.page-about {
  --about-gutter: 20px;
  --about-radius: var(--bw-radius);
  background: var(--bw-ink);
  overflow-x: clip;
}

/* ---------- 面包屑 ---------- */
.page-about .about-crumb {
  font-family: var(--bw-font-mono);
  font-size: 12px;
  letter-spacing: .08em;
  color: var(--bw-neutral-light);
  display: flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 26px;
}
.page-about .about-crumb a {
  color: var(--bw-neutral-light);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color .2s var(--bw-ease), border-color .2s var(--bw-ease);
}
.page-about .about-crumb a:hover {
  color: var(--bw-lime);
  border-bottom-color: var(--bw-lime);
}
.page-about .about-crumb [aria-current="page"] {
  color: var(--bw-bone);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  padding-block: clamp(88px, 10vw, 118px) clamp(40px, 6vw, 68px);
  border-bottom: var(--bw-line);
  background:
    radial-gradient(760px 380px at 92% -14%, rgba(157, 255, 60, .14), transparent 62%),
    radial-gradient(560px 340px at 2% 108%, rgba(255, 92, 58, .16), transparent 64%),
    linear-gradient(180deg, var(--bw-ink-deep), var(--bw-ink));
  overflow: hidden;
}
.page-about .about-hero__slash {
  position: absolute;
  right: -110px;
  top: 40px;
  width: 320px;
  height: 320px;
  background: repeating-linear-gradient(
    135deg,
    rgba(157, 255, 60, .16) 0 6px,
    transparent 6px 18px
  );
  transform: rotate(22deg);
  opacity: .5;
  pointer-events: none;
}
.page-about .about-hero__inner {
  position: relative;
  display: grid;
  gap: 40px;
  align-items: end;
}
.page-about .about-hero h1 {
  font-family: var(--bw-font-head);
  font-weight: 900;
  font-size: clamp(30px, 6.4vw, 58px);
  line-height: 1.08;
  letter-spacing: -.02em;
  color: var(--bw-bone);
  margin: 14px 0 0;
  max-width: 16em;
}
.page-about .about-hero__lede {
  font-size: 15.5px;
  line-height: 1.85;
  color: var(--bw-neutral-light);
  max-width: 620px;
  margin: 20px 0 0;
}
.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 28px;
}

.page-about .about-hero__panel {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--bw-neutral);
  border: var(--bw-line);
  border-radius: var(--about-radius);
  overflow: hidden;
  box-shadow: var(--bw-shadow-hard);
}
.page-about .about-figure {
  background: var(--bw-ink-deep);
  padding: 16px 14px 14px;
  display: flex;
  flex-direction: column;
  gap: 6px;
}
.page-about .about-figure__num {
  font-family: var(--bw-font-mono);
  font-size: clamp(28px, 5vw, 40px);
  font-weight: 700;
  line-height: 1;
  letter-spacing: -.03em;
  color: var(--bw-lime);
}
.page-about .about-figure__label {
  font-size: 12.5px;
  line-height: 1.6;
  color: var(--bw-neutral-light);
}

/* ---------- 主体骨架 ---------- */
.page-about .about-shell {
  display: grid;
  grid-template-columns: 1fr;
  gap: 28px;
  padding-block: 36px 88px;
}

/* ---------- 章节目录 ---------- */
.page-about .about-toc {
  position: sticky;
  top: var(--bw-header-h);
  z-index: 6;
  padding: 12px 0;
  background: rgba(8, 10, 13, .94);
  border-block: 1px solid var(--bw-neutral);
}
.page-about .about-toc__title {
  display: none;
}
.page-about .about-toc__list {
  display: flex;
  gap: 8px;
  margin: 0;
  padding: 0;
  list-style: none;
  overflow-x: auto;
  scrollbar-width: none;
  white-space: nowrap;
}
.page-about .about-toc__list::-webkit-scrollbar {
  display: none;
}
.page-about .bw-toc__link {
  display: block;
  font-family: var(--bw-font-mono);
  font-size: 12px;
  letter-spacing: .06em;
  color: var(--bw-neutral-light);
  text-decoration: none;
  padding: 6px 12px;
  border: 1px solid var(--bw-neutral);
  border-radius: var(--bw-capsule);
  transition: color .2s var(--bw-ease), border-color .2s var(--bw-ease), background-color .2s var(--bw-ease);
}
.page-about .bw-toc__link:hover,
.page-about .bw-toc__link.is-active,
.page-about .bw-toc__link[aria-current] {
  color: var(--bw-lime);
  border-color: var(--bw-lime);
  background: rgba(157, 255, 60, .08);
}

/* ---------- 章节 ---------- */
.page-about .about-flow {
  min-width: 0;
}
.page-about .about-chapter {
  padding-block: 40px;
  border-top: 1px solid var(--bw-neutral);
  scroll-margin-top: calc(var(--bw-header-h) + 76px);
}
.page-about .about-chapter:first-child {
  padding-top: 4px;
  border-top: 0;
}
.page-about .about-chapter__head {
  display: flex;
  align-items: baseline;
  gap: 14px;
  margin-bottom: 20px;
}
.page-about .bw-chapter__index {
  font-family: var(--bw-font-mono);
  font-size: clamp(26px, 5vw, 42px);
  font-weight: 700;
  line-height: 1;
  letter-spacing: -.04em;
  color: var(--bw-clay);
  flex: none;
}
.page-about .about-chapter:nth-of-type(even) .bw-chapter__index {
  color: var(--bw-lime);
}
.page-about .about-chapter h2 {
  font-family: var(--bw-font-head);
  font-weight: 900;
  font-size: clamp(21px, 3.6vw, 32px);
  line-height: 1.22;
  letter-spacing: -.01em;
  color: var(--bw-bone);
  margin: 0;
}
.page-about .about-chapter__body p {
  font-size: 15.5px;
  line-height: 1.85;
  color: var(--bw-neutral-light);
  max-width: 660px;
  margin: 0 0 16px;
}
.page-about .about-chapter__body p:last-child {
  margin-bottom: 0;
}
.page-about .about-quote {
  margin: 26px 0 4px;
  padding: 18px 20px;
  max-width: 660px;
  background: var(--bw-surface);
  border-left: 4px solid var(--bw-lime);
  border-radius: 0 var(--about-radius) var(--about-radius) 0;
  font-family: var(--bw-font-head);
  font-size: 16.5px;
  font-weight: 800;
  line-height: 1.65;
  color: var(--bw-bone);
}

/* ---------- 团队分工 ---------- */
.page-about .about-roles {
  display: grid;
  grid-template-columns: 1fr;
  gap: 14px;
  margin-top: 26px;
}
.page-about .about-role {
  display: flex;
  flex-direction: column;
  gap: 8px;
  padding: 18px 18px 20px;
}
.page-about .about-role__num {
  font-family: var(--bw-font-mono);
  font-size: 11px;
  letter-spacing: .18em;
  color: var(--bw-clay);
}
.page-about .about-role h3 {
  font-family: var(--bw-font-head);
  font-weight: 800;
  font-size: 17px;
  color: var(--bw-bone);
  margin: 0;
}
.page-about .about-role p {
  font-size: 14px;
  line-height: 1.78;
  color: var(--bw-neutral-light);
  margin: 0;
}

/* ---------- 图片 ---------- */
.page-about .about-shot {
  margin: 26px 0 0;
}
.page-about .about-shot img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
  border: var(--bw-line);
  border-radius: var(--about-radius);
  box-shadow: var(--bw-shadow-hard);
  background: var(--bw-surface);
}
.page-about .about-shot figcaption {
  margin-top: 10px;
  font-family: var(--bw-font-mono);
  font-size: 12px;
  line-height: 1.6;
  letter-spacing: .03em;
  color: var(--bw-neutral-light);
}

/* ---------- 内容方法 ---------- */
.page-about .about-method {
  display: grid;
  grid-template-columns: 1fr;
  gap: 28px;
  margin-top: 22px;
}
.page-about .about-method__intro {
  font-size: 15.5px;
  line-height: 1.8;
  color: var(--bw-bone);
  margin: 0 0 18px;
}
.page-about .about-method__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 20px;
}
.page-about .about-method__list li {
  position: relative;
  padding-left: 18px;
  border-left: 3px solid var(--bw-steel);
}
.page-about .about-method__list li:nth-child(2) {
  border-left-color: var(--bw-lime);
}
.page-about .about-method__list li:nth-child(3) {
  border-left-color: var(--bw-clay);
}
.page-about .about-method__list h3 {
  font-family: var(--bw-font-head);
  font-weight: 800;
  font-size: 16px;
  color: var(--bw-bone);
  margin: 0 0 6px;
}
.page-about .about-method__list p {
  font-size: 14.5px;
  line-height: 1.8;
  color: var(--bw-neutral-light);
  margin: 0;
  max-width: 620px;
}
.page-about .about-shot--method {
  margin-top: 0;
}

/* ---------- 区内动作 ---------- */
.page-about .about-inline-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 24px;
}

/* ---------- 时间轴 ---------- */
.page-about .about-timeline {
  list-style: none;
  position: relative;
  margin: 10px 0 0;
  padding: 0;
}
.page-about .about-timeline::before {
  content: "";
  position: absolute;
  left: 7px;
  top: 8px;
  bottom: 8px;
  width: 2px;
  background: linear-gradient(180deg, var(--bw-lime) 0%, var(--bw-steel) 48%, var(--bw-clay) 100%);
}
.page-about .about-timeline__item {
  position: relative;
  padding: 0 0 24px 34px;
}
.page-about .about-timeline__item:last-child {
  padding-bottom: 0;
}
.page-about .about-timeline__item::before {
  content: "";
  position: absolute;
  left: 0;
  top: 18px;
  width: 16px;
  height: 16px;
  border: 2px solid var(--bw-lime);
  border-radius: 50%;
  background: var(--bw-ink);
}
.page-about .about-timeline__item:nth-child(3)::before {
  border-color: var(--bw-clay);
}
.page-about .about-timeline__card {
  background: var(--bw-surface);
  border: 1px solid var(--bw-neutral);
  border-radius: var(--about-radius);
  padding: 16px 18px 18px;
  transition: border-color .2s var(--bw-ease), transform .2s var(--bw-ease);
}
.page-about .about-timeline__card:hover {
  border-color: var(--bw-lime);
  transform: translateX(3px);
}
.page-about .about-timeline__card h3 {
  font-family: var(--bw-font-head);
  font-weight: 800;
  font-size: 16px;
  color: var(--bw-bone);
  margin: 10px 0 6px;
}
.page-about .about-timeline__card p {
  font-size: 14px;
  line-height: 1.78;
  color: var(--bw-neutral-light);
  margin: 0;
}

.page-about .about-cadence {
  display: flex;
  align-items: center;
  gap: 18px;
  margin-top: 28px;
  padding: 18px 20px;
  background: var(--bw-ink-deep);
  border: var(--bw-line);
  border-radius: var(--about-radius);
  box-shadow: var(--bw-shadow-lime);
}
.page-about .about-cadence__num {
  font-family: var(--bw-font-mono);
  font-size: clamp(42px, 9vw, 68px);
  font-weight: 700;
  line-height: 1;
  letter-spacing: -.05em;
  color: var(--bw-lime);
  flex: none;
}
.page-about .about-cadence__text {
  font-size: 14.5px;
  line-height: 1.78;
  color: var(--bw-bone);
  margin: 0;
}

/* ---------- 选择理由 ---------- */
.page-about .about-reasons {
  list-style: none;
  margin: 6px 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: 1fr;
  gap: 18px;
}
.page-about .about-reason {
  padding: 2px 0 2px 16px;
  border-left: 3px solid var(--bw-clay);
}
.page-about .about-reason:nth-child(2n) {
  border-left-color: var(--bw-steel);
}
.page-about .about-reason h3 {
  font-family: var(--bw-font-head);
  font-weight: 800;
  font-size: 15.5px;
  color: var(--bw-bone);
  margin: 0 0 6px;
}
.page-about .about-reason p {
  font-size: 14px;
  line-height: 1.78;
  color: var(--bw-neutral-light);
  margin: 0;
  max-width: 480px;
}

/* ---------- 收尾 CTA ---------- */
.page-about .about-cta {
  position: relative;
  border-top: var(--bw-line);
  background:
    linear-gradient(120deg, rgba(157, 255, 60, .1) 0%, transparent 42%),
    linear-gradient(300deg, rgba(255, 92, 58, .14) 0%, transparent 46%),
    var(--bw-ink-deep);
  padding-block: 48px 56px;
}
.page-about .about-cta__inner {
  display: grid;
  gap: 16px;
}
.page-about .about-cta__title {
  font-family: var(--bw-font-head);
  font-weight: 900;
  font-size: clamp(22px, 4vw, 34px);
  line-height: 1.22;
  letter-spacing: -.01em;
  color: var(--bw-bone);
  margin: 0;
  max-width: 20em;
}
.page-about .about-cta__text {
  font-size: 15px;
  line-height: 1.8;
  color: var(--bw-neutral-light);
  margin: 0;
  max-width: 620px;
}
.page-about .about-cta__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 8px;
}

/* ---------- 返回顶部 ---------- */
.page-about .bw-backtop {
  position: fixed;
  right: 18px;
  bottom: 22px;
  z-index: 40;
  width: 46px;
  height: 46px;
  display: grid;
  place-items: center;
  font-family: var(--bw-font-mono);
  font-size: 18px;
  line-height: 1;
  color: var(--bw-lime);
  background: var(--bw-ink-deep);
  border: var(--bw-line);
  border-radius: var(--bw-capsule);
  box-shadow: var(--bw-shadow-hard);
  cursor: pointer;
  opacity: 0;
  visibility: hidden;
  transition: opacity .24s var(--bw-ease), visibility .24s var(--bw-ease), color .2s var(--bw-ease);
}
.page-about .bw-backtop[data-visible],
.page-about .bw-backtop.is-visible {
  opacity: 1;
  visibility: visible;
}
.page-about .bw-backtop:hover {
  color: var(--bw-ink);
  background: var(--bw-lime);
}

/* ---------- 平板及桌面 ---------- */
@media (min-width: 700px) {
  .page-about .about-roles {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
  .page-about .about-reasons {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
  .page-about .about-cadence {
    padding: 22px 26px;
  }
  .page-about .about-cta {
    padding-block: 64px 72px;
  }
}

@media (min-width: 900px) {
  .page-about .about-hero__inner {
    grid-template-columns: minmax(0, 1.25fr) minmax(300px, .75fr);
    gap: 56px;
  }
  .page-about .about-method {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, .95fr);
    gap: 40px;
    align-items: start;
  }
  .page-about .about-shot--method {
    margin-top: 6px;
  }
  .page-about .about-cta__inner {
    grid-template-columns: minmax(0, 1fr) auto;
    align-items: center;
    gap: 20px 40px;
  }
  .page-about .about-cta__title {
    grid-column: 1;
  }
  .page-about .about-cta__text {
    grid-column: 1;
  }
  .page-about .about-cta__actions {
    grid-column: 2;
    grid-row: 1 / span 2;
    justify-content: flex-end;
    max-width: 320px;
    margin-top: 0;
  }
}

@media (min-width: 1000px) {
  .page-about .about-shell {
    grid-template-columns: 218px minmax(0, 1fr);
    gap: 0 64px;
    padding-block: 56px 128px;
  }
  .page-about .about-toc {
    position: sticky;
    top: calc(var(--bw-header-h) + 26px);
    align-self: start;
    padding: 18px 16px;
    background: var(--bw-ink-deep);
    border: var(--bw-line);
    border-radius: var(--about-radius);
    box-shadow: var(--bw-shadow-hard);
  }
  .page-about .about-toc__title {
    display: block;
    font-family: var(--bw-font-mono);
    font-size: 11px;
    letter-spacing: .18em;
    color: var(--bw-neutral-light);
    margin: 0 0 12px;
  }
  .page-about .about-toc__list {
    flex-direction: column;
    gap: 2px;
    overflow: visible;
    white-space: normal;
  }
  .page-about .bw-toc__link {
    border: 0;
    border-left: 2px solid transparent;
    border-radius: 0;
    padding: 7px 10px;
    background: none;
  }
  .page-about .bw-toc__link:hover,
  .page-about .bw-toc__link.is-active,
  .page-about .bw-toc__link[aria-current] {
    background: rgba(157, 255, 60, .07);
    border-left-color: var(--bw-lime);
  }
  .page-about .about-chapter {
    padding-block: 52px;
  }
  .page-about .about-chapter:first-child {
    padding-top: 8px;
  }
  .page-about .about-shot img {
    box-shadow: var(--bw-shadow-deep);
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-timeline__card,
  .page-about .about-crumb a,
  .page-about .bw-toc__link,
  .page-about .bw-backtop {
    transition: none;
  }
  .page-about .about-timeline__card:hover {
    transform: none;
  }
}
<<<END>>>