*, *::before, *::after {
      box-sizing: border-box;
      margin: 0; padding: 0;
    }
    html { scroll-behavior: smooth; }
    body {
      font-family: 'Open Sans', sans-serif;
      line-height: 1.6;
      background: #f5f7fa;
      color: #333;
    }
    img {
      max-width: 100%;
      display: block;
    }
    a {
      text-decoration: none;
      color: inherit;
    }
    ul { list-style: none; }

    header {
      background: #0d47a1;
      color: #fff;
      padding: 20px 0 10px;
    }
    .container {
      width: 90%;
      max-width: 1200px;
      margin: 0 auto;
    }
    header h1 {
      font-size: 2rem;
      text-align: center;
      font-weight: 600;
      letter-spacing: 1px;
      margin-bottom: 10px;
    }

    /* NavBar */
    nav.navbar {
      background-color: #093b87;
      padding: 10px 0;
      text-align: center;
    }
    nav.navbar a {
      display: inline-block;
      margin: 0 15px;
      padding: 10px 20px;
      color: #fff;
      font-weight: 600;
      border-radius: 5px;
      transition: all 0.3s ease;
      position: relative;
    }
    nav.navbar a::after {
      content: '';
      position: absolute;
      left: 0;
      bottom: 5px;
      width: 100%;
      height: 2px;
      background: #fff;
      transform: scaleX(0);
      transform-origin: center;
      transition: transform 0.3s ease;
    }
    nav.navbar a:hover::after {
      transform: scaleX(1);
    }
    nav.navbar a:hover {
      background-color: #084ba1;
      transform: scale(1.05);
    }

    section.courses {
      padding: 40px 0;
    }
    .course-item {
      display: flex;
      align-items: center;
      justify-content: space-between;
      background: #fff;
      margin-bottom: 20px;
      border-radius: 8px;
      overflow: hidden;
      box-shadow: 0 2px 8px rgba(0,0,0,0.05);
      transition: transform 0.3s, box-shadow 0.3s;
    }
    .course-item:hover {
      transform: translateY(-3px);
      box-shadow: 0 5px 15px rgba(0,0,0,0.1);
    }
    .course-item img {
      width: 200px;
      height: 120px;
      object-fit: cover;
    }
    .course-info {
      flex: 1;
      padding: 15px 20px;
    }
    .course-info h3 {
      font-size: 1.3rem;
      margin-bottom: 8px;
      color: #0d47a1;
    }
    .course-info p {
      font-size: 0.95rem;
      color: #555;
    }
    .course-details {
      padding: 15px 20px;
      text-align: right;
    }
    .course-details .price {
      font-size: 1.1rem;
      font-weight: 600;
      color: #009688;
    }
    .course-details .btn-subscribe {
      display: inline-block;
      margin-top: 10px;
      padding: 10px 20px;
      background: #0d47a1;
      color: #fff;
      border-radius: 4px;
      font-size: 0.9rem;
      transition: background 0.3s;
    }
    .course-details .btn-subscribe:hover {
      background: #084ba1;
    }

    footer {
      background: #032c4f;
      color: #ccc;
      padding: 40px 0;
      margin-top: 40px;
    }
    .footer-grid {
      display: flex;
      flex-wrap: wrap;
      justify-content: space-between;
      gap: 20px;
    }
    .footer-col {
      flex: 1;
      min-width: 200px;
    }
    .footer-col h4 {
      font-size: 1.1rem;
      margin-bottom: 10px;
      color: #fff;
    }
    .footer-col ul li {
      margin-bottom: 8px;
    }
    .footer-col ul li a {
      color: #ccc;
      font-size: 0.9rem;
      transition: color 0.2s;
    }
    .footer-col ul li a:hover {
      color: #fff;
    }
    footer .social a {
      margin-right: 12px;
      font-size: 1.2rem;
      color: #ccc;
      transition: color 0.2s;
    }
    footer .social a:hover {
      color: #fff;
    }
    footer .copyright {
      text-align: center;
      margin-top: 30px;
      font-size: 0.85rem;
    }

    @media (max-width: 768px) {
      .course-item {
        flex-direction: column;
        text-align: center;
      }
      .course-item img {
        width: 100%;
        height: auto;
      }
      .course-details {
        text-align: center;
      }
      .footer-grid {
        flex-direction: column;
        align-items: center;
      }
      .footer-col {
        min-width: unset;
        width: 100%;
      }
    }