/* Reset và cơ bản */
    .page-0k9 {
      font-family: 'Arial', sans-serif;
      color: #333;
      line-height: 1.6;
      background-color: #f8f8f8;
      padding-top: var(--header-offset, 122px); /* Fallback for header offset */
    }

    /* Tiêu đề chung */
    .page-0k9__section-title {
      font-size: 2.5em;
      color: #0056b3;
      text-align: center;
      margin-bottom: 40px;
      position: relative;
      padding-bottom: 10px;
      font-weight: bold;
    }

    .page-0k9__section-title::after {
      content: '';
      position: absolute;
      left: 50%;
      bottom: 0;
      transform: translateX(-50%);
      width: 80px;
      height: 4px;
      background-color: #ffc107;
      border-radius: 2px;
    }

    /* Container chung */
    .page-0k9__container {
      max-width: 1200px;
      margin: 0 auto;
      padding: 0 20px;
      box-sizing: border-box;
    }

    /* Hero Section */
    .page-0k9__hero-section {
      position: relative;
      text-align: center;
      color: #fff;
      padding: 100px 0 80px;
      overflow: hidden;
      background-color: #007bff; /* Fallback color */
      padding-top: 10px; /* Small decorative padding, body handles main offset */
    }

    .page-0k9__hero-background {
      position: absolute;
      top: 0;
      left: 0;
      width: 100%;
      height: 100%;
      object-fit: cover;
      z-index: 1;
      opacity: 0.8;
    }

    .page-0k9__hero-content {
      position: relative;
      z-index: 2;
      max-width: 900px;
      margin: 0 auto;
      padding: 20px;
      background-color: rgba(0, 0, 0, 0.4);
      border-radius: 10px;
    }

    .page-0k9__hero-title {
      font-size: 3.5em;
      margin-bottom: 20px;
      font-weight: 700;
      color: #ffc107;
    }

    .page-0k9__hero-description {
      font-size: 1.3em;
      margin-bottom: 30px;
      max-width: 700px;
      margin-left: auto;
      margin-right: auto;
    }

    .page-0k9__hero-button {
      display: inline-block;
      background-color: #ffc107;
      color: #333;
      padding: 15px 30px;
      border-radius: 50px;
      text-decoration: none;
      font-size: 1.2em;
      font-weight: bold;
      transition: background-color 0.3s ease, transform 0.3s ease;
      border: none;
      cursor: pointer;
    }

    .page-0k9__hero-button:hover {
      background-color: #e0a800;
      transform: translateY(-3px);
    }

    /* Floating Buttons */
    .page-0k9__floating-buttons {
      position: fixed;
      bottom: 20px;
      right: 20px;
      z-index: 1000;
      display: flex;
      flex-direction: column;
      gap: 10px;
    }

    .page-0k9__floating-button {
      display: block;
      background-color: #28a745; /* Green for Register */
      color: #fff;
      padding: 12px 25px;
      border-radius: 30px;
      text-decoration: none;
      font-size: 1.1em;
      font-weight: bold;
      text-align: center;
      box-shadow: 0 4px 8px rgba(0, 0, 0, 0.2);
      transition: background-color 0.3s ease, transform 0.3s ease;
      border: none;
      cursor: pointer;
    }

    .page-0k9__floating-button:nth-child(2) {
      background-color: #007bff; /* Blue for Login */
    }

    .page-0k9__floating-button:hover {
      transform: translateY(-3px);
      filter: brightness(1.1);
    }

    /* Giới Thiệu Section */
    .page-0k9__about-section {
      padding: 60px 0;
      background-color: #fff;
    }

    .page-0k9__about-content {
      display: flex;
      align-items: center;
      gap: 40px;
      flex-wrap: wrap;
    }

    .page-0k9__about-text {
      flex: 1;
      min-width: 300px;
    }

    .page-0k9__about-text h2 {
      font-size: 2em;
      color: #0056b3;
      margin-bottom: 20px;
    }

    .page-0k9__about-text p {
      margin-bottom: 15px;
      font-size: 1.1em;
    }

    .page-0k9__about-image-wrapper {
      flex: 1;
      min-width: 300px;
      text-align: center;
    }

    .page-0k9__about-image {
      max-width: 100%;
      height: auto;
      border-radius: 10px;
      box-shadow: 0 8px 16px rgba(0, 0, 0, 0.1);
    }

    /* Sản Phẩm Nổi Bật Section */
    .page-0k9__products-section {
      padding: 60px 0;
      background-color: #f1f1f1;
    }

    .page-0k9__product-grid {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
      gap: 30px;
      justify-content: center;
    }

    .page-0k9__product-card {
      background-color: #fff;
      border-radius: 10px;
      box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
      overflow: hidden;
      text-align: center;
      transition: transform 0.3s ease, box-shadow 0.3s ease;
      box-sizing: border-box;
    }

    .page-0k9__product-card:hover {
      transform: translateY(-10px);
      box-shadow: 0 8px 20px rgba(0, 0, 0, 0.15);
    }

    .page-0k9__product-image {
      width: 100%;
      height: 200px;
      object-fit: cover;
      display: block;
    }

    .page-0k9__product-content {
      padding: 20px;
    }

    .page-0k9__product-content h3 {
      font-size: 1.5em;
      color: #0056b3;
      margin-bottom: 10px;
    }

    .page-0k9__product-content p {
      font-size: 1em;
      color: #555;
      margin-bottom: 15px;
    }

    .page-0k9__product-button {
      display: inline-block;
      background-color: #ffc107;
      color: #333;
      padding: 10px 20px;
      border-radius: 25px;
      text-decoration: none;
      font-weight: bold;
      font-size: 0.9em;
      transition: background-color 0.3s ease;
      border: none;
      cursor: pointer;
    }

    .page-0k9__product-button:hover {
      background-color: #e0a800;
    }

    /* Khuyến Mãi Section */
    .page-0k9__promotions-section {
      padding: 60px 0;
      background-color: #fff;
    }

    .page-0k9__promotion-card {
      display: flex;
      background-color: #f9f9f9;
      border-radius: 10px;
      box-shadow: 0 4px 12px rgba(0, 0, 0, 0.08);
      margin-bottom: 30px;
      overflow: hidden;
      align-items: center;
      flex-wrap: wrap;
      box-sizing: border-box;
    }

    .page-0k9__promotion-image {
      width: 40%;
      height: 250px;
      object-fit: cover;
      display: block;
    }

    .page-0k9__promotion-content {
      width: 60%;
      padding: 30px;
      box-sizing: border-box;
    }

    .page-0k9__promotion-content h3 {
      font-size: 1.8em;
      color: #0056b3;
      margin-bottom: 15px;
    }

    .page-0k9__promotion-content p {
      font-size: 1.1em;
      color: #555;
      margin-bottom: 20px;
    }

    .page-0k9__promotion-button {
      display: inline-block;
      background-color: #28a745;
      color: #fff;
      padding: 12px 25px;
      border-radius: 30px;
      text-decoration: none;
      font-weight: bold;
      transition: background-color 0.3s ease;
      border: none;
      cursor: pointer;
    }

    .page-0k9__promotion-button:hover {
      background-color: #218838;
    }

    /* Tại Sao Chọn 0k9 Section */
    .page-0k9__why-choose-section {
      padding: 60px 0;
      background-color: #e6f2ff;
    }

    .page-0k9__feature-grid {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
      gap: 30px;
    }

    .page-0k9__feature-card {
      background-color: #fff;
      border-radius: 10px;
      padding: 30px;
      box-shadow: 0 4px 12px rgba(0, 0, 0, 0.08);
      text-align: center;
      box-sizing: border-box;
    }

    .page-0k9__feature-icon {
      max-width: 80px; /* Adjust size for content images, not icons */
      height: auto;
      margin-bottom: 20px;
      display: block;
      margin-left: auto;
      margin-right: auto;
    }

    .page-0k9__feature-card h3 {
      font-size: 1.4em;
      color: #0056b3;
      margin-bottom: 10px;
    }

    .page-0k9__feature-card p {
      font-size: 1em;
      color: #555;
    }

    /* FAQ Section */
    .page-0k9__faq-section {
      padding: 60px 0;
      background-color: #f8f8f8;
    }

    .page-0k9__faq-list {
      max-width: 800px;
      margin: 0 auto;
    }

    .page-0k9__faq-item {
      background-color: #fff;
      border-radius: 8px;
      margin-bottom: 15px;
      box-shadow: 0 2px 8px rgba(0, 0, 0, 0.05);
      overflow: hidden;
      box-sizing: border-box;
    }

    .page-0k9__faq-question {
      display: flex;
      justify-content: space-between;
      align-items: center;
      padding: 20px 25px;
      cursor: pointer;
      background-color: #007bff;
      color: #fff;
      font-size: 1.1em;
      font-weight: bold;
      border-bottom: 1px solid rgba(255, 255, 255, 0.2);
      transition: background-color 0.3s ease;
      user-select: none;
    }

    .page-0k9__faq-question h3 {
      margin: 0;
      font-size: 1.1em; /* Ensure h3 inside is not too large */
      color: #fff;
      pointer-events: none; /* Prevent h3 from blocking click event */
    }

    .page-0k9__faq-question:hover {
      background-color: #0056b3;
    }

    .page-0k9__faq-toggle {
      font-size: 1.5em;
      line-height: 1;
      transition: transform 0.3s ease;
      pointer-events: none; /* Prevent toggle from blocking click event */
    }

    .page-0k9__faq-item.active .page-0k9__faq-toggle {
      transform: rotate(45deg); /* Plus to X */
    }

    .page-0k9__faq-answer {
      max-height: 0;
      overflow: hidden;
      padding: 0 25px; /* 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;
      background-color: #fefefe;
      color: #333;
    }

    .page-0k9__faq-item.active .page-0k9__faq-answer {
      max-height: 2000px !important; /* Sufficiently large value */
      padding: 20px 25px !important; /* Active padding */
      opacity: 1;
    }

    .page-0k9__faq-answer p {
      margin: 0;
      padding-bottom: 10px;
    }

    /* Responsive Design */
    @media (max-width: 992px) {
      .page-0k9__hero-title {
        font-size: 3em;
      }

      .page-0k9__hero-description {
        font-size: 1.1em;
      }

      .page-0k9__about-content {
        flex-direction: column;
        text-align: center;
      }

      .page-0k9__promotion-card {
        flex-direction: column;
      }

      .page-0k9__promotion-image {
        width: 100%;
        height: 220px;
      }

      .page-0k9__promotion-content {
        width: 100%;
        padding: 25px;
      }
    }

    @media (max-width: 768px) {
      .page-0k9__section-title {
        font-size: 2em;
        margin-bottom: 30px;
      }

      .page-0k9__hero-section {
        padding: 80px 0 60px;
      }

      .page-0k9__hero-title {
        font-size: 2.5em;
      }

      .page-0k9__hero-description {
        font-size: 1em;
      }

      .page-0k9__hero-button {
        padding: 12px 25px;
        font-size: 1.1em;
      }

      .page-0k9__floating-buttons {
        bottom: 15px;
        right: 15px;
      }

      .page-0k9__floating-button {
        padding: 10px 20px;
        font-size: 1em;
      }

      .page-0k9__about-text h2 {
        font-size: 1.8em;
      }

      .page-0k9__about-text p {
        font-size: 1em;
      }

      .page-0k9__product-grid,
      .page-0k9__feature-grid {
        grid-template-columns: 1fr; /* Single column for mobile */
      }

      /* List item mobile responsiveness */
      .page-0k9__product-card,
      .page-0k9__feature-card,
      .page-0k9__faq-item {
        width: 100% !important;
        max-width: 100% !important;
        box-sizing: border-box !important;
        margin-left: 0 !important;
        margin-right: 0 !important;
      }
      .page-0k9__product-grid,
      .page-0k9__feature-grid,
      .page-0k9__faq-list {
        width: 100% !important;
        max-width: 100% !important;
        box-sizing: border-box !important;
        padding: 0 15px !important; /* Adjust padding for container */
        margin-left: 0 !important;
        margin-right: 0 !important;
      }
      .page-0k9__product-content p,
      .page-0k9__feature-card p,
      .page-0k9__promotion-content p,
      .page-0k9__faq-answer p {
        word-wrap: break-word !important;
        overflow-wrap: break-word !important;
        word-break: break-word !important;
      }

      .page-0k9__promotion-content h3 {
        font-size: 1.5em;
      }

      .page-0k9__promotion-content p {
        font-size: 1em;
      }

      .page-0k9__faq-question {
        padding: 15px 20px;
        font-size: 1em;
      }
      .page-0k9__faq-question h3 {
        font-size: 1em;
      }
      .page-0k9__faq-answer {
        padding: 0 20px;
      }
      .page-0k9__faq-item.active .page-0k9__faq-answer {
        padding: 15px 20px !important;
      }
    }

    @media (max-width: 480px) {
      .page-0k9__hero-title {
        font-size: 2em;
      }

      .page-0k9__hero-description {
        font-size: 0.9em;
      }
    }