.page-index-gioi-thieu-nen-tang {
  font-family: Arial, sans-serif;
  line-height: 1.6;
  color: #1F2D3D; /* Text Main */
  background-color: #F4F7FB; /* Background */
}

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

.page-index-gioi-thieu-nen-tang__hero-section {
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  padding-bottom: 40px;
  padding-top: 10px; /* Small top padding as per rules */
  background-color: #F4F7FB; /* Light background for hero section */
  color: #1F2D3D;
}

.page-index-gioi-thieu-nen-tang__hero-image-wrap {
  width: 100%;
  max-width: 100%;
  overflow: hidden;
  box-sizing: border-box;
  margin-bottom: 30px;
}

.page-index-gioi-thieu-nen-tang__hero-image {
  width: 100%;
  height: auto;
  display: block;
  object-fit: cover;
}

.page-index-gioi-thieu-nen-tang__hero-content {
  max-width: 800px;
  padding: 0 20px;
}

.page-index-gioi-thieu-nen-tang__main-title {
  font-size: 2.8em;
  font-weight: 700;
  margin-bottom: 20px;
  color: #1F2D3D; /* Text Main */
  line-height: 1.2;
}

.page-index-gioi-thieu-nen-tang__lead-paragraph {
  font-size: 1.1em;
  margin-bottom: 30px;
  color: #1F2D3D;
}

.page-index-gioi-thieu-nen-tang__cta-buttons {
  display: flex;
  justify-content: center;
  gap: 15px;
  flex-wrap: wrap;
}

.page-index-gioi-thieu-nen-tang__btn {
  padding: 14px 28px;
  border-radius: 8px;
  text-decoration: none;
  font-weight: 600;
  font-size: 1.05em;
  transition: all 0.3s ease;
  white-space: normal;
  word-wrap: break-word;
  box-sizing: border-box;
  text-align: center;
}

.page-index-gioi-thieu-nen-tang__btn-primary {
  background: linear-gradient(180deg, #4A8BFF 0%, #2F6BFF 100%);
  color: #ffffff;
  border: none;
}

.page-index-gioi-thieu-nen-tang__btn-primary:hover {
  opacity: 0.9;
  transform: translateY(-2px);
}

.page-index-gioi-thieu-nen-tang__btn-secondary {
  background: #FFFFFF;
  color: #2F6BFF;
  border: 2px solid #2F6BFF;
}

.page-index-gioi-thieu-nen-tang__btn-secondary:hover {
  background: #2F6BFF;
  color: #FFFFFF;
}

.page-index-gioi-thieu-nen-tang__section {
  padding: 60px 0;
}

.page-index-gioi-thieu-nen-tang__section-title {
  font-size: 2.2em;
  font-weight: 700;
  text-align: center;
  margin-bottom: 40px;
  color: #1F2D3D; /* Text Main */
}

.page-index-gioi-thieu-nen-tang__section-title--white {
  color: #ffffff;
}

.page-index-gioi-thieu-nen-tang__text-block {
  font-size: 1.05em;
  margin-bottom: 20px;
  color: #1F2D3D;
}

.page-index-gioi-thieu-nen-tang__text-block--white {
  color: #ffffff;
}

.page-index-gioi-thieu-nen-tang__highlight {
  color: #2F6BFF;
  font-weight: bold;
}

.page-index-gioi-thieu-nen-tang__dark-bg {
  background-color: #2F6BFF;
  color: #ffffff;
}

.page-index-gioi-thieu-nen-tang__light-bg {
  background-color: #F4F7FB;
  color: #1F2D3D;
}

.page-index-gioi-thieu-nen-tang__figure {
  margin: 30px auto;
  text-align: center;
  max-width: 680px;
}

.page-index-gioi-thieu-nen-tang__figure--center {
  display: block;
  margin-left: auto;
  margin-right: auto;
}

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

.page-index-gioi-thieu-nen-tang__figcaption {
  font-size: 0.9em;
  color: #666;
  margin-top: 10px;
}

.page-index-gioi-thieu-nen-tang__inline-link {
  color: #2F6BFF;
  text-decoration: underline;
}

.page-index-gioi-thieu-nen-tang__inline-link--white {
  color: #A5C4FF;
}

/* Features Section */
.page-index-gioi-thieu-nen-tang__features {
  background-color: #2F6BFF; /* Main color */
  color: #ffffff;
}

.page-index-gioi-thieu-nen-tang__feature-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 30px;
}

.page-index-gioi-thieu-nen-tang__feature-card {
  background-color: rgba(255, 255, 255, 0.1);
  padding: 30px;
  border-radius: 12px;
  text-align: center;
  box-shadow: 0 5px 20px rgba(0, 0, 0, 0.2);
  display: flex;
  flex-direction: column;
  align-items: center;
}

.page-index-gioi-thieu-nen-tang__feature-icon {
  width: 100%;
  max-width: 200px;
  height: auto;
  margin-bottom: 20px;
  border-radius: 8px;
}

.page-index-gioi-thieu-nen-tang__feature-title {
  font-size: 1.5em;
  margin-bottom: 15px;
  color: #ffffff;
}

.page-index-gioi-thieu-nen-tang__feature-description {
  font-size: 1em;
  color: #f0f0f0;
}

/* Benefits Section */
.page-index-gioi-thieu-nen-tang__benefits {
  background-color: #F4F7FB;
  color: #1F2D3D;
}

.page-index-gioi-thieu-nen-tang__benefit-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 30px;
}

.page-index-gioi-thieu-nen-tang__benefit-card {
  background-color: #FFFFFF;
  padding: 30px;
  border-radius: 12px;
  box-shadow: 0 2px 10px rgba(0, 0, 0, 0.08);
}

.page-index-gioi-thieu-nen-tang__benefit-title {
  font-size: 1.4em;
  margin-bottom: 15px;
  color: #2F6BFF;
}

.page-index-gioi-thieu-nen-tang__benefit-description {
  font-size: 1em;
  color: #1F2D3D;
}

/* Guide Section */
.page-index-gioi-thieu-nen-tang__guide-steps {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 25px;
  margin-bottom: 40px;
}

.page-index-gioi-thieu-nen-tang__step-card {
  background-color: #FFFFFF;
  padding: 25px;
  border-radius: 12px;
  box-shadow: 0 2px 10px rgba(0, 0, 0, 0.08);
  text-align: center;
}

.page-index-gioi-thieu-nen-tang__step-number {
  font-size: 2.5em;
  font-weight: 700;
  color: #2F6BFF;
  margin-bottom: 15px;
}

.page-index-gioi-thieu-nen-tang__step-title {
  font-size: 1.3em;
  margin-bottom: 10px;
  color: #1F2D3D;
}

.page-index-gioi-thieu-nen-tang__step-description {
  font-size: 0.95em;
  color: #1F2D3D;
}

/* Commitment Section */
.page-index-gioi-thieu-nen-tang__commitment {
  background-color: #2F6BFF;
  color: #ffffff;
}

/* Final CTA Section */
.page-index-gioi-thieu-nen-tang__cta-final {
  background-color: #F4F7FB;
  color: #1F2D3D;
}

.page-index-gioi-thieu-nen-tang__cta-container--center {
  text-align: center;
}

/* --- Mobile Responsive Styles (max-width: 768px) --- */
@media (max-width: 768px) {
  .page-index-gioi-thieu-nen-tang {
    font-size: 16px;
    line-height: 1.6;
  }

  /* 1. 顶区标题 + 双 CTA */
  .page-index-gioi-thieu-nen-tang__hero-section {
    padding-top: 10px !important;
    padding-bottom: 30px;
  }

  .page-index-gioi-thieu-nen-tang__main-title {
    font-size: clamp(1.8em, 5vw, 2.5em); /* Using clamp as allowed if must restrict */
    margin-bottom: 15px;
  }

  .page-index-gioi-thieu-nen-tang__lead-paragraph {
    font-size: 1em;
    margin-bottom: 25px;
  }

  .page-index-gioi-thieu-nen-tang__cta-buttons {
    flex-direction: column;
    gap: 10px;
    padding-left: 15px;
    padding-right: 15px;
    width: 100%;
    max-width: 100%;
    box-sizing: border-box;
  }

  /* 4. 按钮与按钮容器 */
  .page-index-gioi-thieu-nen-tang__btn,
  .page-index-gioi-thieu-nen-tang__btn-primary,
  .page-index-gioi-thieu-nen-tang__btn-secondary,
  .page-index-gioi-thieu-nen-tang a[class*="button"],
  .page-index-gioi-thieu-nen-tang 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;
  }

  .page-index-gioi-thieu-nen-tang__cta-buttons,
  .page-index-gioi-thieu-nen-tang__button-group,
  .page-index-gioi-thieu-nen-tang__btn-container {
    max-width: 100% !important;
    width: 100% !important;
    box-sizing: border-box !important;
    padding-left: 15px;
    padding-right: 15px;
    flex-wrap: wrap !important;
    gap: 10px;
  }

  /* 2. 单栏长文容器 */
  .page-index-gioi-thieu-nen-tang__container {
    padding: 0 15px;
    width: 100%;
    max-width: 100%;
    box-sizing: border-box;
  }

  .page-index-gioi-thieu-nen-tang__section {
    padding: 40px 0;
  }

  .page-index-gioi-thieu-nen-tang__section-title {
    font-size: 1.8em;
    margin-bottom: 30px;
  }

  .page-index-gioi-thieu-nen-tang__text-block {
    font-size: 0.95em;
  }

  /* 3. 通用图片与 figure */
  .page-index-gioi-thieu-nen-tang img {
    max-width: 100% !important;
    width: 100% !important;
    height: auto !important;
    display: block !important;
  }
  
  .page-index-gioi-thieu-nen-tang__figure {
    margin: 20px auto;
  }

  .page-index-gioi-thieu-nen-tang__feature-grid,
  .page-index-gioi-thieu-nen-tang__benefit-grid,
  .page-index-gioi-thieu-nen-tang__guide-steps {
    grid-template-columns: 1fr;
    gap: 20px;
  }

  .page-index-gioi-thieu-nen-tang__feature-card,
  .page-index-gioi-thieu-nen-tang__benefit-card,
  .page-index-gioi-thieu-nen-tang__step-card {
    padding: 20px;
  }

  .page-index-gioi-thieu-nen-tang__feature-icon {
    max-width: 150px;
  }

  .page-index-gioi-thieu-nen-tang__feature-title {
    font-size: 1.3em;
  }

  .page-index-gioi-thieu-nen-tang__benefit-title,
  .page-index-gioi-thieu-nen-tang__step-title {
    font-size: 1.2em;
  }

  /* 5. 注册教程与 FAQ 区块 (Guide section is the tutorial) */
  .page-index-gioi-thieu-nen-tang__step-number {
    font-size: 2em;
  }
}

/* Ensure image color filters are not used */
.page-index-gioi-thieu-nen-tang img {
  filter: none; /* Explicitly ensure no filters */
}

.page-index-gioi-thieu-nen-tang__hero-image {
  width: 100%; /* Ensure width is 100% for the actual image, not just max-width */
  height: auto;
}