.page-about {
  --about-inline: clamp(16px, 5vw, 40px);
  --about-rail-w: 196px;
  --about-soft: rgba(48, 74, 122, .06);
  background: var(--sr-milk);
  color: var(--sr-ink);
  font-family: var(--sr-font-body);
  font-size: 16px;
  line-height: 1.85;
  overflow-x: clip;
}

.page-about h1,
.page-about h2,
.page-about h3 {
  margin: 0;
  font-family: var(--sr-font-head);
  line-height: 1.28;
}

.page-about p {
  margin: 0;
}

.page-about em {
  font-style: normal;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  display: grid;
  gap: 28px;
  max-width: var(--sr-max);
  margin: 0 auto;
  padding: 20px var(--about-inline) 44px;
  position: relative;
}

.page-about .about-hero__aside {
  position: relative;
  isolation: isolate;
  display: flex;
  flex-direction: column;
  justify-content: flex-end;
  gap: 6px;
  min-height: 268px;
  padding: 24px 22px;
  border: 1px solid var(--sr-line);
  border-radius: var(--sr-radius);
  overflow: hidden;
  background: linear-gradient(165deg, var(--sr-indigo), var(--sr-night) 58%, var(--sr-dusk));
}

.page-about .about-hero__img {
  position: absolute;
  inset: 0;
  z-index: -1;
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: .42;
}

.page-about .about-hero__caption {
  font-family: var(--sr-font-mono);
  font-size: 12px;
  letter-spacing: .1em;
  color: var(--sr-amber-soft);
}

.page-about .about-hero__motto {
  font-family: var(--sr-font-display);
  font-weight: 700;
  font-size: 26px;
  line-height: 1.4;
  color: var(--sr-milk);
}

.page-about .about-hero__main {
  position: relative;
  padding-top: 4px;
}

.page-about .about-hero__main::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 56px;
  height: 3px;
  background: var(--sr-amber);
  border-radius: 2px;
}

.page-about .about-hero__title {
  margin-top: 18px;
  font-family: var(--sr-font-display);
  font-weight: 700;
  font-size: clamp(32px, 6vw, 58px);
  line-height: 1.16;
  letter-spacing: -.01em;
  color: var(--sr-night);
}

.page-about .about-hero__lede {
  margin-top: 20px;
  max-width: 46em;
  font-size: 16px;
  color: rgba(20, 27, 45, .82);
}

.page-about .about-stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 18px 12px;
  margin: 30px 0 0;
  padding: 22px 0 0;
  list-style: none;
  border-top: 1px solid var(--sr-line);
}

.page-about .about-stats__item {
  display: flex;
  flex-direction: column;
  gap: 2px;
  min-width: 0;
}

.page-about .about-stats__num {
  font-family: var(--sr-font-mono);
  font-size: 30px;
  font-weight: 600;
  line-height: 1.1;
  color: var(--sr-indigo);
}

.page-about .about-stats__num em {
  font-size: 14px;
  font-weight: 500;
  margin-left: 3px;
  color: var(--sr-slate);
}

.page-about .about-stats__label {
  font-size: 13px;
  line-height: 1.6;
  color: rgba(20, 27, 45, .6);
}

/* ---------- 手账主体 ---------- */
.page-about .about-book {
  max-width: var(--sr-max);
  margin: 0 auto;
  padding: 0 var(--about-inline) 76px;
}

.page-about .about-rail {
  padding-bottom: 14px;
  margin-bottom: 30px;
  border-bottom: 1px solid var(--sr-line);
}

.page-about .about-rail__label {
  font-family: var(--sr-font-mono);
  font-size: 11px;
  letter-spacing: .18em;
  color: var(--sr-slate);
  margin-bottom: 10px;
}

.page-about .about-toc {
  display: flex;
  gap: 8px;
  overflow-x: auto;
  padding-bottom: 4px;
  scrollbar-width: thin;
}

.page-about .about-toc__link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  flex: 0 0 auto;
  padding: 6px 11px;
  border: 1px solid var(--sr-line);
  border-radius: 999px;
  font-family: var(--sr-font-head);
  font-size: 13px;
  color: rgba(20, 27, 45, .78);
  text-decoration: none;
  white-space: nowrap;
  transition: border-color .16s var(--sr-ease), color .16s var(--sr-ease), background-color .16s var(--sr-ease);
}

.page-about .about-toc__no {
  font-family: var(--sr-font-mono);
  font-size: 11px;
  color: var(--sr-amber);
}

.page-about .about-toc__link:hover,
.page-about .about-toc__link:focus-visible {
  border-color: var(--sr-amber);
  color: var(--sr-night);
}

.page-about .about-toc__link[data-active="true"] {
  background: rgba(227, 168, 87, .14);
  border-color: var(--sr-amber);
  color: var(--sr-night);
}

.page-about .about-body > .about-chapter + .about-chapter {
  margin-top: 64px;
}

.page-about .about-chapter__no {
  font-family: var(--sr-font-mono);
  font-size: 12px;
  letter-spacing: .16em;
  color: var(--sr-amber);
  margin-bottom: 8px;
}

.page-about .about-chapter .sr-h2 {
  font-family: var(--sr-font-display);
  font-weight: 700;
  font-size: clamp(24px, 4vw, 36px);
  line-height: 1.3;
  color: var(--sr-night);
  max-width: 22em;
}

.page-about .about-prose {
  margin-top: 18px;
  display: grid;
  gap: 14px;
  max-width: 40em;
  color: rgba(20, 27, 45, .84);
}

.page-about .about-prose--tight {
  display: block;
  margin-top: 16px;
}

.page-about .about-points {
  list-style: none;
  margin: 26px 0 0;
  padding: 0;
  display: grid;
  gap: 12px;
  border-left: 2px solid var(--sr-line-soft);
  padding-left: 18px;
}

.page-about .about-points__item {
  display: flex;
  align-items: baseline;
  gap: 10px;
  font-size: 15px;
  color: rgba(20, 27, 45, .78);
}

.page-about .about-points__key {
  flex: 0 0 auto;
  font-family: var(--sr-font-mono);
  font-size: 18px;
  font-weight: 600;
  color: var(--sr-indigo);
}

/* ---------- 团队 ---------- */
.page-about .about-team {
  display: grid;
  gap: 18px;
  margin-top: 28px;
}

.page-about .about-team__card {
  padding: 22px 20px;
  background: var(--sr-paper);
  border: 1px solid var(--sr-line);
  border-radius: var(--sr-radius);
  box-shadow: var(--sr-shadow);
  transition: transform .16s var(--sr-ease), box-shadow .16s var(--sr-ease);
}

.page-about .about-team__card:hover {
  transform: translateY(-2px);
  box-shadow: var(--sr-shadow-lift);
}

.page-about .about-team__name {
  font-family: var(--sr-font-head);
  font-weight: 700;
  font-size: 19px;
  color: var(--sr-night);
}

.page-about .about-team__meta {
  margin-top: 4px;
  font-family: var(--sr-font-mono);
  font-size: 12px;
  letter-spacing: .06em;
  color: var(--sr-slate);
}

.page-about .about-team__body {
  margin-top: 12px;
  font-size: 15px;
  line-height: 1.8;
  color: rgba(20, 27, 45, .8);
}

.page-about .about-team__more {
  margin-top: 14px;
  border-top: 1px dashed var(--sr-line);
  padding-top: 10px;
}

.page-about .about-team__more .sr-expand__q {
  font-family: var(--sr-font-head);
  font-size: 14px;
  font-weight: 700;
  color: var(--sr-indigo);
  cursor: pointer;
}

.page-about .about-team__more .sr-expand__a {
  margin-top: 8px;
  font-size: 14px;
  line-height: 1.8;
  color: rgba(20, 27, 45, .74);
}

/* ---------- 图片 ---------- */
.page-about .about-figure {
  margin: 30px 0 0;
  border: 1px solid var(--sr-line);
  border-radius: var(--sr-radius);
  overflow: hidden;
  background: var(--about-soft);
}

.page-about .about-figure .sr-figure__img {
  display: block;
  width: 100%;
  height: auto;
  max-width: 100%;
  aspect-ratio: 14 / 9;
  object-fit: cover;
}

.page-about .about-figure--sync .sr-figure__img {
  aspect-ratio: 16 / 10;
}

.page-about .about-figure .sr-figure__cap {
  padding: 12px 16px;
  font-size: 13px;
  line-height: 1.7;
  color: rgba(20, 27, 45, .62);
  border-top: 1px solid var(--sr-line-soft);
  background: var(--sr-paper);
}

/* ---------- 三条方式 ---------- */
.page-about .about-rules {
  list-style: none;
  margin: 26px 0 0;
  padding: 0;
  counter-reset: rule;
}

.page-about .about-rules__item {
  padding: 20px 0 20px 46px;
  border-top: 1px solid var(--sr-line);
  position: relative;
  counter-increment: rule;
}

.page-about .about-rules__item::before {
  content: "0" counter(rule);
  position: absolute;
  left: 0;
  top: 22px;
  font-family: var(--sr-font-mono);
  font-size: 13px;
  color: var(--sr-amber);
}

.page-about .about-rules__name {
  font-family: var(--sr-font-head);
  font-weight: 700;
  font-size: 17px;
  color: var(--sr-night);
}

.page-about .about-rules__item p {
  margin-top: 8px;
  font-size: 15px;
  line-height: 1.8;
  color: rgba(20, 27, 45, .78);
  max-width: 38em;
}

/* ---------- 版本刻度 ---------- */
.page-about .about-stages-block {
  margin-top: 26px;
  padding: 26px 20px 28px;
  border-radius: var(--sr-radius);
  background:
    radial-gradient(120% 90% at 100% 0%, rgba(227, 168, 87, .22), transparent 58%),
    linear-gradient(155deg, var(--sr-indigo), var(--sr-night) 72%);
  color: var(--sr-milk);
}

.page-about .about-stages {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 26px;
}

.page-about .about-stages__item {
  position: relative;
  padding-top: 24px;
  border-top: 1px solid var(--sr-line-light);
}

.page-about .about-stages__item::before {
  content: "";
  position: absolute;
  top: -5px;
  left: 0;
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--sr-slate);
  box-shadow: 0 0 0 4px var(--sr-night);
}

.page-about .about-stages__item[data-active="true"]::before {
  background: var(--sr-flare);
  box-shadow: 0 0 0 4px var(--sr-night), 0 0 0 7px rgba(227, 168, 87, .3);
}

.page-about .about-stages__no {
  display: block;
  font-family: var(--sr-font-mono);
  font-size: 12px;
  letter-spacing: .16em;
  color: var(--sr-amber);
}

.page-about .about-stages__name {
  margin-top: 6px;
  display: flex;
  align-items: center;
  gap: 8px;
  font-family: var(--sr-font-head);
  font-weight: 700;
  font-size: 18px;
  color: var(--sr-milk);
}

.page-about .about-stages__now {
  font-family: var(--sr-font-mono);
  font-size: 11px;
  font-weight: 500;
  letter-spacing: .08em;
  padding: 2px 7px;
  border-radius: 999px;
  color: var(--sr-night);
  background: var(--sr-amber);
}

.page-about .about-stages__text {
  margin-top: 8px;
  font-size: 14px;
  line-height: 1.8;
  color: rgba(247, 242, 230, .78);
}

/* ---------- 规模 ---------- */
.page-about .about-figures {
  display: grid;
  gap: 24px;
  margin-top: 28px;
  padding: 24px 0;
  border-top: 1px solid var(--sr-line);
  border-bottom: 1px solid var(--sr-line);
}

.page-about .about-figures__item {
  display: flex;
  flex-direction: column;
  gap: 4px;
  min-width: 0;
}

.page-about .about-figures__num {
  font-family: var(--sr-font-mono);
  font-size: clamp(38px, 7vw, 58px);
  font-weight: 600;
  line-height: 1.05;
  color: var(--sr-night);
  letter-spacing: -.02em;
}

.page-about .about-figures__num em {
  font-size: .38em;
  font-weight: 500;
  margin-left: 4px;
  color: var(--sr-amber);
  letter-spacing: 0;
}

.page-about .about-figures__cap {
  font-size: 13px;
  line-height: 1.7;
  color: rgba(20, 27, 45, .6);
  max-width: 16em;
}

.page-about .about-notes {
  display: grid;
  gap: 22px;
  margin-top: 28px;
}

.page-about .about-notes__col {
  padding-left: 16px;
  border-left: 2px solid var(--sr-amber-soft);
}

.page-about .about-notes__name {
  font-family: var(--sr-font-head);
  font-weight: 700;
  font-size: 16px;
  color: var(--sr-indigo);
}

.page-about .about-notes__col p {
  margin-top: 8px;
  font-size: 15px;
  line-height: 1.8;
  color: rgba(20, 27, 45, .78);
  max-width: 34em;
}

/* ---------- 结尾 ---------- */
.page-about .about-cta {
  margin-top: 36px;
  padding: 24px 20px;
  background: var(--sr-paper);
  border: 1px solid var(--sr-line);
  border-left: 3px solid var(--sr-amber);
  border-radius: var(--sr-radius);
}

.page-about .about-cta__text {
  font-size: 15px;
  line-height: 1.8;
  color: rgba(20, 27, 45, .8);
  max-width: 34em;
}

.page-about .about-cta__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 16px;
}

.page-about .about-cta__actions .sr-btn {
  text-decoration: none;
}

/* ---------- 平板 ---------- */
@media (min-width: 720px) {
  .page-about .about-stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 18px 16px;
  }

  .page-about .about-team {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 20px;
  }

  .page-about .about-figures {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 20px;
  }

  .page-about .about-notes {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 24px;
  }

  .page-about .about-stages {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 22px;
  }

  .page-about .about-cta {
    display: flex;
    align-items: flex-end;
    justify-content: space-between;
    gap: 24px;
    padding: 26px 24px;
  }

  .page-about .about-cta__actions {
    margin-top: 0;
    flex: 0 0 auto;
  }
}

/* ---------- 桌面非对称分栏 ---------- */
@media (min-width: 900px) {
  .page-about .about-hero {
    grid-template-columns: minmax(0, 5fr) minmax(0, 7fr);
    gap: 48px;
    align-items: start;
    padding-top: 38px;
    padding-bottom: 56px;
  }

  .page-about .about-hero__aside {
    min-height: 460px;
    padding: 28px 26px;
  }

  .page-about .about-hero__motto {
    font-size: 30px;
  }

  .page-about .about-hero__main {
    padding-top: 12px;
  }

  .page-about .about-team {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 22px;
    align-items: start;
  }

  .page-about .about-team__card:nth-child(2) {
    margin-top: 26px;
  }

  .page-about .about-team__card:nth-child(3) {
    margin-top: 52px;
  }

  .page-about .about-stages-block {
    padding: 34px 30px 36px;
  }

  .page-about .about-body > .about-chapter + .about-chapter {
    margin-top: 96px;
  }
}

@media (min-width: 1024px) {
  .page-about .about-book {
    display: grid;
    grid-template-columns: var(--about-rail-w) minmax(0, 1fr);
    gap: 56px;
    align-items: start;
    padding-bottom: 104px;
  }

  .page-about .about-rail {
    position: sticky;
    top: 96px;
    margin-bottom: 0;
    padding: 0 0 0 16px;
    border-bottom: 0;
    border-left: 1px solid var(--sr-line);
  }

  .page-about .about-toc {
    flex-direction: column;
    gap: 2px;
    overflow: visible;
    padding-bottom: 0;
  }

  .page-about .about-toc__link {
    border: 0;
    border-radius: 0;
    padding: 8px 0 8px 12px;
    font-size: 14px;
    background: transparent;
    position: relative;
  }

  .page-about .about-toc__link::before {
    content: "";
    position: absolute;
    left: -17px;
    top: 12px;
    width: 2px;
    height: 0;
    background: var(--sr-amber);
    transition: height .2s var(--sr-ease);
  }

  .page-about .about-toc__link[data-active="true"] {
    background: transparent;
    color: var(--sr-night);
    font-weight: 700;
  }

  .page-about .about-toc__link[data-active="true"]::before {
    height: 20px;
  }

  .page-about .about-chapter .sr-h2 {
    max-width: 18em;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-team__card,
  .page-about .about-toc__link,
  .page-about .about-toc__link::before {
    transition: none;
  }

  .page-about .about-team__card:hover {
    transform: none;
  }
}
<<<END>>>