:root{
  --blue:#0A84FF;
  --blue-deep:#0066CC;
  --ink:#1D1D1F;
  --gray:#86868B;
  --bg-gray:#F5F5F7;
  --bg-dark:#0B0F1A;
  --radius:18px;
  --maxw:1120px;
  --font:-apple-system,"SF Pro Display","Helvetica Neue",Arial,"PingFang SC","Microsoft YaHei",sans-serif;
}
*{margin:0;padding:0;box-sizing:border-box}
html{scroll-behavior:smooth}
body{font-family:var(--font);color:var(--ink);background:#fff;line-height:1.6;-webkit-font-smoothing:antialiased}
a{color:inherit;text-decoration:none}
sup{font-size:.6em}

/* 导航 */
.nav{position:fixed;top:0;left:0;right:0;z-index:100;transition:.3s}
.nav.scrolled{background:rgba(255,255,255,.72);backdrop-filter:blur(14px);box-shadow:0 1px 0 rgba(0,0,0,.08)}
.nav-inner{max-width:var(--maxw);margin:0 auto;height:56px;display:flex;align-items:center;justify-content:space-between;padding:0 22px}
.brand{display:flex;align-items:center;gap:8px;font-weight:600;font-size:19px;color:#fff;transition:color .3s}
.nav.scrolled .brand{color:var(--ink)}
.nav-links{display:flex;gap:30px}
.nav-links a{font-size:14px;color:rgba(255,255,255,.85);transition:color .3s;position:relative}
.nav.scrolled .nav-links a{color:var(--ink)}
.nav-links a:hover{color:var(--blue)}
.nav-toggle{display:none;flex-direction:column;gap:5px;background:none;border:0;cursor:pointer;padding:6px}
.nav-toggle span{width:22px;height:2px;background:#fff;transition:.3s}
.nav.scrolled .nav-toggle span{background:var(--ink)}

/* Hero */
.hero{position:relative;min-height:100vh;display:flex;align-items:center;justify-content:center;text-align:center;overflow:hidden}
.hero-bg{position:absolute;inset:0;background:radial-gradient(120% 120% at 50% 0%,#16243f 0%,#0b0f1a 55%,#05070d 100%);}
.hero-bg::after{content:"";position:absolute;inset:0;background-image:linear-gradient(rgba(255,255,255,.04) 1px,transparent 1px),linear-gradient(90deg,rgba(255,255,255,.04) 1px,transparent 1px);background-size:48px 48px;mask-image:radial-gradient(80% 60% at 50% 40%,#000,transparent);}
.hero-content{position:relative;z-index:2;color:#fff;padding:0 22px;max-width:820px}
.hero-eyebrow{letter-spacing:.28em;font-size:13px;color:var(--blue);margin-bottom:18px;font-weight:600}
.hero h1{font-size:clamp(40px,7vw,80px);font-weight:700;line-height:1.05;letter-spacing:-.02em}
.hero-sub{margin:24px auto 36px;font-size:clamp(16px,2.2vw,20px);color:rgba(255,255,255,.72);max-width:620px}
.hero-actions{display:flex;gap:16px;justify-content:center;flex-wrap:wrap}
.btn{display:inline-block;padding:13px 30px;border-radius:980px;font-size:15px;font-weight:500;transition:.25s;cursor:pointer}
.btn-primary{background:var(--blue);color:#fff}
.btn-primary:hover{background:var(--blue-deep);transform:translateY(-2px)}
.btn-ghost{border:1px solid rgba(255,255,255,.4);color:#fff}
.btn-ghost:hover{border-color:#fff;background:rgba(255,255,255,.08)}
.scroll-hint{position:absolute;bottom:30px;left:50%;transform:translateX(-50%);width:24px;height:38px;border:2px solid rgba(255,255,255,.4);border-radius:14px;z-index:2}
.scroll-hint::before{content:"";position:absolute;top:7px;left:50%;transform:translateX(-50%);width:4px;height:8px;background:#fff;border-radius:2px;animation:scroll 1.6s infinite}
@keyframes scroll{0%{opacity:0;transform:translate(-50%,0)}40%{opacity:1}80%{opacity:0;transform:translate(-50%,12px)}}

/* 通用 section */
.section{padding:110px 0}
.section-light{background:#fff}
.section-gray{background:var(--bg-gray)}
.section-white{background:#fff}
.section-dark{background:var(--bg-dark);color:#fff}
.container{max-width:var(--maxw);margin:0 auto;padding:0 22px}
.section-head{text-align:center;margin-bottom:60px}
.eyebrow{letter-spacing:.2em;font-size:13px;color:var(--blue);font-weight:600;margin-bottom:12px}
.eyebrow.light{color:#5ac8fa}
.section-head h2{font-size:clamp(28px,4vw,42px);font-weight:700;letter-spacing:-.01em}

/* 关于 */
.about-grid{display:grid;grid-template-columns:1.3fr 1fr;gap:50px;align-items:center}
.about-text p{margin-bottom:18px;color:#333;font-size:17px}
.about-stats{display:grid;grid-template-columns:1fr 1fr;gap:22px}
.stat{background:var(--bg-gray);border-radius:var(--radius);padding:24px;text-align:center}
.stat .num{display:block;font-size:30px;font-weight:700;color:var(--blue)}
.stat .label{font-size:13px;color:var(--gray)}

/* 产品 */
.product-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:22px}
.card{background:#fff;border-radius:var(--radius);padding:30px 24px;box-shadow:0 4px 20px rgba(0,0,0,.05);transition:.3s}
.card:hover{transform:translateY(-6px);box-shadow:0 12px 36px rgba(10,132,255,.15)}
.card-icon{margin-bottom:18px}
.card h3{font-size:19px;margin-bottom:10px}
.card p{font-size:14px;color:var(--gray)}

/* 优势 */
.adv-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:26px}
.adv{text-align:center}
.adv-num{font-size:46px;font-weight:700;color:var(--blue);line-height:1;margin-bottom:14px}
.adv-num span{font-size:20px;margin-left:4px}
.adv h3{font-size:18px;margin-bottom:8px}
.adv p{font-size:14px;color:var(--gray)}

/* 案例 */
.case-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:18px}
.case{margin:0;border-radius:var(--radius);overflow:hidden;background:#11161f}
.case-img{height:220px;background:var(--g,linear-gradient(135deg,#1f3a5f,#0a84ff));transition:.4s}
.case:hover .case-img{transform:scale(1.05)}
.case figcaption{padding:16px;font-size:15px;font-weight:500}

/* 新闻 */
.news-list{list-style:none;max-width:840px;margin:0 auto}
.news-item{display:flex;gap:24px;padding:26px 0;border-bottom:1px solid #e5e5ea;align-items:flex-start}
.news-date{font-size:14px;color:var(--blue);font-weight:600;min-width:60px;padding-top:4px}
.news-item h3{font-size:18px;margin-bottom:6px}
.news-item p{font-size:14px;color:var(--gray)}

/* 联系 */
.contact-grid{display:flex;flex-direction:column;align-items:center;gap:30px;text-align:center}
.contact-info p{font-size:16px;margin-bottom:12px;color:#333}
.contact-info span{display:inline-block;min-width:54px;color:var(--gray);font-size:14px;margin-right:10px}
.contact-btn{margin-top:6px}

/* 页脚 */
.footer{background:var(--bg-dark);color:rgba(255,255,255,.7);padding:48px 0;font-size:13px}
.footer-inner{display:flex;justify-content:space-between;gap:30px;flex-wrap:wrap}
.footer-brand{font-size:18px;color:#fff;font-weight:600}
.footer-meta p{margin-bottom:6px}
.footer-meta a{color:var(--blue);text-decoration:underline}

/* 滚动渐显 */
.reveal{opacity:0;transform:translateY(30px);transition:opacity .8s ease,transform .8s ease}
.reveal.visible{opacity:1;transform:none}

/* 响应式 */
@media(max-width:900px){
  .product-grid,.adv-grid,.case-grid{grid-template-columns:repeat(2,1fr)}
  .about-grid{grid-template-columns:1fr;gap:34px}
}
@media(max-width:640px){
  .nav-links{position:fixed;top:56px;right:0;width:70%;height:calc(100vh - 56px);background:#fff;flex-direction:column;padding:30px;gap:22px;transform:translateX(100%);transition:.3s;box-shadow:-4px 0 20px rgba(0,0,0,.1)}
  .nav-links.open{transform:none}
  .nav-links a{color:var(--ink);font-size:17px}
  .nav-toggle{display:flex}
  .product-grid,.adv-grid,.case-grid{grid-template-columns:1fr}
  .section{padding:80px 0}
  .hero h1{font-size:38px}
}