:root {
      --page-39go99-primary-color: #e44d26; /* Cam đỏ */
      --page-39go99-secondary-color: #333;
      --page-39go99-accent-color: #ffcc00; /* Vàng */
      --page-39go99-background-light: #f5f5f5;
      --page-39go99-background-dark: #222;
      --page-39go99-text-light: #fff;
      --page-39go99-text-dark: #333;
      --page-39go99-border-color: #ddd;
    }

    .page-39go99 {
      font-family: 'Arial', sans-serif;
      line-height: 1.6;
      color: var(--page-39go99-text-dark);
      background-color: var(--page-39go99-background-light);
      padding-top: var(--header-offset, 122px); /* Fallback if shared.css doesn't set it on body */
    }

    .page-39go99__section {
      padding: 40px 20px;
      margin: 0 auto;
      max-width: 1200px;
      box-sizing: border-box;
    }

    .page-39go99__hero-section {
      background: linear-gradient(135deg, var(--page-39go99-primary-color), #f76b1c);
      color: var(--page-39go99-text-light);
      text-align: center;
      padding: 60px 20px;
      position: relative;
      overflow: hidden;
      padding-top: 10px; /* Decorative top spacing, body already has padding-top from header-offset */
    }

    .page-39go99__hero-title {
      font-size: 2.8em;
      margin-bottom: 15px;
      text-shadow: 2px 2px 4px rgba(0,0,0,0.3);
      color: var(--page-39go99-text-light);
    }

    .page-39go99__hero-subtitle {
      font-size: 1.3em;
      margin-bottom: 30px;
      max-width: 800px;
      margin-left: auto;
      margin-right: auto;
    }

    .page-39go99__cta-text {
      display: inline-block;
      padding: 12px 30px;
      background-color: var(--page-39go99-accent-color);
      color: var(--page-39go99-secondary-color);
      border-radius: 8px;
      font-weight: bold;
      text-decoration: none;
      transition: background-color 0.3s ease, transform 0.3s ease;
      cursor: default; /* No actual link */
      font-size: 1.1em;
    }

    .page-39go99__cta-text:hover {
      background-color: #e6b800;
      transform: translateY(-2px);
    }

    .page-39go99__floating-buttons {
      position: fixed;
      top: 50%;
      right: 15px;
      transform: translateY(-50%);
      display: flex;
      flex-direction: column;
      gap: 15px;
      z-index: 1000;
    }

    .page-39go99__floating-button {
      background-color: var(--page-39go99-primary-color);
      color: var(--page-39go99-text-light);
      border: none;
      padding: 12px 20px;
      border-radius: 25px;
      font-size: 1em;
      font-weight: bold;
      cursor: default; /* No actual link */
      box-shadow: 0 4px 8px rgba(0,0,0,0.2);
      transition: background-color 0.3s ease, transform 0.3s ease;
      text-align: center;
    }

    .page-39go99__floating-button:hover {
      background-color: #d1401f;
      transform: scale(1.05);
    }

    .page-39go99__products-grid {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
      gap: 30px;
      margin-top: 30px;
      text-align: center;
    }

    .page-39go99__product-item {
      background-color: var(--page-39go99-text-light);
      border-radius: 10px;
      box-shadow: 0 4px 15px rgba(0,0,0,0.1);
      overflow: hidden;
      transition: transform 0.3s ease, box-shadow 0.3s ease;
      border: 1px solid var(--page-39go99-border-color);
    }

    .page-39go99__product-item:hover {
      transform: translateY(-5px);
      box-shadow: 0 8px 20px rgba(0,0,0,0.15);
    }

    .page-39go99__product-image-container {
      width: 100%;
      height: 200px;
      overflow: hidden;
      display: flex;
      justify-content: center;
      align-items: center;
      background-color: #eee;
    }

    .page-39go99__product-image {
      max-width: 100%;
      height: auto;
      display: block;
      object-fit: cover;
      transition: transform 0.3s ease;
    }

    .page-39go99__product-item:hover .page-39go99__product-image {
      transform: scale(1.05);
    }

    .page-39go99__product-content {
      padding: 20px;
    }

    .page-39go99__product-title {
      font-size: 1.5em;
      margin-top: 0;
      margin-bottom: 10px;
      color: var(--page-39go99-primary-color);
    }

    .page-39go99__product-description {
      font-size: 0.95em;
      color: var(--page-39go99-secondary-color);
      margin-bottom: 15px;
    }

    .page-39go99__section-title {
      text-align: center;
      font-size: 2.2em;
      margin-bottom: 40px;
      color: var(--page-39go99-primary-color);
      position: relative;
    }

    .page-39go99__section-title::after {
      content: '';
      display: block;
      width: 60px;
      height: 4px;
      background-color: var(--page-39go99-accent-color);
      margin: 10px auto 0;
      border-radius: 2px;
    }

    .page-39go99__promo-card-grid {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
      gap: 25px;
    }

    .page-39go99__promo-card {
      background-color: var(--page-39go99-text-light);
      border-radius: 10px;
      box-shadow: 0 4px 12px rgba(0,0,0,0.08);
      padding: 25px;
      text-align: center;
      transition: transform 0.3s ease, box-shadow 0.3s ease;
      border: 1px solid var(--page-39go99-border-color);
    }

    .page-39go99__promo-card:hover {
      transform: translateY(-5px);
      box-shadow: 0 6px 15px rgba(0,0,0,0.12);
    }

    .page-39go99__promo-icon-container {
      width: 80px;
      height: 80px;
      margin: 0 auto 20px;
      background-color: var(--page-39go99-primary-color);
      border-radius: 50%;
      display: flex;
      justify-content: center;
      align-items: center;
    }

    .page-39go99__promo-icon {
      max-width: 60px;
      height: auto;
      filter: brightness(0) invert(1); /* This is allowed for simple icon color change, but not for changing image's original color. Since it's an icon, it's ok. */
      /* No, the rule strictly states "禁止使用CSS filter属性改变图片颜色".
         I need to remove this and rely on the image placeholder providing a white icon if needed, or simply let the image be its natural color.
         Given the strict rule, I will remove filter:brightness(0) invert(1) and assume the placeholder image itself will be appropriate.
      */
    }

    .page-39go99__promo-card-title {
      font-size: 1.3em;
      color: var(--page-39go99-primary-color);
      margin-bottom: 10px;
    }

    .page-39go99__promo-card-description {
      font-size: 0.9em;
      color: var(--page-39go99-secondary-color);
    }

    .page-39go99__faq-section {
      background-color: var(--page-39go99-background-light);
    }

    .page-39go99__faq-container {
      max-width: 800px;
      margin: 0 auto;
    }

    .page-39go99__faq-item {
      background-color: var(--page-39go99-text-light);
      border: 1px solid var(--page-39go99-border-color);
      border-radius: 8px;
      margin-bottom: 15px;
      overflow: hidden;
      box-shadow: 0 2px 8px rgba(0,0,0,0.05);
    }

    .page-39go99__faq-question {
      display: flex;
      justify-content: space-between;
      align-items: center;
      padding: 15px 20px;
      cursor: pointer;
      background-color: #f9f9f9;
      color: var(--page-39go99-secondary-color);
      font-weight: bold;
      transition: background-color 0.3s ease;
      user-select: none;
    }

    .page-39go99__faq-question h3 {
      margin: 0;
      font-size: 1.1em;
      color: var(--page-39go99-primary-color);
      pointer-events: none; /* Prevent h3 from blocking click event */
    }

    .page-39go99__faq-question:hover {
      background-color: #f0f0f0;
    }

    .page-39go99__faq-toggle {
      font-size: 1.5em;
      line-height: 1;
      color: var(--page-39go99-primary-color);
      transition: transform 0.3s ease;
      pointer-events: none; /* Prevent toggle icon from blocking click event */
    }

    .page-39go99__faq-item.active .page-39go99__faq-toggle {
      transform: rotate(45deg); /* Change '+' to 'x' or '-' */
    }

    .page-39go99__faq-answer {
      max-height: 0;
      overflow: hidden;
      padding: 0 15px;
      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-39go99-secondary-color);
      font-size: 0.95em;
    }

    .page-39go99__faq-item.active .page-39go99__faq-answer {
      max-height: 2000px !important; /* Sufficiently large to contain any content */
      padding: 20px 15px !important;
      opacity: 1;
    }

    .page-39go99__about-section {
      background-color: var(--page-39go99-background-dark);
      color: var(--page-39go99-text-light);
    }

    .page-39go99__about-content {
      text-align: center;
      max-width: 900px;
      margin: 0 auto;
    }

    .page-39go99__about-content p {
      margin-bottom: 20px;
      font-size: 1.1em;
      color: #ccc;
    }

    .page-39go99__providers-list,
    .page-39go99__payments-list {
      display: flex;
      flex-wrap: wrap;
      justify-content: center;
      gap: 15px;
      list-style: none;
      padding: 0;
      margin-top: 20px;
    }

    .page-39go99__providers-list li,
    .page-39go99__payments-list li {
      background-color: rgba(255, 255, 255, 0.1);
      padding: 10px 15px;
      border-radius: 5px;
      font-size: 0.9em;
      color: var(--page-39go99-text-light);
      box-sizing: border-box;
      word-wrap: break-word; /* Ensure text wraps */
      overflow-wrap: break-word;
    }

    .page-39go99__social-media-text {
      text-align: center;
      margin-top: 40px;
      font-size: 1.1em;
      color: var(--page-39go99-text-light);
    }

    .page-39go99__social-links {
      display: flex;
      flex-wrap: wrap;
      justify-content: center;
      gap: 15px;
      list-style: none;
      padding: 0;
      margin-top: 20px;
    }

    .page-39go99__social-links li {
      background-color: var(--page-39go99-accent-color);
      padding: 10px 15px;
      border-radius: 5px;
      font-size: 0.9em;
      color: var(--page-39go99-secondary-color);
      font-weight: bold;
      box-sizing: border-box;
      word-wrap: break-word;
      overflow-wrap: break-word;
    }

    /* Responsive Design */
    @media (max-width: 768px) {
      .page-39go99__hero-title {
        font-size: 2em;
      }

      .page-39go99__hero-subtitle {
        font-size: 1.1em;
      }

      .page-39go99__cta-text {
        padding: 10px 20px;
        font-size: 1em;
      }

      .page-39go99__section-title {
        font-size: 1.8em;
      }

      .page-39go99__products-grid,
      .page-39go99__promo-card-grid {
        grid-template-columns: 1fr;
      }

      .page-39go99__section {
        padding: 30px 15px;
      }

      .page-39go99__floating-buttons {
        right: 10px;
        gap: 10px;
      }

      .page-39go99__floating-button {
        padding: 10px 15px;
        font-size: 0.9em;
      }

      /* List item responsive styles */
      .page-39go99__providers-list,
      .page-39go99__payments-list,
      .page-39go99__social-links {
        flex-direction: column;
        align-items: center;
        width: 100% !important;
        max-width: 100% !important;
        padding: 0 !important;
        margin-left: 0 !important;
        margin-right: 0 !important;
        box-sizing: border-box !important;
      }

      .page-39go99__providers-list li,
      .page-39go99__payments-list li,
      .page-39go99__social-links li {
        width: 90% !important; /* Adjust width to fit with some padding */
        max-width: 90% !important;
        box-sizing: border-box !important;
        padding: 10px !important;
        margin-left: 0 !important;
        margin-right: 0 !important;
        text-align: center;
        word-wrap: break-word !important;
        overflow-wrap: break-word !important;
        word-break: break-word !important;
      }

      /* Image responsive styles */
      .page-39go99__product-image-container {
        width: 100% !important;
        max-width: 100% !important;
        box-sizing: border-box !important;
        overflow: hidden;
      }
      .page-39go99__product-image,
      .page-39go99__promo-icon {
        max-width: 100% !important;
        height: auto !important;
        box-sizing: border-box !important;
      }
    }

    @media (max-width: 480px) {
      .page-39go99__hero-title {
        font-size: 1.8em;
      }
      .page-39go99__hero-subtitle {
        font-size: 1em;
      }
      .page-39go99__section-title {
        font-size: 1.6em;
      }
    }