.page-about {
  --about-rail-w: 236px;
  --about-gap: clamp(28px, 4vw, 64px);
  background: var(--ff-night);
  color: var(--ff-ink);
  padding-bottom: clamp(48px, 7vw, 96px);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  padding: calc(var(--ff-header-h) + clamp(34px, 6vw, 76px)) 0 clamp(34px, 5vw, 56px);
  border-bottom: 1px solid var(--ff-line);
  overflow: hidden;
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  top: calc(var(--ff-header-h) + 10px);
  right: -110px;
  width: 360px;
  height: 360px;
  background-image:
    linear-gradient(var(--ff-line) 1px, transparent 1px),
    linear-gradient(90deg, var(--ff-line) 1px, transparent 1px);
  background-size: 44px 44px;
  opacity: 0.3;
  transform: rotate(6deg);
  pointer-events: none;
  -webkit-mask-image: radial-gradient(circle at 65% 35%, #000 0%, transparent 72%);
  mask-image: radial-gradient(circle at 65% 35%, #000 0%, transparent 72%);
}

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

.page-about .about-hero__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 26px;
  align-items: end;
  margin-top: clamp(20px, 3vw, 34px);
}

.page-about .about-hero__eyebrow {
  display: flex;
  align-items: center;
  gap: 10px;
  margin: 0;
  font-family: var(--ff-font-data);
  font-size: var(--ff-fs-1);
  letter-spacing: 0.1em;
  color: var(--ff-ink-2);
  text-transform: uppercase;
}

.page-about .about-hero__eyebrow-mark {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 30px;
  height: 20px;
  padding: 0 6px;
  background: var(--ff-orange);
  color: var(--ff-night);
  font-weight: 700;
  border-radius: 2px;
}

.page-about .about-hero__title {
  margin: 16px 0 0;
  font-size: clamp(32px, 6.2vw, 60px);
  line-height: 1.12;
  letter-spacing: -0.02em;
  color: var(--ff-ink);
  max-width: 16em;
}

.page-about .about-hero__lede {
  margin: 20px 0 0;
  max-width: 62ch;
  font-size: var(--ff-fs-3);
  line-height: 1.85;
  color: var(--ff-ink-2);
}

.page-about .about-hero__lede--second {
  margin-top: 12px;
  color: var(--ff-gray);
  font-size: var(--ff-fs-2);
}

.page-about .about-hero__note {
  margin: 0;
  font-size: var(--ff-fs-2);
  line-height: 1.85;
  color: var(--ff-ink-2);
}

.page-about .about-hero__kpis {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin-top: clamp(28px, 4vw, 48px);
  background: var(--ff-line);
  border: 1px solid var(--ff-line);
  border-radius: var(--ff-radius);
  overflow: hidden;
}

.page-about .about-kpi {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: 16px 18px;
  background: var(--ff-night);
}

.page-about .about-kpi__value {
  font-family: var(--ff-font-data);
  font-size: clamp(24px, 3.4vw, 34px);
  font-weight: 700;
  line-height: 1.1;
  color: var(--ff-ink);
  font-variant-numeric: tabular-nums;
}

.page-about .about-kpi:nth-child(3) .about-kpi__value {
  color: var(--ff-green);
}

.page-about .about-kpi__unit {
  font-size: 0.55em;
  margin-left: 2px;
  color: var(--ff-ink-2);
}

.page-about .about-kpi__label {
  font-size: var(--ff-fs-1);
  letter-spacing: 0.06em;
  color: var(--ff-ink-2);
}

/* ---------- 主体骨架 ---------- */
.page-about .about-shell {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: var(--about-gap);
  padding-top: clamp(36px, 5vw, 72px);
}

.page-about .about-rail__title {
  margin: 0 0 12px;
  font-family: var(--ff-font-data);
  font-size: var(--ff-fs-1);
  letter-spacing: 0.12em;
  color: var(--ff-orange);
  text-transform: uppercase;
}

.page-about .about-rail__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 4px 16px;
}

.page-about .about-rail__link {
  display: flex;
  align-items: baseline;
  gap: 10px;
  padding: 7px 0;
  font-size: var(--ff-fs-2);
  color: var(--ff-ink-2);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color var(--ff-t) var(--ff-ease), border-color var(--ff-t) var(--ff-ease);
}

.page-about .about-rail__link:hover {
  color: var(--ff-ink);
}

.page-about .about-rail__link:focus-visible {
  outline: 2px solid var(--ff-orange);
  outline-offset: 3px;
}

.page-about .about-rail__num {
  font-family: var(--ff-font-data);
  font-size: var(--ff-fs-1);
  color: var(--ff-gray);
  font-variant-numeric: tabular-nums;
}

.page-about .about-rail__link[data-active="true"] {
  color: var(--ff-ink);
  border-bottom-color: var(--ff-green);
}

.page-about .about-rail__link[data-active="true"] .about-rail__num {
  color: var(--ff-orange);
}

.page-about .about-rail__hint {
  margin: 14px 0 0;
  font-size: var(--ff-fs-1);
  line-height: 1.7;
  color: var(--ff-gray);
}

.page-about .about-flow {
  display: grid;
  gap: clamp(44px, 6vw, 84px);
  min-width: 0;
}

.page-about .about-stage {
  min-width: 0;
  padding-top: clamp(24px, 3vw, 38px);
  border-top: 1px solid var(--ff-line);
}

.page-about .about-stage:first-child {
  border-top: 0;
  padding-top: 0;
}

.page-about .about-stage__lede {
  margin: 0 0 22px;
  max-width: 64ch;
  font-size: var(--ff-fs-3);
  line-height: 1.85;
  color: var(--ff-ink-2);
}

.page-about .about-stage__lede--tight {
  margin-top: 26px;
  margin-bottom: 0;
}

/* ---------- 时间轴 ---------- */
.page-about .about-timeline {
  list-style: none;
  margin: 0;
  padding: 0;
  position: relative;
  display: grid;
  gap: clamp(26px, 3.6vw, 38px);
}

.page-about .about-timeline::before {
  content: "";
  position: absolute;
  left: 5px;
  top: 8px;
  bottom: 8px;
  width: 1px;
  background: linear-gradient(180deg, var(--ff-orange) 0%, var(--ff-line) 26%, var(--ff-line) 100%);
}

.page-about .about-timeline__item {
  position: relative;
  padding-left: 34px;
}

.page-about .about-timeline__item::before {
  content: "";
  position: absolute;
  left: 0;
  top: 6px;
  width: 11px;
  height: 11px;
  border-radius: 50%;
  background: var(--ff-night);
  border: 1px solid var(--ff-orange);
  box-shadow: 0 0 0 4px rgba(255, 106, 30, 0.08);
}

.page-about .about-timeline__phase {
  margin: 0;
  font-family: var(--ff-font-data);
  font-size: var(--ff-fs-1);
  letter-spacing: 0.08em;
  color: var(--ff-orange);
}

.page-about .about-timeline__title {
  margin: 6px 0 8px;
  font-family: var(--ff-font-head);
  font-size: var(--ff-fs-4);
  font-weight: 800;
  line-height: 1.3;
  color: var(--ff-ink);
}

.page-about .about-timeline__text {
  margin: 0;
  max-width: 66ch;
  font-size: var(--ff-fs-3);
  line-height: 1.85;
  color: var(--ff-ink-2);
}

/* ---------- 表格 ---------- */
.page-about .about-table__caption {
  margin: 0 0 10px;
  font-family: var(--ff-font-data);
  font-size: var(--ff-fs-1);
  letter-spacing: 0.06em;
  color: var(--ff-gray);
}

.page-about .about-table th[scope="row"] {
  color: var(--ff-ink);
  font-weight: 700;
  white-space: nowrap;
}

.page-about .about-table td {
  color: var(--ff-ink-2);
  vertical-align: top;
  min-width: 140px;
}

/* ---------- 团队构成 ---------- */
.page-about .about-roster {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 14px;
}

.page-about .about-roster__card {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: 20px;
  background: var(--ff-board);
  border: 1px solid var(--ff-line);
  border-radius: var(--ff-radius);
}

.page-about .about-roster__count {
  font-family: var(--ff-font-data);
  font-size: clamp(28px, 4vw, 38px);
  font-weight: 700;
  line-height: 1;
  color: var(--ff-green);
  font-variant-numeric: tabular-nums;
}

.page-about .about-roster__role {
  margin: 4px 0 0;
  font-family: var(--ff-font-head);
  font-size: var(--ff-fs-3);
  font-weight: 800;
  color: var(--ff-ink);
}

.page-about .about-roster__text {
  margin: 0;
  font-size: var(--ff-fs-2);
  line-height: 1.75;
  color: var(--ff-ink-2);
}

/* ---------- 更正记录 ---------- */
.page-about .about-correct {
  display: grid;
  gap: 10px;
}

.page-about .about-correct__item .ff-details__body p {
  margin: 0;
  font-size: var(--ff-fs-3);
  line-height: 1.85;
  color: var(--ff-ink-2);
}

/* ---------- 计划列表 ---------- */
.page-about .about-plans {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 0;
}

.page-about .about-plans__item {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 16px;
  align-items: start;
  padding: 18px 0;
  border-bottom: 1px solid var(--ff-line);
}

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

.page-about .about-plans__num {
  padding-top: 3px;
  font-family: var(--ff-font-data);
  font-size: var(--ff-fs-1);
  font-weight: 700;
  letter-spacing: 0.08em;
  color: var(--ff-orange);
}

.page-about .about-plans__title {
  margin: 0 0 5px;
  font-family: var(--ff-font-head);
  font-size: var(--ff-fs-3);
  font-weight: 800;
  color: var(--ff-ink);
}

.page-about .about-plans__text {
  margin: 0;
  font-size: var(--ff-fs-2);
  line-height: 1.8;
  color: var(--ff-ink-2);
}

/* ---------- 收束区块 ---------- */
.page-about .about-cta {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 20px;
  margin-top: clamp(28px, 4vw, 44px);
  padding: clamp(22px, 3.6vw, 38px);
  background: var(--ff-screen);
  border: 1px solid var(--ff-line);
  border-left: 2px solid var(--ff-orange);
  border-radius: var(--ff-radius);
}

.page-about .about-cta__title {
  margin: 0 0 8px;
  font-family: var(--ff-font-head);
  font-size: var(--ff-fs-4);
  font-weight: 800;
  line-height: 1.3;
  color: var(--ff-ink);
}

.page-about .about-cta__text {
  margin: 0;
  max-width: 60ch;
  font-size: var(--ff-fs-3);
  line-height: 1.8;
  color: var(--ff-ink-2);
}

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

/* ---------- 图片 ---------- */
.page-about .about-figure {
  margin: clamp(24px, 3.6vw, 40px) 0 0;
}

.page-about .about-figure__cap {
  margin-top: 10px;
  font-size: var(--ff-fs-1);
  line-height: 1.7;
  color: var(--ff-gray);
}

.page-about .about-figure .ff-media {
  max-width: 100%;
}

.page-about .about-figure .ff-media__img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}

/* ---------- 响应式 ---------- */
@media (min-width: 720px) {
  .page-about .about-hero__kpis {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

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

  .page-about .about-cta {
    grid-template-columns: minmax(0, 1fr) auto;
    align-items: center;
  }
}

@media (min-width: 900px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 8fr) minmax(0, 4fr);
    gap: clamp(28px, 4vw, 64px);
  }
}

@media (min-width: 1024px) {
  .page-about .about-shell {
    grid-template-columns: var(--about-rail-w) minmax(0, 1fr);
  }

  .page-about .about-rail__inner {
    position: sticky;
    top: calc(var(--ff-header-h) + 28px);
  }

  .page-about .about-rail__list {
    grid-template-columns: minmax(0, 1fr);
    gap: 2px;
  }

  .page-about .about-hero__title {
    max-width: 13em;
  }
}

@media (max-width: 719px) {
  .page-about .about-hero::before {
    display: none;
  }

  .page-about .about-rail__hint {
    display: none;
  }

  .page-about .about-timeline__item {
    padding-left: 26px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-rail__link {
    transition: none;
  }
}
<<<END>>>
</main>