/* Tổng quan */
    .page-123b {
      font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
      color: #333;
      line-height: 1.6;
      background-color: #f5f8fa;
      padding-bottom: 80px; /* Khoảng trống cho nút cố định */
    }

    .page-123b__container {
      max-width: 1200px;
      margin: 0 auto;
      padding: 0 15px;
      box-sizing: border-box;
    }

    /* Hero Section */
    .page-123b__hero-section {
      background: linear-gradient(135deg, #0f1c3f, #1a2a5c);
      color: #fff;
      text-align: center;
      padding: 10px 0 60px 0; /* padding-top để tránh header cố định */
      position: relative;
      overflow: hidden;
      border-radius: 0 0 20px 20px;
    }

    .page-123b__hero-banner {
      width: 100%;
      max-width: 100%;
      height: auto;
      display: block;
      margin-bottom: 20px;
      border-radius: 10px;
      box-shadow: 0 8px 20px rgba(0, 0, 0, 0.3);
      object-fit: cover;
    }

    .page-123b__hero-title {
      font-size: 2.8em;
      margin-bottom: 15px;
      font-weight: 700;
      text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.4);
      padding: 0 10px;
      word-wrap: break-word;
      overflow-wrap: break-word;
    }

    .page-123b__hero-subtitle {
      font-size: 1.3em;
      margin-bottom: 30px;
      font-weight: 300;
      padding: 0 15px;
      word-wrap: break-word;
      overflow-wrap: break-word;
    }

    .page-123b__cta-button {
      display: inline-block;
      background-color: #ffcc00;
      color: #333;
      padding: 15px 35px;
      border-radius: 50px;
      font-size: 1.2em;
      font-weight: 600;
      text-decoration: none;
      transition: all 0.3s ease;
      box-shadow: 0 4px 15px rgba(255, 204, 0, 0.4);
      border: none;
      cursor: pointer;
    }

    .page-123b__cta-button:hover {
      background-color: #e6b800;
      transform: translateY(-3px);
      box-shadow: 0 6px 20px rgba(255, 204, 0, 0.6);
    }

    /* Floating Login Button */
    .page-123b__floating-login-button {
      position: fixed;
      bottom: 20px;
      left: 50%;
      transform: translateX(-50%);
      background-color: #e74c3c;
      color: #fff;
      padding: 15px 30px;
      border-radius: 50px;
      font-size: 1.1em;
      font-weight: 700;
      text-align: center;
      box-shadow: 0 5px 15px rgba(0, 0, 0, 0.3);
      z-index: 1000;
      transition: all 0.3s ease;
      border: none;
      cursor: pointer;
      white-space: nowrap;
      max-width: 90%; /* Đảm bảo không tràn màn hình */
      box-sizing: border-box;
    }

    .page-123b__floating-login-button:hover {
      background-color: #c0392b;
      transform: translateX(-50%) translateY(-3px);
      box-shadow: 0 8px 20px rgba(0, 0, 0, 0.4);
    }

    /* General Section Styles */
    .page-123b__section {
      padding: 40px 0;
      background-color: #fff;
      margin-top: 25px;
      border-radius: 10px;
      box-shadow: 0 2px 10px rgba(0, 0, 0, 0.05);
    }

    .page-123b__section:nth-of-type(even) {
      background-color: #fdfdfd;
    }

    .page-123b__section-title {
      font-size: 2.2em;
      color: #0f1c3f;
      text-align: center;
      margin-bottom: 30px;
      font-weight: 700;
      position: relative;
      padding-bottom: 10px;
    }

    .page-123b__section-title::after {
      content: '';
      position: absolute;
      left: 50%;
      bottom: 0;
      transform: translateX(-50%);
      width: 80px;
      height: 4px;
      background-color: #ffcc00;
      border-radius: 2px;
    }

    .page-123b__content-text {
      font-size: 1.1em;
      margin-bottom: 20px;
      text-align: justify;
      color: #555;
    }

    /* Game Grid */
    .page-123b__game-grid {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
      gap: 25px;
    }

    .page-123b__game-item {
      background-color: #fdfdfd;
      border-radius: 10px;
      box-shadow: 0 4px 15px rgba(0, 0, 0, 0.1);
      overflow: hidden;
      text-align: center;
      transition: transform 0.3s ease, box-shadow 0.3s ease;
      display: flex;
      flex-direction: column;
    }

    .page-123b__game-item:hover {
      transform: translateY(-5px);
      box-shadow: 0 8px 25px rgba(0, 0, 0, 0.15);
    }

    .page-123b__game-image {
      width: 100%;
      height: 180px;
      object-fit: cover;
      display: block;
      border-bottom: 3px solid #ffcc00;
    }

    .page-123b__game-title {
      font-size: 1.4em;
      color: #0f1c3f;
      margin: 15px 10px 10px 10px;
      font-weight: 600;
      word-wrap: break-word;
      overflow-wrap: break-word;
    }

    .page-123b__game-description {
      font-size: 0.95em;
      color: #666;
      padding: 0 15px 15px 15px;
      flex-grow: 1;
      text-align: justify;
    }

    /* App Download Section */
    .page-123b__app-download-content {
      display: flex;
      flex-direction: column;
      align-items: center;
      text-align: center;
    }

    .page-123b__app-qr-code {
      width: 200px;
      height: 200px;
      margin-top: 20px;
      border: 5px solid #ffcc00;
      border-radius: 10px;
      box-shadow: 0 4px 15px rgba(0, 0, 0, 0.1);
    }

    .page-123b__app-instructions {
      list-style: none;
      padding: 0;
      margin-top: 30px;
      width: 100%;
      max-width: 600px;
    }

    .page-123b__app-instructions-item {
      background-color: #f8f8f8;
      margin-bottom: 15px;
      padding: 15px 20px;
      border-left: 5px solid #0f1c3f;
      border-radius: 8px;
      text-align: left;
      font-size: 1.1em;
      color: #444;
      box-shadow: 0 2px 8px rgba(0, 0, 0, 0.08);
      box-sizing: border-box;
      word-wrap: break-word;
      overflow-wrap: break-word;
    }

    .page-123b__app-instructions-item strong {
      color: #0f1c3f;
    }

    /* Promotions Section */
    .page-123b__promo-grid {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
      gap: 25px;
    }

    .page-123b__promo-card {
      background-color: #fdfdfd;
      border-radius: 10px;
      box-shadow: 0 4px 15px rgba(0, 0, 0, 0.1);
      overflow: hidden;
      transition: transform 0.3s ease, box-shadow 0.3s ease;
      display: flex;
      flex-direction: column;
      text-align: center;
    }

    .page-123b__promo-card:hover {
      transform: translateY(-5px);
      box-shadow: 0 8px 25px rgba(0, 0, 0, 0.15);
    }

    .page-123b__promo-image {
      width: 100%;
      height: 200px;
      object-fit: cover;
      display: block;
      border-bottom: 3px solid #e74c3c;
    }

    .page-123b__promo-title {
      font-size: 1.5em;
      color: #0f1c3f;
      margin: 15px 10px 10px 10px;
      font-weight: 600;
      word-wrap: break-word;
      overflow-wrap: break-word;
    }

    .page-123b__promo-description {
      font-size: 0.95em;
      color: #666;
      padding: 0 15px 15px 15px;
      flex-grow: 1;
      text-align: justify;
    }

    /* FAQ Section */
    .page-123b__faq-section {
      padding: 40px 0;
      background-color: #fff;
      margin-top: 25px;
      border-radius: 10px;
      box-shadow: 0 2px 10px rgba(0, 0, 0, 0.05);
    }

    .page-123b__faq-item {
      background-color: #f8f8f8;
      border: 1px solid #eee;
      border-radius: 8px;
      margin-bottom: 10px;
      overflow: hidden;
      box-shadow: 0 2px 5px rgba(0,0,0,0.05);
    }

    .page-123b__faq-question {
      display: flex;
      justify-content: space-between;
      align-items: center;
      padding: 15px 20px;
      background-color: #0f1c3f;
      color: #fff;
      cursor: pointer;
      font-weight: 600;
      font-size: 1.1em;
      user-select: none;
      transition: background-color 0.3s ease;
      border-radius: 8px 8px 0 0;
    }

    .page-123b__faq-question:hover {
      background-color: #1a2a5c;
    }

    .page-123b__faq-question h3 {
      margin: 0;
      font-size: 1.1em;
      color: #fff;
      flex-grow: 1;
      text-align: left;
      pointer-events: none; /* Prevent h3 from blocking click */
      word-wrap: break-word;
      overflow-wrap: break-word;
    }

    .page-123b__faq-toggle {
      font-size: 1.5em;
      line-height: 1;
      margin-left: 15px;
      transition: transform 0.3s ease;
      pointer-events: none; /* Prevent toggle icon from blocking click */
    }

    .page-123b__faq-answer {
      max-height: 0;
      overflow: hidden;
      padding: 0 20px;
      background-color: #fff;
      color: #444;
      transition: max-height 0.4s cubic-bezier(0.4, 0, 0.2, 1), padding 0.4s ease, opacity 0.4s ease;
      opacity: 0;
      font-size: 1em;
      text-align: justify;
    }

    .page-123b__faq-item.active .page-123b__faq-answer {
      max-height: 2000px !important; /* Sufficiently large to contain content */
      padding: 20px 20px !important;
      opacity: 1;
    }

    .page-123b__faq-item.active .page-123b__faq-toggle {
      transform: rotate(45deg); /* Change '+' to 'x' visually */
    }

    /* Responsive Design */
    @media (max-width: 768px) {
      .page-123b__hero-title {
        font-size: 2em;
      }

      .page-123b__hero-subtitle {
        font-size: 1em;
      }

      .page-123b__cta-button {
        padding: 12px 25px;
        font-size: 1em;
      }

      .page-123b__section-title {
        font-size: 1.8em;
      }

      .page-123b__game-grid,
      .page-123b__promo-grid {
        grid-template-columns: 1fr;
      }

      .page-123b__app-instructions-item,
      .page-123b__faq-item,
      .page-123b__faq-answer,
      .page-123b__faq-question {
        width: 100% !important;
        max-width: 100% !important;
        box-sizing: border-box !important;
        padding-left: 15px !important;
        padding-right: 15px !important;
        margin-left: 0 !important;
        margin-right: 0 !important;
      }
      .page-123b__app-instructions {
          padding: 0 15px !important;
          margin-left: 0 !important;
          margin-right: 0 !important;
          width: 100% !important;
          max-width: 100% !important;
          box-sizing: border-box !important;
      }

      .page-123b__floating-login-button {
        font-size: 1em;
        padding: 12px 20px;
        bottom: 15px;
      }
      
      .page-123b__hero-section {
        padding-top: 10px; /* Adjust padding for mobile fixed header */
      }
    }

    @media (max-width: 480px) {
      .page-123b__hero-title {
        font-size: 1.6em;
      }
      .page-123b__hero-subtitle {
        font-size: 0.9em;
      }
      .page-123b__floating-login-button {
        font-size: 0.9em;
        padding: 10px 15px;
      }
    }