:root {
      --page-138vn-primary-color: #e44d26; /* Cam đỏ */
      --page-138vn-secondary-color: #333; /* Xám đậm */
      --page-138vn-accent-color: #007bff; /* Xanh dương */
      --page-138vn-text-color: #f0f0f0; /* Trắng nhạt */
      --page-138vn-bg-color: #1a1a1a; /* Nền tối */
      --page-138vn-light-bg-color: #2a2a2a; /* Nền sáng hơn một chút */
      --page-138vn-border-color: #444; /* Viền */
      --page-138vn-button-hover-color: #ff6a00; /* Cam sáng */
    }

    body {
      background-color: var(--page-138vn-bg-color);
      color: var(--page-138vn-text-color);
      font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
      line-height: 1.6;
      margin: 0;
      padding-top: var(--header-offset, 122px); /* Fallback for header offset */
    }

    .page-138vn {
      max-width: 1200px;
      margin: 0 auto;
      padding: 10px;
      box-sizing: border-box;
    }

    .page-138vn__hero-section {
      position: relative;
      width: 100%;
      height: 60vh; /* Responsive height */
      background-color: var(--page-138vn-light-bg-color);
      display: flex;
      flex-direction: column;
      justify-content: center;
      align-items: center;
      text-align: center;
      overflow: hidden;
      border-radius: 10px;
      margin-bottom: 20px;
      padding-top: 10px; /* Small padding top as body handles main offset */
      box-sizing: border-box;
    }

    .page-138vn__hero-background {
      position: absolute;
      top: 0;
      left: 0;
      width: 100%;
      height: 100%;
      object-fit: cover;
      z-index: 1;
      opacity: 0.6;
    }

    .page-138vn__hero-content {
      position: relative;
      z-index: 2;
      padding: 20px;
      background: rgba(0, 0, 0, 0.5);
      border-radius: 10px;
      max-width: 90%;
    }

    .page-138vn__main-title {
      font-size: 2.8em;
      color: var(--page-138vn-primary-color);
      margin-bottom: 10px;
      text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.7);
      word-wrap: break-word;
    }

    .page-138vn__hero-subtitle {
      font-size: 1.4em;
      color: var(--page-138vn-text-color);
      margin-bottom: 20px;
      word-wrap: break-word;
    }

    .page-138vn__promo-button {
      display: inline-block;
      background-color: var(--page-138vn-accent-color);
      color: #fff;
      padding: 12px 25px;
      border-radius: 5px;
      text-decoration: none;
      font-weight: bold;
      transition: background-color 0.3s ease;
      font-size: 1.1em;
      cursor: pointer;
      border: none;
    }

    .page-138vn__promo-button:hover {
      background-color: var(--page-138vn-button-hover-color);
    }

    .page-138vn__section-title {
      font-size: 2.2em;
      color: var(--page-138vn-primary-color);
      text-align: center;
      margin: 40px 0 25px;
      position: relative;
      padding-bottom: 10px;
    }

    .page-138vn__section-title::after {
      content: '';
      position: absolute;
      left: 50%;
      bottom: 0;
      transform: translateX(-50%);
      width: 80px;
      height: 4px;
      background-color: var(--page-138vn-primary-color);
      border-radius: 2px;
    }

    .page-138vn__game-categories {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
      gap: 20px;
      margin-bottom: 40px;
    }

    .page-138vn__game-card {
      background-color: var(--page-138vn-light-bg-color);
      border-radius: 10px;
      overflow: hidden;
      box-shadow: 0 4px 15px rgba(0, 0, 0, 0.3);
      text-align: center;
      transition: transform 0.3s ease, box-shadow 0.3s ease;
      display: flex;
      flex-direction: column;
      height: 100%;
    }

    .page-138vn__game-card:hover {
      transform: translateY(-5px);
      box-shadow: 0 8px 20px rgba(0, 0, 0, 0.5);
    }

    .page-138vn__game-image-container {
      width: 100%;
      height: 200px;
      overflow: hidden;
      box-sizing: border-box;
    }

    .page-138vn__game-image {
      width: 100%;
      height: 100%;
      object-fit: cover;
      display: block;
    }

    .page-138vn__game-info {
      padding: 15px;
      flex-grow: 1;
      display: flex;
      flex-direction: column;
      justify-content: space-between;
    }

    .page-138vn__game-title {
      font-size: 1.5em;
      color: var(--page-138vn-primary-color);
      margin-top: 0;
      margin-bottom: 10px;
      word-wrap: break-word;
    }

    .page-138vn__game-description {
      font-size: 0.95em;
      color: var(--page-138vn-text-color);
      margin-bottom: 15px;
      flex-grow: 1;
      word-wrap: break-word;
    }

    .page-138vn__view-button {
      background-color: var(--page-138vn-primary-color);
      color: #fff;
      padding: 10px 20px;
      border-radius: 5px;
      text-decoration: none;
      font-weight: bold;
      transition: background-color 0.3s ease;
      cursor: pointer;
      border: none;
      width: fit-content;
      margin: 0 auto;
    }

    .page-138vn__view-button:hover {
      background-color: var(--page-138vn-button-hover-color);
    }

    .page-138vn__promotions-grid {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
      gap: 25px;
      margin-bottom: 40px;
    }

    .page-138vn__promotion-card {
      background-color: var(--page-138vn-light-bg-color);
      border-radius: 10px;
      overflow: hidden;
      box-shadow: 0 4px 15px rgba(0, 0, 0, 0.3);
      display: flex;
      flex-direction: column;
      align-items: center;
      padding: 20px;
      text-align: center;
    }

    .page-138vn__promotion-image-container {
      width: 100%;
      max-width: 400px;
      height: 250px;
      overflow: hidden;
      border-radius: 8px;
      margin-bottom: 15px;
      box-sizing: border-box;
    }

    .page-138vn__promotion-image {
      width: 100%;
      height: 100%;
      object-fit: cover;
      display: block;
    }

    .page-138vn__promotion-title {
      font-size: 1.6em;
      color: var(--page-138vn-accent-color);
      margin-bottom: 10px;
      word-wrap: break-word;
    }

    .page-138vn__promotion-description {
      font-size: 0.95em;
      color: var(--page-138vn-text-color);
      margin-bottom: 15px;
      word-wrap: break-word;
    }

    .page-138vn__news-section {
      background-color: var(--page-138vn-light-bg-color);
      padding: 30px;
      border-radius: 10px;
      margin-bottom: 40px;
      text-align: center;
    }

    .page-138vn__news-text {
      font-size: 1.1em;
      color: var(--page-138vn-text-color);
      margin-bottom: 20px;
      word-wrap: break-word;
    }

    .page-138vn__info-section {
      background-color: var(--page-138vn-light-bg-color);
      padding: 30px;
      border-radius: 10px;
      margin-bottom: 40px;
      text-align: center;
    }

    .page-138vn__info-content {
      font-size: 1.1em;
      color: var(--page-138vn-text-color);
      margin-bottom: 20px;
      word-wrap: break-word;
    }

    .page-138vn__payment-providers {
      display: flex;
      flex-wrap: wrap;
      justify-content: center;
      gap: 20px;
      margin-top: 30px;
    }

    .page-138vn__payment-logo-container {
      width: 120px;
      height: 80px;
      display: flex;
      justify-content: center;
      align-items: center;
      background-color: #fff;
      border-radius: 8px;
      box-shadow: 0 2px 8px rgba(0, 0, 0, 0.2);
      padding: 10px;
      box-sizing: border-box;
    }

    .page-138vn__payment-logo {
      max-width: 100%;
      max-height: 100%;
      object-fit: contain;
    }

    .page-138vn__faq-section {
      margin-bottom: 40px;
    }

    .page-138vn__faq-item {
      background-color: var(--page-138vn-light-bg-color);
      border: 1px solid var(--page-138vn-border-color);
      border-radius: 8px;
      margin-bottom: 15px;
      overflow: hidden;
    }

    .page-138vn__faq-question {
      display: flex;
      justify-content: space-between;
      align-items: center;
      padding: 15px 20px;
      cursor: pointer;
      background-color: var(--page-138vn-secondary-color);
      color: var(--page-138vn-text-color);
      font-size: 1.2em;
      font-weight: bold;
      transition: background-color 0.3s ease;
      user-select: none;
    }

    .page-138vn__faq-question:hover {
      background-color: #444;
    }

    .page-138vn__faq-question h3 {
      margin: 0;
      font-size: 1em; /* Adjust to fit parent */
      color: var(--page-138vn-text-color);
      pointer-events: none; /* Crucial for click event on parent */
      word-wrap: break-word;
      flex-grow: 1;
    }

    .page-138vn__faq-toggle {
      font-size: 1.5em;
      margin-left: 10px;
      transition: transform 0.3s ease;
      pointer-events: none; /* Crucial for click event on parent */
    }

    .page-138vn__faq-item.active .page-138vn__faq-toggle {
      transform: rotate(45deg);
    }

    .page-138vn__faq-answer {
      max-height: 0;
      overflow: hidden;
      padding: 0 15px; /* Initial padding */
      opacity: 0;
      transition: max-height 0.4s cubic-bezier(0.4, 0, 0.2, 1), padding 0.4s ease, opacity 0.4s ease;
      color: var(--page-138vn-text-color);
    }

    .page-138vn__faq-item.active .page-138vn__faq-answer {
      max-height: 2000px !important; /* Sufficiently large */
      padding: 20px 15px !important;
      opacity: 1;
    }

    .page-138vn__floating-buttons {
      position: fixed;
      bottom: 20px;
      right: 20px;
      z-index: 1000;
      display: flex;
      flex-direction: column;
      gap: 10px;
    }

    .page-138vn__floating-button {
      background-color: var(--page-138vn-primary-color);
      color: #fff;
      padding: 12px 20px;
      border-radius: 50px;
      text-decoration: none;
      font-weight: bold;
      font-size: 1.1em;
      box-shadow: 0 4px 10px rgba(0, 0, 0, 0.4);
      transition: background-color 0.3s ease, transform 0.2s ease;
      text-align: center;
      min-width: 120px;
    }

    .page-138vn__floating-button:hover {
      background-color: var(--page-138vn-button-hover-color);
      transform: translateY(-2px);
    }

    /* Responsive adjustments */
    @media (max-width: 768px) {
      .page-138vn {
        padding: 0; /* Remove horizontal padding on very small screens */
      }

      .page-138vn__hero-section {
        height: 50vh;
        border-radius: 0;
      }

      .page-138vn__main-title {
        font-size: 2em;
      }

      .page-138vn__hero-subtitle {
        font-size: 1.1em;
      }

      .page-138vn__promo-button {
        padding: 10px 20px;
        font-size: 1em;
      }

      .page-138vn__section-title {
        font-size: 1.8em;
        margin: 30px 0 20px;
      }

      .page-138vn__game-categories {
        grid-template-columns: 1fr; /* Single column on mobile */
        padding: 0 10px;
      }
      
      .page-138vn__game-card {
        margin-bottom: 15px;
      }

      .page-138vn__promotions-grid {
        grid-template-columns: 1fr; /* Single column on mobile */
        padding: 0 10px;
      }

      .page-138vn__promotion-card {
        padding: 15px;
      }

      .page-138vn__promotion-image-container {
        height: 200px;
      }

      .page-138vn__promotion-title {
        font-size: 1.4em;
      }

      .page-138vn__news-section,
      .page-138vn__info-section,
      .page-138vn__faq-section {
        padding: 20px 10px;
      }

      .page-138vn__faq-question {
        font-size: 1.1em;
        padding: 12px 15px;
      }

      .page-138vn__faq-answer {
        padding: 15px 15px;
      }

      .page-138vn__floating-buttons {
        bottom: 15px;
        right: 15px;
        flex-direction: row; /* Horizontal on mobile to save vertical space */
        gap: 8px;
      }

      .page-138vn__floating-button {
        padding: 10px 15px;
        font-size: 0.95em;
        min-width: unset;
      }

      /* Image responsiveness for all images */
      .page-138vn img {
        max-width: 100% !important;
        height: auto !important;
      }
      .page-138vn__game-image-container,
      .page-138vn__promotion-image-container {
        width: 100% !important;
        max-width: 100% !important;
        overflow: hidden !important;
        box-sizing: border-box !important;
      }

      /* List item responsiveness (if any were used, apply generally) */
      .page-138vn ul, .page-138vn ol {
        width: 100% !important;
        max-width: 100% !important;
        box-sizing: border-box !important;
        padding: 0 10px !important; /* Adjust as needed */
        margin-left: 0 !important;
        margin-right: 0 !important;
      }
      .page-138vn ul li, .page-138vn ol li {
        width: 100% !important;
        max-width: 100% !important;
        box-sizing: border-box !important;
        padding: 10px 0 !important; /* Adjust as needed */
        margin-left: 0 !important;
        margin-right: 0 !important;
        word-wrap: break-word !important;
        overflow-wrap: break-word !important;
        word-break: break-word !important;
      }
    }