:root {
      --page-b66app__primary-color: #007bff; /* Xanh dương */
      --page-b66app__secondary-color: #6c757d; /* Xám */
      --page-b66app__accent-color: #ffc107; /* Vàng */
      --page-b66app__text-color: #343a40; /* Đen đậm */
      --page-b66app__light-text-color: #ffffff; /* Trắng */
      --page-b66app__background-light: #f8f9fa; /* Nền sáng */
      --page-b66app__background-dark: #212529; /* Nền tối */
      --page-b66app__border-color: #dee2e6; /* Màu viền */
      --page-b66app__shadow-color: rgba(0, 0, 0, 0.1);
    }

    .page-b66app {
      font-family: 'Arial', sans-serif;
      line-height: 1.6;
      color: var(--page-b66app__text-color);
      background-color: var(--page-b66app__background-light);
      padding-bottom: 80px; /* Space for fixed button */
    }

    .page-b66app__hero-section {
      position: relative;
      width: 100%;
      text-align: center;
      padding: 10px 0 40px 0; /* Adjusted padding-top for fixed header */
      background-color: var(--page-b66app__background-dark);
      color: var(--page-b66app__light-text-color);
      overflow: hidden;
    }

    .page-b66app__hero-image {
      width: 100%;
      max-width: 100%;
      height: auto;
      display: block;
      object-fit: cover;
      filter: brightness(0.7); /* Slightly darken image for text readability */
    }

    .page-b66app__hero-content {
      position: absolute;
      top: 50%;
      left: 50%;
      transform: translate(-50%, -50%);
      max-width: 90%;
      z-index: 2;
    }

    .page-b66app__hero-title {
      font-size: 2.5em;
      margin-bottom: 15px;
      color: var(--page-b66app__light-text-color);
      text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.5);
    }

    .page-b66app__hero-description {
      font-size: 1.1em;
      margin-bottom: 25px;
      color: var(--page-b66app__light-text-color);
      text-shadow: 1px 1px 3px rgba(0, 0, 0, 0.5);
    }

    .page-b66app__button {
      display: inline-block;
      padding: 12px 30px;
      background-color: var(--page-b66app__accent-color);
      color: var(--page-b66app__text-color);
      text-decoration: none;
      border-radius: 50px;
      font-weight: bold;
      transition: background-color 0.3s ease, transform 0.2s ease;
      border: none;
      cursor: pointer;
      font-size: 1em;
    }

    .page-b66app__button:hover {
      background-color: #e0a800;
      transform: translateY(-2px);
    }

    .page-b66app__floating-button-wrapper {
      position: fixed;
      bottom: 20px;
      left: 0;
      width: 100%;
      z-index: 1000;
      display: flex;
      justify-content: center;
      padding: 0 15px;
      box-sizing: border-box;
    }

    .page-b66app__floating-button {
      background-color: #dc3545; /* Red for urgency/promo */
      color: var(--page-b66app__light-text-color);
      padding: 15px 30px;
      border-radius: 50px;
      font-size: 1.2em;
      font-weight: bold;
      box-shadow: 0 4px 10px var(--page-b66app__shadow-color);
      animation: page-b66app__pulse 2s infinite;
      text-align: center;
      max-width: 350px;
      width: 100%;
      border: none;
      cursor: pointer;
      text-decoration: none;
    }

    .page-b66app__floating-button:hover {
      background-color: #c82333;
      animation: none;
    }

    @keyframes page-b66app__pulse {
      0% { transform: scale(1); }
      50% { transform: scale(1.05); }
      100% { transform: scale(1); }
    }

    .page-b66app__section {
      padding: 40px 20px;
      max-width: 1200px;
      margin: 0 auto;
      text-align: center;
    }

    .page-b66app__section--light {
      background-color: var(--page-b66app__background-light);
    }

    .page-b66app__section--dark {
      background-color: var(--page-b66app__background-dark);
      color: var(--page-b66app__light-text-color);
    }

    .page-b66app__heading {
      font-size: 2em;
      margin-bottom: 30px;
      color: var(--page-b66app__primary-color);
      position: relative;
      display: inline-block;
      padding-bottom: 10px;
    }

    .page-b66app__heading::after {
      content: '';
      position: absolute;
      left: 50%;
      bottom: 0;
      transform: translateX(-50%);
      width: 60px;
      height: 3px;
      background-color: var(--page-b66app__accent-color);
    }

    .page-b66app__section--dark .page-b66app__heading {
      color: var(--page-b66app__light-text-color);
    }
    .page-b66app__section--dark .page-b66app__heading::after {
      background-color: var(--page-b66app__accent-color);
    }

    .page-b66app__text-content {
      font-size: 1.1em;
      margin-bottom: 20px;
      text-align: left;
    }

    .page-b66app__feature-grid {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
      gap: 30px;
      margin-top: 30px;
    }

    .page-b66app__feature-item {
      background-color: var(--page-b66app__light-text-color);
      padding: 25px;
      border-radius: 10px;
      box-shadow: 0 4px 15px var(--page-b66app__shadow-color);
      text-align: center;
      transition: transform 0.3s ease;
      display: flex;
      flex-direction: column;
      align-items: center;
      box-sizing: border-box;
    }

    .page-b66app__feature-item:hover {
      transform: translateY(-5px);
    }

    .page-b66app__feature-icon {
      width: 120px; /* Increased size */
      height: auto;
      margin-bottom: 15px;
      max-width: 100%;
      border-radius: 8px;
    }

    .page-b66app__feature-title {
      font-size: 1.4em;
      color: var(--page-b66app__primary-color);
      margin-bottom: 10px;
    }

    .page-b66app__feature-description {
      font-size: 1em;
      color: var(--page-b66app__secondary-color);
    }

    .page-b66app__download-steps {
      display: flex;
      flex-direction: column;
      gap: 40px;
      margin-top: 40px;
    }

    .page-b66app__step-item {
      display: flex;
      align-items: center;
      gap: 30px;
      text-align: left;
      flex-wrap: wrap;
    }

    .page-b66app__step-item:nth-child(even) {
      flex-direction: row-reverse;
    }

    .page-b66app__step-content {
      flex: 1;
      min-width: 280px;
    }

    .page-b66app__step-number {
      font-size: 2.5em;
      font-weight: bold;
      color: var(--page-b66app__accent-color);
      margin-bottom: 10px;
    }

    .page-b66app__step-title {
      font-size: 1.8em;
      color: var(--page-b66app__primary-color);
      margin-bottom: 15px;
    }

    .page-b66app__step-description {
      font-size: 1.1em;
      color: var(--page-b66app__text-color);
    }

    .page-b66app__step-image-wrapper {
      flex: 1;
      min-width: 280px;
      display: flex;
      justify-content: center;
      align-items: center;
      box-sizing: border-box;
      max-width: 500px; /* Limit image width */
    }

    .page-b66app__step-image {
      width: 100%;
      height: auto;
      border-radius: 10px;
      box-shadow: 0 6px 20px var(--page-b66app__shadow-color);
      max-width: 100%;
      display: block;
    }

    .page-b66app__game-grid {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
      gap: 30px;
      margin-top: 30px;
    }

    .page-b66app__game-card {
      background-color: var(--page-b66app__light-text-color);
      border-radius: 10px;
      box-shadow: 0 4px 15px var(--page-b66app__shadow-color);
      overflow: hidden;
      text-align: center;
      transition: transform 0.3s ease;
      box-sizing: border-box;
    }

    .page-b66app__game-card:hover {
      transform: translateY(-5px);
    }

    .page-b66app__game-image {
      width: 100%;
      height: 200px;
      object-fit: cover;
      display: block;
      max-width: 100%;
    }

    .page-b66app__game-info {
      padding: 20px;
    }

    .page-b66app__game-title {
      font-size: 1.3em;
      color: var(--page-b66app__primary-color);
      margin-bottom: 10px;
    }

    .page-b66app__game-description {
      font-size: 0.95em;
      color: var(--page-b66app__secondary-color);
      margin-bottom: 15px;
    }

    .page-b66app__promo-banner {
      background: linear-gradient(45deg, var(--page-b66app__primary-color), #0056b3);
      color: var(--page-b66app__light-text-color);
      padding: 50px 20px;
      border-radius: 15px;
      margin-top: 50px;
      box-shadow: 0 8px 25px var(--page-b66app__shadow-color);
    }

    .page-b66app__promo-title {
      font-size: 2.8em;
      margin-bottom: 15px;
      font-weight: bold;
    }

    .page-b66app__promo-text {
      font-size: 1.3em;
      margin-bottom: 30px;
    }

    .page-b66app__faq-container {
      margin-top: 50px;
      text-align: left;
    }

    .page-b66app__faq-item {
      background-color: var(--page-b66app__light-text-color);
      border: 1px solid var(--page-b66app__border-color);
      border-radius: 8px;
      margin-bottom: 15px;
      overflow: hidden;
      box-shadow: 0 2px 10px rgba(0, 0, 0, 0.05);
    }

    .page-b66app__faq-question {
      display: flex;
      justify-content: space-between;
      align-items: center;
      padding: 15px 20px;
      cursor: pointer;
      background-color: var(--page-b66app__background-light);
      border-bottom: 1px solid transparent;
      transition: background-color 0.3s ease, border-color 0.3s ease;
      user-select: none;
    }

    .page-b66app__faq-question:hover {
      background-color: #e9ecef;
    }

    .page-b66app__faq-question h3 {
      margin: 0;
      font-size: 1.1em;
      color: var(--page-b66app__primary-color);
      flex-grow: 1;
      pointer-events: none; /* Prevents text from blocking click event */
    }

    .page-b66app__faq-toggle {
      font-size: 1.8em;
      font-weight: bold;
      color: var(--page-b66app__primary-color);
      margin-left: 15px;
      transition: transform 0.3s ease;
      pointer-events: none; /* Prevents icon from blocking click event */
    }

    .page-b66app__faq-item.active .page-b66app__faq-toggle {
      transform: rotate(45deg); /* Change + to X or similar */
    }

    .page-b66app__faq-answer {
      max-height: 0;
      overflow: hidden;
      padding: 0 20px;
      opacity: 0;
      transition: max-height 0.4s cubic-bezier(0.4, 0, 0.2, 1), padding 0.4s ease, opacity 0.4s ease;
      color: var(--page-b66app__text-color);
      font-size: 0.95em;
    }

    .page-b66app__faq-item.active .page-b66app__faq-answer {
      max-height: 2000px !important; /* Sufficiently large */
      padding: 20px !important;
      opacity: 1;
      border-top: 1px solid var(--page-b66app__border-color);
    }

    /* Mobile responsiveness */
    @media (max-width: 768px) {
      .page-b66app__hero-title {
        font-size: 2em;
      }

      .page-b66app__hero-description {
        font-size: 1em;
      }

      .page-b66app__button {
        padding: 10px 20px;
        font-size: 0.9em;
      }

      .page-b66app__floating-button {
        font-size: 1.1em;
        padding: 12px 20px;
      }

      .page-b66app__section {
        padding: 30px 15px;
      }

      .page-b66app__heading {
        font-size: 1.8em;
        margin-bottom: 25px;
      }

      .page-b66app__text-content {
        font-size: 1em;
      }

      .page-b66app__feature-grid {
        grid-template-columns: 1fr;
      }
      
      .page-b66app__feature-item {
        width: 100% !important;
        max-width: 100% !important;
        box-sizing: border-box !important;
        margin-left: 0 !important;
        margin-right: 0 !important;
        padding: 20px;
      }

      .page-b66app__step-item {
        flex-direction: column;
        gap: 20px;
      }

      .page-b66app__step-item:nth-child(even) {
        flex-direction: column;
      }

      .page-b66app__step-title {
        font-size: 1.5em;
      }

      .page-b66app__step-description {
        font-size: 1em;
      }

      .page-b66app__step-image-wrapper {
        width: 100% !important;
        max-width: 100% !important;
        box-sizing: border-box !important;
        padding: 0 !important;
        margin-left: 0 !important;
        margin-right: 0 !important;
      }

      .page-b66app__step-image {
        max-width: 100% !important;
        height: auto !important;
        box-sizing: border-box !important;
        word-wrap: break-word !important;
        overflow-wrap: break-word !important;
      }

      .page-b66app__game-grid {
        grid-template-columns: 1fr;
      }

      .page-b66app__game-card {
        width: 100% !important;
        max-width: 100% !important;
        box-sizing: border-box !important;
        margin-left: 0 !important;
        margin-right: 0 !important;
      }

      .page-b66app__promo-title {
        font-size: 2em;
      }

      .page-b66app__promo-text {
        font-size: 1.1em;
      }

      .page-b66app__faq-question {
        padding: 12px 15px;
      }

      .page-b66app__faq-question h3 {
        font-size: 1em;
      }

      .page-b66app__faq-toggle {
        font-size: 1.5em;
      }

      .page-b66app__faq-answer {
        padding: 0 15px;
      }

      .page-b66app__faq-item.active .page-b66app__faq-answer {
        padding: 15px !important;
      }
    }