.page-about {
  --about-pad: 56px;
  background: var(--ink-900);
  color: var(--white);
}

.page-about .about-section {
  padding: var(--about-pad) 0;
}

.page-about .about-crumbs {
  grid-column: 1 / -1;
}

.page-about .about-crumbs ol {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 0 0 4px;
  padding: 0;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--mist);
}

.page-about .about-crumbs li + li::before {
  content: "/";
  margin-right: 8px;
  color: var(--steel);
}

.page-about .about-crumbs a {
  color: var(--mist);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color 0.2s ease, border-color 0.2s ease;
}

.page-about .about-crumbs a:hover,
.page-about .about-crumbs a:focus-visible {
  color: var(--cyan);
  border-bottom-color: var(--cyan);
}

.page-about .about-head {
  max-width: 720px;
}

.page-about .about-head__title {
  margin: 10px 0 16px;
  font-size: clamp(26px, 5vw, 44px);
  line-height: 1.22;
  letter-spacing: -0.01em;
}

.page-about .prose {
  margin: 0;
  font-size: 16px;
  line-height: 1.75;
  color: var(--mist);
  max-width: 68ch;
}

/* ---------- 开场色带 ---------- */
.page-about .about-hero {
  position: relative;
  overflow: hidden;
  padding-top: 40px;
  padding-bottom: 56px;
  background:
    radial-gradient(circle at 84% 14%, rgba(0, 229, 255, 0.2), transparent 58%),
    radial-gradient(circle at 8% 92%, rgba(255, 106, 26, 0.16), transparent 52%),
    linear-gradient(158deg, var(--teal-900), var(--teal-950) 58%, var(--ink-900));
  border-bottom: 1px solid var(--steel);
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background: repeating-linear-gradient(114deg, rgba(232, 238, 247, 0.05) 0 1px, transparent 1px 52px);
  pointer-events: none;
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  right: -6%;
  bottom: -88px;
  width: 62%;
  height: 180px;
  background: linear-gradient(90deg, rgba(255, 106, 26, 0.85), rgba(255, 106, 26, 0));
  transform: skewY(calc(var(--diag) * -1));
  opacity: 0.5;
  pointer-events: none;
}

.page-about .about-hero__grid {
  position: relative;
  z-index: 1;
  display: grid;
  gap: 28px;
}

.page-about .about-hero__title {
  margin: 12px 0 18px;
  font-size: clamp(30px, 7vw, 58px);
  line-height: 1.14;
  letter-spacing: -0.015em;
  color: var(--white);
}

.page-about .about-hero__lead {
  margin: 0;
  max-width: 52ch;
  font-size: 16px;
  line-height: 1.78;
  color: var(--white);
  opacity: 0.88;
}

.page-about .about-hero__stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin-top: 30px;
  border: 1px solid var(--steel);
  border-radius: var(--radius);
  background: var(--steel);
  overflow: hidden;
}

.page-about .about-hero__stats .stat {
  display: flex;
  flex-direction: column;
  gap: 5px;
  padding: 14px 14px 16px;
  background: rgba(11, 18, 32, 0.62);
  transition: background 0.2s ease;
}

.page-about .about-hero__stats .stat:hover {
  background: rgba(0, 229, 255, 0.1);
}

.page-about .about-hero__stats .stat__num {
  font-family: var(--font-mono);
  font-size: 24px;
  font-weight: 700;
  line-height: 1.1;
  color: var(--lime);
}

.page-about .about-hero__stats .stat__label {
  font-size: 12px;
  line-height: 1.5;
  letter-spacing: 0.04em;
  color: var(--mist);
}

.page-about .about-hero__figure {
  position: relative;
  margin: 0;
  padding-top: 12px;
}

.page-about .about-hero__figure::before {
  content: "";
  position: absolute;
  top: 0;
  right: 0;
  width: 74px;
  height: 74px;
  background: var(--orange);
  transform: skewY(calc(var(--diag) * -1));
  opacity: 0.9;
}

.page-about .about-hero__figure img {
  display: block;
  width: 100%;
  height: auto;
  border-radius: var(--radius);
  border: 1px solid rgba(0, 229, 255, 0.32);
  filter: saturate(0.86);
}

.page-about .about-hero__figure figcaption {
  margin-top: 10px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  color: var(--mist);
}

/* ---------- 时间线 ---------- */
.page-about .about-timeline {
  background: var(--ink-900);
}

.page-about .tl {
  list-style: none;
  position: relative;
  margin: 34px 0 0;
  padding: 0 0 0 32px;
}

.page-about .tl::before {
  content: "";
  position: absolute;
  left: 9px;
  top: 8px;
  bottom: 10px;
  width: 2px;
  background: linear-gradient(180deg, var(--cyan), var(--orange) 48%, var(--lime) 76%, var(--steel));
  opacity: 0.75;
}

.page-about .tl__item {
  position: relative;
  padding-bottom: 26px;
}

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

.page-about .tl__item::before {
  content: "";
  position: absolute;
  left: -28px;
  top: 7px;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--ink-900);
  border: 2px solid var(--cyan);
  transition: background 0.2s ease, border-color 0.2s ease, box-shadow 0.2s ease;
}

.page-about .tl__item:hover::before {
  background: var(--lime);
  border-color: var(--lime);
  box-shadow: 0 0 0 5px rgba(198, 255, 61, 0.16);
}

.page-about .tl__head {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 10px;
}

.page-about .tl__year {
  font-family: var(--font-mono);
  font-size: 20px;
  font-weight: 700;
  letter-spacing: 0.04em;
  color: var(--orange);
}

.page-about .tl__title {
  margin: 0;
  font-size: 17px;
  font-weight: 700;
  letter-spacing: 0.01em;
  color: var(--white);
}

.page-about .tl__text {
  margin: 8px 0 0;
  max-width: 62ch;
  font-size: 15px;
  line-height: 1.78;
  color: var(--mist);
}

.page-about .tl__kw {
  margin: 8px 0 0;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.12em;
  color: var(--cyan);
  transition: opacity 0.2s ease, transform 0.2s ease;
}

.page-about .tl__kw span {
  color: var(--steel);
  margin-right: 8px;
}

@media (min-width: 900px) and (hover: hover) {
  .page-about .tl__kw {
    opacity: 0;
    transform: translateY(-4px);
  }

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

/* ---------- 团队 ---------- */
.page-about .about-team {
  background: var(--ink-800);
  border-top: 1px solid var(--steel);
  border-bottom: 1px solid var(--steel);
}

.page-about .about-team__grid {
  display: grid;
  gap: 32px;
  margin-top: 32px;
}

.page-about .team-chart {
  position: relative;
  width: 100%;
  max-width: 250px;
  margin: 0 auto;
}

.page-about .team-ring {
  display: block;
  width: 100%;
  height: auto;
}

.page-about .team-ring__bg {
  fill: none;
  stroke: rgba(42, 58, 82, 0.7);
  stroke-width: 22;
}

.page-about .team-ring__seg {
  fill: none;
  stroke-width: 22;
  transition: stroke-width 0.2s ease, filter 0.2s ease;
}

.page-about .team-ring__seg--content {
  stroke: var(--cyan);
}

.page-about .team-ring__seg--tech {
  stroke: var(--orange);
}

.page-about .team-ring__seg--ops {
  stroke: var(--lime);
}

.page-about .team-ring__seg:hover {
  stroke-width: 30;
}

.page-about .team-chart__center {
  position: absolute;
  inset: 0;
  display: grid;
  place-content: center;
  text-align: center;
  pointer-events: none;
}

.page-about .team-chart__center strong {
  display: block;
  font-family: var(--font-mono);
  font-size: 34px;
  font-weight: 700;
  line-height: 1;
  color: var(--white);
}

.page-about .team-chart__center span {
  display: block;
  margin-top: 6px;
  font-size: 12px;
  letter-spacing: 0.16em;
  color: var(--mist);
}

.page-about .team-legend {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 14px;
}

.page-about .team-legend__item {
  display: grid;
  grid-template-columns: 44px minmax(0, 1fr);
  gap: 12px;
  padding: 14px 16px;
  border-radius: var(--radius);
  border: 1px solid var(--steel);
  background: rgba(11, 18, 32, 0.55);
  border-left-width: 3px;
  transition: border-color 0.2s ease, background 0.2s ease, transform 0.2s ease;
}

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

.page-about .team-legend__item--tech {
  border-left-color: var(--orange);
}

.page-about .team-legend__item--ops {
  border-left-color: var(--lime);
}

.page-about .team-legend__item:hover {
  background: rgba(0, 229, 255, 0.08);
  transform: translateX(4px);
}

.page-about .team-legend__num {
  font-family: var(--font-mono);
  font-size: 22px;
  font-weight: 700;
  line-height: 1.2;
  color: var(--white);
}

.page-about .team-legend__name {
  margin: 0 0 6px;
  font-size: 15px;
  font-weight: 700;
  color: var(--white);
}

.page-about .team-legend__desc {
  margin: 0;
  font-size: 14px;
  line-height: 1.72;
  color: var(--mist);
}

.page-about .about-team__flow {
  display: grid;
  gap: 24px;
  margin-top: 34px;
}

.page-about .about-team__figure {
  position: relative;
  margin: 0;
}

.page-about .about-team__figure img {
  display: block;
  width: 100%;
  height: auto;
  border-radius: var(--radius);
  border: 1px solid var(--steel);
}

.page-about .about-team__figure figcaption {
  margin-top: 10px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.12em;
  color: var(--mist);
}

.page-about .flow-steps {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 10px;
  counter-reset: flow;
}

.page-about .flow-steps__item {
  position: relative;
  padding: 14px 16px 14px 46px;
  border-radius: var(--radius);
  background: rgba(11, 18, 32, 0.6);
  border: 1px solid var(--steel);
  transition: border-color 0.2s ease;
}

.page-about .flow-steps__item:hover {
  border-color: var(--cyan);
}

.page-about .flow-steps__no {
  position: absolute;
  left: 14px;
  top: 14px;
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.08em;
  color: var(--orange);
}

.page-about .flow-steps__item h3 {
  margin: 0 0 5px;
  font-size: 15px;
  font-weight: 700;
  color: var(--white);
}

.page-about .flow-steps__item p {
  margin: 0;
  font-size: 14px;
  line-height: 1.7;
  color: var(--mist);
}

/* ---------- 城市坐标 ---------- */
.page-about .about-coordz {
  background: linear-gradient(178deg, var(--teal-950), var(--teal-900) 62%, var(--ink-900));
  border-top: 1px solid rgba(0, 229, 255, 0.2);
}

.page-about .about-coordz__grid {
  display: grid;
  gap: 28px;
  margin-top: 30px;
}

.page-about .about-coordz__figure {
  position: relative;
  margin: 0;
  padding: 10px;
  border-radius: var(--radius);
  border: 1px solid rgba(0, 229, 255, 0.28);
  background: rgba(11, 18, 32, 0.45);
}

.page-about .about-coordz__figure img {
  display: block;
  width: 100%;
  height: auto;
  border-radius: calc(var(--radius) - 4px);
}

.page-about .about-coordz__figure figcaption {
  margin-top: 10px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.12em;
  color: var(--mist);
}

.page-about .coordz-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 12px;
}

.page-about .coordz-list__item {
  position: relative;
  padding: 14px 16px 14px 52px;
  border-radius: var(--radius);
  border: 1px solid var(--steel);
  background: rgba(11, 18, 32, 0.55);
  transition: border-color 0.2s ease, background 0.2s ease;
}

.page-about .coordz-list__item:hover {
  border-color: var(--cyan);
  background: rgba(0, 229, 255, 0.08);
}

.page-about .coordz-list__no {
  position: absolute;
  left: 16px;
  top: 15px;
  width: 24px;
  height: 24px;
  display: grid;
  place-content: center;
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 700;
  color: var(--ink-900);
  background: var(--cyan);
  border-radius: 4px;
}

.page-about .coordz-list__item h3 {
  margin: 0 0 6px;
  font-size: 15px;
  font-weight: 700;
  color: var(--white);
}

.page-about .coordz-list__item p {
  margin: 0;
  font-size: 14px;
  line-height: 1.7;
  color: var(--mist);
}

.page-about .coordz-list__note {
  margin: 16px 0 0;
  padding-top: 14px;
  border-top: 1px dashed var(--steel);
  font-size: 13px;
  line-height: 1.7;
  color: var(--lime);
}

/* ---------- 产品线 ---------- */
.page-about .about-lines {
  background: var(--ink-900);
}

.page-about .tree {
  display: grid;
  gap: 20px;
  margin-top: 32px;
}

.page-about .tree__root {
  padding: 20px;
  border-radius: var(--radius);
  border: 1px solid rgba(0, 229, 255, 0.4);
  background: linear-gradient(150deg, rgba(0, 229, 255, 0.16), rgba(11, 18, 32, 0.92));
}

.page-about .tree__root-title {
  display: block;
  margin: 8px 0 3px;
  font-size: 19px;
  font-weight: 700;
  color: var(--white);
}

.page-about .tree__root-desc {
  margin: 0;
  font-size: 14px;
  line-height: 1.72;
  color: var(--mist);
}

.page-about .tree__branches {
  list-style: none;
  position: relative;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 12px;
}

.page-about .tree__node {
  position: relative;
  padding: 14px 16px;
  border-radius: var(--radius);
  border: 1px solid var(--steel);
  background: rgba(16, 27, 46, 0.72);
  border-left-width: 3px;
  transition: border-color 0.2s ease, transform 0.2s ease, background 0.2s ease;
}

.page-about .tree__node--a {
  border-left-color: var(--orange);
}

.page-about .tree__node--b {
  border-left-color: var(--cyan);
}

.page-about .tree__node--c {
  border-left-color: var(--lime);
}

.page-about .tree__node--d {
  border-left-color: var(--wine-700);
}

.page-about .tree__node:hover {
  transform: translateX(4px);
  background: rgba(0, 229, 255, 0.08);
}

.page-about .tree__node h3 {
  margin: 0 0 6px;
  font-size: 15px;
  font-weight: 700;
  color: var(--white);
}

.page-about .tree__node p {
  margin: 0;
  font-size: 14px;
  line-height: 1.72;
  color: var(--mist);
}

/* ---------- 合作生态 ---------- */
.page-about .about-partners {
  background: var(--ink-800);
  border-top: 1px solid var(--steel);
}

.page-about .pn-nums {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 10px;
  margin-top: 30px;
}

.page-about .pn-nums__item {
  display: flex;
  flex-direction: column;
  gap: 4px;
  padding: 14px 16px;
  border-radius: var(--radius);
  border: 1px solid var(--steel);
  background: rgba(11, 18, 32, 0.6);
}

.page-about .pn-nums__num {
  font-family: var(--font-mono);
  font-size: 26px;
  font-weight: 700;
  line-height: 1.1;
  color: var(--cyan);
}

.page-about .pn-nums__label {
  font-size: 12px;
  line-height: 1.5;
  letter-spacing: 0.04em;
  color: var(--mist);
}

.page-about .pn-ways {
  display: grid;
  gap: 14px;
  margin-top: 26px;
}

.page-about .pn-ways__col {
  padding: 16px 16px 18px;
  border-radius: var(--radius);
  border-top: 2px solid var(--orange);
  background: rgba(11, 18, 32, 0.5);
}

.page-about .pn-ways__col h3 {
  margin: 0 0 8px;
  font-size: 15px;
  font-weight: 700;
  color: var(--white);
}

.page-about .pn-ways__col p {
  margin: 0;
  font-size: 14px;
  line-height: 1.75;
  color: var(--mist);
}

.page-about .pn-table-title {
  margin: 34px 0 14px;
  font-size: 15px;
  font-weight: 700;
  letter-spacing: 0.06em;
  color: var(--white);
}

.page-about .pn-table {
  display: grid;
  gap: 8px;
}

.page-about .pn-row {
  border: 1px solid var(--steel);
  border-radius: var(--radius);
  background: rgba(11, 18, 32, 0.62);
  padding: 0 14px;
  transition: border-color 0.2s ease;
}

.page-about .pn-row[open] {
  border-color: rgba(0, 229, 255, 0.45);
}

.page-about .pn-row summary {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  justify-content: space-between;
  gap: 10px;
  padding: 13px 0;
  cursor: pointer;
  list-style: none;
  transition: color 0.2s ease;
}

.page-about .pn-row summary::-webkit-details-marker {
  display: none;
}

.page-about .pn-row summary:hover {
  color: var(--cyan);
}

.page-about .pn-row__city {
  font-size: 15px;
  font-weight: 700;
  letter-spacing: 0.06em;
  color: var(--white);
}

.page-about .pn-row summary:hover .pn-row__city {
  color: var(--cyan);
}

.page-about .pn-row__meta {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--mist);
}

.page-about .pn-row__body {
  padding: 0 0 14px;
  border-top: 1px solid var(--steel);
  padding-top: 12px;
}

.page-about .pn-row__body p {
  margin: 0;
  font-size: 14px;
  line-height: 1.75;
  color: var(--mist);
}

/* ---------- 服务与响应 ---------- */
.page-about .about-service {
  background: var(--ink-900);
  border-top: 1px solid var(--steel);
}

.page-about .about-service__grid {
  display: grid;
  gap: 28px;
}

.page-about .about-service__list {
  list-style: none;
  margin: 22px 0 0;
  padding: 0;
  display: grid;
  gap: 10px;
}

.page-about .about-service__list li {
  position: relative;
  padding-left: 22px;
  font-size: 14px;
  line-height: 1.75;
  color: var(--white);
}

.page-about .about-service__list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 9px;
  width: 8px;
  height: 8px;
  background: var(--lime);
  transform: skewY(calc(var(--diag) * -1));
}

.page-about .about-service__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 26px;
}

.page-about .about-service__card {
  padding: 20px;
  border: 1px solid var(--steel);
  border-radius: var(--radius);
  background: rgba(16, 27, 46, 0.72);
}

.page-about .about-service__links {
  list-style: none;
  margin: 14px 0 0;
  padding: 0;
  display: grid;
  gap: 2px;
}

.page-about .about-service__links a {
  display: block;
  padding: 10px 0;
  font-size: 14px;
  line-height: 1.6;
  color: var(--white);
  text-decoration: none;
  border-bottom: 1px solid var(--steel);
  transition: color 0.2s ease, border-color 0.2s ease;
}

.page-about .about-service__links a:hover,
.page-about .about-service__links a:focus-visible {
  color: var(--cyan);
  border-bottom-color: var(--cyan);
}

.page-about .about-service__contact {
  margin: 16px 0 12px;
  font-size: 13px;
  line-height: 1.7;
  color: var(--mist);
}

.page-about .about-service__copy {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.1em;
  padding: 9px 14px;
  border-radius: 8px;
  border: 1px solid var(--cyan);
  background: transparent;
  color: var(--cyan);
  cursor: pointer;
  transition: background 0.2s ease, color 0.2s ease;
}

.page-about .about-service__copy:hover {
  background: var(--cyan);
  color: var(--ink-900);
}

.page-about .about-service__copy[data-copied] {
  border-color: var(--lime);
  color: var(--lime);
}

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

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

  .page-about .pn-ways {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .page-about .flow-steps {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (min-width: 900px) {
  .page-about {
    --about-pad: 88px;
  }

  .page-about .about-hero {
    padding-top: 56px;
    padding-bottom: 92px;
  }

  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 1.15fr) minmax(0, 0.85fr);
    gap: 52px;
    align-items: start;
  }

  .page-about .about-hero__figure {
    margin-top: 42px;
  }

  .page-about .about-team__grid {
    grid-template-columns: 250px minmax(0, 1fr);
    gap: 40px;
    align-items: center;
  }

  .page-about .about-team__flow {
    grid-template-columns: minmax(0, 0.9fr) minmax(0, 1.1fr);
    gap: 34px;
    align-items: start;
    margin-top: 44px;
  }

  .page-about .about-coordz__grid {
    grid-template-columns: minmax(0, 0.95fr) minmax(0, 1.05fr);
    gap: 36px;
    align-items: start;
  }

  .page-about .tree {
    grid-template-columns: 280px minmax(0, 1fr);
    gap: 52px;
    align-items: center;
  }

  .page-about .tree__branches::before {
    content: "";
    position: absolute;
    left: -28px;
    top: 14%;
    bottom: 14%;
    width: 2px;
    background: linear-gradient(180deg, var(--orange), var(--cyan) 42%, var(--lime) 72%, var(--wine-700));
    opacity: 0.85;
  }

  .page-about .tree__node::before {
    content: "";
    position: absolute;
    left: -28px;
    top: 25px;
    width: 28px;
    height: 2px;
    background: var(--steel);
  }

  .page-about .tree__node:hover::before {
    background: var(--cyan);
  }

  .page-about .about-service__grid {
    grid-template-columns: minmax(0, 1.25fr) minmax(0, 0.75fr);
    gap: 44px;
    align-items: start;
  }

  .page-about .about-service__card {
    position: sticky;
    top: calc(var(--topbar-h) + 24px);
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .tl__item::before,
  .page-about .tl__kw,
  .page-about .team-legend__item,
  .page-about .tree__node,
  .page-about .coordz-list__item,
  .page-about .about-service__links a {
    transition: none;
  }
}