.page-about {
  --about-narrow: 44rem;
  --about-mid: 62rem;
  --about-rail: 3.05rem;
  display: block;
  background:
    repeating-linear-gradient(0deg, rgba(255, 255, 255, .012) 0 1px, transparent 1px 56px),
    repeating-linear-gradient(90deg, rgba(255, 255, 255, .012) 0 1px, transparent 1px 56px),
    var(--ao-950);
}

/* ---------- hero ---------- */

.page-about .about-hero {
  position: relative;
  padding-top: clamp(16px, 3vw, 34px);
  background:
    radial-gradient(120% 90% at 84% -10%, rgba(200, 16, 46, .24), transparent 62%),
    var(--ao-950);
  overflow: hidden;
}

.page-about .about-hero .breadcrumb {
  font-size: 12.5px;
  color: var(--ao-muted);
  margin-bottom: clamp(14px, 2.4vw, 26px);
}

.page-about .about-hero .breadcrumb a {
  color: var(--ao-muted);
  text-decoration: none;
  border-bottom: 1px solid transparent;
}

.page-about .about-hero .breadcrumb a:hover,
.page-about .about-hero .breadcrumb a:focus-visible {
  color: var(--ao-cyan);
  border-bottom-color: var(--ao-cyan);
}

.page-about .about-hero__head {
  max-width: 60rem;
  padding-bottom: clamp(22px, 4vw, 44px);
}

.page-about .about-hero__kicker {
  margin: 0 0 10px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .18em;
  color: var(--ao-red-hi);
}

.page-about .about-hero__head h1 {
  margin: 0 0 16px;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(30px, 5.6vw, 58px);
  line-height: 1.08;
  letter-spacing: .01em;
  color: var(--ao-ink);
}

.page-about .about-hero__lead {
  margin: 0;
  max-width: 46rem;
  font-size: 15px;
  line-height: 1.8;
  color: var(--ao-muted);
}

.page-about .about-hero__band {
  position: relative;
  height: clamp(170px, 30vw, 350px);
  overflow: hidden;
  border-top: 1px solid var(--ao-700);
}

.page-about .about-hero__band img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: .6;
  filter: saturate(.7);
}

.page-about .about-hero__band::after {
  content: "";
  position: absolute;
  inset: 0;
  background:
    linear-gradient(180deg, rgba(8, 10, 13, .5) 0%, rgba(8, 10, 13, .12) 42%, var(--ao-950) 100%),
    linear-gradient(90deg, var(--ao-950) 0%, rgba(8, 10, 13, 0) 30%);
}

/* ---------- 区块骨架 ---------- */

.page-about .about-section {
  padding: clamp(38px, 6vw, 78px) 0;
}

.page-about .about-section + .about-section {
  border-top: 1px solid var(--ao-800);
}

.page-about .about-head {
  max-width: var(--about-narrow);
  margin-bottom: clamp(20px, 3.2vw, 36px);
}

.page-about .about-head__kicker {
  margin: 0 0 8px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .16em;
  color: var(--ao-red-hi);
}

.page-about .about-head h2 {
  margin: 0 0 10px;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(22px, 3.2vw, 36px);
  line-height: 1.2;
  color: var(--ao-ink);
}

.page-about .about-head__note {
  margin: 0;
  font-size: 13px;
  line-height: 1.7;
  color: var(--ao-muted);
}

.page-about .about-narrow {
  max-width: var(--about-narrow);
  margin-inline: auto;
}

.page-about .about-mid {
  max-width: var(--about-mid);
  margin-inline: auto;
}

/* ---------- 01 起点 + 时间线 ---------- */

.page-about .about-origin__grid {
  display: grid;
  gap: clamp(26px, 4vw, 50px);
}

.page-about .about-origin__text p {
  margin: 0 0 14px;
  max-width: 38em;
  font-size: 15px;
  line-height: 1.85;
  color: var(--ao-muted);
}

.page-about .about-origin__text p:first-child::first-letter {
  font-family: var(--font-display);
  font-size: 2.4em;
  line-height: .9;
  color: var(--ao-red-hi);
  margin-right: .08em;
}

.page-about .about-timeline {
  list-style: none;
  margin: 0;
  padding: 0;
  position: relative;
}

.page-about .about-timeline::before {
  content: "";
  position: absolute;
  left: var(--about-rail);
  top: 12px;
  bottom: 16px;
  width: 2px;
  margin-left: -1px;
  background: linear-gradient(180deg, #F5A524 0%, #2BE08A 100%);
  border-radius: 2px;
}

.page-about .about-timeline__item {
  position: relative;
  padding: 0 0 20px 4.5rem;
  outline: none;
}

.page-about .about-timeline__item::before {
  content: "";
  position: absolute;
  left: var(--about-rail);
  top: .42rem;
  width: 11px;
  height: 11px;
  border-radius: 50%;
  transform: translateX(-50%);
  box-shadow: 0 0 0 4px var(--ao-950);
  transition: transform .24s ease;
}

.page-about .about-timeline__item:nth-child(1)::before { background: #F5A524; }
.page-about .about-timeline__item:nth-child(2)::before { background: #EFAF35; }
.page-about .about-timeline__item:nth-child(3)::before { background: #E3B846; }
.page-about .about-timeline__item:nth-child(4)::before { background: #C7C055; }
.page-about .about-timeline__item:nth-child(5)::before { background: #9CCB69; }
.page-about .about-timeline__item:nth-child(6)::before { background: #6DD37C; }
.page-about .about-timeline__item:nth-child(7)::before { background: #44DA83; }
.page-about .about-timeline__item:nth-child(8)::before { background: #2BE08A; }

.page-about .about-timeline__item:hover::before,
.page-about .about-timeline__item:focus-within::before,
.page-about .about-timeline__item:focus::before {
  transform: translateX(-50%) scale(1.45);
}

.page-about .about-timeline__year {
  position: absolute;
  left: 0;
  top: .12rem;
  font-size: 12.5px;
  letter-spacing: .04em;
  color: var(--ao-muted);
}

.page-about .about-timeline__body {
  display: block;
}

.page-about .about-timeline__body strong {
  display: block;
  font-family: var(--font-display);
  font-size: 17px;
  font-weight: 700;
  color: var(--ao-ink);
  letter-spacing: .01em;
}

.page-about .about-timeline__body em {
  display: block;
  font-style: normal;
  max-height: 0;
  overflow: hidden;
  opacity: 0;
  font-size: 13px;
  line-height: 1.7;
  color: var(--ao-muted);
  transition: max-height .24s ease, opacity .24s ease, margin-top .24s ease;
}

.page-about .about-timeline__item:hover .about-timeline__body em,
.page-about .about-timeline__item:focus-within .about-timeline__body em,
.page-about .about-timeline__item:focus .about-timeline__body em {
  max-height: 6em;
  opacity: 1;
  margin-top: 5px;
}

/* ---------- 02 赛区说明牌 ---------- */

.page-about .about-regions__layout {
  display: grid;
  gap: clamp(20px, 3vw, 34px);
}

.page-about .about-regions__figure {
  margin: 0;
}

.page-about .about-regions__figure img {
  display: block;
  width: 100%;
  height: auto;
  border: 1px solid var(--ao-700);
  border-radius: var(--radius);
  opacity: .82;
  filter: saturate(.75);
}

.page-about .about-regions__figure figcaption {
  margin-top: 10px;
  font-size: 12.5px;
  line-height: 1.65;
  color: var(--ao-muted);
}

.page-about .about-regions__tabs .tabs__list {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin-bottom: 16px;
}

.page-about .about-region-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 12px;
}

.page-about .about-region-card {
  position: relative;
  background: var(--ao-800);
  border: 1px solid var(--ao-700);
  border-left: 3px solid var(--ao-red);
  border-radius: var(--radius);
  padding: 15px 16px 14px;
  transition: border-left-color .2s ease, background-color .2s ease;
}

.page-about .about-region-card:hover {
  border-left-color: var(--ao-red-hi);
  background: #1a1f26;
}

.page-about .about-region-card__no {
  display: block;
  margin-bottom: 6px;
  font-size: 12px;
  letter-spacing: .16em;
  color: var(--ao-red-hi);
}

.page-about .about-region-card__name {
  margin: 0 0 12px;
  font-family: var(--font-display);
  font-size: 19px;
  font-weight: 700;
  color: var(--ao-ink);
  letter-spacing: .02em;
}

.page-about .about-region-card__data {
  margin: 0;
  display: grid;
  gap: 6px;
}

.page-about .about-region-card__data > div {
  display: grid;
  grid-template-columns: 5rem minmax(0, 1fr);
  gap: 10px;
  align-items: baseline;
}

.page-about .about-region-card__data dt {
  font-size: 12.5px;
  color: var(--ao-muted);
}

.page-about .about-region-card__data dd {
  margin: 0;
  font-size: 13px;
  line-height: 1.6;
  color: var(--ao-ink);
}

.page-about .about-region-card__data dd .num {
  color: var(--ao-cyan);
  font-size: 14px;
}

/* ---------- 03 数据流程 ---------- */

.page-about .about-pipe__stage {
  position: relative;
  overflow: hidden;
  padding: clamp(20px, 4vw, 44px) clamp(12px, 3vw, 30px);
  border: 1px solid var(--ao-700);
  border-radius: var(--radius);
  background: var(--ao-900);
}

.page-about .about-pipe__bg {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: .2;
  z-index: 0;
}

.page-about .about-pipe__stage::after {
  content: "";
  position: absolute;
  inset: 0;
  z-index: 1;
  background: radial-gradient(82% 130% at 50% 0%, rgba(8, 10, 13, .5), var(--ao-900) 76%);
}

.page-about .about-pipe__svg {
  position: relative;
  z-index: 2;
  display: block;
  width: 100%;
  max-width: 1000px;
  height: auto;
  margin: 0 auto;
}

.page-about .about-pipe__axis {
  stroke: rgba(53, 214, 224, .38);
  stroke-width: 2;
}

.page-about .about-pipe__node {
  fill: var(--ao-800);
  stroke: var(--ao-cyan);
  stroke-width: 2;
}

.page-about .about-pipe__node--live {
  stroke: var(--ao-green);
}

.page-about .about-pipe__idx {
  fill: var(--ao-ink);
  font-family: var(--font-mono);
  font-size: 15px;
  font-weight: 700;
  text-anchor: middle;
  dominant-baseline: middle;
}

.page-about .about-pipe__label {
  fill: var(--ao-muted);
  font-family: var(--font-body);
  font-size: 15px;
  text-anchor: middle;
}

.page-about .about-pipe__steps {
  list-style: none;
  margin: clamp(18px, 3vw, 30px) 0 0;
  padding: 0;
  display: grid;
  gap: 14px;
  counter-reset: none;
}

.page-about .about-pipe__step {
  padding: 14px 16px 16px;
  background: rgba(23, 27, 33, .72);
  border: 1px solid var(--ao-700);
  border-radius: var(--radius);
}

.page-about .about-pipe__step-no {
  display: inline-block;
  margin-bottom: 8px;
  font-size: 12px;
  letter-spacing: .14em;
  color: var(--ao-cyan);
}

.page-about .about-pipe__step h3 {
  margin: 0 0 6px;
  font-family: var(--font-display);
  font-size: 17px;
  font-weight: 700;
  color: var(--ao-ink);
}

.page-about .about-pipe__step p {
  margin: 0;
  font-size: 13.5px;
  line-height: 1.75;
  color: var(--ao-muted);
}

.page-about .about-pipe__caliber {
  margin-top: clamp(16px, 2.4vw, 24px);
  padding: 14px 16px;
  border-left: 3px solid var(--ao-amber);
  background: rgba(245, 165, 36, .07);
  border-radius: 0 var(--radius) var(--radius) 0;
}

.page-about .about-pipe__caliber p {
  margin: 0;
  font-size: 13px;
  line-height: 1.8;
  color: var(--ao-muted);
}

.page-about .about-pipe__caliber strong {
  color: var(--ao-amber);
  font-weight: 700;
}

/* ---------- 04 团队 ---------- */

.page-about .about-team__layout {
  display: grid;
  gap: clamp(22px, 3.5vw, 42px);
}

.page-about .about-team__centers {
  display: grid;
  gap: 14px;
  align-content: start;
}

.page-about .about-center {
  padding: 16px 18px 18px;
  background: var(--ao-800);
  border: 1px solid var(--ao-700);
  border-top: 3px solid var(--ao-red);
  border-radius: var(--radius);
}

.page-about .about-center__city {
  display: inline-block;
  margin: 0 0 8px;
  padding: 2px 8px;
  font-size: 12px;
  letter-spacing: .16em;
  color: var(--ao-ink);
  background: rgba(200, 16, 46, .85);
  border-radius: var(--radius);
}

.page-about .about-center h3 {
  margin: 0 0 8px;
  font-family: var(--font-display);
  font-size: 20px;
  font-weight: 700;
  color: var(--ao-ink);
}

.page-about .about-center p {
  margin: 0;
  font-size: 13.5px;
  line-height: 1.8;
  color: var(--ao-muted);
}

.page-about .about-center__link {
  margin-top: 12px;
  font-size: 13px;
}

.page-about .about-center__link a {
  color: var(--ao-cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(53, 214, 224, .45);
}

.page-about .about-center__link a:hover,
.page-about .about-center__link a:focus-visible {
  border-bottom-color: var(--ao-cyan);
  color: var(--ao-ink);
}

.page-about .about-team__chart {
  padding: 18px 18px 16px;
  background: var(--ao-900);
  border: 1px solid var(--ao-700);
  border-radius: var(--radius);
}

.page-about .about-team__chart-title {
  margin: 0 0 14px;
  font-family: var(--font-display);
  font-size: 17px;
  font-weight: 700;
  color: var(--ao-ink);
  letter-spacing: .02em;
}

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

.page-about .about-team__row {
  display: grid;
  grid-template-columns: 5.2rem minmax(0, 1fr) 2.6rem;
  align-items: center;
  gap: 12px;
  padding: 7px 0;
}

.page-about .about-team__name {
  font-size: 14px;
  color: var(--ao-ink);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.page-about .about-team__track {
  position: relative;
  display: block;
  height: 10px;
  background: var(--ao-800);
  border: 1px solid var(--ao-700);
  border-radius: var(--radius);
  overflow: hidden;
  outline: none;
}

.page-about .about-team__track:focus-visible {
  box-shadow: 0 0 0 2px var(--ao-cyan);
}

.page-about .about-team__fill {
  display: block;
  height: 100%;
  width: var(--w, 0%);
  background: linear-gradient(90deg, rgba(200, 16, 46, .9), rgba(53, 214, 224, .85));
  border-radius: 1px;
}

.page-about .about-team__count {
  font-size: 14px;
  text-align: right;
  color: var(--ao-ink);
}

.page-about .about-team__foot {
  margin: 14px 0 0;
  font-size: 12.5px;
  line-height: 1.65;
  color: var(--ao-muted);
}

/* ---------- 05 内容节奏 ---------- */

.page-about .about-rhythm__list {
  list-style: none;
  margin: 0 0 clamp(18px, 2.6vw, 26px);
  padding: 0;
  display: grid;
  gap: 0;
  border-top: 1px solid var(--ao-800);
}

.page-about .about-rhythm__list li {
  padding: 16px 0 16px 1.4rem;
  border-bottom: 1px solid var(--ao-800);
  position: relative;
}

.page-about .about-rhythm__list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 1.65rem;
  width: 8px;
  height: 2px;
  background: var(--ao-green);
}

.page-about .about-rhythm__list h3 {
  margin: 0 0 6px;
  font-family: var(--font-display);
  font-size: 17px;
  font-weight: 700;
  color: var(--ao-ink);
}

.page-about .about-rhythm__list p {
  margin: 0;
  font-size: 13.5px;
  line-height: 1.8;
  color: var(--ao-muted);
}

.page-about .about-rhythm__tags {
  list-style: none;
  margin: 0 0 14px;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.page-about .about-rhythm__tags li {
  padding: 5px 11px;
  font-size: 12.5px;
  letter-spacing: .06em;
  color: var(--ao-ink);
  background: rgba(255, 255, 255, .05);
  border: 1px solid var(--ao-glass-line);
  border-radius: var(--radius);
}

.page-about .about-rhythm__more {
  margin: 0;
  font-size: 13.5px;
  color: var(--ao-muted);
}

.page-about .about-rhythm__more a {
  color: var(--ao-cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(53, 214, 224, .45);
}

.page-about .about-rhythm__more a:hover,
.page-about .about-rhythm__more a:focus-visible {
  color: var(--ao-ink);
  border-bottom-color: var(--ao-cyan);
}

/* ---------- 06 合规 ---------- */

.page-about .about-compliance__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 12px;
}

.page-about .about-compliance__list li {
  padding: 15px 16px;
  background: var(--ao-800);
  border: 1px solid var(--ao-700);
  border-radius: var(--radius);
}

.page-about .about-compliance__list strong {
  display: block;
  margin-bottom: 6px;
  font-family: var(--font-display);
  font-size: 16px;
  font-weight: 700;
  color: var(--ao-ink);
  letter-spacing: .02em;
}

.page-about .about-compliance__list p {
  margin: 0;
  font-size: 13.5px;
  line-height: 1.8;
  color: var(--ao-muted);
}

.page-about .about-compliance__list a {
  color: var(--ao-cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(53, 214, 224, .45);
}

.page-about .about-compliance__list a:hover,
.page-about .about-compliance__list a:focus-visible {
  color: var(--ao-ink);
  border-bottom-color: var(--ao-cyan);
}

/* ---------- 链接与焦点统一 ---------- */

.page-about a:focus-visible,
.page-about [tabindex]:focus-visible {
  outline: 2px solid var(--ao-cyan);
  outline-offset: 3px;
}

.page-about .num {
  font-family: var(--font-mono);
  font-weight: 700;
  font-variant-numeric: tabular-nums;
}

/* ---------- 媒体查询：窄屏兜底 ---------- */

@media (max-width: 599px) {
  .page-about .about-timeline__body em {
    max-height: 6em;
    opacity: 1;
    margin-top: 5px;
  }

  .page-about .about-team__row {
    grid-template-columns: 4.4rem minmax(0, 1fr) 2.2rem;
    gap: 9px;
  }

  .page-about .about-region-card__data > div {
    grid-template-columns: 4.4rem minmax(0, 1fr);
    gap: 8px;
  }
}

/* ---------- 媒体查询：>= 560px ---------- */

@media (min-width: 560px) {
  .page-about .about-region-list {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

/* ---------- 媒体查询：>= 720px ---------- */

@media (min-width: 720px) {
  .page-about .about-pipe__steps {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

/* ---------- 媒体查询：>= 900px ---------- */

@media (min-width: 900px) {
  .page-about .about-origin__grid {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1.05fr);
    align-items: start;
  }

  .page-about .about-team__layout {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1.05fr);
    align-items: start;
  }
}

/* ---------- 媒体查询：>= 980px ---------- */

@media (min-width: 980px) {
  .page-about .about-regions__layout {
    grid-template-columns: minmax(0, 300px) minmax(0, 1fr);
    align-items: start;
  }

  .page-about .about-regions__figure {
    position: sticky;
    top: 108px;
  }

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

/* ---------- 减少动效 ---------- */

@media (prefers-reduced-motion: reduce) {
  .page-about .about-timeline__item::before,
  .page-about .about-timeline__body em,
  .page-about .about-region-card,
  .page-about .about-team__fill {
    transition: none !important;
  }

  .page-about .about-team__fill {
    width: var(--w, 0%);
  }
}

.page-about {
  --w: 1rem;
}