:root {
  --primary: #0f172a;
  --accent: #22c55e;
  --light: #f8fafc;
  --text: #334155;
}

* { margin: 0; padding: 0; box-sizing: border-box; }
body { font-family: system-ui, sans-serif; line-height: 1.6; color: var(--text); background: var(--light); }
.container { max-width: 1100px; margin: 0 auto; padding: 0 20px; }
a { text-decoration: none; color: inherit; }

/* Header */
.header { background: var(--primary); color: white; padding: 1rem 0; position: sticky; top: 0; z-index: 100; }
.header .container { display: flex; justify-content: space-between; align-items: center; }
.logo { font-weight: bold; font-size: 1.4rem; }
.nav { display: flex; gap: 1.5rem; align-items: center; }
.nav a:hover { color: var(--accent); }

/* Botones */
.btn-primary {
  background: var(--accent);
  color: white;
  padding: 0.75rem 1.5rem;
  border-radius: 6px;
  font-weight: 600;
  border: none;
  cursor: pointer;
  transition: background 0.3s;
}
.btn-primary:hover { background: #16a34a; }

/* Hero */
.hero { 
  background: linear-gradient(135deg, var(--primary), #1e293b); 
  color: white; 
  padding: 5rem 0; 
  text-align: center; 
}
.hero h1 { font-size: 2.2rem; margin-bottom: 1rem; }
.hero p { font-size: 1.2rem; margin-bottom: 2rem; opacity: 0.9; }

/* Servicios */
.services, .about, .contact { padding: 4rem 0; }
.services h2, .about h2, .contact h2 { text-align: center; margin-bottom: 2rem; color: var(--primary); }
.cards { display: grid; grid-template-columns: repeat(auto-fit, minmax(250px, 1fr)); gap: 1.5rem; }
.card { 
  background: white; 
  padding: 1.5rem; 
  border-radius: 8px; 
  box-shadow: 0 2px 10px rgba(0,0,0,0.05); 
  border-top: 4px solid var(--accent);
}
.card h3 { margin-bottom: 0.5rem; color: var(--primary); }

/* Contacto */
.contact-form { 
  max-width: 600px; 
  margin: 0 auto; 
  display: flex; 
  flex-direction: column; 
  gap: 1rem; 
}
.contact-form input, 
.contact-form textarea {
  padding: 0.8rem;
  border: 1px solid #cbd5e1;
  border-radius: 6px;
  font-size: 1rem;
}
.contact-form textarea { min-height: 120px; }
.small { text-align: center; margin-top: 1rem; font-size: 0.9rem; }

/* Footer */
.footer { background: var(--primary); color: white; text-align: center; padding: 2rem 0; margin-top: 2rem; }
.footer small { opacity: 0.8; }

/* Responsive */
@media (max-width: 768px) {
  .header .container { flex-direction: column; gap: 1rem; }
  .nav { flex-wrap: wrap; justify-content: center; }
  .hero h1 { font-size: 1.8rem; }
}
/* Contacto */
.contact { 
  padding: 4rem 0; 
  text-align: center; 
  background: white;
}
.contact h2 { 
  color: var(--primary); 
  margin-bottom: 1rem; 
}
.contact-intro {
  font-size: 1.1rem;
  margin-bottom: 2rem;
  color: var(--text);
  max-width: 600px;
  margin-left: auto;
  margin-right: auto;
}
.btn-large {
  display: inline-block;
  font-size: 1.1rem;
  padding: 1rem 2rem;
  margin-bottom: 1rem;
}
.small {
  font-size: 0.9rem;
  opacity: 0.8;
  margin-top: 0.5rem;
}

/* WhatsApp opcional */
.whatsapp-option {
  margin-top: 2rem;
  padding-top: 1.5rem;
  border-top: 1px dashed #cbd5e1;
}
.btn-whatsapp {
  display: inline-block;
  background: #25D366;
  color: white;
  padding: 0.75rem 1.5rem;
  border-radius: 6px;
  font-weight: 600;
  margin-top: 0.5rem;
  transition: background 0.3s;
}
.btn-whatsapp:hover { background: #128C7E; }