:root {
      --page-ok789app-primary-color: #e44d26; /* Cam đậm */
      --page-ok789app-secondary-color: #333;
      --page-ok789app-accent-color: #ffcc00; /* Vàng sáng */
      --page-ok789app-text-color: #333;
      --page-ok789app-light-text-color: #f8f8f8;
      --page-ok789app-background-light: #f4f4f4;
      --page-ok789app-background-dark: #222;
      --page-ok789app-border-radius: 8px;
      --page-ok789app-padding-section: 40px 20px;
    }

    /* Base styles for the page content */
    .page-ok789app {
      font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
      line-height: 1.6;
      color: var(--page-ok789app-text-color);
      background-color: var(--page-ok789app-background-light);
      max-width: 100%;
      overflow-x: hidden;
    }

    .page-ok789app__container {
      max-width: 1200px;
      margin: 0 auto;
      padding: 0 15px;
      box-sizing: border-box;
    }

    .page-ok789app__section {
      padding: var(--page-ok789app-padding-section);
      text-align: center;
    }

    .page-ok789app__section--dark {
      background-color: var(--page-ok789app-background-dark);
      color: var(--page-ok789app-light-text-color);
    }

    .page-ok789app__section-title {
      font-size: 2.5em;
      color: var(--page-ok789app-primary-color);
      margin-bottom: 25px;
      font-weight: 700;
    }

    .page-ok789app__section-title--light {
      color: var(--page-ok789app-accent-color);
    }

    .page-ok789app__section-subtitle {
      font-size: 1.2em;
      margin-bottom: 30px;
      color: #666;
    }

    .page-ok789app__section-subtitle--light {
      color: #ccc;
    }

    /* Hero Section */
    .page-ok789app__hero-section {
      background-color: #f9f9f9;
      padding-top: 80px; /* Adjusted for fixed header */
      padding-bottom: 40px;
      position: relative;
      overflow: hidden;
    }

    .page-ok789app__hero-image {
      width: 100%;
      height: 450px; /* Fixed height for banner */
      object-fit: cover;
      display: block;
      margin: 0 auto 30px auto;
      border-radius: var(--page-ok789app-border-radius);
      box-shadow: 0 8px 16px rgba(0, 0, 0, 0.2);
    }

    .page-ok789app__hero-content {
      position: relative;
      z-index: 1;
      padding: 20px;
      background: rgba(255, 255, 255, 0.9);
      border-radius: var(--page-ok789app-border-radius);
      box-shadow: 0 4px 8px rgba(0, 0, 0, 0.1);
      margin-top: -80px; /* Overlap with image */
      text-align: center;
    }

    .page-ok789app__hero-title {
      font-size: 3em;
      color: var(--page-ok789app-primary-color);
      margin-bottom: 15px;
      line-height: 1.2;
    }

    .page-ok789app__hero-description {
      font-size: 1.1em;
      color: var(--page-ok789app-secondary-color);
      margin-bottom: 30px;
    }

    .page-ok789app__cta-button {
      display: inline-block;
      background-color: var(--page-ok789app-primary-color);
      color: var(--page-ok789app-light-text-color);
      padding: 15px 30px;
      border-radius: var(--page-ok789app-border-radius);
      text-decoration: none;
      font-weight: bold;
      font-size: 1.1em;
      transition: background-color 0.3s ease, transform 0.3s ease;
      box-shadow: 0 4px 8px rgba(0, 0, 0, 0.2);
      border: none;
      cursor: pointer;
    }

    .page-ok789app__cta-button:hover {
      background-color: #c73c1d;
      transform: translateY(-3px);
    }

    /* Floating Login Button */
    .page-ok789app__floating-button {
      position: fixed;
      bottom: 20px;
      right: 20px;
      background-color: var(--page-ok789app-accent-color);
      color: var(--page-ok789app-secondary-color);
      padding: 15px 25px;
      border-radius: 50px;
      text-decoration: none;
      font-weight: bold;
      font-size: 1.1em;
      box-shadow: 0 4px 12px rgba(0, 0, 0, 0.3);
      z-index: 1000;
      display: flex;
      align-items: center;
      gap: 10px;
      transition: background-color 0.3s ease, transform 0.3s ease;
      animation: page-ok789app__pulse 2s infinite;
      border: none;
      cursor: pointer;
    }

    .page-ok789app__floating-button:hover {
      background-color: #ffd700;
      transform: scale(1.05);
    }

    @keyframes page-ok789app__pulse {
      0% { transform: scale(1); }
      50% { transform: scale(1.05); }
      100% { transform: scale(1); }
    }

    /* Features Section */
    .page-ok789app__features-list {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
      gap: 30px;
      margin-top: 40px;
      list-style: none;
      padding: 0;
    }

    .page-ok789app__feature-item {
      background-color: #fff;
      padding: 30px;
      border-radius: var(--page-ok789app-border-radius);
      box-shadow: 0 4px 10px rgba(0, 0, 0, 0.08);
      text-align: center;
      transition: transform 0.3s ease;
      box-sizing: border-box; /* Ensure padding and border are included in width */
    }

    .page-ok789app__feature-item:hover {
      transform: translateY(-5px);
    }

    .page-ok789app__feature-icon {
      width: 80px;
      height: 80px;
      margin-bottom: 20px;
      object-fit: contain;
    }

    .page-ok789app__feature-title {
      font-size: 1.4em;
      color: var(--page-ok789app-primary-color);
      margin-bottom: 15px;
    }

    .page-ok789app__feature-description {
      font-size: 1em;
      color: #555;
    }

    /* Download Steps Section */
    .page-ok789app__download-steps {
      display: flex;
      flex-direction: column;
      gap: 30px;
      margin-top: 40px;
    }

    .page-ok789app__step-item {
      background-color: #fff;
      padding: 30px;
      border-radius: var(--page-ok789app-border-radius);
      box-shadow: 0 4px 10px rgba(0, 0, 0, 0.08);
      text-align: left;
      display: flex;
      align-items: center;
      gap: 25px;
      box-sizing: border-box;
    }

    .page-ok789app__step-number {
      font-size: 2.5em;
      font-weight: bold;
      color: var(--page-ok789app-primary-color);
      flex-shrink: 0;
      width: 60px;
      height: 60px;
      display: flex;
      align-items: center;
      justify-content: center;
      border: 3px solid var(--page-ok789app-primary-color);
      border-radius: 50%;
    }

    .page-ok789app__step-content {
      flex-grow: 1;
    }

    .page-ok789app__step-title {
      font-size: 1.5em;
      color: var(--page-ok789app-secondary-color);
      margin-bottom: 10px;
    }

    .page-ok789app__step-description {
      font-size: 1em;
      color: #555;
    }

    .page-ok789app__download-qr-codes {
      display: flex;
      justify-content: center;
      gap: 40px;
      margin-top: 40px;
      flex-wrap: wrap;
    }

    .page-ok789app__qr-code-item {
      text-align: center;
    }

    .page-ok789app__qr-image {
      width: 200px;
      height: 200px;
      border: 1px solid #ddd;
      border-radius: var(--page-ok789app-border-radius);
      margin-bottom: 15px;
      object-fit: contain;
    }

    .page-ok789app__qr-label {
      font-weight: bold;
      font-size: 1.1em;
      color: var(--page-ok789app-primary-color);
    }

    /* Game Section */
    .page-ok789app__game-grid {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
      gap: 30px;
      margin-top: 40px;
    }

    .page-ok789app__game-card {
      background-color: #fff;
      border-radius: var(--page-ok789app-border-radius);
      box-shadow: 0 4px 10px rgba(0, 0, 0, 0.08);
      overflow: hidden;
      text-align: center;
      transition: transform 0.3s ease;
      box-sizing: border-box;
    }

    .page-ok789app__game-card:hover {
      transform: translateY(-5px);
    }

    .page-ok789app__game-image {
      width: 100%;
      height: 200px;
      object-fit: cover;
      display: block;
    }

    .page-ok789app__game-content {
      padding: 20px;
    }

    .page-ok789app__game-title {
      font-size: 1.3em;
      color: var(--page-ok789app-primary-color);
      margin-bottom: 10px;
    }

    .page-ok789app__game-description {
      font-size: 0.95em;
      color: #666;
    }

    /* Promotion Section */
    .page-ok789app__promotion-list {
      display: grid;
      grid-template-columns: 1fr;
      gap: 25px;
      margin-top: 40px;
      list-style: none;
      padding: 0;
    }

    .page-ok789app__promotion-item {
      background-color: #fff;
      padding: 25px;
      border-radius: var(--page-ok789app-border-radius);
      box-shadow: 0 4px 10px rgba(0, 0, 0, 0.08);
      text-align: left;
      border-left: 5px solid var(--page-ok789app-primary-color);
      box-sizing: border-box;
    }

    .page-ok789app__promotion-title {
      font-size: 1.5em;
      color: var(--page-ok789app-secondary-color);
      margin-bottom: 10px;
    }

    .page-ok789app__promotion-description {
      font-size: 1em;
      color: #555;
    }

    /* FAQ Section */
    .page-ok789app__faq-section {
      background-color: var(--page-ok789app-background-light);
      padding: var(--page-ok789app-padding-section);
      text-align: center;
    }

    .page-ok789app__faq-list {
      margin-top: 40px;
      max-width: 800px;
      margin-left: auto;
      margin-right: auto;
      text-align: left;
      list-style: none;
      padding: 0;
    }

    .page-ok789app__faq-item {
      background-color: #fff;
      margin-bottom: 15px;
      border-radius: var(--page-ok789app-border-radius);
      box-shadow: 0 2px 5px rgba(0, 0, 0, 0.05);
      overflow: hidden;
      box-sizing: border-box;
    }

    .page-ok789app__faq-question {
      display: flex;
      justify-content: space-between;
      align-items: center;
      padding: 15px 20px;
      cursor: pointer;
      background-color: #f0f0f0;
      border-bottom: 1px solid #eee;
      transition: background-color 0.3s ease;
      user-select: none;
    }

    .page-ok789app__faq-question:hover {
      background-color: #e8e8e8;
    }

    .page-ok789app__faq-question h3 {
      margin: 0;
      font-size: 1.1em;
      color: var(--page-ok789app-secondary-color);
      pointer-events: none; /* Prevent h3 from blocking click event */
    }

    .page-ok789app__faq-toggle {
      font-size: 1.5em;
      font-weight: bold;
      color: var(--page-ok789app-primary-color);
      transition: transform 0.3s ease;
      pointer-events: none; /* Prevent toggle from blocking click event */
    }

    .page-ok789app__faq-item.active .page-ok789app__faq-toggle {
      transform: rotate(45deg); /* Change + to X or - */
    }

    .page-ok789app__faq-answer {
      max-height: 0;
      overflow: hidden;
      padding: 0 20px; /* Initial padding */
      transition: max-height 0.4s cubic-bezier(0.4, 0, 0.2, 1), padding 0.4s ease, opacity 0.4s ease;
      opacity: 0;
      color: #555;
      font-size: 0.95em;
    }

    .page-ok789app__faq-item.active .page-ok789app__faq-answer {
      max-height: 2000px !important; /* Sufficiently large height */
      padding: 20px !important; /* Final padding */
      opacity: 1;
    }

    /* Responsive Design */
    @media (max-width: 768px) {
      .page-ok789app__hero-section {
        padding-top: 60px; /* Adjusted for mobile fixed header */
      }

      .page-ok789app__hero-image {
        height: 300px;
        margin-bottom: 20px;
      }

      .page-ok789app__hero-content {
        margin-top: -60px;
      }

      .page-ok789app__hero-title {
        font-size: 2em;
      }

      .page-ok789app__hero-description {
        font-size: 1em;
      }

      .page-ok789app__section-title {
        font-size: 2em;
      }

      .page-ok789app__section-subtitle {
        font-size: 1em;
      }

      .page-ok789app__features-list,
      .page-ok789app__game-grid,
      .page-ok789app__promotion-list,
      .page-ok789app__download-steps {
        grid-template-columns: 1fr;
        gap: 20px;
        width: 100% !important;
        max-width: 100% !important;
        padding: 0 !important;
        margin-left: 0 !important;
        margin-right: 0 !important;
        box-sizing: border-box !important;
      }

      .page-ok789app__feature-item,
      .page-ok789app__step-item,
      .page-ok789app__game-card,
      .page-ok789app__promotion-item,
      .page-ok789app__faq-item {
        width: 100% !important;
        max-width: 100% !important;
        padding: 20px !important;
        margin-left: 0 !important;
        margin-right: 0 !important;
        box-sizing: border-box !important;
        word-wrap: break-word !important;
        overflow-wrap: break-word !important;
        word-break: break-word !important;
      }

      .page-ok789app__download-qr-codes {
        flex-direction: column;
        gap: 20px;
      }

      .page-ok789app__step-item {
        flex-direction: column;
        text-align: center;
      }

      .page-ok789app__step-number {
        margin-bottom: 15px;
      }

      .page-ok789app__floating-button {
        bottom: 15px;
        right: 15px;
        padding: 12px 20px;
        font-size: 0.95em;
      }
    }

    @media (max-width: 480px) {
      .page-ok789app__hero-title {
        font-size: 1.8em;
      }

      .page-ok789app__section-title {
        font-size: 1.8em;
      }

      .page-ok789app__cta-button {
        padding: 12px 25px;
        font-size: 1em;
      }

      .page-ok789app__floating-button {
        bottom: 10px;
        right: 10px;
        padding: 10px 18px;
        font-size: 0.9em;
      }
    }