.page-about .about-crumb {
  padding-top: clamp(5.5rem, 10vw, 7.5rem);
}

.page-about .about-crumb .breadcrumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.5rem;
  margin: 0;
  padding: 0;
  list-style: none;
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--mist);
}

.page-about .about-crumb .breadcrumb a {
  color: var(--mist);
  text-decoration: none;
  transition: color 0.24s var(--ease);
}

.page-about .about-crumb .breadcrumb a:hover,
.page-about .about-crumb .breadcrumb a:focus-visible {
  color: var(--turquoise);
}

.page-about .about-crumb .breadcrumb [aria-current="page"] {
  color: var(--snow);
}

.page-about .breadcrumb__sep {
  color: var(--line);
}

/* ---------- 首屏 ---------- */

.page-about .about-hero {
  position: relative;
  display: grid;
  gap: clamp(1.75rem, 4vw, 3rem);
  padding-top: clamp(1.75rem, 4vw, 3rem);
  padding-bottom: clamp(2.5rem, 6vw, 4.5rem);
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(var(--line) 1px, transparent 1px),
    linear-gradient(90deg, var(--line) 1px, transparent 1px);
  background-size: 88px 88px;
  opacity: 0.16;
  pointer-events: none;
  -webkit-mask-image: radial-gradient(62% 68% at 28% 32%, #000 0%, transparent 100%);
  mask-image: radial-gradient(62% 68% at 28% 32%, #000 0%, transparent 100%);
}

.page-about .about-hero > * {
  position: relative;
  z-index: 1;
}

.page-about .about-hero__copy .lede {
  margin-top: 1rem;
  max-width: 36em;
}

.page-about .about-hero__facts {
  list-style: none;
  margin: clamp(1.5rem, 3vw, 2.25rem) 0 0;
  padding: 1.25rem 0 0;
  border-top: 1px solid var(--line);
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 1rem;
}

.page-about .about-hero__facts b {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(1.15rem, 2.4vw, 1.55rem);
  color: var(--gold);
  letter-spacing: 0.02em;
}

.page-about .about-hero__facts span {
  display: block;
  margin-top: 0.4rem;
  font-size: 12px;
  line-height: 1.55;
  color: var(--mist);
}

.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin-top: 1.75rem;
}

.page-about .about-hero__figure {
  margin: 0;
  min-width: 0;
}

.page-about .about-hero__figure img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
  border-radius: var(--radius-card);
}

.page-about .media-frame__caption {
  margin-top: 0.65rem;
  font-size: 12px;
  color: var(--mist);
}

/* ---------- 正文骨架：左侧刻度 + 右侧内容 ---------- */

.page-about .about-body {
  display: grid;
  gap: clamp(1.5rem, 3vw, 2.5rem);
  padding-bottom: clamp(2.5rem, 6vw, 4.5rem);
}

.page-about .about-rail__label {
  margin: 0 0 0.65rem;
  font-size: 11px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--mist);
}

.page-about .about-rail__list {
  list-style: none;
  margin: 0;
  padding: 0 0 0.25rem;
  display: flex;
  gap: 0.6rem;
  overflow-x: auto;
  scrollbar-width: thin;
}

.page-about .chapter-link {
  display: inline-flex;
  align-items: center;
  gap: 0.45rem;
  padding: 0.4rem 0.8rem;
  border-radius: var(--radius-pill);
  background: var(--surface-soft);
  border: 1px solid transparent;
  color: var(--mist);
  text-decoration: none;
  white-space: nowrap;
  font-size: 12px;
  letter-spacing: 0.1em;
  transition: color 0.24s var(--ease), border-color 0.24s var(--ease), background 0.24s var(--ease);
}

.page-about .chapter-link:hover,
.page-about .chapter-link:focus-visible {
  color: var(--snow);
  border-color: var(--turquoise);
}

.page-about .chapter-link[aria-current="location"] {
  background: var(--turquoise);
  color: var(--night);
}

.page-about .about-rail__tick {
  font-family: var(--font-mono);
  font-size: 11px;
  opacity: 0.75;
}

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

/* ---------- 章节通用 ---------- */

.page-about .about-section {
  padding-block: clamp(2rem, 5vw, 3.5rem);
  border-top: 1px solid var(--line);
  scroll-margin-top: 6rem;
}

.page-about .about-flow > .about-section:first-child {
  border-top: 0;
  padding-top: 0;
}

.page-about .about-section .display-title {
  margin: 0.35rem 0 1.1rem;
}

.page-about .about-section .lede {
  max-width: 36em;
  margin: 0 0 clamp(1.25rem, 3vw, 1.85rem);
}

.page-about .about-prose {
  max-width: 38em;
}

.page-about .about-prose p {
  margin: 0 0 1.15rem;
  line-height: 1.75;
}

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

.page-about .about-prose a,
.page-about .about-view__aside-note a,
.page-about .about-timeline-section__note a {
  color: var(--turquoise);
  text-decoration: none;
  border-bottom: 1px solid rgba(47, 211, 181, 0.4);
  transition: border-color 0.24s var(--ease);
}

.page-about .about-prose a:hover,
.page-about .about-view__aside-note a:hover,
.page-about .about-timeline-section__note a:hover {
  border-bottom-color: var(--turquoise);
}

.page-about .about-figure {
  margin: clamp(1.5rem, 4vw, 2.5rem) 0 0;
}

.page-about .media-frame img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  border-radius: var(--radius-card);
}

/* ---------- 01 视角 ---------- */

.page-about .about-view__grid {
  display: grid;
  gap: clamp(1.5rem, 4vw, 2.5rem);
}

.page-about .about-view__aside {
  border-radius: var(--radius-card);
  border: 1px solid var(--line);
  background: linear-gradient(150deg, var(--panel), rgba(16, 31, 60, 0.35));
  padding: 1.25rem 1.15rem 1.35rem;
}

.page-about .about-view__aside-title {
  margin: 0 0 0.9rem;
  font-size: 11px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--mist);
}

.page-about .about-view__questions {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 0.8rem;
}

.page-about .about-view__questions li {
  display: grid;
  grid-template-columns: 2rem 1fr;
  align-items: start;
  gap: 0.5rem;
  font-size: 14px;
  line-height: 1.6;
  color: var(--snow);
  padding-bottom: 0.8rem;
  border-bottom: 1px dashed var(--line);
}

.page-about .about-view__questions li:last-child {
  border-bottom: 0;
  padding-bottom: 0;
}

.page-about .about-view__questions span {
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--coral);
}

.page-about .about-view__aside-note {
  margin: 1rem 0 0;
  font-size: 12px;
  line-height: 1.6;
  color: var(--mist);
}

/* ---------- 02 栏目对照 ---------- */

.page-about .nav-compare {
  display: grid;
  gap: 1rem;
  margin-top: clamp(1.5rem, 4vw, 2.25rem);
}

.page-about .nav-compare__col {
  border-radius: var(--radius-card);
  padding: 1.1rem 1rem 1.25rem;
  border: 1px solid var(--line);
}

.page-about .nav-compare__col--old {
  background: rgba(16, 31, 60, 0.4);
}

.page-about .nav-compare__col--new {
  background: linear-gradient(165deg, rgba(47, 211, 181, 0.12), rgba(16, 31, 60, 0.65));
  border-color: rgba(47, 211, 181, 0.32);
}

.page-about .nav-compare__title {
  margin: 0 0 0.85rem;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.12em;
  color: var(--mist);
}

.page-about .nav-compare__col--new .nav-compare__title {
  color: var(--turquoise);
}

.page-about .nav-compare__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 0.45rem;
  font-size: 13px;
  color: var(--mist);
}

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

.page-about .nav-compare__col--old .nav-compare__list li {
  padding: 0.35rem 0;
  border-bottom: 1px dashed var(--line);
  text-decoration: line-through;
  text-decoration-color: rgba(140, 59, 50, 0.9);
}

.page-about .nav-compare__list--new li {
  padding: 0.55rem 0.65rem;
  border-radius: 12px;
  background: rgba(10, 20, 40, 0.55);
  border: 1px solid transparent;
  transition: border-color 0.24s var(--ease), background 0.24s var(--ease);
}

.page-about .nav-compare__list--new li span {
  color: var(--snow);
  font-size: 14px;
  letter-spacing: 0.02em;
}

.page-about .nav-compare__list--new li em {
  display: block;
  margin-top: 0.3rem;
  font-style: normal;
  font-size: 12px;
  line-height: 1.55;
  color: var(--mist);
  transition: color 0.24s var(--ease), opacity 0.24s var(--ease);
}

.page-about .nav-compare__list--new li:hover,
.page-about .nav-compare__list--new li:focus-within {
  border-color: var(--turquoise);
  background: rgba(47, 211, 181, 0.1);
}

.page-about .nav-compare__list--new li:hover em,
.page-about .nav-compare__list--new li:focus-within em {
  color: var(--snow);
}

.page-about .nav-compare__list--new li:focus-visible {
  outline: 2px solid var(--turquoise);
  outline-offset: 2px;
}

/* ---------- 03 四段节奏 ---------- */

.page-about .rhythm {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 0.9rem;
}

.page-about .rhythm__item {
  position: relative;
  padding: 1.1rem 1rem 1.25rem;
  border-radius: var(--radius-card);
  border: 1px solid var(--line);
  background: var(--panel);
  transition: transform 0.28s var(--ease), border-color 0.28s var(--ease);
}

.page-about .rhythm__item:hover {
  transform: translateY(-4px);
  border-color: var(--turquoise);
}

.page-about .rhythm__num {
  display: block;
  font-family: var(--font-mono);
  font-size: 1.5rem;
  line-height: 1;
  color: var(--gold);
}

.page-about .rhythm__item h3 {
  margin: 0.6rem 0 0.4rem;
  font-size: 16px;
  letter-spacing: 0.04em;
  color: var(--snow);
}

.page-about .rhythm__item p {
  margin: 0;
  font-size: 13px;
  line-height: 1.65;
  color: var(--mist);
}

/* ---------- 04 团队 ---------- */

.page-about .roles {
  display: grid;
  gap: 1.1rem;
  margin-bottom: clamp(1.5rem, 4vw, 2.25rem);
}

.page-about .roles__item {
  border-top: 2px solid var(--turquoise);
  padding-top: 0.9rem;
}

.page-about .roles__item:nth-child(2) {
  border-top-color: var(--coral);
}

.page-about .roles__item:nth-child(3) {
  border-top-color: var(--gold);
}

.page-about .roles__item h3 {
  margin: 0 0 0.45rem;
  font-size: 16px;
  letter-spacing: 0.03em;
  color: var(--snow);
}

.page-about .roles__item p {
  margin: 0;
  font-size: 14px;
  line-height: 1.7;
  color: var(--mist);
}

.page-about .pipeline {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 0.6rem;
  counter-reset: pipe;
}

.page-about .pipeline li {
  position: relative;
  padding: 0.8rem 0.9rem 0.8rem 2.3rem;
  border: 1px dashed var(--line);
  border-radius: 14px;
  font-size: 13px;
  color: var(--mist);
  counter-increment: pipe;
}

.page-about .pipeline li::before {
  content: counter(pipe, decimal-leading-zero);
  position: absolute;
  left: 0.8rem;
  top: 50%;
  transform: translateY(-50%);
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--turquoise);
}

.page-about .about-team__note {
  margin: 1.1rem 0 0;
  font-size: 12px;
  line-height: 1.65;
  color: var(--mist);
}

/* ---------- 05 时间线 ---------- */

.page-about .timeline {
  list-style: none;
  margin: 0;
  padding: 0 0 0 1.5rem;
  border-left: 1px solid var(--line);
  display: grid;
  gap: clamp(1.25rem, 3vw, 1.9rem);
}

.page-about .timeline__item {
  position: relative;
  padding-bottom: 0.25rem;
}

.page-about .timeline__item::before {
  content: "";
  position: absolute;
  left: -1.5rem;
  top: 0.5rem;
  width: 9px;
  height: 9px;
  margin-left: -5px;
  border-radius: 50%;
  background: var(--night);
  border: 1px solid var(--turquoise);
  box-shadow: 0 0 0 4px rgba(47, 211, 181, 0.08);
}

.page-about .timeline__item--current::before {
  background: var(--gold);
  border-color: var(--gold);
  box-shadow: 0 0 0 5px rgba(242, 193, 78, 0.14);
}

.page-about .timeline__ver {
  margin: 0 0 0.3rem;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.12em;
  color: var(--gold);
}

.page-about .timeline__body h3 {
  margin: 0 0 0.35rem;
  font-size: 16px;
  letter-spacing: 0.03em;
  color: var(--snow);
}

.page-about .timeline__body p {
  margin: 0;
  max-width: 36em;
  font-size: 14px;
  line-height: 1.7;
  color: var(--mist);
}

.page-about .timeline__item--current .timeline__body {
  padding: 0.9rem 1rem;
  border-radius: 14px;
  background: rgba(16, 31, 60, 0.75);
  border: 1px solid rgba(242, 193, 78, 0.28);
}

.page-about .about-timeline-section__note {
  margin: 1.5rem 0 0;
  padding-left: 1.5rem;
  font-size: 12px;
  line-height: 1.65;
  color: var(--mist);
}

/* ---------- 06 合作生态 ---------- */

.page-about .about-partners {
  position: relative;
  overflow: hidden;
  border-radius: var(--radius-card);
  border: 1px solid var(--line);
  padding: clamp(1.5rem, 5vw, 3rem);
  margin-top: clamp(2rem, 5vw, 3.5rem);
}

.page-about .partners__media {
  position: absolute;
  inset: 0;
  z-index: 0;
}

.page-about .partners__media img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: 0.32;
  border-radius: 0;
}

.page-about .about-partners::after {
  content: "";
  position: absolute;
  inset: 0;
  z-index: 1;
  background: linear-gradient(118deg, rgba(10, 20, 40, 0.94) 32%, rgba(10, 20, 40, 0.58) 100%);
}

.page-about .partners__content {
  position: relative;
  z-index: 2;
}

.page-about .partners__stats {
  list-style: none;
  margin: clamp(1.5rem, 4vw, 2.25rem) 0 0;
  padding: 1.15rem 0 0;
  border-top: 1px solid rgba(47, 211, 181, 0.35);
  display: grid;
  gap: 1rem;
}

.page-about .partners__stats li {
  display: flex;
  align-items: baseline;
  gap: 0.65rem;
}

.page-about .partners__stats b {
  font-family: var(--font-mono);
  font-size: clamp(1.4rem, 3vw, 1.9rem);
  color: var(--gold);
  line-height: 1;
}

.page-about .partners__stats span {
  font-size: 12px;
  line-height: 1.55;
  color: var(--mist);
}

/* ---------- 下一步 ---------- */

.page-about .about-next {
  display: grid;
  gap: 0.7rem;
  margin-top: clamp(2rem, 5vw, 3rem);
  padding-top: clamp(1.5rem, 4vw, 2rem);
  border-top: 1px solid var(--line);
}

.page-about .about-next__link {
  display: flex;
  flex-direction: column;
  gap: 0.3rem;
  padding: 0.95rem 1rem;
  border-radius: 16px;
  border: 1px solid var(--line);
  background: var(--surface-soft);
  color: var(--snow);
  text-decoration: none;
  font-size: 14px;
  transition: transform 0.26s var(--ease), border-color 0.26s var(--ease);
}

.page-about .about-next__link em {
  font-style: normal;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  color: var(--turquoise);
}

.page-about .about-next__link:hover,
.page-about .about-next__link:focus-visible {
  transform: translateY(-4px);
  border-color: var(--turquoise);
}

/* ---------- 响应式 ---------- */

@media (min-width: 720px) {
  .page-about .rhythm {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

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

  .page-about .pipeline {
    grid-template-columns: repeat(5, minmax(0, 1fr));
  }

  .page-about .pipeline li {
    padding: 1.4rem 0.6rem 0.7rem;
    text-align: center;
  }

  .page-about .pipeline li::before {
    left: 50%;
    top: 0.6rem;
    transform: translateX(-50%);
  }

  .page-about .nav-compare {
    grid-template-columns: minmax(0, 0.8fr) minmax(0, 1.2fr);
    align-items: start;
  }

  .page-about .partners__stats {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 1.25rem;
  }

  .page-about .partners__stats li {
    flex-direction: column;
    align-items: flex-start;
    gap: 0.4rem;
  }

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

@media (min-width: 900px) {
  .page-about .about-hero {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, 0.85fr);
    align-items: start;
  }

  .page-about .about-hero__figure img {
    clip-path: polygon(9% 0, 100% 0, 100% 100%, 0 100%);
  }

  .page-about .about-view__grid {
    grid-template-columns: minmax(0, 1.5fr) minmax(0, 0.85fr);
    align-items: start;
  }

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

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

@media (min-width: 960px) {
  .page-about .about-body {
    grid-template-columns: 136px minmax(0, 1fr);
    gap: clamp(2rem, 4vw, 3.25rem);
  }

  .page-about .about-rail {
    position: sticky;
    top: clamp(6rem, 10vw, 7.5rem);
    align-self: start;
    height: max-content;
  }

  .page-about .about-rail__list {
    display: grid;
    gap: 0;
    padding: 0;
    overflow: visible;
    border-left: 1px solid var(--line);
  }

  .page-about .about-rail__list li {
    position: relative;
    padding: 0.5rem 0 0.5rem 0.95rem;
  }

  .page-about .about-rail__list li::before {
    content: "";
    position: absolute;
    left: -1px;
    top: 1rem;
    width: 9px;
    height: 1px;
    background: var(--line);
  }

  .page-about .chapter-link {
    flex-direction: column;
    align-items: flex-start;
    gap: 0.15rem;
    padding: 0;
    border: 0;
    border-radius: 0;
    background: none;
    white-space: normal;
    transition: color 0.24s var(--ease);
  }

  .page-about .chapter-link[aria-current="location"] {
    background: none;
    color: var(--turquoise);
  }

  .page-about .about-rail__name {
    font-size: 12px;
    letter-spacing: 0.08em;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .chapter-link,
  .page-about .rhythm__item,
  .page-about .about-next__link,
  .page-about .nav-compare__list--new li,
  .page-about .nav-compare__list--new li em {
    transition: none;
  }
}
<<<PAGE_CSS_END>>>