:root
{
    --color_text_normal: black;
    --color_text_link: blue;

    --color_textfields: white;
    --color_text_placeholder: gray;

    --color_transparency: rgba(0, 0, 0, 0.1);
    --color_dropshadow: rgba(0, 0, 0, 0.25);
    --color_3d_shadow: rgba(0, 0, 0, 0.5);
    --color_3d_highlight: rgba(255, 255, 255, 0.5);
}

.hidden
{
    display: none !important;
}

html
{
    height: 100vh;
    box-sizing: border-box;
}

*, *:before, *:after
{
    box-sizing: inherit;
}

* { color: var(--color_text_normal); }

body
{
    display: grid;
    grid-template:
        "header" auto
        "content_body" 1fr
        /1fr;

    height: 100%;
    margin: 0;

    background-color: var(--color_primary);
}

a
{
    color: var(--color_text_link);
    cursor: pointer;
}

input, select, textarea
{
    background-color: var(--color_textfields);
}

input::placeholder, textarea::placeholder
{
    color: var(--color_text_placeholder);
    opacity: 1;
}

pre
{
    white-space: pre-line;
}

#header
{
    grid-area: header;
    display: flex;
    flex-direction: row;

    margin: 8px;
    background-color: var(--color_transparency);
}
#header button
{
    border: 0;
    cursor: pointer;
    background-color: transparent;
}
.header_element
{
    flex: 1;
    display: flex;
    justify-content: center;
}
.header_element:hover
{
    background-color: var(--color_transparency);
}

#content_body
{
    grid-area: content_body;
    display: grid;
    grid-auto-rows: min-content;
    grid-gap: 8px;

    margin: 8px;
    margin-top: 0;
}

button,
button *
{
    color: var(--color_text_normal);
}
button:disabled
{
    background-color: #cccccc !important;
}
button
{
    border-top: 2px solid var(--color_3d_highlight);
    border-left: 2px solid var(--color_3d_highlight);
    border-right: 2px solid var(--color_3d_shadow);
    border-bottom: 2px solid var(--color_3d_shadow);
}
button:active
{
    border-top: 2px solid var(--color_3d_shadow);
    border-left: 2px solid var(--color_3d_shadow);
    border-right: 2px solid var(--color_3d_highlight);
    border-bottom: 2px solid var(--color_3d_highlight);
}
.gray_button
{
    background-color: #cccccc;
}
.green_button
{
    background-color: #6df16f;
}
.red_button
{
    background-color: #ff4949;
}
.yellow_button
{
    background-color: #ffea57;
}

.tabbed_container
{
    display: flex;
    flex-direction: column;
}
.tabbed_container .tab_buttons
{
    display: flex;
    flex-direction: row;
    flex-wrap: wrap;
}
.tabbed_container .tab_button
{
    /* outline: none; prevents the blue outline left after clicking on it */
    outline: none;
    flex: 1;
    font-family: inherit;
    font-size: 1.3em;
    border-radius: 8px 8px 0 0;
}
.tabbed_container .tab,
.tabbed_container .tab_button
{
    border-width: 2px;
    border-style: solid;
    border-color: #888;
}
.tabbed_container .tab_button_inactive
{
    border-top-color: transparent;
    border-left-color: transparent;
    border-right-color: transparent;
}
.tabbed_container .tab_button_active
{
    border-bottom-color: transparent;
}
.tabbed_container .tab
{
    /* This will be set by javascript after the tabs have been initialized.
    That way, the tab panes don't have a missing top border while the dom is
    loading or if javascript is disabled.
    /*border-top-color: transparent;*/
}

#message_area
{
    display: flex;
    flex-direction: column;
    align-items: center;
    overflow-y: auto;
    background-color: var(--color_transparency);
}
.message_bubble
{
    width: 80%;
    margin: 4px;

    word-wrap: break-word;
}
.message_bubble *
{
    color: var(--color_text_normal);
}
.message_positive
{
    background-color: #afa;
}
.message_negative
{
    background-color: #faa;
}