.page-about {
  --about-rail-line: var(--line);
  --about-soft: var(--ink-2);
  background: var(--ink);
  color: var(--paper);
  font-family: var(--font-body);
  padding-bottom: 64px;
}

.page-about a {
  color: inherit;
}

.page-about a:focus-visible,
.page-about [tabindex="0"]:focus-visible {
  outline: 2px solid var(--cyan);
  outline-offset: 3px;
}

.page-about .about-shell {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 30px;
  padding-block: 20px 32px;
}

/* ---------- 侧栏：章节索引与关键数字 ---------- */
.page-about .about-rail {
  display: grid;
  align-content: start;
  gap: 20px;
  padding-top: 16px;
  border-top: 2px solid var(--cyan);
}

.page-about .about-rail__nav {
  display: grid;
  gap: 10px;
}

.page-about .about-toc {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 2px;
}

.page-about .about-toc a {
  display: flex;
  align-items: baseline;
  gap: 10px;
  padding: 7px 0 7px 12px;
  border-left: 2px solid var(--about-rail-line);
  color: var(--muted);
  font-size: 13px;
  line-height: 1.4;
  text-decoration: none;
  transition: color 180ms var(--ease), border-color 180ms var(--ease), background 180ms var(--ease);
}

.page-about .about-toc a:hover,
.page-about .about-toc a:focus-visible,
.page-about .about-toc a.is-active,
.page-about .about-toc a[aria-current="true"] {
  color: var(--paper);
  border-left-color: var(--cyan);
  background: linear-gradient(90deg, rgba(47, 232, 184, 0.1), rgba(47, 232, 184, 0));
}

.page-about .about-toc__index {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.08em;
  color: var(--cyan-deep);
  font-variant-numeric: tabular-nums;
}

.page-about .about-toc a.is-active .about-toc__index,
.page-about .about-toc a[aria-current="true"] .about-toc__index,
.page-about .about-toc a:hover .about-toc__index {
  color: var(--cyan);
}

.page-about .rail-facts {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 14px;
  margin: 0;
  padding-top: 16px;
  border-top: 1px solid var(--line);
}

.page-about .rail-facts dt {
  font-size: 11px;
  letter-spacing: 0.14em;
  color: var(--muted);
}

.page-about .rail-facts dd {
  margin: 5px 0 0;
  font-family: var(--font-mono);
  font-size: 21px;
  line-height: 1.1;
  color: var(--cyan);
  font-variant-numeric: tabular-nums;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  display: grid;
  gap: 16px;
}

.page-about .about-hero__title {
  margin: 4px 0 0;
  font-family: var(--font-display);
  font-weight: 300;
  font-size: clamp(34px, 8.4vw, 68px);
  line-height: 1.04;
  letter-spacing: -0.02em;
}

.page-about .about-hero__title span {
  color: var(--cyan);
}

.page-about .about-hero__lead {
  margin: 0;
  max-width: 48em;
  font-size: 16px;
  line-height: 1.78;
  color: var(--paper);
}

.page-about .about-hero__meta {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 18px;
  margin: 0;
  padding: 12px 0 0;
  border-top: 1px solid var(--line);
  list-style: none;
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--muted);
}

.page-about .about-hero__meta li {
  position: relative;
  padding-left: 12px;
}

.page-about .about-hero__meta li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.55em;
  width: 4px;
  height: 4px;
  border-radius: 50%;
  background: var(--amber);
}

/* ---------- 图片容器 ---------- */
.page-about .about-figure {
  margin: 0;
}

.page-about .about-figure .media-frame {
  overflow: hidden;
}

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

.page-about .about-figure figcaption {
  margin-top: 8px;
  font-size: 13px;
  line-height: 1.6;
  color: var(--muted);
}

.page-about .about-figure--aside {
  margin-top: 22px;
}

/* ---------- 章节通用 ---------- */
.page-about .about-section {
  padding-top: 38px;
  scroll-margin-top: 84px;
}

.page-about .about-section__head {
  display: grid;
  gap: 6px;
  margin-bottom: 16px;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--line);
}

.page-about .about-section__num {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.18em;
  color: var(--cyan);
}

.page-about .about-section__title {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 600;
  font-size: clamp(23px, 5vw, 32px);
  line-height: 1.22;
  letter-spacing: -0.01em;
}

.page-about .about-section p {
  margin: 0 0 14px;
  font-size: 16px;
  line-height: 1.78;
}

.page-about .about-section__lead {
  font-size: 17px;
  color: var(--paper);
  padding-left: 14px;
  border-left: 2px solid var(--amber);
}

.page-about .about-muted {
  color: var(--muted);
  font-size: 13px;
  line-height: 1.7;
}

/* ---------- 版本时间线 ---------- */
.page-about .version-track {
  list-style: none;
  margin: 18px 0 0;
  padding: 0;
  display: grid;
  gap: 16px;
}

.page-about .version {
  position: relative;
  padding: 0 0 16px 22px;
  border-left: 1px solid var(--line-strong);
  transition: border-color 200ms var(--ease);
}

.page-about .version:hover,
.page-about .version:focus-within {
  border-left-color: var(--cyan);
}

.page-about .version__dot {
  position: absolute;
  left: -6px;
  top: 8px;
  width: 11px;
  height: 11px;
  border-radius: 50%;
  background: var(--ink);
  border: 2px solid var(--violet);
}

.page-about .version--a .version__dot {
  border-color: var(--cyan);
}

.page-about .version--b .version__dot {
  border-color: var(--amber);
}

.page-about .version__year {
  margin: 0 0 4px;
  font-family: var(--font-mono);
  font-size: 22px;
  line-height: 1;
  letter-spacing: 0.02em;
  color: var(--paper);
  font-variant-numeric: tabular-nums;
}

.page-about .version__body p {
  margin: 0 0 8px;
  font-size: 15px;
  line-height: 1.72;
}

.page-about .version__note {
  font-size: 13px;
  line-height: 1.65;
  color: var(--muted);
  padding-left: 10px;
  border-left: 1px solid var(--line-strong);
}

.page-about .version .ng-h3 {
  margin: 0 0 6px;
  font-size: 18px;
  font-weight: 600;
}

/* ---------- 团队构成 ---------- */
.page-about .team-bar {
  display: flex;
  gap: 3px;
  margin: 20px 0 18px;
  align-items: stretch;
}

.page-about .team-bar__seg {
  position: relative;
  flex: 1 1 0;
  min-height: 74px;
  padding: 10px 8px 10px;
  display: flex;
  flex-direction: column;
  justify-content: flex-end;
  gap: 3px;
  background: var(--ink-3);
  border-top: 2px solid var(--cyan-deep);
  transition: background 200ms var(--ease), transform 200ms var(--ease);
}

.page-about .team-bar__seg--a {
  flex-grow: 16;
  border-top-color: var(--cyan);
}

.page-about .team-bar__seg--b {
  flex-grow: 14;
  border-top-color: var(--amber);
}

.page-about .team-bar__seg--c {
  flex-grow: 8;
  border-top-color: var(--violet);
}

.page-about .team-bar__seg:hover,
.page-about .team-bar__seg:focus-visible {
  background: #1b5a48;
}

.page-about .team-bar__num {
  font-family: var(--font-mono);
  font-size: 22px;
  line-height: 1;
  color: var(--paper);
  font-variant-numeric: tabular-nums;
}

.page-about .team-bar__label {
  font-size: 10px;
  letter-spacing: 0.1em;
  color: var(--muted);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.page-about .team-bar__tip {
  display: none;
}

.page-about .team-legend {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 12px;
}

.page-about .team-legend__item {
  display: grid;
  grid-template-columns: 10px minmax(0, 1fr);
  gap: 4px 10px;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--line);
}

.page-about .team-legend__dot {
  width: 8px;
  height: 8px;
  margin-top: 8px;
  border-radius: 50%;
  background: var(--cyan);
}

.page-about .team-legend__dot--b {
  background: var(--amber);
}

.page-about .team-legend__dot--c {
  background: var(--violet);
}

.page-about .team-legend__name {
  font-size: 15px;
  font-weight: 600;
  color: var(--paper);
}

.page-about .team-legend__desc {
  grid-column: 2;
  font-size: 14px;
  line-height: 1.7;
  color: var(--muted);
}

/* ---------- 赛时流程 ---------- */
.page-about .flow {
  list-style: none;
  margin: 18px 0 0;
  padding: 0;
  display: grid;
  gap: 2px;
}

.page-about .flow__item {
  display: grid;
  grid-template-columns: 74px minmax(0, 1fr);
  gap: 14px;
  padding: 14px 0;
  border-bottom: 1px solid var(--line);
}

.page-about .flow__stamp {
  margin: 0;
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.page-about .flow__num {
  font-family: var(--font-mono);
  font-size: 26px;
  line-height: 1;
  color: var(--cyan);
  font-variant-numeric: tabular-nums;
}

.page-about .flow__unit {
  font-size: 11px;
  letter-spacing: 0.1em;
  color: var(--muted);
}

.page-about .flow__body .ng-h3 {
  margin: 0 0 6px;
  font-size: 17px;
  font-weight: 600;
  line-height: 1.4;
}

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

/* ---------- 引用块 ---------- */
.page-about .about-quote {
  margin: 22px 0;
  padding: 20px 20px 18px 22px;
  background: var(--ink-2);
  border-left: 2px solid var(--violet);
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}

.page-about .about-quote__text {
  margin: 0 0 10px;
  font-family: var(--font-display);
  font-weight: 400;
  font-size: 19px;
  line-height: 1.5;
  color: var(--paper);
}

.page-about .about-quote__sign {
  margin: 0;
  font-size: 12px;
  letter-spacing: 0.12em;
  color: var(--muted);
}

/* ---------- 覆盖与合作 ---------- */
.page-about .reach-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 20px;
}

.page-about .reach-copy p {
  font-size: 15px;
  line-height: 1.8;
}

.page-about .reach-stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin-top: 22px;
  background: var(--line);
  border: 1px solid var(--line);
}

.page-about .reach-stat {
  background: var(--ink-2);
  padding: 16px 14px;
  display: grid;
  gap: 6px;
}

.page-about .reach-stat__num {
  font-family: var(--font-mono);
  font-size: 26px;
  line-height: 1;
  color: var(--amber);
  font-variant-numeric: tabular-nums;
}

.page-about .reach-stat__label {
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--muted);
}

/* ---------- 承诺列表 ---------- */
.page-about .about-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 0;
}

.page-about .about-list__item {
  display: grid;
  grid-template-columns: 30px minmax(0, 1fr);
  gap: 2px 12px;
  padding: 16px 0;
  border-bottom: 1px solid var(--line);
}

.page-about .about-list__num {
  font-family: var(--font-mono);
  font-size: 13px;
  line-height: 1.6;
  color: var(--cyan-deep);
}

.page-about .about-list__title {
  margin: 0;
  font-size: 17px;
  font-weight: 600;
  line-height: 1.45;
  color: var(--paper);
}

.page-about .about-list__item p {
  grid-column: 2;
  margin: 4px 0 0;
  font-size: 14px;
  line-height: 1.72;
  color: var(--muted);
}

/* ---------- 下一步 ---------- */
.page-about .about-section--next {
  padding-top: 34px;
}

.page-about .next-links {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 10px;
}

.page-about .next-links a {
  display: grid;
  gap: 6px;
  padding: 18px 18px 18px 20px;
  background: var(--ink-2);
  border-left: 2px solid var(--cyan-deep);
  text-decoration: none;
  color: var(--paper);
  transition: background 200ms var(--ease), border-color 200ms var(--ease), transform 200ms var(--ease);
}

.page-about .next-links a:hover,
.page-about .next-links a:focus-visible {
  background: var(--ink-3);
  border-left-color: var(--amber);
  transform: translateX(4px);
}

.page-about .next-links strong {
  font-size: 16px;
  font-weight: 600;
  letter-spacing: 0.01em;
}

.page-about .next-links span {
  font-size: 13px;
  line-height: 1.65;
  color: var(--muted);
}

/* ---------- 响应式 ---------- */
@media (min-width: 560px) {
  .page-about .team-bar__label {
    font-size: 11px;
  }

  .page-about .flow__item {
    grid-template-columns: 92px minmax(0, 1fr);
    gap: 18px;
  }

  .page-about .flow__num {
    font-size: 30px;
  }

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

@media (min-width: 980px) {
  .page-about {
    padding-bottom: 96px;
  }

  .page-about .about-shell {
    grid-template-columns: minmax(0, 1fr) minmax(0, 2.6fr);
    gap: 52px;
    padding-block: 48px 64px;
  }

  .page-about .about-rail {
    position: sticky;
    top: calc(var(--header-mobile) + 28px);
    padding-top: 18px;
  }

  .page-about .about-hero__lead {
    font-size: 17px;
  }

  .page-about .about-section {
    padding-top: 52px;
  }

  .page-about .about-section__head {
    grid-template-columns: 64px minmax(0, 1fr);
    align-items: baseline;
    gap: 14px;
  }

  .page-about .about-section__num {
    padding-top: 6px;
  }

  /* 横向刻度尺式版本时间线 */
  .page-about .version-track {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 24px;
    padding-top: 40px;
    position: relative;
  }

  .page-about .version-track::before {
    content: "";
    position: absolute;
    left: 0;
    right: 0;
    top: 9px;
    height: 2px;
    background: repeating-linear-gradient(
      90deg,
      var(--line-strong) 0 16px,
      transparent 16px 26px
    );
  }

  .page-about .version {
    padding: 0;
    border-left: 0;
    border-top: 0;
  }

  .page-about .version__dot {
    left: 0;
    top: 3px;
  }

  .page-about .version__year {
    font-size: 26px;
    margin-bottom: 6px;
  }

  .page-about .version__body p {
    font-size: 14px;
  }

  .page-about .version__note {
    max-height: 0;
    opacity: 0;
    overflow: hidden;
    padding-left: 0;
    border-left: 0;
    transition: max-height 260ms var(--ease), opacity 220ms var(--ease), padding 220ms var(--ease);
  }

  .page-about .version:hover .version__note,
  .page-about .version:focus-within .version__note {
    max-height: 6em;
    opacity: 1;
    padding-left: 10px;
    border-left: 1px solid var(--cyan-deep);
  }

  /* 团队条悬停说明 */
  .page-about .team-bar {
    margin-top: 24px;
  }

  .page-about .team-bar__seg {
    min-height: 96px;
    padding: 14px 14px 12px;
  }

  .page-about .team-bar__num {
    font-size: 30px;
  }

  .page-about .team-bar__tip {
    display: block;
    position: absolute;
    left: 0;
    bottom: calc(100% + 10px);
    width: max-content;
    max-width: 210px;
    padding: 8px 10px;
    background: var(--paper);
    color: var(--ink);
    font-size: 12px;
    line-height: 1.5;
    opacity: 0;
    visibility: hidden;
    transform: translateY(4px);
    transition: opacity 180ms var(--ease), transform 180ms var(--ease), visibility 180ms var(--ease);
    z-index: 2;
  }

  .page-about .team-bar__seg:hover .team-bar__tip,
  .page-about .team-bar__seg:focus-visible .team-bar__tip {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
  }

  .page-about .team-legend {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 18px;
  }

  .page-about .team-legend__item {
    grid-template-columns: 10px minmax(0, 1fr);
    border-bottom: 0;
    border-top: 1px solid var(--line);
    padding: 12px 0 0;
  }

  .page-about .team-legend__dot {
    margin-top: 7px;
  }

  .page-about .team-legend__desc {
    font-size: 13px;
  }

  .page-about .flow {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 0 32px;
  }

  .page-about .flow__item {
    grid-template-columns: 96px minmax(0, 1fr);
  }

  .page-about .reach-grid {
    grid-template-columns: minmax(0, 1.15fr) minmax(0, 1fr);
    gap: 28px;
    align-items: start;
  }

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

  .page-about .about-list {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 0 32px;
  }

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

@media (prefers-reduced-motion: reduce) {
  .page-about *,
  .page-about *::before,
  .page-about *::after {
    transition-duration: 0.01ms !important;
    animation-duration: 0.01ms !important;
  }

  .page-about .next-links a:hover,
  .page-about .next-links a:focus-visible {
    transform: none;
  }
}
<<<PAGE_CSS_DONE>>>