:root{--primary:rgb(213,5,5);--primary-dark:rgb(180,4,4);--text:#1f1f1f;--muted:#666;--light:#f6f6f6;--line:#eee;--white:#fff;--shadow:0 12px 34px rgba(0,0,0,.08);--radius:18px}*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Hiragino Sans GB","Microsoft YaHei",Arial,sans-serif;color:var(--text);background:#fff;line-height:1.72}a{color:inherit;text-decoration:none}img{max-width:100%;display:block}.container{width:min(1180px,calc(100% - 32px));margin:0 auto}.section{padding:54px 0}.section-light{background:var(--light)}.section-title{margin:0 0 12px;font-size:28px;line-height:1.25;letter-spacing:-.5px}.section-lead{margin:0 0 28px;color:var(--muted);max-width:780px}.site-header{position:relative;z-index:20;background:#fff;border-bottom:1px solid var(--line)}.desktop-top{display:none;background:var(--primary-dark);color:#fff;font-size:13px}.top-line{height:36px;display:flex;align-items:center;justify-content:space-between;gap:20px}.header-shell{background:#fff}.mobile-header{height:62px;display:grid;grid-template-columns:64px 1fr 76px;align-items:center;gap:8px;padding:0 14px;background:#fff;border-bottom:3px solid var(--primary-dark)}.menu-button{width:44px;height:44px;border:0;background:transparent;padding:10px;display:flex;flex-direction:column;justify-content:center;gap:5px;cursor:pointer}.menu-button span{display:block;height:2px;background:#1f1f1f;border-radius:999px}.mobile-logo{justify-self:center}.mobile-logo img{height:34px;width:auto;object-fit:contain}.brand-logo img{height:48px;width:auto;object-fit:contain}.top-action{display:inline-flex;align-items:center;justify-content:center;min-height:38px;padding:0 16px;border-radius:999px;background:var(--primary);color:#fff;font-weight:700;white-space:nowrap;box-shadow:0 8px 18px rgba(213,5,5,.22)}.top-action:hover,.main-btn:hover{background:var(--primary-dark)}.desktop-header{display:none}.desktop-nav a{font-size:15px;color:#333;padding:12px 8px;position:relative}.desktop-nav a.active,.desktop-nav a:hover{color:var(--primary);font-weight:700}.desktop-nav a.active:after{content:"";position:absolute;left:8px;right:8px;bottom:4px;height:3px;border-radius:99px;background:var(--primary)}.search-icon{width:22px;height:22px;border:2px solid #333;border-radius:50%;display:inline-block;position:relative;flex:0 0 auto}.search-icon:after{content:"";position:absolute;width:8px;height:2px;background:#333;right:-6px;bottom:1px;transform:rotate(45deg);border-radius:2px}.mobile-nav{display:none;background:#fff;border-bottom:1px solid var(--line);padding:10px 16px 14px;box-shadow:0 14px 24px rgba(0,0,0,.06)}.mobile-nav.open{display:grid;grid-template-columns:1fr 1fr;gap:10px}.mobile-nav a{display:block;padding:10px 12px;border:1px solid var(--line);border-radius:12px;background:#fafafa;font-size:14px;text-align:center}.mobile-nav a.active{border-color:rgba(213,5,5,.35);color:var(--primary);background:#fff5f5;font-weight:700}.main-btn{display:inline-flex;align-items:center;justify-content:center;min-height:46px;padding:0 28px;border-radius:999px;background:var(--primary);color:#fff;font-weight:800;box-shadow:0 12px 22px rgba(213,5,5,.22)}.ghost-btn,.text-link{display:inline-flex;align-items:center;gap:6px;color:var(--primary);font-weight:700}.text-link:after{content:"›";font-size:20px;line-height:1}.official-hero{background:linear-gradient(180deg,#fff 0%,#fff 40%,#f7f7f7 100%);padding:42px 0 48px}.hero-grid{display:grid;gap:30px;align-items:center}.hero-kicker{color:var(--primary);font-weight:800;margin:0 0 10px}.hero-title{font-size:34px;line-height:1.18;margin:0 0 18px;letter-spacing:-.8px}.hero-desc{color:#4a4a4a;margin:0 0 24px;font-size:16px}.hero-tags{display:flex;flex-wrap:wrap;gap:10px;margin-top:22px}.hero-tags span{background:#fff;border:1px solid #f0d6d6;color:#8c2020;border-radius:999px;padding:7px 12px;font-size:13px}.hero-visual{position:relative;background:#fff;border-radius:28px;padding:14px;box-shadow:var(--shadow);overflow:hidden}.hero-visual:before{content:"";position:absolute;inset:0;background:radial-gradient(circle at 20% 20%,rgba(213,5,5,.13),transparent 34%)}.hero-visual img{border-radius:22px;position:relative;width:100%;height:auto}.category-nav-section{background:#fff}.main-category-grid,.sub-category-grid{display:grid;gap:16px}.main-category-grid{grid-template-columns:1fr;margin-bottom:16px}.sub-category-grid{grid-template-columns:1fr}.category-main-card,.category-sub-card,.focus-card,.mini-card,.security-card,.faq-item,.data-card,.content-card{background:#fff;border:1px solid var(--line);border-radius:var(--radius);box-shadow:0 8px 24px rgba(0,0,0,.04)}.category-main-card{padding:24px;min-height:240px;display:flex;flex-direction:column;justify-content:space-between;border-top:4px solid var(--primary)}.category-main-card h3,.category-sub-card h3,.focus-card h3{margin:0 0 10px;font-size:21px}.category-main-card p,.category-sub-card p,.focus-card p,.mini-card p,.security-card p,.data-card p,.content-card p{margin:0 0 18px;color:var(--muted)}.card-label,.red-label{display:inline-flex;align-self:flex-start;margin-bottom:12px;padding:4px 10px;border-radius:999px;background:#fff2f2;color:var(--primary);font-size:12px;font-weight:800}.focus-grid{display:grid;gap:16px}.focus-card{padding:22px;position:relative;overflow:hidden}.focus-card:before{content:"";position:absolute;top:0;left:0;width:5px;height:100%;background:var(--primary)}.info-split{display:grid;gap:20px}.info-panel{background:#fff;border-radius:24px;border:1px solid var(--line);box-shadow:var(--shadow);padding:22px}.info-panel h3{margin:0 0 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