/* Fuliang Refrigeration — coolingtower.huibai.ltd */
:root{
  --navy:#081f3a; --navy-2:#0b2a4f; --primary:#0a5cd6; --primary-dark:#0847a8;
  --accent:#00b4d8; --ink:#1c2b3a; --muted:#5a6b7d; --line:#e3eaf2;
  --bg:#ffffff; --bg-alt:#f4f8fc; --radius:14px;
  --shadow:0 10px 30px rgba(8,31,58,.08); --shadow-lg:0 22px 50px rgba(8,31,58,.16);
}
*{margin:0;padding:0;box-sizing:border-box}
html{scroll-behavior:smooth}
body{font-family:'Inter',-apple-system,BlinkMacSystemFont,'Segoe UI',Roboto,'Helvetica Neue',Arial,sans-serif;
  color:var(--ink);line-height:1.7;font-size:16px;background:var(--bg)}
img{max-width:100%;height:auto;display:block}
a{color:var(--primary);text-decoration:none}
a:hover{text-decoration:none}
h1,h2,h3{line-height:1.2;font-weight:800;letter-spacing:-.02em;color:var(--navy)}
h1{font-size:clamp(2rem,4.5vw,3.3rem)}
h2{font-size:clamp(1.6rem,3vw,2.3rem)}
h3{font-size:1.15rem;font-weight:700}
.container{width:min(1200px,92%);margin:0 auto}
.narrow{max-width:860px}
.center{text-align:center;margin-top:2.5rem}
.skip-link{position:absolute;left:-999px;top:0;background:var(--navy);color:#fff;padding:.6rem 1rem;z-index:200}
.skip-link:focus{left:8px}

/* ---------- buttons ---------- */
.btn{display:inline-flex;align-items:center;justify-content:center;gap:.5rem;font-weight:600;
  padding:.85rem 1.7rem;border-radius:999px;border:2px solid transparent;cursor:pointer;
  transition:.25s;font-size:1rem;white-space:nowrap}
.btn-primary{background:linear-gradient(120deg,var(--primary),var(--accent));color:#fff;
  box-shadow:0 8px 22px rgba(10,92,214,.35)}
.btn-primary:hover{transform:translateY(-2px);box-shadow:0 12px 28px rgba(10,92,214,.45)}
.btn-ghost{border-color:rgba(255,255,255,.7);color:#fff}
.btn-ghost:hover{background:rgba(255,255,255,.14)}
.btn-outline{border-color:var(--primary);color:var(--primary)}
.btn-outline:hover{background:var(--primary);color:#fff}
.btn-light{background:#fff;color:var(--primary)}
.btn-light:hover{transform:translateY(-2px);box-shadow:var(--shadow-lg)}
.btn-lg{padding:1rem 2.2rem;font-size:1.05rem}
.btn-sm{padding:.5rem 1.2rem;font-size:.9rem}
.btn-block{width:100%}

/* ---------- header ---------- */
.site-header{position:sticky;top:0;z-index:100;background:rgba(255,255,255,.92);
  backdrop-filter:blur(10px);border-bottom:1px solid var(--line)}
.header-inner{display:flex;align-items:center;justify-content:space-between;gap:1rem;padding:.8rem 0}
.brand img{max-height:56px;width:auto}
.brand-text{display:none;flex-direction:column;line-height:1.1;font-weight:800;font-size:22px;letter-spacing:.14em;color:var(--ink);white-space:nowrap}
.brand-text small{font-size:10px;font-weight:600;letter-spacing:.34em;color:var(--accent)}
.main-nav{display:flex;align-items:center;gap:1.8rem}
.main-nav a{color:var(--ink);font-weight:600;font-size:.98rem;position:relative;padding:.3rem 0}
.main-nav a::after{content:"";position:absolute;left:0;bottom:-2px;width:0;height:2px;
  background:linear-gradient(90deg,var(--primary),var(--accent));transition:.25s}
.main-nav a:hover::after,.main-nav a.active::after{width:100%}
.main-nav a.active{color:var(--primary)}
.nav-cta{margin-left:.5rem}
.nav-toggle{display:none;flex-direction:column;gap:5px;background:none;border:0;cursor:pointer;padding:.5rem}
.nav-toggle span{width:26px;height:3px;background:var(--navy);border-radius:2px;transition:.3s}

/* ---------- hero ---------- */
.hero{position:relative;min-height:min(78vh,760px);display:flex;align-items:center;
  background:linear-gradient(118deg,rgba(6,24,48,.94) 8%,rgba(8,42,79,.82) 46%,rgba(6,24,48,.55) 100%),
  url('/img/banner.jpg') center/cover no-repeat;color:#fff}
.hero-inner{padding:7rem 0}
.hero-kicker{display:inline-block;font-size:.85rem;font-weight:700;letter-spacing:.14em;text-transform:uppercase;
  color:#9fd4ff;border:1px solid rgba(159,212,255,.4);padding:.35rem 1rem;border-radius:999px;margin-bottom:1.4rem}
.hero h1{color:#fff;margin-bottom:1.2rem}
.hero-sub{font-size:1.15rem;max-width:640px;color:#dbe7f5;margin-bottom:2.2rem}
.hero-actions{display:flex;gap:1rem;flex-wrap:wrap}

/* ---------- stats ---------- */
.stats{background:var(--navy);color:#fff;padding:2.2rem 0}
.stats-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:1.5rem;text-align:center}
.stat strong{display:block;font-size:clamp(1.4rem,2.4vw,2rem);font-weight:800;
  background:linear-gradient(90deg,#6db9ff,#00d4ff);-webkit-background-clip:text;background-clip:text;color:transparent}
.stat span{font-size:.9rem;color:#a9bcd2}

/* ---------- sections ---------- */
.section{padding:5.5rem 0}
.section-alt{background:var(--bg-alt)}
.section-head{max-width:760px;margin:0 auto 3rem;text-align:center}
.section-head.left{margin-left:0;text-align:left}
.eyebrow{display:inline-block;font-size:.8rem;font-weight:700;letter-spacing:.14em;text-transform:uppercase;
  color:var(--primary);margin-bottom:.6rem}
.section-head p:not(.eyebrow){color:var(--muted);margin-top:.8rem}

/* ---------- split ---------- */
.split{display:grid;grid-template-columns:1fr 1.1fr;gap:3.5rem;align-items:center}
.split-media img{border-radius:var(--radius);box-shadow:var(--shadow-lg)}
.split-body p{margin-bottom:1.1rem;color:var(--muted)}
.split-body .btn{margin-top:.6rem}

/* ---------- cards ---------- */
.card-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(290px,1fr));gap:1.8rem;margin-bottom:2rem}
.card{background:#fff;border:1px solid var(--line);border-radius:var(--radius);overflow:hidden;
  transition:.3s;display:flex;flex-direction:column}
.card:hover{transform:translateY(-6px);box-shadow:var(--shadow-lg);border-color:transparent}
.card-media{display:block;aspect-ratio:1/1;overflow:hidden;background:var(--bg-alt)}
.card-media img{width:100%;height:100%;object-fit:cover;transition:.5s}
.card:hover .card-media img{transform:scale(1.05)}
.card-body{padding:1.4rem 1.5rem 1.6rem;display:flex;flex-direction:column;gap:.6rem;flex:1}
.badge{display:inline-block;align-self:flex-start;font-size:.72rem;font-weight:700;letter-spacing:.08em;
  text-transform:uppercase;color:var(--primary);background:rgba(10,92,214,.09);padding:.28rem .8rem;border-radius:999px}
.card-body h3 a{color:var(--navy)}
.card-body h3 a:hover{color:var(--primary)}
.card-specs{display:flex;flex-direction:column;gap:.2rem;color:var(--muted);font-size:.92rem;flex:1}
.card-link{font-weight:600;font-size:.95rem}

/* ---------- cases ---------- */
.case-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(260px,1fr));gap:1.8rem}
.case-card{border-radius:var(--radius);overflow:hidden;position:relative;box-shadow:var(--shadow)}
.case-card img{width:100%;height:240px;object-fit:cover;transition:.5s}
.case-card:hover img{transform:scale(1.06)}
.case-card figcaption{padding:1.2rem 1.4rem;background:#fff}
.case-card h3{margin-bottom:.3rem}
.case-card p{color:var(--muted);font-size:.92rem}

/* ---------- why ---------- */
.why-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(300px,1fr));gap:1.6rem}
.why-card{background:#fff;border-radius:var(--radius);padding:1.9rem;border:1px solid var(--line);transition:.3s}
.why-card:hover{box-shadow:var(--shadow-lg);transform:translateY(-4px)}
.why-card h3{margin-bottom:.6rem;color:var(--navy)}
.why-card p{color:var(--muted);font-size:.95rem}
.industry-strip{margin-top:3.5rem;text-align:center}
.chips{display:flex;flex-wrap:wrap;gap:.6rem;justify-content:center}
.chip{display:inline-block;background:#fff;border:1px solid var(--line);color:var(--ink);
  padding:.42rem 1.05rem;border-radius:999px;font-size:.88rem;font-weight:500}
.chip:hover{border-color:var(--primary);color:var(--primary)}

/* ---------- page hero ---------- */
.page-hero{background:linear-gradient(118deg,var(--navy) 10%,var(--navy-2) 60%,#123b6e 100%);color:#fff;padding:4.5rem 0 4rem}
.page-hero h1{color:#fff;margin:.4rem 0 .6rem}
.page-hero p{color:#c6d6e8;max-width:720px}
.breadcrumb{font-size:.85rem;color:#9db3cc;display:flex;gap:.5rem;flex-wrap:wrap}
.breadcrumb a{color:#cfe2f8}
.breadcrumb a:hover{color:#fff}
.product-hero{padding-bottom:3.2rem}

/* ---------- category bar ---------- */
.cat-bar{position:sticky;top:72px;z-index:60;background:#fff;border-bottom:1px solid var(--line);
  box-shadow:0 4px 14px rgba(8,31,58,.05)}
.cat-chips{display:flex;gap:.6rem;overflow-x:auto;padding:.9rem 0;scrollbar-width:none}
.cat-chips::-webkit-scrollbar{display:none}
.cat-chips .chip{white-space:nowrap}
.product-section{scroll-margin-top:140px}

/* ---------- product detail ---------- */
.detail-top{display:grid;grid-template-columns:minmax(280px,460px) 1fr;gap:3.5rem;align-items:start}
.detail-media img{border-radius:var(--radius);box-shadow:var(--shadow-lg);border:1px solid var(--line)}
.detail-specs h2{margin-bottom:1.2rem}
.spec-table{width:100%;border-collapse:collapse;margin-bottom:1.6rem}
.spec-table th,.spec-table td{padding:.85rem 1.1rem;border-bottom:1px solid var(--line);text-align:left;vertical-align:top}
.spec-table th{width:38%;color:var(--navy);font-weight:600;background:var(--bg-alt)}
.spec-table tr:last-child th,.spec-table tr:last-child td{border-bottom:0}
.prose p{margin-bottom:1.15rem;color:#33465c}
.feature-list{list-style:none;display:grid;grid-template-columns:repeat(auto-fill,minmax(340px,1fr));gap:1rem 2rem}
.feature-list li{position:relative;padding:.4rem 0 .4rem 2.2rem;color:#33465c}
.feature-list li::before{content:"";position:absolute;left:0;top:.75rem;width:22px;height:22px;border-radius:50%;
  background:linear-gradient(120deg,var(--primary),var(--accent)) no-repeat center/12px 9px;
  background-image:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='white' stroke-width='4' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpolyline points='20 6 9 17 4 12'/%3E%3C/svg%3E");background-repeat:no-repeat;background-position:center;background-size:12px}
.faq details{background:#fff;border:1px solid var(--line);border-radius:12px;margin-bottom:.9rem;padding:1.1rem 1.4rem}
.faq summary{font-weight:700;cursor:pointer;color:var(--navy);list-style:none;position:relative;padding-right:2rem}
.faq summary::-webkit-details-marker{display:none}
.faq summary::after{content:"+";position:absolute;right:0;top:0;font-size:1.3rem;color:var(--primary);transition:.2s}
.faq details[open] summary::after{transform:rotate(45deg)}
.faq details p{margin-top:.7rem;color:var(--muted)}

/* ---------- values / about ---------- */
.value-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(250px,1fr));gap:1.6rem}
.value-grid-5 .value-card{text-align:left}
.value-card{background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:1.9rem;transition:.3s}
.value-card:hover{box-shadow:var(--shadow-lg);transform:translateY(-4px)}
.value-card h3{margin-bottom:.55rem}
.value-card p{color:var(--muted);font-size:.95rem}

/* ---------- contact ---------- */
.contact-grid{display:grid;grid-template-columns:1fr 1.15fr;gap:4rem;align-items:start}
.contact-info h2{margin-bottom:1rem}
.contact-info>p{color:var(--muted);margin-bottom:1.4rem}
.check-list{list-style:none;margin-bottom:2.2rem}
.check-list li{position:relative;padding:.35rem 0 .35rem 2rem;color:#33465c}
.check-list li::before{content:"✓";position:absolute;left:0;top:.35rem;width:22px;height:22px;border-radius:50%;
  background:linear-gradient(120deg,var(--primary),var(--accent));color:#fff;font-size:.8rem;font-weight:700;
  display:flex;align-items:center;justify-content:center}
.contact-steps{display:flex;flex-direction:column;gap:1.2rem;margin-bottom:2.2rem}
.step{display:flex;gap:1.1rem;align-items:flex-start}
.step span{flex:none;width:40px;height:40px;border-radius:50%;background:var(--navy);color:#fff;font-weight:700;
  display:flex;align-items:center;justify-content:center}
.step h3{font-size:1.02rem;margin-bottom:.15rem}
.step p{color:var(--muted);font-size:.93rem}
.contact-address{background:var(--bg-alt);border-radius:var(--radius);padding:1.5rem 1.7rem}
.contact-address h3{margin-bottom:.5rem}
.contact-address p{color:var(--muted);font-size:.95rem}
.contact-form{background:#fff;border:1px solid var(--line);border-radius:var(--radius);
  padding:2.4rem;box-shadow:var(--shadow)}
.contact-form h2{margin-bottom:.3rem}
.form-note{color:var(--muted);font-size:.9rem;margin-bottom:1.5rem}
.form-row{display:grid;grid-template-columns:1fr 1fr;gap:1.2rem}
.form-field{margin-bottom:1.2rem}
.form-field label{display:block;font-weight:600;font-size:.92rem;margin-bottom:.4rem;color:var(--navy)}
.form-field input,.form-field select,.form-field textarea{width:100%;padding:.8rem 1rem;border:1px solid var(--line);
  border-radius:10px;font:inherit;color:var(--ink);background:var(--bg-alt);transition:.2s}
.form-field input:focus,.form-field select:focus,.form-field textarea:focus{outline:none;border-color:var(--primary);
  background:#fff;box-shadow:0 0 0 4px rgba(10,92,214,.12)}
.hp-field{position:absolute;left:-9999px;height:0;width:0;opacity:0}
.form-privacy{color:var(--muted);font-size:.82rem;margin-top:.9rem;text-align:center}
.form-status{max-width:640px;margin:0 auto 1.6rem;padding:1rem 1.4rem;border-radius:12px;font-weight:600}
.form-status.ok{background:#e8f8ef;color:#0d7a3e;border:1px solid #b7e4c7}
.form-status.err{background:#fdeeee;color:#b02a2a;border:1px solid #f2c4c4}

/* ---------- cta band ---------- */
.cta-band{background:linear-gradient(118deg,var(--navy) 0%,#0d3a70 55%,var(--primary) 130%);color:#fff;padding:4rem 0}
.cta-inner{display:flex;align-items:center;justify-content:space-between;gap:2rem;flex-wrap:wrap}
.cta-inner h2{color:#fff;margin-bottom:.4rem}
.cta-inner p{color:#c6d6e8;max-width:560px}

/* ---------- footer ---------- */
.site-footer{background:var(--navy);color:#b9c8da;padding:4rem 0 0}
.footer-grid{display:grid;grid-template-columns:1.4fr 1fr 1fr 1.4fr;gap:2.5rem;padding-bottom:3rem}
.footer-brand p{margin-top:1rem;font-size:.93rem}
.footer-domain{color:#7fb2ee;font-weight:600}
.footer-col h4{color:#fff;font-size:1rem;margin-bottom:1.1rem}
.footer-col ul{list-style:none}
.footer-col li{margin-bottom:.55rem}
.footer-col a{color:#b9c8da}
.footer-col a:hover{color:#fff}
.muted{font-size:.88rem;color:#8ea2ba}
.footer-bottom{border-top:1px solid rgba(255,255,255,.1);padding:1.3rem 0;font-size:.85rem;text-align:center}

/* ---------- reveal ---------- */
.reveal{opacity:0;transform:translateY(24px);transition:opacity .7s ease,transform .7s ease}
.reveal.visible{opacity:1;transform:none}

/* ---------- responsive ---------- */
@media (max-width:992px){
  .split,.contact-grid,.detail-top{grid-template-columns:1fr;gap:2.5rem}
  .footer-grid{grid-template-columns:1fr 1fr}
  .stats-grid{grid-template-columns:repeat(2,1fr)}
  .detail-media{max-width:520px}
  .section{padding:4rem 0}
}
@media (max-width:768px){
  .nav-toggle{display:flex}
  .main-nav{position:fixed;top:72px;left:0;right:0;background:#fff;flex-direction:column;align-items:stretch;
    padding:1.2rem 5%;gap:.4rem;border-bottom:1px solid var(--line);box-shadow:var(--shadow-lg);
    transform:translateY(-130%);transition:transform .3s;z-index:99}
  .main-nav.open{transform:translateY(0)}
  .main-nav a{padding:.8rem .4rem}
  .main-nav a::after{display:none}
  .nav-cta{margin:.6rem 0 0;justify-content:center}
  body.nav-open .nav-toggle span:nth-child(1){transform:translateY(8px) rotate(45deg)}
  body.nav-open .nav-toggle span:nth-child(2){opacity:0}
  body.nav-open .nav-toggle span:nth-child(3){transform:translateY(-8px) rotate(-45deg)}
  .cat-bar{top:64px}
  .footer-grid{grid-template-columns:1fr}
  .form-row{grid-template-columns:1fr}
  .contact-form{padding:1.6rem}
  .cta-inner{flex-direction:column;text-align:center}
  .hero-inner{padding:5rem 0}
  .section{padding:3.4rem 0}
  .cat-bar{position:static}
}