:root {
    --space-small: 20px;
    --space-standard: 50px;
    --background-color: #dfdfdf;
    --color: 0, 0, 0;
}

a {
    color: #666;
    text-decoration: none;
}

body {
    align-items: center;
    background-attachment: fixed;
    background-color: var(--background-color);
    background-repeat: no-repeat;
    color: rgb(var(--color));
    display: flex;
    flex-flow: column;
    font-family: Helvetica;
    justify-content: center;
    margin: 0;
    padding: 0;
}

footer {
    text-align: center;
}

header {
    align-items: center;
    display: flex;
    flex-flow: row;
    justify-content: space-between;
}

header, footer {
    align-self: stretch;
    padding: var(--space-small) var(--space-standard) var(--space-small) var(--space-standard);
}

img {
    padding: 0px 5% 5% 5%;
    width: 90%;
}

img.app-icon {
    float: right;
    padding: 0px 5% 5% 5%;
    width: 25%;
    filter: drop-shadow(0px 1px 2px #0009);
}

main {
    display: flex;
    flex-flow: row wrap;
    justify-content: space-around;
    max-width: 1500px;
    padding: var(--space-standard);
}

main h1 {
    font-size: 3.5em;
    margin: 0;
    padding: 0;
}

nav ul {
    align-items: center;
    display: flex;
    flex-flow: row;
    list-style-type: none;
    margin: 0;
    padding: 0;
}

nav ul li {
    margin-bottom: var(--space-small);
    margin-left: 20px;
    margin-right: 20px;
    margin-top: var(--space-small);
}

p {
	margin-bottom: 1.5em;
}

section {
    flex: 100%;
}

section.feature {
    display: flex;
}

small {
	color: rgb(var(--color), 0.4);
}

small h1, small h2 {
	font-size: 1em;
}

@media screen and (max-width: 800px) {
    header {
        align-items: stretch;
        flex-flow: column;
    }
    
    img {
        padding: 0px;
        width: 100%;
    }
    
    main {
        max-width: 90%;
    }
    
    nav ul {
        align-items: stretch;
        flex-flow: column;
    }
    
    nav ul li {
        margin-left: 0px;
        margin-right: 0px;
    }

    section.feature {
        flex-direction: column;
    }
}