.page-about {
  --about-rail-w: 176px;
  --about-sec-gap: clamp(56px, 9vw, 112px);
  padding-bottom: clamp(64px, 10vw, 120px);
}

.page-about .about-wrap {
  width: var(--shell);
  margin-inline: auto;
}

.page-about .crumbs {
  padding-top: clamp(18px, 3vw, 30px);
}

/* ---------- 首屏 ---------- */

.page-about .about-hero {
  display: grid;
  gap: clamp(32px, 5vw, 56px);
  padding-block: clamp(24px, 4vw, 44px) clamp(48px, 7vw, 96px);
}

@media (min-width: 1000px) {
  .page-about .about-hero {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, 0.95fr);
    align-items: center;
    gap: clamp(40px, 5vw, 80px);
  }
}

.page-about .about-hero h1 {
  margin: 16px 0 0;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(34px, 5.4vw, 64px);
  line-height: 1.06;
  letter-spacing: -0.03em;
  color: var(--ink);
}

.page-about .about-hero__lead {
  margin: 22px 0 0;
  max-width: 46ch;
  font-size: clamp(15px, 1.5vw, 17px);
  line-height: 1.78;
  color: var(--ink-dim);
}

.page-about .about-hero__stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin: clamp(28px, 4vw, 40px) 0 0;
  background: var(--line);
  border: 1px solid var(--line);
}

@media (min-width: 620px) {
  .page-about .about-hero__stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

.page-about .about-hero__stats > div {
  background: var(--sky-850);
  padding: 14px 16px;
}

.page-about .about-hero__stats dt {
  margin: 0;
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--ink-dim);
}

.page-about .about-hero__stats dd {
  margin: 6px 0 0;
  font-size: 22px;
  line-height: 1.1;
  color: var(--mint);
  font-variant-numeric: tabular-nums;
}

.page-about .about-hero__stats dd small {
  margin-left: 2px;
  font-size: 13px;
  color: var(--ink-dim);
}

.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: clamp(24px, 3vw, 36px);
}

/* ---------- 主骨架 ---------- */

.page-about .about-body {
  display: grid;
  gap: clamp(32px, 4vw, 48px);
  margin-top: clamp(32px, 5vw, 64px);
}

@media (min-width: 900px) {
  .page-about .about-body {
    grid-template-columns: var(--about-rail-w) minmax(0, 1fr);
    gap: clamp(40px, 5vw, 80px);
    align-items: start;
  }
}

.page-about .about-sections {
  display: grid;
  gap: var(--about-sec-gap);
  min-width: 0;
}

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

/* ---------- 左侧章节索引 ---------- */

.page-about .about-rail {
  position: sticky;
  top: calc(var(--header-h) + 28px);
  align-self: start;
}

.page-about .about-rail__label {
  margin: 0 0 14px;
  padding-left: 14px;
  font-size: 11px;
  letter-spacing: 0.18em;
  color: var(--ink-dim);
}

.page-about .about-rail__list {
  list-style: none;
  margin: 0;
  padding: 0;
  border-left: 1px solid var(--line);
}

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

.page-about .about-rail__link {
  position: relative;
  display: flex;
  align-items: baseline;
  gap: 10px;
  padding: 9px 0 9px 14px;
  font-size: 14px;
  line-height: 1.5;
  color: var(--ink-dim);
  text-decoration: none;
  transition: color 200ms var(--ease);
}

.page-about .about-rail__link::before {
  content: "";
  position: absolute;
  left: -1px;
  top: 50%;
  width: 0;
  height: 16px;
  transform: translateY(-50%);
  background: var(--mint);
  transition: width 200ms var(--ease);
}

.page-about .about-rail__link:hover,
.page-about .about-rail__link:focus-visible {
  color: var(--ink);
}

.page-about .about-rail__link[aria-current] {
  color: var(--ink);
}

.page-about .about-rail__link[aria-current]::before {
  width: 12px;
}

.page-about .about-rail__num {
  flex: 0 0 auto;
  font-size: 11px;
  letter-spacing: 0.08em;
  color: var(--mint);
}

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

@media (max-width: 899px) {
  .page-about .about-rail {
    position: static;
    top: auto;
  }

  .page-about .about-rail__label {
    padding-left: 0;
  }

  .page-about .about-rail__list {
    display: flex;
    gap: 8px;
    padding: 0 0 12px;
    border-left: 0;
    border-bottom: 1px solid var(--line);
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
  }

  .page-about .about-rail__item {
    flex: 0 0 auto;
  }

  .page-about .about-rail__link {
    padding: 8px 13px;
    border: 1px solid var(--line);
    background: var(--sky-850);
    font-size: 13px;
    white-space: nowrap;
  }

  .page-about .about-rail__link::before {
    display: none;
  }

  .page-about .about-rail__link[aria-current] {
    border-color: var(--mint-mid);
  }
}

/* ---------- 章节抬头 ---------- */

.page-about .about-sec__head {
  display: flex;
  align-items: baseline;
  gap: 14px;
  padding-bottom: 16px;
  margin-bottom: clamp(22px, 3vw, 34px);
  border-bottom: 1px solid var(--line);
}

.page-about .about-sec__num {
  flex: 0 0 auto;
  margin: 0;
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--mint);
}

.page-about .about-sec__title {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(24px, 2.6vw, 34px);
  line-height: 1.2;
  letter-spacing: -0.02em;
  color: var(--ink);
}

.page-about .about-sec__lead {
  margin: 0 0 clamp(20px, 3vw, 32px);
  max-width: 62ch;
  font-size: 16px;
  line-height: 1.78;
  color: var(--ink-dim);
}

/* ---------- 01 受众 ---------- */

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

@media (min-width: 760px) {
  .page-about .about-audience {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

.page-about .about-audience__item {
  background: var(--sky-850);
  border: 1px solid var(--line);
  border-left: 2px solid var(--line);
  padding: clamp(20px, 2.4vw, 28px);
  transition: border-color 240ms var(--ease), background 240ms var(--ease);
}

.page-about .about-audience__item:hover {
  border-left-color: var(--mint);
  background: var(--sky-800);
}

.page-about .about-audience__kicker {
  margin: 0;
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--ink-dim);
}

.page-about .about-audience__name {
  margin: 12px 0 10px;
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 20px;
  line-height: 1.3;
  letter-spacing: -0.01em;
  color: var(--ink);
}

.page-about .about-audience__text {
  margin: 0;
  font-size: 15px;
  line-height: 1.75;
  color: var(--ink-dim);
}

/* ---------- 02 数据来源 ---------- */

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

.page-about .about-source__item {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  column-gap: 16px;
  row-gap: 8px;
  padding: clamp(18px, 2.4vw, 26px) 0;
  border-bottom: 1px solid var(--line);
}

.page-about .about-source__idx {
  grid-column: 1;
  padding-top: 3px;
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--mint);
}

.page-about .about-source__name {
  grid-column: 2;
  margin: 0;
  font-size: 17px;
  font-weight: 600;
  line-height: 1.4;
  color: var(--ink);
}

.page-about .about-source__item p {
  grid-column: 2;
  margin: 0;
  max-width: 58ch;
  font-size: 15px;
  line-height: 1.75;
  color: var(--ink-dim);
}

@media (min-width: 720px) {
  .page-about .about-source__item {
    grid-template-columns: 56px minmax(0, 200px) minmax(0, 1fr);
    column-gap: clamp(20px, 3vw, 40px);
    align-items: baseline;
  }

  .page-about .about-source__item p {
    grid-column: 3;
  }
}

.page-about .about-source__panel {
  margin-top: clamp(24px, 3vw, 36px);
  padding: clamp(20px, 2.6vw, 30px);
  background: var(--mint-soft);
  border: 1px solid var(--mint-mid);
  border-left: 2px solid var(--mint);
}

.page-about .about-source__panel-label {
  margin: 0 0 10px;
  font-size: 12px;
  letter-spacing: 0.12em;
  color: var(--mint);
}

.page-about .about-source__panel-text {
  margin: 0;
  max-width: 62ch;
  font-size: 16px;
  line-height: 1.78;
  color: var(--ink);
}

/* ---------- 03 内容流程 ---------- */

.page-about .about-flow {
  list-style: none;
  position: relative;
  display: grid;
  gap: clamp(22px, 3vw, 32px);
  margin: 0;
  padding: 0 0 0 28px;
}

.page-about .about-flow::before {
  content: "";
  position: absolute;
  left: 4px;
  top: 8px;
  bottom: 8px;
  width: 1px;
  background: linear-gradient(180deg, var(--mint-mid), var(--line) 72%, transparent);
}

.page-about .about-flow__step {
  position: relative;
}

.page-about .about-flow__dot {
  position: absolute;
  left: -28px;
  top: 6px;
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--mint);
}

.page-about .about-flow__step--key .about-flow__dot {
  background: var(--pulse);
  box-shadow: 0 0 0 4px rgba(255, 122, 43, 0.16);
}

.page-about .about-flow__time {
  margin: 0 0 6px;
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--mint);
}

.page-about .about-flow__step--key .about-flow__time {
  color: var(--pulse);
}

.page-about .about-flow__name {
  margin: 0 0 6px;
  font-size: clamp(17px, 1.8vw, 20px);
  font-weight: 600;
  line-height: 1.4;
  color: var(--ink);
}

.page-about .about-flow__text {
  margin: 0;
  max-width: 58ch;
  font-size: 15px;
  line-height: 1.75;
  color: var(--ink-dim);
}

/* ---------- 04 团队 ---------- */

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

@media (min-width: 700px) {
  .page-about .about-team {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

.page-about .about-team__row {
  background: var(--sky-850);
  padding: clamp(20px, 2.6vw, 30px);
}

.page-about .about-team__name {
  margin: 0 0 10px;
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 19px;
  line-height: 1.3;
  letter-spacing: -0.01em;
  color: var(--ink);
}

.page-about .about-team__name::before {
  content: "";
  display: inline-block;
  width: 10px;
  height: 2px;
  margin-right: 10px;
  vertical-align: middle;
  background: var(--mint);
}

.page-about .about-team__text {
  margin: 0;
  font-size: 15px;
  line-height: 1.75;
  color: var(--ink-dim);
}

/* ---------- 05 规模 ---------- */

.page-about .about-scale {
  list-style: none;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 14px;
  margin: 0;
  padding: 0;
}

@media (min-width: 900px) {
  .page-about .about-scale {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

.page-about .about-scale__card {
  position: relative;
  overflow: hidden;
  padding: clamp(18px, 2.2vw, 26px);
  background: linear-gradient(160deg, var(--sky-800), var(--sky-900));
  border: 1px solid var(--line);
}

.page-about .about-scale__card::after {
  content: "";
  position: absolute;
  right: -30px;
  bottom: -30px;
  width: 96px;
  height: 96px;
  border-radius: 50%;
  background: radial-gradient(circle, var(--mint-soft), transparent 70%);
  pointer-events: none;
}

.page-about .about-scale__value {
  margin: 0;
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: clamp(30px, 3.6vw, 44px);
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--mint);
}

.page-about .about-scale__value small {
  margin-left: 2px;
  font-size: 15px;
  color: var(--ink-dim);
}

.page-about .about-scale__label {
  margin: 12px 0 6px;
  font-size: 15px;
  font-weight: 600;
  color: var(--ink);
}

.page-about .about-scale__note {
  margin: 0;
  font-size: 13px;
  line-height: 1.65;
  color: var(--ink-dim);
}

/* ---------- 06 版本时间线 ---------- */

.page-about .about-timeline {
  list-style: none;
  position: relative;
  margin: 0;
  padding: 0 0 0 26px;
}

.page-about .about-timeline::before {
  content: "";
  position: absolute;
  left: 4px;
  top: 6px;
  bottom: 6px;
  width: 1px;
  background: linear-gradient(180deg, var(--mint-mid), var(--line));
}

.page-about .about-timeline__item {
  position: relative;
  padding-bottom: clamp(28px, 4vw, 44px);
}

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

.page-about .about-timeline__node {
  position: absolute;
  left: -26px;
  top: 6px;
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--mint);
}

.page-about .about-timeline__year {
  margin: 0;
  font-size: 13px;
  letter-spacing: 0.14em;
  color: var(--ink-dim);
}

.page-about .about-timeline__ver {
  margin: 4px 0 0;
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: 26px;
  font-weight: 700;
  line-height: 1;
  letter-spacing: 0.02em;
  color: var(--mint);
}

.page-about .about-timeline__title {
  margin: 10px 0 6px;
  font-family: var(--font-display);
  font-weight: 600;
  font-size: clamp(18px, 2vw, 22px);
  line-height: 1.3;
  letter-spacing: -0.01em;
  color: var(--ink);
}

.page-about .about-timeline__text {
  margin: 0;
  max-width: 58ch;
  font-size: 15px;
  line-height: 1.75;
  color: var(--ink-dim);
}

/* ---------- 07 准则与合作 ---------- */

.page-about .about-principles {
  display: grid;
  gap: 16px;
}

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

.page-about .about-principles__card {
  display: flex;
  flex-direction: column;
  padding: clamp(20px, 2.6vw, 30px);
  background: var(--sky-850);
  border: 1px solid var(--line);
  border-top: 2px solid var(--mint-deep);
}

.page-about .about-principles__kicker {
  margin: 0 0 12px;
  font-size: 12px;
  letter-spacing: 0.12em;
  color: var(--amber);
}

.page-about .about-principles__card h3 {
  margin: 0 0 10px;
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 19px;
  line-height: 1.35;
  letter-spacing: -0.01em;
  color: var(--ink);
}

.page-about .about-principles__card p {
  margin: 0;
  font-size: 15px;
  line-height: 1.78;
  color: var(--ink-dim);
}

.page-about .about-principles__link {
  align-self: flex-start;
  margin-top: auto;
  padding-top: 18px;
  font-size: 14px;
  color: var(--mint);
  text-decoration: none;
  transition: color 200ms var(--ease);
}

.page-about .about-principles__link:hover,
.page-about .about-principles__link:focus-visible {
  color: var(--ink);
}

/* ---------- 收尾 ---------- */

.page-about .about-cta {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 18px 28px;
  margin-top: clamp(28px, 4vw, 44px);
  padding: clamp(22px, 3vw, 34px);
  background: linear-gradient(120deg, var(--sky-850), var(--sky-900));
  border: 1px solid var(--line);
  border-left: 3px solid var(--mint);
}

.page-about .about-cta__text {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 600;
  font-size: clamp(16px, 1.8vw, 19px);
  line-height: 1.4;
  letter-spacing: -0.01em;
  color: var(--ink);
}

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

/* ---------- 图片 ---------- */

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

.page-about figure.media figcaption {
  margin-top: 10px;
  font-size: 13px;
  line-height: 1.65;
  color: var(--ink-dim);
}

.page-about .about-hero__figure .media__img,
.page-about .about-flow__figure .media__img,
.page-about .about-scale__figure .media__img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
  border: 1px solid var(--line);
}

.page-about .about-flow__figure,
.page-about .about-scale__figure {
  margin: clamp(28px, 4vw, 44px) 0 0;
}

/* ---------- 入场 ---------- */

.page-about [data-reveal] {
  opacity: 0;
  transform: translateY(16px);
  transition: opacity 240ms var(--ease), transform 240ms var(--ease);
}

.page-about [data-reveal="in"] {
  opacity: 1;
  transform: none;
}

@media (prefers-reduced-motion: reduce) {
  .page-about [data-reveal] {
    opacity: 1;
    transform: none;
    transition: none;
  }

  .page-about .about-flow__dot,
  .page-about .about-rail__link::before {
    transition: none;
  }
}

@media (scripting: none) {
  .page-about [data-reveal] {
    opacity: 1;
    transform: none;
  }
}

/* ---------- 焦点环 ---------- */

.page-about a:focus-visible {
  outline: 2px solid var(--mint);
  outline-offset: 3px;
}
<<<END>>>