.page-about {
  --about-line-soft: rgba(5, 8, 15, .14);
  --about-card-shadow: 0 18px 0 -12px rgba(5, 8, 15, .12);
  display: block;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  overflow: hidden;
  background: var(--night);
  color: var(--paper);
  padding: var(--sp-5) 0 var(--sp-6);
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  right: -18%;
  top: -20%;
  width: 78%;
  height: 150%;
  background: linear-gradient(155deg, var(--gold) 0%, var(--flare) 100%);
  opacity: .14;
  clip-path: polygon(46% 0, 100% 0, 100% 100%, 0 100%);
  pointer-events: none;
}

.page-about .about-hero__inner {
  position: relative;
  z-index: 1;
  display: grid;
  gap: var(--sp-5);
}

.page-about .about-hero__lead {
  max-width: 40rem;
}

.page-about .about-hero h1 {
  margin: var(--sp-2) 0 0;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(32px, 8vw, 56px);
  line-height: 1.12;
  letter-spacing: -.01em;
  color: var(--white);
}

.page-about .about-hero__lede {
  margin: var(--sp-3) 0 0;
  font-size: 16px;
  line-height: 1.75;
  color: rgba(247, 243, 234, .82);
}

.page-about .about-hero__actions {
  margin-top: var(--sp-4);
}

.page-about .about-hero__figures {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin: 0;
  padding: 1px;
  list-style: none;
  background: rgba(247, 243, 234, .18);
}

.page-about .about-hero__fig {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: var(--sp-2) var(--sp-2) var(--sp-3);
  background: var(--night);
}

.page-about .about-hero__num {
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: 28px;
  line-height: 1.1;
  color: var(--gold);
}

.page-about .about-hero__unit {
  margin-left: 2px;
  font-size: 14px;
  font-weight: 400;
  color: var(--gold-soft);
}

.page-about .about-hero__cap {
  font-size: 12px;
  letter-spacing: .08em;
  color: rgba(247, 243, 234, .6);
}

/* ---------- 通栏氛围图 ---------- */
.page-about .about-banner {
  position: relative;
  margin: 0;
  background: var(--ink);
  border-top: 1px solid var(--ink);
  border-bottom: 1px solid var(--ink);
}

.page-about .about-banner img {
  display: block;
  width: 100%;
  height: auto;
  max-width: 100%;
  aspect-ratio: 1400 / 800;
  object-fit: cover;
  opacity: .92;
}

.page-about .about-banner__cap {
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  padding: var(--sp-3) var(--sp-2);
  font-size: 13px;
  line-height: 1.6;
  color: var(--paper);
  background: linear-gradient(180deg, rgba(5, 8, 15, 0) 0%, rgba(5, 8, 15, .82) 78%);
}

/* ---------- 章节头 ---------- */
.page-about .about-sec__head {
  max-width: 46rem;
  margin-bottom: var(--sp-5);
}

.page-about .about-sec__head h2 {
  margin: var(--sp-2) 0 0;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(26px, 6vw, 40px);
  line-height: 1.18;
  letter-spacing: -.01em;
  color: var(--ink);
}

.page-about .about-sec__intro {
  margin: var(--sp-3) 0 0;
  font-size: 16px;
  line-height: 1.75;
  color: var(--muted);
}

/* ---------- 时间轴 ---------- */
.page-about .about-axis-sec {
  background: var(--paper);
}

.page-about .about-years {
  display: flex;
  flex-wrap: wrap;
  gap: var(--sp-1);
  margin: 0 0 var(--sp-5);
  padding: 0;
  list-style: none;
}

.page-about .about-years__link {
  display: block;
  padding: 6px 12px;
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: .06em;
  color: var(--ink);
  text-decoration: none;
  background: var(--white);
  border: 1px solid var(--ink);
  transition: background 120ms var(--ease), color 120ms var(--ease), transform 120ms var(--ease);
}

.page-about .about-years__link:hover,
.page-about .about-years__link:focus-visible {
  background: var(--gold);
  transform: translateY(-2px);
}

.page-about .about-axis {
  position: relative;
  margin: 0;
  padding: 0 0 0 36px;
  list-style: none;
}

.page-about .about-axis::before {
  content: "";
  position: absolute;
  top: 10px;
  bottom: 10px;
  left: 8px;
  width: 1px;
  background: var(--ink);
  opacity: .26;
}

.page-about .about-node {
  position: relative;
  padding-bottom: var(--sp-5);
}

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

.page-about .about-node::before {
  content: "";
  position: absolute;
  top: 20px;
  left: -32px;
  width: 9px;
  height: 9px;
  background: var(--gold);
  border: 1px solid var(--ink);
}

.page-about .about-node__card {
  padding: var(--sp-3);
  background: var(--white);
  border: 1px solid var(--ink);
  box-shadow: var(--about-card-shadow);
  transition: transform 180ms var(--ease), box-shadow 180ms var(--ease);
}

.page-about .about-node__card:hover {
  transform: translateY(-2px);
  box-shadow: 0 22px 0 -12px rgba(5, 8, 15, .2);
}

.page-about .about-node__year {
  display: block;
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: 28px;
  line-height: 1;
  letter-spacing: .02em;
  color: var(--gold);
}

.page-about .about-node__title {
  margin: var(--sp-2) 0 var(--sp-2);
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 20px;
  line-height: 1.35;
  color: var(--ink);
}

.page-about .about-node__card p {
  margin: 0;
  font-size: 16px;
  line-height: 1.75;
  color: var(--muted);
}

/* ---------- 团队 ---------- */
.page-about .about-team {
  background: var(--sand);
  border-top: 1px solid var(--ink);
  border-bottom: 1px solid var(--ink);
}

.page-about .about-team__grid {
  display: grid;
  gap: var(--sp-4);
}

.page-about .about-team__intro h2 {
  margin: var(--sp-2) 0 0;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(26px, 6vw, 40px);
  line-height: 1.18;
  letter-spacing: -.01em;
  color: var(--ink);
}

.page-about .about-team__p {
  margin: var(--sp-3) 0 0;
  font-size: 16px;
  line-height: 1.75;
  color: var(--ink);
  opacity: .84;
}

.page-about .about-team__figure {
  margin: 0;
  background: var(--white);
  border: 1px solid var(--ink);
}

.page-about .about-team__figure img {
  display: block;
  width: 100%;
  height: auto;
  max-width: 100%;
  aspect-ratio: 1200 / 800;
  object-fit: cover;
}

.page-about .about-team__figcap {
  padding: var(--sp-2);
  font-size: 13px;
  line-height: 1.6;
  color: var(--muted);
  border-top: 1px solid var(--about-line-soft);
}

.page-about .about-team__chart {
  margin-top: var(--sp-5);
  padding: var(--sp-3);
  background: var(--white);
  border: 1px solid var(--ink);
}

.page-about .about-team__chart-title {
  margin: 0 0 var(--sp-3);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .1em;
  color: var(--muted);
  text-transform: uppercase;
}

.page-about .about-team__bars {
  display: grid;
  gap: var(--sp-3);
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .about-team__bar {
  display: grid;
  grid-template-columns: 5.6em 1fr 2.6em;
  align-items: center;
  gap: var(--sp-1);
}

.page-about .about-team__role {
  font-size: 13px;
  color: var(--ink);
}

.page-about .about-team__track {
  position: relative;
  height: 26px;
  background: var(--paper);
  border: 1px solid var(--about-line-soft);
}

.page-about .about-team__fill {
  display: block;
  height: 100%;
  background-image: repeating-linear-gradient(90deg, transparent 0 15px, rgba(5, 8, 15, .3) 15px 16px);
  transition: width 180ms var(--ease);
}

.page-about .about-team__fill.is-edit {
  width: 100%;
  background-color: var(--gold);
}

.page-about .about-team__fill.is-eng {
  width: 86%;
  background-color: var(--panel);
}

.page-about .about-team__fill.is-ops {
  width: 68%;
  background-color: var(--cyan);
}

.page-about .about-team__count {
  font-family: var(--font-mono);
  font-size: 18px;
  font-weight: 700;
  text-align: right;
  color: var(--ink);
}

/* ---------- 数据来源 ---------- */
.page-about .about-sources {
  position: relative;
  overflow: hidden;
  background: var(--night);
  color: var(--paper);
  padding: var(--sp-6) 0;
}

.page-about .about-sources__bg {
  position: absolute;
  inset: 0;
  pointer-events: none;
}

.page-about .about-sources__bg img {
  display: block;
  width: 100%;
  height: 100%;
  max-width: 100%;
  object-fit: cover;
  opacity: .16;
}

.page-about .about-sources__inner {
  position: relative;
  z-index: 1;
  display: grid;
  gap: var(--sp-5);
}

.page-about .about-sources__lead h2 {
  margin: var(--sp-2) 0 0;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(26px, 6vw, 40px);
  line-height: 1.18;
  letter-spacing: -.01em;
  color: var(--white);
}

.page-about .about-sources__lead p {
  margin: var(--sp-3) 0 0;
  max-width: 34rem;
  font-size: 16px;
  line-height: 1.75;
  color: rgba(247, 243, 234, .8);
}

.page-about .about-sources__list {
  display: grid;
  gap: var(--sp-3);
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .about-sources__item {
  display: grid;
  grid-template-columns: 2.4em 1fr;
  gap: var(--sp-2);
  padding: var(--sp-3);
  background: rgba(22, 35, 58, .72);
  border: 1px solid var(--line-light);
  transition: transform 180ms var(--ease), border-color 120ms var(--ease);
}

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

.page-about .about-sources__no {
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: .08em;
  color: var(--flare);
}

.page-about .about-sources__title {
  margin: 0 0 6px;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 17px;
  line-height: 1.4;
  color: var(--gold-soft);
}

.page-about .about-sources__item p {
  margin: 0;
  font-size: 14px;
  line-height: 1.7;
  color: rgba(247, 243, 234, .72);
}

/* ---------- 伙伴与荣誉 ---------- */
.page-about .about-partners {
  background: var(--paper);
}

.page-about .about-partners__grid {
  display: grid;
  gap: var(--sp-3);
}

.page-about .about-partners__block {
  padding: var(--sp-3);
  background: var(--white);
  border: 1px solid var(--ink);
  box-shadow: var(--about-card-shadow);
  transition: transform 180ms var(--ease), background 120ms var(--ease);
}

.page-about .about-partners__block:hover {
  transform: translateY(-2px);
}

.page-about .about-partners__block--award {
  background: var(--gold-soft);
}

.page-about .about-partners__num {
  display: block;
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: 40px;
  line-height: 1;
  color: var(--ink);
}

.page-about .about-partners__block h3 {
  margin: var(--sp-2) 0 var(--sp-1);
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 18px;
  color: var(--ink);
}

.page-about .about-partners__block p {
  margin: 0;
  font-size: 15px;
  line-height: 1.72;
  color: var(--muted);
}

.page-about .about-partners__block--award p {
  color: rgba(5, 8, 15, .78);
}

/* ---------- 结尾 ---------- */
.page-about .about-cta {
  background: var(--gold);
  border-top: 1px solid var(--ink);
  border-bottom: 1px solid var(--ink);
  padding: var(--sp-5) 0;
}

.page-about .about-cta__inner {
  display: grid;
  gap: var(--sp-4);
}

.page-about .about-cta h2 {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(24px, 5.5vw, 36px);
  line-height: 1.2;
  letter-spacing: -.01em;
  color: var(--ink);
}

.page-about .about-cta p {
  margin: var(--sp-2) 0 0;
  max-width: 38rem;
  font-size: 16px;
  line-height: 1.75;
  color: rgba(5, 8, 15, .82);
}

.page-about .about-cta__actions {
  align-self: end;
}

/* ---------- 断点 ---------- */
@media (min-width: 720px) {
  .page-about .about-hero {
    padding: var(--sp-6) 0;
  }

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

  .page-about .about-banner__cap {
    padding: var(--sp-3) var(--sp-4);
    font-size: 14px;
  }

  .page-about .about-team__grid {
    grid-template-columns: minmax(0, 1.15fr) minmax(0, .85fr);
    align-items: start;
    gap: var(--sp-5);
  }

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

  .page-about .about-cta__inner {
    grid-template-columns: minmax(0, 1.4fr) minmax(0, .6fr);
    align-items: end;
  }
}

@media (min-width: 900px) {
  .page-about .about-axis {
    padding-left: 0;
  }

  .page-about .about-axis::before {
    top: 14px;
    bottom: 14px;
    left: calc(50% - .5px);
  }

  .page-about .about-node {
    display: grid;
    grid-template-columns: 1fr 1fr;
    column-gap: 80px;
    padding-bottom: var(--sp-6);
  }

  .page-about .about-node__card {
    grid-column: 1;
  }

  .page-about .about-node:nth-child(even) .about-node__card {
    grid-column: 2;
  }

  .page-about .about-node::before {
    top: 26px;
    left: calc(50% - 5px);
  }

  .page-about .about-node__year {
    font-size: 40px;
  }

  .page-about .about-sources__inner {
    grid-template-columns: minmax(0, .82fr) minmax(0, 1.18fr);
    gap: var(--sp-6);
    align-items: start;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-node__card,
  .page-about .about-sources__item,
  .page-about .about-partners__block,
  .page-about .about-years__link,
  .page-about .about-team__fill {
    transition: none;
  }

  .page-about .about-node__card:hover,
  .page-about .about-sources__item:hover,
  .page-about .about-partners__block:hover,
  .page-about .about-years__link:hover {
    transform: none;
  }
}