.page-about {
  --about-rail-w: 208px;
  --about-text: #D9E3F2;
  --about-dim: #9EB0CC;
  position: relative;
  color: var(--cloud);
  background-color: var(--ink);
  background-image:
    radial-gradient(1000px 560px at 10% -6%, rgba(30, 123, 255, 0.26), transparent 62%),
    radial-gradient(880px 500px at 98% 2%, rgba(255, 138, 61, 0.14), transparent 60%);
  background-repeat: no-repeat;
  padding-bottom: 64px;
}

.page-about .about-wrap {
  width: 100%;
  max-width: var(--wrap);
  margin-inline: auto;
  padding-inline: 20px;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  border-bottom: 1px solid var(--line-strong);
}

.page-about .about-hero__bg {
  position: absolute;
  inset: 0;
  pointer-events: none;
  background-image:
    linear-gradient(to right, rgba(127, 212, 255, 0.09) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(127, 212, 255, 0.09) 1px, transparent 1px);
  background-size: 64px 64px;
  -webkit-mask-image: linear-gradient(to bottom, #000 0%, rgba(0, 0, 0, 0.15) 78%, transparent 100%);
  mask-image: linear-gradient(to bottom, #000 0%, rgba(0, 0, 0, 0.15) 78%, transparent 100%);
  opacity: 0.72;
}

.page-about .breadcrumb__list {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  list-style: none;
  margin: 0;
  padding: 20px 0 0;
  font-size: 13px;
}

.page-about .breadcrumb__link {
  color: var(--sky-soft);
  text-decoration: none;
}

.page-about .breadcrumb__link:hover {
  color: var(--lime);
}

.page-about .breadcrumb__sep {
  color: var(--mist);
  margin-left: 8px;
}

.page-about .breadcrumb__current {
  color: var(--mist);
}

.page-about .about-hero__grid {
  position: relative;
  display: grid;
  gap: 32px;
  padding: 24px 0 44px;
}

.page-about .about-hero__lead {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
}

.page-about .about-hero__title {
  margin: 14px 0 18px;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(34px, 7.6vw, 78px);
  line-height: 1.03;
  letter-spacing: -0.02em;
  color: var(--cloud);
}

.page-about .lede {
  margin: 0 0 24px;
  max-width: 34em;
  font-size: 16px;
  line-height: 1.8;
  color: var(--about-text);
}

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

.page-about .about-stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line-strong);
}

.page-about .about-stat {
  display: flex;
  flex-direction: column;
  gap: 8px;
  padding: 16px 14px 18px;
  background: rgba(18, 39, 77, 0.78);
}

.page-about .about-stat .stat__value {
  font-family: var(--font-mono);
  font-size: clamp(26px, 5vw, 34px);
  font-weight: 700;
  line-height: 1;
  color: var(--lime);
  font-variant-numeric: tabular-nums;
}

.page-about .about-stat .stat__label {
  font-size: 12.5px;
  line-height: 1.5;
  color: var(--mist);
}

/* ---------- 主体两栏 ---------- */
.page-about .about-body {
  display: grid;
  gap: 0;
}

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

/* ---------- 侧栏刻度 ---------- */
.page-about .about-rail {
  padding: 18px 0 22px;
  border-bottom: 1px solid var(--line);
}

.page-about .about-rail__title {
  margin: 0 0 12px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--mist);
}

.page-about .about-rail__list {
  display: flex;
  gap: 8px;
  list-style: none;
  margin: 0;
  padding: 0 0 6px;
  overflow-x: auto;
}

.page-about .about-rail__link {
  display: inline-flex;
  align-items: baseline;
  gap: 7px;
  white-space: nowrap;
  padding: 6px 10px;
  border: 1px solid var(--line);
  color: var(--about-dim);
  font-size: 14px;
  text-decoration: none;
  transition: color var(--dur) ease, border-color var(--dur) ease, background-color var(--dur) ease;
}

.page-about .about-rail__num {
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--mist);
}

.page-about .about-rail__link:hover {
  color: var(--cloud);
  border-color: var(--line-strong);
}

.page-about .about-rail__link:focus-visible {
  outline: 2px solid var(--lime);
  outline-offset: 2px;
}

.page-about .about-rail__link[aria-current="true"] {
  color: var(--ink);
  background: var(--lime);
  border-color: var(--lime);
}

.page-about .about-rail__link[aria-current="true"] .about-rail__num {
  color: var(--ink);
}

/* ---------- 章节 ---------- */
.page-about .about-section {
  padding: 52px 0;
  border-top: 1px solid var(--line);
  scroll-margin-top: calc(var(--header-h) + 24px);
}

.page-about .about-content > .about-section:first-child {
  border-top: 0;
  padding-top: 36px;
}

.page-about .section-head__num {
  margin: 0 0 10px;
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.22em;
  color: var(--lime);
}

.page-about .section-head__title {
  margin: 0 0 12px;
  font-family: var(--font-display);
  font-weight: 600;
  font-size: clamp(25px, 4.6vw, 38px);
  line-height: 1.2;
  letter-spacing: -0.01em;
  color: var(--cloud);
}

.page-about .section-head__lead {
  margin: 0;
  max-width: 62ch;
  font-size: 16px;
  line-height: 1.78;
  color: var(--about-dim);
}

.page-about .about-prose {
  max-width: 66ch;
  color: var(--about-text);
  font-size: 17px;
  line-height: 1.8;
}

.page-about .about-prose p {
  margin: 0 0 1.05em;
}

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

.page-about .about-split {
  display: grid;
  gap: 28px;
  margin-top: 26px;
}

/* ---------- 图片 ---------- */
.page-about .about-figure {
  margin: 0;
  border: 1px solid var(--line-strong);
  background: var(--deep);
  box-shadow: var(--shadow-hard);
}

.page-about .media-frame__img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
  filter: saturate(0.92) contrast(1.04);
}

.page-about .media-frame__caption {
  padding: 10px 14px;
  border-top: 1px solid var(--line);
  font-size: 12.5px;
  line-height: 1.6;
  color: var(--mist);
}

/* ---------- 流程步骤 ---------- */
.page-about .about-steps {
  list-style: none;
  margin: 30px 0 0;
  padding: 0;
  counter-reset: none;
}

.page-about .about-steps__item {
  display: grid;
  grid-template-columns: 42px minmax(0, 1fr);
  gap: 16px;
  padding: 20px 0;
  border-top: 1px solid var(--line);
}

.page-about .about-steps__num {
  font-family: var(--font-mono);
  font-size: 14px;
  font-weight: 700;
  letter-spacing: 0.06em;
  color: var(--orange);
  padding-top: 2px;
}

.page-about .about-steps__title {
  margin: 0 0 7px;
  font-family: var(--font-sans);
  font-weight: 700;
  font-size: 17px;
  letter-spacing: 0.02em;
  color: var(--cloud);
}

.page-about .about-steps__text {
  margin: 0;
  max-width: 60ch;
  font-size: 15.5px;
  line-height: 1.75;
  color: var(--about-dim);
}

/* ---------- 团队四列 ---------- */
.page-about .about-teams {
  display: grid;
  gap: 0 28px;
  margin-top: 30px;
}

.page-about .about-team {
  padding: 16px 0 24px;
  border-top: 3px solid var(--sky);
  outline: 2px solid transparent;
  outline-offset: 4px;
  transition: outline-color var(--dur) ease, border-color var(--dur) ease;
}

.page-about .about-team:hover {
  border-top-color: var(--lime);
  outline-color: rgba(198, 242, 78, 0.45);
}

.page-about .about-team__meta {
  margin: 0 0 10px;
  font-family: var(--font-mono);
  font-size: 12.5px;
  letter-spacing: 0.04em;
  color: var(--lime);
}

.page-about .about-team__name {
  margin: 0 0 10px;
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 21px;
  line-height: 1.3;
  color: var(--cloud);
}

.page-about .about-team__text {
  margin: 0;
  font-size: 15px;
  line-height: 1.78;
  color: var(--about-dim);
}

/* ---------- 时间轴 ---------- */
.page-about .about-ruler {
  display: block;
  width: 100%;
  height: 30px;
  margin: 28px 0 8px;
}

.page-about .about-ruler__base {
  stroke: rgba(127, 212, 255, 0.42);
  stroke-width: 1;
}

.page-about .about-ruler__tick {
  stroke: rgba(127, 212, 255, 0.28);
  stroke-width: 1;
}

.page-about .about-ruler__node {
  fill: var(--lime);
}

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

.page-about .about-timeline__item {
  position: relative;
  padding: 22px 0 26px 30px;
  border-left: 1px solid var(--line-strong);
}

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

.page-about .about-timeline__item::before {
  content: "";
  position: absolute;
  left: -5px;
  top: 26px;
  width: 9px;
  height: 9px;
  background: var(--lime);
}

.page-about .about-timeline__year {
  margin: 0 0 8px;
  font-family: var(--font-mono);
  font-size: 18px;
  font-weight: 700;
  letter-spacing: 0.06em;
  color: var(--orange);
  font-variant-numeric: tabular-nums;
}

.page-about .about-timeline__title {
  margin: 0 0 8px;
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 22px;
  line-height: 1.3;
  color: var(--cloud);
}

.page-about .about-timeline__text {
  margin: 0;
  max-width: 62ch;
  font-size: 15.5px;
  line-height: 1.8;
  color: var(--about-dim);
}

/* ---------- 数据表 ---------- */
.page-about .table-scroll {
  margin-top: 28px;
  overflow-x: auto;
  border: 1px solid var(--line-strong);
}

.page-about .data-table {
  width: 100%;
  min-width: 520px;
  border-collapse: collapse;
  font-size: 15px;
}

.page-about .data-table caption {
  padding: 12px 14px;
  border-bottom: 1px solid var(--line);
  text-align: left;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.16em;
  color: var(--mist);
}

.page-about .data-table th,
.page-about .data-table td {
  padding: 12px 14px;
  text-align: left;
  border-bottom: 1px solid var(--line);
}

.page-about .data-table thead th {
  background: var(--deep);
  color: var(--sky-soft);
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.06em;
}

.page-about .data-table tbody tr:nth-child(odd) {
  background: rgba(12, 58, 52, 0.42);
}

.page-about .data-table tbody tr:nth-child(even) {
  background: rgba(18, 39, 77, 0.52);
}

.page-about .data-table .num {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
}

.page-about .about-note {
  margin: 20px 0 0;
  font-size: 15px;
  line-height: 1.8;
  color: var(--about-dim);
}

.page-about .about-note__link {
  color: var(--lime);
  text-decoration: none;
  border-bottom: 1px solid rgba(198, 242, 78, 0.5);
  margin-left: 4px;
}

.page-about .about-note__link:hover {
  color: var(--cloud);
  border-bottom-color: var(--cloud);
}

/* ---------- 结尾入口 ---------- */
.page-about .about-cta {
  margin-top: 44px;
  padding: 32px 22px 30px;
  border: 2px solid var(--line-strong);
  background: linear-gradient(140deg, rgba(30, 123, 255, 0.22), rgba(10, 23, 48, 0.92) 62%);
  box-shadow: var(--shadow-hard);
}

.page-about .about-cta__title {
  margin: 0 0 22px;
  font-family: var(--font-display);
  font-weight: 600;
  font-size: clamp(23px, 4vw, 32px);
  line-height: 1.25;
  color: var(--cloud);
}

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

.page-about .about-cta__item {
  border-top: 1px solid var(--line);
}

.page-about .about-cta__link {
  display: block;
  padding: 16px 0;
  text-decoration: none;
  transition: padding-left var(--dur) ease, color var(--dur) ease;
}

.page-about .about-cta__link:hover {
  padding-left: 10px;
}

.page-about .about-cta__link:focus-visible {
  outline: 2px solid var(--lime);
  outline-offset: 3px;
}

.page-about .about-cta__label {
  display: block;
  font-family: var(--font-sans);
  font-weight: 700;
  font-size: 17px;
  letter-spacing: 0.04em;
  color: var(--lime);
}

.page-about .about-cta__link:hover .about-cta__label {
  color: var(--orange);
}

.page-about .about-cta__desc {
  display: block;
  margin-top: 6px;
  font-size: 14px;
  line-height: 1.65;
  color: var(--about-dim);
}

/* ---------- 响应式 ---------- */
@media (min-width: 700px) {
  .page-about .about-wrap {
    padding-inline: 32px;
  }

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

  .page-about .about-cta {
    padding: 40px 36px 34px;
  }

  .page-about .about-cta__list {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 0 28px;
  }

  .page-about .about-cta__item {
    border-top: 2px solid var(--sky);
  }

  .page-about .about-cta__link {
    padding: 18px 0 4px;
  }
}

@media (min-width: 1000px) {
  .page-about {
    padding-bottom: 96px;
  }

  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 1.35fr) minmax(0, 0.65fr);
    gap: 56px;
    padding: 36px 0 64px;
  }

  .page-about .about-body {
    grid-template-columns: var(--about-rail-w) minmax(0, 1fr);
    gap: 64px;
    align-items: start;
  }

  .page-about .about-rail {
    position: sticky;
    top: calc(var(--header-h) + 84px);
    padding: 36px 0 0 18px;
    border-bottom: 0;
    border-left: 1px solid var(--line-strong);
  }

  .page-about .about-rail__list {
    flex-direction: column;
    gap: 4px;
    overflow: visible;
    padding: 0;
  }

  .page-about .about-rail__link {
    padding: 7px 0;
    border: 0;
  }

  .page-about .about-rail__link[aria-current="true"] {
    color: var(--lime);
    background: transparent;
  }

  .page-about .about-rail__link[aria-current="true"] .about-rail__num {
    color: var(--lime);
  }

  .page-about .about-content > .about-section:first-child {
    padding-top: 36px;
  }

  .page-about .about-section {
    padding: 72px 0;
  }

  .page-about .about-split {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1.05fr);
    gap: 44px;
    align-items: start;
  }

  .page-about .about-split--reverse {
    grid-template-columns: minmax(0, 0.9fr) minmax(0, 1.1fr);
  }

  .page-about .about-split--reverse > .about-figure {
    order: 1;
  }

  .page-about .about-split--reverse > .about-prose {
    order: 2;
  }

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

@media (prefers-reduced-motion: reduce) {
  .page-about .about-rail__link,
  .page-about .about-team,
  .page-about .about-cta__link {
    transition: none;
  }
}