.page-about {
  --about-pad: clamp(20px, 4vw, 44px);
  --about-gap: clamp(28px, 5vw, 64px);
  --about-line: rgba(232, 255, 58, .14);
  padding-bottom: clamp(56px, 9vw, 128px);
}

/* ---------- 面包屑 ---------- */
.page-about .breadcrumbs {
  max-width: var(--shell-max);
  margin: calc(var(--bar-h) + 18px) auto 0;
  padding: 0 var(--about-pad);
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 13px;
  color: var(--ink-muted);
}
.page-about .breadcrumbs__link {
  color: var(--ink-muted);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color .2s var(--ease), border-color .2s var(--ease);
}
.page-about .breadcrumbs__link:hover {
  color: var(--lime);
  border-bottom-color: var(--lime);
}
.page-about .breadcrumbs__item {
  color: var(--ink);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  padding-top: clamp(24px, 4vw, 52px);
}
.page-about .about-hero__grid {
  display: grid;
  gap: clamp(26px, 4vw, 56px);
  align-items: start;
}
.page-about .about-hero h1 {
  margin: 14px 0 20px;
  font-size: clamp(32px, 4.6vw, 58px);
  line-height: 1.06;
  font-weight: 800;
  letter-spacing: -0.02em;
  color: var(--ink);
}
.page-about .about-hero .lede {
  max-width: 54ch;
  font-size: clamp(16px, 1.35vw, 18px);
  line-height: 1.85;
  color: var(--ink);
}
.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 28px;
}
.page-about .about-hero__visual {
  margin: 0;
  position: relative;
}
.page-about .about-hero__visual img {
  display: block;
  width: 100%;
  height: auto;
  max-width: 100%;
  aspect-ratio: 7 / 5;
  object-fit: cover;
  border: 1px solid var(--hairline);
  border-radius: var(--radius);
  filter: saturate(.9) contrast(1.05);
}
.page-about .about-hero__caption {
  margin-top: 12px;
  padding-left: 12px;
  border-left: 1px solid var(--hairline-strong);
  font-size: 13px;
  line-height: 1.7;
  color: var(--ink-muted);
}

.page-about .about-hero__facts {
  margin-top: clamp(36px, 5vw, 68px);
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--about-line);
  border-top: 1px solid var(--about-line);
  border-bottom: 1px solid var(--about-line);
}
.page-about .about-fact {
  background: var(--green-night);
  padding: 20px 16px;
  display: flex;
  flex-direction: column;
  gap: 8px;
}
.page-about .about-fact__num {
  font-family: var(--font-num);
  font-variant-numeric: tabular-nums;
  font-size: clamp(26px, 3vw, 38px);
  font-weight: 700;
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--lime);
}
.page-about .about-fact__label {
  font-size: 13px;
  color: var(--ink-muted);
}

/* ---------- 章节索引条 ---------- */
.page-about .about-jump {
  margin-top: clamp(40px, 6vw, 76px);
  position: sticky;
  top: var(--bar-h);
  z-index: 4;
  background: rgba(10, 20, 16, .94);
  border-top: 1px solid var(--about-line);
  border-bottom: 1px solid var(--about-line);
}
.page-about .about-jump__inner {
  display: flex;
  gap: 8px;
  overflow-x: auto;
  padding: 12px 0;
  scrollbar-width: none;
}
.page-about .about-jump__inner::-webkit-scrollbar {
  display: none;
}
.page-about .about-jump__link {
  flex: 0 0 auto;
  padding: 6px 12px;
  font-family: var(--font-num);
  font-size: 13px;
  letter-spacing: .02em;
  color: var(--ink-muted);
  text-decoration: none;
  border: 1px solid var(--about-line);
  border-radius: var(--radius);
  transition: color .2s var(--ease), border-color .2s var(--ease), background-color .2s var(--ease);
}
.page-about .about-jump__link:hover {
  color: var(--ink);
  border-color: var(--hairline-strong);
}
.page-about .about-jump__link[aria-current="page"] {
  color: var(--green-night);
  background: var(--lime);
  border-color: var(--lime);
}

/* ---------- 章节通用 ---------- */
.page-about .about-chapter {
  padding-top: clamp(48px, 7vw, 96px);
}
.page-about .about-chapter__head {
  max-width: 60ch;
  margin-bottom: clamp(28px, 4vw, 48px);
}
.page-about .about-chapter__intro {
  margin-top: 16px;
  font-size: 16px;
  line-height: 1.85;
  color: var(--ink-muted);
}
.page-about .about-chapter__body {
  display: grid;
  gap: clamp(24px, 4vw, 48px);
}
.page-about .about-prose p {
  margin: 0 0 1.1em;
  font-size: 16px;
  line-height: 1.85;
  color: var(--ink);
}
.page-about .about-prose p:last-child {
  margin-bottom: 0;
}

.page-about .about-aside {
  display: flex;
  flex-direction: column;
  gap: 16px;
}
.page-about .about-aside__note {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: 18px 20px;
  border-left: 2px solid var(--heat-cool);
  background: var(--green-train);
}
.page-about .about-aside__num {
  font-family: var(--font-num);
  font-variant-numeric: tabular-nums;
  font-size: clamp(28px, 3.4vw, 42px);
  font-weight: 700;
  line-height: 1;
  color: var(--heat-cool);
}
.page-about .about-aside__label {
  font-size: 13px;
  color: var(--ink-muted);
}

/* ---------- 时间线 ---------- */
.page-about .about-timeline__list {
  position: relative;
  list-style: none;
  margin: 0;
  padding: 0 0 0 26px;
  display: grid;
  gap: clamp(30px, 4.5vw, 62px);
}
.page-about .about-timeline__list::before {
  content: "";
  position: absolute;
  left: 5px;
  top: 10px;
  bottom: 10px;
  width: 1px;
  background: linear-gradient(180deg, var(--hairline-strong), var(--about-line) 55%, transparent);
}
.page-about .about-timeline__item {
  position: relative;
}
.page-about .about-timeline__item::before {
  content: "";
  position: absolute;
  left: -26px;
  top: 8px;
  width: 9px;
  height: 9px;
  background: var(--green-night);
  border: 1px solid var(--lime);
  transform: rotate(45deg);
  transition: background-color .25s var(--ease), border-color .25s var(--ease);
}
.page-about .about-timeline__item:hover::before,
.page-about .about-timeline__item:focus-within::before {
  background: var(--lime);
}
.page-about .about-timeline__year {
  display: flex;
  align-items: baseline;
  gap: 10px;
  margin-bottom: 10px;
}
.page-about .about-timeline__num {
  font-family: var(--font-num);
  font-variant-numeric: tabular-nums;
  font-size: clamp(24px, 3vw, 34px);
  font-weight: 700;
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--lime);
}
.page-about .about-timeline__body {
  padding: 20px 20px 22px;
  background: var(--green-deep);
  border: 1px solid var(--about-line);
  border-radius: var(--radius);
  box-shadow: var(--shadow-soft);
  transition: border-color .25s var(--ease), transform .25s var(--ease);
}
.page-about .about-timeline__item:hover .about-timeline__body,
.page-about .about-timeline__item:focus-within .about-timeline__body {
  border-color: var(--hairline-strong);
  transform: translateY(-2px);
}
.page-about .about-timeline__title {
  margin: 0 0 10px;
  font-size: clamp(18px, 1.6vw, 22px);
  font-weight: 800;
  line-height: 1.3;
  letter-spacing: -0.01em;
  color: var(--ink);
}
.page-about .about-timeline__body p {
  margin: 0 0 16px;
  font-size: 15px;
  line-height: 1.85;
  color: var(--ink-muted);
}
.page-about .about-timeline__facts {
  list-style: none;
  margin: 0;
  padding: 14px 0 0;
  border-top: 1px solid var(--about-line);
  display: flex;
  flex-wrap: wrap;
  gap: 10px 28px;
}
.page-about .about-timeline__facts li {
  font-size: 13px;
  color: var(--ink-muted);
  display: flex;
  align-items: baseline;
  gap: 8px;
}
.page-about .about-timeline__fact-num {
  font-family: var(--font-num);
  font-variant-numeric: tabular-nums;
  font-size: 18px;
  font-weight: 700;
  color: var(--ink);
}
.page-about .about-timeline__tag {
  font-family: var(--font-num);
  font-size: 12px;
  letter-spacing: .04em;
}

/* ---------- 团队 ---------- */
.page-about .about-team__grid {
  display: grid;
  gap: clamp(24px, 4vw, 44px);
}
.page-about .about-team__figure {
  margin: 0;
}
.page-about .about-team__figure img {
  display: block;
  width: 100%;
  height: auto;
  max-width: 100%;
  aspect-ratio: 4 / 3;
  object-fit: cover;
  border: 1px solid var(--about-line);
  border-radius: var(--radius);
}
.page-about .about-team__caption {
  margin-top: 12px;
  font-size: 13px;
  line-height: 1.7;
  color: var(--ink-muted);
}
.page-about .about-team__panel {
  padding: 24px 20px;
  background: var(--green-deep);
  border: 1px solid var(--about-line);
  border-radius: var(--radius);
}
.page-about .about-team__hint {
  margin: 22px 0 0;
  padding-top: 18px;
  border-top: 1px solid var(--about-line);
  font-size: 14px;
  line-height: 1.8;
  color: var(--ink-muted);
}
.page-about .about-team__body {
  margin-top: clamp(30px, 4vw, 52px);
}
.page-about .about-team__links {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  align-content: start;
}

.page-about .about-ring {
  display: grid;
  gap: 24px;
  justify-items: center;
}
.page-about .about-ring__chart {
  position: relative;
  width: 168px;
  height: 168px;
  border-radius: 50%;
  border: 1px solid var(--about-line);
  background: conic-gradient(
    var(--heat-hot) 0 47%,
    var(--heat-cool) 47% 78%,
    var(--green-train) 78% 100%
  );
}
.page-about .about-ring__chart::after {
  content: "";
  position: absolute;
  inset: 34px;
  border-radius: 50%;
  background: var(--green-deep);
  border: 1px solid var(--about-line);
}
.page-about .about-ring__legend {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 12px;
  width: 100%;
}
.page-about .about-ring__legend-item {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 14px;
  color: var(--ink);
}
.page-about .about-ring__dot {
  flex: 0 0 auto;
  width: 10px;
  height: 10px;
  border-radius: 1px;
}
.page-about .about-ring__dot--a { background: var(--heat-hot); }
.page-about .about-ring__dot--b { background: var(--heat-cool); }
.page-about .about-ring__dot--c { background: var(--green-train); border: 1px solid var(--hairline-strong); }
.page-about .about-ring__label {
  flex: 1 1 auto;
  color: var(--ink-muted);
}
.page-about .about-ring__val {
  font-family: var(--font-num);
  font-variant-numeric: tabular-nums;
  font-weight: 700;
  color: var(--ink);
}

/* ---------- 覆盖与伙伴 ---------- */
.page-about .about-reach {
  padding-top: clamp(48px, 7vw, 96px);
}
.page-about .about-reach__grid {
  display: grid;
  gap: 16px;
}
.page-about .about-reach__card {
  display: flex;
  flex-direction: column;
  gap: 8px;
  padding: 24px 20px;
}
.page-about .about-reach__card--blue {
  background: var(--blue-night);
}
.page-about .about-reach__num {
  font-family: var(--font-num);
  font-variant-numeric: tabular-nums;
  font-size: clamp(36px, 4.4vw, 52px);
  font-weight: 700;
  line-height: 1;
  letter-spacing: -0.03em;
  color: var(--lime);
}
.page-about .about-reach__pct {
  font-size: .55em;
  margin-left: 2px;
  color: var(--lime-dim);
}
.page-about .about-reach__label {
  font-size: 14px;
  font-weight: 600;
  color: var(--ink);
}
.page-about .about-reach__text {
  margin: 6px 0 0;
  font-size: 14px;
  line-height: 1.8;
  color: var(--ink-muted);
}
.page-about .about-reach__body {
  margin-top: clamp(30px, 4vw, 52px);
}

/* ---------- 年度报告与栏目 ---------- */
.page-about .about-report__layout {
  display: grid;
  gap: clamp(28px, 4vw, 52px);
  align-items: start;
}
.page-about .about-report__subtitle {
  margin: 0 0 22px;
  font-size: 15px;
  font-weight: 600;
  letter-spacing: .02em;
  color: var(--ink-muted);
}
.page-about .about-report__items {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 1px;
  background: var(--about-line);
  border-top: 1px solid var(--about-line);
  border-bottom: 1px solid var(--about-line);
}
.page-about .about-report__item {
  display: grid;
  grid-template-columns: 44px minmax(0, 1fr);
  gap: 16px;
  padding: 18px 16px;
  background: var(--green-night);
  transition: background-color .22s var(--ease);
}
.page-about .about-report__item:hover {
  background: var(--green-train);
}
.page-about .about-report__idx {
  font-family: var(--font-num);
  font-variant-numeric: tabular-nums;
  font-size: 15px;
  font-weight: 700;
  color: var(--lime);
  padding-top: 2px;
}
.page-about .about-report__name {
  margin: 0 0 6px;
  font-size: 16px;
  font-weight: 700;
  color: var(--ink);
}
.page-about .about-report__desc {
  margin: 0;
  font-size: 14px;
  line-height: 1.78;
  color: var(--ink-muted);
}
.page-about .about-report__figure {
  margin: 0;
}
.page-about .about-report__figure img {
  display: block;
  width: 100%;
  height: auto;
  max-width: 100%;
  aspect-ratio: 3 / 2;
  object-fit: cover;
  border: 1px solid var(--about-line);
  border-radius: var(--radius);
}
.page-about .about-report__caption {
  margin-top: 12px;
  padding-left: 12px;
  border-left: 1px solid var(--heat-cool);
  font-size: 13px;
  line-height: 1.75;
  color: var(--ink-muted);
}

/* ---------- 收尾 ---------- */
.page-about .about-outro {
  padding-top: clamp(48px, 7vw, 96px);
}
.page-about .about-outro__inner {
  padding: clamp(26px, 4vw, 44px);
  background: linear-gradient(135deg, var(--blue-night) 0%, var(--green-deep) 58%, var(--green-train) 100%);
  border: 1px solid var(--hairline-strong);
  border-radius: var(--radius);
  display: grid;
  gap: 26px;
}
.page-about .about-outro__copy p {
  margin: 14px 0 0;
  max-width: 58ch;
  font-size: 15px;
  line-height: 1.85;
  color: var(--ink);
}
.page-about .about-outro__links {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

/* ---------- 桌面栅格 ---------- */
@media (min-width: 861px) {
  .page-about .about-chapter__body {
    grid-template-columns: minmax(0, 7fr) minmax(0, 4fr);
  }
  .page-about .about-team__grid {
    grid-template-columns: minmax(0, 5fr) minmax(0, 7fr);
    align-items: stretch;
  }
  .page-about .about-ring {
    grid-template-columns: 176px minmax(0, 1fr);
    align-items: center;
    justify-items: start;
  }
  .page-about .about-reach__grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
  .page-about .about-report__layout {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
  }
  .page-about .about-outro__inner {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    align-items: center;
  }
  .page-about .about-outro__links {
    justify-content: flex-end;
  }
  .page-about .about-timeline__list {
    padding-left: 168px;
  }
  .page-about .about-timeline__list::before {
    left: 148px;
  }
  .page-about .about-timeline__item::before {
    left: 143px;
    top: 10px;
  }
  .page-about .about-timeline__year {
    position: absolute;
    left: 0;
    top: 2px;
    width: 120px;
    flex-direction: column;
    align-items: flex-end;
    gap: 8px;
    margin-bottom: 0;
  }
  .page-about .about-timeline__num {
    font-size: clamp(28px, 2.6vw, 38px);
  }
}

@media (min-width: 981px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
  }
  .page-about .about-hero__facts {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

@media (min-width: 1200px) {
  .page-about .about-fact {
    padding: 26px 22px;
  }
}

/* ---------- 窄屏兜底 ---------- */
@media (max-width: 520px) {
  .page-about .about-report__item {
    grid-template-columns: 34px minmax(0, 1fr);
    gap: 12px;
    padding: 16px 12px;
  }
  .page-about .about-timeline__body {
    padding: 18px 16px 20px;
  }
  .page-about .about-hero__actions .btn,
  .page-about .about-outro__links .btn,
  .page-about .about-team__links .btn {
    width: 100%;
    justify-content: center;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-timeline__item::before,
  .page-about .about-timeline__body,
  .page-about .about-jump__link,
  .page-about .breadcrumbs__link,
  .page-about .about-report__item {
    transition: none;
  }
  .page-about .about-timeline__item:hover .about-timeline__body,
  .page-about .about-timeline__item:focus-within .about-timeline__body {
    transform: none;
  }
}
<<<END>>>