.page-about {
  --about-toc-w: 172px;
  --about-line: rgba(246, 241, 231, 0.14);
  --about-soft: rgba(246, 241, 231, 0.78);
  display: block;
  background: var(--night);
  color: var(--chalk);
  overflow-x: clip;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  overflow: hidden;
  padding: clamp(20px, 5vw, 44px) 0 clamp(36px, 7vw, 80px);
  border-bottom: var(--frame) solid var(--ink);
  background:
    radial-gradient(120% 92% at 84% 4%, rgba(255, 77, 46, 0.32), transparent 58%),
    radial-gradient(90% 74% at 4% 100%, rgba(46, 196, 182, 0.18), transparent 62%),
    var(--night);
}

.page-about .about-hero__inner {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(26px, 4.5vw, 48px);
  align-items: end;
}

.page-about .breadcrumbs {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--about-soft);
  margin-bottom: 18px;
}

.page-about .breadcrumbs a {
  color: var(--lake);
  text-decoration: none;
}

.page-about .breadcrumbs a:hover,
.page-about .breadcrumbs a:focus-visible {
  text-decoration: underline;
}

.page-about .about-hero__title {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(40px, 9.4vw, 86px);
  line-height: 0.96;
  letter-spacing: -0.02em;
  margin: 10px 0 0;
  color: var(--chalk);
}

.page-about .about-hero__title em {
  display: block;
  font-style: normal;
  font-size: 0.58em;
  line-height: 1.1;
  letter-spacing: 0.01em;
  color: var(--signal);
  margin-top: 10px;
}

.page-about .about-hero__lede {
  max-width: 52ch;
  margin: 18px 0 0;
  font-size: clamp(15px, 1.6vw, 17.5px);
  line-height: 1.8;
  color: var(--about-soft);
}

.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 24px;
}

.page-about .about-hero__plate {
  border: var(--frame) solid var(--ink);
  background: var(--cream);
  color: var(--ink);
  box-shadow: var(--hard);
  padding: 16px 16px 10px;
  transform: rotate(-1.2deg);
}

.page-about .about-hero__plate-title {
  margin: 0 0 10px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: rgba(26, 18, 14, 0.62);
}

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

.page-about .about-fact {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 12px;
  padding: 9px 0;
  border-top: 1px solid rgba(26, 18, 14, 0.18);
}

.page-about .about-fact__key {
  font-size: 13px;
  color: rgba(26, 18, 14, 0.68);
}

.page-about .about-fact__val {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 22px;
  letter-spacing: -0.01em;
  color: var(--ink);
  font-variant-numeric: tabular-nums;
}

/* ---------- 外壳与章节导航 ---------- */
.page-about .about-shell {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  padding-top: clamp(18px, 3vw, 34px);
  padding-bottom: clamp(44px, 7vw, 88px);
}

.page-about .about-toc {
  margin-bottom: 10px;
  min-width: 0;
}

.page-about .about-toc__title {
  margin: 0 0 10px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--lake);
}

.page-about .about-toc__list {
  list-style: none;
  margin: 0;
  padding: 0 0 8px;
  display: flex;
  gap: 8px;
  overflow-x: auto;
}

.page-about .about-toc__link {
  display: flex;
  align-items: baseline;
  gap: 8px;
  white-space: nowrap;
  padding: 7px 11px;
  border: 2px solid rgba(246, 241, 231, 0.18);
  color: var(--chalk);
  text-decoration: none;
  font-size: 13px;
  transition: color var(--dur) var(--ease), border-color var(--dur) var(--ease);
}

.page-about .about-toc__link:hover,
.page-about .about-toc__link:focus-visible {
  color: var(--signal);
  border-color: var(--signal);
}

.page-about .about-toc__idx {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--ember);
}

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

/* ---------- 章节 ---------- */
.page-about .about-sec {
  position: relative;
  padding: clamp(30px, 5vw, 58px) 0;
  border-top: 3px solid var(--plateau);
}

.page-about .about-sec::before {
  content: "";
  position: absolute;
  top: -3px;
  left: 0;
  width: 54px;
  height: 3px;
  background: var(--signal);
}

.page-about .about-sec--tint {
  background: linear-gradient(180deg, rgba(14, 42, 71, 0.72), rgba(7, 20, 38, 0));
  padding-left: clamp(0px, 2vw, 20px);
  padding-right: clamp(0px, 2vw, 20px);
}

.page-about .about-sec__head {
  margin-bottom: clamp(18px, 3vw, 30px);
  max-width: 64ch;
}

.page-about .about-sec__num {
  display: block;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(46px, 9vw, 92px);
  line-height: 0.8;
  letter-spacing: -0.04em;
  color: transparent;
  -webkit-text-stroke: 1.5px rgba(246, 241, 231, 0.34);
  margin-bottom: 12px;
}

.page-about .about-sec__title {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(24px, 3.4vw, 40px);
  line-height: 1.16;
  letter-spacing: -0.01em;
  margin: 6px 0 0;
  color: var(--chalk);
}

.page-about .about-split {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(18px, 3vw, 32px);
  align-items: start;
}

.page-about .about-lead {
  margin: 0 0 14px;
  font-size: clamp(15px, 1.5vw, 17px);
  line-height: 1.8;
  color: var(--chalk);
}

.page-about .prose p {
  max-width: 66ch;
  margin: 0 0 14px;
  font-size: clamp(15px, 1.5vw, 17px);
  line-height: 1.82;
  color: var(--about-soft);
}

.page-about .about-inline-link {
  margin: 16px 0 0;
  font-size: 14px;
  color: var(--about-soft);
}

.page-about .about-inline-link a {
  color: var(--lake);
  text-decoration: underline;
  text-underline-offset: 3px;
}

.page-about .about-inline-link a:hover,
.page-about .about-inline-link a:focus-visible {
  color: var(--signal);
}

/* ---------- 图片 ---------- */
.page-about .media {
  margin: 0;
  min-width: 0;
}

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

/* ---------- 场景说明 ---------- */
.page-about .about-scene {
  list-style: none;
  margin: 20px 0 0;
  padding: 0;
  display: grid;
  gap: 10px;
}

.page-about .about-scene li {
  border-left: 3px solid var(--lake);
  background: rgba(14, 42, 71, 0.66);
  padding: 12px 14px;
}

.page-about .about-scene strong {
  display: block;
  font-family: var(--font-display);
  font-size: 15px;
  letter-spacing: 0.02em;
  color: var(--chalk);
  margin-bottom: 4px;
}

.page-about .about-scene span {
  font-size: 14px;
  line-height: 1.72;
  color: var(--about-soft);
}

/* ---------- 分工卡片 ---------- */
.page-about .about-roles {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 14px;
}

.page-about .about-role {
  border: var(--frame) solid var(--ink);
  background: var(--plateau);
  padding: 16px;
  transition:
    border-color var(--dur) var(--ease),
    transform var(--dur) var(--ease),
    box-shadow var(--dur) var(--ease);
}

.page-about .about-role:hover,
.page-about .about-role:focus-within {
  border-color: var(--signal);
  transform: translateY(-3px);
  box-shadow: var(--hard);
}

.page-about .about-role__kicker {
  margin: 0 0 6px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--ember);
}

.page-about .about-role__title {
  margin: 0 0 8px;
  font-family: var(--font-display);
  font-size: clamp(18px, 2vw, 22px);
  line-height: 1.25;
  color: var(--chalk);
}

.page-about .about-role__body {
  margin: 0;
  font-size: 14px;
  line-height: 1.72;
  color: var(--about-soft);
}

.page-about .about-role__more {
  overflow: hidden;
  max-height: 0;
  opacity: 0;
  margin-top: 0;
  font-size: 13.5px;
  line-height: 1.7;
  color: rgba(246, 241, 231, 0.68);
  transition: max-height var(--dur) var(--ease), opacity var(--dur) var(--ease), margin-top var(--dur) var(--ease);
}

.page-about .about-role:hover .about-role__more,
.page-about .about-role:focus-within .about-role__more {
  max-height: 240px;
  opacity: 1;
  margin-top: 10px;
}

/* ---------- 复核流程 ---------- */
.page-about .about-steps {
  list-style: none;
  margin: 18px 0 0;
  padding: 0;
}

.page-about .about-steps li {
  display: grid;
  grid-template-columns: 38px minmax(0, 1fr);
  gap: 12px;
  padding: 13px 0;
  border-bottom: 1px dashed var(--about-line);
  font-size: 14.5px;
  line-height: 1.75;
  color: var(--about-soft);
}

.page-about .about-steps li:first-child {
  border-top: 1px dashed var(--about-line);
}

.page-about .about-steps b {
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--grass);
  letter-spacing: 0.06em;
}

.page-about .about-steps strong {
  color: var(--chalk);
}

.page-about .about-notes {
  display: grid;
  gap: 12px;
}

.page-about .about-note {
  border: var(--frame) solid var(--ink);
  background: var(--cream);
  color: var(--ink);
  box-shadow: var(--hard);
  padding: 14px 16px;
}

.page-about .about-note--alt {
  background: var(--plateau);
  color: var(--chalk);
  border-color: var(--signal);
  box-shadow: none;
}

.page-about .about-note__kicker {
  margin: 0 0 6px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: rgba(26, 18, 14, 0.62);
}

.page-about .about-note--alt .about-note__kicker {
  color: var(--ember);
}

.page-about .about-note__text {
  margin: 0;
  font-size: 14px;
  line-height: 1.72;
}

.page-about .about-note--alt .about-note__text {
  color: var(--about-soft);
}

.page-about .about-note__sample {
  margin: 10px 0 0;
}

/* ---------- 时间轴 ---------- */
.page-about .about-timeline {
  list-style: none;
  margin: 20px 0 0;
  padding: 4px 2px 16px;
  display: flex;
  gap: 14px;
  overflow-x: auto;
  scroll-snap-type: x proximity;
  -webkit-overflow-scrolling: touch;
}

.page-about .about-timeline li {
  flex: 0 0 min(76vw, 296px);
  scroll-snap-align: start;
  border: var(--frame) solid var(--ink);
  background: linear-gradient(180deg, var(--plateau), var(--night));
  padding: 16px 16px 18px;
  box-shadow: var(--hard);
}

.page-about .about-timeline__year {
  display: block;
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: 30px;
  line-height: 1;
  letter-spacing: 0.02em;
  color: var(--signal);
  font-variant-numeric: tabular-nums;
  margin-bottom: 10px;
}

.page-about .about-timeline__title {
  margin: 0 0 8px;
  font-family: var(--font-display);
  font-size: 18px;
  line-height: 1.3;
  color: var(--chalk);
}

.page-about .about-timeline li p {
  margin: 0;
  font-size: 13.5px;
  line-height: 1.72;
  color: var(--about-soft);
}

/* ---------- 合作 ---------- */
.page-about .about-partner-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 10px;
  margin-top: 6px;
}

.page-about .about-partner {
  border-left: 3px solid var(--ember);
  background: rgba(7, 20, 38, 0.6);
  padding: 12px 14px;
}

.page-about .about-partner__title {
  margin: 0 0 6px;
  font-family: var(--font-display);
  font-size: 16.5px;
  letter-spacing: 0.01em;
  color: var(--chalk);
}

.page-about .about-partner p {
  margin: 0;
  font-size: 13.5px;
  line-height: 1.72;
  color: var(--about-soft);
}

/* ---------- 团队 ---------- */
.page-about .about-team {
  list-style: none;
  margin: 0 0 22px;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 10px;
}

.page-about .about-team__item {
  border: 2px solid rgba(246, 241, 231, 0.16);
  border-top: 3px solid var(--ember);
  padding: 12px 12px 10px;
  background: rgba(14, 42, 71, 0.5);
}

.page-about .about-team__num {
  display: block;
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: 26px;
  line-height: 1.1;
  color: var(--chalk);
  font-variant-numeric: tabular-nums;
}

.page-about .about-team__label {
  display: block;
  margin-top: 4px;
  font-size: 12.5px;
  letter-spacing: 0.08em;
  color: rgba(246, 241, 231, 0.66);
}

.page-about .about-promise {
  list-style: none;
  margin: 0;
  padding: 0;
  border-top: 3px solid var(--lake);
}

.page-about .about-promise li {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  justify-content: space-between;
  gap: 6px 14px;
  padding: 11px 0;
  border-bottom: 1px dashed var(--about-line);
}

.page-about .about-promise__key {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--lake);
}

.page-about .about-promise__val {
  font-size: 14px;
  line-height: 1.7;
  color: var(--chalk);
}

/* ---------- 结尾行动区 ---------- */
.page-about .about-cta {
  position: relative;
  overflow: hidden;
  margin-top: clamp(26px, 4vw, 48px);
  border: var(--frame) solid var(--signal);
  background:
    linear-gradient(135deg, rgba(255, 77, 46, 0.18), rgba(46, 196, 182, 0.1)),
    var(--night);
  padding: clamp(24px, 4.6vw, 48px);
  box-shadow: var(--hard);
}

.page-about .about-cta::after {
  content: "";
  position: absolute;
  right: -60px;
  bottom: -80px;
  width: 220px;
  height: 220px;
  background: rgba(255, 138, 61, 0.14);
  transform: rotate(24deg);
  pointer-events: none;
}

.page-about .about-cta__title {
  position: relative;
  margin: 6px 0 12px;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(26px, 3.6vw, 42px);
  line-height: 1.14;
  letter-spacing: -0.01em;
  color: var(--chalk);
}

.page-about .about-cta__text {
  position: relative;
  max-width: 60ch;
  margin: 0;
  font-size: clamp(14.5px, 1.5vw, 16.5px);
  line-height: 1.82;
  color: var(--about-soft);
}

.page-about .about-cta__actions {
  position: relative;
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 22px;
}

/* ---------- 响应式 ---------- */
@media (min-width: 720px) {
  .page-about .about-roles {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

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

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

@media (min-width: 900px) {
  .page-about .about-shell {
    grid-template-columns: var(--about-toc-w) minmax(0, 1fr);
    gap: clamp(22px, 3.6vw, 52px);
  }

  .page-about .about-toc {
    position: sticky;
    top: calc(var(--bar-h) + 20px);
    align-self: start;
    margin-bottom: 0;
  }

  .page-about .about-toc__list {
    flex-direction: column;
    overflow: visible;
    padding-bottom: 0;
    gap: 0;
  }

  .page-about .about-toc__link {
    border: 0;
    border-left: 3px solid var(--about-line);
    padding: 9px 10px;
    white-space: normal;
  }

  .page-about .about-toc__link:hover,
  .page-about .about-toc__link:focus-visible {
    border-left-color: var(--signal);
    background: rgba(255, 77, 46, 0.08);
  }

  .page-about .about-split {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, 0.95fr);
    gap: clamp(24px, 3.4vw, 40px);
  }

  .page-about .about-split--reverse {
    grid-template-columns: minmax(0, 0.85fr) minmax(0, 1.15fr);
  }

  .page-about .about-hero__inner {
    grid-template-columns: minmax(0, 1.32fr) minmax(250px, 0.68fr);
  }
}

@media (min-width: 1180px) {
  .page-about {
    --about-toc-w: 196px;
  }

  .page-about .about-roles {
    grid-template-columns: minmax(0, 1.15fr) minmax(0, 0.85fr);
  }

  .page-about .about-role:nth-child(3) {
    grid-column: 1;
  }

  .page-about .about-role:nth-child(4) {
    grid-column: 2;
  }
}

@media (hover: none) {
  .page-about .about-role__more {
    max-height: none;
    opacity: 1;
    margin-top: 10px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-role,
  .page-about .about-role__more,
  .page-about .about-toc__link {
    transition: none;
  }

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

  .page-about .about-hero__plate {
    transform: none;
  }
}