.page-about {
  --about-hair: rgba(199, 208, 219, .18);
  --about-rail: 84px;
  --about-fade: linear-gradient(160deg, rgba(14, 39, 69, .82), rgba(7, 20, 38, .28));
  color: var(--silver);
  overflow-x: hidden;
}

.page-about .about-crumb {
  padding-top: 30px;
}

/* ---------- 首屏陈述 ---------- */
.page-about .about-hero {
  padding-top: 36px;
}

.page-about .about-hero__title {
  margin: 18px 0 0;
  max-width: 16em;
  color: var(--porcelain);
}

.page-about .about-hero__lede {
  margin-top: 26px;
  max-width: 44em;
}

.page-about .about-hero__lede p {
  margin: 0 0 14px;
  font-size: 16px;
  line-height: 1.9;
  color: var(--silver);
}

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

.page-about .about-stats {
  list-style: none;
  margin: 52px 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  border-top: 1px solid var(--about-hair);
}

.page-about .about-stats__item {
  display: flex;
  flex-direction: column;
  gap: 10px;
  padding: 24px 18px 26px 0;
  border-bottom: 1px solid var(--about-hair);
}

.page-about .about-stats .stat__value {
  display: flex;
  align-items: baseline;
  gap: 4px;
  font-family: var(--font-mono);
  font-size: clamp(28px, 4.4vw, 44px);
  font-weight: 600;
  line-height: 1;
  letter-spacing: -.01em;
  color: var(--porcelain);
}

.page-about .about-stats__unit {
  font-size: 13px;
  font-weight: 400;
  letter-spacing: .06em;
  color: var(--cyan-400);
}

.page-about .about-stats .stat__label {
  font-size: 12px;
  letter-spacing: .1em;
  color: var(--silver);
  opacity: .78;
}

/* ---------- 档案夹式分栏 ---------- */
.page-about .about-file {
  padding-block: var(--space-section);
  border-top: 1px solid var(--about-hair);
}

.page-about .about-map {
  border-top-color: rgba(33, 230, 193, .18);
}

.page-about .about-file__inner {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 22px;
}

.page-about .about-file__rail {
  display: flex;
  align-items: center;
  gap: 14px;
}

.page-about .about-file__rail .index-num {
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: .18em;
  color: var(--cyan-400);
}

.page-about .about-file__rail-line {
  display: block;
  flex: 1;
  height: 1px;
  background: linear-gradient(90deg, var(--line-blue), transparent);
}

.page-about .about-file__body .section-head {
  margin: 0;
}

.page-about .about-file__body .section-title {
  margin: 0;
  max-width: 24em;
  font-size: clamp(23px, 2.9vw, 34px);
  font-weight: 400;
  line-height: 1.35;
  color: var(--porcelain);
}

.page-about .about-lead {
  margin: 18px 0 0;
  max-width: 38em;
  font-size: 15px;
  line-height: 1.9;
  color: var(--silver);
}

/* ---------- 01 历程刻度带 ---------- */
.page-about .about-roadmap {
  list-style: none;
  margin: 44px 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 22px;
}

.page-about .about-roadmap__item {
  position: relative;
  z-index: 1;
  padding: 26px 22px 26px;
  border-radius: var(--radius-card);
  border: 1px solid var(--about-hair);
  background: var(--about-fade);
  transition: border-color .16s var(--ease), transform .16s var(--ease);
}

.page-about .about-roadmap__item:hover {
  border-color: var(--cyan-400);
  transform: translateY(-2px);
}

.page-about .about-roadmap__node {
  display: block;
  width: 10px;
  height: 10px;
  margin-bottom: 20px;
  border-radius: 50%;
  background: var(--cyan-400);
  box-shadow: 0 0 0 5px rgba(33, 230, 193, .12);
}

.page-about .about-roadmap__stage {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .16em;
  color: var(--cyan-100);
  opacity: .85;
}

.page-about .about-roadmap__title {
  margin: 10px 0 0;
  font-size: 18px;
  font-weight: 500;
  line-height: 1.5;
  color: var(--porcelain);
}

.page-about .about-roadmap__text {
  margin: 12px 0 0;
  font-size: 15px;
  line-height: 1.85;
  color: var(--silver);
}

/* ---------- 02 数据流程 ---------- */
.page-about .about-flow {
  margin-top: 40px;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 34px;
}

.page-about .about-flow__list {
  list-style: none;
  margin: 0;
  padding: 0;
}

.page-about .about-flow__item {
  position: relative;
  padding: 0 0 30px 44px;
}

.page-about .about-flow__item:last-child {
  padding-bottom: 0;
}

.page-about .about-flow__item::before {
  content: "";
  position: absolute;
  left: 0;
  top: 6px;
  width: 9px;
  height: 9px;
  border-radius: 50%;
  border: 1px solid var(--cyan-400);
  background: var(--deep-900);
}

.page-about .about-flow__item::after {
  content: "";
  position: absolute;
  left: 4px;
  top: 24px;
  bottom: 0;
  width: 1px;
  background: var(--line-blue);
}

.page-about .about-flow__item:last-child::after {
  display: none;
}

.page-about .about-flow__label {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .16em;
  color: var(--cyan-400);
}

.page-about .about-flow__title {
  margin: 8px 0 0;
  font-size: 18px;
  font-weight: 500;
  color: var(--porcelain);
}

.page-about .about-flow__text {
  margin: 10px 0 0;
  max-width: 36em;
  font-size: 15px;
  line-height: 1.85;
  color: var(--silver);
}

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

.page-about .about-flow__figure .media {
  border-radius: var(--radius-lg);
  overflow: hidden;
  border: 1px solid var(--about-hair);
}

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

.page-about .media__caption {
  font-size: 12px;
  line-height: 1.7;
  letter-spacing: .04em;
  color: var(--silver);
  opacity: .8;
}

/* ---------- 03 服务版图 ---------- */
.page-about .about-map__figure {
  margin: 34px 0 0;
}

.page-about .about-map__figure .media {
  border-radius: var(--radius-lg);
  overflow: hidden;
  border: 1px solid var(--about-hair);
}

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

.page-about .about-caption {
  display: block;
  margin-top: 12px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .12em;
  color: var(--cyan-100);
  opacity: .75;
}

.page-about .about-map__grid {
  margin-top: 36px;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 28px;
}

.page-about .about-map__col-title {
  margin: 0 0 12px;
  font-size: 17px;
  font-weight: 500;
  color: var(--porcelain);
}

.page-about .about-map__col p {
  margin: 0;
  font-size: 15px;
  line-height: 1.9;
  color: var(--silver);
}

.page-about .about-map__col--contact {
  padding: 24px 22px;
  border-radius: var(--radius-card);
  border: 1px solid var(--about-hair);
  background: var(--about-fade);
}

.page-about .about-map__col--contact .btn {
  margin-top: 18px;
}

/* ---------- 04 团队与资质 ---------- */
.page-about .about-team {
  margin-top: 40px;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 18px;
}

.page-about .about-team__card {
  padding: 26px 22px 28px;
  border-radius: var(--radius-card);
  border: 1px solid var(--about-hair);
  background: radial-gradient(120% 110% at 0% 0%, rgba(29, 63, 102, .5), rgba(7, 20, 38, .2));
  transition: border-color .16s var(--ease), transform .16s var(--ease);
}

.page-about .about-team__card:hover {
  border-color: var(--cyan-400);
  transform: translateY(-2px);
}

.page-about .about-team__num {
  display: flex;
  align-items: baseline;
  gap: 6px;
  margin: 0;
  font-family: var(--font-mono);
  font-size: clamp(34px, 5vw, 50px);
  font-weight: 600;
  line-height: 1;
  color: var(--porcelain);
}

.page-about .about-team__unit {
  font-size: 13px;
  font-weight: 400;
  letter-spacing: .1em;
  color: var(--cyan-400);
}

.page-about .about-team__role {
  margin: 16px 0 0;
  font-size: 16px;
  font-weight: 500;
  letter-spacing: .04em;
  color: var(--cyan-100);
}

.page-about .about-team__text {
  margin: 10px 0 0;
  font-size: 14px;
  line-height: 1.85;
  color: var(--silver);
}

.page-about .about-cred {
  margin-top: 36px;
  padding-top: 26px;
  border-top: 1px solid var(--about-hair);
}

.page-about .about-cred__label {
  margin: 0 0 16px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .18em;
  color: var(--cyan-400);
}

/* ---------- 05 合作生态 ---------- */
.page-about .about-filter {
  margin-top: 30px;
}

.page-about .about-filter .tag {
  cursor: pointer;
  font-family: inherit;
  background: transparent;
  color: var(--silver);
}

.page-about .about-eco {
  margin-top: 30px;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 34px;
}

.page-about .about-partners {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 16px;
}

.page-about .about-partner {
  padding: 22px 20px 24px;
  border-radius: var(--radius-card);
  border: 1px solid var(--about-hair);
  background: linear-gradient(150deg, rgba(14, 39, 69, .7), rgba(7, 20, 38, .25));
  transition: border-color .16s var(--ease), transform .16s var(--ease);
}

.page-about .about-partner:hover {
  border-color: var(--cyan-400);
  transform: translateY(-2px);
}

.page-about .about-partner__type {
  display: inline-block;
  margin: 0 0 14px;
  padding: 5px 12px;
  border-radius: var(--radius-pill);
  border: 1px solid var(--outline-silver);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .14em;
  color: var(--cyan-100);
}

.page-about .about-partner__title {
  margin: 0;
  font-size: 16px;
  font-weight: 500;
  line-height: 1.55;
  color: var(--porcelain);
}

.page-about .about-partner__text {
  margin: 10px 0 0;
  font-size: 14px;
  line-height: 1.85;
  color: var(--silver);
}

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

.page-about .about-eco__figure .media {
  border-radius: var(--radius-lg);
  overflow: hidden;
  border: 1px solid var(--about-hair);
}

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

/* ---------- 06 服务标准 ---------- */
.page-about .about-standards {
  list-style: none;
  margin: 40px 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1px;
  border-top: 1px solid var(--about-hair);
}

.page-about .about-standards__item {
  padding: 26px 0 28px;
  border-bottom: 1px solid var(--about-hair);
}

.page-about .about-standards__idx {
  display: block;
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: .18em;
  color: var(--cyan-400);
}

.page-about .about-standards__title {
  margin: 12px 0 0;
  font-size: 19px;
  font-weight: 500;
  color: var(--porcelain);
}

.page-about .about-standards__text {
  margin: 10px 0 0;
  max-width: 36em;
  font-size: 15px;
  line-height: 1.9;
  color: var(--silver);
}

/* ---------- 入口区 ---------- */
.page-about .about-next {
  padding-block: var(--space-section);
  border-top: 1px solid var(--about-hair);
}

.page-about .about-next__title {
  margin: 0;
  font-size: clamp(22px, 2.8vw, 30px);
  font-weight: 400;
  color: var(--porcelain);
}

.page-about .about-next__links {
  list-style: none;
  margin: 30px 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 0;
}

.page-about .about-next__links li {
  border-bottom: 1px solid var(--about-hair);
}

.page-about .about-next__links li:first-child {
  border-top: 1px solid var(--about-hair);
}

.page-about .about-link {
  display: block;
  padding: 20px 30px 20px 0;
  position: relative;
  font-size: 15px;
  line-height: 1.6;
  color: var(--silver);
  text-decoration: none;
  transition: color .18s var(--ease);
}

.page-about .about-link::after {
  content: "→";
  position: absolute;
  right: 4px;
  top: 50%;
  transform: translateY(-50%);
  font-family: var(--font-mono);
  font-size: 14px;
  color: var(--line-blue);
  transition: color .18s var(--ease), right .18s var(--ease);
}

.page-about .about-link:hover,
.page-about .about-link:focus-visible {
  color: var(--cyan-100);
}

.page-about .about-link:hover::after,
.page-about .about-link:focus-visible::after {
  color: var(--cyan-400);
  right: 0;
}

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

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

@media (min-width: 900px) {
  .page-about .about-file__inner {
    grid-template-columns: var(--about-rail) minmax(0, 1fr);
    gap: 48px;
    align-items: start;
  }

  .page-about .about-file__rail {
    flex-direction: column;
    align-items: flex-start;
    gap: 16px;
    position: sticky;
    top: 96px;
  }

  .page-about .about-file__rail-line {
    flex: none;
    width: 1px;
    height: 68px;
    background: linear-gradient(180deg, var(--line-blue), transparent);
  }

  .page-about .about-roadmap {
    position: relative;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 26px;
    align-items: start;
  }

  .page-about .about-roadmap::before {
    content: "";
    position: absolute;
    z-index: 0;
    top: 6px;
    left: 2%;
    width: 94%;
    height: 1px;
    background: linear-gradient(90deg, transparent, var(--line-blue) 10%, rgba(33, 230, 193, .55) 50%, var(--line-blue) 90%, transparent);
    transform: rotate(5deg);
    transform-origin: left center;
    pointer-events: none;
  }

  .page-about .about-roadmap__item:nth-child(2) {
    margin-top: 44px;
  }

  .page-about .about-roadmap__item:nth-child(3) {
    margin-top: 88px;
  }

  .page-about .about-flow {
    grid-template-columns: minmax(0, 7fr) minmax(0, 4fr);
    gap: 48px;
    align-items: start;
  }

  .page-about .about-map__grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 4fr);
    gap: 32px 40px;
    align-items: start;
  }

  .page-about .about-map__col--contact {
    grid-column: 2 / 3;
    grid-row: 1 / span 2;
  }

  .page-about .about-team {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 20px;
  }

  .page-about .about-eco {
    grid-template-columns: minmax(0, 1fr) minmax(0, 340px);
    gap: 44px;
    align-items: start;
  }

  .page-about .about-standards {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 0 36px;
    border-top: 0;
  }

  .page-about .about-standards__item {
    padding: 0 0 8px;
    border-bottom: 0;
  }

  .page-about .about-standards__item .about-standards__idx {
    padding-top: 22px;
    border-top: 1px solid var(--cyan-400);
  }
}

@media (min-width: 1100px) {
  .page-about .about-partners {
    gap: 18px;
  }

  .page-about .about-hero {
    padding-top: 52px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-roadmap__item,
  .page-about .about-team__card,
  .page-about .about-partner,
  .page-about .about-link,
  .page-about .about-link::after {
    transition: none;
  }

  .page-about .about-roadmap__item:hover,
  .page-about .about-team__card:hover,
  .page-about .about-partner:hover {
    transform: none;
  }
}