/* ============================================
   S3 Systems — Main Stylesheet
   ============================================ */

/* --- Reset & Base --- */
*,*::before,*::after{margin:0;padding:0;box-sizing:border-box}
:root{
  --primary:#0a0e17;
  --primary-light:#0f1524;
  --accent:#00b4ff;
  --accent-dim:rgba(0,180,255,0.15);
  --accent-glow:rgba(0,180,255,0.3);
  --text:#e0e6f0;
  --text-muted:rgba(224,230,240,0.55);
  --text-dim:rgba(224,230,240,0.3);
  --border:rgba(0,180,255,0.1);
  --surface:rgba(15,21,36,0.8);
  --max-w:1200px;
  --nav-h:72px;
}
html{scroll-behavior:smooth;font-size:16px}
body{
  font-family:'Segoe UI',system-ui,-apple-system,sans-serif;
  background:var(--primary);
  color:var(--text);
  line-height:1.7;
  -webkit-font-smoothing:antialiased;
}
a{color:var(--accent);text-decoration:none;transition:opacity 0.2s}
a:hover{opacity:0.8}
img{max-width:100%;display:block}
.container{max-width:var(--max-w);margin:0 auto;padding:0 2rem}

/* --- Navigation --- */
.nav{
  position:fixed;top:0;left:0;width:100%;height:var(--nav-h);
  z-index:100;
  background:rgba(10,14,23,0.92);
  backdrop-filter:blur(20px);
  border-bottom:1px solid var(--border);
  transition:background 0.3s;
}
.nav .container{
  display:flex;align-items:center;justify-content:space-between;height:100%;
}
.nav-brand{
  display:flex;align-items:center;gap:0.75rem;
  font-size:1.25rem;font-weight:700;letter-spacing:0.08em;
  color:var(--text);text-transform:uppercase;
}
.nav-brand svg{width:36px;height:36px}
.nav-links{display:flex;gap:2rem;list-style:none}
.nav-links a{
  font-size:0.8rem;letter-spacing:0.15em;text-transform:uppercase;
  color:var(--text-muted);transition:color 0.2s;
  position:relative;padding:0.25rem 0;
}
.nav-links a::after{
  content:'';position:absolute;bottom:0;left:0;width:0;height:1px;
  background:var(--accent);transition:width 0.3s;
}
.nav-links a:hover,
.nav-links a.active{color:var(--text);opacity:1}
.nav-links a:hover::after,
.nav-links a.active::after{width:100%}
.nav-cta{
  font-size:0.75rem;letter-spacing:0.12em;text-transform:uppercase;
  padding:0.6rem 1.5rem;
  border:1px solid var(--accent-glow);
  color:var(--accent);
  background:transparent;
  cursor:pointer;
  transition:all 0.3s;
}
.nav-cta:hover{
  background:var(--accent-dim);
  box-shadow:0 0 20px rgba(0,180,255,0.1);
}

/* Mobile nav */
.nav-menu{display:flex;align-items:center;gap:2rem}
.nav-toggle{display:none;background:none;border:none;color:var(--text);font-size:1.5rem;cursor:pointer}
@media(max-width:768px){
  .nav-toggle{display:block}
  .nav-menu{
    position:fixed;top:var(--nav-h);left:0;width:100%;
    background:rgba(10,14,23,0.98);
    backdrop-filter:blur(20px);
    flex-direction:column;align-items:center;
    padding:2rem 0;gap:1.5rem;
    border-bottom:1px solid var(--border);
    display:none;
  }
  .nav-menu.open{display:flex}
  .nav-links{flex-direction:column;align-items:center;gap:1.5rem}
}

/* --- Hero --- */
.hero{
  position:relative;min-height:100vh;
  display:flex;align-items:center;
  padding-top:var(--nav-h);
  overflow:hidden;
}
.hero-bg{
  position:absolute;top:0;left:0;width:100%;height:100%;z-index:0;
}
.hero-bg canvas{width:100%;height:100%}
.hero-overlay{
  position:absolute;top:0;left:0;width:100%;height:100%;z-index:1;
  background:linear-gradient(180deg,rgba(10,14,23,0.3) 0%,rgba(10,14,23,0.8) 80%,var(--primary) 100%);
}
.hero-content{position:relative;z-index:2;max-width:700px}
.hero-badge{
  display:inline-block;
  font-size:0.65rem;letter-spacing:0.3em;text-transform:uppercase;
  color:var(--accent);
  border:1px solid var(--accent-dim);
  padding:0.4rem 1rem;margin-bottom:1.5rem;
}
.hero h1{
  font-size:clamp(2.2rem,5vw,3.8rem);
  font-weight:700;line-height:1.15;
  margin-bottom:1.25rem;
}
.hero h1 span{
  background:linear-gradient(135deg,var(--accent),#0077cc);
  -webkit-background-clip:text;-webkit-text-fill-color:transparent;
  background-clip:text;
}
.hero p{
  font-size:clamp(1rem,2vw,1.15rem);
  color:var(--text-muted);
  max-width:560px;margin:0 auto 2rem;
}
.hero-actions{display:flex;gap:1rem;flex-wrap:wrap}

/* --- Buttons --- */
.btn{
  display:inline-flex;align-items:center;gap:0.5rem;
  font-size:0.8rem;letter-spacing:0.1em;text-transform:uppercase;
  padding:0.85rem 2rem;
  border:none;cursor:pointer;
  transition:all 0.3s;font-family:inherit;
}
.btn-primary{
  background:var(--accent);color:var(--primary);font-weight:600;
  box-shadow:0 0 30px rgba(0,180,255,0.15);
}
.btn-primary:hover{
  background:#33c4ff;
  box-shadow:0 0 40px rgba(0,180,255,0.25);
  opacity:1;
}
.btn-outline{
  background:transparent;color:var(--text);
  border:1px solid var(--border);
}
.btn-outline:hover{
  border-color:var(--accent-glow);
  background:var(--accent-dim);
  opacity:1;
}

/* --- Section Base --- */
.section{padding:6rem 0}
.section-dark{background:var(--primary-light)}
.section-label{
  font-size:0.65rem;letter-spacing:0.35em;text-transform:uppercase;
  color:var(--accent);margin-bottom:0.75rem;
}
.section-title{
  font-size:clamp(1.6rem,3.5vw,2.4rem);
  font-weight:700;margin-bottom:1rem;line-height:1.2;
}
.section-subtitle{
  color:var(--text-muted);
  max-width:600px;margin-bottom:3rem;
  font-size:1.05rem;
}
.section-header{margin-bottom:3.5rem}
.section-header.center{text-align:center}
.section-header.center .section-subtitle{margin-left:auto;margin-right:auto}

/* --- Services Grid --- */
.services-grid{
  display:grid;
  grid-template-columns:repeat(auto-fit,minmax(300px,1fr));
  gap:1.5rem;
}
.service-card{
  background:var(--surface);
  border:1px solid var(--border);
  padding:2.5rem 2rem;
  transition:all 0.3s;
  position:relative;
  overflow:hidden;
}
.service-card::before{
  content:'';position:absolute;top:0;left:0;width:100%;height:2px;
  background:linear-gradient(90deg,transparent,var(--accent),transparent);
  opacity:0;transition:opacity 0.3s;
}
.service-card:hover{
  border-color:var(--accent-glow);
  transform:translateY(-2px);
  box-shadow:0 10px 40px rgba(0,0,0,0.3);
}
.service-card:hover::before{opacity:1}
.service-icon{
  width:48px;height:48px;
  display:flex;align-items:center;justify-content:center;
  border:1px solid var(--accent-dim);
  margin-bottom:1.5rem;
  color:var(--accent);font-size:1.2rem;
}
.service-card h3{
  font-size:1.1rem;margin-bottom:0.75rem;font-weight:600;
}
.service-card p{
  font-size:0.9rem;color:var(--text-muted);line-height:1.7;
}

/* --- Stats Bar --- */
.stats{
  display:grid;
  grid-template-columns:repeat(auto-fit,minmax(200px,1fr));
  gap:2rem;
  padding:4rem 0;
  border-top:1px solid var(--border);
  border-bottom:1px solid var(--border);
}
.stat{text-align:center}
.stat-value{
  font-size:clamp(2rem,4vw,2.8rem);
  font-weight:700;
  color:var(--accent);
  line-height:1;margin-bottom:0.5rem;
}
.stat-label{
  font-size:0.75rem;letter-spacing:0.2em;text-transform:uppercase;
  color:var(--text-muted);
}

/* --- About / Split Section --- */
.split{
  display:grid;
  grid-template-columns:1fr 1fr;
  gap:4rem;
  align-items:start;
}
.split-media{
  position:relative;
  border:1px solid var(--border);
  aspect-ratio:4/3;
  background:var(--surface);
  display:flex;align-items:center;justify-content:center;
  overflow:hidden;
}
.split-media .placeholder{
  font-size:0.75rem;letter-spacing:0.2em;text-transform:uppercase;
  color:var(--text-dim);
}
@media(max-width:768px){
  .split{grid-template-columns:1fr;gap:2rem}
}

/* --- Capabilities / Features List --- */
.features-list{list-style:none;display:flex;flex-direction:column;gap:1rem;margin-top:1.5rem}
.features-list li{
  display:flex;align-items:flex-start;gap:0.75rem;
  font-size:0.95rem;color:var(--text-muted);
}
.features-list li::before{
  content:'';flex-shrink:0;
  width:8px;height:8px;margin-top:0.5rem;
  border:1px solid var(--accent);
  transform:rotate(45deg);
}

/* --- CTA Banner --- */
.cta-banner{
  text-align:center;
  padding:5rem 2rem;
  background:linear-gradient(180deg,var(--primary) 0%,var(--primary-light) 50%,var(--primary) 100%);
  border-top:1px solid var(--border);
  border-bottom:1px solid var(--border);
}
.cta-banner h2{
  font-size:clamp(1.5rem,3vw,2.2rem);
  margin-bottom:1rem;
}
.cta-banner p{
  color:var(--text-muted);
  max-width:500px;margin:0 auto 2rem;
}

/* --- Contact Form --- */
.contact-grid{
  display:grid;
  grid-template-columns:1fr 1.2fr;
  gap:4rem;
}
.contact-info{display:flex;flex-direction:column;gap:2rem}
.contact-item{display:flex;align-items:flex-start;gap:1rem}
.contact-item-icon{
  width:40px;height:40px;flex-shrink:0;
  display:flex;align-items:center;justify-content:center;
  border:1px solid var(--accent-dim);
  color:var(--accent);font-size:0.9rem;
}
.contact-item h4{font-size:0.9rem;margin-bottom:0.25rem}
.contact-item p{font-size:0.85rem;color:var(--text-muted)}

.form{display:flex;flex-direction:column;gap:1.25rem}
.form-row{display:grid;grid-template-columns:1fr 1fr;gap:1.25rem}
.form-group{display:flex;flex-direction:column;gap:0.4rem}
.form-group label{
  font-size:0.7rem;letter-spacing:0.15em;text-transform:uppercase;
  color:var(--text-muted);
}
.form-group input,
.form-group textarea,
.form-group select{
  background:var(--surface);
  border:1px solid var(--border);
  color:var(--text);
  padding:0.8rem 1rem;
  font-family:inherit;font-size:0.9rem;
  transition:border-color 0.2s;
  outline:none;
}
.form-group input:focus,
.form-group textarea:focus,
.form-group select:focus{
  border-color:var(--accent-glow);
}
.form-group textarea{resize:vertical;min-height:120px}
@media(max-width:768px){
  .contact-grid{grid-template-columns:1fr}
  .form-row{grid-template-columns:1fr}
}

/* --- Footer --- */
.footer{
  border-top:1px solid var(--border);
  padding:4rem 0 2rem;
}
.footer-grid{
  display:grid;
  grid-template-columns:2fr 1fr 1fr 1fr;
  gap:3rem;
  margin-bottom:3rem;
}
.footer-brand{font-size:0.9rem;color:var(--text-muted);line-height:1.8}
.footer-brand .nav-brand{margin-bottom:1rem}
.footer-col h4{
  font-size:0.7rem;letter-spacing:0.25em;text-transform:uppercase;
  color:var(--text);margin-bottom:1.25rem;
}
.footer-col ul{list-style:none;display:flex;flex-direction:column;gap:0.6rem}
.footer-col a{font-size:0.85rem;color:var(--text-muted)}
.footer-col a:hover{color:var(--text)}
.footer-bottom{
  display:flex;justify-content:space-between;align-items:center;
  padding-top:2rem;
  border-top:1px solid var(--border);
  font-size:0.75rem;color:var(--text-dim);
}
@media(max-width:768px){
  .footer-grid{grid-template-columns:1fr 1fr;gap:2rem}
}
@media(max-width:480px){
  .footer-grid{grid-template-columns:1fr}
}

/* --- Utilities --- */
.text-accent{color:var(--accent)}
.mt-1{margin-top:0.5rem}
.mt-2{margin-top:1rem}
.mt-3{margin-top:1.5rem}
.mt-4{margin-top:2rem}
.mb-4{margin-bottom:2rem}