:root {
  color-scheme: light;
  font: 16px/1.7 "Microsoft YaHei", system-ui, sans-serif;
  color: #193b2c;
  background: #f0f8f2;
}

* { box-sizing: border-box; }
body { margin: 0; }

header {
  display: flex;
  align-items: center;
  gap: 10px;
  max-width: 860px;
  margin: auto;
  padding: 24px clamp(16px, 5vw, 40px);
  font-weight: 750;
  font-size: 1.15rem;
}

.mark {
  display: inline-grid;
  place-items: center;
  width: 34px;
  height: 34px;
  border-radius: 8px;
  background: linear-gradient(145deg, #6ee5b2, #b8edc9);
}

main {
  max-width: 780px;
  margin: 0 auto 40px;
  padding: clamp(20px, 5vw, 42px);
  border: 1px solid #d4e5d9;
  border-radius: 16px;
  background: #fff;
}

nav {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 20px;
  padding-bottom: 12px;
  border-bottom: 1px solid #d4e5d9;
}

a { color: #136648; text-underline-offset: 0.18em; }
a[aria-current] { color: #193b2c; font-weight: 700; }
h1 { margin: 24px 0 8px; font-size: clamp(1.8rem, 5vw, 2.5rem); line-height: 1.2; }
h2 { margin: 24px 0 8px; font-size: 1.18rem; }
p, ul, ol { margin: 0 0 12px; }
ul, ol { padding-left: 1.4em; }
li + li { margin-top: 8px; }

@media (max-width: 820px) {
  main { margin-right: 16px; margin-left: 16px; }
}