:root{
  --ink:#17202b;
  --ink2:#283545;
  --amber:#c88927;
  --amber2:#9f6712;
  --red:#df202c;
  --red2:#b6121c;
  --bluegray:#7b8b9b;
  --paper:#fff;
  --soft:#f3f4f5;
  --warm:#f4efe6;
  --line:#d9dde1;
  --muted:#6d747c;
  --shell:1390px;
}
*{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-grid,.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(255,255,255,.97);border-bottom:1px solid var(--line);backdrop-filter:blur(15px)}
.header-shell{min-height:76px;display:grid;grid-template-columns:260px 1fr 125px;gap:30px;align-items:center}
.brand{width:max-content;display:flex;align-items:center;gap:12px}
.brand-panel{padding:6px 12px;background:var(--ink);border-bottom:3px solid var(--amber)}
.brand-panel img{width:auto;height:29px;object-fit:contain}
.brand-caption{color:#8b9299;font-size:8px;font-weight:900;letter-spacing:.13em}
.site-nav{display:flex;justify-content:center;gap:28px;color:#656c74;font-size:12px;font-weight:800}
.site-nav a{padding:24px 0 22px}
.site-nav a:hover,.site-nav a:focus-visible{color:var(--amber2)}
.header-cta{justify-self:end;padding:10px 14px;color:#fff;background:var(--ink);font-size:12px;font-weight:900}
.header-cta:hover,.header-cta:focus-visible{background:var(--red)}
.menu-button{display:none;width:44px;height:44px;background:#fff;border:1px solid var(--line)}
.menu-button span{display:block;width:19px;height:2px;margin:4px auto;background:var(--ink)}

.hero{overflow:hidden;background:linear-gradient(90deg,#fff 0 72%,var(--soft) 72% 100%);border-bottom:1px solid var(--line)}
.hero-grid{min-height:650px;display:grid;grid-template-columns:72px .86fr 1.14fr;gap:48px;align-items:center;padding:78px 0 58px}
.hero-index{align-self:stretch;display:flex;flex-direction:column;justify-content:space-between;padding:6px 0;border-right:1px solid var(--line)}
.hero-index span{color:var(--amber);font-size:47px;font-weight:950;line-height:1}
.hero-index small{color:#959ba1;font-size:8px;font-weight:900;letter-spacing:.13em;line-height:1.5}
.eyebrow,.section-label{margin:0 0 14px;color:var(--amber2);font-size:10px;font-weight:900;letter-spacing:.16em;text-transform:uppercase}
.hero h1{margin:0;max-width:780px;font-size:clamp(55px,6.5vw,92px);line-height:.98;letter-spacing:-.065em}
.hero-lead{max-width:720px;margin:28px 0 0;color:#59616a;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:290px;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-meta{display:grid;grid-template-columns:repeat(3,1fr);margin:36px 0 0;border-top:1px solid var(--line);border-left:1px solid var(--line)}
.hero-meta div{padding:11px 12px;border-right:1px solid var(--line);border-bottom:1px solid var(--line)}
.hero-meta dt{color:#959ca3;font-size:8px;font-weight:900}
.hero-meta dd{margin:3px 0 0;font-size:10px;font-weight:900}
.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}
.hero-answer{display:grid;grid-template-columns:110px 265px 1fr;gap:22px;align-items:center;padding:19px 0;border-top:2px solid var(--ink)}
.hero-answer span{color:var(--amber2);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:1070px}
.section-index{color:var(--amber);font-size:56px;font-weight:950;line-height:1}
.section-head h2,.precheck-copy h2,.workspace-intro h2,.screen-copy h2,.hud-layout h2,.update-layout h2,.help-head h2,.final-copy h2{margin:0;font-size:clamp(34px,4.2vw,54px);line-height:1.16;letter-spacing:-.045em}
.section-head > div > p:not(.section-label),.precheck-copy > p:not(.section-label),.workspace-intro > p:not(.section-label),.screen-copy > p:not(.section-label),.hud-layout > div > p:not(.section-label),.update-layout > div:first-child > p:not(.section-label),.help-head > p:not(.section-label){margin:20px 0 0;color:var(--muted)}

.download-section{background:#fff}
.desktop-entry{display:grid;grid-template-columns:1fr 1fr 260px;margin-top:50px;border-top:2px solid var(--ink);border-left:1px solid var(--line)}
.desktop-entry > div{min-height:160px;display:grid;align-content:center;padding:24px;border-right:1px solid var(--line);border-bottom:1px solid var(--line)}
.desktop-entry > div > span{color:var(--amber2);font-size:9px;font-weight:900;letter-spacing:.12em}
.desktop-entry strong{margin-top:7px;font-size:18px}
.desktop-entry p{margin:5px 0 0;color:var(--muted);font-size:11px}
.desktop-entry > a{min-height:160px;display:flex;align-items:center;justify-content:space-between;gap:15px;padding:24px;color:#fff;background:var(--ink);font-weight:900}
.desktop-entry > a:hover,.desktop-entry > a:focus-visible{background:var(--red)}
.desktop-entry > a b{font-size:20px}

.precheck-section{background:var(--warm)}
.precheck-layout{display:grid;grid-template-columns:.72fr 1.28fr;gap:76px;align-items:start}
.precheck-copy .section-index,.workspace-intro .section-index,.screen-copy .section-index,.hud-layout .section-index,.update-layout .section-index,.help-head .section-index{display:block;margin-bottom:12px}
.precheck-list{border-top:2px solid var(--ink)}
.precheck-list article{display:grid;grid-template-columns:50px 1fr;gap:17px;padding:19px 0;border-bottom:1px solid #d6cdbf}
.precheck-list span{color:var(--amber2);font-size:10px;font-weight:900}
.precheck-list h3{margin:-3px 0 5px;font-size:17px}
.precheck-list p{margin:0;color:var(--muted);font-size:12px}

.install-section{background:#fff}
.install-track{display:grid;grid-template-columns:repeat(5,1fr);margin:50px 0 0;padding:0;list-style:none;border-top:2px solid var(--ink);border-left:1px solid var(--line)}
.install-track li{min-height:255px;padding:25px;border-right:1px solid var(--line);border-bottom:1px solid var(--line)}
.install-track li:nth-child(even){background:var(--soft)}
.install-track span{color:var(--amber);font-size:28px;font-weight:950}
.install-track h3{margin:48px 0 8px;font-size:18px}
.install-track p{margin:0;color:var(--muted);font-size:12px}

.workspace-section{background:var(--soft)}
.workspace-intro{max-width:980px}
.workspace-gallery{display:grid;grid-template-columns:1.25fr .75fr;grid-template-rows:1fr 1fr;gap:24px;margin-top:50px}
.workspace-gallery figure{margin:0;background:#fff;border:1px solid var(--line)}
.workspace-gallery img{width:100%;height:100%;object-fit:cover}
.workspace-main{grid-row:1/3}
.workspace-main img{min-height:420px}
.workspace-main figcaption{padding:23px}
.workspace-main figcaption span{color:var(--amber2);font-size:9px;font-weight:900;letter-spacing:.12em}
.workspace-main figcaption strong{display:block;margin-top:6px;font-size:20px}
.workspace-main figcaption p{margin:6px 0 0;color:var(--muted);font-size:12px}
.workspace-gallery > figure:not(.workspace-main){display:grid;grid-template-columns:1.15fr .85fr;align-items:center}
.workspace-gallery > figure:not(.workspace-main) img{min-height:0;aspect-ratio:1.38/1}
.workspace-gallery > figure:not(.workspace-main) figcaption{padding:16px;color:var(--muted);font-size:10px}

.screen-section{background:#fff}
.screen-layout{display:grid;grid-template-columns:.86fr 1.14fr;gap:78px;align-items:center}
.screen-rules{margin-top:30px;border-top:2px solid var(--ink)}
.screen-rules article{display:grid;grid-template-columns:38px 1fr;gap:13px;padding:12px 0;border-bottom:1px solid var(--line)}
.screen-rules b{color:var(--amber2);font-size:10px}
.screen-rules span{color:#555d65;font-size:12px}
.screen-visual{margin:0}
.screen-visual img{width:100%;max-height:500px;object-fit:contain}
.screen-visual figcaption{margin-top:11px;color:var(--muted);font-size:10px;text-align:center}

.hud-section{background:var(--ink);color:#fff}
.hud-layout{display:grid;grid-template-columns:1.12fr .88fr;gap:75px;align-items:center}
.hud-layout figure{margin:0}
.hud-layout figure img{width:100%;max-height:500px;object-fit:contain}
.hud-layout h2{color:#fff}
.hud-layout > div > p:not(.section-label){color:#b5bdc5}
.hud-layout .section-label{color:#e2b35e}
.hud-layout .section-index{color:#e2b35e}
.hud-layout ul{margin:28px 0 0;padding:0;list-style:none;border-top:1px solid #46505d}
.hud-layout li{padding:11px 0;border-bottom:1px solid #46505d;color:#d0d5da;font-size:12px}

.shortcut-section{background:var(--warm)}
.shortcut-grid{display:grid;grid-template-columns:repeat(3,1fr);margin-top:50px;border-top:1px solid #d6cdbf;border-left:1px solid #d6cdbf}
.shortcut-grid article{min-height:220px;padding:25px;background:#fff;border-right:1px solid #d6cdbf;border-bottom:1px solid #d6cdbf}
.shortcut-grid span{color:var(--amber2);font-size:9px;font-weight:900}
.shortcut-grid h3{margin:45px 0 8px;font-size:19px}
.shortcut-grid p{margin:0;color:var(--muted);font-size:12px}

.update-section{background:#fff}
.update-layout{display:grid;grid-template-columns:.72fr 1.28fr;gap:75px;align-items:start}
.update-cards{display:grid;grid-template-columns:1fr 1fr;gap:30px}
.update-cards article{min-height:350px;padding:28px;border-top:4px solid var(--amber);border-bottom:1px solid var(--line);background:var(--soft)}
.update-cards article:last-child{border-top-color:var(--red)}
.update-cards > article > span{color:var(--amber2);font-size:9px;font-weight:900;letter-spacing:.12em}
.update-cards h3{margin:45px 0 10px;font-size:25px}
.update-cards ol{margin:24px 0 0;padding-left:20px}
.update-cards li{padding:8px 0;border-bottom:1px solid var(--line);font-size:12px;font-weight:800}

.help-section{background:var(--soft)}
.help-head{max-width:980px}
.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(--warm)}
.help-grid span{color:var(--amber2);font-size:8px;font-weight:900;letter-spacing:.11em}
.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(--amber2);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(--warm)}
.related-links{display:grid;grid-template-columns:repeat(3,1fr);margin-top:50px;border-top:1px solid #d6cdbf;border-left:1px solid #d6cdbf}
.related-links a{min-height:140px;display:grid;align-content:center;padding:23px;background:#fff;border-right:1px solid #d6cdbf;border-bottom:1px solid #d6cdbf}
.related-links a:hover,.related-links a:focus-visible{background:var(--soft)}
.related-links strong{color:var(--amber2);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 245px;gap:42px;align-items:center;padding:44px 0;border-top:5px solid var(--amber);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:#e2b35e;font-size:8px;font-weight:900}
.final-copy p{margin:0 0 9px;color:var(--amber2);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:#b8bec6;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:#747d87;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:#535d68;border-top:1px solid #3a4552;font-size:11px}
.desktop-mobile-sticky{display:none}

@media(max-width:1080px){
  .header-shell{grid-template-columns:235px 1fr 115px}
  .site-nav{gap:16px}
  .hero-grid{grid-template-columns:62px .9fr 1.1fr;gap:35px}
  .install-track{grid-template-columns:repeat(3,1fr)}
}
@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:#fff;border:1px solid var(--line);box-shadow:0 22px 55px rgba(0,0,0,.18)}
  .site-nav.is-open{display:grid}
  .site-nav a{padding:10px 12px}
  .hero{background:#fff}
  .hero-grid{grid-template-columns:58px 1fr}
  .hero-visual{grid-column:1/-1;width:min(100%,760px);margin-inline:auto}
  .hero-answer{grid-template-columns:100px 1fr}
  .hero-answer p{grid-column:2}
  .precheck-layout,.screen-layout,.hud-layout,.update-layout{grid-template-columns:1fr}
  .workspace-gallery{grid-template-columns:1fr;grid-template-rows:auto}
  .workspace-main{grid-row:auto}
  .workspace-gallery > figure:not(.workspace-main){grid-template-columns:1fr 170px}
  .update-cards{max-width:760px}
  .help-grid{grid-template-columns:repeat(2,1fr)}
  .final-shell{grid-template-columns:100px 1fr}
  .final-button{grid-column:2;width:245px}
  .footer-shell{grid-template-columns:1fr}
  .copyright{grid-column:auto}
}
@media(max-width:600px){
  body{padding-bottom:70px}
  .header-shell,.hero-grid,.hero-answer,.section,.final-shell,.footer-shell{width:min(calc(100% - 28px),var(--shell))}
  .brand-caption{display:none}
  .brand-panel img{height:27px}
  .hero-grid{min-height:0;grid-template-columns:1fr;padding:55px 0 48px}
  .hero-index{min-height:45px;flex-direction:row;border-right:0;border-bottom:1px solid var(--line)}
  .hero-index span{font-size:36px}
  .hero h1{font-size:clamp(45px,13.7vw,64px)}
  .hero-lead{font-size:16px}
  .hero-actions{display:grid}
  .primary-button{min-width:0;width:100%}
  .secondary-link{justify-self:start}
  .hero-meta{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,.precheck-copy h2,.workspace-intro h2,.screen-copy h2,.hud-layout h2,.update-layout h2,.help-head h2{font-size:clamp(30px,10vw,41px)}
  .desktop-entry,.install-track,.shortcut-grid,.update-cards,.help-grid,.related-links{grid-template-columns:1fr}
  .desktop-entry > a{min-height:72px}
  .install-track li{min-height:0}
  .install-track h3{margin-top:28px}
  .workspace-gallery > figure:not(.workspace-main){grid-template-columns:1fr}
  .workspace-main img{min-height:0}
  .shortcut-grid article{min-height:0}
  .update-cards 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}
  .desktop-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(23,32,43,.97);border-top:1px solid #414d5c}
  .desktop-mobile-sticky>div{display:flex;align-items:center;gap:10px}
  .desktop-mobile-sticky img{width:75px;height:auto;object-fit:contain}
  .desktop-mobile-sticky small,.desktop-mobile-sticky strong{display:block;line-height:1.2}
  .desktop-mobile-sticky small{color:#788594;font-size:9px}
  .desktop-mobile-sticky strong{margin-top:3px;font-size:13px}
  .desktop-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}
}