.page-about {
  --about-rail-w: 226px;
  --about-band: linear-gradient(180deg, #0C3A2E 0%, #06231C 100%);
  --about-line: 1px solid rgba(23, 92, 73, 0.72);
  --about-rail-top: 124px;
}

/* ---------- 首屏 ---------- */

.page-about .about-hero {
  position: relative;
  overflow: hidden;
  padding: clamp(64px, 11vw, 128px) 0 clamp(48px, 7vw, 88px);
  background: var(--grad-moss);
  border-bottom: var(--about-line);
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  inset: 0 0 auto 0;
  height: 3px;
  background: linear-gradient(90deg, var(--orange) 0%, var(--blue) 55%, rgba(63, 193, 255, 0) 100%);
  opacity: 0.9;
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  right: -14%;
  bottom: -70%;
  width: 52%;
  height: 170%;
  transform: rotate(8deg);
  background: linear-gradient(135deg, rgba(63, 193, 255, 0.16), rgba(63, 193, 255, 0));
  pointer-events: none;
}

.page-about .about-hero__inner {
  position: relative;
  z-index: 1;
}

.page-about .about-hero .breadcrumb {
  margin-bottom: clamp(20px, 3vw, 32px);
}

.page-about .about-hero__kicker {
  margin: 0 0 14px;
}

.page-about .about-hero__title {
  max-width: 20ch;
  margin: 0 0 clamp(16px, 2.4vw, 24px);
}

.page-about .about-hero__lede {
  max-width: 58ch;
  color: var(--sand);
}

.page-about .about-hero__meta {
  display: flex;
  flex-wrap: wrap;
  gap: 10px 30px;
  margin: clamp(24px, 4vw, 38px) 0 0;
  padding: 0;
  list-style: none;
  font-size: 14px;
  color: var(--stone);
  letter-spacing: 0.02em;
}

.page-about .about-hero__meta .num {
  font-family: var(--mono);
  font-size: 18px;
  font-weight: 700;
  color: var(--blue);
  margin-right: 4px;
}

/* ---------- 主体骨架 ---------- */

.page-about .about-body {
  display: grid;
  gap: clamp(28px, 4vw, 56px);
  padding-block: clamp(48px, 8vw, 104px);
}

.page-about .about-rail {
  padding-bottom: 16px;
  border-bottom: var(--about-line);
}

.page-about .about-rail__label {
  margin: 0 0 12px;
  font-size: 12px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--stone);
}

.page-about .about-toc {
  display: flex;
  gap: 20px;
  margin: 0;
  padding: 0 0 4px;
  list-style: none;
  overflow-x: auto;
  scrollbar-width: thin;
}

.page-about .about-toc li {
  flex: 0 0 auto;
}

.page-about .about-toc a {
  display: inline-flex;
  align-items: baseline;
  gap: 8px;
  padding: 4px 0;
  font-size: 14px;
  color: var(--stone);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color 0.2s ease, border-color 0.2s ease;
}

.page-about .about-toc a .num {
  font-family: var(--mono);
  font-size: 12px;
  color: var(--ink-500);
  transition: color 0.2s ease;
}

.page-about .about-toc a:hover,
.page-about .about-toc a:focus-visible {
  color: var(--warm);
  border-bottom-color: var(--blue);
}

.page-about .about-toc a:hover .num,
.page-about .about-toc a:focus-visible .num {
  color: var(--orange);
}

@media (min-width: 1000px) {
  .page-about .about-body {
    grid-template-columns: var(--about-rail-w) minmax(0, 1fr);
    column-gap: clamp(40px, 6vw, 88px);
  }

  .page-about .about-rail {
    position: sticky;
    top: var(--about-rail-top);
    align-self: start;
    padding-bottom: 0;
    border-bottom: 0;
  }

  .page-about .about-toc {
    flex-direction: column;
    gap: 2px;
    overflow-x: visible;
  }

  .page-about .about-toc a {
    display: flex;
    width: 100%;
    padding: 9px 0;
    border-bottom: 1px solid transparent;
  }

  .page-about .about-toc li + li {
    border-top: 1px solid rgba(23, 92, 73, 0.4);
  }
}

/* ---------- 章节 ---------- */

.page-about .about-chapter {
  padding-block: clamp(44px, 8vw, 108px);
  border-top: var(--about-line);
}

.page-about .about-chapter:first-of-type {
  padding-top: 0;
  border-top: 0;
}

.page-about .about-chapter:last-of-type {
  padding-bottom: 0;
}

.page-about .about-chapter__head {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 8px clamp(16px, 3vw, 34px);
  margin-bottom: clamp(22px, 4vw, 42px);
}

.page-about .about-chapter__num {
  font-family: var(--serif);
  font-size: clamp(58px, 10vw, 124px);
  font-weight: 900;
  line-height: 0.82;
  letter-spacing: -0.05em;
  color: transparent;
  -webkit-text-stroke: 1px var(--ink-500);
  user-select: none;
}

.page-about .about-chapter__titling .kicker {
  margin: 0 0 6px;
}

.page-about .about-chapter__titling .t-h2 {
  margin: 0;
}

.page-about .about-chapter__grid {
  display: grid;
  gap: clamp(20px, 3vw, 34px);
  margin-bottom: clamp(24px, 4vw, 40px);
}

@media (min-width: 780px) {
  .page-about .about-chapter__grid {
    grid-template-columns: minmax(0, 1fr) 218px;
  }
}

.page-about .about-chapter__main p {
  max-width: 62ch;
  margin: 0;
  font-size: 16px;
  line-height: 1.8;
  color: var(--sand);
}

.page-about .about-chapter__main p + p {
  margin-top: 1.05em;
}

.page-about .about-chapter__lede {
  max-width: 62ch;
  margin: 0 0 clamp(22px, 3.2vw, 34px);
  color: var(--sand);
}

/* ---------- 旁注 ---------- */

.page-about .about-note {
  padding-left: 16px;
  border-left: 2px solid var(--blue);
}

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

.page-about .about-note--block {
  max-width: 62ch;
  margin-top: clamp(20px, 3vw, 30px);
}

/* ---------- 图片 ---------- */

.page-about .about-chapter__figure {
  margin: 0 0 clamp(24px, 4vw, 42px);
}

.page-about .about-chapter__figure img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  border: var(--about-line);
  border-radius: var(--radius);
  background: var(--ink-700);
  box-shadow: var(--shadow);
}

.page-about .about-chapter__figure .figure__cap {
  margin-top: 12px;
  font-size: 13px;
  color: var(--stone);
}

/* ---------- 三条能力线 ---------- */

.page-about .about-pillars {
  margin: 0;
  padding: 0;
  list-style: none;
  border-top: var(--about-line);
}

.page-about .about-pillar {
  display: grid;
  gap: 10px;
  padding: clamp(20px, 3vw, 30px) 0;
  border-bottom: var(--about-line);
  transition: background 0.2s ease;
}

.page-about .about-pillar .t-h3 {
  margin: 0 0 8px;
}

.page-about .about-pillar p {
  max-width: 60ch;
  margin: 0;
  font-size: 15px;
  line-height: 1.78;
  color: var(--sand);
}

@media (min-width: 760px) {
  .page-about .about-pillar {
    grid-template-columns: 116px minmax(0, 1fr);
    column-gap: clamp(20px, 3vw, 34px);
    align-items: start;
  }

  .page-about .about-pillar .tag {
    justify-self: start;
  }
}

/* ---------- 团队分工 ---------- */

.page-about .about-cells {
  display: grid;
  gap: clamp(16px, 2.6vw, 26px);
}

@media (min-width: 880px) {
  .page-about .about-cells {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

.page-about .about-cell {
  padding: clamp(18px, 2.4vw, 26px);
  background: var(--ink-700);
  border: var(--about-line);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  transition: transform 0.2s ease, border-color 0.2s ease;
}

.page-about .about-cell:hover,
.page-about .about-cell:focus-visible {
  transform: translateY(-2px);
  border-color: rgba(63, 193, 255, 0.55);
  outline: none;
}

.page-about .about-cell__head {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 12px;
}

.page-about .about-cell__role {
  font-size: 14px;
  letter-spacing: 0.1em;
  color: var(--stone);
}

.page-about .about-cell__count {
  font-family: var(--mono);
  font-size: clamp(30px, 4vw, 40px);
  font-weight: 700;
  line-height: 1;
  letter-spacing: -0.04em;
  color: var(--orange);
  font-variant-numeric: tabular-nums;
}

.page-about .about-cell__unit {
  margin-left: 3px;
  font-size: 13px;
  font-weight: 400;
  color: var(--stone);
}

.page-about .about-cell__track {
  position: relative;
  height: 7px;
  margin: 14px 0 12px;
  border-radius: 999px;
  background: rgba(23, 92, 73, 0.55);
  overflow: hidden;
}

.page-about .about-cell__fill {
  display: block;
  height: 100%;
  border-radius: 999px;
  background: var(--orange);
}

.page-about .about-cell__fill--blue {
  background: var(--blue);
}

.page-about .about-cell__fill--stone {
  background: var(--stone);
}

.page-about .about-cell__desc {
  margin: 0;
  font-size: 14px;
  line-height: 1.75;
  color: var(--sand);
  transition: max-height 0.3s ease, opacity 0.3s ease;
}

@media (hover: hover) and (min-width: 880px) {
  .page-about .about-cell__desc {
    max-height: 0;
    opacity: 0;
    overflow: hidden;
  }

  .page-about .about-cell:hover .about-cell__desc,
  .page-about .about-cell:focus-visible .about-cell__desc,
  .page-about .about-cell:focus-within .about-cell__desc {
    max-height: 9em;
    opacity: 1;
  }
}

/* ---------- 更新节奏 ---------- */

.page-about .about-cadence {
  display: grid;
  gap: 1px;
  background: rgba(23, 92, 73, 0.6);
  border: var(--about-line);
  border-radius: var(--radius);
  overflow: hidden;
}

@media (min-width: 820px) {
  .page-about .about-cadence {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

.page-about .about-beat {
  padding: clamp(20px, 3vw, 32px);
  background: var(--ink-900);
}

.page-about .about-beat__time {
  display: flex;
  align-items: baseline;
  gap: 6px;
  margin: 0 0 14px;
  font-family: var(--mono);
  font-size: clamp(30px, 4.6vw, 44px);
  font-weight: 700;
  line-height: 1;
  letter-spacing: -0.04em;
  color: var(--orange);
  font-variant-numeric: tabular-nums;
}

.page-about .about-beat__unit {
  font-family: var(--sans);
  font-size: 13px;
  font-weight: 400;
  letter-spacing: 0.06em;
  color: var(--stone);
}

.page-about .about-beat .t-h3 {
  margin: 0 0 8px;
}

.page-about .about-beat p:last-child {
  margin: 0;
  font-size: 14px;
  line-height: 1.78;
  color: var(--sand);
}

/* ---------- 时间轴 ---------- */

.page-about .about-timeline {
  margin: clamp(28px, 4vw, 46px) 0 0;
  padding: 0 0 0 clamp(18px, 3vw, 28px);
  list-style: none;
}

.page-about .about-timeline__item {
  position: relative;
  padding-bottom: clamp(24px, 3.4vw, 36px);
  border-left: 1px solid rgba(23, 92, 73, 0.75);
  padding-left: clamp(18px, 3vw, 28px);
  outline: none;
}

.page-about .about-timeline__item:last-child {
  padding-bottom: 0;
}

.page-about .about-timeline__item::before {
  content: "";
  position: absolute;
  left: -6px;
  top: 6px;
  width: 11px;
  height: 11px;
  border-radius: 50%;
  background: var(--ink-900);
  border: 1px solid var(--blue);
  transition: background 0.2s ease, border-color 0.2s ease, transform 0.2s ease;
}

.page-about .about-timeline__item:hover::before,
.page-about .about-timeline__item:focus-visible::before {
  background: var(--orange);
  border-color: var(--orange);
  transform: scale(1.18);
}

.page-about .about-timeline__year {
  display: block;
  margin-bottom: 8px;
  font-family: var(--mono);
  font-size: clamp(20px, 3vw, 26px);
  font-weight: 700;
  letter-spacing: -0.03em;
  color: var(--orange);
  font-variant-numeric: tabular-nums;
}

.page-about .about-timeline__body .t-h3 {
  margin: 0 0 8px;
}

.page-about .about-timeline__body > p {
  max-width: 58ch;
  margin: 0;
  font-size: 15px;
  line-height: 1.78;
  color: var(--sand);
}

.page-about .about-timeline__more {
  margin-top: 8px;
  font-size: 13px;
  line-height: 1.72;
  color: var(--stone);
  transition: max-height 0.32s ease, opacity 0.32s ease;
}

@media (hover: hover) and (min-width: 900px) {
  .page-about .about-timeline__more {
    max-height: 0;
    opacity: 0;
    overflow: hidden;
  }

  .page-about .about-timeline__item:hover .about-timeline__more,
  .page-about .about-timeline__item:focus-visible .about-timeline__more {
    max-height: 7em;
    opacity: 1;
  }
}

/* ---------- 合作 ---------- */

.page-about .about-partners {
  display: grid;
  gap: clamp(22px, 3.4vw, 38px);
  padding: clamp(22px, 3.6vw, 40px);
  background: var(--grad-turf);
  border: var(--about-line);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
}

@media (min-width: 820px) {
  .page-about .about-partners {
    grid-template-columns: 200px minmax(0, 1fr);
    align-items: start;
  }
}

.page-about .about-partners__stats {
  display: grid;
  gap: 14px;
}

.page-about .about-stat {
  display: flex;
  align-items: baseline;
  gap: 10px;
  padding-bottom: 14px;
  border-bottom: var(--about-line);
}

.page-about .about-stat__num {
  font-family: var(--mono);
  font-size: clamp(30px, 4.2vw, 42px);
  font-weight: 700;
  line-height: 1;
  letter-spacing: -0.04em;
  color: var(--orange);
  font-variant-numeric: tabular-nums;
}

.page-about .about-stat__label {
  font-size: 14px;
  color: var(--sand);
}

.page-about .about-partners__main p {
  margin: 0 0 1.05em;
  font-size: 15px;
  line-height: 1.8;
  color: var(--sand);
}

.page-about .about-partners__main .btn {
  margin-top: 6px;
}

/* ---------- 动效收敛 ---------- */

@media (prefers-reduced-motion: reduce) {
  .page-about .about-cell,
  .page-about .about-cell__desc,
  .page-about .about-timeline__item::before,
  .page-about .about-timeline__more,
  .page-about .about-toc a {
    transition: none;
  }

  .page-about .about-cell:hover {
    transform: none;
  }
}
<<<END>>>