:root {
  --bg: #fdfdfb;
  --surface: #ffffff;
  --text-main: #2c2926;
  --text-muted: #6b7280;
  --accent: #1e40af;
  --accent-soft: #f1f5f9;
  --success: #059669;
  --border: #e8eaed;
  --card-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.05), 0 2px 4px -1px rgba(0, 0, 0, 0.03);
  --font-serif: 'Noto Serif JP', Georgia, serif;
  --font-sans: 'Inter', system-ui, -apple-system, sans-serif;
  
  --amazon: #FF9900;
  --rakuten: #BF0000;
  --yahoo: #FF0033;
  --official: #111111;
}
* { box-sizing: border-box; }
body {
  margin: 0;
  font-family: var(--font-sans);
  color: var(--text-main);
  background-color: var(--bg);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
}
a { color: inherit; text-decoration: none; transition: 0.2s ease; }

.shell { max-width: 1000px; margin: 0 auto; padding: 0 20px; }

header { 
  background: var(--surface); 
  border-bottom: 1px solid var(--border); 
  padding: 12px 0; 
  position: sticky; top: 0; z-index: 100;
}
.header-content { display: flex; justify-content: center; align-items: center; }
.site-logo { 
  font-family: var(--font-serif);
  font-size: 1rem; 
  font-weight: 900; 
  letter-spacing: 0.05em; 
  color: #111; 
  text-transform: uppercase;
}
.site-logo span { font-weight: 400; color: var(--accent); }

.nav-section { background: #fff; border-bottom: 1px solid var(--border); padding: 8px 0; overflow-x: auto; -webkit-overflow-scrolling: touch; }
.nav-pills { display: flex; justify-content: center; gap: 12px; }
.pill { 
  font-size: 0.75rem; font-weight: 800; padding: 6px 14px; 
  border-radius: 20px; background: #f3f4f6; color: var(--text-muted);
  white-space: nowrap;
}
.pill:hover { background: var(--accent-soft); color: var(--accent); }

.hero {
  text-align: center;
  padding: 32px 20px;
  background: #fff;
  border-bottom: 1px solid var(--border);
}
.hero h1 { 
  font-family: var(--font-serif);
  font-size: clamp(1.5rem, 5vw, 2.2rem); 
  font-weight: 950; 
  line-height: 1.25; 
  margin: 0 0 12px;
}
.hero p { max-width: 500px; margin: 0 auto; font-size: 0.95rem; color: var(--text-muted); }

.post-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(280px, 1fr)); gap: 24px; padding: 40px 0; }
.post-card {
  background: #fff;
  border: 1px solid var(--border);
  border-radius: 8px;
  overflow: hidden;
  transition: transform 0.2s ease, box-shadow 0.2s ease;
}
.post-card:hover { transform: translateY(-2px); box-shadow: var(--card-shadow); }
.card-content { padding: 20px; }
.card-meta { display: flex; gap: 8px; margin-bottom: 10px; }
.badge { font-size: 0.65rem; font-weight: 800; padding: 2px 6px; background: var(--accent-soft); color: var(--accent); border-radius: 4px; }

.post-card h3 { 
  font-family: var(--font-serif);
  font-size: 1.1rem; 
  font-weight: 900; 
  margin: 0 0 8px; 
  line-height: 1.5; 
}
.post-card p { color: var(--text-muted); font-size: 0.85rem; margin: 0; line-height: 1.6; display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical; overflow: hidden; }

.article-container { max-width: 760px; margin: 0 auto; padding: 32px 0; }
.article-header { margin-bottom: 24px; text-align: center; }
.article-title { 
  font-family: var(--font-serif);
  font-size: clamp(1.6rem, 6vw, 2.4rem); 
  font-weight: 950; 
  line-height: 1.3; 
  margin: 12px 0; 
}
.meta-row { font-size: 0.8rem; font-weight: 700; color: var(--text-muted); margin-bottom: 16px; }

.summary-card {
  background: #fff;
  border: 2px solid var(--accent);
  border-radius: 12px;
  padding: 24px;
  margin-bottom: 40px;
  box-shadow: 0 10px 15px -3px rgba(0,0,0,0.05);
}
.summary-card h4 { 
  margin: 0 0 20px; font-size: 0.9rem; font-weight: 900; color: var(--accent); 
  display: flex; align-items: center; gap: 8px; text-transform: uppercase; letter-spacing: 0.05em;
}
.summary-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(160px, 1fr)); gap: 20px; }
.summary-item label { display: block; font-size: 0.7rem; font-weight: 800; color: #999; margin-bottom: 4px; }
.summary-item span { font-weight: 900; font-size: 0.95rem; color: #111; line-height: 1.4; display: block; }

.cta-brick { margin-bottom: 48px; }
.brick-label { color: var(--accent); font-size: 0.75rem; font-weight: 900; margin-bottom: 16px; display: block; letter-spacing: 0.1em; }
.cta-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(160px, 1fr)); gap: 12px; }
.cta-card {
  padding: 18px; border-radius: 8px; text-align: center; font-weight: 900; font-size: 0.9rem;
  display: flex; flex-direction: column; align-items: center; gap: 6px; border: 1px solid var(--border);
  transition: 0.2s ease;
}
.cta-card span { font-size: 0.65rem; font-weight: 700; opacity: 0.7; }
.cta-amazon { background: #fff; border-color: var(--amazon); color: #c45500; }
.cta-rakuten { background: #fff; border-color: var(--rakuten); color: var(--rakuten); }
.cta-yahoo { background: #fff; border-color: var(--yahoo); color: var(--yahoo); }
.cta-official { background: #111; border-color: #111; color: #fff; }
.cta-card:hover { transform: translateY(-3px); box-shadow: 0 10px 20px -5px rgba(0,0,0,0.1); }
.cta-card:focus-visible { outline: 3px solid rgba(30, 64, 175, 0.2); outline-offset: 2px; }

.insight-band {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
  margin: 0 0 32px;
}
.insight-card {
  background: #fff;
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 16px;
}
.insight-card strong { display: block; font-size: 0.8rem; color: var(--accent); margin-bottom: 8px; }
.insight-card p { margin: 0; font-size: 0.88rem; color: var(--text-muted); line-height: 1.65; }

.content-brick { margin-bottom: 56px; }
.article-body { font-family: var(--font-serif); font-size: 1.15rem; line-height: 1.95; color: #222; }
.article-body h2 { 
  font-size: 1.6rem; font-weight: 950; margin: 0 0 24px; padding: 12px 16px;
  background: var(--accent-soft); border-radius: 6px; border-left: 4px solid var(--accent);
}
.article-body p { margin: 0 0 24px; }

.section-nav {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
  margin: 0 0 28px;
}
.section-nav a {
  padding: 8px 12px;
  border-radius: 999px;
  background: #fff;
  border: 1px solid var(--border);
  color: var(--text-muted);
  font-size: 0.8rem;
  font-weight: 800;
}
.section-nav a:hover { border-color: var(--accent); color: var(--accent); }

.related-feed { margin-top: 80px; padding-top: 40px; border-top: 1px solid var(--border); }
.related-feed h4 { font-family: var(--font-serif); font-size: 1.4rem; margin-bottom: 32px; font-weight: 950; text-align: center; }

.section-split {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 24px;
  margin-top: 40px;
}
.mini-panel {
  background: #fff;
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 20px;
}
.mini-panel h5 {
  margin: 0 0 12px;
  font-size: 0.95rem;
  font-weight: 900;
}
.mini-panel p {
  margin: 0;
  color: var(--text-muted);
  font-size: 0.88rem;
  line-height: 1.7;
}

@media (max-width: 600px) {
  .shell { padding: 0 16px; }
  .summary-grid { grid-template-columns: repeat(2, 1fr); gap: 16px; }
  .cta-grid { grid-template-columns: repeat(2, 1fr); }
  .article-title { font-size: 1.6rem; }
  .insight-band { grid-template-columns: 1fr; }
  .section-split { grid-template-columns: 1fr; }
}