/*********************/
/***** VARIABLES *****/
/*********************/

:root {

    /***** COLOR *****/

    --clr-dark: 18, 18, 18;
    --clr-light: 237, 237, 237;
    --clr-mid: 117, 117, 117;

    /***** FONT FAMILIES *****/

    --ff: "Open Sans", Arial, Helvetica, sans-serif;

    /***** FONT SIZES *****/

    --fs-mfb: 1.125rem;
    --fs-mfh1: 1.4rem;

    /***** SWITCH SIZES *****/

    --sws-mf: 30px;
}

/*****************/
/***** RESET *****/
/*****************/

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

body, h1, h2, h3, h4, h5, p, figure {
    margin: 0;
}

body {
    min-height: 100vh;
}

input, button, textarea, select {
    font-family: inherit;
}

img, picture {
    max-width: 100%;
    display: block;
}

@media (prefers-reduced-motion: reduce) {  
    *,
    *::before,
    *::after {
      animation-duration: 0.01ms !important;
      animation-iteration-count: 1 !important;
      transition-duration: 0.01ms !important;
      scroll-behavior: auto !important;
    }
}

/***************************/
/***** UTILITY CLASSES *****/
/***************************/

.grid {
    display: grid;
}

.flex {
    display: flex;
}

.uppercase {
    text-transform: uppercase;
}

.not-visible {
    display: none;
}

.sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border: 0;
}

/**************************/
/***** GENERAL STYLES *****/
/**************************/

header, main {
    padding-block-end: 1em;
    border-bottom: 1px solid rgba( var(--clr-mid), 1 );
}

body {
    background-color: rgba( var(--clr-dark), 1 );
    color: rgba( var(--clr-light), 1 );
    font-family: var(--ff);
    font-size: var(--fs-mfb);
    padding-block: 1em;
    transition: all 0.25s ease-in-out;
}

.reverse {
    background-color: rgba( var(--clr-txt), 1 );
    color: rgba( var(--clr-bckg), 1 );
}

h1 {
    font-weight: 700;
    font-size: var(--fs-mfh1);
    letter-spacing: 1px;
}

h2 {
    text-align: center;
    padding: 0;
    margin: 0;
}

.header-container {
    width: 90%; 
    grid-template-columns: 50px 5px 1fr 1fr;
    margin-inline: auto;
    align-items: center;
}

.container-main {
    max-width: 80%;
    padding-block: 3em 3em;
    padding-inline: 3em; 
    border: 1px solid rgba( var(--clr-mid), 1 );
    border-radius: 10em;
    margin-block: 1em;
    margin-inline: auto;
}

.container-main p {
    text-align: left;
    margin-block: 2em 4em;
}

.switch {
    width: var(--sws-mf);
    aspect-ratio: 10 / 10;
    display: block;
    background-color: rgba( var(--clr-light), 1 );
    color: rgba( var(--clr-dark), 1 );
    text-align: center;
    font-size: var(--fs-mfb);
    border: none;
    border-radius: 2em;
    margin-block: 1em;
    margin-inline: auto;
    cursor: pointer;
}

.rotate{
    transform:rotate(180deg);
}

.switch-reverse {
    background-color: rgba( var(--clr-dark), 1 );
}


/******************/
/***** HEADER *****/
/******************/

.header-title {
    grid-column: 3 / 5;
}

.header-link {
    order: -1;
    grid-column: 1 / 2;
    width: 45px;
}




/*****************/
/***** TESTS *****/
/*****************/