.page-about {
  --about-rail: 184px;
  --about-ink-text: #DEDAD0;
  --about-soft: rgba(243, 237, 226, 0.86);
  background: var(--ink);
  color: var(--about-ink-text);
  padding-bottom: clamp(48px, 7vw, 88px);
}

.page-about .about-hero {
  position: relative;
  overflow: hidden;
  padding: clamp(28px, 5vw, 56px) 0 clamp(36px, 6vw, 68px);
  background:
    radial-gradient(120% 88% at 82% 6%, rgba(53, 230, 196, 0.12), transparent 62%),
    linear-gradient(180deg, var(--ink) 0%, #0A1A16 100%);
  border-bottom: 1px solid var(--line);
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background-image: repeating-linear-gradient(0deg, rgba(143, 163, 157, 0.055) 0 1px, transparent 1px 5px);
  opacity: 0.7;
}

.page-about .about-hero > .wrap {
  position: relative;
  z-index: 1;
}

/* 面包屑 */
.page-about .crumbs__list {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  margin: 0 0 clamp(20px, 3vw, 30px);
  padding: 0;
  list-style: none;
  font-size: 13px;
  color: var(--cold);
}

.page-about .crumbs__list li + li::before {
  content: "/";
  margin-right: 8px;
  color: var(--rock);
}

.page-about .crumbs__list a {
  color: var(--cold);
  text-decoration: none;
  border-bottom: 1px solid transparent;
}

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

.page-about .eyebrow {
  margin: 0 0 14px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--cyan);
}

.page-about .about-hero__title {
  margin: 0 0 clamp(18px, 2.6vw, 26px);
  max-width: 17em;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(34px, 7vw, 68px);
  line-height: 1.04;
  letter-spacing: -0.02em;
  color: var(--paper);
}

.page-about .about-hero__lead {
  max-width: 60ch;
  margin: 0 0 clamp(30px, 5vw, 48px);
  font-size: clamp(15px, 1.7vw, 17px);
  line-height: 1.85;
  color: var(--about-soft);
}

.page-about .about-hero__lead .mono {
  color: var(--cyan);
}

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

.page-about .about-hero__stats li {
  padding: 16px 14px 18px;
  background: rgba(12, 31, 26, 0.72);
}

.page-about .about-hero__num {
  display: block;
  font-size: clamp(26px, 4.2vw, 36px);
  font-weight: 700;
  line-height: 1.1;
  color: var(--cyan);
  font-variant-numeric: tabular-nums;
}

.page-about .about-hero__unit {
  margin-left: 2px;
  font-size: 0.55em;
  color: var(--cold);
}

.page-about .about-hero__label {
  display: block;
  margin-top: 8px;
  font-size: 13px;
  line-height: 1.5;
  color: var(--cold);
}

/* 布局：目录 + 长卷 */
.page-about .about-layout {
  display: grid;
  gap: clamp(26px, 4vw, 40px);
  padding-top: clamp(38px, 6vw, 62px);
}

.page-about .about-rail {
  border-top: 1px solid var(--line-strong);
  padding-top: 14px;
}

.page-about .about-rail__label {
  margin: 0 0 12px;
  font-family: var(--font-serif);
  font-size: 13px;
  letter-spacing: 0.3em;
  color: var(--clay);
}

.page-about .about-rail__list {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 2px 10px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .about-rail__list a {
  display: flex;
  align-items: baseline;
  gap: 8px;
  padding: 7px 0 7px 10px;
  border-left: 2px solid var(--line);
  font-size: 13px;
  line-height: 1.4;
  color: var(--cold);
  text-decoration: none;
  transition: color 160ms ease, border-color 160ms ease;
}

.page-about .about-rail__list a:hover,
.page-about .about-rail__list a:focus-visible {
  color: var(--paper);
  border-left-color: var(--cyan);
}

.page-about .about-rail__num {
  font-size: 11px;
  color: var(--clay);
  letter-spacing: 0.06em;
}

/* 章节 */
.page-about .about-chapter {
  position: relative;
  padding: clamp(34px, 5vw, 56px) 0;
  border-top: 1px solid var(--line);
}

.page-about .about-flow > .about-chapter:first-child {
  border-top: 0;
  padding-top: 0;
}

.page-about .about-chapter--band {
  margin-bottom: clamp(10px, 2vw, 18px);
  padding: clamp(26px, 4vw, 44px) clamp(20px, 3.4vw, 36px) clamp(30px, 4.4vw, 46px);
  background: var(--moss);
  border: 1px solid var(--line);
  border-top: 2px solid rgba(53, 230, 196, 0.55);
}

.page-about .about-num {
  display: block;
  margin-bottom: 6px;
  font-family: var(--font-serif);
  font-size: clamp(46px, 9vw, 84px);
  font-weight: 400;
  line-height: 0.9;
  letter-spacing: 0.02em;
  color: var(--clay);
  opacity: 0.9;
}

.page-about .about-h2 {
  margin: 0 0 clamp(14px, 2vw, 20px);
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(24px, 3.6vw, 36px);
  line-height: 1.14;
  letter-spacing: -0.01em;
  color: var(--paper);
}

.page-about .about-h2--ink {
  color: var(--char);
}

.page-about .about-lead {
  max-width: 56ch;
  margin: 0 0 clamp(20px, 3vw, 28px);
  font-size: 16px;
  line-height: 1.8;
  color: var(--about-soft);
}

.page-about .about-lead--ink {
  color: #3B4340;
}

.page-about .about-prose p {
  max-width: 62ch;
  margin: 0 0 1.15em;
  font-size: 16px;
  line-height: 1.85;
  color: var(--about-ink-text);
}

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

.page-about .about-prose a {
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(53, 230, 196, 0.5);
}

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

/* 档案剖面 */
.page-about .about-anatomy {
  display: grid;
  gap: clamp(22px, 3.4vw, 34px);
  margin-bottom: clamp(26px, 4vw, 38px);
}

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

.page-about .about-parts {
  display: grid;
  gap: 0;
  margin: 0;
  padding: 0;
  list-style: none;
  counter-reset: none;
}

.page-about .about-part {
  padding: 14px 0;
  border-top: 1px solid var(--line);
}

.page-about .about-part:first-child {
  border-top: 0;
  padding-top: 0;
}

.page-about .about-part__idx {
  display: inline-block;
  margin-bottom: 6px;
  font-size: 11px;
  letter-spacing: 0.18em;
  color: var(--orange);
}

.page-about .about-part__name {
  margin: 0 0 6px;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 18px;
  letter-spacing: 0.01em;
  color: var(--paper);
}

.page-about .about-part p {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.72;
  color: var(--cold);
}

/* 图片 */
.page-about .about-figure {
  margin: 0;
  border: 1px solid var(--rock);
  background: rgba(16, 19, 20, 0.5);
}

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

.page-about .about-figure__cap {
  padding: 10px 14px 12px;
  font-size: 12.5px;
  line-height: 1.65;
  color: var(--cold);
  border-top: 1px solid var(--line);
}

/* 更新节奏 */
.page-about .about-cadence {
  margin: 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 0;
}

.page-about .about-cadence__item {
  padding: 16px 0 18px;
  border-top: 1px solid var(--line);
}

.page-about .about-cadence__when {
  display: inline-block;
  margin-bottom: 8px;
  padding: 3px 9px;
  font-size: 11.5px;
  letter-spacing: 0.06em;
  color: var(--ink);
  background: var(--cyan);
  border-radius: var(--radius);
}

.page-about .about-cadence__what {
  margin: 0 0 6px;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 18px;
  color: var(--paper);
}

.page-about .about-cadence__item p {
  max-width: 58ch;
  margin: 0;
  font-size: 14.5px;
  line-height: 1.75;
  color: var(--cold);
}

/* 团队 */
.page-about .about-team {
  display: grid;
  gap: clamp(22px, 3.4vw, 32px);
}

.page-about .about-ratio {
  display: flex;
  gap: 3px;
  margin-bottom: clamp(20px, 3vw, 26px);
  min-height: 60px;
}

.page-about .about-ratio__seg {
  display: flex;
  flex-direction: column;
  justify-content: center;
  gap: 2px;
  min-width: 0;
  padding: 8px 10px;
  border-radius: var(--radius);
  transition: transform 180ms ease, filter 180ms ease;
}

.page-about .about-ratio__seg--a {
  flex: 18 1 0;
  background: rgba(53, 230, 196, 0.9);
  color: var(--ink);
}

.page-about .about-ratio__seg--b {
  flex: 9 1 0;
  background: var(--orange);
  color: #1B0E07;
}

.page-about .about-ratio__seg--c {
  flex: 15 1 0;
  background: rgba(243, 237, 226, 0.16);
  color: var(--paper);
  border: 1px solid rgba(53, 230, 196, 0.4);
}

.page-about .about-ratio__seg:hover {
  transform: translateY(-2px);
  filter: brightness(1.08);
}

.page-about .about-ratio__n {
  font-size: clamp(15px, 2.2vw, 20px);
  font-weight: 700;
  line-height: 1.1;
  font-variant-numeric: tabular-nums;
}

.page-about .about-ratio__t {
  font-size: 11px;
  line-height: 1.3;
  letter-spacing: 0.02em;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.page-about .about-roles {
  margin: 0;
  display: grid;
  gap: 0;
}

.page-about .about-role {
  padding: 14px 0;
  border-top: 1px solid var(--line);
}

.page-about .about-role dt {
  margin-bottom: 5px;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 16.5px;
  color: var(--paper);
}

.page-about .about-role dt .mono {
  color: var(--cyan);
}

.page-about .about-role dd {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.72;
  color: var(--cold);
}

/* 时间轴 */
.page-about .about-timeline {
  position: relative;
  padding-left: 26px;
}

.page-about .about-timeline::before {
  content: "";
  position: absolute;
  left: 5px;
  top: 14px;
  bottom: 14px;
  width: 1px;
  background: linear-gradient(180deg, var(--cyan) 0%, rgba(53, 230, 196, 0.14) 100%);
}

.page-about .about-node {
  position: relative;
  border-bottom: 1px solid var(--line);
}

.page-about .about-node::before {
  content: "";
  position: absolute;
  left: -25px;
  top: 21px;
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--clay);
  box-shadow: 0 0 0 4px rgba(178, 106, 69, 0.18);
}

.page-about .about-node__sum {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 8px 12px;
  padding: 15px 0;
  cursor: pointer;
  list-style: none;
}

.page-about .about-node__sum::-webkit-details-marker {
  display: none;
}

.page-about .about-node__sum::after {
  content: "+";
  margin-left: auto;
  font-family: var(--font-mono);
  font-size: 16px;
  color: var(--cyan);
}

.page-about .about-node[open] .about-node__sum::after {
  content: "–";
}

.page-about .about-node__ver {
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.04em;
  color: var(--cyan);
}

.page-about .about-node__name {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 19px;
  color: var(--paper);
}

.page-about .about-node__stage {
  padding: 2px 8px;
  font-size: 11.5px;
  color: var(--cold);
  border: 1px solid var(--line-strong);
  border-radius: var(--radius);
}

.page-about .about-node__body {
  margin: 0 0 16px;
  max-width: 58ch;
  font-size: 14.5px;
  line-height: 1.78;
  color: var(--cold);
}

/* 协作网络 */
.page-about .about-figure--wide {
  margin-bottom: clamp(22px, 3.4vw, 32px);
}

/* 米白收束区 */
.page-about .about-chapter--paper {
  margin-top: clamp(20px, 3vw, 30px);
  padding: clamp(26px, 4.4vw, 46px) clamp(20px, 3.4vw, 36px) clamp(30px, 4.6vw, 48px);
  background: var(--paper);
  color: var(--char);
  border: 1px solid var(--rock);
  box-shadow: 7px 7px 0 rgba(69, 76, 73, 0.34);
}

.page-about .about-chapter--paper .about-num {
  color: var(--deep);
  opacity: 1;
}

.page-about .about-facts {
  display: grid;
  gap: 0;
  margin: 0 0 clamp(16px, 2.4vw, 22px);
}

.page-about .about-fact {
  display: grid;
  grid-template-columns: 5.5em minmax(0, 1fr);
  gap: 12px;
  padding: 11px 0;
  border-top: 1px solid rgba(69, 76, 73, 0.25);
}

.page-about .about-fact dt {
  font-size: 13px;
  line-height: 1.6;
  color: #5A625E;
}

.page-about .about-fact dd {
  margin: 0;
  font-size: 15px;
  line-height: 1.6;
  color: var(--char);
  overflow-wrap: anywhere;
}

.page-about .about-fact dd a {
  color: var(--deep);
  text-decoration: none;
  border-bottom: 1px solid rgba(20, 119, 107, 0.45);
}

.page-about .about-fact dd a:hover,
.page-about .about-fact dd a:focus-visible {
  border-bottom-color: var(--deep);
}

.page-about .about-note {
  max-width: 58ch;
  margin: 0 0 clamp(20px, 3vw, 28px);
  font-size: 13.5px;
  line-height: 1.75;
  color: #4A524E;
}

.page-about .about-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

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

@media (min-width: 640px) {
  .page-about .about-hero__stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

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

  .page-about .about-parts {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 0 22px;
  }

  .page-about .about-cadence__item {
    display: grid;
    grid-template-columns: 8.5em minmax(0, 1fr);
    gap: 4px 18px;
    align-items: start;
  }

  .page-about .about-cadence__when {
    grid-row: span 2;
    margin-bottom: 0;
    justify-self: start;
    text-align: center;
  }

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

  .page-about .about-roles {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 0 18px;
  }

  .page-about .about-role {
    border-top: 2px solid rgba(53, 230, 196, 0.32);
  }

  .page-about .about-facts {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 0 26px;
  }
}

@media (min-width: 960px) {
  .page-about .about-layout {
    grid-template-columns: var(--about-rail) minmax(0, 1fr);
    gap: clamp(34px, 4.5vw, 60px);
    align-items: start;
  }

  .page-about .about-rail {
    position: sticky;
    top: calc(var(--header-h) + 26px);
    padding-top: 16px;
  }

  .page-about .about-rail__list {
    grid-template-columns: minmax(0, 1fr);
    gap: 0;
  }

  .page-about .about-rail__list a {
    padding: 9px 0 9px 12px;
  }

  .page-about .about-anatomy {
    grid-template-columns: minmax(0, 0.9fr) minmax(0, 1.1fr);
    align-items: start;
  }

  .page-about .about-parts {
    grid-template-columns: minmax(0, 1fr);
    gap: 0;
  }

  .page-about .about-part {
    padding: 12px 0;
  }

  .page-about .about-part:first-child {
    padding-top: 0;
  }

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

  .page-about .about-figure--wave {
    margin-bottom: 0;
  }

  .page-about .about-num {
    position: absolute;
    left: 0;
    top: clamp(30px, 4.6vw, 52px);
    margin: 0;
    pointer-events: none;
  }

  .page-about .about-chapter {
    padding-left: 96px;
  }

  .page-about .about-chapter--band,
  .page-about .about-chapter--paper {
    padding-left: clamp(20px, 3.4vw, 36px);
  }

  .page-about .about-chapter--band .about-num,
  .page-about .about-chapter--paper .about-num {
    position: static;
    margin-bottom: 6px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-ratio__seg,
  .page-about .about-rail__list a {
    transition: none;
  }

  .page-about .about-ratio__seg:hover {
    transform: none;
  }
}
<<<END>>>