:root {
  --green: #2E944F;
  --green-dark: #22783E;
  --ink: #16241b;
  --muted: #5b6b60;
  --bg: #f6faf7;
  --card: #ffffff;
  --line: #e2ebe5;
}
@media (prefers-color-scheme: dark) {
  :root { --ink: #e9f3ec; --muted: #9db3a4; --bg: #0f1712; --card: #17221b; --line: #26352b; }
}
* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  font: 17px/1.55 -apple-system, BlinkMacSystemFont, "SF Pro Text", "Segoe UI", Roboto, sans-serif;
  color: var(--ink);
  background: var(--bg);
}
a { color: var(--green); }
.wrap { max-width: 960px; margin: 0 auto; padding: 0 22px; }

header.site { padding: 18px 0; }
header.site .wrap { display: flex; align-items: center; justify-content: space-between; }
.brand { display: flex; align-items: center; gap: 10px; font-weight: 700; font-size: 20px; color: var(--ink); text-decoration: none; }
.brand img { width: 40px; height: 40px; }

.hero { text-align: center; padding-top: 56px; padding-bottom: 40px; }
.hero .mark { width: 132px; height: 132px; border-radius: 30px; box-shadow: 0 12px 32px rgba(34,120,62,.28); }
.hero h1 { font-size: clamp(36px, 7vw, 56px); line-height: 1.08; margin: 26px 0 12px; letter-spacing: -0.02em; }
.hero p.lead { font-size: clamp(18px, 2.6vw, 22px); color: var(--muted); max-width: 620px; margin: 0 auto 26px; }
.badge {
  display: inline-block; padding: 10px 18px; border-radius: 999px;
  background: var(--green); color: #fff; font-weight: 600; font-size: 15px;
}

.features { display: grid; grid-template-columns: repeat(auto-fit, minmax(210px, 1fr)); gap: 16px; padding-top: 24px; padding-bottom: 56px; }
.feature { background: var(--card); border: 1px solid var(--line); border-radius: 18px; padding: 22px; }
.feature .icon { font-size: 26px; line-height: 1; }
.feature h3 { margin: 12px 0 6px; font-size: 18px; }
.feature p { margin: 0; color: var(--muted); font-size: 15.5px; }

.how { background: var(--card); border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); padding: 48px 0; }
.how h2 { text-align: center; margin: 0 0 24px; font-size: 28px; }
.how ol { max-width: 620px; margin: 0 auto; padding-left: 22px; }
.how li { margin: 10px 0; }

article.doc { max-width: 720px; margin: 0 auto; padding: 24px 22px 64px; }
article.doc h1 { font-size: 34px; margin-bottom: 4px; }
article.doc .updated { color: var(--muted); margin-top: 0; }
article.doc h2 { font-size: 21px; margin-top: 32px; }

footer.site { padding: 32px 0 44px; color: var(--muted); font-size: 14px; text-align: center; }
footer.site nav a { margin: 0 10px; }
footer.site p { margin: 10px 0 0; }