/* Tổng quan */
    :root {
      --page-tf88-primary-color: #007bff; /* Xanh dương */
      --page-tf88-secondary-color: #ffc107; /* Vàng */
      --page-tf88-dark-bg: #212529; /* Đen xám */
      --page-tf88-light-bg: #f8f9fa; /* Trắng xám */
      --page-tf88-text-color: #343a40; /* Xám đậm */
      --page-tf88-white: #ffffff;
      --page-tf88-border-color: #dee2e6;
      --page-tf88-green: #28a745; /* Xanh lá */
      --page-tf88-red: #dc3545; /* Đỏ */
    }

    .page-tf88 {
      font-family: 'Arial', sans-serif;
      line-height: 1.6;
      color: var(--page-tf88-text-color);
      background-color: var(--page-tf88-light-bg);
    }

    .page-tf88__container {
      max-width: 1200px;
      margin: 0 auto;
      padding: 20px;
    }

    @media (max-width: 768px) {
      .page-tf88__container {
        padding: 10px;
      }
    }

    /* Hero Section */
    .page-tf88__hero-section {
      background: linear-gradient(rgba(0,0,0,0.6), rgba(0,0,0,0.6)), url('[GALLERY:hero:1920x1080:tf88,betting,sports]') no-repeat center center/cover;
      color: var(--page-tf88-white);
      padding: 10px 20px 80px 20px; /* Small padding-top as body handles header offset */
      text-align: center;
      display: flex;
      flex-direction: column;
      justify-content: center;
      align-items: center;
      min-height: 500px;
    }

    .page-tf88__hero-title {
      font-size: 3.5em;
      margin-bottom: 20px;
      color: var(--page-tf88-secondary-color);
      text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.7);
      line-height: 1.2;
    }

    .page-tf88__hero-description {
      font-size: 1.3em;
      margin-bottom: 30px;
      max-width: 800px;
      text-shadow: 1px 1px 2px rgba(0, 0, 0, 0.5);
    }

    .page-tf88__hero-button {
      background-color: var(--page-tf88-primary-color);
      color: var(--page-tf88-white);
      padding: 15px 30px;
      font-size: 1.2em;
      border: none;
      border-radius: 5px;
      cursor: pointer;
      text-decoration: none;
      transition: background-color 0.3s ease;
      font-weight: bold;
      box-shadow: 0 4px 6px rgba(0, 0, 0, 0.3);
    }

    .page-tf88__hero-button:hover {
      background-color: #0056b3; /* Màu xanh đậm hơn */
    }

    @media (max-width: 768px) {
      .page-tf88__hero-section {
        padding: 10px 10px 60px 10px;
        min-height: 400px;
      }
      .page-tf88__hero-title {
        font-size: 2.5em;
      }
      .page-tf88__hero-description {
        font-size: 1em;
      }
      .page-tf88__hero-button {
        padding: 12px 25px;
        font-size: 1em;
      }
    }

    /* General Section Styling */
    .page-tf88__section {
      padding: 60px 0;
      text-align: center;
    }

    .page-tf88__section--dark {
      background-color: var(--page-tf88-dark-bg);
      color: var(--page-tf88-white);
    }

    .page-tf88__section-title {
      font-size: 2.5em;
      margin-bottom: 40px;
      color: var(--page-tf88-primary-color);
    }
    .page-tf88__section--dark .page-tf88__section-title {
        color: var(--page-tf88-secondary-color);
    }

    .page-tf88__section-text {
      font-size: 1.1em;
      max-width: 900px;
      margin: 0 auto 30px auto;
      text-align: left;
    }

    @media (max-width: 768px) {
      .page-tf88__section {
        padding: 40px 0;
      }
      .page-tf88__section-title {
        font-size: 2em;
        margin-bottom: 30px;
      }
      .page-tf88__section-text {
        font-size: 1em;
        padding: 0 10px;
      }
    }

    /* Advantages Section */
    .page-tf88__advantages-grid {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
      gap: 30px;
      margin-top: 40px;
      text-align: left;
    }

    .page-tf88__advantage-item {
      background-color: var(--page-tf88-white);
      padding: 30px;
      border-radius: 8px;
      box-shadow: 0 4px 15px rgba(0, 0, 0, 0.1);
      transition: transform 0.3s ease;
      box-sizing: border-box; /* Required for list items */
    }

    .page-tf88__advantage-item:hover {
      transform: translateY(-5px);
    }

    .page-tf88__advantage-title {
      font-size: 1.5em;
      color: var(--page-tf88-primary-color);
      margin-bottom: 15px;
    }

    .page-tf88__advantage-description {
      font-size: 1em;
      color: var(--page-tf88-text-color);
    }

    @media (max-width: 768px) {
      .page-tf88__advantages-grid {
        grid-template-columns: 1fr !important; /* Force single column on mobile */
        gap: 20px !important;
        padding: 0 10px !important;
        width: 100% !important;
        max-width: 100% !important;
        box-sizing: border-box !important;
        margin-left: 0 !important;
        margin-right: 0 !important;
      }
      .page-tf88__advantage-item {
        width: 100% !important;
        max-width: 100% !important;
        padding: 20px !important;
        box-sizing: border-box !important;
        margin-left: 0 !important;
        margin-right: 0 !important;
      }
      .page-tf88__advantage-title {
        font-size: 1.3em;
      }
    }

    /* Game Categories Section */
    .page-tf88__game-grid {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
      gap: 30px;
      margin-top: 40px;
    }

    .page-tf88__game-card {
      background-color: var(--page-tf88-white);
      border-radius: 8px;
      box-shadow: 0 4px 15px rgba(0, 0, 0, 0.1);
      overflow: hidden;
      text-align: center;
      transition: transform 0.3s ease;
      box-sizing: border-box; /* Required for list items */
    }

    .page-tf88__game-card:hover {
      transform: translateY(-5px);
    }

    .page-tf88__game-image {
      width: 100%;
      height: 200px;
      object-fit: cover;
      display: block;
      max-width: 100%; /* Mobile responsive */
      height: auto; /* Mobile responsive */
    }

    .page-tf88__game-content {
      padding: 20px;
    }

    .page-tf88__game-title {
      font-size: 1.4em;
      color: var(--page-tf88-primary-color);
      margin-bottom: 10px;
    }

    .page-tf88__game-description {
      font-size: 0.95em;
      color: var(--page-tf88-text-color);
      word-wrap: break-word; /* Mobile responsive text */
      overflow-wrap: break-word; /* Mobile responsive text */
      word-break: break-word; /* Mobile responsive text */
    }

    @media (max-width: 768px) {
      .page-tf88__game-grid {
        grid-template-columns: 1fr !important; /* Force single column on mobile */
        gap: 20px !important;
        padding: 0 10px !important;
        width: 100% !important;
        max-width: 100% !important;
        box-sizing: border-box !important;
        margin-left: 0 !important;
        margin-right: 0 !important;
      }
      .page-tf88__game-card {
        width: 100% !important;
        max-width: 100% !important;
        box-sizing: border-box !important;
        margin-left: 0 !important;
        margin-right: 0 !important;
      }
      .page-tf88__game-image {
        height: 180px;
      }
      .page-tf88__game-title {
        font-size: 1.2em;
      }
      .page-tf88__game-content {
        padding: 15px;
      }
    }

    /* How-to Section (Instructions) */
    .page-tf88__instructions-list {
      display: flex;
      flex-wrap: wrap;
      justify-content: center;
      gap: 30px;
      margin-top: 40px;
      list-style: none;
      padding: 0;
    }

    .page-tf88__instruction-item {
      background-color: var(--page-tf88-white);
      padding: 30px;
      border-radius: 8px;
      box-shadow: 0 4px 15px rgba(0, 0, 0, 0.1);
      flex: 1 1 calc(33% - 40px); /* Three items per row */
      min-width: 300px;
      text-align: left;
      box-sizing: border-box; /* Required for list items */
    }

    .page-tf88__instruction-step {
      font-size: 2em;
      color: var(--page-tf88-secondary-color);
      font-weight: bold;
      margin-bottom: 10px;
    }

    .page-tf88__instruction-title {
      font-size: 1.5em;
      color: var(--page-tf88-primary-color);
      margin-bottom: 15px;
    }

    .page-tf88__instruction-description {
      font-size: 1em;
      color: var(--page-tf88-text-color);
      word-wrap: break-word; /* Mobile responsive text */
      overflow-wrap: break-word; /* Mobile responsive text */
      word-break: break-word; /* Mobile responsive text */
    }

    @media (max-width: 768px) {
      .page-tf88__instructions-list {
        flex-direction: column !important; /* Stack items on mobile */
        gap: 20px !important;
        padding: 0 10px !important;
        width: 100% !important;
        max-width: 100% !important;
        box-sizing: border-box !important;
        margin-left: 0 !important;
        margin-right: 0 !important;
      }
      .page-tf88__instruction-item {
        flex: 1 1 100% !important;
        width: 100% !important;
        max-width: 100% !important;
        padding: 20px !important;
        box-sizing: border-box !important;
        margin-left: 0 !important;
        margin-right: 0 !important;
      }
      .page-tf88__instruction-step {
        font-size: 1.5em;
      }
      .page-tf88__instruction-title {
        font-size: 1.3em;
      }
    }

    /* Promotion Section */
    .page-tf88__promotion-content {
      display: flex;
      flex-direction: column;
      align-items: center;
      gap: 20px;
      max-width: 900px;
      margin: 0 auto;
    }

    .page-tf88__promotion-image {
      width: 100%;
      max-width: 600px;
      height: auto;
      border-radius: 8px;
      box-shadow: 0 4px 15px rgba(0, 0, 0, 0.2);
      max-width: 100%; /* Mobile responsive */
      height: auto; /* Mobile responsive */
    }

    .page-tf88__promotion-text {
      font-size: 1.1em;
      margin-bottom: 20px;
      text-align: center;
      color: var(--page-tf88-white);
    }

    .page-tf88__promotion-button {
      background-color: var(--page-tf88-secondary-color);
      color: var(--page-tf88-dark-bg);
      padding: 15px 30px;
      font-size: 1.2em;
      border: none;
      border-radius: 5px;
      cursor: pointer;
      text-decoration: none;
      transition: background-color 0.3s ease;
      font-weight: bold;
      box-shadow: 0 4px 6px rgba(0, 0, 0, 0.3);
    }

    .page-tf88__promotion-button:hover {
      background-color: #e0a800; /* Màu vàng đậm hơn */
    }

    @media (max-width: 768px) {
      .page-tf88__promotion-image {
        max-width: 100% !important;
        width: 100% !important;
        box-sizing: border-box !important;
        padding: 0 10px !important;
      }
      .page-tf88__promotion-text {
        font-size: 1em;
        padding: 0 10px;
      }
      .page-tf88__promotion-button {
        padding: 12px 25px;
        font-size: 1em;
      }
    }


    /* FAQ Section */
    .page-tf88__faq-section {
        background-color: var(--page-tf88-light-bg);
        padding: 60px 0;
    }

    .page-tf88__faq-container {
        max-width: 900px;
        margin: 0 auto;
        padding: 0 20px;
    }

    .page-tf88__faq-item {
        background-color: var(--page-tf88-white);
        margin-bottom: 15px;
        border-radius: 8px;
        box-shadow: 0 2px 10px rgba(0, 0, 0, 0.08);
        overflow: hidden;
        border: 1px solid var(--page-tf88-border-color);
        box-sizing: border-box; /* Ensure padding/border included in width */
    }

    .page-tf88__faq-question {
        display: flex;
        justify-content: space-between;
        align-items: center;
        padding: 20px 25px;
        cursor: pointer;
        background-color: var(--page-tf88-primary-color);
        color: var(--page-tf88-white);
        border-bottom: 1px solid var(--page-tf88-primary-color);
        transition: background-color 0.3s ease;
        user-select: none;
    }

    .page-tf88__faq-question:hover {
        background-color: #0056b3; /* Darker primary on hover */
    }

    .page-tf88__faq-question h3 {
        margin: 0;
        font-size: 1.2em;
        font-weight: bold;
        color: inherit; /* Inherit color from parent */
        pointer-events: none; /* Prevent h3 from blocking click event */
        word-wrap: break-word; /* Mobile responsive text */
        overflow-wrap: break-word; /* Mobile responsive text */
        word-break: break-word; /* Mobile responsive text */
        flex-grow: 1; /* Allow question text to take available space */
    }

    .page-tf88__faq-toggle {
        font-size: 1.5em;
        font-weight: bold;
        margin-left: 15px;
        transition: transform 0.3s ease;
        pointer-events: none; /* Prevent toggle icon from blocking click event */
    }

    .page-tf88__faq-answer {
        max-height: 0;
        overflow: hidden;
        padding: 0 25px;
        background-color: var(--page-tf88-white);
        color: var(--page-tf88-text-color);
        transition: max-height 0.4s cubic-bezier(0.4, 0, 0.2, 1), padding 0.4s ease, opacity 0.4s ease;
        opacity: 0;
        text-align: left;
        word-wrap: break-word; /* Mobile responsive text */
        overflow-wrap: break-word; /* Mobile responsive text */
        word-break: break-word; /* Mobile responsive text */
    }

    .page-tf88__faq-item.active .page-tf88__faq-answer {
        max-height: 2000px !important; /* Sufficiently large to contain content */
        padding: 20px 25px !important;
        opacity: 1;
    }

    .page-tf88__faq-item.active .page-tf88__faq-toggle {
        transform: rotate(45deg); /* Change '+' to 'x' or '-' */
    }

    @media (max-width: 768px) {
        .page-tf88__faq-section {
            padding: 40px 0;
        }
        .page-tf88__faq-container {
            padding: 0 10px !important;
            width: 100% !important;
            max-width: 100% !important;
            box-sizing: border-box !important;
            margin-left: 0 !important;
            margin-right: 0 !important;
        }
        .page-tf88__faq-item {
            width: 100% !important;
            max-width: 100% !important;
            box-sizing: border-box !important;
            margin-left: 0 !important;
            margin-right: 0 !important;
        }
        .page-tf88__faq-question {
            padding: 15px 20px;
        }
        .page-tf88__faq-question h3 {
            font-size: 1em;
        }
        .page-tf88__faq-toggle {
            font-size: 1.2em;
            margin-left: 10px;
        }
        .page-tf88__faq-answer {
            padding: 15px 20px !important;
            font-size: 0.95em;
        }
    }

    /* Final CTA */
    .page-tf88__cta-button {
      background-color: var(--page-tf88-green);
      color: var(--page-tf88-white);
      padding: 18px 35px;
      font-size: 1.3em;
      border: none;
      border-radius: 5px;
      cursor: pointer;
      text-decoration: none;
      transition: background-color 0.3s ease;
      font-weight: bold;
      box-shadow: 0 6px 10px rgba(0, 0, 0, 0.3);
      margin-top: 30px;
    }

    .page-tf88__cta-button:hover {
      background-color: #218838; /* Darker green */
    }

    @media (max-width: 768px) {
      .page-tf88__cta-button {
        padding: 15px 30px;
        font-size: 1.1em;
      }
    }