.page-about {
  --ab-axis: 104px;
  --ab-line: 1px solid var(--edge);
}

.page-about .crumbs {
  padding-block: 18px 0;
}

/* ---------- 档案抬头 ---------- */
.page-about .ab-hero {
  position: relative;
  display: grid;
  gap: 26px;
  padding-block: 32px 44px;
}

.page-about .ab-kicker {
  margin: 0 0 14px;
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: 0.16em;
  color: var(--neon);
}

.page-about h1 {
  margin: 0;
  font-family: var(--sans);
  font-weight: 900;
  font-size: clamp(32px, 7.4vw, 56px);
  line-height: 1.1;
  letter-spacing: -0.02em;
  color: var(--white);
  max-width: 20em;
}

.page-about .ab-lede {
  margin: 20px 0 0;
  max-width: 40em;
  font-size: 16px;
  line-height: 1.85;
  color: var(--white);
  opacity: 0.82;
}

.page-about .ab-facts {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 1px;
  margin: 30px 0 0;
  padding: 0;
  border-top: var(--ab-line);
}

.page-about .ab-facts > div {
  padding: 16px 10px 0 0;
}

.page-about .ab-facts dt {
  margin: 0;
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--ash);
}

.page-about .ab-facts dd {
  margin: 8px 0 0;
  font-size: 17px;
  font-weight: 700;
  color: var(--white);
  line-height: 1.4;
}

.page-about .ab-facts dd.num {
  font-family: var(--mono);
  font-size: 26px;
  font-weight: 700;
  color: var(--neon);
  font-variant-numeric: tabular-nums;
}

.page-about .ab-hero__media {
  margin: 0;
  border: var(--ab-line);
  background: var(--carbon);
  box-shadow: 0 18px 40px -28px rgba(0, 0, 0, 0.9);
}

.page-about .ab-hero__media img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 14 / 10;
  object-fit: cover;
}

.page-about .ab-hero__media figcaption {
  padding: 10px 14px;
  border-top: var(--ab-line);
  font-family: var(--mono);
  font-size: 12px;
  line-height: 1.7;
  color: var(--ash);
}

.page-about .ab-vertical-note {
  display: none;
}

/* ---------- 赛季档案 ---------- */
.page-about .ab-archive {
  display: grid;
  gap: 22px;
}

.page-about .ab-axis-list {
  display: flex;
  gap: 8px;
  margin: 0;
  padding: 0 0 4px;
  list-style: none;
  overflow-x: auto;
  scrollbar-width: none;
}

.page-about .ab-axis-list::-webkit-scrollbar {
  display: none;
}

.page-about .ab-axis-list li {
  flex: 0 0 auto;
}

.page-about .ab-axis-list a {
  position: relative;
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 9px 12px;
  border: var(--ab-line);
  background: var(--carbon);
  color: var(--white);
  text-decoration: none;
  font-size: 13px;
  line-height: 1;
  transition: border-color 0.22s var(--ease), color 0.22s var(--ease);
}

.page-about .ab-axis-list a:hover,
.page-about .ab-axis-list a:focus-visible {
  border-color: var(--neon);
  color: var(--neon);
}

.page-about .ab-axis-num {
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--neon);
}

.page-about .ab-season {
  padding: 22px 0;
  border-top: var(--ab-line);
  scroll-margin-top: 90px;
}

.page-about .ab-seasons .ab-season:last-child {
  border-bottom: var(--ab-line);
}

.page-about .ab-season h3 {
  margin: 0 0 12px;
  font-size: 22px;
  font-weight: 900;
  line-height: 1.35;
  color: var(--white);
  letter-spacing: -0.01em;
}

.page-about .ab-season-num {
  display: inline-block;
  margin-right: 10px;
  font-family: var(--mono);
  font-size: 14px;
  font-weight: 400;
  letter-spacing: 0.08em;
  color: var(--violet);
  vertical-align: 2px;
}

.page-about .ab-season p {
  margin: 0;
  max-width: 66ch;
  font-size: 16px;
  line-height: 1.85;
  color: var(--white);
  opacity: 0.78;
}

.page-about .ab-season__data {
  margin-top: 16px;
  padding: 14px 16px;
  background: var(--carbon);
  border-left: 2px solid var(--neon);
}

.page-about .ab-data-label {
  margin: 0;
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: 0.12em;
  color: var(--ash);
  opacity: 1;
}

.page-about .ab-data-value {
  margin: 8px 0 0;
  font-family: var(--mono);
  font-size: 22px;
  font-weight: 700;
  color: var(--neon);
  font-variant-numeric: tabular-nums;
  opacity: 1;
}

.page-about .ab-data-note {
  margin: 6px 0 0;
  font-size: 13px;
  line-height: 1.6;
  color: var(--ash);
  opacity: 1;
}

/* ---------- 编队室 ---------- */
.page-about .ab-crew-lede {
  margin: 0 0 26px;
  max-width: 66ch;
  font-size: 16px;
  line-height: 1.85;
  color: var(--white);
  opacity: 0.82;
}

.page-about .ab-crew__fig {
  margin: 0 0 26px;
  padding: 20px 12px 8px;
  background:
    radial-gradient(120% 90% at 50% 0%, rgba(123, 92, 255, 0.16), transparent 62%),
    var(--carbon);
  border: var(--ab-line);
}

.page-about .ab-tree {
  display: block;
  width: 100%;
  height: auto;
}

.page-about .ab-tree__links path {
  fill: none;
  stroke: var(--edge);
  stroke-width: 1.4;
}

.page-about .ab-tree__hub circle {
  fill: var(--ink);
  stroke: var(--neon);
  stroke-width: 1.5;
}

.page-about .ab-tree__hubnum {
  font-family: var(--mono);
  font-size: 26px;
  font-weight: 700;
  fill: var(--neon);
}

.page-about .ab-tree__hublabel {
  font-family: var(--sans);
  font-size: 12px;
  fill: var(--ash);
}

.page-about .ab-tree__node circle {
  fill: var(--ink);
  stroke: var(--violet);
  stroke-width: 1.4;
  transition: stroke 0.22s var(--ease), fill 0.22s var(--ease);
}

.page-about .ab-tree__node:hover circle,
.page-about .ab-tree__node:focus-within circle {
  stroke: var(--neon);
  fill: var(--green-ink);
}

.page-about .ab-tree__num {
  font-family: var(--mono);
  font-size: 24px;
  font-weight: 700;
  fill: var(--white);
  font-variant-numeric: tabular-nums;
}

.page-about .ab-tree__label {
  font-family: var(--sans);
  font-size: 14px;
  fill: var(--ash);
}

.page-about .ab-crew__fig figcaption {
  margin-top: 6px;
  padding-top: 12px;
  border-top: var(--ab-line);
  font-family: var(--mono);
  font-size: 12px;
  line-height: 1.7;
  color: var(--ash);
}

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

.page-about .ab-crew__list li {
  padding: 16px 18px;
  background: var(--ink);
  font-size: 15px;
  line-height: 1.8;
  color: var(--white);
  opacity: 0.82;
}

.page-about .ab-crew__k {
  display: inline-block;
  margin-right: 10px;
  padding: 2px 8px;
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--neon);
  border: 1px solid var(--edge);
  opacity: 1;
}

/* ---------- 校对流程 ---------- */
.page-about .ab-check {
  display: grid;
  gap: 1px;
  background: var(--edge);
  border-top: 2px solid var(--amber);
}

.page-about .ab-check__step {
  position: relative;
  padding: 24px 20px 26px;
  background: var(--carbon);
}

.page-about .ab-check__idx {
  margin: 0 0 10px;
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--amber);
}

.page-about .ab-check__step h3 {
  margin: 0 0 12px;
  font-size: 20px;
  font-weight: 900;
  color: var(--white);
  line-height: 1.4;
}

.page-about .ab-check__step p {
  margin: 0;
  font-size: 15px;
  line-height: 1.85;
  color: var(--white);
  opacity: 0.76;
}

.page-about .ab-media {
  margin: 28px 0 0;
  border: var(--ab-line);
  background: var(--ink);
}

.page-about .ab-media img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 2 / 1;
  object-fit: cover;
}

.page-about .ab-media figcaption {
  padding: 10px 14px;
  border-top: var(--ab-line);
  font-family: var(--mono);
  font-size: 12px;
  line-height: 1.7;
  color: var(--ash);
}

.page-about .ab-caliber {
  margin-top: 28px;
  padding: 24px 20px;
  background: var(--violet-ink);
  border-left: 2px solid var(--violet);
}

.page-about .ab-caliber__title {
  margin: 0 0 14px;
  font-size: 20px;
  font-weight: 900;
  color: var(--white);
  line-height: 1.4;
}

.page-about .ab-caliber p {
  margin: 0 0 12px;
  max-width: 66ch;
  font-size: 15px;
  line-height: 1.85;
  color: var(--white);
  opacity: 0.8;
}

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

.page-about .ab-caliber a {
  color: var(--neon);
  text-decoration: none;
  border-bottom: 1px solid rgba(61, 255, 162, 0.36);
}

.page-about .ab-caliber a:hover,
.page-about .ab-caliber a:focus-visible {
  border-bottom-color: var(--neon);
}

/* ---------- 版本记录 ---------- */
.page-about .ab-ver-lede {
  margin: 0 0 24px;
  max-width: 66ch;
  font-size: 16px;
  line-height: 1.85;
  color: var(--white);
  opacity: 0.82;
}

.page-about .ab-ver-lede a {
  color: var(--neon);
  text-decoration: none;
  border-bottom: 1px solid rgba(61, 255, 162, 0.36);
}

.page-about .ab-vers {
  display: grid;
  gap: 10px;
}

.page-about .ab-ver {
  border: var(--ab-line);
  background: var(--carbon);
  transition: border-color 0.22s var(--ease);
}

.page-about .ab-ver[open] {
  border-color: rgba(61, 255, 162, 0.42);
}

.page-about .ab-ver summary {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 8px 14px;
  padding: 16px 18px;
  cursor: pointer;
  list-style: none;
}

.page-about .ab-ver summary::-webkit-details-marker {
  display: none;
}

.page-about .ab-ver__range {
  font-family: var(--mono);
  font-size: 13px;
  letter-spacing: 0.06em;
  color: var(--violet);
  font-variant-numeric: tabular-nums;
}

.page-about .ab-ver[open] .ab-ver__range {
  color: var(--neon);
}

.page-about .ab-ver__title {
  font-size: 17px;
  font-weight: 700;
  color: var(--white);
}

.page-about .ab-ver__count {
  margin-left: auto;
  font-family: var(--mono);
  font-size: 12px;
  color: var(--ash);
  font-variant-numeric: tabular-nums;
}

.page-about .ab-ver .acc-body ul {
  margin: 0;
  padding: 0 18px 18px;
  list-style: none;
}

.page-about .ab-ver .acc-body li {
  position: relative;
  padding: 9px 0 9px 18px;
  border-top: var(--ab-line);
  font-size: 15px;
  line-height: 1.8;
  color: var(--white);
  opacity: 0.78;
}

.page-about .ab-ver .acc-body li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 19px;
  width: 6px;
  height: 6px;
  background: var(--violet);
}

/* ---------- 合作与来源 ---------- */
.page-about .ab-partner {
  display: grid;
  gap: 26px;
}

.page-about .ab-partner__body p {
  margin: 0 0 14px;
  max-width: 66ch;
  font-size: 16px;
  line-height: 1.85;
  color: var(--white);
  opacity: 0.8;
}

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

.page-about .ab-partner__body a {
  color: var(--neon);
  text-decoration: none;
  border-bottom: 1px solid rgba(61, 255, 162, 0.36);
}

.page-about .ab-partner__body a:hover,
.page-about .ab-partner__body a:focus-visible {
  border-bottom-color: var(--neon);
}

.page-about .ab-partner__fig {
  margin: 0;
  border: var(--ab-line);
  background: var(--carbon);
}

.page-about .ab-partner__fig img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 4 / 3;
  object-fit: cover;
}

.page-about .ab-partner__fig figcaption {
  padding: 10px 14px;
  border-top: var(--ab-line);
  font-family: var(--mono);
  font-size: 12px;
  line-height: 1.7;
  color: var(--ash);
}

/* ---------- 出口 ---------- */
.page-about .ab-next {
  display: grid;
  gap: 22px;
  padding: 26px 22px;
  background:
    radial-gradient(130% 120% at 0% 0%, rgba(61, 255, 162, 0.14), transparent 58%),
    var(--green-ink);
  border: 1px solid rgba(61, 255, 162, 0.28);
}

.page-about .ab-next__copy h2 {
  margin: 0 0 10px;
  font-size: clamp(22px, 4.4vw, 30px);
  font-weight: 900;
  line-height: 1.3;
  color: var(--white);
  letter-spacing: -0.01em;
}

.page-about .ab-next__copy p {
  margin: 0;
  max-width: 54ch;
  font-size: 15px;
  line-height: 1.8;
  color: var(--white);
  opacity: 0.78;
}

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

/* ---------- 平板及以上 ---------- */
@media (min-width: 700px) {
  .page-about .ab-check {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

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

  .page-about .ab-next {
    grid-template-columns: minmax(0, 1.4fr) minmax(0, 1fr);
    align-items: center;
    padding: 32px 30px;
  }

  .page-about .ab-next__acts {
    justify-content: flex-end;
  }
}

/* ---------- 桌面端 ---------- */
@media (min-width: 960px) {
  .page-about .ab-hero {
    grid-template-columns: minmax(0, 1.12fr) minmax(0, 0.88fr);
    gap: 48px;
    align-items: end;
    padding-block: 52px 76px;
  }

  .page-about .ab-hero__media {
    border-left: 1px solid var(--edge);
  }

  .page-about .ab-partner {
    grid-template-columns: minmax(0, 1.35fr) minmax(0, 1fr);
    gap: 44px;
    align-items: start;
  }
}

@media (min-width: 1024px) {
  .page-about .ab-archive {
    grid-template-columns: var(--ab-axis) minmax(0, 1fr);
    gap: 48px;
  }

  .page-about .ab-axis {
    position: sticky;
    top: 40px;
    align-self: start;
  }

  .page-about .ab-axis-list {
    flex-direction: column;
    gap: 0;
    padding: 0;
    overflow: visible;
    position: relative;
  }

  .page-about .ab-axis-list::before {
    content: "";
    position: absolute;
    left: 5px;
    top: 14px;
    bottom: 14px;
    width: 1px;
    background: linear-gradient(180deg, var(--neon), var(--violet) 70%, transparent);
  }

  .page-about .ab-axis-list a {
    display: block;
    padding: 13px 0 13px 26px;
    border: 0;
    background: none;
  }

  .page-about .ab-axis-list a::before {
    content: "";
    position: absolute;
    left: 1px;
    top: 50%;
    transform: translateY(-50%);
    width: 9px;
    height: 9px;
    border-radius: 50%;
    background: var(--ink);
    border: 1px solid var(--violet);
    transition: border-color 0.22s var(--ease), background 0.22s var(--ease);
  }

  .page-about .ab-axis-list a:hover::before,
  .page-about .ab-axis-list a:focus-visible::before {
    border-color: var(--neon);
    background: var(--neon);
  }

  .page-about .ab-axis-num {
    display: block;
    margin-bottom: 4px;
  }

  .page-about .ab-axis-label {
    display: block;
    font-size: 14px;
    color: var(--white);
  }

  .page-about .ab-season {
    display: grid;
    grid-template-columns: minmax(0, 1fr) 200px;
    gap: 38px;
    align-items: start;
    padding: 28px 0;
  }

  .page-about .ab-season:nth-child(even) {
    grid-template-columns: 200px minmax(0, 1fr);
  }

  .page-about .ab-season:nth-child(even) > .ab-season__body {
    grid-column: 2;
    grid-row: 1;
  }

  .page-about .ab-season:nth-child(even) > .ab-season__data {
    grid-column: 1;
    grid-row: 1;
  }

  .page-about .ab-season__data {
    margin-top: 0;
  }

  .page-about .ab-vertical-note {
    display: block;
    position: absolute;
    top: 56px;
    right: 0;
    writing-mode: vertical-rl;
    font-family: var(--mono);
    font-size: 12px;
    letter-spacing: 0.18em;
    color: var(--ash);
  }
}