body {
  margin: 0;
  font-family: Arial, sans-serif;
  background: #0b1220;
  color: white;
}

/* HEADER */
.header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 20px 40px;
  background: #0f172a;
}

.logo {
  font-size: 22px;
  font-weight: bold;
  color: #22c55e;
}

nav a {
  color: white;
  margin-left: 15px;
  text-decoration: none;
}

/* HERO */
.hero {
  text-align: center;
  padding: 100px 20px;
  background: linear-gradient(135deg, #0f172a, #1e293b);
}

.hero h1 {
  font-size: 40px;
  max-width: 800px;
  margin: auto;
}

.hero p {
  margin-top: 15px;
  color: #cbd5e1;
}

/* BOTÓN */
.btn {
  display: inline-block;
  margin-top: 25px;
  padding: 12px 25px;
  background: #22c55e;
  color: black;
  text-decoration: none;
  border-radius: 8px;
  font-weight: bold;
}

/* SECCIONES */
.section {
  padding: 60px 20px;
  text-align: center;
}

.grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 20px;
  margin-top: 30px;
}

/* TARJETAS */
.card {
  background: #111827;
  padding: 25px;
  border-radius: 12px;
}

/* WHATSAPP FLOAT */
.whatsapp {
  position: fixed;
  bottom: 20px;
  right: 20px;
  background: #25D366;
  color: white;
  width: 60px;
  height: 60px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 28px;
  text-decoration: none;
}