:root {
    --background-color: #FDFDFD;
    --background-color-opacity: rgba(253, 253, 253, 0.8);
    --main-color: #45454E;
    --accient-color: rgba(119, 131, 124);
    --accient-block-text-color: #FFFFFF;

    --letter-spacing: 2px;
    --text-main-color: #45454E;
    --header-text-line-height: 100%;
    --header-text-font-weight: 500;
    --header-text-font-size: 20px;
    --sub-header-text-line-height: 100%;
    --sub-header-text-font-weight: 300;
    --sub-header-text-font-size: 20px;
    --usual-text-line-height: 23px;
    --usual-text-font-weight: 300;
    --usual-text-font-size: 14px;

    --page-vertical-padding: 36px;
    --page-block-vertical-padding: 25px;

    --main-height: 100vh;
    --nav-width: 425px;
    --main-width: calc(100% - var(--nav-width));
    --nav-border: 1px solid var(--main-color);
    --nav-transition: .7s;
    --nav-container-max-height: calc(100% - var(--footer-height) + 1px);
    --nav-logo-height: 234px;
    --nav-logo-width: 307px;
    --nav-logo-form-height: 70px;
    --nav-projects-container-height: calc(100% - var(--nav-logo-height) - var(--nav-logo-form-height));
    --nav-logo-margin-bottom: 5px;
    --nav-projects-container-type-padding: 0 15px;
    --nav-about-container-text-scale: 1.05;
    --nav-projects-container-gap: 10px;
    --nav-project-container-gap: 20px;
    --nav-project-container-transition: opacity 0.3s ease, transform 0.3s ease;
}

* {
  font-family: "Circle", Arial, sans-serif;
}

body {
    background-color: var(--background-color);
    flex-direction: row;
    display: flex;
    margin: 0;
}

main {
    justify-content: space-between;
    height: var(--main-height);
    width: var(--main-width);
    flex-direction: column;
    align-items: center;
    position: relative;
    display: flex;
}

.header {
    background-color: var(--background-color);
    border-right: var(--nav-border);
    justify-content: space-between;
    height: var(--main-height);
    width: var(--nav-width);
    flex-direction: column;
    position: sticky;
    overflow: hidden;
    display: flex;
    top: 0;
}

.container {
    max-height: var(--nav-container-max-height);
    border-bottom: var(--nav-border);
    box-sizing: border-box;
    height: 100%;
}

.logo__container {
    padding: var(--page-vertical-padding) var(--page-vertical-padding) var(--page-block-vertical-padding);
    flex-direction: column;
    justify-content: start;
    align-items: start;
    display: flex;
}

.logo__container > a {
    margin-bottom: var(--nav-logo-margin-bottom);
    color: var(--accient-color);
    text-decoration: none;
    display: flex;
}

.logo__container > a > .header__logo {
    width: var(--nav-logo-width);
}

.logo__container > .header__brief_text {
    letter-spacing: var(--letter-spacing);
    line-height: var(--usual-text-line-height);
    font-weight: var(--usual-text-font-weight);
    font-size: var(--usual-text-font-size);
    color: var(--text-main-color);
    text-transform: uppercase;
    margin: 0;
}

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

.form__container > .form__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;
}

.form__container > .form__arrow {
    animation: arrowPulse 2s ease-in-out infinite;
}

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

.container > .projects__container {
    padding: 0 var(--page-vertical-padding) var(--page-block-vertical-padding);
    height: var(--nav-projects-container-height);
    flex-direction: column;
    justify-content: start;
    box-sizing: border-box;
    align-items: start;
    display: flex;
}

.container > .projects__container > .projects__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;
    margin: 0;
}

.container > .projects__container > .project_types {
    padding: var(--page-block-vertical-padding) 0;
    border-bottom: var(--nav-border);
    border-top: var(--nav-border);
    text-transform: uppercase;
    justify-content: start;
    align-items: center;
    flex-direction: row;
    display: flex;
    width: 100%;
    margin: 0;
}

.container > .projects__container > .project_types > .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);
    color: var(--text-main-color);
    text-transform: uppercase;
    cursor: pointer;
}

.container > .projects__container > .project_types > .project_type.selected,
.container > .projects__container > .project_types > .project_type:hover {
    text-decoration: underline;
}

.container > .projects__container > .project_types > .project_type:first-child {
    padding-inline-start: 0;
}

.container > .projects__container > .project_types > .project_type:last-child {
    padding-inline-end: 0;
    border-right: none;
}

.container > .projects__container > .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%;
    margin: 0;
}

.container > .projects__container > .projects_scroll_container::-webkit-scrollbar {
    height: 0;
    width: 0;
}

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

.container > .projects__container > .projects_scroll_container > .project_info > .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-decoration: none;
    cursor: pointer;
}

.container > .projects__container > .projects_scroll_container > .project_info > .project_shortname.selected,
.container > .projects__container > .projects_scroll_container > .project_info> .project_shortname:hover  {
    text-decoration: underline;
}

.container > .projects__container > .projects_scroll_container > .project_info > .project_shortname > a {
    text-decoration: none;
    color: inherit;
}

.container > .projects__container > .projects_scroll_container > .project_info > .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);
    text-transform: uppercase;
    color: var(--main-color);
    text-decoration: none;
}

.about_container {
    padding: var(--footer-padding);
    background-color: var(--background-color);
    justify-content: space-between;
    align-items: center;
    flex-direction: row;
    display: flex;
}

.about_container > .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;
}

.about_container > .about__title:hover {
    text-decoration: underline;
}

.about_container > .about__icon {
    transition: var(--nav-transition);
    cursor: pointer;
}

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

@font-face {
    font-family: "Circle";
    src: url("../../fonts/CRC35.047986b8d8ed.otf") format("truetype");
    font-weight: 300;
    font-style: normal;
    font-display: swap;
}

@font-face {
    font-family: "Circle";
    src: url("../../fonts/CRC55.3ada95e75f6f.otf") format("truetype");
    font-weight: 400;
    font-style: normal;
    font-display: swap;
}

@font-face {
    font-family: "Circle";
    src: url("../../fonts/CRC65.49f32e9f51bb.otf") format("truetype");
    font-weight: 500;
    font-style: normal;
    font-display: swap;
}

@font-face {
    font-family: "Circle";
    src: url("../../fonts/CRC75.0affa63db902.otf") format("truetype");
    font-weight: 600;
    font-style: normal;
    font-display: swap;
}

@media only screen and (max-width: 1240px) {
    :root {
        --page-vertical-padding: 30px;
    }
}

@media only screen and (max-width: 1080px) {
    :root {
        --sub-header-text-font-size: 18px;
        --usual-text-line-height: 20px;
        --header-text-font-size: 18px;
        --page-vertical-padding: 25px;
        --page-block-vertical-padding: 20px;
        --usual-text-font-size: 13px;
        --nav-logo-height: 120px;
        --nav-logo-width: 270px;
        --nav-width: 350px;
    }
}

@media only screen and (max-width: 960px) {
    :root {
        --page-vertical-padding: 30px;
        --page-block-vertical-padding: 20px;

        --sub-header-text-font-size: 16px;
        --usual-text-line-height: 20px;
        --usual-text-font-size: 13px;
        --header-text-font-size: 16px;
        --main-width: 100%;
        --nav-logo-width: auto;
        --nav-logo-margin-bottom: 0;
        --main-height: unset;
    }

    .header {
        display: none;
    }
}

@media only screen and (max-width: 760px) {
    :root {
        --page-block-vertical-padding: 15px;
        --page-vertical-padding: 20px;
    }
}

@media only screen and (max-width: 415px) {
    :root {
        --usual-text-font-size: 12px;
        --page-block-vertical-padding: 12px;
        --page-vertical-padding: 15px;
    }
}