.page-about {
  --about-line: rgba(58, 107, 96, .5);
  --about-panel: rgba(18, 58, 47, .82);
  --about-cut: 16px;
}

/* ---------- 右侧竖排注释轨道 ---------- */
.page-about .about-spine {
  display: none;
}

@media (min-width: 1440px) {
  .page-about .about-spine {
    position: fixed;
    z-index: 3;
    top: calc(var(--bar-h) + 56px);
    right: 10px;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 18px;
    pointer-events: none;
  }

  .page-about .about-spine__tag,
  .page-about .about-spine__code {
    writing-mode: vertical-rl;
    font-family: var(--font-mono);
    font-size: 10px;
    letter-spacing: .34em;
    text-transform: uppercase;
  }

  .page-about .about-spine__tag {
    color: var(--sage);
  }

  .page-about .about-spine__code {
    color: var(--ice);
  }

  .page-about .about-spine__line {
    width: 1px;
    height: 130px;
    background: linear-gradient(180deg, var(--ice) 0%, rgba(127, 216, 255, 0) 100%);
    opacity: .7;
  }
}

/* ---------- 首屏框景 ---------- */
.page-about .about-hero {
  padding-top: calc(var(--bar-h) + 22px);
}

.page-about .about-hero__frame {
  position: relative;
  padding: clamp(22px, 3.4vw, 48px);
  border: 1px solid var(--about-line);
  background:
    radial-gradient(120% 130% at 0% 0%, rgba(44, 110, 136, .22) 0%, rgba(44, 110, 136, 0) 58%),
    repeating-linear-gradient(90deg, rgba(127, 216, 255, .05) 0 1px, rgba(127, 216, 255, 0) 1px 56px),
    linear-gradient(150deg, rgba(18, 58, 47, .94), rgba(11, 42, 34, .98));
}

.page-about .about-hero__frame::before {
  content: "";
  position: absolute;
  inset: 9px;
  pointer-events: none;
  opacity: .5;
  background:
    linear-gradient(var(--ice), var(--ice)) 0 0 / 24px 2px no-repeat,
    linear-gradient(var(--ice), var(--ice)) 0 0 / 2px 24px no-repeat,
    linear-gradient(var(--ice), var(--ice)) 100% 0 / 24px 2px no-repeat,
    linear-gradient(var(--ice), var(--ice)) 100% 0 / 2px 24px no-repeat,
    linear-gradient(var(--ice), var(--ice)) 0 100% / 24px 2px no-repeat,
    linear-gradient(var(--ice), var(--ice)) 0 100% / 2px 24px no-repeat,
    linear-gradient(var(--ice), var(--ice)) 100% 100% / 24px 2px no-repeat,
    linear-gradient(var(--ice), var(--ice)) 100% 100% / 2px 24px no-repeat;
}

.page-about .about-hero__grid {
  display: grid;
  gap: 30px;
}

@media (min-width: 900px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    gap: 48px;
    align-items: end;
  }
}

.page-about .about-hero__kicker {
  margin: 0 0 16px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .2em;
  text-transform: uppercase;
  color: var(--ice);
}

.page-about .about-hero__title {
  margin: 0 0 20px;
  font-size: clamp(30px, 5.2vw, 60px);
  font-weight: 900;
  line-height: 1.06;
  letter-spacing: -.02em;
  color: var(--mist);
}

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

.page-about .about-hero__lead {
  margin: 0 0 26px;
  max-width: 620px;
  font-size: 17px;
  line-height: 1.75;
  color: var(--sage);
}

.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

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

.page-about .about-stat {
  padding: 16px 15px 18px;
  background: rgba(11, 42, 34, .78);
}

.page-about .about-stat__value {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(22px, 2.6vw, 32px);
  font-weight: 700;
  letter-spacing: -.01em;
  color: var(--ice);
  font-variant-numeric: tabular-nums;
}

.page-about .about-stat__unit {
  margin-left: .18em;
  font-size: .5em;
  color: var(--sage);
}

.page-about .about-stat__label {
  display: block;
  margin-top: 8px;
  font-size: 13px;
  color: var(--sage);
}

/* ---------- 横向时间轴主干 ---------- */
.page-about .about-axis__scroll {
  padding-bottom: 16px;
  overflow-x: auto;
  overscroll-behavior-x: contain;
  -webkit-overflow-scrolling: touch;
}

.page-about .about-axis__track {
  position: relative;
  display: flex;
  min-width: 880px;
  margin: 0;
  padding: 0 0 6px;
  list-style: none;
}

.page-about .about-axis__track::before {
  content: "";
  position: absolute;
  top: 19px;
  left: 0;
  right: 0;
  height: 1px;
  background: linear-gradient(90deg, rgba(44, 110, 136, 0) 0%, var(--ice-deep) 5%, var(--ice-deep) 95%, rgba(44, 110, 136, 0) 100%);
}

.page-about .about-axis__node {
  flex: 1 0 25%;
  min-width: 220px;
  padding-right: 22px;
}

.page-about .about-axis__btn {
  position: relative;
  display: block;
  width: 100%;
  padding: 42px 0 0;
  border: 0;
  background: none;
  color: inherit;
  font: inherit;
  text-align: left;
  cursor: pointer;
}

.page-about .about-axis__diamond {
  position: absolute;
  top: 13px;
  left: 0;
  width: 14px;
  height: 14px;
  background: var(--pine-mid);
  border: 1px solid var(--ice);
  transform: rotate(45deg);
  transition: background var(--speed) ease, box-shadow var(--speed) ease;
}

.page-about .about-axis__btn[aria-expanded="true"] .about-axis__diamond {
  background: var(--ice);
  box-shadow: 0 0 0 5px rgba(127, 216, 255, .16);
}

.page-about .about-axis__stage {
  display: block;
  margin-bottom: 8px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .18em;
  color: var(--ice-deep);
}

.page-about .about-axis__name {
  display: block;
  font-size: 17px;
  font-weight: 700;
  line-height: 1.4;
  color: var(--mist);
}

.page-about .about-axis__btn[aria-expanded="true"] .about-axis__name {
  color: var(--ice);
}

.page-about .about-axis__panel {
  margin-top: 14px;
}

.page-about .about-axis__panel p {
  margin: 0;
  max-width: 34em;
  font-size: 15px;
  line-height: 1.75;
  color: var(--sage);
}

/* ---------- 三条业务线 ---------- */
.page-about .about-lines__grid {
  display: grid;
  gap: 18px;
}

@media (min-width: 820px) {
  .page-about .about-lines__grid {
    grid-template-columns: 1.15fr 1fr .9fr;
    gap: 22px;
    align-items: start;
  }

  .page-about .about-lines__grid > :nth-child(2) {
    margin-top: 40px;
  }

  .page-about .about-lines__grid > :nth-child(3) {
    margin-top: 84px;
  }
}

.page-about .about-card {
  position: relative;
  padding: 26px 22px 28px;
  background: linear-gradient(160deg, rgba(18, 58, 47, .92), rgba(11, 42, 34, .96));
  clip-path: polygon(0 0, calc(100% - var(--about-cut)) 0, 100% var(--about-cut), 100% 100%, var(--about-cut) 100%, 0 calc(100% - var(--about-cut)));
}

.page-about .about-card--ice {
  background: linear-gradient(160deg, rgba(30, 74, 84, .9), rgba(11, 42, 34, .96));
}

.page-about .about-card--edge {
  background: linear-gradient(160deg, rgba(44, 110, 136, .55), rgba(11, 42, 34, .96));
}

.page-about .about-card__tag {
  margin: 0 0 14px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .22em;
  text-transform: uppercase;
  color: var(--ice);
}

.page-about .about-card__title {
  margin: 0 0 12px;
  font-size: 24px;
  font-weight: 900;
  line-height: 1.2;
  color: var(--mist);
}

.page-about .about-card__body {
  margin: 0 0 18px;
  font-size: 15px;
  line-height: 1.75;
  color: var(--sage);
}

.page-about .about-card__meta {
  margin: 0;
  padding-top: 14px;
  border-top: 1px solid rgba(58, 107, 96, .55);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .04em;
  color: var(--ice-deep);
}

/* ---------- 服务版图 ---------- */
.page-about .about-reach__grid {
  align-items: start;
}

.page-about .about-reach__left {
  min-width: 0;
}

.page-about .about-map {
  display: grid;
  grid-template-columns: repeat(8, minmax(0, 1fr));
  gap: 7px;
  margin: 0 0 26px;
  padding: 0;
  list-style: none;
}

.page-about .about-map__cell {
  aspect-ratio: 1 / 1;
  background: rgba(127, 216, 255, .1);
  border: 1px solid rgba(127, 216, 255, .16);
  transition: background var(--speed) ease, border-color var(--speed) ease;
}

.page-about .about-map__cell:hover {
  background: rgba(127, 216, 255, .36);
  border-color: var(--ice);
}

.page-about .about-map__cell.is-home {
  background: var(--track);
  border-color: var(--track);
  box-shadow: 0 0 0 4px rgba(255, 106, 43, .16);
}

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

.page-about .about-reach__fact {
  padding: 14px 0;
  border-top: 1px solid rgba(58, 107, 96, .45);
}

.page-about .about-reach__fact dt {
  margin-bottom: 6px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .16em;
  color: var(--ice);
}

.page-about .about-reach__fact dd {
  margin: 0;
  font-size: 15px;
  line-height: 1.72;
  color: var(--sage);
}

.page-about .about-reach__shot {
  margin: 0 0 24px;
}

@media (min-width: 900px) {
  .page-about .about-reach__shot {
    margin-top: 24px;
  }
}

/* ---------- 三级校验 ---------- */
.page-about .about-check__grid {
  align-items: start;
}

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

.page-about .about-check__step {
  position: relative;
  padding: 24px 22px 26px;
  background: linear-gradient(150deg, rgba(18, 58, 47, .9), rgba(11, 42, 34, .95));
  border-left: 3px solid var(--ice-deep);
}

.page-about .about-check__step--ice {
  border-left-color: var(--ice);
  background: linear-gradient(150deg, rgba(30, 74, 84, .88), rgba(11, 42, 34, .95));
}

.page-about .about-check__step--track {
  border-left-color: var(--track);
  background: linear-gradient(150deg, rgba(44, 110, 136, .5), rgba(11, 42, 34, .95));
}

.page-about .about-check__step::after {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 56px;
  height: 3px;
  background: var(--ice);
  opacity: .45;
}

.page-about .about-check__step--ice::after {
  width: 92px;
  opacity: .7;
}

.page-about .about-check__step--track::after {
  width: 128px;
  background: var(--track);
  opacity: 1;
}

.page-about .about-check__code {
  margin: 0 0 10px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .16em;
  color: var(--ice);
}

.page-about .about-check__name {
  margin: 0 0 10px;
  font-size: 19px;
  font-weight: 800;
  line-height: 1.3;
  color: var(--mist);
}

.page-about .about-check__body {
  margin: 0;
  font-size: 15px;
  line-height: 1.75;
  color: var(--sage);
}

.page-about .about-check__shot {
  margin: 24px 0 0;
}

@media (min-width: 900px) {
  .page-about .about-check__shot {
    margin-top: 44px;
  }
}

/* ---------- 团队构成 ---------- */
.page-about .about-team__shot {
  margin: 0 0 26px;
}

.page-about .about-team__grid {
  display: grid;
  gap: 1px;
  background: rgba(58, 107, 96, .45);
  border: 1px solid rgba(58, 107, 96, .45);
}

@media (min-width: 820px) {
  .page-about .about-team__grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .page-about .about-team__cell:nth-child(2) {
    transform: translateY(20px);
  }

  .page-about .about-team__cell:nth-child(3) {
    transform: translateY(40px);
  }
}

.page-about .about-team__cell {
  padding: 26px 22px 30px;
  background: rgba(11, 42, 34, .86);
}

.page-about .about-team__cell--ice {
  background: linear-gradient(160deg, rgba(30, 74, 84, .9), rgba(11, 42, 34, .92));
}

.page-about .about-team__num {
  margin: 0 0 12px;
  font-family: var(--font-mono);
  font-size: 38px;
  font-weight: 700;
  line-height: 1;
  color: var(--ice);
  font-variant-numeric: tabular-nums;
}

.page-about .about-team__num span {
  margin-left: .16em;
  font-size: .38em;
  color: var(--sage);
}

.page-about .about-team__name {
  margin: 0 0 10px;
  font-size: 17px;
  font-weight: 800;
  color: var(--mist);
}

.page-about .about-team__cell p:last-child {
  margin: 0;
  font-size: 15px;
  line-height: 1.75;
  color: var(--sage);
}

/* ---------- 资质条目 ---------- */
.page-about .about-creds__list {
  border-top: 1px solid rgba(58, 107, 96, .5);
}

.page-about .about-creds__item {
  border-bottom: 1px solid rgba(58, 107, 96, .5);
}

.page-about .about-creds__btn {
  display: grid;
  grid-template-columns: auto 1fr auto;
  grid-template-areas:
    "idx name sign"
    "idx lead sign";
  gap: 2px 16px;
  align-items: center;
  width: 100%;
  padding: 20px 4px;
  border: 0;
  background: none;
  color: inherit;
  font: inherit;
  text-align: left;
  cursor: pointer;
}

.page-about .about-creds__idx {
  grid-area: idx;
  align-self: start;
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--ice-deep);
}

.page-about .about-creds__name {
  grid-area: name;
  font-size: 17px;
  font-weight: 700;
  line-height: 1.45;
  color: var(--mist);
}

.page-about .about-creds__btn[aria-expanded="true"] .about-creds__name {
  color: var(--ice);
}

.page-about .about-creds__lead {
  grid-area: lead;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .08em;
  color: var(--sage);
}

.page-about .about-creds__sign {
  grid-area: sign;
  font-family: var(--font-mono);
  font-size: 20px;
  color: var(--ice);
}

.page-about .about-creds__panel {
  padding: 0 4px 22px 42px;
}

.page-about .about-creds__panel p {
  margin: 0;
  max-width: 44em;
  font-size: 15px;
  line-height: 1.78;
  color: var(--sage);
}

/* ---------- 合作生态 ---------- */
.page-about .about-partners__grid {
  align-items: start;
}

.page-about .about-partners__col {
  padding: 28px 24px 30px;
  background: linear-gradient(155deg, rgba(18, 58, 47, .9), rgba(11, 42, 34, .95));
  border-top: 3px solid var(--ice-deep);
}

.page-about .about-partners__col--ice {
  border-top-color: var(--ice);
  background: linear-gradient(155deg, rgba(30, 74, 84, .86), rgba(11, 42, 34, .95));
}

@media (min-width: 900px) {
  .page-about .about-partners__col--ice {
    margin-top: 36px;
  }
}

.page-about .about-partners__num {
  margin: 0 0 14px;
  font-family: var(--font-mono);
  font-size: 42px;
  font-weight: 700;
  line-height: 1;
  color: var(--mist);
  font-variant-numeric: tabular-nums;
}

.page-about .about-partners__num span {
  margin-left: .14em;
  font-size: .32em;
  color: var(--ice);
}

.page-about .about-partners__name {
  margin: 0 0 12px;
  font-size: 18px;
  font-weight: 800;
  line-height: 1.35;
  color: var(--mist);
}

.page-about .about-partners__col p {
  margin: 0 0 18px;
  font-size: 15px;
  line-height: 1.75;
  color: var(--sage);
}

.page-about .about-partners__cta {
  margin-top: 2px;
}

/* ---------- 收尾 ---------- */
.page-about .about-next__panel {
  position: relative;
  padding: clamp(26px, 3.6vw, 46px);
  border: 1px solid var(--about-line);
  background:
    linear-gradient(105deg, rgba(44, 110, 136, .3) 0%, rgba(44, 110, 136, 0) 52%),
    linear-gradient(160deg, rgba(18, 58, 47, .95), rgba(11, 42, 34, .98));
}

.page-about .about-next__panel::after {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 120px;
  height: 3px;
  background: var(--track);
}

.page-about .about-next__title {
  margin: 0 0 14px;
  font-size: clamp(22px, 2.8vw, 32px);
  font-weight: 900;
  line-height: 1.2;
  color: var(--mist);
}

.page-about .about-next__lead {
  margin: 0 0 24px;
  max-width: 46em;
  font-size: 16px;
  line-height: 1.75;
  color: var(--sage);
}

.page-about .about-next__links {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

/* ---------- 窄屏收紧 ---------- */
@media (max-width: 640px) {
  .page-about .about-hero__stats {
    grid-template-columns: minmax(0, 1fr);
  }

  .page-about .about-map {
    grid-template-columns: repeat(6, minmax(0, 1fr));
    gap: 6px;
  }

  .page-about .about-creds__btn {
    grid-template-columns: auto 1fr auto;
    gap: 4px 12px;
  }

  .page-about .about-creds__panel {
    padding-left: 4px;
  }

  .page-about .about-team__cell,
  .page-about .about-card,
  .page-about .about-partners__col {
    padding-left: 18px;
    padding-right: 18px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-axis__diamond,
  .page-about .about-map__cell {
    transition: none;
  }
}