.page-about {
  --about-line: #24415F;
  background: var(--ink);
  color: var(--fog);
  overflow-x: clip;
  padding-bottom: clamp(2rem, 5vw, 3.5rem);
}

.page-about section {
  scroll-margin-top: 6rem;
}

/* 面包屑 */
.page-about .breadcrumbs {
  padding-top: clamp(1rem, 3vw, 1.75rem);
}
.page-about .breadcrumbs ol {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: .5rem;
  margin: 0;
  padding: 0;
  font-family: var(--font-mono);
  font-size: .76rem;
  letter-spacing: .08em;
  color: var(--ice);
}
.page-about .breadcrumbs a {
  color: var(--ice);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color .2s var(--ease), border-color .2s var(--ease);
}
.page-about .breadcrumbs a:hover {
  color: var(--signal-soft);
  border-bottom-color: currentColor;
}
.page-about .breadcrumbs a:focus-visible {
  outline: 2px solid var(--signal-soft);
  outline-offset: 3px;
}
.page-about .breadcrumbs [aria-current="page"] {
  color: var(--fog);
}

/* 首屏 */
.page-about .about-hero {
  padding-block: clamp(1.5rem, 4vw, 2.75rem) clamp(2rem, 5vw, 3.5rem);
  border-bottom: 1px solid var(--about-line);
}
.page-about .about-hero__eyebrow {
  display: inline-flex;
  align-items: center;
  gap: .65rem;
  margin: 0;
  font-family: var(--font-mono);
  font-size: .76rem;
  letter-spacing: .18em;
  color: var(--ice);
}
.page-about .about-hero__mark {
  display: block;
  width: 30px;
  height: 2px;
  background: var(--signal);
}
.page-about .about-hero__title {
  margin: clamp(.9rem, 2.5vw, 1.35rem) 0 0;
  font-family: var(--font-head);
  font-weight: 800;
  font-size: clamp(1.85rem, 6.2vw, 3.75rem);
  line-height: 1.14;
  letter-spacing: -.01em;
  max-width: 15em;
  text-wrap: balance;
}
.page-about .about-hero__lede {
  margin: clamp(1rem, 2.5vw, 1.5rem) 0 0;
  max-width: 36em;
  font-size: clamp(.95rem, 1.7vw, 1.05rem);
  line-height: 1.9;
  color: var(--rock);
}

/* 首屏读数条 */
.page-about .about-meta {
  list-style: none;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1.35rem 1.5rem;
  margin: clamp(1.75rem, 4vw, 2.75rem) 0 0;
  padding: 0;
}
.page-about .about-meta__item {
  border-left: 2px solid var(--signal);
  padding-left: .85rem;
}
.page-about .about-meta__num {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(1.35rem, 3.4vw, 1.95rem);
  line-height: 1.1;
  color: var(--fog);
}
.page-about .about-meta__label {
  display: block;
  margin-top: .4rem;
  font-size: .78rem;
  letter-spacing: .06em;
  color: var(--ice);
}
@media (min-width: 760px) {
  .page-about .about-meta {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

/* 章节骨架 */
.page-about .about-sec {
  border-top: 1px solid var(--about-line);
  padding-block: clamp(2.5rem, 6vw, 4.5rem);
}
.page-about .about-sec:first-of-type {
  border-top: 0;
}
.page-about .about-sec__no {
  display: block;
  font-family: var(--font-mono);
  font-size: .82rem;
  letter-spacing: .2em;
  color: var(--signal);
}
.page-about .about-sec__title {
  margin: .55rem 0 0;
  font-family: var(--font-head);
  font-weight: 700;
  font-size: clamp(1.3rem, 3.2vw, 1.8rem);
  line-height: 1.32;
  letter-spacing: -.005em;
}
.page-about .about-sec__body {
  margin-top: clamp(1.5rem, 3.5vw, 2.25rem);
  min-width: 0;
}
.page-about .about-sec__body > p {
  margin: 0 0 1.05rem;
  max-width: 36em;
  font-size: .97rem;
  line-height: 1.88;
  color: var(--rock);
}
.page-about .about-sec__link-row {
  margin-top: clamp(1rem, 2.5vw, 1.5rem);
}
@media (min-width: 900px) {
  .page-about .about-sec {
    display: grid;
    grid-template-columns: minmax(0, 220px) minmax(0, 1fr);
    column-gap: clamp(2rem, 5vw, 4rem);
    align-items: start;
  }
  .page-about .about-sec__body {
    margin-top: 0;
    padding-top: .3rem;
  }
}

/* 图片 */
.page-about .about-figure {
  position: relative;
  margin: 0 0 clamp(1.25rem, 3vw, 1.9rem);
  border: 1px solid var(--about-line);
  background: var(--sea);
  overflow: hidden;
}
.page-about .about-figure img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  aspect-ratio: 3 / 2;
  object-fit: cover;
  filter: saturate(.8) contrast(1.04);
}
.page-about .about-figure--band img {
  aspect-ratio: 14 / 5;
}
.page-about .about-figure__cap {
  position: relative;
  z-index: 1;
  margin: 0;
  padding: .7rem .9rem;
  border-top: 1px solid var(--about-line);
  background: var(--sea);
  font-size: .78rem;
  line-height: 1.7;
  color: var(--ice);
}

/* 团队角色 */
.page-about .role-list {
  list-style: none;
  margin: clamp(1.25rem, 3vw, 1.75rem) 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1px;
  background: var(--about-line);
  border: 1px solid var(--about-line);
}
.page-about .role {
  display: grid;
  gap: .4rem;
  padding: 1.15rem 1.1rem 1.3rem;
  background: var(--ink);
  outline: none;
  transition: background .25s var(--ease);
}
.page-about .role:hover,
.page-about .role:focus-visible {
  background: var(--panel);
}
.page-about .role:focus-visible {
  box-shadow: inset 0 0 0 2px var(--signal-soft);
}
.page-about .role__count {
  font-family: var(--font-mono);
  font-size: 1.65rem;
  line-height: 1;
  color: var(--signal);
}
.page-about .role__name {
  font-family: var(--font-head);
  font-weight: 700;
  font-size: 1.05rem;
  color: var(--fog);
}
.page-about .role__desc {
  font-size: .87rem;
  line-height: 1.75;
  color: var(--ice);
}
@media (min-width: 680px) {
  .page-about .role-list {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

/* 流程五步 */
.page-about .flow {
  list-style: none;
  margin: clamp(1.25rem, 3vw, 1.75rem) 0 clamp(1.5rem, 3.5vw, 2rem);
  padding: 0;
  border-top: 1px solid var(--about-line);
}
.page-about .flow__item {
  border-bottom: 1px solid var(--about-line);
}
.page-about .flow__details {
  background: transparent;
}
.page-about .flow__sum {
  display: grid;
  grid-template-columns: 2.6rem minmax(0, 1fr) auto;
  align-items: center;
  gap: .75rem;
  padding: .95rem .4rem .95rem 0;
  cursor: pointer;
  list-style: none;
  outline: none;
  transition: background .25s var(--ease);
}
.page-about .flow__sum::-webkit-details-marker {
  display: none;
}
.page-about .flow__sum::marker {
  content: "";
}
.page-about .flow__sum:hover {
  background: var(--sea);
}
.page-about .flow__sum:focus-visible {
  outline: 2px solid var(--signal-soft);
  outline-offset: 2px;
}
.page-about .flow__sum::after {
  content: "+";
  justify-self: end;
  margin-right: .5rem;
  font-family: var(--font-mono);
  font-size: 1.1rem;
  color: var(--ice);
  transition: color .2s var(--ease);
}
.page-about .flow__details[open] > .flow__sum::after {
  content: "–";
  color: var(--signal);
}
.page-about .flow__no {
  font-family: var(--font-mono);
  font-size: .85rem;
  letter-spacing: .1em;
  color: var(--signal);
}
.page-about .flow__label {
  font-family: var(--font-head);
  font-weight: 700;
  font-size: 1rem;
  color: var(--fog);
}
.page-about .flow__text {
  margin: 0 0 1.15rem;
  max-width: 34em;
  font-size: .93rem;
  line-height: 1.85;
  color: var(--rock);
}
@media (min-width: 640px) {
  .page-about .flow__text {
    padding-left: 3.35rem;
  }
}

/* 历程 */
.page-about .timeline {
  list-style: none;
  margin: clamp(1.25rem, 3vw, 1.75rem) 0 0;
  padding: 0 0 0 1.5rem;
  border-left: 1px solid var(--about-line);
}
.page-about .timeline__item {
  position: relative;
  padding-bottom: 1.75rem;
}
.page-about .timeline__item:last-child {
  padding-bottom: 0;
}
.page-about .timeline__item::before {
  content: "";
  position: absolute;
  left: calc(-1.5rem - 5px);
  top: .5rem;
  width: 7px;
  height: 7px;
  background: var(--ink);
  border: 1px solid var(--signal);
  transform: rotate(45deg);
  transition: background .25s var(--ease);
}
.page-about .timeline__item:hover::before,
.page-about .timeline__item:focus-within::before {
  background: var(--signal);
}
.page-about .timeline__year {
  display: block;
  font-family: var(--font-mono);
  font-size: .84rem;
  letter-spacing: .1em;
  color: var(--signal);
}
.page-about .timeline__title {
  margin: .4rem 0 .45rem;
  font-family: var(--font-head);
  font-weight: 700;
  font-size: 1.02rem;
  color: var(--fog);
}
.page-about .timeline__text {
  margin: 0;
  max-width: 34em;
  font-size: .92rem;
  line-height: 1.8;
  color: var(--rock);
  opacity: .8;
  transition: opacity .25s var(--ease);
}
.page-about .timeline__item:hover .timeline__text,
.page-about .timeline__item:focus-within .timeline__text {
  opacity: 1;
}
@media (min-width: 760px) {
  .page-about .timeline__item {
    display: grid;
    grid-template-columns: 5.5rem minmax(0, 1fr);
    column-gap: 1.5rem;
    padding-bottom: 2rem;
  }
  .page-about .timeline__year {
    padding-top: .15rem;
  }
  .page-about .timeline__title {
    margin-top: 0;
  }
}

/* 覆盖范围读数 */
.page-about .reach {
  list-style: none;
  margin: 0 0 clamp(1.25rem, 3vw, 1.75rem);
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--about-line);
  border: 1px solid var(--about-line);
}
.page-about .reach li {
  display: grid;
  gap: .4rem;
  padding: 1rem .9rem 1.15rem;
  background: var(--sea);
}
.page-about .reach__num {
  font-family: var(--font-mono);
  font-size: clamp(1.4rem, 3.6vw, 1.9rem);
  line-height: 1.05;
  color: var(--fog);
}
.page-about .reach__num em {
  font-style: normal;
  color: var(--signal);
}
.page-about .reach__label {
  font-size: .78rem;
  letter-spacing: .05em;
  color: var(--ice);
}
@media (min-width: 760px) {
  .page-about .reach {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

/* 文内链接 */
.page-about .about-link {
  display: inline-flex;
  align-items: center;
  gap: .5rem;
  padding-bottom: .18rem;
  font-size: .92rem;
  color: var(--signal-soft);
  text-decoration: none;
  border-bottom: 1px solid rgba(255, 154, 94, .45);
  transition: color .2s var(--ease), border-color .2s var(--ease);
}
.page-about .about-link::after {
  content: "→";
  font-family: var(--font-mono);
}
.page-about .about-link:hover {
  color: var(--fog);
  border-bottom-color: var(--fog);
}
.page-about .about-link:focus-visible {
  outline: 2px solid var(--signal-soft);
  outline-offset: 3px;
}

/* 收束入口 */
.page-about .about-tail {
  border-top: 1px solid var(--about-line);
  padding-block: clamp(2.25rem, 5vw, 3.5rem) clamp(1.5rem, 3vw, 2rem);
}
.page-about .about-tail__title {
  margin: 0 0 clamp(1.25rem, 3vw, 1.75rem);
  font-family: var(--font-head);
  font-weight: 700;
  font-size: clamp(1.2rem, 2.9vw, 1.55rem);
  line-height: 1.35;
}
.page-about .tail-links {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1px;
  background: var(--about-line);
  border: 1px solid var(--about-line);
}
.page-about .tail-links li {
  display: grid;
  gap: .35rem;
  padding: 1.1rem 1.15rem 1.2rem;
  background: var(--ink);
  transition: background .25s var(--ease);
}
.page-about .tail-links li:hover {
  background: var(--sea);
}
.page-about .tail-links a {
  justify-self: start;
  font-family: var(--font-head);
  font-weight: 700;
  font-size: 1rem;
  color: var(--fog);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color .2s var(--ease), border-color .2s var(--ease);
}
.page-about .tail-links a:hover {
  color: var(--signal-soft);
  border-bottom-color: currentColor;
}
.page-about .tail-links a:focus-visible {
  outline: 2px solid var(--signal-soft);
  outline-offset: 3px;
}
.page-about .tail-links span {
  font-size: .86rem;
  line-height: 1.72;
  color: var(--ice);
}
@media (min-width: 760px) {
  .page-about .tail-links {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .role,
  .page-about .flow__sum,
  .page-about .timeline__text,
  .page-about .timeline__item::before,
  .page-about .tail-links li,
  .page-about .about-link {
    transition: none;
  }
}