* {
  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: #A300FF;
  --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: white;
  --color-bh1: #2e3267;
  --color-bg2: #424890;

  --container-width-lg: 76%;
  --container-width-md: 90%;
  --container-width-sm: 94%;

  --transition: all 400ms ease;
}

body {
  font-family: 'Noto Sans KR', sans-serif;
  line-height: 1.7;
  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: 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-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-danger);
}

.btn-primary {
  background: var(--color-danger);
  color: var(--color-white);
  border-radius: 20px;
}

/*----navbar------*/

nav{
  background: transparent;
  width: 100vw;
  height: 7rem;
  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: center;
  margin-top: 10px;
}

.nav button{
  display: none;
}

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

.nav__menu a {
  font-size: 1.5rem;
  transition: var(--transition);
}

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

/*header*/

header {
  position: relative;
  overflow: hidden;
  height: 80vh;
  margin-bottom: 3rem;
  background-image: url(/image/mainheader.png)

}

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

.header__container p {
  font-size: 5rem;
  color: white;
}

.header__left h1 {
  margin-top: 5rem;
  line-height: 3rem;
  color: white;
}

.header__left h2{
  margin: 1rem 0 2rem;
  line-height: 1rem;
  color: white;
}

.header__right-image {
  position: flex;
  margin-top: 200px;
}

/*애플 삼성 로고*/

.logoimages {
  position: flex;
  display: block;
  border: 100px;
  width: 30rem;
  margin-top: -20px;
  margin-bottom: -20px;
}

/*categories*/

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

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

.categories__container {
  display: grid;
  grid-template-columns: 50% 50%;
}

.categories__left h1{
  line-height:4rem;
}

.categories__left {
  margin-left: 2rem;
}

.categories__left p {
  margin: 1rem 0 3rem;
  margin-right: 5rem;
  font-size:1.5rem;
  letter-spacing:2px;
  line-height:2rem;
  
}

.categories__right {
  overflow: hidden;
  position: relative;
  /*display: grid;
  grid-template-columns:repeat(3, 1fr);
  gap: 1.2rem;*/
}
.category {
  background-color: var(--color-bg2);
  padding: 2rem;
  border-radius: 2rem;
  transition: var(--transition);
}

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

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

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

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



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

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

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

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

/*start of couses*/

.courses {
  margin-top: 8rem;
}

.course h3 {
  color: white;
}

.courses__container {
  display: grid;
  grid-template-columns: repeat(2, 400px);
  gap: 10rem;
  align-items: center;
  justify-content:center;
}

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


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

.course__info {
  padding: 2rem;
  background-color: var(--color-primary);
  border-radius: 20px;
}

.course__info p {
  margin: 1.2rem 0 2rem;
  font-size:1.5rem;
  color: white;
}

/*costs*/

.costs {
  background-image: url(/image/item3.png);
  width: 100%;
  height: 100%;
}

.costs h2  {
  color: white;
}

.costs h4 {
  color: white;
  text-align: center;
  margin-top:3rem;
}

.costs__container {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 10rem;
  align-items: center;
  justify-content:center;
}

.costs__info {
  padding: 2rem;
  border-radius: 5px;
  background-color: white;
}

.costs__info p {
  margin: 1.2rem 0 2rem;
  font-size:1.5rem;
}




/*faqs*/

.faqs {
  background-color: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;
  color: white;
}

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

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

.faq.open p {
  display: block;
}

/*testimonials*/

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

.testimonial {
  padding-top:2rem;
}

.avator {
  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;
  color: white;
}
/*네모박스위에 삼각형 그래디언트 넣어 만들기*/
.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);
}
/*contact*/
/*
section.contact {
  background: url(../images/) no-repeat center center/cover;
  padding: 0;
  max-width: 100vw;
}*/
section.contact .overlay {
  width: 100%;
  height: 100%;
  background: #000C92;
  padding: 5rem 0 7rem;
}

section.contact .container {
  width: 40%;
}

section.contact .container h1  {
  margin: 0;
  color: var(--color-white);
}

section.contact .container h3 {
  text-align: center;
  color: var(--color-white);
  opacity:0.8;
  margin-top: 0.5rem;
}

section.contact form {
  margin-top: 3rem;
}

section.contact form input, section.contact form textarea {
  display:block;
  width:100%;
  margin: 0.5rem, 0;
  padding: 1rem;
  border: 1px solid var(--color-white);
  background: transparent;
  color: var(--color-white);
  transition:var(--transition);
}

section.contact form textarea {
  height: 10rem;
}

section.contact form input:focus, section.contact form textarea:focus {
  background: var(--color-white);
  color: var(--color-black);
}

section.contact form input:placeholder, section.contact form textarea:placeholder {
  color: var(--color-white);
} 

section.contact form .btn {
  width: 14rem;
  border: none;
  background: var(--color-white);
  color: var(--color-black);
  margin: 2rem auto 0;
}

section.contact form .btn:hover {
  background: var(--color-primary);
  cursor: pointer;
  color: var(--color-white);
}



/*footer*/

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;
  color: black;
}

.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 query for tablet*/

@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: 300ms;
  }
  .nav__menu li :nth-child(4) {
    animation-delay: 400ms;
  }

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

  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;
  }

  /*category*/

  .categories {
    height: auto;
  }

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

  .categories__left {
    margin-left: 0;
  }

  /*popular courses*/

  .course {
    margin-top: 0;
  }

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

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

  .faq {
    padding: 1.5rem;
  }

  /*footer*/
  .categories__container{
    grid-template-columns: 1fr 1fr;
  }
}

/*media query phones*/

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

  /*navbar*/
  .nav__menu{
    right: 3px;
  }

  /*header*/
  header{
    height: 110vh;
  }

  .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;
  }

  .categories__left{
    margin: 10px;
  }

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

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


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

  /*testimodia*/
  .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;
  }
}