/* ============================================================
   中山稳正安防工程有限公司 — 站点样式
   设计方向：工程图纸 + 监控画面
   细线网格建立结构，首屏用「监控画面框」承载内容
   ============================================================ */

/* ---------- 设计变量 ---------- */
:root{
  --ink-900:#061523;
  --ink-800:#0a1e33;
  --ink-700:#10304f;
  --ink:#0f2337;
  --ink-2:#43566b;
  --muted:#77879a;

  --paper:#ffffff;
  --paper-2:#f4f6f9;

  --blue:#0f6ccf;
  --blue-d:#0a4f9c;
  --blue-l:#5aa2ea;
  --blue-t:#eaf2fd;

  --gold:#c39a45;
  --gold-t:#f6edd8;

  --line:#e2e8f0;
  --line-2:#eef2f7;
  --line-d:rgba(255,255,255,.14);
  --line-d2:rgba(255,255,255,.08);

  --sans:"PingFang SC","HarmonyOS Sans SC","Microsoft YaHei","Hiragino Sans GB",system-ui,-apple-system,"Segoe UI",Arial,sans-serif;
  --mono:ui-monospace,"SF Mono",Consolas,"Liberation Mono",Menlo,monospace;

  --container:1200px;
  --pad:92px;
  --radius:2px;
  --ease:cubic-bezier(.22,.61,.36,1);
}

/* ---------- 基础重置 ---------- */
*,*::before,*::after{box-sizing:border-box;}
html{-webkit-text-size-adjust:100%;}
body{
  margin:0;
  background:var(--paper);
  color:var(--ink-2);
  font-family:var(--sans);
  font-size:15.5px;
  line-height:1.85;
  -webkit-font-smoothing:antialiased;
  overflow-x:hidden;
}
h1,h2,h3,h4{margin:0;color:var(--ink);font-weight:800;letter-spacing:-.01em;}
p{margin:0;}
ul,ol{margin:0;padding:0;list-style:none;}
img{display:block;max-width:100%;}
a{color:inherit;text-decoration:none;}
button{font:inherit;color:inherit;background:none;border:0;cursor:pointer;}
:focus-visible{outline:2px solid var(--blue);outline-offset:3px;}

/* ---------- 布局工具 ---------- */
.container{width:100%;max-width:var(--container);margin:0 auto;padding:0 28px;}
.section{padding:var(--pad) 0;}

/* 区块标题：细线 + 左右分栏 */
.sec-head{
  display:grid;
  grid-template-columns:minmax(0,1fr) minmax(0,1fr);
  gap:16px 56px;
  align-items:end;
  padding-top:22px;
  border-top:1px solid var(--line);
  margin-bottom:52px;
}
.sec-head h2{font-size:clamp(23px,2.9vw,32px);line-height:1.3;}
.sec-head p{color:var(--muted);font-size:14.5px;line-height:1.8;max-width:52ch;}
.sec-head-dark{border-top-color:var(--line-d);}
.sec-head-dark h2{color:#fff;}
.sec-head-dark p{color:rgba(255,255,255,.62);}

/* ---------- 按钮 ---------- */
.btn{
  display:inline-flex;align-items:center;justify-content:center;
  gap:8px;
  min-height:48px;
  padding:13px 26px;
  font-size:14.5px;font-weight:700;letter-spacing:.01em;
  border-radius:var(--radius);
  border:1px solid transparent;
  transition:background .22s var(--ease),color .22s var(--ease),border-color .22s var(--ease),transform .22s var(--ease);
}
.btn-solid{background:var(--blue);color:#fff;border-color:var(--blue);}
.btn-solid:hover{background:var(--blue-d);border-color:var(--blue-d);transform:translateY(-1px);}
.btn-line{color:#fff;border-color:rgba(255,255,255,.3);}
.btn-line:hover{background:rgba(255,255,255,.09);border-color:rgba(255,255,255,.55);}

/* ============================================================
   顶部信息条
   ============================================================ */
.topbar{background:var(--ink-900);color:rgba(255,255,255,.66);font-size:12.5px;}
.topbar-inner{display:flex;justify-content:space-between;align-items:center;gap:20px;height:38px;}
.topbar-right{font-variant-numeric:tabular-nums;}
.topbar a{color:#fff;font-weight:600;border-bottom:1px solid rgba(255,255,255,.35);}
.topbar a:hover{border-bottom-color:#fff;}

/* ============================================================
   导航栏
   ============================================================ */
.site-header{
  position:sticky;top:0;z-index:60;
  background:rgba(255,255,255,.94);
  backdrop-filter:saturate(150%) blur(8px);
  border-bottom:1px solid var(--line);
  transition:box-shadow .25s var(--ease);
}
.site-header.scrolled{box-shadow:0 8px 26px rgba(15,35,55,.08);}
.nav-wrap{display:flex;align-items:center;justify-content:space-between;gap:24px;height:72px;}

.brand{display:flex;align-items:center;gap:11px;min-height:44px;flex-shrink:0;}
.brand-mark{width:40px;height:40px;object-fit:contain;border-radius:2px;}
.brand-text{display:flex;flex-direction:column;line-height:1.2;}
.brand-text strong{font-size:18px;font-weight:800;color:var(--ink);letter-spacing:.02em;}
.brand-text small{font-size:9.5px;color:var(--muted);letter-spacing:.14em;font-family:var(--mono);}

.main-nav{display:flex;align-items:center;gap:4px;}
.main-nav > a{
  position:relative;
  display:inline-flex;align-items:center;
  min-height:44px;
  padding:9px 12px;
  font-size:14.5px;font-weight:600;color:var(--ink);
  transition:color .2s var(--ease);
}
.main-nav > a:not(.nav-cta)::after{
  content:"";position:absolute;left:12px;right:12px;bottom:8px;height:1px;
  background:var(--blue);transform:scaleX(0);transform-origin:left;
  transition:transform .28s var(--ease);
}
.main-nav > a:not(.nav-cta):hover{color:var(--blue);}
.main-nav > a:not(.nav-cta):hover::after{transform:scaleX(1);}
.nav-cta{
  margin-left:10px;
  padding:10px 18px !important;
  background:var(--ink);color:#fff !important;
  border-radius:var(--radius);
  transition:background .22s var(--ease);
}
.nav-cta:hover{background:var(--blue);}

.nav-toggle{display:none;width:44px;height:44px;flex-direction:column;justify-content:center;gap:5px;padding:0 11px;}
.nav-toggle span{display:block;height:2px;background:var(--ink);transition:transform .25s var(--ease),opacity .25s var(--ease);}
.nav-toggle.open span:nth-child(1){transform:translateY(7px) rotate(45deg);}
.nav-toggle.open span:nth-child(2){opacity:0;}
.nav-toggle.open span:nth-child(3){transform:translateY(-7px) rotate(-45deg);}

/* ============================================================
   首屏
   ============================================================ */
.hero{
  position:relative;
  background:var(--ink-800);
  color:#fff;
  overflow:hidden;
  padding:76px 0 88px;
}
.hero::before{
  content:"";position:absolute;inset:0;pointer-events:none;
  background-image:
    linear-gradient(to right,rgba(255,255,255,.045) 1px,transparent 1px),
    linear-gradient(to bottom,rgba(255,255,255,.045) 1px,transparent 1px);
  background-size:88px 88px;
}
.hero::after{
  content:"";position:absolute;inset:0;pointer-events:none;
  background:radial-gradient(820px 400px at 80% 14%,rgba(15,108,207,.3),transparent 68%);
}
.hero-grid{
  position:relative;z-index:1;
  display:grid;
  grid-template-columns:minmax(0,1.02fr) minmax(0,1fr);
  gap:56px;
  align-items:center;
}

.hero-copy h1{
  color:#fff;
  font-size:clamp(28px,4.3vw,49px);
  line-height:1.17;
  letter-spacing:-.02em;
  margin-bottom:22px;
}
.hero-copy h1 em{font-style:normal;color:var(--blue-l);}
.hero-sub{
  color:rgba(255,255,255,.68);
  font-size:15.5px;
  line-height:1.9;
  max-width:44ch;
  margin-bottom:32px;
}
.hero-actions{display:flex;flex-wrap:wrap;gap:12px;margin-bottom:44px;}

.hero-facts{
  display:grid;
  grid-template-columns:repeat(4,1fr);
  gap:1px;
  border-top:1px solid var(--line-d);
  padding-top:22px;
}
.hero-facts li{display:flex;flex-direction:column;gap:2px;padding-right:14px;border-right:1px solid var(--line-d2);}
.hero-facts li:last-child{border-right:0;}
.hero-facts strong{font-size:19px;font-weight:800;color:#fff;letter-spacing:-.01em;}
.hero-facts span{font-size:12.5px;color:rgba(255,255,255,.55);}

/* 监控画面框 */
.hero-screen{position:relative;}
.screen-frame{
  position:relative;
  background:#05121e;
  border:1px solid rgba(255,255,255,.18);
}
.screen-bar{
  display:flex;align-items:center;gap:10px;
  padding:10px 14px;
  border-bottom:1px solid var(--line-d);
  font-size:12px;color:rgba(255,255,255,.7);
  letter-spacing:.05em;
}
.screen-mark{width:8px;height:8px;background:var(--blue-l);flex-shrink:0;}
.screen-label{flex:1;overflow:hidden;white-space:nowrap;text-overflow:ellipsis;}
.screen-index{font-family:var(--mono);font-size:11.5px;letter-spacing:.1em;color:rgba(255,255,255,.5);font-variant-numeric:tabular-nums;}
.screen-index b{color:#fff;font-weight:600;}

.hero-slider{position:relative;aspect-ratio:1672/941;overflow:hidden;}
.hero-slide{position:absolute;inset:0;opacity:0;transition:opacity .75s var(--ease);}
.hero-slide.active{opacity:1;}
.hero-slide img{width:100%;height:100%;object-fit:cover;}

.corner{position:absolute;z-index:3;width:19px;height:19px;border:2px solid rgba(140,200,255,.9);pointer-events:none;}
.corner.tl{top:11px;left:11px;border-right:0;border-bottom:0;}
.corner.tr{top:11px;right:11px;border-left:0;border-bottom:0;}
.corner.bl{bottom:11px;left:11px;border-right:0;border-top:0;}
.corner.br{bottom:11px;right:11px;border-left:0;border-top:0;}

.hero-arrow{
  position:absolute;top:calc(50% + 20px);z-index:4;
  transform:translateY(-50%);
  width:44px;height:44px;
  display:flex;align-items:center;justify-content:center;
  background:rgba(5,18,30,.55);
  border:1px solid rgba(255,255,255,.24);
  color:#fff;
  opacity:0;
  transition:opacity .25s var(--ease),background .25s var(--ease);
}
.hero-arrow svg{width:19px;height:19px;}
.hero-prev{left:14px;}
.hero-next{right:14px;}
.hero-screen:hover .hero-arrow{opacity:1;}
.hero-arrow:hover{background:var(--blue);border-color:var(--blue);}

.screen-foot{display:flex;align-items:center;gap:20px;padding:8px 2px 0;}
.screen-caption{
  flex:1;
  font-size:13.5px;color:rgba(255,255,255,.8);
  overflow:hidden;white-space:nowrap;text-overflow:ellipsis;
}
/* 分段切换：视觉是细线，命中区 44px 高 */
.screen-progress{display:flex;gap:0;flex-shrink:0;}
.seg{position:relative;width:44px;height:44px;padding:0;background:none;flex:0 0 auto;}
.seg::before{
  content:"";position:absolute;left:10px;right:10px;top:50%;margin-top:-1.5px;height:3px;
  background:rgba(255,255,255,.22);
  transition:background .25s var(--ease),transform .25s var(--ease);
}
.seg.active::before{background:var(--blue-l);transform:scaleY(1.8);}

/* ============================================================
   服务特色
   ============================================================ */
.services{background:var(--paper);}
.svc-grid{
  display:grid;
  grid-template-columns:repeat(4,minmax(0,1fr));
  gap:1px;
  background:var(--line);
  border:1px solid var(--line);
}
.svc{
  background:var(--paper);
  padding:34px 26px 30px;
  transition:background .25s var(--ease);
}
.svc:hover{background:var(--paper-2);}
.svc-icon{
  width:44px;height:44px;
  display:flex;align-items:center;justify-content:center;
  color:var(--blue);
  border:1px solid var(--line);
  margin-bottom:20px;
}
.svc-icon svg{width:23px;height:23px;}
.svc h3{font-size:17px;margin-bottom:9px;}
.svc p{font-size:14px;line-height:1.8;color:var(--muted);}

/* ============================================================
   解决方案
   ============================================================ */
.solutions{background:var(--paper-2);}
.sol-grid{
  display:grid;
  grid-template-columns:repeat(2,minmax(0,1fr));
  gap:1px;
  background:var(--line);
  border:1px solid var(--line);
}
.sol{
  position:relative;
  overflow:hidden;
  background:var(--ink-800);
  aspect-ratio:16/10;
}
.sol img{
  width:100%;height:100%;object-fit:cover;
  transition:transform .8s var(--ease);
}
.sol-img-right{object-position:100% 50%;}
.sol:hover img{transform:scale(1.045);}
.sol-body{
  position:absolute;left:0;right:0;bottom:0;
  padding:26px 26px 24px;
  background:linear-gradient(to top,rgba(6,21,35,.93) 12%,rgba(6,21,35,.72) 52%,rgba(6,21,35,0) 100%);
  color:#fff;
}
.sol-tag{
  display:inline-block;
  font-family:var(--mono);
  font-size:10.5px;letter-spacing:.14em;
  color:var(--blue-l);
  border:1px solid rgba(90,162,234,.45);
  padding:2px 7px;
  margin-bottom:11px;
}
.sol-body h3{color:#fff;font-size:19px;margin-bottom:7px;}
.sol-body p{font-size:14px;color:rgba(255,255,255,.72);line-height:1.7;}

/* ============================================================
   产品中心
   ============================================================ */
.products{background:var(--paper);}
.prod-grid{
  display:grid;
  grid-template-columns:repeat(4,minmax(0,1fr));
  gap:1px;
  background:var(--line);
  border:1px solid var(--line);
}
.prod{
  position:relative;
  display:flex;flex-direction:column;
  background:var(--paper);
  padding:16px 16px 18px;
  transition:background .25s var(--ease);
}
.prod:hover{background:var(--paper-2);}
.prod-pic{
  position:relative;
  aspect-ratio:1/1;
  background:#fff;
  border:1px solid var(--line-2);
  overflow:hidden;
  margin-bottom:13px;
}
.prod-pic img{width:100%;height:100%;object-fit:cover;}
.prod h3{
  font-size:14px;font-weight:700;line-height:1.55;color:var(--ink);
  letter-spacing:0;
}
.prod-flag{
  position:absolute;top:16px;left:16px;z-index:2;
  font-size:11px;font-weight:700;letter-spacing:.04em;
  color:#8a6a1e;
  background:var(--gold-t);
  border:1px solid rgba(195,154,69,.4);
  padding:2px 7px;
}

/* 产品网格尾行的「更多型号」横条，占满该行剩余列 */
.prod-more{
  grid-column:span 3;
  flex-direction:row;
  align-items:center;
  justify-content:space-between;
  gap:32px;
  padding:34px 40px;
  background:var(--ink-800);
  color:#fff;
  transition:background .25s var(--ease);
}
.prod-more:hover{background:var(--ink-700);}
.prod-more-in{display:flex;flex-direction:column;gap:9px;}
.prod-more-in strong{font-size:19px;color:#fff;line-height:1.45;}
.prod-more-in em{font-style:normal;font-size:14px;color:rgba(255,255,255,.6);line-height:1.7;}
.prod-more-tel{
  font-family:var(--mono);
  font-size:24px;font-weight:700;color:var(--blue-l);
  letter-spacing:.01em;white-space:nowrap;
}

/* ============================================================
   五大优势（深色技术带）
   ============================================================ */
.adv{
  position:relative;
  background:var(--ink-800);
  color:#fff;
  overflow:hidden;
}
.adv::before{
  content:"";position:absolute;inset:0;pointer-events:none;
  background-image:
    linear-gradient(to right,rgba(255,255,255,.04) 1px,transparent 1px),
    linear-gradient(to bottom,rgba(255,255,255,.04) 1px,transparent 1px);
  background-size:88px 88px;
}
.adv .container{position:relative;z-index:1;}
.adv-list{
  display:grid;
  grid-template-columns:repeat(5,minmax(0,1fr));
  gap:0;
  border-top:1px solid var(--line-d);
}
.adv-list li{padding:28px 22px 4px;border-left:1px solid var(--line-d2);}
.adv-list li:first-child{border-left:0;padding-left:0;}
.adv-list h3{color:#fff;font-size:16px;margin-bottom:10px;line-height:1.5;}
.adv-list p{font-size:14px;line-height:1.8;color:rgba(255,255,255,.6);}

/* ============================================================
   服务流程（时间轴）
   ============================================================ */
.process{background:var(--paper-2);}
.steps{position:relative;display:grid;grid-template-columns:repeat(4,minmax(0,1fr));}
.steps::before{
  content:"";position:absolute;left:0;right:0;top:17px;height:1px;background:var(--line);
}
.step{
  display:grid;
  grid-template-columns:34px minmax(0,1fr);
  grid-template-rows:auto auto;
  column-gap:14px;
  row-gap:8px;
  padding-right:26px;
  border-right:1px solid var(--line);
}
.step:last-child{border-right:0;padding-right:0;}
.step-node{
  grid-column:1;grid-row:1;
  position:relative;z-index:1;
  width:34px;height:34px;
  display:inline-flex;align-items:center;justify-content:center;
  background:var(--paper-2);
  border:1px solid var(--blue);
  color:var(--blue);
  font-family:var(--mono);
  font-size:12px;font-weight:600;letter-spacing:.03em;
}
.step h3{grid-column:2;grid-row:1;align-self:center;font-size:16.5px;line-height:1.4;margin:0;}
.step p{grid-column:2;grid-row:2;font-size:14px;line-height:1.8;color:var(--muted);}

/* ============================================================
   关于我们
   ============================================================ */
.about{background:var(--paper);}
.about-grid{
  display:grid;
  grid-template-columns:minmax(0,1.15fr) minmax(0,.85fr);
  gap:64px;
  align-items:start;
}
.about-copy h2{font-size:clamp(23px,2.9vw,32px);line-height:1.3;margin-bottom:22px;}
.about-copy p{font-size:14.8px;line-height:1.95;color:var(--ink-2);margin-bottom:16px;max-width:60ch;}
.about-points{
  display:grid;
  grid-template-columns:repeat(2,minmax(0,1fr));
  gap:11px 24px;
  margin-top:26px;
  padding-top:22px;
  border-top:1px solid var(--line);
}
.about-points li{position:relative;padding-left:20px;font-size:14px;font-weight:600;color:var(--ink);}
.about-points li::before{content:"";position:absolute;left:0;top:.72em;width:9px;height:2px;background:var(--blue);}

.about-side{display:flex;flex-direction:column;gap:1px;background:var(--line);border:1px solid var(--line);}
.spec-panel{display:flex;flex-direction:column;gap:1px;background:var(--line);}
.spec-row{display:flex;align-items:baseline;gap:16px;background:var(--paper);padding:18px 22px;}
.spec-row strong{
  font-family:var(--mono);
  font-size:27px;font-weight:700;color:var(--ink);
  line-height:1;letter-spacing:-.02em;min-width:52px;
}
.spec-row span{font-size:14px;color:var(--muted);}
.phone-panel{background:var(--ink-800);color:#fff;padding:24px 22px 26px;}
.phone-panel > span{display:block;font-size:12.5px;color:rgba(255,255,255,.55);margin-bottom:8px;letter-spacing:.04em;}
.phone-panel a{
  display:block;
  font-family:var(--mono);
  font-size:25px;font-weight:700;color:#fff;
  letter-spacing:.01em;margin-bottom:8px;
  transition:color .2s var(--ease);
}
.phone-panel a:hover{color:var(--blue-l);}
.phone-panel p{font-size:13px;color:rgba(255,255,255,.6);line-height:1.7;}

/* ============================================================
   新闻中心（编辑式列表）
   ============================================================ */
.news{background:var(--paper-2);}
.news-list{border-top:1px solid var(--line);}
.news-item{
  display:grid;
  grid-template-columns:96px minmax(0,.95fr) minmax(0,1.35fr);
  gap:28px;
  align-items:center;
  padding:26px 0;
  border-bottom:1px solid var(--line);
}
.news-item img{width:96px;height:96px;object-fit:cover;}
.news-item h3{font-size:16.5px;line-height:1.5;transition:color .2s var(--ease);}
.news-item:hover h3{color:var(--blue);}
.news-item p{font-size:14px;line-height:1.8;color:var(--muted);}

/* ============================================================
   联系 CTA
   ============================================================ */
.cta{
  position:relative;
  background:var(--ink-800);
  color:#fff;
  overflow:hidden;
}
.cta::before{
  content:"";position:absolute;inset:0;pointer-events:none;
  background-image:
    linear-gradient(to right,rgba(255,255,255,.04) 1px,transparent 1px),
    linear-gradient(to bottom,rgba(255,255,255,.04) 1px,transparent 1px);
  background-size:88px 88px;
}
.cta-grid{
  position:relative;z-index:1;
  display:grid;
  grid-template-columns:minmax(0,1fr) auto;
  gap:56px;
  align-items:center;
}
.cta-copy h2{color:#fff;font-size:clamp(23px,2.9vw,32px);line-height:1.3;margin-bottom:14px;}
.cta-copy p{color:rgba(255,255,255,.65);font-size:14.8px;margin-bottom:28px;max-width:46ch;}
.cta-qr{
  display:flex;align-items:center;gap:20px;
  padding:18px 22px;
  border:1px solid var(--line-d);
  background:rgba(255,255,255,.03);
}
.cta-qr img{width:112px;height:auto;background:#fff;padding:5px;}
.cta-qr-text{display:flex;flex-direction:column;gap:6px;}
.cta-qr-text strong{font-size:16px;color:#fff;}
.cta-qr-text span{font-size:13px;color:rgba(255,255,255,.6);max-width:15ch;line-height:1.6;}

/* ============================================================
   页脚
   ============================================================ */
.site-footer{background:var(--ink-900);color:rgba(255,255,255,.6);}
.footer-grid{
  display:grid;
  grid-template-columns:minmax(0,1.5fr) repeat(3,minmax(0,1fr));
  gap:40px;
  padding:64px 28px 48px;
}
.footer-brand img{width:46px;height:46px;object-fit:contain;margin-bottom:16px;}
.footer-brand p{font-size:13.5px;line-height:1.9;max-width:38ch;}
.footer-col{display:flex;flex-direction:column;}
.footer-col h4{color:#fff;font-size:14px;font-weight:700;margin-bottom:6px;letter-spacing:.02em;}
.footer-col a{display:inline-flex;align-items:center;min-height:44px;font-size:13.5px;transition:color .2s var(--ease);}
.footer-col a:hover{color:var(--blue-l);}
.footer-col p{font-size:13.5px;line-height:1.75;margin-bottom:10px;}
.footer-bottom{
  display:flex;justify-content:space-between;align-items:center;gap:16px;flex-wrap:wrap;
  padding:14px 28px 20px;
  border-top:1px solid var(--line-d2);
  font-size:13px;
}
.footer-icp{
  display:inline-flex;align-items:center;min-height:44px;
  color:rgba(255,255,255,.6);
  border-bottom:1px solid rgba(255,255,255,.22);
  transition:color .2s var(--ease),border-color .2s var(--ease);
}
.footer-icp:hover{color:#fff;border-bottom-color:#fff;}

/* ============================================================
   移动端拨号浮钮
   ============================================================ */
.float-call{
  position:fixed;right:18px;bottom:18px;z-index:70;
  width:52px;height:52px;
  display:none;align-items:center;justify-content:center;
  background:var(--blue);color:#fff;
  border-radius:50%;
  box-shadow:0 8px 22px rgba(15,108,207,.42);
}

/* ============================================================
   首屏载入动效（纯 CSS，且不改变可见性——即使动效不执行，内容也始终可读）
   ============================================================ */
@keyframes heroIn{
  from{transform:translateY(14px);}
  to{transform:none;}
}
.hero-copy{animation:heroIn .7s var(--ease) both;}
.hero-screen{animation:heroIn .7s var(--ease) .12s both;}

/* ============================================================
   响应式
   ============================================================ */
@media (max-width:1100px){
  .main-nav > a{padding:9px 9px;font-size:14px;}
  .hero-grid{gap:40px;}
  .adv-list{grid-template-columns:repeat(3,minmax(0,1fr));}
  .adv-list li{padding:24px 20px 4px;}
  .adv-list li:nth-child(3n+1){border-left:0;padding-left:0;}
  .adv-list li:nth-child(n+4){border-top:1px solid var(--line-d2);margin-top:24px;}
}

@media (max-width:980px){
  :root{--pad:68px;}
  .nav-toggle{display:flex;}
  .main-nav{
    position:absolute;top:100%;left:0;right:0;
    flex-direction:column;align-items:stretch;
    gap:0;
    background:#fff;
    border-bottom:1px solid var(--line);
    box-shadow:0 16px 34px rgba(15,35,55,.12);
    max-height:0;
    visibility:hidden;
    overflow:hidden;
    transition:max-height .34s var(--ease),visibility .34s var(--ease);
  }
  .main-nav.open{max-height:520px;visibility:visible;}
  .main-nav > a{padding:15px 28px;border-bottom:1px solid var(--line-2);font-size:15px;min-height:54px;}
  .main-nav > a:not(.nav-cta)::after{display:none;}
  .nav-cta{margin:14px 28px 18px;justify-content:center;padding:13px 18px !important;}

  .hero{padding:56px 0 68px;}
  .hero-grid{grid-template-columns:minmax(0,1fr);gap:44px;}
  .hero-sub{max-width:none;}
  .hero-arrow{opacity:1;}

  .sec-head{grid-template-columns:minmax(0,1fr);gap:12px;align-items:start;}
  .sec-head p{max-width:none;}

  .svc-grid{grid-template-columns:repeat(2,minmax(0,1fr));}
  .prod-grid{grid-template-columns:repeat(3,minmax(0,1fr));}
  .prod-more{grid-column:span 2;}

  .steps{grid-template-columns:repeat(2,minmax(0,1fr));}
  .steps::before{display:none;}
  .step{padding:24px 26px 24px 0;border-top:1px solid var(--line);}
  .step:nth-child(2n){border-right:0;padding-right:0;}
  .step:nth-child(1),.step:nth-child(2){border-top:0;padding-top:0;}

  .about-grid{grid-template-columns:minmax(0,1fr);gap:40px;}
  .cta-grid{grid-template-columns:minmax(0,1fr);gap:36px;}
  .footer-grid{grid-template-columns:repeat(2,minmax(0,1fr));gap:34px;}
}

@media (max-width:720px){
  .topbar{font-size:13px;}
  .topbar-left{display:none;}
  .topbar-inner{justify-content:center;}
  .brand-text small{display:none;}
  .brand-text strong{font-size:16.5px;}

  /* 正文类文字在手机上统一到 14px 以上 */
  .svc p,.sol-body p,.adv-list p,.step p,.spec-row span,.news-item p,.prod h3{font-size:14px;}
  .hero-facts span{font-size:14px;}
  .screen-label{font-size:12.5px;}
  .sol-tag{font-size:12px;}
  .prod-flag{font-size:12px;}
  .screen-caption{font-size:13px;}

  .hero-facts{grid-template-columns:repeat(2,minmax(0,1fr));gap:18px 0;}
  .hero-facts li:nth-child(2n){border-right:0;}

  .svc-grid{grid-template-columns:minmax(0,1fr);}
  .sol-grid{grid-template-columns:minmax(0,1fr);}
  .prod-grid{grid-template-columns:repeat(2,minmax(0,1fr));}
  .prod-more{grid-column:span 1;flex-direction:column;align-items:flex-start;gap:14px;padding:22px 16px;}
  .prod-more-in strong{font-size:16px;line-height:1.5;}
  .prod-more-tel{font-size:19px;}

  .adv-list{grid-template-columns:minmax(0,1fr);}
  .adv-list li{padding:22px 0 4px;border-left:0;border-top:1px solid var(--line-d2);margin-top:0;}
  .adv-list li:first-child{border-top:0;padding-top:24px;}

  .steps{grid-template-columns:minmax(0,1fr);}
  .step{padding:24px 0 0;border-right:0;border-top:1px solid var(--line);}
  .step:first-child{border-top:0;padding-top:0;}

  .news-item{grid-template-columns:72px minmax(0,1fr);gap:16px 18px;align-items:start;padding:22px 0;}
  .news-item img{width:72px;height:72px;grid-row:span 2;}
  .news-item h3{grid-column:2;font-size:15.5px;}
  .news-item p{grid-column:2;}
  .about-points{grid-template-columns:minmax(0,1fr);}
  .footer-grid{grid-template-columns:minmax(0,1fr);gap:26px;}
  .footer-bottom{flex-direction:column;align-items:flex-start;}
  .float-call{display:flex;}
}

@media (max-width:430px){
  :root{--pad:56px;}
  .container{padding:0 18px;}
  .hero-actions{flex-direction:column;align-items:stretch;}
  .hero-actions .btn{width:100%;}
  .prod{padding:12px 12px 14px;}
  .prod-flag{top:12px;left:12px;}
  .prod-more{padding:22px 18px;}
  .cta-qr{flex-direction:column;align-items:flex-start;}
  .screen-caption{font-size:12.5px;}
}

@media (prefers-reduced-motion:reduce){
  *{animation-duration:.001ms !important;transition-duration:.001ms !important;}
  .hero-copy,.hero-screen{transform:none;}
  .hero-slide{transition:none;}
}