:root { --member: #c62828; --shop: #283593; }
* { box-sizing: border-box; }
body {
  font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Segoe UI", sans-serif;
  margin: 0; background: #f5f5f5; color: #222; line-height: 1.7;
}
.hero { color: #fff; padding: 1.75rem 1.25rem; text-align: center; }
.hero.member { background: linear-gradient(135deg, #b71c1c, var(--member)); }
.hero.shop { background: linear-gradient(135deg, #1a237e, var(--shop)); }
.hero h1 { margin: 0 0 .4rem; font-size: 1.35rem; }
.hero p { margin: .25rem 0; opacity: .92; font-size: .875rem; }
.topnav {
  display: flex; flex-wrap: wrap; gap: .5rem; justify-content: center;
  padding: .75rem 1rem; background: #fff; border-bottom: 1px solid #e0e0e0;
  position: sticky; top: 0; z-index: 10;
}
.topnav a {
  padding: .4rem .85rem; border-radius: 999px; text-decoration: none;
  font-size: .8125rem; font-weight: 600; background: #f0f0f0; color: #333;
}
.wrap { max-width: 720px; margin: 0 auto; padding: 1rem 1rem 2.5rem; }
article {
  background: #fff; border-radius: 12px; padding: 1.25rem 1.35rem;
  box-shadow: 0 1px 4px rgba(0,0,0,.06);
}
article h2 { font-size: 1.1rem; margin: 1.5rem 0 .65rem; padding-bottom: .35rem; border-bottom: 2px solid #eee; }
article h2:first-child { margin-top: 0; }
article h3 { font-size: 1rem; margin: 1rem 0 .5rem; }
article p, article li { font-size: .9375rem; }
article ul, article ol { padding-left: 1.25rem; }
.meta { background: #fafafa; border-radius: 8px; padding: .75rem 1rem; font-size: .875rem; margin-bottom: 1rem; }
table { width: 100%; border-collapse: collapse; font-size: .875rem; margin: .75rem 0; }
th, td { border: 1px solid #eee; padding: .5rem .65rem; text-align: left; vertical-align: top; }
th { background: #fafafa; }
figure { margin: 1rem 0; text-align: center; }
figcaption { font-size: .8125rem; color: #666; margin-top: .45rem; }
.tip { background: #fff8e1; border-left: 4px solid #ffc107; padding: .65rem .85rem; font-size: .875rem; margin: .75rem 0; border-radius: 0 8px 8px 0; }
code { background: #f5f5f5; padding: .1rem .35rem; border-radius: 4px; font-size: .85em; word-break: break-all; }
pre { background: #263238; color: #eceff1; padding: .75rem 1rem; border-radius: 8px; overflow-x: auto; font-size: .8125rem; }
.footer { text-align: center; font-size: .8125rem; color: #888; padding: 1rem; }
hr { border: 0; border-top: 1px solid #eee; margin: 1.25rem 0; }