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

:root {
    --fg-bg: #111;
    --fg-color: #fff;
    --accent-color: #49fcd4;
    --accent-text-color: #000;
    --font-primary: system-ui, sans-serif;
    --font-mono: monospace;
    --font-size: 16px;
    --border-radius: 0.15rem;
    --container-width: 640px;
}

*:focus {
    outline-style: none;
    box-shadow: none;
}

html {
    font-size: var(--font-size);
}

body {
    background-color: var(--fg-bg);
    color: var(--fg-color);
    font: 1rem/1.6 var(--font-primary);
    padding: 1rem;
}

input, button {
    border: none;
    font-family: inherit;
    font-size: inherit;
}

.sr-only {
    position: absolute;
    top: -9999em;
    width: 1px;
    height: 1px;
    overflow: hidden;
}

.site-form {
    margin: 2rem auto;
    max-width: var(--container-width);
    padding: 1rem;
    background-color: var(--accent-text-color);
    border-radius: var(--border-radius);
}

@media screen and (min-width: 768px) {
    html, body {
        min-height: 100vh;
        height: 100%;
    }
    body {
        padding: 0;
        display: flex;
        flex-direction: column;
        justify-content: center;
        align-items: center;
    }
    .site-form {
        margin: 0 auto;
        width: var(--container-width);
    }
}

.button {
    cursor: pointer;
    box-shadow: none;
    background-color: var(--accent-color);
    color: var(--accent-text-color);
    text-decoration: none;
    padding: 0.8rem 1.5rem;
    border-radius: var(--border-radius);
    font-size: 0.85rem;
    text-transform: uppercase;
    letter-spacing: .1em;
    text-align: center;
}

.button-submit {
    display: block;
    width: 100%;
}

.form-control {
    padding: 0.6rem 1.2rem;
    background-color: var(--fg-color);
    color: var(--accent-text-color);
    border-radius: var(--border-radius);
    display: block;
    width: 100%;
}

.form-row {
    margin-bottom: 1.5rem;
}

.site-form .form-row + .form-row {
    margin-bottom: 0;
}

.form-output {
    margin-top: 1rem;
    text-align: center;
    font-family: var(--font-mono);
}