/* ==========================================================================
   翼冻智冷云枢 ColdIoT — 企业官网统一样式 v2
   配色：深蓝 #0A3D6B / 冰蓝 #4FC3F7 / 橙 #FF6D00
   ========================================================================== */
:root{
  --ink:#0A3D6B;          /* 主深蓝 */
  --ink-2:#0d4f87;
  --ink-3:#1565C0;        /* 蓝 */
  --ice:#4FC3F7;          /* 冰蓝辅色 */
  --ice-soft:#e3f4fd;
  --accent:#FF6D00;       /* 强调橙（CTA/核心数据） */
  --accent-2:#ff8a33;
  --bg:#FFFFFF;
  --bg-soft:#F5F7FA;      /* 浅灰背景 */
  --bg-deep:#07223f;      /* 深底 */
  --text:#1A1A1A;
  --muted:#666666;
  --line:#e6ecf2;
  --radius:14px;
  --radius-lg:22px;
  --shadow:0 6px 22px rgba(10,61,107,.08);
  --shadow-lg:0 16px 44px rgba(10,61,107,.14);
  --maxw:1200px;
  --grad-hero:linear-gradient(135deg,#07223f 0%,#0A3D6B 48%,#1565C0 100%);
  --grad-accent:linear-gradient(135deg,var(--accent),var(--accent-2));
  --font:"PingFang SC","Microsoft YaHei",system-ui,-apple-system,"Segoe UI",Roboto,"Helvetica Neue",Arial,sans-serif;
}
*,*::before,*::after{box-sizing:border-box;}
html{scroll-behavior:smooth;}
body{margin:0;font-family:var(--font);color:var(--text);background:var(--bg);
  font-size:16px;line-height:1.75;-webkit-font-smoothing:antialiased;}
img{max-width:100%;display:block;}
a{color:inherit;text-decoration:none;}
h1,h2,h3,h4{line-height:1.3;margin:0;font-weight:800;letter-spacing:.01em;}
p{margin:0;}
ul{margin:0;padding:0;list-style:none;}
.container{width:min(100% - 40px,var(--maxw));margin-inline:auto;}
.mono{font-family:"SFMono-Regular",Consolas,Menlo,monospace;}
.text-accent{color:var(--accent);}
.text-ice{color:var(--ice);}

/* ---------- Header ---------- */
.hdr{position:sticky;top:0;z-index:100;background:rgba(255,255,255,.92);
  backdrop-filter:blur(10px);border-bottom:1px solid var(--line);}
.hdr-in{display:flex;align-items:center;gap:26px;height:70px;}
.logo{display:flex;align-items:center;gap:11px;flex-shrink:0;}
.logo-mark{width:40px;height:40px;border-radius:11px;display:grid;place-items:center;
  background:linear-gradient(135deg,var(--ice),var(--ink-3));color:#fff;font-weight:800;
  font-size:15px;letter-spacing:-.5px;box-shadow:0 5px 14px rgba(79,195,247,.4);}
.logo-txt strong{display:block;font-size:16px;letter-spacing:.02em;color:var(--ink);}
.logo-txt span{display:block;font-size:11px;color:var(--muted);letter-spacing:.14em;text-transform:uppercase;}
.nav{display:flex;gap:2px;margin-left:auto;align-items:center;}
.nav a{padding:9px 14px;border-radius:9px;font-size:15px;color:var(--ink);transition:.18s;font-weight:500;}
.nav a:hover{color:var(--ink-3);background:var(--bg-soft);}
.nav a.active{color:var(--ink-3);font-weight:700;}
.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;padding:12px 24px;
  border-radius:11px;font-size:15px;font-weight:700;transition:.2s;border:1px solid transparent;cursor:pointer;white-space:nowrap;}
.btn-primary{background:var(--grad-accent);color:#fff;box-shadow:0 7px 20px rgba(255,109,0,.32);}
.btn-primary:hover{transform:translateY(-2px);box-shadow:0 11px 28px rgba(255,109,0,.42);}
.btn-ghost{border-color:var(--line);color:var(--ink);background:#fff;}
.btn-ghost:hover{border-color:var(--ink-3);color:var(--ink-3);}
.btn-light{background:rgba(255,255,255,.14);color:#fff;border-color:rgba(255,255,255,.35);}
.btn-light:hover{background:rgba(255,255,255,.24);}
.btn-outline-light{border:1px solid rgba(255,255,255,.55);color:#fff;background:transparent;}
.btn-outline-light:hover{background:rgba(255,255,255,.16);}
.burger{display:none;margin-left:auto;width:44px;height:44px;border:1px solid var(--line);
  border-radius:11px;background:#fff;cursor:pointer;padding:0;flex-direction:column;gap:5px;align-items:center;justify-content:center;}
.burger i{display:block;width:19px;height:2px;background:var(--ink);border-radius:2px;transition:.2s;}

/* ---------- Hero ---------- */
.hero{background:var(--grad-hero);color:#fff;position:relative;overflow:hidden;}
.hero::after{content:"";position:absolute;inset:0;
  background:radial-gradient(720px 380px at 84% 16%,rgba(79,195,247,.30),transparent 62%),
            radial-gradient(560px 340px at 10% 90%,rgba(79,195,247,.22),transparent 60%);pointer-events:none;}
.hero-in{position:relative;z-index:1;padding:96px 0 86px;display:grid;grid-template-columns:1.12fr .88fr;gap:54px;align-items:center;}
.tag{display:inline-flex;align-items:center;gap:8px;padding:6px 15px;border-radius:999px;
  background:rgba(255,255,255,.12);border:1px solid rgba(255,255,255,.28);font-size:13px;letter-spacing:.05em;}
.hero h1{font-size:48px;margin:22px 0 18px;font-weight:800;line-height:1.18;}
.hero h1 em{font-style:normal;background:linear-gradient(90deg,#7fe0ff,var(--ice));
  -webkit-background-clip:text;background-clip:text;color:transparent;}
.hero-lead{font-size:18px;color:#cfe6f7;max-width:560px;margin-bottom:28px;}
.hero-cta{display:flex;gap:14px;flex-wrap:wrap;}
.hero-stats{display:grid;grid-template-columns:repeat(3,1fr);gap:16px;margin-top:40px;
  border-top:1px solid rgba(255,255,255,.16);padding-top:26px;}
.hstat b{display:block;font-size:30px;color:#fff;font-weight:800;}
.hstat b span{color:var(--ice);}
.hstat small{color:#bcd6ea;font-size:13px;}
.hero-card{background:rgba(255,255,255,.08);border:1px solid rgba(255,255,255,.2);border-radius:var(--radius-lg);
  padding:26px;backdrop-filter:blur(4px);}
.hero-card h4{font-size:15px;color:var(--ice);margin-bottom:14px;letter-spacing:.05em;}
.hero-card ul li{display:flex;gap:10px;padding:9px 0;border-bottom:1px solid rgba(255,255,255,.1);font-size:14.5px;color:#e7f2fa;}
.hero-card ul li:last-child{border-bottom:0;}
.hero-card ul li::before{content:"✓";color:var(--ice);font-weight:800;}

/* ---------- 通用区块 ---------- */
.section{padding:78px 0;}
.section.soft{background:var(--bg-soft);}
.section-head{text-align:center;max-width:760px;margin:0 auto 46px;}
.section-head .eyebrow{display:inline-block;font-size:13px;letter-spacing:.14em;text-transform:uppercase;
  color:var(--ink-3);font-weight:700;margin-bottom:12px;}
.section-head h2{font-size:34px;color:var(--ink);}
.section-head p{margin-top:14px;color:var(--muted);font-size:16px;}

/* ---------- 信任背书条 ---------- */
.trustbar{background:var(--bg-deep);color:#fff;}
.trustbar-in{display:flex;flex-wrap:wrap;justify-content:center;gap:14px 40px;padding:22px 0;align-items:center;}
.trustbar .t-item{display:flex;align-items:center;gap:10px;font-size:14.5px;color:#cfe0ee;}
.trustbar .t-item b{color:#fff;font-weight:700;}
.trustbar .t-item .dot{width:7px;height:7px;border-radius:50%;background:var(--ice);}

/* ---------- 痛点卡片 ---------- */
.pain-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:22px;}
.pain{background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:30px;box-shadow:var(--shadow);}
.pain .num{font-size:46px;font-weight:800;color:var(--accent);line-height:1;}
.pain h3{margin:14px 0 8px;font-size:19px;color:var(--ink);}
.pain p{color:var(--muted);font-size:15px;}

/* ---------- 三栏方案 ---------- */
.sol-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:24px;}
.sol-card{background:#fff;border:1px solid var(--line);border-radius:var(--radius-lg);padding:34px;
  box-shadow:var(--shadow);transition:.22s;position:relative;overflow:hidden;}
.sol-card::before{content:"";position:absolute;left:0;top:0;width:100%;height:4px;background:var(--grad-accent);transform:scaleX(0);transform-origin:left;transition:.25s;}
.sol-card:hover{transform:translateY(-6px);box-shadow:var(--shadow-lg);}
.sol-card:hover::before{transform:scaleX(1);}
.sol-ico{width:58px;height:58px;border-radius:15px;display:grid;place-items:center;font-size:26px;
  background:var(--ice-soft);color:var(--ink-3);margin-bottom:18px;}
.sol-card h3{font-size:21px;color:var(--ink);margin-bottom:10px;}
.sol-card p{color:var(--muted);font-size:15px;margin-bottom:16px;}
.sol-card .more{color:var(--ink-3);font-weight:700;font-size:14.5px;}

/* ---------- 产品卡 ---------- */
.prod-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:24px;}
.prod-card{background:#fff;border:1px solid var(--line);border-radius:var(--radius-lg);overflow:hidden;
  box-shadow:var(--shadow);transition:.22s;display:flex;flex-direction:column;}
.prod-card:hover{transform:translateY(-6px);box-shadow:var(--shadow-lg);}
.prod-thumb{height:170px;background:var(--grad-hero);display:grid;place-items:center;color:#fff;font-size:54px;}
.prod-body{padding:26px;flex:1;display:flex;flex-direction:column;}
.prod-body h3{font-size:20px;color:var(--ink);margin-bottom:8px;}
.prod-body p{color:var(--muted);font-size:14.5px;margin-bottom:16px;flex:1;}
.prod-tags{display:flex;flex-wrap:wrap;gap:8px;margin-bottom:16px;}
.prod-tags span{font-size:12.5px;background:var(--ice-soft);color:var(--ink-3);padding:4px 11px;border-radius:999px;font-weight:600;}

/* ---------- 案例 ---------- */
.case-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:20px;}
.case-card{background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:26px;box-shadow:var(--shadow);transition:.2s;}
.case-card:hover{transform:translateY(-5px);box-shadow:var(--shadow-lg);}
.case-card .save{font-size:34px;font-weight:800;color:var(--accent);}
.case-card .save small{font-size:15px;color:var(--accent);}
.case-card .rate{display:inline-block;margin-top:8px;font-size:13px;background:#fff3e9;color:var(--accent);
  padding:3px 10px;border-radius:999px;font-weight:700;}
.case-card h4{margin:14px 0 4px;font-size:17px;color:var(--ink);}
.case-card .type{color:var(--muted);font-size:13.5px;}
.case-total{margin-top:34px;background:var(--grad-hero);color:#fff;border-radius:var(--radius-lg);
  padding:30px 36px;display:flex;justify-content:space-between;align-items:center;flex-wrap:wrap;gap:14px;}
.case-total b{font-size:38px;}
.case-total span{color:#cfe6f7;}

/* ---------- 合作模式 ---------- */
.coop-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:24px;}
.coop-card{background:#fff;border:1px solid var(--line);border-radius:var(--radius-lg);padding:36px;box-shadow:var(--shadow);}
.coop-card h3{font-size:23px;color:var(--ink);margin-bottom:6px;display:flex;align-items:center;gap:12px;}
.coop-card .badge{font-size:12px;background:var(--ice-soft);color:var(--ink-3);padding:4px 12px;border-radius:999px;font-weight:700;}
.coop-card p{color:var(--muted);font-size:15px;margin-bottom:18px;}
.coop-card ul li{padding:9px 0 9px 26px;position:relative;color:var(--text);font-size:15px;border-bottom:1px dashed var(--line);}
.coop-card ul li:last-child{border-bottom:0;}
.coop-card ul li::before{content:"●";position:absolute;left:6px;top:9px;color:var(--ice);font-size:10px;}

/* ---------- 步骤流程 ---------- */
.steps{display:grid;grid-template-columns:repeat(6,1fr);gap:14px;counter-reset:step;}
.step{background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:22px 16px;text-align:center;position:relative;box-shadow:var(--shadow);}
.step::before{counter-increment:step;content:counter(step);position:absolute;top:-14px;left:50%;transform:translateX(-50%);
  width:30px;height:30px;border-radius:50%;background:var(--grad-accent);color:#fff;font-weight:800;display:grid;place-items:center;font-size:14px;}
.step h4{font-size:15px;color:var(--ink);margin-top:8px;}
.step p{font-size:13px;color:var(--muted);margin-top:6px;}

/* ---------- 技术优势 ---------- */
.tech-grid{display:grid;grid-template-columns:repeat(5,1fr);gap:16px;}
.tech-i{background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:22px 16px;text-align:center;box-shadow:var(--shadow);transition:.2s;}
.tech-i:hover{transform:translateY(-4px);border-color:var(--ice);}
.tech-i .ti{font-size:30px;margin-bottom:10px;}
.tech-i h4{font-size:15px;color:var(--ink);}
.arch{display:grid;grid-template-columns:repeat(4,1fr);gap:18px;margin-top:8px;}
.arch .layer{background:linear-gradient(160deg,#fff,#f3f9ff);border:1px solid var(--line);border-radius:var(--radius);padding:24px;box-shadow:var(--shadow);}
.arch .layer .lv{font-size:12px;letter-spacing:.1em;color:var(--ice);font-weight:800;text-transform:uppercase;}
.arch .layer h4{font-size:18px;color:var(--ink);margin:8px 0;}
.arch .layer p{font-size:13.5px;color:var(--muted);}
.moat{display:grid;grid-template-columns:repeat(3,1fr);gap:22px;margin-top:8px;}
.moat .m{background:#fff;border-left:4px solid var(--ice);border-radius:var(--radius);padding:24px;box-shadow:var(--shadow);}
.moat .m h4{color:var(--ink);font-size:18px;margin-bottom:8px;}
.moat .m p{color:var(--muted);font-size:14.5px;}

/* ---------- 表格 ---------- */
.tbl-wrap{overflow-x:auto;border:1px solid var(--line);border-radius:var(--radius);box-shadow:var(--shadow);}
table.spec{width:100%;border-collapse:collapse;font-size:14.5px;background:#fff;min-width:520px;}
table.spec th,table.spec td{padding:13px 16px;text-align:left;border-bottom:1px solid var(--line);}
table.spec thead th{background:var(--ink);color:#fff;font-weight:700;}
table.spec tbody tr:nth-child(even){background:var(--bg-soft);}
table.spec td b{color:var(--ink-3);}

/* ---------- 资质/专利 ---------- */
.badge-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:20px;}
.badge-card{display:flex;gap:16px;align-items:flex-start;background:#fff;border:1px solid var(--line);
  border-radius:var(--radius);padding:22px;box-shadow:var(--shadow);}
.badge-card .bi{width:46px;height:46px;border-radius:12px;background:var(--ice-soft);color:var(--ink-3);
  display:grid;place-items:center;font-size:22px;flex-shrink:0;}
.badge-card h4{font-size:16px;color:var(--ink);}
.badge-card p{font-size:13.5px;color:var(--muted);margin-top:4px;}

/* ---------- CTA 区块 ---------- */
.cta{background:var(--grad-hero);color:#fff;border-radius:var(--radius-lg);padding:54px 44px;text-align:center;position:relative;overflow:hidden;}
.cta::after{content:"";position:absolute;inset:0;background:radial-gradient(500px 300px at 80% 20%,rgba(79,195,247,.3),transparent 60%);}
.cta-in{position:relative;z-index:1;}
.cta h2{font-size:32px;}
.cta p{color:#cfe6f7;margin:14px auto 26px;max-width:560px;}

/* ---------- 页面头图 ---------- */
.page-hero{background:var(--grad-hero);color:#fff;padding:64px 0 56px;position:relative;overflow:hidden;}
.page-hero::after{content:"";position:absolute;inset:0;background:radial-gradient(600px 300px at 85% 10%,rgba(79,195,247,.28),transparent 60%);}
.page-hero-in{position:relative;z-index:1;}
.page-hero h1{font-size:38px;}
.page-hero p{color:#cfe6f7;margin-top:12px;max-width:640px;}
.breadcrumb{font-size:13.5px;color:#9fc3de;margin-bottom:14px;}
.breadcrumb a:hover{color:#fff;}

/* ---------- 子页网格 ---------- */
.subgrid{display:grid;grid-template-columns:repeat(2,1fr);gap:22px;}
.card{background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:28px;box-shadow:var(--shadow);}
.card h3{color:var(--ink);font-size:19px;margin-bottom:10px;}
.card p{color:var(--muted);font-size:15px;}

/* ---------- 联系/表单 ---------- */
.contact-grid{display:grid;grid-template-columns:1fr 1.1fr;gap:36px;align-items:start;}
.contact-info .ci{display:flex;gap:14px;padding:16px 0;border-bottom:1px solid var(--line);}
.contact-info .ci .ic{width:42px;height:42px;border-radius:11px;background:var(--ice-soft);color:var(--ink-3);display:grid;place-items:center;font-size:20px;flex-shrink:0;}
.contact-info .ci h4{font-size:15px;color:var(--ink);}
.contact-info .ci p{font-size:14.5px;color:var(--muted);}
.form{background:#fff;border:1px solid var(--line);border-radius:var(--radius-lg);padding:32px;box-shadow:var(--shadow);}
.field{margin-bottom:18px;}
.field label{display:block;font-size:14px;font-weight:600;color:var(--ink);margin-bottom:7px;}
.field input,.field textarea{width:100%;padding:12px 14px;border:1px solid var(--line);border-radius:10px;font-size:15px;
  font-family:inherit;color:var(--text);background:#fff;transition:.18s;}
.field input:focus,.field textarea:focus{outline:none;border-color:var(--ice);box-shadow:0 0 0 3px var(--ice-soft);}
.field textarea{resize:vertical;min-height:110px;}
.form .err{color:#d6453b;font-size:13px;margin-top:5px;display:none;}
.form.invalid .err{display:block;}

/* ---------- 页脚 ---------- */
.footer{background:var(--bg-deep);color:#cfe0ee;padding:56px 0 26px;}
.footer-grid{display:grid;grid-template-columns:1.6fr 1fr 1fr 1.2fr;gap:34px;}
.footer h4{color:#fff;font-size:15px;margin-bottom:16px;letter-spacing:.04em;}
.footer a{color:#bcd3e6;font-size:14.5px;display:block;padding:5px 0;transition:.15s;}
.footer a:hover{color:var(--ice);}
.footer .f-about p{font-size:14px;color:#9fbcd2;margin-top:12px;line-height:1.7;}
.footer .f-brand{display:flex;align-items:center;gap:11px;margin-bottom:6px;}
.footer-bottom{border-top:1px solid rgba(255,255,255,.12);margin-top:36px;padding-top:20px;
  display:flex;justify-content:space-between;flex-wrap:wrap;gap:10px;font-size:13px;color:#8fb0c9;}
.footer-bottom a{display:inline;padding:0;color:var(--ice);}

/* ---------- 滚动动画 ---------- */
.reveal{opacity:0;transform:translateY(24px);transition:.6s cubic-bezier(.2,.7,.3,1);}
.reveal.in{opacity:1;transform:none;}

/* ---------- 响应式 ---------- */
@media(max-width:980px){
  .hero-in{grid-template-columns:1fr;gap:34px;}
  .hero h1{font-size:38px;}
  .prod-grid,.sol-grid,.pain-grid,.case-grid,.moat,.badge-grid,.subgrid,.coop-grid{grid-template-columns:repeat(2,1fr);}
  .tech-grid{grid-template-columns:repeat(3,1fr);}
  .arch{grid-template-columns:repeat(2,1fr);}
  .steps{grid-template-columns:repeat(3,1fr);}
  .contact-grid{grid-template-columns:1fr;}
  .footer-grid{grid-template-columns:1fr 1fr;}
}
@media(max-width:680px){
  .nav{position:fixed;top:70px;left:0;right:0;background:#fff;border-bottom:1px solid var(--line);
    flex-direction:column;gap:0;padding:10px 20px;box-shadow:var(--shadow-lg);display:none;max-height:calc(100vh - 70px);overflow:auto;}
  .nav.open{display:flex;}
  .nav a{padding:13px 8px;width:100%;border-bottom:1px solid var(--line);}
  .burger{display:flex;}
  .hero h1{font-size:30px;}
  .section-head h2{font-size:26px;}
  .prod-grid,.sol-grid,.pain-grid,.case-grid,.moat,.badge-grid,.subgrid,.coop-grid,.tech-grid,.arch{grid-template-columns:1fr;}
  .steps{grid-template-columns:repeat(2,1fr);}
  .case-total{flex-direction:column;align-items:flex-start;}
  .footer-grid{grid-template-columns:1fr;}
  .section{padding:54px 0;}
}