/* ===== Veltracloud 静态主页样式 ===== */
:root{
  --primary:#1e3a8a;
  --primary-light:#3b5bdb;
  --accent:#7c3aed;
  --accent-light:#a855f7;
  --cyan:#06b6d4;
  --ink:#0f172a;
  --ink-2:#1e293b;
  --sub:#64748b;
  --line:#e2e8f0;
  --bg:#f8fafc;
  --white:#ffffff;
  --radius:14px;
  --shadow-sm:0 1px 3px rgba(15,23,42,.06),0 1px 2px rgba(15,23,42,.04);
  --shadow-md:0 4px 16px rgba(15,23,42,.08);
  --shadow-lg:0 12px 40px rgba(30,58,138,.18);
  --grad:linear-gradient(135deg,#1e3a8a 0%,#4338ca 50%,#7c3aed 100%);
  --grad-soft:linear-gradient(135deg,#eff6ff 0%,#f5f3ff 100%);
}

*{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth}
body{
  font-family:-apple-system,BlinkMacSystemFont,"PingFang SC","Hiragino Sans GB",
    "Microsoft YaHei","Noto Sans CJK SC",sans-serif;
  color:var(--ink);background:var(--bg);line-height:1.7;font-size:15px;
  -webkit-font-smoothing:antialiased;
}
a{color:inherit;text-decoration:none}
ul{list-style:none}
img{max-width:100%;display:block}
.container{max-width:1200px;margin:0 auto;padding:0 24px}

/* ===== 顶部导航 ===== */
.navbar{
  position:fixed;top:0;left:0;right:0;z-index:1000;
  background:rgba(255,255,255,.85);backdrop-filter:blur(12px);
  border-bottom:1px solid var(--line);transition:all .3s;
}
.navbar.scrolled{box-shadow:var(--shadow-sm)}
.nav-inner{display:flex;align-items:center;justify-content:space-between;height:68px}
.logo{display:flex;align-items:center;gap:10px;font-weight:700;font-size:20px}
.logo-mark{
  width:36px;height:36px;border-radius:10px;background:var(--grad);
  display:flex;align-items:center;justify-content:center;color:#fff;font-size:18px;
  box-shadow:0 4px 12px rgba(124,58,237,.3);
}
.logo-text{background:var(--grad);-webkit-background-clip:text;background-clip:text;
  -webkit-text-fill-color:transparent;}
.nav-menu{display:flex;align-items:center;gap:4px}
.nav-menu a{
  padding:8px 16px;border-radius:8px;color:var(--ink-2);font-size:14.5px;
  font-weight:500;transition:all .2s;position:relative;
}
.nav-menu a:hover{color:var(--primary-light);background:rgba(59,91,219,.06)}
.nav-menu a.active{color:var(--primary-light)}
.nav-cta{
  display:flex;align-items:center;gap:10px;
}
.btn{
  display:inline-flex;align-items:center;gap:6px;padding:9px 20px;
  border-radius:8px;font-size:14px;font-weight:600;cursor:pointer;
  transition:all .25s;border:none;white-space:nowrap;
}
.btn-primary{background:var(--grad);color:#fff;box-shadow:0 4px 14px rgba(59,91,219,.3)}
.btn-primary:hover{transform:translateY(-1px);box-shadow:0 6px 20px rgba(59,91,219,.4)}
.btn-ghost{background:rgba(255,255,255,.6);color:var(--ink);border:1px solid var(--line)}
.btn-ghost:hover{border-color:var(--primary-light);color:var(--primary-light)}
.lang-switch{font-size:13px;color:var(--sub);cursor:pointer;padding:4px 8px;border-radius:6px}
.lang-switch:hover{color:var(--primary-light)}
.mobile-toggle{display:none;flex-direction:column;gap:5px;cursor:pointer;padding:6px}
.mobile-toggle span{width:24px;height:2px;background:var(--ink);border-radius:2px;transition:.3s}

/* ===== Hero ===== */
.hero{
  position:relative;padding:140px 0 80px;overflow:hidden;
  background:radial-gradient(ellipse at top left,#1e3a8a 0%,#0f172a 100%);
  color:#fff;
}
.hero::before{
  content:"";position:absolute;inset:0;
  background-image:
    radial-gradient(circle at 20% 30%,rgba(124,58,237,.25),transparent 40%),
    radial-gradient(circle at 80% 20%,rgba(6,182,212,.18),transparent 35%),
    radial-gradient(circle at 50% 80%,rgba(59,91,219,.2),transparent 45%);
}
.hero-grid{position:relative;z-index:2;display:grid;grid-template-columns:1.1fr .9fr;gap:60px;align-items:center}
.hero-tag{
  display:inline-flex;align-items:center;gap:8px;padding:6px 16px;
  border-radius:20px;background:rgba(255,255,255,.1);border:1px solid rgba(255,255,255,.2);
  font-size:13px;color:#c7d2fe;margin-bottom:24px;backdrop-filter:blur(8px);
}
.hero-tag .dot{width:7px;height:7px;border-radius:50%;background:#34d399;box-shadow:0 0 8px #34d399}
.hero h1{font-size:48px;line-height:1.2;margin-bottom:20px;font-weight:800;letter-spacing:-.5px}
.hero h1 .grad{background:linear-gradient(90deg,#a5b4fc,#c4b5fd,#67e8f9);
  -webkit-background-clip:text;background-clip:text;-webkit-text-fill-color:transparent;}
.hero p.lead{font-size:17px;color:#cbd5e1;max-width:520px;margin-bottom:32px;line-height:1.8}
.hero-actions{display:flex;gap:14px;flex-wrap:wrap}
.hero-actions .btn-primary{background:linear-gradient(90deg,#4f46e5,#7c3aed)}
.hero-actions .btn-ghost{background:rgba(255,255,255,.08);color:#fff;border-color:rgba(255,255,255,.25)}
.hero-actions .btn-ghost:hover{background:rgba(255,255,255,.15);border-color:#a5b4fc}
.hero-stats{display:flex;gap:40px;margin-top:48px;padding-top:32px;border-top:1px solid rgba(255,255,255,.12)}
.hero-stats .stat b{display:block;font-size:30px;font-weight:800;color:#fff}
.hero-stats .stat span{font-size:13px;color:#94a3b8}

/* Hero 右侧可视化卡片 */
.hero-visual{position:relative;padding:60px 30px}
.hero-card{
  position:relative;z-index:1;
  background:rgba(255,255,255,.06);border:1px solid rgba(255,255,255,.12);
  border-radius:18px;padding:28px;backdrop-filter:blur(14px);
  box-shadow:0 20px 60px rgba(0,0,0,.3);
}
.hero-card .card-head{display:flex;align-items:center;justify-content:space-between;margin-bottom:20px}
.hero-card .card-head h4{font-size:15px;font-weight:600;color:#e2e8f0}
.hero-card .badge{font-size:11px;padding:3px 10px;border-radius:12px;background:rgba(52,211,153,.15);color:#34d399;font-weight:600}
.api-row{display:flex;align-items:center;justify-content:space-between;padding:12px 0;border-bottom:1px solid rgba(255,255,255,.08)}
.api-row:last-child{border-bottom:0}
.api-row .name{display:flex;align-items:center;gap:10px;font-size:14px;color:#e2e8f0}
.api-row .name i{width:8px;height:8px;border-radius:50%;background:var(--c)}
.api-row .val{font-size:13px;color:#94a3b8;font-family:ui-monospace,monospace}
.api-row .val.up{color:#34d399}
.float-chip{
  position:absolute;z-index:3;background:rgba(255,255,255,.1);border:1px solid rgba(255,255,255,.15);
  border-radius:12px;padding:12px 16px;backdrop-filter:blur(10px);font-size:13px;color:#e2e8f0;
  animation:float 4s ease-in-out infinite;
}
.float-chip.chip1{top:0;right:0;animation-delay:0s}
.float-chip.chip2{bottom:0;left:0;animation-delay:1s}
@keyframes float{0%,100%{transform:translateY(0)}50%{transform:translateY(-10px)}}

/* ===== 通用区块 ===== */
section{padding:90px 0}
.section-head{text-align:center;margin-bottom:56px}
.section-head .kicker{font-size:13px;letter-spacing:2px;color:var(--primary-light);font-weight:700;text-transform:uppercase;margin-bottom:12px}
.section-head h2{font-size:36px;font-weight:800;letter-spacing:-.5px;margin-bottom:14px}
.section-head p{color:var(--sub);font-size:16px;max-width:640px;margin:0 auto}

/* ===== 核心数据 ===== */
.stats-band{
  background:var(--white);border-top:1px solid var(--line);border-bottom:1px solid var(--line);
  padding:60px 0;
}
.stats-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:24px;text-align:center}
.stats-grid .item{padding:20px}
.stats-grid .item b{display:block;font-size:40px;font-weight:800;background:var(--grad);
  -webkit-background-clip:text;background-clip:text;-webkit-text-fill-color:transparent;line-height:1.2}
.stats-grid .item span{font-size:14px;color:var(--sub);margin-top:8px;display:block}

/* ===== 产品中心 ===== */
.products{background:var(--white)}
.product-tabs{display:flex;justify-content:center;gap:8px;margin-bottom:48px;flex-wrap:wrap}
.product-tabs button{
  padding:10px 24px;border-radius:24px;border:1px solid var(--line);background:#fff;
  font-size:14px;font-weight:600;color:var(--sub);cursor:pointer;transition:all .25s;
}
.product-tabs button.active,.product-tabs button:hover{
  background:var(--grad);color:#fff;border-color:transparent;box-shadow:0 4px 14px rgba(59,91,219,.3);
}
.product-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:24px}
.product-card{
  background:var(--bg);border:1px solid var(--line);border-radius:var(--radius);
  padding:30px 26px;transition:all .3s;position:relative;overflow:hidden;
}
.product-card::before{content:"";position:absolute;top:0;left:0;right:0;height:3px;
  background:var(--grad);transform:scaleX(0);transform-origin:left;transition:transform .35s}
.product-card:hover{transform:translateY(-6px);box-shadow:var(--shadow-lg);border-color:transparent}
.product-card:hover::before{transform:scaleX(1)}
.product-icon{
  width:52px;height:52px;border-radius:14px;display:flex;align-items:center;justify-content:center;
  font-size:24px;margin-bottom:18px;background:var(--grad-soft);color:var(--primary-light);
}
.product-card h3{font-size:18px;font-weight:700;margin-bottom:10px}
.product-card p{color:var(--sub);font-size:14px;line-height:1.7;margin-bottom:16px}
.product-card .tags{display:flex;gap:6px;flex-wrap:wrap}
.product-card .tag{font-size:12px;padding:3px 10px;border-radius:6px;background:rgba(59,91,219,.08);color:var(--primary-light);font-weight:500}
.product-card .arrow{position:absolute;bottom:26px;right:26px;color:var(--sub);transition:.25s}
.product-card:hover .arrow{color:var(--primary-light);transform:translateX(4px)}

/* ===== 为什么选择我们 ===== */
.why{background:var(--bg)}
.why-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:24px}
.why-card{
  background:#fff;border:1px solid var(--line);border-radius:var(--radius);
  padding:32px 24px;text-align:center;transition:all .3s;
}
.why-card:hover{transform:translateY(-4px);box-shadow:var(--shadow-md)}
.why-icon{
  width:64px;height:64px;border-radius:18px;margin:0 auto 18px;
  display:flex;align-items:center;justify-content:center;font-size:28px;
  background:var(--grad);color:#fff;box-shadow:0 8px 20px rgba(59,91,219,.25);
}
.why-card h4{font-size:17px;font-weight:700;margin-bottom:8px}
.why-card p{color:var(--sub);font-size:13.5px;line-height:1.7}

/* ===== 解决方案 / 目标客群 ===== */
.solutions{background:var(--white)}
.sol-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:24px}
.sol-card{
  display:flex;gap:24px;padding:30px;background:var(--bg);border-radius:var(--radius);
  border:1px solid var(--line);transition:all .3s;
}
.sol-card:hover{border-color:var(--primary-light);box-shadow:var(--shadow-md)}
.sol-icon{flex:0 0 56px;height:56px;border-radius:14px;background:var(--grad);
  display:flex;align-items:center;justify-content:center;font-size:26px;color:#fff}
.sol-body h4{font-size:17px;font-weight:700;margin-bottom:6px}
.sol-body .meta{font-size:12.5px;color:var(--primary-light);font-weight:600;margin-bottom:8px}
.sol-body p{color:var(--sub);font-size:14px}

/* ===== 合作伙伴 ===== */
.partners{background:var(--bg)}
.partner-cats{margin-bottom:40px}
.partner-cat{margin-bottom:36px}
.partner-cat h4{font-size:15px;color:var(--sub);margin-bottom:16px;font-weight:600;
  padding-left:12px;border-left:3px solid var(--primary-light)}
.partner-row{display:grid;grid-template-columns:repeat(4,1fr);gap:16px}
.partner-logo{
  background:#fff;border:1px solid var(--line);border-radius:10px;height:72px;
  display:flex;align-items:center;justify-content:center;font-weight:700;font-size:15px;
  color:var(--ink-2);transition:all .25s;
}
.partner-logo:hover{border-color:var(--primary-light);color:var(--primary-light);transform:translateY(-2px);box-shadow:var(--shadow-sm)}

/* ===== 客户行业 ===== */
.industries{background:var(--white)}
.ind-chips{display:flex;flex-wrap:wrap;justify-content:center;gap:12px;margin-bottom:48px}
.ind-chip{padding:8px 20px;border-radius:20px;background:var(--grad-soft);color:var(--primary);
  font-size:14px;font-weight:600;border:1px solid #c7d2fe}
.ind-chips b{color:var(--accent)}

/* ===== 新闻资讯 ===== */
.news{background:var(--bg)}
.news-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:24px}
.news-card{
  background:#fff;border:1px solid var(--line);border-radius:var(--radius);overflow:hidden;
  transition:all .3s;cursor:pointer;
}
.news-card:hover{transform:translateY(-4px);box-shadow:var(--shadow-md)}
.news-thumb{height:180px;background:var(--grad);position:relative;overflow:hidden}
.news-thumb::after{content:"";position:absolute;inset:0;background:
  radial-gradient(circle at 30% 50%,rgba(255,255,255,.15),transparent 50%)}
.news-thumb .date{position:absolute;bottom:14px;left:16px;color:#fff;font-size:13px;font-weight:600}
.news-body{padding:22px}
.news-body .cat{font-size:12px;color:var(--primary-light);font-weight:700;margin-bottom:8px}
.news-body h4{font-size:16px;font-weight:700;margin-bottom:10px;line-height:1.5}
.news-body p{color:var(--sub);font-size:13px;line-height:1.7;display:-webkit-box;
  -webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden}

/* ===== 招贤纳士 ===== */
.careers{background:var(--white)}
.career-tabs{display:flex;justify-content:center;gap:8px;margin-bottom:40px;flex-wrap:wrap}
.career-tabs button{
  padding:10px 22px;border-radius:8px;border:1px solid var(--line);background:#fff;
  font-size:14px;font-weight:600;color:var(--sub);cursor:pointer;transition:.25s;
}
.career-tabs button.active{background:var(--grad);color:#fff;border-color:transparent}
.job-list{max-width:820px;margin:0 auto}
.job-item{border:1px solid var(--line);border-radius:12px;margin-bottom:14px;overflow:hidden;background:#fff}
.job-head{
  display:flex;align-items:center;justify-content:space-between;padding:20px 24px;
  cursor:pointer;transition:.2s;
}
.job-head:hover{background:var(--bg)}
.job-head .title{display:flex;align-items:center;gap:14px}
.job-head .title h4{font-size:16px;font-weight:700}
.job-head .title .loc{font-size:12.5px;color:var(--sub)}
.job-head .chev{color:var(--sub);transition:.3s;font-size:18px}
.job-item.open .job-head .chev{transform:rotate(180deg)}
.job-body{max-height:0;overflow:hidden;transition:max-height .4s ease;padding:0 24px}
.job-item.open .job-body{max-height:800px;padding:0 24px 24px}
.job-body h5{font-size:14px;color:var(--primary-light);font-weight:700;margin:16px 0 8px}
.job-body ul{padding-left:18px}
.job-body li{font-size:13.5px;color:var(--ink-2);margin-bottom:5px;list-style:disc}

/* ===== CTA 联系区 ===== */
.cta-band{
  background:var(--grad);color:#fff;padding:70px 0;text-align:center;position:relative;overflow:hidden;
}
.cta-band::before{content:"";position:absolute;inset:0;background:
  radial-gradient(circle at 20% 50%,rgba(255,255,255,.1),transparent 40%),
  radial-gradient(circle at 80% 50%,rgba(6,182,212,.15),transparent 40%)}
.cta-band .container{position:relative;z-index:2}
.cta-band h2{font-size:32px;font-weight:800;margin-bottom:14px}
.cta-band p{color:#e0e7ff;font-size:16px;margin-bottom:30px}
.cta-band .btn-primary{background:#fff;color:var(--primary);box-shadow:0 8px 24px rgba(0,0,0,.2)}
.cta-band .btn-ghost{background:rgba(255,255,255,.12);color:#fff;border-color:rgba(255,255,255,.3)}

/* ===== 页脚 ===== */
.footer{background:#0f172a;color:#cbd5e1;padding:64px 0 0}
.footer-grid{display:grid;grid-template-columns:1.4fr 1fr 1fr 1fr;gap:40px;padding-bottom:48px}
.footer-brand .logo-text{-webkit-text-fill-color:#fff;color:#fff;margin-bottom:16px;display:block}
.footer-brand p{font-size:13.5px;color:#94a3b8;line-height:1.8;margin-bottom:18px}
.footer-social{display:flex;gap:10px}
.footer-social a{width:36px;height:36px;border-radius:8px;background:rgba(255,255,255,.06);
  display:flex;align-items:center;justify-content:center;font-size:16px;transition:.2s}
.footer-social a:hover{background:var(--primary-light)}
.footer-col h5{color:#fff;font-size:14px;font-weight:700;margin-bottom:18px}
.footer-col a{display:block;font-size:13.5px;color:#94a3b8;padding:5px 0;transition:.2s}
.footer-col a:hover{color:#fff;transform:translateX(3px)}
.footer-bottom{border-top:1px solid rgba(255,255,255,.08);padding:22px 0;display:flex;
  justify-content:space-between;flex-wrap:wrap;gap:12px;font-size:12.5px;color:#64748b}

/* ===== 回到顶部 ===== */
.back-top{
  position:fixed;bottom:30px;right:30px;width:46px;height:46px;border-radius:50%;
  background:var(--grad);color:#fff;border:none;cursor:pointer;display:flex;
  align-items:center;justify-content:center;font-size:18px;box-shadow:var(--shadow-lg);
  opacity:0;visibility:hidden;transition:all .3s;z-index:999;
}
.back-top.show{opacity:1;visibility:visible}
.back-top:hover{transform:translateY(-3px)}

/* ===== 响应式 ===== */
@media(max-width:960px){
  .hero-grid{grid-template-columns:1fr;gap:40px}
  .hero h1{font-size:34px}
  .hero-visual{max-width:480px;margin:0 auto}
  .product-grid{grid-template-columns:repeat(2,1fr)}
  .why-grid{grid-template-columns:repeat(2,1fr)}
  .sol-grid{grid-template-columns:1fr}
  .partner-row{grid-template-columns:repeat(3,1fr)}
  .news-grid{grid-template-columns:1fr}
  .footer-grid{grid-template-columns:1fr 1fr;gap:32px}
  .stats-grid{grid-template-columns:repeat(2,1fr)}
}
@media(max-width:720px){
  section{padding:64px 0}
  .section-head h2{font-size:28px}
  .hero{padding:110px 0 60px}
  .hero h1{font-size:28px}
  .hero-stats{gap:24px}
  .hero-stats .stat b{font-size:24px}
  .product-grid{grid-template-columns:1fr}
  .partner-row{grid-template-columns:repeat(2,1fr)}
  .footer-grid{grid-template-columns:1fr}
  .nav-menu{display:none;position:absolute;top:68px;left:0;right:0;flex-direction:column;
    background:#fff;padding:16px;gap:4px;border-bottom:1px solid var(--line);box-shadow:var(--shadow-md)}
  .nav-menu.open{display:flex}
  .nav-menu a{padding:12px 16px}
  .mobile-toggle{display:flex}
  .nav-cta .btn-ghost{display:none}
  .stats-grid .item b{font-size:30px}
}