.page-about {
  display: block;
}

.page-about .about-hero {
  position: relative;
  padding: clamp(24px, 4vw, 44px) 0 clamp(36px, 6vw, 76px);
  border-bottom: 1px solid var(--line);
  overflow: hidden;
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background:
    radial-gradient(circle at 88% 12%, rgba(139, 92, 255, 0.16), transparent 46%),
    radial-gradient(circle at 6% 88%, rgba(60, 242, 222, 0.07), transparent 40%);
  pointer-events: none;
}

.page-about .about-hero::after {
  content: none;
}

.page-about .about-hero__inner {
  position: relative;
  display: grid;
  gap: clamp(28px, 4vw, 48px);
  margin-top: clamp(18px, 3vw, 34px);
}

.page-about .about-hero__title {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(30px, 6vw, 62px);
  line-height: 1.04;
  letter-spacing: 0.03em;
  color: var(--fog);
  margin: 14px 0 20px;
  text-wrap: balance;
}

.page-about .about-hero__title em {
  font-style: normal;
  color: var(--violet);
}

.page-about .about-hero__lede {
  max-width: 52ch;
  margin: 0;
  color: var(--fog);
  opacity: 0.82;
  font-size: clamp(15px, 1.6vw, 17px);
  line-height: 1.85;
}

.page-about .about-index {
  list-style: none;
  margin: 12px 0 0;
  padding: 0;
  border-top: 1px solid var(--line);
}

.page-about .about-index__item {
  border-bottom: 1px solid var(--line);
}

.page-about .about-index__link {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 14px;
  align-items: baseline;
  padding: 13px 2px;
  text-decoration: none;
  color: inherit;
  transition: background 140ms var(--ease), padding-left 140ms var(--ease);
}

.page-about .about-index__link:hover,
.page-about .about-index__link:focus-visible {
  background: rgba(139, 92, 255, 0.12);
  padding-left: 12px;
}

.page-about .about-index__num {
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--violet);
}

.page-about .about-index__text {
  display: block;
  min-width: 0;
}

.page-about .about-index__name {
  display: block;
  color: var(--fog);
  font-size: 16px;
  font-weight: 600;
  letter-spacing: 0.02em;
}

.page-about .about-index__desc {
  display: block;
  margin-top: 4px;
  color: var(--steel);
  font-size: 12.5px;
  line-height: 1.6;
}

@media (min-width: 900px) {
  .page-about .about-hero::after {
    content: "";
    position: absolute;
    top: 0;
    bottom: 0;
    right: clamp(20px, 6vw, 110px);
    width: 1px;
    background: linear-gradient(180deg, transparent, var(--line-strong) 28%, var(--line-strong) 72%, transparent);
    pointer-events: none;
  }

  .page-about .about-hero__inner {
    grid-template-columns: minmax(0, 8fr) minmax(0, 4fr);
    align-items: end;
    gap: clamp(32px, 5vw, 72px);
  }
}

/* ---------- 章节通用节奏 ---------- */
.page-about > section {
  padding: clamp(40px, 6vw, 88px) 0;
  border-top: 1px solid var(--line);
  scroll-margin-top: calc(var(--h-arena) + var(--h-nav) + 24px);
}

.page-about .section-head {
  margin-bottom: clamp(24px, 3.4vw, 40px);
}

.page-about .about-origin__grid {
  display: grid;
  gap: clamp(24px, 4vw, 52px);
  align-items: start;
}

.page-about .about-origin__text p {
  margin: 0 0 16px;
  color: var(--fog);
  opacity: 0.82;
  line-height: 1.9;
}

.page-about .about-origin__tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  list-style: none;
  margin: 22px 0 0;
  padding: 0;
}

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

.page-about .about-origin__media .media-frame {
  overflow: hidden;
  border: 1px solid var(--line);
}

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

.page-about .about-origin__caption {
  display: block;
  margin-top: 10px;
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--steel);
}

@media (min-width: 900px) {
  .page-about .about-origin__grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
  }
}

/* ---------- 时间线 ---------- */
.page-about .about-timeline__layout {
  display: grid;
  gap: clamp(18px, 3vw, 36px);
}

.page-about .about-timeline__rail {
  list-style: none;
  margin: 0;
  padding: 0 0 6px;
  display: flex;
  gap: 8px;
  overflow-x: auto;
  scrollbar-width: thin;
}

.page-about .about-timeline__rail-link {
  display: inline-block;
  padding: 7px 13px;
  border: 1px solid var(--line);
  color: var(--steel);
  font-size: 12px;
  letter-spacing: 0.14em;
  text-decoration: none;
  white-space: nowrap;
  transition: color 140ms var(--ease), border-color 140ms var(--ease), background 140ms var(--ease);
}

.page-about .about-timeline__rail-link:hover,
.page-about .about-timeline__rail-link:focus-visible {
  color: var(--on-accent);
  background: var(--violet);
  border-color: var(--violet);
}

.page-about .about-stage {
  position: relative;
  margin: 0 0 16px;
  padding: clamp(18px, 2.6vw, 30px);
  background: var(--graphite);
  border: 1px solid var(--line);
  border-left: 2px solid var(--violet);
  transition: background 160ms var(--ease), border-color 160ms var(--ease);
}

.page-about .about-stage:hover,
.page-about .about-stage:focus-within {
  background: var(--glass);
  border-color: var(--line-strong);
  border-left-color: var(--cyan);
}

.page-about .about-stage--now {
  border-left-color: var(--amber);
}

.page-about .about-stage__index {
  margin: 0 0 10px;
  font-size: 11.5px;
  letter-spacing: 0.16em;
  color: var(--violet);
}

.page-about .about-stage--now .about-stage__index {
  color: var(--amber);
}

.page-about .about-stage__title {
  margin: 0 0 12px;
  font-family: var(--font-display);
  font-size: clamp(19px, 2.4vw, 25px);
  font-weight: 700;
  letter-spacing: 0.03em;
  line-height: 1.3;
  color: var(--fog);
}

.page-about .about-stage p {
  margin: 0 0 14px;
  color: var(--fog);
  opacity: 0.8;
  line-height: 1.85;
}

.page-about .about-stage__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 7px;
}

.page-about .about-stage__list li {
  position: relative;
  padding-left: 16px;
  color: var(--steel);
  font-size: 13.5px;
  line-height: 1.7;
}

.page-about .about-stage__list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.72em;
  width: 6px;
  height: 1px;
  background: var(--cyan);
}

@media (min-width: 860px) {
  .page-about .about-timeline__layout {
    grid-template-columns: 128px minmax(0, 1fr);
    gap: clamp(24px, 4vw, 56px);
  }

  .page-about .about-timeline__rail {
    position: sticky;
    top: calc(var(--h-arena) + var(--h-nav) + 28px);
    align-self: start;
    flex-direction: column;
    gap: 0;
    overflow: visible;
    padding: 0;
    border-left: 1px solid var(--line-strong);
  }

  .page-about .about-timeline__rail li {
    position: relative;
  }

  .page-about .about-timeline__rail-link {
    display: block;
    padding: 10px 0 10px 16px;
    border: 0;
    border-left: 1px solid transparent;
    margin-left: -1px;
    background: none;
  }

  .page-about .about-timeline__rail-link:hover,
  .page-about .about-timeline__rail-link:focus-visible {
    color: var(--cyan);
    background: none;
    border-left-color: var(--cyan);
  }
}

/* ---------- 覆盖网络 ---------- */
.page-about .about-network__intro,
.page-about .about-eco__intro {
  max-width: 62ch;
  margin: 14px 0 0;
  color: var(--fog);
  opacity: 0.8;
  line-height: 1.85;
  font-size: 15.5px;
}

.page-about .about-network__stats {
  list-style: none;
  margin: 0 0 clamp(24px, 4vw, 44px);
  padding: 1px 0 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
}

.page-about .about-network__stat {
  background: var(--void);
  padding: 18px 14px;
}

.page-about .about-network__stat-value {
  display: block;
  font-size: clamp(26px, 4vw, 38px);
  line-height: 1;
  color: var(--violet);
  letter-spacing: 0.02em;
}

.page-about .about-network__stat-label {
  display: block;
  margin-top: 8px;
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--steel);
}

.page-about .about-network__body {
  display: grid;
  gap: clamp(22px, 3.4vw, 40px);
  align-items: start;
}

.page-about .about-network__hint {
  margin: 0 0 12px;
  font-size: 11.5px;
  letter-spacing: 0.14em;
  color: var(--steel);
}

.page-about .about-city-grid {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(140px, 1fr));
  gap: 8px;
}

.page-about .about-city {
  position: relative;
  padding: 13px 13px 14px;
  background: var(--graphite);
  border: 1px solid var(--line);
  border-top: 2px solid var(--line-strong);
  transition: background 140ms var(--ease), border-color 140ms var(--ease);
}

.page-about .about-city:hover,
.page-about .about-city:focus-within,
.page-about .about-city:focus {
  background: var(--glass);
  border-color: var(--line-strong);
  outline: none;
}

.page-about .about-city--more {
  border-top-color: var(--cyan);
}

.page-about .about-city__name {
  display: block;
  color: var(--fog);
  font-size: 15px;
  font-weight: 600;
  letter-spacing: 0.04em;
}

.page-about .about-city__count {
  display: block;
  margin-top: 4px;
  font-size: 11px;
  letter-spacing: 0.14em;
  color: var(--steel);
}

.page-about .about-city__brief {
  margin: 8px 0 0;
  font-size: 12px;
  line-height: 1.65;
  color: var(--steel);
  opacity: 0;
  transform: translateY(-4px);
  transition: opacity 160ms var(--ease), transform 160ms var(--ease);
}

.page-about .about-city:hover .about-city__brief,
.page-about .about-city:focus .about-city__brief,
.page-about .about-city:focus-within .about-city__brief {
  opacity: 1;
  transform: none;
}

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

.page-about .about-network__media img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
  border: 1px solid var(--line);
}

.page-about .about-network__caption {
  display: block;
  margin-top: 10px;
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--steel);
}

@media (hover: none) {
  .page-about .about-city__brief {
    opacity: 1;
    transform: none;
  }
}

@media (min-width: 720px) {
  .page-about .about-network__stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

@media (min-width: 960px) {
  .page-about .about-network__body {
    grid-template-columns: minmax(0, 6fr) minmax(0, 6fr);
  }
}

/* ---------- 团队 ---------- */
.page-about .about-team__grid {
  display: grid;
  gap: clamp(24px, 4vw, 52px);
  align-items: start;
}

.page-about .about-team__text p {
  margin: 0 0 16px;
  color: var(--fog);
  opacity: 0.82;
  line-height: 1.9;
}

.page-about .about-team__text .btn {
  margin-top: 10px;
}

.page-about .about-team__side {
  display: grid;
  gap: 18px;
}

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

.page-about .about-team__media img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
  border: 1px solid var(--line);
}

.page-about .about-team__bars {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 13px;
}

.page-about .about-team__bar-head {
  display: flex;
  justify-content: space-between;
  gap: 12px;
  margin-bottom: 6px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.1em;
  color: var(--steel);
}

.page-about .about-team__bar-track {
  display: block;
  height: 7px;
  background: rgba(141, 147, 163, 0.16);
}

.page-about .about-team__bar-fill {
  display: block;
  height: 100%;
  background: linear-gradient(90deg, var(--violet-deep), var(--violet));
}

@media (min-width: 900px) {
  .page-about .about-team__grid {
    grid-template-columns: minmax(0, 6fr) minmax(0, 6fr);
  }
}

/* ---------- 服务标准 ---------- */
.page-about .about-service__layout {
  display: grid;
  gap: clamp(26px, 4vw, 52px);
  align-items: start;
}

.page-about .about-service__subtitle {
  margin: 0 0 16px;
  font-family: var(--font-display);
  font-size: clamp(17px, 2vw, 21px);
  font-weight: 700;
  letter-spacing: 0.04em;
  color: var(--fog);
}

.page-about .about-tiers {
  list-style: none;
  margin: 0 0 26px;
  padding: 0;
  display: grid;
  gap: 8px;
}

.page-about .about-tier {
  padding: 13px 14px;
  background: var(--graphite);
  border: 1px solid var(--line);
  border-left: 2px solid var(--violet-deep);
}

.page-about .about-tier--top {
  border-left-color: var(--amber);
}

.page-about .about-tier__mark {
  display: block;
  font-size: 11px;
  letter-spacing: 0.16em;
  color: var(--steel);
}

.page-about .about-tier__name {
  display: block;
  margin-top: 5px;
  color: var(--fog);
  font-size: 16px;
  font-weight: 600;
  letter-spacing: 0.06em;
}

.page-about .about-tier__desc {
  margin: 7px 0 0;
  font-size: 12.5px;
  line-height: 1.65;
  color: var(--steel);
}

.page-about .about-service__figures {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
}

.page-about .about-service__figures .data-figure {
  background: var(--void);
  padding: 15px 13px;
}

.page-about .about-service__figures .data-figure__value {
  display: block;
  font-size: clamp(19px, 2.6vw, 26px);
  line-height: 1.1;
  color: var(--cyan);
  letter-spacing: 0.02em;
}

.page-about .about-service__figures .data-figure__label {
  display: block;
  margin-top: 7px;
  font-size: 11.5px;
  letter-spacing: 0.06em;
  color: var(--steel);
}

.page-about .about-standards {
  margin: 0 0 24px;
  padding: 0;
  border-top: 1px solid var(--line);
}

.page-about .about-standards__row {
  display: grid;
  gap: 4px;
  padding: 13px 0;
  border-bottom: 1px solid var(--line);
}

.page-about .about-standards__row dt {
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.12em;
  color: var(--violet);
}

.page-about .about-standards__row dd {
  margin: 0;
  color: var(--fog);
  opacity: 0.84;
  font-size: 14px;
  line-height: 1.7;
}

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

  .page-about .about-standards__row {
    grid-template-columns: 148px minmax(0, 1fr);
    gap: 16px;
    align-items: baseline;
  }
}

@media (min-width: 720px) {
  .page-about .about-tiers {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .page-about .about-service__figures {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

@media (min-width: 960px) {
  .page-about .about-service__layout {
    grid-template-columns: minmax(0, 6fr) minmax(0, 6fr);
  }
}

/* ---------- 合作生态 ---------- */
.page-about .about-eco__list {
  border-top: 1px solid var(--line-strong);
}

.page-about .about-eco__item {
  border-bottom: 1px solid var(--line);
}

.page-about .about-eco__summary {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr) auto;
  gap: 12px;
  align-items: center;
  padding: 16px 4px;
  cursor: pointer;
  list-style: none;
  transition: background 140ms var(--ease), padding-left 140ms var(--ease);
}

.page-about .about-eco__summary::-webkit-details-marker {
  display: none;
}

.page-about .about-eco__summary:hover,
.page-about .about-eco__summary:focus-visible {
  background: rgba(139, 92, 255, 0.1);
  padding-left: 12px;
  outline: none;
}

.page-about .about-eco__num {
  font-size: 11.5px;
  letter-spacing: 0.16em;
  color: var(--violet);
}

.page-about .about-eco__name {
  color: var(--fog);
  font-size: 16px;
  font-weight: 600;
  letter-spacing: 0.05em;
}

.page-about .about-eco__count {
  font-size: 11.5px;
  letter-spacing: 0.1em;
  color: var(--steel);
  white-space: nowrap;
}

.page-about .about-eco__item[open] .about-eco__summary {
  border-bottom: 1px solid var(--line);
}

.page-about .about-eco__item[open] .about-eco__num {
  color: var(--cyan);
}

.page-about .about-eco__body {
  padding: 16px 4px 20px;
}

.page-about .about-eco__body p {
  margin: 0 0 12px;
  max-width: 70ch;
  color: var(--fog);
  opacity: 0.8;
  line-height: 1.85;
  font-size: 14.5px;
}

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

.page-about .about-eco__cta {
  margin-top: clamp(26px, 4vw, 44px);
  padding: clamp(20px, 3vw, 30px);
  background: linear-gradient(115deg, rgba(75, 34, 168, 0.4), rgba(8, 7, 13, 0.1) 70%);
  border: 1px solid var(--line-strong);
  display: grid;
  gap: 16px;
  align-items: center;
}

.page-about .about-eco__cta-text {
  margin: 0;
  color: var(--fog);
  font-size: clamp(15px, 1.8vw, 18px);
  line-height: 1.7;
  letter-spacing: 0.02em;
}

@media (min-width: 760px) {
  .page-about .about-eco__cta {
    grid-template-columns: minmax(0, 1fr) auto;
    gap: 28px;
  }
}

@media (min-width: 860px) {
  .page-about .about-eco__summary {
    grid-template-columns: 48px 200px minmax(0, 1fr);
    gap: 20px;
  }

  .page-about .about-eco__count {
    justify-self: end;
  }

  .page-about .about-eco__body {
    padding-left: 268px;
  }
}
<<<END>>>