.page-about {
  --about-line: rgba(16, 24, 38, 0.14);
  --about-line-soft: rgba(16, 24, 38, 0.08);
  --about-line-light: rgba(255, 255, 255, 0.16);
  color: var(--c-ink);
}

/* ============ 首屏 ============ */
.page-about .about-hero {
  position: relative;
  background: var(--c-navy);
  color: #fff;
  padding: 44px 0 56px;
  overflow: hidden;
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image: repeating-linear-gradient(90deg, rgba(255, 255, 255, 0.045) 0 1px, transparent 1px 48px);
  pointer-events: none;
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  right: -90px;
  top: -100px;
  width: 340px;
  height: 340px;
  background: radial-gradient(circle, rgba(255, 122, 33, 0.3), transparent 68%);
  pointer-events: none;
}

.page-about .about-hero__inner {
  position: relative;
  z-index: 1;
  display: grid;
  gap: 40px;
}

.page-about .about-hero__title {
  margin: 18px 0 0;
  font-size: clamp(30px, 6.2vw, 54px);
  line-height: 1.08;
  letter-spacing: -0.02em;
  font-weight: 900;
  max-width: 15em;
}

.page-about .about-hero__lead {
  margin: 20px 0 0;
  font-size: var(--fs-body);
  line-height: 1.75;
  color: rgba(255, 255, 255, 0.88);
  max-width: 32em;
}

.page-about .about-hero__sub {
  margin: 14px 0 0;
  font-size: var(--fs-s);
  line-height: 1.85;
  color: var(--text-on-dark-soft);
  max-width: 34em;
}

.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 28px;
}

.page-about .about-hero__side {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--about-line-light);
  border: 1px solid var(--about-line-light);
  align-self: start;
}

.page-about .about-stat {
  background: var(--c-navy-2);
  padding: 18px 16px 20px;
  display: flex;
  flex-direction: column;
  gap: 8px;
  min-width: 0;
}

.page-about .about-stat__num {
  font-size: var(--fs-l);
  line-height: 1;
  font-weight: 700;
  color: var(--c-orange);
  letter-spacing: -0.01em;
  word-break: break-word;
}

.page-about .about-stat__unit {
  font-size: var(--fs-s);
  margin-left: 2px;
}

.page-about .about-stat__label {
  font-size: var(--fs-tag);
  letter-spacing: 0.08em;
  line-height: 1.5;
  color: var(--text-on-dark);
}

/* ============ 通用区块 ============ */
.page-about .about-block {
  padding: 52px 0 60px;
  border-top: 1px solid var(--about-line);
  background: var(--c-paper);
}

.page-about .about-block--mist {
  background: var(--c-mist);
}

.page-about .about-block--navy {
  background: var(--c-navy);
  color: #fff;
  border-top-color: var(--about-line-light);
}

.page-about .about-head {
  margin-bottom: 32px;
}

.page-about .about-head__inner {
  display: flex;
  gap: 16px;
  align-items: flex-start;
}

.page-about .about-head__num {
  flex: 0 0 auto;
  width: 40px;
  padding-top: 9px;
  border-top: 2px solid var(--c-orange);
  font-size: var(--fs-s);
  font-weight: 700;
  letter-spacing: 0.12em;
  color: var(--c-orange);
  line-height: 1;
}

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

.page-about .about-head__title {
  margin: 0;
  font-size: clamp(23px, 3.4vw, 34px);
  line-height: 1.15;
  letter-spacing: -0.02em;
  font-weight: 900;
}

.page-about .about-head__note {
  margin: 10px 0 0;
  font-size: var(--fs-s);
  line-height: 1.7;
  color: var(--text-soft);
  max-width: 40em;
}

.page-about .about-block--navy .about-head__note {
  color: var(--text-on-dark-soft);
}

/* ============ 01 每天在做的事 ============ */
.page-about .about-what__body {
  display: grid;
  gap: 36px;
}

.page-about .about-what__text {
  border-left: 2px solid var(--c-green);
  padding-left: 18px;
}

.page-about .about-what__text p {
  margin: 0 0 16px;
  font-size: var(--fs-body);
  line-height: 1.82;
  color: var(--c-ink);
  max-width: 34em;
}

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

.page-about .about-what__steps {
  list-style: none;
  margin: 0;
  padding: 0;
  border-top: 1px solid var(--about-line);
}

.page-about .about-what__steps > li {
  display: grid;
  grid-template-columns: 62px minmax(0, 1fr);
  gap: 12px;
  align-items: baseline;
  padding: 15px 0;
  border-bottom: 1px solid var(--about-line-soft);
}

.page-about .about-what__stepnum {
  font-size: var(--fs-tag);
  letter-spacing: 0.1em;
  font-weight: 700;
  color: var(--c-green-deep);
}

.page-about .about-what__steptext {
  font-size: var(--fs-s);
  line-height: 1.75;
  color: var(--text-soft);
}

/* ============ 02 时间轴 ============ */
.page-about .about-timeline__layout {
  display: grid;
  gap: 32px;
}

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

.page-about .about-timeline__figure img {
  border: 1px solid var(--about-line);
}

.page-about .timeline {
  list-style: none;
  margin: 0;
  padding: 4px 0 4px 28px;
  position: relative;
}

.page-about .timeline::before {
  content: "";
  position: absolute;
  left: 7px;
  top: 10px;
  bottom: 10px;
  width: 1px;
  background: linear-gradient(180deg, var(--c-green) 0%, var(--c-orange) 100%);
}

.page-about .timeline__item {
  position: relative;
  padding-bottom: 32px;
}

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

.page-about .timeline__item::before {
  content: "";
  position: absolute;
  left: -27px;
  top: 7px;
  width: 11px;
  height: 11px;
  border-radius: 50%;
  background: var(--c-orange);
  box-shadow: 0 0 0 4px rgba(255, 122, 33, 0.16);
}

.page-about .timeline__title {
  margin: 12px 0 0;
  font-size: var(--fs-m);
  line-height: 1.25;
  font-weight: 700;
  letter-spacing: -0.01em;
  color: var(--c-ink);
}

.page-about .timeline__text {
  margin: 10px 0 0;
  font-size: var(--fs-body);
  line-height: 1.75;
  color: var(--text-soft);
  max-width: 32em;
}

.page-about .timeline__more {
  margin-top: 8px;
  font-size: var(--fs-s);
  line-height: 1.7;
  color: var(--c-green-deep);
  max-width: 32em;
}

@media (hover: hover) {
  .page-about .timeline__more {
    max-height: 0;
    margin-top: 0;
    overflow: hidden;
    opacity: 0;
    transition: max-height 220ms ease-out, opacity 180ms ease-out, margin-top 220ms ease-out;
  }

  .page-about .timeline__item:hover .timeline__more,
  .page-about .timeline__item:focus-within .timeline__more {
    max-height: 140px;
    margin-top: 8px;
    opacity: 1;
  }
}

/* ============ 03 团队 ============ */
.page-about .about-team__layout {
  display: grid;
  gap: 32px;
}

.page-about .about-team__cards {
  display: grid;
  gap: 16px;
}

.page-about .about-team__card {
  padding: 22px 20px 24px;
  border: 1px solid var(--about-line);
  border-radius: var(--radius);
  background: var(--c-paper);
  display: flex;
  flex-direction: column;
  gap: 12px;
  align-items: flex-start;
}

.page-about .about-team__card .card__title {
  margin: 0;
  font-size: var(--fs-m);
  line-height: 1.25;
  font-weight: 700;
}

.page-about .about-team__card .card__body {
  margin: 0;
  font-size: var(--fs-s);
  line-height: 1.75;
  color: var(--text-soft);
}

.page-about .about-team__points {
  list-style: none;
  margin: 4px 0 0;
  padding: 0;
  width: 100%;
}

.page-about .about-team__points > li {
  position: relative;
  padding: 9px 0 9px 16px;
  font-size: var(--fs-s);
  line-height: 1.7;
  color: var(--text-soft);
  border-top: 1px solid var(--about-line-soft);
}

.page-about .about-team__points > li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 17px;
  width: 6px;
  height: 6px;
  background: var(--c-green);
}

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

/* ============ 04 数据能力 ============ */
.page-about .about-data__figure {
  margin: 0 0 28px;
}

.page-about .about-data__figure img {
  border: 1px solid var(--about-line-light);
}

.page-about .about-data__grid {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 1px;
  background: var(--about-line-light);
  border: 1px solid var(--about-line-light);
}

.page-about .about-data__item {
  background: var(--c-navy-2);
  padding: 18px 16px 20px;
  display: flex;
  flex-direction: column;
  gap: 7px;
  min-width: 0;
  transition: background 160ms ease-out;
}

.page-about .about-data__item:hover,
.page-about .about-data__item:focus-within {
  background: rgba(15, 163, 107, 0.22);
}

.page-about .about-data__idx {
  font-size: var(--fs-tag);
  letter-spacing: 0.12em;
  color: var(--c-orange);
  font-weight: 700;
}

.page-about .about-data__name {
  margin: 0;
  font-size: var(--fs-s);
  font-weight: 700;
  letter-spacing: 0.02em;
  color: #fff;
}

.page-about .about-data__desc {
  margin: 0;
  font-size: var(--fs-tag);
  line-height: 1.7;
  color: var(--text-on-dark-soft);
}

.page-about .about-data__foot {
  margin: 24px 0 0;
  font-size: var(--fs-s);
  line-height: 1.8;
  color: var(--text-on-dark);
  max-width: 42em;
  padding-left: 14px;
  border-left: 2px solid var(--c-cyan);
}

/* ============ 05 合作生态 ============ */
.page-about .about-partner__grid {
  display: grid;
  gap: 20px;
}

.page-about .about-partner__block {
  padding: 24px 20px 26px;
  background: var(--c-paper);
  border: 1px solid var(--about-line);
  border-top: 3px solid var(--c-green);
}

.page-about .about-partner__block:nth-child(2) {
  border-top-color: var(--c-orange);
}

.page-about .about-partner__title {
  margin: 14px 0 12px;
  font-size: var(--fs-m);
  line-height: 1.25;
  font-weight: 700;
  letter-spacing: -0.01em;
}

.page-about .about-partner__block p {
  margin: 0 0 12px;
  font-size: var(--fs-s);
  line-height: 1.82;
  color: var(--text-soft);
}

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

/* ============ 06 服务覆盖 ============ */
.page-about .about-service__grid {
  display: grid;
  gap: 1px;
  background: var(--about-line);
  border: 1px solid var(--about-line);
}

.page-about .about-service__item {
  background: var(--c-paper);
  padding: 22px 18px 24px;
  display: flex;
  flex-direction: column;
  gap: 8px;
  min-width: 0;
}

.page-about .about-service__num {
  font-size: var(--fs-m);
  font-weight: 700;
  line-height: 1.1;
  color: var(--c-action);
  letter-spacing: -0.01em;
  word-break: break-word;
}

.page-about .about-service__name {
  margin: 0;
  font-size: var(--fs-s);
  font-weight: 700;
  letter-spacing: 0.06em;
  color: var(--c-ink);
}

.page-about .about-service__item p {
  margin: 0;
  font-size: var(--fs-tag);
  line-height: 1.78;
  color: var(--text-soft);
}

.page-about .about-service__foot {
  margin: 26px 0 0;
  font-size: var(--fs-s);
  line-height: 1.8;
  color: var(--text-soft);
  max-width: 42em;
  padding-left: 14px;
  border-left: 2px solid var(--c-green);
}

/* ============ 收束卡片 ============ */
.page-about .about-next {
  padding: 44px 0 56px;
  background: var(--c-navy);
  border-top: 0;
  color: #fff;
}

.page-about .about-next__cards {
  display: grid;
  gap: 1px;
  background: var(--about-line-light);
  border: 1px solid var(--about-line-light);
}

.page-about .about-next__card {
  display: flex;
  flex-direction: column;
  gap: 12px;
  align-items: flex-start;
  padding: 24px 20px 26px;
  background: var(--c-navy-2);
  color: #fff;
  text-decoration: none;
  transition: background 160ms ease-out;
}

.page-about .about-next__card:hover,
.page-about .about-next__card:focus-visible {
  background: rgba(15, 163, 107, 0.24);
}

.page-about .about-next__card:focus-visible {
  outline: 2px solid var(--c-orange);
  outline-offset: -2px;
}

.page-about .about-next__title {
  margin: 0;
  font-size: var(--fs-m);
  line-height: 1.25;
  font-weight: 700;
  letter-spacing: -0.01em;
}

.page-about .about-next__desc {
  margin: 0;
  font-size: var(--fs-s);
  line-height: 1.75;
  color: var(--text-on-dark);
}

.page-about .about-next__card .exhibit-tag {
  border-color: var(--about-line-light);
  color: var(--c-orange);
}

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

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

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

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

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

@media (min-width: 960px) {
  .page-about .about-hero {
    padding: 64px 0 76px;
  }

  .page-about .about-hero__inner {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    gap: 56px;
    align-items: start;
  }

  .page-about .about-block {
    padding: 72px 0 84px;
  }

  .page-about .about-head {
    margin-bottom: 40px;
  }

  .page-about .about-what__body {
    grid-template-columns: minmax(0, 6fr) minmax(0, 5fr);
    gap: 56px;
    align-items: start;
  }

  .page-about .about-timeline__layout {
    grid-template-columns: minmax(0, 5fr) minmax(0, 7fr);
    gap: 56px;
    align-items: start;
  }

  .page-about .about-timeline__figure {
    position: sticky;
    top: 124px;
  }

  .page-about .about-team__layout {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    gap: 48px;
    align-items: start;
  }

  .page-about .about-team__cards {
    grid-template-columns: minmax(0, 1fr);
    gap: 14px;
  }

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

  .page-about .about-team__figure {
    position: sticky;
    top: 124px;
  }
}

@media (min-width: 1200px) {
  .page-about .about-service__grid {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

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

  .page-about .timeline__more {
    transition: none;
  }
}
</main>