/* ===== Reset & Base ===== */
*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth;-webkit-text-size-adjust:100%}
body{
  font-family:"Microsoft YaHei","PingFang SC","Hiragino Sans GB","Helvetica Neue",Arial,sans-serif;
  font-size:16px;line-height:1.8;color:#333;background:#FAF7F2;
  overflow-x:hidden;
}
img{max-width:100%;height:auto;display:block}
a{text-decoration:none;color:inherit;transition:color .3s}
ul,ol{list-style:none}
button{cursor:pointer;border:none;background:none;font-family:inherit}
input,select,textarea{font-family:inherit;font-size:inherit}

:root{
  --primary:#2D4A3E;
  --primary-light:#3D6B5A;
  --accent:#C87941;
  --accent-light:#DDA06A;
  --sand:#E8DDD0;
  --sand-light:#F2EBE0;
  --warm-white:#FAF7F2;
  --text:#333;
  --text-light:#666;
  --text-muted:#999;
  --border:#E0D8CC;
  --shadow:0 4px 24px rgba(45,74,62,.08);
  --shadow-lg:0 12px 40px rgba(45,74,62,.12);
  --radius:8px;
  --radius-lg:16px;
  --container:1200px;
}

.container{max-width:var(--container);margin:0 auto;padding:0 24px}

/* ===== Header ===== */
.header{
  position:fixed;top:0;left:0;right:0;z-index:1000;
  background:rgba(250,247,242,.95);backdrop-filter:blur(12px);
  border-bottom:1px solid transparent;transition:all .3s;
}
.header.scrolled{border-bottom-color:var(--border);box-shadow:var(--shadow)}
.header-inner{display:flex;align-items:center;justify-content:space-between;height:76px}
.logo{display:flex;align-items:center;gap:12px}
.logo-mark{
  width:44px;height:44px;border-radius:10px;
  background:linear-gradient(135deg,var(--primary),var(--primary-light));
  color:#fff;display:flex;align-items:center;justify-content:center;
  font-size:22px;font-weight:700;letter-spacing:-1px;
}
.logo-text{display:flex;flex-direction:column;line-height:1.2}
.logo-text .cn{font-size:18px;font-weight:700;color:var(--primary)}
.logo-text .en{font-size:10px;letter-spacing:2px;color:var(--text-muted);text-transform:uppercase}

.nav{display:flex;gap:4px}
.nav a{
  padding:8px 16px;border-radius:6px;font-size:15px;font-weight:500;
  color:var(--text);transition:all .25s;position:relative;
}
.nav a:hover{color:var(--accent);background:var(--sand-light)}
.nav a.active{color:var(--accent);font-weight:600}
.nav a.active::after{
  content:"";position:absolute;bottom:2px;left:50%;transform:translateX(-50%);
  width:20px;height:3px;border-radius:2px;background:var(--accent);
}

.header-phone{
  display:flex;align-items:center;gap:8px;
  color:var(--primary);font-weight:700;font-size:16px;
  padding:8px 16px;border:2px solid var(--primary);border-radius:30px;
  transition:all .3s;
}
.header-phone:hover{background:var(--primary);color:#fff}
.header-phone svg{width:18px;height:18px}

.mobile-menu-btn{display:none;flex-direction:column;gap:5px;padding:8px}
.mobile-menu-btn span{width:24px;height:2px;background:var(--primary);border-radius:2px;transition:all .3s}

/* ===== Hero ===== */
.hero{
  position:relative;min-height:620px;display:flex;align-items:center;
  background:linear-gradient(135deg,#2D4A3E 0%,#3D6B5A 50%,#4A7B68 100%);
  overflow:hidden;padding-top:76px;
}
.hero::before{
  content:"";position:absolute;inset:0;
  background:
    radial-gradient(circle at 20% 30%,rgba(200,121,65,.15) 0%,transparent 50%),
    radial-gradient(circle at 80% 70%,rgba(232,221,208,.1) 0%,transparent 40%);
}
.hero::after{
  content:"";position:absolute;bottom:0;left:0;right:0;height:120px;
  background:linear-gradient(to top,var(--warm-white),transparent);
}
.hero-content{position:relative;z-index:2;max-width:640px;padding:60px 0}
.hero-eyebrow{
  display:inline-block;padding:6px 18px;border-radius:30px;
  background:rgba(200,121,65,.2);color:var(--accent-light);
  font-size:14px;font-weight:500;margin-bottom:20px;letter-spacing:1px;
}
.hero h1{
  font-size:44px;font-weight:800;color:#fff;line-height:1.3;
  margin-bottom:20px;letter-spacing:-1px;
}
.hero h1 span{color:var(--accent-light)}
.hero p{font-size:17px;color:rgba(255,255,255,.8);margin-bottom:32px;line-height:1.9}
.hero-btns{display:flex;gap:16px;flex-wrap:wrap}
.btn{
  display:inline-flex;align-items:center;gap:8px;
  padding:14px 32px;border-radius:30px;font-size:16px;font-weight:600;
  transition:all .3s;cursor:pointer;border:none;
}
.btn-primary{background:var(--accent);color:#fff;box-shadow:0 4px 20px rgba(200,121,65,.4)}
.btn-primary:hover{background:var(--accent-light);transform:translateY(-2px);box-shadow:0 8px 28px rgba(200,121,65,.5)}
.btn-outline{background:transparent;color:#fff;border:2px solid rgba(255,255,255,.4)}
.btn-outline:hover{border-color:#fff;background:rgba(255,255,255,.1)}

.hero-stats{
  position:relative;z-index:2;display:flex;gap:48px;margin-top:48px;
  padding-top:32px;border-top:1px solid rgba(255,255,255,.15);
}
.hero-stat .num{font-size:36px;font-weight:800;color:var(--accent-light);line-height:1}
.hero-stat .label{font-size:13px;color:rgba(255,255,255,.6);margin-top:6px}

.hero-visual{
  position:absolute;right:5%;top:50%;transform:translateY(-50%);
  z-index:1;width:420px;opacity:.9;
}
.hero-visual img{filter:drop-shadow(0 20px 40px rgba(0,0,0,.3))}

/* ===== Section Common ===== */
.section{padding:80px 0}
.section-alt{background:var(--sand-light)}
.section-title{text-align:center;margin-bottom:56px}
.section-title .eyebrow{
  display:inline-block;font-size:13px;letter-spacing:3px;
  color:var(--accent);font-weight:600;text-transform:uppercase;margin-bottom:12px;
}
.section-title h2{
  font-size:34px;font-weight:800;color:var(--primary);
  margin-bottom:14px;letter-spacing:-.5px;
}
.section-title p{font-size:16px;color:var(--text-light);max-width:600px;margin:0 auto}

/* ===== Page Header (inner pages) ===== */
.page-header{
  background:linear-gradient(135deg,#2D4A3E,#3D6B5A);
  padding:140px 0 60px;position:relative;overflow:hidden;
}
.page-header::before{
  content:"";position:absolute;inset:0;
  background:radial-gradient(circle at 70% 50%,rgba(200,121,65,.12),transparent 50%);
}
.page-header .container{position:relative;z-index:2}
.breadcrumb{font-size:14px;color:rgba(255,255,255,.6);margin-bottom:16px}
.breadcrumb a{color:rgba(255,255,255,.8)}
.breadcrumb a:hover{color:var(--accent-light)}
.breadcrumb .sep{margin:0 8px}
.page-header h1{font-size:38px;font-weight:800;color:#fff;margin-bottom:12px}
.page-header p{font-size:16px;color:rgba(255,255,255,.7);max-width:700px}

/* ===== Products Grid ===== */
.products-grid{
  display:grid;grid-template-columns:repeat(4,1fr);gap:24px;
}
.product-card{
  background:#fff;border-radius:var(--radius-lg);overflow:hidden;
  box-shadow:var(--shadow);transition:all .35s;position:relative;
}
.product-card:hover{transform:translateY(-6px);box-shadow:var(--shadow-lg)}
.product-card-img{
  height:220px;background:var(--sand-light);display:flex;align-items:center;
  justify-content:center;padding:24px;position:relative;overflow:hidden;
}
.product-card-img img{max-height:180px;object-fit:contain;transition:transform .4s}
.product-card:hover .product-card-img img{transform:scale(1.08)}
.product-card-tag{
  position:absolute;top:14px;left:14px;padding:4px 12px;
  background:var(--accent);color:#fff;font-size:12px;font-weight:600;
  border-radius:20px;
}
.product-card-body{padding:20px}
.product-card-body h3{font-size:17px;font-weight:700;color:var(--primary);margin-bottom:8px}
.product-card-body p{font-size:13px;color:var(--text-light);line-height:1.7;margin-bottom:14px}
.product-card-features{display:flex;flex-wrap:wrap;gap:6px;margin-bottom:14px}
.product-card-features span{
  font-size:11px;padding:3px 10px;background:var(--sand-light);
  color:var(--primary-light);border-radius:12px;
}
.product-card-link{
  display:inline-flex;align-items:center;gap:4px;font-size:14px;
  color:var(--accent);font-weight:600;
}
.product-card-link svg{width:14px;height:14px;transition:transform .3s}
.product-card:hover .product-card-link svg{transform:translateX(4px)}

/* ===== Product Detail (products page) ===== */
.product-detail{
  display:grid;grid-template-columns:1fr 1fr;gap:48px;
  align-items:center;margin-bottom:64px;
  background:#fff;border-radius:var(--radius-lg);padding:40px;
  box-shadow:var(--shadow);
}
.product-detail:nth-child(even){direction:rtl}
.product-detail:nth-child(even)>*{direction:ltr}
.product-detail-img{
  background:var(--sand-light);border-radius:var(--radius);
  display:flex;align-items:center;justify-content:center;padding:32px;
  min-height:320px;
}
.product-detail-img img{max-height:280px;object-fit:contain}
.product-detail-info h3{
  font-size:26px;font-weight:800;color:var(--primary);margin-bottom:8px;
}
.product-detail-info .subtitle{
  font-size:14px;color:var(--accent);font-weight:600;margin-bottom:16px;
  letter-spacing:1px;
}
.product-detail-info>p{color:var(--text-light);margin-bottom:20px;line-height:1.9}
.product-specs{display:grid;grid-template-columns:1fr 1fr;gap:12px;margin-bottom:20px}
.product-spec{
  display:flex;align-items:center;gap:8px;font-size:14px;color:var(--text);
}
.product-spec svg{width:18px;height:18px;color:var(--accent);flex-shrink:0}
.product-tags{display:flex;flex-wrap:wrap;gap:8px}
.product-tags span{
  font-size:12px;padding:5px 14px;background:var(--sand-light);
  color:var(--primary-light);border-radius:16px;font-weight:500;
}

/* ===== Category Tabs ===== */
.cat-tabs{display:flex;justify-content:center;gap:8px;margin-bottom:40px;flex-wrap:wrap}
.cat-tab{
  padding:10px 24px;border-radius:30px;font-size:15px;font-weight:500;
  color:var(--text-light);background:#fff;border:1px solid var(--border);
  transition:all .3s;
}
.cat-tab:hover,.cat-tab.active{background:var(--primary);color:#fff;border-color:var(--primary)}

/* ===== Advantages ===== */
.advantages-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:24px}
.advantage-item{
  background:#fff;border-radius:var(--radius-lg);padding:32px 24px;
  text-align:center;box-shadow:var(--shadow);transition:all .35s;
}
.advantage-item:hover{transform:translateY(-4px);box-shadow:var(--shadow-lg)}
.advantage-icon{
  width:64px;height:64px;margin:0 auto 20px;border-radius:50%;
  background:linear-gradient(135deg,var(--primary),var(--primary-light));
  display:flex;align-items:center;justify-content:center;
}
.advantage-icon svg{width:30px;height:30px;color:#fff}
.advantage-item h3{font-size:18px;font-weight:700;color:var(--primary);margin-bottom:10px}
.advantage-item p{font-size:14px;color:var(--text-light);line-height:1.8}

/* ===== Scenarios ===== */
.scenarios-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:24px}
.scenario-card{
  position:relative;border-radius:var(--radius-lg);overflow:hidden;
  height:280px;cursor:pointer;
}
.scenario-card img{width:100%;height:100%;object-fit:cover;transition:transform .5s}
.scenario-card:hover img{transform:scale(1.08)}
.scenario-overlay{
  position:absolute;inset:0;
  background:linear-gradient(to top,rgba(45,74,62,.9) 0%,transparent 60%);
  display:flex;flex-direction:column;justify-content:flex-end;padding:28px;
}
.scenario-overlay h3{font-size:20px;font-weight:700;color:#fff;margin-bottom:6px}
.scenario-overlay p{font-size:13px;color:rgba(255,255,255,.75)}

/* ===== Cases ===== */
.cases-filter{display:flex;justify-content:center;gap:8px;margin-bottom:40px;flex-wrap:wrap}
.cases-filter button{
  padding:8px 20px;border-radius:20px;font-size:14px;font-weight:500;
  color:var(--text-light);background:#fff;border:1px solid var(--border);
  transition:all .3s;
}
.cases-filter button:hover,.cases-filter button.active{
  background:var(--accent);color:#fff;border-color:var(--accent);
}
.cases-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:24px}
.case-card{
  background:#fff;border-radius:var(--radius-lg);overflow:hidden;
  box-shadow:var(--shadow);transition:all .35s;
}
.case-card:hover{transform:translateY(-4px);box-shadow:var(--shadow-lg)}
.case-card-img{position:relative;height:200px;overflow:hidden;background:var(--sand-light)}
.case-card-img img{width:100%;height:100%;object-fit:cover;transition:transform .5s}
.case-card:hover .case-card-img img{transform:scale(1.06)}
.case-type{
  position:absolute;top:14px;left:14px;padding:4px 14px;
  background:var(--accent);color:#fff;font-size:12px;font-weight:600;border-radius:20px;
}
.case-card-body{padding:22px}
.case-card-body h3{font-size:17px;font-weight:700;color:var(--primary);margin-bottom:10px}
.case-meta{display:flex;gap:8px;margin-bottom:12px;flex-wrap:wrap}
.case-meta span{
  font-size:11px;padding:3px 10px;background:var(--sand-light);
  color:var(--primary-light);border-radius:12px;
}
.case-card-body p{font-size:13px;color:var(--text-light);line-height:1.7}

/* ===== Construction Steps ===== */
.steps-timeline{position:relative;max-width:900px;margin:0 auto}
.steps-timeline::before{
  content:"";position:absolute;left:50%;top:0;bottom:0;width:3px;
  background:linear-gradient(to bottom,var(--accent),var(--primary));
  transform:translateX(-50%);border-radius:2px;
}
.step-item{
  display:grid;grid-template-columns:1fr 60px 1fr;gap:0;
  margin-bottom:40px;align-items:center;position:relative;
}
.step-item:nth-child(odd) .step-content{text-align:right;padding-right:32px}
.step-item:nth-child(even) .step-content{grid-column:3;text-align:left;padding-left:32px}
.step-dot{
  grid-column:2;width:48px;height:48px;border-radius:50%;
  background:var(--accent);color:#fff;display:flex;align-items:center;
  justify-content:center;font-size:18px;font-weight:800;
  box-shadow:0 0 0 6px var(--warm-white),0 4px 16px rgba(200,121,65,.4);
  z-index:2;justify-self:center;
}
.step-content{background:#fff;border-radius:var(--radius);padding:24px;box-shadow:var(--shadow)}
.step-content h4{font-size:18px;font-weight:700;color:var(--primary);margin-bottom:8px}
.step-content p{font-size:14px;color:var(--text-light);line-height:1.8}

/* ===== News ===== */
.news-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:24px}
.news-card{
  background:#fff;border-radius:var(--radius-lg);overflow:hidden;
  box-shadow:var(--shadow);transition:all .35s;display:flex;flex-direction:column;
}
.news-card:hover{transform:translateY(-4px);box-shadow:var(--shadow-lg)}
.news-card-img{
  height:180px;background:linear-gradient(135deg,var(--primary),var(--primary-light));
  display:flex;align-items:center;justify-content:center;position:relative;
}
.news-icon{width:60px;height:60px;opacity:.6}
.news-card-body{padding:22px;flex:1;display:flex;flex-direction:column}
.news-card-body .date{
  display:flex;align-items:center;gap:6px;font-size:12px;
  color:var(--accent);font-weight:600;margin-bottom:10px;
}
.news-card-body h3{
  font-size:17px;font-weight:700;color:var(--primary);margin-bottom:10px;
  line-height:1.5;flex:1;
}
.news-card-body p{font-size:13px;color:var(--text-light);line-height:1.7;margin-bottom:16px}
.read-more{
  display:inline-flex;align-items:center;gap:6px;font-size:14px;
  color:var(--accent);font-weight:600;margin-top:auto;
}
.read-more svg{width:14px;height:14px;transition:transform .3s}
.news-card:hover .read-more svg{transform:translateX(4px)}

/* ===== About ===== */
.about-hero{display:grid;grid-template-columns:1fr 1fr;gap:48px;align-items:center}
.about-hero-img{
  border-radius:var(--radius-lg);overflow:hidden;box-shadow:var(--shadow-lg);
  height:400px;background:var(--sand-light);display:flex;align-items:center;justify-content:center;
}
.about-hero-img img{max-height:340px;object-fit:contain}
.about-text h2{font-size:30px;font-weight:800;color:var(--primary);margin-bottom:20px}
.about-text p{color:var(--text-light);margin-bottom:16px;line-height:1.9}
.highlight-box{
  background:linear-gradient(135deg,var(--primary),var(--primary-light));
  color:#fff;padding:20px 24px;border-radius:var(--radius);margin-top:20px;
  font-size:15px;font-weight:500;line-height:1.8;
}

.timeline-section{background:var(--sand-light)}
.timeline{display:grid;grid-template-columns:repeat(4,1fr);gap:24px;margin-top:40px}
.timeline-item{
  background:#fff;border-radius:var(--radius);padding:28px 24px;
  border-top:4px solid var(--accent);box-shadow:var(--shadow);
}
.timeline-item .year{
  font-size:14px;font-weight:700;color:var(--accent);margin-bottom:8px;
  letter-spacing:1px;
}
.timeline-item h4{font-size:17px;font-weight:700;color:var(--primary);margin-bottom:8px}
.timeline-item p{font-size:13px;color:var(--text-light);line-height:1.7}

.cert-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:24px}
.cert-item{
  background:#fff;border-radius:var(--radius);padding:28px 20px;
  text-align:center;box-shadow:var(--shadow);transition:all .3s;
}
.cert-item:hover{transform:translateY(-4px)}
.cert-icon{
  width:56px;height:56px;margin:0 auto 14px;border-radius:50%;
  background:var(--sand-light);display:flex;align-items:center;justify-content:center;
}
.cert-icon svg{width:28px;height:28px;color:var(--accent)}
.cert-item h4{font-size:16px;font-weight:700;color:var(--primary);margin-bottom:4px}
.cert-item p{font-size:12px;color:var(--text-muted)}

/* ===== Contact ===== */
.contact-grid{display:grid;grid-template-columns:1fr 1fr;gap:48px}
.contact-info h2{font-size:28px;font-weight:800;color:var(--primary);margin-bottom:16px}
.contact-info>p{color:var(--text-light);margin-bottom:32px;line-height:1.9}
.contact-item{
  display:flex;gap:16px;margin-bottom:24px;align-items:flex-start;
}
.ci-icon{
  width:48px;height:48px;border-radius:12px;background:var(--sand-light);
  display:flex;align-items:center;justify-content:center;flex-shrink:0;
}
.ci-icon svg{width:22px;height:22px;color:var(--accent)}
.ci-text h4{font-size:15px;font-weight:700;color:var(--primary);margin-bottom:4px}
.ci-text p{font-size:14px;color:var(--text-light);line-height:1.7}
.ci-text a:hover{color:var(--accent)}

.wechat-section{
  margin-top:32px;padding:24px;background:var(--sand-light);
  border-radius:var(--radius);text-align:center;
}
.wechat-section h4{font-size:16px;font-weight:700;color:var(--primary);margin-bottom:16px}
.wechat-qr{
  width:160px;height:160px;margin:0 auto 12px;background:#fff;
  border-radius:var(--radius);padding:10px;box-shadow:var(--shadow);
}
.wechat-qr img{width:100%;height:100%;object-fit:contain}
.wechat-section p{font-size:13px;color:var(--text-light)}

.contact-form-wrap{
  background:#fff;border-radius:var(--radius-lg);padding:36px;
  box-shadow:var(--shadow);
}
.contact-form-wrap h3{font-size:22px;font-weight:800;color:var(--primary);margin-bottom:8px}
.form-sub{font-size:14px;color:var(--text-light);margin-bottom:24px}
.form-row{display:grid;grid-template-columns:1fr 1fr;gap:16px}
.form-group{margin-bottom:18px}
.form-group label{
  display:block;font-size:14px;font-weight:600;color:var(--primary);margin-bottom:6px;
}
.form-group .req{color:var(--accent)}
.form-group input,.form-group select,.form-group textarea{
  width:100%;padding:12px 16px;border:1px solid var(--border);border-radius:8px;
  font-size:14px;color:var(--text);background:var(--warm-white);
  transition:all .3s;outline:none;
}
.form-group input:focus,.form-group select:focus,.form-group textarea:focus{
  border-color:var(--accent);box-shadow:0 0 0 3px rgba(200,121,65,.1);
}
.form-group textarea{resize:vertical;min-height:100px}
.form-submit{
  width:100%;padding:14px;background:var(--accent);color:#fff;
  border-radius:8px;font-size:16px;font-weight:600;
  display:flex;align-items:center;justify-content:center;gap:8px;
  transition:all .3s;
}
.form-submit:hover{background:var(--accent-light)}

/* ===== CTA Band ===== */
.cta-band{
  background:linear-gradient(135deg,var(--primary),var(--primary-light));
  padding:48px 0;position:relative;overflow:hidden;
}
.cta-band::before{
  content:"";position:absolute;inset:0;
  background:radial-gradient(circle at 80% 50%,rgba(200,121,65,.2),transparent 50%);
}
.cta-band-inner{
  display:flex;align-items:center;justify-content:space-between;
  position:relative;z-index:2;flex-wrap:wrap;gap:24px;
}
.cta-band-text h2{font-size:26px;font-weight:800;color:#fff;margin-bottom:6px}
.cta-band-text p{font-size:15px;color:rgba(255,255,255,.7)}
.cta-band-phone .phone-num{font-size:30px;font-weight:800;color:var(--accent-light)}

/* ===== Footer ===== */
.footer{background:#1E332B;color:rgba(255,255,255,.7);padding-top:60px}
.footer-grid{display:grid;grid-template-columns:2fr 1fr 1fr 1.5fr;gap:40px;padding-bottom:40px}
.footer-brand .logo{margin-bottom:16px}
.footer-brand .logo-text .cn{color:#fff;font-size:16px}
.footer-brand .logo-text .en{color:rgba(255,255,255,.4)}
.footer-brand p{font-size:13px;line-height:1.9;color:rgba(255,255,255,.55)}
.footer-col h4{
  font-size:15px;font-weight:700;color:#fff;margin-bottom:18px;
  padding-bottom:10px;border-bottom:2px solid var(--accent);display:inline-block;
}
.footer-col ul li{margin-bottom:10px}
.footer-col ul li a{font-size:13px;color:rgba(255,255,255,.55);transition:color .3s}
.footer-col ul li a:hover{color:var(--accent-light)}
.footer-contact-item{
  display:flex;gap:10px;margin-bottom:14px;font-size:13px;
  color:rgba(255,255,255,.6);line-height:1.7;
}
.footer-contact-item svg{width:18px;height:18px;color:var(--accent);flex-shrink:0;margin-top:2px}
.footer-bottom{
  border-top:1px solid rgba(255,255,255,.1);padding:20px 0;
  font-size:12px;color:rgba(255,255,255,.4);text-align:center;line-height:1.8;
}
.footer-bottom a{color:rgba(255,255,255,.5)}
.footer-bottom a:hover{color:var(--accent-light)}

/* ===== Floating Contact ===== */
.floating-contact{
  position:fixed;right:20px;bottom:100px;z-index:999;
  display:flex;flex-direction:column;gap:10px;
}
.fc-btn{
  width:52px;height:52px;border-radius:50%;background:#fff;
  box-shadow:var(--shadow-lg);display:flex;align-items:center;justify-content:center;
  position:relative;transition:all .3s;cursor:pointer;
}
.fc-btn:hover{background:var(--accent);transform:scale(1.08)}
.fc-btn:hover svg{color:#fff}
.fc-btn svg{width:24px;height:24px;color:var(--primary);transition:color .3s}
.fc-btn.phone{background:var(--accent)}
.fc-btn.phone svg{color:#fff}
.fc-btn.phone:hover{background:var(--accent-light)}
.fc-btn .tooltip{
  position:absolute;right:64px;top:50%;transform:translateY(-50%);
  background:var(--primary);color:#fff;padding:6px 14px;border-radius:6px;
  font-size:13px;white-space:nowrap;opacity:0;pointer-events:none;
  transition:all .3s;
}
.fc-btn:hover .tooltip{opacity:1;right:60px}
.fc-wechat-popup{
  position:absolute;right:64px;bottom:0;background:#fff;border-radius:12px;
  padding:12px;box-shadow:var(--shadow-lg);opacity:0;pointer-events:none;
  transition:all .3s;width:140px;text-align:center;
}
.fc-btn.wechat:hover .fc-wechat-popup{opacity:1;pointer-events:auto;right:60px}
.fc-wechat-popup img{width:116px;height:116px;object-fit:contain;margin:0 auto}
.fc-wechat-popup p{font-size:11px;color:var(--text-light);margin-top:6px}

/* ===== Back to Top ===== */
.back-top{
  position:fixed;right:20px;bottom:24px;z-index:999;width:48px;height:48px;
  border-radius:50%;background:var(--primary);color:#fff;
  display:flex;align-items:center;justify-content:center;
  box-shadow:var(--shadow-lg);opacity:0;pointer-events:none;transition:all .3s;
}
.back-top.show{opacity:1;pointer-events:auto}
.back-top:hover{background:var(--accent)}
.back-top svg{width:22px;height:22px}

/* ===== Responsive ===== */
@media(max-width:1024px){
  .products-grid{grid-template-columns:repeat(3,1fr)}
  .advantages-grid{grid-template-columns:repeat(2,1fr)}
  .footer-grid{grid-template-columns:1fr 1fr}
  .hero-visual{display:none}
}
@media(max-width:768px){
  .nav{
    position:fixed;top:76px;left:0;right:0;background:#fff;
    flex-direction:column;padding:20px;gap:4px;
    box-shadow:var(--shadow-lg);transform:translateY(-120%);transition:transform .3s;
  }
  .nav.open{transform:translateY(0)}
  .nav a{padding:12px 16px}
  .mobile-menu-btn{display:flex}
  .header-phone{display:none}
  .hero h1{font-size:30px}
  .hero{min-height:520px}
  .hero-stats{gap:24px}
  .hero-stat .num{font-size:28px}
  .section{padding:56px 0}
  .section-title h2{font-size:26px}
  .products-grid{grid-template-columns:repeat(2,1fr);gap:16px}
  .product-detail{grid-template-columns:1fr;padding:24px;gap:24px}
  .product-detail:nth-child(even){direction:ltr}
  .cases-grid,.news-grid,.scenarios-grid{grid-template-columns:1fr}
  .advantages-grid{grid-template-columns:1fr}
  .timeline{grid-template-columns:1fr}
  .cert-grid{grid-template-columns:repeat(2,1fr)}
  .about-hero{grid-template-columns:1fr}
  .contact-grid{grid-template-columns:1fr}
  .form-row{grid-template-columns:1fr}
  .footer-grid{grid-template-columns:1fr;gap:28px}
  .page-header h1{font-size:28px}
  .steps-timeline::before{left:24px}
  .step-item{grid-template-columns:48px 1fr;gap:16px}
  .step-item:nth-child(odd) .step-content,
  .step-item:nth-child(even) .step-content{
    grid-column:2;text-align:left;padding-left:0;padding-right:0;
  }
  .step-dot{grid-column:1;width:40px;height:40px;font-size:15px}
  .cta-band-inner{flex-direction:column;text-align:center}
}
@media(max-width:480px){
  .products-grid{grid-template-columns:1fr}
  .cert-grid{grid-template-columns:1fr}
  .hero-btns{flex-direction:column}
  .btn{width:100%;justify-content:center}
}