:root {
  --bg: #070b14;
  --bg-card: #121a2e;
  --text: #f1f5ff;
  --muted: #b8c4dc;
  --accent: #7488ee;
  --line: #1e2a42;
  --max: 720px;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
  font-size: 17px;
}
a { color: var(--accent); }
header {
  border-bottom: 1px solid var(--line);
  background: #0b1224;
  position: sticky;
  top: 0;
  z-index: 2;
}
.wrap { max-width: var(--max); margin: 0 auto; padding: 20px; }
.brand { font-weight: 800; letter-spacing: -0.3px; color: var(--text); text-decoration: none; }
nav { display: flex; gap: 16px; flex-wrap: wrap; margin-top: 10px; }
nav a { color: var(--muted); text-decoration: none; font-size: 14px; font-weight: 600; }
nav a:hover, nav a.active { color: var(--accent); }
h1 { font-size: 28px; line-height: 1.2; letter-spacing: -0.4px; margin: 8px 0 12px; }
h2 { font-size: 20px; margin: 28px 0 8px; }
p, li { color: var(--muted); }
ul { padding-left: 1.2em; }
.card {
  background: var(--bg-card);
  border: 1px solid var(--line);
  border-radius: 16px;
  padding: 16px 18px;
  margin: 16px 0;
}
.btn {
  display: inline-block;
  background: #5068e8;
  color: #fff;
  text-decoration: none;
  font-weight: 800;
  padding: 12px 18px;
  border-radius: 12px;
  margin: 8px 8px 0 0;
}
footer {
  border-top: 1px solid var(--line);
  margin-top: 40px;
  padding: 24px 0 40px;
  color: var(--muted);
  font-size: 14px;
}
.note { font-size: 14px; }
code { font-size: 0.92em; color: var(--text); }