body{
font-family:Arial, Helvetica, sans-serif;
margin:0;
color:#333;
}

header{
background:white;
border-bottom:1px solid #ddd;
}

.nav{
display:flex;
justify-content:space-between;
align-items:center;
padding:15px 40px;
}

.logo{
height:55px;
}

nav a{
margin-left:20px;
text-decoration:none;
font-weight:bold;
color:#333;
}

.hero{
background:url('images/hero.jpg') center/cover;
height:540px;
display:flex;
align-items:center;
justify-content:center;
text-align:center;
color:white;
}

.hero h1{
font-size:52px;
margin-bottom:10px;
}

.btn{
background:#25D366;
color:white;
padding:14px 24px;
text-decoration:none;
border-radius:6px;
display:inline-block;
margin-top:18px;
}

.section{
padding:70px 20px;
text-align:center;
}

.alt{
background:#f4f4f4;
}

.grid{
display:grid;
grid-template-columns:repeat(auto-fit,minmax(220px,1fr));
gap:25px;
max-width:1000px;
margin:40px auto;
}

.card{
background:white;
padding:25px;
border-radius:8px;
box-shadow:0 5px 12px rgba(0,0,0,0.1);
font-weight:bold;
}

footer{
background:#222;
color:white;
text-align:center;
padding:20px;
}

.whatsapp{
position:fixed;
bottom:20px;
right:20px;
background:#25D366;
color:white;
padding:14px 18px;
border-radius:50px;
text-decoration:none;
font-weight:bold;
}