:root {
      --page-rio66android-primary-color: #e44d26; /* Cam đậm */
      --page-rio66android-secondary-color: #f7a01d; /* Vàng cam */
      --page-rio66android-text-dark: #333;
      --page-rio66android-text-light: #fff;
      --page-rio66android-bg-light: #f9f9f9;
      --page-rio66android-bg-dark: #2c3e50; /* Xám xanh đậm */
      --page-rio66android-accent-color: #4CAF50; /* Xanh lá cây */
      --page-rio66android-border-radius: 8px;
      --page-rio66android-shadow: 0 4px 15px rgba(0, 0, 0, 0.1);
    }

    .page-rio66android {
      font-family: 'Helvetica Neue', Helvetica, Arial, sans-serif;
      line-height: 1.6;
      color: var(--page-rio66android-text-dark);
      background-color: var(--page-rio66android-bg-light);
      overflow-x: hidden;
    }

    /* Hero Section */
    .page-rio66android__hero-section {
      position: relative;
      background: linear-gradient(135deg, var(--page-rio66android-primary-color), var(--page-rio66android-secondary-color));
      color: var(--page-rio66android-text-light);
      padding: 10px 20px 80px; /* Adjusted padding-top for fixed header */
      text-align: center;
      overflow: hidden;
      display: flex;
      flex-direction: column;
      align-items: center;
      justify-content: center;
    }

    .page-rio66android__hero-banner {
      width: 100%;
      max-width: 1200px;
      height: auto;
      object-fit: cover;
      border-radius: var(--page-rio66android-border-radius);
      box-shadow: var(--page-rio66android-shadow);
      margin-bottom: 30px;
    }

    .page-rio66android__hero-content {
      max-width: 800px;
      margin: 0 auto;
      z-index: 1;
    }

    .page-rio66android__hero-title {
      font-size: 2.8em;
      margin-bottom: 15px;
      color: var(--page-rio66android-text-light);
      font-weight: 700;
    }

    .page-rio66android__hero-subtitle {
      font-size: 1.4em;
      margin-bottom: 30px;
      font-weight: 300;
    }

    .page-rio66android__download-button {
      display: inline-block;
      background-color: var(--page-rio66android-accent-color);
      color: var(--page-rio66android-text-light);
      padding: 15px 35px;
      border-radius: 50px;
      text-decoration: none;
      font-weight: bold;
      font-size: 1.2em;
      transition: background-color 0.3s ease, transform 0.3s ease;
      box-shadow: 0 6px 20px rgba(0, 0, 0, 0.2);
      border: none;
      cursor: pointer;
    }

    .page-rio66android__download-button:hover {
      background-color: #45a049;
      transform: translateY(-3px);
    }

    /* General Section Styling */
    .page-rio66android__section {
      padding: 60px 20px;
      max-width: 1200px;
      margin: 0 auto;
      background-color: var(--page-rio66android-bg-light);
      border-bottom: 1px solid #eee;
    }
    
    .page-rio66android__section:first-of-type { /* If no hero section, this would be the first */
      padding-top: 10px; /* Ensure content is not hidden by fixed header */
    }

    .page-rio66android__section-title {
      font-size: 2.2em;
      color: var(--page-rio66android-primary-color);
      text-align: center;
      margin-bottom: 40px;
      font-weight: 700;
    }

    .page-rio66android__section-subtitle {
      font-size: 1.1em;
      color: var(--page-rio66android-text-dark);
      text-align: center;
      margin-bottom: 30px;
      max-width: 800px;
      margin-left: auto;
      margin-right: auto;
    }

    /* Introduction Section */
    .page-rio66android__intro-grid {
      display: flex;
      flex-wrap: wrap;
      gap: 30px;
      justify-content: center;
      align-items: center;
    }

    .page-rio66android__intro-text {
      flex: 1;
      min-width: 300px;
      max-width: 600px;
      text-align: left;
    }

    .page-rio66android__intro-text p {
      margin-bottom: 15px;
      font-size: 1.1em;
    }

    .page-rio66android__intro-image {
      flex: 1;
      min-width: 300px;
      max-width: 500px;
      text-align: center;
    }

    .page-rio66android__intro-image img {
      width: 100%;
      height: auto;
      border-radius: var(--page-rio66android-border-radius);
      box-shadow: var(--page-rio66android-shadow);
    }

    /* Download Steps Section */
    .page-rio66android__steps-grid {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
      gap: 30px;
    }

    .page-rio66android__step-card {
      background-color: var(--page-rio66android-text-light);
      padding: 30px;
      border-radius: var(--page-rio66android-border-radius);
      box-shadow: var(--page-rio66android-shadow);
      text-align: center;
      transition: transform 0.3s ease;
    }

    .page-rio66android__step-card:hover {
      transform: translateY(-5px);
    }

    .page-rio66android__step-icon {
      width: 100%;
      max-width: 250px;
      height: auto;
      margin-bottom: 20px;
    }

    .page-rio66android__step-title {
      font-size: 1.5em;
      color: var(--page-rio66android-primary-color);
      margin-bottom: 15px;
      font-weight: 600;
    }

    .page-rio66android__step-description {
      font-size: 1em;
      color: var(--page-rio66android-text-dark);
    }

    .page-rio66android__qr-code-container {
      text-align: center;
      margin-top: 40px;
      background-color: var(--page-rio66android-bg-dark);
      padding: 30px;
      border-radius: var(--page-rio66android-border-radius);
      color: var(--page-rio66android-text-light);
    }

    .page-rio66android__qr-code-container img {
      width: 100%;
      max-width: 250px;
      height: auto;
      background-color: var(--page-rio66android-text-light);
      padding: 10px;
      border-radius: var(--page-rio66android-border-radius);
      margin-bottom: 20px;
    }

    .page-rio66android__qr-code-container p {
      font-size: 1.1em;
      margin-bottom: 20px;
    }

    .page-rio66android__qr-code-container .page-rio66android__download-button {
      background-color: var(--page-rio66android-secondary-color);
    }

    .page-rio66android__qr-code-container .page-rio66android__download-button:hover {
      background-color: #e68a00;
    }

    /* Benefits Section */
    .page-rio66android__benefits-list {
      display: flex;
      flex-wrap: wrap;
      gap: 25px;
      justify-content: center;
      padding: 0;
      list-style: none;
    }

    .page-rio66android__benefit-item {
      background-color: var(--page-rio66android-text-light);
      padding: 25px;
      border-radius: var(--page-rio66android-border-radius);
      box-shadow: var(--page-rio66android-shadow);
      flex: 1 1 calc(33% - 25px); /* 3 items per row */
      min-width: 280px;
      display: flex;
      flex-direction: column;
      align-items: center;
      text-align: center;
      box-sizing: border-box; /* Crucial for responsive lists */
    }

    .page-rio66android__benefit-item strong {
      display: block;
      font-size: 1.3em;
      color: var(--page-rio66android-primary-color);
      margin-bottom: 10px;
    }

    .page-rio66android__benefit-item p {
      font-size: 1em;
      color: var(--page-rio66android-text-dark);
    }

    /* Games Section */
    .page-rio66android__games-grid {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
      gap: 30px;
    }

    .page-rio66android__game-card {
      background-color: var(--page-rio66android-text-light);
      border-radius: var(--page-rio66android-border-radius);
      box-shadow: var(--page-rio66android-shadow);
      overflow: hidden;
      text-align: center;
      transition: transform 0.3s ease;
    }

    .page-rio66android__game-card:hover {
      transform: translateY(-5px);
    }

    .page-rio66android__game-image {
      width: 100%;
      height: 200px;
      object-fit: cover;
    }

    .page-rio66android__game-title {
      font-size: 1.4em;
      color: var(--page-rio66android-primary-color);
      padding: 15px;
      font-weight: 600;
    }

    /* FAQ Section */
    .page-rio66android__faq-container {
      margin-top: 40px;
    }

    .page-rio66android__faq-item {
      background-color: var(--page-rio66android-text-light);
      margin-bottom: 15px;
      border-radius: var(--page-rio66android-border-radius);
      box-shadow: 0 2px 10px rgba(0, 0, 0, 0.08);
      overflow: hidden;
    }

    .page-rio66android__faq-question {
      display: flex;
      justify-content: space-between;
      align-items: center;
      padding: 20px 25px;
      background-color: #f0f0f0;
      cursor: pointer;
      user-select: none;
      font-size: 1.1em;
      color: var(--page-rio66android-text-dark);
      font-weight: 600;
      transition: background-color 0.3s ease;
    }

    .page-rio66android__faq-question:hover {
      background-color: #e0e0e0;
    }

    .page-rio66android__faq-question h3 {
      margin: 0;
      flex-grow: 1;
      text-align: left;
      color: var(--page-rio66android-primary-color);
      font-size: 1.1em;
      pointer-events: none; /* Prevent h3 from intercepting click */
    }

    .page-rio66android__faq-toggle {
      font-size: 1.5em;
      font-weight: bold;
      color: var(--page-rio66android-primary-color);
      margin-left: 15px;
      transition: transform 0.3s ease;
      pointer-events: none; /* Prevent toggle from intercepting click */
    }

    .page-rio66android__faq-item.active .page-rio66android__faq-toggle {
      transform: rotate(45deg);
    }

    .page-rio66android__faq-answer {
      max-height: 0;
      overflow: hidden;
      padding: 0 25px;
      background-color: var(--page-rio66android-text-light);
      transition: max-height 0.4s cubic-bezier(0.4, 0, 0.2, 1), padding 0.4s ease, opacity 0.4s ease;
      opacity: 0;
      color: var(--page-rio66android-text-dark);
    }

    .page-rio66android__faq-item.active .page-rio66android__faq-answer {
      max-height: 2000px !important; /* Use !important as required */
      padding: 20px 25px !important; /* Use !important as required */
      opacity: 1;
    }

    .page-rio66android__faq-answer p {
      margin-bottom: 15px;
      font-size: 1em;
    }
    .page-rio66android__faq-answer p:last-child {
      margin-bottom: 0;
    }


    /* Floating Promo Button */
    .page-rio66android__floating-promo {
      position: fixed;
      bottom: 20px;
      right: 20px;
      z-index: 1000;
      background: linear-gradient(90deg, #f7a01d, #e44d26);
      border-radius: 50px;
      box-shadow: 0 8px 25px rgba(0, 0, 0, 0.3);
      padding: 10px 25px;
      animation: pulse 2s infinite;
    }

    .page-rio66android__floating-promo a {
      color: var(--page-rio66android-text-light);
      text-decoration: none;
      font-weight: bold;
      font-size: 1.1em;
      display: flex;
      align-items: center;
      gap: 10px;
    }

    .page-rio66android__floating-promo a::before {
      content: '🎁';
      font-size: 1.2em;
    }

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

    /* Responsive Design */
    @media (max-width: 768px) {
      .page-rio66android__hero-section {
        padding: 10px 15px 60px; /* Adjusted padding-top for fixed header */
      }
      
      .page-rio66android__hero-title {
        font-size: 2em;
      }

      .page-rio66android__hero-subtitle {
        font-size: 1.1em;
      }

      .page-rio66android__download-button {
        padding: 12px 25px;
        font-size: 1em;
      }

      .page-rio66android__section {
        padding: 40px 15px;
      }

      .page-rio66android__section-title {
        font-size: 1.8em;
        margin-bottom: 30px;
      }

      .page-rio66android__intro-grid {
        flex-direction: column;
      }

      .page-rio66android__intro-text,
      .page-rio66android__intro-image {
        min-width: 100%;
        max-width: 100%;
      }

      .page-rio66android__steps-grid,
      .page-rio66android__games-grid {
        grid-template-columns: 1fr;
      }

      .page-rio66android__benefit-item {
        flex: 1 1 100%; /* 1 item per row on mobile */
        max-width: 100% !important; /* Force full width */
        box-sizing: border-box !important;
        margin-left: 0 !important;
        margin-right: 0 !important;
        padding: 20px;
        word-wrap: break-word !important;
        overflow-wrap: break-word !important;
        word-break: break-word !important;
      }
      .page-rio66android__benefits-list {
        width: 100% !important;
        max-width: 100% !important;
        padding: 0 !important;
        margin-left: 0 !important;
        margin-right: 0 !important;
      }
      
      /* Image responsive for mobile */
      .page-rio66android__hero-banner,
      .page-rio66android__intro-image img,
      .page-rio66android__step-icon,
      .page-rio66android__qr-code-container img,
      .page-rio66android__game-image {
        max-width: 100% !important;
        height: auto !important;
        box-sizing: border-box !important;
      }
      .page-rio66android__intro-image,
      .page-rio66android__step-card,
      .page-rio66android__qr-code-container,
      .page-rio66android__game-card {
        width: 100% !important;
        max-width: 100% !important;
        overflow: hidden !important;
        box-sizing: border-box !important;
      }

      .page-rio66android__faq-question {
        padding: 15px 20px;
        font-size: 1em;
      }

      .page-rio66android__faq-question h3 {
        font-size: 1em;
      }

      .page-rio66android__faq-answer {
        padding: 0 20px;
      }
      
      .page-rio66android__faq-item.active .page-rio66android__faq-answer {
        padding: 15px 20px !important;
      }

      .page-rio66android__floating-promo {
        bottom: 15px;
        right: 15px;
        padding: 8px 20px;
      }

      .page-rio66android__floating-promo a {
        font-size: 0.9em;
      }
    }

    @media (max-width: 480px) {
      .page-rio66android__hero-title {
        font-size: 1.8em;
      }
      .page-rio66android__hero-subtitle {
        font-size: 1em;
      }
      .page-rio66android__download-button {
        font-size: 0.9em;
        padding: 10px 20px;
      }
      .page-rio66android__floating-promo {
        bottom: 10px;
        right: 10px;
        padding: 6px 15px;
      }
      .page-rio66android__floating-promo a {
        font-size: 0.85em;
      }
    }