/* Tổng thể */
    .page-gemclub {
      font-family: 'Arial', sans-serif;
      color: #333;
      line-height: 1.6;
      background-color: #f8f8f8;
    }

    /* Tiêu đề chung */
    .page-gemclub h1, .page-gemclub h2, .page-gemclub h3 {
      color: #2c3e50;
      text-align: center;
      margin-bottom: 20px;
    }

    .page-gemclub h1 {
      font-size: 2.5em;
      padding-top: 10px; /* Clear fixed header */
    }

    .page-gemclub h2 {
      font-size: 2em;
      border-bottom: 2px solid #e74c3c;
      display: inline-block;
      padding-bottom: 5px;
      margin-top: 40px;
    }

    .page-gemclub h3 {
      font-size: 1.5em;
    }

    .page-gemclub p {
      margin-bottom: 15px;
      text-align: justify;
    }

    /* Phần Hero Banner */
    .page-gemclub__hero-section {
      position: relative;
      width: 100%;
      min-height: 350px;
      display: flex;
      align-items: center;
      justify-content: center;
      text-align: center;
      color: #fff;
      overflow: hidden;
      padding-top: 10px; /* Dành cho fixed header */
      box-sizing: border-box;
    }

    .page-gemclub__hero-background {
      position: absolute;
      top: 0;
      left: 0;
      width: 100%;
      height: 100%;
      object-fit: cover;
      z-index: 1;
    }

    .page-gemclub__hero-overlay {
      position: absolute;
      top: 0;
      left: 0;
      width: 100%;
      height: 100%;
      background: rgba(0, 0, 0, 0.5);
      z-index: 2;
    }

    .page-gemclub__hero-content {
      position: relative;
      z-index: 3;
      max-width: 900px;
      padding: 20px;
    }

    .page-gemclub__hero-title {
      font-size: 3em;
      margin-bottom: 15px;
      text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.7);
    }

    .page-gemclub__hero-description {
      font-size: 1.2em;
      margin-bottom: 30px;
      text-shadow: 1px 1px 2px rgba(0, 0, 0, 0.7);
    }

    .page-gemclub__call-to-action-button {
      display: inline-block;
      background-color: #e74c3c;
      color: #fff;
      padding: 15px 30px;
      border-radius: 5px;
      text-decoration: none;
      font-size: 1.1em;
      font-weight: bold;
      transition: background-color 0.3s ease;
      cursor: pointer;
      border: none;
    }

    .page-gemclub__call-to-action-button:hover {
      background-color: #c0392b;
    }

    /* Nút khuyến mãi nổi */
    .page-gemclub__floating-promo-button {
      position: fixed;
      bottom: 20px;
      right: 20px;
      background-color: #f39c12;
      color: #fff;
      padding: 15px 25px;
      border-radius: 50px;
      font-size: 1.1em;
      font-weight: bold;
      text-align: center;
      box-shadow: 0 4px 8px rgba(0, 0, 0, 0.2);
      z-index: 1000;
      animation: page-gemclub__pulse 2s infinite;
      cursor: pointer;
      text-decoration: none; /* Ensure it looks like a button */
      white-space: nowrap; /* Keep text on one line */
    }

    .page-gemclub__floating-promo-button:hover {
      background-color: #e67e22;
      animation: none;
    }

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

    /* Phần nội dung chung */
    .page-gemclub__container {
      max-width: 1200px;
      margin: 0 auto;
      padding: 20px;
    }

    .page-gemclub__section {
      padding: 40px 0;
      background-color: #fff;
      margin-bottom: 20px;
      border-radius: 8px;
      box-shadow: 0 2px 4px rgba(0, 0, 0, 0.05);
    }

    /* Phần giới thiệu trò chơi */
    .page-gemclub__game-grid {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
      gap: 25px;
      margin-top: 30px;
      padding: 0 20px;
    }

    .page-gemclub__game-card {
      background-color: #fdfdfd;
      border-radius: 10px;
      overflow: hidden;
      box-shadow: 0 4px 10px rgba(0, 0, 0, 0.1);
      transition: transform 0.3s ease, box-shadow 0.3s ease;
      text-align: center;
      display: flex;
      flex-direction: column;
      box-sizing: border-box; /* Important for list items */
    }

    .page-gemclub__game-card:hover {
      transform: translateY(-5px);
      box-shadow: 0 6px 15px rgba(0, 0, 0, 0.15);
    }

    .page-gemclub__game-image {
      width: 100%;
      height: 200px;
      object-fit: cover;
      border-bottom: 1px solid #eee;
    }

    .page-gemclub__game-content {
      padding: 20px;
      flex-grow: 1;
      display: flex;
      flex-direction: column;
      justify-content: space-between;
    }

    .page-gemclub__game-title {
      font-size: 1.3em;
      margin-bottom: 10px;
      color: #333;
    }

    .page-gemclub__game-description {
      font-size: 0.95em;
      color: #666;
      margin-bottom: 15px;
      flex-grow: 1;
      text-align: left;
    }

    .page-gemclub__game-button {
      display: inline-block;
      background-color: #3498db;
      color: #fff;
      padding: 10px 20px;
      border-radius: 5px;
      text-decoration: none;
      font-size: 0.9em;
      transition: background-color 0.3s ease;
      cursor: pointer;
      border: none;
      margin-top: auto; /* Push button to bottom */
    }

    .page-gemclub__game-button:hover {
      background-color: #2980b9;
    }

    /* Phần khuyến mãi */
    .page-gemclub__promotion-grid {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
      gap: 25px;
      margin-top: 30px;
      padding: 0 20px;
    }

    .page-gemclub__promotion-card {
      background-color: #fdfdfd;
      border-radius: 10px;
      overflow: hidden;
      box-shadow: 0 4px 10px rgba(0, 0, 0, 0.1);
      transition: transform 0.3s ease, box-shadow 0.3s ease;
      text-align: center;
      box-sizing: border-box; /* Important for list items */
    }

    .page-gemclub__promotion-card:hover {
      transform: translateY(-5px);
      box-shadow: 0 6px 15px rgba(0, 0, 0, 0.15);
    }

    .page-gemclub__promotion-image {
      width: 100%;
      height: 220px;
      object-fit: cover;
      border-bottom: 1px solid #eee;
    }

    .page-gemclub__promotion-content {
      padding: 20px;
    }

    .page-gemclub__promotion-title {
      font-size: 1.4em;
      margin-bottom: 10px;
      color: #e74c3c;
    }

    .page-gemclub__promotion-description {
      font-size: 0.95em;
      color: #666;
      margin-bottom: 15px;
      text-align: left;
    }

    /* Phần tại sao chọn Gem Club */
    .page-gemclub__features-grid {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
      gap: 20px;
      margin-top: 30px;
      padding: 0 20px;
    }

    .page-gemclub__feature-item {
      background-color: #ecf0f1;
      padding: 25px;
      border-radius: 8px;
      text-align: center;
      box-shadow: 0 2px 5px rgba(0, 0, 0, 0.08);
      box-sizing: border-box; /* Important for list items */
    }

    .page-gemclub__feature-icon {
      font-size: 3em;
      color: #27ae60;
      margin-bottom: 15px;
    }

    .page-gemclub__feature-title {
      font-size: 1.2em;
      color: #2c3e50;
      margin-bottom: 10px;
    }

    .page-gemclub__feature-description {
      font-size: 0.9em;
      color: #555;
    }

    /* Phần FAQ */
    .page-gemclub__faq-container {
      max-width: 900px;
      margin: 0 auto;
      padding: 20px;
    }

    .page-gemclub__faq-item {
      background-color: #fff;
      margin-bottom: 10px;
      border-radius: 8px;
      box-shadow: 0 2px 4px rgba(0, 0, 0, 0.05);
      overflow: hidden;
      box-sizing: border-box; /* Important for list items */
    }

    .page-gemclub__faq-question {
      display: flex;
      justify-content: space-between;
      align-items: center;
      padding: 15px 20px;
      background-color: #f4f4f4;
      cursor: pointer;
      user-select: none;
      border-bottom: 1px solid #eee;
    }

    .page-gemclub__faq-question h3 {
      margin: 0;
      font-size: 1.1em;
      color: #333;
      text-align: left;
      flex-grow: 1;
      pointer-events: none; /* Prevent h3 from blocking click event */
    }

    .page-gemclub__faq-toggle {
      font-size: 1.5em;
      font-weight: bold;
      color: #e74c3c;
      transition: transform 0.3s ease;
      pointer-events: none; /* Prevent toggle icon from blocking click event */
    }

    .page-gemclub__faq-item.active .page-gemclub__faq-toggle {
      transform: rotate(45deg); /* Change + to X or similar */
    }
    
    .page-gemclub__faq-item.active .page-gemclub__faq-toggle::before {
        content: "−"; /* Change + to - */
    }
    .page-gemclub__faq-item:not(.active) .page-gemclub__faq-toggle::before {
        content: "+"; /* Ensure + is shown when not active */
    }

    .page-gemclub__faq-answer {
      max-height: 0;
      overflow: hidden;
      padding: 0 15px; /* Initial padding */
      transition: max-height 0.4s cubic-bezier(0.4, 0, 0.2, 1), padding 0.4s ease, opacity 0.4s ease;
      opacity: 0;
      background-color: #fff;
    }

    .page-gemclub__faq-item.active .page-gemclub__faq-answer {
      max-height: 2000px !important; /* Sufficiently large */
      padding: 20px 15px !important; /* Expanded padding */
      opacity: 1;
    }

    /* Responsive Design */
    @media (max-width: 768px) {
      .page-gemclub__hero-title {
        font-size: 2.2em;
      }

      .page-gemclub__hero-description {
        font-size: 1em;
      }

      .page-gemclub h1 {
        font-size: 2em;
      }

      .page-gemclub h2 {
        font-size: 1.8em;
      }

      .page-gemclub__call-to-action-button,
      .page-gemclub__floating-promo-button {
        padding: 12px 20px;
        font-size: 1em;
      }

      .page-gemclub__floating-promo-button {
        bottom: 15px;
        right: 15px;
      }

      .page-gemclub__game-grid,
      .page-gemclub__promotion-grid,
      .page-gemclub__features-grid {
        grid-template-columns: 1fr;
        padding: 0 10px;
      }
      
      /* List item specific requirements for mobile */
      .page-gemclub__game-card,
      .page-gemclub__promotion-card,
      .page-gemclub__feature-item,
      .page-gemclub__faq-item {
        width: 100% !important;
        max-width: 100% !important;
        box-sizing: border-box !important;
        margin-left: 0 !important;
        margin-right: 0 !important;
        word-wrap: break-word !important;
        overflow-wrap: break-word !important;
        word-break: break-word !important;
      }

      .page-gemclub__game-grid,
      .page-gemclub__promotion-grid,
      .page-gemclub__features-grid {
        width: 100% !important;
        max-width: 100% !important;
        box-sizing: border-box !important;
        padding: 0 !important;
        margin-left: 0 !important;
        margin-right: 0 !important;
      }

      .page-gemclub__game-content,
      .page-gemclub__promotion-content,
      .page-gemclub__feature-item,
      .page-gemclub__faq-question,
      .page-gemclub__faq-answer {
        padding-left: 10px !important;
        padding-right: 10px !important;
      }
    }