/* Tổng thể */
    .page-go99 {
      font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
      color: #333;
      line-height: 1.6;
      background-color: #f8f8f8;
      padding-bottom: 80px; /* Đủ khoảng trống cho nút nổi */
    }

    .page-go99__container {
      max-width: 1200px;
      margin: 0 auto;
      padding: 0 15px;
      box-sizing: border-box;
    }

    /* Tiêu đề chung */
    .page-go99 h1, .page-go99 h2, .page-go99 h3 {
      color: #2c3e50;
      text-align: center;
      margin-bottom: 25px;
      font-weight: bold;
    }

    .page-go99 h1 {
      font-size: 2.5em;
      color: #e74c3c;
      margin-top: 0;
    }

    .page-go99 h2 {
      font-size: 2em;
      color: #c0392b;
      padding-top: 20px;
    }

    .page-go99 h3 {
      font-size: 1.5em;
      color: #d35400;
    }

    /* Nút hành động chung */
    .page-go99__button {
      display: block;
      width: fit-content;
      margin: 25px auto;
      padding: 15px 30px;
      background-color: #e74c3c;
      color: #fff;
      text-decoration: none;
      border-radius: 8px;
      font-size: 1.1em;
      font-weight: bold;
      text-align: center;
      transition: background-color 0.3s ease, transform 0.3s ease;
      cursor: pointer;
      border: none;
      box-shadow: 0 4px 10px rgba(0, 0, 0, 0.2);
    }

    .page-go99__button:hover {
      background-color: #c0392b;
      transform: translateY(-2px);
    }

    /* Hero Section */
    .page-go99__hero-section {
      position: relative;
      text-align: center;
      color: #fff;
      padding: 60px 0 40px; /* Mobile padding-top */
      overflow: hidden;
      background: linear-gradient(135deg, #e74c3c 0%, #c0392b 100%);
      box-shadow: 0 5px 15px rgba(0, 0, 0, 0.2);
    }
    
    .page-go99__hero-section::before {
      content: '';
      position: absolute;
      top: 0;
      left: 0;
      width: 100%;
      height: 100%;
      background: rgba(0, 0, 0, 0.4); /* Lớp phủ mờ */
      z-index: 1;
    }

    .page-go99__hero-content {
      position: relative;
      z-index: 2;
      max-width: 900px;
      margin: 0 auto;
      padding: 0 15px;
    }

    .page-go99__hero-image {
      position: absolute;
      top: 0;
      left: 0;
      width: 100%;
      height: 100%;
      object-fit: cover;
      z-index: 0;
    }

    .page-go99__hero-title {
      font-size: 2.8em;
      margin-bottom: 15px;
      color: #fff;
      text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.7);
    }

    .page-go99__hero-description {
      font-size: 1.2em;
      margin-bottom: 30px;
      color: #f0f0f0;
      text-shadow: 1px 1px 3px rgba(0, 0, 0, 0.5);
    }

    /* Nút nổi đăng nhập */
    .page-go99__floating-button {
      position: fixed;
      bottom: 20px;
      right: 20px;
      z-index: 1000;
      background-color: #28a745; /* Màu xanh lá cây nổi bật */
      color: #fff;
      padding: 15px 25px;
      border-radius: 50px;
      text-decoration: none;
      font-size: 1.1em;
      font-weight: bold;
      box-shadow: 0 6px 15px rgba(0, 0, 0, 0.3);
      transition: background-color 0.3s ease, transform 0.3s ease;
      animation: page-go99__pulse 2s infinite;
      text-align: center;
      max-width: calc(100% - 40px); /* Đảm bảo không tràn màn hình */
      box-sizing: border-box;
    }

    .page-go99__floating-button:hover {
      background-color: #218838;
      transform: scale(1.05);
    }

    @keyframes page-go99__pulse {
      0% { transform: scale(1); }
      50% { transform: scale(1.03); }
      100% { transform: scale(1); }
    }

    /* Giới thiệu */
    .page-go99__intro-section {
      background-color: #fff;
      padding: 40px 0;
      margin-bottom: 30px;
      box-shadow: 0 2px 10px rgba(0, 0, 0, 0.05);
      border-radius: 8px;
    }

    .page-go99__intro-content {
      text-align: center;
      font-size: 1.1em;
    }

    /* Các tính năng nổi bật */
    .page-go99__features-section {
      padding: 40px 0;
      background-color: #f0f0f0;
      margin-bottom: 30px;
      border-radius: 8px;
    }

    .page-go99__features-grid {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
      gap: 30px;
      margin-top: 30px;
    }

    .page-go99__feature-item {
      background-color: #fff;
      padding: 25px;
      border-radius: 8px;
      box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
      text-align: center;
      transition: transform 0.3s ease, box-shadow 0.3s ease;
    }

    .page-go99__feature-item:hover {
      transform: translateY(-5px);
      box-shadow: 0 6px 15px rgba(0, 0, 0, 0.15);
    }

    .page-go99__feature-image { /* Đổi từ icon sang image để phù hợp yêu cầu kích thước */
      width: 120px; /* Đảm bảo kích thước tối thiểu 200x200 */
      height: 120px;
      margin: 0 auto 15px;
      object-fit: contain;
      max-width: 100%;
    }

    .page-go99__feature-title {
      font-size: 1.3em;
      color: #34495e;
      margin-bottom: 10px;
    }

    .page-go99__feature-description {
      font-size: 0.95em;
      color: #555;
    }

    /* Danh mục trò chơi */
    .page-go99__games-section {
      padding: 40px 0;
      margin-bottom: 30px;
      background-color: #fff;
      border-radius: 8px;
    }

    .page-go99__games-grid {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
      gap: 25px;
      margin-top: 30px;
    }

    .page-go99__game-card {
      background-color: #f9f9f9;
      border-radius: 8px;
      overflow: hidden;
      box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
      transition: transform 0.3s ease, box-shadow 0.3s ease;
      text-align: center;
      padding-bottom: 20px;
    }

    .page-go99__game-card:hover {
      transform: translateY(-5px);
      box-shadow: 0 6px 15px rgba(0, 0, 0, 0.15);
    }

    .page-go99__game-image {
      width: 100%;
      height: 180px;
      object-fit: cover;
      max-width: 100%;
    }

    .page-go99__game-title {
      font-size: 1.4em;
      color: #2c3e50;
      margin: 15px 0 10px;
      padding: 0 10px;
    }

    .page-go99__game-description {
      font-size: 0.9em;
      color: #666;
      padding: 0 15px;
    }

    /* Tải ứng dụng */
    .page-go99__download-section {
      background-color: #f0f0f0;
      padding: 40px 0;
      margin-bottom: 30px;
      border-radius: 8px;
    }

    .page-go99__download-content {
      display: flex;
      flex-direction: column;
      align-items: center;
      gap: 30px;
    }

    .page-go99__download-text {
      text-align: center;
      max-width: 600px;
    }

    .page-go99__download-image {
      width: 250px;
      height: auto;
      max-width: 100%;
    }

    .page-go99__download-buttons {
      display: flex;
      flex-wrap: wrap;
      justify-content: center;
      gap: 20px;
    }

    .page-go99__download-button {
      background-color: #3498db;
      padding: 12px 25px;
      font-size: 1em;
      border-radius: 5px;
      box-shadow: 0 3px 8px rgba(0, 0, 0, 0.2);
    }

    .page-go99__download-button:hover {
      background-color: #2980b9;
    }

    /* Khuyến mãi */
    .page-go99__promo-section {
      background-color: #fff;
      padding: 40px 0;
      margin-bottom: 30px;
      border-radius: 8px;
    }

    .page-go99__promo-grid {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
      gap: 30px;
      margin-top: 30px;
    }

    .page-go99__promo-card {
      background-color: #f9f9f9;
      border-radius: 8px;
      box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
      padding: 25px;
      text-align: center;
      transition: transform 0.3s ease, box-shadow 0.3s ease;
    }

    .page-go99__promo-card:hover {
      transform: translateY(-5px);
      box-shadow: 0 6px 15px rgba(0, 0, 0, 0.15);
    }

    .page-go99__promo-image { /* Đổi từ icon sang image để phù hợp yêu cầu kích thước */
      width: 120px; /* Đảm bảo kích thước tối thiểu 200x200 */
      height: 120px;
      margin: 0 auto 15px;
      object-fit: contain;
      max-width: 100%;
    }

    .page-go99__promo-title {
      font-size: 1.4em;
      color: #d35400;
      margin-bottom: 10px;
    }

    .page-go99__promo-description {
      font-size: 0.95em;
      color: #555;
      margin-bottom: 20px;
    }

    /* Hướng dẫn */
    .page-go99__guide-section {
      padding: 40px 0;
      background-color: #f0f0f0;
      margin-bottom: 30px;
      border-radius: 8px;
    }

    .page-go99__guide-steps {
      display: flex;
      flex-direction: column;
      gap: 25px;
      margin-top: 30px;
    }

    .page-go99__guide-step {
      background-color: #fff;
      padding: 20px;
      border-left: 5px solid #e74c3c;
      border-radius: 5px;
      box-shadow: 0 2px 8px rgba(0, 0, 0, 0.08);
    }

    .page-go99__guide-step-title {
      font-size: 1.2em;
      color: #2c3e50;
      margin-bottom: 10px;
      display: flex;
      align-items: center;
    }

    .page-go99__guide-step-title::before {
      content: counter(step-counter);
      counter-increment: step-counter;
      background-color: #e74c3c;
      color: #fff;
      width: 30px;
      height: 30px;
      border-radius: 50%;
      display: flex;
      justify-content: center;
      align-items: center;
      font-weight: bold;
      margin-right: 15px;
      flex-shrink: 0;
    }

    .page-go99__guide-step-description {
      color: #555;
      margin-left: 45px; /* Căn chỉnh với văn bản tiêu đề */
    }

    /* Hỗ trợ khách hàng */
    .page-go99__support-section {
      background-color: #fff;
      padding: 40px 0;
      margin-bottom: 30px;
      border-radius: 8px;
      text-align: center;
    }

    .page-go99__support-info {
      font-size: 1.1em;
      color: #444;
      margin-bottom: 20px;
    }

    .page-go99__support-channel {
      display: flex;
      align-items: center;
      justify-content: center;
      margin-bottom: 10px;
      font-weight: bold;
    }

    .page-go99__support-image { /* Đổi từ icon sang image để phù hợp yêu cầu kích thước */
      width: 60px; /* Đảm bảo kích thước tối thiểu 200x200 */
      height: 60px;
      margin-right: 10px;
      object-fit: contain;
      max-width: 100%;
    }

    /* FAQ Section */
    .page-go99__faq-section {
      background-color: #f0f0f0;
      padding: 40px 0;
      border-radius: 8px;
    }

    .page-go99__faq-list {
      margin-top: 30px;
    }

    .page-go99__faq-item {
      background-color: #fff;
      border-radius: 8px;
      margin-bottom: 15px;
      box-shadow: 0 2px 8px rgba(0, 0, 0, 0.08);
      overflow: hidden;
    }

    .page-go99__faq-question {
      display: flex;
      justify-content: space-between;
      align-items: center;
      padding: 15px 20px;
      cursor: pointer;
      background-color: #e74c3c;
      color: #fff;
      font-size: 1.1em;
      font-weight: bold;
      border-radius: 8px;
      transition: background-color 0.3s ease;
      user-select: none;
    }

    .page-go99__faq-question:hover {
      background-color: #c0392b;
    }

    .page-go99__faq-question h3 {
        margin: 0;
        color: #fff;
        text-align: left;
        flex-grow: 1;
        pointer-events: none; /* Prevent h3 from blocking click */
    }

    .page-go99__faq-toggle {
      font-size: 1.5em;
      line-height: 1;
      margin-left: 15px;
      transition: transform 0.3s ease;
      pointer-events: none; /* Prevent toggle icon from blocking click */
    }

    .page-go99__faq-item.active .page-go99__faq-toggle {
      transform: rotate(45deg); /* Change '+' to 'x' or '-' */
    }

    .page-go99__faq-answer {
      max-height: 0;
      overflow: hidden;
      padding: 0 20px;
      background-color: #fefefe;
      color: #333;
      transition: max-height 0.4s cubic-bezier(0.4, 0, 0.2, 1), padding 0.4s ease, opacity 0.4s ease;
      opacity: 0;
    }

    .page-go99__faq-item.active .page-go99__faq-answer {
      max-height: 2000px !important; /* Sufficiently large */
      padding: 20px !important;
      opacity: 1;
    }
    
    .page-go99__faq-answer p {
        margin-top: 0;
        margin-bottom: 0;
    }


    /* Responsive */
    @media (max-width: 768px) {
      .page-go99__hero-section {
        padding-top: 60px; /* Mobile padding-top for fixed header */
        padding-bottom: 30px;
      }

      .page-go99__hero-title {
        font-size: 2em;
      }

      .page-go99__hero-description {
        font-size: 1em;
      }

      .page-go99 h1 {
        font-size: 2em;
      }

      .page-go99 h2 {
        font-size: 1.6em;
      }

      .page-go99 h3 {
        font-size: 1.3em;
      }

      .page-go99__button {
        padding: 12px 20px;
        font-size: 1em;
      }

      .page-go99__floating-button {
        bottom: 15px;
        right: 15px;
        padding: 12px 20px;
        font-size: 0.9em;
      }

      .page-go99__features-grid,
      .page-go99__games-grid,
      .page-go99__promo-grid {
        grid-template-columns: 1fr;
        gap: 20px;
      }

      .page-go99__download-content {
        flex-direction: column;
      }

      .page-go99__download-image {
        width: 200px;
      }

      .page-go99__download-buttons {
        flex-direction: column;
        gap: 15px;
      }
      
      .page-go99__download-button {
        width: 80%;
        max-width: 250px;
      }

      /* List items responsive rules */
      .page-go99__features-grid > .page-go99__feature-item,
      .page-go99__games-grid > .page-go99__game-card,
      .page-go99__promo-grid > .page-go99__promo-card,
      .page-go99__guide-steps > .page-go99__guide-step,
      .page-go99__faq-list > .page-go99__faq-item {
        width: 100% !important;
        max-width: 100% !important;
        box-sizing: border-box !important;
        margin-left: 0 !important;
        margin-right: 0 !important;
        padding-left: 15px; /* Adjust padding to fit screen */
        padding-right: 15px;
        word-wrap: break-word !important;
        overflow-wrap: break-word !important;
        word-break: break-word !important;
      }

      .page-go99__features-grid,
      .page-go99__games-grid,
      .page-go99__promo-grid,
      .page-go99__guide-steps,
      .page-go99__faq-list {
        width: 100% !important;
        max-width: 100% !important;
        box-sizing: border-box !important;
        padding: 0 15px !important; /* Ensure container padding is adjusted */
        margin-left: 0 !important;
        margin-right: 0 !important;
      }
      
      .page-go99__faq-answer {
          padding: 15px !important; /* Adjusted for mobile */
      }
      
      .page-go99__faq-item.active .page-go99__faq-answer {
          padding: 15px !important; /* Adjusted for mobile */
      }
      
      .page-go99__faq-question {
          padding: 12px 15px;
          font-size: 1em;
      }
      
      .page-go99__guide-step-title {
          font-size: 1.1em;
      }
      
      .page-go99__guide-step-description {
          margin-left: 0 !important; /* Remove indent on mobile for better readability */
          padding-left: 45px !important; /* Adjust padding to align with number */
      }
    }

    @media (min-width: 769px) {
      .page-go99__hero-section {
        padding-top: 80px; /* Desktop padding-top for fixed header */
      }
    }
    
    /* Image responsive default */
    .page-go99 img {
        max-width: 100%;
        height: auto;
        display: block; /* Remove extra space below images */
    }