:root {
  --primary-color: #fff;
  --secondary-color: rgba(0, 0, 0, 0.5);
  --active-color: #b74ddc;
  --content-gap: 5rem;
  --main-gap: 2rem;
  --main-gradient: linear-gradient(135deg, #b74ddc, #586ac8);
  --aside-radius: 28px;
  --box-radius: 15px;
}

::-webkit-scrollbar {
  width: 6px;
}

::-webkit-scrollbar-track {
  background: #f1f1f1;
}

::-webkit-scrollbar-thumb {
  background: linear-gradient(136.06deg, #b74ddc 26.38%, #586ac8);
  border-radius: 5px;
  box-shadow: linear-gradient(136.06deg, #b74ddc 26.38%, #586ac8);
}

/* Common styles */

.content {
  max-width: 78.52rem;
  padding: 3.125rem 1rem 6.25rem;
  margin: 0 auto;
  font-family: "Montserrat-Regular", "sans-serif";
}

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

ul,
ol {
  list-style: none;
  margin: 0;
  padding: 0;
}

a {
  text-decoration: none;
}

/* Header */
.header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 2.5rem;
}

/* Main page */
.main--page {
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  gap: var(--main-gap);
}

@media screen and (min-width: 767px) {
  .header {
    margin-bottom: 3rem;
  }

  .main--page {
    flex-direction: row;
  }

  :root {
    --main-gap: 2.5rem;
  }
}

@media screen and (min-width: 1024px) {
  .header {
    margin-bottom: 5rem;
  }

  :root {
    --main-gap: 3.75rem;
  }
}

/* Aside */
.aside {
  max-width: 250px;
  flex-shrink: 0;
  padding: 1.5rem 1rem;
  background: linear-gradient(white, white) padding-box,
    var(--main-gradient) border-box;
  border: 2px solid transparent;
  border-radius: var(--aside-radius);
}

.list {
  color: var(--secondary-color);
}

.list-item {
  font-family: "Gropled", "sans-serif";
  font-size: 1.5rem;
  cursor: pointer;
}

.list > li {
  background: var(--main-gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.list__inner {
  display: none;
  font-family: "Inter";
  font-size: 0.875rem;
  line-height: 1.2;
}

.list__inner > li a:active,
.list__inner > li a:hover {
  color: var(--active-color);
}

.list__inner li:not(:last-child) {
  margin-bottom: 2px;
}

.list__inner > li > ul {
  display: none;
  margin: 0.5rem 0;
  padding-left: 0.625rem;
}

.list__inner > li:last-child {
  margin-bottom: 1.25rem;
}

.list__inner > li:last-child > ul {
  margin-bottom: 0;
}

.list-item.active + .list__inner {
  display: block;
}

.list__inner > li.active > ul {
  display: block;
}

@media screen and (min-width: 767px) {
  .aside {
    padding: 2rem 1.5rem;
  }

  .list-item {
    font-size: 1.875rem;
  }

  .list__inner {
    font-size: 1rem;
  }
}

@media screen and (min-width: 1024px) {
  .aside {
    padding: 2.5rem 1.625rem;
  }

  .list-item {
    font-size: 2rem;
  }

  .list__inner {
    font-size: 1.125rem;
  }
}

/* Cards */
.cards {
  flex: 1;
  padding: 1.5rem;
  padding-top: 2rem;
  border-radius: var(--box-radius);
  box-shadow: 0px 0px 50px 1px rgba(0, 0, 0, 0.25);
  background-image: url("../images/krug-bg.png");
  background-size: 40% auto;
  background-position: bottom right;
  background-repeat: no-repeat;
}

.cards > h2 {
  margin-bottom: 1rem;
  font-family: "Gropled", "sans-serif";
  font-size: 1.25rem;
  color: var(--secondary-color);
}

.cards.lessons > h2 {
  margin-bottom: 0;
  line-height: 0.9375;
}

.cards > h4 {
  font-family: "Inter";
  font-size: 1rem;
  font-weight: 400;
  color: var(--active-color);
}

.cards .wrapper {
  display: flex;
  flex-wrap: wrap;
  gap: 1.5rem 2rem;
}

.cards .card {
  flex: 1;
  background: var(--main-gradient);
  border-radius: var(--box-radius);
  font-family: "Montserrat-Bold";
  font-size: 1rem;
  line-height: 1.2;
  color: var(--primary-color);
}

.cards .card > a {
  display: block;
  padding: clamp(1.5rem, 5vw, 2.5rem);
}

.card p {
  font-family: "Montserrat-Bold";
}

@media screen and (min-width: 767px) {
  .cards {
    padding: 2rem;
    padding-top: 2.5rem;
  }

  .cards > h2 {
    margin-bottom: 1.125rem;
    font-size: 1.875rem;
  }

  .cards > h4 {
    font-size: 1.25rem;
  }

  .cards .wrapper {
    gap: 2rem 2.5rem;
  }

  .cards .card {
    font-size: 1.25rem;
  }
}

@media screen and (min-width: 1024px) {
  .cards {
    padding: 2.5rem;
    padding-top: 3rem;
  }

  .cards > h2 {
    margin-bottom: 1.25rem;
    font-size: 2rem;
  }

  .cards > h4 {
    font-size: 1.5rem;
  }

  .cards .wrapper {
    gap: 2.5rem 3rem;
  }

  .cards .card {
    font-size: 1.5rem;
  }

  .cards .card > a {
    padding: clamp(2rem, 4vw, 3.8rem);
  }
}

/* Lessons */
.video {
  width: 100%;
  margin-top: 1.5rem;
}

.video video {
  width: 100%;
  /* height: 15rem; */
}

.video__controls {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 0.5rem;
  margin-top: 1rem;
}

.video__controls button {
  display: flex;
  justify-content: center;
  align-items: center;
  width: 2.5rem;
  height: 2.5rem;
  background: var(--main-gradient);
  border: none;
  border-radius: 50%;
  cursor: pointer;
}

.video__controls a {
  display: block;
  padding: 0.5rem 2rem;
  background: var(--main-gradient);
  border-radius: var(--aside-radius);
  font-family: "Montserrat-Bold", "sans-serif";
  font-size: 0.875rem;
  color: var(--primary-color);
}

@media screen and (min-width: 767px) {
  .video {
    margin-top: 1.875rem;
  }

  /* .video video {
    height: 18rem;
  } */

  .video__controls {
    gap: 1rem;
    margin-top: 1.5rem;
  }

  .video__controls button {
    width: 3rem;
    height: 3rem;
  }

  .video__controls a {
    padding: 0.875rem 2.5rem;
    font-size: 1.125rem;
  }
}

@media screen and (min-width: 1024px) {
  .video {
    margin-top: 2.25rem;
  }

  /* .video video {
    height: 22.75rem;
  } */

  .video__controls {
    margin-top: 1.875rem;
  }

  .video__controls button {
    width: 3.625rem;
    height: 3.625rem;
  }

  .video__controls a {
    padding: 1rem 3rem;
    font-size: 1.25rem;
  }
}

/* 404 page */
.main--not-found {
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  font-size: 0.875rem;
}

.main--not-found img {
  max-width: 40vw;
  margin-bottom: 0.875rem;
}

.main--not-found > * {
  background: var(--main-gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.main--not-found h1 {
  margin-bottom: 0.5rem;
  font-family: "Montserrat-Bold", "sans-serif";
  font-size: 2rem;
  line-height: 0.8;
}

.main--not-found p {
  font-family: "Montserrat-Regular";
  letter-spacing: 0px;
}

.main--not-found a {
  margin-top: 6rem;
  border-bottom: 1px solid transparent;
  border-image: linear-gradient(90deg, #b74ddc, #586ac8);
  border-image-slice: 1;
  font-family: "Montserrat-Medium";
}

@media screen and (min-width: 767px) {
  .main--not-found {
    font-size: 1.25rem;
  }

  .main--not-found img {
    max-width: none;
    margin-bottom: 1.5rem;
  }

  .main--not-found h1 {
    margin-bottom: 0.875rem;
    font-size: 3rem;
  }

  .main--not-found a {
    margin-top: 8rem;
  }
}

@media screen and (min-width: 1024px) {
  .main--not-found {
    font-size: 1.5rem;
  }

  .main--not-found img {
    margin-bottom: 1.875rem;
  }

  .main--not-found h1 {
    margin-bottom: 1rem;
    font-size: 4rem;
  }

  .main--not-found a {
    margin-top: 9.5rem;
  }
}

/* Login */
.main--login {
  height: 100vh;
  display: flex;
  justify-content: center;
  align-items: center;
  padding: 0 1rem;
}

.main--login .logo {
  margin-bottom: 3rem;
}

.main--login .logo img {
  max-width: 70%;
  margin: 0 auto;
}

.main--login .wrapper {
  width: 100%;
  padding: 2rem 1rem 10rem;
  box-shadow: 0px 0px 50px 1px rgba(0, 0, 0, 0.25);
  background-image: url("../images/krug-bg.png"), url("../images/person.png");
  background-size: 50% auto, 22% auto;
  background-position: right bottom, left bottom;
  background-repeat: no-repeat;
  border-radius: var(--aside-radius);
}

.message-error {
  border: 1px solid;
  margin: 10px 0px;
  padding: 15px 10px 15px 50px;
  background-repeat: no-repeat;
  background-position: 10px center;
  color: black;
  background-color: #FFBABA;
  font-family: "Montserrat-Medium", "sans-serif";
}

.message-success {
  border: 1px solid;
  margin: 10px 0px;
  padding: 15px 10px 15px 50px;
  background-repeat: no-repeat;
  background-position: 10px center;
  color: white;
  background-color: #caffb4;
  font-family: "Montserrat-Medium", "sans-serif";
}

.main--page .form,
.main--login .form {
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
  max-width: 90%;
  margin: 0 auto;
}

.main--page .form-item,
.main--login .form-item {
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
}

.main--page .form-item label,
.main--login .form-item label {
  font-family: "Montserrat-Medium", "sans-serif";
  font-size: 1rem;
  color: var(--active-color);
}

.main--page .form-item input,
.main--login .form-item input {
  padding: 0.25rem 0.75rem;
  background: linear-gradient(white, white) padding-box,
    var(--main-gradient) border-box;
  border: 2px solid transparent;
  border-radius: var(--aside-radius);
}

.main--page button,
.main--login button {
  align-self: center;
  margin-top: 2rem;
  width: 100%;
  padding: 0.5rem 1rem 0.6rem;
  background: var(--main-gradient);
  border: none;
  border-radius: var(--aside-radius);
  font-family: "Montserrat-Medium";
  font-size: 1rem;
  color: var(--primary-color);
  cursor: pointer;
}

@media screen and (min-width: 767px) {
  .main--login .logo {
    margin-bottom: 4rem;
  }

  .main--login .logo img {
    max-width: 50%;
  }

  .main--login .wrapper {
    width: 50rem;
    padding: 4.875rem 0.5rem 16rem;
  }

  .main--page .form,
  .main--login .form {
    gap: 1.875rem;
    max-width: 24rem;
  }

  .main--page .form-item,
  .main--login .form-item {
    gap: 0.5rem;
  }

  .main--page .form-item label,
  .main--login .form-item label {
    font-size: 1.25rem;
  }

  .main--page .form-item input,
  .main--login .form-item input {
    padding: 0.5rem 0.875rem;
  }

  .main--page button,
  .main--login button {
    margin-top: 2.5rem;
    width: 22rem;
    padding: 0.5rem 1.5rem 0.6rem;
    font-size: 1.25rem;
  }
}

@media screen and (min-width: 1024px) {
  .main--login .logo {
    margin-bottom: 4.5rem;
  }

  .main--login .logo img {
    max-width: none;
  }

  .main--login .wrapper {
    width: 57.875rem;
    /*height: 85vh;*/
    padding: 5.25rem 1rem 2rem;
  }

  .main--page .form,
  .main--login .form {
    gap: 2.25rem;
    max-width: 31.625rem;
  }

  .main--page .form-item,
  .main--login .form-item {
    gap: 0.625rem;
  }

  .main--page .form-item label,
  .main--login .form-item label {
    font-size: 1.5rem;
  }

  .main--page .form-item input,
  .main--login .form-item input {
    padding: 0.75rem 1rem;
  }

  .main--page button,
  .main--login button {
    margin-top: 3.25rem;
    width: 26.125rem;
    padding: 0.8rem 2rem 0.9rem;
    font-size: 1.5rem;
  }
}

/* Payment */

.main--payment .wrapper {
  width: 100%;
  padding: 2rem 1rem 10rem;
  box-shadow: 0px 0px 50px 1px rgba(0, 0, 0, 0.25);
  background-image: url("../images/krug-bg.png");
  background-size: 50% auto;
  background-position: right bottom, left bottom;
  background-repeat: no-repeat;
  border-radius: var(--aside-radius);
}

.payment {
  display: flex;
  flex-direction: column;
  gap: 0.875rem;
  margin: 0 auto;
}

.payment .item {
  display: flex;
  align-items: center;
  gap: 1.875rem;
  margin: 0 auto;
  padding: 0 1rem;
  font-family: "Montserrat-Medium", "sans-serif";
  font-size: 0.875rem;
  color: var(--secondary-color);
}

.payment .item > p:first-child {
  font-size: 1rem;
  color: var(--active-color);
}

.payment a {
  width: auto;
  margin-top: 3.5rem;
  align-self: center;
  margin-top: 2rem;
  padding: 0.5rem 2rem 0.6rem;
  background: var(--main-gradient);
  border: none;
  border-radius: var(--aside-radius);
  font-family: "Montserrat-Medium";
  font-size: 1rem;
  color: var(--primary-color);
  cursor: pointer;
  text-align: center;
}

@media screen and (min-width: 767px) {
  .main--payment .wrapper {
    width: 50rem;
    padding: 4.875rem 0.5rem 16rem;
  }

  .payment {
    gap: 1rem;
    max-width: 90%;
  }

  .payment .item {
    gap: 2rem;
    padding: 0 2rem;
    font-size: 1rem;
  }

  .payment .item > p:first-child {
    font-size: 1.25rem;
  }

  .payment button {
    width: 22rem;
    margin-top: 5rem;
  }
}

@media screen and (min-width: 1024px) {
  .main--payment .wrapper {
    width: 57.875rem;
    /*height: 75vh;*/
    padding: 5.25rem 1rem 2rem;
  }

  .payment {
    gap: 1.25rem;
    max-width: 31.625rem;
  }

  .payment .item {
    gap: 2.75rem;
    margin: 0;
    padding: 0 5.25rem;
    font-size: 1.25rem;
  }

  .payment .item > p:first-child {
    font-size: 1.5rem;
  }

  .payment a {
    margin-top: 6.625rem;
    padding: 0.8rem 2rem 0.9rem;
    font-size: 1.5rem;
  }
}

/* Menu */
.menu {
  position: relative;
  display: inline-block;
}

.menu-btn {
  background-color: transparent;
  color: var(--active-color);
  padding: 0;
  border: none;
  font-size: 1.25rem;
  cursor: pointer;
}

.menu-list {
  display: none;
  position: absolute;
  right: 0;
  padding: 0.5rem;
  border-radius: 8px;
  background: var(--primary-color);
  box-shadow: 0px 0px 50px 1px rgba(0, 0, 0, 0.25);
  min-width: 12rem;
  z-index: 1;
}

.menu-list a {
  color: var(--secondary-color);
  padding: 0.5rem;
  text-decoration: none;
  display: block;
}

.menu-list a:hover,
.menu-list a:focus,
.menu-list a:active {
  color: var(--active-color);
}

.menu-list.show {
  display: block;
}