:root {
    --main-colour: #03989e;
    --old-main-colour: #55a1a2;
    --right: #8D8;
    --valid: #40AC40;
    --wrong: #FCC;
    --darkest: #000;
    --gray-3: #DDD;
    --gray-2: #EAEAEA;
    --gray-1: #F5F5F5;
    --lightest: #FFF;
    --transparent: rgba(0, 0, 0, 0);
    --50-opaque-black: rgba(0, 0, 0, 0.5);
    --80-opaque-black: rgba(0, 0, 0, 0.8);
    --small-width: 500px;
    --responsive-width: calc(var(--small-width) + (100vw - var(--small-width)) / 3);
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    visibility: visible;
    opacity: 1;
    font-family: 'Didact Gothic', serif;
    font-size: 18px;
    letter-spacing: 0.0075em;
}

h1 {
    font-size: 1.7em;
}

h2 {
    font-size: 1.2em;
}

a {
    text-decoration: none;
    color: inherit;
}

/*
table, thead, tbody, th, tr, td {
	border: 1px solid black;
	padding: 1px;
}
*/

.display-none {
    display: none;
}

.text-center {
    text-align: center;
}

.hidden {
    position: fixed;
    opacity: 0;
}

.focus-underline {
    outline: 0;
}

.focus-underline:focus {
    text-decoration: underline;
}

.page-header {
    align-items: center;
    display: flex;
    justify-content: space-between;
    background-color: var(--main-colour);
    color: var(--lightest);
}

.top-menu {
    margin: 1em;
    display: flex;
    align-items: center;
}

.page-header li {
    display: inline-block;
    margin: 0.05em;
    word-spacing: -0.05em;
}

.top-menu-part:first-child li {
    margin: 0.15em;
    word-spacing: -0.05em;
}

.top-menu-part {
    margin: 0 0.5em;
    height: 100%;
}

.top-menu-part:first-child {
    display: block;
}

.top-menu-image {
    width: 1em;
    display: block;
}

footer {
    margin-top: auto;
    background-color: var(--main-colour);
    color: var(--lightest);
}

.footer-part {
    display: flex;
    justify-content: center;
    align-items: center;
    flex-wrap: wrap;
    margin: 0.5em;
}

.footer-part img {
    display: inline-block;
    margin: auto 1em;
    width: 150px;
}

.footer-part p {
    display: flex;
    justify-content: center;
    align-content: center;
    margin: auto 1em;
    font-size: 0.6em;
    text-align: center;
}

.hamburger {
    border: none;
    background-color: var(--transparent);
}

.menu-chosen {
    font-weight: 600;
}

.top-menu .logo {
    display: flex;
    justify-content: center;
    align-items: center;
    padding: 0.25em;
    border: 2px solid var(--lightest);
    border-radius: 100%;
    width: 2.5em;
    height: 2.5em;
    margin-right: 0.5em;
    background: var(--lightest);
}

.logo > * {
    width: 100%;
}

.question {
    width: var(--responsive-width);
    margin: 1em auto;
    -moz-user-select: none;
    -webkit-user-select: none;
    -ms-user-select: none;
    user-select: none;
    background-color: var(--lightest);
}

.question-text {
    margin: 1.5em;
    margin-bottom: 1em;
}

.question-comment {
    padding: 2em;
    font-size: 0.85em;
    word-spacing: 0.075em;
}

.body-container {
    display: flex;
    flex-direction: column;
    min-height: 100vh;
    background-color: var(--gray-1);
}

.greetings-container {
    display: flex;
    flex-direction: column;
}

.greetings {
    width: var(--responsive-width);
    margin: 1em auto;
}

.article-main h2 {
    margin: 1em;
}

.article-main p {
    margin: 1em;
}

label {
    display: flex;
    align-items: center;
    padding: 0.5em 2em;
    transition: background ease-in-out 0.7s;
}

input:checked + label {
    background-color: var(--gray-2);
}

input[type="radio"]:focus + label {
    outline: var(--gray-3) dotted medium;
}

label:before {
    content: "";
    display: inline-block;
    height: 1em;
    width: 1em;
    background-color: var(--darkest);
    border-radius: 50%;
    transform: scale(0);
    transition: all 0.2s;
    flex-shrink: 0;
}

input:checked + label:before {
    background-color: var(--main-colour);
    transform: scale(0.4);
    transition: all 0.5s;
    box-shadow: var(--80-opaque-black) 0 0.1em 0.2em -0.1em;
}

.circle {
    display: inline-block;
    height: 1em;
    width: 1em;
    position: relative;
    right: 1em;
    border-radius: 50%;
    box-shadow: inset var(--50-opaque-black) 0 0.1em 0.2em -0.1em;
    flex-shrink: 0;
}

.answer {
    display: inline-block;
}

input:checked + .answer-wrong {
    background-color: var(--wrong);
}

.answer-right {
    background-color: var(--right) !important;
}

button[type="submit"], .button {
    background-color: var(--lightest);
    font-size: inherit;
    padding: 1em;
    margin: 1em auto;
    border: none;
    transition: all ease-in-out 0.4s;
}

form.main-column-flex-container:valid button[type="submit"] {
    background-color: var(--valid);
    color: var(--lightest);
}

form.main-column-flex-container:invalid button[type="submit"] {
    background-color: var(--wrong);
}

form.main-column-flex-container:valid button[type="submit"]::after {
    content: "Sprawdź odpowiedzi";
    -moz-user-select: none;
    -webkit-user-select: none;
    -ms-user-select: none;
    user-select: none;
}

form.main-column-flex-container:invalid button[type="submit"]::after {
    content: "Odpowiedz na wszystkie pytania";
    -moz-user-select: none;
    -webkit-user-select: none;
    -ms-user-select: none;
    user-select: none;
}

.result-container {
    display: flex;
    flex-direction: column;
}

.result {
    margin: 0 auto;
}

.main-column-flex-container {
    display: flex;
    flex-direction: column;
}

.main {
    margin: 0 auto;
    width: 50%;
}

.categories-container {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    align-content: center;
    margin: 1em auto;
    gap: 2em;
    -moz-user-select: none;
    -webkit-user-select: none;
    -ms-user-select: none;
    user-select: none;
}

.category {
    display: flex;
    justify-content: center;
    padding: 1em;
    flex-grow: 1;
    flex-basis: 0;
    background-color: var(--lightest);
}

.category > p {
    white-space: nowrap;
}

.post-container {
    width: 50%;
    text-align: center;
}

.feed-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    list-style: none;
    row-gap: 1em;
    column-gap: 1em;
}

.post-grid {
    margin: 1em auto;
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    grid-template-rows: fit-content(0);
    border: 1px var(--gray-3) solid
    /*list-style: none;*/
    /*row-gap: 1em;*/
    /*column-gap: 1em;*/
}

.post-image {
    grid-column-start: 1;
    grid-column-end: 3;
}

.post-text {
    overflow: scroll;
    scrollbar-width: none;
    padding: 1em;
    font-size: 0.85em;
    text-align: left;
    background-color: var(--lightest);
}

.margin-top-bottom-1em {
    margin: 1em 0;
}

.margin-05rem {
    margin: 0.5rem;
}

.margin-1rem {
    margin: 1rem;
}

.text-uppercase {
    text-transform: uppercase;
}

.square-tile {
    background-size: cover;
    background-position: center;
    aspect-ratio: 1 / 1;
}

.pagination {
    text-align: center;
}

.pagination li {
    display: inline-block;
}

.pagination-tile {
    display: inherit;
    box-shadow: 1px 1px 3px 0px var(--50-opaque-black);
    padding: 5px;
    width: 2em;
    font-weight: 400;
    margin: 0 2px;
    transition: background-color 0.25s, color 0.25s;
}

.pagination-tile:hover {
    background-color: var(--main-colour);
    color: var(--lightest);
}

.pagination-tile-current {
    background-color: var(--main-colour);
    color: var(--lightest);
}

.main-button {
    background-color: var(--lightest);
    max-width: fit-content;
    margin: 1em auto;
    padding: 1em;
}

/* start CSS slider */

.slider {
    width: 100%;
    text-align: center;
    overflow: hidden;
    position: relative;
}

.slides {
    display: flex;

    overflow-x: auto;
    scroll-snap-type: x mandatory;


    scroll-behavior: smooth;
    -webkit-overflow-scrolling: touch;

    -ms-overflow-style: none; /* for Internet Explorer, Edge */
    scrollbar-width: none; /* for Firefox */

    /*
    scroll-snap-points-x: repeat(300px);
    scroll-snap-type: mandatory;
    */
}

.slides::-webkit-scrollbar {
    display: none;
}

.slides::-webkit-scrollbar-thumb {
    background: var(--darkest);
    border-radius: 10px;
}

.slides::-webkit-scrollbar-track {
    background: transparent;
}

.slides .square-tile {
    scroll-snap-align: start;
    flex-shrink: 0;
    width: 100%;
    aspect-ratio: 1 / 1;
    transform-origin: center center;
    transform: scale(1);
    transition: transform 0.5s;
    position: relative;

    display: flex;
    justify-content: center;
    align-items: center;
    font-size: 100px;
}

.slider .slide-anchor {
    display: inline-flex;
    width: 1.25rem;
    height: 1.25rem;
    background: var(--main-colour);
    border: 0.275em var(--lightest) solid;
    text-decoration: none;
    align-items: center;
    justify-content: center;
    border-radius: 50%;
    margin: 0 0 0.5rem 0;
    position: relative;
}

.slider .slide-anchor:active {
    top: 1px;
}

.slider .slide-anchor:focus {
    background: var(--darkest);
}

.slider-nav {
    position: absolute;
    z-index: 1;
    bottom: 0;
    left: 50%;
    translate: -50%;
}

/* stop CSS slider */

@media screen and (min-width: 500px) {
    html {
        font-size: calc(18px + (100vw - var(--small-width)) / 175);
    }
}

@media screen and (max-width: 630px) {
    .page-header {
        flex-direction: column;
    }
}

@media screen and (max-width: 500px) {
    .question {
        width: 100%;
    }

    .post-grid {
        display: block;
    }
}

@media screen and (500px < width <= 1500px) {
    .feed-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .main {
        width: var(--responsive-width);
    }
}

@media screen and (width <= 500px) {
    .feed-grid {
        grid-template-columns: repeat(1, 1fr);
    }

    .main {
        width: 100%;
    }
}