.page-about {
  background: var(--lf-paper);
  color: var(--lf-text);
  font-family: var(--lf-font-body);
  --about-card-bg: #ffffff;
  --about-hair: rgba(255, 255, 255, 0.16);
}

.page-about .accent {
  color: var(--lf-brand);
}

.page-about .mono {
  font-family: var(--lf-font-mono);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  padding: clamp(28px, 4vw, 48px) 0 clamp(40px, 6vw, 76px);
}

.page-about .about-hero__inner {
  display: grid;
  gap: clamp(28px, 4vw, 44px);
}

.page-about .breadcrumb a {
  color: var(--lf-muted);
  text-decoration: none;
  border-bottom: 1px solid transparent;
}

.page-about .breadcrumb a:hover,
.page-about .breadcrumb a:focus-visible {
  color: var(--lf-brand);
  border-bottom-color: currentColor;
}

.page-about .about-hero h1 {
  font-family: var(--lf-font-display);
  font-weight: 900;
  font-size: clamp(2rem, 5.2vw, 3.7rem);
  line-height: 1.06;
  letter-spacing: -0.02em;
  margin: 16px 0 20px;
  max-width: 15em;
}

.page-about .about-hero__lede {
  font-size: clamp(16px, 1.8vw, 17.5px);
  line-height: 1.78;
  color: var(--lf-muted);
  max-width: 34em;
}

.page-about .about-hero__actions {
  margin-top: 26px;
  gap: 12px;
}

.page-about .facts {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--lf-line);
  border: 1px solid var(--lf-line);
  border-radius: var(--lf-radius);
  overflow: hidden;
}

.page-about .fact {
  background: var(--lf-paper);
  padding: 18px 16px;
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.page-about .fact__num {
  font-family: var(--lf-font-mono);
  font-size: clamp(1.25rem, 2.6vw, 1.55rem);
  font-weight: 700;
  letter-spacing: 0.02em;
  color: var(--lf-brand);
  line-height: 1;
}

.page-about .fact__label {
  font-size: 12.5px;
  letter-spacing: 0.02em;
  color: var(--lf-muted);
  line-height: 1.5;
}

/* ---------- 通用章节 ---------- */
.page-about .about-section {
  padding: clamp(48px, 6.5vw, 96px) 0;
  border-top: 1px solid var(--lf-line);
}

.page-about h2 {
  font-family: var(--lf-font-display);
  font-weight: 900;
  font-size: clamp(1.5rem, 3.6vw, 2.45rem);
  line-height: 1.14;
  letter-spacing: -0.02em;
  margin: 14px 0 18px;
}

.page-about h3 {
  font-family: var(--lf-font-display);
  font-weight: 900;
  font-size: clamp(1.05rem, 2vw, 1.3rem);
  line-height: 1.35;
  letter-spacing: -0.01em;
}

.page-about p {
  line-height: 1.78;
  max-width: 40em;
}

.page-about .eyebrow--light {
  color: rgba(255, 255, 255, 0.64);
}

.page-about .figure__frame {
  position: relative;
  border-radius: var(--lf-radius);
  overflow: hidden;
  border: 1px solid var(--lf-line);
  background:
    repeating-linear-gradient(0deg, rgba(15, 36, 56, 0.06) 0 1px, transparent 1px 22px),
    repeating-linear-gradient(90deg, rgba(15, 36, 56, 0.06) 0 1px, transparent 1px 22px),
    var(--lf-paper);
}

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

.page-about .figure__caption {
  font-family: var(--lf-font-mono);
  font-size: 12px;
  letter-spacing: 0.04em;
  color: var(--lf-muted);
  margin-top: 10px;
}

/* ---------- 版本演进 ---------- */
.page-about .versions__intro {
  display: grid;
  gap: clamp(26px, 4vw, 40px);
  margin-bottom: clamp(32px, 5vw, 60px);
}

.page-about .versions__lede p + p {
  margin-top: 14px;
}

.page-about .versions__lede a,
.page-about .next__copy a {
  color: var(--lf-brand);
  text-decoration: none;
  border-bottom: 1px solid rgba(201, 51, 26, 0.4);
}

.page-about .versions__lede a:hover,
.page-about .next__copy a:hover {
  border-bottom-color: var(--lf-brand);
}

.page-about .versions__fig {
  margin: 0;
  max-width: 340px;
}

.page-about .versions__fig .figure__frame {
  aspect-ratio: 2 / 3;
}

.page-about .timeline {
  display: grid;
  gap: 24px;
}

.page-about .years__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  gap: 6px;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
}

.page-about .years__link {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 9px 12px;
  white-space: nowrap;
  text-decoration: none;
  color: var(--lf-muted);
  border: 1px solid var(--lf-line);
  border-radius: 999px;
  background: var(--about-card-bg);
  transition: color 0.2s ease, border-color 0.2s ease, background 0.2s ease;
}

.page-about .years__link::before {
  content: "";
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--lf-line);
  flex: none;
}

.page-about .years__num {
  font-family: var(--lf-font-mono);
  font-size: 12.5px;
  letter-spacing: 0.06em;
}

.page-about .years__link:hover,
.page-about .years__link:focus-visible {
  color: var(--lf-brand);
  border-color: var(--lf-brand);
  background: #fff;
}

.page-about .years__link:hover::before,
.page-about .years__link:focus-visible::before {
  background: var(--lf-spark);
}

.page-about .timeline__flow {
  display: grid;
  gap: 18px;
  min-width: 0;
}

.page-about .era {
  position: relative;
  background: var(--about-card-bg);
  border: 1px solid var(--lf-line);
  border-radius: var(--lf-radius);
  padding: clamp(20px, 3vw, 30px);
}

.page-about .era::before {
  content: "";
  position: absolute;
  left: -1px;
  top: 26px;
  bottom: 26px;
  width: 3px;
  border-radius: 0 2px 2px 0;
  background: var(--lf-line);
}

.page-about .era--start::before {
  background: var(--lf-muted);
}

.page-about .era--v2::before {
  background: var(--lf-warn);
}

.page-about .era--v3::before {
  background: var(--lf-ink-2);
}

.page-about .era--v4::before {
  background: var(--lf-brand);
}

.page-about .era__tag {
  display: inline-block;
  font-family: var(--lf-font-mono);
  font-size: 11.5px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  padding: 4px 10px;
  border-radius: 999px;
  border: 1px solid var(--lf-line);
  background: var(--lf-paper);
  color: var(--lf-muted);
  margin-bottom: 12px;
}

.page-about .era__tag--warn {
  color: #7a5400;
  background: rgba(242, 178, 51, 0.16);
  border-color: rgba(242, 178, 51, 0.55);
}

.page-about .era__tag--brand {
  color: #fff;
  background: var(--lf-brand);
  border-color: var(--lf-brand);
}

.page-about .era p {
  color: var(--lf-muted);
  font-size: 15.5px;
  margin-top: 10px;
}

.page-about .era__list {
  list-style: none;
  margin: 16px 0 0;
  padding: 0;
  display: grid;
  gap: 8px;
}

.page-about .era__list li {
  position: relative;
  padding-left: 20px;
  font-size: 14px;
  color: var(--lf-text);
  line-height: 1.6;
}

.page-about .era__list li::before {
  content: "—";
  position: absolute;
  left: 0;
  color: var(--lf-brand-lift);
  font-family: var(--lf-font-mono);
}

.page-about .era__link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  margin-top: 18px;
  font-size: 14.5px;
  font-weight: 600;
  color: var(--lf-brand);
  text-decoration: none;
  border-bottom: 1px solid rgba(201, 51, 26, 0.4);
  padding-bottom: 2px;
}

.page-about .era__link:hover {
  border-bottom-color: var(--lf-brand);
}

/* ---------- 团队 ---------- */
.page-about .team-band {
  background: var(--lf-ink);
  color: #fff;
  border-top: 0;
}

.page-about .team-band h2 {
  color: #fff;
}

.page-about .team-band__head {
  display: grid;
  gap: clamp(26px, 4vw, 44px);
  margin-bottom: clamp(28px, 4vw, 46px);
}

.page-about .team-band__copy p {
  color: rgba(255, 255, 255, 0.72);
  margin-top: 8px;
}

.page-about .team-band__fig {
  margin: 0;
}

.page-about .team-band__fig .figure__frame {
  aspect-ratio: 3 / 2;
  border-color: var(--about-hair);
  background:
    repeating-linear-gradient(0deg, rgba(255, 255, 255, 0.07) 0 1px, transparent 1px 20px),
    repeating-linear-gradient(90deg, rgba(255, 255, 255, 0.07) 0 1px, transparent 1px 20px),
    var(--lf-ink-2);
}

.page-about .team-band__fig .figure__caption {
  color: rgba(255, 255, 255, 0.55);
}

.page-about .roles {
  display: grid;
  gap: 1px;
  background: var(--about-hair);
  border: 1px solid var(--about-hair);
  border-radius: var(--lf-radius);
  overflow: hidden;
}

.page-about .role {
  background: var(--lf-ink);
  padding: 24px 22px;
  transition: background 0.24s ease;
}

.page-about .role:hover,
.page-about .role:focus,
.page-about .role:focus-visible {
  background: var(--lf-ink-2);
  outline: none;
}

.page-about .role:focus-visible {
  box-shadow: inset 0 0 0 2px var(--lf-spark);
}

.page-about .role__num {
  font-family: var(--lf-font-mono);
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--lf-spark);
}

.page-about .role__name {
  color: #fff;
  margin: 8px 0 6px;
}

.page-about .role__count {
  font-family: var(--lf-font-mono);
  font-size: 13px;
  letter-spacing: 0.04em;
  color: rgba(255, 255, 255, 0.6);
}

.page-about .role__count-num {
  color: var(--lf-spark);
  font-size: 15px;
  font-weight: 700;
}

.page-about .role__duty {
  margin-top: 12px;
  font-size: 14.5px;
  line-height: 1.7;
  color: rgba(255, 255, 255, 0.86);
  max-width: none;
}

.page-about .role__more {
  margin: 12px 0 0;
  padding-top: 10px;
  border-top: 1px dashed var(--about-hair);
  font-size: 13px;
  line-height: 1.7;
  color: rgba(255, 255, 255, 0.62);
  max-width: none;
}

.page-about .team-band__note {
  margin-top: 20px;
  font-size: 13.5px;
  color: rgba(255, 255, 255, 0.6);
  max-width: 46em;
}

/* ---------- 文档 ---------- */
.page-about .docs__head {
  max-width: 48em;
}

.page-about .docs__head p {
  color: var(--lf-muted);
  margin-top: 6px;
}

.page-about .docs__fig {
  margin: clamp(26px, 4vw, 40px) 0 0;
}

.page-about .docs__fig .figure__frame {
  aspect-ratio: 11 / 7;
}

.page-about .docs__grid {
  display: grid;
  gap: 16px;
  margin-top: clamp(24px, 4vw, 36px);
}

.page-about .docs__block {
  background: var(--about-card-bg);
  border: 1px solid var(--lf-line);
  border-radius: var(--lf-radius);
  padding: clamp(20px, 2.6vw, 26px);
}

.page-about .docs__block p {
  margin-top: 10px;
  font-size: 14.5px;
  line-height: 1.75;
  color: var(--lf-muted);
}

.page-about .chips {
  list-style: none;
  margin: 16px 0 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 7px;
}

.page-about .chip {
  font-family: var(--lf-font-mono);
  font-size: 11.5px;
  letter-spacing: 0.04em;
  padding: 5px 10px;
  border-radius: 999px;
  border: 1px solid var(--lf-line);
  background: var(--lf-paper);
  color: var(--lf-muted);
}

/* ---------- 兼容 ---------- */
.page-about .compat__head {
  max-width: 44em;
}

.page-about .compat__head p {
  color: var(--lf-muted);
  margin-top: 6px;
}

.page-about .compat__grid {
  display: grid;
  gap: 16px;
  margin-top: clamp(26px, 4vw, 40px);
}

.page-about .compat__panel {
  border: 1px solid var(--lf-line);
  border-radius: var(--lf-radius);
  background: var(--about-card-bg);
  padding: clamp(22px, 3vw, 30px);
}

.page-about .compat__panel p {
  margin-top: 10px;
  font-size: 14.5px;
  line-height: 1.75;
  color: var(--lf-muted);
}

.page-about .compat__panel--ink {
  background: var(--lf-ink-2);
  border-color: var(--lf-ink-2);
  color: #fff;
}

.page-about .compat__panel--ink h3 {
  color: #fff;
}

.page-about .compat__panel--ink p {
  color: rgba(255, 255, 255, 0.74);
}

.page-about .compat__panel--ink .chip {
  background: rgba(255, 255, 255, 0.08);
  border-color: var(--about-hair);
  color: rgba(255, 255, 255, 0.78);
}

.page-about .compat__foot {
  margin-top: 16px !important;
  padding-top: 14px;
  border-top: 1px dashed var(--about-hair);
  font-size: 13.5px !important;
}

.page-about .compat__foot a {
  color: var(--lf-spark);
  text-decoration: none;
  border-bottom: 1px solid rgba(255, 122, 69, 0.5);
}

.page-about .compat__foot a:hover {
  border-bottom-color: var(--lf-spark);
}

/* ---------- 信赖依据 ---------- */
.page-about .trust__head {
  max-width: 44em;
}

.page-about .trust__head p {
  color: var(--lf-muted);
  margin-top: 6px;
}

.page-about .badges {
  list-style: none;
  margin: clamp(24px, 4vw, 38px) 0;
  padding: 0;
  display: grid;
  gap: 14px;
}

.page-about .badge {
  display: flex;
  align-items: flex-start;
  gap: 14px;
  padding: 18px;
  border: 1px solid var(--lf-line);
  border-radius: var(--lf-radius);
  background: var(--about-card-bg);
}

.page-about .badge svg {
  flex: none;
  margin-top: 2px;
}

.page-about .badge__body {
  display: block;
  min-width: 0;
}

.page-about .badge__title {
  display: block;
  font-weight: 600;
  font-size: 14.5px;
  line-height: 1.5;
  color: var(--lf-text);
}

.page-about .badge__meta {
  display: block;
  margin-top: 4px;
  font-size: 12.5px;
  line-height: 1.6;
  color: var(--lf-muted);
}

.page-about .metrics {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--lf-line);
  border: 1px solid var(--lf-line);
  border-radius: var(--lf-radius);
  overflow: hidden;
}

.page-about .metric {
  background: var(--lf-paper);
  padding: 20px 18px;
}

.page-about .metric__num {
  display: block;
  font-family: var(--lf-font-display);
  font-weight: 900;
  font-size: clamp(1.45rem, 3vw, 1.95rem);
  line-height: 1;
  letter-spacing: -0.01em;
  color: var(--lf-brand);
}

.page-about .metric__unit {
  font-size: 0.56em;
  margin-left: 3px;
  letter-spacing: 0;
}

.page-about .metric__label {
  display: block;
  margin-top: 8px;
  font-size: 12.5px;
  line-height: 1.55;
  color: var(--lf-muted);
}

/* ---------- 下一步 ---------- */
.page-about .next {
  background: var(--lf-ink-2);
  color: #fff;
  border-top: 0;
}

.page-about .next h2 {
  color: #fff;
}

.page-about .next__inner {
  display: grid;
  gap: clamp(28px, 4vw, 56px);
}

.page-about .next__copy p {
  color: rgba(255, 255, 255, 0.76);
  margin-top: 10px;
}

.page-about .next__copy a,
.page-about .next__copy a:hover {
  color: var(--lf-spark);
  border-bottom-color: rgba(255, 122, 69, 0.5);
}

.page-about .next__contact {
  font-size: 13.5px;
  line-height: 1.8;
  color: rgba(255, 255, 255, 0.6) !important;
  margin-top: 18px;
  padding-top: 16px;
  border-top: 1px dashed var(--about-hair);
}

.page-about .next__link {
  display: block;
  padding: 16px 0;
  text-decoration: none;
  color: #fff;
  font-family: var(--lf-font-display);
  font-weight: 900;
  font-size: 1.05rem;
  border-top: 1px solid var(--about-hair);
  transition: color 0.2s ease, padding-left 0.2s ease;
}

.page-about .next__link:last-child {
  border-bottom: 1px solid var(--about-hair);
}

.page-about .next__link span {
  display: block;
  margin-top: 5px;
  font-family: var(--lf-font-body);
  font-weight: 400;
  font-size: 13.5px;
  line-height: 1.6;
  color: rgba(255, 255, 255, 0.62);
}

.page-about .next__link:hover,
.page-about .next__link:focus-visible {
  color: var(--lf-spark);
  padding-left: 8px;
}

/* ---------- 响应式 ---------- */
@media (min-width: 640px) {
  .page-about .roles {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

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

@media (min-width: 768px) {
  .page-about .docs__grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

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

@media (min-width: 900px) {
  .page-about .about-hero__inner {
    grid-template-columns: minmax(0, 1.4fr) minmax(0, 0.6fr);
    align-items: end;
    gap: clamp(32px, 5vw, 64px);
  }

  .page-about .versions__intro {
    grid-template-columns: minmax(0, 1fr) minmax(0, 340px);
    align-items: start;
    gap: clamp(32px, 5vw, 68px);
  }

  .page-about .versions__fig {
    justify-self: end;
    margin-top: 6px;
  }

  .page-about .timeline {
    grid-template-columns: 96px minmax(0, 1fr);
    gap: clamp(24px, 4vw, 52px);
    align-items: start;
  }

  .page-about .years {
    position: sticky;
    top: 96px;
  }

  .page-about .years__list {
    flex-direction: column;
    gap: 0;
    overflow: visible;
  }

  .page-about .years__link {
    width: 100%;
    border-radius: 0;
    border: 0;
    border-bottom: 1px solid var(--lf-line);
    background: transparent;
    padding: 14px 2px;
    justify-content: flex-start;
  }

  .page-about .years__link:hover,
  .page-about .years__link:focus-visible {
    background: transparent;
  }

  .page-about .team-band__head {
    grid-template-columns: minmax(0, 1fr) minmax(0, 0.85fr);
    align-items: center;
  }

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

  .page-about .next__inner {
    grid-template-columns: minmax(0, 0.95fr) minmax(0, 1.05fr);
    align-items: start;
  }
}

@media (min-width: 1024px) {
  .page-about .docs__grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

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

@media (min-width: 1080px) {
  .page-about .roles {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .page-about .role__more {
    max-height: 0;
    opacity: 0;
    overflow: hidden;
    margin-top: 0;
    padding-top: 0;
    border-top-color: transparent;
    transition: max-height 0.3s ease, opacity 0.3s ease, margin-top 0.3s ease,
      padding-top 0.3s ease, border-color 0.3s ease;
  }

  .page-about .role:hover .role__more,
  .page-about .role:focus .role__more,
  .page-about .role:focus-within .role__more {
    max-height: 12em;
    opacity: 1;
    margin-top: 12px;
    padding-top: 10px;
    border-top-color: var(--about-hair);
  }
}

@media (min-width: 1200px) {
  .page-about .era--v2 {
    margin-left: 6%;
  }

  .page-about .era--v3 {
    margin-left: 12%;
  }

  .page-about .era--v4 {
    margin-left: 18%;
  }
}

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

  .page-about .role__more {
    max-height: none;
    opacity: 1;
  }

  .page-about .next__link:hover,
  .page-about .next__link:focus-visible {
    padding-left: 0;
  }
}
<<<END>>>