.page-about {
  --about-measure: 34em;
  overflow-x: clip;
  background: var(--void);
  color: var(--silver);
  position: relative;
}

.page-about .about-wrap {
  width: min(100% - (var(--gutter) * 2), var(--shell));
  margin-inline: auto;
}

.page-about .mono {
  font-family: var(--font-mono);
}

/* 面包屑与首屏 */
.page-about .about-crumb {
  padding-top: clamp(18px, 3vw, 32px);
}

.page-about .about-hero {
  position: relative;
  padding-block: clamp(30px, 5vw, 64px) clamp(36px, 5vw, 68px);
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  inset: -12% -40% 0 -40%;
  background-image:
    linear-gradient(var(--line) 1px, transparent 1px),
    linear-gradient(90deg, var(--line) 1px, transparent 1px);
  background-size: 72px 72px;
  opacity: 0.4;
  -webkit-mask-image: radial-gradient(ellipse at 28% 12%, #000 0%, transparent 68%);
  mask-image: radial-gradient(ellipse at 28% 12%, #000 0%, transparent 68%);
  pointer-events: none;
  z-index: 0;
}

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

.page-about .about-hero__index {
  display: flex;
  align-items: center;
  gap: 12px;
  margin: 0 0 clamp(16px, 2.6vw, 26px);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.18em;
  color: var(--signal);
}

.page-about .about-hero__rule {
  display: inline-block;
  width: 52px;
  height: 1px;
  background: linear-gradient(90deg, var(--signal), transparent);
}

.page-about .about-hero__title {
  margin: 0 0 clamp(20px, 3vw, 34px);
  font-family: var(--font-display);
  font-weight: 300;
  font-size: clamp(36px, 8.4vw, 92px);
  line-height: 1.06;
  letter-spacing: 0.02em;
  color: var(--silver);
}

.page-about .about-hero__title span {
  display: block;
}

.page-about .about-hero__title-alt {
  color: var(--mist);
}

.page-about .about-hero__lede {
  max-width: 40em;
  margin: 0 0 clamp(26px, 4vw, 42px);
  font-size: 16.5px;
  line-height: 1.9;
  color: var(--mist);
}

.page-about .about-strip {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
}

.page-about .about-strip__cell {
  background: var(--deep);
  padding: 16px 18px;
}

.page-about .about-strip__k {
  margin: 0 0 6px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.16em;
  color: var(--signal);
}

.page-about .about-strip__v {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.6;
  color: var(--silver);
}

/* 轨道索引 + 正文 */
.page-about .about-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(26px, 4vw, 44px);
  padding-bottom: clamp(48px, 7vw, 96px);
}

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

.page-about .about-rail__label {
  margin: 0 0 14px;
  font-size: 11px;
  letter-spacing: 0.2em;
  color: var(--mist);
}

.page-about .about-rail__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 2px;
}

.page-about .about-rail__link {
  display: flex;
  align-items: baseline;
  gap: 10px;
  padding: 8px 0 8px 12px;
  border-left: 1px solid var(--line);
  color: var(--mist);
  font-size: 13.5px;
  line-height: 1.5;
  text-decoration: none;
  transition: color 0.2s var(--ease), border-color 0.2s var(--ease);
}

.page-about .about-rail__link .mono {
  font-size: 11px;
  letter-spacing: 0.12em;
  color: var(--nebula);
}

.page-about .about-rail__link:hover,
.page-about .about-rail__link:focus-visible,
.page-about .about-rail__link.is-active {
  color: var(--silver);
  border-left-color: var(--ember);
}

.page-about .about-main {
  min-width: 0;
}

.page-about .about-sec {
  padding-block: clamp(34px, 5vw, 58px);
  border-top: 1px solid var(--line);
}

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

.page-about .about-eyebrow {
  display: flex;
  align-items: center;
  gap: 10px;
  margin: 0 0 14px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.18em;
  color: var(--signal);
}

.page-about .about-eyebrow .mono {
  color: var(--nebula);
}

.page-about .about-sec__title {
  margin: 0 0 clamp(16px, 2.4vw, 24px);
  font-family: var(--font-display);
  font-weight: 600;
  font-size: clamp(23px, 3.4vw, 36px);
  line-height: 1.28;
  letter-spacing: 0.01em;
  color: var(--silver);
}

.page-about .about-p {
  max-width: var(--about-measure);
  margin: 0 0 16px;
  font-size: 16.5px;
  line-height: 1.9;
  color: var(--mist);
}

.page-about .about-p--spaced {
  margin-top: clamp(20px, 3vw, 28px);
}

.page-about .about-note {
  max-width: var(--about-measure);
  margin-top: clamp(20px, 3vw, 28px);
  padding: 4px 0 4px 16px;
  border-left: 2px solid var(--ember);
}

.page-about .about-note__k {
  margin: 0 0 6px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.16em;
  color: var(--ember);
}

.page-about .about-note__v {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.75;
  color: var(--silver);
}

/* 图片容器 */
.page-about .about-figure {
  margin: 0 0 clamp(22px, 3vw, 32px);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
  background: linear-gradient(135deg, var(--deep), var(--void));
}

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

/* 版本时间线 */
.page-about .timeline {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 14px;
}

.page-about .tl-item {
  display: grid;
  grid-template-columns: 26px minmax(0, 1fr);
  gap: 12px;
}

.page-about .tl-item__mark {
  position: relative;
  display: flex;
  justify-content: center;
}

.page-about .tl-item__mark::before {
  content: "";
  position: absolute;
  top: 0;
  bottom: -14px;
  width: 1px;
  background: var(--line);
}

.page-about .tl-item:last-child .tl-item__mark::before {
  background: linear-gradient(180deg, var(--line), transparent);
}

.page-about .tl-item__dot {
  position: relative;
  z-index: 1;
  width: 11px;
  height: 11px;
  margin-top: 26px;
  border-radius: 50%;
  border: 2px solid var(--nebula);
  background: var(--void);
}

.page-about .tl-item--current .tl-item__dot {
  border-color: var(--ember);
  box-shadow: 0 0 0 4px rgba(255, 138, 61, 0.16);
}

.page-about .tl-item__body {
  padding: 18px 18px 20px;
  background: var(--deep);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  transition: transform 0.22s var(--ease), border-color 0.22s var(--ease), box-shadow 0.22s var(--ease);
}

.page-about .tl-item__body:hover,
.page-about .tl-item__body:focus-within {
  transform: translateY(-2px);
  border-color: rgba(123, 92, 255, 0.55);
  box-shadow: 0 14px 30px rgba(0, 0, 0, 0.36);
}

.page-about .tl-item--current .tl-item__body {
  background: linear-gradient(150deg, rgba(255, 138, 61, 0.1), transparent 62%), var(--deep);
  border-color: rgba(255, 138, 61, 0.4);
}

.page-about .tl-item__phase {
  margin: 0 0 8px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.16em;
  color: var(--signal);
}

.page-about .tl-item--current .tl-item__phase {
  color: var(--ember);
}

.page-about .tl-item__title {
  margin: 0 0 8px;
  font-family: var(--font-display);
  font-size: 18px;
  font-weight: 600;
  line-height: 1.4;
  color: var(--silver);
}

.page-about .tl-item__text {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.8;
  color: var(--mist);
}

/* 资料库 */
.page-about .archive-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 14px;
  margin-bottom: clamp(22px, 3vw, 34px);
}

.page-about .archive-card {
  padding: 18px 18px 20px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: linear-gradient(158deg, rgba(123, 92, 255, 0.12), transparent 66%), var(--deep);
}

.page-about .archive-card__cat {
  margin: 0 0 8px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.16em;
  color: var(--nebula);
}

.page-about .archive-card__title {
  margin: 0 0 6px;
  font-size: 15.5px;
  font-weight: 600;
  line-height: 1.5;
  color: var(--silver);
}

.page-about .archive-card__text {
  margin: 0;
  font-size: 14px;
  line-height: 1.8;
  color: var(--mist);
}

.page-about .about-paper {
  margin-top: clamp(22px, 3vw, 32px);
  padding: clamp(20px, 3.4vw, 32px);
  background: var(--paper);
  color: var(--ink);
  border-radius: var(--radius);
  box-shadow: 6px 6px 0 0 rgba(123, 92, 255, 0.32), 12px 12px 0 0 rgba(52, 214, 232, 0.14);
}

.page-about .about-paper__k {
  margin: 0 0 10px;
  font-family: var(--font-mono);
  font-size: 10.5px;
  letter-spacing: 0.16em;
  color: rgba(16, 19, 28, 0.6);
}

.page-about .about-paper__title {
  margin: 0 0 16px;
  font-family: var(--font-display);
  font-size: clamp(18px, 2.6vw, 23px);
  font-weight: 600;
  line-height: 1.4;
  color: var(--ink);
}

.page-about .about-paper__steps {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 10px;
}

.page-about .about-paper__step {
  display: grid;
  grid-template-columns: 26px minmax(0, 1fr);
  gap: 10px;
  font-size: 14px;
  line-height: 1.75;
  color: rgba(16, 19, 28, 0.82);
}

.page-about .about-paper__step strong {
  color: var(--ink);
}

.page-about .about-paper__num {
  font-family: var(--font-mono);
  font-size: 12px;
  color: #3d2f8f;
  padding-top: 2px;
}

.page-about .about-paper__foot {
  margin: 18px 0 0;
  padding-top: 14px;
  border-top: 1px solid rgba(16, 19, 28, 0.16);
  font-size: 13.5px;
  line-height: 1.8;
  color: rgba(16, 19, 28, 0.72);
}

/* 团队 */
.page-about .team-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(20px, 3vw, 32px);
}

.page-about .team-figure {
  margin: 0;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
  background: linear-gradient(150deg, var(--deep), var(--void));
}

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

.page-about .team-body {
  min-width: 0;
}

.page-about .team-roles {
  list-style: none;
  margin: clamp(18px, 2.6vw, 24px) 0 0;
  padding: 0;
  display: grid;
  gap: 12px;
}

.page-about .team-role {
  display: grid;
  grid-template-columns: 44px minmax(0, 1fr);
  gap: 12px;
  padding: 14px 16px;
  border: 1px solid var(--line);
  border-radius: 12px;
  background: rgba(11, 18, 36, 0.72);
}

.page-about .team-role__num {
  font-family: var(--font-mono);
  font-size: 20px;
  line-height: 1;
  color: var(--signal);
  padding-top: 2px;
}

.page-about .team-role__name {
  margin: 0 0 4px;
  font-size: 15px;
  font-weight: 600;
  color: var(--silver);
}

.page-about .team-role__desc {
  margin: 0;
  font-size: 14px;
  line-height: 1.75;
  color: var(--mist);
}

/* 覆盖与协作 */
.page-about .reach-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 14px;
  margin-top: clamp(20px, 3vw, 28px);
}

.page-about .reach-card {
  padding: clamp(18px, 2.6vw, 24px);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: radial-gradient(circle at 84% 0%, rgba(52, 214, 232, 0.16), transparent 62%), var(--deep);
}

.page-about .reach-card__num {
  margin: 0 0 10px;
  font-family: var(--font-display);
  font-weight: 300;
  font-size: clamp(34px, 5vw, 50px);
  line-height: 1;
  letter-spacing: 0.02em;
  color: var(--silver);
}

.page-about .reach-card__title {
  margin: 0 0 8px;
  font-size: 15px;
  font-weight: 600;
  line-height: 1.55;
  color: var(--signal);
}

.page-about .reach-card__text {
  margin: 0;
  font-size: 14px;
  line-height: 1.8;
  color: var(--mist);
}

/* 下一步 */
.page-about .about-outro {
  border-top: 1px solid var(--line);
}

.page-about .outro-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 12px;
  margin-top: clamp(20px, 3vw, 28px);
}

.page-about .outro-card {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: 18px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--deep);
  text-decoration: none;
  transition: transform 0.22s var(--ease), border-color 0.22s var(--ease), background-color 0.22s var(--ease);
}

.page-about .outro-card:hover,
.page-about .outro-card:focus-visible {
  transform: translateY(-3px);
  border-color: var(--ember);
  background: rgba(255, 138, 61, 0.08);
}

.page-about .outro-card__k {
  font-family: var(--font-mono);
  font-size: 10.5px;
  letter-spacing: 0.16em;
  color: var(--ember);
}

.page-about .outro-card__t {
  font-size: 16.5px;
  font-weight: 600;
  color: var(--silver);
}

.page-about .outro-card__d {
  font-size: 13.5px;
  line-height: 1.7;
  color: var(--mist);
}

/* 断点 */
@media (min-width: 640px) {
  .page-about .about-strip {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

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

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

@media (min-width: 760px) {
  .page-about .reach-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (min-width: 860px) {
  .page-about .team-grid {
    grid-template-columns: 300px minmax(0, 1fr);
    align-items: start;
  }
}

@media (min-width: 1080px) {
  .page-about .about-layout {
    grid-template-columns: 176px minmax(0, 1fr);
    gap: clamp(36px, 5vw, 64px);
    align-items: start;
  }

  .page-about .about-rail {
    display: block;
    position: sticky;
    top: calc(var(--header-h) + 36px);
  }

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

@media (prefers-reduced-motion: reduce) {
  .page-about .tl-item__body,
  .page-about .outro-card,
  .page-about .about-rail__link {
    transition: none;
  }

  .page-about .tl-item__body:hover,
  .page-about .tl-item__body:focus-within,
  .page-about .outro-card:hover,
  .page-about .outro-card:focus-visible {
    transform: none;
  }
}
<<<END>>>