.page-about {
  --about-line: rgba(244, 237, 228, 0.3);
  --about-paper-soft: rgba(244, 237, 228, 0.78);
  background: var(--paper);
  color: var(--ink);
  padding-bottom: 56px;
  overflow-x: hidden;
}

.page-about .about-crumb {
  padding-block: 18px 0;
}

.page-about .about-kicker {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.18em;
  color: var(--clay);
  text-transform: uppercase;
}

.page-about .about-kicker--light {
  color: var(--card-yellow);
}

.page-about .about-h2 {
  margin: 10px 0 0;
  font-family: var(--font-serif);
  font-weight: 600;
  font-size: clamp(23px, 5vw, 34px);
  line-height: 1.28;
  letter-spacing: -0.01em;
}

.page-about .about-h2--light {
  color: var(--paper);
}

.page-about .about-p {
  margin: 14px 0 0;
  font-size: 16px;
  line-height: 1.78;
  max-width: 38em;
}

.page-about .about-p--light {
  color: var(--about-paper-soft);
}

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

.page-about .about-fig .media {
  display: block;
  border: 3px solid var(--ink-blue);
  box-shadow: var(--hard-shadow);
  border-radius: var(--radius);
  overflow: hidden;
  background: var(--paper-2);
}

.page-about .about-fig .media img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
  filter: saturate(0.88) sepia(0.08);
}

.page-about .about-fig .media__caption {
  margin-top: 8px;
  font-size: 12px;
  line-height: 1.6;
  color: var(--ink-soft);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  padding-block: 20px 36px;
}

.page-about .about-hero__grid {
  display: grid;
  gap: 26px;
}

.page-about .about-hero__title {
  margin: 12px 0 0;
  font-family: var(--font-head);
  font-weight: 900;
  font-size: clamp(32px, 8.4vw, 68px);
  line-height: 1.06;
  letter-spacing: -0.02em;
  color: var(--ink-blue);
}

.page-about .about-hero__lede {
  margin: 18px 0 0;
  font-size: 16px;
  line-height: 1.78;
  max-width: 34em;
  border-left: 4px solid var(--clay);
  padding-left: 14px;
}

.page-about .about-hero__meta {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: 8px 0;
  margin: 20px 0 0;
  padding: 0;
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--ink-soft);
}

.page-about .about-hero__meta li {
  padding-right: 12px;
  margin-right: 12px;
  border-right: 1px solid var(--paper-2);
}

.page-about .about-hero__meta li:last-child {
  border-right: 0;
  margin-right: 0;
  padding-right: 0;
}

/* ---------- 主体骨架 ---------- */
.page-about .about-shell {
  display: grid;
  gap: 8px;
  margin-top: 12px;
}

/* ---------- 左侧索引 ---------- */
.page-about .about-rail {
  border-top: 3px solid var(--ink-blue);
  padding-top: 12px;
  margin-bottom: 26px;
}

.page-about .about-rail__label {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.2em;
  color: var(--ink-soft);
}

.page-about .about-rail__label--second {
  margin-top: 18px;
}

.page-about .about-rail__years {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 10px 0 0;
  padding: 0;
}

.page-about .about-rail__years a {
  display: block;
  padding: 4px 9px;
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 600;
  color: var(--ink-blue);
  text-decoration: none;
  border: 2px solid var(--ink-blue);
  border-radius: var(--radius);
  background: var(--paper-3);
  transition: background-color 160ms var(--ease), color 160ms var(--ease);
}

.page-about .about-rail__years a:hover,
.page-about .about-rail__years a:focus-visible {
  background: var(--clay);
  border-color: var(--clay);
  color: var(--paper-3);
}

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

.page-about .about-rail__links a {
  display: flex;
  gap: 8px;
  align-items: baseline;
  padding: 7px 0;
  font-size: 14px;
  color: var(--ink);
  text-decoration: none;
  border-bottom: 1px solid var(--paper-2);
}

.page-about .about-rail__links a:hover,
.page-about .about-rail__links a:focus-visible {
  color: var(--clay-deep);
}

.page-about .about-rail__links span {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--clay);
}

/* ---------- 通用区块 ---------- */
.page-about .about-block {
  margin-bottom: 46px;
}

/* ---------- 起步 ---------- */
.page-about .about-origin {
  background: var(--paper-3);
  border: 3px solid var(--ink-blue);
  border-left-width: 8px;
  border-left-color: var(--clay);
  border-radius: var(--radius);
  box-shadow: var(--hard-shadow);
  padding: 22px 18px 24px;
}

/* ---------- 时间线 ---------- */
.page-about .about-timeline {
  background: var(--ink-blue);
  border-radius: var(--radius);
  box-shadow: var(--hard-shadow);
  padding: 26px 18px 8px;
  margin-bottom: 46px;
}

.page-about .tl {
  list-style: none;
  position: relative;
  margin: 22px 0 0;
  padding: 0;
}

.page-about .tl::before {
  content: "";
  position: absolute;
  left: 7px;
  top: 8px;
  bottom: 8px;
  width: 2px;
  background: var(--about-line);
}

.page-about .tl__item {
  position: relative;
  padding-left: 34px;
  padding-bottom: 26px;
}

.page-about .tl__item::before {
  content: "";
  position: absolute;
  left: 0;
  top: 9px;
  width: 16px;
  height: 16px;
  border-radius: 1px;
  background: var(--clay);
  box-shadow: 0 0 0 3px var(--ink-blue);
}

.page-about .tl__item--now::before {
  background: var(--card-yellow);
  box-shadow: 0 0 0 3px var(--ink-blue), 0 0 0 5px var(--card-yellow);
}

.page-about .tl__year {
  margin: 0;
  font-family: var(--font-mono);
  font-weight: 600;
  font-size: 32px;
  line-height: 1;
  letter-spacing: -0.03em;
  color: var(--card-yellow);
}

.page-about .tl__item--now .tl__year {
  color: var(--paper-3);
}

.page-about .tl__title {
  margin: 8px 0 0;
  font-family: var(--font-head);
  font-weight: 900;
  font-size: 18px;
  line-height: 1.4;
  color: var(--paper);
}

.page-about .tl__text {
  margin: 8px 0 0;
  font-size: 15px;
  line-height: 1.72;
  color: var(--about-paper-soft);
  max-width: 40em;
}

/* ---------- 团队卡片 ---------- */
.page-about .roles {
  display: grid;
  gap: 16px;
  margin-top: 22px;
}

.page-about .role-card {
  position: relative;
  background: var(--paper-3);
  border: 3px solid var(--ink-blue);
  border-radius: var(--radius);
  box-shadow: var(--hard-shadow);
  padding: 18px;
  outline-offset: 3px;
}

.page-about .role-card__num {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.16em;
  color: var(--clay);
}

.page-about .role-card__title {
  margin: 6px 0 0;
  font-family: var(--font-head);
  font-weight: 900;
  font-size: 20px;
  color: var(--ink-blue);
}

.page-about .role-card__count {
  margin: 10px 0 0;
  font-family: var(--font-mono);
  font-weight: 600;
  font-size: 40px;
  line-height: 1;
  color: var(--ink-blue);
}

.page-about .role-card__hint {
  display: none;
  margin: 8px 0 0;
  font-size: 12px;
  color: var(--ink-soft);
}

.page-about .role-card__back {
  margin-top: 14px;
  padding-top: 12px;
  border-top: 1px dashed var(--clay);
}

.page-about .role-card__list {
  list-style: none;
  margin: 0;
  padding: 0;
}

.page-about .role-card__list li {
  position: relative;
  padding-left: 16px;
  margin-bottom: 7px;
  font-size: 14px;
  line-height: 1.62;
}

.page-about .role-card__list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 9px;
  width: 8px;
  height: 2px;
  background: var(--clay);
}

.page-about .role-card:focus-visible {
  outline: 3px solid var(--clay-deep);
}

/* ---------- 流程 ---------- */
.page-about .about-split {
  display: grid;
  gap: 24px;
  margin-top: 6px;
}

.page-about .flow {
  list-style: none;
  margin: 20px 0 0;
  padding: 0;
  display: grid;
  gap: 14px;
}

.page-about .flow__step {
  position: relative;
  background: var(--paper-3);
  border: 3px solid var(--ink-blue);
  border-left-width: 10px;
  border-radius: var(--radius);
  box-shadow: var(--hard-shadow);
  padding: 16px 16px 16px 54px;
}

.page-about .flow__step--a {
  border-left-color: var(--clay);
}

.page-about .flow__step--b {
  border-left-color: var(--pitch);
}

.page-about .flow__step--c {
  border-left-color: var(--card-yellow);
}

.page-about .flow__num {
  position: absolute;
  left: 14px;
  top: 16px;
  font-family: var(--font-mono);
  font-weight: 600;
  font-size: 20px;
  line-height: 1;
  color: var(--clay-deep);
}

.page-about .flow__title {
  margin: 0;
  font-family: var(--font-head);
  font-weight: 900;
  font-size: 17px;
  color: var(--ink-blue);
}

.page-about .flow__text {
  margin: 7px 0 0;
  font-size: 15px;
  line-height: 1.72;
}

.page-about .about-fig--side .media {
  border-color: var(--clay-deep);
}

/* ---------- 读者 ---------- */
.page-about .about-readers {
  background: var(--ink-blue);
  border-radius: var(--radius);
  box-shadow: var(--hard-shadow);
  padding: 26px 18px 28px;
  margin-bottom: 46px;
}

.page-about .about-fig--band {
  margin-top: 20px;
}

.page-about .about-fig--band .media {
  border-color: var(--paper-2);
}

.page-about .about-fig--band .media__caption {
  color: var(--about-paper-soft);
}

.page-about .about-stats {
  list-style: none;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 18px 14px;
  margin: 22px 0 0;
  padding: 20px 0 0;
  border-top: 2px solid var(--about-line);
}

.page-about .stat-num {
  margin: 0;
  font-family: var(--font-mono);
  font-weight: 600;
  font-size: clamp(30px, 7vw, 46px);
  line-height: 1;
  letter-spacing: -0.03em;
  color: var(--card-yellow);
}

.page-about .stat-label {
  margin: 8px 0 0;
  font-size: 12px;
  line-height: 1.6;
  color: var(--about-paper-soft);
}

/* ---------- 合作 ---------- */
.page-about .coop {
  display: grid;
  gap: 16px;
  margin-top: 22px;
}

.page-about .coop__card {
  background: var(--paper-3);
  border: 3px solid var(--ink-blue);
  border-top-width: 10px;
  border-radius: var(--radius);
  box-shadow: var(--hard-shadow);
  padding: 18px;
}

.page-about .coop__card--pitch {
  border-top-color: var(--pitch);
}

.page-about .coop__card--clay {
  border-top-color: var(--clay);
}

.page-about .coop__title {
  margin: 0;
  font-family: var(--font-head);
  font-weight: 900;
  font-size: 18px;
  color: var(--ink-blue);
}

.page-about .coop__text {
  margin: 10px 0 0;
  font-size: 15px;
  line-height: 1.74;
}

.page-about .coop__meta {
  margin: 12px 0 0;
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--ink-soft);
}

/* ---------- 行动区 ---------- */
.page-about .about-cta {
  background: var(--paper-2);
  border: 3px solid var(--clay);
  border-radius: var(--radius);
  box-shadow: var(--hard-shadow);
  padding: 24px 18px;
}

.page-about .about-cta__links {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin: 20px 0 0;
  padding: 0;
}

/* ---------- 响应式 ---------- */
@media (min-width: 640px) {
  .page-about .about-origin,
  .page-about .about-timeline,
  .page-about .about-readers,
  .page-about .about-cta {
    padding-inline: 28px;
  }

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

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

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

  .page-about .tl__year {
    font-size: 46px;
  }
}

@media (min-width: 900px) {
  .page-about .about-hero {
    padding-block: 28px 48px;
  }

  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 1.1fr) minmax(0, 0.9fr);
    align-items: end;
    column-gap: 44px;
  }

  .page-about .about-hero__fig {
    transform: translateY(10px);
  }

  .page-about .about-split {
    grid-template-columns: minmax(0, 1.15fr) minmax(0, 0.85fr);
    align-items: start;
    column-gap: 26px;
  }

  .page-about .about-fig--side {
    margin-top: 20px;
  }

  .page-about .flow__step:nth-child(2) {
    margin-left: 32px;
  }

  .page-about .flow__step:nth-child(3) {
    margin-left: 64px;
  }

  .page-about .about-timeline {
    padding-block: 34px 14px;
  }

  .page-about .tl {
    margin-top: 28px;
  }

  .page-about .tl::before {
    left: 10px;
  }

  .page-about .tl__item {
    padding-left: 60px;
    padding-bottom: 32px;
  }

  .page-about .tl__item::before {
    width: 22px;
    height: 22px;
    top: 12px;
    left: 0;
  }

  .page-about .tl__year {
    font-size: 72px;
  }

  .page-about .tl__title {
    font-size: 20px;
    margin-top: 10px;
  }

  .page-about .tl__text {
    font-size: 16px;
  }
}

@media (hover: hover) and (min-width: 900px) {
  .page-about .role-card {
    padding: 0;
    perspective: 1400px;
  }

  .page-about .role-card__inner {
    position: relative;
    height: 250px;
    transform-style: preserve-3d;
    transition: transform 520ms var(--ease);
  }

  .page-about .role-card:hover .role-card__inner,
  .page-about .role-card:focus .role-card__inner,
  .page-about .role-card:focus-within .role-card__inner {
    transform: rotateY(180deg);
  }

  .page-about .role-card__face {
    position: absolute;
    inset: 0;
    display: flex;
    flex-direction: column;
    padding: 18px;
    backface-visibility: hidden;
    -webkit-backface-visibility: hidden;
  }

  .page-about .role-card__back {
    margin: 0;
    padding: 18px;
    border-top: 0;
    transform: rotateY(180deg);
    justify-content: center;
  }

  .page-about .role-card__hint {
    display: block;
    margin-top: auto;
  }
}

@media (min-width: 1000px) {
  .page-about .about-shell {
    grid-template-columns: 168px minmax(0, 1fr);
    column-gap: 48px;
    align-items: start;
  }

  .page-about .about-rail {
    position: sticky;
    top: calc(var(--bar-h) + 20px);
    max-height: calc(100vh - var(--bar-h) - 48px);
    overflow-y: auto;
    margin-bottom: 0;
    padding-bottom: 12px;
  }

  .page-about .about-rail__years {
    flex-direction: column;
    align-items: stretch;
    gap: 6px;
  }

  .page-about .about-rail__years a {
    text-align: center;
    padding: 5px 4px;
    font-size: 14px;
  }

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

  .page-about .roles {
    grid-template-columns: repeat(12, minmax(0, 1fr));
    gap: 18px 20px;
  }

  .page-about .role-card:nth-child(1) {
    grid-column: 1 / span 5;
  }

  .page-about .role-card:nth-child(2) {
    grid-column: 7 / span 6;
    margin-top: 26px;
  }

  .page-about .role-card:nth-child(3) {
    grid-column: 2 / span 4;
  }

  .page-about .role-card:nth-child(4) {
    grid-column: 7 / span 6;
    margin-top: 22px;
  }

  .page-about .coop {
    gap: 22px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .role-card__inner {
    transition: none;
  }

  .page-about .about-rail__years a {
    transition: none;
  }
}
<<<END>>>