.page-about {
  --about-side: 216px;
  --about-panel: rgba(11, 61, 46, .55);
  background: var(--warm);
  color: var(--ink);
  overflow-x: hidden;
}

/* ---------- 面包屑 ---------- */
.page-about .about-crumb-wrap {
  padding-top: 26px;
  padding-bottom: 6px;
}

.page-about .breadcrumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .08em;
  color: var(--sage);
}

.page-about .breadcrumb a {
  color: var(--sage);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color .25s var(--ease), border-color .25s var(--ease);
}

.page-about .breadcrumb a:hover {
  color: var(--gold);
  border-bottom-color: var(--gold);
}

.page-about .breadcrumb [aria-current="page"] {
  color: var(--gold);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  overflow: hidden;
  color: var(--warm);
  background: linear-gradient(158deg, var(--emerald) 0%, var(--emerald-3) 52%, var(--emerald-2) 100%);
  border-bottom: 1px solid var(--hairline);
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background-image:
    linear-gradient(to right, var(--hairline-soft) 1px, transparent 1px),
    linear-gradient(to bottom, var(--hairline-soft) 1px, transparent 1px);
  background-size: 72px 72px;
  opacity: .55;
}

.page-about .about-hero__grid {
  position: relative;
  z-index: 1;
  display: grid;
  gap: clamp(26px, 5vw, 52px);
  padding-block: clamp(48px, 8vw, 104px);
  align-items: center;
}

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

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

.page-about .about-hero h1 {
  margin: 0;
  font-family: var(--font-head);
  font-size: clamp(32px, 5.6vw, 62px);
  font-weight: 700;
  line-height: 1.1;
  letter-spacing: -.015em;
  color: var(--warm);
}

.page-about .about-hero .lead {
  margin: 0;
  max-width: 56ch;
  font-size: clamp(15px, 1.5vw, 17px);
  line-height: 1.95;
  color: rgba(247, 243, 234, .82);
}

.page-about .about-hero__facts {
  list-style: none;
  margin: 6px 0 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.page-about .about-hero__facts li {
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: .08em;
  padding: 7px 13px;
  color: var(--gold-bright);
  border: 1px solid var(--hairline);
  background: rgba(217, 178, 106, .06);
}

.page-about .about-hero__figure {
  margin: 0;
  border: 1px solid var(--gold-line);
  background: var(--emerald-2);
  min-width: 0;
}

.page-about .about-hero__figure img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 2 / 1;
  object-fit: cover;
}

.page-about .about-hero__figure figcaption {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .16em;
  text-transform: uppercase;
  color: var(--gold);
  padding: 11px 14px;
  border-top: 1px solid var(--hairline);
  background: rgba(17, 22, 20, .35);
}

/* ---------- 主体骨架 ---------- */
.page-about .about-shell {
  display: grid;
  gap: clamp(26px, 4vw, 56px);
  padding-block: clamp(48px, 7vw, 104px);
}

.page-about .about-toc__label {
  margin: 0 0 12px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .2em;
  text-transform: uppercase;
  color: var(--sage);
}

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

.page-about .about-toc__list a {
  display: block;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .06em;
  color: var(--sage);
  text-decoration: none;
  padding: 8px 12px;
  border: 1px solid var(--hairline-soft);
  background: rgba(247, 243, 234, .6);
  transition: color .25s var(--ease), border-color .25s var(--ease), background .25s var(--ease);
}

.page-about .about-toc__list a:hover {
  color: var(--emerald);
  border-color: var(--gold);
}

.page-about .about-toc__list a[aria-current="location"] {
  color: var(--ink);
  border-color: var(--gold);
  background: rgba(217, 178, 106, .2);
}

.page-about .about-flow {
  display: grid;
  gap: clamp(48px, 6vw, 92px);
  min-width: 0;
}

/* ---------- 章节 ---------- */
.page-about .chapter {
  display: grid;
  gap: 20px;
  min-width: 0;
}

.page-about .chapter__head {
  display: grid;
  gap: 10px;
  padding-top: 18px;
  border-top: 2px solid var(--emerald);
}

.page-about .chapter__index {
  margin: 0;
  font-size: 13px;
  letter-spacing: .28em;
  color: var(--gold);
}

.page-about .chapter h2 {
  margin: 0;
  font-family: var(--font-head);
  font-size: clamp(24px, 3.4vw, 38px);
  font-weight: 700;
  line-height: 1.22;
  letter-spacing: -.01em;
  color: var(--emerald);
}

.page-about .chapter__lead {
  margin: 0;
  max-width: 62ch;
  font-size: 15.5px;
  line-height: 1.9;
  color: var(--sage);
}

.page-about .chapter__body {
  display: grid;
  gap: 16px;
  max-width: 68ch;
}

.page-about .chapter__body p {
  margin: 0;
  font-size: 16px;
  line-height: 2;
  color: var(--ink);
}

.page-about .chapter__body a {
  color: var(--emerald);
  text-decoration: none;
  border-bottom: 1px solid var(--gold);
  transition: color .25s var(--ease), border-color .25s var(--ease);
}

.page-about .chapter__body a:hover {
  color: var(--gold);
  border-bottom-color: var(--emerald);
}

.page-about .chapter__tail {
  margin: 0;
  max-width: 68ch;
  font-size: 15px;
  line-height: 1.95;
  color: var(--sage);
  border-left: 2px solid var(--gold);
  padding-left: 16px;
}

.page-about .chapter__tail a {
  color: var(--emerald);
  text-decoration: none;
  border-bottom: 1px solid var(--gold-line);
}

.page-about .chapter__tail a:hover {
  color: var(--gold);
}

.page-about .chapter__points {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 0;
  border-top: 1px solid var(--hairline-soft);
}

.page-about .chapter__points li {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  align-items: baseline;
  padding: 14px 4px;
  border-bottom: 1px solid var(--hairline-soft);
  font-size: 14.5px;
  line-height: 1.8;
  color: var(--ink);
  transition: background .25s var(--ease), padding-left .25s var(--ease);
}

.page-about .chapter__points li:hover {
  background: rgba(217, 178, 106, .09);
  padding-left: 12px;
}

.page-about .chapter__points .mono {
  min-width: 84px;
  font-size: 12px;
  letter-spacing: .1em;
  color: var(--gold);
}

.page-about .chapter__figure {
  margin: 4px 0 0;
  border: 1px solid var(--hairline);
  background: var(--emerald-2);
  min-width: 0;
}

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

.page-about .chapter__figure figcaption {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .14em;
  color: var(--gold);
  padding: 11px 14px;
  border-top: 1px solid var(--hairline);
  background: rgba(17, 22, 20, .35);
}

/* ---------- 时间线 ---------- */
.page-about .timeline-nav {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.page-about .timeline-nav__chip {
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: .1em;
  padding: 7px 12px;
  color: var(--gold-bright);
  background: var(--emerald);
  border: 1px solid var(--hairline);
  text-decoration: none;
  transition: background .25s var(--ease), color .25s var(--ease);
}

.page-about .timeline-nav__chip:hover {
  background: var(--gold);
  color: var(--ink);
}

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

.page-about .timeline__item {
  position: relative;
  padding: 0 0 30px 30px;
}

.page-about .timeline__item::before {
  content: "";
  position: absolute;
  left: 3px;
  top: 8px;
  bottom: 0;
  width: 1px;
  background: var(--hairline);
}

.page-about .timeline__item::after {
  content: "";
  position: absolute;
  left: 0;
  top: 8px;
  width: 7px;
  height: 7px;
  background: var(--gold);
}

.page-about .timeline__item:last-child {
  padding-bottom: 4px;
}

.page-about .timeline__item:last-child::before {
  display: none;
}

.page-about .timeline__year {
  display: block;
  font-family: var(--font-mono);
  font-size: 12.5px;
  letter-spacing: .16em;
  color: var(--gold);
  margin-bottom: 6px;
}

.page-about .timeline__item h3 {
  margin: 0 0 7px;
  font-family: var(--font-head);
  font-size: clamp(17px, 2vw, 20px);
  font-weight: 600;
  line-height: 1.4;
  color: var(--emerald);
}

.page-about .timeline__item p {
  margin: 0;
  max-width: 62ch;
  font-size: 14.5px;
  line-height: 1.9;
  color: var(--sage);
}

/* ---------- 栏目体系结构 ---------- */
.page-about .blueprint {
  display: grid;
  gap: 20px;
  padding: clamp(20px, 3vw, 34px);
  background: var(--emerald);
  border: 1px solid var(--gold-line);
  color: var(--warm);
}

.page-about .blueprint__root {
  margin: 0;
  text-align: center;
  font-size: 12.5px;
  letter-spacing: .12em;
  padding: 13px 16px;
  color: var(--gold-bright);
  border: 1px solid var(--gold-line);
  background: rgba(217, 178, 106, .09);
}

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

.page-about .blueprint__col {
  padding: 18px;
  background: var(--about-panel, rgba(11, 61, 46, .55));
  border: 1px solid var(--hairline-soft);
  border-top: 2px solid var(--gold);
  transition: background .3s var(--ease), border-color .3s var(--ease);
}

.page-about .blueprint__col:hover,
.page-about .blueprint__col:focus-within {
  background: rgba(20, 85, 63, .85);
  border-color: var(--gold);
}

.page-about .blueprint__col h3 {
  margin: 0 0 10px;
  font-family: var(--font-head);
  font-size: 19px;
  font-weight: 600;
  color: var(--gold-bright);
}

.page-about .blueprint__note {
  margin: 0;
  font-size: 14px;
  line-height: 1.85;
  color: rgba(247, 243, 234, .82);
}

.page-about .blueprint__meta {
  margin: 14px 0 0;
  display: grid;
  gap: 0;
  border-top: 1px solid var(--hairline-soft);
}

.page-about .blueprint__meta > div {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  justify-content: space-between;
  padding: 8px 0;
  border-bottom: 1px solid var(--hairline-soft);
}

.page-about .blueprint__meta dt {
  font-size: 12.5px;
  color: rgba(247, 243, 234, .6);
  letter-spacing: .05em;
}

.page-about .blueprint__meta dd {
  margin: 0;
  font-size: 12.5px;
  color: var(--gold);
  letter-spacing: .06em;
}

.page-about .blueprint__detail {
  margin: 14px 0 0;
  font-size: 13.5px;
  line-height: 1.85;
  color: rgba(247, 243, 234, .72);
  border-left: 1px solid var(--gold-line);
  padding-left: 12px;
}

.page-about .blueprint__dims {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--hairline-soft);
  border: 1px solid var(--hairline-soft);
}

.page-about .blueprint__dims li {
  display: flex;
  gap: 10px;
  align-items: baseline;
  padding: 12px 14px;
  background: var(--emerald-2);
  font-size: 14px;
  color: var(--warm);
}

.page-about .blueprint__dims .mono {
  font-size: 11px;
  letter-spacing: .16em;
  color: var(--cyan);
}

/* ---------- 团队角色 ---------- */
.page-about .roles {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 0;
  border-top: 1px solid var(--hairline);
}

.page-about .roles__item {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 18px;
  padding: 22px 4px;
  border-bottom: 1px solid var(--hairline-soft);
  transition: background .3s var(--ease), padding-left .3s var(--ease);
}

.page-about .roles__item:hover {
  background: rgba(217, 178, 106, .1);
  padding-left: 14px;
}

.page-about .roles__num {
  font-size: clamp(20px, 2.4vw, 28px);
  font-weight: 700;
  line-height: 1;
  color: var(--gold);
  letter-spacing: -.02em;
}

.page-about .roles__body h3 {
  margin: 0 0 8px;
  font-family: var(--font-head);
  font-size: 18px;
  font-weight: 600;
  color: var(--emerald);
}

.page-about .roles__body p {
  margin: 0;
  max-width: 64ch;
  font-size: 14.5px;
  line-height: 1.9;
  color: var(--sage);
}

/* ---------- 规模数字 ---------- */
.page-about .scale-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 10px;
}

.page-about .scale-item {
  display: grid;
  gap: 8px;
  align-content: start;
  padding: 20px 16px;
  background: var(--warm);
  border: 1px solid var(--hairline-soft);
  border-top: 2px solid var(--emerald);
  transition: border-color .3s var(--ease), background .3s var(--ease);
}

.page-about .scale-item:hover {
  background: rgba(217, 178, 106, .12);
  border-top-color: var(--gold);
}

.page-about .scale-item__num {
  font-family: var(--font-mono);
  font-size: clamp(28px, 4.6vw, 44px);
  font-weight: 700;
  line-height: 1;
  letter-spacing: -.02em;
  color: var(--emerald);
}

.page-about .scale-item__label {
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: .12em;
  color: var(--sage);
}

/* ---------- 折叠问答 ---------- */
.page-about .fold {
  border: 1px solid var(--hairline-soft);
  border-left: 2px solid var(--gold);
  background: rgba(247, 243, 234, .7);
}

.page-about .fold + .fold {
  margin-top: 10px;
}

.page-about .fold summary {
  cursor: pointer;
  padding: 15px 18px;
  font-family: var(--font-head);
  font-size: 15.5px;
  font-weight: 600;
  color: var(--emerald);
  list-style: none;
  transition: color .25s var(--ease), background .25s var(--ease);
}

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

.page-about .fold summary::before {
  content: "+";
  display: inline-block;
  width: 18px;
  font-family: var(--font-mono);
  color: var(--gold);
}

.page-about .fold[open] summary::before {
  content: "−";
}

.page-about .fold summary:hover {
  background: rgba(217, 178, 106, .13);
}

.page-about .fold__body {
  padding: 0 18px 18px 36px;
  font-size: 14.5px;
  line-height: 1.95;
  color: var(--sage);
}

.page-about .fold__body p {
  margin: 0;
  max-width: 64ch;
}

/* ---------- 尾部行动区 ---------- */
.page-about .about-cta {
  position: relative;
  overflow: hidden;
  background: linear-gradient(120deg, var(--ink) 0%, var(--emerald) 100%);
  border-top: 1px solid var(--gold-line);
  color: var(--warm);
}

.page-about .about-cta::after {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background-image: linear-gradient(to right, var(--hairline-soft) 1px, transparent 1px);
  background-size: 96px 100%;
  opacity: .5;
}

.page-about .about-cta__inner {
  position: relative;
  z-index: 1;
  display: grid;
  gap: 26px;
  padding-block: clamp(44px, 6vw, 84px);
}

.page-about .about-cta__text {
  display: grid;
  gap: 12px;
}

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

.page-about .about-cta h2 {
  margin: 0;
  font-family: var(--font-head);
  font-size: clamp(22px, 3.2vw, 34px);
  font-weight: 700;
  line-height: 1.25;
  color: var(--warm);
}

.page-about .about-cta__text p {
  margin: 0;
  max-width: 58ch;
  font-size: 15px;
  line-height: 1.9;
  color: rgba(247, 243, 234, .78);
}

.page-about .about-cta__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

/* ---------- 响应式 ---------- */
@media (min-width: 620px) {
  .page-about .scale-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

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

@media (min-width: 860px) {
  .page-about .about-hero__grid {
    grid-template-columns: 1.05fr 1fr;
  }

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

  .page-about .about-cta__inner {
    grid-template-columns: minmax(0, 1.2fr) auto;
    align-items: center;
    gap: 40px;
  }
}

@media (min-width: 1000px) {
  .page-about .about-shell {
    grid-template-columns: var(--about-side) minmax(0, 1fr);
    align-items: start;
  }

  .page-about .about-toc {
    position: sticky;
    top: 118px;
  }

  .page-about .about-toc__list {
    flex-direction: column;
    flex-wrap: nowrap;
    gap: 0;
  }

  .page-about .about-toc__list a {
    border: 0;
    border-left: 2px solid var(--hairline-soft);
    background: transparent;
    padding: 10px 12px;
  }

  .page-about .about-toc__list a[aria-current="location"] {
    border-left-color: var(--gold);
    background: rgba(217, 178, 106, .12);
  }

  .page-about .scale-grid {
    grid-template-columns: repeat(6, minmax(0, 1fr));
  }
}

@media (min-width: 1240px) {
  .page-about {
    --about-side: 246px;
  }

  .page-about .about-hero__grid {
    gap: 72px;
  }
}

@media (hover: hover) and (min-width: 860px) {
  .page-about .blueprint__detail {
    max-height: 0;
    opacity: 0;
    overflow: hidden;
    margin-top: 0;
    padding-left: 0;
    border-left-color: transparent;
    transition: max-height .4s var(--ease), opacity .32s var(--ease),
      margin-top .32s var(--ease), padding-left .32s var(--ease),
      border-left-color .32s var(--ease);
  }

  .page-about .blueprint__col:hover .blueprint__detail,
  .page-about .blueprint__col:focus-within .blueprint__detail {
    max-height: 260px;
    opacity: 1;
    margin-top: 14px;
    padding-left: 12px;
    border-left-color: var(--gold-line);
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about * {
    transition-duration: .01ms !important;
    animation-duration: .01ms !important;
  }

  .page-about .blueprint__detail {
    max-height: none !important;
    opacity: 1 !important;
    margin-top: 14px !important;
    padding-left: 12px !important;
  }
}
<<<END>>>