:root {
      --page-ue9-primary-color: #e44d26; /* Màu cam đậm */
      --page-ue9-secondary-color: #f7a01a; /* Màu cam nhạt */
      --page-ue9-text-color: #333;
      --page-ue9-light-text-color: #f0f0f0;
      --page-ue9-background-light: #f9f9f9;
      --page-ue9-background-dark: #2c3e50; /* Xám xanh đậm */
      --page-ue9-border-radius: 8px;
      --page-ue9-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
    }

    .page-ue9 {
      font-family: 'Arial', sans-serif;
      line-height: 1.6;
      color: var(--page-ue9-text-color);
      background-color: var(--page-ue9-background-light);
      padding-bottom: 80px; /* Để chừa chỗ cho nút nổi */
    }

    .page-ue9__container {
      max-width: 1200px;
      margin: 0 auto;
      padding: 20px;
    }

    .page-ue9__hero-section {
      position: relative;
      width: 100%;
      overflow: hidden;
      text-align: center;
      color: var(--page-ue9-light-text-color);
      padding-top: 10px; /* Essential for fixed header */
      background-color: var(--page-ue9-background-dark);
    }

    .page-ue9__hero-image {
      width: 100%;
      height: auto;
      display: block;
      max-width: 100%;
      object-fit: cover;
      margin: 0 auto;
      filter: brightness(0.7); /* Slightly dim the image for text readability */
    }

    .page-ue9__hero-content {
      position: absolute;
      top: 50%;
      left: 50%;
      transform: translate(-50%, -50%);
      z-index: 1;
      padding: 20px;
      max-width: 90%;
      box-sizing: border-box;
      background-color: rgba(0, 0, 0, 0.5);
      border-radius: var(--page-ue9-border-radius);
    }

    .page-ue9__hero-title {
      font-size: 2.8em;
      margin-bottom: 15px;
      color: #fff;
      text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.7);
    }

    .page-ue9__hero-description {
      font-size: 1.2em;
      margin-bottom: 25px;
      color: #eee;
    }

    .page-ue9__button {
      display: inline-block;
      background-color: var(--page-ue9-primary-color);
      color: #fff;
      padding: 12px 25px;
      border-radius: var(--page-ue9-border-radius);
      text-decoration: none;
      font-weight: bold;
      transition: background-color 0.3s ease, transform 0.2s ease;
      border: none;
      cursor: pointer;
      font-size: 1em;
    }

    .page-ue9__button:hover {
      background-color: var(--page-ue9-secondary-color);
      transform: translateY(-2px);
    }

    .page-ue9__floating-button {
      position: fixed;
      bottom: 20px;
      right: 20px;
      background-color: var(--page-ue9-primary-color);
      color: #fff;
      padding: 15px 25px;
      border-radius: 50px;
      text-align: center;
      font-weight: bold;
      box-shadow: var(--page-ue9-shadow);
      z-index: 1000;
      animation: page-ue9__pulse 2s infinite;
      text-decoration: none;
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 1.1em;
      border: none;
      cursor: pointer;
    }

    .page-ue9__floating-button:hover {
      background-color: var(--page-ue9-secondary-color);
    }

    @keyframes page-ue9__pulse {
      0% { transform: scale(1); }
      50% { transform: scale(1.05); }
      100% { transform: scale(1); }
    }

    .page-ue9__section {
      padding: 40px 0;
      background-color: #fff;
      margin-bottom: 20px;
      border-radius: var(--page-ue9-border-radius);
      box-shadow: var(--page-ue9-shadow);
    }

    .page-ue9__section--dark {
      background-color: var(--page-ue9-background-dark);
      color: var(--page-ue9-light-text-color);
    }

    .page-ue9__section-title {
      font-size: 2.2em;
      text-align: center;
      margin-bottom: 30px;
      color: var(--page-ue9-primary-color);
    }

    .page-ue9__section--dark .page-ue9__section-title {
      color: var(--page-ue9-secondary-color);
    }

    .page-ue9__game-grid {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
      gap: 25px;
      padding: 0 20px;
    }

    .page-ue9__game-item {
      background-color: var(--page-ue9-background-light);
      border-radius: var(--page-ue9-border-radius);
      overflow: hidden;
      box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
      text-align: center;
      transition: transform 0.3s ease;
    }

    .page-ue9__game-item:hover {
      transform: translateY(-5px);
    }

    .page-ue9__game-image-wrapper {
      width: 100%;
      max-width: 100%;
      overflow: hidden;
      box-sizing: border-box;
    }

    .page-ue9__game-image {
      width: 100%;
      height: 200px;
      object-fit: cover;
      display: block;
    }

    .page-ue9__game-content {
      padding: 20px;
    }

    .page-ue9__game-title {
      font-size: 1.5em;
      margin-bottom: 10px;
      color: var(--page-ue9-primary-color);
    }

    .page-ue9__game-description {
      font-size: 0.95em;
      color: var(--page-ue9-text-color);
    }

    .page-ue9__advantage-list {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
      gap: 20px;
      list-style: none;
      padding: 0 20px;
      margin: 0;
    }

    .page-ue9__advantage-item {
      background-color: #fff;
      padding: 25px;
      border-radius: var(--page-ue9-border-radius);
      box-shadow: var(--page-ue9-shadow);
      text-align: center;
    }

    .page-ue9__advantage-item h3 {
      font-size: 1.4em;
      color: var(--page-ue9-primary-color);
      margin-bottom: 10px;
    }

    .page-ue9__advantage-item p {
      font-size: 0.95em;
      color: var(--page-ue9-text-color);
    }

    .page-ue9__how-to-play-section .page-ue9__container {
      text-align: center;
    }

    .page-ue9__step-list {
      display: flex;
      flex-wrap: wrap;
      justify-content: center;
      gap: 30px;
      padding: 0;
      list-style: none;
      margin-top: 30px;
    }

    .page-ue9__step-item {
      background-color: #fff;
      padding: 30px;
      border-radius: var(--page-ue9-border-radius);
      box-shadow: var(--page-ue9-shadow);
      flex: 1 1 calc(33% - 40px);
      min-width: 280px;
      max-width: 350px;
      text-align: left;
      position: relative;
      transition: transform 0.3s ease;
    }

    .page-ue9__step-item:hover {
      transform: translateY(-5px);
    }

    .page-ue9__step-number {
      position: absolute;
      top: -15px;
      left: -15px;
      background-color: var(--page-ue9-primary-color);
      color: #fff;
      border-radius: 50%;
      width: 40px;
      height: 40px;
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 1.5em;
      font-weight: bold;
      box-shadow: 0 2px 6px rgba(0, 0, 0, 0.2);
    }

    .page-ue9__step-item h3 {
      font-size: 1.5em;
      color: var(--page-ue9-primary-color);
      margin-bottom: 10px;
      padding-top: 10px;
    }

    .page-ue9__step-item p {
      font-size: 1em;
      color: var(--page-ue9-text-color);
    }

    .page-ue9__faq-section {
      background-color: var(--page-ue9-background-light);
      padding: 40px 0;
    }

    .page-ue9__faq-list {
      max-width: 800px;
      margin: 0 auto;
      padding: 0 20px;
    }

    .page-ue9__faq-item {
      background-color: #fff;
      margin-bottom: 15px;
      border-radius: var(--page-ue9-border-radius);
      box-shadow: var(--page-ue9-shadow);
      overflow: hidden;
    }

    .page-ue9__faq-question {
      display: flex;
      justify-content: space-between;
      align-items: center;
      padding: 20px 25px;
      cursor: pointer;
      background-color: #f0f0f0;
      border-bottom: 1px solid #eee;
      transition: background-color 0.3s ease;
      user-select: none;
    }

    .page-ue9__faq-question:hover {
      background-color: #e0e0e0;
    }

    .page-ue9__faq-question h3 {
      font-size: 1.15em;
      color: var(--page-ue9-text-color);
      margin: 0;
      pointer-events: none; /* Prevent h3 from blocking click */
    }

    .page-ue9__faq-toggle {
      font-size: 1.5em;
      font-weight: bold;
      color: var(--page-ue9-primary-color);
      transition: transform 0.3s ease;
      pointer-events: none; /* Prevent toggle icon from blocking click */
    }

    .page-ue9__faq-item.active .page-ue9__faq-toggle {
      transform: rotate(45deg); /* Change + to X or similar, or just rotate */
    }

    .page-ue9__faq-answer {
      max-height: 0;
      overflow: hidden;
      padding: 0 25px; /* Initial padding set to 0 */
      opacity: 0;
      transition: max-height 0.4s cubic-bezier(0.4, 0, 0.2, 1), padding 0.4s ease, opacity 0.3s ease;
      color: var(--page-ue9-text-color);
      background-color: #fff;
    }

    .page-ue9__faq-item.active .page-ue9__faq-answer {
      max-height: 2000px !important; /* Sufficiently large */
      padding: 20px 25px !important; /* Expanded padding */
      opacity: 1;
    }

    .page-ue9__cta-section {
      text-align: center;
      padding: 50px 20px;
      background-color: var(--page-ue9-primary-color);
      color: var(--page-ue9-light-text-color);
      border-radius: var(--page-ue9-border-radius);
      margin-bottom: 20px;
      box-shadow: var(--page-ue9-shadow);
    }

    .page-ue9__cta-title {
      font-size: 2.5em;
      margin-bottom: 20px;
      color: #fff;
    }

    .page-ue9__cta-description {
      font-size: 1.2em;
      margin-bottom: 30px;
      color: #eee;
    }

    /* Responsive Design */
    @media (max-width: 768px) {
      .page-ue9__hero-title {
        font-size: 2em;
      }
      .page-ue9__hero-description {
        font-size: 1em;
      }
      .page-ue9__hero-content {
        width: 95%;
        padding: 15px;
      }
      .page-ue9__section-title {
        font-size: 1.8em;
      }
      .page-ue9__game-grid {
        grid-template-columns: 1fr;
      }
      .page-ue9__advantage-list {
        grid-template-columns: 1fr;
      }
      .page-ue9__step-item {
        flex: 1 1 100%;
        max-width: 100%;
      }
      .page-ue9__floating-button {
        bottom: 15px;
        right: 15px;
        padding: 12px 20px;
        font-size: 1em;
      }
      .page-ue9__hero-section {
        padding-top: 10px !important; /* Ensure padding-top is applied */
      }
      .page-ue9__game-image,
      .page-ue9__game-image-wrapper {
        max-width: 100% !important;
        height: auto !important;
        width: 100% !important;
        overflow: hidden !important;
        box-sizing: border-box !important;
      }
      .page-ue9__faq-question {
        padding: 15px 20px;
      }
      .page-ue9__faq-question h3 {
        font-size: 1em;
      }
      .page-ue9__faq-answer {
        padding: 0 20px;
      }
      .page-ue9__faq-item.active .page-ue9__faq-answer {
        padding: 15px 20px !important;
      }
      .page-ue9__cta-title {
        font-size: 2em;
      }
      .page-ue9__cta-description {
        font-size: 1em;
      }
    }

    @media (max-width: 480px) {
      .page-ue9__hero-title {
        font-size: 1.8em;
      }
      .page-ue9__hero-description {
        font-size: 0.9em;
      }
      .page-ue9__floating-button {
        font-size: 0.9em;
        padding: 10px 18px;
        bottom: 10px;
        right: 10px;
      }
    }