:root{
  --max-width:1100px;
  --accent:#0f172a;
  --muted:#666;
  --gap:24px;
  font-family: Inter, system-ui, Arial, sans-serif;
}

*{box-sizing:border-box}
body{margin:0;color:#111;line-height:1.45}

.site-header{position:relative}

/* NAV */
.nav{
  display:flex;
  justify-content:space-between;
  align-items:center;
  padding:18px calc(12px + 2vw);
  position:fixed;
  width:100%;
  top:0;
  left:0;
  z-index:20;
  background:rgba(255,255,255,0.65);
  backdrop-filter:blur(6px);
}
.logo{font-weight:700;text-decoration:none;color:var(--accent)}
.nav-links{list-style:none;margin:0;padding:0;display:flex;gap:18px}
.nav-links a{text-decoration:none;color:var(--accent)}

/* HERO */
.hero{
  height:78vh;
  min-height:420px;
  display:flex;
  align-items:center;
  justify-content:center;
  background-image:linear-gradient(rgba(10,10,10,0.35),rgba(10,10,10,0.35)), url("../assets/hero.jpg");
  background-size:cover;
  background-position:center;
  padding-top:72px; /* espacio por nav fijo */
}
.hero-inner{
  text-align:center;
  color:#fff;
  max-width:900px;
  padding:48px;
}
.hero h1{font-size:clamp(28px,5vw,56px);margin:0 0 12px}
.hero p{margin:0 0 18px;color:rgba(255,255,255,0.9)}
.btn{
  display:inline-block;
  padding:12px 20px;
  border-radius:8px;
  text-decoration:none;
  background:#fff;
  color:var(--accent);
  font-weight:600;
}

/* CONTENT */
main{max-width:var(--max-width);margin:48px auto;padding:0 20px}

.grid-section h2,
.content-section h2,
.contact-section h2{margin:0 0 18px;font-size:1.4rem}

.grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(220px,1fr));gap:var(--gap)}
.card{background:#fff;border-radius:12px;padding:20px;box-shadow:0 6px 20px rgba(12,20,30,0.06)}

/* CONTACT */
.contact-form{display:grid;gap:12px;max-width:560px}
.contact-form input,
.contact-form textarea{padding:10px;border:1px solid #ddd;border-radius:8px;font-size:1rem}
.contact-form button{padding:12px;border-radius:8px;border:0;background:var(--accent);color:#fff;cursor:pointer}

/* FOOTER */
.site-footer{padding:28px 20px;text-align:center;color:var(--muted);font-size:0.9rem}

/* RESPONSIVE tweaks */
@media (max-width:720px){
  .nav{padding:12px}
  .nav-links{display:none}
  .hero{height:64vh}
}