.page-about {
  --about-hair: rgba(11, 42, 74, .12);
  --about-hair-light: rgba(255, 255, 255, .16);
  --about-glow: radial-gradient(100% 70% at 90% -10%, rgba(30, 111, 168, .55), transparent 62%);
  background: var(--paper);
  color: var(--ink);
  font-family: var(--font-sans);
  overflow-x: hidden;
}

.page-about .about-head {
  max-width: 46rem;
}

.page-about .about-head--wide {
  max-width: 60rem;
}

.page-about .about-head--center {
  max-width: 34rem;
  margin-inline: auto;
  text-align: center;
}

.page-about .about-head__title {
  margin: 14px 0 0;
  font-size: clamp(26px, 5.4vw, 44px);
  line-height: 1.16;
  font-weight: 900;
  letter-spacing: -.01em;
  color: var(--blue);
}

.page-about .about-head--invert .about-head__title {
  color: var(--white);
}

.page-about .about-head__lead {
  margin: 18px 0 0;
  font-size: 17px;
  line-height: 1.78;
  color: var(--slate);
}

.page-about .about-head--invert .about-head__lead {
  color: rgba(255, 255, 255, .78);
}

/* ---------- hero ---------- */

.page-about .about-hero {
  position: relative;
  padding-top: calc(var(--header-h) + 40px);
  background: var(--about-glow), linear-gradient(168deg, var(--deep) 0%, var(--blue) 58%, var(--blue-mid) 100%);
  color: var(--white);
}

.page-about .about-hero__inner {
  padding-bottom: 32px;
}

.page-about .about-hero__crumb {
  margin-bottom: 28px;
}

.page-about .about-hero__crumb a,
.page-about .about-hero__crumb span {
  color: rgba(255, 255, 255, .62);
  text-decoration: none;
}

.page-about .about-hero__crumb a:hover {
  color: var(--mint);
}

.page-about .about-hero__grid {
  display: grid;
  gap: 36px;
}

.page-about .about-hero__exhibit {
  margin: 0 0 16px;
}

.page-about .about-hero__title {
  margin: 0;
  font-size: clamp(30px, 7vw, 58px);
  line-height: 1.1;
  font-weight: 900;
  letter-spacing: -.015em;
}

.page-about .about-hero__sub {
  margin: 20px 0 0;
  max-width: 34rem;
  font-size: 16px;
  line-height: 1.8;
  color: rgba(255, 255, 255, .8);
}

.page-about .about-hero__side {
  display: grid;
  gap: 2px;
  border-top: 1px solid var(--about-hair-light);
}

.page-about .about-hero__row {
  display: grid;
  grid-template-columns: auto 1fr;
  align-items: baseline;
  gap: 14px;
  padding: 14px 0;
  border-bottom: 1px solid var(--about-hair-light);
}

.page-about .about-hero__num {
  font-size: 22px;
  font-weight: 700;
  color: var(--mint);
  letter-spacing: .02em;
}

.page-about .about-hero__txt {
  font-size: 14px;
  line-height: 1.6;
  color: rgba(255, 255, 255, .74);
}

.page-about .about-hero__media {
  padding-bottom: 0;
  transform: translateY(6px);
}

.page-about .about-hero__media .media-frame {
  border-radius: var(--radius-l) var(--radius-l) 0 0;
  box-shadow: 0 -8px 40px rgba(6, 26, 46, .35);
}

/* ---------- 时间轴 ---------- */

.page-about .about-timeline {
  padding-top: clamp(48px, 8vw, 88px);
}

.page-about .timeline__list {
  position: relative;
  margin: 44px 0 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 14px;
}

.page-about .timeline__list::before {
  content: "";
  position: absolute;
  left: 5px;
  top: 14px;
  bottom: 14px;
  width: 2px;
  background: linear-gradient(180deg, var(--mint), rgba(47, 212, 180, .08));
}

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

.page-about .timeline__item::before {
  content: "";
  position: absolute;
  left: 0;
  top: 26px;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--mint);
  box-shadow: 0 0 0 4px rgba(47, 212, 180, .16);
  z-index: 1;
}

.page-about .tl-node {
  background: var(--white);
  border: 1px solid var(--about-hair);
  border-radius: var(--radius-m);
  box-shadow: var(--shadow-1);
  transition: transform .16s var(--ease), box-shadow .16s var(--ease), border-color .16s var(--ease);
}

.page-about .tl-node:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-2);
  border-color: rgba(47, 212, 180, .5);
}

.page-about .tl-node__trigger {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 8px 14px;
  padding: 18px 20px;
  cursor: pointer;
  list-style: none;
}

.page-about .tl-node__trigger::-webkit-details-marker {
  display: none;
}

.page-about .tl-node__trigger:focus-visible {
  outline: 2px solid var(--mint);
  outline-offset: 3px;
  border-radius: var(--radius-m);
}

.page-about .tl-node__ver {
  font-size: 12px;
  letter-spacing: .1em;
  text-transform: uppercase;
  color: var(--blue-bright);
  padding: 4px 9px;
  border: 1px solid rgba(30, 111, 168, .28);
  border-radius: 999px;
}

.page-about .tl-node__name {
  font-size: 17px;
  font-weight: 700;
  color: var(--blue);
  line-height: 1.5;
}

.page-about .tl-node__chev {
  margin-left: auto;
  width: 9px;
  height: 9px;
  border-right: 2px solid var(--blue-bright);
  border-bottom: 2px solid var(--blue-bright);
  transform: rotate(45deg) translateY(-3px);
  transition: transform .22s var(--ease);
}

.page-about .tl-node[open] .tl-node__chev {
  transform: rotate(-135deg) translateY(-3px);
}

.page-about .tl-node__panel {
  padding: 0 20px 20px;
}

.page-about .tl-node__panel p {
  margin: 0;
  max-width: 42rem;
  font-size: 15px;
  line-height: 1.8;
  color: var(--slate);
  border-top: 1px solid var(--about-hair);
  padding-top: 14px;
}

/* ---------- 团队 ---------- */

.page-about .about-team {
  background: linear-gradient(180deg, var(--blue) 0%, var(--deep) 100%);
  color: var(--white);
}

.page-about .team-board {
  display: grid;
  gap: 16px;
  margin-top: 40px;
}

.page-about .team-card {
  padding: 24px 22px;
  border: 1px solid var(--about-hair-light);
  border-radius: var(--radius-m);
  background: rgba(30, 111, 168, .16);
  transition: background .18s var(--ease), transform .18s var(--ease), border-color .18s var(--ease);
}

.page-about .team-card:hover,
.page-about .team-card:focus-within {
  background: rgba(47, 212, 180, .14);
  border-color: rgba(47, 212, 180, .55);
  transform: translateY(-4px);
}

.page-about .team-card:focus-visible {
  outline: 2px solid var(--mint);
  outline-offset: 3px;
}

.page-about .team-card__count {
  margin: 0;
  font-size: 40px;
  line-height: 1;
  font-weight: 700;
  color: var(--orange);
  letter-spacing: -.02em;
}

.page-about .team-card__role {
  margin: 12px 0 0;
  font-size: 19px;
  font-weight: 700;
  color: var(--white);
}

.page-about .team-card__desc {
  margin: 10px 0 0;
  font-size: 15px;
  line-height: 1.75;
  color: rgba(255, 255, 255, .82);
}

.page-about .team-card__detail {
  margin: 0;
  max-height: 0;
  overflow: hidden;
  opacity: 0;
  font-size: 14px;
  line-height: 1.75;
  color: rgba(255, 255, 255, .68);
  transition: max-height .28s var(--ease), opacity .24s var(--ease), margin .28s var(--ease);
}

.page-about .team-card:hover .team-card__detail,
.page-about .team-card:focus-within .team-card__detail {
  max-height: 160px;
  opacity: 1;
  margin-top: 12px;
}

/* ---------- 流程 ---------- */

.page-about .about-flow {
  background: var(--paper);
}

.page-about .flow-steps {
  display: grid;
  gap: 0;
  margin: 40px 0 0;
  padding: 0;
  list-style: none;
  border-top: 1px solid var(--about-hair);
}

.page-about .flow-step {
  padding: 22px 0;
  border-bottom: 1px solid var(--about-hair);
  display: grid;
  grid-template-columns: 44px 1fr;
  gap: 4px 16px;
}

.page-about .flow-step__no {
  grid-row: 1 / span 2;
  font-size: 13px;
  letter-spacing: .12em;
  color: var(--mint);
  padding-top: 5px;
}

.page-about .flow-step__name {
  margin: 0;
  font-size: 18px;
  font-weight: 700;
  color: var(--blue);
}

.page-about .flow-step__desc {
  margin: 6px 0 0;
  font-size: 15px;
  line-height: 1.75;
  color: var(--slate);
}

.page-about .about-flow__figure {
  margin: 36px 0 0;
}

/* ---------- 家庭观赛 ---------- */

.page-about .about-family {
  background: linear-gradient(180deg, rgba(168, 233, 220, .22) 0%, rgba(168, 233, 220, 0) 78%);
}

.page-about .about-family__inner {
  display: grid;
  gap: 34px;
  align-items: start;
}

.page-about .about-family__lead {
  margin: 20px 0 0;
  font-size: 18px;
  line-height: 1.75;
  font-weight: 500;
  color: var(--blue);
}

.page-about .about-family__body > p {
  font-size: 16px;
  line-height: 1.82;
  color: var(--slate);
}

.page-about .about-family__list {
  margin: 22px 0 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 12px;
}

.page-about .about-family__list li {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px;
  font-size: 15px;
  line-height: 1.7;
  color: var(--ink);
}

.page-about .about-family__more {
  margin-top: 22px;
}

.page-about .about-family__more a {
  color: var(--blue-bright);
  font-weight: 500;
  text-underline-offset: 3px;
}

.page-about .about-family__more a:hover {
  color: var(--orange);
}

.page-about .about-family__figure {
  margin: 0;
  box-shadow: var(--shadow-2);
}

/* ---------- 合作 ---------- */

.page-about .about-partner {
  background: var(--paper);
}

.page-about .partner-split {
  display: grid;
  gap: 28px;
  margin-top: 40px;
}

.page-about .partner-split__facts {
  display: grid;
  gap: 0;
  border-top: 1px solid var(--about-hair);
}

.page-about .partner-fact {
  display: grid;
  grid-template-columns: auto 1fr;
  align-items: baseline;
  gap: 16px;
  padding: 18px 0;
  border-bottom: 1px solid var(--about-hair);
}

.page-about .partner-fact__num {
  font-size: 30px;
  font-weight: 700;
  color: var(--orange);
  letter-spacing: -.02em;
}

.page-about .partner-fact__txt {
  font-size: 15px;
  line-height: 1.7;
  color: var(--slate);
}

.page-about .partner-split__note {
  padding: 22px;
  border-radius: var(--radius-m);
  background: rgba(168, 233, 220, .28);
  border: 1px solid rgba(47, 212, 180, .35);
}

.page-about .partner-split__note p {
  margin: 0;
  font-size: 15px;
  line-height: 1.8;
  color: var(--ink);
}

.page-about .partner-split__note p + p {
  margin-top: 14px;
}

.page-about .partner-split__note a {
  color: var(--blue-bright);
  font-weight: 500;
  text-underline-offset: 3px;
}

.page-about .partner-split__note a:hover {
  color: var(--orange);
}

/* ---------- 收束 ---------- */

.page-about .about-stand {
  background: var(--paper);
}

.page-about .stand-list {
  display: grid;
  gap: 0;
  margin: 44px 0 0;
  padding: 0;
  list-style: none;
  max-width: 40rem;
  margin-inline: auto;
  border-top: 1px solid var(--about-hair);
}

.page-about .stand-item {
  padding: 24px 0;
  border-bottom: 1px solid var(--about-hair);
}

.page-about .stand-item__name {
  margin: 0;
  font-size: 19px;
  font-weight: 700;
  color: var(--blue);
}

.page-about .stand-item__name::before {
  content: "";
  display: inline-block;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--orange);
  margin-right: 12px;
  vertical-align: 2px;
}

.page-about .stand-item__desc {
  margin: 8px 0 0 20px;
  font-size: 15px;
  line-height: 1.8;
  color: var(--slate);
}

.page-about .about-cta {
  max-width: 40rem;
  margin: 44px auto 0;
  padding: 26px 24px;
  border-radius: var(--radius-l);
  background: linear-gradient(135deg, var(--blue) 0%, var(--blue-mid) 100%);
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 18px;
}

.page-about .about-cta__text {
  margin: 0;
  font-size: 15px;
  line-height: 1.7;
  color: rgba(255, 255, 255, .86);
  flex: 1 1 16rem;
}

/* ---------- 响应式 ---------- */

@media (min-width: 720px) {
  .page-about .about-hero__inner {
    padding-bottom: 44px;
  }

  .page-about .flow-steps {
    grid-template-columns: repeat(2, 1fr);
    border-bottom: 1px solid var(--about-hair);
  }

  .page-about .flow-step {
    padding: 26px 26px 26px 0;
    border-bottom: 0;
    border-right: 1px solid var(--about-hair);
  }

  .page-about .flow-step:nth-child(2n) {
    padding-right: 0;
    padding-left: 26px;
    border-right: 0;
  }

  .page-about .flow-step:nth-child(n+3) {
    border-top: 1px solid var(--about-hair);
  }

  .page-about .team-board {
    gap: 20px;
  }
}

@media (min-width: 900px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 1.4fr) minmax(0, .75fr);
    align-items: end;
    gap: 56px;
  }

  .page-about .timeline__list::before {
    top: 18px;
    bottom: 18px;
  }

  .page-about .timeline__item {
    padding-left: 40px;
  }

  .page-about .tl-node__trigger {
    padding: 20px 26px;
  }

  .page-about .tl-node__panel {
    padding: 0 26px 22px;
  }

  .page-about .team-board {
    grid-template-columns: 1.25fr 1fr .9fr;
    align-items: stretch;
  }

  .page-about .flow-steps {
    grid-template-columns: repeat(4, 1fr);
  }

  .page-about .flow-step {
    padding: 28px 22px 28px 0;
    border-right: 1px solid var(--about-hair);
    border-top: 0;
  }

  .page-about .flow-step:nth-child(2n) {
    padding-left: 22px;
    padding-right: 22px;
    border-right: 1px solid var(--about-hair);
  }

  .page-about .flow-step:nth-child(n+3) {
    border-top: 0;
  }

  .page-about .flow-step:last-child {
    padding-right: 0;
    border-right: 0;
  }

  .page-about .about-family__inner {
    grid-template-columns: minmax(0, 1.15fr) minmax(0, .85fr);
    gap: 56px;
    align-items: center;
  }

  .page-about .about-family__figure {
    margin-top: 8px;
  }

  .page-about .partner-split {
    grid-template-columns: minmax(0, 1.15fr) minmax(0, .85fr);
    gap: 44px;
    align-items: start;
  }

  .page-about .about-flow__figure {
    margin-top: 44px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .tl-node,
  .page-about .team-card,
  .page-about .tl-node__chev,
  .page-about .team-card__detail {
    transition: none;
  }

  .page-about .tl-node:hover,
  .page-about .team-card:hover,
  .page-about .team-card:focus-within {
    transform: none;
  }
}