style.css

:root {
    --white: #ffffff;
    --black: #2b2a2c;
    --gray: #6a696b;
    --gray-light: #dedede;
}

*,
*:before,
*:after {
    box-sizing: border-box;
}

body {
    margin: 0;
    font-family: 'Montserrat', sans-serif;
    font-size: 1rem;
    color: var(--black);
}

h1, h2, h3, h4, h5, h6 {
    margin: 0;
}

p {
    margin: 0 0 1rem;
}

.container {
    width: 100%;
    max-width: 1200px;
    padding-left: 1rem;
    padding-right: 1rem;
    margin: 0 auto;
}

.header {
    padding: 1.2rem 0;
    position: relative;
}

.header_inner {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.user {
    display: flex;
}

.user_avatar {
    border-radius: 50%;
}

.user_content{
    padding-left: 9px;
}

.user_name {
    font-size: 1rem;
    color: var(--black);
    font-weight: bold;
    margin-bottom: 3px;
}

.user_prof {
    font-size: 0.75rem;
    color: var(--black);
    opacity: 0.7;
}

.nav {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    height: 100%;
}

.nav_link {
    margin-left: 2rem;
    position: relative;
    font-size: 0.9rem;
    color: var(--black);
    font-weight: bold;
    text-transform: uppercase;
    text-decoration: none;
}

.nav_link:hover {
    border-bottom: 2px solid black;
    padding: 0 0 4px;
}

.intro_inner {
    display: flex;
    padding-top: 6.6rem;
    padding-bottom: 8rem;
    position: relative;

    border-bottom: 1px solid black;
}

.intro_subtitle {
    color: var(--black);
    font-weight: 200;
    font-size: 2rem;
}

.intro_title {
    color: var(--black);
    font-weight: bold;
    font-size: 3rem;
    margin-bottom: 5px;
}

.intro_text
{
    color: var(--black);
    font-size: 1.2rem;
    opacity: 0.7;
}

.social {
    display: flex;
    margin-top: 2rem;
    margin-bottom: 2.5rem;
}

.social_link {
    margin-right: 0.75rem;
    text-decoration: none;
}

.social_link:hover {
    transform: translateY(-5px);
}

.btn {
    display: inline-block;
    vertical-align: top;
    padding: 1rem 2rem;
    width: 12.5rem;

    border: 1px solid black;
    border-radius: 1.8rem;
    background: none;
    cursor: pointer;
    
    font-size: 1rem;
    color: var(--black);
    text-transform: uppercase;
    text-decoration: none;
    text-align: center;
    opacity: 0.7;
}

.btn:hover {
    background: black;
    color: white;
}

.intro_photo {
    position: absolute;
    bottom: -1px;
    right: 0;
    z-index: 1;
    margin-bottom: 1rem;
}

.text_center {
    margin-top: 3.5rem;
    margin-bottom: 1.5rem;
    text-align: center;
    color: var(--black);
    font-size: 2.8rem;
    font-weight: bold;
}

.works {
    margin-bottom: 7rem;
}

.portfolio {
    display: flex;
    justify-content: space-between;
    flex-wrap: wrap;
}

.work {
    overflow: hidden;
    box-shadow: 0 0 4px black;
    border-radius: 10px;
    margin-bottom: 1rem;
    cursor: pointer;
}

.work:hover {
    box-shadow: 0 0 25px black;
}

.work_content {
    padding: 1rem 0.8rem;
}

.work_cat {
    font-size: 0.75rem;
    color: var(--black);
    text-transform: uppercase;

    margin-bottom: 0.4rem;
}

.work_title {
    display: flex;
    justify-content: space-between;
    font-size: 1rem;
    color: var(--black);
    font-weight: bold;
    text-transform: uppercase;
}

.about_inner {
    display: flex;
    flex-wrap: wrap;
    margin-bottom: 7rem;
}

.about_title {
    font-weight: bold;
    color: var(--black);
    font-size: 2.8rem;
    text-transform: uppercase;
}

.about_photo {
    max-width: 50%;
    padding-left: 3.5rem;
}

.about_content {
    width: 50%;
    margin-top: 5rem;
    padding-left: 7.5rem;
}

.about_bigtitle {
    font-size: 5.2rem;
    font-weight: bold;
    color: var(--gray-light);
    text-transform: uppercase;
}

.about_text {
    margin-top: 2.5rem;
    margin-bottom: 3.5rem;

    font-size: 0.75rem;
    font-weight: 300;
    color: var(--gray);
}

.reviews {
    background: #332f30 url(images/reviews.png) center no-repeat;
    padding: 3rem 0;
    position: relative;
}

.reviews_inner {
    width: 100%;
    max-width: 830px;
    margin: 0 auto;
}

.reviews_text {
    color: var(--white);
    font-size: 0.9rem;
    text-align: center;
}

.reviews_author {
    width: 100%;
    margin-top: -51px;
    text-align: center;
    position: absolute;
    top: 100%;
    left: 0;
}

.reviews_author_logo {
    border-radius: 50%;
    box-shadow: 0 0 2px black;
}

.reviews_company {
    margin-bottom: 0.3rem;

    font-size: 1rem;
    color: var(--black);
    font-weight: bold;
}

.reviews_name {
    margin-bottom: 0.5rem;
    font-size: 0.9rem;
    color: var(--gray);
    font-weight: 300;
    font-style: italic;
}

.reviews_star_unactive {
    opacity: 0.3;
}

.reviews_rating {
    margin-bottom: 6rem;
}

.courses {
    margin-top: 14rem;
    margin-bottom: 8rem;

}

.subtitle {
    text-align: center;

    font-size: 1.1rem;
    color: var(--gray);
    font-weight: 300;
}

.margin {
    margin-bottom: 1rem;
    text-transform: uppercase;
}

.courses_inner {
    display: flex;
    flex-wrap: wrap;
    justify-content: space-between;
    margin-top: 3.5rem;
}

.course {
    width: 33%;
    padding: 0 1rem;
}

.course_name {
    margin-top: 1.3rem;
    margin-bottom: 0.6rem;
    font-size: 1rem;
    color: var(--black);
    font-weight: bold;
}

.course_cat {
    margin-bottom: 1.5rem;
    font-style: 0.75rem;
    color: var(--gray);
}

.course_text {
    font-size: 0.75rem;
    color: var(-gray);
    font-weight: 300;
}

.btn_edit {
    margin-top: 1.5rem;
    width: 130px;
    height: 34px;
    font-size: 0.9rem;
    padding: 0.5rem 0.75rem;
    font-weight: bold;
}

.link {
    margin-top: 1rem;  
    text-align: right;
}

.course_link {
    font-size: 0.9rem;
    color: var(--gray);
}

.footer {
    padding: 1rem 0;
    background-color: #2b2a2c;
}

.footer_inner {
    display: flex;
    flex-wrap: wrap;
    justify-content: space-between;
}

.footer_info {
    display: flex;
    align-items: center;
}

.footer_copyright {
    padding-right: 1rem;
    margin-right: 1rem;
    font-size: 0.9rem;
    color: #747475;
    border-right: 1px solid #747475;
}

.footer_social {
    display: flex;
    align-items: center;
}

.footer_link {
    margin-right: 1rem;
    text-decoration: none;
}

.footer_nav {
    display: flex;
    align-items: center;
}

.footer_nav_link {
    font-size: 0.9rem;
    color: var(--gray);
    margin-left: 1rem;
    text-decoration: none;
}

.modal {
    display: none;
    width: 100%;
    height: 100%;
    padding: 1rem;
    overflow: auto;
    background-color: rgba(192, 192, 192, 0.9);
    position: fixed;
    top: 0;
    left: 0;
    z-index: 1000;
}

.show {
    display: flex;
}

.modal_dialog {
    width: 100%;
    max-width: 800px;
    text-align: center;
    margin: auto;
    position: relative;
    background-color: white;
}

.modal_title {
    font-size: 2rem;
    color: var(--black);
    font-weight: bold;
    padding: 3rem 0;
}

.modal_photo {
    width: 100%;
    height: 100%;
}

.btn_modal {
    margin: 3rem 0;
}

@media(max-width:1199px) {
    .intro {
        margin-top: -5rem;
    }

    .intro_inner {
        display: flex;
        flex-wrap: wrap-reverse;
        padding: 5rem 0;
    }

    .intro_photo {
        width:100%;
        position: relative;
    }

    .work {
        margin: 1rem auto;
        border-radius: 1.5rem;
        width: 98%;
    }

    .work_photo {
        width: 100%;
    }

    .work_cat {
        font-size: 1.2rem;
    }

    .work_title {
        font-size: 1.5rem;
    }

    .about_photo {
        width: 100%;
        height: 100%;
        padding-left: 1rem;
    }

    .about_content {
        margin-top: 0;
        padding: 0 2rem;
    }

    .about_bigtitle {
        font-size: 2rem;
    }

    .about_text {
        font-size: 1rem;
    }

    .course {
        width: 100%;
        margin-bottom: 3rem;
        padding: 0 1rem;
    }

    .course_photo {
        width: 100%;
    }

    .course_name {
        font-size: 2rem;
    }

    .course_cat {
        font-size: 1rem;
    }

    .course_text {
        font-size: 1rem;
        margin-bottom: -1rem;
    }

    .course_link {
        font-size: 1.1rem;
    }
}

@media(max-width: 767px)
{
    .user {
        display: none;
    }

    .nav {
        display: flex;
        justify-content: space-around;
        width: 100%;

        border-bottom: 1px solid black;
        padding-bottom: 1rem;
    }

    .nav_link {
        margin: 0;
    }

    .intro_title {
        font-size: 2.2rem;
    }

    .text_center {
        margin: 1rem auto;
    }

    .work_cat {
        font-size: 0.7rem;
    }

    .work_title {
        font-size: 0.9rem;
    }

    .works {
        margin-bottom: 2rem;
    }

    .about_inner {
        display: flex;
        flex-wrap: wrap;
        justify-content: center;
    }

    .about_photo {
        min-width: 100%;
        margin: 0;
        padding: 0;
        height: 100%;
    }

    .about_content {
        margin-top: 3rem;
        width: 100%;
        padding: o 1rem;
    }

    .courses {
        margin-bottom: 2rem;
    }

    .course_name{
        font-size: 1rem;
    }

    .course_cat {
        font-size: 0.8rem;
    }

    .footer_copyright {
        font-size: 0.8rem;
    }

    .footer_nav {
        display: none;
    } 
}