:root {
  color-scheme: light;
  --bg: #f6f7fa;
  --card: #fff;
  --fg: #172033;
  --muted: #5d6779;
  --border: #e1e5ec;
  --primary: #0a6cf0;
  --primary-soft: #e8f1ff;
  --crit: #d62e4a;
  --code: #eef1f5;
  font-family: "Segoe UI Variable Text", "Segoe UI", "PingFang SC", "Microsoft YaHei", system-ui, sans-serif;
}
@media (prefers-color-scheme: dark) {
  :root {
    color-scheme: dark;
    --bg: #14161b;
    --card: #1c1f26;
    --fg: #e6eaf1;
    --muted: #9aa3b2;
    --border: #2c313b;
    --primary: #4d9bff;
    --primary-soft: #1b2b44;
    --crit: #f06a80;
    --code: #252a33;
  }
}
* { box-sizing: border-box; }
body { margin: 0; background: var(--bg); color: var(--fg); font-size: 16px; line-height: 1.65; }
a { color: var(--primary); }
code { font-family: "Cascadia Mono", Consolas, ui-monospace, monospace; font-size: 0.88em; background: var(--code); padding: 1px 5px; border-radius: 4px; }
.wrap { max-width: 1040px; margin: 0 auto; padding: 0 20px; }
header.top { display: flex; align-items: center; justify-content: space-between; gap: 12px; padding: 18px 0; }
.brand { display: flex; align-items: center; gap: 10px; font-weight: 650; color: var(--fg); text-decoration: none; }
.brand img { width: 32px; height: 32px; }
.top nav { display: flex; gap: 16px; font-size: 14px; }
.hero { padding: 48px 0 28px; text-align: center; }
.hero h1 { font-size: clamp(30px, 5vw, 46px); line-height: 1.15; margin: 0 0 16px; letter-spacing: -0.02em; }
.hero p.lead { font-size: 18px; color: var(--muted); max-width: 720px; margin: 0 auto 26px; }
.cta { display: flex; flex-wrap: wrap; gap: 10px; justify-content: center; }
.btn { display: inline-flex; align-items: center; gap: 8px; height: 44px; padding: 0 20px; border-radius: 10px; font-weight: 600; text-decoration: none; border: 1px solid var(--border); background: var(--card); color: var(--fg); }
.btn.primary { background: var(--primary); border-color: var(--primary); color: #fff; }
.note { font-size: 13px; color: var(--muted); margin-top: 12px; }
.shot { margin: 30px auto 0; border-radius: 14px; overflow: hidden; border: 1px solid var(--border); box-shadow: 0 20px 60px rgb(10 20 40 / 0.14); }
.shot img { display: block; width: 100%; height: auto; }
section { padding: 44px 0; }
section h2 { font-size: 26px; margin: 0 0 18px; letter-spacing: -0.01em; }
.grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(290px, 1fr)); gap: 14px; }
.card { background: var(--card); border: 1px solid var(--border); border-radius: 12px; padding: 18px; }
.card h3 { margin: 0 0 6px; font-size: 16px; }
.card p { margin: 0; color: var(--muted); font-size: 14.5px; }
.facts { display: grid; grid-template-columns: repeat(auto-fit, minmax(220px, 1fr)); gap: 14px; }
.facts li { list-style: none; }
ul.plain { padding-left: 20px; }
ul.plain li { margin: 6px 0; }
.faq details { background: var(--card); border: 1px solid var(--border); border-radius: 10px; padding: 14px 18px; margin-bottom: 10px; }
.faq summary { font-weight: 600; cursor: pointer; }
.faq details p { margin: 10px 0 0; color: var(--muted); }
footer { padding: 30px 0 50px; color: var(--muted); font-size: 14px; border-top: 1px solid var(--border); }
@media (max-width: 560px) {
  .top nav a.hide-sm { display: none; }
  .hero { padding-top: 24px; }
  .hero p.lead { font-size: 16px; }
}