:root{
  --brand:#0ea5a4; /* primary brand (teal) */
  --brand-700:#0b8f85;
  --accent:#102a43; /* dark accent */
  --bg:#f6fbfb;
  --muted:#6b7280;
  --card-bg:#ffffff;
  --radius:14px;
  --max-width:1100px;
}

*{box-sizing:border-box}
html,body{height:100%}
body{font-family:Inter, system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial;line-height:1.6;color:#0f1724;background:var(--bg);margin:0}
.container{max-width:var(--max-width)}

/* Header / Nav */
.site-header{background:transparent;padding:0.25rem 0}
.navbar{padding:.75rem 0}
.navbar-brand{font-weight:700;color:var(--accent);font-size:1.25rem}
.navbar .nav-link{color:var(--accent);margin-left:.5rem}
.navbar .nav-link.active{color:var(--brand);font-weight:600}

/* Hero */
.hero{padding:5.5rem 0;background:linear-gradient(180deg, rgba(14,165,164,0.06), rgba(255,255,255,0));}
.hero-title{font-size:2.5rem;margin-bottom:.5rem;color:var(--accent);font-weight:700}
.hero-sub{color:var(--muted);margin-bottom:1.25rem}
.page-hero{padding:3.5rem 0;background:linear-gradient(180deg,#ffffff, #f8fdfd)}

/* Cards / features */
.feature.card{background:var(--card-bg);border:0;border-radius:var(--radius);box-shadow:0 10px 30px rgba(16,42,67,0.06)}
.card.feature .card-body{padding:1.5rem}
.card.feature h5{color:var(--accent);font-weight:600}
.card.feature p{color:var(--muted)}

/* Buttons */
.btn-primary{background:var(--brand);border-color:var(--brand)}
.btn-primary:hover{background:var(--brand-700);border-color:var(--brand-700);filter:brightness(.98)}
.btn-primary:focus{box-shadow:0 0 0 .25rem rgba(14,165,164,0.18)}

/* Footer */
.site-footer{background:transparent;color:var(--muted);}

img{max-width:100%;height:auto;border-radius:8px}

/* Responsive tweaks */
@media (max-width:767px){
  .hero{padding:3rem 1rem}
  .hero-title{font-size:1.5rem}
}

/* Utilities */
.text-center{text-align:center}