.page-about {
  font-family: 'Arial', sans-serif;
  line-height: 1.6;
  color: #333333; /* Default text color for light body background */
  background-color: #F4F7FB; /* Body background from shared */
}

.page-about__hero-section {
  position: relative;
  padding-top: 10px; /* Small top padding, relying on body for header offset */
  margin-bottom: 40px;
  text-align: center;
  background-color: #F4F7FB;
}

.page-about__hero-image {
  width: 100%;
  height: auto;
  max-height: 600px;
  object-fit: cover;
  display: block;
}

.page-about__hero-content {
  max-width: 900px;
  margin: 20px auto 0 auto;
  padding: 0 20px 40px;
  box-sizing: border-box;
}

.page-about__main-title {
  font-size: clamp(2.2rem, 4vw, 3rem); /* Use clamp for H1 font-size */
  font-weight: 700;
  color: #1F2D3D;
  margin-bottom: 15px;
  line-height: 1.2;
}

.page-about__description {
  font-size: 1.1rem;
  color: #1F2D3D;
  margin-bottom: 30px;
  max-width: 800px;
  margin-left: auto;
  margin-right: auto;
}

.page-about__cta-buttons {
  display: flex;
  justify-content: center;
  gap: 20px;
  flex-wrap: wrap;
}

.page-about__btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 14px 30px;
  border-radius: 8px;
  text-decoration: none;
  font-weight: 600;
  font-size: 1rem;
  transition: all 0.3s ease;
  cursor: pointer;
  box-sizing: border-box;
  max-width: 100%;
  white-space: normal;
  word-wrap: break-word;
  text-align: center;
}

.page-about__btn-primary {
  background: linear-gradient(180deg, #4A8BFF 0%, #2F6BFF 100%);
  color: #ffffff;
  border: none;
  box-shadow: 0 4px 10px rgba(47, 107, 255, 0.3);
}

.page-about__btn-primary:hover {
  background: linear-gradient(180deg, #2F6BFF 0%, #4A8BFF 100%);
  box-shadow: 0 6px 15px rgba(47, 107, 255, 0.4);
}

.page-about__btn-secondary {
  background: #ffffff;
  color: #2F6BFF;
  border: 2px solid #2F6BFF;
  box-shadow: 0 4px 10px rgba(0, 0, 0, 0.1);
}

.page-about__btn-secondary:hover {
  background: #f0f5ff;
  color: #2F6BFF;
  box-shadow: 0 6px 15px rgba(0, 0, 0, 0.15);
}

.page-about__btn-link {
  display: inline-block;
  margin-top: 15px;
  color: #2F6BFF;
  text-decoration: none;
  font-weight: 600;
  transition: color 0.3s ease;
}

.page-about__btn-link:hover {
  text-decoration: underline;
  color: #4A8BFF;
}

.page-about__section {
  padding: 60px 0;
  margin-bottom: 20px;
  background-color: #ffffff;
  border-radius: 10px;
  box-shadow: 0 5px 15px rgba(0, 0, 0, 0.05);
}

.page-about__section:nth-of-type(even) {
  background-color: #fcfdff;
}

.page-about__dark-section {
  background: #2F6BFF;
  color: #ffffff;
  box-shadow: 0 5px 15px rgba(47, 107, 255, 0.3);
}

.page-about__section-title {
  font-size: clamp(1.8rem, 3.5vw, 2.5rem);
  color: #1F2D3D;
  text-align: center;
  margin-bottom: 40px;
  font-weight: 700;
}

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

.page-about__container {
  max-width: 1150px;
  margin: 0 auto;
  padding: 0 20px;
  box-sizing: border-box;
}

.page-about__content-flex {
  display: flex;
  align-items: flex-start;
  gap: 40px;
}

.page-about__content-flex--reverse {
  flex-direction: row-reverse;
}

.page-about__text-block {
  flex: 1;
}

.page-about__text-block h3 {
  font-size: 1.5rem;
  color: #1F2D3D;
  margin-top: 25px;
  margin-bottom: 15px;
}

.page-about__text-block p {
  margin-bottom: 15px;
  color: #333333;
}

.page-about__sub-title {
  font-size: 1.5rem;
  color: #1F2D3D;
  margin-top: 25px;
  margin-bottom: 15px;
}

.page-about__figure {
  flex: 1;
  margin: 0;
  text-align: center;
}

.page-about__image {
  max-width: 100%;
  height: auto;
  border-radius: 8px;
  display: block;
  margin: 0 auto;
}

.page-about__figcaption {
  font-size: 0.9rem;
  color: #666666;
  margin-top: 10px;
}

.page-about__value-grid, .page-about__feature-grid, .page-about__responsible-grid, .page-about__contact-methods {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 30px;
}

.page-about__value-card, .page-about__feature-card, .page-about__responsible-item, .page-about__contact-card {
  background: #ffffff;
  padding: 30px;
  border-radius: 10px;
  box-shadow: 0 2px 10px rgba(0, 0, 0, 0.05);
  text-align: center;
  border: 1px solid #D6E2FF;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
}

.page-about__dark-section .page-about__responsible-item {
  background: rgba(255, 255, 255, 0.1);
  color: #ffffff;
  border: 1px solid rgba(255, 255, 255, 0.2);
}

.page-about__dark-section .page-about__responsible-item h3 {
  color: #ffffff;
}

.page-about__value-title, .page-about__feature-title, .page-about__item-title, .page-about__contact-title {
  font-size: 1.3rem;
  color: #1F2D3D;
  margin-bottom: 15px;
  font-weight: 600;
}

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

.page-about__value-card p, .page-about__feature-card p, .page-about__responsible-item p, .page-about__contact-card p {
  font-size: 1rem;
  color: #333333;
  margin-bottom: 0;
}

.page-about__dark-section .page-about__description--light, .page-about__dark-section .page-about__responsible-item p {
  color: #e0e0e0;
}

.page-about__btn-primary--inverted {
  background: #ffffff;
  color: #2F6BFF;
  border: 2px solid #ffffff;
  box-shadow: 0 4px 10px rgba(255, 255, 255, 0.3);
}

.page-about__btn-primary--inverted:hover {
  background: #f0f5ff;
  color: #2F6BFF;
  box-shadow: 0 6px 15px rgba(255, 255, 255, 0.4);
}

.page-about__conclusion {
  text-align: center;
}

.page-about__conclusion .page-about__description {
  font-size: 1.1rem;
  max-width: 900px;
  margin-left: auto;
  margin-right: auto;
}

/* --- Responsive Styles --- */

@media (max-width: 1024px) {
  .page-about__content-flex {
    flex-direction: column;
    gap: 30px;
  }

  .page-about__figure {
    order: -1; /* Image appears above text on smaller screens */
    margin-bottom: 20px;
  }

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

  .page-about__container {
    padding: 0 15px;
  }

  .page-about__value-grid, .page-about__feature-grid, .page-about__responsible-grid, .page-about__contact-methods {
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  }
}

@media (max-width: 768px) {
  /* 1. 顶区标题 + 双 CTA */
  .page-about__hero-section {
    padding-top: 10px !important; /* Small top padding, relying on body for header offset */
  }
  .page-about__main-title {
    font-size: clamp(1.8rem, 8vw, 2.5rem);
    margin-bottom: 10px;
  }
  .page-about__description {
    font-size: 1rem;
    margin-bottom: 20px;
  }
  .page-about__cta-buttons {
    flex-direction: column;
    gap: 15px;
    padding: 0 15px;
  }

  /* 2. 单栏长文容器 */
  .page-about__section {
    padding: 40px 0;
  }
  .page-about__container {
    padding-left: 15px !important;
    padding-right: 15px !important;
    width: 100% !important;
    max-width: 100% !important;
    box-sizing: border-box !important;
  }
  .page-about__section-title {
    font-size: clamp(1.5rem, 7vw, 2rem);
    margin-bottom: 30px;
  }
  .page-about__text-block h3, .page-about__sub-title {
    font-size: 1.3rem;
    margin-top: 20px;
    margin-bottom: 10px;
  }
  .page-about__text-block p {
    font-size: 0.95rem;
    margin-bottom: 10px;
  }

  /* 3. 通用图片与 figure */
  .page-about img {
    max-width: 100% !important;
    width: 100% !important;
    height: auto !important;
    display: block !important;
    box-sizing: border-box !important;
  }
  .page-about__figure {
    width: 100% !important;
    max-width: 100% !important;
    box-sizing: border-box !important;
    margin: 0 auto 20px auto !important;
  }
  .page-about__figcaption {
    font-size: 0.85rem;
  }

  /* 4. 按钮与按钮容器 */
  .page-about__btn,
  .page-about__btn-primary,
  .page-about__btn-secondary,
  .page-about a[class*="button"],
  .page-about 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 !important;
    padding-right: 15px !important;
    margin: 0 auto;
  }
  .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;
    gap: 10px;
  }
  .page-about__cta-buttons {
    flex-direction: column !important;
  }
  .page-about__btn-link {
    margin-top: 10px;
  }

  /* 5. 信息卡片/网格布局 (替代注册教程/FAQ区块，因为这是About Us) */
  .page-about__value-grid, .page-about__feature-grid, .page-about__responsible-grid, .page-about__contact-methods {
    grid-template-columns: 1fr;
    gap: 20px;
  }
  .page-about__value-card, .page-about__feature-card, .page-about__responsible-item, .page-about__contact-card {
    padding: 20px;
  }
  .page-about__dark-section .page-about__description--light, .page-about__dark-section .page-about__responsible-item p {
    font-size: 0.95rem;
  }
}