/* ============================================================
   偶聚 · 区块链技术服务平台  —  现代版官网
   深空节点网络视觉系统
   ============================================================ */

:root{
  --bg:#0B1426;
  --bg-2:#0F1B33;
  --panel:#101E38;
  --panel-2:#0C1830;
  --line:#1E2C4A;
  --cyan:#33C2FF;
  --blue:#2E6DFF;
  --cyan-2:#38D2FF;
  --gold:#F5B64A;
  --text:#E8F0FF;
  --text-2:#9FB0C9;
  --text-3:#64748B;
  --grad:linear-gradient(135deg,#2E6DFF 0%,#38D2FF 100%);
  --ease:cubic-bezier(.2,.7,.2,1);
  --radius:16px;
  --shadow:0 20px 60px -20px rgba(2,12,32,.7);
}

*{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth}
body{
  font-family:"PingFang SC","Microsoft YaHei","Noto Sans SC",system-ui,sans-serif;
  background:var(--bg);color:var(--text);
  line-height:1.7;font-size:15px;
  -webkit-font-smoothing:antialiased;overflow-x:hidden;
}
a{color:inherit;text-decoration:none}
img{max-width:100%;display:block}
button{font-family:inherit}

/* ---------- 容器 ---------- */
.container{width:100%;max-width:1200px;margin:0 auto;padding:0 24px}
.section{padding:88px 0;position:relative}

/* ---------- 通用网络背景 ---------- */
.bg-network{position:absolute;inset:0;z-index:0;overflow:hidden;pointer-events:none}
.bg-network::before{
  content:"";position:absolute;top:-40%;left:-10%;width:60%;height:90%;
  background:radial-gradient(circle at 20% 30%,rgba(46,109,255,.18),transparent 60%);
}
.bg-network::after{
  content:"";position:absolute;right:-10%;bottom:-40%;width:60%;height:90%;
  background:radial-gradient(circle at 80% 70%,rgba(56,210,255,.14),transparent 60%);
}

/* ---------- 顶部导航 ---------- */
.site-header{
  position:fixed;top:0;left:0;right:0;z-index:100;
  transition:.35s var(--ease);
  border-bottom:1px solid transparent;
  background:linear-gradient(180deg,rgba(11,20,38,.85),rgba(11,20,38,0));
}
.site-header.scrolled{
  background:rgba(11,20,38,.9);
  backdrop-filter:blur(14px);
  border-bottom-color:var(--line);
}
.nav{display:flex;align-items:center;justify-content:space-between;height:72px}
.brand{display:flex;align-items:center;gap:12px;font-weight:800;font-size:22px;letter-spacing:.5px}
.brand .mark{width:36px;height:36px;border-radius:9px;object-fit:contain;flex-shrink:0}
.brand .sub{display:block;font-size:10px;color:var(--text-3);font-weight:600;letter-spacing:2px;margin-top:-2px}
.nav-links{display:flex;align-items:center;gap:34px;list-style:none}
.nav-links a{color:var(--text-2);font-size:15px;font-weight:500;position:relative;transition:.25s}
.nav-links a::after{
  content:"";position:absolute;left:0;bottom:-6px;height:2px;width:0;border-radius:2px;background:var(--grad);transition:.3s var(--ease);
}
.nav-links a:hover,.nav-links a.active{color:#fff}
.nav-links a:hover::after,.nav-links a.active::after{width:100%}
.nav-cta{display:inline-flex}
.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;padding:12px 26px;border-radius:12px;font-weight:600;font-size:15px;transition:.3s var(--ease);cursor:pointer;border:0;line-height:1}
.btn-grad{background:var(--grad);color:#fff;box-shadow:0 12px 28px -8px rgba(46,109,255,.55)}
.btn-grad:hover{transform:translateY(-2px);box-shadow:0 18px 36px -8px rgba(56,210,255,.6)}
.btn-ghost{background:transparent;color:var(--text);border:1px solid var(--line)}
.btn-ghost:hover{border-color:var(--cyan);color:var(--cyan)}
.nav-toggle{display:none;background:none;border:0;cursor:pointer;width:40px;height:40px;place-items:center;color:#fff}
.lang-li{position:relative;display:flex;align-items:center}
.lang-btn{display:inline-flex;align-items:center;gap:7px;padding:0 12px;height:38px;border-radius:10px;border:1px solid transparent;background:none;color:var(--text-2);cursor:pointer;transition:.25s;margin-left:2px;flex-shrink:0}
.lang-btn .lang-current{font-size:12.5px;font-weight:600;letter-spacing:.5px;line-height:1;color:inherit}
.lang-btn:hover{color:var(--cyan);border-color:var(--line);background:rgba(56,210,255,.06)}
.lang-btn[aria-expanded="true"]{color:var(--cyan);border-color:var(--line);background:rgba(56,210,255,.1)}
.lang-menu{position:absolute;top:calc(100% + 10px);right:0;min-width:156px;background:var(--bg-2);border:1px solid var(--line);border-radius:12px;padding:6px;box-shadow:0 16px 40px -12px rgba(0,0,0,.6);list-style:none;margin:0;opacity:0;visibility:hidden;transform:translateY(-6px);transition:.22s var(--ease);z-index:100}
.lang-menu a{display:block;padding:9px 14px;border-radius:8px;font-size:13px;font-weight:600;letter-spacing:.3px;color:var(--text-2);transition:.2s;white-space:nowrap;position:static}
.lang-menu a::after{display:none!important}
.lang-menu a:hover{color:var(--cyan);background:rgba(56,210,255,.08)}
.lang-menu a.active{color:var(--cyan);background:rgba(56,210,255,.12)}
.lang-li.open .lang-menu{opacity:1;visibility:visible;transform:translateY(0)}

/* ---------- Hero ---------- */
.hero{position:relative;min-height:92vh;display:flex;align-items:center;padding:140px 0 96px;overflow:hidden}
.hero-grid{
  position:absolute;inset:0;z-index:0;
  background-image:radial-gradient(rgba(120,170,255,.14) 1px,transparent 1px);
  background-size:34px 34px;
  -webkit-mask-image:radial-gradient(circle at 60% 40%,#000 0%,transparent 75%);
          mask-image:radial-gradient(circle at 60% 40%,#000 0%,transparent 75%);
}
.hero .container{position:relative;z-index:2}
.hero-eyebrow{display:inline-flex;align-items:center;gap:8px;padding:7px 16px;border-radius:100px;border:1px solid var(--line);background:rgba(16,30,56,.6);color:var(--cyan);font-size:13px;font-weight:500;margin-bottom:22px}
.hero-eyebrow .dot{width:7px;height:7px;border-radius:50%;background:var(--cyan);box-shadow:0 0 12px var(--cyan);animation:pulse 2s infinite}
.hero h1{font-size:clamp(34px,5.2vw,60px);line-height:1.16;font-weight:800;letter-spacing:.5px;margin-bottom:20px}
.hero h1 .grad-text{background:var(--grad);-webkit-background-clip:text;background-clip:text;color:transparent}
.hero p.lead{font-size:clamp(16px,1.4vw,19px);color:var(--text-2);max-width:600px;margin-bottom:36px}
.hero-actions{display:flex;gap:16px;flex-wrap:wrap}
.hero-stats{display:flex;gap:48px;margin-top:64px;flex-wrap:wrap}
.stat b{display:block;font-size:clamp(28px,3.4vw,40px);font-weight:800;line-height:1.1;background:var(--grad);-webkit-background-clip:text;background-clip:text;color:transparent}
.stat .gold b{background:none;color:var(--gold);-webkit-background-clip:unset;background-clip:unset}
.stat span{color:var(--text-3);font-size:14px}

/* ---------- 区块标题 ---------- */
.section-head{margin-bottom:48px;max-width:720px}
.section-head .tag{display:inline-flex;align-items:center;gap:8px;color:var(--cyan);font-size:14px;font-weight:600;letter-spacing:1px;margin-bottom:12px}
.section-head .tag::before{content:"";width:22px;height:2px;background:var(--grad);border-radius:2px}
.section-head h2{font-size:clamp(26px,3vw,36px);font-weight:800;line-height:1.25;margin-bottom:14px}
.section-head p{color:var(--text-2);font-size:16px}

/* ---------- 卡片网格 ---------- */
.grid{display:grid;gap:24px;position:relative;z-index:1}
.grid-3{grid-template-columns:repeat(3,1fr)}
.grid-4{grid-template-columns:repeat(4,1fr)}
.card{
  background:linear-gradient(180deg,var(--panel),var(--panel-2));
  border:1px solid var(--line);border-radius:var(--radius);
  padding:30px;position:relative;overflow:hidden;transition:.35s var(--ease);
}
.card::before{content:"";position:absolute;inset:0;background:radial-gradient(circle at 50% 0,rgba(56,210,255,.1),transparent 55%);opacity:0;transition:.4s}
.card:hover{transform:translateY(-6px);border-color:rgba(51,194,255,.45);box-shadow:var(--shadow)}
.card:hover::before{opacity:1}
.card .icon{
  width:54px;height:54px;border-radius:14px;background:rgba(46,109,255,.16);
  display:grid;place-items:center;margin-bottom:18px;border:1px solid rgba(51,194,255,.25);
  transition:.35s;
}
.card:hover .icon{background:var(--grad);box-shadow:0 10px 24px -8px rgba(56,210,255,.6)}
.card .icon svg{width:26px;height:26px;stroke:var(--cyan)}
.card:hover .icon svg{stroke:#fff}
.card h3{font-size:18px;font-weight:700;margin-bottom:10px}
.card p{color:var(--text-2);font-size:14.5px}

/* ---------- 解决方案集合 ---------- */
.sol-list{display:grid;grid-template-columns:repeat(4,1fr);gap:18px;position:relative;z-index:1}
.sol-item{
  display:flex;align-items:center;gap:12px;padding:18px 20px;
  background:var(--panel);border:1px solid var(--line);border-radius:14px;
  font-weight:600;font-size:15px;color:var(--text);transition:.3s var(--ease);
}
.sol-item .k{color:var(--text-3);font-size:18px}
.sol-item:hover{transform:translateY(-3px);border-color:rgba(51,194,255,.4);color:var(--cyan);box-shadow:var(--shadow)}
.sol-item:hover .k{color:var(--cyan)}

/* ---------- 特性 ---------- */
.feat{display:flex;gap:14px;align-items:flex-start;padding:22px 0;border-top:1px solid var(--line)}
.feat .num{font-size:13px;color:var(--cyan);font-weight:700;letter-spacing:1px;flex-shrink:0;width:34px;padding-top:4px}
.feat h4{font-size:17px;font-weight:700;margin-bottom:6px}
.feat p{color:var(--text-2);font-size:14px}

/* ---------- 关于预览 ---------- */
.about-wrap{display:grid;grid-template-columns:1fr 1fr;gap:64px;align-items:center}
.about-art{position:relative}
.about-art .node{position:absolute;width:10px;height:10px;border-radius:50%;background:var(--cyan);box-shadow:0 0 16px var(--cyan);animation:pulse 3s infinite}
.about-copy .lead{color:var(--text-2);font-size:16px;margin-bottom:20px;line-height:1.9}
.about-copy .lead b{color:#fff;font-weight:600}
.about-points{list-style:none;margin-top:8px;display:grid;gap:12px}
.about-points li{display:flex;gap:12px;color:var(--text-2)}
.about-points li svg{width:20px;height:20px;stroke:var(--cyan);flex-shrink:0;margin-top:3px}

/* ---------- CTA ---------- */
.cta{
  position:relative;text-align:center;padding:88px 0;overflow:hidden;
  background:linear-gradient(160deg,var(--blue),var(--cyan-2));
}
.cta::before{content:"";position:absolute;inset:0;background-image:radial-gradient(rgba(255,255,255,.25) 1px,transparent 1px);background-size:26px 26px;opacity:.35}
.cta .container{position:relative;z-index:1}
.cta h2{font-size:clamp(26px,3.4vw,40px);font-weight:800;color:#fff;margin-bottom:14px}
.cta p{color:rgba(255,255,255,.9);margin-bottom:32px;font-size:17px}
.cta .btn{background:#fff;color:var(--blue);box-shadow:0 14px 30px -10px rgba(0,0,0,.4)}
.cta .btn:hover{transform:translateY(-2px)}

/* ---------- 页脚 ---------- */
.site-footer{background:var(--bg-2);border-top:1px solid var(--line);padding:64px 0 0;position:relative;overflow:hidden}
.site-footer::before{content:"";position:absolute;left:0;right:0;bottom:0;height:1px;background:linear-gradient(90deg,transparent,rgba(51,194,255,.4),transparent)}
.foot-grid{display:grid;grid-template-columns:2fr 1fr 1fr 1.4fr;gap:40px;padding-bottom:48px}
.foot-brand .brand{margin-bottom:16px}
.foot-brand p{color:var(--text-2);font-size:14px;max-width:320px}
.foot-col h4{font-size:14px;color:#fff;font-weight:700;margin-bottom:16px;letter-spacing:.5px}
.foot-col ul{list-style:none;display:grid;gap:10px}
.foot-col a{color:var(--text-2);font-size:14px;transition:.25s}
.foot-col a:hover{color:var(--cyan)}
.foot-contact li{display:flex;gap:10px;color:var(--text-2);font-size:14px;margin-bottom:12px}
.foot-contact svg{width:18px;height:18px;stroke:var(--cyan);flex-shrink:0;margin-top:3px}
.foot-bottom{display:flex;justify-content:space-between;align-items:center;gap:16px;flex-wrap:wrap;padding:20px 0;border-top:1px solid var(--line);color:var(--text-3);font-size:13px}
.foot-bottom .icp a{color:var(--text-3);margin-left:10px}

/* ---------- 内页 Hero ---------- */
.page-hero{position:relative;padding:150px 0 72px;overflow:hidden;background:linear-gradient(180deg,var(--bg-2),var(--bg))}
.page-hero h1{font-size:clamp(30px,4vw,46px);font-weight:800;margin-bottom:14px}
.page-hero p{color:var(--text-2);max-width:680px;font-size:16px}
.breadcrumb{display:flex;gap:8px;color:var(--text-3);font-size:13px;margin-bottom:20px}
.breadcrumb a:hover{color:var(--cyan)}
.breadcrumb span{color:var(--text-3)}

/* ---------- 接线块（详情） ---------- */
.side-grid{display:grid;grid-template-columns:1fr 340px;gap:48px;position:relative;z-index:1}
.content-block h2{font-size:26px;font-weight:800;margin-bottom:16px}
.content-block h3{font-size:20px;font-weight:700;margin:30px 0 12px;color:#fff}
.content-block p{color:var(--text-2);margin-bottom:16px}
.content-block p b{color:#fff}
.sticky-card{position:sticky;top:96px}

/* ---------- 联系方式页 ---------- */
.contact-grid{display:grid;grid-template-columns:1fr 1fr;gap:48px;position:relative;z-index:1}
.info-card{background:var(--panel);border:1px solid var(--line);border-radius:var(--radius);padding:30px;margin-bottom:20px;display:flex;gap:18px;align-items:flex-start}
.info-card .ic{width:48px;height:48px;border-radius:12px;background:rgba(46,109,255,.16);display:grid;place-items:center;flex-shrink:0}
.info-card .ic svg{width:22px;height:22px;stroke:var(--cyan)}
.info-card b{display:block;font-size:16px;margin-bottom:4px}
.info-card span{color:var(--text-2);font-size:14px}
.info-card span a{color:var(--text-2);text-decoration:none;transition:color .2s}
.info-card span a:hover{color:var(--cyan)}
.form-card{background:var(--panel);border:1px solid var(--line);border-radius:var(--radius);padding:34px}
.form-card h3{font-size:20px;font-weight:700;margin-bottom:8px}
.form-card .sub{color:var(--text-2);font-size:14px;margin-bottom:24px}
.form-grid{display:grid;grid-template-columns:1fr 1fr;gap:16px}
.field{display:grid;gap:8px}
.field.full{grid-column:1/-1}
.field label{font-size:13px;color:var(--text-2)}
.field input,.field textarea{
  background:var(--bg);border:1px solid var(--line);border-radius:10px;padding:12px 14px;
  color:var(--text);font-size:14px;font-family:inherit;transition:.3s;width:100%;
}
.field input:focus,.field textarea:focus{outline:none;border-color:var(--cyan);box-shadow:0 0 0 3px rgba(51,194,255,.15)}
.field textarea{resize:vertical;min-height:110px}
.form-msg{display:none;margin-top:12px;padding:10px 14px;border-radius:10px;font-size:14px;line-height:1.5}
.form-msg-ok{display:block;background:rgba(38,201,150,.1);border:1px solid rgba(38,201,150,.4);color:#2ecc9e}
.form-msg-error{display:block;background:rgba(239,88,88,.1);border:1px solid rgba(239,88,88,.4);color:#ff7d7d}

/* ---------- 404 ---------- */
.err{min-height:100vh;display:grid;place-items:center;text-align:center;position:relative}
.err h1{font-size:clamp(80px,16vw,160px);font-weight:900;background:var(--grad);-webkit-background-clip:text;background-clip:text;color:transparent;line-height:1}
.err p{margin:16px 0 30px;color:var(--text-2);max-width:440px}

/* ---------- 入场动画 ---------- */
.reveal{opacity:0;transform:translateY(28px);transition:.7s var(--ease)}
.reveal.in{opacity:1;transform:none}

@keyframes pulse{0%,100%{opacity:1}50%{opacity:.4}}

/* ---------- 响应式 ---------- */
@media(max-width:1024px){
  .grid-3,.grid-4{grid-template-columns:repeat(2,1fr)}
  .sol-list{grid-template-columns:repeat(3,1fr)}
  .about-wrap,.contact-grid,.side-grid{grid-template-columns:1fr}
  .sticky-card{position:static;margin-top:40px}
}
@media(max-width:768px){
  .nav-links{
    position:fixed;top:0;right:-100%;height:100vh;width:min(320px,82vw);
    background:var(--bg-2);flex-direction:column;align-items:flex-start;justify-content:center;
    gap:30px;padding:40px;transition:.4s var(--ease);border-left:1px solid var(--line);
  }
  .nav-links.open{right:0}
  .nav-toggle{display:grid}
  .nav-cta{margin-top:16px}
  .lang-menu{right:auto;left:0}
  .grid-3,.grid-4{grid-template-columns:1fr}
  .sol-list{grid-template-columns:repeat(2,1fr)}
  .hero-stats{gap:28px}
  .foot-grid{grid-template-columns:1fr 1fr}
  .section{padding:64px 0}
}

@media(prefers-reduced-motion:reduce){
  *{animation:none!important;transition:none!important}
  .reveal{opacity:1;transform:none}
}

/* ============================================================
   高端区块链科技视觉升级（图片 + 动画）
   ============================================================ */

/* ---------- 粒子网络画布 ---------- */
.particles{position:absolute;inset:0;z-index:0;overflow:hidden;pointer-events:none}
.hero>.particles,.page-hero>.particles{z-index:1}
.hero .container,.page-hero .container{z-index:2}

/* ---------- hero 主视觉图（图1） ---------- */
.hero.main-hero{background:
  linear-gradient(180deg,rgba(11,20,38,.72),rgba(11,20,38,.9) 62%,var(--bg) 100%),
  url('../images/tech/hero-network.jpg') center/cover no-repeat;
  background-attachment:fixed;
}

/* ---------- 视觉配图卡 ---------- */
.vis-img{position:relative;border-radius:var(--radius);overflow:hidden;border:1px solid var(--line)}
.vis-img::after{content:"";position:absolute;inset:0;background:linear-gradient(180deg,rgba(11,20,38,.05),rgba(11,20,38,.55));pointer-events:none}
.vis-img img{width:100%;height:100%;object-fit:cover;display:block}
.vis-img .cap{position:absolute;left:0;right:0;bottom:0;z-index:2;padding:20px 24px;color:#fff;font-weight:600;letter-spacing:.5px}

/* ---------- 渐变流动文字（标题） ---------- */
.grad-flow{
  background:linear-gradient(90deg,#2E6DFF,#38D2FF,#5ee0ff,#2E6DFF);
  background-size:300% 100%;
  -webkit-background-clip:text;background-clip:text;color:transparent;
  animation:grad-flow 6s linear infinite;
}
@keyframes grad-flow{0%{background-position:0 0}100%{background-position:300% 0}}

/* ---------- 按钮扫光 ---------- */
.btn-shine{position:relative;overflow:hidden}
.btn-shine::after{content:"";position:absolute;top:0;left:-80%;width:50%;height:100%;background:linear-gradient(100deg,transparent,rgba(255,255,255,.38),transparent);transform:skewX(-20deg);transition:none}
.btn-shine:hover::after{animation:btn-shine .9s var(--ease)}
@keyframes btn-shine{0%{left:-80%}100%{left:130%}}

/* ---------- 卡片悬浮发光（升级） ---------- */
.card.glow,.tech-card.glow{
  box-shadow:0 0 0 1px rgba(51,194,255,.0);
  transition:transform .4s var(--ease),box-shadow .4s var(--ease),border-color .4s;
}
.card.glow::after{
  content:"";position:absolute;inset:0;border-radius:inherit;pointer-events:none;
  background:radial-gradient(220px circle at var(--mx,50%) var(--my,50%),rgba(56,210,255,.22),transparent 0);
  opacity:0;transition:opacity .3s;
}
.card.glow:hover::after{opacity:1}
.card.glow:hover{transform:translateY(-8px);border-color:rgba(51,194,255,.6);box-shadow:0 22px 60px -18px rgba(46,109,255,.65),0 0 30px -6px rgba(56,210,255,.35)}

/* ---------- 卡片交错入场 ---------- */
.stagger .reveal,.card.glow.reveal{transition-delay:inherit}
.card.glow.reveal:nth-child(2){transition-delay:.08s}
.card.glow.reveal:nth-child(3){transition-delay:.16s}
.card.glow.reveal:nth-child(4){transition-delay:.24s}
.card.glow.reveal:nth-child(5){transition-delay:.32s}
.card.glow.reveal:nth-child(6){transition-delay:.4s}

/* ---------- 分层入场：上浮 + 模糊清晰 + 扫光 ---------- */
.reveal.motion{opacity:0;transform:translateY(34px) scale(.995);filter:blur(8px);transition:opacity .8s var(--ease),transform .8s var(--ease),filter .8s var(--ease)}
.reveal.motion.in{opacity:1;transform:none;filter:blur(0)}
.reveal.motion{position:relative}
/* 扫光 */
.reveal.motion::before{content:"";position:absolute;left:0;top:0;height:100%;width:60%;background:linear-gradient(100deg,transparent,rgba(56,210,255,.12),transparent);transform:translateX(-120%) skewX(-15deg);opacity:0;pointer-events:none}
.reveal.motion.in::before{animation:sheen 1.1s var(--ease) .25s forwards}
@keyframes sheen{to{transform:translateX(220%) skewX(-15deg);opacity:1}}

/* ---------- 数字滚动计数 ---------- */
.stat b[data-count]{background:none;-webkit-background-clip:unset;background-clip:unset;color:var(--cyan);text-shadow:0 0 22px rgba(56,210,255,.35)}
.stat.gold b[data-count]{color:var(--gold);text-shadow:0 0 22px rgba(245,182,74,.35)}

/* ---------- 节点连线 SVG 动画 ---------- */
.node-graph{width:100%;max-width:460px}
.node-graph path{stroke:var(--cyan);stroke-width:1.4;fill:none;stroke-dasharray:6 6;animation:flow 3s linear infinite}
.node-graph .n{fill:url(#ngrad);opacity:.9}
@keyframes flow{to{stroke-dashoffset:-36}}
.node-graph circle{filter:drop-shadow(0 0 6px rgba(56,210,255,.7))}

/* ---------- 节点图容器（services 用） ---------- */
.tech-visual{display:grid;grid-template-columns:1fr 1fr;gap:48px;align-items:center;padding:36px 0 8px}
.page-hero.img-hero{
  background:
    linear-gradient(180deg,rgba(10,20,40,.88),rgba(11,20,38,.96) 78%,var(--bg) 100%),
    url('../images/tech/topology.jpg') center/cover no-repeat;
  background-attachment:scroll;
}
.page-hero.img-hero[data-bg="dataflow"]{
  background:
    linear-gradient(180deg,rgba(10,20,40,.88),rgba(11,20,38,.95) 80%,var(--bg) 100%),
    url('../images/tech/dataflow.jpg') center/cover no-repeat;
}
.page-hero.img-hero[data-bg="chains"]{
  background:
    linear-gradient(180deg,rgba(10,20,40,.86),rgba(11,20,38,.94) 80%,var(--bg) 100%),
    url('../images/tech/chains.jpg') center/cover no-repeat;
}
.page-hero.img-hero[data-bg="globe"]{
  background:
    linear-gradient(180deg,rgba(10,20,40,.86),rgba(11,20,38,.94) 78%,var(--bg) 100%),
    url('../images/tech/globe.jpg') center/cover no-repeat;
}

/* ---------- 数据流动画（solutions） ---------- */
.flow-line{position:relative;height:4px;border-radius:4px;background:rgba(51,194,255,.15);overflow:hidden}
.flow-line::before{content:"";position:absolute;top:0;left:-40%;width:40%;height:100%;background:linear-gradient(90deg,transparent,#38D2FF,transparent);animation:flow-w .25s none}
.flow-line.anim::before{animation:flow-sweep 2.2s var(--ease) infinite}
@keyframes flow-sweep{0%{left:-40%}100%{left:110%}}
.flow-dots{position:relative;height:2px;background:transparent}
.flow-dots i{position:absolute;width:8px;height:8px;border-radius:50%;background:var(--cyan);box-shadow:0 0 12px var(--cyan);top:-3px}
.flow-dots i:nth-child(1){left:12%;animation:dot-move 4s linear infinite}
.flow-dots i:nth-child(2){left:56%;animation:dot-move 4s linear infinite 1.3s}
.flow-dots i:nth-child(3){left:30%;animation:dot-move 4s linear infinite 2.6s}
@keyframes dot-move{0%{transform:translateX(0);opacity:0}10%{opacity:1}90%{opacity:1}100%{transform:translateX(180px);opacity:0}}

/* ---------- 3D 倾斜 ---------- */
.tilt{transform-style:preserve-3d;transition:transform .18s ease-out}

/* ---------- 滚动视差 ---------- */
.parallax{will-change:transform}

/* ---------- 数据上链流程图（services） ---------- */
.chain-flow{display:flex;align-items:center;gap:14px;flex-wrap:wrap;margin-top:22px}
.chain-flow .cf{flex:1;min-width:120px;padding:16px 18px;background:var(--panel);border:1px solid var(--line);border-radius:12px;text-align:center;font-size:13.5px;color:var(--text-2);position:relative;transition:.3s}
.chain-flow .cf b{display:block;font-size:16px;color:#fff;margin-bottom:4px}
.chain-flow .cf::after{content:"→";position:absolute;right:-22px;top:50%;transform:translateY(-50%);color:var(--cyan);font-weight:700}
.chain-flow .cf:last-child::after{content:""}
.chain-flow .cf:hover{border-color:rgba(51,194,255,.5);transform:translateY(-3px)}

/* ---------- 关于视觉 ---------- */
.about-main{display:grid;grid-template-columns:1.05fr 1fr;gap:56px;align-items:center}
.about-main .vis-img{min-height:360px}

/* ---------- contact 轻量化粒子背景 ---------- */
.contact-wrap{position:relative;z-index:1}

/* ---------- 移动端禁用 / 降级 ---------- */
@media(max-width:768px){
  .hero.main-hero{background-attachment:scroll}
  .particles{opacity:.55}
  .tech-visual,.about-main{grid-template-columns:1fr}
  .node-graph{margin-top:20px}
}