.page-about {
  --about-rule: rgba(46, 70, 117, 0.22);
  --about-rule-strong: rgba(46, 70, 117, 0.45);
  --about-soft: rgba(244, 238, 227, 0.82);
  background: var(--paper);
  color: var(--ink);
  font-family: var(--sans);
  overflow-x: hidden;
}

/* ---------- 封面 ---------- */
.page-about .about-cover {
  padding-block: clamp(26px, 5vw, 54px) clamp(34px, 6vw, 70px);
  border-bottom: 1px solid var(--about-rule);
}

.page-about .about-cover__grid {
  display: grid;
  gap: clamp(26px, 4vw, 48px);
}

.page-about .about-cover__title {
  font-family: var(--serif);
  font-weight: 900;
  font-size: clamp(33px, 6vw, 76px);
  line-height: 1.08;
  letter-spacing: -0.02em;
  color: var(--indigo);
  margin: 14px 0 0;
  text-wrap: balance;
}

.page-about .about-cover__intro {
  font-family: var(--serif);
  font-weight: 300;
  font-size: clamp(16px, 1.9vw, 19px);
  line-height: 1.92;
  color: var(--ink);
  max-width: 30em;
  margin: 22px 0 0;
}

.page-about .about-scale {
  border-top: 2px solid var(--indigo);
  padding-top: 14px;
}

.page-about .about-scale__label {
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.16em;
  color: var(--slate);
  margin: 0 0 16px;
}

.page-about .about-scale__marks {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 10px;
}

.page-about .about-scale__marks li {
  position: relative;
  padding-top: 14px;
  border-top: 1px solid var(--about-rule-strong);
}

.page-about .about-scale__marks li::before {
  content: "";
  position: absolute;
  top: -5px;
  left: 0;
  width: 1px;
  height: 9px;
  background: var(--cinnabar);
}

.page-about .about-scale__marks span {
  display: block;
  font-family: var(--mono);
  font-size: clamp(19px, 3vw, 27px);
  letter-spacing: 0.04em;
  color: var(--indigo);
}

.page-about .about-scale__marks small {
  display: block;
  margin-top: 4px;
  font-size: 11.5px;
  letter-spacing: 0.06em;
  color: var(--slate);
  line-height: 1.5;
}

@media (min-width: 880px) {
  .page-about .about-cover__grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    align-items: end;
  }
}

/* ---------- 章节轨道 ---------- */
.page-about .about-layout {
  padding-block: clamp(22px, 4vw, 44px) clamp(46px, 7vw, 92px);
}

.page-about .about-toc {
  border-bottom: 1px solid var(--about-rule);
  padding-bottom: 14px;
  margin-bottom: clamp(26px, 5vw, 34px);
}

.page-about .about-toc__label {
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.16em;
  color: var(--cinnabar);
  margin: 0 0 10px;
}

.page-about .about-toc__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  gap: 8px;
  overflow-x: auto;
  padding-bottom: 4px;
  scrollbar-width: thin;
}

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

.page-about .about-toc__list a {
  display: inline-flex;
  align-items: baseline;
  gap: 6px;
  padding: 6px 10px;
  border: 1px solid var(--about-rule-strong);
  color: var(--indigo);
  font-size: 13px;
  line-height: 1.4;
  text-decoration: none;
  white-space: nowrap;
}

.page-about .about-toc__num {
  font-family: var(--mono);
  font-size: 11px;
  color: var(--cinnabar);
  letter-spacing: 0.06em;
}

.page-about .about-toc__list a[aria-current="location"] {
  background: var(--indigo);
  border-color: var(--indigo);
  color: var(--paper);
}

.page-about .about-toc__list a[aria-current="location"] .about-toc__num {
  color: var(--ochre);
}

@media (min-width: 1000px) {
  .page-about .about-layout {
    display: grid;
    grid-template-columns: 190px minmax(0, 1fr);
    gap: clamp(32px, 5vw, 80px);
    align-items: start;
  }

  .page-about .about-toc {
    position: sticky;
    top: 96px;
    border-bottom: 0;
    border-left: 2px solid var(--about-rule);
    padding: 0 0 0 16px;
    margin-bottom: 0;
  }

  .page-about .about-toc__list {
    display: block;
    overflow: visible;
    padding-bottom: 0;
  }

  .page-about .about-toc__list li + li {
    margin-top: 2px;
  }

  .page-about .about-toc__list a {
    display: flex;
    gap: 10px;
    padding: 9px 0;
    border: 0;
    border-bottom: 1px solid var(--about-rule);
    white-space: normal;
    font-size: 13.5px;
    line-height: 1.45;
  }

  .page-about .about-toc__list a:hover {
    color: var(--cinnabar);
  }

  .page-about .about-toc__list a[aria-current="location"] {
    background: none;
    color: var(--cinnabar);
    border-bottom-color: var(--cinnabar);
  }

  .page-about .about-toc__list a[aria-current="location"] .about-toc__num {
    color: var(--cinnabar);
  }
}

/* ---------- 章节头 ---------- */
.page-about .about-chapter {
  padding-block: clamp(30px, 5vw, 58px);
  border-bottom: 1px solid var(--about-rule);
  scroll-margin-top: 92px;
}

.page-about .about-chapter:first-child {
  padding-top: clamp(6px, 2vw, 16px);
}

.page-about .about-chapter:last-of-type {
  border-bottom: 0;
}

.page-about .about-chapter__head {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 2px clamp(14px, 2.5vw, 28px);
  align-items: start;
  padding-top: 14px;
  border-top: 2px solid var(--indigo);
  margin-bottom: clamp(22px, 3.5vw, 38px);
}

.page-about .about-chapter__num {
  font-family: var(--mono);
  font-size: clamp(29px, 4.5vw, 50px);
  line-height: 0.92;
  letter-spacing: 0.02em;
  color: var(--cinnabar);
}

.page-about .about-chapter__title {
  font-family: var(--serif);
  font-weight: 900;
  font-size: clamp(24px, 3.2vw, 37px);
  line-height: 1.26;
  letter-spacing: -0.01em;
  color: var(--indigo);
  margin: 0 0 8px;
}

.page-about .about-chapter__lede {
  font-family: var(--serif);
  font-weight: 300;
  font-size: clamp(15px, 1.8vw, 18px);
  line-height: 1.85;
  color: var(--slate);
  margin: 0;
  max-width: 32em;
}

/* ---------- 通用正文 ---------- */
.page-about .about-prose {
  margin-bottom: clamp(18px, 3vw, 28px);
}

.page-about .about-prose p {
  font-size: 16px;
  line-height: 1.95;
  color: var(--ink);
  max-width: 34em;
  margin: 0 0 1.1em;
}

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

.page-about .about-quote {
  font-family: var(--serif);
  font-weight: 300;
  font-size: clamp(20px, 2.8vw, 29px);
  line-height: 1.66;
  color: var(--indigo);
  max-width: 26em;
  margin: clamp(24px, 4vw, 42px) 0;
  padding-left: clamp(16px, 5.5vw, 64px);
  border-left: 2px solid var(--ochre);
}

/* ---------- 图文错位 ---------- */
.page-about .about-split {
  display: grid;
  gap: clamp(20px, 3vw, 34px);
  margin-bottom: clamp(22px, 3.5vw, 34px);
}

@media (min-width: 860px) {
  .page-about .about-split {
    grid-template-columns: minmax(0, 1.4fr) minmax(0, 1fr);
    align-items: start;
  }
}

.page-about .about-figure {
  margin: 0 0 clamp(20px, 3vw, 32px);
}

.page-about .about-figure--inline {
  max-width: 520px;
  margin-inline: 0 auto;
  margin-top: clamp(24px, 3.5vw, 36px);
}

.page-about .about-figure img {
  display: block;
  width: 100%;
  height: auto;
  max-width: 100%;
  object-fit: cover;
  border: 1px solid var(--about-rule-strong);
  box-shadow: var(--shadow-sheet);
  background: var(--paper-shade);
}

.page-about .about-figure figcaption {
  margin-top: 10px;
  padding-left: 10px;
  border-left: 2px solid var(--ochre);
  font-size: 12px;
  line-height: 1.75;
  letter-spacing: 0.04em;
  color: var(--slate);
}

/* ---------- 时间刻度 ---------- */
.page-about .about-timeline {
  list-style: none;
  margin: 0 0 clamp(22px, 3.5vw, 36px);
  padding: 0;
  position: relative;
}

.page-about .about-timeline::before {
  content: "";
  position: absolute;
  left: 24px;
  top: 14px;
  bottom: 14px;
  border-left: 1px dashed rgba(46, 70, 117, 0.5);
}

.page-about .about-timeline__item {
  position: relative;
  padding-left: clamp(52px, 9vw, 72px);
  padding-bottom: clamp(20px, 3vw, 30px);
}

.page-about .about-timeline__item:last-child {
  padding-bottom: 0;
}

.page-about .about-timeline__item::before {
  content: "";
  position: absolute;
  left: 17px;
  top: 14px;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--paper);
  border: 2px solid var(--cinnabar);
  box-sizing: border-box;
}

.page-about .about-timeline__year {
  display: inline-block;
  font-family: var(--mono);
  font-size: clamp(26px, 4.2vw, 42px);
  line-height: 1.1;
  letter-spacing: 0.04em;
  color: var(--indigo);
  text-decoration: none;
  border-bottom: 1px solid transparent;
}

.page-about .about-timeline__year:hover,
.page-about .about-timeline__year:focus-visible {
  color: var(--cinnabar);
  border-bottom-color: var(--cinnabar);
}

.page-about .about-timeline__label {
  display: block;
  margin-top: 6px;
  font-size: 13px;
  letter-spacing: 0.1em;
  color: var(--slate);
}

.page-about .about-epochs {
  display: grid;
  gap: clamp(16px, 2.4vw, 24px);
}

.page-about .about-epoch {
  padding: clamp(16px, 2.4vw, 24px) clamp(16px, 2.4vw, 26px);
  background: var(--paper-shade);
  border-left: 3px solid var(--indigo-mid);
  scroll-margin-top: 92px;
}

.page-about .about-epoch h3 {
  font-family: var(--serif);
  font-weight: 600;
  font-size: clamp(16px, 2vw, 19px);
  color: var(--indigo);
  margin: 0 0 8px;
  line-height: 1.5;
}

.page-about .about-epoch p {
  font-size: 15.5px;
  line-height: 1.9;
  color: var(--ink);
  margin: 0;
  max-width: 36em;
}

/* ---------- 三条原则 ---------- */
.page-about .about-principles {
  list-style: none;
  margin: 0 0 clamp(22px, 3.5vw, 34px);
  padding: 0;
  display: grid;
  gap: clamp(16px, 2.4vw, 26px);
}

.page-about .about-principles > li {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 2px clamp(12px, 2vw, 22px);
  padding-bottom: clamp(14px, 2vw, 20px);
  border-bottom: 1px solid var(--about-rule);
}

.page-about .about-principles__num {
  font-family: var(--mono);
  font-size: 18px;
  letter-spacing: 0.06em;
  color: var(--cinnabar);
  line-height: 1.6;
}

.page-about .about-principles h3 {
  grid-column: 2;
  font-family: var(--serif);
  font-weight: 900;
  font-size: clamp(18px, 2.2vw, 22px);
  color: var(--indigo);
  margin: 0 0 6px;
  line-height: 1.45;
}

.page-about .about-principles p {
  grid-column: 2;
  font-size: 15.5px;
  line-height: 1.9;
  color: var(--ink);
  margin: 0;
  max-width: 34em;
}

/* ---------- 对照表 ---------- */
.page-about .about-table-wrap {
  overflow-x: auto;
  margin: clamp(20px, 3vw, 32px) 0;
  border: 1px solid var(--about-rule-strong);
  background: var(--paper-white);
}

.page-about .about-table {
  width: 100%;
  min-width: 480px;
  border-collapse: collapse;
  font-size: 14.5px;
}

.page-about .about-table caption {
  text-align: left;
  padding: 12px 14px;
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.16em;
  color: var(--slate);
  border-bottom: 1px solid var(--about-rule);
}

.page-about .about-table th,
.page-about .about-table td {
  padding: 12px 14px;
  text-align: left;
  vertical-align: top;
  line-height: 1.75;
  border-bottom: 1px solid var(--about-rule);
}

.page-about .about-table thead th {
  background: var(--indigo);
  color: var(--paper);
  font-weight: 500;
  font-size: 12.5px;
  letter-spacing: 0.08em;
}

.page-about .about-table tbody th {
  font-family: var(--mono);
  font-weight: 400;
  font-size: 13px;
  color: var(--cinnabar);
  white-space: nowrap;
}

.page-about .about-table tbody tr:nth-child(even) {
  background: var(--paper-shade);
}

.page-about .about-table tbody tr:last-child th,
.page-about .about-table tbody tr:last-child td {
  border-bottom: 0;
}

/* ---------- 四组分类 ---------- */
.page-about .about-groups {
  list-style: none;
  margin: 0 0 clamp(20px, 3vw, 30px);
  padding: 0;
  display: grid;
  gap: clamp(14px, 2.2vw, 22px);
}

.page-about .about-groups > li {
  background: var(--paper-white);
  border: 1px solid var(--about-rule);
  border-top: 3px solid var(--ochre);
  padding: clamp(16px, 2.4vw, 24px);
  box-shadow: var(--shadow-sheet);
}

.page-about .about-groups__head {
  display: flex;
  align-items: baseline;
  flex-wrap: wrap;
  gap: 8px 10px;
  margin-bottom: 8px;
}

.page-about .about-groups__code {
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.16em;
  color: var(--cinnabar);
}

.page-about .about-groups h3 {
  font-family: var(--serif);
  font-weight: 900;
  font-size: clamp(17px, 2vw, 20px);
  color: var(--indigo);
  margin: 0;
  line-height: 1.4;
}

.page-about .about-groups p {
  font-size: 15px;
  line-height: 1.9;
  color: var(--ink);
  margin: 0;
}

@media (min-width: 820px) {
  .page-about .about-groups {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    column-gap: clamp(20px, 3.5vw, 44px);
  }

  .page-about .about-groups > li:nth-child(odd) {
    margin-left: clamp(0px, 2.6vw, 36px);
  }

  .page-about .about-groups > li:nth-child(even) {
    margin-right: clamp(0px, 2.6vw, 36px);
  }
}

/* ---------- 团队面板 ---------- */
.page-about .about-team {
  background: var(--indigo);
  color: var(--paper);
  padding: clamp(20px, 3.4vw, 40px);
  box-shadow: var(--shadow-sheet);
  margin: clamp(18px, 3vw, 30px) 0;
}

.page-about .about-team__grid {
  display: grid;
  gap: clamp(20px, 2.8vw, 30px);
}

.page-about .about-team__num {
  display: block;
  font-family: var(--mono);
  font-size: clamp(30px, 4vw, 44px);
  line-height: 1;
  letter-spacing: 0.02em;
  color: var(--ochre);
}

.page-about .about-team__role {
  display: block;
  margin: 10px 0 8px;
  font-family: var(--serif);
  font-weight: 600;
  font-size: 17px;
  letter-spacing: 0.02em;
  color: var(--paper);
}

.page-about .about-team__cell p {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.85;
  color: var(--about-soft);
}

@media (min-width: 820px) {
  .page-about .about-team__grid {
    grid-template-columns: minmax(0, 1.15fr) minmax(0, 0.95fr) minmax(0, 0.8fr);
    align-items: start;
  }

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

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

/* ---------- 校订节奏 ---------- */
.page-about .about-rhythm {
  list-style: none;
  margin: 0 0 clamp(18px, 3vw, 28px);
  padding: 0;
  border-top: 1px solid var(--about-rule);
}

.page-about .about-rhythm li {
  display: grid;
  gap: 4px;
  padding: clamp(14px, 2vw, 18px) 0;
  border-bottom: 1px solid var(--about-rule);
}

.page-about .about-rhythm__when {
  font-family: var(--mono);
  font-size: 12.5px;
  letter-spacing: 0.14em;
  color: var(--cinnabar);
}

.page-about .about-rhythm li p {
  margin: 0;
  font-size: 15.5px;
  line-height: 1.9;
  color: var(--ink);
  max-width: 36em;
}

@media (min-width: 700px) {
  .page-about .about-rhythm li {
    grid-template-columns: 132px minmax(0, 1fr);
    gap: clamp(16px, 3vw, 32px);
    align-items: baseline;
  }
}

/* ---------- 协作伙伴 ---------- */
.page-about .about-partners {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: clamp(18px, 2.6vw, 26px);
}

.page-about .about-partners > li {
  padding-top: 12px;
  border-top: 2px solid var(--turquoise);
}

.page-about .about-partners h3 {
  font-family: var(--sans);
  font-weight: 500;
  font-size: 15px;
  letter-spacing: 0.04em;
  color: var(--indigo);
  margin: 0 0 6px;
}

.page-about .about-partners p {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.85;
  color: var(--slate);
  max-width: 30em;
}

@media (min-width: 760px) {
  .page-about .about-partners {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    column-gap: clamp(24px, 4vw, 56px);
  }

  .page-about .about-partners > li:nth-child(2) {
    margin-top: 34px;
  }
}

/* ---------- 数字 ---------- */
.page-about .about-stats {
  list-style: none;
  margin: 0 0 clamp(18px, 3vw, 28px);
  padding: 0;
  display: grid;
  gap: clamp(14px, 2.2vw, 20px);
}

.page-about .about-stats li {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 4px clamp(12px, 2vw, 20px);
  align-items: baseline;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--about-rule);
}

.page-about .about-stats__value {
  font-family: var(--mono);
  font-size: clamp(25px, 3.6vw, 37px);
  line-height: 1.1;
  letter-spacing: 0.01em;
  color: var(--indigo);
  white-space: nowrap;
}

.page-about .about-stats__label {
  font-size: 14.5px;
  line-height: 1.8;
  color: var(--slate);
}

@media (min-width: 700px) {
  .page-about .about-stats {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    column-gap: clamp(24px, 4vw, 56px);
  }
}

/* ---------- 结语 ---------- */
.page-about .about-cta {
  margin-top: clamp(30px, 5vw, 54px);
  padding: clamp(20px, 3.4vw, 40px);
  background: var(--paper-shade);
  border-left: 3px solid var(--cinnabar);
}

.page-about .about-cta h2 {
  font-family: var(--serif);
  font-weight: 900;
  font-size: clamp(20px, 2.6vw, 26px);
  color: var(--indigo);
  margin: 0 0 10px;
  line-height: 1.4;
}

.page-about .about-cta p {
  font-size: 15.5px;
  line-height: 1.9;
  color: var(--ink);
  margin: 0 0 18px;
  max-width: 32em;
}

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

@media (prefers-reduced-motion: reduce) {
  .page-about .about-timeline__year {
    transition: none;
  }
}
</br>