/* Sertronix — landing page styles */
:root{
  --bg:#F4F6F8; --surface:#FFFFFF; --soft:#EAEEF2;
  --ink:#0E141B; --text:#3F4A56; --muted:#5A6572;
  --line:#E3E8ED; --line-2:#D3DAE1;
  --accent:#C2410C; --btn:#1B3A5C; --ok:#15803D;
  --serif:'Space Grotesk','IBM Plex Sans',sans-serif;
  --sans:'IBM Plex Sans',system-ui,-apple-system,sans-serif;
  --mono:'IBM Plex Mono',ui-monospace,monospace;
  --gutter:96px;
}
*,*::before,*::after{box-sizing:border-box}
html{scroll-behavior:smooth;-webkit-text-size-adjust:100%}
body{margin:0;background:var(--bg);color:var(--ink);font-family:var(--sans);font-size:16px;line-height:1.5;-webkit-font-smoothing:antialiased}
a{color:var(--ink);text-decoration:none}
a:hover{color:var(--accent)}
h1,h2,h3{font-family:var(--serif);font-weight:500;margin:0;letter-spacing:-.015em}
p{margin:0}
.wrap{width:100%;max-width:1440px;margin:0 auto;padding-left:var(--gutter);padding-right:var(--gutter)}
:focus-visible{outline:2px solid var(--accent);outline-offset:3px;border-radius:4px}

/* Nav */
.nav{position:sticky;top:0;z-index:10;background:rgba(244,246,248,.9);backdrop-filter:blur(8px);-webkit-backdrop-filter:blur(8px);border-bottom:1px solid var(--line)}
.nav__inner{height:88px;display:flex;align-items:center;gap:40px}
.brand{display:flex;align-items:center;gap:12px;color:var(--ink);margin-right:auto}
.brand:hover{color:var(--ink)}
.brand__text{display:flex;flex-direction:column;gap:4px}
.brand__name{font-family:var(--mono);font-weight:600;font-size:18px;letter-spacing:.18em;line-height:1}
.brand__slogan{font-family:var(--serif);font-size:14px;color:var(--muted);line-height:1}
.nav__links{display:flex;gap:40px;font-size:15px}
.lang{display:flex;border:1px solid var(--line-2);border-radius:999px;padding:3px;font-family:var(--mono);font-size:12px}
.lang a{display:inline-flex;align-items:center;color:var(--muted);border-radius:999px;padding:6px 12px;min-height:32px}
.lang a:hover{color:var(--ink)}
.lang a[aria-current="true"]{background:var(--ink);color:#fff}

/* Shared */
.eyebrow{font-family:var(--mono);font-size:13px;letter-spacing:.12em;color:var(--muted);text-transform:uppercase}
.btn{display:inline-flex;align-items:center;justify-content:center;gap:10px;height:54px;padding:0 28px;border-radius:999px;font-size:16px;font-weight:500;transition:transform .2s ease,opacity .2s ease}
.btn:hover{transform:translateY(-1px);opacity:.92}
.btn--dark{background:var(--btn);color:#fff}.btn--dark:hover{color:#fff}
.btn--accent{background:var(--btn);color:#fff}.btn--accent:hover{color:#fff}
.link-underline{border-bottom:1px solid currentColor;padding-bottom:2px}

/* Hero */
.hero{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:48px;align-items:center;min-height:calc(100vh - 88px);max-height:900px;padding-top:48px;padding-bottom:48px}
.hero__text{display:flex;flex-direction:column;gap:28px}
.hero h1{font-weight:500;font-size:clamp(44px,6vw,84px);line-height:1.02;letter-spacing:-.02em}
.hero__sub{font-size:20px;line-height:1.55;color:var(--text);max-width:480px}
.hero__actions{display:flex;align-items:center;gap:28px;margin-top:8px;flex-wrap:wrap}
.hero__art svg{width:100%;max-width:560px;height:auto;display:block;margin:0 auto}

/* Expertise */
.expertise{background:var(--surface);border-top:1px solid var(--line);border-bottom:1px solid var(--line);padding:96px 0 104px}
.expertise h2,.refs h2{font-size:clamp(38px,4.2vw,56px);margin-top:14px}
.cards{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:24px;margin-top:56px}
.card{display:flex;flex-direction:column;gap:20px;padding:32px;border:1px solid var(--line);border-radius:18px;background:var(--bg);transition:border-color .25s ease,transform .25s ease}
.card:hover{border-color:var(--line-2);transform:translateY(-3px)}
.card__icon{width:132px;height:100px}
.card h3{font-weight:500;font-size:26px;line-height:1.2;letter-spacing:0}
.card p{font-size:16px;line-height:1.55;color:var(--text)}
.tagline{margin-top:56px;text-align:center;font-family:var(--serif);font-size:24px;color:var(--text)}

/* References */
.refs{padding:104px 0 112px}
.refs__sub{font-size:18px;color:var(--text);margin-top:14px}
.marquee{overflow:hidden;border-top:1px solid var(--line);border-bottom:1px solid var(--line);padding:28px 0;margin-top:48px;-webkit-mask-image:linear-gradient(90deg,transparent,#000 8%,#000 92%,transparent);mask-image:linear-gradient(90deg,transparent,#000 8%,#000 92%,transparent)}
.marquee__track{display:flex;gap:24px;width:max-content;animation:marquee 32s linear infinite}
.marquee:hover .marquee__track{animation-play-state:paused}
.logo{width:220px;height:72px;border:1px dashed #BCC5CF;border-radius:12px;display:flex;align-items:center;justify-content:center;font-family:var(--mono);font-size:14px;color:var(--muted);flex-shrink:0}
.logo img{max-width:70%;max-height:60%;filter:grayscale(1);opacity:.7;transition:filter .3s,opacity .3s}
.logo:hover img{filter:none;opacity:1}

/* Contact */
.contact-wrap{padding:0 48px;max-width:1440px;margin:0 auto}
.contact{position:relative;overflow:hidden;padding:112px 48px;border-radius:28px;background:var(--soft);border:1px solid #DCE2E8;display:flex;flex-direction:column;align-items:center;gap:24px;text-align:center}
.contact > *:not(.contact__lines){position:relative}
.contact__lines{position:absolute;inset:0;width:100%;height:100%}
.contact h2{font-size:clamp(36px,4.6vw,64px)}
.contact__sub{font-size:19px;color:var(--text)}
.contact .btn{margin-top:12px;height:56px;padding:0 32px;font-size:17px}
.contact__details{margin-top:20px;display:flex;flex-wrap:wrap;justify-content:center;gap:12px 24px;font-family:var(--mono);font-size:14px;color:var(--text)}
.contact__details a{color:var(--text)}
.contact__details a:hover{color:var(--accent)}

/* Footer */
.footer{display:flex;align-items:center;justify-content:space-between;gap:16px;padding-top:40px;padding-bottom:40px;font-size:14px;color:var(--muted)}
.footer__brand{font-family:var(--mono);font-weight:600;letter-spacing:.18em;color:var(--ink)}
.footer strong{color:var(--ink)}

/* Animations */
@keyframes blink{0%,100%{opacity:1}50%{opacity:.2}}
@keyframes flow{to{stroke-dashoffset:-64}}
@keyframes badge{0%,12%{transform:translateX(0)}40%,70%{transform:translateX(30px)}96%,100%{transform:translateX(0)}}
@keyframes grant{0%,38%{fill:#BCC5CF}42%,70%{fill:#15803D}74%,100%{fill:#BCC5CF}}
@keyframes door{0%,20%{transform:scaleX(1)}45%,75%{transform:scaleX(.15)}100%{transform:scaleX(1)}}
@keyframes marquee{from{transform:translateX(0)}to{transform:translateX(-50%)}}
@keyframes rise{from{opacity:0;transform:translateY(12px)}to{opacity:1;transform:none}}
.led{animation:blink 2.4s ease-in-out infinite}
.l2{animation-delay:.4s}.l3{animation-delay:.9s}.l4{animation-delay:1.3s}.l5{animation-delay:1.8s}
.flow{stroke-dasharray:6 10;animation:flow 2.2s linear infinite}
.flow-slow{stroke-dasharray:4 12;animation:flow 4s linear infinite}
.badge{animation:badge 4s ease-in-out infinite}
.grant{animation:grant 4s ease-in-out infinite}
.door{transform-box:fill-box;transform-origin:left center;animation:door 5s ease-in-out infinite}
.rise{animation:rise .9s ease-out both}.d1{animation-delay:.15s}.d2{animation-delay:.3s}
@media (prefers-reduced-motion:reduce){*,*::before,*::after{animation:none!important;transition:none!important}html{scroll-behavior:auto}}

/* Responsive */
@media (max-width:1200px){
  :root{--gutter:48px}
  .cards{grid-template-columns:repeat(2,minmax(0,1fr))}
  .contact-wrap{padding:0 24px}
}
@media (max-width:900px){
  .hero{grid-template-columns:1fr;min-height:0;max-height:none;padding-top:56px}
  .hero__art svg{max-width:420px}
  .nav__links{display:none}
}
@media (max-width:640px){
  :root{--gutter:20px}
  .nav__inner{height:76px}
  .brand__name{font-size:16px;letter-spacing:.16em}
  .brand__slogan{font-size:13px}
  .hero{gap:32px;padding-top:44px;padding-bottom:32px}
  .hero__text{gap:20px}
  .hero__sub{font-size:17px}
  .hero__actions .btn{width:100%}
  .hero__actions .link-underline{display:none}
  .expertise{padding:56px 0}
  .cards{grid-template-columns:1fr;gap:14px;margin-top:28px}
  .card{padding:24px;gap:14px;border-radius:16px}
  .card__icon{width:106px;height:80px}
  .card h3{font-size:23px}
  .card p{font-size:15px}
  .tagline{margin-top:28px;text-align:left;font-size:19px;line-height:1.45}
  .refs{padding:56px 0}
  .refs__sub{font-size:16px}
  .marquee{margin-top:28px;padding:20px 0}
  .marquee__track{gap:16px}
  .logo{width:150px;height:60px;font-size:13px}
  .contact-wrap{padding:0 16px}
  .contact{padding:56px 24px;border-radius:22px;gap:18px}
  .contact__sub{font-size:16px}
  .contact .btn{align-self:stretch;height:52px}
  .contact__details{flex-direction:column;align-items:center;gap:10px;font-size:13px}
  .contact__details .sep{display:none}
  .contact__details a{padding:6px 0}
  .footer{flex-direction:column;justify-content:center;text-align:center;font-size:13px}
}