.page-about {
  --about-rail: 264px;
  --about-shadow: 6px 6px 0 var(--ink);
}

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

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  overflow: hidden;
  background: var(--paper-2);
  border-bottom: 3px solid var(--ink);
  padding: 20px 0 28px;
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(var(--line-soft) 1px, transparent 1px),
    linear-gradient(90deg, var(--line-soft) 1px, transparent 1px);
  background-size: 44px 44px;
  pointer-events: none;
}

.page-about .about-hero__inner {
  position: relative;
  z-index: 1;
}

.page-about .about-hero__top {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px 16px;
  margin: 12px 0 16px;
}

.page-about .about-hero__year {
  display: inline-flex;
  align-items: baseline;
  gap: 6px;
  background: var(--gold);
  color: var(--ink);
  border: 2px solid var(--ink);
  box-shadow: var(--shadow-sm);
  font-family: var(--font-mono);
  font-weight: 900;
  font-size: clamp(22px, 6vw, 34px);
  line-height: 1;
  padding: 6px 12px;
}

.page-about .about-hero__year em {
  font-style: normal;
  font-family: var(--font-sans);
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.14em;
}

.page-about .about-hero__kicker {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.12em;
  color: var(--green-deep);
}

.page-about .about-hero__title {
  margin: 0 0 14px;
  font-family: var(--font-serif);
  font-weight: 700;
  font-size: clamp(27px, 6.4vw, 52px);
  line-height: 1.22;
  letter-spacing: -0.01em;
  max-width: 20ch;
}

.page-about .about-hero__lead {
  margin: 0 0 18px;
  max-width: 62ch;
  font-size: 16px;
  line-height: 1.85;
  color: var(--ink-70);
}

.page-about .about-hero__nav {
  margin-top: 4px;
}

.page-about .about-toc {
  display: flex;
  gap: 8px;
  list-style: none;
  margin: 0;
  padding: 2px 2px 8px;
  overflow-x: auto;
  scrollbar-width: thin;
}

.page-about .about-toc li {
  flex: 0 0 auto;
}

.page-about .about-toc__link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  min-height: 44px;
  padding: 8px 12px;
  border: 2px solid var(--ink);
  background: var(--paper);
  color: var(--ink);
  text-decoration: none;
  font-size: 13px;
  font-weight: 600;
  transition: box-shadow 0.14s ease, transform 0.14s ease, background-color 0.14s ease;
}

.page-about .about-toc__link b {
  font-family: var(--font-mono);
  font-weight: 900;
  color: var(--gold-deep);
}

.page-about .about-toc__link:hover,
.page-about .about-toc__link:focus-visible {
  background: var(--gold);
  transform: translate(-2px, -2px);
  box-shadow: var(--shadow-sm);
}

/* ---------- 主体骨架 ---------- */
.page-about .about-body {
  padding: 32px 0 48px;
}

.page-about .layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 28px;
  align-items: start;
}

/* ---------- 章节索引 ---------- */
.page-about .about-rail {
  border: 2px solid var(--ink);
  background: var(--paper-2);
  padding: 12px;
  box-shadow: var(--shadow-sm);
}

.page-about .about-rail__head {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 8px;
  border-bottom: 2px solid var(--ink);
  padding-bottom: 8px;
  margin-bottom: 10px;
}

.page-about .about-rail__title {
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.08em;
}

.page-about .about-rail__count {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--green-deep);
}

.page-about .about-rail__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 2px 6px;
}

.page-about .about-rail__link {
  display: flex;
  align-items: baseline;
  gap: 7px;
  padding: 9px 6px;
  min-height: 44px;
  color: var(--ink);
  text-decoration: none;
  font-size: 13px;
  line-height: 1.4;
  border-left: 3px solid transparent;
  transition: background-color 0.12s ease, border-color 0.12s ease;
}

.page-about .about-rail__link:hover,
.page-about .about-rail__link:focus-visible {
  background: var(--paper);
  border-left-color: var(--green);
}

.page-about .about-rail__link[data-active] {
  background: var(--paper);
  border-left-color: var(--gold);
  font-weight: 700;
}

.page-about .about-rail__index {
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: 11px;
  color: var(--gold-deep);
}

.page-about .about-rail__note {
  margin: 12px 0 0;
  padding-top: 10px;
  border-top: 1px solid var(--line);
  font-size: 12px;
  line-height: 1.7;
  color: var(--ink-70);
}

.page-about .about-rail__note a {
  color: var(--green-deep);
  text-decoration: underline;
  text-underline-offset: 3px;
}

/* ---------- 章节 ---------- */
.page-about .about-chapter {
  padding-top: 20px;
  border-top: 2px solid var(--ink);
  margin-bottom: 40px;
  scroll-margin-top: 16px;
}

.page-about .about-chapter__title {
  display: flex;
  gap: 12px;
  align-items: baseline;
  margin: 0 0 14px;
  font-family: var(--font-serif);
  font-weight: 700;
  font-size: clamp(21px, 5vw, 31px);
  line-height: 1.35;
}

.page-about .about-chapter__num {
  flex: 0 0 auto;
  font-family: var(--font-mono);
  font-weight: 900;
  font-size: clamp(23px, 5.6vw, 38px);
  line-height: 1;
  color: var(--gold-deep);
}

.page-about .about-chapter__body p {
  margin: 0 0 14px;
  max-width: 64ch;
  font-size: 16px;
  line-height: 1.85;
}

.page-about .about-chapter__corner {
  margin: 16px 0 0;
  padding-top: 8px;
  border-top: 1px dashed var(--line);
}

.page-about .about-corner {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  min-height: 40px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--green-deep);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color 0.12s ease, border-color 0.12s ease;
}

.page-about .about-corner:hover,
.page-about .about-corner:focus-visible {
  color: var(--ink);
  border-bottom-color: var(--cyan);
}

/* ---------- 资料卡 ---------- */
.page-about .about-facts {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 10px;
  margin: 18px 0 6px;
}

.page-about .about-fact {
  border: 2px solid var(--ink);
  background: var(--paper);
  padding: 12px 14px;
  box-shadow: var(--shadow-sm);
  transition: transform 0.14s ease, box-shadow 0.14s ease;
}

.page-about .about-fact:hover {
  transform: translate(-2px, -2px);
  box-shadow: var(--about-shadow);
}

.page-about .about-fact:nth-child(odd) {
  border-left: 6px solid var(--green);
}

.page-about .about-fact:nth-child(even) {
  border-left: 6px solid var(--gold);
}

.page-about .about-fact__value {
  display: block;
  font-family: var(--font-mono);
  font-size: 25px;
  font-weight: 900;
  line-height: 1.15;
}

.page-about .about-fact__label {
  display: block;
  margin-top: 4px;
  font-size: 13px;
  line-height: 1.6;
  color: var(--ink-70);
}

/* ---------- 四项追溯标记 ---------- */
.page-about .about-marks {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 10px;
  margin: 16px 0 6px;
}

.page-about .about-mark {
  border: 2px solid var(--ink);
  border-top: 6px solid var(--green-deep);
  background: var(--paper);
  padding: 10px 12px 12px;
  transition: background-color 0.14s ease, border-top-color 0.14s ease;
}

.page-about .about-mark:hover,
.page-about .about-mark:focus-within {
  background: var(--paper-2);
  border-top-color: var(--gold);
}

.page-about .about-mark__key {
  display: block;
  font-family: var(--font-mono);
  font-size: 14px;
  font-weight: 700;
  letter-spacing: 0.04em;
}

.page-about .about-mark__desc {
  display: block;
  margin-top: 4px;
  font-size: 13px;
  line-height: 1.65;
  color: var(--ink-70);
}

/* ---------- 团队 ---------- */
.page-about .about-team {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 12px;
  margin: 18px 0 6px;
}

.page-about .about-team__card {
  border: 2px solid var(--ink);
  border-top: 8px solid var(--green);
  background: var(--paper);
  padding: 14px;
  box-shadow: var(--shadow-sm);
}

.page-about .about-team__card:nth-child(2) {
  border-top-color: var(--gold);
}

.page-about .about-team__card:nth-child(3) {
  border-top-color: var(--violet);
}

.page-about .about-team__role {
  display: block;
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.08em;
  color: var(--green-deep);
}

.page-about .about-team__num {
  display: block;
  margin: 4px 0 8px;
  font-family: var(--font-mono);
  font-size: 26px;
  font-weight: 900;
  line-height: 1.1;
}

.page-about .about-team__text {
  margin: 0;
  font-size: 14px;
  line-height: 1.75;
  color: var(--ink-70);
}

/* ---------- 市州 ---------- */
.page-about .about-cities {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  list-style: none;
  margin: 14px 0 4px;
  padding: 0;
}

.page-about .about-cities li {
  border: 1px solid var(--green-deep);
  background: var(--paper);
  color: var(--green-deep);
  font-size: 13px;
  line-height: 1.4;
  padding: 5px 10px;
}

/* ---------- 时间线 ---------- */
.page-about .about-timeline {
  list-style: none;
  margin: 18px 0 0;
  padding: 0;
  position: relative;
}

.page-about .about-timeline::before {
  content: "";
  position: absolute;
  left: 10px;
  top: 10px;
  bottom: 10px;
  width: 2px;
  background: var(--line);
}

.page-about .about-timeline__item {
  position: relative;
  padding: 0 0 22px 38px;
}

.page-about .about-timeline__item::before {
  content: "";
  position: absolute;
  left: 0;
  top: 5px;
  width: 16px;
  height: 16px;
  background: var(--paper);
  border: 3px solid var(--ink);
  transform: rotate(45deg);
}

.page-about .about-timeline__item:last-child::before {
  background: var(--gold);
  border-color: var(--gold-deep);
}

.page-about .about-timeline__year {
  display: inline-block;
  margin-bottom: 6px;
  background: var(--ink);
  color: var(--paper);
  font-family: var(--font-mono);
  font-weight: 900;
  font-size: 14px;
  letter-spacing: 0.04em;
  padding: 1px 8px;
}

.page-about .about-timeline__title {
  margin: 0 0 4px;
  font-family: var(--font-sans);
  font-weight: 700;
  font-size: 16px;
  line-height: 1.5;
}

.page-about .about-timeline__text {
  margin: 0;
  max-width: 56ch;
  font-size: 15px;
  line-height: 1.8;
  color: var(--ink-70);
}

/* ---------- 社区约定 ---------- */
.page-about .about-pact {
  list-style: none;
  margin: 16px 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 10px;
}

.page-about .about-pact__item {
  display: flex;
  gap: 12px;
  border: 2px solid var(--line);
  background: var(--paper);
  padding: 12px 14px;
  transition: border-color 0.14s ease, box-shadow 0.14s ease;
}

.page-about .about-pact__item:hover {
  border-color: var(--ink);
  box-shadow: var(--shadow-sm);
}

.page-about .about-pact__item strong {
  display: block;
  font-size: 15px;
  margin-bottom: 4px;
}

.page-about .about-pact__mark {
  flex: 0 0 auto;
  font-family: var(--font-serif);
  font-weight: 700;
  font-size: 17px;
  line-height: 1.3;
  color: var(--red);
}

.page-about .about-pact__text {
  margin: 0;
  font-size: 14px;
  line-height: 1.75;
  color: var(--ink-70);
}

/* ---------- 收尾 ---------- */
.page-about .about-next {
  border: 3px solid var(--ink);
  background: var(--ink);
  color: var(--paper);
  padding: 20px 16px;
  box-shadow: var(--about-shadow);
}

.page-about .about-next__title {
  margin: 0 0 12px;
  font-family: var(--font-serif);
  font-size: clamp(20px, 4.6vw, 27px);
  line-height: 1.35;
}

.page-about .about-next__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 10px;
}

.page-about .about-next__link {
  display: block;
  padding: 12px;
  border: 2px solid var(--paper-line);
  color: var(--paper);
  text-decoration: none;
  font-size: 14px;
  line-height: 1.7;
  transition: background-color 0.14s ease, border-color 0.14s ease;
}

.page-about .about-next__link:hover,
.page-about .about-next__link:focus-visible {
  background: var(--green-deep);
  border-color: var(--gold);
}

/* ---------- 媒体容器 ---------- */
.page-about .about-figure {
  margin: 18px 0 6px;
}

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

/* ---------- 响应式 ---------- */
@media (min-width: 560px) {
  .page-about .about-hero {
    padding: 26px 0 34px;
  }

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

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

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

  .page-about .about-team__card:last-child {
    grid-column: 1 / -1;
  }
}

@media (min-width: 760px) {
  .page-about .about-next {
    padding: 24px 22px;
  }

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

  .page-about .about-cities li {
    font-size: 14px;
    padding: 6px 12px;
  }
}

@media (min-width: 1024px) {
  .page-about .about-body {
    padding: 44px 0 64px;
  }

  .page-about .layout {
    grid-template-columns: var(--about-rail) minmax(0, 1fr);
    gap: 48px;
  }

  .page-about .layout__aside {
    position: sticky;
    top: 16px;
  }

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

  .page-about .about-chapter {
    padding-top: 24px;
    margin-bottom: 52px;
  }

  .page-about .about-chapter__body p {
    font-size: 17px;
  }

  .page-about .about-hero__lead {
    font-size: 17px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-toc__link,
  .page-about .about-fact,
  .page-about .about-mark,
  .page-about .about-pact__item,
  .page-about .about-next__link,
  .page-about .about-corner,
  .page-about .about-rail__link {
    transition: none;
  }

  .page-about .about-toc__link:hover,
  .page-about .about-fact:hover {
    transform: none;
  }
}
<<<END>>>