:root {
      --page-kuapp-primary-color: #E74C3C; /* Đỏ rực */
      --page-kuapp-secondary-color: #F39C12; /* Cam */
      --page-kuapp-text-color: #333;
      --page-kuapp-light-bg: #f8f9fa;
      --page-kuapp-dark-bg: #2c3e50; /* Xám xanh đậm */
      --page-kuapp-white: #fff;
      --page-kuapp-border-color: #ddd;
      --page-kuapp-shadow: rgba(0, 0, 0, 0.1);
    }

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

    .page-kuapp__section {
      padding: 40px 20px;
      margin-bottom: 20px;
      background-color: var(--page-kuapp-white);
      border-radius: 8px;
      box-shadow: 0 4px 12px var(--page-kuapp-shadow);
      max-width: 1200px;
      margin-left: auto;
      margin-right: auto;
    }

    .page-kuapp__section--dark {
      background-color: var(--page-kuapp-dark-bg);
      color: var(--page-kuapp-white);
    }

    .page-kuapp__container {
      max-width: 1200px;
      margin: 0 auto;
      padding: 0 15px;
    }

    .page-kuapp__h1, .page-kuapp__h2, .page-kuapp__h3 {
      color: var(--page-kuapp-primary-color);
      text-align: center;
      margin-bottom: 25px;
      font-weight: bold;
    }

    .page-kuapp__h1 {
      font-size: 2.5em;
      color: var(--page-kuapp-white); /* For hero section */
    }

    .page-kuapp__h2 {
      font-size: 2em;
      color: var(--page-kuapp-primary-color);
    }

    .page-kuapp__h3 {
      font-size: 1.5em;
      color: var(--page-kuapp-dark-bg);
    }

    .page-kuapp__paragraph {
      margin-bottom: 15px;
      text-align: justify;
    }

    .page-kuapp__list {
      list-style: none;
      padding-left: 0;
    }

    .page-kuapp__list-item {
      margin-bottom: 10px;
      padding-left: 25px;
      position: relative;
    }

    .page-kuapp__list-item::before {
      content: '✔';
      color: var(--page-kuapp-primary-color);
      position: absolute;
      left: 0;
      font-weight: bold;
    }

    .page-kuapp__button {
      display: inline-block;
      background-color: var(--page-kuapp-primary-color);
      color: var(--page-kuapp-white);
      padding: 12px 25px;
      border-radius: 30px;
      text-decoration: none;
      font-weight: bold;
      transition: background-color 0.3s ease, transform 0.3s ease;
      border: none;
      cursor: pointer;
      font-size: 1em;
      text-align: center;
    }

    .page-kuapp__button:hover {
      background-color: #C0392B; /* Darker red */
      transform: translateY(-2px);
    }

    .page-kuapp__button--large {
      padding: 15px 30px;
      font-size: 1.2em;
      border-radius: 40px;
    }

    /* Hero Section */
    .page-kuapp__hero-section {
      position: relative;
      background-color: var(--page-kuapp-dark-bg);
      color: var(--page-kuapp-white);
      text-align: center;
      padding: 10px 20px 60px; /* Adjusted padding-top for fixed header */
      overflow: hidden;
      display: flex;
      flex-direction: column;
      justify-content: center;
      align-items: center;
      min-height: 400px;
      box-sizing: border-box;
    }

    .page-kuapp__hero-image {
      position: absolute;
      top: 0;
      left: 0;
      width: 100%;
      height: 100%;
      object-fit: cover;
      opacity: 0.4;
      z-index: 1;
    }

    .page-kuapp__hero-content {
      position: relative;
      z-index: 2;
      max-width: 800px;
      margin: 0 auto;
    }

    .page-kuapp__hero-subtitle {
      font-size: 1.2em;
      margin-bottom: 30px;
    }

    /* Floating Promotion Button */
    .page-kuapp__floating-promo {
      position: fixed;
      bottom: 20px;
      left: 50%;
      transform: translateX(-50%);
      z-index: 1000;
      width: calc(100% - 40px);
      max-width: 400px;
      text-align: center;
    }

    .page-kuapp__floating-promo-button {
      background-color: var(--page-kuapp-secondary-color);
      color: var(--page-kuapp-white);
      padding: 15px 20px;
      border-radius: 50px;
      font-size: 1.1em;
      font-weight: bold;
      box-shadow: 0 6px 20px rgba(0, 0, 0, 0.3);
      animation: page-kuapp__pulse 2s infinite;
      display: block; /* Make it a block element for full width */
      text-decoration: none;
      border: none;
      cursor: pointer;
    }

    .page-kuapp__floating-promo-button:hover {
      background-color: #E67E22; /* Darker orange */
      animation: none;
    }

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

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

    .page-kuapp__game-card {
      background-color: var(--page-kuapp-white);
      border-radius: 10px;
      box-shadow: 0 4px 10px rgba(0, 0, 0, 0.1);
      overflow: hidden;
      text-align: center;
      transition: transform 0.3s ease, box-shadow 0.3s ease;
    }

    .page-kuapp__game-card:hover {
      transform: translateY(-5px);
      box-shadow: 0 8px 16px rgba(0, 0, 0, 0.2);
    }

    .page-kuapp__game-card-image {
      width: 100%;
      height: 200px; /* Fixed height for consistency */
      object-fit: cover;
      display: block;
    }

    .page-kuapp__game-card-content {
      padding: 20px;
    }

    .page-kuapp__game-card-title {
      font-size: 1.3em;
      color: var(--page-kuapp-dark-bg);
      margin-top: 0;
      margin-bottom: 10px;
    }

    .page-kuapp__game-card-description {
      font-size: 0.9em;
      color: #666;
      margin-bottom: 15px;
    }

    /* Download Section */
    .page-kuapp__download-steps {
      display: flex;
      flex-wrap: wrap;
      justify-content: center;
      gap: 20px;
      margin-top: 30px;
    }

    .page-kuapp__download-step {
      background-color: var(--page-kuapp-light-bg);
      border: 1px solid var(--page-kuapp-border-color);
      border-radius: 8px;
      padding: 25px;
      text-align: center;
      flex: 1 1 calc(33% - 40px);
      min-width: 280px;
      box-shadow: 0 2px 5px rgba(0, 0, 0, 0.05);
      transition: transform 0.3s ease;
    }

    .page-kuapp__download-step:hover {
      transform: translateY(-5px);
    }

    .page-kuapp__download-step-icon {
      width: 80px;
      height: 80px;
      margin-bottom: 15px;
      object-fit: contain;
    }

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

    /* Why Choose Section */
    .page-kuapp__features-grid {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
      gap: 25px;
      margin-top: 30px;
    }

    .page-kuapp__feature-item {
      background-color: var(--page-kuapp-white);
      border-radius: 10px;
      padding: 25px;
      text-align: center;
      box-shadow: 0 4px 10px rgba(0, 0, 0, 0.08);
      transition: transform 0.3s ease;
    }

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

    .page-kuapp__feature-icon {
      width: 100px;
      height: 100px;
      margin-bottom: 15px;
      object-fit: contain;
    }

    .page-kuapp__feature-title {
      font-size: 1.3em;
      color: var(--page-kuapp-dark-bg);
      margin-bottom: 10px;
    }

    /* FAQ Section */
    .page-kuapp__faq-section {
      background-color: var(--page-kuapp-light-bg);
      padding: 40px 20px;
      border-radius: 8px;
      box-shadow: 0 4px 12px var(--page-kuapp-shadow);
      max-width: 1200px;
      margin-left: auto;
      margin-right: auto;
      margin-bottom: 20px;
    }

    .page-kuapp__faq-item {
      background-color: var(--page-kuapp-white);
      border: 1px solid var(--page-kuapp-border-color);
      border-radius: 8px;
      margin-bottom: 15px;
      overflow: hidden;
    }

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

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

    .page-kuapp__faq-question h3 {
      margin: 0;
      color: var(--page-kuapp-dark-bg);
      font-size: 1.1em;
      pointer-events: none; /* Prevent h3 from blocking click */
    }

    .page-kuapp__faq-toggle {
      font-size: 1.8em;
      font-weight: bold;
      color: var(--page-kuapp-primary-color);
      transition: transform 0.3s ease;
      pointer-events: none; /* Prevent toggle from blocking click */
    }

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

    .page-kuapp__faq-answer {
      max-height: 0;
      overflow: hidden;
      padding: 0 15px; /* 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;
      background-color: var(--page-kuapp-white);
      color: var(--page-kuapp-text-color);
    }

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

    .page-kuapp__faq-answer p {
      margin-bottom: 10px;
    }

    .page-kuapp__faq-answer p:last-child {
      margin-bottom: 0;
    }

    /* Responsive Design */
    @media (max-width: 768px) {
      .page-kuapp__hero-section {
        padding-top: 10px; /* Mobile padding for fixed header */
        min-height: 300px;
      }

      .page-kuapp__h1 {
        font-size: 1.8em;
      }

      .page-kuapp__h2 {
        font-size: 1.6em;
      }

      .page-kuapp__h3 {
        font-size: 1.3em;
      }

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

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

      .page-kuapp__download-step {
        flex: 1 1 100%;
        min-width: unset;
      }

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

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

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

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

      .page-kuapp__faq-answer {
        padding: 0 10px;
      }

      .page-kuapp__faq-item.active .page-kuapp__faq-answer {
        padding: 15px 10px !important;
      }

      /* Image responsiveness for mobile */
      .page-kuapp img {
        max-width: 100% !important;
        height: auto !important;
      }
      .page-kuapp__hero-image {
        max-width: 100% !important;
        height: auto !important;
      }
      .page-kuapp__game-card-image {
        max-width: 100% !important;
        height: auto !important;
      }
      .page-kuapp__download-step-icon {
        max-width: 100% !important;
        height: auto !important;
      }
      .page-kuapp__feature-icon {
        max-width: 100% !important;
        height: auto !important;
      }
    }

    /* General image container styles */
    .page-kuapp__image-wrapper {
      width: 100%;
      max-width: 100%;
      overflow: hidden;
      box-sizing: border-box;
      display: flex; /* For centering images */
      justify-content: center;
      align-items: center;
    }
    .page-kuapp__image-wrapper img {
      max-width: 100%;
      height: auto;
      display: block;
    }
    .page-kuapp__product-image {
        width: 100%; /* Ensure product images take full width of their container */
        height: auto;
        display: block;
        margin: 0 auto; /* Center product images */
    }