.page-about {
  background: var(--sand-50);
  color: var(--ink-black);
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.8;
  letter-spacing: .01em;
  overflow-x: hidden;
}

.page-about .about-wrap {
  max-width: 900px;
  margin: 0 auto;
  padding: 30px 20px 48px;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  padding-bottom: 6px;
}

.page-about .about-hero .eyebrow {
  margin: 20px 0 12px;
  color: var(--clay-700);
  font-size: 12px;
  letter-spacing: .16em;
}

.page-about .about-hero h1 {
  margin: 0 0 18px;
  font-family: var(--font-display);
  font-weight: 300;
  font-size: 40px;
  line-height: 1.1;
  letter-spacing: -.025em;
  color: var(--ink-900);
}

.page-about .about-hero__lede {
  margin: 0 0 26px;
  font-size: 17px;
  line-height: 1.78;
  color: var(--ink-700);
}

.page-about .about-jump {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  padding-bottom: 26px;
  border-bottom: var(--stroke-soft);
}

.page-about .about-jump a {
  display: inline-block;
  padding: 7px 15px;
  border-radius: var(--radius-pill);
  border: var(--stroke);
  background: var(--paper);
  color: var(--ink-700);
  font-size: 13px;
  letter-spacing: .03em;
  text-decoration: none;
  transition: background var(--dur) var(--ease),
              color var(--dur) var(--ease),
              border-color var(--dur) var(--ease);
}

.page-about .about-jump a:hover,
.page-about .about-jump a:focus-visible {
  background: var(--ink-900);
  border-color: var(--ink-900);
  color: var(--sand-50);
  outline: none;
}

/* ---------- 章节主体与脊柱刻度 ---------- */
.page-about .about-body {
  position: relative;
}

.page-about .about-chapter {
  position: relative;
  display: grid;
  grid-template-columns: 1fr;
  gap: 10px;
  padding: 38px 0;
  scroll-margin-top: 96px;
}

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

.page-about .about-chapter__num {
  display: inline-block;
  font-size: 12px;
  letter-spacing: .18em;
  color: var(--mist-600);
  background: var(--sand-50);
  padding: 2px 8px;
  border-radius: var(--radius-pill);
  border: var(--stroke-soft);
}

.page-about .about-chapter__title {
  margin: 0 0 16px;
  font-family: var(--font-display);
  font-weight: 400;
  font-size: 27px;
  line-height: 1.3;
  letter-spacing: -.01em;
  color: var(--ink-900);
}

.page-about .about-chapter__title::after {
  content: "";
  display: block;
  width: 34px;
  height: 2px;
  margin-top: 14px;
  border-radius: 2px;
  background: var(--clay-500);
}

.page-about .about-chapter__body p {
  margin: 0 0 16px;
}

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

.page-about .about-chapter__body a {
  color: var(--ink-500);
  text-decoration: underline;
  text-decoration-thickness: 1px;
  text-underline-offset: 3px;
  transition: color var(--dur) var(--ease);
}

.page-about .about-chapter__body a:hover,
.page-about .about-chapter__body a:focus-visible {
  color: var(--clay-700);
}

/* ---------- 图片 ---------- */
.page-about .about-figure {
  margin: 0 0 20px;
  border-radius: 18px;
  overflow: hidden;
  background: var(--sand-200);
}

.page-about .about-figure img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
  border-radius: 18px;
}

.page-about .about-figure .media__caption {
  margin: 0;
  padding: 10px 14px;
  font-size: 12px;
  line-height: 1.65;
  color: var(--mist-600);
  background: var(--sand-200);
}

.page-about .about-figure--float {
  width: 100%;
}

.page-about .about-figure--band {
  margin: 8px 0 36px;
  border-radius: 22px;
}

.page-about .about-figure--band img {
  border-radius: 22px;
}

/* ---------- 主张底纹块 ---------- */
.page-about .about-creed {
  margin: 24px 0 26px;
  padding: 26px 22px;
  border-radius: var(--radius-card);
  background:
    radial-gradient(120% 140% at 0% 0%, rgba(240, 201, 168, .55), transparent 62%),
    var(--sand-200);
}

.page-about .about-creed p {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 300;
  font-size: 26px;
  line-height: 1.38;
  letter-spacing: -.02em;
  color: var(--ink-900);
}

/* ---------- 引用块 ---------- */
.page-about .about-quote {
  margin: 26px 0 4px;
  padding: 18px 20px;
  background: var(--paper);
  border-left: 3px solid var(--clay-500);
  border-radius: 0 16px 16px 0;
  box-shadow: var(--shadow-card);
}

.page-about .about-quote p {
  margin: 0;
  font-size: 16px;
  line-height: 1.75;
  color: var(--ink-700);
}

/* ---------- 四个动作流程条 ---------- */
.page-about .about-flow {
  list-style: none;
  margin: 24px 0 24px;
  padding: 0;
  display: grid;
  grid-template-columns: 1fr;
  gap: 12px;
}

.page-about .about-flow__item {
  position: relative;
  padding: 18px 18px 16px;
  border-radius: 18px;
  background: var(--paper);
  border: 1px solid rgba(15, 43, 36, .12);
  transition: border-color var(--dur) var(--ease),
              transform var(--dur) var(--ease),
              box-shadow var(--dur) var(--ease),
              background var(--dur) var(--ease);
}

.page-about .about-flow__item:hover,
.page-about .about-flow__item:focus-within {
  border-color: var(--ink-500);
  transform: translateY(-2px);
  box-shadow: var(--shadow-card);
  background: var(--paper);
}

.page-about .about-flow__idx {
  display: inline-block;
  margin-bottom: 8px;
  font-size: 11px;
  letter-spacing: .16em;
  color: var(--clay-500);
}

.page-about .about-flow__name {
  margin: 0 0 8px;
  font-family: var(--font-display);
  font-weight: 500;
  font-size: 17px;
  letter-spacing: .02em;
  color: var(--ink-900);
  transition: color var(--dur) var(--ease);
}

.page-about .about-flow__item:hover .about-flow__name,
.page-about .about-flow__item:focus-within .about-flow__name {
  color: var(--clay-700);
}

.page-about .about-flow__desc {
  margin: 0 0 10px;
  font-size: 13px;
  line-height: 1.7;
  color: var(--mist-600);
  transition: color var(--dur) var(--ease);
}

.page-about .about-flow__item:hover .about-flow__desc,
.page-about .about-flow__item:focus-within .about-flow__desc {
  color: var(--ink-black);
}

.page-about .about-flow__out {
  margin: 0;
  padding-top: 10px;
  border-top: 1px dashed rgba(15, 43, 36, .16);
  font-size: 12px;
  line-height: 1.6;
  letter-spacing: .02em;
  color: var(--ink-500);
}

/* ---------- 团队 ---------- */
.page-about .about-team {
  display: grid;
  grid-template-columns: 1fr;
  gap: 12px;
  margin: 22px 0 24px;
}

.page-about .about-team__role {
  padding: 18px 18px 16px;
  border-radius: 18px;
  background: var(--sand-200);
}

.page-about .about-team__name {
  margin: 0 0 4px;
  font-family: var(--font-display);
  font-weight: 500;
  font-size: 16px;
  letter-spacing: .04em;
  color: var(--ink-900);
}

.page-about .about-team__count {
  margin: 0 0 10px;
  font-size: 26px;
  font-weight: 500;
  line-height: 1.1;
  color: var(--clay-700);
}

.page-about .about-team__desc {
  margin: 0;
  font-size: 13px;
  line-height: 1.72;
  color: var(--ink-700);
}

/* ---------- 规模数字 ---------- */
.page-about .about-stats {
  margin: 24px 0 24px;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: rgba(15, 43, 36, .14);
  border-radius: 20px;
  overflow: hidden;
}

.page-about .about-stats__item {
  padding: 16px 14px;
  background: var(--sand-50);
}

.page-about .about-stats dt {
  margin-bottom: 6px;
  font-size: 12px;
  letter-spacing: .1em;
  color: var(--mist-600);
}

.page-about .about-stats dd {
  margin: 0;
  display: flex;
  align-items: baseline;
  flex-wrap: wrap;
  gap: 4px;
}

.page-about .about-stats__num {
  font-size: 26px;
  font-weight: 500;
  line-height: 1.05;
  letter-spacing: -.01em;
  color: var(--ink-900);
  font-variant-numeric: tabular-nums;
}

.page-about .about-stats__unit {
  font-size: 12px;
  color: var(--mist-600);
}

/* ---------- 合作生态 ---------- */
.page-about .about-pair {
  display: grid;
  grid-template-columns: 1fr;
  gap: 12px;
  margin: 22px 0 24px;
}

.page-about .about-pair__item {
  padding: 20px 18px;
  border-radius: 18px;
  background: var(--paper);
  border: var(--stroke-soft);
  box-shadow: var(--shadow-card);
}

.page-about .about-pair__item h3 {
  margin: 0 0 8px;
  font-family: var(--font-display);
  font-weight: 500;
  font-size: 16px;
  letter-spacing: .04em;
  color: var(--ink-900);
}

.page-about .about-pair__item h3::before {
  content: "";
  display: inline-block;
  width: 7px;
  height: 7px;
  margin-right: 8px;
  border-radius: 50%;
  background: var(--clay-500);
  vertical-align: 2px;
}

.page-about .about-pair__item p {
  margin: 0;
  font-size: 14px;
  line-height: 1.75;
  color: var(--ink-700);
}

/* ---------- 成长阶段 ---------- */
.page-about .about-stages {
  display: grid;
  gap: 10px;
  margin: 22px 0 8px;
}

.page-about .about-stage {
  border-radius: 16px;
}

.page-about .about-stage summary {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 6px 12px;
  padding: 14px 16px;
  border-radius: 16px;
  background: var(--paper);
  border: 1px solid rgba(15, 43, 36, .12);
  cursor: pointer;
  list-style: none;
  transition: background var(--dur) var(--ease),
              border-color var(--dur) var(--ease);
}

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

.page-about .about-stage summary:hover {
  border-color: var(--ink-500);
}

.page-about .about-stage summary:focus-visible {
  outline: 2px solid var(--ink-500);
  outline-offset: 2px;
}

.page-about .about-stage[open] summary {
  background: var(--sand-200);
  border-color: var(--ink-500);
  border-bottom-left-radius: 0;
  border-bottom-right-radius: 0;
}

.page-about .about-stage__label {
  font-size: 11px;
  letter-spacing: .14em;
  color: var(--clay-700);
}

.page-about .about-stage__name {
  font-family: var(--font-display);
  font-weight: 500;
  font-size: 15px;
  letter-spacing: .02em;
  color: var(--ink-900);
}

.page-about .about-stage__hint {
  margin-left: auto;
  width: 16px;
  height: 16px;
  position: relative;
  flex: 0 0 auto;
}

.page-about .about-stage__hint::before,
.page-about .about-stage__hint::after {
  content: "";
  position: absolute;
  left: 50%;
  top: 50%;
  background: var(--ink-500);
  border-radius: 1px;
  transition: transform var(--dur) var(--ease),
              opacity var(--dur) var(--ease);
}

.page-about .about-stage__hint::before {
  width: 10px;
  height: 1.5px;
  transform: translate(-50%, -50%);
}

.page-about .about-stage__hint::after {
  width: 1.5px;
  height: 10px;
  transform: translate(-50%, -50%);
}

.page-about .about-stage[open] .about-stage__hint::after {
  transform: translate(-50%, -50%) scaleY(0);
  opacity: 0;
}

.page-about .about-stage__body {
  padding: 14px 16px 16px;
  border: 1px solid rgba(15, 43, 36, .12);
  border-top: none;
  border-radius: 0 0 16px 16px;
  background: var(--paper);
}

.page-about .about-stage__body p {
  margin: 0;
  font-size: 14px;
  line-height: 1.78;
  color: var(--ink-700);
}

/* ---------- 尾部转化 ---------- */
.page-about .about-next {
  margin: 12px 0 8px;
  padding: 30px 22px;
  border-radius: var(--radius-card);
  background:
    radial-gradient(130% 150% at 100% 0%, rgba(46, 107, 85, .55), transparent 60%),
    var(--ink-900);
  color: var(--sand-50);
}

.page-about .about-next h2 {
  margin: 0 0 10px;
  font-family: var(--font-display);
  font-weight: 300;
  font-size: 24px;
  line-height: 1.32;
  letter-spacing: -.01em;
  color: var(--sand-50);
}

.page-about .about-next p {
  margin: 0 0 20px;
  font-size: 14px;
  line-height: 1.75;
  color: rgba(247, 243, 234, .78);
}

.page-about .about-next__links {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.page-about .about-next__links .btn {
  text-decoration: none;
}

.page-about .about-next__links .btn--ghost {
  color: var(--sand-50);
  border-color: rgba(247, 243, 234, .42);
  background: transparent;
}

.page-about .about-next__links .btn--ghost:hover,
.page-about .about-next__links .btn--ghost:focus-visible {
  color: var(--ink-900);
  background: var(--sand-50);
  border-color: var(--sand-50);
}

/* ---------- 平板及以上 ---------- */
@media (min-width: 640px) {
  .page-about .about-wrap {
    padding: 40px 28px 64px;
  }

  .page-about .about-hero h1 {
    font-size: 52px;
  }

  .page-about .about-hero__lede {
    font-size: 18px;
    max-width: 44em;
  }

  .page-about .about-figure--float {
    float: right;
    width: 38%;
    margin: 6px 0 18px 26px;
  }

  .page-about .about-creed {
    padding: 30px 28px;
  }

  .page-about .about-creed p {
    font-size: 32px;
  }

  .page-about .about-team {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .page-about .about-stats {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .page-about .about-pair {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .page-about .about-next {
    padding: 40px 34px;
  }

  .page-about .about-next h2 {
    font-size: 30px;
  }
}

/* ---------- 桌面：左侧细刻度脊柱 ---------- */
@media (min-width: 860px) {
  .page-about .about-wrap {
    padding: 52px 36px 72px;
  }

  .page-about .about-hero h1 {
    font-size: 62px;
  }

  .page-about .about-body::before {
    content: "";
    position: absolute;
    left: 43px;
    top: 12px;
    bottom: 24px;
    width: 1px;
    background: linear-gradient(
      to bottom,
      rgba(15, 43, 36, .22),
      rgba(15, 43, 36, .12) 55%,
      rgba(15, 43, 36, .02)
    );
  }

  .page-about .about-chapter {
    grid-template-columns: 88px minmax(0, 1fr);
    gap: 0 36px;
    padding: 54px 0;
  }

  .page-about .about-chapter__num {
    position: absolute;
    left: 44px;
    top: 6px;
    transform: translateX(-50%);
    writing-mode: vertical-rl;
    text-orientation: upright;
    padding: 9px 4px;
    border-radius: var(--radius-pill);
    font-size: 12px;
    letter-spacing: .12em;
  }

  .page-about .about-chapter__title {
    font-size: 34px;
  }

  .page-about .about-flow {
    gap: 12px;
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .page-about .about-flow__item + .about-flow__item::before {
    content: "";
    position: absolute;
    left: -12px;
    top: 30px;
    width: 12px;
    height: 1px;
    background: var(--clay-200);
  }

  .page-about .about-flow__item {
    padding: 16px 14px 14px;
  }

  .page-about .about-flow__desc {
    font-size: 12.5px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-jump a,
  .page-about .about-flow__item,
  .page-about .about-flow__name,
  .page-about .about-flow__desc,
  .page-about .about-stage summary,
  .page-about .about-stage__hint::before,
  .page-about .about-stage__hint::after,
  .page-about .about-chapter__body a {
    transition: none;
  }
}
<<<END>>>