:root {
  --bg: #f6f8fb;
  --card: #ffffff;
  --text: #111827;
  --muted: #6b7280;
  --accent: #008080;
  --border: #e5e7eb;
}

* { box-sizing: border-box; }
body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  color: var(--text);
  background: var(--bg);
}

.container {
  max-width: 900px;
  margin: 0 auto;
  padding: 24px;
}

.card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 16px;
  padding: 24px;
}

h1, h2, h3 { margin-top: 0; }
h1 { font-size: 2rem; margin-bottom: 8px; }
h2 { margin-top: 24px; font-size: 1.3rem; }
p, li { line-height: 1.55; color: var(--text); }
ul { padding-left: 20px; }

.muted { color: var(--muted); }
.badge {
  display: inline-block;
  background: #e6f3f3;
  color: var(--accent);
  border-radius: 999px;
  padding: 6px 10px;
  font-size: 12px;
  font-weight: 600;
  margin-bottom: 8px;
}

.topnav {
  display: flex;
  gap: 16px;
  margin-bottom: 20px;
}

a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }

code {
  background: #f3f4f6;
  border-radius: 6px;
  padding: 2px 6px;
}