/* Surplus Heat Exchangers — industrial editorial style
   Fonts: Barlow Condensed (display) + Source Sans 3 (body)
   Signature color: refinery steel-blue #1b4b8a, accent amber #f5a623 */
:root{
  --ink:#16202b; --ink-soft:#3a4654; --muted:#6b7785;
  --steel:#1b4b8a; --steel-dark:#123667; --steel-light:#eaf1fb;
  --amber:#f5a623; --amber-dark:#d4881a;
  --line:#e2e8f0; --bg:#ffffff; --bg-soft:#f5f7fa;
  --ok:#127a45;
  --radius:10px; --shadow:0 10px 30px -12px rgba(18,54,103,.35);
  --ease:cubic-bezier(.23,1,.32,1);
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{margin:0;font-family:"Source Sans 3",system-ui,Arial,sans-serif;color:var(--ink);background:var(--bg);line-height:1.65;font-size:17px}
.container{width:100%;max-width:1180px;margin:0 auto;padding:0 20px}
h1,h2,h3,h4{font-family:"Barlow Condensed","Source Sans 3",sans-serif;line-height:1.08;letter-spacing:.4px;color:var(--ink);margin:0 0 .5em}
h1{font-size:clamp(2.1rem,5vw,3.4rem);text-transform:uppercase}
h2{font-size:clamp(1.6rem,3.2vw,2.3rem);text-transform:uppercase}
h3{font-size:1.3rem}
a{color:var(--steel);text-decoration:none}
a:hover{text-decoration:underline}
p{margin:0 0 1rem}
img{max-width:100%;height:auto;display:block}
strong{color:var(--ink)}

/* Header */
.site-header{position:sticky;top:0;z-index:40;background:rgba(255,255,255,.92);backdrop-filter:blur(10px);border-bottom:1px solid var(--line)}
.header-inner{display:flex;align-items:center;gap:24px;min-height:68px}
.brand{display:flex;align-items:center;gap:10px;font-family:"Barlow Condensed",sans-serif;text-transform:uppercase;color:var(--ink);line-height:.95;font-size:1.05rem}
.brand:hover{text-decoration:none}
.brand strong{color:var(--steel)}
.main-nav{display:flex;gap:20px;margin-left:auto;flex-wrap:wrap}
.main-nav a{color:var(--ink-soft);font-weight:600;font-size:.96rem}
.main-nav a:hover{color:var(--steel);text-decoration:none}
.header-cta{background:var(--amber);color:#1c1206;font-weight:700;padding:10px 16px;border-radius:8px;white-space:nowrap;transition:transform .16s var(--ease),background .16s var(--ease)}
.header-cta:hover{background:var(--amber-dark);text-decoration:none}
.header-cta:active{transform:scale(.97)}

/* Hero with heat exchanger background (every page) */
.hero{position:relative;color:#fff;background:#0e2748;overflow:hidden}
.hero::before{content:"";position:absolute;inset:0;background-image:var(--hero-img);background-size:cover;background-position:center;opacity:.9}
.hero::after{content:"";position:absolute;inset:0;background:linear-gradient(90deg,rgba(6,16,32,.86) 0%,rgba(6,16,32,.66) 42%,rgba(6,16,32,.30) 70%,rgba(6,16,32,.12) 100%)}
.hero-inner{position:relative;z-index:2;padding:84px 0 76px;max-width:900px}
.hero.compact .hero-inner{padding:52px 0 46px}
.hero h1{color:#fff;text-shadow:0 2px 18px rgba(0,0,0,.35)}
.hero .lead{font-size:1.2rem;color:#dce7f5;max-width:680px;margin-bottom:1.4rem}
.hero .answer{background:rgba(6,16,32,.72);backdrop-filter:blur(3px);border:1px solid rgba(255,255,255,.12);border-left:4px solid var(--amber);padding:18px 22px;border-radius:8px;font-size:1.06rem;line-height:1.6;color:#eef4fc;max-width:640px;margin-bottom:1.4rem}
.hero .answer strong{color:#fff}
.hero-actions{display:flex;gap:14px;flex-wrap:wrap}
.eyebrow{display:inline-block;font-family:"Barlow Condensed",sans-serif;text-transform:uppercase;letter-spacing:2px;color:var(--amber);font-weight:700;font-size:.95rem;margin-bottom:.5rem}

/* Buttons */
.btn{display:inline-block;font-weight:700;padding:13px 22px;border-radius:9px;transition:transform .16s var(--ease),background .16s var(--ease),box-shadow .16s var(--ease);font-size:1rem}
.btn:hover{text-decoration:none}
.btn:active{transform:scale(.97)}
.btn-primary{background:var(--amber);color:#1c1206;box-shadow:0 8px 22px -8px rgba(245,166,35,.7)}
.btn-primary:hover{background:var(--amber-dark)}
.btn-ghost{background:rgba(255,255,255,.12);color:#fff;border:1px solid rgba(255,255,255,.4)}
.btn-ghost:hover{background:rgba(255,255,255,.2)}
.btn-steel{background:var(--steel);color:#fff}
.btn-steel:hover{background:var(--steel-dark)}

/* Value prop strip */
.valueprops{background:var(--steel-dark);color:#fff}
.valueprops ul{list-style:none;margin:0;padding:14px 20px;display:flex;gap:26px;flex-wrap:wrap;justify-content:center;font-weight:600;font-size:.96rem}
.valueprops li{display:flex;align-items:center;gap:8px}
.valueprops li::before{content:"✓";color:var(--amber);font-weight:800}

/* Breadcrumbs */
.breadcrumbs{background:var(--bg-soft);border-bottom:1px solid var(--line);font-size:.9rem}
.breadcrumbs ol{list-style:none;display:flex;flex-wrap:wrap;gap:8px;align-items:center;margin:0;padding:10px 20px;color:var(--muted)}
.breadcrumbs a{color:var(--steel-dark);font-weight:600}
.breadcrumbs .sep{color:var(--muted)}
.breadcrumbs li[aria-current]{color:var(--ink);font-weight:600}

/* Sections & layout */
section{padding:48px 0}
.section-tight{padding:34px 0}
.prose{max-width:760px}
.prose p,.prose li{font-size:1.05rem}
.lede{font-size:1.18rem;color:var(--ink-soft)}
.grid{display:grid;gap:20px}
.grid-2{grid-template-columns:repeat(2,1fr)}
.grid-3{grid-template-columns:repeat(3,1fr)}
.grid-4{grid-template-columns:repeat(4,1fr)}
.two-col{display:grid;grid-template-columns:1.6fr .9fr;gap:40px;align-items:start}

/* Cards */
.card{background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:22px;transition:transform .18s var(--ease),box-shadow .18s var(--ease),border-color .18s var(--ease)}
.card:hover{transform:translateY(-3px);box-shadow:var(--shadow);border-color:#cdd9e8}
.card h3{margin-bottom:.35rem}
.card p{color:var(--ink-soft);font-size:.98rem;margin-bottom:.6rem}
.card a.more{font-weight:700}
.bg-soft{background:var(--bg-soft)}
.chip{display:inline-block;background:var(--steel-light);color:var(--steel-dark);font-weight:700;font-size:.8rem;padding:4px 10px;border-radius:999px;margin:0 6px 6px 0}

/* Tables */
table{width:100%;border-collapse:collapse;margin:1rem 0;font-size:.98rem}
th,td{text-align:left;padding:11px 13px;border-bottom:1px solid var(--line)}
th{background:var(--steel-light);color:var(--steel-dark);font-weight:700}
tr:hover td{background:var(--bg-soft)}

/* FAQ */
.faq details{border:1px solid var(--line);border-radius:9px;padding:4px 18px;margin-bottom:12px;background:#fff}
.faq summary{cursor:pointer;font-weight:700;padding:13px 0;font-size:1.06rem;list-style:none}
.faq summary::-webkit-details-marker{display:none}
.faq summary::before{content:"+";color:var(--amber);font-weight:800;margin-right:10px}
.faq details[open] summary::before{content:"–"}
.faq details p{padding-bottom:14px;color:var(--ink-soft);margin:0}

/* CTA band */
.cta-band{background:linear-gradient(120deg,var(--steel) 0%,var(--steel-dark) 100%);color:#fff}
.cta-inner{display:flex;align-items:center;justify-content:space-between;gap:30px;flex-wrap:wrap}
.cta-band h2{color:#fff;margin-bottom:.3rem}
.cta-band p{color:#cfe0f5;max-width:560px;margin:0}
.cta-actions{display:flex;gap:12px;flex-wrap:wrap}

/* Quote form */
.quote-form{background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:24px;box-shadow:var(--shadow)}
.quote-form label{display:block;font-weight:600;margin:12px 0 5px;font-size:.95rem}
.quote-form input,.quote-form select,.quote-form textarea{width:100%;padding:11px 13px;border:1px solid var(--line);border-radius:8px;font:inherit;background:var(--bg-soft)}
.quote-form input:focus,.quote-form select:focus,.quote-form textarea:focus{outline:2px solid var(--steel);background:#fff}
.quote-note{font-size:.85rem;color:var(--muted);margin-top:10px}

/* Link lists */
.linklist{columns:3;column-gap:30px;list-style:none;padding:0;margin:0}
.linklist li{margin-bottom:8px;break-inside:avoid}
.linklist a{font-weight:600}

/* Round floating phone button (every page) */
.call-fab{position:fixed;right:20px;bottom:20px;z-index:60;width:62px;height:62px;border-radius:50%;display:flex;align-items:center;justify-content:center;background:var(--steel);color:#fff;box-shadow:0 16px 38px -10px rgba(18,54,103,.75);transition:transform .16s var(--ease),background .16s var(--ease)}
.call-fab:hover{background:var(--steel-dark);text-decoration:none;transform:scale(1.05)}
.call-fab:active{transform:scale(.95)}
.call-fab svg{flex:none}
.call-fab::after{content:"";position:absolute;inset:0;border-radius:50%;border:2px solid var(--steel);opacity:.55;animation:fabPulse 2.4s var(--ease) infinite}
@keyframes fabPulse{0%{transform:scale(1);opacity:.55}70%{transform:scale(1.5);opacity:0}100%{opacity:0}}
@media (prefers-reduced-motion: reduce){.call-fab::after{animation:none;display:none}}

/* Article */
.article{max-width:760px;margin:0 auto}
.article h2{margin-top:1.8rem}
.article h3{margin-top:1.3rem;color:var(--steel-dark)}
.article ul,.article ol{padding-left:22px}
.article li{margin-bottom:.5rem}
.meta{color:var(--muted);font-size:.9rem;margin-bottom:1rem}
blockquote{border-left:4px solid var(--amber);background:var(--bg-soft);margin:1.3rem 0;padding:14px 20px;border-radius:0 8px 8px 0;font-size:1.05rem}

.section-head{max-width:720px;margin-bottom:26px}
.section-head .eyebrow{color:var(--amber-dark)}
.muted{color:var(--muted)}
.center{text-align:center}
hr{border:none;border-top:1px solid var(--line);margin:32px 0}

/* Responsive */
@media (max-width:900px){
  .two-col{grid-template-columns:1fr}
  .grid-4{grid-template-columns:repeat(2,1fr)}
  .grid-3{grid-template-columns:repeat(2,1fr)}
  .linklist{columns:2}
}
@media (max-width:680px){
  body{font-size:16px}
  .main-nav{display:none}
  .header-inner{gap:12px}
  .grid-2,.grid-3,.grid-4{grid-template-columns:1fr}
  .linklist{columns:1}
  .call-fab{width:58px;height:58px;right:16px;bottom:16px}
  .cta-inner{flex-direction:column;align-items:flex-start}
  .hero{min-height:auto}
  .hero::before{opacity:1;background-image:var(--hero-img-mobile,var(--hero-img));background-size:140% auto;background-position:center 88%}
  .hero::after{background:linear-gradient(180deg,rgba(6,16,32,.28) 0%,rgba(6,16,32,.40) 45%,rgba(6,16,32,.72) 100%)}
  .hero-inner{padding:64px 0 32px;display:block;min-height:0}
  .hero.compact .hero-inner{padding:92px 0 32px}
  .hero .answer{font-size:.98rem;padding:16px 18px}
}
@media (prefers-reduced-motion:reduce){*{transition:none!important;scroll-behavior:auto!important}}

/* Blog post body */
.post-body{max-width:none}
.post-body .article-answer{background:var(--steel-light);border-left:4px solid var(--steel);padding:16px 20px;border-radius:0 8px 8px 0;font-size:1.12rem;margin-bottom:1.4rem}
.post-body h2{margin-top:1.9rem;font-size:1.7rem}
.post-body h3{margin-top:1.2rem;color:var(--steel-dark)}
.post-body ul,.post-body ol{padding-left:22px}
.post-body li{margin-bottom:.5rem;font-size:1.05rem}
.post-body table{font-size:.96rem}
.post-meta{color:#cfe0f5;font-weight:600;font-size:.95rem}
.blog-card{display:flex;flex-direction:column;overflow:hidden;padding:0}
.blog-card .blog-card-img{display:block;width:100%;aspect-ratio:16/9;background-size:cover;background-position:center;border-bottom:1px solid var(--line)}
.blog-card .cat{display:inline-block;background:var(--amber);color:#1c1206;font-weight:700;font-size:.72rem;text-transform:uppercase;letter-spacing:.6px;padding:3px 9px;border-radius:5px;margin:14px 18px 0}
.blog-card h3{font-size:1.15rem;margin:8px 18px 0}
.blog-card p{margin:8px 18px 0}
.blog-card .more{margin:10px 18px 18px;font-weight:700}
/* In-article photographic header */
.post-hero{margin:0 0 1.6rem;border-radius:var(--radius);overflow:hidden;box-shadow:var(--shadow)}
.post-hero img{display:block;width:100%;height:auto;aspect-ratio:16/9;object-fit:cover}
/* Article → location internal-link block */
.region-block{background:var(--bg-soft);border-left:4px solid var(--steel)}
.region-block h3{color:var(--steel-dark)}
.region-block h4{font-size:.95rem;text-transform:uppercase;letter-spacing:.6px;color:var(--ink-soft);margin:0 0 8px}
.region-cols{display:grid;grid-template-columns:1fr 1fr;gap:24px;margin-top:14px}
.linklist--tight{margin:0;padding:0;list-style:none;columns:auto}
.linklist--tight li{margin-bottom:6px;break-inside:avoid}
.linklist--tight a{font-weight:600}
@media (max-width:680px){.region-cols{grid-template-columns:1fr;gap:16px}}
/* Horizontal scroll guard for wide comparison tables on mobile */
.table-wrap{overflow-x:auto;-webkit-overflow-scrolling:touch}
.table-note{font-size:.85rem;margin-top:6px}

/* Footer */
.site-footer{background:#0e1b2c;color:#aebfd2;padding:54px 0 24px;margin-top:10px}
.site-footer a{color:#cdd9e8}
.site-footer a:hover{color:#fff}
.footer-grid{display:grid;grid-template-columns:1.6fr 1fr 1fr 1fr;gap:34px}
.footer-brand img{margin-bottom:12px}
.footer-brand p{color:#9fb2c8;font-size:.95rem}
.footer-phone a{color:#fff;font-weight:700;font-size:1.05rem}
.site-footer h3{color:#fff;font-size:1.05rem;text-transform:uppercase;letter-spacing:.5px;margin-bottom:12px}
.site-footer ul{list-style:none;padding:0;margin:0}
.site-footer li{margin-bottom:8px;font-size:.95rem}
.footer-legal{border-top:1px solid rgba(255,255,255,.12);margin-top:34px;padding-top:18px}
.footer-legal p{font-size:.82rem;color:#7e91a8;margin:0}
@media (max-width:900px){.footer-grid{grid-template-columns:1fr 1fr}}
@media (max-width:680px){.footer-grid{grid-template-columns:1fr}}