.page-about {
  --about-rail-w: 128px;
  --about-panel: #16474a;
  background: var(--ink-950);
  color: var(--paper);
  font-family: var(--body);
  overflow-x: hidden;
}

.page-about *,
.page-about *::before,
.page-about *::after {
  box-sizing: border-box;
}

.page-about p {
  margin: 0 0 1.05em;
}

.page-about .about-crumb {
  color: var(--paper);
  font-family: var(--mono);
  font-size: 0.78rem;
  letter-spacing: 0.06em;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  padding: 26px 0 54px;
  background:
    radial-gradient(120% 86% at 88% -12%, rgba(255, 179, 71, 0.17), rgba(255, 179, 71, 0) 62%),
    linear-gradient(168deg, var(--ink-950) 0%, var(--ink-900) 58%, var(--ink-800) 100%);
  border-bottom: 1px solid var(--line);
}

.page-about .about-hero__inner {
  display: grid;
  gap: 34px;
  margin-top: 22px;
}

.page-about .about-eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  margin: 0 0 14px;
  font-family: var(--mono);
  font-size: 0.72rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--amber);
}

.page-about .about-eyebrow::before {
  content: "";
  width: 7px;
  height: 7px;
  background: var(--lime);
}

.page-about .about-title {
  margin: 0 0 0.55em;
  font-family: var(--display);
  font-weight: 800;
  font-size: clamp(2.4rem, 10vw, 5.2rem);
  line-height: 0.96;
  letter-spacing: -0.02em;
  color: var(--paper);
}

.page-about .about-lead {
  max-width: 46ch;
  font-size: 1rem;
  line-height: 1.78;
  color: var(--paper);
  opacity: 0.86;
}

.page-about .about-mark {
  font-family: var(--mono);
  font-weight: 600;
  color: var(--amber);
  letter-spacing: 0.01em;
}

.page-about .about-hero__figure {
  margin: 0 0 20px;
  position: relative;
}

.page-about .about-hero__figure::after {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background-image: repeating-linear-gradient(0deg, rgba(36, 80, 82, 0.55) 0 1px, transparent 1px 46px);
  opacity: 0.5;
}

.page-about .about-hero__figure img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 3 / 2;
  object-fit: cover;
  clip-path: polygon(0 4%, 100% 0, 100% 96%, 0 100%);
  filter: brightness(0.8) saturate(0.88);
}

.page-about .chapter-preview {
  list-style: none;
  margin: 0;
  padding: 0;
  border-top: 1px solid var(--line);
}

.page-about .chapter-preview__link {
  display: grid;
  grid-template-columns: 34px minmax(0, 1fr) auto;
  align-items: center;
  gap: 10px;
  padding: 11px 2px;
  border-bottom: 1px solid var(--line);
  color: var(--mist);
  text-decoration: none;
  transition: color 180ms ease-out, background-color 180ms ease-out, padding-left 180ms ease-out;
}

.page-about .chapter-preview__link:hover,
.page-about .chapter-preview__link:focus-visible {
  color: var(--paper);
  background: rgba(255, 179, 71, 0.09);
  padding-left: 10px;
  outline: none;
}

.page-about .chapter-preview__link:focus-visible {
  box-shadow: inset 0 0 0 1px var(--amber);
}

.page-about .chapter-preview__num {
  font-family: var(--mono);
  font-size: 0.74rem;
  letter-spacing: 0.08em;
  color: var(--copper);
}

.page-about .chapter-preview__label {
  font-size: 0.94rem;
  line-height: 1.4;
}

.page-about .chapter-preview__meta {
  font-family: var(--mono);
  font-size: 0.72rem;
  letter-spacing: 0.04em;
  color: var(--mist);
  opacity: 0.78;
}

/* ---------- 章节骨架 ---------- */
.page-about .about-section {
  padding: 46px 0 50px;
  border-top: 1px solid var(--line);
  background: var(--ink-950);
}

.page-about .about-section--alt {
  background:
    linear-gradient(180deg, var(--ink-900) 0%, var(--ink-950) 100%);
}

.page-about .about-section__grid {
  display: grid;
  gap: 18px;
}

.page-about .about-rail {
  display: flex;
  align-items: baseline;
  gap: 12px;
  padding-top: 2px;
}

.page-about .about-rail__num {
  font-family: var(--display);
  font-weight: 800;
  font-size: 2.2rem;
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--copper);
}

.page-about .about-rail__year {
  font-family: var(--mono);
  font-size: 0.72rem;
  letter-spacing: 0.14em;
  color: var(--mist);
}

.page-about .about-rail__rule {
  display: none;
}

.page-about .about-body {
  min-width: 0;
  font-size: 1rem;
  line-height: 1.78;
  color: var(--paper);
  opacity: 0.88;
}

.page-about .about-h2 {
  margin: 0 0 0.7em;
  font-family: var(--display);
  font-weight: 700;
  font-size: clamp(1.65rem, 6vw, 2.7rem);
  line-height: 1.1;
  letter-spacing: -0.01em;
  color: var(--paper);
  opacity: 1;
}

.page-about .about-inline-link {
  color: var(--amber);
  text-decoration: none;
  border-bottom: 1px solid rgba(255, 179, 71, 0.45);
  transition: color 180ms ease-out, border-color 180ms ease-out;
}

.page-about .about-inline-link:hover,
.page-about .about-inline-link:focus-visible {
  color: var(--amber-bright);
  border-color: var(--amber-bright);
  outline: none;
}

/* ---------- 提示带 ---------- */
.page-about .about-note {
  margin: 24px 0 4px;
  padding: 16px 16px 6px;
  background: var(--ink-800);
  border-left: 2px solid var(--lime);
  opacity: 1;
}

.page-about .about-note__label {
  display: block;
  margin-bottom: 8px;
  font-family: var(--mono);
  font-size: 0.7rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--lime);
}

.page-about .about-note p {
  font-size: 0.94rem;
  line-height: 1.72;
  color: var(--paper);
  opacity: 0.86;
}

/* ---------- 团队 ---------- */
.page-about .team-grid {
  display: grid;
  gap: 1px;
  margin: 26px 0 26px;
  background: var(--line);
  border: 1px solid var(--line);
}

.page-about .team-cell {
  padding: 18px 16px 20px;
  background: var(--ink-800);
  transition: background-color 200ms ease-out;
}

.page-about .team-cell:hover {
  background: var(--about-panel);
}

.page-about .team-cell__num {
  display: block;
  font-family: var(--display);
  font-weight: 800;
  font-size: 2.3rem;
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--amber);
}

.page-about .team-cell__role {
  display: block;
  margin: 6px 0 8px;
  font-size: 0.95rem;
  font-weight: 500;
  color: var(--paper);
}

.page-about .team-cell__desc {
  margin: 0;
  font-size: 0.86rem;
  line-height: 1.65;
  color: var(--mist);
}

/* ---------- 图片框 ---------- */
.page-about .about-figure {
  margin: 28px 0;
  padding: 10px;
  background: var(--ink-800);
  border: 1px solid var(--line);
}

.page-about .about-figure img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
  filter: brightness(0.86) saturate(0.9);
}

.page-about .about-figure--team img {
  aspect-ratio: 10 / 7;
}

.page-about .about-figure--wide img {
  aspect-ratio: 7 / 3;
}

.page-about .about-figure figcaption {
  margin-top: 10px;
  font-family: var(--mono);
  font-size: 0.72rem;
  letter-spacing: 0.05em;
  line-height: 1.6;
  color: var(--mist);
}

/* ---------- 步骤路径 ---------- */
.page-about .path-list {
  list-style: none;
  margin: 20px 0 24px;
  padding: 0;
  border-top: 1px solid var(--line);
}

.page-about .path-list__item {
  display: grid;
  grid-template-columns: 64px minmax(0, 1fr);
  gap: 12px;
  align-items: start;
  padding: 14px 0;
  border-bottom: 1px solid var(--line);
}

.page-about .path-list__step {
  font-family: var(--mono);
  font-size: 0.68rem;
  letter-spacing: 0.1em;
  color: var(--lime);
  padding-top: 0.32em;
}

.page-about .path-list__text {
  font-size: 0.96rem;
  line-height: 1.7;
}

/* ---------- 版本时间轴 ---------- */
.page-about .version-list {
  list-style: none;
  margin: 28px 0 0;
  padding: 0;
  display: grid;
  gap: 20px;
}

.page-about .version-item__head {
  position: relative;
  display: flex;
  align-items: baseline;
  gap: 10px;
  padding-top: 14px;
  border-top: 1px solid var(--line);
}

.page-about .version-item__head::before {
  content: "";
  position: absolute;
  top: -4px;
  left: 0;
  width: 7px;
  height: 7px;
  background: var(--copper);
  transition: background-color 180ms ease-out;
}

.page-about .version-item:hover .version-item__head::before {
  background: var(--amber);
}

.page-about .version-item__ver {
  font-family: var(--display);
  font-weight: 800;
  font-size: 1.6rem;
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--paper);
}

.page-about .version-item__year {
  font-family: var(--mono);
  font-size: 0.72rem;
  letter-spacing: 0.12em;
  color: var(--copper);
}

.page-about .version-item__title {
  margin: 10px 0 6px;
  font-family: var(--display);
  font-weight: 700;
  font-size: 1.15rem;
  letter-spacing: 0.01em;
  color: var(--paper);
}

.page-about .version-item__desc {
  margin: 0;
  font-size: 0.88rem;
  line-height: 1.68;
  color: var(--mist);
}

/* ---------- 合作生态 ---------- */
.page-about .eco-grid {
  display: grid;
  gap: 1px;
  margin: 24px 0 22px;
  background: var(--line);
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}

.page-about .eco-cell {
  padding: 18px 16px 20px;
  background: var(--ink-900);
  transition: background-color 200ms ease-out;
}

.page-about .eco-cell:hover {
  background: var(--ink-800);
}

.page-about .eco-cell__dots {
  display: block;
  height: 26px;
  margin-bottom: 14px;
  background-image: radial-gradient(circle, var(--copper) 1px, transparent 1.5px);
  background-size: 11px 11px;
  opacity: 0.55;
  transition: opacity 200ms ease-out;
}

.page-about .eco-cell:hover .eco-cell__dots {
  opacity: 1;
}

.page-about .eco-cell__num {
  display: block;
  font-family: var(--display);
  font-weight: 800;
  font-size: 2.3rem;
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--amber);
}

.page-about .eco-cell__name {
  display: block;
  margin: 6px 0 8px;
  font-size: 0.95rem;
  font-weight: 500;
  color: var(--paper);
}

.page-about .eco-cell__desc {
  margin: 0;
  font-size: 0.86rem;
  line-height: 1.65;
  color: var(--mist);
}

/* ---------- 数据带 ---------- */
.page-about .stat-band {
  display: grid;
  gap: 1px;
  margin: 24px 0;
  background: var(--line);
  border: 1px solid var(--line);
}

.page-about .stat-cell {
  padding: 16px 16px 18px;
  background: var(--ink-800);
}

.page-about .stat-num {
  display: block;
  font-family: var(--display);
  font-weight: 800;
  font-size: 1.9rem;
  line-height: 1.05;
  letter-spacing: -0.015em;
  color: var(--amber);
}

.page-about .stat-label {
  display: block;
  margin-top: 6px;
  font-size: 0.82rem;
  letter-spacing: 0.02em;
  color: var(--mist);
}

/* ---------- 联系信息 ---------- */
.page-about .contact-dl {
  margin: 22px 0 0;
  padding: 0;
  border-top: 1px solid var(--line);
}

.page-about .contact-dl__row {
  display: grid;
  gap: 4px;
  padding: 12px 0;
  border-bottom: 1px solid var(--line);
}

.page-about .contact-dl dt {
  font-family: var(--mono);
  font-size: 0.7rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--copper);
}

.page-about .contact-dl dd {
  margin: 0;
  font-size: 0.94rem;
  line-height: 1.65;
  color: var(--paper);
  word-break: break-word;
}

/* ---------- 出口链接 ---------- */
.page-about .about-links {
  display: grid;
  gap: 1px;
  margin-top: 26px;
  background: var(--line);
  border: 1px solid var(--line);
}

.page-about .about-link {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 14px;
  padding: 16px 16px;
  background: var(--ink-800);
  color: var(--paper);
  text-decoration: none;
  font-size: 0.94rem;
  line-height: 1.55;
  transition: background-color 200ms ease-out, color 200ms ease-out;
}

.page-about .about-link:hover,
.page-about .about-link:focus-visible {
  background: rgba(255, 179, 71, 0.14);
  color: var(--amber-bright);
  outline: none;
}

.page-about .about-link:focus-visible {
  box-shadow: inset 0 0 0 1px var(--amber);
}

.page-about .about-link__arrow {
  font-family: var(--mono);
  color: var(--lime);
  flex: none;
}

/* ---------- 响应式 ---------- */
@media (min-width: 640px) {
  .page-about .about-section {
    padding: 56px 0 60px;
  }

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

  .page-about .contact-dl__row {
    grid-template-columns: 120px minmax(0, 1fr);
    align-items: baseline;
    gap: 16px;
  }

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

@media (min-width: 860px) {
  .page-about {
    --about-rail-w: 150px;
  }

  .page-about .about-hero {
    padding: 34px 0 72px;
  }

  .page-about .about-hero__inner {
    grid-template-columns: minmax(0, 1.12fr) minmax(0, 0.88fr);
    gap: 48px;
    align-items: start;
    margin-top: 30px;
  }

  .page-about .about-section__grid {
    grid-template-columns: var(--about-rail-w) minmax(0, 1fr);
    gap: 40px;
  }

  .page-about .about-rail {
    flex-direction: column;
    align-items: flex-start;
    gap: 10px;
    position: sticky;
    top: 96px;
  }

  .page-about .about-rail__num {
    font-size: 2.8rem;
  }

  .page-about .about-rail__rule {
    display: block;
    width: 1px;
    height: 80px;
    background: linear-gradient(180deg, var(--copper), rgba(36, 80, 82, 0));
  }

  .page-about .about-body {
    max-width: 760px;
  }

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

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

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

  .page-about .path-list__item {
    grid-template-columns: 78px minmax(0, 1fr);
    gap: 18px;
  }
}

@media (min-width: 1000px) {
  .page-about .version-list {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 0;
    align-items: start;
  }

  .page-about .version-item {
    padding-right: 18px;
  }

  .page-about .version-item:nth-child(1) {
    margin-top: 0;
  }

  .page-about .version-item:nth-child(2) {
    margin-top: 34px;
  }

  .page-about .version-item:nth-child(3) {
    margin-top: 68px;
  }

  .page-about .version-item:nth-child(4) {
    margin-top: 102px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .chapter-preview__link,
  .page-about .team-cell,
  .page-about .eco-cell,
  .page-about .eco-cell__dots,
  .page-about .about-link,
  .page-about .version-item__head::before,
  .page-about .about-inline-link {
    transition: none;
  }
}
<<<END>>>