/* ===== 品牌档案页专属样式 .page-about ===== */
.page-about {
  --about-gap: 2rem;
  --about-side-w: 180px;
  --about-content-max: 720px;
  --about-hero-min-h: 420px;
  font-family: var(--font-body, 'Inter', sans-serif);
  color: var(--color-text, #0B1D3A);
  background: var(--color-bg, #F5F7FA);
  line-height: 1.6;
}

.page-about__inner {
  max-width: var(--max-width, 1280px);
  margin: 0 auto;
  padding: 1.5rem 1rem 3rem;
}

/* 面包屑 */
.page-about__breadcrumb {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.825rem;
  color: var(--color-text-secondary, #4A5568);
  margin-bottom: 2rem;
  padding-bottom: 0.75rem;
  border-bottom: 1px solid rgba(10, 29, 58, 0.08);
}
.page-about__breadcrumb-link {
  color: var(--color-primary, #0B1D3A);
  text-decoration: none;
  transition: color var(--transition, 0.25s ease);
}
.page-about__breadcrumb-link:hover {
  color: var(--color-accent, #FF6B35);
}
.page-about__breadcrumb-sep {
  color: var(--color-gray-medium, #A0AEC0);
  user-select: none;
}
.page-about__breadcrumb-current {
  font-weight: 500;
  color: var(--color-text-secondary, #4A5568);
}

/* 首屏 */
.page-about__hero {
  display: flex;
  flex-direction: column;
  gap: 2rem;
  margin-bottom: 3.5rem;
  min-height: var(--about-hero-min-h);
}
.page-about__hero-text {
  flex: 1 1 55%;
  display: flex;
  flex-direction: column;
  justify-content: center;
}
.page-about__hero-title {
  font-family: var(--font-heading, 'Playfair Display', Georgia, serif);
  font-size: 2.4rem;
  font-weight: 900;
  line-height: 1.15;
  margin: 0 0 0.5rem;
  color: var(--color-primary, #0B1D3A);
  display: flex;
  flex-direction: column;
}
.page-about__hero-slogan {
  display: block;
  font-size: 1.1rem;
  font-weight: 400;
  color: var(--color-accent, #FF6B35);
  margin-top: 0.25rem;
  letter-spacing: 0.04em;
}
.page-about__hero-desc {
  font-size: 1.05rem;
  color: var(--color-text-secondary, #4A5568);
  max-width: 36em;
  margin: 0.75rem 0 1.25rem;
  line-height: 1.65;
}
.page-about__hero-svg {
  align-self: flex-start;
  margin-top: 0.5rem;
}
.page-about__radar {
  display: block;
  width: 180px;
  height: 180px;
}
.page-about__hero-figure {
  flex: 1 1 45%;
  margin: 0;
  display: flex;
  align-items: center;
  justify-content: center;
}
.page-about__hero-img {
  width: 100%;
  max-width: 400px;
  height: auto;
  aspect-ratio: 1 / 1;
  object-fit: cover;
  border-radius: 12px;
  box-shadow: 0 8px 32px rgba(10, 29, 58, 0.08);
  background: var(--color-gray-light, #F5F7FA);
}

/* 主区域：侧边索引 + 内容 */
.page-about__main {
  display: flex;
  flex-direction: column;
  gap: 2rem;
  margin-bottom: 2.5rem;
}

/* 侧边索引 */
.page-about__side-index {
  flex-shrink: 0;
  width: 100%;
  background: var(--color-card, #FFFFFF);
  border-radius: 10px;
  padding: 0.75rem 1rem;
  box-shadow: 0 2px 12px rgba(10, 29, 58, 0.04);
  border: 1px solid rgba(10, 29, 58, 0.05);
}
.page-about__side-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 0.25rem 1rem;
}
.page-about__side-item {
  margin: 0;
}
.page-about__side-link {
  display: flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.4rem 0.25rem;
  text-decoration: none;
  color: var(--color-text-secondary, #4A5568);
  font-weight: 500;
  font-size: 0.9rem;
  border-bottom: 2px solid transparent;
  transition: color var(--transition, 0.25s ease), border-color var(--transition, 0.25s ease);
}
.page-about__side-link:hover {
  color: var(--color-primary, #0B1D3A);
  border-bottom-color: var(--color-accent, #FF6B35);
}
.page-about__side-num {
  font-family: var(--font-heading, 'Playfair Display', Georgia, serif);
  font-size: 0.95rem;
  font-weight: 700;
  color: var(--color-accent, #FF6B35);
  min-width: 1.6em;
}
.page-about__side-label {
  white-space: nowrap;
}

/* 内容区 */
.page-about__content {
  flex: 1;
  min-width: 0;
}

/* 章节 */
.page-about__section {
  margin-bottom: 3rem;
  scroll-margin-top: 5rem;
}
.page-about__section:last-of-type {
  margin-bottom: 0;
}
.page-about__section-header {
  display: flex;
  align-items: baseline;
  gap: 0.75rem;
  margin-bottom: 1.25rem;
  border-bottom: 1px solid rgba(10, 29, 58, 0.06);
  padding-bottom: 0.75rem;
}
.page-about__section-num.section-number {
  font-family: var(--font-heading, 'Playfair Display', Georgia, serif);
  font-size: 2.2rem;
  font-weight: 900;
  line-height: 1;
  color: var(--color-accent, #FF6B35);
  letter-spacing: -0.02em;
  flex-shrink: 0;
}
.page-about__section-title {
  font-family: var(--font-heading, 'Playfair Display', Georgia, serif);
  font-size: 1.5rem;
  font-weight: 700;
  margin: 0;
  color: var(--color-primary, #0B1D3A);
  line-height: 1.2;
}
.page-about__section-body {
  padding-left: 0.25rem;
}

/* 文字 */
.page-about__text {
  font-size: 0.975rem;
  color: var(--color-text-secondary, #4A5568);
  margin: 0 0 0.85rem;
  max-width: 56em;
  line-height: 1.7;
}
.page-about__text-lead {
  font-size: 1.2rem;
  font-weight: 500;
  color: var(--color-primary, #0B1D3A);
  margin: 0 0 0.75rem;
  line-height: 1.45;
}
.page-about__link {
  color: var(--color-accent, #FF6B35);
  text-decoration: none;
  font-weight: 500;
  transition: color var(--transition, 0.25s ease), border-color var(--transition, 0.25s ease);
  border-bottom: 1px solid transparent;
}
.page-about__link:hover {
  color: var(--color-primary, #0B1D3A);
  border-bottom-color: var(--color-accent, #FF6B35);
}

/* 功能网格 */
.page-about__features-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1rem;
  margin: 1.25rem 0 1.5rem;
}
.page-about__feature-card {
  position: relative;
  background: var(--color-card, #FFFFFF);
  border: 1px solid rgba(10, 29, 58, 0.06);
  border-radius: 10px;
  padding: 1.25rem 1.25rem 1rem;
  box-shadow: 0 2px 8px rgba(10, 29, 58, 0.03);
  transition: box-shadow var(--transition, 0.25s ease), transform var(--transition, 0.25s ease);
  cursor: default;
}
.page-about__feature-card:hover {
  box-shadow: 0 6px 24px rgba(10, 29, 58, 0.07);
  transform: translateY(-3px);
}
.page-about__feature-icon {
  width: 40px;
  height: 40px;
  margin-bottom: 0.6rem;
}
.page-about__feature-icon svg {
  display: block;
}
.page-about__feature-title {
  font-size: 1.05rem;
  font-weight: 700;
  margin: 0 0 0.3rem;
  color: var(--color-primary, #0B1D3A);
}
.page-about__feature-desc {
  font-size: 0.875rem;
  color: var(--color-text-secondary, #4A5568);
  margin: 0 0 0.4rem;
  line-height: 1.55;
}
.page-about__feature-tip {
  font-size: 0.8rem;
  color: var(--color-accent, #FF6B35);
  font-weight: 500;
  max-height: 0;
  overflow: hidden;
  opacity: 0;
  transition: max-height 0.35s ease, opacity 0.35s ease, margin 0.35s ease;
  margin-top: 0;
  line-height: 1.4;
  border-top: 1px solid transparent;
  padding-top: 0;
}
.page-about__feature-card:hover .page-about__feature-tip {
  max-height: 4em;
  opacity: 1;
  margin-top: 0.5rem;
  border-top-color: rgba(255, 107, 53, 0.15);
  padding-top: 0.5rem;
}

/* 图片容器 */
.page-about__figure {
  margin: 1.5rem 0 0;
  border-radius: 10px;
  overflow: hidden;
  background: var(--color-gray-light, #F5F7FA);
}
.page-about__fig-img {
  width: 100%;
  height: auto;
  max-width: 100%;
  object-fit: cover;
  display: block;
  border-radius: 10px;
}
.page-about__figure--features .page-about__fig-img {
  aspect-ratio: 500 / 300;
}
.page-about__figure--data .page-about__fig-img {
  aspect-ratio: 400 / 300;
}

/* 数据来源布局 */
.page-about__data-layout {
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
}
.page-about__data-text {
  flex: 1 1 55%;
}

/* 信任声明 */
.page-about__trust {
  margin-top: 3rem;
  padding: 1.25rem 1.5rem;
  background: var(--color-primary, #0B1D3A);
  border-radius: 10px;
  text-align: center;
}
.page-about__trust-text {
  font-size: 0.9rem;
  color: var(--color-white, #FFFFFF);
  margin: 0;
  line-height: 1.6;
  opacity: 0.92;
  max-width: 42em;
  margin-left: auto;
  margin-right: auto;
}

/* ===== 响应式 ===== */
@media (min-width: 640px) {
  .page-about__inner {
    padding: 1.75rem 1.5rem 3.5rem;
  }
  .page-about__hero-title {
    font-size: 2.8rem;
  }
  .page-about__hero-slogan {
    font-size: 1.2rem;
  }
  .page-about__hero {
    flex-direction: row;
    align-items: center;
  }
  .page-about__hero-figure {
    justify-content: flex-end;
  }
  .page-about__features-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .page-about__side-index {
    padding: 0.5rem 1.5rem;
  }
  .page-about__side-list {
    flex-wrap: nowrap;
    gap: 0 2rem;
  }
  .page-about__section-title {
    font-size: 1.65rem;
  }
}

@media (min-width: 900px) {
  .page-about__inner {
    padding: 2rem 2.5rem 4rem;
  }
  .page-about__main {
    flex-direction: row;
    gap: 2.5rem;
  }
  .page-about__side-index {
    width: var(--about-side-w);
    align-self: flex-start;
    position: sticky;
    top: calc(var(--header-height, 70px) + 1rem);
    padding: 1.25rem 0.75rem;
    border-radius: 10px;
  }
  .page-about__side-list {
    flex-direction: column;
    gap: 0.25rem;
  }
  .page-about__side-link {
    border-bottom: none;
    border-left: 3px solid transparent;
    padding: 0.5rem 0.75rem;
    border-radius: 4px;
  }
  .page-about__side-link:hover {
    border-left-color: var(--color-accent, #FF6B35);
    background: rgba(255, 107, 53, 0.04);
  }
  .page-about__content {
    max-width: var(--about-content-max);
  }
  .page-about__hero-title {
    font-size: 3.2rem;
  }
  .page-about__hero-slogan {
    font-size: 1.3rem;
  }
  .page-about__features-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .page-about__section-title {
    font-size: 1.8rem;
  }
  .page-about__data-layout {
    flex-direction: row;
    align-items: flex-start;
  }
  .page-about__section-num.section-number {
    font-size: 2.6rem;
  }
  .page-about__radar {
    width: 200px;
    height: 200px;
  }
}

@media (min-width: 1100px) {
  .page-about__features-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .page-about__hero-title {
    font-size: 3.5rem;
  }
  .page-about__hero-desc {
    font-size: 1.1rem;
  }
  .page-about__side-index {
    width: 200px;
  }
}