/* ===== page-about 专属样式 ===== */
.page-about {
  --about-hero-gap: 3rem;
  --about-chapter-gap: 4.5rem;
  --about-chapter-padding: 2.5rem 0;
  --about-value-gap: 1.75rem;
  display: block;
  width: 100%;
  max-width: 100%;
  overflow-x: hidden;
}

/* ---------- 面包屑 & 控制面板微调 ---------- */
.page-about .breadcrumb {
  padding: 1rem 0 0.25rem;
  font-family: var(--font-body);
  font-size: 0.85rem;
  color: var(--color-text);
  opacity: 0.75;
}
.page-about .breadcrumb a {
  color: var(--color-primary);
  text-decoration: none;
  transition: color var(--transition);
}
.page-about .breadcrumb a:hover {
  color: var(--color-nav-hover);
}
.page-about .breadcrumb span[aria-current="page"] {
  font-weight: 600;
  color: var(--color-dark);
}

.page-about .control-panel {
  margin: 0.25rem 0 1.5rem;
  padding: 0.5rem 1rem;
  background: var(--color-white);
  border-left: 3px solid var(--color-primary);
  font-family: var(--font-body);
  font-size: 0.8rem;
  color: var(--color-text);
  opacity: 0.85;
}

/* ---------- 首屏 ---------- */
.page-about__hero {
  padding: 2rem 0 3rem;
  border-bottom: 1px solid var(--color-border);
}
.page-about__hero-inner {
  display: flex;
  flex-direction: column;
  gap: var(--about-hero-gap);
}
.page-about__hero-text {
  flex: 1 1 50%;
}
.page-about__hero-text h1 {
  font-family: var(--font-heading);
  font-size: 2.4rem;
  line-height: 1.1;
  color: var(--color-dark);
  margin: 0 0 0.75rem;
  letter-spacing: -0.02em;
}
.page-about__hero-subtitle {
  font-family: var(--font-body);
  font-size: 1.15rem;
  font-weight: 600;
  color: var(--color-primary);
  margin: 0 0 1.25rem;
  line-height: 1.4;
}
.page-about__hero-desc {
  font-family: var(--font-body);
  font-size: 1rem;
  line-height: 1.7;
  color: var(--color-text);
  margin: 0;
  max-width: 48em;
}
.page-about__hero-visual {
  flex: 1 1 50%;
  display: flex;
  align-items: center;
  justify-content: center;
}
.page-about__hero-img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
  border-radius: 4px;
  box-shadow: 0 4px 20px rgba(0,0,0,0.08);
}

/* ---------- 章节通用 ---------- */
.page-about__chapter {
  padding: var(--about-chapter-padding);
  border-bottom: 1px solid var(--color-border);
  transition: background-color var(--transition);
  background-color: transparent;
}
.page-about__chapter:last-of-type {
  border-bottom: none;
}
.page-about__chapter:hover {
  background-color: #f7f5f3;
}
.page-about__chapter-header {
  display: flex;
  align-items: baseline;
  gap: 0.75rem;
  margin-bottom: 1.75rem;
}
.page-about__chapter-header .section-number {
  font-family: var(--font-heading);
  font-size: 2.8rem;
  line-height: 1;
  color: var(--color-gold);
  transition: transform 0.4s ease;
  display: inline-block;
}
.page-about__chapter:hover .section-number {
  transform: rotate(16deg);
}
.page-about__chapter-header h2 {
  font-family: var(--font-heading);
  font-size: 1.8rem;
  line-height: 1.2;
  color: var(--color-dark);
  margin: 0;
  letter-spacing: -0.01em;
}
.page-about__chapter-body {
  display: flex;
  flex-direction: column;
  gap: 2rem;
  align-items: flex-start;
}
.page-about__chapter-text,
.page-about__chapter-img {
  flex: 1 1 50%;
  width: 100%;
}
.page-about__chapter-text p {
  font-family: var(--font-body);
  font-size: 1rem;
  line-height: 1.75;
  color: var(--color-text);
  margin: 0 0 1.25rem;
}
.page-about__chapter-text p:last-child {
  margin-bottom: 0;
}
.page-about__chapter-text a {
  color: var(--color-primary);
  text-decoration: underline;
  text-underline-offset: 3px;
  transition: color var(--transition);
}
.page-about__chapter-text a:hover {
  color: var(--color-nav-hover);
}
.page-about__chapter-img img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
  border-radius: 4px;
  box-shadow: 0 4px 16px rgba(0,0,0,0.06);
}

/* ---------- 价值观列表 ---------- */
.page-about__values-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: var(--about-value-gap);
}
.page-about__values-item {
  padding-left: 1.25rem;
  border-left: 3px solid var(--color-primary);
}
.page-about__values-title {
  font-family: var(--font-heading);
  font-size: 1.1rem;
  color: var(--color-dark);
  display: block;
  margin-bottom: 0.35rem;
}
.page-about__values-desc {
  font-family: var(--font-body);
  font-size: 0.95rem;
  line-height: 1.65;
  color: var(--color-text);
  margin: 0;
}

/* ---------- 桌面端 (≥768px) ---------- */
@media (min-width: 768px) {
  .page-about {
    --about-hero-gap: 2rem;
    --about-chapter-gap: 5rem;
  }
  .page-about__hero {
    padding: 3rem 0 4rem;
  }
  .page-about__hero-inner {
    flex-direction: row;
    align-items: center;
  }
  .page-about__hero-text h1 {
    font-size: 3.2rem;
  }
  .page-about__hero-subtitle {
    font-size: 1.3rem;
  }
  .page-about__hero-desc {
    font-size: 1.05rem;
  }
  .page-about__hero-visual {
    justify-content: flex-end;
  }
  .page-about__hero-img {
    max-width: 90%;
  }

  .page-about__chapter {
    padding: 3.5rem 0;
  }
  .page-about__chapter-header {
    margin-bottom: 2.25rem;
  }
  .page-about__chapter-header .section-number {
    font-size: 3.6rem;
  }
  .page-about__chapter-header h2 {
    font-size: 2.2rem;
  }
  .page-about__chapter-body {
    flex-direction: row;
    gap: 3rem;
    align-items: center;
  }
  .page-about__chapter-body--reverse {
    flex-direction: row-reverse;
  }
  .page-about__chapter-text p {
    font-size: 1.05rem;
  }

  .page-about__values-list {
    gap: 2rem;
  }
  .page-about__values-title {
    font-size: 1.2rem;
  }
  .page-about__values-desc {
    font-size: 1rem;
  }
}

/* ---------- 宽屏 (≥1024px) 增强 ---------- */
@media (min-width: 1024px) {
  .page-about__hero {
    padding: 4rem 0 5rem;
  }
  .page-about__hero-text h1 {
    font-size: 3.8rem;
  }
  .page-about__chapter {
    padding: 4.5rem 0;
  }
  .page-about__chapter-header .section-number {
    font-size: 4.2rem;
  }
  .page-about__chapter-header h2 {
    font-size: 2.6rem;
  }
  .page-about__chapter-body {
    gap: 4rem;
  }
}

/* ---------- 极窄屏安全 ---------- */
@media (max-width: 420px) {
  .page-about__hero-text h1 {
    font-size: 1.8rem;
  }
  .page-about__chapter-header .section-number {
    font-size: 2.2rem;
  }
  .page-about__chapter-header h2 {
    font-size: 1.4rem;
  }
  .page-about__values-item {
    padding-left: 0.75rem;
  }
}