:root{
  --ink:#26221c;--brown:#8e7354;--red:#dc2730;--cream:#f6f2eb;--paper:#fff;--line:#ddd4c8;--muted:#726a60;--shell:1380px
}
*{box-sizing:border-box}html{scroll-behavior:smooth;scroll-padding-top:78px}
body{margin:0;min-width:320px;font-family:Arial,"Microsoft YaHei","PingFang SC",sans-serif;color:var(--ink);line-height:1.76;background:#fff}
img{display:block;max-width:100%}a{text-decoration:none;color:inherit}
.header-shell,.hero,.download-section,.image-section,.steps-section,.window-section,.feature-grid,.faq-section,.desktop-footer{width:min(calc(100% - 56px),var(--shell));margin:auto}
.site-header{position:sticky;top:0;z-index:50;background:rgba(255,255,255,.97);border-bottom:1px solid var(--line)}
.header-shell{height:74px;display:grid;grid-template-columns:260px 1fr 140px;gap:25px;align-items:center}.brand{display:flex;align-items:center;gap:10px;font-size:9px;font-weight:900;letter-spacing:.13em}.brand img,.footer-brand img{height:28px;width:auto;background:var(--ink);padding:5px 9px}.site-nav{display:flex;justify-content:center;gap:25px;font-size:12px;font-weight:800;color:#71695f}.top-btn{background:var(--red);color:#fff;padding:10px 14px;text-align:center;font-size:12px;font-weight:900}.menu-button{display:none}
.kicker{font-size:10px;font-weight:900;letter-spacing:.15em;color:var(--brown);margin:0 0 12px}
.hero{position:relative;display:grid;grid-template-columns:.78fr 1.22fr;gap:70px;align-items:end;padding:82px 0 55px}.hero-index{position:absolute;top:26px;left:0;color:#b1a28f;font-size:9px;font-weight:900;letter-spacing:.16em}.hero h1{margin:0;font-size:clamp(54px,6.9vw,96px);line-height:.94;letter-spacing:-.068em}.hero-copy>p:not(.kicker){color:var(--muted);font-size:18px}.hero-actions{display:flex;gap:20px;align-items:center;margin-top:28px}.primary{display:inline-flex;background:var(--red);color:#fff;padding:15px 20px;font-weight:900}.hero-actions>a:last-child{border-bottom:1px solid currentColor;font-size:13px;font-weight:850}.hero-image{margin:0}.hero-image img{width:100%;max-height:520px;object-fit:contain;background:var(--cream)}figcaption{margin-top:8px;color:var(--muted);font-size:10px}
.download-section{padding:95px 0}.download-heading,.steps-head,.faq-head{display:grid;grid-template-columns:90px 1fr;gap:25px}.download-heading>span,.steps-head>span,.faq-head>span{font-size:52px;font-weight:950;color:#c8baa8}.download-heading h2,.image-title h2,.steps-head h2,.window-copy h2,.feature-grid h2,.faq-head h2,.footer-brand h2{margin:0;font-size:clamp(34px,4vw,52px);line-height:1.15;letter-spacing:-.045em}.download-heading p:not(.kicker),.image-title p:not(.kicker),.steps-head p:not(.kicker),.window-copy p:not(.kicker),.feature-grid p:not(.kicker){color:var(--muted)}
.download-table{display:grid;grid-template-columns:repeat(4,1fr);margin-top:35px;border-top:2px solid var(--ink);border-left:1px solid var(--line)}.download-table div{padding:20px;border-right:1px solid var(--line);border-bottom:1px solid var(--line)}.download-table small{display:block;color:var(--brown);font-size:8px;font-weight:900}.download-table strong{display:block;margin:25px 0 5px;font-size:16px}.download-table p{margin:0;color:var(--muted);font-size:11px}.download-main,.steps-btn,.faq-btn{display:inline-flex;margin-top:26px;background:var(--ink);color:#fff;padding:14px 18px;font-weight:900}
.image-section{padding:95px 0}.image-title{max-width:930px}.image-layout{display:grid;grid-template-columns:1.25fr .75fr;grid-template-rows:1fr 1fr;gap:20px;margin-top:38px}.image-layout figure{margin:0}.image-a{grid-row:1/3}.image-layout img{width:100%;height:100%;object-fit:contain;background:var(--cream)}.image-layout figcaption{display:grid}.image-layout figcaption span{color:var(--muted)}
.steps-section{background:var(--cream);width:100%;padding:95px max(28px,calc((100% - var(--shell))/2))}.steps{list-style:none;padding:0;margin:36px 0 0;max-width:1050px;border-top:2px solid var(--ink)}.steps li{display:grid;grid-template-columns:85px 1fr;gap:25px;padding:20px 0;border-bottom:1px solid #d4c9b9}.steps em{font-style:normal;color:var(--brown);font-weight:950}.steps h3{margin:-3px 0 5px}.steps p{margin:0;color:var(--muted)}
.window-section{padding:95px 0;display:grid;grid-template-columns:.85fr 1.15fr;gap:65px;align-items:center}.outline-btn{display:inline-flex;margin-top:22px;border:1px solid var(--ink);padding:13px 17px;font-weight:900}.window-image{margin:0}.window-image img{width:100%;max-height:500px;object-fit:contain;background:var(--cream)}
.feature-section{background:#25221e;color:#fff}.feature-grid{display:grid;grid-template-columns:1.15fr .85fr;gap:65px;align-items:center;padding:95px 0}.feature-grid figure{margin:0}.feature-grid img{width:100%;max-height:470px;object-fit:contain;background:#11100e}.feature-grid p:not(.kicker){color:#b5ada2}
.faq-section{padding:95px 0}.faq-list{margin-top:30px;border-top:2px solid var(--ink)}details{border-bottom:1px solid var(--line)}summary{list-style:none;position:relative;padding:20px 45px 20px 0;font-weight:850;cursor:pointer}summary span{position:absolute;right:0}.faq-list p{margin:-3px 0 20px;color:var(--muted)}
.desktop-footer{display:grid;grid-template-columns:150px 1fr;margin-bottom:0;border-top:1px solid var(--line)}.footer-rail{background:var(--ink);color:#fff;padding:42px 20px}.footer-rail span{display:block;font-size:62px;font-weight:950;line-height:1}.footer-rail small{display:block;margin-top:15px;color:#94897c;font-size:8px;font-weight:900;letter-spacing:.14em}.footer-body{padding:48px 0 28px 55px}.footer-brand{max-width:780px}.footer-brand p{color:var(--muted);font-size:11px}.footer-index{display:grid;grid-template-columns:repeat(4,1fr);margin-top:30px;border-top:1px solid var(--line);border-left:1px solid var(--line)}.footer-index a{display:grid;padding:15px;border-right:1px solid var(--line);border-bottom:1px solid var(--line)}.footer-index b{color:var(--brown);font-size:10px}.footer-index span{margin-top:5px;font-size:11px;font-weight:850}.footer-index a:last-child{background:var(--red);color:#fff}.footer-index a:last-child b{color:#fff}.footer-meta{display:flex;justify-content:space-between;margin-top:22px;color:#9b8f81;font-size:9px;font-weight:900}
.mobile-download-bar{display:none}
@media(max-width:850px){.header-shell{grid-template-columns:1fr auto}.site-nav,.top-btn{display:none}.menu-button{display:block}.site-nav.is-open{display:grid;position:absolute;top:70px;left:18px;right:18px;background:#fff;border:1px solid var(--line);padding:12px}.hero,.window-section,.feature-grid{grid-template-columns:1fr}.image-layout{grid-template-columns:1fr;grid-template-rows:auto}.image-a{grid-row:auto}.download-table{grid-template-columns:1fr 1fr}.desktop-footer{grid-template-columns:110px 1fr}.footer-index{grid-template-columns:1fr 1fr}}
@media(max-width:600px){body{padding-bottom:60px}.header-shell,.hero,.download-section,.image-section,.steps-section,.window-section,.feature-grid,.faq-section,.desktop-footer{width:min(calc(100% - 28px),var(--shell))}.brand span{display:none}.hero{padding:55px 0}.hero h1{font-size:clamp(45px,13vw,62px)}.hero-copy>p:not(.kicker){font-size:16px}.hero-actions{display:grid}.download-heading,.steps-head,.faq-head{grid-template-columns:1fr;gap:5px}.download-heading>span,.steps-head>span,.faq-head>span{font-size:36px}.download-table{grid-template-columns:1fr}.steps-section{padding:70px 14px}.steps li{grid-template-columns:1fr;gap:5px}.window-section,.feature-grid{padding:70px 0}.desktop-footer{grid-template-columns:1fr}.footer-rail{padding:20px}.footer-body{padding:35px 15px 25px}.footer-index{grid-template-columns:1fr}.mobile-download-bar{position:fixed;left:0;right:0;bottom:0;z-index:90;height:60px;background:var(--ink);color:#fff;display:flex;align-items:center;justify-content:space-between;padding:8px 14px}.mobile-download-bar a{background:var(--red);padding:9px 15px;font-weight:900}}