```css
*{
    margin:0;
    padding:0;
    box-sizing:border-box;
}

body{
    font-family:Arial, Helvetica, sans-serif;
    background:#f5f5f5;
    color:#333;
    line-height:1.6;
}

.container{
    width:90%;
    max-width:1200px;
    margin:auto;
}

/* HEADER */

header{
    background:#003366;
    padding:15px 0;
}

header .container{
    display:flex;
    justify-content:space-between;
    align-items:center;
    flex-wrap:wrap;
}

.logo img{
    height:70px;
    width:auto;
}

nav{
    display:flex;
    gap:25px;
}

nav a{
    color:white;
    text-decoration:none;
    font-weight:bold;
}

nav a:hover{
    color:#ff9900;
}

/* HERO */

.hero{
    background:#0055aa;
    color:white;
    padding:80px 0;
}

.hero h1{
    font-size:42px;
    margin-bottom:20px;
    max-width:900px;
}

.hero p{
    font-size:20px;
    margin-bottom:10px;
}

/* SECTIONS */

.section{
    padding:70px 0;
}

.section h2{
    font-size:36px;
    margin-bottom:25px;
    color:#003366;
}

.section h3{
    margin-top:25px;
    color:#003366;
}

.light{
    background:white;
}

/* WHY CHOOSE */

.card-grid{
    display:grid;
    grid-template-columns:repeat(auto-fit,minmax(240px,1fr));
    gap:20px;
    margin-top:25px;
}

.card{
    background:white;
    padding:25px;
    border-radius:10px;
    box-shadow:0 2px 10px rgba(0,0,0,.08);
    font-size:18px;
    font-weight:bold;
}

/* PRODUCTS */

.product-grid{
    display:grid;
    grid-template-columns:repeat(auto-fit,minmax(320px,1fr));
    gap:30px;
}

.product-card{
    background:white;
    border-radius:10px;
    overflow:hidden;
    box-shadow:0 2px 12px rgba(0,0,0,.08);
}

.product-card img{
    width:100%;
    height:260px;
    object-fit:cover;
    display:block;
}

.product-card h3{
    padding:20px 20px 10px;
}

.product-card p{
    padding:0 20px;
}

.product-card ul{
    padding:10px 40px 25px;
}

.product-card li{
    margin-bottom:6px;
}

/* CONTACT */

form{
    max-width:700px;
}

input,
textarea{
    width:100%;
    padding:12px;
    margin-bottom:15px;
    border:1px solid #ccc;
    border-radius:5px;
}

button{
    background:#ff9900;
    color:white;
    border:none;
    padding:12px 25px;
    border-radius:5px;
    cursor:pointer;
    font-size:16px;
}

button:hover{
    background:#e68a00;
}

/* FOOTER */

footer{
    background:#003366;
    color:white;
    text-align:center;
    padding:25px;
    margin-top:50px;
}

/* MOBILE */

@media(max-width:768px){

    header .container{
        flex-direction:column;
        gap:15px;
    }

    nav{
        flex-wrap:wrap;
        justify-content:center;
    }

    .hero{
        padding:60px 0;
    }

    .hero h1{
        font-size:30px;
    }

    .hero p{
        font-size:18px;
    }

    .section h2{
        font-size:28px;
    }

    .logo img{
        height:55px;
    }

}
```