*{
    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, 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;
}

.fact_img {
    width:  400px;
    height: 300px;
}

.btn{
    display: inline-block;
    background: 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: var(--color-danger);
    color: var(--color-white);
}

.btn-sm {
    background: var(--color-danger);
    color: var(--color-white);
    margin-bottom: 1rem;
}

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

.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: 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{
    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;
}


.categories {
    background: var(--color-bg1);
    height: 55rem;
}

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

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

.categories_left{
    margin-right: 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-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;
}

 .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;
 }

 .faqs {
    background: var(--color-bg1) ;
    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: 2.2rem;
 }

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

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

.faq.open p{
    display: block;
}



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

@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;
    }


    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: 5.8rem;
        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') rotateX('90deg') scale(1);
        }

        100% {
            transform: rotateZ('0');
            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{
        height: 52vh;
        margin-bottom: 4rem;
    }

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

    .categories{
        height: auto;
    }

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

    .categories_left{
        margin-right: 0;
    }

    .courses{
        margin-top: 0;
    }

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

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

    .faq{
        padding: 1.5rem;
    }

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

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

    .nav_menu {
        right: 3%;
    }

    header {
        height: 100vh;
    }

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

    .header_left p {
        margin-bottom: 1.3rem;
    }

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

    .testimonial_body {
        padding: 1.2rem;
    }

    .footer_container {
        grid-template-columns: 1fr;
        text-align: center;
        gap: 2rem;
    }

    .footer_1 p {
        margin: 1rem auto;
    }

    .footer_socials {
        justify-content: center;
    }
}