@keyframes SquareRotation {
    from{
        transform: rotate(-15deg);
    }

    to{
        transform: rotate(345deg);
    }
}

@keyframes TriangleRotation {
    from{
        transform: rotate(0deg);
    }

    to{
        transform: rotate(360deg);
    }
}

.page {
    min-width: 1100px;
    /* мы ещё не умеем делать мобильную версию сайта, */
    /* поэтому выше установлена минимальная ширина страницы */
    max-width: 1600px;
    /* выше установили ограничение по максимальной ширине */
    margin: 0 auto;
    /* выше для экранов больше 1600px отцентрировали весь контент */
    font-family: 'Helvetica Neue', Arial, sans-serif;
}

.header {
    height: 100vh;
    min-height: 600px;
    max-height: 756px;
    position: relative;
    background-color:  #F2F2F2;
    display: flex;
    overflow: hidden;
}

.logo {
    width: 183px;
    height: 32px;
}

.logo_place_header {
    position: absolute;
    left: 64px;
    top: 30px;
    z-index: 10;
}

.header__title {
    width: 730px;
    line-height: 96px;
    font-size: 102px;
    font-weight: bold;
    align-self: center;
    margin: 0 0 0 64px;
    z-index: 2;
}

.header__subtitle {
    width: 388px;
    line-height: 25px;
    font-size: 18px;
    font-weight: normal;
    position: absolute;
    left: 64px;
    bottom: 30px;
    z-index: 10;
    margin: 0;
}

.header__link {
    text-decoration: none;
    line-height: 25px;
    font-size: 18px;
    font-weight: normal;
    color: #2F80ED;
    opacity: 1;
    transition: opacity 0.2s linear;
}

.header__link:hover{
    opacity: 0.6;
}

.header__main-illustration {
    width: 765px;
    height: 608px;
    position: absolute;
    bottom: 0;
    right: 0;
    z-index: 1;
    background-image: url(../images/two_again.png);
    background-size: cover;
}

.header__square-pic {
    width: 568px;
    height: 568px;
    position: absolute;
    right: 0;
    top: 64px;
    background-color: #2F80ED;
    transform: rotate(-15deg);
    animation: SquareRotation 20s linear infinite both;
}

.description{
    display: flex;
    justify-content: center;
    margin-top: 100px;
    margin-bottom: 100px;
}

.two-columns {
    width: 80%;
    display: flex;
    justify-content: space-between;
}

.two-columns__brief {
    width: 175px;
    margin: 0;
    text-decoration: none;
    line-height: 1.2;
    font-size: 18px;
    font-weight: normal;
    color: #2F80ED;
    opacity: 1;
    transition: opacity 0.2s linear;
}

.two-columns__brief:hover{
    opacity: 0.6;
}

.two-columns__main-text {
    width: 80%;
    min-width: 784px;
}

.two-columns__paragraph{
    line-height: 34px;
    font-size: 24px;
    font-weight: normal;
    margin: 0 0 30px 0;
}

.two-columns__paragraph:last-child{
    margin: 0;
}

.two-columns__span-accent {
    line-height: 34px;
    font-size: 24px;
    font-weight: bold;
}

 /*technics*/
.technics {
    width: 80%;
    display: flex;
    justify-content: center;
    flex-wrap: wrap;
    margin: 100px 0;
}

.section-title {
    line-height: 1.15;
    font-size: 60px;
    font-weight: bold;
    width: 60%;
    margin: 0 0 20px 0;
    text-align: center;
}

.section-subtitle {
    line-height: 34px;
    font-size: 24px;
    font-weight: normal;
    margin: 0;
    text-align: center;
    width: 60%;
}

.cards {
    width: 920px;
    display: grid;
    grid-template-columns: 1fr 1fr 1fr;
    grid-column-gap: 100px;
    grid-row-gap: 60px;
}

.cards__image {
    width: 160px;
    height: 160px;
    margin: 60px 40px 43px 40px;
    border-radius: 50%;
}

.cards__title {
    line-height: 1.15;
    font-size: 24px;
    font-weight: bold;
    margin: 43px 0 16px 0;
    text-align: center;
}

.cards__description {
    line-height: 23px;
    font-size: 18px;
    font-weight: normal;
    text-align: center;
    margin: 0;
}

/*video*/
.video {
    margin-top: 100px;
    display: flex;
    justify-content: center;
    flex-wrap: wrap;
}

.section-title {
    line-height: 1.15;
    font-size: 60px;
    font-weight: bold;
    width: 60%;
    margin: 0 0 20px 0;
    text-align: center;
}

.section-subtitle {
    line-height: 34px;
    font-size: 24px;
    font-weight: normal;
    margin: 0;
    text-align: center;
    width: 60%;
    margin: 0 0 60px 0;
}

.video__iframes {
    margin-top: 50px;
    display: flex;
    flex-wrap: wrap;
    z-index: 10;
}

.video__iframe {
    width: 515px;
    height: 316px;
    margin-right: 20px;
    border: 0;
}

.video__iframe:last-child{
    margin-right: 0;
}

/*oakley*/
.oakley{
    display: flex;
    justify-content: center;
    background-color:  #F2F2F2;
    padding-top: 160px;
    padding-bottom: 80px;
    transform: translate(0, -40px);
}

.two-columns {
    width: 80%;
    display: flex;
    justify-content: space-between;
}

.two-columns__brief {
    width: 175px;
    margin: 0;
    text-decoration: none;
    line-height: 1.2;
    font-size: 18px;
    font-weight: normal;
    color: #2F80ED;
    opacity: 1;
    transition: opacity 0.2s linear;
}

.two-columns__brief:hover{
    opacity: 0.6;
}

.two-columns__main-text {
    width: 80%;
    min-width: 784px;
}

.two-columns__paragraph{
    line-height: 34px;
    font-size: 24px;
    font-weight: normal;
    margin: 0 0 30px 0;
}

/*Feinman*/
.feinman {
    height: 890px;
    position: relative;
    background-color:  #F2F2F2;
    display: flex;
    flex-direction: column;
    align-items: center;
    background-image: url(../images/feinman.png);
    background-size: 867px 637px;
    background-position: bottom left;
    background-repeat: no-repeat;
    transform: translate(0, -40px);
}

.feinman__title {
    line-height: 1.15;
    font-size: 120px;
    font-weight: bold;
    text-align: center;
    width: 648px;
    z-index: 1;
    margin: 100px 0 0 0;
}

.feinman__subtitle {
    line-height: 51px;
    font-size: 36px;
    font-weight: normal;
    z-index: 1;
    margin: 70px 0 0 0;

}

.feinman__link {
    color: #000000;
    text-decoration: none;
    line-height: 51px;
    font-size: 36px;
    font-weight: normal;
    position: absolute;
    right: 48px;
    top: 50%;
    z-index: 1;
    opacity: 1;
    transition: opacity 0.2s linear;
}

.feinman__link:hover{
    opacity: 0.5;
}

/*Digits*/
.digits {
    display: flex;
    justify-content: center;
    flex-wrap: wrap;
    margin: 100px 0;
}

.section-title {
    line-height: 69px;
    font-size: 60px;
    font-weight: bold;
    width: 60%;
    margin: 0 0 20px 0;
    text-align: center;
}

.section-subtitle {
    line-height: 34px;
    font-size: 24px;
    font-weight: normal;
    margin: 0;
    text-align: center;
    width: 60%;
}
.table {
    display: flex;
    justify-content: space-between;
    flex-wrap: wrap;
    width: 1100px;
}

.table__cell {
    width: 250px;
    margin-top: 60px;
}

.table__heading {
    margin: 0;
    line-height: 1.15;
    font-size: 24px;
    font-weight: bold;
}

.table__text {
    margin: 20px 0 0 0;
    line-height: 1.2;
    font-size: 18px;
    font-weight: normal;

}

/*Khan*/
.khan {
    display: flex;
    justify-content: center;
    background-color:  #F2F2F2;
    padding-top: 105px;
}

.khan__container {
    width: 80%;
}

.khan__author {
    margin: 0;
    line-height: 42px;
    font-size: 30px;
    font-weight: normal;
}

.khan__title {
    margin: 0 0 50px 0;
    line-height: 1.15;
    font-size: 60px;
    font-weight: bold;
}

.khan__quote {
    margin: 50px 0 36 0;
    width: 790px;
    line-height: 34px;
    font-size: 24px;
    font-weight: normal;
}

.khan__quote-author {
    margin: 36px 0 10px 0;
    line-height: 1.15;
    font-size: 24px;
    font-weight: bold;
}

.khan__quote-author-subline {
    margin: 10px 0 68px 0;
    line-height: 1.15;
    font-size: 24px;
    font-weight: normal;
}

.khan__book-container {
    margin-top: 68px;
    display: flex;
}

.khan__book-pic {
    margin: 0 20px 0 0;
    width: 620px;
    height: 608px;
    object-fit: cover;
    object-position: 0 0;
}

.khan__buy-link {
    margin: 0 0 0 20px;
    line-height: 42px;
    font-size: 30px;
    font-weight: normal;
    color: #2F80ED;
    opacity: 1;
    transition: opacity 0.2s linear;
}

.khan__buy-link:hover{
    opacity: 0.6;
}

/*kaufman*/
.kaufman {
    display: flex;
    justify-content: center;
    flex-wrap: wrap;
    background-color: #1F1F1F;
    color: white;
    position: relative;
    overflow: hidden;
    padding-top: 90px;
    padding-bottom: 90px;
}

.kaufman__triangle {
    width: 877px;
    height: 877px;
    position: absolute;
    right: -210px;
    animation: TriangleRotation linear 20s infinite;
}

.section-title_theme_dark {
    margin-top: 90px;
    margin-bottom: 20px;
    line-height: 69px;
    font-size: 60px;
    font-weight: bold;
    z-index: 2;
}

.section-subtitle_theme_dark {
    line-height: 34px;
    font-size: 24px;
    font-weight: normal;
    z-index: 2;
}

.table_theme_dark {
    z-index: 2;
}

.table__cell_theme_dark {
    margin-top: 80px;
    width: 200px;
}

.table__heading_theme_dark {
    line-height: 1.15;
    font-size: 24px;
    font-weight: bold;
}

.table__text_theme_dark {
    line-height: 1.2;
    font-size: 18px;
    font-weight: normal;
}

/*resources*/
.resources {
    display: flex;
    justify-content: center;
    flex-wrap: wrap;
    margin-top: 100px;
    margin-bottom: 217px;
}

.section-title {line-height: 69px;
    font-size: 60px;
    font-weight: bold;
    width: 60%;
    margin: 0 0 20px 0;
    text-align: center;
}

.section-subtitle {
    line-height: 34px;
    font-size: 24px;
    font-weight: normal;
    margin: 0;
    text-align: center;
    width: 60%;
}

.resources__logo-zone {
    width: 1100px;
    margin-top: 80px;
}

.resources__logo {
    width: 270px;
    height: 38px;
}

/*footer*/
.footer {
    min-height: 350px;
    background-color: #1F1F1F;
    color: white;
    display: flex;
    justify-content: center;
}

.footer__columns {
    width: 90%;
    margin: 60px 0 40px 0;
    display: flex;
    justify-content: space-between;
}

.footer__columns_content_copyright {
    flex-basis: 711px;
    height: 100%;
    position: relative;
    line-height: 25px;
    font-size: 18px;
    font-weight: normal;
    margin: 0;
}

.logo_place_footer {
    width: 183px;
    height: 35px;
}

.footer__author {
    left: 0;
    bottom: 0;
    margin: 18px 0;
    position: absolute;
}

.footer__columns_content_info{
    margin: 0;
    width: auto;
    display: block;
}

.footer__columns_content_social{
    margin: 0;
    width: auto;
    display: block;
}

.footer__column-heading {
    margin: 0 0 20px 0;
    line-height: 30px;
    font-size: 18px;
    font-weight: bold;
}

.footer__column-links {
    display: flex;
    flex-direction: column;
    margin: 20px 0 0 0;
    padding: 18px 0 0 0;
    line-height: 30px;
    font-size: 18px;
    font-weight: normal;
    list-style-type: none;
}

.footer__button{
    text-decoration: none;
    color: white;
    opacity: 1;
    transition: opacity 0.2s linear;
}

.footer__button:hover{
    opacity: 0.6;
}