:root {
      --page-tf8899-primary-color: #e44d26; /* Cam đỏ */
      --page-tf8899-secondary-color: #333; /* Xám đậm */
      --page-tf8899-accent-color: #ffb300; /* Vàng cam */
      --page-tf8899-light-bg: #f5f5f5; /* Nền sáng */
      --page-tf8899-dark-bg: #222; /* Nền tối */
      --page-tf8899-text-color: #333; /* Màu chữ chính */
      --page-tf8899-light-text: #fff; /* Màu chữ sáng */
      --page-tf8899-border-color: #ddd; /* Màu viền */
      --page-tf8899-card-bg: #fff; /* Nền thẻ */
    }

    .page-tf8899 {
      font-family: 'Arial', sans-serif;
      line-height: 1.6;
      color: var(--page-tf8899-text-color);
      background-color: var(--page-tf8899-light-bg);
      overflow-x: hidden;
    }

    .page-tf8899__hero-section {
      position: relative;
      width: 100%;
      min-height: 500px;
      display: flex;
      align-items: center;
      justify-content: center;
      text-align: center;
      color: var(--page-tf8899-light-text);
      overflow: hidden;
      padding-top: 10px; /* Essential for fixed header */
      box-sizing: border-box;
    }

    .page-tf8899__hero-background {
      position: absolute;
      top: 0;
      left: 0;
      width: 100%;
      height: 100%;
      object-fit: cover;
      z-index: -1;
      filter: brightness(0.6);
    }

    .page-tf8899__hero-content {
      position: relative;
      z-index: 1;
      max-width: 900px;
      padding: 20px;
      background: rgba(0, 0, 0, 0.4);
      border-radius: 10px;
    }

    .page-tf8899__hero-title {
      font-size: 3em;
      margin-bottom: 15px;
      color: var(--page-tf8899-accent-color);
      text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.7);
    }

    .page-tf8899__hero-description {
      font-size: 1.2em;
      margin-bottom: 30px;
      line-height: 1.8;
    }

    .page-tf8899__promo-button {
      display: inline-block;
      background-color: var(--page-tf8899-primary-color);
      color: var(--page-tf8899-light-text);
      padding: 15px 30px;
      border-radius: 50px;
      text-decoration: none;
      font-weight: bold;
      font-size: 1.1em;
      transition: background-color 0.3s ease, transform 0.3s ease;
      border: none;
      cursor: pointer;
    }

    .page-tf8899__promo-button:hover {
      background-color: #c7411f;
      transform: translateY(-3px);
    }

    .page-tf8899__section {
      padding: 60px 20px;
      max-width: 1200px;
      margin: 0 auto;
      text-align: center;
    }

    .page-tf8899__section--dark {
      background-color: var(--page-tf8899-dark-bg);
      color: var(--page-tf8899-light-text);
    }

    .page-tf8899__section-title {
      font-size: 2.5em;
      margin-bottom: 40px;
      color: var(--page-tf8899-primary-color);
      position: relative;
      padding-bottom: 15px;
    }

    .page-tf8899__section-title::after {
      content: '';
      position: absolute;
      left: 50%;
      bottom: 0;
      transform: translateX(-50%);
      width: 80px;
      height: 4px;
      background-color: var(--page-tf8899-accent-color);
      border-radius: 2px;
    }

    .page-tf8899__section--dark .page-tf8899__section-title {
      color: var(--page-tf8899-accent-color);
    }

    .page-tf8899__text-content {
      font-size: 1.1em;
      margin-bottom: 30px;
      max-width: 800px;
      margin-left: auto;
      margin-right: auto;
    }

    .page-tf8899__game-grid {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
      gap: 30px;
      margin-top: 40px;
    }

    .page-tf8899__game-item {
      background-color: var(--page-tf8899-card-bg);
      border-radius: 10px;
      box-shadow: 0 4px 15px rgba(0, 0, 0, 0.1);
      overflow: hidden;
      text-align: center;
      transition: transform 0.3s ease, box-shadow 0.3s ease;
      display: flex;
      flex-direction: column;
      justify-content: space-between;
    }

    .page-tf8899__game-item:hover {
      transform: translateY(-10px);
      box-shadow: 0 8px 25px rgba(0, 0, 0, 0.2);
    }

    .page-tf8899__game-image-wrapper {
      width: 100%;
      height: 200px; /* Fixed height for image consistency */
      overflow: hidden;
      display: flex;
      justify-content: center;
      align-items: center;
      background-color: #eee;
    }

    .page-tf8899__game-image {
      width: 100%;
      height: 100%;
      object-fit: cover;
      transition: transform 0.3s ease;
    }

    .page-tf8899__game-item:hover .page-tf8899__game-image {
      transform: scale(1.05);
    }

    .page-tf8899__game-content {
      padding: 20px;
      flex-grow: 1;
      display: flex;
      flex-direction: column;
      justify-content: space-between;
    }

    .page-tf8899__game-title {
      font-size: 1.5em;
      color: var(--page-tf8899-secondary-color);
      margin-bottom: 10px;
      min-height: 40px; /* Ensure consistent height for titles */
    }

    .page-tf8899__game-description {
      font-size: 0.95em;
      color: #666;
      margin-bottom: 20px;
    }

    .page-tf8899__game-button {
      background-color: var(--page-tf8899-accent-color);
      color: var(--page-tf8899-light-text);
      padding: 10px 20px;
      border-radius: 25px;
      text-decoration: none;
      font-weight: bold;
      font-size: 0.9em;
      transition: background-color 0.3s ease;
      border: none;
      cursor: pointer;
    }

    .page-tf8899__game-button:hover {
      background-color: #e6a200;
    }

    .page-tf8899__promo-grid {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
      gap: 30px;
      margin-top: 40px;
    }

    .page-tf8899__promo-card {
      background-color: var(--page-tf8899-card-bg);
      border-radius: 10px;
      box-shadow: 0 4px 15px rgba(0, 0, 0, 0.1);
      overflow: hidden;
      text-align: left;
      transition: transform 0.3s ease, box-shadow 0.3s ease;
    }

    .page-tf8899__promo-card:hover {
      transform: translateY(-8px);
      box-shadow: 0 6px 20px rgba(0, 0, 0, 0.15);
    }

    .page-tf8899__promo-card-image {
      width: 100%;
      height: 220px;
      object-fit: cover;
      display: block;
    }

    .page-tf8899__promo-card-content {
      padding: 25px;
    }

    .page-tf8899__promo-card-title {
      font-size: 1.6em;
      color: var(--page-tf8899-primary-color);
      margin-bottom: 10px;
    }

    .page-tf8899__promo-card-description {
      font-size: 1em;
      color: #555;
      margin-bottom: 20px;
    }

    .page-tf8899__guide-steps {
      display: flex;
      flex-wrap: wrap;
      justify-content: center;
      gap: 40px;
      margin-top: 40px;
    }

    .page-tf8899__guide-step {
      background-color: var(--page-tf8899-card-bg);
      border-radius: 10px;
      box-shadow: 0 4px 15px rgba(0, 0, 0, 0.1);
      padding: 30px;
      max-width: 300px;
      text-align: center;
      transition: transform 0.3s ease;
    }

    .page-tf8899__guide-step:hover {
      transform: translateY(-5px);
    }

    .page-tf8899__guide-step-icon-wrapper {
        width: 100px;
        height: 100px;
        margin: 0 auto 20px;
        border-radius: 50%;
        background-color: var(--page-tf8899-primary-color);
        display: flex;
        justify-content: center;
        align-items: center;
        box-shadow: 0 0 0 5px rgba(228, 77, 38, 0.3);
    }

    .page-tf8899__guide-step-icon {
        width: 80%;
        height: 80%;
        object-fit: contain;
        max-width: 200px; /* Ensure minimum size */
        max-height: 200px; /* Ensure minimum size */
    }

    .page-tf8899__guide-step-title {
      font-size: 1.4em;
      color: var(--page-tf8899-secondary-color);
      margin-bottom: 10px;
    }

    .page-tf8899__guide-step-description {
      font-size: 1em;
      color: #666;
    }

    .page-tf8899__faq-container {
      max-width: 900px;
      margin: 40px auto 0;
      text-align: left;
    }

    .page-tf8899__faq-item {
      background-color: var(--page-tf8899-card-bg);
      border-radius: 8px;
      margin-bottom: 15px;
      box-shadow: 0 2px 10px rgba(0, 0, 0, 0.08);
      overflow: hidden;
    }

    .page-tf8899__faq-question {
      display: flex;
      justify-content: space-between;
      align-items: center;
      padding: 20px 25px;
      background-color: #fff;
      cursor: pointer;
      user-select: none;
      border-bottom: 1px solid var(--page-tf8899-border-color);
      transition: background-color 0.3s ease;
    }

    .page-tf8899__faq-question:hover {
      background-color: #f9f9f9;
    }

    .page-tf8899__faq-question h3 {
      margin: 0;
      font-size: 1.2em;
      color: var(--page-tf8899-secondary-color);
      flex-grow: 1;
      pointer-events: none; /* Prevent h3 from blocking click event */
    }

    .page-tf8899__faq-toggle {
      font-size: 1.8em;
      font-weight: bold;
      color: var(--page-tf8899-primary-color);
      margin-left: 15px;
      transition: transform 0.3s ease;
      pointer-events: none; /* Prevent toggle from blocking click event */
    }

    .page-tf8899__faq-item.active .page-tf8899__faq-toggle {
      transform: rotate(45deg); /* Change + to X or similar */
    }

    .page-tf8899__faq-answer {
      max-height: 0;
      overflow: hidden;
      padding: 0 25px;
      transition: max-height 0.4s cubic-bezier(0.4, 0, 0.2, 1), padding 0.4s ease, opacity 0.4s ease;
      opacity: 0;
      color: #555;
      background-color: #fcfcfc;
    }

    .page-tf8899__faq-item.active .page-tf8899__faq-answer {
      max-height: 2000px !important; /* Sufficiently large to contain content */
      padding: 20px 25px !important;
      opacity: 1;
    }
    
    .page-tf8899__faq-answer p {
        margin-top: 0;
        margin-bottom: 10px;
    }

    .page-tf8899__why-choose-list {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
      gap: 30px;
      margin-top: 40px;
      list-style: none;
      padding: 0;
    }

    .page-tf8899__why-choose-item {
      background-color: var(--page-tf8899-card-bg);
      border-radius: 10px;
      box-shadow: 0 4px 15px rgba(0, 0, 0, 0.1);
      padding: 30px;
      text-align: center;
      transition: transform 0.3s ease;
    }

    .page-tf8899__why-choose-item:hover {
      transform: translateY(-5px);
    }

    .page-tf8899__why-choose-icon-wrapper {
        width: 80px;
        height: 80px;
        margin: 0 auto 20px;
        border-radius: 50%;
        background-color: var(--page-tf8899-accent-color);
        display: flex;
        justify-content: center;
        align-items: center;
        box-shadow: 0 0 0 5px rgba(255, 179, 0, 0.3);
    }

    .page-tf8899__why-choose-icon {
        width: 60%;
        height: 60%;
        object-fit: contain;
        max-width: 200px; /* Ensure minimum size */
        max-height: 200px; /* Ensure minimum size */
    }

    .page-tf8899__why-choose-title {
      font-size: 1.3em;
      color: var(--page-tf8899-secondary-color);
      margin-bottom: 10px;
    }

    .page-tf8899__why-choose-text {
      font-size: 0.95em;
      color: #666;
    }

    .page-tf8899__floating-promo {
      position: fixed;
      bottom: 20px;
      right: 20px;
      z-index: 1000;
      background-color: var(--page-tf8899-primary-color);
      color: var(--page-tf8899-light-text);
      padding: 12px 25px;
      border-radius: 50px;
      box-shadow: 0 4px 15px rgba(0, 0, 0, 0.2);
      text-decoration: none;
      font-weight: bold;
      font-size: 1.1em;
      animation: page-tf8899__pulse 2s infinite;
      display: flex;
      align-items: center;
      justify-content: center;
      transition: background-color 0.3s ease;
    }

    .page-tf8899__floating-promo:hover {
      background-color: #c7411f;
    }

    @keyframes page-tf8899__pulse {
      0% { transform: scale(1); }
      50% { transform: scale(1.05); }
      100% { transform: scale(1); }
    }

    /* Responsive adjustments */
    @media (max-width: 768px) {
      .page-tf8899__hero-section {
        min-height: 400px;
        padding-top: 10px; /* Essential for fixed header */
      }

      .page-tf8899__hero-title {
        font-size: 2.2em;
      }

      .page-tf8899__hero-description {
        font-size: 1em;
      }

      .page-tf8899__promo-button {
        padding: 12px 25px;
        font-size: 1em;
      }

      .page-tf8899__section {
        padding: 40px 15px;
      }

      .page-tf8899__section-title {
        font-size: 2em;
        margin-bottom: 30px;
      }

      .page-tf8899__text-content {
        font-size: 0.95em;
      }

      .page-tf8899__game-grid,
      .page-tf8899__promo-grid,
      .page-tf8899__why-choose-list {
        grid-template-columns: 1fr;
        gap: 20px;
      }

      .page-tf8899__game-item {
        margin: 0 auto;
        max-width: 350px;
      }

      .page-tf8899__promo-card {
        margin: 0 auto;
        max-width: 400px;
      }

      .page-tf8899__guide-steps {
        flex-direction: column;
        align-items: center;
        gap: 30px;
      }

      .page-tf8899__guide-step {
        max-width: 90%;
      }

      .page-tf8899__faq-container {
        margin-top: 30px;
      }

      .page-tf8899__faq-question {
        padding: 15px 20px;
      }

      .page-tf8899__faq-question h3 {
        font-size: 1.1em;
      }

      .page-tf8899__faq-toggle {
        font-size: 1.5em;
      }

      .page-tf8899__faq-answer {
        padding: 0 20px;
      }
      .page-tf8899__faq-item.active .page-tf8899__faq-answer {
        padding: 15px 20px !important;
      }

      .page-tf8899__floating-promo {
        bottom: 15px;
        right: 15px;
        padding: 10px 20px;
        font-size: 0.95em;
      }
    }

    /* Ensure all images are responsive */
    .page-tf8899 img {
      max-width: 100%;
      height: auto;
      display: block; /* Remove extra space below images */
    }

    .page-tf8899__game-image-wrapper,
    .page-tf8899__promo-card-image,
    .page-tf8899__guide-step-icon-wrapper,
    .page-tf8899__why-choose-icon-wrapper {
        width: 100%;
        max-width: 100%;
        overflow: hidden;
        box-sizing: border-box;
    }
    
    @media (max-width: 768px) {
        .page-tf8899 img {
            max-width: 100% !important;
            height: auto !important;
        }
        .page-tf8899__game-image-wrapper,
        .page-tf8899__promo-card-image,
        .page-tf8899__guide-step-icon-wrapper,
        .page-tf8899__why-choose-icon-wrapper {
            width: 100% !important;
            max-width: 100% !important;
            overflow: hidden !important;
            box-sizing: border-box !important;
        }
    }