.page-about {
  --about-rule: 1px solid var(--gray-300);
  --about-rule-dash: 1px dashed var(--gray-300);
  background: var(--white);
  color: var(--ink-900);
}

/* —— 面包屑 —— */
.page-about .breadcrumb {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 1.25rem var(--gutter) 0;
  font-size: 14px;
  color: var(--text-mute);
}
.page-about .breadcrumb__list {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: .5rem;
  margin: 0;
  padding: 0;
}
.page-about .breadcrumb__list > li + li::before {
  content: "/";
  margin-right: .5rem;
  color: var(--gray-300);
}
.page-about .breadcrumb a {
  color: var(--blue-600);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: border-color var(--ease), color var(--ease);
}
.page-about .breadcrumb a:hover,
.page-about .breadcrumb a:focus-visible {
  border-bottom-color: var(--orange-500);
  color: var(--orange-500);
}

/* —— 首屏框景 —— */
.page-about .about-head {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: clamp(1.25rem, 3vw, 2.25rem) var(--gutter) clamp(1.5rem, 4vw, 3rem);
}
.page-about .about-head__frame {
  position: relative;
  border: 1px solid var(--ink-900);
  padding: clamp(1.5rem, 4vw, 3rem) clamp(1.25rem, 4vw, 3.25rem) calc(clamp(1.5rem, 4vw, 3rem) + 10px);
  background: var(--white);
}
.page-about .about-head__frame::before {
  content: "";
  position: absolute;
  inset: 18px 18px auto auto;
  width: 8px;
  height: 8px;
  border: 1px solid var(--ink-900);
  background: var(--orange-500);
}
.page-about .about-head__frame::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 10px;
  pointer-events: none;
  background-image: repeating-linear-gradient(
    to right,
    var(--gray-300) 0 1px,
    transparent 1px 24px
  );
  background-size: 100% 100%;
}
.page-about .about-head__bar {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  align-items: baseline;
  gap: .5rem;
  padding-bottom: 1rem;
  margin-bottom: 1.5rem;
  border-bottom: var(--about-rule);
  font-size: 13px;
  color: var(--text-mute);
  letter-spacing: .04em;
  font-weight: 600;
}
.page-about .about-head__stamp {
  font-weight: 500;
}
.page-about .about-head h1 {
  font-family: var(--font-head);
  font-weight: 900;
  font-size: clamp(1.9rem, 5.5vw, 3.1rem);
  line-height: 1.15;
  letter-spacing: -.01em;
  margin: 0 0 1.5rem;
  color: var(--ink-900);
  max-width: 22ch;
}
.page-about .about-head__br {
  display: none;
}
@media (min-width: 720px) {
  .page-about .about-head__br { display: inline; }
}
.page-about .about-head__lede {
  font-size: clamp(1.02rem, 1.3vw, 1.15rem);
  line-height: 1.75;
  color: var(--text-soft);
  max-width: 42ch;
  margin: 0 0 2rem;
}
.page-about .about-head__stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1.25rem 1rem;
  margin: 0;
  padding: 1.5rem 0 0;
  border-top: var(--about-rule);
}
.page-about .about-head__stats > div {
  display: flex;
  flex-direction: column;
  gap: .35rem;
  min-width: 0;
}
.page-about .about-head__stats dt {
  font-size: 13px;
  color: var(--text-mute);
  letter-spacing: .04em;
  margin: 0;
}
.page-about .about-head__stats dd {
  margin: 0;
  font-size: clamp(1.5rem, 3.4vw, 2rem);
  font-weight: 800;
  color: var(--ink-900);
  line-height: 1;
}
.page-about .about-head__stats dd span {
  font-size: .52em;
  font-weight: 600;
  color: var(--text-mute);
  margin-left: .3em;
}
.page-about .about-head__foot {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: .5rem 1.25rem;
  margin: 1rem 0 0;
  font-size: 13px;
  color: var(--text-mute);
  letter-spacing: .03em;
}
@media (min-width: 720px) {
  .page-about .about-head__stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

/* —— 视觉图 —— */
.page-about .about-visual {
  margin: 0;
}
.page-about .about-visual img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
  border: 1px solid var(--gray-300);
  background: var(--ink-800);
}
.page-about .about-visual .media-caption,
.page-about .media-caption {
  margin-top: .75rem;
  font-family: var(--font-mono);
  font-size: 13px;
  line-height: 1.6;
  color: var(--text-mute);
  letter-spacing: .02em;
  max-width: 72ch;
}
.page-about .about-visual--lead {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 0 var(--gutter) clamp(2rem, 4vw, 3.25rem);
}
.page-about .about-visual--inner {
  margin: 2rem 0 0;
}
.page-about .about-visual--square img {
  aspect-ratio: 1 / 1;
}
@media (min-width: 720px) {
  .page-about .about-visual--inner {
    max-width: 760px;
  }
  .page-about .about-visual--square {
    max-width: 480px;
  }
}

/* —— 章节堆叠 —— */
.page-about .about-block {
  padding: clamp(2.75rem, 6vw, 5rem) var(--gutter);
  border-top: var(--about-rule);
}
.page-about .about-block--panel {
  background: var(--gray-050);
  border-top-color: transparent;
}
.page-about .about-block__inner {
  max-width: var(--maxw);
  margin: 0 auto;
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.25rem;
}
@media (min-width: 720px) {
  .page-about .about-block__inner {
    grid-template-columns: 104px minmax(0, 1fr);
    gap: clamp(1.5rem, 3vw, 2.75rem);
  }
}
@media (min-width: 1024px) {
  .page-about .about-block__inner {
    grid-template-columns: 140px minmax(0, 1fr);
    gap: 3rem;
  }
}
.page-about .about-block__rail {
  display: flex;
  align-items: baseline;
  gap: .75rem;
}
.page-about .about-block__num {
  font-size: clamp(1.75rem, 3.6vw, 2.5rem);
  font-weight: 800;
  color: var(--blue-600);
  line-height: 1;
  letter-spacing: -.02em;
}
@media (min-width: 720px) {
  .page-about .about-block__rail {
    flex-direction: column;
    align-items: flex-start;
    gap: .5rem;
    position: sticky;
    top: 120px;
  }
}
.page-about .about-block__body {
  min-width: 0;
}
.page-about .about-block h2 {
  font-family: var(--font-head);
  font-weight: 800;
  font-size: clamp(1.5rem, 3.2vw, 2rem);
  line-height: 1.25;
  letter-spacing: -.01em;
  margin: 0 0 1.25rem;
  color: var(--ink-900);
  max-width: 26ch;
}
.page-about .eyebrow {
  font-size: 13px;
  font-weight: 600;
  letter-spacing: .1em;
  color: var(--text-mute);
  text-transform: none;
}

/* —— 正文 —— */
.page-about .prose {
  max-width: var(--measure);
}
.page-about .prose p {
  font-size: var(--fs-base);
  line-height: 1.75;
  color: var(--text-soft);
  margin: 0 0 1.15em;
}
.page-about .prose p:last-child {
  margin-bottom: 0;
}
.page-about .prose a {
  color: var(--blue-600);
  text-decoration: none;
  border-bottom: 1px solid var(--blue-400);
  transition: color var(--ease), border-color var(--ease);
}
.page-about .prose a:hover,
.page-about .prose a:focus-visible {
  color: var(--orange-500);
  border-bottom-color: var(--orange-500);
}

/* —— 团队卡片（玻璃层） —— */
.page-about .about-team-cards {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1rem;
  margin: 2rem 0 0;
}
@media (min-width: 640px) {
  .page-about .about-team-cards {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}
.page-about .about-team-card {
  position: relative;
  background: rgba(255, 255, 255, .72);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  border: 1px solid var(--gray-300);
  border-left: 3px solid var(--blue-600);
  padding: 1.25rem 1.25rem 1.35rem 1.5rem;
  transition: border-color var(--ease), border-left-color var(--ease), background var(--ease);
}
.page-about .about-team-card:hover {
  border-color: var(--blue-400);
  border-left-color: var(--orange-500);
  background: rgba(255, 255, 255, .92);
}
.page-about .about-team-card > .num {
  display: block;
  font-size: 1.5rem;
  font-weight: 800;
  color: var(--blue-600);
  line-height: 1;
  margin-bottom: .65rem;
}
.page-about .about-team-card h3 {
  font-size: 1.05rem;
  font-weight: 700;
  margin: 0 0 .5rem;
  color: var(--ink-900);
  line-height: 1.35;
}
.page-about .about-team-card p {
  font-size: 14.5px;
  line-height: 1.7;
  color: var(--text-soft);
  margin: 0;
}

/* —— 时间线 —— */
.page-about .about-timeline {
  list-style: none;
  padding: 0;
  margin: 2.25rem 0 0;
  border-top: var(--about-rule);
  max-width: 780px;
}
.page-about .about-timeline__item {
  display: grid;
  grid-template-columns: 80px minmax(0, 1fr);
  gap: 1rem;
  padding: 1.5rem 0;
  border-bottom: var(--about-rule-dash);
  transition: background var(--ease);
}
.page-about .about-timeline__item:hover {
  background: var(--orange-100);
}
@media (min-width: 720px) {
  .page-about .about-timeline__item {
    grid-template-columns: 128px minmax(0, 1fr);
    gap: 2rem;
    padding: 1.75rem 0;
  }
}
.page-about .about-timeline__year {
  font-size: 1.35rem;
  font-weight: 800;
  color: var(--blue-600);
  text-decoration: none;
  display: inline-block;
  height: fit-content;
  padding-bottom: .15rem;
  border-bottom: 2px solid transparent;
  transition: color var(--ease), border-color var(--ease);
}
.page-about .about-timeline__year:hover,
.page-about .about-timeline__year:focus-visible {
  color: var(--orange-500);
  border-bottom-color: var(--orange-500);
}
.page-about .about-timeline__text h3 {
  font-size: 1.1rem;
  font-weight: 700;
  line-height: 1.4;
  margin: 0 0 .6rem;
  color: var(--ink-900);
}
.page-about .about-timeline__text p {
  font-size: 15.5px;
  line-height: 1.75;
  color: var(--text-soft);
  margin: 0 0 .75rem;
  max-width: 62ch;
}
.page-about .about-timeline__tip {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--text-mute);
  margin: 0;
  padding: .3rem .6rem;
  background: var(--gray-050);
  border-left: 2px solid var(--blue-400);
  opacity: .7;
  transition: opacity var(--ease), border-left-color var(--ease), color var(--ease);
}
.page-about .about-timeline__item:hover .about-timeline__tip {
  opacity: 1;
  border-left-color: var(--orange-500);
  color: var(--ink-800);
}

/* —— 结尾邀请 —— */
.page-about .about-block--closing {
  background: var(--blue-600);
  border-top-color: transparent;
}
.page-about .about-block--closing .about-block__num {
  color: var(--orange-500);
}
.page-about .about-block--closing .eyebrow {
  color: rgba(255, 255, 255, .6);
}
.page-about .about-block--closing h2 {
  color: var(--white);
}
.page-about .about-block--closing .prose p {
  color: rgba(255, 255, 255, .82);
}
.page-about .about-cta {
  display: flex;
  flex-wrap: wrap;
  gap: .75rem;
  margin: 2rem 0 0;
}
.page-about .about-cta .btn--accent {
  background: var(--orange-500);
  color: var(--white);
  border: 1px solid var(--orange-500);
}
.page-about .about-cta .btn--accent:hover {
  background: #E95B10;
  border-color: #E95B10;
}
.page-about .about-cta .btn--ghost {
  background: transparent;
  color: var(--white);
  border: 1px solid rgba(255, 255, 255, .5);
}
.page-about .about-cta .btn--ghost:hover {
  border-color: var(--white);
  background: rgba(255, 255, 255, .1);
}
.page-about .about-cta__foot {
  margin: 1.25rem 0 0;
  font-size: 13px;
  color: rgba(255, 255, 255, .6);
  letter-spacing: .02em;
}

/* —— 减少动效 —— */
@media (prefers-reduced-motion: reduce) {
  .page-about * {
    transition-duration: 0ms !important;
  }
}

/* —— 防止窄屏溢出 —— */
.page-about img,
.page-about .about-head__frame,
.page-about .about-timeline,
.page-about .about-team-card {
  max-width: 100%;
}