.page-about {
  --about-pad: clamp(2.75rem, 7vw, 6rem);
  --about-accent: #0E7C74;
  --about-ink-line: rgba(16, 36, 51, 0.16);
  --about-paper-soft: rgba(244, 239, 228, 0.82);
  display: block;
  overflow-x: hidden;
}

/* 首屏 */
.page-about .about-hero {
  background:
    radial-gradient(120% 90% at 88% 8%, rgba(49, 224, 208, 0.14), transparent 58%),
    radial-gradient(80% 70% at 6% 96%, rgba(231, 183, 92, 0.1), transparent 62%),
    var(--ink);
  color: var(--paper);
  padding: clamp(2rem, 6vw, 4.5rem) 0 clamp(2.5rem, 6vw, 5rem);
}

.page-about .about-hero__grid {
  display: grid;
  gap: clamp(2rem, 4vw, 3.5rem);
  grid-template-columns: minmax(0, 1fr);
}

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

.page-about .breadcrumb__list {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
  list-style: none;
  margin: 0 0 1.6rem;
  padding: 0;
  font-size: 0.8125rem;
  color: var(--mist);
}

.page-about .breadcrumb__item + .breadcrumb__item::before {
  content: "/";
  margin-right: 0.4rem;
  opacity: 0.55;
}

.page-about .breadcrumb__link {
  color: var(--mist);
  text-decoration: none;
}

.page-about .breadcrumb__link:hover,
.page-about .breadcrumb__link:focus-visible {
  color: var(--cyan);
}

.page-about .breadcrumb__current {
  color: var(--paper);
}

.page-about .about-hero .eyebrow {
  display: inline-flex;
  align-items: baseline;
  gap: 0.5rem;
  margin: 0 0 1rem;
  font-size: 0.8125rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--gold);
}

.page-about .about-hero__title {
  margin: 0 0 1.25rem;
  font-family: var(--font-display);
  font-size: clamp(2.1rem, 6.4vw, 4.25rem);
  line-height: 1.02;
  letter-spacing: 0.01em;
  color: var(--paper);
  max-width: 20ch;
}

.page-about .about-hero__dek {
  margin: 0 0 1.9rem;
  max-width: 46ch;
  font-size: clamp(0.9688rem, 2.2vw, 1.0625rem);
  line-height: 1.9;
  color: var(--about-paper-soft);
}

.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.7rem;
}

.page-about .about-hero__actions .btn {
  text-decoration: none;
}

/* 首屏展签板 */
.page-about .about-hero__plate {
  border-radius: var(--r-xl);
  padding: clamp(1.25rem, 3vw, 1.9rem);
  box-shadow: 0 24px 60px rgba(0, 0, 0, 0.28);
}

.page-about .about-plate__cap {
  margin: 0 0 1rem;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--about-accent);
}

.page-about .about-plate__row {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 1rem;
  padding: 0.72rem 0;
  border-bottom: 1px dashed var(--about-ink-line);
}

.page-about .about-plate__key {
  font-size: 0.875rem;
  color: rgba(16, 36, 51, 0.72);
}

.page-about .about-plate__val {
  font-size: 1.0625rem;
  font-weight: 700;
  color: var(--type-ink);
  white-space: nowrap;
}

.page-about .about-plate__note {
  margin: 1rem 0 0;
  font-size: 0.8125rem;
  line-height: 1.7;
  color: rgba(16, 36, 51, 0.66);
}

/* 章节导航 */
.page-about .about-toc {
  background: var(--ink-2);
  border-top: 1px solid var(--hair);
  border-bottom: 1px solid var(--hair);
  padding: 0.75rem 0;
}

.page-about .about-toc__inner {
  display: flex;
  align-items: center;
  gap: 0.9rem;
  min-width: 0;
}

.page-about .about-toc__label {
  flex: 0 0 auto;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.16em;
  color: var(--mist);
}

.page-about .about-toc__list {
  display: flex;
  gap: 0.5rem;
  list-style: none;
  margin: 0;
  padding: 0 0 0.2rem;
  overflow-x: auto;
  scrollbar-width: thin;
  min-width: 0;
}

.page-about .about-toc__link {
  display: inline-block;
  padding: 0.4rem 0.9rem;
  white-space: nowrap;
  text-decoration: none;
  color: var(--mist);
  border: 1px solid var(--hair);
  border-radius: var(--pill);
  background: transparent;
  transition: color 0.18s var(--ease), border-color 0.18s var(--ease), background-color 0.18s var(--ease);
}

.page-about .about-toc__link:hover,
.page-about .about-toc__link:focus-visible {
  color: var(--ink);
  background: var(--cyan);
  border-color: var(--cyan);
  outline: none;
}

/* 章节通用 */
.page-about .about-sec {
  padding: var(--about-pad) 0;
}

.page-about .about-sec--paper {
  background: var(--paper);
  color: var(--type-ink);
}

.page-about .about-sec--ink {
  background: var(--ink);
  color: var(--paper);
}

.page-about .about-sec--night {
  background: var(--ink-2);
  color: var(--paper);
}

.page-about .about-sec__grid {
  display: grid;
  gap: clamp(1.25rem, 4vw, 2.75rem);
  grid-template-columns: minmax(0, 1fr);
}

.page-about .about-sec__no {
  margin: 0;
  font-family: var(--font-mono);
  font-size: clamp(1.75rem, 5vw, 3rem);
  line-height: 1;
  color: var(--gold);
  opacity: 0.85;
}

.page-about .about-sec--paper .about-sec__no {
  color: var(--about-accent);
  opacity: 0.75;
}

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

.page-about .about-sec__body .section-head__title {
  margin: 0 0 1.15rem;
  font-family: var(--font-display);
  font-size: clamp(1.5rem, 4vw, 2.35rem);
  line-height: 1.18;
  letter-spacing: 0.01em;
  color: inherit;
  max-width: 24ch;
}

.page-about .about-sec__body p {
  margin: 0 0 1.05rem;
  max-width: 64ch;
  font-size: 1rem;
  line-height: 1.9;
  color: inherit;
}

.page-about .about-sec--ink .about-sec__body p,
.page-about .about-sec--night .about-sec__body p {
  color: var(--about-paper-soft);
}

.page-about .about-sec--paper .about-sec__body p {
  color: rgba(16, 36, 51, 0.86);
}

/* 数据条 */
.page-about .about-figures {
  display: grid;
  gap: 1rem;
  grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
  margin: 1.9rem 0 0;
}

.page-about .about-figures__item {
  border-top: 2px solid var(--about-accent);
  padding-top: 0.85rem;
}

.page-about .about-figures__num {
  margin: 0 0 0.3rem;
  font-family: var(--font-mono);
  font-size: clamp(1.5rem, 4vw, 2.2rem);
  line-height: 1.05;
  color: var(--about-accent);
}

.page-about .about-figures__label {
  margin: 0;
  font-size: 0.8125rem;
  letter-spacing: 0.04em;
  color: rgba(16, 36, 51, 0.7);
}

/* 图片 */
.page-about .about-figure {
  margin: 2rem 0 0;
}

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

.page-about .about-figure__cap {
  margin: 0.7rem 0 0;
  font-size: 0.8125rem;
  line-height: 1.65;
  color: inherit;
  opacity: 0.7;
}

.page-about .about-figure--narrow {
  max-width: 720px;
}

/* 三道工序 */
.page-about .about-steps {
  display: grid;
  gap: 1.1rem;
  grid-template-columns: minmax(0, 1fr);
  margin: 1.9rem 0 0;
}

.page-about .about-step {
  position: relative;
  border: 1px solid var(--hair);
  border-radius: var(--r-l);
  background: rgba(7, 26, 43, 0.55);
  padding: 1.3rem 1.25rem 1.35rem;
  transition: border-color 0.2s var(--ease), transform 0.2s var(--ease), background-color 0.2s var(--ease);
}

.page-about .about-step:hover {
  border-color: var(--hair-strong);
  background: rgba(14, 42, 61, 0.85);
  transform: translateY(-2px);
}

.page-about .about-step__no {
  margin: 0 0 0.6rem;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.16em;
  color: var(--cyan);
}

.page-about .about-step__badge {
  display: inline-block;
  margin: 0 0 0.8rem;
  padding: 0.28rem 0.85rem;
  border-radius: var(--pill);
  background: rgba(49, 224, 208, 0.14);
  color: var(--mist);
  font-size: 0.875rem;
  font-weight: 700;
  letter-spacing: 0.04em;
}

.page-about .about-step__text {
  margin: 0;
  font-size: 0.9375rem;
  line-height: 1.85;
  color: var(--about-paper-soft);
}

/* 团队带状 */
.page-about .about-team {
  display: grid;
  gap: 1px;
  grid-template-columns: minmax(0, 1fr);
  margin: 1.9rem 0 0;
  border-radius: var(--r-l);
  overflow: hidden;
  background: var(--hair);
}

.page-about .about-team__cell {
  background: var(--ink);
  padding: clamp(1.25rem, 3vw, 1.9rem);
}

.page-about .about-team__num {
  margin: 0 0 0.25rem;
  font-family: var(--font-mono);
  font-size: clamp(2.2rem, 6vw, 3.4rem);
  line-height: 1;
  color: var(--cyan);
}

.page-about .about-team__role {
  margin: 0 0 0.7rem;
  font-size: 1rem;
  font-weight: 700;
  letter-spacing: 0.06em;
  color: var(--gold);
}

.page-about .about-team__text {
  margin: 0;
  font-size: 0.9375rem;
  line-height: 1.85;
  color: var(--about-paper-soft);
}

.page-about .about-team__foot {
  margin: 1.6rem 0 0;
  max-width: 62ch;
}

/* 年表 */
.page-about .about-years {
  list-style: none;
  margin: 1.9rem 0 0;
  padding: 0 0 0 1.5rem;
  border-left: 1px solid var(--about-ink-line);
}

.page-about .about-years__item {
  position: relative;
  padding-bottom: 1.9rem;
}

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

.page-about .about-years__item::before {
  content: "";
  position: absolute;
  left: calc(-1.5rem - 6px);
  top: 0.42rem;
  width: 11px;
  height: 11px;
  border-radius: 50%;
  background: var(--paper);
  border: 2px solid var(--about-accent);
  transition: background-color 0.2s var(--ease), box-shadow 0.2s var(--ease);
}

.page-about .about-years__item:hover::before {
  background: var(--about-accent);
  box-shadow: 0 0 0 5px rgba(14, 124, 116, 0.16);
}

.page-about .about-years__year {
  margin: 0 0 0.3rem;
  font-family: var(--font-mono);
  font-size: 1.15rem;
  letter-spacing: 0.08em;
  color: var(--about-accent);
  transition: color 0.2s var(--ease);
}

.page-about .about-years__title {
  margin: 0 0 0.45rem;
  font-size: 1.0625rem;
  font-weight: 700;
  color: var(--type-ink);
}

.page-about .about-years__note {
  margin: 0;
  max-width: 60ch;
  font-size: 0.9375rem;
  line-height: 1.85;
  color: rgba(16, 36, 51, 0.78);
}

.page-about .about-system__tail {
  margin-top: 1.7rem !important;
  padding-top: 1.3rem;
  border-top: 1px solid var(--about-ink-line);
}

/* 本地与备案 */
.page-about .about-local {
  display: grid;
  gap: clamp(1.6rem, 4vw, 2.6rem);
  grid-template-columns: minmax(0, 1fr);
  align-items: center;
}

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

.page-about .about-local .eyebrow {
  display: inline-flex;
  align-items: baseline;
  gap: 0.5rem;
  margin: 0 0 0.9rem;
  font-size: 0.8125rem;
  letter-spacing: 0.16em;
  color: var(--gold);
}

.page-about .about-local .section-head__title {
  margin: 0 0 1rem;
  font-family: var(--font-display);
  font-size: clamp(1.5rem, 4vw, 2.35rem);
  line-height: 1.18;
  color: var(--paper);
}

.page-about .about-local__text p {
  margin: 0 0 1rem;
  max-width: 58ch;
  font-size: 1rem;
  line-height: 1.9;
  color: var(--about-paper-soft);
}

.page-about .about-local__icp {
  color: var(--mist);
  border-bottom: 1px solid var(--hair-strong);
  padding-bottom: 1px;
}

.page-about .about-local__actions {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 1rem 1.4rem;
  margin-top: 1.4rem;
}

.page-about .about-local__actions .btn {
  text-decoration: none;
}

.page-about .about-local__link {
  font-size: 0.9375rem;
  color: var(--mist);
  text-decoration: none;
}

.page-about .about-local__link:hover,
.page-about .about-local__link:focus-visible {
  color: var(--cyan);
}

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

/* 收尾 */
.page-about .about-cta {
  background: var(--paper);
  color: var(--type-ink);
  padding: var(--about-pad) 0;
  border-top: 1px solid var(--paper-line);
}

.page-about .about-cta__inner {
  display: grid;
  gap: 1.6rem;
  grid-template-columns: minmax(0, 1fr);
  align-items: center;
}

.page-about .about-cta__title {
  margin: 0 0 0.7rem;
  font-family: var(--font-display);
  font-size: clamp(1.6rem, 4.2vw, 2.5rem);
  line-height: 1.15;
  color: var(--type-ink);
  max-width: 22ch;
}

.page-about .about-cta__text p {
  margin: 0;
  max-width: 54ch;
  font-size: 1rem;
  line-height: 1.85;
  color: rgba(16, 36, 51, 0.8);
}

.page-about .about-cta__links {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.8rem 1.2rem;
}

.page-about .about-cta__links .btn {
  text-decoration: none;
}

.page-about .about-cta__ghost {
  border-color: var(--about-ink-line);
  color: var(--type-ink);
}

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

.page-about .about-cta__link {
  font-size: 0.9375rem;
  color: var(--about-accent);
  text-decoration: none;
}

/* 焦点可见性 */
.page-about a:focus-visible {
  outline: 2px solid var(--cyan);
  outline-offset: 3px;
}

.page-about .about-cta a:focus-visible {
  outline-color: var(--about-accent);
}

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

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

@media (min-width: 900px) {
  .page-about .about-hero__grid {
    grid-template-columns: 1.35fr 0.9fr;
    align-items: end;
  }

  .page-about .about-toc {
    position: sticky;
    top: 0;
    z-index: 20;
  }

  .page-about .about-sec__grid {
    grid-template-columns: 5.5rem minmax(0, 1fr);
    gap: clamp(1.5rem, 3vw, 3rem);
  }

  .page-about .about-local {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, 0.95fr);
  }

  .page-about .about-cta__inner {
    grid-template-columns: minmax(0, 1.1fr) auto;
    gap: 2.5rem;
  }

  .page-about .about-step:not(:last-child)::after {
    content: "";
    position: absolute;
    top: 3.55rem;
    right: -1.1rem;
    width: 1.1rem;
    height: 1px;
    background: linear-gradient(90deg, var(--cyan), rgba(49, 224, 208, 0));
  }

  .page-about .about-hero__title {
    max-width: 18ch;
  }
}

@media (min-width: 1120px) {
  .page-about .about-sec__grid {
    grid-template-columns: 6.5rem minmax(0, 1fr);
  }
}
<<<END>>>