* {
    margin: 0;
    padding: 0;
    font-family: "B Mehr";
}

.header {
    min-height: 100vh;
    width: 100%;
    background-image: linear-gradient(rgba(4, 9, 30, 0.7), rgba(4, 9, 30, 0.7)), url("images/banner.jpg");
    background-position: center;
    background-size: cover;
    position: relative;
}

nav {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 2% 6%;
}

nav img {
    width: 150px;
}

.nav_link ul {
    display: flex;
    list-style: none;
    direction: rtl;
}

.nav_link ul li {
    padding: 8px 12px;

}

.nav_link ul li a {
    color: white;
    text-decoration: none;
    font-size: 13px;
}

.nav_link ul li::after {
    content: '';
    width: 0%;
    height: 2px;
    background-color: #f44336;
    display: block;
    transition: 0.5s;
    margin: auto;
}

.nav_link ul li:hover::after {
    width: 100%;
}

.text_box {
    width: 90%;
    color: white;
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    text-align: center;
}


.text_box h1 {
    font-size: 62px;
}

.text_box p {
    margin: 10px 0 40px 0;
}

.hero_btn {
    text-decoration: none;
    color: white;
    border: 1px solid #fff;
    padding: 12px 34px;
    font-size: 13px;
    background: transparent;
    cursor: pointer;
}

.hero_btn:hover {
    border: 1px solid #f44336;
    background-color: #f44336;
    transition: 1s;
}

nav .icon {
    display: none;
}

@media (max-width: 700px) {

    .text_box h1 {
        font-size: 20px;
    }

    .nav_link ul {
        display: block;
        padding: 30px;
    }

    .nav_link {
        background-color: #f44336;
        height: 100vh;
        width: 200px;
        position: absolute;
        top: 0;
        right: -200px;
        text-align: right;
        z-index: 2;
    }

    nav .icon {
        display: block;
        color: white;
        cursor: pointer;
        margin: 10px;
        font-size: 22px;
    }


}

/*---------course-----------*/


.course {
    width: 80%;
    margin: auto;
    text-align: center;
    margin-top: 100px;
}

h1 {
    font-size: 36px;
    font-weight: 600;
}

p {
    color: #777;
    font-size: 14px;
    font-weight: 300;
    line-height: 22px;
    padding: 10px;
}

.row {
    margin-top: 5%;
    display: flex;
    justify-content: space-between;
}

.course_col {
    flex-basis: 31%;
    background-color: #fff3f3;
    border-radius: 10px;
    margin-bottom: 10px;
    padding: 20px 12px;
    box-sizing: border-box;
    transition: 0.5s;
}

h3 {
    text-align: center;
    font-weight: 600;
    margin: 10px 0;
}

.course_col:hover {
    box-shadow: 0 0 20px #ccc;
}

@media (max-width: 700px) {

    .row {
        flex-direction: column;
    }

}


.res {
    width: 80%;
    margin: auto;
    text-align: center;
    padding-top: 50px;
}

.res_col {
    flex-basis: 32%;
    border-radius: 10px;
    margin-bottom: 30px;
    overflow: hidden;
    position: relative;
}

.layer {
    background-color: transparent;
    height: 100%;
    width: 100%;
    position: absolute;
    top: 0;
    left: 0;
    transition: 0.5s;
}

.layer:hover {
    background-color: rgba(266, 0, 0, 0.7);
}

.layer h3 {
    width: 100%;
    font-weight: 500;
    color: #fff;
    font-size: 26px;
    position: absolute;
    bottom: 0;
    left: 50%;
    opacity: 0;
    transform: translateX(-50%);
    transition: 0.5s;
}
.layer:hover h3{
    bottom: 50%;
    opacity: 1;
}
.res_col img{
    width: 100%;
    display: block;
}




/*--------article-----*/

.articles{
    width: 80%;
    margin: auto;
    text-align: center;
    padding-top: 100px;
}

.article_col{
    flex-basis: 31%;
    border-radius: 10px;
    margin-bottom: 5%;
    text-align: right;
}
.article_col img{
    width: 100%;
    border-radius: 10px;
}
.article_col h3{
    text-align: right;
}
.article_col p{
    padding: 0;
}



/*--------comment-------*/

.comment{
    width: 80%;
    margin: auto;
    text-align: center;
    padding-top: 100px;
}
.comment_col{
    flex-basis: 44%;
    border-radius: 10px;
    margin-bottom: 5%;
    text-align: left;
    background-color: #fff3f3;
    padding: 25px;
    cursor: pointer;
    display: flex;
}

.comment_col img{
    height: 40px;
    margin-left: 5px;
    margin-right: 30px;
    border-radius: 50%;
}
.comment_col p{
    text-align: left;
}
.comment_col h3{
    text-align: left;
}


/*--------contact_us-------*/

.contact_us{
    margin: 100px auto;
    width: 80%;
    background-image: linear-gradient(rgba(0,0,0,0.7),rgba(0,0,0,0.7)),url("images/footer.jpg");
    background-position: center;
    background-size: cover;
    text-align: center;
    padding: 100px 0;
    border-radius: 10px;
}
.contact_us h1{
    color: #fff;
    margin-bottom: 40px;
    padding: 0;
}

/*------footer-----*/
.footer{
    width: 100%;
    text-align: center;
    padding: 30px 0;
}
.footer h4{
    margin-bottom: 25px;
    margin-top: 20px;
    font-weight: 600;
}