/* =====================================================
   SkyvoltFPV B2B Website - Main Stylesheet
   ===================================================== */
:root{
  --navy:#0b2545; --navy2:#13315c; --blue:#1d4e89; --accent:#f5a623;
  --text:#1a2332; --muted:#5a6b7f; --bg:#ffffff; --bg-alt:#f4f7fb;
  --border:#e3e9f1; --maxw:1160px;
}
*{box-sizing:border-box;margin:0;padding:0;}
body{font-family:"Segoe UI",Arial,"Helvetica Neue",sans-serif;color:var(--text);line-height:1.7;font-size:15.5px;background:var(--bg);}
img{max-width:100%;display:block;}
a{color:var(--blue);}
.container{max-width:var(--maxw);margin:0 auto;padding:0 24px;}
section{padding:70px 0;}
.alt{background:var(--bg-alt);}
h1{font-size:40px;line-height:1.2;}
h2{font-size:28px;color:var(--navy);margin-bottom:8px;}
h3{font-size:17px;color:var(--navy);}
.kicker{display:inline-block;color:var(--accent);font-weight:700;letter-spacing:2px;text-transform:uppercase;font-size:12.5px;margin-bottom:10px;}
.sub{color:var(--muted);max-width:760px;margin-bottom:36px;}
.btn{display:inline-block;padding:13px 30px;border-radius:6px;font-weight:700;text-decoration:none;font-size:15px;transition:.2s;border:none;cursor:pointer;}
.btn-primary{background:var(--accent);color:#1a1a1a;}
.btn-primary:hover{background:#e09612;}
.btn-ghost{border:2px solid rgba(255,255,255,.6);color:#fff;margin-left:12px;}
.btn-ghost:hover{border-color:var(--accent);color:var(--accent);}
.btn-navy{background:var(--navy);color:#fff;}
.btn-navy:hover{background:var(--navy2);}
.btn-sm{padding:9px 22px;font-size:14px;}

/* topbar + nav */
.topbar{background:var(--navy);color:#cfe0f5;font-size:13px;padding:8px 0;}
.topbar .container{display:flex;justify-content:space-between;align-items:center;flex-wrap:wrap;gap:6px;}
.topbar a{color:#fff;text-decoration:none;}
nav{background:#fff;border-bottom:1px solid var(--border);position:sticky;top:0;z-index:50;box-shadow:0 1px 8px rgba(11,37,69,.06);}
nav .container{display:flex;align-items:center;justify-content:space-between;height:66px;}
.logo{font-size:22px;font-weight:800;color:var(--navy);text-decoration:none;}
.logo span{color:var(--accent);}
.logo.inv{color:#fff;}
.logo-img{height:42px;width:auto;display:block;}
.logo-chip{display:inline-block;background:#fff;border-radius:8px;padding:6px 12px;}
.logo-chip .logo-img{height:34px;}
nav ul{display:flex;list-style:none;gap:28px;}
nav ul a{text-decoration:none;color:var(--text);font-weight:600;font-size:14.5px;}
nav ul a:hover,nav ul a.active{color:var(--blue);}
nav ul a.accent{color:var(--accent);}
nav ul a.active.accent{color:#e09612;}
.nav-toggle{display:none;background:none;border:none;font-size:22px;cursor:pointer;}
@media(max-width:900px){
  nav ul{display:none;position:absolute;top:66px;left:0;right:0;background:#fff;flex-direction:column;padding:18px 24px;box-shadow:0 10px 20px rgba(0,0,0,.1);}
  nav ul.open{display:flex;}
  .nav-toggle{display:block;}
}

/* hero */
.hero{background:radial-gradient(1100px 520px at 76% 42%,rgba(46,94,158,.5),rgba(46,94,158,0) 70%),linear-gradient(rgba(9,26,48,.95),rgba(9,26,48,.95)),var(--navy);color:#fff;padding:84px 0;text-align:left;overflow:hidden;}
.hero-grid{display:grid;grid-template-columns:1.05fr .95fr;gap:44px;align-items:center;}
.hero-copy h1{color:#fff;}
.hero-copy p{color:#c9d8ec;max-width:560px;margin:18px 0 30px;font-size:17px;}
.hero-cta{display:flex;flex-wrap:wrap;gap:14px;align-items:center;}
.hero-cta .btn-ghost{margin-left:0;}
.hero-copy .hero-note{margin:26px 0 0;font-size:13.5px;color:#9fb4d0;max-width:none;}
.hero-visual img{width:100%;height:auto;}

/* trust strip */
.trust{background:var(--navy2);color:#fff;padding:26px 0;}
.trust .container{display:grid;grid-template-columns:repeat(4,1fr);gap:20px;text-align:center;}
.trust b{font-size:26px;display:block;color:var(--accent);}
.trust span{font-size:13.5px;color:#c9d8ec;}
@media(max-width:760px){.trust .container{grid-template-columns:repeat(2,1fr);}}

/* cards & grids */
.grid3{display:grid;grid-template-columns:repeat(3,1fr);gap:22px;}
.grid4{display:grid;grid-template-columns:repeat(4,1fr);gap:20px;}
@media(max-width:900px){.grid3,.grid4{grid-template-columns:1fr 1fr;}}
@media(max-width:600px){.grid3,.grid4{grid-template-columns:1fr;}}
.card{background:#fff;border:1px solid var(--border);border-radius:10px;overflow:hidden;transition:.2s;display:block;text-decoration:none;color:inherit;}
.card:visited{text-decoration:none;color:inherit;}
.card a{text-decoration:none;}
.card:hover{transform:translateY(-4px);box-shadow:0 10px 26px rgba(11,37,69,.12);}
.card .thumb{height:190px;background:#eef3fa;overflow:hidden;display:flex;align-items:center;justify-content:center;}
.card .thumb img{width:100%;height:100%;object-fit:cover;}
.card .body{padding:18px 20px 22px;}
.card .body p{color:var(--muted);font-size:14px;margin:6px 0 14px;}
.model-chip{display:inline-block;background:var(--navy);color:#fff;font-size:11.5px;font-weight:700;padding:2px 10px;border-radius:10px;letter-spacing:.5px;}
.cat-chip{display:inline-block;background:var(--bg-alt);color:var(--muted);font-size:11.5px;padding:2px 10px;border-radius:10px;margin-left:6px;}

/* split */
.split{display:grid;grid-template-columns:1.1fr 1fr;gap:50px;align-items:center;}
@media(max-width:860px){.split{grid-template-columns:1fr;}}
.checks{list-style:none;margin:18px 0 26px;}
.checks li{padding-left:30px;position:relative;margin:10px 0;}
.checks li::before{content:"\2714";position:absolute;left:0;color:var(--accent);font-weight:800;}
.media{background:linear-gradient(135deg,#dce7f5,#b9cfe8);border-radius:12px;min-height:340px;display:flex;align-items:center;justify-content:center;color:#5a7396;font-size:14px;overflow:hidden;}
.media-fixed{height:430px;background:#f4f8fc;}
.media-fixed img{width:100%;height:100%;object-fit:cover;}

/* steps */
.steps{display:grid;grid-template-columns:repeat(6,1fr);gap:12px;text-align:center;}
@media(max-width:900px){.steps{grid-template-columns:repeat(3,1fr);}}
@media(max-width:600px){.steps{grid-template-columns:repeat(2,1fr);}}
.step{background:#fff;border:1px solid var(--border);border-radius:10px;padding:18px 10px;}
.step b{display:block;color:var(--accent);font-size:22px;}
.step span{font-size:13.5px;font-weight:600;color:var(--navy);}

/* certs */
.certs{display:flex;gap:14px;flex-wrap:wrap;margin-top:24px;}
.cert{border:1.5px solid var(--border);border-radius:8px;padding:10px 20px;font-weight:700;color:var(--navy);font-size:14px;background:#fff;}

/* FAQ */
details{background:#fff;border:1px solid var(--border);border-radius:8px;padding:16px 20px;margin-bottom:12px;}
summary{font-weight:700;color:var(--navy);cursor:pointer;font-size:15.5px;}
details p{margin-top:10px;color:var(--muted);font-size:14.5px;}

/* cta band */
.cta-band{background:linear-gradient(135deg,var(--navy),var(--blue));color:#fff;text-align:center;padding:64px 0;}
.cta-band h2{color:#fff;}
.cta-band p{color:#c9d8ec;margin:12px 0 28px;}

/* RFQ form */
.rfq{display:grid;grid-template-columns:1fr 1.2fr;gap:50px;align-items:start;}
@media(max-width:860px){.rfq{grid-template-columns:1fr;}}
form{background:#fff;border:1px solid var(--border);border-radius:12px;padding:28px;}
.row2{display:grid;grid-template-columns:1fr 1fr;gap:14px;}
label{font-size:13px;font-weight:700;color:var(--navy);display:block;margin:12px 0 5px;}
input,select,textarea{width:100%;padding:11px 12px;border:1px solid var(--border);border-radius:6px;font-size:14px;font-family:inherit;background:var(--bg-alt);}
textarea{min-height:100px;resize:vertical;}
button.btn{width:100%;margin-top:18px;}
.contact-list{list-style:none;}
.contact-list li{margin:14px 0;padding-left:32px;position:relative;}
.contact-list li::before{content:"\2709";position:absolute;left:0;color:var(--blue);}
.hp-field{position:absolute;left:-9999px;opacity:0;} /* honeypot */
.alert-ok{background:#e8f6ee;border:1px solid #bfe4cf;color:#1a7f4b;border-radius:8px;padding:14px 18px;margin:16px 0;}
.alert-err{background:#fdecea;border:1px solid #f5c6c0;color:#c0392b;border-radius:8px;padding:14px 18px;margin:16px 0;}

/* product listing */
.cat-tabs{display:flex;gap:10px;flex-wrap:wrap;margin-bottom:34px;}
.cat-tabs a{text-decoration:none;padding:8px 18px;border-radius:20px;font-size:14px;font-weight:600;color:var(--muted);border:1.5px solid var(--border);background:#fff;}
.cat-tabs a.on,.cat-tabs a:hover{background:var(--navy);color:#fff;border-color:var(--navy);}
.price-tag{font-size:15px;font-weight:800;color:var(--navy);}

/* product detail */
.pd-wrap{display:grid;grid-template-columns:1fr 1fr;gap:44px;align-items:start;}
@media(max-width:860px){.pd-wrap{grid-template-columns:1fr;}}
.pd-main-img{border:1px solid var(--border);border-radius:12px;overflow:hidden;background:#eef3fa;}
.pd-main-img img{width:100%;aspect-ratio:1/1;object-fit:contain;background:#fff;}
.pd-noimg{aspect-ratio:1/1;display:flex;align-items:center;justify-content:center;color:#8ba1bd;font-size:14px;font-weight:600;letter-spacing:.4px;text-align:center;padding:20px;}
.pd-thumbs{display:grid;grid-template-columns:repeat(5,1fr);gap:10px;margin-top:12px;}
.pd-thumbs img{border:2px solid var(--border);border-radius:8px;cursor:pointer;aspect-ratio:1/1;object-fit:cover;width:100%;}
.pd-thumbs img.on{border-color:var(--accent);}
.pd-meta{margin:14px 0;}
.pd-price{font-size:26px;font-weight:800;color:var(--navy);}
.pd-price small{text-decoration:line-through;color:var(--muted);font-weight:400;font-size:15px;margin-left:10px;}
.pd-params{width:100%;border-collapse:collapse;margin:20px 0;background:#fff;}
.pd-params th,.pd-params td{border:1px solid var(--border);padding:9px 14px;font-size:14px;text-align:left;}
.pd-params th{background:var(--bg-alt);width:34%;}
.pd-detail{background:#fff;border:1px solid var(--border);border-radius:12px;padding:34px;margin-top:50px;}
.pd-detail h2,.pd-detail h3{margin:22px 0 10px;}
.pd-detail ul,.pd-detail ol{padding-left:26px;}
.pd-detail li{margin:6px 0;}
.pd-detail img{margin:18px auto;}
.breadcrumb{font-size:13px;color:var(--muted);margin:22px 0 8px;}
.breadcrumb a{color:var(--muted);}

/* footer */
footer{background:var(--navy);color:#aebfd6;padding:56px 0 24px;font-size:14px;margin-top:60px;}
footer .container{display:grid;grid-template-columns:2fr 1fr 1fr 1.4fr;gap:36px;}
@media(max-width:800px){footer .container{grid-template-columns:1fr 1fr;}}
footer h4{color:#fff;font-size:15px;margin-bottom:14px;}
footer ul{list-style:none;}
footer li{margin:7px 0;}
footer a{color:#aebfd6;text-decoration:none;}
footer a:hover{color:var(--accent);}
footer .f-about{margin-top:12px;font-size:13.5px;}
.copyright{border-top:1px solid rgba(255,255,255,.12);margin-top:40px;padding-top:18px;text-align:center;font-size:12.5px;color:#7f93ad;}

/* =====================================================
   Mobile optimization
   ===================================================== */

/* --- nav bar on small screens: logo left, hamburger right --- */
@media(max-width:860px){
  nav .container{gap:10px;}
  .nav-toggle{margin-left:auto;font-size:26px;color:var(--navy);padding:6px 10px;}
  nav > .container > .btn{display:none;} /* free space; CTA moves into dropdown */
  nav ul{top:100%;padding:10px 24px 16px;max-height:70vh;overflow-y:auto;}
  nav ul li{border-bottom:1px solid var(--border);}
  nav ul li:last-child{border-bottom:none;}
  nav ul a{display:block;padding:13px 4px;font-size:15.5px;}
  nav ul a.accent{margin-top:2px;}
  /* put a full-width Request a Quote inside the dropdown */
  nav ul li.nav-cta{display:block;}
  nav ul li.nav-cta a{background:var(--accent);color:#1a1a1a !important;text-align:center;border-radius:6px;font-weight:700;margin:12px 0 4px;}
}
nav ul li.nav-cta{display:none;}

/* --- topbar: hide tagline on narrow screens --- */
@media(max-width:700px){
  .topbar{font-size:12px;}
  .topbar .tagline{display:none;}
  .topbar .container{justify-content:center;}
}

/* --- global mobile layout (<=600px) --- */
@media(max-width:600px){
  section{padding:44px 0;}
  .container{padding:0 16px;}
  h1{font-size:27px;}
  h2{font-size:22px;}
  .kicker{font-size:11px;letter-spacing:1.5px;}
  .sub{margin-bottom:24px;font-size:14.5px;}

  /* hero */
  .hero{padding:52px 0;}
  .hero-grid{grid-template-columns:1fr;gap:26px;}
  .hero-copy p{font-size:15px;margin:14px 0 22px;padding:0;}
  .hero-copy .hero-note{font-size:13px;margin-top:20px;}
  .btn{padding:12px 22px;font-size:14.5px;width:auto;}
  .btn-ghost{margin-left:0;margin-top:0;}

  /* product detail */
  .pd-wrap{gap:26px;}
  .pd-thumbs{grid-template-columns:repeat(4,1fr);gap:8px;}
  .pd-price{font-size:22px;}
  .pd-detail{padding:18px 16px;margin-top:30px;}
  .pd-detail img{margin:12px auto;}
  .pd-params{margin:14px 0;}
  .pd-params th,.pd-params td{padding:7px 9px;font-size:13px;word-break:break-word;}
  .pd-params th{width:42%;}
  .breadcrumb{margin:16px 0 6px;}

  /* forms: single column, no iOS zoom */
  form{padding:18px 14px;}
  .row2{grid-template-columns:1fr;gap:0;}
  input,select,textarea{font-size:16px;padding:10px 11px;}

  /* footer stacks */
  footer{padding:40px 0 18px;margin-top:40px;}
  footer .container{grid-template-columns:1fr;gap:22px;}
  .copyright{margin-top:26px;}

  /* misc */
  .media{min-height:220px;}
  .media-fixed{height:240px;}
  .step{padding:13px 8px;}
  .step b{font-size:19px;}
  .step span{font-size:12px;line-height:1.45;}
  .trust b{font-size:21px;}
  details{padding:13px 14px;}
  summary{font-size:15px;}
  .cert{padding:8px 14px;font-size:13px;}
}

/* tables never overflow the viewport */
.pd-params{display:block;overflow-x:auto;-webkit-overflow-scrolling:touch;}
@media(min-width:601px){.pd-params{display:table;}}

/* GEO: company snapshot facts */
.facts{display:grid;grid-template-columns:repeat(4,1fr);gap:14px;margin-top:8px;}
.fact{background:#fff;border:1px solid var(--border);border-radius:10px;padding:16px 18px;}
.fact b{display:block;color:var(--navy);font-size:14px;margin-bottom:6px;}
.fact span{font-size:13.5px;color:#44586f;line-height:1.55;display:block;}
@media(max-width:960px){.facts{grid-template-columns:repeat(2,1fr);}}
@media(max-width:600px){.facts{grid-template-columns:1fr;}}

/* GEO: article "In this guide" outline */
.geo-toc{background:var(--bg-alt);border:1px solid var(--border);border-radius:10px;padding:16px 20px;margin:18px 0;}
.geo-toc b{color:var(--navy);font-size:13.5px;text-transform:uppercase;letter-spacing:.8px;}
.geo-toc ul{margin:8px 0 0;padding-left:20px;color:#44586f;font-size:14px;}
.geo-toc li{margin:3px 0;}

/* =====================================================
   Social icons
   ===================================================== */
.social{display:flex;gap:10px;margin-top:18px;flex-wrap:wrap;}
.social a{display:inline-flex;align-items:center;justify-content:center;width:38px;height:38px;border-radius:9px;background:rgba(255,255,255,.08);color:#cfe0f5;transition:.2s;border:1px solid rgba(255,255,255,.12);}
.social a:hover{background:var(--accent);color:#1a1a1a;border-color:var(--accent);transform:translateY(-2px);}
.topbar .soc-mini{display:inline-flex;gap:8px;margin-left:10px;vertical-align:middle;}
.topbar .soc-mini a{color:#9db8d8;display:inline-flex;transition:.2s;}
.topbar .soc-mini a:hover{color:var(--accent);}
@media(max-width:700px){.topbar .soc-mini{display:none;}}

/* =====================================================
   Resources (articles) listing & detail
   ===================================================== */
.res-card .thumb{height:170px;background:linear-gradient(135deg,#dce7f5,#b9cfe8);overflow:hidden;display:flex;align-items:center;justify-content:center;}
.res-card .thumb img{width:100%;height:100%;object-fit:cover;}
.res-card .meta{font-size:12px;color:var(--muted);margin-bottom:6px;}
.res-card h3{font-size:15.5px;line-height:1.45;}
.res-card p{color:var(--muted);font-size:13.5px;margin:8px 0 12px;}
.res-article{max-width:820px;margin:0 auto;}
.res-article .res-hero{width:100%;max-height:360px;object-fit:cover;border-radius:12px;margin:18px 0;}
.res-article h1{font-size:30px;}
.res-article .rdetail{margin-top:26px;}
.res-article .rdetail h3{margin:22px 0 10px;font-size:18px;}
.res-article .rdetail p{margin:10px 0;color:#334155;}
.res-article .rdetail ul,.res-article .rdetail ol{padding-left:26px;margin:10px 0;}
.res-article .rdetail li{margin:6px 0;}
@media(max-width:600px){.res-article h1{font-size:23px;}}