:root
{
    --visible-color: rgb(255, 255, 255); /* font, borders, ...     */
    --slightly-visible-color: rgba(255, 255, 255, 0.35); /* larger borders */
    --invisible-color: rgb(0, 0, 0);     /* background, essentialy */

    --accent-color-red: rgb(255, 0, 128);
    --accent-color-green: rgb(0, 255, 128);
    --accent-color-blue: rgb(0, 225, 255);
}

*
{
    box-sizing: border-box;
    margin: 0;
    padding: 0;
    color: var(--visible-color);
    text-decoration: none;
    font-family: Arial, Helvetica, sans-serif, monospace;
    font-size: 14px;
    
    scrollbar-color: var(--visible-color) rgba(0, 0, 0, 0.0);
    scrollbar-width: thin;
    transition: 0.2s ease-in-out;
}
a { text-decoration: underline; }

html, body
{
    background: var(--invisible-color);
    color: var(--visible-color);
    font-family: Arial, Helvetica, sans-serif, monospace;

    width: 100%;
    height: 100vh;
    height: 100dvh;
    overflow-x: hidden;
    overflow-y: auto;

    line-height: 1.5;

    display: flex;
    flex-direction: column;
    justify-content: flex-start;
    align-items: flex-start;
}
::selection { color: var(--invisible-color); background: var(--visible-color); }
::-webkit-scrollbar-thumb { color: var(--visible-color); border-radius: 0; }
::-webkit-scrollbar-track { color: transparent; }

h1
{
    font-weight: 500;
    font-size: 24px;
    text-decoration: underline;
    text-decoration-thickness: 1px;
}

strong
{
    text-decoration: underline;
    text-decoration-thickness: 1px;
    font-weight: 700;
}

div
{
    display: flex;
    flex-direction: column;
    justify-content: flex-start;
    align-items: flex-start;
    width: fit-content;
    height: fit-content;
}

button
{
    border: none;
    border-left: 2px solid var(--slightly-visible-color);
    border-radius: 5px;
    background: linear-gradient(to left, rgba(128, 128, 128, 0.2), rgba(0, 0, 0, 0), rgba(0, 0, 0, 0));
    padding: 10px;
    margin: 20px;
    transition: 0.2s ease-in-out;
}

button:hover
{
    background: var(--visible-color);
    color: var(--invisible-color);
}

input, textarea
{
    background: rgba(0, 0, 0, 0.4);
    border: 2px solid var(--slightly-visible-color);
    border-radius: 15px;
    padding: 15px;
    color: var(--visible-color);
    outline: 0;
}