.page-about {
  --about-rail: 220px;
  background: var(--night-green);
  color: var(--paper);
  font-family: var(--font-body);
}

/* ---------- 面包屑 ---------- */
.page-about .about-crumb {
  padding-top: clamp(18px, 3.5vw, 36px);
}
.page-about .about-crumb__sep {
  margin: 0 .55em;
  color: var(--line);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  padding: clamp(24px, 4vw, 48px) 0 clamp(56px, 9vw, 112px);
  overflow: hidden;
}
.page-about .about-hero::before {
  content: "";
  position: absolute;
  top: -18vw;
  right: -12vw;
  width: 52vw;
  height: 52vw;
  background: radial-gradient(circle, var(--fluoro-ghost), transparent 66%);
  pointer-events: none;
}
.page-about .about-hero__grid {
  position: relative;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(22px, 4vw, 36px);
}
.page-about .about-hero__eyebrow {
  color: var(--fluoro);
}
.page-about .about-hero__title {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 900;
  font-stretch: 88%;
  font-size: clamp(38px, 8.4vw, 96px);
  line-height: .96;
  letter-spacing: -.02em;
  color: var(--paper);
}
.page-about .about-hero__aside .lede {
  margin: 0;
  font-size: clamp(15px, 1.7vw, 17px);
  line-height: 1.78;
  color: var(--paper);
  max-width: 32em;
}
.page-about .about-hero__facts {
  display: grid;
  gap: 12px;
  margin: 28px 0 0;
  padding-top: 20px;
  border-top: 1px solid var(--line-soft);
}
.page-about .about-hero__facts > div {
  display: grid;
  grid-template-columns: 68px minmax(0, 1fr);
  gap: 12px;
  align-items: baseline;
}
.page-about .about-hero__facts dt {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .14em;
  color: var(--muted);
}
.page-about .about-hero__facts dd {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 14px;
  font-variant-numeric: tabular-nums;
  color: var(--paper);
}

@media (min-width: 900px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 1.45fr) minmax(0, .85fr);
    column-gap: clamp(32px, 5vw, 72px);
    align-items: end;
  }
  .page-about .about-hero__eyebrow {
    grid-column: 1 / -1;
  }
  .page-about .about-hero__title {
    grid-column: 1;
  }
  .page-about .about-hero__aside {
    grid-column: 2;
    padding-bottom: 6px;
  }
}

/* ---------- 长卷骨架：左索引 + 右正文 ---------- */
.page-about .about-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(20px, 4vw, 40px);
  padding-bottom: clamp(56px, 9vw, 104px);
}
.page-about .about-rail {
  display: flex;
  gap: 4px;
  overflow-x: auto;
  padding-bottom: 6px;
  scrollbar-width: none;
}
.page-about .about-rail::-webkit-scrollbar {
  display: none;
}
.page-about .about-rail__label {
  display: none;
  margin: 0 0 14px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .14em;
  color: var(--muted);
}
.page-about .about-rail__list {
  list-style: none;
  display: flex;
  gap: 4px;
  margin: 0;
  padding: 0;
}
.page-about .about-rail__list a {
  display: flex;
  align-items: baseline;
  gap: 9px;
  padding: 8px 10px;
  border: 1px solid transparent;
  color: var(--muted);
  font-size: 14px;
  text-decoration: none;
  white-space: nowrap;
  transition: color var(--step) linear, border-color var(--step) linear;
}
.page-about .about-rail__list a:hover,
.page-about .about-rail__list a:focus-visible {
  color: var(--paper);
  border-color: var(--line-soft);
  outline: none;
}
.page-about .about-rail__no {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .1em;
  transition: color var(--step) linear;
}
.page-about .about-rail__list a:hover .about-rail__no,
.page-about .about-rail__list a:focus-visible .about-rail__no {
  color: var(--fluoro);
}

@media (min-width: 960px) {
  .page-about .about-layout {
    grid-template-columns: var(--about-rail) minmax(0, 1fr);
    column-gap: clamp(40px, 6vw, 88px);
  }
  .page-about .about-rail {
    display: block;
    overflow: visible;
    padding: 0;
    position: sticky;
    top: calc(var(--header-h) + 32px);
    align-self: start;
  }
  .page-about .about-rail__label {
    display: block;
  }
  .page-about .about-rail__list {
    display: block;
  }
  .page-about .about-rail__list li + li {
    margin-top: 2px;
  }
}

/* ---------- 贯穿竖线 ---------- */
.page-about .about-flow {
  position: relative;
}
@media (min-width: 768px) {
  .page-about .about-flow {
    padding-left: clamp(22px, 3vw, 44px);
  }
  .page-about .about-flow::before {
    content: "";
    position: absolute;
    left: 0;
    top: 6px;
    bottom: 6px;
    width: 1px;
    background: linear-gradient(180deg, transparent, var(--line-soft) 4%, var(--line-soft) 96%, transparent);
  }
}

/* ---------- 章节通用 ---------- */
.page-about .about-sec {
  padding: clamp(40px, 7vw, 80px) 0;
}
.page-about .about-sec:first-child {
  padding-top: 0;
}
.page-about .about-sec + .about-sec {
  border-top: 1px solid var(--line-soft);
}
.page-about .about-sec__no {
  margin: 0 0 14px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .16em;
  color: var(--fluoro);
}
.page-about .about-sec__title {
  margin: 0 0 clamp(18px, 3vw, 28px);
  font-family: var(--font-display);
  font-weight: 900;
  font-stretch: 88%;
  font-size: clamp(26px, 4.2vw, 46px);
  line-height: 1.08;
  letter-spacing: -.01em;
  color: var(--paper);
}
.page-about .about-prose {
  max-width: 34em;
}
.page-about .about-prose--tight {
  margin-top: clamp(22px, 3.5vw, 32px);
}
.page-about .about-prose p {
  margin: 0 0 1.1em;
  font-size: clamp(15px, 1.6vw, 17px);
  line-height: 1.78;
  color: var(--paper);
}
.page-about .about-prose p:last-child {
  margin-bottom: 0;
}
.page-about .about-prose a {
  color: var(--fluoro);
  text-decoration: none;
  border-bottom: 1px solid var(--line-hard);
}
.page-about .about-prose a:hover {
  border-bottom-color: var(--fluoro);
}

.page-about .about-subhead {
  margin: clamp(32px, 5vw, 52px) 0 0;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .14em;
  color: var(--muted);
}

/* ---------- 图片 ---------- */
.page-about .about-fig {
  margin: clamp(24px, 4vw, 40px) 0 0;
  border: 1px solid var(--line-soft);
}
.page-about .about-fig img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
}
.page-about .about-fig .media__caption {
  padding: 12px 14px;
  border-top: 1px solid var(--line-soft);
  font-family: var(--font-mono);
  font-size: 12.5px;
  line-height: 1.7;
  color: var(--muted);
}

/* ---------- 数据章节：文图分栏 + 三条流程 ---------- */
.page-about .about-split {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(24px, 4vw, 40px);
  align-items: start;
}
.page-about .about-split .about-fig {
  margin-top: 0;
}
@media (min-width: 1080px) {
  .page-about .about-split {
    grid-template-columns: minmax(0, 1.08fr) minmax(0, .92fr);
    column-gap: clamp(32px, 4vw, 56px);
  }
}

.page-about .about-steps {
  list-style: none;
  margin: clamp(20px, 3vw, 28px) 0 0;
  padding: 0;
  border-top: 1px solid var(--line-soft);
}
.page-about .about-steps li {
  display: grid;
  grid-template-columns: 36px minmax(0, 1fr);
  gap: 16px;
  padding: clamp(18px, 3vw, 26px) 0;
  border-bottom: 1px solid var(--line-soft);
}
.page-about .about-steps__k {
  padding-top: 3px;
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: .1em;
  color: var(--data-blue);
}
.page-about .about-steps h3 {
  margin: 0 0 8px;
  font-size: clamp(16px, 2vw, 19px);
  font-weight: 700;
  color: var(--paper);
}
.page-about .about-steps p {
  margin: 0;
  max-width: 42em;
  font-size: 15px;
  line-height: 1.76;
  color: var(--muted);
}

/* ---------- 团队表格 ---------- */
.page-about .about-tableWrap {
  margin-top: clamp(24px, 4vw, 36px);
  overflow-x: auto;
  border: 1px solid var(--line-soft);
}
.page-about .about-table {
  width: 100%;
  min-width: 560px;
  border-collapse: collapse;
  font-size: 14.5px;
}
.page-about .about-table caption {
  padding: 12px 14px;
  text-align: left;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: .14em;
  color: var(--muted);
  border-bottom: 1px solid var(--line-soft);
}
.page-about .about-table th,
.page-about .about-table td {
  padding: 13px 14px;
  text-align: left;
  vertical-align: top;
  border-bottom: 1px solid var(--line-soft);
}
.page-about .about-table tbody tr:last-child th,
.page-about .about-table tbody tr:last-child td {
  border-bottom: 0;
}
.page-about .about-table thead th {
  font-family: var(--font-mono);
  font-size: 11.5px;
  font-weight: 400;
  letter-spacing: .12em;
  color: var(--data-blue);
  border-bottom-color: var(--line-hard);
}
.page-about .about-table tbody th {
  color: var(--paper);
  font-weight: 700;
  white-space: nowrap;
}
.page-about .about-table td {
  color: var(--muted);
}
.page-about .about-table td.num {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  color: var(--paper);
  white-space: nowrap;
}

/* ---------- 版本时间线 ---------- */
.page-about .about-fig--wide {
  margin-top: clamp(24px, 4vw, 36px);
}
.page-about .about-timeline {
  list-style: none;
  margin: clamp(28px, 4vw, 40px) 0 0;
  padding: 0;
}
.page-about .about-ver {
  display: grid;
  grid-template-columns: 52px minmax(0, 1fr);
  gap: 14px;
  padding: clamp(16px, 2.6vw, 22px) 0;
  border-top: 1px solid var(--line-soft);
}
.page-about .about-ver:last-child {
  border-bottom: 1px solid var(--line-soft);
}
.page-about .about-ver__badge {
  font-family: var(--font-mono);
  font-size: 15px;
  font-weight: 700;
  letter-spacing: .06em;
  color: var(--muted);
  transition: color var(--step) linear;
}
.page-about .about-ver__year {
  margin: 0 0 4px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: .12em;
  color: var(--data-blue);
}
.page-about .about-ver__name {
  margin: 0 0 6px;
  font-size: clamp(15px, 1.9vw, 18px);
  font-weight: 700;
  color: var(--paper);
}
.page-about .about-ver__desc {
  margin: 0;
  max-width: 46em;
  font-size: 14.5px;
  line-height: 1.74;
  color: var(--muted);
  transition: color var(--step) linear;
}
.page-about .about-ver__desc a {
  color: inherit;
  text-decoration: none;
  border-bottom: 1px solid var(--line-soft);
}
.page-about .about-ver:hover .about-ver__badge {
  color: var(--fluoro);
}
.page-about .about-ver:hover .about-ver__desc {
  color: var(--paper);
}
.page-about .about-ver:hover .about-ver__desc a {
  border-bottom-color: var(--fluoro);
}

/* ---------- 合作筛选与条目 ---------- */
.page-about .about-filter {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: clamp(20px, 3vw, 28px) 0 clamp(22px, 3.5vw, 30px);
}
.page-about .about-filter .chip {
  appearance: none;
  background: transparent;
  border: 1px solid var(--line-soft);
  border-radius: 0;
  padding: 7px 14px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .08em;
  color: var(--muted);
  cursor: pointer;
  transition: color var(--step) linear, border-color var(--step) linear, background-color var(--step) linear;
}
.page-about .about-filter .chip:hover {
  color: var(--paper);
  border-color: var(--line-hard);
}
.page-about .about-filter .chip:focus-visible {
  outline: 1px solid var(--fluoro);
  outline-offset: 2px;
}
.page-about .about-filter .chip[aria-pressed="true"] {
  background: var(--fluoro);
  border-color: var(--fluoro);
  color: var(--ink);
  font-weight: 700;
}

.page-about .about-orgs {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1px;
  background: var(--line-soft);
  border: 1px solid var(--line-soft);
}
@media (min-width: 760px) {
  .page-about .about-orgs {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}
.page-about .about-org {
  background: var(--night-green);
  padding: clamp(18px, 3vw, 28px);
  border-left: 3px solid transparent;
  transition: border-color var(--step) linear, background-color var(--step) linear;
}
.page-about .about-org:hover {
  border-left-color: var(--fluoro);
  background: var(--stand-green);
}
.page-about .about-org__type {
  margin: 0 0 12px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: .12em;
  color: var(--data-blue);
}
.page-about .about-org__count {
  margin: 0 0 6px;
  font-family: var(--font-mono);
  font-size: 22px;
  font-variant-numeric: tabular-nums;
  color: var(--fluoro);
}
.page-about .about-org__count .num {
  font-size: 30px;
  font-weight: 700;
}
.page-about .about-org__name {
  margin: 0 0 10px;
  font-size: clamp(15px, 1.8vw, 17px);
  font-weight: 700;
  line-height: 1.42;
  color: var(--paper);
}
.page-about .about-org__desc {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.74;
  color: var(--muted);
}

/* ---------- 纸白反色块 ---------- */
.page-about .about-creed {
  background: var(--paper);
  color: var(--ink);
  margin-top: clamp(24px, 5vw, 56px);
  padding: clamp(72px, 11vw, 128px) 0 clamp(56px, 8vw, 96px);
  clip-path: polygon(0 0, 100% 3vw, 100% 100%, 0 100%);
}
.page-about .about-creed__no {
  margin: 0 0 14px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .16em;
  color: var(--board-orange);
}
.page-about .about-creed__title {
  margin: 0 0 clamp(28px, 5vw, 48px);
  font-family: var(--font-display);
  font-weight: 900;
  font-stretch: 88%;
  font-size: clamp(28px, 4.6vw, 52px);
  line-height: 1.06;
  letter-spacing: -.01em;
  color: var(--ink);
}
.page-about .about-creed__list {
  list-style: none;
  display: grid;
  gap: 1px;
  margin: 0;
  padding: 0;
  background: rgba(5, 8, 10, .16);
  border-top: 1px solid rgba(5, 8, 10, .16);
  border-bottom: 1px solid rgba(5, 8, 10, .16);
}
@media (min-width: 860px) {
  .page-about .about-creed__list {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}
.page-about .about-creed__list li {
  background: var(--paper);
  padding: clamp(20px, 3vw, 32px) clamp(16px, 2.4vw, 28px);
}
.page-about .about-creed__idx {
  display: block;
  margin-bottom: 12px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .16em;
  color: var(--board-orange);
}
.page-about .about-creed__list h3 {
  margin: 0 0 10px;
  font-size: clamp(16px, 2vw, 20px);
  font-weight: 700;
  line-height: 1.36;
  color: var(--ink);
}
.page-about .about-creed__list p {
  margin: 0;
  font-size: 15px;
  line-height: 1.78;
  color: #3A4340;
}
.page-about .about-creed__slogan {
  margin: clamp(34px, 6vw, 60px) 0 0;
  padding-top: clamp(20px, 3vw, 32px);
  border-top: 1px solid rgba(5, 8, 10, .2);
  font-family: var(--font-display);
  font-weight: 900;
  font-stretch: 88%;
  font-size: clamp(22px, 3.4vw, 36px);
  letter-spacing: -.005em;
  color: var(--ink);
}

/* ---------- 窄屏收口 ---------- */
@media (max-width: 520px) {
  .page-about .about-hero__facts > div {
    grid-template-columns: 60px minmax(0, 1fr);
  }
  .page-about .about-ver {
    grid-template-columns: 40px minmax(0, 1fr);
    gap: 10px;
  }
  .page-about .about-steps li {
    grid-template-columns: 24px minmax(0, 1fr);
    gap: 12px;
  }
  .page-about .about-creed {
    clip-path: polygon(0 0, 100% 18px, 100% 100%, 0 100%);
  }
}