:root {
  --r-text: #0f172a;
  --r-muted: #64748b;
  --r-link: #16a34a;
  --r-bg: #ffffff;
  --r-border: #e2e8f0;
}
@media (prefers-color-scheme: dark) {
  :root {
    --r-text: #f8fafc;
    --r-muted: #94a3b8;
    --r-link: #34d399;
    --r-bg: #0f172a;
    --r-border: #1e293b;
  }
}
* { box-sizing: border-box; }
body {
  font-family: system-ui, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  background: var(--r-bg);
  color: var(--r-text);
  line-height: 1.65;
  max-width: 42rem;
  margin: 0 auto;
  padding: 2rem 1.25rem 4rem;
}
h1 { font-size: 1.65rem; margin: 0 0 1rem; font-weight: 700; }
h2 { font-size: 0.85rem; margin: 2rem 0 0.5rem; color: var(--r-muted); text-transform: uppercase; letter-spacing: 0.08em; font-weight: 600; }
p, ul { margin: 0.75rem 0; font-size: 0.95rem; }
ul { padding-left: 1.25rem; }
li { margin: 0.35rem 0; }
a { color: var(--r-link); }
.back {
  display: inline-block;
  margin-bottom: 1.5rem;
  font-size: 0.9rem;
  text-decoration: none;
  border-bottom: 1px solid var(--r-border);
  padding-bottom: 2px;
}
.box {
  border: 1px solid var(--r-border);
  border-radius: 8px;
  padding: 1rem 1.1rem;
  margin: 1rem 0;
  font-size: 0.9rem;
  background: rgba(148, 163, 184, 0.08);
}