*{
    cursor: default;
    font-family: Arial, Helvetica, sans-serif;
    box-sizing: border-box;
}
html {
    height: 100vh;
    overflow-x: hidden;    
    background-size: 100%;
    display: flex;
    flex-direction: column;
    background: linear-gradient(90deg, rgb(0, 0, 0), rgb(0, 0, 20), rgb(0, 0, 30), rgb(0, 0, 20), rgb(0, 0, 0)) !important;
}
body {
    margin: 0;
    padding: 0;
}
#exit_2 {
    width: 15px;
    max-height: 15px !important;
}
main {
    min-height: 80vh;
}

::-webkit-scrollbar {
    background: linear-gradient(90deg, black, rgb(0, 0, 30), black);
}

::-webkit-scrollbar-thumb {
    background: radial-gradient(rgb(0, 0, 30), black 80%);
    border-radius: 30px;
    border: 0.01px solid rgb(20, 20, 20);
}

#main {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
}
#vr {
    background: linear-gradient(45deg, rgb(0, 0, 0), rgb(0, 0, 28), rgb(0, 0, 0));
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 0 2vw;
    height: 4vh;
}
#block_1 {
    /* position: fixed; */
    width: 100vw;
    position: sticky;
    top: 0;
    z-index: 1000;

    transition: transform 0.3s ease;
}

#header {
    position: sticky;
    top: 0;
    z-index: 99999;
}


#block_1.hide {
    transform: translateY(-100%);
}

#zagalovok {
    list-style: none;
    padding: 0;
    float: right;
}
#name {
    position: relative;
    float: left;
    font-size: 20px;
    color: white;
    user-select: none;
    z-index: 1000;
}

#zagalovok a {
    text-decoration: none;
    color: rgb(255, 255, 255);
    transition: 0.5s;
    font-size: 15px;
    margin-left: 10px;
}
#zagalovok a:hover {
    text-shadow: -1px 1px 10px rgb(0, 0, 0);
    line-height: 100%;
    transition: 0.5s;
    border-bottom: 1px solid white;
}
h3 {
    position: relative;
}
#menu {
    display: none;
    z-index: 99999;
}
h3:hover > #menu  {
    display: none;
    background-color: black;
}
#menu_burger {
    width: 15px;
    height: 15px;
    display: none;
    margin-right: 3px;
}
#mb {
    display: flex;
    flex-direction: row;
    align-items: center;
    justify-content: center;
    z-index: 99999;
}
#vr_2 {
    display: flex;
    justify-content: center;
    width: auto;
    margin-bottom: -20px !important;
    bottom: 0;

}
#end {
    background-color: rgb(0, 0, 0);
    width: 100vw;
    color: #fff;
}
#end #ending {
    display: flex;
    list-style: none;
    /* margin-right: 3vh; */
}
#end #ending li {
    padding: 0 5px;
    margin-right: 150px;
}
#end #ending li h3 {
    text-decoration: none;
    color: white;
    transition: 0.3s;
}
#end #ending li a:hover {
    /* text-shadow: -1px 1px 10px rgb(255, 255, 255); */
    transition: 0.3s;
    color: blue;
}
#end #ending li a:active {
    color: red;
}
#kontacts {
    display: flex;
    flex-direction: column;
}
#kontacts ul {
    width: 200px;
    margin-bottom: 10px;
}
#reck {
    margin-left: -150px;
}
#ava {
    border-radius: 50%;
}
#hr {
    display: block;
    width: 100%;
    margin-top: 10px;
}
#sp, #me {
    max-width: 350px !important;
    margin-right: 5vh !important;
}

@media screen and (max-width: 450px) {
    html {
        background-size: 100%;
        display: flex;
        flex-direction: column;
        height: auto;
        background: linear-gradient(90deg, rgb(0, 0, 0), rgb(0, 0, 55), rgb(0, 0, 85), rgb(0, 0, 55), rgb(0, 0, 0)) !important;
    }
    #end {
        background-color: rgb(0, 0, 0);
        width: 100vw;
        color: #fff;
    }        
    #kontacts {
        flex-direction: column;
    }    
    #kontacts ul {
        margin-right: -5vw;
        margin-bottom: 10px;
    }
    #kontacts ul li {
        width: 100px;
    }
    #end #ending li {
        padding: 0 5px;
        margin-right: 0;
    }
    #end #ending {
        display: flex;
        list-style: none;
        flex-direction: column;
    }
    #reck {
        display: flex;
        flex-direction: column;
        margin: 0 ;
    }
    #vr {
        background: black !important;
        box-shadow: 1px 1px 10px 1px black; 
    }
    h3 {
        position: relative;
    }
    #menu {
        height: 100vh;
        width: 280px;
        display: none;
        list-style: none;
        position: absolute;
        padding: 0;
        top: 0;
        margin-left: -10px;
        z-index: 99999;
        background-color: black;
    }
    #menu_burger{
        display: block;
    }
    #menu li {
        min-width: 180px;
        display: list-item;
        float: none;
        background-color: black;
    }
    #home {
        margin-top: 40px;
    }
    #exit {
        width: 15px;
        max-height: 15px !important;
    }
    h3:hover > #menu  {
        display: inherit;
        background-color: black;
        z-index: 9999;
    }
    #menu li a:hover > #menu  {
        display: block;
        background-color: black;
    }
    #menu li:hover > #menu  {
        display: inherit;
        background-color: black;
    }

    #menu li a {
        margin-top: 30px;
        padding: 0px 15px;
        display: block;
        color: white;
        font-size: 18px;
        line-height: 16px;
        text-decoration: none;
    }    
    .hidd {
        display: none;
    }
    .chemistry {
        display: none;
    }
    .physics {
        right: 0;
        margin-right: 0 !important;
    }
    #gran {
        height: 160px;
        min-height: 160px;
    }
    #sp, #me {
        max-width: 90vw;
        margin-right: 0;
    }
    
}
@media screen and (max-width: 850px){
    #kontacts {
        flex-direction: column;
    }
    #kontacts ul {
        margin-right: -5vw;
        margin-bottom: 10px;
    }
    #me, #sp {
        max-width: 250px;
        margin-right: 0;
    }
}