/* CSS cho trang rr88 */
    .page-rr88-container {
      font-family: 'Arial', sans-serif;
      color: #333333;
      background-color: #f5f5f5;
      line-height: 1.6;
      overflow-x: hidden;
      padding-bottom: 80px; /* Để tránh nút nổi bị che */
    }

    .page-rr88-banner {
      width: 100%;
      max-width: 1200px;
      margin: 0 auto;
      text-align: center;
      position: relative;
      background-color: #0a192f; /* Màu nền cho banner */
      overflow: hidden;
      border-radius: 8px;
      margin-top: 10px;
      box-shadow: 0 4px 15px rgba(0, 0, 0, 0.2);
    }

    .page-rr88-banner img {
      width: 100%;
      height: auto;
      display: block;
      object-fit: cover;
      max-height: 300px; /* Giới hạn chiều cao banner trên di động */
    }

    .page-rr88-banner-text {
      position: absolute;
      bottom: 0;
      left: 0;
      right: 0;
      background: linear-gradient(to top, rgba(0, 0, 0, 0.8), rgba(0, 0, 0, 0));
      color: #ffffff;
      padding: 15px 10px;
      font-size: 1.1em;
      text-shadow: 1px 1px 3px rgba(0, 0, 0, 0.7);
      text-align: center;
    }

    .page-rr88-banner-text h1 {
      font-size: 1.8em;
      margin-bottom: 5px;
      color: #ffc107;
    }

    .page-rr88-banner-text p {
      font-size: 0.9em;
      margin: 0;
    }

    .page-rr88-section {
      padding: 20px 15px;
      margin: 15px auto;
      max-width: 1200px;
      background-color: #ffffff;
      border-radius: 8px;
      box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
    }

    .page-rr88-section h2 {
      color: #2c3e50;
      text-align: center;
      margin-bottom: 25px;
      font-size: 1.8em;
      position: relative;
    }
    .page-rr88-section h2::after {
      content: '';
      display: block;
      width: 60px;
      height: 3px;
      background-color: #ffc107;
      margin: 10px auto 0;
    }

    .page-rr88-section h3 {
      color: #34495e;
      font-size: 1.4em;
      margin-top: 20px;
      margin-bottom: 15px;
    }

    .page-rr88-grid {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
      gap: 15px;
      justify-content: center;
      text-align: center;
    }

    .page-rr88-card {
      background-color: #f9f9f9;
      padding: 15px;
      border-radius: 8px;
      box-shadow: 0 1px 5px rgba(0, 0, 0, 0.08);
      transition: transform 0.2s ease-in-out, box-shadow 0.2s ease-in-out;
      display: flex;
      flex-direction: column;
      align-items: center;
    }

    .page-rr88-card:hover {
      transform: translateY(-5px);
      box-shadow: 0 4px 15px rgba(0, 0, 0, 0.15);
    }

    .page-rr88-card img {
      width: 80px;
      height: 80px;
      object-fit: contain;
      margin-bottom: 10px;
      border-radius: 5px;
    }

    .page-rr88-card h4 {
      margin: 0;
      font-size: 1.1em;
      color: #2c3e50;
    }

    .page-rr88-card a {
      text-decoration: none;
      color: #2c3e50;
      font-weight: bold;
    }

    .page-rr88-card a:hover {
      color: #007bff;
    }

    .page-rr88-floating-buttons {
      position: fixed;
      bottom: 0;
      left: 0;
      width: 100%;
      display: flex;
      justify-content: space-around;
      padding: 10px 0;
      background-color: #2c3e50;
      box-shadow: 0 -2px 10px rgba(0, 0, 0, 0.3);
      z-index: 1000;
    }

    .page-rr88-btn {
      display: inline-block;
      padding: 12px 25px;
      border-radius: 50px;
      text-decoration: none;
      font-weight: bold;
      font-size: 1.1em;
      text-align: center;
      transition: background-color 0.3s ease, transform 0.2s ease;
      box-shadow: 0 4px 10px rgba(0, 0, 0, 0.2);
      white-space: nowrap;
      flex-grow: 1;
      margin: 0 5px;
      max-width: 48%; /* Adjust for mobile spacing */
    }

    .page-rr88-btn-register {
      background-color: #ffc107;
      color: #2c3e50;
    }

    .page-rr88-btn-register:hover {
      background-color: #e0a800;
      transform: translateY(-2px);
    }

    .page-rr88-btn-login {
      background-color: #007bff;
      color: #ffffff;
    }

    .page-rr88-btn-login:hover {
      background-color: #0056b3;
      transform: translateY(-2px);
    }

    .page-rr88-promo-text {
      font-size: 0.8em;
      display: block;
      margin-top: 5px;
      opacity: 0.9;
    }

    .page-rr88-list {
      list-style: none;
      padding: 0;
      margin-top: 15px;
    }

    .page-rr88-list li {
      background-color: #f0f0f0;
      margin-bottom: 8px;
      padding: 10px 15px;
      border-left: 5px solid #ffc107;
      border-radius: 4px;
      font-size: 0.95em;
    }

    .page-rr88-highlight {
      color: #007bff;
      font-weight: bold;
    }

    /* Responsive adjustments */
    @media (min-width: 768px) {
      .page-rr88-banner img {
        max-height: 400px;
      }
      .page-rr88-banner-text h1 {
        font-size: 2.5em;
      }
      .page-rr88-banner-text p {
        font-size: 1.1em;
      }
      .page-rr88-section {
        padding: 30px;
      }
      .page-rr88-section h2 {
        font-size: 2.5em;
      }
      .page-rr88-grid {
        grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
      }
      .page-rr88-btn {
        padding: 15px 35px;
        font-size: 1.2em;
        max-width: 200px; /* Limit width on desktop */
      }
      .page-rr88-floating-buttons {
        justify-content: center;
        padding: 15px 0;
      }
      .page-rr88-floating-buttons .page-rr88-btn {
        margin: 0 15px;
      }
    }