:root{
  --bg:#ffffff; --bg2:#f5f7fb; --ink:#0f172a; --muted:#475569; --line:#e2e8f0;
  --brand:#0e7c66; --brand2:#0b5f4f; --accent:#f59e0b; --card:#ffffff;
  --radius:14px; --max:1080px;
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{margin:0;font-family:"Inter",system-ui,-apple-system,"Segoe UI",Roboto,Arial,sans-serif;color:var(--ink);background:var(--bg);line-height:1.6;font-size:16px}
a{color:var(--brand);text-decoration:none}
a:hover{text-decoration:underline}
img,svg{max-width:100%}
.wrap{max-width:var(--max);margin:0 auto;padding:0 20px}

/* header */
header.site{position:sticky;top:0;z-index:10;background:rgba(255,255,255,.95);backdrop-filter:blur(6px);border-bottom:1px solid var(--line)}
.nav{display:flex;align-items:center;justify-content:space-between;gap:16px;min-height:64px;flex-wrap:wrap;padding:8px 0}
.logo{display:flex;align-items:center;gap:10px;font-weight:800;font-size:19px;color:var(--ink)}
.logo:hover{text-decoration:none}
.logo .mark{width:34px;height:34px;border-radius:9px;background:linear-gradient(135deg,var(--brand),#16a37f);display:grid;place-items:center;color:#fff;font-size:16px}
.logo .ai{color:var(--brand)}
nav.links{display:flex;flex-wrap:wrap;gap:4px 18px;font-size:15px}
nav.links a{color:var(--muted);font-weight:500}
nav.links a.on{color:var(--ink);font-weight:700}
nav.links a.legal{color:var(--ink)}

/* hero */
.hero{background:linear-gradient(180deg,#eef8f5,#ffffff);padding:72px 0 56px}
.hero h1{font-size:44px;line-height:1.15;margin:0 0 16px;letter-spacing:-.02em;max-width:760px}
.hero p.lead{font-size:19px;color:var(--muted);max-width:680px;margin:0 0 26px}
.btns{display:flex;gap:12px;flex-wrap:wrap}
.btn{display:inline-block;padding:12px 20px;border-radius:10px;font-weight:700;font-size:15px}
.btn.primary{background:var(--brand);color:#fff}
.btn.primary:hover{background:var(--brand2);text-decoration:none}
.btn.ghost{border:1px solid var(--line);color:var(--ink);background:#fff}
.btn.ghost:hover{text-decoration:none;border-color:#cbd5e1}
.platforms{display:flex;gap:10px;flex-wrap:wrap;margin-top:28px}
.chip{border:1px solid var(--line);background:#fff;border-radius:999px;padding:6px 14px;font-size:14px;color:var(--muted)}

/* sections */
section{padding:56px 0}
section.alt{background:var(--bg2)}
h2{font-size:30px;margin:0 0 10px;letter-spacing:-.01em}
.sub{color:var(--muted);margin:0 0 30px;max-width:720px}
.grid{display:grid;gap:18px;grid-template-columns:repeat(auto-fit,minmax(240px,1fr))}
.card{background:var(--card);border:1px solid var(--line);border-radius:var(--radius);padding:22px}
.card h3{margin:0 0 8px;font-size:18px}
.card p{margin:0;color:var(--muted);font-size:15px}
.icon{width:40px;height:40px;border-radius:10px;background:#e6f4f0;color:var(--brand);display:grid;place-items:center;font-size:20px;margin-bottom:12px}
ol.steps{counter-reset:s;list-style:none;padding:0;margin:0;display:grid;gap:14px}
ol.steps li{counter-increment:s;position:relative;padding:18px 18px 18px 64px;background:#fff;border:1px solid var(--line);border-radius:var(--radius)}
ol.steps li::before{content:counter(s);position:absolute;left:18px;top:18px;width:30px;height:30px;border-radius:50%;background:var(--brand);color:#fff;display:grid;place-items:center;font-weight:700;font-size:14px}
ol.steps li strong{display:block;margin-bottom:2px}
ol.steps li span{color:var(--muted);font-size:15px}

/* page */
.pagehead{background:var(--bg2);border-bottom:1px solid var(--line);padding:44px 0 32px}
.pagehead h1{margin:0 0 6px;font-size:36px;letter-spacing:-.02em}
.pagehead p{margin:0;color:var(--muted)}
.prose{max-width:780px;padding:36px 0 60px}
.prose h2{font-size:22px;margin:34px 0 8px}
.prose h3{font-size:17px;margin:22px 0 6px}
.prose p,.prose li{color:#334155}
.prose ul{padding-left:22px}
.note{background:#fff8e6;border:1px solid #fde3a7;border-radius:12px;padding:14px 16px;color:#713f12;font-size:15px}
table.t{width:100%;border-collapse:collapse;font-size:15px;margin:10px 0}
table.t th,table.t td{border:1px solid var(--line);padding:10px;text-align:left;vertical-align:top}
table.t th{background:var(--bg2)}

/* footer */
footer.site{border-top:1px solid var(--line);padding:30px 0;color:var(--muted);font-size:14px}
.foot{display:flex;justify-content:space-between;gap:16px;flex-wrap:wrap}
.foot nav{display:flex;gap:16px;flex-wrap:wrap}
.foot a{color:var(--muted)}

@media (max-width:640px){
  .hero{padding:44px 0 36px}
  .hero h1{font-size:31px}
  .hero p.lead{font-size:17px}
  h2{font-size:24px}
  .pagehead h1{font-size:28px}
  nav.links{gap:4px 14px;font-size:14px}
}