/* ============ 基础 ============ */
:root{
  --ink:#101828; --ink2:#2B3448; --sub:#5E6880; --mut:#8891A6;
  --line:#E6E8F0; --line2:#EEF0F6;
  --bg:#FFFFFF; --soft:#F6F7FB; --soft2:#FBFCFE;
  --brand:#5B5BD6; --brand2:#7C3AED; --brand-soft:#EEEEFB;
  --wx:#07C160; --ali:#1677FF; --warm:#F59E0B;
  --dark:#12131F; --dark2:#1B1D2E;
  --r:16px; --r-s:10px;
  --sh:0 1px 2px rgba(16,24,40,.04), 0 8px 24px -12px rgba(16,24,40,.10);
  --sh-h:0 2px 4px rgba(16,24,40,.05), 0 22px 48px -18px rgba(16,24,40,.18);
  --ff:-apple-system,BlinkMacSystemFont,"PingFang SC","Hiragino Sans GB","Microsoft YaHei",system-ui,sans-serif;
  --nav-h:68px;
}
*{box-sizing:border-box}
html{scroll-behavior:smooth; scroll-padding-top:84px; -webkit-text-size-adjust:100%}
body{
  margin:0; font-family:var(--ff); background:var(--bg); color:var(--ink);
  font-size:16px; line-height:1.7; -webkit-font-smoothing:antialiased;
  overflow-x:hidden;
}
h1,h2,h3,h4{margin:0; line-height:1.25; letter-spacing:-.02em; font-weight:700}
p{margin:0}
ul,ol,dl{margin:0; padding:0; list-style:none}
a{color:inherit; text-decoration:none}
button,input,select,textarea{font-family:inherit; font-size:inherit; color:inherit}
img,svg{display:block; max-width:100%}
em{font-style:normal}
::selection{background:var(--brand); color:#fff}

.wrap{width:100%; max-width:1180px; margin:0 auto; padding:0 24px}
.wrap-n{max-width:860px}
.sec{padding:96px 0; position:relative}
.sec-soft{background:var(--soft); border-top:1px solid var(--line2); border-bottom:1px solid var(--line2)}
.sec-dark{background:var(--dark); color:#fff}
.sec-dark h2,.sec-dark h3,.sec-dark h4{color:#fff}

.kicker{
  display:inline-block; font-size:13px; font-weight:700; letter-spacing:.08em;
  color:var(--brand); background:var(--brand-soft); padding:6px 12px; border-radius:99px; margin-bottom:18px;
}
.sec-dark .kicker{color:#B9AEFF; background:rgba(124,58,237,.16)}

.sec-head{max-width:760px; margin-bottom:52px}
.sec-head h2{font-size:clamp(26px,3.4vw,40px); margin-bottom:16px}
.sec-head p{color:var(--sub); font-size:17px}
.sec-dark .sec-head p{color:#A7ADC4}

/* ============ 按钮 ============ */
.btn{
  display:inline-flex; align-items:center; justify-content:center; gap:8px;
  height:50px; padding:0 24px; border-radius:99px; font-weight:600; font-size:15px;
  border:1px solid transparent; cursor:pointer; transition:.22s cubic-bezier(.2,.7,.4,1);
  white-space:nowrap;
}
.btn svg{transition:transform .22s}
.btn:hover svg{transform:translateX(3px)}
.btn-main{background:linear-gradient(120deg,var(--brand),var(--brand2)); color:#fff; box-shadow:0 8px 22px -10px rgba(91,91,214,.7)}
.btn-main:hover{transform:translateY(-2px); box-shadow:0 14px 30px -12px rgba(91,91,214,.85)}
.btn-line{background:#fff; border-color:var(--line); color:var(--ink)}
.btn-line:hover{border-color:var(--brand); color:var(--brand); transform:translateY(-2px)}
.btn-ghost{height:40px; padding:0 18px; font-size:14px; background:var(--brand-soft); color:var(--brand)}
.btn-ghost:hover{background:var(--brand); color:#fff}
.btn-full{width:100%}
.btn-sm{height:40px; padding:0 18px; font-size:14px}

/* ============ 导航 ============ */
.nav{
  position:fixed; top:0; left:0; right:0; z-index:60; height:var(--nav-h);
  background:rgba(255,255,255,.72); backdrop-filter:saturate(180%) blur(14px);
  border-bottom:1px solid transparent; transition:.25s;
}
.nav.solid{background:rgba(255,255,255,.94); border-bottom-color:var(--line2); box-shadow:0 6px 20px -16px rgba(16,24,40,.4)}
.nav-in{height:var(--nav-h); display:flex; align-items:center; gap:24px}
.logo{display:flex; align-items:center; gap:10px; flex:none}
.logo-mark{display:flex; flex:none}
.logo-mark img{width:32px; height:32px; display:block}
.logo-txt{font-weight:800; font-size:18px; letter-spacing:-.02em; line-height:1.1; white-space:nowrap}
.logo-txt em{display:block; margin-top:3px; font-size:10.5px; font-weight:500; letter-spacing:.02em; color:var(--mut)}
/* align-items:center 必须显式写：默认 stretch 会把带下拉的 .has-sub 撑高，
   里面 inline 的 <a> 只能贴在顶部，导致该项文字比其它项高 7px */
.menu{display:flex; align-items:center; gap:4px; margin-left:auto; flex:none}
.menu a{
  padding:8px 14px; font-size:15px; font-weight:500; color:var(--ink2);
  border-radius:8px; transition:.18s; white-space:nowrap; flex:none;
}
.menu a:hover,.menu a.on{color:var(--brand); background:var(--brand-soft)}
.menu a.on{font-weight:650}
.nav-act{display:flex; align-items:center; gap:10px; margin-left:8px}
.burger{display:none; width:42px; height:42px; border:1px solid var(--line); background:#fff; border-radius:12px; cursor:pointer; padding:0}
.burger span{display:block; width:18px; height:2px; background:var(--ink); margin:4px auto; border-radius:2px; transition:.25s}
.burger.on span:nth-child(1){transform:translateY(6px) rotate(45deg)}
.burger.on span:nth-child(2){opacity:0}
.burger.on span:nth-child(3){transform:translateY(-6px) rotate(-45deg)}

/* ============ HERO ============ */
.hero{position:relative; padding:132px 0 40px; overflow:hidden}
.hero-bg{position:absolute; inset:0; pointer-events:none; z-index:0}
.orb{position:absolute; border-radius:50%; filter:blur(70px); opacity:.5; animation:float 14s ease-in-out infinite}
.orb-a{width:420px; height:420px; background:radial-gradient(circle,#8B8BF0,#5B5BD6); top:-120px; left:-80px}
.orb-b{width:380px; height:380px; background:radial-gradient(circle,#A78BFA,#7C3AED); top:60px; right:-100px; animation-delay:-5s}
.orb-c{width:320px; height:320px; background:radial-gradient(circle,#6EE7B7,#07C160); bottom:-160px; left:38%; opacity:.28; animation-delay:-9s}
@keyframes float{
  0%,100%{transform:translate(0,0) scale(1)}
  33%{transform:translate(38px,-26px) scale(1.06)}
  66%{transform:translate(-28px,22px) scale(.96)}
}
.grid-lines{
  position:absolute; inset:0; opacity:.35;
  background-image:linear-gradient(to right,rgba(16,24,40,.045) 1px,transparent 1px);
  background-size:96px 100%;
  mask-image:linear-gradient(to bottom,#000,transparent 78%);
  -webkit-mask-image:linear-gradient(to bottom,#000,transparent 78%);
}
.hero-in{position:relative; z-index:1; display:grid; grid-template-columns:1.05fr .95fr; gap:56px; align-items:start}

.tagpill{
  display:inline-flex; align-items:center; gap:8px; font-size:13px; font-weight:600; color:var(--ink2);
  background:#fff; border:1px solid var(--line); padding:7px 14px; border-radius:99px; box-shadow:var(--sh);
}
.tagpill .dot{width:7px;height:7px;border-radius:50%;background:var(--wx); box-shadow:0 0 0 4px rgba(7,193,96,.16)}
.tagpill .sep{margin:0 2px; color:#CFD5E4}

.hero h1{
  font-size:clamp(30px,3.5vw,44px); line-height:1.2; margin:22px 0 20px; letter-spacing:-.03em;
}
.hero h1 em{
  background:linear-gradient(120deg,var(--brand),var(--brand2)); -webkit-background-clip:text; background-clip:text; color:transparent;
  position:relative;
}
.lede{font-size:17px; color:var(--sub); max-width:600px}
.hero-cta{display:flex; gap:12px; margin:30px 0 34px; flex-wrap:wrap}
.hero-facts{display:flex; gap:14px; flex-wrap:wrap; padding-top:26px; border-top:1px solid var(--line2)}
.hero-facts li{display:flex; flex-direction:column; min-width:110px}
.hero-facts b{font-size:28px; font-weight:800; letter-spacing:-.03em; font-variant-numeric:tabular-nums}
.hero-facts span{font-size:13px; color:var(--mut)}

.hero-card{
  background:#fff; border:1px solid var(--line); border-radius:20px; padding:22px;
  box-shadow:var(--sh-h); position:relative;
}
.hero-card::before{
  content:""; position:absolute; inset:-1px; border-radius:20px; padding:1px; pointer-events:none;
  background:linear-gradient(140deg,rgba(91,91,214,.4),rgba(124,58,237,.12),transparent 60%);
  -webkit-mask:linear-gradient(#000 0 0) content-box,linear-gradient(#000 0 0);
  mask:linear-gradient(#000 0 0) content-box,linear-gradient(#000 0 0);
  -webkit-mask-composite:xor; mask-composite:exclude;
}
.hc-head{margin-bottom:14px}
.hc-title{display:block; font-weight:700; font-size:16px}
.hc-sub{display:block; font-size:13px; color:var(--mut)}
.hc-list{display:flex; flex-direction:column; gap:2px}
.hc-list li{display:flex; gap:12px; padding:12px 0; border-bottom:1px dashed var(--line2)}
.hc-list li:last-child{border:0}
.hc-list strong{display:block; font-size:15px; font-weight:650}
.hc-list span{font-size:13px; color:var(--sub); line-height:1.55}
.ic{width:32px; height:32px; border-radius:9px; flex:none; position:relative}
.ic::after{content:""; position:absolute; inset:0; border-radius:9px; opacity:.14}
.ic-wx{background:rgba(7,193,96,.14)} .ic-wx::before{content:"微"; }
.ic-seo{background:rgba(91,91,214,.14)}
.ic-ad{background:rgba(245,158,11,.16)}
.ic-no{background:rgba(16,24,40,.08)}
.ic::before{
  position:absolute; inset:0; display:flex; align-items:center; justify-content:center;
  font-size:13px; font-weight:800; color:var(--ink2);
}
.ic-wx::before{content:"微"; color:#0A9E52}
.ic-seo::before{content:"搜"; color:var(--brand)}
.ic-ad::before{content:"投"; color:#C2740A}
.ic-no::before{content:"粉"; color:var(--ink2)}

.hc-btn{
  display:block; margin-top:16px; padding:12px 14px; border-radius:12px; text-align:center;
  font-size:14px; font-weight:600; background:var(--brand-soft); color:var(--brand); transition:.2s;
}
.hc-btn:hover{background:var(--brand); color:#fff}

/* marquee */
.marquee{
  position:relative; margin-top:56px; overflow:hidden; padding:14px 0;
  border-top:1px solid var(--line2); border-bottom:1px solid var(--line2);
  mask-image:linear-gradient(to right,transparent,#000 8%,#000 92%,transparent);
  -webkit-mask-image:linear-gradient(to right,transparent,#000 8%,#000 92%,transparent);
}
.mq-track{display:flex; gap:26px; width:max-content; animation:mq 34s linear infinite; white-space:nowrap}
.mq-track span{font-size:14px; font-weight:600; color:var(--ink2)}
.mq-track i{color:var(--brand); font-size:9px; opacity:.7; align-self:center}
@keyframes mq{to{transform:translateX(-50%)}}
@media (prefers-reduced-motion:reduce){.mq-track,.orb{animation:none}}

/* ============ 平台卡 ============ */
.plat-grid{display:grid; grid-template-columns:1fr 1fr; gap:24px; align-items:start}
.plat{
  background:#fff; border:1px solid var(--line); border-radius:var(--r); overflow:hidden;
  box-shadow:var(--sh); transition:.28s cubic-bezier(.2,.7,.4,1);
}
.plat:hover{transform:translateY(-4px); box-shadow:var(--sh-h)}
.plat header{padding:28px 28px 22px; border-bottom:1px solid var(--line2)}
.plat-badge{
  display:inline-block; font-size:12px; font-weight:700; letter-spacing:.05em;
  padding:5px 11px; border-radius:6px; margin-bottom:12px;
}
.plat-wx .plat-badge{background:rgba(7,193,96,.12); color:#089B4E}
.plat-ali .plat-badge{background:rgba(22,119,255,.12); color:#1668DC}
.plat h3{font-size:21px; margin-bottom:10px}
.plat-desc{font-size:14.5px; color:var(--sub)}
.plat-body{padding:6px 28px 22px}
.pblock{padding:18px 0; border-bottom:1px dashed var(--line2)}
.pblock:last-child{border:0; padding-bottom:6px}
.pblock h4{font-size:13px; color:var(--mut); font-weight:700; letter-spacing:.04em; margin-bottom:12px}
.chips{display:flex; flex-wrap:wrap; gap:7px}
.chips span{
  font-size:13px; padding:5px 11px; border-radius:8px; background:var(--soft); color:var(--ink2); border:1px solid var(--line2);
}
.plat-wx .chips-o span{background:rgba(7,193,96,.09); border-color:rgba(7,193,96,.2); color:#0A7A42}
.plat-ali .chips-o span{background:rgba(22,119,255,.09); border-color:rgba(22,119,255,.2); color:#1457B8}
.plat-foot{
  display:flex; align-items:center; justify-content:space-between; padding:16px 28px;
  background:var(--soft); border-top:1px solid var(--line2); font-size:13px; color:var(--mut);
}
.plat-foot b{font-size:14px; color:var(--ink)}

.tick li{position:relative; padding-left:22px; font-size:14.5px; color:var(--ink2); margin-bottom:9px}
.tick li:last-child{margin-bottom:0}
.tick li::before{
  content:""; position:absolute; left:0; top:8px; width:11px; height:7px;
  border-left:2px solid var(--brand); border-bottom:2px solid var(--brand);
  transform:rotate(-45deg); border-radius:1px;
}

/* ============ SEO ============ */
.seo-wrap{display:grid; grid-template-columns:1.15fr .85fr; gap:32px; align-items:start}
.seo-steps{display:flex; flex-direction:column}
.ss{
  display:flex; gap:20px; padding:26px 0; border-top:1px solid var(--line);
}
.ss:first-child{border-top:0; padding-top:0}
.ss-n{
  font-size:15px; font-weight:800; color:var(--brand); flex:none; width:44px; height:44px;
  display:flex; align-items:center; justify-content:center; border-radius:12px; background:var(--brand-soft);
  letter-spacing:-.02em;
}
.ss h3{font-size:18px; margin-bottom:8px}
.ss p{font-size:15px; color:var(--sub)}
.seo-side{background:#fff; border:1px solid var(--line); border-radius:var(--r); padding:26px; box-shadow:var(--sh); position:sticky; top:96px}
.seo-side h4{font-size:15px; margin-bottom:16px}
.deliv li{display:flex; flex-direction:column; padding:12px 0; border-bottom:1px dashed var(--line2)}
.deliv li:last-child{border:0}
.deliv span{font-size:14.5px; font-weight:600}
.deliv b{font-size:13px; color:var(--mut); font-weight:500}
.seo-note{
  margin-top:18px; padding:14px 16px; background:var(--soft); border-radius:var(--r-s);
  font-size:13px; color:var(--sub); line-height:1.65;
}
.seo-note b{display:block; color:var(--ink); margin-bottom:4px; font-size:13px}

/* ============ 广告 ============ */
.ads-grid{display:grid; grid-template-columns:1fr 1fr; gap:24px}
.ad-card{background:#fff; border:1px solid var(--line); border-radius:var(--r); padding:28px; box-shadow:var(--sh)}
.ad-top{display:flex; align-items:center; gap:12px; margin-bottom:12px}
.plat-dot{width:12px; height:12px; border-radius:50%; flex:none}
.plat-dot.wx{background:var(--wx); box-shadow:0 0 0 4px rgba(7,193,96,.14)}
.plat-dot.ali{background:var(--ali); box-shadow:0 0 0 4px rgba(22,119,255,.14)}
.ad-top h3{font-size:20px}
.ad-lead{font-size:14.5px; color:var(--sub); margin-bottom:18px; padding-bottom:18px; border-bottom:1px solid var(--line2)}
.ad-dl div{display:grid; grid-template-columns:88px 1fr; gap:16px; padding:11px 0; border-bottom:1px dashed var(--line2)}
.ad-dl div:last-child{border:0}
.ad-dl dt{font-size:13px; color:var(--mut); font-weight:600}
.ad-dl dd{margin:0; font-size:14.5px; color:var(--ink2)}

.ad-flow{margin-top:40px; background:var(--soft); border:1px solid var(--line2); border-radius:var(--r); padding:28px}
.ad-flow h4{font-size:16px; margin-bottom:18px}
.af-row{display:flex; flex-wrap:wrap; align-items:center; gap:10px}
.af-row span{
  font-size:14px; font-weight:600; padding:9px 14px; background:#fff; border:1px solid var(--line);
  border-radius:99px;
}
.af-row i{color:var(--brand); font-style:normal; font-size:14px}
.af-note{margin-top:18px; font-size:14px; color:var(--sub); border-left:3px solid var(--brand); padding-left:14px}

/* ============ 测算器 ============ */
.calc{display:grid; grid-template-columns:1fr 1fr; gap:0; background:rgba(255,255,255,.04); border:1px solid rgba(255,255,255,.1); border-radius:20px; overflow:hidden}
.calc-form{padding:32px}
.calc-out{padding:32px; background:linear-gradient(160deg,rgba(91,91,214,.22),rgba(124,58,237,.10)); border-left:1px solid rgba(255,255,255,.1)}
.fld{margin-bottom:22px}
.fld:last-child{margin-bottom:0}
.sec-dark .fld label,.sec-dark .fld label em{color:inherit}
.fld label{display:block; font-size:13.5px; font-weight:600; margin-bottom:10px; color:var(--sub)}
.sec-dark .fld label{color:#C3C8DB}
.fld label em{color:#E4685D; font-style:normal}
.inp{display:flex; align-items:center; gap:8px; background:rgba(255,255,255,.06); border:1px solid rgba(255,255,255,.14); border-radius:12px; padding:0 14px; height:50px}
.inp input{flex:1; min-width:0; background:none; border:0; outline:none; color:#fff; font-size:18px; font-weight:700; font-variant-numeric:tabular-nums}
.inp input::-webkit-outer-spin-button,.inp input::-webkit-inner-spin-button{opacity:.55}
/* 聚焦态：让"这个框能改"这件事可见 */
.inp:focus-within{border-color:var(--brand); background:rgba(255,255,255,.1); box-shadow:0 0 0 3px rgba(91,91,214,.22)}
/* 浅色区块里的输入框才用白底。
   必须排除 .sec-dark —— 深色 section 同样带 .sec 类，若命中会被刷成白底，
   而输入文字是白色（深色区块设计），结果白底白字，用户看到的是"空框、好像不能编辑" */
.sec-soft .inp,.sec:not(.sec-dark) .inp{background:#fff; border-color:var(--line)}
.unit{font-size:13px; color:#98A0B8; flex:none}
.sec:not(.sec-dark) .unit,.sec-soft .unit{color:var(--mut)}
input[type=range]{
  -webkit-appearance:none; appearance:none; width:100%; height:24px; background:none; margin-top:10px; cursor:pointer;
}
input[type=range]::-webkit-slider-runnable-track{height:4px; background:rgba(255,255,255,.18); border-radius:99px}
input[type=range]::-webkit-slider-thumb{
  -webkit-appearance:none; width:18px; height:18px; border-radius:50%; background:#fff; margin-top:-7px;
  box-shadow:0 2px 8px rgba(0,0,0,.35); border:4px solid var(--brand); box-sizing:border-box;
}
input[type=range]::-moz-range-track{height:4px; background:rgba(255,255,255,.18); border-radius:99px}
input[type=range]::-moz-range-thumb{width:16px;height:16px;border-radius:50%;background:#fff;border:4px solid var(--brand)}
.fld-row{display:grid; grid-template-columns:1fr 1fr; gap:16px}
.seg{display:flex; flex-wrap:wrap; gap:8px}
.seg button{
  padding:9px 14px; border-radius:99px; border:1px solid rgba(255,255,255,.16); background:rgba(255,255,255,.05);
  color:#C3C8DB; font-size:13.5px; cursor:pointer; transition:.2s;
}
.seg button:hover{border-color:rgba(255,255,255,.4); color:#fff}
.seg button.on{background:#fff; color:var(--brand); border-color:#fff; font-weight:700}

.co-main{margin-bottom:22px}
.co-main span{display:block; font-size:13.5px; color:#C3C8DB}
.co-main b{
  display:block; font-size:clamp(38px,5vw,54px); font-weight:800; letter-spacing:-.04em; line-height:1.1;
  font-variant-numeric:tabular-nums;
  background:linear-gradient(120deg,#fff,#C9BCFF); -webkit-background-clip:text; background-clip:text; color:transparent;
}
.co-main em{font-size:13.5px; color:#A7ADC4}
.co-grid{display:grid; grid-template-columns:1fr 1fr; gap:1px; background:rgba(255,255,255,.12); border-radius:12px; overflow:hidden; margin-bottom:18px}
.co-grid div{background:rgba(18,19,31,.5); padding:14px 16px}
.co-grid span{display:block; font-size:12.5px; color:#A7ADC4}
.co-grid b{font-size:20px; font-weight:800; font-variant-numeric:tabular-nums}
.co-bar{display:flex; height:36px; border-radius:99px; overflow:hidden; background:rgba(255,255,255,.1); margin-bottom:16px}
.co-bar div{display:flex; align-items:center; justify-content:center; font-size:12.5px; font-weight:700; color:#fff; transition:width .35s ease; min-width:0; overflow:hidden}
.cb-wx{background:linear-gradient(120deg,#0A9E52,#07C160)}
.cb-ali{background:linear-gradient(120deg,#1668DC,#1677FF)}
.co-note{font-size:13px; color:#A7ADC4; line-height:1.65; margin-bottom:18px; min-height:52px}

/* ============ 流程 ============ */
.flow{display:grid; grid-template-columns:repeat(5,1fr); gap:0; border-top:2px solid var(--ink)}
.flow li{
  padding:26px 22px 26px 0; border-right:1px solid var(--line2); position:relative;
}
.flow li:last-child{border-right:0}
.flow li::before{
  content:""; position:absolute; top:-7px; left:0; width:12px; height:12px; border-radius:50%;
  background:var(--brand); box-shadow:0 0 0 4px var(--brand-soft);
}
.fl-d{
  display:inline-block; font-size:12px; font-weight:800; letter-spacing:.05em; color:var(--brand);
  background:var(--brand-soft); padding:4px 9px; border-radius:6px; margin-bottom:12px;
}
.flow h3{font-size:17px; margin-bottom:8px}
.flow p{font-size:14px; color:var(--sub)}
.fl-out{display:block; margin-top:14px; font-size:12.5px; color:var(--mut); font-weight:600}

/* ============ FAQ ============ */
.faq{border-top:1px solid var(--line)}
.qa{border-bottom:1px solid var(--line)}
.qa-q{
  width:100%; display:flex; align-items:center; justify-content:space-between; gap:20px;
  padding:22px 0; background:none; border:0; cursor:pointer; text-align:left;
  font-size:17px; font-weight:650; color:var(--ink);
}
.qa-q i{position:relative; width:20px; height:20px; flex:none}
.qa-q i::before,.qa-q i::after{
  content:""; position:absolute; background:var(--brand); border-radius:2px; transition:.25s;
  left:50%; top:50%;
}
.qa-q i::before{width:14px; height:2px; transform:translate(-50%,-50%)}
.qa-q i::after{width:2px; height:14px; transform:translate(-50%,-50%)}
.qa.on .qa-q i::after{transform:translate(-50%,-50%) rotate(90deg); opacity:0}
.qa-a{max-height:0; overflow:hidden; transition:max-height .32s ease}
.qa.on .qa-a{max-height:340px}
.qa-a p{padding:0 0 24px; font-size:15px; color:var(--sub); max-width:720px}

/* ============ 联系 ============ */
.contact{padding-bottom:96px}
.ct{display:grid; grid-template-columns:1fr 1fr; gap:56px; align-items:start}
.ct-l h2{font-size:clamp(26px,3vw,34px); margin-bottom:14px}
.ct-l p{color:#A7ADC4; font-size:16px}
.ct-list{margin-top:30px; display:flex; flex-direction:column; gap:16px}
.ct-list li{padding-left:16px; border-left:2px solid rgba(124,58,237,.6)}
.ct-list b{display:block; font-size:15px; color:#fff; font-weight:700}
.ct-list span{font-size:13.5px; color:#A7ADC4}
.ct-form{background:rgba(255,255,255,.04); border:1px solid rgba(255,255,255,.1); border-radius:20px; padding:30px}
.ct-form .fld label{color:#C3C8DB}
.ct-form input[type=text],.ct-form input[type=tel],.ct-form select,.ct-form textarea{
  width:100%; background:rgba(255,255,255,.06); border:1px solid rgba(255,255,255,.14); border-radius:12px;
  padding:13px 14px; color:#fff; outline:none; transition:.2s; font-size:15px;
}
.ct-form textarea{resize:vertical; min-height:88px; line-height:1.6}
.ct-form input::placeholder,.ct-form textarea::placeholder{color:#79809A}
.ct-form input:focus,.ct-form select:focus,.ct-form textarea:focus{border-color:var(--brand); background:rgba(255,255,255,.09)}
.ct-form select{appearance:none; background-image:url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' width='12' height='8'><path d='M1 1l5 5 5-5' fill='none' stroke='%23A7ADC4' stroke-width='1.6'/></svg>"); background-repeat:no-repeat; background-position:right 14px center}
.ct-form select option{color:#101828}
/* 联系方式：类型下拉 + 输入框 同行。窄屏下下拉收窄但不换行，避免两行错位 */
.ct-phone{display:flex; gap:10px}
.ct-phone select{flex:0 0 96px; width:96px; padding-right:30px; flex:none}
.ct-phone input{flex:1 1 auto; min-width:0}
.fld-hint{margin:8px 0 0; font-size:12.5px; color:#8C93AB; line-height:1.5}
@media (max-width:520px){
  .ct-phone{gap:8px}
  .ct-phone select{flex:0 0 84px; width:84px}
}
.tags{display:flex; flex-wrap:wrap; gap:8px}
.tags button{
  padding:9px 15px; border-radius:99px; border:1px solid rgba(255,255,255,.16); background:rgba(255,255,255,.05);
  color:#C3C8DB; font-size:13.5px; cursor:pointer; transition:.2s;
}
.tags button:hover{border-color:rgba(255,255,255,.4); color:#fff}
.tags button.on{background:#fff; color:var(--brand); border-color:#fff; font-weight:700}
.ct-tip{font-size:12.5px; color:#79809A; margin-top:14px; line-height:1.6}
.ct-tip.err{color:#FF8A80}
.ct-tip.ok{color:#6EE7B7}

/* ============ 页脚 ============ */
.foot{background:#0C0D16; color:#8A91A8; padding:52px 0 28px}
.foot-in{display:flex; justify-content:space-between; gap:32px; flex-wrap:wrap; padding-bottom:28px; border-bottom:1px solid rgba(255,255,255,.08)}
.foot-brand .logo-txt{color:#fff; margin-bottom:12px; display:inline-block}
.foot-brand .logo-txt em{color:#8B94B0}
.foot-brand p{font-size:13.5px; line-height:1.8}
.foot-links{display:flex; gap:44px; flex-wrap:wrap; align-items:flex-start}
.fg{display:flex; flex-direction:column; gap:9px}
.fg b{color:#fff; font-size:12.5px; letter-spacing:.06em; margin-bottom:3px}
.foot-links a{font-size:14px; color:#A7ADC4}
.foot-links a:hover{color:#fff}
.foot-b{display:flex; justify-content:space-between; gap:16px; flex-wrap:wrap; padding-top:22px; font-size:12.5px}
.fb-note{max-width:620px; color:#6B7390}

/* ============ 移动底部条 ============ */
.mbar{
  display:none; position:fixed; left:0; right:0; bottom:0; z-index:55;
  background:rgba(255,255,255,.96); backdrop-filter:blur(12px); border-top:1px solid var(--line);
  padding:10px 16px calc(10px + env(safe-area-inset-bottom)); align-items:center; gap:12px;
  transform:translateY(110%); transition:transform .3s;
}
.mbar.show{transform:translateY(0)}
.mb-txt{font-size:14px; font-weight:650; flex:1}
.mbar .btn{flex:none}

/* ============ 动画 ============ */
.js .reveal{opacity:0; transform:translateY(22px); transition:opacity .6s ease, transform .6s cubic-bezier(.2,.7,.4,1)}
.js .reveal.in{opacity:1; transform:none}

/* ============ 响应式 ============ */
@media (max-width:1024px){
  .hero-in{grid-template-columns:1fr; gap:40px}
  .hero{padding-top:120px}
  /* hero 变单列后，数据条按三等分铺开并各自居中（原来靠左堆叠，右侧留白可达 600px） */
  .hero-facts{display:grid; grid-template-columns:repeat(3,minmax(0,1fr)); gap:20px 12px; max-width:560px}
  .hero-facts li{min-width:0; align-items:center; text-align:center}
  .seo-wrap{grid-template-columns:1fr}
  .seo-side{position:static}
  .flow{grid-template-columns:repeat(2,1fr)}
  .flow li{border-bottom:1px solid var(--line2)}
  .ct{grid-template-columns:1fr; gap:36px}
  .menu{
    position:fixed; top:var(--nav-h); left:0; right:0; background:#fff; flex-direction:column; align-items:stretch;
    padding:12px 24px 24px; gap:2px; border-bottom:1px solid var(--line);
    transform:translateY(-12px); opacity:0; pointer-events:none; transition:.22s;
    box-shadow:0 20px 40px -24px rgba(16,24,40,.4); max-height:calc(100vh - var(--nav-h)); overflow:auto;
  }
  .menu.open{transform:none; opacity:1; pointer-events:auto}
  .burger{display:block}
  .nav-act{margin-left:auto}
  .nav-act .btn-ghost{display:none}
}
@media (max-width:760px){
  .sec{padding:64px 0}
  .wrap{padding:0 18px}
  .hero{padding-top:104px}
  .hero h1{font-size:26px}
  .lede{font-size:15.5px}
  .hero-cta .btn{flex:1; min-width:150px}
  /* 手机上数据条铺满整行，三等分居中，不再左堆 */
  .hero-facts{gap:8px 10px; max-width:none}
  .hero-facts b{font-size:24px}
  .hero-facts span{font-size:12.5px; line-height:1.35}
  .plat-grid,.ads-grid,.calc,.calc-out,.fld-row,.co-grid{grid-template-columns:1fr}
  .calc-out{border-left:0; border-top:1px solid rgba(255,255,255,.1)}
  .plat header,.plat-body,.plat-foot{padding-left:20px; padding-right:20px}
  .calc-form,.calc-out,.ct-form{padding:22px}
  .flow{grid-template-columns:1fr}
  .flow li{padding:22px 0 22px 18px; border-right:0}
  .flow li::before{top:28px; left:0}
  .ad-flow{padding:20px}
  .qa-q{font-size:16px; padding:18px 0}
  .foot-in{flex-direction:column; gap:20px}
  /* 页脚链接改为两等分铺满，避免两列挤在左侧留出大片空白 */
  .foot-links{display:grid; grid-template-columns:1fr 1fr; gap:22px 18px; width:100%}
  /* 平台占比选择器：2×2 等宽，避免第二行参差不齐 */
  .seg{display:grid; grid-template-columns:1fr 1fr; gap:8px}
  .seg button{padding-left:10px; padding-right:10px}
  .mbar{display:flex}
  body{padding-bottom:70px}
  .sec-head{margin-bottom:36px}
  .hero-card{padding:18px}
}
@media (max-width:400px){
  /* 窄屏再收一档字号，保证「大生态同步运营」这类 7 字标签不折行 */
  .hero-facts{grid-template-columns:repeat(3,minmax(0,1fr)); gap:6px 6px}
  .hero-facts b{font-size:22px}
  .hero-facts span{font-size:11.5px; letter-spacing:-.01em}
  .foot-links{gap:20px 12px}
}

/* ================= 返回顶部 =================
   位置刻意放在右下角咨询按钮的正上方：
   咨询按钮 desktop 是 right:24 bottom:24（60px 高），移动端是 right:14 bottom:84，
   这里各加 60 + 14 的间距，两个按钮不会叠在一起。 */
.back-top{
  position: fixed; right: 24px; bottom: 100px; z-index: 9998;
  width: 44px; height: 44px; border-radius: 50%; padding: 0;
  display: flex; align-items: center; justify-content: center;
  background: #fff; color: var(--brand, #5B5BD6);
  border: 1px solid rgba(91,91,214,.18);
  box-shadow: 0 6px 20px rgba(16,24,40,.14);
  cursor: pointer;
  opacity: 0; transform: translateY(10px) scale(.92); pointer-events: none;
  transition: opacity .22s ease, transform .22s ease, background .2s, color .2s;
}
.back-top.on{ opacity: 1; transform: none; pointer-events: auto; }
.back-top:hover{ background: var(--brand, #5B5BD6); color: #fff; transform: translateY(-2px); }
.back-top:active{ transform: translateY(0) scale(.96); }
.back-top:focus-visible{ outline: 2px solid var(--brand, #5B5BD6); outline-offset: 3px; }
@media (max-width: 760px){
  .back-top{ right: 14px; bottom: calc(158px + env(safe-area-inset-bottom)); width: 40px; height: 40px; }
}
@media (prefers-reduced-motion: reduce){
  .back-top{ transition: none; }
}