:root {
  --bg: #FAFAF7;
  --surface: #FFFFFF;
  --border: #E8E6DE;
  --text: #0F1210;
  --text-secondary: #6B6E6A;
  --accent: #0FB57A;
  --accent-muted: #E5F6EE;
}
* { box-sizing: border-box; }
body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "SF Pro Rounded", "SF Pro Text", system-ui, sans-serif;
  background: var(--bg);
  color: var(--text);
  -webkit-font-smoothing: antialiased;
  line-height: 1.6;
}
a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }
nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 20px 32px;
  max-width: 1120px;
  margin: 0 auto;
}
nav .brand {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 700;
  font-size: 18px;
  color: var(--text);
}
nav .brand:hover { text-decoration: none; }
nav .leaf {
  width: 32px; height: 32px;
  background: var(--accent-muted);
  border-radius: 50%;
  display: flex; align-items: center; justify-content: center;
  color: var(--accent);
}
nav .links a { color: var(--text-secondary); margin-left: 24px; font-size: 14px; }
nav .links a.active { color: var(--text); }
article {
  max-width: 720px;
  margin: 48px auto 72px;
  padding: 0 32px;
}
article h1 {
  font-size: 44px;
  letter-spacing: -0.5px;
  margin: 0 0 8px;
  font-weight: 800;
}
article h2 {
  font-size: 22px;
  margin: 48px 0 12px;
  font-weight: 700;
}
article h3 {
  font-size: 17px;
  margin: 24px 0 8px;
  font-weight: 600;
}
article p, article li { font-size: 16px; color: var(--text); }
article .updated {
  color: var(--text-secondary);
  font-size: 14px;
  margin: 0 0 32px;
}
article ul { padding-left: 20px; }
article li { margin-bottom: 6px; }
footer {
  border-top: 1px solid var(--border);
  padding: 24px 32px;
  text-align: center;
  color: var(--text-secondary);
  font-size: 13px;
}
footer a { color: var(--text-secondary); margin: 0 12px; }
@media (max-width: 720px) {
  article h1 { font-size: 32px; }
  article { padding: 0 24px; }
}