:root {
  --bg: #fbfbfa;
  --fg: #1f2328;
  --muted: #656d76;
  --line: #e3e5e8;
  --card: #ffffff;
  --accent: #3f7d58;
  --accent-soft: #eef4ef;
  color-scheme: light;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #16181c;
    --fg: #e6e8ea;
    --muted: #9aa2ab;
    --line: #2c3037;
    --card: #1d2025;
    --accent: #7fc79b;
    --accent-soft: #202a24;
    color-scheme: dark;
  }
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  padding: 48px 20px 72px;
  background: var(--bg);
  color: var(--fg);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
    "Hiragino Sans GB", "Microsoft YaHei", Roboto, Helvetica, Arial, sans-serif;
  font-size: 16px;
  line-height: 1.75;
  -webkit-font-smoothing: antialiased;
}

main {
  max-width: 720px;
  margin: 0 auto;
}

header {
  margin-bottom: 40px;
}

.brand {
  display: inline-block;
  font-size: 15px;
  font-weight: 600;
  letter-spacing: 0.02em;
  color: var(--accent);
  background: var(--accent-soft);
  border-radius: 999px;
  padding: 4px 14px;
  margin-bottom: 20px;
}

h1 {
  font-size: 30px;
  line-height: 1.35;
  margin: 0 0 12px;
  letter-spacing: -0.01em;
}

h2 {
  font-size: 18px;
  margin: 36px 0 8px;
}

p {
  margin: 0 0 14px;
}

.lead {
  font-size: 17px;
  color: var(--muted);
  margin-bottom: 0;
}

ul {
  margin: 0 0 14px;
  padding-left: 22px;
}

li {
  margin-bottom: 6px;
}

a {
  color: var(--accent);
  text-decoration: none;
  border-bottom: 1px solid transparent;
}

a:hover {
  border-bottom-color: currentColor;
}

.cards {
  display: grid;
  gap: 12px;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  margin: 32px 0 0;
}

.card {
  display: block;
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 18px 20px;
  color: inherit;
  transition: border-color 0.15s ease;
}

.card:hover {
  border-color: var(--accent);
  border-bottom-color: var(--accent);
}

.card strong {
  display: block;
  font-size: 16px;
  margin-bottom: 2px;
}

.card span {
  color: var(--muted);
  font-size: 14px;
}

.meta {
  color: var(--muted);
  font-size: 14px;
}

hr {
  border: 0;
  border-top: 1px solid var(--line);
  margin: 40px 0;
}

footer {
  margin-top: 48px;
  padding-top: 20px;
  border-top: 1px solid var(--line);
  color: var(--muted);
  font-size: 14px;
}

footer a {
  color: var(--muted);
}

@media (max-width: 480px) {
  body {
    padding: 32px 16px 56px;
  }

  h1 {
    font-size: 24px;
  }
}