/* ============================================================
   云构数字 · YUNGOU STUDIO —— 软件定制开发官网
   风格：明亮高级商务风（象牙白 + 深靛蓝 + 少量金）
   目标：专业、克制、响应式、纯本地资源
   ============================================================ */

/* ---------- 设计变量 ---------- */
:root{
  --bg:#ffffff;
  --bg-soft:#f5f8fd;          /* 交替浅色区块 */
  --bg-soft2:#eef3fb;
  --navy:#0d1b33;             /* 深色高级区块(页脚/CTA) —— 靛蓝而非纯黑 */
  --navy-2:#152a4d;
  --ink:#0f1e38;             /* 主标题 */
  --body:#41506b;            /* 正文 */
  --muted:#7d8aa3;           /* 次要文字 */
  --line:#e6ecf5;            /* 描边 */
  --line-2:#d7e0ee;
  --brand:#1f52cc;           /* 品牌靛蓝 */
  --brand-2:#3f78f0;
  --brand-deep:#123a95;
  --gold:#b3892f;            /* 高级金(点缀) */
  --grad:linear-gradient(120deg,#1f52cc,#3f78f0);
  --grad-soft:linear-gradient(120deg,#eaf1ff,#f4f8ff);
  --radius:16px;
  --radius-lg:24px;
  --shadow-sm:0 2px 10px rgba(15,30,56,.05);
  --shadow:0 20px 50px -26px rgba(15,30,56,.24);
  --shadow-lg:0 34px 80px -34px rgba(15,30,56,.32);
  --max:1180px;
  --nav-h:74px;
  --font:"PingFang SC","Microsoft YaHei","Hiragino Sans GB",-apple-system,"Segoe UI",Roboto,Helvetica,Arial,sans-serif;
  --serif:Georgia,"Times New Roman","Songti SC",serif;
}

/* ---------- 基础重置 ---------- */
*{box-sizing:border-box;margin:0;padding:0}
/* 全局平滑滚动会让刷新时的位置恢复也变成动画(回闪)，改为仅点击锚点时平滑 */
section[id],#top{scroll-margin-top:84px}
body{
  font-family:var(--font);
  background:var(--bg);color:var(--body);line-height:1.7;
  overflow-x:hidden;-webkit-font-smoothing:antialiased;
}
a{color:inherit;text-decoration:none}
img{display:block;max-width:100%}
ul{list-style:none}
section{position:relative}
::selection{background:rgba(31,82,204,.16)}

/* ---------- 容器 / 版式 ---------- */
.wrap{width:min(90%,var(--max));margin-inline:auto}
.block{padding:clamp(70px,9vw,120px) 0}
.eyebrow{
  display:inline-flex;align-items:center;gap:10px;
  font-size:13px;letter-spacing:.16em;text-transform:uppercase;font-weight:700;
  color:var(--brand);margin-bottom:18px;
}
.eyebrow::before{content:"";width:24px;height:2px;background:var(--gold);border-radius:2px}
.eyebrow.gold{color:var(--gold)}
.eyebrow.light{color:#9fc0ff}
.eyebrow.light::before{background:#9fc0ff}
.title{
  font-size:clamp(28px,3.8vw,44px);font-weight:800;line-height:1.2;color:var(--ink);
  letter-spacing:-.01em;margin-bottom:16px;
}
.lead{color:var(--muted);font-size:clamp(15px,1.35vw,18px);max-width:640px;line-height:1.75}
.center{text-align:center}
.center .lead{margin-inline:auto}
.center .eyebrow::before{display:none}
.accent{color:var(--brand)}
.grad-text{background:var(--grad);-webkit-background-clip:text;background-clip:text;color:transparent}

/* ---------- 按钮 ---------- */
.btn{
  --pad:13px 26px;
  display:inline-flex;align-items:center;gap:9px;justify-content:center;
  padding:var(--pad);border-radius:12px;font-weight:700;font-size:15px;font-family:var(--font);
  cursor:pointer;transition:.25s ease;border:1px solid transparent;white-space:nowrap;
}
.btn svg{width:18px;height:18px}
.btn-primary{background:var(--brand);color:#fff;box-shadow:0 12px 26px -12px rgba(31,82,204,.7)}
.btn-primary:hover{background:var(--brand-deep);transform:translateY(-2px);box-shadow:0 18px 34px -14px rgba(31,82,204,.75)}
.btn-outline{background:#fff;border-color:var(--line-2);color:var(--ink)}
.btn-outline:hover{border-color:var(--brand);color:var(--brand);transform:translateY(-2px);box-shadow:var(--shadow-sm)}
.btn-light{background:#fff;color:var(--brand)}
.btn-light:hover{transform:translateY(-2px);box-shadow:0 16px 30px -14px rgba(0,0,0,.35)}
.btn-ghost-light{background:rgba(255,255,255,.08);border-color:rgba(255,255,255,.25);color:#fff}
.btn-ghost-light:hover{background:rgba(255,255,255,.16);transform:translateY(-2px)}
.btn-lg{--pad:16px 34px;font-size:16px}

/* ---------- 导航 ---------- */
.nav{position:fixed;top:0;left:0;right:0;z-index:100;height:var(--nav-h);display:flex;align-items:center;transition:.3s}
.nav.scrolled{background:rgba(255,255,255,.82);backdrop-filter:blur(16px) saturate(150%);border-bottom:1px solid var(--line);box-shadow:var(--shadow-sm)}
.nav .wrap{display:flex;align-items:center;justify-content:space-between;gap:20px}
.brand{display:flex;align-items:center;gap:12px}
.brand .mark{width:40px;height:40px;border-radius:11px;background:var(--grad);display:grid;place-items:center;
  box-shadow:0 8px 20px -8px rgba(31,82,204,.6);flex:0 0 auto}
.brand .mark svg{width:22px;height:22px;color:#fff}
.brand b{display:block;font-size:18px;font-weight:800;color:var(--ink);line-height:1.1}
.brand span{display:block;font-size:10.5px;color:var(--muted);letter-spacing:.16em;font-weight:600}
.nav-links{display:flex;align-items:center;gap:30px}
.nav-links a{color:var(--body);font-size:15px;font-weight:500;position:relative;transition:.2s}
.nav-links a:hover{color:var(--brand)}
.nav-links a::after{content:"";position:absolute;left:0;bottom:-6px;width:0;height:2px;background:var(--brand);transition:.3s;border-radius:2px}
.nav-links a:hover::after{width:100%}
.nav-actions{display:flex;align-items:center;gap:12px}
.burger{display:none;flex-direction:column;gap:5px;background:none;border:0;cursor:pointer;padding:8px}
.burger span{width:24px;height:2px;background:var(--ink);border-radius:2px;transition:.3s}

/* ---------- Hero ---------- */
.hero{position:relative;padding-top:calc(var(--nav-h) + clamp(46px,7vw,86px));padding-bottom:clamp(50px,7vw,90px);overflow:hidden}
.hero-bg{position:absolute;inset:0;z-index:-1;background:
  radial-gradient(60% 55% at 85% 0%,rgba(63,120,240,.10),transparent 60%),
  radial-gradient(50% 50% at 0% 20%,rgba(31,82,204,.07),transparent 55%),
  linear-gradient(180deg,#f6f9ff,#ffffff 60%)}
.hero-bg::after{content:"";position:absolute;inset:0;opacity:.5;
  background-image:linear-gradient(rgba(15,30,56,.035) 1px,transparent 1px),linear-gradient(90deg,rgba(15,30,56,.035) 1px,transparent 1px);
  background-size:46px 46px;-webkit-mask-image:radial-gradient(70% 60% at 60% 20%,#000,transparent 80%);mask-image:radial-gradient(70% 60% at 60% 20%,#000,transparent 80%)}
.hero .wrap{display:grid;grid-template-columns:1.05fr .95fr;gap:clamp(30px,5vw,60px);align-items:center}
.hero-badge{display:inline-flex;align-items:center;gap:9px;padding:7px 15px;border-radius:999px;background:#fff;
  border:1px solid var(--line);box-shadow:var(--shadow-sm);font-size:13px;color:var(--body);margin-bottom:24px}
.hero-badge i{width:7px;height:7px;border-radius:50%;background:#28c76f;box-shadow:0 0 0 4px rgba(40,199,111,.18)}
.hero h1{font-size:clamp(33px,4.6vw,54px);font-weight:900;line-height:1.12;color:var(--ink);letter-spacing:-.02em;margin-bottom:22px}
.hero p.sub{color:var(--body);font-size:clamp(15px,1.45vw,19px);max-width:520px;margin-bottom:34px}
.hero-cta{display:flex;gap:14px;flex-wrap:wrap;margin-bottom:36px}
.hero-trust{display:flex;align-items:center;gap:26px;flex-wrap:wrap}
.hero-trust .t b{font-family:var(--serif);font-size:clamp(24px,3vw,34px);color:var(--ink);font-weight:700;line-height:1}
.hero-trust .t span{font-size:13px;color:var(--muted)}
.hero-trust .sep{width:1px;height:34px;background:var(--line-2)}

/* Hero 视觉：浅色设备组合 */
.hero-visual{position:relative;display:flex;justify-content:center;align-items:center;min-height:440px}
.hero-visual .card-glow{position:absolute;width:70%;aspect-ratio:1;border-radius:50%;background:radial-gradient(circle,rgba(63,120,240,.18),transparent 65%);filter:blur(20px);z-index:0}
.float{animation:float 6s ease-in-out infinite}
@keyframes float{0%,100%{transform:translateY(0)}50%{transform:translateY(-14px)}}

/* ---------- 浅色浏览器 mockup ---------- */
.win{background:#fff;border:1px solid var(--line);border-radius:14px;overflow:hidden;box-shadow:var(--shadow-lg)}
.win .bar{display:flex;align-items:center;gap:12px;padding:11px 14px;background:#f7f9fc;border-bottom:1px solid var(--line)}
.win .lights{display:flex;gap:6px}
.win .lights i{width:10px;height:10px;border-radius:50%}
.win .lights i:nth-child(1){background:#ff5f57}.win .lights i:nth-child(2){background:#febc2e}.win .lights i:nth-child(3){background:#28c840}
.win .addr{flex:1;font-size:11.5px;color:var(--muted);background:#fff;border:1px solid var(--line);border-radius:7px;padding:5px 12px;display:flex;align-items:center;gap:6px}
.win .addr svg{width:12px;height:12px;color:#28c76f}

/* 管理后台 mockup 内容 */
.dash{display:grid;grid-template-columns:74px 1fr;height:300px}
.dash .side{background:#0f2350;padding:16px 12px;display:flex;flex-direction:column;gap:14px}
.dash .side .logo{width:26px;height:26px;border-radius:8px;background:var(--grad)}
.dash .side i{height:9px;border-radius:5px;background:rgba(255,255,255,.14)}
.dash .side i.on{background:rgba(255,255,255,.5)}
.dash .main{padding:16px 18px;background:#fbfcfe;overflow:hidden}
.dash .kpis{display:grid;grid-template-columns:repeat(3,1fr);gap:10px;margin-bottom:14px}
.dash .kpi{background:#fff;border:1px solid var(--line);border-radius:10px;padding:10px}
.dash .kpi b{display:block;font-family:var(--serif);font-size:18px;color:var(--ink)}
.dash .kpi span{font-size:9px;color:var(--muted)}
.dash .chart{background:#fff;border:1px solid var(--line);border-radius:10px;padding:14px;height:150px;display:flex;align-items:flex-end;gap:8px}
.dash .chart .col{flex:1;border-radius:5px 5px 0 0;background:var(--grad);opacity:.85}
.hero-visual .float2{position:absolute;right:-3%;bottom:-4%;z-index:3;width:150px}

/* ---------- 浅色手机 mockup ---------- */
.phone{width:210px;background:#fff;border-radius:32px;padding:9px;border:1px solid var(--line);
  box-shadow:var(--shadow-lg);flex:0 0 auto}
.phone .scr{border-radius:24px;overflow:hidden;background:#fbfcfe;aspect-ratio:9/18.5;display:flex;flex-direction:column}
.phone .pnotch{height:20px;position:relative}
.phone .pnotch::after{content:"";position:absolute;top:6px;left:50%;transform:translateX(-50%);width:34%;height:5px;border-radius:5px;background:#e6ecf5}

/* ---------- 客户/技术条 ---------- */
.strip-logos{border-block:1px solid var(--line);background:var(--bg-soft)}
.strip-logos .wrap{display:flex;align-items:center;justify-content:center;gap:clamp(26px,5vw,64px);flex-wrap:wrap;padding:30px 0}
.strip-logos span{color:var(--muted);font-size:15px;font-weight:600;letter-spacing:.02em;opacity:.85}

/* ---------- 服务 ---------- */
.svc-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:22px;margin-top:54px}
.svc{background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:32px 28px;transition:.3s;position:relative;overflow:hidden}
.svc::after{content:"";position:absolute;left:0;top:0;height:3px;width:0;background:var(--grad);transition:.35s}
.svc:hover{transform:translateY(-6px);box-shadow:var(--shadow);border-color:transparent}
.svc:hover::after{width:100%}
.svc .ic{width:54px;height:54px;border-radius:14px;display:grid;place-items:center;margin-bottom:20px;
  background:var(--grad-soft);border:1px solid var(--line);color:var(--brand)}
.svc .ic svg{width:26px;height:26px}
.svc h3{font-size:20px;font-weight:800;color:var(--ink);margin-bottom:10px}
.svc p{color:var(--muted);font-size:14.5px;margin-bottom:16px}
.svc .tags{display:flex;flex-wrap:wrap;gap:7px}
.svc .tags i{font-style:normal;font-size:12px;color:var(--brand);background:var(--grad-soft);border:1px solid var(--line);padding:4px 10px;border-radius:7px}

/* ---------- 案例 ---------- */
.cases-head{display:flex;align-items:flex-end;justify-content:space-between;gap:20px;flex-wrap:wrap}
.filter{display:inline-flex;gap:6px;background:#fff;border:1px solid var(--line);border-radius:12px;padding:5px}
.filter button{border:0;background:none;font-family:var(--font);color:var(--muted);font-size:14px;font-weight:600;padding:8px 16px;border-radius:8px;cursor:pointer;transition:.25s}
.filter button.on{background:var(--brand);color:#fff}
.case-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:22px;margin-top:44px}
.case{background:#fff;border:1px solid var(--line);border-radius:var(--radius);overflow:hidden;transition:.35s;display:flex;flex-direction:column}
.case:hover{transform:translateY(-6px);box-shadow:var(--shadow);border-color:transparent}
.case .cover{position:relative;aspect-ratio:16/11;overflow:hidden;background:var(--bg-soft2);display:grid;place-items:center}
.case .cover .tag{position:absolute;top:12px;left:12px;z-index:3;font-size:12px;font-weight:700;color:#fff;background:rgba(13,27,51,.62);backdrop-filter:blur(4px);padding:5px 11px;border-radius:8px}
.case .body{padding:22px 22px 24px}
.case .body h3{font-size:18.5px;font-weight:800;color:var(--ink);margin-bottom:8px}
.case .body p{color:var(--muted);font-size:14px;margin-bottom:14px}
.case .body .res{display:flex;gap:18px;border-top:1px solid var(--line);padding-top:14px}
.case .body .res b{display:block;font-family:var(--serif);font-size:18px;color:var(--brand);line-height:1}
.case .body .res span{font-size:11.5px;color:var(--muted)}
.case.hide{display:none}

/* 案例封面里的迷你 mockup */
.mini-app{width:118px;background:#fff;border-radius:20px;padding:6px;box-shadow:var(--shadow);border:1px solid var(--line)}
.mini-app .top{height:14px;position:relative}
.mini-app .top::after{content:"";position:absolute;top:4px;left:50%;transform:translateX(-50%);width:30%;height:4px;border-radius:4px;background:#e6ecf5}
.mini-app .grid2{columns:2;column-gap:5px;padding:0 6px 6px}
.mini-app .grid2 img{width:100%;border-radius:6px;margin-bottom:5px;break-inside:avoid}
.mini-web{width:78%;border-radius:10px;overflow:hidden;box-shadow:var(--shadow);border:1px solid var(--line);background:#fff}
.mini-web .b{height:16px;background:#f2f5fa;border-bottom:1px solid var(--line);display:flex;align-items:center;gap:3px;padding-left:8px}
.mini-web .b i{width:5px;height:5px;border-radius:50%;background:#d7e0ee}
.mini-web .c{padding:12px}
.mini-web .c .h{height:8px;width:55%;border-radius:4px;background:var(--grad);margin-bottom:7px}
.mini-web .c .l{height:6px;border-radius:3px;background:#e9eef6;margin-bottom:5px}
.mini-web .c .l.s{width:70%}
.mini-web .c .row{display:grid;grid-template-columns:repeat(3,1fr);gap:6px;margin-top:10px}
.mini-web .c .row div{height:26px;border-radius:6px;background:var(--bg-soft2)}
.cover-fill{width:100%;height:100%;object-fit:cover}
.cover-grad{position:absolute;inset:0;background:linear-gradient(135deg,rgba(31,82,204,.14),rgba(63,120,240,.05))}

/* ---------- 优势 ---------- */
.why{background:var(--bg-soft)}
.why-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:22px;margin-top:52px}
.why .item{background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:28px 24px;transition:.3s}
.why .item:hover{transform:translateY(-5px);box-shadow:var(--shadow)}
.why .item .ic{width:48px;height:48px;border-radius:12px;display:grid;place-items:center;margin-bottom:16px;background:var(--grad-soft);color:var(--brand);border:1px solid var(--line)}
.why .item .ic svg{width:24px;height:24px}
.why .item h4{font-size:17px;font-weight:800;color:var(--ink);margin-bottom:8px}
.why .item p{color:var(--muted);font-size:13.8px}

/* ---------- 流程 ---------- */
.steps{display:grid;grid-template-columns:repeat(5,1fr);gap:16px;margin-top:56px;position:relative}
.steps::before{content:"";position:absolute;top:30px;left:9%;right:9%;height:2px;background:linear-gradient(90deg,var(--line-2),var(--brand),var(--line-2))}
.step{text-align:center;position:relative}
.step .no{width:60px;height:60px;margin:0 auto 18px;border-radius:16px;display:grid;place-items:center;
  font-family:var(--serif);font-size:22px;font-weight:700;color:var(--brand);background:#fff;border:1px solid var(--line-2);
  box-shadow:var(--shadow-sm);position:relative;z-index:2}
.step h4{font-size:16px;font-weight:800;color:var(--ink);margin-bottom:6px}
.step p{color:var(--muted);font-size:13px}

/* ---------- 数据带 ---------- */
.stats{background:var(--navy);position:relative;overflow:hidden}
.stats::before{content:"";position:absolute;inset:0;background:radial-gradient(50% 120% at 80% 0,rgba(63,120,240,.28),transparent 60%)}
.stats .wrap{position:relative;display:grid;grid-template-columns:repeat(4,1fr);gap:24px;padding:64px 0}
.stats .s{text-align:center}
.stats .s b{display:block;font-family:var(--serif);font-size:clamp(32px,4vw,48px);font-weight:700;color:#fff;line-height:1}
.stats .s b em{font-style:normal;color:#7fa8ff}
.stats .s span{color:#a9b8d4;font-size:14px}

/* ---------- CTA 区 ---------- */
.cta .box{background:var(--navy);border-radius:var(--radius-lg);padding:clamp(40px,5vw,68px);position:relative;overflow:hidden;
  display:grid;grid-template-columns:1.15fr .85fr;gap:44px;align-items:center}
.cta .box::before{content:"";position:absolute;pointer-events:none;width:420px;height:420px;border-radius:50%;top:-180px;right:-120px;background:radial-gradient(circle,rgba(63,120,240,.4),transparent 70%)}
.cta .box::after{content:"";position:absolute;pointer-events:none;inset:0;opacity:.4;background-image:linear-gradient(rgba(255,255,255,.05) 1px,transparent 1px),linear-gradient(90deg,rgba(255,255,255,.05) 1px,transparent 1px);background-size:40px 40px;-webkit-mask-image:radial-gradient(60% 100% at 20% 100%,#000,transparent 75%);mask-image:radial-gradient(60% 100% at 20% 100%,#000,transparent 75%)}
.cta .box>div{position:relative}
.cta h2{font-size:clamp(26px,3.2vw,38px);font-weight:900;color:#fff;margin-bottom:14px;line-height:1.25}
.cta h2 em{font-style:normal;color:#7fa8ff}
.cta p{color:#b6c4de;margin-bottom:28px;font-size:15px}
.contact-list{display:grid;gap:12px}
.contact-list a{display:flex;align-items:center;gap:14px;padding:15px 18px;border-radius:13px;background:rgba(255,255,255,.06);border:1px solid rgba(255,255,255,.12);transition:.25s}
.contact-list a:hover{background:rgba(255,255,255,.1);transform:translateX(5px)}
.contact-list .ic{width:44px;height:44px;border-radius:12px;display:grid;place-items:center;background:var(--grad);color:#fff;flex:0 0 auto}
.contact-list .ic svg{width:20px;height:20px}
.contact-list b{font-size:16px;color:#fff;display:block}
.contact-list small{font-size:12.5px;color:#9fb0cc}

/* ---------- 页脚 ---------- */
footer{background:#0a1424;color:#9fb0cc;padding:64px 0 30px}
.foot-top{display:grid;grid-template-columns:1.6fr 1fr 1fr 1fr;gap:34px;margin-bottom:44px}
.foot-brand .brand b{color:#fff}
.foot-brand .brand span{color:#7a89a6}
.foot-brand p{margin-top:16px;font-size:14px;color:#8c9bb8;max-width:320px}
.foot-col h5{color:#fff;font-size:14px;font-weight:700;margin-bottom:16px}
.foot-col a{display:block;color:#8c9bb8;font-size:13.5px;margin-bottom:11px;transition:.2s}
.foot-col a:hover{color:#fff}
.foot-bottom{border-top:1px solid rgba(255,255,255,.08);padding-top:24px;display:flex;flex-wrap:wrap;justify-content:space-between;gap:14px;align-items:center}
.foot-bottom .copy{font-size:13px;color:#7a89a6}
.beian{display:flex;flex-wrap:wrap;gap:10px 20px;align-items:center;font-size:12.5px}
.beian a{display:inline-flex;align-items:center;gap:7px;color:#8c9bb8;transition:.2s}
.beian a:hover{color:#fff}
.beian svg{width:15px;height:15px;flex:0 0 auto}

/* ---------- 揭示动画 ---------- */
html.js .reveal:not(.in){opacity:0;transform:translateY(26px)}
.reveal{transition:.7s cubic-bezier(.2,.7,.2,1)}
.reveal.in{opacity:1;transform:none}

/* 返回顶部 */
.backtop{position:fixed;right:28px;bottom:28px;width:48px;height:48px;border-radius:50%;z-index:90;
  display:grid;place-items:center;cursor:pointer;color:var(--ink);
  background:rgba(255,255,255,.92);backdrop-filter:blur(10px) saturate(150%);
  border:1px solid var(--line-2);
  box-shadow:0 10px 28px -10px rgba(15,30,56,.28),0 2px 6px rgba(15,30,56,.06);
  opacity:0;pointer-events:none;transform:translateY(14px) scale(.9);
  transition:opacity .35s ease,transform .35s cubic-bezier(.2,.8,.2,1),box-shadow .3s,border-color .3s,color .3s}
/* 随滚动进度填充的品牌色细环 */
.backtop::before{content:"";position:absolute;inset:-4px;border-radius:50%;pointer-events:none;
  background:conic-gradient(var(--brand) calc(var(--p,0)*1%),rgba(31,82,204,.14) 0);
  -webkit-mask:radial-gradient(farthest-side,#0000 calc(100% - 3px),#000 0);
          mask:radial-gradient(farthest-side,#0000 calc(100% - 3px),#000 0);
  transition:background .12s linear}
.backtop.show{opacity:1;pointer-events:auto;transform:none}
.backtop:hover{color:var(--brand);border-color:transparent;transform:translateY(-3px);
  box-shadow:0 18px 38px -12px rgba(31,82,204,.45)}
.backtop svg{width:18px;height:18px;transition:transform .3s ease}
.backtop:hover svg{transform:translateY(-2px)}

/* ============================================================
   响应式
   ============================================================ */
@media (max-width:1024px){
  .svc-grid,.case-grid{grid-template-columns:repeat(2,1fr)}
  .why-grid{grid-template-columns:repeat(2,1fr)}
  .steps{grid-template-columns:repeat(3,1fr);gap:26px}
  .steps::before{display:none}
}
@media (max-width:860px){
  .nav-links{position:fixed;top:var(--nav-h);left:0;right:0;flex-direction:column;gap:0;background:#fff;
    border-bottom:1px solid var(--line);box-shadow:var(--shadow);padding:8px 0;transform:translateY(-120%);opacity:0;pointer-events:none;transition:.35s}
  .nav-links.open{transform:none;opacity:1;pointer-events:auto}
  .nav-links a{padding:14px 6%;width:100%}
  .nav-links a::after{display:none}
  .burger{display:flex}
  .nav-actions .btn-outline{display:none}
  .hero .wrap{grid-template-columns:1fr;text-align:center}
  .hero-badge,.hero-cta,.hero-trust{justify-content:center}
  .hero p.sub{margin-inline:auto}
  .hero-visual{min-height:auto;margin-top:14px}
  .cta .box{grid-template-columns:1fr}
  .stats .wrap{grid-template-columns:repeat(2,1fr);gap:36px}
  .foot-top{grid-template-columns:1fr 1fr}
}
@media (max-width:560px){
  .svc-grid,.case-grid,.why-grid{grid-template-columns:1fr}
  .steps{grid-template-columns:1fr 1fr}
  .cases-head{flex-direction:column;align-items:flex-start}
  .foot-top{grid-template-columns:1fr}
  .foot-bottom{flex-direction:column;align-items:flex-start}
  .brand span{display:none}
  .hero-trust .sep{display:none}
}

/* 案例底部：改为客观的技术/功能标签(替代统计数字) */
.case .body .feat{display:flex;flex-wrap:wrap;gap:7px;border-top:1px solid var(--line);padding-top:14px}
.case .body .feat i{font-style:normal;font-size:12px;color:var(--brand);background:var(--grad-soft);border:1px solid var(--line);padding:4px 10px;border-radius:7px}

/* 语言切换按钮 */
.lang{display:inline-flex;align-items:center;gap:6px;height:42px;padding:0 14px;border-radius:11px;
  border:1px solid var(--line-2);background:#fff;color:var(--ink);font-family:var(--font);
  font-weight:700;font-size:13px;letter-spacing:.02em;cursor:pointer;transition:.25s}
.lang:hover{border-color:var(--brand);color:var(--brand)}
.lang svg{width:16px;height:16px}
@media (max-width:560px){.lang{padding:0 10px;height:40px}.lang svg{width:15px;height:15px}}

/* ---------- PLC 产线：样式限定在独立模块内，沿用门户品牌色 ---------- */
.plc{background:linear-gradient(180deg,#fff,#f5f8fd)}
.plc-heading{display:flex;align-items:flex-end;justify-content:space-between;gap:36px;margin-bottom:36px}
.plc-heading .lead{max-width:660px}
.plc-capabilities{display:grid;grid-template-columns:1fr 1fr;gap:10px;flex-shrink:0;padding-bottom:4px}
.plc-capabilities span{font-size:12px;color:var(--brand);border:1px solid var(--line-2);border-radius:7px;padding:7px 11px;background:#fff}
.plc-console{--plc-line:rgba(158,185,221,.16);overflow:hidden;border:1px solid #263c58;border-radius:20px;background:#101e31;color:#d5e3f7;box-shadow:0 24px 70px -28px rgba(15,30,56,.5);text-align:left}
.plc-topbar{display:flex;justify-content:space-between;align-items:center;gap:16px;padding:22px 26px;border-bottom:1px solid var(--plc-line)}
.plc-line-title{display:flex;align-items:center;gap:12px}
.plc-line-title b{font-size:17px;font-weight:650;letter-spacing:.03em}
.plc-line-title small{display:block;font-size:9px;letter-spacing:.2em;color:#7e9ab9;margin-top:2px}
.plc-live-dot,.plc-device-status i{width:8px;height:8px;display:inline-block;border-radius:50%;background:#48dfbd;box-shadow:0 0 14px #48dfbd55;flex-shrink:0}
.plc-demo{font-size:11px;border:1px solid #5c5337;background:#302b22;color:#e5c880;padding:5px 10px;border-radius:5px}
.plc-kpis{display:grid;grid-template-columns:repeat(4,1fr);border-bottom:1px solid var(--plc-line);background:#14243a}
.plc-kpis>div{padding:17px 26px;position:relative}
.plc-kpis>div+div::before{content:"";position:absolute;left:0;top:22px;bottom:22px;width:1px;background:var(--plc-line)}
.plc-kpis>div>span{font-size:11px;color:#8ba4c1;display:block}
.plc-kpis b{font-size:25px;line-height:1.8;display:block;color:#f0f6ff;font-weight:500;font-variant-numeric:tabular-nums}
.plc-kpis b small{font-size:11px;font-weight:400;color:#88a5c8}
.plc-kpis .plc-kpi-stage{font-size:18px;padding-top:6px;line-height:1.9}
.plc-workspace{display:grid;grid-template-columns:minmax(0,1fr) 280px}
.plc-view{min-width:0;position:relative;display:flex;flex-direction:column;background:#0e1a2a}
.plc-toolbar{position:absolute;top:14px;left:14px;right:14px;z-index:2;display:flex;flex-wrap:wrap;gap:5px;pointer-events:none}
.plc-console button{font:inherit;cursor:pointer;transition:background .2s,border-color .2s,color .2s}
.plc-toolbar button,.plc-loading button{background:#1c304be6;border:1px solid #39516c;color:#c8daf0;border-radius:5px;padding:5px 10px;font-size:11px;pointer-events:auto}
.plc-toolbar button:hover,.plc-loading button:hover{background:#294868;color:#fff;border-color:#80c9e3}
.plc-console button:focus-visible,.plc-canvas canvas:focus-visible{outline:2px solid #6df0d8;outline-offset:3px}
.plc-console button:disabled{opacity:.4;cursor:wait}
.plc-toolbar button[aria-pressed="true"]{color:#edcc87;border-color:#ae9559}
.plc-canvas{height:470px;position:relative;flex:1;min-height:380px;overflow:hidden}
.plc-canvas canvas{display:block;width:100%;height:100%;touch-action:none;cursor:grab}
.plc-canvas canvas:active{cursor:grabbing}
.plc-loading{position:absolute;inset:0;z-index:1;display:flex;flex-direction:column;justify-content:center;align-items:center;gap:16px;padding:30px;color:#94b2d2;font-size:13px;text-align:center;background:#0e1a2a}
.plc-loading[hidden],.plc-console [hidden]{display:none!important}
.plc-loader{width:26px;height:26px;border:2px solid #294461;border-top-color:#64d8df;border-radius:50%;animation:plc-spin 1s linear infinite}
@keyframes plc-spin{to{transform:rotate(360deg)}}
.plc-scene-caption{padding:10px 16px;display:flex;align-items:center;justify-content:space-between;gap:8px;font-size:10px;color:#89a2c1;border-top:1px solid var(--plc-line);flex-wrap:wrap}
.plc-scene-caption>span:first-child{display:flex;align-items:center;gap:7px;color:#7cd4cf}
.plc-scene-caption i{width:5px;height:5px;background:#5dcac2;border-radius:50%}
.plc-detail{padding:23px 23px 20px;border-left:1px solid var(--plc-line);background:#15253a;min-width:0}
.plc-detail-label{display:flex;justify-content:space-between;gap:10px;font-size:10px;letter-spacing:.08em;color:#8ba4c1;margin-bottom:16px}
.plc-detail-label span:last-child{color:#6ee1d1;font-family:monospace}
.plc-detail h3{font-size:22px;color:#f0f6ff;line-height:1.35;margin-bottom:8px}
.plc-detail>p{font-size:11px;line-height:1.8;min-height:40px;color:#91a9c5}
.plc-device-status{display:flex;align-items:center;gap:7px;font-size:11px;color:#65d9bd;margin:12px 0 17px}
.plc-device-status i{width:5px;height:5px}
.plc-detail dl{display:grid;grid-template-columns:1fr 1fr;gap:10px 8px;font-size:12px;border-block:1px solid var(--plc-line);padding:15px 0;margin-bottom:17px;font-variant-numeric:tabular-nums}
.plc-detail dt{color:#8ba4c1}.plc-detail dd{text-align:right;color:#e0eafa;overflow-wrap:anywhere}
.plc-trend>div:first-child{display:flex;justify-content:space-between;align-items:center;gap:6px;font-size:11px;color:#a7bcd6}
.plc-trend small{font-size:9px;color:#7994b3}
.plc-trend svg{width:100%;height:64px;margin-top:10px;overflow:visible}
.plc-trend-grid{stroke:#2a3e56;stroke-width:1;fill:none;stroke-dasharray:3 4}
#plc-trend-line{fill:none;stroke:#5de0ce;stroke-width:2;stroke-linecap:round;stroke-linejoin:round}
.plc-trend-range{display:flex;justify-content:space-between;font-size:9px;color:#8ba4c1;font-variant-numeric:tabular-nums;margin-bottom:16px}
.plc-focus{width:100%;padding:10px;background:#254265;border:1px solid #3c618a;border-radius:6px;color:#d7e9ff;font-size:12px!important}
.plc-focus:hover{background:#305680}
.plc-process{padding:18px 24px 20px;border-top:1px solid var(--plc-line)}
.plc-process-head{display:flex;justify-content:space-between;font-size:10px;color:#849ebe;letter-spacing:.06em;margin-bottom:12px}
.plc-stations{display:grid;grid-template-columns:repeat(7,minmax(0,1fr));gap:9px}
.plc-stations button{position:relative;display:flex;align-items:center;gap:8px;padding:10px 9px;border:1px solid #2a405d;background:#182a40;color:#a9c0dd;font-size:11px;border-radius:6px;text-align:left;min-width:0}
.plc-stations button small{font-family:monospace;font-size:10px;color:#6b87a9}
.plc-stations button::after{content:"";position:absolute;bottom:-1px;left:10%;right:10%;height:2px;background:transparent}
.plc-stations button.is-current::after{background:#55dfc8}
.plc-stations button[aria-pressed="true"],.plc-auxiliary button[aria-pressed="true"]{border-color:#68c6dc;background:#203e58;color:#a1f5ec}
.plc-stations button:hover,.plc-auxiliary button:hover{border-color:#70a3c3;color:#fff}
.plc-auxiliary{display:flex;gap:8px;align-items:center;flex-wrap:wrap;margin-top:13px}
.plc-auxiliary>span{font-size:10px;color:#708daa;margin-right:4px}
.plc-auxiliary button{font-size:10px;color:#9eb7d2;background:transparent;border:1px solid #2a405d;border-radius:5px;padding:4px 11px}
.plc-footer{display:flex;justify-content:space-between;gap:15px;align-items:center;margin-top:19px;font-size:12px;color:var(--muted)}
.plc-footer a{color:var(--brand);font-weight:600;white-space:nowrap}
.plc-noscript{padding:20px;color:#edcc87}
.plc-console:fullscreen{border:0;border-radius:0;width:100%;height:100%;overflow:auto;display:flex;flex-direction:column}
.plc-console:fullscreen .plc-workspace{flex:1;min-height:0}.plc-console:fullscreen .plc-canvas{height:auto;min-height:320px}
/* 新导航项在中等宽度下隐藏次要 CTA，为中英文菜单留出空间。 */
@media (min-width:861px) and (max-width:1250px){.nav-actions .btn-outline{display:none}.nav-links{gap:15px}.nav-links a{font-size:12px}.nav-actions .btn-primary{padding:10px 13px}}
@media (max-width:1050px){.plc-heading{align-items:flex-start;flex-direction:column;gap:22px}.plc-capabilities{display:flex;flex-wrap:wrap}.plc-workspace{grid-template-columns:minmax(0,1fr) 250px}.plc-detail{padding:20px 17px}.plc-stations button{flex-direction:column;gap:2px;align-items:flex-start}}
@media (max-width:760px){.plc-workspace{grid-template-columns:1fr}.plc-detail{border-left:0;border-top:1px solid var(--plc-line);display:grid;grid-template-columns:1fr 1fr;gap:0 22px}.plc-detail-label,.plc-detail h3,.plc-detail>p,.plc-device-status{grid-column:1/-1}.plc-detail>p{min-height:0}.plc-detail dl{grid-column:1;margin-bottom:0}.plc-trend{grid-column:2;grid-row:5}.plc-focus{grid-column:1/-1;margin-top:16px}.plc-canvas{height:410px;flex:none}.plc-kpis>div{padding:13px 16px}.plc-topbar{padding:18px;flex-wrap:wrap}.plc-footer{align-items:flex-start;flex-direction:column}.plc-stations{gap:5px}.plc-process{padding:16px}.plc-stations button{padding:8px 5px}.plc-console:fullscreen .plc-canvas{height:54vh}}
@media (max-width:480px){.plc-kpis{grid-template-columns:repeat(2,1fr)}.plc-kpis>div:nth-child(3){border-top:1px solid var(--plc-line)}.plc-kpis>div:nth-child(4){border-top:1px solid var(--plc-line)}.plc-kpis>div:nth-child(3)::before{display:none}.plc-canvas{height:350px;min-height:350px}.plc-toolbar{gap:4px;left:10px;right:10px;top:10px}.plc-toolbar button{font-size:10px;padding:5px 8px}.plc-stations{grid-template-columns:repeat(4,minmax(0,1fr))}.plc-detail{gap:0 14px}.plc-capabilities span{font-size:11px;padding:6px 8px}.plc-detail dl{font-size:11px}.plc-trend>div:first-child{align-items:flex-start;flex-direction:column}.plc-scene-caption{font-size:9px}}
@media (prefers-reduced-motion:reduce){.plc-loader{animation:none}.plc-console button{transition:none}}