/* ============================================================
   blog.css — SEO記事用ライトテーマ（landing-theme.cssと統一）
   ============================================================ */
@import url('https://fonts.googleapis.com/css2?family=Caveat:wght@400;600;700&family=Noto+Sans+JP:wght@400;500;700&display=swap');

:root {
  --bg: #C8E6F0;
  --card: #ffffff;
  --text: #1a1a1a;
  --text-sub: #4a4a4a;
  --text-muted: #777;
  --cta: #4CAF50;
  --cta-hover: #388E3C;
  --link: #2E7D32;
  --border: rgba(0,0,0,0.08);
}

* { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body {
  font-family: 'Noto Sans JP', sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.85;
  font-size: 16px;
}

/* ── Nav ── */
.blog-nav {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 16px 24px;
  background: rgba(255,255,255,0.85);
  backdrop-filter: blur(8px);
  position: sticky;
  top: 0;
  z-index: 50;
  border-bottom: 1px solid var(--border);
}
.blog-nav-logo {
  font-weight: 700;
  font-size: 1.1rem;
  color: var(--text);
  text-decoration: none;
}
.blog-nav-cta {
  background: var(--cta);
  color: #fff;
  padding: 8px 20px;
  border-radius: 50px;
  text-decoration: none;
  font-weight: 700;
  font-size: 0.9rem;
  transition: background 0.2s;
}
.blog-nav-cta:hover { background: var(--cta-hover); }

/* ── Article ── */
.blog-article {
  max-width: 760px;
  margin: 40px auto;
  background: var(--card);
  padding: clamp(28px, 5vw, 64px) clamp(20px, 5vw, 56px);
  border-radius: 20px;
  box-shadow: 0 4px 24px rgba(0,0,0,0.06);
}
.blog-eyebrow {
  display: inline-block;
  font-family: 'Caveat', cursive;
  font-size: 1.6rem;
  color: var(--cta);
  margin-bottom: 8px;
}
.blog-title {
  font-size: clamp(1.6rem, 3.5vw, 2.4rem);
  font-weight: 700;
  line-height: 1.4;
  margin-bottom: 16px;
  letter-spacing: -0.01em;
}
.blog-meta {
  font-size: 0.85rem;
  color: var(--text-muted);
  margin-bottom: 32px;
  padding-bottom: 20px;
  border-bottom: 1px solid var(--border);
}
.blog-meta-tag {
  display: inline-block;
  background: rgba(76,175,80,0.1);
  color: var(--cta);
  padding: 2px 10px;
  border-radius: 12px;
  font-size: 0.78rem;
  margin-right: 8px;
}

.blog-article h2 {
  font-size: 1.4rem;
  font-weight: 700;
  margin: 40px 0 16px;
  padding-bottom: 8px;
  border-bottom: 2px solid var(--cta);
  color: var(--text);
}
.blog-article h3 {
  font-size: 1.15rem;
  font-weight: 700;
  margin: 28px 0 12px;
  color: var(--text-sub);
}
.blog-article p {
  margin-bottom: 18px;
  color: var(--text-sub);
}
.blog-article ul, .blog-article ol {
  margin: 0 0 20px 24px;
  color: var(--text-sub);
}
.blog-article li { margin-bottom: 8px; }
.blog-article strong { color: var(--text); font-weight: 700; }
.blog-article a {
  color: var(--link);
  text-decoration: underline;
  text-decoration-thickness: 1px;
  text-underline-offset: 3px;
}
.blog-article a:hover { color: var(--cta-hover); }

.blog-callout {
  background: rgba(76,175,80,0.08);
  border-left: 4px solid var(--cta);
  padding: 18px 22px;
  margin: 24px 0;
  border-radius: 8px;
}
.blog-callout p:last-child { margin-bottom: 0; }

.blog-table {
  width: 100%;
  border-collapse: collapse;
  margin: 20px 0;
  font-size: 0.92rem;
}
.blog-table th, .blog-table td {
  padding: 10px 14px;
  border: 1px solid var(--border);
  text-align: left;
}
.blog-table th {
  background: rgba(76,175,80,0.08);
  font-weight: 700;
}

/* ── CTA Section ── */
.blog-cta-section {
  margin-top: 48px;
  padding: 32px;
  background: linear-gradient(135deg, #4CAF50 0%, #388E3C 100%);
  border-radius: 16px;
  text-align: center;
  color: #fff;
}
.blog-cta-section h3 {
  color: #fff;
  font-size: 1.3rem;
  margin-bottom: 12px;
}
.blog-cta-section p {
  color: rgba(255,255,255,0.92);
  margin-bottom: 20px;
}
.blog-cta-btn {
  display: inline-block;
  background: #fff;
  color: var(--cta);
  padding: 12px 28px;
  border-radius: 50px;
  font-weight: 700;
  text-decoration: none;
  transition: transform 0.2s;
}
.blog-cta-btn:hover { transform: translateY(-2px); }

/* ── Related ── */
.blog-related {
  margin-top: 32px;
  padding: 20px;
  background: rgba(76,175,80,0.06);
  border-radius: 12px;
}
.blog-related h4 {
  font-size: 0.85rem;
  color: var(--text-muted);
  margin-bottom: 10px;
  letter-spacing: 0.08em;
}
.blog-related a {
  display: block;
  padding: 6px 0;
  color: var(--link);
  font-size: 0.95rem;
}

/* ── Footer ── */
.blog-footer {
  text-align: center;
  padding: 32px 16px;
  color: var(--text-muted);
  font-size: 0.85rem;
}
.blog-footer a { color: var(--link); margin: 0 8px; }

/* ── Blog Index Cards ── */
.blog-index-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 20px;
  margin: 40px auto;
  max-width: 1100px;
  padding: 0 20px;
}
.blog-card {
  background: var(--card);
  border-radius: 16px;
  padding: 24px;
  text-decoration: none;
  color: var(--text);
  transition: transform 0.2s, box-shadow 0.2s;
  box-shadow: 0 2px 12px rgba(0,0,0,0.04);
}
.blog-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 8px 24px rgba(0,0,0,0.1);
}
.blog-card-tag {
  display: inline-block;
  background: rgba(76,175,80,0.1);
  color: var(--cta);
  padding: 3px 10px;
  border-radius: 12px;
  font-size: 0.75rem;
  margin-bottom: 12px;
}
.blog-card-title {
  font-size: 1.05rem;
  font-weight: 700;
  margin-bottom: 8px;
  line-height: 1.5;
}
.blog-card-desc {
  font-size: 0.88rem;
  color: var(--text-muted);
}