.page-about {
  --about-paper-accent: #0E6E86;
  --about-hair: rgba(143, 182, 201, 0.22);
  --about-gap: clamp(28px, 4.5vw, 64px);
  --about-node: 21px;
  --about-node-offset: 59px;
}

/* ---------- 面包屑 ---------- */
.page-about .about-crumbs {
  padding-bottom: 6px;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  padding-top: clamp(20px, 4vw, 56px);
}

.page-about .about-hero__title {
  margin: 14px 0 0;
  font-size: clamp(38px, 7.4vw, 94px);
  font-weight: 900;
  line-height: 1.02;
  letter-spacing: -0.025em;
  color: var(--tx-white);
  max-width: 14ch;
}

.page-about .about-hero__accent {
  display: block;
  margin-top: 8px;
  color: var(--tx-cyan);
  font-size: clamp(22px, 3.6vw, 46px);
  line-height: 1.15;
  letter-spacing: 0;
  padding-left: 18px;
  border-left: 6px solid var(--tx-lava);
}

.page-about .about-hero__lead {
  max-width: var(--tx-read);
  margin-top: clamp(20px, 3vw, 32px);
  color: var(--tx-mist);
}

.page-about .about-hero__facts {
  list-style: none;
  margin: clamp(28px, 4vw, 52px) 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 3px;
  background: var(--tx-panel);
  border: var(--tx-line) solid var(--tx-panel);
}

.page-about .about-hero__fact {
  background: var(--tx-deep-2);
  padding: 18px 16px 20px;
  display: flex;
  flex-direction: column;
  gap: 6px;
  min-width: 0;
}

.page-about .about-hero__factNum {
  font-size: clamp(28px, 5.4vw, 52px);
  line-height: 1;
  font-weight: 700;
}

.page-about .about-hero__factNum--cyan { color: var(--tx-cyan); }
.page-about .about-hero__factNum--lime { color: var(--tx-lime); }
.page-about .about-hero__factNum--lava { color: var(--tx-lava); }

.page-about .about-hero__factLabel {
  font-size: 14px;
  line-height: 1.5;
  color: var(--tx-mist);
}

@media (min-width: 760px) {
  .page-about .about-hero__facts {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

/* ---------- 我们做什么 ---------- */
.page-about .about-scope {
  display: grid;
  gap: var(--about-gap);
}

.page-about .about-scope__head {
  display: grid;
  gap: 10px;
  align-content: start;
}

.page-about .about-scope__title {
  margin: 0;
  font-size: clamp(28px, 4.4vw, 56px);
  line-height: 1.08;
  color: var(--tx-white);
  max-width: 18ch;
}

.page-about .about-scope__body {
  display: grid;
  gap: clamp(20px, 3vw, 32px);
}

.page-about .about-scope__intro {
  color: var(--tx-mist);
}

.page-about .about-scope__intro a {
  color: var(--tx-cyan);
  text-decoration: none;
  border-bottom: 2px solid rgba(23, 224, 255, 0.45);
}

.page-about .about-scope__intro a:hover,
.page-about .about-scope__intro a:focus-visible {
  border-bottom-color: var(--tx-lava);
  color: var(--tx-lava);
}

.page-about .about-scope__list {
  list-style: none;
  margin: 0;
  padding: 0;
  border-top: var(--tx-line) solid var(--tx-panel);
}

.page-about .about-scope__item {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 6px 18px;
  padding: 22px 0 24px;
  border-bottom: var(--tx-line) solid var(--tx-panel);
}

.page-about .about-scope__idx {
  grid-row: span 2;
  font-size: clamp(20px, 2.4vw, 26px);
  line-height: 1.2;
  color: var(--tx-cyan);
  opacity: 0.9;
}

.page-about .about-scope__itemTitle {
  margin: 0;
  font-size: clamp(18px, 1.6vw, 21px);
  line-height: 1.4;
  color: var(--tx-white);
}

.page-about .about-scope__item p {
  margin: 0;
  max-width: 64ch;
  color: var(--tx-mist);
  font-size: 16px;
  line-height: 1.8;
}

.page-about .about-audience {
  display: grid;
  gap: 12px;
}

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

@media (min-width: 960px) {
  .page-about .about-scope {
    grid-template-columns: minmax(0, 0.85fr) minmax(0, 1.15fr);
    align-items: start;
  }
  .page-about .about-scope__head {
    position: sticky;
    top: 96px;
  }
}

/* ---------- 发展历程 ---------- */
.page-about .about-path__head {
  display: grid;
  gap: 10px;
  margin-bottom: clamp(28px, 4vw, 48px);
}

.page-about .about-path__title {
  margin: 0;
  font-size: clamp(28px, 4.6vw, 58px);
  line-height: 1.06;
  color: var(--tx-white);
  max-width: 20ch;
}

.page-about .about-path__intro {
  color: var(--tx-mist);
  margin: 0;
}

.page-about .about-tl {
  position: relative;
  padding: clamp(18px, 3vw, 40px) 0;
  border-top: var(--tx-line) solid var(--tx-panel);
  border-bottom: var(--tx-line) solid var(--tx-panel);
}

.page-about .about-tl__wash {
  position: absolute;
  inset: 0;
  z-index: 0;
  pointer-events: none;
}

.page-about .about-tl__wash img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
  opacity: 0.22;
}

.page-about .about-tl__wash::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, var(--tx-deep) 0%, rgba(6, 26, 46, 0.55) 45%, var(--tx-deep) 100%);
}

.page-about .about-tl__list {
  position: relative;
  z-index: 1;
  list-style: none;
  margin: 0;
  padding: 0;
}

.page-about .about-tl__list::before {
  content: "";
  position: absolute;
  top: 0;
  bottom: 0;
  left: 9px;
  width: 3px;
  background: linear-gradient(180deg, transparent, var(--tx-cyan) 10%, var(--tx-cyan) 90%, transparent);
  opacity: 0.5;
}

.page-about .about-tl__item {
  position: relative;
  padding: 24px 0 26px 40px;
}

.page-about .about-tl__node {
  position: absolute;
  top: 32px;
  left: 0;
  width: var(--about-node);
  height: var(--about-node);
  background: var(--tx-deep);
  border: var(--tx-line) solid var(--tx-cyan);
  box-shadow: var(--tx-shadow-soft);
}

.page-about .about-tl__item:nth-child(3n) .about-tl__node {
  border-color: var(--tx-lava);
}

.page-about .about-tl__year {
  display: block;
  margin: 0 0 10px;
  font-size: clamp(30px, 6vw, 52px);
  line-height: 1;
  font-weight: 700;
  color: var(--tx-cyan);
}

.page-about .about-tl__item:nth-child(3n) .about-tl__year {
  color: var(--tx-lava);
}

.page-about .about-tl__title {
  margin: 0 0 10px;
  font-size: clamp(19px, 1.9vw, 23px);
  line-height: 1.35;
  color: var(--tx-white);
}

.page-about .about-tl__text {
  margin: 0;
  max-width: 58ch;
  color: var(--tx-mist);
  font-size: 16px;
  line-height: 1.8;
}

@media (min-width: 900px) {
  .page-about .about-tl {
    padding: clamp(32px, 4vw, 64px) 0;
  }

  .page-about .about-tl__list::before {
    left: 50%;
    transform: translateX(-50%);
  }

  .page-about .about-tl__item {
    width: calc(50% - 48px);
    padding: 34px 0 34px;
  }

  .page-about .about-tl__item:nth-child(odd) {
    margin-right: auto;
  }

  .page-about .about-tl__item:nth-child(even) {
    margin-left: auto;
  }

  .page-about .about-tl__node {
    top: 42px;
  }

  .page-about .about-tl__item:nth-child(odd) .about-tl__node {
    left: auto;
    right: calc(-1 * var(--about-node-offset));
  }

  .page-about .about-tl__item:nth-child(even) .about-tl__node {
    left: calc(-1 * var(--about-node-offset));
  }
}

/* ---------- 内容与数据团队 ---------- */
.page-about .about-team__panel {
  background: var(--tx-paper);
  color: var(--tx-ink);
  border: var(--tx-line) solid var(--tx-ink);
  box-shadow: var(--tx-shadow-hard);
  padding: clamp(22px, 4vw, 56px);
  display: grid;
  gap: clamp(24px, 4vw, 48px);
}

.page-about .about-team__eyebrow {
  color: var(--about-paper-accent);
}

.page-about .about-team__title {
  margin: 10px 0 16px;
  font-size: clamp(26px, 3.9vw, 48px);
  line-height: 1.1;
  color: var(--tx-ink);
  max-width: 16ch;
}

.page-about .about-team__lead {
  margin: 0;
  max-width: 52ch;
  font-size: 16px;
  line-height: 1.8;
  color: #33424C;
}

.page-about .about-team__roles {
  margin: 24px 0 0;
  display: grid;
  border-top: 2px solid rgba(16, 22, 28, 0.28);
}

.page-about .about-team__roles > div {
  display: grid;
  gap: 4px;
  padding: 12px 0;
  border-bottom: 2px solid rgba(16, 22, 28, 0.28);
}

.page-about .about-team__roles dt {
  font-weight: 800;
  font-size: 16px;
  color: var(--tx-ink);
}

.page-about .about-team__roles dd {
  margin: 0;
  font-size: 15px;
  line-height: 1.7;
  color: #3C4A54;
}

.page-about .about-team__stats {
  margin-top: 26px;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
  gap: 16px;
}

.page-about .about-team__stat {
  display: grid;
  gap: 2px;
  border-left: 6px solid var(--about-paper-accent);
  padding-left: 14px;
}

.page-about .about-team__statNum {
  font-size: clamp(28px, 4.2vw, 44px);
  line-height: 1;
  font-weight: 700;
  color: var(--about-paper-accent);
}

.page-about .about-team__statLabel {
  font-size: 14px;
  color: #46545E;
}

.page-about .about-team__figure {
  margin: 0;
  display: grid;
  gap: 10px;
}

.page-about .about-team__media {
  border: var(--tx-line) solid var(--tx-ink);
  background: var(--tx-deep);
}

.page-about .about-team__cap {
  font-size: 13px;
  line-height: 1.6;
  color: #46545E;
}

@media (min-width: 720px) {
  .page-about .about-team__roles > div {
    grid-template-columns: 132px minmax(0, 1fr);
    gap: 18px;
    align-items: baseline;
  }
}

@media (min-width: 900px) {
  .page-about .about-team__panel {
    grid-template-columns: minmax(0, 1fr) minmax(0, 0.85fr);
    align-items: center;
  }
}

/* ---------- 服务覆盖 ---------- */
.page-about .about-reach__head {
  display: grid;
  gap: 10px;
}

.page-about .about-reach__title {
  margin: 0;
  font-size: clamp(28px, 4.6vw, 56px);
  line-height: 1.08;
  color: var(--tx-white);
  max-width: 22ch;
}

.page-about .about-reach__grid {
  display: grid;
  gap: clamp(24px, 4vw, 56px);
  align-items: center;
  margin-top: clamp(24px, 4vw, 44px);
}

.page-about .about-map {
  width: 100%;
  height: auto;
  display: block;
  border: var(--tx-line) solid var(--tx-panel);
  background: radial-gradient(circle at 50% 42%, #0B2C4A 0%, #061A2E 72%);
}

.page-about .about-map__grid path {
  fill: none;
  stroke: var(--about-hair);
  stroke-width: 2;
  stroke-linejoin: round;
}

.page-about .about-map__dots circle {
  fill: var(--tx-deep);
  stroke: var(--tx-cyan);
  stroke-width: 3;
}

.page-about .about-map__dots circle:nth-child(2) {
  stroke: var(--tx-lime);
}

.page-about .about-map__dots circle:nth-child(3) {
  stroke: var(--tx-lava);
}

.page-about .about-reach__cities {
  list-style: none;
  margin: 18px 0 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.page-about .about-reach__cities li {
  border: 2px solid var(--tx-panel-2);
  padding: 6px 12px;
  font-size: 14px;
  line-height: 1.4;
  color: var(--tx-mist);
}

.page-about .about-reach__text {
  display: grid;
  gap: 16px;
}

.page-about .about-reach__text p {
  margin: 0;
  max-width: 56ch;
  font-size: 16px;
  line-height: 1.85;
  color: var(--tx-mist);
}

.page-about .about-reach__band {
  margin: clamp(24px, 4vw, 44px) 0 0;
  border: var(--tx-line) solid var(--tx-panel);
}

@media (min-width: 900px) {
  .page-about .about-reach__grid {
    grid-template-columns: minmax(0, 1.1fr) minmax(0, 0.9fr);
  }
}

/* ---------- 合作生态 ---------- */
.page-about .about-partners__title {
  margin: 10px 0 12px;
  font-size: clamp(28px, 4.4vw, 56px);
  line-height: 1.08;
  color: var(--tx-white);
  max-width: 20ch;
}

.page-about .about-partners__lead {
  margin: 0;
  max-width: var(--tx-read);
  color: var(--tx-mist);
}

.page-about .about-partners__flow {
  list-style: none;
  margin: clamp(26px, 4vw, 44px) 0 0;
  padding: 0;
  display: grid;
  gap: 0;
  border-top: var(--tx-line) solid var(--tx-panel);
}

.page-about .about-partners__step {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 6px 18px;
  padding: 22px 0 24px;
  border-bottom: var(--tx-line) solid var(--tx-panel);
}

.page-about .about-partners__idx {
  grid-row: span 2;
  font-size: clamp(20px, 2.4vw, 26px);
  line-height: 1.2;
  color: var(--tx-lime);
}

.page-about .about-partners__stepTitle {
  margin: 0;
  font-size: clamp(18px, 1.6vw, 21px);
  line-height: 1.4;
  color: var(--tx-white);
}

.page-about .about-partners__step p {
  margin: 0;
  max-width: 62ch;
  font-size: 16px;
  line-height: 1.8;
  color: var(--tx-mist);
}

.page-about .about-partners__more {
  margin: clamp(22px, 3vw, 32px) 0 0;
  font-size: 16px;
  line-height: 1.8;
  color: var(--tx-mist);
}

.page-about .about-partners__more a {
  color: var(--tx-cyan);
  text-decoration: none;
  border-bottom: 2px solid rgba(23, 224, 255, 0.45);
}

.page-about .about-partners__more a:hover,
.page-about .about-partners__more a:focus-visible {
  color: var(--tx-lava);
  border-bottom-color: var(--tx-lava);
}

@media (min-width: 820px) {
  .page-about .about-partners__flow {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 3px;
    background: var(--tx-panel);
    border: var(--tx-line) solid var(--tx-panel);
  }

  .page-about .about-partners__step {
    grid-template-columns: minmax(0, 1fr);
    gap: 10px;
    padding: 26px 22px 28px;
    background: var(--tx-deep-2);
    border-bottom: 0;
  }

  .page-about .about-partners__idx {
    grid-row: auto;
  }
}

/* ---------- 资质与信息安全 ---------- */
.page-about .about-cert__panel {
  background: var(--tx-paper);
  color: var(--tx-ink);
  border: var(--tx-line) solid var(--tx-ink);
  box-shadow: var(--tx-shadow-hard);
  padding: clamp(22px, 4vw, 52px);
  max-width: 960px;
}

.page-about .about-cert__eyebrow {
  color: var(--about-paper-accent);
}

.page-about .about-cert__title {
  margin: 10px 0 14px;
  font-size: clamp(26px, 3.6vw, 44px);
  line-height: 1.1;
  color: var(--tx-ink);
}

.page-about .about-cert__lead {
  margin: 0;
  max-width: 58ch;
  font-size: 16px;
  line-height: 1.85;
  color: #33424C;
}

.page-about .about-cert__list {
  list-style: none;
  margin: 26px 0 0;
  padding: 0;
  display: grid;
  gap: 18px;
}

.page-about .about-cert__item {
  border: 2px solid rgba(16, 22, 28, 0.32);
  padding: 18px 18px 20px;
  display: grid;
  gap: 8px;
}

.page-about .about-cert__mark {
  font-family: var(--tx-font-mono);
  font-size: 20px;
  font-weight: 700;
  letter-spacing: 0.02em;
  color: var(--about-paper-accent);
}

.page-about .about-cert__desc {
  margin: 0;
  font-size: 15px;
  line-height: 1.75;
  color: #3C4A54;
}

@media (min-width: 700px) {
  .page-about .about-cert__list {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

/* ---------- 服务响应 ---------- */
.page-about .about-contact__band {
  padding: clamp(26px, 4vw, 60px);
}

.page-about .about-contact__title {
  margin: 10px 0 16px;
  font-size: clamp(26px, 4.2vw, 52px);
  line-height: 1.08;
  color: var(--tx-white);
  max-width: 18ch;
}

.page-about .about-contact__text {
  margin: 0;
  max-width: 62ch;
  font-size: 16px;
  line-height: 1.85;
  color: var(--tx-mist);
}

.page-about .about-contact__actions {
  margin-top: clamp(22px, 3vw, 34px);
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.page-about .about-contact__btn {
  text-decoration: none;
}

/* ---------- 窄屏收紧 ---------- */
@media (max-width: 480px) {
  .page-about .about-hero__accent {
    padding-left: 12px;
    border-left-width: 4px;
  }

  .page-about .about-tl__item {
    padding-left: 34px;
  }

  .page-about .about-tl__list::before {
    left: 8px;
  }
}