```css
body{
    margin:0;
    font-family:Arial, sans-serif;
    background:black;
    color:white;
}

a{
    text-decoration:none;
}

.navbar{
    display:flex;
    justify-content:space-between;
    align-items:center;
    padding:20px 40px;
    background:#000;
}

.logo{
    font-size:38px;
    font-weight:bold;
    color:#00ff99;
}

.nav-links a{
    color:white;
    margin-left:25px;
    font-size:20px;
}

.hero{
    text-align:center;
    padding:120px 20px;
}

.hero h1{
    font-size:90px;
    color:#00ff99;
    margin-bottom:10px;
}

.hero p{
    font-size:28px;
    color:#cccccc;
    margin-bottom:40px;
}

.hero-buttons a{
    display:inline-block;
    margin:10px;
    padding:18px 36px;
    border-radius:14px;
    font-size:24px;
    background:#00cc77;
    color:white;
}

.features{
    padding:80px 20px;
    text-align:center;
}

.features h2{
    font-size:52px;
    color:#00ff99;
    margin-bottom:60px;
}

.feature-grid{
    display:grid;
    grid-template-columns:repeat(auto-fit,minmax(250px,1fr));
    gap:30px;
}

.feature-card{
    background:#111;
    border:2px solid #00ff99;
    border-radius:20px;
    padding:40px 20px;
}

.feature-card h3{
    color:#00ff99;
    font-size:30px;
    margin-bottom:20px;
}

.feature-card p{
    color:#cccccc;
    font-size:18px;
    line-height:1.5;
}

.footer{
    text-align:center;
    padding:40px;
    color:#777;
}
```