.page-about {
  background: var(--indigo-900);
  color: var(--paper);
  overflow-x: clip;
}

/* ============ 首屏声明区 ============ */
.page-about .about-lede {
  position: relative;
  border-bottom: 1px solid var(--line-dark);
  background: linear-gradient(158deg, var(--indigo-800) 0%, var(--indigo-900) 62%);
}

.page-about .about-lede__inner {
  display: grid;
  gap: clamp(26px, 4vw, 44px);
  padding: clamp(26px, 4.5vw, 56px) 0 clamp(30px, 5vw, 68px);
}

.page-about .about-lede__main {
  max-width: 74ch;
}

.page-about .about-lede .eyebrow {
  color: var(--lime);
  margin: clamp(18px, 2.6vw, 30px) 0 10px;
}

.page-about .about-lede__lead {
  margin-top: clamp(16px, 2.2vw, 24px);
  color: var(--paper);
  border-left: 2px solid var(--lime);
  padding-left: clamp(14px, 1.6vw, 20px);
}

.page-about .scope-facts {
  margin: 0;
  border: 1px solid var(--line-dark);
  background: rgba(20, 27, 58, 0.62);
}

.page-about .scope-facts__row {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 16px;
  padding: 11px 14px;
  border-bottom: 1px solid var(--line-soft);
}

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

.page-about .scope-facts dt {
  font-family: var(--font-body);
  font-size: 13px;
  letter-spacing: 0.06em;
  color: var(--muted);
}

.page-about .scope-facts dd {
  margin: 0;
  font-size: 15px;
  color: var(--lime);
  letter-spacing: 0.04em;
  font-variant-numeric: tabular-nums;
}

.page-about .about-toc {
  border-top: 1px solid var(--line-dark);
  padding-top: clamp(14px, 2vw, 20px);
}

.page-about .about-toc__label {
  color: var(--muted);
  margin: 0 0 10px;
}

.page-about .about-toc__list {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 22px;
  list-style: none;
  margin: 0;
  padding: 0;
}

.page-about .about-toc__list a {
  display: inline-flex;
  align-items: baseline;
  gap: 8px;
  font-family: var(--font-head);
  font-size: 14px;
  letter-spacing: 0.06em;
  color: var(--paper);
  text-decoration: none;
  padding: 4px 0;
  border-bottom: 1px solid transparent;
  transition: color var(--dur) var(--ease), border-color var(--dur) var(--ease);
}

.page-about .about-toc__list a .mono {
  color: var(--lime-deep);
  font-size: 12px;
}

.page-about .about-toc__list a:hover,
.page-about .about-toc__list a:focus-visible {
  color: var(--lime);
  border-bottom-color: var(--lime);
}

.page-about .about-toc__list a:focus-visible {
  outline: 2px solid var(--lime);
  outline-offset: 3px;
}

/* ============ 通用区块 ============ */
.page-about .about-block {
  padding: clamp(46px, 6.5vw, 96px) 0;
  border-top: 1px solid var(--line-dark);
}

.page-about .about-scope {
  border-top: 0;
}

.page-about .about-head {
  max-width: 68ch;
}

.page-about .about-head--wide {
  max-width: 82ch;
}

.page-about .about-head__no {
  color: var(--lime);
  margin: 0 0 12px;
}

.page-about .about-head__lead {
  margin-top: 14px;
  color: var(--muted);
}

/* ============ 01 核定边界 ============ */
.page-about .about-scope__grid {
  display: grid;
  gap: clamp(28px, 4.5vw, 56px);
}

.page-about .scope-list {
  margin: 0;
}

.page-about .scope-row {
  display: grid;
  gap: 6px;
  padding: 16px 0;
  border-top: 1px solid var(--line-soft);
}

.page-about .scope-row:last-child {
  border-bottom: 1px solid var(--line-soft);
}

.page-about .scope-row__term {
  font-family: var(--font-head);
  font-size: 15px;
  letter-spacing: 0.1em;
  color: var(--ambers, var(--amber));
}

.page-about .scope-row__def {
  margin: 0;
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.78;
  color: var(--paper);
}

/* ============ 02 口径版本 ============ */
.page-about .about-figure {
  margin: clamp(26px, 4vw, 46px) 0;
  border: 1px solid var(--line-dark);
  background: var(--indigo-800);
}

.page-about .about-figure img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
}

.page-about .media-frame__caption {
  display: block;
  padding: 10px 14px;
  font-family: var(--font-body);
  font-size: 12.5px;
  line-height: 1.7;
  letter-spacing: 0.02em;
  color: var(--muted);
  border-top: 1px solid var(--line-soft);
}

.page-about .version-track {
  list-style: none;
  margin: 0;
  padding: 0;
}

.page-about .version-node {
  position: relative;
  margin-left: 5px;
  padding-left: 30px;
  padding-bottom: clamp(30px, 4.2vw, 54px);
  border-left: 1px solid var(--line-dark);
}

.page-about .version-node:last-child {
  padding-bottom: 0;
  border-left-color: transparent;
}

.page-about .version-node__marker {
  position: relative;
}

.page-about .version-node__marker::before {
  content: "";
  position: absolute;
  left: -36px;
  top: 5px;
  width: 11px;
  height: 11px;
  transform: translateX(-50%);
  border-radius: 50%;
  background: var(--amber);
  box-shadow: 0 0 0 4px var(--indigo-900);
  transition: background var(--dur) var(--ease), box-shadow var(--dur) var(--ease);
}

.page-about .version-node:last-child .version-node__marker::before {
  background: var(--lime);
  box-shadow: 0 0 0 4px var(--indigo-900), 0 0 12px rgba(198, 242, 78, 0.55);
}

.page-about .version-node__id {
  display: inline-block;
  font-size: 20px;
  letter-spacing: 0.08em;
  color: var(--amber);
  font-variant-numeric: tabular-nums;
}

.page-about .version-node:last-child .version-node__id {
  color: var(--lime);
}

.page-about .version-node__era {
  margin: 10px 0 6px;
  color: var(--muted);
}

.page-about .version-node__body h3 {
  margin: 0 0 10px;
}

.page-about .version-node__text {
  margin: 0 0 16px;
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.78;
  color: var(--paper);
  max-width: 68ch;
}

.page-about .disclosure {
  border: 1px solid var(--line-dark);
  background: rgba(20, 27, 58, 0.5);
}

.page-about .disclosure__trigger {
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 14px;
  padding: 12px 14px;
  background: transparent;
  border: 0;
  color: var(--lime);
  font-family: var(--font-head);
  font-size: 13.5px;
  letter-spacing: 0.08em;
  text-align: left;
  cursor: pointer;
  transition: color var(--dur) var(--ease), background var(--dur) var(--ease);
}

.page-about .disclosure__trigger:hover,
.page-about .disclosure__trigger[aria-expanded="true"] {
  color: var(--amber);
  background: rgba(255, 196, 102, 0.06);
}

.page-about .disclosure__trigger:focus-visible {
  outline: 2px solid var(--lime);
  outline-offset: -2px;
}

.page-about .disclosure__inner {
  padding: 4px 14px 16px;
}

.page-about .change-list {
  margin: 0;
  padding-left: 18px;
  list-style: none;
}

.page-about .change-list li {
  position: relative;
  font-family: var(--font-body);
  font-size: 15px;
  line-height: 1.78;
  color: var(--paper);
  padding: 6px 0 6px 14px;
  border-top: 1px solid var(--line-soft);
}

.page-about .change-list li:first-child {
  border-top: 0;
}

.page-about .change-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 16px;
  width: 6px;
  height: 1px;
  background: var(--lime-deep);
}

/* ============ 03 三级复核 ============ */
.page-about .about-review__grid {
  display: grid;
  gap: clamp(28px, 4.5vw, 56px);
}

.page-about .review-steps {
  list-style: none;
  margin: clamp(26px, 3.5vw, 42px) 0 0;
  padding: 0;
  counter-reset: review;
}

.page-about .review-step {
  padding: clamp(18px, 2.4vw, 26px) 0;
  border-top: 1px solid var(--line-dark);
  transition: background var(--dur) var(--ease);
}

.page-about .review-step:last-child {
  border-bottom: 1px solid var(--line-dark);
}

.page-about .review-step:hover {
  background: rgba(198, 242, 78, 0.04);
}

.page-about .review-step__top {
  display: flex;
  align-items: baseline;
  flex-wrap: wrap;
  gap: 8px 14px;
}

.page-about .review-step__no {
  font-size: 13px;
  letter-spacing: 0.1em;
  color: var(--muted);
}

.page-about .review-step__name {
  margin: 0;
  font-family: var(--font-head);
  font-size: 20px;
  font-weight: 600;
  letter-spacing: 0.06em;
  color: var(--paper);
}

.page-about .review-step__scope {
  margin-left: auto;
  color: var(--muted);
}

.page-about .review-step__bar {
  margin: 14px 0 12px;
  background: var(--line-soft);
}

.page-about .review-step__bar span {
  display: block;
  height: 100%;
  width: 100%;
  transform-origin: left center;
  transition: width var(--dur) var(--ease);
}

.page-about .review-step--1 .review-step__bar {
  height: 8px;
}

.page-about .review-step--1 .review-step__bar span {
  background: var(--lime);
}

.page-about .review-step--2 .review-step__bar {
  height: 12px;
}

.page-about .review-step--2 .review-step__bar span {
  width: 84%;
  background: var(--amber);
}

.page-about .review-step--3 .review-step__bar {
  height: 16px;
}

.page-about .review-step--3 .review-step__bar span {
  width: 62%;
  background: var(--lava);
}

.page-about .review-step__rule {
  margin: 0;
  font-family: var(--font-body);
  font-size: 15.5px;
  line-height: 1.78;
  color: var(--muted);
  max-width: 62ch;
}

.page-about .about-figure--review {
  margin: 0;
}

/* ============ 04 团队分工 ============ */
.page-about .team-list {
  list-style: none;
  margin: clamp(26px, 3.5vw, 42px) 0 0;
  padding: 0;
  display: grid;
  gap: clamp(20px, 2.6vw, 30px);
}

.page-about .team-item {
  border-top: 1px solid var(--line-dark);
  padding-top: 16px;
}

.page-about .team-item__head {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 14px;
}

.page-about .team-item__name {
  font-family: var(--font-head);
  font-size: 18px;
  letter-spacing: 0.08em;
  color: var(--paper);
}

.page-about .team-item__count {
  font-size: 22px;
  letter-spacing: 0.02em;
  font-variant-numeric: tabular-nums;
  color: var(--paper);
}

.page-about .team-item__unit {
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--muted);
  margin-left: 4px;
}

.page-about .team-item__track {
  margin: 12px 0 12px;
  height: 10px;
  background: var(--line-soft);
}

.page-about .team-item__fill {
  display: block;
  height: 100%;
}

.page-about .team-item--a .team-item__fill {
  width: 52.9%;
  background: var(--lime);
}

.page-about .team-item--a .team-item__count {
  color: var(--lime);
}

.page-about .team-item--b .team-item__fill {
  width: 20.6%;
  background: var(--amber);
}

.page-about .team-item--b .team-item__count {
  color: var(--amber);
}

.page-about .team-item--c .team-item__fill {
  width: 14.7%;
  background: var(--lava);
}

.page-about .team-item--c .team-item__count {
  color: var(--lava);
}

.page-about .team-item--d .team-item__fill {
  width: 11.8%;
  background: var(--lake-300);
}

.page-about .team-item--d .team-item__count {
  color: var(--lake-300);
}

.page-about .team-item__duty {
  margin: 0;
  font-family: var(--font-body);
  font-size: 15.5px;
  line-height: 1.78;
  color: var(--muted);
  max-width: 66ch;
}

/* ============ 05 运转节奏（浅底阅读区） ============ */
.page-about .about-cadence {
  background: var(--lake-100);
  color: var(--indigo-900);
  border-top-color: rgba(5, 7, 15, 0.14);
}

.page-about .about-cadence .about-head__no {
  color: #4B6B12;
}

.page-about .about-cadence .about-head__lead,
.page-about .about-cadence .prose {
  color: #2B3345;
}

.page-about .about-cadence .h-section,
.page-about .about-cadence .cadence-item__title {
  color: var(--indigo-900);
}

.page-about .about-cadence .about-figure {
  border-color: rgba(5, 7, 15, 0.14);
  background: var(--lake-300);
}

.page-about .about-cadence .media-frame__caption {
  color: #3A4356;
  border-top-color: rgba(5, 7, 15, 0.12);
}

.page-about .cadence-list {
  list-style: none;
  margin: clamp(28px, 3.5vw, 42px) 0 0;
  padding: 0;
}

.page-about .cadence-item {
  display: grid;
  gap: 8px;
  padding: 20px 0;
  border-top: 1px solid rgba(5, 7, 15, 0.14);
}

.page-about .cadence-item:last-child {
  border-bottom: 1px solid rgba(5, 7, 15, 0.14);
}

.page-about .cadence-item__when {
  font-size: 13px;
  letter-spacing: 0.1em;
  color: #FFFFFF;
  background: var(--indigo-900);
  padding: 3px 9px;
  justify-self: start;
  font-variant-numeric: tabular-nums;
}

.page-about .cadence-item__title {
  margin: 0 0 6px;
  font-family: var(--font-head);
  font-size: 19px;
  font-weight: 600;
  letter-spacing: 0.06em;
}

.page-about .cadence-item__body p {
  margin: 0;
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.78;
  color: #2B3345;
  max-width: 66ch;
}

.page-about .cadence-item__body a {
  color: #2F5A00;
  text-decoration: underline;
  text-underline-offset: 3px;
}

.page-about .cadence-item__body a:hover,
.page-about .cadence-item__body a:focus-visible {
  color: var(--indigo-900);
  background: var(--lime);
}

/* ============ 06 范围回扣 ============ */
.page-about .about-close {
  border-top: 2px solid var(--lava);
  background: var(--ink);
  padding: clamp(40px, 6vw, 78px) 0 clamp(44px, 6vw, 84px);
}

.page-about .about-close__inner {
  display: grid;
  gap: 14px;
}

.page-about .about-close__label {
  color: var(--lava);
  margin: 0;
}

.page-about .about-close__scope {
  margin: 0;
  font-size: clamp(20px, 2.6vw, 30px);
  letter-spacing: 0.06em;
  color: var(--paper);
  font-variant-numeric: tabular-nums;
}

.page-about .about-close__text {
  margin: 0;
  color: var(--muted);
  max-width: 70ch;
}

.page-about .about-close__links {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 10px;
}

/* ============ 响应式 ============ */
@media (min-width: 640px) {
  .page-about .scope-row {
    grid-template-columns: 132px minmax(0, 1fr);
    gap: 0 24px;
    align-items: baseline;
  }

  .page-about .cadence-item {
    grid-template-columns: 150px minmax(0, 1fr);
    gap: 0 24px;
    align-items: start;
  }
}

@media (min-width: 920px) {
  .page-about .about-lede__inner {
    grid-template-columns: minmax(0, 1.45fr) minmax(270px, 0.55fr);
    align-items: end;
  }

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

  .page-about .about-lede__meta {
    grid-column: 2;
    grid-row: 1;
    align-self: end;
  }

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

  .page-about .about-scope__grid {
    grid-template-columns: minmax(0, 0.85fr) minmax(0, 1.15fr);
    align-items: start;
  }

  .page-about .version-node {
    padding-left: 42px;
  }

  .page-about .version-node__marker::before {
    left: -48px;
  }

  .page-about .version-node__marker {
    display: flex;
    align-items: baseline;
  }

  .page-about .team-list {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: clamp(24px, 3vw, 40px);
  }
}

@media (min-width: 1020px) {
  .page-about .about-review__grid {
    grid-template-columns: minmax(0, 1.28fr) minmax(0, 0.72fr);
    align-items: start;
    gap: clamp(32px, 5vw, 64px);
  }

  .page-about .about-figure--review {
    position: sticky;
    top: 96px;
  }
}
<<<END>>>

.page-about {
  --ambers: currentColor;
}