:root {
      --page-go99-primary-color: #e44d26; /* Cam đỏ */
      --page-go99-secondary-color: #ff9800; /* Cam sáng */
      --page-go99-accent-color: #4caf50; /* Xanh lá */
      --page-go99-text-color: #333;
      --page-go99-light-text-color: #f8f8f8;
      --page-go99-bg-color: #f0f2f5;
      --page-go99-dark-bg-color: #2c3e50; /* Xám xanh đậm */
      --page-go99-card-bg: #ffffff;
      --page-go99-border-radius: 8px;
      --page-go99-box-shadow: 0 4px 15px rgba(0, 0, 0, 0.1);
    }

    .page-go99 {
      font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
      line-height: 1.6;
      color: var(--page-go99-text-color);
      background-color: var(--page-go99-bg-color);
      display: flex;
      flex-direction: column;
      align-items: center;
      padding: 0;
      overflow-x: hidden;
    }

    .page-go99__section {
      width: 100%;
      max-width: 1200px;
      padding: 40px 20px;
      margin-bottom: 20px;
      background-color: var(--page-go99-card-bg);
      border-radius: var(--page-go99-border-radius);
      box-shadow: var(--page-go99-box-shadow);
      box-sizing: border-box;
    }

    .page-go99__section--dark {
      background-color: var(--page-go99-dark-bg-color);
      color: var(--page-go99-light-text-color);
    }

    .page-go99__section-title {
      text-align: center;
      color: var(--page-go99-primary-color);
      margin-bottom: 30px;
      font-size: 2.5em;
      font-weight: bold;
    }

    .page-go99__section-title--light {
      color: var(--page-go99-secondary-color);
    }

    .page-go99__text-center {
      text-align: center;
    }

    /* Hero Section */
    .page-go99__hero-section {
      background: linear-gradient(135deg, var(--page-go99-primary-color), var(--page-go99-secondary-color));
      color: var(--page-go99-light-text-color);
      text-align: center;
      padding: 10px 20px 60px 20px; /* Adjusted padding-top for fixed header */
      position: relative;
      overflow: hidden;
      margin-bottom: 20px;
      box-shadow: var(--page-go99-box-shadow);
      box-sizing: border-box;
    }

    .page-go99__hero-image-container {
      width: 100%;
      max-width: 100%;
      overflow: hidden;
      margin-bottom: 20px;
      border-radius: var(--page-go99-border-radius);
      box-sizing: border-box;
    }

    .page-go99__hero-image {
      width: 100%;
      height: auto;
      display: block;
      border-radius: var(--page-go99-border-radius);
      object-fit: cover;
      min-height: 200px; /* Minimum size requirement */
      min-width: 200px; /* Minimum size requirement */
    }

    .page-go99__hero-title {
      font-size: 3em;
      margin-bottom: 15px;
      font-weight: 900;
      line-height: 1.2;
      color: var(--page-go99-light-text-color);
    }

    .page-go99__hero-subtitle {
      font-size: 1.5em;
      margin-bottom: 30px;
      font-weight: 300;
      color: var(--page-go99-light-text-color);
    }

    .page-go99__promotion-button {
      display: inline-block;
      background-color: var(--page-go99-accent-color);
      color: var(--page-go99-light-text-color);
      padding: 15px 30px;
      border-radius: 50px;
      text-decoration: none;
      font-weight: bold;
      font-size: 1.2em;
      transition: background-color 0.3s ease, transform 0.2s ease;
      border: none;
      cursor: pointer;
      box-shadow: 0 5px 15px rgba(0, 0, 0, 0.2);
    }

    .page-go99__promotion-button:hover {
      background-color: #388e3c;
      transform: translateY(-3px);
    }

    /* Floating Login Button */
    .page-go99__floating-login {
      position: fixed;
      bottom: 20px;
      right: 20px;
      z-index: 1000;
      animation: page-go99__pulse 2s infinite;
    }

    @keyframes page-go99__pulse {
      0% { transform: scale(1); box-shadow: 0 0 0 0 rgba(255, 152, 0, 0.7); }
      70% { transform: scale(1.05); box-shadow: 0 0 0 20px rgba(255, 152, 0, 0); }
      100% { transform: scale(1); box-shadow: 0 0 0 0 rgba(255, 152, 0, 0); }
    }

    .page-go99__floating-login .page-go99__promotion-button {
      padding: 12px 25px;
      font-size: 1.1em;
      background-color: var(--page-go99-secondary-color);
      color: var(--page-go99-dark-bg-color);
      box-shadow: 0 5px 15px rgba(0, 0, 0, 0.3);
    }

    .page-go99__floating-login .page-go99__promotion-button:hover {
      background-color: #f57c00;
      color: var(--page-go99-light-text-color);
    }

    /* Game Categories */
    .page-go99__game-grid {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
      gap: 25px;
      padding: 0;
      list-style: none;
      justify-content: center;
    }

    .page-go99__game-card {
      background-color: var(--page-go99-card-bg);
      border-radius: var(--page-go99-border-radius);
      box-shadow: var(--page-go99-box-shadow);
      overflow: hidden;
      text-align: center;
      transition: transform 0.3s ease, box-shadow 0.3s ease;
      box-sizing: border-box;
      display: flex;
      flex-direction: column;
      align-items: center;
      padding-bottom: 20px;
    }

    .page-go99__game-card:hover {
      transform: translateY(-5px);
      box-shadow: 0 8px 25px rgba(0, 0, 0, 0.15);
    }

    .page-go99__game-card-image-container {
      width: 100%;
      height: 200px;
      overflow: hidden;
      margin-bottom: 15px;
      box-sizing: border-box;
    }

    .page-go99__game-card-image {
      width: 100%;
      height: 100%;
      object-fit: cover;
      display: block;
      min-height: 200px; /* Minimum size requirement */
      min-width: 200px; /* Minimum size requirement */
    }

    .page-go99__game-card-title {
      font-size: 1.5em;
      color: var(--page-go99-primary-color);
      margin-bottom: 10px;
      padding: 0 15px;
    }

    .page-go99__game-card-description {
      font-size: 0.95em;
      color: var(--page-go99-text-color);
      padding: 0 15px;
    }

    /* Why Choose Us / Features */
    .page-go99__features-list {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
      gap: 20px;
      list-style: none;
      padding: 0;
    }

    .page-go99__feature-item {
      background-color: var(--page-go99-card-bg);
      padding: 25px;
      border-radius: var(--page-go99-border-radius);
      box-shadow: var(--page-go99-box-shadow);
      text-align: center;
      transition: transform 0.3s ease;
      box-sizing: border-box;
    }

    .page-go99__feature-item:hover {
      transform: translateY(-5px);
    }

    .page-go99__feature-icon {
      width: 80px;
      height: 80px;
      margin-bottom: 15px;
      display: inline-block;
      min-height: 200px; /* Minimum size requirement */
      min-width: 200px; /* Minimum size requirement */
    }

    .page-go99__feature-title {
      font-size: 1.3em;
      color: var(--page-go99-primary-color);
      margin-bottom: 10px;
    }

    .page-go99__feature-description {
      font-size: 0.9em;
      color: var(--page-go99-text-color);
    }

    /* Call to Action */
    .page-go99__cta-section {
      background: linear-gradient(90deg, var(--page-go99-secondary-color), var(--page-go99-primary-color));
      color: var(--page-go99-light-text-color);
      text-align: center;
      padding: 60px 20px;
      border-radius: var(--page-go99-border-radius);
      box-shadow: var(--page-go99-box-shadow);
    }

    .page-go99__cta-title {
      font-size: 2.5em;
      margin-bottom: 20px;
      font-weight: bold;
    }

    .page-go99__cta-description {
      font-size: 1.2em;
      margin-bottom: 30px;
      max-width: 800px;
      margin-left: auto;
      margin-right: auto;
    }

    /* FAQ Section */
    .page-go99__faq-section {
      padding: 40px 20px;
      background-color: var(--page-go99-card-bg);
      border-radius: var(--page-go99-border-radius);
      box-shadow: var(--page-go99-box-shadow);
      margin-bottom: 20px;
      box-sizing: border-box;
    }

    .page-go99__faq-item {
      border-bottom: 1px solid #eee;
      margin-bottom: 10px;
      box-sizing: border-box;
    }

    .page-go99__faq-item:last-child {
      border-bottom: none;
      margin-bottom: 0;
    }

    .page-go99__faq-question {
      display: flex;
      justify-content: space-between;
      align-items: center;
      padding: 15px 0;
      cursor: pointer;
      user-select: none;
      font-size: 1.1em;
      font-weight: 600;
      color: var(--page-go99-text-color);
      transition: color 0.3s ease;
    }

    .page-go99__faq-question:hover {
      color: var(--page-go99-primary-color);
    }

    .page-go99__faq-question h3 {
      margin: 0;
      flex-grow: 1;
      pointer-events: none; /* Prevent h3 from blocking click on parent */
      font-size: 1.1em; /* Ensure consistent font size */
      color: inherit; /* Inherit color from parent */
    }

    .page-go99__faq-toggle {
      font-size: 1.5em;
      font-weight: bold;
      margin-left: 15px;
      color: var(--page-go99-primary-color);
      transition: transform 0.3s ease;
      pointer-events: none; /* Prevent toggle from blocking click on parent */
    }

    .page-go99__faq-item.active .page-go99__faq-toggle {
      transform: rotate(45deg); /* Change '+' to 'x' or similar effect */
    }

    .page-go99__faq-answer {
      max-height: 0;
      overflow: hidden;
      padding: 0 15px;
      opacity: 0;
      transition: max-height 0.4s cubic-bezier(0.4, 0, 0.2, 1), padding 0.4s ease, opacity 0.4s ease;
      color: var(--page-go99-text-color);
      box-sizing: border-box;
    }

    .page-go99__faq-item.active .page-go99__faq-answer {
      max-height: 2000px !important; /* Sufficiently large to contain content */
      padding: 20px 15px !important;
      opacity: 1;
    }

    /* Responsive Design */
    @media (max-width: 768px) {
      .page-go99__hero-section {
        padding-top: 10px; /* Maintain padding for fixed header on mobile */
      }

      .page-go99__hero-title {
        font-size: 2.2em;
      }

      .page-go99__hero-subtitle {
        font-size: 1.2em;
      }

      .page-go99__promotion-button {
        padding: 12px 25px;
        font-size: 1em;
      }

      .page-go99__section {
        padding: 30px 15px;
      }

      .page-go99__section-title {
        font-size: 2em;
        margin-bottom: 20px;
      }

      .page-go99__game-grid,
      .page-go99__features-list {
        grid-template-columns: 1fr;
        gap: 20px;
      }

      .page-go99__game-card,
      .page-go99__feature-item {
        width: 100% !important;
        max-width: 100% !important;
        box-sizing: border-box !important;
        margin-left: 0 !important;
        margin-right: 0 !important;
      }

      .page-go99__game-card-image-container {
        height: 180px;
      }

      .page-go99__cta-title {
        font-size: 2em;
      }

      .page-go99__cta-description {
        font-size: 1em;
      }

      .page-go99__faq-question {
        font-size: 1em;
        padding: 12px 0;
      }
      .page-go99__faq-question h3 {
        font-size: 1em;
      }
      .page-go99__faq-answer {
        padding: 0 10px;
      }
      .page-go99__faq-item.active .page-go99__faq-answer {
        padding: 15px 10px !important;
      }

      /* Ensure list items and containers handle text wrapping */
      .page-go99__game-grid,
      .page-go99__features-list {
        width: 100% !important;
        max-width: 100% !important;
        padding: 0 !important;
        margin-left: 0 !important;
        margin-right: 0 !important;
        box-sizing: border-box !important;
      }

      .page-go99__game-card,
      .page-go99__feature-item,
      .page-go99__faq-item {
        word-wrap: break-word !important;
        overflow-wrap: break-word !important;
        word-break: break-word !important;
      }
      .page-go99__hero-image,
      .page-go99__game-card-image,
      .page-go99__feature-icon {
        max-width: 100% !important;
        height: auto !important;
        box-sizing: border-box !important;
      }
      .page-go99__hero-image-container,
      .page-go99__game-card-image-container {
        width: 100% !important;
        max-width: 100% !important;
        overflow: hidden !important;
        box-sizing: border-box !important;
      }
    }