:root {
      --page-123b-primary-color: #e03a3e; /* Đỏ rực rỡ */
      --page-123b-secondary-color: #ffc107; /* Vàng nổi bật */
      --page-123b-background-dark: #1a1a2e; /* Nền tối */
      --page-123b-text-light: #f8f9fa; /* Chữ sáng */
      --page-123b-text-dark: #343a40; /* Chữ tối */
      --page-123b-accent-color: #28a745; /* Xanh lá nhấn */
      --page-123b-border-color: rgba(255, 255, 255, 0.1);
    }

    .page-123b {
      font-family: 'Arial', sans-serif;
      background-color: var(--page-123b-background-dark);
      color: var(--page-123b-text-light);
      line-height: 1.6;
      padding-bottom: 80px; /* Cho nút nổi */
    }

    .page-123b-section {
      padding: 20px 15px;
      margin: 0 auto;
      max-width: 1200px;
    }

    .page-123b-banner {
      position: relative;
      width: 100%;
      overflow: hidden;
      margin-bottom: 20px;
    }

    .page-123b-banner img {
      width: 100%;
      height: auto;
      display: block;
      object-fit: cover;
    }

    .page-123b-banner-content {
      position: absolute;
      bottom: 0; /* Đảm bảo banner ở trên, text ở dưới */
      left: 0;
      right: 0;
      background: linear-gradient(to top, rgba(0,0,0,0.8), rgba(0,0,0,0));
      padding: 20px 15px 10px;
      text-align: center;
    }

    .page-123b-banner-content h1 {
      color: var(--page-123b-secondary-color);
      font-size: 2.2em;
      margin-bottom: 10px;
      text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.7);
    }

    .page-123b-banner-content p {
      color: var(--page-123b-text-light);
      font-size: 1.1em;
      margin-bottom: 15px;
    }

    .page-123b-btn {
      display: inline-block;
      background-color: var(--page-123b-primary-color);
      color: var(--page-123b-text-light);
      padding: 12px 25px;
      border-radius: 5px;
      text-decoration: none;
      font-weight: bold;
      transition: background-color 0.3s ease;
      font-size: 1.1em;
      border: none;
      cursor: pointer;
    }

    .page-123b-btn:hover {
      background-color: var(--page-123b-secondary-color);
      color: var(--page-123b-background-dark);
    }

    .page-123b-floating-btn {
      position: fixed;
      bottom: 20px;
      right: 20px;
      left: 20px; /* Căn giữa trên di động */
      width: calc(100% - 40px);
      max-width: 300px; /* Giới hạn chiều rộng trên desktop */
      text-align: center;
      z-index: 1000;
      box-shadow: 0 4px 10px rgba(0, 0, 0, 0.5);
      border-radius: 50px;
      overflow: hidden;
      animation: page-123b-pulse 1.5s infinite;
    }

    .page-123b-floating-btn .page-123b-btn {
      width: 100%;
      padding: 15px 20px;
      border-radius: 50px;
      font-size: 1.2em;
      background-color: var(--page-123b-accent-color);
    }

    .page-123b-floating-btn .page-123b-btn:hover {
      background-color: #218838;
    }

    @keyframes page-123b-pulse {
      0% { transform: scale(1); }
      50% { transform: scale(1.03); }
      100% { transform: scale(1); }
    }

    .page-123b-title {
      color: var(--page-123b-secondary-color);
      text-align: center;
      margin-bottom: 25px;
      font-size: 2em;
      text-transform: uppercase;
      position: relative;
      padding-bottom: 10px;
    }

    .page-123b-title::after {
      content: '';
      position: absolute;
      left: 50%;
      transform: translateX(-50%);
      bottom: 0;
      width: 60px;
      height: 3px;
      background-color: var(--page-123b-primary-color);
      border-radius: 2px;
    }

    .page-123b-grid {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
      gap: 20px;
      margin-top: 20px;
    }

    .page-123b-game-card {
      background-color: rgba(0, 0, 0, 0.4);
      border-radius: 10px;
      overflow: hidden;
      text-align: center;
      padding: 15px;
      box-shadow: 0 4px 8px rgba(0, 0, 0, 0.3);
      transition: transform 0.3s ease, box-shadow 0.3s ease;
      border: 1px solid var(--page-123b-border-color);
    }

    .page-123b-game-card:hover {
      transform: translateY(-5px);
      box-shadow: 0 8px 16px rgba(0, 0, 0, 0.5);
    }

    .page-123b-game-card img {
      width: 100%;
      height: 100px;
      object-fit: contain;
      margin-bottom: 10px;
      border-radius: 5px;
    }

    .page-123b-game-card h3 {
      color: var(--page-123b-secondary-color);
      font-size: 1.1em;
      margin-bottom: 5px;
    }

    .page-123b-game-card p {
      color: var(--page-123b-text-light);
      font-size: 0.9em;
    }

    .page-123b-text-block {
      background-color: rgba(0, 0, 0, 0.4);
      padding: 20px;
      border-radius: 10px;
      margin-top: 20px;
      box-shadow: 0 4px 8px rgba(0, 0, 0, 0.3);
      border: 1px solid var(--page-123b-border-color);
    }

    .page-123b-text-block h2 {
      color: var(--page-123b-primary-color);
      font-size: 1.8em;
      margin-bottom: 15px;
      text-align: center;
    }

    .page-123b-text-block h3 {
      color: var(--page-123b-secondary-color);
      font-size: 1.4em;
      margin-top: 20px;
      margin-bottom: 10px;
    }

    .page-123b-text-block ul {
      list-style-type: disc;
      margin-left: 20px;
      color: var(--page-123b-text-light);
    }

    .page-123b-text-block li {
      margin-bottom: 8px;
    }

    .page-123b-highlight {
      color: var(--page-123b-secondary-color);
      font-weight: bold;
    }

    .page-123b-cta {
      text-align: center;
      margin-top: 40px;
      margin-bottom: 20px;
    }

    .page-123b-cta p {
      font-size: 1.2em;
      margin-bottom: 20px;
      color: var(--page-123b-secondary-color);
    }

    .page-123b-app-download-grid {
      display: flex;
      justify-content: center;
      gap: 20px;
      flex-wrap: wrap;
      margin-top: 20px;
    }

    .page-123b-app-download-item {
      text-align: center;
      background-color: rgba(0, 0, 0, 0.4);
      padding: 20px;
      border-radius: 10px;
      border: 1px solid var(--page-123b-border-color);
      box-shadow: 0 4px 8px rgba(0, 0, 0, 0.3);
      flex: 1 1 150px;
      max-width: 200px;
    }

    .page-123b-app-download-item img {
      width: 80px;
      height: 80px;
      margin-bottom: 10px;
    }

    .page-123b-app-download-item p {
      font-weight: bold;
      color: var(--page-123b-primary-color);
      margin-bottom: 10px;
    }

    .page-123b-app-download-item .page-123b-btn {
      padding: 8px 15px;
      font-size: 0.9em;
    }

    /* Responsive adjustments */
    @media (min-width: 768px) {
      .page-123b-section {
        padding: 30px 20px;
      }

      .page-123b-banner-content h1 {
        font-size: 3em;
      }

      .page-123b-floating-btn {
        right: 30px;
        left: auto;
        width: 280px;
      }

      .page-123b-grid {
        grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
      }

      .page-123b-title {
        font-size: 2.5em;
      }

      .page-123b-text-block h2 {
        font-size: 2em;
      }
    }