.page-about {
  --about-rail-w: 216px;
  --about-radius: 18px;
  background: var(--lf-paper);
  color: var(--lf-ink);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  overflow: hidden;
  background: var(--lf-navy);
  color: var(--lf-paper);
  border-bottom: var(--lf-line);
}

.page-about .about-hero__grid {
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(218, 211, 199, 0.16) 1px, transparent 1px),
    linear-gradient(90deg, rgba(218, 211, 199, 0.16) 1px, transparent 1px);
  background-size: 96px 96px, 96px 96px;
  pointer-events: none;
}

.page-about .about-hero__wedge {
  position: absolute;
  inset: 0;
  background: var(--lf-forest);
  clip-path: polygon(72% 0, 100% 0, 100% 100%, 46% 100%);
  opacity: 0.62;
  pointer-events: none;
}

.page-about .about-hero__inner {
  position: relative;
  z-index: 2;
  padding-top: 64px;
  padding-bottom: 52px;
}

.page-about .about-hero__annot {
  color: var(--lf-mint);
  margin: 0 0 18px;
}

.page-about .about-hero__title {
  font-family: var(--lf-font-display);
  font-size: clamp(40px, 10vw, 84px);
  line-height: 0.98;
  letter-spacing: -0.02em;
  margin: 0;
  max-width: 14em;
}

.page-about .about-hero__title-tail {
  font-family: var(--lf-font-display);
  font-size: clamp(24px, 5.4vw, 46px);
  line-height: 1.12;
  letter-spacing: -0.01em;
  color: var(--lf-orange);
  margin: 8px 0 0;
}

.page-about .about-hero__lede {
  max-width: 34em;
  margin: 26px 0 0;
  font-size: 17px;
  line-height: 1.85;
  color: rgba(247, 243, 236, 0.9);
}

.page-about .about-hero__stats {
  display: grid;
  grid-template-columns: 1fr;
  gap: 12px;
  margin-top: 38px;
}

.page-about .about-stat {
  border: 2px solid rgba(247, 243, 236, 0.32);
  background: rgba(247, 243, 236, 0.06);
  padding: 16px 18px;
}

.page-about .about-stat__num {
  display: inline-block;
  font-family: var(--lf-font-mono);
  font-size: 38px;
  font-weight: 700;
  line-height: 1;
  letter-spacing: -0.01em;
  color: var(--lf-paper);
  border-bottom: 3px solid var(--lf-orange);
  padding-bottom: 5px;
}

.page-about .about-stat__label {
  display: block;
  margin-top: 12px;
  font-size: 14px;
  letter-spacing: 0.04em;
  color: rgba(247, 243, 236, 0.78);
}

/* ---------- 面包屑 ---------- */
.page-about .about-crumb {
  padding-top: 22px;
  padding-bottom: 4px;
}

/* ---------- 主体布局 ---------- */
.page-about .about-body {
  padding-top: 12px;
  padding-bottom: 72px;
}

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

/* ---------- 左侧索引轨道 ---------- */
.page-about .about-rail {
  margin-bottom: 30px;
}

.page-about .about-rail__kicker {
  margin: 0 0 10px;
  color: var(--lf-indigo);
}

.page-about .about-rail__list {
  display: flex;
  gap: 8px;
  overflow-x: auto;
  list-style: none;
  margin: 0;
  padding: 2px 0 10px;
  scrollbar-width: none;
}

.page-about .about-rail__list::-webkit-scrollbar {
  display: none;
}

.page-about .about-rail__link {
  display: flex;
  align-items: center;
  gap: 8px;
  white-space: nowrap;
  padding: 8px 14px;
  border: 2px solid var(--lf-navy);
  background: var(--lf-surface);
  color: var(--lf-navy);
  font-size: 14px;
  text-decoration: none;
  transition: background 180ms var(--lf-ease), color 180ms var(--lf-ease);
}

.page-about .about-rail__link:hover,
.page-about .about-rail__link:focus-visible {
  background: var(--lf-navy);
  color: var(--lf-paper);
}

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

.page-about .about-rail__num {
  font-family: var(--lf-font-mono);
  font-weight: 700;
  font-size: 12px;
  color: var(--lf-orange);
}

/* ---------- 章节通用 ---------- */
.page-about .about-sec {
  scroll-margin-top: 120px;
}

.page-about .about-sec + .about-sec {
  margin-top: 56px;
  padding-top: 48px;
  border-top: 2px solid var(--lf-grid);
}

.page-about .about-sec__head {
  margin-bottom: 22px;
}

.page-about .about-sec__annot {
  margin: 0 0 8px;
  color: var(--lf-wine);
}

.page-about .about-sec__title {
  font-family: var(--lf-font-display);
  font-size: clamp(27px, 6.2vw, 48px);
  line-height: 1.06;
  letter-spacing: -0.015em;
  color: var(--lf-navy);
  margin: 0;
}

.page-about .about-p {
  font-size: 17px;
  line-height: 1.85;
  margin: 0 0 1.05em;
  max-width: 34em;
}

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

.page-about .about-list li {
  position: relative;
  padding-left: 26px;
  margin-bottom: 12px;
  line-height: 1.8;
  font-size: 16px;
}

.page-about .about-list li::before {
  content: "";
  position: absolute;
  left: 3px;
  top: 11px;
  width: 10px;
  height: 10px;
  background: var(--lf-mint);
  border: 2px solid var(--lf-navy);
}

.page-about .about-figure {
  margin: 24px 0 0;
}

.page-about .about-figure img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  border: 2px solid var(--lf-navy);
  border-radius: var(--about-radius);
  background: var(--lf-surface);
  object-fit: cover;
}

.page-about .about-figure--wide img {
  aspect-ratio: 9 / 7;
}

.page-about .about-figure--side img {
  aspect-ratio: 3 / 2;
}

.page-about .about-figure--mid img {
  aspect-ratio: 4 / 3;
}

/* ---------- 01 起源 ---------- */
.page-about .about-note {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 12px;
  margin-top: 26px;
  padding: 16px 18px;
  border: 2px solid var(--lf-navy);
  background: var(--lf-surface);
  box-shadow: var(--lf-shadow-ink);
}

.page-about .about-note__mark {
  font-family: var(--lf-font-mono);
  font-size: 12px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--lf-paper);
  background: var(--lf-orange);
  padding: 5px 10px;
}

.page-about .about-note__text {
  font-size: 16px;
  line-height: 1.6;
  color: var(--lf-navy);
  flex: 1 1 220px;
}

/* ---------- 02 网络 ---------- */
.page-about .about-cols {
  display: grid;
  grid-template-columns: 1fr;
  gap: 22px;
  margin-top: 26px;
}

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

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

/* ---------- 03 准入 ---------- */
.page-about .about-steps {
  list-style: none;
  margin: 26px 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: 1fr;
  gap: 16px;
  counter-reset: about-step;
}

.page-about .about-step {
  border: 2px solid var(--lf-navy);
  background: var(--lf-surface);
  padding: 20px 18px 22px;
  box-shadow: var(--lf-shadow);
}

.page-about .about-step__num {
  display: inline-block;
  font-family: var(--lf-font-mono);
  font-size: 28px;
  font-weight: 700;
  line-height: 1;
  color: var(--lf-orange);
  margin-bottom: 14px;
}

.page-about .about-step__title {
  font-size: 19px;
  margin: 0 0 8px;
  color: var(--lf-navy);
  letter-spacing: 0.01em;
}

.page-about .about-step__text {
  margin: 0;
  font-size: 15px;
  line-height: 1.8;
  color: rgba(18, 24, 31, 0.82);
}

.page-about .about-band {
  margin-top: 26px;
  padding: 22px 20px;
  background: var(--lf-forest);
  color: var(--lf-paper);
  border: 2px solid var(--lf-navy);
}

.page-about .about-band__text {
  margin: 0;
  font-size: 16px;
  line-height: 1.85;
  max-width: 34em;
}

/* ---------- 04 团队 ---------- */
.page-about .about-team {
  display: grid;
  grid-template-columns: 1fr;
  gap: 14px;
  margin-top: 24px;
}

.page-about .about-team__item {
  border: 2px solid var(--lf-navy);
  background: var(--lf-surface);
  padding: 18px;
  transition: background 180ms var(--lf-ease), color 180ms var(--lf-ease), box-shadow 180ms var(--lf-ease);
}

.page-about .about-team__item:hover,
.page-about .about-team__item:focus-visible {
  background: var(--lf-navy);
  color: var(--lf-paper);
  box-shadow: var(--lf-shadow);
  outline: none;
}

.page-about .about-team__num {
  display: block;
  font-family: var(--lf-font-mono);
  font-size: 38px;
  font-weight: 700;
  line-height: 1;
  color: var(--lf-navy);
  transition: color 180ms var(--lf-ease);
}

.page-about .about-team__item:hover .about-team__num,
.page-about .about-team__item:focus-visible .about-team__num {
  color: var(--lf-mint);
}

.page-about .about-team__name {
  margin: 12px 0 6px;
  font-size: 18px;
  letter-spacing: 0.02em;
}

.page-about .about-team__desc {
  margin: 0;
  font-size: 15px;
  line-height: 1.75;
  color: rgba(18, 24, 31, 0.8);
  transition: color 180ms var(--lf-ease);
}

.page-about .about-team__item:hover .about-team__desc,
.page-about .about-team__item:focus-visible .about-team__desc {
  color: rgba(247, 243, 236, 0.86);
}

/* ---------- 05 版本时间轴 ---------- */
.page-about .about-timeline {
  list-style: none;
  margin: 28px 0 0;
  padding: 0;
  position: relative;
}

.page-about .about-timeline::before {
  content: "";
  position: absolute;
  left: 8px;
  top: 8px;
  bottom: 8px;
  width: 2px;
  background: var(--lf-grid);
}

.page-about .about-timeline__item {
  position: relative;
  padding-left: 38px;
  padding-bottom: 26px;
}

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

.page-about .about-ver__marker {
  position: absolute;
  left: 0;
  top: 8px;
  width: 18px;
  height: 18px;
  background: var(--lf-paper);
  border: 2px solid var(--lf-navy);
  transform: rotate(45deg);
}

.page-about .about-ver__marker--now {
  background: var(--lf-mint);
  box-shadow: 0 0 0 4px rgba(46, 196, 182, 0.22);
}

.page-about .about-ver__toggle {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 12px;
  width: 100%;
  text-align: left;
  background: none;
  border: 0;
  border-bottom: 2px solid var(--lf-grid);
  padding: 0 0 10px;
  cursor: pointer;
  font: inherit;
  color: var(--lf-navy);
  transition: border-color 180ms var(--lf-ease);
}

.page-about .about-ver__toggle:hover,
.page-about .about-ver__toggle:focus-visible {
  border-bottom-color: var(--lf-orange);
  outline: none;
}

.page-about .about-ver__no {
  font-family: var(--lf-font-mono);
  font-size: 15px;
  font-weight: 700;
  color: var(--lf-orange);
  letter-spacing: 0.02em;
}

.page-about .about-ver__sum {
  font-size: 18px;
  font-weight: 700;
  line-height: 1.45;
  letter-spacing: 0.01em;
}

.page-about .about-ver__panel {
  padding-top: 12px;
}

.page-about .about-ver__panel p {
  margin: 0;
  font-size: 16px;
  line-height: 1.85;
  color: rgba(18, 24, 31, 0.84);
  max-width: 32em;
}

.page-about .about-ver__toggle[aria-expanded="false"] + .about-ver__panel {
  display: none;
}

/* ---------- 06 服务承诺 ---------- */
.page-about .about-promise {
  display: grid;
  grid-template-columns: 1fr;
  gap: 14px;
  margin-top: 24px;
}

.page-about .about-promise__card {
  border: 2px solid var(--lf-navy);
  border-left-width: 8px;
  background: var(--lf-surface);
  padding: 18px 18px 20px;
}

.page-about .about-promise__card--wide {
  border-left-color: var(--lf-mint);
}

.page-about .about-promise__title {
  margin: 0 0 8px;
  font-size: 18px;
  color: var(--lf-navy);
  letter-spacing: 0.01em;
}

.page-about .about-promise__text {
  margin: 0;
  font-size: 15px;
  line-height: 1.78;
  color: rgba(18, 24, 31, 0.82);
}

/* ---------- 结尾 CTA ---------- */
.page-about .about-cta {
  margin-top: 56px;
  border: 2px solid var(--lf-navy);
  background: var(--lf-indigo);
  color: var(--lf-paper);
  border-radius: var(--about-radius);
  overflow: hidden;
}

.page-about .about-cta__inner {
  padding: 30px 22px 34px;
}

.page-about .about-cta__annot {
  margin: 0 0 10px;
  color: var(--lf-mint);
}

.page-about .about-cta__title {
  font-family: var(--lf-font-display);
  font-size: clamp(24px, 5.4vw, 40px);
  line-height: 1.1;
  letter-spacing: -0.015em;
  margin: 0 0 14px;
}

.page-about .about-cta__text {
  margin: 0 0 24px;
  font-size: 16px;
  line-height: 1.85;
  max-width: 34em;
  color: rgba(247, 243, 236, 0.88);
}

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

.page-about .about-cta__btn {
  text-decoration: none;
}

/* ---------- 显现动效 ---------- */
.page-about [data-reveal] {
  opacity: 0;
  transform: translateY(14px);
  transition: opacity 320ms var(--lf-ease), transform 320ms var(--lf-ease);
}

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

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

/* ---------- 中屏 ---------- */
@media (min-width: 640px) {
  .page-about .about-hero__inner {
    padding-top: 84px;
    padding-bottom: 64px;
  }

  .page-about .about-hero__stats {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 16px;
  }

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

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

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

  .page-about .about-cta__inner {
    padding: 40px 36px 44px;
  }
}

/* ---------- 桌面双栏 ---------- */
@media (min-width: 1024px) {
  .page-about .about-body {
    display: grid;
    grid-template-columns: var(--about-rail-w) minmax(0, 1fr);
    gap: 0 64px;
    align-items: start;
    padding-top: 24px;
    padding-bottom: 96px;
  }

  .page-about .about-rail {
    position: sticky;
    top: 112px;
    margin-bottom: 0;
  }

  .page-about .about-rail__list {
    flex-direction: column;
    overflow: visible;
    gap: 0;
    padding: 0;
    border-left: 2px solid var(--lf-grid);
  }

  .page-about .about-rail__link {
    border: 0;
    border-left: 3px solid transparent;
    margin-left: -2px;
    background: transparent;
    padding: 11px 0 11px 16px;
    font-size: 15px;
  }

  .page-about .about-rail__link:hover,
  .page-about .about-rail__link:focus-visible {
    background: rgba(255, 122, 69, 0.1);
    border-left-color: var(--lf-orange);
    color: var(--lf-navy);
  }

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

  .page-about .about-sec + .about-sec {
    margin-top: 76px;
    padding-top: 64px;
  }

  .page-about .about-cols {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
    gap: 32px;
    align-items: start;
  }

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

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

  .page-about .about-cta {
    margin-top: 76px;
  }

  .page-about .about-cta__inner {
    padding: 48px 44px 52px;
  }
}

/* ---------- 宽屏 ---------- */
@media (min-width: 1280px) {
  .page-about .about-hero__inner {
    padding-top: 96px;
    padding-bottom: 76px;
  }

  .page-about .about-hero__stats {
    max-width: 780px;
  }
}
<<<END>>>