* {
      margin: 0;
      padding: 0;
      box-sizing: border-box;
    }

    html {
      scroll-behavior: smooth;
    }

    body {
      font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
      line-height: 1.6;
      color: #2d3748;
      background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
      background-attachment: fixed;
    }

    /* Hero Header */
    .hero {
      background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
      color: white;
      padding: 4rem 2rem 3rem;
      text-align: center;
      box-shadow: 0 4px 6px rgba(0,0,0,0.1);
    }

    .hero-badge {
      display: inline-block;
      background: rgba(255,255,255,0.2);
      padding: 0.5rem 1rem;
      border-radius: 50px;
      font-size: 0.875rem;
      font-weight: 600;
      text-transform: uppercase;
      letter-spacing: 0.05em;
      margin-bottom: 1.5rem;
    }

    .hero h1 {
      font-size: 3rem;
      font-weight: 800;
      line-height: 1.2;
      margin-bottom: 1rem;
      text-shadow: 0 2px 4px rgba(0,0,0,0.1);
    }

    .hero-subtitle {
      font-size: 1.2rem;
      opacity: 0.95;
      font-weight: 500;
      max-width: 700px;
      margin: 0 auto;
      background-color: #ffffff;
      border-radius: 10px;
    }

    /* Main Container */
    .container {
      max-width: 1400px;
      margin: -2rem auto 4rem;
      padding: 0 2rem;
      display: flex;
      gap: 2rem;
      align-items: flex-start;
    }

    /* Progress Sidebar */
    .progress-sidebar {
      position: sticky;
      top: 2rem;
      width: 320px;
      background: white;
      border-radius: 12px;
      padding: 1.5rem;
      box-shadow: 0 4px 6px rgba(0,0,0,0.07);
    }

    .progress-title {
      font-size: 0.875rem;
      font-weight: 700;
      color: #667eea;
      text-transform: uppercase;
      letter-spacing: 0.05em;
      margin-bottom: 1.5rem;
      display: flex;
      align-items: center;
      gap: 0.5rem;
    }

    .progress-title::before {
      content: "📚";
      font-size: 1.25rem;
    }

    .progress-list {
      list-style: none;
      counter-reset: step;
    }

    .progress-list li {
      counter-increment: step;
      position: relative;
      padding-left: 2.5rem;
      padding-bottom: 1.5rem;
      border-left: 2px solid #e2e8f0;
      transition: all 0.3s;
    }

    .progress-list li:last-child {
      border-left-color: transparent;
      padding-bottom: 0;
    }

    .progress-list li::before {
      content: counter(step);
      position: absolute;
      left: -1rem;
      top: 0;
      width: 2rem;
      height: 2rem;
      background: white;
      border: 2px solid #e2e8f0;
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 700;
      font-size: 0.875rem;
      color: #a0aec0;
      transition: all 0.3s;
    }

    .progress-list li.active::before {
      background: #667eea;
      border-color: #667eea;
      color: white;
      transform: scale(1.1);
    }

    .progress-list li.active {
      border-left-color: #667eea;
    }

    .progress-list a {
      color: #4a5568;
      text-decoration: none;
      font-size: 0.9rem;
      font-weight: 500;
      transition: color 0.2s;
    }

    .progress-list li.active a {
      color: #667eea;
      font-weight: 600;
    }

    .progress-list a:hover {
      color: #667eea;
    }

    /* Sidebar Promo Card */

  .sidebar-promo {
    margin-top: 1rem;
    padding-top: 1rem;
    border-top: 2px dashed #e2e8f0;
    text-align: center;
  }

  .promo-icon {
    font-size: 2rem;
    margin-bottom: 0.1rem;
    animation: float 3s ease-in-out infinite;
  }

  .sidebar-promo h3 {
    font-size: 1rem;
    font-weight: 800;
    color: #2d3748;
    margin-bottom: 0.5rem;
    line-height: 1.2;
  }

  .sidebar-promo p {
    font-size: 0.85rem;
    color: #4a5568;
    line-height: 1.4;
    margin-bottom: 1rem;
  }

  .sidebar-promo strong {
    color: #667eea;
  }

  /* MAIN BUTTON STYLES */
  .promo-btn {
    display: block;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    text-decoration: none;
    padding: 0.75rem 0.5rem; /* Adjusted padding for two lines */
    border-radius: 8px;
    font-weight: 700;
    font-size: 1rem;
    transition: transform 0.2s, box-shadow 0.2s;
    box-shadow: 0 4px 6px rgba(102, 126, 234, 0.25);
    margin-bottom: 1rem;
  }

  .promo-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 12px rgba(102, 126, 234, 0.35);
    color: white;
  }

  .price-tag {
    background: rgba(255, 255, 255, 0.2);
    padding: 2px 8px;
    border-radius: 4px;
    margin-left: 5px;
    font-size: 0.9rem;
    text-decoration: none; /* Ensure no strikethrough on the new price */
  }

  .btn-subtext {
    display: block;
    font-size: 0.65rem;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    opacity: 0.9;
    margin-top: 4px;
    font-weight: 400;
  }

  /* STUDENT OFFER STYLES */
  .student-offer {
    background: #f7fafc;
    border: 1px solid #e2e8f0;
    border-radius: 8px;
    padding: 0.75rem;
    font-size: 0.8rem;
  }

  .student-offer strong {
    display: block;
    color: #2d3748;
    margin-bottom: 0.25rem;
  }

  .student-offer p {
    margin-bottom: 0;
    font-size: 0.75rem;
    color: #718096;
  }

  .student-icon {
    font-size: 1rem;
  }

  .highlight-80 {
    color: #e53e3e; /* Red color to highlight the big discount */
    font-weight: 800;
  }

  @keyframes float {
    0% { transform: translateY(0px); }
    50% { transform: translateY(-5px); }
    100% { transform: translateY(0px); }
  }

    /* Main Content */
    .content {
      flex: 1;
      max-width: 850px;
      background: white;
      border-radius: 12px;
      padding: 3rem;
      box-shadow: 0 4px 6px rgba(0,0,0,0.07);
    }

    /* Section Styling */
    section {
      margin-bottom: 4rem;
      scroll-margin-top: 2rem;
    }

    section:last-child {
      margin-bottom: 0;
    }

    /* Step Headers */
    .step-header {
      display: inline-flex;
      align-items: center;
      gap: 0.75rem;
      background: linear-gradient(135deg, #667eea, #764ba2);
      color: white;
      padding: 0.5rem 1.25rem;
      border-radius: 50px;
      font-size: 0.875rem;
      font-weight: 700;
      margin-bottom: 1.5rem;
      text-transform: uppercase;
      letter-spacing: 0.05em;
    }

    h2 {
      font-size: 2.25rem;
      font-weight: 800;
      color: #1a202c;
      margin-bottom: 1rem;
      line-height: 1.3;
    }

    h3 {
      font-size: 1.5rem;
      font-weight: 700;
      color: #2d3748;
      margin: 2.5rem 0 1rem;
      display: flex;
      align-items: center;
      gap: 0.5rem;
    }

    h3::before {
      content: "▸";
      color: #667eea;
      font-size: 1.25rem;
    }

    p {
      margin-bottom: 1.5rem;
      font-size: 1.0625rem;
      color: #4a5568;
      line-height: 1.75;
    }

    /* Info Boxes */
    .info-box {
      background: linear-gradient(135deg, #f0f4ff 0%, #e6efff 100%);
      border-left: 4px solid #667eea;
      padding: 1.5rem;
      border-radius: 8px;
      margin: 2rem 0;
    }

    .info-box-title {
      font-weight: 700;
      color: #667eea;
      margin-bottom: 0.75rem;
      font-size: 1.0625rem;
      display: flex;
      align-items: center;
      gap: 0.5rem;
    }

    .info-box-title::before {
      content: "💡";
      font-size: 1.25rem;
    }

    .info-box p:last-child {
      margin-bottom: 0;
    }

    /* Success Box */
    .success-box {
      background: linear-gradient(135deg, #f0fdf4 0%, #dcfce7 100%);
      border-left: 4px solid #10b981;
    }

    .success-box .info-box-title {
      color: #10b981;
    }

    .success-box .info-box-title::before {
      content: "✓";
    }

    /* Lists */
    ul, ol {
      margin: 1.5rem 0;
      padding-left: 2rem;
    }

    li {
      margin-bottom: 0.75rem;
      font-size: 1.0625rem;
      color: #4a5568;
      line-height: 1.7;
    }

    li::marker {
      color: #667eea;
      font-weight: 700;
    }

    /* Code Blocks */
    pre {
      background: #1e293b;
      border-radius: 12px;
      padding: 1.5rem;
      overflow-x: auto;
      margin: 2rem 0;
      box-shadow: 0 10px 30px rgba(0,0,0,0.2);
      position: relative;
    }

    pre::before {
      content: "";
      position: absolute;
      top: 0;
      left: 0;
      right: 0;
      height: 2.5rem;
      background: #0f172a;
      border-radius: 12px 12px 0 0;
      border-bottom: 1px solid #334155;
    }

    pre::after {
      content: "";
      position: absolute;
      top: 0.75rem;
      left: 1rem;
      width: 12px;
      height: 12px;
      border-radius: 50%;
      background: #ef4444;
      box-shadow: 20px 0 0 #f59e0b, 40px 0 0 #10b981;
    }

    code {
      font-family: 'SF Mono', 'Monaco', 'Inconsolata', 'Consolas', monospace;
      font-size: 0.875rem;
      line-height: 1.7;
      color: #e2e8f0;
    }

    pre code {
      display: block;
      margin-top: 2.5rem;
      counter-reset: line;
    }

    pre code .line {
      display: block;
      padding-left: 3.5rem;
      position: relative;
    }

    pre code .line::before {
      counter-increment: line;
      content: counter(line);
      position: absolute;
      left: 0;
      width: 2.5rem;
      text-align: right;
      color: #64748b;
      user-select: none;
      padding-right: 1rem;
      font-size: 0.8125rem;
    }

    /* Inline code */
    p code, li code {
      background: #f1f5f9;
      color: #e11d48;
      padding: 0.2rem 0.5rem;
      border-radius: 4px;
      font-size: 0.9em;
      font-family: 'SF Mono', 'Monaco', 'Consolas', monospace;
      font-weight: 600;
    }

    /* Links */
    a {
      color: #667eea;
      text-decoration: none;
      font-weight: 600;
      transition: color 0.2s;
    }

    a:hover {
      color: #764ba2;
      text-decoration: underline;
    }

    /* Responsive */
    @media (max-width: 1024px) {
      .container {
        flex-direction: column-reverse;
      }

      .progress-sidebar {
        position: relative;
        top: 0;
        width: 100%;
      }

      .progress-list {
        display: grid;
        grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
        gap: 1rem;
      }

      .progress-list li {
        border-left: none;
        border-bottom: 2px solid #e2e8f0;
        padding-left: 0;
        padding-bottom: 1rem;
      }

      .progress-list li::before {
        position: static;
        margin-bottom: 0.5rem;
      }
    }

    @media (max-width: 640px) {
      .hero h1 {
        font-size: 2rem;
      }

      .hero-subtitle {
        font-size: 1.0625rem;
      }

      .content {
        padding: 2rem 1.5rem;
      }

      h2 {
        font-size: 1.75rem;
      }

      h3 {
        font-size: 1.25rem;
      }

      .progress-list {
        grid-template-columns: 1fr;
      }
    }

:root {
            --bar-bg: #000000;
            --bar-border: #374151;
            --text-white: #ffffff;
            --text-gray: #94a3b8; /* slate-400 */
            --btn-color: #7c3aed; /* violet-600 */
            --btn-hover: #6d28d9; /* violet-700 */
            --input-border: #d1d5db;
        }

        /* * Main Container 
         * Re-styled as a floating chat panel
         */
        .sticky-sub-bar {
            position: fixed;
            bottom: 20px;
            right: 20px;
            width: 320px; /* Fixed width for chat panel look */
            background-color: var(--bar-bg);
            border: 1px solid var(--bar-border);
            border-radius: 12px;
            padding: 1.25rem;
            z-index: 50;
            box-shadow: 0 10px 25px -5px rgba(0, 0, 0, 0.5), 0 8px 10px -6px rgba(0, 0, 0, 0.5);
            
            /* Animation Handling */
            transform: translateY(0) scale(1);
            opacity: 1;
            transition: all 300ms cubic-bezier(0.16, 1, 0.3, 1);
        }

        /* Helper class to hide the bar */
        .sticky-sub-bar.is-hidden {
            transform: translateY(20px) scale(0.95);
            opacity: 0;
            pointer-events: none;
        }

        /* * Content Wrapper */
        .sticky-content {
            display: flex;
            flex-direction: column;
            gap: 1rem;
        }

        /* * Text Section */
        .sticky-text-group {
            text-align: left;
            padding-right: 20px; /* Space for close button */
        }

        .sticky-headline {
            color: var(--text-white);
            font-size: 0.95rem; 
            font-weight: 700;
            margin: 0;
            display: flex;
            align-items: center;
            gap: 0.5rem;
            line-height: 1.25;
        }

        .sticky-subtext {
            color: var(--text-gray);
            font-size: 0.8rem;
            margin-top: 0.5rem;
            line-height: 1.4;
        }

        /* * Form Styles */
        .sticky-form {
            display: flex;
            flex-direction: column; /* Stacked for tight vertical layout */
            gap: 0.75rem;
            width: 100%;
        }

        .sticky-input {
            width: 100%;
            box-sizing: border-box; /* Ensure padding doesn't overflow width */
            padding: 10px 12px;
            border: 1px solid var(--input-border);
            border-radius: 6px;
            font-size: 0.9rem;
            color: #111827;
            background-color: #ffffff;
            outline: none;
        }

        .sticky-btn {
            background-color: var(--btn-color);
            color: white;
            padding: 10px 16px;
            border-radius: 6px;
            text-decoration: none;
            font-weight: 600;
            font-size: 0.9rem;
            border: none;
            cursor: pointer;
            transition: background-color 0.3s ease;
            width: 100%; /* Full width button */
            text-align: center;
        }

        .sticky-btn:hover {
            background-color: var(--btn-hover);
        }

        /* * Close Button */
        .sticky-close-btn {
            position: absolute;
            top: 10px;
            right: 10px;
            background: rgba(255, 255, 255, 0.1);
            border-radius: 50%;
            border: none;
            color: #94a3b8;
            width: 24px;
            height: 24px;
            padding: 0;
            cursor: pointer;
            transition: all 0.2s;
            display: flex;
            align-items: center;
            justify-content: center;
        }

        .sticky-close-btn:hover {
            background: rgba(255, 255, 255, 0.2);
            color: white;
        }