/* main section */
main {
    width: 100%;
    height: 100vh;
    padding-top: 60px;
    background-image: url(../img/images/bg_image.jpg);
    background-size: cover;
    background-repeat: no-repeat;
    background-position: center;
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: 100;
    column-gap: 200px;
}

.main-intro h1 {
    font-size: 9.6rem;
    line-height: 1.1;
    margin-bottom: 20px;
}

main p {
    font-size: 1.8rem;
    line-height: 1.75;
    max-width: 500px;
}

main a {
    margin-top: 30px;
    width: fit-content;
    font-size: 1.8rem;
    display: block;
    background-color: var(--site-color-01);
    padding: 0px 20px;
}

main a:hover {
    background-color: var(--site-color-01-hover);
}

.main-quotes p {
    border-left: 4px solid var(--site-color-01);
    padding-left: 20px;
    margin: 40px 0;
}

main .main-quotes p:nth-child(2) {
    margin-left: 100px;
}

main .main-intro {
    padding-bottom: 8vh;
}

main .main-quotes {
    padding-bottom: 8vh;
}

/* category scetion */
.index-category {
    width: 100%;
    padding: 40px 0;
    display: flex;
    justify-content: center;
    column-gap: 20px;
    flex-wrap: wrap;
}

.index-category p {
    color: #000;
    font-size: 2.2rem;
    font-family: Roboto;
    text-align: center;
    padding: 40px;
    text-transform: uppercase;
    flex-basis: 100%;
}

.index-category-box {
    width: 20rem;
    height: 20rem;
    background-color: #000;
    background-repeat: no-repeat;
    background-size: cover;
    display: flex;
    justify-content: center;
    align-items: center;
    position: relative;
}

.dark-overlay {
    position: absolute;
    background-color: #000;
    top: 0;
    right: 0;
    left: 0;
    bottom: 0;
    opacity: 0.5;
    transition: all ease-in-out 200ms;
}

.index-category-box:hover .dark-overlay {
    opacity: 0;
    color: #1e1e1e;
}

.index-category-box:nth-child(2) {
    background-image: url(../img/images/DSA.png);
}

.index-category-box:nth-child(3) {
    background-image: url(../img/images/Database.jpg);
}

.index-category-box:nth-child(4) {
    background-image: url(../img/images/OOP.jpg);
}

.index-category-box:nth-child(5) {
    background-image: url(../img/images/programming.jpg);
}

.index-category-box h3 {
    font-size: 2.2rem;
    font-family: Roboto;
    color: #fff;
    text-align: center;
    line-height: 28px;
    text-shadow: -2px 2px 6px #000;
    z-index: 100;
}

/* about section  */
.index-about {
    width: 100%;
    padding: 60px 0;
    background-color: #1e1e1e;
}

.index-about-flex {
    display: flex;
    align-items: center;
    justify-content: center;
    column-gap: 60px;
}

.index-about-img img {
    width: 300px;
    border-radius: 300px;
}

.index-about-text {
    flex-basis: 455px;
}

.index-about-text h2 {
    color: #fff;
}

.index-about-text p {
    padding: 10px 0;
}

.index-about-text a {
    margin-top: 30px;
    width: fit-content;
    font-size: 1.8rem;
    display: block;
    background-color: var(--site-color-01);
    padding: 10px 20px;
}

.index-about-text a:hover {
    background-color: var(--site-color-01-hover);
}   

.index-about-skill {
    flex-basis: 350px;
}

.index-about-skill-bar {
    width: calc(100% - 8ox);
    margin: 10px 0;
    height: 20px;
    border: 4px solid #000;
}

.index-about-skill-bar-fill {
    height: 100%;
    background-color: var(--site-color-01);
}

.htmlcss {
    width: 80%;
}

.js {
    width: 70%;
}

.dsa {
    width: 75%;
}

.db {
    width: 10%;
}

.oop {
    width: 30%;
}

.prg {
    width: 60%;
}


/* Mobile version */

@media only screen and (max-width: 600px) {


    /* main section */
    main {
        align-items: center;
    }

    main .main-intro {
        padding-top: 8vh;
    }

    main .main-intro h1 {
        font-size: 5rem;
        line-height: 1.25;
        text-align: center;
    }

    main p {
        text-align: center;
        padding: 0 20px;
        font-size: 1.6rem;
        line-height: 1.75;
    }

    main a {
        margin: 30px auto;
    }

    .main-quotes {
        display: none;
    }

        
    /* category scetion */
    .index-category {
        padding: 0 0 20px;
        row-gap: 10px;
    }

    .index-category p {
        padding-bottom: 20px;
    }

    .index-category-box {
        width: calc(100% - 20px);
        height: 160px;
    }
        
    /* about section  */
    .index-about-flex {
        flex-wrap: wrap;
        row-gap: 20px;
    }

    .index-about-img {
        width: 60%;
    }

    .index-about-img img {
        width: 100%;
    }

    .index-about-text {
        flex-basis: 100%;
    }

    .index-about-text h2 {
        text-align: center;
    }

    .index-about-text p {
        text-align: center;
    }

    .index-about-text a {
        margin: 10px auto ;
    }

}