/*
Theme Name: Airvent Systems
Theme URI: https://airventsystem.com/
Author: Airvent Systems
Author URI: https://airventsystem.com/
Description: Custom WordPress theme for Airvent Systems, manufacturer of industrial blowers, dust collectors, wet scrubbers, FD/ID fans and tube axial fans. Built with a custom "Products" post type, Customizer contact settings, and full SEO/AEO schema markup.
Version: 1.0.0
Requires at least: 6.0
Requires PHP: 7.4
Text Domain: airvent
*/

/* ==========================================================================
   AIRVENT SYSTEMS, Design Tokens & Base
   ========================================================================== */
:root{
  --charcoal-dark:#0a2140;
  --charcoal:#1f2a37;
  --charcoal-soft:#2d3b4d;
  --blue:#0c56a8;
  --blue-light:#1f8fe0;
  --blue-pale:#e6f2fb;
  --steel:#6b7280;
  --steel-light:#9ca3af;
  --paper:#f5f5f7;
  --white:#ffffff;
  --green:#5aba01;
  --green-dark:#468f00;
  --line:#e3e3e8;

  --font-display:'Oswald', sans-serif;
  --font-body:'Inter', sans-serif;
  --font-mono:'IBM Plex Mono', monospace;

  --radius:4px;
  --shadow-sm:0 1px 3px rgba(27,28,32,.08);
  --shadow-md:0 8px 24px rgba(27,28,32,.12);
  --shadow-lg:0 20px 50px rgba(27,28,32,.18);
  --container:1200px;
}

*,*::before,*::after{box-sizing:border-box;}
html{scroll-behavior:smooth;}
body{
  margin:0;
  font-family:var(--font-body);
  color:var(--charcoal);
  background:var(--white);
  line-height:1.6;
  -webkit-font-smoothing:antialiased;
}
img{max-width:100%;display:block;}
a{color:inherit;text-decoration:none;}
ul{margin:0;padding:0;list-style:none;}
h1,h2,h3,h4{
  font-family:var(--font-display);
  text-transform:uppercase;
  letter-spacing:.02em;
  color:var(--charcoal-dark);
  margin:0 0 .5em;
  line-height:1.15;
}
p{margin:0 0 1em;color:var(--steel);}
.container{max-width:var(--container);margin:0 auto;padding:0 24px;}
section{padding:72px 0;}
.section-tight{padding:48px 0;}
:focus-visible{outline:3px solid var(--green);outline-offset:2px;}

/* Eyebrow / labels */
.eyebrow{
  font-family:var(--font-mono);
  font-size:.78rem;
  letter-spacing:.14em;
  text-transform:uppercase;
  color:var(--green-dark);
  display:inline-block;
  margin-bottom:14px;
  font-weight:600;
}

.section-head{max-width:680px;margin:0 auto 48px;text-align:center;}
.section-head h2{font-size:clamp(1.8rem,3vw,2.6rem);}
.section-head p{font-size:1.05rem;}

/* Buttons */
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:8px;
  font-family:var(--font-display);
  text-transform:uppercase;
  letter-spacing:.06em;
  font-size:.92rem;
  padding:14px 30px;
  border-radius:var(--radius);
  border:2px solid transparent;
  cursor:pointer;
  transition:transform .15s ease, box-shadow .15s ease, background .15s ease, color .15s ease;
}
.btn-primary{background:var(--green);color:var(--charcoal-dark);}
.btn-primary:hover{background:var(--green-dark);transform:translateY(-2px);box-shadow:var(--shadow-md);}
.btn-outline{border-color:var(--white);color:var(--white);}
.btn-outline:hover{background:var(--white);color:var(--charcoal-dark);}
.btn-outline-dark{border-color:var(--charcoal-dark);color:var(--charcoal-dark);}
.btn-outline-dark:hover{background:var(--charcoal-dark);color:var(--white);}
.btn-block{width:100%;}

/* ==========================================================================
   Top utility bar
   ========================================================================== */
.topbar{
  background:var(--charcoal-dark);
  color:#c9cad0;
  font-family:var(--font-mono);
  font-size:.8rem;
}
.topbar .container{
  display:flex;justify-content:space-between;align-items:center;
  padding-top:9px;padding-bottom:9px;flex-wrap:wrap;gap:8px;
}
.topbar a{color:#e7e7ea;}
.topbar a:hover{color:var(--green);}
.topbar .tb-links{display:flex;gap:22px;flex-wrap:wrap;}
.topbar .tb-social a{margin-left:14px;}

/* ==========================================================================
   Header / Nav
   ========================================================================== */
header.site-header{
  background:var(--white);
  border-bottom:1px solid var(--line);
  position:sticky;top:0;z-index:100;
}
.nav-wrap{display:flex;align-items:center;justify-content:space-between;padding:12px 24px;gap:24px;}
.brand{display:flex;align-items:center;gap:12px;}
.brand img{height:52px;width:auto;}
.brand-text{font-family:var(--font-display);font-size:1.05rem;color:var(--charcoal-dark);line-height:1.1;}
.brand-text small{display:block;font-family:var(--font-mono);font-size:.6rem;letter-spacing:.12em;color:var(--blue-light);text-transform:uppercase;margin-top:2px;}

nav.main-nav{display:flex;align-items:center;gap:6px;}
nav.main-nav > ul{display:flex;align-items:center;gap:2px;}
nav.main-nav > ul > li{position:relative;}
nav.main-nav > ul > li > a{
  display:block;padding:14px 16px;font-family:var(--font-display);
  font-size:.92rem;letter-spacing:.03em;text-transform:uppercase;color:var(--charcoal);
  border-bottom:3px solid transparent;
}
nav.main-nav > ul > li > a:hover,
nav.main-nav > ul > li.active > a{color:var(--blue);border-bottom-color:var(--green);}

.has-dropdown .dropdown{
  position:absolute;top:100%;left:0;background:var(--white);
  min-width:260px;box-shadow:var(--shadow-lg);border-top:3px solid var(--green);
  padding:10px 0;opacity:0;visibility:hidden;transform:translateY(8px);
  transition:opacity .18s ease, transform .18s ease, visibility .18s ease;
}
.has-dropdown:hover .dropdown{opacity:1;visibility:visible;transform:translateY(0);}
.dropdown li a{display:block;padding:10px 20px;font-family:var(--font-body);font-size:.92rem;color:var(--charcoal);text-transform:none;letter-spacing:0;}
.dropdown li a:hover{background:var(--blue-pale);color:var(--blue);}

.nav-cta{display:flex;align-items:center;gap:12px;}
.nav-cta .call{font-family:var(--font-mono);font-weight:600;font-size:.95rem;color:var(--charcoal-dark);white-space:nowrap;}
.nav-cta .call span{display:block;font-size:.65rem;color:var(--steel);font-weight:400;letter-spacing:.08em;text-transform:uppercase;}

.menu-toggle{display:none;background:none;border:none;font-size:1.6rem;cursor:pointer;color:var(--charcoal-dark);}

/* ==========================================================================
   Gear-tooth divider (signature motif)
   ========================================================================== */
.gear-divider{width:100%;height:22px;display:block;line-height:0;}
.gear-divider svg{width:100%;height:100%;display:block;}
.flip{transform:rotate(180deg);}

/* ==========================================================================
   Hero
   ========================================================================== */
.hero{
  position:relative;
  background:radial-gradient(circle at 15% 20%, var(--blue-light) 0%, var(--blue) 38%, var(--charcoal-dark) 78%);
  color:var(--white);
  overflow:hidden;
  padding:100px 0 110px;
}
.hero::before{
  content:"";position:absolute;inset:0;
  background-image:radial-gradient(rgba(255,255,255,.05) 1px, transparent 1px);
  background-size:26px 26px;
  opacity:.5;
}
.hero .container{position:relative;display:grid;grid-template-columns:1.1fr .9fr;gap:48px;align-items:center;}
.hero-copy .eyebrow{color:var(--green);}
.hero h1{color:var(--white);font-size:clamp(2.2rem,4.4vw,3.4rem);}
.hero h1 em{font-style:normal;color:var(--green);}
.hero-copy p{color:#d9d5ea;font-size:1.12rem;max-width:520px;}
.hero-actions{display:flex;gap:16px;margin-top:28px;flex-wrap:wrap;}
.hero-stats{display:flex;gap:32px;margin-top:44px;flex-wrap:wrap;}
.hero-stats div{border-left:2px solid rgba(255,255,255,.25);padding-left:14px;}
.hero-stats strong{display:block;font-family:var(--font-display);font-size:1.7rem;color:var(--white);}
.hero-stats span{font-size:.78rem;color:#c9c2e3;text-transform:uppercase;letter-spacing:.06em;}

.hero-visual{position:relative;display:flex;align-items:center;justify-content:center;}
.gear-spin{animation:spin 22s linear infinite;transform-origin:center;}
.fan-spin{animation:spin 6s linear infinite;transform-origin:center;}
@keyframes spin{from{transform:rotate(0deg);}to{transform:rotate(360deg);}}
@media (prefers-reduced-motion:reduce){
  .gear-spin,.fan-spin{animation:none;}
}

/* ==========================================================================
   Breadcrumb
   ========================================================================== */
.breadcrumb-bar{background:var(--paper);border-bottom:1px solid var(--line);}
.breadcrumb-bar .container{padding-top:14px;padding-bottom:14px;}
.breadcrumb{font-family:var(--font-mono);font-size:.8rem;color:var(--steel);display:flex;gap:8px;flex-wrap:wrap;}
.breadcrumb a:hover{color:var(--blue);}
.breadcrumb .sep{color:var(--steel-light);}
.breadcrumb .current{color:var(--charcoal-dark);}

/* ==========================================================================
   Page header (inner pages)
   ========================================================================== */
.page-hero{background:var(--charcoal-dark);color:var(--white);padding:56px 0;position:relative;overflow:hidden;}
.page-hero::after{
  content:"";position:absolute;right:-60px;top:-60px;width:260px;height:260px;
  border:2px solid rgba(255,255,255,.06);border-radius:50%;
}
.page-hero .eyebrow{color:var(--green);}
.page-hero h1{color:var(--white);font-size:clamp(1.9rem,3.6vw,2.6rem);margin-bottom:10px;}
.page-hero p{color:#c9c2e3;max-width:640px;margin:0;}

/* ==========================================================================
   Cards, Products
   ========================================================================== */
.grid{display:grid;gap:28px;}
.grid-3{grid-template-columns:repeat(3,1fr);}
.grid-4{grid-template-columns:repeat(4,1fr);}
.grid-2{grid-template-columns:repeat(2,1fr);}

.card{
  background:var(--white);border:1px solid var(--line);border-radius:var(--radius);
  padding:32px 26px;transition:transform .18s ease, box-shadow .18s ease, border-color .18s ease;
  display:flex;flex-direction:column;height:100%;
}
.card:hover{transform:translateY(-6px);box-shadow:var(--shadow-md);border-color:transparent;}
.card .icon{width:56px;height:56px;margin-bottom:18px;color:var(--blue);}
.card h3{font-size:1.15rem;margin-bottom:10px;}
.card p{font-size:.95rem;flex-grow:1;}
.card a.card-link{
  margin-top:14px;font-family:var(--font-mono);font-size:.82rem;text-transform:uppercase;
  letter-spacing:.06em;color:var(--blue);display:inline-flex;align-items:center;gap:6px;
}
.card a.card-link:hover{color:var(--green-dark);}

.product-card{position:relative;border-top:3px solid var(--green);}

/* Industry chips */
.chip-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:18px;}
.chip{
  background:var(--paper);border:1px solid var(--line);border-radius:var(--radius);
  padding:22px 16px;text-align:center;font-family:var(--font-display);
  letter-spacing:.02em;text-transform:uppercase;font-size:.92rem;color:var(--charcoal-dark);
  transition:background .18s ease, color .18s ease;
}
.chip svg{width:34px;height:34px;margin:0 auto 12px;color:var(--blue);display:block;}
.chip:hover{background:var(--blue);color:var(--white);}
.chip:hover svg{color:var(--green);}

/* Why choose / features */
.feature-row{display:flex;gap:18px;padding:22px 0;border-bottom:1px solid var(--line);}
.feature-row:last-child{border-bottom:none;}
.feature-row .num{
  font-family:var(--font-mono);color:var(--green-dark);font-weight:700;font-size:1.1rem;flex-shrink:0;
}
.feature-row h4{margin-bottom:4px;font-size:1.05rem;}
.feature-row p{margin:0;font-size:.94rem;}

/* Split section */
.split{display:grid;grid-template-columns:1fr 1fr;gap:56px;align-items:center;}
.split-media{
  background:linear-gradient(145deg,var(--blue),var(--charcoal-dark));
  border-radius:var(--radius);min-height:360px;display:flex;align-items:center;justify-content:center;
  position:relative;overflow:hidden;
}
.split-media svg{width:64%;color:rgba(255,255,255,.92);}
.split-media::before{
  content:"";position:absolute;inset:0;
  background-image:radial-gradient(rgba(255,255,255,.06) 1px, transparent 1px);
  background-size:22px 22px;
}

.bg-dark{background:var(--charcoal-dark);color:var(--white);}
.bg-dark h2,.bg-dark h3,.bg-dark h4{color:var(--white);}
.bg-dark p{color:#c7c8ce;}
.bg-paper{background:var(--paper);}
.bg-blue{background:linear-gradient(120deg,var(--blue),var(--blue-light));color:var(--white);}
.bg-blue h2,.bg-blue h3{color:var(--white);}
.bg-blue p{color:#dceefc;}

/* CTA banner */
.cta-banner{text-align:center;padding:64px 0;}
.cta-banner h2{margin-bottom:10px;}
.cta-banner p{max-width:560px;margin:0 auto 28px;}
.cta-actions{display:flex;gap:16px;justify-content:center;flex-wrap:wrap;}

/* Specs table */
.spec-table{width:100%;border-collapse:collapse;margin:18px 0 28px;font-size:.95rem;}
.spec-table th,.spec-table td{text-align:left;padding:12px 16px;border-bottom:1px solid var(--line);}
.spec-table th{font-family:var(--font-mono);text-transform:uppercase;font-size:.78rem;letter-spacing:.06em;color:var(--steel);background:var(--paper);}

/* Applications list */
.check-list li{position:relative;padding-left:28px;margin-bottom:10px;color:var(--charcoal);}
.check-list li::before{
  content:"";position:absolute;left:0;top:6px;width:16px;height:16px;
  background:var(--green);clip-path:polygon(14% 44%, 0 65%, 50% 100%, 100% 16%, 80% 0%, 45% 62%);
}

/* Related products / internal linking strip */
.related-strip{background:var(--paper);border-top:1px solid var(--line);border-bottom:1px solid var(--line);}
.related-strip .tag-links{display:flex;flex-wrap:wrap;gap:10px;margin-top:16px;}
.related-strip .tag-links a{
  background:var(--white);border:1px solid var(--line);padding:9px 16px;border-radius:30px;
  font-family:var(--font-mono);font-size:.8rem;color:var(--charcoal);
}
.related-strip .tag-links a:hover{border-color:var(--blue);color:var(--blue);}

/* Contact page */
.contact-grid{display:grid;grid-template-columns:.9fr 1.1fr;gap:48px;}
.contact-info .item{display:flex;gap:16px;margin-bottom:26px;}
.contact-info .item .ic{
  width:46px;height:46px;flex-shrink:0;background:var(--blue-pale);color:var(--blue);
  border-radius:50%;display:flex;align-items:center;justify-content:center;
}
.contact-info .item h4{margin-bottom:2px;font-size:1rem;}
.contact-info .item p{margin:0;font-size:.95rem;}
.form-field{margin-bottom:18px;}
.form-field label{display:block;font-family:var(--font-mono);font-size:.78rem;text-transform:uppercase;letter-spacing:.05em;color:var(--steel);margin-bottom:6px;}
.form-field input,.form-field select,.form-field textarea{
  width:100%;padding:13px 14px;border:1px solid var(--line);border-radius:var(--radius);
  font-family:var(--font-body);font-size:.96rem;background:var(--white);color:var(--charcoal-dark);
}
.form-field input:focus,.form-field select:focus,.form-field textarea:focus{border-color:var(--blue);outline:none;}
.map-embed{border:1px solid var(--line);border-radius:var(--radius);overflow:hidden;margin-top:32px;}
.map-embed iframe{width:100%;height:320px;border:0;display:block;}

/* FAQ (AEO) */
.faq-item{border-bottom:1px solid var(--line);padding:20px 0;}
.faq-item summary{
  cursor:pointer;font-family:var(--font-display);text-transform:uppercase;letter-spacing:.02em;
  font-size:1rem;color:var(--charcoal-dark);list-style:none;display:flex;justify-content:space-between;align-items:center;
}
.faq-item summary::-webkit-details-marker{display:none;}
.faq-item summary::after{content:"+";font-size:1.4rem;color:var(--green-dark);}
.faq-item[open] summary::after{content:"–";}
.faq-item p{margin-top:12px;font-size:.96rem;}

/* Footer */
footer.site-footer{background:var(--charcoal-dark);color:#c9cad0;padding-top:64px;}
.footer-grid{display:grid;grid-template-columns:1.4fr 1fr 1fr 1.2fr;gap:36px;padding-bottom:48px;border-bottom:1px solid rgba(255,255,255,.08);}
.footer-brand img{height:48px;margin-bottom:16px;filter:brightness(0) invert(1);}
.footer-brand p{color:#9a9ba3;font-size:.92rem;}
footer h5{font-family:var(--font-display);color:var(--white);text-transform:uppercase;letter-spacing:.04em;font-size:.95rem;margin-bottom:18px;}
footer ul li{margin-bottom:10px;}
footer ul li a{color:#b7b8bf;font-size:.92rem;}
footer ul li a:hover{color:var(--green);}
.footer-bottom{display:flex;justify-content:space-between;align-items:center;padding:22px 0;font-size:.82rem;color:#8b8c94;flex-wrap:wrap;gap:10px;}
.footer-bottom a{color:#b7b8bf;}
.social-row{display:flex;gap:12px;}
.social-row a{
  width:38px;height:38px;border:1px solid rgba(255,255,255,.18);border-radius:50%;
  display:flex;align-items:center;justify-content:center;color:var(--white);
}
.social-row a:hover{background:var(--green);border-color:var(--green);color:var(--charcoal-dark);}

/* Floating contact buttons */
.float-actions{position:fixed;right:20px;bottom:20px;display:flex;flex-direction:column;gap:12px;z-index:200;}
.float-actions a{
  width:54px;height:54px;border-radius:50%;display:flex;align-items:center;justify-content:center;
  box-shadow:var(--shadow-lg);color:var(--white);
}
.float-actions .wa{background:#25D366;}
.float-actions .ph{background:var(--blue);}

/* Responsive */
@media (max-width:1024px){
  .hero .container{grid-template-columns:1fr;}
  .hero-visual{order:-1;max-width:280px;margin:0 auto;}
  .split{grid-template-columns:1fr;}
  .grid-4{grid-template-columns:repeat(2,1fr);}
  .grid-3{grid-template-columns:repeat(2,1fr);}
  .chip-grid{grid-template-columns:repeat(3,1fr);}
  .footer-grid{grid-template-columns:1fr 1fr;}
  .contact-grid{grid-template-columns:1fr;}
}
@media (max-width:860px){
  nav.main-nav{position:fixed;top:0;right:-100%;height:100vh;width:300px;background:var(--white);
    flex-direction:column;align-items:stretch;padding:90px 24px 24px;transition:right .25s ease;box-shadow:var(--shadow-lg);overflow-y:auto;}
  nav.main-nav.open{right:0;}
  nav.main-nav > ul{flex-direction:column;align-items:stretch;gap:0;}
  nav.main-nav > ul > li > a{border-bottom:1px solid var(--line);}
  .has-dropdown .dropdown{position:static;opacity:1;visibility:visible;transform:none;box-shadow:none;border-top:none;display:none;padding-left:12px;}
  .has-dropdown.open .dropdown{display:block;}
  .menu-toggle{display:block;}
  .nav-cta .call{display:none;}
}
@media (max-width:680px){
  .grid-4,.grid-3,.grid-2{grid-template-columns:1fr;}
  .chip-grid{grid-template-columns:repeat(2,1fr);}
  section{padding:52px 0;}
  .hero{padding:64px 0 76px;}
  .footer-grid{grid-template-columns:1fr;}
  .topbar .container{justify-content:center;text-align:center;}
}

/* ==========================================================================
   Blog
   ========================================================================== */
.post-card{padding:0;overflow:hidden;}
.post-card .post-thumb{width:100%;aspect-ratio:16/10;overflow:hidden;background:var(--paper);}
.post-thumb-img{width:100%;height:100%;object-fit:cover;display:block;}
.post-thumb-placeholder{
  width:100%;height:100%;display:flex;align-items:center;justify-content:center;
  background:linear-gradient(135deg,var(--blue),var(--charcoal-dark));color:rgba(255,255,255,.55);
}
.post-card > *:not(.post-thumb){padding-left:26px;padding-right:26px;}
.post-card h3{padding-top:18px;font-size:1.1rem;}
.post-card p{font-size:.92rem;}
.post-card .card-link{padding-bottom:26px;display:inline-flex;}
.post-meta{display:flex;align-items:center;gap:12px;padding-top:18px;font-family:var(--font-mono);font-size:.78rem;color:var(--steel);}
.tag-pill{
  background:var(--blue-pale);color:var(--blue);padding:4px 12px;border-radius:30px;
  font-family:var(--font-mono);font-size:.72rem;text-transform:uppercase;letter-spacing:.04em;
}
.post-date{color:var(--steel);}

.single-post-thumb{border-radius:var(--radius);overflow:hidden;margin-bottom:32px;}
.single-post-thumb img{width:100%;display:block;}

.entry-content{font-size:1.05rem;color:var(--charcoal);}
.entry-content p{color:var(--charcoal);margin-bottom:1.3em;}
.entry-content h2{font-size:1.5rem;margin-top:1.6em;text-transform:none;letter-spacing:0;}
.entry-content h3{font-size:1.2rem;margin-top:1.4em;text-transform:none;letter-spacing:0;}
.entry-content ul,.entry-content ol{margin:0 0 1.3em;padding-left:1.4em;color:var(--charcoal);}
.entry-content li{margin-bottom:.5em;}
.entry-content blockquote{
  border-left:3px solid var(--green);margin:1.6em 0;padding:.4em 0 .4em 1.4em;
  font-style:italic;color:var(--steel);
}
.entry-content img{border-radius:var(--radius);margin:1.4em 0;}
.entry-content strong{color:var(--charcoal-dark);}
.entry-content a{color:var(--blue);text-decoration:underline;}

.avs-pagination{display:flex;justify-content:center;gap:16px;margin-top:48px;}
.avs-pagination .nav-links{display:flex;gap:16px;}
.avs-pagination a,.avs-pagination span{
  font-family:var(--font-display);text-transform:uppercase;letter-spacing:.04em;font-size:.9rem;
  padding:10px 20px;border:1px solid var(--line);border-radius:var(--radius);color:var(--charcoal);
}
.avs-pagination a:hover{border-color:var(--blue);color:var(--blue);}
.avs-pagination .current{background:var(--charcoal-dark);color:var(--white);border-color:var(--charcoal-dark);}