@media only screen and (min-width: 961px) {
    .mobile_header {
        display: none;
    }
}

@media only screen and (max-width: 960px) {
    :root {
        --mobile-nav-height: 60px;
        --mobile-nav-z-index: 10;
        --mobile-nav-logo-brief-text-width: 191px;
        --mobile-nav-burger-menu-width: 80px;
        --mobile-nav-contact-form-max-width: 440px;
        --mobile-nav-contact-form-padding: var(--page-block-vertical-padding) calc(2 * var(--page-block-vertical-padding)) var(--page-block-vertical-padding) 30px;
        --mobile-nav-burger-menu-position: 0;
        --mobile-nav-burger-transition: all 800ms cubic-bezier(0.8, 0, 0.33, 1);
    }

    main {
        flex-direction: column;
        justify-content: start;
    }

    body {
        flex-direction: column;
    }

    .mobile_header {
        background-color: var(--background-color);
        z-index: var(--mobile-nav-z-index);
        position: sticky;
        top: 0;
    }

    .mobile_header_top {
        background-color: var(--background-color);
        height: var(--mobile-nav-height);
        border-bottom: var(--nav-border);
        justify-content: space-between;
        align-items: center;
        flex-direction: row;
        display: flex;
        width: 100%;
    }

    .mobile_header_top > .logo__container {
        padding: 10px var(--page-vertical-padding);
        gap: var(--page-block-vertical-padding);
        flex-direction: row;
        align-items: center;
    }

    .mobile_header_top > .logo__container > .header__brief_text {
        max-width: var(--mobile-nav-logo-brief-text-width);
    }

    .mobile_header_top > .header__form__container {
        justify-content: end;
        align-items: center;
        flex-direction: row;
        display: flex;
        height: 100%;
    }

    .mobile_header_top > .header__form__container > .header__menu__container {
        width: var(--mobile-nav-burger-menu-width);
        border-inline-start: var(--nav-border);
        justify-content: center;
        align-items: center;
        flex-direction: row;
        cursor: pointer;
        display: flex;
        height: 100%;
    }

    .mobile_header_top > .header__form__container > .header__contact__container {
        max-width: var(--mobile-nav-contact-form-max-width);
        padding: var(--mobile-nav-contact-form-padding);
        gap: var(--page-block-vertical-padding);
        background-color: var(--accient-color);
        height: var(--mobile-nav-height);
        justify-content: space-between;
        box-sizing: border-box;
        flex-direction: row;
        align-items: center;
        cursor: pointer;
        display: flex;
    }

    .mobile_header_top > .header__form__container > .header__contact__container > .contact__form__title {
        line-height: var(--sub-header-text-line-height);
        font-weight: var(--sub-header-text-font-weight);
        font-size: var(--sub-header-text-font-size);
        color: var(--accient-block-text-color);
        letter-spacing: var(--letter-spacing);
        text-transform: uppercase;
        white-space: nowrap;
        margin: 0;
    }

    .mobile_header_top > .header__form__container > .header__contact__container > .contact__form__arrow {
        animation: arrowPulse 2s ease-in-out infinite;
        margin-bottom: 4px;
    }

    @keyframes arrowPulse {
        0% {
            opacity: 0.5;
            transform: translateX(0);
        }
        50% {
            opacity: 1;
            transform: translateX(5px);
        }
        100% {
            opacity: 0.5;
            transform: translateX(0);
        }
    }

    .mobile_header_form_top {
        display: none;
    }

    .burger_menu_overlay {
        background-color: var(--form-popup-overlay-background);
        bottom: var(--mobile-nav-burger-menu-position);
        right: var(--mobile-nav-burger-menu-position);
        left: var(--mobile-nav-burger-menu-position);
        top: var(--mobile-nav-height);
        align-items: center;
        position: fixed;
        display: none;
        height: 100%;
        width: 100%;
        margin: 0;
    }

    .burger_menu_overlay.show {
        display: flex;
    }

    .burger_menu {
        height: calc(100% - var(--mobile-nav-height) - 1px);
        transition: var(--mobile-nav-burger-transition);
        top: calc(var(--mobile-nav-height) + 1px);
        background-color: var(--background-color);
        border-inline-end: var(--nav-border);
        transform: translateX(-100%);
        flex-direction: column;
        box-sizing: border-box;
        justify-content: start;
        align-items: center;
        width: calc(50%);
        position: fixed;
        display: flex;
        z-index: -1;
        opacity: 0;
        left: 0;
        padding: var(--page-block-vertical-padding) var(--page-vertical-padding) 0;
    }

    .burger_menu.show {
        z-index: var(--mobile-nav-z-index);
        transform: translateX(0);
        opacity: 1;
    }

    .burger_menu__title {
        padding: var(--page-block-vertical-padding) 0;
        line-height: var(--header-text-line-height);
        font-weight: var(--header-text-font-weight);
        font-size: var(--header-text-font-size);
        letter-spacing: var(--letter-spacing);
        color: var(--text-main-color);
        text-transform: uppercase;
        box-sizing: border-box;
        width: 100%;
        margin: 0;
    }

    .burger_menu__project_types {
        padding: var(--page-block-vertical-padding) 0;
        border-bottom: var(--nav-border);
        border-top: var(--nav-border);
        justify-content: start;
        box-sizing: border-box;
        align-items: center;
        flex-direction: row;
        display: flex;
        width: 100%;
    }

    .burger_menu__project_type {
        padding: var(--nav-projects-container-type-padding);
        font-weight: var(--sub-header-text-font-weight);
        line-height: var(--sub-header-text-line-height);
        font-size: var(--sub-header-text-font-size);
        letter-spacing: var(--letter-spacing);
        border-right: var(--nav-border);
        text-transform: uppercase;
        cursor: pointer;
    }

    .burger_menu__project_type.selected, .burger_menu__project_type:hover {
        text-decoration: underline;
    }

    .burger_menu__project_type:first-child {
        padding-inline-start: 0;
    }

    .burger_menu__project_type:last-child {
        padding-inline-end: 0;
        border-right: none;
    }

    .burger_menu__projects_scroll_container {
        padding: var(--page-block-vertical-padding) 0 var(--page-block-vertical-padding) 15px;
        gap: var(--nav-projects-container-gap);
        flex-direction: column;
        justify-content: start;
        box-sizing: border-box;
        align-items: start;
        overflow: scroll;
        display: flex;
        width: 100%;
    }

    .burger_menu__projects_scroll_container::-webkit-scrollbar {
        height: 0;
        width: 0;
    }

    .burger_menu__project_info {
        gap: var(--nav-project-container-gap);
        transition: var(--nav-transition);
        justify-content: space-between;
        flex-direction: row;
        align-items: start;
        display: flex;
        width: 100%;
    }

    .burger_menu__project_shortname {
        font-weight: var(--usual-text-font-weight);
        line-height: var(--usual-text-line-height);
        font-size: var(--usual-text-font-size);
        letter-spacing: var(--letter-spacing);
        color: var(--text-main-color);
        text-transform: uppercase;
        text-decoration: none;
        cursor: pointer;
    }

    .burger_menu__project_shortname.selected,
    .burger_menu__project_shortname:hover  {
        text-decoration: underline;
    }

    .burger_menu__project_3d_label {
        font-weight: var(--header-text-font-weight);
        line-height: var(--usual-text-line-height);
        font-size: var(--usual-text-font-size);
        letter-spacing: var(--letter-spacing);
        color: var(--text-main-color);
        text-transform: uppercase;
        text-decoration: none;
    }

    .burger_menu__about_container {
        background-color: var(--background-color);
        padding: var(--footer-padding);
        justify-content: space-between;
        border-top: var(--nav-border);
        box-sizing: border-box;
        align-items: center;
        flex-direction: row;
        position: absolute;
        display: flex;
        width: 100%;
        bottom: 0;
    }

    .burger_menu__about_container > .burger_menu__about__title {
        line-height: var(--header-text-line-height);
        font-weight: var(--header-text-font-weight);
        font-size: var(--header-text-font-size);
        letter-spacing: var(--letter-spacing);
        transition: var(--nav-transition);
        color: var(--text-main-color);
        text-transform: uppercase;
        text-decoration: none;
        cursor: pointer;
    }

    .burger_menu__about_container > .burger_menu__about__title:hover {
        text-decoration: underline;
    }

    .burger_menu__about_container > .burger_menu__about__icon {
        transition: var(--nav-transition);
        cursor: pointer;
    }

    .burger_menu__about_container > .burger_menu__about__icon:hover {
        scale: var(--nav-about-container-text-scale);
    }
}

@media only screen and (max-width: 760px) {
    :root {
        --mobile-nav-contact-form-padding: var(--page-block-vertical-padding) var(--page-block-vertical-padding) var(--page-block-vertical-padding);
    }
}

@media only screen and (max-width: 680px) {
    :root {
        --nav-about-container-top-offset: calc(61px + 56px);
    }

    .mobile_header_top > .header__form__container > .header__contact__container {
        display: none;
    }

    .mobile_header_form_top {
        background-color: var(--accient-color);
        padding: var(--page-vertical-padding);
        justify-content: space-between;
        flex-direction: row;
        cursor: pointer;
        display: flex;
    }

    .mobile_header_form_top > .mobile_header_form_top__title {
        line-height: var(--header-text-line-height);
        font-weight: var(--header-text-font-weight);
        font-size: var(--header-text-font-size);
        color: var(--accient-block-text-color);
        letter-spacing: var(--letter-spacing);
        text-transform: uppercase;
        margin: 0;
    }

    .mobile_header_form_top > .contact__form__arrow {
        animation: arrowPulse 2s ease-in-out infinite;
    }

    .burger_menu_overlay {
        top: var(--nav-about-container-top-offset);
    }

    .burger_menu {
        height: calc(100% - var(--nav-about-container-top-offset));
        top: var(--nav-about-container-top-offset);
    }
}

@media only screen and (max-width: 415px) {
    :root {
        --nav-about-container-top-offset: calc(61px + 46px);
        --nav-logo-brief-text-fs: 12px;
    }
}