.page-about {
  width: 100%;
  max-width: var(--content-max-width, 1120px);
  margin: 0 auto;
  padding: 2rem 1rem;
  box-sizing: border-box;
}

/* 面包屑 */
.page-about .breadcrumb {
  font: var(--font-caption);
  color: var(--color-metal-gray);
  margin-bottom: 1.5rem;
}
.page-about .breadcrumb a {
  color: var(--color-accent);
  text-decoration: none;
}
.page-about .breadcrumb a:hover {
  text-decoration: underline;
}
.page-about .breadcrumb [aria-current="page"] {
  color: var(--color-text-primary);
  font-weight: 600;
}

/* 页面主标题 */
.page-about__title {
  font: var(--font-heading);
  letter-spacing: var(--letter-spacing-heading);
  color: var(--color-primary-variant);
  margin: 0 0 2rem 0;
  padding-bottom: 0.5rem;
  border-bottom: var(--border-print);
}

/* 所有section通用 */
.page-about__section {
  margin-bottom: 3rem;
}
.section-title {
  font: var(--font-heading);
  font-size: 1.5rem;
  letter-spacing: var(--letter-spacing-heading);
  color: var(--color-primary);
  margin: 0 0 1rem 0;
}

/* ----- 品牌定位 ----- */
.page-about__position {
  position: relative;
  display: flex;
  align-items: center;
  gap: 2rem;
}
.page-about__position-bg {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  pointer-events: none;
  overflow: hidden;
  z-index: 0;
}
.page-about__position-image {
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: 0.08;
}
.page-about__position-content {
  position: relative;
  z-index: 1;
  flex: 1;
}
.page-about__position-content .card__text {
  font: var(--font-body);
  color: var(--color-text-primary);
  margin-bottom: 0.8rem;
}
/* 窄屏下背景图隐藏 */
@media (max-width: 640px) {
  .page-about__position-bg {
    display: none;
  }
}

/* ----- 发展历程 ----- */
.page-about__timeline {
  text-align: center;
}
.page-about__timeline-image {
  width: 100%;
  max-width: 900px;
  height: auto;
  object-fit: cover;
  border-radius: 4px;
  margin: 0 auto 2rem auto;
  display: block;
  box-shadow: var(--shadow-card);
}
.page-about__timeline-list {
  list-style: none;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
  align-items: flex-start;
  max-width: 600px;
  margin: 0 auto;
}
.page-about__timeline-node {
  display: flex;
  gap: 1rem;
  align-items: flex-start;
  width: 100%;
  padding: 0.8rem 1rem;
  border-left: 3px solid var(--color-accent);
  transition: background var(--transition-standard);
  cursor: default;
}
.page-about__timeline-node:hover,
.page-about__timeline-node:focus-visible {
  background: var(--color-neutral-light);
  border-left-color: var(--color-primary-variant);
}
.page-about__node-dot {
  flex-shrink: 0;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--color-accent);
  margin-top: 4px;
  border: 2px solid var(--color-surface);
  box-shadow: 0 0 0 2px var(--color-accent);
}
.page-about__node-content {
  flex: 1;
}
.page-about__node-heading {
  font: var(--font-heading);
  font-size: 1.1rem;
  margin: 0 0 0.25rem 0;
  color: var(--color-primary-variant);
}
.page-about__node-desc {
  font: var(--font-body);
  color: var(--color-neutral-dark);
  margin: 0;
}
/* 悬停显示说明：使用title属性已实现，额外保留样式 */

/* 窄屏下时间轴图片保留，列表正常 */
@media (max-width: 640px) {
  .page-about__timeline-node {
    padding-left: 0.6rem;
  }
}

/* ----- 服务特色 ----- */
.page-about__features-wrapper {
  display: flex;
  gap: 2rem;
  align-items: flex-start;
}
.page-about__features-cards {
  flex: 1;
  display: flex;
  flex-direction: column;
  gap: 1rem;
}
.page-about__feature-item {
  margin: 0;
}
.page-about__feature-item .card__label {
  display: inline-block;
  background: var(--color-primary);
  color: var(--color-text-on-dark);
  padding: 0.2rem 0.8rem;
  border-radius: 2px;
  font: var(--font-caption);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: 0.5rem;
}
.page-about__feature-item .card__text {
  font: var(--font-body);
  color: var(--color-text-primary);
}
.page-about__features-side {
  flex-shrink: 0;
  align-self: flex-end;
}
.page-about__runner {
  display: block;
  width: 200px;
  height: auto;
  object-fit: contain;
}
/* 窄屏下侧边图片隐藏或缩小 */
@media (max-width: 768px) {
  .page-about__features-wrapper {
    flex-direction: column;
  }
  .page-about__features-side {
    align-self: center;
    margin-top: 1rem;
  }
  .page-about__runner {
    width: 120px;
    height: auto;
  }
}

/* ----- 相关链接 ----- */
.page-about__related {
  margin-top: 3rem;
  padding-top: 2rem;
  border-top: var(--border-print);
}
.page-about__link-list {
  list-style: none;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 1.5rem;
}
.page-about__link-list .main-nav__link {
  font: var(--font-body);
  color: var(--color-accent);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: border-color var(--transition-standard);
}
.page-about__link-list .main-nav__link:hover {
  border-bottom-color: var(--color-accent);
}

/* 全局卡片样式补丁（在作用域内） */
.page-about .card {
  background: var(--color-surface);
  border: var(--border-print);
  border-radius: 4px;
  padding: 1.2rem 1.5rem;
  box-shadow: var(--shadow-card);
  position: relative;
}

/* 移动端优先通用调整 */
@media (max-width: 480px) {
  .page-about {
    padding: 1rem 0.5rem;
  }
  .page-about__title {
    font-size: 1.6rem;
  }
  .page-about__position {
    flex-direction: column;
  }
  .page-about__timeline-image {
    max-width: 100%;
  }
  .page-about__link-list {
    flex-direction: column;
    gap: 0.8rem;
  }
}