.page-about {
  font-family: Arial, sans-serif;
  color: #333333; /* Default dark text for light body background */
  line-height: 1.6;
}

.page-about__container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 20px;
  box-sizing: border-box;
}

.page-about__hero-section {
  position: relative;
  text-align: center;
  background-color: #f0f8ff;
  padding-top: 10px; /* Small top padding, body handles --header-offset */
}

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

.page-about__hero-content {
  padding: 40px 20px;
  background-color: #ffffff; /* Ensure readability */
  margin-top: -5px; /* Slight overlap for visual continuity */
  position: relative;
  z-index: 1;
  box-shadow: 0 4px 10px rgba(0, 0, 0, 0.05);
}

.page-about__main-title {
  font-size: clamp(2em, 4vw, 3.5em);
  color: #26A9E0;
  margin-bottom: 20px;
  font-weight: bold;
  line-height: 1.2;
  letter-spacing: -0.5px;
}

.page-about__description {
  font-size: 1.1em;
  margin-bottom: 30px;
  max-width: 800px;
  margin-left: auto;
  margin-right: auto;
  color: #555555;
}

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

.page-about__cta-buttons--center {
  margin-top: 30px;
}

.page-about__btn {
  display: inline-block;
  padding: 14px 30px;
  border-radius: 8px;
  text-decoration: none;
  font-weight: bold;
  font-size: 1.05em;
  transition: background-color 0.3s ease, transform 0.2s ease;
  max-width: 100%;
  box-sizing: border-box;
  white-space: normal;
  word-wrap: break-word;
  text-align: center;
}

.page-about__btn--primary {
  background-color: #26A9E0;
  color: #ffffff;
  border: 2px solid #26A9E0;
}

.page-about__btn--primary:hover {
  background-color: #1e87c0;
  transform: translateY(-2px);
}

.page-about__btn--secondary {
  background-color: #ffffff;
  color: #26A9E0;
  border: 2px solid #26A9E0;
}

.page-about__btn--secondary:hover {
  background-color: #f0f8ff;
  transform: translateY(-2px);
}

.page-about__section {
  padding: 60px 0;
  text-align: center;
}

.page-about__dark-section {
  background-color: #26A9E0;
  color: #ffffff;
}

.page-about__dark-section .page-about__section-title,
.page-about__dark-section .page-about__description,
.page-about__dark-section p {
  color: #ffffff;
}

.page-about__section-title {
  font-size: 2.5em;
  color: #26A9E0;
  margin-bottom: 40px;
  font-weight: bold;
}

.page-about__dark-section .page-about__section-title {
  color: #ffffff;
}

.page-about__content-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 30px;
  align-items: center;
  text-align: left;
}

.page-about__text-block {
  padding: 20px;
  background-color: #ffffff;
  border-radius: 10px;
  box-shadow: 0 2px 10px rgba(0, 0, 0, 0.08);
}

.page-about__dark-section .page-about__text-block {
  background-color: rgba(255, 255, 255, 0.1);
  color: #ffffff;
}

.page-about__dark-section .page-about__text-block p {
  color: #ffffff;
}

.page-about__text-block h3 {
  color: #26A9E0;
  font-size: 1.8em;
  margin-bottom: 15px;
}

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

.page-about__feature-card {
  background-color: #ffffff;
  padding: 30px;
  border-radius: 10px;
  box-shadow: 0 4px 15px rgba(0, 0, 0, 0.1);
  text-align: left;
  transition: transform 0.3s ease;
  border-top: 5px solid #26A9E0;
}

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

.page-about__card-title {
  font-size: 1.5em;
  color: #26A9E0;
  margin-bottom: 15px;
  font-weight: bold;
}

.page-about__feature-card p {
  color: #555555;
  font-size: 1em;
}

.page-about__content-image {
  max-width: 100%;
  height: auto;
  display: block;
  margin: 30px auto;
  border-radius: 8px;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
}

.page-about__content-image--center {
  margin-left: auto;
  margin-right: auto;
}

.page-about__promo-box {
  background-color: #e6f7ff;
  padding: 50px 0;
  border-radius: 15px;
  margin: 40px auto;
  max-width: 1100px;
  box-shadow: 0 6px 20px rgba(0, 0, 0, 0.08);
}

/* Ensure all images are responsive by default */
.page-about img {
  max-width: 100%;
  height: auto;
  display: block;
}

/* Mobile responsiveness */
@media (max-width: 768px) {
  .page-about {
    font-size: 16px;
    line-height: 1.6;
  }

  .page-about__container {
    padding-left: 15px;
    padding-right: 15px;
    max-width: 100% !important;
    width: 100% !important;
    box-sizing: border-box !important;
  }

  /* 1. 顶区标题 + 双 CTA */
  .page-about__hero-section {
    padding-top: 10px !important;
  }

  .page-about__hero-content {
    padding: 30px 15px;
  }

  .page-about__main-title {
    font-size: clamp(1.8em, 8vw, 2.5em);
    margin-bottom: 15px;
  }

  .page-about__description {
    font-size: 1em;
    margin-bottom: 20px;
  }

  .page-about__cta-buttons {
    flex-direction: column;
    gap: 10px;
  }

  .page-about__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;
  }

  /* 2. 单栏长文容器 */
  .page-about__section {
    padding: 40px 0;
  }

  .page-about__section-title {
    font-size: 2em;
    margin-bottom: 30px;
  }

  .page-about__text-block {
    padding: 15px;
  }

  .page-about__text-block h3 {
    font-size: 1.5em;
  }

  .page-about__features-grid {
    grid-template-columns: 1fr;
    gap: 20px;
  }

  .page-about__feature-card {
    padding: 25px;
  }

  .page-about__card-title {
    font-size: 1.3em;
  }

  .page-about__promo-box {
    padding: 30px 15px;
    margin: 30px 15px;
  }

  /* 3. 通用图片与 figure */
  .page-about img {
    max-width: 100% !important;
    width: 100% !important;
    height: auto !important;
  }

  /* 4. 按钮与按钮容器 - Already handled by .page-about__btn and .page-about__cta-buttons */
  /* Ensure containers for buttons are also responsive */
  .page-about__cta-buttons,
  .page-about__button-group,
  .page-about__btn-container {
    max-width: 100% !important;
    width: 100% !important;
    box-sizing: border-box !important;
    padding-left: 15px;
    padding-right: 15px;
    flex-wrap: wrap !important; /* For multiple buttons in a row */
    gap: 10px;
  }
  .page-about__cta-buttons {
    flex-direction: column; /* Stack buttons vertically on mobile */
  }

  /* 5. 注册教程与 FAQ 区块 - Not explicitly in this about page, but general text blocks are covered */
  .page-about p,
  .page-about li {
    font-size: 1em;
    line-height: 1.5;
  }

  /* Generic section/card/container for mobile */
  .page-about__section,
  .page-about__card,
  .page-about__container,
  .page-about__text-block,
  .page-about__feature-card,
  .page-about__promo-box {
    max-width: 100% !important;
    width: 100% !important;
    box-sizing: border-box !important;
    padding-left: 15px;
    padding-right: 15px;
  }
}