/* t3 - 下载中心：简洁白底+分类图标+下载卡片+热门标签云 */
*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
body{font-family:"PingFang SC","Microsoft YaHei",sans-serif;background:#fff;color:#333;font-size:14px;line-height:1.7}
a{color:#e74c3c;text-decoration:none}a:hover{color:#c0392b}
img{max-width:100%}ul,ol{list-style:none;padding:0;margin:0}
.nt3-container{max-width:1100px;margin:0 auto;padding:0 20px}

.nt3-header{background:#fff;border-bottom:1px solid #f0f0f0;position:sticky;top:0;z-index:100}
.nt3-header .nt3-container{display:flex;align-items:center;justify-content:space-between;height:56px}
.nt3-logo{font-weight:700;font-size:18px;color:#333;display:flex;align-items:center;gap:8px}.nt3-logo img{height:28px}
.nt3-nav{display:flex;gap:4px}.nt3-nav a{padding:6px 12px;border-radius:6px;font-size:14px;color:#666}.nt3-nav a:hover{color:#e74c3c;background:#fff5f5}
.nt3-nav .nt3-drop{position:relative}.nt3-nav .nt3-drop-menu{display:none;position:absolute;top:100%;right:0;background:#fff;border:1px solid #eee;border-radius:8px;min-width:140px;padding:4px 0;box-shadow:0 4px 16px rgba(0,0,0,0.08)}.nt3-nav .nt3-drop:hover .nt3-drop-menu{display:block}.nt3-nav .nt3-drop-menu a{display:block;padding:8px 16px;font-size:13px;color:#666}
.nt3-header .nt3-cta{background:#e74c3c;color:#fff;padding:7px 18px;border-radius:6px;font-size:13px;font-weight:600}.nt3-header .nt3-cta:hover{background:#c0392b;color:#fff}

.nt3-hero{background:linear-gradient(135deg,#fef2f2,#fff5f5,#fef2f2);padding:80px 0 60px;text-align:center}
.nt3-hero .tag{display:inline-block;padding:4px 14px;background:#fff;border:1px solid #fdd;border-radius:20px;color:#e74c3c;font-size:12px;font-weight:600;margin-bottom:16px}
.nt3-hero h1{font-size:42px;font-weight:800;color:#1a1a1a;margin-bottom:12px}.nt3-hero h1 span{color:#e74c3c}
.nt3-hero p{color:#888;font-size:16px;max-width:500px;margin:0 auto 28px}
.nt3-hero .hero-btns{display:flex;gap:12px;justify-content:center}

.nt3-btn{display:inline-block;padding:11px 30px;border-radius:8px;font-size:15px;font-weight:600;cursor:pointer;border:none}.nt3-btn-red{background:#e74c3c;color:#fff}.nt3-btn-red:hover{background:#c0392b;color:#fff}
.nt3-btn-outline{background:#fff;color:#e74c3c;border:1px solid #fdd}.nt3-btn-outline:hover{background:#fff5f5}

.nt3-tags{display:flex;justify-content:center;gap:8px;flex-wrap:wrap;margin-top:40px}
.nt3-tags a{display:block;width:100px;padding:24px 12px;background:#fff;border:1px solid #f0f0f0;border-radius:12px;text-align:center;transition:.2s;color:#666;font-size:12px}
.nt3-tags a:hover{border-color:#e74c3c;box-shadow:0 4px 16px rgba(231,76,60,0.08);color:#e74c3c}
.nt3-tags a .ticon{display:block;font-size:28px;margin-bottom:8px}

.nt3-section{padding:60px 0}.nt3-section h2{font-size:24px;font-weight:700;text-align:center;margin-bottom:8px}.nt3-section .sub{text-align:center;color:#999;margin-bottom:36px}

.nt3-dl-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:20px}
.nt3-dl-card{background:#fff;border:1px solid #f0f0f0;border-radius:14px;padding:32px 24px;text-align:center;transition:.2s}.nt3-dl-card:hover{border-color:#e74c3c;box-shadow:0 6px 24px rgba(231,76,60,0.06)}
.nt3-dl-card .dl-icon{width:64px;height:64px;margin:0 auto 16px;border-radius:16px;overflow:hidden;background:#fff5f5}.nt3-dl-card .dl-icon img{width:100%;height:100%;object-fit:cover}
.nt3-dl-card h4{font-size:17px;font-weight:600;margin-bottom:6px}.nt3-dl-card p{font-size:13px;color:#999;margin-bottom:16px}
.nt3-dl-card .dl-info{font-size:11px;color:#ccc;margin-bottom:12px}

.nt3-news-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:16px}
.nt3-news-card{background:#fff;border:1px solid #f0f0f0;border-radius:10px;overflow:hidden;transition:.2s}.nt3-news-card:hover{box-shadow:0 4px 16px rgba(0,0,0,0.06)}
.nt3-news-card .ni{height:140px;overflow:hidden}.nt3-news-card .ni img{width:100%;height:100%;object-fit:cover}
.nt3-news-card .nt{padding:14px}.nt3-news-card .nt h4{font-size:14px;font-weight:600;margin-bottom:4px}.nt3-news-card .nt .tm{font-size:11px;color:#ccc}

.nt3-partner-wrap{overflow:hidden}.nt3-partner-track{display:flex;gap:20px;animation:nt3p 22s linear infinite;width:fit-content}.nt3-partner-item{flex-shrink:0;padding:12px 22px;border:1px solid #f5f5f5;border-radius:8px}.nt3-partner-item img{height:45px;opacity:0.4;filter:grayscale(1)}.nt3-partner-item:hover img{opacity:1;filter:none}
@keyframes nt3p{0%{transform:translateX(0)}100%{transform:translateX(-50%)}}

.nt3-faq{max-width:800px;margin:0 auto}.nt3-faq .faq-item{border:1px solid #f0f0f0;border-radius:8px;margin-bottom:8px;overflow:hidden}.nt3-faq .faq-item .q{padding:14px 20px;font-weight:600;cursor:pointer;display:flex;justify-content:space-between}.nt3-faq .faq-item .q::after{content:'+'}.nt3-faq .faq-item.open .q::after{content:'−'}.nt3-faq .faq-item .a{padding:0 20px;max-height:0;overflow:hidden;transition:.3s;color:#888}.nt3-faq .faq-item.open .a{padding:0 20px 14px;max-height:240px}

.nt3-footer{background:#1a1a1a;color:#888;padding:40px 0 24px;font-size:13px}.nt3-footer a{color:#888}.nt3-footer a:hover{color:#fff}.nt3-footer .fg{display:grid;grid-template-columns:2fr 1fr;gap:30px;margin-bottom:20px}.nt3-footer .fb{text-align:center;padding-top:20px;border-top:1px solid rgba(255,255,255,0.06)}

.nt3-detail{padding-top:20px}.nt3-row{display:flex;gap:20px;flex-wrap:wrap}.nt3-main{flex:2}.nt3-side{flex:1;min-width:250px}
.nt3-card{border:1px solid #f0f0f0;border-radius:10px;margin-bottom:14px}.nt3-card-hd{padding:14px 18px;border-bottom:1px solid #f0f0f0;font-weight:600}.nt3-card-bd{padding:18px}
.nt3-bread{padding:10px 0;font-size:12px;color:#ccc}.nt3-bread a{color:#999}
.nt3-art-item{display:flex;gap:14px;padding:14px 0;border-bottom:1px solid #f5f5f5}.nt3-art-item .art-t{width:160px;height:110px;border-radius:8px;overflow:hidden;flex-shrink:0}.nt3-art-item .art-t img{width:100%;height:100%;object-fit:cover}.nt3-art-item .art-i h4{font-size:14px;font-weight:600}.nt3-art-item .art-i h4 a{color:#333}.nt3-art-item .art-i .art-d{font-size:12px;color:#ccc;overflow:hidden;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical}
.nt3-list-i{padding:7px 0;border-bottom:1px solid #fafafa}.nt3-list-i a{color:#666;font-size:13px}.nt3-list-i .lt{font-size:11px;color:#ddd}
.nt3-tags{display:flex;gap:5px;flex-wrap:wrap}.nt3-tags a{padding:4px 10px;background:#fff5f5;color:#e74c3c;border-radius:6px;font-size:11px}
.nt3-pag{display:flex;justify-content:center;gap:5px;padding:20px 0}.nt3-pag a,.nt3-pag span{padding:7px 12px;border:1px solid #eee;border-radius:6px;font-size:12px;color:#999}.nt3-pag a:hover{background:#e74c3c;color:#fff}.nt3-pag .active span{background:#e74c3c;color:#fff}
.nt3-dbody{font-size:15px;line-height:1.9;color:#555}.nt3-dbody img{border-radius:8px}.nt3-dbody a{color:#e74c3c}
.nt3-meta{display:flex;gap:12px;font-size:12px;color:#ccc;padding-bottom:10px;border-bottom:1px solid #f0f0f0;margin-bottom:14px}
.nt3-pn{display:flex;gap:12px;padding:12px 0;border-top:1px solid #f0f0f0;margin-top:20px}
.nt3-404{text-align:center;padding:100px 20px}.nt3-404 .code{font-size:120px;color:#f5f5f5}
@media(max-width:768px){.nt3-dl-grid{grid-template-columns:1fr}.nt3-news-grid{grid-template-columns:1fr}}
.nt3-hgrid{display:grid;grid-template-columns:repeat(2,1fr);gap:16px;margin:30px 0}
.nt3-hcard{display:flex;background:#fff;border-radius:12px;overflow:hidden;box-shadow:0 2px 10px rgba(0,0,0,0.04);transition:.3s}.nt3-hcard:hover{transform:translateY(-2px)}
.nt3-hcard .ph-img{width:190px;flex-shrink:0}.nt3-hcard .ph-img img{width:100%;height:100%;object-fit:cover}
.nt3-hcard .ph-body{padding:22px}.nt3-hcard .ph-body .ph-tag{display:inline-block;background:#fee2e2;color:#dc2626;border-radius:4px;padding:2px 10px;font-size:10px;font-weight:700;margin-bottom:8px}
.nt3-hcard .ph-body h4{font-size:16px;font-weight:700;color:#1e293b}.nt3-hcard .ph-body p{font-size:13px;color:#64748b}
.nt3-reviews{display:grid;grid-template-columns:repeat(3,1fr);gap:14px;padding:30px 0}
.nt3-review{background:#fff;border-radius:12px;padding:24px;text-align:center;box-shadow:0 2px 8px rgba(0,0,0,0.03)}
.nt3-review .pr-stars{color:#f59e0b;font-size:14px;margin-bottom:8px}
.nt3-review .pr-text{font-size:13px;color:#64748b;line-height:1.7;font-style:italic}
.nt3-review .pr-name{font-weight:700;font-size:12px;margin-top:8px}
@media(max-width:768px){.nt3-hgrid{grid-template-columns:1fr}.nt3-reviews{grid-template-columns:1fr}}