:root {
      --page-winvnapp-primary-color: #007bff; /* Xanh dương */
      --page-winvnapp-secondary-color: #6c757d; /* Xám */
      --page-winvnapp-accent-color: #ffc107; /* Vàng */
      --page-winvnapp-text-color: #333;
      --page-winvnapp-light-bg: #f8f9fa;
      --page-winvnapp-dark-bg: #343a40;
      --page-winvnapp-white: #fff;
    }

    .page-winvnapp {
      font-family: 'Arial', sans-serif;
      line-height: 1.6;
      color: var(--page-winvnapp-text-color);
      background-color: var(--page-winvnapp-light-bg);
      padding: 0;
      margin: 0;
    }

    .page-winvnapp__section {
      padding: 40px 20px;
      margin-bottom: 20px;
      background-color: var(--page-winvnapp-white);
      border-radius: 8px;
      box-shadow: 0 2px 4px rgba(0, 0, 0, 0.05);
      max-width: 1200px;
      margin-left: auto;
      margin-right: auto;
      box-sizing: border-box;
    }

    .page-winvnapp__section--dark {
      background-color: var(--page-winvnapp-dark-bg);
      color: var(--page-winvnapp-white);
    }

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

    .page-winvnapp__hero-section {
      position: relative;
      text-align: center;
      color: var(--page-winvnapp-white);
      padding: 10px 0 60px 0; /* Adjusted padding-top for fixed header */
      background: linear-gradient(135deg, var(--page-winvnapp-primary-color), #0056b3);
      overflow: hidden;
      margin-bottom: 20px;
      border-radius: 0 0 8px 8px;
    }

    .page-winvnapp__hero-image {
      width: 100%;
      height: 400px; /* Fixed height for banner */
      object-fit: cover;
      display: block;
      margin-bottom: 20px;
      border-radius: 8px;
      max-width: 100%;
      box-sizing: border-box;
    }

    .page-winvnapp__hero-content {
      position: relative;
      z-index: 2;
      padding: 0 20px;
      max-width: 900px;
      margin: 0 auto;
    }

    .page-winvnapp__hero-title {
      font-size: 2.8em;
      margin-bottom: 15px;
      font-weight: bold;
      color: var(--page-winvnapp-white);
    }

    .page-winvnapp__hero-subtitle {
      font-size: 1.3em;
      margin-bottom: 30px;
      color: rgba(255, 255, 255, 0.9);
    }

    .page-winvnapp__button {
      display: inline-block;
      background-color: var(--page-winvnapp-accent-color);
      color: var(--page-winvnapp-dark-bg);
      padding: 12px 25px;
      border-radius: 50px;
      text-decoration: none;
      font-weight: bold;
      font-size: 1.1em;
      transition: background-color 0.3s ease, transform 0.3s ease;
      border: none;
      cursor: pointer;
    }

    .page-winvnapp__button:hover {
      background-color: #e0a800;
      transform: translateY(-2px);
    }

    .page-winvnapp__floating-button {
      position: fixed;
      bottom: 20px;
      right: 20px;
      z-index: 1000;
      background-color: #dc3545; /* Đỏ nổi bật */
      color: var(--page-winvnapp-white);
      padding: 15px 25px;
      border-radius: 50px;
      text-decoration: none;
      font-weight: bold;
      font-size: 1.2em;
      box-shadow: 0 4px 8px rgba(0, 0, 0, 0.2);
      animation: page-winvnapp__pulse 2s infinite;
      border: none;
      cursor: pointer;
    }

    .page-winvnapp__floating-button:hover {
      background-color: #c82333;
      animation: none;
    }

    @keyframes page-winvnapp__pulse {
      0% {
        transform: scale(1);
        box-shadow: 0 0 0 0 rgba(220, 53, 69, 0.7);
      }
      70% {
        transform: scale(1.05);
        box-shadow: 0 0 0 10px rgba(220, 53, 69, 0);
      }
      100% {
        transform: scale(1);
        box-shadow: 0 0 0 0 rgba(220, 53, 69, 0);
      }
    }

    .page-winvnapp__title {
      font-size: 2.2em;
      color: var(--page-winvnapp-primary-color);
      text-align: center;
      margin-bottom: 30px;
      font-weight: bold;
    }

    .page-winvnapp__subtitle {
      font-size: 1.8em;
      color: var(--page-winvnapp-dark-bg);
      margin-top: 25px;
      margin-bottom: 15px;
      font-weight: bold;
    }

    .page-winvnapp__text {
      font-size: 1.1em;
      margin-bottom: 15px;
      color: #555;
    }

    .page-winvnapp__steps-list {
      list-style: none;
      padding: 0;
      display: flex;
      flex-wrap: wrap;
      justify-content: center;
      gap: 25px;
    }

    .page-winvnapp__step-item {
      background-color: var(--page-winvnapp-light-bg);
      border: 1px solid #eee;
      border-radius: 8px;
      padding: 25px;
      flex: 1 1 calc(33% - 25px);
      min-width: 280px;
      text-align: center;
      box-shadow: 0 1px 3px rgba(0, 0, 0, 0.08);
      box-sizing: border-box; /* Crucial for responsive lists */
    }

    .page-winvnapp__step-number {
      background-color: var(--page-winvnapp-primary-color);
      color: var(--page-winvnapp-white);
      border-radius: 50%;
      width: 50px;
      height: 50px;
      display: flex;
      justify-content: center;
      align-items: center;
      font-size: 1.8em;
      font-weight: bold;
      margin: 0 auto 15px auto;
    }

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

    .page-winvnapp__step-description {
      font-size: 1em;
      color: #666;
    }

    .page-winvnapp__feature-grid {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
      gap: 25px;
      margin-top: 30px;
    }

    .page-winvnapp__feature-item {
      background-color: var(--page-winvnapp-white);
      border: 1px solid #eee;
      border-radius: 8px;
      padding: 25px;
      text-align: center;
      box-shadow: 0 1px 3px rgba(0, 0, 0, 0.08);
      box-sizing: border-box;
    }

    .page-winvnapp__feature-icon {
      width: 80px;
      height: 80px;
      margin-bottom: 15px;
      object-fit: contain;
      max-width: 100%;
      height: auto;
    }

    .page-winvnapp__feature-title {
      font-size: 1.2em;
      color: var(--page-winvnapp-primary-color);
      margin-bottom: 10px;
    }

    .page-winvnapp__feature-description {
      font-size: 0.95em;
      color: #666;
    }

    .page-winvnapp__game-grid {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
      gap: 20px;
      margin-top: 30px;
    }

    .page-winvnapp__game-card {
      background-color: var(--page-winvnapp-light-bg);
      border-radius: 8px;
      overflow: hidden;
      box-shadow: 0 2px 5px rgba(0, 0, 0, 0.1);
      text-align: center;
      transition: transform 0.2s ease;
      box-sizing: border-box;
    }

    .page-winvnapp__game-card:hover {
      transform: translateY(-5px);
    }

    .page-winvnapp__game-image {
      width: 100%;
      height: 150px;
      object-fit: cover;
      display: block;
      max-width: 100%;
      box-sizing: border-box;
    }

    .page-winvnapp__game-title {
      font-size: 1.1em;
      color: var(--page-winvnapp-dark-bg);
      padding: 15px 10px;
      font-weight: bold;
    }

    .page-winvnapp__cta-section {
      text-align: center;
      padding: 50px 20px;
      background-color: var(--page-winvnapp-primary-color);
      color: var(--page-winvnapp-white);
      border-radius: 8px;
      margin-top: 40px;
      box-shadow: 0 4px 8px rgba(0, 0, 0, 0.1);
    }

    .page-winvnapp__cta-title {
      font-size: 2.5em;
      margin-bottom: 20px;
      font-weight: bold;
    }

    .page-winvnapp__cta-description {
      font-size: 1.2em;
      margin-bottom: 30px;
    }

    .page-winvnapp__faq-section {
      background-color: var(--page-winvnapp-white);
      padding: 40px 20px;
      border-radius: 8px;
      box-shadow: 0 2px 4px rgba(0, 0, 0, 0.05);
      max-width: 1200px;
      margin-left: auto;
      margin-right: auto;
      box-sizing: border-box;
    }

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

    .page-winvnapp__faq-item {
      border-bottom: 1px solid #eee;
      margin-bottom: 10px;
      padding-bottom: 10px;
    }

    .page-winvnapp__faq-item:last-child {
      border-bottom: none;
      margin-bottom: 0;
      padding-bottom: 0;
    }

    .page-winvnapp__faq-question {
      display: flex;
      justify-content: space-between;
      align-items: center;
      cursor: pointer;
      padding: 15px 0;
      font-size: 1.2em;
      color: var(--page-winvnapp-dark-bg);
      font-weight: bold;
      user-select: none;
      transition: color 0.3s ease;
    }

    .page-winvnapp__faq-question:hover {
      color: var(--page-winvnapp-primary-color);
    }

    .page-winvnapp__faq-question h3 {
      margin: 0;
      font-size: 1.2em;
      pointer-events: none; /* Prevents text from blocking click event */
      color: inherit; /* Inherit color from parent for hover effect */
    }

    .page-winvnapp__faq-toggle {
      font-size: 1.5em;
      font-weight: bold;
      color: var(--page-winvnapp-primary-color);
      margin-left: 15px;
      transition: transform 0.3s ease;
      pointer-events: none; /* Prevents icon from blocking click event */
    }

    .page-winvnapp__faq-item.active .page-winvnapp__faq-toggle {
      transform: rotate(45deg); /* Change '+' to 'x' or '-' */
    }

    .page-winvnapp__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;
      font-size: 1em;
      color: #555;
      line-height: 1.7;
    }

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

    /* Responsive Design */
    @media (max-width: 992px) {
      .page-winvnapp__hero-title {
        font-size: 2.2em;
      }
      .page-winvnapp__hero-subtitle {
        font-size: 1.1em;
      }
      .page-winvnapp__title {
        font-size: 2em;
      }
      .page-winvnapp__subtitle {
        font-size: 1.6em;
      }
      .page-winvnapp__step-item {
        flex: 1 1 calc(50% - 25px);
      }
      .page-winvnapp__game-grid {
        grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
      }
    }

    @media (max-width: 768px) {
      .page-winvnapp__hero-section {
        padding-top: 10px; /* Adjusted padding-top for mobile fixed header */
      }
      .page-winvnapp__hero-image {
        height: 250px;
      }
      .page-winvnapp__hero-title {
        font-size: 1.8em;
      }
      .page-winvnapp__hero-subtitle {
        font-size: 1em;
      }
      .page-winvnapp__button {
        padding: 10px 20px;
        font-size: 1em;
      }
      .page-winvnapp__floating-button {
        bottom: 15px;
        right: 15px;
        padding: 12px 20px;
        font-size: 1em;
      }
      .page-winvnapp__section {
        padding: 30px 15px;
      }
      .page-winvnapp__title {
        font-size: 1.8em;
      }
      .page-winvnapp__subtitle {
        font-size: 1.4em;
      }
      .page-winvnapp__text {
        font-size: 0.95em;
      }
      .page-winvnapp__steps-list,
      .page-winvnapp__feature-grid,
      .page-winvnapp__game-grid {
        gap: 15px;
      }
      .page-winvnapp__step-item,
      .page-winvnapp__feature-item,
      .page-winvnapp__game-card {
        width: 100% !important;
        max-width: 100% !important;
        flex: 1 1 100% !important;
        margin-left: 0 !important;
        margin-right: 0 !important;
        box-sizing: border-box !important;
        padding-left: 15px !important; /* Adjust padding to prevent content overflow */
        padding-right: 15px !important;
      }
      .page-winvnapp__game-image {
        height: 120px;
      }
      .page-winvnapp__cta-title {
        font-size: 2em;
      }
      .page-winvnapp__cta-description {
        font-size: 1em;
      }
      .page-winvnapp__faq-question {
        font-size: 1.1em;
        padding: 12px 0;
      }
      .page-winvnapp__faq-question h3 {
        font-size: 1.1em;
      }
      .page-winvnapp__faq-answer {
        padding: 15px 15px !important;
        font-size: 0.95em;
        word-wrap: break-word !important; /* Ensure text breaks */
        overflow-wrap: break-word !important; /* Ensure text breaks */
      }
    }

    @media (max-width: 480px) {
      .page-winvnapp__hero-title {
        font-size: 1.5em;
      }
      .page-winvnapp__hero-subtitle {
        font-size: 0.9em;
      }
      .page-winvnapp__floating-button {
        font-size: 0.9em;
        padding: 10px 15px;
      }
      .page-winvnapp__title {
        font-size: 1.5em;
      }
      .page-winvnapp__subtitle {
        font-size: 1.2em;
      }
      .page-winvnapp__step-item,
      .page-winvnapp__feature-item,
      .page-winvnapp__game-card {
        padding-left: 10px !important;
        padding-right: 10px !important;
      }
      .page-winvnapp__faq-question h3 {
        font-size: 1em;
      }
    }