.page-about {
  --p-shift: 0px;
  background: var(--paper);
  color: var(--text);
  font-family: var(--font-body);
}

/* ============ 首屏 ============ */
.page-about .about-hero {
  position: relative;
  background: var(--ink);
  color: var(--paper);
  padding-block: clamp(20px, 3vw, 32px) clamp(40px, 6vw, 76px);
  overflow: hidden;
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--line-copper) 18%, var(--line-copper) 82%, transparent);
}

.page-about .about-hero__inner {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(26px, 4vw, 46px);
  align-items: center;
}

@media (min-width: 900px) {
  .page-about .about-hero__inner {
    grid-template-columns: minmax(0, 1.15fr) minmax(0, 0.85fr);
  }
}

/* 面包屑（深底） */
.page-about .about-crumb {
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: 0.04em;
  color: rgba(244, 241, 234, 0.55);
}

.page-about .about-crumb ul {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0 8px;
  margin: 0 0 clamp(16px, 2.4vw, 26px);
  padding: 0;
  list-style: none;
}

.page-about .about-crumb li {
  display: inline-flex;
  align-items: center;
}

.page-about .about-crumb li + li::before {
  content: "/";
  margin-right: 8px;
  color: var(--copper);
}

.page-about .about-crumb a {
  color: rgba(244, 241, 234, 0.55);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color 0.18s ease, border-color 0.18s ease;
}

.page-about .about-crumb a:hover,
.page-about .about-crumb a:focus-visible {
  color: var(--paper);
  border-bottom-color: var(--copper);
}

.page-about .about-crumb li[aria-current="page"] {
  color: var(--copper);
}

.page-about .about-hero .eyebrow {
  display: inline-block;
  margin: 0 0 12px;
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: 0.12em;
  color: var(--copper);
}

.page-about .about-hero h1 {
  margin: 0 0 clamp(14px, 2vw, 20px);
  font-family: var(--font-head);
  font-size: clamp(32px, 5.2vw, 58px);
  font-weight: 800;
  line-height: 1.1;
  letter-spacing: -0.02em;
  color: var(--paper);
}

.page-about .about-hero__lead {
  margin: 0 0 clamp(20px, 3vw, 30px);
  max-width: 34em;
  font-family: var(--font-serif);
  font-size: clamp(15.5px, 1.5vw, 18px);
  line-height: 1.8;
  color: rgba(244, 241, 234, 0.82);
}

.page-about .about-hero__acts {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

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

.page-about .about-hero__fig .fig__frame {
  aspect-ratio: auto;
  background: var(--ink-2);
  border: 1px solid var(--line-copper);
  border-radius: var(--r);
  overflow: hidden;
}

.page-about .fig__frame img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
}

/* ============ 左窄右宽骨架 ============ */
.page-about .about-body {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(30px, 4vw, 48px);
  padding-block: clamp(36px, 6vw, 76px);
  align-items: start;
}

@media (min-width: 960px) {
  .page-about .about-body {
    grid-template-columns: 236px minmax(0, 1fr);
    gap: clamp(40px, 5vw, 72px);
  }
}

/* ============ 左侧章节索引 ============ */
.page-about .about-rail__sticky {
  position: static;
}

@media (min-width: 960px) {
  .page-about .about-rail__sticky {
    position: sticky;
    top: 84px;
  }
}

.page-about .about-rail__label {
  margin: 0 0 12px;
  font-size: 11px;
  letter-spacing: 0.14em;
  color: var(--graphite);
}

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

@media (min-width: 560px) and (max-width: 959px) {
  .page-about .about-rail__list {
    grid-template-columns: 1fr 1fr;
    column-gap: 16px;
  }
}

.page-about .about-rail__list a {
  display: flex;
  align-items: baseline;
  gap: 10px;
  padding: 9px 10px;
  border-left: 1px solid var(--line-dark);
  font-size: 14px;
  line-height: 1.4;
  color: var(--graphite);
  text-decoration: none;
  transition: color 0.18s ease, border-color 0.18s ease, background-color 0.18s ease;
}

.page-about .about-rail__list a .mono {
  font-size: 11px;
  letter-spacing: 0.06em;
  color: var(--copper);
}

.page-about .about-rail__list a:hover,
.page-about .about-rail__list a:focus-visible {
  color: var(--ink);
  border-left-color: var(--signal);
  background: var(--stone);
}

.page-about .about-rail__badge {
  margin-top: 20px;
  padding: 14px 16px 16px;
  display: grid;
  gap: 4px;
  background: var(--ink);
  border: 1px solid var(--line-copper);
  border-radius: var(--r);
  color: var(--paper);
}

.page-about .about-rail__badge .mono {
  font-size: 11px;
  letter-spacing: 0.1em;
  color: var(--copper);
}

.page-about .about-rail__badge strong {
  font-family: var(--font-head);
  font-size: 22px;
  letter-spacing: -0.01em;
}

.page-about .about-rail__badge .about-rail__date {
  color: rgba(244, 241, 234, 0.6);
}

/* ============ 右侧堆叠面板 ============ */
.page-about .about-main {
  display: grid;
  gap: clamp(30px, 4vw, 50px);
  min-width: 0;
}

.page-about .about-sec {
  min-width: 0;
  padding: clamp(20px, 3vw, 34px);
  background: var(--paper);
  border: 1px solid var(--line-dark-soft);
  border-radius: var(--r);
  box-shadow: var(--shadow-panel);
  scroll-margin-top: 96px;
}

.page-about .about-sec__head {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 14px;
  align-items: baseline;
  padding-bottom: 14px;
  margin-bottom: 18px;
  border-bottom: 1px solid var(--line-copper);
}

.page-about .about-sec__head .section-num {
  font-family: var(--mono);
  font-size: clamp(19px, 2.3vw, 27px);
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--copper);
}

.page-about .about-sec__head h2 {
  margin: 0;
  font-family: var(--font-head);
  font-size: clamp(20px, 2.5vw, 29px);
  line-height: 1.22;
  letter-spacing: -0.01em;
  color: var(--ink);
}

.page-about .about-sec__lead {
  margin: 0 0 20px;
  max-width: 40em;
  font-size: 15.5px;
  line-height: 1.75;
  color: var(--graphite);
}

.page-about .prose p {
  margin: 0 0 14px;
  max-width: 40em;
  font-size: 16.5px;
  line-height: 1.78;
}

.page-about .prose p:last-child {
  margin-bottom: 0;
}

.page-about .about-sec a {
  color: var(--signal);
  text-decoration: underline;
  text-underline-offset: 3px;
  text-decoration-thickness: 1px;
}

.page-about .about-sec a:hover,
.page-about .about-sec a:focus-visible {
  color: var(--ink);
}

/* ---- 02 四组栏目 ---- */
.page-about .about-groups {
  display: grid;
  grid-template-columns: 1fr;
  gap: 20px 24px;
}

@media (min-width: 700px) {
  .page-about .about-groups {
    grid-template-columns: 1fr 1fr;
  }
}

.page-about .about-group {
  padding: 2px 0 2px 16px;
  border-left: 2px solid var(--copper);
}

.page-about .about-group__tag {
  display: block;
  margin: 0 0 6px;
  font-size: 11px;
  letter-spacing: 0.1em;
  color: var(--graphite);
}

.page-about .about-group h3 {
  margin: 0 0 8px;
  font-family: var(--font-head);
  font-size: 19px;
  letter-spacing: -0.01em;
  color: var(--ink);
}

.page-about .about-group p {
  margin: 0 0 8px;
  font-size: 15px;
  line-height: 1.72;
}

.page-about .about-group .about-group__fit {
  margin: 0;
  font-size: 13.5px;
  line-height: 1.6;
  color: var(--moss);
}

/* ---- 03 人群档案卡 ---- */
.page-about .about-people__fig {
  margin: 20px 0 26px;
}

.page-about .about-people__fig .fig__frame {
  aspect-ratio: auto;
  background: var(--stone);
  border: 1px solid var(--line-dark-soft);
  border-radius: var(--r);
  overflow: hidden;
}

.page-about .about-people {
  display: grid;
  grid-template-columns: 1fr;
  gap: 18px;
}

@media (min-width: 760px) {
  .page-about .about-people {
    grid-template-columns: 1fr 1fr;
    gap: 22px;
    padding-bottom: 28px;
  }

  .page-about .about-person:nth-child(2),
  .page-about .about-person:nth-child(4) {
    --p-shift: 24px;
  }
}

.page-about .about-person {
  position: relative;
  padding: 26px 18px 18px;
  background: var(--paper);
  border: 1px solid var(--line-dark);
  border-radius: var(--r);
  transform: translateY(var(--p-shift));
  transition: transform 0.2s ease, box-shadow 0.2s ease, border-color 0.2s ease;
}

.page-about .about-person:hover {
  transform: translateY(calc(var(--p-shift) - 4px));
  border-color: var(--line-copper);
  box-shadow: var(--shadow-panel);
}

.page-about .about-person__badge {
  position: absolute;
  top: -1px;
  left: -1px;
  padding: 2px 9px 3px;
  background: var(--clay);
  color: var(--paper);
  font-family: var(--mono);
  font-size: 10.5px;
  letter-spacing: 0.1em;
  border-radius: var(--r) 0 4px 0;
}

.page-about .about-person h3 {
  margin: 0 0 8px;
  font-family: var(--font-head);
  font-size: 18px;
  line-height: 1.3;
  letter-spacing: -0.01em;
  color: var(--ink);
}

.page-about .about-person__desc {
  margin: 0 0 12px;
  font-size: 14.5px;
  line-height: 1.7;
  color: var(--text);
}

.page-about .about-person__route {
  margin: 0;
  padding-top: 10px;
  border-top: 1px solid var(--line-dark-soft);
  font-size: 13px;
  line-height: 1.6;
  color: var(--ink-2);
}

.page-about .about-person__route .mono {
  margin-right: 8px;
  font-size: 10.5px;
  letter-spacing: 0.1em;
  color: var(--clay);
}

/* ---- 04 版本时间线 ---- */
.page-about .about-version__fig {
  margin: 20px 0 28px;
}

.page-about .about-version__fig .fig__frame {
  aspect-ratio: auto;
  background: var(--stone);
  border: 1px solid var(--line-dark-soft);
  border-radius: var(--r);
  overflow: hidden;
}

.page-about .about-timeline {
  position: relative;
  margin: 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 30px;
}

.page-about .about-timeline::before {
  content: "";
  position: absolute;
  left: 15px;
  top: 8px;
  bottom: 8px;
  width: 1px;
  background: linear-gradient(180deg, var(--copper), var(--line-copper) 72%, transparent);
}

.page-about .about-tl__item {
  position: relative;
  padding-left: 48px;
}

.page-about .about-tl__dot {
  position: absolute;
  top: 0;
  left: 4px;
  width: 23px;
  height: 23px;
  display: grid;
  place-items: center;
  border-radius: 50%;
  border: 1px solid var(--copper);
  background: var(--paper);
  font-size: 9.5px;
  letter-spacing: 0;
  color: var(--copper);
}

.page-about .about-tl__item--now .about-tl__dot {
  border-color: var(--moss);
  background: var(--stone);
  color: var(--moss);
}

.page-about .about-tl__meta {
  margin: 0 0 5px;
  font-size: 11px;
  letter-spacing: 0.12em;
  color: var(--graphite);
}

.page-about .about-tl__item--now .about-tl__meta {
  color: var(--moss);
}

.page-about .about-tl__item h3 {
  margin: 0 0 6px;
  font-family: var(--font-head);
  font-size: 18px;
  line-height: 1.3;
  color: var(--ink);
}

.page-about .about-tl__item p {
  margin: 0;
  max-width: 40em;
  font-size: 15px;
  line-height: 1.72;
}

/* ---- 05 内容来源 ---- */
.page-about .about-src {
  display: grid;
  grid-template-columns: 1fr;
  gap: 22px;
}

@media (min-width: 760px) {
  .page-about .about-src {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 24px;
  }
}

.page-about .about-src__item {
  padding-top: 14px;
  border-top: 1px solid var(--line-dark);
}

.page-about .about-src__tag {
  display: block;
  margin-bottom: 6px;
  font-size: 11px;
  letter-spacing: 0.1em;
  color: var(--copper);
}

.page-about .about-src__item h3 {
  margin: 0 0 8px;
  font-family: var(--font-head);
  font-size: 17px;
  line-height: 1.35;
  color: var(--ink);
}

.page-about .about-src__item p {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.72;
  color: var(--text);
}

/* ---- 06 维护团队 ---- */
.page-about .about-team {
  display: grid;
  grid-template-columns: 1fr;
  gap: 14px;
  margin-top: 18px;
}

@media (min-width: 720px) {
  .page-about .about-team {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 16px;
  }
}

.page-about .about-team__item {
  padding: 16px 16px 18px;
  background: var(--stone);
  border: 1px solid var(--line-dark);
  border-radius: var(--r);
}

.page-about .about-team__num {
  display: block;
  font-size: clamp(26px, 3vw, 34px);
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--copper);
}

.page-about .about-team__item h3 {
  margin: 6px 0 8px;
  font-family: var(--font-head);
  font-size: 15px;
  letter-spacing: 0.02em;
  color: var(--ink);
}

.page-about .about-team__item p {
  margin: 0;
  font-size: 14px;
  line-height: 1.7;
  color: var(--text);
}

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

/* ---- 07 长期参考 ---- */
.page-about .about-keep {
  display: grid;
  gap: 0;
}

.page-about .about-keep__row {
  display: grid;
  grid-template-columns: 1fr;
  gap: 6px;
  padding: 16px 0;
  border-bottom: 1px solid var(--line-dark-soft);
}

@media (min-width: 720px) {
  .page-about .about-keep__row {
    grid-template-columns: 148px minmax(0, 1fr);
    gap: 20px;
    align-items: baseline;
  }
}

.page-about .about-keep__row:first-child {
  border-top: 1px solid var(--line-dark-soft);
}

.page-about .about-keep__key {
  font-size: 11.5px;
  letter-spacing: 0.08em;
  color: var(--copper);
}

.page-about .about-keep__row p {
  margin: 0;
  max-width: 40em;
  font-size: 15px;
  line-height: 1.75;
}

.page-about .about-cta {
  margin-top: 24px;
  padding-top: 20px;
  border-top: 1px solid var(--line-copper);
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}

.page-about .about-cta p {
  margin: 0;
  max-width: 34em;
  font-size: 15px;
  line-height: 1.72;
  color: var(--ink-2);
}

.page-about .about-cta .btn {
  flex: 0 0 auto;
}

/* ---- 动效 ---- */
.page-about .reveal {
  opacity: 1;
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-person,
  .page-about .about-person:hover {
    transform: none;
    transition: none;
  }

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