/* Tổng quan */
    .page-66-vn {
      font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
      color: #333;
      line-height: 1.6;
      background-color: #f9f9f9;
    }

    .page-66-vn__container {
      max-width: 1200px;
      margin: 0 auto;
      padding: 20px;
      box-sizing: border-box;
    }

    .page-66-vn__section {
      background-color: #fff;
      margin-bottom: 30px;
      padding: 30px;
      border-radius: 8px;
      box-shadow: 0 4px 12px rgba(0, 0, 0, 0.08);
    }

    .page-66-vn__section-title {
      font-size: 2.5em;
      color: #0056b3; /* Darker blue for headings */
      text-align: center;
      margin-bottom: 20px;
      font-weight: 700;
    }

    .page-66-vn__section-subtitle {
      font-size: 1.8em;
      color: #007bff; /* Blue for subheadings */
      text-align: center;
      margin-bottom: 20px;
      font-weight: 600;
    }

    .page-66-vn__text-center {
      text-align: center;
    }

    .page-66-vn__button {
      display: inline-block;
      background-color: #FF4500; /* OrangeRed for primary actions */
      color: #fff;
      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-sizing: border-box;
    }

    .page-66-vn__button:hover {
      background-color: #e63e00; /* Slightly darker orange */
      transform: translateY(-2px);
    }

    /* Hero Section */
    .page-66-vn__hero-section {
      background: linear-gradient(135deg, #007bff 0%, #0056b3 100%);
      color: #fff;
      padding: 80px 20px;
      text-align: center;
      border-radius: 0 0 15px 15px;
      margin-bottom: 30px;
      position: relative;
      overflow: hidden;
      padding-top: 10px; /* Adjust for shared header offset */
    }

    .page-66-vn__hero-title {
      font-size: 3.5em;
      margin-bottom: 15px;
      font-weight: 800;
      text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.3);
    }

    .page-66-vn__hero-subtitle {
      font-size: 1.5em;
      margin-bottom: 30px;
      font-weight: 300;
      max-width: 800px;
      margin-left: auto;
      margin-right: auto;
    }

    .page-66-vn__hero-image {
      width: 100%;
      max-width: 100%;
      height: auto;
      border-radius: 10px;
      box-shadow: 0 8px 20px rgba(0, 0, 0, 0.2);
      margin-top: 40px;
      display: block;
      margin-left: auto;
      margin-right: auto;
      box-sizing: border-box;
    }

    /* Floating Buttons */
    .page-66-vn__floating-buttons {
      position: fixed;
      bottom: 20px;
      right: 20px;
      display: flex;
      flex-direction: column;
      gap: 10px;
      z-index: 1000;
    }

    .page-66-vn__floating-button {
      background-color: #28a745; /* Green for register */
      color: #fff;
      padding: 12px 20px;
      border-radius: 30px;
      text-decoration: none;
      font-weight: bold;
      box-shadow: 0 4px 10px rgba(0, 0, 0, 0.2);
      transition: background-color 0.3s ease, transform 0.2s ease;
      border: none;
      cursor: pointer;
      font-size: 1em;
      text-align: center;
      box-sizing: border-box;
    }

    .page-66-vn__floating-button--login {
      background-color: #007bff; /* Blue for login */
    }

    .page-66-vn__floating-button:hover {
      transform: translateY(-3px);
      opacity: 0.9;
    }

    /* Product Display */
    .page-66-vn__product-grid {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
      gap: 25px;
      margin-top: 30px;
    }

    .page-66-vn__product-item {
      text-align: center;
      background-color: #fefefe;
      padding: 25px;
      border-radius: 10px;
      box-shadow: 0 2px 8px rgba(0, 0, 0, 0.05);
      transition: transform 0.3s ease, box-shadow 0.3s ease;
    }

    .page-66-vn__product-item:hover {
      transform: translateY(-5px);
      box-shadow: 0 6px 15px rgba(0, 0, 0, 0.1);
    }

    .page-66-vn__product-image {
      width: 100%;
      height: 200px;
      object-fit: cover;
      border-radius: 8px;
      margin-bottom: 15px;
      box-sizing: border-box;
      max-width: 100%;
    }

    .page-66-vn__product-title {
      font-size: 1.5em;
      color: #333;
      margin-bottom: 10px;
      font-weight: 600;
    }

    .page-66-vn__product-description {
      font-size: 0.95em;
      color: #555;
    }

    /* Promotions Section */
    .page-66-vn__promo-list {
      list-style: none;
      padding: 0;
      margin: 20px 0;
    }

    .page-66-vn__promo-item {
      background-color: #eaf6ff; /* Light blue background for promo items */
      border-left: 5px solid #007bff;
      padding: 20px;
      margin-bottom: 15px;
      border-radius: 5px;
      box-shadow: 0 1px 4px rgba(0, 0, 0, 0.05);
      box-sizing: border-box;
    }

    .page-66-vn__promo-item strong {
      color: #0056b3;
      font-size: 1.1em;
    }

    /* News Section */
    .page-66-vn__news-grid {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
      gap: 25px;
      margin-top: 30px;
    }

    .page-66-vn__news-card {
      background-color: #fefefe;
      border-radius: 10px;
      box-shadow: 0 2px 8px rgba(0, 0, 0, 0.05);
      overflow: hidden;
      transition: transform 0.3s ease, box-shadow 0.3s ease;
      display: flex;
      flex-direction: column;
    }

    .page-66-vn__news-card:hover {
      transform: translateY(-5px);
      box-shadow: 0 6px 15px rgba(0, 0, 0, 0.1);
    }

    .page-66-vn__news-image {
      width: 100%;
      height: 220px;
      object-fit: cover;
      display: block;
      box-sizing: border-box;
      max-width: 100%;
    }

    .page-66-vn__news-content {
      padding: 20px;
      flex-grow: 1;
    }

    .page-66-vn__news-title {
      font-size: 1.4em;
      color: #333;
      margin-bottom: 10px;
      font-weight: 600;
    }

    .page-66-vn__news-date {
      font-size: 0.85em;
      color: #777;
      margin-bottom: 10px;
      display: block;
    }

    .page-66-vn__news-excerpt {
      font-size: 0.95em;
      color: #555;
    }

    /* FAQ Section */
    .page-66-vn__faq-list {
      margin-top: 30px;
    }

    .page-66-vn__faq-item {
      background-color: #fefefe;
      margin-bottom: 15px;
      border-radius: 8px;
      overflow: hidden;
      box-shadow: 0 2px 6px rgba(0, 0, 0, 0.05);
      border: 1px solid #eee;
    }

    .page-66-vn__faq-question {
      display: flex;
      justify-content: space-between;
      align-items: center;
      padding: 20px 25px;
      background-color: #f1f1f1;
      cursor: pointer;
      user-select: none;
      font-size: 1.15em;
      font-weight: 600;
      color: #333;
      transition: background-color 0.3s ease;
    }

    .page-66-vn__faq-question:hover {
      background-color: #e0e0e0;
    }

    .page-66-vn__faq-question h3 {
      margin: 0;
      flex-grow: 1;
      pointer-events: none; /* Prevent h3 from blocking click */
      color: #0056b3;
    }

    .page-66-vn__faq-toggle {
      font-size: 1.8em;
      font-weight: bold;
      color: #007bff;
      margin-left: 15px;
      pointer-events: none; /* Prevent toggle from blocking click */
      transition: transform 0.3s ease;
    }

    .page-66-vn__faq-item.active .page-66-vn__faq-toggle {
      transform: rotate(45deg); /* Plus sign rotates to a cross */
    }

    .page-66-vn__faq-answer {
      max-height: 0;
      overflow: hidden;
      padding: 0 25px;
      opacity: 0;
      transition: max-height 0.4s cubic-bezier(0.4, 0, 0.2, 1), padding 0.4s ease, opacity 0.4s ease;
      background-color: #fff;
      color: #555;
    }

    .page-66-vn__faq-item.active .page-66-vn__faq-answer {
      max-height: 2000px !important; /* Sufficiently large to contain content */
      padding: 20px 25px !important;
      opacity: 1;
    }

    /* Call to Action Section */
    .page-66-vn__cta-section {
      text-align: center;
      padding: 40px 20px;
      background-color: #007bff;
      color: #fff;
      border-radius: 8px;
      box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
    }

    .page-66-vn__cta-title {
      font-size: 2.2em;
      margin-bottom: 15px;
      font-weight: 700;
    }

    .page-66-vn__cta-description {
      font-size: 1.1em;
      margin-bottom: 30px;
      max-width: 700px;
      margin-left: auto;
      margin-right: auto;
    }

    .page-66-vn__cta-button-group {
      display: flex;
      justify-content: center;
      gap: 20px;
      flex-wrap: wrap;
    }

    .page-66-vn__cta-button {
      background-color: #FF4500;
      color: #fff;
      padding: 14px 30px;
      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: 1.1em;
      box-sizing: border-box;
    }

    .page-66-vn__cta-button:hover {
      background-color: #e63e00;
      transform: translateY(-2px);
    }

    .page-66-vn__external-promo-link {
      color: #fff;
      text-decoration: underline;
      margin-top: 20px;
      display: block;
      font-size: 0.9em;
      transition: color 0.3s ease;
    }

    .page-66-vn__external-promo-link:hover {
      color: #f0f0f0;
    }

    /* Responsive adjustments */
    @media (max-width: 768px) {
      .page-66-vn__container {
        padding: 15px;
      }

      .page-66-vn__section {
        padding: 20px;
      }

      .page-66-vn__section-title {
        font-size: 2em;
      }

      .page-66-vn__section-subtitle {
        font-size: 1.5em;
      }

      .page-66-vn__hero-section {
        padding: 60px 15px;
      }

      .page-66-vn__hero-title {
        font-size: 2.5em;
      }

      .page-66-vn__hero-subtitle {
        font-size: 1.2em;
      }

      .page-66-vn__product-grid,
      .page-66-vn__news-grid {
        grid-template-columns: 1fr;
      }

      .page-66-vn__product-item,
      .page-66-vn__news-card {
        width: 100% !important;
        max-width: 100% !important;
        box-sizing: border-box !important;
        margin-left: 0 !important;
        margin-right: 0 !important;
      }

      .page-66-vn__promo-list,
      .page-66-vn__faq-list {
        width: 100% !important;
        max-width: 100% !important;
        box-sizing: border-box !important;
        padding: 0 !important;
        margin-left: 0 !important;
        margin-right: 0 !important;
      }

      .page-66-vn__promo-item,
      .page-66-vn__faq-item {
        width: 100% !important;
        max-width: 100% !important;
        box-sizing: border-box !important;
        margin-left: 0 !important;
        margin-right: 0 !important;
        padding: 15px !important;
        word-wrap: break-word !important;
        overflow-wrap: break-word !important;
        word-break: break-word !important;
      }

      .page-66-vn__product-image,
      .page-66-vn__news-image,
      .page-66-vn__hero-image {
        max-width: 100% !important;
        height: auto !important;
        box-sizing: border-box !important;
      }

      .page-66-vn__floating-buttons {
        bottom: 15px;
        right: 15px;
        flex-direction: row; /* Stack horizontally on small screens */
        width: calc(100% - 30px);
        justify-content: center;
      }

      .page-66-vn__floating-button {
        flex: 1;
        padding: 10px 15px;
        font-size: 0.95em;
      }

      .page-66-vn__faq-question {
        font-size: 1em;
        padding: 15px 20px;
      }

      .page-66-vn__faq-answer {
        padding: 0 20px;
      }

      .page-66-vn__faq-item.active .page-66-vn__faq-answer {
        padding: 15px 20px !important;
      }

      .page-66-vn__cta-title {
        font-size: 1.8em;
      }

      .page-66-vn__cta-description {
        font-size: 1em;
      }

      .page-66-vn__cta-button {
        width: 100%;
        max-width: 250px;
      }
    }

    @media (max-width: 480px) {
      .page-66-vn__hero-title {
        font-size: 2em;
      }

      .page-66-vn__hero-subtitle {
        font-size: 1em;
      }

      .page-66-vn__section-title {
        font-size: 1.8em;
      }

      .page-66-vn__floating-buttons {
        flex-direction: column; /* Stack vertically again if too small */
      }
    }