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

html {
  font-size: 16px;
}

body {
  display: block grid;
  grid-template-columns: 3rem 1fr 3rem;
  row-gap: 2rem;

  /* Not necessary in a real world app. Just added it to see my last article better. In other word this is a development state only css rule that I've added. */
  margin-block-end: 2rem;
}

.main-nav {
  display: block grid;
  grid-column: 1 / -1;
  grid-template-columns: 170px 2fr 1fr;
  grid-template-rows: 1fr;
  gap: 1rem;
  padding-block: 0.5rem;
  padding-inline: 1rem;
  align-items: center;
  margin-block-end: 1rem;
  position: sticky;
  inset-inline-start: 0;
  inset-block-start: 0;
  background-color: white;
  z-index: 1;
}

.main-nav.is-pinned {
  box-shadow: 0.25rem 1rem 1rem black;
}

.main-nav__logo:focus-visible {
  outline: 0;
}

.main-nav__logo > img {
  inline-size: 100%;
}

.main-nav__navbar {
  display: block flex;
  list-style-type: none;
  flex-direction: row;
}

.main-nav__navbar__item > a {
  text-decoration: none;
  display: block;
  padding-block: 1rem;
  padding-inline: 1rem;
  color: gray;
}

.main-nav__navbar__item > a.active {
  color: green;
  border-block-end: 2px solid green;
}

.main-nav__account-control-search-help {
  display: block flex;
  justify-content: end;
}

.main-nav__account-control-search-help > button {
  background-color: transparent;
  inline-size: 2.5rem;
  block-size: 2.5rem;
  cursor: pointer;
  border-radius: 2rem;
}

.main-nav__account-control-search-help > button:hover {
  background-color: gray;
}

.main-nav__account-control-search-help > button + button {
  margin-inline-start: 0.5rem;
}

.main-nav__account-control-search-help > button:focus-visible {
  outline: 0;
}

.main-nav__account-control-search-help > button > img {
  padding-inline: 0.25rem;
  padding-block: 0.25rem;
  inline-size: 70%;
}

.main-nav__account-control-search-help > button > img[alt="User avatar"] {
  border-radius: 2rem;
  inline-size: 100%;
}

.devices {
  grid-column: 2;
}

.devices > a {
  text-decoration: none;
  border-inline: 1px solid gray;
  border-block: 1px solid gray;
  padding-inline: 1rem;
  padding-block: 0.25rem;
  border-radius: 1rem;
  color: gray;
}

.devices > a:hover {
  background-color: lightgray;
}

.devices > a + a {
  margin-inline-start: 1rem;
}

.devices > a.active {
  color: green;
  border-color: lightgray;
  background-color: lightgray;
}

.devices > a.active:hover {
  border-color: darkgray;
  background-color: darkgray;
}

.category {
  grid-column: 2;
  display: block grid;
  grid-template-columns: repeat(3, 1fr);
  row-gap: 2rem;
  grid-template-rows: auto 1fr;
}

/* #region: These two css declaration blocks are helping me to align my first and last app with the header */
.category .category__app:first-of-type {
  margin-inline-start: -1rem;
}

.category .category__app:last-of-type {
  margin-inline-end: -1rem;
}
/* #endregion */

.category__header {
  grid-column: 1 / -1;
}

.category__app {
  display: block flex;
  flex-direction: column;
  position: relative;
}

.category__app > a {
  text-decoration: none;
  color: inherit;
  padding-inline: 1rem;
  padding-block: 1rem;
}

.category__app > a:hover {
  border-radius: 1rem;
  background-color: lightgray;
}

.category__app__banner {
  inline-size: 100%;
  block-size: 250px;
  border-radius: 0.75rem;
  margin-block-end: 1rem;
}

.category__app__banner__play {
  color: white;
  background-color: #333333aa;
  text-align: center;
  inline-size: 4rem;
  line-height: 4rem;
  position: absolute;
  inset-inline-start: calc(50% - 2rem);
  inset-block-start: calc(125px - 2rem);
  z-index: 1;
  text-decoration: none;
  border-radius: 2rem;
  font-size: 2rem;
  cursor: pointer;
  z-index: 0;
}

.category__app__banner__play:hover {
  /* 14px = 7px + 7px border-block */
  line-height: calc(4rem - 14px);
  background-color: #222222aa;
  border-inline: 7px solid #444444aa;
  border-block: 7px solid #444444aa;
}

.category__app__icon {
  display: block flex;
  align-items: center;
}

.category__app__icon > img:first-child {
  flex: 0 0 20%;
  inline-size: 20%;
  border-radius: 1rem;
}

.category__app__icon__data {
  flex: 0 0 80%;
}

.category__app__name,
.category__app__category,
.category__app__rate {
  margin-inline-start: 0.5rem;
}

.category__app__category,
.category__app__rate {
  color: gray;
}

.top {
  grid-column: 2;
  display: block grid;
  row-gap: 1rem;
  grid-template-rows: auto auto 1fr;
}

.top__filter > button {
  padding-inline: 1rem;
  padding-block: 0.5rem;
  border-radius: 1rem;
  color: gray;
  background-color: transparent;
  border-inline: 1px solid gray;
  border-block: 1px solid gray;
  cursor: pointer;
}

.top__filter > button + button {
  margin-inline-start: 0.75rem;
}

.top__filter > button:hover {
  background-color: lightgray;
}

.top__filter > button.active {
  color: green;
  border-color: lightgray;
  background-color: lightgray;
}

.top__filter > button.active:hover {
  border-color: darkgray;
  background-color: darkgray;
}

.top__apps {
  display: block grid;
  grid-template: repeat(3, 1fr) / repeat(3, 33.333%);
  grid-auto-flow: column;
  overflow-x: hidden;
}

.top__apps__app {
  inline-size: 100%;
}

.top__apps__app > a {
  display: block flex;
  text-decoration: none;
  color: black;
  align-items: center;
  padding-block: 0.75rem;
  overflow-x: clip;
  padding-inline: 1.75rem;
}

.top__apps__app > a:hover {
  background-color: lightgray;
  border-radius: 1rem;
}

.top_apps__app__rank {
  padding-inline-end: 1rem;
  flex: 0 0 auto;
}

.top_apps__app__data {
  display: block grid;
  align-items: center;
  column-gap: 1rem;
  grid-template-columns: auto 1fr;
  flex: 0 0 100%;
}

.top_apps__app__data > figcaption {
  /* This css property enables us to define margin-inline-end: 1.75rem; for top_apps__app__name, top_apps__app__category, and top_apps__app__rate  */
  display: grid;
  row-gap: 0.25rem;
}

.top_apps__app__data__icon {
  border-radius: 1rem;
  inline-size: 6rem;
}

.top_apps__app__name,
.top_apps__app__category,
.top_apps__app__rate {
  overflow: hidden;
  white-space: nowrap;
  margin-inline-end: 1.75rem;
}

.top_apps__app__category,
.top_apps__app__rate {
  color: gray;
}

.viral {
  grid-column: 2;
  display: block grid;
  row-gap: 1rem;
}

.viral__header > hgroup > p {
  color: gray;
  font-size: 0.9rem;
  padding-block-start: 0.25rem;
}

.viral__apps {
  display: block flex;
  /* To hide other items that should not be shown to the user */
  overflow-x: hidden;
  margin-inline: -1rem;
}

.viral__apps > a {
  text-decoration: none;
  color: inherit;
  /* Note that you can get rid of this part but keep in mind in case that the name was too long, all siblings will have same block size */
  block-size: fit-content;
  /* To fit only 6 item when user sees the apps; 100% ÷ 6 = 16.666% */
  flex: 0 0 16.666%;
}

.viral__apps > a:hover {
  background-color: lightgray;
  border-radius: 1rem;
}

.viral__apps > a h2 {
  font-size: 1rem;
  font-weight: normal;
  padding-block-end: 0.25rem;
}

.viral__apps > a figcaption p {
  color: gray;
}

.viral__apps figure {
  display: block grid;
  grid-auto-flow: row;
  row-gap: 0.5rem;
  justify-items: center;
  grid-template-columns: 1fr;
  padding-inline: 1rem;
  padding-block: 1rem;
}

.viral__apps figure figcaption {
  inline-size: 100%;
}

.viral__apps img {
  order: -1;
  inline-size: 100%;
  border-radius: 1rem;
}

.control {
  position: relative;
}

.control__prev {
  inset-inline-start: -1.5rem;
  inset-block-end: 10rem;
}

.control__next {
  inset-inline-end: -1.5rem;
  inset-block-end: 10rem;
}

.control__prev,
.control__next {
  position: absolute;
  line-height: 3rem;
  inline-size: 3rem;
  font-size: 1.5rem;
  color: gray;
  cursor: pointer;
  border-radius: 2rem;
  background-color: white;
  box-shadow: 1px 1px 5px black, -1px -1px 5px red, -1px 1px 5px blue,
    1px -1px 5px green;
}

.control__prev:hover,
.control__next:hover {
  background-color: lightgray;
}