.page-about {
  background: var(--ink);
  color: var(--frost);
  font-family: var(--sans);
  font-size: 16px;
  line-height: 1.85;
  overflow-x: hidden;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  padding-top: 36px;
  background: linear-gradient(180deg, #0A1018 0%, var(--ink) 82%);
  border-bottom: 1px solid var(--steel);
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 2px;
  background: linear-gradient(90deg, var(--blue) 0%, var(--cyan) 46%, rgba(79, 209, 197, 0) 94%);
  opacity: .85;
}

.page-about .about-hero .crumbs {
  display: flex;
  align-items: center;
  gap: 8px;
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: .12em;
  color: var(--mist);
}

.page-about .about-hero .crumbs a {
  color: var(--mist);
  text-decoration: none;
  transition: color var(--t-fast) var(--ease);
}

.page-about .about-hero .crumbs a:hover,
.page-about .about-hero .crumbs a:focus-visible {
  color: var(--blue);
}

.page-about .about-hero__body {
  padding-top: 44px;
  padding-bottom: 56px;
}

.page-about .about-hero__eyebrow {
  margin: 0 0 18px;
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: .12em;
  text-transform: uppercase;
  color: var(--mist);
}

.page-about .about-hero__title {
  margin: 0;
  font-family: var(--sans);
  font-weight: 800;
  font-size: clamp(38px, 8.4vw, 84px);
  line-height: 1.04;
  letter-spacing: -0.012em;
  color: var(--frost);
  max-width: 12ch;
}

.page-about .about-hero__lead {
  margin: 26px 0 0;
  max-width: 60ch;
  font-size: 17px;
  line-height: 1.9;
  color: var(--mist);
}

.page-about .about-hero__stats {
  display: flex;
  flex-wrap: wrap;
  gap: 14px 34px;
  margin: 34px 0 0;
  padding: 22px 0 0;
  list-style: none;
  border-top: 1px solid var(--steel);
}

.page-about .about-hero__stat {
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.page-about .about-hero__stat .num {
  font-family: var(--mono);
  font-variant-numeric: tabular-nums;
  font-size: clamp(22px, 3vw, 28px);
  line-height: 1.15;
  letter-spacing: .04em;
  color: var(--frost);
}

.page-about .about-hero__stat-label {
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: .1em;
  color: var(--mist);
}

.page-about .about-hero__figure {
  margin: 0;
  position: relative;
  border-top: 1px solid var(--steel);
}

.page-about .about-hero__figure img {
  display: block;
  width: 100%;
  height: auto;
  max-width: 100%;
  aspect-ratio: 1600 / 600;
  object-fit: cover;
  opacity: .9;
}

/* ---------- 页面骨架 ---------- */
.page-about .about-layout {
  padding-top: 64px;
  padding-bottom: 40px;
}

.page-about .about-index {
  margin-bottom: 52px;
  padding-bottom: 26px;
  border-bottom: 1px solid var(--steel);
}

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

.page-about .about-index__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 6px 18px;
}

.page-about .about-index__list a {
  display: inline-flex;
  align-items: baseline;
  gap: 8px;
  color: var(--mist);
  text-decoration: none;
  font-size: 14px;
  line-height: 1.6;
  transition: color var(--t-fast) var(--ease);
}

.page-about .about-index__no {
  font-family: var(--mono);
  font-variant-numeric: tabular-nums;
  font-size: 11px;
  letter-spacing: .12em;
  color: var(--brushed);
}

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

.page-about .about-index__list a:hover .about-index__no,
.page-about .about-index__list a:focus-visible .about-index__no {
  color: var(--blue);
}

/* ---------- 章节通用 ---------- */
.page-about .about-sec {
  padding-bottom: 78px;
  scroll-margin-top: 92px;
}

.page-about .about-sec__head {
  margin-bottom: 26px;
}

.page-about .about-sec__rule {
  display: block;
  width: 52px;
  height: 2px;
  margin-bottom: 16px;
  background: linear-gradient(90deg, var(--blue), var(--cyan));
}

.page-about .about-sec__head .eyebrow {
  margin: 0 0 10px;
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: .12em;
  text-transform: uppercase;
  color: var(--mist);
  font-weight: 400;
}

.page-about .about-sec h2 {
  margin: 0;
  font-family: var(--sans);
  font-weight: 800;
  font-size: clamp(24px, 3.6vw, 36px);
  line-height: 1.24;
  letter-spacing: -0.008em;
  color: var(--frost);
}

.page-about .about-sec p {
  margin: 0 0 1.2em;
  max-width: 66ch;
  font-size: 16px;
  line-height: 1.88;
  color: var(--mist);
}

.page-about .about-sec p strong {
  color: var(--frost);
  font-weight: 700;
}

.page-about .about-sec a {
  color: var(--blue);
  text-decoration: none;
  border-bottom: 1px solid rgba(127, 182, 217, .35);
  transition: color var(--t-fast) var(--ease), border-color var(--t-fast) var(--ease);
}

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

/* ---------- 时间线 ---------- */
.page-about .tl {
  list-style: none;
  margin: 30px 0 0;
  padding: 0;
  position: relative;
}

.page-about .tl::before {
  content: "";
  position: absolute;
  left: 5px;
  top: 12px;
  bottom: 14px;
  width: 1px;
  background: linear-gradient(180deg, var(--blue) 0%, var(--cyan) 40%, rgba(27, 33, 41, 0) 100%);
  opacity: .55;
}

.page-about .tl__item {
  position: relative;
  padding: 0 0 32px 34px;
}

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

.page-about .tl__dot {
  position: absolute;
  left: 0;
  top: 8px;
  width: 11px;
  height: 11px;
  border-radius: 50%;
  background: var(--ink);
  border: 2px solid var(--amber);
  box-shadow: 0 0 0 4px rgba(255, 194, 75, .1);
}

.page-about .tl__year {
  display: block;
  margin-bottom: 4px;
  font-family: var(--mono);
  font-variant-numeric: tabular-nums;
  font-size: 12.5px;
  letter-spacing: .14em;
  color: var(--amber);
}

.page-about .tl__title {
  margin: 0 0 6px;
  font-size: 17px;
  font-weight: 700;
  line-height: 1.5;
  color: var(--frost);
}

.page-about .tl__text {
  margin: 0;
  max-width: 62ch;
  font-size: 15.5px;
  line-height: 1.85;
  color: var(--mist);
}

/* ---------- 分类九宫格 ---------- */
.page-about .cat-grid {
  list-style: none;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin: 28px 0;
  padding: 0;
  background: var(--steel);
  border: 1px solid var(--steel);
}

.page-about .cat-grid__item {
  display: flex;
  flex-direction: column;
  gap: 4px;
  padding: 16px 16px 18px;
  background: var(--carbon);
  transition: background var(--t-fast) var(--ease);
}

.page-about .cat-grid__item:hover {
  background: var(--steel);
}

.page-about .cat-grid__no {
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: .14em;
  color: var(--brushed);
}

.page-about .cat-grid__name {
  font-size: 16px;
  font-weight: 700;
  color: var(--frost);
  line-height: 1.45;
}

.page-about .cat-grid__meta {
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: .04em;
  color: var(--blue);
}

/* ---------- 对照表 ---------- */
.page-about .matrix-wrap {
  margin: 26px 0 0;
  overflow-x: auto;
  overscroll-behavior-x: contain;
  -webkit-overflow-scrolling: touch;
  border: 1px solid var(--steel);
  background: var(--carbon);
}

.page-about .matrix-wrap:focus-visible {
  outline: 1px solid var(--blue);
  outline-offset: 2px;
}

.page-about .matrix {
  width: 100%;
  min-width: 640px;
  border-collapse: collapse;
  font-size: 14.5px;
  line-height: 1.6;
}

.page-about .matrix th,
.page-about .matrix td {
  padding: 12px 16px;
  text-align: left;
  border-bottom: 1px solid var(--steel);
  white-space: nowrap;
}

.page-about .matrix thead th {
  font-family: var(--mono);
  font-size: 11.5px;
  font-weight: 500;
  letter-spacing: .14em;
  text-transform: uppercase;
  color: var(--mist);
  background: var(--steel);
}

.page-about .matrix tbody td {
  color: var(--mist);
}

.page-about .matrix tbody td:first-child {
  color: var(--frost);
  font-weight: 700;
}

.page-about .matrix tbody td:last-child {
  color: var(--cyan);
}

.page-about .matrix tbody tr:hover td {
  background: rgba(127, 182, 217, .06);
}

.page-about .matrix tbody tr:last-child td {
  border-bottom: 0;
}

.page-about .matrix-note {
  margin-top: 16px;
  font-family: var(--mono);
  font-size: 13px;
  letter-spacing: .02em;
  color: var(--mist);
}

/* ---------- 团队 ---------- */
.page-about .team-grid {
  display: grid;
  gap: 34px;
  margin-top: 10px;
}

.page-about .team-list {
  list-style: none;
  margin: 22px 0 0;
  padding: 0;
  border-top: 1px solid var(--steel);
}

.page-about .team-list__item {
  display: flex;
  gap: 16px;
  padding: 16px 0;
  border-bottom: 1px solid var(--steel);
}

.page-about .team-list__no {
  flex: 0 0 auto;
  padding-top: 3px;
  font-family: var(--mono);
  font-size: 11.5px;
  letter-spacing: .14em;
  color: var(--blue);
}

.page-about .team-list__name {
  margin: 0 0 4px;
  font-size: 16px;
  font-weight: 700;
  line-height: 1.5;
  color: var(--frost);
}

.page-about .team-list__desc {
  margin: 0;
  font-size: 15px;
  line-height: 1.8;
  color: var(--mist);
}

/* ---------- 图 ---------- */
.page-about .about-figure {
  margin: 0;
  border: 1px solid var(--steel);
  background: var(--carbon);
}

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

.page-about .about-figure figcaption {
  padding: 12px 16px;
  border-top: 1px solid var(--steel);
  font-family: var(--mono);
  font-size: 12px;
  line-height: 1.7;
  letter-spacing: .02em;
  color: var(--mist);
}

/* ---------- 复核节奏 ---------- */
.page-about .review-grid {
  display: grid;
  gap: 1px;
  margin-top: 26px;
  background: var(--steel);
  border: 1px solid var(--steel);
}

.page-about .review-item {
  padding: 22px 20px 24px;
  background: var(--carbon);
}

.page-about .review-item__num {
  display: inline-block;
  font-family: var(--mono);
  font-variant-numeric: tabular-nums;
  font-size: 32px;
  line-height: 1.1;
  letter-spacing: .04em;
  color: var(--frost);
}

.page-about .review-item__unit {
  display: block;
  margin: 4px 0 14px;
  font-family: var(--mono);
  font-size: 11.5px;
  letter-spacing: .12em;
  color: var(--amber);
}

.page-about .review-item__title {
  margin: 0 0 6px;
  font-size: 16px;
  font-weight: 700;
  color: var(--frost);
}

.page-about .review-item__desc {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.8;
  color: var(--mist);
}

/* ---------- 海外适配 ---------- */
.page-about .overseas-grid {
  display: grid;
  gap: 32px;
  margin-top: 8px;
}

.page-about .about-cta {
  margin-top: 42px;
  padding: 26px 24px;
  border: 1px solid var(--steel);
  border-left: 2px solid var(--neon);
  background: linear-gradient(90deg, rgba(194, 31, 90, .08) 0%, rgba(16, 20, 27, 0) 62%);
}

.page-about .about-cta__text {
  margin: 0 0 18px;
  max-width: 52ch;
  font-size: 16px;
  line-height: 1.85;
  color: var(--frost);
}

.page-about .about-cta__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px 12px;
}

/* ---------- 响应式 ---------- */
@media (min-width: 620px) {
  .page-about .cat-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

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

@media (min-width: 900px) {
  .page-about .team-grid {
    grid-template-columns: minmax(0, 1fr) 300px;
    gap: 48px;
    align-items: start;
  }

  .page-about .overseas-grid {
    grid-template-columns: minmax(0, 1fr) 340px;
    gap: 48px;
    align-items: start;
  }

  .page-about .about-cta {
    padding: 30px 32px;
  }
}

@media (min-width: 1024px) {
  .page-about .about-layout {
    display: grid;
    grid-template-columns: 188px minmax(0, 1fr);
    gap: 60px;
    align-items: start;
    padding-top: 76px;
  }

  .page-about .about-index {
    position: sticky;
    top: 96px;
    margin-bottom: 0;
    padding-bottom: 0;
    border-bottom: 0;
  }

  .page-about .about-index__list {
    flex-direction: column;
    flex-wrap: nowrap;
    gap: 0;
  }

  .page-about .about-index__list a {
    display: flex;
    width: 100%;
    padding: 8px 0 8px 14px;
    border-left: 2px solid var(--steel);
  }

  .page-about .about-index__list a:hover,
  .page-about .about-index__list a:focus-visible {
    border-left-color: var(--blue);
  }
}

@media (min-width: 1200px) {
  .page-about .cat-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .page-about .about-hero__body {
    padding-top: 56px;
    padding-bottom: 68px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-index__list a,
  .page-about .cat-grid__item,
  .page-about .about-sec a {
    transition: none;
  }
}