.page-about {
  --about-rail: rgba(241, 238, 228, .14);
  --about-rail-lit: rgba(53, 240, 200, .55);
  --about-hair: rgba(241, 238, 228, .1);
}

/* ---------- 面包屑 ---------- */
.page-about .about-crumb {
  padding-top: calc(var(--header-h) + 14px);
}

/* ---------- 开场 ---------- */
.page-about .about-open {
  padding-top: clamp(30px, 4vw, 56px);
}

.page-about .about-open__grid {
  display: grid;
  gap: 44px;
}

.page-about .about-open__lead h1 {
  margin: 12px 0 20px;
}

.page-about .about-open__facts {
  border-top: 1px solid var(--about-hair);
  padding-top: 20px;
}

.page-about .about-facts {
  margin: 0;
  display: grid;
  gap: 16px;
}

.page-about .about-facts__item {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 18px;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--about-hair);
}

.page-about .about-facts dt {
  font-size: 14px;
  color: var(--text-mute);
  letter-spacing: .05em;
}

.page-about .about-facts dd {
  margin: 0;
  font-size: 27px;
  font-weight: 700;
  line-height: 1;
  color: var(--cyan);
  letter-spacing: -.02em;
}

.page-about .about-facts dd span {
  margin-left: 4px;
  font-size: 13px;
  font-weight: 400;
  color: var(--text-mute);
  letter-spacing: 0;
}

/* ---------- 起点 ---------- */
.page-about .about-origin__grid {
  display: grid;
  gap: 28px;
}

.page-about .about-origin__year {
  font-family: var(--font-mono);
  font-size: clamp(54px, 9vw, 108px);
  font-weight: 700;
  line-height: .9;
  letter-spacing: -.04em;
  color: rgba(53, 240, 200, .22);
}

.page-about .about-origin__body h2 {
  margin: 12px 0 20px;
}

.page-about .about-origin__body p {
  margin: 0 0 1.1em;
  max-width: 62ch;
  font-size: 16px;
  line-height: 1.9;
  color: var(--text-soft);
}

.page-about .about-origin__body p:last-child {
  margin-bottom: 0;
}

/* ---------- 团队 ---------- */
.page-about .about-team__head {
  max-width: 720px;
}

.page-about .about-team__head .lede {
  margin-top: 16px;
}

.page-about .about-team__grid {
  display: grid;
  gap: 22px;
  margin-top: 52px;
}

.page-about .about-team__card {
  position: relative;
  padding: 30px 26px 34px;
  border-radius: var(--radius-card);
  border: 1px solid var(--about-hair);
  transition: opacity .3s ease, transform .3s ease;
}

.page-about .about-team__card--a {
  background: linear-gradient(158deg, rgba(47, 93, 75, .52) 0%, rgba(12, 42, 36, .94) 64%);
}

.page-about .about-team__card--b {
  background: linear-gradient(158deg, rgba(181, 98, 60, .44) 0%, rgba(12, 42, 36, .95) 64%);
}

.page-about .about-team__card--c {
  background: linear-gradient(158deg, rgba(74, 107, 96, .5) 0%, rgba(12, 42, 36, .94) 64%);
}

.page-about .about-team__num {
  margin: 0;
  font-size: 52px;
  font-weight: 700;
  line-height: 1;
  letter-spacing: -.03em;
  color: var(--cyan);
}

.page-about .about-team__role {
  margin: 10px 0 12px;
  font-size: 19px;
  font-weight: 700;
  color: var(--bone);
}

.page-about .about-team__card p:last-child {
  margin: 0;
  font-size: 15.5px;
  line-height: 1.85;
  color: var(--text-soft);
}

.page-about .about-team__figure {
  margin: 52px 0 0;
}

/* ---------- 四个环节 ---------- */
.page-about .about-flow__grid {
  display: grid;
  gap: 40px;
}

.page-about .about-flow__head .lede {
  margin-top: 16px;
}

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

.page-about .about-flow__step {
  display: grid;
  grid-template-columns: 52px minmax(0, 1fr);
  gap: 18px;
  padding: 24px 0;
  border-top: 1px solid var(--about-hair);
}

.page-about .about-flow__step:last-child {
  border-bottom: 1px solid var(--about-hair);
}

.page-about .about-flow__idx {
  padding-top: 3px;
  font-size: 14px;
  letter-spacing: .08em;
  color: var(--cyan-dim);
}

.page-about .about-flow__name {
  margin: 0 0 6px;
  font-size: 17px;
  font-weight: 700;
  color: var(--bone);
}

.page-about .about-flow__step p {
  margin: 0;
  font-size: 15.5px;
  line-height: 1.85;
  color: var(--text-soft);
}

/* ---------- 时间轴 ---------- */
.page-about .about-timeline__head {
  max-width: 660px;
}

.page-about .about-timeline__list {
  position: relative;
  list-style: none;
  margin: 44px 0 0;
  padding: 0;
}

.page-about .about-timeline__list::before {
  content: "";
  position: absolute;
  left: 5px;
  top: 10px;
  bottom: 10px;
  width: 1px;
  background: linear-gradient(180deg, var(--about-rail) 0%, rgba(53, 240, 200, .38) 45%, var(--about-rail) 100%);
}

.page-about .about-timeline__item {
  position: relative;
  padding: 0 0 36px 30px;
}

.page-about .about-timeline__item::before {
  content: "";
  position: absolute;
  left: 0;
  top: 8px;
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--ink);
  border: 1px solid var(--about-rail-lit);
  box-shadow: 0 0 0 4px rgba(53, 240, 200, .06);
}

.page-about .about-timeline__year {
  margin: 0 0 4px;
  font-size: 15px;
  letter-spacing: .12em;
  color: var(--cyan);
}

.page-about .about-timeline__title {
  margin: 0 0 8px;
  font-size: 20px;
  font-weight: 700;
  color: var(--bone);
}

.page-about .about-timeline__text {
  margin: 0;
  max-width: 56ch;
  font-size: 15.5px;
  line-height: 1.85;
  color: var(--text-soft);
}

.page-about .about-timeline__figure {
  margin: 28px 0 0;
}

/* ---------- 使用场景 ---------- */
.page-about .about-uses__grid {
  display: grid;
  gap: 40px;
}

.page-about .about-uses__intro .lede {
  margin-top: 16px;
}

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

.page-about .about-uses__item {
  padding: 26px 0;
  border-top: 1px solid var(--about-hair);
}

.page-about .about-uses__item:last-child {
  border-bottom: 1px solid var(--about-hair);
}

.page-about .about-uses__tag {
  display: inline-block;
  margin-bottom: 12px;
  padding: 3px 12px;
  font-size: 12px;
  letter-spacing: .14em;
  color: var(--orange);
  border: 1px solid rgba(255, 122, 61, .35);
  border-radius: 999px;
}

.page-about .about-uses__name {
  margin: 0 0 8px;
  font-size: 19px;
  font-weight: 700;
  color: var(--bone);
}

.page-about .about-uses__item p {
  margin: 0;
  font-size: 15.5px;
  line-height: 1.85;
  color: var(--text-soft);
}

/* ---------- 合作生态 ---------- */
.page-about .about-partners__panel {
  position: relative;
  overflow: hidden;
  border-radius: var(--radius-card);
  border: 1px solid var(--about-hair);
  background: var(--ink-2);
}

.page-about .about-partners__bg {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: .2;
}

.page-about .about-partners__inner {
  position: relative;
  padding: clamp(30px, 5vw, 64px);
  background: linear-gradient(200deg, rgba(7, 21, 18, .55) 0%, rgba(7, 21, 18, .95) 72%);
}

.page-about .about-partners__inner h2 {
  margin: 12px 0 18px;
}

.page-about .about-partners__text {
  margin: 0;
  max-width: 74ch;
  font-size: 16px;
  line-height: 1.9;
  color: var(--text-soft);
}

.page-about .about-partners__stats {
  display: grid;
  gap: 26px;
  margin-top: 40px;
}

.page-about .about-partners__stat {
  padding-top: 16px;
  border-top: 1px solid var(--line-cyan);
}

.page-about .about-partners__stat .mono {
  display: block;
  font-size: 44px;
  font-weight: 700;
  line-height: 1;
  letter-spacing: -.03em;
  color: var(--cyan);
}

.page-about .about-partners__stat p {
  margin: 12px 0 0;
  font-size: 14.5px;
  line-height: 1.75;
  color: var(--text-soft);
}

/* ---------- 能力旁证 ---------- */
.page-about .about-proof__head {
  max-width: 620px;
}

.page-about .about-proof__grid {
  display: grid;
  gap: 18px;
  margin-top: 40px;
}

.page-about .about-proof__grid .metric-card__value {
  font-family: var(--font-mono);
  letter-spacing: -.02em;
}

.page-about .about-proof__grid .metric-card__value span {
  font-size: 15px;
  font-weight: 400;
  letter-spacing: 0;
}

/* ---------- 收束 ---------- */
.page-about .about-cta__inner {
  max-width: 740px;
}

.page-about .about-cta__inner h2 {
  margin: 12px 0 18px;
}

.page-about .about-cta__inner p {
  margin: 0;
  font-size: 16px;
  line-height: 1.9;
  color: var(--ink-text-soft);
}

.page-about .about-cta__actions {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 20px;
  margin-top: 30px;
}

.page-about .about-cta__link {
  padding-bottom: 3px;
  font-size: 15px;
  color: var(--ink);
  text-decoration: none;
  border-bottom: 1px solid rgba(7, 21, 18, .32);
  transition: border-color .2s ease;
}

.page-about .about-cta__link:hover,
.page-about .about-cta__link:focus-visible {
  border-bottom-color: var(--ink);
}

/* ---------- 桌面端 ---------- */
@media (min-width: 640px) {
  .page-about .about-proof__grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .page-about .about-partners__stats {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 32px;
  }
}

@media (min-width: 768px) {
  .page-about .about-team__grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (min-width: 900px) {
  .page-about .about-open__grid {
    grid-template-columns: minmax(0, 1.35fr) minmax(0, .8fr);
    gap: clamp(48px, 6vw, 96px);
    align-items: end;
  }

  .page-about .about-origin__grid {
    grid-template-columns: minmax(0, 3fr) minmax(0, 7fr);
    gap: 56px;
    align-items: start;
  }

  .page-about .about-origin__year {
    position: sticky;
    top: calc(var(--header-h) + 40px);
  }

  .page-about .about-origin__body {
    padding-left: 44px;
    border-left: 1px solid var(--about-hair);
  }

  .page-about .about-team__figure {
    width: min(760px, 68%);
    margin: 72px 0 0 auto;
  }

  .page-about .about-flow__grid {
    grid-template-columns: minmax(0, 4fr) minmax(0, 8fr);
    gap: 72px;
    align-items: start;
  }

  .page-about .about-timeline__list {
    margin-top: 60px;
  }

  .page-about .about-timeline__list::before {
    left: 5px;
  }

  .page-about .about-timeline__item {
    display: grid;
    grid-template-columns: 92px minmax(0, 1fr);
    column-gap: 40px;
    padding: 0 0 46px 40px;
    align-items: start;
  }

  .page-about .about-timeline__item::before {
    top: 10px;
  }

  .page-about .about-timeline__year {
    grid-column: 1;
    grid-row: 1;
    margin: 0;
    padding-top: 2px;
    text-align: right;
  }

  .page-about .about-timeline__title {
    grid-column: 2;
    grid-row: 1;
  }

  .page-about .about-timeline__text {
    grid-column: 2;
    grid-row: 2;
  }

  .page-about .about-timeline__item:nth-child(odd) .about-timeline__text {
    max-width: 38ch;
  }

  .page-about .about-timeline__item:nth-child(even) .about-timeline__text {
    max-width: 50ch;
  }

  .page-about .about-timeline__figure {
    width: min(640px, 60%);
    margin: 10px 0 0 auto;
  }

  .page-about .about-uses__grid {
    grid-template-columns: minmax(0, 5fr) minmax(0, 7fr);
    gap: 76px;
    align-items: start;
  }
}

@media (min-width: 1100px) {
  .page-about .about-team__grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 26px;
    align-items: start;
  }

  .page-about .about-team__card--b {
    margin-top: 46px;
  }

  .page-about .about-team__card--c {
    margin-top: 92px;
  }

  .page-about .about-team__grid:hover .about-team__card {
    opacity: .5;
  }

  .page-about .about-team__grid:hover .about-team__card:hover {
    opacity: 1;
    transform: translateY(-6px);
  }

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

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

  .page-about .about-team__grid:hover .about-team__card:hover {
    transform: none;
  }
}