:root{
  --ink:#161616;
  --ink-2:#2a2927;
  --red:#df202c;
  --red-dark:#b7141e;
  --sand:#f3eee6;
  --sand-2:#e7ded1;
  --paper:#ffffff;
  --soft:#f6f6f4;
  --line:#dedbd7;
  --muted:#6d6a66;
  --shell:1380px;
  --article:980px;
}

*{box-sizing:border-box}
html{scroll-behavior:smooth;scroll-padding-top:80px}
body{
  margin:0;min-width:320px;background:var(--paper);color:var(--ink);
  font-family:Arial,"Microsoft YaHei","PingFang SC",sans-serif;
  line-height:1.78;-webkit-font-smoothing:antialiased;text-rendering:optimizeLegibility
}
img{display:block;max-width:100%}
a{color:inherit;text-decoration:none}
button{font:inherit}
button,a{-webkit-tap-highlight-color:transparent}
.skip-link{position:fixed;top:-90px;left:16px;z-index:999;padding:10px 14px;background:var(--red);color:#fff;font-weight:800}
.skip-link:focus{top:16px}

.header-shell,.hero-copy,.hero-image,.hero-notes,.second-screen,.section,.related-shell,.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(14px)
}
.header-shell{
  min-height:74px;display:grid;grid-template-columns:255px 1fr 132px;gap:28px;align-items:center
}
.brand{display:flex;align-items:center;gap:11px;width:max-content}
.brand-logo{padding:6px 11px;background:var(--ink);border-left:4px solid var(--red)}
.brand-logo img,.footer-logo img{width:auto;height:28px;object-fit:contain}
.brand-text{font-size:8px;font-weight:900;letter-spacing:.13em;color:#8e8a86}
.site-nav{display:flex;justify-content:center;gap:28px;color:#68645f;font-size:12px;font-weight:800}
.site-nav a{padding:23px 0}
.site-nav a:hover,.site-nav a:focus-visible{color:var(--red)}
.header-download{justify-self:end;padding:10px 14px;background:var(--red);color:#fff;font-size:12px;font-weight:900}
.header-download:hover,.header-download:focus-visible{background:var(--red-dark)}
.menu-button{display:none;width:43px;height:43px;border:1px solid var(--line);background:#fff}
.menu-button span{display:block;width:19px;height:2px;margin:4px auto;background:var(--ink)}

.hero{padding:0 0 42px;background:linear-gradient(180deg,#fff 0 90%,var(--sand) 90% 100%)}
.hero-copy{padding:78px 0 45px;text-align:center}
.eyebrow,.section-kicker{margin:0 0 13px;color:var(--red);font-size:10px;font-weight:900;letter-spacing:.15em;text-transform:uppercase}
.hero h1{margin:0;font-size:clamp(56px,8.2vw,112px);line-height:.93;letter-spacing:-.075em}
.hero-answer{max-width:930px;margin:29px auto 0;color:#57534f;font-size:18px}
.hero-actions{display:flex;justify-content:center;align-items:center;gap:23px;flex-wrap:wrap;margin-top:32px}
.primary-button{min-height:60px;display:flex;align-items:center;justify-content:space-between;gap:20px;padding:14px 20px;background:var(--red);color:#fff;font-weight:900}
.primary-button:hover,.primary-button:focus-visible{background:var(--red-dark)}
.primary-button b{font-size:20px}
.text-link{padding-bottom:3px;border-bottom:1px solid currentColor;font-size:13px;font-weight:850}
.hero-notes{display:flex;justify-content:center;flex-wrap:wrap;gap:8px;margin-top:-2px;margin-bottom:25px}
.hero-notes span{padding:7px 10px;background:#fff;border:1px solid var(--line);font-size:10px;font-weight:800}
.hero-image{margin-top:0}
.hero-image img{width:100%;max-height:500px;object-fit:contain;background:var(--soft)}
.hero-image figcaption,.step-wide-image figcaption,.redownload-image figcaption{
  margin-top:9px;color:var(--muted);font-size:10px
}

.second-screen{padding:82px 0 102px}
.compact-heading{max-width:900px}
.section-heading h2,.article-column>h2,.related-shell>h2,.final-shell h2,.redownload-copy h2{
  margin:0;font-size:clamp(34px,4vw,52px);line-height:1.17;letter-spacing:-.045em
}
.section-heading>p:not(.section-kicker){margin:18px 0 0;color:var(--muted)}
.editorial-gallery{
  display:grid;grid-template-columns:1.28fr .72fr;grid-template-rows:1fr 1fr;
  gap:20px;margin-top:43px
}
.editorial-gallery figure{margin:0;border-top:3px solid var(--ink)}
.editorial-gallery img{width:100%;height:100%;max-height:420px;object-fit:contain;background:var(--soft)}
.gallery-large{grid-row:1/3}
.gallery-large img{min-height:460px}
.editorial-gallery figcaption{display:grid;padding:16px 0 0}
.editorial-gallery figcaption strong{font-size:15px}
.editorial-gallery figcaption span{margin-top:4px;color:var(--muted);font-size:11px}

.section{
  display:grid;grid-template-columns:80px 1fr;gap:34px;
  padding-top:106px;padding-bottom:106px
}
.section-number{font-size:56px;font-weight:950;line-height:1;color:#b89b7a}
.article-column{max-width:var(--article)}
.article-column>.lead-paragraph{margin:20px 0 0;color:#5d5955;font-size:16px}
.download-intro{border-top:1px solid var(--line)}
.download-line{
  display:grid;grid-template-columns:1fr 1fr 250px;
  margin-top:35px;border-top:2px solid var(--ink);border-left:1px solid var(--line)
}
.download-line>div{padding:19px;border-right:1px solid var(--line);border-bottom:1px solid var(--line)}
.download-line span{display:block;color:#98918b;font-size:8px;font-weight:900}
.download-line strong{display:block;margin-top:5px;font-size:12px}
.download-line>a{display:grid;place-items:center;padding:16px;background:var(--ink);color:#fff;font-size:12px;font-weight:900;text-align:center}
.download-line>a:hover{background:var(--red)}
.note-block{margin-top:25px;padding:23px 26px;background:var(--sand);border-left:4px solid var(--red)}
.note-block strong{font-size:14px}
.note-block p{margin:7px 0 0;color:var(--muted);font-size:12px}

.steps-section{background:var(--sand)}
.steps-list{margin:38px 0 0;padding:0;list-style:none;border-top:2px solid var(--ink)}
.steps-list li{display:grid;grid-template-columns:105px 1fr;gap:26px;padding:25px 0;border-bottom:1px solid #d7cdbf}
.step-no{color:var(--red);font-size:9px;font-weight:900;letter-spacing:.12em}
.step-body h3{margin:-5px 0 7px;font-size:19px}
.step-body p{margin:0;color:#625d57}
.inline-download{display:inline-block;margin-top:14px;color:var(--red);border-bottom:1px solid currentColor;font-size:12px;font-weight:900}
.step-wide-image{margin:45px 0 20px}
.step-wide-image img{width:100%;max-height:500px;object-fit:contain;background:#fff}
.steps-list-second{margin-top:30px}

.after-install{background:#fff}
.image-story{
  display:grid;grid-template-columns:1.14fr .86fr;gap:55px;align-items:center;
  margin-top:49px;padding-top:30px;border-top:1px solid var(--line)
}
.image-story.reverse{grid-template-columns:.86fr 1.14fr}
.image-story.reverse .story-image{order:2}
.story-image{margin:0}
.story-image img{width:100%;max-height:480px;object-fit:contain;background:var(--soft)}
.story-copy span{color:var(--red);font-size:8px;font-weight:900;letter-spacing:.12em}
.story-copy h3{margin:7px 0 10px;font-size:26px;line-height:1.3}
.story-copy p{margin:0;color:var(--muted)}

.download-problems{background:var(--soft)}
.problem-lines{margin-top:38px;border-top:2px solid var(--ink)}
.problem-lines article{
  display:grid;grid-template-columns:110px 260px 1fr;gap:22px;
  padding:19px 0;border-bottom:1px solid var(--line);align-items:start
}
.problem-lines span{color:var(--red);font-size:9px;font-weight:900}
.problem-lines h3{margin:-3px 0 0;font-size:16px}
.problem-lines p{margin:0;color:var(--muted);font-size:12px}

.redownload{
  display:grid;grid-template-columns:1.08fr .92fr;gap:70px;align-items:center;
  width:min(calc(100% - 56px),var(--shell));margin-inline:auto;
  padding-top:106px;padding-bottom:106px;background:#fff
}
.redownload-image{margin:0}
.redownload-image img{width:100%;max-height:480px;object-fit:contain;background:var(--soft)}
.redownload-copy>p:not(.section-kicker){margin:18px 0 26px;color:var(--muted)}

.faq-section{background:var(--sand)}
.faq-list{margin-top:38px;border-top:2px solid var(--ink)}
.faq-list details{border-bottom:1px solid #d7cdbf}
.faq-list summary{
  position:relative;padding:22px 50px 22px 0;cursor:pointer;list-style:none;
  font-size:15px;font-weight:850
}
.faq-list summary::-webkit-details-marker{display:none}
.faq-list summary span{
  position:absolute;right:0;top:18px;width:30px;height:30px;display:grid;place-items:center;
  border:1px solid #cfc2b0;border-radius:50%;color:var(--red);transition:transform .2s ease
}
.faq-list details[open] summary span{transform:rotate(45deg)}
.faq-list details p{margin:-2px 0 22px;color:var(--muted)}

.related-downloads{padding:90px 0;background:#fff}
.related-shell>h2{max-width:850px}
.related-links{display:grid;grid-template-columns:repeat(3,1fr);margin-top:38px;border-top:1px solid var(--line);border-left:1px solid var(--line)}
.related-links a{min-height:130px;display:grid;align-content:center;padding:21px;border-right:1px solid var(--line);border-bottom:1px solid var(--line)}
.related-links a:hover{background:var(--soft)}
.related-links strong{color:var(--red);font-size:14px}
.related-links span{margin-top:4px;color:var(--muted);font-size:10px}

.final-cta{background:var(--ink);color:#fff}
.final-shell{min-height:260px;display:grid;grid-template-columns:1fr 280px;gap:50px;align-items:center;padding:48px 0}
.final-shell>div>span{color:#d9b99a;font-size:9px;font-weight:900;letter-spacing:.12em}
.final-shell h2{margin-top:7px;color:#fff}
.final-shell p{margin:12px 0 0;color:#9d9d9d;font-size:11px}
.final-button{min-height:70px;display:grid;place-items:center;padding:16px;background:var(--red);font-weight:900;text-align:center}
.final-button:hover{background:var(--red-dark)}

.site-footer{padding:48px 0 28px;background:#0e0e0e;color:#aaa}
.footer-shell{display:grid;grid-template-columns:1fr auto;gap:30px 50px}
.footer-main p{max-width:820px;margin:15px 0 0;color:#707070;font-size:10px}
.footer-nav{display:grid;grid-template-columns:repeat(2,auto);gap:8px 22px;font-size:11px;font-weight:700}
.footer-nav a:hover{color:#fff}
.copyright{grid-column:1/-1;margin:0;padding-top:19px;border-top:1px solid #333;color:#555;font-size:10px}
.mobile-download-bar{display:none}

@media(max-width:1000px){
  .header-shell{grid-template-columns:225px 1fr 122px}
  .site-nav{gap:15px}
  .problem-lines article{grid-template-columns:90px 220px 1fr}
}
@media(max-width:820px){
  html{scroll-padding-top:72px}
  .header-shell{min-height:68px;grid-template-columns:1fr auto}
  .header-download{display:none}
  .menu-button{display:block}
  .site-nav{
    position:absolute;left:18px;right:18px;top:calc(100% + 7px);
    display:none;padding:10px;background:#fff;border:1px solid var(--line);
    box-shadow:0 22px 50px rgba(0,0,0,.15)
  }
  .site-nav.is-open{display:grid}
  .site-nav a{padding:9px 11px}
  .editorial-gallery{grid-template-columns:1fr;grid-template-rows:auto}
  .gallery-large{grid-row:auto}
  .gallery-large img{min-height:0}
  .image-story,.image-story.reverse{grid-template-columns:1fr;gap:24px}
  .image-story.reverse .story-image{order:0}
  .problem-lines article{grid-template-columns:90px 1fr}
  .problem-lines p{grid-column:2}
  .redownload{grid-template-columns:1fr}
  .final-shell{grid-template-columns:1fr}
  .footer-shell{grid-template-columns:1fr}
  .copyright{grid-column:auto}
}
@media(max-width:600px){
  body{padding-bottom:62px}
  .header-shell,.hero-copy,.hero-image,.hero-notes,.second-screen,.section,.related-shell,.final-shell,.footer-shell,.redownload{
    width:min(calc(100% - 28px),var(--shell))
  }
  .brand-text{display:none}
  .brand-logo img{height:26px}
  .hero-copy{padding:53px 0 35px}
  .hero h1{font-size:clamp(46px,14.4vw,66px)}
  .hero-answer{font-size:16px;text-align:left}
  .hero-actions{display:grid}
  .primary-button{width:100%}
  .text-link{justify-self:center}
  .hero-image img{object-fit:contain}
  .second-screen{padding:68px 0 75px}
  .section{
    grid-template-columns:1fr;gap:10px;
    padding-top:72px;padding-bottom:72px
  }
  .section-number{font-size:40px}
  .section-heading h2,.article-column>h2,.related-shell>h2,.redownload-copy h2,.final-shell h2{font-size:clamp(30px,10vw,40px)}
  .download-line{grid-template-columns:1fr}
  .download-line>a{min-height:62px}
  .steps-list li{grid-template-columns:1fr;gap:5px}
  .step-body h3{margin-top:0}
  .story-copy h3{font-size:22px}
  .problem-lines article{grid-template-columns:1fr;gap:4px}
  .problem-lines p{grid-column:auto}
  .redownload{padding-top:72px;padding-bottom:72px}
  .related-links{grid-template-columns:1fr}
  .final-shell{padding:39px 0}
  .footer-nav{grid-template-columns:1fr 1fr}
  .mobile-download-bar{
    position:fixed;left:0;right:0;bottom:0;z-index:120;height:60px;
    display:flex;align-items:center;justify-content:space-between;gap:12px;
    padding:7px 14px;background:rgba(22,22,22,.98);color:#fff;border-top:1px solid #3b3b3b
  }
  .mobile-download-bar small,.mobile-download-bar strong{display:block;line-height:1.15}
  .mobile-download-bar small{color:#777;font-size:8px}
  .mobile-download-bar strong{margin-top:3px;font-size:12px}
  .mobile-download-bar a{padding:9px 15px;background:var(--red);font-size:12px;font-weight:900}
}
@media(prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  *,*::before,*::after{transition-duration:.01ms!important}
}