:root {
      --bs-primary: #4F46E5;
      --bs-primary-rgb: 79, 70, 229;
      --bs-secondary: #F59E0B;
      --bs-secondary-rgb: 245, 158, 11;
      --bs-tertiary: #F8FAFC;
      --bs-tertiary-rgb: 248, 250, 252;
      --primary: #4F46E5;
      --secondary: #F59E0B;
      --accent: #10B981;
      --tertiary: #F8FAFC;
    }

    * {
      -webkit-font-smoothing: antialiased;
    }

    body {
      font-family: 'Rubik', sans-serif;
      color: #334155;
      overflow-x: hidden;
    }

    img {
      max-width: 100%;
      height: auto;
    }

    a {
      text-decoration: none;
      transition: 0.3s;
    }

    .btn-primary {
      background-color: var(--bs-primary);
      border-color: var(--bs-primary);
      border-radius: 8px;
      padding: 0.6rem 1.5rem;
      font-weight: 500;
      transition: 0.3s;
    }

    .btn-primary:hover {
      background-color: #4338CA;
      border-color: #4338CA;
      transform: translateY(-2px);
      box-shadow: 0 4px 12px rgba(79, 70, 229, 0.3);
    }

    /* Navbar */
    .navigation {
      background-color: var(--bs-tertiary) !important;
      box-shadow: 0 2px 10px rgba(0,0,0,0.03);
      position: sticky;
      top: 0;
      z-index: 1030;
    }

    .nav-link {
      font-weight: 500;
      color: #334155;
      padding: 0.5rem 1rem !important;
    }

    .nav-link:hover, .nav-link.active {
      color: var(--bs-primary);
    }

    /* Shapes & Sections */
    .has-shapes {
      position: absolute;
      top: 0;
      left: 0;
      width: 100%;
      height: 100%;
      pointer-events: none;
      z-index: 0;
      overflow: hidden;
    }
    
    .has-shapes svg {
      opacity: 0.4;
    }

    .container {
      position: relative;
      z-index: 2;
    }

    .section {
      padding: 5rem 0;
    }

    .section-sm {
      padding: 3rem 0;
    }

    .page-header {
      background-color: var(--bs-tertiary) !important;
      padding: 4rem 0;
    }

    .page-header h2 {
      font-weight: 700;
      color: #1E293B;
    }

    .bg-tertiary {
      background-color: var(--bs-tertiary) !important;
    }

    /* Sidebar */
    .sidebar-card {
      background: #fff;
      border-radius: 12px;
      box-shadow: 0 4px 15px rgba(0,0,0,0.04);
      border: 1px solid #f1f5f9;
      padding: 1.5rem;
    }

    .table-of-contents ul {
      list-style: none;
      padding-left: 0;
      margin: 0;
    }
    .table-of-contents li a {
      display: block;
      padding: 8px 0;
      color: #64748B;
      border-left: 2px solid #e2e8f0;
      padding-left: 15px;
      transition: 0.3s;
      font-size: 0.95rem;
    }
    .table-of-contents li a:hover {
      color: var(--bs-primary);
      border-color: var(--bs-primary);
      background: rgba(var(--bs-primary-rgb), 0.03);
    }

    .pricing-box {
      text-align: center;
      margin-top: 20px;
    }
    .pricing-box h4 {
      font-size: 1.1rem;
      color: #1E293B;
      margin-bottom: 0.5rem;
    }
    .price {
      font-size: 2.5rem;
      font-weight: 700;
      color: var(--bs-secondary);
    }

    /* Content Typography */
    .content h2 {
      font-weight: 700;
      color: #1E293B;
      font-size: 1.75rem;
      margin-bottom: 1rem;
    }

    .content p {
      line-height: 1.8;
      color: #475569;
      margin-bottom: 1.2rem;
    }

    /* Course Highlights */
    .course-highlight {
      background: #fff;
      border: 1px solid #f1f5f9;
      border-radius: 12px;
      padding: 20px;
      height: 100%;
      box-shadow: 0 2px 8px rgba(0,0,0,0.03);
    }
    .course-highlight h4 {
      font-size: 1.1rem;
      font-weight: 600;
      color: var(--bs-primary);
      margin-bottom: 5px;
    }
    .course-highlight p {
      margin-bottom: 0;
      color: #475569;
      font-size: 0.95rem;
    }

    /* Feature List */
    .feature-list {
      list-style: none;
      padding: 0;
      margin: 0;
    }
    .feature-list li {
      margin-bottom: 12px;
      padding-left: 30px;
      position: relative;
      color: #475569;
    }
    .feature-list li i {
      position: absolute;
      left: 0;
      top: 5px;
      color: var(--accent);
      font-size: 18px;
    }

    /* Course Modules */
    .course-module {
      background: #fff;
      border: 1px solid #f1f5f9;
      border-radius: 12px;
      padding: 20px;
      margin-bottom: 20px;
    }
    .module-title {
      border-bottom: 1px solid #e2e8f0;
      padding-bottom: 10px;
      margin-bottom: 15px;
      font-size: 1.2rem;
      font-weight: 600;
      color: #1E293B;
    }
    .course-module .feature-list li i {
      color: var(--bs-primary);
    }

    /* Instructor */
    .instructor-box {
      background: #fff;
      border: 1px solid #f1f5f9;
      border-radius: 12px;
      padding: 20px;
      display: flex;
      align-items: center;
      gap: 20px;
    }

    /* Footer */
    footer {
      background-color: var(--bs-tertiary) !important;
      padding-top: 4rem !important;
    }
    .footer-widget h5 {
      font-weight: 600;
      color: #1E293B;
    }
    .footer-widget ul li a {
      color: #64748B;
      font-size: 0.95rem;
    }
    .footer-widget ul li a:hover {
      color: var(--bs-primary);
      padding-left: 5px;
    }
    .social-icons a {
      color: #64748B;
      font-size: 1.2rem;
      transition: 0.3s;
    }
    .social-icons a:hover {
      color: var(--bs-primary);
      transform: translateY(-3px);
    }

    @media (max-width: 768px) {
      .section {
        padding: 3rem 0;
      }
      .page-header {
        padding: 2rem 0;
      }
      .sidebar-card {
        margin-bottom: 30px;
      }
      .instructor-box {
        flex-direction: column;
        text-align: center;
      }
    }