:root {
      --page-138vn-primary-color: #e02b2b; /* Đỏ rực */
      --page-138vn-secondary-color: #ffc107; /* Vàng hổ phách */
      --page-138vn-dark-background: #1a1a1a; /* Nền tối */
      --page-138vn-light-text: #ffffff; /* Chữ trắng */
      --page-138vn-gray-text: #cccccc; /* Chữ xám nhạt */
      --page-138vn-border-color: #333333; /* Màu viền */
      --page-138vn-accent-color: #28a745; /* Xanh lá cây */
    }

    .page-138vn {
      font-family: 'Arial', sans-serif;
      color: var(--page-138vn-light-text);
      background-color: var(--page-138vn-dark-background);
      line-height: 1.6;
      padding-top: var(--header-offset, 122px); /* Fallback for header offset */
    }

    .page-138vn__container {
      max-width: 1200px;
      margin: 0 auto;
      padding: 0 15px;
      box-sizing: border-box;
    }

    .page-138vn__section {
      padding: 40px 0;
      text-align: center;
    }

    .page-138vn__section--dark {
      background-color: #222222;
    }

    .page-138vn__section-title {
      font-size: 2.5em;
      color: var(--page-138vn-primary-color);
      margin-bottom: 20px;
      text-transform: uppercase;
      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-secondary-color);
      border-radius: 2px;
    }

    .page-138vn__hero-section {
      position: relative;
      min-height: 400px;
      display: flex;
      align-items: center;
      justify-content: center;
      overflow: hidden;
      padding: 10px 0 60px; /* Small padding-top as body already has offset */
      background: linear-gradient(135deg, #1a1a1a, #333333);
    }

    .page-138vn__hero-background {
      position: absolute;
      top: 0;
      left: 0;
      width: 100%;
      height: 100%;
      object-fit: cover;
      z-index: 0;
      opacity: 0.3;
    }

    .page-138vn__hero-content {
      position: relative;
      z-index: 1;
      text-align: center;
      padding: 20px;
    }

    .page-138vn__hero-title {
      font-size: 3.5em;
      color: var(--page-138vn-primary-color);
      margin-bottom: 15px;
      text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.7);
      line-height: 1.2;
    }

    .page-138vn__hero-subtitle {
      font-size: 1.5em;
      color: var(--page-138vn-light-text);
      margin-bottom: 30px;
      max-width: 800px;
      margin-left: auto;
      margin-right: auto;
    }

    .page-138vn__button-group {
      display: flex;
      gap: 20px;
      justify-content: center;
    }

    .page-138vn__button {
      background-color: var(--page-138vn-primary-color);
      color: var(--page-138vn-light-text);
      padding: 12px 25px;
      border-radius: 5px;
      text-decoration: none;
      font-weight: bold;
      transition: background-color 0.3s ease, transform 0.2s ease;
      border: none;
      cursor: pointer;
      font-size: 1em;
      box-shadow: 0 4px 10px rgba(0, 0, 0, 0.3);
    }

    .page-138vn__button:hover {
      background-color: #ff4d4d;
      transform: translateY(-2px);
    }

    .page-138vn__floating-buttons {
      position: fixed;
      top: 50%;
      right: 15px;
      transform: translateY(-50%);
      display: flex;
      flex-direction: column;
      gap: 15px;
      z-index: 1000;
    }

    .page-138vn__floating-button {
      background-color: var(--page-138vn-primary-color);
      color: var(--page-138vn-light-text);
      padding: 10px 15px;
      border-radius: 8px;
      text-align: center;
      font-weight: bold;
      box-shadow: 0 4px 10px rgba(0, 0, 0, 0.4);
      transition: background-color 0.3s ease, transform 0.2s ease;
      cursor: pointer;
      font-size: 0.9em;
      text-transform: uppercase;
      border: 2px solid var(--page-138vn-secondary-color);
      min-width: 80px;
    }

    .page-138vn__floating-button:hover {
      background-color: #ff4d4d;
      transform: scale(1.05);
    }

    .page-138vn__product-grid {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
      gap: 30px;
      margin-top: 40px;
    }

    .page-138vn__product-card {
      background-color: #2a2a2a;
      border-radius: 10px;
      overflow: hidden;
      box-shadow: 0 5px 15px rgba(0, 0, 0, 0.4);
      transition: transform 0.3s ease, box-shadow 0.3s ease;
      text-align: left;
      border: 1px solid var(--page-138vn-border-color);
    }

    .page-138vn__product-card:hover {
      transform: translateY(-8px);
      box-shadow: 0 8px 25px rgba(0, 0, 0, 0.6);
    }

    .page-138vn__product-image {
      width: 100%;
      height: 200px;
      object-fit: cover;
      display: block;
      border-bottom: 1px solid var(--page-138vn-border-color);
    }

    .page-138vn__product-content {
      padding: 20px;
    }

    .page-138vn__product-title {
      font-size: 1.5em;
      color: var(--page-138vn-secondary-color);
      margin-bottom: 10px;
    }

    .page-138vn__product-description {
      color: var(--page-138vn-gray-text);
      font-size: 0.95em;
    }

    .page-138vn__features-list {
      display: flex;
      flex-wrap: wrap;
      justify-content: center;
      gap: 20px;
      margin-top: 40px;
      list-style: none;
      padding: 0;
    }

    .page-138vn__feature-item {
      background-color: #2a2a2a;
      border-radius: 10px;
      padding: 25px;
      flex: 1 1 calc(33% - 40px);
      max-width: calc(33% - 40px);
      box-shadow: 0 4px 12px rgba(0, 0, 0, 0.3);
      text-align: center;
      border: 1px solid var(--page-138vn-border-color);
      box-sizing: border-box; /* Ensure padding and border are included in width */
    }

    .page-138vn__feature-icon {
      width: 80px;
      height: 80px;
      object-fit: contain;
      margin-bottom: 15px;
      display: block;
      margin-left: auto;
      margin-right: auto;
    }

    .page-138vn__feature-title {
      font-size: 1.3em;
      color: var(--page-138vn-primary-color);
      margin-bottom: 10px;
    }

    .page-138vn__feature-description {
      color: var(--page-138vn-gray-text);
      font-size: 0.9em;
    }

    .page-138vn__promotion-grid {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
      gap: 30px;
      margin-top: 40px;
    }

    .page-138vn__promotion-card {
      background-color: #2a2a2a;
      border-radius: 10px;
      overflow: hidden;
      box-shadow: 0 5px 15px rgba(0, 0, 0, 0.4);
      transition: transform 0.3s ease, box-shadow 0.3s ease;
      text-align: left;
      border: 1px solid var(--page-138vn-border-color);
    }

    .page-138vn__promotion-card:hover {
      transform: translateY(-8px);
      box-shadow: 0 8px 25px rgba(0, 0, 0, 0.6);
    }

    .page-138vn__promotion-image {
      width: 100%;
      height: 220px;
      object-fit: cover;
      display: block;
      border-bottom: 1px solid var(--page-138vn-border-color);
    }

    .page-138vn__promotion-content {
      padding: 20px;
    }

    .page-138vn__promotion-title {
      font-size: 1.4em;
      color: var(--page-138vn-secondary-color);
      margin-bottom: 10px;
    }

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

    .page-138vn__promotion-button {
      background-color: var(--page-138vn-accent-color);
      color: var(--page-138vn-light-text);
      padding: 10px 20px;
      border-radius: 5px;
      text-decoration: none;
      font-weight: bold;
      transition: background-color 0.3s ease;
      display: inline-block;
      border: none;
      cursor: pointer;
    }

    .page-138vn__promotion-button:hover {
      background-color: #218838;
    }

    .page-138vn__providers-list,
    .page-138vn__payments-list,
    .page-138vn__social-list {
      display: flex;
      flex-wrap: wrap;
      justify-content: center;
      gap: 20px;
      margin-top: 40px;
      list-style: none;
      padding: 0;
    }

    .page-138vn__provider-item,
    .page-138vn__payment-item,
    .page-138vn__social-item {
      background-color: #2a2a2a;
      border-radius: 8px;
      padding: 15px 25px;
      box-shadow: 0 2px 8px rgba(0, 0, 0, 0.3);
      transition: transform 0.2s ease;
      display: flex;
      align-items: center;
      justify-content: center;
      border: 1px solid var(--page-138vn-border-color);
      box-sizing: border-box; /* Ensure padding and border are included in width */
      flex: 1 1 auto; /* Allow items to grow/shrink */
      max-width: 180px; /* Limit max width for larger screens */
    }

    .page-138vn__provider-item:hover,
    .page-138vn__payment-item:hover,
    .page-138vn__social-item:hover {
      transform: translateY(-5px);
    }

    .page-138vn__provider-logo,
    .page-138vn__payment-logo,
    .page-138vn__social-icon {
      max-width: 100px;
      height: 40px;
      object-fit: contain;
      display: block;
    }
    
    .page-138vn__payment-logo {
      max-width: 80px;
    }

    .page-138vn__faq-list {
      margin-top: 40px;
      text-align: left;
    }

    .page-138vn__faq-item {
      background-color: #2a2a2a;
      border-radius: 8px;
      margin-bottom: 15px;
      border: 1px solid var(--page-138vn-border-color);
      overflow: hidden;
      box-shadow: 0 2px 8px rgba(0, 0, 0, 0.3);
    }

    .page-138vn__faq-question {
      display: flex;
      justify-content: space-between;
      align-items: center;
      padding: 15px 20px;
      cursor: pointer;
      background-color: #333333;
      border-bottom: 1px solid var(--page-138vn-border-color);
      transition: background-color 0.3s ease;
      user-select: none;
    }

    .page-138vn__faq-question:hover {
      background-color: #444444;
    }

    .page-138vn__faq-question h3 {
      margin: 0;
      font-size: 1.1em;
      color: var(--page-138vn-light-text);
      pointer-events: none; /* Prevent h3 from blocking click on parent */
    }

    .page-138vn__faq-toggle {
      font-size: 1.5em;
      font-weight: bold;
      color: var(--page-138vn-secondary-color);
      transition: transform 0.3s ease;
      pointer-events: none; /* Prevent toggle icon from blocking click on parent */
    }

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

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

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

    .page-138vn__cta-section {
      background: linear-gradient(90deg, #1a1a1a, #333333);
      padding: 60px 0;
      margin-top: 40px;
    }

    .page-138vn__cta-title {
      font-size: 2.2em;
      color: var(--page-138vn-primary-color);
      margin-bottom: 15px;
    }

    .page-138vn__cta-description {
      font-size: 1.2em;
      color: var(--page-138vn-light-text);
      margin-bottom: 30px;
      max-width: 800px;
      margin-left: auto;
      margin-right: auto;
    }

    .page-138vn__news-grid {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
      gap: 30px;
      margin-top: 40px;
    }

    .page-138vn__news-card {
      background-color: #2a2a2a;
      border-radius: 10px;
      overflow: hidden;
      box-shadow: 0 5px 15px rgba(0, 0, 0, 0.4);
      transition: transform 0.3s ease, box-shadow 0.3s ease;
      text-align: left;
      border: 1px solid var(--page-138vn-border-color);
    }

    .page-138vn__news-card:hover {
      transform: translateY(-8px);
      box-shadow: 0 8px 25px rgba(0, 0, 0, 0.6);
    }

    .page-138vn__news-image {
      width: 100%;
      height: 200px;
      object-fit: cover;
      display: block;
      border-bottom: 1px solid var(--page-138vn-border-color);
    }

    .page-138vn__news-content {
      padding: 20px;
    }

    .page-138vn__news-title {
      font-size: 1.4em;
      color: var(--page-138vn-secondary-color);
      margin-bottom: 10px;
    }

    .page-138vn__news-date {
      font-size: 0.85em;
      color: var(--page-138vn-gray-text);
      margin-bottom: 10px;
    }

    .page-138vn__news-excerpt {
      color: var(--page-138vn-gray-text);
      font-size: 0.9em;
    }

    /* Responsive adjustments */
    @media (max-width: 1024px) {
      .page-138vn__hero-title {
        font-size: 3em;
      }
      .page-138vn__hero-subtitle {
        font-size: 1.3em;
      }
      .page-138vn__feature-item {
        flex: 1 1 calc(50% - 30px);
        max-width: calc(50% - 30px);
      }
    }

    @media (max-width: 768px) {
      .page-138vn__hero-title {
        font-size: 2.2em;
      }
      .page-138vn__hero-subtitle {
        font-size: 1.1em;
      }
      .page-138vn__section-title {
        font-size: 2em;
      }
      .page-138vn__button-group {
        flex-direction: column;
        gap: 15px;
      }
      .page-138vn__button {
        width: 100%;
      }
      .page-138vn__floating-buttons {
        flex-direction: row;
        width: 100%;
        bottom: 0;
        top: auto;
        left: 0;
        right: 0;
        transform: translateY(0);
        padding: 10px 15px;
        justify-content: space-around;
        background-color: rgba(26, 26, 26, 0.95);
        border-top: 1px solid var(--page-138vn-border-color);
      }
      .page-138vn__floating-button {
        flex: 1;
        padding: 8px 10px;
        font-size: 0.8em;
        min-width: unset;
      }

      .page-138vn__feature-item,
      .page-138vn__provider-item,
      .page-138vn__payment-item,
      .page-138vn__social-item {
        width: 100% !important;
        max-width: 100% !important;
        box-sizing: border-box !important;
        margin-left: 0 !important;
        margin-right: 0 !important;
        word-wrap: break-word !important;
        overflow-wrap: break-word !important;
      }

      .page-138vn__features-list,
      .page-138vn__providers-list,
      .page-138vn__payments-list,
      .page-138vn__social-list {
        width: 100% !important;
        max-width: 100% !important;
        box-sizing: border-box !important;
        padding: 0 10px !important; /* Adjust padding for mobile */
        margin-left: 0 !important;
        margin-right: 0 !important;
        justify-content: space-around;
        gap: 15px;
      }

      .page-138vn__product-image,
      .page-138vn__promotion-image,
      .page-138vn__news-image,
      .page-138vn__feature-icon,
      .page-138vn__provider-logo,
      .page-138vn__payment-logo,
      .page-138vn__social-icon {
        max-width: 100% !important;
        height: auto !important;
        box-sizing: border-box !important;
      }

      .page-138vn__product-grid,
      .page-138vn__promotion-grid,
      .page-138vn__news-grid {
        grid-template-columns: 1fr;
        gap: 20px;
      }

      .page-138vn__hero-section {
        min-height: 300px;
        padding-bottom: 100px; /* Space for fixed buttons */
      }
    }

    @media (max-width: 480px) {
      .page-138vn__hero-title {
        font-size: 1.8em;
      }
      .page-138vn__hero-subtitle {
        font-size: 1em;
      }
      .page-138vn__section-title {
        font-size: 1.8em;
      }
      .page-138vn__section {
        padding: 30px 0;
      }
      .page-138vn__floating-button {
        font-size: 0.75em;
        padding: 6px 8px;
      }
    }