.page-about {
  background-color: var(--color-cream);
  padding-bottom: 4rem;
}

/* 面包屑 */
.page-about .breadcrumb {
  font-family: var(--font-body);
  font-size: 0.875rem;
  color: var(--color-gray);
  margin-bottom: 1rem;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}
.page-about .breadcrumb a {
  color: var(--color-green);
  text-decoration: none;
  transition: color 0.2s;
}
.page-about .breadcrumb a:hover {
  color: var(--color-purple);
}
.page-about .breadcrumb-sep {
  color: var(--color-border);
}
.page-about .breadcrumb [aria-current="page"] {
  color: var(--color-dark);
  font-weight: 600;
}

/* 页面标题 */
.page-about .page-title {
  font-family: var(--font-heading);
  font-weight: 800;
  font-size: 3rem;
  color: var(--color-dark);
  margin: 2rem 0 3rem;
  text-align: center;
  position: relative;
}
.page-about .page-title::after {
  content: '';
  display: block;
  width: 80px;
  height: 4px;
  background: var(--color-gold);
  margin: 1rem auto 0;
  border-radius: 2px;
}

/* 章节容器 */
.page-about .chapter {
  position: relative;
  padding: 4rem 0;
  overflow: hidden;
}

/* 章节内部 flex 容器 */
.page-about .chapter-inner {
  display: flex;
  align-items: flex-start;
  gap: 2rem;
  flex-wrap: wrap;
  position: relative;
  z-index: 1;
}

/* 大编号：绝对定位，半透明金色重叠 */
.page-about .chapter__number {
  position: absolute;
  top: 1.5rem;
  left: clamp(1rem, 6vw, 4rem);
  font-family: var(--font-heading);
  font-weight: 800;
  font-size: clamp(4rem, 15vw, 10rem);
  color: var(--color-gold);
  opacity: 0.1;
  line-height: 1;
  pointer-events: none;
  z-index: 0;
  user-select: none;
}

/* 内容卡片（切角面板） */
.page-about .chapter__content {
  flex: 1 1 300px;
  max-width: 600px;
  z-index: 1;
}
.page-about .chapter__content.card {
  background: #fff;
  padding: 2rem 2.5rem;
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 1.5rem), calc(100% - 1.5rem) 100%, 0 100%);
  box-shadow: 0 4px 16px rgba(0, 0, 0, 0.06);
}

/* 图片 */
.page-about .chapter__image {
  flex: 1 1 280px;
  max-width: 600px;
  z-index: 1;
}
.page-about .chapter__image img {
  display: block;
  width: 100%;
  height: auto;
  clip-path: polygon(0 0, 100% 0, 100% 88%, 92% 100%, 0 100%);
  object-fit: cover;
  transition: transform 0.3s ease;
}
.page-about .chapter__image img:hover {
  transform: scale(1.02);
}

/* 章节标题 */
.page-about .chapter__heading {
  font-family: var(--font-heading);
  font-weight: 800;
  font-size: 2rem;
  color: var(--color-dark);
  margin-bottom: 1rem;
  position: relative;
  padding-left: 0.5rem;
  border-left: 5px solid var(--color-green);
}

/* 核心价值章节：图片在左侧（利用 order） */
.page-about .chapter--values .chapter__image {
  order: -1;
}
.page-about .chapter--values .chapter__content {
  order: 0;
}

/* 斜线分割 */
.page-about .chapter-divider {
  height: 4px;
  background: var(--color-purple);
  transform: skewX(-12deg);
  width: 110%;
  margin: 0 -5%;
  position: relative;
  opacity: 0.6;
}

/* 可展开详情卡片 */
.page-about .details-card {
  margin-top: 1.5rem;
  border-top: 2px solid var(--color-border);
  padding-top: 0.75rem;
}
.page-about .details-card summary {
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: 1rem;
  color: var(--color-purple);
  cursor: pointer;
  outline: none;
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
}
.page-about .details-card summary::-webkit-details-marker {
  display: none;
}
.page-about .details-card summary::before {
  content: '▶';
  font-size: 0.75rem;
  color: var(--color-gold);
  transition: transform 0.2s;
}
.page-about .details-card[open] summary::before {
  transform: rotate(90deg);
}
.page-about .details-card-body {
  padding: 1rem 0 0.5rem;
  font-family: var(--font-body);
  font-size: 1rem;
  line-height: 1.7;
  color: var(--color-dark);
}

/* 第三章：背景装饰图片 */
.page-about .chapter--promise {
  min-height: 380px;
  display: flex;
  align-items: center;
}
.page-about .chapter--promise .chapter__bg-img {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  z-index: 0;
  opacity: 0.2;
  pointer-events: none;
}
.page-about .chapter--promise .chapter__content {
  background: rgba(255, 255, 255, 0.92);
  backdrop-filter: blur(2px);
}
.page-about .chapter--promise .chapter__number {
  color: var(--color-gold);
  opacity: 0.08;
}

/* 移动端适配 */
@media (max-width: 768px) {
  .page-about .page-title {
    font-size: 2rem;
    margin-bottom: 2rem;
  }
  .page-about .chapter {
    padding: 2.5rem 0;
  }
  .page-about .chapter__number {
    position: static;
    font-size: 3.5rem;
    opacity: 0.15;
    display: block;
    margin-bottom: 0.5rem;
    padding-left: 0;
  }
  .page-about .chapter-inner {
    flex-direction: column;
    gap: 1.5rem;
  }
  .page-about .chapter__content.card {
    padding: 1.5rem;
  }
  .page-about .chapter__image {
    max-width: 100%;
  }
  .page-about .chapter--values .chapter__image {
    order: 0;
  }
  .page-about .chapter-divider {
    transform: skewX(-6deg);
    height: 3px;
  }
  .page-about .chapter--promise {
    min-height: 300px;
  }
  .page-about .chapter--promise .chapter__bg-img {
    opacity: 0.15;
  }
  .page-about .details-card summary {
    font-size: 0.95rem;
  }
}