/* CSS cho trang 123b */
    .page-123b {
      font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
      line-height: 1.6;
      color: #e0e0e0; /* Màu chữ sáng */
      background-color: #1a1a2e; /* Nền tối */
      padding: 20px 0;
      display: flex;
      flex-direction: column;
      align-items: center;
    }

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

    .page-123b .section {
      background-color: #2a2a4a; /* Nền phần tối hơn */
      margin-bottom: 30px;
      padding: 30px;
      border-radius: 10px;
      box-shadow: 0 5px 15px rgba(0, 0, 0, 0.3);
      width: 100%;
    }

    .page-123b .hero-section {
      text-align: center;
      padding: 60px 20px;
      background: linear-gradient(45deg, #1a1a2e, #3a3a5a);
      border-radius: 10px;
      margin-bottom: 40px;
    }

    .page-123b .hero-section h1 {
      font-size: 2.8em;
      color: #e94560; /* Màu nhấn */
      margin-bottom: 15px;
      text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.5);
    }

    .page-123b .hero-section p {
      font-size: 1.2em;
      color: #cccccc;
      max-width: 800px;
      margin: 0 auto 30px auto;
    }

    .page-123b .btn-primary {
      display: inline-block;
      background-color: #e94560; /* Màu nhấn */
      color: #ffffff;
      padding: 15px 30px;
      border-radius: 8px;
      text-decoration: none;
      font-weight: bold;
      font-size: 1.1em;
      transition: background-color 0.3s ease, transform 0.2s ease;
      border: none;
      cursor: pointer;
    }

    .page-123b .btn-primary:hover {
      background-color: #c93450;
      transform: translateY(-2px);
    }

    .page-123b h2 {
      font-size: 2em;
      color: #e94560;
      margin-bottom: 25px;
      text-align: center;
      border-bottom: 2px solid #e94560;
      padding-bottom: 10px;
      display: table; /* Để border-bottom chỉ rộng bằng chữ */
      margin-left: auto;
      margin-right: auto;
    }

    .page-123b h3 {
      font-size: 1.5em;
      color: #4CAF50; /* Màu xanh lá cây */
      margin-top: 30px;
      margin-bottom: 15px;
    }

    .page-123b .usp-grid {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
      gap: 25px;
      margin-top: 30px;
    }

    .page-123b .usp-item {
      background-color: #3a3a5a;
      padding: 25px;
      border-radius: 8px;
      text-align: center;
      box-shadow: 0 4px 10px rgba(0, 0, 0, 0.2);
    }

    .page-123b .usp-item img {
      width: 80px;
      height: 80px;
      margin-bottom: 15px;
      object-fit: cover;
      border-radius: 50%;
      border: 3px solid #e94560;
    }

    .page-123b .usp-item h4 {
      color: #e94560;
      font-size: 1.3em;
      margin-bottom: 10px;
    }

    .page-123b .usp-item p {
      color: #cccccc;
    }

    .page-123b .game-list {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
      gap: 20px;
      margin-top: 20px;
    }

    .page-123b .game-item {
      background-color: #3a3a5a;
      padding: 15px;
      border-radius: 8px;
      text-align: center;
      box-shadow: 0 4px 8px rgba(0, 0, 0, 0.2);
      transition: transform 0.2s ease;
    }

    .page-123b .game-item:hover {
      transform: translateY(-5px);
    }

    .page-123b .game-item img {
      width: 100%;
      height: 120px;
      object-fit: cover;
      border-radius: 5px;
      margin-bottom: 10px;
    }

    .page-123b .game-item h4 {
      color: #4CAF50;
      font-size: 1.1em;
      margin-bottom: 10px;
    }

    .page-123b .game-item a {
      color: #e94560;
      text-decoration: none;
      font-weight: bold;
      transition: color 0.2s ease;
    }

    .page-123b .game-item a:hover {
      color: #c93450;
    }

    .page-123b .guide-steps {
      list-style: none;
      padding: 0;
      margin-top: 20px;
    }

    .page-123b .guide-steps li {
      background-color: #3a3a5a;
      margin-bottom: 15px;
      padding: 20px;
      border-radius: 8px;
      display: flex;
      align-items: flex-start;
      box-shadow: 0 4px 8px rgba(0, 0, 0, 0.2);
    }

    .page-123b .guide-steps li span {
      font-size: 1.8em;
      font-weight: bold;
      color: #e94560;
      margin-right: 15px;
      flex-shrink: 0;
    }

    .page-123b .guide-steps li p {
      margin: 0;
      color: #cccccc;
    }

    .page-123b .promo-banner {
      background-color: #4CAF50;
      color: #ffffff;
      padding: 25px;
      border-radius: 10px;
      text-align: center;
      margin-top: 30px;
      box-shadow: 0 5px 15px rgba(0, 0, 0, 0.3);
    }

    .page-123b .promo-banner h3 {
      color: #ffffff;
      font-size: 1.8em;
      margin-bottom: 10px;
    }

    .page-123b .promo-banner p {
      font-size: 1.1em;
      margin-bottom: 20px;
    }

    .page-123b .faq-item {
      margin-bottom: 15px;
      border-bottom: 1px solid #3a3a5a;
      padding-bottom: 15px;
    }

    .page-123b .faq-question {
      font-weight: bold;
      color: #4CAF50;
      cursor: pointer;
      display: flex;
      justify-content: space-between;
      align-items: center;
      padding: 10px 0;
    }

    .page-123b .faq-question::after {
      content: '+';
      font-size: 1.2em;
      transition: transform 0.3s ease;
    }

    .page-123b .faq-question.active::after {
      content: '-';
      transform: rotate(180deg);
    }

    .page-123b .faq-answer {
      color: #cccccc;
      padding: 10px 0;
      display: none;
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.3s ease-out;
    }

    .page-123b .faq-answer.open {
      display: block;
      max-height: 200px; /* Adjust as needed */
    }

    .page-123b .cta-section {
      text-align: center;
      padding: 40px 20px;
      background-color: #1a1a2e;
      border-radius: 10px;
      margin-top: 40px;
    }

    .page-123b .cta-section h2 {
      color: #e94560;
      margin-bottom: 20px;
    }

    .page-123b .cta-section p {
      font-size: 1.1em;
      margin-bottom: 30px;
      color: #cccccc;
    }

    .page-123b .floating-ad {
      position: fixed;
      bottom: 20px;
      right: 20px;
      background-color: #e94560;
      color: #ffffff;
      padding: 15px 20px;
      border-radius: 10px;
      box-shadow: 0 4px 15px rgba(0, 0, 0, 0.4);
      z-index: 1000;
      display: flex;
      align-items: center;
      gap: 10px;
      animation: pulse 2s infinite;
    }

    .page-123b .floating-ad a {
      color: #ffffff;
      text-decoration: none;
      font-weight: bold;
      font-size: 1.1em;
    }

    .page-123b .floating-ad img {
      width: 40px;
      height: 40px;
      object-fit: contain;
    }

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

    /* Responsive adjustments */
    @media (max-width: 768px) {
      .page-123b .hero-section h1 {
        font-size: 2em;
      }
      .page-123b .hero-section p {
        font-size: 1em;
      }
      .page-123b .btn-primary {
        padding: 12px 25px;
        font-size: 1em;
      }
      .page-123b h2 {
        font-size: 1.8em;
      }
      .page-123b .usp-grid, .page-123b .game-list {
        grid-template-columns: 1fr;
      }
      .page-123b .guide-steps li {
        flex-direction: column;
        text-align: center;
      }
      .page-123b .guide-steps li span {
        margin-right: 0;
        margin-bottom: 10px;
      }
      .page-123b .floating-ad {
        bottom: 10px;
        right: 10px;
        padding: 10px 15px;
        font-size: 0.9em;
      }
    }