:root {
  --bg: #0d1116;
  --text: #eef3f7;
  --muted: #b8c5cf;
  --surface: #151d25;
  --line: rgba(255, 255, 255, 0.08);
  --accent: #2ea66a;
  --max: 980px;
}
* { box-sizing: border-box; }
body {
  margin: 0;
  font-family: "Segoe UI", Arial, sans-serif;
  color: var(--text);
  background: var(--bg);
  line-height: 1.6;
}
.container { width: min(var(--max), 92%); margin: 0 auto; }
header {
  padding: 26px 0;
  border-bottom: 1px solid var(--line);
  background: #0a0e13;
}
.back {
  color: #a8d6ff;
  text-decoration: none;
  font-weight: 600;
}
h1 { margin: 8px 0 0; font-size: clamp(1.8rem, 3.8vw, 2.8rem); }
h2 { margin: 0 0 8px; font-size: clamp(1.35rem, 2.8vw, 1.9rem); }
.sub { color: var(--muted); margin: 0; max-width: 760px; }
section { padding: 36px 0; border-bottom: 1px solid var(--line); }
.grid {
  display: grid;
  gap: 14px;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
}
.card {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 16px;
}
.card h3 { margin: 0 0 6px; font-size: 1.05rem; }
.card p { margin: 0; color: var(--muted); }
ul { margin: 0; padding-left: 18px; color: var(--muted); }
footer { padding: 18px 0 28px; color: var(--muted); }
.footer-note { margin: 8px 0 0; font-size: 0.86rem; }
.footer-note a {
  color: #a8d6ff;
  text-decoration: none;
  margin-left: 8px;
}
.cta {
  display: inline-block;
  margin-top: 14px;
  text-decoration: none;
  background: var(--accent);
  color: #0d1116;
  font-weight: 700;
  border-radius: 8px;
  padding: 10px 16px;
}