:root {
  color-scheme: light dark;
  --bg: #ffffff;
  --fg: #1b1c1e;
  --muted: #5a5f66;
  --accent: #2e6b4f;
  --border: #dfe3e8;
  --card: #f6f8f7;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #16181a;
    --fg: #e8eaed;
    --muted: #a4abb3;
    --accent: #7fd1a6;
    --border: #2f3439;
    --card: #1e2226;
  }
}

* { box-sizing: border-box; }

body {
  margin: 0;
  padding: 0 16px 48px;
  background: var(--bg);
  color: var(--fg);
  font: 16px/1.6 -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
}

header, main, footer { max-width: 760px; margin: 0 auto; }

header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  flex-wrap: wrap;
  padding: 20px 0 16px;
  border-bottom: 1px solid var(--border);
  margin-bottom: 24px;
}

.brand { font-weight: 700; font-size: 20px; color: var(--fg); text-decoration: none; }

nav a { color: var(--muted); text-decoration: none; margin-left: 16px; font-size: 15px; }
nav a:hover { color: var(--accent); }

h1 { font-size: 28px; line-height: 1.25; margin: 8px 0 16px; }
h2 { font-size: 22px; margin: 32px 0 12px; }
h3 { font-size: 18px; margin: 24px 0 8px; }

p, li { margin: 0 0 10px; }

ul { padding-left: 4px; list-style: none; }
li { padding-left: 24px; position: relative; }
li::before { content: "•"; position: absolute; left: 6px; color: var(--accent); }
.num { color: var(--muted); margin-right: 2px; }

blockquote {
  margin: 0 0 16px;
  padding: 12px 16px;
  background: var(--card);
  border-left: 3px solid var(--accent);
  border-radius: 8px;
  color: var(--muted);
  font-size: 15px;
}

table { width: 100%; border-collapse: collapse; margin: 0 0 16px; font-size: 15px; }
th, td { border: 1px solid var(--border); padding: 8px 10px; text-align: left; vertical-align: top; }
th { background: var(--card); }

hr { border: 0; border-top: 1px solid var(--border); margin: 28px 0; }

a { color: var(--accent); }

.card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 16px 20px;
  margin: 0 0 16px;
}

.muted { color: var(--muted); font-size: 15px; }

footer {
  margin-top: 40px;
  padding-top: 16px;
  border-top: 1px solid var(--border);
  color: var(--muted);
  font-size: 14px;
}