:root {
  color-scheme: light;
  font-family: "Instrument Sans", "PingFang SC", "Microsoft YaHei", system-ui, sans-serif;
  color: #172f2b;
  background: #f4f8f4;
  line-height: 1.75;
}
* { box-sizing: border-box; }
body { margin: 0; }
a { color: #07594a; text-underline-offset: .2em; }
a:hover { color: #093c34; }
a:focus-visible { outline: 2px solid #156551; outline-offset: 4px; }
.wrap { width: min(100% - 2.5rem, 49rem); margin-inline: auto; }
header { background: #fbfdfa; border-bottom: 1px solid #d9e5dc; }
.bar { display: flex; align-items: center; justify-content: space-between; gap: .6rem 1.5rem; flex-wrap: wrap; padding-block: 1rem; }
.brand { color: #172f2b; font-weight: 700; text-decoration: none; }
nav { display: flex; flex-wrap: wrap; gap: .4rem 1.1rem; }
nav a { font-size: .9rem; text-decoration: none; }
nav a:hover, nav [aria-current="page"] { text-decoration: underline; }
.intro { padding: clamp(2.75rem, 10vw, 5.75rem) 0 2.1rem; border-bottom: 1px solid #c9ddd2; }
.tag { color: #326450; font-size: .9rem; margin: 0 0 .65rem; font-weight: 650; }
h1 { font-size: clamp(2.1rem, 7.5vw, 3.75rem); line-height: 1.12; margin: 0; letter-spacing: -.03em; }
.lead { font-size: clamp(1.03rem, 3vw, 1.25rem); color: #35564e; margin: 1.1rem 0 0; }
.content { padding: 1.7rem 0 3rem; }
section { margin: 0 0 2rem; }
section:last-child { margin-bottom: 0; }
h2 { font-size: 1.23rem; line-height: 1.4; margin: 0 0 .5rem; }
p { margin: .45rem 0 .8rem; }
ol { padding-inline-start: 1.5em; margin: .65rem 0; }
li + li { margin-top: .3rem; }
.date { color: #48645b; font-size: .88rem; margin: 0 0 1.5rem; }
footer { border-top: 1px solid #d9e5dc; color: #48645b; font-size: .87rem; }
@media (max-width: 29rem) { header nav { width: 100%; } }