/* 风格C：工业深灰 */
:root{--primary:#2c3e50;--primary-light:#34495e;--accent:#e74c3c;--accent-dark:#c0392b;--bg:#fff;--bg-alt:#ecf0f1;--text:#2c3e50;--text-light:#7f8c8d;--border:#bdc3c7;--shadow:0 4px 16px rgba(44,62,80,.1);--shadow-hover:0 10px 30px rgba(44,62,80,.2);--radius:2px;}
*
*{margin:0;padding:0;box-sizing:border-box;}
html{scroll-behavior:smooth;}
body{font-family:"PingFang SC","Microsoft YaHei","Hiragino Sans GB","Helvetica Neue",Arial,sans-serif;color:var(--text);line-height:1.7;background:var(--bg);overflow-x:hidden;}
a{text-decoration:none;color:inherit;}
img{max-width:100%;display:block;}
.container{max-width:1200px;margin:0 auto;padding:0 20px;}
.section{padding:80px 0;}
.section-alt{background:var(--bg-alt);}
.section-header{text-align:center;margin-bottom:56px;}
.section-title{font-size:36px;font-weight:800;color:var(--primary);margin-bottom:14px;}
.section-title .accent{color:var(--accent);}
.section-subtitle{font-size:16px;color:var(--text-light);max-width:640px;margin:0 auto;}
.reveal{opacity:0;transform:translateY(30px);transition:opacity .6s ease,transform .6s ease;}
.reveal.visible{opacity:1;transform:translateY(0);}
.footer{background:var(--primary);color:rgba(255,255,255,.7);padding:60px 0 0;}
.footer-top{display:grid;grid-template-columns:1.5fr 1fr 1fr;gap:40px;padding-bottom:40px;border-bottom:1px solid rgba(255,255,255,.1);}
.footer-brand h4{font-size:20px;font-weight:700;color:#fff;margin-bottom:14px;}
.footer-brand p{font-size:14px;line-height:1.8;margin-bottom:16px;}
.footer-col h4{font-size:16px;font-weight:600;color:#fff;margin-bottom:16px;}
.footer-links{display:grid;grid-template-columns:1fr 1fr;gap:10px;list-style:none;}
.footer-links a{font-size:14px;color:rgba(255,255,255,.7);transition:color .3s;}
.footer-links a:hover{color:var(--accent);}
.footer-contact{list-style:none;}
.footer-contact li{font-size:14px;padding:6px 0;}
.footer-bottom{padding:24px 0;text-align:center;font-size:13px;}
.footer-bottom a{color:rgba(255,255,255,.8);margin:0 6px;}
.footer-bottom a:hover{color:var(--accent);}
.footer-bottom .links{margin-top:6px;}
@media(max-width:1024px){.footer-top{grid-template-columns:1fr 1fr;}}
@media(max-width:768px){.section{padding:50px 0;}.section-title{font-size:26px;}.footer-top{grid-template-columns:1fr;}}

body{background:linear-gradient(180deg,#fff 0%,#f8f9fa 100%);}
.banner-section{position:relative;min-height:620px;background:linear-gradient(135deg,#2c3e50 0%,#34495e 50%,#1a252f 100%);overflow:hidden;}
.banner-section::before{content:'';position:absolute;inset:0;background:repeating-linear-gradient(90deg,transparent,transparent 60px,rgba(255,255,255,.02) 60px,rgba(255,255,255,.02) 61px);}
.banner-section::after{content:'';position:absolute;bottom:0;left:0;right:0;height:4px;background:linear-gradient(90deg,var(--accent),#f39c12,var(--accent));}
.banner-inner{position:relative;z-index:2;}
.banner-nav{display:flex;align-items:center;justify-content:space-between;padding:22px 0;border-bottom:1px solid rgba(255,255,255,.1);}
.logo-text{font-size:28px;font-weight:900;color:#fff;letter-spacing:2px;text-transform:uppercase;}
.logo-text .tm{font-size:11px;vertical-align:super;color:var(--accent);margin-left:2px;}
.logo-text .biz{font-size:22px;font-weight:700;color:var(--accent);margin-left:8px;letter-spacing:1px;}
.nav-menu{display:flex;gap:28px;list-style:none;flex-wrap:wrap;}
.nav-menu a{color:rgba(255,255,255,.85);font-size:14px;font-weight:600;letter-spacing:.5px;text-transform:uppercase;padding:6px 0;transition:color .3s;border-bottom:2px solid transparent;}
.nav-menu a:hover{color:var(--accent);border-bottom-color:var(--accent);}
.nav-cta{color:var(--accent)!important;border-color:var(--accent)!important;}
.banner-content{padding:60px 0 80px;position:relative;}
.banner-content::before{content:'';position:absolute;top:50%;right:-100px;width:400px;height:400px;border:1px solid rgba(231,76,60,.2);border-radius:50%;transform:translateY(-50%);}
.banner-content::after{content:'';position:absolute;top:50%;right:-50px;width:300px;height:300px;border:1px solid rgba(231,76,60,.1);border-radius:50%;transform:translateY(-50%);}
.banner-title{font-size:50px;font-weight:900;color:#fff;line-height:1.1;margin-bottom:20px;letter-spacing:-1px;text-transform:uppercase;position:relative;z-index:2;}
.banner-title .highlight{color:var(--accent);position:relative;}
.banner-title .highlight::after{content:'';position:absolute;left:0;right:0;bottom:-4px;height:3px;background:var(--accent);}
.banner-subtitle{font-size:17px;color:rgba(255,255,255,.8);margin-bottom:36px;letter-spacing:.5px;position:relative;z-index:2;}
.banner-tags{display:flex;flex-wrap:wrap;gap:10px;margin-bottom:40px;position:relative;z-index:2;}
.banner-tag{padding:7px 16px;background:rgba(231,76,60,.15);border:1px solid var(--accent);color:#fff;font-size:13px;letter-spacing:.5px;text-transform:uppercase;font-weight:600;}
.banner-actions{display:flex;gap:16px;flex-wrap:wrap;position:relative;z-index:2;}
.btn-primary{display:inline-flex;align-items:center;gap:8px;background:var(--accent);color:#fff;padding:14px 32px;font-size:15px;font-weight:700;letter-spacing:1px;text-transform:uppercase;transition:all .3s;border:2px solid var(--accent);}
.btn-primary:hover{background:var(--accent-dark);border-color:var(--accent-dark);transform:translateY(-2px);}
.btn-outline{display:inline-flex;align-items:center;gap:8px;border:2px solid #fff;color:#fff;padding:12px 30px;font-size:15px;font-weight:700;letter-spacing:1px;text-transform:uppercase;transition:all .3s;}
.btn-outline:hover{background:#fff;color:var(--primary);}
.stats-bar{background:#1a252f;padding:30px 0;}
.stats-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:20px;text-align:center;}
.stat-item{padding:0 20px;border-right:1px solid rgba(255,255,255,.1);}
.stat-item:last-child{border-right:none;}
.stat-num{font-size:38px;font-weight:900;color:var(--accent);line-height:1;letter-spacing:-1px;}
.stat-num span{font-size:18px;color:rgba(255,255,255,.5);}
.stat-label{font-size:13px;color:rgba(255,255,255,.7);margin-top:8px;letter-spacing:1.5px;text-transform:uppercase;}
.advantages-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:16px;}
.advantage-card{background:#fff;border-top:3px solid var(--accent);border-radius:0;padding:30px 24px;transition:all .3s;position:relative;}
.advantage-card::after{content:'';position:absolute;left:0;bottom:0;width:0;height:3px;background:var(--primary);transition:width .3s;}
.advantage-card:hover::after{width:100%;}
.advantage-card:hover{box-shadow:var(--shadow-hover);transform:translateY(-3px);}
.advantage-icon{width:56px;height:56px;margin:0 0 18px;background:var(--primary);color:var(--accent);display:flex;align-items:center;justify-content:center;font-size:24px;font-weight:900;}
.advantage-card h3{font-size:16px;font-weight:800;color:var(--primary);margin-bottom:10px;letter-spacing:.5px;text-transform:uppercase;}
.advantage-card p{font-size:13px;color:var(--text-light);line-height:1.6;}
.services-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:20px;}
.service-card{background:#fff;border-radius:0;overflow:hidden;border:1px solid var(--border);transition:all .3s;}
.service-card:hover{box-shadow:var(--shadow-hover);transform:translateY(-3px);border-color:var(--accent);}
.service-img{height:200px;background:linear-gradient(135deg,#2c3e50,#34495e);position:relative;}
.service-img::before{content:'';position:absolute;top:0;left:0;right:0;height:3px;background:var(--accent);}
.service-img .icon{position:absolute;top:50%;left:50%;transform:translate(-50%,-50%);font-size:54px;opacity:.9;}
.service-body{padding:24px;}
.service-body h3{font-size:17px;font-weight:800;color:var(--primary);margin-bottom:8px;text-transform:uppercase;letter-spacing:.5px;}
.service-body p{font-size:14px;color:var(--text-light);line-height:1.6;}
.industries-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:16px;}
.industry-card{background:#fff;border-left:3px solid var(--accent);padding:24px 20px;transition:all .3s;}
.industry-card:hover{box-shadow:var(--shadow);background:var(--bg-alt);}
.industry-icon{font-size:32px;margin-bottom:10px;}
.industry-card h4{font-size:15px;font-weight:800;color:var(--primary);margin-bottom:6px;text-transform:uppercase;letter-spacing:.5px;}
.industry-card p{font-size:13px;color:var(--text-light);line-height:1.6;}
.cases-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:24px;}
.case-card{background:#fff;border-radius:0;overflow:hidden;box-shadow:var(--shadow);transition:all .3s;}
.case-card:hover{box-shadow:var(--shadow-hover);transform:translateY(-3px);}
.case-img-wrap{overflow:hidden;aspect-ratio:4/3;background:var(--bg-alt);}
.case-img-wrap img{width:100%;height:100%;object-fit:cover;transition:transform .4s;}
.case-card:hover .case-img-wrap img{transform:scale(1.05);}
.case-body{padding:20px;}
.case-body h3{font-size:16px;font-weight:800;color:var(--primary);margin-bottom:6px;text-transform:uppercase;letter-spacing:.5px;}
.case-body p{font-size:13px;color:var(--text-light);line-height:1.6;}
.process-grid{display:grid;grid-template-columns:repeat(6,1fr);gap:0;border:1px solid var(--border);}
.process-step{background:#fff;padding:28px 16px;text-align:center;position:relative;transition:all .3s;border-right:1px solid var(--border);}
.process-step:last-child{border-right:none;}
.process-step:hover{background:var(--bg-alt);}
.process-step::after{content:'';position:absolute;right:-1px;top:0;bottom:0;width:0;background:var(--accent);transition:width .3s;z-index:1;}
.process-step:hover::after{width:3px;}
.process-num{width:42px;height:42px;margin:0 auto 12px;background:var(--primary);color:var(--accent);border-radius:0;display:flex;align-items:center;justify-content:center;font-size:18px;font-weight:900;}
.process-step h4{font-size:14px;font-weight:800;color:var(--primary);margin-bottom:4px;text-transform:uppercase;letter-spacing:.5px;}
.process-step p{font-size:12px;color:var(--text-light);}
.qualification-wrap{background:#fff;border:1px solid var(--border);padding:50px 40px;display:grid;grid-template-columns:1fr 1.4fr;gap:50px;align-items:center;}
.qualification-img{background:var(--bg-alt);padding:20px;}
.qualification-img img{width:100%;height:auto;}
.qualification-content h3{font-size:26px;font-weight:900;color:var(--primary);margin-bottom:14px;text-transform:uppercase;letter-spacing:.5px;}
.qualification-content > p{font-size:15px;color:var(--text-light);line-height:1.85;margin-bottom:24px;}
.qual-list{list-style:none;display:grid;grid-template-columns:1fr 1fr;gap:10px;}
.qual-list li{display:flex;align-items:center;gap:10px;font-size:14px;color:var(--primary);font-weight:600;padding:8px;background:var(--bg-alt);}
.qual-list li::before{content:'■';color:var(--accent);font-size:10px;flex-shrink:0;}
.faq-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:0;border:1px solid var(--border);}
.faq-item{background:#fff;border-bottom:1px solid var(--border);border-right:1px solid var(--border);overflow:hidden;transition:all .3s;}
.faq-item:nth-child(2n){border-right:none;}
.faq-item:hover{background:var(--bg-alt);}
.faq-q{padding:18px 22px;font-size:15px;font-weight:700;color:var(--primary);cursor:pointer;display:flex;align-items:center;justify-content:space-between;gap:12px;letter-spacing:.3px;}
.faq-q .q-icon{flex-shrink:0;width:24px;height:24px;background:var(--primary);color:var(--accent);display:flex;align-items:center;justify-content:center;font-size:14px;font-weight:900;transition:transform .3s;}
.faq-item.active .q-icon{transform:rotate(45deg);}
.faq-a{max-height:0;overflow:hidden;transition:max-height .3s ease,padding .3s ease;padding:0 22px;font-size:14px;color:var(--text-light);line-height:1.7;}
.faq-item.active .faq-a{max-height:300px;padding:0 22px 18px;}
.about-grid{display:grid;grid-template-columns:1fr 1.2fr;gap:50px;align-items:center;}
.about-img{background:var(--bg-alt);}
.about-img img{width:100%;height:auto;}
.about-content h2{font-size:30px;font-weight:900;color:var(--primary);margin-bottom:18px;text-transform:uppercase;letter-spacing:.5px;}
.about-content p{font-size:15px;color:var(--text-light);line-height:1.85;margin-bottom:14px;}
.about-features{display:grid;grid-template-columns:1fr 1fr;gap:10px;margin-top:24px;}
.about-feature{display:flex;align-items:center;gap:10px;font-size:14px;color:var(--primary);font-weight:700;padding:10px 14px;background:var(--bg-alt);border-left:3px solid var(--accent);}
.contact-grid{display:grid;grid-template-columns:1.5fr 1fr;gap:30px;}
.contact-info{background:#fff;border:1px solid var(--border);padding:36px;}
.contact-info h3{font-size:22px;font-weight:900;color:var(--primary);margin-bottom:24px;text-transform:uppercase;letter-spacing:.5px;}
.contact-list{list-style:none;}
.contact-list li{display:flex;align-items:flex-start;gap:14px;padding:12px 0;border-bottom:1px solid var(--border);}
.contact-list li:last-child{border-bottom:none;}
.contact-icon{flex-shrink:0;width:36px;height:36px;background:var(--primary);color:var(--accent);display:flex;align-items:center;justify-content:center;font-size:16px;font-weight:900;}
.contact-detail .label{font-size:12px;color:var(--text-light);margin-bottom:2px;text-transform:uppercase;letter-spacing:1px;}
.contact-detail .value{font-size:15px;font-weight:700;color:var(--primary);}
.contact-detail .value a{color:var(--accent);}
.qr-codes{display:grid;grid-template-columns:1fr 1fr;gap:16px;}
.qr-card{background:#fff;border:1px solid var(--border);padding:20px;text-align:center;}
.qr-card img{width:130px;height:130px;object-fit:cover;margin:0 auto 10px;}
.qr-card p{font-size:13px;font-weight:800;color:var(--primary);text-transform:uppercase;letter-spacing:.5px;}
.menu-toggle{display:none;background:none;border:none;cursor:pointer;}
.menu-toggle span{display:block;width:24px;height:2px;background:#fff;margin:5px 0;}
@media(max-width:1024px){.advantages-grid,.cases-grid,.services-grid{grid-template-columns:repeat(2,1fr);}.industries-grid{grid-template-columns:repeat(2,1fr);}.process-grid{grid-template-columns:repeat(3,1fr);border:none;}.process-step{border:1px solid var(--border);}.process-step::after{display:none;}.about-grid{grid-template-columns:1fr;}.qualification-wrap{grid-template-columns:1fr;padding:30px 24px;}.contact-grid{grid-template-columns:1fr;}.faq-grid{border:none;}.faq-item{border:1px solid var(--border);margin-bottom:-1px;}.faq-item:nth-child(2n){border-right:1px solid var(--border);}}
@media(max-width:768px){.banner-section{min-height:auto;}.banner-nav{flex-wrap:wrap;}.nav-menu{display:none;width:100%;flex-direction:column;gap:0;padding-top:12px;}.nav-menu.open{display:flex;}.nav-menu li{width:100%;}.nav-menu a{display:block;padding:12px 0;border-bottom:1px solid rgba(255,255,255,.1);}.menu-toggle{display:block;}.banner-title{font-size:30px;}.banner-content{padding:40px 0 50px;}.banner-content::before,.banner-content::after{display:none;}.stats-grid{grid-template-columns:repeat(2,1fr);gap:20px;}.stat-item:nth-child(2){border-right:none;}.section{padding:50px 0;}.section-title{font-size:24px;}.cases-grid,.services-grid,.advantages-grid,.industries-grid,.faq-grid{grid-template-columns:1fr;}.process-grid{grid-template-columns:repeat(2,1fr);}.qual-list,.about-features{grid-template-columns:1fr;}.footer-top{grid-template-columns:1fr;}.banner-actions{flex-direction:column;}.btn-primary,.btn-outline{width:100%;justify-content:center;}}