* {
    margin: 0;
    padding: 0;
}

body {
    font-family: -apple-system, 'Helvetica Neue', 'Segoe UI', sans-serif;
}

@media (prefers-color-scheme: dark) {
    body {
        background-color: #333;
        color: #CCC;
    }
}
  

a {
    color: #1174e6;
    text-decoration: none;
}

a:hover {
    text-decoration: underline;
}

header {
    background-color: #1E1E1E;
    height: 60px;
    position: fixed;
    top: 0;
    width: 100%;
    z-index: 10;
}

header > div {
    width: 900px;
    margin: auto;
    display: flex;
    align-items: center;
    height: 100%;
}

header .logo {
    margin-right: 10px;
    font-size: 0;
}

header .slogan {
    color: #C8C8C8;
    font-size: 15px;
}

header .nav {
    flex: 1 0 auto;
    text-align: right;
}

header .nav a {
    color: #AAA;
}

header .nav a:hover {
    color: #FFF;
}

main {
    width: 900px;
    padding-top: 60px;
    margin: auto;
}

section {
    margin: 30px 0;
}

.text-orange {
    color: #FF8700;
}

.text-lightgray {
    color: #8C8C8C;
}

footer {
    width: 900px;
    margin: 100px auto 50px auto;
    border-top: 1px solid #EEE;
    padding: 8px 0;
    font-size: 12px;
    color: #999;
}

footer .contact {
    float: right;
}

footer .contact a {
    color: #999;
}

footer .contact a:hover {
    color: #333;
}

@media (prefers-color-scheme: dark) {
    
    footer {
        border-top-color: #555;        
        color: #888;
    }

    footer .contact a {
        color: #888;
    }
    footer .contact a:hover {
        color: #EEE;
    }
}

@media screen and (max-width: 500px) {
    header > div {
        width: 100%;
        padding: 0 15px;
        box-sizing: border-box;
    }

    main {
        width: 100%;
        padding: 60px 25px 40px;
        box-sizing: border-box;
    }
    
    footer {
        width: 100%;
        margin: 30px auto 30px auto;
        padding: 8px 10px;
        font-size: 12px;
        box-sizing: border-box;
    }    
}