:root {
  --bg: #ffffff;
  --surface: #f5f7f6;
  --text: #17201c;
  --muted: #55615b;
  --line: #dde3e0;
  --brand: #11734b;
  --brand-ink: #ffffff;
  --max: 64rem;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0f1412;
    --surface: #171e1b;
    --text: #e7ece9;
    --muted: #a3b0aa;
    --line: #2a3430;
    --brand: #4cc28c;
    --brand-ink: #08130e;
  }
}
* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font: 17px/1.6 system-ui, -apple-system, "Segoe UI", Roboto, "Noto Sans", sans-serif;
}
a { color: var(--brand); }
.wrap { max-width: var(--max); margin: 0 auto; padding: 0 16px; }

header.site { border-bottom: 1px solid var(--line); }
header.site .wrap { display: flex; flex-wrap: wrap; align-items: center; justify-content: space-between; gap: 8px 24px; padding-top: 14px; padding-bottom: 14px; }
.logo { font-weight: 700; font-size: 1.25rem; color: var(--text); text-decoration: none; letter-spacing: -0.01em; }
.logo span { color: var(--brand); }
nav a { color: var(--muted); text-decoration: none; margin-left: 18px; }
nav a:first-child { margin-left: 0; }
nav a:hover, nav a[aria-current="page"] { color: var(--text); }

.hero { padding: 64px 0 40px; }
.hero h1 { font-size: clamp(2rem, 5vw, 3rem); line-height: 1.15; margin: 0 0 16px; letter-spacing: -0.02em; }
.hero p.lead { font-size: 1.2rem; color: var(--muted); max-width: 40rem; margin: 0 0 28px; }
.btn { display: inline-block; background: var(--brand); color: var(--brand-ink); padding: 12px 22px; border-radius: 8px; text-decoration: none; font-weight: 600; min-height: 44px; }
.note { color: var(--muted); font-size: 0.95rem; margin-top: 12px; }

section { padding: 40px 0; border-top: 1px solid var(--line); }
section h2 { font-size: 1.6rem; margin: 0 0 20px; }
.grid { display: grid; gap: 16px; grid-template-columns: repeat(auto-fit, minmax(18rem, 1fr)); }
.card { background: var(--surface); border: 1px solid var(--line); border-radius: 10px; padding: 20px; }
.card h3 { margin: 0 0 8px; font-size: 1.1rem; }
.card p { margin: 0; color: var(--muted); }
.promise { background: var(--surface); border-left: 4px solid var(--brand); padding: 20px; border-radius: 6px; }
.promise ul { margin: 8px 0 0; padding-left: 20px; }

.doc { padding: 40px 0 56px; max-width: 46rem; }
.doc h1 { font-size: 2rem; margin: 0 0 4px; }
.doc .updated { color: var(--muted); margin: 0 0 28px; }
.doc h2 { font-size: 1.25rem; margin: 32px 0 8px; }
.doc li { margin-bottom: 6px; }
dl.details { display: grid; grid-template-columns: max-content 1fr; gap: 8px 20px; }
dl.details dt { color: var(--muted); }
dl.details dd { margin: 0; }
@media (max-width: 480px) {
  dl.details { grid-template-columns: 1fr; }
  dl.details dd { margin-bottom: 10px; }
}

footer.site { border-top: 1px solid var(--line); background: var(--surface); color: var(--muted); font-size: 0.95rem; }
footer.site .wrap { padding-top: 28px; padding-bottom: 28px; display: grid; gap: 20px; grid-template-columns: repeat(auto-fit, minmax(14rem, 1fr)); }
footer.site strong { color: var(--text); }
footer.site p { margin: 0 0 4px; }
footer.site a { color: var(--muted); }