/* ============================================================
   无锡唯易特科技有限公司 官网 共享样式 v2
   纯静态、无外部依赖；移动优先、响应式。
   ============================================================ */
:root{
  --brand:#0B5CD5; --brand-dark:#072C6B; --brand-soft:#EAF1FE;
  --accent:#00C9A7; --warn:#FF8A3D;
  --ink:#0F172A; --muted:#5A6B85; --line:#E3EAF3; --soft:#F5F8FC; --white:#fff;
  --r:16px; --shadow:0 10px 30px rgba(11,92,213,.10); --shadow-lg:0 20px 50px rgba(7,44,107,.18);
  --max:1200px;
}
*{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth}
body{font-family:system-ui,-apple-system,"Segoe UI","PingFang SC","Microsoft YaHei",sans-serif;color:var(--ink);background:var(--white);line-height:1.7;-webkit-font-smoothing:antialiased}
img{max-width:100%;display:block}
a{color:inherit;text-decoration:none}
.wrap{max-width:var(--max);margin:0 auto;padding:0 24px}

/* ============ 顶部导航 ============ */
/* 注意：sticky 头部去掉 backdrop-filter —— 全宽模糊会随滚动每帧重绘，
   在低端安卓/iOS 上掉帧明显；改用近不透明白底，观感几乎无差别。 */
.hdr{position:sticky;top:0;z-index:50;background:rgba(255,255,255,.97);border-bottom:1px solid var(--line)}
.hdr .wrap{display:flex;align-items:center;justify-content:space-between;height:68px}
.logo{display:flex;align-items:center;gap:10px;font-weight:800;font-size:19px;letter-spacing:.5px}
.logo .mark{width:34px;height:34px;border-radius:10px;background:linear-gradient(135deg,var(--brand),var(--accent));display:flex;align-items:center;justify-content:center;color:#fff;font-size:15px;font-weight:900}
.logo small{display:block;font-size:11px;font-weight:500;color:var(--muted);letter-spacing:2px;line-height:1}
.nav{display:flex;gap:30px;font-size:15px}
.nav a{color:#334155;position:relative;padding:6px 0;transition:color .2s}
.nav a:hover{color:var(--brand)}
.nav a.on{color:#083F9E;font-weight:700}
.nav a.on::after{content:"";position:absolute;left:0;right:0;bottom:-4px;height:3px;background:linear-gradient(90deg,var(--brand),var(--accent));border-radius:3px}
.hdr-cta{display:flex;align-items:center;gap:14px}
.btn{display:inline-flex;align-items:center;gap:8px;padding:10px 20px;border-radius:10px;font-size:15px;font-weight:600;transition:.2s;cursor:pointer;border:none}
.btn-primary{background:var(--brand);color:#fff;box-shadow:0 6px 16px rgba(11,92,213,.28)}
.btn-primary:hover{background:#0A4FBA;transform:translateY(-1px)}
.btn-ghost{border:1px solid var(--line);color:var(--ink);background:#fff}
.btn-ghost:hover{border-color:var(--brand);color:var(--brand)}
.btn-white{background:#fff;color:var(--brand)}
.btn-white:hover{transform:translateY(-1px)}
.btn-line{border:1px solid rgba(255,255,255,.5);color:#fff;background:transparent}
.btn-line:hover{background:rgba(255,255,255,.12)}
.burger{display:none;width:40px;height:40px;border:1px solid var(--line);border-radius:10px;background:#fff;cursor:pointer;align-items:center;justify-content:center;font-size:20px;color:var(--brand)}

/* ============ 首页首屏 ============ */
.hero{position:relative;background:linear-gradient(135deg,#072C6B 0%,#0B5CD5 55%,#0E7BC4 100%);color:#fff;overflow:hidden}
.hero::before{content:"";position:absolute;inset:0;background-image:linear-gradient(rgba(255,255,255,.07) 1px,transparent 1px),linear-gradient(90deg,rgba(255,255,255,.07) 1px,transparent 1px);background-size:52px 52px;-webkit-mask-image:radial-gradient(circle at 70% 40%,#000 0%,transparent 72%);mask-image:radial-gradient(circle at 70% 40%,#000 0%,transparent 72%)}
.hero .wrap{position:relative;display:grid;grid-template-columns:1.05fr .95fr;gap:56px;align-items:center;padding-top:76px;padding-bottom:76px}
.badge{display:inline-flex;align-items:center;gap:8px;background:rgba(255,255,255,.14);border:1px solid rgba(255,255,255,.25);padding:6px 14px;border-radius:999px;font-size:13px;margin-bottom:22px}
.badge .dot{width:7px;height:7px;border-radius:50%;background:var(--accent);box-shadow:0 0 0 4px rgba(0,201,167,.25)}
.hero h1{font-size:44px;line-height:1.25;font-weight:800;letter-spacing:-.5px}
.hero h1 em{font-style:normal;color:#8FE9D4}
.hero .sub{margin-top:20px;font-size:17px;color:rgba(255,255,255,.85);max-width:520px}
.hero-actions{display:flex;gap:14px;margin-top:32px;flex-wrap:wrap}
.stats{display:flex;gap:38px;margin-top:44px;flex-wrap:wrap}
.stats b{display:block;font-size:30px;font-weight:800;letter-spacing:-.5px}
.stats span{font-size:13px;color:rgba(255,255,255,.72)}

/* 首屏右侧能源看板示意 */
.panel{background:rgba(255,255,255,.1);border:1px solid rgba(255,255,255,.22);border-radius:20px;padding:20px;-webkit-backdrop-filter:blur(8px);backdrop-filter:blur(8px);box-shadow:var(--shadow-lg)}
.panel-top{display:flex;align-items:center;justify-content:space-between;font-size:13px;color:rgba(255,255,255,.8);margin-bottom:14px}
.panel-top .tag{background:rgba(0,201,167,.22);border:1px solid rgba(0,201,167,.5);color:#7FF0DA;padding:3px 10px;border-radius:999px;font-size:12px}
.kpis{display:grid;grid-template-columns:repeat(3,1fr);gap:12px}
.kpi{background:rgba(255,255,255,.1);border-radius:12px;padding:12px}
.kpi span{font-size:12px;color:rgba(255,255,255,.7)}
.kpi b{display:block;font-size:20px;margin-top:2px}
.kpi i{font-style:normal;font-size:12px;color:#7FF0DA}
.chart{background:rgba(255,255,255,.08);border-radius:12px;padding:14px;margin-top:12px}
.chart .t{font-size:12px;color:rgba(255,255,255,.75);display:flex;justify-content:space-between;margin-bottom:8px}
.rows{margin-top:12px;display:grid;gap:8px}
.row{display:flex;align-items:center;justify-content:space-between;background:rgba(255,255,255,.08);border-radius:10px;padding:9px 12px;font-size:13px}
.row i{font-style:normal;width:8px;height:8px;border-radius:50%}

/* ============ 内页头图 + 面包屑 ============ */
.page-hero{background:linear-gradient(135deg,#072C6B 0%,#0B5CD5 100%);color:#fff;padding:64px 0 56px;position:relative;overflow:hidden}
.page-hero::before{content:"";position:absolute;inset:0;background-image:linear-gradient(rgba(255,255,255,.06) 1px,transparent 1px),linear-gradient(90deg,rgba(255,255,255,.06) 1px,transparent 1px);background-size:48px 48px;-webkit-mask-image:radial-gradient(circle at 80% 20%,#000,transparent 70%);mask-image:radial-gradient(circle at 80% 20%,#000,transparent 70%)}
.page-hero .wrap{position:relative}
.breadcrumb{font-size:13px;color:rgba(255,255,255,.7);margin-bottom:14px}
.breadcrumb a{color:rgba(255,255,255,.85)}
.breadcrumb a:hover{color:#fff;text-decoration:underline}
.breadcrumb span{margin:0 8px;opacity:.6}
.page-hero h1{font-size:38px;font-weight:800;letter-spacing:-.5px;line-height:1.25}
.page-hero p{margin-top:14px;font-size:17px;color:rgba(255,255,255,.82);max-width:680px}

/* ============ 通用区块 ============ */
section{padding:84px 0}
section[id]{scroll-margin-top:76px}
.sec-head{text-align:center;max-width:680px;margin:0 auto 48px}
.eyebrow{display:inline-block;color:var(--brand);font-size:13px;font-weight:700;letter-spacing:2px;text-transform:uppercase;margin-bottom:10px}
.sec-head h2{font-size:34px;line-height:1.3;font-weight:800;letter-spacing:-.3px}
.sec-head p{margin-top:14px;color:var(--muted);font-size:16px}
.soft{background:var(--soft)}
.lead{color:var(--muted);font-size:16px;max-width:760px;margin:0 auto;text-align:center}

/* ============ 服务卡片 ============ */
.grid3{display:grid;grid-template-columns:repeat(3,1fr);gap:22px}
.card{background:#fff;border:1px solid var(--line);border-radius:var(--r);padding:28px;transition:.25s;position:relative;overflow:hidden}
.card:hover{transform:translateY(-4px);box-shadow:var(--shadow);border-color:#C9DDFB}
.card .ico{width:46px;height:46px;border-radius:12px;background:var(--brand-soft);display:flex;align-items:center;justify-content:center;margin-bottom:16px}
.card h3{font-size:19px;margin-bottom:10px}
.card p{color:var(--muted);font-size:15px}
.card ul{margin-top:14px;display:grid;gap:6px}
.card li{list-style:none;font-size:14px;color:var(--muted);padding-left:18px;position:relative}
.card li::before{content:"";position:absolute;left:0;top:9px;width:6px;height:6px;border-radius:50%;background:var(--accent)}

/* ============ AI 服务 ============ */
.ai{background:linear-gradient(155deg,#0A172E 0%,#0B3C8F 100%);color:#fff;position:relative;overflow:hidden}
.ai::before{content:"";position:absolute;inset:0;background-image:radial-gradient(circle at 82% 12%,rgba(0,201,167,.22),transparent 45%),radial-gradient(circle at 12% 88%,rgba(11,92,213,.35),transparent 50%)}
.ai .wrap{position:relative}
.ai .eyebrow{color:#7FF0DA}
.ai .sec-head h2{color:#fff}
.ai .sec-head p{color:rgba(255,255,255,.75)}
.ai-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:20px}
.ai-card{background:rgba(255,255,255,.07);border:1px solid rgba(255,255,255,.16);border-radius:var(--r);padding:26px;transition:.25s;-webkit-backdrop-filter:blur(4px);backdrop-filter:blur(4px)}
.ai-card:hover{background:rgba(255,255,255,.12);transform:translateY(-4px);border-color:rgba(127,240,218,.5)}
.ai-card .no{font-size:12px;font-weight:800;letter-spacing:2px;color:#7FF0DA}
.ai-card h3{font-size:20px;margin:10px 0 10px;color:#fff}
.ai-card p{color:rgba(255,255,255,.72);font-size:15px}
.ai-card ul{margin-top:14px;display:grid;gap:7px}
.ai-card li{list-style:none;font-size:14px;color:rgba(255,255,255,.8);padding-left:18px;position:relative}
.ai-card li::before{content:"";position:absolute;left:0;top:9px;width:6px;height:6px;border-radius:50%;background:var(--accent)}
.ai-note{margin-top:26px;text-align:center;font-size:14px;color:rgba(255,255,255,.6)}

/* ============ 产品专区 ============ */
.prod{display:grid;grid-template-columns:1fr 1fr;gap:52px;align-items:center}
.prod-visual{position:relative;border-radius:20px;background:linear-gradient(160deg,#0B5CD5,#072C6B);padding:26px;color:#fff;box-shadow:var(--shadow-lg)}
.prod-visual .pgrid{display:grid;grid-template-columns:repeat(2,1fr);gap:14px}
.pcell{background:rgba(255,255,255,.12);border:1px solid rgba(255,255,255,.2);border-radius:14px;padding:16px}
.pcell b{display:block;font-size:24px}
.pcell span{font-size:13px;color:rgba(255,255,255,.75)}
.prod h2{font-size:32px;line-height:1.3;font-weight:800}
.prod .lead{text-align:left;margin:16px 0 0}
.feat{display:grid;grid-template-columns:1fr 1fr;gap:12px;margin:24px 0 28px}
.feat div{background:var(--soft);border-radius:12px;padding:14px 16px;font-size:15px;font-weight:600;display:flex;gap:10px;align-items:center}
.feat div::before{content:"";width:8px;height:8px;border-radius:50%;background:var(--brand);flex:none}
.tags{display:flex;gap:8px;flex-wrap:wrap;margin-top:18px}
.tags span{background:var(--brand-soft);color:var(--brand);font-size:13px;padding:5px 12px;border-radius:999px}

/* ============ 案例 ============ */
.case{display:grid;grid-template-columns:1fr 1fr;gap:22px}
.case-item{background:#fff;border:1px solid var(--line);border-radius:var(--r);overflow:hidden;transition:.25s}
.case-item:hover{box-shadow:var(--shadow);transform:translateY(-3px)}
.case-cover{height:158px;background:linear-gradient(135deg,#0B5CD5,#00C9A7);position:relative;display:flex;align-items:flex-end;padding:18px}
.case-cover b{position:relative;color:#fff;font-size:17px}
.case-cover::after{content:"";position:absolute;inset:0;background-image:linear-gradient(rgba(255,255,255,.14) 1px,transparent 1px),linear-gradient(90deg,rgba(255,255,255,.14) 1px,transparent 1px);background-size:26px 26px;-webkit-mask-image:linear-gradient(to top,#000,transparent);mask-image:linear-gradient(to top,#000,transparent)}
.case-body{padding:22px}
.case-body p{color:var(--muted);font-size:15px}
.case-body .meta{margin-top:14px;display:flex;gap:8px;flex-wrap:wrap}
.case-body .meta span{font-size:12px;background:var(--soft);color:var(--muted);padding:4px 10px;border-radius:6px}
.logos{display:flex;flex-wrap:wrap;gap:14px;justify-content:center;margin-top:44px;padding-top:36px;border-top:1px solid var(--line)}
.logos div{width:132px;height:66px;background:#fff;border:1px solid var(--line);border-radius:12px;display:flex;align-items:center;justify-content:center;padding:10px;filter:grayscale(1);opacity:.75;transition:.25s}
.logos div:hover{filter:none;opacity:1;box-shadow:var(--shadow)}
.logos img{width:100%;height:100%;object-fit:contain}

/* ============ 优势 / 团队 / 关于 ============ */
.why{display:grid;grid-template-columns:repeat(4,1fr);gap:20px}
.why div{background:#fff;border-radius:var(--r);border:1px solid var(--line);padding:24px}
.why b{display:block;font-size:17px;margin-bottom:8px}
.why span{font-size:14px;color:var(--muted)}
.team{display:grid;grid-template-columns:repeat(3,1fr);gap:20px;margin-top:26px}
.team div{background:#fff;border:1px solid var(--line);border-radius:var(--r);padding:22px}
.team b{display:block;font-size:17px}
.team em{font-style:normal;display:block;color:var(--brand);font-size:13px;margin:4px 0 10px}
.team p{font-size:14px;color:var(--muted)}
.about-intro{max-width:860px;margin:0 auto;text-align:center;color:var(--muted);font-size:16px}
.about-intro b{color:var(--ink)}

/* ============ FAQ ============ */
.faq{max-width:860px;margin:0 auto}
.faq details{background:#fff;border:1px solid var(--line);border-radius:12px;margin-bottom:12px;padding:0}
.faq summary{cursor:pointer;padding:18px 22px;font-weight:600;font-size:16px;list-style:none;display:flex;justify-content:space-between;align-items:center;gap:12px}
.faq summary::-webkit-details-marker{display:none}
.faq summary::after{content:"+";color:var(--brand);font-size:22px;font-weight:700}
.faq details[open] summary::after{content:"–"}
.faq details p{padding:0 22px 18px;color:var(--muted);font-size:15px;border-top:1px solid var(--line);padding-top:14px;margin-top:2px}

/* ============ 联系转化条 ============ */
.cta{background:linear-gradient(135deg,#072C6B,#0B5CD5);color:#fff;text-align:center}
.cta h2{font-size:32px;font-weight:800}
.cta p{margin-top:12px;color:rgba(255,255,255,.82)}
.cta .hero-actions{justify-content:center}

/* ============ 联系表单 ============ */
.contact-grid{display:grid;grid-template-columns:1fr 1fr;gap:48px;align-items:start}
.info-card{background:#fff;border:1px solid var(--line);border-radius:var(--r);padding:28px}
.info-card h3{font-size:18px;margin-bottom:16px}
.info-row{display:flex;gap:12px;padding:12px 0;border-bottom:1px solid var(--line);font-size:15px}
.info-row:last-child{border-bottom:none}
.info-row .k{color:var(--muted);min-width:64px}
.info-row .v{color:var(--ink);font-weight:600}
.form{background:#fff;border:1px solid var(--line);border-radius:var(--r);padding:28px}
.form h3{font-size:18px;margin-bottom:18px}
.field{margin-bottom:16px}
.field label{display:block;font-size:14px;font-weight:600;margin-bottom:6px}
.field input,.field textarea,.field select{width:100%;border:1px solid var(--line);border-radius:10px;padding:11px 14px;font-size:15px;font-family:inherit;color:var(--ink);background:#fff;transition:border-color .2s}
.field input:focus,.field textarea:focus,.field select:focus{outline:none;border-color:var(--brand);box-shadow:0 0 0 3px var(--brand-soft)}
.field textarea{resize:vertical;min-height:110px}
.form .note-mini{font-size:13px;color:var(--muted);margin-top:6px}
.form-ok{display:none;background:#E7F8F2;border:1px solid #9FE6D2;color:#0B6B53;border-radius:10px;padding:14px 16px;font-size:15px;margin-bottom:16px}
.form-ok.show{display:block}
.form-ok.form-err{background:#FEF3F2;border-color:#F5B5AE;color:#8A2C1D}

/* ============ 页脚 ============ */
footer{background:#0A172E;color:#9FB0C9;padding:56px 0 28px;font-size:14px}
footer .fgrid{display:grid;grid-template-columns:1.5fr 1fr 1fr 1.2fr;gap:32px}
footer h5{color:#fff;font-size:15px;margin-bottom:14px}
footer a{display:block;padding:4px 0;color:#9FB0C9}
footer a:hover{color:#fff}
footer .fbot{margin-top:40px;padding-top:20px;border-top:1px solid rgba(255,255,255,.12);display:flex;justify-content:space-between;gap:12px;flex-wrap:wrap;font-size:13px}

/* skip link 无障碍 */
.skip{position:absolute;left:-9999px;top:0;background:var(--brand);color:#fff;padding:10px 16px;z-index:99;border-radius:0 0 10px 0}
.skip:focus{left:0}

/* ============ 工具类（替代内联样式，配合严格 CSP） ============ */
.t-center{margin-top:40px;text-align:center}
.t-center-sm{margin-top:36px;text-align:center}
.t-mt-16{margin-top:16px}
.t-mt-18{margin-top:18px}
.t-mt-24{margin-top:24px}
.t-mt-34{margin-top:34px}
.t-mt-40{margin-top:40px}
.t-block{display:block;padding:4px 0}
.c-accent{color:#7FF0DA}
.c-accent-warm{color:#FFC79A}
.dot-ok{background:#00C9A7}
.dot-warn{background:#FF8A3D}

/* 产品/平台视觉卡内部元素 */
.visual-head{display:flex;justify-content:space-between;align-items:center;margin-bottom:16px}
.visual-title{font-size:17px}
.visual-domain{font-size:12px;color:#7FF0DA}
.visual-note{margin-top:14px;background:rgba(255,255,255,.1);border-radius:14px;padding:14px;font-size:13px;color:rgba(255,255,255,.8)}

/* 案例列表变体 */
.case-wide{max-width:920px;margin:0 auto 22px}
.case-wide:last-of-type{margin-bottom:0}
.case-cover.tall{height:180px}
.case-cover.alt{background:linear-gradient(135deg,#00C9A7,#0B5CD5)}

/* 提示框 / 整宽按钮 */
.tip-box{margin-top:18px;background:var(--soft);border-radius:12px;padding:16px;font-size:14px;color:var(--muted)}
.btn-block{width:100%;justify-content:center}

/* ============ 响应式 ============ */
@media(max-width:1024px){
  .nav{display:none;position:absolute;top:68px;left:0;right:0;background:#fff;flex-direction:column;gap:0;padding:8px 24px 16px;border-bottom:1px solid var(--line);box-shadow:0 10px 20px rgba(0,0,0,.06)}
  .nav.open{display:flex}
  .nav a{padding:12px 10px;border-radius:8px;font-size:16px}
  .nav a.on{background:var(--brand-soft);color:#083F9E}
  .nav a.on::after{display:none}
  .burger{display:flex}
  .hero .wrap{grid-template-columns:1fr;gap:36px;padding-top:52px;padding-bottom:52px}
  .hero h1{font-size:34px}
  .prod,.case,.contact-grid{grid-template-columns:1fr;gap:32px}
  .grid3,.why,.team,.ai-grid{grid-template-columns:repeat(2,1fr)}
  .stats{gap:26px}
  footer .fgrid{grid-template-columns:1fr 1fr}
}
@media(max-width:640px){
  .wrap{padding:0 18px}
  section{padding:56px 0}
  .page-hero{padding:48px 0 40px}
  .page-hero h1{font-size:27px}
  .hero h1{font-size:27px}
  .hero .sub{font-size:15px}
  .sec-head h2,.prod h2,.cta h2{font-size:25px}
  .grid3,.why,.team,.ai-grid,.feat,.kpis{grid-template-columns:1fr}
  .stats{gap:18px 26px}
  .stats b{font-size:24px}
  .logos div{width:calc(50% - 7px)}
  footer .fgrid{grid-template-columns:1fr}
  .hdr-cta .btn-ghost{display:none}
}