.page-about {
  --about-gap: clamp(20px, 3.2vw, 40px);
  --about-measure: 62ch;
  --about-halftone: radial-gradient(rgba(111, 245, 210, .16) 1px, transparent 1px);
  --about-scan: repeating-linear-gradient(
    to bottom,
    rgba(7, 19, 15, .55) 0,
    rgba(7, 19, 15, .55) 2px,
    rgba(7, 19, 15, 0) 2px,
    rgba(7, 19, 15, 0) 5px
  );
}

/* ---------- 通用区块节奏 ---------- */
.page-about .about-block {
  padding-block: clamp(48px, 7vw, 88px);
  position: relative;
}

.page-about .about-crumbs {
  padding-top: 18px;
}

.page-about .about-head {
  display: grid;
  gap: 12px;
  padding-top: 16px;
  margin-bottom: clamp(24px, 4vw, 44px);
  border-top: var(--bw) solid var(--line);
}

.page-about .about-head__title {
  font-weight: 200;
  letter-spacing: -0.02em;
  line-height: 1.06;
  font-size: clamp(26px, 4.4vw, 46px);
  margin: 0;
  max-width: 26ch;
}

/* ---------- 报头标题组 ---------- */
.page-about .about-mast {
  padding-top: clamp(20px, 3vw, 40px);
  padding-bottom: clamp(40px, 6vw, 72px);
}

.page-about .about-mast__inner {
  display: grid;
  gap: clamp(16px, 2.6vw, 26px);
  justify-items: center;
  text-align: center;
  max-width: 940px;
  margin-inline: auto;
}

.page-about .about-mast__index {
  color: var(--accent);
}

.page-about .about-mast__title {
  font-weight: 200;
  letter-spacing: -0.025em;
  line-height: 1.02;
  font-size: clamp(32px, 7.4vw, 78px);
  margin: 0;
  color: var(--ink);
}

.page-about .about-mast__lede {
  max-width: 58ch;
  font-size: clamp(15px, 1.5vw, 17px);
  line-height: 1.78;
  color: var(--ink-soft);
  margin: 0;
}

.page-about .about-mast__facts {
  list-style: none;
  margin: clamp(10px, 2vw, 20px) 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  width: 100%;
  background: var(--line-soft);
  border: var(--bw) solid var(--line);
}

.page-about .about-mast__fact {
  background: var(--p1);
  padding: clamp(14px, 2.4vw, 22px) 12px;
  display: grid;
  gap: 6px;
  justify-items: center;
}

.page-about .about-mast__fact-num {
  font-size: clamp(20px, 3.2vw, 30px);
  color: var(--num);
  line-height: 1;
}

.page-about .about-mast__fact-label {
  color: var(--muted);
}

/* ---------- 团队 ---------- */
.page-about .about-team__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--about-gap);
  align-items: start;
}

.page-about .about-team__figure {
  margin: 0;
  display: grid;
  gap: 12px;
}

.page-about .about-team__cap,
.page-about .about-data__cap {
  font-size: 13px;
  line-height: 1.65;
  color: var(--muted);
}

.page-about .about-team__body {
  max-width: var(--about-measure);
}

.page-about .about-team__body p {
  margin-top: 0;
}

.page-about .about-roles {
  margin-top: clamp(28px, 4vw, 48px);
  display: grid;
  gap: 1px;
  border: var(--bw) solid var(--line);
  background: var(--line-soft);
}

.page-about .about-role {
  background: var(--p1);
  border: 0;
}

.page-about .about-role[open] {
  background: var(--p2);
}

.page-about .about-role__summary {
  list-style: none;
  cursor: pointer;
  display: grid;
  grid-template-columns: auto 1fr auto;
  align-items: baseline;
  gap: clamp(12px, 2vw, 24px);
  padding: clamp(16px, 2.4vw, 24px);
}

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

.page-about .about-role__summary::marker {
  content: "";
}

.page-about .about-role__num {
  font-size: 13px;
  color: var(--accent);
  letter-spacing: .04em;
}

.page-about .about-role__name {
  font-size: clamp(17px, 2.2vw, 22px);
  font-weight: 700;
  color: var(--ink);
}

.page-about .about-role__hint {
  color: var(--muted);
  white-space: nowrap;
}

.page-about .about-role__hint::after {
  content: " ＋";
}

.page-about .about-role[open] .about-role__hint::after {
  content: " －";
}

.page-about .about-role__body {
  padding: 0 clamp(16px, 2.4vw, 24px) clamp(18px, 2.4vw, 26px);
  max-width: 72ch;
}

.page-about .about-role__body p {
  margin: 0;
  font-size: 15px;
  line-height: 1.78;
  color: var(--ink-soft);
}

.page-about .about-role__summary:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 3px;
}

/* ---------- 数据流程 ---------- */
.page-about .about-flow__track {
  display: none;
  margin-bottom: -6px;
}

.page-about .about-flow__track svg {
  display: block;
  width: 100%;
  height: 20px;
}

.page-about .about-flow__track line {
  stroke: var(--line);
  stroke-width: 2;
  stroke-dasharray: 8 8;
}

.page-about .about-flow__track circle {
  fill: var(--accent);
}

.page-about .about-flow__track circle:last-of-type {
  fill: var(--focus);
}

.page-about .about-flow {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: 1fr;
  gap: 1px;
  background: var(--line-soft);
  border: var(--bw) solid var(--line);
}

.page-about .about-flow__step {
  background: var(--p1);
  padding: clamp(18px, 2.6vw, 26px);
  display: grid;
  gap: 10px;
  align-content: start;
}

.page-about .about-flow__step--hot {
  background: var(--p2);
  box-shadow: inset 0 0 0 2px var(--focus);
}

.page-about .about-flow__tag {
  color: var(--accent);
}

.page-about .about-flow__step--hot .about-flow__tag {
  color: var(--focus);
}

.page-about .about-flow__title {
  margin: 0;
  font-size: clamp(16px, 1.9vw, 19px);
  font-weight: 700;
  line-height: 1.35;
  color: var(--ink);
}

.page-about .about-flow__step p {
  margin: 0;
  font-size: 14px;
  line-height: 1.75;
  color: var(--ink-soft);
}

.page-about .about-data__figure {
  margin: clamp(28px, 4vw, 48px) 0 0;
  display: grid;
  gap: 12px;
  max-width: 860px;
}

/* ---------- 版本时间轴 ---------- */
.page-about .about-versions {
  overflow: hidden;
}

.page-about .about-versions__bg {
  position: absolute;
  inset: 0;
  pointer-events: none;
  z-index: 0;
}

.page-about .about-versions__bg img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: .16;
  display: block;
}

.page-about .about-versions .wrap,
.page-about .about-rail {
  position: relative;
  z-index: 1;
}

.page-about .about-versions__lede {
  max-width: var(--about-measure);
  margin: 0 0 clamp(24px, 3.4vw, 38px);
  color: var(--ink-soft);
}

.page-about .about-rail {
  overflow-x: auto;
  overflow-y: hidden;
  scroll-snap-type: x proximity;
  padding: 4px 0 clamp(18px, 3vw, 28px);
  -webkit-overflow-scrolling: touch;
}

.page-about .about-rail:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 4px;
}

.page-about .about-rail__list {
  list-style: none;
  margin: 0;
  padding: 0 clamp(14px, 6vw, 80px);
  display: flex;
  gap: 1px;
  background: var(--line-soft);
  width: max-content;
  border-top: var(--bw) solid var(--line);
  border-bottom: var(--bw) solid var(--line);
}

.page-about .about-rail__item {
  scroll-snap-align: start;
  background: var(--bg);
  flex: 0 0 auto;
  width: clamp(238px, 74vw, 302px);
  padding: clamp(20px, 3vw, 28px);
  display: grid;
  gap: 12px;
  align-content: start;
  position: relative;
}

.page-about .about-rail__item::before {
  content: "";
  position: absolute;
  top: 0;
  left: clamp(20px, 3vw, 28px);
  width: 10px;
  height: 10px;
  background: var(--accent);
  transform: translateY(-50%) rotate(45deg);
}

.page-about .about-rail__item--hot {
  background: var(--p2);
}

.page-about .about-rail__item--hot::before {
  background: var(--focus);
}

.page-about .about-rail__tag {
  color: var(--muted);
}

.page-about .about-rail__item--hot .about-rail__tag {
  color: var(--focus);
}

.page-about .about-rail__title {
  margin: 0;
  font-size: clamp(17px, 2vw, 20px);
  font-weight: 700;
  line-height: 1.3;
  color: var(--ink);
}

.page-about .about-rail__item p {
  margin: 0;
  font-size: 14px;
  line-height: 1.75;
  color: var(--ink-soft);
}

.page-about .about-legacy {
  margin-top: clamp(28px, 4vw, 44px);
  padding: clamp(20px, 3vw, 32px);
  display: grid;
  gap: 12px;
  max-width: 780px;
}

.page-about .about-legacy__label {
  color: var(--focus);
}

.page-about .about-legacy__text {
  margin: 0;
  font-size: 15px;
  line-height: 1.78;
  color: var(--ink-soft);
}

.page-about .about-legacy__actions {
  gap: 12px;
  margin-top: 4px;
}

/* ---------- 合作 ---------- */
.page-about .about-partners__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: 1fr;
  gap: 1px;
  background: var(--line-soft);
  border: var(--bw) solid var(--line);
}

.page-about .about-partners__item {
  background: var(--p1);
  padding: clamp(20px, 3vw, 32px);
  display: grid;
  gap: 10px;
  align-content: start;
  transition: background var(--t) var(--ease), box-shadow var(--t) var(--ease);
}

.page-about .about-partners__item:hover,
.page-about .about-partners__item:focus-visible {
  background: var(--p2);
  box-shadow: inset 0 0 0 2px var(--accent);
}

.page-about .about-partners__item:focus-visible {
  outline: none;
}

.page-about .about-partners__num {
  font-size: clamp(32px, 6vw, 54px);
  line-height: .95;
  color: var(--accent);
}

.page-about .about-partners__item:last-child .about-partners__num {
  color: var(--focus);
}

.page-about .about-partners__name {
  font-size: clamp(15px, 1.8vw, 17px);
  font-weight: 700;
  color: var(--ink);
}

.page-about .about-partners__desc {
  margin: 0;
  font-size: 14px;
  line-height: 1.75;
  color: var(--muted);
  transition: color var(--t) var(--ease);
}

.page-about .about-partners__item:hover .about-partners__desc,
.page-about .about-partners__item:focus-visible .about-partners__desc {
  color: var(--ink-soft);
}

/* ---------- 使用者 ---------- */
.page-about .about-audience__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--about-gap);
}

.page-about .about-aud {
  padding: clamp(20px, 3vw, 32px);
  display: grid;
  gap: 12px;
  align-content: start;
  border-left: var(--bw) solid var(--accent);
}

.page-about .about-aud:nth-child(2) {
  border-left-color: var(--accent2);
}

.page-about .about-aud:nth-child(3) {
  border-left-color: var(--focus);
}

.page-about .about-aud__tag {
  color: var(--muted);
}

.page-about .about-aud__title {
  margin: 0;
  font-size: clamp(17px, 2vw, 21px);
  font-weight: 700;
  line-height: 1.32;
  color: var(--ink);
}

.page-about .about-aud__text {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.78;
  color: var(--ink-soft);
}

.page-about .about-audience__note {
  margin: clamp(24px, 3.4vw, 36px) 0 0;
  padding-top: 18px;
  border-top: var(--bw) solid var(--line);
  max-width: var(--about-measure);
  font-size: 14px;
  line-height: 1.78;
  color: var(--muted);
}

/* ---------- 结尾 ---------- */
.page-about .about-next {
  padding-bottom: clamp(56px, 8vw, 104px);
}

.page-about .about-next__inner {
  display: grid;
  gap: clamp(20px, 3vw, 36px);
  align-items: end;
  padding-top: clamp(24px, 3.4vw, 40px);
  border-top: var(--bw) solid var(--line);
}

.page-about .about-next__body {
  display: grid;
  gap: 12px;
  max-width: 56ch;
}

.page-about .about-next__title {
  font-weight: 200;
  margin: 0;
}

.page-about .about-next__text {
  margin: 0;
  font-size: 15px;
  line-height: 1.78;
  color: var(--ink-soft);
}

.page-about .about-next__actions {
  gap: 12px;
}

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

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

  .page-about .about-partners__item:last-child {
    grid-column: 1 / -1;
  }
}

@media (min-width: 820px) {
  .page-about .about-team__grid {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1.05fr);
    gap: clamp(28px, 4vw, 56px);
  }

  .page-about .about-flow__track {
    display: block;
  }

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

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

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

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

  .page-about .about-partners__item:last-child {
    grid-column: auto;
  }
}

@media (min-width: 1100px) {
  .page-about .about-rail__list {
    padding-inline: max(20px, calc((100vw - 1240px) / 2 + 20px));
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-partners__item,
  .page-about .about-partners__desc {
    transition: none;
  }

  .page-about .about-rail {
    scroll-behavior: auto;
  }
}
<<<END>>>