.page-about {
  --about-rail-w: 236px;
  background: var(--paper);
  color: var(--ink);
}

.page-about [id] {
  scroll-margin-top: calc(var(--header-h) + 20px);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  isolation: isolate;
  overflow: hidden;
  background:
    radial-gradient(110% 130% at 86% 8%, rgba(194, 94, 39, .58), rgba(194, 94, 39, 0) 58%),
    linear-gradient(158deg, var(--pine) 0%, var(--pine-soft) 52%, var(--anchor-deep) 100%);
  color: var(--paper);
  padding: clamp(22px, 4vw, 40px) 0 clamp(34px, 6vw, 66px);
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  right: -12%;
  bottom: -42%;
  width: min(560px, 72vw);
  aspect-ratio: 1;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(232, 201, 155, .18), rgba(232, 201, 155, 0) 68%);
  z-index: -1;
}

.page-about .about-hero .breadcrumbs__link,
.page-about .about-hero .breadcrumbs__current,
.page-about .about-hero .breadcrumbs__sep {
  color: var(--loess);
}

.page-about .about-hero .eyebrow {
  color: var(--loess);
}

.page-about .about-hero__grid {
  display: grid;
  gap: clamp(24px, 4vw, 44px);
  margin-top: clamp(20px, 3vw, 34px);
  align-items: end;
}

.page-about .about-hero__title {
  font-family: var(--font-display);
  font-weight: 300;
  font-size: clamp(34px, 6.2vw, 72px);
  line-height: 1.06;
  letter-spacing: -.02em;
  color: var(--white);
  margin: 12px 0 0;
  max-width: 20ch;
}

.page-about .about-hero__lead {
  font-family: var(--font-body);
  font-size: clamp(16px, 1.1vw, 18px);
  line-height: 1.82;
  color: rgba(246, 241, 231, .84);
  max-width: 58ch;
  margin: 18px 0 0;
}

.page-about .about-hero__visual {
  display: flex;
  flex-direction: column;
  gap: 5px;
  border-left: 2px solid var(--copper);
  padding-left: clamp(14px, 2vw, 24px);
}

.page-about .about-hero__version {
  font-family: var(--font-mono);
  font-weight: 800;
  font-size: clamp(62px, 12vw, 146px);
  line-height: .84;
  letter-spacing: -.03em;
  color: var(--loess);
  display: block;
}

.page-about .about-hero__version-label {
  font-family: var(--font-ui);
  font-size: 13px;
  letter-spacing: .14em;
  color: var(--loess);
}

.page-about .about-hero__version-note {
  font-family: var(--font-ui);
  font-size: 12px;
  letter-spacing: .1em;
  color: rgba(246, 241, 231, .62);
}

.page-about .hero-index {
  display: flex;
  flex-wrap: wrap;
  gap: 10px 26px;
  margin-top: clamp(28px, 4vw, 46px);
  padding-top: 16px;
  border-top: 1px solid rgba(184, 134, 63, .45);
}

.page-about .hero-index a {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .1em;
  color: var(--paper-2);
  text-decoration: none;
  padding-bottom: 3px;
  border-bottom: 1px solid transparent;
  transition: color .2s ease, border-color .2s ease;
}

.page-about .hero-index a:hover,
.page-about .hero-index a:focus-visible {
  color: var(--flare);
  border-bottom-color: var(--flare);
}

/* ---------- 左轨 + 叙事流 ---------- */
.page-about .about-body {
  display: grid;
  gap: clamp(26px, 4vw, 52px);
  padding: clamp(40px, 6vw, 80px) 0 clamp(28px, 5vw, 56px);
}

.page-about .about-rail__inner {
  border-left: 1px solid var(--copper-line);
  padding-left: 20px;
}

.page-about .about-rail__title {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .16em;
  color: var(--bronze);
  margin: 0 0 14px;
}

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

.page-about .about-rail__link {
  position: relative;
  display: block;
  padding: 12px 0;
  text-decoration: none;
  color: var(--ink);
  border-bottom: 1px dashed rgba(184, 134, 63, .35);
}

.page-about .about-rail__link::before {
  content: "";
  position: absolute;
  left: -25px;
  top: 20px;
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--clay);
  box-shadow: 0 0 0 4px var(--paper);
  transition: transform .24s ease, background .24s ease;
}

.page-about .about-rail__link:hover::before,
.page-about .about-rail__link:focus-visible::before {
  transform: translateY(2px);
  background: var(--flare);
}

.page-about .about-rail__link:hover .about-rail__label,
.page-about .about-rail__link:focus-visible .about-rail__label {
  color: var(--anchor);
}

.page-about .about-rail__label {
  display: block;
  font-family: var(--font-ui);
  font-size: 14px;
  font-weight: 700;
  transition: color .24s ease;
}

.page-about .about-rail__ver {
  display: block;
  margin-top: 3px;
  font-size: 12px;
  letter-spacing: .08em;
  color: var(--bronze);
}

.page-about .about-rail__foot {
  margin: 18px 0 0;
  font-family: var(--font-body);
  font-size: 14px;
  line-height: 1.7;
  color: var(--bronze);
}

/* ---------- 章节通用 ---------- */
.page-about .about-stream {
  min-width: 0;
}

.page-about .about-section {
  padding: clamp(26px, 4vw, 46px) 0;
  border-top: 1px solid var(--copper-line);
}

.page-about .about-section:first-child {
  border-top: 0;
  padding-top: 0;
}

.page-about .about-section__title {
  font-family: var(--font-display);
  font-weight: 600;
  font-size: clamp(24px, 3.4vw, 40px);
  line-height: 1.2;
  letter-spacing: -.01em;
  color: var(--pine);
  margin: 10px 0 0;
  max-width: 26ch;
}

.page-about .about-section__lead {
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.82;
  color: var(--bronze);
  max-width: 62ch;
  margin: 12px 0 0;
}

.page-about .about-section__body {
  margin-top: clamp(16px, 2vw, 24px);
}

.page-about .about-section__body p {
  font-family: var(--font-body);
  font-size: 16.5px;
  line-height: 1.85;
  color: var(--ink);
  margin: 0 0 16px;
  max-width: 64ch;
}

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

.page-about .about-split {
  display: grid;
  gap: clamp(20px, 3vw, 34px);
  margin-top: clamp(16px, 2vw, 24px);
}

.page-about .about-link {
  display: inline-block;
  font-family: var(--font-ui);
  font-size: 14px;
  font-weight: 700;
  letter-spacing: .06em;
  color: var(--anchor);
  text-decoration: none;
  padding-bottom: 3px;
  border-bottom: 2px solid var(--copper);
  transition: color .2s ease, border-color .2s ease;
}

.page-about .about-link:hover,
.page-about .about-link:focus-visible {
  color: var(--flare);
  border-bottom-color: var(--flare);
}

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

.page-about .about-figure img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
  border-radius: var(--radius);
  background: var(--paper-2);
}

.page-about .about-figure figcaption {
  margin-top: 10px;
  font-family: var(--font-ui);
  font-size: 12px;
  letter-spacing: .08em;
  line-height: 1.7;
  color: var(--bronze);
}

.page-about .about-figure--wide {
  margin: clamp(20px, 3vw, 30px) 0;
}

.page-about .about-figure--full {
  margin: 0 0 clamp(18px, 3vw, 28px);
}

/* ---------- 版本阶段 ---------- */
.page-about .stage {
  position: relative;
  margin: clamp(18px, 2.5vw, 26px) 0;
  padding: clamp(16px, 2.4vw, 26px) clamp(16px, 2.6vw, 30px);
  background: var(--white);
  border-left: 3px solid var(--clay);
  box-shadow: var(--shadow-soft);
}

.page-about .stage--pine {
  border-left-color: var(--pine);
}

.page-about .stage .stage__range {
  font-family: var(--font-mono);
  font-weight: 800;
  font-size: clamp(26px, 4vw, 46px);
  line-height: 1;
  letter-spacing: .01em;
  color: var(--clay);
  margin: 0;
}

.page-about .stage--pine .stage__range {
  color: var(--pine);
}

.page-about .stage__title {
  font-family: var(--font-ui);
  font-weight: 700;
  font-size: clamp(17px, 1.6vw, 21px);
  line-height: 1.42;
  color: var(--ink);
  margin: 10px 0 8px;
}

.page-about .stage p {
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.82;
  color: var(--ink);
  margin: 0;
  max-width: 62ch;
}

/* ---------- 团队数字 ---------- */
.page-about .team-stats {
  display: grid;
  gap: 14px;
  margin-top: clamp(20px, 3vw, 30px);
}

.page-about .team-stat {
  background: var(--paper-2);
  border-top: 3px solid var(--clay);
  padding: 18px 20px 20px;
}

.page-about .team-stat .stat__num {
  display: block;
  font-family: var(--font-mono);
  font-weight: 800;
  font-size: clamp(30px, 4.4vw, 44px);
  line-height: 1;
  letter-spacing: -.01em;
  color: var(--pine);
}

.page-about .team-stat .stat__label {
  display: block;
  margin-top: 8px;
  font-family: var(--font-ui);
  font-size: 13px;
  line-height: 1.6;
  letter-spacing: .04em;
  color: var(--bronze);
}

/* ---------- 行业分段切换 ---------- */
.page-about .tabs {
  margin-top: clamp(18px, 3vw, 28px);
}

.page-about .tabs__list {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--copper-line);
}

.page-about .tabs__tab {
  min-height: 44px;
  padding: 10px 18px;
  border: 1px solid var(--copper-line);
  border-radius: var(--radius);
  background: var(--white);
  color: var(--ink);
  font-family: var(--font-ui);
  font-size: 14px;
  font-weight: 700;
  letter-spacing: .04em;
  cursor: pointer;
  transition: background .24s ease, color .24s ease, border-color .24s ease;
}

.page-about .tabs__tab[aria-selected="true"] {
  background: var(--pine);
  border-color: var(--pine);
  color: var(--paper);
}

.page-about .tabs__tab:hover,
.page-about .tabs__tab:focus-visible {
  border-color: var(--anchor);
  color: var(--anchor);
}

.page-about .tabs__tab[aria-selected="true"]:hover,
.page-about .tabs__tab[aria-selected="true"]:focus-visible {
  color: var(--paper);
}

.page-about .tabs__panel {
  padding-top: clamp(16px, 2.4vw, 24px);
}

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

.page-about .scene-list li {
  background: var(--white);
  border: 1px solid var(--copper-line);
  border-left: 3px solid var(--clay);
  padding: 16px 18px;
  font-family: var(--font-ui);
  font-size: 14.5px;
  line-height: 1.72;
  color: var(--ink);
}

/* ---------- 收束 ---------- */
.page-about .about-cta {
  margin: clamp(28px, 4vw, 46px) 0 clamp(24px, 4vw, 46px);
  padding: clamp(26px, 4vw, 48px);
  border-radius: var(--radius);
  background: linear-gradient(140deg, var(--pine) 0%, var(--anchor-deep) 100%);
  color: var(--paper);
}

.page-about .about-cta .eyebrow {
  color: var(--loess);
}

.page-about .about-cta h2 {
  font-family: var(--font-display);
  font-weight: 300;
  font-size: clamp(24px, 3.6vw, 42px);
  line-height: 1.16;
  letter-spacing: -.01em;
  color: var(--white);
  margin: 10px 0 12px;
  max-width: 24ch;
}

.page-about .about-cta p {
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.82;
  color: rgba(246, 241, 231, .82);
  max-width: 62ch;
  margin: 0;
}

.page-about .about-cta__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: clamp(20px, 3vw, 28px);
}

/* ---------- 窄屏 ---------- */
@media (max-width: 899px) {
  .page-about .about-rail__inner {
    border-left: 0;
    padding-left: 0;
    border-top: 1px solid var(--copper-line);
    padding-top: 18px;
  }

  .page-about .about-rail__link::before {
    display: none;
  }

  .page-about .about-rail__link {
    padding-left: 14px;
    border-left: 2px solid var(--clay);
  }
}

@media (max-width: 640px) {
  .page-about .about-hero__visual {
    border-left: 0;
    padding-left: 0;
    border-top: 1px solid rgba(184, 134, 63, .5);
    padding-top: 16px;
  }

  .page-about .about-cta__actions .btn {
    width: 100%;
    text-align: center;
  }
}

@media (min-width: 780px) {
  .page-about .scene-list {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

@media (min-width: 700px) {
  .page-about .team-stats {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

@media (min-width: 820px) {
  .page-about .about-split {
    grid-template-columns: minmax(0, 1.1fr) minmax(0, .9fr);
    align-items: start;
  }
}

@media (min-width: 900px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 1.25fr) minmax(220px, .75fr);
  }

  .page-about .about-body {
    grid-template-columns: var(--about-rail-w) minmax(0, 1fr);
    align-items: start;
  }

  .page-about .about-rail__inner {
    position: sticky;
    top: calc(var(--header-h) + 28px);
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-rail__link::before,
  .page-about .about-rail__label,
  .page-about .hero-index a,
  .page-about .about-link,
  .page-about .tabs__tab {
    transition: none;
  }
}
<<<END>>>