:root {
  --orange: #D23F0B;
  --orange-soft: #FFE9DF;
  --ink: #1B1411;
  --muted: #6B625E;
  --line: #EAE4E0;
  --bg: #FBF8F6;
  --card: #FFFFFF;
}
@media (prefers-color-scheme: dark) {
  :root {
    --orange: #FF6A33;
    --orange-soft: #3A2016;
    --ink: #F4EFEC;
    --muted: #A89F9A;
    --line: #2E2724;
    --bg: #151110;
    --card: #1E1917;
  }
}
* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font: 16px/1.75 -apple-system, BlinkMacSystemFont, "PingFang SC", "Hiragino Sans GB", "Noto Sans SC", "Microsoft YaHei", sans-serif;
}
a { color: var(--orange); }
.wrap { max-width: 760px; margin: 0 auto; padding: 0 20px; }
header.site {
  border-bottom: 1px solid var(--line);
  background: var(--card);
}
header.site .wrap { display: flex; align-items: center; justify-content: space-between; height: 60px; }
.brand { display: flex; align-items: center; gap: 10px; font-weight: 900; font-size: 20px; color: var(--ink); text-decoration: none; }
.logo {
  width: 32px; height: 32px; border-radius: 9px; background: var(--orange);
  display: grid; place-items: center; color: #fff; font-size: 18px;
}
nav a { color: var(--muted); text-decoration: none; margin-left: 16px; font-size: 14px; }
nav a:hover { color: var(--ink); }
.hero { padding: 64px 0 40px; }
.hero h1 { font-size: clamp(34px, 7vw, 52px); line-height: 1.15; margin: 0 0 16px; font-weight: 900; letter-spacing: -0.5px; }
.hero h1 em { font-style: normal; color: var(--orange); }
.hero p { font-size: 18px; color: var(--muted); margin: 0 0 28px; }
.badge {
  display: inline-block; padding: 12px 22px; border-radius: 14px; background: var(--orange); color: #fff;
  font-weight: 700; text-decoration: none;
}
.note { font-size: 13px; color: var(--muted); margin-top: 10px; }
.features { display: grid; grid-template-columns: repeat(auto-fit, minmax(210px, 1fr)); gap: 14px; padding: 12px 0 56px; }
.feature { background: var(--card); border: 1px solid var(--line); border-radius: 18px; padding: 18px 18px 14px; }
.feature .icon { width: 36px; height: 36px; border-radius: 10px; background: var(--orange-soft); display: grid; place-items: center; font-size: 18px; margin-bottom: 10px; }
.feature h3 { margin: 0 0 4px; font-size: 17px; }
.feature p { margin: 0; color: var(--muted); font-size: 14px; line-height: 1.6; }
article { padding: 40px 0 64px; }
article h1 { font-size: 30px; margin: 0 0 6px; font-weight: 900; }
article .meta { color: var(--muted); font-size: 14px; margin: 0 0 28px; }
article h2 { font-size: 20px; margin: 34px 0 8px; }
article h3 { font-size: 16px; margin: 20px 0 6px; }
article p, article li { color: var(--ink); }
article ul { padding-left: 1.3em; }
article table { width: 100%; border-collapse: collapse; font-size: 14px; margin: 10px 0; }
article th, article td { text-align: left; vertical-align: top; border-bottom: 1px solid var(--line); padding: 8px 6px; }
article th { color: var(--muted); font-weight: 600; }
.card { background: var(--card); border: 1px solid var(--line); border-radius: 16px; padding: 16px 18px; margin: 14px 0; }
footer.site { border-top: 1px solid var(--line); padding: 22px 0 36px; color: var(--muted); font-size: 13px; }
footer.site a { color: var(--muted); margin-right: 14px; }