:root {
    --text-color: #303030;

    --link-color: steelblue;
    --link-color-hover: orange;

    --standard-spacing: 1rem;
    --half-standard-spacing: 0.5rem;
    --quarter-standard-spacing: 0.25rem;
    --twice-standard-spacing: 2rem;

    --xs-width: 480px;
    --xs-max-width: 479px;
    --sm-width: 600px;
    --sm-max-width: 599px;
    --md-width: 840px;
    --md-max-width: 839px;

    --border-radius: var(--quarter-standard-spacing);

    --panel-width: 400px;
    --panel-width-xs: 300px;

    --menu-width: 100%;
}

@media (min-width: 480px) {
    :root {
        --menu-width: 320px;
    }
}

html,
body,
#root {
    width: 100vw;
    height: 100vh;
    margin: 0;
    padding: 0;
    user-select: none;
    background-color: #f4f8ff;
    color: var(--text-color);
    font-family: Avenir, Helvetica, Arial, sans-serif;
}

h1,
h2,
h3,
h4,
h5,
h6 {
    margin-top: 0;
    margin-bottom: var(--standard-spacing);
}

a {
    color: var(--link-color);
    text-decoration: none;
}

a:hover {
    color: var(--link-color-hover);
    text-decoration: underline;
}

header {
    position: absolute;

    top: auto;
    right: 0;
    bottom: 0;
    left: 0;
    z-index: 1;

    display: flex;
    flex-direction: row;
    align-items: center;
    justify-content: center;
    background-color: rgba(255, 255, 255, 0.75);

    h1 {
        font-size: 20px;
        font-weight: normal;
        line-height: 1;
        margin: 0;
        padding: var(--half-standard-spacing);

        > a {
            color: #4a4a4a;
            font-size: 20px;
            line-height: 1;
            text-decoration: none;
            text-shadow: 1px 1px 2px;
        }
    }

    @media (max-width: 240px) {
        display: none;
    }

    @media (min-width: 600px) {
        top: 0;
        bottom: auto;
        justify-content: flex-end;
        h1 {
            font-size: 24px;
            padding: 24px 16px;

            > a {
                font-size: 24px;
            }
        }
    }
}

main {
    width: 100%;
    height: 100%;
}

.row {
    display: flex;
    flex-direction: row;
    align-items: center;
}

.row > * {
    margin-right: var(--quarter-standard-spacing);
}

.row > *:last-child {
    margin-right: 0;
}

.lead {
    font-size: 112%;
    margin-bottom: var(--standard-spacing);
}

.small {
    font-size: 92%;
}

@keyframes blinker {
    0% {
        opacity: 1;
    }
    50% {
        opacity: 0.25;
    }
    100% {
        opacity: 1;
    }
}

@keyframes fade-in {
    from {
        opacity: 0;
    }
    to {
        opacity: 1;
    }
}

.icon-button {
    display: inline-flex;
    align-items: center;
    justify-content: center;

    width: 32px;
    height: 32px;

    margin: var(--quarter-standard-spacing);
    padding: 0;

    background-color: white;
    color: var(--link-color);

    border: 1px solid white;
    border-radius: 1px;

    font-size: 20px;
    line-height: 1;

    > .bi {
        font-weight: bold;
    }

    &:hover {
        border: 1px solid #f0f0f0;
        box-shadow: 1px 1px 2px;
        cursor: pointer;
    }

    &:disabled {
        color: gray;
        cursor: auto;
        border: none;
        box-shadow: none;
    }
}