.page-about {
  --about-line: rgba(29, 106, 130, 0.42);
  --about-line-soft: rgba(29, 106, 130, 0.24);
  --about-ink: rgba(234, 242, 247, 0.88);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  padding: clamp(20px, 3vw, 34px) 0 clamp(38px, 5vw, 66px);
  border-bottom: 1px solid var(--about-line-soft);
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: -1px;
  height: 3px;
  background: linear-gradient(90deg, var(--green) 0%, var(--tide) 34%, rgba(29, 106, 130, 0) 82%);
  opacity: 0.55;
}

.page-about .about-hero__grid {
  row-gap: 32px;
  align-items: start;
}

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

.page-about .about-hero__eyebrow {
  margin: 18px 0 14px;
  font-family: var(--font-mono);
  font-size: 12.5px;
  letter-spacing: 0.08em;
  color: var(--green);
}

.page-about .about-hero h1 {
  margin: 0 0 18px;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(2.6rem, 8vw, 4.8rem);
  line-height: 0.96;
  letter-spacing: -0.02em;
  color: var(--paper);
}

.page-about .about-hero__lead {
  margin: 0 0 16px;
  max-width: 44ch;
  font-size: clamp(1.05rem, 2.2vw, 1.28rem);
  line-height: 1.62;
  color: var(--paper);
}

.page-about .about-hero__body {
  margin: 0;
  max-width: 56ch;
  font-size: 17px;
  line-height: 1.82;
  color: var(--about-ink);
}

/* 首屏概览数据 */
.page-about .about-hero__meta {
  min-width: 0;
}

.page-about .about-meta {
  margin: 0;
  padding: 4px 16px;
  border-top: 2px solid var(--green);
  background: linear-gradient(180deg, rgba(18, 50, 70, 0.78), rgba(10, 34, 51, 0.34));
}

.page-about .about-meta__row {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 12px;
  padding: 12px 0;
  border-bottom: 1px solid var(--about-line-soft);
}

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

.page-about .about-meta dt {
  font-size: 13.5px;
  color: var(--mist);
  line-height: 1.5;
}

.page-about .about-meta dd {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 15px;
  color: var(--paper);
  white-space: nowrap;
}

.page-about .about-meta__num {
  font-size: 20px;
  color: var(--amber);
}

/* ---------- 主体：左文右注 ---------- */
.page-about .about-body {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 52px 0;
  padding-top: clamp(40px, 5vw, 68px);
}

.page-about .about-body__main {
  display: grid;
  gap: clamp(58px, 7vw, 100px);
  min-width: 0;
}

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

/* ---------- 章节头 ---------- */
.page-about .section-head {
  margin: 0 0 26px;
  padding: 0;
}

.page-about .section-head__num {
  margin: 0 0 10px;
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.14em;
  color: var(--amber);
}

.page-about .section-head__title {
  margin: 0 0 10px;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(1.55rem, 3.6vw, 2.35rem);
  line-height: 1.16;
  letter-spacing: -0.01em;
  color: var(--paper);
}

.page-about .section-head__lede {
  margin: 0;
  max-width: 56ch;
  font-size: 16px;
  line-height: 1.78;
  color: var(--mist);
}

/* ---------- 正文段落 ---------- */
.page-about .about-prose p {
  margin: 0 0 15px;
  max-width: 62ch;
  font-size: 17px;
  line-height: 1.84;
  color: var(--about-ink);
}

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

/* ---------- 配图 ---------- */
.page-about .about-figure {
  margin: 30px 0 0;
}

.page-about .about-figure img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
  border: 1px solid var(--about-line-soft);
  background: var(--navy-800);
}

.page-about .about-figure__cap {
  margin: 10px 0 0;
  font-family: var(--font-mono);
  font-size: 12.5px;
  line-height: 1.66;
  color: var(--mist-dim);
}

.page-about .about-figure--wide {
  margin-top: 0;
  margin-bottom: 30px;
}

/* ---------- 02 看台三层 ---------- */
.page-about .about-method {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 14px;
}

.page-about .about-method__item {
  padding: 20px 22px 22px;
  border-left: 3px solid var(--tide);
  background: linear-gradient(100deg, rgba(18, 50, 70, 0.86) 0%, rgba(10, 34, 51, 0.55) 100%);
}

.page-about .about-method__item:nth-child(2) {
  border-left-color: var(--amber);
}

.page-about .about-method__item:nth-child(3) {
  border-left-color: var(--green);
}

.page-about .about-method__idx {
  margin: 0 0 8px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.12em;
  color: var(--mist);
}

.page-about .about-method__title {
  margin: 0 0 8px;
  font-size: 18px;
  line-height: 1.4;
  color: var(--paper);
}

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

/* ---------- 03 团队 ---------- */
.page-about .about-team {
  display: grid;
  gap: 0;
}

.page-about .about-team__card {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 10px;
  padding: 22px 0;
  border-top: 1px solid var(--about-line-soft);
}

.page-about .about-team__card:last-child {
  border-bottom: 1px solid var(--about-line-soft);
}

.page-about .about-team__count {
  margin: 0;
  font-size: 13px;
  color: var(--mist);
}

.page-about .about-team__count b {
  display: block;
  font-family: var(--font-mono);
  font-size: 40px;
  line-height: 1;
  color: var(--amber);
  margin-bottom: 4px;
}

.page-about .about-team__name {
  margin: 0 0 8px;
  font-size: 19px;
  color: var(--paper);
}

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

/* ---------- 04 流程 ---------- */
.page-about .about-flow {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 18px;
}

.page-about .about-flow__step {
  position: relative;
  padding: 16px 0 0;
  border-top: 2px solid var(--tide);
}

.page-about .about-flow__step:nth-child(2) {
  border-top-color: var(--green-deep);
}

.page-about .about-flow__step:nth-child(3) {
  border-top-color: var(--amber-deep);
}

.page-about .about-flow__step:nth-child(4) {
  border-top-color: var(--green);
}

.page-about .about-flow__no {
  margin: 0 0 6px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.12em;
  color: var(--amber);
}

.page-about .about-flow__name {
  margin: 0 0 8px;
  font-size: 17px;
  color: var(--paper);
}

.page-about .about-flow__text {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.74;
  color: var(--mist);
}

/* ---------- 05 时间轴 ---------- */
.page-about .about-timeline {
  list-style: none;
  margin: 0;
  padding: 0 0 0 34px;
  position: relative;
}

.page-about .about-timeline::before {
  content: "";
  position: absolute;
  left: 6px;
  top: 8px;
  bottom: 8px;
  width: 2px;
  background: linear-gradient(180deg, var(--navy-700) 0%, var(--indigo) 54%, var(--green) 100%);
}

.page-about .about-timeline__node {
  position: relative;
  padding: 0 0 34px;
}

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

.page-about .about-timeline__node::before {
  content: "";
  position: absolute;
  left: -34px;
  top: 6px;
  width: 14px;
  height: 14px;
  border-radius: 50%;
  background: var(--navy-950);
  border: 2px solid var(--tide);
  transition: border-color 160ms var(--ease), background-color 160ms var(--ease);
}

.page-about .about-timeline__node[data-in-view]::before {
  border-color: var(--green);
  background: var(--green-deep);
  box-shadow: 0 0 0 4px rgba(53, 224, 138, 0.14);
}

.page-about .about-timeline__year {
  margin: 0 0 6px;
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.05em;
  color: var(--amber);
}

.page-about .about-timeline__title {
  margin: 0 0 8px;
  font-size: 19px;
  line-height: 1.4;
  color: var(--paper);
}

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

/* ---------- 06 素材与合作 ---------- */
.page-about .about-partners {
  list-style: none;
  margin: 0;
  padding: 0;
}

.page-about .about-partners__item {
  position: relative;
  padding: 18px 0 18px 22px;
  border-top: 1px solid var(--about-line-soft);
}

.page-about .about-partners__item:last-child {
  border-bottom: 1px solid var(--about-line-soft);
}

.page-about .about-partners__item::before {
  content: "";
  position: absolute;
  left: 0;
  top: 25px;
  width: 8px;
  height: 8px;
  background: var(--tide);
  transform: rotate(45deg);
}

.page-about .about-partners__name {
  margin: 0 0 6px;
  font-size: 16.5px;
  color: var(--paper);
}

.page-about .about-partners__text {
  margin: 0;
  max-width: 58ch;
  font-size: 15px;
  line-height: 1.76;
  color: var(--mist);
}

/* ---------- 07 收束 ---------- */
.page-about .about-principles {
  list-style: none;
  counter-reset: about-p;
  margin: 0 0 34px;
  padding: 0;
}

.page-about .about-principles li {
  counter-increment: about-p;
  position: relative;
  padding: 16px 0 16px 44px;
  border-bottom: 1px solid var(--about-line-soft);
  font-size: 16px;
  line-height: 1.76;
  color: var(--paper);
}

.page-about .about-principles li:first-child {
  border-top: 1px solid var(--about-line-soft);
}

.page-about .about-principles li::before {
  content: counter(about-p, decimal-leading-zero);
  position: absolute;
  left: 0;
  top: 17px;
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--green);
}

.page-about .about-next__note {
  margin: 0 0 20px;
  max-width: 62ch;
  font-size: 15.5px;
  line-height: 1.8;
  color: var(--mist);
}

.page-about .about-next__note a {
  color: var(--green);
  text-decoration: none;
  border-bottom: 1px solid rgba(53, 224, 138, 0.34);
  transition: border-color 160ms var(--ease), color 160ms var(--ease);
}

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

.page-about .about-next__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin: 0;
}

/* ---------- 侧栏速览 ---------- */
.page-about .about-side {
  padding: 20px 18px 22px;
  border: 1px solid var(--about-line);
  background: linear-gradient(165deg, rgba(18, 50, 70, 0.86), rgba(5, 19, 31, 0.94));
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 16px), calc(100% - 16px) 100%, 0 100%);
}

.page-about .about-side__title {
  margin: 0 0 14px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--green);
}

.page-about .about-side__stats {
  list-style: none;
  margin: 0 0 18px;
  padding: 0;
}

.page-about .about-side__stats li {
  padding: 12px 0;
  border-top: 1px solid var(--about-line-soft);
}

.page-about .about-side__num {
  display: block;
  font-family: var(--font-mono);
  font-size: 26px;
  line-height: 1.1;
  color: var(--amber);
}

.page-about .about-side__lbl {
  display: block;
  margin-top: 3px;
  font-size: 12.5px;
  line-height: 1.5;
  color: var(--mist);
}

.page-about .about-side__nav {
  display: grid;
}

.page-about .about-side__nav a {
  display: block;
  padding: 9px 0;
  border-top: 1px solid var(--about-line-soft);
  font-size: 13.5px;
  line-height: 1.55;
  color: var(--mist);
  text-decoration: none;
  transition: color 160ms var(--ease), padding-left 160ms var(--ease);
}

.page-about .about-side__nav a:hover {
  color: var(--green);
  padding-left: 6px;
}

/* ---------- 焦点可见 ---------- */
.page-about a:focus-visible {
  outline: 2px solid var(--green);
  outline-offset: 2px;
}

/* ---------- 平板 ---------- */
@media (min-width: 720px) {
  .page-about .about-team__card {
    grid-template-columns: 96px minmax(0, 1fr);
    gap: 22px;
    align-items: start;
  }

  .page-about .about-team__count b {
    font-size: 44px;
  }
}

@media (min-width: 860px) {
  .page-about .about-flow {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 20px;
  }

  .page-about .about-flow__step:not(:last-child)::after {
    content: "";
    position: absolute;
    top: 22px;
    right: -5px;
    width: 8px;
    height: 8px;
    border-top: 1px solid var(--green);
    border-right: 1px solid var(--green);
    transform: rotate(45deg);
  }
}

@media (min-width: 980px) {
  .page-about .about-hero__meta {
    grid-column: 9 / span 4;
  }

  .page-about .about-hero__grid {
    row-gap: 0;
  }
}

/* ---------- 桌面：左侧正文 + 右侧粘性旁注 ---------- */
@media (min-width: 1024px) {
  .page-about .about-body {
    grid-template-columns: 7fr 1fr 4fr;
    gap: 0;
  }

  .page-about .about-body__main {
    grid-column: 1 / 2;
    padding-right: 8px;
  }

  .page-about .about-body__side {
    grid-column: 3 / 4;
    align-self: start;
    position: sticky;
    top: calc(var(--head-h) + 32px);
  }
}

/* ---------- 降级动效 ---------- */
@media (prefers-reduced-motion: reduce) {
  .page-about .about-timeline__node::before,
  .page-about .about-side__nav a,
  .page-about .about-next__note a {
    transition: none;
  }
}
<<<END>>>