:root {
  --primary-gradient: linear-gradient(135deg, #6e8efb 0%, #4a6bff 100%);
  --secondary-gradient: linear-gradient(135deg, #ff6b6b 0%, #ff8e8e 100%);
  --dark-gradient: linear-gradient(135deg, #2d3748 0%, #1a202c 100%);
  --cta-gradient: linear-gradient(135deg, #4facfe 0%, #00f2fe 100%);
  --success-gradient: linear-gradient(135deg, #48bb78 0%, #38a169 100%);
  --card-gradient: linear-gradient(135deg, #ffffff 0%, #f7fafc 100%);
  --testimonial-gradient: linear-gradient(135deg, #f8f9fa 0%, #e2e8f0 100%);

  --primary-color: #4a6bff;
  --secondary-color: #ff6b6b;
  --dark-color: #2d3748;
  --light-color: #f7fafc;
  --gray-color: #a0aec0;
  --success-color: #48bb78;
}

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
  font-family: "Segoe UI", Tahoma, Geneva, Verdana, sans-serif;
}

body {
  line-height: 1.6;
  color: var(--dark-color);
  background-color: #fff;
  overflow-x: hidden;
}

.container {
  width: 90%;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 15px;
}

h1,
h2,
h3,
h4 {
  margin-bottom: 1rem;
  line-height: 1.2;
}

p {
  margin-bottom: 1rem;
}

a {
  text-decoration: none;
  color: inherit;
}

ul {
  list-style: none;
}

button {
  cursor: pointer;
  border: none;
  outline: none;
  padding: 0.75rem 1.5rem;
  border-radius: 5px;
  font-weight: 600;
  transition: all 0.3s ease;
}

.btn-primary {
  background: var(--primary-gradient);
  color: white;
}

.btn-primary:hover {
  background: linear-gradient(135deg, #5d7df5 0%, #3a56d4 100%);
  transform: translateY(-2px);
  box-shadow: 0 5px 15px rgba(74, 107, 255, 0.3);
}

.btn-secondary {
  background: var(--secondary-gradient);
  color: white;
}

.btn-secondary:hover {
  background: linear-gradient(135deg, #e05555 0%, #c53030 100%);
  transform: translateY(-2px);
  box-shadow: 0 5px 15px rgba(255, 107, 107, 0.3);
}

header {
  background-color: white;
  box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
  position: fixed;
  width: 100%;
  z-index: 1000;
  padding: 1rem 0;
}

header .container {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.logo h1 {
  font-size: 1.8rem;
  color: var(--dark-color);
}

.logo span {
  color: var(--primary-color);
}

nav ul {
  display: flex;
}

nav ul li {
  margin-left: 2rem;
}

nav ul li a {
  font-weight: 600;
  transition: all 0.3s ease;
  position: relative;
}

nav ul li a::after {
  content: "";
  position: absolute;
  bottom: -5px;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--primary-gradient);
  transition: width 0.3s ease;
}

nav ul li a:hover::after {
  width: 100%;
}

nav ul li a:hover {
  color: var(--primary-color);
}

.auth-buttons .login {
  background: transparent;
  color: var(--dark-color);
  margin-right: 1rem;
}

.auth-buttons .signup {
  background: var(--primary-gradient);
  color: white;
}

.mobile-nav-container {
  display: flex;
  align-items: center;
  margin-left: auto;
}

.mobile-menu {
  display: none;
  background: transparent;
  border: none;
  cursor: pointer;
  padding: 10px;
  z-index: 1002;
  position: relative;
}

.hamburger {
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  width: 30px;
  height: 21px;
}

.hamburger .bar {
  height: 3px;
  width: 100%;
  background-color: var(--dark-color);
  border-radius: 3px;
  transition: all 0.3s ease;
}

.mobile-menu.open .bar1 {
  transform: translateY(9px) rotate(45deg);
}

.mobile-menu.open .bar2 {
  opacity: 0;
}

.mobile-menu.open .bar3 {
  transform: translateY(-9px) rotate(-45deg);
}

@media (max-width: 768px) {
  .mobile-menu {
    display: flex;
    align-items: center;
  }

  .desktop-auth {
    display: none;
  }

  nav ul {
    position: fixed;
    top: 0;
    left: -100%;
    width: 80%;
    max-width: 300px;
    height: 100vh;
    background: var(--dark-gradient);
    flex-direction: column;
    justify-content: center;
    align-items: center;
    z-index: 1000;
    transition: all 0.5s cubic-bezier(0.645, 0.045, 0.355, 1);
    padding: 2rem;
    box-shadow: 5px 0 15px rgba(0, 0, 0, 0.1);
  }

  nav ul.show {
    left: 0;
  }

  nav ul li {
    margin: 1.5rem 0;
    opacity: 0;
    transform: translateX(-20px);
    transition: all 0.4s ease;
  }

  nav ul.show li {
    opacity: 1;
    transform: translateX(0);
  }

  nav ul li:nth-child(1) {
    transition-delay: 0.1s;
  }

  nav ul li:nth-child(2) {
    transition-delay: 0.2s;
  }

  nav ul li:nth-child(3) {
    transition-delay: 0.3s;
  }

  nav ul li:nth-child(4) {
    transition-delay: 0.4s;
  }

  nav ul li:nth-child(5) {
    transition-delay: 0.5s;
  }

  nav ul li a {
    color: white;
    font-size: 1.2rem;
    padding: 0.5rem 1rem;
  }

  .mobile-auth {
    display: flex;
    flex-direction: column;
    width: 100%;
    max-width: 200px;
    margin-top: 2rem;
    gap: 1rem;
    opacity: 0;
    transform: translateX(-20px);
    transition: all 0.4s ease 0.6s;
  }

  nav ul.show .mobile-auth {
    opacity: 1;
    transform: translateX(0);
  }

  .mobile-auth button {
    width: 100%;
  }

  .mobile-auth .login {
    background: transparent;
    border: 2px solid white;
    color: white;
  }

  .mobile-auth .signup {
    background: white;
    color: var(--primary-color);
  }
}

@media (min-width: 769px) {
  .mobile-auth {
    display: none;
  }
}

.hero {
  padding: 8rem 0 4rem;
  background: linear-gradient(135deg, #f8f9fa 0%, #e2e8f0 100%);
}

.hero .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.hero-content {
  flex: 1;
  padding-right: 2rem;
}

.hero-content h1 {
  font-size: 2.5rem;
  margin-bottom: 1.5rem;
  color: var(--dark-color);
  background: linear-gradient(to right, #4a6bff, #6e8efb);
  background-clip: text;
  -webkit-text-fill-color: transparent;
}

.hero-content p {
  font-size: 1.1rem;
  color: var(--gray-color);
  margin-bottom: 2rem;
  max-width: 500px;
}

.search-bar {
  display: flex;
  max-width: 500px;
  box-shadow: 0 5px 15px rgba(0, 0, 0, 0.1);
  border-radius: 5px;
  transform: translateY(20px);
  opacity: 0;
  animation: fadeInUp 0.8s ease forwards 0.5s;
}

@keyframes fadeInUp {
  to {
    transform: translateY(0);
    opacity: 1;
  }
}

.search-bar input {
  flex: 1;
  padding: 0.75rem 1rem;
  border: 1px solid #ddd;
  border-radius: 5px 0 0 5px;
  font-size: 1rem;
  border-right: none;
}

.search-bar button {
  border-radius: 0 5px 5px 0;
  background: var(--primary-gradient);
  color: white;
  display: flex;
  align-items: center;
  transition: all 0.3s ease;
}

.search-bar button:hover {
  background: linear-gradient(135deg, #5d7df5 0%, #3a56d4 100%);
}

.search-bar button i {
  margin-right: 0.5rem;
}

.hero-image {
  flex: 1;
  text-align: center;
  animation: float 6s ease-in-out infinite;
}

@keyframes float {
  0% {
    transform: translateY(0px);
  }

  50% {
    transform: translateY(-20px);
  }

  100% {
    transform: translateY(0px);
  }
}

.hero-image img {
  max-width: 100%;
  height: auto;
}
.hero-bubbles {
  position: relative;
  width: 100%;
  height: 100px;
  overflow: hidden;
}

.bubble {
  position: absolute;
  border-radius: 50%;
  background: rgba(74, 107, 255, 0.15);
  animation: floatBubble 15s infinite linear;
  opacity: 0;
  box-shadow: 0 0 10px rgba(74, 107, 255, 0.3);
}

.bubble-1 {
  width: 40px;
  height: 40px;
  left: 10%;
  top: 20%;
  animation-delay: 0s;
  background: rgba(74, 107, 255, 0.2);
}

.bubble-2 {
  width: 60px;
  height: 60px;
  left: 30%;
  top: 40%;
  animation-delay: 3s;
  background: rgba(255, 107, 107, 0.2);
}

.bubble-3 {
  width: 30px;
  height: 30px;
  left: 60%;
  top: 30%;
  animation-delay: 6s;
  background: rgba(72, 187, 120, 0.2);
}

@keyframes floatBubble {
  0% {
    transform: translateY(0) translateX(0);
    opacity: 0;
  }
  10% {
    opacity: 0.5;
  }
  50% {
    transform: translateY(-50px) translateX(20px);
    opacity: 0.8;
  }
  90% {
    opacity: 0.5;
  }
  100% {
    transform: translateY(-100px) translateX(40px);
    opacity: 0;
  }
}

.courses {
  padding: 5rem 0;
  text-align: center;
}

.courses h2 {
  font-size: 2rem;
  color: var(--dark-color);
}

.courses p {
  color: var(--gray-color);
  margin-bottom: 3rem;
}

.course-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 2rem;
  margin-bottom: 3rem;
}

.course-card {
  background: var(--card-gradient);
  border-radius: 15px;
  overflow: hidden;
  box-shadow: 0 10px 20px rgba(0, 0, 0, 0.1);
  transition: all 0.4s cubic-bezier(0.175, 0.885, 0.32, 1.275);
  opacity: 0;
  transform: translateY(20px);
}

.course-card.animate {
  opacity: 1;
  transform: translateY(0);
}

.course-card:hover {
  transform: translateY(-10px) scale(1.02);
  box-shadow: 0 15px 30px rgba(0, 0, 0, 0.2);
}

.course-image {
  height: 200px;
  overflow: hidden;
}

.course-image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.5s ease;
}

.course-card:hover .course-image img {
  transform: scale(1.1);
}

.course-info {
  padding: 1.5rem;
  text-align: left;
}

.course-info h3 {
  font-size: 1.2rem;
  margin-bottom: 0.5rem;
  color: var(--dark-color);
}

.course-info p {
  color: var(--gray-color);
  font-size: 0.9rem;
  margin-bottom: 1rem;
}

.course-meta {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 1rem;
}

.course-meta span {
  font-size: 0.9rem;
  color: var(--gray-color);
}

.course-meta .rating {
  color: #fbbf24;
}

.course-price {
  font-weight: bold;
  font-size: 1.2rem;
  color: var(--primary-color);
  background: var(--primary-gradient);
  background-clip: text;
  -webkit-text-fill-color: transparent;
}

.view-all {
  background-color: transparent;
  border: 2px solid var(--primary-color);
  color: var(--primary-color);
  font-weight: 600;
  padding: 0.75rem 2rem;
  transition: all 0.3s ease;
}

.view-all:hover {
  background: var(--primary-gradient);
  color: white;
  border-color: transparent;
  transform: translateY(-3px);
  box-shadow: 0 10px 20px rgba(74, 107, 255, 0.2);
}

.features {
  padding: 5rem 0;
  background-color: #f8f9fa;
  text-align: center;
}

.features h2 {
  font-size: 2rem;
  color: var(--dark-color);
  margin-bottom: 1rem;
}

.features-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
  gap: 2rem;
  margin-top: 3rem;
}

.feature {
  background-color: white;
  padding: 2rem;
  border-radius: 15px;
  box-shadow: 0 5px 15px rgba(0, 0, 0, 0.05);
  transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.feature:hover {
  transform: translateY(-10px);
  box-shadow: 0 15px 30px rgba(0, 0, 0, 0.1);
}

.feature-icon {
  width: 80px;
  height: 80px;
  margin: 0 auto 1.5rem;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--primary-gradient);
  border-radius: 50%;
  color: white;
  font-size: 2rem;
  box-shadow: 0 10px 20px rgba(74, 107, 255, 0.2);
  transition: all 0.3s ease;
}

.feature:hover .feature-icon {
  transform: rotate(15deg) scale(1.1);
  animation: bounce 0.5s ease;
}

@keyframes bounce {
  0%,
  100% {
    transform: rotate(15deg) scale(1.1);
  }

  50% {
    transform: rotate(15deg) scale(1.2);
  }
}

.feature h3 {
  font-size: 1.2rem;
  margin-bottom: 1rem;
}

.feature p {
  color: var(--gray-color);
  font-size: 0.95rem;
}

.testimonials {
  padding: 5rem 0;
  text-align: center;
}

.testimonials h2 {
  font-size: 2rem;
  color: var(--dark-color);
  margin-bottom: 1rem;
}

.testimonial-slider {
  position: relative;
  max-width: 800px;
  margin: 3rem auto 0;
}

.testimonial {
  background: var(--testimonial-gradient);
  padding: 3rem 2rem 2rem;
  border-radius: 15px;
  box-shadow: 0 5px 15px rgba(0, 0, 0, 0.1);
  display: none;
  position: relative;
}

.testimonial::before {
  content: '"';
  position: absolute;
  top: 20px;
  left: 20px;
  font-size: 5rem;
  color: rgba(74, 107, 255, 0.1);
  font-family: serif;
  line-height: 1;
}

.testimonial.active {
  display: block;
  animation: testimonialIn 0.8s cubic-bezier(0.175, 0.885, 0.32, 1.275) forwards;
}

@keyframes testimonialIn {
  from {
    opacity: 0;
    transform: translateX(50px) scale(0.95);
  }

  to {
    opacity: 1;
    transform: translateX(0) scale(1);
  }
}

.testimonial p {
  font-size: 1.1rem;
  font-style: italic;
  color: var(--dark-color);
  margin-bottom: 2rem;
  position: relative;
  z-index: 1;
}

.student {
  display: flex;
  align-items: center;
  justify-content: center;
}

.student img {
  width: 60px;
  height: 60px;
  border-radius: 50%;
  object-fit: cover;
  margin-right: 1rem;
  border: 3px solid white;
  box-shadow: 0 5px 15px rgba(0, 0, 0, 0.1);
}

.student h4 {
  font-size: 1.1rem;
  margin-bottom: 0.25rem;
  text-align: left;
}

.student span {
  color: var(--gray-color);
  font-size: 0.9rem;
  text-align: left;
  display: block;
}

.slider-controls {
  position: absolute;
  top: 50%;
  left: 0;
  right: 0;
  display: flex;
  justify-content: space-between;
  transform: translateY(-50%);
  z-index: 10;
  padding: 0 1rem;
}

.slider-controls button {
  background: var(--primary-gradient);
  color: white;
  width: 40px;
  height: 40px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 0;
  font-size: 1rem;
  box-shadow: 0 5px 15px rgba(0, 0, 0, 0.1);
  transition: all 0.3s ease;
}

.slider-controls button:hover {
  background: linear-gradient(135deg, #5d7df5 0%, #3a56d4 100%);
  transform: scale(1.1);
}

.cta {
  padding: 5rem 0;
  background: var(--cta-gradient);
  position: relative;
  overflow: hidden;
  text-align: center;
  color: white;
}

.cta::before {
  content: "";
  position: absolute;
  top: -50%;
  left: -50%;
  width: 200%;
  height: 200%;
  background: radial-gradient(
    circle,
    rgba(255, 255, 255, 0.1) 0%,
    rgba(255, 255, 255, 0) 70%
  );
  z-index: 0;
  animation: rotate 20s linear infinite;
}

@keyframes rotate {
  from {
    transform: rotate(0deg);
  }

  to {
    transform: rotate(360deg);
  }
}

.cta .container {
  position: relative;
  z-index: 1;
}

.cta h2 {
  font-size: 2rem;
  margin-bottom: 1rem;
}

.cta p {
  font-size: 1.1rem;
  margin-bottom: 2rem;
  opacity: 0.9;
  max-width: 600px;
  margin-left: auto;
  margin-right: auto;
}

.cta-button {
  background: white;
  color: var(--primary-color);
  font-size: 1.1rem;
  padding: 1rem 2.5rem;
  border-radius: 30px;
  font-weight: 600;
  box-shadow: 0 10px 20px rgba(0, 0, 0, 0.1);
  transition: all 0.3s ease;
  position: relative;
  overflow: hidden;
}

.cta-button::before {
  content: "";
  position: absolute;
  top: 0;
  left: -100%;
  width: 100%;
  height: 100%;
  background: linear-gradient(
    90deg,
    transparent,
    rgba(255, 255, 255, 0.4),
    transparent
  );
  transition: 0.5s;
}

.cta-button:hover::before {
  left: 100%;
}

.cta-button:hover {
  transform: translateY(-3px);
  box-shadow: 0 15px 30px rgba(0, 0, 0, 0.2);
}

.pulse-animate {
  animation: pulse 2s infinite;
}

@keyframes pulse {
  0% {
    transform: scale(1);
  }

  50% {
    transform: scale(1.05);
  }

  100% {
    transform: scale(1);
  }
}

footer {
  background: var(--dark-gradient);
  color: white;
  padding: 4rem 0 0;
  position: relative;
}

.footer-content {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 3rem;
  margin-bottom: 3rem;
}

.footer-about h3 {
  font-size: 1.5rem;
  margin-bottom: 1.5rem;
  background: linear-gradient(to right, #fff, #a0aec0);
  background-clip: text;
  -webkit-text-fill-color: transparent;
}

.footer-about p {
  opacity: 0.8;
  margin-bottom: 1.5rem;
}

.social-icons {
  display: flex;
  gap: 1rem;
}

.social-icons a {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  border-radius: 50%;
  background-color: rgba(255, 255, 255, 0.1);
  transition: all 0.3s ease;
  color: white;
}

.social-icons a:hover {
  background: var(--primary-gradient);
  transform: translateY(-3px);
}

.footer-links h4 {
  font-size: 1.2rem;
  margin-bottom: 1.5rem;
}

.footer-links ul li {
  margin-bottom: 0.75rem;
}

.footer-links ul li a {
  opacity: 0.8;
  transition: all 0.3s ease;
}

.footer-links ul li a:hover {
  opacity: 1;
  color: var(--primary-color);
  padding-left: 5px;
}

.footer-contact h4 {
  font-size: 1.2rem;
  margin-bottom: 1.5rem;
}

.footer-contact p {
  display: flex;
  align-items: center;
  margin-bottom: 1rem;
  opacity: 0.8;
}

.footer-contact i {
  margin-right: 0.75rem;
  color: var(--primary-color);
}

.footer-bottom {
  text-align: center;
  padding: 1.5rem 0;
  border-top: 1px solid rgba(255, 255, 255, 0.1);
}

.footer-bottom p {
  opacity: 0.7;
  font-size: 0.9rem;
}

@media (max-width: 992px) {
  .hero .container {
    flex-direction: column;
    text-align: center;
  }

  .hero-content {
    padding-right: 0;
    margin-bottom: 3rem;
  }

  .search-bar {
    margin: 0 auto;
  }

  .hero-image {
    margin-top: 2rem;
  }
}

@media (max-width: 768px) {
  nav ul {
    display: flex;
  }

  .mobile-menu {
    display: block;
  }

  .hero-content h1 {
    font-size: 2rem;
  }

  .hero {
    padding: 6rem 0 3rem;
  }

  .courses,
  .features,
  .testimonials,
  .cta {
    padding: 3rem 0;
  }

  .feature {
    padding: 1.5rem;
  }

  .testimonial-slider {
    padding: 0 2rem;
  }
}

@media (max-width: 576px) {
  .search-bar {
    flex-direction: column;
  }

  .search-bar input {
    border-radius: 5px;
    margin-bottom: 0.5rem;
    border-right: 1px solid #ddd;
  }

  .search-bar button {
    border-radius: 5px;
    justify-content: center;
  }

  .slider-controls button {
    width: 30px;
    height: 30px;
    font-size: 0.8rem;
  }

  .footer-content {
    grid-template-columns: 1fr;
    text-align: center;
  }

  .social-icons {
    justify-content: center;
  }

  .footer-contact p {
    justify-content: center;
  }
}