/*html (.html, :root) and body (.page)*/

.html {
    height: 100%;
}

:root {
    font-size: large;
    /*variables*/
    /*colors*/
    --black: #000000;
    --darkgray: #212121;
    --lightblue: #0066ff; /*#2787f5*/
    --blue: #0045f5;
    --white: #ffffff;
    /*common*/
    --text-color: var(--black);
    --page-bg-color: var(--white);
    /*hf - header and footer*/
    --hf-text-color: var(--white);
    --hf-bg-color: var(--darkgray);
    /*main-content > container (panel)*/
    --panel-border-color: var(--darkgray);
    /*logo*/
    --logo-border-color: var(--darkgray);
    --logo-bg-color: var(--white);
    /*buttons*/
    --b-text-color: var(--white);
    --b-icon-color: var(--white);
    --b-lining-icon-color: var(--white);
    --b-lining-color: var(--darkgray);
    /*button-theme: lightblue*/
    --lightblue-text-color: var(--white);
    --lightblue-lining-icon-color: var(--lightblue);
    --lightblue-lining-color: var(--white);
    --lightblue-border-color: var(--lightblue);
    --lightblue-background-color: var(--lightblue);
    /*button-theme: lightblue > :hover*/
    --lightblue-lining-icon-color-hover: var(--blue);
    --lightblue-border-color-hover: var(--blue);
    --lightblue-background-color-hover: var(--blue);
}

.page {
    display: grid;
    grid-template-columns: 1fr;
    grid-template-rows: 60px 1fr 60px;
    gap: 10px;
    border: 0;
    min-height: 100%;
    margin: 0 auto;
    outline: 0;
    padding: 0;
    min-width: 320px;
    width: 100%;
    color: var(--text-color, #000000);
    font-family: "Noto Sans", "Arial", "Helvetica", sans-serif;
    font-style: normal;
    font-variant: normal;
    font-weight: normal;
    line-height: 1.4;
    background-color: var(--page-bg-color, #ffffff);
}

/*service-classes*/

.visually-hidden {
    position: absolute;
    border: 0;
    height: 1px;
    margin: -1px;
    outline: 0;
    padding: 0;
    width: 1px;
    white-space: nowrap;
    clip-path: inset(100%);
    clip: rect(0, 0, 0, 0);
    overflow: hidden;
}

/*text*/

.text--bold {
    font-weight: bold;
}

.text--italic {
    font-style: italic;
}

.text--big {
    font-size: x-large;
}

/*buttons*/

.button {
    position: relative;
    display: inline-block;
    border: 0.2em solid lightgray;
    min-height: calc(1em * 1.6);
    margin: 0;
    outline: 0;
    padding: 0.4em 1em;
    min-width: calc(1em * 2.5);
    color: var(--b-text-color, #ffffff);
    line-height: 1.6;
    font-size: inherit;
    font-weight: bold;
    text-align: center;
    text-decoration: none;
    text-transform: uppercase;
    white-space: nowrap;
    background-color: lightgray;
    -webkit-border-radius: 3em;
    -moz-border-radius: 3em;
    border-radius: 3em;
    cursor: pointer;
}

.button__icon--lining {
    position: absolute;
    top: 50%;
    left: 50%;
    z-index: 10;
    height: calc(1em * 3);
    width: calc(1em * 3);
    fill: var(--b-lining-icon-color, #ffffff);
    -webkit-transform: translate(-50%, -50%);
    -moz-transform: translate(-50%, -50%);
    -o-transform: translate(-50%, -50%);
    transform: translate(-50%, -50%);
}

.button__lining::after {
    content: "";
    position: absolute;
    top: 50%;
    left: 50%;
    z-index: 1;
    height: calc(1em * 2);
    width: calc(1em * 2);
    background-color: var(--b-lining-color, #212121);
    -webkit-transform: translate(-50%, -50%);
    -moz-transform: translate(-50%, -50%);
    -o-transform: translate(-50%, -50%);
    transform: translate(-50%, -50%);
}

/*buttons-theme: lightblue*/

.button--theme_lightblue {
    border-color: var(--lightblue-border-color, #0066ff);
    background-color: var(--lightblue-background-color, #0066ff);
}

.button--theme_lightblue.button__lining::after {
    background-color: var(--lightblue-lining-color, #ffffff);
}

.button--theme_lightblue .button__icon--lining {
    fill: var(--lightblue-lining-icon-color, #0066ff);
}

/*buttons-theme: lightblue > :hover and :focus-visible (keyboard)*/

.button--theme_lightblue:focus-visible,
.button--theme_lightblue:hover {
    border-color: var(--lightblue-border-color-hover, #0045f5);
    background-color: var(--lightblue-background-color-hover, #0045f5);
}

.button--theme_lightblue:focus-visible .button__icon--lining,
.button--theme_lightblue:hover .button__icon--lining {
    fill: var(--lightblue-lining-icon-color-hover, #0045f5);
}

/*buttons-theme: lightblue > :active*/

.button--theme_lightblue:active {
    opacity: 0.7;
}

/*main-header and main-footer*/

.page__main-header,
.page__main-footer {
    color: var(--hf-text-color, #ffffff);
    background-color: var(--hf-bg-color, #212121);
}

/*main-header*/

.page__main-header {
    margin: 0;
    padding: 0;
    font-size: 0;
}

/*main-content*/

.page__main-content {
    display: flex;
    margin: 0;
    padding: 25px 0;
    padding-bottom: 30px;
}

/*main-content > container*/

.main-content__container {
    position: relative;
    margin: auto auto;
    padding: 0 0.5em;
    padding-bottom: 20px;
    max-width: 452px;
}

/*main-content > logo-link*/

.main-content__logo-link {
    position: relative;
    display: block;
    margin: 0 auto;
    margin-bottom: 1em;
    padding: 0.25em;
    width: 240px;
    text-decoration: none;
    background-color: var(--logo-bg-color, #ffffff);
    -webkit-border-radius: 50%;
    -moz-border-radius: 50%;
    border-radius: 50%;
}

/*main-content > text*/

.main-content__paragraph {
    margin: 0;
    margin-bottom: 1em;
    padding: 0;
}

.main-content__paragraph:last-of-type {
    margin-bottom: 2em;
}

/*main-content > button*/

.main-content__button {
    display: block;
    margin: 0 auto;
    width: 12em;
}

/*main-footer*/

.main-footer {
    display: flex;
}

.main-footer__copyright {
    margin: auto auto;
    text-align: center;
}

.main-footer__copyright:hover {
    text-decoration: underline;
}

@media all and (min-width: 484px) {

    /*main-content*/

    .page__main-content {
        padding-top: 157px;
        padding-bottom: calc(30px - 0.3em);
    }

    /*main-content > container*/

    .main-content__container {
        z-index: 10;
        border: 0.3em solid var(--panel-border-color, #212121);
        padding-top: 147px;
        padding-right: 1em;
        padding-left: 1em;
        background-color: #ffffff;
        -webkit-border-radius: 50px;
        -moz-border-radius: 50px;
        border-radius: 50px;
    }

    .main-content__container::after {
        content: "";
        position: absolute;
        top: 0;
        left: 50%;
        z-index: auto;
        width: calc(252px + 0.25em * 2);
        height: calc(252px + 0.25em * 2);;
        background-color: var(--logo-border-color, #212121);
        -webkit-border-radius: 50%;
        -moz-border-radius: 50%;
        border-radius: 50%;
        -webkit-transform: translate(-50%, -50%);
        -moz-transform: translate(-50%, -50%);
        -o-transform: translate(-50%, -50%);
        transform: translate(-50%, -50%);
        clip-path: inset(0 0 50% 0);
    }

    /*main-content > logo-link*/

    .main-content__logo-link {
        position: absolute;
        top: 0;
        left: 50%;
        z-index: 3;
        -webkit-transform: translate(-50%, -50%);
        -moz-transform: translate(-50%, -50%);
        -o-transform: translate(-50%, -50%);
        transform: translate(-50%, -50%);
    }
}