@import "root.css";

header {
    position: relative;
    display: flex;
    justify-content: center;
    background: transparent;
}

.header-content_wrapper {
    display: flex;
    flex-direction: row;
    justify-content: space-between;
    align-items: center;
    width: 1810px;
}

/* ___NAVIGATION___ */
.navigation {
    position: relative;
    display: flex;
    flex-direction: row;
    justify-content: space-between;
    z-index: 5;
}

.navigation-link {
    font-family: Exo2-Regular, sans-serif;
    font-size: 23px;
    color: var(--white-color);
    cursor: pointer;
    padding: 47px 18px 47px 18px;
    white-space: nowrap;
    text-decoration: none;
}

.navigation-link:visited {
    text-decoration: none;
}

.navigation-link:not(.active):hover {
    transition: var(--transition);
    color: var(--hover-color);
    background: rgba(255, 255, 255, 0.01);
}

.navigation-link:not(.active):not(:hover) {
    transition: var(--transition-not);
    color: var(--white-color);
}

.navigation-link.active {
    font-family: Exo2-Bold, sans-serif;
    cursor: auto;
    background: rgba(255, 255, 255, 0.05);
}

/* ___navigation-members___ */
.navigation-link-popup {
    display: flex;
    align-items: center;
}

.navigation-link-popup-text {
    margin: 0 8px 0 0;
}

.navigation-link-popup-image {
    transform: rotate(90deg) translateY(3px);
    transform-origin: center;
}

.navigation-link-popup:hover .navigation-link-popup-image-color {
    transition: var(--transition);
    fill: var(--hover-color);
}

.navigation-link-popup:not(:hover) .navigation-link-popup-image-color {
    transition: var(--transition-not);
    fill: var(--white-color);
}

.navigation-popup {
    position: absolute;
    display: flex;
    flex-direction: column;
    justify-content: flex-start;
    background: var(--white-color);
    padding: 25px 15px 25px 15px;
    visibility: hidden;
}

.navigation-popup-members {
    top: 122px;
    left: 621px;
}

.navigation-popup-archive {
    top: 122px;
    right: 0;
}

.navigation-popup:hover {
    visibility: visible;
}

.navigation-link-popup.navigation-link-popup-members:hover ~ .navigation-popup.navigation-popup-members {
    transition: var(--transition);
    visibility: visible;
}

.navigation-link-popup.navigation-link-popup-archive:hover ~ .navigation-popup.navigation-popup-archive {
    transition: var(--transition);
    visibility: visible;
}

.navigation-popup-link {
    font-family: Exo2-Regular, sans-serif;
    font-size: 23px;
    font-weight: 100;
    color: var(--dark-text-color);
    text-decoration: none;
}

.navigation-popup-link:visited {
    text-decoration: none;
}

.navigation-popup-link.active {
    cursor: default;
}

.navigation-popup-line {
    height: 1px;
    width: 100%;
    background: #9F9F9F;
    margin: 15px 0 15px 0;
}

/* ___mail___ */
.navigation-mail {
    display: flex;
    color: var(--white-color);
    text-decoration: none;
    cursor: pointer;
}

.navigation-mail:hover {
    transition: var(--transition);
    color: var(--hover-color);
}

.navigation-mail:not(:hover) {
    transition: var(--transition-not);
    color: var(--white-color);
}


/* ___mail-text___ */
.navigation-mail-text {
    font-family: Exo2-Extra-Light, sans-serif;
    font-size: 34px;
    font-weight: 100;
}


/* ___mail-image___ */
.navigation-mail:hover .navigation-mail-image-color--mobile {
    transition: var(--transition);
    fill: var(--hover-color);
}

.navigation-mail:not(:hover) .navigation-mail-image-color--mobile {
    transition: var(--transition-not);
    fill: var(--white-color);
}

/* ___language___ */
.navigation-language_wrapper {
    display: flex;
    font-family: Exo2-Medium, sans-serif;
}

.navigation-language_ru, .navigation-language_en {
    font-family: Exo2-Medium, sans-serif;
    font-size: 28px;
    color: var(--white-color);
    background: transparent;
    padding: 12px;
    border: none;
    outline: none;
    text-decoration: none;
}

.navigation-language_ru.active, .navigation-language_en.active {
    color: var(--blue-color);
    background: var(--white-color);
}

.navigation-language_ru:not(.active), .navigation-language_en:not(.active) {
    cursor: pointer;
}

.navigation-language_ru:not(.active):hover, .navigation-language_en:not(.active):hover {
    transition: var(--transition);
    color: var(--hover-color);
}

.navigation-language_ru:not(.active):not(:hover) {
    transition: var(--transition-not);
    color: var(--white-color);
}

/* ___registration-button___*/
.navigation-registration {
    font-family: Inter-Regular, sans-serif;
    font-size: 24px;
    color: var(--blue-color);
    padding: 18px 56px 18px 56px;
    border: none;
    outline: none;
    background: var(--white-color);
    cursor: pointer;
    text-decoration: none;
    margin: 0 10px 0 0;
}

.navigation-registration:visited {
    text-decoration: none;
}

.navigation-registration:not(.active):hover {
    transition: var(--transition);
    background: var(--hover-color);
}

.navigation-registration:not(.active):not(:hover) {
    transition: var(--transition-not);
    background: var(--white-color);
}

.navigation-registration.active {
    cursor: default;
}

/* ___HEADING___ */
.heading_wrapper {
    background: var(--dark-blue-color);
}

.heading_wrapper {
    position: relative;
    background-image: url(../media/images/background.jpg);
    background-size: cover;
    background-repeat: no-repeat;
    background-position: center center;
    width: 100%;
    height: 100%;
    margin: 0 0 65px 0;
}

.heading {
    display: flex;
    align-items: center;
    justify-content: center;
    background: transparent;
}

.heading-content_wrapper {
    display: flex;
    justify-content: space-between;
    max-width: 1810px;
    padding: 65px 0 65px 0;
    margin: 0 0 90px 0;
    width: 100%;
}

.heading-text_wrapper {
    margin: 0 var(--main-indent) 0 var(--main-indent);
}

/* ___title___ */
.conference-logo {
    width: 315px;
    height: auto;
    margin: 0 0 30px 0;
}

.heading-text_wrapper .conference-logo {
    transform: translateX(-19px);
}

.main-title {
    margin: 0 0 70px 0;
}

.main-title .text {
    font-family: Exo2-Extra-Light, sans-serif;
    font-size: 26px;
    color: var(--white-color);
}

.main-title .title {
    font-weight: 100;
    font-family: Exo2-Medium, sans-serif;
    font-size: 48px;
    color: var(--white-color);
}

.main-date {
    font-family: Exo2-Extra-Light, sans-serif;
    font-size: 68px;
    color: var(--white-color);
    margin: 0 0 60px 0;
}

.main-address .address {
    font-family: Exo2-Medium, sans-serif;
    font-size: 26px;
    color: var(--white-color);
}

.main-address .extra-address {
    font-family: Exo2-Extra-Light, sans-serif;
    font-size: 26px;
    color: var(--white-color);
}

/* ___logos___ */
.heading-logos_wrapper {
    display: flex;
    flex-direction: row;
    justify-content: center;
    align-items: center;
    margin: 0 var(--main-indent) 0 0;
}

.heading-logos_wrapper a:hover svg path {
    transition: var(--transition);
    fill: var(--hover-color);
}

.heading-logos_wrapper a:not(:hover) svg path {
    transition: var(--transition-not);
    fill: var(--white-color);
}

.right-logos_wrapper {
    display: flex;
    flex-direction: column;
    align-items: flex-end;
    margin: 0 0 0 63px;
}

.kfk-logo {
    margin: 0 0 92px 0;
}

.heading-red-line {
    pointer-events: none;
    user-select: none;
    position: absolute;
    bottom: 70px;
    width: 100%;
}

.heading-bottom-decoration {
    pointer-events: none;
    user-select: none;
    position: absolute;
    bottom: -2px;
    width: 100%;
}

.heading--mobile-logos_wrapper {
    display: none;
    flex-direction: row;
    justify-content: space-around;
    align-items: center;
    flex-wrap: nowrap;
    margin: 0 var(--main-indent) 62px var(--main-indent);
}

.heading--mobile-logos_wrapper a:hover svg path {
    transition: var(--transition);
    fill: var(--hover-color);
}

.heading--mobile-logos_wrapper a:not(:hover) svg path {
    transition: var(--transition-not);
    fill: var(--white-color);
}

/* ___mobile___ */
.navigation-mail-image--mobile {
    display: none;
    width: 44px;
    height: 44px;
}

.header-content_wrapper--mobile {
    display: none;
    flex-direction: row;
    justify-content: space-between;
    align-items: center;
    width: 100%;
    height: 122px;
    margin: 0 var(--main-indent) 0 var(--main-indent);
}

/* ___burger___ */
.navigation--mobile-burger {
    position: relative;
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    width: 75px;
    height: 40%;
    cursor: pointer;
}

.navigation--mobile-burger div {
    width: 100%;
    height: 6px;
    background: var(--white-color);
}

.navigation--mobile-burger:hover div {
    transition: var(--transition);
    background: var(--hover-color);
}

.navigation--mobile-burger:not(:hover) div {
    transition: var(--transition-not);
    background: var(--white-color);
}

/* ___mobile-right-wrapper___ */
.navigation--mobile-right_wrapper {
    display: flex;
    flex-direction: row;
    align-self: center;
}

/* ___mobile-mail___ */
.navigation--mobile-mail-image--mobile {
    display: none;
}

.navigation--mobile-mail {
    display: flex;
    color: var(--white-color);
    text-decoration: none;
    cursor: pointer;
    margin: 0 50px 0 50px;
}

.navigation--mobile-mail:hover {
    transition: var(--transition);
    color: var(--hover-color);
}

.navigation--mobile-mail:not(:hover) {
    transition: var(--transition-not);
    color: var(--white-color);
}

.navigation--mobile-mail-text {
    font-family: Exo2-Extra-Light, sans-serif;
    font-size: 34px;
    font-weight: 100;
}

/* ___mobile-registration___ */
.navigation--mobile-registration {
    font-family: Inter-Regular, sans-serif;
    font-size: 24px;
    color: var(--blue-color);
    padding: 18px 56px 18px 56px;
    border: none;
    outline: none;
    background: var(--white-color);
    cursor: pointer;
    text-decoration: none;
}

.navigation--mobile-registration:visited {
    text-decoration: none;
}

.navigation--mobile-registration:not(.active):hover {
    transition: var(--transition);
    background: var(--hover-color);
}

.navigation--mobile-registration:not(.active):not(:hover) {
    transition: var(--transition-not);
    background: var(--white-color);
}

.navigation--mobile-registration.active {
    cursor: default;
}

.navigation--mobile-registration-w440 {
    display: none;
    font-family: Inter-Regular, sans-serif;
    font-size: 24px;
    color: var(--blue-color);
    padding: 18px 56px 18px 56px;
    border: none;
    outline: none;
    background: var(--white-color);
    cursor: pointer;
    text-decoration: none;
}

.navigation--mobile-registration-w440:visited {
    text-decoration: none;
}

.navigation--mobile-registration-w440:not(.active):hover {
    transition: var(--transition);
    background: var(--hover-color);
}

.navigation--mobile-registration-w440:not(.active):not(:hover) {
    transition: var(--transition-not);
    background: var(--white-color);
}

.navigation--mobile-registration-w440.active {
    cursor: default;
}

/* ___navigation-mobile___ */
.navigation--mobile_wrapper {
    display: none;
    position: fixed;
    flex-direction: column;
    justify-content: flex-start;
    top: 0;
    left: 0;
    background: rgba(0, 0, 0, 0.7);
    backdrop-filter: blur(35px);
    -webkit-backdrop-filter: blur(35px);
    transform: translateZ(0);
    width: 100%;
    z-index: 6;
    padding: 122px 0 0 0;
    overflow-y: auto;
}

@supports not (backdrop-filter: blur()) {
    .navigation--mobile_wrapper {
        background: #020B13;
    }
}

.navigation--mobile_wrapper.active {
    display: flex;
    height: 100%;
}

/* ___navigation-mobile-heading___*/
.navigation--mobile-heading {
    display: flex;
    flex-direction: row;
    align-items: center;
    justify-content: space-between;
    box-shadow: 0 50px 75px 0 rgba(0, 0, 0, 20%);
}

.navigation--mobile-heading-language_wrapper {
    display: flex;
    flex-direction: row;
    align-items: center;
    margin: 35px 0 35px 35px;
}

.navigation--mobile-heading-language-line {
    width: 1px;
    height: 40px;
    background: var(--white-color);
    margin: 0 12px 0 12px;
}

.navigation--mobile-heading-close_wrapper {
    margin: 25px 25px 25px 0;
    padding: 20px;
    cursor: pointer;
}

.navigation--mobile-heading-close {
    position: relative;
    width: 30px;
    height: 30px;
}

.navigation--mobile-close-line {
    position: absolute;
    top: 50%;
    width: 100%;
    height: 2px;
    border-radius: 10px;
    background: var(--white-color);
}

.navigation--mobile-heading-close_wrapper:hover .navigation--mobile-close-line {
    transition: var(--transition);
    background: var(--hover-color);
}

.navigation--mobile-heading-close_wrapper:not(:hover) .navigation--mobile-close-line {
    transition: var(--transition-not);
    background: var(--white-color);
}

.navigation--mobile-close-line:nth-child(1) {
    transform: rotate(45deg);
}

.navigation--mobile-close-line:nth-child(2) {
    transform: rotate(-45deg);
}

/* ___navigation-mobile___ */
.navigation--mobile {
    display: flex;
    flex-direction: column;
    width: 100%;
    overflow: auto;
}

/* ___navigation-mobile-link___ */
.navigation--mobile-link_wrapper {
    display: flex;
    flex-direction: row;
    align-items: center;
}

.navigation--mobile-link-image {
    width: 20px;
    height: auto;
    padding: 32px;
}

.navigation--mobile-link-image-members {
    width: 20px;
    height: 20px;
    padding: 32px;
}

.navigation--mobile-link {
    position: relative;
    display: block;
    font-family: Exo2-Regular, sans-serif;
    font-size: 15px;
    color: var(--white-color);
    cursor: pointer;
    white-space: nowrap;
    text-decoration: none;
    width: calc(100% - 30px);
    padding: 32px 0 32px 30px;
}

.navigation--mobile-link:visited {
    text-decoration: none;
}

.navigation--mobile-link:not(.active):hover {
    transition: var(--transition);
    color: var(--hover-color);
    background: rgba(255, 255, 255, 0.01);
}

.navigation--mobile-link:not(.active):not(:hover) {
    transition: var(--transition-not);
    color: var(--white-color);
}

.navigation--mobile-link.active {
    font-family: Exo2-Bold, sans-serif;
    cursor: auto;
    background: var(--dark-blue-color);
}

.navigation--mobile-link-line {
    display: none;
    visibility: hidden;
    position: absolute;
    height: 100%;
    width: 1px;
    left: 0;
    top: 0;
    background: var(--white-color);
}

.navigation--mobile-link.active .navigation--mobile-link-line {
    display: block;
    visibility: visible;
}
/* ___navigation-mobile-popup___ */
.navigation--mobile-link-popup {
    display: flex;
    align-items: center;
}

.navigation--mobile-link-text {
    margin: 0 8px 0 0;
}

.navigation--mobile-link-members-image {
    transform: rotate(90deg) translateY(3px) translateX(3px);
    transform-origin: center;
}

.navigation--mobile-link-members:hover .navigation-link-popup-image-color {
    transition: var(--transition);
    fill: var(--hover-color);
}

.navigation--mobile-link-members:not(:hover) .navigation-link-popup-image-color {
    transition: var(--transition-not);
    fill: var(--white-color);
}

.navigation--mobile-popup {
    display: none;
    flex-direction: column;
    justify-content: flex-start;
    background: rgb(255, 255, 255, 0.01);
    padding: 35px 25px 35px 25px;
    top: 122px;
    left: 621px;
}

@supports not (backdrop-filter: blur()) {
    .navigation--mobile-popup {
        background: var(--white-color);
    }
}

.navigation--mobile-popup.active {
    display: flex;
}

.navigation--mobile-popup-link {
    font-family: Exo2-Regular, sans-serif;
    font-size: 15px;
    font-weight: 100;
    color: var(--white-color);
    text-decoration: none;
}

@supports not (backdrop-filter: blur()) {
    .navigation--mobile-popup-link {
        color: var(--dark-text-color);
    }
}

.navigation--mobile-popup-link:visited {
    text-decoration: none;
}

.navigation--mobile-popup-link.active {
    cursor: default;
}

.navigation--mobile-popup-line {
    height: 1px;
    width: 100%;
    background: #232323;
    margin: 20px 0 20px 0;
}

@supports not (backdrop-filter: blur()) {
    .navigation--mobile-popup-line {
        background: #9F9F9F;
    }
}

.navigation--mobile-mail-menu_wrapper {
    display: flex;
    flex-direction: row;
    align-items: center;
    padding: 32px;
    box-shadow: 0 -50px 75px 0 rgb(0, 0, 0, 20%);
    cursor: pointer;
    text-decoration: none;
}

.navigation--mobile-mail-menu-image {
    width: 20px;
    height: auto;
}

.navigation--mobile-mail-menu-text {
    font-family: Exo2-Light, sans-serif;
    font-size: 20px;
    font-weight: 100;
    color: var(--white-color);
    margin: 0 0 0 15px;
}

.navigation--mobile-mail-menu_wrapper:hover .navigation--mobile-mail-menu-text {
    transition: var(--transition);
    color: var(--hover-color);
}

.navigation--mobile-mail-menu_wrapper:not(:hover) .navigation--mobile-mail-menu-text {
    transition: var(--transition-not);
    color: var(--white-color);
}

/* @media */
@media all and (min-width: 2560px) {
    .heading-bottom-decoration {
        height: 23%;
        bottom: -3px;
    }
}

@media all and (min-width: 3840px) {
    .heading-red-line {
        transform: scaleY(75%);
    }
}

@media all and (min-width: 5000px) {
    .heading-red-line {
        transform: scaleY(50%);
    }
}

@media all and (max-width: 1810px) {
    .navigation-mail {
        flex-grow: 0.35;
        align-self: center;
        justify-content: flex-end;
        margin: 0 15px 0 0;
    }

    .navigation-mail-image--mobile {
        display: block;
    }

    .navigation-mail-text {
        display: none;
    }
}

@media all and (max-width: 1610px) {
    .heading_wrapper {
        margin: 0 0 54px 0;
    }

    .heading-content_wrapper {
        margin: 0 0 63px 0;
    }

    .navigation-link {
        font-size: 19px;
        padding: 39px 15px 39px 15px;
    }

    .navigation-popup-members {
        top: 98px;
        left: 515px;
    }

    .navigation-popup-archive {
        top: 98px;
    }

    .navigation-popup .navigation-popup-link {
        font-size: 19px;
    }

    .navigation-mail-image--mobile {
        display: none;
    }

    .navigation-mail-text {
        display: block;
        font-size: 28px;
    }

    .navigation-language_wrapper a {
        font-size: 23px;
        padding: 10px;
    }

    .navigation-registration {
        font-size: 20px;
        padding: 15px 47px 15px 47px;
    }

    .conference-logo {
        width: 280px;
        margin: 0 0 23px 0;
    }

    .main-title {
        margin: 0 0 20px 0;
    }

    .main-title .title {
        font-size: 40px;
    }

    .main-title .text {
        font-size: 22px;
    }

    .main-date {
        font-size: 57px;
        margin: 0 0 35px 0;
    }

    .main-address .address, .main-address .extra-address {
        font-size: 22px;
    }

    .heading--mobile-logos_wrapper {
        display: none;
    }

    .heading--mobile-logos_wrapper a {
        margin: 0 var(--main-indent) 0 var(--main-indent);
    }

    .right-logos_wrapper {
        margin: 0 0 0 53px;
    }

    .sechenov-logo {
        width: 210px;
        height: auto;
    }

    .kfk-logo {
        width: 230px;
        height: auto;
        margin: 0 0 77px 0;
    }

    .mephi-logo {
        width: 230px;
        height: auto;
    }

    .heading-bottom-decoration {
        bottom: -2px;
    }

    .heading-red-line {
        bottom: 50px;
    }

    .heading-bottom-decoration {
        bottom: -1px;
        right: 2.5vw;
        transform: scale(105%);
    }
}

@media all and (max-width: 1490px) {
    .navigation-mail-image--mobile {
        display: block;
        width: 37px;
        height: 37px;
    }

    .navigation-mail-text {
        display: none
    }

}

@media all and (max-width: 1450px) {
    .heading_wrapper {
        margin: 0 0 49px 0;
    }

    .navigation-link {
        font-size: 17px;
        padding: 35px 13px 35px 13px;
    }

    .navigation-popup-members {
        top: 90px;
        left: 458px;
    }

    .navigation-popup-archive {
        top: 90px;
    }

    .navigation-popup .navigation-popup-link {
        font-size: 17px;
    }

    .navigation-mail-image--mobile {
        display: none;
    }

    .navigation-mail-image {
        width: 26px;
        margin: 0 10px 0 0;
    }

    .navigation-mail-text {
        display: block;
        font-size: 25px;
    }

    .heading-content_wrapper {
        margin: 0 0 57px 0;
    }

    .conference-logo {
        width: 245px;
        margin: 0 0 18px 0;
    }

    .main-title .text {
        font-size: 19px;
    }

    .main-title .title {
        font-size: 36px;
    }

    .main-date {
        font-size: 51px;
        margin: 0 0 31px 0;
    }

    .main-address .address, .main-address .extra-address {
        font-size: 19px;
    }

    .right-logos_wrapper {
        margin: 0 0 0 47px;
    }

    .sechenov-logo {
        width: 189px;
        height: auto;
    }

    .kfk-logo {
        width: 207px;
        height: auto;
    }

    .mephi-logo {
        width: 207px;
        height: auto;
    }
}

@media all and (max-width: 1380px) {
    .navigation-mail-image--mobile {
        display: block;
    }

    .navigation-mail-text {display: none}
}

@media all and (max-width: 1240px) {
    .heading_wrapper {
        margin: 0 0 38px;
    }

    .heading-content_wrapper {
        margin:  0 0 35px 0;
    }

    .navigation-link {
        font-size: 15px;
        padding: 30px 12px 30px 12px;
    }

    .navigation-popup-members {
        top: 79px;
        left: 408px;
    }

    .navigation-popup-archive {
        top: 79px;
    }

    .navigation-mail-image--mobile {
        display: none;
    }

    .navigation-mail-text {
        display: block;
        font-size: 22px;
    }

    .navigation-language_wrapper a {
        font-size: 18px;
        padding: 8px;
    }

    .navigation-registration {
        font-size: 15px;
        padding: 12px 36px 12px 36px;
    }

    .conference-logo {
        width: 216px;
        margin: 0 0 12px 0;
    }

    .heading-text_wrapper .conference-logo {
        transform: translateX(-14px);
    }

    .main-title .text {
        font-size: 17px;
    }

    .main-title .title {
        font-size: 31px;
        margin: 0 10px 0 0;
    }

    .main-date {
        font-size: 44px;
        margin: 0 0 39px 0;
    }

    .main-address .address, .main-address {
        font-size: 17px;
    }

    .sechenov-logo {
        width: 136px;
        height: auto;
    }

    .kfk-logo {
        width: 149px;
        height: auto;
        margin: 0 0 60px 0;
    }

    .mephi-logo {
        width: 149px;
        height: auto;
    }

    .heading-red-line {
        bottom: 40px;
    }
}

@media all and (max-width: 1200px) {
    .navigation-mail {
        margin: 0;
    }

    .navigation-mail-image--mobile {
        display: block;
        width: 24px;
        height: 24px;
        margin: 0 5px 0 5px;
    }

    .navigation-mail-text {
        display: none;
    }
}

@media all and (max-width: 1100px) {
    .navigation-registration {
        padding: 12px 19px 12px 19px;
    }

    .navigation-link {
        padding: 30px 10px 30px 10px;
    }
}

@media all and (max-width: 1030px) {
    .heading_wrapper {
        margin: 0 0 34px 0;
    }

    .heading-content_wrapper {
        flex-direction: column;
        align-items: center;
        padding: 0 0 65px 0;
        margin: 0 0 30px 0;
    }

    .header-content_wrapper {
        display: none;
        flex-direction: column;
        justify-content: center;
    }

    .header-content_wrapper--mobile {
        display: flex;
        height: auto;
        margin: 35px;
    }

    .navigation-mail-image {
        display: none;
    }

    .navigation--mobile_wrapper {
        height: 100vh;
        padding: 0;
    }

    .navigation--mobile-burger_wrapper {
        height: 30px;
        cursor: pointer;
    }

    .navigation--mobile-burger {
        width: 40px;
        height: 100%;
    }

    .navigation--mobile-burger div {
        height: 3px;
    }

    .navigation--mobile-burger_wrapper:hover .navigation--mobile-burger div {
        transition: var(--transition);
        background: var(--hover-color);
    }

    .navigation--mobile-burger_wrapper:not(:hover) .navigation--mobile-burger div {
        transition: var(--transition-not);
        background: var(--white-color);
    }

    .navigation--mobile-mail-text {
        display: none;
    }

    .navigation--mobile-registration {
        display: flex;
        align-items: center;
        font-size: 17px;
        padding: 14px 38px 14px 38px;
    }

    .navigation--mobile-link-members-image {
        width: 12px;
    }

    .heading-text_wrapper {
        display: flex;
        flex-direction: column;
        align-items: center;
        margin: 0 0 50px 0;
    }

    .conference-logo {
        width: 200px;
    }

    .heading-text_wrapper .conference-logo {
        transform: none;
    }

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

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

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

    .heading-logos_wrapper {
        display: none;
    }

    .heading--mobile-logos_wrapper {
        display: flex;
        margin: 0 var(--main-indent) 0 var(--main-indent);
        width: 90%;
    }

    .heading--mobile-logos_wrapper a {
        margin: 0;
    }

    .sechenov-logo {
        width: 160px;
        height: auto;
    }

    .kfk-logo {
        width: 180px;
        height: auto;
        margin: 0;
    }

    .mephi-logo {
        width: 180px;
        height: auto;
    }

    .heading-red-line {
        bottom: 30px;
    }
}

@media all and (max-width: 1070px) {
    .navigation-mail-image {
        display: none;
    }
}

@media all and (max-width: 840px) {
    .heading_wrapper {
        margin: 0 0 28px;
    }

    .navigation--mobile-mail-text.w840-hidden {
        display: none;
    }
}

@media all and (max-width: 799px) {
    .heading-content_wrapper {
        padding: 10px 0 25px;
    }

    .heading--mobile-logos_wrapper a {
        margin: 15px;
    }

    .conference-logo {
        width: 200px;
    }


    .sechenov-logo {
        width: 130px;
        height: auto;
    }

    .kfk-logo {
        width: 150px;
        height: auto;
    }

    .mephi-logo {
        width: 150px;
        height: auto;
    }
}

@media all and (max-width: 600px) {
    .heading--mobile-logos_wrapper a {
        margin: 0 10px 0 10px;
    }

    .sechenov-logo {
        width: 110px;
        height: auto;
        margin: 0;
    }

    .kfk-logo {
        width: 130px;
        height: auto;
        margin: 0;
    }

    .mephi-logo {
        width: 130px;
        height: auto;
        margin: 0;
    }

    .heading-red-line {
        bottom: 24px;
    }
}

@media all and (max-width: 505px) {
    .heading_wrapper {
        margin: 0 0 32px 0;
    }

    .heading-text_wrapper {
        margin: 0 var(--main-indent) 30px var(--main-indent);
    }


    .conference-logo {
        width: 180px;
    }

    .main-title {
        margin: 0 10px 10px 10px;
    }

    .main-title .title {
        font-size: 28px;
    }

    .main-date {
        font-size: 38px;
        margin: 0 10px 40px 10px;
    }

    .main-address .address, .main-address .extra-address {
        font-size: 17px;
    }


    .heading--mobile-logos_wrapper a {
        margin: 0 7px 0 7px;
    }

    .sechenov-logo {
        width: 85px;
        height: auto;
        margin: 0;
    }

    .kfk-logo {
        width: 95px;
        height: auto;
        margin: 0;
    }

    .mephi-logo {
        width: 95px;
        height: auto;
        margin: 0;
    }

    .heading-red-line {
        display: none;
    }
}

@media all and (max-width: 440px) {
    .main-title .title {
        font-size: 25px;
    }

    .main-date {
        font-size: 34px;
    }

    .main-address .address, .main-address .extra-address {
        font-size: 16px;
    }

    .navigation--mobile-burger {
        height: 30px;
    }

    .navigation--mobile-mail {
        margin: 0;
    }

    .heading-text_wrapper {
        margin: 0 0 15px 0;
    }

    .conference-logo {
        margin: 0 0 8px 0;
    }

    .heading-red-line {
        display: none;
    }
}

@media all and (max-width: 350px) {
    .main-title {
        margin: 0 0 10px 0;
    }

    .main-title .title {
        margin: 0;
    }

    .main-date {
        margin: 0 0 40px 0;
    }

    .heading--mobile-logos_wrapper {
        margin: 0;
        width: auto;
    }
}


.lang-item {
    display: flex;
}

.lang-item a {
    font-family: Exo2-Medium, sans-serif;
    font-size: 28px;
    color: var(--white-color);
    background: transparent;
    padding: 16px;
    border: none;
    outline: none;
    text-decoration: none;
}

.current-lang {
    background: var(--white-color);
}

.current-lang a {
    color: var(--blue-color);
}

@media all and (max-width: 1610px) {
    .lang-item a {
        font-size: 23px;
        padding: 12px;
    }
}

@media all and (max-width: 1240px) {
    .lang-item a {
        font-size: 20px;
        padding: 8px;
    }
}

@media all and (max-width: 1024px) {
    .lang-item a {
        font-size: 18px;
    }
}

.navigation--mobile-heading-language_wrapper .lang-item {
    display: flex;
    align-items: center;
}

.navigation--mobile-heading-language_wrapper .lang-item a{
    background: transparent;
    border: none;
    outline: none;
    font-family: Exo2-Light, sans-serif;
    font-size: 24px;
    font-weight: 100;
    color: var(--white-color);
    text-decoration: none;
}

.navigation--mobile-heading-language_wrapper .lang-item:first-child::after {
    content: '';
    width: 1px;
    height: 40px;
    background: var(--white-color);
    margin: 0 12px 0 12px;
}

.navigation--mobile-heading-language_wrapper .current-lang {
    background: transparent;
}

.navigation--mobile-heading-language_wrapper .current-lang a {
    font-family: Exo2-Bold, sans-serif;
    font-size: 24px;
    font-weight: 100;
    color: var(--white-color);
}