* {
    margin: 0px;
    padding: 0;
    border: 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: 76%;
    --container-width-md: 90%;
    --container-width-sm: 94%;

    --transition: all 1s 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 50%;
}

#killudada {
    width: 60%;
}

.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;

}

/* changing navbar scrolling style 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: 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: 4rem;
    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 */

.categories {
    background: var(--color-bg1);
    height: 32rem;
}

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

.categories-container {
    display: grid;
    grid-template-columns: 40% 60%;
    gap: 1.2rem;
}

.categories-left {
    margin-right: 4rem;
}

.categories-left p {
    margin: 3rem 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: .6rem .6rem .6rem .6rem rgba(180, 21, 21, 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: 0.7rem;

}

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

.category p {
    font-size: 0.85rem;

}

/* COURSES */


.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;
}

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

.course-info {
    padding: 2rem;

}

#course-1 {

    height: 20rem;

}

#course-2 {
    height: 20rem;

}

#course-3 {
    height: 20rem;
}

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

/* FAQs styling */


.faqs {
    background: var(--color-bg1);
    box-shadow: 0 0 3rem rgba(0, 0, 0, 0.5);
}

.faqs-container {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 2rem;
}

.faq {
    padding: 2rem;
    align-items: center;
    display: flex;
    gap: 1.4rem;
    height: fit-content;
    background: var(--color-primary);
    cursor: pointer;
    border-radius: .5rem;
}

.faq h4 {
    font-size: 1rem;
    height: 2.1rem;
}

.faqs-icon {
    align-self: flex-start;
    font-size: 1.2rem;
    position: relative;
    bottom: 5.5px;

}

.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;
    border-radius: .5rem;
    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: 48%;
    top: -1.5rem;
    transform: rotate(45deg);
}

/* FOOTER */

footer{
    background: var(--color-bg1);
    padding-top: 5rem;
    font-size: .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 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: 1.8rem;
    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(0.1);

    }
    
    100%{
        transform: rotateZ(-0) 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: 4rem;
    
}

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

/* CATEGORIES */

.categories {
    height: auto;
}

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

.categories-left {
    margin-right: 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;
   
}

/* FOOTER */

.footer-container{
    grid-template-columns: 1fr 1fr;
}

}

/* MEDIA QUERIES (MOBILES) */

@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: 1rem;
}

.header-left p {
    margin-bottom: 1.3rem;
}

/* CATEGORIES */
.categories-right {
    grid-template-columns: 1fr 1fr;
    gap: 0.8rem;
}

.category {
    padding: 1rem;
    border-radius: 1rem;
}

.category-icon {
    margin-top: 4px;
    display: inline-block
}   

/* COURSES */

.courses-container {
    grid-template-columns: 1fr;
}

/* TESTIMONIALS */
.testimonial-body {
    padding: 1.2rem;
}

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

.footer-1 p {
margin: 1rem auto;
}

.footer-socials {
   justify-content: center;
  
}
    

}