.page-about {
  --about-axis: 62px;
  --about-gap: clamp(14px, 3vw, 28px);
  background: var(--deep);
  color: var(--silver);
  font-family: var(--font-sans);
  overflow-x: clip;
}

/* ---------- 面包屑下的首屏 ---------- */
.page-about .about-hero {
  position: relative;
  isolation: isolate;
  overflow: hidden;
  padding: clamp(30px, 6vw, 78px) 0 clamp(30px, 5vw, 62px);
  background:
    radial-gradient(120% 90% at 88% 4%, rgba(0, 229, 255, .13) 0%, rgba(0, 229, 255, 0) 60%),
    var(--deep);
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  top: -32%;
  right: -22%;
  width: min(620px, 82vw);
  height: min(620px, 82vw);
  background: linear-gradient(135deg, rgba(18, 36, 74, .95) 0%, rgba(0, 229, 255, .26) 100%);
  clip-path: polygon(30% 0, 100% 0, 100% 70%, 0 100%);
  z-index: -1;
  opacity: .8;
  pointer-events: none;
}

.page-about .about-hero__grid {
  display: grid;
  gap: clamp(22px, 4vw, 40px);
  align-items: start;
}

.page-about .about-hero h1 {
  margin: 14px 0 16px;
  max-width: 20ch;
  color: var(--white);
  font-size: clamp(30px, 6.4vw, 58px);
  font-weight: 900;
  line-height: 1.08;
  letter-spacing: -.02em;
}

.page-about .about-hero .lede {
  color: var(--silver);
  font-size: clamp(15px, 1.6vw, 17px);
  line-height: 1.75;
}

.page-about .about-hero .btn-row {
  margin-top: 22px;
}

.page-about .about-hero__panel {
  border: 2px solid var(--line-soft);
  background: var(--deep-2);
  box-shadow: var(--shadow-cyan);
  padding: 20px 20px 16px;
}

.page-about .about-hero__panel-title {
  margin: 0 0 12px;
  padding-bottom: 10px;
  border-bottom: 1px solid var(--line-soft);
  color: var(--cyan);
  font-size: 12px;
  letter-spacing: .16em;
  text-transform: uppercase;
}

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

.page-about .about-facts li {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  justify-content: space-between;
  gap: 6px 12px;
  padding: 10px 0;
  border-bottom: 1px dashed var(--line-soft);
}

.page-about .about-facts li:last-child {
  border-bottom: 0;
  padding-bottom: 2px;
}

.page-about .about-facts__k {
  color: var(--silver);
  font-size: 14px;
}

.page-about .about-facts__v {
  color: var(--white);
  font-size: 14px;
  font-weight: 700;
  letter-spacing: -.01em;
}

/* ---------- 页内快速定位 ---------- */
.page-about .about-index {
  border-top: 1px solid var(--line-soft);
  border-bottom: 1px solid var(--line-soft);
  background: rgba(6, 13, 26, .62);
}

.page-about .about-index__row {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px 20px;
  padding: 12px 0;
  font-family: var(--font-mono);
  font-size: 13px;
}

.page-about .about-index__label {
  color: var(--orange);
  letter-spacing: .14em;
  text-transform: uppercase;
}

.page-about .about-index__row a {
  position: relative;
  color: var(--silver);
  text-decoration: none;
  padding-bottom: 2px;
  border-bottom: 1px solid transparent;
  transition: color .2s ease, border-color .2s ease;
}

.page-about .about-index__row a:hover,
.page-about .about-index__row a:focus-visible {
  color: var(--cyan);
  border-bottom-color: var(--cyan);
}

/* ---------- 通用小标题行 ---------- */
.page-about .about-head {
  margin-bottom: clamp(24px, 4vw, 40px);
}

.page-about .about-head h2 {
  margin: 10px 0 12px;
  max-width: 24ch;
  color: var(--white);
  font-size: clamp(24px, 4.4vw, 40px);
  font-weight: 900;
  line-height: 1.14;
  letter-spacing: -.02em;
}

.page-about .about-head .measure {
  color: var(--silver);
  font-size: 16px;
  line-height: 1.75;
}

/* ---------- 发展脉络 ---------- */
.page-about .about-timeline {
  border-bottom: 1px solid var(--line-soft);
}

.page-about .about-timeline__figure {
  margin: 0 0 clamp(26px, 4vw, 44px);
  border: 2px solid var(--line-soft);
  background: var(--deep-2);
  box-shadow: var(--shadow-cyan);
}

.page-about .about-timeline__figure img {
  filter: saturate(.9);
}

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

.page-about .tl-item {
  display: grid;
  grid-template-columns: var(--about-axis) minmax(0, 1fr);
  gap: 0 var(--about-gap);
  padding: 20px 0;
  border-bottom: 1px solid var(--line-soft);
  outline: none;
}

.page-about .tl-item:first-child {
  border-top: 1px solid var(--line-soft);
}

.page-about .tl-item__mark {
  position: relative;
  padding-left: 16px;
  border-left: 1px solid var(--cyan-line);
}

.page-about .tl-item__mark::before {
  content: "";
  position: absolute;
  left: -5px;
  top: 12px;
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--deep);
  border: 2px solid var(--cyan);
  transition: background .25s ease, border-color .25s ease, transform .25s ease;
}

.page-about .tl-year {
  display: block;
  color: var(--cyan);
  font-size: clamp(17px, 3vw, 26px);
  font-weight: 700;
  letter-spacing: -.02em;
}

.page-about .tl-item__body h3 {
  margin: 0 0 8px;
  color: var(--white);
  font-size: clamp(17px, 2.2vw, 21px);
  font-weight: 800;
  line-height: 1.35;
  letter-spacing: -.01em;
}

.page-about .tl-item__body > p {
  margin: 0;
  color: var(--silver);
  font-size: 15.5px;
  line-height: 1.75;
}

.page-about .tl-more {
  max-height: 0;
  opacity: 0;
  overflow: hidden;
  border-left: 2px solid var(--orange);
  padding-left: 0;
  transition: max-height .42s cubic-bezier(.4, 0, .2, 1), opacity .3s ease, margin-top .3s ease, padding-left .3s ease;
}

.page-about .tl-more p {
  margin: 0;
  color: rgba(192, 199, 209, .92);
  font-size: 15px;
  line-height: 1.75;
}

.page-about .tl-item:hover .tl-more,
.page-about .tl-item:focus-within .tl-more,
.page-about .tl-item:focus .tl-more {
  max-height: 320px;
  opacity: 1;
  margin-top: 12px;
  padding-left: 14px;
}

.page-about .tl-item:hover .tl-item__mark::before,
.page-about .tl-item:focus .tl-item__mark::before {
  background: var(--orange);
  border-color: var(--orange);
  transform: scale(1.25);
}

.page-about .tl-item:hover .tl-year,
.page-about .tl-item:focus .tl-year {
  color: var(--orange);
}

.page-about .tl-item:focus-visible {
  box-shadow: inset 0 0 0 2px var(--cyan-line);
}

/* ---------- 编辑分工 ---------- */
.page-about .about-teams__intro {
  display: grid;
  gap: clamp(20px, 3.5vw, 36px);
  align-items: center;
  margin-bottom: clamp(24px, 4vw, 36px);
}

.page-about .about-teams__intro h2 {
  margin: 10px 0 12px;
  color: var(--white);
  font-size: clamp(24px, 4.4vw, 40px);
  font-weight: 900;
  line-height: 1.14;
  letter-spacing: -.02em;
}

.page-about .about-teams__intro p {
  color: var(--silver);
  font-size: 16px;
  line-height: 1.75;
}

.page-about .about-teams__figure {
  margin: 0;
  border: 2px solid var(--line-soft);
  background: var(--deep-2);
  box-shadow: var(--shadow-orange);
}

.page-about .team-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 16px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .team-card {
  position: relative;
  display: flex;
  flex-direction: column;
  gap: 10px;
  padding: 22px 18px 18px;
  border: 2px solid var(--line-soft);
  background: var(--deep-2);
  outline: none;
  transition: transform .25s ease, border-color .25s ease, box-shadow .25s ease, background .25s ease;
}

.page-about .team-card::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 3px;
  background: linear-gradient(90deg, var(--cyan), var(--orange));
  opacity: .35;
  transition: opacity .25s ease;
}

.page-about .team-card__no {
  color: var(--cyan);
  font-size: 13px;
  letter-spacing: .18em;
}

.page-about .team-card h3 {
  margin: 0;
  color: var(--white);
  font-size: 18px;
  font-weight: 800;
  letter-spacing: -.01em;
}

.page-about .team-card p {
  margin: 0;
  flex: 1 1 auto;
  color: var(--silver);
  font-size: 15px;
  line-height: 1.72;
}

.page-about .team-card .tag {
  align-self: flex-start;
}

.page-about .team-card:hover,
.page-about .team-card:focus-visible,
.page-about .team-card:focus-within {
  transform: translateY(-4px);
  border-color: var(--cyan);
  background: rgba(0, 229, 255, .07);
  box-shadow: var(--shadow-cyan);
}

.page-about .team-card:hover::before,
.page-about .team-card:focus-visible::before {
  opacity: 1;
}

/* ---------- 更新节奏 ---------- */
.page-about .about-cadence {
  border-top: 1px solid var(--line-soft);
  border-bottom: 1px solid var(--line-soft);
  background:
    linear-gradient(180deg, rgba(18, 36, 74, .55) 0%, rgba(11, 27, 58, 0) 100%),
    var(--deep);
}

.page-about .about-head--split {
  display: grid;
  gap: 18px;
  align-items: end;
}

.page-about .cadence-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 14px;
}

.page-about .cadence-card {
  padding: 22px 20px;
  border: 1px solid var(--line-soft);
  border-left: 3px solid var(--orange);
  background: var(--deep-2);
  transition: border-left-color .25s ease, transform .25s ease;
}

.page-about .cadence-card:hover {
  border-left-color: var(--cyan);
  transform: translateY(-3px);
}

.page-about .cadence-card__num {
  display: block;
  margin-bottom: 10px;
  color: var(--cyan);
  font-size: clamp(20px, 3.4vw, 28px);
  font-weight: 700;
  letter-spacing: -.02em;
}

.page-about .cadence-card h3 {
  margin: 0 0 8px;
  color: var(--white);
  font-size: 17px;
  font-weight: 800;
}

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

/* ---------- 覆盖与协作 ---------- */
.page-about .about-network__grid {
  display: grid;
  gap: clamp(24px, 4vw, 44px);
  align-items: start;
  margin-bottom: clamp(24px, 4vw, 40px);
}

.page-about .about-network h2 {
  margin: 10px 0 14px;
  color: var(--white);
  font-size: clamp(24px, 4.4vw, 40px);
  font-weight: 900;
  line-height: 1.14;
  letter-spacing: -.02em;
}

.page-about .about-network p {
  color: var(--silver);
  font-size: 16px;
  line-height: 1.75;
}

.page-about .about-network__figure {
  margin: 0;
  border: 2px solid var(--line-soft);
  background: var(--deep-2);
  box-shadow: var(--shadow-cyan);
}

.page-about .stat-list {
  margin: clamp(20px, 3vw, 30px) 0 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 18px;
}

.page-about .stat {
  display: grid;
  gap: 4px;
}

.page-about .stat__num {
  color: var(--white);
  font-size: clamp(22px, 3.6vw, 30px);
  font-weight: 700;
  letter-spacing: -.02em;
}

.page-about .stat__label {
  color: var(--silver);
  font-size: 14px;
}

.page-about .stat-bar {
  display: block;
  height: 8px;
  margin-top: 8px;
  border: 1px solid var(--line-soft);
  background: rgba(192, 199, 209, .12);
}

.page-about .stat-bar__fill {
  display: block;
  width: var(--bar, 60%);
  height: 100%;
  transform-origin: left center;
  background: linear-gradient(90deg, var(--cyan) 0%, var(--orange) 100%);
  animation: about-bar-grow 1.1s cubic-bezier(.2, .8, .2, 1) both;
}

@keyframes about-bar-grow {
  from { transform: scaleX(0); }
  to { transform: scaleX(1); }
}

.page-about .partner-note {
  padding: clamp(22px, 4vw, 34px);
  border: 2px solid var(--cyan-line);
  background: var(--deep-2);
  box-shadow: var(--shadow-orange);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 22px), calc(100% - 22px) 100%, 0 100%);
}

.page-about .partner-note h3 {
  margin: 0 0 10px;
  color: var(--white);
  font-size: clamp(18px, 2.6vw, 23px);
  font-weight: 800;
  letter-spacing: -.01em;
}

.page-about .partner-note p {
  margin: 0;
  max-width: 68ch;
  color: var(--silver);
  font-size: 16px;
  line-height: 1.75;
}

.page-about .partner-note .btn-row {
  margin-top: 20px;
}

/* ---------- 结尾入口 ---------- */
.page-about .about-cta {
  background: var(--graphite);
  border-top: 1px solid var(--line-soft);
}

.page-about .about-cta__inner {
  position: relative;
  padding-left: clamp(0px, 2vw, 26px);
  border-left: 4px solid var(--orange);
}

.page-about .about-cta h2 {
  margin: 10px 0 12px;
  max-width: 26ch;
  color: var(--white);
  font-size: clamp(22px, 3.8vw, 34px);
  font-weight: 900;
  line-height: 1.16;
  letter-spacing: -.02em;
}

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

.page-about .about-cta .btn-row {
  margin-top: 22px;
}

/* ---------- 响应式 ---------- */
@media (min-width: 640px) {
  .page-about {
    --about-axis: 92px;
  }

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

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

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

@media (min-width: 900px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 1.4fr) minmax(276px, .6fr);
  }

  .page-about .about-teams__intro {
    grid-template-columns: minmax(0, 1fr) minmax(280px, 420px);
  }

  .page-about .about-network__grid {
    grid-template-columns: minmax(0, 1fr) minmax(280px, 400px);
  }

  .page-about .stat-list {
    gap: 22px;
  }
}

@media (min-width: 1080px) {
  .page-about .team-grid {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

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

@media (prefers-reduced-motion: reduce) {
  .page-about .stat-bar__fill {
    animation: none;
  }

  .page-about .tl-more,
  .page-about .team-card,
  .page-about .cadence-card,
  .page-about .tl-item__mark::before {
    transition: none;
  }

  .page-about .team-card:hover,
  .page-about .team-card:focus-visible,
  .page-about .cadence-card:hover {
    transform: none;
  }
}

.page-about {
  --bar: 1rem;
}