/* Base styles for the page-gioi-thieu-ung-dung */
.page-gioi-thieu-ung-dung {
  font-family: Arial, sans-serif;
  line-height: 1.6;
  color: var(--text-main, #F3F8FF); /* Default text color for dark body bg */
  background-color: var(--card-bg, #10233F); /* Body background from shared */
}

.page-gioi-thieu-ung-dung__container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 20px;
  box-sizing: border-box;
}

.page-gioi-thieu-ung-dung__hero-section {
  padding-top: 10px; /* Small top padding, body handles header offset */
  padding-bottom: 40px;
  text-align: center;
  background: linear-gradient(180deg, #113B7A 0%, #08162B 100%);
  color: var(--text-main, #F3F8FF);
}

.page-gioi-thieu-ung-dung__hero-image {
  max-width: 100%;
  height: auto;
  display: block;
  margin: 0 auto 30px auto;
  border-radius: 10px;
  box-shadow: 0 8px 20px rgba(0, 0, 0, 0.3);
}

.page-gioi-thieu-ung-dung__main-title {
  font-weight: bold;
  color: var(--text-main, #F3F8FF);
  margin-bottom: 20px;
  line-height: 1.2;
  text-shadow: 2px 2px 4px rgba(0,0,0,0.5);
}

.page-gioi-thieu-ung-dung__description {
  font-size: 1.1em;
  margin-bottom: 30px;
  color: var(--text-secondary, #AFC4E8);
  max-width: 800px;
  margin-left: auto;
  margin-right: auto;
}

.page-gioi-thieu-ung-dung__btn-primary,
.page-gioi-thieu-ung-dung__btn-secondary {
  display: inline-block;
  padding: 12px 25px;
  border-radius: 8px;
  text-decoration: none;
  font-weight: bold;
  transition: background-color 0.3s ease, transform 0.2s ease;
  margin: 10px 10px 0 0;
  white-space: normal;
  word-wrap: break-word;
  box-sizing: border-box;
  max-width: 100%;
}

.page-gioi-thieu-ung-dung__btn-primary {
  background: linear-gradient(180deg, #2B73F6 0%, #1144A6 100%);
  color: #ffffff;
  border: none;
}

.page-gioi-thieu-ung-dung__btn-primary:hover {
  background: linear-gradient(180deg, #1144A6 0%, #2B73F6 100%);
  transform: translateY(-2px);
}

.page-gioi-thieu-ung-dung__btn-secondary {
  background: transparent;
  color: var(--glow, #4FA8FF);
  border: 2px solid var(--glow, #4FA8FF);
}

.page-gioi-thieu-ung-dung__btn-secondary:hover {
  background: rgba(79, 168, 255, 0.1);
  transform: translateY(-2px);
}

.page-gioi-thieu-ung-dung__section {
  padding: 60px 0;
}

.page-gioi-thieu-ung-dung__light-bg {
  background-color: #ffffff;
  color: #333333;
}

.page-gioi-thieu-ung-dung__dark-bg {
  background-color: var(--deep-navy, #08162B);
  color: var(--text-main, #F3F8FF);
}

.page-gioi-thieu-ung-dung__heading {
  font-size: 2.2em;
  font-weight: bold;
  text-align: center;
  margin-bottom: 40px;
  color: inherit; /* Inherit color from section */
}

.page-gioi-thieu-ung-dung__text-block {
  font-size: 1.05em;
  text-align: center;
  max-width: 900px;
  margin: 0 auto 30px auto;
  color: inherit;
}

.page-gioi-thieu-ung-dung__grid-3-cols {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 30px;
  margin-top: 40px;
}

.page-gioi-thieu-ung-dung__card {
  background-color: var(--card-bg, #10233F);
  border-radius: 12px;
  padding: 30px;
  box-shadow: 0 4px 15px rgba(0, 0, 0, 0.2);
  text-align: center;
  color: var(--text-main, #F3F8FF);
  display: flex;
  flex-direction: column;
  height: 100%;
  border: 1px solid var(--border, #244D84);
}

.page-gioi-thieu-ung-dung__card-image {
  max-width: 100%;
  height: auto;
  border-radius: 8px;
  margin-bottom: 20px;
  object-fit: cover;
  min-height: 200px;
  min-width: 200px;
}

.page-gioi-thieu-ung-dung__card-title {
  font-size: 1.5em;
  font-weight: bold;
  margin-bottom: 15px;
  color: var(--glow, #4FA8FF);
}

.page-gioi-thieu-ung-dung__card-text {
  font-size: 0.95em;
  color: var(--text-secondary, #AFC4E8);
  flex-grow: 1;
}

.page-gioi-thieu-ung-dung__button-group {
  text-align: center;
  margin-top: 40px;
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 15px;
  max-width: 100%;
  box-sizing: border-box;
  overflow: hidden;
}

.page-gioi-thieu-ung-dung__feature-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 30px;
  margin-top: 40px;
}

.page-gioi-thieu-ung-dung__feature-item {
  background-color: var(--card-bg, #10233F);
  border-radius: 12px;
  padding: 30px;
  box-shadow: 0 4px 15px rgba(0, 0, 0, 0.2);
  text-align: center;
  color: var(--text-main, #F3F8FF);
  border: 1px solid var(--border, #244D84);
}

.page-gioi-thieu-ung-dung__feature-icon {
  max-width: 100%;
  height: auto;
  margin-bottom: 20px;
  object-fit: cover;
  border-radius: 8px;
  min-height: 200px;
  min-width: 200px;
}

.page-gioi-thieu-ung-dung__feature-title {
  font-size: 1.6em;
  font-weight: bold;
  margin-bottom: 15px;
  color: var(--glow, #4FA8FF);
}

.page-gioi-thieu-ung-dung__feature-description {
  font-size: 0.95em;
  color: var(--text-secondary, #AFC4E8);
}

.page-gioi-thieu-ung-dung__download-steps {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 30px;
  margin-top: 40px;
}

.page-gioi-thieu-ung-dung__step-item {
  background-color: var(--card-bg, #10233F);
  border-radius: 12px;
  padding: 30px;
  box-shadow: 0 4px 15px rgba(0, 0, 0, 0.2);
  text-align: center;
  color: var(--text-main, #F3F8FF);
  max-width: 500px;
  flex: 1 1 45%;
  border: 1px solid var(--border, #244D84);
}

.page-gioi-thieu-ung-dung__step-title {
  font-size: 1.6em;
  font-weight: bold;
  margin-bottom: 20px;
  color: var(--glow, #4FA8FF);
}

.page-gioi-thieu-ung-dung__step-image {
  max-width: 100%;
  height: auto;
  border-radius: 8px;
  margin-bottom: 20px;
  object-fit: cover;
  min-height: 200px;
  min-width: 200px;
}

.page-gioi-thieu-ung-dung__step-description {
  font-size: 0.95em;
  color: var(--text-secondary, #AFC4E8);
}

.page-gioi-thieu-ung-dung__note {
  font-style: italic;
  color: var(--text-secondary, #AFC4E8);
  margin-top: 20px;
  text-align: center;
}

.page-gioi-thieu-ung-dung__steps-list {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 30px;
  margin-top: 40px;
}

.page-gioi-thieu-ung-dung__step-card {
  background-color: var(--card-bg, #10233F);
  border-radius: 12px;
  padding: 30px;
  box-shadow: 0 4px 15px rgba(0, 0, 0, 0.2);
  text-align: center;
  color: var(--text-main, #F3F8FF);
  display: flex;
  flex-direction: column;
  height: 100%;
  border: 1px solid var(--border, #244D84);
}

.page-gioi-thieu-ung-dung__step-number {
  font-size: 2.5em;
  font-weight: bold;
  color: var(--gold, #F2C14E);
  margin-bottom: 15px;
}

.page-gioi-thieu-ung-dung__step-card-title {
  font-size: 1.6em;
  font-weight: bold;
  margin-bottom: 15px;
  color: var(--glow, #4FA8FF);
}

.page-gioi-thieu-ung-dung__step-card-description {
  font-size: 0.95em;
  color: var(--text-secondary, #AFC4E8);
  flex-grow: 1;
  margin-bottom: 20px;
}

.page-gioi-thieu-ung-dung__btn-outline {
  display: inline-block;
  padding: 10px 20px;
  border-radius: 8px;
  text-decoration: none;
  font-weight: bold;
  color: var(--gold, #F2C14E);
  border: 2px solid var(--gold, #F2C14E);
  background: transparent;
  transition: background-color 0.3s ease, color 0.3s ease, transform 0.2s ease;
  margin-top: auto;
  white-space: normal;
  word-wrap: break-word;
  box-sizing: border-box;
  max-width: 100%;
}

.page-gioi-thieu-ung-dung__btn-outline:hover {
  background-color: var(--gold, #F2C14E);
  color: var(--deep-navy, #08162B);
  transform: translateY(-2px);
}

.page-gioi-thieu-ung-dung__security-features {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 30px;
  margin-top: 40px;
}

.page-gioi-thieu-ung-dung__security-item {
  background-color: var(--card-bg, #10233F);
  border-radius: 12px;
  padding: 30px;
  box-shadow: 0 4px 15px rgba(0, 0, 0, 0.2);
  text-align: center;
  color: var(--text-main, #F3F8FF);
  max-width: 500px;
  flex: 1 1 45%;
  border: 1px solid var(--border, #244D84);
}

.page-gioi-thieu-ung-dung__security-icon {
  max-width: 100%;
  height: auto;
  border-radius: 8px;
  margin-bottom: 20px;
  object-fit: cover;
  min-height: 200px;
  min-width: 200px;
}

.page-gioi-thieu-ung-dung__security-title {
  font-size: 1.6em;
  font-weight: bold;
  margin-bottom: 15px;
  color: var(--glow, #4FA8FF);
}

.page-gioi-thieu-ung-dung__security-description {
  font-size: 0.95em;
  color: var(--text-secondary, #AFC4E8);
}

.page-gioi-thieu-ung-dung__support-channels {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 30px;
  margin-top: 40px;
}

.page-gioi-thieu-ung-dung__support-item {
  background-color: var(--card-bg, #10233F);
  border-radius: 12px;
  padding: 30px;
  box-shadow: 0 4px 15px rgba(0, 0, 0, 0.2);
  text-align: center;
  color: var(--text-main, #F3F8FF);
  max-width: 400px;
  flex: 1 1 40%;
  border: 1px solid var(--border, #244D84);
}

.page-gioi-thieu-ung-dung__support-title {
  font-size: 1.6em;
  font-weight: bold;
  margin-bottom: 15px;
  color: var(--glow, #4FA8FF);
}

.page-gioi-thieu-ung-dung__support-description {
  font-size: 0.95em;
  color: var(--text-secondary, #AFC4E8);
}

.page-gioi-thieu-ung-dung__faq-list {
  margin-top: 40px;
  max-width: 900px;
  margin-left: auto;
  margin-right: auto;
}

.page-gioi-thieu-ung-dung__faq-item {
  background-color: var(--card-bg, #10233F);
  border-radius: 12px;
  margin-bottom: 15px;
  border: 1px solid var(--border, #244D84);
  overflow: hidden;
  color: var(--text-main, #F3F8FF);
}

.page-gioi-thieu-ung-dung__faq-question {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 20px 30px;
  cursor: pointer;
  font-weight: bold;
  font-size: 1.1em;
  color: var(--glow, #4FA8FF);
  list-style: none; /* For details/summary */
}

.page-gioi-thieu-ung-dung__faq-question::-webkit-details-marker {
  display: none;
}

.page-gioi-thieu-ung-dung__faq-toggle {
  font-size: 1.5em;
  line-height: 1;
  transition: transform 0.3s ease;
  pointer-events: none; /* Allow click on summary, not just plus */
}

.page-gioi-thieu-ung-dung__faq-item[open] .page-gioi-thieu-ung-dung__faq-toggle {
  transform: rotate(45deg);
}

.page-gioi-thieu-ung-dung__faq-answer {
  padding: 0 30px 20px 30px;
  font-size: 0.95em;
  color: var(--text-secondary, #AFC4E8);
}

.page-gioi-thieu-ung-dung__conclusion-content {
  text-align: center;
}

.page-gioi-thieu-ung-dung img {
  max-width: 100%;
  height: auto;
  display: block;
}

/* --- Mobile Responsive Styles (max-width: 768px) --- */
@media (max-width: 768px) {
  .page-gioi-thieu-ung-dung__container,
  .page-gioi-thieu-ung-dung__section,
  .page-gioi-thieu-ung-dung__card,
  .page-gioi-thieu-ung-dung__feature-item,
  .page-gioi-thieu-ung-dung__step-item,
  .page-gioi-thieu-ung-dung__step-card,
  .page-gioi-thieu-ung-dung__security-item,
  .page-gioi-thieu-ung-dung__support-item,
  .page-gioi-thieu-ung-dung__faq-item {
    padding-left: 15px !important;
    padding-right: 15px !important;
    max-width: 100% !important;
    width: 100% !important;
    box-sizing: border-box !important;
  }

  .page-gioi-thieu-ung-dung__hero-section {
    padding-top: 10px !important; /* Small top padding for mobile */
    padding-bottom: 30px;
  }

  .page-gioi-thieu-ung-dung__main-title {
    font-size: 2em;
    margin-bottom: 15px;
  }

  .page-gioi-thieu-ung-dung__description {
    font-size: 1em;
    margin-bottom: 25px;
  }

  .page-gioi-thieu-ung-dung__btn-primary,
  .page-gioi-thieu-ung-dung__btn-secondary,
  .page-gioi-thieu-ung-dung__btn-outline {
    max-width: 100% !important;
    width: 100% !important;
    margin: 10px 0 !important;
    padding: 15px 20px !important;
    font-size: 1.05em;
    white-space: normal !important;
    word-wrap: break-word !important;
    box-sizing: border-box !important;
  }

  .page-gioi-thieu-ung-dung__button-group {
    flex-direction: column;
    gap: 10px;
  }

  .page-gioi-thieu-ung-dung__section {
    padding: 40px 0;
  }

  .page-gioi-thieu-ung-dung__heading {
    font-size: 1.8em;
    margin-bottom: 30px;
  }

  .page-gioi-thieu-ung-dung__text-block {
    font-size: 0.95em;
  }

  .page-gioi-thieu-ung-dung__grid-3-cols,
  .page-gioi-thieu-ung-dung__feature-grid,
  .page-gioi-thieu-ung-dung__download-steps,
  .page-gioi-thieu-ung-dung__steps-list,
  .page-gioi-thieu-ung-dung__security-features,
  .page-gioi-thieu-ung-dung__support-channels {
    grid-template-columns: 1fr;
    gap: 20px;
  }

  .page-gioi-thieu-ung-dung__card,
  .page-gioi-thieu-ung-dung__feature-item,
  .page-gioi-thieu-ung-dung__step-item,
  .page-gioi-thieu-ung-dung__step-card,
  .page-gioi-thieu-ung-dung__security-item,
  .page-gioi-thieu-ung-dung__support-item {
    max-width: 100%;
    flex-basis: 100%;
    padding: 20px;
  }

  .page-gioi-thieu-ung-dung__card-image,
  .page-gioi-thieu-ung-dung__feature-icon,
  .page-gioi-thieu-ung-dung__step-image,
  .page-gioi-thieu-ung-dung__security-icon {
    min-height: 150px;
    min-width: 150px;
    height: auto !important;
    max-width: 100% !important;
    width: 100% !important;
  }

  .page-gioi-thieu-ung-dung__card-title,
  .page-gioi-thieu-ung-dung__feature-title,
  .page-gioi-thieu-ung-dung__step-title,
  .page-gioi-thieu-ung-dung__step-card-title,
  .page-gioi-thieu-ung-dung__security-title,
  .page-gioi-thieu-ung-dung__support-title {
    font-size: 1.3em;
  }

  .page-gioi-thieu-ung-dung__faq-question {
    padding: 15px 20px;
    font-size: 1em;
  }

  .page-gioi-thieu-ung-dung__faq-answer {
    padding: 0 20px 15px 20px;
    font-size: 0.9em;
  }

  .page-gioi-thieu-ung-dung img {
    max-width: 100% !important;
    height: auto !important;
    width: 100% !important;
  }
}

/* Placeholder for required CSS sections (even if empty for this page) */
.page-gioi-thieu-ung-dung__home-content { /* Non-homepage, so minimal style */ }
.page-gioi-thieu-ung-dung__row-games { /* Non-homepage */ }
.page-gioi-thieu-ung-dung__row-sport { /* Non-homepage */ }
.page-gioi-thieu-ung-dung__row-coop { /* Non-homepage */ }
.page-gioi-thieu-ung-dung__games-title { /* Non-homepage */ }
.page-gioi-thieu-ung-dung__sport-title { /* Non-homepage */ }
.page-gioi-thieu-ung-dung__coop-title { /* Non-homepage */ }
.page-gioi-thieu-ung-dung__slider-wrapper { /* Non-homepage */ }
.page-gioi-thieu-ung-dung__slider-track { /* Non-homepage */ }
.page-gioi-thieu-ung-dung__game-slide { /* Non-homepage */ }
.page-gioi-thieu-ung-dung__banners-top-wrapper { /* Non-homepage */ }
.page-gioi-thieu-ung-dung__banner-item img { /* Non-homepage */ }
.page-gioi-thieu-ung-dung__blog-masonry { /* Non-homepage */ }
.page-gioi-thieu-ung-dung__blog-card-link { /* Non-homepage */ }
.page-gioi-thieu-ung-dung__blog-slider-track { /* Non-homepage */ }
.page-gioi-thieu-ung-dung__blog-slide { /* Non-homepage */ }