.page-about {
  background: var(--navy-800);
  color: var(--mist);
  overflow-x: hidden;
  padding-bottom: clamp(40px, 7vw, 90px);
}

/* ---------- 面包屑 ---------- */
.page-about .about-crumb {
  padding-top: clamp(16px, 3vw, 28px);
}

.page-about .breadcrumb {
  font-size: 13px;
  letter-spacing: .04em;
  color: var(--stone);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  padding-top: clamp(22px, 3.4vw, 40px);
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  top: -6%;
  left: -12%;
  width: min(58vw, 520px);
  aspect-ratio: 1 / 1;
  background: radial-gradient(circle at 38% 34%, rgba(25, 227, 198, .20), transparent 66%);
  border-radius: 44% 56% 62% 38% / 54% 42% 58% 46%;
  pointer-events: none;
  z-index: 0;
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  right: -10%;
  bottom: -22%;
  width: min(42vw, 340px);
  aspect-ratio: 1 / 1;
  background: radial-gradient(circle at 60% 40%, rgba(255, 106, 19, .16), transparent 68%);
  border-radius: 60% 40% 44% 56% / 42% 58% 42% 58%;
  pointer-events: none;
  z-index: 0;
}

.page-about .about-hero__grid {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(24px, 4vw, 48px);
  align-items: end;
}

.page-about .about-hero__eyebrow {
  margin: 0 0 14px;
  font-family: var(--font-num);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: .22em;
  text-transform: uppercase;
  color: var(--cyan);
}

.page-about .about-hero__title {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(36px, 8vw, 76px);
  line-height: 1.03;
  letter-spacing: -.02em;
  color: var(--mist);
}

.page-about .about-hero__lede {
  margin: clamp(16px, 2.4vw, 24px) 0 0;
  max-width: 62ch;
  font-size: clamp(15px, 1.6vw, 17px);
  line-height: 1.78;
  color: var(--stone);
}

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

.page-about .about-hero__aside {
  position: relative;
  background: linear-gradient(158deg, var(--steel) 0%, var(--navy-900) 76%);
  border: 1px solid var(--line-strong);
  clip-path: polygon(0 0, 100% 0, 100% 84%, 84% 100%, 0 100%);
  padding: clamp(20px, 3vw, 30px) clamp(20px, 3vw, 30px) clamp(30px, 4vw, 44px);
}

.page-about .about-hero__aside-label {
  margin: 0;
  font-size: 12px;
  letter-spacing: .16em;
  color: var(--stone);
}

.page-about .about-hero__aside-year {
  margin: 4px 0 clamp(14px, 2vw, 20px);
  font-family: var(--font-num);
  font-weight: 700;
  font-size: clamp(40px, 6vw, 58px);
  line-height: 1;
  color: var(--orange);
  font-variant-numeric: tabular-nums;
}

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

.page-about .about-hero__aside-list li {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 12px;
  padding-top: 10px;
  border-top: 1px solid var(--line);
  font-size: 13.5px;
  color: var(--stone);
}

.page-about .about-hero__aside-list strong {
  font-family: var(--font-num);
  font-size: 15px;
  color: var(--mist);
  font-variant-numeric: tabular-nums;
  white-space: nowrap;
}

/* ---------- 数字面板 ---------- */
.page-about .about-metrics {
  position: relative;
  margin-top: clamp(38px, 6vw, 82px);
  background: var(--navy-900);
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  overflow: hidden;
}

.page-about .about-metrics__bg {
  position: absolute;
  inset: 0;
  z-index: 0;
}

.page-about .about-metrics__bg img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: .2;
  max-width: 100%;
}

.page-about .about-metrics__bg::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(118deg, rgba(6, 18, 38, .95) 14%, rgba(10, 27, 51, .76) 52%, rgba(21, 58, 102, .58) 100%);
}

.page-about .about-metrics__inner {
  position: relative;
  z-index: 1;
  padding-top: clamp(34px, 5vw, 62px);
  padding-bottom: clamp(34px, 5vw, 62px);
}

.page-about .about-metrics__head .section-head__title {
  color: var(--mist);
}

.page-about .about-metrics__grid {
  list-style: none;
  margin: clamp(22px, 3.4vw, 36px) 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: clamp(12px, 2vw, 22px);
}

.page-about .about-metric {
  background: rgba(10, 27, 51, .74);
  border: 1px solid var(--line);
  padding: clamp(16px, 2.4vw, 26px);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 20px), calc(100% - 20px) 100%, 0 100%);
  transition: transform .35s var(--ease), border-color .35s var(--ease);
}

.page-about .about-metric:hover {
  transform: translateY(-2px);
  border-color: var(--cyan);
}

.page-about .about-metric__num {
  margin: 0;
  font-family: var(--font-num);
  font-weight: 700;
  font-size: clamp(28px, 4.6vw, 46px);
  line-height: 1;
  color: var(--mist);
  font-variant-numeric: tabular-nums;
}

.page-about .about-metric__num span {
  font-size: .5em;
  margin-left: 3px;
  color: var(--stone);
}

.page-about .about-metric--accent .about-metric__num {
  color: var(--orange);
}

.page-about .about-metric--cyan .about-metric__num {
  color: var(--cyan);
}

.page-about .about-metric__label {
  margin: 10px 0 0;
  font-size: 13px;
  line-height: 1.6;
  color: var(--stone);
}

/* ---------- 内容生产线 ---------- */
.page-about .about-prod {
  padding-top: clamp(46px, 7vw, 96px);
}

.page-about .about-prod__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(28px, 4.4vw, 56px);
  align-items: start;
}

.page-about .about-prod__title {
  margin: 8px 0 0;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(26px, 4.4vw, 44px);
  line-height: 1.14;
  letter-spacing: -.01em;
}

.page-about .about-prod__lede {
  margin: 16px 0 0;
  max-width: 60ch;
  font-size: 16px;
  line-height: 1.78;
  color: var(--stone);
}

.page-about .about-prod__steps {
  list-style: none;
  margin: clamp(22px, 3vw, 34px) 0 0;
  padding: 0;
  display: grid;
  gap: 2px;
  counter-reset: prodstep;
}

.page-about .about-prod__step {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: clamp(14px, 2vw, 22px);
  padding: clamp(14px, 2vw, 20px) 0;
  border-top: 1px solid var(--line);
}

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

.page-about .about-prod__step-no {
  font-family: var(--font-num);
  font-size: 13px;
  font-weight: 700;
  letter-spacing: .08em;
  color: var(--amber);
  padding-top: 3px;
}

.page-about .about-prod__step-title {
  margin: 0;
  font-family: var(--font-display);
  font-size: 17px;
  font-weight: 900;
  color: var(--mist);
}

.page-about .about-prod__step p {
  margin: 6px 0 0;
  font-size: 14.5px;
  line-height: 1.72;
  color: var(--stone);
}

.page-about .about-prod__stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: clamp(12px, 2vw, 20px);
  margin-top: clamp(22px, 3vw, 32px);
}

.page-about .about-prod__stat {
  background: linear-gradient(150deg, var(--steel) 0%, var(--navy-900) 88%);
  border-left: 3px solid var(--orange);
  padding: clamp(14px, 2vw, 20px);
}

.page-about .about-prod__stat-num {
  margin: 0;
  font-family: var(--font-num);
  font-weight: 700;
  font-size: clamp(24px, 3.6vw, 34px);
  line-height: 1;
  color: var(--mist);
  font-variant-numeric: tabular-nums;
}

.page-about .about-prod__stat-num span {
  font-size: .5em;
  margin-left: 3px;
  color: var(--amber);
}

.page-about .about-prod__stat-label {
  margin: 8px 0 0;
  font-size: 13px;
  color: var(--stone);
}

.page-about .about-prod__link {
  margin: 22px 0 0;
  font-size: 15px;
}

.page-about .about-prod__link a {
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(25, 227, 198, .38);
  padding-bottom: 2px;
}

.page-about .about-prod__link a:hover {
  color: var(--amber);
  border-bottom-color: var(--amber);
}

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

/* ---------- 版本沿革 ---------- */
.page-about .about-tl-sec {
  padding-top: clamp(46px, 7vw, 96px);
}

.page-about .about-tl__head .section-head__title {
  color: var(--mist);
}

.page-about .about-tl {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(26px, 4vw, 52px);
  margin-top: clamp(24px, 3.6vw, 40px);
}

.page-about .about-tl__list {
  list-style: none;
  position: relative;
  margin: 0;
  padding: 0 0 0 30px;
}

.page-about .about-tl__list::before {
  content: "";
  position: absolute;
  left: 7px;
  top: 8px;
  bottom: 8px;
  width: 2px;
  border-radius: var(--r-pill);
  background: linear-gradient(180deg, var(--orange) 0%, var(--amber) 34%, var(--cyan) 70%, var(--steel-2) 100%);
}

.page-about .about-tl__item {
  position: relative;
  padding-bottom: clamp(20px, 3vw, 32px);
}

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

.page-about .about-tl__mark {
  position: absolute;
  left: -30px;
  top: 4px;
  width: 16px;
  height: 16px;
  background: var(--navy-800);
  border: 2px solid var(--amber);
  border-radius: var(--r-xs);
  transform: rotate(45deg);
  transition: transform .35s var(--ease), border-color .35s var(--ease), background-color .35s var(--ease);
}

.page-about .about-tl__item:nth-child(2) .about-tl__mark {
  border-radius: var(--r-pill);
  transform: none;
  border-color: var(--cyan);
}

.page-about .about-tl__item:nth-child(3) .about-tl__mark {
  border-radius: 2px;
  transform: none;
  border-color: var(--green);
}

.page-about .about-tl__item:nth-child(4) .about-tl__mark {
  border-radius: 50% 50% 50% 0;
  border-color: var(--gold);
}

.page-about .about-tl__item--current .about-tl__mark {
  background: var(--orange);
  border-color: var(--orange);
  border-radius: var(--r-pill);
  transform: none;
  box-shadow: 0 0 0 5px rgba(255, 106, 19, .18);
}

.page-about .about-tl__item:hover .about-tl__mark {
  transform: translateY(-2px) rotate(45deg);
}

.page-about .about-tl__item--current:hover .about-tl__mark {
  transform: translateY(-2px);
}

.page-about .about-tl__stage {
  margin: 0;
  font-family: var(--font-num);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: .14em;
  text-transform: uppercase;
  color: var(--amber);
}

.page-about .about-tl__title {
  margin: 6px 0 0;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(19px, 2.6vw, 24px);
  line-height: 1.28;
  color: var(--mist);
}

.page-about .about-tl__desc {
  margin: 8px 0 0;
  max-width: 58ch;
  font-size: 15px;
  line-height: 1.76;
  color: var(--stone);
}

.page-about .about-tl__more {
  overflow: hidden;
}

.page-about .about-tl__more p {
  margin: 10px 0 0;
  padding-left: 14px;
  border-left: 2px solid var(--line-strong);
  max-width: 56ch;
  font-size: 14px;
  line-height: 1.74;
  color: var(--stone-deep);
}

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

/* ---------- 团队与分工 ---------- */
.page-about .about-team-sec {
  padding-top: clamp(46px, 7vw, 96px);
}

.page-about .about-team__head .section-head__title {
  color: var(--mist);
}

.page-about .about-team__filter {
  margin-top: clamp(20px, 3vw, 30px);
}

.page-about .about-team__grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: clamp(16px, 2.6vw, 28px);
  margin-top: clamp(20px, 3vw, 32px);
}

.page-about .about-team__card {
  background: linear-gradient(158deg, var(--steel) 0%, var(--navy-900) 92%);
  border: 1px solid var(--line);
  padding: clamp(20px, 2.8vw, 28px);
  transition: transform .35s var(--ease), border-color .35s var(--ease), box-shadow .35s var(--ease);
}

.page-about .about-team__card:hover {
  transform: translateY(-2px);
  border-color: var(--cyan);
  box-shadow: var(--shadow-1);
}

.page-about .about-team__count {
  margin: 0 0 12px;
  font-family: var(--font-num);
  font-weight: 700;
  font-size: clamp(30px, 4.2vw, 42px);
  line-height: 1;
  color: var(--cyan);
  font-variant-numeric: tabular-nums;
}

.page-about .about-team__count span {
  font-size: .46em;
  margin-left: 3px;
  color: var(--stone);
}

.page-about .about-team__card .card__title {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: 21px;
  color: var(--mist);
}

.page-about .about-team__card .card__meta {
  margin: 6px 0 0;
  font-size: 13px;
  color: var(--amber);
}

.page-about .about-team__duties {
  list-style: none;
  margin: 16px 0 0;
  padding: 14px 0 0;
  border-top: 1px solid var(--line);
  display: grid;
  gap: 9px;
}

.page-about .about-team__duties li {
  position: relative;
  padding-left: 15px;
  font-size: 14px;
  line-height: 1.7;
  color: var(--stone);
}

.page-about .about-team__duties li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 9px;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--orange);
}

/* ---------- 合作生态 ---------- */
.page-about .about-eco {
  padding-top: clamp(46px, 7vw, 96px);
}

.page-about .about-eco__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(26px, 4vw, 52px);
  align-items: start;
}

.page-about .about-eco__title {
  margin: 8px 0 0;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(25px, 4.2vw, 42px);
  line-height: 1.16;
  letter-spacing: -.01em;
}

.page-about .about-eco__lede {
  margin: 16px 0 24px;
  max-width: 50ch;
  font-size: 16px;
  line-height: 1.78;
  color: var(--stone);
}

.page-about .about-eco__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: clamp(12px, 2vw, 18px);
}

.page-about .about-eco__item {
  position: relative;
  background: rgba(21, 58, 102, .42);
  border-left: 3px solid var(--cyan);
  padding: clamp(16px, 2.4vw, 24px);
  border-radius: 0 var(--r-md) var(--r-md) 0;
}

.page-about .about-eco__item:nth-child(2) {
  border-left-color: var(--amber);
  margin-left: clamp(0px, 3vw, 26px);
}

.page-about .about-eco__item:nth-child(3) {
  border-left-color: var(--gold);
  margin-left: clamp(0px, 6vw, 52px);
}

.page-about .about-eco__item-num {
  margin: 0;
  font-family: var(--font-num);
  font-weight: 700;
  font-size: 26px;
  line-height: 1;
  color: var(--mist);
  font-variant-numeric: tabular-nums;
}

.page-about .about-eco__item-num span {
  font-size: .52em;
  margin-left: 3px;
  color: var(--stone);
}

.page-about .about-eco__item-title {
  margin: 8px 0 6px;
  font-family: var(--font-display);
  font-size: 17px;
  font-weight: 900;
  color: var(--mist);
}

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

/* ---------- 谁在用 ---------- */
.page-about .about-who {
  padding-top: clamp(46px, 7vw, 96px);
}

.page-about .about-who__head .section-head__title {
  color: var(--mist);
}

.page-about .about-who__list {
  list-style: none;
  margin: clamp(22px, 3.4vw, 36px) 0 0;
  padding: 0;
  display: grid;
  gap: 2px;
}

.page-about .about-who__row {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: clamp(14px, 2.6vw, 34px);
  padding: clamp(18px, 2.6vw, 28px) 0;
  border-top: 1px solid var(--line);
  transition: background-color .35s var(--ease), padding-left .35s var(--ease);
}

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

.page-about .about-who__row:hover {
  background: rgba(21, 58, 102, .3);
  padding-left: clamp(6px, 1.4vw, 16px);
}

.page-about .about-who__no {
  margin: 0;
  font-family: var(--font-num);
  font-weight: 700;
  font-size: clamp(18px, 2.4vw, 24px);
  line-height: 1;
  color: var(--orange);
  font-variant-numeric: tabular-nums;
  padding-top: 4px;
}

.page-about .about-who__role {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(17px, 2.2vw, 21px);
  color: var(--mist);
}

.page-about .about-who__text p {
  margin: 8px 0 0;
  max-width: 64ch;
  font-size: 15px;
  line-height: 1.78;
  color: var(--stone);
}

/* ---------- 收尾 ---------- */
.page-about .about-cta {
  padding-top: clamp(42px, 6vw, 82px);
}

.page-about .about-cta__box {
  position: relative;
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(20px, 3vw, 32px);
  align-items: center;
  background: linear-gradient(120deg, var(--navy-900) 0%, var(--steel) 58%, var(--navy-700) 100%);
  border: 1px solid var(--line-strong);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 34px), calc(100% - 34px) 100%, 0 100%);
  padding: clamp(24px, 4vw, 46px);
}

.page-about .about-cta__title {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(22px, 3.6vw, 34px);
  line-height: 1.16;
  color: var(--mist);
}

.page-about .about-cta__text p {
  margin: 12px 0 0;
  max-width: 52ch;
  font-size: 15px;
  line-height: 1.76;
  color: var(--stone);
}

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

/* ---------- 响应式 ---------- */
@media (min-width: 720px) {
  .page-about .about-metrics__grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

@media (min-width: 900px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 1.5fr) minmax(270px, .82fr);
    gap: clamp(30px, 4.6vw, 64px);
  }

  .page-about .about-prod__grid {
    grid-template-columns: minmax(0, 1.06fr) minmax(0, .94fr);
  }

  .page-about .about-prod__figure {
    position: sticky;
    top: 120px;
  }

  .page-about .about-eco__grid {
    grid-template-columns: minmax(0, .9fr) minmax(0, 1.1fr);
    gap: clamp(30px, 4.4vw, 60px);
  }

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

@media (min-width: 960px) {
  .page-about .about-tl {
    grid-template-columns: minmax(0, 1fr) minmax(230px, 330px);
  }

  .page-about .about-tl__figure {
    position: sticky;
    top: 120px;
  }

  .page-about .about-team__card:nth-child(2) {
    margin-top: 32px;
  }

  .page-about .about-team__card:nth-child(3) {
    margin-top: 64px;
  }
}

@media (hover: hover) and (min-width: 960px) {
  .page-about .about-tl__more {
    max-height: 0;
    opacity: 0;
    transition: max-height .38s var(--ease), opacity .38s var(--ease);
  }

  .page-about .about-tl__item:hover .about-tl__more,
  .page-about .about-tl__item:focus-within .about-tl__more {
    max-height: 220px;
    opacity: 1;
  }
}

@media (max-width: 520px) {
  .page-about .about-hero__actions .btn,
  .page-about .about-cta__actions .btn {
    flex: 1 1 100%;
    text-align: center;
  }

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

  .page-about .about-eco__item:nth-child(2),
  .page-about .about-eco__item:nth-child(3) {
    margin-left: 0;
  }
}
</main>