/* Reset và các biến cơ bản */
    :root {
      --page-xn88apk-primary-color: #007bff; /* Blue */
      --page-xn88apk-secondary-color: #6c757d; /* Gray */
      --page-xn88apk-accent-color: #ffc107; /* Yellow */
      --page-xn88apk-background-light: #f8f9fa; /* Light Gray */
      --page-xn88apk-background-dark: #343a40; /* Dark Gray */
      --page-xn88apk-text-color: #212529; /* Dark Text */
      --page-xn88apk-text-light: #ffffff; /* White Text */
      --page-xn88apk-border-color: #dee2e6; /* Border Gray */
      --page-xn88apk-success-color: #28a745; /* Green */
      --page-xn88apk-danger-color: #dc3545; /* Red */
    }

    /* Base styles for the page content, ensuring contrast and readability */
    .page-xn88apk {
      font-family: 'Helvetica Neue', Helvetica, Arial, sans-serif;
      line-height: 1.6;
      color: var(--page-xn88apk-text-color);
      background-color: var(--page-xn88apk-background-light);
      padding-bottom: 80px; /* Space for fixed footer/button */
    }

    .page-xn88apk__container {
      max-width: 1200px;
      margin: 0 auto;
      padding: 20px;
      box-sizing: border-box;
    }

    /* Hero Section */
    .page-xn88apk__hero-section {
      position: relative;
      width: 100%;
      background-color: var(--page-xn88apk-background-dark);
      color: var(--page-xn88apk-text-light);
      text-align: center;
      padding: 10px 0 40px; /* Adjusted padding-top for fixed header */
      overflow: hidden;
      box-sizing: border-box;
    }
    .page-xn88apk__hero-background {
      position: absolute;
      top: 0;
      left: 0;
      width: 100%;
      height: 100%;
      object-fit: cover;
      opacity: 0.4;
      z-index: 1;
    }
    .page-xn88apk__hero-content {
      position: relative;
      z-index: 2;
      max-width: 800px;
      margin: 0 auto;
      padding: 40px 20px;
    }
    .page-xn88apk__hero-title {
      font-size: 2.8em;
      margin-bottom: 15px;
      color: var(--page-xn88apk-accent-color);
      line-height: 1.2;
    }
    .page-xn88apk__hero-subtitle {
      font-size: 1.4em;
      margin-bottom: 30px;
      color: var(--page-xn88apk-text-light);
    }
    .page-xn88apk__download-button {
      display: inline-block;
      background-color: var(--page-xn88apk-success-color);
      color: var(--page-xn88apk-text-light);
      padding: 15px 30px;
      border-radius: 8px;
      font-size: 1.2em;
      font-weight: bold;
      text-decoration: none;
      transition: background-color 0.3s ease;
      border: none;
      cursor: pointer;
    }
    .page-xn88apk__download-button:hover {
      background-color: #218838; /* Darker green */
    }

    /* Section styling */
    .page-xn88apk__section {
      padding: 60px 0;
      background-color: var(--page-xn88apk-background-light);
    }
    .page-xn88apk__section--alt {
      background-color: var(--page-xn88apk-background-dark);
      color: var(--page-xn88apk-text-light);
    }
    .page-xn88apk__section-title {
      font-size: 2.2em;
      color: var(--page-xn88apk-primary-color);
      text-align: center;
      margin-bottom: 40px;
      position: relative;
    }
    .page-xn88apk__section--alt .page-xn88apk__section-title {
      color: var(--page-xn88apk-accent-color);
    }
    .page-xn88apk__section-title::after {
      content: '';
      display: block;
      width: 60px;
      height: 4px;
      background-color: var(--page-xn88apk-accent-color);
      margin: 10px auto 0;
      border-radius: 2px;
    }

    /* Feature Grid */
    .page-xn88apk__feature-grid {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
      gap: 30px;
      margin-top: 40px;
    }
    .page-xn88apk__feature-item {
      background-color: var(--page-xn88apk-text-light);
      border-radius: 10px;
      box-shadow: 0 4px 15px rgba(0, 0, 0, 0.1);
      padding: 30px;
      text-align: center;
      transition: transform 0.3s ease, box-shadow 0.3s ease;
      border: 1px solid var(--page-xn88apk-border-color);
    }
    .page-xn88apk__section--alt .page-xn88apk__feature-item {
      background-color: #495057; /* Darker gray */
      color: var(--page-xn88apk-text-light);
      border-color: #6c757d;
    }
    .page-xn88apk__feature-item:hover {
      transform: translateY(-10px);
      box-shadow: 0 8px 25px rgba(0, 0, 0, 0.15);
    }
    .page-xn88apk__feature-icon {
      width: 80px; /* Placeholder, will be overridden by image system */
      height: 80px; /* Placeholder, will be overridden by image system */
      margin-bottom: 20px;
      object-fit: contain;
    }
    .page-xn88apk__feature-title {
      font-size: 1.5em;
      margin-bottom: 15px;
      color: var(--page-xn88apk-primary-color);
    }
    .page-xn88apk__section--alt .page-xn88apk__feature-title {
      color: var(--page-xn88apk-accent-color);
    }
    .page-xn88apk__feature-description {
      font-size: 1em;
      color: var(--page-xn88apk-text-color);
    }
    .page-xn88apk__section--alt .page-xn88apk__feature-description {
      color: var(--page-xn88apk-text-light);
    }

    /* How to Download Section */
    .page-xn88apk__step-list {
      list-style: none;
      padding: 0;
      margin-top: 40px;
    }
    .page-xn88apk__step-item {
      display: flex;
      align-items: flex-start;
      margin-bottom: 30px;
      background-color: var(--page-xn88apk-text-light);
      border-radius: 10px;
      box-shadow: 0 2px 10px rgba(0, 0, 0, 0.08);
      padding: 25px;
      transition: transform 0.3s ease;
    }
    .page-xn88apk__step-item:hover {
      transform: translateY(-5px);
    }
    .page-xn88apk__step-number {
      font-size: 2em;
      font-weight: bold;
      color: var(--page-xn88apk-text-dark); /* Ensure contrast */
      background-color: var(--page-xn88apk-accent-color);
      border-radius: 50%;
      width: 50px;
      height: 50px;
      display: flex;
      justify-content: center;
      align-items: center;
      flex-shrink: 0;
      margin-right: 20px;
    }
    .page-xn88apk__step-content h3 {
      font-size: 1.4em;
      margin-top: 0;
      margin-bottom: 10px;
      color: var(--page-xn88apk-primary-color);
    }
    .page-xn88apk__step-content p {
      margin-bottom: 0;
    }

    /* Game Showcase */
    .page-xn88apk__game-grid {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
      gap: 25px;
      margin-top: 40px;
    }
    .page-xn88apk__game-card {
      background-color: var(--page-xn88apk-text-light);
      border-radius: 10px;
      box-shadow: 0 4px 15px rgba(0, 0, 0, 0.1);
      overflow: hidden;
      text-align: center;
      transition: transform 0.3s ease, box-shadow 0.3s ease;
      border: 1px solid var(--page-xn88apk-border-color);
    }
    .page-xn88apk__game-card:hover {
      transform: translateY(-8px);
      box-shadow: 0 8px 20px rgba(0, 0, 0, 0.12);
    }
    .page-xn88apk__game-image {
      width: 100%;
      height: 200px;
      object-fit: cover;
      display: block;
    }
    .page-xn88apk__game-info {
      padding: 20px;
    }
    .page-xn88apk__game-title {
      font-size: 1.3em;
      margin-top: 0;
      margin-bottom: 10px;
      color: var(--page-xn88apk-primary-color);
    }
    .page-xn88apk__game-description {
      font-size: 0.95em;
      color: var(--page-xn88apk-secondary-color);
    }

    /* Floating Login Button */
    .page-xn88apk__floating-button {
      position: fixed;
      bottom: 20px;
      right: 20px;
      background-color: var(--page-xn88apk-danger-color);
      color: var(--page-xn88apk-text-light);
      padding: 15px 25px;
      border-radius: 50px;
      font-size: 1.1em;
      font-weight: bold;
      text-align: center;
      box-shadow: 0 4px 15px rgba(0, 0, 0, 0.2);
      z-index: 1000;
      cursor: pointer;
      transition: background-color 0.3s ease;
      white-space: nowrap; /* Prevent text wrapping */
      display: flex;
      align-items: center;
      justify-content: center;
      border: none;
    }
    .page-xn88apk__floating-button:hover {
      background-color: #c82333; /* Darker red */
    }
    .page-xn88apk__floating-button-icon {
      margin-right: 10px;
      width: 24px; /* Placeholder, will be overridden by image system */
      height: 24px; /* Placeholder, will be overridden by image system */
      object-fit: contain;
    }

    /* FAQ Section */
    .page-xn88apk__faq-list {
      margin-top: 40px;
    }
    .page-xn88apk__faq-item {
      background-color: var(--page-xn88apk-text-light);
      border: 1px solid var(--page-xn88apk-border-color);
      border-radius: 8px;
      margin-bottom: 15px;
      overflow: hidden;
      box-shadow: 0 2px 8px rgba(0, 0, 0, 0.05);
    }
    .page-xn88apk__faq-question {
      display: flex;
      justify-content: space-between;
      align-items: center;
      padding: 15px 20px;
      background-color: #e9ecef; /* Light gray background for question */
      cursor: pointer;
      user-select: none;
      transition: background-color 0.3s ease;
    }
    .page-xn88apk__faq-question:hover {
      background-color: #e2e6ea;
    }
    .page-xn88apk__faq-question h3 {
      margin: 0;
      font-size: 1.1em;
      color: var(--page-xn88apk-text-color);
      pointer-events: none; /* Prevents text selection from interfering with click */
      flex-grow: 1;
    }
    .page-xn88apk__faq-toggle {
      font-size: 1.5em;
      font-weight: bold;
      color: var(--page-xn88apk-primary-color);
      margin-left: 15px;
      pointer-events: none; /* Prevents text selection from interfering with click */
      transition: transform 0.3s ease;
    }
    .page-xn88apk__faq-item.active .page-xn88apk__faq-toggle {
      transform: rotate(45deg); /* Change + to X or similar */
    }
    .page-xn88apk__faq-answer {
      max-height: 0;
      overflow: hidden;
      padding: 0 20px; /* Initial padding */
      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-xn88apk-text-color);
    }
    .page-xn88apk__faq-item.active .page-xn88apk__faq-answer {
      max-height: 2000px !important; /* Sufficiently large to show all content */
      padding: 20px !important; /* Updated padding for active state */
      opacity: 1;
    }
    .page-xn88apk__faq-answer p {
      margin-bottom: 0;
    }

    /* Responsive adjustments */
    @media (max-width: 768px) {
      .page-xn88apk__container {
        padding: 15px;
      }
      .page-xn88apk__hero-section {
        padding-top: 10px; /* Adjusted padding-top for fixed header on mobile */
      }
      .page-xn88apk__hero-title {
        font-size: 2em;
      }
      .page-xn88apk__hero-subtitle {
        font-size: 1.1em;
      }
      .page-xn88apk__download-button {
        padding: 12px 25px;
        font-size: 1em;
      }
      .page-xn88apk__section {
        padding: 40px 0;
      }
      .page-xn88apk__section-title {
        font-size: 1.8em;
      }
      .page-xn88apk__feature-item,
      .page-xn88apk__step-item,
      .page-xn88apk__game-card {
        padding: 20px;
      }
      .page-xn88apk__feature-title {
        font-size: 1.3em;
      }
      .page-xn88apk__step-number {
        font-size: 1.5em;
        width: 40px;
        height: 40px;
        margin-right: 15px;
      }
      .page-xn88apk__step-content h3 {
        font-size: 1.2em;
      }
      .page-xn88apk__game-image {
        height: 150px;
      }
      .page-xn88apk__game-title {
        font-size: 1.1em;
      }
      .page-xn88apk__floating-button {
        bottom: 15px;
        right: 15px;
        padding: 12px 20px;
        font-size: 0.9em;
      }
      .page-xn88apk__floating-button-icon {
        width: 20px;
        height: 20px;
        margin-right: 8px;
      }
      .page-xn88apk__faq-question {
        padding: 12px 15px;
      }
      .page-xn88apk__faq-question h3 {
        font-size: 1em;
      }
      .page-xn88apk__faq-toggle {
        font-size: 1.2em;
      }
      .page-xn88apk__faq-item.active .page-xn88apk__faq-answer {
        padding: 15px !important;
      }
    }

    /* Ensure images are responsive */
    .page-xn88apk img {
      max-width: 100%;
      height: auto;
      box-sizing: border-box;
    }
    .page-xn88apk__hero-background,
    .page-xn88apk__feature-icon,
    .page-xn88apk__game-image,
    .page-xn88apk__floating-button-icon {
      width: 100%;
      max-width: 100%;
      overflow: hidden;
      box-sizing: border-box;
    }
    @media (max-width: 768px) {
      .page-xn88apk img {
        max-width: 100% !important;
        height: auto !important;
      }
      .page-xn88apk__hero-background,
      .page-xn88apk__feature-icon,
      .page-xn88apk__game-image,
      .page-xn88apk__floating-button-icon {
        width: 100% !important;
        max-width: 100% !important;
      }
    }