/* Tổng quan */
    .page-21hello {
      font-family: 'Arial', sans-serif;
      color: #333;
      line-height: 1.6;
      background-color: #f5f5f5;
      padding-bottom: 80px; /* Để chừa chỗ cho nút nổi */
    }

    .page-21hello__container {
      max-width: 1200px;
      margin: 0 auto;
      padding: 0 15px;
    }

    /* Tiêu đề chính */
    .page-21hello__hero-section {
      background-color: #001f3f; /* Dark blue background */
      color: #fff;
      text-align: center;
      padding: 60px 15px 40px; /* Added small padding-top for decorative spacing */
      position: relative;
      overflow: hidden;
      border-bottom: 5px solid #ffcc00; /* Gold accent */
    }

    .page-21hello__hero-title {
      font-size: 2.5em;
      margin-bottom: 15px;
      color: #ffcc00; /* Gold color for main title */
      text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.5);
    }

    .page-21hello__hero-subtitle {
      font-size: 1.2em;
      margin-bottom: 30px;
      max-width: 800px;
      margin-left: auto;
      margin-right: auto;
    }

    .page-21hello__cta-button {
      display: inline-block;
      background-color: #ff4500; /* Orange-red for CTA */
      color: #fff;
      padding: 15px 30px;
      border-radius: 5px;
      font-weight: bold;
      text-decoration: none;
      transition: background-color 0.3s ease;
      border: none;
      cursor: pointer;
      font-size: 1em;
    }

    .page-21hello__cta-button:hover {
      background-color: #e03a00;
    }

    /* Nút đăng ký/đăng nhập nổi */
    .page-21hello__floating-buttons {
      position: fixed;
      bottom: 20px;
      left: 50%;
      transform: translateX(-50%);
      display: flex;
      gap: 15px;
      z-index: 1000;
      width: 90%;
      max-width: 380px;
    }

    .page-21hello__floating-button {
      flex: 1;
      padding: 12px 10px;
      border-radius: 50px;
      font-weight: bold;
      text-align: center;
      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, 0.2);
    }

    .page-21hello__floating-button--register {
      background-color: #ffcc00; /* Gold for register */
      color: #001f3f;
    }

    .page-21hello__floating-button--register:hover {
      background-color: #e6b800;
      transform: translateY(-2px);
    }

    .page-21hello__floating-button--login {
      background-color: #007bff; /* Blue for login */
      color: #fff;
    }

    .page-21hello__floating-button--login:hover {
      background-color: #0056b3;
      transform: translateY(-2px);
    }

    /* Phần giới thiệu sản phẩm/trò chơi */
    .page-21hello__section {
      padding: 40px 0;
      background-color: #fff;
      margin-top: 20px;
      border-radius: 8px;
      box-shadow: 0 2px 5px rgba(0, 0, 0, 0.1);
    }

    .page-21hello__section--dark {
      background-color: #001f3f;
      color: #fff;
    }

    .page-21hello__section-title {
      text-align: center;
      font-size: 2em;
      margin-bottom: 30px;
      color: #001f3f;
      position: relative;
    }

    .page-21hello__section--dark .page-21hello__section-title {
      color: #ffcc00;
    }

    .page-21hello__section-title::after {
      content: '';
      display: block;
      width: 60px;
      height: 3px;
      background-color: #ffcc00;
      margin: 10px auto 0;
    }

    .page-21hello__section--dark .page-21hello__section-title::after {
      background-color: #ff4500;
    }

    .page-21hello__game-grid {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
      gap: 20px;
      justify-items: center; /* Center items in the grid */
    }

    .page-21hello__game-card {
      background-color: #f9f9f9;
      border-radius: 8px;
      overflow: hidden;
      box-shadow: 0 4px 10px rgba(0, 0, 0, 0.1);
      transition: transform 0.3s ease, box-shadow 0.3s ease;
      text-align: center;
      width: 100%;
      max-width: 350px; /* Ensure cards don't get too wide on desktop */
      box-sizing: border-box; /* Crucial for responsive lists */
    }

    .page-21hello__game-card:hover {
      transform: translateY(-5px);
      box-shadow: 0 6px 15px rgba(0, 0, 0, 0.15);
    }

    .page-21hello__game-image-wrapper {
      width: 100%;
      height: 200px; /* Fixed height for image consistency */
      overflow: hidden;
      display: flex;
      justify-content: center;
      align-items: center;
      background-color: #eee;
    }

    .page-21hello__game-image {
      max-width: 100%;
      height: auto;
      display: block;
      object-fit: cover; /* Ensure image covers the area without distortion */
      width: 100%; /* Important for responsive images */
      box-sizing: border-box; /* For consistency */
    }

    .page-21hello__game-content {
      padding: 20px;
    }

    .page-21hello__game-title {
      font-size: 1.3em;
      margin-bottom: 10px;
      color: #001f3f;
    }

    .page-21hello__game-description {
      font-size: 0.9em;
      color: #555;
      margin-bottom: 15px;
    }

    .page-21hello__game-button {
      background-color: #ffcc00;
      color: #001f3f;
      padding: 10px 20px;
      border-radius: 5px;
      font-weight: bold;
      transition: background-color 0.3s ease;
      border: none;
      cursor: pointer;
      font-size: 0.9em;
    }

    .page-21hello__game-button:hover {
      background-color: #e6b800;
    }

    /* Phần khuyến mãi */
    .page-21hello__promotion-list {
      display: flex;
      flex-direction: column;
      gap: 15px;
    }

    .page-21hello__promotion-item {
      display: flex;
      align-items: center;
      background-color: #fff;
      padding: 20px;
      border-radius: 8px;
      box-shadow: 0 2px 5px rgba(0, 0, 0, 0.1);
      box-sizing: border-box; /* Crucial for responsive lists */
    }

    .page-21hello__promotion-image-wrapper {
      flex-shrink: 0;
      width: 150px;
      height: 100px;
      margin-right: 20px;
      overflow: hidden;
      border-radius: 5px;
      background-color: #eee;
      display: flex;
      justify-content: center;
      align-items: center;
    }

    .page-21hello__promotion-image {
      max-width: 100%;
      height: auto;
      display: block;
      object-fit: cover;
      width: 100%;
      box-sizing: border-box;
    }

    .page-21hello__promotion-content {
      flex-grow: 1;
    }

    .page-21hello__promotion-title {
      font-size: 1.2em;
      color: #001f3f;
      margin-bottom: 5px;
    }

    .page-21hello__promotion-description {
      font-size: 0.9em;
      color: #555;
    }

    /* Phần tại sao chọn chúng tôi */
    .page-21hello__feature-grid {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
      gap: 20px;
    }

    .page-21hello__feature-card {
      text-align: center;
      padding: 30px 20px;
      background-color: #f9f9f9;
      border-radius: 8px;
      box-shadow: 0 2px 5px rgba(0, 0, 0, 0.05);
      box-sizing: border-box; /* Crucial for responsive lists */
    }

    .page-21hello__feature-icon-wrapper {
      margin-bottom: 15px;
      width: 100%;
      height: 100px; /* Ensure minimum size */
      display: flex;
      justify-content: center;
      align-items: center;
      background-color: #eee;
    }

    .page-21hello__feature-icon {
      width: 100px; /* Example size, min 200x200 for actual images, this is a placeholder */
      height: 100px;
      object-fit: contain;
      max-width: 100%;
      box-sizing: border-box;
    }

    .page-21hello__feature-title {
      font-size: 1.2em;
      color: #001f3f;
      margin-bottom: 10px;
    }

    .page-21hello__feature-description {
      font-size: 0.9em;
      color: #555;
    }

    /* FAQ Section */
    .page-21hello__faq-section {
      padding: 40px 0;
      background-color: #f0f8ff; /* Light blue background for FAQ */
      margin-top: 20px;
      border-radius: 8px;
      box-shadow: 0 2px 5px rgba(0, 0, 0, 0.1);
    }

    .page-21hello__faq-list {
      list-style: none;
      padding: 0;
      margin: 0;
    }

    .page-21hello__faq-item {
      background-color: #fff;
      border: 1px solid #ddd;
      margin-bottom: 10px;
      border-radius: 5px;
      overflow: hidden;
      box-sizing: border-box; /* Crucial for responsive lists */
    }

    .page-21hello__faq-question {
      display: flex;
      justify-content: space-between;
      align-items: center;
      padding: 15px;
      font-size: 1.1em;
      font-weight: bold;
      color: #001f3f;
      cursor: pointer;
      background-color: #e6f2ff; /* Lighter blue for question background */
      transition: background-color 0.3s ease;
      user-select: none;
    }

    .page-21hello__faq-question:hover {
      background-color: #d9edf7;
    }

    .page-21hello__faq-question h3 {
      margin: 0;
      flex-grow: 1;
      pointer-events: none; /* Prevent h3 from blocking click on parent div */
      color: #001f3f; /* Ensure good contrast */
    }

    .page-21hello__faq-toggle {
      font-size: 1.5em;
      margin-left: 15px;
      transition: transform 0.3s ease;
      pointer-events: none; /* Prevent toggle icon from blocking click on parent div */
      color: #001f3f; /* Ensure good contrast */
    }

    .page-21hello__faq-item.active .page-21hello__faq-toggle {
      transform: rotate(45deg); /* Change + to X or a dash visually */
    }

    .page-21hello__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: #555;
    }

    .page-21hello__faq-item.active .page-21hello__faq-answer {
      max-height: 2000px !important; /* Sufficiently large */
      padding: 20px 15px !important;
      opacity: 1;
    }

    /* Responsive Design */
    @media (max-width: 768px) {
      .page-21hello__hero-title {
        font-size: 2em;
      }

      .page-21hello__hero-subtitle {
        font-size: 1em;
      }

      .page-21hello__cta-button {
        padding: 12px 25px;
        font-size: 0.9em;
      }

      .page-21hello__floating-buttons {
        width: 95%;
        gap: 10px;
      }

      .page-21hello__floating-button {
        padding: 10px 8px;
        font-size: 0.9em;
      }

      .page-21hello__section-title {
        font-size: 1.8em;
      }

      .page-21hello__game-grid {
        grid-template-columns: 1fr; /* Single column on mobile */
      }

      .page-21hello__game-card,
      .page-21hello__promotion-item,
      .page-21hello__feature-card,
      .page-21hello__faq-item {
        width: 100% !important;
        max-width: 100% !important;
        box-sizing: border-box !important;
        margin-left: 0 !important;
        margin-right: 0 !important;
      }

      .page-21hello__game-card {
        margin: 0 auto 20px auto !important; /* Center single card */
      }

      .page-21hello__game-image,
      .page-21hello__promotion-image,
      .page-21hello__feature-icon {
        max-width: 100% !important;
        height: auto !important;
        box-sizing: border-box !important;
      }

      .page-21hello__game-image-wrapper,
      .page-21hello__promotion-image-wrapper,
      .page-21hello__feature-icon-wrapper {
        width: 100% !important;
        max-width: 100% !important;
        overflow: hidden !important;
        box-sizing: border-box !important;
        margin-right: 0 !important; /* Remove margin for promotion image wrapper */
      }

      .page-21hello__promotion-item {
        flex-direction: column;
        text-align: center;
      }

      .page-21hello__promotion-image-wrapper {
        margin-bottom: 15px;
        width: 100%;
        height: 150px; /* Adjust height for mobile */
      }

      .page-21hello__faq-question {
        padding: 12px;
        font-size: 1em;
      }

      .page-21hello__faq-answer {
        padding: 15px 12px !important;
      }

      /* Ensure all text wraps */
      .page-21hello__game-description,
      .page-21hello__promotion-description,
      .page-21hello__feature-description,
      .page-21hello__faq-answer p {
        word-wrap: break-word !important;
        overflow-wrap: break-word !important;
        word-break: break-word !important;
      }
    }

    @media (max-width: 480px) {
      .page-21hello__hero-title {
        font-size: 1.8em;
      }
      .page-21hello__section-title {
        font-size: 1.6em;
      }
    }