/* ============================================================
   山东北方海泰新材料有限公司 · 官网样式
   Shandong North Haitai New Materials Co., Ltd.
   Static B2B site · no external dependencies
   ============================================================ */

:root{
  --primary:#0A3A6B;        /* 深海军蓝 */
  --primary2:#0E5FA8;       /* 中蓝 */
  --primary3:#1B7FD6;       /* 亮蓝 */
  --accent:#E8A33D;         /* 工业琥珀金 */
  --accent-dark:#C77F1B;
  --bg:#FFFFFF;
  --bg-soft:#F4F7FA;
  --bg-blue:#EAF2FA;
  --text:#1F2937;
  --text2:#5B6472;
  --line:#E5E9F0;
  --ok:#1F8A4C;
  --radius:14px;
  --shadow:0 6px 24px rgba(10,58,107,.08);
  --font:"PingFang SC","Microsoft YaHei","Noto Sans SC","Helvetica Neue",Arial,sans-serif;
}
*{margin:0;padding:0;box-sizing:border-box;}
html{scroll-behavior:smooth;}
body{font-family:var(--font);color:var(--text);background:var(--bg);line-height:1.75;font-size:16px;-webkit-font-smoothing:antialiased;}
img{max-width:100%;height:auto;display:block;}
a{color:var(--primary2);text-decoration:none;}
a:hover{color:var(--primary3);}
ul,ol{margin-left:1.2em;}
.container{max-width:1200px;margin:0 auto;padding:0 20px;}
section{padding:72px 0;}
h1,h2,h3,h4{line-height:1.35;color:var(--primary);}
.section-head{text-align:center;max-width:760px;margin:0 auto 44px;}
.section-head .kicker{display:inline-block;font-size:13px;letter-spacing:3px;color:var(--primary2);background:var(--bg-blue);padding:4px 14px;border-radius:20px;margin-bottom:14px;font-weight:600;}
.section-head h2{font-size:32px;font-weight:700;}
.section-head p{color:var(--text2);margin-top:10px;}
.lead{color:var(--text2);font-size:17px;}

/* ---------- 顶部条 ---------- */
.topbar{background:var(--primary);color:#DCE7F3;font-size:13.5px;}
.topbar .container{display:flex;justify-content:space-between;align-items:center;min-height:38px;gap:10px;flex-wrap:wrap;}
.topbar a{color:#DCE7F3;}
.topbar a:hover{color:#fff;}
.topbar .tb-l span{margin-right:18px;}
.topbar .tb-l svg{vertical-align:-3px;margin-right:4px;}

/* ---------- 页头导航 ---------- */
.header{position:sticky;top:0;z-index:100;background:rgba(255,255,255,.97);border-bottom:1px solid var(--line);}
.header .container{display:flex;align-items:center;justify-content:space-between;height:76px;gap:16px;}
.brand{display:flex;align-items:center;gap:12px;min-width:0;}
.brand .logo{flex:0 0 auto;}
.brand .bt{line-height:1.2;min-width:0;}
.brand .bt .cn{font-size:21px;font-weight:800;color:var(--primary);letter-spacing:1px;white-space:nowrap;}
.brand .bt .en{font-size:10.5px;color:var(--text2);letter-spacing:1.6px;text-transform:uppercase;white-space:nowrap;}
.nav{display:flex;align-items:center;gap:4px;}
.nav a{padding:8px 14px;font-size:15px;font-weight:500;color:var(--text);border-radius:8px;}
.nav a:hover{color:var(--primary2);background:var(--bg-soft);}
.nav a.active{color:var(--primary2);background:var(--bg-blue);}
.nav .cta{margin-left:8px;background:var(--accent);color:#3A2A00;font-weight:700;border-radius:8px;padding:9px 18px;}
.nav .cta:hover{background:var(--accent-dark);color:#fff;}
.nav-toggle{display:none;background:none;border:1px solid var(--line);border-radius:8px;padding:8px 10px;cursor:pointer;}
.nav-toggle svg{display:block;}
.lang{font-size:13px;color:var(--text2);border-left:1px solid var(--line);padding-left:12px;margin-left:4px;white-space:nowrap;}
.lang a{font-weight:600;padding:4px 6px;border-radius:6px;}
.lang a.on{color:var(--primary2);background:var(--bg-blue);}

/* ---------- 主视觉 Hero ---------- */
.hero{position:relative;color:#fff;background:linear-gradient(120deg,#082A4F 0%,#0A3A6B 46%,#0E5FA8 100%);overflow:hidden;}
.hero::after{content:"";position:absolute;inset:0;background:radial-gradient(600px 300px at 85% 20%,rgba(27,127,214,.35),transparent 70%),radial-gradient(500px 300px at 10% 90%,rgba(232,163,61,.18),transparent 70%);pointer-events:none;}
.hero .container{position:relative;z-index:2;padding:96px 20px 100px;}
.hero .h-tag{display:inline-flex;align-items:center;gap:8px;font-size:13.5px;letter-spacing:2px;color:#BFD8F2;border:1px solid rgba(191,216,242,.4);border-radius:30px;padding:6px 16px;margin-bottom:22px;}
.hero h1{color:#fff;font-size:44px;font-weight:800;line-height:1.3;letter-spacing:.5px;}
.hero h1 .hl{color:var(--accent);}
.hero .sub{color:#C9DAEC;font-size:18px;margin:18px 0 8px;max-width:700px;}
.hero .sub2{color:#9FBBD9;font-size:15px;max-width:720px;}
.hero .facts{margin-top:26px;display:flex;gap:10px;flex-wrap:wrap;}
.hero .facts span{font-size:13.5px;border:1px solid rgba(255,255,255,.28);border-radius:20px;padding:5px 14px;color:#E3EEF9;}
.hero .btns{margin-top:34px;display:flex;gap:14px;flex-wrap:wrap;}
.btn{display:inline-flex;align-items:center;gap:8px;padding:13px 28px;border-radius:10px;font-size:16px;font-weight:700;transition:.18s;cursor:pointer;border:none;}
.btn svg{vertical-align:-2px;}
.btn-accent{background:var(--accent);color:#3A2A00;}
.btn-accent:hover{background:var(--accent-dark);color:#fff;}
.btn-ghost{background:rgba(255,255,255,.08);color:#fff;border:1.5px solid rgba(255,255,255,.5);}
.btn-ghost:hover{background:rgba(255,255,255,.18);}
.btn-blue{background:var(--primary2);color:#fff;}
.btn-blue:hover{background:var(--primary);}
.hero-grid{display:grid;grid-template-columns:1.05fr .95fr;gap:44px;align-items:center;}
.hero-media{position:relative;}
.hero-media .frame{background:#fff;border-radius:18px;padding:10px;box-shadow:0 30px 60px rgba(0,0,0,.35);}
.hero-media .frame img{border-radius:12px;aspect-ratio:4/3;object-fit:cover;width:100%;}
.hero-media .badge{position:absolute;left:-14px;bottom:-16px;background:var(--accent);color:#3A2A00;border-radius:12px;padding:12px 18px;font-weight:800;font-size:14px;box-shadow:0 12px 30px rgba(0,0,0,.3);}
.hero-media .badge small{display:block;font-weight:600;font-size:11.5px;color:rgba(58,42,0,.75);}

/* ---------- 信任条 ---------- */
.trust{background:var(--bg-soft);border-bottom:1px solid var(--line);padding:26px 0;}
.trust .container{display:grid;grid-template-columns:repeat(4,1fr);gap:18px;}
.trust .item{display:flex;gap:12px;align-items:center;}
.trust .ic{flex:0 0 42px;height:42px;border-radius:10px;background:var(--bg-blue);color:var(--primary2);display:flex;align-items:center;justify-content:center;}
.trust .t b{display:block;font-size:15px;color:var(--primary);}
.trust .t span{font-size:12.5px;color:var(--text2);}

/* ---------- 数字能力 ---------- */
.nums .container{display:grid;grid-template-columns:repeat(5,1fr);gap:16px;}
.num-card{background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:26px 18px;text-align:center;box-shadow:var(--shadow);}
.num-card .v{font-size:34px;font-weight:800;color:var(--primary2);}
.num-card .v small{font-size:16px;font-weight:700;color:var(--accent-dark);}
.num-card .k{font-size:13.5px;color:var(--text2);margin-top:6px;}

/* ---------- 板块卡片 ---------- */
.grid3{display:grid;grid-template-columns:repeat(3,1fr);gap:22px;}
.grid2{display:grid;grid-template-columns:repeat(2,1fr);gap:22px;}
.biz-card{background:#fff;border:1px solid var(--line);border-radius:var(--radius);overflow:hidden;display:flex;flex-direction:column;box-shadow:var(--shadow);transition:.2s;}
.biz-card:hover{transform:translateY(-4px);box-shadow:0 14px 34px rgba(10,58,107,.14);}
.biz-card .pic{aspect-ratio:16/10;overflow:hidden;}
.biz-card .pic img{width:100%;height:100%;object-fit:cover;transition:.35s;}
.biz-card:hover .pic img{transform:scale(1.05);}
.biz-card .bd{padding:22px 22px 24px;display:flex;flex-direction:column;flex:1;}
.biz-card .bd .no{font-size:12px;color:var(--accent-dark);font-weight:700;letter-spacing:2px;}
.biz-card .bd h3{font-size:20px;margin:4px 0 10px;}
.biz-card .bd p{color:var(--text2);font-size:14.5px;flex:1;}
.biz-card .bd .more{margin-top:14px;font-weight:700;font-size:14px;color:var(--primary2);}

/* ---------- 工艺流程图 ---------- */
.flow{display:grid;grid-template-columns:repeat(6,1fr);gap:10px;counter-reset:st;}
.step{background:#fff;border:1px solid var(--line);border-radius:12px;padding:18px 12px;text-align:center;position:relative;box-shadow:var(--shadow);}
.step::after{content:"→";position:absolute;right:-13px;top:50%;transform:translateY(-50%);color:var(--primary3);font-size:20px;font-weight:700;z-index:2;}
.step:last-child::after{content:"";}
.step .n{width:30px;height:30px;margin:0 auto 10px;border-radius:50%;background:var(--primary2);color:#fff;font-weight:800;font-size:14px;display:flex;align-items:center;justify-content:center;}
.step b{font-size:15px;color:var(--primary);display:block;}
.step span{font-size:12px;color:var(--text2);display:block;margin-top:4px;}

/* ---------- 应用领域标签 ---------- */
.tags{display:flex;flex-wrap:wrap;gap:12px;justify-content:center;}
.tags span{border:1px solid var(--line);background:#fff;border-radius:30px;padding:10px 22px;font-size:15px;font-weight:500;color:var(--text);box-shadow:var(--shadow);}
.tags span b{color:var(--primary2);}

/* ---------- 表格 ---------- */
.tbl-wrap{overflow-x:auto;border:1px solid var(--line);border-radius:12px;}
table.tbl{width:100%;border-collapse:collapse;font-size:14.5px;min-width:560px;}
.tbl th{background:var(--primary);color:#fff;text-align:left;padding:12px 16px;font-weight:600;}
.tbl td{padding:12px 16px;border-top:1px solid var(--line);vertical-align:top;}
.tbl tr:nth-child(even) td{background:var(--bg-soft);}

/* ---------- 新闻 ---------- */
.news-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:20px;}
.news-item{background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:22px;box-shadow:var(--shadow);display:flex;flex-direction:column;transition:.2s;}
.news-item:hover{transform:translateY(-3px);box-shadow:0 14px 34px rgba(10,58,107,.12);}
.news-item .meta{font-size:12.5px;color:var(--text2);display:flex;gap:10px;align-items:center;margin-bottom:8px;}
.news-item .meta .cat{background:var(--bg-blue);color:var(--primary2);border-radius:6px;padding:1px 9px;font-weight:600;}
.news-item h3{font-size:17.5px;}
.news-item p{font-size:14px;color:var(--text2);margin-top:8px;flex:1;}
.news-item .more{margin-top:12px;font-size:13.5px;font-weight:700;color:var(--primary2);}

/* ---------- 文章页 ---------- */
.page-hero{background:linear-gradient(120deg,#082A4F,#0E5FA8);color:#fff;padding:64px 0;}
.page-hero h1{color:#fff;font-size:34px;}
.page-hero .crumb{font-size:13.5px;color:#BFD8F2;margin-bottom:12px;}
.page-hero .crumb a{color:#BFD8F2;}
.article{max-width:860px;margin:0 auto;}
.article .post{background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:40px 44px;box-shadow:var(--shadow);margin-top:-40px;position:relative;}
.article .post h1{font-size:26px;margin-bottom:10px;}
.article .post .meta{font-size:13px;color:var(--text2);border-bottom:1px solid var(--line);padding-bottom:16px;margin-bottom:20px;}
.article .post p{margin:12px 0;}
.article .post h2{font-size:20px;margin:24px 0 10px;}
.article .post ul,.article .post ol{margin:10px 0 10px 1.4em;}
.article .post img{border-radius:10px;margin:16px 0;}

/* ---------- 联系我们 ---------- */
.contact-grid{display:grid;grid-template-columns:1fr 1fr;gap:26px;}
.contact-card{background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:26px;box-shadow:var(--shadow);}
.contact-card h3{font-size:19px;margin-bottom:14px;}
.c-list{list-style:none;margin:0;}
.c-list li{display:flex;gap:12px;padding:10px 0;border-bottom:1px dashed var(--line);font-size:15px;}
.c-list li:last-child{border-bottom:none;}
.c-list .ic{flex:0 0 38px;height:38px;border-radius:9px;background:var(--bg-blue);color:var(--primary2);display:flex;align-items:center;justify-content:center;}
.c-list b{display:block;font-size:12px;color:var(--text2);font-weight:600;}
.form label{display:block;font-size:13.5px;font-weight:600;color:var(--text);margin:12px 0 5px;}
.form input,.form select,.form textarea{width:100%;border:1px solid var(--line);border-radius:9px;padding:11px 13px;font-size:15px;font-family:inherit;background:#fff;color:var(--text);}
.form input:focus,.form select:focus,.form textarea:focus{outline:none;border-color:var(--primary3);box-shadow:0 0 0 3px rgba(27,127,214,.15);}
.form .row2{display:grid;grid-template-columns:1fr 1fr;gap:14px;}
.form-note{font-size:12.5px;color:var(--text2);margin-top:10px;}
.qr-box{display:flex;gap:18px;align-items:center;margin-top:16px;}
.qr-box img{width:130px;height:130px;border:1px solid var(--line);border-radius:10px;object-fit:contain;background:#fff;}

/* ---------- CTA 带 ---------- */
.cta-band{background:linear-gradient(120deg,#082A4F,#0E5FA8);color:#fff;text-align:center;padding:64px 20px;}
.cta-band h2{color:#fff;font-size:30px;}
.cta-band p{color:#C9DAEC;max-width:640px;margin:12px auto 26px;}
.cta-band .btns{justify-content:center;display:flex;gap:14px;flex-wrap:wrap;}

/* ---------- 页脚 ---------- */
.footer{background:#07233F;color:#A9BFD8;font-size:13.5px;}
.footer .container{padding:52px 20px 30px;}
.footer-grid{display:grid;grid-template-columns:1.4fr 1fr 1fr 1.2fr;gap:30px;margin-bottom:30px;}
.footer h4{color:#fff;font-size:15px;margin-bottom:14px;}
.footer a{color:#A9BFD8;}
.footer a:hover{color:#fff;}
.footer .links{list-style:none;margin:0;}
.footer .links li{padding:3px 0;}
.footer .f-brand .bt .cn{font-size:19px;font-weight:800;color:#fff;}
.footer .f-brand p{margin-top:10px;font-size:13px;color:#8FA8C4;max-width:320px;}
.footer .copy{border-top:1px solid rgba(255,255,255,.12);padding-top:18px;text-align:center;color:#7E97B3;font-size:12.5px;line-height:2;}
.footer .copy a{color:#A9BFD8;}
.footer .copy .icp{display:inline-block;margin-left:6px;}

/* ---------- 页面通用 ---------- */
.sub-page{background:var(--bg-soft);}
.card{padding:16px;border:1px solid var(--line);border-radius:12px;background:#fff;}
.list-2{display:grid;grid-template-columns:1fr 1fr;gap:14px;}
.check-item{display:flex;gap:10px;align-items:flex-start;background:#fff;border:1px solid var(--line);border-radius:10px;padding:12px 14px;}
.check-item svg{flex:0 0 20px;margin-top:3px;color:var(--ok);}
.check-item b{color:var(--primary);}
.check-item span{color:var(--text2);font-size:13.5px;}
.profile-img{border-radius:14px;box-shadow:var(--shadow);}
.mt16{margin-top:16px;}.mt24{margin-top:24px;}.mt40{margin-top:40px;}

/* ---------- 移动端 ---------- */
@media (max-width:1024px){
  .hero-grid{grid-template-columns:1fr;gap:36px;}
  .trust .container{grid-template-columns:repeat(2,1fr);}
  .nums .container{grid-template-columns:repeat(3,1fr);}
  .flow{grid-template-columns:repeat(3,1fr);}
  .step:nth-child(3)::after{content:"";}
  .footer-grid{grid-template-columns:1fr 1fr;}
}
@media (max-width:820px){
  section{padding:56px 0;}
  .nav{display:none;position:absolute;top:76px;left:0;right:0;background:#fff;border-bottom:1px solid var(--line);flex-direction:column;align-items:stretch;padding:12px 16px 18px;gap:2px;}
  .nav.open{display:flex;}
  .nav a{padding:12px 10px;font-size:16px;}
  .nav .cta{margin:8px 0 0;text-align:center;}
  .nav-toggle{display:block;}
  .lang{border-left:none;padding-left:0;margin-left:0;}
  .hero h1{font-size:32px;}
  .hero .container{padding:64px 20px 72px;}
  .grid3,.grid2,.news-grid,.contact-grid{grid-template-columns:1fr;}
  .nums .container{grid-template-columns:repeat(2,1fr);}
  .section-head h2{font-size:26px;}
  .form .row2{grid-template-columns:1fr;}
  .article .post{padding:26px 20px;}
  .footer-grid{grid-template-columns:1fr;}
}