.page-about {
  position: relative;
  overflow-x: clip;
  background:
    radial-gradient(760px 440px at 88% -8%, rgba(99, 216, 232, 0.13), transparent 68%),
    radial-gradient(640px 400px at 2% 0%, rgba(182, 243, 90, 0.09), transparent 70%),
    var(--ink-900);
  color: var(--paper);
  font-family: var(--font-body);
  font-size: var(--fs-body);
  line-height: 1.78;
}

.page-about::before {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background-image:
    linear-gradient(to right, rgba(46, 95, 122, 0.16) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(46, 95, 122, 0.11) 1px, transparent 1px);
  background-size: 92px 92px;
  -webkit-mask-image: linear-gradient(to bottom, rgba(0, 0, 0, 0.6), transparent 58%);
  mask-image: linear-gradient(to bottom, rgba(0, 0, 0, 0.6), transparent 58%);
}

.page-about > .about-shell {
  position: relative;
  z-index: 1;
  padding-block: clamp(1rem, 3vw, 1.75rem) clamp(3rem, 7vw, 5rem);
}

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

.page-about [id] {
  scroll-margin-top: 6.5rem;
}

.page-about .breadcrumb {
  margin: 0 0 clamp(1.25rem, 3vw, 2rem);
  font-size: var(--fs-small);
}

.page-about h1,
.page-about h2,
.page-about h3 {
  font-family: var(--font-display);
  letter-spacing: -0.015em;
  margin: 0;
}

.page-about .eyebrow {
  margin: 0 0 0.6rem;
  font-family: var(--font-mono);
  font-size: var(--fs-small);
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--ice);
}

.page-about .section-title {
  font-size: clamp(1.55rem, 3.6vw, 2.3rem);
  font-weight: 800;
  line-height: 1.22;
  margin-bottom: 0.75rem;
}

.page-about p {
  margin: 0 0 0.9rem;
}

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

.page-about .mono {
  font-family: var(--font-mono);
  letter-spacing: 0.01em;
}

/* 首屏 */
.page-about .about-hero {
  display: grid;
  gap: clamp(1.5rem, 3vw, 2.5rem);
  padding-block: clamp(0.5rem, 2vw, 1rem) clamp(2rem, 5vw, 3.5rem);
}

.page-about .about-hero__title {
  font-size: clamp(2.35rem, 9vw, 4.4rem);
  font-weight: 800;
  line-height: 1.02;
  letter-spacing: -0.03em;
  margin-bottom: 1.1rem;
}

.page-about .about-hero__accent {
  display: block;
  color: var(--signal);
}

.page-about .about-hero__lead {
  max-width: 52ch;
  color: rgba(244, 248, 250, 0.84);
  font-size: clamp(0.95rem, 2vw, 1.0625rem);
}

.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.6rem;
  margin-top: 1.4rem;
}

.page-about .about-hero__aside {
  align-self: end;
}

.page-about .about-facts {
  border: 1px solid var(--line-soft);
  border-radius: var(--radius);
  padding: 1rem 1.05rem 0.4rem;
  background: linear-gradient(180deg, rgba(18, 59, 88, 0.9), rgba(7, 24, 38, 0.92));
  box-shadow: var(--lift);
}

.page-about .about-facts__title {
  margin: 0 0 0.5rem;
  font-family: var(--font-mono);
  font-size: var(--fs-small);
  letter-spacing: 0.14em;
  color: var(--amber);
}

.page-about .about-facts__list {
  margin: 0;
}

.page-about .about-facts__row {
  display: flex;
  flex-wrap: wrap;
  gap: 0.25rem 0.75rem;
  justify-content: space-between;
  align-items: baseline;
  padding-block: 0.55rem;
  border-bottom: 1px dashed var(--line-faint);
}

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

.page-about .about-facts__row dt {
  color: var(--muted);
  font-size: var(--fs-small);
}

.page-about .about-facts__row dd {
  margin: 0;
  font-size: var(--fs-small);
  color: var(--paper);
  text-align: right;
}

/* 目录条 */
.page-about .about-index {
  border-top: 1px solid var(--line-faint);
  border-bottom: 1px solid var(--line-faint);
  padding-block: 0.35rem;
  margin-bottom: clamp(2rem, 5vw, 3.5rem);
  overflow-x: auto;
  scrollbar-width: thin;
}

.page-about .about-index__list {
  display: flex;
  gap: 0.25rem;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .about-index__link {
  display: inline-block;
  padding: 0.5rem 0.7rem;
  font-family: var(--font-mono);
  font-size: var(--fs-small);
  color: var(--muted);
  text-decoration: none;
  white-space: nowrap;
  border: 1px solid transparent;
  border-radius: var(--radius);
  transition: color 160ms ease, border-color 160ms ease, background-color 160ms ease;
}

.page-about .about-index__link:hover,
.page-about .about-index__link:focus-visible {
  color: var(--paper);
  border-color: var(--line);
}

.page-about .about-index__link.is-active {
  color: var(--ink-900);
  background: var(--signal);
  border-color: var(--signal);
}

/* 主张章节 */
.page-about .about-idea {
  display: grid;
  gap: clamp(1.5rem, 3.5vw, 2.75rem);
  padding-bottom: clamp(2.25rem, 5vw, 3.75rem);
  border-bottom: 1px solid var(--line-faint);
}

.page-about .about-idea__text > p {
  max-width: 58ch;
  color: rgba(244, 248, 250, 0.86);
}

.page-about .about-idea__list {
  list-style: none;
  margin: 1.5rem 0 0;
  padding: 0;
  display: grid;
  gap: 0.85rem;
}

.page-about .about-idea__item {
  display: grid;
  gap: 0.35rem;
  padding-left: 0.9rem;
  border-left: 2px solid var(--line);
}

.page-about .about-idea__item p {
  color: rgba(168, 190, 207, 0.95);
  font-size: var(--fs-small);
  line-height: 1.75;
}

.page-about .about-idea__figure {
  margin: 0;
}

.page-about .media-frame {
  border: 1px solid var(--line-soft);
  border-radius: var(--radius);
  background: linear-gradient(160deg, rgba(18, 59, 88, 0.82), rgba(7, 24, 38, 0.95));
  overflow: hidden;
  box-shadow: var(--lift);
}

.page-about .media-frame img {
  width: 100%;
  object-fit: cover;
}

.page-about .about-idea__caption,
.page-about .about-reach__caption {
  margin-top: 0.6rem;
  font-size: var(--fs-small);
  color: var(--muted);
  line-height: 1.7;
}

/* 通用双栏章节 */
.page-about .about-section {
  display: grid;
  gap: clamp(1.5rem, 3.5vw, 2.75rem);
  padding-block: clamp(2.25rem, 5vw, 3.75rem);
  border-bottom: 1px solid var(--line-faint);
}

.page-about .about-section__body > p {
  max-width: 60ch;
  color: rgba(244, 248, 250, 0.86);
}

.page-about .about-section__intro {
  color: var(--muted) !important;
}

.page-about .about-inline-num {
  color: var(--signal);
  font-weight: 600;
}

.page-about .about-section__actions {
  margin-top: 1.4rem;
  display: flex;
  flex-wrap: wrap;
  gap: 0.6rem;
}

.page-about .about-note {
  border: 1px dashed var(--line-faint);
  border-left: 2px solid var(--amber);
  border-radius: var(--radius);
  padding: 0.9rem 1rem;
  background: rgba(12, 38, 59, 0.75);
}

.page-about .about-note__label {
  margin: 0 0 0.45rem;
  font-size: var(--fs-small);
  letter-spacing: 0.14em;
  color: var(--amber);
}

.page-about .about-note p {
  font-size: var(--fs-small);
  color: rgba(196, 214, 226, 0.95);
}

.page-about .about-note__list {
  margin: 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 0.4rem;
  font-size: var(--fs-small);
  color: rgba(196, 214, 226, 0.95);
}

.page-about .about-note__list .mono {
  color: var(--ice);
}

/* 时间线 */
.page-about .about-timeline {
  list-style: none;
  margin: 1.5rem 0 0;
  padding: 0 0 0 1.5rem;
  position: relative;
  display: grid;
  gap: 1.6rem;
}

.page-about .about-timeline::before {
  content: "";
  position: absolute;
  left: 0.32rem;
  top: 0.5rem;
  bottom: 0.5rem;
  width: 1px;
  background: linear-gradient(180deg, var(--signal), var(--line) 62%, rgba(46, 95, 122, 0));
}

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

.page-about .about-timeline__item::before {
  content: "";
  position: absolute;
  left: calc(-1.5rem + 0.06rem);
  top: 0.5rem;
  width: 0.5rem;
  height: 0.5rem;
  border: 1px solid var(--signal);
  background: var(--ink-900);
  transform: rotate(45deg);
  transition: background-color 200ms ease, box-shadow 200ms ease;
}

.page-about .about-timeline__item:hover::before,
.page-about .about-timeline__item:focus-within::before {
  background: var(--signal);
  box-shadow: 0 0 0 4px rgba(182, 243, 90, 0.16);
}

.page-about .about-timeline__stage {
  display: inline-block;
  font-size: var(--fs-small);
  letter-spacing: 0.12em;
  color: var(--amber);
  margin-bottom: 0.2rem;
}

.page-about .about-timeline__title {
  font-size: clamp(1.05rem, 2.4vw, 1.25rem);
  font-weight: 700;
  margin-bottom: 0.35rem;
}

.page-about .about-timeline__item p {
  max-width: 56ch;
  font-size: var(--fs-small);
  color: rgba(196, 214, 226, 0.95);
}

.page-about .about-growth__figure {
  margin-bottom: 0.85rem;
}

/* 覆盖与规模 */
.page-about .about-reach {
  display: grid;
  gap: clamp(1.25rem, 3vw, 2rem);
  padding-block: clamp(2.25rem, 5vw, 3.75rem);
  border-bottom: 1px solid var(--line-faint);
}

.page-about .about-reach__lead {
  max-width: 62ch;
  color: rgba(244, 248, 250, 0.86);
}

.page-about .about-stats {
  display: grid;
  gap: 0.75rem;
  grid-template-columns: 1fr;
}

.page-about .about-stat {
  border: 1px solid var(--line-faint);
  border-top: 2px solid var(--signal);
  border-radius: var(--radius);
  padding: 0.95rem 1rem 1.05rem;
  background: linear-gradient(180deg, rgba(18, 59, 88, 0.78), rgba(7, 24, 38, 0.94));
  transition: border-color 200ms ease, transform 200ms ease, box-shadow 200ms ease;
}

.page-about .about-stat:hover,
.page-about .about-stat:focus-visible {
  transform: translateY(-3px);
  border-color: rgba(182, 243, 90, 0.7);
  box-shadow: var(--lift);
  outline: none;
}

.page-about .about-stat__num {
  margin: 0;
  font-size: clamp(1.85rem, 5vw, 2.5rem);
  font-weight: 700;
  line-height: 1.05;
  color: var(--signal);
}

.page-about .about-stat__suffix {
  font-size: 0.55em;
  margin-left: 0.15em;
}

.page-about .about-stat__unit {
  margin: 0.15rem 0 0.5rem;
  font-size: var(--fs-small);
  color: var(--paper);
  letter-spacing: 0.06em;
}

.page-about .about-stat__desc {
  margin: 0;
  font-size: var(--fs-small);
  line-height: 1.7;
  color: var(--muted);
}

.page-about .about-stat:hover .about-stat__desc,
.page-about .about-stat:focus-visible .about-stat__desc {
  color: rgba(217, 231, 240, 0.98);
}

.page-about .about-reach__figure {
  margin: 0;
}

/* 分类标签 */
.page-about .about-chips {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
  list-style: none;
  margin: 1.1rem 0 0;
  padding: 0;
}

/* 费用卡 */
.page-about .about-cost {
  padding-block: clamp(2.25rem, 5vw, 3.75rem);
  border-bottom: 1px solid var(--line-faint);
}

.page-about .about-cost__head {
  max-width: 68ch;
  margin-bottom: clamp(1.25rem, 3vw, 1.9rem);
}

.page-about .about-cost__head p {
  color: rgba(244, 248, 250, 0.86);
}

.page-about .about-cost__grid {
  display: grid;
  gap: 0.9rem;
  grid-template-columns: 1fr;
}

.page-about .about-cost__card {
  position: relative;
  border: 1px solid var(--line-soft);
  border-radius: var(--radius);
  padding: 1.15rem 1.1rem 1.25rem;
  background:
    linear-gradient(180deg, rgba(18, 59, 88, 0.86), rgba(7, 24, 38, 0.94));
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.page-about .about-cost__card::after {
  content: "";
  position: absolute;
  top: 0;
  right: 0;
  width: 34px;
  height: 34px;
  background:
    linear-gradient(225deg, rgba(255, 180, 84, 0.5) 0 1px, transparent 1px);
  pointer-events: none;
}

.page-about .about-cost__card h3 {
  font-size: clamp(1rem, 2.3vw, 1.15rem);
  font-weight: 700;
  line-height: 1.45;
}

.page-about .about-cost__card p {
  margin: 0;
  font-size: var(--fs-small);
  line-height: 1.75;
  color: rgba(196, 214, 226, 0.95);
  flex: 1 1 auto;
}

.page-about .about-cost__link {
  align-self: flex-start;
  font-family: var(--font-mono);
  font-size: var(--fs-small);
  color: var(--ice);
  text-decoration: none;
  border-bottom: 1px solid rgba(99, 216, 232, 0.45);
  padding-bottom: 1px;
  transition: color 160ms ease, border-color 160ms ease;
}

.page-about .about-cost__link:hover,
.page-about .about-cost__link:focus-visible {
  color: var(--signal);
  border-color: var(--signal);
}

/* 团队 */
.page-about .about-roles {
  list-style: none;
  margin: 1.4rem 0 1.2rem;
  padding: 0;
  display: grid;
  gap: 0.7rem;
  grid-template-columns: 1fr;
}

.page-about .about-roles__item {
  border: 1px solid var(--line-faint);
  border-left: 2px solid var(--ice);
  border-radius: var(--radius);
  padding: 0.75rem 0.9rem;
  background: rgba(12, 38, 59, 0.62);
}

.page-about .about-roles__name {
  margin: 0 0 0.2rem;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 0.9375rem;
  color: var(--paper);
}

.page-about .about-roles__desc {
  margin: 0;
  font-size: var(--fs-small);
  line-height: 1.7;
  color: var(--muted);
}

.page-about .about-team__security {
  font-size: var(--fs-small);
  color: rgba(168, 190, 207, 0.95);
  border-left: 2px solid var(--line);
  padding-left: 0.85rem;
}

/* 收尾 */
.page-about .about-cta {
  margin-top: clamp(2.25rem, 5vw, 3.75rem);
  border: 1px solid var(--line-soft);
  border-radius: var(--radius);
  background:
    radial-gradient(420px 220px at 92% 0%, rgba(182, 243, 90, 0.16), transparent 70%),
    linear-gradient(140deg, rgba(18, 59, 88, 0.92), rgba(7, 24, 38, 0.98));
  box-shadow: var(--lift);
  padding: clamp(1.35rem, 4vw, 2.5rem);
}

.page-about .about-cta__title {
  font-size: clamp(1.45rem, 3.6vw, 2rem);
  font-weight: 800;
  line-height: 1.25;
  margin-bottom: 0.6rem;
}

.page-about .about-cta__text {
  max-width: 56ch;
  color: rgba(244, 248, 250, 0.85);
}

.page-about .about-cta__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.6rem;
  margin-top: 1.2rem;
}

/* 中屏 */
@media (min-width: 640px) {
  .page-about .about-stats {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

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

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

/* 桌面非对称双栏 */
@media (min-width: 900px) {
  .page-about .about-hero {
    grid-template-columns: minmax(0, 7fr) minmax(0, 3fr);
    align-items: end;
  }

  .page-about .about-idea {
    grid-template-columns: minmax(0, 6fr) minmax(0, 5fr);
    align-items: start;
  }

  .page-about .about-idea__figure {
    margin-top: 1.6rem;
  }

  .page-about .about-section {
    grid-template-columns: minmax(0, 7fr) minmax(0, 3fr);
    align-items: start;
  }

  .page-about .about-section__note {
    position: sticky;
    top: 6.5rem;
  }

  .page-about .about-reach {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    align-items: start;
  }

  .page-about .about-reach__head {
    grid-column: 1 / -1;
  }

  .page-about .about-stats {
    align-content: start;
  }

  .page-about .about-reach__figure {
    grid-column: 2;
  }

  .page-about .about-stats {
    grid-column: 1;
  }

  .page-about .about-section__body {
    padding-right: 0.5rem;
  }
}

@media (min-width: 1100px) {
  .page-about .about-hero__lead {
    font-size: 1.0625rem;
  }

  .page-about .about-timeline {
    padding-left: 1.75rem;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-index__link,
  .page-about .about-stat,
  .page-about .about-timeline__item::before,
  .page-about .about-cost__link {
    transition: none;
  }

  .page-about .about-stat:hover,
  .page-about .about-stat:focus-visible {
    transform: none;
  }
}
<<<END>>>