/* Tổng quan */
    :root {
      --page-88online4-primary-color: #e44d26; /* Cam đỏ */
      --page-88online4-secondary-color: #f7931e; /* Cam */
      --page-88online4-accent-color: #007bff; /* Xanh dương */
      --page-88online4-text-color: #333;
      --page-88online4-light-text-color: #f0f0f0;
      --page-88online4-background-color: #f9f9f9;
      --page-88online4-card-background: #ffffff;
      --page-88online4-border-color: #ddd;
      --page-88online4-border-radius: 8px;
      --page-88online4-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
      --page-88online4-transition: all 0.3s ease;
    }

    .page-88online4 {
      font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
      line-height: 1.6;
      color: var(--page-88online4-text-color);
      background-color: var(--page-88online4-background-color);
      padding: 0;
      margin: 0;
      overflow-x: hidden;
    }

    .page-88online4__container {
      max-width: 1200px;
      margin: 0 auto;
      padding: 20px;
      box-sizing: border-box;
    }

    /* Tiêu đề chung */
    .page-88online4__section-title {
      font-size: 2.5em;
      color: var(--page-88online4-primary-color);
      text-align: center;
      margin-bottom: 40px;
      position: relative;
      padding-bottom: 15px;
    }

    .page-88online4__section-title::after {
      content: '';
      position: absolute;
      left: 50%;
      bottom: 0;
      transform: translateX(-50%);
      width: 80px;
      height: 4px;
      background-color: var(--page-88online4-secondary-color);
      border-radius: 2px;
    }

    /* Hero Section */
    .page-88online4__hero-section {
      position: relative;
      width: 100%;
      min-height: 450px;
      display: flex;
      align-items: center;
      justify-content: center;
      text-align: center;
      color: var(--page-88online4-light-text-color);
      overflow: hidden;
      padding-top: 10px; /* Adjust for fixed header */
      box-sizing: border-box;
    }

    .page-88online4__banner-image {
      position: absolute;
      top: 0;
      left: 0;
      width: 100%;
      height: 100%;
      object-fit: cover;
      z-index: -1;
      filter: brightness(0.7); /* Để chữ dễ đọc hơn */
      max-width: 100%;
    }

    .page-88online4__hero-content {
      position: relative;
      z-index: 1;
      max-width: 900px;
      padding: 20px;
      background-color: rgba(0, 0, 0, 0.5);
      border-radius: var(--page-88online4-border-radius);
      margin-top: 10px; /* Để banner không bị đẩy xuống quá nhiều */
    }

    .page-88online4__title {
      font-size: 3.2em;
      margin-bottom: 15px;
      line-height: 1.2;
      color: #fff;
      word-wrap: break-word; /* Ensure long titles wrap */
    }

    .page-88online4__subtitle {
      font-size: 1.3em;
      margin-bottom: 30px;
      max-width: 700px;
      margin-left: auto;
      margin-right: auto;
      color: #ccc;
    }

    /* Nút nổi đăng nhập */
    .page-88online4__floating-button-container {
      position: fixed;
      bottom: 20px;
      left: 50%;
      transform: translateX(-50%);
      z-index: 1000;
      width: 90%;
      max-width: 350px;
      text-align: center;
      box-sizing: border-box;
    }

    .page-88online4__promo-button {
      display: block;
      width: 100%;
      padding: 15px 25px;
      background: linear-gradient(90deg, var(--page-88online4-primary-color) 0%, var(--page-88online4-secondary-color) 100%);
      color: var(--page-88online4-light-text-color);
      font-size: 1.2em;
      font-weight: bold;
      border: none;
      border-radius: 50px;
      cursor: pointer;
      box-shadow: var(--page-88online4-shadow);
      transition: var(--page-88online4-transition);
      text-decoration: none;
    }

    .page-88online4__promo-button:hover {
      background: linear-gradient(90deg, var(--page-88online4-secondary-color) 0%, var(--page-88online4-primary-color) 100%);
      transform: translateY(-3px);
    }

    /* Các phần nội dung */
    .page-88online4__section {
      padding: 60px 0;
      background-color: var(--page-88online4-background-color);
    }

    .page-88online4__section:nth-of-type(odd) {
      background-color: #fff;
    }

    /* Lưới tính năng */
    .page-88online4__features-grid {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
      gap: 30px;
      margin-top: 40px;
    }

    .page-88online4__feature-item {
      background-color: var(--page-88online4-card-background);
      padding: 30px;
      border-radius: var(--page-88online4-border-radius);
      box-shadow: var(--page-88online4-shadow);
      text-align: center;
      transition: var(--page-88online4-transition);
      display: flex;
      flex-direction: column;
      align-items: center;
    }

    .page-88online4__feature-item:hover {
      transform: translateY(-10px);
      box-shadow: 0 8px 20px rgba(0, 0, 0, 0.15);
    }

    .page-88online4__feature-icon {
      width: 100px; /* Kích thước tối thiểu cho hình ảnh */
      height: 100px;
      margin-bottom: 20px;
      object-fit: contain;
      max-width: 100%;
      height: auto;
    }

    .page-88online4__feature-item h3 {
      font-size: 1.5em;
      color: var(--page-88online4-primary-color);
      margin-bottom: 15px;
      word-wrap: break-word;
    }

    .page-88online4__feature-item p {
      font-size: 1em;
      color: #666;
      word-wrap: break-word;
    }

    /* Danh sách bước */
    .page-88online4__steps-list {
      display: flex;
      flex-direction: column;
      gap: 25px;
      counter-reset: step-counter;
      list-style: none;
      padding: 0;
      margin-top: 40px;
      width: 100%; /* Ensure container takes full width */
      max-width: 100%;
      box-sizing: border-box;
      margin-left: 0;
      margin-right: 0;
    }

    .page-88online4__step-item {
      background-color: var(--page-88online4-card-background);
      padding: 25px 30px;
      border-radius: var(--page-88online4-border-radius);
      box-shadow: var(--page-88online4-shadow);
      display: flex;
      align-items: flex-start;
      position: relative;
      width: 100%; /* Ensure item takes full width */
      box-sizing: border-box;
    }

    .page-88online4__step-item::before {
      counter-increment: step-counter;
      content: counter(step-counter);
      background-color: var(--page-88online4-primary-color);
      color: var(--page-88online4-light-text-color);
      border-radius: 50%;
      width: 40px;
      height: 40px;
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: bold;
      font-size: 1.2em;
      flex-shrink: 0;
      margin-right: 20px;
    }

    .page-88online4__step-description h3 {
      font-size: 1.4em;
      color: var(--page-88online4-primary-color);
      margin-top: 0;
      margin-bottom: 10px;
      word-wrap: break-word;
    }

    .page-88online4__step-description p {
      font-size: 1em;
      color: #666;
      word-wrap: break-word;
    }

    /* Thư viện trò chơi */
    .page-88online4__game-gallery {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
      gap: 30px;
      margin-top: 40px;
    }

    .page-88online4__game-card {
      background-color: var(--page-88online4-card-background);
      border-radius: var(--page-88online4-border-radius);
      box-shadow: var(--page-88online4-shadow);
      overflow: hidden;
      text-align: center;
      transition: var(--page-88online4-transition);
      display: flex;
      flex-direction: column;
    }

    .page-88online4__game-card:hover {
      transform: translateY(-5px);
      box-shadow: 0 6px 15px rgba(0, 0, 0, 0.12);
    }

    .page-88online4__game-image {
      width: 100%;
      height: 200px;
      object-fit: cover;
      max-width: 100%;
    }

    .page-88online4__game-title {
      font-size: 1.3em;
      color: var(--page-88online4-primary-color);
      padding: 15px;
      word-wrap: break-word;
    }

    /* Thẻ khuyến mãi */
    .page-88online4__promo-grid {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
      gap: 30px;
      margin-top: 40px;
    }

    .page-88online4__promo-card {
      background-color: var(--page-88online4-card-background);
      border-radius: var(--page-88online4-border-radius);
      box-shadow: var(--page-88online4-shadow);
      overflow: hidden;
      text-align: left;
      transition: var(--page-88online4-transition);
      display: flex;
      flex-direction: column;
    }

    .page-88online4__promo-card:hover {
      transform: translateY(-5px);
      box-shadow: 0 6px 15px rgba(0, 0, 0, 0.12);
    }

    .page-88online4__promo-image {
      width: 100%;
      height: 180px;
      object-fit: cover;
      max-width: 100%;
    }

    .page-88online4__promo-content {
      padding: 20px;
    }

    .page-88online4__promo-title {
      font-size: 1.4em;
      color: var(--page-88online4-primary-color);
      margin-top: 0;
      margin-bottom: 10px;
      word-wrap: break-word;
    }

    .page-88online4__promo-description {
      font-size: 0.95em;
      color: #666;
      word-wrap: break-word;
    }

    /* FAQ */
    .page-88online4__faq-section {
      padding: 60px 0;
      background-color: var(--page-88online4-background-color);
    }

    .page-88online4__faq-list {
      max-width: 800px;
      margin: 40px auto 0 auto;
      list-style: none;
      padding: 0;
      width: 100%;
      max-width: 100%;
      box-sizing: border-box;
      margin-left: 0;
      margin-right: 0;
    }

    .page-88online4__faq-item {
      background-color: var(--page-88online4-card-background);
      margin-bottom: 15px;
      border-radius: var(--page-88online4-border-radius);
      box-shadow: var(--page-88online4-shadow);
      overflow: hidden;
      border: 1px solid var(--page-88online4-border-color);
      width: 100%;
      box-sizing: border-box;
    }

    .page-88online4__faq-question {
      display: flex;
      justify-content: space-between;
      align-items: center;
      padding: 20px 25px;
      cursor: pointer;
      background-color: #fff;
      border-bottom: 1px solid transparent;
      transition: var(--page-88online4-transition);
      user-select: none;
    }

    .page-88online4__faq-question:hover {
      background-color: #f0f0f0;
    }

    .page-88online4__faq-question h3 {
      font-size: 1.25em;
      color: var(--page-88online4-text-color);
      margin: 0;
      pointer-events: none; /* Prevent h3 from blocking click event */
      flex-grow: 1;
      word-wrap: break-word;
      overflow-wrap: break-word;
    }

    .page-88online4__faq-toggle {
      font-size: 1.8em;
      color: var(--page-88online4-primary-color);
      margin-left: 15px;
      transition: transform 0.3s ease;
      pointer-events: none; /* Prevent toggle from blocking click event */
      flex-shrink: 0;
    }

    .page-88online4__faq-item.active .page-88online4__faq-toggle {
      transform: rotate(45deg); /* Change '+' to 'x' visually */
    }

    .page-88online4__faq-answer {
      max-height: 0;
      overflow: hidden;
      padding: 0 25px;
      opacity: 0;
      transition: max-height 0.4s cubic-bezier(0.4, 0, 0.2, 1), padding 0.4s ease, opacity 0.4s ease;
      color: #555;
      font-size: 1em;
      word-wrap: break-word;
      overflow-wrap: break-word;
    }

    .page-88online4__faq-item.active .page-88online4__faq-answer {
      max-height: 2000px !important; /* Sufficiently large */
      padding: 20px 25px !important;
      opacity: 1;
    }

    /* CTA cuối trang */
    .page-88online4__cta-section {
      text-align: center;
      padding: 80px 20px;
      background: linear-gradient(135deg, var(--page-88online4-primary-color), var(--page-88online4-secondary-color));
      color: var(--page-88online4-light-text-color);
    }

    .page-88online4__cta-section h2 {
      font-size: 2.8em;
      margin-bottom: 20px;
      color: #fff;
      word-wrap: break-word;
    }

    .page-88online4__cta-section p {
      font-size: 1.2em;
      max-width: 800px;
      margin: 0 auto 40px auto;
      color: #eee;
      word-wrap: break-word;
    }

    .page-88online4__cta-button {
      display: inline-block;
      padding: 18px 40px;
      background-color: #fff;
      color: var(--page-88online4-primary-color);
      font-size: 1.4em;
      font-weight: bold;
      border-radius: 50px;
      text-decoration: none;
      box-shadow: var(--page-88online4-shadow);
      transition: var(--page-88online4-transition);
    }

    .page-88online4__cta-button:hover {
      background-color: #f0f0f0;
      transform: translateY(-5px);
      box-shadow: 0 8px 20px rgba(0, 0, 0, 0.2);
    }

    /* Responsive */
    @media (max-width: 768px) {
      .page-88online4__container {
        padding: 15px;
      }

      .page-88online4__hero-section {
        min-height: 350px;
        padding-top: 10px; /* Adjust for fixed header on mobile */
      }

      .page-88online4__title {
        font-size: 2.2em;
      }

      .page-88online4__subtitle {
        font-size: 1em;
      }

      .page-88online4__section-title {
        font-size: 2em;
      }

      .page-88online4__floating-button-container {
        bottom: 15px;
        width: 95%;
      }

      .page-88online4__promo-button {
        font-size: 1.1em;
        padding: 12px 20px;
      }

      .page-88online4__features-grid,
      .page-88online4__game-gallery,
      .page-88online4__promo-grid {
        grid-template-columns: 1fr;
        gap: 20px;
      }

      .page-88online4__feature-item,
      .page-88online4__step-item,
      .page-88online4__game-card,
      .page-88online4__promo-card,
      .page-88online4__faq-item {
        width: 100% !important;
        max-width: 100% !important;
        box-sizing: border-box !important;
        margin-left: 0 !important;
        margin-right: 0 !important;
      }

      .page-88online4__steps-list,
      .page-88online4__faq-list {
        padding: 0 !important;
        width: 100% !important;
        max-width: 100% !important;
        box-sizing: border-box !important;
        margin-left: 0 !important;
        margin-right: 0 !important;
      }
      
      .page-88online4__step-item {
        flex-direction: column;
        align-items: center;
        text-align: center;
        padding: 20px;
      }

      .page-88online4__step-item::before {
        margin-right: 0;
        margin-bottom: 15px;
      }

      .page-88online4__step-description h3 {
        font-size: 1.2em;
      }

      .page-88online4__step-description p {
        font-size: 0.95em;
      }

      .page-88online4__game-image,
      .page-88online4__promo-image {
        height: 150px;
      }

      .page-88online4__faq-question {
        padding: 15px 20px;
      }

      .page-88online4__faq-question h3 {
        font-size: 1.1em;
      }

      .page-88online4__faq-answer {
        padding: 15px 20px;
      }

      .page-88online4__cta-section h2 {
        font-size: 2em;
      }

      .page-88online4__cta-section p {
        font-size: 1em;
      }

      .page-88online4__cta-button {
        padding: 15px 30px;
        font-size: 1.2em;
      }
    }

    @media (max-width: 480px) {
      .page-88online4__title {
        font-size: 1.8em;
      }
      .page-88online4__hero-content {
        padding: 15px;
      }
      .page-88online4__section-title {
        font-size: 1.8em;
      }
      .page-88online4__feature-item h3 {
        font-size: 1.3em;
      }
      .page-88online4__faq-question h3 {
        font-size: 1em;
      }
      .page-88online4__cta-section h2 {
        font-size: 1.8em;
      }
    }

    /* Ensure images are responsive */
    .page-88online4 img {
      max-width: 100%;
      height: auto;
      display: block; /* Remove extra space below images */
    }

    /* Force responsive for all images and containers on mobile */
    @media (max-width: 768px) {
      .page-88online4 img {
        max-width: 100% !important;
        height: auto !important;
        box-sizing: border-box !important;
      }
      .page-88online4__hero-section .page-88online4__banner-image {
        width: 100% !important;
        max-width: 100% !important;
        box-sizing: border-box !important;
      }
      .page-88online4__feature-icon,
      .page-88online4__game-image,
      .page-88online4__promo-image {
        width: 100% !important;
        max-width: 100% !important;
        height: auto !important; /* Maintain aspect ratio */
        box-sizing: border-box !important;
      }
      .page-88online4 p, .page-88online4 h1, .page-88online4 h2, .page-88online4 h3, .page-88online4 h4, .page-88online4 h5, .page-88online4 h6 {
        word-wrap: break-word !important;
        overflow-wrap: break-word !important;
        word-break: break-word !important;
      }
    }