.page-about {
  --about-rail: 132px;
  display: block;
  padding-block: clamp(1.25rem, 3.5vw, 2.5rem) clamp(3rem, 8vw, 5.5rem);
  color: var(--ice);
  font-family: var(--font-sans);
  font-size: 1rem;
  line-height: 1.7;
  overflow-x: clip;
}

.page-about .breadcrumb {
  margin-bottom: clamp(1rem, 3vw, 1.75rem);
}

/* ---------- 开场 ---------- */
.page-about .about-hero {
  display: grid;
  gap: clamp(1.5rem, 4vw, 2.75rem);
  padding-bottom: clamp(1.75rem, 4vw, 3rem);
  border-bottom: 1px solid var(--line);
}

.page-about .about-hero__title {
  margin: .5rem 0 1rem;
  max-width: 20ch;
  font-family: var(--font-display);
  font-size: clamp(1.85rem, 5.2vw, 3.25rem);
  font-weight: 800;
  line-height: 1.14;
  letter-spacing: -.02em;
  color: var(--ice-bright);
}

.page-about .about-hero__copy .lede {
  max-width: 36em;
  margin: 0;
}

.page-about .about-hero__facts {
  display: flex;
  flex-wrap: wrap;
  gap: .5rem .7rem;
  margin: 1.5rem 0 0;
  padding: 0;
  list-style: none;
}

.page-about .about-hero__facts li {
  display: inline-flex;
  align-items: baseline;
  gap: .4rem;
  padding: .4rem .9rem;
  border: 1px solid var(--line-strong);
  border-radius: var(--pill);
  background: rgba(18, 52, 48, .45);
  font-size: .875rem;
  color: var(--ice-dim);
}

.page-about .about-hero__facts .num {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: 1.0625rem;
  font-weight: 700;
  color: var(--amber);
}

.page-about .about-hero__figure {
  margin: 0;
}

.page-about .about-hero__figure img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
}

@media (min-width: 880px) {
  .page-about .about-hero {
    grid-template-columns: minmax(0, 1.25fr) minmax(0, .85fr);
    align-items: end;
  }
}

/* ---------- 阅读布局 ---------- */
.page-about .read-layout {
  margin-top: clamp(2rem, 5vw, 3.5rem);
}

.page-about .read-column {
  min-width: 0;
}

.page-about .section {
  padding-block: clamp(1.75rem, 4vw, 2.75rem);
  border-top: 1px solid var(--line);
}

.page-about .read-column > .section:first-child {
  border-top: 0;
  padding-top: 0;
}

.page-about .section .lede {
  margin: 0;
}

.page-about .metric-item__desc,
.page-about .team-legend__scope,
.page-about .team-legend__detail {
  font-size: .9rem;
  line-height: 1.65;
}

/* ---------- 章节指示 ---------- */
.page-about .chapter-rail {
  display: none;
}

.page-about .chapter-rail__list {
  margin: 0;
  padding: 0 0 0 1rem;
  list-style: none;
  border-left: 1px solid var(--line);
  display: grid;
  gap: .95rem;
}

.page-about .chapter-rail__link {
  position: relative;
  display: block;
  font-size: .8125rem;
  letter-spacing: .06em;
  color: var(--ice-dim);
  text-decoration: none;
  transition: color .2s var(--ease);
}

.page-about .chapter-rail__link::before {
  content: "";
  position: absolute;
  left: calc(-1rem - 3.5px);
  top: .55em;
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--ink-700);
  transition: background .2s var(--ease), transform .2s var(--ease), box-shadow .2s var(--ease);
}

.page-about .chapter-rail__link:hover {
  color: var(--ice-bright);
}

.page-about .chapter-rail__link.is-active {
  color: var(--amber);
}

.page-about .chapter-rail__link.is-active::before {
  background: var(--amber);
  transform: scale(1.35);
  box-shadow: 0 0 0 4px rgba(255, 158, 44, .16);
}

@media (min-width: 1040px) {
  .page-about .read-layout {
    display: grid;
    grid-template-columns: minmax(0, 1fr) var(--about-rail);
    gap: clamp(2rem, 5vw, 4rem);
    align-items: start;
  }

  .page-about .read-column {
    max-width: 72ch;
  }

  .page-about .chapter-rail {
    display: block;
    position: sticky;
    top: 6.5rem;
  }
}

/* ---------- 刻度年表 ---------- */
.page-about .timeline {
  position: relative;
  display: flex;
  gap: .85rem;
  margin: 1.75rem 0 0;
  padding: 2.4rem .25rem .75rem;
  list-style: none;
  overflow-x: auto;
  scroll-snap-type: x proximity;
  -webkit-overflow-scrolling: touch;
}

.page-about .timeline::before {
  content: "";
  position: absolute;
  top: 1.2rem;
  left: 0;
  right: 0;
  height: 1px;
  background-image: repeating-linear-gradient(90deg, var(--line-strong) 0 1px, transparent 1px 9px);
}

.page-about .timeline::-webkit-scrollbar {
  height: 4px;
}

.page-about .timeline::-webkit-scrollbar-thumb {
  background: var(--ink-700);
  border-radius: var(--pill);
}

.page-about .timeline__item {
  flex: 1 0 232px;
  scroll-snap-align: start;
}

.page-about .tl-node {
  position: relative;
  display: block;
  height: 100%;
  padding: 1.1rem 1rem 1.2rem;
  border: 1px solid var(--line);
  border-radius: var(--r-md);
  background: linear-gradient(180deg, rgba(18, 52, 48, .72), rgba(11, 31, 28, .78));
  color: inherit;
  text-decoration: none;
  transition: border-color .2s var(--ease), transform .2s var(--ease), background .2s var(--ease);
}

.page-about .tl-node::before {
  content: "";
  position: absolute;
  top: -1.65rem;
  left: 1rem;
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--ink-900);
  border: 2px solid var(--cyan);
}

a.tl-node:hover,
a.tl-node:focus-visible {
  border-color: rgba(255, 158, 44, .55);
  background: linear-gradient(180deg, rgba(30, 74, 68, .8), rgba(11, 31, 28, .82));
  transform: translateY(-2px);
}

.page-about .tl-node:focus-visible {
  outline: 2px solid var(--amber);
  outline-offset: 3px;
}

.page-about .tl-node__year {
  display: block;
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: 1.375rem;
  font-weight: 700;
  line-height: 1;
  color: var(--amber);
}

.page-about .tl-node__title {
  display: block;
  margin-top: .6rem;
  font-size: 1.0625rem;
  font-weight: 700;
  color: var(--ice-bright);
}

.page-about .tl-node__desc {
  display: block;
  margin-top: .4rem;
  font-size: .875rem;
  line-height: 1.6;
  color: var(--ice-dim);
}

/* ---------- 团队 ---------- */
.page-about .team-bars {
  display: flex;
  gap: 2px;
  height: 16px;
  margin: 1.75rem 0 0;
  border: 1px solid var(--line);
  border-radius: var(--pill);
  background: var(--ink-850);
  overflow: hidden;
}

.page-about .team-bars__seg {
  display: block;
  height: 100%;
}

.page-about .team-bars__seg--edit {
  flex: 24 1 0;
  background: var(--cyan);
}

.page-about .team-bars__seg--eng {
  flex: 9 1 0;
  background: var(--violet);
}

.page-about .team-bars__seg--cs {
  flex: 6 1 0;
  background: var(--amber);
}

.page-about .team-legend {
  display: grid;
  gap: .65rem;
  margin: 1.25rem 0 0;
  padding: 0;
  list-style: none;
}

.page-about .team-legend__item {
  padding: .85rem 1rem;
  border: 1px solid var(--line);
  border-left: 3px solid var(--ink-700);
  border-radius: var(--r-sm);
  background: rgba(15, 42, 38, .5);
  transition: border-left-color .2s var(--ease), background .2s var(--ease);
}

.page-about .team-legend__head {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: .75rem;
}

.page-about .team-legend__name {
  font-size: .9375rem;
  font-weight: 700;
  color: var(--ice-bright);
}

.page-about .team-legend__num {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: 1.0625rem;
  color: var(--amber);
}

.page-about .team-legend__scope {
  margin: .35rem 0 0;
  color: var(--ice-dim);
}

.page-about .team-legend__detail {
  margin: .45rem 0 0;
  color: var(--ice);
}

.page-about .team-legend__item:hover {
  border-left-color: var(--amber);
  background: rgba(18, 52, 48, .72);
}

@media (hover: hover) and (min-width: 760px) {
  .page-about .team-legend__detail {
    max-height: 0;
    margin-top: 0;
    opacity: 0;
    overflow: hidden;
    transition: max-height .28s var(--ease), opacity .28s var(--ease), margin-top .28s var(--ease);
  }

  .page-about .team-legend__item:hover .team-legend__detail,
  .page-about .team-legend__item:focus-within .team-legend__detail {
    max-height: 8rem;
    margin-top: .45rem;
    opacity: 1;
  }
}

.page-about .team-figure {
  margin: 1.75rem 0 0;
}

.page-about .team-figure img,
.page-about .fans-layout__figure img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
}

/* ---------- 板块口径 ---------- */
.page-about .league-tags {
  display: flex;
  flex-wrap: wrap;
  gap: .5rem;
  margin: 1.5rem 0 0;
  padding: 0;
  list-style: none;
}

.page-about .metric-grid {
  display: grid;
  gap: .75rem;
  margin: 1.25rem 0 0;
  padding: 0;
  list-style: none;
}

.page-about .metric-item {
  padding: 1rem 1.05rem;
  border: 1px solid var(--line);
  border-radius: var(--r-md);
  background: rgba(15, 42, 38, .45);
}

.page-about .metric-item__label {
  margin: 0;
  font-family: var(--font-display);
  font-size: .75rem;
  font-weight: 700;
  letter-spacing: .1em;
  color: var(--amber-soft);
}

.page-about .metric-item__desc {
  margin: .5rem 0 0;
  color: var(--ice-dim);
}

@media (min-width: 620px) {
  .page-about .metric-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (min-width: 1040px) {
  .page-about .metric-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

/* ---------- 广深视角 ---------- */
.page-about .fans-layout {
  display: grid;
  gap: 1.5rem;
  margin-top: 1.5rem;
}

.page-about .fans-layout p {
  margin: 0 0 .9rem;
}

.page-about .fans-layout p:last-child {
  margin-bottom: 0;
}

.page-about .fans-layout__figure {
  margin: 0;
}

@media (min-width: 880px) {
  .page-about .fans-layout {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
    align-items: center;
  }
}

/* ---------- 纠错 ---------- */
.page-about .correction-steps {
  display: grid;
  gap: .8rem;
  margin: 1.5rem 0;
  padding: 0;
  list-style: none;
  counter-reset: cs;
}

.page-about .correction-steps li {
  position: relative;
  padding-left: 3.1rem;
  font-size: .9375rem;
  color: var(--ice);
}

.page-about .correction-steps li::before {
  content: counter(cs, decimal-leading-zero);
  position: absolute;
  left: 0;
  top: .05rem;
  padding: .15rem .4rem;
  border: 1px solid var(--line-strong);
  border-radius: var(--r-sm);
  font-family: var(--font-mono);
  font-size: .8125rem;
  color: var(--cyan);
  counter-increment: cs;
}

/* ---------- 结尾 ---------- */
.page-about .about-next {
  margin-top: clamp(2rem, 5vw, 3.5rem);
  padding: clamp(1.5rem, 4vw, 2.25rem);
  border: 1px solid var(--line);
  border-radius: var(--r-lg);
  background: linear-gradient(135deg, rgba(30, 74, 68, .55), rgba(11, 31, 28, .6));
}

.page-about .about-next__title {
  margin: 0;
  font-family: var(--font-display);
  font-size: clamp(1.25rem, 3vw, 1.6rem);
  font-weight: 800;
  letter-spacing: -.01em;
  color: var(--ice-bright);
}

.page-about .about-next__desc {
  max-width: 56ch;
  margin: .75rem 0 0;
  color: var(--ice-dim);
}

.page-about .about-next__actions {
  display: flex;
  flex-wrap: wrap;
  gap: .75rem;
  margin-top: 1.35rem;
}

.page-about .data-note a {
  color: var(--amber-soft);
}