:root {
      --ash: #b2b2b2;
      --primary: var(--ash);
      --accent: #333;
      --bg-light: #f5f5f5;
      --text-dark: #1a1a1a;
      --brand-purple: #6b4b9a;
      --secondary-color: #5d737e;
    }
    * {
      margin: 0;
      padding: 0;
      box-sizing: border-box;
    }
    body {
      font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
      background: var(--bg-light);
      color: var(--text-dark);
      line-height: 1.6;
    }
    header {
      background: white;
      padding: 1rem 2rem;
      display: flex;
      justify-content: space-between;
      align-items: center;
      position: sticky;
      top: 0;
      z-index: 1000;
      box-shadow: 0 2px 8px rgba(0,0,0,0.05);
      height: 60px; /* Defined height for nav positioning */
    }
    .logo {
      font-size: 1.5rem;
      color: var(--accent);
      font-weight: bold;
    }
    .header-buttons {
      display: flex;
      align-items: center;
      gap: 1rem;
    }
    .header-buttons .button {
      padding: 0.5rem 1rem;
      text-decoration: none;
      font-size: 0.9rem;
    }
    .main-nav { /* Updated to use .main-nav class */
      display: none;
    }
    .main-nav.open {
      display: block;
      position: absolute;
      top: 60px; /* Below header height */
      left: 2rem; /* Align with header padding */
      width: 200px;
      background: var(--bg-light);
      box-shadow: 0 2px 5px rgba(0,0,0,0.2);
      z-index: 1001; /* Above header */
      list-style: none;
      padding: 0;
    }
    .main-nav ul {
      list-style: none;
      padding: 0;
    }
    .main-nav li {
      padding: 10px;
    }
    .main-nav a {
      text-decoration: none;
      color: var(--text-dark);
      display: block;
    }
    .hamburger {
      font-size: 1.4rem;
      cursor: pointer;
    }
    section {
      padding: 4rem 2rem;
      max-width: 1200px;
      margin: auto;
    }
    .hero {
      text-align: center;
      background: var(--brand-purple);
      color: white;
      padding: 6rem 2rem;
      border-radius: 0 0 40px 40px;
    }
    .hero h1 {
      font-size: 2.5rem;
    }
    .hero p {
      font-size: 1.1rem;
      margin-top: 1rem;
    }
    .internal-links {
      display: flex;
      justify-content: center;
      gap: 1.5rem;
      margin-top: 2rem;
      flex-wrap: wrap;
    }
    .internal-links a {
      color: white;
      text-decoration: underline;
      font-weight: bold;
      font-size: 1.1rem;
    }
    .section-title {
      font-size: 2rem;
      color: var(--accent);
      margin-bottom: 1.5rem;
      text-align: center;
    }
    .card-grid {
      display: grid;
      gap: 2rem;
      grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    }
    .card {
      background: white;
      padding: 2rem;
      border-radius: 16px;
      box-shadow: 0 8px 20px rgba(0,0,0,0.05);
      transition: transform 0.3s ease;
      opacity: 0;
      transform: translateY(20px);
      transition: opacity 0.6s ease-out, transform 0.6s ease-out;
      display: flex;
      flex-direction: column;
      align-items: center;
      text-align: center;
    }
    .card img {
      width: 100%;
      height: 200px;
      object-fit: cover;
      border-radius: 8px;
      margin-bottom: 1rem;
    }
    .card.visible {
      opacity: 1;
      transform: translateY(0);
    }
    .card:hover {
      transform: translateY(-5px);
    }
    footer {
      background: var(--accent);
      color: white;
      text-align: center;
      padding: 2rem 1rem;
      font-size: 0.9rem;
    }
    @media (min-width: 768px) {
      /* Display navigation on desktop */
      .main-nav { /* Updated to .main-nav */
        display: block;
        position: static; /* Reset to normal flow on desktop */
        width: auto;
        background: transparent;
        box-shadow: none;
        z-index: auto;
      }
      .main-nav ul {
        display: flex;
        gap: 1rem;
      }
      .main-nav li {
        padding: 0;
      }
      .hamburger {
        display: none;
      }
    }
    /* Sidebar and overlay for mobile */
    #sidebar {
      position: fixed;
      top: 0;
      right: -300px;
      width: 300px;
      height: 100vh;
      background: var(--bg-light); /* Match body background */
      transition: right 0.3s ease;
      z-index: 1002; /* Above header (1000) and nav (1001) */
      padding: 20px;
      box-shadow: -2px 0 5px rgba(0,0,0,0.2);
    }
    #sidebar.open {
      right: 0;
    }
    #sidebar ul {
      list-style: none;
      padding: 0;
    }
    #sidebar li {
      margin-bottom: 10px;
    }
    #sidebar a {
      text-decoration: none;
      color: var(--text-dark);
    }
    #overlay {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: 100vh;
      background: rgba(0,0,0,0.5);
      z-index: 999;
      display: none;
    }
    #overlay.open {
      display: block;
    }
    .container {
      width: 100%;
      max-width: 600px;
      padding: 20px;
      margin: auto;
    }
    .chart {
      margin-bottom: 20px;
    }
    .bar-container {
      background-color: #e0e0e0;
      border-radius: 20px;
      height: 25px;
      overflow: hidden;
      position: relative;
    }
    .progress-bar {
      height: 100%;
      width: 0;
      transition: width 2s ease-out;
      background-color: var(--secondary-color);
    }
    .bar-label {
      display: flex;
      justify-content: space-between;
      font-weight: bold;
      margin-bottom: 5px;
    }
    .bar-label-text {
      color: var(--text-dark);
    }
    .bar-label-value {
      color: var(--text-dark);
    }
    .button {
      display: inline-block;
      margin-top: 1rem;
      background: var(--brand-purple);
      padding: 1rem 2rem;
      border-radius: 12px;
      color: #fff;
      text-decoration: none;
    }
    #contact .button {
      animation: pulse 2s infinite ease-in-out;
      transition: transform 0.2s ease-in-out;
    }
    #contact .button:hover {
      transform: scale(1.05);
    }
    @keyframes pulse {
      0% { transform: scale(1); }
      50% { transform: scale(1.02); }
      100% { transform: scale(1); }
    }
    .popup {
      display: none;
      position: fixed;
      bottom: 30px;
      right: 30px;
      background: white;
      padding: 20px;
      border-radius: 10px;
      box-shadow: 0 4px 10px rgba(0, 0, 0, 0.15);
      z-index: 9999;
      max-width: 300px;
      opacity: 0;
      transition: opacity 0.4s ease;
    }
    .popup.visible {
      display: block;
      opacity: 1;
    }
    .popup-header {
      display: flex;
      justify-content: space-between;
      align-items: center;
      margin-bottom: 10px;
    }
    .popup-title {
      font-weight: bold;
      font-size: 1.1rem;
      color: #2c3e50;
    }
    .close-wrapper {
      float: right;
    }
    .close-btn {
      background-color: #e74c3c;
      color: white;
      border: none;
      font-size: 0.9rem;
      padding: 6px;
      cursor: pointer;
      border-radius: 6px;
      width: 28px;
      height: 28px;
      text-align: center;
      line-height: 1;
    }
    form input,
    form button {
      width: 100%;
      margin: 8px 0;
      padding: 10px;
      font-size: 1rem;
      border: 1px solid #ccc;
      border-radius: 5px;
    }
    form button {
      background-color: #3498db;
      color: white;
      border: none;
      cursor: pointer;
    }
    .success {
      color: green;
      font-size: 0.9rem;
    }
    .error {
      color: red;
      font-size: 0.9rem;
    }
    .tabs-container {
      background: #fff;
      padding: 2rem;
      border-radius: 16px;
      box-shadow: 0 8px 20px rgba(0,0,0,0.05);
    }
    .tabs {
      display: flex;
      justify-content: center;
      gap: 1rem;
      border-bottom: 2px solid #e0e0e0;
      margin-bottom: 2rem;
    }
    .tab-button {
      background: transparent;
      border: none;
      padding: 1rem 1.5rem;
      font-size: 1rem;
      font-weight: bold;
      cursor: pointer;
      transition: all 0.3s ease;
      border-bottom: 2px solid transparent;
      color: var(--secondary-color);
    }
    .tab-button:hover {
      color: var(--brand-purple);
    }
    .tab-button.active {
      color: var(--brand-purple);
      border-bottom: 2px solid var(--brand-purple);
    }
    .tab-content {
      display: none;
      text-align: center;
    }
    .tab-content.active {
      display: block;
    }
    .tab-content img {
      max-width: 100%;
      border-radius: 8px;
      margin-bottom: 1.5rem;
      box-shadow: 0 4px 10px rgba(0,0,0,0.1);
    }
    .tab-content .content-text h3 {
      font-size: 1.5rem;
      color: var(--brand-purple);
      margin-bottom: 0.5rem;
    }
    .tab-content .content-text p {
      font-size: 1rem;
      max-width: 800px;
      margin: 0 auto;
    }
    @media (max-width: 768px) {
      .tabs {
        flex-wrap: wrap;
      }
      .tab-button {
        flex: 1 1 45%;
        margin: 0.5rem 0;
      }
    }