:root {
  --ink:#17191d;
  --ink-2:#2b3038;
  --red:#e3212d;
  --red-dark:#b80f1a;
  --blue:#53697c;
  --cream:#f3eee5;
  --cream-2:#ebe3d7;
  --paper:#fff;
  --mist:#f4f5f6;
  --line:#dadde0;
  --muted:#6c7076;
  --white:#fff;
  --shell:1380px;
}

*{box-sizing:border-box}
html{scroll-behavior:smooth;scroll-padding-top:82px}
body{
  margin:0;min-width:320px;color:var(--ink);background:var(--paper);
  font-family:Arial,"Microsoft YaHei","PingFang SC","Segoe UI",sans-serif;
  line-height:1.75;-webkit-font-smoothing:antialiased;text-rendering:optimizeLegibility
}
img{display:block;max-width:100%}
a{color:inherit;text-decoration:none}
button,a{-webkit-tap-highlight-color:transparent}
button{font:inherit}
.skip-link{position:fixed;top:-90px;left:18px;z-index:1000;padding:10px 15px;color:#fff;background:var(--red);font-weight:900}
.skip-link:focus{top:18px}

.header-shell,.hero-shell,.section,.final-shell,.footer-shell{width:min(calc(100% - 56px),var(--shell));margin-inline:auto}

.site-header{position:sticky;top:0;z-index:100;color:#fff;background:rgba(23,25,29,.98);border-bottom:1px solid #353942;backdrop-filter:blur(16px)}
.header-shell{min-height:76px;display:grid;grid-template-columns:260px 1fr 120px;gap:30px;align-items:center}
.brand{width:max-content;display:flex;align-items:center;gap:12px}
.brand-frame{padding:6px 12px;background:#090a0c;border-left:3px solid var(--red)}
.brand-frame img{width:auto;height:30px;object-fit:contain}
.brand small{color:#777f89;font-size:8px;font-weight:900;letter-spacing:.12em}
.site-nav{display:flex;justify-content:center;gap:28px;color:#b6bbc2;font-size:12px;font-weight:800}
.site-nav a{padding:24px 0 22px}
.site-nav a:hover,.site-nav a:focus-visible{color:#fff}
.header-cta{justify-self:end;padding:10px 14px;background:var(--red);font-size:12px;font-weight:900}
.header-cta:hover,.header-cta:focus-visible{background:var(--red-dark)}
.menu-button{display:none;width:44px;height:44px;background:transparent;border:1px solid #4a4f58}
.menu-button span{display:block;width:19px;height:2px;margin:4px auto;background:#fff}

.hero{border-bottom:1px solid var(--line);background:linear-gradient(180deg,#fff 0 78%,var(--cream) 78% 100%)}
.hero-shell{min-height:670px;display:grid;grid-template-columns:80px .82fr 1.18fr;gap:48px;align-items:center;padding:78px 0 66px}
.hero-rail{align-self:stretch;display:flex;flex-direction:column;justify-content:space-between;padding:8px 0;border-right:1px solid var(--line)}
.hero-rail span{color:var(--red);font-size:47px;font-weight:950;line-height:1}
.hero-rail small{color:#92969b;font-size:9px;font-weight:900;letter-spacing:.12em;line-height:1.45}
.eyebrow,.label{margin:0 0 14px;color:var(--red);font-size:10px;font-weight:900;letter-spacing:.16em;text-transform:uppercase}
.hero h1{margin:0;max-width:720px;font-size:clamp(58px,6.7vw,94px);line-height:.98;letter-spacing:-.065em}
.hero-lead{max-width:680px;margin:28px 0 0;color:#565b61;font-size:18px;line-height:1.9}
.hero-actions{display:flex;align-items:center;flex-wrap:wrap;gap:24px;margin-top:34px}
.primary-button{min-width:270px;min-height:60px;display:flex;align-items:center;justify-content:space-between;gap:20px;padding:14px 20px;color:#fff;background:var(--red);font-weight:900}
.primary-button:hover,.primary-button:focus-visible{background:var(--red-dark)}
.primary-button b{font-size:21px}
.secondary-link{padding-bottom:3px;border-bottom:1px solid currentColor;font-size:13px;font-weight:850}
.hero-notes{display:flex;flex-wrap:wrap;gap:22px;margin-top:36px;padding-top:18px;border-top:1px solid var(--line)}
.hero-notes div{display:flex;gap:7px;align-items:center}
.hero-notes b{color:var(--red);font-size:9px}
.hero-notes span{color:#666b71;font-size:10px;font-weight:800}
.hero-visual{margin:0}
.hero-visual img{width:100%;max-height:500px;object-fit:contain}
.hero-visual figcaption{margin-top:12px;color:var(--muted);font-size:10px;text-align:center}

.section{padding-top:108px;padding-bottom:108px}
.section-title{display:grid;grid-template-columns:76px 1fr;gap:30px;max-width:1050px}
.index{color:var(--red);font-size:55px;font-weight:950;line-height:1}
.section-title h2,.device-heading h2,.install-copy h2,.security-layout h2,.help-copy h2,.final-copy h2{margin:0;font-size:clamp(34px,4.2vw,54px);line-height:1.16;letter-spacing:-.045em}
.section-title > div > p:not(.label),.device-heading > p:not(.label),.install-copy > p:not(.label),.security-layout > div > p:not(.label),.help-copy > p:not(.label){margin:20px 0 0;color:var(--muted)}

.direct-section{background:#fff}
.route{display:grid;grid-template-columns:1fr 70px 1fr 70px 1fr;align-items:center;margin-top:52px}
.route article{min-height:185px;padding:26px 0;border-top:3px solid var(--ink);border-bottom:1px solid var(--line)}
.route article:nth-of-type(2){border-top-color:var(--red)}
.route article:nth-of-type(3){border-top-color:var(--blue)}
.route article span{color:var(--red);font-size:9px;font-weight:900;letter-spacing:.12em}
.route article strong{display:block;margin-top:43px;font-size:20px}
.route article p{margin:7px 0 0;color:var(--muted);font-size:12px}
.route-arrow{color:#aaa;text-align:center;font-size:25px}
.route-download{min-height:72px;display:flex;justify-content:space-between;align-items:center;gap:20px;margin-top:27px;padding:17px 22px;color:#fff;background:var(--ink);font-weight:900}
.route-download b{color:#ff9199;font-size:20px}

.device-section{background:var(--cream)}
.device-heading{max-width:930px}
.device-heading .index,.install-copy .index,.security-layout .index,.help-copy .index{display:block;margin-bottom:12px}
.device-switch{display:grid;grid-template-columns:.72fr 1.28fr;margin-top:50px;border-top:2px solid var(--ink)}
.device-list{border-right:1px solid #d4cabd}
.device-tab{width:100%;min-height:118px;display:grid;grid-template-columns:45px 1fr;grid-template-rows:auto auto;gap:2px 14px;align-content:center;padding:20px 24px;color:var(--ink);background:transparent;border:0;border-bottom:1px solid #d4cabd;text-align:left;cursor:pointer}
.device-tab span{grid-row:1/3;color:#a9a195;font-size:11px;font-weight:900}
.device-tab strong{font-size:20px}
.device-tab small{color:#8a837a;font-size:10px}
.device-tab.is-active{color:#fff;background:var(--ink)}
.device-tab.is-active span,.device-tab.is-active small{color:#9fa5ad}
.device-answer{padding:38px;background:#fff;border-bottom:1px solid #d4cabd}
.device-answer > span{color:var(--red);font-size:9px;font-weight:900;letter-spacing:.12em}
.device-answer h3{margin:8px 0 10px;font-size:31px}
.device-answer > p{margin:0;color:var(--muted)}
.device-answer dl{display:grid;grid-template-columns:repeat(3,1fr);margin:28px 0 0;border-top:1px solid var(--line);border-left:1px solid var(--line)}
.device-answer dl div{padding:12px;border-right:1px solid var(--line);border-bottom:1px solid var(--line)}
.device-answer dt{color:#8a8f95;font-size:9px;font-weight:800}
.device-answer dd{margin:4px 0 0;font-size:10px;font-weight:850}
.device-answer > a{display:inline-block;margin-top:24px;padding-bottom:3px;color:var(--red);border-bottom:1px solid currentColor;font-size:12px;font-weight:900}

.precheck-section{background:#fff}
.precheck-list{display:grid;grid-template-columns:repeat(4,1fr);margin-top:50px;border-top:1px solid var(--line);border-left:1px solid var(--line)}
.precheck-list article{min-height:235px;padding:26px;border-right:1px solid var(--line);border-bottom:1px solid var(--line)}
.precheck-list article:nth-child(even){background:var(--mist)}
.precheck-list b{color:var(--red);font-size:10px}
.precheck-list h3{margin:48px 0 9px;font-size:19px}
.precheck-list p{margin:0;color:var(--muted);font-size:12px}

.install-section{background:var(--mist)}
.install-layout{display:grid;grid-template-columns:.9fr 1.1fr;gap:78px;align-items:center}
.install-steps{margin:34px 0 0;padding:0;list-style:none;border-top:2px solid var(--ink)}
.install-steps li{display:grid;grid-template-columns:50px 1fr;gap:18px;padding:18px 0;border-bottom:1px solid var(--line)}
.install-steps li > span{color:var(--red);font-size:11px;font-weight:950}
.install-steps h3{margin:-4px 0 6px;font-size:17px}
.install-steps p{margin:0;color:var(--muted);font-size:12px}
.install-visual{margin:0}
.install-visual img{width:100%;max-height:500px;object-fit:contain}
.install-visual figcaption{margin-top:12px;color:var(--muted);font-size:10px;text-align:center}

.client-section{background:#fff}
.feature-gallery{display:grid;grid-template-columns:1.05fr .95fr;gap:24px;margin-top:52px}
.feature-gallery figure{margin:0}
.feature-main{grid-row:span 2;border:1px solid var(--line)}
.feature-main img{width:100%;aspect-ratio:1.38/1;object-fit:cover}
.feature-main figcaption{padding:24px}
.feature-main span,.feature-note span{color:var(--red);font-size:9px;font-weight:900;letter-spacing:.1em}
.feature-main strong{display:block;margin-top:6px;font-size:21px}
.feature-main p{margin:7px 0 0;color:var(--muted)}
.feature-note{min-height:210px;display:grid;grid-template-columns:110px 1fr;gap:22px;align-items:center;padding:25px;background:var(--cream)}
.feature-note img{width:100px;height:100px;object-fit:contain}
.feature-note h3{margin:6px 0 8px;font-size:20px}
.feature-note p{margin:0;color:var(--muted);font-size:12px}
.feature-reward{border:1px solid var(--line)}
.feature-reward img{width:100%;aspect-ratio:1.85/1;object-fit:cover}
.feature-reward figcaption{padding:13px 18px;color:var(--muted);font-size:10px}

.security-section{background:var(--ink);color:#fff}
.security-layout{display:grid;grid-template-columns:1.12fr .88fr;gap:76px;align-items:center}
.security-layout figure{margin:0}
.security-layout figure img{width:100%;max-height:490px;object-fit:contain}
.security-layout h2{color:#fff}
.security-layout > div > p:not(.label){color:#b5bac1}
.security-rules{margin-top:30px;border-top:1px solid #484c54}
.security-rules article{display:grid;grid-template-columns:38px 1fr;gap:13px;padding:13px 0;border-bottom:1px solid #484c54}
.security-rules b{color:#ff737c;font-size:10px}
.security-rules span{color:#d3d5d9;font-size:12px}

.help-section{background:var(--cream)}
.help-copy{max-width:990px}
.help-grid{display:grid;grid-template-columns:repeat(3,1fr);margin-top:42px;border-top:1px solid #d4cabd;border-left:1px solid #d4cabd}
.help-grid article{min-height:190px;padding:24px;border-right:1px solid #d4cabd;border-bottom:1px solid #d4cabd}
.help-grid article:nth-child(2),.help-grid article:nth-child(4),.help-grid article:nth-child(6){background:rgba(255,255,255,.45)}
.help-grid span{color:var(--red);font-size:9px;font-weight:900}
.help-grid h3{margin:26px 0 8px;font-size:18px}
.help-grid p{margin:0;color:var(--muted);font-size:12px}
.help-visual{margin:48px 0 0}
.help-visual img{width:100%;max-height:520px;object-fit:cover}
.help-visual figcaption{margin-top:12px;color:var(--muted);font-size:10px}

.update-section{background:#fff}
.update-columns{display:grid;grid-template-columns:1fr 1fr;gap:52px;margin-top:50px}
.update-columns article{min-height:350px;padding:30px 0;border-top:4px solid var(--ink);border-bottom:1px solid var(--line)}
.update-columns article:last-child{border-top-color:var(--red)}
.update-columns > article > span{color:var(--red);font-size:9px;font-weight:900;letter-spacing:.12em}
.update-columns h3{margin:46px 0 11px;font-size:28px}
.update-columns ol{margin:25px 0 0;padding-left:20px}
.update-columns li{padding:8px 0;border-bottom:1px solid var(--line);font-size:12px;font-weight:800}

.faq-section{background:var(--mist)}
.faq-list{margin-top:50px;border-top:2px solid var(--ink)}
.faq-list details{border-bottom:1px solid var(--line)}
.faq-list summary{position:relative;padding:24px 55px 24px 0;font-size:16px;font-weight:850;cursor:pointer;list-style:none}
.faq-list summary::-webkit-details-marker{display:none}
.faq-list summary span{position:absolute;right:4px;top:20px;width:30px;height:30px;display:grid;place-items:center;color:var(--red);border:1px solid var(--line);border-radius:50%;transition:transform .2s ease}
.faq-list details[open] summary span{transform:rotate(45deg)}
.faq-list p{margin:-2px 0 23px;color:var(--muted)}

.related-section{background:#fff}
.related-links{display:grid;grid-template-columns:repeat(3,1fr);margin-top:50px;border-top:1px solid var(--line);border-left:1px solid var(--line)}
.related-links a{min-height:140px;display:grid;align-content:center;padding:23px;border-right:1px solid var(--line);border-bottom:1px solid var(--line)}
.related-links a:hover,.related-links a:focus-visible{background:var(--cream)}
.related-links strong{color:var(--red);font-size:15px}
.related-links span{margin-top:6px;color:var(--muted);font-size:11px}

.final-section{background:#fff}
.final-shell{min-height:285px;display:grid;grid-template-columns:110px 1fr 220px;gap:42px;align-items:center;padding:44px 0;border-top:5px solid var(--ink);border-bottom:1px solid var(--line)}
.final-stamp{width:90px;height:110px;display:grid;place-items:center;align-content:center;color:#fff;background:var(--red)}
.final-stamp span{font-size:40px;font-weight:950;line-height:1}
.final-stamp small{margin-top:5px;font-size:8px;font-weight:900}
.final-copy p{margin:0 0 9px;color:var(--red);font-size:9px;font-weight:900;letter-spacing:.13em}
.final-copy h2{font-size:clamp(29px,3.6vw,44px)}
.final-copy span{display:block;margin-top:13px;color:var(--muted);font-size:11px}
.final-button{min-height:70px;display:flex;justify-content:space-between;align-items:center;gap:18px;padding:16px 20px;color:#fff;background:var(--ink);font-weight:900}
.final-button:hover,.final-button:focus-visible{background:var(--red)}
.final-button b{font-size:20px}

.site-footer{padding:52px 0 32px;color:#b4b8bf;background:var(--ink)}
.footer-shell{display:grid;grid-template-columns:1fr auto;gap:32px 55px}
.footer-brand img{width:auto;height:34px;object-fit:contain}
.footer-brand p{max-width:800px;margin:17px 0 0;color:#767b83;font-size:11px}
.footer-nav{display:grid;grid-template-columns:repeat(2,auto);gap:8px 25px;font-size:12px;font-weight:700}
.footer-nav a:hover,.footer-nav a:focus-visible{color:#fff}
.copyright{grid-column:1/-1;margin:5px 0 0;padding-top:21px;color:#555b62;border-top:1px solid #393d44;font-size:11px}
.mobile-download{display:none}

@media(max-width:1080px){
  .header-shell{grid-template-columns:235px 1fr 110px}
  .site-nav{gap:17px}
  .hero-shell{grid-template-columns:65px .9fr 1.1fr;gap:32px}
  .precheck-list{grid-template-columns:repeat(2,1fr)}
}
@media(max-width:820px){
  html{scroll-padding-top:72px}
  .header-shell{min-height:70px;grid-template-columns:1fr auto}
  .header-cta{display:none}
  .menu-button{display:block}
  .site-nav{position:absolute;left:20px;right:20px;top:calc(100% + 8px);display:none;padding:10px;background:var(--ink);border:1px solid #444952;box-shadow:0 22px 55px rgba(0,0,0,.28)}
  .site-nav.is-open{display:grid}
  .site-nav a{padding:10px 12px}
  .hero{background:#fff}
  .hero-shell{grid-template-columns:58px 1fr}
  .hero-visual{grid-column:1/-1;width:min(100%,720px);margin-inline:auto}
  .route{grid-template-columns:1fr}
  .route-arrow{transform:rotate(90deg);padding:10px}
  .device-switch{grid-template-columns:1fr}
  .device-list{display:grid;grid-template-columns:repeat(3,1fr);border-right:0}
  .device-tab{grid-template-columns:1fr;grid-template-rows:auto auto auto;text-align:center}
  .device-tab span{grid-row:auto}
  .install-layout,.security-layout{grid-template-columns:1fr}
  .feature-gallery{grid-template-columns:1fr}
  .feature-main{grid-row:auto}
  .help-grid{grid-template-columns:repeat(2,1fr)}
  .final-shell{grid-template-columns:100px 1fr}
  .final-button{grid-column:2;width:220px}
  .footer-shell{grid-template-columns:1fr}
  .copyright{grid-column:auto}
}
@media(max-width:600px){
  body{padding-bottom:70px}
  .header-shell,.hero-shell,.section,.final-shell,.footer-shell{width:min(calc(100% - 28px),var(--shell))}
  .brand small{display:none}
  .brand-frame img{height:28px}
  .hero-shell{min-height:0;grid-template-columns:1fr;padding:56px 0 50px}
  .hero-rail{min-height:44px;flex-direction:row;border-right:0;border-bottom:1px solid var(--line)}
  .hero-rail span{font-size:36px}
  .hero h1{font-size:clamp(46px,14vw,66px)}
  .hero-lead{font-size:16px}
  .hero-actions{display:grid}
  .primary-button{min-width:0;width:100%}
  .secondary-link{justify-self:start}
  .section{padding-top:72px;padding-bottom:72px}
  .section-title{grid-template-columns:1fr;gap:10px}
  .index{font-size:42px}
  .section-title h2,.device-heading h2,.install-copy h2,.security-layout h2,.help-copy h2{font-size:clamp(30px,10vw,41px)}
  .device-list,.device-answer dl,.precheck-list,.help-grid,.update-columns,.related-links{grid-template-columns:1fr}
  .device-tab{min-height:85px}
  .device-answer{padding:24px}
  .precheck-list article{min-height:0}
  .feature-note{grid-template-columns:75px 1fr}
  .feature-note img{width:65px;height:65px}
  .help-grid article{min-height:0}
  .update-columns{gap:22px}
  .update-columns article{min-height:0}
  .faq-list summary{font-size:15px}
  .final-shell{grid-template-columns:1fr;padding:34px 0}
  .final-stamp{width:76px;height:90px}
  .final-button{grid-column:auto;width:100%}
  .footer-nav{grid-template-columns:1fr 1fr}
  .mobile-download{position:fixed;left:0;right:0;bottom:0;z-index:120;min-height:70px;display:flex;justify-content:space-between;align-items:center;gap:12px;padding:9px 14px;color:#fff;background:rgba(23,25,29,.97);border-top:1px solid #454952}
  .mobile-download>div{display:flex;align-items:center;gap:10px}
  .mobile-download img{width:75px;height:auto;object-fit:contain}
  .mobile-download small,.mobile-download strong{display:block;line-height:1.2}
  .mobile-download small{color:#777e86;font-size:9px}
  .mobile-download strong{margin-top:3px;font-size:13px}
  .mobile-download>a{padding:11px 15px;color:#fff;background:var(--red);font-size:13px;font-weight:900}
}
@media(prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  *,*::before,*::after{transition-duration:.01ms!important}
}