.page-about {
  --ab-rail: 250px;
  --ab-gap: clamp(22px, 3.4vw, 52px);
  --ab-line: var(--ma-stroke);
  --ab-red-wash: rgba(158, 27, 47, .14);
  background: var(--ma-black);
  color: var(--ma-slate);
  font-family: var(--ma-font-body);
  overflow-x: hidden;
}

/* ---------- 首屏 ---------- */

.page-about .ab-hero {
  position: relative;
  padding: clamp(26px, 4.5vw, 60px) 0 clamp(30px, 4.5vw, 58px);
  background:
    radial-gradient(120% 78% at 88% -10%, rgba(158, 27, 47, .34), transparent 62%),
    radial-gradient(90% 60% at 4% 110%, rgba(74, 15, 28, .55), transparent 60%),
    linear-gradient(180deg, #0A0A0C 0%, #101015 100%);
  overflow: hidden;
}

.page-about .ab-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(to right, rgba(138, 151, 172, .07) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(138, 151, 172, .07) 1px, transparent 1px);
  background-size: 88px 88px;
  -webkit-mask-image: linear-gradient(180deg, rgba(0, 0, 0, .95), transparent 88%);
  mask-image: linear-gradient(180deg, rgba(0, 0, 0, .95), transparent 88%);
  pointer-events: none;
}

.page-about .ab-hero .ma-wrap {
  position: relative;
  z-index: 1;
}

.page-about .ab-hero__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--ab-gap);
  align-items: end;
  margin-top: clamp(16px, 3vw, 34px);
}

.page-about .ab-hero__title {
  font-family: var(--ma-font-head);
  font-weight: 700;
  font-size: clamp(31px, 5.4vw, 56px);
  line-height: 1.12;
  letter-spacing: -0.01em;
  color: var(--ma-paper);
  margin: 14px 0 0;
  padding-bottom: 22px;
  border-bottom: 2px solid var(--ma-red);
  max-width: 16em;
}

.page-about .ab-hero__lead {
  margin: 22px 0 0;
  max-width: 34em;
  color: #B9C1CF;
  font-size: clamp(16px, 1.9vw, 17px);
  line-height: 1.78;
}

.page-about .ab-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 26px;
}

.page-about .ab-hero__media {
  position: relative;
  margin: 0;
  border: 1px solid var(--ab-line);
  background: var(--ma-panel);
}

.page-about .ab-hero__media::before {
  content: "ARCHIVE / EST. 2019";
  position: absolute;
  top: 0;
  left: 0;
  z-index: 2;
  padding: 7px 12px;
  background: var(--ma-red);
  color: var(--ma-paper);
  font-family: var(--ma-font-mono);
  font-size: 11px;
  letter-spacing: .16em;
}

.page-about .ab-hero__media img {
  display: block;
  width: 100%;
  height: auto;
  max-width: 100%;
  object-fit: cover;
  filter: contrast(1.06) saturate(.72) brightness(.9);
}

.page-about .ab-hero__media .ma-media__caption {
  display: block;
  padding: 10px 14px;
  border-top: 1px solid var(--ab-line);
  font-family: var(--ma-font-mono);
  font-size: 12px;
  color: var(--ma-slate);
}

/* 数字条 */

.page-about .ab-stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--ab-line);
  border-top: 1px solid var(--ab-line);
  border-bottom: 1px solid var(--ab-line);
  margin-top: clamp(30px, 4.5vw, 56px);
}

.page-about .ab-stats__item {
  background: var(--ma-black);
  padding: 18px 16px 20px;
  display: flex;
  flex-direction: column;
  gap: 8px;
  min-width: 0;
}

.page-about .ab-stats__num {
  font-family: var(--ma-font-display);
  font-size: clamp(30px, 4.2vw, 46px);
  line-height: 1;
  letter-spacing: .01em;
  color: var(--ma-paper);
}

.page-about .ab-stats__tail {
  font-size: .48em;
  margin-left: 2px;
  color: var(--ma-slate);
}

.page-about .ab-stats__label {
  font-family: var(--ma-font-mono);
  font-size: 12px;
  letter-spacing: .1em;
  color: var(--ma-slate);
  word-break: break-word;
}

.page-about .ab-stats__item--live .ab-stats__num {
  color: var(--ma-mint);
}

/* ---------- 通用双栏骨架 ---------- */

.page-about .ab-split {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--ab-gap);
}

.page-about .ab-rail__no {
  margin: 0 0 16px;
  color: var(--ma-red-hot);
  font-size: 12px;
  letter-spacing: .18em;
}

.page-about .ab-rail__list {
  list-style: none;
  margin: 0;
  padding: 0;
  border-top: 1px solid var(--ab-line);
}

.page-about .ab-rail__list li {
  display: flex;
  gap: 12px;
  align-items: baseline;
  padding: 12px 0;
  border-bottom: 1px solid var(--ab-line);
  font-family: var(--ma-font-mono);
  font-size: 12.5px;
  line-height: 1.6;
  color: var(--ma-slate);
}

.page-about .ab-rail__list li span {
  flex: none;
  min-width: 3.4em;
  font-size: 15px;
  color: var(--ma-paper);
  letter-spacing: .04em;
}

.page-about .ab-rail__hint {
  margin: 0;
  font-size: 13.5px;
  line-height: 1.8;
  color: var(--ma-slate);
  border-left: 2px solid var(--ma-red);
  padding-left: 14px;
}

.page-about .ab-body {
  min-width: 0;
}

/* ---------- 档案室 ---------- */

.page-about .ab-room .ma-prose p {
  margin: 0 0 18px;
  font-size: 16.5px;
  line-height: 1.85;
  color: #AEB7C6;
}

.page-about .ab-room .ma-prose p:first-child::first-letter {
  font-family: var(--ma-font-head);
  font-size: 3em;
  line-height: .9;
  float: left;
  margin: 6px 12px 0 0;
  color: var(--ma-paper);
}

.page-about .ab-index {
  margin-top: 30px;
  border-top: 1px solid var(--ab-line);
}

.page-about .ab-index .ma-index__row {
  display: grid;
  grid-template-columns: 42px minmax(0, 130px) minmax(0, 1fr);
  gap: 14px;
  align-items: baseline;
  padding: 12px 0;
  border-bottom: 1px solid var(--ab-line);
  font-family: var(--ma-font-mono);
  font-size: 12.5px;
}

.page-about .ab-index .ma-index__no {
  color: var(--ma-red-hot);
  letter-spacing: .1em;
}

.page-about .ab-index .ma-index__label {
  color: var(--ma-slate);
}

.page-about .ab-index .ma-index__value {
  color: var(--ma-paper);
  letter-spacing: .02em;
}

/* ---------- 生产流程 ---------- */

.page-about .ab-flow__intro {
  margin: 18px 0 34px;
  max-width: 38em;
  font-size: 16.5px;
  line-height: 1.8;
  color: #AEB7C6;
}

.page-about .ab-flow__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: 1fr;
  border-top: 1px solid var(--ab-line);
}

.page-about .ab-flow__step {
  position: relative;
  padding: 24px 18px 28px 22px;
  border-bottom: 1px solid var(--ab-line);
  background: linear-gradient(180deg, rgba(31, 31, 38, .5), rgba(10, 10, 12, 0));
}

.page-about .ab-flow__step::before {
  content: "";
  position: absolute;
  left: 0;
  top: 24px;
  width: 3px;
  height: 34px;
  background: var(--ma-red);
}

.page-about .ab-flow__no {
  display: inline-block;
  font-family: var(--ma-font-mono);
  font-size: 12px;
  letter-spacing: .16em;
  color: var(--ma-mint);
  margin-bottom: 12px;
}

.page-about .ab-flow__name {
  margin: 0 0 10px;
  font-family: var(--ma-font-head);
  font-size: 19px;
  font-weight: 700;
  color: var(--ma-paper);
  letter-spacing: .01em;
}

.page-about .ab-flow__desc {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.8;
  color: var(--ma-slate);
}

.page-about .ab-flow__media {
  margin: clamp(28px, 4vw, 50px) 0 0;
  border: 1px solid var(--ab-line);
  background: var(--ma-panel);
}

.page-about .ab-flow__media img {
  display: block;
  width: 100%;
  height: auto;
  max-width: 100%;
  aspect-ratio: 4 / 3;
  object-fit: cover;
  filter: contrast(1.04) saturate(.7) brightness(.88);
}

.page-about .ab-flow__media .ma-media__caption {
  display: block;
  padding: 10px 14px;
  border-top: 1px solid var(--ab-line);
  font-family: var(--ma-font-mono);
  font-size: 12px;
  color: var(--ma-slate);
}

/* ---------- 赛事战线 ---------- */

.page-about .ab-stage__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(26px, 4vw, 56px);
  align-items: start;
}

.page-about .ab-stage__media {
  margin: 0;
  border: 1px solid var(--ab-line);
  background: var(--ma-panel);
  overflow: hidden;
}

.page-about .ab-stage__media img {
  display: block;
  width: 100%;
  height: auto;
  max-width: 100%;
  aspect-ratio: 5 / 6;
  object-fit: cover;
  transform: rotate(-4deg) scale(1.12);
  filter: contrast(1.06) saturate(.6) brightness(.82);
}

.page-about .ab-stage__lead {
  margin: 18px 0 0;
  max-width: 36em;
  font-size: 16px;
  line-height: 1.8;
  color: #AEB7C6;
}

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

.page-about .ab-stage__item {
  display: grid;
  grid-template-columns: 1fr;
  gap: 10px;
  padding: 18px 14px 18px 12px;
  border-top: 1px solid var(--ab-line);
  border-left: 2px solid transparent;
  transition: border-color .25s var(--ma-ease), background-color .25s var(--ma-ease);
}

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

.page-about .ab-stage__item:hover {
  border-left-color: var(--ma-red);
  background: var(--ab-red-wash);
}

.page-about .ab-stage__tag {
  justify-self: start;
}

.page-about .ab-stage__text h3 {
  margin: 8px 0 8px;
  font-family: var(--ma-font-head);
  font-size: 17.5px;
  font-weight: 700;
  color: var(--ma-paper);
}

.page-about .ab-stage__text p {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.8;
  color: var(--ma-slate);
}

/* ---------- 团队分工 ---------- */

.page-about .ab-team__lead {
  margin: 18px 0 0;
  max-width: 38em;
  font-size: 16px;
  line-height: 1.8;
  color: #AEB7C6;
}

.page-about .ab-team__map {
  display: grid;
  grid-template-columns: 1fr;
  margin-top: 34px;
  border-top: 1px solid var(--ab-line);
}

.page-about .ab-team__node {
  position: relative;
  padding: 26px 22px 30px;
  border-bottom: 1px solid var(--ab-line);
  transition: background-color .3s var(--ma-ease);
  outline: none;
}

.page-about .ab-team__node::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  width: 2px;
  height: 0;
  background: var(--ma-mint);
  transition: height .38s var(--ma-ease);
}

.page-about .ab-team__node:hover,
.page-about .ab-team__node:focus-visible {
  background: rgba(31, 31, 38, .72);
}

.page-about .ab-team__node:hover::before,
.page-about .ab-team__node:focus-visible::before {
  height: 100%;
}

.page-about .ab-team__node:focus-visible {
  box-shadow: inset 0 0 0 2px var(--ma-mint);
}

.page-about .ab-team__idx {
  display: block;
  font-family: var(--ma-font-display);
  font-size: 30px;
  line-height: 1;
  color: var(--ma-red);
  letter-spacing: .04em;
}

.page-about .ab-team__name {
  margin: 14px 0 10px;
  font-family: var(--ma-font-head);
  font-size: 20px;
  font-weight: 700;
  color: var(--ma-paper);
}

.page-about .ab-team__desc {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.8;
  color: var(--ma-slate);
}

.page-about .ab-team__note {
  margin: 22px 0 0;
  padding-left: 14px;
  border-left: 2px solid var(--ma-mint);
  font-size: 12.5px;
  line-height: 1.9;
  color: var(--ma-slate);
}

/* ---------- 赛季时间线 ---------- */

.page-about .ab-tl {
  margin-top: 26px;
  border-top: 1px solid var(--ab-line);
}

.page-about .ab-tl .ma-disc {
  border-bottom: 1px solid var(--ab-line);
}

.page-about .ab-tl .ma-disc__summary {
  cursor: pointer;
  padding: 16px 34px 16px 0;
  position: relative;
  font-family: var(--ma-font-head);
  font-size: 17px;
  font-weight: 700;
  color: var(--ma-paper);
  letter-spacing: .01em;
  list-style: none;
}

.page-about .ab-tl .ma-disc__summary::-webkit-details-marker {
  display: none;
}

.page-about .ab-tl .ma-disc__summary::after {
  content: "+";
  position: absolute;
  right: 4px;
  top: 50%;
  transform: translateY(-50%);
  font-family: var(--ma-font-mono);
  font-size: 18px;
  color: var(--ma-red-hot);
}

.page-about .ab-tl .ma-disc[open] .ma-disc__summary::after {
  content: "−";
}

.page-about .ab-tl .ma-disc__summary:focus-visible {
  outline: 2px solid var(--ma-mint);
  outline-offset: 2px;
}

.page-about .ab-tl .ma-disc__body {
  padding: 0 0 20px;
}

.page-about .ab-tl .ma-disc__body p {
  margin: 0;
  max-width: 36em;
  font-size: 15px;
  line-height: 1.85;
  color: var(--ma-slate);
}

/* ---------- 合作生态 ---------- */

.page-about .ab-partner__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1px;
  background: var(--ab-line);
  border: 1px solid var(--ab-line);
  margin-top: 30px;
}

.page-about .ab-partner__item {
  background: var(--ma-black);
  padding: 26px 22px 30px;
  position: relative;
}

.page-about .ab-partner__num {
  display: block;
  font-family: var(--ma-font-display);
  font-size: clamp(34px, 5vw, 52px);
  line-height: 1;
  color: var(--ma-red);
  letter-spacing: .02em;
}

.page-about .ab-partner__item--wide .ab-partner__num {
  color: var(--ma-mint);
}

.page-about .ab-partner__name {
  margin: 14px 0 10px;
  font-family: var(--ma-font-head);
  font-size: 19px;
  font-weight: 700;
  color: var(--ma-paper);
}

.page-about .ab-partner__item p {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.8;
  color: var(--ma-slate);
}

/* ---------- 收尾 ---------- */

.page-about .ab-cta {
  padding-bottom: clamp(46px, 7vw, 96px);
}

.page-about .ab-cta__box {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(24px, 3.5vw, 48px);
  padding: clamp(28px, 4.5vw, 56px) clamp(22px, 4vw, 52px);
  border: 1px solid var(--ma-red);
  background:
    radial-gradient(110% 130% at 8% 0%, rgba(158, 27, 47, .42), transparent 62%),
    linear-gradient(140deg, #14060A 0%, #0A0A0C 68%);
}

.page-about .ab-cta__mono {
  margin: 0 0 14px;
  font-size: 11.5px;
  letter-spacing: .2em;
  color: var(--ma-mint);
}

.page-about .ab-cta__title {
  margin: 0 0 16px;
  font-family: var(--ma-font-head);
  font-size: clamp(24px, 3.4vw, 36px);
  font-weight: 700;
  line-height: 1.22;
  color: var(--ma-paper);
  max-width: 20em;
}

.page-about .ab-cta__desc {
  margin: 0;
  max-width: 36em;
  font-size: 15.5px;
  line-height: 1.85;
  color: #B9C1CF;
}

.page-about .ab-cta__links {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  align-content: start;
}

/* ---------- 平板与桌面 ---------- */

@media (min-width: 640px) {
  .page-about .ab-stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .page-about .ab-stage__item {
    grid-template-columns: 96px minmax(0, 1fr);
    gap: 18px;
    align-items: start;
  }

  .page-about .ab-stage__tag {
    margin-top: 10px;
  }

  .page-about .ab-stage__text h3 {
    margin-top: 0;
  }

  .page-about .ab-partner__grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .page-about .ab-partner__item--wide {
    grid-column: 1 / -1;
  }
}

@media (min-width: 860px) {
  .page-about .ab-hero__grid {
    grid-template-columns: minmax(0, 1.02fr) minmax(0, .98fr);
    gap: clamp(30px, 4.5vw, 68px);
  }

  .page-about .ab-flow__list {
    grid-template-columns: repeat(5, minmax(0, 1fr));
  }

  .page-about .ab-flow__step {
    border-bottom: 0;
    border-right: 1px solid var(--ab-line);
    padding: 26px 20px 32px 20px;
  }

  .page-about .ab-flow__step:last-child {
    border-right: 0;
  }

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

  .page-about .ab-team__node {
    border-bottom: 0;
    border-right: 1px solid var(--ab-line);
  }

  .page-about .ab-team__node:last-child {
    border-right: 0;
  }

  .page-about .ab-cta__box {
    grid-template-columns: minmax(0, 1.5fr) minmax(0, 1fr);
    align-items: center;
  }
}

@media (min-width: 960px) {
  .page-about .ab-split {
    grid-template-columns: var(--ab-rail) minmax(0, 1fr);
    gap: clamp(36px, 5vw, 84px);
  }

  .page-about .ab-rail {
    position: sticky;
    top: 104px;
    align-self: start;
  }

  .page-about .ab-stage__grid {
    grid-template-columns: minmax(0, .82fr) minmax(0, 1.18fr);
    gap: clamp(34px, 5vw, 76px);
  }

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

  .page-about .ab-partner__item--wide {
    grid-column: auto;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .ab-team__node,
  .page-about .ab-team__node::before,
  .page-about .ab-tl .ma-disc__summary::after {
    transition: none;
  }

  .page-about .ab-stage__media img {
    transform: none;
  }
}