:root {
      --page-primary-color: #0056b3; /* Darker blue for accents */
      --page-secondary-color: #f8f9fa; /* Light grey for sections */
      --page-text-color: #333;
      --page-heading-color: #2c3e50; /* Darker for headings */
      --page-link-color: #007bff;
      --page-link-hover-color: #0056b3;
      --page-border-color: #dee2e6;
      --page-background-light: #ffffff;
      --page-background-dark: #f0f2f5;
      --page-shadow-light: rgba(0, 0, 0, 0.05);
      --page-shadow-medium: rgba(0, 0, 0, 0.1);
      --page-success-color: #28a745;
      --page-error-color: #dc3545;
    }

    .page-resources-is-tk88-popular-in-vietnam {
      font-family: 'Arial', sans-serif;
      line-height: 1.7;
      color: var(--page-text-color);
      background-color: var(--page-background-light);
      padding: 20px 0;
    }

    .page-resources-is-tk88-popular-in-vietnam__container {
      max-width: 1200px;
      margin: 0 auto;
      padding: 0 15px;
      box-sizing: border-box;
    }

    .page-resources-is-tk88-popular-in-vietnam__hero-section {
      background: linear-gradient(135deg, var(--page-primary-color), #003366);
      color: #fff;
      padding: 10px 0 60px; /* Adjusted padding-top for fixed header */
      text-align: center;
      margin-bottom: 40px;
      position: relative;
      overflow: hidden;
      border-radius: 8px;
    }

    .page-resources-is-tk88-popular-in-vietnam__hero-section::before {
      content: '';
      position: absolute;
      top: 0;
      left: 0;
      width: 100%;
      height: 100%;
      background-image: url('[GALLERY:pattern:abstract, geometric, overlay]');
      background-size: cover;
      opacity: 0.1;
      z-index: 0;
    }

    .page-resources-is-tk88-popular-in-vietnam__hero-content {
      position: relative;
      z-index: 1;
    }

    .page-resources-is-tk88-popular-in-vietnam__hero-title {
      font-size: 2.8em;
      margin-bottom: 15px;
      font-weight: bold;
      color: #fff;
    }

    .page-resources-is-tk88-popular-in-vietnam__hero-description {
      font-size: 1.2em;
      max-width: 800px;
      margin: 0 auto 30px;
      line-height: 1.6;
    }

    .page-resources-is-tk88-popular-in-vietnam__cta-button {
      display: inline-block;
      background-color: #ffc107; /* Yellow for CTA */
      color: var(--page-heading-color);
      padding: 12px 30px;
      border-radius: 5px;
      text-decoration: none;
      font-weight: bold;
      font-size: 1.1em;
      transition: background-color 0.3s ease, transform 0.2s ease;
      box-shadow: 0 4px 10px var(--page-shadow-medium);
      border: none;
      cursor: pointer;
    }

    .page-resources-is-tk88-popular-in-vietnam__cta-button:hover {
      background-color: #e0a800;
      transform: translateY(-2px);
    }

    .page-resources-is-tk88-popular-in-vietnam__content-section {
      background-color: var(--page-background-light);
      padding: 40px 0;
      margin-bottom: 30px;
      border-radius: 8px;
      box-shadow: 0 2px 10px var(--page-shadow-light);
    }

    .page-resources-is-tk88-popular-in-vietnam__content-section--alt {
      background-color: var(--page-background-dark);
    }

    .page-resources-is-tk88-popular-in-vietnam__section-title {
      font-size: 2.2em;
      color: var(--page-heading-color);
      margin-bottom: 25px;
      text-align: center;
      position: relative;
      padding-bottom: 10px;
    }

    .page-resources-is-tk88-popular-in-vietnam__section-title::after {
      content: '';
      position: absolute;
      left: 50%;
      bottom: 0;
      transform: translateX(-50%);
      width: 60px;
      height: 4px;
      background-color: var(--page-primary-color);
      border-radius: 2px;
    }

    .page-resources-is-tk88-popular-in-vietnam__text-block {
      margin-bottom: 20px;
      font-size: 1.05em;
      color: var(--page-text-color);
    }

    .page-resources-is-tk88-popular-in-vietnam__text-block p {
      margin-bottom: 15px;
    }

    .page-resources-is-tk88-popular-in-vietnam__text-block strong {
      color: var(--page-primary-color);
    }

    .page-resources-is-tk88-popular-in-vietnam__image-wrapper {
      text-align: center;
      margin: 30px 0;
    }

    .page-resources-is-tk88-popular-in-vietnam__image {
      max-width: 100%;
      height: auto;
      border-radius: 8px;
      box-shadow: 0 4px 15px var(--page-shadow-medium);
    }

    .page-resources-is-tk88-popular-in-vietnam__list {
      list-style: none;
      padding: 0;
      margin: 20px 0;
    }

    .page-resources-is-tk88-popular-in-vietnam__list-item {
      background-color: var(--page-background-light);
      border: 1px solid var(--page-border-color);
      border-radius: 5px;
      margin-bottom: 10px;
      padding: 15px 20px;
      display: flex;
      align-items: flex-start;
      gap: 15px;
      box-shadow: 0 1px 5px var(--page-shadow-light);
    }

    .page-resources-is-tk88-popular-in-vietnam__list-item::before {
      content: '✓';
      color: var(--page-success-color);
      font-weight: bold;
      font-size: 1.2em;
      line-height: 1;
      flex-shrink: 0;
    }

    .page-resources-is-tk88-popular-in-vietnam__list-item strong {
      color: var(--page-primary-color);
    }

    .page-resources-is-tk88-popular-in-vietnam__grid {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
      gap: 30px;
      margin-top: 30px;
    }

    .page-resources-is-tk88-popular-in-vietnam__card {
      background-color: var(--page-background-light);
      border-radius: 8px;
      box-shadow: 0 4px 15px var(--page-shadow-light);
      padding: 25px;
      text-align: center;
      transition: transform 0.3s ease, box-shadow 0.3s ease;
      display: flex;
      flex-direction: column;
      align-items: center;
    }

    .page-resources-is-tk88-popular-in-vietnam__card:hover {
      transform: translateY(-5px);
      box-shadow: 0 6px 20px var(--page-shadow-medium);
    }

    .page-resources-is-tk88-popular-in-vietnam__card-icon {
      width: 80px;
      height: 80px;
      margin-bottom: 20px;
      max-width: 100%;
      height: auto;
      border-radius: 8px;
      object-fit: cover;
    }

    .page-resources-is-tk88-popular-in-vietnam__card-title {
      font-size: 1.5em;
      color: var(--page-primary-color);
      margin-bottom: 15px;
      font-weight: bold;
    }

    .page-resources-is-tk88-popular-in-vietnam__card-text {
      font-size: 0.95em;
      color: var(--page-text-color);
    }

    .page-resources-is-tk88-popular-in-vietnam__faq-section {
      background-color: var(--page-background-dark);
      padding: 40px 0;
      margin-bottom: 30px;
      border-radius: 8px;
      box-shadow: 0 2px 10px var(--page-shadow-light);
    }

    .page-resources-is-tk88-popular-in-vietnam__faq-item {
      background-color: var(--page-background-light);
      border: 1px solid var(--page-border-color);
      border-radius: 8px;
      margin-bottom: 15px;
      overflow: hidden;
      box-shadow: 0 2px 8px var(--page-shadow-light);
    }

    .page-resources-is-tk88-popular-in-vietnam__faq-question {
      display: flex;
      justify-content: space-between;
      align-items: center;
      padding: 18px 25px;
      cursor: pointer;
      background-color: var(--page-background-light);
      transition: background-color 0.3s ease;
      user-select: none;
    }

    .page-resources-is-tk88-popular-in-vietnam__faq-question:hover {
      background-color: var(--page-secondary-color);
    }

    .page-resources-is-tk88-popular-in-vietnam__faq-question h3 {
      margin: 0;
      font-size: 1.15em;
      color: var(--page-heading-color);
      pointer-events: none; /* Prevent text selection from interfering with click */
    }

    .page-resources-is-tk88-popular-in-vietnam__faq-toggle {
      font-size: 1.8em;
      font-weight: bold;
      color: var(--page-primary-color);
      transition: transform 0.3s ease;
      pointer-events: none; /* Prevent toggle icon from interfering with click */
    }

    .page-resources-is-tk88-popular-in-vietnam__faq-item.active .page-resources-is-tk88-popular-in-vietnam__faq-toggle {
      transform: rotate(45deg); /* Changes '+' to 'x' or '-' */
    }

    .page-resources-is-tk88-popular-in-vietnam__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;
      color: var(--page-text-color);
      opacity: 0;
    }

    .page-resources-is-tk88-popular-in-vietnam__faq-item.active .page-resources-is-tk88-popular-in-vietnam__faq-answer {
      max-height: 2000px !important; /* Sufficiently large to contain any content */
      padding: 20px 25px !important;
      opacity: 1;
    }

    .page-resources-is-tk88-popular-in-vietnam__faq-answer p {
      margin-bottom: 15px;
    }

    .page-resources-is-tk88-popular-in-vietnam__promotion-banner {
        background-color: var(--page-primary-color);
        color: #fff;
        text-align: center;
        padding: 30px 20px;
        margin-top: 40px;
        border-radius: 8px;
        box-shadow: 0 4px 15px var(--page-shadow-medium);
    }

    .page-resources-is-tk88-popular-in-vietnam__promotion-banner h3 {
        color: #ffc107;
        font-size: 2em;
        margin-bottom: 15px;
    }

    .page-resources-is-tk88-popular-in-vietnam__promotion-banner p {
        font-size: 1.1em;
        margin-bottom: 25px;
    }

    /* Responsive Design */
    @media (max-width: 992px) {
      .page-resources-is-tk88-popular-in-vietnam__hero-title {
        font-size: 2.4em;
      }
      .page-resources-is-tk88-popular-in-vietnam__section-title {
        font-size: 1.8em;
      }
    }

    @media (max-width: 768px) {
      .page-resources-is-tk88-popular-in-vietnam__hero-section {
        padding-top: 10px; /* Adjust for mobile fixed header */
        padding-bottom: 40px;
        margin-bottom: 20px;
      }
      .page-resources-is-tk88-popular-in-vietnam__hero-title {
        font-size: 2em;
      }
      .page-resources-is-tk88-popular-in-vietnam__hero-description {
        font-size: 1em;
        margin-bottom: 20px;
      }
      .page-resources-is-tk88-popular-in-vietnam__cta-button {
        padding: 10px 20px;
        font-size: 1em;
      }
      .page-resources-is-tk88-popular-in-vietnam__section-title {
        font-size: 1.6em;
        margin-bottom: 20px;
      }
      .page-resources-is-tk88-popular-in-vietnam__content-section {
        padding: 20px 0;
        margin-bottom: 20px;
      }
      .page-resources-is-tk88-popular-in-vietnam__text-block {
        font-size: 0.95em;
      }
      .page-resources-is-tk88-popular-in-vietnam__list-item {
        padding: 12px 15px;
        font-size: 0.9em;
      }
      .page-resources-is-tk88-popular-in-vietnam__card-title {
        font-size: 1.3em;
      }
      .page-resources-is-tk88-popular-in-vietnam__card-text {
        font-size: 0.85em;
      }
      .page-resources-is-tk88-popular-in-vietnam__faq-question {
        padding: 15px 20px;
      }
      .page-resources-is-tk88-popular-in-vietnam__faq-question h3 {
        font-size: 1em;
      }
      .page-resources-is-tk88-popular-in-vietnam__faq-toggle {
        font-size: 1.5em;
      }
      .page-resources-is-tk88-popular-in-vietnam__faq-answer {
        padding: 0 20px;
      }
      .page-resources-is-tk88-popular-in-vietnam__faq-item.active .page-resources-is-tk88-popular-in-vietnam__faq-answer {
        padding: 15px 20px !important;
      }
      .page-resources-is-tk88-popular-in-vietnam__image {
          max-width: 100% !important;
          height: auto !important;
      }
    }

    @media (max-width: 480px) {
      .page-resources-is-tk88-popular-in-vietnam__hero-title {
        font-size: 1.8em;
      }
      .page-resources-is-tk88-popular-in-vietnam__section-title {
        font-size: 1.4em;
      }
      .page-resources-is-tk88-popular-in-vietnam__grid {
        grid-template-columns: 1fr;
      }
    }