:root {
  --ink: #0f172a;
  --muted: #475569;
  --line: #e2e8f0;
  --bg: #f8fafc;
  --accent: #047857; /* drilling green */
  --card: #ffffff;
}
* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  color: var(--ink);
  background: var(--bg);
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
}
.wrap { max-width: 760px; margin: 0 auto; padding: 0 20px; }

/* Header */
header.site {
  background: var(--ink);
  color: #fff;
  padding: 18px 0;
}
header.site .wrap { display: flex; align-items: center; justify-content: space-between; }
.brand { display: flex; align-items: center; gap: 10px; font-weight: 700; letter-spacing: .2px; }
.brand .dot { width: 12px; height: 12px; border-radius: 50%; background: var(--accent); }
header.site nav a { color: #cbd5e1; text-decoration: none; font-size: 14px; margin-left: 18px; }
header.site nav a:hover { color: #fff; }

/* Hero */
.hero { padding: 64px 0 40px; text-align: center; }
.hero h1 { font-size: 40px; line-height: 1.1; margin: 0 0 12px; }
.hero p { font-size: 18px; color: var(--muted); max-width: 560px; margin: 0 auto; }

/* Features */
.features { display: grid; grid-template-columns: repeat(auto-fit, minmax(220px, 1fr)); gap: 16px; padding: 24px 0 48px; }
.feature { background: var(--card); border: 1px solid var(--line); border-radius: 14px; padding: 20px; }
.feature h3 { margin: 0 0 6px; font-size: 16px; }
.feature p { margin: 0; color: var(--muted); font-size: 14px; }

/* Document pages */
.doc { background: var(--card); border: 1px solid var(--line); border-radius: 14px; padding: 32px; margin: 40px 0; }
.doc h1 { font-size: 28px; margin: 0 0 4px; }
.doc .updated { color: var(--muted); font-size: 14px; margin: 0 0 24px; }
.doc h2 { font-size: 18px; margin: 28px 0 8px; }
.doc p, .doc li { color: #334155; }
.doc ul { padding-left: 20px; }
.doc a { color: var(--accent); }

/* Footer */
footer.site { border-top: 1px solid var(--line); padding: 24px 0; color: var(--muted); font-size: 13px; text-align: center; }
footer.site a { color: var(--muted); }