:root {
  --ink: #1f2328;
  --muted: #5d6670;
  --paper: #fbf9f5;
  --line: #e4ded3;
  --accent: #c2410c;
  --accent-ink: #fff;
  font-family: system-ui, -apple-system, "Segoe UI", sans-serif;
  color: var(--ink);
  background: var(--paper);
}
* { box-sizing: border-box; }
body { margin: 0; line-height: 1.5; }
a { color: var(--accent); }
.top { display: flex; justify-content: space-between; align-items: center; padding: 0.8rem 1.2rem; border-bottom: 1px solid var(--line); }
.top nav { display: flex; gap: 0.8rem; align-items: center; font-size: 0.9rem; }
.brand { font-weight: 800; color: var(--ink); text-decoration: none; letter-spacing: -0.02em; }
button { font: inherit; background: none; border: 1px solid var(--line); border-radius: 6px; padding: 0.25rem 0.7rem; cursor: pointer; }
.admin .banner { margin-bottom: 1rem; border-radius: 10px; }
.banner { margin: 0; padding: 0.6rem 1.2rem; background: #fff4d6; border-bottom: 1px solid #f0dca0; font-size: 0.9rem; }
.notice { background: #e8f5e9; border-color: #b7dfb9; }
.store, .admin { max-width: 1040px; margin: 0 auto; padding: 1.5rem 1.2rem 6rem; }
.narrow { max-width: 560px; margin: 4rem auto; padding: 0 1.2rem; }
.hero { display: grid; grid-template-columns: 1.1fr 1fr; gap: 2rem; align-items: center; }
.art img { width: 100%; border-radius: 14px; display: block; }
h1 { font-size: 2.1rem; line-height: 1.15; margin: 0 0 0.6rem; letter-spacing: -0.02em; }
h2 { font-size: 1.15rem; margin: 2.2rem 0 0.6rem; }
.summary { color: var(--muted); font-size: 1.1rem; }
.price { font-size: 1.6rem; font-weight: 700; margin: 0.8rem 0; }
.buy { display: inline-block; background: var(--accent); color: var(--accent-ink); padding: 0.75rem 1.6rem; border-radius: 10px; text-decoration: none; font-weight: 700; }
.buy.disabled { background: #b9b2a7; cursor: not-allowed; }
.note { color: var(--muted); font-size: 0.85rem; }
.benefits { padding-left: 1.2rem; }
.faq dt { font-weight: 600; margin-top: 0.8rem; }
.faq dd { margin: 0.2rem 0 0; color: var(--muted); }
.policies { border-top: 1px solid var(--line); margin-top: 2rem; color: var(--muted); font-size: 0.95rem; }
.buy-bar { display: none; }
.cards { display: grid; grid-template-columns: repeat(auto-fill, minmax(180px, 1fr)); gap: 0.8rem; }
.card { border: 1px solid var(--line); border-radius: 12px; padding: 0.9rem; background: #fff; display: flex; flex-direction: column; gap: 0.15rem; }
.card span { color: var(--muted); font-size: 0.85rem; }
.card strong { font-size: 1.5rem; }
.card small { color: var(--muted); }
.chart { height: 180px; border: 1px solid var(--line); border-radius: 12px; background: #fff; padding: 0.6rem; }
.chart svg { width: 100%; height: 100%; }
.chart rect { fill: var(--accent); }
table { width: 100%; border-collapse: collapse; font-size: 0.9rem; }
th, td { text-align: left; padding: 0.4rem 0.3rem; border-bottom: 1px solid var(--line); }
th { color: var(--muted); font-weight: 600; }
details { margin-top: 0.6rem; }
.split { display: grid; grid-template-columns: 2fr 1fr; gap: 1.5rem; }
@media (max-width: 760px) {
  .hero, .split { grid-template-columns: 1fr; }
  h1 { font-size: 1.7rem; }
  .buy-bar { display: flex; justify-content: space-between; align-items: center; position: fixed; left: 0; right: 0; bottom: 0; padding: 0.7rem 1.2rem; background: #fff; border-top: 1px solid var(--line); font-weight: 700; }
}