/* CSS cho trang b52club */
    :root {
      --page-b52club-primary: #8B0000; /* Dark Red */
      --page-b52club-secondary: #FFD700; /* Gold */
      --page-b52club-accent: #008000; /* Green for success/promo */
      --page-b52club-dark: #1a1a1a; /* Dark background */
      --page-b52club-light: #f5f5f5; /* Light text/elements */
      --page-b52club-text-dark: #333;
      --page-b52club-text-light: #fff;
    }

    .page-b52club {
      font-family: 'Arial', sans-serif;
      color: var(--page-b52club-text-dark);
      background-color: var(--page-b52club-light);
      line-height: 1.6;
      overflow-x: hidden; /* Ngăn cuộn ngang từ các phần tử cố định */
    }

    .page-b52club-section {
      padding: 20px 15px;
      margin-bottom: 20px;
      background-color: #fff;
      border-radius: 8px;
      box-shadow: 0 2px 5px rgba(0,0,0,0.1);
    }

    .page-b52club-section-dark {
      background-color: var(--page-b52club-dark);
      color: var(--page-b52club-text-light);
      box-shadow: none;
      border-radius: 0;
      padding: 30px 15px;
    }

    .page-b52club-container {
      max-width: 1200px;
      margin: 0 auto;
      padding: 0 15px;
    }

    .page-b52club-header-banner {
      position: relative;
      width: 100%;
      height: 200px; /* Chiều cao cho di động */
      background-color: var(--page-b52club-dark);
      display: flex;
      flex-direction: column;
      justify-content: center;
      align-items: center;
      text-align: center;
      color: var(--page-b52club-text-light);
      overflow: hidden;
      margin-bottom: 20px;
      border-radius: 0 0 15px 15px;
    }

    .page-b52club-header-banner img {
      position: absolute;
      top: 0;
      left: 0;
      width: 100%;
      height: 100%;
      object-fit: cover;
      opacity: 0.4;
      z-index: 1;
    }

    .page-b52club-header-banner-content {
      position: relative;
      z-index: 2;
      padding: 15px;
    }

    .page-b52club-header-banner h1 {
      font-size: 2.2em;
      margin-bottom: 10px;
      color: var(--page-b52club-secondary);
      text-shadow: 2px 2px 4px rgba(0,0,0,0.7);
    }

    .page-b52club-header-banner p {
      font-size: 1.1em;
      margin-bottom: 20px;
      color: var(--page-b52club-light);
      text-shadow: 1px 1px 3px rgba(0,0,0,0.5);
    }

    .page-b52club-btn {
      display: inline-block;
      background-color: var(--page-b52club-primary);
      color: var(--page-b52club-text-light);
      padding: 12px 25px;
      border-radius: 30px;
      text-decoration: none;
      font-weight: bold;
      transition: background-color 0.3s ease, transform 0.2s ease;
      box-shadow: 0 4px 6px rgba(0,0,0,0.2);
    }

    .page-b52club-btn:hover {
      background-color: #A52A2A; /* Đỏ sẫm hơn một chút */
      transform: translateY(-2px);
    }

    .page-b52club-btn-accent {
      background-color: var(--page-b52club-accent);
    }

    .page-b52club-btn-accent:hover {
      background-color: #009900;
    }

    .page-b52club-floating-btn {
      position: fixed;
      bottom: 20px;
      right: 20px;
      z-index: 1000;
      background-color: var(--page-b52club-accent);
      color: var(--page-b52club-text-light);
      padding: 15px 25px;
      border-radius: 50px;
      text-decoration: none;
      font-weight: bold;
      box-shadow: 0 5px 15px rgba(0,0,0,0.3);
      animation: page-b52club-pulse 2s infinite;
      display: flex;
      align-items: center;
      gap: 8px;
      transition: opacity 0.3s ease, transform 0.3s ease;
    }

    .page-b52club-floating-btn:hover {
      background-color: #009900;
      transform: translateY(-2px);
    }

    @keyframes page-b52club-pulse {
      0% { transform: scale(1); }
      50% { transform: scale(1.05); }
      100% { transform: scale(1); }
    }

    .page-b52club-title {
      font-size: 1.8em;
      color: var(--page-b52club-primary);
      text-align: center;
      margin-bottom: 25px;
      position: relative;
      padding-bottom: 10px;
    }

    .page-b52club-title::after {
      content: '';
      position: absolute;
      left: 50%;
      bottom: 0;
      transform: translateX(-50%);
      width: 60px;
      height: 3px;
      background-color: var(--page-b52club-secondary);
      border-radius: 2px;
    }

    .page-b52club-subtitle {
      font-size: 1.4em;
      color: var(--page-b52club-primary);
      margin-bottom: 15px;
      text-align: center;
    }

    .page-b52club-text-center {
      text-align: center;
    }

    .page-b52club-grid {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
      gap: 20px;
      margin-top: 20px;
    }

    .page-b52club-game-card {
      background-color: #fff;
      border-radius: 8px;
      box-shadow: 0 2px 8px rgba(0,0,0,0.15);
      text-align: center;
      padding: 15px;
      transition: transform 0.3s ease, box-shadow 0.3s ease;
      overflow: hidden;
      display: flex;
      flex-direction: column;
      justify-content: space-between;
      height: 100%;
    }

    .page-b52club-game-card:hover {
      transform: translateY(-5px);
      box-shadow: 0 5px 15px rgba(0,0,0,0.2);
    }

    .page-b52club-game-card img {
      max-width: 100%;
      height: 100px; /* Chiều cao cố định để nhất quán */
      object-fit: contain; /* Đảm bảo hình ảnh hiển thị đầy đủ */
      border-radius: 5px;
      margin-bottom: 10px;
    }

    .page-b52club-game-card h3 {
      font-size: 1.1em;
      color: var(--page-b52club-primary);
      margin-bottom: 10px;
      flex-grow: 1;
    }

    .page-b52club-game-card a {
      text-decoration: none;
      color: var(--page-b52club-primary);
      font-weight: bold;
    }

    .page-b52club-game-card a:hover {
      color: var(--page-b52club-accent);
    }

    .page-b52club-list {
      list-style: none;
      padding: 0;
      margin: 0;
    }

    .page-b52club-list li {
      background-color: #f9f9f9;
      margin-bottom: 10px;
      padding: 12px 15px;
      border-left: 5px solid var(--page-b52club-secondary);
      border-radius: 5px;
      display: flex;
      align-items: center;
      gap: 10px;
    }

    .page-b52club-list li strong {
      color: var(--page-b52club-primary);
    }

    .page-b52club-promo-card {
      background-color: var(--page-b52club-dark);
      color: var(--page-b52club-text-light);
      padding: 25px;
      border-radius: 10px;
      text-align: center;
      margin-bottom: 20px;
      box-shadow: 0 4px 10px rgba(0,0,0,0.3);
    }

    .page-b52club-promo-card h3 {
      color: var(--page-b52club-secondary);
      font-size: 1.6em;
      margin-bottom: 10px;
    }

    .page-b52club-promo-card p {
      font-size: 1.1em;
      margin-bottom: 20px;
    }

    .page-b52club-steps {
      display: flex;
      flex-direction: column;
      gap: 20px;
    }

    .page-b52club-step-item {
      display: flex;
      align-items: flex-start;
      gap: 15px;
      background-color: #fff;
      padding: 15px;
      border-radius: 8px;
      box-shadow: 0 2px 5px rgba(0,0,0,0.1);
    }

    .page-b52club-step-item .icon {
      font-size: 2em;
      color: var(--page-b52club-primary);
      flex-shrink: 0;
    }

    .page-b52club-step-item h4 {
      font-size: 1.2em;
      color: var(--page-b52club-primary);
      margin-top: 0;
      margin-bottom: 5px;
    }

    .page-b52club-payment-grid {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(80px, 1fr));
      gap: 15px;
      margin-top: 20px;
      text-align: center;
    }

    .page-b52club-payment-item {
      display: flex;
      flex-direction: column;
      align-items: center;
      justify-content: center;
      background-color: #f0f0f0;
      padding: 10px;
      border-radius: 8px;
      box-shadow: 0 1px 3px rgba(0,0,0,0.08);
      height: 80px;
    }

    .page-b52club-payment-item img {
      max-width: 60px;
      max-height: 40px;
      object-fit: contain;
      margin-bottom: 5px;
    }

    .page-b52club-payment-item span {
      font-size: 0.85em;
      color: var(--page-b52club-text-dark);
      font-weight: bold;
    }

    .page-b52club-faq-item {
      background-color: #f9f9f9;
      border-radius: 8px;
      margin-bottom: 10px;
      overflow: hidden;
    }

    .page-b52club-faq-question {
      display: block;
      width: 100%;
      background-color: var(--page-b52club-primary);
      color: var(--page-b52club-text-light);
      padding: 15px;
      text-align: left;
      border: none;
      cursor: pointer;
      font-size: 1.1em;
      font-weight: bold;
      position: relative;
      transition: background-color 0.3s ease;
      padding-right: 40px; /* Khoảng trống cho biểu tượng */
    }

    .page-b52club-faq-question:hover {
      background-color: #A52A2A;
    }

    .page-b52club-faq-question::after {
      content: '+';
      position: absolute;
      right: 15px;
      top: 50%;
      transform: translateY(-50%);
      font-size: 1.2em;
      transition: transform 0.3s ease;
    }

    .page-b52club-faq-question.active::after {
      content: '-';
      transform: translateY(-50%) rotate(180deg);
    }

    .page-b52club-faq-answer {
      padding: 0 15px;
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.3s ease-out, padding 0.3s ease-out;
      background-color: #fff;
      color: var(--page-b52club-text-dark);
    }

    .page-b52club-faq-answer.open {
      max-height: 200px; /* Điều chỉnh khi cần */
      padding: 15px;
      transition: max-height 0.5s ease-in, padding 0.5s ease-in;
    }

    /* Điều chỉnh responsive */
    @media (min-width: 768px) {
      .page-b52club-header-banner {
        height: 300px; /* Chiều cao cho máy tính */
      }

      .page-b52club-header-banner h1 {
        font-size: 3em;
      }

      .page-b52club-header-banner p {
        font-size: 1.3em;
      }

      .page-b52club-section {
        padding: 30px;
      }

      .page-b52club-title {
        font-size: 2.5em;
      }

      .page-b52club-grid {
        grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
      }

      .page-b52club-steps {
        flex-direction: row;
        justify-content: center;
        flex-wrap: wrap;
      }

      .page-b52club-step-item {
        flex: 1 1 calc(33% - 20px); /* Ba mục mỗi hàng */
        max-width: calc(33% - 20px);
      }

      .page-b52club-payment-grid {
        grid-template-columns: repeat(auto-fit, minmax(100px, 1fr));
      }
    }

    @media (min-width: 1024px) {
      .page-b52club-header-banner {
        height: 400px;
      }

      .page-b52club-header-banner h1 {
        font-size: 3.5em;
      }

      .page-b52club-step-item {
        flex: 1 1 calc(25% - 20px); /* Bốn mục mỗi hàng */
        max-width: calc(25% - 20px);
      }
    }