:root {
      --page-go99-primary-color: #e44d26; /* Cam đỏ */
      --page-go99-secondary-color: #ff9900; /* Cam sáng */
      --page-go99-accent-color: #4CAF50; /* Xanh lá */
      --page-go99-text-color: #333333; /* Xám đậm */
      --page-go99-background-color: #f8f8f8; /* Ghi sáng */
      --page-go99-light-text-color: #ffffff; /* Trắng */
      --page-go99-dark-background: #2c3e50; /* Xám xanh đậm */
      --page-go99-border-color: #dddddd; /* Xám nhạt */
    }

    .page-go99 {
      font-family: 'Arial', sans-serif;
      line-height: 1.6;
      color: var(--page-go99-text-color);
      background-color: var(--page-go99-background-color);
    }

    .page-go99__container {
      max-width: 1200px;
      margin: 0 auto;
      padding: 20px;
      box-sizing: border-box;
    }

    .page-go99__section {
      background-color: var(--page-go99-light-text-color);
      margin-bottom: 30px;
      padding: 30px 20px;
      border-radius: 8px;
      box-shadow: 0 4px 8px rgba(0, 0, 0, 0.1);
      overflow: hidden;
    }

    .page-go99__section-title {
      font-size: 2.5em;
      color: var(--page-go99-primary-color);
      text-align: center;
      margin-bottom: 25px;
      position: relative;
      padding-bottom: 10px;
    }

    .page-go99__section-title::after {
      content: '';
      position: absolute;
      left: 50%;
      bottom: 0;
      transform: translateX(-50%);
      width: 80px;
      height: 4px;
      background-color: var(--page-go99-secondary-color);
      border-radius: 2px;
    }

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

    /* Hero Section */
    .page-go99__hero-section {
      position: relative;
      width: 100%;
      background-color: var(--page-go99-dark-background);
      color: var(--page-go99-light-text-color);
      padding-top: 80px; /* Adjust for fixed header */
      padding-bottom: 50px;
      text-align: center;
      overflow: hidden;
    }

    .page-go99__hero-image {
      width: 100%;
      height: 400px;
      object-fit: cover;
      position: absolute;
      top: 0;
      left: 0;
      opacity: 0.4;
      z-index: 1;
    }

    .page-go99__hero-content {
      position: relative;
      z-index: 2;
      padding: 20px;
      max-width: 800px;
      margin: 0 auto;
    }

    .page-go99__hero-title {
      font-size: 3.5em;
      margin-bottom: 15px;
      color: var(--page-go99-secondary-color);
      text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.5);
    }

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

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

    .page-go99__promo-button {
      display: block;
      background: linear-gradient(45deg, var(--page-go99-primary-color), var(--page-go99-secondary-color));
      color: var(--page-go99-light-text-color);
      padding: 15px 25px;
      border-radius: 50px;
      text-decoration: none;
      font-weight: bold;
      font-size: 1.2em;
      box-shadow: 0 5px 15px rgba(0, 0, 0, 0.3);
      transition: transform 0.3s ease, box-shadow 0.3s ease;
      text-align: center;
    }

    .page-go99__promo-button:hover {
      transform: translateY(-3px) scale(1.02);
      box-shadow: 0 8px 20px rgba(0, 0, 0, 0.4);
    }

    @keyframes page-go99__pulse {
      0% {
        transform: scale(1);
      }
      50% {
        transform: scale(1.05);
      }
      100% {
        transform: scale(1);
      }
    }

    /* Game List */
    .page-go99__game-grid {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
      gap: 25px;
      margin-top: 30px;
    }

    .page-go99__game-item {
      background-color: #fefefe;
      border-radius: 10px;
      overflow: hidden;
      box-shadow: 0 6px 15px rgba(0, 0, 0, 0.1);
      transition: transform 0.3s ease, box-shadow 0.3s ease;
      display: flex;
      flex-direction: column;
    }

    .page-go99__game-item:hover {
      transform: translateY(-8px);
      box-shadow: 0 12px 25px rgba(0, 0, 0, 0.2);
    }

    .page-go99__game-image {
      width: 100%;
      height: 200px;
      object-fit: cover;
      border-bottom: 2px solid var(--page-go99-primary-color);
    }

    .page-go99__game-content {
      padding: 20px;
      flex-grow: 1;
      display: flex;
      flex-direction: column;
      justify-content: space-between;
    }

    .page-go99__game-title {
      font-size: 1.8em;
      color: var(--page-go99-primary-color);
      margin-bottom: 10px;
      text-align: center;
    }

    .page-go99__game-description {
      font-size: 0.95em;
      color: var(--page-go99-text-color);
      margin-bottom: 15px;
      flex-grow: 1;
    }

    .page-go99__game-link {
      display: block;
      text-align: center;
      background-color: var(--page-go99-accent-color);
      color: var(--page-go99-light-text-color);
      padding: 10px 15px;
      border-radius: 5px;
      text-decoration: none;
      font-weight: bold;
      transition: background-color 0.3s ease;
      margin-top: auto; /* Push to bottom */
    }

    .page-go99__game-link:hover {
      background-color: #4CAF50; /* Slightly darker green */
    }

    /* Guide Steps */
    .page-go99__guide-steps {
      display: flex;
      flex-wrap: wrap;
      justify-content: center;
      gap: 30px;
      margin-top: 30px;
    }

    .page-go99__step-item {
      background-color: #fefefe;
      border: 1px solid var(--page-go99-border-color);
      border-radius: 10px;
      padding: 25px;
      text-align: center;
      flex: 1;
      min-width: 280px;
      max-width: 350px;
      box-shadow: 0 4px 10px rgba(0, 0, 0, 0.08);
      transition: transform 0.3s ease;
      box-sizing: border-box; /* Crucial for responsive width */
    }

    .page-go99__step-item:hover {
      transform: translateY(-5px);
    }

    .page-go99__step-icon {
      font-size: 3em;
      color: var(--page-go99-primary-color);
      margin-bottom: 15px;
    }

    .page-go99__step-title {
      font-size: 1.5em;
      color: var(--page-go99-secondary-color);
      margin-bottom: 10px;
    }

    .page-go99__step-description {
      font-size: 1em;
      color: var(--page-go99-text-color);
    }

    /* Promotions */
    .page-go99__promo-list {
      display: flex;
      flex-wrap: wrap;
      justify-content: center;
      gap: 25px;
      margin-top: 30px;
    }

    .page-go99__promo-card {
      background: linear-gradient(135deg, #fff, #f0f0f0);
      border-radius: 12px;
      box-shadow: 0 6px 18px rgba(0, 0, 0, 0.15);
      padding: 30px;
      flex: 1;
      min-width: 280px;
      max-width: 450px;
      text-align: center;
      transition: transform 0.3s ease, box-shadow 0.3s ease;
      box-sizing: border-box;
      border: 1px solid var(--page-go99-secondary-color);
    }

    .page-go99__promo-card:hover {
      transform: translateY(-10px);
      box-shadow: 0 10px 25px rgba(0, 0, 0, 0.2);
    }

    .page-go99__promo-icon {
      font-size: 3.5em;
      color: var(--page-go99-primary-color);
      margin-bottom: 15px;
    }

    .page-go99__promo-title {
      font-size: 2em;
      color: var(--page-go99-primary-color);
      margin-bottom: 10px;
    }

    .page-go99__promo-description {
      font-size: 1.1em;
      color: var(--page-go99-text-color);
      margin-bottom: 20px;
    }

    .page-go99__promo-action {
      display: inline-block;
      background-color: var(--page-go99-accent-color);
      color: var(--page-go99-light-text-color);
      padding: 12px 25px;
      border-radius: 30px;
      text-decoration: none;
      font-weight: bold;
      transition: background-color 0.3s ease;
      font-size: 1em;
    }

    .page-go99__promo-action:hover {
      background-color: #388E3C;
    }

    /* FAQ Section */
    .page-go99__faq-list {
      margin-top: 30px;
    }

    .page-go99__faq-item {
      background-color: #fefefe;
      border: 1px solid var(--page-go99-border-color);
      border-radius: 8px;
      margin-bottom: 15px;
      overflow: hidden;
      box-shadow: 0 2px 5px rgba(0, 0, 0, 0.05);
    }

    .page-go99__faq-question {
      display: flex;
      justify-content: space-between;
      align-items: center;
      padding: 18px 25px;
      background-color: #f0f0f0;
      cursor: pointer;
      user-select: none;
      font-size: 1.2em;
      color: var(--page-go99-dark-background);
      font-weight: bold;
      transition: background-color 0.3s ease;
    }

    .page-go99__faq-question:hover {
      background-color: #e0e0e0;
    }

    .page-go99__faq-question h3 {
      margin: 0;
      font-size: 1.2em;
      color: var(--page-go99-dark-background);
      pointer-events: none; /* Prevent h3 from blocking click */
    }

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

    .page-go99__faq-item.active .page-go99__faq-toggle {
      transform: rotate(45deg); /* Plus to X effect */
      color: var(--page-go99-accent-color);
    }

    .page-go99__faq-answer {
      max-height: 0;
      overflow: hidden;
      padding: 0 25px;
      opacity: 0;
      transition: max-height 0.4s cubic-bezier(0.4, 0, 0.2, 1), padding 0.4s ease, opacity 0.4s ease;
      background-color: #ffffff;
      color: var(--page-go99-text-color);
    }

    .page-go99__faq-item.active .page-go99__faq-answer {
      max-height: 2000px !important; /* Sufficiently large to contain any content */
      padding: 20px 25px !important;
      opacity: 1;
    }

    /* Contact Section */
    .page-go99__contact-info {
      display: flex;
      flex-wrap: wrap;
      justify-content: center;
      gap: 30px;
      margin-top: 30px;
    }

    .page-go99__contact-card {
      background-color: #fefefe;
      border-radius: 10px;
      box-shadow: 0 4px 12px rgba(0, 0, 0, 0.08);
      padding: 25px;
      text-align: center;
      flex: 1;
      min-width: 250px;
      max-width: 350px;
      box-sizing: border-box;
    }

    .page-go99__contact-icon {
      font-size: 3em;
      color: var(--page-go99-secondary-color);
      margin-bottom: 15px;
    }

    .page-go99__contact-title {
      font-size: 1.5em;
      color: var(--page-go99-primary-color);
      margin-bottom: 10px;
    }

    .page-go99__contact-detail {
      font-size: 1.1em;
      color: var(--page-go99-text-color);
      margin-bottom: 5px;
    }

    .page-go99__contact-link {
      color: var(--page-go99-primary-color);
      text-decoration: none;
      font-weight: bold;
      transition: color 0.3s ease;
    }

    .page-go99__contact-link:hover {
      color: var(--page-go99-secondary-color);
    }


    /* Responsive adjustments */
    @media (max-width: 768px) {
      .page-go99__hero-title {
        font-size: 2.5em;
      }

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

      .page-go99__section-title {
        font-size: 2em;
      }

      .page-go99__container {
        padding: 15px;
      }

      .page-go99__game-grid,
      .page-go99__guide-steps,
      .page-go99__promo-list,
      .page-go99__contact-info {
        grid-template-columns: 1fr;
        gap: 20px;
      }
      
      /* List items responsive */
      .page-go99__game-item,
      .page-go99__step-item,
      .page-go99__promo-card,
      .page-go99__contact-card {
        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-go99__faq-question,
      .page-go99__faq-answer {
        padding-left: 15px;
        padding-right: 15px;
      }

      .page-go99__faq-question h3 {
        font-size: 1.1em;
      }

      .page-go99__promo-button {
        font-size: 1em;
        padding: 12px 20px;
      }

      .page-go99__hero-section {
        padding-top: 70px; /* Slightly less padding for smaller screens if needed, but keeping it functional */
        height: auto; /* Allow height to adjust */
      }
      
      .page-go99__hero-image {
        height: 300px;
      }

      /* Ensure images are responsive */
      .page-go99__game-image {
        max-width: 100% !important;
        height: auto !important;
        box-sizing: border-box !important;
      }
      .page-go99__game-item {
        width: 100% !important;
        max-width: 100% !important;
        box-sizing: border-box !important;
        margin-left: 0 !important;
        margin-right: 0 !important;
      }
    }

    @media (max-width: 480px) {
      .page-go99__hero-title {
        font-size: 2em;
      }

      .page-go99__hero-subtitle {
        font-size: 1em;
      }

      .page-go99__section-title {
        font-size: 1.8em;
      }

      .page-go99__promo-button {
        font-size: 0.9em;
        padding: 10px 15px;
      }
      .page-go99__floating-promo {
        bottom: 15px;
        right: 15px;
      }
    }