:root{--blue:#3f8fe5;--blue-dark:#245f9e;--ink:#16283c;--text:#43566a;--muted:#718296;--line:#dce7f2;--soft:#f5f8fc;--soft2:#edf4fb;--shadow:0 16px 42px rgba(42,93,145,.10);--footer:#163f69;--radius:24px;--max:1180px}
*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;font-family:Arial,"Microsoft YaHei",sans-serif;color:var(--text);background:#fff;line-height:1.72;overflow-x:hidden}a{color:inherit;text-decoration:none}img{max-width:100%;height:auto;display:block}button{font:inherit}.sr-only{position:absolute;width:1px;height:1px;overflow:hidden;clip:rect(0,0,0,0)}.skip-link{position:fixed;left:12px;top:-60px;background:#fff;padding:10px 16px;z-index:9999;border:1px solid var(--line)}.skip-link:focus{top:12px}.security-strip{background:#eef6ff;color:#295f93;text-align:center;font-size:13px;padding:7px 18px;border-bottom:1px solid #d9eafb}.site-header{position:sticky;top:0;z-index:900;background:rgba(255,255,255,.94);backdrop-filter:blur(10px);border-bottom:1px solid var(--line)}.header-inner{height:72px;max-width:var(--max);margin:auto;padding:0 24px;display:flex;align-items:center;gap:26px}.brand{display:inline-flex;align-items:center;flex:none}.brand img{width:142px;max-height:42px;object-fit:contain}.desktop-nav{display:flex;align-items:stretch;gap:4px;flex:1;height:100%}.nav-item{position:relative;display:flex;align-items:center}.nav-trigger,.nav-direct{height:100%;padding:0 16px;border:0;background:transparent;color:#294159;cursor:pointer;display:flex;align-items:center;position:relative}.nav-trigger:focus-visible,.nav-direct:focus-visible,.download-btn:focus-visible,.menu-toggle:focus-visible,.menu-close:focus-visible,.mobile-group-title:focus-visible,.faq-question:focus-visible,[role="tab"]:focus-visible{outline:3px solid rgba(63,143,229,.32);outline-offset:2px}.nav-item.is-active .nav-trigger:after,.nav-direct.is-active:after{content:"";position:absolute;height:3px;background:var(--blue);left:16px;right:16px;bottom:0;border-radius:3px}.mega-menu{position:fixed;left:50%;transform:translateX(-50%);top:104px;width:min(980px,calc(100vw - 48px));background:#fff;border:1px solid var(--line);box-shadow:var(--shadow);border-radius:0 0 22px 22px;padding:30px;display:grid;grid-template-columns:1fr 1.45fr;gap:34px}.mega-menu[hidden]{display:none}.mega-intro{padding:8px 16px 8px 4px}.eyebrow{font-size:13px;color:var(--blue-dark);font-weight:700;letter-spacing:.08em}.mega-intro p{margin:10px 0 14px}.text-link{color:var(--blue-dark);font-weight:700}.mega-links{display:grid;grid-template-columns:1fr 1fr;gap:12px}.mega-links a{padding:14px 16px;background:var(--soft);border:1px solid transparent;border-radius:14px}.mega-links a:hover{border-color:#bfd9f6;background:#fff}.header-actions{display:flex;align-items:center;gap:10px}.download-btn{min-height:44px;padding:10px 18px;border-radius:10px;background:var(--blue);color:#fff;font-weight:700;display:inline-flex;align-items:center;justify-content:center;touch-action:manipulation;position:relative;z-index:1}.download-btn:hover{background:#2d7fd2}.menu-toggle{display:none;width:44px;height:44px;border:1px solid var(--line);background:#fff;border-radius:10px;padding:10px;cursor:pointer}.menu-toggle span:not(.sr-only){display:block;height:2px;background:#27425c;margin:4px 0}.mobile-menu{position:fixed;inset:0;z-index:1200;background:#fff;overflow:auto;padding:18px 20px 28px;opacity:0;transform:translateY(-10px);transition:.18s ease}.mobile-menu.is-open{opacity:1;transform:none}.mobile-menu[hidden]{display:none}.mobile-menu-top{display:flex;justify-content:space-between;align-items:center}.menu-close{width:44px;height:44px;border:1px solid var(--line);border-radius:10px;background:#fff;font-size:28px;cursor:pointer}.mobile-groups{margin-top:20px;border-top:1px solid var(--line)}.mobile-group{border-bottom:1px solid var(--line)}.mobile-group-title{width:100%;min-height:52px;border:0;background:#fff;display:flex;align-items:center;justify-content:space-between;padding:10px 2px;font-weight:700;color:var(--ink);cursor:pointer}.mobile-group-links{padding:0 0 16px 14px}.mobile-group-links[hidden]{display:none}.mobile-group-links a{display:block;padding:10px 0;color:var(--text)}.mobile-menu-foot{display:grid;gap:12px;margin-top:24px;padding-top:20px}.menu-open{overflow:hidden}
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.page-hero{padding:62px 0 48px}.breadcrumb{font-size:13px;color:var(--muted);margin-bottom:18px}.breadcrumb a{color:var(--blue-dark)}.page-hero h1{font-size:clamp(38px,5vw,62px);line-height:1.08;color:var(--ink);margin:0 0 16px}.page-summary{max-width:760px;font-size:18px}.page-hero.visual{background:var(--soft)}.page-hero-split{display:grid;grid-template-columns:1.2fr .8fr;gap:50px;align-items:center}.page-hero-split img{max-height:320px;justify-self:center}.article-shell{max-width:var(--max);margin:auto;padding:0 24px 84px;display:grid;grid-template-columns:minmax(0,1fr) 260px;gap:54px}.article-body{min-width:0}.article-body h2{font-size:30px;color:var(--ink);margin:64px 0 16px;scroll-margin-top:110px}.article-body h2:first-child{margin-top:10px}.article-body h3{color:var(--ink);margin-top:28px}.article-body p{margin:0 0 16px}.article-body ul,.article-body ol{padding-left:22px}.note{background:#eef6ff;border-left:4px solid var(--blue);padding:20px 22px;border-radius:0 12px 12px 0;margin:30px 0}.risk-note{background:#f8fafc;border:1px solid var(--line);padding:22px;border-radius:16px;margin:34px 0}.related{margin-top:44px;padding-top:26px;border-top:1px solid var(--line)}.related-links{display:grid;grid-template-columns:repeat(2,1fr);gap:12px}.related-links a{padding:14px 16px;border:1px solid var(--line);border-radius:12px;background:#fff}.article-toc{position:sticky;top:126px;align-self:start;border-left:1px solid var(--line);padding-left:20px}.article-toc h2{font-size:14px;margin:0 0 14px;color:var(--ink)}.toc-links{display:grid;gap:8px}.toc-links a{font-size:13px;color:var(--muted);padding-left:8px;border-left:2px solid transparent}.toc-links a.active{color:var(--blue-dark);border-color:var(--blue)}.toc-toggle{display:none}.overview-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:18px}.overview-block{padding:28px;border:1px solid var(--line);border-radius:20px}.overview-block h2{font-size:24px!important;margin:0 0 12px!important}.term-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:16px}.term{padding:20px;border:1px solid var(--line);border-radius:14px}.term h3{margin:0 0 6px}.news-filter{display:flex;gap:8px;flex-wrap:wrap;margin:20px 0 30px}.news-filter a{padding:7px 10px;background:var(--soft);border-radius:8px;font-size:13px}.support-steps{counter-reset:s}.support-step{padding:24px;border-top:1px solid var(--line)}.support-step:before{counter-increment:s;content:"0" counter(s);color:var(--blue);font-weight:700}.site-footer{background:var(--footer);color:#dcecff;padding:58px 0 0}.footer-grid{max-width:var(--max);margin:auto;padding:0 24px 44px;display:grid;grid-template-columns:1.4fr repeat(3,1fr);gap:44px}.brand-footer img{filter:brightness(0) invert(1)}.footer-grid h2{font-size:15px;color:#fff;margin:0 0 14px}.footer-grid a:not(.brand){display:block;color:#dcecff;padding:5px 0;font-size:14px}.footer-grid p{font-size:14px}.footer-risk{color:#b9d3eb}.footer-bottom{max-width:var(--max);margin:auto;padding:18px 24px;border-top:1px solid rgba(255,255,255,.15);display:flex;gap:18px;justify-content:space-between;font-size:12px;color:#c8dff3}
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