.page-about {
  --page-about-hero-bg: var(--primary);
  --page-about-hero-accent: var(--secondary);
  --page-about-card-shadow: var(--shadow);
  --page-about-feature-radius: 8px;
  --page-about-max-width: min(100% - 2rem, 1280px);
  margin-inline: auto;
  max-width: var(--page-about-max-width);
  padding-block: 1.5rem 3rem;
  background: var(--bg);
}

/* 面包屑 */
.page-about__breadcrumb {
  margin-block-end: 1.5rem;
  font: var(--font-small);
  color: var(--text-secondary);
}
.page-about__breadcrumb-list {
  list-style: none;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}
.page-about__breadcrumb-item + .page-about__breadcrumb-item::before {
  content: "›";
  margin-inline-end: 0.5rem;
  color: var(--border);
}
.page-about__breadcrumb-link {
  color: var(--accent);
  text-decoration: none;
  transition: color var(--transition);
}
.page-about__breadcrumb-link:hover {
  color: var(--primary);
  text-decoration: underline;
}

/* 首屏 */
.page-about__hero {
  position: relative;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  background: var(--page-about-hero-bg);
  color: var(--surface);
  padding: 2.5rem 1.5rem;
  border-radius: var(--page-about-feature-radius);
  margin-block-end: 2.5rem;
  overflow: hidden;
  min-height: 300px;
}
.page-about__hero-bg {
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, var(--page-about-hero-bg) 60%, transparent 80%),
              linear-gradient(45deg, var(--page-about-hero-accent) 0%, transparent 20%);
  clip-path: polygon(0 0, 100% 0, 100% 80%, 0 100%);
  z-index: 0;
  pointer-events: none;
}
.page-about__hero-content {
  position: relative;
  z-index: 1;
  max-width: 560px;
  flex: 1 1 60%;
}
.page-about__hero-kicker {
  display: inline-block;
  font: var(--font-small);
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--page-about-hero-accent);
  margin-block-end: 0.5rem;
  border-bottom: 2px solid var(--page-about-hero-accent);
  padding-block-end: 0.25rem;
}
.page-about__hero-title {
  font: var(--font-heading);
  margin: 0 0 0.75rem;
  line-height: 1.05;
}
.page-about__hero-desc {
  font: var(--font-body);
  color: rgba(255,255,255,0.85);
  max-width: 36ch;
}
.page-about__hero-image-wrapper {
  position: relative;
  z-index: 1;
  flex: 0 0 auto;
  width: 180px;
  height: 135px;
  border-radius: 4px;
  overflow: hidden;
  box-shadow: 0 8px 24px var(--page-about-card-shadow);
  align-self: flex-end;
  transform: skewX(-3deg);
}
.page-about__hero-image {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
}

/* 使命陈述 */
.page-about__mission {
  padding: 2rem 0;
  border-bottom: 2px solid var(--border);
  margin-block-end: 2rem;
}
.page-about__mission-container {
  display: flex;
  flex-wrap: wrap;
  gap: 1.5rem;
  align-items: flex-start;
}
.page-about__mission-title {
  font: var(--font-heading);
  font-size: clamp(1.75rem, 3.5vw, 2.75rem);
  color: var(--text-primary);
  margin: 0;
  flex: 0 0 100%;
}
.page-about__mission-text {
  font: var(--font-body);
  color: var(--text-secondary);
  max-width: 65ch;
  flex: 1 1 75%;
}
.page-about__mission-icon {
  width: 120px;
  height: 90px;
  object-fit: contain;
  opacity: 0.7;
  flex: 0 0 auto;
}

/* 服务特色 */
.page-about__features {
  padding: 0 0 2.5rem;
  margin-block-end: 2rem;
}
.page-about__features-title {
  font: var(--font-heading);
  font-size: clamp(1.75rem, 3.5vw, 2.75rem);
  color: var(--text-primary);
  margin: 0 0 1.5rem;
}
.page-about__features-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.5rem;
}
.page-about__feature-card {
  position: relative;
  background: var(--surface);
  border-radius: var(--page-about-feature-radius);
  padding: 1.5rem 1.25rem;
  box-shadow: 0 4px 12px var(--page-about-card-shadow);
  border-left: 4px solid var(--accent);
  transition: transform var(--transition), box-shadow var(--transition);
  cursor: default;
}
.page-about__feature-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 12px 28px var(--page-about-card-shadow);
}
.page-about__feature-icon {
  width: 60px;
  height: 60px;
  margin-block-end: 0.75rem;
  background: var(--bg);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
}
.page-about__feature-img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: contain;
}
.page-about__feature-heading {
  font: var(--font-heading);
  font-size: 1.25rem;
  margin: 0 0 0.5rem;
  color: var(--primary);
}
.page-about__feature-summary {
  font: var(--font-body);
  color: var(--text-secondary);
  margin: 0 0 0.5rem;
}
.page-about__feature-tip {
  font: var(--font-small);
  color: var(--accent);
  max-height: 0;
  opacity: 0;
  overflow: hidden;
  transition: max-height 0.35s ease, opacity 0.35s ease, margin 0.35s ease;
  margin: 0;
}
.page-about__feature-card:hover .page-about__feature-tip {
  max-height: 120px;
  opacity: 1;
  margin-block-start: 0.5rem;
}

/* 联系引导 */
.page-about__contact-cta {
  padding: 2.5rem 1.5rem;
  background: var(--surface);
  border-radius: var(--page-about-feature-radius);
  border: 1px solid var(--border);
}
.page-about__cta-container {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}
.page-about__cta-title {
  font: var(--font-heading);
  font-size: clamp(1.5rem, 3vw, 2rem);
  color: var(--text-primary);
  margin: 0;
  flex: 1 1 100%;
}
.page-about__cta-text {
  font: var(--font-body);
  color: var(--text-secondary);
  max-width: 40ch;
  flex: 1 1 60%;
}
.page-about__cta-links {
  display: flex;
  gap: 0.75rem;
  flex-wrap: wrap;
}
.page-about__cta-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.6rem 1.25rem;
  border-radius: 6px;
  font: var(--font-body);
  font-weight: 600;
  text-decoration: none;
  background: var(--accent);
  color: var(--surface);
  transition: background var(--transition), transform var(--transition);
  border: none;
  cursor: pointer;
}
.page-about__cta-btn:hover {
  background: #e0552a;
  transform: scale(1.02);
}
.page-about__cta-btn--alt {
  background: transparent;
  color: var(--accent);
  border: 2px solid var(--accent);
}
.page-about__cta-btn--alt:hover {
  background: var(--accent);
  color: var(--surface);
}

/* 响应式 */
@media (min-width: 768px) {
  .page-about__hero {
    padding: 3rem 2.5rem;
    min-height: 360px;
  }
  .page-about__hero-image-wrapper {
    width: 240px;
    height: 180px;
  }
  .page-about__mission-container {
    flex-direction: row;
    flex-wrap: nowrap;
  }
  .page-about__mission-title {
    flex: 0 0 auto;
  }
  .page-about__features-grid {
    grid-template-columns: repeat(3, 1fr);
  }
  .page-about__feature-card {
    padding: 1.75rem 1.5rem;
  }
  .page-about__cta-title {
    flex: 0 0 auto;
  }
  .page-about__cta-text {
    flex: 1 1 auto;
  }
}

/* 确保图片响应式 */
.page-about img {
  max-width: 100%;
  height: auto;
}
.page-about .page-about__hero-image,
.page-about .page-about__mission-icon,
.page-about .page-about__feature-img {
  max-width: 100%;
  height: auto;
}