* {
  margin: 0;
  padding: 0;
}

.header {
  position: fixed;
  width: 100%;
  background-color: #FBFBFB;
  display: -webkit-box;
  display: -ms-flexbox;
  display: flex;
  -webkit-box-align: center;
      -ms-flex-align: center;
          align-items: center;
  height: 80px;
  -webkit-box-pack: justify;
      -ms-flex-pack: justify;
          justify-content: space-between;
  z-index: 9;
  -webkit-transition: background-color 0.3s ease-in-out;
  transition: background-color 0.3s ease-in-out;
  overflow: hidden;
}
.header.scrolled {
  background-color: rgba(239, 239, 239, 0.9);
  -webkit-box-shadow: 0 4px 10px rgba(0, 0, 0, 0.1);
          box-shadow: 0 4px 10px rgba(0, 0, 0, 0.1);
}

#logo {
  -ms-flex-negative: 0;
      flex-shrink: 0;
}

#logo img {
  width: 11vw;
  height: auto;
}

#desktop-menu {
  display: -webkit-box;
  display: -ms-flexbox;
  display: flex;
  list-style: none;
  margin: 0;
  padding: 0;
}

#desktop-menu ul {
  display: -webkit-box;
  display: -ms-flexbox;
  display: flex;
}

#desktop-menu ul li {
  padding: 29px 30px;
  -webkit-transition: background-color 0.3s;
  transition: background-color 0.3s;
  list-style: none;
}

#desktop-menu ul li a {
  font-family: "PT Sans", sans-serif;
  color: #000;
  text-decoration: none;
  font-size: 16px;
  text-align: center;
}

#desktop-menu ul li:hover {
  background-color: #D9D9D9;
}

#desktop-menu ul li:hover a {
  color: #000;
}

.menu-toggle {
  display: none;
  -webkit-box-orient: vertical;
  -webkit-box-direction: normal;
      -ms-flex-direction: column;
          flex-direction: column;
  -webkit-box-pack: justify;
      -ms-flex-pack: justify;
          justify-content: space-between;
  width: 30px;
  height: 25px;
  cursor: pointer;
  z-index: 10;
}

.menu-toggle span {
  display: block;
  height: 3px;
  background-color: #000;
  border-radius: 2px;
  margin: 3px;
  -webkit-transition: all 0.3s ease;
  transition: all 0.3s ease;
  width: 100%;
}

.menu-toggle.active span:nth-child(1) {
  -webkit-transform: rotate(45deg) translateY(15px);
          transform: rotate(45deg) translateY(15px);
}

.menu-toggle.active span:nth-child(2) {
  opacity: 0;
}

.menu-toggle.active span:nth-child(3) {
  -webkit-transform: rotate(-45deg) translateY(-15px);
          transform: rotate(-45deg) translateY(-15px);
}

#mobile-menu {
  -webkit-box-orient: vertical;
  -webkit-box-direction: normal;
      -ms-flex-direction: column;
          flex-direction: column;
  background-color: #1a1a1a;
  position: absolute;
  top: 80px;
  left: 0;
  width: 100%;
  z-index: 5;
  padding: 10px 0;
  -webkit-transform: translateY(-100%);
          transform: translateY(-100%);
  opacity: 0;
  visibility: hidden;
  -webkit-transition: opacity 0.3s ease, visibility 0.3s ease, -webkit-transform 0.3s ease;
  transition: opacity 0.3s ease, visibility 0.3s ease, -webkit-transform 0.3s ease;
  transition: transform 0.3s ease, opacity 0.3s ease, visibility 0.3s ease;
  transition: transform 0.3s ease, opacity 0.3s ease, visibility 0.3s ease, -webkit-transform 0.3s ease;
}

#mobile-menu ul {
  -webkit-box-orient: vertical;
  -webkit-box-direction: normal;
      -ms-flex-direction: column;
          flex-direction: column;
  margin: 0;
  padding: 0;
}

#mobile-menu ul li {
  padding: 10px 20px;
  text-align: center;
}

#mobile-menu ul li a {
  color: #000;
  text-decoration: none;
  font-size: 18px;
}

#mobile-menu ul li:hover {
  background-color: #2768C9;
}

#mobile-menu.active {
  display: -webkit-box;
  display: -ms-flexbox;
  display: flex;
  -webkit-transform: translateY(0);
          transform: translateY(0);
  opacity: 1;
  visibility: visible;
}

#right-header {
  display: -webkit-box;
  display: -ms-flexbox;
  display: flex;
  -webkit-box-align: center;
      -ms-flex-align: center;
          align-items: center;
  gap: 1.5vw;
  margin-right: 1rem;
}

#contact-info a img {
  width: 2vw;
  height: 2vw;
}

#language {
  font-family: "PT Sans", sans-serif;
  font-weight: bold;
  font-size: 1rem;
  display: -webkit-box;
  display: -ms-flexbox;
  display: flex;
  -webkit-box-orient: vertical;
  -webkit-box-direction: normal;
      -ms-flex-direction: column;
          flex-direction: column;
  -webkit-box-align: center;
      -ms-flex-align: center;
          align-items: center;
  max-width: 80px;
}

#language a {
  text-decoration: none;
  color: inherit;
  margin: 0.1rem 0;
}

#language a:hover {
  color: #82DE12;
  background-color: rgba(130, 222, 18, 0.1);
}

#language a:active {
  -webkit-transform: scale(0.98);
          transform: scale(0.98);
  background-color: rgba(130, 222, 18, 0.2);
}

#language .separator {
  height: 2px;
  background-color: #000;
}

.burger-menu {
  display: none;
  font-size: 2rem;
  cursor: pointer;
}

@media (max-width: 768px) {
  .header {
    height: auto;
    -webkit-box-orient: horizontal;
    -webkit-box-direction: normal;
        -ms-flex-direction: row;
            flex-direction: row;
    -webkit-box-pack: justify;
        -ms-flex-pack: justify;
            justify-content: space-between;
    padding: 10px;
  }
  #logo img {
    width: 100px;
  }
  #desktop-menu {
    display: none;
  }
  #mobile-menu {
    display: -webkit-box;
    display: -ms-flexbox;
    display: flex;
  }
  .menu-toggle {
    display: block;
  }
  #right-header {
    display: none;
  }
  #right-header {
    display: none;
  }
}
.main-section {
  background-color: #EFEFEF;
  display: -webkit-box;
  display: -ms-flexbox;
  display: flex;
  -webkit-box-pack: justify;
      -ms-flex-pack: justify;
          justify-content: space-between;
  -webkit-box-align: center;
      -ms-flex-align: center;
          align-items: center;
  height: 560px;
  margin: 0 auto;
  position: relative;
  padding: 5vw;
}

.main-content {
  display: -webkit-box;
  display: -ms-flexbox;
  display: flex;
  -webkit-box-align: center;
      -ms-flex-align: center;
          align-items: center;
  -webkit-box-pack: justify;
      -ms-flex-pack: justify;
          justify-content: space-between;
}

.left-container {
  background-color: #FFFFFF;
  padding: 3rem;
  -webkit-box-shadow: 0px 4px 20px rgba(0, 0, 0, 0.1);
          box-shadow: 0px 4px 20px rgba(0, 0, 0, 0.1);
  max-width: 70%;
}

.left-column {
  -webkit-box-flex: 1;
      -ms-flex: 1;
          flex: 1;
}

.left-column h1 {
  font-family: "PT Sans", sans-serif;
  font-weight: bold;
  font-size: 2rem;
  margin-bottom: 0.5rem;
}

.left-column p {
  font-family: "PT Sans", sans-serif;
  font-size: 1.2rem;
  margin-top: 1rem;
  margin-bottom: 2rem;
}

.join-btn {
  background-color: #82DE12;
  color: #fff;
  padding: 0.8rem 1.5rem;
  font-size: 1rem;
  border: none;
  border-radius: 4px;
  cursor: pointer;
  -webkit-transition: background-color 0.3s ease, -webkit-transform 0.3s ease;
  transition: background-color 0.3s ease, -webkit-transform 0.3s ease;
  transition: background-color 0.3s ease, transform 0.3s ease;
  transition: background-color 0.3s ease, transform 0.3s ease, -webkit-transform 0.3s ease;
}

.join-btn:hover {
  background-color: #74c50d;
  -webkit-transform: scale(1.05);
          transform: scale(1.05);
}

.right-column {
  display: -webkit-box;
  display: -ms-flexbox;
  display: flex;
  -webkit-box-orient: vertical;
  -webkit-box-direction: normal;
      -ms-flex-direction: column;
          flex-direction: column;
  -webkit-box-align: end;
      -ms-flex-align: end;
          align-items: flex-end;
}

.right-img {
  width: 30vw;
  height: auto;
  position: relative;
  z-index: 2;
}

.green-rectangle {
  position: absolute;
  right: 0;
  top: 0;
  width: 20%;
  height: 100%;
  background-color: #82DE12;
  z-index: 1;
}

.courses {
  height: 140vh;
  background: #EFEFEF;
  position: relative;
  display: -webkit-box;
  display: -ms-flexbox;
  display: flex;
  -webkit-box-orient: vertical;
  -webkit-box-direction: normal;
      -ms-flex-direction: column;
          flex-direction: column;
  -webkit-box-align: center;
      -ms-flex-align: center;
          align-items: center;
}
.courses-title-wrapper {
  display: inline-block;
  padding: 20px 40px;
  margin-bottom: 120px;
  margin-top: 40px;
  background: #82DE12;
  -webkit-transform: rotate(-2deg);
          transform: rotate(-2deg);
  z-index: 2;
}
.courses-title {
  font-family: "PT Sans", sans-serif;
  font-weight: bold;
  font-size: 36px;
  font-weight: bold;
  color: #000;
  z-index: 3;
}
.courses-triangle {
  position: absolute;
  padding: 0;
  top: 0;
  right: 0;
  width: 0;
  height: 0;
  border-top: 270px solid #79CA17;
  border-left: 270px solid transparent;
  z-index: 0;
}
.courses-content {
  width: 80%;
  overflow: hidden;
  position: relative;
}
.courses-arrow {
  width: 40px;
  height: 40px;
  background: #82DE12;
  border: none;
  cursor: pointer;
  clip-path: polygon(100% 50%, 0 0, 0 100%);
  -webkit-transition: -webkit-transform 0.2s ease-in-out;
  transition: -webkit-transform 0.2s ease-in-out;
  transition: transform 0.2s ease-in-out;
  transition: transform 0.2s ease-in-out, -webkit-transform 0.2s ease-in-out;
  position: absolute;
  top: 50%;
  z-index: 3;
}
.courses-arrow.left-arrow {
  -webkit-transform: rotate(180deg);
          transform: rotate(180deg);
  left: 10px;
}
.courses-arrow.right-arrow {
  right: 10px;
}
.courses-arrow.left-arrow:hover {
  -webkit-transform: rotate(180deg) scale(1.1);
          transform: rotate(180deg) scale(1.1);
}
.courses-arrow.right-arrow:hover {
  -webkit-transform: scale(1.1);
          transform: scale(1.1);
}

.course-wrapper {
  display: -webkit-box;
  display: -ms-flexbox;
  display: flex;
  gap: 20px;
  -webkit-transition: -webkit-transform 0.5s ease-in-out;
  transition: -webkit-transform 0.5s ease-in-out;
  transition: transform 0.5s ease-in-out;
  transition: transform 0.5s ease-in-out, -webkit-transform 0.5s ease-in-out;
}

.course-container {
  width: 30%;
  background: #fff;
  -webkit-box-orient: vertical;
  -webkit-box-direction: normal;
      -ms-flex-direction: column;
          flex-direction: column;
  -webkit-box-shadow: 0 4px 10px rgba(0, 0, 0, 0.1);
          box-shadow: 0 4px 10px rgba(0, 0, 0, 0.1);
  border-radius: 10px;
  z-index: 1;
  -webkit-box-flex: 0;
      -ms-flex: 0 0 33.3333333333%;
          flex: 0 0 33.3333333333%;
  margin-right: 20px;
  -webkit-transition: -webkit-transform 0.5s ease-in-out;
  transition: -webkit-transform 0.5s ease-in-out;
  transition: transform 0.5s ease-in-out;
  transition: transform 0.5s ease-in-out, -webkit-transform 0.5s ease-in-out;
}

.course-image {
  padding: 0;
  width: 100%;
  height: auto;
}

.course-divider {
  width: 100%;
  height: 8px;
  background: #82DE12;
  margin-bottom: 8px;
}

.course-title {
  font-family: "PT Sans", sans-serif;
  font-size: 32px;
  font-weight: bold;
  margin-left: 10px;
  margin-bottom: 8px;
  color: #000;
}

.course-authors {
  font-family: "PT Sans", sans-serif;
  font-size: 16px;
  color: #555;
  margin-left: 10px;
  padding-bottom: 96px;
}

.about {
  background-color: #EFEFEF;
  padding: 50px 0;
  position: relative;
}
.about-container {
  max-width: 1200px;
  margin: 0 auto;
  display: -webkit-box;
  display: -ms-flexbox;
  display: flex;
  -webkit-box-align: center;
      -ms-flex-align: center;
          align-items: center;
  gap: 40px;
  padding: 0 20px;
}
@media (max-width: 1024px) {
  .about-container {
    -webkit-box-orient: vertical;
    -webkit-box-direction: normal;
        -ms-flex-direction: column;
            flex-direction: column;
    text-align: center;
  }
}
.about-image {
  -webkit-box-flex: 1;
      -ms-flex: 1;
          flex: 1;
  display: -webkit-box;
  display: -ms-flexbox;
  display: flex;
  -webkit-box-pack: center;
      -ms-flex-pack: center;
          justify-content: center;
}
.about-image-box {
  background-color: #fff;
  width: 50%;
  height: 100%;
  border-radius: 0 200px 0 0;
  -webkit-box-shadow: 0 5px 15px rgba(0, 0, 0, 0.1);
          box-shadow: 0 5px 15px rgba(0, 0, 0, 0.1);
  display: -webkit-box;
  display: -ms-flexbox;
  display: flex;
  -webkit-box-align: center;
      -ms-flex-align: center;
          align-items: center;
  -webkit-box-pack: center;
      -ms-flex-pack: center;
          justify-content: center;
  position: absolute;
  left: 0;
  top: 0;
}
@media (max-width: 1024px) {
  .about-image {
    position: relative;
    width: 100%;
    height: auto;
    border-radius: 0;
    padding: 20px;
  }
}
.about-image-gif {
  max-width: 90%;
  height: auto;
}
.about-content {
  -webkit-box-flex: 1;
      -ms-flex: 1;
          flex: 1;
  font-family: "PT Sans", sans-serif;
  max-width: 600px;
  margin-left: 20px;
  z-index: 2;
}
.about-title {
  background: #b0ff2c;
  display: inline-block;
  padding: 8px 16px;
  font-size: 24px;
  font-weight: bold;
  position: relative;
  -webkit-transform: skewX(-10deg);
          transform: skewX(-10deg);
  margin-bottom: 20px;
}
.about-title:before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: #000;
  z-index: -1;
  -webkit-transform: skewX(10deg);
          transform: skewX(10deg);
  padding: 5px;
}
.about p {
  font-size: 18px;
  color: #333;
  line-height: 1.6;
  margin-bottom: 15px;
}
.about p strong {
  font-weight: bold;
}
.about p em {
  font-style: italic;
}

.partners {
  background-color: #D9D9D9;
  padding: 20px 0;
  text-align: center;
}
.partners-title {
  font-size: 24px;
  font-family: "PT Sans", sans-serif;
  font-weight: bold;
  margin-bottom: 20px;
}
.partners-logos {
  display: -webkit-box;
  display: -ms-flexbox;
  display: flex;
  -webkit-box-pack: center;
      -ms-flex-pack: center;
          justify-content: center;
  -webkit-box-align: center;
      -ms-flex-align: center;
          align-items: center;
  gap: 120px;
}
.partners-logos img {
  height: auto;
  max-width: 200px;
}

.collaboration {
  background-color: #EFEFEF;
  position: relative;
}
.collaboration-content {
  display: -webkit-box;
  display: -ms-flexbox;
  display: flex;
  -webkit-box-align: stretch;
      -ms-flex-align: stretch;
          align-items: stretch;
  -webkit-box-pack: justify;
      -ms-flex-pack: justify;
          justify-content: space-between;
  height: 100vh;
}
.collaboration-text {
  font-family: "PT Sans", sans-serif;
  padding-left: 48px;
  max-width: 50%;
  -webkit-box-pack: center;
      -ms-flex-pack: center;
          justify-content: center;
}
.collaboration p {
  font-size: 18px;
  color: #333;
  line-height: 1.6;
  padding-bottom: 16px;
}
.collaboration-buttons {
  margin: 32px 0;
}
.collaboration-buttons .btn {
  display: inline-block;
  padding: 10px 20px;
  font-weight: bold;
  text-decoration: none;
  margin-right: 10px;
}
.collaboration-buttons .btn-green {
  background: #A6FF00;
  color: #000;
}
.collaboration-buttons .btn-gray {
  background: #444;
  color: #FFF;
}
.collaboration-image {
  width: 50%;
  height: 100vh;
  overflow: hidden;
  position: relative;
}
.collaboration-image img {
  width: 100%;
  height: 100%;
  -o-object-fit: cover;
     object-fit: cover;
  -webkit-filter: brightness(0.7);
          filter: brightness(0.7);
}

.footer {
  background: #fff;
  padding: 40px 0;
  padding-bottom: 0;
  font-family: "PT Sans", sans-serif;
}
.footer .container {
  max-width: 1200px;
  margin: 0 auto;
  display: -webkit-box;
  display: -ms-flexbox;
  display: flex;
  -webkit-box-orient: vertical;
  -webkit-box-direction: normal;
      -ms-flex-direction: column;
          flex-direction: column;
}
.footer-logo {
  padding-bottom: 16px;
}
.footer-columns {
  display: -webkit-box;
  display: -ms-flexbox;
  display: flex;
  -webkit-box-pack: justify;
      -ms-flex-pack: justify;
          justify-content: space-between;
  gap: 40px;
}
.footer-columns .footer-column {
  -webkit-box-flex: 1;
      -ms-flex: 1;
          flex: 1;
}
.footer-columns .footer-column h3 {
  font-size: 18px;
  font-weight: bold;
  margin-bottom: 12px;
}
.footer-columns .footer-column ul {
  list-style: none;
  padding: 0;
}
.footer-columns .footer-column ul li {
  margin-bottom: 8px;
}
.footer-columns .footer-column ul li a {
  text-decoration: none;
  color: #000;
  font-size: 16px;
}
.footer-columns .footer-column ul li a:hover {
  text-decoration: underline;
}
.footer-bottom {
  background: #444;
  color: #fff;
  text-align: center;
  padding: 10px;
  margin-top: 20px;
  font-size: 14px;
}