:root{--paper:#f7f7f2;--ink:#111214;--line:#c9cbc4;--red:#b91c1c;--mint:#56d7b1;--white:#fff;--rail:min(1160px,calc(100% - 40px))}*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;color:var(--ink);background:var(--paper);font-family:-apple-system,BlinkMacSystemFont,"PingFang SC","Hiragino Sans GB","Microsoft YaHei","微软雅黑",Arial,Helvetica,sans-serif;letter-spacing:0;line-height:1.7}a{color:inherit;text-decoration:none}img{display:block;max-width:100%;height:auto}.rail{width:var(--rail);margin:0 auto}.site-header{height:72px;border-bottom:1px solid var(--line);background:rgba(247,247,242,.98);position:sticky;top:0;z-index:20}.header-inner{height:72px;display:flex;align-items:center;gap:30px}.brand{display:flex;align-items:center;gap:11px;font-weight:800;font-size:20px}.brand img{width:44px;height:44px}.nav{display:flex;gap:26px;margin-left:auto;font-size:14px}.nav a{padding:23px 0 19px;border-bottom:3px solid transparent}.nav a:hover,.nav a.active{border-color:var(--red)}.download{display:inline-flex;align-items:center;justify-content:center;min-height:46px;padding:0 24px;background:var(--red);color:#fff;font-weight:800;border:1px solid var(--red);border-radius:2px}.header-download{min-height:40px;padding:0 18px}.menu-button{display:none;border:1px solid var(--ink);background:transparent;width:42px;height:42px;font-size:22px}.hero{border-bottom:1px solid var(--ink);background:var(--paper)}.hero-grid{display:grid;grid-template-columns:minmax(0,1.05fr) minmax(360px,.75fr);gap:68px;align-items:center;padding:48px 0 34px;min-height:610px}.eyebrow,.section-heading>span,.download-band span,.prose>section>span{font-size:12px;font-weight:800;letter-spacing:0;color:var(--red);text-transform:uppercase}.hero h1{font-size:clamp(42px,5.2vw,72px);line-height:1.08;margin:17px 0 22px;max-width:700px}.hero-copy>p{font-size:17px;max-width:650px;margin:0;color:#414346}.hero-actions{display:flex;align-items:center;gap:22px;margin:30px 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h1{font-size:clamp(38px,5vw,62px);line-height:1.12;margin:12px 0 18px}.inner-hero p{max-width:760px;font-size:17px}.article-section{padding:70px 0}.article-grid{display:grid;grid-template-columns:220px minmax(0,760px);gap:70px;justify-content:center}.toc{position:sticky;top:100px;align-self:start;display:flex;flex-direction:column;border-top:4px solid var(--red)}.toc b,.toc a{padding:12px;border-bottom:1px solid var(--line)}.toc a{font-size:13px}.prose section{scroll-margin-top:100px;margin-bottom:52px}.prose h2{font-size:30px;margin:6px 0 16px}.prose p{font-size:16px;margin:0 0 16px}.prose a{color:var(--red);text-decoration:underline}.faq-section{padding:65px 0}.faq-list{max-width:900px;margin:0 auto;border-top:1px solid var(--ink)}details{border-bottom:1px solid var(--ink)}summary{cursor:pointer;list-style:none;padding:22px 56px 22px 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