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

:root{
    --color-primary: #6c63ff;
    --color-success: #00bf8e;
    --color-warning: #f7c94b;
    --color-danger: #f75842;
    --color-danger-variant: rgba(247, 88, 0.4);
    --color-white: #fff;
    --color-light: rgba(255, 255, 255,0.7);
    --color-black: #000;
    --color-bg: #1f2641;
    --color-bg1: #2e3267;
    --color-bg2: #2e3267;
    --color-bg3: #424890;
    
    --container-width-lg: 80%;
    --container-width-nd: 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: 1.3rem;
    margin-top: 30px;
}

br{
    font: 1.3rem;
    margin-top: 30px;
    color: yellow; 
}

a{
    color: var(--color-white);
}
img{
    width: 100%;
    display: block;
    object-fit: cover;
}

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

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

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

/*NAVBAR*/

nav{
    background: transparent;
    width: 100vw;
    height: 5rem;
    position: fixed;
    top: 0;
    z-index: 11;
}

/* change navbar styles on scroll using javascript*/
.window-scroll {
    background: var(--color-primary);
    box-shadow: 0 1rem 2rem rgba(0, 0, 0, 0.2);
}

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

}

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: 70vh;
    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;
    margin-left: 0rem;
}

/*CATEGOIRES*/

.categories{
    background: var(--color-bg1);
    height: 45rem;

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

.categories__container{
    display: grid;
    grid-template-columns:40% 60% ;

}
.categories__left{
    margin: 4rem;
}
.categories__left p{
    margin: 1rem 0 3rem;
}
.categories__right{
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 1.2rem;
}

.category{
    background: var(--color-bg3);
    padding: 2rem;
    border-radius: 2rem;
    transition: var(--transition);
}

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

/* ICON COLOR CHANGER */
.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 COURSES*/
.courses{
    margin-top:5rem ;
}
.courses__container{
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 3rem;
}

.course {
    background:var(--color-bg1);
    text-align: center;
    border: 1px solid transparent;
    transition:var(--transition) ;
}
.course:hover{
    background: transparent;
    border: var(--color-primary);
}
.course__info{
    padding: 2rem;
}
.course__info P{
    margin: 1.2rem 0 2rem;
    font-size: 0.9rem;
}

/*FRQUENCY ASKED QUESYION*/

.faqs{
    background: var(--color-bg1);
    box-shadow: inset 0 0 3rem rgba(0, 0, 0, 0.3);
}

.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: 1rem;

}
.faq__icon{
    align-items: flex-start;
    font-size: 1.2rem;
}

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



/*TESTIMONIAL*/

.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: 50%;
    top: -1.5rem;
    transform: rotate(45deg);
}


/*FOOTER CLASS*/

footer{
    background: var(--color-bg1);
    padding-top:5rem ;
    font-size: 1rem;
}

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

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

.footer__1 p{
    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: 4rem;
    padding: 1.2rem 0;
    border-top: 1px solid var(--color-bg2);
}


/*   MEDIA QUERIES TABLET*/

@media screen and (max-width: 1024px) {
    .container {
        width: var(--container-width-nd);
    }
    h1{
        font-size: 2.2rem;
    }
    h2{
        font-size: 1.7rem;
    }
    h3{
        font-size: 1.4rem;
    }
    h4{
        font-size: 1.2rem;
    }

    /*NAVABAR*/

    nav button{
        display: inline-block;
        background: transparent;
        font-size: 1.8rem;
        color: var(--color-white);
        cursor: pointer;
    }
    nav button#close-menu-btn{
        display: none;
    }

    .nav__menu{
        position: fixed;
        top: 5rem;
        right: 5%;
        height: fit-content;
        width: 18rem;
        flex-direction: column;
        gap: 0;
        display: none;
    }
    
    .nav__menu li{
        width: 100%;
        height: 5.0rem;
        animation: animateNavItems 400ms 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: 400ms;
    }

    .nav__menu li:nth-child(4){
        animation-delay: 600ms;
    }

    @keyframes animateNavItems{
        0%{
            transform: rotateZ(-90deg) scale(0.1);
        }
        100%{
            transform: rotateZ(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: 4rem;
}

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


/*    CATEGORIES*/

.categories{
    height: auto;
}

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

.categories__left{
    margin-left: 0;
}

/*    POPULAR COURSES*/

.courses{
    margin-top: 0;
}
.courses__container{
    grid-template-columns: 1fr 1fr;
}


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

.faq{
    padding: 1.5rem;
}

/*    FOOTERS*/

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

}

/*   MEDIA MOBILE PHONE*/

@media screen and (max-width: 600px){
    .container{
        width: var(--container-width-sm);
    }

    /*NAVABAR*/

    .nav__menu{
        right: 3%;
    }

    /*HEADER*/
    header{
        height: 100vh;
    }
    
    .header__container{
        grid-template-columns: 1fr;
        text-align:center ;
        margin: 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;
    }

    /*POPULAR COUSRSES*/

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

    /*TEASTIMONIAL*/

    .testimonial__body{
        padding: 1.2rem;
    }

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

    .footer__1{
        margin: 1rem auto;
    }
    
    .footer__socials{
        justify-content: center;
    }
}