/* =========================================================
   沧州市大唐管业有限公司 · 官方网站 移动端独立模板样式
   说明：本样式为移动端单独设计，与 PC 端分开维护。
   ========================================================= */

:root{
  --navy:#0d2742;
  --navy-3:#1c4470;
  --accent:#f0841a;
  --accent-2:#e06f0c;
  --steel:#4a5b6c;
  --steel-light:#7d8a99;
  --line:#e8ecf1;
  --bg:#f5f7fa;
  --white:#fff;
  --radius:10px;
}
*{margin:0;padding:0;box-sizing:border-box;}
html{scroll-behavior:smooth;}
body{
  font-family:"Microsoft YaHei","PingFang SC","Helvetica Neue",Helvetica,Arial,sans-serif;
  color:#22303c;background:#fff;font-size:15px;line-height:1.7;-webkit-font-smoothing:antialiased;
  padding-bottom:60px; /* 给底部联系栏留空间 */
}
img{max-width:100%;display:block;}
a{text-decoration:none;color:inherit;}
ul,ol{list-style:none;}
.wrap{padding:0 4%;}

/* ---------- 顶部 ---------- */
.m-head{
  position:sticky;top:0;z-index:200;background:#fff;border-bottom:1px solid var(--line);
  display:flex;align-items:center;justify-content:space-between;height:56px;padding:0 4%;
}
.m-logo{display:flex;align-items:center;}
.m-logo .mark{width:38px;height:38px;border-radius:7px;background:linear-gradient(135deg,var(--navy),var(--navy-3));display:flex;align-items:center;justify-content:center;margin-right:8px;}
.m-logo .mark svg{width:24px;height:24px;}
.m-logo b{font-size:18px;color:var(--navy);}
.m-logo span{font-size:9px;color:var(--steel-light);display:block;letter-spacing:1px;}
.m-menu-btn{width:40px;height:40px;border:0;background:none;display:flex;flex-direction:column;align-items:center;justify-content:center;gap:5px;cursor:pointer;}
.m-menu-btn i{display:block;width:24px;height:2.5px;background:var(--navy);border-radius:2px;transition:.3s;}
.m-menu-btn.open i:nth-child(1){transform:translateY(7.5px) rotate(45deg);}
.m-menu-btn.open i:nth-child(2){opacity:0;}
.m-menu-btn.open i:nth-child(3){transform:translateY(-7.5px) rotate(-45deg);}

/* ---------- 抽屉导航 ---------- */
.m-nav{
  position:fixed;top:0;left:0;width:78%;max-width:300px;height:100%;background:#fff;z-index:300;
  transform:translateX(-100%);transition:.3s;box-shadow:0 0 30px rgba(13,39,66,.2);
  overflow-y:auto;
}
.m-nav.open{transform:translateX(0);}
.m-nav .n-head{display:flex;align-items:center;justify-content:space-between;padding:18px 4%;background:var(--navy);color:#fff;}
.m-nav .n-head b{font-size:16px;}
.m-nav .n-close{border:0;background:none;color:#fff;font-size:24px;cursor:pointer;}
.m-nav>ul{padding:8px 0;}
.m-nav>ul>li>a{display:block;padding:14px 5%;color:#2b3a49;font-size:16px;font-weight:600;border-bottom:1px solid var(--bg);}
.m-nav>ul>li>a.on{color:var(--accent);}
.m-nav .sub{padding:0 0 6px;display:none;}
.m-nav>ul>li.open .sub{display:block;}
.m-nav .sub a{display:block;padding:10px 9%;font-size:14px;color:var(--steel);border-bottom:1px dashed var(--line);}
.m-nav .n-contact{padding:16px 5%;background:var(--bg);}
.m-nav .n-contact p{font-size:13px;color:var(--steel-light);margin-bottom:6px;}
.m-nav .n-contact .tel{color:var(--accent);font-weight:700;font-size:18px;}
.m-mask{position:fixed;inset:0;background:rgba(13,39,66,.5);z-index:290;opacity:0;visibility:hidden;transition:.3s;}
.m-mask.show{opacity:1;visibility:visible;}

/* ---------- 首页首屏 ---------- */
.m-hero{position:relative;height:auto;}
.m-hero img{width:100%;height:230px;object-fit:cover;}
.m-hero .mask{position:absolute;inset:0;background:linear-gradient(180deg,rgba(13,39,66,.55),rgba(13,39,66,.82));}
.m-hero .txt{position:absolute;left:0;right:0;bottom:0;padding:20px 5%;color:#fff;}
.m-hero .txt h1{font-size:22px;font-weight:800;line-height:1.45;display:block;}
.m-hero .txt p{font-size:13px;color:#d8e2ee;margin-top:8px;}

/* ---------- 内页横幅 ---------- */
.m-banner{position:relative;height:150px;overflow:hidden;background:var(--navy);}
.m-banner img{width:100%;height:100%;object-fit:cover;opacity:.35;}
.m-banner .mask{position:absolute;inset:0;background:linear-gradient(180deg,rgba(13,39,66,.7),rgba(13,39,66,.85));}
.m-banner .txt{position:absolute;left:0;right:0;top:50%;transform:translateY(-50%);padding:0 5%;color:#fff;}
.m-banner .txt h1{font-size:24px;font-weight:800;line-height:1.3;}
.m-banner .txt p{font-size:12px;color:#cfd9e6;margin-top:6px;}

/* ---------- 面包屑 ---------- */
.m-crumbs{background:var(--bg);font-size:12px;color:var(--steel-light);padding:10px 4%;border-bottom:1px solid var(--line);}
.m-crumbs em{font-style:normal;color:var(--accent);}
.m-crumbs a:hover{color:var(--accent);}

/* ---------- 区块 ---------- */
.m-sec{padding:34px 0;}
.m-sec.gray{background:var(--bg);}
.m-sec-tit{text-align:center;margin-bottom:24px;}
.m-sec-tit .sub{color:var(--accent);font-size:11px;letter-spacing:2px;font-weight:700;}
.m-sec-tit h2{font-size:22px;color:var(--navy);font-weight:800;margin-top:4px;}
.m-sec-tit .line{width:40px;height:3px;background:var(--accent);margin:10px auto 0;border-radius:2px;}

/* ---------- 数字条 ---------- */
.m-stats{background:linear-gradient(135deg,var(--navy),var(--navy-3));display:flex;flex-wrap:wrap;}
.m-stat{width:33.33%;text-align:center;padding:22px 6px;}
.m-stat b{font-size:24px;color:var(--accent);font-weight:800;display:block;}
.m-stat b small{font-size:13px;}
.m-stat p{color:#cfd9e6;font-size:11px;margin-top:2px;}

/* ---------- 关于 ---------- */
.m-about img{border-radius:var(--radius);}
.m-about .txt{padding:18px 4% 0;}
.m-about .txt h2{font-size:20px;color:var(--navy);font-weight:800;line-height:1.5;margin-bottom:10px;}
.m-about .txt h2 span{color:var(--accent);}
.m-about .txt p{font-size:13px;color:var(--steel);margin-bottom:8px;}
.m-about .feats{display:grid;grid-template-columns:1fr 1fr;gap:8px;margin:14px 0 18px;}
.m-about .feats li{font-size:12px;color:#2b3a49;display:flex;align-items:center;}
.m-about .feats li i{width:18px;height:18px;border-radius:50%;background:rgba(240,132,26,.15);color:var(--accent);display:flex;align-items:center;justify-content:center;font-size:10px;font-weight:700;margin-right:6px;flex:none;}

/* ---------- 优势 ---------- */
.m-adv .adv-card{background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:18px 16px;margin-bottom:14px;display:flex;align-items:flex-start;box-shadow:0 4px 14px rgba(13,39,66,.06);}
.m-adv .ico{width:40px;height:40px;border-radius:9px;background:rgba(240,132,26,.12);display:flex;align-items:center;justify-content:center;margin-right:12px;flex:none;}
.m-adv .ico svg{width:22px;height:22px;stroke:var(--accent);}
.m-adv .adv-card h3{font-size:15px;color:var(--navy);margin-bottom:4px;}
.m-adv .adv-card p{font-size:12px;color:var(--steel-light);}

/* ---------- 产品 ---------- */
.m-cats{display:flex;flex-wrap:wrap;gap:8px;margin-bottom:18px;}
.m-cats a{padding:6px 14px;border:1px solid var(--line);border-radius:20px;font-size:12px;color:#33424f;}
.m-cats a:hover,.m-cats a.on{background:var(--accent);color:#fff;border-color:var(--accent);}
.m-prods{display:grid;grid-template-columns:1fr 1fr;gap:12px;}
.m-prod{background:#fff;border:1px solid var(--line);border-radius:var(--radius);overflow:hidden;box-shadow:0 4px 14px rgba(13,39,66,.06);}
.m-prod img{width:100%;height:130px;object-fit:cover;}
.m-prod .bd{padding:12px;}
.m-prod h3{font-size:14px;color:var(--navy);}
.m-prod p{font-size:11px;color:var(--steel-light);margin-top:4px;height:48px;overflow:hidden;}
.m-prod .more{color:var(--accent);font-size:12px;font-weight:600;display:inline-block;margin-top:8px;}

/* ---------- 应用 ---------- */
.m-apps{display:grid;grid-template-columns:1fr 1fr;gap:12px;}
.m-app{position:relative;border-radius:var(--radius);overflow:hidden;height:120px;}
.m-app img{width:100%;height:100%;object-fit:cover;}
.m-app .cap{position:absolute;inset:auto 0 0 0;background:linear-gradient(0deg,rgba(13,39,66,.9),rgba(13,39,66,.1));padding:20px 10px 8px;color:#fff;}
.m-app .cap h3{font-size:13px;}
.m-app .cap span{font-size:10px;color:#c8d4e0;display:block;}

/* ---------- 设备 ---------- */
.m-equips{display:grid;grid-template-columns:1fr 1fr;gap:12px;}
.m-equip{background:#fff;border:1px solid var(--line);border-radius:var(--radius);overflow:hidden;box-shadow:0 4px 14px rgba(13,39,66,.06);}
.m-equip img{width:100%;height:120px;object-fit:cover;}
.m-equip .bd{padding:10px;}
.m-equip h3{font-size:13px;color:var(--navy);}
.m-equip p{font-size:11px;color:var(--steel-light);margin-top:4px;}

/* ---------- 资讯/知识 ---------- */
.m-news li{display:flex;gap:12px;padding:12px 4%;border-bottom:1px solid var(--line);}
.m-news li .pic{flex:0 0 120px;height:86px;overflow:hidden;border-radius:8px;}
.m-news li .pic img{width:100%;height:100%;object-fit:cover;}
.m-news li .txt h3{font-size:14px;color:var(--navy);line-height:1.5;}
.m-news li .txt p{font-size:11px;color:var(--steel-light);margin-top:6px;height:32px;overflow:hidden;}
.m-news li time{font-size:10px;color:var(--steel-light);}
.m-know{padding:0 4%;}
.m-know li{padding:13px 0;border-bottom:1px dashed var(--line);}
.m-know li a{font-size:14px;color:#2b3a49;display:block;}
.m-know li span{font-size:11px;color:var(--steel-light);}

/* ---------- 详情文章 ---------- */
.m-article{padding:24px 4%;}
.m-article h2{font-size:18px;color:var(--navy);margin:18px 0 8px;padding-left:10px;border-left:4px solid var(--accent);}
.m-article p{font-size:14px;color:var(--steel);margin-bottom:12px;}
.m-article img{border-radius:var(--radius);margin:12px 0;}

/* ---------- 产品详情块 ---------- */
.m-prod-block{padding:22px 4%;border-bottom:1px solid var(--line);}
.m-prod-block img{border-radius:var(--radius);}
.m-prod-block h3{font-size:18px;color:var(--navy);margin:12px 0 8px;}
.m-prod-block p{font-size:13px;color:var(--steel);margin-bottom:8px;}

/* ---------- 联系 ---------- */
.m-contact-info{background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:20px 16px;margin:20px 4%;}
.m-contact-info h3{font-size:16px;color:var(--navy);margin-bottom:14px;padding-bottom:10px;border-bottom:2px solid var(--navy);}
.m-contact-info li{display:flex;align-items:center;padding:12px 0;border-bottom:1px dashed var(--line);}
.m-contact-info li b{font-size:13px;color:#2b3a49;display:block;}
.m-contact-info li span{font-size:13px;color:var(--steel-light);}
.m-contact-info .tel{color:var(--accent);font-weight:700;font-size:18px;}
.m-form{background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:20px 16px;margin:0 4% 20px;}
.m-form h3{font-size:16px;color:var(--navy);margin-bottom:14px;padding-bottom:10px;border-bottom:2px solid var(--navy);}
.m-form label{display:block;font-size:12px;color:var(--steel-light);margin-bottom:5px;}
.m-form input,.m-form textarea,.m-form select{width:100%;padding:10px 12px;border:1px solid var(--line);border-radius:6px;font-size:14px;font-family:inherit;margin-bottom:12px;}
.m-form textarea{height:90px;}
.m-form .submit{width:100%;background:var(--accent);color:#fff;border:0;border-radius:6px;padding:12px;font-size:15px;font-weight:600;}

/* ---------- CTA ---------- */
.m-cta{background:linear-gradient(135deg,var(--navy),var(--navy-3));text-align:center;padding:30px 6%;}
.m-cta h3{color:#fff;font-size:18px;font-weight:700;}
.m-cta p{color:#cfd9e6;font-size:12px;margin-top:6px;}
.m-cta .tel{color:var(--accent);font-size:26px;font-weight:800;display:block;margin-top:10px;}

/* ---------- 页脚 ---------- */
.m-footer{background:var(--navy);color:#b6c3d2;font-size:12px;}
.m-footer .cols{padding:26px 5% 14px;display:grid;grid-template-columns:1fr 1fr;gap:20px;}
.m-footer h4{color:#fff;font-size:14px;margin-bottom:10px;padding-bottom:6px;position:relative;}
.m-footer h4::after{content:"";position:absolute;left:0;bottom:0;width:24px;height:2px;background:var(--accent);}
.m-footer ul li{padding:5px 0;}
.m-footer .copy{border-top:1px solid rgba(255,255,255,.1);padding:16px 5%;text-align:center;line-height:1.8;color:#8ea0b4;}

/* ---------- 底部固定联系栏 ---------- */
.m-bar{position:fixed;left:0;right:0;bottom:0;z-index:250;display:flex;height:56px;box-shadow:0 -2px 12px rgba(13,39,66,.12);}
.m-bar a{flex:1;display:flex;align-items:center;justify-content:center;font-size:15px;font-weight:700;color:#fff;}
.m-bar .call{background:var(--accent);}
.m-bar .msg{background:var(--navy);}

/* ---------- 返回顶部 ---------- */
#mToTop{position:fixed;right:16px;bottom:70px;width:40px;height:40px;border-radius:50%;background:var(--accent);color:#fff;border:0;display:none;align-items:center;justify-content:center;z-index:240;box-shadow:0 4px 14px rgba(240,132,26,.4);}
#mToTop.show{display:flex;}


/* ===== 详情页 上/下篇翻页 ===== */
.page-turn{display:flex;gap:14px;margin-top:44px;border-top:1px solid var(--line);padding-top:26px;}
.page-turn a{flex:1;display:flex;flex-direction:column;gap:6px;padding:16px 20px;border:1px solid var(--line);border-radius:10px;background:#fff;transition:.25s;}
.page-turn a span{font-size:13px;color:var(--steel-light);}
.page-turn a b{font-size:16px;color:var(--navy);font-weight:600;}
.page-turn a:hover{border-color:var(--accent);box-shadow:var(--shadow-lg);}
.page-turn a:hover span{color:var(--accent);}
.page-turn a.next{text-align:right;align-items:flex-end;}
.page-turn a.next b{color:var(--accent);}
@media (max-width:760px){.page-turn{flex-direction:column;}}


/* ===== 产品列表 阵列 ===== */
.prod-grid.cat{grid-template-columns:repeat(3,1fr);}
.prod-card.simple a{display:block;text-decoration:none;}
.prod-card.simple .body{padding:14px 16px;text-align:center;border-top:1px solid var(--line);}
.prod-card.simple .body h3{font-size:16px;color:var(--navy);font-weight:600;margin:0;}
.prod-card.simple:hover .body h3{color:var(--accent);}
.prod-card.simple .pic img{transition:.4s;}
.prod-card.simple:hover .pic img{transform:scale(1.05);}
@media(max-width:980px){.prod-grid.cat{grid-template-columns:repeat(2,1fr);}}
@media(max-width:520px){.prod-grid.cat{grid-template-columns:1fr 1fr;}}

/* ===== 分页 ===== */
.pagination{display:flex;justify-content:center;align-items:center;gap:8px;margin-top:40px;flex-wrap:wrap;}
.pagination a,.pagination span{display:inline-flex;min-width:38px;height:38px;padding:0 10px;align-items:center;justify-content:center;border:1px solid var(--line);border-radius:8px;background:#fff;color:var(--steel);font-size:14px;text-decoration:none;transition:.2s;}
.pagination a:hover{border-color:var(--accent);color:var(--accent);}
.pagination .cur{background:var(--navy);color:#fff;border-color:var(--navy);font-weight:600;}
.pagination .info{color:var(--steel-light);border:none;background:transparent;}
.pagination .dot{color:var(--steel-light);border:none;background:transparent;min-width:auto;}



/* ===== 移动端产品阵列 ===== */
.m-prod-grid{display:grid;grid-template-columns:1fr 1fr;gap:12px;list-style:none;margin:0;padding:0;}
.m-prod-cell{background:#fff;border-radius:12px;overflow:hidden;box-shadow:0 6px 18px rgba(13,39,66,.08);}
.m-prod-cell a{display:block;text-decoration:none;}
.m-prod-cell .pic{aspect-ratio:1/1;overflow:hidden;}
.m-prod-cell .pic img{width:100%;height:100%;object-fit:cover;transition:.4s;}
.m-prod-cell:hover .pic img{transform:scale(1.05);}
.m-prod-cell h3{font-size:14px;color:var(--navy);padding:11px 8px 13px;text-align:center;margin:0;font-weight:600;}
.m-prod-cell:hover h3{color:var(--accent);}


/* ===== 移动端文章元信息 ===== */
.m-meta{color:var(--steel-light);font-size:13px;padding-bottom:14px;margin:0 0 16px;border-bottom:1px dashed var(--line);}

/* ===== 阿里巴巴普惠体（自托管） ===== */
@font-face{font-family:'Alibaba PuHuiTi';src:url('../../fonts/puhuiti-regular.woff2') format('woff2');font-weight:400;font-style:normal;font-display:swap;}
@font-face{font-family:'Alibaba PuHuiTi';src:url('../../fonts/puhuiti-medium.woff2') format('woff2');font-weight:500;font-style:normal;font-display:swap;}

/* ===== 移动端首页 banner 三图轮播 ===== */
.m-hero{position:relative;overflow:hidden;}
.m-track{position:relative;}
.m-slide{position:relative;opacity:0;visibility:hidden;transition:opacity .9s ease;}
.m-slide.active{opacity:1;visibility:visible;}
.m-slide img{width:100%;height:230px;object-fit:cover;transform:scale(1.12);transition:transform 7s linear;display:block;}
.m-slide.active img{transform:scale(1);}
.m-slide .m-mask{position:absolute;inset:0;background:linear-gradient(180deg,rgba(13,39,66,.55),rgba(13,39,66,.82));}
.m-slide .m-cap{position:absolute;left:0;right:0;bottom:0;padding:20px 5%;color:#fff;z-index:2;}
.m-slide .m-cap h1{font-size:22px;font-weight:800;line-height:1.45;display:block;opacity:0;transform:translateY(16px);transition:opacity .7s ease,transform .7s ease;}
.m-slide.active .m-cap h1{opacity:1;transform:none;transition-delay:.25s;}
.m-slide .m-cap p{font-size:13px;color:#d8e2ee;margin-top:8px;opacity:0;transform:translateY(16px);transition:opacity .7s ease,transform .7s ease;}
.m-slide.active .m-cap p{opacity:1;transform:none;transition-delay:.45s;}
.m-slide .m-cap h1,.m-slide .m-cap p{font-family:'Alibaba PuHuiTi','PingFang SC','Microsoft YaHei',sans-serif;}
.m-dots{position:absolute;bottom:10px;right:6%;z-index:3;display:flex;gap:7px;}
.m-dots .m-dot{width:18px;height:5px;border:none;border-radius:3px;background:rgba(255,255,255,.5);cursor:pointer;transition:.3s;}
.m-dots .m-dot.active{background:var(--accent);width:26px;}

/* ===== 移动端资讯/知识列表整行可点 ===== */
.m-news li{display:block;padding:0;border-bottom:1px solid var(--line);}
.m-news .m-news-link{display:flex;gap:12px;padding:12px 4%;align-items:flex-start;color:inherit;text-decoration:none;}
.m-news .m-news-link:active{background:#f5f7fa;}
.m-know a{text-decoration:none;}
.m-know a:active,.m-know a:hover{opacity:.65;}