.page-about {
  --about-line: rgba(44, 90, 75, .55);
  --about-faint: rgba(123, 138, 132, .34);
  position: relative;
  background: var(--ink-900);
  color: var(--paper-100);
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.75;
  padding: clamp(24px, 4vw, 48px) var(--shell-pad) clamp(56px, 8vw, 104px);
  overflow-x: clip;
}

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

.page-about p {
  margin: 0;
}

.page-about .breadcrumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px;
  margin-bottom: clamp(22px, 4vw, 40px);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .08em;
  color: var(--gray-450);
}

.page-about .breadcrumb a {
  color: var(--paper-300);
  text-decoration: none;
}

.page-about .breadcrumb a:hover {
  color: var(--cyan-400);
}

.page-about .eyebrow {
  display: block;
  margin: 0;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .2em;
  color: var(--cyan-400);
  text-transform: uppercase;
}

/* 首屏 */
.about-hero {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(22px, 3vw, 34px);
  padding-bottom: clamp(28px, 4vw, 56px);
  border-bottom: 1px solid var(--about-line);
}

.about-hero__note {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .18em;
  color: var(--gray-450);
  line-height: 1.5;
}

.about-hero__title {
  margin: 12px 0 0;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(32px, 6.4vw, 70px);
  line-height: 1.03;
  letter-spacing: -0.02em;
}

.about-hero__lede {
  max-width: 620px;
  margin-top: 20px;
  color: var(--paper-300);
  font-size: 16px;
  line-height: 1.8;
}

.about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 26px;
}

.about-board {
  position: relative;
  border: 1px solid var(--about-line);
  background: linear-gradient(180deg, var(--ink-700), rgba(10, 30, 24, .15));
  padding: 22px 20px 14px;
}

.about-board::before {
  content: "";
  position: absolute;
  left: -1px;
  top: -1px;
  width: 46px;
  height: 4px;
  background: var(--cyan-400);
}

.about-board__tag {
  margin: 0 0 12px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .2em;
  color: var(--cyan-400);
}

.about-board__row {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 14px;
  padding: 10px 0;
  border-bottom: 1px dashed var(--about-faint);
}

.about-board__row:last-child {
  border-bottom: 0;
  padding-bottom: 4px;
}

.about-board__row dt {
  color: var(--paper-300);
  font-size: 13px;
}

.about-board__row dd {
  margin: 0;
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: 15px;
  letter-spacing: .04em;
  color: var(--paper-100);
  white-space: nowrap;
}

/* 布局与目录 */
.about-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(18px, 3vw, 32px);
  margin-top: clamp(26px, 4vw, 44px);
}

.about-flow {
  min-width: 0;
}

.about-toc {
  order: -1;
  padding: 12px 0;
  border-top: 1px solid var(--about-line);
  border-bottom: 1px solid var(--about-line);
}

.about-toc__title {
  margin: 0 0 10px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .2em;
  color: var(--gray-450);
}

.about-toc__list {
  display: flex;
  gap: 8px;
  margin: 0;
  padding: 0 0 2px;
  list-style: none;
  overflow-x: auto;
}

.about-toc__list a {
  display: block;
  padding: 6px 10px;
  white-space: nowrap;
  border: 1px solid var(--about-line);
  color: var(--paper-300);
  font-size: 12px;
  text-decoration: none;
  border-radius: 2px;
  transition: color 180ms var(--ease), border-color 180ms var(--ease);
}

.about-toc__list a:hover,
.about-toc__list a:focus-visible {
  color: var(--cyan-400);
  border-color: var(--cyan-400);
}

/* 区块节奏 */
.about-section {
  padding-block: clamp(34px, 5.5vw, 68px);
}

.about-section + .about-section {
  border-top: 1px dashed var(--about-faint);
}

.about-h2 {
  margin: 10px 0 0;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(24px, 3.4vw, 40px);
  line-height: 1.12;
  letter-spacing: -0.02em;
}

.about-sub {
  margin: 0 0 10px;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 17px;
  line-height: 1.3;
}

.about-lead {
  max-width: 640px;
  margin-top: 16px;
  color: var(--paper-300);
  font-size: 15px;
  line-height: 1.8;
}

.about-note {
  margin-top: 24px;
  padding-left: 14px;
  border-left: 2px solid var(--orange-500);
  color: var(--paper-300);
  font-size: 14px;
  line-height: 1.75;
}

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

.page-about .figure__img {
  width: 100%;
  object-fit: cover;
  filter: saturate(.62) brightness(.92);
}

.page-about .figure__caption {
  margin-top: 10px;
  color: var(--gray-450);
  font-size: 12px;
  line-height: 1.65;
  letter-spacing: .03em;
}

/* 起点 */
.about-origin {
  display: grid;
  gap: 28px;
  margin-top: 24px;
}

.about-origin__text {
  color: var(--paper-300);
  font-size: 15px;
  line-height: 1.85;
}

.about-origin__text p + p {
  margin-top: 14px;
}

/* 时间轴 */
.timeline {
  position: relative;
  margin: 30px 0 0;
  padding: 0;
  list-style: none;
}

.tl__item {
  --tl-pad: 40px;
  --tl-axis: 10px;
  position: relative;
  padding-left: var(--tl-pad);
  padding-bottom: 22px;
}

.tl__item::after {
  content: "";
  position: absolute;
  left: var(--tl-axis);
  top: 18px;
  bottom: 0;
  width: 1px;
  background: linear-gradient(180deg, var(--moss-500), rgba(44, 90, 75, .12));
}

.tl__item:last-child::after {
  display: none;
}

.tl__year {
  display: block;
  margin-bottom: 8px;
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 700;
  letter-spacing: .16em;
  color: var(--orange-500);
}

.tl__group {
  border-radius: 2px;
}

.tl__summary {
  position: relative;
  display: flex;
  align-items: baseline;
  flex-wrap: wrap;
  gap: 10px;
  cursor: pointer;
  list-style: none;
  transition: color 180ms var(--ease);
}

.tl__summary::-webkit-details-marker {
  display: none;
}

.tl__summary::before {
  content: "";
  position: absolute;
  left: calc(var(--tl-axis) - var(--tl-pad) - 5px);
  top: 11px;
  width: 11px;
  height: 11px;
  border: 1px solid var(--orange-500);
  border-radius: 50%;
  background: var(--ink-900);
  transition: background 200ms var(--ease), border-color 200ms var(--ease), box-shadow 200ms var(--ease);
}

.tl__group[open] > .tl__summary::before {
  background: var(--cyan-400);
  border-color: var(--cyan-400);
  box-shadow: 0 0 0 4px rgba(52, 240, 206, .16);
}

.tl__ver {
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: 12px;
  letter-spacing: .06em;
  color: var(--cyan-400);
  border: 1px solid rgba(52, 240, 206, .42);
  border-radius: 2px;
  padding: 1px 6px;
}

.tl__head {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(17px, 2.1vw, 21px);
  line-height: 1.35;
  letter-spacing: -0.01em;
}

.tl__hint {
  margin-left: auto;
  font-family: var(--font-mono);
  font-size: 14px;
  color: var(--gray-450);
  line-height: 1;
}

.tl__hint::before {
  content: "＋";
}

.tl__group[open] .tl__hint::before {
  content: "−";
}

.tl__body {
  margin-top: 12px;
  padding: 14px 16px 12px;
  border-left: 2px solid var(--cyan-400);
  background: rgba(18, 53, 41, .62);
  color: var(--paper-300);
  font-size: 14px;
  line-height: 1.8;
}

.tl__body p {
  margin: 0;
}

.tl__list {
  margin: 10px 0 0;
  padding: 0;
  list-style: none;
}

.tl__list li {
  position: relative;
  padding-left: 16px;
  margin-bottom: 7px;
}

.tl__list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: .72em;
  width: 8px;
  height: 1px;
  background: var(--cyan-400);
}

/* 米白纸张区块 */
.about-section--paper {
  background: var(--paper-100);
  color: var(--ink-900);
  padding-inline: clamp(16px, 3.2vw, 36px);
  margin-inline: calc(clamp(16px, 3.2vw, 36px) * -1);
  padding-block: clamp(34px, 5.5vw, 64px);
}

.about-section--paper .eyebrow {
  color: var(--ink-700);
}

.about-section--paper .figure__caption,
.about-section--paper .about-note {
  color: var(--ink-700);
}

.about-section--paper .about-note {
  border-left-color: var(--orange-500);
}

.about-team__figure {
  margin-top: 24px;
}

.roster {
  width: 100%;
  margin-top: 28px;
  border-collapse: collapse;
  font-size: 15px;
}

.roster thead th {
  padding: 0 12px 9px 0;
  text-align: left;
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 700;
  letter-spacing: .18em;
  color: var(--ink-700);
  border-bottom: 1px solid var(--paper-300);
}

.roster tbody th,
.roster tbody td {
  padding: 14px 12px 14px 0;
  text-align: left;
  vertical-align: top;
  border-bottom: 1px dashed var(--paper-300);
  line-height: 1.7;
}

.roster tbody th {
  font-weight: 700;
  white-space: nowrap;
  font-size: 15px;
}

.roster__num {
  font-family: var(--font-mono);
  font-weight: 700;
  color: var(--ink-700);
  white-space: nowrap;
}

.roster tbody tr {
  transition: background 200ms var(--ease), color 200ms var(--ease);
}

.roster tbody tr:hover {
  background: var(--ink-700);
  color: var(--paper-100);
}

.roster tbody tr:hover .roster__num {
  color: var(--cyan-400);
}

/* 更新流程 */
.flow {
  display: grid;
  gap: 20px;
  margin: 28px 0 0;
  padding: 0;
  list-style: none;
}

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

.flow__step h3 {
  margin: 8px 0 6px;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 17px;
  line-height: 1.3;
}

.flow__no {
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: .12em;
  color: var(--orange-500);
}

.flow__step p {
  color: var(--paper-300);
  font-size: 14px;
  line-height: 1.75;
}

/* 规模数据 */
.metrics {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin-top: 28px;
  background: var(--about-line);
  border: 1px solid var(--about-line);
}

.metric {
  background: var(--ink-900);
  padding: 18px 14px;
}

.metric__num {
  display: block;
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: clamp(22px, 3vw, 30px);
  line-height: 1.15;
  letter-spacing: .02em;
  color: var(--cyan-400);
}

.metric:nth-child(2) .metric__num,
.metric:nth-child(5) .metric__num {
  color: var(--orange-500);
}

.metric__label {
  display: block;
  margin-top: 8px;
  font-size: 12px;
  line-height: 1.6;
  color: var(--gray-450);
}

/* 协作 */
.league {
  display: grid;
  gap: 26px;
  margin-top: 28px;
}

.league__give,
.league__get {
  padding-top: 14px;
  border-top: 2px solid var(--moss-500);
}

.league__get {
  border-top-color: var(--cyan-400);
}

.league ul {
  margin: 0;
  padding: 0;
  list-style: none;
}

.league li {
  position: relative;
  padding-left: 16px;
  margin-bottom: 9px;
  color: var(--paper-300);
  font-size: 14px;
  line-height: 1.75;
}

.league li::before {
  content: "";
  position: absolute;
  left: 0;
  top: .72em;
  width: 8px;
  height: 1px;
  background: var(--cyan-400);
}

/* 年度报告 */
.report {
  display: grid;
  gap: 30px;
  margin-top: 28px;
}

.report__stack {
  position: relative;
  padding: 0 8px 8px 0;
}

.report__stack .figure__frame {
  position: relative;
  z-index: 1;
}

.report__stack::after {
  content: "";
  position: absolute;
  left: var(--stack-2);
  top: var(--stack-2);
  right: calc(var(--stack-2) * -1);
  bottom: calc(var(--stack-2) * -1);
  border: 1px solid var(--about-line);
  background: rgba(242, 237, 227, .04);
}

.report__text {
  color: var(--paper-300);
  font-size: 15px;
  line-height: 1.85;
}

.report__text p + p {
  margin-top: 14px;
}

.report__toggle {
  margin-top: 20px;
  border-top: 1px solid var(--about-line);
}

.report__toggle summary {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 13px 0;
  cursor: pointer;
  list-style: none;
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: .06em;
  color: var(--cyan-400);
}

.report__toggle summary::-webkit-details-marker {
  display: none;
}

.report__toggle summary::after {
  content: "＋";
  margin-left: auto;
  font-size: 14px;
}

.report__toggle[open] summary {
  color: var(--paper-100);
}

.report__toggle[open] summary::after {
  content: "−";
  color: var(--cyan-400);
}

.report__chapters {
  margin: 0 0 6px;
  padding: 0;
  list-style: none;
}

.report__chapters li {
  display: flex;
  gap: 14px;
  padding: 10px 0;
  border-bottom: 1px dashed var(--about-faint);
  font-size: 14px;
  color: var(--paper-300);
  line-height: 1.6;
}

.report__chapters .num {
  flex: none;
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 700;
  color: var(--orange-500);
  letter-spacing: .08em;
  padding-top: 2px;
}

/* 下一步 */
.next-list {
  display: grid;
  gap: 18px;
  margin: 26px 0 0;
  padding: 0;
  list-style: none;
}

.next-list li {
  padding: 4px 0 4px 16px;
  border-left: 2px solid var(--orange-500);
}

.next-list h3 {
  margin: 0 0 7px;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 17px;
  line-height: 1.3;
}

.next-list p {
  color: var(--paper-300);
  font-size: 14px;
  line-height: 1.75;
}

/* 结尾 */
.about-cta {
  display: grid;
  gap: 22px;
  margin-top: clamp(40px, 6vw, 76px);
  padding-top: 30px;
  border-top: 1px solid var(--about-line);
}

.about-cta__title {
  margin: 0 0 10px;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(22px, 3vw, 32px);
  line-height: 1.18;
  letter-spacing: -0.01em;
}

.about-cta p {
  max-width: 560px;
  color: var(--paper-300);
  font-size: 15px;
  line-height: 1.8;
}

.about-cta__links {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

/* 断点 */
@media (min-width: 700px) {
  .flow {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 24px 28px;
  }

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

@media (min-width: 880px) {
  .about-origin {
    grid-template-columns: minmax(0, 1fr) minmax(0, .82fr);
    align-items: start;
    gap: 48px;
  }

  .about-origin__figure {
    margin-top: -18px;
  }

  .league {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 44px;
  }

  .report {
    grid-template-columns: minmax(0, .78fr) minmax(0, 1fr);
    align-items: start;
    gap: 46px;
  }
}

@media (min-width: 900px) {
  .about-hero {
    grid-template-columns: 30px minmax(0, 1fr) minmax(0, 320px);
    align-items: start;
    gap: clamp(24px, 3vw, 46px);
  }

  .about-hero__note {
    writing-mode: vertical-rl;
    padding-top: 6px;
    align-self: stretch;
  }

  .tl__item {
    --tl-pad: 112px;
    --tl-axis: 84px;
  }

  .tl__year {
    position: absolute;
    left: 30px;
    top: 2px;
    margin: 0;
    writing-mode: vertical-rl;
    letter-spacing: .3em;
  }
}

@media (min-width: 1024px) {
  .about-layout {
    grid-template-columns: minmax(0, 1fr) 176px;
    gap: clamp(28px, 3.5vw, 56px);
  }

  .about-toc {
    order: 0;
    position: sticky;
    top: 88px;
    align-self: start;
    padding: 0 0 0 16px;
    border-top: 0;
    border-bottom: 0;
    border-left: 1px solid var(--about-line);
  }

  .about-toc__list {
    display: block;
    overflow: visible;
  }

  .about-toc__list li + li {
    margin-top: 2px;
  }

  .about-toc__list a {
    border: 0;
    padding: 7px 0;
    font-size: 13px;
  }

  .metrics {
    grid-template-columns: repeat(5, minmax(0, 1fr));
  }

  .next-list {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .flow {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

@media (max-width: 701px) {
  .roster thead {
    display: none;
  }

  .roster,
  .roster tbody,
  .roster tr,
  .roster th,
  .roster td {
    display: block;
    width: auto;
  }

  .roster tbody tr {
    padding: 14px 0;
    border-bottom: 1px dashed var(--paper-300);
  }

  .roster tbody th,
  .roster tbody td {
    padding: 0;
    border: 0;
  }

  .roster tbody th {
    font-size: 16px;
    margin-bottom: 4px;
  }

  .roster__num {
    margin-bottom: 6px;
  }

  .roster__num::after {
    content: " 人";
    font-family: var(--font-body);
    font-weight: 400;
    color: var(--ink-700);
  }

  .about-cta .btn {
    flex: 1 1 auto;
    text-align: center;
  }
}

@media (prefers-reduced-motion: reduce) {
  .about-toc__list a,
  .tl__summary,
  .tl__summary::before,
  .roster tbody tr {
    transition: none;
  }
}
<<<END>>>