.page-about {
  --about-index-w: 170px;
  --about-rail-w: 268px;
  background: var(--paper);
  color: var(--ink);
}

.page-about .about-crumb {
  padding-top: 26px;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  padding: 28px 0 60px;
  overflow: hidden;
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  top: -70px;
  right: -8%;
  width: 54%;
  height: 330px;
  background: var(--ochre);
  opacity: .07;
  transform: skewX(-12deg);
  pointer-events: none;
}

.page-about .about-hero-inner {
  position: relative;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 34px;
}

@media (min-width: 900px) {
  .page-about .about-hero-inner {
    grid-template-columns: minmax(0, 1.02fr) minmax(0, .98fr);
    gap: 54px;
    align-items: center;
  }
}

.page-about .about-hero-copy {
  min-width: 0;
}

.page-about .about-hero-title {
  margin: 14px 0 0;
  font-family: var(--font-cn);
  font-weight: 800;
  font-size: clamp(38px, 6.4vw, 104px);
  line-height: .98;
  letter-spacing: -.02em;
  color: var(--ink);
}

.page-about .about-hero-title em {
  display: block;
  font-style: normal;
  color: var(--ochre);
}

.page-about .about-hero-lede {
  margin: 24px 0 0;
  max-width: 30em;
  font-size: 17px;
  line-height: 1.78;
  color: var(--ink-80);
}

.page-about .about-hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 28px;
}

.page-about .about-hero-figure {
  position: relative;
  margin: 0;
  min-width: 0;
}

.page-about .about-hero-figure::before {
  content: "";
  position: absolute;
  top: 16px;
  right: -16px;
  bottom: -16px;
  left: 16px;
  border: 1px solid var(--ochre);
  border-radius: var(--radius);
  pointer-events: none;
}

.page-about .about-hero-media {
  position: relative;
  z-index: 1;
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: var(--shadow-2);
}

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

.page-about .media-caption {
  margin-top: 12px;
  font-size: 12.5px;
  line-height: 1.6;
  color: var(--ink-55);
}

/* ---------- 主体三栏 ---------- */
.page-about .about-main {
  border-top: 1px solid var(--line);
}

.page-about .about-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 30px;
  padding-top: 34px;
  padding-bottom: 68px;
}

@media (min-width: 1120px) {
  .page-about .about-layout {
    grid-template-columns: var(--about-index-w) minmax(0, 1fr) var(--about-rail-w);
    gap: 0 36px;
    padding-top: 50px;
    padding-bottom: 96px;
    align-items: start;
  }
}

/* 小节索引 */
.page-about .about-index {
  border-top: 2px solid var(--ink);
  padding-top: 12px;
}

@media (min-width: 1120px) {
  .page-about .about-index {
    position: sticky;
    top: 84px;
  }
}

.page-about .about-index-list {
  list-style: none;
  margin: 10px 0 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

@media (min-width: 1120px) {
  .page-about .about-index-list {
    flex-direction: column;
    gap: 0;
    margin-top: 14px;
  }
}

.page-about .about-index-list a {
  display: block;
  position: relative;
  padding: 6px 12px;
  font-size: 12.5px;
  line-height: 1.5;
  color: var(--ink-70);
  text-decoration: none;
  border: 1px solid var(--line-strong);
  border-radius: var(--radius);
}

@media (min-width: 1120px) {
  .page-about .about-index-list a {
    border: 0;
    border-left: 1px solid var(--line);
    border-radius: 0;
    padding: 9px 0 9px 16px;
    font-size: 13px;
  }
}

.page-about .about-index-list a::before {
  display: none;
}

@media (min-width: 1120px) {
  .page-about .about-index-list a::before {
    display: block;
    content: "";
    position: absolute;
    left: -3px;
    top: 50%;
    width: 5px;
    height: 5px;
    border-radius: 50%;
    background: var(--line-strong);
    transform: translateY(-50%);
    transition: background .18s ease-out;
  }
}

.page-about .about-index-list a:hover {
  color: var(--ink);
  border-color: var(--ochre);
}

@media (min-width: 1120px) {
  .page-about .about-index-list a:hover {
    border-color: transparent;
    border-left-color: var(--ochre);
  }
}

.page-about .about-index-list a.is-active {
  color: var(--ink);
  font-weight: 600;
}

@media (max-width: 1119px) {
  .page-about .about-index-list a.is-active {
    border-color: var(--ochre);
    background: rgba(194, 90, 51, .08);
  }
}

@media (min-width: 1120px) {
  .page-about .about-index-list a.is-active {
    border-left-color: var(--ink);
  }
  .page-about .about-index-list a.is-active::before {
    background: var(--gold);
  }
}

/* ---------- 正文流 ---------- */
.page-about .about-flow {
  min-width: 0;
}

.page-about .about-chapter {
  padding: 42px 0;
  border-top: 1px solid var(--line);
}

.page-about .about-flow > .about-chapter:first-child {
  border-top: 0;
  padding-top: 0;
}

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

.page-about .about-chapter-head {
  margin-bottom: 22px;
}

.page-about .section-index {
  margin: 0 0 10px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .14em;
  color: var(--ochre);
  text-transform: uppercase;
}

.page-about .about-chapter .section-title {
  margin: 0;
  font-family: var(--font-cn);
  font-weight: 800;
  font-size: clamp(25px, 3.4vw, 38px);
  line-height: 1.16;
  letter-spacing: -.01em;
  color: var(--ink);
}

.page-about .about-chapter .section-lede {
  margin: 14px 0 0;
  max-width: 36em;
  font-size: 16.5px;
  line-height: 1.72;
  color: var(--ink-70);
}

.page-about .prose p {
  margin: 0 0 1.1em;
  font-size: 17px;
  line-height: 1.78;
  color: var(--ink-80);
}

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

/* 引言 */
.page-about .about-quote {
  margin: 30px 0 0;
  padding: 6px 0 6px 22px;
  border-left: 3px solid var(--ochre);
}

.page-about .about-quote p {
  margin: 0;
  font-family: var(--font-cn);
  font-weight: 600;
  font-size: clamp(19px, 2.3vw, 25px);
  line-height: 1.5;
  color: var(--ink);
}

.page-about .about-quote cite {
  display: block;
  margin-top: 14px;
  font-family: var(--font-mono);
  font-style: normal;
  font-size: 12px;
  letter-spacing: .1em;
  color: var(--ink-55);
}

/* 方法 */
.page-about .about-method-top {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 24px;
}

@media (min-width: 720px) {
  .page-about .about-method-top {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, .95fr);
    gap: 30px;
    align-items: start;
  }
}

.page-about .about-method-figure {
  margin: 0;
}

.page-about .about-method-figure .media {
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: var(--shadow-1);
}

.page-about .about-sub-title {
  margin: 34px 0 0;
  font-size: 16px;
  font-weight: 600;
  letter-spacing: .01em;
  color: var(--ink);
}

.page-about .about-sub-title::before {
  content: "";
  display: inline-block;
  width: 18px;
  height: 2px;
  margin-right: 10px;
  vertical-align: 4px;
  background: var(--ocean);
}

.page-about .about-source-list {
  list-style: none;
  margin: 12px 0 0;
  padding: 0;
}

.page-about .about-source-list li {
  display: grid;
  grid-template-columns: 30px minmax(0, 1fr);
  gap: 14px;
  padding: 16px 0;
  border-top: 1px solid var(--line);
}

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

.page-about .src-num {
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: .08em;
  color: var(--ochre);
  padding-top: 2px;
}

.page-about .about-source-list strong {
  display: block;
  margin-bottom: 5px;
  font-size: 16px;
  font-weight: 600;
  color: var(--ink);
}

.page-about .about-source-list p {
  margin: 0;
  font-size: 15px;
  line-height: 1.7;
  color: var(--ink-70);
}

.page-about .about-verify {
  list-style: none;
  margin: 18px 0 0 4px;
  padding: 0 0 0 22px;
  border-left: 1px solid var(--line-strong);
}

.page-about .about-verify li {
  position: relative;
  padding-bottom: 20px;
  font-size: 15.5px;
  line-height: 1.72;
  color: var(--ink-70);
}

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

.page-about .about-verify li::before {
  content: "";
  position: absolute;
  left: -27px;
  top: 6px;
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--paper);
  border: 2px solid var(--ocean);
}

.page-about .about-verify strong {
  color: var(--ink);
  font-weight: 600;
}

/* 地图 */
.page-about .about-map-wrap {
  margin-top: 6px;
  padding: 26px;
  background: var(--ink);
  border-radius: var(--radius);
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 26px;
}

@media (min-width: 760px) {
  .page-about .about-map-wrap {
    grid-template-columns: minmax(0, 1.15fr) minmax(0, .85fr);
    gap: 36px;
    align-items: center;
    padding: 34px 38px;
  }
}

.page-about .about-map {
  margin: 0;
  min-width: 0;
}

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

.page-about .map-land {
  fill: rgba(16, 85, 127, .24);
  stroke: rgba(246, 241, 231, .38);
  stroke-width: 1.3;
  stroke-linejoin: round;
}

.page-about .map-ring {
  fill: none;
  stroke: var(--gold);
  stroke-width: 1;
  opacity: .5;
}

.page-about .map-dot {
  fill: var(--gold);
}

.page-about .map-label {
  font-family: var(--font-mono);
  font-size: 10.5px;
  letter-spacing: .08em;
  fill: rgba(246, 241, 231, .74);
}

.page-about .about-map-notes p {
  margin: 0 0 1em;
  font-size: 15.5px;
  line-height: 1.78;
  color: var(--on-ink);
}

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

/* 团队 */
.page-about .about-team-cards {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 16px;
  margin-top: 26px;
}

@media (min-width: 680px) {
  .page-about .about-team-cards {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

.page-about .about-team-card {
  padding: 22px 22px 24px;
  background: var(--wave);
  border: 1px solid rgba(16, 85, 127, .14);
  border-radius: var(--radius);
}

.page-about .team-num {
  margin: 0;
  font-family: var(--font-en);
  font-weight: 800;
  font-size: clamp(40px, 5vw, 54px);
  line-height: 1;
  letter-spacing: -.03em;
  color: var(--ocean);
}

.page-about .team-role {
  margin: 14px 0 0;
  font-size: 16px;
  font-weight: 600;
  color: var(--ink);
}

.page-about .team-note {
  margin: 8px 0 0;
  font-size: 14.5px;
  line-height: 1.7;
  color: var(--ink-70);
}

.page-about .about-cadence {
  display: flex;
  flex-wrap: wrap;
  gap: 10px 28px;
  margin-top: 20px;
  padding-top: 18px;
  border-top: 1px solid var(--line);
}

.page-about .about-cadence p {
  margin: 0;
  display: inline-flex;
  align-items: center;
  gap: 9px;
  font-size: 13.5px;
  color: var(--ink-70);
}

.page-about .cadence-dot {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--signal);
}

.page-about .cadence-dot--ocean {
  background: var(--ocean);
}

/* 伙伴 */
.page-about .about-partner-list {
  list-style: none;
  margin: 28px 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
}

@media (min-width: 560px) {
  .page-about .about-partner-list {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

.page-about .about-partner-list li {
  background: var(--paper);
  padding: 20px 18px;
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.page-about .partner-num {
  font-family: var(--font-en);
  font-weight: 800;
  font-size: 34px;
  line-height: 1;
  letter-spacing: -.02em;
  color: var(--ochre);
}

.page-about .partner-label {
  font-size: 13.5px;
  color: var(--ink-70);
}

/* 时间线 */
.page-about .about-timeline-banner {
  margin: 0 0 30px;
}

.page-about .about-timeline-banner .media {
  border-radius: var(--radius);
  overflow: hidden;
}

.page-about .about-timeline {
  list-style: none;
  margin: 0;
  padding: 0 0 0 24px;
  border-left: 1px solid var(--line-strong);
}

.page-about .about-timeline li {
  position: relative;
  padding-bottom: 26px;
}

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

.page-about .about-timeline li::before {
  content: "";
  position: absolute;
  left: -29px;
  top: 5px;
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--gold);
  box-shadow: 0 0 0 4px var(--paper);
}

.page-about .tl-year {
  display: block;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .12em;
  color: var(--ochre);
}

.page-about .tl-body h3 {
  margin: 6px 0 0;
  font-size: 17px;
  font-weight: 600;
  line-height: 1.45;
  color: var(--ink);
}

.page-about .tl-body p {
  margin: 6px 0 0;
  font-size: 15px;
  line-height: 1.72;
  color: var(--ink-70);
}

/* 更正 */
.page-about .about-fix {
  margin-top: 4px;
  padding: 26px 24px;
  background: var(--paper);
  border: 1px solid var(--line-strong);
  border-top: 3px solid var(--ochre);
  border-radius: var(--radius);
}

.page-about .about-fix-steps {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 14px;
}

.page-about .about-fix-steps li {
  display: grid;
  grid-template-columns: 26px minmax(0, 1fr);
  gap: 12px;
  font-size: 15.5px;
  line-height: 1.7;
  color: var(--ink-80);
}

.page-about .fix-num {
  width: 24px;
  height: 24px;
  border-radius: 50%;
  background: var(--ocean);
  color: var(--paper);
  font-family: var(--font-mono);
  font-size: 12px;
  line-height: 24px;
  text-align: center;
}

.page-about .about-fix-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 24px;
  padding-top: 22px;
  border-top: 1px solid var(--line);
}

/* ---------- 右侧数字栏 ---------- */
.page-about .about-rail {
  min-width: 0;
}

@media (max-width: 1119px) {
  .page-about .about-rail {
    margin-top: 8px;
    padding-top: 28px;
    border-top: 2px solid var(--ink);
  }
}

@media (min-width: 1120px) {
  .page-about .about-rail-inner {
    position: sticky;
    top: 84px;
  }
}

.page-about .about-rail-title {
  margin: 0 0 12px;
  padding-bottom: 10px;
  border-bottom: 2px solid var(--ink);
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: .16em;
  color: var(--ink-55);
  text-transform: uppercase;
}

.page-about .about-stats {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 0;
}

@media (min-width: 560px) and (max-width: 1119px) {
  .page-about .about-stats {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 0 28px;
  }
}

.page-about .about-stat {
  padding: 14px 0;
  border-bottom: 1px solid var(--line);
}

.page-about .stat-num {
  display: block;
  font-family: var(--font-en);
  font-weight: 800;
  font-size: 38px;
  line-height: 1;
  letter-spacing: -.03em;
  color: var(--ocean);
  font-variant-numeric: tabular-nums;
}

.page-about .stat-num em {
  font-style: normal;
  font-size: .54em;
  font-weight: 600;
  margin-left: 3px;
  color: var(--ochre);
}

.page-about .stat-label {
  display: block;
  margin-top: 6px;
  font-size: 13.5px;
  color: var(--ink-70);
}

.page-about .stat-hint {
  display: block;
  max-height: 0;
  overflow: hidden;
  opacity: 0;
  font-size: 12.5px;
  line-height: 1.6;
  color: var(--ink-55);
  transition: max-height .26s ease-out, opacity .26s ease-out, margin-top .26s ease-out;
}

.page-about .about-stat:hover .stat-hint,
.page-about .about-stat:focus-within .stat-hint {
  max-height: 80px;
  opacity: 1;
  margin-top: 8px;
}

@media (max-width: 1119px) {
  .page-about .stat-hint {
    max-height: none;
    opacity: 1;
    margin-top: 8px;
  }
}

@media (hover: none) {
  .page-about .stat-hint {
    max-height: none;
    opacity: 1;
    margin-top: 8px;
  }
}

/* ---------- 响应式收束 ---------- */
@media (max-width: 719px) {
  .page-about .about-hero {
    padding-bottom: 44px;
  }
  .page-about .about-hero-figure::before {
    top: 12px;
    right: -10px;
    bottom: -12px;
    left: 10px;
  }
  .page-about .about-chapter {
    padding: 34px 0;
  }
  .page-about .about-quote {
    padding-left: 16px;
  }
  .page-about .about-map-wrap {
    padding: 22px 18px;
  }
  .page-about .about-fix {
    padding: 22px 18px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .stat-hint,
  .page-about .about-index-list a::before {
    transition: none;
  }
  .page-about .about-stat:hover .stat-hint,
  .page-about .about-stat:focus-within .stat-hint {
    max-height: none;
    opacity: 1;
    margin-top: 8px;
  }
}