.page-about {
  --about-line: rgba(30, 127, 168, .26);
  --about-panel: rgba(223, 231, 236, .52);
}

.page-about .about-crumb {
  padding-top: clamp(1.1rem, 3.5vw, 1.9rem);
}

/* ---------- 首屏拼贴 ---------- */
.page-about .about-hero {
  position: relative;
  overflow: hidden;
  margin-top: clamp(.9rem, 2vw, 1.4rem);
  padding-block: clamp(2.4rem, 6.5vw, 5rem) clamp(2.6rem, 7vw, 5.5rem);
  background: linear-gradient(158deg, var(--ink-900) 0%, var(--ink-700) 56%, var(--lake-dark) 100%);
  color: var(--salt);
  border-radius: var(--radius-l) var(--radius-l) 0 0;
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image: repeating-linear-gradient(114deg, rgba(156, 207, 227, .09) 0 1px, transparent 1px 44px);
  pointer-events: none;
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  right: -14%;
  bottom: -32%;
  width: min(46rem, 78vw);
  aspect-ratio: 1;
  border-radius: 50%;
  background: radial-gradient(circle at 42% 42%, rgba(30, 127, 168, .38), transparent 68%);
  pointer-events: none;
}

.page-about .about-hero-grid {
  position: relative;
  z-index: 1;
  display: grid;
  gap: clamp(2rem, 5vw, 3.5rem);
}

.page-about .about-hero-lead h1 {
  margin: .9rem 0 1.1rem;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(2rem, 6.4vw, 4.15rem);
  line-height: 1.06;
  letter-spacing: -.02em;
}

.page-about .about-hero-lede {
  max-width: 34rem;
  margin: 0;
  font-size: clamp(1rem, 1.5vw, 1.0625rem);
  line-height: 1.78;
  color: rgba(248, 250, 251, .85);
}

.page-about .about-hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: .75rem;
  margin-top: 1.7rem;
}

.page-about .about-hero-stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: .8rem;
}

.page-about .about-stat {
  display: flex;
  flex-direction: column;
  gap: .4rem;
  padding: 1.05rem 1rem 1.15rem;
  border: 1px solid rgba(156, 207, 227, .26);
  border-radius: var(--radius-m);
  background: rgba(248, 250, 251, .08);
  backdrop-filter: blur(10px);
}

.page-about .about-stat--a,
.page-about .about-stat--d {
  grid-column: span 2;
}

.page-about .about-stat--b {
  border-color: rgba(242, 169, 59, .42);
}

.page-about .about-stat-num {
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: clamp(1.85rem, 5vw, 2.65rem);
  line-height: 1;
  letter-spacing: -.02em;
  color: var(--amber);
}

.page-about .about-stat-label {
  font-size: .875rem;
  line-height: 1.55;
  color: rgba(248, 250, 251, .78);
}

/* ---------- 时间轴 ---------- */
.page-about .about-timeline-grid {
  margin-top: clamp(1.9rem, 4.5vw, 3.1rem);
}

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

.page-about .about-stop {
  display: grid;
  grid-template-columns: 1fr;
  gap: .35rem;
}

.page-about .about-stop-year {
  display: flex;
  align-items: baseline;
  gap: .45rem;
  font-family: var(--font-mono);
}

.page-about .about-stop-year .num-display {
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: clamp(1.45rem, 4.6vw, 2.05rem);
  line-height: 1;
  letter-spacing: -.02em;
  color: var(--ink-700);
}

.page-about .about-stop-span {
  font-size: .78rem;
  letter-spacing: .08em;
  text-transform: uppercase;
  color: var(--lake);
}

.page-about .about-stop-body {
  position: relative;
  padding-left: 1.15rem;
  padding-bottom: 1.6rem;
  border-left: 2px solid var(--about-line);
}

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

.page-about .about-stop-body::before {
  content: "";
  position: absolute;
  left: -8px;
  top: .5rem;
  width: 14px;
  height: 14px;
  border-radius: 50%;
  background: var(--flag);
  box-shadow: 0 0 0 4px rgba(232, 99, 26, .16);
}

.page-about .about-rail .fold-head {
  display: flex;
  align-items: flex-start;
  gap: .7rem;
  width: 100%;
  padding: .8rem .9rem;
  border: 1px solid var(--mist);
  border-radius: var(--radius-m);
  background: #fff;
  font: inherit;
  color: inherit;
  text-align: left;
  cursor: pointer;
  transition: border-color .25s var(--ease), box-shadow .25s var(--ease), background .25s var(--ease);
}

.page-about .about-rail .fold-head:hover,
.page-about .about-rail .fold-head:focus-visible {
  border-color: var(--lake-300);
  box-shadow: var(--shadow-card);
}

.page-about .fold-index {
  flex: 0 0 auto;
  padding-top: .2rem;
  font-family: var(--font-mono);
  font-size: .72rem;
  letter-spacing: .1em;
  text-transform: uppercase;
  color: var(--flag);
}

.page-about .fold-title {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.02rem;
  line-height: 1.45;
  color: var(--ink-700);
}

.page-about .fold-mark {
  position: relative;
  flex: 0 0 auto;
  width: 1.05rem;
  height: 1.05rem;
  margin-left: auto;
  margin-top: .3rem;
}

.page-about .fold-mark::before,
.page-about .fold-mark::after {
  content: "";
  position: absolute;
  background: var(--lake);
  border-radius: 2px;
}

.page-about .fold-mark::before {
  left: 0;
  right: 0;
  top: 50%;
  height: 2px;
  transform: translateY(-50%);
}

.page-about .fold-mark::after {
  top: 0;
  bottom: 0;
  left: 50%;
  width: 2px;
  transform: translateX(-50%);
  transition: transform .25s var(--ease), opacity .25s var(--ease);
}

.page-about .fold-head[aria-expanded="true"] .fold-mark::after {
  transform: translateX(-50%) scaleY(0);
  opacity: 0;
}

.page-about .fold-body {
  padding: 0 .9rem;
}

.page-about .fold-inner {
  padding: .85rem 0 .35rem;
  font-size: .95rem;
  line-height: 1.78;
  color: var(--text);
}

.page-about .fold-inner p {
  margin: 0;
  max-width: 34rem;
}

.page-about .about-rail-media {
  margin-top: 1.6rem;
}

.page-about .about-rail-media .media-frame {
  border-radius: var(--radius-l);
  overflow: hidden;
}

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

/* ---------- 四项业务 ---------- */
.page-about .about-services {
  background: linear-gradient(180deg, rgba(156, 207, 227, .26) 0%, rgba(248, 250, 251, 0) 76%);
}

.page-about .about-service-grid {
  margin-top: clamp(1.9rem, 4.5vw, 2.9rem);
  row-gap: clamp(1rem, 2.4vw, 1.5rem);
}

.page-about .about-service {
  position: relative;
  display: flex;
  flex-direction: column;
  gap: .62rem;
  overflow: hidden;
  padding: clamp(1.2rem, 2.6vw, 1.85rem) clamp(1.1rem, 2.4vw, 1.7rem) clamp(1.1rem, 2.2vw, 1.5rem);
  border: 1px solid var(--mist);
  border-radius: var(--radius-m);
  background: #fff;
  box-shadow: var(--shadow-card);
}

.page-about .about-service::after {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 4px;
  background: linear-gradient(180deg, var(--lake), var(--lake-300));
}

.page-about .about-service:nth-child(2n)::after {
  background: linear-gradient(180deg, var(--flag), var(--amber));
}

.page-about .about-service-index {
  font-family: var(--font-mono);
  font-size: 1.5rem;
  line-height: 1;
  letter-spacing: -.02em;
  color: rgba(30, 127, 168, .4);
}

.page-about .about-service:nth-child(2n) .about-service-index {
  color: rgba(232, 99, 26, .45);
}

.page-about .about-service-title {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(1.15rem, 2.2vw, 1.4rem);
  line-height: 1.3;
  color: var(--ink-700);
}

.page-about .about-service-text {
  margin: 0;
  font-size: .97rem;
  line-height: 1.78;
  color: var(--text);
}

.page-about .about-service-fit {
  margin: auto 0 0;
  padding-top: .75rem;
  border-top: 1px dashed var(--mist);
  font-size: .84rem;
  line-height: 1.6;
  color: var(--lake-dark);
}

/* ---------- 价值观 ---------- */
.page-about .about-values {
  background: linear-gradient(180deg, var(--ink-900) 0%, var(--ink-700) 100%);
  color: var(--salt);
}

.page-about .about-values .section-title {
  color: var(--salt);
}

.page-about .about-values .section-lede {
  color: rgba(248, 250, 251, .78);
}

.page-about .about-value-list {
  list-style: none;
  margin: clamp(1.6rem, 4vw, 2.6rem) 0 0;
  padding: 0;
}

.page-about .about-value {
  display: grid;
  grid-template-columns: 1fr;
  gap: .45rem;
  padding: clamp(1.1rem, 2.6vw, 1.7rem) 0;
  border-top: 1px solid rgba(156, 207, 227, .24);
}

.page-about .about-value:last-child {
  border-bottom: 1px solid rgba(156, 207, 227, .24);
}

.page-about .about-value-index {
  font-family: var(--font-mono);
  font-size: 1.4rem;
  line-height: 1;
  letter-spacing: .02em;
  color: var(--flag);
}

.page-about .about-value-title {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(1.08rem, 2.1vw, 1.32rem);
  line-height: 1.35;
  color: var(--salt);
}

.page-about .about-value-text {
  margin: 0;
  font-size: .96rem;
  line-height: 1.78;
  color: rgba(248, 250, 251, .8);
}

/* ---------- 团队 ---------- */
.page-about .about-team-grid {
  display: grid;
  gap: clamp(1.8rem, 4.5vw, 3rem);
}

.page-about .about-team-lede {
  max-width: 34rem;
  margin: .9rem 0 1.5rem;
  font-size: 1rem;
  line-height: 1.8;
  color: var(--text);
}

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

.page-about .about-facts li {
  display: grid;
  grid-template-columns: 4.6rem minmax(0, 1fr);
  gap: .5rem .9rem;
  padding: .82rem 0;
  border-top: 1px solid var(--mist);
  font-size: .92rem;
  line-height: 1.7;
  color: var(--text);
}

.page-about .about-facts li:last-child {
  border-bottom: 1px solid var(--mist);
}

.page-about .about-facts strong {
  font-family: var(--font-mono);
  font-size: 1.02rem;
  font-weight: 700;
  letter-spacing: -.01em;
  color: var(--lake-dark);
}

.page-about .about-team-media {
  border-radius: var(--radius-l);
  overflow: hidden;
}

/* ---------- 覆盖网络 ---------- */
.page-about .about-network {
  background: linear-gradient(180deg, var(--about-panel) 0%, rgba(248, 250, 251, 0) 82%);
}

.page-about .about-network-figure {
  margin-top: clamp(1.7rem, 4vw, 2.6rem);
  border-radius: var(--radius-l);
  overflow: hidden;
}

.page-about .about-network-grid {
  display: grid;
  gap: clamp(1.4rem, 3.5vw, 2.4rem);
  margin-top: clamp(1.4rem, 3.5vw, 2.2rem);
}

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

.page-about .about-centers li {
  display: grid;
  grid-template-columns: .9rem 5rem minmax(0, 1fr);
  align-items: center;
  gap: .7rem;
  padding: .78rem 0;
  border-top: 1px solid rgba(30, 127, 168, .18);
  font-size: .92rem;
  line-height: 1.6;
  color: var(--text);
  transition: background .25s var(--ease);
}

.page-about .about-centers li:last-child {
  border-bottom: 1px solid rgba(30, 127, 168, .18);
}

.page-about .about-centers li:hover {
  background: rgba(156, 207, 227, .2);
}

.page-about .about-center-dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--flag);
  box-shadow: 0 0 0 3px rgba(232, 99, 26, .16);
}

.page-about .about-centers strong {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1rem;
  color: var(--ink-700);
}

.page-about .about-eco .fold-head {
  display: flex;
  align-items: flex-start;
  gap: .7rem;
  width: 100%;
  padding: .9rem 1rem;
  border: 1px solid var(--lake-300);
  border-radius: var(--radius-m);
  background: rgba(248, 250, 251, .82);
  font: inherit;
  color: inherit;
  text-align: left;
  cursor: pointer;
  transition: border-color .25s var(--ease), background .25s var(--ease);
}

.page-about .about-eco .fold-head:hover,
.page-about .about-eco .fold-head:focus-visible {
  border-color: var(--lake);
  background: #fff;
}

.page-about .about-eco .fold-body {
  padding: 0 1rem;
}

/* ---------- 长期客户 ---------- */
.page-about .about-client-stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: .9rem;
  margin-top: clamp(1.7rem, 4vw, 2.6rem);
}

.page-about .about-client-stat {
  display: flex;
  flex-direction: column;
  gap: .45rem;
  padding: 1.15rem 1rem;
  border: 1px solid var(--mist);
  border-left: 4px solid var(--flag);
  border-radius: var(--radius-s) var(--radius-m) var(--radius-m) var(--radius-s);
  background: #fff;
}

.page-about .about-client-stat .num-display {
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: clamp(1.5rem, 4.4vw, 2.1rem);
  line-height: 1;
  letter-spacing: -.02em;
  color: var(--ink-700);
}

.page-about .about-client-stat .num-display--flag {
  color: var(--amber-ink);
}

.page-about .about-client-label {
  font-size: .875rem;
  line-height: 1.6;
  color: var(--text);
}

.page-about .about-mix-block {
  margin-top: clamp(2rem, 5vw, 3.2rem);
  padding-top: clamp(1.4rem, 3vw, 2rem);
  border-top: 1px solid var(--mist);
}

.page-about .about-mix-title {
  margin: 0 0 1.1rem;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(1.05rem, 2.1vw, 1.28rem);
  line-height: 1.35;
  color: var(--ink-700);
}

.page-about .about-mix {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: .45rem;
  margin: 0 0 1.3rem;
  padding: 0;
}

.page-about .about-mix-item {
  flex: 1 1 auto;
  min-width: 5.5rem;
  display: flex;
  flex-direction: column;
  gap: .3rem;
  padding: .8rem .75rem .85rem;
  border-radius: var(--radius-s);
  background: var(--mist);
  border-bottom: 4px solid transparent;
}

.page-about .about-mix-item--a {
  flex-grow: 4;
  background: rgba(30, 127, 168, .16);
  border-bottom-color: var(--lake);
}

.page-about .about-mix-item--b {
  flex-grow: 3;
  background: rgba(30, 127, 168, .11);
  border-bottom-color: var(--lake-300);
}

.page-about .about-mix-item--c {
  flex-grow: 2;
  background: rgba(242, 169, 59, .18);
  border-bottom-color: var(--amber);
}

.page-about .about-mix-item--d {
  flex-grow: 1;
  background: rgba(232, 99, 26, .12);
  border-bottom-color: var(--flag);
}

.page-about .about-mix-item--e {
  flex-grow: 1;
}

.page-about .about-mix-name {
  font-size: .84rem;
  color: var(--text);
}

.page-about .about-mix-share {
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: 1.1rem;
  letter-spacing: -.01em;
  color: var(--ink-700);
}

.page-about .about-mix-note {
  max-width: 42rem;
  margin: 0;
  font-size: .96rem;
  line-height: 1.8;
  color: var(--text);
}

/* ---------- 收尾 ---------- */
.page-about .about-share {
  background: linear-gradient(152deg, var(--lake) 0%, var(--lake-dark) 62%, var(--ink-700) 100%);
  color: var(--salt);
  border-radius: var(--radius-l) var(--radius-l) 0 0;
}

.page-about .about-share .section-title {
  color: var(--salt);
}

.page-about .about-share-grid {
  display: grid;
  gap: clamp(1.8rem, 4.5vw, 3rem);
}

.page-about .about-share-text {
  max-width: 34rem;
  margin: 1rem 0 1.6rem;
  font-size: 1rem;
  line-height: 1.8;
  color: rgba(248, 250, 251, .86);
}

.page-about .about-share-links {
  list-style: none;
  margin: 0;
  padding: 0;
  align-self: center;
}

.page-about .about-share-links li + li {
  border-top: 1px solid rgba(248, 250, 251, .22);
}

.page-about .about-share-links a {
  display: flex;
  flex-direction: column;
  gap: .2rem;
  padding: 1rem .25rem;
  color: inherit;
  text-decoration: none;
  transition: padding-left .25s var(--ease), background .25s var(--ease);
}

.page-about .about-share-links a:hover,
.page-about .about-share-links a:focus-visible {
  padding-left: .85rem;
  background: rgba(248, 250, 251, .1);
}

.page-about .about-share-label {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.05rem;
}

.page-about .about-share-desc {
  font-size: .82rem;
  line-height: 1.6;
  color: rgba(248, 250, 251, .74);
}

/* ---------- 响应式 ---------- */
@media (min-width: 720px) {
  .page-about .about-stop {
    grid-template-columns: 7.4rem minmax(0, 1fr);
    gap: 0 1.5rem;
  }

  .page-about .about-stop-year {
    flex-direction: column;
    align-items: flex-start;
    gap: .2rem;
  }

  .page-about .about-stop-body {
    padding-left: 1.6rem;
    padding-bottom: 2.1rem;
  }

  .page-about .about-stat--a,
  .page-about .about-stat--d {
    padding-block: 1.4rem;
  }

  .page-about .about-value {
    grid-template-columns: 3.4rem minmax(0, 1.05fr) minmax(0, 1.2fr);
    align-items: start;
    gap: 0 1.5rem;
  }

  .page-about .about-value-index {
    padding-top: .15rem;
  }

  .page-about .about-facts li {
    grid-template-columns: 5.4rem minmax(0, 1fr);
  }
}

@media (min-width: 960px) {
  .page-about .about-hero-grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    align-items: end;
  }

  .page-about .about-hero-actions {
    margin-top: 2.1rem;
  }

  .page-about .about-rail-media {
    margin-top: 0;
    align-self: start;
    position: sticky;
    top: 6.5rem;
  }

  .page-about .about-team-grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    align-items: center;
  }

  .page-about .about-network-grid {
    grid-template-columns: minmax(0, 5fr) minmax(0, 7fr);
    align-items: start;
  }

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

  .page-about .about-share-grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    align-items: center;
  }
}

@media (max-width: 719px) {
  .page-about .about-client-stats {
    grid-template-columns: 1fr;
  }

  .page-about .about-mix-item {
    min-width: 4.6rem;
    padding: .65rem .55rem .7rem;
  }

  .page-about .about-mix-share {
    font-size: .98rem;
  }

  .page-about .about-centers li {
    grid-template-columns: .9rem 4.2rem minmax(0, 1fr);
    gap: .55rem;
    font-size: .875rem;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .fold-mark::after,
  .page-about .fold-head,
  .page-about .about-share-links a,
  .page-about .about-centers li {
    transition: none;
  }
}