/* 山东广鑫新型材料有限公司 官网样式 */
:root{
  --red:#E10A17;
  --red-dark:#b70812;
  --dark:#1c1d20;
  --gray:#f5f6f8;
  --line:#e8e9ec;
  --text:#3a3d42;
  --muted:#8a8f96;
}
*{margin:0;padding:0;box-sizing:border-box}
html{scroll-behavior:smooth}
body{font-family:"Microsoft YaHei","PingFang SC","Segoe UI",sans-serif;color:var(--text);background:#fff;line-height:1.75;font-size:15.5px}
img{max-width:100%;display:block}
a{color:inherit;text-decoration:none}
ul{list-style:none}
.container{max-width:1200px;margin:0 auto;padding:0 20px}

/* ---------- 顶部导航（白色，含电话） ---------- */
.header{position:sticky;top:0;z-index:100;background:#fff;box-shadow:0 1px 0 var(--line),0 6px 24px rgba(20,22,26,.05)}
.nav{display:flex;align-items:center;gap:28px;height:78px}
.logo{flex:0 0 auto;display:flex;align-items:center}
.logo img{height:46px;width:auto}
.nav-list{display:flex;align-items:center;gap:6px;margin-left:auto}
.nav-list>li{position:relative}
.nav-list>li>a{display:block;padding:10px 16px;font-size:16px;color:var(--dark);font-weight:600;border-radius:4px;transition:.2s}
.nav-list>li>a:hover{color:var(--red)}
.nav-list>li>a.active{color:var(--red)}
.nav-list>li>a.active::after{content:"";position:absolute;left:16px;right:16px;bottom:2px;height:2px;background:var(--red)}
.dropdown{position:absolute;top:100%;left:8px;min-width:190px;background:#fff;border:1px solid var(--line);border-radius:6px;box-shadow:0 12px 30px rgba(0,0,0,.1);padding:8px 0;opacity:0;visibility:hidden;transform:translateY(8px);transition:.22s}
.nav-list>li:hover .dropdown{opacity:1;visibility:visible;transform:translateY(0)}
.dropdown a{display:block;padding:9px 18px;font-size:14.5px;color:var(--text)}
.dropdown a:hover{background:var(--gray);color:var(--red)}
.nav-phone{flex:0 0 auto;text-align:right;line-height:1.3;border-left:1px solid var(--line);padding-left:22px;margin-left:6px}
.nav-phone small{display:block;font-size:12px;color:var(--muted);letter-spacing:2px}
.nav-phone a{font-size:19px;font-weight:800;color:var(--red);font-family:"Arial",sans-serif;display:inline-flex;align-items:center;gap:7px}
.nav-phone a i.ph{display:inline-flex;width:17px;height:17px}
.nav-phone a i.ph svg{width:100%;height:100%}
.nav-cta{background:var(--red)!important;color:#fff!important;padding:10px 22px!important;border-radius:999px!important}
.nav-cta:hover{background:var(--red-dark)!important;color:#fff!important}
.nav-cta.active::after{display:none}
.burger{display:none;margin-left:auto;background:none;border:0;color:var(--dark);cursor:pointer;padding:4px;line-height:0}

/* ---------- Banner ---------- */
.banner{position:relative;height:78vh;min-height:520px;max-height:820px;overflow:hidden;background:var(--dark)}
.banner .slide{position:absolute;inset:0;background-size:cover;background-position:center;opacity:0;transition:opacity 1s;display:flex;align-items:center}
.banner .slide.on{opacity:1}
.banner .slide::before{content:"";position:absolute;inset:0;background:linear-gradient(90deg,rgba(12,13,16,.72) 0%,rgba(12,13,16,.38) 55%,rgba(12,13,16,.12) 100%)}
.banner .caption{position:relative;max-width:1200px;margin:0 auto;padding:0 20px;width:100%}
.banner .tag{display:inline-block;background:var(--red);color:#fff;font-size:14px;letter-spacing:3px;padding:6px 16px;border-radius:3px;margin-bottom:20px}
.banner h2{color:#fff;font-size:44px;line-height:1.35;font-weight:800;text-shadow:0 2px 18px rgba(0,0,0,.35)}
.banner p{color:rgba(255,255,255,.88);font-size:17px;max-width:640px;margin:18px 0 30px;text-shadow:0 1px 8px rgba(0,0,0,.4)}
.banner-dots{position:absolute;left:0;right:0;bottom:26px;display:flex;justify-content:center;gap:10px;z-index:5}
.banner-dots span{width:34px;height:4px;background:rgba(255,255,255,.4);border-radius:2px;cursor:pointer;transition:.3s}
.banner-dots span.on{background:var(--red)}

/* ---------- 按钮 ---------- */
.btn{display:inline-block;padding:13px 34px;border-radius:4px;font-size:16px;font-weight:700;transition:.2s}
.btn-red{background:var(--red);color:#fff}
.btn-red:hover{background:var(--red-dark)}
.btn-ghost{border:1.5px solid rgba(255,255,255,.75);color:#fff;margin-left:14px}
.btn-ghost:hover{background:#fff;color:var(--dark)}

/* ---------- 通用板块 ---------- */
.section{padding:88px 0}
.section.gray{background:var(--gray)}
.sec-head{text-align:center;margin-bottom:52px}
.sec-head.left{text-align:left}
.sec-head .en{font-size:13px;letter-spacing:5px;color:var(--red);font-weight:700;text-transform:uppercase;font-family:Arial,sans-serif}
.sec-head h2{font-size:34px;color:var(--dark);margin:10px 0 8px;font-weight:800}
.sec-head .sub{color:var(--muted);font-size:15.5px}
.sec-head .bar{width:52px;height:3px;background:var(--red);margin:18px auto 0}
.sec-head.left .bar{margin-left:0}
.more-link{color:var(--red);font-weight:700}

/* ---------- 首页产品卡（统一 3:4） ---------- */
.prod-grid{display:grid;grid-template-columns:repeat(5,1fr);gap:18px}
.prod-card{background:#fff;border:1px solid var(--line);border-radius:8px;overflow:hidden;transition:.25s;display:block}
.prod-card:hover{transform:translateY(-6px);box-shadow:0 18px 40px rgba(0,0,0,.12);border-color:transparent}
.prod-card .imgwrap{aspect-ratio:3/4;overflow:hidden}
.prod-card img{width:100%;height:100%;object-fit:cover;transition:transform .5s}
.prod-card:hover img{transform:scale(1.05)}
.prod-card .info{padding:16px 14px 18px;text-align:center}
.prod-card h3{font-size:17px;color:var(--dark);font-weight:700}
.prod-card .info p{font-size:12.5px;color:var(--muted);margin-top:5px}

/* ---------- 品牌介绍 ---------- */
.intro{display:grid;grid-template-columns:1.15fr 1fr;gap:56px;align-items:center}
.intro-about{align-items:center}
.intro-about .pic{display:flex;flex-direction:column;gap:18px}
.intro-about .pic img{width:100%;display:block}
.intro-about .pic .badge{bottom:-14px}
.intro .txt p{margin-bottom:16px;text-align:justify}
.intro .pic{position:relative}
.intro .pic img{border-radius:8px;box-shadow:0 20px 50px rgba(0,0,0,.14)}
.intro .badge{position:absolute;left:-16px;bottom:-16px;background:var(--red);color:#fff;padding:14px 22px;font-weight:700;border-radius:6px;box-shadow:0 10px 24px rgba(225,10,23,.3)}
.nums{display:flex;gap:38px;margin-top:26px}
.nums b{font-size:38px;color:var(--red);font-family:Arial,sans-serif}
.nums span{display:block;font-size:13px;color:var(--muted);margin-top:2px}

/* ---------- 发展历程（中轴左右交替时间轴，倒序） ---------- */
.timeline2{position:relative;max-width:980px;margin:0 auto;padding:6px 0 4px}
.timeline2::before{content:"";position:absolute;left:50%;top:0;bottom:0;width:2px;margin-left:-1px;background:rgba(225,10,23,.16)}
.t2{position:relative;display:grid;grid-template-columns:1fr 1fr;padding:4px 0 34px}
.t2 .yr{grid-column:1/3;justify-self:center;position:relative;z-index:1;align-self:start;font-size:32px;font-weight:900;color:var(--red);line-height:1;background:var(--gray);padding:6px 20px}
.t2 .yr .now{display:inline-block;vertical-align:middle;font-size:10.5px;font-weight:800;letter-spacing:2px;color:#fff;background:var(--red);border-radius:20px;padding:3px 10px;margin-left:8px;transform:translateY(-3px)}
.t2 .dot{position:absolute;left:50%;top:52px;width:15px;height:15px;margin-left:-7.5px;border-radius:50%;background:#fff;border:3px solid var(--red);box-shadow:0 0 0 5px rgba(225,10,23,.08);z-index:2}
.t2 .card{grid-row:2;background:#fff;border:1px solid var(--line);border-radius:10px;padding:20px 24px;box-shadow:0 8px 24px rgba(0,0,0,.05);max-width:440px}
.t2:not(.flip) .card{grid-column:2;justify-self:start}
.t2.flip .card{grid-column:1;justify-self:end}
.t2 .card h4{font-size:17.5px;font-weight:800;color:var(--dark);line-height:1.55}
.t2 .card p{font-size:12.5px;color:#b0b0b0;line-height:1.65;margin-top:8px}
@media(max-width:768px){
  .timeline2{padding:0 0 4px}
  .timeline2::before{left:14px;margin-left:0}
  .t2{grid-template-columns:1fr;padding:0 0 26px 40px}
  .t2 .yr{grid-column:1;justify-self:start;padding:0 0 0 2px;font-size:27px;margin-bottom:10px}
  .t2 .dot{left:7px;top:12px;width:13px;height:13px;margin-left:0}
  .t2 .card,.t2.flip .card,.t2:not(.flip) .card{grid-column:1;grid-row:auto;justify-self:stretch;max-width:none}
}
/* ---------- 数据 ---------- */
.stats{background:var(--dark);padding:64px 0}
.stats .container{display:grid;grid-template-columns:repeat(4,1fr);gap:20px;text-align:center}
.stats b{color:#fff;font-size:44px;font-family:Arial,sans-serif}
.stats b i{font-style:normal;font-size:18px;margin-left:4px;color:var(--red);font-weight:700}
.stats p{color:rgba(255,255,255,.65);font-size:14px;margin-top:4px}

/* ---------- 卖点 ---------- */
.adv-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:22px}
.adv{background:#fff;border:1px solid var(--line);border-radius:8px;padding:30px 26px;transition:.25s}
.adv:hover{box-shadow:0 16px 36px rgba(0,0,0,.1);transform:translateY(-4px)}
.adv .no{font-size:30px;font-weight:800;color:rgba(225,10,23,.18);font-family:Arial,sans-serif;line-height:1}
.adv h3{font-size:18px;color:var(--dark);margin:10px 0 8px}
.adv p{font-size:14px;color:var(--muted)}

/* ---------- 合作品牌 ---------- */
.brands{display:flex;flex-wrap:wrap;gap:14px;justify-content:center}
.brands span{border:1px solid var(--line);border-radius:999px;padding:10px 28px;font-size:16px;color:var(--dark);font-weight:600;background:#fff}
.brands span.hot{background:var(--red);border-color:var(--red);color:#fff}

/* ---------- 案例 ---------- */
.case-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:20px}
.case-page-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:20px}
.case-card{border-radius:8px;overflow:hidden;position:relative;background:var(--dark);display:block}
.case-card img{width:100%;aspect-ratio:3/4;object-fit:cover;transition:transform .5s,opacity .3s}
.case-card:hover img{transform:scale(1.05);opacity:.85}
.case-card .info{position:absolute;left:0;right:0;bottom:0;padding:38px 16px 14px;background:linear-gradient(transparent,rgba(10,11,14,.82));color:#fff}
.case-card h3{font-size:16px}
.case-card .info p{font-size:12.5px;color:rgba(255,255,255,.75)}

/* ---------- 产品页分块 ---------- */
.prod-block{display:grid;grid-template-columns:460px 1fr;gap:52px;align-items:center;padding:56px 0;border-bottom:1px solid var(--line);scroll-margin-top:100px}
.prod-block:first-child{padding-top:8px}
.prod-block:last-of-type{border-bottom:0}
.prod-block:nth-child(even){grid-template-columns:1fr 460px}
.prod-block:nth-child(even) .pic{order:2}
.prod-block .pic img{border-radius:8px;box-shadow:0 16px 40px rgba(0,0,0,.12);aspect-ratio:3/4;object-fit:cover;width:100%}
.prod-block h2{font-size:27px;color:var(--dark);font-weight:800}
.prod-block h2 small{display:block;font-size:12.5px;letter-spacing:3px;color:var(--muted);font-weight:600;margin-top:2px;font-family:Arial,sans-serif}
.prod-block .txt>p{margin:14px 0 18px}
.feat li{position:relative;padding-left:22px;margin-bottom:8px;font-size:14.5px}
.feat li::before{content:"";position:absolute;left:0;top:11px;width:8px;height:8px;background:var(--red);border-radius:2px}
.spec-table{width:100%;border-collapse:collapse;margin:18px 0;font-size:14px}
.spec-table th{background:var(--gray);text-align:left;padding:10px 14px;color:var(--dark);white-space:nowrap;width:110px;border:1px solid var(--line)}
.spec-table td{padding:10px 14px;border:1px solid var(--line)}
.tag-price{display:inline-block;background:rgba(225,10,23,.08);color:var(--red);font-weight:700;padding:8px 16px;border-radius:4px;font-size:14.5px}

/* ---------- 关于页 ---------- */
.about-imgs{display:grid;grid-template-columns:repeat(3,1fr);gap:14px}
.about-imgs img{width:100%;aspect-ratio:16/10;object-fit:cover;border-radius:6px}
.info-table{width:100%;border-collapse:collapse;font-size:14.5px;background:#fff;border-radius:8px;overflow:hidden}
.info-table th{background:var(--dark);color:#fff;text-align:left;padding:12px 18px;width:160px;font-weight:600}
.info-table td{padding:12px 18px;border-bottom:1px solid var(--line)}
.info-table tr:last-child td{border-bottom:0}
.founder{display:grid;grid-template-columns:1fr 1.4fr;gap:44px;align-items:center}
.founder .card{background:#fff;border:1px solid var(--line);border-radius:10px;padding:34px 30px;box-shadow:0 12px 30px rgba(0,0,0,.06)}
.founder .card .role{color:var(--red);font-weight:700;font-size:14px;letter-spacing:2px}
.founder .card h3{font-size:26px;color:var(--dark);margin:6px 0 16px}
.founder .kv{border-top:1px dashed var(--line);padding:12px 0;font-size:14.5px}
.founder .kv b{color:var(--dark)}
.founder .kv span{color:var(--muted)}
.founder .story p{margin-bottom:14px;text-align:justify}
.honor-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:20px}
.honor{background:#fff;border:1px solid var(--line);border-radius:8px;padding:28px 22px;text-align:center;transition:.25s}
.honor:hover{box-shadow:0 14px 32px rgba(0,0,0,.1);transform:translateY(-4px)}
.honor .ico{display:inline-flex;width:44px;height:44px;border-radius:50%;background:rgba(225,10,23,.07);color:var(--red);align-items:center;justify-content:center}
.honor .ico svg{width:22px;height:22px}
.honor h3{font-size:16.5px;color:var(--dark);margin:12px 0 6px}
.honor p{font-size:13px;color:var(--muted)}
.value-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:22px}
.value{background:#fff;border:1px solid var(--line);border-radius:8px;padding:30px 26px;text-align:center}
.value h3{color:var(--red);font-size:17px;margin-bottom:8px}
.value p{font-size:14.5px;color:var(--text)}
.map-tip{background:#fff;border-left:4px solid var(--red);padding:16px 20px;font-size:14px;color:var(--text);border-radius:0 6px 6px 0;box-shadow:0 4px 14px rgba(0,0,0,.05)}

/* ---------- FAQ ---------- */
.faq-item{background:#fff;border:1px solid var(--line);border-radius:8px;margin-bottom:14px;overflow:hidden}
.faq-item summary{cursor:pointer;padding:18px 22px;font-weight:700;color:var(--dark);font-size:15.5px;list-style:none;position:relative;padding-right:48px}
.faq-item summary::-webkit-details-marker{display:none}
.faq-item summary::after{content:"+";position:absolute;right:20px;top:50%;transform:translateY(-50%);font-size:22px;color:var(--red);font-family:Arial}
.faq-item[open] summary::after{content:"-"}
.faq-item .ans{padding:0 22px 20px;color:var(--text);font-size:14.5px;border-top:1px dashed var(--line);padding-top:14px}

/* ---------- 内页头图 ---------- */
.page-banner{height:300px;background-size:cover;background-position:center;display:flex;align-items:center;position:relative}
.page-banner::before{content:"";position:absolute;inset:0;background:rgba(14,15,18,.55)}
.page-banner .container{position:relative}
.page-banner h1{color:#fff;font-size:36px;font-weight:800}
.crumb{color:rgba(255,255,255,.75);font-size:14px;margin-top:8px}
.crumb a{color:rgba(255,255,255,.9)}
.crumb a:hover{color:#fff}

/* ---------- 联系页 ---------- */
.contact-grid{display:grid;grid-template-columns:1fr 1.1fr;gap:56px;align-items:start}
.contact-info .item{display:flex;gap:16px;margin-bottom:24px}
.contact-info .ico{flex:0 0 46px;height:46px;background:rgba(225,10,23,.08);color:var(--red);border-radius:8px;display:flex;align-items:center;justify-content:center}
.contact-info .ico svg{width:22px;height:22px}
.contact-info h3{font-size:16px;color:var(--dark)}
.contact-info .item p{font-size:14px;color:var(--muted)}
.contact-info a{color:var(--red);font-weight:700}
.form{background:#fff;border:1px solid var(--line);border-radius:10px;padding:30px 28px;box-shadow:0 10px 30px rgba(0,0,0,.06)}
.form label{display:block;font-size:14px;font-weight:700;color:var(--dark);margin:14px 0 6px}
.form label:first-child{margin-top:0}
.form input,.form select,.form textarea{width:100%;border:1px solid var(--line);border-radius:6px;padding:11px 14px;font-size:14.5px;font-family:inherit;transition:.2s;background:var(--gray)}
.form input:focus,.form select:focus,.form textarea:focus{outline:0;border-color:var(--red);background:#fff}
.form .btn{width:100%;margin-top:20px;border:0;cursor:pointer}

/* ---------- CTA ---------- */
.cta-band{background:var(--red);color:#fff;padding:52px 0}
.cta-band .container{display:flex;align-items:center;justify-content:space-between;gap:30px;flex-wrap:wrap}
.cta-band h2{font-size:26px;font-weight:800}
.cta-band p{opacity:.88;font-size:15px;margin-top:6px}
.cta-band .phone{text-align:right;line-height:1.2}
.cta-band .phone small{display:block;font-size:13px;opacity:.8;letter-spacing:2px}
.cta-band .phone{font-size:34px;font-weight:800;font-family:Arial,sans-serif}

/* ---------- 页脚 ---------- */
.footer{background:var(--dark);color:rgba(255,255,255,.68);padding:64px 0 0;font-size:14px}
.footer .cols{display:grid;grid-template-columns:1.5fr 1fr 1fr 1.4fr;gap:40px;padding-bottom:48px}
.footer h4{color:#fff;font-size:16.5px;margin-bottom:18px;position:relative;padding-bottom:10px}
.footer h4::after{content:"";position:absolute;left:0;bottom:0;width:26px;height:2px;background:var(--red)}
.footer li{margin-bottom:9px}
.footer a:hover{color:#fff}
.footer .contact b{color:#fff;font-weight:600}
.footer-bottom{border-top:1px solid rgba(255,255,255,.09);padding:20px 0;text-align:center;font-size:13px;color:rgba(255,255,255,.45)}
.footer-bottom a{color:rgba(255,255,255,.55)}
.footer-bottom a:hover{color:#fff}

/* ---------- 浮动条 ---------- */
.float-bar{position:fixed;right:18px;bottom:80px;display:flex;flex-direction:column;gap:10px;z-index:90}
.float-bar a{width:52px;height:52px;border-radius:50%;background:var(--red);color:#fff;display:flex;align-items:center;justify-content:center;font-size:12.5px;font-weight:700;box-shadow:0 8px 20px rgba(225,10,23,.35);opacity:0;pointer-events:none;transition:.3s;transform:translateY(8px)}
.float-bar a:first-child{opacity:1;pointer-events:auto}
.float-bar .totop.show{opacity:1;pointer-events:auto;transform:translateY(0)}
.float-bar a:hover{background:var(--red-dark)}

/* ---------- 响应式 ---------- */
@media (max-width:1024px){
  .prod-grid{grid-template-columns:repeat(3,1fr)}
  .adv-grid,.value-grid{grid-template-columns:repeat(2,1fr)}
  .case-grid,.case-page-grid,.honor-grid{grid-template-columns:repeat(2,1fr)}
  .about-imgs{grid-template-columns:repeat(2,1fr)}
  .intro,.contact-grid,.founder{grid-template-columns:1fr;gap:36px}
  .prod-block,.prod-block:nth-child(even){grid-template-columns:1fr;gap:26px}
  .prod-block:nth-child(even) .pic{order:0}
  .prod-block .pic img{aspect-ratio:16/10}
  .timeline{grid-template-columns:repeat(2,1fr);gap:34px}
  .timeline::before{display:none}
  .nav-phone{display:none}
}
@media (max-width:768px){
  .section{padding:56px 0}
  .banner{height:64vh;min-height:440px}
  .banner h2{font-size:27px}
  .banner p{font-size:14.5px}
  .sec-head h2{font-size:25px}
  .stats .container{grid-template-columns:repeat(2,1fr);gap:30px}
  .prod-grid{grid-template-columns:repeat(2,1fr);gap:12px}
  .nav{height:64px}
  .logo img{height:36px}
  .burger{display:block}
  .nav-list{position:fixed;top:64px;left:0;right:0;background:#fff;flex-direction:column;align-items:stretch;gap:0;padding:8px 0;box-shadow:0 20px 30px rgba(0,0,0,.12);transform:translateY(-130%);transition:.3s;z-index:99;max-height:calc(100vh - 64px);overflow:auto;margin-left:0}
  .nav-list.open{transform:translateY(0)}
  .nav-list>li>a{padding:14px 24px;border-bottom:1px solid var(--gray)}
  .nav-list>li>a.active::after{display:none}
  .dropdown{position:static;opacity:1;visibility:visible;transform:none;box-shadow:none;border:0;padding:0 0 6px 24px;display:none}
  .nav-list>li:hover .dropdown{display:block}
  .nav-list>li.open .dropdown{display:block}
  .nav-cta{display:inline-block;margin:10px 24px;width:calc(100% - 48px);text-align:center}
  .footer .cols{grid-template-columns:1fr;gap:30px}
  .nums{flex-wrap:wrap;gap:22px}
  .adv-grid,.value-grid,.honor-grid,.case-grid,.case-page-grid{grid-template-columns:1fr}
  .about-imgs{grid-template-columns:1fr 1fr}
  .timeline{grid-template-columns:1fr}
  .cta-band .container{flex-direction:column;text-align:center}
  .cta-band .phone{text-align:center}
  .float-bar{right:12px;bottom:64px}
}