/* ============================================================
   安速云服 - 高科技企业网站设计系统
   高端 / 炫酷 / 简约 / 科技感
   ============================================================ */

:root{
  --bg:#05080f;
  --bg-2:#080d1a;
  --bg-3:#0c1424;
  --surface:rgba(255,255,255,.035);
  --surface-2:rgba(255,255,255,.055);
  --border:rgba(255,255,255,.08);
  --border-strong:rgba(120,200,255,.25);
  --text:#eaf2ff;
  --text-dim:#8ea3c4;
  --text-mute:#5d6f8d;
  --cyan:#22d3ee;
  --cyan-bright:#00e5ff;
  --blue:#3b82f6;
  --blue-deep:#0a84ff;
  --violet:#8b5cf6;
  --grad:linear-gradient(120deg,#00e5ff 0%,#3b82f6 55%,#8b5cf6 100%);
  --grad-soft:linear-gradient(120deg,rgba(0,229,255,.18),rgba(59,130,246,.12) 55%,rgba(139,92,246,.18));
  --glow:0 0 30px rgba(0,229,255,.25);
  --glow-strong:0 0 50px rgba(0,229,255,.45);
  --radius:18px;
  --radius-sm:12px;
  --maxw:1400px;
  --ease:cubic-bezier(.22,.61,.36,1);
  --font:"PingFang SC","Microsoft YaHei","HarmonyOS Sans","Segoe UI",system-ui,-apple-system,sans-serif;
}

*{margin:0;padding:0;box-sizing:border-box}
html{scroll-behavior:smooth;-webkit-text-size-adjust:100%}
body{
  font-family:var(--font);
  background:var(--bg);
  color:var(--text);
  line-height:1.7;
  overflow-x:hidden;
  -webkit-font-smoothing:antialiased;
  text-rendering:optimizeLegibility;
}

/* ---------- 全局背景：网格 + 光晕 ---------- */
.bg-fx{position:fixed;inset:0;z-index:-2;overflow:hidden;pointer-events:none}
.bg-fx::before{
  content:"";position:absolute;inset:-2px;
  background:
    radial-gradient(900px 600px at 12% -5%,rgba(0,229,255,.16),transparent 60%),
    radial-gradient(800px 600px at 92% 8%,rgba(139,92,246,.14),transparent 60%),
    radial-gradient(700px 500px at 50% 110%,rgba(59,130,246,.12),transparent 60%),
    var(--bg);
}
.bg-fx::after{
  content:"";position:absolute;inset:0;
  background-image:
    linear-gradient(rgba(120,200,255,.045) 1px,transparent 1px),
    linear-gradient(90deg,rgba(120,200,255,.045) 1px,transparent 1px);
  background-size:54px 54px;
  mask-image:radial-gradient(circle at 50% 40%,#000 0%,transparent 78%);
  -webkit-mask-image:radial-gradient(circle at 50% 40%,#000 0%,transparent 78%);
  animation:gridShift 24s linear infinite;
}
@keyframes gridShift{to{background-position:54px 54px}}

/* 飘浮粒子 */
.particles{position:fixed;inset:0;z-index:-1;pointer-events:none;overflow:hidden}
.particles span{position:absolute;display:block;border-radius:50%;background:var(--cyan);box-shadow:0 0 10px var(--cyan);opacity:.35;animation:floatUp linear infinite}
@keyframes floatUp{0%{transform:translateY(108vh) scale(.6);opacity:0}10%{opacity:.5}90%{opacity:.4}100%{transform:translateY(-10vh) scale(1);opacity:0}}

a{color:inherit;text-decoration:none}
img{max-width:100%;display:block}
button{font-family:inherit;cursor:pointer;border:none;background:none;color:inherit}
ul{list-style:none}

/* ---------- 通用容器 ---------- */
.wrap{max-width:var(--maxw);margin:0 auto;padding:0 clamp(16px,3vw,40px)}
.section{padding:clamp(64px,8vw,120px) 0;position:relative}
.section--tight{padding:clamp(44px,5vw,80px) 0}
.eyebrow{
  display:inline-flex;align-items:center;gap:10px;
  font-size:13px;letter-spacing:.32em;text-transform:uppercase;
  color:var(--cyan-bright);font-weight:600;margin-bottom:18px;
}
.eyebrow::before{content:"";width:30px;height:1px;background:var(--grad)}
.section-title{font-size:clamp(28px,4.2vw,46px);font-weight:800;letter-spacing:-.01em;line-height:1.18}
.section-title em{font-style:normal;background:var(--grad);-webkit-background-clip:text;background-clip:text;color:transparent}
.section-sub{color:var(--text-dim);max-width:680px;margin-top:16px;font-size:16px}
.section-head{margin-bottom:56px}
.section-head.center{text-align:center}
.section-head.center .section-sub{margin-left:auto;margin-right:auto}

/* ---------- 按钮 ---------- */
.btn{
  display:inline-flex;align-items:center;gap:10px;
  padding:15px 32px;border-radius:60px;font-weight:600;font-size:15px;
  position:relative;transition:.35s var(--ease);white-space:nowrap;
}
.btn--primary{background:var(--grad);color:#04121f;box-shadow:var(--glow)}
.btn--primary:hover{transform:translateY(-3px);box-shadow:var(--glow-strong)}
.btn--ghost{border:1px solid var(--border-strong);color:var(--text);background:var(--surface)}
.btn--ghost:hover{background:var(--surface-2);border-color:var(--cyan);transform:translateY(-3px)}
.btn .arr{transition:transform .35s var(--ease)}
.btn:hover .arr{transform:translateX(5px)}

/* ---------- 顶部导航 ---------- */
.nav{
  position:fixed;top:0;left:0;right:0;z-index:100;
  transition:.4s var(--ease);
}
.nav-inner{
  max-width:var(--maxw);margin:0 auto;padding:0 clamp(16px,3vw,40px);
  height:clamp(60px,7vw,76px);display:flex;align-items:center;justify-content:space-between;gap:24px;
}
.nav.scrolled{background:rgba(6,9,18,.78);backdrop-filter:blur(18px);border-bottom:1px solid var(--border)}
.brand{display:flex;align-items:center;gap:12px;font-weight:800;font-size:clamp(16px,2vw,20px);letter-spacing:.02em;flex-shrink:0}
.brand img{height:clamp(26px,3.2vw,34px);width:auto;filter:brightness(0) invert(1)}
.brand small{display:block;font-size:11px;font-weight:500;letter-spacing:.28em;color:var(--cyan-bright);text-transform:uppercase}
.nav-links{display:flex;align-items:center;gap:4px}
.nav-links a{
  position:relative;padding:10px 16px;font-size:15px;color:var(--text-dim);font-weight:500;
  transition:.3s var(--ease);border-radius:10px;
}
.nav-links a:hover{color:var(--text)}
.nav-links a.active{color:var(--text)}
.nav-links a.active::after{
  content:"";position:absolute;left:16px;right:16px;bottom:4px;height:2px;
  background:var(--grad);border-radius:2px;box-shadow:0 0 10px var(--cyan-bright);
}
.nav-cta{display:flex;align-items:center;gap:14px}
.nav-phone{display:flex;align-items:center;gap:8px;font-size:15px;font-weight:700;color:var(--cyan-bright)}
.nav-phone svg{width:18px;height:18px}
.nav-toggle{display:none;flex-direction:column;gap:5px;padding:8px;z-index:101}
.nav-toggle span{width:24px;height:2px;background:var(--text);border-radius:2px;transition:.3s var(--ease)}
.nav-toggle.active span:nth-child(1){transform:translateY(7px) rotate(45deg)}
.nav-toggle.active span:nth-child(2){opacity:0;transform:scaleX(0)}
.nav-toggle.active span:nth-child(3){transform:translateY(-7px) rotate(-45deg)}

/* ---------- HERO ---------- */
.hero{position:relative;padding:clamp(110px,16vw,170px) 0 clamp(60px,8vw,100px);overflow:hidden}
.hero-grid{display:grid;grid-template-columns:1.15fr .85fr;gap:clamp(30px,5vw,60px);align-items:center}
.hero-badge{
  display:inline-flex;align-items:center;gap:10px;padding:8px 18px;border-radius:60px;
  background:var(--surface);border:1px solid var(--border-strong);font-size:13px;color:var(--cyan-bright);
  margin-bottom:26px;
}
.hero-badge .dot{width:8px;height:8px;border-radius:50%;background:var(--cyan-bright);box-shadow:0 0 10px var(--cyan-bright);animation:pulse 1.8s infinite}
@keyframes pulse{0%,100%{opacity:1}50%{opacity:.35}}
.hero h1{
  font-size:clamp(34px,5.4vw,64px);font-weight:800;line-height:1.12;letter-spacing:-.02em;margin-bottom:24px;
}
.hero h1 em{font-style:normal;background:var(--grad);-webkit-background-clip:text;background-clip:text;color:transparent}
.hero p.lead{font-size:clamp(15px,1.6vw,18px);color:var(--text-dim);max-width:560px;margin-bottom:34px}
.hero-tags{display:flex;flex-wrap:wrap;gap:10px;margin-bottom:38px}
.hero-tags span{
  padding:7px 16px;border-radius:40px;font-size:13px;color:var(--text-dim);
  background:var(--surface);border:1px solid var(--border);transition:.3s var(--ease);
}
.hero-tags span:hover{border-color:var(--cyan);color:var(--text);transform:translateY(-2px)}
.hero-actions{display:flex;gap:16px;flex-wrap:wrap}
.hero-stats{display:flex;gap:clamp(20px,4vw,44px);margin-top:clamp(32px,5vw,56px);flex-wrap:wrap}
.hero-stats .num{font-size:clamp(26px,3.4vw,34px);font-weight:800;background:var(--grad);-webkit-background-clip:text;background-clip:text;color:transparent}
.hero-stats .lab{font-size:13px;color:var(--text-mute);margin-top:4px}

/* hero 视觉球体 */
.hero-visual{position:relative;height:clamp(300px,42vw,460px);display:flex;align-items:center;justify-content:center}
.orb{position:absolute;border-radius:50%}
.orb--core{width:clamp(150px,22vw,230px);height:clamp(150px,22vw,230px);background:radial-gradient(circle at 35% 30%,#00e5ff,#0a84ff 55%,#1e1b4b);box-shadow:0 0 80px rgba(0,229,255,.5),inset -20px -30px 60px rgba(0,0,0,.5);animation:spin 18s linear infinite}
.orb--ring{border:1px solid var(--border-strong);animation:spin 26s linear infinite reverse}
.orb--ring.r1{width:clamp(220px,32vw,330px);height:clamp(220px,32vw,330px)}
.orb--ring.r2{width:clamp(280px,40vw,420px);height:clamp(280px,40vw,420px);border-color:rgba(120,200,255,.15)}
.orb--ring.r3{width:clamp(340px,50vw,520px);height:clamp(340px,50vw,520px);border-color:rgba(120,200,255,.08)}
.orb--ring::before{content:"";position:absolute;width:10px;height:10px;border-radius:50%;background:var(--cyan-bright);box-shadow:0 0 16px var(--cyan-bright);top:-5px;left:50%;transform:translateX(-50%)}
@keyframes spin{to{transform:rotate(360deg)}}
.scan{position:absolute;width:clamp(150px,22vw,230px);height:2px;background:linear-gradient(90deg,transparent,var(--cyan-bright),transparent);opacity:.6;animation:scan 3.5s ease-in-out infinite}
@keyframes scan{0%,100%{top:30%;opacity:0}50%{top:70%;opacity:.7}}

/* ---------- 通用卡片 ---------- */
.card{
  position:relative;background:var(--surface);border:1px solid var(--border);
  border-radius:var(--radius);padding:30px;overflow:hidden;
  transition:.4s var(--ease);
}
.card::before{
  content:"";position:absolute;top:0;left:0;right:0;height:2px;
  background:var(--grad);transform:scaleX(0);transform-origin:left;transition:.5s var(--ease);
}
.card:hover{transform:translateY(-6px);background:var(--surface-2);border-color:var(--border-strong);box-shadow:0 20px 50px rgba(0,0,0,.4)}
.card:hover::before{transform:scaleX(1)}

/* 系统卡片 */
.sys-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(300px,1fr));gap:24px}
.sys-card .num{
  font-size:14px;font-weight:700;color:var(--cyan-bright);
  font-family:"SF Mono",monospace;letter-spacing:.1em;margin-bottom:14px;
}
.sys-card .num span{font-size:40px;background:var(--grad);-webkit-background-clip:text;background-clip:text;color:transparent}
.sys-card h3{font-size:22px;font-weight:700;margin-bottom:12px}
.sys-card .desc{color:var(--text-dim);font-size:14px;line-height:1.85;display:-webkit-box;-webkit-line-clamp:4;-webkit-box-orient:vertical;overflow:hidden}
.sys-card .more{display:inline-flex;align-items:center;gap:6px;margin-top:18px;color:var(--cyan-bright);font-size:14px;font-weight:600;transition:.3s var(--ease)}
.sys-card:hover .more{gap:12px}

/* ---------- 优势 ---------- */
.adv-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(280px,1fr));gap:24px}
.adv-card{text-align:left}
.adv-ico{
  width:56px;height:56px;border-radius:14px;display:flex;align-items:center;justify-content:center;
  background:var(--grad-soft);border:1px solid var(--border-strong);margin-bottom:20px;color:var(--cyan-bright);
}
.adv-ico svg{width:26px;height:26px}
.adv-card h3{font-size:20px;font-weight:700;margin-bottom:10px}
.adv-card p{color:var(--text-dim);font-size:15px}

/* ---------- 模块 ---------- */
.mod-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(190px,1fr));gap:20px}
.mod-card{padding:26px 22px;text-align:center}
.mod-ico{width:54px;height:54px;margin:0 auto 16px;border-radius:14px;display:flex;align-items:center;justify-content:center;background:var(--grad-soft);border:1px solid var(--border-strong);color:var(--cyan-bright)}
.mod-ico svg{width:24px;height:24px}
.mod-card h3{font-size:17px;font-weight:700}
.mod-card .tag{display:inline-block;margin-top:8px;font-size:12px;color:var(--text-mute)}

/* ---------- 数据条 ---------- */
.metric{display:grid;grid-template-columns:repeat(auto-fit,minmax(180px,1fr));gap:0;border:1px solid var(--border);border-radius:var(--radius);overflow:hidden;background:var(--surface)}
.metric .cell{padding:40px 30px;text-align:center;position:relative}
.metric .cell+.cell{border-left:1px solid var(--border)}
.metric .num{font-size:clamp(28px,4vw,42px);font-weight:800;background:var(--grad);-webkit-background-clip:text;background-clip:text;color:transparent}
.metric .lab{color:var(--text-dim);font-size:14px;margin-top:6px}

/* ---------- 新闻 ---------- */
.news-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(300px,1fr));gap:24px}
.news-card{display:flex;flex-direction:column}
.news-date{display:flex;align-items:baseline;gap:10px;margin-bottom:14px}
.news-date .d{font-size:34px;font-weight:800;background:var(--grad);-webkit-background-clip:text;background-clip:text;color:transparent;line-height:1}
.news-date .m{font-size:13px;color:var(--text-mute)}
.news-card h3{font-size:18px;font-weight:700;margin-bottom:10px;line-height:1.4;transition:.3s var(--ease)}
.news-card:hover h3{color:var(--cyan-bright)}
.news-card p{color:var(--text-dim);font-size:14px;display:-webkit-box;-webkit-line-clamp:3;-webkit-box-orient:vertical;overflow:hidden;flex:1}

/* ---------- 合作伙伴 ---------- */
.partner-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(200px,1fr));gap:20px}
.partner-card{padding:30px 22px;text-align:center}
.partner-card .nm{font-size:18px;font-weight:700;margin-bottom:8px}
.partner-card .ds{color:var(--text-dim);font-size:13px;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden}

/* ---------- CTA ---------- */
.cta{position:relative;border-radius:24px;padding:64px;text-align:center;overflow:hidden;background:var(--surface);border:1px solid var(--border-strong)}
.cta::before{content:"";position:absolute;inset:0;background:radial-gradient(600px 300px at 50% 0%,rgba(0,229,255,.18),transparent 70%)}
.cta h2{position:relative;font-size:clamp(26px,3.6vw,42px);font-weight:800;margin-bottom:16px}
.cta h2 em{font-style:normal;background:var(--grad);-webkit-background-clip:text;background-clip:text;color:transparent}
.cta p{position:relative;color:var(--text-dim);max-width:560px;margin:0 auto 30px}
.cta .hero-actions{justify-content:center}

/* ---------- 页脚 ---------- */
.footer{border-top:1px solid var(--border);padding:70px 0 30px;position:relative;background:linear-gradient(180deg,transparent,rgba(8,13,26,.6))}
.footer-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(220px,1fr));gap:40px;margin-bottom:50px}
.footer .brand{margin-bottom:18px}
.footer-about{color:var(--text-dim);font-size:14px;max-width:340px;margin-bottom:20px}
.footer h4{font-size:15px;font-weight:700;margin-bottom:20px;color:var(--text)}
.footer-links li{margin-bottom:12px}
.footer-links a{color:var(--text-dim);font-size:14px;transition:.3s var(--ease)}
.footer-links a:hover{color:var(--cyan-bright);padding-left:4px}
.footer-contact li{display:flex;gap:10px;margin-bottom:14px;color:var(--text-dim);font-size:14px}
.footer-contact svg{width:18px;height:18px;flex-shrink:0;color:var(--cyan-bright);margin-top:3px}
.footer-qr{text-align:center;margin-top:8px}
.footer-qr img{width:120px;height:120px;border-radius:12px;margin:0 auto 10px;border:1px solid var(--border)}
.footer-qr p{font-size:12px;color:var(--text-mute)}
.footer-bottom{border-top:1px solid var(--border);padding-top:24px;display:flex;justify-content:space-between;align-items:center;flex-wrap:wrap;gap:12px}
.footer-bottom p{font-size:13px;color:var(--text-mute)}

/* ---------- 页面通用 hero ---------- */
.page-hero{padding:clamp(110px,15vw,160px) 0 clamp(40px,6vw,70px);position:relative;overflow:hidden}
.page-hero::after{
  content:"";position:absolute;left:50%;bottom:-1px;width:60%;height:1px;transform:translateX(-50%);
  background:linear-gradient(90deg,transparent,var(--border-strong),transparent);
}
.page-hero .eyebrow{margin-bottom:14px}
.page-hero h1{font-size:clamp(32px,4.8vw,54px);font-weight:800;letter-spacing:-.02em;line-height:1.15;margin-bottom:18px}
.page-hero h1 em{font-style:normal;background:var(--grad);-webkit-background-clip:text;background-clip:text;color:transparent}
.page-hero p{color:var(--text-dim);max-width:620px;font-size:17px}
.breadcrumb{display:flex;gap:8px;font-size:13px;color:var(--text-mute);margin-top:22px}
.breadcrumb a:hover{color:var(--cyan-bright)}

/* ---------- 系统详情/通用 ---------- */
.feature-list{display:grid;grid-template-columns:repeat(2,1fr);gap:14px;margin-top:20px}
.feature-list li{display:flex;align-items:flex-start;gap:10px;font-size:14px;color:var(--text-dim)}
.feature-list li::before{content:"";width:6px;height:6px;border-radius:50%;background:var(--cyan-bright);margin-top:9px;flex-shrink:0;box-shadow:0 0 8px var(--cyan-bright)}

/* 流程步骤 */
.steps{display:grid;grid-template-columns:repeat(auto-fit,minmax(240px,1fr));gap:24px;position:relative}
.step{padding:34px 26px;text-align:left}
.step .ico{width:60px;height:60px;border-radius:16px;display:flex;align-items:center;justify-content:center;background:var(--grad);color:#04121f;margin-bottom:20px;font-size:24px;font-weight:800}
.step h3{font-size:19px;font-weight:700;margin-bottom:10px}
.step p{color:var(--text-dim);font-size:14px}

/* 时间线（关于） */
.timeline{position:relative;padding-left:30px}
.timeline::before{content:"";position:absolute;left:8px;top:0;bottom:0;width:2px;background:linear-gradient(180deg,var(--cyan),var(--blue),var(--violet),transparent)}
.timeline .node{position:relative;padding-bottom:40px}
.timeline .node::before{content:"";position:absolute;left:-26px;top:4px;width:14px;height:14px;border-radius:50%;background:var(--cyan-bright);box-shadow:0 0 14px var(--cyan-bright)}
.timeline .node .yr{font-size:14px;color:var(--cyan-bright);font-weight:700;margin-bottom:6px}
.timeline .node h3{font-size:18px;font-weight:700;margin-bottom:8px}
.timeline .node p{color:var(--text-dim);font-size:14px}

/* 联系卡片 */
.contact-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(300px,1fr));gap:40px;align-items:start}
.contact-items{display:grid;gap:20px}
.contact-item{display:flex;gap:18px;align-items:flex-start;padding:26px}
.contact-item .ico{width:50px;height:50px;border-radius:12px;display:flex;align-items:center;justify-content:center;background:var(--grad-soft);border:1px solid var(--border-strong);color:var(--cyan-bright);flex-shrink:0}
.contact-item .ico svg{width:22px;height:22px}
.contact-item .lab{font-size:13px;color:var(--text-mute);margin-bottom:4px}
.contact-item .val{font-size:18px;font-weight:700}
.contact-qr{padding:34px;text-align:center}
.contact-qr img{width:180px;height:180px;border-radius:14px;margin:0 auto 16px;border:1px solid var(--border)}
.contact-qr h3{font-size:18px;margin-bottom:8px}
.contact-qr p{font-size:14px;color:var(--text-dim)}

/* ---------- 滚动揭示动画 ---------- */
.reveal{opacity:0;transform:translateY(30px);transition:.8s var(--ease)}
.reveal.in{opacity:1;transform:none}
.reveal.d1{transition-delay:.08s}
.reveal.d2{transition-delay:.16s}
.reveal.d3{transition-delay:.24s}
.reveal.d4{transition-delay:.32s}
.reveal.d5{transition-delay:.4s}

/* ---------- 移动菜单 ---------- */
.mobile-menu{
  position:fixed;inset:0;z-index:99;background:rgba(5,8,15,.96);backdrop-filter:blur(20px);
  display:flex;flex-direction:column;justify-content:center;align-items:center;gap:8px;
  transform:translateY(-100%);transition:.5s var(--ease);
}
.mobile-menu.open{transform:none}
.mobile-menu a{font-size:22px;font-weight:600;padding:14px;color:var(--text-dim)}
.mobile-menu a.active{color:var(--cyan-bright)}

/* ---------- 响应式：超大屏 ---------- */
@media(min-width:1600px){
  :root{--maxw:1520px}
  .hero h1{font-size:72px}
}

/* ---------- 响应式：中屏（平板）≤1024 ---------- */
@media(max-width:1024px){
  .hero-grid{grid-template-columns:1fr}
  .hero-visual{height:clamp(280px,40vw,360px);margin-top:10px}
  .nav-links,.nav-phone{display:none}
  .nav-toggle{display:flex}
  .nav-cta{margin-left:auto;gap:10px}
  .nav-cta .btn{padding:10px 18px;font-size:14px}
  .feature-list{grid-template-columns:1fr}
  .sys-grid,.adv-grid,.news-grid,.partner-grid{grid-template-columns:repeat(auto-fit,minmax(280px,1fr))}
  .mod-grid{grid-template-columns:repeat(auto-fit,minmax(160px,1fr))}
  .footer-grid{grid-template-columns:repeat(auto-fit,minmax(200px,1fr));gap:32px}
}

/* ---------- 响应式：小屏（大手机）≤768 ---------- */
@media(max-width:768px){
  .section{padding:64px 0}
  .section-head{margin-bottom:40px}
  .card{padding:24px}
  .hero{padding-top:120px}
  .hero-tags{gap:8px}
  .hero-tags span{font-size:12px;padding:6px 12px}
  .hero-actions{flex-direction:column;align-items:stretch}
  .hero-actions .btn{justify-content:center;width:100%}
  .cta{padding:40px 24px}
  .cta .hero-actions{flex-direction:row}
  .cta .hero-actions .btn{width:auto}
  .contact-item{padding:20px;gap:14px}
  .contact-item .val{font-size:16px}
  .contact-qr img{width:150px;height:150px}
  .partner-card,.mod-card{padding:22px 16px}
  .news-date .d{font-size:28px}
  .timeline{padding-left:24px}
}

/* ---------- 响应式：手机 ≤640 ---------- */
@media(max-width:640px){
  .wrap{padding:0 16px}
  .sys-grid,.adv-grid,.news-grid,.partner-grid,.mod-grid,.steps{grid-template-columns:1fr}
  .metric{grid-template-columns:1fr 1fr}
  .metric .cell{padding:24px 14px}
  .metric .cell:nth-child(odd){border-left:none}
  .metric .cell:nth-child(n+3){border-top:1px solid var(--border)}
  .cta{padding:32px 20px}
  .footer{padding:48px 0 24px}
  .footer-bottom{flex-direction:column;text-align:center;gap:8px}
  .footer-qr img{width:110px;height:110px}
  .card{padding:20px}
  .step{padding:26px 20px}
  .step .ico{width:50px;height:50px;font-size:20px}
  .mobile-menu a{font-size:20px}
}

/* ---------- 响应式：小手机 ≤380 ---------- */
@media(max-width:380px){
  .hero h1{font-size:30px}
  .section-title{font-size:26px}
  .metric{grid-template-columns:1fr}
  .metric .cell{border-left:none!important;border-top:1px solid var(--border)}
  .metric .cell:first-child{border-top:none}
  .hero-stats{gap:18px}
  .hero-stats .num{font-size:24px}
  .contact-qr img{width:130px;height:130px}
}

/* ---------- 触摸设备优化 ---------- */
@media(hover:none){
  .card:hover{transform:none}
  .btn:hover{transform:none}
  .nav-links a:hover{color:var(--text-dim)}
}