/* CSS cho trang b52, đổi thưởng */
    .page-b52code {
      font-family: 'Arial', sans-serif;
      background-color: #0d1a26; /* Nền tối, dễ nhìn */
      color: #e0e0e0; /* Chữ sáng, tương phản cao */
      line-height: 1.6;
      padding-bottom: 80px; /* Khoảng trống cho nút cố định */
    }

    .page-b52code .container {
      max-width: 1200px;
      margin: 0 auto;
      padding: 0 15px;
    }

    .page-b52code .section {
      padding: 40px 0;
      text-align: center;
    }

    .page-b52code .section-dark {
      background-color: #1a2c38;
    }

    .page-b52code h1, .page-b52code h2, .page-b52code h3 {
      color: #ffcc00; /* Màu vàng nổi bật */
      margin-bottom: 20px;
    }

    .page-b52code h1 {
      font-size: 2.5em;
      margin-bottom: 30px;
      text-transform: uppercase;
    }

    .page-b52code h2 {
      font-size: 2em;
      margin-top: 30px;
    }

    .page-b52code h3 {
      font-size: 1.5em;
      margin-top: 25px;
    }

    .page-b52code p {
      margin-bottom: 15px;
      font-size: 1.1em;
    }

    .page-b52code .hero-banner {
      width: 100%;
      overflow: hidden;
      margin-bottom: 30px;
      position: relative;
    }

    .page-b52code .hero-banner img {
      width: 100%;
      height: auto;
      display: block;
      object-fit: cover;
      max-height: 400px; /* Giới hạn chiều cao banner */
    }

    .page-b52code .floating-buttons {
      position: fixed;
      bottom: 0;
      left: 0;
      width: 100%;
      display: flex;
      justify-content: space-around;
      padding: 10px 0;
      background-color: rgba(0, 0, 0, 0.8);
      z-index: 1000;
      box-shadow: 0 -2px 10px rgba(0, 0, 0, 0.5);
    }

    .page-b52code .floating-buttons a {
      display: block;
      width: 45%;
      padding: 12px 0;
      text-align: center;
      text-decoration: none;
      border-radius: 8px;
      font-weight: bold;
      font-size: 1.1em;
      transition: background-color 0.3s ease, transform 0.2s ease;
      color: #fff; /* Màu chữ trắng */
    }

    .page-b52code .btn-register {
      background-color: #e74c3c; /* Đỏ rực */
    }

    .page-b52code .btn-login {
      background-color: #3498db; /* Xanh dương */
    }

    .page-b52code .floating-buttons a:hover {
      transform: translateY(-2px);
    }

    .page-b52code .btn-register:hover {
      background-color: #c0392b;
    }

    .page-b52code .btn-login:hover {
      background-color: #2980b9;
    }

    .page-b52code .game-grid {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
      gap: 20px;
      margin-top: 30px;
    }

    .page-b52code .game-card {
      background-color: #1a2c38;
      border-radius: 10px;
      padding: 15px;
      box-shadow: 0 4px 8px rgba(0, 0, 0, 0.3);
      transition: transform 0.2s ease;
      text-decoration: none;
      color: inherit;
    }

    .page-b52code .game-card:hover {
      transform: translateY(-5px);
    }

    .page-b52code .game-card img {
      width: 100%;
      height: 100px;
      object-fit: contain;
      border-radius: 5px;
      margin-bottom: 10px;
    }

    .page-b52code .game-card h3 {
      margin: 0;
      font-size: 1.1em;
      color: #ffcc00;
    }

    .page-b52code .features-list {
      list-style: none;
      padding: 0;
      margin-top: 20px;
      display: flex;
      flex-wrap: wrap;
      justify-content: center;
      gap: 15px;
    }

    .page-b52code .features-list li {
      background-color: #2c3e50;
      padding: 15px 20px;
      border-radius: 8px;
      flex: 1 1 calc(33% - 30px); /* 3 cột trên desktop */
      min-width: 280px; /* Đảm bảo đủ rộng trên mobile */
      text-align: left;
      box-shadow: 0 2px 5px rgba(0, 0, 0, 0.2);
    }

    .page-b52code .features-list li strong {
      color: #ffcc00;
    }

    .page-b52code .provider-logos {
      display: flex;
      flex-wrap: wrap;
      justify-content: center;
      gap: 20px;
      margin-top: 30px;
    }

    .page-b52code .provider-logos img {
      height: 50px;
      width: auto;
      object-fit: contain;
      filter: grayscale(80%) brightness(150%); /* Làm nổi bật logo trên nền tối */
      transition: filter 0.3s ease;
    }

    .page-b52code .provider-logos img:hover {
      filter: grayscale(0%) brightness(100%);
    }

    /* Responsive adjustments */
    @media (max-width: 768px) {
      .page-b52code h1 {
        font-size: 2em;
      }
      .page-b52code h2 {
        font-size: 1.7em;
      }
      .page-b52code h3 {
        font-size: 1.3em;
      }
      .page-b52code p {
        font-size: 1em;
      }
      .page-b52code .game-grid {
        grid-template-columns: repeat(auto-fit, minmax(120px, 1fr));
      }
      .page-b52code .features-list li {
        flex: 1 1 100%; /* 1 cột trên mobile */
      }
    }

    @media (max-width: 480px) {
      .page-b52code .floating-buttons a {
        font-size: 1em;
        padding: 10px 0;
      }
    }