:root {
  --bg: #f7faf7;
  --text: #16241b;
  --muted: #5a6b60;
  --accent: #1f8a4c;
  --line: #dce7df;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0f1612;
    --text: #e8f0ea;
    --muted: #9fb2a5;
    --accent: #5fd08f;
    --line: #26352c;
  }
}
* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font: 17px/1.6 -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
}
.wrap {
  max-width: 680px;
  margin: 0 auto;
  padding: 48px 20px 64px;
}
.mark {
  margin: 0 0 56px;
  font-weight: 700;
  letter-spacing: 0.02em;
  color: var(--accent);
}
h1 { font-size: 1.9rem; line-height: 1.25; margin: 0 0 12px; }
h2 { font-size: 1.15rem; margin: 40px 0 8px; }
h3 { font-size: 1rem; margin: 28px 0 6px; }
p, li { margin: 0 0 12px; }
.en { color: var(--muted); }
a { color: var(--accent); text-underline-offset: 3px; }
footer {
  margin-top: 64px;
  padding-top: 20px;
  border-top: 1px solid var(--line);
  display: flex;
  gap: 24px;
  font-size: 0.95rem;
}
.back { display: inline-block; margin-bottom: 32px; font-size: 0.95rem; }
.small { color: var(--muted); font-size: 0.9rem; }