.page-about {
  --about-rail: 208px;
}

.page-about .about-shell {
  padding-block: 24px 72px;
}

.page-about .about-context {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px 16px;
  margin-bottom: 22px;
}

.page-about .about-context__sep {
  color: var(--gray);
}

.page-about .about-context__note {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .06em;
  color: var(--gray);
}

.page-about .about-layout {
  display: grid;
  grid-template-columns: 1fr;
  gap: 30px;
}

.page-about .about-body {
  min-width: 0;
}

@media (min-width: 1080px) {
  .page-about .about-layout {
    grid-template-columns: var(--about-rail) minmax(0, 1fr);
    gap: 52px;
    align-items: start;
  }
}

/* 章节索引与年份刻度 */
.page-about .about-index {
  border: var(--edge);
  background: var(--paper);
  box-shadow: var(--hard-sm);
  padding: 16px 14px;
  max-width: 100%;
}

@media (min-width: 1080px) {
  .page-about .about-index {
    position: sticky;
    top: calc(var(--header-h) + 20px);
  }
}

.page-about .about-index__title {
  margin: 0 0 12px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .12em;
  color: var(--gray);
}

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

@media (min-width: 1080px) {
  .page-about .about-index__list {
    flex-direction: column;
    overflow: visible;
    gap: 2px;
  }
}

.page-about .about-index__link {
  display: flex;
  align-items: baseline;
  gap: 9px;
  padding: 7px 10px;
  border-left: 3px solid var(--line);
  font-size: 13px;
  line-height: 1.4;
  color: var(--ink);
  text-decoration: none;
  white-space: nowrap;
  transition: border-color .18s ease, background-color .18s ease;
}

.page-about .about-index__link:hover,
.page-about .about-index__link:focus-visible {
  border-left-color: var(--accent);
  background: #ffffff;
}

.page-about .about-index__num {
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 700;
  color: var(--accent);
}

.page-about .about-scale {
  margin-top: 16px;
  padding-top: 14px;
  border-top: var(--hair);
}

.page-about .about-scale__title {
  margin: 0 0 10px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .1em;
  color: var(--gray);
}

.page-about .about-scale__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 6px 16px;
  font-size: 13px;
  line-height: 1.55;
  color: var(--panel);
}

@media (min-width: 1080px) {
  .page-about .about-scale__list {
    flex-direction: column;
    gap: 0;
  }
}

.page-about .about-scale__item {
  position: relative;
  padding-left: 16px;
}

.page-about .about-scale__item::before {
  content: "";
  position: absolute;
  left: 0;
  top: .62em;
  width: 9px;
  height: 3px;
  background: var(--accent);
}

@media (min-width: 1080px) {
  .page-about .about-scale__item {
    padding-block: 5px;
  }
}

.page-about .about-scale__year {
  font-family: var(--font-mono);
  font-weight: 700;
  color: var(--ink);
  margin-right: 6px;
}

/* 首屏 */
.page-about .about-hero {
  position: relative;
  border: var(--edge);
  background: var(--paper);
  box-shadow: var(--hard);
  padding: 28px 18px 24px;
  overflow: hidden;
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  inset: 0 0 auto 0;
  height: 10px;
  background: linear-gradient(90deg,
    var(--green) 0 58%,
    var(--orange) 58% 86%,
    var(--yellow) 86% 100%);
}

.page-about .about-hero__kicker {
  margin: 10px 0 12px;
  color: var(--green-deep);
}

.page-about .about-hero__title {
  margin: 0 0 16px;
}

.page-about .about-hero__lede {
  margin: 0 0 22px;
  max-width: 62ch;
}

.page-about .about-hero__plates {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
  gap: 10px;
}

.page-about .about-hero__media {
  margin: 18px 0 0;
}

/* 章节通用 */
.page-about .about-section {
  margin-top: 44px;
}

@media (min-width: 1080px) {
  .page-about .about-section {
    margin-top: 60px;
  }
}

.page-about .about-section__mark {
  display: flex;
  align-items: center;
  gap: 14px;
  padding-bottom: 12px;
  border-bottom: 3px solid var(--ink);
  margin-bottom: 18px;
}

.page-about .about-section__num {
  flex: none;
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 700;
  color: var(--ink);
  background: var(--accent);
  padding: 4px 10px 4px 8px;
  clip-path: polygon(0 0, 100% 0, 100% 100%, 16% 100%, 0 74%);
}

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

.page-about .about-intro {
  margin: 0 0 20px;
  max-width: 68ch;
  font-size: 16px;
  line-height: 1.72;
  color: var(--panel);
}

.page-about .prose p {
  margin: 0 0 14px;
  font-size: 16px;
  line-height: 1.75;
  color: var(--panel);
}

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

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

@media (min-width: 900px) {
  .page-about .about-cols {
    grid-template-columns: minmax(0, 1.6fr) minmax(0, 1fr);
    gap: 34px;
    align-items: start;
  }
}

.page-about .about-note {
  border-left: 6px solid var(--orange);
  background: var(--paper);
  padding: 16px 18px;
  box-shadow: var(--hard-sm);
}

/* 三组分工 */
.page-about .about-team {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: 1fr;
  gap: 14px;
}

@media (min-width: 780px) {
  .page-about .about-team {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

.page-about .about-team__item {
  display: flex;
  gap: 14px;
  padding: 18px 16px;
  border: var(--edge);
  background: var(--paper);
  box-shadow: var(--hard-sm);
  transition: transform .2s ease, box-shadow .2s ease;
}

.page-about .about-team__item:hover {
  transform: translate(-2px, -2px);
  box-shadow: 8px 8px 0 var(--ink);
}

.page-about .about-team__num {
  flex: none;
  font-family: var(--font-mono);
  font-size: 34px;
  font-weight: 700;
  line-height: 1;
  color: var(--green-deep);
  font-variant-numeric: tabular-nums;
}

.page-about .about-team__body {
  min-width: 0;
}

.page-about .about-team__title {
  margin: 0 0 6px;
  font-size: 17px;
  font-weight: 700;
  color: var(--ink);
}

.page-about .about-team__body p {
  margin: 0;
  font-size: 15px;
  line-height: 1.65;
  color: var(--panel);
}

.page-about .about-after {
  margin: 18px 0 0;
  padding-left: 14px;
  border-left: 3px solid var(--green);
  font-size: 15px;
  line-height: 1.7;
  color: var(--panel);
}

/* 四步流程带 */
.page-about .about-flow {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: 1fr;
  border: var(--edge);
  background: var(--ink);
  box-shadow: var(--hard);
}

@media (min-width: 900px) {
  .page-about .about-flow {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

.page-about .about-flow__step {
  padding: 20px 18px 22px;
  border-top: 3px solid var(--panel);
  color: var(--text-light);
}

.page-about .about-flow__step:first-child {
  border-top: none;
}

@media (min-width: 900px) {
  .page-about .about-flow__step {
    border-top: none;
    border-left: 3px solid var(--panel);
  }

  .page-about .about-flow__step:first-child {
    border-left: none;
  }
}

.page-about .about-flow__idx {
  display: inline-block;
  margin-bottom: 10px;
  padding: 3px 16px 3px 9px;
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 700;
  color: var(--ink);
  background: var(--accent);
  clip-path: polygon(0 0, 100% 0, 100% 68%, 88% 100%, 0 100%);
}

.page-about .about-flow__title {
  margin: 0 0 8px;
  font-size: 17px;
  font-weight: 700;
  color: #ffffff;
}

.page-about .about-flow__text {
  margin: 0;
  font-size: 14px;
  line-height: 1.65;
  color: var(--text-light);
}

.page-about .about-flow__media {
  margin: 26px 0 0;
}

@media (min-width: 900px) {
  .page-about .about-flow__media {
    max-width: 620px;
  }
}

/* 封版与勘误 */
.page-about .about-seal {
  display: grid;
  grid-template-columns: 1fr;
  gap: 14px;
}

@media (min-width: 820px) {
  .page-about .about-seal {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

.page-about .about-seal__node {
  position: relative;
  border: var(--edge);
  background: var(--paper);
  padding: 18px 16px 18px 26px;
  box-shadow: var(--hard-sm);
}

.page-about .about-seal__node::before {
  content: "";
  position: absolute;
  left: -1px;
  top: -1px;
  bottom: -1px;
  width: 9px;
  background: var(--green);
}

.page-about .about-seal__node--open::before {
  background: var(--orange);
}

.page-about .about-seal__label {
  display: block;
  margin-bottom: 8px;
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 700;
  letter-spacing: .04em;
  color: var(--ink);
}

.page-about .about-seal__node p {
  margin: 0;
  font-size: 15px;
  line-height: 1.65;
  color: var(--panel);
}

.page-about .about-seal__media {
  margin: 26px 0 0;
}

/* 判断依据 */
.page-about .about-section--dark {
  margin-top: 52px;
}

.page-about .about-basis {
  padding: 26px 20px 24px;
}

.page-about .about-basis .about-section__mark {
  border-bottom-color: var(--accent);
}

.page-about .about-basis .about-section__title {
  color: #ffffff;
}

.page-about .about-basis__lede {
  margin: 0 0 22px;
  max-width: 66ch;
  font-size: 16px;
  line-height: 1.72;
  color: var(--text-light);
}

.page-about .about-basis__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 14px;
}

@media (min-width: 760px) {
  .page-about .about-basis__grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

.page-about .about-metric {
  border: 3px solid var(--panel);
  border-top: 3px solid var(--accent);
  background: rgba(0, 0, 0, .18);
  padding: 18px 16px;
}

.page-about .about-metric__key {
  display: inline-block;
  margin-bottom: 10px;
  padding: 4px 10px;
  background: var(--yellow);
  color: var(--ink);
  font-family: var(--font-mono);
  font-size: 18px;
  font-weight: 700;
}

.page-about .about-metric p {
  margin: 0;
  font-size: 15px;
  line-height: 1.68;
  color: var(--text-light);
}

.page-about .about-basis__foot {
  margin: 20px 0 0;
  padding-top: 16px;
  border-top: 1px solid rgba(232, 241, 234, .18);
  font-size: 15px;
  line-height: 1.7;
  color: var(--text-light);
}

/* 下一步入口 */
.page-about .about-next {
  margin-top: 48px;
  padding-top: 26px;
  border-top: var(--edge);
}

.page-about .about-next__title {
  margin: 0 0 10px;
}

.page-about .about-next__text {
  margin: 0 0 20px;
  max-width: 62ch;
  font-size: 16px;
  line-height: 1.72;
  color: var(--panel);
}

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

@media (prefers-reduced-motion: reduce) {
  .page-about .about-team__item,
  .page-about .about-index__link {
    transition: none;
  }

  .page-about .about-team__item:hover {
    transform: none;
  }
}