*{
    margin: 0;
    padding: 0;
    border: 0;
    outline: 0;
    text-decoration: none;
    box-sizing: border-box;
    list-style: none;
}

:root{
    --color-primary:#6c63ff;
    --color-success:#00bf8e;
    --color-warning:#f7c94b;
    --color-danger:#f75842;
    --color-danger-variant:rgba(255, 88, 66, 0.4);
    --color-white:#fff;
    --color-light:rgba(255, 255, 255, 0.7);
    --color-black:#000;
    --color-bg:#1f2641;
    --color-bg1:#2e3267;
    --color-bg2:#424890;

    --container-width-lg:80%;
    --container-width-md:90%;
    --container-width-sm:94%;
    
    --transition: all 400ms ease;
}

body{
    font-family: "Montserrat", sans-serif;
    line-height:1.7;
    color:var(--color-white);
    background:var(--color-bg);
}

.container{
    width:var(--container-width-lg);
    margin:0 auto;
}

section{
    padding:6rem 0;
}

section h2{
    text-align: center;
    margin-bottom:4rem;
}

h1, h2,h3,h4,h5{
    line-height: 1.2;
}

h1{
    font-size: 2.4rem;
}

h2{
    font-size: 2rem;
}

h3{
    font-size: 1.6rem;
}

h4{
    font-size: 1.3rem;
}

a{
    color: var(--color-white);
}

img {
    width:100%;
    display:block;
    object-fit: cover;
}

.btn{
    display:inline-block;
    background-color: var(--color-white);
    color: var(--color-black);
    padding: 1rem 2rem;
    border: 1px solid transparent;
    font-weight: 500;
}

.btn:hover{
    background: transparent;
    color: var(--color-white);
    border-color: var(--color-white);
}

.btn-primary{
    background-color: var(--color-danger);
    color: var(--color-white);
}

/*============= NAVBAR =============*/

nav{
    background: transparent;
    width:100vw;
    height:4.5rem;
    position:fixed;
    top: 0;
    z-index: 11;
}

/*change nav bar color while scrolling this is connect
to js*/

.window-scroll{
    background: var(--color-primary);
    box-shadow: 0 1rem 2rem rgba(0,0,0,0.2);
    transition: all 800ms ease;
}

.nav__container{
    height: 100%;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

nav button{
    display: none;
}

.nav__menu{
    display: flex;
    align-items: center;
    gap: 4rem;
}

.nav__menu a{
    font-size:0.9rem;
    transition:var(--transition);
}

.nav__menu a:hover{
    color: var(--color-bg2);
}
/*============= HEADER =============*/

header{
    position:relative;
    top: 5rem;
    overflow: hidden;
    height:80vh;
    margin-bottom:5rem;
}

.header_container{
    display: grid;
    grid-template-columns: 1fr 1fr;
    align-items: center;
    gap: 5rem;
    height: 100%;
}

.header_left p{
    margin: 1rem 0 2.4rem;
}

/*============= Categories =============*/
.categories {
    background: var(--color-bg1);
    height: 29rem;
}

.categories h1 {
   line-height: 1;
    margin-bottom: 3rem;
}

.categories__container {
    display: grid;
    grid-template-columns: 40% 60%;
    /*gap: 4rem;*/
}

.categories__left p {
    margin-bottom: 3.7rem;
    margin-right: 6rem; 
}

.categories__right{
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 1.2rem;
}

.category{
    background: var(--color-bg2);
    padding: 2rem;
    border-radius: 2rem;
    transition: var(--transition);
}

.category:hover{
    box-shadow: 0 3rem 3rem rgba(0,0,0,0.3);
    z-index: 1;
}

.category:nth-child(2) .category__icon{
    background: var(--color-danger);
}

.category:nth-child(3) .category__icon{
    background: var(--color-success);
}

.category:nth-child(4) .category__icon{
    background: var(--color-warning);
}

.category:nth-child(5) .category__icon{
    background: var(--color-success);
}

.category__icon{
    background: var(--color-primary);
    padding: 0.7rem;
    border-radius:0.9rem;
}

.category h5{
    margin: 2rem 0 1rem; 
}

.category p{
    font-size:0.85rem;
}


/*============= POPULAR COURSE =============*/

.courses{
    margin-top: 10rem;
}

.courses__container{
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 2rem;
}

.course{
    background: var(--color-bg1);
    text-align: center;
    border: 1px solid transparent;
    transition: var(--transition);
}

.course:hover{
    background: transparent;
    border-color: var(--color-primary);
}

.course__info{
    padding: 2rem;
}

.course__info p{
    margin: 1.2rem 0 2rem;
    font-size:0.9rem;
}

.course__image{
    border-radius: 20rem;
    padding: 0.5rem 0.5rem 0 0.5rem;
}

/*============= FAQs =============*/
.faqs{
    background:var(--color-bg);
    box-shadow: inset 0 0 3rem rgba(0,0,0,0.5);
}

.faqs__container{
    display: grid;
    grid-template-columns:1fr 1fr;
    gap: 1rem;
}

.faq{
    padding: 2rem;
    display: flex;
    align-items: center;
    gap: 1.4rem;
    height: fit-content;
    background: var(--color-primary);
    cursor: pointer;
}

.faq h4{
    font-size:1rem;
    line-height: 2.2;
}

.faq__icons{
    align-self: flex-start;
    font-size: 1.2rem;
}

.faq p{
    margin-top: 0.8rem;
    display: none;
}

.faq.open p{
    display: block;
}

/*=============TESTIMONIALS=============*/

.testimonials__container{
    overflow-x:hidden;
    position: relative;
    margin-bottom: 5rem;
}

.testimonial {
    padding-top: 2rem;
}

.avatar {
    width: 6rem;
    height: 6rem;
    border-radius: 50%;
    overflow: hidden;
    margin: 0 auto 1rem;
    border: 1rem solid var(--color-bg1);
}

.testimonial__info{
    text-align: center;
}

.testimonial__body{
    background: var(--color-primary);
    padding: 2rem;
    margin-top: 3rem;
    position: relative;
}

.testimonial__body::before{
    content: "";
    display: block;
    background: linear-gradient(
    135deg,
    transparent,
     var(--color-primary),
     var(--color-primary),
     var(--color-primary));
    width: 3rem;
    height: 3rem;
    position: absolute;
    left: 47%;
    top:-1.5rem;
    transform:rotate(45deg);
}

/*============= FOOTER =============*/
footer{
    background: var(--color-bg1);
    padding-top: 5rem;
    font-size: 0.9rem;
}

.footer__container{
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 5rem;
}

.footer__container > div h4{
    margin-bottom:1.2rem;
}

.footer__1 p{
    margin:0 0 2rem;
}

footer ul li{
    margin-bottom:0,7rem;
}

footer ul li a:hover{
    text-decoration: underline;
}

.footer__socials{
    display:flex;
    gap: 1rem;
    font-size: 1.2rem;
    margin-top: 2rem;
}

.footer__copyright{
    text-align: center;
    margin-top: 2rem;
    padding: 1.2rem 0;
    border-top: 1px solid var(--color-bg2);
}

/*============= MEDIA QUERIES(TABLETS) =============*/

@media screen and (max-width: 1024px){
    
    .container{
        width: var(--container-width-md);
    }

    h1{
        font-size: 2.2rem;;
    }

    h2{
        font-size: 1.7rem;
    }

    h3{
        font-size: 1.4rem;
    }

    h4{
        font-size: 1.2rem;
    }


    /*============= NAVBAR =============*/

    nav button{
        display: inline-block;
        background: transparent;
        font-size: 1.5rem;
        color: var(--color-white);
        cursor: pointer;
    }

    nav button#close-menu-btn{
        display: none;
    }

    .nav__menu{
        position: fixed;
        top: 5rem;
        right: 5%;
        width: 17rem;
        height: fit-content;
        flex-direction: column;
        gap: 0;
        display: none;
    }

    .nav__menu li{
        width: 100%;
        height: 5.7rem;
        animation: animateNavItems 200ms linear forwards;
        transform-origin: top right;
        opacity: 0;
    }

    .nav__menu li:nth-child(2){
        animation-delay: 200ms;
    }

    .nav__menu li:nth-child(3){
        animation-delay: 300ms;
    }

    .nav__menu li:nth-child(4){
        animation-delay: 400ms;
    }

    @keyframes animateNavItems{
        0%{
            transform: rotateZ(-90deg) rotateX(90deg) scale(0.1);
        }
        100%{
            transform: rotateZ(0deg) rotateX(0) scale(1);
            opacity: 1;
        }
    }

    .nav__menu li a{
        background: var(--color-primary);
        box-shadow: -4rem 6rem 10rem rgba(0,0,0,0.6);
        width: 100%;
        height: 100%;
        display: grid;
        place-items: center;
    }

    .nav__menu li a:hover{
        background: var(--color-bg2);
        color: var(--color-white);
    }

    /*============= HEADER =============*/

    header{
        height: 52vh;
        margin-bottom: 3rem;
    }

    .header_container{
        gap: 0;
        padding-bottom: 3rem;
    }

    /*============= CATEGORIES =============*/

    .categories{
        height: auto;
    }

    .categories__container{
        grid-template-columns: 1fr;
        gap: 3rem;
    }

    .categories__left{
        margin-right: 0;
    }

    /*============= COURSES =============*/

    .courses{
        margin-top: 0rem;

    }
    
    .courses__container{
        grid-template-columns: 1fr 1fr;
    }

    /*============= FAQs =============*/

    .faqs__container{
        grid-template-columns: 1fr;
    }

    .faq{
        padding: 1.5rem;
    }

    /*============= FOOTER =============*/

    .footer__container{
        grid-template-columns: 1fr 1fr;
        margin-left: 2.5rem;
    }

}

/*============= MEDIA QUERIES(MOBILE) =============*/
@media screen and (max-width:600px){
    .container{
        width: var(--container-width-sm);
    }

    /*============= NAVBAR =============*/
    .nav__menu{
        right: 3%;
    }

    /*============= HEADER =============*/
    header{
        height: 100vh;
    }

    .header_container{
        grid-template-columns: 1fr;
        text-align: center;
        margin-top: 0;  
    }

    .header_left p{
        margin-bottom: 1.3rem;
    }
    
    /*============= CATEGORIES =============*/
    .categories__right{
        grid-template-columns: 1fr 1fr;
        gap: 0.7rem;
    }

    .category{
        padding:1rem;
        border-radius: 1rem;
    }
    .category__icon{
        margin-top: 4px;
        display: inline-block;
    }

    /*============= COURSES =============*/
    .courses__container{
        grid-template-columns: 1fr;
    }

    /*============= TESTIOMINAL =============*/
    
    .testimonial__body{
        padding: 1.2rem;
    }

    /*============= FOOTER =============*/
    .footer__container{
        grid-template-columns: 1fr;
        text-align: center;
        gap: 2rem;
        margin: 1rem ;
    }

    .footer__1 p{
        margin: 1rem auto;
    }

    .footer__socials{
        justify-content: center;    
    }

}