.page-about {
  --about-space: clamp(56px, 8vw, 116px);
  --about-pad: clamp(20px, 3.2vw, 44px);
  color: var(--white);
}

.page-about .breadcrumb {
  max-width: var(--max);
  margin: 0 auto;
  padding: clamp(16px, 2.4vw, 28px) var(--gutter) 0;
  font-size: 13px;
}

.page-about .breadcrumb ol {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  list-style: none;
  margin: 0;
  padding: 0;
}

.page-about .breadcrumb li {
  display: flex;
  align-items: center;
}

.page-about .breadcrumb li + li::before {
  content: "/";
  margin: 0 8px;
  color: var(--line);
}

.page-about .breadcrumb a {
  color: var(--muted);
  text-decoration: none;
  transition: color .2s var(--ease);
}

.page-about .breadcrumb a:hover,
.page-about .breadcrumb a:focus-visible {
  color: var(--gold);
}

.page-about .breadcrumb li[aria-current="page"] {
  color: var(--white);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  display: flex;
  align-items: flex-end;
  overflow: hidden;
  min-height: min(72vh, 620px);
  margin-bottom: var(--about-space);
  padding: 0;
  border: 0;
  border-radius: 0;
  background: var(--night);
}

.page-about .about-hero-img {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: .58;
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  inset: 0;
  background:
    radial-gradient(70% 55% at 50% 0%, rgba(42, 75, 124, .55), transparent 72%),
    linear-gradient(180deg, rgba(10, 20, 40, .25) 0%, rgba(10, 20, 40, .72) 58%, var(--night) 100%);
  pointer-events: none;
}

.page-about .about-hero-inner {
  position: relative;
  z-index: 2;
  width: 100%;
  padding-bottom: clamp(32px, 5vw, 60px);
}

.page-about .eyebrow {
  margin: 0 0 12px;
  font-size: 12px;
  font-weight: 700;
  letter-spacing: .16em;
  color: var(--gold);
}

.page-about .about-hero h1 {
  margin: 0 0 18px;
  max-width: 17em;
  font-size: clamp(29px, 5.2vw, 60px);
  font-weight: 900;
  line-height: 1.08;
  letter-spacing: -.02em;
  text-wrap: balance;
}

.page-about .hero-lede {
  margin: 0;
  max-width: 62ch;
  font-size: clamp(15px, 1.4vw, 17px);
  line-height: 1.85;
  color: rgba(243, 246, 251, .86);
}

.page-about .hero-stats {
  display: flex;
  flex-wrap: wrap;
  gap: clamp(18px, 3.4vw, 44px);
  margin: clamp(22px, 3vw, 36px) 0 0;
  padding: 18px 0 0;
  list-style: none;
  border-top: 1px solid rgba(38, 56, 92, .9);
}

.page-about .hero-stat strong {
  display: block;
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: clamp(19px, 2.3vw, 28px);
  font-weight: 700;
  line-height: 1.1;
  color: var(--gold);
}

.page-about .hero-stat span {
  display: block;
  margin-top: 6px;
  font-size: 12px;
  letter-spacing: .1em;
  color: var(--muted);
}

/* ---------- 通用画板 ---------- */
.page-about .about-block {
  margin-bottom: var(--about-space);
  padding: var(--about-pad);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--panel);
}

.page-about .about-head {
  margin-bottom: clamp(20px, 3vw, 34px);
}

.page-about .panel-title {
  margin: 0 0 14px;
  font-size: clamp(21px, 2.6vw, 32px);
  font-weight: 700;
  line-height: 1.22;
  letter-spacing: -.01em;
  color: var(--white);
}

.page-about .about-head .about-copy {
  margin-top: 4px;
}

.page-about .about-copy {
  max-width: 66ch;
  font-size: 15px;
  line-height: 1.85;
  color: rgba(243, 246, 251, .84);
}

.page-about .about-copy p {
  margin: 0 0 1em;
}

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

/* ---------- 起点 ---------- */
.page-about .origin-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(20px, 3vw, 40px);
}

.page-about .origin-note {
  padding-left: 18px;
  border-left: 3px solid var(--gold);
}

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

.page-about .fact-list li {
  display: flex;
  align-items: baseline;
  gap: 14px;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--line);
}

.page-about .fact-list li:last-child {
  padding-bottom: 0;
  border-bottom: 0;
}

.page-about .fact-list .num {
  flex: 0 0 auto;
  min-width: 4ch;
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: clamp(20px, 2.2vw, 26px);
  font-weight: 700;
  color: var(--gold);
}

.page-about .fact-list li span:last-child {
  font-size: 13px;
  line-height: 1.6;
  color: var(--muted);
}

/* ---------- 团队 ---------- */
.page-about .team-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(24px, 3.4vw, 44px);
}

.page-about .team-figure {
  margin: 0;
  overflow: hidden;
  border-radius: 12px;
}

.page-about .team-figure img,
.page-about .bridge-figure img,
.page-about .about-hero-img {
  max-width: 100%;
  height: auto;
}

.page-about .team-figure img {
  display: block;
  width: 100%;
}

.page-about .team-cards {
  display: grid;
  gap: 14px;
}

.page-about .team-card {
  position: relative;
  padding: 18px 20px 18px 24px;
  border: 1px solid var(--line);
  border-radius: 12px;
  background: var(--glass);
  transition: transform .3s var(--ease), border-color .3s var(--ease), background .3s var(--ease);
}

.page-about .team-card::before {
  content: "";
  position: absolute;
  left: 0;
  top: 16px;
  bottom: 16px;
  width: 3px;
  border-radius: 3px;
  background: var(--accent, var(--gold));
}

.page-about .team-card:nth-child(2) {
  --accent: var(--red);
}

.page-about .team-card:nth-child(3) {
  --accent: var(--green);
}

.page-about .team-card:hover,
.page-about .team-card:focus,
.page-about .team-card:focus-within {
  transform: translateY(-2px);
  border-color: rgba(245, 194, 74, .55);
  background: rgba(31, 55, 96, .92);
}

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

.page-about .team-idx {
  display: inline-block;
  margin-bottom: 8px;
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: 12px;
  letter-spacing: .1em;
  color: var(--accent, var(--gold));
}

.page-about .team-card h3 {
  margin: 0 0 8px;
  font-size: 17px;
  font-weight: 700;
  line-height: 1.3;
  color: var(--white);
}

.page-about .team-card > p {
  margin: 0;
  font-size: 14px;
  line-height: 1.75;
  color: rgba(243, 246, 251, .78);
}

.page-about .team-more {
  max-height: 0;
  margin-top: 0;
  overflow: hidden;
  opacity: 0;
  transition: max-height .45s var(--ease), opacity .3s var(--ease), margin-top .3s var(--ease);
}

.page-about .team-more p {
  margin: 0;
  padding-top: 12px;
  border-top: 1px solid var(--line);
  font-size: 13px;
  line-height: 1.75;
  color: var(--muted);
}

.page-about .team-card:hover .team-more,
.page-about .team-card:focus .team-more,
.page-about .team-card:focus-within .team-more {
  max-height: 240px;
  margin-top: 12px;
  opacity: 1;
}

.page-about .team-note {
  margin-top: clamp(22px, 3vw, 34px);
  padding-top: clamp(18px, 2.4vw, 26px);
  border-top: 1px solid var(--line);
  font-size: 14px;
}

/* ---------- 数据节奏 ---------- */
.page-about .flow {
  margin: clamp(22px, 3vw, 36px) 0 clamp(24px, 3.4vw, 40px);
  padding: clamp(18px, 2.6vw, 28px) clamp(16px, 2.4vw, 28px) clamp(14px, 2vw, 20px);
  border: 1px solid var(--line);
  border-radius: 12px;
  background: rgba(10, 20, 40, .5);
}

.page-about .flow-scale {
  display: block;
  width: 100%;
  height: auto;
}

.page-about .flow-steps {
  display: flex;
  justify-content: space-between;
  gap: 10px;
  margin: 10px 0 0;
  padding: 0;
  list-style: none;
}

.page-about .flow-step {
  flex: 1 1 0;
  min-width: 0;
}

.page-about .flow-step:nth-child(2) {
  text-align: center;
}

.page-about .flow-step:nth-child(3) {
  text-align: right;
}

.page-about .flow-num {
  display: block;
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: clamp(14px, 1.6vw, 18px);
  font-weight: 700;
  color: var(--blue);
}

.page-about .flow-step:nth-child(2) .flow-num {
  color: var(--gold);
}

.page-about .flow-step:nth-child(3) .flow-num {
  color: var(--green);
}

.page-about .flow-label {
  display: block;
  margin-top: 6px;
  font-size: 12px;
  line-height: 1.6;
  color: var(--muted);
}

.page-about .cadence {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 16px;
}

.page-about .cadence-item {
  padding: 18px 20px;
  border-radius: 12px;
  border: 1px solid var(--line);
  border-top: 3px solid var(--blue);
  background: rgba(19, 36, 67, .78);
}

.page-about .cadence-item--table {
  border-top-color: var(--gold);
}

.page-about .cadence-item h3 {
  margin: 0 0 8px;
  font-size: 15px;
  font-weight: 700;
  letter-spacing: .02em;
  color: var(--white);
}

.page-about .cadence-item p {
  margin: 0;
  font-size: 14px;
  line-height: 1.8;
  color: rgba(243, 246, 251, .78);
}

/* ---------- 过渡图 ---------- */
.page-about .bridge-figure {
  position: relative;
  margin: 0 0 var(--about-space);
  overflow: hidden;
  border-radius: var(--radius);
  border: 1px solid var(--line);
}

.page-about .bridge-figure img {
  display: block;
  width: 100%;
  object-fit: cover;
}

.page-about .bridge-figure figcaption {
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  padding: 20px 20px 16px;
  font-size: 12px;
  line-height: 1.6;
  color: var(--muted);
  background: linear-gradient(180deg, rgba(10, 20, 40, 0) 0%, rgba(10, 20, 40, .92) 100%);
}

/* ---------- 年表 ---------- */
.page-about .timeline {
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .tl-item {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 10px;
  padding: clamp(20px, 2.6vw, 30px) 0;
  border-top: 1px solid var(--line);
}

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

.page-about .tl-mark {
  display: flex;
  align-items: baseline;
  gap: 10px;
}

.page-about .tl-mark .num {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: clamp(21px, 2.6vw, 28px);
  font-weight: 700;
  line-height: 1;
  color: var(--gold);
}

.page-about .tl-mark span:last-child {
  font-size: 11px;
  letter-spacing: .14em;
  color: var(--muted);
}

.page-about .tl-title {
  margin: 0 0 10px;
  font-size: clamp(16px, 1.9vw, 21px);
  font-weight: 700;
  line-height: 1.35;
  color: var(--white);
}

.page-about .tl-title time {
  display: block;
  margin-bottom: 6px;
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 600;
  letter-spacing: .1em;
  color: var(--blue);
}

.page-about .tl-details summary {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 0;
  font-size: 13px;
  color: var(--blue);
  cursor: pointer;
  list-style: none;
}

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

.page-about .tl-details summary::after {
  content: "▾";
  font-size: 12px;
  transition: transform .25s var(--ease);
}

.page-about .tl-details[open] summary::after {
  transform: rotate(180deg);
}

.page-about .tl-details summary:focus-visible {
  outline: 2px solid var(--gold);
  outline-offset: 2px;
  border-radius: 4px;
}

.page-about .tl-details p {
  margin: 10px 0 0;
  max-width: 62ch;
  font-size: 14px;
  line-height: 1.85;
  color: rgba(243, 246, 251, .78);
}

/* ---------- 合作生态 ---------- */
.page-about .cloud {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin: clamp(10px, 2vw, 20px) 0 clamp(24px, 3vw, 34px);
  padding: 0;
  list-style: none;
}

.page-about .cloud-tag {
  padding: 7px 15px;
  font-size: 13px;
  line-height: 1.4;
  color: var(--muted);
  border: 1px solid var(--line);
  border-radius: 999px;
  background: rgba(10, 20, 40, .45);
}

.page-about .cloud-tag--md {
  padding: 9px 18px;
  font-size: 14px;
  color: var(--white);
  border-color: rgba(91, 141, 239, .5);
  background: rgba(91, 141, 239, .12);
}

.page-about .cloud-tag--lg {
  padding: 11px 22px;
  font-size: 15px;
  font-weight: 700;
  color: var(--night);
  border-color: var(--gold);
  background: var(--gold);
}

/* ---------- 结尾 ---------- */
.page-about .about-end {
  background: linear-gradient(160deg, rgba(42, 75, 124, .42) 0%, rgba(19, 36, 67, .95) 62%);
}

.page-about .about-cta {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  align-items: center;
  margin-top: clamp(18px, 2.4vw, 26px);
}

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

  .page-about .about-copy {
    font-size: 16px;
  }
}

@media (min-width: 820px) {
  .page-about .tl-item {
    grid-template-columns: 108px minmax(0, 1fr);
    gap: clamp(20px, 3vw, 44px);
  }

  .page-about .tl-mark {
    position: sticky;
    top: 88px;
    align-self: start;
    flex-direction: column;
    align-items: flex-start;
    gap: 6px;
  }
}

@media (min-width: 900px) {
  .page-about .origin-grid {
    grid-template-columns: minmax(0, 1.55fr) minmax(0, 1fr);
  }

  .page-about .team-cards {
    gap: 18px;
  }

  .page-about .team-card:nth-child(2) {
    margin-left: 24px;
  }

  .page-about .team-card:nth-child(3) {
    margin-left: 48px;
  }
}

@media (min-width: 1024px) {
  .page-about .team-layout {
    grid-template-columns: minmax(0, .82fr) minmax(0, 1.18fr);
    align-items: start;
  }

  .page-about .about-block {
    padding: clamp(28px, 3.4vw, 48px);
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .team-card,
  .page-about .team-more,
  .page-about .tl-details summary::after,
  .page-about .breadcrumb a {
    transition: none;
  }

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