:root{--teal:#0D7377;--ink:#1A1A1A;--bg:#EEF2F1;--w:#fff;--muted:#4A5554}
*{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth}
body{font-family:"Trebuchet MS","PingFang SC","Microsoft YaHei",sans-serif;background:var(--bg);color:var(--ink);line-height:1.75;font-size:16px}
a{color:var(--ink);text-decoration:none}
.wrap{width:min(1140px,calc(100% - 32px));margin:0 auto}
header{background:#fff;border-bottom:3px solid var(--teal)}
.bar{display:flex;align-items:center;justify-content:space-between;min-height:66px;gap:16px}
.brand{display:flex;align-items:center;gap:10px;font-weight:700;color:var(--teal)}
nav{display:flex;flex-wrap:wrap;gap:8px 14px}
nav a{font-size:14px;color:#345}
nav a:hover{color:var(--teal)}
.shell{display:grid;grid-template-columns:1.12fr .48fr;gap:28px;align-items:start;padding:28px 0 40px}
.hero{display:grid;grid-template-columns:1fr 1fr;gap:24px;align-items:center;margin-bottom:28px}
.hero h1{font-size:30px;line-height:1.3;margin-bottom:12px}
.hero p{color:var(--muted);margin-bottom:8px}
.devices{display:flex;gap:10px;align-items:flex-end;justify-content:center}
section{margin-bottom:28px}
h2{font-size:24px;margin-bottom:12px}
.lead{color:var(--muted);margin-bottom:14px}
.row{display:flex;gap:16px;background:#fff;border-left:4px solid var(--teal);padding:16px 18px;margin-bottom:12px}
.row .ico{flex:0 0 40px;color:var(--teal)}
.row h3{font-size:17px;margin-bottom:6px}
.vsteps{display:grid;gap:12px}
.vstep{display:grid;grid-template-columns:48px 1fr;gap:12px;background:#fff;border-left:4px solid var(--teal);padding:14px 16px}
.vstep .n{font-size:22px;font-weight:700;color:var(--teal)}
.hist{display:grid;grid-template-columns:1fr 1fr;gap:12px}
.card{background:#fff;border-left:4px solid var(--teal);padding:16px 18px}
.card h3{margin-bottom:8px}
.side{position:sticky;top:16px;background:#fff;border-left:4px solid var(--teal);padding:16px}
.side h3{font-size:16px;margin-bottom:10px;color:var(--teal)}
.side li{list-style:none;margin:0 0 8px;padding-left:0;color:var(--muted);font-size:14px}
.side a{color:var(--teal);display:block;margin:6px 0;font-size:14px}
.faq details{background:#fff;border-left:4px solid var(--teal);padding:12px 16px;margin-bottom:8px}
.faq summary{cursor:pointer;font-weight:700}
.faq details p{margin-top:8px;color:var(--muted)}
footer{background:#1A1A1A;color:#D7DEDD;padding:22px 0}
.fbar{display:flex;justify-content:space-between;gap:20px;align-items:flex-start}
footer .brand-f{color:#fff;font-weight:700}
footer p{font-size:13px;margin-bottom:6px}
@media (max-width:900px){.shell,.hero,.hist,.fbar{grid-template-columns:1fr;display:block}.devices{margin-top:16px}}