:root {
  color-scheme: light;
  --ink: #152119;
  --muted: #5c6b61;
  --line: #dce5de;
  --leaf: #23653b;
  --leaf-dark: #164628;
  --paper: #f5f8f5;
  --card: #ffffff;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  background:
    radial-gradient(circle at top right, rgba(65, 143, 86, .13), transparent 36rem),
    var(--paper);
  color: var(--ink);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
    "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  line-height: 1.75;
}

main {
  width: min(880px, calc(100% - 32px));
  margin: 0 auto;
  padding: 48px 0 72px;
}

.brand {
  color: var(--leaf-dark);
  font-size: 1.05rem;
  font-weight: 800;
  letter-spacing: .14em;
  text-decoration: none;
}

.eyebrow {
  margin: 48px 0 8px;
  color: var(--leaf);
  font-size: .78rem;
  font-weight: 800;
  letter-spacing: .16em;
}

h1 {
  margin: 0;
  font-size: clamp(2.2rem, 8vw, 4.3rem);
  line-height: 1.08;
  letter-spacing: -.04em;
}

h2 {
  margin: 0 0 10px;
  font-size: 1.25rem;
}

h3 { margin-bottom: 6px; }

.lead {
  max-width: 700px;
  margin: 20px 0 32px;
  color: var(--muted);
  font-size: 1.08rem;
}

section {
  margin: 18px 0;
  padding: 22px 24px;
  border: 1px solid var(--line);
  border-radius: 18px;
  background: rgba(255, 255, 255, .9);
  box-shadow: 0 12px 30px rgba(25, 58, 34, .05);
}

ul, ol { padding-left: 1.35rem; }
li + li { margin-top: 6px; }

a { color: var(--leaf-dark); }

.actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin: 24px 0;
}

.button {
  display: inline-block;
  padding: 12px 20px;
  border: 1px solid var(--leaf);
  border-radius: 999px;
  background: var(--leaf);
  color: white;
  font-weight: 700;
  text-decoration: none;
}

.button.secondary {
  background: transparent;
  color: var(--leaf-dark);
}

nav {
  display: flex;
  flex-wrap: wrap;
  gap: 10px 20px;
  margin-top: 40px;
  padding-top: 22px;
  border-top: 1px solid var(--line);
  font-size: .92rem;
}

.meta {
  color: var(--muted);
  font-size: .9rem;
}

.notice {
  border-left: 4px solid var(--leaf);
}

code {
  padding: 2px 6px;
  border-radius: 6px;
  background: #eaf0eb;
}

@media (max-width: 560px) {
  main { padding-top: 28px; }
  .eyebrow { margin-top: 34px; }
  section { padding: 18px; }
  .button { width: 100%; text-align: center; }
}