*{margin:0;padding:0;box-sizing:border-box}

body{font-family:"Roboto", "Helvetica Neue", "Arial", sans-serif;color:#333;line-height:1.5;background:#f5f5f5;font-size:15px;}

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

.obctu-container{max-width:1166px;margin:0 auto;padding:0 20px}

.obctu-header{background:hsl(263, 63%, 27%);color:#fff;padding:19px 0;position:sticky;top:0;z-index:100}

.obctu-header-inner{display:flex;justify-content:space-between;align-items:center}

.obctu-logo{font-size:22px;font-weight:700}

.obctu-nav{display:flex;gap:25px}

.obctu-nav-link{color:rgba(255,255,255,.85);font-size:15px;padding:5px 0;border-bottom:2px solid transparent;transition:.3s}

.obctu-nav-link:hover,.obctu-nav-link.obctu-active{color:#fff;border-bottom-color:hsl(66, 82%, 56%)}

.obctu-banner,.obctu-page-banner{min-height:320px;display:flex;align-items:center;justify-content:center;text-align:center;color:#fff}

.obctu-banner-mask{background:rgba(0,0,0,.45);padding:50px 30px;border-radius:6px}

.obctu-banner h1,.obctu-page-banner h1{font-size:32px;margin-bottom:12px}

.obctu-banner p{font-size:16px;opacity:.9}

.obctu-section{padding:52px 0}

.obctu-bg-light{background:#f0f2f5}

.obctu-section-title{text-align:center;font-size:26px;margin-bottom:40px;color:hsl(263, 58%, 15%);position:relative}

.obctu-section-title::after{content:"";display:block;width:50px;height:3px;background:double 2px hsl(66, 82%, 56%);margin:12px auto 0}

.obctu-content{max-width:800px;margin:0 auto;font-size:15px;line-height:1.5;white-space:pre-wrap}

.obctu-product-grid,.obctu-case-grid,.obctu-service-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:25px}

.obctu-product-card,.obctu-case-card,.obctu-service-card{background:#fff;border-radius:6px;overflow:hidden;box-shadow:0 1px 6px rgba(0,0,0,.06);transition:.3s;border:1px solid rgba(0,0,0,.06)}

.obctu-product-card:hover,.obctu-case-card:hover,.obctu-service-card:hover{transform:translateY(-4px);box-shadow:0 4px 16px rgba(0,0,0,.10)}

.obctu-product-card img,.obctu-case-card img,.obctu-service-card img{width:100%;height:200px;object-fit:cover}

.obctu-product-card h3,.obctu-case-card h3,.obctu-service-card h3{padding:15px 18px 8px;font-size:17px}

.obctu-news-list{max-width:800px;margin:0 auto}

.obctu-news-item{background:#fff;padding:20px 25px;margin-bottom:15px;border-radius:6px;box-shadow:0 2px 8px rgba(0,0,0,.06)}

.obctu-news-item h3{font-size:17px;margin-bottom:8px}

.obctu-news-date{color:#999;font-size:13px}

.obctu-product-detail{display:flex;gap:30px;align-items:flex-start;flex-wrap:wrap}

.obctu-detail-img{width:400px;height:300px;object-fit:cover;overflow:hidden;border-radius:6px;box-shadow:0 4px 16px rgba(0,0,0,.1)}
.obctu-detail-img img{width:100%;height:100%;object-fit:cover;display:block;border-radius:inherit}

.obctu-product-detail .obctu-content{flex:1;min-width:280px;margin:0}

.obctu-footer{background:hsl(263, 58%, 15%);color:rgba(255,255,255,.7);text-align:center;padding:30px 0;font-size:14px}



/* 汉堡菜单按钮 */

.obctu-hamburger{display:none;flex-direction:column;justify-content:space-around;width:28px;height:24px;background:transparent;border:none;cursor:pointer;padding:0;z-index:110}

.obctu-hamburger span{display:block;width:100%;height:3px;background:#fff;border-radius:2px;transition:.3s}

.obctu-hamburger-active span:nth-child(1){transform:rotate(45deg) translate(6px,6px)}

.obctu-hamburger-active span:nth-child(2){opacity:0}

.obctu-hamburger-active span:nth-child(3){transform:rotate(-45deg) translate(6px,-6px)}



.obctu-product-card,.obctu-case-card,.obctu-service-card{transition:transform .55s cubic-bezier(.2,.8,.2,1),box-shadow .55s ease}.obctu-product-card:hover,.obctu-case-card:hover,.obctu-service-card:hover{transform:translateY(-6px) scale(1.03) rotate(-.6deg)}
.obctu-header{background:linear-gradient(120deg,hsl(263, 63%, 27%),hsl(66, 82%, 56%),hsl(263, 63%, 27%));background-size:220% 220%;animation:obctu-hg 9s ease infinite}@keyframes obctu-hg{0%{background-position:0% 50%}50%{background-position:100% 50%}100%{background-position:0% 50%}}
@media(max-width:768px){

    .obctu-hamburger{display:flex}

    .obctu-nav{display:none;flex-direction:column;width:100%;gap:0;background:hsl(263, 63%, 27%);padding:0;position:absolute;top:100%;left:0}

    .obctu-nav.obctu-nav-open{display:flex}

    .obctu-nav-link{display:block;padding:12px 20px;border-bottom:1px solid rgba(255,255,255,.1)}

    .obctu-header-inner{flex-direction:row;justify-content:space-between;align-items:center;gap:6px}

    .obctu-banner h1,.obctu-page-banner h1{font-size:24px}

    .obctu-product-grid,.obctu-case-grid,.obctu-service-grid{grid-template-columns:1fr}

    .obctu-product-detail{flex-direction:column}

    .obctu-detail-img{width:100%}
}