:root{
  --green:#16B364; --green-dark:#0f8f4e; --ink:#0f1a14; --muted:#5b6b62;
  --bg:#ffffff; --bg-soft:#f4f8f5; --line:#e4ece7; --radius:16px;
  color-scheme:light;
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{
  margin:0; font-family:-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,Helvetica,Arial,sans-serif;
  color:var(--ink); background:var(--bg); line-height:1.6; -webkit-font-smoothing:antialiased;
}
a{color:var(--green-dark); text-decoration:none}
a:hover{text-decoration:underline}
.wrap{max-width:960px; margin:0 auto; padding:0 24px}
header.site{position:sticky; top:0; background:rgba(255,255,255,.85); backdrop-filter:saturate(180%) blur(12px); border-bottom:1px solid var(--line); z-index:10}
.nav{display:flex; align-items:center; justify-content:space-between; height:64px}
.brand{display:flex; align-items:center; gap:10px; font-weight:700; font-size:18px; color:var(--ink)}
.brand .dot{width:26px; height:26px; border-radius:8px; background:linear-gradient(135deg,var(--green),var(--green-dark)); display:inline-block}
.nav a.navlink{color:var(--muted); font-weight:500; margin-left:22px}
.nav a.navlink:hover{color:var(--ink); text-decoration:none}
.hero{padding:88px 0 64px; background:radial-gradient(1200px 400px at 50% -120px,#e7f6ee,transparent)}
.hero h1{font-size:clamp(32px,5vw,52px); line-height:1.08; margin:0 0 16px; letter-spacing:-.02em}
.hero p.lead{font-size:20px; color:var(--muted); max-width:620px; margin:0 0 28px}
.pill{display:inline-block; padding:6px 14px; border:1px solid var(--line); border-radius:999px; font-size:13px; font-weight:600; color:var(--green-dark); background:var(--bg-soft); margin-bottom:22px}
.btn{display:inline-block; background:var(--green); color:#fff; font-weight:600; padding:13px 22px; border-radius:12px; border:1px solid var(--green-dark)}
.btn:hover{background:var(--green-dark); text-decoration:none}
.btn.ghost{background:#fff; color:var(--ink); border:1px solid var(--line); margin-left:10px}
.section{padding:56px 0; border-top:1px solid var(--line)}
.section h2{font-size:28px; letter-spacing:-.01em; margin:0 0 8px}
.section p.sub{color:var(--muted); margin:0 0 28px; max-width:620px}
.grid{display:grid; grid-template-columns:repeat(auto-fill,minmax(220px,1fr)); gap:16px}
.card{border:1px solid var(--line); border-radius:var(--radius); padding:20px; background:#fff; transition:transform .15s ease, box-shadow .15s ease}
.card:hover{transform:translateY(-2px); box-shadow:0 10px 30px rgba(16,179,100,.08)}
.card h3{margin:0 0 4px; font-size:17px}
.card .tag{font-size:13px; color:var(--muted)}
.card .ico{width:38px; height:38px; border-radius:10px; background:var(--bg-soft); display:flex; align-items:center; justify-content:center; font-size:20px; margin-bottom:12px}
footer.site{border-top:1px solid var(--line); padding:40px 0; color:var(--muted); font-size:14px}
.footrow{display:flex; justify-content:space-between; flex-wrap:wrap; gap:16px}
.footrow a{color:var(--muted); margin-right:18px}
/* document pages */
.doc{padding:56px 0 80px; max-width:760px}
.doc h1{font-size:34px; letter-spacing:-.02em; margin:0 0 6px}
.doc .updated{color:var(--muted); margin:0 0 28px}
.doc h2{font-size:22px; margin:34px 0 8px}
.doc h3{font-size:17px; margin:22px 0 6px}
.doc ul{padding-left:20px}
.doc li{margin:6px 0}
.callout{background:var(--bg-soft); border:1px solid var(--line); border-left:4px solid var(--green); border-radius:10px; padding:14px 18px; margin:20px 0}
.faq{border:1px solid var(--line); border-radius:12px; padding:4px 18px; margin-bottom:12px; background:#fff}
.faq summary{cursor:pointer; font-weight:600; padding:14px 0; list-style:none}
.faq summary::-webkit-details-marker{display:none}
.faq[open] summary{border-bottom:1px solid var(--line)}
.faq p{color:var(--muted)}
@media(max-width:600px){.nav a.navlink{margin-left:14px}.btn.ghost{margin-left:0;margin-top:10px}}