/* ═══════════════════════════════════════════════════════════════
   WCT (S) Systems Pte Ltd — bcair.com.sg
   Brand: modern industrial engineering blue + safety-orange CTA
   ═══════════════════════════════════════════════════════════════ */

:root{
  --blue:#0B4A82;        /* primary engineering blue */
  --blue-dark:#082F52;   /* navy */
  --blue-deep:#06243F;   /* hero backdrop */
  --blue-bright:#1C7FD6; /* bright accent */
  --orange:#FF6A1A;      /* safety-orange CTA */
  --orange-dark:#E0540B;
  --steel:#5A6B7B;       /* muted text */
  --line:#E2E9F0;        /* borders */
  --bg:#FFFFFF;
  --bg-soft:#F4F8FC;     /* soft panels */
  --bg-tint:#EAF2FA;
  --ink:#13212E;         /* headings */
  --body:#3A4956;        /* body text */
  --radius:10px;
  --shadow:0 10px 30px rgba(8,47,82,.08);
  --shadow-lg:0 24px 60px rgba(8,47,82,.16);
  --maxw:1160px;
}

*{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth;-webkit-text-size-adjust:100%}
body{
  font-family:'Inter Tight',system-ui,-apple-system,Segoe UI,Roboto,sans-serif;
  color:var(--body);background:var(--bg);line-height:1.65;font-size:17px;
  -webkit-font-smoothing:antialiased;overflow-x:hidden;
}
h1,h2,h3,h4{font-family:'Archivo',sans-serif;color:var(--ink);line-height:1.15;font-weight:700;letter-spacing:-.01em}
h1{font-size:clamp(2.1rem,5vw,3.4rem);font-weight:800}
h2{font-size:clamp(1.7rem,3.4vw,2.5rem)}
h3{font-size:1.3rem}
p{margin-bottom:1rem}
a{color:var(--blue);text-decoration:none;transition:color .15s}
a:hover{color:var(--orange)}
img{max-width:100%;display:block}
.container{max-width:var(--maxw);margin:0 auto;padding:0 24px}
section{padding:84px 0}

/* ─── Topbar ─── */
.topbar{background:var(--blue-deep);color:#cfe0ef;font-size:13.5px}
.topbar-inner{display:flex;justify-content:space-between;align-items:center;height:38px}
.topbar-item{letter-spacing:.04em;font-weight:500}
.topbar-links a{color:#cfe0ef;margin-left:18px;font-weight:500}
.topbar-links a:hover{color:#fff}
@media(max-width:680px){.topbar-item{display:none}.topbar-links a:first-child{margin-left:0}}

/* ─── Header ─── */
.site-header{position:sticky;top:0;z-index:50;background:rgba(255,255,255,.96);backdrop-filter:blur(10px);border-bottom:1px solid var(--line);transition:box-shadow .2s}
.site-header.scrolled{box-shadow:0 6px 24px rgba(8,47,82,.08)}
.header-inner{display:flex;align-items:center;justify-content:space-between;height:72px}
.brand-lockup{display:flex;align-items:center;gap:12px}
.brand{display:flex;align-items:center;gap:11px}
.header-logo{height:44px;width:auto;max-width:230px;object-fit:contain;display:block}
.backed-by{font-family:'Inter Tight',sans-serif;font-size:11px;line-height:1.25;color:var(--steel);font-weight:600;letter-spacing:.02em;white-space:nowrap;padding-left:12px;border-left:1px solid #d7dee6}
.backed-by strong{display:block;color:var(--blue);font-weight:800}
@media(max-width:600px){.backed-by{display:none}}
.brand-text{display:flex;flex-direction:column;line-height:1;font-family:'Archivo',sans-serif}
.brand-text strong{color:var(--blue);font-size:22px;font-weight:800;letter-spacing:.02em}
.brand-text span{color:var(--steel);font-size:12px;font-weight:600;letter-spacing:.12em;text-transform:uppercase;margin-top:2px}
.nav-links{display:flex;align-items:center;gap:28px}
.nav-links a{color:var(--ink);font-weight:600;font-size:15.5px}
.nav-links a:hover{color:var(--blue)}
.nav-cta{background:var(--orange);color:#fff!important;padding:10px 20px;border-radius:8px;box-shadow:0 6px 16px rgba(255,106,26,.28)}
.nav-cta:hover{background:var(--orange-dark);color:#fff!important}
.mobile-toggle{display:none;background:none;border:none;font-size:26px;color:var(--blue);cursor:pointer}
@media(max-width:900px){
  .mobile-toggle{display:block}
  .nav-links{position:absolute;top:72px;left:0;right:0;flex-direction:column;gap:0;background:#fff;border-bottom:1px solid var(--line);max-height:0;overflow:hidden;transition:max-height .3s}
  .nav-links.open{max-height:480px}
  .nav-links a{width:100%;padding:15px 24px;border-top:1px solid var(--line)}
  .nav-cta{margin:14px 24px;text-align:center;border-radius:8px}
}

/* ─── Buttons ─── */
.btn{display:inline-block;padding:14px 28px;border-radius:9px;font-weight:700;font-size:16px;cursor:pointer;border:none;transition:transform .12s,box-shadow .2s,background .2s;font-family:'Inter Tight',sans-serif}
.btn-primary{background:var(--orange);color:#fff;box-shadow:0 10px 24px rgba(255,106,26,.32)}
.btn-primary:hover{background:var(--orange-dark);color:#fff;transform:translateY(-2px)}
.btn-blue{background:var(--blue);color:#fff;box-shadow:0 10px 24px rgba(11,74,130,.28)}
.btn-blue:hover{background:var(--blue-dark);color:#fff;transform:translateY(-2px)}
.btn-ghost{background:transparent;color:#fff;border:1.5px solid rgba(255,255,255,.5)}
.btn-ghost:hover{background:rgba(255,255,255,.12);color:#fff;border-color:#fff}
.btn-outline{background:#fff;color:var(--blue);border:1.5px solid var(--line)}
.btn-outline:hover{border-color:var(--blue);color:var(--blue);transform:translateY(-2px)}

/* ─── Hero ─── */
.hero{position:relative;background:linear-gradient(135deg,var(--blue-deep) 0%,var(--blue-dark) 55%,var(--blue) 100%);color:#fff;padding:96px 0 92px;overflow:hidden}
.hero::after{content:"";position:absolute;inset:0;background:
  radial-gradient(circle at 85% 15%,rgba(28,127,214,.35),transparent 45%),
  radial-gradient(circle at 10% 90%,rgba(255,106,26,.18),transparent 40%);
  pointer-events:none}
.hero .container{position:relative;z-index:2;max-width:880px}
.hero .eyebrow{display:inline-block;background:rgba(255,255,255,.12);border:1px solid rgba(255,255,255,.2);color:#dbeaf7;padding:7px 16px;border-radius:30px;font-size:13px;font-weight:600;letter-spacing:.08em;text-transform:uppercase;margin-bottom:22px}
.hero h1{color:#fff;margin-bottom:20px;max-width:18ch}
.hero h1 em{color:#ffb27d;font-style:normal}
.hero p.lead{font-size:clamp(1.05rem,2vw,1.3rem);color:#c9dcec;max-width:60ch;margin-bottom:32px}
.hero-cta{display:flex;gap:14px;flex-wrap:wrap}
.hero-stats{display:flex;gap:40px;margin-top:48px;flex-wrap:wrap}
.hero-stat strong{display:block;font-family:'Archivo';font-size:2.1rem;font-weight:800;color:#fff;line-height:1}
.hero-stat span{font-size:13.5px;color:#a9c4dc;letter-spacing:.03em}

/* ─── Trust strip ─── */
.trust{background:var(--bg-soft);border-bottom:1px solid var(--line);padding:26px 0}
.trust-inner{display:flex;justify-content:center;gap:46px;flex-wrap:wrap;align-items:center}
.trust-item{display:flex;align-items:center;gap:10px;color:var(--steel);font-weight:600;font-size:15px}
.trust-item svg{width:22px;height:22px;fill:var(--blue)}

/* ─── Section heading ─── */
.section-head{max-width:720px;margin:0 auto 56px;text-align:center}
.section-head.left{margin-left:0;text-align:left}
.section-head .eyebrow{color:var(--orange);font-weight:700;font-size:13px;letter-spacing:.14em;text-transform:uppercase;margin-bottom:12px;display:block}
.section-head p{color:var(--steel);font-size:1.08rem;margin-top:14px}
.bg-soft{background:var(--bg-soft)}

/* ─── Service / feature cards ─── */
.grid{display:grid;gap:24px}
.grid-3{grid-template-columns:repeat(3,1fr)}
.grid-2{grid-template-columns:repeat(2,1fr)}
.grid-4{grid-template-columns:repeat(4,1fr)}
@media(max-width:900px){.grid-3,.grid-4{grid-template-columns:repeat(2,1fr)}}
@media(max-width:620px){.grid-2,.grid-3,.grid-4{grid-template-columns:1fr}}

.card{background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:30px;transition:transform .18s,box-shadow .18s,border-color .18s;height:100%}
.card:hover{transform:translateY(-4px);box-shadow:var(--shadow);border-color:#cfe0ef}
.card .icon{width:54px;height:54px;border-radius:12px;background:var(--bg-tint);display:flex;align-items:center;justify-content:center;margin-bottom:18px;font-size:26px}
.card h3{margin-bottom:10px}
.card p{color:var(--steel);font-size:15.5px;margin-bottom:14px}
.card a.more{font-weight:700;font-size:14.5px;color:var(--blue);display:inline-flex;align-items:center;gap:5px}
.card a.more:hover{color:var(--orange);gap:9px}
.card.feature{border-top:3px solid var(--orange)}

/* ─── Split / about ─── */
.split{display:grid;grid-template-columns:1fr 1fr;gap:56px;align-items:center}
@media(max-width:860px){.split{grid-template-columns:1fr;gap:34px}}
.split .media{border-radius:var(--radius);overflow:hidden;box-shadow:var(--shadow);min-height:320px;background:linear-gradient(135deg,var(--blue),var(--blue-bright));display:flex;align-items:center;justify-content:center;color:#fff;font-family:'Archivo';font-size:1.4rem;text-align:center;padding:30px}
.checklist{list-style:none;margin:18px 0}
.checklist li{position:relative;padding-left:32px;margin-bottom:13px;color:var(--body)}
.checklist li::before{content:"✓";position:absolute;left:0;top:0;width:22px;height:22px;background:var(--bg-tint);color:var(--blue);border-radius:50%;display:flex;align-items:center;justify-content:center;font-weight:800;font-size:12px}

/* ─── Process steps ─── */
.steps{display:grid;grid-template-columns:repeat(4,1fr);gap:24px;counter-reset:step}
@media(max-width:900px){.steps{grid-template-columns:repeat(2,1fr)}}
@media(max-width:560px){.steps{grid-template-columns:1fr}}
.step{position:relative;padding:28px 24px;background:#fff;border:1px solid var(--line);border-radius:var(--radius)}
.step::before{counter-increment:step;content:"0" counter(step);font-family:'Archivo';font-weight:800;font-size:2.4rem;color:var(--bg-tint);position:absolute;top:14px;right:18px;line-height:1}
.step h3{font-size:1.12rem;margin-bottom:8px;position:relative;z-index:1}
.step p{font-size:14.5px;color:var(--steel);margin:0}

/* ─── CTA band ─── */
.cta-band{background:linear-gradient(120deg,var(--blue-dark),var(--blue));color:#fff;border-radius:16px;padding:54px;text-align:center;box-shadow:var(--shadow-lg)}
.cta-band h2{color:#fff;margin-bottom:12px}
.cta-band p{color:#cfe0ef;max-width:54ch;margin:0 auto 26px}
.cta-band .hero-cta{justify-content:center}

/* ─── Products list ─── */
.product-card{background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:26px;transition:.18s}
.product-card:hover{box-shadow:var(--shadow);transform:translateY(-3px)}
.product-card .tag{display:inline-block;background:var(--bg-tint);color:var(--blue);font-size:11.5px;font-weight:700;letter-spacing:.08em;text-transform:uppercase;padding:4px 10px;border-radius:6px;margin-bottom:14px}
.product-card h3{font-size:1.18rem;margin-bottom:8px}
.product-card p{font-size:15px;color:var(--steel);margin:0}

/* ─── FAQ ─── */
.faq-item{border:1px solid var(--line);border-radius:var(--radius);margin-bottom:14px;background:#fff;overflow:hidden}
.faq-item summary{cursor:pointer;padding:20px 24px;font-weight:700;color:var(--ink);font-family:'Archivo';list-style:none;display:flex;justify-content:space-between;align-items:center;gap:16px}
.faq-item summary::-webkit-details-marker{display:none}
.faq-item summary::after{content:"+";font-size:1.5rem;color:var(--orange);font-weight:700;transition:transform .2s}
.faq-item[open] summary::after{transform:rotate(45deg)}
.faq-item .faq-body{padding:0 24px 22px;color:var(--steel);font-size:15.5px}

/* ─── Page hero (interior) ─── */
.page-hero{background:linear-gradient(130deg,var(--blue-deep),var(--blue-dark));color:#fff;padding:70px 0 60px}
.page-hero .breadcrumb{font-size:13.5px;color:#9fc0db;margin-bottom:16px}
.page-hero .breadcrumb a{color:#9fc0db}
.page-hero .breadcrumb a:hover{color:#fff}
.page-hero h1{color:#fff;max-width:20ch;margin-bottom:14px}
.page-hero p{color:#c9dcec;max-width:62ch;font-size:1.1rem}

/* ─── Prose (service & blog body) ─── */
.prose{max-width:760px;margin:0 auto}
.prose h2{margin:38px 0 14px;font-size:1.7rem}
.prose h3{margin:26px 0 10px;font-size:1.25rem}
.prose p{margin-bottom:16px}
.prose ul,.prose ol{margin:0 0 18px 22px}
.prose li{margin-bottom:8px}
.prose strong{color:var(--ink)}
.prose a{border-bottom:1px solid rgba(11,74,130,.3)}
.prose blockquote{border-left:3px solid var(--orange);padding:6px 22px;margin:22px 0;color:var(--steel);font-style:italic;background:var(--bg-soft);border-radius:0 8px 8px 0}

/* ─── Forms ─── */
.form-wrap{background:#fff;border:1px solid var(--line);border-radius:14px;padding:34px;box-shadow:var(--shadow)}
.form-row{display:grid;grid-template-columns:1fr 1fr;gap:18px}
@media(max-width:600px){.form-row{grid-template-columns:1fr}}
.field{margin-bottom:18px}
.field label{display:block;font-weight:600;font-size:14.5px;color:var(--ink);margin-bottom:7px}
.field label .req{color:var(--orange)}
.field input,.field select,.field textarea{width:100%;padding:12px 14px;border:1px solid var(--line);border-radius:9px;font-size:15.5px;font-family:inherit;color:var(--ink);background:#fff;transition:border .15s,box-shadow .15s}
.field input:focus,.field select:focus,.field textarea:focus{outline:none;border-color:var(--blue-bright);box-shadow:0 0 0 3px rgba(28,127,214,.15)}
.field textarea{min-height:120px;resize:vertical}
.field .hint{font-size:13px;color:var(--steel);margin-top:5px}
.hp{position:absolute;left:-9999px;opacity:0}
.form-note{font-size:13.5px;color:var(--steel);margin-top:14px}
.alert{padding:16px 18px;border-radius:10px;margin-bottom:20px;font-weight:600}
.alert-success{background:#e7f7ec;color:#1a7a3e;border:1px solid #b8e6c6}
.alert-error{background:#fdeaea;color:#b3261e;border:1px solid #f3c2bf}

/* ─── Footer ─── */
.site-footer{background:var(--blue-deep);color:#aac4da;padding:60px 0 30px;font-size:15px}
.footer-grid{display:grid;grid-template-columns:2fr 1fr 1fr 1.3fr;gap:40px;padding-bottom:40px;border-bottom:1px solid rgba(255,255,255,.1)}
@media(max-width:860px){.footer-grid{grid-template-columns:1fr 1fr}}
@media(max-width:520px){.footer-grid{grid-template-columns:1fr}}
.footer-logo{display:flex;align-items:center;gap:10px;margin-bottom:16px;font-family:'Archivo';font-size:19px;color:#fff}
.footer-logo img{border-radius:7px}
.footer-logo strong{color:#fff}
.footer-brand p{color:#9fbad2;font-size:14.5px;max-width:42ch}
.footer-compliance{color:#7fa3c2!important;font-size:13px!important;font-weight:600;letter-spacing:.04em}
.footer-col h4{color:#fff;font-size:14px;letter-spacing:.08em;text-transform:uppercase;margin-bottom:16px;font-family:'Archivo'}
.footer-col a{display:block;color:#aac4da;margin-bottom:11px;font-size:14.5px}
.footer-col a:hover{color:#fff}
.footer-addr{display:block;color:#9fbad2;margin-top:8px;font-size:14px}
.footer-bottom{padding-top:24px;text-align:center;color:#7fa3c2;font-size:13.5px}
.footer-bottom span{color:#cfe0ef}
.footer-bottom a{color:#9fbad2}
.footer-bottom a:hover{color:#fff}

/* ─── Floating WhatsApp ─── */
.wa-float{position:fixed;bottom:22px;right:22px;z-index:60;background:#25D366;color:#fff;display:flex;align-items:center;gap:9px;padding:13px 20px;border-radius:40px;font-weight:700;font-size:15px;box-shadow:0 10px 28px rgba(37,211,102,.4)}
.wa-float:hover{color:#fff;transform:translateY(-2px);box-shadow:0 14px 34px rgba(37,211,102,.5)}
.wa-float svg{width:22px;height:22px;fill:#fff}
@media(max-width:560px){.wa-float span,.wa-float{font-size:0}.wa-float{padding:15px;gap:0}.wa-float svg{width:26px;height:26px}}

/* ─── Reveal animation ─── */
.reveal{opacity:0;transform:translateY(22px);transition:opacity .6s ease,transform .6s ease}
.reveal.visible{opacity:1;transform:none}

/* ─── Blog ─── */
.blog-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:28px}
@media(max-width:900px){.blog-grid{grid-template-columns:repeat(2,1fr)}}
@media(max-width:620px){.blog-grid{grid-template-columns:1fr}}
.blog-card{background:#fff;border:1px solid var(--line);border-radius:var(--radius);overflow:hidden;transition:.18s;display:flex;flex-direction:column}
.blog-card:hover{box-shadow:var(--shadow);transform:translateY(-3px)}
.blog-card .thumb{aspect-ratio:16/9;background:linear-gradient(135deg,var(--blue),var(--blue-bright));overflow:hidden}
.blog-card .thumb img{width:100%;height:100%;object-fit:cover}
.blog-card .body{padding:22px;flex:1;display:flex;flex-direction:column}
.blog-card .cat{font-size:11.5px;font-weight:700;letter-spacing:.08em;text-transform:uppercase;color:var(--orange);margin-bottom:9px}
.blog-card h3{font-size:1.16rem;margin-bottom:9px;line-height:1.25}
.blog-card h3 a{color:var(--ink)}
.blog-card h3 a:hover{color:var(--blue)}
.blog-card p{font-size:14.5px;color:var(--steel);margin-bottom:14px;flex:1}
.blog-card .meta{font-size:13px;color:var(--steel);border-top:1px solid var(--line);padding-top:12px}
.post-hero-img{width:100%;max-height:420px;object-fit:cover;border-radius:14px;margin:24px 0}

/* ─── Portfolio / Our Work ─── */
.project{padding:30px 0;border-top:1px solid var(--line)}
.project:first-child{border-top:none;padding-top:8px}
.project-head{display:flex;align-items:flex-start;justify-content:space-between;gap:16px;flex-wrap:wrap}
.project-head h2{font-size:1.5rem;margin:0}
.project-meta{color:var(--steel);font-size:14.5px;margin:2px 0 0}
.project-tag{font-size:12px;font-weight:700;letter-spacing:.04em;text-transform:uppercase;padding:6px 12px;border-radius:999px;white-space:nowrap}
.tag-install{background:rgba(11,74,130,.10);color:var(--blue)}
.tag-clean{background:rgba(255,106,26,.12);color:var(--orange-dark)}
.project-blurb{color:var(--steel);max-width:760px;margin:10px 0 18px}
.project-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:12px}
.project-photo{display:block;border-radius:12px;overflow:hidden;background:#0e1216;aspect-ratio:4/3;box-shadow:0 4px 14px rgba(6,36,63,.10)}
.project-photo img{width:100%;height:100%;object-fit:cover;display:block;transition:transform .35s ease}
.project-photo:hover img{transform:scale(1.05)}
@media(max-width:760px){.project-grid{grid-template-columns:repeat(2,1fr)}}
@media(max-width:430px){.project-grid{grid-template-columns:1fr 1fr;gap:8px}}

/* Lightbox */
.lightbox{position:fixed;inset:0;background:rgba(6,12,20,.92);z-index:2000;display:none;align-items:center;justify-content:center}
.lightbox.open{display:flex}
.lightbox-img{max-width:92vw;max-height:88vh;border-radius:8px;box-shadow:0 20px 60px rgba(0,0,0,.5)}
.lightbox button{position:absolute;background:rgba(255,255,255,.12);color:#fff;border:none;cursor:pointer;border-radius:50%;width:48px;height:48px;font-size:24px;line-height:1;display:flex;align-items:center;justify-content:center;transition:background .15s}
.lightbox button:hover{background:rgba(255,255,255,.28)}
.lightbox-close{top:20px;right:20px}
.lightbox-prev{left:20px}
.lightbox-next{right:20px}
@media(max-width:560px){.lightbox-prev{left:8px}.lightbox-next{right:8px}.lightbox button{width:40px;height:40px;font-size:20px}}

/* ─── Utility ─── */
.text-center{text-align:center}
.mt-0{margin-top:0}.mb-0{margin-bottom:0}
.mt-32{margin-top:32px}
.lead{font-size:1.15rem;color:var(--steel)}
.divider{height:1px;background:var(--line);margin:0}