/* kaiiian style · v3.2.1 */
:root{--ink:#1a1f2b;--sub:#5b6472;--line:#e6e9ef;--card:#ffffff;--bg:#f4f6fa;--brand:#1864e0;--brand2:#0d47a1;--radius:13px;--shadow:0 3px 16px rgba(20,40,80,.08)}
*{box-sizing:border-box;margin:0;padding:0}
html{-webkit-text-size-adjust:100%}
body{font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Microsoft YaHei",sans-serif;color:var(--ink);background:var(--bg);line-height:1.72;font-size:15.5px}
a{color:var(--brand);text-decoration:none}
a:hover{color:var(--brand2)}
ul{list-style:none}
img{max-width:100%;display:block}
h1,h2,h3,h4{line-height:1.28;font-weight:700;color:var(--ink)}
h1{font-size:34px;letter-spacing:-.5px}
h2{font-size:23px}
h3{font-size:17px}
.wrap{max-width:1120px;margin:0 auto;padding:0 22px}
/* topbar */
.mh{background:#fff;border-bottom:1px solid var(--line);position:sticky;top:0;z-index:50;backdrop-filter:blur(6px);background:rgba(255,255,255,.92)}
.mh-row{display:flex;align-items:center;justify-content:space-between;height:62px}
.bd{font-size:21px;font-weight:800;color:var(--ink);letter-spacing:-.3px}
.bd span{color:var(--brand)}
.mh-nav{display:flex;gap:22px}
.mh-nav a{color:var(--sub);font-size:14.5px;font-weight:500}
.mh-nav a:hover,.mh-nav a.nv{color:var(--ink)}
.mh-go{background:var(--brand);color:#fff!important;padding:8px 16px;border-radius:9px;font-size:14px;font-weight:600}
.mh-go:hover{background:var(--brand2);color:#fff!important}
/* breadcrumb */
.br{padding:11px 22px;font-size:13px;color:var(--sub);max-width:1120px;margin:0 auto}
.br a{color:var(--sub)}
.br a:hover{color:var(--brand)}
/* hero */
.hp{background:linear-gradient(160deg,#0d2b5e 0%,#1864e0 62%,#3d8aff 100%);color:#fff;padding:64px 0 56px}
.hp .wrap{position:relative}
.hp h1{color:#fff;font-size:38px;max-width:760px}
.hp-em{color:#a8d4ff;font-weight:700}
.hp-sub{margin:18px 0 24px;font-size:16.5px;max-width:640px;color:rgba(255,255,255,.9);line-height:1.7}
.hp-act{display:flex;gap:13px;flex-wrap:wrap}
.bt{display:inline-block;padding:12px 23px;border-radius:10px;font-size:15px;font-weight:600;transition:.15s}
.bt-a{background:#fff;color:var(--brand)}
.bt-a:hover{background:#eef4ff;color:var(--brand2)}
.bt-b{background:rgba(255,255,255,.16);color:#fff;border:1px solid rgba(255,255,255,.4)}
.bt-b:hover{background:rgba(255,255,255,.26);color:#fff}
.hp-note{margin-top:20px;font-size:13px;color:rgba(255,255,255,.75)}
/* section */
section{padding:48px 0}
.tt{text-align:center;margin-bottom:30px}
.tt h2{margin-bottom:8px}
.tt p{color:var(--sub);font-size:14.5px}
/* steps */
.sp{display:grid;grid-template-columns:repeat(3,1fr);gap:18px}
.sp-i{background:var(--card);border:1px solid var(--line);border-radius:var(--radius);padding:22px}
.sp-n{font-size:26px;font-weight:800;color:var(--brand);opacity:.8}
.sp-i h3{margin:8px 0 6px}
.sp-i p{font-size:14px;color:var(--sub);line-height:1.65}
/* grid/scene */
.gd{display:grid;gap:18px}
.gd3{grid-template-columns:repeat(3,1fr)}
.sc{background:var(--card);border:1px solid var(--line);border-radius:var(--radius);padding:20px}
.sc h3{margin-bottom:7px}
.sc p{font-size:14px;color:var(--sub);line-height:1.66}
/* download box */
.dlb{background:var(--card);border:1px solid var(--line);border-radius:var(--radius);padding:28px;text-align:center;box-shadow:var(--shadow)}
.dlb-v{font-size:13px;color:var(--sub);margin-bottom:6px}
.dlb h2{margin-bottom:10px}
.dlb-ok{margin:14px 0 18px;color:#1a7f3c;font-size:14px;font-weight:600}
.dlb-row{display:flex;gap:13px;flex-wrap:wrap;justify-content:center}
.dlb-x{display:flex;flex-direction:column;gap:3px;background:var(--bg);border:1px solid var(--line);border-radius:11px;padding:14px 20px;color:var(--ink);min-width:150px;align-items:flex-start}
.dlb-x:hover{background:#eef4ff;border-color:var(--brand);color:var(--ink)}
.dlb-os{font-size:13px;font-weight:700}
.dlb-nm{font-size:12.5px;color:var(--brand)}
.dlb-sz{font-size:11.5px;color:var(--sub)}
/* feature */
.ft{display:flex;gap:15px;background:var(--card);border:1px solid var(--line);border-radius:var(--radius);padding:18px;margin-bottom:12px;align-items:flex-start}
.ft-ic{font-size:22px;width:38px;height:38px;display:flex;align-items:center;justify-content:center;background:#eef4ff;border-radius:9px;flex-shrink:0}
.ft h3{margin-bottom:5px}
.ft p{font-size:14px;color:var(--sub);line-height:1.66}
/* news */
.ng{display:grid;grid-template-columns:repeat(3,1fr);gap:18px}
.nc{background:var(--card);border:1px solid var(--line);border-radius:var(--radius);overflow:hidden;color:var(--ink);display:flex;flex-direction:column;transition:.15s}
.nc:hover{transform:translateY(-3px);box-shadow:var(--shadow);color:var(--ink)}
.nc-img{height:130px;position:relative;display:flex;align-items:flex-end;padding:12px}
.nc-tag{background:rgba(255,255,255,.22);color:#fff;font-size:11.5px;padding:3px 10px;border-radius:20px;backdrop-filter:blur(2px);border:1px solid rgba(255,255,255,.35)}
.nc-bd{padding:14px 16px;flex:1;display:flex;flex-direction:column}
.nc-d{font-size:12px;color:var(--sub);margin-bottom:5px}
.nc-bd h3{font-size:15px;margin-bottom:7px;line-height:1.35}
.nc-bd p{font-size:13px;color:var(--sub);line-height:1.55;flex:1}
.nc-m{margin-top:10px;font-size:13px;color:var(--brand);font-weight:600}
/* faq */
.fg{display:grid;grid-template-columns:repeat(2,1fr);gap:16px}
.fc{background:var(--card);border:1px solid var(--line);border-radius:var(--radius);padding:18px}
.fc-q{font-weight:700;font-size:15.5px;margin-bottom:11px;display:flex;align-items:center;gap:9px;line-height:1.4}
.fc-b{background:var(--brand);color:#fff;font-size:11.5px;padding:2px 8px;border-radius:6px;font-weight:700;flex-shrink:0}
.fc-a{display:flex;flex-direction:column;gap:8px}
.fc-s{display:flex;gap:9px;align-items:flex-start;font-size:13.5px;color:var(--sub);line-height:1.6}
.fc-sn{background:#eef4ff;color:var(--brand);font-size:11.5px;font-weight:700;width:20px;height:20px;display:flex;align-items:center;justify-content:center;border-radius:50%;flex-shrink:0;margin-top:1px}
/* trust bar */
.tb{display:grid;grid-template-columns:repeat(4,1fr);gap:16px;background:var(--card);border:1px solid var(--line);border-radius:var(--radius);padding:22px;text-align:center;margin-bottom:26px}
.tb-i{display:flex;flex-direction:column;gap:4px}
.tb-n{font-size:25px;font-weight:800;color:var(--brand)}
.tb-l{font-size:12.5px;color:var(--sub)}
.cx{display:flex;gap:13px;flex-wrap:wrap;justify-content:center}
.cx-mt{margin-top:8px}
/* author */
.abx{display:flex;gap:13px;align-items:center;background:var(--card);border:1px solid var(--line);border-radius:var(--radius);padding:16px;margin:22px 0}
.abx-av{width:42px;height:42px;border-radius:50%;background:var(--brand);color:#fff;display:flex;align-items:center;justify-content:center;font-size:18px;font-weight:700;flex-shrink:0}
.abx-tx h4{font-size:14px;margin-bottom:3px}
.abx-tx div{font-size:12.5px;color:var(--sub);line-height:1.55}
/* related */
.rl{background:var(--card);border:1px solid var(--line);border-radius:var(--radius);padding:18px 22px;margin:18px 0}
.rl h3{font-size:15px;margin-bottom:9px}
.rl ul{display:flex;flex-direction:column;gap:7px}
.rl li{font-size:14px;line-height:1.6}
.rl li a{color:var(--brand)}
.rl li b{color:var(--ink)}
/* footer */
.ftr{background:#0d2b5e;color:rgba(255,255,255,.8);padding:40px 0 24px;margin-top:30px}
.ftr-c{display:grid;grid-template-columns:repeat(4,1fr);gap:22px;margin-bottom:24px}
.ftr h4{color:#fff;font-size:14.5px;margin-bottom:11px}
.ftr ul{display:flex;flex-direction:column;gap:7px}
.ftr ul li{font-size:13px;line-height:1.55}
.ftr ul li a{color:rgba(255,255,255,.75)}
.ftr ul li a:hover{color:#fff}
.ftr-b{display:flex;justify-content:space-between;font-size:12.5px;color:rgba(255,255,255,.55);border-top:1px solid rgba(255,255,255,.12);padding-top:16px}
/* article */
.art{background:var(--card);border:1px solid var(--line);border-radius:var(--radius);padding:26px 28px;margin-bottom:8px}
.art p{font-size:15px;color:var(--ink);line-height:1.78;margin-bottom:13px}
/* misc */
.cmp th{font-weight:700;color:var(--ink)}
@media(max-width:860px){
  .sp,.gd3,.ng,.fg,.tb,.ftr-c{grid-template-columns:1fr}
  .mh-nav{display:none}
  h1,.hp h1{font-size:28px}
  section{padding:36px 0}
}
@media(max-width:520px){
  .wrap{padding:0 16px}
  .dlb-row{flex-direction:column;align-items:stretch}
  .hp{padding:44px 0 38px}
}