@import url('https://fonts.googleapis.com/css2?family=Noto+Serif+JP:wght@400;600;700&family=Noto+Sans+JP:wght@300;400;500&display=swap');

  :root {
    --bg: #faf8f4;
    --text: #1a1714;
    --muted: #6b6460;
    --accent: #b5470a;
    --accent-light: #f5ede6;
    --border: #e0dbd4;
    --serif: 'Noto Serif JP', serif;
    --sans: 'Noto Sans JP', sans-serif;
    --white: #ffffff;  /* ← これを追加 */
  }

  * { margin: 0; padding: 0; box-sizing: border-box; }

  body {
    background: var(--bg);
    color: var(--text);
    font-family: var(--sans);
    font-weight: 400;
    line-height: 1.9;
    font-size: 15px;
  }

  /* Header */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: var(--white);
  border-bottom: 1px solid var(--border);
}
.header-inner {
  max-width: 1100px;
  margin: 0 auto;
  padding: 0 32px;
  height: 58px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  }
.header-inner a {
  color: inherit; 
  text-decoration: none;
}
}
.logo {
  display: flex;
  flex-direction: column;
  gap: 1px;
}
.logo-en {
  font-size: 10px;
  letter-spacing: .22em;
  color: var(--accent);
  text-transform: uppercase;
  font-weight: 500;
}
.logo-ja {
  font-family: var(--serif);
  font-size: 16px;
  font-weight: 700;
  color: var(--text);
  letter-spacing: .05em;
  line-height: 1;
}
.header-nav {
  display: flex;
  gap: 28px;
  align-items: center;
}
.header-nav a {
  font-size: 12.5px;
  color: var(--muted);
  letter-spacing: .05em;
  transition: color .2s;
}
.header-nav a:hover { color: var(--accent); }
.header-nav .cta {
  background: var(--accent);
  color: var(--white);
  padding: 7px 16px;
  border-radius: 2px;
  font-size: 12px;
  font-weight: 500;
  letter-spacing: .06em;
  transition: opacity .2s;
}
.header-nav .cta:hover { opacity: .85; color: var(--white); }


/* ─── TOPIC BAND ─── */
.topic-band {
  background: var(--text);
  padding: 0;
  overflow: hidden;
}
.topic-band-inner {
  max-width: 1100px;
  margin: 0 auto;
  padding: 0 32px;
  display: flex;
  align-items: stretch;
}
.topic-band-label {
  background: var(--accent);
  color: var(--white);
  font-size: 10.5px;
  letter-spacing: .18em;
  text-transform: uppercase;
  font-weight: 500;
  padding: 0 22px;
  display: flex;
  align-items: center;
  white-space: nowrap;
  flex-shrink: 0;
}
.topic-list {
  display: flex;
  gap: 0;
  overflow: hidden;
}
.topic-item {
  border-right: 1px solid rgba(255,255,255,.1);
  padding: 13px 22px;
}
.topic-item a {
  font-size: 12px;
  color: rgba(255,255,255,.75);
  letter-spacing: .05em;
  white-space: nowrap;
  transition: color .2s;
}
.topic-item a:hover { color: var(--white); }


  /* Hero */
  .hero {
    background: #fff;
    border-bottom: 3px solid var(--accent);
    padding: 60px 24px 48px;
  }
  .hero-inner {
    max-width: 1020px;
    margin: 0 auto;
  }
  .hero-category {
    font-family: var(--sans);
    font-size: 11px;
    letter-spacing: .16em;
    color: var(--accent);
    text-transform: uppercase;
    margin-bottom: 18px;
    display: flex;
    align-items: center;
    gap: 8px;
  }
  .hero-category::before {
    content: '';
    display: inline-block;
    width: 20px;
    height: 1px;
    background: var(--accent);
  }
  .hero h1 {
    font-family: var(--serif);
    font-size: clamp(22px, 3.5vw, 34px);
    font-weight: 700;
    line-height: 1.55;
    color: var(--text);
    margin-bottom: 20px;
    letter-spacing: .02em;
  }
  .hero-lead {
    font-size: 15px;
    color: var(--muted);
    max-width: 1020px;
    line-height: 2;
  }
  .hero-meta {
    margin-top: 28px;
    font-size: 12px;
    color: #aaa;
    letter-spacing: .05em;
  }

  /* Main layout */
  .main-layout {
    max-width: 1100px;
    margin: 0 auto;
    padding: 52px 32px 80px;
    display: grid;
    grid-template-columns: 1fr 260px;
    gap: 52px;
    align-items: start;
  }
  @media (max-width: 700px) {
    .main-layout { grid-template-columns: 1fr; gap: 40px; }
  }

  /* Article body */
  .article-body h2 {
    font-family: var(--serif);
    font-size: 20px;
    font-weight: 700;
    color: var(--text);
    margin: 48px 0 16px;
    padding-bottom: 10px;
    border-bottom: 2px solid var(--text);
    letter-spacing: .03em;
    line-height: 1.5;
  }
  .article-body h2:first-child { margin-top: 0; }

  .article-body h3 {
    font-family: var(--serif);
    font-size: 16px;
    font-weight: 600;
    color: var(--text);
    margin: 32px 0 12px;
    padding-left: 12px;
    border-left: 3px solid var(--accent);
    line-height: 1.6;
  }

  .article-body p {
    margin-bottom: 20px;
    color: #2e2a26;
    line-height: 2;
  }

  .article-body a {
    color: var(--accent);
    text-decoration: underline;
    text-underline-offset: 3px;
  }
  .article-body a:hover { opacity: .75; }

  /* Check list */
  .check-list {
    list-style: none;
    background: var(--accent-light);
    border-radius: 4px;
    padding: 22px 24px;
    margin: 24px 0;
  }
  .check-list li {
    padding: 7px 0 7px 28px;
    position: relative;
    font-size: 14px;
    color: #2e2a26;
    border-bottom: 1px solid rgba(181,71,10,.12);
    line-height: 1.75;
  }
  .check-list li:last-child { border-bottom: none; }
  .check-list li::before {
    content: '✓';
    position: absolute;
    left: 0;
    color: var(--accent);
    font-weight: 700;
    font-size: 13px;
  }

  /* Callout box */
  .callout {
    background: #fff;
    border: 1px solid var(--border);
    border-left: 4px solid var(--accent);
    border-radius: 0 4px 4px 0;
    padding: 20px 22px;
    margin: 28px 0;
    font-size: 14px;
    line-height: 1.85;
    color: #3a3530;
  }
  .callout strong {
    display: block;
    font-family: var(--serif);
    font-size: 15px;
    margin-bottom: 8px;
    color: var(--text);
  }

  /* Site introduction card — the key element */
  .site-card {
    background: #fff;
    border: 1.5px solid var(--border);
    border-radius: 6px;
    padding: 28px 28px 24px;
    margin: 36px 0;
    position: relative;
    overflow: hidden;
  }
  .site-card::before {
    content: '';
    position: absolute;
    top: 0; left: 0; right: 0;
    height: 4px;
    background: linear-gradient(90deg, var(--accent), #e07a40);
  }
  .site-card-label {
    font-size: 11px;
    letter-spacing: .14em;
    color: var(--accent);
    text-transform: uppercase;
    margin-bottom: 10px;
    font-weight: 500;
  }
  .site-card h4 {
    font-family: var(--serif);
    font-size: 17px;
    font-weight: 700;
    margin-bottom: 12px;
    color: var(--text);
    line-height: 1.5;
  }
  .site-card p {
    font-size: 13.5px;
    color: var(--muted);
    line-height: 1.85;
    margin-bottom: 18px;
  }
  .site-card-link {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    background: var(--accent);
    color: #fff !important;
    text-decoration: none !important;
    font-size: 13px;
    font-weight: 500;
    padding: 9px 18px;
    border-radius: 3px;
    letter-spacing: .04em;
    transition: opacity .2s;
  }
  .site-card-link:hover { opacity: .85; }
  .site-card-link::after { content: '→'; }

  /* Table */
  .comparison-table {
    width: 100%;
    border-collapse: collapse;
    margin: 24px 0;
    font-size: 13.5px;
  }
  .comparison-table th {
    background: var(--text);
    color: #fff;
    padding: 10px 14px;
    text-align: left;
    font-family: var(--sans);
    font-weight: 500;
    letter-spacing: .04em;
  }
  .comparison-table td {
    padding: 11px 14px;
    border-bottom: 1px solid var(--border);
    vertical-align: top;
    line-height: 1.75;
  }
  .comparison-table tr:nth-child(even) td { background: #f7f4f0; }

  /* Divider */
  .section-divider {
    border: none;
    border-top: 1px solid var(--border);
    margin: 48px 0;
  }

  /* Sidebar */
  .sidebar { position: sticky; top: 32px; }

  .toc-box {
    background: #fff;
    border: 1px solid var(--border);
    border-radius: 4px;
    padding: 22px;
    margin-bottom: 28px;
  }
  .toc-box h5 {
    font-family: var(--serif);
    font-size: 13px;
    color: var(--muted);
    letter-spacing: .1em;
    margin-bottom: 14px;
    padding-bottom: 10px;
    border-bottom: 1px solid var(--border);
  }
  .toc-box ol {
    list-style: none;
    counter-reset: toc;
  }
  .toc-box ol li {
    counter-increment: toc;
    font-size: 12.5px;
    padding: 6px 0 6px 22px;
    border-bottom: 1px solid #f0ece6;
    position: relative;
    line-height: 1.6;
    color: var(--text);
  }
  .toc-box ol li::before {
    content: counter(toc);
    position: absolute;
    left: 0;
    color: var(--accent);
    font-weight: 700;
    font-size: 11px;
    top: 8px;
  }
  .toc-box ol li:last-child { border-bottom: none; }
  .toc-box ol li a {
    color: inherit;
    text-decoration: none;
  }
  .toc-box ol li a:hover { color: var(--accent); }

  .sidebar-note {
    background: var(--accent-light);
    border-radius: 4px;
    padding: 18px;
    font-size: 12.5px;
    color: #4a3328;
    line-height: 1.85;
  }
  .sidebar-note strong {
    display: block;
    font-family: var(--serif);
    margin-bottom: 8px;
    font-size: 13px;
    color: var(--accent);
  }

  /* Footer */
  .article-footer {
    max-width: 1100px;
    margin: 0 auto;
    padding: 0 32px 60px;
    border-top: 1px solid var(--border);
    padding-top: 32px;
    font-size: 12px;
    color: #aaa;
    line-height: 1.9;
  }