:root {
  --black:      #0f0f0f;
  --black-mid:  #1a1a1a;
  --white:      #ffffff;
  --cream:      #faf8f4;
  --gray-light: #f4f2ee;
  --gray-mid:   #888888;
  --gray-text:  #444444;
  --body-text:  #2a2a2a;
  --gold:       #c9a55a;
  --gold-light: #e2c47a;
  --gold-dark:  #a07830;
  --border:     rgba(201,165,90,0.25);
  --border-gray: rgba(0,0,0,0.08);
  --font-serif: 'Cormorant Garamond', 'Noto Serif JP', serif;
  --font-sans:  'Noto Sans JP', sans-serif;
}

*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }

body {
  background: var(--white);
  color: var(--body-text);
  font-family: var(--font-sans);
  font-weight: 300;
  line-height: 1.9;
  overflow-x: hidden;
}

/* ── Header ── */
.site-header {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 100;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 18px 40px;
  background: rgba(255,255,255,0.96);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border-gray);
}
.site-header .logo {
  font-family: var(--font-serif);
  font-size: 1rem;
  letter-spacing: 0.18em;
  color: var(--black);
  text-decoration: none;
  font-weight: 400;
}
.site-header .header-cta {
  font-size: 0.72rem;
  letter-spacing: 0.12em;
  color: var(--black);
  border: 1px solid rgba(0,0,0,0.25);
  padding: 8px 20px;
  text-decoration: none;
  transition: all 0.3s;
}
.site-header .header-cta:hover {
  background: var(--gold);
  color: var(--white);
  border-color: var(--gold);
}

/* ── Hero ── */
.article-hero {
  position: relative;
  width: 100%;
  height: 460px;
  overflow: hidden;
  margin-top: 60px;
}
.article-hero img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  filter: brightness(0.42);
}
.article-hero-overlay {
  position: absolute;
  inset: 0;
  display: flex;
  flex-direction: column;
  justify-content: flex-end;
  padding: 56px 48px;
  background: linear-gradient(to top, rgba(10,10,10,0.75) 0%, transparent 55%);
}
.article-category {
  display: inline-block;
  font-size: 0.68rem;
  letter-spacing: 0.22em;
  color: var(--gold);
  border: 1px solid rgba(201,165,90,0.5);
  padding: 4px 14px;
  margin-bottom: 18px;
  text-transform: uppercase;
}
.article-hero h1 {
  font-family: var(--font-serif);
  font-size: clamp(1.5rem, 3.5vw, 2.4rem);
  font-weight: 400;
  line-height: 1.45;
  color: #ffffff;
  max-width: 700px;
  letter-spacing: 0.02em;
}

/* ── Layout ── */
.article-wrap {
  max-width: 780px;
  margin: 0 auto;
  padding: 72px 24px 104px;
}

/* ── Lead ── */
.article-lead {
  font-size: 1rem;
  line-height: 2;
  color: var(--gray-text);
  border-left: 2px solid var(--gold);
  padding-left: 22px;
  margin-bottom: 64px;
}

/* ── Body text ── */
.article-body h2 {
  font-family: var(--font-serif);
  font-size: clamp(1.25rem, 2.8vw, 1.7rem);
  font-weight: 400;
  color: var(--black);
  letter-spacing: 0.04em;
  margin: 64px 0 18px;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--border);
}
.article-body h3 {
  font-size: 0.95rem;
  font-weight: 500;
  color: var(--black-mid);
  letter-spacing: 0.06em;
  margin: 36px 0 10px;
}
.article-body p {
  margin-bottom: 20px;
  font-size: 0.94rem;
  color: var(--body-text);
  line-height: 1.95;
}
.article-body strong {
  color: var(--black);
  font-weight: 500;
}
.article-body ul, .article-body ol {
  margin: 0 0 20px 22px;
  font-size: 0.94rem;
}
.article-body li { margin-bottom: 8px; color: var(--body-text); }
.article-body hr {
  border: none;
  border-top: 1px solid var(--border-gray);
  margin: 48px 0;
}

/* ── In-article image ── */
.article-body .article-img {
  width: 100%;
  height: 300px;
  object-fit: cover;
  border-radius: 2px;
  margin: 36px 0;
}

/* ── Diagram wrapper ── */
.diagram-wrap {
  margin: 48px 0;
  background: var(--cream);
  border: 1px solid var(--border);
  padding: 40px 32px;
  border-radius: 2px;
}
.diagram-label {
  font-size: 0.7rem;
  letter-spacing: 0.2em;
  color: var(--gold-dark);
  text-transform: uppercase;
  margin-bottom: 28px;
  display: block;
}

/* ── Comparison table ── */
.compare-table-wrap {
  margin: 48px 0;
  overflow-x: auto;
}
.compare-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.84rem;
  font-family: var(--font-sans);
}
.compare-table th {
  background: var(--black);
  color: var(--white);
  padding: 14px 16px;
  font-weight: 400;
  letter-spacing: 0.06em;
  text-align: center;
  border: 1px solid rgba(255,255,255,0.08);
  font-size: 0.8rem;
}
.compare-table th.axis-col {
  background: var(--gold);
  color: var(--white);
}
.compare-table td {
  border: 1px solid var(--border-gray);
  padding: 14px 16px;
  text-align: center;
  vertical-align: middle;
  color: var(--body-text);
  background: var(--white);
}
.compare-table td.row-header {
  text-align: left;
  font-weight: 400;
  color: var(--black);
  background: var(--cream);
  padding-left: 20px;
}
.compare-table td.axis-val {
  background: #fdf8ef;
  color: var(--gold-dark);
  font-weight: 500;
}
.compare-table tr:hover td { background: var(--gray-light); }
.compare-table tr:hover td.axis-val { background: #fdf0d8; }
.icon-yes  { color: var(--gold-dark); font-size: 1.1rem; }
.icon-part { color: var(--gray-mid); font-size: 1.1rem; }
.icon-no   { color: #ccc; font-size: 1.1rem; }

/* ── CTA Box ── */
.cta-box {
  background: var(--cream);
  border: 1px solid var(--border);
  border-left: 3px solid var(--gold);
  padding: 40px 36px;
  margin: 56px 0;
}
.cta-title {
  font-family: var(--font-serif);
  font-size: 1.15rem;
  font-weight: 400;
  color: var(--gold-dark);
  letter-spacing: 0.06em;
  margin-bottom: 14px;
}
.cta-box p {
  font-size: 0.88rem;
  color: var(--gray-text);
  line-height: 1.9;
  margin-bottom: 0;
}
.cta-btn {
  display: block;
  margin-top: 24px;
  text-align: center;
  background: var(--black);
  color: var(--white);
  font-size: 0.82rem;
  font-weight: 400;
  letter-spacing: 0.14em;
  padding: 18px 32px;
  text-decoration: none;
  transition: background 0.3s;
}
.cta-btn:hover { background: var(--gold); }

/* ── FAQ ── */
.faq-section {
  margin-top: 80px;
  padding-top: 48px;
  border-top: 1px solid var(--border-gray);
}
.faq-section h2 {
  font-family: var(--font-serif);
  font-size: 1.4rem;
  font-weight: 400;
  color: var(--black);
  margin-bottom: 32px;
  letter-spacing: 0.06em;
}
.faq-item {
  border-bottom: 1px solid var(--border-gray);
  padding: 24px 0;
}
.faq-q {
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--black);
  margin-bottom: 10px;
}
.faq-a {
  font-size: 0.87rem;
  color: var(--gray-text);
  line-height: 1.9;
}

/* ── Related ── */
.related-section {
  margin-top: 80px;
  padding-top: 48px;
  border-top: 1px solid var(--border-gray);
}
.related-section h2 {
  font-family: var(--font-serif);
  font-size: 1.3rem;
  font-weight: 400;
  color: var(--black);
  margin-bottom: 24px;
  letter-spacing: 0.06em;
}
.related-list { list-style: none; margin: 0; padding: 0; }
.related-list li { margin-bottom: 12px; }
.related-list a {
  color: var(--gray-text);
  font-size: 0.88rem;
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color 0.2s, border-color 0.2s;
}
.related-list a:hover { color: var(--gold-dark); border-bottom-color: var(--border); }
.related-list a::before { content: "→  "; color: var(--gold); }

/* ── Footer ── */
.site-footer {
  text-align: center;
  padding: 52px 24px;
  background: var(--black);
  font-size: 0.78rem;
  color: rgba(255,255,255,0.4);
  letter-spacing: 0.1em;
}
.site-footer a { color: var(--gold); text-decoration: none; }

/* ── Responsive ── */
@media (max-width: 640px) {
  .site-header { padding: 14px 20px; }
  .article-hero { height: 340px; }
  .article-hero-overlay { padding: 32px 22px; }
  .article-wrap { padding: 48px 20px 80px; }
  .cta-box { padding: 28px 20px; }
  .diagram-wrap { padding: 28px 20px; }
}