:root{
  --bg:#0A0F1E; --bg2:#0C1424; --card:#111A2E; --card2:#0E1526;
  --line:rgba(148,163,184,.14); --line2:rgba(148,163,184,.22);
  --txt:#E2E8F0; --txt2:#94A3B8; --txt3:#64748B;
  --blue:#3B82F6; --cyan:#22D3EE; --ok:#34D399; --warn:#FBBF24;
  --grad:linear-gradient(135deg,#3B82F6 0%,#22D3EE 100%);
}
*{margin:0;padding:0;box-sizing:border-box}
html{scroll-behavior:smooth}
body{
  font-family:"Inter","HarmonyOS Sans SC","MiSans",-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Hiragino Sans GB","Microsoft YaHei",sans-serif;
  background:var(--bg); color:var(--txt); line-height:1.65; font-size:15.5px;
  background-image:
    radial-gradient(900px 480px at 85% -140px, rgba(59,130,246,.16), transparent 65%),
    radial-gradient(700px 420px at -10% 30%, rgba(34,211,238,.08), transparent 60%);
  background-attachment:fixed;
}
a{color:var(--cyan);text-decoration:none}
.wrap{max-width:1120px;margin:0 auto;padding:0 22px}
h1,h2,h3{line-height:1.25;letter-spacing:-.01em}

/* header */
header{position:sticky;top:0;z-index:50;background:rgba(10,15,30,.82);backdrop-filter:blur(14px);border-bottom:1px solid var(--line)}
.nav{display:flex;align-items:center;justify-content:space-between;height:62px}
.logo{display:flex;align-items:center;gap:10px;font-weight:800;font-size:16.5px;color:var(--txt)}
.logo .mark{width:32px;height:32px;border-radius:9px;background:var(--grad);display:flex;align-items:center;justify-content:center;font-size:15px;font-weight:900;color:#fff}
.nav-links{display:flex;gap:22px;font-size:14px;font-weight:600;color:var(--txt2)}
.nav-links a{color:inherit;transition:color .15s}
.nav-links a:hover{color:var(--txt)}
.nav-cta{background:var(--grad);color:#fff;font-size:13.5px;font-weight:800;padding:9px 18px;border-radius:999px}
.nav-cta:hover{filter:brightness(1.12)}

/* buttons */
.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;padding:13px 26px;border-radius:12px;font-size:15px;font-weight:800;cursor:pointer;border:none;transition:transform .15s,filter .15s}
.btn:hover{transform:translateY(-2px);filter:brightness(1.1)}
.btn-grad{background:var(--grad);color:#fff}
.btn-line{background:transparent;color:var(--txt);border:1.5px solid var(--line2)}
.btn-ghost{background:var(--card);color:var(--txt);border:1px solid var(--line)}

/* hero */
.hero{padding:76px 0 60px}
.hero-grid{display:grid;grid-template-columns:1.15fr .95fr;gap:44px;align-items:center}
.pill{display:inline-flex;align-items:center;gap:8px;font-size:12.5px;font-weight:700;color:var(--cyan);background:rgba(34,211,238,.1);border:1px solid rgba(34,211,238,.28);padding:6px 14px;border-radius:999px}
.hero h1{font-size:clamp(34px,4.6vw,54px);font-weight:900;margin:18px 0 16px}
.hero h1 .grad{background:var(--grad);-webkit-background-clip:text;background-clip:text;color:transparent}
.hero .sub{color:var(--txt2);font-size:16px;max-width:520px}
.hero-ctas{display:flex;gap:12px;margin-top:28px;flex-wrap:wrap}
.trust{display:flex;gap:22px;margin-top:30px;flex-wrap:wrap}
.trust .t{display:flex;align-items:center;gap:8px;font-size:13px;color:var(--txt2);font-weight:600}

/* order card */
.order-card{background:linear-gradient(180deg,rgba(59,130,246,.06),rgba(17,26,46,.9));border:1px solid var(--line2);border-radius:20px;padding:26px;box-shadow:0 24px 60px rgba(2,6,18,.5)}
.order-card h3{font-size:16px;font-weight:800;display:flex;align-items:center;gap:8px;margin-bottom:16px}
.plan-row{display:flex;align-items:center;justify-content:space-between;padding:13px 15px;border:1.5px solid var(--line);border-radius:13px;margin-bottom:10px;cursor:pointer;transition:border-color .15s,background .15s}
.plan-row:hover{border-color:var(--line2)}
.plan-row.sel{border-color:var(--blue);background:rgba(59,130,246,.08)}
.plan-row .nm{font-weight:800;font-size:14.5px}
.plan-row .nm small{display:block;font-weight:600;color:var(--txt3);font-size:11.5px}
.plan-row .pr{font-weight:900;font-size:17px;color:var(--cyan)}
.order-card input{width:100%;background:var(--bg2);border:1.5px solid var(--line);border-radius:12px;color:var(--txt);font-size:14.5px;padding:12px 14px;margin:12px 0;outline:none}
.order-card input:focus{border-color:var(--blue)}
.order-card .btn{width:100%}
.order-note{font-size:12px;color:var(--txt3);margin-top:10px;text-align:center}
.ok-box{display:none;text-align:center;padding:18px 6px}
.ok-box .big{font-size:38px}
.ok-box .oid{font-family:ui-monospace,monospace;color:var(--cyan);font-weight:800;font-size:17px;margin:8px 0}
.ok-box p{font-size:13px;color:var(--txt2)}

/* sections */
section{padding:74px 0}
.sec-head{text-align:center;max-width:620px;margin:0 auto 46px}
.sec-head .k{font-size:12px;font-weight:800;letter-spacing:.22em;color:var(--cyan);text-transform:uppercase}
.sec-head h2{font-size:clamp(26px,3.6vw,38px);font-weight:900;margin:10px 0 12px}
.sec-head p{color:var(--txt2);font-size:15px}

/* pricing */
.plans{display:grid;grid-template-columns:repeat(3,1fr);gap:18px}
.plan{position:relative;background:var(--card);border:1px solid var(--line);border-radius:20px;padding:28px 24px;display:flex;flex-direction:column;transition:transform .2s,border-color .2s}
.plan:hover{transform:translateY(-4px);border-color:var(--line2)}
.plan.hot{border:1.5px solid transparent;background:linear-gradient(var(--card),var(--card)) padding-box,var(--grad) border-box}
.plan .tag{position:absolute;top:-12px;left:50%;transform:translateX(-50%);background:var(--grad);color:#fff;font-size:11.5px;font-weight:800;padding:4px 14px;border-radius:999px;white-space:nowrap}
.plan .lvl{font-size:12px;font-weight:800;color:var(--txt3);letter-spacing:.1em}
.plan h3{font-size:30px;font-weight:900;margin:4px 0 2px}
.plan .quota{font-size:12.5px;color:var(--txt2);margin-bottom:14px}
.plan .price{display:flex;align-items:baseline;gap:7px;margin-bottom:4px}
.plan .price .cur{font-size:14px;font-weight:800;color:var(--txt2)}
.plan .price .num{font-size:42px;font-weight:900;letter-spacing:-.02em}
.plan .price .usd{font-size:13px;color:var(--txt3)}
.plan ul{list-style:none;margin:14px 0 20px;flex:1}
.plan li{font-size:13.5px;color:var(--txt2);padding:4.5px 0 4.5px 24px;position:relative}
.plan li::before{content:"✓";position:absolute;left:0;top:5px;font-size:11px;font-weight:900;color:var(--ok)}
.pay-note{display:flex;gap:10px;justify-content:center;flex-wrap:wrap;margin-top:24px;font-size:12.5px;color:var(--txt2)}
.pay-note span{background:var(--card);border:1px solid var(--line);border-radius:999px;padding:6px 14px;font-weight:700}

/* steps timeline */
.steps{display:grid;grid-template-columns:repeat(4,1fr);gap:0;position:relative}
.step{padding:0 18px;text-align:center;position:relative}
.step .no{width:44px;height:44px;border-radius:50%;background:var(--card);border:2px solid var(--blue);color:var(--cyan);font-weight:900;font-size:15px;display:flex;align-items:center;justify-content:center;margin:0 auto 14px;position:relative;z-index:2}
.steps::before{content:"";position:absolute;top:22px;left:12%;right:12%;height:2px;background:linear-gradient(90deg,rgba(59,130,246,.5),rgba(34,211,238,.5))}
.step h3{font-size:15.5px;font-weight:800;margin-bottom:6px}
.step p{font-size:13px;color:var(--txt2)}

/* testimonials */
.testis{display:grid;grid-template-columns:repeat(3,1fr);gap:16px}
.tcard{background:var(--card);border:1px solid var(--line);border-radius:16px;padding:22px}
.tcard .stars{color:var(--warn);font-size:13px;letter-spacing:2px;margin-bottom:8px}
.tcard p{font-size:13.5px;color:var(--txt2)}
.tmeta{display:flex;align-items:center;gap:11px;margin-top:16px}
.tmeta .av{width:36px;height:36px;border-radius:50%;background:var(--grad);color:#fff;font-size:12px;font-weight:900;display:flex;align-items:center;justify-content:center}
.tmeta .nm{font-size:13px;font-weight:800}
.tmeta .rg{font-size:11.5px;color:var(--txt3)}

/* faq */
.faq{max-width:760px;margin:0 auto}
details{background:var(--card);border:1px solid var(--line);border-radius:14px;margin-bottom:10px;overflow:hidden}
summary{cursor:pointer;list-style:none;display:flex;justify-content:space-between;align-items:center;padding:16px 20px;font-size:15px;font-weight:700}
summary::-webkit-details-marker{display:none}
summary::after{content:"+";font-size:19px;color:var(--txt3);transition:transform .2s}
details[open] summary::after{transform:rotate(45deg);color:var(--cyan)}
details .body{padding:0 20px 18px;font-size:14px;color:var(--txt2)}

/* final cta */
.final{text-align:center;background:linear-gradient(180deg,rgba(59,130,246,.12),rgba(34,211,238,.06));border:1px solid var(--line2);border-radius:24px;padding:60px 28px}
.final h2{font-size:clamp(26px,3.8vw,40px);font-weight:900;margin-bottom:24px}

/* footer */
footer{border-top:1px solid var(--line);background:var(--bg2);padding:52px 0 30px;font-size:13.5px}
.fgrid{display:grid;grid-template-columns:2.2fr 1fr 1fr 1fr 1fr;gap:30px}
.fbrand p{color:var(--txt3);font-size:12.3px;margin-top:14px;line-height:1.75}
footer h4{font-size:13px;font-weight:800;margin-bottom:12px;color:var(--txt)}
footer ul{list-style:none}
footer ul li{margin-bottom:9px}
footer ul a{color:var(--txt2)}
footer ul a:hover{color:var(--cyan)}
.fbottom{border-top:1px solid var(--line);margin-top:36px;padding-top:22px;display:flex;justify-content:space-between;flex-wrap:wrap;gap:12px;color:var(--txt3);font-size:12.5px}

/* float kefu */
.kf{position:fixed;right:20px;bottom:24px;z-index:60;width:54px;height:54px;border-radius:50%;background:var(--grad);color:#fff;display:flex;align-items:center;justify-content:center;font-size:12.5px;font-weight:900;box-shadow:0 14px 34px rgba(59,130,246,.45);cursor:pointer;border:none}

/* modal */
.modal{display:none;position:fixed;inset:0;z-index:99;background:rgba(4,8,18,.72);backdrop-filter:blur(6px);align-items:center;justify-content:center;padding:20px}
.modal.show{display:flex}
.modal .mbox{background:var(--card);border:1px solid var(--line2);border-radius:20px;max-width:380px;width:100%;padding:28px;text-align:center}
.modal img{width:210px;height:auto;border-radius:14px;margin:14px 0}
.modal .wx{font-weight:900;font-size:17px;color:var(--cyan)}
.modal .close{margin-top:14px}

/* ===== 子页面 doc 样式 =====
.sub{padding:56px 0 70px}
.crumbs{font-size:13px;color:var(--txt3);margin-bottom:22px}
.crumbs a{color:var(--txt3)}
.crumbs a:hover{color:var(--cyan)}
.doc-head{border-bottom:1px solid var(--line);padding-bottom:26px;margin-bottom:36px}
.doc-head h1{font-size:clamp(28px,4vw,40px);font-weight:900;margin-bottom:10px}
.doc-head .meta{font-size:13px;color:var(--txt3)}
.doc h2{font-size:20px;font-weight:800;margin:34px 0 12px;padding-left:14px;border-left:3px solid var(--blue)}
.doc h3{font-size:16px;font-weight:800;margin:22px 0 8px}
.doc p{color:var(--txt2);font-size:14.5px;margin-bottom:10px}
.doc ul,.doc ol{color:var(--txt2);font-size:14.5px;padding-left:22px;margin-bottom:12px}
.doc li{margin-bottom:6px}
.doc .note{background:rgba(59,130,246,.08);border:1px solid rgba(59,130,246,.25);border-radius:12px;padding:14px 18px;font-size:13.5px;color:var(--txt2);margin:16px 0}
.doc .note b{color:var(--cyan)}
.link-cards{display:grid;grid-template-columns:repeat(3,1fr);gap:16px;margin-top:8px}
.lcard{display:block;background:var(--card);border:1px solid var(--line);border-radius:16px;padding:24px;transition:transform .18s,border-color .18s}
.lcard:hover{transform:translateY(-3px);border-color:var(--blue)}
.lcard h3{font-size:16px;font-weight:800;margin-bottom:6px;color:var(--txt)}
.lcard p{font-size:13px;color:var(--txt2)}
.lcard .go{font-size:13px;font-weight:800;color:var(--cyan);margin-top:12px;display:inline-block}
.tstep{display:flex;gap:18px;margin-bottom:8px}
.tstep .n{flex:0 0 40px;height:40px;border-radius:12px;background:var(--grad);color:#fff;font-weight:900;display:flex;align-items:center;justify-content:center;font-size:15px}
.tstep .body{padding-bottom:22px;border-bottom:1px dashed var(--line)}
.tstep .body h3{font-size:15.5px;font-weight:800;margin:8px 0 6px}
.tstep .body p{font-size:13.8px;color:var(--txt2)}
.qr-show{display:flex;gap:24px;align-items:center;flex-wrap:wrap;background:var(--card);border:1px solid var(--line);border-radius:18px;padding:26px;margin-top:18px}
.qr-show img{width:190px;border-radius:14px}
.qr-show .wxid{font-size:22px;font-weight:900;color:var(--cyan)}

@media(max-width:900px){
  .hero-grid{grid-template-columns:1fr}
  .plans,.testis{grid-template-columns:1fr}
  .steps{grid-template-columns:1fr 1fr;gap:26px 0}
  .steps::before{display:none}
  .link-cards{grid-template-columns:1fr}
  .fgrid{grid-template-columns:1fr 1fr}
  .nav-links{display:none}
}