.page-about {
  --about-rail: 168px;
  --about-line: rgba(168, 134, 60, .34);
  --about-inrule: rgba(198, 190, 177, .14);
  background: var(--ink-900);
  color: var(--paper-light);
  font-family: var(--font-body);
}

.page-about .num {
  font-family: var(--font-mono);
  letter-spacing: .08em;
}

.page-about .section {
  padding-block: clamp(56px, 7vw, 96px);
}

.page-about .section--paper {
  background: var(--paper);
  color: var(--ink-900);
}

/* ---------- 顶部标签行 ---------- */
.page-about .about-topline {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  justify-content: space-between;
  gap: 8px 24px;
  padding-top: 26px;
}

.page-about .about-topline__meta {
  margin: 0;
  font-size: 12px;
  letter-spacing: .14em;
  color: var(--note-blue);
}

.page-about .breadcrumb__link {
  color: var(--note-blue);
  text-decoration: none;
}

.page-about .breadcrumb__link:hover,
.page-about .breadcrumb__link:focus-visible {
  color: var(--gold-400);
}

.page-about .breadcrumb__sep {
  color: rgba(198, 190, 177, .38);
}

.page-about .breadcrumb__current {
  color: var(--paper-light);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  padding: 40px 0 62px;
}

.page-about .about-hero__mark {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px 18px;
  margin-bottom: 30px;
}

.page-about .about-hero__mark .archive-mark__week {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .2em;
  color: var(--gold-400);
}

.page-about .about-hero__mark .archive-mark__type {
  font-size: 12px;
  letter-spacing: .14em;
  color: var(--note-blue);
  border: 1px solid rgba(168, 134, 60, .45);
  border-radius: var(--r);
  padding: 3px 9px;
}

.page-about .about-hero__title {
  margin: 0 0 30px;
  font-family: var(--font-display);
  font-size: clamp(40px, 11vw, 104px);
  font-weight: 800;
  line-height: .94;
  letter-spacing: -.02em;
  color: var(--paper-light);
  word-break: break-word;
}

.page-about .about-hero__aside {
  max-width: 46ch;
}

.page-about .about-hero__lede {
  margin: 0 0 26px;
  font-size: 16px;
  line-height: 1.8;
  color: rgba(246, 242, 234, .76);
}

.page-about .about-hero__kv {
  list-style: none;
  margin: 0;
  padding: 0;
  border-top: 1px solid var(--about-inrule);
}

.page-about .about-hero__kv .kv__item {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 16px;
  padding: 11px 0;
  border-bottom: 1px solid var(--about-inrule);
}

.page-about .about-hero__kv .kv__label {
  font-size: 13px;
  letter-spacing: .06em;
  color: var(--note-blue);
}

.page-about .about-hero__kv .kv__value {
  font-family: var(--font-mono);
  font-size: 15px;
  letter-spacing: .08em;
  color: var(--gold-400);
}

.page-about .about-hero__ticks {
  display: flex;
  align-items: flex-end;
  gap: 4px;
  height: 56px;
  margin-top: 44px;
  border-bottom: 1px solid rgba(168, 134, 60, .3);
}

.page-about .about-hero__ticks .tick-strip__item {
  display: block;
  flex: 1 1 0;
  height: var(--h, 30%);
  min-height: 4px;
  background: rgba(198, 190, 177, .22);
  border-radius: 1px;
}

.page-about .about-hero__ticks .tick-strip__item--now {
  background: var(--jade);
  box-shadow: 0 0 12px rgba(44, 180, 154, .4);
}

@media (min-width: 900px) {
  .page-about .about-hero {
    display: grid;
    grid-template-columns: minmax(0, 7fr) minmax(280px, 4fr);
    column-gap: 56px;
    align-items: end;
    padding: 56px 0 84px;
  }

  .page-about .about-hero__mark { grid-column: 1 / -1; }
  .page-about .about-hero__title { grid-column: 1; margin-bottom: 0; }
  .page-about .about-hero__aside { grid-column: 2; padding-bottom: 4px; }
  .page-about .about-hero__ticks { grid-column: 1 / -1; }
}

/* ---------- 通用章节头 ---------- */
.page-about .section__kicker {
  margin: 0 0 16px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .2em;
  color: var(--jade);
}

.page-about .section__title {
  margin: 0 0 20px;
  font-family: var(--font-display);
  font-size: clamp(28px, 4.6vw, 44px);
  font-weight: 800;
  line-height: 1.06;
  letter-spacing: -.01em;
  color: var(--paper-light);
}

.page-about .section__lede {
  margin: 0;
  max-width: 56ch;
  font-size: 16px;
  line-height: 1.8;
  color: rgba(246, 242, 234, .72);
}

.page-about .section--paper .section__kicker { color: var(--gold-700); }
.page-about .section--paper .section__title { color: var(--ink-900); }
.page-about .section--paper .section__lede { color: rgba(14, 23, 48, .74); }

/* ---------- 沿革纵轴 ---------- */
.page-about .about-years {
  margin-bottom: 42px;
}

.page-about .about-years__title {
  margin: 0 0 14px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .2em;
  color: var(--note-blue);
}

.page-about .about-years__list {
  display: flex;
  gap: 8px;
  list-style: none;
  margin: 0;
  padding: 0 0 8px;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
}

.page-about .about-years__item { flex: 0 0 auto; }

.page-about .about-years__link {
  display: flex;
  align-items: baseline;
  gap: 8px;
  padding: 7px 12px;
  border: 1px solid rgba(168, 134, 60, .4);
  border-radius: var(--r);
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: .1em;
  color: var(--paper-light);
  text-decoration: none;
  transition: color var(--dur) var(--ease), border-color var(--dur) var(--ease), background-color var(--dur) var(--ease);
}

.page-about .about-years__link:hover,
.page-about .about-years__link:focus-visible {
  border-color: var(--gold-400);
  color: var(--gold-400);
  background: rgba(168, 134, 60, .08);
}

.page-about .about-years__tag {
  font-family: var(--font-body);
  font-size: 12px;
  letter-spacing: .04em;
  color: var(--note-blue);
}

.page-about .about-years__link:hover .about-years__tag,
.page-about .about-years__link:focus-visible .about-years__tag {
  color: var(--jade);
}

.page-about .about-axis__head {
  margin-bottom: 52px;
}

.page-about .about-nodes {
  list-style: none;
  margin: 0;
  padding: 0;
}

.page-about .about-node,
.page-about .about-interlude {
  position: relative;
  padding: 0 0 56px 26px;
  border-left: 1px solid var(--about-line);
}

.page-about .about-node::before {
  content: "";
  position: absolute;
  left: -4px;
  top: 12px;
  width: 7px;
  height: 7px;
  background: var(--gold-700);
  transform: rotate(45deg);
}

.page-about .about-node--jade::before {
  background: var(--jade);
  box-shadow: 0 0 0 4px rgba(44, 180, 154, .14);
}

.page-about .about-node__title {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 12px;
  margin: 0 0 16px;
  font-weight: 400;
}

.page-about .about-node__year {
  font-family: var(--font-mono);
  font-size: clamp(28px, 5.6vw, 46px);
  line-height: 1;
  letter-spacing: .08em;
  color: var(--gold-400);
}

.page-about .about-node--jade .about-node__year {
  color: var(--jade);
}

.page-about .about-node__line {
  margin: 0 0 12px;
  max-width: 40ch;
  font-size: 17px;
  line-height: 1.75;
  color: var(--paper-light);
}

.page-about .about-node__add {
  margin: 0;
  max-width: 46ch;
  font-size: 14px;
  line-height: 1.75;
  color: rgba(246, 242, 234, .6);
}

.page-about .about-node__figure {
  margin: 26px 0 0;
  max-width: 520px;
}

@media (min-width: 960px) {
  .page-about .about-axis__inner {
    display: grid;
    grid-template-columns: var(--about-rail) minmax(0, 1fr);
    column-gap: 64px;
    align-items: start;
  }

  .page-about .about-years {
    position: sticky;
    top: calc(var(--header-h) + 40px);
    margin-bottom: 0;
  }

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

  .page-about .about-years__link {
    justify-content: flex-start;
    padding: 8px 0 8px 16px;
    border: 0;
    border-left: 1px solid rgba(198, 190, 177, .2);
    border-radius: 0;
    background: none;
  }

  .page-about .about-years__link:hover,
  .page-about .about-years__link:focus-visible {
    background: none;
    border-left-color: var(--jade);
  }

  .page-about .about-years__link[aria-current] {
    color: var(--gold-400);
    border-left-color: var(--gold-400);
  }

  .page-about .about-node,
  .page-about .about-interlude {
    padding-left: 40px;
    padding-bottom: 78px;
  }
}

/* ---------- 通用图片 ---------- */
.page-about .figure {
  margin: 0;
}

.page-about .figure__frame {
  position: relative;
  overflow: hidden;
  background: var(--ink-800);
  border: 1px solid rgba(168, 134, 60, .3);
}

.page-about .figure__media {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
}

.page-about .figure__caption {
  margin-top: 12px;
  max-width: 44ch;
  font-size: 12px;
  line-height: 1.7;
  color: var(--note-blue);
}

.page-about .section--paper .figure__caption {
  color: rgba(14, 23, 48, .6);
}

.page-about .section--paper .figure__frame {
  background: #E4DDD2;
  border-color: rgba(14, 23, 48, .18);
}

/* ---------- 记录原则 ---------- */
.page-about .about-principles__head {
  margin-bottom: 40px;
}

.page-about .about-principle {
  padding: 24px 0 6px;
  border-top: 1px solid rgba(14, 23, 48, .2);
}

.page-about .about-principle__no {
  margin: 0 0 14px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .2em;
  color: var(--gold-700);
}

.page-about .about-principle__title {
  margin: 0 0 12px;
  font-family: var(--font-display);
  font-size: 22px;
  font-weight: 800;
  letter-spacing: .01em;
  color: var(--ink-900);
}

.page-about .about-principle__text {
  margin: 0;
  font-size: 15px;
  line-height: 1.8;
  color: rgba(14, 23, 48, .76);
}

.page-about .about-scale {
  margin-top: 48px;
  padding-top: 26px;
  border-top: 1px solid rgba(14, 23, 48, .16);
}

.page-about .about-scale__label {
  margin: 0 0 14px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .16em;
  color: var(--ink-800);
}

.page-about .about-scale__grid {
  height: 34px;
  background-color: rgba(14, 23, 48, .05);
  background-image:
    linear-gradient(to right, rgba(14, 23, 48, .42) 0 1px, transparent 1px),
    linear-gradient(to right, rgba(14, 23, 48, .16) 0 1px, transparent 1px);
  background-size: calc(100% / 24) 100%, calc(100% / 96) 100%;
  background-repeat: repeat-x;
  border-bottom: 1px solid rgba(14, 23, 48, .22);
}

.page-about .about-scale__note {
  margin: 14px 0 0;
  max-width: 62ch;
}

/* ---------- 维护与人手 ---------- */
.page-about .about-team__head {
  margin-bottom: 36px;
}

.page-about .about-team__lede {
  margin: 0 0 28px;
  max-width: 52ch;
  font-size: 16px;
  line-height: 1.8;
  color: rgba(246, 242, 234, .78);
}

.page-about .about-team__list {
  list-style: none;
  margin: 0;
  padding: 0;
}

.page-about .about-team__list li {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 6px;
  padding: 16px 0;
  border-top: 1px solid var(--about-inrule);
  font-size: 15px;
  line-height: 1.75;
  color: rgba(246, 242, 234, .72);
}

.page-about .about-team__k {
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: .12em;
  color: var(--jade);
}

.page-about .about-team__figure {
  margin-top: 38px;
}

.page-about .about-team__foot {
  margin: 42px 0 0;
  padding-top: 20px;
  max-width: 62ch;
  border-top: 1px solid var(--about-inrule);
  color: var(--note-blue);
}

@media (min-width: 700px) {
  .page-about .about-team__list li {
    grid-template-columns: 92px minmax(0, 1fr);
    gap: 22px;
    align-items: baseline;
  }
}

@media (min-width: 900px) {
  .page-about .about-team__figure {
    margin-top: 4px;
  }
}

/* ---------- 查阅方式 ---------- */
.page-about .about-readers {
  background: var(--ink-800);
}

.page-about .about-readers__head {
  margin-bottom: 8px;
}

.page-about .about-paths {
  list-style: none;
  margin: 40px 0 0;
  padding: 0;
}

.page-about .about-path {
  padding: 26px 0;
  max-width: 64ch;
  border-top: 1px solid var(--about-inrule);
}

.page-about .about-path__title {
  margin: 0 0 10px;
  font-family: var(--font-display);
  font-size: 20px;
  font-weight: 800;
  letter-spacing: .02em;
  color: var(--gold-400);
}

.page-about .about-path p {
  margin: 0;
  font-size: 15px;
  line-height: 1.8;
  color: rgba(246, 242, 234, .72);
}

.page-about .about-readers__stat {
  margin: 40px 0 0;
  max-width: 54ch;
  font-size: 16px;
  line-height: 1.8;
  color: var(--paper-light);
}

.page-about .about-readers__stat .num {
  font-size: 20px;
  color: var(--jade);
}

/* ---------- 对外口径与边界 ---------- */
.page-about .about-scope__head {
  margin-bottom: 36px;
}

.page-about .about-scope__body p {
  margin: 0 0 18px;
  max-width: 52ch;
  font-size: 16px;
  line-height: 1.8;
  color: rgba(14, 23, 48, .78);
}

.page-about .about-scope__aside {
  margin-top: 30px;
}

.page-about .about-scope__box {
  padding: 2px 0 2px 20px;
  border-left: 2px solid var(--gold-700);
}

.page-about .about-scope__box h3 {
  margin: 0 0 12px;
  font-family: var(--font-display);
  font-size: 18px;
  font-weight: 800;
  color: var(--ink-900);
}

.page-about .about-scope__box p {
  margin: 0 0 12px;
  font-size: 14px;
  line-height: 1.8;
  color: rgba(14, 23, 48, .74);
}

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

.page-about .about-scope__box .num {
  color: var(--rust);
}

.page-about .about-scope__links {
  margin: 42px 0 0;
  padding-top: 22px;
  border-top: 1px solid rgba(14, 23, 48, .16);
  font-size: 15px;
  line-height: 2;
  color: rgba(14, 23, 48, .7);
}

.page-about .about-scope__links a {
  color: var(--gold-700);
  text-decoration: none;
  border-bottom: 1px solid rgba(168, 134, 60, .5);
  transition: color var(--dur) var(--ease), border-color var(--dur) var(--ease);
}

.page-about .about-scope__links a:hover,
.page-about .about-scope__links a:focus-visible {
  color: var(--ink-900);
  border-bottom-color: var(--ink-900);
}

@media (min-width: 900px) {
  .page-about .about-scope__aside {
    margin-top: 6px;
  }
}

/* ---------- 版本区间一览 ---------- */
.page-about .about-outline {
  border-top: 1px solid rgba(168, 134, 60, .28);
}

.page-about .about-outline__head {
  margin-bottom: 12px;
}

.page-about .about-ruler__wrap {
  margin-top: 44px;
  padding-bottom: 10px;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
}

.page-about .about-ruler {
  display: flex;
  gap: 6px;
  list-style: none;
  margin: 0;
  padding: 0;
  min-width: 620px;
}

.page-about .about-ruler__seg {
  flex: var(--span, 3) 1 0;
  min-width: 0;
}

.page-about .about-ruler__link {
  display: block;
  padding: 14px 12px 16px;
  background: rgba(22, 36, 76, .92);
  border-top: 2px solid var(--gold-700);
  text-decoration: none;
  transition: background-color var(--dur) var(--ease), border-color var(--dur) var(--ease);
}

.page-about .about-ruler__link:hover,
.page-about .about-ruler__link:focus-visible {
  background: var(--ink-750);
  border-top-color: var(--jade);
}

.page-about .about-ruler__year {
  display: block;
  font-family: var(--font-mono);
  font-size: 15px;
  letter-spacing: .1em;
  color: var(--gold-400);
}

.page-about .about-ruler__name {
  display: block;
  margin-top: 4px;
  font-size: 14px;
  font-weight: 600;
  color: var(--paper-light);
}

.page-about .about-ruler__brief {
  display: block;
  margin-top: 4px;
  font-size: 12px;
  color: var(--note-blue);
}

.page-about .about-ruler__detail {
  margin: 0;
  padding: 0 12px;
  max-height: 0;
  overflow: hidden;
  opacity: 0;
  font-size: 12px;
  line-height: 1.7;
  color: var(--note-blue);
  transition: max-height var(--dur) var(--ease), opacity var(--dur) var(--ease), padding-top var(--dur) var(--ease);
}

.page-about .about-ruler__seg:hover .about-ruler__detail,
.page-about .about-ruler__seg:focus-within .about-ruler__detail {
  max-height: 100px;
  padding-top: 10px;
  opacity: 1;
}

.page-about .about-outline__foot {
  margin: 34px 0 0;
  max-width: 60ch;
  font-size: 15px;
  line-height: 1.9;
  color: rgba(246, 242, 234, .62);
}

.page-about .about-outline__foot a {
  color: var(--gold-400);
  text-decoration: none;
  border-bottom: 1px solid rgba(216, 176, 99, .45);
}

.page-about .about-outline__foot a:hover,
.page-about .about-outline__foot a:focus-visible {
  color: var(--jade);
  border-bottom-color: var(--jade);
}

.page-about {
  --h: 1rem;
  --span: inherit;
}