.page-about {
  --about-pad: clamp(56px, 8vw, 112px);
  --about-gap: clamp(18px, 2.6vw, 32px);
  --about-maxw: 1240px;
  background: var(--ink);
  color: var(--paper);
}

.page-about .container {
  width: 100%;
  max-width: var(--maxw);
  margin-inline: auto;
  padding-inline: var(--pad-x);
}

.page-about .section--paper,
.page-about .about-data,
.page-about .about-team {
  color: var(--black);
}

/* ---------- 通用排版件 ---------- */

.page-about .about-h2 {
  margin: 14px 0 16px;
  font-size: clamp(24px, 3.1vw, 40px);
  font-weight: 800;
  line-height: 1.22;
  letter-spacing: -0.01em;
  max-width: 22em;
}

.page-about .about-h3 {
  margin: 0 0 8px;
  font-size: clamp(16px, 1.5vw, 19px);
  font-weight: 700;
  line-height: 1.4;
}

.page-about .about-lede {
  max-width: 68ch;
  margin: 0 0 clamp(24px, 3.4vw, 40px);
  font-size: clamp(15px, 1.35vw, 17px);
  font-weight: 300;
  line-height: 1.8;
  color: rgba(244, 247, 248, 0.78);
}

.page-about .section--paper .about-lede,
.page-about .about-data .about-lede,
.page-about .about-team .about-lede {
  color: #35414c;
}

.page-about .eyebrow {
  position: relative;
  display: flex;
  align-items: center;
  gap: 14px;
  margin: 0;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--cyan);
}

.page-about .eyebrow::after {
  content: "";
  flex: 0 1 180px;
  height: 1px;
  background: linear-gradient(90deg, var(--line), transparent);
}

.page-about .section--paper .eyebrow,
.page-about .about-data .eyebrow,
.page-about .about-team .eyebrow {
  color: #0b6d67;
}

.page-about .section--paper .eyebrow::after,
.page-about .about-data .eyebrow::after,
.page-about .about-team .eyebrow::after {
  background: linear-gradient(90deg, rgba(11, 109, 103, 0.5), transparent);
}

/* ---------- 01 首屏 ---------- */

.page-about .about-intro {
  position: relative;
  padding: clamp(26px, 4vw, 44px) 0 clamp(48px, 6vw, 76px);
  overflow: hidden;
}

.page-about .about-intro::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(to right, rgba(14, 58, 92, 0.5) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(14, 58, 92, 0.28) 1px, transparent 1px);
  background-size: 96px 96px, 96px 96px;
  mask-image: linear-gradient(180deg, rgba(0, 0, 0, 0.85), transparent 78%);
  -webkit-mask-image: linear-gradient(180deg, rgba(0, 0, 0, 0.85), transparent 78%);
  pointer-events: none;
}

.page-about .about-intro > .container {
  position: relative;
  z-index: 1;
}

.page-about .breadcrumb {
  margin-bottom: clamp(26px, 4vw, 44px);
}

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

.page-about .about-intro__title {
  margin: 12px 0 20px;
  font-size: clamp(29px, 4.6vw, 54px);
  font-weight: 800;
  line-height: 1.16;
  letter-spacing: -0.02em;
  max-width: 16em;
}

.page-about .about-intro__lede {
  max-width: 60ch;
  margin: 0 0 26px;
  font-size: clamp(15px, 1.4vw, 17px);
  font-weight: 300;
  line-height: 1.85;
  color: rgba(244, 247, 248, 0.8);
}

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

.page-about .about-facts {
  align-self: start;
  padding: clamp(18px, 2.4vw, 26px);
  border: 1px solid var(--line);
  border-radius: var(--radius-m);
  background:
    radial-gradient(120% 120% at 100% 0%, rgba(0, 229, 208, 0.1), transparent 58%),
    var(--ink-2);
  box-shadow: inset 0 0 0 1px rgba(0, 229, 208, 0.06);
}

.page-about .about-facts__title {
  margin: 0 0 6px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.16em;
  color: var(--cyan-soft);
}

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

.page-about .about-facts__row {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 14px;
  padding: 11px 0;
  border-bottom: 1px solid rgba(14, 58, 92, 0.85);
}

.page-about .about-facts__row:last-child {
  border-bottom: 0;
  padding-bottom: 2px;
}

.page-about .about-facts__key {
  font-size: 13px;
  color: var(--gray);
}

.page-about .about-facts__val {
  font-family: var(--font-mono);
  font-size: 16px;
  font-weight: 700;
  color: var(--cyan);
  white-space: nowrap;
}

/* ---------- 02 时间轴 ---------- */

.page-about .about-timeline {
  position: relative;
  padding: var(--about-pad) 0;
  border-top: 1px solid var(--line);
  overflow: hidden;
}

.page-about .about-timeline__bg {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: 0.15;
  filter: saturate(0.55);
  pointer-events: none;
}

.page-about .about-timeline__inner {
  position: relative;
  z-index: 1;
}

.page-about .about-timeline__spine {
  position: relative;
  display: grid;
  gap: 0;
  margin-left: 6px;
}

.page-about .tl {
  position: relative;
  margin-left: 10px;
  padding-left: clamp(20px, 3vw, 34px);
  border-left: 1px solid var(--line);
}

.page-about .tl:last-child {
  border-left-color: transparent;
}

.page-about .tl__head {
  position: relative;
  display: block;
  padding: clamp(16px, 2.2vw, 22px) 0;
  cursor: pointer;
  list-style: none;
}

.page-about .tl__head::-webkit-details-marker {
  display: none;
}

.page-about .tl__head::before {
  content: "";
  position: absolute;
  top: 50%;
  left: calc(clamp(20px, 3vw, 34px) * -1 - 5px);
  width: 9px;
  height: 9px;
  transform: translateY(-50%) rotate(45deg);
  border: 1px solid var(--line);
  background: var(--ink);
  transition: background 200ms var(--ease), border-color 200ms var(--ease);
}

.page-about .tl[open] > .tl__head::before {
  background: var(--cyan);
  border-color: var(--cyan);
  box-shadow: 0 0 0 4px rgba(0, 229, 208, 0.16);
}

.page-about .tl__head:hover::before {
  border-color: var(--cyan);
}

.page-about .tl__head:focus-visible {
  outline: 2px solid var(--cyan);
  outline-offset: 4px;
  border-radius: var(--radius-s);
}

.page-about .tl__phase {
  display: block;
  margin-bottom: 8px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.12em;
  color: var(--cyan-soft);
}

.page-about .tl__title {
  display: block;
  font-size: clamp(17px, 2vw, 24px);
  font-weight: 700;
  line-height: 1.4;
  color: var(--paper);
}

.page-about .tl__body {
  padding: 0 0 clamp(20px, 2.6vw, 30px);
  max-width: 66ch;
}

.page-about .tl__body p {
  margin: 0 0 14px;
  font-size: 15px;
  font-weight: 300;
  line-height: 1.85;
  color: rgba(244, 247, 248, 0.76);
}

.page-about .tl__tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 16px 0 0;
  padding: 0;
  list-style: none;
}

.page-about .tl__tags li {
  padding: 4px 10px;
  border: 1px solid var(--line);
  border-radius: 999px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.06em;
  color: var(--cyan-soft);
}

/* ---------- 03 数据能力 ---------- */

.page-about .about-data {
  padding: var(--about-pad) 0;
}

.page-about .about-data__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(24px, 4vw, 56px);
  align-items: start;
}

.page-about .about-flow {
  display: grid;
  grid-template-columns: 1fr;
  gap: 12px;
  margin: 0 0 24px;
  padding: 0;
  list-style: none;
}

.page-about .about-flow__step {
  position: relative;
  display: grid;
  gap: 4px;
  padding: 16px 18px 18px;
  border: 1px solid rgba(14, 58, 92, 0.28);
  border-left: 3px solid var(--orange);
  border-radius: var(--radius-s);
  background: #ffffff;
}

.page-about .about-flow__num {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.12em;
  color: var(--gray);
}

.page-about .about-flow__name {
  font-size: 16px;
  font-weight: 700;
  color: var(--black);
}

.page-about .about-flow__desc {
  font-size: 13.5px;
  font-weight: 300;
  line-height: 1.7;
  color: #4b5763;
}

.page-about .about-data__note {
  padding: 18px 20px;
  border-radius: var(--radius-m);
  background: linear-gradient(135deg, rgba(255, 107, 26, 0.16), rgba(255, 178, 122, 0.28));
  border: 1px solid rgba(255, 107, 26, 0.28);
}

.page-about .about-data__note p {
  margin: 0;
  font-size: 14.5px;
  font-weight: 300;
  line-height: 1.8;
  color: #2c3843;
}

.page-about .about-data__note strong {
  font-family: var(--font-mono);
  font-weight: 700;
  color: #a63d00;
}

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

.page-about .about-data__media img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 4 / 3;
  object-fit: cover;
  border-radius: var(--radius-m);
}

/* ---------- 04 赛事覆盖 ---------- */

.page-about .about-leagues {
  padding: var(--about-pad) 0 0;
  border-top: 1px solid var(--line);
}

.page-about .about-leagues__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 10px;
  margin-bottom: clamp(28px, 4vw, 48px);
}

.page-about .about-league {
  border: 1px solid var(--line);
  border-radius: var(--radius-s);
  background: var(--ink-2);
  transition: border-color 200ms var(--ease), background 200ms var(--ease);
}

.page-about .about-league:hover {
  border-color: rgba(0, 229, 208, 0.5);
}

.page-about .about-league[open] {
  border-color: rgba(0, 229, 208, 0.62);
  background: linear-gradient(160deg, rgba(0, 229, 208, 0.08), var(--ink-2) 62%);
}

.page-about .about-league__head {
  position: relative;
  display: flex;
  flex-direction: column;
  gap: 4px;
  padding: 15px 40px 15px 16px;
  cursor: pointer;
  list-style: none;
}

.page-about .about-league__head::-webkit-details-marker {
  display: none;
}

.page-about .about-league__head::after {
  content: "+";
  position: absolute;
  top: 50%;
  right: 16px;
  transform: translateY(-50%);
  font-family: var(--font-mono);
  font-size: 16px;
  color: var(--cyan);
  transition: transform 200ms var(--ease);
}

.page-about .about-league[open] > .about-league__head::after {
  content: "–";
}

.page-about .about-league__head:focus-visible {
  outline: 2px solid var(--cyan);
  outline-offset: 3px;
  border-radius: var(--radius-s);
}

.page-about .about-league__name {
  font-size: 16px;
  font-weight: 700;
  color: var(--paper);
}

.page-about .about-league__meta {
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.06em;
  color: var(--cyan-soft);
}

.page-about .about-league__body {
  margin: 0;
  padding: 0 16px 16px;
  font-size: 13.5px;
  font-weight: 300;
  line-height: 1.78;
  color: rgba(244, 247, 248, 0.72);
}

.page-about .about-leagues__media {
  margin: 0;
  padding-bottom: var(--about-pad);
}

.page-about .about-leagues__media img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 14 / 9;
  object-fit: cover;
  border-radius: var(--radius-m) var(--radius-m) var(--radius-l) var(--radius-s);
}

/* ---------- 05 团队 ---------- */

.page-about .about-team {
  padding: var(--about-pad) 0;
}

.page-about .about-team__chart {
  margin-bottom: clamp(28px, 4vw, 46px);
}

.page-about .about-team__bar {
  display: flex;
  height: 54px;
  border: 1px solid rgba(14, 58, 92, 0.22);
  border-radius: var(--radius-s);
  overflow: hidden;
  background: #e6ecef;
}

.page-about .about-team__seg {
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 0 10px;
  overflow: hidden;
  transition: filter 200ms var(--ease);
}

.page-about .about-team__seg:hover {
  filter: brightness(1.1);
}

.page-about .about-team__seg--core {
  flex: 0 0 38.1%;
  background: linear-gradient(135deg, var(--cyan), #0bbfb0);
  color: var(--ink);
}

.page-about .about-team__seg--rest {
  flex: 1 1 auto;
  background: linear-gradient(135deg, var(--ink-2), #12456b);
  color: var(--cyan-soft);
}

.page-about .about-team__seg-label {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.04em;
  white-space: nowrap;
}

.page-about .about-team__legend {
  display: grid;
  gap: 8px;
  margin: 14px 0 0;
  padding: 0;
  list-style: none;
  font-size: 13px;
  color: #4b5763;
}

.page-about .about-team__legend li {
  display: flex;
  align-items: center;
  gap: 8px;
}

.page-about .about-team__dot {
  width: 9px;
  height: 9px;
  flex: 0 0 auto;
  border-radius: 2px;
  transform: rotate(45deg);
}

.page-about .about-team__dot--core {
  background: var(--cyan);
}

.page-about .about-team__dot--rest {
  background: var(--ink-2);
}

.page-about .about-team__legend-note {
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--gray);
}

.page-about .about-team__cols {
  display: grid;
  grid-template-columns: 1fr;
  gap: 18px;
}

.page-about .about-team__col {
  padding: 20px;
  border-top: 2px solid var(--ink);
  background: rgba(4, 18, 31, 0.04);
  border-radius: 0 0 var(--radius-s) var(--radius-s);
}

.page-about .about-team__col p {
  margin: 0;
  font-size: 14px;
  font-weight: 300;
  line-height: 1.78;
  color: #414d58;
}

/* ---------- 06 服务准则 ---------- */

.page-about .about-commit {
  padding: var(--about-pad) 0;
  border-top: 1px solid var(--line);
  background:
    radial-gradient(90% 120% at 0% 0%, rgba(0, 229, 208, 0.09), transparent 55%),
    var(--ink);
}

.page-about .about-commit__list {
  display: grid;
  gap: 0;
  margin: 0 0 clamp(26px, 4vw, 40px);
  padding: 0;
  list-style: none;
}

.page-about .about-commit__item {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: clamp(16px, 3vw, 32px);
  padding: clamp(20px, 3vw, 30px) 0;
  border-bottom: 1px solid rgba(14, 58, 92, 0.9);
}

.page-about .about-commit__item:first-child {
  border-top: 1px solid rgba(14, 58, 92, 0.9);
}

.page-about .about-commit__num {
  font-family: var(--font-mono);
  font-size: clamp(20px, 2.4vw, 28px);
  font-weight: 700;
  line-height: 1;
  color: var(--cyan);
}

.page-about .about-commit__body p {
  margin: 0;
  max-width: 64ch;
  font-size: 14.5px;
  font-weight: 300;
  line-height: 1.85;
  color: rgba(244, 247, 248, 0.76);
}

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

/* ---------- 07 合作与认可 ---------- */

.page-about .about-partners {
  padding: var(--about-pad) 0;
  border-top: 1px solid var(--line);
}

.page-about .about-partners__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 14px;
  margin-bottom: clamp(24px, 3.4vw, 36px);
}

.page-about .about-partners__card {
  padding: 22px;
  border: 1px solid var(--line);
  border-radius: var(--radius-m);
  background: var(--ink-2);
}

.page-about .about-partners__num {
  display: block;
  margin-bottom: 10px;
  font-family: var(--font-mono);
  font-size: clamp(26px, 3vw, 38px);
  font-weight: 700;
  line-height: 1;
  color: var(--orange);
}

.page-about .about-partners__card p {
  margin: 0;
  font-size: 13.5px;
  font-weight: 300;
  line-height: 1.78;
  color: rgba(244, 247, 248, 0.72);
}

.page-about .about-partners__cta {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 16px;
  padding: clamp(20px, 3vw, 28px);
  border: 1px solid rgba(255, 107, 26, 0.34);
  border-radius: var(--radius-m);
  background: linear-gradient(120deg, rgba(255, 107, 26, 0.14), rgba(8, 36, 59, 0.9));
}

.page-about .about-partners__cta p {
  margin: 0;
  max-width: 58ch;
  font-size: 14.5px;
  font-weight: 300;
  line-height: 1.8;
  color: rgba(244, 247, 248, 0.84);
}

/* ---------- 响应式 ---------- */

@media (min-width: 600px) {
  .page-about .about-flow {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

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

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

  .page-about .about-partners__cta {
    flex-direction: row;
    align-items: center;
    justify-content: space-between;
  }

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

  .page-about .about-team__legend-note {
    grid-column: 1 / -1;
  }
}

@media (min-width: 900px) {
  .page-about .about-intro {
    padding-top: clamp(34px, 4vw, 56px);
    padding-bottom: clamp(56px, 7vw, 92px);
  }

  .page-about .about-intro__grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 4fr);
    column-gap: clamp(36px, 5vw, 80px);
    align-items: start;
  }

  .page-about .about-facts {
    margin-top: 52px;
  }

  .page-about .about-data__grid {
    grid-template-columns: minmax(0, 1.1fr) minmax(0, 1fr);
    gap: clamp(36px, 5vw, 72px);
    align-items: center;
  }

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

  .page-about .about-team__cols {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 20px;
  }

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

  .page-about .about-team__legend-note {
    grid-column: auto;
    text-align: right;
  }

  .page-about .about-commit__list {
    max-width: 980px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-league,
  .page-about .about-team__seg,
  .page-about .tl__head::before,
  .page-about .about-league__head::after {
    transition: none;
  }
}