/* 枣强东燃气调压器 官网样式 zdtyq.com */
:root{
  --brand:#0d3b66;        /* 工业蓝 主色 */
  --brand-d:#092c4d;
  --accent:#e8590c;       /* 警示橙 强调 */
  --accent-d:#c94a06;
  --ink:#1c2430;
  --ink2:#4a5568;
  --ink3:#7b8494;
  --line:#e4e8ef;
  --bg:#ffffff;
  --bg2:#f5f7fa;
  --ok:#1f7a4d;
  --warn:#b7791f;
}
*{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth}
body{
  font-family:"PingFang SC","Microsoft YaHei","Hiragino Sans GB",Arial,sans-serif;
  color:var(--ink); background:var(--bg); line-height:1.75;
  font-size:15px; -webkit-font-smoothing:antialiased;
}
img{max-width:100%;display:block}
a{color:inherit;text-decoration:none}
ul{list-style:none}
.wrap{max-width:1200px;margin:0 auto;padding:0 20px}

/* ---------- 顶部条 ---------- */
.topbar{background:var(--brand-d);color:#c9d6e4;font-size:13px}
.topbar .wrap{display:flex;justify-content:space-between;align-items:center;height:38px;gap:16px;flex-wrap:wrap}
.topbar a{color:#c9d6e4}
.topbar a:hover{color:#fff}
.topbar .tel{color:#ffb37a;font-weight:700}

/* ---------- 导航 ---------- */
header{background:#fff;border-bottom:1px solid var(--line);position:sticky;top:0;z-index:50}
header .wrap{display:flex;align-items:center;justify-content:space-between;height:72px;gap:20px}
.logo{display:flex;align-items:center;gap:12px;flex:0 0 auto}
.logo .mark{
  width:44px;height:44px;border-radius:6px;background:var(--brand);color:#fff;
  display:flex;align-items:center;justify-content:center;font-weight:800;font-size:15px;letter-spacing:0;
  flex-direction:column;line-height:1.05;
}
.logo .mark span{font-size:9px;font-weight:500;opacity:.85}
.logo .txt b{display:block;font-size:18px;letter-spacing:.5px;color:var(--brand)}
.logo .txt i{display:block;font-style:normal;font-size:11.5px;color:var(--ink3);letter-spacing:2px}
nav{display:flex;gap:4px;align-items:center}
nav a{
  padding:9px 14px;border-radius:5px;font-size:15px;color:var(--ink);white-space:nowrap;
}
nav a:hover{background:var(--bg2);color:var(--brand)}
nav a.on{color:var(--brand);font-weight:700;background:#eef3f9}
.nav-btn{
  background:var(--accent);color:#fff!important;padding:9px 18px!important;border-radius:5px;font-weight:600;
}
.nav-btn:hover{background:var(--accent-d)}
.burger{display:none;background:none;border:1px solid var(--line);border-radius:5px;
  width:42px;height:38px;cursor:pointer;font-size:18px;color:var(--brand)}

/* ---------- 通用区块 ---------- */
section{padding:64px 0}
.sec-head{text-align:center;margin-bottom:38px}
.sec-head h2{font-size:27px;letter-spacing:.5px;margin-bottom:10px;color:var(--ink)}
.sec-head p{color:var(--ink3);font-size:14.5px}
.sec-head .bar{width:52px;height:3px;background:var(--accent);margin:14px auto 0}
.bg-gray{background:var(--bg2)}
.bg-brand{background:var(--brand);color:#fff}
.bg-brand .sec-head h2{color:#fff}
.bg-brand .sec-head p{color:#b9cbe0}

/* ---------- 首屏 ---------- */
.hero{
  background:linear-gradient(120deg,#0d3b66 0%,#12497d 55%,#1a5c96 100%);
  color:#fff;padding:78px 0 62px;position:relative;overflow:hidden;
}
.hero::after{
  content:"";position:absolute;right:-80px;top:-60px;width:520px;height:520px;
  background:radial-gradient(circle,rgba(232,89,12,.22),transparent 65%);
}
.hero .wrap{position:relative;z-index:2;display:grid;grid-template-columns:1.15fr .85fr;gap:44px;align-items:center}
.hero h1{font-size:36px;line-height:1.35;margin-bottom:14px;letter-spacing:.5px}
.hero h1 em{font-style:normal;color:#ffb37a}
.hero .sub{font-size:16px;color:#c7d9ec;margin-bottom:8px}
.hero .tags{display:flex;flex-wrap:wrap;gap:8px;margin:20px 0 26px}
.hero .tags span{background:rgba(255,255,255,.13);border:1px solid rgba(255,255,255,.22);
  padding:5px 12px;border-radius:20px;font-size:13px}
.hero .btns{display:flex;gap:12px;flex-wrap:wrap}
.btn{display:inline-block;padding:13px 30px;border-radius:5px;font-size:15.5px;font-weight:600;transition:.2s}
.btn-o{background:var(--accent);color:#fff}
.btn-o:hover{background:var(--accent-d)}
.btn-g{background:rgba(255,255,255,.1);color:#fff;border:1px solid rgba(255,255,255,.4)}
.btn-g:hover{background:rgba(255,255,255,.2)}
.hero-card{background:rgba(255,255,255,.07);border:1px solid rgba(255,255,255,.18);
  border-radius:10px;padding:26px 24px;backdrop-filter:blur(3px)}
.hero-card h3{font-size:16px;margin-bottom:16px;color:#ffb37a}
.hero-card ul li{padding:9px 0;border-bottom:1px dashed rgba(255,255,255,.16);font-size:14px;color:#dbe7f3}
.hero-card ul li:last-child{border:none}
.hero-card ul li b{color:#fff}

/* ---------- 信任四格 ---------- */
.trust{display:grid;grid-template-columns:repeat(4,1fr);gap:18px}
.trust .t{background:#fff;border:1px solid var(--line);border-radius:8px;padding:24px 22px;transition:.2s}
.trust .t:hover{border-color:var(--brand);transform:translateY(-3px);box-shadow:0 6px 20px rgba(13,59,102,.09)}
.trust .t .ic{width:40px;height:40px;border-radius:8px;background:#eef3f9;color:var(--brand);
  display:flex;align-items:center;justify-content:center;font-size:19px;font-weight:700;margin-bottom:14px}
.trust .t h4{font-size:16px;margin-bottom:7px}
.trust .t p{font-size:13.5px;color:var(--ink2);line-height:1.7}

/* ---------- 产品卡 ---------- */
.prods{display:grid;grid-template-columns:repeat(3,1fr);gap:20px}
.prod{background:#fff;border:1px solid var(--line);border-radius:8px;overflow:hidden;transition:.2s;display:flex;flex-direction:column}
.prod:hover{box-shadow:0 8px 26px rgba(13,59,102,.12);transform:translateY(-3px)}
.prod .pic{height:190px;background:linear-gradient(135deg,#eef2f7,#dfe6ef);display:flex;
  align-items:center;justify-content:center;color:var(--ink3);font-size:13px;text-align:center;padding:16px;border-bottom:1px solid var(--line)}
.prod .bd{padding:18px 20px 20px;flex:1;display:flex;flex-direction:column}
.prod h3{font-size:17px;margin-bottom:8px;color:var(--brand)}
.prod p{font-size:13.5px;color:var(--ink2);flex:1;margin-bottom:12px}
.prod .more{color:var(--accent);font-size:13.5px;font-weight:600}

/* ---------- 场景 ---------- */
.scenes{display:grid;grid-template-columns:repeat(4,1fr);gap:14px}
.scene{position:relative;border-radius:8px;overflow:hidden;background:#eef2f7;
  height:132px;display:flex;align-items:flex-end;padding:14px;border:1px solid var(--line)}
.scene span{font-size:14px;font-weight:600;color:var(--brand);
  background:rgba(255,255,255,.92);padding:4px 10px;border-radius:4px}

/* ---------- 优势 ---------- */
.why{display:grid;grid-template-columns:repeat(2,1fr);gap:22px}
.why .w{background:#fff;border:1px solid var(--line);border-left:4px solid var(--accent);
  border-radius:6px;padding:22px 24px}
.why .w h4{font-size:16.5px;margin-bottom:8px;color:var(--brand)}
.why .w p{font-size:14px;color:var(--ink2)}

/* ---------- FAQ ---------- */
.faq{max-width:900px;margin:0 auto}
.faq .q{border:1px solid var(--line);border-radius:6px;margin-bottom:12px;background:#fff;overflow:hidden}
.faq .q .hd{padding:16px 20px;cursor:pointer;font-weight:600;font-size:15.5px;display:flex;
  justify-content:space-between;align-items:center;gap:14px}
.faq .q .hd:hover{background:var(--bg2)}
.faq .q .hd::after{content:"+";color:var(--accent);font-size:20px;font-weight:700;flex:0 0 auto}
.faq .q.open .hd::after{content:"−"}
.faq .q .bd{display:none;padding:0 20px 18px;font-size:14.5px;color:var(--ink2);border-top:1px dashed var(--line);padding-top:14px}
.faq .q.open .bd{display:block}

/* ---------- 表格 ---------- */
table{width:100%;border-collapse:collapse;font-size:14px;background:#fff}
table th{background:var(--brand);color:#fff;text-align:left;padding:12px 14px;font-weight:600;font-size:14px}
table td{padding:11px 14px;border-bottom:1px solid var(--line);vertical-align:top}
table tr:last-child td{border-bottom:none}
table tbody tr:nth-child(even){background:#fafbfd}
.tbl-wrap{overflow-x:auto;border:1px solid var(--line);border-radius:8px}

/* ---------- 资质 ---------- */
.certs{display:grid;grid-template-columns:repeat(4,1fr);gap:16px}
.cert{border:1px dashed var(--line);border-radius:8px;background:#fff;
  height:160px;display:flex;flex-direction:column;align-items:center;justify-content:center;
  color:var(--ink3);font-size:13px;text-align:center;padding:14px}
.cert b{color:var(--ink2);font-size:14px;margin-bottom:6px}

/* ---------- 表单 ---------- */
.form{background:#fff;border:1px solid var(--line);border-radius:10px;padding:28px}
.form .row{display:grid;grid-template-columns:1fr 1fr;gap:14px;margin-bottom:14px}
.form label{display:block;font-size:13.5px;color:var(--ink2);margin-bottom:6px}
.form input,.form select,.form textarea{
  width:100%;padding:11px 12px;border:1px solid var(--line);border-radius:5px;
  font-size:14.5px;font-family:inherit;background:#fff;color:var(--ink)
}
.form input:focus,.form select:focus,.form textarea:focus{outline:none;border-color:var(--brand)}
.form textarea{min-height:96px;resize:vertical}
.form .btn{margin-top:8px;border:none;cursor:pointer;width:100%}
.form .tip{font-size:12.5px;color:var(--ink3);margin-top:12px;line-height:1.7}

/* ---------- 联系 ---------- */
.contact{display:grid;grid-template-columns:1fr 1fr;gap:34px;align-items:start}
.cinfo .i{display:flex;gap:14px;padding:16px 0;border-bottom:1px dashed var(--line)}
.cinfo .i:last-child{border:none}
.cinfo .i .k{flex:0 0 74px;color:var(--ink3);font-size:13.5px;padding-top:2px}
.cinfo .i .v{font-size:15px}
.cinfo .i .v b{color:var(--accent);font-size:19px;letter-spacing:.5px}

/* ---------- 面包屑 ---------- */
.crumb{background:var(--bg2);border-bottom:1px solid var(--line);font-size:13px;color:var(--ink3)}
.crumb .wrap{padding:14px 20px}
.crumb a{color:var(--ink3)}
.crumb a:hover{color:var(--brand)}

/* ---------- 内容页 ---------- */
.page{padding:46px 0 66px}
.page h1{font-size:28px;margin-bottom:14px;color:var(--brand)}
.page h2{font-size:21px;margin:38px 0 14px;padding-left:12px;border-left:4px solid var(--accent)}
.page h3{font-size:17px;margin:24px 0 10px;color:var(--ink)}
.page p{margin-bottom:14px;color:var(--ink2);font-size:15px}
.page ul{margin:0 0 16px 2px}
.page ul li{padding:7px 0 7px 22px;position:relative;color:var(--ink2);font-size:15px}
.page ul li::before{content:"";position:absolute;left:4px;top:16px;width:6px;height:6px;
  border-radius:50%;background:var(--accent)}
.lead{font-size:16px;color:var(--ink2);background:var(--bg2);border-left:4px solid var(--brand);
  padding:16px 20px;border-radius:0 6px 6px 0;margin-bottom:26px}

.note{background:#fff8ec;border:1px solid #f0d9a8;border-radius:6px;padding:14px 18px;
  font-size:14px;color:#7a5a09;margin:20px 0}
.note b{color:#5c4305}
.safety{background:#fdeceb;border:1px solid #f3c9c5;border-radius:6px;padding:14px 18px;
  font-size:14px;color:#8f211b;margin:24px 0}
.safety b{color:#7a1a15}

/* ---------- 资讯列表 ---------- */
.news{display:grid;grid-template-columns:1fr;gap:16px}
.news .n{display:grid;grid-template-columns:110px 1fr;gap:20px;background:#fff;
  border:1px solid var(--line);border-radius:8px;padding:18px 20px;transition:.2s}
.news .n:hover{border-color:var(--brand);box-shadow:0 5px 18px rgba(13,59,102,.08)}
.news .n .d{flex:0 0 auto;color:var(--ink3);font-size:13px;padding-top:3px}
.news .n .d b{display:block;font-size:24px;color:var(--brand);line-height:1.2}
.news .n h3{font-size:16.5px;margin-bottom:6px;color:var(--ink)}
.news .n p{font-size:13.8px;color:var(--ink3)}

/* ---------- 页脚 ---------- */
footer{background:#0b2740;color:#9fb3c8;font-size:14px;padding:46px 0 0;margin-top:0}
footer .fg{display:grid;grid-template-columns:1.4fr 1fr 1fr 1.2fr;gap:34px;padding-bottom:34px}
footer h4{color:#fff;font-size:15.5px;margin-bottom:16px;letter-spacing:.5px}
footer ul li{padding:6px 0}
footer ul li a:hover{color:#ffb37a}
footer .fcontact b{display:block;color:#ffb37a;font-size:20px;margin-bottom:8px;letter-spacing:.5px}
footer .fcontact p{line-height:1.9}
.fbottom{border-top:1px solid #16344f;padding:18px 0;text-align:center;font-size:12.5px;color:#6f8499}
.fbottom a{color:#6f8499}

/* ---------- 悬浮工具 ---------- */
.fix{position:fixed;right:16px;bottom:16px;z-index:60;display:flex;flex-direction:column;gap:10px}
.fix a{width:50px;height:50px;border-radius:50%;display:flex;align-items:center;justify-content:center;
  color:#fff;font-size:12px;text-align:center;line-height:1.25;box-shadow:0 4px 14px rgba(0,0,0,.18)}
.fix .tel{background:var(--accent)}
.fix .top{background:#3b4a5c;font-size:16px;opacity:0;pointer-events:none;transition:.2s}
.fix .top.show{opacity:1;pointer-events:auto}

/* ---------- 占位图说明 ---------- */
.ph{
  background:repeating-linear-gradient(45deg,#eef2f7,#eef2f7 10px,#e6ebf2 10px,#e6ebf2 20px);
  border:1px dashed #c3ccd8;color:#8a95a6;font-size:12.5px;
  display:flex;align-items:center;justify-content:center;text-align:center;border-radius:6px;
}

/* ---------- 响应式 ---------- */
@media(max-width:1000px){
  .hero .wrap{grid-template-columns:1fr}
  .hero h1{font-size:28px}
  .trust,.certs{grid-template-columns:repeat(2,1fr)}
  .prods,.scenes{grid-template-columns:repeat(2,1fr)}
  .why{grid-template-columns:1fr}
  footer .fg{grid-template-columns:1fr 1fr}
}
@media(max-width:760px){
  nav{display:none;position:absolute;top:72px;left:0;right:0;background:#fff;
    border-bottom:1px solid var(--line);flex-direction:column;padding:10px 0;gap:0;
    box-shadow:0 8px 20px rgba(0,0,0,.08)}
  nav.show{display:flex}
  nav a{padding:13px 20px;width:100%;border-radius:0}
  .burger{display:block}
  section{padding:44px 0}
  .sec-head h2{font-size:22px}
  .trust,.prods,.scenes,.certs{grid-template-columns:1fr}
  .contact,.form .row{grid-template-columns:1fr}
  .news .n{grid-template-columns:1fr;gap:8px}
  .news .n .d{display:flex;gap:8px;align-items:baseline}
  footer .fg{grid-template-columns:1fr}
  .hero{padding:52px 0 44px}
  .page h1{font-size:23px}
}