html {
    box-sizing: border-box;
}

*,
*:before,
*:after {
    box-sizing: inherit;
}
@font-face {
    font-family: 'SF Mono';
    src: url('/fonts/sf-mono/SFMonoRegular.otf') format('opentype');
    font-weight: normal;
    font-style: normal;
}
:root {
    --black: #0B0C10;
    --darkgrey: #1F2833;
    --darkgrey-opacity: rgba(31, 40, 51, 0.5);
    --grey: #C5C6C7;
    --lightblue: #66FCF1;
    --lightblue-opacity: rgba(102, 252, 241, 0.5);
    --darkblue: #45A29E;
    --darkblue-opacity: rgba(69, 162, 158, 0.5);
    --black-opacity: rgba(11, 12, 16, 0.8);

    --navy-shadow: rgba(2,12,27,0.7);

    --font-Roboto: "Roboto", sans-serif;
    --font-Mono: 'SF Mono', sans-serif;


    --hamburger-width: 30px;
    --ham-before: top 0.1s ease-in 0.25s,opacity 0.1s ease-in;
    --ham-before-active: top 0.1s ease-out,opacity 0.1s ease-out 0.12s;
    --ham-after: bottom 0.1s ease-in 0.25s,transform 0.22s cubic-bezier(0.55,0.055,0.675,0.19);
    --ham-after-active: bottom 0.1s ease-out,transform 0.22s cubic-bezier(0.215,0.61,0.355,1) 0.12s;
}
html,
body {
    width: 100%;
    height: 100%;
    background-color: var(--black);
    margin: 0;
    counter-reset: section; /* или section 0, чтобы начиналось с 0 */
    font-family: var(--font-Mono);

    /*background-image: url('/svg/fone.svg'); !* путь к файлу *!*/
    /*background-repeat: repeat;                      !* повтор по X и Y *!*/
    /*background-size: 100px 100px;                  !* масштаб плитки *!*/
}

/*пре-лоадер*/
.pre-loader {
    position: fixed;
    z-index: 100;
    width: 100%;
    height: 100%;
    transition: transform 400ms ease-in-out, opacity 200ms linear;
    background-color: var(--darkgrey);
    display: flex;
    justify-content: center;
    align-items: center;
    opacity: 1;
    transform: scale(1);
}
.pre-loader.collapsed {
    opacity: 0;
    transform: scale(0);/*вернись в ничто*/
}

svg {
    width: 100%;
    height: 100%;
    display: block;
    margin: 0 auto;
    fill: none;
}
#hexagon {
    transform-box: fill-box;
    transform-origin: center;
}
/*Конец стилей прелодера*/

.container {
    width: max-content;
    max-width: 100px;
}

header{
    display: flex;
    justify-content: space-between;
    align-items: center;
    position: fixed;
    width: 100%;
    height: 80px;
    top: 0;
    left: 0;
    z-index: 10;
    padding: 0 50px;
    background-color: var(--black-opacity);
    /*background-color: var(--darkgrey-opacity);*/
    backdrop-filter: blur(10px);
    transition: transform 0.2s ease-in-out, box-shadow 0.2s ease-in-out;

}
header.header-shadow {/*Стиль когда страница проскролена вниз*/
    box-shadow: 0 10px 20px rgba(0, 0, 0, 0.5);
}
header.header-hidden {
    transform: translateY(-100%);
    box-shadow: 0 0 0 rgba(0, 0, 0, 0.0);

}

header .logo{
    width: 50px;
    height: 50px;
}
header .menu{
    display: flex;
    align-items: center;
}
header .menu ol{
    display: flex;
    list-style: none;
    gap: 10px;
}
header .menu ol li{
    margin: 0 5px;
    counter-increment: item;
}
header .menu ol li a{
    text-decoration: none;
    color: var(--grey);
}
header .menu ol li a::before {
    content: "0" counter(item) ".";
    margin-right: 5px;
    color: var(--lightblue);
    font-family: var(--font-Mono);
    font-size: 15px;
    text-align: right;
}
header .menu .resume{
    height: 100%;
    color: var(--grey);
    padding: 10px;
    border: 1px var(--lightblue) solid;
    border-radius: 5px;
    margin-left: 15px;
}
header .menu .resume a{
    color: var(--lightblue);
}
header .menu .resume:hover{
    background: rgb(12, 120, 114, 0.3);
}


.menu ol li,
.menu .resume {
    opacity: 0;
    transform: translateY(-10px);
    transition: all 0.5s ease-in-out;
}

.menu ol li.show,
.menu .resume.show {
    opacity: 1;
    transform: translateY(0);
}

/*left*/
.left{
    width: 40px;
    position: fixed;
    bottom: 0px;
    left: 40px;
    right: auto;
    z-index: 10;
    transition: transform 0.4s ease;
    transform: translateX(-200%);
    /*color: var(--light-slate);*/
}
.left.is-visible{
    transform: translateX(0%);
}

.left ul{
    display: flex;
    flex-direction: column;
    -webkit-box-align: center;
    align-items: center;
    margin: 0px;
    padding: 0px;
    list-style: none;
    gap: 20px;
}
.left ul li{
    list-style: none;
}
.left ul li a{
    display: inline-block;
    text-decoration: none;
    text-decoration-skip-ink: auto;
    color: inherit;
    position: relative;
    cursor: pointer;
    transition: all 0.3s ease;
}
.left ul li a svg{
    color: var(--grey);
    width: 20px;
    height: 20px;
    fill: var(--grey);
}

.left ul li a:hover {
    transform: translateY(-3px);
}
.left ul li a:hover svg{
    color: var(--lightblue);
    fill: var(--lightblue);
}

.left ul li:nth-child(2) a svg,
.left ul li:nth-child(3) a svg
{
    fill: none;
}

.left ul::after{
    content: "";
    display: block;
    width: 1px;
    height: 90px;
    margin: 0px auto;
    background-color: var(--grey);
}
/*right*/
.right{
    width: 40px;
    position: fixed;
    bottom: 0px;
    left: auto;
    right: 40px;
    z-index: 10;
    transition: transform 0.4s ease;
    transform: translateX(200%);

    /*color: var(--light-slate);*/
}
.right.is-visible{
    transform: translateX(0%);
}

.right .right_email{
    display: flex;
    flex-direction: column;
    -webkit-box-align: center;
    align-items: center;
    position: relative;
}
.right .right_email a{
    margin: 20px auto;
    padding: 10px;
    letter-spacing: 0.1em;
    -webkit-writing-mode: vertical-rl;
    writing-mode: vertical-rl;
    color: var(--grey);
    text-decoration: none;
    transition: all 0.3s ease;
}
.right .right_email a:hover {
    transform: translateY(-3px);
    color: var(--lightblue);
}
.right .right_email::after{
    content: "";
    display: block;
    width: 1px;
    height: 90px;
    margin: 0px auto;
    background-color: var(--grey);
}
/*main-content*/
.main{
    display: none;
    opacity: 0;
    transition: all 0.1s ease;
}
.main.show{
    display: block;
    opacity: 1;
}
.content{
    max-width: 1500px;
    margin: 0 auto;
    min-height: 100vh;
}
section{
    margin: 0px auto;
    padding: 100px 0px;
    max-width: 1000px;
}
h1, h2, h3, h4, h5, h6 {
    margin: 0px 0px 10px;
    color: var(--grey);
    line-height: 1.1;

    /*font-family: var(--font-Roboto);*/
    font-family: var(--font-Mono);

    font-optical-sizing: auto;
    font-weight: 600;
    font-style: normal;
    font-variation-settings:
            "wdth" 100;
}
a{
    /*font-family: var(--font-Roboto);*/
    font-family: var(--font-Mono);

    font-optical-sizing: auto;
    font-weight: 600;
    font-style: normal;
    font-variation-settings:
            "wdth" 100;
}
p{
    margin: 20px 0px 0px;
    max-width: 750px;
    font-size: 20px;

    color: var(--grey);
    font-family: var(--font-Mono);
    font-optical-sizing: auto;
    font-weight: 400;
    font-style: normal;
    font-variation-settings:
            "wdth" 100;
}
.numbered-heading{
    display: flex;
    -webkit-box-align: center;
    align-items: center;
    position: relative;
    margin: 10px 0px 40px;
    width: 100%;
    font-size: clamp(26px,5vw,32px);
    white-space: nowrap;
    color: var(--grey);

}
.numbered-heading::before {
    position: relative;
    bottom: -2px;
    counter-increment: section 1;
    content: "0" counter(section) ".";
    margin-right: 10px;
    color: var(--lightblue);
    font-family: var(--font-Mono);
    font-size: clamp(16px,3vw,20px);
    font-weight: 500;
}
.numbered-heading::after {
    content: "";
    display: block;
    position: relative;
    top: 2px;
    width: 300px;
    height: 1px;
    margin-left: 20px;
    background-color: var(--darkgrey);
}
/*main-0*/
.main_0{
    display: flex;
    -webkit-box-pack: center;
    justify-content: center;
    -webkit-box-align: center;
    flex-direction: column;
    align-items: flex-start;
    min-height: 100vh;
    padding: 0px;

    color: white;
}
.main_0 .hello h1 {
    margin: 0px 0px 30px 4px;
    font-size:20px;
    color: var(--grey);
    font-weight: 400;
}
.main_0 .name h2{
    margin: 0px;
    font-size: clamp(40px, 8vw, 80px);
    color: var(--lightblue);
}
.main_0 .about h3{
    margin: 0px;
    font-size: clamp(40px, 8vw, 80px);

    margin-top: 10px;
    color: var(--darkblue);
    line-height: 0.9;

}
.main_0 .resume_button {
    margin-top: 40px;
}
.main_0 .resume_button a{
    text-decoration: none;
    color: var(--lightblue);
    border: 1px var(--lightblue) solid;
    padding: 10px;
}
/*main-1*/
.main_1{
    padding: 100px 50px;
}
.about-blocks{
    display: flex;
    width: 100%;
}
.about-text{
    width: 60%;
    padding-right: 5%;
}
.about-img{
    width: 35%;
}
.about-img .image-container{
    aspect-ratio: 1/1;
    max-height: 300px;
    position: relative;
    border-radius: 5px;
}
.about-img .image-container::before {
    content: "";
    display: block;
    position: absolute;
    width: 100%;
    height: 100%;
    border-radius: 5px;
    transition: all 0.2s ease;
    background-color: var(--lightblue-opacity);
    opacity: 1;
}
.about-img .image-container:hover::before {
    opacity: 0; /
}
.about-img .image-container::after {
    content: "";
    display: block;
    position: absolute;
    width: 100%;
    height: 100%;
    border-radius: 5px;
    transition: all 0.2s ease;
    border: 2px solid var(--lightblue);
    top: 20px;
    left: 20px;
    z-index: -1;
}
.about-img .image-container:hover::after {
    top: 12px;
    left: 12px;
}
.about-img .image-container img{
    width: 100%;
    height: 100%;
    object-fit: cover;
    border-radius: 5px;
}

/*main-2*/
.main_2{
    padding: 100px 100px;
}
.experience{
    display: flex;
    justify-content: space-between;
}
.experience__content{
    width: 80%;
}
.experience__content .slide {
    width: 100%;
    visibility: hidden;
    opacity: 0;
    height: 0;
    transition: opacity 0.5s ease-in-out;
}
.experience__content .slide.active {
    visibility: visible;
    height: 100%;
    opacity: 1;
}
.experience__tabs{
    display: flex;
    flex-direction: column;
    width: 15%;
}
.experience__tabs {
    position: relative;
    display: flex;
    flex-direction: column;
    width: 15%;
}
.experience__tabs .tab {
    transition: all 0.3s ease;
    width: 100%;
    cursor: pointer;
    padding: 10px 10px;
    margin-right: 5px;
    display: inline-block;
    color: var(--grey);
    font-family: var(--font-Mono);
}
.experience__tabs .tab:hover{
    background-color: var(--darkgrey-opacity);
    color: var(--lightblue);
}
.experience__tabs .tab.active {
    background-color: var(--darkgrey-opacity);
    color: var(--lightblue);
}
.tabs-indicator {
    position: absolute;
    left: 0;
    width: 2px;
    height: calc(100% / 3);
    background-color: var(--lightblue);
    border-radius: 2px;
    transform: translateY(0);
    transition: transform 0.3s ease-in-out;
}
/*main-3*/
.main_3{

}

.main_3 .project li{
    position: relative;
    display: grid;
    gap: 10px;
    grid-template-columns: repeat(12, 1fr);
    align-items: center;
    margin-bottom: 100px;
}
.main_3 .project li:last-child {
    margin-bottom: 0;
}

.main_3 .project li .project__content {
    position: relative;
    grid-area: 1 / 1 / -1 / 7;
}
.main_3 .project li:nth-of-type(2n+1) .project__content {
    grid-column: 7 / -1;
    text-align: right;
}
.main_3 .project li .project__image {
    box-shadow: 0 10px 30px -15px var(--navy-shadow);/*темно себрое что-то*/
    transition: all 0.4s ease;
    grid-area: 1 / 6 / -1 / -1;
    position: relative;
    z-index: 1;

}
.main_3 .project li:nth-of-type(2n+1) .project__image {
    grid-column: 1 / 8;
}
.main_3 .project li .project__image img{
    width: 100%;
    height: 100%;
    object-fit: contain;
    filter: grayscale(75%);
    transition: all 0.3s ease;


}
.main_3 .project li .project__image:hover img {
    filter: grayscale(0%);
}

.main_3 .project li .project__image:after {
    content: '';
    position: absolute;
    background-color: var(--darkblue-opacity);
    width: 100%;
    height: calc(100% - 4px);
    top: 0;
    left: 0;
    z-index: 1;
    opacity: 1;
    transition: all 0.3s ease;
}
.main_3 .project li .project__image:hover:after {
    opacity: 0;
}


.main_3 .project li .project__content .project-overline{
    margin: 10px 0px;
    color: var(--grey);
    font-family: var(--font-Mono);
    font-size: 13px;
    font-weight: 400;
}
.main_3 .project li .project__content .project-title{
    color: var(--lightblue);
    font-size: clamp(24px, 5vw, 28px);
}
.main_3 .project li .project__content .project-description{
    box-shadow: 0 10px 30px -15px var(--navy-shadow);
    transition: all 0.4s ease;
    position: relative;
    z-index: 2;
    padding: 25px;
    border-radius: 5px;
    background-color: var(--darkgrey-opacity);
    color: var(--grey);
    font-size: 18px;
}
.main_3 .project li .project__content .project-description p{
    margin: 20px 0;
    font-size: 18px;
}

.main_3 .project li .project__content .project-tech-list{
    display: flex;
    flex-wrap: wrap;
    position: relative;
    z-index: 2;
    margin: 25px 0px 10px;
    padding: 0px;
    list-style: none;
}
.main_3 .project li:nth-of-type(2n+1) .project__content .project-tech-list{
    -webkit-box-pack: end;
    justify-content: flex-end;
}
.main_3 .project li .project__content .project-tech-list li{
    margin: 0px 20px 5px 0px;
    color: var(--grey);
    font-family: var(--font-Mono);
    font-size: 13px;
    white-space: nowrap;
    display: inline;
}
.main_3 .project li:nth-of-type(2n+1) .project__content .project-tech-list li {
    margin: 0px 0px 5px 20px;
}


.main_3 .project li .project__content .project-links{
    display: flex;
    -webkit-box-align: center;
    align-items: center;
    position: relative;
    margin-top: 10px;
    margin-left: -10px;
    color: var(--darkgrey);
}
.main_3 .project li:nth-of-type(2n+1) .project__content .project-links {
    -webkit-box-pack: end;
    justify-content: flex-end;
    margin-left: 0px;
    margin-right: -10px;
}
.main_3 .project li .project__content .project-links a{
    height: 25px;
    padding: 0 10px;
}
/*.main_3 .whatido{
    width: 100%;
}
.main_3 .whatido ul li {
    margin: 10px 0px 10px;
    max-width: 750px;
    font-size: 20px;
    color: var(--grey);
    font-family: var(--font-Mono);
    font-optical-sizing: auto;
    font-weight: 400;
    font-style: normal;
    font-variation-settings:
            "wdth" 100;
}
.myvalue{
    margin-top: 50px;
    background-color: var(--darkgrey);
    display: inline-block;
    padding: 20px;
    margin-left: 50px;
}
.myvalue p{
    color: var(--darkblue);
    margin-top: 0;
    font-family: var(--font-Mono);

}*/

/*main-4*/
.main_4{
    padding: 100px 200px;
    min-height: 70vh;
}
.main_4 h2{
    display: flex;
    justify-content: center;
    font-size: clamp(30px,5vw,35px);

}
.main_4 .numbered-heading{
    font-family: var(--font-Mono);
    margin: 10px 0px 10px;
    width: 100%;
    align-items: center;
    justify-content: center;
    font-size: clamp(14px,5vw,16px);
    white-space: nowrap;
    color: var(--lightblue);
}
.main_4 .numbered-heading::before {
    position: relative;
    bottom: -2px;
    counter-increment: section 1;
    content: "0" counter(section) ".";
    margin-right: 10px;
    color: var(--lightblue);
    font-family: var(--font-Mono);
    font-size: clamp(12px,3vw,14px);
    font-weight: 500;
}
.main_4 .numbered-heading::after {
    content: none;
}
.main_4 p{
text-align: center;
}
.main_4 .sayhello{
    margin-top: 35px;
    display: flex;
    justify-content: center;
}
.main_4 .sayhello a{
    text-decoration: none;
    padding: 15px 20px;
    border: 1px solid var(--lightblue);
    color: var(--lightblue);
    transition: all 0.4s ease;
}
.main_4 .sayhello a:hover {
    background-color: var(--darkblue-opacity);
}

/*animation*/
.hero-item {
    opacity: 0;
    transform: translateY(5px);
    transition: opacity 0.4s ease, transform 0.4s ease;
}

.hero-item.is-visible {
    opacity: 1;
    transform: translateY(0);
}

.main_1, .main_2, .main_4{
    opacity: 0;
    transform: translateY(5px);
    transition: opacity 0.5s ease-in-out, transform 0.5s ease-in-out;
}

.main_1.is-visible, .main_2.is-visible, .main_4.is-visible{
    opacity: 1;
    transform: translateY(0);
}

.main_3 .numbered-heading,
.main_3 .project li {
    opacity: 0;
    transform: translateY(5px);
    transition: opacity 0.5s ease-in-out, transform 0.5s ease-in-out;
}

.main_3 .numbered-heading.is-visible,
.main_3 .project li.is-visible {
    opacity: 1;
    transform: translateY(0);
}

@media (max-width: 1239px) {
    .content { padding: 0 100px; }
}

@media (max-width: 779px) {
    .content { padding: 0 50px; }
    .left, .right { display: none; }
    .pre-loader { transform: scale(1); }
    header{
        padding: 0 15px;
        width: 100%;
    }
    .main_0, .main_1, .main_2, .main_3, .main_4{
        display: none;
    }

    .menu_mobile_button {
        position: relative;
        width: var(--hamburger-width);
        height: 24px;
    }

    /* центральная линия */
    .menu_mobile_icon {
        position: absolute;
        top: 0;
        left: 0;
        width: 100%;
        height: 2px;
        background-color: var(--lightblue);
        border-radius: 4px;
        transform: translateY(-50%);
    }

    /* верхняя и нижняя линии */
    .menu_mobile_icon::before,
    .menu_mobile_icon::after {
        content: "";
        position: absolute;
        right: 0;
        height: 2px;
        border-radius: 4px;
        background-color: var(--lightblue);
    }
    .menu_mobile_icon::before{
        width: 75%;
    }
    .menu_mobile_icon::after {
        width: 50%;
    }
    .menu_mobile_icon::before {
        top: 10px;   /* вверх от центра */
    }

    .menu_mobile_icon::after {
        top: 20px;    /* вниз от центра */
    }

    header .menu{
        position: fixed;
        right: 0;
        top: 0;
        height: 100vh;
        z-index: 30;
        width: 280px;
        flex-direction: column;
        justify-content: center;
        align-items: center;
        background: var(--darkblue-opacity);
    }
    header .menu ol{
        flex-direction: column;
        gap: 50px!important;
        padding: 0;

    }
    header .menu ol li{
        opacity: 1;
        transform: none;
        justify-content: center;
        align-items: center;
        text-align: center;
    }
    header .menu ol li a{
        position: relative;


    }
    header .menu ol li a::before{
        position: absolute;
        top: -20px;
        left: 50%;
        transform: translateX(-50%);
        margin-right: 0;         /* убираем правый отступ */
        padding-left: 5px;
        margin-bottom: 5px;      /* отступ снизу от цифры */
        display: block;          /* делаем блочным элементом */
        text-align: center;
    }
    header .menu .resume{
        opacity: 1;
        transform: none;
        height: auto;
        margin-top: 20px;
        padding: 16px 40px;
    }



}