.page-about {
  --about-hair: rgba(31, 58, 99, 0.85);
  --about-gap-tall: clamp(40px, 7vw, 88px);
  background: var(--ink);
  color: var(--white);
  overflow-x: clip;
}

.page-about .about-hero__title {
  margin: 0 0 clamp(18px, 2.4vw, 28px);
  max-width: 15ch;
}

.page-about .about-hero__title br {
  display: none;
}

.page-about .about-hero {
  position: relative;
  padding: calc(var(--head-h) + clamp(48px, 9vw, 110px)) 0 clamp(48px, 7vw, 92px);
  border-bottom: 1px solid var(--about-hair);
}

.page-about .about-hero__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(36px, 5vw, 64px);
  align-items: end;
}

.page-about .about-hero__lead .crumbs {
  display: flex;
  gap: 8px;
  align-items: center;
  font-size: 12px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--mist);
  margin-bottom: clamp(18px, 3vw, 30px);
}

.page-about .about-hero__lead .crumbs a {
  color: var(--mist);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color 160ms ease, border-color 160ms ease;
}

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

.page-about .about-hero__lede {
  max-width: 60ch;
  font-size: clamp(16px, 1.15vw, 18px);
  line-height: 1.75;
  color: rgba(255, 255, 255, 0.86);
  margin: 0 0 clamp(24px, 3vw, 36px);
}

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

.page-about .about-hero__panel {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--about-hair);
  border: 1px solid var(--about-hair);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 34px), calc(100% - 34px) 100%, 0 100%);
}

.page-about .about-hero__panel-cell {
  background: var(--navy);
  padding: clamp(18px, 2.2vw, 26px);
  display: flex;
  flex-direction: column;
  gap: 10px;
  min-height: 132px;
}

.page-about .about-hero__panel-cell--slim {
  background: var(--navy-2);
  min-height: 0;
  flex-direction: row;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 14px clamp(16px, 2vw, 24px);
}

.page-about .about-hero__big {
  display: block;
  font-family: var(--font-data);
  font-size: clamp(46px, 7vw, 78px);
  line-height: 0.9;
  letter-spacing: -0.03em;
  color: var(--orange);
  font-variant-numeric: tabular-nums;
}

.page-about .about-hero__big-label {
  font-size: 13px;
  line-height: 1.55;
  color: var(--mist);
}

.page-about .about-hero__slim-label {
  font-size: 12px;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--mist);
}

.page-about .about-hero__slim-value {
  font-family: var(--font-data);
  font-size: 18px;
  color: var(--cyan);
  font-variant-numeric: tabular-nums;
}

/* ---------- 我们做什么 ---------- */

.page-about .about-what__head {
  max-width: 720px;
  margin-bottom: clamp(34px, 5vw, 60px);
}

.page-about .about-what__head .t-d2 {
  margin: 12px 0 0;
}

.page-about .about-what__cols {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(28px, 4vw, 56px);
  border-top: 1px solid var(--about-hair);
  padding-top: clamp(28px, 4vw, 48px);
}

.page-about .about-what__col {
  position: relative;
  padding-left: 0;
}

.page-about .about-what__index {
  display: block;
  font-family: var(--font-data);
  font-size: 13px;
  letter-spacing: 0.16em;
  color: var(--orange);
  margin-bottom: 14px;
}

.page-about .about-what__col .t-d3 {
  margin: 0 0 14px;
}

.page-about .about-what__body {
  color: rgba(255, 255, 255, 0.78);
  font-size: 16px;
  line-height: 1.78;
  margin: 0;
  max-width: 62ch;
}

/* ---------- 服务范围与覆盖 ---------- */

.page-about .about-reach {
  border-bottom: 1px solid var(--paper-line);
}

.page-about .about-reach__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(32px, 4.5vw, 64px);
  align-items: start;
}

.page-about .about-reach__lede {
  max-width: 56ch;
  font-size: 17px;
  line-height: 1.78;
  color: var(--paper-text);
  margin: 16px 0 0;
}

.page-about .about-reach__facts {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1px;
  margin: clamp(26px, 3.4vw, 40px) 0 0;
  background: var(--paper-line);
  border: 1px solid var(--paper-line);
}

.page-about .about-reach__facts > div {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: 16px;
  padding: 14px 18px;
  background: var(--paper);
}

.page-about .about-reach__facts dt {
  font-size: 14px;
  color: var(--paper-text);
  margin: 0;
}

.page-about .about-reach__facts dd {
  margin: 0;
  font-weight: 600;
  font-size: 15px;
  color: var(--ink);
  text-align: right;
}

.page-about .about-reach__facts dd .num {
  font-family: var(--font-data);
  font-size: 19px;
  color: var(--orange);
  font-variant-numeric: tabular-nums;
  margin-right: 2px;
}

.page-about .about-reach__figure {
  margin: 0;
  border: 1px solid var(--paper-line);
  background: var(--ink);
  position: relative;
  overflow: hidden;
}

.page-about .about-reach__figure::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(155deg, rgba(0, 229, 255, 0.14) 0%, rgba(10, 31, 68, 0) 55%);
  pointer-events: none;
}

.page-about .about-reach__figure img {
  display: block;
  width: 100%;
  height: auto;
  max-width: 100%;
  object-fit: cover;
  transition: transform 420ms ease;
}

.page-about .about-reach__figure:hover img {
  transform: scale(1.03);
}

.page-about .about-reach__figure .media__cap {
  position: relative;
  z-index: 1;
  padding: 12px 16px;
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--mist);
  background: var(--ink);
  border-top: 1px solid var(--about-hair);
}

/* ---------- 数据与内容能力 ---------- */

.page-about .about-capability {
  position: relative;
}

.page-about .about-capability__head {
  max-width: 720px;
  margin-bottom: clamp(30px, 4vw, 52px);
}

.page-about .about-capability__lede {
  margin: 16px 0 0;
  max-width: 62ch;
  font-size: 17px;
  line-height: 1.78;
  color: rgba(255, 255, 255, 0.78);
}

.page-about .about-capability__figure {
  margin: 0 0 clamp(30px, 4vw, 52px);
  border: 1px solid var(--about-hair);
  overflow: hidden;
}

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

.page-about .about-capability__figure .media__cap {
  padding: 12px 16px;
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--mist);
  border-top: 1px solid var(--about-hair);
  background: var(--ink);
}

.page-about .about-capability__matrix {
  border-top: 1px solid var(--about-hair);
}

.page-about .about-capability__row {
  display: grid;
  grid-template-columns: 1fr;
  gap: 6px;
  padding: 16px 0;
  border-bottom: 1px solid var(--about-hair);
  font-size: 15px;
  line-height: 1.65;
  color: rgba(255, 255, 255, 0.82);
}

.page-about .about-capability__row--head {
  display: none;
}

.page-about .about-capability__key {
  font-family: var(--font-display);
  font-size: 17px;
  letter-spacing: 0.02em;
  color: var(--orange);
}

.page-about .about-capability__row .num {
  font-family: var(--font-data);
  font-size: 14px;
  color: var(--cyan);
  font-variant-numeric: tabular-nums;
}

/* ---------- 版本演进时间线 ---------- */

.page-about .about-timeline {
  position: relative;
  border-top: 1px solid var(--about-hair);
}

.page-about .about-timeline__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(34px, 4.5vw, 64px);
  align-items: start;
}

.page-about .about-timeline__note {
  margin: 16px 0 0;
  max-width: 46ch;
  font-size: 16px;
  line-height: 1.78;
  color: rgba(255, 255, 255, 0.74);
}

.page-about .about-timeline__art {
  margin: clamp(24px, 3vw, 36px) 0 0;
  border: 1px solid var(--about-hair);
  background: var(--navy);
  overflow: hidden;
}

.page-about .about-timeline__art img {
  display: block;
  width: 100%;
  height: auto;
  max-width: 100%;
  object-fit: cover;
  opacity: 0.92;
}

.page-about .about-timeline__list {
  list-style: none;
  margin: 0;
  padding: 0 0 0 26px;
  border-left: 1px solid var(--about-hair);
  display: grid;
  gap: clamp(26px, 3.4vw, 44px);
}

.page-about .about-timeline__node {
  position: relative;
  padding-left: 4px;
}

.page-about .about-timeline__dot {
  position: absolute;
  left: -32px;
  top: 8px;
  width: 11px;
  height: 11px;
  background: var(--navy-2);
  border: 1px solid var(--hairline);
  box-shadow: 0 0 0 4px rgba(10, 31, 68, 0.9);
  transition: background 240ms ease, border-color 240ms ease, box-shadow 240ms ease;
}

.page-about .about-timeline__node--current .about-timeline__dot {
  background: var(--orange);
  border-color: var(--orange);
  box-shadow: 0 0 0 4px rgba(255, 107, 53, 0.18);
}

.page-about .about-timeline__era {
  margin: 0 0 8px;
  font-family: var(--font-data);
  font-size: 12px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--cyan);
}

.page-about .about-timeline__node--current .about-timeline__era {
  color: var(--orange);
}

.page-about .about-timeline__node .t-d3 {
  margin: 0 0 12px;
}

.page-about .about-timeline__node p:last-child {
  margin: 0;
  max-width: 54ch;
  font-size: 15px;
  line-height: 1.78;
  color: rgba(255, 255, 255, 0.74);
}

/* ---------- 团队与分工 ---------- */

.page-about .about-team__head {
  max-width: 720px;
  margin-bottom: clamp(30px, 4vw, 52px);
}

.page-about .about-team__lede {
  margin: 16px 0 0;
  max-width: 58ch;
  font-size: 17px;
  line-height: 1.78;
  color: var(--paper-text);
}

.page-about .about-team__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1px;
  background: var(--paper-line);
  border: 1px solid var(--paper-line);
}

.page-about .about-team__card {
  background: var(--paper);
  padding: clamp(22px, 2.6vw, 30px);
  transition: background 220ms ease, transform 220ms ease, box-shadow 220ms ease;
}

.page-about .about-team__card:hover {
  background: var(--white);
  transform: translateY(-4px);
  box-shadow: inset 0 0 0 1px var(--cyan);
}

.page-about .about-team__role {
  margin: 0 0 12px;
  font-family: var(--font-data);
  font-size: 12px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--orange);
}

.page-about .about-team__card .t-d3 {
  margin: 0 0 12px;
  font-size: clamp(20px, 1.6vw, 24px);
}

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

/* ---------- 运营主体与备案 ---------- */

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

.page-about .about-entity__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(28px, 4vw, 56px);
  align-items: start;
}

.page-about .about-entity__copy p {
  margin: 16px 0 0;
  max-width: 52ch;
  font-size: 16px;
  line-height: 1.78;
  color: rgba(255, 255, 255, 0.76);
}

.page-about .about-entity__list {
  margin: 0;
  display: grid;
  gap: 1px;
  background: var(--about-hair);
  border: 1px solid var(--about-hair);
}

.page-about .about-entity__list > div {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: 18px;
  padding: 16px 18px;
  background: var(--navy);
}

.page-about .about-entity__list dt {
  margin: 0;
  font-size: 13px;
  letter-spacing: 0.04em;
  color: var(--mist);
}

.page-about .about-entity__list dd {
  margin: 0;
  font-size: 15px;
  color: var(--white);
  text-align: right;
}

.page-about .about-entity__list dd.num {
  font-family: var(--font-data);
  color: var(--cyan);
  font-variant-numeric: tabular-nums;
  letter-spacing: 0.02em;
}

/* ---------- 一起做事的方式 ---------- */

.page-about .about-collab {
  position: relative;
}

.page-about .about-collab__head {
  max-width: 720px;
  margin-bottom: clamp(30px, 4vw, 52px);
}

.page-about .about-collab__lede {
  margin: 16px 0 0;
  max-width: 60ch;
  font-size: 17px;
  line-height: 1.78;
  color: rgba(255, 255, 255, 0.78);
}

.page-about .about-collab__cols {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(24px, 3vw, 40px);
  border-top: 1px solid var(--about-hair);
  padding-top: clamp(26px, 3.4vw, 44px);
}

.page-about .about-collab__col .t-d3 {
  margin: 0 0 12px;
  font-size: clamp(19px, 1.5vw, 23px);
}

.page-about .about-collab__col p {
  margin: 0;
  max-width: 46ch;
  font-size: 15px;
  line-height: 1.78;
  color: rgba(255, 255, 255, 0.74);
}

.page-about .about-collab__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: clamp(30px, 4vw, 48px);
}

/* ---------- 响应式 ---------- */

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

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

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

@media (min-width: 900px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 1.6fr) minmax(300px, 0.8fr);
  }

  .page-about .about-hero__title br {
    display: block;
  }

  .page-about .about-what__cols {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: clamp(40px, 5vw, 76px);
  }

  .page-about .about-reach__grid {
    grid-template-columns: minmax(0, 1fr) minmax(0, 0.92fr);
  }

  .page-about .about-capability__row {
    grid-template-columns: minmax(0, 0.62fr) minmax(0, 0.82fr) minmax(0, 1.85fr);
    gap: 20px;
    align-items: baseline;
    padding: 18px 0;
  }

  .page-about .about-capability__row--head {
    display: grid;
    padding: 12px 0;
    font-family: var(--font-data);
    font-size: 12px;
    letter-spacing: 0.14em;
    text-transform: uppercase;
    color: var(--mist);
    border-bottom: 1px solid var(--about-hair);
  }

  .page-about .about-reach__facts {
    grid-template-columns: 1fr;
  }

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

  .page-about .about-collab__cols {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: clamp(28px, 3vw, 52px);
  }
}

@media (min-width: 1000px) {
  .page-about .about-timeline__grid {
    grid-template-columns: minmax(0, 0.88fr) minmax(0, 1.12fr);
  }

  .page-about .about-timeline__side {
    position: sticky;
    top: calc(var(--head-h) + 28px);
  }

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

@media (max-width: 420px) {
  .page-about .about-hero__panel {
    grid-template-columns: 1fr;
  }

  .page-about .about-reach__facts > div,
  .page-about .about-entity__list > div {
    flex-direction: column;
    align-items: flex-start;
    gap: 6px;
  }

  .page-about .about-reach__facts dd,
  .page-about .about-entity__list dd {
    text-align: left;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-reach__figure img,
  .page-about .about-team__card,
  .page-about .about-timeline__dot {
    transition: none;
  }

  .page-about .about-reach__figure:hover img {
    transform: none;
  }

  .page-about .about-team__card:hover {
    transform: none;
    box-shadow: inset 0 0 0 1px var(--cyan);
  }
}