html {
	font-family: -apple-system, BlinkMacSystemFont, "SF Pro Text",
	           "SF Pro Display", "Helvetica Neue", Helvetica,
	           Arial, sans-serif;
	-webkit-font-smoothing: antialiased;
	-moz-osx-font-smoothing: grayscale;
}

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

.centered {
    text-align: center;
}

body {
    background: #ffffff;
    color: #222;
    line-height: 1.6;
    font-size: 16px;
}

main {
    max-width: 1292px;
    margin: 0 auto;
    padding: 130px 20px 50px;
}

/* Headings */
h1, h2, h3, h4 {
    font-family: -apple-system, BlinkMacSystemFont, "SF Pro Display",
               "SF Pro Text", "Helvetica Neue", Helvetica,
               Arial, sans-serif;
    font-weight: 700;
    line-height: 1.3;
    margin-bottom: 0.3em;
}

h1 { 
    font-size: 3.6rem; 
    color: #000;
}

h2 { 
    font-size: 2.2rem;
    font-weight: 600;
    color: #555;
    margin-bottom: 1.0em;
}

a {
    color: #007aff;
    text-decoration: none;
}

a:hover {
    text-decoration: underline;
}

#device-screenshots {
    margin: 50px auto 50px;
}

#feedback {
    display: inline-block;
    text-align: center;
    background-color: #ddd;
    padding: 30px 60px;
    text-align: center;
    font-size: 2.0em;
    font-weight: 600;
    line-height: 150%;
    margin: 0 auto; 
    border-radius: 40px;
}

#email {
    font-weight: 700;
    font-size: 1.5em;
}

@media (prefers-color-scheme: dark) {
    body {
        background: #121212;
        color: #ddd;
    }

    h1 { 
        color: #fff;
    }

    h2 { 
        color: #ddd;
    }

    a { color: #0a84ff; }

    #feedback {
        background-color: #222;
        color: #eee;
    }
}

header {
    text-align: center;
}

header img {
    display: block;
    margin: 0 auto;
}

@media only screen and (max-width: 640px) {
    main {
        padding: 80px 16px 50px;
    }

    h1 { 
        font-size: 2.9rem; 
    }

    h2 { 
        font-size: 1.6rem;
    }

    #feedback {
        padding: 20px 30px;
        border-radius: 30px;
        font-size: 1.1em;
    }

    #email { 
        font-size: 1.5rem;
    }
}