:root {
  --main-color: #555D9D;
  --light-main: #C5BFED;
  --color-link: #FEFEFE;
  --top-color: #FFFFFF;
  --accent-color: #37A18E;
  --color-todo: #D24A43;
  --footer-color: #FDFDFD;
}

.top {
  height: 750px;
  background-color: var(--main-color);
}

.sides__left-side {
  animation: move-from-left 1.5s alternate;
}

.sides__right-side {
  animation: move-from-right 1.5s alternate;
}

@keyframes move-from-left {
  0% {
    transform: translateX(-100vw);
    filter: opacity(0);
  }

  100% {
    transform: translateX(0);
  }
}

@keyframes move-from-right {
  0% {
    transform: translateX(+100vw);
    filter: opacity(0);
  }

  100% {
    transform: translateX(0);
  }
}

.sides__middle-side {
  animation: rotate 1.5s ease-in-out forwards;
}

@keyframes rotate {
  0% {
    transform: rotate(0.5turn) scale(0.5);
    filter: opacity(0);
  }

  100% {
    transform: rotate(2turn) scale(1);
  }
}

.sides__left-side {
  display: flex;
  flex-direction: column;
  justify-content: center;
  gap: 80px;
  height: 750px;
}

.title--online-school {
  font-size: 35px;
  line-height: 120%;
  letter-spacing: -0.35px;
  text-shadow: 0 4px 4px #00000040;
}

.demo-access {
  padding: 6px 30px 12px;
  width: fit-content;
  line-height: 150%;
  font-size: 35px;
  font-weight: 600;
  text-shadow: none;
  background-color: var(--color-todo);
  border-radius: 34px;
  transition: all .5s;
}

.demo-access:hover {
  text-shadow: 0 5px 5px #00000040;
  background-color: var(--accent-color);
}

.os-list__list {
  margin: 72px 0 47px;
  display: flex;
  flex-direction: column;
  gap: 50px;
}

.os-list__list-item {
  display: flex;
  justify-content: center;
  transition: all .5s;
}

.os-list__list-item:hover {
  transform: scale(110%);
}

.os-list__list-text {
  display: flex;
  justify-content: center;
  align-items: center;
  width: 650px;
  height: 120px;
  color: var(--top-color);
  text-align: center;
  font-size: 35px;
  font-weight: 600;
  letter-spacing: -1.8px;
  background-color: #80A1F6;
  border-radius: 13px;
}

.os-list__list-item:nth-child(2) .os-list__list-text {
  background-color: #51EB4E;
}

.os-list__list-item:nth-child(3) .os-list__list-text {
  background-color: #EBAC4E;
}

.os-list__list-item:nth-child(4) .os-list__list-text {
  background-color: #E2DA19;
}

.os-list__list-item:nth-child(5) .os-list__list-text {
  background-color: #F15E5E;
}

.os-list__list-item:nth-child(6) .os-list__list-text {
  background-color: #EFACFF;
}

.os-list__list-item:nth-child(7) .os-list__list-text {
  background-color: #9E9E9E;
}

.os-list__list-item:nth-child(8) .os-list__list-text {
  background-color: #00B2FF;
}

.os-list__list-img {
  margin: 0 124px;
}

.price__container {
  max-width: 1206px;
  padding: 170px 0 0;
  /*background: url(../images/backgrounds/price-bg.png) no-repeat;*/
  background:#37F7FE;
  border-radius: 13px;
}

.price__title {
  text-align: center;
  text-shadow: 0px 3px 3px #00000040;
  font-size: 46px;
  font-weight: 300;
  line-height: 150%;
  letter-spacing: -0.46px;
}

.price__subtitle {
  text-align: center;
  text-shadow: 0px 3px 3px #00000040;
  font-size: 27px;
  font-weight: 400;
  line-height: 150%;
  letter-spacing: -0.27px;
}

.price__list {
  margin-top: 60px;
  padding-bottom: 32px;
  display: grid;
  justify-content: center;
  grid-template-areas: 
    'el1 el2'
    'el3 el4'
    'el5 el5'
    'el6 el6'
	'el7 el7';
  gap: 24px 12px;
}

.price__list-item {
  display: flex;
  flex-direction: column;
  width: 420px;
  transition: all 0.5s;
}

.price__list-item:hover {
  transform: scale(105%);
}

.price__list-item:nth-child(5) {
  width: 840px;
  grid-area: el5;
}

.price__list-item:nth-child(6) {
  width: 840px;
  grid-area: el6;
}

.price__list-item:nth-child(7) {
  width: 840px;
  grid-area: el7;
}
.price__list-title {
  padding: 6px 0 4px;
  text-align: center;
  font-size: 21px;
  font-weight: 400;
  line-height: 150%;
  letter-spacing: -0.21px;
  background-color: #47DD00;
  border-radius: 13px;
}

.price__list-item:nth-child(2) .price__list-title {
  background-color: #FF8EA9;
}

.price__list-item:nth-child(3) .price__list-title {
  background-color: #74DEFF;
}

.price__list-item:nth-child(4) .price__list-title {
  background-color: #00A3FF;
}

.price__list-item:nth-child(5) .price__list-title {
  background-color: #F1F500;
}

.price__list-item:nth-child(6) .price__list-title {
  background-color: #FFA53A;
}

.price__list-item:nth-child(7) .price__list-title {
  background-color:rgba(255,255,255,1.00);
}

.price__sublist {
  margin-top: 8px;
  padding: 16px 0;
  display: flex;
  flex-direction: column;
  flex-grow: 1;
  gap: 22px;
  font-size: 14px;
  line-height: 150%;
  letter-spacing: -0.14px;
  background-color: var(--top-color);
  border-radius: 10px;
}

.price__sublist--big {
  padding: 14px 0 18px;
}

.price__sublist-item {
  margin: 0 auto;
  width: 280px;
}

.price__sublist-item p {
  text-align: center;
}

.price__sublist--big .price__sublist-item {
  width: auto;
  font-size: 21px;
  line-height: 150%;
  letter-spacing: -0.21px;
}

.promotions {
  margin-top: 40px;
}

.promotions__title {
  color: #53AF80;
  text-align: center;
  font-size: 60px;
  line-height: 150%;
  letter-spacing: -0.6px;
}

.promotions__list {
  margin-top: 36px;
  display: flex;
  justify-content: center;
  gap: 120px;
  cursor: pointer;
}

.promotions__list-item {
  position: relative;
  padding-bottom: 30px;
  display: flex;
  flex-direction: column;
  max-width: 430px;

  transition: 1s ease-in-out;
  transform-style: preserve-3d;
}

.promotions__list-item.active {
  transform: rotateY(0.5turn);
}

.promotions__list-part--1 {
  backface-visibility: hidden;
  transition: 1s ease-in-out;
  animation: pulsing 2s infinite alternate;
}

.promotions__list-part--2 {
  position: absolute;
  backface-visibility: hidden;
  transition: 1s ease-in-out;
  transform: rotateY(0.5turn);
}

.promotions__list-img {
  transition: all .4s;
  border-radius: 13px;
}

.promotions__list-item:hover .promotions__list-img {
  border-radius: 40px;
  box-shadow: 60px -16px var(--main-color);
}

.promotions__list-title {
  margin: 16px 0 36px;
  height: 62px;
  text-align: center;
  font-size: 34px;
  font-weight: 700;
  line-height: 150%;
  letter-spacing: -0.34px;
}

.promotions__list-title--small {
  font-size: 24px;
  line-height: 120%;
  letter-spacing: -0.26px;
}

.promotions__list-details {
  display: flex;
  min-height: 480px;
  align-items: center;
  padding: 22px;
  flex-grow: 1;
  background-color: #FDECEC;
  border: 2px solid #000;
  font-size: 18px;
  line-height: 150%;
  letter-spacing: -0.19px;
}

.steps-to-start {
  margin-top: 30px;
  padding-bottom: 40px;
  display: flex;
  flex-direction: column;
  align-items: center;
}

.steps-to-start__title {
  position: relative;
  text-align: center;
  font-size: 38px;
  font-weight: 500;
  line-height: 150%;
  letter-spacing: 0.76px;
  text-transform: uppercase;
  -webkit-text-stroke: 4px #FDDCDC;
}

.steps-to-start__title--inside {
  position: absolute;
  width: 100%;
  top: 0;
  left: 50%;
  transform: translateX(-50%);
  color: var(--main-color);
  -webkit-text-stroke-color: transparent;
}

.steps-to-start__img-container {
  display: flex;
  justify-content: center;
  align-items: center;
}

.steps-to-start__img {
  margin: 0 0 -12px 0;
  display: block;
  transition: all 0.5s;
}

.steps-to-start__img:hover {
  transform: scale(108%);
}

.mobile {
  display: none;
}

@media (max-width: 1440px) {
  .sides {
    justify-content: center;
  }

  .sides__left-side {
    margin-right: 30px;
  }

  .logo__text {
    font-size: 24px;
  }

  .title--online-school,
  .demo-access {
    font-size: 28px;
  }

  .top__tel {
    font-size: 24px;
  }

  .sides__middle-side {
    max-width: 36vw;
  }

  .steps-to-start__img {
    max-width: 90%;
    margin-bottom: -4px;
  }

  .steps-to-start__img-container img {
    max-width: 30%;
  }

  .os-list__list {
    align-items: center;
  }

  .os-list__list-item {
    max-width: 90%;
  }

  .os-list__list-text {
    height: 100px;
    font-size: 26px;
    font-weight: 600;
    letter-spacing: -1.4px;
  }

  .price__container {
    max-width: 90%;
    background-size: contain;
    background-position-x: center;
  }

  .price__title {
    font-size: 40px;
  }

  .price__list {
    margin: 28px auto;
    width: fit-content;
    background-color: #DDFDF7;
  }

  .promotions__list {
    gap: 50px;
  }
}

@media (max-width: 1195px) {
  .price__list {
    width: auto;
  }
}

@media (min-width: 1000px) {
  .tg-phone {
    top: 49%;
    height: fit-content;
  }

  .tg-form {
    padding: 20px;
    border-radius: 20px;
    top: 6px;
    right: 6px;
    left: 60%;
    height: fit-content;
    box-shadow: 0px 0px 9px var(--main-color);
  }
}

@media only screen and (max-width: 1000px) and (min-width: 768px) {
  .sides__right-side {
    animation: move-from-left 1.7s alternate;
  }
}

@media (max-width: 999px) {
  .top {
    height: 532px;
  }

  .sides {
    display: grid;
    grid-template-columns: 1fr 1fr;
    grid-template-rows: 0%;
  }

  .sides__middle-side {
    position: relative;
    top: 60px;
  }

  .top__social-networks {
    flex-direction: row;
  }

  .price__title {
    margin-bottom: 20px;
    padding: 0 16px;
    line-height: 120%;
  }

  .price__list {
    margin-top: 28px;
    display: flex;
    flex-direction: column;
    align-items: center;
  }

  .price__list .price__list-item {
    width: 600px;
    max-width: 98%;
  }

  .price__sublist-item {
    width: 500px;
  }

  .price__sublist-item p {
    text-align: left;
  }

  .price__sublist--big p {
    display: inline;
  }
  
  .price__sublist--big .price__sublist-item {
    width: 500px;
    font-size: inherit;
    line-height: inherit;
    letter-spacing: inherit;
  }

  .promotions__title {
    margin-bottom: 36px;
    font-size: 36px;
  }

  .promotions__list {
    margin: auto;
    max-width: 90%;
    flex-direction: column;
    align-items: center;
    gap: 20px;
  }

  .promotions__list-item {
    /* max-width: 60%; */
  }

  .promotions__list-part--2 {
    height: fit-content;
  }

  .promotions__list-img {
    max-width: 100%;
  }

  .promotions__list-title {
    margin-bottom: 20px;
    height: auto;
    font-size: 28px;
  }

  .steps-to-start__title {
    font-size: 30px;
  }

  .os-list__list-text {
    padding: 0 12px;
  }
}


@media (max-width: 768px) {
  .desktop {
    display: none;
  }

  .mobile {
    display: block;
  }

  .logo__text {
    font-size: 16px;
    line-height: 200%;
  }

  .top {
    height: auto;
  }

  .sides {
    display: flex;
    align-items: center;
  }

  .sides__left-side {
    margin-right: 0;
    justify-content: initial;
    align-items: center;
    height: fit-content;
    gap: 28px;
  }

  .sides__middle-side {
    margin-bottom: 10px;
    position: static;
    max-width: 70%;
    min-width: 300px;
  }

  .title--online-school {
    text-align: center;
    font-size: 26px;
  }

  .demo-access {
    padding: 10px 30px 12px;
    font-size: 24px;
  }

  .top__social-networks {
    margin: 28px auto;
    position: static;
    flex-direction: row;
  }

  .top__social-networks a:nth-child(2) img {
    margin-right: -4px;
  }

  .os-list__list {
    margin-top: 40px;
    gap: 50px;
  }

  .os-list__list-item {
    flex-direction: column-reverse;
    align-items: center;
    gap: 18px;
    transform: scale(90%);
    transition: transform 1s;
  }

  .os-list__list-item.active {
    transform: scale(110%);
  }

  .os-list__list-item:nth-child(2n) {
    flex-direction: column;
  }

  .os-list__list-img {
    width: 100px;
  }

  .os-list__list-text {
    width: 90%;
    line-height: 120%;
    font-size: 20px;
    height: 80px;
  }

  .price {
    background-color: #DDFDF7;
    border-radius: 30px 30px 0 0;
  }
  
  .price__container {
    padding: 40px 0 0;
    background: none!important;
  }

  .price__title {
    margin-bottom: 0;
    font-size: 28px;
  }

  .price__subtitle {
    margin-top: 8px;
    font-size: 17px;
  }

  .price__list .price__list-item {
    width: 420px;
    max-width: 98%;
  }

  .price__sublist-item {
    width: 280px;
  }

  .price__sublist--big .price__sublist-item {
    width: 280px;
    font-size: inherit;
    line-height: inherit;
    letter-spacing: inherit;
  }

  .promotions__list-item {
    /* max-width: 90%; */
  }

  .promotions__list-details {
    min-height: 420px;
  }

  .promotions__list-title {
    font-size: 22px;
  }

  .promotions__list-item:hover .promotions__list-img {
    border-radius: 40px;
    box-shadow: none;
  }

  .steps-to-start__title {
    margin-bottom: 32px;
    font-size: 26px;
    max-width: 600px;
  }

  .steps-to-start__img-container.mobile {
    display: flex;
    flex-direction: column;
  }

  .steps-to-start__img-container img {
    max-width: 85%;
  }
}

@keyframes pulsing {
  0% {
    transform: scale(95%);
  }

  100% {
    transform: scale(90%);
  }
}