:root {
      --page-go99-primary-color: #f1c40f; /* Vàng sáng */
      --page-go99-secondary-color: #e67e22; /* Cam */
      --page-go99-dark-bg: #2c3e50; /* Xám xanh đậm */
      --page-go99-light-bg: #ecf0f1; /* Xám nhạt */
      --page-go99-text-color: #34495e; /* Xám đậm */
      --page-go99-white-text: #ffffff;
      --page-go99-border-radius: 8px;
      --page-go99-transition-speed: 0.3s ease;
    }

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

    /* Hero Section */
    .page-go99__hero-section {
      position: relative;
      width: 100%;
      min-height: 400px;
      display: flex;
      align-items: center;
      justify-content: center;
      text-align: center;
      background: linear-gradient(rgba(0, 0, 0, 0.5), rgba(0, 0, 0, 0.5)), url('[GALLERY:hero:go99,banner,game]') center center / cover no-repeat;
      color: var(--page-go99-white-text);
      padding: 10px 20px 80px; /* Adjust padding-top as per instruction, and padding-bottom for content */
      box-sizing: border-box;
      overflow: hidden;
    }

    .page-go99__hero-content {
      max-width: 900px;
      z-index: 1;
    }

    .page-go99__hero-title {
      font-size: 2.8em;
      margin-bottom: 15px;
      font-weight: bold;
      color: var(--page-go99-primary-color);
      text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.7);
    }

    .page-go99__hero-subtitle {
      font-size: 1.3em;
      margin-bottom: 30px;
      color: var(--page-go99-white-text);
      text-shadow: 1px 1px 3px rgba(0, 0, 0, 0.6);
    }

    .page-go99__cta-button {
      display: inline-block;
      background-color: var(--page-go99-secondary-color);
      color: var(--page-go99-white-text);
      padding: 15px 30px;
      border-radius: var(--page-go99-border-radius);
      text-decoration: none;
      font-weight: bold;
      font-size: 1.1em;
      transition: background-color var(--page-go99-transition-speed);
      border: none; /* Use button for no link, but here it's an external link so <a> is fine */
      cursor: pointer;
    }

    .page-go99__cta-button:hover {
      background-color: #d35400; /* Darker orange */
    }

    /* Floating Login Button */
    .page-go99__floating-login-button {
      position: fixed;
      bottom: 20px;
      right: 20px;
      background-color: var(--page-go99-primary-color);
      color: var(--page-go99-dark-bg);
      padding: 12px 25px;
      border-radius: 50px;
      text-decoration: none;
      font-weight: bold;
      font-size: 1.1em;
      box-shadow: 0 4px 10px rgba(0, 0, 0, 0.3);
      z-index: 1000;
      transition: transform var(--page-go99-transition-speed), background-color var(--page-go99-transition-speed);
      display: flex;
      align-items: center;
      gap: 8px;
      border: none;
      cursor: pointer;
    }

    .page-go99__floating-login-button:hover {
      background-color: #f39c12; /* Slightly darker yellow */
      transform: translateY(-3px);
    }

    /* General Section Styling */
    .page-go99__section {
      padding: 60px 20px;
      margin: 0 auto;
      max-width: 1200px;
      box-sizing: border-box;
    }

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

    .page-go99__section-heading {
      text-align: center;
      font-size: 2.2em;
      margin-bottom: 40px;
      color: var(--page-go99-primary-color);
      font-weight: bold;
    }

    .page-go99__section-dark .page-go99__section-heading {
      color: var(--page-go99-primary-color);
    }

    /* About Section */
    .page-go99__about-content {
      display: flex;
      flex-wrap: wrap;
      gap: 30px;
      align-items: center;
      justify-content: center;
    }

    .page-go99__about-text {
      flex: 1;
      min-width: 300px;
      max-width: 600px;
      font-size: 1.1em;
      text-align: justify;
    }

    .page-go99__about-image {
      flex: 1;
      min-width: 300px;
      max-width: 500px;
      border-radius: var(--page-go99-border-radius);
      overflow: hidden;
      box-shadow: 0 4px 15px rgba(0, 0, 0, 0.2);
    }

    .page-go99__about-image img {
      width: 100%;
      height: auto;
      display: block;
    }

    /* Game Categories */
    .page-go99__game-grid {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
      gap: 30px;
      justify-content: center;
      text-align: center;
    }

    .page-go99__game-card {
      background-color: var(--page-go99-white-text);
      border-radius: var(--page-go99-border-radius);
      box-shadow: 0 4px 15px rgba(0, 0, 0, 0.1);
      overflow: hidden;
      transition: transform var(--page-go99-transition-speed), box-shadow var(--page-go99-transition-speed);
      display: flex;
      flex-direction: column;
      align-items: center;
      padding-bottom: 20px;
    }

    .page-go99__game-card:hover {
      transform: translateY(-5px);
      box-shadow: 0 8px 20px rgba(0, 0, 0, 0.15);
    }

    .page-go99__game-card-image {
      width: 100%;
      height: 200px;
      overflow: hidden;
      display: flex;
      align-items: center;
      justify-content: center;
    }

    .page-go99__game-card-image img {
      width: 100%;
      height: auto;
      object-fit: cover;
      display: block;
    }

    .page-go99__game-card-title {
      font-size: 1.5em;
      font-weight: bold;
      margin: 20px 15px 10px;
      color: var(--page-go99-dark-bg);
    }

    .page-go99__game-card-description {
      font-size: 0.95em;
      color: var(--page-go99-text-color);
      padding: 0 15px;
      margin-bottom: 20px;
      flex-grow: 1;
    }

    /* App Download Section */
    .page-go99__download-content {
      display: flex;
      flex-wrap: wrap;
      gap: 30px;
      align-items: center;
      justify-content: center;
      text-align: center;
    }

    .page-go99__download-text {
      flex: 1;
      min-width: 300px;
      max-width: 500px;
    }

    .page-go99__download-text h3 {
      font-size: 1.8em;
      color: var(--page-go99-primary-color);
      margin-bottom: 20px;
    }

    .page-go99__download-text p {
      font-size: 1.1em;
      margin-bottom: 25px;
      color: var(--page-go99-white-text);
    }

    .page-go99__download-buttons {
      display: flex;
      gap: 15px;
      justify-content: center;
      flex-wrap: wrap;
    }

    .page-go99__download-button {
      background-color: var(--page-go99-secondary-color);
      color: var(--page-go99-white-text);
      padding: 12px 25px;
      border-radius: var(--page-go99-border-radius);
      text-decoration: none;
      font-weight: bold;
      transition: background-color var(--page-go99-transition-speed);
      border: none;
      cursor: pointer;
    }

    .page-go99__download-button:hover {
      background-color: #d35400;
    }

    .page-go99__download-qr {
      flex: 1;
      min-width: 250px;
      max-width: 300px;
      background-color: var(--page-go99-white-text);
      padding: 20px;
      border-radius: var(--page-go99-border-radius);
      box-shadow: 0 4px 15px rgba(0, 0, 0, 0.2);
    }

    .page-go99__download-qr img {
      width: 100%;
      height: auto;
      display: block;
      margin-bottom: 15px;
    }

    .page-go99__download-qr p {
      color: var(--page-go99-text-color);
      font-weight: bold;
    }

    /* Promotions Section */
    .page-go99__promo-grid {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
      gap: 30px;
      justify-content: center;
    }

    .page-go99__promo-card {
      background-color: var(--page-go99-white-text);
      border-radius: var(--page-go99-border-radius);
      box-shadow: 0 4px 15px rgba(0, 0, 0, 0.1);
      overflow: hidden;
      transition: transform var(--page-go99-transition-speed), box-shadow var(--page-go99-transition-speed);
      text-align: center;
    }

    .page-go99__promo-card:hover {
      transform: translateY(-5px);
      box-shadow: 0 8px 20px rgba(0, 0, 0, 0.15);
    }

    .page-go99__promo-card-image {
      width: 100%;
      height: 220px;
      overflow: hidden;
      display: flex;
      align-items: center;
      justify-content: center;
    }

    .page-go99__promo-card-image img {
      width: 100%;
      height: auto;
      object-fit: cover;
      display: block;
    }

    .page-go99__promo-card-content {
      padding: 20px;
    }

    .page-go99__promo-card-title {
      font-size: 1.6em;
      font-weight: bold;
      color: var(--page-go99-dark-bg);
      margin-bottom: 10px;
    }

    .page-go99__promo-card-description {
      font-size: 1em;
      color: var(--page-go99-text-color);
      margin-bottom: 20px;
    }

    /* FAQ Section */
    .page-go99__faq-list {
      max-width: 800px;
      margin: 0 auto;
    }

    .page-go99__faq-item {
      background-color: var(--page-go99-white-text);
      border-radius: var(--page-go99-border-radius);
      margin-bottom: 15px;
      box-shadow: 0 2px 10px rgba(0, 0, 0, 0.08);
      overflow: hidden;
    }

    .page-go99__faq-question {
      display: flex;
      justify-content: space-between;
      align-items: center;
      padding: 20px 25px;
      cursor: pointer;
      background-color: #f9f9f9;
      border-bottom: 1px solid #eee;
      transition: background-color var(--page-go99-transition-speed);
      user-select: none;
    }

    .page-go99__faq-question:hover {
      background-color: #f0f0f0;
    }

    .page-go99__faq-question h3 {
      margin: 0;
      font-size: 1.2em;
      color: var(--page-go99-dark-bg);
      pointer-events: none; /* Prevent text selection interfering with click */
    }

    .page-go99__faq-toggle {
      font-size: 1.8em;
      font-weight: bold;
      color: var(--page-go99-secondary-color);
      transition: transform var(--page-go99-transition-speed);
      pointer-events: none; /* Prevent icon interfering with click */
    }

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

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

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

    /* Guide Section */
    .page-go99__guide-grid {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
      gap: 30px;
      justify-content: center;
    }

    .page-go99__guide-card {
      background-color: var(--page-go99-white-text);
      border-radius: var(--page-go99-border-radius);
      box-shadow: 0 4px 15px rgba(0, 0, 0, 0.1);
      padding: 30px;
      text-align: center;
      transition: transform var(--page-go99-transition-speed);
    }

    .page-go99__guide-card:hover {
      transform: translateY(-5px);
    }

    .page-go99__guide-card h3 {
      font-size: 1.5em;
      color: var(--page-go99-dark-bg);
      margin-bottom: 15px;
    }

    .page-go99__guide-card p {
      color: var(--page-go99-text-color);
      margin-bottom: 20px;
    }

    .page-go99__guide-card .page-go99__cta-button {
      padding: 10px 20px;
      font-size: 1em;
    }

    /* Responsive adjustments */
    @media (max-width: 768px) {
      .page-go99__hero-section {
        min-height: 300px;
        padding: 10px 15px 60px; /* Adjust padding-top as per instruction */
      }

      .page-go99__hero-title {
        font-size: 2em;
      }

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

      .page-go99__floating-login-button {
        bottom: 15px;
        right: 15px;
        padding: 10px 20px;
        font-size: 1em;
      }

      .page-go99__section {
        padding: 40px 15px;
      }

      .page-go99__section-heading {
        font-size: 1.8em;
        margin-bottom: 30px;
      }

      .page-go99__about-content,
      .page-go99__download-content {
        flex-direction: column;
        text-align: center;
      }

      .page-go99__about-text,
      .page-go99__download-text {
        min-width: unset;
        max-width: 100%;
      }

      .page-go99__download-qr {
        min-width: unset;
        max-width: 80%;
      }

      .page-go99__game-card-title,
      .page-go99__promo-card-title,
      .page-go99__guide-card h3 {
        font-size: 1.3em;
      }

      .page-go99__game-card-description,
      .page-go99__promo-card-description,
      .page-go99__download-text p {
        font-size: 0.9em;
      }

      .page-go99__faq-question {
        padding: 15px 20px;
      }

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

      .page-go99__faq-answer {
        padding: 0 20px;
      }

      .page-go99__faq-item.active .page-go99__faq-answer {
        padding: 15px 20px !important;
      }

      /* Image responsive optimization for mobile */
      img {
        max-width: 100% !important;
        height: auto !important;
      }
      .page-go99__about-image,
      .page-go99__game-card-image,
      .page-go99__promo-card-image,
      .page-go99__download-qr {
        width: 100% !important;
        max-width: 100% !important;
        overflow: hidden !important;
        box-sizing: border-box !important;
      }
    }