.page-about {
  --about-pad: clamp(3rem, 8vw, 6.5rem);
  --about-ink-rgb: 36, 28, 24;
  background: var(--ink);
  color: var(--gray);
  overflow-x: hidden;
}

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

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  padding-top: clamp(1.5rem, 4vw, 2.75rem);
}

.page-about .crumbs {
  margin-bottom: 1.5rem;
}

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

.page-about .about-hero__kick {
  color: var(--cyan);
  margin: 0 0 0.85rem;
}

.page-about .about-hero__title {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(2rem, 6.4vw, 4.25rem);
  line-height: 1.02;
  letter-spacing: -0.02em;
  color: var(--paper);
  margin: 0 0 2rem;
  max-width: 22ch;
}

.page-about .about-hero__grid {
  display: grid;
  gap: 2rem;
  padding-bottom: clamp(2rem, 5vw, 3.5rem);
}

.page-about .about-hero__lead {
  margin: 0;
  max-width: 38rem;
  font-size: 1.0625rem;
  line-height: 1.9;
  color: var(--silver);
}

.page-about .about-hero__stats {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 1rem;
  border-top: 1px solid var(--line-strong);
  padding-top: 1.25rem;
}

.page-about .about-hero__stats .statbig {
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
  min-width: 0;
}

.page-about .about-hero__stats .statbig__value {
  font-size: clamp(1.4rem, 4.6vw, 2.4rem);
  line-height: 1;
  letter-spacing: -0.04em;
  color: var(--cyan);
}

.page-about .about-hero__stats .statbig__label {
  font-size: 0.75rem;
  letter-spacing: 0.05em;
  color: var(--gray);
}

.page-about .about-hero__band {
  margin: 0;
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  overflow: hidden;
}

.page-about .about-hero__band img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  aspect-ratio: 4 / 1;
  object-fit: cover;
}

/* ---------- 章节条 ---------- */
.page-about .about-toc {
  background: var(--ink-green);
  border-bottom: 1px solid var(--line-strong);
}

.page-about .about-toc__inner {
  display: flex;
  gap: 0.25rem;
  overflow-x: auto;
  padding-block: 0.85rem;
  scrollbar-width: none;
}

.page-about .about-toc__inner::-webkit-scrollbar {
  display: none;
}

.page-about .about-toc__link {
  flex: 0 0 auto;
  display: inline-flex;
  align-items: baseline;
  gap: 0.5rem;
  padding: 0.4rem 0.7rem;
  font-size: 0.8125rem;
  color: var(--gray);
  text-decoration: none;
  border: 1px solid transparent;
  border-radius: var(--radius);
  white-space: nowrap;
  transition: color var(--dur) var(--ease), border-color var(--dur) var(--ease),
    background var(--dur) var(--ease);
}

.page-about .about-toc__link .mono {
  font-size: 0.6875rem;
  opacity: 0.85;
}

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

.page-about .about-toc__link[aria-current="true"] {
  color: var(--ink);
  background: var(--cyan);
  border-color: var(--cyan);
  font-weight: 700;
}

/* ---------- 区块外壳 ---------- */
.page-about .about-sec {
  position: relative;
  padding: var(--about-pad) 0;
}

.page-about .about-sec--ink {
  background: var(--ink);
}

.page-about .about-sec--green {
  background: var(--ink-green);
}

.page-about .about-sec--paper {
  background: var(--paper);
  color: rgba(36, 28, 24, 0.78);
}

.page-about .about-sec__head {
  max-width: 52rem;
  margin-bottom: clamp(1.75rem, 4.5vw, 3rem);
}

.page-about .about-sec--ink .eyebrow,
.page-about .about-sec--green .eyebrow,
.page-about .about-sec--cta .eyebrow {
  color: var(--orange);
}

.page-about .about-sec--paper .eyebrow {
  color: var(--rust);
}

.page-about .about-sec h2 {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(1.6rem, 4.4vw, 2.75rem);
  line-height: 1.08;
  letter-spacing: -0.02em;
  margin: 0.6rem 0 1rem;
  color: var(--paper);
  max-width: 26ch;
}

.page-about .about-sec--paper h2 {
  color: var(--brown);
}

.page-about .about-sec__lead {
  margin: 0;
  max-width: 40rem;
  font-size: 1rem;
  line-height: 1.9;
  color: var(--gray);
}

.page-about .about-sec--paper .about-sec__lead {
  color: rgba(36, 28, 24, 0.78);
}

/* ---------- 时间线 ---------- */
.page-about .about-sec--tl {
  overflow: hidden;
}

.page-about .tl-bg {
  position: absolute;
  inset: 0;
  z-index: 0;
  overflow: hidden;
}

.page-about .tl-bg img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: 0.14;
}

.page-about .about-sec--tl .shell {
  position: relative;
  z-index: 1;
}

.page-about .about-tl {
  position: relative;
  padding-left: 1.75rem;
}

.page-about .about-tl::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.9rem;
  bottom: 0.9rem;
  width: 3px;
  background: var(--line-strong);
}

.page-about .tl {
  position: relative;
  border-bottom: 1px solid var(--line);
}

.page-about .tl:last-child {
  border-bottom: 0;
}

.page-about .tl::before {
  content: "";
  position: absolute;
  left: calc(-1.75rem - 5.5px);
  top: 2.5rem;
  width: 14px;
  height: 14px;
  box-sizing: border-box;
  border-radius: 50%;
  background: var(--ink);
  border: 3px solid var(--silver);
  transition: background var(--dur) var(--ease), border-color var(--dur) var(--ease),
    box-shadow var(--dur) var(--ease);
}

.page-about .tl[open]::before {
  background: var(--orange);
  border-color: var(--orange);
  box-shadow: var(--glow);
}

.page-about .tl__head {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 0.4rem 1rem;
  align-items: center;
  padding: clamp(1.1rem, 3vw, 1.75rem) 0;
  cursor: pointer;
  list-style: none;
}

.page-about .tl__head::-webkit-details-marker {
  display: none;
}

.page-about .tl__head:focus-visible {
  outline: 2px solid var(--cyan);
  outline-offset: 4px;
}

.page-about .tl__year {
  grid-column: 1;
  grid-row: 1;
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: clamp(2.25rem, 8.5vw, 4.5rem);
  line-height: 0.86;
  letter-spacing: -0.04em;
  color: var(--silver);
  transition: color var(--dur) var(--ease);
}

.page-about .tl[open] .tl__year {
  color: var(--cyan);
}

.page-about .tl__sign {
  grid-column: 2;
  grid-row: 1;
  font-family: var(--font-mono);
  font-size: 1.35rem;
  line-height: 1;
  color: var(--orange);
}

.page-about .tl__sign::before {
  content: "+";
}

.page-about .tl[open] .tl__sign::before {
  content: "\2212";
}

.page-about .tl__meta {
  grid-column: 1 / -1;
  grid-row: 2;
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 0.5rem 0.9rem;
}

.page-about .tl__phase {
  font-size: 0.9375rem;
  letter-spacing: 0.04em;
  color: var(--paper);
}

.page-about .tl__ver {
  font-size: 0.75rem;
  color: var(--orange);
  border: 1px solid rgba(255, 106, 31, 0.5);
  border-radius: var(--radius);
  padding: 0.15rem 0.45rem;
}

.page-about .tl__body {
  padding: 0 0 clamp(1.25rem, 3vw, 2rem);
}

.page-about .tl__body p {
  margin: 0;
  max-width: 38rem;
  font-size: 0.9375rem;
  line-height: 1.9;
  color: var(--gray);
}

/* ---------- 覆盖 ---------- */
.page-about .cov {
  display: grid;
  gap: 1.5rem;
}

.page-about .cov__head {
  display: flex;
  align-items: baseline;
  gap: 0.85rem;
  flex-wrap: wrap;
}

.page-about .cov__pct {
  font-size: clamp(2.5rem, 9vw, 4.5rem);
  line-height: 0.9;
  letter-spacing: -0.05em;
  color: var(--cyan);
  font-weight: 700;
}

.page-about .cov__pctlab {
  font-size: 0.9375rem;
  color: var(--silver);
}

.page-about .cov__svg {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
}

.page-about .cov__axis,
.page-about .cov__tick {
  stroke: var(--line-strong);
  stroke-width: 2;
}

.page-about .cov__mark {
  stroke: var(--orange);
  stroke-width: 3;
}

.page-about .cov__dot {
  fill: var(--orange);
}

.page-about .cov__regions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  list-style: none;
  margin: 0;
  padding: 1.25rem 0 0;
  border-top: 1px solid var(--line);
}

/* ---------- 数据进库 ---------- */
.page-about .about-split {
  display: grid;
  gap: 2.5rem;
}

.page-about .about-split__fig {
  margin: 0;
}

.page-about .about-split__fig img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  border: 3px solid var(--brown);
  box-shadow: 8px 8px 0 rgba(36, 28, 24, 0.16);
  object-fit: cover;
}

.page-about .pipe {
  list-style: none;
  margin: 1.5rem 0 0;
  padding: 0;
  display: grid;
  gap: 1.25rem;
}

.page-about .pipe__item {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 0.45rem 1rem;
  border-top: 2px solid var(--brown);
  padding-top: 1rem;
}

.page-about .pipe__idx {
  grid-column: 1;
  font-size: 1.5rem;
  font-weight: 700;
  line-height: 1;
  color: var(--rust);
}

.page-about .pipe__item h3 {
  grid-column: 2;
  margin: 0;
  font-family: var(--font-display);
  font-size: 1.1875rem;
  letter-spacing: -0.01em;
  color: var(--brown);
}

.page-about .pipe__item p {
  grid-column: 2;
  margin: 0.35rem 0 0;
  font-size: 0.9375rem;
  line-height: 1.85;
  color: rgba(36, 28, 24, 0.76);
}

.page-about .about-note {
  margin: 1.75rem 0 0;
  padding: 0.85rem 1rem;
  border-left: 3px solid var(--rust);
  background: rgba(216, 69, 28, 0.08);
  font-size: 0.875rem;
  line-height: 1.75;
  color: rgba(36, 28, 24, 0.82);
}

/* ---------- 版本轨道 ---------- */
.page-about .verrail {
  list-style: none;
  margin: 0;
  padding: 0 0 0.5rem;
  display: flex;
  gap: 0.75rem;
  overflow-x: auto;
  scrollbar-width: thin;
}

.page-about .verrail__item {
  flex: 0 0 auto;
  min-width: 128px;
  display: flex;
  flex-direction: column;
  gap: 0.6rem;
  padding: 1rem;
  border: 1px solid var(--line-strong);
  border-radius: var(--radius);
  background: rgba(243, 238, 225, 0.03);
}

.page-about .verrail__idx {
  font-size: 1.75rem;
  line-height: 1;
  color: var(--silver);
}

.page-about .verrail__lab {
  font-size: 0.8125rem;
  color: var(--gray);
}

.page-about .verrail__item--now {
  border-color: var(--cyan);
  background: rgba(63, 224, 200, 0.1);
}

.page-about .verrail__item--now .verrail__idx {
  color: var(--cyan);
}

.page-about .verrail__item--now .verrail__lab {
  color: var(--paper);
}

/* ---------- 团队卡片 ---------- */
.page-about .about-cards {
  display: grid;
  gap: 1.25rem;
}

.page-about .about-cards .card {
  display: flex;
  flex-direction: column;
  gap: 0.6rem;
  height: 100%;
}

.page-about .about-cards .card__eyebrow {
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--rust);
  margin: 0;
}

.page-about .about-cards .card__title {
  font-family: var(--font-display);
  font-size: 1.25rem;
  letter-spacing: -0.01em;
  color: var(--brown);
  margin: 0;
}

.page-about .about-cards .card__body {
  margin: 0;
  font-size: 0.9375rem;
  line-height: 1.85;
  color: rgba(36, 28, 24, 0.76);
}

/* ---------- 资质 ---------- */
.page-about .about-records {
  display: grid;
  gap: 2.5rem;
}

.page-about .record-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 0.85rem;
}

.page-about .record-list li {
  display: flex;
  align-items: baseline;
  gap: 1rem;
  border-bottom: 1px solid var(--line);
  padding-bottom: 0.75rem;
}

.page-about .record-list .mono {
  font-size: 1.75rem;
  line-height: 1;
  color: var(--cyan);
}

.page-about .record-list span:last-child {
  font-size: 0.9375rem;
  color: var(--silver);
}

/* ---------- 原则 ---------- */
.page-about .principle {
  list-style: none;
  margin: 0;
  padding: 0;
}

.page-about .principle li {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 1rem;
  padding: 1.25rem 0;
  border-top: 1px solid var(--line);
}

.page-about .principle li:last-child {
  border-bottom: 1px solid var(--line);
}

.page-about .principle__idx {
  font-size: 0.8125rem;
  padding-top: 0.4rem;
  color: var(--orange);
}

.page-about .principle p {
  margin: 0;
  max-width: 44rem;
  font-size: 0.9375rem;
  line-height: 1.9;
  color: var(--gray);
}

.page-about .principle strong {
  color: var(--paper);
  font-weight: 700;
}

/* ---------- CTA ---------- */
.page-about .about-sec--cta {
  background: var(--ink-green);
  border-top: 1px solid var(--line-strong);
}

.page-about .about-cta__lead {
  margin: 0;
  max-width: 40rem;
  font-size: 1rem;
  line-height: 1.9;
  color: var(--silver);
}

.page-about .about-cta__btns {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin-top: 1.75rem;
}

/* ---------- 响应式 ---------- */
@media (min-width: 760px) {
  .page-about .about-cards {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

@media (min-width: 820px) {
  .page-about .tl::before {
    top: 2.9rem;
  }

  .page-about .tl__head {
    grid-template-columns: 190px 1fr auto;
    gap: 0 2rem;
    align-items: center;
  }

  .page-about .tl__year {
    grid-column: 1;
    grid-row: 1;
  }

  .page-about .tl__meta {
    grid-column: 2;
    grid-row: 1;
    flex-direction: column;
    align-items: flex-start;
    gap: 0.4rem;
  }

  .page-about .tl__sign {
    grid-column: 3;
    grid-row: 1;
  }

  .page-about .tl__body {
    padding-left: calc(190px + 2rem);
  }
}

@media (min-width: 900px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    gap: 3rem;
    align-items: end;
  }

  .page-about .about-split {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, 1fr);
    gap: 4rem;
    align-items: start;
  }

  .page-about .about-records {
    grid-template-columns: minmax(0, 1fr) minmax(0, 320px);
    gap: 4rem;
    align-items: start;
  }
}
<<<END>>>