.page-index-gioi-thieu-tong-quan {
  font-family: 'Arial', sans-serif;
  color: #333333; /* Default dark text for light body background */
  background-color: #FFFFFF; /* Assuming shared body background is light */
  line-height: 1.6;
}

.page-index-gioi-thieu-tong-quan__container {
  max-width: 1150px;
  margin: 0 auto;
  padding: 0 20px;
  box-sizing: border-box;
}

.page-index-gioi-thieu-tong-quan__container--wide {
  max-width: 100%;
  padding: 0;
}

.page-index-gioi-thieu-tong-quan__top-section {
  padding-top: 10px; /* Small top padding, body handles header offset */
  padding-bottom: 40px;
  text-align: center;
  background-color: #FFFFFF;
}

.page-index-gioi-thieu-tong-quan__main-title {
  font-size: clamp(2em, 4vw, 3.2em); /* Responsive H1 font size */
  color: #26A9E0;
  margin-bottom: 20px;
  font-weight: 700;
  line-height: 1.2;
  max-width: 900px;
  margin-left: auto;
  margin-right: auto;
}

.page-index-gioi-thieu-tong-quan__description {
  font-size: 1.1em;
  max-width: 800px;
  margin: 0 auto 30px auto;
  color: #555555;
}

.page-index-gioi-thieu-tong-quan__cta-buttons {
  display: flex;
  justify-content: center;
  gap: 15px;
  margin-top: 20px;
  flex-wrap: wrap;
}

.page-index-gioi-thieu-tong-quan__cta-buttons--center {
  margin-top: 40px;
}

.page-index-gioi-thieu-tong-quan__btn {
  display: inline-block;
  padding: 12px 25px;
  border-radius: 8px;
  text-decoration: none;
  font-weight: 600;
  font-size: 1em;
  transition: all 0.3s ease;
  box-sizing: border-box;
  text-align: center;
  white-space: normal;
  word-wrap: break-word;
  max-width: 280px; /* Limit button width for desktop */
}

.page-index-gioi-thieu-tong-quan__btn--primary {
  background-color: #26A9E0;
  color: #ffffff;
  border: 2px solid #26A9E0;
}

.page-index-gioi-thieu-tong-quan__btn--primary:hover {
  background-color: #1e87b3;
  border-color: #1e87b3;
}

.page-index-gioi-thieu-tong-quan__btn--secondary {
  background-color: #ffffff;
  color: #26A9E0;
  border: 2px solid #26A9E0;
}

.page-index-gioi-thieu-tong-quan__btn--secondary:hover {
  background-color: #e0f2f7;
  color: #1e87b3;
  border-color: #1e87b3;
}

.page-index-gioi-thieu-tong-quan__btn--inline {
  display: block;
  width: fit-content;
  margin-top: 15px;
  margin-bottom: 25px;
  padding: 8px 15px;
  font-size: 0.9em;
  background-color: transparent;
  color: #26A9E0;
  border: 1px solid #26A9E0;
  border-radius: 5px;
  text-decoration: none;
  transition: all 0.3s ease;
}

.page-index-gioi-thieu-tong-quan__btn--inline:hover {
  background-color: #26A9E0;
  color: #ffffff;
}

.page-index-gioi-thieu-tong-quan__section {
  padding: 60px 0;
  background-color: #f9f9f9;
  border-bottom: 1px solid #eeeeee;
}

.page-index-gioi-thieu-tong-quan__section:nth-of-type(even) {
  background-color: #ffffff;
}

.page-index-gioi-thieu-tong-quan__section-title {
  font-size: 2.2em;
  color: #26A9E0;
  text-align: center;
  margin-bottom: 30px;
  font-weight: 700;
}

.page-index-gioi-thieu-tong-quan__sub-title {
  font-size: 1.6em;
  color: #333333;
  margin-top: 35px;
  margin-bottom: 15px;
  font-weight: 600;
  border-left: 4px solid #26A9E0;
  padding-left: 10px;
}

.page-index-gioi-thieu-tong-quan__text-block {
  font-size: 1.05em;
  line-height: 1.7;
  margin-bottom: 20px;
  color: #555555;
}

.page-index-gioi-thieu-tong-quan__figure {
  margin: 30px 0;
  text-align: center;
}

.page-index-gioi-thieu-tong-quan__image {
  max-width: 100%;
  height: auto;
  border-radius: 8px;
  box-shadow: 0 4px 15px rgba(0, 0, 0, 0.1);
  display: block;
  margin: 0 auto;
}

.page-index-gioi-thieu-tong-quan__figcaption {
  font-size: 0.9em;
  color: #777777;
  margin-top: 10px;
  font-style: italic;
}

.page-index-gioi-thieu-tong-quan__list {
  list-style: disc;
  margin-left: 25px;
  margin-bottom: 20px;
  color: #555555;
}

.page-index-gioi-thieu-tong-quan__list-item {
  margin-bottom: 8px;
  font-size: 1.05em;
}

.page-index-gioi-thieu-tong-quan__feature-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 30px;
  margin-top: 40px;
}

.page-index-gioi-thieu-tong-quan__feature-card {
  background-color: #ffffff;
  border-radius: 10px;
  padding: 30px;
  text-align: center;
  box-shadow: 0 5px 20px rgba(0, 0, 0, 0.08);
  transition: transform 0.3s ease, box-shadow 0.3s ease;
  display: flex;
  flex-direction: column;
  align-items: center;
}

.page-index-gioi-thieu-tong-quan__feature-card:hover {
  transform: translateY(-5px);
  box-shadow: 0 8px 25px rgba(0, 0, 0, 0.15);
}

.page-index-gioi-thieu-tong-quan__feature-icon {
  width: 100px;
  height: 100px;
  object-fit: contain;
  margin-bottom: 20px;
}

.page-index-gioi-thieu-tong-quan__feature-title {
  font-size: 1.3em;
  color: #26A9E0;
  margin-bottom: 10px;
  font-weight: 600;
}

.page-index-gioi-thieu-tong-quan__feature-text {
  font-size: 0.95em;
  color: #666666;
  line-height: 1.6;
}

/* Mobile responsive styles */
@media (max-width: 1024px) {
  .page-index-gioi-thieu-tong-quan__main-title {
    font-size: clamp(2em, 5vw, 2.8em);
  }

  .page-index-gioi-thieu-tong-quan__section-title {
    font-size: 2em;
  }

  .page-index-gioi-thieu-tong-quan__sub-title {
    font-size: 1.4em;
  }

  .page-index-gioi-thieu-tong-quan__feature-grid {
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 20px;
  }

  .page-index-gioi-thieu-tong-quan__btn {
    padding: 10px 20px;
    font-size: 0.95em;
  }
}

@media (max-width: 768px) {
  /* 1. Top section title + dual CTA */
  .page-index-gioi-thieu-tong-quan__top-section {
    padding-top: 10px !important; /* Small top padding, body handles header offset */
    padding-bottom: 30px;
  }

  .page-index-gioi-thieu-tong-quan__main-title {
    font-size: clamp(1.8em, 7vw, 2.5em) !important;
    margin-bottom: 15px;
  }

  .page-index-gioi-thieu-tong-quan__description {
    font-size: 1em;
    margin-bottom: 25px;
    padding: 0 15px;
  }

  .page-index-gioi-thieu-tong-quan__cta-buttons {
    flex-direction: column !important;
    gap: 10px;
    padding: 0 15px;
  }

  /* 4. Buttons and button containers */
  .page-index-gioi-thieu-tong-quan__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;
  }

  .page-index-gioi-thieu-tong-quan__btn--inline {
    width: 100% !important;
    text-align: center;
    padding-left: 15px;
    padding-right: 15px;
  }

  /* 2. Single-column article wrap */
  .page-index-gioi-thieu-tong-quan__container {
    padding: 0 15px !important;
    max-width: 100% !important;
    width: 100% !important;
    box-sizing: border-box !important;
  }

  .page-index-gioi-thieu-tong-quan__section {
    padding: 30px 0;
  }

  .page-index-gioi-thieu-tong-quan__section-title {
    font-size: 1.8em;
    margin-bottom: 20px;
  }

  .page-index-gioi-thieu-tong-quan__sub-title {
    font-size: 1.2em;
    margin-top: 25px;
    margin-bottom: 10px;
    padding-left: 8px;
  }

  .page-index-gioi-thieu-tong-quan__text-block,
  .page-index-gioi-thieu-tong-quan__list-item {
    font-size: 0.95em;
  }

  /* 3. General images and figure */
  .page-index-gioi-thieu-tong-quan__image {
    max-width: 100% !important;
    width: 100% !important;
    height: auto !important;
    display: block !important;
    border-radius: 5px;
  }

  .page-index-gioi-thieu-tong-quan__figcaption {
    font-size: 0.85em;
  }

  .page-index-gioi-thieu-tong-quan__feature-grid {
    grid-template-columns: 1fr;
    gap: 20px;
    margin-top: 20px;
  }

  .page-index-gioi-thieu-tong-quan__feature-card {
    padding: 20px;
  }

  .page-index-gioi-thieu-tong-quan__feature-icon {
    width: 80px;
    height: 80px;
    margin-bottom: 15px;
  }

  .page-index-gioi-thieu-tong-quan__feature-title {
    font-size: 1.1em;
  }

  .page-index-gioi-thieu-tong-quan__feature-text {
    font-size: 0.9em;
  }

  /* 5. Registration tutorial and FAQ block (general content blocks) */
  .page-index-gioi-thieu-tong-quan__section--guide .page-index-gioi-thieu-tong-quan__sub-title {
    font-size: 1.3em;
    margin-top: 20px;
  }
}