:root {
  --accent: #d9480f;
  --bg: #fafafa;
  --card-bg: #ffffff;
  --border: #e2e2e2;
  --text: #222;
  --muted: #666;
}
* { box-sizing: border-box; }
body {
  margin: 0;
  font-family: "Hiragino Sans", "Yu Gothic", sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.7;
}
.site-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 1rem 1.5rem;
  background: #fff;
  border-bottom: 1px solid var(--border);
}
.site-header .logo { font-weight: bold; font-size: 1.2rem; color: var(--text); text-decoration: none; }
.site-header .nav a { margin-left: 1rem; color: var(--text); text-decoration: none; font-size: 0.95rem; }
.site-header .nav a:hover { color: var(--accent); }
main { max-width: 960px; margin: 0 auto; padding: 1.5rem; }
h1 { font-size: 1.6rem; }
h2 { font-size: 1.3rem; margin-top: 2rem; }
.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
  gap: 1rem;
  margin: 1rem 0;
}
.product-card {
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 1rem;
}
.product-card h3 { font-size: 1rem; margin: 0 0 0.5rem; }
.product-card .price { font-size: 1.3rem; font-weight: bold; color: var(--accent); }
.product-card .drop { color: #c92a2a; font-weight: bold; font-size: 0.9rem; }
.product-card .no-price { color: var(--muted); font-size: 0.9rem; }
.pr-badge {
  display: inline-block;
  font-size: 0.7rem;
  background: #ffe066;
  color: #664d03;
  border-radius: 4px;
  padding: 0.1rem 0.4rem;
  margin-left: 0.3rem;
  vertical-align: middle;
}
.buy-link {
  display: inline-block;
  margin-top: 0.5rem;
  padding: 0.4rem 0.8rem;
  background: var(--accent);
  color: #fff;
  text-decoration: none;
  border-radius: 4px;
  font-size: 0.9rem;
}
.category-links a {
  display: inline-block;
  margin: 0.2rem 0.4rem 0.2rem 0;
  padding: 0.3rem 0.7rem;
  background: #fff;
  border: 1px solid var(--border);
  border-radius: 20px;
  text-decoration: none;
  color: var(--text);
  font-size: 0.9rem;
}
.price-note { font-size: 0.8rem; color: var(--muted); }
.faq dt { font-weight: bold; margin-top: 0.8rem; }
.faq dd { margin-left: 0; color: var(--muted); }
.site-footer {
  margin-top: 3rem;
  padding: 1.5rem;
  border-top: 1px solid var(--border);
  font-size: 0.8rem;
  color: var(--muted);
  text-align: center;
}
canvas.price-chart { max-width: 100%; background: #fff; border: 1px solid var(--border); border-radius: 8px; padding: 0.5rem; }