.page-about {
  --about-rail: 208px;
  --about-gap: clamp(22px, 4vw, 56px);
  --about-line: rgba(196, 188, 171, 0.55);
  padding-block: clamp(20px, 3vw, 36px) clamp(64px, 8vw, 112px);
  background: var(--paper);
  color: var(--ink);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  margin-top: clamp(18px, 3vw, 34px);
  max-width: 66rem;
}

.page-about .about-hero .mono-label {
  color: var(--apricot-deep);
}

.page-about .about-hero h1 {
  margin: 0.4em 0 0.55em;
  max-width: 17ch;
  font-size: var(--fs-display);
  font-weight: 400;
  line-height: 1.06;
  letter-spacing: -0.02em;
  color: var(--ink-green);
}

.page-about .about-hero .lede {
  max-width: 68ch;
  font-size: var(--fs-base);
  line-height: 1.75;
  color: var(--slate);
}

.page-about .about-facts {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(148px, 1fr));
  gap: 1px;
  margin: clamp(26px, 4vw, 42px) 0 0;
  background: var(--about-line);
  border-radius: var(--radius-md);
  overflow: hidden;
  box-shadow: var(--shadow-card);
}

.page-about .about-facts > div {
  background: var(--card);
  padding: 16px 18px 18px;
}

.page-about .about-facts dt {
  font-family: var(--font-mono);
  font-size: var(--fs-xs);
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--apricot-deep);
}

.page-about .about-facts dd {
  margin: 8px 0 0;
  font-size: var(--fs-md);
  font-weight: 500;
  line-height: 1.2;
  color: var(--ink-green);
  letter-spacing: -0.01em;
}

/* ---------- 左侧印章栏 + 主内容 ---------- */
.page-about .about-frame {
  display: grid;
  gap: var(--about-gap);
  margin-top: clamp(42px, 6vw, 76px);
}

.page-about .about-rail {
  display: flex;
  align-items: center;
  gap: 16px;
  overflow-x: auto;
  padding-bottom: 6px;
  scrollbar-width: thin;
}

.page-about .about-rail__seal {
  flex: 0 0 auto;
  width: 62px;
  height: 62px;
  display: grid;
  place-items: center;
  align-content: center;
  gap: 1px;
  border-radius: 50%;
  border: 2px dashed var(--seal);
  background: radial-gradient(circle at 34% 28%, #fff9ef, var(--apricot-sand));
  color: var(--ink-green);
  text-align: center;
  line-height: 1.1;
}

.page-about .about-rail__seal-no {
  font-family: var(--font-mono);
  font-size: 19px;
  font-weight: 600;
  letter-spacing: 0.04em;
}

.page-about .about-rail__seal-cap {
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.06em;
  color: var(--apricot-deep);
}

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

.page-about .about-rail__list a {
  display: inline-flex;
  align-items: baseline;
  gap: 6px;
  padding: 5px 12px;
  border-radius: var(--radius-pill);
  border: 1px solid transparent;
  text-decoration: none;
  font-family: var(--font-mono);
  font-size: var(--fs-xs);
  letter-spacing: 0.06em;
  color: var(--slate);
  transition: border-color 0.15s var(--ease), color 0.15s var(--ease), background-color 0.15s var(--ease);
}

.page-about .about-rail__list a:hover,
.page-about .about-rail__list a:focus-visible {
  border-color: var(--apricot);
  color: var(--apricot-deep);
  background: rgba(217, 130, 43, 0.09);
}

.page-about .rail-tag {
  color: var(--route);
}

@media (min-width: 960px) {
  .page-about .about-frame {
    grid-template-columns: var(--about-rail) minmax(0, 1fr);
    align-items: start;
  }

  .page-about .about-rail {
    position: sticky;
    top: 112px;
    display: block;
    overflow: visible;
    padding-bottom: 0;
  }

  .page-about .about-rail__seal {
    width: 96px;
    height: 96px;
    margin-bottom: 22px;
  }

  .page-about .about-rail__seal-no {
    font-size: 26px;
  }

  .page-about .about-rail__seal-cap {
    font-size: 11px;
  }

  .page-about .about-rail__list {
    flex-direction: column;
    gap: 2px;
  }

  .page-about .about-rail__list a {
    width: 100%;
    padding: 7px 12px;
    border-radius: var(--radius-sm);
    justify-content: flex-start;
  }
}

/* ---------- 通用区块 ---------- */
.page-about .about-section + .about-section {
  margin-top: clamp(52px, 7vw, 92px);
}

.page-about .about-section .section-title {
  font-size: var(--fs-md);
  color: var(--ink-green);
  margin: 0.3em 0 0;
}

@media (min-width: 760px) {
  .page-about .about-section .section-title {
    font-size: var(--fs-lg);
  }
}

.page-about .about-section .mono-label {
  color: var(--apricot-deep);
}

.page-about .about-section__intro {
  margin: clamp(18px, 2.4vw, 26px) 0 0;
  max-width: 62ch;
  font-size: var(--fs-base);
  font-weight: 500;
  line-height: 1.6;
  color: var(--pine);
}

.page-about .about-section__lede {
  margin: clamp(22px, 3vw, 34px) 0 0;
  max-width: 72ch;
  font-size: var(--fs-base);
  line-height: 1.8;
  color: var(--slate);
}

/* ---------- 图片 ---------- */
.page-about .about-figure {
  margin: clamp(24px, 3.4vw, 38px) 0 0;
  position: relative;
  background: var(--apricot-sand);
}

.page-about .about-figure img {
  max-width: 100%;
  height: auto;
}

.page-about .about-figure__cap {
  position: absolute;
  left: 14px;
  bottom: 14px;
  padding: 5px 12px;
  border-radius: var(--radius-pill);
  background: rgba(22, 48, 42, 0.82);
  color: var(--on-ink);
  font-family: var(--font-mono);
  font-size: var(--fs-xs);
  letter-spacing: 0.06em;
}

/* ---------- 时间线 ---------- */
.page-about .timeline {
  position: relative;
  margin: clamp(28px, 4vw, 44px) 0 0;
  padding: 0 0 0 32px;
  list-style: none;
}

.page-about .timeline::before {
  content: "";
  position: absolute;
  left: 9px;
  top: 10px;
  bottom: 10px;
  width: 2px;
  border-radius: 2px;
  background: linear-gradient(180deg, var(--apricot-sand), var(--apricot) 55%, var(--route));
}

.page-about .timeline__node {
  position: relative;
  padding-bottom: clamp(22px, 3.2vw, 32px);
}

.page-about .timeline__node::before {
  content: "";
  position: absolute;
  left: -32px;
  top: 4px;
  width: 20px;
  height: 20px;
  border-radius: 50%;
  background: var(--card);
  border: 2px solid var(--apricot);
  box-shadow: 0 0 0 5px var(--paper);
}

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

.page-about .timeline__year {
  display: block;
  margin-bottom: 8px;
  color: var(--apricot-deep);
}

.page-about .timeline__card {
  padding: 18px 20px 20px;
  border-radius: var(--radius-md) var(--radius-md) var(--radius-md) 6px;
  background: var(--card);
  border: 1px solid var(--about-line);
  box-shadow: var(--shadow-card);
}

.page-about .timeline__card h3 {
  margin: 0 0 8px;
  font-size: var(--fs-base);
  font-weight: 600;
  line-height: 1.35;
  color: var(--ink-green);
}

.page-about .timeline__card p {
  margin: 0;
  max-width: 66ch;
  font-size: var(--fs-base);
  line-height: 1.72;
  color: var(--slate);
}

.page-about .timeline__plate {
  position: relative;
  padding-bottom: clamp(22px, 3.2vw, 32px);
}

.page-about .timeline__plate::before {
  content: none;
}

.page-about .timeline__plate .about-figure {
  margin-top: 0;
}

/* ---------- 分工面板 ---------- */
.page-about .crew-panel {
  position: relative;
  overflow: hidden;
  margin-top: clamp(26px, 4vw, 42px);
  padding: clamp(24px, 4vw, 48px);
  border-radius: var(--radius-lg);
  background: var(--ink-green);
  color: var(--on-ink);
  box-shadow: var(--shadow-float);
}

.page-about .crew-panel::after {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background-image: radial-gradient(circle, rgba(243, 199, 126, 0.22) 1px, transparent 1px);
  background-size: 20px 20px;
  opacity: 0.55;
}

.page-about .crew-legend {
  position: relative;
  z-index: 1;
  display: flex;
  flex-wrap: wrap;
  gap: 8px 18px;
  margin: 0 0 clamp(22px, 3vw, 32px);
  font-family: var(--font-mono);
  font-size: var(--fs-xs);
  letter-spacing: 0.07em;
  color: var(--apricot-sand);
}

.page-about .crew-flow {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: 1fr;
  gap: 14px;
  margin: 0;
  padding: 0;
  list-style: none;
}

@media (min-width: 640px) {
  .page-about .crew-flow {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (min-width: 1120px) {
  .page-about .crew-flow {
    grid-template-columns: repeat(3, 1fr);
  }
}

.page-about .crew-node {
  position: relative;
  padding: 20px 20px 20px 60px;
  min-height: 104px;
  border-radius: var(--radius-md) var(--radius-md) var(--radius-md) 5px;
  border: 1px solid rgba(243, 199, 126, 0.3);
  background: rgba(246, 239, 227, 0.08);
  transition: opacity 0.16s var(--ease), border-color 0.16s var(--ease), transform 0.16s var(--ease);
}

.page-about .crew-node:nth-child(odd) {
  border-radius: var(--radius-md) var(--radius-md) 5px var(--radius-md);
}

.page-about .crew-node__no {
  position: absolute;
  left: 18px;
  top: 20px;
  width: 28px;
  height: 28px;
  display: grid;
  place-items: center;
  border-radius: 50%;
  border: 1px dashed rgba(243, 199, 126, 0.65);
  font-family: var(--font-mono);
  font-size: var(--fs-xs);
  letter-spacing: 0.04em;
  color: var(--apricot-sand);
}

.page-about .crew-node h3 {
  margin: 0 0 7px;
  font-size: var(--fs-base);
  font-weight: 600;
  line-height: 1.35;
  color: #fff9ef;
}

.page-about .crew-node p {
  margin: 0;
  font-size: var(--fs-base);
  line-height: 1.68;
  color: rgba(230, 223, 208, 0.86);
}

@media (hover: hover) and (pointer: fine) {
  .page-about .crew-flow:hover .crew-node {
    opacity: 0.48;
  }

  .page-about .crew-flow:hover .crew-node:hover {
    opacity: 1;
    border-color: var(--apricot-sand);
    transform: translateY(-2px);
  }
}

.page-about .crew-stats {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 14px;
  margin: clamp(24px, 3.4vw, 36px) 0 0;
  padding: 0;
  list-style: none;
}

@media (min-width: 720px) {
  .page-about .crew-stats {
    grid-template-columns: repeat(4, 1fr);
  }
}

.page-about .crew-stats li {
  padding: 16px 18px;
  border-radius: var(--radius-sm);
  border: 1px solid rgba(243, 199, 126, 0.26);
  background: rgba(44, 83, 72, 0.55);
}

.page-about .crew-stats__num {
  display: block;
  font-size: var(--fs-md);
  font-weight: 500;
  line-height: 1.1;
  color: var(--apricot-sand);
}

.page-about .crew-stats__lbl {
  display: block;
  margin-top: 6px;
  font-size: var(--fs-sm);
  letter-spacing: 0.03em;
  color: rgba(230, 223, 208, 0.8);
}

/* ---------- 推荐路径 ---------- */
.page-about .paths {
  display: grid;
  grid-template-columns: 1fr;
  gap: 16px;
  margin-top: clamp(26px, 3.6vw, 38px);
}

@media (min-width: 820px) {
  .page-about .paths {
    grid-template-columns: 1.15fr 1fr 1fr;
    align-items: stretch;
  }
}

.page-about .path-card {
  position: relative;
  padding: 24px 22px 26px;
  border-radius: var(--radius-md);
  background: var(--card);
  border: 1px solid var(--about-line);
  border-top: 3px solid var(--apricot);
  box-shadow: var(--shadow-card);
}

.page-about .path-card:nth-child(2) {
  border-top-color: var(--apricot-sand);
}

.page-about .path-card:nth-child(3) {
  border-top-color: var(--pine);
}

.page-about .path-card__idx {
  display: inline-block;
  margin-bottom: 12px;
  color: var(--apricot-deep);
}

.page-about .path-card h3 {
  margin: 0 0 10px;
  font-size: var(--fs-md);
  font-weight: 500;
  line-height: 1.28;
  letter-spacing: -0.01em;
  color: var(--ink-green);
}

.page-about .path-card p {
  margin: 0;
  font-size: var(--fs-base);
  line-height: 1.72;
  color: var(--slate);
}

/* ---------- 巡检清单 ---------- */
.page-about .check-list {
  display: grid;
  grid-template-columns: 1fr;
  gap: 12px;
  margin: clamp(26px, 3.6vw, 38px) 0 0;
  padding: 0;
  list-style: none;
  counter-reset: chk;
}

@media (min-width: 820px) {
  .page-about .check-list {
    grid-template-columns: repeat(2, 1fr);
  }
}

.page-about .check-list li {
  counter-increment: chk;
  display: grid;
  grid-template-columns: 46px minmax(0, 1fr);
  gap: 12px;
  align-items: start;
  padding: 20px 22px;
  border-radius: var(--radius-md);
  background: var(--card);
  border: 1px solid var(--about-line);
  border-left: 3px solid var(--apricot-sand);
}

.page-about .check-list li::before {
  content: counter(chk, decimal-leading-zero);
  padding-top: 3px;
  font-family: var(--font-mono);
  font-size: var(--fs-sm);
  letter-spacing: 0.08em;
  color: var(--apricot-deep);
}

.page-about .check-list h3 {
  margin: 0 0 6px;
  font-size: var(--fs-base);
  font-weight: 600;
  line-height: 1.35;
  color: var(--ink-green);
}

.page-about .check-list p {
  margin: 0;
  font-size: var(--fs-base);
  line-height: 1.7;
  color: var(--slate);
}

/* ---------- 版本归档 ---------- */
.page-about .archive {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(24px, 3.6vw, 44px);
  margin-top: clamp(26px, 3.6vw, 40px);
}

@media (min-width: 900px) {
  .page-about .archive {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
    align-items: start;
  }
}

.page-about .archive .about-figure {
  margin-top: 0;
}

.page-about .archive__body p {
  margin: 0;
  max-width: 60ch;
  font-size: var(--fs-base);
  line-height: 1.78;
  color: var(--slate);
}

.page-about .version-chips {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin: 24px 0 0;
  padding: 0;
  list-style: none;
}

.page-about .version-chips li {
  width: 46px;
  height: 46px;
  display: grid;
  place-items: center;
  border-radius: 50%;
  border: 1px solid var(--route);
  background: var(--card);
  font-family: var(--font-mono);
  font-size: var(--fs-xs);
  letter-spacing: 0.06em;
  color: var(--slate);
}

.page-about .version-chips li.is-current {
  border: 2px solid var(--seal);
  background: rgba(158, 59, 46, 0.07);
  color: var(--seal);
  font-weight: 600;
}

.page-about .archive__sub {
  margin: clamp(26px, 3.4vw, 36px) 0 0;
  font-size: var(--fs-md);
  font-weight: 500;
  line-height: 1.3;
  color: var(--ink-green);
}

.page-about .seal-checks {
  margin: 16px 0 0;
  padding: 0 0 0 20px;
  list-style: none;
}

.page-about .seal-checks li {
  position: relative;
  padding: 6px 0 6px 0;
  font-size: var(--fs-base);
  line-height: 1.7;
  color: var(--slate);
  border-bottom: 1px solid var(--about-line);
}

.page-about .seal-checks li:last-child {
  border-bottom: 0;
}

.page-about .seal-checks li::before {
  content: "";
  position: absolute;
  left: -18px;
  top: 17px;
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--apricot);
}

.page-about .archive__body .btn-row {
  margin-top: clamp(22px, 3vw, 30px);
}

/* ---------- 收尾 ---------- */
.page-about .about-cta {
  margin-top: clamp(52px, 7vw, 92px);
  padding: clamp(26px, 4vw, 46px);
  border-radius: var(--radius-lg);
  background: linear-gradient(135deg, var(--apricot-sand) 0%, #f7dcb4 48%, var(--card) 100%);
  border: 1px solid rgba(168, 90, 22, 0.22);
}

.page-about .about-cta .section-title {
  margin: 0;
  font-size: var(--fs-md);
  color: var(--ink-green);
}

@media (min-width: 760px) {
  .page-about .about-cta .section-title {
    font-size: var(--fs-lg);
  }
}

.page-about .about-cta p {
  margin: 14px 0 0;
  max-width: 56ch;
  font-size: var(--fs-base);
  line-height: 1.72;
  color: var(--pine);
}

.page-about .about-cta .btn-row {
  margin-top: clamp(20px, 2.6vw, 28px);
}

.page-about .about-cta__back {
  margin-top: 18px;
  font-size: var(--fs-sm);
}

.page-about .about-cta__back a {
  color: var(--apricot-deep);
  text-decoration: underline;
  text-underline-offset: 3px;
}

.page-about .about-cta__back a:hover,
.page-about .about-cta__back a:focus-visible {
  color: var(--ink-green);
}

/* ---------- 减少动效 ---------- */
@media (prefers-reduced-motion: reduce) {
  .page-about .crew-node,
  .page-about .about-rail__list a {
    transition: none;
  }

  .page-about .crew-flow:hover .crew-node,
  .page-about .crew-flow:hover .crew-node:hover {
    opacity: 1;
    transform: none;
  }
}
<<<END>>>