```css
/* ==========================
   SATCOM RADIO
   style.css
========================== */

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

body{
    font-family:Arial,Helvetica,sans-serif;
    background:#ffffff;
    color:#222;
    line-height:1.7;
}

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

a{
    text-decoration:none;
}

img{
    max-width:100%;
    display:block;
}

/* TOP BAR */

.topbar{
    background:#03101f;
    color:#fff;
    font-size:13px;
    padding:10px 0;
}

.topbar-inner{
    display:flex;
    justify-content:space-between;
    flex-wrap:wrap;
    gap:15px;
}

/* HEADER */

.site-header{
    background:#071f38;
    position:sticky;
    top:0;
    z-index:999;
}

.navbar{
    display:flex;
    justify-content:space-between;
    align-items:center;
    padding:18px 0;
}

.logo{
    color:#fff;
    font-size:30px;
    font-weight:700;
}

.logo span{
    color:#4da3ff;
}

.nav-menu{
    display:flex;
    list-style:none;
    gap:25px;
}

.nav-menu a{
    color:#fff;
    font-weight:600;
}

.nav-menu a:hover{
    color:#4da3ff;
}

/* HERO */

.hero{
    min-height:560px;
    background:
    linear-gradient(rgba(0,20,55,.65),rgba(0,20,55,.65)),
    url('https://images.unsplash.com/photo-1462331940025-496dfbfc7564?auto=format&fit=crop&w=1800&q=80');
    background-size:cover;
    background-position:center;
    display:flex;
    align-items:center;
    color:#fff;
}

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

.hero h1{
    font-size:58px;
    line-height:1.1;
    margin-bottom:20px;
}

.hero p{
    font-size:21px;
    margin-bottom:30px;
}

.btn{
    display:inline-block;
    padding:15px 32px;
    border-radius:6px;
    font-weight:bold;
    transition:.3s;
}

.btn-primary{
    background:#1677ff;
    color:#fff;
}

.btn-primary:hover{
    background:#005ee0;
}

.btn-secondary{
    background:#fff;
    color:#071f38;
    margin-left:10px;
}

/* PAGE BANNERS */

.page-banner{
    height:280px;
    background:
    linear-gradient(rgba(0,20,55,.65),rgba(0,20,55,.65)),
    url('https://images.unsplash.com/photo-1462331940025-496dfbfc7564?auto=format&fit=crop&w=1800&q=80');
    background-size:cover;
    background-position:center;
    display:flex;
    align-items:center;
    justify-content:center;
    text-align:center;
    color:#fff;
}

.page-banner h1{
    font-size:52px;
}

/* SECTIONS */

.section{
    padding:80px 0;
}

.section-title{
    text-align:center;
    color:#071f38;
    font-size:40px;
    margin-bottom:15px;
}

.section-subtitle{
    text-align:center;
    max-width:850px;
    margin:auto;
    margin-bottom:50px;
}

/* CARDS */

.cards{
    display:grid;
    grid-template-columns:repeat(auto-fit,minmax(250px,1fr));
    gap:25px;
}

.card{
    background:#fff;
    padding:35px;
    border-radius:12px;
    box-shadow:0 3px 15px rgba(0,0,0,.08);
    text-align:center;
}

.card h3{
    color:#071f38;
    margin-bottom:15px;
}

/* ABOUT GRID */

.about-grid{
    display:grid;
    grid-template-columns:1fr 1fr;
    gap:50px;
    align-items:center;
}

.about-image{
    background:
    linear-gradient(rgba(0,20,55,.15),rgba(0,20,55,.15)),
    url('https://images.unsplash.com/photo-1516321497487-e288fb19713f?auto=format&fit=crop&w=1200&q=80');
    background-size:cover;
    background-position:center;
    min-height:450px;
    border-radius:12px;
}

/* CTA */

.cta-banner{
    background:#071f38;
    color:#fff;
    padding:40px;
    border-radius:12px;
    display:flex;
    justify-content:space-between;
    align-items:center;
    gap:20px;
    flex-wrap:wrap;
}

/* CONTACT */

.contact-grid{
    display:grid;
    grid-template-columns:1fr 1fr;
    gap:40px;
}

.contact-card{
    background:#f8fbff;
    padding:30px;
    border-radius:12px;
}

.form-group{
    margin-bottom:20px;
}

.form-group label{
    display:block;
    margin-bottom:8px;
    font-weight:600;
}

.form-control{
    width:100%;
    padding:14px;
    border:1px solid #ccc;
    border-radius:6px;
}

textarea.form-control{
    min-height:160px;
}

/* CONTENT */

.content{
    padding:80px 0;
}

.content h2{
    color:#071f38;
    margin-top:30px;
    margin-bottom:15px;
}

.content p,
.content li{
    margin-bottom:15px;
}

/* FOOTER */

.footer{
    background:#05101f;
    color:#fff;
    padding:70px 0 25px;
}

.footer-grid{
    display:grid;
    grid-template-columns:repeat(3,1fr);
    gap:40px;
}

.footer h3{
    margin-bottom:15px;
}

.footer a{
    color:#d7e5ff;
    display:block;
    margin-bottom:10px;
}

.footer-bottom{
    margin-top:40px;
    padding-top:20px;
    border-top:1px solid rgba(255,255,255,.15);
    text-align:center;
    font-size:14px;
}

/* MOBILE */

@media(max-width:768px){

    .navbar{
        flex-direction:column;
        gap:20px;
    }

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

    .hero h1{
        font-size:40px;
    }

    .page-banner h1{
        font-size:36px;
    }

    .about-grid,
    .contact-grid,
    .footer-grid{
        grid-template-columns:1fr;
    }

}
```