/* 天寰软创官网 - 基础样式（借鉴华为官网视觉语言） */
:root{
  --red:#cf0a2c;
  --red-dark:#a30822;
  --red-soft:#fef2f4;
  --ink:#1d1d1d;
  --gray:#666;
  --gray-light:#999;
  --line:#e6e6e6;
  --bg:#f5f5f7;
  --white:#fff;
  --nav-h:64px;
  --maxw:1240px;
  --radius:6px;
  --shadow:0 2px 12px rgba(0,0,0,.06);
  --shadow-hover:0 8px 28px rgba(0,0,0,.12);
}
*{margin:0;padding:0;box-sizing:border-box}
html{scroll-behavior:smooth}
body{
  font-family:"PingFang SC","Hiragino Sans GB","Microsoft YaHei","Helvetica Neue",Arial,sans-serif;
  color:var(--ink);background:var(--white);line-height:1.7;
  -webkit-font-smoothing:antialiased;
}
a{color:inherit;text-decoration:none}
ul{list-style:none}
img{max-width:100%;display:block}
.wrap{max-width:var(--maxw);margin:0 auto;padding:0 24px}
.btn{
  display:inline-flex;align-items:center;gap:6px;height:44px;padding:0 28px;
  border-radius:2px;font-size:15px;font-weight:500;cursor:pointer;transition:.25s;border:1px solid transparent;
}
.btn-red{background:var(--red);color:#fff}
.btn-red:hover{background:var(--red-dark)}
.btn-ghost{border-color:#fff;color:#fff}
.btn-ghost:hover{background:rgba(255,255,255,.15)}
.btn-outline{border-color:var(--red);color:var(--red)}
.btn-outline:hover{background:var(--red);color:#fff}
.arrow{width:16px;height:16px;transition:transform .25s}
.btn:hover .arrow{transform:translateX(4px)}

/* ============ 顶部工具条 ============ */
.topbar{background:#191919;color:#cfcfcf;font-size:12px;height:36px;position:relative;z-index:60}
.topbar .wrap{display:flex;align-items:center;justify-content:flex-end;height:36px;gap:22px}
.topbar a:hover{color:#fff}

/* ============ 导航 ============ */
.header{
  position:sticky;top:0;z-index:50;background:rgba(255,255,255,.96);
  backdrop-filter:saturate(180%) blur(12px);border-bottom:1px solid var(--line);
}
.nav{display:flex;align-items:center;height:var(--nav-h);gap:40px}
.logo{display:flex;align-items:center;gap:10px;flex-shrink:0}
.logo-img{height:42px;width:auto;display:block}
.foot-logo{height:48px;width:auto;display:block;margin-bottom:14px}
.logo-mark{
  width:36px;height:36px;border-radius:8px;background:linear-gradient(135deg,var(--red),#ff5a3c);
  display:flex;align-items:center;justify-content:center;color:#fff;font-weight:700;font-size:15px;letter-spacing:-.5px;
}
.logo-text{font-size:17px;font-weight:600;letter-spacing:.5px;line-height:1.2}
.logo-text small{display:block;font-size:10px;color:var(--gray-light);letter-spacing:2px;font-weight:400}
.menu{display:flex;align-items:center;gap:2px;margin-left:auto}
.menu>li{position:relative}
.menu>li>a{
  display:flex;align-items:center;gap:4px;height:var(--nav-h);padding:0 16px;
  font-size:15px;color:#333;position:relative;transition:color .2s;
}
.menu>li>a::after{
  content:"";position:absolute;left:16px;right:16px;bottom:0;height:2px;background:var(--red);
  transform:scaleX(0);transform-origin:left;transition:transform .25s;
}
.menu>li:hover>a,.menu>li.active>a{color:var(--red)}
.menu>li:hover>a::after,.menu>li.active>a::after{transform:scaleX(1)}
.caret{width:10px;height:10px;opacity:.6}
.nav-actions{display:flex;align-items:center;gap:14px;padding-left:18px;border-left:1px solid var(--line)}
.icon-btn{
  width:36px;height:36px;border-radius:50%;display:flex;align-items:center;justify-content:center;
  border:1px solid var(--line);background:#fff;cursor:pointer;transition:.2s;
}
.icon-btn:hover{border-color:var(--red);color:var(--red)}
.icon-btn svg{width:17px;height:17px}

/* 下拉面板 */
.dropdown{
  position:absolute;top:var(--nav-h);left:50%;transform:translateX(-50%) translateY(10px);
  background:#fff;border-top:2px solid var(--red);box-shadow:var(--shadow-hover);
  min-width:520px;padding:22px 26px;display:grid;grid-template-columns:repeat(2,1fr);gap:6px 20px;
  opacity:0;visibility:hidden;transition:.25s;pointer-events:none;
}
.menu>li:hover .dropdown{opacity:1;visibility:visible;transform:translateX(-50%) translateY(0);pointer-events:auto}
.dropdown a{
  display:block;padding:9px 12px;border-radius:4px;font-size:14px;color:#444;transition:.2s;
}
.dropdown a:hover{background:var(--red-soft);color:var(--red)}
.dropdown a b{display:block;font-weight:600;font-size:14px;color:var(--ink)}
.dropdown a span{font-size:12px;color:var(--gray-light)}

/* 移动端汉堡 */
.burger{display:none;width:40px;height:40px;border:none;background:none;cursor:pointer}
.burger span{display:block;width:22px;height:2px;background:#333;margin:5px auto;transition:.25s}

/* ============ Banner ============ */
.hero{position:relative;height:560px;overflow:hidden;background:#0a0a0a}
.slide{
  position:absolute;inset:0;display:flex;align-items:center;opacity:0;transition:opacity .8s ease;
  padding:0 24px;
}
.slide.active{opacity:1}
.slide-bg{position:absolute;inset:0;overflow:hidden}
.slide-bg::after{content:"";position:absolute;inset:0;background:linear-gradient(90deg,rgba(0,0,0,.72) 0%,rgba(0,0,0,.35) 55%,rgba(0,0,0,.1) 100%)}
.sl1{background:linear-gradient(135deg,#0b1f3a 0%,#123a63 45%,#cf0a2c 130%)}
.sl2{background:linear-gradient(135deg,#101820 0%,#1b4a3a 50%,#2fa36b 130%)}
.sl3{background:linear-gradient(135deg,#231a3d 0%,#452a63 50%,#cf0a2c 140%)}
.grid-bg{
  position:absolute;inset:0;opacity:.35;
  background-image:linear-gradient(rgba(255,255,255,.08) 1px,transparent 1px),linear-gradient(90deg,rgba(255,255,255,.08) 1px,transparent 1px);
  background-size:60px 60px;
  mask-image:radial-gradient(circle at 30% 50%,#000 0%,transparent 75%);
  -webkit-mask-image:radial-gradient(circle at 30% 50%,#000 0%,transparent 75%);
}
.slide-inner{position:relative;max-width:var(--maxw);margin:0 auto;width:100%;color:#fff}
.slide-tag{
  display:inline-block;font-size:12px;letter-spacing:3px;color:#ffb3bf;
  border:1px solid rgba(255,255,255,.35);padding:4px 12px;border-radius:20px;margin-bottom:20px;
}
/* 数字孪生专区 */
.twin-feature{display:grid;grid-template-columns:1.15fr 1fr;gap:48px;align-items:center}
.tw-visual{
  height:340px;border-radius:8px;overflow:hidden;border:1px solid var(--line);
  box-shadow:0 12px 34px rgba(0,0,0,.18);
}
.tw-visual img{width:100%;height:100%;object-fit:cover;display:block}
@media(max-width:900px){
  .twin-feature{grid-template-columns:1fr;gap:28px}
  .tw-visual{height:240px}
}
/* 数字孪生主视觉 */
.twin-bg{
  position:absolute;inset:0;
  background:url(../img/datacenter-twin.svg) center 40%/cover no-repeat;
  animation:kb 26s ease-in-out infinite alternate;
}
@keyframes kb{from{transform:scale(1)}to{transform:scale(1.05)}}
.adv-visual img{width:100%;height:100%;object-fit:cover;display:block;animation:none}
.adv-visual{border-radius:8px;box-shadow:0 12px 34px rgba(0,0,0,.22)}
.slide h1 em{font-style:normal;color:#ff8f9f}
.slide p{font-size:17px;color:rgba(255,255,255,.82);max-width:520px;margin-bottom:32px}
.slide-btns{display:flex;gap:14px;flex-wrap:wrap}
.hero-dots{position:absolute;bottom:28px;left:0;right:0;display:flex;justify-content:center;gap:10px;z-index:5}
.hero-dots button{
  width:32px;height:3px;border:none;background:rgba(255,255,255,.4);cursor:pointer;padding:0;transition:.3s;
}
.hero-dots button.on{background:var(--red);width:52px}

/* ============ 数据条 ============ */
.stats{background:#fff;border-bottom:1px solid var(--line)}
.stats-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:0}
.stat{padding:36px 20px;text-align:center;border-right:1px solid var(--line)}
.stat:last-child{border-right:none}
.stat-num{font-size:38px;font-weight:600;color:var(--red);line-height:1.1;font-variant-numeric:tabular-nums}
.stat-num span{font-size:20px;margin-left:2px}
.stat-label{font-size:13px;color:var(--gray);margin-top:6px;letter-spacing:1px}

/* ============ 通用区块 ============ */
section{padding:72px 0}
.sec-head{text-align:center;margin-bottom:44px}
.sec-head h2{font-size:32px;font-weight:600;letter-spacing:1px;margin-bottom:12px}
.sec-head p{color:var(--gray);font-size:15px;max-width:680px;margin:0 auto}
.sec-head::after{content:"";width:44px;height:3px;background:var(--red);display:block;margin:16px auto 0}
.bg-gray{background:var(--bg)}

/* 卡片：解决方案 */
.cards{display:grid;grid-template-columns:repeat(3,1fr);gap:24px}
.card{
  background:#fff;border:1px solid var(--line);border-radius:var(--radius);overflow:hidden;
  transition:.3s;display:flex;flex-direction:column;
}
.card:hover{transform:translateY(-6px);box-shadow:var(--shadow-hover);border-color:transparent}
.card-img{height:172px;position:relative;display:flex;align-items:center;justify-content:center}
.card-img svg{width:64px;height:64px;opacity:.9}
.card-img::before{
  content:"";position:absolute;inset:0;
  background-image:linear-gradient(rgba(255,255,255,.07) 1px,transparent 1px),linear-gradient(90deg,rgba(255,255,255,.07) 1px,transparent 1px);
  background-size:32px 32px;
}
.ci-blue{background:linear-gradient(135deg,#0d2a4d,#1e5f8f)}
.ci-green{background:linear-gradient(135deg,#0f3326,#1f6b4a)}
.ci-red{background:linear-gradient(135deg,#3a0f1c,#a5203a)}
.ci-purple{background:linear-gradient(135deg,#1e1540,#4a3080)}
.ci-teal{background:linear-gradient(135deg,#0c2f38,#1a6c78)}
.ci-orange{background:linear-gradient(135deg,#3a1f0a,#a35a17)}
.card-body{padding:24px;flex:1;display:flex;flex-direction:column}
.card-body h3{font-size:19px;font-weight:600;margin-bottom:10px}
.card-body p{font-size:14px;color:var(--gray);flex:1}
.card-more{
  margin-top:16px;font-size:14px;color:var(--red);display:inline-flex;align-items:center;gap:5px;font-weight:500;
}

/* 产品条 */
.products{display:grid;grid-template-columns:repeat(4,1fr);gap:1px;background:var(--line);border:1px solid var(--line)}
.product{background:#fff;padding:30px 24px;transition:.3s;cursor:pointer}
.product:hover{background:var(--red-soft)}
.p-icon{
  width:48px;height:48px;border-radius:10px;background:var(--red-soft);display:flex;
  align-items:center;justify-content:center;margin-bottom:16px;
}
.p-icon svg{width:26px;height:26px;color:var(--red)}
.product h4{font-size:16px;font-weight:600;margin-bottom:8px}
.product p{font-size:13px;color:var(--gray);line-height:1.65}

/* 优势 2 栏 */
.adv{display:grid;grid-template-columns:1fr 1fr;gap:56px;align-items:center}
.adv-visual{
  height:340px;border-radius:8px;position:relative;overflow:hidden;
  background:linear-gradient(135deg,#0b1f3a,#1e5f8f 60%,#cf0a2c 130%);
}
.adv-visual::before{
  content:"";position:absolute;inset:0;
  background-image:linear-gradient(rgba(255,255,255,.09) 1px,transparent 1px),linear-gradient(90deg,rgba(255,255,255,.09) 1px,transparent 1px);
  background-size:44px 44px;
}
.adv-list li{display:flex;gap:14px;padding:16px 0;border-bottom:1px dashed var(--line)}
.adv-list li:last-child{border-bottom:none}
.adv-tag{
  flex-shrink:0;width:30px;height:30px;border-radius:50%;background:var(--red);color:#fff;
  display:flex;align-items:center;justify-content:center;font-size:13px;font-weight:600;
}
.adv-list h4{font-size:16px;font-weight:600;margin-bottom:4px}
.adv-list p{font-size:14px;color:var(--gray)}

/* 案例 */
.cases{display:grid;grid-template-columns:repeat(3,1fr);gap:24px}
.case{border:1px solid var(--line);border-radius:var(--radius);overflow:hidden;background:#fff;transition:.3s}
.case:hover{box-shadow:var(--shadow-hover);transform:translateY(-4px)}
.case-top{height:130px;display:flex;align-items:center;padding:24px;color:#fff;position:relative;overflow:hidden}
.case-top h3{font-size:20px;font-weight:600;position:relative;z-index:2}
.case-body{padding:20px 24px 24px}
.case-body p{font-size:14px;color:var(--gray)}
.case-meta{margin-top:14px;display:flex;gap:18px;font-size:13px;color:var(--red)}
.case-meta span strong{font-size:18px;font-weight:600;margin-right:4px}

/* 新闻 */
.news-grid{display:grid;grid-template-columns:1.3fr 1fr;gap:32px}
.news-main{border:1px solid var(--line);border-radius:var(--radius);overflow:hidden;background:#fff}
.news-main-img{height:260px;background:linear-gradient(135deg,#0b1f3a,#1e5f8f 70%,#cf0a2c 140%);position:relative}
.news-main-img::before{
  content:"";position:absolute;inset:0;
  background-image:linear-gradient(rgba(255,255,255,.08) 1px,transparent 1px),linear-gradient(90deg,rgba(255,255,255,.08) 1px,transparent 1px);
  background-size:40px 40px;
}
.news-main-body{padding:26px}
.news-date{font-size:13px;color:var(--gray-light);margin-bottom:8px}
.news-main-body h3{font-size:22px;font-weight:600;line-height:1.45;margin-bottom:12px}
.news-main-body p{font-size:14px;color:var(--gray)}
.news-list li{border-bottom:1px solid var(--line)}
.news-list a{display:flex;gap:18px;padding:18px 4px;transition:.25s}
.news-list a:hover{padding-left:10px}
.nl-date{
  flex-shrink:0;width:58px;text-align:center;background:var(--bg);border-radius:4px;padding:6px 0;height:fit-content;
}
.nl-date b{display:block;font-size:20px;font-weight:600;color:var(--red);line-height:1.1}
.nl-date span{font-size:11px;color:var(--gray-light)}
.news-list h4{font-size:15px;font-weight:500;line-height:1.6}
.news-list a:hover h4{color:var(--red)}

/* CTA */
.cta{
  background:linear-gradient(120deg,#0b1f3a 0%,#123a63 55%,#cf0a2c 130%);
  color:#fff;text-align:center;position:relative;overflow:hidden;
}
.cta::before{
  content:"";position:absolute;inset:0;
  background-image:linear-gradient(rgba(255,255,255,.07) 1px,transparent 1px),linear-gradient(90deg,rgba(255,255,255,.07) 1px,transparent 1px);
  background-size:50px 50px;
}
.cta-inner{position:relative;z-index:2}
.cta h2{font-size:32px;font-weight:600;margin-bottom:14px}
.cta p{color:rgba(255,255,255,.8);margin-bottom:30px}

/* ============ 页脚 ============ */
.footer{background:#1a1a1a;color:#bbb;font-size:13px;padding-top:52px}
.foot-grid{display:grid;grid-template-columns:1.6fr repeat(4,1fr);gap:32px;padding-bottom:40px}
.foot-brand p{color:#888;margin-top:14px;line-height:1.8;font-size:13px;max-width:280px}
.foot-brand .logo-text{color:#fff;font-size:16px}
.foot-col h5{color:#fff;font-size:14px;font-weight:600;margin-bottom:16px;letter-spacing:.5px}
.foot-col li{margin-bottom:10px}
.foot-col a:hover{color:var(--red)}
.foot-contact li{color:#888;display:flex;gap:8px;margin-bottom:12px}
.foot-contact svg{width:15px;height:15px;flex-shrink:0;margin-top:4px;color:var(--red)}
.foot-social{display:flex;gap:12px;margin-top:18px}
.foot-social a{
  width:34px;height:34px;border:1px solid #444;border-radius:50%;display:flex;align-items:center;justify-content:center;transition:.25s;
}
.foot-social a:hover{background:var(--red);border-color:var(--red);color:#fff}
.foot-social svg{width:16px;height:16px}
.foot-bottom{border-top:1px solid #2e2e2e;padding:20px 0}
.foot-bottom .wrap{display:flex;justify-content:space-between;flex-wrap:wrap;gap:12px;color:#777}
.foot-bottom a:hover{color:var(--red)}

/* 页内 Banner */
.page-hero{
  height:280px;display:flex;align-items:center;color:#fff;position:relative;overflow:hidden;
  background:linear-gradient(120deg,#0b1f3a 0%,#123a63 60%,#cf0a2c 140%);
}
.page-hero::before{
  content:"";position:absolute;inset:0;
  background-image:linear-gradient(rgba(255,255,255,.08) 1px,transparent 1px),linear-gradient(90deg,rgba(255,255,255,.08) 1px,transparent 1px);
  background-size:50px 50px;
}
.page-hero .wrap{position:relative;z-index:2}
.page-hero h1{font-size:40px;font-weight:600;margin-bottom:10px}
.page-hero p{color:rgba(255,255,255,.8)}
.crumb{font-size:13px;color:rgba(255,255,255,.65);margin-bottom:14px}
.crumb a:hover{color:#fff}

/* 内容区 */
.prose{max-width:900px}
.prose h3{font-size:22px;margin:36px 0 14px;font-weight:600}
.prose p{color:#555;margin-bottom:16px}
.timeline{border-left:2px solid var(--line);padding-left:28px;margin-left:10px}
.timeline li{position:relative;padding-bottom:30px}
.timeline li::before{
  content:"";position:absolute;left:-35px;top:6px;width:12px;height:12px;border-radius:50%;
  background:#fff;border:3px solid var(--red);
}
.timeline .tl-year{font-size:14px;color:var(--red);font-weight:600;margin-bottom:4px}
.timeline h4{font-size:17px;margin-bottom:6px}
.timeline p{font-size:14px;color:var(--gray)}

/* 联系表单 */
.contact-grid{display:grid;grid-template-columns:1fr 1fr;gap:56px}
.form-row{margin-bottom:18px}
.form-row label{display:block;font-size:14px;margin-bottom:8px;color:#444}
.form-row input,.form-row textarea,.form-row select{
  width:100%;padding:12px 14px;border:1px solid var(--line);border-radius:4px;font-size:14px;
  font-family:inherit;transition:.2s;background:#fff;
}
.form-row input:focus,.form-row textarea:focus,.form-row select:focus{outline:none;border-color:var(--red)}
.form-row textarea{height:120px;resize:vertical}
.info-block{display:flex;gap:14px;padding:18px 0;border-bottom:1px solid var(--line)}
.info-block svg{width:20px;height:20px;color:var(--red);flex-shrink:0;margin-top:3px}
.info-block h5{font-size:15px;margin-bottom:2px}
.info-block p{font-size:14px;color:var(--gray)}
.map-mock{
  margin-top:24px;height:220px;border-radius:8px;border:1px solid var(--line);background:var(--bg);
  display:flex;align-items:center;justify-content:center;color:var(--gray-light);font-size:13px;position:relative;overflow:hidden;
}
.map-mock::before{
  content:"";position:absolute;inset:0;
  background-image:linear-gradient(var(--line) 1px,transparent 1px),linear-gradient(90deg,var(--line) 1px,transparent 1px);
  background-size:40px 40px;opacity:.7;
}
.map-mock span{position:relative;z-index:2}

/* 表格/过滤 */
.filters{display:flex;gap:10px;flex-wrap:wrap;margin-bottom:30px}
.filter{padding:7px 20px;border:1px solid var(--line);border-radius:20px;font-size:14px;cursor:pointer;transition:.2s;background:#fff}
.filter:hover{border-color:var(--red);color:var(--red)}
.filter.on{background:var(--red);border-color:var(--red);color:#fff}

/* 响应式 */
@media(max-width:1024px){
  .cards,.cases{grid-template-columns:repeat(2,1fr)}
  .products{grid-template-columns:repeat(2,1fr)}
  .foot-grid{grid-template-columns:1fr 1fr 1fr}
  .foot-brand{grid-column:1/-1}
  .news-grid{grid-template-columns:1fr}
  .adv,.contact-grid{grid-template-columns:1fr;gap:32px}
  .slide h1{font-size:40px}
  .dropdown{min-width:420px}
}
@media(max-width:768px){
  .menu{
    position:fixed;top:calc(var(--nav-h));left:0;right:0;background:#fff;border-bottom:1px solid var(--line);
    flex-direction:column;align-items:stretch;max-height:0;overflow:hidden;transition:.3s;gap:0;box-shadow:var(--shadow);
  }
  .menu.open{max-height:80vh;overflow-y:auto;padding:10px 0}
  .menu>li>a{height:48px;padding:0 24px;border-bottom:1px solid #f2f2f2}
  .menu>li>a::after{display:none}
  .burger{display:block;margin-left:auto}
  .nav-actions{margin-left:12px}
  .dropdown{position:static;transform:none;opacity:1;visibility:visible;pointer-events:auto;box-shadow:none;border-top:none;min-width:0;display:none;padding:0 0 8px}
  .menu>li:hover .dropdown{transform:none;display:grid;grid-template-columns:1fr}
  .slide h1{font-size:30px}
  .slide p{font-size:15px}
  .hero{height:460px}
  .cards,.cases,.products,.stats-grid{grid-template-columns:1fr}
  .stat{border-right:none;border-bottom:1px solid var(--line)}
  .sec-head h2,.cta h2{font-size:26px}
  .page-hero h1{font-size:30px}
  .foot-grid{grid-template-columns:1fr 1fr}
  section{padding:52px 0}
}

/* 卡片效果图 */
.card-img img{width:100%;height:100%;object-fit:cover;display:block}
.card-img{overflow:hidden}

/* 定位示意图 */
.map-loc{position:relative;margin-top:36px;border-radius:12px;overflow:hidden;border:1px solid rgba(63,216,200,.18);box-shadow:0 18px 50px rgba(2,12,24,.45)}
.map-loc img{display:block;width:100%;height:auto}
.map-actions{position:absolute;right:18px;bottom:18px;display:flex;gap:10px;flex-wrap:wrap}
.btn-sm{padding:10px 18px;font-size:14px}
@media (max-width:720px){.map-actions{left:18px;justify-content:center}}