.section-button {
    display: block;
    width: 100%;
    background-color: #e0b9b9;
    border: 1px solid #ccc;
    color: #333;
    padding: 12px;
    margin: 6px 0;
    text-align: center;
    text-decoration: none;
    font-size: 20px;       /* Increased text size */
    font-weight: bold;     /* Bold text */
    border-radius: 6px;
    transition: background-color 0.3s, color 0.3s;
}

.section-button:hover {
    color: white;
    border-color: #005f8d;
}

  
    
      
    .center-button {
    text-align: center;
    margin-bottom: 20px;
}

.custom-button {
    display: inline-block;
    background-color: #ffffff;
    color: #000000;
    padding: 12px 24px;
    text-decoration: none;
    border-radius: 6px;
    font-size: 16px;
    transition: background-color 0.3s ease;
}

.custom-button:hover {
    background-color: #000000;
}

    
    /* === GLOBAL STYLES === */
    * {
      margin: 0;
      padding: 0;
      box-sizing: border-box;
    }

    html, body {
      font-family: Arial, sans-serif;
      background-color: #f9f9f9;
      overflow-x: hidden;
      user-select: none;
      display: flex;
      flex-direction: column;
      min-height: 100vh;
      margin: 0;
    }

    a {
      text-decoration: none;
    }

    .wrapper {
      flex: 1;
    }

    /* === HEADER === */
    .site-header {
      background: url('header-bg.jpg') no-repeat center center;
      background-size: cover;
      padding: 20px;
      text-align: center;
      color: white;
    }

    .page-title a {
      font-size: 36px;
      font-weight: bold;
      color: #ffffff;
      text-shadow: 1px 1px 2px #000;
    }

    .page-title a:hover {
      color: #ffd700;
    }

    .header-buttons {
      margin-top: 10px;
    }

    .header-buttons button {
      padding: 10px 20px;
      margin: 5px;
      font-size: 16px;
      cursor: pointer;
      background-color: #ffffff;
      color: #333;
      border: none;
      border-radius: 4px;
      transition: background 0.3s;
    }

    .header-buttons button:hover {
      background-color: #eaeaea;
    }

    .header-description {
      margin-top: 10px;
      font-size: 16px;
      color: #f2f2f2;
    }

    /* === MAIN CONTENT === */
    .table-container {
      padding: 20px;
    }

    #lessonButtonsContainer {
      max-width: 600px;
      margin: 0 auto;
      display: flex;
      flex-direction: column;
      gap: 10px;
      position: relative;
      background-color: #fff;
      z-index: 1;
    }

    /* Watermark logo */
    #lessonButtonsContainer::before {
      content: "";
      background: url('logo.png') no-repeat center center;
      background-size: 180px;
      position: absolute;
      top: 100px;
      left: 0;
      right: 0;
      bottom: 0;
      opacity: 0.07;
      z-index: 0;
      pointer-events: none;
    }

    #lessonButtonsContainer a {
      font-size: 16px;
      color: #0073aa;
      margin: 5px 0;
      z-index: 1;
      position: relative;
    }

    #lessonButtonsContainer a:hover {
      text-decoration: underline;
    }

    /* Collapsible sections */
    .section {
      border: 1px solid #ccc;
      border-radius: 6px;
      overflow: hidden;
      background: #fff;
    }

    .section-header {
      background-color: #f0f0f0;
      padding: 14px;
      font-weight: bold;
      cursor: pointer;
      transition: background 0.3s;
    }

    .section-header:hover {
      background-color: #e2e2e2;
    }

    .section-content {
      display: none;
      padding: 10px 20px;
    }

    .section-content a {
      display: block;
      margin: 8px 0;
    }

    /* Info title */
    h2 {
      text-align: center;
      font-size: 28px;
      color: #333;
      text-transform: uppercase;
      letter-spacing: 1px;
      border-bottom: 2px solid #ccc;
      padding-bottom: 10px;
      width: 60%;
      margin: 40px auto 20px auto;
      z-index: 1;
      position: relative;
    }

    /* === FOOTER === */
    .footer {
        background-color: #6598d6;
        padding: 15px;
        text-align: center;
        font-size: 14px;
        color: #000000;
        margin-top: 40px;
        border-top: 1px solid #ddd;
        font-weight: bold;
    }

    /* === MOBILE STYLES === */
    @media (max-width: 600px) {
      .page-title a {
        font-size: 24px;
      }

      .header-buttons button {
        padding: 8px 12px;
        font-size: 14px;
      }

      #lessonButtonsContainer {
        padding: 10px;
      }

      h2 {
        font-size: 20px;
        width: 90%;
      }
    }