*{margin:0;padding:0;box-sizing:border-box}
body{font-family:"Segoe UI","PingFang SC","Microsoft YaHei",sans-serif;color:#1a1a1a;line-height:1.75;background:#fff}
a{text-decoration:none;color:inherit}
.container{max-width:1240px;margin:0 auto;padding:0 28px}
/* 时间条 */
.time-bar{background:#000;color:#ccc;font-size:12px;padding:6px 0}
.time-bar-inner{max-width:1240px;margin:0 auto;padding:0 28px;display:flex;justify-content:space-between}
.tb-status::before{content:"";display:inline-block;width:7px;height:7px;background:#4cd07f;border-radius:50%;margin-right:8px}
/* 顶部导航 */
.site-header{background:#fff;border-bottom:1px solid #eee;position:sticky;top:0;z-index:100}
.nav-wrap{display:flex;align-items:center;height:68px;gap:36px}
.logo{font-size:24px;font-weight:800;color:#000}
.logo span{color:#E4002B}
.main-nav ul{display:flex;list-style:none;gap:8px}
.main-nav>ul>li{position:relative}
.main-nav a{display:block;padding:10px 14px;font-size:15px;font-weight:500}
.main-nav a:hover{color:#E4002B}
.btn-nav-cta{margin-left:auto;background:#E4002B;color:#fff;padding:11px 26px;font-weight:600}
/* Hero */
.poly-hero{background:linear-gradient(135deg,#0a0a0a 0%,#1a1a1a 60%,#2d0a0a 100%);color:#fff;padding:100px 0 90px}
.poly-hero .eyebrow{font-size:13px;letter-spacing:3px;color:#E4002B;font-weight:700;margin-bottom:18px}
.poly-hero h1{font-size:54px;font-weight:800;line-height:1.2;margin-bottom:20px;max-width:900px}
.poly-hero .sub{font-size:22px;color:#ccc;margin-bottom:16px;font-weight:300}
.poly-hero p{font-size:16px;color:#aaa;max-width:720px;margin-bottom:32px;line-height:1.9}
.hero-btns{display:flex;gap:14px}
.btn-red{background:#E4002B;color:#fff;padding:14px 34px;font-weight:700;display:inline-block}
.btn-outline{border:1.5px solid #fff;color:#fff;padding:13px 32px;display:inline-block}
/* 4特性 */
.poly-feats{padding:70px 0;background:#f7f7f7}
.feat4{display:grid;grid-template-columns:repeat(4,1fr);gap:24px}
.feat{padding:28px 24px;background:#fff;border-top:3px solid #E4002B}
.feat .fi{font-size:32px;margin-bottom:14px}
.feat h3{font-size:17px;margin-bottom:8px;color:#000}
.feat p{font-size:14px;color:#666;line-height:1.85}
/* 技术实力区块(对应HP/NASA) */
.poly-tech{padding:80px 0;background:#000;color:#fff}
.poly-tech .wrap{display:grid;grid-template-columns:1fr 1fr;gap:50px;align-items:center}
.poly-tech h2{font-size:36px;font-weight:800;margin-bottom:18px;line-height:1.25}
.poly-tech p{font-size:16px;color:#bbb;line-height:1.95;margin-bottom:14px}
.poly-tech .tech-art{background:linear-gradient(135deg,#E4002B,#8B0000);padding:60px 40px;text-align:center;border-radius:4px}
.poly-tech .tech-art .big{font-size:72px;margin-bottom:14px}
.poly-tech .tech-art .lbl{font-size:15px;color:#fff;opacity:.9}
/* 新版本发布 */
.poly-new{padding:80px 0}
.poly-new .wrap{display:grid;grid-template-columns:1fr 1fr;gap:50px;align-items:center}
.poly-new .tag{display:inline-block;background:#E4002B;color:#fff;font-size:12px;padding:4px 14px;font-weight:700;letter-spacing:1px;margin-bottom:16px}
.poly-new h2{font-size:34px;font-weight:800;margin-bottom:16px;line-height:1.25}
.poly-new p{font-size:16px;color:#555;line-height:1.9;margin-bottom:14px}
.poly-new .new-art{background:#f7f7f7;padding:50px 40px;text-align:center;border:1px solid #eee}
.poly-new .new-art .ver{font-size:48px;font-weight:800;color:#E4002B}
.poly-new .new-art .vl{font-size:14px;color:#888;margin-top:8px}
/* 产品分类探索 */
.poly-explore{padding:70px 0;background:#f7f7f7}
.poly-explore h2{font-size:30px;font-weight:800;margin-bottom:12px}
.poly-explore .lead{font-size:16px;color:#666;margin-bottom:36px}
.exp4{display:grid;grid-template-columns:repeat(4,1fr);gap:20px}
.exp{background:#fff;padding:32px 24px;border:1px solid #eee;transition:.2s}
.exp:hover{border-color:#E4002B;box-shadow:0 8px 24px rgba(228,0,43,.1)}
.exp .ei{font-size:30px;margin-bottom:14px}
.exp h3{font-size:18px;margin-bottom:8px}
.exp p{font-size:14px;color:#666;line-height:1.8;margin-bottom:12px}
.exp a{color:#E4002B;font-weight:600;font-size:14px}
/* 精选场景卡 */
.poly-picks{padding:80px 0}
.poly-picks h2{font-size:30px;font-weight:800;margin-bottom:12px}
.poly-picks .lead{font-size:16px;color:#666;margin-bottom:36px}
.pick4{display:grid;grid-template-columns:repeat(4,1fr);gap:20px}
.pick{border:1px solid #eee;overflow:hidden}
.pick .ph{background:linear-gradient(135deg,#1a1a1a,#333);height:140px;display:flex;align-items:center;justify-content:center;font-size:44px;color:#E4002B}
.pick .pb{padding:22px 20px}
.pick h3{font-size:17px;margin-bottom:8px}
.pick p{font-size:13.5px;color:#666;line-height:1.8}
/* 个人方案区 */
.poly-smb{padding:70px 0;background:linear-gradient(135deg,#E4002B,#8B0000);color:#fff;text-align:center}
.poly-smb h2{font-size:32px;font-weight:800;margin-bottom:14px}
.poly-smb p{font-size:16px;color:#ffe0e0;max-width:680px;margin:0 auto 28px;line-height:1.9}
.poly-smb .btn-white{background:#fff;color:#E4002B;padding:14px 36px;font-weight:700;display:inline-block}
/* Resources */
.poly-res{padding:80px 0}
.poly-res h2{font-size:30px;font-weight:800;margin-bottom:12px}
.poly-res .lead{font-size:16px;color:#666;margin-bottom:36px}
.res5{display:grid;grid-template-columns:repeat(3,1fr);gap:20px}
.res{border:1px solid #eee;padding:26px 22px}
.res .rt{font-size:12px;color:#E4002B;font-weight:700;letter-spacing:1px;margin-bottom:10px}
.res h3{font-size:17px;margin-bottom:8px;line-height:1.4}
.res p{font-size:13.5px;color:#666;line-height:1.8}
/* Spaces */
.poly-spaces{padding:70px 0;background:#f7f7f7}
.poly-spaces .wrap{display:grid;grid-template-columns:1.2fr 1fr;gap:40px;align-items:center}
.poly-spaces h2{font-size:30px;font-weight:800;margin-bottom:14px}
.poly-spaces p{font-size:16px;color:#555;line-height:1.9;margin-bottom:14px}
.poly-spaces .sp-box{background:#fff;padding:36px;border-left:4px solid #E4002B}
.poly-spaces .sp-box h3{font-size:18px;margin-bottom:10px}
/* FAQ */
.poly-faq{padding:70px 0}
.poly-faq h2{font-size:30px;font-weight:800;margin-bottom:30px}
.faq-item{border:1px solid #eee;margin-bottom:12px;padding:0 24px;background:#fff}
.faq-item summary{padding:18px 0;font-size:16px;font-weight:600;cursor:pointer;list-style:none;display:flex;justify-content:space-between}
.faq-item summary::after{content:"+";color:#E4002B;font-size:22px;font-weight:700}
.faq-item[open] summary::after{content:"−"}
.faq-item p{padding:0 0 18px;font-size:14.5px;color:#555;line-height:1.9}
/* Related links */
.poly-related{padding:50px 0;background:#f7f7f7;border-top:1px solid #eee}
.poly-related h4{font-size:14px;color:#888;margin-bottom:18px;letter-spacing:1px}
.rel-links{display:flex;flex-wrap:wrap;gap:10px}
.rel-links a{font-size:13px;color:#555;background:#fff;padding:8px 16px;border:1px solid #ddd}
.rel-links a:hover{color:#E4002B;border-color:#E4002B}
/* Footer */
.site-footer{background:#000;color:#999;padding:56px 0 0}
.footer-grid{display:grid;grid-template-columns:2fr 1fr 1fr 1.2fr;gap:40px;padding-bottom:40px}
.footer-logo{font-size:22px;font-weight:800;color:#fff;margin-bottom:14px}
.footer-logo span{color:#E4002B}
.footer-brand p{font-size:13px;line-height:1.8}
.footer-col h4{color:#fff;font-size:15px;margin-bottom:16px}
.footer-links{display:flex;flex-direction:column;gap:8px}
.footer-links a{font-size:13px;color:#999}.footer-links a:hover{color:#fff}
.footer-col p{font-size:13px;margin-bottom:8px}
.footer-bottom{border-top:1px solid rgba(255,255,255,.12);padding:20px 0;display:flex;justify-content:space-between;font-size:12px}
/* 内页 */
.page-hero{background:linear-gradient(135deg,#0a0a0a,#1a1a1a);color:#fff;padding:60px 0}
.page-hero h1{font-size:38px;margin-bottom:10px}
.page-hero p{color:#aaa;font-size:16px}
.content-section{padding:56px 0}
.content-block{margin-bottom:36px}
.content-block h2{font-size:24px;margin-bottom:14px;padding-left:14px;border-left:4px solid #E4002B}
.content-block h3{font-size:18px;margin:18px 0 8px}
.content-block p{font-size:15px;color:#555;margin-bottom:12px;line-height:1.95}
.price-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:24px}
.price-card{border:1px solid #e0e0e0;padding:34px 26px;text-align:center;background:#fff}
.price-card.featured{border:2px solid #E4002B}
.price-card h3{font-size:20px}
.price-card .price{font-size:42px;font-weight:800;color:#E4002B;margin:14px 0}
.price-card .price small{font-size:14px;color:#777;font-weight:400}
.price-card ul{list-style:none;text-align:left;margin:22px 0}
.price-card li{padding:8px 0;font-size:14px;color:#555;border-bottom:1px solid #f5f5f5}
.price-card li::before{content:"✓ ";color:#E4002B;font-weight:700}
.dl-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:22px}
.dl-card{display:flex;gap:18px;align-items:center;padding:26px;border:1px solid #e0e0e0}
.dl-card .dl-icon{width:58px;height:58px;background:#f7f7f7;display:flex;align-items:center;justify-content:center;font-size:24px;flex-shrink:0}
.dl-card h3{font-size:18px}
.dl-card p{font-size:13px;color:#777;margin:4px 0}
.dl-card a{color:#E4002B;font-weight:600}
@media(max-width:900px){.feat4,.exp4,.pick4,.res5,.price-grid,.dl-grid,.footer-grid{grid-template-columns:1fr}.poly-tech .wrap,.poly-new .wrap,.poly-spaces .wrap{grid-template-columns:1fr}.poly-hero h1{font-size:34px}.main-nav{display:none}}