*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
  html{scroll-behavior:smooth}
  body{font-family:-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,"Helvetica Neue",Arial,"PingFang SC","Hiragino Sans GB","Microsoft YaHei",sans-serif;background:#0a0a0a;color:#e0e0e0;line-height:1.7;overflow-x:hidden}
  a{color:#00e5ff;text-decoration:none;transition:color .3s}
  a:hover{color:#00b8d4}
  img{max-width:100%;display:block}

  /* ===== 顶部导航 ===== */
  .navbar{position:fixed;top:0;left:0;right:0;z-index:1000;background:rgba(10,10,10,.92);backdrop-filter:blur(12px);border-bottom:1px solid rgba(0,229,255,.15)}
  .nav-inner{max-width:1200px;margin:0 auto;padding:0 20px;display:flex;align-items:center;justify-content:space-between;height:60px}
  .logo{font-size:1.3rem;font-weight:800;color:#fff;letter-spacing:1px}
  .logo span{color:#00e5ff}
  .nav-links{display:flex;gap:28px;list-style:none}
  .nav-links a{color:#aaa;font-size:.9rem;font-weight:500}
  .nav-links a:hover{color:#00e5ff}
  .nav-toggle{display:none;background:none;border:none;color:#fff;font-size:1.5rem;cursor:pointer}

  /* ===== Hero 主图模块 ===== */
  .hero{padding:100px 20px 60px;text-align:center;background:radial-gradient(ellipse at 50% 0%,rgba(0,229,255,.08) 0%,transparent 60%)}
  .hero h1{font-size:clamp(1.8rem,5vw,3rem);font-weight:900;color:#fff;margin-bottom:16px;line-height:1.3}
  .hero h1 span{color:#00e5ff}
  .hero p{font-size:clamp(1rem,2.5vw,1.2rem);color:#888;max-width:700px;margin:0 auto 32px}
  .hero-imgs{display:grid;grid-template-columns:repeat(3,1fr);gap:16px;max-width:900px;margin:0 auto}
  .hero-imgs .img-card{aspect-ratio:16/9;background:linear-gradient(135deg,#111 0%,#1a1a2e 100%);border:1px solid rgba(0,229,255,.2);border-radius:12px;display:flex;align-items:center;justify-content:center;color:#444;font-size:.85rem;overflow:hidden;position:relative}
  .hero-imgs .img-card::after{content:attr(data-label);position:absolute;bottom:10px;left:10px;background:rgba(0,0,0,.7);padding:4px 12px;border-radius:20px;font-size:.75rem;color:#00e5ff}
  .hero-imgs .img-card:nth-child(1){--lbl:"智能自瞄系统"}
  .hero-imgs .img-card:nth-child(2){--lbl:"超清透视视野"}
  .hero-imgs .img-card:nth-child(3){--lbl:"零后座压枪"}

  /* ===== 下载按钮 ===== */
  .btn-download{display:inline-flex;align-items:center;gap:10px;padding:16px 48px;background:linear-gradient(135deg,#00e5ff,#0091ea);color:#000;font-size:1.1rem;font-weight:800;border:none;border-radius:50px;cursor:pointer;text-decoration:none;transition:transform .2s,box-shadow .2s}
  .btn-download:hover{transform:translateY(-2px);box-shadow:0 8px 30px rgba(0,229,255,.3)}

  /* ===== 通用 Section ===== */
  .section{max-width:1200px;margin:0 auto;padding:80px 20px}
  .section-title{text-align:center;margin-bottom:50px}
  .section-title h2{font-size:clamp(1.5rem,4vw,2.2rem);font-weight:800;color:#fff;margin-bottom:12px}
  .section-title h2 span{color:#00e5ff}
  .section-title p{color:#666;font-size:1rem}

  /* ===== 功能卡片 ===== */
  .cards{display:grid;grid-template-columns:repeat(auto-fit,minmax(280px,1fr));gap:24px}
  .card{background:linear-gradient(145deg,#111,#0d0d0d);border:1px solid rgba(255,255,255,.06);border-radius:16px;padding:36px 28px;transition:transform .3s,border-color .3s}
  .card:hover{transform:translateY(-4px);border-color:rgba(0,229,255,.3)}
  .card .icon{width:56px;height:56px;background:linear-gradient(135deg,rgba(0,229,255,.15),rgba(0,145,234,.1));border-radius:14px;display:flex;align-items:center;justify-content:center;font-size:1.5rem;margin-bottom:20px}
  .card h3{font-size:1.2rem;font-weight:700;color:#fff;margin-bottom:10px}
  .card p{color:#777;font-size:.95rem;line-height:1.8}

  /* ===== 功能介绍列表 ===== */
  .features{display:grid;grid-template-columns:repeat(auto-fit,minmax(240px,1fr));gap:20px}
  .feature-item{display:flex;gap:14px;align-items:flex-start;padding:20px;background:rgba(255,255,255,.02);border:1px solid rgba(255,255,255,.04);border-radius:12px}
  .feature-item .num{min-width:32px;height:32px;background:linear-gradient(135deg,#00e5ff,#0091ea);color:#000;font-weight:800;font-size:.85rem;border-radius:8px;display:flex;align-items:center;justify-content:center}
  .feature-item h4{color:#fff;font-size:1rem;margin-bottom:4px}
  .feature-item p{color:#666;font-size:.88rem}

  /* ===== 部署教程 ===== */
  .tutorial{background:linear-gradient(145deg,#0f0f1a,#0a0a12);border:1px solid rgba(0,229,255,.1);border-radius:20px;padding:40px;max-width:900px;margin:0 auto}
  .step{display:flex;gap:20px;margin-bottom:30px;align-items:flex-start}
  .step:last-child{margin-bottom:0}
  .step .step-num{min-width:40px;height:40px;background:rgba(0,229,255,.1);color:#00e5ff;font-weight:800;border-radius:10px;display:flex;align-items:center;justify-content:center;font-size:1.1rem;flex-shrink:0}
  .step h4{color:#fff;font-size:1.05rem;margin-bottom:6px}
  .step p{color:#777;font-size:.9rem}

  /* ===== 常见问题 ===== */
  .faq{max-width:800px;margin:0 auto}
  .faq-item{border-bottom:1px solid rgba(255,255,255,.06);padding:20px 0}
  .faq-item:last-child{border-bottom:none}
  .faq-item h4{color:#fff;font-size:1rem;margin-bottom:8px;cursor:default}
  .faq-item p{color:#666;font-size:.9rem}

  /* ===== 底部 ===== */
  .footer{background:#080808;border-top:1px solid rgba(255,255,255,.06);padding:50px 20px 30px}
  .footer-inner{max-width:1200px;margin:0 auto;display:grid;grid-template-columns:repeat(auto-fit,minmax(200px,1fr));gap:40px;margin-bottom:40px}
  .footer h4{color:#fff;font-size:1rem;margin-bottom:16px}
  .footer p,.footer li{color:#555;font-size:.88rem;line-height:2}
  .footer ul{list-style:none}
  .footer-bottom{text-align:center;padding-top:30px;border-top:1px solid rgba(255,255,255,.04);color:#444;font-size:.85rem}

  /* ===== 响应式 ===== */
  @media(max-width:768px){
    .nav-links{display:none;position:absolute;top:60px;left:0;right:0;background:rgba(10,10,10,.98);flex-direction:column;padding:20px;gap:16px;border-bottom:1px solid rgba(0,229,255,.1)}
    .nav-links.active{display:flex}
    .nav-toggle{display:block}
    .hero-imgs{grid-template-columns:1fr;max-width:400px}
    .hero-imgs .img-card{aspect-ratio:4/3}
    .section{padding:50px 16px}
    .tutorial{padding:24px}
  }