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

body{
    background:#0d1117;
    color:#fff;
    font-family:Arial,Helvetica,sans-serif;
}

header{
    background:#161b22;
    padding:15px 20px;

    display:flex;
    justify-content:space-between;
    align-items:center;

    border-bottom:2px solid #FFD700;
}

.logo{
    font-size:28px;
    font-weight:bold;
}

nav{
    display:flex;
    gap:20px;
}

nav a{
    color:white;
    text-decoration:none;
    padding:10px;
}

nav a:hover,
nav a.ativo{
    background:#FFD700;
    color:black;
    border-radius:6px;
}

.container{
    width:95%;
    max-width:1400px;
    margin:auto;
}

footer{
    margin-top:50px;
    background:#161b22;
    text-align:center;
    padding:30px;
}

.card{
    background:#161b22;
    border-radius:12px;
    padding:15px;
}

@media(max-width:900px){

header{
    flex-direction:column;
}

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

}