body {
  font-family: Arial, sans-serif;
  margin: 0;
  background: #f5f7fa;
  color: #222;
}

header {
  background: #0b1f3a;
  padding: 15px;
  color: white;
  display: flex;
  justify-content: space-between;
}

nav a {
  color: white;
  margin: 0 10px;
  text-decoration: none;
}

.hero {
  padding: 100px 20px;
  text-align: center;
  color: white;
  background: url('https://images.unsplash.com/photo-1507525428034-b723cf961d3e') no-repeat center center/cover;
  position: relative;
}

.hero::after {
  content: "";
  position: absolute;
  top:0;
  left:0;
  width:100%;
  height:100%;
  background: rgba(0,0,0,0.5);
}

.hero h1, .hero p, .hero button {
  position: relative;
  z-index: 1;
}


.section {
  padding: 40px 20px;
  text-align: center;
}

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

.card {
  background: white;
  padding: 20px;
  border-radius: 10px;
}

button {
  padding: 10px 15px;
  background: #1e90ff;
  color: white;
  border: none;
  border-radius: 5px;
}

footer {
  background: #0b1f3a;
  color: white;
  text-align: center;
  padding: 20px;
}

.whatsapp-float {
  position: fixed;
  bottom: 20px;
  right: 20px;
  background: #25D366;
  color: white;
  font-size: 24px;
  padding: 15px;
  border-radius: 50%;
  text-align: center;
  text-decoration: none;
  box-shadow: 0 4px 10px rgba(0,0,0,0.3);
  z-index: 1000;  
}

nav {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 10px;
}

nav a, nav b {
  text-decoration: none;
  padding: 8px 12px;
  font-size: 14px;
}

nav b {
  font-weight: 600;
}

/* ✅ Mobile optimization */
@media (max-width: 600px) {
  nav {
    flex-direction: column;
    align-items: center;
  }

  nav a, nav b {
    width: 100%;
    text-align: center;
    padding: 12px;
    border-bottom: 1px solid #eee;
  }
}

nav .active { 
  color: #EFBF04;
}