* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
  font-family: Arial, sans-serif;
}

body {
  background: #f5f7fa;
  color: #222;
}

header {
  background: linear-gradient(135deg, #009688, #4caf50);
  color: white;
  padding: 20px;
}

nav {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 15px;
  position: relative;
}

nav ul {
  display: flex;
  list-style: none;
  gap: 20px;
}

nav a {
  color: white;
  text-decoration: none;
  font-weight: bold;
}

.nav-toggle-input {
  display: none;
}

.nav-toggle {
  display: none;
  flex-direction: column;
  justify-content: space-between;
  width: 28px;
  height: 22px;
  cursor: pointer;
}

.nav-toggle span {
  display: block;
  height: 3px;
  background: white;
  border-radius: 2px;
}

.hero {
  text-align: center;
  padding: 80px 20px;
}

.hero-image {
  width: 100%;
  max-width: 800px;
  height: auto;
  border-radius: 10px;
  margin-bottom: 20px;
}

.hero h2 {
  font-size: 42px;
  margin-bottom: 15px;
}

.hero p {
  font-size: 20px;
  margin-bottom: 20px;
}

button {
  padding: 12px 25px;
  border: none;
  background: #fff;
  color: #009688;
  font-weight: bold;
  border-radius: 8px;
  cursor: pointer;
}

.cards {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 20px;
  padding: 40px;
}

.card {
  background: white;
  padding: 25px;
  border-radius: 12px;
  box-shadow: 0 5px 15px rgba(0, 0, 0, 0.1);
  text-align: center;
}

.card img,
.course-card img,
.quiz-card img {
  width: 100%;
  height: auto;
  border-radius: 8px;
  margin-bottom: 15px;
}

footer {
  text-align: center;
  padding: 20px;
  background: #222;
  color: white;
}

.section-content {
  padding: 60px 20px;
  background: white;
}

.section-content:nth-child(even) {
  background: #f5f7fa;
}

.container {
  max-width: 1200px;
  margin: 0 auto;
}

.section-content h2 {
  font-size: 36px;
  color: #009688;
  margin-bottom: 15px;
  text-align: center;
}

.section-intro {
  text-align: center;
  font-size: 18px;
  color: #666;
  margin-bottom: 40px;
}

.courses-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 25px;
  margin-top: 30px;
}

.course-card {
  background: white;
  padding: 30px;
  border-radius: 12px;
  box-shadow: 0 5px 15px rgba(0, 0, 0, 0.1);
  border-left: 5px solid #009688;
}

.course-card h3 {
  color: #009688;
  margin-bottom: 15px;
  font-size: 22px;
}

.course-card p {
  color: #666;
  margin-bottom: 15px;
  line-height: 1.6;
}

.course-card ul {
  list-style: none;
  padding: 0;
}

.course-card li {
  padding: 8px 0;
  color: #444;
  border-bottom: 1px solid #eee;
}

.course-card li:last-child {
  border-bottom: none;
}

.quiz-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 20px;
  margin-top: 30px;
}

.quiz-card {
  background: white;
  padding: 30px;
  border-radius: 12px;
  box-shadow: 0 5px 15px rgba(0, 0, 0, 0.1);
  text-align: center;
  transition: transform 0.3s ease;
}

.quiz-card:hover {
  transform: translateY(-5px);
  box-shadow: 0 10px 25px rgba(0, 0, 0, 0.15);
}

.quiz-card h3 {
  color: #009688;
  margin-bottom: 10px;
  font-size: 20px;
}

.quiz-card p {
  color: #666;
  margin-bottom: 8px;
}

.quiz-card .description {
  font-size: 14px;
  margin-bottom: 20px;
}

.quiz-btn {
  padding: 10px 20px;
  background: #009688;
  color: white;
  border: none;
  border-radius: 6px;
  cursor: pointer;
  font-weight: bold;
  transition: background 0.3s ease;
}

.quiz-btn:hover {
  background: #007a6b;
}

.contact-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 40px;
  margin-top: 30px;
}

.contact-info,
.contact-form {
  background: white;
  padding: 30px;
  border-radius: 12px;
  box-shadow: 0 5px 15px rgba(0, 0, 0, 0.1);
}

.contact-info {
  border-left: 4px solid #009688;
}

.contact-info h3,
.contact-form h3 {
  color: #009688;
  margin-bottom: 20px;
  font-size: 22px;
}

.info-item {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 12px;
  align-items: center;
  padding: 16px 18px;
  background: #f8fafb;
  border: 1px solid #e6eef0;
  border-radius: 10px;
  margin-bottom: 18px;
}

.info-item strong {
  color: #00594e;
  display: block;
  font-size: 14px;
  text-transform: uppercase;
  letter-spacing: 0.08em;
}

.info-item p {
  color: #4a4a4a;
  margin: 0;
  font-size: 15px;
  line-height: 1.5;
}

.form-group {
  margin-bottom: 15px;
}

.form-group label {
  display: block;
  margin-bottom: 8px;
  color: #333;
  font-weight: bold;
}

.form-group input,
.form-group textarea {
  width: 100%;
  padding: 10px;
  border: 1px solid #ddd;
  border-radius: 6px;
  font-family: Arial, sans-serif;
  font-size: 14px;
}

.form-group input:focus,
.form-group textarea:focus {
  outline: none;
  border-color: #009688;
  box-shadow: 0 0 5px rgba(0, 150, 136, 0.2);
}

.form-btn {
  width: 100%;
  padding: 12px;
  background: #009688;
  color: white;
  border: none;
  border-radius: 6px;
  cursor: pointer;
  font-weight: bold;
  font-size: 16px;
  transition: background 0.3s ease;
}

.testimonials-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 25px;
  margin-top: 30px;
}

.testimonial-card {
  background: white;
  padding: 30px;
  border-radius: 12px;
  box-shadow: 0 5px 15px rgba(0, 0, 0, 0.1);
  text-align: center;
}

.testimonial-card img {
  width: 80px;
  height: 80px;
  border-radius: 50%;
  margin-bottom: 15px;
}

.testimonial-card p {
  color: #666;
  font-style: italic;
  margin-bottom: 15px;
  line-height: 1.6;
}

.testimonial-card cite {
  color: #009688;
  font-weight: bold;
}

/* Responsive Design */
@media (max-width: 768px) {
  header {
    padding: 15px;
  }

  nav {
    flex-direction: row;
    gap: 15px;
    align-items: center;
    flex-wrap: wrap;
  }

  nav h1 {
    flex: 1;
    order: 1;
  }

  .nav-toggle {
    display: flex;
    order: 2;
  }

  nav ul {
    order: 3;
    flex-basis: 100%;
  }

  nav ul {
    display: none;
    flex-direction: column;
    gap: 10px;
    text-align: center;
    width: 100%;
    margin-top: 10px;
    padding: 15px 0;
    background: rgba(255, 255, 255, 0.08);
    border-radius: 12px;
  }

  .nav-toggle-input:checked~ul {
    display: flex;
  }

  .hero {
    padding: 40px 20px;
  }

  .hero h2 {
    font-size: 32px;
  }

  .hero p {
    font-size: 16px;
  }

  .cards {
    padding: 20px;
    grid-template-columns: 1fr;
  }

  .card {
    padding: 20px;
  }

  .section-content {
    padding: 40px 15px;
  }

  .section-content h2 {
    font-size: 28px;
  }

  .courses-grid,
  .quiz-grid,
  .contact-grid {
    gap: 15px;
  }

  .course-card,
  .quiz-card,
  .contact-info,
  .contact-form {
    padding: 20px;
  }


  @media (max-width: 480px) {
    .hero h2 {
      font-size: 28px;
    }

    .hero p {
      font-size: 14px;
    }

    button {
      padding: 10px 20px;
    }
  }