/* ===== AI Dark Theme - 银华电子 ===== */
*,*::before,*::after{margin:0;padding:0;box-sizing:border-box}
:root{
  --bg:#050810;--bg2:#0a0f1a;--bg3:#0d1424;
  --card:rgba(12,18,36,.75);--card-b:rgba(30,58,95,.2);
  --blue:#3b82f6;--cyan:#06b6d4;--teal:#14b8a6;--purple:#8b5cf6;
  --pink:#ec4899;--green:#22c55e;--amber:#f59e0b;--red:#ef4444;
  --t1:#e8edf5;--t2:#94a3b8;--t3:#64748b;
  --grad:linear-gradient(135deg,#3b82f6,#06b6d4,#14b8a6);
  --grad2:linear-gradient(135deg,#8b5cf6,#3b82f6,#06b6d4);
  --glow:0 0 30px rgba(6,182,212,.12);
  --border:rgba(59,130,246,.1);--border-light:rgba(59,130,246,.06);
  --shadow-sm:0 2px 12px rgba(0,0,0,.3);
  --shadow:0 8px 32px rgba(0,0,0,.4);
  --shadow-lg:0 16px 48px rgba(0,0,0,.5);
  --radius:16px;--radius-sm:10px;
}
html{scroll-behavior:smooth}
body{font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Microsoft YaHei",sans-serif;background:var(--bg);color:var(--t1);line-height:1.6;overflow-x:hidden}
::-webkit-scrollbar{width:6px}
::-webkit-scrollbar-track{background:transparent}
::-webkit-scrollbar-thumb{background:rgba(59,130,246,.3);border-radius:3px}
a{color:inherit;text-decoration:none;transition:color .2s}
img{max-width:100%;height:auto}

/* ===== Container ===== */
.container{max-width:1200px;margin:0 auto;padding:0 24px}

/* ===== Section Header ===== */
.section-header{text-align:center;margin-bottom:48px}
.badge{display:inline-flex;align-items:center;gap:8px;padding:5px 16px;border-radius:16px;background:rgba(59,130,246,.1);border:1px solid rgba(59,130,246,.15);font-size:11px;color:var(--cyan);font-weight:600;letter-spacing:1px;margin-bottom:14px}
.badge i{font-size:12px}
.section-header h2{font-size:clamp(24px,3vw,34px);font-weight:800;color:var(--t1);margin-bottom:10px}
.section-header em{font-style:normal;background:var(--grad);-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text}
.section-header p{font-size:14px;color:var(--t2);max-width:560px;margin:0 auto}

/* ===== Animations ===== */
.fade-up{opacity:0;transform:translateY(24px);transition:all .6s cubic-bezier(.16,1,.3,1)}
.fade-up.visible{opacity:1;transform:translateY(0)}

/* ===== Header / Navbar ===== */
.header{position:fixed;top:0;left:0;right:0;z-index:100;backdrop-filter:blur(20px);background:rgba(5,8,16,.85);border-bottom:1px solid var(--border);transition:all .3s}
.header.scrolled{background:rgba(5,8,16,.95);box-shadow:0 2px 30px rgba(0,0,0,.4)}
.navbar{display:flex;align-items:center;justify-content:space-between;padding:0 32px;height:64px;max-width:1400px;margin:0 auto}
.logo{display:flex;align-items:center;gap:10px}
.logo-img{width:36px;height:36px;border-radius:8px;object-fit:cover}
.logo-text{font-size:14px;font-weight:700;color:var(--t1);line-height:1.3}
.logo-text small{display:block;font-size:9px;font-weight:400;color:var(--t3);letter-spacing:.5px}
.nav-links{display:flex;align-items:center;gap:4px}
.nav-item{position:relative}
.nav-item>a{display:block;padding:8px 14px;font-size:13px;color:var(--t2);font-weight:500;border-radius:8px;transition:all .2s}
.nav-item>a:hover,.nav-item>a.active{color:var(--t1);background:rgba(59,130,246,.06)}
.nav-item>a .arrow{font-size:10px;margin-left:3px;transition:transform .2s}
.nav-item:hover .arrow{transform:rotate(180deg)}
.dropdown{position:absolute;top:100%;left:0;min-width:220px;background:rgba(10,15,26,.95);backdrop-filter:blur(20px);border:1px solid var(--card-b);border-radius:12px;padding:8px;opacity:0;visibility:hidden;transform:translateY(8px);transition:all .25s;box-shadow:var(--shadow-lg);z-index:200}
.nav-item:hover .dropdown{opacity:1;visibility:visible;transform:translateY(0)}
.dropdown a{display:flex;align-items:center;gap:10px;padding:9px 14px;font-size:12px;color:var(--t2);border-radius:8px;transition:all .2s}
.dropdown a:hover{background:rgba(59,130,246,.1);color:var(--t1)}
.dd-icon{width:28px;height:28px;border-radius:7px;background:rgba(59,130,246,.1);display:flex;align-items:center;justify-content:center;font-size:12px;color:var(--cyan);flex-shrink:0}
.nav-cta{padding:7px 18px!important;border-radius:8px!important;background:var(--grad)!important;color:#fff!important;font-weight:600!important;box-shadow:0 2px 15px rgba(6,182,212,.2);border:none!important}
.nav-cta:hover{box-shadow:0 4px 25px rgba(6,182,212,.35)!important;transform:translateY(-1px)}
.mobile-toggle{display:none;flex-direction:column;gap:4px;cursor:pointer;padding:8px}
.mobile-toggle span{width:20px;height:2px;background:var(--t2);border-radius:2px;transition:all .3s}

/* ===== About / Generic Sections ===== */
.about{padding:70px 0;background:var(--bg)}
.about:nth-child(even){background:var(--bg2)}
.about-grid{display:grid;grid-template-columns:1fr;gap:24px}
.about-content h3{font-size:20px;font-weight:700;margin-bottom:14px;background:var(--grad);-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text}
.about-content p{font-size:14px;color:var(--t2);line-height:1.8;margin-bottom:12px}

/* ===== Positioning Grid ===== */
.positioning-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:20px}
.pos-card{background:var(--card);border:1px solid var(--card-b);border-radius:var(--radius);padding:28px;text-align:center;transition:all .3s;position:relative;overflow:hidden}
.pos-card::before{content:'';position:absolute;top:0;left:0;right:0;height:2px;background:var(--grad);opacity:0;transition:opacity .3s}
.pos-card:hover{transform:translateY(-4px);border-color:rgba(59,130,246,.3);box-shadow:var(--glow)}
.pos-card:hover::before{opacity:1}
.pos-icon{width:52px;height:52px;border-radius:13px;background:rgba(59,130,246,.1);display:flex;align-items:center;justify-content:center;margin:0 auto 16px;font-size:22px;color:var(--cyan)}
.pos-card h4{font-size:16px;font-weight:700;margin-bottom:10px;color:var(--t1)}
.pos-card p{font-size:13px;color:var(--t2);line-height:1.7}

/* ===== Business Grid ===== */
.business-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:20px}
.business-card{background:var(--card);border:1px solid var(--card-b);border-radius:var(--radius);padding:24px;transition:all .3s}
.business-card:hover{border-color:rgba(59,130,246,.3);transform:translateY(-3px);box-shadow:var(--glow)}
.biz-header{display:flex;align-items:center;gap:12px;margin-bottom:16px}
.biz-icon{width:42px;height:42px;border-radius:10px;background:rgba(6,182,212,.1);display:flex;align-items:center;justify-content:center;font-size:18px;color:var(--cyan);flex-shrink:0}
.biz-header h4{font-size:14px;font-weight:700;color:var(--t1)}
.business-card ul{list-style:none;padding:0}
.business-card li{font-size:13px;color:var(--t2);padding:6px 0;padding-left:16px;position:relative;line-height:1.6}
.business-card li::before{content:'';position:absolute;left:0;top:13px;width:5px;height:5px;border-radius:50%;background:var(--cyan)}

/* ===== Team ===== */
.team-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:20px}
.team-card{background:var(--card);border:1px solid var(--card-b);border-radius:var(--radius);padding:28px;text-align:center;transition:all .3s}
.team-card:hover{border-color:rgba(139,92,246,.3);transform:translateY(-3px);box-shadow:0 0 30px rgba(139,92,246,.1)}
.team-avatar{width:64px;height:64px;border-radius:50%;background:var(--grad);display:flex;align-items:center;justify-content:center;margin:0 auto 14px;font-size:24px;color:#fff}
.team-card h4{font-size:16px;font-weight:700;margin-bottom:4px}
.team-card .role{font-size:12px;color:var(--cyan);font-weight:600;margin-bottom:10px}
.team-card .desc{font-size:12px;color:var(--t2);line-height:1.6}

/* ===== Honors ===== */
.honors-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:20px}
.honor-card{background:var(--card);border:1px solid var(--card-b);border-radius:var(--radius);padding:24px;text-align:center;transition:all .3s;position:relative}
.honor-card:hover{border-color:rgba(245,158,11,.3);transform:translateY(-3px);box-shadow:0 0 30px rgba(245,158,11,.08)}
.honor-card .icon{font-size:28px;color:var(--amber);margin-bottom:12px}
.honor-card h4{font-size:14px;font-weight:700;margin-bottom:6px}
.honor-year{display:inline-block;padding:2px 10px;border-radius:10px;background:rgba(245,158,11,.1);color:var(--amber);font-size:11px;font-weight:600;margin-bottom:8px}
.honor-card p{font-size:12px;color:var(--t2);line-height:1.6}

/* ===== Timeline ===== */
.timeline{position:relative;padding-left:40px}
.timeline::before{content:'';position:absolute;left:15px;top:0;bottom:0;width:2px;background:linear-gradient(180deg,var(--blue),var(--cyan),var(--teal))}
.timeline-item{position:relative;margin-bottom:28px;padding-left:24px}
.timeline-item::before{content:'';position:absolute;left:-26px;top:6px;width:12px;height:12px;border-radius:50%;background:var(--grad);border:2px solid var(--bg);box-shadow:0 0 10px rgba(6,182,212,.3)}
.tl-year{display:inline-block;padding:3px 12px;border-radius:10px;background:rgba(59,130,246,.1);color:var(--cyan);font-size:12px;font-weight:700;margin-bottom:6px}
.tl-content h4{font-size:15px;font-weight:700;margin-bottom:4px}
.tl-content p{font-size:13px;color:var(--t2)}

/* ===== Values ===== */
.values-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:20px}
.value-card{background:var(--card);border:1px solid var(--card-b);border-radius:var(--radius);padding:28px;text-align:center;transition:all .3s}
.value-card:hover{border-color:rgba(59,130,246,.3);transform:translateY(-3px)}
.val-icon{width:48px;height:48px;border-radius:12px;background:rgba(59,130,246,.1);display:flex;align-items:center;justify-content:center;margin:0 auto 14px;font-size:20px;color:var(--cyan)}
.value-card h4{font-size:15px;font-weight:700;margin-bottom:8px}
.value-card p{font-size:12px;color:var(--t2);line-height:1.7}

/* ===== Products ===== */
.products{padding:70px 0;background:var(--bg2)}
.products-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(280px,1fr));gap:20px}
.product-card{background:var(--card);border:1px solid var(--card-b);border-radius:var(--radius);padding:28px;transition:all .3s;position:relative;overflow:hidden}
.product-card::after{content:'';position:absolute;top:0;left:0;right:0;height:2px;background:var(--grad);opacity:0;transition:opacity .3s}
.product-card:hover{transform:translateY(-4px);border-color:rgba(59,130,246,.3);box-shadow:var(--glow)}
.product-card:hover::after{opacity:1}
.product-icon{width:48px;height:48px;border-radius:12px;background:rgba(59,130,246,.1);display:flex;align-items:center;justify-content:center;margin-bottom:16px;font-size:22px;color:var(--cyan)}
.product-card h3{font-size:16px;font-weight:700;margin-bottom:8px}
.product-card p{font-size:13px;color:var(--t2);line-height:1.7;margin-bottom:14px}
.learn-more{font-size:12px;color:var(--cyan);font-weight:600;display:inline-flex;align-items:center;gap:6px;transition:all .2s}
.learn-more:hover{color:var(--blue);gap:10px}

/* ===== Solutions ===== */
.solutions{padding:70px 0;background:var(--bg)}
.solutions-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(340px,1fr));gap:20px}
.solution-card{display:flex;gap:20px;background:var(--card);border:1px solid var(--card-b);border-radius:var(--radius);padding:28px;transition:all .3s;position:relative;overflow:hidden}
.solution-card:hover{border-color:rgba(139,92,246,.3);transform:translateY(-3px);box-shadow:0 0 30px rgba(139,92,246,.1)}
.solution-num{font-size:36px;font-weight:900;background:var(--grad);-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text;opacity:.3;line-height:1;flex-shrink:0}
.solution-card h3{font-size:16px;font-weight:700;margin-bottom:8px}
.solution-card p{font-size:13px;color:var(--t2);line-height:1.7}

/* ===== News ===== */
.news{padding:70px 0;background:var(--bg2)}
.news-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:20px}
.news-card{background:var(--card);border:1px solid var(--card-b);border-radius:var(--radius);overflow:hidden;transition:all .3s}
.news-card:hover{border-color:rgba(59,130,246,.3);transform:translateY(-3px)}
.news-thumb{height:140px;background:linear-gradient(135deg,rgba(59,130,246,.15),rgba(6,182,212,.15));display:flex;align-items:center;justify-content:center;font-size:36px;color:var(--cyan)}
.news-body{padding:20px}
.news-body .date{font-size:11px;color:var(--cyan);font-weight:600;margin-bottom:6px}
.news-body h3{font-size:15px;font-weight:700;margin-bottom:8px}
.news-body p{font-size:12px;color:var(--t2);line-height:1.7}

/* ===== Cases ===== */
.cases{padding:70px 0;background:var(--bg)}
.cases-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:20px}
.case-card{height:200px;border-radius:var(--radius);overflow:hidden;position:relative;background:linear-gradient(135deg,rgba(59,130,246,.12),rgba(139,92,246,.12));border:1px solid var(--card-b);transition:all .3s;cursor:pointer}
.case-card:hover{border-color:rgba(59,130,246,.3);transform:scale(1.02)}
.case-overlay{position:absolute;inset:0;padding:24px;display:flex;flex-direction:column;justify-content:flex-end;background:linear-gradient(180deg,transparent 30%,rgba(5,8,16,.9) 100%)}
.case-tag{display:inline-block;padding:3px 10px;border-radius:10px;background:rgba(6,182,212,.15);color:var(--cyan);font-size:10px;font-weight:600;margin-bottom:8px;width:fit-content}
.case-overlay h3{font-size:15px;font-weight:700;margin-bottom:4px}
.case-overlay p{font-size:11px;color:var(--t2);line-height:1.5}

/* ===== Standards ===== */
.standards{padding:70px 0;background:var(--bg2)}
.standards-list{display:grid;grid-template-columns:repeat(2,1fr);gap:16px}
.standard-item{display:flex;gap:14px;background:var(--card);border:1px solid var(--card-b);border-radius:var(--radius-sm);padding:20px;transition:all .3s}
.standard-item:hover{border-color:rgba(59,130,246,.3)}
.standard-item .icon{font-size:20px;color:var(--cyan);flex-shrink:0;margin-top:2px}
.standard-item h4{font-size:14px;font-weight:700;margin-bottom:4px}
.standard-item p{font-size:12px;color:var(--t2)}

/* ===== Advantages ===== */
.advantages{padding:70px 0;background:var(--bg)}
.advantages-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:20px}
.adv-card{background:var(--card);border:1px solid var(--card-b);border-radius:var(--radius);padding:28px;text-align:center;transition:all .3s}
.adv-card:hover{border-color:rgba(6,182,212,.3);transform:translateY(-3px);box-shadow:var(--glow)}
.adv-icon{font-size:32px;color:var(--cyan);margin-bottom:14px}
.adv-card h4{font-size:15px;font-weight:700;margin-bottom:8px}
.adv-card p{font-size:12px;color:var(--t2);line-height:1.7}

/* ===== CTA Section ===== */
.cta-section{padding:60px 0;text-align:center;background:linear-gradient(135deg,rgba(59,130,246,.06),rgba(6,182,212,.06));border-top:1px solid var(--border);border-bottom:1px solid var(--border)}
.cta-section h2{font-size:clamp(22px,3vw,30px);font-weight:800;margin-bottom:10px}
.cta-section p{font-size:14px;color:var(--t2);margin-bottom:24px}
.cta-section .btn{padding:12px 32px;border-radius:10px;background:var(--grad);color:#fff;font-size:14px;font-weight:600;border:none;cursor:pointer;transition:all .3s;box-shadow:0 4px 20px rgba(6,182,212,.25);display:inline-flex;align-items:center;gap:8px}
.cta-section .btn:hover{transform:translateY(-2px);box-shadow:0 8px 35px rgba(6,182,212,.4)}

/* ===== Contact ===== */
.contact{padding:70px 0;background:var(--bg2)}
.contact-grid{display:grid;grid-template-columns:1fr 1fr auto;gap:30px}
.contact-info{display:flex;flex-direction:column;gap:18px;margin-bottom:20px}
.contact-item{display:flex;gap:14px;align-items:flex-start}
.contact-item .icon{width:40px;height:40px;border-radius:10px;background:rgba(59,130,246,.1);display:flex;align-items:center;justify-content:center;font-size:16px;color:var(--cyan);flex-shrink:0}
.contact-item h4{font-size:13px;font-weight:700;margin-bottom:3px}
.contact-item p{font-size:12px;color:var(--t2)}
.contact-map{background:var(--card);border:1px solid var(--card-b);border-radius:var(--radius-sm);padding:20px;font-size:13px;color:var(--t3);text-align:center;min-height:80px;display:flex;align-items:center;justify-content:center}
.contact-form{background:var(--card);border:1px solid var(--card-b);border-radius:var(--radius);padding:28px}
.contact-form h3{font-size:18px;font-weight:700;margin-bottom:6px}
.contact-form>p{font-size:12px;color:var(--t2);margin-bottom:18px}
.contact-form input,.contact-form textarea{width:100%;padding:10px 14px;border-radius:8px;border:1px solid var(--card-b);background:rgba(5,8,16,.6);color:var(--t1);font-size:13px;outline:none;transition:border-color .2s;font-family:inherit}
.contact-form input:focus,.contact-form textarea:focus{border-color:var(--cyan)}
.contact-form input::placeholder,.contact-form textarea::placeholder{color:var(--t3)}
.contact-form .btn-primary{padding:10px 24px;border-radius:8px;background:var(--grad);color:#fff;font-size:13px;font-weight:600;border:none;cursor:pointer;transition:all .3s;display:inline-flex;align-items:center;gap:6px}
.contact-form .btn-primary:hover{transform:translateY(-1px);box-shadow:0 4px 20px rgba(6,182,212,.3)}
.contact-qr h3{font-size:16px;font-weight:700;margin-bottom:6px}
.contact-qr p{font-size:12px;color:var(--t2)}

/* ===== AI Knowledge / FAQ ===== */
.ai-knowledge{padding:70px 0;background:linear-gradient(135deg,rgba(59,130,246,.03),rgba(139,92,246,.03))!important;border-top:1px solid var(--border)}
.faq-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(350px,1fr));gap:20px;margin-top:0}
.faq-item{background:var(--card)!important;border-radius:var(--radius)!important;padding:24px!important;transition:all .3s ease!important;border:1px solid var(--card-b)!important;box-shadow:none!important}
.faq-item:hover{transform:translateY(-3px)!important;box-shadow:var(--glow)!important;border-color:rgba(59,130,246,.3)!important}
.faq-item h3{font-size:14px!important;color:var(--t1)!important;margin-bottom:10px!important;display:flex!important;align-items:center!important;gap:10px!important}
.faq-item h3 i{color:var(--cyan)!important;font-size:16px!important}
.faq-item p{color:var(--t2)!important;font-size:12px!important;line-height:1.7!important}

/* ===== Footer ===== */
.footer{background:var(--bg3);border-top:1px solid var(--border);padding:50px 0 0}
.footer-grid{display:grid;grid-template-columns:1.5fr 1fr 1fr 1fr;gap:30px;padding-bottom:30px}
.footer-brand .logo-text{font-size:15px;margin-bottom:10px}
.footer-brand p{font-size:12px;color:var(--t3);line-height:1.7}
.footer h4{font-size:13px;font-weight:700;color:var(--t1);margin-bottom:14px}
.footer ul{list-style:none}
.footer li{margin-bottom:8px}
.footer li a{font-size:12px;color:var(--t3);transition:color .2s}
.footer li a:hover{color:var(--cyan)}
.footer-bottom{text-align:center;padding:20px 0;border-top:1px solid var(--border);font-size:11px;color:var(--t3)}
.footer-qr .qr-item{display:flex;flex-direction:column;align-items:center;gap:8px}
.footer-qr span{font-size:11px;color:var(--t3)}

/* ===== Float Buttons ===== */
.float-consult{position:fixed;bottom:30px;right:24px;z-index:999;display:flex;flex-direction:column;gap:10px}
.float-btn{width:44px;height:44px;border-radius:12px;border:none;cursor:pointer;display:flex;align-items:center;justify-content:center;font-size:16px;transition:all .3s;box-shadow:var(--shadow)}
.float-btn.top{background:var(--card);border:1px solid var(--card-b);color:var(--cyan);backdrop-filter:blur(10px)}
.float-btn.top:hover{background:rgba(59,130,246,.15);transform:translateY(-2px)}

/* ===== QR Modal ===== */
.qr-modal{position:fixed;inset:0;z-index:9999;background:rgba(0,0,0,.7)!important;backdrop-filter:blur(8px);display:none;align-items:center;justify-content:center}

/* ===== Responsive ===== */
@media(max-width:1024px){
  .positioning-grid,.business-grid,.team-grid,.values-grid,.advantages-grid{grid-template-columns:repeat(2,1fr)}
  .contact-grid{grid-template-columns:1fr}
  .footer-grid{grid-template-columns:repeat(2,1fr)}
}
@media(max-width:768px){
  .nav-links{display:none!important}
  .mobile-toggle{display:flex}
  .navbar{padding:0 16px}
  .positioning-grid,.business-grid,.team-grid,.values-grid,.advantages-grid,.news-grid,.cases-grid,.honors-grid,.standards-list,.products-grid,.solutions-grid,.faq-grid{grid-template-columns:1fr}
  .about{padding:40px 0}
  .products,.solutions,.news,.cases,.standards,.advantages,.contact,.ai-knowledge{padding:40px 0}
  .footer-grid{grid-template-columns:1fr}
  .contact-grid{gap:20px}
  .hero-stats{flex-direction:column;gap:16px}
}