.page-about .about-crumb ol {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  margin: 0 0 26px;
  padding: 0;
  list-style: none;
  font-size: 13px;
  letter-spacing: .04em;
  color: var(--muted);
}

.page-about .about-crumb a {
  color: var(--muted);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color .2s ease, border-color .2s ease;
}

.page-about .about-crumb a:hover {
  color: var(--cyan);
  border-bottom-color: var(--line-strong);
}

.page-about .about-crumb li + li::before {
  content: "/";
  margin-right: 8px;
  opacity: .55;
}

/* ---------- 首屏 ---------- */

.page-about .about-hero {
  padding-top: clamp(20px, 4vw, 44px);
}

.page-about .about-hero__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(26px, 5vw, 52px);
  align-items: end;
}

.page-about .about-hero__copy h1 {
  margin: 14px 0 20px;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(32px, 7vw, 56px);
  line-height: 1.05;
  letter-spacing: -.02em;
  color: var(--paper);
}

.page-about .about-hero__copy .lead {
  max-width: 34em;
  margin: 0;
  font-size: clamp(16px, 1.7vw, 19px);
  line-height: 1.85;
  color: var(--paper);
  opacity: .84;
}

.page-about .about-hero__note {
  margin: 18px 0 0;
  padding-left: 16px;
  border-left: 2px solid var(--gold);
  font-size: 15px;
  line-height: 1.8;
  color: var(--muted);
  max-width: 32em;
}

.page-about .about-hero__figure {
  position: relative;
  margin: 0;
  aspect-ratio: 3 / 2;
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  overflow: hidden;
  background: var(--ink-2);
}

.page-about .about-hero__figure .media__img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.page-about .about-hero__figure .media__caption {
  position: absolute;
  left: 18px;
  right: 18px;
  bottom: 16px;
  font-size: 12px;
  letter-spacing: .08em;
  color: var(--mint);
  text-shadow: 0 2px 12px rgba(0, 0, 0, .8);
}

.page-about .about-stats {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 0;
  margin: clamp(32px, 5vw, 56px) 0 0;
  padding: 0;
  list-style: none;
  border-top: 1px solid var(--line);
}

.page-about .about-stats li {
  padding: 22px 0;
  border-bottom: 1px solid var(--line);
}

/* ---------- 通用小节导语 ---------- */

.page-about .about-section__lead {
  margin: 14px 0 0;
  max-width: 38em;
  font-size: 16px;
  line-height: 1.85;
  color: var(--muted);
}

/* ---------- 编辑组分工 ---------- */

.page-about .about-roles {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 18px;
  margin-top: clamp(28px, 4vw, 46px);
}

.page-about .about-role {
  position: relative;
  padding: 28px 24px 24px;
  background: var(--ink-2);
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
  transition: transform .25s ease, border-color .25s ease, box-shadow .25s ease;
}

.page-about .about-role:hover {
  transform: translateY(-4px);
  border-color: var(--line-strong);
  box-shadow: var(--shadow-card);
}

.page-about .about-role__num {
  display: block;
  font-family: var(--font-mono);
  font-size: 40px;
  font-weight: 700;
  line-height: 1;
  letter-spacing: -.03em;
  color: var(--cyan);
}

.page-about .about-role__title {
  margin: 16px 0 10px;
  font-family: var(--font-display);
  font-size: 22px;
  font-weight: 900;
  letter-spacing: -.01em;
  color: var(--paper);
}

.page-about .about-role__text {
  margin: 0;
  font-size: 15.5px;
  line-height: 1.85;
  color: #b9cbc4;
}

.page-about .about-role__meta {
  margin: 18px 0 0;
  padding-top: 14px;
  border-top: 1px solid var(--line);
  font-family: var(--font-mono);
  font-size: 12.5px;
  line-height: 1.7;
  color: var(--muted);
}

/* ---------- 数据来源 ---------- */

.page-about .about-source {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(26px, 4vw, 48px);
  margin-top: clamp(26px, 4vw, 44px);
  align-items: start;
}

.page-about .about-source__item {
  display: grid;
  grid-template-columns: 48px minmax(0, 1fr);
  gap: 16px;
  padding: 20px 0;
  border-top: 1px solid var(--line);
}

.page-about .about-source__item:last-of-type {
  border-bottom: 1px solid var(--line);
}

.page-about .about-source__no {
  font-family: var(--font-mono);
  font-size: 18px;
  font-weight: 700;
  line-height: 1.6;
  color: var(--gold);
  letter-spacing: .04em;
}

.page-about .about-source__item h3 {
  margin: 0 0 8px;
  font-family: var(--font-display);
  font-size: 19px;
  font-weight: 900;
  color: var(--paper);
}

.page-about .about-source__item p {
  margin: 0;
  font-size: 15.5px;
  line-height: 1.85;
  color: #b9cbc4;
}

.page-about .about-source__foot {
  margin: 22px 0 0;
  padding: 18px 20px;
  border-radius: var(--radius-sm);
  background: var(--ink-blue);
  font-size: 15px;
  line-height: 1.85;
  color: var(--mint);
}

.page-about .about-source__aside {
  display: grid;
  gap: 22px;
}

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

.page-about .about-flow__box {
  fill: var(--ink-blue);
  stroke: var(--line);
  stroke-width: 1.5;
}

.page-about .about-flow__step {
  fill: var(--paper);
  font-family: var(--font-display);
  font-size: 26px;
  font-weight: 700;
  letter-spacing: .02em;
}

.page-about .about-flow__desc {
  fill: var(--muted);
  font-family: var(--font-body);
  font-size: 16px;
}

.page-about .about-flow__arrow {
  stroke: var(--line-strong);
  stroke-width: 2;
  stroke-linecap: round;
  fill: none;
}

.page-about .about-flow__head {
  fill: var(--cyan);
}

.page-about .about-source__figure {
  position: relative;
  margin: 0;
  aspect-ratio: 4 / 3;
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
  overflow: hidden;
  background: var(--ink-2);
}

.page-about .about-source__figure .media__img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.page-about .about-source__figure .media__caption {
  position: absolute;
  left: 16px;
  right: 16px;
  bottom: 14px;
  font-size: 12px;
  letter-spacing: .06em;
  color: var(--mint);
  text-shadow: 0 2px 12px rgba(0, 0, 0, .8);
}

/* ---------- 时间轴 ---------- */

.page-about .about-tl {
  position: relative;
  margin: clamp(30px, 4vw, 52px) 0 0;
  padding: 0;
  list-style: none;
}

.page-about .about-tl::before {
  content: "";
  position: absolute;
  left: 7px;
  top: 10px;
  bottom: 10px;
  width: 1px;
  background: var(--line);
}

.page-about .about-tl__item {
  position: relative;
  padding: 0 0 22px 38px;
}

.page-about .about-tl__item::before {
  content: "";
  position: absolute;
  left: 7px;
  top: 9px;
  width: 11px;
  height: 11px;
  border-radius: 50%;
  background: var(--cyan);
  transform: translateX(-50%);
  box-shadow: 0 0 0 3px var(--ink-blue), 0 0 14px rgba(53, 240, 200, .55);
}

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

.page-about .about-tl__year {
  display: block;
  margin-bottom: 8px;
  font-family: var(--font-mono);
  font-size: 24px;
  font-weight: 700;
  letter-spacing: -.02em;
  color: var(--gold);
}

.page-about .about-tl__node {
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
  background: rgba(18, 22, 26, .72);
  transition: border-color .25s ease;
}

.page-about .about-tl__node[open] {
  border-color: var(--line-strong);
}

.page-about .about-tl__summary {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 16px 18px;
  cursor: pointer;
  list-style: none;
}

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

.page-about .about-tl__title {
  font-family: var(--font-display);
  font-size: 17px;
  font-weight: 700;
  line-height: 1.5;
  color: var(--paper);
}

.page-about .about-tl__chev {
  position: relative;
  flex: 0 0 18px;
  width: 18px;
  height: 18px;
}

.page-about .about-tl__chev::before,
.page-about .about-tl__chev::after {
  content: "";
  position: absolute;
  background: var(--cyan);
  border-radius: 2px;
}

.page-about .about-tl__chev::before {
  left: 0;
  right: 0;
  top: 8px;
  height: 2px;
}

.page-about .about-tl__chev::after {
  top: 0;
  bottom: 0;
  left: 8px;
  width: 2px;
  transition: transform .25s ease;
}

.page-about .about-tl__node[open] .about-tl__chev::after {
  transform: scaleY(0);
}

.page-about .about-tl__body {
  padding: 0 18px 18px;
  border-top: 1px solid var(--line);
}

.page-about .about-tl__body p {
  margin: 16px 0 0;
  font-size: 15.5px;
  line-height: 1.9;
  color: #b9cbc4;
}

/* ---------- 合作生态 ---------- */

.page-about .about-partners {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 16px;
  margin-top: clamp(28px, 4vw, 44px);
}

.page-about .about-partner {
  padding: 24px 22px;
  border: 1px solid var(--line);
  border-left: 3px solid var(--line-strong);
  border-radius: var(--radius-md);
  background: var(--ink-2);
  transition: transform .25s ease, border-color .25s ease, background .25s ease;
}

.page-about .about-partner:hover {
  transform: translateY(-4px) scale(1.015);
  border-left-color: var(--gold);
  background: #172019;
}

.page-about .about-partner__type {
  margin: 0;
  font-size: 12px;
  letter-spacing: .14em;
  color: var(--muted);
}

.page-about .about-partner__num {
  margin: 12px 0 12px;
  font-family: var(--font-mono);
  font-size: 40px;
  font-weight: 700;
  line-height: 1;
  letter-spacing: -.03em;
  color: var(--cyan);
}

.page-about .about-partner__num span {
  margin-left: 6px;
  font-family: var(--font-body);
  font-size: 15px;
  font-weight: 500;
  color: var(--muted);
}

.page-about .about-partner__text {
  margin: 0;
  font-size: 15px;
  line-height: 1.85;
  color: #b9cbc4;
}

.page-about .about-partner__figure {
  position: relative;
  margin: clamp(28px, 4vw, 44px) 0 0;
  aspect-ratio: 2 / 1;
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  overflow: hidden;
  background: var(--ink-2);
}

.page-about .about-partner__figure .media__img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.page-about .about-partner__figure .media__caption {
  position: absolute;
  left: 18px;
  right: 18px;
  bottom: 16px;
  font-size: 12px;
  letter-spacing: .06em;
  color: var(--mint);
  text-shadow: 0 2px 12px rgba(0, 0, 0, .8);
}

.page-about .about-partner__foot {
  margin: 24px 0 0;
  max-width: 42em;
  font-size: 15.5px;
  line-height: 1.9;
  color: var(--muted);
}

.page-about .about-partner__foot a {
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid var(--line-strong);
}

.page-about .about-partner__foot a:hover {
  color: var(--gold);
  border-bottom-color: var(--line-gold);
}

/* ---------- 内容标准 ---------- */

.page-about .about-standards {
  margin: clamp(28px, 4vw, 46px) 0 0;
  padding: 0;
  list-style: none;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 0;
}

.page-about .about-standards__item {
  display: grid;
  grid-template-columns: 56px minmax(0, 1fr);
  gap: 18px;
  padding: 26px 0;
  border-top: 1px solid var(--line);
}

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

.page-about .about-standards__no {
  font-family: var(--font-mono);
  font-size: 30px;
  font-weight: 700;
  line-height: 1.2;
  letter-spacing: -.03em;
  color: var(--cyan);
  opacity: .85;
}

.page-about .about-standards__body h3 {
  margin: 0 0 10px;
  font-family: var(--font-display);
  font-size: 20px;
  font-weight: 900;
  color: var(--paper);
}

.page-about .about-standards__body p {
  margin: 0;
  font-size: 15.5px;
  line-height: 1.9;
  color: #b9cbc4;
}

/* ---------- 结尾跳转 ---------- */

.page-about .about-cta {
  display: grid;
  gap: 20px;
  margin-top: clamp(32px, 5vw, 56px);
  padding: clamp(24px, 4vw, 36px);
  border: 1px solid var(--line-gold);
  border-radius: var(--radius-lg);
  background: linear-gradient(135deg, rgba(20, 36, 58, .9), rgba(11, 31, 26, .9));
}

.page-about .about-cta__text {
  margin: 0;
  max-width: 40em;
  font-size: 16px;
  line-height: 1.9;
  color: var(--paper);
  opacity: .88;
}

.page-about .about-cta__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

/* ---------- 响应式 ---------- */

@media (min-width: 720px) {
  .page-about .about-stats {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .page-about .about-stats li {
    padding: 22px 26px;
    border-bottom: 0;
    border-left: 1px solid var(--line);
  }

  .page-about .about-stats li:first-child {
    padding-left: 0;
    border-left: 0;
  }

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

@media (min-width: 820px) {
  .page-about .about-tl::before {
    left: 139px;
  }

  .page-about .about-tl__item {
    display: grid;
    grid-template-columns: 120px minmax(0, 1fr);
    gap: 38px;
    padding: 0 0 28px 0;
  }

  .page-about .about-tl__item::before {
    left: 139px;
  }

  .page-about .about-tl__year {
    margin: 12px 0 0;
    text-align: right;
    font-size: 28px;
  }
}

@media (min-width: 960px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
  }

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

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

  .page-about .about-standards__item {
    grid-template-columns: 88px minmax(0, 1fr);
    gap: 32px;
    padding: 32px 0;
  }

  .page-about .about-cta {
    grid-template-columns: minmax(0, 1fr) auto;
    align-items: center;
    gap: 32px;
  }
}

@media (min-width: 1180px) {
  .page-about .about-hero__figure {
    margin-bottom: -34px;
  }

  .page-about .about-partners {
    gap: 22px;
  }

  .page-about .about-partners .about-partner:nth-child(2) {
    transform: translateY(22px);
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-role,
  .page-about .about-partner,
  .page-about .about-tl__node,
  .page-about .about-tl__chev::after {
    transition: none;
  }

  .page-about .about-role:hover,
  .page-about .about-partner:hover {
    transform: none;
  }
}