:root{
    --background-color: rgb(27, 40, 56);
    --nav-background-color: rgb(14, 22, 34);
    --text-color: rgb(220, 220, 220);
    --text-color-hover: rgb(255, 255, 255);
    --arrow-menu-color: rgb(35, 38, 46);
}
header{grid-area: header}
nav{grid-area: nav;}
main{grid-area: main;}
footer{grid-area: footer;}
body{
    display: grid;
    grid-template-columns: 600px 1fr auto;
    grid-template-rows: auto auto;
    grid-template-areas: 
    "header nav nav"
    "main main main"
    "footer footer footer";
    margin: 0;
    color: var(--text-color);
    background-color: var(--background-color);
}
header{
    background-color: var(--nav-background-color);
    width: 600px;
    padding: 5px 5px 5px 20px;
    display: flex;
    align-items: center;
}
nav{
    display: flex;
    background-color: var(--nav-background-color);
    height: 100px;
    align-items: center;
    justify-content: flex-start;
    padding-left: 50px;
}
#nav_menu{
    column-gap: 30px;
}
nav a{
    text-decoration: none;
    color: var(--text-color);
    font-size: 18px;
}
nav a:hover{
    color: var(--text-color-hover);
}
main{
    margin-top: 40px;
    justify-self: center;
    width: 700px;
}
main p{
    font-size: 16px;
}
a{
    text-decoration: none;
    color: var(--text-color)
}
li a{
    color: blue;
}
ul{
    display: flex;
    flex-direction: column;
    gap: 20px;
    font-size: 14px;
}
#current_tab{
    text-decoration: underline;
    color: blue;
}
footer{
    height: 100px;
    margin-top: 600px;
    background-color: black;
    display: flex;
    align-items: center;
    justify-content: flex-start;
    padding-left: 20px;
}
.bold{
    font-weight: bold;
}
#arrow_menu{
    display: none;
    font-size: 30px;
    user-select: none;
    margin-left: 10px;
}

.blue_underline{
    text-decoration: underline;
    color: blue;
}
.flex{
    display: flex !important;
}
#buttons{
    margin-top: 30px;
    margin-bottom: 30px;
    display: grid;
    justify-content: space-between;
    grid-template-columns: auto auto auto;

}
#buttons a{
    margin-top: 20px;
    text-decoration: none;
    color: white;
    background-color: rgb(34, 134, 255);
    color: rgb(200, 200, 200);
    padding: 5px;
    width: 200px;
    height: 30px;
    display: flex;
    justify-content: center;
    align-items: center;
    border-radius: 3px;
    transition: 0.2s;
    user-select: none;
}
#buttons a:hover{
    background-color: rgb(6, 190, 255);
    color: rgb(255, 255, 255);
    transition: 0.2s;
}


@media (min-width: 1000px){
    #nav_menu{
        display: flex;
    }
}
@media (max-width: 1200px){
    body{
        grid-template-columns: 400px 1fr;
    }
    header{
        width: 400px;
        font-size: 12px;
    }
}
@media (max-width: 1000px){
    #nav_menu{
        top: 180px;
        grid-template-columns: auto;
        display: none;
        z-index: 1;
        flex-direction: column; 
        position: absolute;
        left: 0;
        background-color: var(--arrow-menu-color);
    }
    #nav_menu a{
        width: 100%;
        padding: 5px 0 5px 5px;
        border-top: 1px solid gray;
    }
    header{
        width: auto;
        justify-content: center;
        height: 80px;
    }
    nav{
        background-color: var(--arrow-menu-color);
        width: 100%;
    }
    body{
        grid-template-columns: 1fr;
        grid-template-rows: auto auto 1fr auto;
        grid-template-areas:
        "header"
        "nav"
        "main"
        "footer";
    }
    #arrow_menu{
        display: flex;
        cursor: pointer;
    }
    #nav_menu a:first-child{
        border-top: none;
    }
}
@media (max-width: 800px){
    main{
        width: 90%;
    }
    main h3{
        font-size: 30px;
    }
    main h2{
        font-size: 30px;
    }
    main p{
        font-size: 20px;
    }
    header{
        font-size: 12px;
        margin: 0;
        padding: 0;
    }
    #buttons{
        grid-template-columns: auto;
        justify-content: center;
    }
}