:root {
  color-scheme: light;
  font-family: "Microsoft YaHei", "PingFang SC", system-ui, sans-serif;
  color: #202124;
  background: #f5f7f8;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  line-height: 1.75;
}

header {
  background: #ffffff;
  border-bottom: 1px solid #dfe3e6;
}

.nav, main, footer {
  width: min(900px, calc(100% - 32px));
  margin: 0 auto;
}

.nav {
  min-height: 64px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}

.brand {
  color: #1f5f46;
  font-size: 17px;
  font-weight: 700;
  text-decoration: none;
}

nav { display: flex; gap: 20px; }
nav a { color: #3c4541; text-decoration: none; }
nav a:hover, nav a:focus { color: #126f4d; text-decoration: underline; }

main {
  background: #ffffff;
  margin-top: 32px;
  margin-bottom: 32px;
  padding: clamp(24px, 5vw, 52px);
  border: 1px solid #dfe3e6;
  border-radius: 6px;
}

h1 { margin: 0 0 8px; font-size: 30px; line-height: 1.3; }
h2 { margin-top: 34px; font-size: 21px; }
h3 { margin-top: 24px; font-size: 17px; }
p, li { font-size: 15px; }
.meta { color: #626a66; margin-bottom: 30px; }
.notice {
  border-left: 4px solid #16835c;
  background: #f0f8f4;
  padding: 12px 16px;
}
table { width: 100%; border-collapse: collapse; margin: 18px 0; }
th, td { padding: 10px; border: 1px solid #dfe3e6; text-align: left; vertical-align: top; }
th { background: #f5f7f8; }
footer { padding: 0 0 32px; color: #626a66; font-size: 13px; }

@media (max-width: 640px) {
  .nav { align-items: flex-start; flex-direction: column; padding: 14px 0; gap: 8px; }
  main { margin-top: 16px; padding: 22px 18px; }
  h1 { font-size: 25px; }
  table { display: block; overflow-x: auto; }
}