.page-about {
  position: relative;
  overflow-x: clip;
  padding-bottom: 88px;
  background-image:
    radial-gradient(720px 400px at 92% -80px, rgba(198, 255, 61, 0.09), transparent 70%),
    radial-gradient(600px 360px at 4% 560px, rgba(47, 212, 255, 0.055), transparent 72%);
  background-repeat: no-repeat;
}

/* ---------- 面包屑 ---------- */
.page-about .about-crumbs {
  padding-top: 22px;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  padding: 18px 0 56px;
}

.page-about .about-hero__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 34px;
  align-items: center;
}

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

.page-about .about-hero__title {
  margin: 10px 0 22px;
  font-size: clamp(2.05rem, 7.2vw, 4.3rem);
  font-weight: 900;
  line-height: 1.04;
  letter-spacing: -0.025em;
  transform: skewX(-6deg);
  transform-origin: left bottom;
}

.page-about .about-hero__title span {
  display: block;
}

.page-about .about-hero__title span:last-child {
  color: var(--accent);
}

.page-about .about-hero__lede {
  max-width: 56ch;
  margin: 0 0 26px;
  font-size: clamp(0.98rem, 1.5vw, 1.08rem);
  line-height: 1.85;
  color: var(--muted);
}

.page-about .about-hero__meta {
  display: flex;
  flex-wrap: wrap;
  gap: 14px 34px;
  margin: 0;
  padding: 18px 0 0;
  list-style: none;
  border-top: 1px solid var(--line);
}

.page-about .about-hero__meta li {
  display: flex;
  flex-direction: column;
  gap: 3px;
}

.page-about .about-hero__meta-num {
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: 1.12rem;
  letter-spacing: -0.01em;
  color: var(--text);
}

.page-about .about-hero__meta-label {
  font-size: 0.76rem;
  letter-spacing: 0.06em;
  color: var(--muted);
}

.page-about .about-hero__figure {
  position: relative;
  margin: 0;
}

.page-about .about-hero__figure::after {
  content: "";
  position: absolute;
  right: -10px;
  top: -10px;
  width: 54px;
  height: 54px;
  border-top: 1px solid rgba(198, 255, 61, 0.55);
  border-right: 1px solid rgba(198, 255, 61, 0.55);
  pointer-events: none;
}

/* ---------- 外壳与章节索引 ---------- */
.page-about .about-shell {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
}

.page-about .about-index {
  display: none;
}

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

.page-about .about-index .index-nav {
  display: flex;
  flex-direction: column;
  border-left: 1px solid var(--line);
}

.page-about .about-index .index-nav__link {
  display: block;
  margin-left: -1px;
  padding: 8px 0 8px 16px;
  font-size: 0.85rem;
  line-height: 1.5;
  color: var(--muted);
  text-decoration: none;
  border-left: 1px solid transparent;
  transition: color 0.28s var(--ease), border-color 0.28s var(--ease);
}

.page-about .about-index .index-nav__link:hover {
  color: var(--text);
}

.page-about .about-index .index-nav__link[aria-current] {
  color: var(--accent);
  border-left-color: var(--accent);
}

/* ---------- 章节骨架 ---------- */
.page-about .about-section {
  padding: 48px 0;
  border-top: 1px solid var(--line);
  scroll-margin-top: calc(var(--header-h-compact) + 28px);
}

.page-about .about-section__head {
  max-width: 46ch;
  margin-bottom: 28px;
}

.page-about .about-section__head .eyebrow {
  margin-bottom: 10px;
}

.page-about .about-section__title {
  margin: 0;
  font-size: clamp(1.42rem, 3.6vw, 2.25rem);
  font-weight: 900;
  line-height: 1.16;
  letter-spacing: -0.02em;
  transform: skewX(-6deg);
  transform-origin: left center;
}

.page-about .about-section__prose {
  max-width: 66ch;
}

.page-about .about-section__prose p {
  margin: 0 0 1.2em;
  font-size: 1rem;
  line-height: 1.85;
  color: var(--text);
}

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

.page-about .about-figure {
  margin: 0 0 40px;
  max-width: 100%;
}

/* ---------- 版本时间线 ---------- */
.page-about .timeline {
  position: relative;
  margin: 0;
  padding: 4px 0 0;
  list-style: none;
}

.page-about .timeline::before {
  content: "";
  position: absolute;
  left: 7px;
  top: 14px;
  bottom: 0;
  width: 1px;
  background: linear-gradient(
    180deg,
    var(--accent) 0%,
    rgba(47, 212, 255, 0.5) 36%,
    rgba(34, 48, 58, 0.85) 100%
  );
}

.page-about .tl-item {
  position: relative;
  padding: 0 0 42px 36px;
}

.page-about .tl-item:last-child {
  padding-bottom: 6px;
}

.page-about .tl-item::before {
  content: "";
  position: absolute;
  left: 0;
  top: 5px;
  width: 15px;
  height: 15px;
  border-radius: 50%;
  border: 1px solid var(--accent);
  background: var(--ink);
  box-shadow: 0 0 0 5px rgba(198, 255, 61, 0.07);
}

.page-about .tl-item::after {
  content: "";
  position: absolute;
  left: 5px;
  top: 10px;
  width: 5px;
  height: 5px;
  border-radius: 50%;
  background: var(--accent);
}

.page-about .tl-ver {
  margin: 0 0 6px;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--accent);
}

.page-about .tl-title {
  margin: 0 0 10px;
  font-size: clamp(1.14rem, 2.4vw, 1.6rem);
  font-weight: 900;
  line-height: 1.25;
  letter-spacing: -0.01em;
}

.page-about .tl-text {
  margin: 0 0 14px;
  max-width: 62ch;
  font-size: 0.97rem;
  line-height: 1.8;
  color: var(--muted);
}

.page-about .tl-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .tl-tags li {
  padding: 4px 12px;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: var(--panel);
  font-size: 0.75rem;
  letter-spacing: 0.04em;
  color: var(--muted);
}

/* ---------- 数据来源 ---------- */
.page-about .src-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin: 0 0 28px;
  background: var(--line);
  border: 1px solid var(--line);
  border-radius: 4px;
  overflow: hidden;
}

.page-about .src-cell {
  display: flex;
  flex-direction: column;
  gap: 7px;
  padding: 24px 18px;
  background: var(--panel);
}

.page-about .src-cell__num {
  margin: 0;
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: clamp(1.6rem, 4vw, 2.3rem);
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--accent);
}

.page-about .src-cell:nth-child(2) .src-cell__num {
  color: var(--data);
}

.page-about .src-cell:nth-child(4) .src-cell__num {
  color: var(--alert);
}

.page-about .src-cell__label {
  margin: 0;
  font-size: 0.9rem;
  font-weight: 700;
  color: var(--text);
}

.page-about .src-cell__desc {
  margin: 0;
  font-size: 0.79rem;
  line-height: 1.7;
  color: var(--muted);
}

.page-about .cadence {
  border-top: 1px solid var(--line);
  margin-bottom: 28px;
}

.page-about .cadence__row {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 4px;
  padding: 15px 0;
  border-bottom: 1px solid var(--line);
}

.page-about .cadence__key {
  font-size: 0.8rem;
  letter-spacing: 0.08em;
  color: var(--muted);
}

.page-about .cadence__val {
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: 0.98rem;
  color: var(--text);
}

.page-about .cadence__note {
  font-size: 0.85rem;
  line-height: 1.7;
  color: var(--muted);
}

/* ---------- 团队 ---------- */
.page-about .team-block {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 28px;
  align-items: start;
}

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

.page-about .team-block__body {
  min-width: 0;
}

.page-about .team-block__body p {
  margin: 0 0 1.2em;
  font-size: 1rem;
  line-height: 1.85;
  color: var(--text);
}

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

.page-about .team-facts {
  display: flex;
  flex-wrap: wrap;
  gap: 14px 34px;
  margin: 30px 0 0;
  padding: 18px 0 0;
  list-style: none;
  border-top: 1px solid var(--line);
}

.page-about .team-fact {
  display: flex;
  flex-direction: column;
  gap: 3px;
}

.page-about .team-fact__num {
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: 1.28rem;
  letter-spacing: -0.02em;
  color: var(--accent);
}

.page-about .team-fact__label {
  font-size: 0.78rem;
  color: var(--muted);
}

.page-about .scale-strip__lede {
  max-width: 62ch;
  margin: 38px 0 18px;
  font-size: 0.97rem;
  line-height: 1.85;
  color: var(--muted);
}

.page-about .scale-strip {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(124px, 1fr));
  gap: 20px 18px;
  margin: 0;
  padding: 24px 22px;
  list-style: none;
  border: 1px solid var(--line);
  border-radius: 4px;
  background: linear-gradient(142deg, rgba(15, 36, 24, 0.92), rgba(11, 16, 21, 0.94));
}

.page-about .scale-item {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.page-about .scale-item__num {
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: clamp(1.1rem, 2.2vw, 1.45rem);
  line-height: 1.1;
  letter-spacing: -0.02em;
  color: var(--text);
}

.page-about .scale-item__label {
  font-size: 0.77rem;
  line-height: 1.6;
  color: var(--muted);
}

/* ---------- 合作与认可 ---------- */
.page-about .partner-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 20px;
}

.page-about .partner-card {
  padding: 26px 22px 24px;
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 4px;
  transition: transform 0.36s var(--ease), border-color 0.36s var(--ease);
}

.page-about .partner-card:hover {
  transform: translateY(-4px);
  border-color: rgba(198, 255, 61, 0.55);
}

.page-about .partner-card__num {
  margin: 0 0 10px;
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: 1.85rem;
  line-height: 1;
  color: var(--accent);
}

.page-about .partner-card__title {
  margin: 0 0 12px;
  font-size: 1.08rem;
  font-weight: 900;
  line-height: 1.35;
  letter-spacing: -0.01em;
}

.page-about .partner-card__text {
  margin: 0;
  font-size: 0.93rem;
  line-height: 1.8;
  color: var(--muted);
}

/* ---------- 收尾入口 ---------- */
.page-about .about-next__lede {
  max-width: 52ch;
  margin: -6px 0 24px;
  font-size: 0.98rem;
  line-height: 1.8;
  color: var(--muted);
}

.page-about .about-next__links {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 14px;
}

.page-about .next-link {
  display: grid;
  grid-template-columns: 44px minmax(0, 1fr);
  column-gap: 14px;
  row-gap: 4px;
  padding: 20px 20px 18px;
  background: var(--panel);
  border: 1px solid var(--line);
  border-left: 2px solid var(--accent);
  border-radius: 3px;
  text-decoration: none;
  color: inherit;
  transition: transform 0.36s var(--ease), background-color 0.36s var(--ease);
}

.page-about .next-link:hover {
  transform: translateX(4px);
  background: var(--panel-2);
}

.page-about .next-link__num {
  grid-row: span 2;
  font-family: var(--font-mono);
  font-size: 1.15rem;
  font-weight: 700;
  line-height: 1.35;
  color: var(--accent);
}

.page-about .next-link__title {
  font-size: 1rem;
  font-weight: 700;
  line-height: 1.4;
  color: var(--text);
}

.page-about .next-link__desc {
  font-size: 0.84rem;
  line-height: 1.7;
  color: var(--muted);
}

/* ---------- 断点 ---------- */
@media (min-width: 720px) {
  .page-about .cadence__row {
    grid-template-columns: 120px 200px minmax(0, 1fr);
    gap: 22px;
    align-items: baseline;
  }

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

@media (min-width: 760px) {
  .page-about .src-grid {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .page-about .partner-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 24px;
  }
}

@media (min-width: 900px) {
  .page-about .about-hero {
    padding: 34px 0 72px;
  }

  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 1fr) minmax(0, 0.8fr);
    gap: 56px;
  }

  .page-about .team-block {
    grid-template-columns: minmax(0, 5fr) minmax(0, 6fr);
    gap: 42px;
  }
}

@media (min-width: 1080px) {
  .page-about .about-shell {
    grid-template-columns: 188px minmax(0, 1fr);
    column-gap: 68px;
  }

  .page-about .about-index {
    display: block;
    align-self: start;
    position: sticky;
    top: calc(var(--header-h-compact) + 32px);
    padding-top: 52px;
  }

  .page-about .about-section {
    padding: 56px 0;
  }
}

@media (min-width: 1280px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 1fr) minmax(0, 0.76fr);
    gap: 68px;
  }
}
<<<END>>>