:root{
  --ink:#152328;
  --ink2:#2b3a40;
  --teal:#3b7377;
  --teal2:#2d5a5d;
  --red:#df202c;
  --red2:#b7121c;
  --lime:#dfe9bf;
  --cream:#f4f0e8;
  --mist:#f3f6f5;
  --paper:#fff;
  --line:#d8dedc;
  --muted:#6b7672;
  --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,.hero-answer,.section,.final-shell,.footer-shell{width:min(calc(100% - 56px),var(--shell));margin-inline:auto}

.site-header{position:sticky;top:0;z-index:100;background:rgba(21,35,40,.98);border-bottom:1px solid #39484e;backdrop-filter:blur(15px)}
.header-shell{min-height:76px;display:grid;grid-template-columns:255px 1fr 125px;gap:30px;align-items:center}
.brand{width:max-content;display:flex;align-items:center;gap:12px}
.brand-mark{padding:6px 12px;background:#080d0f;border-left:4px solid var(--red)}
.brand-mark img{width:auto;height:29px;object-fit:contain}
.brand-caption{color:#718188;font-size:8px;font-weight:900;letter-spacing:.13em}
.site-nav{display:flex;justify-content:center;gap:28px;color:#b2bdba;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;color:#fff;background:var(--red);font-size:12px;font-weight:900}
.header-cta:hover,.header-cta:focus-visible{background:var(--red2)}
.menu-button{display:none;width:44px;height:44px;background:transparent;border:1px solid #4e5b60}
.menu-button span{display:block;width:19px;height:2px;margin:4px auto;background:#fff}

.hero{background:linear-gradient(90deg,#fff 0 67%,var(--mist) 67% 100%);border-bottom:1px solid var(--line)}
.hero-shell{min-height:630px;display:grid;grid-template-columns:.92fr 1.08fr;gap:85px;align-items:center;padding:76px 0 60px}
.eyebrow,.section-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:780px;font-size:clamp(56px,6.7vw,95px);line-height:.98;letter-spacing:-.064em}
.hero-lead{max-width:760px;margin:28px 0 0;color:#59645f;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:285px;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(--red2)}
.primary-button b{font-size:21px}
.secondary-link{padding-bottom:3px;border-bottom:1px solid currentColor;font-size:13px;font-weight:850}
.hero-device-row{display:grid;grid-template-columns:repeat(3,1fr);margin-top:36px;border-top:1px solid var(--line);border-left:1px solid var(--line)}
.hero-device-row div{padding:13px;border-right:1px solid var(--line);border-bottom:1px solid var(--line)}
.hero-device-row span{display:inline-grid;width:27px;height:27px;place-items:center;color:#fff;background:var(--ink);border-radius:50%;font-size:9px;font-weight:900}
.hero-device-row strong{display:block;margin-top:9px;font-size:12px}
.hero-device-row small{color:#8a9490;font-size:9px}
.hero-visual{margin:0}
.hero-visual img{width:100%;max-height:450px;object-fit:contain}
.hero-visual figcaption{margin-top:12px;color:var(--muted);font-size:10px;text-align:center}
.hero-answer{display:grid;grid-template-columns:120px 250px 1fr;gap:24px;align-items:center;padding:20px 0;border-top:2px solid var(--ink)}
.hero-answer span{color:var(--red);font-size:9px;font-weight:900}
.hero-answer strong{font-size:15px}
.hero-answer p{margin:0;color:var(--muted);font-size:12px}

.section{padding-top:106px;padding-bottom:106px}
.section-head{display:grid;grid-template-columns:78px 1fr;gap:30px;max-width:1060px}
.section-index{color:var(--teal);font-size:56px;font-weight:950;line-height:1}
.section-head h2,.choose-copy h2,.install-copy h2,.network-layout h2,.permission-layout h2,.help-head h2,.final-copy h2{margin:0;font-size:clamp(34px,4.3vw,54px);line-height:1.16;letter-spacing:-.045em}
.section-head > div > p:not(.section-label),.choose-copy > p:not(.section-label),.install-copy > p:not(.section-label),.network-layout > div:first-child > p:not(.section-label),.permission-layout > div > p:not(.section-label),.help-head > p:not(.section-label){margin:20px 0 0;color:var(--muted)}

.mobile-download-section{background:#fff}
.mobile-entry-grid{display:grid;grid-template-columns:1fr 1fr;gap:34px;margin-top:50px}
.mobile-entry-grid article{min-height:340px;padding:31px;border-top:4px solid var(--teal);border-bottom:1px solid var(--line);background:var(--mist)}
.mobile-entry-grid article:last-child{border-top-color:var(--red);background:var(--cream)}
.mobile-entry-grid > article > span{color:var(--red);font-size:9px;font-weight:900;letter-spacing:.12em}
.mobile-entry-grid h3{margin:66px 0 11px;font-size:28px}
.mobile-entry-grid p{margin:0;color:var(--muted)}
.mobile-entry-grid a{display:inline-block;margin-top:31px;padding-bottom:3px;color:var(--red);border-bottom:1px solid currentColor;font-size:12px;font-weight:900}

.choose-section{background:var(--cream)}
.choose-layout{display:grid;grid-template-columns:.84fr 1.16fr;gap:76px;align-items:center}
.choose-copy .section-index,.install-copy .section-index,.network-layout .section-index,.permission-layout .section-index,.help-head .section-index{display:block;margin-bottom:12px}
.system-tabs{display:grid;grid-template-columns:repeat(3,1fr);margin-top:31px;border-top:1px solid #d4cdc1;border-left:1px solid #d4cdc1}
.system-tab{min-height:54px;color:var(--ink);background:transparent;border:0;border-right:1px solid #d4cdc1;border-bottom:1px solid #d4cdc1;cursor:pointer;font-size:11px;font-weight:900}
.system-tab.is-active{color:#fff;background:var(--teal)}
.system-result{padding:27px;background:#fff;border:1px solid #d4cdc1;border-top:0}
.system-result > span{color:var(--red);font-size:8px;font-weight:900;letter-spacing:.12em}
.system-result h3{margin:7px 0 9px;font-size:25px}
.system-result > p{margin:0;color:var(--muted)}
.system-result dl{display:grid;grid-template-columns:repeat(3,1fr);margin:22px 0 0;border-top:1px solid var(--line);border-left:1px solid var(--line)}
.system-result dl div{padding:10px;border-right:1px solid var(--line);border-bottom:1px solid var(--line)}
.system-result dt{color:#909993;font-size:8px;font-weight:900}
.system-result dd{margin:4px 0 0;font-size:10px;font-weight:850}
.choose-visual{margin:0}
.choose-visual img{width:100%;max-height:520px;object-fit:contain}
.choose-visual figcaption{margin-top:11px;color:var(--muted);font-size:10px;text-align:center}

.before-section{background:#fff}
.before-grid{display:grid;grid-template-columns:repeat(4,1fr);margin-top:50px;border-top:1px solid var(--line);border-left:1px solid var(--line)}
.before-grid article{min-height:240px;padding:25px;border-right:1px solid var(--line);border-bottom:1px solid var(--line)}
.before-grid article:nth-child(even){background:var(--mist)}
.before-grid span{color:var(--teal);font-size:9px;font-weight:900;letter-spacing:.12em}
.before-grid h3{margin:50px 0 8px;font-size:19px}
.before-grid 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:80px;align-items:center}
.install-list{margin:32px 0 0;padding:0;list-style:none;border-top:2px solid var(--ink)}
.install-list li{display:grid;grid-template-columns:48px 1fr;gap:18px;padding:17px 0;border-bottom:1px solid var(--line)}
.install-list li > span{color:var(--red);font-size:10px;font-weight:900}
.install-list h3{margin:-4px 0 5px;font-size:17px}
.install-list 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:11px;color:var(--muted);font-size:10px;text-align:center}

.mobile-life-section{background:#fff}
.mobile-life-layout{display:grid;grid-template-columns:1.1fr .9fr;gap:60px;align-items:stretch;margin-top:50px}
.life-main{margin:0;padding:18px;background:var(--ink)}
.life-main img{width:100%;height:100%;max-height:520px;object-fit:contain}
.life-main figcaption{padding-top:11px;color:#87928e;font-size:10px}
.life-notes{border-top:2px solid var(--teal)}
.life-notes article{padding:26px 0;border-bottom:1px solid var(--line)}
.life-notes span{color:var(--red);font-size:8px;font-weight:900;letter-spacing:.12em}
.life-notes h3{margin:6px 0 7px;font-size:20px}
.life-notes p{margin:0;color:var(--muted);font-size:12px}

.network-section{background:var(--teal);color:#fff}
.network-layout{display:grid;grid-template-columns:.72fr 1.28fr;gap:75px;align-items:start}
.network-layout h2{color:#fff}
.network-layout > div:first-child > p:not(.section-label){color:#d2ded9}
.network-layout .section-label{color:#eaf1cd}
.network-layout .section-index{color:#eaf1cd}
.network-table{border-top:1px solid rgba(255,255,255,.35)}
.network-table article{display:grid;grid-template-columns:90px 1fr 1.2fr;gap:22px;padding:22px 0;border-bottom:1px solid rgba(255,255,255,.28)}
.network-table span{color:#eaf1cd;font-size:10px;font-weight:900}
.network-table strong{font-size:13px}
.network-table p{margin:0;color:#d6e0dc;font-size:12px}

.permission-section{background:var(--cream)}
.permission-layout{display:grid;grid-template-columns:1.08fr .92fr;gap:74px;align-items:center}
.permission-layout figure{margin:0}
.permission-layout figure img{width:100%;max-height:500px;object-fit:contain}
.permission-layout ul{margin:27px 0 0;padding:0;list-style:none;border-top:1px solid #d4cdc1}
.permission-layout li{padding:11px 0;border-bottom:1px solid #d4cdc1;font-size:12px;font-weight:800}

.update-section{background:#fff}
.update-grid{display:grid;grid-template-columns:1fr 1fr;gap:50px;margin-top:50px}
.update-grid article{min-height:360px;padding:30px 0;border-top:4px solid var(--teal);border-bottom:1px solid var(--line)}
.update-grid article:last-child{border-top-color:var(--red)}
.update-grid > article > span{color:var(--red);font-size:9px;font-weight:900;letter-spacing:.12em}
.update-grid h3{margin:46px 0 10px;font-size:28px}
.update-grid ol{margin:26px 0 0;padding-left:20px}
.update-grid li{padding:8px 0;border-bottom:1px solid var(--line);font-size:12px;font-weight:800}

.help-section{background:var(--mist)}
.help-head{max-width:970px}
.help-grid{display:grid;grid-template-columns:repeat(3,1fr);margin-top:48px;border-top:1px solid var(--line);border-left:1px solid var(--line)}
.help-grid article{min-height:190px;padding:23px;background:#fff;border-right:1px solid var(--line);border-bottom:1px solid var(--line)}
.help-grid article:nth-child(even){background:var(--cream)}
.help-grid span{color:var(--teal);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}

.faq-section{background:#fff}
.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(--teal);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:var(--cream)}
.related-links{display:grid;grid-template-columns:repeat(3,1fr);margin-top:50px;border-top:1px solid #d4cdc1;border-left:1px solid #d4cdc1}
.related-links a{min-height:140px;display:grid;align-content:center;padding:23px;background:#fff;border-right:1px solid #d4cdc1;border-bottom:1px solid #d4cdc1}
.related-links a:hover,.related-links a:focus-visible{background:var(--mist)}
.related-links strong{color:var(--teal);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(--teal);border-bottom:1px solid var(--line)}
.final-number{width:90px;height:110px;display:grid;place-items:center;align-content:center;color:#fff;background:var(--ink)}
.final-number span{font-size:40px;font-weight:950;line-height:1}
.final-number small{margin-top:5px;color:#b8d7ca;font-size:8px;font-weight:900}
.final-copy p{margin:0 0 9px;color:var(--teal);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;align-items:center;justify-content:space-between;gap:18px;padding:16px 20px;color:#fff;background:var(--red);font-weight:900}
.final-button:hover,.final-button:focus-visible{background:var(--red2)}
.final-button b{font-size:20px}

.site-footer{padding:52px 0 32px;color:#b5c0bc;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:810px;margin:17px 0 0;color:#74807c;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:#52605b;border-top:1px solid #3a4844;font-size:11px}
.mobile-sticky{display:none}

@media(max-width:1080px){
  .header-shell{grid-template-columns:230px 1fr 115px}
  .site-nav{gap:17px}
  .hero-shell{gap:45px}
  .before-grid{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 #4b5954;box-shadow:0 22px 55px rgba(0,0,0,.25)}
  .site-nav.is-open{display:grid}
  .site-nav a{padding:10px 12px}
  .hero{background:#fff}
  .hero-shell{grid-template-columns:1fr}
  .hero-copy{text-align:center}
  .hero-actions{justify-content:center}
  .hero-device-row{max-width:620px;margin-left:auto;margin-right:auto;text-align:left}
  .hero-visual{width:min(100%,720px);margin-inline:auto}
  .hero-answer{grid-template-columns:110px 1fr}
  .hero-answer p{grid-column:2}
  .choose-layout,.install-layout,.network-layout,.permission-layout,.mobile-life-layout{grid-template-columns:1fr}
  .network-table article{grid-template-columns:80px 1fr}
  .network-table p{grid-column:2}
  .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,.hero-answer,.section,.final-shell,.footer-shell{width:min(calc(100% - 28px),var(--shell))}
  .brand-caption{display:none}
  .brand-mark img{height:27px}
  .hero-shell{min-height:0;padding:55px 0 48px}
  .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:center}
  .hero-device-row{grid-template-columns:1fr}
  .hero-answer{grid-template-columns:1fr;gap:6px;text-align:center;padding:17px 0}
  .hero-answer p{grid-column:auto}
  .section{padding-top:72px;padding-bottom:72px}
  .section-head{grid-template-columns:1fr;gap:10px}
  .section-index{font-size:42px}
  .section-head h2,.choose-copy h2,.install-copy h2,.network-layout h2,.permission-layout h2,.help-head h2{font-size:clamp(30px,10vw,41px)}
  .mobile-entry-grid,.system-tabs,.system-result dl,.before-grid,.network-table article,.update-grid,.help-grid,.related-links{grid-template-columns:1fr}
  .mobile-entry-grid{gap:22px}
  .mobile-entry-grid article{min-height:0}
  .mobile-entry-grid h3{margin-top:38px}
  .network-table p{grid-column:auto}
  .life-main{padding:10px}
  .update-grid{gap:22px}
  .update-grid article{min-height:0}
  .help-grid article{min-height:0}
  .faq-list summary{font-size:15px}
  .final-shell{grid-template-columns:1fr;padding:34px 0}
  .final-number{width:76px;height:90px}
  .final-button{grid-column:auto;width:100%}
  .footer-nav{grid-template-columns:1fr 1fr}
  .mobile-sticky{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(21,35,40,.97);border-top:1px solid #43534d}
  .mobile-sticky>div{display:flex;align-items:center;gap:10px}
  .mobile-sticky img{width:75px;height:auto;object-fit:contain}
  .mobile-sticky small,.mobile-sticky strong{display:block;line-height:1.2}
  .mobile-sticky small{color:#778985;font-size:9px}
  .mobile-sticky strong{margin-top:3px;font-size:13px}
  .mobile-sticky>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}
}