.page-about {
  --about-toc-w: 176px;
  --about-line: 1px solid var(--rx-stroke);
  background: var(--rx-void);
  color: var(--rx-ink);
  font-family: var(--rx-font-cn);
  padding-bottom: clamp(48px, 8vw, 96px);
}

/* ===== 面包屑 ===== */
.page-about .rx-breadcrumb {
  padding-top: clamp(16px, 3vw, 28px);
}

/* ===== 首屏 ===== */
.page-about .about-hero {
  padding: clamp(28px, 5vw, 56px) 0 clamp(28px, 5vw, 52px);
  max-width: 76ch;
  border-bottom: var(--about-line);
}

.page-about .about-hero__title {
  margin: 14px 0 0;
  font-size: var(--rx-fs-display);
  font-weight: 800;
  letter-spacing: -0.02em;
  line-height: 1.12;
  color: var(--rx-ink);
  max-width: 22ch;
}

.page-about .about-hero__title::after {
  content: "";
  display: block;
  width: 72px;
  height: 3px;
  margin-top: 22px;
  background: var(--rx-cyan);
}

.page-about .about-hero__lead {
  margin: 22px 0 0;
  font-size: var(--rx-fs-body);
  line-height: 1.75;
  color: var(--rx-ink-dim);
  max-width: 62ch;
}

.page-about .about-hero__note {
  margin: 16px 0 0;
  font-size: var(--rx-fs-small);
  line-height: 1.7;
  color: var(--rx-mute);
  max-width: 60ch;
}

/* ===== 主体骨架 ===== */
.page-about .about-body {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(20px, 4vw, 40px);
  padding-top: clamp(28px, 5vw, 56px);
}

/* ===== 章节刻度线 ===== */
.page-about .about-toc__title {
  margin: 0 0 10px;
  font-family: var(--rx-font-mono);
  font-size: var(--rx-fs-mono);
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--rx-mute);
}

.page-about .about-toc__list {
  display: flex;
  gap: 6px;
  margin: 0;
  padding: 0 0 10px;
  list-style: none;
  overflow-x: auto;
  scrollbar-width: none;
  border-bottom: var(--about-line);
}

.page-about .about-toc__list::-webkit-scrollbar {
  display: none;
}

.page-about .about-toc__item {
  flex: none;
}

.page-about .about-toc__link {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 7px 12px 7px 8px;
  color: var(--rx-mute);
  text-decoration: none;
  font-size: 13px;
  white-space: nowrap;
  border: 1px solid transparent;
  transition: color 0.18s ease, border-color 0.18s ease, background-color 0.18s ease;
}

.page-about .about-toc__dot {
  width: 7px;
  height: 7px;
  flex: none;
  border: 1px solid currentColor;
  transform: rotate(45deg);
  transition: background-color 0.18s ease, border-color 0.18s ease;
}

.page-about .about-toc__link:hover,
.page-about .about-toc__link:focus-visible {
  color: var(--rx-ink);
  border-color: var(--rx-stroke);
}

/* 点击章节后高亮当前刻度（纯 CSS） */
.page-about:has(#origin:target) .about-toc__link[href="#origin"],
.page-about:has(#scope:target) .about-toc__link[href="#scope"],
.page-about:has(#team:target) .about-toc__link[href="#team"],
.page-about:has(#stages:target) .about-toc__link[href="#stages"],
.page-about:has(#ecosystem:target) .about-toc__link[href="#ecosystem"] {
  color: var(--rx-cyan);
  background: var(--rx-cyan-fill);
  border-color: rgba(34, 224, 200, 0.4);
}

.page-about:has(#origin:target) .about-toc__link[href="#origin"] .about-toc__dot,
.page-about:has(#scope:target) .about-toc__link[href="#scope"] .about-toc__dot,
.page-about:has(#team:target) .about-toc__link[href="#team"] .about-toc__dot,
.page-about:has(#stages:target) .about-toc__link[href="#stages"] .about-toc__dot,
.page-about:has(#ecosystem:target) .about-toc__link[href="#ecosystem"] .about-toc__dot {
  background: var(--rx-cyan);
  border-color: var(--rx-cyan);
  box-shadow: 0 0 0 3px rgba(34, 224, 200, 0.16);
}

/* ===== 内容流 ===== */
.page-about .about-flow {
  display: grid;
  gap: clamp(28px, 5vw, 64px);
  min-width: 0;
}

.page-about .about-panel {
  scroll-margin-top: 104px;
}

.page-about .about-panel__lead {
  margin: 14px 0 0;
  font-size: var(--rx-fs-body);
  line-height: 1.75;
  color: var(--rx-ink-dim);
  max-width: 62ch;
}

.page-about .about-panel__tail {
  margin: 20px 0 0;
  padding-top: 16px;
  border-top: var(--about-line);
  font-size: var(--rx-fs-small);
  line-height: 1.75;
  color: var(--rx-mute);
  max-width: 60ch;
}

.page-about .about-stamp {
  margin: 16px 0 0;
}

/* ===== 面板 01 / 03：图文分栏 ===== */
.page-about .about-split {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(20px, 3vw, 32px);
  margin-top: 20px;
}

.page-about .about-split__text h2 {
  margin-top: 0;
}

.page-about .about-split__text p {
  margin: 16px 0 0;
  font-size: var(--rx-fs-body);
  line-height: 1.75;
  color: var(--rx-ink-dim);
  max-width: 62ch;
}

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

.page-about .about-split__media .rx-media__frame {
  aspect-ratio: 5 / 7;
  overflow: hidden;
  border: var(--about-line);
  background: var(--rx-raise);
}

.page-about .about-split__media--square .rx-media__frame {
  aspect-ratio: 1 / 1;
}

.page-about .about-split__media img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
  filter: saturate(0.72) contrast(1.05) brightness(0.92);
}

.page-about .rx-media__caption {
  margin-top: 10px;
  font-family: var(--rx-font-mono);
  font-size: var(--rx-fs-mono);
  letter-spacing: 0.1em;
  color: var(--rx-mute);
}

/* ===== 面板 02：规模数字带 ===== */
.page-about .about-scale {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1px;
  margin-top: 24px;
  background: var(--rx-stroke);
  border: var(--about-line);
  box-shadow: var(--rx-shadow-soft);
}

.page-about .about-scale__item {
  display: grid;
  gap: 4px;
  align-content: start;
  padding: clamp(20px, 3vw, 32px);
  background: var(--rx-panel);
}

.page-about .about-scale__num {
  display: block;
  font-size: clamp(46px, 9vw, 86px);
  line-height: 1;
  letter-spacing: 0.02em;
  color: var(--rx-cyan);
}

.page-about .about-scale__label {
  font-size: var(--rx-fs-small);
  color: var(--rx-ink);
  letter-spacing: 0.02em;
}

.page-about .about-scale__note {
  margin: 8px 0 0;
  font-size: 13px;
  line-height: 1.7;
  color: var(--rx-mute);
  max-width: 34ch;
}

@keyframes about-num-in {
  from {
    opacity: 0;
    transform: translateY(0.35em);
  }
  to {
    opacity: 1;
    transform: none;
  }
}

.page-about .about-scale.is-inview .about-scale__num {
  animation: about-num-in 0.42s cubic-bezier(0.22, 0.68, 0.35, 1) both;
}

.page-about .about-scale.is-inview .about-scale__item:nth-child(2) .about-scale__num {
  animation-delay: 0.08s;
}

.page-about .about-scale.is-inview .about-scale__item:nth-child(3) .about-scale__num {
  animation-delay: 0.16s;
}

.page-about .about-wide {
  margin: clamp(24px, 4vw, 40px) 0 0;
}

.page-about .about-wide .rx-media__frame {
  aspect-ratio: 16 / 7;
  overflow: hidden;
  border: var(--about-line);
  background: var(--rx-raise);
}

.page-about .about-wide img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
  filter: saturate(0.68) contrast(1.06) brightness(0.9);
}

/* ===== 面板 03：角色列表 ===== */
.page-about .about-roles {
  margin: 22px 0 0;
  padding: 0;
  list-style: none;
  border-top: var(--about-line);
}

.page-about .about-roles__item {
  display: grid;
  grid-template-columns: 46px minmax(0, 1fr);
  gap: 14px;
  padding: 16px 0;
  border-bottom: var(--about-line);
}

.page-about .about-roles__no {
  font-size: 26px;
  line-height: 1.1;
  color: var(--rx-violet);
}

.page-about .about-roles__name {
  margin: 0;
  font-size: var(--rx-fs-h3);
  font-weight: 800;
  letter-spacing: -0.01em;
  color: var(--rx-ink);
}

.page-about .about-roles__item p {
  margin: 6px 0 0;
  font-size: var(--rx-fs-small);
  line-height: 1.75;
  color: var(--rx-mute);
  max-width: 52ch;
}

/* ===== 面板 04：版本卡片 ===== */
.page-about .about-stages {
  display: grid;
  gap: 14px;
  margin-top: 24px;
}

.page-about .about-stage {
  position: relative;
  background: var(--rx-panel);
  border: var(--about-line);
  box-shadow: var(--rx-shadow-soft);
  transition: box-shadow 0.24s ease, border-color 0.24s ease;
}

.page-about .about-stage::after {
  content: "";
  position: absolute;
  inset: 4px;
  border: 1px solid rgba(36, 49, 79, 0.6);
  pointer-events: none;
  transition: border-color 0.24s ease;
}

.page-about .about-stage[open] {
  border-color: var(--rx-cyan-soft);
  box-shadow: var(--rx-shadow-lift);
}

.page-about .about-stage[open]::after {
  border-color: rgba(34, 224, 200, 0.28);
}

.page-about .about-stage__sum {
  position: relative;
  z-index: 1;
  display: flex;
  align-items: center;
  gap: 14px;
  padding: 18px 20px;
  cursor: pointer;
  list-style: none;
}

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

.page-about .about-stage__sum:focus-visible {
  outline: 1px solid var(--rx-cyan);
  outline-offset: -3px;
}

.page-about .about-stage__v {
  flex: none;
  padding: 4px 8px;
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--rx-violet);
  border: 1px solid rgba(122, 77, 255, 0.45);
  background: var(--rx-violet-fill);
}

.page-about .about-stage[open] .about-stage__v {
  color: var(--rx-cyan);
  border-color: rgba(34, 224, 200, 0.45);
  background: var(--rx-cyan-fill);
}

.page-about .about-stage__name {
  font-size: clamp(17px, 2vw, 20px);
  font-weight: 800;
  letter-spacing: -0.01em;
  color: var(--rx-ink);
}

.page-about .about-stage__cue {
  position: relative;
  flex: none;
  width: 20px;
  height: 20px;
  margin-left: auto;
  border: 1px solid var(--rx-stroke);
}

.page-about .about-stage__cue::before,
.page-about .about-stage__cue::after {
  content: "";
  position: absolute;
  background: var(--rx-mute);
  transition: transform 0.24s ease, background-color 0.24s ease;
}

.page-about .about-stage__cue::before {
  left: 4px;
  right: 4px;
  top: 50%;
  height: 1px;
  margin-top: -0.5px;
}

.page-about .about-stage__cue::after {
  top: 4px;
  bottom: 4px;
  left: 50%;
  width: 1px;
  margin-left: -0.5px;
}

.page-about .about-stage[open] .about-stage__cue::before {
  background: var(--rx-cyan);
}

.page-about .about-stage[open] .about-stage__cue::after {
  transform: scaleY(0);
}

.page-about .about-stage__body {
  position: relative;
  z-index: 1;
  padding: 0 20px 20px;
  border-top: var(--about-line);
  margin: 0 20px;
  padding-left: 0;
  padding-right: 0;
}

.page-about .about-stage__body p {
  margin: 16px 0 0;
  font-size: var(--rx-fs-small);
  line-height: 1.8;
  color: var(--rx-ink-dim);
  max-width: 66ch;
}

/* ===== 面板 05：荣誉索引 ===== */
.page-about .about-honor {
  margin: 24px 0 0;
  padding: 0;
  list-style: none;
  counter-reset: honor;
}

.page-about .about-honor__item {
  display: grid;
  grid-template-columns: 52px minmax(0, 1fr);
  gap: 16px;
  padding: 20px 0;
  border-top: var(--about-line);
}

.page-about .about-honor__item:last-child {
  border-bottom: var(--about-line);
}

.page-about .about-honor__no {
  font-size: 20px;
  line-height: 1.4;
  color: var(--rx-cyan);
  letter-spacing: 0.08em;
}

.page-about .about-honor__title {
  margin: 0;
  font-size: var(--rx-fs-h3);
  font-weight: 800;
  letter-spacing: -0.01em;
  line-height: 1.35;
  color: var(--rx-ink);
}

.page-about .about-honor__body p {
  margin: 8px 0 0;
  font-size: var(--rx-fs-small);
  line-height: 1.75;
  color: var(--rx-mute);
  max-width: 58ch;
}

/* ===== 尾段 ===== */
.page-about .about-next {
  padding: clamp(24px, 4vw, 40px);
  background: var(--rx-raise);
  border: var(--about-line);
  box-shadow: var(--rx-shadow-lift);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 22px), calc(100% - 22px) 100%, 0 100%);
}

.page-about .about-next__head {
  max-width: 46ch;
}

.page-about .about-next__title {
  margin: 10px 0 0;
  font-size: var(--rx-fs-h2);
  font-weight: 800;
  letter-spacing: -0.02em;
  line-height: 1.2;
  color: var(--rx-ink);
}

.page-about .about-next__list {
  display: grid;
  grid-template-columns: 1fr;
  gap: 18px;
  margin: 24px 0 0;
  padding: 0;
  list-style: none;
}

.page-about .about-next__item {
  display: grid;
  align-content: start;
  gap: 10px;
  padding: 18px;
  background: var(--rx-panel);
  border: var(--about-line);
}

.page-about .about-next__item-title {
  margin: 0;
  font-size: 17px;
  font-weight: 800;
  letter-spacing: -0.01em;
  color: var(--rx-ink);
}

.page-about .about-next__item p {
  margin: 0;
  font-size: 13px;
  line-height: 1.7;
  color: var(--rx-mute);
}

.page-about .about-next__item .rx-btn {
  justify-self: start;
  margin-top: 4px;
}

.page-about .about-next__action {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 12px;
  margin-top: 24px;
  padding-top: 20px;
  border-top: var(--about-line);
}

.page-about .about-next__action .rx-note {
  margin: 0;
}

/* ===== 平板与桌面 ===== */
@media (min-width: 700px) {
  .page-about .about-scale {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

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

@media (min-width: 960px) {
  .page-about .about-body {
    grid-template-columns: var(--about-toc-w) minmax(0, 1fr);
    gap: clamp(28px, 4vw, 60px);
  }

  .page-about .about-toc {
    position: sticky;
    top: 104px;
    align-self: start;
  }

  .page-about .about-toc__list {
    flex-direction: column;
    gap: 0;
    padding: 0;
    overflow: visible;
    border-bottom: 0;
    border-left: var(--about-line);
  }

  .page-about .about-toc__item {
    flex: initial;
  }

  .page-about .about-toc__link {
    width: 100%;
    padding: 11px 12px 11px 16px;
    border: 0;
    border-left: 2px solid transparent;
    margin-left: -1px;
    font-size: 13.5px;
  }

  .page-about .about-toc__link:hover,
  .page-about .about-toc__link:focus-visible {
    border-color: transparent;
    border-left-color: var(--rx-stroke);
    background: rgba(36, 49, 79, 0.24);
  }

  .page-about:has(#origin:target) .about-toc__link[href="#origin"],
  .page-about:has(#scope:target) .about-toc__link[href="#scope"],
  .page-about:has(#team:target) .about-toc__link[href="#team"],
  .page-about:has(#stages:target) .about-toc__link[href="#stages"],
  .page-about:has(#ecosystem:target) .about-toc__link[href="#ecosystem"] {
    border-left-color: var(--rx-cyan);
    background: var(--rx-cyan-fill);
  }

  .page-about .about-split {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    gap: clamp(24px, 3vw, 44px);
    align-items: start;
  }

  .page-about .about-split--flip {
    grid-template-columns: minmax(0, 5fr) minmax(0, 7fr);
  }

  .page-about .about-split--flip .about-split__media {
    order: -1;
  }

  .page-about .about-split__media {
    position: sticky;
    top: 112px;
  }

  .page-about .about-stage__sum {
    padding: 20px 26px;
  }

  .page-about .about-stage__body {
    margin: 0 26px;
    padding-bottom: 22px;
  }

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

@media (min-width: 1180px) {
  .page-about .about-toc {
    top: 112px;
  }

  .page-about .about-next {
    padding: clamp(32px, 3vw, 48px);
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-scale.is-inview .about-scale__num {
    animation: none;
  }

  .page-about .about-stage,
  .page-about .about-stage::after,
  .page-about .about-stage__cue::before,
  .page-about .about-stage__cue::after,
  .page-about .about-toc__link,
  .page-about .about-toc__dot {
    transition: none;
  }
}
<<<END>>>