:root {
  color-scheme: light;
  --bg: #f6fbf8;
  --surface: #ffffff;
  --ink: #14231b;
  --muted: #587064;
  --line: #dbece2;
  --green: #19ad67;
  --green-dark: #108651;
  --green-soft: #eaf8f0;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  color: var(--ink);
  font-family: -apple-system, BlinkMacSystemFont, "SF Pro Text", "Segoe UI", "PingFang SC", "PingFang TC", "Microsoft YaHei", Arial, sans-serif;
  line-height: 1.72;
  overflow-x: hidden;
  background: linear-gradient(180deg, #f9fffb 0%, var(--bg) 52%, #ffffff 100%);
}

p,
h1,
h2,
li,
a {
  overflow-wrap: break-word;
}

main {
  width: min(920px, calc(100% - 36px));
  margin: 0 auto;
  padding: 42px 0 72px;
}

nav {
  display: flex;
  justify-content: space-between;
  gap: 18px;
  align-items: center;
  border-bottom: 1px solid var(--line);
  padding-bottom: 20px;
  margin-bottom: 48px;
}

nav a {
  color: inherit;
  text-decoration: none;
  font-weight: 820;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
}

.brand img {
  width: 34px;
  height: 34px;
  border-radius: 9px;
}

.links {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
}

.links a {
  color: var(--muted);
  font-weight: 680;
}

h1 {
  font-size: clamp(38px, 6vw, 64px);
  line-height: 1;
  margin: 0 0 12px;
  letter-spacing: 0;
}

.meta {
  color: var(--muted);
  margin: 0 0 36px;
}

h2 {
  font-size: 25px;
  margin: 34px 0 10px;
}

p { margin: 0 0 12px; }

ul {
  margin: 0;
  padding-left: 22px;
}

li { margin: 7px 0; }

a {
  color: var(--green-dark);
  text-underline-offset: 4px;
}

.note {
  padding: 18px 20px;
  border: 1px solid rgb(20 35 27 / 0.18);
  border-radius: 16px;
  background: rgb(255 255 255 / 0.88);
  font-weight: 750;
}

.subnote {
  padding: 16px 18px;
  border-radius: 14px;
  background: var(--green-soft);
}

@media (max-width: 720px) {
  main {
    width: min(100% - 28px, 920px);
    padding-top: 28px;
  }

  nav {
    align-items: flex-start;
    flex-direction: column;
    margin-bottom: 34px;
  }
}