.page-about {
  --ab-rail: 118px;
  --ab-dotcol: 26px;
  --ab-ink: rgba(242, 246, 241, .82);
  --ab-ink-dim: rgba(242, 246, 241, .62);
  background: var(--ink-bg);
  color: var(--paper);
  overflow-x: hidden;
}

.page-about .num {
  font-family: var(--mono);
  font-weight: 700;
  letter-spacing: -.02em;
}

/* ---------- 首屏 ---------- */

.page-about .ab-cover {
  position: relative;
  padding: clamp(88px, 14vw, 152px) 0 clamp(48px, 6vw, 76px);
  border-bottom: 1px solid var(--line);
  background:
    radial-gradient(120% 92% at 10% -6%, rgba(23, 229, 184, .12), transparent 62%),
    radial-gradient(86% 74% at 92% 8%, rgba(89, 180, 255, .08), transparent 60%);
}

.page-about .ab-cover::before {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background-image:
    linear-gradient(rgba(147, 173, 166, .075) 1px, transparent 1px),
    linear-gradient(90deg, rgba(147, 173, 166, .075) 1px, transparent 1px);
  background-size: 96px 96px;
  mask-image: linear-gradient(180deg, #000 0%, rgba(0, 0, 0, .35) 78%, transparent 100%);
}

.page-about .ab-cover .shell {
  position: relative;
  z-index: 1;
}

.page-about .ab-kicker {
  margin: 26px 0 0;
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: .2em;
  text-transform: uppercase;
  color: var(--tactical);
}

.page-about .ab-title {
  margin: 16px 0 0;
  max-width: 22ch;
  font-size: clamp(30px, 5.6vw, 60px);
  line-height: 1.1;
  font-weight: 800;
  letter-spacing: -.02em;
}

.page-about .ab-lede {
  margin: 22px 0 0;
  max-width: 62ch;
  font-size: clamp(16px, 1.6vw, 18px);
  line-height: 1.75;
  color: var(--ab-ink);
}

.page-about .ab-facts {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin: clamp(34px, 5vw, 58px) 0 0;
  padding: 0;
  background: var(--line-soft);
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}

.page-about .ab-fact {
  background: var(--ink-bg);
  padding: 18px 16px 20px;
}

.page-about .ab-fact dt {
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: .16em;
  text-transform: uppercase;
  color: var(--moss);
}

.page-about .ab-fact dd {
  margin: 10px 0 0;
  font-family: var(--mono);
  font-size: clamp(24px, 3.4vw, 34px);
  font-weight: 700;
  letter-spacing: -.02em;
  color: var(--paper);
}

.page-about .ab-unit {
  margin-left: 5px;
  font-family: var(--sans);
  font-size: 13px;
  font-weight: 400;
  letter-spacing: 0;
  color: var(--moss);
}

/* ---------- 区块骨架 ---------- */

.page-about .ab-sec {
  padding: clamp(56px, 9vw, 112px) 0;
}

.page-about .ab-grid,
.page-about .ab-archive-grid {
  display: grid;
  gap: clamp(26px, 4vw, 54px);
}

.page-about .ab-sec-head h2 {
  margin: 12px 0 0;
  font-size: clamp(24px, 3.4vw, 40px);
  line-height: 1.2;
  font-weight: 800;
  letter-spacing: -.015em;
  max-width: 24ch;
}

.page-about .ab-sec-head--wide {
  max-width: 72ch;
}

.page-about .ab-lead {
  margin: 16px 0 0;
  max-width: 60ch;
  font-size: 16px;
  line-height: 1.75;
  color: var(--ab-ink);
}

.page-about .ab-sec-body p {
  margin: 0 0 1.1em;
  max-width: 64ch;
  font-size: 17px;
  line-height: 1.75;
  color: var(--ab-ink);
}

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

.page-about .ab-sec-body b {
  color: var(--paper);
  font-weight: 700;
}

.page-about .ab-note {
  font-size: 13px;
  color: var(--moss);
}

.page-about .ab-link {
  display: inline-block;
  padding-bottom: 2px;
  color: var(--tactical);
  text-decoration: none;
  border-bottom: 1px solid var(--line-tactical);
  transition: color .18s var(--ease), border-color .18s var(--ease);
}

.page-about .ab-link:hover,
.page-about .ab-link:focus-visible {
  color: var(--tactical-soft);
  border-color: var(--tactical-soft);
}

.page-about .ab-sec-body a:not(.ab-link) {
  color: var(--tactical);
  text-decoration: none;
  border-bottom: 1px solid var(--line-tactical);
}

.page-about .ab-sec-body a:not(.ab-link):hover,
.page-about .ab-sec-body a:not(.ab-link):focus-visible {
  color: var(--tactical-soft);
}

.page-about .ab-strip {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 26px 0 0;
  padding: 0;
  list-style: none;
}

.page-about .ab-strip li {
  padding: 7px 13px;
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: .12em;
  color: var(--print);
  background: rgba(230, 223, 201, .05);
  border: 1px solid rgba(230, 223, 201, .22);
  border-radius: var(--pill);
}

/* ---------- 时间轴 ---------- */

.page-about .ab-tl-wrap {
  display: grid;
  gap: clamp(30px, 4vw, 50px);
  margin-top: clamp(30px, 5vw, 54px);
}

.page-about .ab-tl-figure {
  margin: 0;
}

.page-about .ab-tl-figure img,
.page-about .ab-team-figure img,
.page-about .ab-archive-figure img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
  border: 1px solid var(--line);
  background: var(--ink-panel);
}

.page-about .ab-tl-figure img {
  aspect-ratio: 3 / 4;
}

.page-about .ab-tl-figure figcaption,
.page-about .ab-team-figure figcaption,
.page-about .ab-archive-figure figcaption {
  margin-top: 12px;
  font-family: var(--mono);
  font-size: 12px;
  line-height: 1.6;
  letter-spacing: .06em;
  color: var(--moss);
}

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

.page-about .ab-node {
  position: relative;
  display: grid;
  grid-template-columns: var(--ab-dotcol) minmax(0, 1fr);
  grid-template-areas:
    "dot year"
    "dot body";
  column-gap: 14px;
  row-gap: 4px;
  padding: 0 0 38px;
}

.page-about .ab-node::before {
  content: "";
  position: absolute;
  left: 12px;
  top: 22px;
  bottom: -4px;
  width: 1px;
  background: var(--line);
  transition: background .22s var(--ease);
}

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

.page-about .ab-node:last-child::before {
  display: none;
}

.page-about .ab-dot {
  grid-area: dot;
  position: relative;
  display: block;
  min-height: 22px;
}

.page-about .ab-dot::before {
  content: "";
  position: absolute;
  left: 50%;
  top: 5px;
  width: 11px;
  height: 11px;
  margin-left: -5.5px;
  border-radius: 50%;
  border: 1px solid var(--tactical);
  background: var(--ink-bg);
  transition: background .22s var(--ease), box-shadow .22s var(--ease), border-color .22s var(--ease);
}

.page-about .ab-year {
  grid-area: year;
  font-family: var(--mono);
  font-size: 15px;
  font-weight: 700;
  letter-spacing: .1em;
  color: var(--tactical);
}

.page-about .ab-node-body {
  grid-area: body;
  padding: 12px 16px 14px;
  border-left: 1px solid var(--line-soft);
  background: linear-gradient(90deg, rgba(23, 229, 184, .04), transparent 70%);
  transition: background .22s var(--ease), border-color .22s var(--ease);
}

.page-about .ab-node-body h3 {
  margin: 0 0 8px;
  font-size: 18px;
  line-height: 1.4;
  font-weight: 700;
  color: var(--paper);
}

.page-about .ab-node-body p {
  margin: 0;
  max-width: 60ch;
  font-size: 15.5px;
  line-height: 1.72;
  color: var(--ab-ink-dim);
}

.page-about .ab-node:hover::before,
.page-about .ab-node:focus-visible::before,
.page-about .ab-node:focus-within::before {
  background: var(--line-tactical);
}

.page-about .ab-node:hover .ab-dot::before,
.page-about .ab-node:focus-visible .ab-dot::before,
.page-about .ab-node:focus-within .ab-dot::before {
  background: var(--tactical);
  border-color: var(--tactical-soft);
  box-shadow: 0 0 0 6px rgba(23, 229, 184, .14);
}

.page-about .ab-node:hover .ab-node-body,
.page-about .ab-node:focus-visible .ab-node-body,
.page-about .ab-node:focus-within .ab-node-body {
  border-color: var(--line-tactical);
  background: linear-gradient(90deg, rgba(23, 229, 184, .1), transparent 78%);
}

.page-about .ab-node:hover .ab-node-body p,
.page-about .ab-node:focus-visible .ab-node-body p {
  color: var(--ab-ink);
}

.page-about .ab-node:focus-visible {
  outline: 2px solid var(--tactical);
  outline-offset: 4px;
}

/* ---------- 编辑团队 ---------- */

.page-about .ab-team-figure {
  margin: 0 0 clamp(30px, 5vw, 52px);
}

.page-about .ab-team-figure img {
  aspect-ratio: 14 / 9;
}

.page-about .ab-steps {
  margin: 24px 0;
  padding: 0;
  list-style: none;
  counter-reset: ab-step;
}

.page-about .ab-steps li {
  display: grid;
  grid-template-columns: 42px minmax(0, 1fr);
  gap: 14px;
  padding: 15px 0;
  border-top: 1px solid var(--line-soft);
  counter-increment: ab-step;
}

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

.page-about .ab-steps li::before {
  content: counter(ab-step, decimal-leading-zero);
  font-family: var(--mono);
  font-size: 13px;
  font-weight: 700;
  letter-spacing: .1em;
  color: var(--tactical);
  padding-top: 4px;
}

.page-about .ab-steps li span {
  font-size: 15.5px;
  line-height: 1.72;
  color: var(--ab-ink-dim);
}

.page-about .ab-steps li b {
  display: block;
  margin-bottom: 4px;
  font-size: 16px;
  color: var(--paper);
}

/* ---------- 版图 ---------- */

.page-about .ab-map {
  margin: 8px 0 24px;
  padding: 10px;
  border: 1px solid var(--line);
  background:
    linear-gradient(rgba(23, 229, 184, .035) 1px, transparent 1px) 0 0 / 100% 34px,
    var(--carbon);
}

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

.page-about .ab-map-grid line {
  stroke: var(--line-soft);
  stroke-width: 1;
}

.page-about .ab-pt--rest circle {
  fill: var(--moss);
  opacity: .5;
}

.page-about .ab-pt-node {
  cursor: pointer;
}

.page-about .ab-pt-node:focus-visible {
  outline: none;
}

.page-about .ab-pulse {
  fill: rgba(23, 229, 184, .12);
  stroke: rgba(23, 229, 184, .45);
  stroke-width: 1;
  transition: fill .22s var(--ease), stroke .22s var(--ease);
}

.page-about .ab-dot-live {
  fill: var(--tactical);
}

.page-about .ab-pt-label {
  fill: var(--paper);
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: .06em;
  opacity: 0;
  transition: opacity .2s var(--ease);
}

.page-about .ab-pt-node:hover .ab-pulse,
.page-about .ab-pt-node:focus-visible .ab-pulse {
  fill: rgba(23, 229, 184, .24);
  stroke: var(--tactical-soft);
}

.page-about .ab-pt-node:hover .ab-pt-label,
.page-about .ab-pt-node:focus-visible .ab-pt-label {
  opacity: 1;
}

/* ---------- 档案库 ---------- */

.page-about .ab-archive-grid h2 {
  margin: 12px 0 18px;
  font-size: clamp(24px, 3.4vw, 38px);
  line-height: 1.22;
  font-weight: 800;
  letter-spacing: -.015em;
  max-width: 22ch;
}

.page-about .ab-archive-figure {
  margin: 0;
}

.page-about .ab-archive-figure img {
  aspect-ratio: 3 / 2;
}

/* ---------- 赛季交付 ---------- */

.page-about .ab-promise-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin: clamp(28px, 4vw, 44px) 0 0;
  background: var(--line-soft);
  border: 1px solid var(--line);
}

.page-about .ab-promise-cell {
  background: var(--ink-bg);
  padding: 22px 18px 24px;
}

.page-about .ab-promise-num {
  margin: 0;
  font-family: var(--mono);
  font-size: clamp(30px, 4.6vw, 46px);
  font-weight: 700;
  letter-spacing: -.02em;
  color: var(--tactical);
}

.page-about .ab-promise-num .ab-unit {
  font-size: 13px;
}

.page-about .ab-promise-label {
  margin: 12px 0 0;
  font-size: 14px;
  line-height: 1.7;
  color: var(--moss);
}

.page-about .ab-promise-note {
  margin: 22px 0 0;
  max-width: 64ch;
  padding-left: 16px;
  border-left: 2px solid var(--amber);
  font-size: 15px;
  line-height: 1.72;
  color: var(--ab-ink);
}

.page-about .ab-cta-row {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: clamp(28px, 4vw, 40px);
}

/* ---------- 响应式 ---------- */

@media (min-width: 640px) {
  .page-about .ab-facts {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

@media (min-width: 940px) {
  .page-about {
    --ab-dotcol: 30px;
    --ab-rail: 132px;
  }

  .page-about .ab-grid {
    grid-template-columns: minmax(0, 4fr) minmax(0, 7fr);
    align-items: start;
  }

  .page-about .ab-grid .ab-sec-head {
    position: sticky;
    top: 104px;
  }

  .page-about .ab-archive-grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    align-items: center;
  }

  .page-about .ab-tl-wrap {
    grid-template-columns: minmax(0, 4fr) minmax(0, 8fr);
    align-items: start;
  }

  .page-about .ab-tl-figure {
    position: sticky;
    top: 104px;
  }
}

@media (min-width: 900px) {
  .page-about .ab-node {
    grid-template-columns: var(--ab-rail) var(--ab-dotcol) minmax(0, 1fr);
    grid-template-areas: "year dot body";
    column-gap: 16px;
    row-gap: 0;
    padding-bottom: 34px;
  }

  .page-about .ab-node::before {
    left: calc(var(--ab-rail) + 15px);
    top: 20px;
  }

  .page-about .ab-year {
    padding-top: 12px;
    font-size: 16px;
  }

  .page-about .ab-dot {
    min-height: 100%;
  }

  .page-about .ab-dot::before {
    top: 18px;
  }

  .page-about .ab-node-body {
    padding: 14px 20px 16px;
  }

  .page-about .ab-node-body h3 {
    font-size: 19px;
  }

  .page-about .ab-tl .ab-node:last-child {
    padding-bottom: 0;
  }
}

@media (min-width: 1024px) {
  .page-about .ab-facts {
    grid-template-columns: repeat(6, minmax(0, 1fr));
  }

  .page-about .ab-promise-grid {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about *,
  .page-about *::before,
  .page-about *::after {
    transition-duration: .001ms !important;
  }
}