal-mid);
  background: var(--teal-light);
  color: var(--teal-deeper);
}
.related-card svg { flex-shrink: 0; color: var(--teal-deeper); }

/* ===== サイドバー ===== */
.side-toc {
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  overflow: hidden;
  margin-bottom: 20px;
}
.side-toc-header {
  background: var(--ink);
  padding: 14px 18px;
  font-size: 12px;
  font-weight: 700;
  color: var(--white);
  letter-spacing: 0.08em;
  text-transform: uppercase;
}
.side-toc-list { list-style: none; padding: 12px 0; }
.side-toc-list li a {
  display: block;
  padding: 8px 18px;
  font-size: 13px;
  color: var(--ink-light);
  transition: color 0.15s, background 0.15s;
}
.side-toc-list li a:hover { color: var(--teal-deeper); background: var(--teal-light); }
.side-toc-list li a::before { content: '— '; color: var(--border); }

.side-cta-card {
  border: 2px solid var(--teal);
  border-radius: var(--radius-lg);
  padding: 24px 20px;
  text-align: center;
  background: var(--teal-light);
}
.side-cta-label {
  font-size: 11px;
  font-weight: 700;
  color: var(--teal-deeper);
  letter-spacing: 0.1em;
  text-transform: uppercase;
  margin-bottom: 10px;
}
.side-cta-product {
  font-family: var(--font-serif);
  font-size: 16px;
  font-weight: 700;
  color: var(--ink);
  margin-bottom: 6px;
}
.side-cta-price {
  font-size: 13px;
  color: var(--ink-light);
  margin-bottom: 16px;
}
.side-cta-btn {
  display: block;
  background: var(--teal);
  color: var(--ink);
  font-size: 13px;
  font-weight: 700;
  padding: 12px 16px;
  border-radius: 99px;
  transition: all 0.15s;
}
.side-cta-btn:hover { background: var(--teal-dark); }
.side-cta-note {
  font-size: 11px;
  color: var(--ink-faint);
  margin-top: 8px;
}

/* ===== FOOTER（TOPと同一） ===== */
.site-footer {
  background: var(--ink-mid);
  color: rgba(255,255,255,0.7);
  padding: 48px 24px 32px;
}
.footer-inner { max-width: 1160px; margin: 0 auto; }
.footer-top {
  display: grid;
  grid-template-columns: 1.5fr 1fr 1fr 1fr;
  gap: 40px;
  padding-bottom: 40px;
  border-bottom: 1px solid rgba(255,255,255,0.08);
  margin-bottom: 28px;
}
.footer-brand .logo-text { color: var(--white); }
.footer-brand .logo-text span { color: rgba(255,255,255,0.35); }
.footer-tagline { font-size: 12px; color: rgba(255,255,255,0.4); margin-top: 12px; line-height: 1.7; }
.footer-col-title { font-size: 11px; font-weight: 700; letter-spacing: 0.1em; text-transform: uppercase; color: rgba(255,255,255,0.35); margin-bottom: 14px; }
.footer-links { list-style: none; display: flex; flex-direction: column; gap: 9px; }
.footer-links a { font-size: 13px; color: rgba(255,255,255,0.55); transition: color 0.15s; }
.footer-links a:hover { color: var(--teal); }
.footer-bottom { display: flex; align-items: center; justify-content: space-between; flex-wrap: wrap; gap: 12px; }
.footer-copy { font-size: 11px; color: rgba(255,255,255,0.25); }
.footer-legal { display: flex; gap: 20px; }
.footer-legal a { font-size: 11px; color: rgba(255,255,255,0.3); transition: color 0.15s; }
.footer-legal a:hover { color: rgba(255,255,255,0.7); }

/* ===== RESPONSIVE ===== */
@media (max-width: 900px) {
  .page-inner { grid-template-columns: 1fr; gap: 32px; }
  .side-col { position: static; }
  .summary-grid { grid-template-columns: 1fr; }
  .related-grid { grid-template-columns: 1fr; }
  .global-nav { display: none; }
  .footer-top { grid-template-columns: 1fr 1fr; gap: 28px; }
}
@media (max-width: 600px) {
  .article-h1 { font-size: 22px; }
  .price-table th, .price-table td { padding: 10px 10px; font-size: 13px; }
  .footer-top { grid-template-columns: 1fr; }
}