:root {
    --primary-color: #11A84E;
    --secondary-color: #22C768;
    --button-gradient: linear-gradient(180deg, #2AD16F 0%, #13994A 100%);
    --card-bg: #11271B;
    --background: #08160F;
    --text-main: #F2FFF6;
    --text-secondary: #A7D9B8;
    --border-color: #2E7A4E;
    --glow-color: #57E38D;
    --gold-color: #F2C14E;
    --divider-color: #1E3A2A;
    --deep-green-color: #0A4B2C;
}

/* Basic Reset & Body Styling (Assuming shared.css handles body padding-top) */
.page-gioi-thieu-go99 {
    font-family: 'Arial', sans-serif;
    line-height: 1.6;
    color: var(--text-main);
    background-color: var(--background);
    padding-bottom: 50px;
}

.page-gioi-thieu-go99__container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

/* Section Styling */
.page-gioi-thieu-go99__hero-section,
.page-gioi-thieu-go99__about-section,
.page-gioi-thieu-go99__why-choose-us,
.page-gioi-thieu-go99__commitment-section,
.page-gioi-thieu-go99__game-types,
.page-gioi-thieu-go99__cta-section,
.page-gioi-thieu-go99__faq-section {
    padding: 60px 0;
    position: relative;
    z-index: 1;
}

.page-gioi-thieu-go99__light-bg {
    background-color: var(--background);
    color: var(--text-main);
}

.page-gioi-thieu-go99__dark-bg {
    background-color: var(--card-bg);
    color: var(--text-main);
}

/* Hero Section */
.page-gioi-thieu-go99__hero-section {
    padding-top: 10px; /* Small top padding, body handles header offset */
    text-align: center;
    overflow: hidden;
    position: relative;
    padding-bottom: 80px;
}

.page-gioi-thieu-go99__hero-image {
    position: relative;
    width: 100%;
    height: 500px; /* Fixed height for desktop */
    margin-bottom: 30px;
    overflow: hidden;
    border-radius: 10px;
}

.page-gioi-thieu-go99__hero-image img {
    width: 100%;
    height: 100%;
    object-fit: cover; /* Cover for desktop */
    display: block;
    border-radius: 10px;
}

.page-gioi-thieu-go99__hero-content {
    max-width: 900px;
    margin: 0 auto;
    padding: 0 20px;
    position: relative;
    z-index: 2;
}

.page-gioi-thieu-go99__main-title {
    font-size: clamp(2.5rem, 4vw, 3.5rem);
    font-weight: 700;
    color: var(--text-main);
    margin-bottom: 20px;
    line-height: 1.2;
    text-shadow: 0 2px 4px rgba(0,0,0,0.3);
}

.page-gioi-thieu-go99__hero-description {
    font-size: 1.15rem;
    color: var(--text-secondary);
    margin-bottom: 30px;
    max-width: 800px;
    margin-left: auto;
    margin-right: auto;
}

/* Buttons */
.page-gioi-thieu-go99__cta-buttons {
    display: flex;
    justify-content: center;
    gap: 20px;
    margin-top: 30px;
}

.page-gioi-thieu-go99__btn-primary,
.page-gioi-thieu-go99__btn-secondary {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 14px 30px;
    border-radius: 8px;
    font-size: 1.1rem;
    font-weight: 600;
    text-decoration: none;
    transition: all 0.3s ease;
    cursor: pointer;
    white-space: normal;
    word-wrap: break-word;
    box-sizing: border-box;
    max-width: 100%;
}

.page-gioi-thieu-go99__btn-primary {
    background: var(--button-gradient);
    color: #ffffff;
    border: none;
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.2);
}

.page-gioi-thieu-go99__btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(0, 0, 0, 0.3);
    opacity: 0.9;
}

.page-gioi-thieu-go99__btn-secondary {
    background-color: transparent;
    color: var(--glow-color);
    border: 2px solid var(--glow-color);
}

.page-gioi-thieu-go99__btn-secondary:hover {
    background-color: rgba(87, 227, 141, 0.1);
    transform: translateY(-2px);
    opacity: 0.9;
}

/* Section Titles */
.page-gioi-thieu-go99__section-title {
    font-size: 2.2rem;
    font-weight: 700;
    color: var(--text-main);
    text-align: center;
    margin-bottom: 40px;
    line-height: 1.3;
}

.page-gioi-thieu-go99__section-title--light {
    color: var(--text-main);
}

.page-gioi-thieu-go99__subtitle {
    font-size: 1.1rem;
    color: var(--text-secondary);
    text-align: center;
    margin-bottom: 50px;
    max-width: 800px;
    margin-left: auto;
    margin-right: auto;
}

.page-gioi-thieu-go99__subtitle--light {
    color: var(--text-secondary);
}

/* General Content Wrapper for Text & Image blocks */
.page-gioi-thieu-go99__content-wrapper {
    display: flex;
    align-items: center;
    gap: 40px;
    margin-bottom: 40px;
}

.page-gioi-thieu-go99__content-wrapper--reverse {
    flex-direction: row-reverse;
}

.page-gioi-thieu-go99__text-block {
    flex: 1;
    padding-right: 20px;
}

.page-gioi-thieu-go99__text-block p {
    margin-bottom: 20px;
    font-size: 1rem;
    color: var(--text-secondary);
}

.page-gioi-thieu-go99__text-block .page-gioi-thieu-go99__read-more-link {
    color: var(--glow-color);
    text-decoration: none;
    font-weight: 600;
    transition: color 0.3s ease;
}

.page-gioi-thieu-go99__text-block .page-gioi-thieu-go99__read-more-link:hover {
    color: #57E38D;
    text-decoration: underline;
}

.page-gioi-thieu-go99__image-block {
    flex: 1;
    min-width: 400px;
}

.page-gioi-thieu-go99__image-block img {
    width: 100%;
    height: auto;
    display: block;
    border-radius: 10px;
    box-shadow: 0 8px 25px rgba(0,0,0,0.2);
}

/* Features Grid */
.page-gioi-thieu-go99__features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 30px;
    margin-top: 40px;
}

.page-gioi-thieu-go99__feature-card {
    background-color: var(--card-bg);
    border-radius: 10px;
    padding: 30px;
    text-align: center;
    box-shadow: 0 5px 20px rgba(0,0,0,0.2);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
    border: 1px solid var(--border-color);
}

.page-gioi-thieu-go99__feature-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 30px rgba(0,0,0,0.3);
}

.page-gioi-thieu-go99__feature-card img {
    width: 100%;
    height: 200px;
    object-fit: cover;
    border-radius: 8px;
    margin-bottom: 20px;
    min-width: 200px;
    min-height: 200px;
}

.page-gioi-thieu-go99__card-title {
    font-size: 1.4rem;
    font-weight: 600;
    color: var(--text-main);
    margin-bottom: 15px;
}

.page-gioi-thieu-go99__feature-card p {
    font-size: 0.95rem;
    color: var(--text-secondary);
}

/* Game Types Grid */
.page-gioi-thieu-go99__game-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 30px;
}

.page-gioi-thieu-go99__game-card {
    display: block;
    background-color: var(--card-bg);
    border-radius: 10px;
    overflow: hidden;
    text-decoration: none;
    color: inherit;
    box-shadow: 0 5px 20px rgba(0,0,0,0.2);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
    border: 1px solid var(--border-color);
}

.page-gioi-thieu-go99__game-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 30px rgba(0,0,0,0.3);
}

.page-gioi-thieu-go99__game-card img {
    width: 100%;
    height: 220px;
    object-fit: cover;
    display: block;
    min-width: 200px;
    min-height: 200px;
}

.page-gioi-thieu-go99__game-card .page-gioi-thieu-go99__card-title {
    padding: 15px 20px 5px;
    margin-bottom: 5px;
    color: var(--gold-color);
}

.page-gioi-thieu-go99__game-card p {
    font-size: 0.9rem;
    color: var(--text-secondary);
    padding: 0 20px 20px;
}

/* CTA Section */
.page-gioi-thieu-go99__cta-container {
    display: flex;
    align-items: center;
    gap: 40px;
    background-color: var(--card-bg);
    border-radius: 15px;
    padding: 50px;
    box-shadow: 0 10px 30px rgba(0,0,0,0.3);
    border: 1px solid var(--border-color);
}

.page-gioi-thieu-go99__cta-content {
    flex: 2;
    text-align: left;
}

.page-gioi-thieu-go99__cta-content .page-gioi-thieu-go99__section-title {
    text-align: left;
    margin-bottom: 20px;
    color: var(--text-main);
}

.page-gioi-thieu-go99__cta-content .page-gioi-thieu-go99__subtitle {
    text-align: left;
    margin-bottom: 30px;
    color: var(--text-secondary);
}

.page-gioi-thieu-go99__cta-image {
    flex: 1;
    min-width: 300px;
}

.page-gioi-thieu-go99__cta-image img {
    width: 100%;
    height: auto;
    display: block;
    border-radius: 10px;
    box-shadow: 0 5px 15px rgba(0,0,0,0.2);
}

/* FAQ Section */
.page-gioi-thieu-go99__faq-list {
    margin-top: 40px;
    max-width: 900px;
    margin-left: auto;
    margin-right: auto;
}

details.page-gioi-thieu-go99__faq-item {
  margin-bottom: 15px;
  border-radius: 5px;
  border: 1px solid var(--border-color);
  overflow: hidden;
  background: var(--card-bg);
}
details.page-gioi-thieu-go99__faq-item summary.page-gioi-thieu-go99__faq-question {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 18px 20px;
  cursor: pointer;
  user-select: none;
  list-style: none;
  transition: background-color 0.3s ease;
}
details.page-gioi-thieu-go99__faq-item summary.page-gioi-thieu-go99__faq-question::-webkit-details-marker {
  display: none;
}
details.page-gioi-thieu-go99__faq-item summary.page-gioi-thieu-go99__faq-question:hover {
  background: var(--deep-green-color);
}
.page-gioi-thieu-go99__faq-qtext {
  flex: 1;
  font-size: 16px;
  font-weight: 600;
  line-height: 1.5;
  text-align: left;
  color: var(--text-main);
}
.page-gioi-thieu-go99__faq-toggle {
  font-size: 24px;
  font-weight: bold;
  color: var(--text-secondary);
  flex-shrink: 0;
  margin-left: 15px;
  width: 28px;
  text-align: center;
}
details.page-gioi-thieu-go99__faq-item .page-gioi-thieu-go99__faq-answer {
  padding: 0 20px 20px;
  background: var(--background);
  border-radius: 0 0 5px 5px;
  color: var(--text-secondary);
  font-size: 0.95rem;
}

/* Responsive Design */
@media (max-width: 1024px) {
    .page-gioi-thieu-go99__container {
        padding: 0 15px;
    }

    .page-gioi-thieu-go99__hero-section {
        padding-bottom: 60px;
    }

    .page-gioi-thieu-go99__hero-image {
        height: 400px;
    }

    .page-gioi-thieu-go99__main-title {
        font-size: clamp(2rem, 3.5vw, 3rem);
    }

    .page-gioi-thieu-go99__hero-description {
        font-size: 1.05rem;
    }

    .page-gioi-thieu-go99__section-title {
        font-size: 2rem;
    }

    .page-gioi-thieu-go99__content-wrapper {
        flex-direction: column;
        gap: 30px;
    }

    .page-gioi-thieu-go99__content-wrapper--reverse {
        flex-direction: column;
    }

    .page-gioi-thieu-go99__text-block {
        padding-right: 0;
    }

    .page-gioi-thieu-go99__image-block {
        min-width: unset;
        width: 100%;
    }

    .page-gioi-thieu-go99__features-grid,
    .page-gioi-thieu-go99__game-grid {
        grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    }

    .page-gioi-thieu-go99__cta-container {
        flex-direction: column;
        padding: 40px;
        text-align: center;
    }

    .page-gioi-thieu-go99__cta-content,
    .page-gioi-thieu-go99__cta-image {
        flex: unset;
        width: 100%;
    }

    .page-gioi-thieu-go99__cta-content .page-gioi-thieu-go99__section-title,
    .page-gioi-thieu-go99__cta-content .page-gioi-thieu-go99__subtitle {
        text-align: center;
    }

    .page-gioi-thieu-go99__cta-buttons {
        flex-direction: row;
        flex-wrap: wrap;
        gap: 15px;
    }
}

@media (max-width: 768px) {
    /* General */
    .page-gioi-thieu-go99 {
        font-size: 16px;
        line-height: 1.6;
    }
    .page-gioi-thieu-go99__container,
    .page-gioi-thieu-go99__section,
    .page-gioi-thieu-go99__card,
    .page-gioi-thieu-go99__box {
        max-width: 100% !important;
        width: 100% !important;
        box-sizing: border-box !important;
        padding-left: 15px;
        padding-right: 15px;
    }

    /* Hero Section */
    .page-gioi-thieu-go99__hero-section {
        padding-top: 10px;
        padding-bottom: 40px;
    }
    .page-gioi-thieu-go99__hero-image {
        height: auto !important;
        aspect-ratio: 16/9;
        margin-bottom: 20px;
    }
    .page-gioi-thieu-go99__hero-image img {
        object-fit: contain !important;
        aspect-ratio: unset !important;
        min-width: 200px !important;
        min-height: 200px !important;
        max-width: 100% !important;
        width: 100% !important;
        height: auto !important;
    }
    .page-gioi-thieu-go99__main-title {
        font-size: clamp(1.8rem, 7vw, 2.5rem);
        margin-bottom: 15px;
    }
    .page-gioi-thieu-go99__hero-description {
        font-size: 1rem;
        margin-bottom: 20px;
    }

    /* Buttons */
    .page-gioi-thieu-go99__cta-buttons {
        flex-direction: column !important;
        gap: 10px !important;
        width: 100% !important;
        max-width: 100% !important;
        box-sizing: border-box !important;
        padding-left: 15px;
        padding-right: 15px;
    }
    .page-gioi-thieu-go99__btn-primary,
    .page-gioi-thieu-go99__btn-secondary,
    .page-gioi-thieu-go99 a[class*="button"],
    .page-gioi-thieu-go99 a[class*="btn"] {
        max-width: 100% !important;
        width: 100% !important;
        box-sizing: border-box !important;
        white-space: normal !important;
        word-wrap: break-word !important;
        padding-left: 15px;
        padding-right: 15px;
    }

    /* Sections */
    .page-gioi-thieu-go99__hero-section,
    .page-gioi-thieu-go99__about-section,
    .page-gioi-thieu-go99__why-choose-us,
    .page-gioi-thieu-go99__commitment-section,
    .page-gioi-thieu-go99__game-types,
    .page-gioi-thieu-go99__cta-section,
    .page-gioi-thieu-go99__faq-section {
        padding: 40px 0;
    }

    .page-gioi-thieu-go99__section-title {
        font-size: 1.8rem;
        margin-bottom: 30px;
    }

    .page-gioi-thieu-go99__subtitle {
        font-size: 1rem;
        margin-bottom: 30px;
    }
}