/* ============ 基础变量 ============ */
:root{
  --c-primary:#1b72df;
  --c-primary-dark:#0d4cd4;
  --c-accent:#0ea5e9;
  --c-cyan:#06b6d4;
  --c-text:#1a1a2e;
  --c-text-2:#4b5363;
  --c-text-3:#7a8497;
  --c-line:#e6ebf2;
  --c-bg:#ffffff;
  --c-bg-soft:#f6f9fd;
  --c-bg-tint:#eef4fc;
  --grad-blue:linear-gradient(135deg,#1b72df 0%,#0d4cd4 100%);
  --grad-blue-soft:linear-gradient(135deg,#eaf2fe 0%,#f6f9fd 100%);
  --grad-hero:linear-gradient(135deg,#0d4cd4 0%,#1b72df 50%,#0ea5e9 100%);
  --shadow-sm:0 4px 12px rgba(13,76,212,.06);
  --shadow-md:0 10px 30px rgba(13,76,212,.10);
  --shadow-lg:0 24px 60px rgba(13,76,212,.15);
  --radius:14px;
  --radius-lg:22px;
  --maxw:1240px;
  --header-h:72px;
  --safe-top:env(safe-area-inset-top, 0px);
  --header-h-safe:calc(var(--header-h) + var(--safe-top));
  --ease:cubic-bezier(.22,.61,.36,1);
}
*,*::before,*::after{box-sizing:border-box}
html{scroll-behavior:smooth}
body{
  margin:0;font-family:-apple-system,BlinkMacSystemFont,"PingFang SC","Microsoft YaHei",Segoe UI,Roboto,sans-serif;
  color:var(--c-text);background:var(--c-bg);line-height:1.65;
  -webkit-font-smoothing:antialiased;
}
a{color:inherit;text-decoration:none}
img,svg{display:block;max-width:100%}
h1,h2,h3,h4,h5{margin:0;line-height:1.3;color:var(--c-text);font-weight:700}
h1{font-size:clamp(36px,5vw,60px);letter-spacing:-1px}
h2{font-size:clamp(28px,3.4vw,44px);letter-spacing:-.5px}
h2 em,h1 em{font-style:normal;color:var(--c-primary)}
p{margin:0;color:var(--c-text-2)}
.container{max-width:var(--maxw);margin:0 auto;padding:0 24px}
.section{padding:96px 0}
@media (max-width:768px){.section{padding:64px 0}}

/* ============ 通用按钮 ============ */
.btn{
  display:inline-flex;align-items:center;gap:6px;
  padding:10px 22px;border-radius:999px;font-size:14px;font-weight:600;
  transition:all .25s var(--ease);cursor:pointer;border:1.5px solid transparent;
  white-space:nowrap;
}
.btn-primary{background:var(--grad-blue);color:#fff;box-shadow:0 8px 20px rgba(27,114,223,.3)}
.btn-primary:hover{transform:translateY(-2px);box-shadow:0 14px 28px rgba(27,114,223,.4)}
.btn-ghost{background:transparent;color:var(--c-primary);border-color:rgba(27,114,223,.3)}
.btn-ghost:hover{background:rgba(27,114,223,.08);border-color:var(--c-primary)}
.btn-white{background:#fff;color:var(--c-primary)}
.btn-white:hover{transform:translateY(-2px);box-shadow:0 14px 28px rgba(0,0,0,.2)}
.btn-ghost-white{background:transparent;color:#fff;border-color:rgba(255,255,255,.4)}
.btn-ghost-white:hover{background:rgba(255,255,255,.12)}
.btn-lg{padding:14px 30px;font-size:15px}

/* ============ 通用板块头 ============ */
.sec-head{text-align:center;max-width:780px;margin:0 auto 56px}
.sec-head h2{margin:12px 0 14px}
.sec-head p{color:var(--c-text-3);font-size:16px}
.sec-head.row{display:flex;align-items:flex-end;justify-content:space-between;text-align:left;max-width:none;margin-bottom:40px}
.sec-head.row h2{margin-top:8px}
.eyebrow{
  display:inline-block;font-size:12px;letter-spacing:2px;font-weight:700;
  color:var(--c-primary);text-transform:uppercase;position:relative;padding-left:28px;
}
.eyebrow::before{content:"";position:absolute;left:0;top:50%;width:20px;height:2px;background:var(--c-primary);transform:translateY(-50%)}
.eyebrow.light{color:#a8c8ff}
.eyebrow.light::before{background:#a8c8ff}
.sec-more{color:var(--c-primary);font-weight:600;font-size:15px;transition:gap .2s;display:inline-flex;align-items:center;gap:4px}
.sec-more:hover{gap:10px}

/* ============ 顶部导航 ============ */
.nav{
  position:fixed;top:var(--safe-top);left:0;right:0;z-index:100;
  height:var(--header-h);
  border-bottom:1px solid transparent;transition:all .3s var(--ease);
}
/* 毛玻璃背景放在伪元素上，避免 iOS Safari backdrop-filter 把背景层盖到 logo 之上 */
.nav::before{
  content:"";position:absolute;top:0;right:0;bottom:0;left:0;z-index:-1;
  background:rgba(255,255,255,.85);
  -webkit-backdrop-filter:saturate(180%) blur(14px);
  backdrop-filter:saturate(180%) blur(14px);
}
.nav.scrolled::before{background:rgba(255,255,255,.95)}
.nav.scrolled{border-bottom-color:var(--c-line);box-shadow:var(--shadow-sm)}
.nav-inner{display:flex;align-items:center;justify-content:space-between;height:100%}
.logo{display:inline-flex;align-items:center;gap:10px;color:var(--c-primary)}
.logo-mark{width:40px;height:44px;display:inline-flex;align-items:center;justify-content:center}
.logo-mark img{display:block;width:100%;height:100%;object-fit:contain;object-position:center 45%}
.foot-brand .logo-mark img{filter:brightness(0) invert(1)}
.logo-text strong{display:block;font-size:17px;letter-spacing:1px;color:var(--c-text)}
.logo-text em{display:block;font-size:9px;letter-spacing:2px;color:var(--c-text-3);font-style:normal;margin-top:1px}
.menu{display:flex;gap:38px}
.menu a{font-size:15px;font-weight:500;color:var(--c-text-2);position:relative;padding:6px 0;transition:color .2s}
.menu a:hover{color:var(--c-primary)}
.menu a.active{color:var(--c-primary)}
.menu a.active::after,.menu a:hover::after{
  content:"";position:absolute;left:50%;bottom:-2px;width:18px;height:2px;background:var(--c-primary);
  border-radius:2px;transform:translateX(-50%);
}
.burger{display:none;flex-direction:column;gap:5px;width:32px;height:32px;background:transparent;border:0;cursor:pointer;padding:0;align-items:center;justify-content:center}
.burger span{width:22px;height:2px;background:var(--c-text);border-radius:2px;transition:transform .2s}

/* ============ Hero ============ */
.hero{
  position:relative;padding:calc(var(--header-h-safe) + 80px) 0 100px;
  background:linear-gradient(180deg,#f6f9fd 0%,#ffffff 100%);
  overflow:hidden;
}
.hero-bg{position:absolute;top:0;right:0;bottom:0;left:0;pointer-events:none}
.blob{position:absolute;border-radius:50%;filter:blur(80px);opacity:.5}
.blob-1{width:520px;height:520px;background:radial-gradient(circle,#7fb6ff 0%,transparent 70%);top:-150px;right:-100px;animation:float 14s ease-in-out infinite}
.blob-2{width:380px;height:380px;background:radial-gradient(circle,#a8c8ff 0%,transparent 70%);bottom:-100px;left:-100px;animation:float 18s ease-in-out infinite reverse}
.blob-3{width:280px;height:280px;background:radial-gradient(circle,#0ea5e9 0%,transparent 70%);top:40%;left:35%;opacity:.25;animation:float 22s ease-in-out infinite}
.grid-overlay{
  position:absolute;top:0;right:0;bottom:0;left:0;background-image:
    linear-gradient(rgba(27,114,223,.05) 1px,transparent 1px),
    linear-gradient(90deg,rgba(27,114,223,.05) 1px,transparent 1px);
  background-size:48px 48px;
  mask-image:radial-gradient(ellipse 80% 60% at 50% 50%,#000 30%,transparent 80%);
  -webkit-mask-image:radial-gradient(ellipse 80% 60% at 50% 50%,#000 30%,transparent 80%);
}
@keyframes float{0%,100%{transform:translate(0,0)}50%{transform:translate(20px,-30px)}}
.hero-inner{display:grid;grid-template-columns:1.1fr 1fr;gap:60px;align-items:center;position:relative;z-index:1}
.hero-text .lead{margin:20px 0 32px;font-size:17px;line-height:1.8;max-width:520px}
.hero-actions{display:flex;gap:14px;flex-wrap:wrap}
.hero-trust{display:flex;gap:36px;margin:48px 0 0;padding:24px 0 0;border-top:1px dashed var(--c-line);list-style:none}
.hero-trust li{font-size:13px;color:var(--c-text-3);line-height:1.5}
.hero-trust span{font-size:26px;font-weight:700;color:var(--c-primary);font-family:-apple-system,sans-serif}
.hero-visual{position:relative}
.hero-svg{width:100%;height:auto;filter:drop-shadow(0 30px 50px rgba(13,76,212,.2))}
.float-1,.float-2,.float-3{transform-origin:center;transform-box:fill-box}
.float-1{animation:float 6s ease-in-out infinite}
.float-2{animation:float 8s ease-in-out infinite reverse;animation-delay:1s}
.float-3{animation:float 7s ease-in-out infinite;animation-delay:2s}
.scroll-cue{
  position:absolute;bottom:24px;left:50%;transform:translateX(-50%);
  width:26px;height:42px;border:2px solid var(--c-primary);border-radius:14px;display:flex;justify-content:center;
}
.scroll-cue span{
  width:3px;height:8px;background:var(--c-primary);border-radius:2px;margin-top:6px;
  animation:cue 1.8s ease-in-out infinite;
}
@keyframes cue{0%,100%{transform:translateY(0);opacity:1}50%{transform:translateY(10px);opacity:.3}}
@media (max-width:960px){
  .hero-inner{grid-template-columns:1fr;text-align:center}
  .hero-text .lead,.hero-actions,.hero-trust{margin-left:auto;margin-right:auto}
  .hero-actions,.hero-trust{justify-content:center}
  .hero-visual{order:-1;max-width:420px;margin:0 auto}
}

/* ============ 客户 logo 墙 ============ */
.clients{padding:36px 0;background:#fff;border-top:1px solid var(--c-line);border-bottom:1px solid var(--c-line)}
.clients-title{text-align:center;color:var(--c-text-3);font-size:13px;letter-spacing:2px;margin-bottom:18px}
.logo-row{display:flex;flex-wrap:wrap;justify-content:center;gap:14px 48px;align-items:center}
.logo-row span{
  font-size:18px;font-weight:600;color:#9aa3b2;letter-spacing:1px;
  transition:color .2s;cursor:default;
}
.logo-row span:hover{color:var(--c-primary)}

/* ============ 数据条 ============ */
.stats{padding:64px 0;background:var(--grad-blue);color:#fff;position:relative;overflow:hidden}
.stats::before{
  content:"";position:absolute;top:0;right:0;bottom:0;left:0;background-image:
    radial-gradient(circle at 20% 50%,rgba(255,255,255,.1) 0%,transparent 50%),
    radial-gradient(circle at 80% 50%,rgba(255,255,255,.1) 0%,transparent 50%);
}
.stats-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:20px;position:relative;z-index:1}
.stat{text-align:center;padding:24px 16px;position:relative}
.stat+.stat::before{
  content:"";position:absolute;left:0;top:20%;height:60%;width:1px;background:rgba(255,255,255,.2);
}
.stat .num{font-size:52px;font-weight:800;line-height:1;letter-spacing:-1px;font-family:-apple-system,sans-serif}
.stat .lbl{font-size:18px;font-weight:600;margin-top:12px;color:#fff}
.stat .desc{font-size:13px;color:rgba(255,255,255,.75);margin-top:6px;line-height:1.6}
@media (max-width:768px){
  .stats-grid{grid-template-columns:repeat(2,1fr);gap:32px}
  .stat .num{font-size:40px}
}

/* ============ 板块头入场动画 ============ */
.reveal{opacity:0;transform:translateY(24px);transition:opacity .7s var(--ease),transform .7s var(--ease)}
.reveal.in{opacity:1;transform:none}

/* ============ 主营业务：全部产品线 ============ */
.section-business{background:var(--c-bg-soft)}
.biz-prod-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:24px}
.biz-prod-card{
  display:flex;flex-direction:column;background:#fff;border:1px solid var(--c-line);
  border-radius:var(--radius-lg);transition:all .3s var(--ease);overflow:hidden;height:100%;
}
.biz-prod-card:hover{transform:translateY(-4px);box-shadow:var(--shadow-md);border-color:transparent}
.biz-prod-cover{
  aspect-ratio:16/10;overflow:hidden;background:var(--grad-blue-soft);
  display:flex;align-items:center;justify-content:center;position:relative;
}
.biz-prod-cover img{width:100%;height:100%;object-fit:cover;display:block}
.biz-prod-cover svg{width:56px;height:56px;color:var(--c-primary)}
.biz-prod-body{padding:18px 20px 22px;text-align:center}
.biz-prod-body h4{font-size:17px;margin:0;line-height:1.45}
.biz-prod-card:hover .biz-prod-body h4{color:var(--c-primary)}
@media (max-width:1100px){.biz-prod-grid{grid-template-columns:repeat(3,1fr)}}
@media (max-width:768px){.biz-prod-grid{grid-template-columns:repeat(2,1fr);gap:18px}}
@media (max-width:480px){.biz-prod-grid{grid-template-columns:1fr}}

/* ============ 产品中心 ============ */
.prod-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:20px}
.prod-card{
  position:relative;padding:28px 24px;background:#fff;border-radius:var(--radius);
  border:1px solid var(--c-line);transition:all .3s var(--ease);display:block;overflow:hidden;
}
.prod-card::after{
  content:"";position:absolute;left:0;right:0;top:0;height:3px;background:var(--grad-blue);
  transform:scaleX(0);transition:transform .35s;transform-origin:left;
}
.prod-card:hover{transform:translateY(-4px);box-shadow:var(--shadow-md);border-color:transparent}
.prod-card:hover::after{transform:scaleX(1)}
.prod-cover{
  aspect-ratio:16/10;overflow:hidden;background:var(--grad-blue-soft);
  display:flex;align-items:center;justify-content:center;position:relative;
}
.prod-cover img{width:100%;height:100%;object-fit:cover;display:block}
.prod-cover svg{width:64px;height:64px;color:var(--c-primary)}
.prod-body{padding:18px 22px 22px;display:flex;flex-direction:column;gap:8px;flex:1}
.prod-card h4{font-size:17px;margin:0}
.prod-card p{font-size:13px;color:var(--c-text-3);margin:0;line-height:1.6;
  display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden;
}
.prod-tag{
  font-size:11px;padding:3px 10px;width:fit-content;
  background:var(--c-bg-tint);color:var(--c-text-3);border-radius:999px;font-weight:500;
}
@media (max-width:960px){.prod-grid{grid-template-columns:repeat(2,1fr)}}
@media (max-width:480px){.prod-grid{grid-template-columns:1fr}}

/* ============ 行业方案 ============ */
.section-solutions{background:#fff}
.sol-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:20px}
.sol-card{
  display:flex;flex-direction:column;background:#fff;border-radius:var(--radius);
  border:1px solid var(--c-line);transition:all .3s var(--ease);display:block;overflow:hidden;height:100%;
}
.sol-card:hover{transform:translateY(-4px);border-color:transparent;box-shadow:var(--shadow-md)}
.sol-cover{
  aspect-ratio:16/10;overflow:hidden;background:var(--c-bg-soft);
  display:flex;align-items:center;justify-content:center;position:relative;
}
.sol-cover img{width:100%;height:100%;object-fit:cover;display:block}
.sol-cover svg{width:52px;height:52px;color:var(--c-primary)}
.sol-body{padding:20px 22px 24px;display:flex;flex-direction:column;gap:8px;flex:1}
.sol-card h4{font-size:17px;margin:0;transition:color .3s}
.sol-card:hover .sol-body h4{color:var(--c-primary)}
.sol-card p{font-size:13px;line-height:1.6;color:var(--c-text-3);margin:0;
  display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden;
}
@media (max-width:960px){.sol-grid{grid-template-columns:repeat(2,1fr)}}
@media (max-width:480px){.sol-grid{grid-template-columns:1fr}}

/* ============ 核心技术 ============ */
.section-tech{background:var(--c-bg-soft);position:relative}
.section-tech::before{
  content:"";position:absolute;top:80px;left:0;width:200px;height:200px;border-radius:50%;
  background:radial-gradient(circle,rgba(27,114,223,.08) 0%,transparent 70%);
}
.tech-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:24px;position:relative;z-index:1}
.tech-item{
  padding:32px 28px;background:#fff;border-radius:var(--radius);
  border:1px solid var(--c-line);transition:all .3s var(--ease);position:relative;overflow:hidden;
}
.tech-item:hover{transform:translateY(-4px);box-shadow:var(--shadow-md);border-color:rgba(27,114,223,.2)}
.tech-num{
  font-size:38px;font-weight:800;color:transparent;
  -webkit-text-stroke:1.5px var(--c-primary);line-height:1;margin-bottom:14px;
  font-family:-apple-system,sans-serif;
}
.tech-item h4{font-size:18px;margin-bottom:8px}
.tech-item p{font-size:14px;line-height:1.7}
/* 平板：3 列卡太窄，先降到 2 列过渡（必须写在下方 768px 单列规则之前） */
@media (max-width:960px){.tech-grid{grid-template-columns:repeat(2,1fr)}}
@media (max-width:768px){.tech-grid{grid-template-columns:1fr}}

/* ============ 关于我们 banner ============ */
.about-banner{
  padding:96px 0;background:var(--grad-blue);color:#fff;position:relative;overflow:hidden;
}
.about-banner::before{
  content:"";position:absolute;top:0;right:0;bottom:0;left:0;opacity:.15;
  background-image:
    linear-gradient(rgba(255,255,255,.6) 1px,transparent 1px),
    linear-gradient(90deg,rgba(255,255,255,.6) 1px,transparent 1px);
  background-size:60px 60px;
  mask-image:linear-gradient(180deg,#000 0%,transparent 100%);
  -webkit-mask-image:linear-gradient(180deg,#000 0%,transparent 100%);
}
.about-banner::after{
  content:"";position:absolute;right:-200px;top:50%;transform:translateY(-50%);
  width:600px;height:600px;border-radius:50%;
  background:radial-gradient(circle,rgba(255,255,255,.08) 0%,transparent 70%);
}
.about-inner{display:grid;grid-template-columns:1.2fr 1fr;gap:60px;align-items:center;position:relative;z-index:1}
.about-text h2{color:#fff;margin:14px 0 20px}
.about-text h2 em{color:#a8c8ff}
.about-text p{color:rgba(255,255,255,.85);font-size:16px;line-height:1.8;margin-bottom:24px}
.about-points{list-style:none;padding:0;margin:0 0 32px;display:flex;flex-direction:column;gap:10px}
.about-points li{display:flex;align-items:center;gap:10px;color:#fff;font-size:15px}
.about-points span{
  width:22px;height:22px;border-radius:50%;background:rgba(255,255,255,.2);color:#fff;
  display:inline-flex;align-items:center;justify-content:center;font-size:12px;flex-shrink:0;
}
.about-stats{display:grid;grid-template-columns:1fr 1fr;gap:20px}
.ast{
  padding:28px 20px;background:rgba(255,255,255,.1);border:1px solid rgba(255,255,255,.2);
  border-radius:var(--radius);backdrop-filter:blur(10px);-webkit-backdrop-filter:blur(10px);
  text-align:center;
}
.ast b{display:block;font-size:38px;font-weight:800;line-height:1;letter-spacing:-1px}
.ast span{display:block;font-size:13px;color:rgba(255,255,255,.85);margin-top:8px}
@media (max-width:768px){
  .about-inner{grid-template-columns:1fr;text-align:center}
  .about-points li{justify-content:center}
}

/* ============ 新闻中心：等宽卡片（微信二维码已统一移到页脚右侧） ============ */
.section-news{background:#fff}
.news-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:20px}
.news-card{
  background:#fff;border:1px solid var(--c-line);border-radius:var(--radius);
  overflow:hidden;transition:all .3s var(--ease);display:block;
}
.news-card:hover{transform:translateY(-4px);box-shadow:var(--shadow-md);border-color:rgba(27,114,223,.2)}
.news-body{padding:22px;display:flex;flex-direction:column;gap:10px;height:100%}
.news-cat{
  display:inline-block;font-size:11px;color:var(--c-primary);background:var(--c-bg-tint);
  padding:3px 10px;border-radius:999px;font-weight:600;align-self:flex-start;
}
.news-card h4{font-size:16px;line-height:1.5;margin:0;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden}
.news-date{font-size:12px;color:var(--c-text-3);margin-top:auto}
@media (max-width:768px){
  .news-grid{grid-template-columns:repeat(2,1fr)}
}
@media (max-width:480px){
  .news-grid{grid-template-columns:1fr}
}

/* ============ 底部 CTA ============ */
.cta{
  padding:64px 0;background:#0a1633;color:#fff;position:relative;overflow:hidden;
}
.cta::before{
  content:"";position:absolute;top:0;right:0;bottom:0;left:0;opacity:.4;
  background:radial-gradient(circle at 20% 50%,rgba(27,114,223,.6) 0%,transparent 50%),
             radial-gradient(circle at 80% 50%,rgba(14,165,233,.5) 0%,transparent 50%);
}
.cta-inner{display:flex;align-items:center;justify-content:space-between;gap:30px;flex-wrap:wrap;position:relative;z-index:1}
.cta h2{color:#fff;font-size:30px;margin-bottom:6px}
.cta p{color:rgba(255,255,255,.75);font-size:15px}
.cta-actions{display:flex;gap:14px;flex-wrap:wrap}
@media (max-width:768px){.cta-inner{text-align:center;justify-content:center}}

/* ============ Footer ============ */
.footer{background:#0a1633;color:#cdd5e3;padding:64px 0 24px;border-top:1px solid rgba(255,255,255,.06)}
.footer-grid{display:grid;grid-template-columns:1.6fr 1fr 1fr 1fr 150px;gap:40px}
.foot-brand p{font-size:14px;margin:18px 0;line-height:1.7;color:rgba(255,255,255,.6)}
.foot-brand .logo{color:#fff}
.foot-brand .logo-text strong{color:#fff}
.foot-brand .logo-text em{color:rgba(255,255,255,.4)}
.foot-contact p{font-size:14px;color:rgba(255,255,255,.7);margin-bottom:8px}
.foot-col h5{color:#fff;font-size:15px;margin-bottom:18px;font-weight:600}
.foot-col a{display:block;font-size:14px;color:rgba(255,255,255,.6);margin-bottom:10px;transition:color .2s}
.foot-col a:hover{color:#fff}
/* 页脚右侧：公司微信二维码 */
.foot-qr h5{color:#fff;font-size:15px;margin-bottom:18px;font-weight:600}
.foot-qr-img{
  width:150px;padding:10px;background:#fff;border-radius:14px;
  box-shadow:0 6px 20px rgba(0,0,0,.18);
}
.foot-qr-img img{width:100%;display:block;border-radius:8px}
.foot-qr p{font-size:12px;line-height:1.6;color:rgba(255,255,255,.55);margin-top:12px;max-width:150px}
.foot-bottom{
  display:flex;justify-content:space-between;align-items:center;padding-top:32px;margin-top:48px;
  border-top:1px solid rgba(255,255,255,.08);font-size:13px;color:rgba(255,255,255,.4);
}
.foot-bottom a{color:inherit}
@media (max-width:1100px){
  .footer-grid{grid-template-columns:1.5fr 1fr 1fr 1fr 140px;gap:28px}
}
@media (max-width:768px){
  .footer-grid{grid-template-columns:1fr 1fr;gap:32px}
  .foot-brand{grid-column:span 2}
  .foot-bottom{flex-direction:column;gap:8px;text-align:center}
}

/* ============ 响应式：导航 ============ */
@media (max-width:960px){
  .menu{
    position:fixed;top:var(--header-h-safe);left:0;right:0;background:#fff;
    flex-direction:column;gap:0;padding:8px 20px 20px;
    border-bottom:1px solid var(--c-line);
    /* 关闭时整体推到视口顶部之外：上移「安全区+头部高度+自身高度」，底边正好落在 y=0，彻底不露白条 */
    transform:translateY(calc(-1 * var(--header-h-safe) - 100%));
    transition:transform .3s var(--ease);
    box-shadow:var(--shadow-md);max-height:calc(100vh - var(--header-h-safe));overflow-y:auto;
  }
  .menu.open{transform:translateY(0)}
  .menu a{padding:16px 0;border-bottom:1px solid var(--c-line);font-size:16px}
  .menu a:last-child{border-bottom:0}
  .menu a::after{display:none}
  .nav-cta{display:none}
  .burger{display:flex}
  /* 汉堡 → X 动画 */
  .burger.is-open span:nth-child(1){transform:translateY(7px) rotate(45deg)}
  .burger.is-open span:nth-child(2){opacity:0;transform:scaleX(0)}
  .burger.is-open span:nth-child(3){transform:translateY(-7px) rotate(-45deg)}
  .burger span{transition:transform .25s var(--ease),opacity .2s}
  body.nav-locked{overflow:hidden}
}

/* ============ 移动端专项优化 ============ */
@media (max-width:768px){
  .container{padding:0 18px}
  .section{padding:56px 0}
  .sec-head{margin-bottom:36px}
  .sec-head h2{font-size:26px}
  .sec-head p{font-size:15px}
  .sec-head.row{flex-direction:column;align-items:flex-start;gap:12px}

  /* Hero：收紧留白、缩小装饰 */
  .hero{padding:calc(var(--header-h-safe) + 40px) 0 56px}
  .hero-text .lead{font-size:15px;margin:16px 0 24px}
  .hero-actions{flex-direction:column;align-items:stretch;gap:12px}
  .hero-actions .btn{justify-content:center;min-height:48px}
  .hero-trust{gap:0;margin-top:32px;padding-top:20px;justify-content:space-between}
  .hero-trust li{flex:1;text-align:center;position:relative;font-size:12px}
  .hero-trust li+li::before{
    content:"";position:absolute;left:0;top:15%;height:70%;width:1px;background:var(--c-line);
  }
  .hero-trust span{font-size:22px}
  .hero-visual{max-width:300px;margin-bottom:8px}
  .hero-svg{filter:none}
  .scroll-cue{display:none}
  /* 移动端关闭大面积模糊动画，省 GPU、防卡顿 */
  .blob{display:none}
  .grid-overlay{background-size:32px 32px}

  /* 客户 logo 墙 */
  .clients{padding:28px 0}
  .logo-row{gap:12px 28px}
  .logo-row span{font-size:15px}

  /* 数据条 */
  .stats{padding:44px 0}
  .stats-grid{grid-template-columns:repeat(2,1fr);gap:24px 8px}
  .stat{padding:8px 4px}
  .stat:nth-child(odd)::before{display:none}
  .stat .num{font-size:34px}
  .stat .lbl{font-size:15px;margin-top:8px}
  .stat .desc{font-size:12px}

  /* 业务双卡 */
  .biz-card{padding:28px 22px}
  .biz-icon{width:56px;height:56px;border-radius:14px;margin-bottom:18px}
  .biz-icon svg{width:32px;height:32px}
  .biz-card h3{font-size:21px}
  .biz-list{gap:6px;margin-bottom:22px}

  /* 技术网格 */
  .tech-item{padding:24px 20px}
  .tech-num{font-size:30px}

  /* 关于 banner */
  .about-banner{padding:64px 0}
  .about-text p{font-size:15px}
  .about-points li{font-size:14px;align-items:flex-start;text-align:left}
  .about-stats{gap:12px}
  .ast{padding:20px 12px}
  .ast b{font-size:28px}

  /* CTA */
  .cta{padding:48px 0}
  .cta h2{font-size:24px}
  .cta-actions{flex-direction:column;width:100%}
  .cta-actions .btn{justify-content:center;min-height:48px}

  /* Footer */
  .footer{padding:48px 0 20px}
  .foot-bottom{margin-top:32px;padding-top:24px;gap:6px}
}

/* ============ 窄屏（≤640px）：卡片转单列 ============ */
@media (max-width:640px){
  .prod-grid{grid-template-columns:1fr}
  .sol-grid{grid-template-columns:1fr}
  .prod-card,.sol-card{padding:0}
  .prod-card h4{font-size:16px}
  .prod-card p{font-size:12px}
  .sol-card h4{font-size:16px}
  .sol-card p{font-size:12px}

  .sl-card{grid-template-columns:1fr;gap:18px;padding:24px}
  .sl-visual{height:90px}
  .sl-body h3{font-size:18px}

  /* 子页面：表单 / 产品卡 */
  .form-row{grid-template-columns:1fr}
  form{padding:24px 20px}
  .pl-grid{grid-template-columns:1fr}
  .pl-card{padding:0}
  .ad-grid{grid-template-columns:1fr;gap:36px}
  .c-grid{grid-template-columns:1fr;gap:32px}
}

/* ============ 超窄屏（≤380px） ============ */
@media (max-width:380px){
  .container{padding:0 14px}
  h1{font-size:28px}
  .sec-head h2{font-size:23px}
  .hero-trust span{font-size:19px}
  .stat .num{font-size:30px}
  .footer-grid{grid-template-columns:1fr;gap:28px}
  .foot-brand{grid-column:span 1}
}

/* ============ 触摸设备：hover 态降级 ============ */
@media (hover:none){
  .prod-card:hover,.sol-card:hover,.tech-item:hover,.biz-card:hover,
  .news-card:hover,.sl-card:hover,.pl-card:hover{transform:none}
  .biz-card::before,.prod-card::after{transform:scaleX(0)}
  .sol-card::before{opacity:0}
}

/* ============ 无障碍：减少动态效果 ============ */
@media (prefers-reduced-motion:reduce){
  *,*::before,*::after{animation-duration:.01ms !important;animation-iteration-count:1 !important;transition-duration:.01ms !important}
  html{scroll-behavior:auto}
  .reveal{opacity:1;transform:none}
}

/* ============ 老内核兜底：不支持 aspect-ratio 的等比封面 ============
   aspect-ratio 需要 Chrome/Edge 88+、Safari 15+。部分国产浏览器（QQ、360 等）
   仍在内核较旧的版本上，会让封面高度塌陷、同排卡片参差不齐（「布局错乱」）。
   这里用传统 padding-top 百分比方案兜底：只在「不支持 aspect-ratio」时生效，
   支持的地方完全不受影响。
     16/10 → padding-top:62.5%  */
@supports not (aspect-ratio:1/1){
  .biz-prod-cover,.prod-cover,.sol-cover{display:block;height:0;padding-top:62.5%}
  .biz-prod-cover img,.prod-cover img,.sol-cover img{
    position:absolute;top:0;left:0;width:100%;height:100%;
  }
  .biz-prod-cover svg,.prod-cover svg,.sol-cover svg{
    position:absolute;top:50%;left:50%;transform:translate(-50%,-50%);
  }
}