.page-about {
  --color-accent: #1D3557;
  --color-neutral-light: #F1FAEE;
  --color-primary: #FF6B35;
  --color-secondary: #E63946;
  --color-data-highlight: #FFD166;
  --color-border: #A8DADC;
  --color-neutral-dark: #0B1A2A;
  --flip-duration: 0.6s;
  --font-heading: 900 italic clamp(2rem,5vw,4rem)/1.1 'Inter','Roboto',sans-serif;
  --font-body: 400 1rem/1.6 'Inter','Roboto',sans-serif;
  --font-data: 700 2rem/1.2 'JetBrains Mono',monospace;
}

.page-about .page-about__container {
  display: flex;
  min-height: calc(100vh - var(--header-height, 72px));
}

/* 左侧固定叙事 */
.page-about .page-about__left {
  position: sticky;
  top: var(--header-height, 72px);
  align-self: flex-start;
  width: 40%;
  background: var(--color-accent);
  color: var(--color-neutral-light);
  padding: 2rem 1.5rem;
  display: flex;
  flex-direction: column;
  justify-content: center;
  gap: 1.5rem;
}

.page-about .page-about__left .breadcrumb {
  margin-bottom: 0.5rem;
}

.page-about .page-about__left .breadcrumb a {
  color: var(--color-data-highlight);
  text-decoration: none;
}

.page-about .page-about__left .breadcrumb .sep {
  margin: 0 0.3em;
}

.page-about .page-about__left .breadcrumb span[aria-current] {
  color: var(--color-neutral-light);
}

.page-about .page-about__title {
  font: var(--font-heading);
  margin: 0;
  color: var(--color-primary);
}

.page-about .page-about__subtitle {
  font: var(--font-body);
  font-weight: 700;
  margin: 0;
  color: var(--color-data-highlight);
}

.page-about .page-about__desc {
  font: var(--font-body);
  margin: 0;
  line-height: 1.6;
}

.page-about .page-about__vision {
  background: rgba(255,255,255,0.08);
  padding: 1rem;
  border-radius: var(--radius, 8px);
}

.page-about .page-about__vision .category-tag {
  background: var(--color-secondary);
  color: #fff;
  padding: 0.2em 0.6em;
  border-radius: 3px;
  font-size: 0.85rem;
  font-weight: 700;
  display: inline-block;
  margin-bottom: 0.5rem;
}

.page-about .page-about__vision p {
  margin: 0;
  font: var(--font-body);
}

.page-about .page-about__hero {
  margin-top: auto;
  text-align: center;
}

.page-about .page-about__hero-img {
  max-width: 100%;
  height: auto;
  object-fit: contain;
  border-radius: var(--radius-lg, 12px);
  box-shadow: var(--shadow-lg, 0 8px 40px rgba(0,0,0,0.25));
}

/* 右侧滚动区 */
.page-about .page-about__right {
  flex: 1;
  background: var(--color-neutral-light);
  padding: 2rem 1.5rem 3rem;
  overflow-y: auto;
  max-height: calc(100vh - var(--header-height, 72px));
}

.page-about .page-about__section {
  margin-bottom: 3rem;
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 0.5s ease, transform 0.5s ease;
}

.page-about .page-about__section.is-visible {
  opacity: 1;
  transform: translateY(0);
}

.page-about .page-about__section-title {
  font: var(--font-heading);
  font-size: clamp(1.5rem, 3vw, 2rem);
  color: var(--color-accent);
  margin: 0 0 1.5rem;
  padding-bottom: 0.5rem;
  border-bottom: 3px solid var(--color-secondary);
}

/* 服务卡片翻转 */
.page-about .page-about__cards {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
  gap: 1.5rem;
}

.page-about .service-card {
  perspective: 1000px;
  height: 280px;
}

.page-about .service-card .service-card__inner {
  position: relative;
  width: 100%;
  height: 100%;
  transition: transform var(--flip-duration) ease;
  transform-style: preserve-3d;
  cursor: default;
}

.page-about .service-card:hover .service-card__inner {
  transform: rotateY(180deg);
}

.page-about .service-card__front,
.page-about .service-card__back {
  position: absolute;
  top: 0; left: 0; right: 0; bottom: 0;
  backface-visibility: hidden;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 1rem;
  border-radius: var(--radius, 8px);
  background: var(--color-accent);
  color: var(--color-neutral-light);
  box-shadow: var(--shadow-md, 0 4px 20px rgba(13,27,42,0.12));
}

.page-about .service-card__back {
  transform: rotateY(180deg);
  background: var(--color-primary);
  color: #fff;
}

.page-about .service-card__front h3 {
  margin: 0.8rem 0 0;
  font: 700 1.2rem/1.3 'Inter', sans-serif;
}

.page-about .service-card__icon {
  max-width: 80%;
  height: auto;
  object-fit: contain;
  border-radius: 4px;
}

.page-about .service-card__back p {
  font: var(--font-body);
  text-align: center;
  margin: 0;
}

.page-about .page-about__more {
  margin-top: 1rem;
}

.page-about .page-about__more .btn {
  display: inline-block;
  padding: 0.6rem 1.5rem;
  border: 2px solid var(--color-primary);
  color: var(--color-primary);
  border-radius: var(--radius, 8px);
  text-decoration: none;
  font-weight: 700;
  transition: background 0.3s, color 0.3s;
}

.page-about .page-about__more .btn:hover {
  background: var(--color-primary);
  color: #fff;
}

/* 数据模块 */
.page-about .page-about__data-block {
  display: flex;
  gap: 2rem;
  align-items: flex-start;
  flex-wrap: wrap;
}

.page-about .page-about__data-text {
  flex: 2;
  min-width: 240px;
}

.page-about .page-about__data-text p {
  font: var(--font-body);
  margin: 0 0 1rem;
}

.page-about .page-about__data-list {
  list-style: none;
  padding: 0;
  margin: 0;
}

.page-about .page-about__data-list li {
  position: relative;
  padding-left: 1.2rem;
  margin-bottom: 0.5rem;
  font: var(--font-body);
}

.page-about .page-about__data-list li::before {
  content: "▸";
  position: absolute;
  left: 0;
  color: var(--color-secondary);
  font-weight: 700;
}

.page-about .page-about__data-vis {
  flex: 1;
  min-width: 180px;
}

.page-about .page-about__data-img {
  max-width: 100%;
  height: auto;
  object-fit: cover;
  border-radius: var(--radius, 8px);
  box-shadow: var(--shadow-sm, 0 2px 8px rgba(0,0,0,0.1));
}

/* 联系我们 */
.page-about .page-about__contact {
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.page-about .page-about__contact-item {
  display: flex;
  align-items: center;
  gap: 0.8rem;
}

.page-about .page-about__contact-item .category-tag {
  background: var(--color-secondary);
  color: #fff;
  padding: 0.2em 0.6em;
  border-radius: 3px;
  font-size: 0.85rem;
  font-weight: 700;
  flex-shrink: 0;
}

.page-about .page-about__contact-item a,
.page-about .page-about__contact-item span {
  font: var(--font-body);
  color: var(--color-neutral-dark);
  text-decoration: none;
}

.page-about .page-about__contact-item a:hover {
  text-decoration: underline;
}

.page-about .page-about__contact-note {
  font: var(--font-body);
  margin: 0.5rem 0 0;
  color: var(--color-accent);
}

.page-about .page-about__contact-note a {
  color: var(--color-primary);
  text-decoration: underline;
}

/* 移动端适配 */
@media (max-width: 768px) {
  .page-about .page-about__container {
    flex-direction: column;
  }

  .page-about .page-about__left {
    position: static;
    width: 100%;
    padding: 1.5rem 1rem;
    min-height: auto;
  }

  .page-about .page-about__left .page-about__hero {
    display: none; /* 移动端隐藏主图节省空间 */
  }

  .page-about .page-about__right {
    max-height: none;
    padding: 1.5rem 1rem;
  }

  .page-about .page-about__cards {
    grid-template-columns: 1fr;
  }

  .page-about .service-card {
    height: 240px;
  }

  .page-about .page-about__data-block {
    flex-direction: column;
  }
}