.page-about {
  --about-rail: 92px;
  --about-gap: clamp(1.5rem, 4vw, 3.5rem);
  overflow-x: clip;
  padding-bottom: clamp(3rem, 8vw, 6rem);
}

/* ---------- 面包屑留白 ---------- */
.page-about .crumb {
  padding-top: clamp(1.25rem, 3vw, 2rem);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  padding-block: clamp(1.5rem, 4vw, 2.5rem) clamp(2.25rem, 5vw, 3.5rem);
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  right: 0;
  bottom: 0;
  width: min(340px, 46%);
  height: 3px;
  background: linear-gradient(90deg, rgba(53, 230, 213, 0), var(--cyan));
  opacity: .75;
}

.page-about .about-hero__title {
  margin: .85rem 0 0;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(1.9rem, 5.4vw, 3.6rem);
  line-height: 1.15;
  letter-spacing: .03em;
  color: var(--mist);
  max-width: 20ch;
}

.page-about .about-hero__lead {
  margin: 1.25rem 0 0;
  max-width: 64ch;
  font-size: clamp(1rem, 1.4vw, 1.12rem);
  line-height: 1.85;
  color: var(--body);
}

.page-about .about-hero__stats {
  list-style: none;
  margin: clamp(1.75rem, 4vw, 2.5rem) 0 0;
  padding: 0;
  display: grid;
  gap: 1px;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  background: var(--grid);
  border: var(--hairline);
  border-radius: var(--r-md);
  overflow: hidden;
}

@media (min-width: 860px) {
  .page-about .about-hero__stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

.page-about .about-hero__stats > li {
  display: grid;
  gap: .3rem;
  align-content: start;
  padding: clamp(.9rem, 2vw, 1.3rem) clamp(.9rem, 2vw, 1.25rem);
  background: linear-gradient(158deg, rgba(18, 59, 110, .45), rgba(5, 7, 12, .78) 70%);
}

.page-about .about-hero__stats .stat__value {
  font-family: var(--font-mono);
  font-size: clamp(1.5rem, 3vw, 2.1rem);
  font-weight: 700;
  line-height: 1.1;
  color: var(--gold);
  font-variant-numeric: tabular-nums;
}

.page-about .about-hero__stats .stat__label {
  font-size: .82rem;
  line-height: 1.5;
  color: var(--steel);
}

/* ---------- 年表式章节 ---------- */
.page-about .about-chapter {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1rem;
  padding-block: clamp(2.25rem, 5vw, 3.5rem);
  border-top: var(--hairline);
}

@media (min-width: 940px) {
  .page-about .about-chapter {
    grid-template-columns: var(--about-rail) minmax(0, 1fr);
    gap: var(--about-gap);
  }
}

.page-about .about-chapter__rail {
  display: flex;
  align-items: center;
  gap: .85rem;
}

.page-about .about-chapter__rail::after {
  content: "";
  flex: 1;
  height: 1px;
  background: linear-gradient(90deg, rgba(200, 145, 42, .85), rgba(36, 53, 79, 0));
}

@media (min-width: 940px) {
  .page-about .about-chapter__rail {
    position: relative;
    flex-direction: column;
    align-items: flex-start;
    gap: 0;
  }

  .page-about .about-chapter__rail::after {
    position: absolute;
    left: .45rem;
    top: 3.2rem;
    bottom: -.5rem;
    width: 1px;
    height: auto;
    flex: none;
    background: linear-gradient(180deg, rgba(200, 145, 42, .9), rgba(36, 53, 79, .12) 75%, rgba(36, 53, 79, 0));
  }
}

.page-about .about-chapter__num {
  font-family: var(--font-mono);
  font-weight: 800;
  font-size: clamp(1.75rem, 4vw, 2.75rem);
  line-height: 1;
  letter-spacing: .02em;
  color: var(--gold);
  opacity: .82;
  font-variant-numeric: tabular-nums;
}

.page-about .about-chapter__body {
  min-width: 0;
}

.page-about .about-chapter__body > .eyebrow {
  margin: 0;
}

.page-about .about-chapter__title {
  margin: .5rem 0 0;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(1.35rem, 3.1vw, 2.15rem);
  line-height: 1.28;
  letter-spacing: .035em;
  color: var(--mist);
  max-width: 26ch;
}

.page-about .about-chapter__text {
  margin: 1rem 0 0;
  max-width: 70ch;
  font-size: clamp(.96rem, 1.2vw, 1.04rem);
  line-height: 1.9;
  color: var(--body);
}

.page-about .about-chapter__text + .about-chapter__text {
  margin-top: .9rem;
}

.page-about .about-chapter__body h3 {
  margin: 1.75rem 0 0;
  font-family: var(--font-display);
  font-size: clamp(1.05rem, 1.7vw, 1.2rem);
  font-weight: 700;
  letter-spacing: .03em;
  color: var(--mist);
}

.page-about .about-chapter__text a,
.page-about .renew-note a {
  color: var(--cyan);
  text-decoration: underline;
  text-underline-offset: 3px;
}

.page-about .about-chapter__text a:hover,
.page-about .renew-note a:hover {
  color: var(--gold);
}

/* ---------- 城市路径卡 ---------- */
.page-about .city-lanes {
  list-style: none;
  margin: clamp(1.5rem, 3vw, 2.25rem) 0 0;
  padding: 0;
  display: grid;
  gap: .75rem;
}

@media (min-width: 760px) {
  .page-about .city-lanes {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

.page-about .city-lane {
  display: grid;
  gap: .35rem;
  padding: 1.1rem 1.15rem 1.2rem;
  border-radius: var(--r-md);
  border: var(--hairline);
  border-left: 2px solid var(--gold-deep);
  background: linear-gradient(160deg, rgba(18, 59, 110, .38), rgba(5, 7, 12, .72));
  transition: border-color .22s ease, transform .22s ease;
}

.page-about .city-lane:hover {
  border-left-color: var(--cyan);
  transform: translateY(-2px);
}

.page-about .city-lane__city {
  font-family: var(--font-display);
  font-size: 1.05rem;
  font-weight: 900;
  letter-spacing: .14em;
  color: var(--gold);
}

.page-about .city-lane__what {
  font-size: .95rem;
  font-weight: 600;
  color: var(--mist);
}

.page-about .city-lane__desc {
  font-size: .87rem;
  line-height: 1.75;
  color: var(--steel);
}

/* ---------- 中段数据带 ---------- */
.page-about .about-band {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: .85rem clamp(1.25rem, 4vw, 3rem);
  margin-block: clamp(1.25rem, 3vw, 2rem);
  padding: clamp(.9rem, 2vw, 1.2rem) clamp(1rem, 3vw, 1.75rem);
  border-radius: var(--r-md);
  border: var(--hairline);
  border-left: 3px solid var(--gold);
  background: linear-gradient(100deg, rgba(18, 59, 110, .52), rgba(5, 7, 12, .82) 58%, rgba(200, 145, 42, .14));
}

.page-about .about-band__item {
  display: flex;
  align-items: baseline;
  gap: .5rem;
  margin: 0;
}

.page-about .about-band__num {
  font-family: var(--font-mono);
  font-size: clamp(1.15rem, 2.4vw, 1.6rem);
  font-weight: 700;
  color: var(--cyan);
  font-variant-numeric: tabular-nums;
}

.page-about .about-band__cap {
  font-size: .85rem;
  letter-spacing: .02em;
  color: var(--steel);
}

/* ---------- 服务网络：城区点阵 ---------- */
.page-about .network-grid {
  margin-top: clamp(1.4rem, 3vw, 2rem);
  display: grid;
  gap: clamp(1rem, 3vw, 1.75rem);
}

@media (min-width: 900px) {
  .page-about .network-grid {
    grid-template-columns: minmax(0, 1.4fr) minmax(0, .8fr);
    align-items: start;
  }
}

.page-about .district-map {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: .5rem;
}

@media (min-width: 560px) {
  .page-about .district-map {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

.page-about .district {
  position: relative;
  display: grid;
  gap: .15rem;
  padding: .72rem .8rem;
  border-radius: var(--r-sm);
  border: 1px solid var(--grid);
  background: rgba(11, 26, 51, .55);
  transition: border-color .2s ease, background-color .2s ease;
}

.page-about .district:hover,
.page-about .district:focus-within {
  border-color: var(--gold-deep);
  background: rgba(18, 59, 110, .62);
}

.page-about .district__name {
  font-size: .95rem;
  font-weight: 600;
  letter-spacing: .04em;
  color: var(--mist);
}

.page-about .district__name::before {
  content: "";
  display: inline-block;
  width: 6px;
  height: 6px;
  margin-right: .42rem;
  border-radius: 50%;
  background: var(--steel);
  vertical-align: 1px;
}

.page-about .district--core .district__name::before {
  background: var(--cyan);
  box-shadow: 0 0 8px rgba(53, 230, 213, .7);
}

.page-about .district__meta {
  font-family: var(--font-mono);
  font-size: .7rem;
  line-height: 1.5;
  letter-spacing: .01em;
  color: var(--steel);
}

@media (min-width: 900px) {
  .page-about .district__meta {
    position: absolute;
    top: calc(100% + 6px);
    left: 0;
    z-index: 4;
    padding: .35rem .6rem;
    border-radius: var(--pill);
    border: 1px solid var(--gold-deep);
    background: var(--navy);
    color: var(--mist);
    white-space: nowrap;
    opacity: 0;
    transform: translateY(-4px);
    pointer-events: none;
    transition: opacity .18s ease, transform .18s ease;
    box-shadow: 0 14px 26px rgba(0, 0, 0, .5);
  }

  .page-about .district:hover .district__meta,
  .page-about .district:focus-within .district__meta {
    opacity: 1;
    transform: translateY(0);
  }
}

.page-about .network-grid__figure,
.page-about .team-grid__figure {
  margin: 0;
}

/* ---------- 团队梯队 ---------- */
.page-about .team-grid {
  margin-top: clamp(1.4rem, 3vw, 2rem);
  display: grid;
  gap: clamp(1rem, 3vw, 1.75rem);
}

@media (min-width: 900px) {
  .page-about .team-grid {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1.05fr);
    align-items: start;
  }
}

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

.page-about .team-stat {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  align-items: baseline;
  gap: .2rem .9rem;
  padding: .9rem 1rem;
  border-radius: var(--r-md);
  border: var(--hairline);
  border-left: 2px solid var(--gold-deep);
  background: rgba(11, 26, 51, .55);
  transition: border-left-color .22s ease;
}

.page-about .team-stat:hover {
  border-left-color: var(--cyan);
}

.page-about .team-stat__num {
  grid-row: span 2;
  font-family: var(--font-mono);
  font-size: clamp(1.5rem, 3vw, 2rem);
  font-weight: 700;
  line-height: 1;
  color: var(--gold);
  font-variant-numeric: tabular-nums;
}

.page-about .team-stat__name {
  font-size: .98rem;
  font-weight: 600;
  color: var(--mist);
}

.page-about .team-stat__desc {
  grid-column: 2;
  font-size: .84rem;
  line-height: 1.7;
  color: var(--steel);
}

.page-about .train-list {
  list-style: none;
  margin: clamp(1.25rem, 3vw, 1.75rem) 0 0;
  padding: 0;
  display: grid;
  gap: .6rem;
}

.page-about .train-list li {
  position: relative;
  padding-left: 1.4rem;
  font-size: .95rem;
  line-height: 1.8;
  color: var(--body);
}

.page-about .train-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: .78rem;
  width: .6rem;
  height: 1px;
  background: var(--cyan);
}

.page-about .train-list .mono {
  font-family: var(--font-mono);
  font-weight: 700;
  color: var(--gold);
  font-variant-numeric: tabular-nums;
}

/* ---------- 数据档案 ---------- */
.page-about .slot-list {
  list-style: none;
  margin: 1.25rem 0 0;
  padding: 0;
  display: grid;
  gap: .5rem;
}

@media (min-width: 640px) {
  .page-about .slot-list {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (min-width: 1024px) {
  .page-about .slot-list {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

.page-about .slot-list li {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: .75rem;
  padding: .8rem 1rem;
  border-radius: var(--r-sm);
  border: var(--hairline);
  background: rgba(11, 26, 51, .5);
}

.page-about .slot-list__time {
  font-family: var(--font-mono);
  font-size: .85rem;
  letter-spacing: .01em;
  color: var(--cyan);
  font-variant-numeric: tabular-nums;
}

.page-about .slot-list__name {
  font-size: .85rem;
  color: var(--steel);
}

.page-about .renew-block {
  margin-top: clamp(1.75rem, 4vw, 2.5rem);
  padding: clamp(1.1rem, 3vw, 1.6rem);
  border-radius: var(--r-lg);
  border: 1px solid rgba(200, 145, 42, .35);
  background: linear-gradient(155deg, rgba(200, 145, 42, .1), rgba(5, 7, 12, .72) 55%);
}

.page-about .renew-block > :first-child {
  margin-top: 0;
}

.page-about .renew-bars {
  display: grid;
  gap: 1rem;
  margin-top: 1.25rem;
}

.page-about .renew-bar {
  display: grid;
  grid-template-columns: 3.4rem minmax(0, 1fr) auto;
  align-items: center;
  gap: .8rem;
}

.page-about .renew-bar__year {
  font-family: var(--font-mono);
  font-size: .85rem;
  color: var(--steel);
  font-variant-numeric: tabular-nums;
}

.page-about .renew-bar__track {
  position: relative;
  height: 10px;
  border-radius: var(--pill);
  background: rgba(36, 53, 79, .8);
  overflow: hidden;
}

.page-about .renew-bar__fill {
  display: block;
  height: 100%;
  border-radius: var(--pill);
  background: linear-gradient(90deg, rgba(53, 230, 213, .8), var(--cyan));
}

.page-about .renew-bar__fill--a {
  width: 45%;
}

.page-about .renew-bar__fill--b {
  width: 61%;
  background: linear-gradient(90deg, rgba(200, 145, 42, .85), var(--gold));
}

.page-about .renew-bar__val {
  font-family: var(--font-mono);
  font-size: .82rem;
  color: var(--mist);
  white-space: nowrap;
  font-variant-numeric: tabular-nums;
}

@media (max-width: 559px) {
  .page-about .renew-bar {
    grid-template-columns: minmax(0, 1fr);
    gap: .4rem;
  }

  .page-about .renew-bar__val {
    justify-self: start;
  }
}

.page-about .renew-note {
  margin: 1.1rem 0 0;
  font-size: .9rem;
  line-height: 1.8;
  color: var(--steel);
}

.page-about .data-figure {
  margin: clamp(1.5rem, 4vw, 2.25rem) 0 0;
}

/* ---------- 协作生态 ---------- */
.page-about .eco-list {
  list-style: none;
  margin: clamp(1.25rem, 3vw, 1.75rem) 0 0;
  padding: 0;
  display: grid;
  gap: .75rem;
}

@media (min-width: 720px) {
  .page-about .eco-list {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

.page-about .eco-item {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  align-items: center;
  gap: .9rem;
  padding: .95rem 1.1rem;
  border-radius: var(--r-md);
  border: var(--hairline);
  background: rgba(11, 26, 51, .45);
  transition: border-color .22s ease, transform .22s ease;
}

.page-about .eco-item:hover {
  border-color: var(--gold-deep);
  transform: translateY(-2px);
}

.page-about .eco-item__num {
  min-width: 2.7rem;
  font-family: var(--font-mono);
  font-size: clamp(1.35rem, 2.6vw, 1.75rem);
  font-weight: 700;
  color: var(--gold);
  font-variant-numeric: tabular-nums;
}

.page-about .eco-item__name {
  font-size: .9rem;
  line-height: 1.65;
  color: var(--body);
}

/* ---------- 对接按钮组 ---------- */
.page-about .cta-row {
  display: flex;
  flex-wrap: wrap;
  gap: .75rem;
  margin-top: clamp(1.4rem, 3vw, 2rem);
}

/* ---------- 减弱动效 ---------- */
@media (prefers-reduced-motion: reduce) {
  .page-about .city-lane,
  .page-about .eco-item,
  .page-about .district,
  .page-about .district__meta {
    transition: none !important;
    transform: none !important;
  }

  .page-about .district__meta {
    opacity: 1;
  }
}