.page-about {
  --about-slant: clamp(22px, 3.2vw, 46px);
  --about-rule: var(--line);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  overflow: hidden;
  padding: clamp(28px, 5vw, 48px) 0 clamp(64px, 8vw, 104px);
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  right: -18%;
  bottom: -22%;
  width: 72%;
  height: 96%;
  background: linear-gradient(140deg, rgba(228, 50, 43, 0.3), rgba(255, 138, 31, 0.04) 62%, transparent);
  transform: rotate(-9deg);
  pointer-events: none;
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 2px;
  background: linear-gradient(180deg, var(--red), var(--orange) 46%, transparent);
  pointer-events: none;
}

.page-about .about-hero__crumb {
  position: relative;
  margin-bottom: clamp(28px, 5vw, 56px);
}

.page-about .about-hero__grid {
  position: relative;
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(36px, 6vw, 72px);
}

.page-about .about-hero__title {
  margin: 12px 0 22px;
  font-size: clamp(34px, 8.4vw, 92px);
  font-weight: 300;
  line-height: 1.05;
  letter-spacing: -0.02em;
  color: var(--paper);
}

.page-about .about-hero__lede {
  max-width: 46ch;
  color: var(--muted);
}

.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 28px;
}

.page-about .about-hero__index {
  border-top: 1px solid var(--line);
  padding-top: 18px;
}

.page-about .about-hero__index-title {
  margin: 0 0 14px;
  font-size: 12px;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--orange);
}

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

.page-about .about-index__row {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 18px;
  padding: 11px 0;
  border-bottom: 1px solid var(--line-soft);
}

.page-about .about-index__k {
  font-size: 13px;
  letter-spacing: 0.06em;
  color: var(--muted);
}

.page-about .about-index__v {
  font-size: 19px;
  font-weight: 700;
  color: var(--paper);
}

/* ---------- 通用章节标题 ---------- */
.page-about .about-head {
  margin-bottom: clamp(34px, 5vw, 58px);
}

.page-about .about-h2 {
  font-size: clamp(26px, 4.6vw, 44px);
  font-weight: 300;
  line-height: 1.2;
  letter-spacing: -0.01em;
  color: var(--paper);
}

.page-about .about-h2--ink {
  color: var(--graphite);
}

.page-about .about-head__intro {
  max-width: 58ch;
  margin-top: 18px;
  font-size: 17px;
  line-height: 1.75;
  color: var(--muted);
}

.page-about .about-head__intro--ink {
  color: #4A5262;
}

.page-about .about-head--split {
  display: grid;
  grid-template-columns: 1fr;
  gap: 20px;
}

.page-about .about-head__side {
  max-width: 46ch;
  font-size: 16px;
  line-height: 1.75;
  color: var(--muted);
  align-self: end;
}

/* ---------- 时间线 ---------- */
.page-about .about-timeline {
  padding: clamp(56px, 8vw, 108px) 0 clamp(48px, 7vw, 96px);
}

.page-about .timeline {
  list-style: none;
  margin: 0;
  padding: 0 0 0 26px;
  border-left: 1px solid var(--line);
}

.page-about .timeline__item {
  position: relative;
  padding: 0 0 clamp(34px, 5vw, 56px);
}

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

.page-about .timeline__node {
  position: absolute;
  left: -32px;
  top: 8px;
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--ink);
  border: 1px solid var(--neon);
  transition: background var(--dur) var(--ease), box-shadow var(--dur) var(--ease);
}

.page-about .timeline__body {
  transition: transform var(--dur) var(--ease);
}

.page-about .timeline__stage {
  margin: 0 0 6px;
  font-size: 12px;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--orange);
}

.page-about .timeline__title {
  margin: 0 0 10px;
  font-size: clamp(19px, 2.4vw, 24px);
  font-weight: 500;
  line-height: 1.35;
  color: var(--paper);
}

.page-about .timeline__text {
  max-width: 62ch;
  margin: 0;
  font-size: 16px;
  line-height: 1.78;
  color: var(--muted);
}

.page-about .timeline__item:hover .timeline__body,
.page-about .timeline__item:focus-within .timeline__body {
  transform: translateX(6px);
}

.page-about .timeline__item:hover .timeline__node,
.page-about .timeline__item:focus-within .timeline__node {
  background: var(--neon);
  box-shadow: 0 0 0 4px rgba(184, 255, 60, 0.16);
}

.page-about .about-timeline__media {
  margin: clamp(34px, 5vw, 56px) 0;
}

.page-about .about-timeline__media .media__caption {
  color: var(--muted);
}

.page-about .timeline--tail {
  border-left-color: var(--line);
}

/* ---------- 内容生产 ---------- */
.page-about .about-produce {
  padding: clamp(56px, 8vw, 104px) 0;
}

.page-about .about-produce__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(30px, 5vw, 64px);
  align-items: start;
}

.page-about .about-produce__text .prose {
  margin-top: 18px;
  color: var(--muted);
}

.page-about .about-series {
  list-style: none;
  margin: 26px 0 0;
  padding: 0;
}

.page-about .about-series__item {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 10px 14px;
  padding: 14px 0;
  border-top: 1px solid var(--line-soft);
}

.page-about .about-series__item:last-child {
  border-bottom: 1px solid var(--line-soft);
}

.page-about .about-series__name {
  font-size: 16px;
  font-weight: 500;
  color: var(--paper);
}

.page-about .about-series__desc {
  flex: 1 1 220px;
  font-size: 14px;
  line-height: 1.7;
  color: var(--muted);
}

.page-about .about-produce__note {
  margin-top: 22px;
  padding-left: 14px;
  border-left: 2px solid var(--neon);
  font-size: 14px;
  line-height: 1.8;
  color: var(--muted);
}

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

.page-about .media__img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
  border-radius: var(--radius);
}

.page-about .media__caption {
  margin-top: 10px;
  font-size: 12.5px;
  line-height: 1.6;
  letter-spacing: 0.02em;
  color: var(--muted);
}

/* ---------- 数据覆盖 ---------- */
.page-about .about-data {
  padding: clamp(56px, 8vw, 104px) 0;
}

.page-about .about-data__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(30px, 5vw, 56px);
}

.page-about .about-data__stats {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1px;
  background: var(--line-soft);
  border: 1px solid var(--line-soft);
}

.page-about .about-data__stats .stat {
  background: var(--ink);
  padding: 20px 18px;
}

.page-about .about-data__table-title {
  margin: 0 0 14px;
  font-size: 12px;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--orange);
}

.page-about .about-table__scroll {
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
}

.page-about .about-table {
  width: 100%;
  min-width: 460px;
}

.page-about .about-table__caption {
  caption-side: bottom;
  padding-top: 10px;
  text-align: left;
  font-size: 12.5px;
  line-height: 1.6;
  color: var(--muted);
}

.page-about .about-data__more {
  margin: 18px 0 0;
  font-size: 14px;
  line-height: 1.75;
  color: var(--muted);
}

.page-about .about-link {
  color: var(--neon);
  border-bottom: 1px solid rgba(184, 255, 60, 0.4);
  transition: border-color var(--dur) var(--ease), color var(--dur) var(--ease);
}

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

/* ---------- 协作网络 ---------- */
.page-about .about-net {
  padding: clamp(56px, 8vw, 104px) 0;
}

.page-about .about-net__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(30px, 5vw, 60px);
  align-items: start;
}

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

.page-about .about-net__text .prose {
  margin-top: 18px;
  color: var(--muted);
}

.page-about .about-net__points {
  list-style: none;
  margin: 28px 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: 1fr;
  gap: 1px;
  background: var(--line-soft);
  border: 1px solid var(--line-soft);
}

.page-about .about-net__point {
  background: var(--ink-2);
  padding: 16px 18px;
  display: flex;
  align-items: baseline;
  gap: 14px;
}

.page-about .about-net__num {
  font-size: 26px;
  font-weight: 700;
  color: var(--neon);
  min-width: 4.5ch;
}

.page-about .about-net__label {
  font-size: 14px;
  line-height: 1.6;
  color: var(--muted);
}

/* ---------- 暖纸分区 ---------- */
.page-about .about-paper {
  position: relative;
  background: var(--paper);
  color: var(--graphite);
  padding: clamp(64px, 9vw, 128px) 0 clamp(56px, 8vw, 104px);
}

.page-about .about-paper::before {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  top: calc(-1 * var(--about-slant));
  height: var(--about-slant);
  background: var(--paper);
  clip-path: polygon(0 100%, 100% 0, 100% 100%);
}

.page-about .about-paper .eyebrow {
  color: var(--red);
}

.page-about .about-prose--ink {
  color: #4A5262;
}

.page-about .team-bars {
  list-style: none;
  margin: 0 0 8px;
  padding: 0;
}

.page-about .team-bar {
  padding: 16px 0;
  border-top: 1px solid rgba(20, 24, 31, 0.14);
  outline: none;
}

.page-about .team-bar:last-child {
  border-bottom: 1px solid rgba(20, 24, 31, 0.14);
}

.page-about .team-bar__row {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  justify-content: space-between;
  gap: 8px 18px;
  margin-bottom: 10px;
}

.page-about .team-bar__label {
  font-size: 16px;
  font-weight: 500;
  color: var(--graphite);
}

.page-about .team-bar__value {
  font-size: 15px;
  font-weight: 700;
  color: var(--red);
}

.page-about .team-bar__track {
  height: 4px;
  background: rgba(20, 24, 31, 0.1);
  border-radius: var(--radius-sm);
  overflow: hidden;
}

.page-about .team-bar__fill {
  display: block;
  height: 100%;
  background: var(--graphite);
  transition: background var(--dur) var(--ease);
}

.page-about .team-bar__fill--a { width: 61%; }
.page-about .team-bar__fill--b { width: 18%; }
.page-about .team-bar__fill--c { width: 13%; }
.page-about .team-bar__fill--d { width: 8%; }

.page-about .team-bar__note {
  margin: 10px 0 0;
  font-size: 13.5px;
  line-height: 1.7;
  color: #6B7382;
  transition: color var(--dur) var(--ease);
}

.page-about .team-bar:hover .team-bar__fill,
.page-about .team-bar:focus-visible .team-bar__fill {
  background: var(--red);
}

.page-about .team-bar:hover .team-bar__note,
.page-about .team-bar:focus-visible .team-bar__note {
  color: var(--graphite);
}

.page-about .team-bar:focus-visible {
  box-shadow: 0 0 0 2px var(--red);
  border-radius: var(--radius-sm);
}

.page-about .about-paper__rule {
  margin: clamp(40px, 6vw, 72px) 0;
  border: 0;
  border-top: 1px solid rgba(20, 24, 31, 0.16);
}

.page-about .about-partner {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(28px, 5vw, 56px);
  align-items: start;
}

.page-about .about-partner__intro .prose {
  margin-top: 18px;
}

.page-about .about-archive {
  list-style: none;
  margin: 0;
  padding: 0;
  border-top: 1px solid rgba(20, 24, 31, 0.16);
}

.page-about .about-archive__item {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  justify-content: space-between;
  gap: 6px 20px;
  padding: 13px 0;
  border-bottom: 1px solid rgba(20, 24, 31, 0.1);
}

.page-about .about-archive__key {
  font-size: 13px;
  letter-spacing: 0.06em;
  color: #6B7382;
}

.page-about .about-archive__val {
  font-size: 14.5px;
  font-weight: 500;
  color: var(--graphite);
  text-align: right;
}

.page-about .about-next {
  margin-top: clamp(40px, 6vw, 72px);
  padding-top: 24px;
  border-top: 2px solid var(--red);
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 18px;
}

.page-about .about-next__text {
  margin: 0;
  max-width: 48ch;
  font-size: 15px;
  line-height: 1.75;
  color: #4A5262;
}

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

/* ---------- 响应式 ---------- */
@media (min-width: 641px) {
  .page-about .about-data__stats {
    grid-template-columns: repeat(3, 1fr);
  }

  .page-about .about-net__points {
    grid-template-columns: 1fr;
  }
}

@media (min-width: 961px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 1.55fr) minmax(260px, 0.85fr);
    align-items: end;
  }

  .page-about .about-hero__index {
    padding-top: 22px;
  }

  .page-about .about-head--split {
    grid-template-columns: minmax(0, 1.3fr) minmax(0, 1fr);
    gap: 48px;
    align-items: end;
  }

  .page-about .timeline {
    padding-left: 42px;
  }

  .page-about .timeline__node {
    left: -48px;
    top: 10px;
    width: 11px;
    height: 11px;
  }

  .page-about .about-produce__grid {
    grid-template-columns: minmax(0, 1fr) minmax(0, 0.85fr);
  }

  .page-about .about-data__grid {
    grid-template-columns: minmax(0, 0.95fr) minmax(0, 1.25fr);
    gap: 56px;
  }

  .page-about .about-net__grid {
    grid-template-columns: minmax(0, 0.72fr) minmax(0, 1.2fr);
  }

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

  .page-about .about-partner {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1.1fr);
    gap: 64px;
  }
}

@media (min-width: 1201px) {
  .page-about .about-hero__title {
    letter-spacing: -0.03em;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .timeline__body,
  .page-about .timeline__node,
  .page-about .team-bar__fill,
  .page-about .about-link {
    transition: none;
  }

  .page-about .timeline__item:hover .timeline__body,
  .page-about .timeline__item:focus-within .timeline__body {
    transform: none;
  }
}