*{
  box-sizing:border-box;
}

html{
  scroll-behavior:smooth;
}

body{
  margin:0;
  font-family:"Microsoft YaHei","PingFang SC",Arial,sans-serif;
  color:#263544;
  background:#fff;
}

a{
  color:inherit;
  text-decoration:none;
}

img{
  display:block;
  max-width:100%;
}

.container{
  width:min(1200px,92%);
  margin:auto;
}

.topbar{
  height:38px;
  background:#f4f6f8;
  color:#6d7883;
  font-size:13px;
}

.topbar-inner{
  height:38px;
  display:flex;
  align-items:center;
  justify-content:space-between;
}

.topbar strong{
  color:#1767a0;
}

.header{
  background:#fff;
  position:relative;
  z-index:50;
  box-shadow:0 2px 10px rgba(0,0,0,.06);
}

.header-main{
  height:88px;
  display:flex;
  align-items:center;
  justify-content:space-between;
}

.brand{
  display:flex;
  align-items:center;
  gap:13px;
}

.brand-mark{
  width:62px;
  height:52px;
  background:#1266a0;
  color:#fff;
  display:flex;
  align-items:center;
  justify-content:center;
  font-weight:800;
  font-size:23px;
  letter-spacing:1px;
}

.brand-text{
  display:flex;
  flex-direction:column;
}

.brand-text strong{
  font-size:20px;
  color:#1b3349;
}

.brand-text span{
  margin-top:5px;
  font-size:12px;
  color:#87919b;
  letter-spacing:1px;
}

.nav{
  height:100%;
  display:flex;
  align-items:center;
  gap:37px;
}

.nav a{
  height:100%;
  display:flex;
  align-items:center;
  position:relative;
  font-size:15px;
  color:#283b4d;
}

.nav a:after{
  content:"";
  position:absolute;
  left:50%;
  right:50%;
  bottom:0;
  height:3px;
  background:#1471ad;
  transition:.25s;
}

.nav a:hover:after,
.nav a.active:after{
  left:0;
  right:0;
}

.nav a.active{
  color:#1471ad;
}

.menu-button{
  display:none;
}

.banner{
  height:590px;
  position:relative;
  overflow:hidden;
  background:#18364d;
}

.banner-slide{
  position:absolute;
  inset:0;
  opacity:0;
  visibility:hidden;
  background-size:cover;
  background-position:center;
  transition:opacity .8s ease;
}

.banner-slide.active{
  opacity:1;
  visibility:visible;
}

.banner-slide.fallback{
  background:
    linear-gradient(110deg,#102f4a,#1b709f);
}

.banner-content{
  height:100%;
  display:flex;
  flex-direction:column;
  justify-content:center;
  align-items:flex-start;
  color:#fff;
}

.banner-content h1{
  max-width:780px;
  margin:0;
  font-size:50px;
  line-height:1.25;
  letter-spacing:2px;
}

.banner-content p{
  margin:20px 0 0;
  font-size:20px;
  letter-spacing:2px;
}

.banner-button{
  margin-top:35px;
  display:inline-flex;
  padding:14px 31px;
  border:1px solid rgba(255,255,255,.75);
  color:#fff;
  transition:.2s;
}

.banner-button:hover{
  background:#fff;
  color:#174b70;
}

.banner-dots{
  position:absolute;
  bottom:25px;
  left:50%;
  transform:translateX(-50%);
  display:flex;
  gap:10px;
  z-index:5;
}

.banner-dots button{
  width:28px;
  height:4px;
  padding:0;
  border:0;
  background:rgba(255,255,255,.45);
  cursor:pointer;
}

.banner-dots button.active{
  background:#fff;
}

.section{
  padding:82px 0;
}

.section-heading{
  text-align:center;
  margin-bottom:43px;
}

.section-heading span,
.section-label{
  color:#1874ad;
  font-size:13px;
  font-weight:700;
  letter-spacing:3px;
}

.section-heading h2{
  margin:10px 0 10px;
  font-size:34px;
  color:#18354c;
}

.section-heading p{
  color:#89939d;
  margin:0;
}

.category-nav{
  display:flex;
  justify-content:center;
  flex-wrap:wrap;
  gap:12px;
  margin-bottom:34px;
}

.category-nav a{
  padding:10px 24px;
  background:#f2f5f7;
  transition:.2s;
}

.category-nav a:hover{
  background:#166da6;
  color:#fff;
}

.product-grid{
  display:grid;
  grid-template-columns:repeat(4,1fr);
  gap:22px;
}

.product-card{
  background:#fff;
  border:1px solid #e5eaee;
  transition:.25s;
}

.product-card:hover{
  transform:translateY(-5px);
  box-shadow:0 15px 35px rgba(21,55,78,.12);
}

.product-image{
  height:250px;
  background:#f2f5f7;
  overflow:hidden;
}

.product-image img{
  width:100%;
  height:100%;
  object-fit:cover;
}

.product-placeholder{
  height:100%;
  display:flex;
  flex-direction:column;
  align-items:center;
  justify-content:center;
  background:
    linear-gradient(145deg,#f5f8fa,#dce7ed);
  color:#235878;
}

.product-placeholder span{
  font-size:35px;
  font-weight:800;
  opacity:.18;
}

.product-placeholder strong{
  margin-top:10px;
  font-size:22px;
}

.product-placeholder small{
  margin-top:15px;
  color:#8797a2;
}

.product-info{
  padding:22px;
}

.product-info>span{
  color:#1680bd;
  font-size:12px;
}

.product-info h3{
  margin:8px 0 10px;
  font-size:18px;
  color:#1d3447;
}

.product-info p{
  margin:0;
  color:#89939c;
  font-size:14px;
  min-height:42px;
  line-height:1.7;
}

.more{
  margin-top:16px;
  font-size:13px;
  color:#176da4;
}

.center-button{
  text-align:center;
  margin-top:38px;
}

.outline-button{
  display:inline-block;
  border:1px solid #176da4;
  color:#176da4;
  padding:12px 31px;
}

.outline-button:hover{
  color:#fff;
  background:#176da4;
}

.about-section{
  background:#f2f5f7;
}

.about-grid{
  display:grid;
  grid-template-columns:1.1fr 1fr;
  align-items:center;
  gap:65px;
}

.about-picture{
  min-height:410px;
  overflow:hidden;
}

.about-main-image{
  display:block;
  width:100%;
  height:410px;
  object-fit:cover;
}

.factory-placeholder{
  min-height:410px;
  background:
    linear-gradient(135deg,#173b54,#2478a4);
  display:flex;
  flex-direction:column;
  justify-content:center;
  align-items:center;
  color:#fff;
}

.factory-placeholder span{
  font-size:75px;
  font-weight:900;
  opacity:.15;
}

.factory-placeholder strong{
  font-size:24px;
  letter-spacing:4px;
}

.factory-placeholder small{
  margin-top:14px;
  opacity:.65;
}

.about-content h2{
  margin:12px 0 18px;
  font-size:35px;
  color:#18354c;
}

.about-content h3{
  font-size:20px;
}

.about-content p{
  color:#6f7d88;
  line-height:2;
}

.blue-button{
  display:inline-block;
  margin-top:17px;
  background:#176da4;
  color:#fff;
  padding:13px 30px;
}

.advantages{
  background:#173a53;
  color:#fff;
}

.section-heading.light h2{
  color:#fff;
}

.section-heading.light span{
  color:#6fc0eb;
}

.section-heading.light p{
  color:#b7c8d3;
}

.advantage-grid{
  display:grid;
  grid-template-columns:repeat(4,1fr);
}

.advantage-item{
  min-height:210px;
  padding:30px;
  border-right:1px solid rgba(255,255,255,.16);
}

.advantage-item:last-child{
  border:0;
}

.advantage-item strong{
  font-size:40px;
  color:#4b94bd;
}

.advantage-item h3{
  font-size:20px;
}

.advantage-item p{
  color:#b7c6d0;
  line-height:1.8;
}

.news-section{
  background:#fff;
}

.news-grid{
  display:grid;
  grid-template-columns:repeat(3,1fr);
  gap:22px;
}

.news-card{
  padding:27px;
  border:1px solid #e6eaed;
  transition:.2s;
}

.news-card:hover{
  border-color:#176da4;
}

.news-date{
  color:#87939e;
  font-size:13px;
}

.news-card h3{
  color:#20394d;
  line-height:1.6;
}

.news-card p{
  color:#7c8994;
  line-height:1.8;
  font-size:14px;
}

.news-card span{
  color:#176da4;
  font-size:13px;
}

.empty-news{
  text-align:center;
  background:#f5f7f9;
  color:#8a96a0;
  padding:50px;
}

.contact-strip{
  background:#126ba4;
  color:#fff;
  padding:34px 0;
}

.contact-grid{
  display:grid;
  grid-template-columns:1fr 2fr auto;
  gap:35px;
  align-items:center;
}

.contact-grid div{
  display:flex;
  flex-direction:column;
  gap:8px;
}

.contact-grid span{
  opacity:.7;
  font-size:13px;
}

.contact-grid strong{
  font-size:17px;
}

.contact-grid a{
  padding:12px 26px;
  border:1px solid rgba(255,255,255,.6);
}

.footer{
  background:#132b3e;
  color:#aebbc5;
  padding-top:55px;
}

.footer-grid{
  display:grid;
  grid-template-columns:1.5fr 1fr 1fr 1.5fr;
  gap:50px;
}

.footer-logo{
  display:inline-flex;
  background:#fff;
  color:#176da4;
  padding:10px 14px;
  font-size:23px;
  font-weight:bold;
}

.footer h3,
.footer h4{
  color:#fff;
}

.footer a{
  display:block;
  margin:12px 0;
}

.footer p{
  line-height:1.8;
}

.copyright{
  margin-top:45px;
  border-top:1px solid rgba(255,255,255,.1);
  padding:22px;
  text-align:center;
  font-size:13px;
}

@media(max-width:980px){

  .nav{
    display:none;
    position:absolute;
    top:88px;
    left:0;
    right:0;
    height:auto;
    background:#fff;
    flex-direction:column;
    gap:0;
    align-items:stretch;
    padding:10px 4%;
  }

  .nav.open{
    display:flex;
  }

  .nav a{
    padding:14px 5px;
  }

  .menu-button{
    display:block;
    border:0;
    background:none;
    font-size:27px;
  }

  .product-grid{
    grid-template-columns:repeat(2,1fr);
  }

  .about-grid{
    grid-template-columns:1fr;
  }

  .advantage-grid{
    grid-template-columns:repeat(2,1fr);
  }

  .news-grid{
    grid-template-columns:1fr;
  }

  .footer-grid{
    grid-template-columns:repeat(2,1fr);
  }

}

@media(max-width:600px){

  .topbar{
    display:none;
  }

  .header-main{
    height:72px;
  }

  .brand-mark{
    width:52px;
    height:44px;
  }

  .brand-text strong{
    font-size:16px;
  }

  .brand-text span{
    display:none;
  }

  .nav{
    top:72px;
  }

  .banner{
    height:450px;
  }

  .banner-content h1{
    font-size:32px;
  }

  .banner-content p{
    font-size:16px;
  }

  .section{
    padding:58px 0;
  }

  .product-grid{
    grid-template-columns:1fr;
  }

  .advantage-grid{
    grid-template-columns:1fr;
  }

  .advantage-item{
    border-right:0;
    border-bottom:1px solid rgba(255,255,255,.16);
  }

  .contact-grid{
    grid-template-columns:1fr;
  }

  .footer-grid{
    grid-template-columns:1fr;
  }

}

/* ========================================
   首页 - 应用领域
======================================== */

.applications-section {
  background: #f5f7fa;
}

.application-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
  margin-top: 40px;
}

.application-item {
  position: relative;
  min-height: 150px;
  padding: 30px;
  overflow: hidden;
  background: #ffffff;
  border: 1px solid #e8edf3;
  transition: transform .3s ease, box-shadow .3s ease, border-color .3s ease;
}

.application-item:hover {
  transform: translateY(-5px);
  border-color: #1f5fae;
  box-shadow: 0 15px 35px rgba(20, 48, 82, .10);
}

.application-item strong {
  display: block;
  margin-bottom: 24px;
  color: #1f5fae;
  font-size: 14px;
  font-weight: 700;
  letter-spacing: 1px;
}

.application-item h3 {
  margin: 0;
  color: #172433;
  font-size: 22px;
  font-weight: 600;
  line-height: 1.4;
}

.application-item::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: 0;
  width: 0;
  height: 3px;
  background: #1f5fae;
  transition: width .3s ease;
}

.application-item:hover::after {
  width: 100%;
}


/* ========================================
   首页 - 工程案例
======================================== */

.cases-section {
  background: #f5f7fa;
}

.case-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
  margin-top: 40px;
}

.case-item {
  overflow: hidden;
  background: #ffffff;
  border: 1px solid #e7ebf0;
  transition: transform .3s ease, box-shadow .3s ease;
}

.case-item:hover {
  transform: translateY(-5px);
  box-shadow: 0 16px 38px rgba(20, 48, 82, .12);
}

.case-image {
  position: relative;
  width: 100%;
  aspect-ratio: 16 / 10;
  overflow: hidden;
  background: #e9eef4;
}

.case-image img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform .45s ease;
}

.case-item:hover .case-image img {
  transform: scale(1.04);
}

.case-placeholder {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 100%;
  height: 100%;
  color: #1f5fae;
  font-size: 30px;
  font-weight: 800;
  letter-spacing: 3px;
}

.case-info {
  padding: 22px 24px 26px;
}

.case-info h3 {
  margin: 0 0 10px;
  color: #172433;
  font-size: 20px;
  line-height: 1.45;
}

.case-info p {
  margin: 0;
  color: #6b7785;
  font-size: 14px;
  line-height: 1.8;
}


/* ========================================
   首页新增模块 - 响应式
======================================== */

@media (max-width: 991px) {
  .application-grid,
  .case-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 640px) {
  .application-grid,
  .case-grid {
    grid-template-columns: 1fr;
    gap: 15px;
    margin-top: 28px;
  }

  .application-item {
    min-height: 120px;
    padding: 22px;
  }

  .application-item strong {
    margin-bottom: 16px;
  }

  .application-item h3 {
    font-size: 19px;
  }

  .case-info {
    padding: 18px;
  }
}


/* 首页应用领域图片卡片 */

.application-grid-image{
  align-items:stretch;
}

.application-card{
  background:#fff;
  overflow:hidden;
  border:1px solid #e6edf2;
  box-shadow:0 8px 24px rgba(20,48,68,.06);
  transition:transform .25s ease, box-shadow .25s ease;
}

.application-card:hover{
  transform:translateY(-5px);
  box-shadow:0 14px 34px rgba(20,48,68,.12);
}

.application-card-image{
  height:220px;
  overflow:hidden;
  background:#eaf0f4;
}

.application-card-image img{
  display:block;
  width:100%;
  height:100%;
  object-fit:cover;
  transition:transform .35s ease;
}

.application-card:hover .application-card-image img{
  transform:scale(1.04);
}

.application-card-placeholder{
  height:100%;
  display:flex;
  align-items:center;
  justify-content:center;
  background:linear-gradient(135deg,#173b54,#2478a4);
  color:#fff;
}

.application-card-placeholder span{
  font-size:48px;
  font-weight:800;
  opacity:.22;
}

.application-card-body{
  position:relative;
  padding:24px 24px 26px;
}

.application-card-no{
  margin-bottom:8px;
  color:#1680bd;
  font-size:12px;
  font-weight:700;
  letter-spacing:2px;
}

.application-card-body h3{
  margin:0 0 10px;
  font-size:20px;
  color:#1d3447;
}

.application-card-body p{
  margin:0;
  color:#71808b;
  font-size:14px;
  line-height:1.8;
}

@media(max-width:991px){
  .application-card-image{
    height:200px;
  }
}

@media(max-width:640px){
  .application-card-image{
    height:210px;
  }

  .application-card-body{
    padding:20px;
  }
}