:root{
  --ink:#12202b;--blue:#42647d;--red:#dc2530;--ice:#eef3f7;--paper:#fff;--line:#d7e0e6;--muted:#62717d;--shell:1400px
}
*{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-ledger,.proof-section,.steps-section,.desktop-shell,.details-shell,.faq-section,.footer-main,.footer-bottom{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:250px 1fr 150px;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:26px;font-size:12px;font-weight:800;color:#61727e}.top-download{background:var(--red);color:#fff;padding:10px 14px;text-align:center;font-size:12px;font-weight:900}.menu-button{display:none}
.eyebrow{font-size:10px;font-weight:900;letter-spacing:.15em;color:var(--blue);margin:0 0 12px}
.hero{min-height:640px;display:grid;grid-template-columns:.88fr 1.12fr;gap:70px;align-items:center;padding:72px 0}
.hero h1{margin:0;font-size:clamp(55px,7vw,100px);line-height:.93;letter-spacing:-.07em}.hero-lead{margin:28px 0 0;color:var(--muted);font-size:18px}
.hero-actions{display:flex;align-items:center;gap:20px;margin-top:30px}.primary{display:inline-flex;background:var(--red);color:#fff;padding:15px 20px;font-weight:900}.secondary{border-bottom:1px solid currentColor;font-size:13px;font-weight:850}
.hero-meta{display:grid;grid-template-columns:repeat(3,1fr);margin-top:34px;border-top:1px solid var(--line);border-left:1px solid var(--line)}.hero-meta div{padding:14px;border-right:1px solid var(--line);border-bottom:1px solid var(--line)}.hero-meta small{display:block;color:#8b98a1;font-size:8px;font-weight:900}.hero-meta strong{font-size:11px}
.hero-visual{margin:0}.hero-visual img{width:100%;max-height:520px;object-fit:contain;background:var(--ice)}figcaption{margin-top:8px;color:var(--muted);font-size:10px}
.download-ledger{padding:80px 0}.ledger-title{display:grid;grid-template-columns:140px 1fr;gap:20px;align-items:end;margin-bottom:26px}.ledger-title span{color:var(--blue);font-size:9px;font-weight:900}.ledger-title h2,.section-heading h2,.steps-heading h2,.desktop-copy h2,.details-copy h2{margin:0;font-size:clamp(34px,4vw,52px);line-height:1.15;letter-spacing:-.045em}
.ledger-row{display:grid;grid-template-columns:80px 250px 1fr;gap:20px;padding:18px 0;border-top:1px solid var(--line)}.ledger-row b{color:var(--blue)}.ledger-row p{margin:0;color:var(--muted)}.ledger-download{display:inline-flex;margin-top:26px;background:var(--ink);color:#fff;padding:14px 18px;font-weight:900}
.proof-section{padding:90px 0}.section-heading{max-width:920px}.section-heading>p:not(.eyebrow),.steps-heading>p:not(.eyebrow){color:var(--muted)}
.proof-grid{display:grid;grid-template-columns:1.3fr .7fr;grid-template-rows:1fr 1fr;gap:20px;margin-top:38px}.proof-grid figure{margin:0;border-top:3px solid var(--blue)}.proof-main{grid-row:1/3}.proof-grid img{width:100%;height:100%;object-fit:contain;background:var(--ice)}.proof-grid figcaption{display:grid}.proof-grid figcaption span{color:var(--muted)}
.steps-section{padding:90px 0}.steps-heading{max-width:900px}.step-columns{display:grid;grid-template-columns:repeat(3,1fr);margin-top:36px;border-top:2px solid var(--ink);border-left:1px solid var(--line)}.step-columns article{min-height:205px;padding:20px;border-right:1px solid var(--line);border-bottom:1px solid var(--line)}.step-columns span{font-size:26px;font-weight:950;color:var(--blue)}.step-columns h3{margin:42px 0 6px}.step-columns p{margin:0;color:var(--muted);font-size:11px}.steps-download,.faq-download,.inline-download{display:inline-flex;margin-top:26px;background:var(--red);color:#fff;padding:14px 18px;font-weight:900}
.desktop-section{background:var(--ice)}.desktop-shell{display:grid;grid-template-columns:1.16fr .84fr;gap:65px;align-items:center;padding:95px 0}.desktop-wide{margin:0}.desktop-wide img{width:100%;max-height:500px;object-fit:contain;background:#fff}.desktop-copy p:not(.eyebrow){color:var(--muted)}
.details-section{background:#fff}.details-shell{display:grid;grid-template-columns:.8fr 1.2fr;gap:65px;align-items:center;padding:95px 0}.details-copy p:not(.eyebrow){color:var(--muted)}.details-shell figure{margin:0}.details-shell img{width:100%;max-height:470px;object-fit:contain;background:var(--ice)}
.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)}
.windows-footer{position:relative;overflow:hidden;background:#e4ebef;padding:65px 0 20px}.footer-word{position:absolute;right:-10px;top:-35px;font-size:clamp(110px,20vw,290px);line-height:1;font-weight:950;letter-spacing:-.08em;color:rgba(18,32,43,.055);pointer-events:none}
.footer-main{position:relative;display:grid;grid-template-columns:1fr 420px;gap:60px;align-items:end;min-height:170px}.footer-brand p{max-width:760px;color:#60717d;font-size:11px}.footer-actions{display:grid;grid-template-columns:1fr 1fr;gap:10px}.footer-actions a{padding:13px;border:1px solid rgba(18,32,43,.2);font-size:11px;font-weight:850}.footer-actions a:last-child{grid-column:1/-1;background:var(--ink);color:#fff}
.footer-bottom{position:relative;margin-top:35px;padding-top:15px;border-top:1px solid rgba(18,32,43,.18);display:flex;justify-content:space-between;color:#778690;font-size:9px;font-weight:900;letter-spacing:.11em}
.mobile-download-bar{display:none}
@media(max-width:850px){.header-shell{grid-template-columns:1fr auto}.site-nav,.top-download{display:none}.menu-button{display:block}.site-nav.is-open{display:grid;position:absolute;top:70px;left:18px;right:18px;padding:12px;background:#fff;border:1px solid var(--line)}.hero,.desktop-shell,.details-shell,.footer-main{grid-template-columns:1fr}.proof-grid{grid-template-columns:1fr;grid-template-rows:auto}.proof-main{grid-row:auto}.step-columns{grid-template-columns:1fr 1fr}}
@media(max-width:600px){body{padding-bottom:60px}.header-shell,.hero,.download-ledger,.proof-section,.steps-section,.desktop-shell,.details-shell,.faq-section,.footer-main,.footer-bottom{width:min(calc(100% - 28px),var(--shell))}.brand span{display:none}.hero{min-height:0;padding:52px 0}.hero h1{font-size:clamp(45px,13vw,62px)}.hero-lead{font-size:16px}.hero-actions{display:grid}.hero-meta,.step-columns{grid-template-columns:1fr}.ledger-title,.ledger-row{grid-template-columns:1fr;gap:5px}.desktop-shell,.details-shell{padding:70px 0}.footer-actions{grid-template-columns:1fr}.footer-actions a:last-child{grid-column:auto}.footer-bottom{display:grid;gap:5px}.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}}