:root{
  --blue:#2C7DF0;
  --blue-d:#1A5CC4;
  --blue-l:#E8F1FE;
  --blue-x:#F4F8FF;
  --red:#E8493F;
  --ink:#16233A;
  --sub:#4C6484;
  --line:#DCE8FB;
}
*{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth}
body{
  font-family:"PingFang SC","Microsoft YaHei","Helvetica Neue",Arial,sans-serif;
  color:var(--ink);background:#fff;line-height:1.75;font-size:16px;
  -webkit-font-smoothing:antialiased;
}
img{display:block;max-width:100%;height:auto}
a{color:inherit;text-decoration:none}
h1,h2,h3,h4{line-height:1.3;font-weight:700}
.wrap{width:100%;max-width:1180px;margin:0 auto;padding:0 26px}

/* ---------- header ---------- */
.hd{
  position:sticky;top:0;z-index:80;background:#fff;
  border-bottom:1px solid var(--line);
  transition:box-shadow .2s ease;
}
.hd.on{box-shadow:0 6px 22px rgba(30,70,140,.08)}
.hd-in{display:flex;align-items:center;gap:24px;height:70px}
.hd-brand{display:flex;align-items:center;gap:11px;flex:none}
.hd-brand img{width:40px;height:40px;border-radius:10px}
.hd-brand b{font-size:18px;display:block;line-height:1.2}
.hd-brand small{font-size:10px;letter-spacing:2px;color:var(--blue);display:block}
.hd-nav{display:flex;gap:26px;margin-left:12px;flex:1;font-size:14px;color:var(--sub)}
.hd-nav a{position:relative;padding:4px 0}
.hd-nav a::after{
  content:"";position:absolute;left:0;bottom:0;width:0;height:2px;
  background:var(--blue);transition:width .2s ease;
}
.hd-nav a:hover{color:var(--blue-d)}
.hd-nav a:hover::after{width:100%}
.hd-cta{
  background:var(--blue);color:#fff;border-radius:8px;padding:10px 22px;
  font-size:14px;font-weight:600;flex:none;
}
.hd-cta:hover{background:var(--blue-d)}
.hd-menu{display:none;background:none;border:0;color:var(--ink);cursor:pointer;padding:6px}

/* ---------- hero bento ---------- */
.hero{padding:36px 0 54px;background:linear-gradient(180deg,var(--blue-x) 0%,#fff 78%)}
.bento{display:grid;grid-template-columns:repeat(12,1fr);grid-auto-rows:minmax(70px,auto);gap:16px}
.bk{background:#fff;border:1px solid var(--line);border-radius:16px;padding:22px}
.bk-hero{grid-column:span 7;grid-row:span 2;padding:34px 32px;display:flex;flex-direction:column;justify-content:center}
.bk-hero .pill{
  display:inline-flex;width:max-content;align-items:center;gap:7px;
  background:var(--blue-l);color:var(--blue-d);border-radius:999px;
  font-size:11px;letter-spacing:1.6px;padding:5px 13px;margin-bottom:16px;
}
.bk-hero .pill::before{content:"";width:6px;height:6px;border-radius:50%;background:var(--blue)}
.bk-hero h1{font-size:50px;margin-bottom:12px;letter-spacing:1px}
.bk-hero h1 span{color:var(--blue)}
.bk-hero .lead{font-size:18px;color:var(--blue-d);font-weight:600;margin-bottom:14px}
.bk-hero .desc{font-size:15px;color:#41597A;margin-bottom:24px}
.bk-acts{display:flex;gap:11px;flex-wrap:wrap;align-items:center}
.btn{
  display:inline-flex;align-items:center;gap:8px;background:var(--blue);color:#fff;
  padding:13px 26px;border-radius:9px;font-weight:600;font-size:15px;
  box-shadow:0 10px 22px rgba(44,125,240,.22);transition:background .18s ease,transform .18s ease;
}
.btn svg{width:17px;height:17px}
.btn:hover{background:var(--blue-d);transform:translateY(-1px)}
.gbtn{
  display:inline-flex;align-items:center;padding:12px 22px;border-radius:9px;
  border:1px solid var(--blue);color:var(--blue-d);font-size:14px;font-weight:600;
}
.gbtn:hover{background:var(--blue-l)}
.bk-shot{
  grid-column:span 5;grid-row:span 2;padding:0;overflow:hidden;position:relative;
  border:0;background:var(--blue-l);
}
.bk-shot img{width:100%;height:100%;object-fit:cover;min-height:260px}
.bk-shot .cap{
  position:absolute;left:14px;bottom:14px;right:14px;
  background:rgba(255,255,255,.94);border-radius:9px;padding:10px 14px;
  font-size:12px;color:var(--sub);
}
.bk-stat{grid-column:span 2;text-align:center;display:flex;flex-direction:column;justify-content:center;gap:2px}
.bk-stat b{font-size:26px;color:var(--blue);font-family:"SFMono-Regular",Consolas,monospace}
.bk-stat span{font-size:12px;color:var(--sub)}
.bk-tip{grid-column:span 3;display:flex;align-items:center;gap:12px;background:var(--blue);border:0;color:#fff}
.bk-tip i{
  width:34px;height:34px;border-radius:50%;background:rgba(255,255,255,.2);
  display:grid;place-items:center;font-style:normal;font-size:13px;flex:none;
}
.bk-tip p{font-size:12.5px;line-height:1.6;color:#EAF2FF}
.bk-tip b{display:block;font-size:13px;color:#fff}

/* ---------- 区块 ---------- */
.sec{padding:64px 0}
.sec-alt{background:var(--blue-x)}
.sec-h{margin-bottom:32px}
.sec-h .tag{
  display:inline-block;font-size:10px;letter-spacing:2.5px;color:var(--blue);
  background:var(--blue-l);border-radius:5px;padding:3px 9px;margin-bottom:10px;
}
.sec-h h2{font-size:30px;margin-bottom:9px}
.sec-h p{font-size:15px;color:#41597A;max-width:840px}

/* ---------- 入口 4 列 ---------- */
.entry4{display:grid;grid-template-columns:repeat(4,1fr);gap:0}
.ecard{padding:22px 22px 26px;border-top:3px solid var(--line);position:relative;transition:background .2s ease}
.ecard:hover{background:var(--blue-l);border-top-color:var(--blue)}
.ecard .num{font-family:"SFMono-Regular",Consolas,monospace;font-size:11px;color:var(--blue);letter-spacing:1px}
.ecard h4{font-size:17px;margin:10px 0 8px}
.ecard p{font-size:14px;color:#41597A}
.ecard code{background:var(--blue-l);color:var(--blue-d);border-radius:4px;padding:1px 6px;font-size:13px}
.entry-note{
  margin-top:20px;border-left:3px solid var(--blue);padding:4px 0 4px 16px;
  font-size:14px;color:#41597A;
}

/* ---------- 特色 3 列紧凑 ---------- */
.feat3{display:grid;grid-template-columns:repeat(3,1fr);gap:16px}
.fcell{
  background:#fff;border:1px solid var(--line);border-radius:13px;padding:20px 20px 16px;
  display:flex;gap:14px;align-items:flex-start;transition:box-shadow .2s ease,transform .2s ease;
}
.fcell:hover{box-shadow:0 12px 26px rgba(30,70,140,.09);transform:translateY(-2px)}
.fcell .fi{
  width:40px;height:40px;border-radius:11px;background:var(--blue-l);
  display:grid;place-items:center;flex:none;
}
.fcell .fi svg{width:19px;height:19px;stroke:var(--blue);fill:none;stroke-width:2}
.fcell h4{font-size:16px;margin-bottom:5px}
.fcell p{font-size:13.5px;color:#41597A}
.fcell .ftag{
  display:inline-block;margin-top:9px;font-size:10.5px;letter-spacing:1px;
  color:var(--blue-d);background:var(--blue-l);border-radius:4px;padding:2px 8px;
}

/* ---------- 界面展示 ---------- */
.show2{display:grid;gap:16px}
.srow1{display:grid;grid-template-columns:1.35fr .65fr;gap:16px;align-items:stretch}
.sbig{border-radius:16px;overflow:hidden;border:1px solid var(--line);background:#fff}
.sbig img{width:100%;height:100%;object-fit:cover}
.snote{
  background:var(--blue);color:#fff;border-radius:16px;padding:26px 24px;
  display:flex;flex-direction:column;justify-content:center;gap:10px;
}
.snote h4{font-size:19px}
.snote p{font-size:13.5px;color:#E4EEFF}
.snote .sk{font-size:10px;letter-spacing:2px;color:#B9D4FF}
.srow2{display:grid;grid-template-columns:repeat(3,1fr);gap:16px}
.small{border:1px solid var(--line);border-radius:12px;overflow:hidden;background:#fff}
.small img{width:100%}
.small figcaption{font-size:12px;color:var(--sub);padding:9px 13px;border-top:1px solid var(--line);display:flex;gap:8px;align-items:center}
.small figcaption b{color:var(--blue);font-family:"SFMono-Regular",Consolas,monospace;font-size:10.5px}

/* ---------- 横向时间轴 ---------- */
.tl{margin-top:26px;display:grid;grid-template-columns:repeat(4,1fr);gap:0;position:relative}
.tl::before{
  content:"";position:absolute;left:6%;right:6%;top:15px;height:2px;
  background:linear-gradient(90deg,var(--blue-l),var(--blue),var(--blue-l));
}
.tl-i{position:relative;padding:0 14px;text-align:center}
.tl-i .dot{
  width:32px;height:32px;border-radius:50%;background:#fff;border:2px solid var(--blue);
  color:var(--blue);display:grid;place-items:center;margin:0 auto 12px;
  font-family:"SFMono-Regular",Consolas,monospace;font-size:12px;font-weight:700;position:relative;z-index:1;
}
.tl-i h4{font-size:14.5px;margin-bottom:5px}
.tl-i p{font-size:12.5px;color:#41597A}

/* ---------- FAQ 卡片 ---------- */
.faqcards{display:grid;grid-template-columns:repeat(2,1fr);gap:14px}
.fc{
  background:#fff;border:1px solid var(--line);border-radius:13px;padding:20px 22px;
  position:relative;padding-left:56px;
}
.fc .fq{
  position:absolute;left:18px;top:18px;width:26px;height:26px;border-radius:8px;
  background:var(--blue-l);color:var(--blue-d);display:grid;place-items:center;
  font-family:"SFMono-Regular",Consolas,monospace;font-size:11px;font-weight:700;
}
.fc h3{font-size:16px;margin-bottom:6px}
.fc p{font-size:13.5px;color:#41597A}
.fc:last-child{grid-column:1/-1}

/* ---------- 评价列表 ---------- */
.revlist{display:grid;gap:12px}
.rv{
  background:#fff;border:1px solid var(--line);border-radius:12px;
  display:grid;grid-template-columns:1fr 176px;
}
.rv blockquote{padding:20px 24px;font-size:14.5px;color:#3B5578;border-left:4px solid var(--blue)}
.rv .who{
  border-left:1px solid var(--line);padding:18px;display:flex;flex-direction:column;
  justify-content:center;gap:3px;background:var(--blue-x);
}
.rv .who b{font-size:14px;display:flex;align-items:center;gap:8px}
.rv .who b i{
  width:24px;height:24px;border-radius:50%;background:var(--blue);color:#fff;
  display:grid;place-items:center;font-style:normal;font-size:11px;font-weight:700;
}
.rv .who time{font-size:11px;color:var(--sub);font-family:"SFMono-Regular",Consolas,monospace}

/* ---------- 下载卡 ---------- */
.dlbox{
  background:var(--blue-l);border-radius:22px;padding:38px;
  display:grid;grid-template-columns:82px 1fr auto;gap:28px;align-items:center;
}
.dlbox img{width:82px;height:82px;border-radius:18px;box-shadow:0 10px 22px rgba(44,125,240,.22)}
.dlbox h2{font-size:29px;margin-bottom:8px}
.dlbox h2 em{font-style:normal;color:var(--blue)}
.dlbox p{font-size:14px;color:#3B5578;max-width:720px}
.dlbox .dlm{display:flex;gap:8px;flex-wrap:wrap;margin-top:12px}
.dlbox .dlm span{
  font-size:11px;background:#fff;border:1px solid #CFE0FA;color:var(--blue-d);
  border-radius:999px;padding:3px 11px;
}
.dlbtn{
  display:inline-flex;align-items:center;gap:8px;background:var(--blue);color:#fff;
  padding:15px 30px;border-radius:10px;font-weight:700;font-size:15px;flex:none;
  box-shadow:0 12px 24px rgba(44,125,240,.26);
}
.dlbtn svg{width:17px;height:17px;stroke:#fff;fill:none;stroke-width:2}
.dlbtn:hover{background:var(--blue-d)}

/* ---------- footer ---------- */
.ft{background:#EEF4FE;border-top:1px solid var(--line);padding:38px 0 28px;margin-top:64px;font-size:13px;color:#4C6484}
.ft-top{display:flex;align-items:center;gap:10px;margin-bottom:11px;color:var(--ink)}
.ft-top img{width:30px;height:30px;border-radius:8px}
.ft-top strong{font-size:15px}
.ft p{max-width:760px;line-height:1.9}
.ft-links{display:flex;gap:20px;flex-wrap:wrap;margin:15px 0;font-size:12px}
.ft-links a:hover{color:var(--blue-d)}
.ft-copy{border-top:1px solid #D8E6FA;padding-top:15px;font-size:11px;color:#6A82A3;line-height:1.9}

/* ---------- 返回顶部 ---------- */
.backtop{
  position:fixed;right:24px;bottom:88px;z-index:60;width:44px;height:44px;
  border-radius:50%;border:0;background:var(--blue);color:#fff;cursor:pointer;
  display:grid;place-items:center;opacity:0;pointer-events:none;
  transition:opacity .2s ease,transform .2s ease;transform:translateY(10px);
}
.backtop.on{opacity:1;pointer-events:auto;transform:translateY(0)}

/* ---------- 响应式 ---------- */
@media (max-width:980px){
  .hd-menu{display:block}
  .hd-nav{
    position:absolute;left:0;right:0;top:70px;background:#fff;
    flex-direction:column;gap:0;padding:0 26px;border-bottom:1px solid var(--line);
    display:none;
  }
  .hd-nav.open{display:flex}
  .hd-nav a{padding:13px 0;border-bottom:1px solid var(--line);font-size:15px}
  .hd-cta{margin-left:auto}
  .bk-hero{grid-column:span 12;grid-row:auto;padding:28px 24px}
  .bk-hero h1{font-size:38px}
  .bk-shot{grid-column:span 12;grid-row:auto;min-height:0}
  .bk-shot img{min-height:220px}
  .bk-stat{grid-column:span 4}
  .bk-tip{grid-column:span 12}
  .entry4{grid-template-columns:repeat(2,1fr)}
  .feat3{grid-template-columns:repeat(2,1fr)}
  .srow1{grid-template-columns:1fr}
  .srow2{grid-template-columns:1fr}
  .tl{grid-template-columns:repeat(2,1fr);gap:22px 0}
  .tl::before{display:none}
  .faqcards{grid-template-columns:1fr}
  .rv{grid-template-columns:1fr}
  .rv .who{border-left:0;border-top:1px solid var(--line);flex-direction:row;align-items:center;gap:10px}
  .dlbox{grid-template-columns:1fr;gap:18px;padding:28px}
}
@media (max-width:760px){
  .wrap{padding:0 18px}
  .hd-in{height:60px;gap:12px}
  .hd-nav{top:60px;padding:0 18px}
  .hd-brand b{font-size:16px}
  .hd-cta{padding:9px 15px;font-size:13px}
  .hero{padding:24px 0 40px}
  .bk-hero h1{font-size:32px}
  .bk-hero .lead{font-size:16px}
  .entry4{grid-template-columns:1fr}
  .ecard{border-top-width:2px}
  .feat3{grid-template-columns:1fr}
  .sec{padding:44px 0}
  .sec-h h2{font-size:24px}
  .bk-stat{grid-column:span 6}
  .dlbox h2{font-size:24px}
  .dlbtn{width:100%;justify-content:center}
  .backtop{right:16px;bottom:76px;width:40px;height:40px}
}