/* ===================================================================
   盛鸿建设 / MetalMadeX — 净化工程产品站
   设计基调：工程图纸感 —— 藏青 + 洁净蓝，数据表式卡片，无圆角无阴影
   =================================================================== */

:root{
  --navy-900:#081a2e;
  --navy-800:#0f2c4c;
  --navy-700:#163a5f;
  --navy-600:#1d4970;
  --steel-700:#3d4a58;
  --steel-600:#5b6774;
  --steel-400:#8b95a1;
  --steel-300:#c3ccd4;
  --steel-150:#e3e8ec;
  --steel-100:#eef1f4;
  --paper:#ffffff;
  --accent-500:#1f8fce;
  --accent-600:#146a9c;
  --accent-100:#e4f2fa;
  --ink:#16232f;
  --warn:#c85a2e;

  --font: -apple-system, BlinkMacSystemFont, "PingFang SC", "Microsoft YaHei",
          "Heiti SC", "Segoe UI", Arial, sans-serif;

  --maxw: 1180px;
}

*{ box-sizing:border-box; }
html{ scroll-behavior:smooth; }
body{
  margin:0;
  font-family:var(--font);
  color:var(--ink);
  background:var(--paper);
  line-height:1.65;
  -webkit-font-smoothing:antialiased;
}
img{ max-width:100%; display:block; }
a{ color:inherit; text-decoration:none; }
ul{ margin:0; padding:0; list-style:none; }
h1,h2,h3,h4{ margin:0; font-weight:700; letter-spacing:.01em; }
p{ margin:0; }

.wrap{
  max-width:var(--maxw);
  margin:0 auto;
  padding:0 28px;
}

/* ---------- 顶部导航 ---------- */
.topbar{
  background:var(--navy-900);
  color:var(--steel-300);
  font-size:13px;
}
.topbar .wrap{
  display:flex; justify-content:space-between; align-items:center;
  height:34px;
}
.topbar a{ color:var(--steel-300); }
.topbar a:hover{ color:var(--paper); }
.topbar .tel{ color:var(--paper); font-weight:600; letter-spacing:.02em; }

header.mainnav{
  background:var(--navy-800);
  border-bottom:3px solid var(--accent-500);
  position:sticky; top:0; z-index:50;
}
header.mainnav .wrap{
  display:flex; align-items:center; justify-content:space-between;
  height:76px;
}
.brand{ display:flex; align-items:center; flex:0 0 auto; color:var(--paper); }
.brand-logo{
  display:block;
  height:62px;
  width:auto;
  max-width:190px;
  object-fit:contain;
}

nav.primary ul{ display:flex; gap:2px; }
nav.primary a{
  display:block;
  padding:10px 16px;
  color:var(--steel-150);
  font-size:15px;
  border-bottom:2px solid transparent;
  transition:color .15s, border-color .15s;
  white-space:nowrap;
}
nav.primary a:hover{ color:var(--paper); border-color:var(--accent-500); }
nav.primary a.active{ color:var(--paper); border-color:var(--accent-500); font-weight:600; }

.nav-toggle{ display:none; }

/* ---------- 页头条幅（子页） ---------- */
.pagehead{
  background:var(--navy-800);
  color:var(--paper);
  padding:52px 0 40px;
  position:relative;
  overflow:hidden;
}
.pagehead::before{
  content:"";
  position:absolute; inset:0;
  background-image:
    linear-gradient(var(--navy-700) 1px, transparent 1px),
    linear-gradient(90deg, var(--navy-700) 1px, transparent 1px);
  background-size:34px 34px;
  opacity:.25;
}
.pagehead .wrap{ position:relative; }
.pagehead .eyebrow{
  color:var(--accent-500); font-size:13px; letter-spacing:.14em; margin-bottom:10px;
  font-weight:600;
}
.pagehead h1{ font-size:32px; }
.pagehead .sub{
  color:var(--steel-300); margin-top:12px; max-width:640px; font-size:15px;
}
.pagehead .breadcrumb{
  margin-top:22px; font-size:13px; color:var(--steel-400);
}
.pagehead .breadcrumb a:hover{ color:var(--paper); }

/* ---------- 首页 Hero ---------- */
.hero{
  background:var(--navy-800);
  color:var(--paper);
  position:relative;
  overflow:hidden;
}
.hero::before{
  content:"";
  position:absolute; inset:0;
  background-image:
    linear-gradient(var(--navy-700) 1px, transparent 1px),
    linear-gradient(90deg, var(--navy-700) 1px, transparent 1px);
  background-size:38px 38px;
  opacity:.22;
}
.hero .wrap{
  position:relative;
  display:grid; grid-template-columns:1.05fr .95fr; gap:40px;
  padding:76px 28px 64px;
  align-items:center;
}
.hero-eyebrow{
  color:var(--accent-500); font-size:13px; letter-spacing:.14em; font-weight:600; margin-bottom:16px;
}
.hero h1{
  font-size:40px; line-height:1.3;
}
.hero h1 .line2{ color:var(--steel-300); font-weight:600; font-size:22px; display:block; margin-top:10px; }
.hero p.lead{
  margin-top:20px; color:var(--steel-300); font-size:16px; max-width:480px;
}
.hero .cta-row{ margin-top:30px; display:flex; gap:14px; flex-wrap:wrap; }
.btn{
  display:inline-block; padding:13px 26px; font-size:15px; font-weight:600;
  border:1.5px solid transparent; transition:background .15s,border-color .15s,color .15s;
}
.btn-accent{ background:var(--accent-500); color:var(--paper); }
.btn-accent:hover{ background:var(--accent-600); }
.btn-outline{ border-color:var(--steel-400); color:var(--paper); }
.btn-outline:hover{ border-color:var(--paper); }
.btn-taobao{ background:#ff5a1f; border-color:#ff5a1f; color:var(--paper); }
.btn-taobao:hover{ background:#e94b12; border-color:#e94b12; }

.hero-diagram{ position:relative; }
.hero-diagram svg{ width:100%; height:auto; }

.hero-diagram .hero-showcase-image{
  width:100%;
  height:auto;
  display:block;
}

/* stat strip */
.statstrip{ background:var(--navy-900); color:var(--steel-300); }
.statstrip .wrap{
  display:flex; justify-content:space-between; padding:22px 28px;
  flex-wrap:wrap; gap:18px;
}
.statstrip .stat{ text-align:left; }
.statstrip .stat b{ display:block; font-size:24px; color:var(--paper); font-weight:700; }
.statstrip .stat span{ font-size:13px; }

/* ---------- 通用 section ---------- */
section{ padding:64px 0; }
section.alt{ background:var(--steel-100); }
.section-head{ max-width:640px; margin-bottom:38px; }
.section-head .kicker{
  color:var(--accent-600); font-size:13px; font-weight:700; letter-spacing:.1em; margin-bottom:8px;
}
.section-head h2{ font-size:27px; }
.section-head p{ color:var(--steel-600); margin-top:12px; font-size:15px; }

/* ---------- 频道入口网格（首页）---------- */
.channels-grid{
  display:grid; grid-template-columns:repeat(4,1fr); gap:1px;
  background:var(--steel-300);
  border:1px solid var(--steel-300);
}
.channel-card{
  background:var(--paper); padding:26px 22px; position:relative;
  transition:background .15s;
}
.channel-card:hover{ background:var(--accent-100); }
.channel-card .icon{ width:34px; height:34px; color:var(--navy-800); margin-bottom:16px; }
.channel-card:hover .icon{ color:var(--accent-600); }
.channel-card h3{ font-size:16px; margin-bottom:6px; }
.channel-card p{ font-size:13px; color:var(--steel-600); }
.channel-card .go{
  margin-top:14px; font-size:13px; color:var(--accent-600); font-weight:600;
}

/* ---------- 产品数据卡（子页）---------- */
.product-grid{
  display:grid; grid-template-columns:repeat(2,1fr); gap:22px;
}
.product-card{
  border:1px solid var(--steel-300);
  background:var(--paper);
  position:relative;
  padding:26px 26px 24px;
}
.product-card::before,.product-card::after{
  content:""; position:absolute; width:12px; height:12px;
  border-color:var(--accent-500); border-style:solid;
}
.product-card::before{ top:-1px; left:-1px; border-width:2px 0 0 2px; }
.product-card::after{ bottom:-1px; right:-1px; border-width:0 2px 2px 0; }
.product-card .thumb{
  margin:-26px -26px 18px;
  background:var(--steel-100);
  border-bottom:1px solid var(--steel-300);
  overflow:hidden;
  aspect-ratio:1 / 1;
}
.product-card .thumb svg{ width:100%; height:100%; display:block; object-fit:cover; }
.product-card .tag{
  display:inline-block; font-size:11px; letter-spacing:.08em; color:var(--accent-600);
  border:1px solid var(--accent-500); padding:2px 8px; margin-bottom:14px;
}
.product-card h3{ font-size:19px; margin-bottom:10px; }
.product-card .desc{ color:var(--steel-600); font-size:14px; margin-bottom:16px; }
.product-card .specs{ border-top:1px dashed var(--steel-300); padding-top:14px; }
.product-card .specs div{
  display:flex; justify-content:space-between; font-size:13px; padding:5px 0;
  border-bottom:1px dotted var(--steel-150);
}
.product-card .specs div span:first-child{ color:var(--steel-600); }
.product-card .specs div span:last-child{ color:var(--ink); font-weight:600; text-align:right; }

/* ---------- 场景 / 认证条 ---------- */
.pill-row{ display:flex; flex-wrap:wrap; gap:10px; }
.pill{
  border:1px solid var(--steel-300); padding:8px 16px; font-size:13.5px; color:var(--steel-700);
  background:var(--paper);
}

/* ---------- 流程步骤（净化设计页） ---------- */
.process{
  display:grid; grid-template-columns:repeat(4,1fr); gap:0;
  border-top:1px solid var(--steel-300);
  border-left:1px solid var(--steel-300);
}
.process .step{
  border-right:1px solid var(--steel-300); border-bottom:1px solid var(--steel-300);
  padding:24px 22px; background:var(--paper);
}
.process .step .num{
  font-size:13px; color:var(--accent-600); font-weight:700; margin-bottom:10px;
}
.process .step h4{ font-size:15.5px; margin-bottom:8px; }
.process .step p{ font-size:13px; color:var(--steel-600); }

/* ---------- CTA 条 ---------- */
.cta-band{
  background:var(--navy-800); color:var(--paper);
  padding:46px 0;
}
.cta-band .wrap{
  display:flex; justify-content:space-between; align-items:center; gap:24px; flex-wrap:wrap;
}
.cta-band h3{ font-size:22px; }
.cta-band p{ color:var(--steel-300); margin-top:8px; font-size:14px; }

/* ---------- 关于我们专用 ---------- */
.info-table{ width:100%; border-collapse:collapse; }
.info-table tr{ border-bottom:1px solid var(--steel-150); }
.info-table td{ padding:12px 0; font-size:14.5px; }
.info-table td:first-child{ color:var(--steel-600); width:130px; }
.timeline{ border-left:2px solid var(--steel-300); padding-left:24px; }
.timeline .item{ margin-bottom:26px; position:relative; }
.timeline .item::before{
  content:""; position:absolute; left:-30px; top:4px; width:9px; height:9px;
  background:var(--accent-500);
}
.timeline .item b{ display:block; color:var(--navy-800); font-size:15px; margin-bottom:4px; }
.timeline .item span{ font-size:13.5px; color:var(--steel-600); }

/* ---------- 页脚 ---------- */
footer{ background:var(--navy-900); color:var(--steel-300); padding:52px 0 22px; }
.foot-grid{
  display:grid; grid-template-columns:1.4fr 1fr 1fr 1fr; gap:32px;
  padding-bottom:34px; border-bottom:1px solid var(--navy-700);
}
.foot-grid h4{ color:var(--paper); font-size:14.5px; margin-bottom:16px; }
.foot-grid p{ font-size:13.5px; color:var(--steel-400); line-height:1.8; }
.foot-grid ul li{ margin-bottom:9px; font-size:13.5px; }
.foot-grid ul a:hover{ color:var(--paper); }
.foot-bottom{
  padding-top:20px; font-size:12.5px; color:var(--steel-400);
  display:flex; justify-content:space-between; flex-wrap:wrap; gap:8px;
}
.foot-bottom a{ color:inherit; text-decoration:none; }
.foot-bottom a:hover{ color:var(--paper); }

/* ---------- 响应式 ---------- */
@media (max-width: 980px){
  nav.primary{ display:none; }
  .hero .wrap{ grid-template-columns:1fr; padding-top:52px; }
  .hero h1{ font-size:31px; }
  .channels-grid{ grid-template-columns:repeat(2,1fr); }
  .product-grid{ grid-template-columns:1fr; }
  .process{ grid-template-columns:repeat(2,1fr); }
  .foot-grid{ grid-template-columns:1fr 1fr; }
  .statstrip .wrap{ justify-content:flex-start; gap:34px; }
}
@media (max-width: 560px){
  .channels-grid{ grid-template-columns:1fr; }
  .process{ grid-template-columns:1fr; }
  .foot-grid{ grid-template-columns:1fr; }
  .pagehead h1{ font-size:25px; }
}

/* 产品图片独立管理：以后只需替换 images/ 下同名 JPG/PNG 文件。 */
.product-card .thumb img{
  width:100%;
  height:100%;
  display:block;
  object-fit:cover;
}
.product-card .thumb img.contain{ object-fit:contain; }

/* ---------- 产品双图切换 ---------- */
.thumb-gallery{
  position:relative;
}
.thumb-gallery .gallery-image{
  position:absolute;
  inset:0;
  width:100%;
  height:100%;
  object-fit:cover;
  opacity:0;
  visibility:hidden;
  transition:opacity .2s ease, visibility .2s ease;
}
.thumb-gallery .gallery-image.active{
  opacity:1;
  visibility:visible;
}
.thumb-gallery .thumb-pager{
  position:absolute;
  right:12px;
  bottom:12px;
  z-index:4;
  display:flex;
  gap:6px;
}
.thumb-gallery .thumb-pager button{
  width:26px;
  height:26px;
  padding:0;
  border:1px solid rgba(255,255,255,.92);
  background:rgba(8,26,46,.72);
  color:#fff;
  font:600 12px/24px var(--font);
  text-align:center;
  cursor:pointer;
  transition:background .15s ease, border-color .15s ease, transform .15s ease;
}
.thumb-gallery .thumb-pager button:hover{
  background:rgba(31,143,206,.9);
}
.thumb-gallery .thumb-pager button.active{
  background:var(--accent-500);
  border-color:var(--accent-500);
}
.thumb-gallery .thumb-pager button:focus-visible{
  outline:2px solid #fff;
  outline-offset:2px;
}



@media (max-width: 760px){
  .brand-logo{ height:52px; max-width:155px; }
}


/* ---------- 联系表单 ---------- */
.contact-form{
  border-top:1px solid var(--steel-300);
}
.contact-form .form-row{
  display:grid;
  grid-template-columns:150px minmax(0,1fr);
  gap:24px;
  align-items:center;
  padding:15px 0;
  border-bottom:1px solid var(--steel-300);
}
.contact-form label{
  font-size:14px;
  color:var(--steel-700);
}
.contact-form .required{ color:var(--accent-600); }
.contact-form input,
.contact-form textarea{
  width:100%;
  border:1px solid var(--steel-300);
  background:#fff;
  color:var(--ink);
  font:inherit;
  font-size:14px;
  padding:12px 14px;
  outline:none;
  transition:border-color .15s ease, box-shadow .15s ease;
}
.contact-form textarea{
  resize:vertical;
  min-height:126px;
  line-height:1.7;
}
.contact-form input:focus,
.contact-form textarea:focus{
  border-color:var(--accent-500);
  box-shadow:0 0 0 3px rgba(31,143,206,.12);
}
.contact-form input::placeholder,
.contact-form textarea::placeholder{ color:var(--steel-400); }
.contact-form .form-row-textarea{ align-items:start; }
.contact-form .form-row-textarea label{ padding-top:11px; }
.form-actions{
  display:flex;
  align-items:center;
  gap:14px;
  flex-wrap:wrap;
  padding-top:20px;
}
.form-submit{ border:0; cursor:pointer; }
.form-note{ font-size:12px; color:var(--steel-500); }
.form-honeypot{
  position:absolute !important;
  left:-9999px !important;
  width:1px !important;
  height:1px !important;
  overflow:hidden !important;
}
@media (max-width:760px){
  .contact-form .form-row{ grid-template-columns:1fr; gap:7px; }
  .contact-form .form-row-textarea label{ padding-top:0; }
}


.footer-qr-wrap{
  margin-top:14px;
}
.footer-qr{
  width:180px;
  max-width:100%;
  aspect-ratio:1 / 1;
  display:block;
  background:#fff;
  padding:6px;
  border:1px solid rgba(255,255,255,.12);
}


/* Bilingual language switch */
.lang-switch{
  display:inline-flex;align-items:center;justify-content:center;
  min-width:72px;padding:5px 12px;margin-left:14px;
  border:1px solid rgba(255,255,255,.34);border-radius:999px;
  color:#fff!important;font-weight:700;font-size:13px;line-height:1.2;
  text-decoration:none;transition:.2s ease;white-space:nowrap;
}
.lang-switch:hover{border-color:var(--accent-500);background:rgba(255,255,255,.08);}
html[lang="en"] nav.primary a{font-size:13px;padding-left:8px;padding-right:8px;white-space:nowrap;}
@media (max-width:560px){.topbar .wrap{gap:8px;flex-wrap:wrap;height:auto;min-height:34px;padding-top:4px;padding-bottom:4px}.lang-switch{margin-left:0}}

/* 2026-09-12 topbar spacing refinement: keep hotline away from language switch */
.topbar .wrap > span:first-child{
  flex:0 1 auto;
}
.topbar .wrap > span:nth-child(2){
  margin-left:32px;
  margin-right:auto;
  white-space:nowrap;
}
.topbar .lang-switch{
  margin-left:0;
  flex:0 0 auto;
}
@media (max-width:760px){
  .topbar .wrap > span:nth-child(2){
    margin-left:12px;
    margin-right:auto;
  }
}
@media (max-width:560px){
  .topbar .wrap > span:nth-child(2){
    margin-left:0;
    margin-right:0;
  }
}