.page-about {
  --about-indent: 32px;
  --about-rail-x: 5px;
  --about-paper-ink: #0C2C22;
  --about-paper-soft: rgba(20, 102, 79, 0.18);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  padding: clamp(20px, 4vw, 36px) 0 clamp(32px, 5vw, 60px);
  overflow: hidden;
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  top: -30%;
  right: -22%;
  width: min(680px, 78%);
  height: 150%;
  background: linear-gradient(152deg, rgba(20, 102, 79, 0.62) 0%, rgba(47, 240, 200, 0.10) 52%, rgba(5, 18, 14, 0) 76%);
  clip-path: polygon(0 0, 100% 0, 100% 58%, 0 100%);
  pointer-events: none;
}

.page-about .about-hero .crumbs {
  position: relative;
  margin-bottom: clamp(20px, 3vw, 34px);
}

.page-about .about-hero__grid {
  position: relative;
  display: grid;
  gap: clamp(26px, 4vw, 44px);
}

.page-about .about-hero__title {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: var(--fs-88);
  line-height: 1.04;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--paper-100);
  margin: 0.3em 0 0.35em;
}

.page-about .about-hero__title::after {
  content: "";
  display: block;
  width: 88px;
  height: 4px;
  margin-top: 0.42em;
  border-radius: var(--r-pill);
  background: linear-gradient(90deg, var(--cyan-400), var(--gold-400) 62%, var(--orange-500));
}

.page-about .about-hero__lede {
  color: var(--muted-400);
  max-width: 38em;
}

.page-about .about-hero__stats {
  list-style: none;
  margin: clamp(24px, 3.5vw, 36px) 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: clamp(12px, 2vw, 24px);
  border-top: 1px solid var(--line-500);
  padding-top: clamp(16px, 2.4vw, 24px);
}

.page-about .about-hero__stat {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.page-about .about-hero__stat-v {
  font-family: var(--font-num);
  font-weight: 600;
  font-size: var(--fs-28);
  color: var(--gold-400);
  letter-spacing: 0.01em;
}

.page-about .about-hero__stat-k {
  font-size: var(--fs-12);
  color: var(--muted-400);
  letter-spacing: 0.06em;
}

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

/* ---------- 章节索引带 ---------- */
.page-about .about-nav {
  margin-bottom: clamp(40px, 7vw, 84px);
}

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

.page-about .about-nav .index-band__link {
  display: inline-flex;
  align-items: center;
  min-height: 34px;
  padding: 6px 16px;
  border-radius: var(--r-pill);
  border: 1px solid var(--line-500);
  background: var(--ink-800);
  color: var(--muted-400);
  font-family: var(--font-display);
  font-size: var(--fs-14);
  font-weight: 700;
  letter-spacing: 0.08em;
  text-decoration: none;
  transition: color var(--dur-1) var(--ease), border-color var(--dur-1) var(--ease), background var(--dur-1) var(--ease);
}

.page-about .about-nav .index-band__link:hover,
.page-about .about-nav .index-band__link:focus-visible {
  color: var(--cyan-200);
  border-color: var(--cyan-200);
  background: rgba(156, 251, 228, 0.08);
}

.page-about .about-nav .index-band__link[data-active] {
  color: var(--ink-900);
  background: var(--cyan-400);
  border-color: var(--cyan-400);
}

/* ---------- 纵向骨架 ---------- */
.page-about .about-spine {
  position: relative;
  display: grid;
  row-gap: clamp(52px, 9vw, 110px);
  padding-bottom: clamp(48px, 8vw, 96px);
}

.page-about .about-spine::before {
  content: "";
  position: absolute;
  top: 10px;
  bottom: 10px;
  left: var(--about-rail-x);
  width: 2px;
  background: linear-gradient(180deg, var(--gold-400) 0%, var(--jade-600) 14%, var(--line-500) 64%, rgba(30, 70, 58, 0) 100%);
}

.page-about .about-chapter {
  position: relative;
  display: grid;
  row-gap: clamp(16px, 2.4vw, 26px);
  padding-left: var(--about-indent);
}

.page-about .about-chapter__node {
  position: absolute;
  left: calc(var(--about-rail-x) - 5px);
  top: 8px;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--gold-400);
  box-shadow: 0 0 0 3px var(--ink-900), 0 0 0 5px rgba(242, 179, 61, 0.26);
}

.page-about .about-chapter__kicker {
  margin: 0 0 10px;
  display: flex;
  align-items: center;
  gap: 10px;
  font-family: var(--font-display);
  font-size: var(--fs-12);
  font-weight: 700;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--cyan-400);
}

.page-about .about-chapter__kicker .num {
  color: var(--muted-400);
}

.page-about .about-chapter__title {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: var(--fs-28);
  line-height: 1.18;
  letter-spacing: 0.02em;
  color: var(--paper-100);
}

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

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

.page-about .prose p {
  margin: 0 0 1em;
  color: var(--muted-400);
}

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

.page-about .prose a {
  color: var(--cyan-400);
  text-underline-offset: 3px;
}

/* ---------- 悬挂旁注 ---------- */
.page-about .side-note {
  margin-top: clamp(18px, 2.6vw, 28px);
  padding-left: 16px;
  border-left: 2px solid var(--line-500);
}

.page-about .side-note__tag {
  display: block;
  margin-bottom: 8px;
  font-family: var(--font-display);
  font-size: var(--fs-12);
  font-weight: 700;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--jade-600);
  filter: brightness(1.7);
}

.page-about .side-note p {
  margin: 0;
  max-width: 34em;
  font-size: var(--fs-14);
  line-height: 1.7;
  color: var(--muted-400);
}

/* ---------- 纸白区块 ---------- */
.page-about .about-paper {
  background: var(--paper-100);
  border-radius: var(--r-lg);
  padding: clamp(22px, 4vw, 52px);
  color: var(--about-paper-ink);
  box-shadow: 0 32px 70px -40px rgba(0, 0, 0, 0.95);
}

.page-about .about-paper .about-chapter__kicker {
  color: var(--jade-600);
}

.page-about .about-paper .about-chapter__kicker .num {
  color: rgba(12, 44, 34, 0.45);
}

.page-about .about-paper .about-chapter__title {
  color: var(--ink-900);
}

.page-about .about-paper .prose {
  margin-bottom: clamp(20px, 3vw, 30px);
}

.page-about .about-paper .prose p {
  color: var(--about-paper-ink);
}

.page-about .about-paper .prose a {
  color: var(--jade-600);
}

/* ---------- 字段口径表 ---------- */
.page-about .about-ledger {
  width: 100%;
  min-width: 620px;
  border-collapse: collapse;
  font-size: var(--fs-14);
  color: var(--about-paper-ink);
}

.page-about .about-ledger caption {
  caption-side: top;
  text-align: left;
  padding-bottom: 14px;
  font-family: var(--font-display);
  font-size: var(--fs-12);
  font-weight: 700;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--jade-600);
}

.page-about .about-ledger thead th {
  text-align: left;
  padding: 10px 14px;
  white-space: nowrap;
  font-family: var(--font-display);
  font-size: var(--fs-12);
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--jade-600);
  border-bottom: 2px solid var(--jade-600);
}

.page-about .about-ledger tbody tr {
  border-bottom: 1px solid var(--about-paper-soft);
  transition: background var(--dur-1) var(--ease);
}

.page-about .about-ledger tbody tr:nth-child(even) {
  background: rgba(20, 102, 79, 0.05);
}

.page-about .about-ledger tbody tr:hover {
  background: rgba(47, 240, 200, 0.22);
}

.page-about .about-ledger tbody th {
  text-align: left;
  padding: 11px 14px;
  white-space: nowrap;
  font-family: var(--font-num);
  font-weight: 600;
  font-size: var(--fs-14);
  color: var(--ink-900);
  border-bottom: inherit;
}

.page-about .about-ledger td {
  padding: 11px 14px;
  line-height: 1.65;
  vertical-align: top;
  border-bottom: 1px solid var(--about-paper-soft);
}

.page-about .about-ledger td:last-child {
  color: rgba(12, 44, 34, 0.72);
}

/* ---------- 纸白区内的规则说明 ---------- */
.page-about .rule-note {
  margin-top: clamp(20px, 3vw, 30px);
}

/* ---------- 纸白区内的插图 ---------- */
.page-about .about-inline-media {
  margin: clamp(24px, 3.6vw, 40px) 0 0;
}

/* ---------- 比对流程 ---------- */
.page-about .about-diff {
  list-style: none;
  margin: clamp(20px, 3vw, 32px) 0;
  padding: 0;
  display: grid;
  gap: clamp(14px, 2vw, 22px);
  counter-reset: none;
}

.page-about .about-diff__step {
  display: grid;
  grid-template-columns: 46px minmax(0, 1fr);
  gap: clamp(12px, 2vw, 22px);
  align-items: start;
  padding: clamp(14px, 2vw, 20px) clamp(14px, 2vw, 22px);
  border-radius: var(--r-md);
  background: var(--ink-800);
  border: 1px solid var(--ink-700);
}

.page-about .about-diff__idx {
  font-family: var(--font-num);
  font-weight: 600;
  font-size: var(--fs-20);
  color: var(--gold-400);
  line-height: 1.3;
}

.page-about .about-diff__text h3 {
  margin: 0 0 6px;
  font-family: var(--font-display);
  font-size: var(--fs-16);
  font-weight: 800;
  letter-spacing: 0.06em;
  color: var(--paper-100);
}

.page-about .about-diff__text p {
  margin: 0;
  font-size: var(--fs-14);
  line-height: 1.75;
  color: var(--muted-400);
}

/* ---------- 四类角色 ---------- */
.page-about .about-roles {
  display: grid;
  gap: clamp(14px, 2vw, 22px);
  margin: clamp(20px, 3vw, 32px) 0;
}

.page-about .about-role {
  position: relative;
  padding: clamp(18px, 2.6vw, 28px);
  border-radius: var(--r-md);
  background: linear-gradient(160deg, rgba(20, 102, 79, 0.30), rgba(10, 31, 24, 0.9));
  border: 1px solid var(--ink-700);
}

.page-about .about-role__count {
  display: block;
  font-family: var(--font-num);
  font-weight: 600;
  font-size: var(--fs-44);
  line-height: 1;
  color: var(--cyan-400);
}

.page-about .about-role__name {
  margin: 10px 0 8px;
  font-family: var(--font-display);
  font-size: var(--fs-20);
  font-weight: 800;
  letter-spacing: 0.08em;
  color: var(--paper-100);
}

.page-about .about-role__desc {
  margin: 0;
  font-size: var(--fs-14);
  line-height: 1.75;
  color: var(--muted-400);
}

/* ---------- 更新节奏 ---------- */
.page-about .about-cadence {
  list-style: none;
  margin: clamp(20px, 3vw, 32px) 0;
  padding: 0;
  border-top: 1px solid var(--line-500);
}

.page-about .about-cadence__item {
  display: grid;
  gap: 6px;
  padding: clamp(16px, 2.4vw, 24px) 0;
  border-bottom: 1px solid var(--line-500);
}

.page-about .about-cadence__mark {
  display: inline-flex;
  align-items: center;
  align-self: start;
  padding: 4px 12px;
  border-radius: var(--r-pill);
  background: rgba(47, 240, 200, 0.12);
  border: 1px solid rgba(47, 240, 200, 0.34);
  font-family: var(--font-num);
  font-weight: 600;
  font-size: var(--fs-12);
  letter-spacing: 0.04em;
  color: var(--cyan-200);
  white-space: nowrap;
}

.page-about .about-cadence__text h3 {
  margin: 4px 0 6px;
  font-family: var(--font-display);
  font-size: var(--fs-16);
  font-weight: 800;
  letter-spacing: 0.06em;
  color: var(--paper-100);
}

.page-about .about-cadence__text p {
  margin: 0;
  max-width: 36em;
  font-size: var(--fs-14);
  line-height: 1.75;
  color: var(--muted-400);
}

/* ---------- 档案插图 ---------- */
.page-about .about-archive-figure {
  margin: clamp(22px, 3.4vw, 36px) 0 0;
  aspect-ratio: 9 / 14;
}

.page-about .about-archive-figure .media-frame__img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

/* ---------- 边界清单 ---------- */
.page-about .about-limits {
  list-style: none;
  margin: clamp(20px, 3vw, 32px) 0;
  padding: 0;
  display: grid;
  gap: clamp(14px, 2vw, 22px);
}

.page-about .about-limits__item {
  padding-left: 18px;
  border-left: 3px solid var(--orange-500);
}

.page-about .about-limits__item h3 {
  margin: 0 0 6px;
  font-family: var(--font-display);
  font-size: var(--fs-16);
  font-weight: 800;
  letter-spacing: 0.06em;
  color: var(--paper-100);
}

.page-about .about-limits__item p {
  margin: 0;
  max-width: 36em;
  font-size: var(--fs-14);
  line-height: 1.75;
  color: var(--muted-400);
}

/* ---------- 图片通用 ---------- */
.page-about .media-frame__img {
  display: block;
  max-width: 100%;
  height: auto;
}

/* ---------- 平板及以上 ---------- */
@media (min-width: 700px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 1.08fr) minmax(0, 0.92fr);
    align-items: end;
  }

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

  .page-about .about-roles .about-role:nth-child(2) {
    transform: translateY(22px);
  }

  .page-about .about-roles .about-role:nth-child(4) {
    transform: translateY(22px);
  }
}

/* ---------- 桌面：轴线 + 双栏 ---------- */
@media (min-width: 880px) {
  .page-about .about-spine::before {
    left: 28px;
  }

  .page-about .about-chapter {
    display: grid;
    grid-template-columns: minmax(0, 0.82fr) minmax(0, 1.5fr);
    column-gap: clamp(24px, 3.6vw, 60px);
    row-gap: 0;
    align-items: start;
    padding-left: 68px;
  }

  .page-about .about-chapter__node {
    left: 23px;
    top: 10px;
  }

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

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

  .page-about .about-chapter--paper {
    display: block;
    padding-left: 68px;
  }

  .page-about .about-chapter--paper .about-chapter__head {
    margin-bottom: clamp(16px, 2.4vw, 24px);
  }

  .page-about .side-note {
    position: relative;
  }

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

  .page-about .about-roles .about-role:nth-child(2) {
    transform: translateY(28px);
  }

  .page-about .about-roles .about-role:nth-child(3) {
    transform: translateY(56px);
  }

  .page-about .about-roles .about-role:nth-child(4) {
    transform: translateY(84px);
  }

  .page-about .about-cadence__item {
    grid-template-columns: minmax(140px, 0.42fr) minmax(0, 1fr);
    align-items: start;
    gap: clamp(18px, 2.6vw, 34px);
  }

  .page-about .about-cadence__mark {
    justify-self: start;
  }
}

/* ---------- 大屏微调 ---------- */
@media (min-width: 1120px) {
  .page-about .about-chapter {
    grid-template-columns: minmax(0, 0.76fr) minmax(0, 1.6fr);
  }

  .page-about .about-hero__stat-v {
    font-size: var(--fs-44);
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-ledger tbody tr,
  .page-about .about-nav .index-band__link {
    transition: none;
  }
}
<<<END>>>