/* ============================================================
   安信恒物联科技 · 公司业务宣传网站
   样式表 v1.0
   ============================================================ */
:root{
  --brand:#0ea5a4;            /* 主品牌色 青绿 */
  --brand-dark:#0c8483;
  --brand2:#2563eb;           /* 辅助蓝 */
  --brand2-dark:#1d4ed8;
  --good:#16a34a;             /* 节能绿 */
  --warn:#f59e0b;             /* 热水橙 */
  --ink:#0f172a;
  --ink2:#1e293b;
  --muted:#64748b;
  --muted2:#94a3b8;
  --line:#e2e8f0;
  --soft:#f1f5f9;
  --soft2:#f8fafc;
  --white:#ffffff;
  --radius:16px;
  --radius-sm:10px;
  --shadow-sm:0 1px 3px rgba(15,23,42,.08),0 1px 2px rgba(15,23,42,.04);
  --shadow:0 10px 30px rgba(15,23,42,.08);
  --shadow-lg:0 24px 60px rgba(15,23,42,.14);
  --grad:linear-gradient(135deg,#0ea5a4 0%,#2563eb 100%);
  --grad-soft:linear-gradient(135deg,rgba(14,165,164,.10),rgba(37,99,235,.10));
  --maxw:1200px;
  --nav-h:68px;
}

*{box-sizing:border-box;}
html{scroll-behavior:smooth;scroll-padding-top:var(--nav-h);}
body{
  margin:0;
  font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Microsoft YaHei",sans-serif;
  color:var(--ink);
  background:var(--white);
  line-height:1.7;
  -webkit-font-smoothing:antialiased;
}
a{color:inherit;text-decoration:none;}
img{max-width:100%;display:block;}
h1,h2,h3,h4{line-height:1.25;margin:0;color:var(--ink);}
p{margin:0;}
.container{max-width:var(--maxw);margin:0 auto;padding:0 24px;}
.muted{color:var(--muted);}

/* ---------- 通用按钮 ---------- */
.btn{
  display:inline-flex;align-items:center;gap:8px;
  padding:12px 22px;border-radius:999px;font-size:15px;font-weight:600;
  cursor:pointer;border:1px solid transparent;transition:.2s;white-space:nowrap;
}
.btn-primary{background:var(--grad);color:#fff;box-shadow:0 8px 20px rgba(14,165,164,.30);}
.btn-primary:hover{filter:brightness(1.05);transform:translateY(-1px);}
.btn-ghost{background:#fff;color:var(--ink);border-color:var(--line);}
.btn-ghost:hover{border-color:var(--brand);color:var(--brand);}
.btn-light{background:rgba(255,255,255,.15);color:#fff;border-color:rgba(255,255,255,.4);}
.btn-light:hover{background:rgba(255,255,255,.25);}

/* ---------- 顶部导航 ---------- */
.nav{
  position:fixed;top:0;left:0;right:0;height:var(--nav-h);z-index:1000;
  background:rgba(255,255,255,.82);backdrop-filter:saturate(180%) blur(14px);
  border-bottom:1px solid var(--line);transition:.3s;
}
.nav.scrolled{box-shadow:var(--shadow-sm);}
.nav-inner{max-width:var(--maxw);margin:0 auto;height:100%;padding:0 24px;
  display:flex;align-items:center;justify-content:space-between;}
.logo{display:flex;align-items:center;gap:10px;font-weight:800;font-size:18px;color:var(--ink);}
.logo .mark{
  width:34px;height:34px;border-radius:9px;background:var(--grad);
  display:flex;align-items:center;justify-content:center;color:#fff;font-weight:800;font-size:15px;
  box-shadow:0 6px 14px rgba(14,165,164,.35);
}
.logo small{display:block;font-size:11px;font-weight:500;color:var(--muted);letter-spacing:.5px;}
.nav-menu{display:flex;align-items:center;gap:4px;}
.nav-menu a{
  padding:8px 14px;border-radius:8px;font-size:14.5px;font-weight:500;color:var(--ink2);transition:.15s;
}
.nav-menu a:hover{background:var(--soft);color:var(--brand);}
.nav-cta{margin-left:8px;}
.nav-toggle{display:none;background:none;border:0;cursor:pointer;padding:8px;}
.nav-toggle span{display:block;width:22px;height:2px;background:var(--ink);margin:4px 0;border-radius:2px;}

/* ---------- Hero ---------- */
.hero{position:relative;padding:calc(var(--nav-h) + 70px) 0 90px;overflow:hidden;}
.hero-bg{
  position:absolute;inset:0;z-index:0;
  background:
    radial-gradient(1200px 500px at 85% -10%,rgba(37,99,235,.18),transparent 60%),
    radial-gradient(900px 500px at 5% 10%,rgba(14,165,164,.16),transparent 55%),
    linear-gradient(180deg,#f8fafc 0%,#ffffff 100%);
}
.hero-grid{position:relative;z-index:1;display:grid;grid-template-columns:1.15fr .85fr;gap:48px;align-items:center;}
.hero .badge{
  display:inline-flex;align-items:center;gap:8px;background:#fff;border:1px solid var(--line);
  color:var(--brand-dark);font-weight:600;font-size:13px;padding:7px 14px;border-radius:999px;box-shadow:var(--shadow-sm);
}
.hero h1{font-size:44px;font-weight:800;letter-spacing:-.5px;margin:18px 0 14px;}
.hero h1 .hl{background:var(--grad);-webkit-background-clip:text;background-clip:text;color:transparent;}
.hero p.lead{font-size:17px;color:var(--muted);max-width:560px;margin-bottom:26px;}
.hero-actions{display:flex;gap:12px;flex-wrap:wrap;margin-bottom:34px;}
.hero-stats{display:flex;gap:26px;flex-wrap:wrap;}
.hero-stats .s b{font-size:26px;font-weight:800;color:var(--ink);display:block;}
.hero-stats .s span{font-size:13px;color:var(--muted);}
.hero-card{
  background:#fff;border:1px solid var(--line);border-radius:20px;padding:26px;box-shadow:var(--shadow-lg);
  position:relative;overflow:hidden;
}
.hero-card::before{content:"";position:absolute;inset:0;background:var(--grad-soft);opacity:.7;z-index:0;}
.hero-card>*{position:relative;z-index:1;}
.hero-card h3{font-size:16px;margin-bottom:14px;display:flex;align-items:center;gap:8px;}
.mini-metric{display:flex;justify-content:space-between;align-items:center;padding:12px 0;border-bottom:1px dashed var(--line);}
.mini-metric:last-child{border-bottom:0;}
.mini-metric .k{font-size:13.5px;color:var(--muted);}
.mini-metric .v{font-size:18px;font-weight:800;color:var(--good);}
.hero-card .src{font-size:11px;color:var(--muted2);margin-top:12px;}

/* ---------- Section 通用 ---------- */
section{padding:84px 0;}
.section-head{text-align:center;max-width:760px;margin:0 auto 52px;}
.section-head .eyebrow{
  display:inline-block;font-size:13px;font-weight:700;letter-spacing:1.5px;text-transform:uppercase;
  color:var(--brand);margin-bottom:12px;
}
.section-head h2{font-size:34px;font-weight:800;letter-spacing:-.5px;}
.section-head p{margin-top:14px;color:var(--muted);font-size:16px;}
.bg-soft{background:var(--soft2);}
.bg-grad{background:linear-gradient(180deg,#f8fafc,#eef6f6);}

/* ---------- 关于 ---------- */
.about-grid{display:grid;grid-template-columns:1fr 1fr;gap:48px;align-items:center;}
.about-text p{color:var(--muted);margin-bottom:16px;font-size:15.5px;}
.about-text .taglist{display:flex;flex-wrap:wrap;gap:8px;margin-top:18px;}
.about-text .tag{background:var(--soft);border:1px solid var(--line);border-radius:999px;padding:6px 14px;font-size:13px;color:var(--ink2);font-weight:500;}
.about-cards{display:grid;grid-template-columns:1fr 1fr;gap:16px;}
.fact-card{background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:22px;box-shadow:var(--shadow-sm);}
.fact-card .ic{width:42px;height:42px;border-radius:11px;background:var(--grad-soft);display:flex;align-items:center;justify-content:center;margin-bottom:12px;color:var(--brand);}
.fact-card b{font-size:22px;display:block;}
.fact-card span{font-size:13px;color:var(--muted);}

/* ---------- 业务板块 ---------- */
.svc-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:22px;}
.svc-card{
  background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:28px 26px;
  box-shadow:var(--shadow-sm);transition:.25s;position:relative;overflow:hidden;
}
.svc-card::after{content:"";position:absolute;left:0;top:0;height:3px;width:0;background:var(--grad);transition:.3s;}
.svc-card:hover{transform:translateY(-5px);box-shadow:var(--shadow-lg);}
.svc-card:hover::after{width:100%;}
.svc-ic{
  width:54px;height:54px;border-radius:14px;background:var(--grad);color:#fff;
  display:flex;align-items:center;justify-content:center;margin-bottom:18px;box-shadow:0 10px 20px rgba(14,165,164,.3);
}
.svc-card h3{font-size:19px;margin-bottom:10px;}
.svc-card p{font-size:14px;color:var(--muted);margin-bottom:14px;}
.svc-card ul{list-style:none;padding:0;margin:0;display:flex;flex-direction:column;gap:7px;}
.svc-card ul li{font-size:13.5px;color:var(--ink2);display:flex;gap:8px;align-items:flex-start;}
.svc-card ul li svg{flex:0 0 auto;margin-top:3px;color:var(--brand);}

/* ---------- AI 节能 ---------- */
.ai-grid{display:grid;grid-template-columns:1fr 1fr;gap:40px;align-items:center;margin-bottom:48px;}
.ai-text h2{font-size:30px;font-weight:800;margin-bottom:16px;}
.ai-text p{color:var(--muted);margin-bottom:16px;font-size:15.5px;}
.ai-points{display:flex;flex-direction:column;gap:14px;margin-top:8px;}
.ai-point{display:flex;gap:12px;align-items:flex-start;}
.ai-point .num{
  flex:0 0 auto;width:30px;height:30px;border-radius:9px;background:var(--grad);color:#fff;
  display:flex;align-items:center;justify-content:center;font-weight:800;font-size:14px;
}
.ai-point b{display:block;font-size:15px;margin-bottom:2px;}
.ai-point span{font-size:13.5px;color:var(--muted);}
.ai-visual{background:#0f172a;border-radius:22px;padding:30px;color:#fff;box-shadow:var(--shadow-lg);position:relative;overflow:hidden;}
.ai-visual::before{content:"";position:absolute;inset:0;background:radial-gradient(600px 300px at 90% 0%,rgba(37,99,235,.35),transparent 60%);}
.ai-visual>*{position:relative;z-index:1;}
.ai-visual .vt{font-size:13px;color:#94a3b8;letter-spacing:1px;text-transform:uppercase;margin-bottom:16px;}
.flow-row{display:flex;align-items:center;gap:10px;margin:10px 0;}
.flow-node{flex:1;background:rgba(255,255,255,.07);border:1px solid rgba(255,255,255,.12);border-radius:12px;padding:12px 14px;}
.flow-node b{font-size:14px;display:block;}
.flow-node span{font-size:11.5px;color:#94a3b8;}
.flow-arrow{color:var(--brand);font-size:20px;flex:0 0 auto;}

/* 架构图 */
.arch-wrap{background:var(--soft2);border:1px solid var(--line);border-radius:var(--radius);padding:30px;margin-top:8px;}
.arch-layer{
  display:grid;grid-template-columns:170px 1fr;gap:18px;align-items:center;
  background:#fff;border:1px solid var(--line);border-radius:14px;padding:18px 22px;margin-bottom:12px;
}
.arch-layer:last-child{margin-bottom:0;}
.arch-layer .lvl{font-weight:800;font-size:15px;}
.arch-layer .lvl small{display:block;font-weight:500;font-size:12px;color:var(--muted);}
.arch-boxes{display:flex;flex-wrap:wrap;gap:10px;}
.arch-box{background:var(--soft);border:1px solid var(--line);border-radius:10px;padding:9px 14px;font-size:13px;color:var(--ink2);font-weight:500;}
.arch-box.b1{background:rgba(14,165,164,.10);border-color:rgba(14,165,164,.3);color:var(--brand-dark);}
.arch-box.b2{background:rgba(37,99,235,.10);border-color:rgba(37,99,235,.3);color:var(--brand2-dark);}
.arch-link{text-align:center;color:var(--muted2);font-size:12px;margin:2px 0;}

/* ROI 计算器 */
.roi{
  background:#fff;border:1px solid var(--line);border-radius:22px;box-shadow:var(--shadow);
  overflow:hidden;margin-top:48px;
}
.roi-head{background:var(--grad);color:#fff;padding:22px 28px;display:flex;align-items:center;justify-content:space-between;flex-wrap:wrap;gap:10px;}
.roi-head h3{color:#fff;font-size:20px;display:flex;align-items:center;gap:10px;}
.roi-head p{font-size:13px;color:#d1fae5;margin:0;}
.roi-body{display:grid;grid-template-columns:380px 1fr;gap:0;}
.roi-inputs{padding:26px;border-right:1px solid var(--line);background:var(--soft2);}
.roi-result{padding:26px;}
.roi-inputs label{display:block;font-size:12.5px;color:var(--muted);margin:14px 0 5px;font-weight:600;}
.roi-inputs input[type=text],.roi-inputs input[type=number]{
  width:100%;padding:10px 12px;border:1px solid var(--line);border-radius:9px;font-size:14px;color:var(--ink);background:#fff;
}
.roi-inputs input:focus{outline:none;border-color:var(--brand);box-shadow:0 0 0 3px rgba(14,165,164,.15);}
.roi-row2{display:grid;grid-template-columns:1fr 1fr;gap:12px;}
.rate-val{font-size:22px;font-weight:800;color:var(--brand);}
.roi-inputs input[type=range]{width:100%;accent-color:var(--brand);margin-top:6px;}
.modes{display:flex;gap:8px;margin-top:6px;}
.modes label{flex:1;margin:0;border:1px solid var(--line);border-radius:10px;padding:10px;cursor:pointer;text-align:center;font-size:13px;color:var(--ink);background:#fff;font-weight:600;transition:.15s;}
.modes input{display:none;}
.modes label.active{border-color:var(--brand);background:rgba(14,165,164,.08);color:var(--brand);}
.roi-btn{width:100%;margin-top:18px;background:var(--grad);color:#fff;border:0;border-radius:10px;padding:13px;font-size:15px;font-weight:700;cursor:pointer;transition:.2s;}
.roi-btn:hover{filter:brightness(1.05);}
.preset{font-size:12px;color:var(--brand2);background:none;border:0;cursor:pointer;text-decoration:underline;padding:10px 0 0;display:block;}
.metrics{display:grid;grid-template-columns:1fr 1fr;gap:12px;}
.metric{background:var(--soft);border-radius:12px;padding:14px 16px;}
.metric .k{font-size:12px;color:var(--muted);margin-bottom:6px;}
.metric .v{font-size:21px;font-weight:800;}
.metric .v small{font-size:12px;font-weight:500;color:var(--muted);}
.metric.hl{background:var(--grad);color:#fff;}
.metric.hl .k{color:#d1fae5;}
.metric.hl .v small{color:#e0f2fe;}
.roi-note{font-size:11.5px;color:var(--muted);margin-top:16px;line-height:1.6;border-top:1px dashed var(--line);padding-top:12px;}

/* ---------- 合作模式 ---------- */
.model-grid{display:grid;grid-template-columns:1fr 1fr;gap:26px;}
.model-card{border:1px solid var(--line);border-radius:var(--radius);padding:30px;background:#fff;box-shadow:var(--shadow-sm);position:relative;}
.model-card.feature{border-color:var(--brand);box-shadow:0 16px 40px rgba(14,165,164,.18);}
.model-card .ribbon{position:absolute;top:-12px;left:30px;background:var(--grad);color:#fff;font-size:12px;font-weight:700;padding:5px 14px;border-radius:999px;}
.model-card h3{font-size:21px;margin-bottom:6px;}
.model-card .sub{font-size:13.5px;color:var(--muted);margin-bottom:18px;}
.model-card ul{list-style:none;padding:0;margin:0 0 18px;display:flex;flex-direction:column;gap:11px;}
.model-card ul li{font-size:14px;color:var(--ink2);display:flex;gap:10px;align:flex-start;}
.model-card ul li svg{flex:0 0 auto;margin-top:3px;color:var(--brand);}
.model-card .price{font-size:13px;color:var(--muted);}
.model-card .price b{font-size:20px;color:var(--ink);}

/* ---------- 案例 ---------- */
.filter{display:flex;flex-wrap:wrap;gap:10px;justify-content:center;margin-bottom:36px;}
.filter button{
  border:1px solid var(--line);background:#fff;color:var(--ink2);font-size:14px;font-weight:600;
  padding:9px 18px;border-radius:999px;cursor:pointer;transition:.18s;
}
.filter button.active{background:var(--grad);color:#fff;border-color:transparent;box-shadow:0 8px 18px rgba(14,165,164,.25);}
.filter button:hover{border-color:var(--brand);color:var(--brand);}
.filter button.active:hover{color:#fff;}
.cases{display:grid;grid-template-columns:repeat(3,1fr);gap:22px;}
.case{
  background:#fff;border:1px solid var(--line);border-radius:var(--radius);overflow:hidden;
  box-shadow:var(--shadow-sm);transition:.25s;display:flex;flex-direction:column;
}
.case:hover{transform:translateY(-5px);box-shadow:var(--shadow-lg);}
.case .thumb{height:150px;background:var(--grad-soft);position:relative;display:flex;align-items:center;justify-content:center;color:var(--brand);}
.case .thumb svg{opacity:.55;}
.case .thumb .tag{position:absolute;top:12px;left:12px;background:rgba(15,23,42,.78);color:#fff;font-size:11.5px;font-weight:600;padding:4px 10px;border-radius:999px;}
.case .body{padding:20px;flex:1;display:flex;flex-direction:column;}
.case .body h3{font-size:17px;margin-bottom:8px;line-height:1.4;}
.case .body p{font-size:13.5px;color:var(--muted);margin-bottom:14px;flex:1;}
.case .meta{display:flex;flex-wrap:wrap;gap:8px;}
.case .chip{font-size:11.5px;background:var(--soft);color:var(--ink2);border:1px solid var(--line);border-radius:6px;padding:3px 9px;}
.case.hide{display:none;}

/* 业绩统计 */
.stats{display:grid;grid-template-columns:repeat(5,1fr);gap:18px;margin-top:10px;}
.stat{text-align:center;padding:26px 14px;border-radius:var(--radius);background:#fff;border:1px solid var(--line);box-shadow:var(--shadow-sm);}
.stat b{font-size:38px;font-weight:800;background:var(--grad);-webkit-background-clip:text;background-clip:text;color:transparent;display:block;line-height:1;}
.stat span{font-size:13.5px;color:var(--muted);margin-top:8px;display:block;}

/* ---------- 联系 ---------- */
.contact-grid{display:grid;grid-template-columns:1fr 1fr;gap:40px;align-items:start;}
.contact-info h2{font-size:30px;font-weight:800;margin-bottom:14px;}
.contact-info p{color:var(--muted);margin-bottom:24px;}
.contact-list{display:flex;flex-direction:column;gap:16px;}
.contact-item{display:flex;gap:14px;align-items:flex-start;background:#fff;border:1px solid var(--line);border-radius:14px;padding:16px 18px;}
.contact-item .ic{width:42px;height:42px;border-radius:11px;background:var(--grad-soft);color:var(--brand);display:flex;align-items:center;justify-content:center;flex:0 0 auto;}
.contact-item b{display:block;font-size:15px;}
.contact-item span{font-size:13.5px;color:var(--muted);}
.contact-form{background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:30px;box-shadow:var(--shadow);}
.contact-form h3{font-size:18px;margin-bottom:18px;}
.contact-form .field{margin-bottom:16px;}
.contact-form label{display:block;font-size:13px;color:var(--muted);font-weight:600;margin-bottom:6px;}
.contact-form input,.contact-form textarea{
  width:100%;padding:11px 13px;border:1px solid var(--line);border-radius:9px;font-size:14px;
  font-family:inherit;color:var(--ink);background:var(--soft2);
}
.contact-form input:focus,.contact-form textarea:focus{outline:none;border-color:var(--brand);box-shadow:0 0 0 3px rgba(14,165,164,.15);background:#fff;}
.contact-form textarea{resize:vertical;min-height:90px;}
.contact-form .hint{font-size:12px;color:var(--muted2);margin-top:10px;}

/* ---------- 页脚 ---------- */
.footer{background:var(--ink);color:#cbd5e1;padding:56px 0 28px;font-size:14px;}
.footer-grid{display:grid;grid-template-columns:1.4fr 1fr 1fr 1.2fr;gap:34px;margin-bottom:36px;}
.footer .logo{color:#fff;margin-bottom:14px;}
.footer .logo small{color:#94a3b8;}
.footer p.desc{color:#94a3b8;font-size:13.5px;max-width:300px;}
.footer h4{color:#fff;font-size:15px;margin-bottom:16px;}
.footer ul{list-style:none;padding:0;margin:0;display:flex;flex-direction:column;gap:10px;}
.footer ul a{color:#cbd5e1;font-size:13.5px;transition:.15s;}
.footer ul a:hover{color:#fff;padding-left:4px;}
.footer .f-contact li{display:flex;gap:10px;align-items:flex-start;color:#94a3b8;font-size:13.5px;}
.footer .f-contact svg{color:var(--brand);flex:0 0 auto;margin-top:3px;}
.footer-bottom{border-top:1px solid rgba(255,255,255,.1);padding-top:22px;display:flex;justify-content:space-between;flex-wrap:wrap;gap:10px;color:#94a3b8;font-size:12.5px;}

/* ---------- 滚动揭示动画 ---------- */
.reveal{opacity:0;transform:translateY(28px);transition:.6s cubic-bezier(.2,.7,.2,1);}
.reveal.in{opacity:1;transform:none;}

/* ---------- 响应式 ---------- */
@media(max-width:980px){
  .hero-grid{grid-template-columns:1fr;gap:36px;}
  .hero h1{font-size:36px;}
  .about-grid,.ai-grid,.model-grid,.contact-grid,.roi-body{grid-template-columns:1fr;}
  .roi-inputs{border-right:0;border-bottom:1px solid var(--line);}
  .svc-grid,.cases{grid-template-columns:repeat(2,1fr);}
  .stats{grid-template-columns:repeat(3,1fr);}
  .footer-grid{grid-template-columns:1fr 1fr;}
  .nav-menu{
    position:absolute;top:var(--nav-h);left:0;right:0;background:#fff;border-bottom:1px solid var(--line);
    flex-direction:column;align-items:stretch;padding:12px;gap:2px;display:none;box-shadow:var(--shadow);
  }
  .nav-menu.open{display:flex;}
  .nav-menu a{padding:12px 14px;}
  .nav-cta{margin:8px 0 0;}
  .nav-toggle{display:block;}
}
@media(max-width:620px){
  section{padding:60px 0;}
  .hero h1{font-size:30px;}
  .section-head h2{font-size:27px;}
  .svc-grid,.cases{grid-template-columns:1fr;}
  .stats{grid-template-columns:repeat(2,1fr);}
  .about-cards{grid-template-columns:1fr;}
  .footer-grid{grid-template-columns:1fr;}
  .metrics{grid-template-columns:1fr;}
  .arch-layer{grid-template-columns:1fr;}
  .container{padding:0 18px;}
}