:root{
  --blue:#2a86d1;
  --blue2:#1f73be;
  --bg:#eef1f5;
  --text:#2b2f33;
  --muted:#5f6b76;
  --card:#ffffff;
  --line:#dfe6ee;
}

*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{
  margin:0;
  font-family: Arial, Helvetica, "Microsoft YaHei", sans-serif;
  background:var(--bg);
  color:var(--text);
  line-height:1.95;
}

.skip{
  position:absolute; left:-999px; top:auto;
  width:1px; height:1px; overflow:hidden;
}
.skip:focus{
  left:12px; top:12px; width:auto; height:auto;
  padding:10px 12px;
  background:#fff;
  border:1px solid var(--line);
  border-radius:10px;
  z-index:99;
}

.hero{
  background:var(--blue);
  color:#fff;
  text-align:center;
  padding:46px 18px 26px;
}
.hero__inner{ max-width:1080px; margin:0 auto; }
.hero__title{
  margin:0;
  font-size:30px;
  font-weight:800;
  letter-spacing:.2px;
}
.hero__sub{
  margin:10px 0 18px;
  opacity:.95;
  font-size:14px;
}
.hero__nav{
  display:flex;
  flex-wrap:wrap;
  justify-content:center;
  gap:10px 14px;
  padding:8px 0 0;
}
.hero__nav a{
  color:#fff;
  text-decoration:none;
  font-size:13px;
  padding:4px 2px;
  opacity:.96;
}
.hero__nav a:hover{ text-decoration:underline; }

.wrap{
  width:92%;
  max-width:980px;
  margin:26px auto 48px;
}

.card{
  background:var(--card);
  border:1px solid var(--line);
  border-radius:12px;
  padding:34px 34px;
  margin:18px 0;
}

.h2{
  margin:0 0 18px;
  color:var(--blue2);
  border-left:5px solid var(--blue2);
  padding-left:12px;
  font-size:20px;
}
.h3{
  margin:18px 0 10px;
  font-size:15px;
  color:var(--text);
}

.note{
  margin-top:10px;
  color:var(--muted);
  font-size:13px;
}

.toc__grid{
  display:grid;
  grid-template-columns:repeat(2, minmax(0,1fr));
  gap:10px 16px;
}
.toc__grid a{
  text-decoration:none;
  color:var(--blue2);
  font-size:13px;
}
.toc__grid a:hover{ text-decoration:underline; }

.twoCol{
  display:grid;
  grid-template-columns:1fr 1fr;
  gap:22px;
  align-items:start;
}

.bullets{
  margin:0;
  padding-left:18px;
}
.bullets li{ margin:8px 0; }

.steps{
  margin:0;
  padding-left:18px;
}
.steps li{ margin:10px 0; }

.tableWrap{
  overflow:auto;
  border:1px solid var(--line);
  border-radius:12px;
}
.table{
  width:100%;
  border-collapse:collapse;
  min-width:520px;
}
.table th,.table td{
  border-bottom:1px solid var(--line);
  padding:12px 12px;
  text-align:left;
  vertical-align:top;
  font-size:13px;
}
.table th{
  width:160px;
  color:#334;
  background:#f4f7fb;
  font-weight:800;
}

.faq{
  border-top:1px solid var(--line);
}
.faq__q{
  width:100%;
  text-align:left;
  background:#fff;
  border:none;
  border-bottom:1px solid var(--line);
  padding:14px 12px;
  font-size:14px;
  cursor:pointer;
  display:flex;
  justify-content:space-between;
  align-items:center;
}
.faq__q:hover{ background:#f7faff; }
.faq__icon{
  display:inline-flex;
  width:22px;height:22px;
  border:1px solid var(--line);
  border-radius:6px;
  justify-content:center;
  align-items:center;
  color:var(--blue2);
  font-weight:900;
}
.faq__a{
  padding:14px 12px 18px;
  border-bottom:1px solid var(--line);
}
.faq__a p{ margin:0; }

.backtop{
  display:inline-block;
  margin-top:14px;
  color:var(--blue2);
  text-decoration:none;
  font-size:13px;
}
.backtop:hover{ text-decoration:underline; }

.footer{
  background:#23272b;
  color:#b8c0c8;
  padding:22px 16px;
  margin-top:26px;
}
.footer__inner{
  max-width:980px;
  margin:0 auto;
  text-align:center;
}
.footer__sub{
  margin-top:6px;
  font-size:12px;
  opacity:.9;
}

@media (max-width: 860px){
  .twoCol{ grid-template-columns:1fr; }
  .toc__grid{ grid-template-columns:1fr; }
  .card{ padding:26px 18px; }
}