:root{--bg:#fff;--ink:#14201d;--muted:#5b6b66;--line:#e3eae7;--brand:#0e7c66;--dark:#0a5f4f;--soft:#eef7f4;--card:#f8faf9;--warn:#fff7e8;--r:16px}
*{box-sizing:border-box;margin:0;padding:0}html{scroll-behavior:smooth}
body{font-family:-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,Arial,sans-serif;color:var(--ink);line-height:1.7;background:var(--bg)}
a{color:var(--dark)}.wrap{max-width:1080px;margin:0 auto;padding:0 20px}
header{position:sticky;top:0;background:rgba(255,255,255,.95);backdrop-filter:blur(8px);border-bottom:1px solid var(--line);z-index:10}
.nav{display:flex;align-items:center;justify-content:space-between;min-height:64px;flex-wrap:wrap;gap:8px}
.logo{font-weight:800;font-size:22px;color:var(--ink);text-decoration:none}.logo span{color:var(--brand)}
.nav nav a{margin-left:18px;text-decoration:none;color:var(--muted);font-size:15px}.nav nav a:hover{color:var(--ink)}
@media(max-width:760px){.nav nav a{margin-left:10px;font-size:14px}}
.hero{padding:64px 0 48px;text-align:center;background:linear-gradient(180deg,var(--soft),#fff)}
.hero h1,.pagehead h1{font-size:42px;line-height:1.15;letter-spacing:-.5px}.hero h1 em{font-style:normal;color:var(--brand)}
.hero p.lead,.pagehead p.lead{max-width:740px;margin:16px auto 0;font-size:18.5px;color:var(--muted)}
.pagehead{padding:48px 0 8px}.pagehead p.lead{margin-left:0}
.badge{display:inline-block;background:#fff;border:1px solid var(--line);border-radius:999px;padding:5px 13px;font-size:13.5px;margin:3px}
.badges{margin:20px 0 4px}
.btn{display:inline-block;background:var(--brand);color:#fff;text-decoration:none;font-weight:700;padding:13px 26px;border-radius:12px;margin:12px 6px 0;font-size:16px}
.btn:hover{background:var(--dark)}.btn.ghost{background:#fff;color:var(--dark);border:1.5px solid var(--brand)}
.note,.small{font-size:13.5px;color:var(--muted)}.note{margin-top:12px}
section{padding:48px 0}section.alt{background:var(--card);border-top:1px solid var(--line);border-bottom:1px solid var(--line)}
h2{font-size:28px;letter-spacing:-.3px;margin-bottom:10px}h3{font-size:18px}
.sub{color:var(--muted);max-width:780px;margin-bottom:26px}
p{margin:10px 0}.content p,.content li{font-size:16.5px}.content ul,.content ol{margin:10px 0 10px 22px}.content li{margin:6px 0}
.grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(240px,1fr));gap:16px}
.card{background:#fff;border:1px solid var(--line);border-radius:var(--r);padding:20px}.card p{font-size:15px;color:var(--muted);margin:4px 0}
.card a{text-decoration:none}.card a:hover{text-decoration:underline}
.def{background:#fff;border:1px solid var(--line);border-radius:var(--r);padding:24px}.def ol{margin:8px 0 0 20px}.def li{margin:8px 0}
.step{display:flex;gap:16px;margin:16px 0}.step .n{flex:0 0 38px;height:38px;border-radius:50%;background:var(--brand);color:#fff;font-weight:800;display:flex;align-items:center;justify-content:center}
.step p{color:var(--muted);font-size:15.5px;margin:2px 0}
table{width:100%;border-collapse:collapse;background:#fff;border:1px solid var(--line);font-size:15px;margin:14px 0}
th,td{padding:11px 14px;text-align:left;border-bottom:1px solid var(--line);vertical-align:top}th{background:var(--soft)}tr:last-child td{border-bottom:none}
code{background:#eef2f0;border-radius:6px;padding:2px 7px;font-family:ui-monospace,Menlo,Consolas,monospace;font-size:14px}
pre{background:#10201b;color:#d9f2e8;border-radius:12px;padding:18px;overflow-x:auto;font-size:14px;line-height:1.55;margin:12px 0}pre code{background:none;color:inherit;padding:0}
.warn{background:var(--warn);border:1px solid #f0dfba;border-radius:var(--r);padding:20px 22px;margin:16px 0}
.two{display:grid;grid-template-columns:1fr 1fr;gap:16px}@media(max-width:720px){.two{grid-template-columns:1fr}.hero h1,.pagehead h1{font-size:32px}}
ul.clean{list-style:none}ul.clean li{padding:6px 0 6px 24px;position:relative;font-size:15.5px}
ul.clean li::before{content:"\2713";position:absolute;left:0;color:var(--brand);font-weight:800}ul.clean.no li::before{content:"\2715";color:#c0392b}
details{border:1px solid var(--line);border-radius:12px;background:#fff;margin:10px 0;padding:4px 18px}
summary{cursor:pointer;font-weight:700;padding:12px 0;font-size:16px}details p{padding:0 0 14px;color:var(--muted);font-size:15.5px;margin:0}
.dl-box{background:#10201b;color:#eafaf3;border-radius:20px;padding:34px;text-align:center}.dl-box h2{color:#fff}.dl-box p{color:#bfe3d6;max-width:640px;margin:0 auto}
.dl-box .btn{background:#fff;color:var(--dark)}.dl-box .btn.ghost{background:transparent;color:#fff;border-color:#fff}
.crumbs{font-size:14px;color:var(--muted);padding-top:22px}.crumbs a{color:var(--muted)}
.related{margin-top:34px;border-top:1px solid var(--line);padding-top:20px}
footer{border-top:1px solid var(--line);padding:38px 0;color:var(--muted);font-size:14.5px;background:var(--card)}
footer .cols{display:grid;grid-template-columns:repeat(auto-fit,minmax(170px,1fr));gap:20px;margin-bottom:20px}
footer h4{color:var(--ink);font-size:15px;margin-bottom:8px}footer ul{list-style:none}footer li{margin:5px 0}footer a{color:var(--muted);text-decoration:none}footer a:hover{text-decoration:underline}
.toc{background:var(--soft);border:1px solid var(--line);border-radius:var(--r);padding:18px 22px;margin:26px 0}
.toc-h{font-weight:800;font-size:17px;margin:0 0 8px}.toc ol{margin:0 0 0 20px}.toc li{margin:5px 0;font-size:15.5px}
figure.diagram{margin:22px 0;border:1px solid var(--line);border-radius:var(--r);padding:16px;background:#fff}
figure.diagram img{width:100%;height:auto;display:block}
figure.diagram figcaption{font-size:14px;color:var(--muted);margin-top:10px}
.share{border-top:1px solid var(--line);margin-top:26px;padding-top:16px;font-size:15.5px}.share a{margin:0 5px}
.refs ul{margin:10px 0 10px 22px}.refs li{margin:6px 0}
.logo-img{vertical-align:-9px;margin-right:8px;border-radius:8px}
.hero-img{width:100%;max-width:900px;height:auto;display:block;margin:28px auto 6px}
.phone-fig{max-width:330px;margin:24px auto}.phone-fig img{width:100%;height:auto}
img.featured{width:100%;height:auto;border-radius:14px}
.byline{font-size:.86rem;color:var(--muted);margin-top:10px}