.page-about {
  --ab-cut: 4deg;
  --ab-rule: rgba(200, 255, 61, .22);
  --ab-dot: rgba(234, 246, 239, .16);
  overflow-x: clip;
}

.page-about .ab-kicker {
  margin: 0 0 14px;
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: .2em;
  text-transform: uppercase;
  color: var(--fluoro);
}

/* ---------- 页头 ---------- */
.page-about .ab-hero {
  position: relative;
  isolation: isolate;
  background: var(--ink);
  border-bottom: 1px solid var(--line);
}

.page-about .ab-hero__media {
  position: absolute;
  inset: 0;
  z-index: 0;
}

.page-about .ab-hero__media img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: 50% 42%;
  filter: saturate(.72) brightness(.62);
}

.page-about .ab-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  z-index: 1;
  pointer-events: none;
  background:
    radial-gradient(115% 95% at 8% 12%, rgba(27, 20, 64, .88), transparent 62%),
    linear-gradient(180deg, rgba(7, 19, 15, .5) 0%, rgba(7, 19, 15, .78) 52%, var(--ink) 96%);
}

.page-about .ab-hero::after {
  content: "";
  position: absolute;
  inset: 0;
  z-index: 1;
  pointer-events: none;
  opacity: .42;
  background-image: radial-gradient(var(--ab-dot) 1px, transparent 1px);
  background-size: 5px 5px;
  mix-blend-mode: overlay;
}

.page-about .ab-hero__body {
  position: relative;
  z-index: 2;
  padding-top: clamp(64px, 15vw, 172px);
  padding-bottom: clamp(52px, 11vw, 128px);
  max-width: 880px;
}

.page-about .ab-hero h1 {
  margin: 0;
  font-size: clamp(30px, 7.4vw, 66px);
  line-height: 1.08;
  letter-spacing: -.018em;
  font-weight: 700;
  color: var(--paper);
  text-wrap: balance;
}

.page-about .ab-hero__lead {
  margin: clamp(18px, 3.4vw, 30px) 0 0;
  max-width: 62ch;
  font-size: clamp(16px, 2.1vw, 18px);
  line-height: 1.75;
  color: rgba(234, 246, 239, .84);
}

.page-about .ab-hero__chips {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: clamp(24px, 4vw, 38px) 0 0;
  padding: 0;
  list-style: none;
}

.page-about .ab-hero__chips li {
  padding: 7px 14px;
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: .16em;
  color: var(--fluoro);
  border: 1px solid var(--ab-rule);
  background: rgba(16, 46, 34, .55);
}

/* ---------- 版本演进 ---------- */
.page-about .ab-ver {
  background: var(--ink);
}

.page-about .ab-ver__grid {
  display: grid;
  gap: clamp(28px, 5vw, 56px);
}

.page-about .ab-index {
  align-self: start;
}

.page-about .ab-index__title {
  margin: 0 0 12px;
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: .2em;
  text-transform: uppercase;
  color: var(--mist);
}

.page-about .ab-index__list {
  display: flex;
  gap: 8px;
  margin: 0;
  padding: 0 0 6px;
  list-style: none;
  overflow-x: auto;
  scrollbar-width: thin;
}

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

.page-about .ab-index__list a {
  display: inline-flex;
  align-items: baseline;
  gap: 8px;
  padding: 9px 14px;
  white-space: nowrap;
  font-size: 14px;
  color: var(--paper);
  text-decoration: none;
  border: 1px solid var(--line-2);
  background: rgba(12, 32, 24, .7);
  transition: border-color .18s var(--ease), color .18s var(--ease), background-color .18s var(--ease);
}

.page-about .ab-index__list a .mono {
  color: var(--cyan);
  font-weight: 700;
}

.page-about .ab-index__list a:hover,
.page-about .ab-index__list a:focus-visible {
  border-color: var(--fluoro);
  color: var(--fluoro);
  background: rgba(16, 46, 34, .95);
  outline: none;
}

.page-about .ab-index__hint {
  margin: 12px 0 0;
  font-size: 13px;
}

.page-about .ab-track {
  display: grid;
  gap: clamp(32px, 6vw, 72px);
}

.page-about .ab-track__title {
  margin: 0;
  font-size: clamp(24px, 4.4vw, 40px);
  line-height: 1.14;
  letter-spacing: -.014em;
  color: var(--paper);
  max-width: 20ch;
}

.page-about .ab-node {
  position: relative;
  display: grid;
  gap: clamp(12px, 2.4vw, 22px);
  padding: clamp(20px, 3.4vw, 34px);
  background: linear-gradient(160deg, rgba(16, 46, 34, .72), rgba(7, 19, 15, .3));
  border-left: 3px solid var(--fluoro);
  scroll-margin-top: 120px;
}

.page-about .ab-node__num {
  font-size: clamp(62px, 15vw, 132px);
  line-height: .82;
  font-weight: 700;
  letter-spacing: -.03em;
  color: rgba(200, 255, 61, .14);
  -webkit-text-stroke: 1.5px var(--fluoro);
}

.page-about .ab-node__main > .tag {
  margin: 0 0 12px;
}

.page-about .ab-node h3 {
  margin: 0 0 14px;
  font-size: clamp(21px, 3.4vw, 30px);
  line-height: 1.2;
  letter-spacing: -.012em;
  color: var(--paper);
}

.page-about .ab-node__main p {
  margin: 0 0 12px;
  max-width: 60ch;
  font-size: 16px;
  line-height: 1.75;
  color: rgba(234, 246, 239, .84);
}

.page-about .ab-node__main p.muted {
  color: var(--mist);
  font-size: 15px;
}

.page-about .ab-node__link {
  margin-top: 6px;
}

.page-about .ab-textlink {
  display: inline-block;
  padding-bottom: 3px;
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(53, 224, 161, .45);
  transition: color .18s var(--ease), border-color .18s var(--ease);
}

.page-about .ab-textlink:hover,
.page-about .ab-textlink:focus-visible {
  color: var(--fluoro);
  border-color: var(--fluoro);
  outline: none;
}

.page-about .ab-node:target {
  background: linear-gradient(160deg, rgba(16, 46, 34, .95), rgba(12, 32, 24, .6));
  border-left-color: var(--cyan);
}

.page-about .ab-node:target .ab-node__num {
  color: rgba(53, 224, 161, .2);
  -webkit-text-stroke-color: var(--cyan);
}

.page-about .ab-exhibit {
  margin: 0;
}

.page-about .ab-exhibit__frame {
  max-width: 520px;
  border: 1px solid var(--ab-rule);
  background: var(--grass);
}

/* ---------- 业务线 ---------- */
.page-about .ab-lines {
  background: var(--grass);
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}

.page-about .ab-lines__grid {
  display: grid;
  gap: clamp(26px, 4.6vw, 48px);
}

.page-about .ab-lines__intro h2 {
  margin: 0 0 16px;
  font-size: clamp(24px, 4.4vw, 40px);
  line-height: 1.14;
  letter-spacing: -.014em;
  color: var(--paper);
}

.page-about .ab-lines__intro .lead {
  margin: 0;
  max-width: 58ch;
  color: rgba(234, 246, 239, .82);
}

.page-about .ab-lines__tags {
  display: grid;
  gap: 12px;
}

.page-about .ab-line {
  padding: 18px 20px;
  background: rgba(7, 19, 15, .62);
  border: 1px solid var(--line-2);
  border-top: 2px solid var(--fluoro);
  transition: background-color .2s var(--ease), border-color .2s var(--ease);
}

.page-about .ab-line:hover,
.page-about .ab-line:focus-within {
  background: rgba(16, 46, 34, .92);
  border-color: var(--ab-rule);
}

.page-about .ab-line:focus-visible {
  outline: 2px solid var(--fluoro);
  outline-offset: 3px;
}

.page-about .ab-line__head {
  display: flex;
  align-items: baseline;
  gap: 12px;
  margin: 0 0 8px;
}

.page-about .ab-line__no {
  font-size: 12px;
  letter-spacing: .18em;
  color: var(--mist);
}

.page-about .ab-line__name {
  font-size: 19px;
  font-weight: 700;
  letter-spacing: -.01em;
  color: var(--fluoro);
}

.page-about .ab-line__desc {
  margin: 0;
  font-size: 15px;
  line-height: 1.72;
  color: rgba(234, 246, 239, .8);
}

.page-about .ab-lines__media {
  align-self: start;
}

.page-about .ab-lines__media .frame {
  border: 1px solid var(--ab-rule);
  background: var(--ink);
}

/* ---------- 比赛日 ---------- */
.page-about .ab-day {
  background: var(--ink);
}

.page-about .ab-day h2 {
  margin: 0 0 14px;
  font-size: clamp(24px, 4.4vw, 40px);
  line-height: 1.14;
  letter-spacing: -.014em;
  color: var(--paper);
}

.page-about .ab-day__lead {
  margin: 0 0 clamp(26px, 4vw, 42px);
  max-width: 56ch;
  color: var(--mist);
}

.page-about .ab-day__list {
  display: grid;
  gap: 1px;
  margin: 0;
  padding: 0;
  list-style: none;
  background: var(--line-2);
  border-top: 1px solid var(--line-2);
  border-bottom: 1px solid var(--line-2);
}

.page-about .ab-day__item {
  padding: 22px 20px 24px;
  background: var(--ink);
  border-left: 3px solid transparent;
  transition: border-color .2s var(--ease), background-color .2s var(--ease);
}

.page-about .ab-day__item:hover {
  background: rgba(12, 32, 24, .78);
  border-left-color: var(--fluoro);
}

.page-about .ab-day__time {
  margin: 0 0 10px;
  font-size: 12px;
  letter-spacing: .16em;
  color: var(--cyan);
  text-transform: uppercase;
}

.page-about .ab-day__item h3 {
  margin: 0 0 8px;
  font-size: 19px;
  letter-spacing: -.01em;
  color: var(--paper);
}

.page-about .ab-day__item p {
  margin: 0;
  font-size: 15px;
  line-height: 1.72;
  color: rgba(234, 246, 239, .78);
}

/* ---------- 规模 ---------- */
.page-about .ab-scale {
  background: linear-gradient(180deg, var(--violet) 0%, var(--ink) 68%);
}

.page-about .ab-scale h2 {
  margin: 0 0 14px;
  font-size: clamp(24px, 4.4vw, 40px);
  line-height: 1.14;
  letter-spacing: -.014em;
  color: var(--paper);
}

.page-about .ab-scale__lead {
  margin: 0 0 clamp(26px, 4vw, 44px);
  max-width: 52ch;
  color: rgba(234, 246, 239, .8);
}

.page-about .ab-scale__grid {
  display: grid;
  gap: 1px;
  background: var(--line-2);
  border: 1px solid var(--line-2);
}

.page-about .ab-scale__cell {
  padding: 26px 22px 30px;
  background: rgba(7, 19, 15, .78);
}

.page-about .ab-scale__num {
  margin: 0 0 10px;
  font-size: clamp(46px, 12vw, 76px);
  line-height: .9;
  font-weight: 700;
  letter-spacing: -.03em;
  font-variant-numeric: tabular-nums;
  color: var(--fluoro);
}

.page-about .ab-scale__num .metric__unit {
  font-size: .38em;
  letter-spacing: 0;
  margin-left: 4px;
  color: var(--cyan);
}

.page-about .ab-scale__label {
  margin: 0 0 10px;
  font-size: 15px;
  font-weight: 700;
  letter-spacing: .04em;
  color: var(--paper);
}

.page-about .ab-scale__note {
  margin: 0;
  font-size: 14px;
  line-height: 1.7;
  color: var(--mist);
}

/* ---------- 使用者 ---------- */
.page-about .ab-who {
  background: var(--ink);
}

.page-about .ab-who h2 {
  margin: 0 0 clamp(26px, 4vw, 44px);
  font-size: clamp(24px, 4.4vw, 40px);
  line-height: 1.14;
  letter-spacing: -.014em;
  color: var(--paper);
}

.page-about .ab-who__grid {
  display: grid;
  gap: 16px;
}

.page-about .ab-who__card {
  padding: 26px 22px 28px;
  border-top: 2px solid var(--cyan);
}

.page-about .ab-who__card .tag {
  margin: 0 0 14px;
}

.page-about .ab-who__card h3 {
  margin: 0 0 12px;
  font-size: 20px;
  letter-spacing: -.01em;
  color: var(--paper);
}

.page-about .ab-who__card p {
  margin: 0;
  font-size: 15px;
  line-height: 1.74;
  color: rgba(234, 246, 239, .8);
}

/* ---------- 生态 ---------- */
.page-about .ab-eco {
  background: var(--grass);
  border-top: 1px solid var(--line);
}

.page-about .ab-eco__inner {
  display: grid;
  gap: clamp(28px, 5vw, 60px);
}

.page-about .ab-eco__text h2 {
  margin: 0 0 18px;
  font-size: clamp(24px, 4.4vw, 40px);
  line-height: 1.14;
  letter-spacing: -.014em;
  color: var(--paper);
  max-width: 22ch;
}

.page-about .ab-eco__text p {
  margin: 0 0 14px;
  max-width: 62ch;
  font-size: 16px;
  line-height: 1.75;
  color: rgba(234, 246, 239, .84);
}

.page-about .ab-eco__text p.muted {
  color: var(--mist);
  font-size: 15px;
}

.page-about .ab-eco__cta {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin: 24px 0 0;
}

.page-about .ab-eco__links {
  display: grid;
  gap: 0;
  align-self: start;
  border-top: 1px solid var(--ab-rule);
}

.page-about .ab-eco__links-title {
  margin: 0;
  padding: 12px 0;
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: .2em;
  text-transform: uppercase;
  color: var(--mist);
}

.page-about .ab-eco__links a {
  padding: 16px 4px 16px 0;
  font-size: 15px;
  line-height: 1.5;
  color: var(--paper);
  text-decoration: none;
  border-top: 1px solid var(--line-2);
  transition: color .18s var(--ease), padding-left .18s var(--ease);
}

.page-about .ab-eco__links a:hover,
.page-about .ab-eco__links a:focus-visible {
  color: var(--fluoro);
  padding-left: 10px;
  outline: none;
}

/* ---------- 图片通用 ---------- */
.page-about img {
  max-width: 100%;
  height: auto;
  display: block;
}

/* ---------- 窄屏 ---------- */
@media (max-width: 599px) {
  .page-about .ab-hero__media img {
    object-position: 58% 46%;
  }

  .page-about .ab-node {
    border-left-width: 2px;
  }

  .page-about .ab-eco__cta .btn {
    flex: 1 1 auto;
    text-align: center;
  }
}

/* ---------- 平板及以上 ---------- */
@media (min-width: 760px) {
  .page-about .ab-day__list {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

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

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

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

/* ---------- 桌面 ---------- */
@media (min-width: 960px) {
  .page-about .ab-ver__grid {
    grid-template-columns: 236px minmax(0, 1fr);
    align-items: start;
  }

  .page-about .ab-index {
    position: sticky;
    top: 116px;
  }

  .page-about .ab-index__list {
    flex-direction: column;
    overflow: visible;
    padding-bottom: 0;
  }

  .page-about .ab-index__list a {
    width: 100%;
    border-left: 2px solid var(--line-2);
    border-top: none;
    border-right: none;
    border-bottom: none;
    background: transparent;
  }

  .page-about .ab-index__list a:hover,
  .page-about .ab-index__list a:focus-visible {
    border-left-color: var(--fluoro);
    padding-left: 16px;
  }

  .page-about .ab-node {
    grid-template-columns: 176px minmax(0, 1fr);
    align-items: start;
    gap: clamp(20px, 3vw, 40px);
    padding: clamp(28px, 3.6vw, 46px);
  }

  .page-about .ab-node--shift {
    margin-left: clamp(0px, 9%, 108px);
  }

  .page-about .ab-node:nth-child(odd) {
    margin-right: clamp(0px, 6%, 72px);
  }

  .page-about .ab-exhibit {
    margin-left: clamp(0px, 12%, 140px);
  }

  .page-about .ab-lines__grid {
    grid-template-columns: minmax(0, 1.12fr) minmax(0, .88fr);
    align-items: start;
  }

  .page-about .ab-lines__intro {
    grid-column: 1 / -1;
    max-width: 62ch;
  }

  .page-about .ab-lines__tags {
    grid-column: 1;
  }

  .page-about .ab-lines__media {
    grid-column: 2;
    position: sticky;
    top: 116px;
  }

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

  .page-about .ab-day__item {
    padding: 30px 24px 34px;
  }

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

  .page-about .ab-scale__cell {
    padding: 34px 26px 38px;
  }

  .page-about .ab-eco__inner {
    grid-template-columns: minmax(0, 1.35fr) minmax(0, .65fr);
    align-items: start;
  }
}

/* ---------- 超宽 ---------- */
@media (min-width: 1200px) {
  .page-about .ab-hero__body {
    padding-top: 196px;
    padding-bottom: 150px;
  }

  .page-about .ab-node {
    grid-template-columns: 208px minmax(0, 1fr);
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .ab-node,
  .page-about .ab-line,
  .page-about .ab-day__item,
  .page-about .ab-eco__links a,
  .page-about .ab-index__list a {
    transition: none;
  }
}