Problem with links when building a centered navigation with a logo in the middle

...

<header> 
            <ul class='nav'>
                <li><a href="#sobre">sobre</a></li>
                <li><a href="#contato">contato</a></li>
            </ul>               
            <div class="logo"><a href="#home"><img src="img/img.png"></a></div>
        </header>

html, body {
    height: 100%;
    margin-top: 0;
    padding: 0;
}
.main {
    margin: auto;
}
header {
    padding: 5px 5px -5px 5px;
    text-align: center;
}

#home,
#sobre,
#contato {
    height: 100%;
}

.logo {
    position: absolute;
    margin-left: auto;
    margin-right: auto;
    left: 0;
    right: 18px;
    top: 10px;
}

ul.nav {
    padding: 0;
}

.nav li {
    display: inline;
    text-align: center;
}

.nav li:first-child {
    padding-right: 200px;
}


.nav li a {
    color: #979797;
    text-decoration: none;
    font-family: 'HelveticaNeue', sans-serif;
    font-weight: 100;
    font-size: 1.5em;
    -webkit-transition: color 0.3s;

}
.nav li a:hover {
    color: #0069ff;
    text-decoration: none;
    -webkit-transition: color 0.5s;

}

.nav li {
    display: inline-block;
    text-align: center;
}