@media(max-width: 991px){
    .portfolio-section .portfolio-item,
    .service-section .service-item{
        flex: 0 0 50%;
        max-width: 50%;
    }
}

@media(max-width: 767px){
    .contact-section .w-50,
    .contact-section .contact-item,
    .portfolio-popup .description,
    .portfolio-popup .info,
    .portfolio-section .portfolio-item,
    .service-section .service-item,
    .about-section .skills .skill-item,
    .about-section .about-info,
    .about-section .about-img,
    .home-section .home-text,
    .home-section .home-img{
        flex: 0 0 100%;
        max-width: 100%;
    }
    .home-section .home-text{
        order: 2;
    }
    .contact-section .submit-btn,
    .home-section .home-text{
        text-align: center;
    }
    .home-section .full-screen{
        padding: 100px 0;
    }
    .home-section .home-img .img-box{
        margin-bottom: 40px;
        max-width: 350px;
    }
    .effect-3{
        margin-left: -60px;
    }
    .effect-4{
        left: 15%;
    }
    .effect-5{
        right: 4%;
    }
    .about-section .about-img{
        padding-bottom: 30px;
    }
    .about-section .timeline .timeline-item:nth-child(odd){
        padding-right: 15px;
        text-align: left;
        padding-left: 75px;
    }
    .about-section .timeline .timeline-item:nth-child(even){
        padding-left: 75px;
    }
    .about-section .timeline::before{
        left: 35px;
    }
    .about-section .timeline .timeline-item:nth-child(odd) .icon{
        right: auto;
        left: -60px;
    }
    .about-section .timeline .timeline-item:nth-child(even) .icon{
        left: -60px;
    }
    .about-section .timeline .timeline-item{
        margin-bottom: 40px;
    }
    .about-section .timeline .timeline-item:last-child{
        margin-bottom:0;
    }
    .about-section .timeline .timeline-item:nth-child(odd) .timeline-item-inner:before{
        left: -30px;
        right: auto;
    }

     /*------------ navigation menu ---------------- */

.nav-menu{
    position: fixed;
    background-color: var(--bg-black-50);
    padding: 0 15px;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    z-index: -1;
    opacity: 0;
    visibility: hidden;
    overflow-y: auto;
}
.fade-out-effect{
    position: fixed;
    left: 0;
    top: 0  ;
    width: 100%;
    height: 100%;
    background-color: var(--bg-black-50);
    z-index: -1;
    visibility: hidden;
}
.fade-out-effect.active{
    visibility: visible;
    z-index: 1000;
    animation: fadeOut 0.3s ease-out;
}
@keyframes fadeOut{
    0%{
        opacity: 1;
    }
    100%{
        opacity: 0;
    }
}
.nav-menu.open{
    visibility: visible;
    opacity: 1;
    z-index: 1000;
    transition: all 0.3s ease-in;
}
.nav-menu .close-nav-menu{
    height: 40px;
    width: 40px;
    display: block;
    font-size: 35px;
    line-height: 35px;
    border-radius: 50%;
    position: absolute;
    right: 15px;
    top: 15px;
    cursor: pointer;
    text-align: center;
    color: var(--text-black-600);
    transition: all 0.3s ease;
    visibility: visible;
}
.nav-menu .close-nav-menu:after{
    border-radius: 50%;
}
.nav-menu-inner{
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
}
.nav-menu ul{
    padding: 15px;
}
.nav-menu ul li{
    display: block;
    margin-bottom: 20px;
    text-align: center;
}
.nav-menu ul li:last-child{
    margin-bottom: 0;
}
.nav-menu ul li a{
    display: inline-block;
    font-size: 28px;
    font-weight: 600;
    color: var(--text-black-600);
    padding: 5px 30px;
    text-transform: capitalize;
    border-radius: 30px;
    transition: all 0.3s ease;
}
.nav-menu ul li a.active{
    color: var(--skin-color);
}
.nav-menu ul li a:after{
    border-radius: 30px;
}
.nav-menu .copyright-text{
    position: absolute;
    visibility: visible;
    left: -30px;
    top: 50%;
    font-size: 15px;
    color: var(--text-black-600);
    transform: translateY(-50%) rotate(-90deg);
}
/* -------------
Header
----------------*/
.header{
    background-color: transparent;
    padding: 20px 15px;
    position: absolute;
    width: 100%;
    top: 0;
    left: 0;
    z-index: 99;
}
.header .logo a{
    display: inherit;
    text-align: center;
    line-height: 36px;
    height: 40px;
    width: 40px;
    font-size: 20px;
    color: var(--skin-color);
    border-radius: 30%;
    border: 2px solid var(--skin-color);
    font-weight: 600;
    text-transform: uppercase;
}
.header .hamburger-btn{
    height: 40px;
    width: 40px;
    display:flex;
    align-items: center;
    cursor: pointer;
    border-radius: 50%;
    justify-content: center;
    transition: all 0.3s ease;
    visibility: visible;
}
.header .hamburger-btn:after{
    border-radius: 50%;
}
.header .hamburger-btn span{
    display: block;
    height: 2px;
    width: 16px;
    background-color: var(--bg-black-900);
    position: relative;
}
.header .hamburger-btn span:before,
.header .hamburger-btn span:after{
    content:'';
    position: absolute;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: var(--bg-black-900);
}
.header .hamburger-btn span:before{
    top:-6px;
}
.header .hamburger-btn span:after{
    top:6px;
}

}
@media(max-width: 574px){
    .home-section .home-img .img-box{
        max-width: 260px;
    }
    .home-section .home-text h2{
        font-size: 40px;
    }
    /*------------ navigation menu ---------------- */

.nav-menu{
    position: fixed;
    background-color: var(--bg-black-50);
    padding: 0 15px;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    z-index: -1;
    opacity: 0;
    visibility: hidden;
    overflow-y: auto;
}
.fade-out-effect{
    position: fixed;
    left: 0;
    top: 0  ;
    width: 100%;
    height: 100%;
    background-color: var(--bg-black-50);
    z-index: -1;
    visibility: hidden;
}
.fade-out-effect.active{
    visibility: visible;
    z-index: 1000;
    animation: fadeOut 0.3s ease-out;
}
@keyframes fadeOut{
    0%{
        opacity: 1;
    }
    100%{
        opacity: 0;
    }
}
.nav-menu.open{
    visibility: visible;
    opacity: 1;
    z-index: 1000;
    transition: all 0.3s ease-in;
}
.nav-menu .close-nav-menu{
    height: 40px;
    width: 40px;
    display: block;
    font-size: 35px;
    line-height: 35px;
    border-radius: 50%;
    position: absolute;
    right: 15px;
    top: 15px;
    cursor: pointer;
    text-align: center;
    color: var(--text-black-600);
    transition: all 0.3s ease;
    visibility: visible;
}
.nav-menu .close-nav-menu:after{
    border-radius: 50%;
}
.nav-menu-inner{
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
}
.nav-menu ul{
    padding: 15px;
}
.nav-menu ul li{
    display: block;
    margin-bottom: 20px;
    text-align: center;
}
.nav-menu ul li:last-child{
    margin-bottom: 0;
}
.nav-menu ul li a{
    display: inline-block;
    font-size: 28px;
    font-weight: 600;
    color: var(--text-black-600);
    padding: 5px 30px;
    text-transform: capitalize;
    border-radius: 30px;
    transition: all 0.3s ease;
}
.nav-menu ul li a.active{
    color: var(--skin-color);
}
.nav-menu ul li a:after{
    border-radius: 30px;
}
.nav-menu .copyright-text{
    position: absolute;
    visibility: visible;
    left: -30px;
    top: 50%;
    font-size: 15px;
    color: var(--text-black-600);
    transform: translateY(-50%) rotate(-90deg);
}
/* -------------
Header
----------------*/
.header{
    background-color: transparent;
    padding: 20px 15px;
    position: absolute;
    width: 100%;
    top: 0;
    left: 0;
    z-index: 99;
}
.header .logo a{
    display: inherit;
    text-align: center;
    line-height: 36px;
    height: 40px;
    width: 40px;
    font-size: 20px;
    color: var(--skin-color);
    border-radius: 30%;
    border: 2px solid var(--skin-color);
    font-weight: 600;
    text-transform: uppercase;
}
.header .hamburger-btn{
    height: 40px;
    width: 40px;
    display:flex;
    align-items: center;
    cursor: pointer;
    border-radius: 50%;
    justify-content: center;
    transition: all 0.3s ease;
    visibility: visible;
}
.header .hamburger-btn:after{
    border-radius: 50%;
}
.header .hamburger-btn span{
    display: block;
    height: 2px;
    width: 16px;
    background-color: var(--bg-black-900);
    position: relative;
}
.header .hamburger-btn span:before,
.header .hamburger-btn span:after{
    content:'';
    position: absolute;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: var(--bg-black-900);
}
.header .hamburger-btn span:before{
    top:-6px;
}
.header .hamburger-btn span:after{
    top:6px;
}



}