:root{
  --primary:#1a73e8;        /* 主蓝 */
  --primary-dark:#1559b3;
  --accent:#0a8f5b;         /* 辅助绿 */
  --text:#222;
  --muted:#6b7280;
  --bg:#ffffff;
  --light:#f5f7fa;
  --border:#e6e9ee;
  --maxw:1200px;
}
*{margin:0;padding:0;box-sizing:border-box}
html{scroll-behavior:smooth}
body{font-family:"Segoe UI",Roboto,"Microsoft YaHei",Arial,sans-serif;color:var(--text);background:var(--bg);line-height:1.65;font-size:15px}
a{text-decoration:none;color:inherit}
img{max-width:100%;display:block}
.container{max-width:var(--maxw);margin:0 auto;padding:0 20px}
h1,h2,h3,h4{line-height:1.25}

/* ===== 吸顶导航 ===== */
.site-header{position:sticky;top:0;z-index:1000;background:#fff;border-bottom:1px solid var(--border);box-shadow:0 2px 10px rgba(0,0,0,.04)}
.site-header .inner{display:flex;align-items:center;justify-content:space-between;height:74px}
.logo{display:flex;align-items:center;gap:10px;font-weight:700;font-size:19px;color:var(--primary)}
.logo img{height:42px;width:auto}
.nav{display:flex;gap:30px}
.nav a{font-weight:500;color:var(--text);padding:6px 0;position:relative;transition:.2s}
.nav a:hover,.nav a.active{color:var(--primary)}
.nav a.active::after,.nav a:hover::after{content:"";position:absolute;left:0;right:0;bottom:-25px;height:3px;background:var(--primary)}
.btn-quote{background:var(--primary);color:#fff;padding:10px 22px;border-radius:30px;font-weight:600;white-space:nowrap;transition:.2s}
.btn-quote:hover{background:var(--primary-dark)}

/* ===== 按钮 ===== */
.btn{display:inline-block;padding:12px 26px;border-radius:30px;font-weight:600;transition:.2s;cursor:pointer}
.btn-primary{background:var(--primary);color:#fff}
.btn-primary:hover{background:var(--primary-dark)}
.btn-outline{border:2px solid #fff;color:#fff}
.btn-outline:hover{background:#fff;color:var(--primary)}
.btn-ghost{background:#fff;color:var(--primary);border:1px solid var(--border)}
.btn-ghost:hover{box-shadow:0 6px 16px rgba(0,0,0,.08)}

/* ===== Hero ===== */
.hero{position:relative;min-height:500px;display:flex;align-items:center;justify-content:center;overflow:hidden;color:#fff;text-align:center;background:linear-gradient(rgba(11,28,54,.62),rgba(11,28,54,.62)),url('https://img.qismartbao.com/qzb-image/banner.png') center/cover no-repeat}
.hero h1{font-size:44px;margin-bottom:16px;text-shadow:0 2px 12px rgba(0,0,0,.3)}
.hero p{font-size:18px;opacity:.94;max-width:700px;margin:0 auto 28px}
.hero .cta{display:inline-flex;gap:14px;flex-wrap:wrap;justify-content:center}
/* Hero 轮播 */
.hero-slider{position:absolute;inset:0;z-index:0}
.hero .slide{position:absolute;inset:0;background-size:cover;background-position:center;opacity:0;transition:opacity 1s ease}
.hero .slide.active{opacity:1}
.hero::after{content:"";position:absolute;inset:0;background:linear-gradient(rgba(11,28,54,.55),rgba(11,28,54,.55));z-index:1}
.hero-content{position:relative;z-index:2;max-width:760px;padding:0 20px}
.hero-arrow{position:absolute;top:50%;transform:translateY(-50%);z-index:3;width:46px;height:46px;border:0;border-radius:50%;background:rgba(255,255,255,.25);color:#fff;font-size:22px;cursor:pointer;display:flex;align-items:center;justify-content:center;transition:.2s}
.hero-arrow:hover{background:rgba(255,255,255,.45)}
.hero-arrow.prev{left:20px}
.hero-arrow.next{right:20px}
.hero-dots{position:absolute;bottom:22px;left:50%;transform:translateX(-50%);z-index:3;display:flex;gap:10px}
.hero-dots .dot{width:12px;height:12px;border-radius:50%;background:rgba(255,255,255,.5);cursor:pointer;transition:.2s}
.hero-dots .dot.active{background:#fff;width:28px;border-radius:6px}

/* ===== 通用区块 ===== */
section{padding:74px 0}
.section-title{text-align:center;margin-bottom:44px}
.section-title h2{font-size:30px}
.section-title h2 span{color:var(--primary)}
.section-title p{color:var(--muted);margin-top:10px}
.bg-light{background:var(--light)}

/* ===== 产品网格 ===== */
.grid{display:grid;grid-template-columns:repeat(3,1fr);gap:24px}
.card{background:#fff;border:1px solid var(--border);border-radius:14px;overflow:hidden;transition:.25s;display:flex;flex-direction:column}
.card:hover{box-shadow:0 12px 32px rgba(0,0,0,.09);transform:translateY(-5px)}
.card .thumb{aspect-ratio:1/1;background:var(--light);overflow:hidden}
.card .thumb img{width:100%;height:100%;object-fit:contain;padding:18px}
.card .body{padding:18px;flex:1;display:flex;flex-direction:column}
.card .body h3{font-size:17px;margin-bottom:8px}
.card .body p{color:var(--muted);font-size:14px;flex:1}
.card .body .more{margin-top:14px;color:var(--primary);font-weight:600}

/* ===== 优势卡片 ===== */
.features{display:grid;grid-template-columns:repeat(3,1fr);gap:24px}
.feature{text-align:center;padding:32px 22px;background:#fff;border-radius:14px;border:1px solid var(--border);transition:.25s}
.feature:hover{transform:translateY(-5px);box-shadow:0 12px 32px rgba(0,0,0,.08)}
.feature .ic{width:60px;height:60px;margin:0 auto 14px;border-radius:50%;background:rgba(26,115,232,.1);color:var(--primary);display:flex;align-items:center;justify-content:center;font-size:28px}
.feature h3{font-size:18px;margin-bottom:8px}
.feature p{color:var(--muted);font-size:14px}

/* ===== 数据条 ===== */
.stats{display:flex;justify-content:center;gap:64px;flex-wrap:wrap;text-align:center}
.stat .num{font-size:42px;font-weight:800;color:var(--primary)}
.stat .lab{color:var(--muted);font-size:14px}

/* ===== 关于/双栏 ===== */
.two-col{display:grid;grid-template-columns:1fr 1fr;gap:44px;align-items:center}
.two-col img{border-radius:14px}
.prose p{margin-bottom:14px;color:#374151}
.prose h3{font-size:20px;margin:18px 0 8px;color:var(--primary)}

/* ===== 联系 ===== */
.contact-wrap{display:grid;grid-template-columns:1fr 1fr;gap:44px}
.contact-info .row{display:flex;gap:12px;align-items:flex-start;margin-bottom:16px}
.contact-info .row .ic{color:var(--primary);font-size:20px;line-height:1.5}
.contact-info .row b{display:block}
.form input,.form textarea{width:100%;padding:12px 14px;border:1px solid var(--border);border-radius:9px;margin-bottom:14px;font-size:14px;font-family:inherit;background:#fff}
.form input:focus,.form textarea:focus{outline:none;border-color:var(--primary)}
.form button{background:var(--primary);color:#fff;border:0;padding:12px 28px;border-radius:30px;font-weight:600;cursor:pointer;transition:.2s}
.form button:hover{background:var(--primary-dark)}

/* ===== 产品详情 ===== */
.detail{display:grid;grid-template-columns:1fr 1fr;gap:44px;align-items:start}
.detail .gallery img{border:1px solid var(--border);border-radius:14px;background:var(--light);padding:22px}
.detail h1{font-size:30px;margin-bottom:14px}
.detail .desc{color:var(--muted);margin-bottom:18px}
.detail .actions{display:flex;gap:14px;margin:22px 0;flex-wrap:wrap}
.breadcrumb{font-size:13px;color:var(--muted);margin-bottom:18px}
.breadcrumb a:hover{color:var(--primary)}
.related{margin-top:54px}
.related .grid{margin-top:20px}

/* ===== 新闻/列表 ===== */
.news-list{display:flex;flex-direction:column;gap:22px}
.news-item{display:grid;grid-template-columns:200px 1fr;gap:22px;background:#fff;border:1px solid var(--border);border-radius:14px;overflow:hidden;transition:.25s}
.news-item:hover{box-shadow:0 12px 32px rgba(0,0,0,.08)}
.news-item .thumb{background:var(--light);min-height:140px}
.news-item .body{padding:20px}
.news-item .body .date{color:var(--muted);font-size:13px}
.news-item .body h3{font-size:18px;margin:6px 0 8px}
.news-item .body p{color:var(--muted);font-size:14px}

/* ===== 页脚 ===== */
.site-footer{background:#0f1b2d;color:#cbd5e1;padding:54px 0 26px;margin-top:0}
.site-footer .cols{display:grid;grid-template-columns:2fr 1fr 1fr;gap:34px}
.site-footer h4{color:#fff;margin-bottom:16px;font-size:16px}
.site-footer a{color:#cbd5e1;transition:.2s}
.site-footer a:hover{color:#fff}
.site-footer .foot-social a{display:inline-flex;width:38px;height:38px;align-items:center;justify-content:center;border-radius:50%;background:#1c2b42;margin-right:10px;font-size:18px}
.site-footer .bottom{border-top:1px solid #1e2c40;margin-top:34px;padding-top:18px;text-align:center;font-size:13px;color:#7c8aa0}

/* ===== 右侧悬浮窗 ===== */
.side-bar{position:fixed;right:10px;bottom:25%;z-index:8888;display:flex;flex-direction:column;gap:0}
.sb-li{position:relative;list-style:none}
.sb-bt{display:flex;align-items:center;justify-content:center;width:50px;height:50px;background:#000;color:#fff;border-bottom:1px solid #333;cursor:pointer;text-decoration:none;font-size:20px}
.sb-li:last-child .sb-bt{border-bottom:none}
.sb-bt:hover{background:#333}
.sb-ic{color:#fff;font-size:18px;line-height:1}
.sCon{display:none;position:absolute;right:100%;top:0;white-space:nowrap;background:#000;border:1px solid #333;border-right:none}
.sb-li:hover .sCon{display:flex;align-items:center}
.sCon a{display:flex;align-items:center;height:50px;padding:0 14px;color:#fff;text-decoration:none;font-size:14px}
.sCon a:hover{background:#333}
.sCon .sb-ic{margin-right:8px;font-size:16px}
@media(max-width:960px){
  .side-bar{right:8px;bottom:12px;flex-direction:row;gap:6px}
  .sb-bt{width:44px;height:44px;border-bottom:none;border-right:1px solid #333}
  .sb-li:first-child .sb-bt{border-right:none}
  .sCon{display:none !important}
}

/* ===== 响应式 ===== */
@media(max-width:900px){
  .grid,.features{grid-template-columns:repeat(2,1fr)}
  .two-col,.contact-wrap,.detail{grid-template-columns:1fr}
  .nav{display:none}
  .site-footer .cols{grid-template-columns:1fr}
  .hero h1{font-size:30px}
  .stats{gap:34px}
  .news-item{grid-template-columns:1fr}
}
@media(max-width:560px){
  .grid,.features{grid-template-columns:1fr}
  .hero{padding:90px 18px}
}