/* Notion Design System - water-environmental-analysis blog */
:root {
  --blog-font-sans: 'Inter', system-ui, -apple-system, BlinkMacSystemFont, 'Noto Sans JP', sans-serif;
  --blog-bg: #f8fafc;
  --blog-surface: #ffffff;
  --blog-soft: #eef9fb;
  --blog-text: #0f172a;
  --blog-muted: #475569;
  --blog-subtle: #64748b;
  --blog-border: rgba(15, 23, 42, 0.1);
  --blog-border-strong: rgba(6, 182, 212, 0.32);
  --blog-accent: #0369a1;
  --blog-accent-2: #059669;
  --blog-cyan: #06b6d4;
  --blog-shadow: 0 18px 45px rgba(3, 105, 161, 0.12);
  --blog-radius: 8px;
}

body { font-family: var(--blog-font-sans); }
.skip-link { position: absolute; top: -48px; left: 16px; z-index: 10000; padding: 10px 14px; border-radius: var(--blog-radius); background: var(--blog-cyan); color: white; font-weight: 800; }
.skip-link:focus { top: 16px; }
.blog-main { padding: 112px 20px 88px; background: radial-gradient(circle at 12% 0%, rgba(6, 182, 212, 0.16), transparent 32rem), radial-gradient(circle at 92% 16%, rgba(5, 150, 105, 0.14), transparent 28rem), var(--blog-bg); color: var(--blog-text); }
.blog-hero { max-width: 1180px; margin: 0 auto 28px; padding: clamp(34px, 6vw, 66px); border: 1px solid var(--blog-border); border-radius: 16px; background: linear-gradient(135deg, rgba(255,255,255,0.96), rgba(238,249,251,0.9)); box-shadow: var(--blog-shadow); }
.eyebrow { display: inline-flex; margin-bottom: 12px; color: var(--blog-accent-2); font-size: .78rem; font-weight: 800; letter-spacing: .12em; text-transform: uppercase; }
.blog-hero h1, .article-header h1 { max-width: 860px; margin: 0 0 16px; color: var(--blog-text); font-size: clamp(2rem, 5vw, 3.8rem); line-height: 1.1; letter-spacing: -.04em; }
.blog-hero p, .blog-card p, .post-meta, .sidebar-card small { color: var(--blog-muted); }
.blog-layout { display: grid; grid-template-columns: minmax(0, 1fr) 300px; gap: 28px; align-items: start; max-width: 1180px; margin: 0 auto; }
.blog-content-area, .article-content-area, .sidebar-card, .blog-card { border: 1px solid var(--blog-border); border-radius: var(--blog-radius); background: rgba(255,255,255,.94); box-shadow: 0 10px 28px rgba(15,23,42,.08); }
.blog-content-area, .article-content-area { padding: clamp(20px, 4vw, 34px); min-width: 0; }
.section-heading { margin-bottom: 24px; padding-bottom: 16px; border-bottom: 1px solid var(--blog-border); }
.section-heading span { color: var(--blog-subtle); font-weight: 700; }
.section-heading h2 { margin: 4px 0 0; color: var(--blog-text); font-size: clamp(1.5rem, 3vw, 2.1rem); }
.blog-grid { display: grid; grid-template-columns: 1fr; gap: 18px; }
.blog-card { display: grid; grid-template-columns: 220px minmax(0, 1fr); overflow: hidden; transition: transform .2s ease, border-color .2s ease, box-shadow .2s ease; }
.blog-card:hover { transform: translateY(-2px); border-color: var(--blog-border-strong); box-shadow: 0 18px 44px rgba(3,105,161,.16); }
.blog-card-image { display: block; min-height: 100%; background: var(--blog-soft); }
.blog-card-image img { width: 100%; height: 100%; min-height: 170px; object-fit: cover; }
.blog-card-body { padding: 20px; }
.blog-card-meta, .post-meta { display: flex; flex-wrap: wrap; gap: 10px; margin-bottom: 10px; color: var(--blog-subtle); font-size: .82rem; font-weight: 700; }
.blog-card h2 { margin: 0 0 10px; font-size: 1.18rem; line-height: 1.45; }
.blog-card h2 a, .sidebar-card a, .back-link { color: var(--blog-text); text-decoration: none; }
.read-more { color: var(--blog-accent); font-weight: 800; text-decoration: none; }
.blog-card h2 a:hover, .sidebar-card a:hover, .back-link:hover, .read-more:hover { color: var(--blog-accent-2); }
.blog-card p { margin: 0 0 14px; line-height: 1.75; }
.blog-sidebar { display: grid; gap: 16px; position: sticky; top: 88px; }
.sidebar-card { padding: 20px; }
.sidebar-card h2 { margin: 0 0 14px; color: var(--blog-text); font-size: 1rem; }
.sidebar-card ul { display: grid; gap: 10px; margin: 0; padding: 0; list-style: none; }
.sidebar-card li { padding-bottom: 10px; border-bottom: 1px solid var(--blog-border); }
.sidebar-card li:last-child { padding-bottom: 0; border-bottom: 0; }
.ad-card { background: linear-gradient(135deg, rgba(224,242,254,.95), rgba(209,250,229,.9)); border-color: var(--blog-border-strong); }
.ad-label { display: inline-block; margin-bottom: 8px; padding: 3px 8px; border: 1px solid var(--blog-border-strong); border-radius: 9999px; color: var(--blog-accent); font-size: .72rem; font-weight: 800; }
.ad-card p { margin: 0 0 6px; color: var(--blog-text); font-weight: 800; }
.sitenavi-slot { min-height: 96px; display: grid; place-items: center; text-align: center; border-style: dashed; color: var(--blog-muted); }
.article-header { margin-bottom: 24px; padding-bottom: 20px; border-bottom: 1px solid var(--blog-border); }
.back-link { display: inline-flex; margin-bottom: 18px; color: var(--blog-accent); font-weight: 800; }
.blog-hero-image { width: 100%; max-height: 430px; object-fit: cover; margin: 0 0 28px; border: 1px solid var(--blog-border); border-radius: var(--blog-radius); }
.article-body { color: var(--blog-text); font-size: 1.02rem; line-height: 1.9; }
.article-body h2, .article-body h3, .article-body h4 { margin: 2em 0 .7em; color: var(--blog-text); letter-spacing: -.02em; }
.article-body p, .article-body li { color: var(--blog-muted); }
.article-body a { color: var(--blog-accent); }
.toc ul { padding-left: 0; }
.empty-state { grid-template-columns: 1fr; }

@media (max-width: 768px) {
  .blog-main { padding: 92px 14px 64px; }
  .blog-layout { grid-template-columns: 1fr; }
  .blog-sidebar { position: static; }
  .blog-card { grid-template-columns: 1fr; }
  .blog-card-image img { max-height: 240px; }
  .blog-hero, .blog-content-area, .article-content-area { padding: 22px; }
}