body {
    font-family: 'Inter', sans-serif;
    background-color: #ffffff;
    color: #212529;
    margin: 0;
    line-height: 1.7;
  }

  body::-webkit-scrollbar {
    width: 0;
    background: transparent;
  }

  .navbar-glass {
    backdrop-filter: blur(12px);
    background-color: rgba(0, 0, 0, 0.9) !important;
  }

  .navbar-nav .nav-link {
    font-weight: 500;
    position: relative;
    padding: 8px 15px;
  }

  .navbar-nav .nav-link::after {
    content: '';
    position: absolute;
    left: 0;
    bottom: 0;
    width: 0;
    height: 2px;
    background: #0d6efd;
    transition: width 0.3s ease;
  }

  .navbar-nav .nav-link:hover::after {
    width: 100%;
  }

  h2.section-title {
    font-weight: 600;
    margin-bottom: 40px;
    border-bottom: 3px solid #0d6efd;
    display: inline-block;
    padding-bottom: 5px;
  }

  /* Clean sections */
  .section-block {
    margin-bottom: 50px;
  }

  /* Toggle header */
  .toggle-header {
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 10px;
    user-select: none;
    font-size: 1.4rem;
    color: #0d6efd;
    padding-bottom: 8px;
    border-bottom: 2px solid #e0e0e0;
  }

  .toggle-header i {
    transition: transform 0.25s ease;
    font-size: 1.2rem;
  }

  .toggle-header.collapsed i {
    transform: rotate(0deg);
  }

  .toggle-header:not(.collapsed) i {
    transform: rotate(90deg);
  }

  /* Fade in collapse */
  .collapse {
    transition: all 0.4s ease;
  }

  /* Certificate card */
  .certificate-card {
    background: #ffffff;
    border-radius: 14px;
    padding: 22px;
    box-shadow: 0 6px 16px rgba(0,0,0,0.10);
    margin-bottom: 28px;
    display: flex;
    align-items: center;
    gap: 20px;
    border-left: 4px solid #0d6efd;
    transition: transform 0.2s ease, box-shadow 0.3s ease;
    opacity: 0;
    animation: fadeIn 0.7s forwards;
  }

  .certificate-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 12px 28px rgba(0,0,0,0.15);
  }

  .certificate-card img {
    width: 160px;
    border-radius: 10px;
    box-shadow: 0 4px 14px rgba(0,0,0,0.15);
  }

  h3 {
    font-weight: 600;
    margin-top: 10px;
    margin-bottom: 15px;
    padding-left: 5px;
  }

  /* Fade animation */
  @keyframes fadeIn {
    from { opacity: 0; transform: translateY(10px); }
    to { opacity: 1; transform: translateY(0); }
  }

  @media (max-width: 768px) {
    .certificate-card {
      flex-direction: column;
      text-align: center;
    }
    .certificate-card img {
      margin-bottom: 15px;
    }
  }