*{
margin:0;
padding:0;
box-sizing:border-box;
font-family:Arial,sans-serif;
}

body{
background:#f5f7fa;
}

nav{
display:flex;
justify-content:space-between;
align-items:center;
padding:15px 5%;
background:#fff;
box-shadow:0 2px 10px rgba(0,0,0,.1);
}

.menu{
display:flex;
gap:15px;
}

.menu a{
text-decoration:none;
color:#333;
}

.hero{
min-height:70vh;
display:flex;
justify-content:center;
align-items:center;
text-align:center;
padding:20px;
background:linear-gradient(
rgba(0,0,0,.6),
rgba(0,0,0,.6)
),
url('img/hero-solar.jpg');
background-size:cover;
background-position:center;
}

.hero-content{
color:#fff;
max-width:700px;
}

.hero h1{
font-size:3rem;
margin-bottom:15px;
}

.hero p{
margin-bottom:25px;
line-height:1.7;
}

.btn{
display:inline-block;
padding:12px 25px;
background:#28a745;
color:#fff;
text-decoration:none;
border-radius:5px;
}

.tools{
padding:60px 5%;
}

.tools h2{
text-align:center;
margin-bottom:30px;
}

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

.card{
background:#fff;
padding:25px;
text-decoration:none;
color:#333;
border-radius:10px;
box-shadow:0 5px 15px rgba(0,0,0,.08);
transition:.3s;
}

.card:hover{
transform:translateY(-5px);
}

.card h3{
margin-bottom:10px;
}

footer{
background:#222;
color:#fff;
text-align:center;
padding:20px;
}
footer p{
    font-size:12px;
}

@media(max-width:768px){

nav{
    flex-direction:column;
    gap:10px;
}

.menu{
    flex-wrap:wrap;
    justify-content:center;
}

.hero h1{
    font-size:2rem;
}
footer p{
    font-size:9px;
}

}