* {
  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: #f07565;
  --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;
}

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

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

/*----changing the color of the navbar upon scrolling 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: 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;
}

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

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

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

.categories__left {
  margin-right: 2rem;
}

.categories__left p {
  margin: 1rem 0 3rem;
}

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

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

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

.catogory:nth-child(2) .catogory__icon {
  background: var(--color-danger);
}

.catogory:nth-child(3) .catogory__icon {
  background: var(--color-success);
}

.catogory:nth-child(4) .catogory__icon {
  background: var(--color-warning);
}

.catogory:nth-child(5) .catogory__icon {
  background: var(--color-success);
}

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

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

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

/*===============  POPULAR 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;
  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  ==========*/
.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: 2.2;
}

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

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

.faq.open p {
  display: block;
}

/*===============  TESTIMONIAL SECTION  ==========*/

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

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

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

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

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

.footer__socials {
  display: inline-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 QUARIES FOR THE TABLET SCREEN ===============*/
@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;
  }

/* ======================HIDING OF THE 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(0deg) rotateX(0deg) 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;
}

/* ====================== CATOGERIES ================== */
.categories{
  height: auto;
}

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

.categories__left{
  margin-right: 0;
}


/* ====================== POPULAR COURSES ================== */
.course{
  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 (PHONE) ================== */
@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 ================== */
.catogeries__right{
  grid-template-columns: 1fr 1fr;
  gap: 0.7rem;
}

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

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

.categories__left p{
  text-align: center;
}

.categories__left h1{
  text-align: center;
}

/* ====================== POPULAR 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;
}

}