:root{--navy:#0f172a;--blue:#1e40af;--blue-light:#3b82f6;--bg:#f8fafc;--white:#fff;--text:#1a1a2e;--muted:#5a6478;--border:#e2e8f0;--radius:12px;--shadow:0 1px 3px rgba(0,0,0,.06)}
*{margin:0;padding:0;box-sizing:border-box}
body{font-family:-apple-system,BlinkMacSystemFont,"PingFang SC","Microsoft YaHei","Segoe UI",sans-serif;background:var(--bg);color:var(--text);line-height:1.7;font-size:16px;-webkit-font-smoothing:antialiased}
a{color:var(--blue);text-decoration:none;transition:color .2s}
a:hover{color:var(--blue-light)}
img{display:block;max-width:100%}
.container{max-width:1200px;margin:0 auto;padding:0 24px}
/* 顶导航 */
.header{background:var(--navy);position:sticky;top:0;z-index:100}
.header .container{display:flex;align-items:center;justify-content:space-between;height:64px}
.logo{font-size:20px;font-weight:700;color:#fff;display:flex;align-items:center;gap:10px}
.logo img{border-radius:6px}
.nav{display:flex;gap:6px;align-items:center;flex-wrap:wrap}
.nav a{color:#cbd5e1;font-size:15px;font-weight:500;padding:8px 16px;border-radius:8px}
.nav a:hover{color:#fff}
.nav a.active{background:var(--blue-light);color:#fff}
.btn-nav{background:var(--blue-light);color:#fff!important;padding:9px 22px;border-radius:8px;font-weight:600!important}
.btn-nav:hover{background:var(--blue)!important}
/* Hero 虚化底图 */
.hero{background:url("../images/hero-bg.jpg") center/cover no-repeat;color:var(--text);padding:90px 0;position:relative;overflow:hidden}
.hero::before{content:"";position:absolute;inset:0;background:linear-gradient(135deg,rgba(255,255,255,.45) 0%,rgba(255,255,255,.05) 60%,rgba(191,219,254,.1) 100%)}
.hero .container{position:relative;z-index:2}
.hero h1{font-size:46px;font-weight:800;line-height:1.3;margin-bottom:18px;color:#0f172a}
.hero h1 span{color:var(--blue)}
.hero .subtitle{color:#334155;font-size:17px;margin-bottom:32px;line-height:1.8;max-width:600px}
.hero .cta-group{display:flex;gap:14px;flex-wrap:wrap}
.btn-hero{background:var(--blue);color:#fff;padding:14px 38px;border-radius:8px;font-weight:700;font-size:16px;display:inline-block;box-shadow:0 8px 24px rgba(30,64,175,.25)}
.btn-hero:hover{background:var(--blue-light);color:#fff}
.btn-hero-ghost{border:2px solid var(--blue);color:var(--blue);padding:14px 38px;border-radius:8px;font-weight:600;font-size:16px;display:inline-block}
.btn-hero-ghost:hover{background:var(--blue);color:#fff}
.hero .badge-row{display:flex;gap:24px;margin-top:32px;flex-wrap:wrap}
.hero .badge-row span{display:flex;align-items:center;gap:6px;font-size:14px;color:#334155;font-weight:500}
/* 区块 */
.section{padding:64px 0}
.section-title{font-size:30px;font-weight:700;color:var(--text);text-align:center;margin-bottom:12px}
.section-sub{color:var(--muted);font-size:16px;text-align:center;margin-bottom:44px;max-width:640px;margin-left:auto;margin-right:auto}
/* 功能卡 */
.feat-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(280px,1fr));gap:22px}
.feat-card{background:var(--white);padding:30px 24px;border-radius:var(--radius);box-shadow:var(--shadow);border:1px solid var(--border);transition:all .25s}
.feat-card:hover{transform:translateY(-5px);border-color:var(--blue-light);box-shadow:0 12px 32px rgba(30,64,175,.14)}
.feat-card .f-icon{font-size:38px;margin-bottom:14px}
.feat-card h3{font-size:18px;margin-bottom:8px;color:var(--text)}
.feat-card p{color:var(--muted);font-size:14px;line-height:1.7}
/* 图片展示 */
.img-showcase{display:grid;grid-template-columns:1fr 1fr 1fr;gap:20px;margin-bottom:20px}
.sc-card{background:var(--white);border-radius:var(--radius);overflow:hidden;border:1px solid var(--border);box-shadow:var(--shadow)}
.sc-card .sc-img{height:180px;overflow:hidden}
.sc-card .sc-img img{width:100%;height:100%;object-fit:cover;transition:transform .4s}
.sc-card:hover .sc-img img{transform:scale(1.06)}
.sc-card .sc-body{padding:18px}
.sc-card .sc-body h3{font-size:16px;margin-bottom:5px;color:var(--text)}
.sc-card .sc-body p{color:var(--muted);font-size:13px}
/* 正文 */
.content-section{background:var(--white);border-radius:var(--radius);padding:44px;box-shadow:var(--shadow);border:1px solid var(--border)}
.content-section h2{font-size:22px;font-weight:600;color:var(--text);margin:26px 0 12px}
.content-section h2:first-child{margin-top:0}
.content-section p{margin-bottom:14px;color:#3a4050;line-height:1.9}
.content-section ul,.content-section ol{margin:14px 0;padding-left:24px;color:#3a4050}
.content-section li{margin-bottom:8px}
.content-section strong{color:var(--blue)}
/* FAQ */
.faq-item{border-bottom:1px solid var(--border);padding:20px 0}
.faq-item:last-child{border-bottom:none}
.faq-item h2{font-size:18px;font-weight:600;color:var(--text);margin-bottom:8px;margin-top:0}
.faq-item p{color:var(--muted);line-height:1.8}
/* 下载卡 */
.dl-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(260px,1fr));gap:20px}
.dl-card{background:var(--white);padding:28px;border-radius:var(--radius);border:1px solid var(--border);text-align:center;box-shadow:var(--shadow);transition:all .25s}
.dl-card:hover{transform:translateY(-4px);border-color:var(--blue-light);box-shadow:0 12px 32px rgba(30,64,175,.14)}
.dl-card .d-icon{font-size:40px;margin-bottom:12px}
.dl-card h3{font-size:18px;margin-bottom:6px;color:var(--text)}
.dl-card .d-ver{font-size:13px;color:var(--muted);margin-bottom:16px}
.dl-card .d-btn{display:inline-block;background:var(--blue);color:#fff;padding:10px 30px;border-radius:8px;font-weight:600;font-size:14px}
.dl-card .d-btn:hover{background:var(--blue-light);color:#fff}
/* 文章卡 */
.article-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(300px,1fr));gap:22px}
.article-card{background:var(--white);border-radius:var(--radius);overflow:hidden;border:1px solid var(--border);box-shadow:var(--shadow);transition:all .25s}
.article-card:hover{transform:translateY(-4px);border-color:var(--blue-light)}
.article-card .ac-img{height:170px;overflow:hidden}
.article-card .ac-img img{width:100%;height:100%;object-fit:cover;transition:transform .4s}
.article-card:hover .ac-img img{transform:scale(1.05)}
.article-card .ac-body{padding:20px}
.article-card .ac-cat{display:inline-block;background:#eef2ff;color:var(--blue);padding:4px 12px;border-radius:6px;font-size:12px;font-weight:600;margin-bottom:10px}
.article-card .ac-body h3{font-size:17px;margin-bottom:8px;color:var(--text)}
.article-card .ac-body p{color:var(--muted);font-size:14px;line-height:1.7;margin-bottom:12px}
.article-card .ac-more{font-weight:600;font-size:14px}
/* 文章详情 */
article{max-width:820px;margin:0 auto;padding:40px 0}
article h1{font-size:30px;font-weight:700;margin-bottom:10px;line-height:1.4;color:var(--text)}
.meta{font-size:13px;color:var(--muted);margin-bottom:26px;padding-bottom:18px;border-bottom:1px solid var(--border)}
article h2{font-size:22px;font-weight:600;margin:30px 0 12px;color:var(--text)}
article p{margin-bottom:14px;color:#3a4050;line-height:1.9}
article ul,article ol{margin:0 0 18px 24px;color:#3a4050}
article li{margin-bottom:8px}
article strong{color:var(--blue)}
/* CTA */
.cta-section{background:linear-gradient(135deg,#1e3a8a,#1e40af);border-radius:var(--radius);text-align:center;padding:64px 24px;color:#fff;margin:40px auto}
.cta-section h2{font-size:28px;margin-bottom:12px;color:#fff}
.cta-section p{opacity:.9;margin-bottom:28px}
.cta-section .btn-white{background:#fff;color:var(--blue);padding:14px 42px;border-radius:8px;font-weight:700;font-size:16px;display:inline-block}
.cta-section .btn-white:hover{background:#e2e8f0;color:var(--blue)}
/* footer */
footer{background:var(--navy);color:#94a3b8;padding:48px 0 30px;margin-top:60px}
footer .f-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(160px,1fr));gap:28px;margin-bottom:26px}
footer h4{color:#fff;margin-bottom:12px;font-size:15px}
footer a{display:block;color:#94a3b8;margin-bottom:8px;font-size:14px}
footer a:hover{color:#fff}
footer .f-bot{border-top:1px solid #1e293b;padding-top:20px;text-align:center;font-size:13px}
footer .f-bot a{display:inline;color:#cbd5e1}
@media(max-width:768px){
  .header .container{height:auto;flex-direction:column;padding:12px 0;gap:10px}
  .nav{justify-content:center}
  .nav a{padding:6px 12px;font-size:14px}
  .hero{padding:52px 0 60px}
  .hero h1{font-size:28px}
  .img-showcase{grid-template-columns:1fr}
  .content-section{padding:24px}
  article{padding:24px 0}
  body{font-size:16px}
}
@media(max-width:480px){
  .hero .cta-group{flex-direction:column}
  .feat-grid,.dl-grid,.article-grid{grid-template-columns:1fr}
  .nav a{padding:5px 8px;font-size:12px}
}