/* ==========================================================================
   Royal Tech Engineering — Design System
   Premium industrial / engineering aesthetic
   ========================================================================== */

:root{
  --rt-navy-950:#0A1B2B;
  --rt-navy-900:#0F2A43;
  --rt-navy-800:#173A5C;
  --rt-navy-700:#204B74;
  --rt-teal-600:#0E7C86;
  --rt-teal-500:#12939F;
  --rt-orange-600:#E86A2C;
  --rt-orange-500:#F5793A;
  --rt-orange-400:#FF9257;
  --rt-ink:#14202B;
  --rt-body:#3C4A56;
  --rt-muted:#6B7A87;
  --rt-line:#E4E9ED;
  --rt-bg:#F7F9FB;
  --rt-white:#FFFFFF;
  --rt-success:#1E8E5A;
  --rt-radius-sm:8px;
  --rt-radius:14px;
  --rt-radius-lg:22px;
  --rt-shadow-sm:0 1px 2px rgba(15,42,67,0.06), 0 1px 1px rgba(15,42,67,0.04);
  --rt-shadow:0 8px 24px -8px rgba(15,42,67,0.16);
  --rt-shadow-lg:0 24px 48px -16px rgba(15,42,67,0.28);
  --rt-container:1240px;
}

*{box-sizing:border-box;}
html{scroll-behavior:smooth;}
body{
  margin:0;
  font-family:'Inter',system-ui,-apple-system,Segoe UI,Roboto,sans-serif;
  color:var(--rt-body);
  background:var(--rt-white);
  line-height:1.6;
  -webkit-font-smoothing:antialiased;
}
h1,h2,h3,h4,h5{
  font-family:'Manrope','Inter',sans-serif;
  color:var(--rt-ink);
  font-weight:800;
  line-height:1.15;
  margin:0 0 .5em;
  letter-spacing:-0.01em;
}
h1{font-size:clamp(2rem,4vw,3.2rem);}
h2{font-size:clamp(1.6rem,3vw,2.3rem);}
h3{font-size:1.25rem;}
p{margin:0 0 1em;}
a{color:inherit;text-decoration:none;}
img{max-width:100%;display:block;}
ul{margin:0;padding:0;list-style:none;}
.container{max-width:var(--rt-container);margin:0 auto;padding:0 20px;}
.section{padding:72px 0;}
@media(max-width:768px){.section{padding:48px 0;}}
.section-tight{padding:40px 0;}
.bg-navy{background:var(--rt-navy-900);color:#DCE6EE;}
.bg-navy h1,.bg-navy h2,.bg-navy h3{color:#fff;}
.bg-bg{background:var(--rt-bg);}
.eyebrow{
  display:inline-flex;align-items:center;gap:8px;
  font-size:.72rem;font-weight:700;letter-spacing:.12em;text-transform:uppercase;
  color:var(--rt-teal-600);margin-bottom:12px;
}
.eyebrow::before{content:"";width:22px;height:2px;background:var(--rt-orange-500);display:inline-block;}
.lede{font-size:1.1rem;color:var(--rt-muted);max-width:64ch;}

/* Buttons */
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:8px;
  padding:13px 24px;border-radius:10px;font-weight:700;font-size:.95rem;
  border:1px solid transparent;cursor:pointer;transition:.18s ease;white-space:nowrap;
}
.btn-primary{background:var(--rt-orange-500);color:#fff;box-shadow:var(--rt-shadow-sm);}
.btn-primary:hover{background:var(--rt-orange-600);transform:translateY(-1px);}
.btn-secondary{background:#fff;color:var(--rt-navy-900);border-color:var(--rt-line);}
.btn-secondary:hover{border-color:var(--rt-navy-700);}
.btn-whatsapp{background:#1DA851;color:#fff;}
.btn-whatsapp:hover{background:#178a41;}
.btn-outline-light{background:transparent;color:#fff;border-color:rgba(255,255,255,.35);}
.btn-outline-light:hover{border-color:#fff;background:rgba(255,255,255,.08);}
.btn-block{width:100%;}
.btn-sm{padding:9px 16px;font-size:.85rem;}

/* Header */
.site-header{
  position:sticky;top:0;z-index:100;background:rgba(255,255,255,.94);
  backdrop-filter:blur(10px);border-bottom:1px solid var(--rt-line);
}
.header-inner{display:flex;align-items:center;justify-content:space-between;padding:14px 20px;max-width:var(--rt-container);margin:0 auto;gap:20px;}
.brand{display:flex;align-items:center;gap:10px;font-family:'Manrope',sans-serif;font-weight:800;color:var(--rt-navy-900);font-size:1.05rem;}
.brand-mark{width:40px;height:40px;border-radius:10px;background:linear-gradient(135deg,var(--rt-navy-900),var(--rt-teal-600));display:flex;align-items:center;justify-content:center;color:#fff;font-weight:800;font-size:1.1rem;flex-shrink:0;}
.main-nav{display:flex;align-items:center;gap:2px;}
.main-nav>li{position:relative;}
.main-nav>li>a{display:flex;align-items:center;gap:4px;padding:10px 14px;font-weight:600;font-size:.92rem;color:var(--rt-navy-900);border-radius:8px;}
.main-nav>li>a:hover{background:var(--rt-bg);}
.dropdown{
  position:absolute;top:100%;left:0;background:#fff;border:1px solid var(--rt-line);
  border-radius:var(--rt-radius);box-shadow:var(--rt-shadow-lg);min-width:280px;padding:10px;
  opacity:0;visibility:hidden;transform:translateY(6px);transition:.16s ease;
}
.main-nav>li:hover .dropdown{opacity:1;visibility:visible;transform:translateY(0);}
.dropdown a{display:block;padding:9px 12px;border-radius:8px;font-size:.88rem;color:var(--rt-body);font-weight:600;}
.dropdown a:hover{background:var(--rt-bg);color:var(--rt-navy-900);}
.dropdown .grp-label{font-size:.68rem;text-transform:uppercase;letter-spacing:.08em;color:var(--rt-muted);padding:8px 12px 4px;font-weight:700;}
.header-cta{display:flex;align-items:center;gap:10px;}
.icon-btn{width:40px;height:40px;border-radius:9px;display:flex;align-items:center;justify-content:center;border:1px solid var(--rt-line);color:var(--rt-navy-900);}
.icon-btn:hover{border-color:var(--rt-teal-600);color:var(--rt-teal-600);}
.mobile-toggle{display:none;background:none;border:1px solid var(--rt-line);border-radius:8px;width:42px;height:42px;align-items:center;justify-content:center;}
.mobile-nav{display:none;background:#fff;border-top:1px solid var(--rt-line);}
.mobile-nav.open{display:block;}
.mobile-nav .container{padding:14px 20px 24px;}
.mobile-nav details{border-bottom:1px solid var(--rt-line);padding:10px 0;}
.mobile-nav summary{font-weight:700;color:var(--rt-navy-900);cursor:pointer;list-style:none;}
.mobile-nav summary::-webkit-details-marker{display:none;}
.mobile-nav a{display:block;padding:8px 0;font-weight:600;color:var(--rt-navy-900);}
.mobile-nav .sub a{padding-left:12px;font-weight:500;color:var(--rt-body);font-size:.93rem;}
@media(max-width:980px){
  .main-nav,.header-cta .btn{display:none;}
  .mobile-toggle{display:flex;}
  .header-cta{gap:8px;}
}

/* Hero */
.hero{position:relative;background:linear-gradient(160deg,var(--rt-navy-950) 0%,var(--rt-navy-900) 55%,var(--rt-navy-800) 100%);color:#fff;overflow:hidden;}
.hero::after{content:"";position:absolute;inset:0;background:radial-gradient(circle at 82% 20%, rgba(18,147,159,.35), transparent 55%);pointer-events:none;}
.hero-grid{display:grid;grid-template-columns:1.05fr .95fr;gap:48px;align-items:center;position:relative;z-index:1;padding:76px 0 64px;}
@media(max-width:960px){.hero-grid{grid-template-columns:1fr;padding:48px 0 40px;}}
.hero h1{color:#fff;}
.hero .lede{color:#B9C8D4;font-size:1.12rem;}
.hero-badges{display:flex;flex-wrap:wrap;gap:10px;margin:22px 0 28px;}
.hero-badge{display:flex;align-items:center;gap:8px;font-size:.82rem;font-weight:700;color:#DCE6EE;background:rgba(255,255,255,.06);border:1px solid rgba(255,255,255,.14);padding:8px 14px;border-radius:999px;}
.hero-cta{display:flex;flex-wrap:wrap;gap:12px;}
.hero-media{position:relative;border-radius:var(--rt-radius-lg);overflow:hidden;background:rgba(255,255,255,.05);border:1px solid rgba(255,255,255,.14);aspect-ratio:4/3;display:flex;align-items:center;justify-content:center;}
.media-placeholder{display:flex;flex-direction:column;align-items:center;gap:10px;color:#9FB3C1;text-align:center;padding:24px;}
.media-placeholder svg{opacity:.55;}

/* 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(--rt-line);border-radius:var(--rt-radius);overflow:hidden;transition:.2s ease;display:flex;flex-direction:column;}
.card:hover{box-shadow:var(--rt-shadow);transform:translateY(-3px);border-color:transparent;}
.card-media{aspect-ratio:4/3;background:var(--rt-bg);display:flex;align-items:center;justify-content:center;position:relative;overflow:hidden;}
.card-media img{width:100%;height:100%;object-fit:contain;}
.card-body{padding:22px;display:flex;flex-direction:column;gap:10px;flex:1;}
.card-body h3{margin:0;}
.tag{display:inline-flex;font-size:.7rem;font-weight:700;letter-spacing:.04em;text-transform:uppercase;color:var(--rt-teal-600);background:#E7F4F5;padding:4px 10px;border-radius:999px;align-self:flex-start;}
.card-foot{margin-top:auto;display:flex;gap:8px;flex-wrap:wrap;padding-top:6px;}

.product-card .spec-mini{display:grid;grid-template-columns:1fr 1fr;gap:4px 10px;font-size:.8rem;color:var(--rt-muted);margin:4px 0;}
.product-card .spec-mini b{color:var(--rt-ink);font-weight:700;}

/* Category hero band */
.cat-hero{background:var(--rt-bg);border-bottom:1px solid var(--rt-line);padding:40px 0;}
.breadcrumb{display:flex;flex-wrap:wrap;gap:6px;font-size:.82rem;color:var(--rt-muted);margin-bottom:14px;}
.breadcrumb a{color:var(--rt-teal-600);font-weight:600;}
.quick-answer{background:#fff;border:1px solid var(--rt-line);border-left:4px solid var(--rt-teal-600);border-radius:var(--rt-radius-sm);padding:18px 20px;font-size:.95rem;color:var(--rt-body);margin-top:18px;}
.quick-answer strong{color:var(--rt-ink);}

/* Table */
.spec-table{width:100%;border-collapse:collapse;font-size:.92rem;}
.spec-table tr{border-bottom:1px solid var(--rt-line);}
.spec-table td{padding:11px 14px;}
.spec-table td:first-child{color:var(--rt-muted);font-weight:600;width:42%;}
.spec-table td:last-child{color:var(--rt-ink);font-weight:600;}
.spec-table tr:nth-child(odd){background:var(--rt-bg);}

/* FAQ */
.faq-item{border-bottom:1px solid var(--rt-line);padding:16px 0;}
.faq-item summary{cursor:pointer;font-weight:700;color:var(--rt-ink);list-style:none;display:flex;justify-content:space-between;align-items:center;gap:10px;}
.faq-item summary::-webkit-details-marker{display:none;}
.faq-item summary::after{content:"+";font-size:1.4rem;color:var(--rt-teal-600);font-weight:400;flex-shrink:0;}
.faq-item[open] summary::after{content:"–";}
.faq-item p{margin-top:10px;color:var(--rt-body);}

/* Steps */
.steps{display:grid;grid-template-columns:repeat(5,1fr);gap:16px;}
@media(max-width:900px){.steps{grid-template-columns:repeat(2,1fr);}}
.step{background:#fff;border:1px solid var(--rt-line);border-radius:var(--rt-radius);padding:18px;text-align:center;}
.step-num{width:34px;height:34px;border-radius:50%;background:var(--rt-teal-600);color:#fff;display:flex;align-items:center;justify-content:center;font-weight:800;margin:0 auto 10px;}

/* Forms */
.form-card{background:#fff;border:1px solid var(--rt-line);border-radius:var(--rt-radius-lg);padding:28px;box-shadow:var(--rt-shadow);}
.form-row{display:grid;grid-template-columns:1fr 1fr;gap:14px;margin-bottom:14px;}
@media(max-width:600px){.form-row{grid-template-columns:1fr;}}
.field label{display:block;font-size:.82rem;font-weight:700;color:var(--rt-ink);margin-bottom:6px;}
.field input,.field select,.field textarea{
  width:100%;padding:11px 13px;border:1px solid var(--rt-line);border-radius:9px;font-size:.92rem;
  font-family:inherit;background:#fcfdfe;color:var(--rt-ink);
}
.field input:focus,.field select:focus,.field textarea:focus{outline:2px solid var(--rt-teal-500);outline-offset:1px;border-color:var(--rt-teal-500);}
.field-full{grid-column:1/-1;}

/* Footer */
.site-footer{background:var(--rt-navy-950);color:#9FB3C1;}
.footer-top{padding:56px 0 32px;display:grid;grid-template-columns:1.4fr 1fr 1fr 1.2fr;gap:32px;}
@media(max-width:900px){.footer-top{grid-template-columns:1fr 1fr;}}
@media(max-width:560px){.footer-top{grid-template-columns:1fr;}}
.site-footer h4{color:#fff;font-size:.85rem;text-transform:uppercase;letter-spacing:.08em;margin-bottom:16px;}
.site-footer a{color:#9FB3C1;font-size:.9rem;display:block;padding:5px 0;}
.site-footer a:hover{color:#fff;}
.footer-bottom{border-top:1px solid rgba(255,255,255,.08);padding:20px 0;font-size:.82rem;display:flex;justify-content:space-between;flex-wrap:wrap;gap:10px;}
.social-row{display:flex;gap:10px;margin-top:14px;}
.social-row a{width:36px;height:36px;border-radius:8px;background:rgba(255,255,255,.06);display:flex;align-items:center;justify-content:center;padding:0;}

/* Floating CTAs */
.float-stack{position:fixed;right:18px;bottom:18px;display:flex;flex-direction:column;gap:10px;z-index:200;}
.float-btn{width:54px;height:54px;border-radius:50%;display:flex;align-items:center;justify-content:center;box-shadow:var(--rt-shadow-lg);color:#fff;}
.float-btn.wa{background:#25D366;}
.float-btn.call{background:var(--rt-navy-900);}
.float-btn.quote{background:var(--rt-orange-500);width:auto;border-radius:999px;padding:0 20px;font-weight:700;font-size:.85rem;gap:8px;}
@media(max-width:640px){.float-btn.quote span{display:none;}.float-btn.quote{width:54px;padding:0;}}

/* Utility */
.text-center{text-align:center;margin-left:auto;margin-right:auto;}
.mt-0{margin-top:0;}
.mb-0{margin-bottom:0;}
.divider{height:1px;background:var(--rt-line);margin:48px 0;}
.pill-row{display:flex;flex-wrap:wrap;gap:10px;}
.pill{border:1px solid var(--rt-line);border-radius:999px;padding:8px 16px;font-size:.85rem;font-weight:600;color:var(--rt-navy-900);background:#fff;cursor:pointer;}
.pill.active{background:var(--rt-navy-900);color:#fff;border-color:var(--rt-navy-900);}
.stat-row{display:grid;grid-template-columns:repeat(4,1fr);gap:20px;}
@media(max-width:700px){.stat-row{grid-template-columns:repeat(2,1fr);}}
.stat b{display:block;font-size:1.8rem;color:var(--rt-navy-900);font-family:'Manrope',sans-serif;}
.stat span{font-size:.85rem;color:var(--rt-muted);}
.placeholder-note{font-size:.78rem;color:var(--rt-orange-600);background:#FFF3EA;border:1px dashed var(--rt-orange-500);padding:8px 12px;border-radius:8px;display:inline-block;margin-top:8px;}
.skeleton{background:linear-gradient(90deg,#EEF2F5 25%,#E4E9ED 37%,#EEF2F5 63%);background-size:400% 100%;animation:shimmer 1.4s infinite;border-radius:8px;}
@keyframes shimmer{0%{background-position:100% 50%}100%{background-position:0 50%}}
.applications-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:14px;}
@media(max-width:900px){.applications-grid{grid-template-columns:repeat(3,1fr);}}
@media(max-width:600px){.applications-grid{grid-template-columns:repeat(2,1fr);}}
.app-chip{background:#fff;border:1px solid var(--rt-line);border-radius:var(--rt-radius-sm);padding:16px 14px;display:flex;flex-direction:column;align-items:flex-start;gap:8px;font-weight:700;font-size:.88rem;color:var(--rt-ink);}
.app-chip svg{color:var(--rt-teal-600);}
.brand-logo {
  width: 50px;
  height: 50px;
  object-fit: contain;
  display: block;
}