:root {
  --orange: #EA580C;
  --orange-soft: #FFF4ED;
  --ink: #1F2937;
  --muted: #6B7280;
  --line: #E5E7EB;
}
* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  font-family: -apple-system, "PingFang TC", "Noto Sans TC", "Microsoft JhengHei", sans-serif;
  color: var(--ink);
  line-height: 1.75;
  background: #fff;
}
header.site {
  background: var(--orange);
  color: #fff;
  padding: 18px 20px;
}
header.site .wrap { max-width: 820px; margin: 0 auto; display: flex; align-items: center; gap: 12px; }
header.site .logo {
  width: 40px; height: 40px; border-radius: 10px; background: #fff;
  color: var(--orange); font-weight: 800; display: grid; place-items: center; font-size: 20px;
}
header.site .name { font-size: 18px; font-weight: 700; }
nav.top { background: var(--orange-soft); border-bottom: 1px solid var(--line); }
nav.top .wrap { max-width: 820px; margin: 0 auto; padding: 10px 20px; display: flex; gap: 18px; flex-wrap: wrap; }
nav.top a { color: var(--orange); text-decoration: none; font-weight: 600; font-size: 15px; }
nav.top a:hover { text-decoration: underline; }
main { max-width: 820px; margin: 0 auto; padding: 28px 20px 64px; }
h1 { font-size: 28px; line-height: 1.3; margin: 8px 0 4px; }
h2 { font-size: 21px; margin: 34px 0 10px; padding-top: 8px; border-top: 1px solid var(--line); }
h3 { font-size: 17px; margin: 20px 0 6px; }
.meta { color: var(--muted); font-size: 14px; margin-bottom: 8px; }
table { border-collapse: collapse; width: 100%; margin: 14px 0; font-size: 15px; }
th, td { border: 1px solid var(--line); padding: 8px 10px; text-align: left; vertical-align: top; }
th { background: var(--orange-soft); }
a { color: var(--orange); }
.lead { font-size: 17px; color: #374151; }
.btn {
  display: inline-block; background: var(--orange); color: #fff; text-decoration: none;
  padding: 12px 22px; border-radius: 10px; font-weight: 700; margin: 6px 8px 6px 0;
}
.card { border: 1px solid var(--line); border-radius: 14px; padding: 18px 20px; margin: 14px 0; background: #fff; }
.muted { color: var(--muted); }
footer.site { border-top: 1px solid var(--line); color: var(--muted); font-size: 14px; padding: 24px 20px; }
footer.site .wrap { max-width: 820px; margin: 0 auto; }
ul { padding-left: 22px; }
blockquote { border-left: 4px solid var(--orange); margin: 16px 0; padding: 4px 16px; color: var(--muted); background: var(--orange-soft); border-radius: 0 8px 8px 0; }
code { background: #F3F4F6; padding: 2px 6px; border-radius: 6px; font-size: 90%; }