/* ===== 档案沿革（/history/）页面专属样式 ===== */
.page-about {
  --about-gap: clamp(3rem, 8vw, 6.5rem);
  --about-rule: 1px solid var(--c-line);
  --about-rail: 3.25rem;
  background: var(--c-night);
  color: var(--c-chalk);
}

.page-about .cdx-text {
  max-width: 38em;
  overflow-wrap: anywhere;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  overflow: hidden;
  padding: clamp(1.25rem, 3vw, 2rem) 0 clamp(2.5rem, 7vw, 5rem);
  border-bottom: var(--about-rule);
  background:
    radial-gradient(120% 90% at 86% 0%, rgba(43, 233, 200, 0.13), transparent 62%),
    var(--c-night);
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(to right, rgba(42, 74, 65, 0.55) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(42, 74, 65, 0.55) 1px, transparent 1px);
  background-size: 76px 76px;
  -webkit-mask-image: linear-gradient(180deg, #000 0%, transparent 88%);
  mask-image: linear-gradient(180deg, #000 0%, transparent 88%);
  pointer-events: none;
}

.page-about .about-hero .cdx-shell {
  position: relative;
  z-index: 1;
}

.page-about .about-hero .cdx-breadcrumb {
  margin-bottom: clamp(1.5rem, 5vw, 2.75rem);
}

.page-about .about-hero__stage {
  position: relative;
  display: grid;
  gap: clamp(1.75rem, 5vw, 3rem);
}

.page-about .about-hero__ghost {
  position: absolute;
  top: -0.28em;
  right: -0.04em;
  margin: 0;
  font-family: var(--f-mono);
  font-size: clamp(5rem, 20vw, 14rem);
  font-weight: 700;
  line-height: 0.8;
  letter-spacing: -0.05em;
  color: transparent;
  -webkit-text-stroke: 1px rgba(43, 233, 200, 0.18);
  pointer-events: none;
  user-select: none;
  z-index: -1;
}

.page-about .about-hero__title {
  margin: 0.75rem 0 1.25rem;
  font-family: var(--f-display);
  font-weight: 900;
  font-size: clamp(2.25rem, 7.4vw, 4.6rem);
  line-height: 1.06;
  letter-spacing: -0.02em;
  color: var(--c-chalk);
}

.page-about .about-hero__title span {
  display: block;
  color: var(--c-accent);
}

.page-about .about-hero__lead {
  margin: 0;
  max-width: 40em;
  color: var(--c-chalk);
}

.page-about .about-facts {
  margin: 0;
  border: var(--about-rule);
  background: var(--c-stand);
}

.page-about .about-fact {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 1rem;
  margin: 0;
  padding: 0.8rem 1rem;
  border-bottom: 1px solid var(--c-line);
}

.page-about .about-fact:last-child {
  border-bottom: 0;
}

.page-about .about-fact dt {
  font-size: 0.8125rem;
  letter-spacing: 0.08em;
  color: var(--c-muted);
}

.page-about .about-fact dd {
  margin: 0;
  font-size: 1.125rem;
  font-weight: 700;
  color: var(--c-warn);
  overflow-wrap: anywhere;
}

.page-about .about-fact dd span {
  margin-left: 0.2rem;
  font-size: 0.75rem;
  font-weight: 400;
  color: var(--c-muted);
}

/* ---------- 章节骨架 ---------- */
.page-about .about-section {
  padding-block: var(--about-gap);
  border-bottom: var(--about-rule);
}

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

.page-about .about-section__head {
  display: grid;
  row-gap: 0.75rem;
  margin-bottom: clamp(2rem, 5vw, 3.5rem);
}

.page-about .about-section__num {
  margin: 0;
  font-size: 0.8125rem;
  letter-spacing: 0.2em;
  color: var(--c-accent);
}

.page-about .about-section__head .cdx-h2 {
  margin: 0;
  font-family: var(--f-display);
  font-weight: 900;
  font-size: clamp(1.6rem, 3.6vw, 2.5rem);
  line-height: 1.2;
  letter-spacing: -0.01em;
  color: var(--c-chalk);
}

.page-about .about-section__lead {
  margin: 0;
  max-width: 38em;
  font-size: 1rem;
  line-height: 1.75;
  color: var(--c-muted);
}

.page-about .about-section__head .cdx-h3 {
  margin: 0 0 0.4rem;
}

/* ---------- 时间轴 ---------- */
.page-about .about-banner {
  margin: 0 0 clamp(2.5rem, 6vw, 4.5rem);
}

.page-about .about-banner .cdx-media {
  border: var(--about-rule);
}

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

.page-about .about-tl__item {
  position: relative;
  padding: 0 0 clamp(1.75rem, 4.5vw, 2.5rem) var(--about-rail);
  transition: transform var(--cdx-dur) var(--cdx-ease);
}

.page-about .about-tl__item::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.45rem;
  width: 12px;
  height: 12px;
  background: var(--c-night);
  border: 2px solid var(--c-accent-2);
  transition: border-color var(--cdx-dur) var(--cdx-ease), background-color var(--cdx-dur) var(--cdx-ease);
}

.page-about .about-tl__item::after {
  content: "";
  position: absolute;
  left: 5.5px;
  top: 1.9rem;
  bottom: 0;
  width: 1px;
  background: var(--c-line);
}

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

.page-about .about-tl__item:last-child::after {
  display: none;
}

.page-about .about-tl__item:hover {
  transform: translateY(-3px);
}

.page-about .about-tl__item:hover::before {
  background: var(--c-accent);
  border-color: var(--c-accent);
}

.page-about .about-tl__year {
  margin: 0 0 0.35rem;
  font-size: clamp(1.5rem, 5vw, 2rem);
  font-weight: 700;
  letter-spacing: -0.02em;
  color: var(--c-chalk);
  transition: color var(--cdx-dur) var(--cdx-ease);
}

.page-about .about-tl__item:hover .about-tl__year {
  color: var(--c-gold);
}

.page-about .about-tl__body .cdx-h3 {
  margin: 0 0 0.5rem;
  font-size: 1.125rem;
  color: var(--c-chalk);
}

.page-about .about-tl__body .cdx-text {
  margin: 0 0 0.6rem;
  color: var(--c-muted);
}

.page-about .about-tl__note {
  margin: 0;
  font-size: 0.75rem;
  letter-spacing: 0.06em;
  color: var(--c-accent-2);
}

.page-about .about-tl__item--now::before {
  background: var(--c-accent);
  border-color: var(--c-accent);
}

.page-about .about-tl__item--now .about-tl__year {
  color: var(--c-accent);
}

/* ---------- 双栏错位 ---------- */
.page-about .about-split {
  display: grid;
  gap: clamp(1.75rem, 5vw, 3rem);
  align-items: start;
}

.page-about .about-split__text p + p {
  margin-top: 1rem;
}

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

.page-about .about-split__media .cdx-media {
  border: var(--about-rule);
}

.page-about .cdx-figure__caption {
  margin-top: 0.75rem;
  font-size: 0.8125rem;
  line-height: 1.6;
  color: var(--c-muted);
}

/* ---------- 来源链 ---------- */
.page-about .about-chain {
  list-style: none;
  margin: 1.75rem 0 0;
  padding: 0;
  border-top: var(--about-rule);
}

.page-about .about-chain__step {
  display: grid;
  grid-template-columns: 2.5rem minmax(0, 1fr);
  column-gap: 1rem;
  align-items: baseline;
  padding: 0.85rem 0;
  border-bottom: var(--about-rule);
}

.page-about .about-chain__n {
  font-size: 0.75rem;
  letter-spacing: 0.12em;
  color: var(--c-warn);
}

.page-about .about-chain__step p {
  margin: 0;
  font-size: 0.9375rem;
  line-height: 1.65;
  color: var(--c-chalk);
}

/* ---------- 校准刻度 ---------- */
.page-about .about-cal {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 1.5rem;
}

.page-about .about-cal__node {
  position: relative;
  padding-top: 1.5rem;
  border-top: 2px solid var(--c-turf);
  transition: border-color var(--cdx-dur) var(--cdx-ease);
}

.page-about .about-cal__node::before {
  content: "";
  position: absolute;
  top: -6px;
  left: 0;
  width: 10px;
  height: 10px;
  background: var(--c-accent-2);
  transition: background-color var(--cdx-dur) var(--cdx-ease);
}

.page-about .about-cal__node:hover {
  border-top-color: var(--c-accent);
}

.page-about .about-cal__node:hover::before {
  background: var(--c-accent);
}

.page-about .about-cal__idx {
  display: block;
  margin-bottom: 0.6rem;
  font-size: 0.75rem;
  letter-spacing: 0.16em;
  color: var(--c-gold);
}

.page-about .about-cal__node .cdx-h3 {
  margin: 0 0 0.5rem;
  font-size: 1.125rem;
  color: var(--c-chalk);
}

.page-about .about-cal__node .cdx-text {
  margin: 0;
  color: var(--c-muted);
}

.page-about .about-aside {
  margin: clamp(1.75rem, 4vw, 2.5rem) 0 0;
  padding: 0.95rem 1.15rem;
  border-left: 3px solid var(--c-gold);
  background: var(--c-stand);
  font-size: 0.9375rem;
  line-height: 1.75;
  color: var(--c-chalk);
}

/* ---------- 团队 ---------- */
.page-about .about-roles {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 1.25rem;
}

.page-about .about-roles__item {
  display: grid;
  grid-template-columns: 2rem minmax(0, 1fr);
  column-gap: 1rem;
  padding-bottom: 1.25rem;
  border-bottom: var(--about-rule);
  transition: border-color var(--cdx-dur) var(--cdx-ease);
}

.page-about .about-roles__item:hover {
  border-bottom-color: var(--c-accent-2);
}

.page-about .about-roles__idx {
  font-size: 0.8125rem;
  line-height: 1.9;
  color: var(--c-accent);
}

.page-about .about-roles__body .cdx-h3 {
  margin: 0 0 0.45rem;
  font-size: 1.0625rem;
  color: var(--c-chalk);
}

.page-about .about-roles__body .cdx-text {
  margin: 0;
  color: var(--c-muted);
}

.page-about .about-flow {
  list-style: none;
  margin: clamp(2rem, 5vw, 3rem) 0 0;
  padding: 1px;
  display: grid;
  gap: 1px;
  background: var(--c-line);
  border: var(--about-rule);
}

.page-about .about-flow li {
  background: var(--c-stand);
  padding: 1rem 1.15rem;
  font-size: 0.9375rem;
  line-height: 1.7;
  color: var(--c-chalk);
}

.page-about .about-flow li .cdx-mono {
  display: block;
  margin-bottom: 0.35rem;
  font-size: 0.75rem;
  letter-spacing: 0.16em;
  color: var(--c-accent);
}

/* ---------- 年鉴与合作 ---------- */
.page-about .about-partners {
  list-style: none;
  margin: 1.75rem 0 0;
  padding: 0;
  border-top: var(--about-rule);
}

.page-about .about-partners__item {
  padding: 0.9rem 0.9rem 0.9rem 1rem;
  border-bottom: var(--about-rule);
  border-left: 2px solid transparent;
  transition: border-left-color var(--cdx-dur) var(--cdx-ease), background-color var(--cdx-dur) var(--cdx-ease);
}

.page-about .about-partners__item:hover {
  border-left-color: var(--c-accent);
  background: rgba(43, 233, 200, 0.05);
}

.page-about .about-partners__item .cdx-h3 {
  margin: 0 0 0.3rem;
  font-size: 1rem;
  color: var(--c-chalk);
}

.page-about .about-partners__item p {
  margin: 0;
  font-size: 0.75rem;
  letter-spacing: 0.05em;
  line-height: 1.7;
  color: var(--c-muted);
}

/* ---------- 合作价值 ---------- */
.page-about .about-section--value {
  background: var(--c-stand);
}

.page-about .about-value {
  list-style: none;
  margin: 0;
  padding: 1px;
  display: grid;
  gap: 1px;
  background: var(--c-line);
  border: var(--about-rule);
}

.page-about .about-value__item {
  background: var(--c-night);
  padding: clamp(1.25rem, 3vw, 1.75rem);
  transition: background-color var(--cdx-dur) var(--cdx-ease);
}

.page-about .about-value__item:hover {
  background: #0E342A;
}

.page-about .about-value__n {
  display: block;
  margin-bottom: 0.85rem;
  font-size: 0.75rem;
  letter-spacing: 0.2em;
  color: var(--c-warn);
}

.page-about .about-value__item .cdx-h3 {
  margin: 0 0 0.6rem;
  font-size: 1.125rem;
  color: var(--c-chalk);
}

.page-about .about-value__item .cdx-text {
  margin: 0;
  color: var(--c-muted);
}

.page-about .about-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin-top: clamp(1.75rem, 4vw, 2.5rem);
}

/* ---------- 桌面增强 ---------- */
@media (min-width: 780px) {
  .page-about .about-cal {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 2rem;
  }

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

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

@media (min-width: 820px) {
  .page-about .about-tl__item {
    display: grid;
    grid-template-columns: 7.5rem minmax(0, 1fr);
    column-gap: 2rem;
    padding-left: var(--about-rail);
  }

  .page-about .about-tl__year {
    grid-column: 1;
    text-align: right;
  }

  .page-about .about-tl__body {
    grid-column: 2;
  }

  .page-about .about-roles {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 2rem;
  }
}

@media (min-width: 880px) {
  .page-about .about-split {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, 0.95fr);
    column-gap: clamp(2rem, 5vw, 4rem);
  }

  .page-about .about-split--reverse .about-split__media {
    grid-column: 1;
    grid-row: 1;
  }

  .page-about .about-split--reverse .about-split__text {
    grid-column: 2;
    grid-row: 1;
  }
}

@media (min-width: 900px) {
  .page-about .about-section__head {
    grid-template-columns: 6rem minmax(0, 1fr);
    column-gap: 2.5rem;
  }

  .page-about .about-section__num {
    grid-row: 1 / span 2;
    padding-top: 0.45rem;
  }

  .page-about .about-section__head > .cdx-h2,
  .page-about .about-section__head > .about-section__lead {
    grid-column: 2;
  }
}

@media (min-width: 940px) {
  .page-about .about-hero__stage {
    grid-template-columns: minmax(0, 1fr) 20rem;
    column-gap: 3rem;
    align-items: end;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-tl__item,
  .page-about .about-tl__item::before,
  .page-about .about-tl__year,
  .page-about .about-cal__node,
  .page-about .about-cal__node::before,
  .page-about .about-roles__item,
  .page-about .about-partners__item,
  .page-about .about-value__item {
    transition: none;
  }

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