.page-about {
  background: var(--c-abyss);
  color: var(--c-mist);
  font-family: var(--font-body);
  overflow-x: hidden;
}

.page-about h1,
.page-about h2,
.page-about h3 {
  font-family: var(--font-head);
  letter-spacing: -0.01em;
}

.page-about .about-crumb {
  padding: 18px 0 8px;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  padding: 20px 0 clamp(40px, 7vw, 84px);
  border-bottom: 1px solid var(--line);
}

.page-about .about-hero__inner {
  display: grid;
  gap: 32px;
}

.page-about h1 {
  margin: 14px 0 0;
  font-size: clamp(34px, 6.4vw, 68px);
  line-height: 0.98;
  letter-spacing: -0.02em;
  color: var(--c-paper);
}

.page-about .about-hero__lede {
  margin: 20px 0 0;
  max-width: 34em;
  font-size: clamp(16px, 1.5vw, 19px);
  line-height: 1.8;
  color: var(--c-mist);
}

.page-about .about-points {
  list-style: none;
  margin: 28px 0 0;
  padding: 0;
  border-top: 1px solid var(--line-soft);
}

.page-about .about-point {
  display: grid;
  gap: 6px;
  padding: 15px 0;
  border-bottom: 1px solid var(--line-soft);
}

.page-about .about-point p {
  margin: 0;
  font-size: 15px;
  line-height: 1.75;
  color: var(--c-mist);
}

.page-about .about-point__key {
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 500;
  letter-spacing: 0.22em;
  color: var(--c-orange);
}

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

.page-about .about-hero__media {
  aspect-ratio: 16 / 9;
}

/* ---------- 主栅格与粘性索引 ---------- */
.page-about .about-body {
  padding: clamp(36px, 6vw, 72px) 0;
}

.page-about .about-body__grid {
  display: grid;
  gap: 28px;
}

.page-about .about-index {
  border-left: 1px solid var(--line);
  padding-left: 16px;
}

.page-about .about-index__title {
  margin: 0 0 10px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.22em;
  color: var(--c-sand);
}

.page-about .about-index__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 2px 18px;
}

.page-about .about-index__link {
  display: inline-block;
  padding: 6px 0;
  font-size: 14px;
  color: var(--c-mist);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color 0.2s var(--ease), border-color 0.2s var(--ease);
}

.page-about .about-index__link:hover,
.page-about .about-index__link:focus-visible {
  color: var(--c-paper);
  border-bottom-color: var(--c-orange);
  outline: none;
}

.page-about .about-index__stamp {
  margin: 14px 0 0;
  color: var(--c-celadon);
}

/* ---------- 章节骨架 ---------- */
.page-about .about-chapter {
  padding-bottom: clamp(34px, 5vw, 60px);
  margin-bottom: clamp(34px, 5vw, 60px);
  border-bottom: 1px solid var(--line-soft);
}

.page-about .about-chapter:last-child {
  border-bottom: 0;
  margin-bottom: 0;
  padding-bottom: 0;
}

.page-about .about-chapter__head {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  align-items: baseline;
  gap: 10px 20px;
  padding-bottom: 14px;
  margin-bottom: 24px;
  border-bottom: 1px solid var(--line);
}

.page-about h2 {
  margin: 0;
  max-width: 20em;
  font-size: clamp(23px, 3.4vw, 34px);
  line-height: 1.14;
  font-weight: 900;
  color: var(--c-paper);
}

.page-about .about-chapter__head .meta-mono {
  color: var(--c-sand);
}

.page-about .prose p {
  margin: 0 0 1.15em;
  max-width: 38em;
  font-size: 16px;
  line-height: 1.85;
  color: var(--c-mist);
}

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

/* ---------- 时间轴 ---------- */
.page-about .about-years {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 1px;
  margin-bottom: 30px;
  background: var(--line-soft);
  border: 1px solid var(--line-soft);
}

.page-about .about-years__item {
  display: flex;
  flex-direction: column;
  gap: 3px;
  padding: 11px 10px;
  background: var(--c-abyss);
  text-decoration: none;
  transition: background 0.2s var(--ease);
}

.page-about .about-years__item:hover,
.page-about .about-years__item:focus-visible {
  background: var(--c-panel);
  outline: none;
}

.page-about .about-years__num {
  font-family: var(--font-mono);
  font-size: 17px;
  font-weight: 500;
  color: var(--c-sand);
  transition: color 0.2s var(--ease);
}

.page-about .about-years__item:hover .about-years__num,
.page-about .about-years__item:focus-visible .about-years__num {
  color: var(--c-orange);
}

.page-about .about-years__tag {
  font-size: 12px;
  color: var(--c-mist);
}

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

.page-about .about-milestone {
  display: grid;
  gap: 8px;
  scroll-margin-top: 24px;
}

.page-about .about-milestone__year {
  margin: 0;
  font-family: var(--font-mono);
  font-size: clamp(28px, 5vw, 42px);
  font-weight: 500;
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--c-sand);
  transition: color 0.25s var(--ease);
}

.page-about .about-milestone h3 {
  margin: 0 0 8px;
  font-size: 18px;
  line-height: 1.4;
  font-weight: 900;
  color: var(--c-paper);
}

.page-about .about-milestone__body > p {
  margin: 0;
  max-width: 38em;
  font-size: 15px;
  line-height: 1.8;
  color: var(--c-mist);
}

.page-about .about-more {
  margin-top: 12px;
  max-width: 38em;
  border-top: 1px solid var(--line-soft);
}

.page-about .about-more summary {
  padding: 10px 0;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.12em;
  color: var(--c-celadon);
  cursor: pointer;
  list-style: none;
}

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

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

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

.page-about .about-more summary:hover,
.page-about .about-more summary:focus-visible {
  color: var(--c-orange);
  outline: none;
}

.page-about .about-more p {
  margin: 0 0 14px;
  font-size: 14px;
  line-height: 1.8;
  color: var(--c-mist);
}

.page-about .about-timeline__figure {
  margin: 8px 0 30px;
}

.page-about .about-timeline__figure figure {
  margin: 0;
}

.page-about .about-timeline__media {
  aspect-ratio: 7 / 4;
}

/* ---------- 服务规模 ---------- */
.page-about .about-coverage {
  display: grid;
  gap: 26px;
}

.page-about .about-map {
  margin: 0;
  padding: 16px 12px 10px;
  background: var(--c-panel);
  border: 1px solid var(--line);
}

.page-about .about-map svg {
  display: block;
  width: 100%;
  height: auto;
}

.page-about .about-map__line {
  fill: none;
  stroke: var(--c-steel);
  stroke-width: 1.6;
}

.page-about .about-map__node {
  fill: var(--c-sand);
}

.page-about .about-map__node--base {
  fill: var(--c-orange);
}

.page-about .about-map__halo {
  fill: none;
  stroke: var(--c-orange);
  stroke-opacity: 0.32;
  stroke-width: 1.2;
}

.page-about .about-map__label {
  font-family: var(--font-mono);
  font-size: 13px;
  fill: var(--c-mist);
}

.page-about .about-map__label--base {
  font-family: var(--font-mono);
  font-size: 13px;
  fill: var(--c-orange-lift);
}

.page-about .about-stats {
  list-style: none;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin: 26px 0 0;
  padding: 0;
  background: var(--line-soft);
  border: 1px solid var(--line-soft);
}

.page-about .about-stat {
  display: flex;
  flex-direction: column;
  gap: 5px;
  padding: 16px 14px;
  background: var(--c-abyss);
  transition: background 0.2s var(--ease);
}

.page-about .about-stat:hover,
.page-about .about-stat:focus-within {
  background: var(--c-panel);
}

.page-about .about-stat__num {
  font-family: var(--font-head);
  font-size: clamp(26px, 4vw, 38px);
  font-weight: 900;
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--c-paper);
}

.page-about .about-stat__unit {
  margin-left: 2px;
  font-size: 0.44em;
  font-weight: 700;
  color: var(--c-sand);
}

.page-about .about-stat__label {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--c-mist);
}

.page-about .about-stat__tip {
  max-height: 0;
  overflow: hidden;
  opacity: 0;
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--c-celadon);
  transition: opacity 0.2s var(--ease), max-height 0.2s var(--ease);
}

.page-about .about-stat:hover .about-stat__tip,
.page-about .about-stat:focus-within .about-stat__tip {
  max-height: 3em;
  opacity: 1;
}

/* ---------- 团队（纸本区） ---------- */
.page-about .about-team {
  padding: clamp(42px, 6vw, 78px) 0;
  color: var(--c-ink);
}

.page-about .about-team .eyebrow {
  color: var(--c-orange);
  margin: 0 0 10px;
}

.page-about .about-team h2 {
  color: var(--c-ink);
  max-width: 18em;
}

.page-about .about-team__lede {
  margin: 16px 0 0;
  max-width: 40em;
  font-size: 16px;
  line-height: 1.85;
  color: rgba(20, 33, 46, 0.78);
}

.page-about .about-team__grid {
  display: grid;
  gap: 30px;
  margin-top: 30px;
}

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

.page-about .about-team__media {
  aspect-ratio: 12 / 7;
}

.page-about .about-team__list {
  list-style: none;
  margin: 0;
  padding: 0;
}

.page-about .about-team__row {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  align-items: baseline;
  gap: 4px 12px;
  padding: 13px 0;
  border-bottom: 1px solid var(--line-paper);
}

.page-about .about-team__name {
  font-family: var(--font-head);
  font-size: 16px;
  font-weight: 900;
  color: var(--c-ink);
}

.page-about .about-team__count {
  font-family: var(--font-mono);
  font-size: 20px;
  font-weight: 500;
  color: var(--c-ink);
}

.page-about .about-team__bar {
  grid-column: 1 / -1;
  display: block;
  height: 3px;
  background: rgba(20, 33, 46, 0.12);
}

.page-about .about-team__fill {
  display: block;
  height: 100%;
  width: 10%;
  background: var(--c-orange);
}

.page-about .about-team__row:nth-child(1) .about-team__fill { width: 24%; }
.page-about .about-team__row:nth-child(2) .about-team__fill { width: 26%; }
.page-about .about-team__row:nth-child(3) .about-team__fill { width: 20%; }
.page-about .about-team__row:nth-child(4) .about-team__fill { width: 17%; }
.page-about .about-team__row:nth-child(5) .about-team__fill { width: 13%; }

.page-about .about-team__desc {
  grid-column: 1 / -1;
  margin: 6px 0 0;
  font-size: 14px;
  line-height: 1.72;
  color: rgba(20, 33, 46, 0.76);
}

/* ---------- 合作生态 ---------- */
.page-about .about-eco {
  padding: clamp(42px, 6vw, 78px) 0;
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}

.page-about .about-eco .about-chapter__head {
  margin-bottom: 26px;
}

.page-about .about-eco__grid {
  row-gap: 26px;
}

.page-about .about-eco__item {
  padding-top: 16px;
  border-top: 2px solid var(--c-steel);
}

.page-about .about-eco__item:nth-child(1) {
  border-top-color: var(--c-orange);
}

.page-about .about-eco__k {
  margin: 0 0 10px;
  color: var(--c-sand);
}

.page-about .about-eco__item h3 {
  margin: 0 0 10px;
  font-size: 18px;
  line-height: 1.4;
  font-weight: 900;
  color: var(--c-paper);
}

.page-about .about-eco__item p {
  margin: 0;
  font-size: 15px;
  line-height: 1.8;
  color: var(--c-mist);
}

.page-about .about-eco__note {
  display: flex;
  gap: 14px;
  max-width: 44em;
  margin: 32px 0 0;
  padding-top: 18px;
  border-top: 1px solid var(--line-soft);
  font-size: 14px;
  line-height: 1.8;
  color: var(--c-mist);
}

.page-about .about-eco__note-mark {
  flex: none;
  width: 2px;
  background: var(--c-orange);
}

/* ---------- 更新节奏 ---------- */
.page-about .about-cadence {
  padding: clamp(40px, 6vw, 72px) 0;
  background: var(--c-panel);
  border-bottom: 1px solid var(--line);
}

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

.page-about .about-cadence__head .eyebrow {
  margin: 0 0 10px;
}

.page-about .about-cadence__lede {
  margin: 16px 0 0;
  max-width: 32em;
  font-size: 15px;
  line-height: 1.85;
  color: var(--c-mist);
}

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

.page-about .about-cadence__item {
  padding: 15px 16px;
  background: var(--c-abyss);
}

.page-about .about-cadence__k {
  color: var(--c-sand);
}

.page-about .about-cadence__item h3 {
  margin: 6px 0 5px;
  font-size: 17px;
  font-weight: 900;
  color: var(--c-paper);
}

.page-about .about-cadence__item p {
  margin: 0;
  font-size: 14px;
  line-height: 1.75;
  color: var(--c-mist);
}

.page-about .about-cadence__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 26px;
}

/* ---------- 结尾行动区 ---------- */
.page-about .about-cta {
  padding: clamp(38px, 6vw, 68px) 0;
  color: var(--c-ink);
}

.page-about .about-cta .eyebrow {
  margin: 0 0 10px;
  color: var(--c-orange);
}

.page-about .about-cta h2 {
  color: var(--c-ink);
  max-width: 16em;
}

.page-about .about-cta__inner {
  display: grid;
  gap: 24px;
}

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

/* ---------- 断点 ---------- */
@media (min-width: 640px) {
  .page-about .about-point {
    grid-template-columns: 92px minmax(0, 1fr);
    align-items: baseline;
    gap: 16px;
  }

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

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

@media (min-width: 900px) {
  .page-about .about-hero__inner {
    grid-template-columns: minmax(0, 5fr) minmax(0, 7fr);
    gap: 52px;
    align-items: start;
  }

  .page-about .about-hero__figure {
    margin-top: 12px;
  }

  .page-about .about-coverage {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1.05fr);
    gap: 44px;
    align-items: start;
  }

  .page-about .about-team__grid {
    grid-template-columns: minmax(0, 0.85fr) minmax(0, 1.15fr);
    gap: 52px;
    align-items: start;
  }

  .page-about .about-eco__item:nth-child(2) {
    margin-top: 26px;
  }

  .page-about .about-eco__item:nth-child(3) {
    margin-top: 52px;
  }

  .page-about .about-cadence__grid {
    grid-template-columns: minmax(0, 0.8fr) minmax(0, 1.2fr);
    gap: 52px;
    align-items: start;
  }

  .page-about .about-cta__inner {
    grid-template-columns: minmax(0, 1fr) auto;
    align-items: end;
    gap: 44px;
  }

  .page-about .about-cta__links {
    justify-content: flex-end;
  }
}

@media (min-width: 1024px) {
  .page-about .about-body__grid {
    grid-template-columns: 196px minmax(0, 1fr);
    gap: 60px;
    align-items: start;
  }

  .page-about .about-index {
    position: sticky;
    top: 24px;
  }

  .page-about .about-index__list {
    flex-direction: column;
    gap: 1px;
  }

  .page-about .about-index__link {
    padding: 7px 0;
  }

  .page-about .about-milestone {
    grid-template-columns: 118px minmax(0, 1fr);
    gap: 24px;
  }

  .page-about .about-milestone__body {
    position: relative;
    padding: 0 0 30px 26px;
    border-left: 1px solid var(--line);
  }

  .page-about .about-milestone__body::before {
    content: "";
    position: absolute;
    left: -4px;
    top: 9px;
    width: 7px;
    height: 7px;
    background: var(--c-steel);
    transition: background 0.25s var(--ease);
  }

  .page-about .about-milestone:target .about-milestone__body::before {
    background: var(--c-orange);
    width: 9px;
    height: 9px;
    left: -5px;
  }

  .page-about .about-milestone:target .about-milestone__year {
    color: var(--c-orange);
  }

  .page-about .about-timeline__figure {
    grid-column: 1 / -1;
    margin: 0 0 28px 142px;
  }

  .page-about .about-timeline__figure figure {
    max-width: 760px;
  }
}

@media (min-width: 1280px) {
  .page-about .about-body__grid {
    grid-template-columns: 210px minmax(0, 1fr);
    gap: 72px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about * {
    transition-duration: 0.01ms !important;
  }
}
<<<END>>>