.page-about {
  --about-line: rgba(181, 136, 90, .24);
  --about-line-strong: rgba(181, 136, 90, .55);
  --about-gutter: 48px;
  --about-rail: 216px;
  background: var(--ivory);
  color: var(--ink);
}

/* ---------- 首屏 ---------- */

.page-about .about-hero {
  position: relative;
  background:
    radial-gradient(120% 90% at 82% 8%, rgba(217, 166, 75, .10), transparent 58%),
    linear-gradient(180deg, var(--ink-green) 0%, var(--green-panel) 100%);
  color: var(--ivory);
  padding: 32px 0 0;
  border-bottom: 1px solid var(--about-line);
  overflow: hidden;
}

.page-about .about-hero__crumbs ol {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  list-style: none;
  margin: 0 0 40px;
  padding: 0;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .06em;
}

.page-about .about-hero__crumbs li {
  color: var(--steel);
}

.page-about .about-hero__crumbs li + li::before {
  content: "/";
  margin-right: 8px;
  color: var(--wood-light);
}

.page-about .about-hero__crumbs a {
  color: var(--steel);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color .2s var(--ease), border-color .2s var(--ease);
}

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

.page-about .about-hero__eyebrow {
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: .1em;
  color: var(--amber);
  margin: 0 0 20px;
}

.page-about .about-hero__title {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 40px;
  line-height: 1.22;
  letter-spacing: .01em;
  margin: 0 0 36px;
  max-width: 15em;
  color: var(--ivory);
}

.page-about .about-hero__grid {
  display: grid;
  gap: 32px;
  padding-bottom: 40px;
}

.page-about .about-hero__lede {
  font-size: 16px;
  line-height: 1.85;
  color: rgba(241, 235, 223, .84);
  margin: 0;
  max-width: 46em;
  border-left: 2px solid var(--amber);
  padding-left: 20px;
}

.page-about .about-hero__facts {
  display: flex;
  flex-wrap: wrap;
  gap: 0;
  margin: 0;
  border-top: 1px solid var(--about-line);
  border-bottom: 1px solid var(--about-line);
}

.page-about .about-hero__fact {
  flex: 1 1 140px;
  padding: 18px 20px 18px 0;
  border-right: 1px solid var(--about-line);
}

.page-about .about-hero__fact:last-child {
  border-right: 0;
}

.page-about .about-hero__fact dt {
  font-size: 12px;
  letter-spacing: .08em;
  color: var(--steel);
  margin-bottom: 6px;
}

.page-about .about-hero__fact dd {
  margin: 0;
  font-size: 19px;
  color: var(--ivory);
}

.page-about .about-hero__fact .mono {
  color: var(--amber);
  font-family: var(--font-mono);
  letter-spacing: .06em;
}

.page-about .about-hero__media {
  margin: 0 -24px;
  position: relative;
}

.page-about .about-hero__media img {
  display: block;
  width: 100%;
  height: auto;
  max-width: 100%;
  object-fit: cover;
  aspect-ratio: 3 / 2;
  filter: saturate(.86) brightness(.86);
}

/* ---------- 主体骨架 ---------- */

.page-about .about-body {
  padding-top: 0;
  padding-bottom: 72px;
}

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

.page-about .about-rail {
  padding: 32px 0 8px;
  border-bottom: 1px solid var(--rule);
}

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

/* ---------- 左侧索引 ---------- */

.page-about .about-index .index-nav__title {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .1em;
  color: var(--steel-deep);
  margin: 0 0 12px;
}

.page-about .about-index .index-nav__list {
  display: flex;
  flex-wrap: wrap;
  gap: 6px 18px;
  list-style: none;
  margin: 0;
  padding: 0;
}

.page-about .about-index .index-nav__link {
  display: inline-flex;
  align-items: baseline;
  gap: 8px;
  font-size: 13px;
  color: var(--ink-soft);
  text-decoration: none;
  padding: 6px 0;
  border-bottom: 1px solid transparent;
  transition: color .2s var(--ease), border-color .2s var(--ease);
}

.page-about .about-index .index-nav__link .mono {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .06em;
  color: var(--wood-light);
}

.page-about .about-index .index-nav__link:hover {
  color: var(--wood);
  border-bottom-color: var(--wood-light);
}

.page-about .about-index .index-nav__link[aria-current="true"] {
  color: var(--ink);
  font-weight: 500;
  border-bottom-color: var(--amber);
}

.page-about .about-index .index-nav__link[aria-current="true"] .mono {
  color: var(--amber-deep);
}

/* ---------- 章节 ---------- */

.page-about .about-section {
  padding: 48px 0 56px;
  border-bottom: 1px solid var(--rule);
}

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

.page-about .about-section__no {
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: .12em;
  color: var(--wood-light);
  margin: 0 0 10px;
  display: flex;
  align-items: center;
  gap: 12px;
}

.page-about .about-section__no::after {
  content: "";
  flex: 0 0 40px;
  height: 1px;
  background: var(--wood-light);
  opacity: .6;
}

.page-about .about-section__title {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 26px;
  line-height: 1.35;
  letter-spacing: .01em;
  color: var(--ink);
  margin: 0 0 22px;
}

.page-about .about-section .prose p {
  font-size: 15px;
  line-height: 1.85;
  color: var(--ink-soft);
  margin: 0 0 16px;
  max-width: 42em;
}

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

/* ---------- 数字块 ---------- */

.page-about .about-stats {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1px;
  background: var(--rule);
  border: 1px solid var(--rule);
  margin-top: 32px;
}

.page-about .about-stat {
  background: var(--paper);
  padding: 22px 20px 24px;
  transition: background .25s var(--ease), box-shadow .25s var(--ease);
}

.page-about .about-stat:hover {
  background: #ffffff;
  box-shadow: inset 0 0 0 1px var(--wood-light);
}

.page-about .about-stat__num {
  font-family: var(--font-mono);
  font-size: 38px;
  line-height: 1;
  letter-spacing: .02em;
  color: var(--amber-deep);
  margin: 0 0 12px;
}

.page-about .about-stat__unit {
  font-size: 20px;
  margin-left: 2px;
}

.page-about .about-stat__label {
  font-size: 14px;
  font-weight: 500;
  color: var(--ink);
  margin: 0 0 8px;
}

.page-about .about-stat__note {
  font-size: 13px;
  line-height: 1.7;
  color: var(--steel-deep);
  margin: 0;
  padding-top: 12px;
  border-top: 1px solid var(--rule);
}

/* ---------- 团队分工 ---------- */

.page-about .about-roles {
  list-style: none;
  margin: 8px 0 0;
  padding: 0;
  border-top: 1px solid var(--rule);
}

.page-about .about-role {
  display: grid;
  grid-template-columns: 56px minmax(0, 1fr);
  gap: 16px;
  padding: 22px 0;
  border-bottom: 1px solid var(--rule);
}

.page-about .about-role__count {
  font-family: var(--font-mono);
  font-size: 32px;
  line-height: 1;
  letter-spacing: .02em;
  color: var(--ink);
  margin: 0;
}

.page-about .about-role__name {
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 19px;
  color: var(--ink);
  margin: 0 0 8px;
}

.page-about .about-role__text p {
  font-size: 14px;
  line-height: 1.8;
  color: var(--ink-soft);
  margin: 0;
  max-width: 40em;
}

.page-about .about-quote {
  margin: 28px 0 0;
  padding-left: 20px;
  border-left: 2px solid var(--wood);
  font-family: var(--font-display);
  font-size: 17px;
  line-height: 1.7;
  color: var(--wood);
}

/* ---------- 流程 ---------- */

.page-about .about-process {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 32px;
}

.page-about .about-steps {
  list-style: none;
  margin: 24px 0 0;
  padding: 0;
  counter-reset: step;
}

.page-about .about-step {
  padding: 18px 0 18px 44px;
  border-bottom: 1px solid var(--rule);
  position: relative;
}

.page-about .about-step:first-child {
  border-top: 1px solid var(--rule);
}

.page-about .about-step__idx {
  position: absolute;
  left: 0;
  top: 18px;
  font-family: var(--font-mono);
  font-size: 15px;
  color: var(--wood-light);
}

.page-about .about-step__name {
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 17px;
  color: var(--ink);
  margin: 0 0 6px;
}

.page-about .about-step p {
  font-size: 14px;
  line-height: 1.8;
  color: var(--ink-soft);
  margin: 0;
  max-width: 38em;
}

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

.page-about .about-process__media img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
  aspect-ratio: 3 / 2;
  border: 1px solid var(--about-line-strong);
  filter: saturate(.82) brightness(.94);
}

.page-about .about-process__media .media__caption {
  font-size: 13px;
  line-height: 1.7;
  color: var(--steel-deep);
  margin-top: 10px;
}

/* ---------- 年表 ---------- */

.page-about .about-tl__media {
  margin: 28px 0 8px;
}

.page-about .about-tl__media img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
  aspect-ratio: 10 / 7;
  border: 1px solid var(--about-line-strong);
  filter: saturate(.8) brightness(.92);
}

.page-about .about-tl {
  position: relative;
  margin-top: 24px;
  padding-left: 22px;
}

.page-about .about-tl::before {
  content: "";
  position: absolute;
  left: 5px;
  top: 10px;
  bottom: 10px;
  width: 1px;
  background: var(--wood);
  opacity: .5;
}

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

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

.page-about .about-tl__head {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 6px 14px;
  padding: 18px 0;
  cursor: pointer;
  list-style: none;
  transition: color .2s var(--ease);
}

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

.page-about .about-tl__head:hover .about-tl__phase {
  color: var(--wood);
}

.page-about .about-tl__dot {
  position: absolute;
  left: -22px;
  top: 25px;
  width: 11px;
  height: 11px;
  border-radius: 50%;
  border: 1px solid var(--wood);
  background: var(--ivory);
  transition: background .25s var(--ease), border-color .25s var(--ease);
}

.page-about .about-tl__item[open] .about-tl__dot {
  background: var(--amber);
  border-color: var(--amber);
}

.page-about .about-tl__phase {
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 18px;
  color: var(--ink);
}

.page-about .about-tl__hint {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .05em;
  color: var(--steel-deep);
}

.page-about .about-tl__item[open] .about-tl__hint {
  color: var(--amber-deep);
}

.page-about .about-tl__body {
  padding: 0 0 20px;
}

.page-about .about-tl__body p {
  font-size: 14px;
  line-height: 1.85;
  color: var(--ink-soft);
  margin: 0;
  max-width: 40em;
}

/* ---------- 图表 ---------- */

.page-about .about-chart {
  margin: 32px 0 0;
  padding: 20px 20px 14px;
  background: var(--paper);
  border: 1px solid var(--rule);
}

.page-about .about-chart__caption {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .08em;
  color: var(--steel-deep);
  margin-bottom: 12px;
}

.page-about .about-chart svg {
  display: block;
  width: 100%;
  height: auto;
  max-width: 100%;
  overflow: visible;
}

.page-about .about-chart__axis {
  stroke: var(--rule);
  stroke-width: 1;
}

.page-about .about-chart__line {
  fill: none;
  stroke: var(--wood);
  stroke-width: 2;
  stroke-linejoin: round;
  stroke-linecap: round;
}

.page-about .about-chart__pt {
  fill: var(--paper);
  stroke: var(--wood);
  stroke-width: 2;
}

.page-about .about-chart__pt--now {
  fill: var(--amber);
  stroke: var(--amber-deep);
}

.page-about .about-chart__foot {
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: .08em;
  color: var(--amber-deep);
  text-align: right;
  margin: 6px 0 0;
}

/* ---------- 收尾 ---------- */

.page-about .about-cta {
  background: var(--ink-green);
  border-top: 1px solid var(--about-line);
  padding: 48px 0;
}

.page-about .about-cta__inner {
  display: grid;
  gap: 26px;
}

.page-about .about-cta__title {
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 24px;
  line-height: 1.4;
  color: var(--ivory);
  margin: 0 0 14px;
}

.page-about .about-cta__text p {
  font-size: 15px;
  line-height: 1.85;
  color: rgba(241, 235, 223, .78);
  margin: 0;
  max-width: 38em;
}

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

/* ---------- 断点 ---------- */

@media (min-width: 700px) {
  .page-about .about-hero__title {
    font-size: 46px;
  }

  .page-about .about-section__title {
    font-size: 30px;
  }

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

  .page-about .about-process {
    grid-template-columns: minmax(0, 1fr) minmax(0, .8fr);
    align-items: start;
  }

  .page-about .about-cta__inner {
    grid-template-columns: minmax(0, 1fr) auto;
    align-items: center;
    gap: 40px;
  }
}

@media (min-width: 960px) {
  .page-about .about-hero {
    padding-top: 40px;
  }

  .page-about .about-hero__eyebrow {
    margin-bottom: 24px;
  }

  .page-about .about-hero__title {
    font-size: 54px;
    margin-bottom: 44px;
  }

  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 1.35fr) minmax(0, 1fr);
    align-items: end;
    gap: 56px;
    padding-bottom: 48px;
  }

  .page-about .about-hero__facts {
    border-top: 0;
    border-bottom: 0;
  }

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

  .page-about .about-body__grid {
    grid-template-columns: var(--about-rail) minmax(0, 1fr);
    gap: 64px;
  }

  .page-about .about-rail {
    padding: 64px 0 0;
    border-bottom: 0;
    position: sticky;
    top: 96px;
    align-self: start;
  }

  .page-about .about-index .index-nav__list {
    flex-direction: column;
    gap: 0;
    border-left: 1px solid var(--rule);
  }

  .page-about .about-index .index-nav__link {
    display: flex;
    padding: 9px 0 9px 14px;
    margin-left: -1px;
    border-bottom: 0;
    border-left: 2px solid transparent;
    font-size: 13px;
    line-height: 1.5;
  }

  .page-about .about-index .index-nav__link:hover {
    border-left-color: var(--wood-light);
    color: var(--wood);
  }

  .page-about .about-index .index-nav__link[aria-current="true"] {
    border-left-color: var(--amber);
    color: var(--ink);
  }

  .page-about .about-section {
    padding: 64px 0 72px;
  }

  .page-about .about-section__title {
    font-size: 32px;
  }

  .page-about .about-role {
    grid-template-columns: 80px minmax(0, 1fr);
    gap: 24px;
    padding: 26px 0;
  }

  .page-about .about-role__count {
    font-size: 40px;
  }

  .page-about .about-stats--three {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

@media (min-width: 1180px) {
  .page-about .about-hero__title {
    font-size: 60px;
  }

  .page-about .about-process {
    grid-template-columns: minmax(0, 1.15fr) minmax(0, .85fr);
    gap: 56px;
  }

  .page-about .about-chart {
    padding: 24px 28px 16px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-stat,
  .page-about .about-tl__dot,
  .page-about .about-index .index-nav__link,
  .page-about .about-hero__crumbs a {
    transition: none;
  }
}
<<<END>>>