.page-about {
  --about-gap: clamp(1rem, 2.4vw, 1.75rem);
  --about-rail-w: 190px;
  background-color: var(--ink);
  color: var(--snow);
  font-family: var(--font-body);
  overflow-x: clip;
  padding-bottom: clamp(2.5rem, 6vw, 5rem);
}

.page-about .about-crumb {
  width: var(--shell);
  margin: 0 auto;
  padding-top: clamp(1rem, 2.5vw, 1.75rem);
}

/* ---------- 首屏框景 ---------- */
.page-about .about-hero {
  width: var(--shell);
  margin: 0 auto;
  padding-top: clamp(0.75rem, 2vw, 1.5rem);
}

.page-about .about-hero__frame {
  position: relative;
  padding: clamp(1.5rem, 5vw, 4rem) clamp(1.1rem, 4vw, 3.25rem) clamp(1.6rem, 3.5vw, 2.9rem);
  border: 1px solid var(--hair-strong);
  background:
    repeating-linear-gradient(to right, rgba(244, 247, 242, 0.045) 0 1px, transparent 1px 110px),
    radial-gradient(115% 120% at 106% -10%, rgba(226, 102, 47, 0.32) 0%, rgba(226, 102, 47, 0) 58%),
    linear-gradient(155deg, var(--ink-raised) 0%, var(--ink) 48%, var(--ink-deepest) 100%);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 38px), calc(100% - 38px) 100%, 0 100%);
}

.page-about .about-hero__frame::after {
  content: "";
  position: absolute;
  left: 0;
  right: 38px;
  bottom: 0;
  height: 9px;
  background-image: repeating-linear-gradient(to right, var(--hair-strong) 0 1px, transparent 1px 15px);
  opacity: 0.75;
  pointer-events: none;
}

.page-about .about-hero__title {
  margin: 0.65rem 0 0;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(2.1rem, 8.4vw, 4.9rem);
  line-height: 1.03;
  letter-spacing: -0.015em;
  color: var(--snow);
}

.page-about .about-hero__title span {
  background: linear-gradient(100deg, var(--sand-bright), var(--dusk));
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.page-about .about-hero__lead {
  margin: clamp(1rem, 2.6vw, 1.5rem) 0 0;
  max-width: 46ch;
  font-size: clamp(1rem, 1.6vw, 1.125rem);
  line-height: 1.8;
  color: var(--line);
}

.page-about .about-hero__stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1rem 1.25rem;
  margin: clamp(1.5rem, 4vw, 2.5rem) 0 0;
  padding-top: clamp(0.9rem, 2.5vw, 1.4rem);
  border-top: 1px solid var(--hair);
}

.page-about .about-hero__stats > div {
  display: flex;
  flex-direction: column-reverse;
  gap: 0.2rem;
  min-width: 0;
}

.page-about .about-hero__stats dt {
  font-size: 0.75rem;
  letter-spacing: 0.14em;
  color: var(--gobi);
}

.page-about .about-hero__stats dd {
  margin: 0;
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: clamp(1.35rem, 3.4vw, 2rem);
  line-height: 1.1;
  color: var(--neon);
}

/* ---------- 主体：章节索引 + 内容流 ---------- */
.page-about .about-body {
  width: var(--shell);
  margin: clamp(2rem, 5vw, 3.75rem) auto 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(1.25rem, 3vw, 2.5rem);
}

.page-about .about-rail {
  border-top: 1px solid var(--hair);
  padding-top: 0.75rem;
}

.page-about .about-rail__label {
  margin: 0;
  font-size: 0.75rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--gobi);
}

.page-about .about-rail__list {
  display: flex;
  gap: 0.5rem;
  margin: 0.75rem 0 0;
  padding: 0 0 0.35rem;
  list-style: none;
  overflow-x: auto;
  scrollbar-width: thin;
}

.page-about .about-rail__link {
  display: inline-flex;
  align-items: center;
  gap: 0.45rem;
  padding: 0.4rem 0.8rem;
  border: 1px solid var(--hair);
  border-radius: 999px;
  color: var(--line);
  font-size: 0.875rem;
  text-decoration: none;
  white-space: nowrap;
  transition: border-color 0.2s var(--ease), color 0.2s var(--ease), background-color 0.2s var(--ease);
}

.page-about .about-rail__link:hover,
.page-about .about-rail__link:focus-visible {
  border-color: var(--sand);
  color: var(--snow);
  background-color: rgba(216, 168, 78, 0.1);
  outline: none;
}

.page-about .about-rail__num {
  color: var(--sand);
  font-size: 0.75rem;
}

/* ---------- 章节 ---------- */
.page-about .about-flow {
  min-width: 0;
}

.page-about .about-section {
  padding: clamp(1.75rem, 4.5vw, 3.25rem) 0;
  border-bottom: 1px solid var(--hair);
}

.page-about .about-section--last {
  border-bottom: 0;
  padding-bottom: 0;
}

.page-about .about-section__head {
  display: flex;
  align-items: baseline;
  gap: 0.75rem;
  flex-wrap: wrap;
}

.page-about .about-section__no {
  font-size: clamp(1.6rem, 5vw, 2.4rem);
  line-height: 1;
  color: var(--dune);
  opacity: 0.6;
}

.page-about .about-section__title {
  margin: 0;
  flex: 1 1 16rem;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(1.55rem, 4.4vw, 2.6rem);
  line-height: 1.14;
  color: var(--snow);
}

.page-about .about-section__lead {
  margin: clamp(0.9rem, 2.4vw, 1.35rem) 0 0;
  max-width: 62ch;
  font-size: clamp(1rem, 1.4vw, 1.075rem);
  line-height: 1.85;
  color: var(--line);
}

.page-about .about-section p {
  max-width: 62ch;
  font-size: 1rem;
  line-height: 1.85;
  color: var(--line);
}

.page-about .about-subtitle {
  margin: clamp(1.5rem, 3.5vw, 2.25rem) 0 0;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(1.15rem, 2.6vw, 1.5rem);
  color: var(--snow);
}

/* ---------- 图片 ---------- */
.page-about .about-figure {
  margin: clamp(1.25rem, 3vw, 2rem) 0 0;
}

.page-about .about-figure--flush {
  margin-top: 0;
}

.page-about .about-figure__frame {
  border-radius: var(--radius-sm);
  overflow: hidden;
  border: 1px solid var(--hair);
  background-color: var(--ink-deepest);
}

.page-about .about-figure__frame img {
  display: block;
  width: 100%;
  height: auto;
  max-width: 100%;
  object-fit: cover;
}

/* ---------- 筛选按钮 ---------- */
.page-about .about-filter {
  margin-top: clamp(1.1rem, 2.6vw, 1.6rem);
}

/* ---------- 时间线 ---------- */
.page-about .about-timeline {
  list-style: none;
  margin: clamp(1.25rem, 3vw, 1.9rem) 0 0;
  padding: 0 0 0 1.5rem;
  border-left: 1px solid var(--hair-strong);
  display: grid;
  gap: clamp(0.9rem, 2.2vw, 1.4rem);
}

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

.page-about .about-timeline__item::before {
  content: "";
  position: absolute;
  left: -1.5rem;
  top: 0.6rem;
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background-color: var(--sand);
  box-shadow: 0 0 0 4px rgba(216, 168, 78, 0.16);
  transform: translateX(-50%);
}

.page-about .about-timeline__year {
  margin: 0 0 0.35rem;
  font-family: var(--font-mono);
  font-size: 0.95rem;
  letter-spacing: 0.06em;
  color: var(--neon);
}

.page-about .about-timeline__card {
  padding: clamp(0.9rem, 2.2vw, 1.3rem) clamp(1rem, 2.4vw, 1.4rem);
  border: 1px solid var(--hair);
  border-radius: var(--radius-sm);
  background: linear-gradient(180deg, rgba(31, 107, 74, 0.18), rgba(7, 19, 15, 0.28));
}

.page-about .about-timeline__name {
  margin: 0 0 0.4rem;
  font-size: clamp(1rem, 1.5vw, 1.1rem);
  font-weight: 700;
  color: var(--snow);
}

.page-about .about-timeline__card p {
  margin: 0;
  font-size: 0.95rem;
  line-height: 1.8;
  color: var(--gobi);
  max-width: 58ch;
}

/* ---------- 团队 ---------- */
.page-about .about-team {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 0.9rem;
  margin: clamp(1.25rem, 3vw, 1.9rem) 0 0;
  padding: 0;
  list-style: none;
}

.page-about .about-team__card {
  padding: clamp(0.95rem, 2.3vw, 1.35rem);
  border: 1px solid var(--hair);
  border-left: 3px solid var(--pitch);
  border-radius: var(--radius-sm);
  background: linear-gradient(150deg, rgba(31, 107, 74, 0.2), rgba(11, 36, 28, 0.4));
}

.page-about .about-team__role {
  margin: 0 0 0.45rem;
  font-size: 0.82rem;
  letter-spacing: 0.12em;
  color: var(--sand);
}

.page-about .about-team__role .us-num {
  font-size: 1.05rem;
  color: var(--snow);
  margin-right: 0.25rem;
}

.page-about .about-team__card p:last-child {
  margin: 0;
  font-size: 0.95rem;
  line-height: 1.8;
  color: var(--gobi);
}

/* ---------- 三级流程 ---------- */
.page-about .about-flow-steps {
  display: grid;
  gap: 0.85rem;
  margin: 1rem 0 0;
  padding: 0;
  list-style: none;
}

.page-about .about-flow-steps__item {
  display: flex;
  gap: 0.9rem;
  padding: 0.95rem 1rem;
  border: 1px solid var(--hair);
  border-radius: var(--radius-sm);
  background-color: rgba(7, 19, 15, 0.42);
}

.page-about .about-flow-steps__no {
  flex: 0 0 auto;
  width: 2rem;
  height: 2rem;
  display: grid;
  place-items: center;
  border-radius: 50%;
  border: 1px solid var(--sand);
  color: var(--sand);
  font-size: 0.9rem;
}

.page-about .about-flow-steps__name {
  margin: 0 0 0.3rem;
  font-weight: 700;
  color: var(--snow);
}

.page-about .about-flow-steps__item p:last-child {
  margin: 0;
  font-size: 0.95rem;
  line-height: 1.75;
  color: var(--gobi);
}

/* ---------- 覆盖规模 ---------- */
.page-about .about-coverage {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin: clamp(1.25rem, 3vw, 1.9rem) 0;
  border: 1px solid var(--hair);
  border-radius: var(--radius-sm);
  background-color: var(--hair);
  overflow: hidden;
}

.page-about .about-coverage > div {
  padding: clamp(1rem, 2.6vw, 1.6rem);
  background: linear-gradient(160deg, var(--ink-raised), var(--ink-deepest));
}

.page-about .about-coverage__num {
  margin: 0;
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: clamp(1.7rem, 5vw, 2.6rem);
  line-height: 1;
  color: var(--neon);
}

.page-about .about-coverage__label {
  margin: 0.5rem 0 0;
  font-size: 0.82rem;
  letter-spacing: 0.08em;
  color: var(--gobi);
}

/* ---------- 承诺 ---------- */
.page-about .about-promise {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(1.1rem, 2.6vw, 1.75rem);
  margin-top: clamp(1.25rem, 3vw, 1.9rem);
  align-items: start;
}

.page-about .about-promise__list {
  display: grid;
  gap: 0.85rem;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .about-promise__list li {
  position: relative;
  padding-left: 1.35rem;
  font-size: 0.98rem;
  line-height: 1.8;
  color: var(--line);
}

.page-about .about-promise__list strong {
  color: var(--snow);
}

.page-about .about-promise__dot {
  position: absolute;
  left: 0;
  top: 0.7em;
  width: 7px;
  height: 7px;
  border-radius: 2px;
  background-color: var(--sand);
  transform: rotate(45deg);
}

/* ---------- 批次条 ---------- */
.page-about .about-batch {
  margin-top: clamp(1.5rem, 3.5vw, 2.25rem);
  padding: clamp(1rem, 2.8vw, 1.5rem) clamp(1rem, 3vw, 1.65rem);
  border: 1px solid var(--sand);
  border-radius: var(--radius-sm);
  background:
    linear-gradient(120deg, rgba(216, 168, 78, 0.14), rgba(7, 19, 15, 0.5));
}

.page-about .about-batch__label {
  margin: 0;
  font-size: 0.75rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--sand);
}

.page-about .about-batch__value {
  margin: 0.4rem 0 0;
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: clamp(1.2rem, 3.2vw, 1.6rem);
  color: var(--snow);
}

.page-about .about-batch__note {
  margin: 0.6rem 0 0;
  max-width: 54ch;
  font-size: 0.95rem;
  line-height: 1.8;
  color: var(--line);
}

.page-about .about-batch__copy {
  margin-top: 0.9rem;
}

/* ---------- 结尾按钮 ---------- */
.page-about .about-cta {
  display: flex;
  flex-wrap: wrap;
  gap: 0.65rem;
  margin-top: clamp(1.5rem, 3.5vw, 2.25rem);
}

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

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

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

  .page-about .about-promise {
    grid-template-columns: minmax(0, 1fr) minmax(0, 0.85fr);
  }
}

@media (min-width: 920px) {
  .page-about .about-body {
    grid-template-columns: var(--about-rail-w) minmax(0, 1fr);
    gap: clamp(1.75rem, 4vw, 3.5rem);
  }

  .page-about .about-rail {
    position: sticky;
    top: 112px;
    align-self: start;
    border-top: 0;
    padding-top: 0;
  }

  .page-about .about-rail__list {
    flex-direction: column;
    overflow: visible;
    padding-bottom: 0;
  }

  .page-about .about-rail__link {
    width: 100%;
    border-radius: var(--radius-sm);
    white-space: normal;
  }

  .page-about .about-figure--flush {
    margin-top: 0.25rem;
  }
}

@media (min-width: 1280px) {
  .page-about .about-hero__frame {
    padding-right: clamp(3rem, 5vw, 5rem);
  }

  .page-about .about-timeline {
    padding-left: 2rem;
  }

  .page-about .about-timeline__item::before {
    left: -2rem;
  }
}

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