/* ========== CROSSTEK 克霍斯特官网预览版 ========== */
:root{
  --navy:#0B1F3A;
  --navy-2:#10294E;
  --blue:#1F4E9C;
  --blue-e:#2E7CD6;
  --ink:#0f172a;
  --slate:#475569;
  --line:#E2E8F0;
  --bg:#FFFFFF;
  --bg-soft:#F4F7FB;
  --white:#FFFFFF;
  --radius:16px;
  --font:"Helvetica Neue",Arial,"PingFang SC","Hiragino Sans GB","Microsoft YaHei",sans-serif;
}
*{margin:0;padding:0;box-sizing:border-box}
html{scroll-behavior:smooth}
body{font-family:var(--font);color:var(--ink);background:var(--bg);line-height:1.75;font-size:16px;-webkit-font-smoothing:antialiased}
a{color:inherit;text-decoration:none}
ul{list-style:none}
img{max-width:100%;display:block}
.wrap{max-width:1200px;margin:0 auto;padding:0 32px}

/* ---------- 头部 ---------- */
.site-header{position:fixed;top:0;left:0;right:0;z-index:100;transition:background .35s,box-shadow .35s;padding:18px 0}
.site-header .wrap{display:flex;align-items:center;justify-content:space-between}
.brand{display:flex;align-items:center;gap:12px}
.brand .logo-mark{width:40px;height:40px;flex:none}
.brand .name{font-weight:700;font-size:17px;letter-spacing:.5px;color:var(--white);line-height:1.3}
.brand .name small{display:block;font-weight:400;font-size:11px;opacity:.75;letter-spacing:1px}
.main-nav{display:flex;gap:6px}
.main-nav a{color:rgba(255,255,255,.82);font-size:15px;padding:8px 14px;border-radius:8px;transition:color .25s,background .25s}
.main-nav a:hover{color:#fff;background:rgba(255,255,255,.12)}
.main-nav a.active{color:#fff;font-weight:600}
.site-header.scrolled{background:rgba(255,255,255,.96);box-shadow:0 2px 16px rgba(11,31,58,.10);backdrop-filter:blur(8px)}
.site-header.scrolled .brand .name{color:var(--navy)}
.site-header.scrolled .main-nav a{color:var(--slate)}
.site-header.scrolled .main-nav a:hover{color:var(--blue);background:var(--bg-soft)}
.site-header.scrolled .main-nav a.active{color:var(--blue)}
.site-header.solid{background:#fff;box-shadow:0 2px 16px rgba(11,31,58,.10)}
.site-header.solid .brand .name{color:var(--navy)}
.site-header.solid .main-nav a{color:var(--slate)}
.site-header.solid .main-nav a:hover{color:var(--blue);background:var(--bg-soft)}
.site-header.solid .main-nav a.active{color:var(--blue);font-weight:600}
.nav-toggle{display:none;background:none;border:0;cursor:pointer;padding:8px}
.nav-toggle span{display:block;width:24px;height:2px;background:#fff;margin:5px 0;transition:.3s}
.site-header.scrolled .nav-toggle span,.site-header.solid .nav-toggle span{background:var(--navy)}

/* ---------- Hero ---------- */
.hero{position:relative;min-height:92vh;display:flex;align-items:center;background:linear-gradient(160deg,var(--navy) 0%,var(--navy-2) 45%,var(--blue) 100%);overflow:hidden;color:#fff}
.hero .hero-inner{position:relative;z-index:2;padding:140px 0 200px}
.hero .eyebrow{font-size:14px;letter-spacing:4px;text-transform:uppercase;color:var(--blue-e);margin-bottom:20px;font-weight:600}
.hero h1{font-size:56px;line-height:1.25;font-weight:700;letter-spacing:1px;margin-bottom:24px}
.hero .sub{font-size:19px;color:rgba(255,255,255,.78);max-width:640px;margin-bottom:44px}
.hero-wave{position:absolute;left:0;right:0;bottom:-2px;z-index:1;pointer-events:none}
.hero-wave svg{display:block;width:100%;height:220px}
.hero-dots{position:absolute;top:0;right:0;bottom:0;width:45%;z-index:0;opacity:.5;
  background-image:radial-gradient(rgba(255,255,255,.14) 1.5px,transparent 1.5px);background-size:34px 34px}
.btn{display:inline-flex;align-items:center;gap:10px;padding:14px 32px;border-radius:10px;font-size:16px;font-weight:600;transition:.3s;border:1.5px solid transparent;cursor:pointer}
.btn .arr{transition:transform .3s}
.btn:hover .arr{transform:translateX(6px)}
.btn-primary{background:var(--blue-e);color:#fff}
.btn-primary:hover{background:#fff;color:var(--blue)}
.btn-ghost{border-color:rgba(255,255,255,.5);color:#fff}
.btn-ghost:hover{background:rgba(255,255,255,.12);border-color:#fff}
.btn-blue{background:var(--blue);color:#fff}
.btn-blue:hover{background:var(--navy)}

/* 数据条 */
.stats{background:var(--navy);color:#fff;padding:56px 0;border-top:1px solid rgba(255,255,255,.08)}
.stats .grid{display:grid;grid-template-columns:repeat(4,1fr);gap:32px}
.stat .num{font-size:44px;font-weight:700;color:var(--blue-e);line-height:1.1}
.stat .num small{font-size:20px;font-weight:600;margin-left:2px}
.stat .lbl{margin-top:8px;font-size:14px;color:rgba(255,255,255,.65);letter-spacing:1px}

/* ---------- 通用节区 ---------- */
.section{padding:110px 0}
.section.soft{background:var(--bg-soft)}
.sec-head{margin-bottom:64px}
.sec-no{font-size:14px;font-weight:700;letter-spacing:3px;color:var(--blue-e);display:flex;align-items:center;gap:14px;margin-bottom:16px}
.sec-no::after{content:"";height:1px;width:64px;background:var(--blue-e);opacity:.5}
.sec-head h2{font-size:38px;font-weight:700;letter-spacing:1px;color:var(--navy)}
.sec-head .lead{margin-top:14px;color:var(--slate);max-width:760px;font-size:17px}

/* 产品卡片 */
.prod-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:28px}
.prod-card{background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:36px 30px;position:relative;transition:transform .35s,box-shadow .35s,border-color .35s;overflow:hidden}
.prod-card::before{content:"";position:absolute;top:0;left:0;right:0;height:4px;background:linear-gradient(90deg,var(--blue),var(--blue-e));transform:scaleX(0);transform-origin:left;transition:transform .4s}
.prod-card:hover{transform:translateY(-6px);box-shadow:0 18px 44px rgba(11,31,58,.12);border-color:transparent}
.prod-card:hover::before{transform:scaleX(1)}
.prod-card .idx{font-size:13px;font-weight:700;letter-spacing:2px;color:var(--blue-e);margin-bottom:14px}
.prod-card h3{font-size:19px;color:var(--navy);margin-bottom:12px;line-height:1.5}
.prod-card p{font-size:14.5px;color:var(--slate)}
.prod-card .go{margin-top:20px;display:inline-flex;align-items:center;gap:6px;font-size:14px;font-weight:600;color:var(--blue)}
.prod-card .go .arr{transition:transform .3s}
.prod-card:hover .go .arr{transform:translateX(5px)}

/* 技术条目 */
.tech-list{display:grid;grid-template-columns:repeat(3,1fr);gap:48px}
.tech-item .big{font-size:72px;font-weight:700;color:transparent;-webkit-text-stroke:1.5px rgba(46,124,214,.55);line-height:1;margin-bottom:18px}
.tech-item h3{font-size:20px;color:var(--navy);margin-bottom:12px}
.tech-item p{font-size:15px;color:var(--slate)}

/* 应用领域 */
.app-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:28px}
.app-card{border-radius:var(--radius);padding:40px 32px;color:#fff;min-height:300px;display:flex;flex-direction:column;justify-content:flex-end;position:relative;overflow:hidden;background:linear-gradient(170deg,var(--navy-2),var(--blue))}
.app-card:nth-child(2){background:linear-gradient(170deg,#123C6E,#2E7CD6)}
.app-card:nth-child(3){background:linear-gradient(170deg,#0B1F3A,#1F4E9C)}
.app-card::after{content:"";position:absolute;inset:0;background-image:radial-gradient(rgba(255,255,255,.10) 1.5px,transparent 1.5px);background-size:26px 26px;opacity:.5}
.app-card h3{font-size:22px;margin-bottom:14px;position:relative;z-index:1}
.app-card ul{position:relative;z-index:1}
.app-card li{font-size:14.5px;color:rgba(255,255,255,.85);padding:5px 0 5px 18px;position:relative}
.app-card li::before{content:"";position:absolute;left:0;top:14px;width:7px;height:7px;border-radius:50%;background:var(--blue-e)}

/* CTA */
.cta{background:linear-gradient(120deg,var(--navy),var(--blue));color:#fff;padding:96px 0;text-align:center;position:relative;overflow:hidden}
.cta h2{font-size:36px;margin-bottom:16px}
.cta p{color:rgba(255,255,255,.8);font-size:17px;margin-bottom:36px}
.cta .btn-row{display:flex;gap:16px;justify-content:center;flex-wrap:wrap}
.cta .circle{position:absolute;border-radius:50%;border:1px solid rgba(255,255,255,.08)}
.cta .c1{width:420px;height:420px;top:-210px;left:-140px}
.cta .c2{width:520px;height:520px;bottom:-300px;right:-180px}

/* ---------- 内页页头 ---------- */
.page-hero{background:linear-gradient(150deg,var(--navy) 0%,var(--navy-2) 55%,var(--blue) 120%);color:#fff;padding:170px 0 90px;position:relative;overflow:hidden}
.page-hero .eyebrow{font-size:13px;letter-spacing:4px;color:var(--blue-e);font-weight:600;margin-bottom:14px}
.page-hero h1{font-size:44px;font-weight:700;letter-spacing:1px}
.page-hero .sub{margin-top:14px;color:rgba(255,255,255,.75);font-size:17px;max-width:720px}
.page-hero .hero-dots{opacity:.35}

/* 内页内容 */
.content{padding:90px 0}
.content h3.block-title{font-size:26px;color:var(--navy);margin:56px 0 22px;padding-left:18px;border-left:5px solid var(--blue-e);line-height:1.4}
.content h3.block-title:first-child{margin-top:0}
.content p{margin-bottom:16px;color:#334155}
.content .bullets li{padding:8px 0 8px 24px;position:relative;color:#334155}
.content .bullets li::before{content:"";position:absolute;left:0;top:19px;width:8px;height:8px;border-radius:50%;background:var(--blue-e)}

/* 时间轴 */
.timeline{border-left:2px solid var(--line);margin-left:8px}
.timeline .ti{position:relative;padding:6px 0 26px 36px}
.timeline .ti::before{content:"";position:absolute;left:-9px;top:14px;width:16px;height:16px;border-radius:50%;background:#fff;border:4px solid var(--blue-e)}
.timeline .yr{font-size:22px;font-weight:700;color:var(--blue)}
.timeline .tx{color:#334155;margin-top:4px}

/* 团队 */
.team-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:26px}
.team-card{background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:30px 24px;text-align:center;transition:transform .3s,box-shadow .3s}
.team-card:hover{transform:translateY(-5px);box-shadow:0 14px 36px rgba(11,31,58,.10)}
.team-card .avatar{width:88px;height:88px;border-radius:50%;margin:0 auto 18px;display:flex;align-items:center;justify-content:center;background:linear-gradient(140deg,var(--blue),var(--blue-e));color:#fff;font-size:30px;font-weight:700}
.team-card h4{font-size:18px;color:var(--navy)}
.team-card .role{font-size:13px;color:var(--blue-e);font-weight:600;margin:6px 0 12px}
.team-card p{font-size:13.5px;color:var(--slate);text-align:left}

/* 规格表 */
.spec-table{width:100%;border-collapse:collapse;margin:18px 0 30px;font-size:14.5px;background:#fff;border-radius:12px;overflow:hidden;box-shadow:0 2px 14px rgba(11,31,58,.06)}
.spec-table th{background:var(--navy);color:#fff;text-align:left;padding:13px 16px;font-weight:600;white-space:nowrap}
.spec-table td{padding:12px 16px;border-bottom:1px solid var(--line);color:#334155}
.spec-table tr:nth-child(even) td{background:var(--bg-soft)}
.spec-table tr:hover td{background:#EAF2FB}
.spec-table .hl{color:var(--blue);font-weight:600}

/* 案例卡 */
.case-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:26px}
.case-card{background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:32px;transition:transform .3s,box-shadow .3s;position:relative}
.case-card:hover{transform:translateY(-5px);box-shadow:0 16px 40px rgba(11,31,58,.10)}
.case-card .tag{display:inline-block;font-size:12px;font-weight:600;letter-spacing:1px;color:var(--blue);background:#EAF2FB;padding:4px 12px;border-radius:20px;margin-bottom:14px}
.case-card h3{font-size:18px;color:var(--navy);margin-bottom:10px;line-height:1.5}
.case-card p{font-size:14.5px;color:var(--slate)}

/* 联系 */
.contact-grid{display:grid;grid-template-columns:1.05fr 1fr;gap:56px;align-items:start}
.contact-list .ci{display:flex;gap:18px;padding:22px 0;border-bottom:1px solid var(--line)}
.contact-list .ci .ic{width:46px;height:46px;flex:none;border-radius:12px;background:#EAF2FB;display:flex;align-items:center;justify-content:center}
.contact-list .ci .ic svg{width:22px;height:22px;stroke:var(--blue)}
.contact-list .ci .k{font-size:13px;color:var(--slate);letter-spacing:1px}
.contact-list .ci .v{font-size:17px;font-weight:600;color:var(--navy);margin-top:2px}
.map-box{background:linear-gradient(155deg,var(--bg-soft),#E4EDF8);border:1px solid var(--line);border-radius:var(--radius);padding:40px;text-align:center}
.map-box svg{width:100%;height:auto}
.map-box .tip{font-size:13px;color:var(--slate);margin-top:16px}
.city-tags{display:flex;gap:12px;justify-content:center;margin-top:18px;flex-wrap:wrap}
.city-tags span{background:#fff;border:1px solid var(--line);color:var(--blue);font-weight:600;font-size:14px;padding:8px 20px;border-radius:24px}

/* 页脚 */
.site-footer{background:var(--navy);color:rgba(255,255,255,.7);padding:72px 0 32px;font-size:14px}
.site-footer .cols{display:grid;grid-template-columns:1.4fr 1fr 1fr 1.2fr;gap:44px;padding-bottom:48px;border-bottom:1px solid rgba(255,255,255,.1)}
.site-footer h5{color:#fff;font-size:16px;margin-bottom:18px;letter-spacing:1px}
.site-footer li{padding:5px 0}
.site-footer a:hover{color:#fff}
.site-footer .f-brand{font-size:18px;font-weight:700;color:#fff;margin-bottom:12px}
.site-footer .bottom{padding-top:26px;display:flex;justify-content:space-between;flex-wrap:wrap;gap:10px;font-size:13px;color:rgba(255,255,255,.5)}
.site-footer .bottom a{color:rgba(255,255,255,.65)}
.site-footer .bottom a:hover{color:#fff}

/* 响应式 */
@media(max-width:980px){
  .prod-grid,.tech-list,.app-grid{grid-template-columns:1fr 1fr}
  .team-grid{grid-template-columns:1fr 1fr}
  .stats .grid{grid-template-columns:1fr 1fr;gap:24px}
  .contact-grid{grid-template-columns:1fr}
  .site-footer .cols{grid-template-columns:1fr 1fr}
  .hero h1{font-size:40px}
}
@media(max-width:640px){
  .main-nav{position:fixed;inset:0 0 0 30%;background:var(--navy);flex-direction:column;padding:100px 28px;gap:4px;transform:translateX(100%);transition:transform .35s}
  .main-nav.open{transform:translateX(0)}
  .main-nav a{color:#fff!important;font-size:17px;padding:12px 8px}
  .nav-toggle{display:block;z-index:110}
  .prod-grid,.tech-list,.app-grid,.team-grid,.case-grid{grid-template-columns:1fr}
  .hero h1{font-size:32px}
  .sec-head h2{font-size:28px}
  .page-hero h1{font-size:32px}
  .section{padding:72px 0}
  .wrap{padding:0 20px}
}