.page-about {
  position: relative;
  background:
    radial-gradient(1100px 520px at 88% -8%, rgba(0,224,184,.13), transparent 62%),
    radial-gradient(760px 420px at -10% 22%, rgba(45,125,255,.12), transparent 60%),
    var(--navy);
  color: var(--ink);
  font-family: var(--font-body);
  line-height: 1.75;
  overflow-x: hidden;
}

.page-about .num {
  font-family: var(--font-num);
  font-weight: 700;
  letter-spacing: .02em;
}

/* 面包屑 */
.page-about .crumbs__list {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: .5rem;
  margin: 0;
  padding: 1.25rem 0 0;
  list-style: none;
  font-size: .82rem;
  letter-spacing: .06em;
}

.page-about .crumbs__link {
  color: var(--muted);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color var(--dur) ease, border-color var(--dur) ease;
}

.page-about .crumbs__link:hover,
.page-about .crumbs__link:focus-visible {
  color: var(--teal);
  border-bottom-color: var(--teal);
}

.page-about .crumbs__sep {
  color: var(--edge-strong);
}

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

/* 首屏 */
.page-about .about-hero {
  padding: clamp(1.25rem, 3vw, 2rem) 0 clamp(2.5rem, 6vw, 4.5rem);
}

.page-about .about-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 2rem;
}

.page-about .about-hero__copy {
  align-self: center;
}

.page-about .eyebrow {
  display: inline-block;
  margin: 0 0 .5rem;
  padding-bottom: .25rem;
  border-bottom: 2px solid var(--orange);
  color: var(--orange);
  font-family: var(--font-num);
  font-size: .76rem;
  font-weight: 700;
  letter-spacing: .22em;
}

.page-about h1 {
  margin: .4rem 0 1.1rem;
  font-family: var(--font-head);
  font-weight: 800;
  font-size: clamp(2.1rem, 6vw, 4.1rem);
  line-height: 1.04;
  letter-spacing: -.02em;
  color: var(--ice);
  text-wrap: balance;
}

.page-about h2 {
  margin: .35rem 0 .9rem;
  font-family: var(--font-head);
  font-weight: 800;
  font-size: clamp(1.6rem, 3.4vw, 2.6rem);
  line-height: 1.15;
  letter-spacing: -.01em;
  color: var(--ice);
}

.page-about h3 {
  font-family: var(--font-head);
  font-weight: 700;
  font-size: 1.12rem;
  line-height: 1.4;
  margin: 0 0 .4rem;
  color: var(--ice);
}

.page-about p {
  margin: 0 0 1rem;
  color: var(--muted);
  max-width: 66ch;
}

.page-about .lede {
  font-size: clamp(1rem, 1.6vw, 1.15rem);
  line-height: 1.85;
  color: rgba(230,244,255,.82);
  max-width: 60ch;
}

.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: .75rem;
  margin-top: 1.5rem;
}

.page-about .btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: .4rem;
  padding: .78rem 1.4rem;
  font-family: var(--font-head);
  font-weight: 700;
  font-size: .95rem;
  text-decoration: none;
  border: 2px solid transparent;
  transition: transform var(--dur) ease, box-shadow var(--dur) ease, color var(--dur) ease, border-color var(--dur) ease;
}

.page-about .btn--primary {
  background: var(--orange);
  color: #0A1622;
  box-shadow: 5px 5px 0 0 rgba(2,10,20,.6);
}

.page-about .btn--primary:hover,
.page-about .btn--primary:focus-visible {
  transform: translate(-2px, -2px);
  box-shadow: 8px 8px 0 0 rgba(2,10,20,.6);
}

.page-about .btn--outline {
  background: transparent;
  color: var(--ice);
  border-color: var(--edge-strong);
}

.page-about .btn--outline:hover,
.page-about .btn--outline:focus-visible {
  color: var(--teal);
  border-color: var(--teal);
}

.page-about .about-hero__stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1.1rem 1.25rem;
  margin: 2rem 0 0;
  padding: 1.4rem 0 0;
  border-top: 1px solid var(--edge);
  list-style: none;
}

.page-about .stat {
  border-left: 3px solid var(--orange);
  padding-left: .85rem;
}

.page-about .stat__value {
  display: block;
  font-family: var(--font-num);
  font-weight: 700;
  font-size: clamp(1.7rem, 3.2vw, 2.4rem);
  line-height: 1;
  color: var(--teal);
  transform: skewX(-4deg);
}

.page-about .stat__label {
  display: block;
  margin-top: .4rem;
  font-size: .82rem;
  line-height: 1.5;
  color: var(--muted);
}

.page-about .stat--orange {
  border-left-color: var(--blue);
}

.page-about .stat--orange .stat__value {
  color: var(--orange);
}

/* 图片框架 */
.page-about .media-frame {
  position: relative;
  margin: 0;
  border: 3px solid var(--edge-strong);
  background: linear-gradient(135deg, rgba(14,42,74,.95), rgba(7,27,51,.95));
  box-shadow: var(--shadow-hard);
  overflow: hidden;
}

.page-about .media-frame--3x2 { aspect-ratio: 3 / 2; }
.page-about .media-frame--4x3 { aspect-ratio: 4 / 3; }

.page-about .media-frame--tilt {
  transform: rotate(-1deg);
}

.page-about .media-frame__inner {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.page-about .media-frame__caption {
  display: block;
  margin-top: .75rem;
  font-size: .82rem;
  line-height: 1.6;
  color: var(--graphite);
}

.page-about .about-hero__figure {
  margin: 0;
  padding: .25rem .5rem .25rem .25rem;
}

.page-about .about-hero__figure .media-frame__caption {
  color: var(--muted);
}

/* 主体两栏 */
.page-about .about-body {
  padding-top: clamp(2rem, 5vw, 3.5rem);
  padding-bottom: clamp(3rem, 7vw, 5rem);
}

.page-about .about-rail {
  align-self: start;
}

.page-about .toc {
  border: 2px solid var(--edge-strong);
  background: linear-gradient(180deg, rgba(14,42,74,.9), rgba(7,27,51,.9));
  padding: 1.1rem 1rem;
}

.page-about .toc__title {
  margin: 0 0 .75rem;
  font-family: var(--font-num);
  font-size: .76rem;
  font-weight: 700;
  letter-spacing: .2em;
  color: var(--teal);
}

.page-about .toc__list,
.page-about .year-index__list {
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .toc__link {
  display: block;
  padding: .45rem .6rem;
  border-left: 2px solid transparent;
  color: var(--muted);
  font-size: .92rem;
  text-decoration: none;
  transition: color var(--dur) ease, border-color var(--dur) ease, background var(--dur) ease;
}

.page-about .toc__link:hover,
.page-about .toc__link:focus-visible {
  color: var(--ice);
  border-left-color: var(--teal);
  background: rgba(0,224,184,.07);
}

.page-about .toc__link[aria-current="true"] {
  color: var(--ice);
  border-left-color: var(--orange);
  background: rgba(255,107,44,.1);
}

.page-about .year-index {
  margin-top: 1.5rem;
  border-top: 1px dashed var(--edge-strong);
  padding-top: 1rem;
}

.page-about .year-index__title {
  margin: 0 0 .6rem;
  font-family: var(--font-num);
  font-size: .76rem;
  font-weight: 700;
  letter-spacing: .2em;
  color: var(--amber);
}

.page-about .year-index__link {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: .5rem;
  padding: .35rem .2rem;
  border-bottom: 1px solid var(--edge);
  color: var(--ice);
  font-size: .88rem;
  text-decoration: none;
  transition: color var(--dur) ease, border-color var(--dur) ease;
}

.page-about .year-index__link .num {
  font-size: 1.15rem;
  color: var(--blue);
}

.page-about .year-index__link:hover,
.page-about .year-index__link:focus-visible {
  color: var(--teal);
  border-bottom-color: var(--teal);
}

.page-about .year-index__link:hover .num,
.page-about .year-index__link:focus-visible .num {
  color: var(--teal);
}

/* 内容块 */
.page-about .about-block {
  border-top: 3px solid var(--edge-strong);
  padding-top: 1.5rem;
}

.page-about .about-block + .about-block {
  margin-top: clamp(3rem, 7vw, 5rem);
}

.page-about .about-block,
.page-about .timeline__item {
  scroll-margin-top: calc(var(--header-h) + 1.5rem);
}

.page-about .about-block--paper {
  border: 3px solid var(--edge-strong);
  background: var(--paper);
  padding: clamp(1.4rem, 3.6vw, 2.6rem);
  box-shadow: var(--shadow-hard);
}

.page-about .about-block--paper h2,
.page-about .about-block--paper h3 {
  color: var(--navy);
}

.page-about .about-block--paper p,
.page-about .about-block--paper .lede {
  color: #3D4E63;
}

/* 键值列表 */
.page-about .data-list {
  margin: 1.5rem 0 0;
  padding: 0;
  border-top: 1px solid var(--edge);
  list-style: none;
}

.page-about .data-list__row {
  display: grid;
  grid-template-columns: 1fr;
  gap: .2rem;
  padding: .85rem 0;
  border-bottom: 1px solid var(--edge);
}

.page-about .data-list__term {
  font-family: var(--font-head);
  font-weight: 700;
  font-size: .95rem;
  color: var(--ice);
}

.page-about .data-list__desc {
  color: var(--muted);
  font-size: .95rem;
  line-height: 1.7;
}

/* 服务版图 */
.page-about .coverage-stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1.25rem;
  margin: 1.75rem 0 1.5rem;
  padding: 0;
  list-style: none;
}

.page-about .coverage-tags {
  display: flex;
  flex-wrap: wrap;
  gap: .5rem;
  margin-bottom: 1.5rem;
}

.page-about .tag {
  display: inline-block;
  padding: .32rem .75rem;
  border: 2px solid var(--teal);
  color: var(--teal);
  font-family: var(--font-num);
  font-size: .82rem;
  font-weight: 700;
  letter-spacing: .06em;
}

.page-about .tag--orange {
  border-color: var(--orange);
  color: var(--orange);
}

.page-about .tag--blue {
  border-color: var(--blue);
  color: var(--blue);
}

.page-about .tag--amber {
  border-color: var(--amber);
  color: var(--amber);
}

.page-about .coverage-figure,
.page-about .team-figure {
  margin: 2rem 0 0;
}

/* 团队 */
.page-about .team-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1rem;
  margin-top: 1.75rem;
}

.page-about .card {
  border: 2px solid var(--edge-strong);
  background: linear-gradient(160deg, rgba(14,42,74,.95), rgba(9,32,56,.95));
  padding: 1.15rem 1.1rem;
  box-shadow: 6px 6px 0 0 rgba(2,10,20,.5);
  transition: transform var(--dur) ease, border-color var(--dur) ease;
}

.page-about .card:hover {
  transform: translate(-3px, -3px);
  border-color: var(--teal);
}

.page-about .card__meta {
  margin: 0 0 .5rem;
  font-family: var(--font-num);
  font-size: .85rem;
  font-weight: 700;
  letter-spacing: .16em;
  color: var(--orange);
}

.page-about .card__title {
  margin: 0 0 .45rem;
}

.page-about .card p {
  margin: 0;
  font-size: .93rem;
  line-height: 1.7;
}

.page-about .note {
  margin: 1.75rem 0 0;
  padding: .95rem 1.1rem;
  border-left: 4px solid var(--amber);
  background: rgba(242,181,68,.1);
  color: rgba(230,244,255,.86);
  font-size: .93rem;
  line-height: 1.7;
}

/* 质量与安全 */
.page-about .trust-list {
  margin: 1.75rem 0 0;
  padding: 0;
  list-style: none;
}

.page-about .trust-list__item {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 1rem;
  align-items: start;
  padding: 1.1rem 0;
  border-top: 1px solid var(--line);
}

.page-about .trust-list__key {
  font-family: var(--font-num);
  font-size: clamp(1.8rem, 4vw, 2.6rem);
  font-weight: 700;
  line-height: .95;
  color: var(--blue);
  min-width: 3.6rem;
}

.page-about .trust-list__body h3 {
  margin: 0 0 .35rem;
  font-size: 1.05rem;
}

.page-about .trust-list__body p {
  margin: 0;
  font-size: .93rem;
  line-height: 1.7;
  max-width: 56ch;
}

.page-about .trust-foot {
  margin: 1.5rem 0 0;
  padding-top: 1.1rem;
  border-top: 3px solid var(--navy);
  font-size: .95rem;
  max-width: 60ch;
}

/* 发展历程 */
.page-about .pulse-line {
  display: block;
  width: min(420px, 100%);
  height: auto;
  margin: .25rem 0 0;
  color: var(--teal);
  opacity: .85;
}

.page-about .timeline {
  position: relative;
  margin: 1.75rem 0 0;
  padding: 0 0 0 2.4rem;
  list-style: none;
}

.page-about .timeline::before {
  content: "";
  position: absolute;
  left: 7px;
  top: .5rem;
  bottom: .5rem;
  width: 4px;
  background: linear-gradient(180deg, var(--teal), var(--blue) 52%, var(--orange));
}

.page-about .timeline__item {
  position: relative;
  padding-bottom: 2rem;
}

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

.page-about .timeline__item::before {
  content: "";
  position: absolute;
  left: -2.4rem;
  top: .55rem;
  width: 14px;
  height: 14px;
  background: var(--navy);
  border: 3px solid var(--teal);
  transform: rotate(45deg);
}

.page-about .timeline__item:last-child::before {
  border-color: var(--orange);
}

.page-about .timeline__year {
  margin: 0;
  font-family: var(--font-num);
  font-size: clamp(1.6rem, 3.4vw, 2.2rem);
  font-weight: 700;
  line-height: 1;
  color: var(--orange);
}

.page-about .timeline__title {
  margin: .45rem 0 .4rem;
}

.page-about .timeline__desc {
  margin: 0;
  font-size: .95rem;
  line-height: 1.75;
  max-width: 58ch;
}

/* 结尾引导 */
.page-about .about-cta {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.25rem;
  margin-top: clamp(3rem, 7vw, 5rem);
  padding: clamp(1.5rem, 4vw, 2.6rem);
  border: 3px solid var(--edge-strong);
  background: linear-gradient(120deg, rgba(45,125,255,.18), rgba(0,224,184,.12) 60%, rgba(255,107,44,.12));
  box-shadow: var(--shadow-hard);
}

.page-about .about-cta h2 {
  font-size: clamp(1.4rem, 2.6vw, 2rem);
  margin: 0 0 .6rem;
}

.page-about .about-cta p {
  margin: 0;
  font-size: .95rem;
  max-width: 52ch;
}

.page-about .about-cta__actions {
  display: flex;
  flex-wrap: wrap;
  gap: .75rem;
  align-self: center;
}

/* 动效 */
.has-js .page-about [data-reveal] {
  opacity: 0;
  transform: translateY(16px);
  transition: opacity 420ms ease, transform 420ms ease;
}

.has-js .page-about [data-reveal].is-visible {
  opacity: 1;
  transform: none;
}

@media (prefers-reduced-motion: reduce) {
  .page-about .media-frame--tilt,
  .page-about .stat__value {
    transform: none;
  }

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

/* 平板及以上 */
@media (min-width: 720px) {
  .page-about .about-hero__stats {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .page-about .data-list__row {
    grid-template-columns: minmax(140px, 210px) 1fr;
    gap: 1rem;
    align-items: baseline;
  }

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

  .page-about h1 {
    transform: skewX(-1.6deg);
  }
}

/* 桌面：编辑部两栏与三段栅格 */
@media (min-width: 1024px) {
  .page-about .about-grid--hero {
    grid-template-columns: minmax(0, 1.02fr) minmax(0, 1fr);
    gap: clamp(2rem, 5vw, 4.5rem);
    align-items: center;
  }

  .page-about .about-grid--body {
    grid-template-columns: minmax(190px, 240px) minmax(0, 1fr);
    gap: clamp(2rem, 4vw, 3.75rem);
  }

  .page-about .about-rail {
    position: sticky;
    top: calc(var(--header-h) + 1.5rem);
  }

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

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

  .page-about .about-cta {
    grid-template-columns: minmax(0, 1.5fr) auto;
    align-items: center;
  }
}
<<<END>>>