.page-about {
  --about-axis: 2rem;
  --about-glow: rgba(200, 255, 77, .14);
  display: block;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  padding-block: clamp(1.75rem, 5vw, 3.5rem) clamp(2.5rem, 7vw, 5rem);
  overflow: hidden;
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  top: -25%;
  right: -8%;
  width: min(34rem, 78vw);
  height: min(34rem, 78vw);
  background: radial-gradient(circle at 50% 50%, var(--about-glow), transparent 62%);
  pointer-events: none;
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 1px;
  background: linear-gradient(90deg, transparent, rgba(200, 255, 77, .38), transparent);
}

.page-about .about-hero__grid {
  position: relative;
  display: grid;
  gap: 2.25rem;
  align-items: start;
}

.page-about .about-hero__lead {
  position: relative;
}

.page-about .about-hero__lead .note-vertical {
  display: none;
}

.page-about .about-hero h1 {
  margin: .55rem 0 0;
  font-family: var(--font-heading);
  font-size: clamp(2.15rem, 6.6vw, 4.2rem);
  line-height: 1.04;
  letter-spacing: -.015em;
  color: var(--paper);
}

.page-about .about-hero .lede {
  margin-top: 1.15rem;
}

.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: .75rem;
  margin-top: 1.65rem;
}

.page-about .about-hero__board {
  position: relative;
  padding: 1.35rem 1.2rem 1.25rem;
  border: 1px solid var(--line);
  border-radius: var(--radius-panel);
  background: linear-gradient(158deg, rgba(18, 63, 55, .94), rgba(6, 26, 23, .94));
  box-shadow: var(--shadow-panel);
  overflow: hidden;
}

.page-about .about-hero__board::after {
  content: "";
  position: absolute;
  right: -28%;
  bottom: -58%;
  width: 17rem;
  height: 17rem;
  border-radius: 50%;
  border: 1px solid rgba(200, 255, 77, .2);
  pointer-events: none;
}

.page-about .about-hero__badge {
  display: inline-block;
  font-size: .7rem;
  letter-spacing: .14em;
  text-transform: uppercase;
  color: var(--lime);
  padding: .32rem .7rem;
  border: 1px solid var(--line);
  border-radius: 999px;
}

.page-about .about-kv {
  margin: 1.15rem 0 0;
  display: grid;
  gap: .1rem;
}

.page-about .about-kv > div {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 1rem;
  padding: .68rem 0;
  border-bottom: 1px dashed rgba(143, 181, 168, .24);
}

.page-about .about-kv > div:last-child {
  border-bottom: 0;
}

.page-about .about-kv dt {
  margin: 0;
  font-size: .85rem;
  color: var(--mist);
}

.page-about .about-kv dd {
  margin: 0;
  font-family: var(--font-mono);
  font-size: .95rem;
  color: var(--paper);
  text-align: right;
}

.page-about .about-hero__foot {
  margin: 1rem 0 0;
  font-size: .78rem;
  letter-spacing: .08em;
  color: var(--mist);
}

/* ---------- 业务范围 ---------- */
.page-about .about-position {
  padding-block: clamp(2.5rem, 6vw, 4.75rem);
}

.page-about .about-position__grid {
  display: grid;
  gap: 2.25rem;
}

.page-about .about-position__intro h2 {
  margin: .5rem 0 0;
  font-family: var(--font-heading);
  font-size: clamp(1.7rem, 4vw, 2.6rem);
  line-height: 1.12;
  color: var(--paper);
}

.page-about .about-position__intro .prose {
  margin-top: 1.1rem;
}

.page-about .about-position__cards {
  display: grid;
  gap: 1rem;
  align-content: start;
}

.page-about .about-position__cards .panel {
  transition: transform .26s ease, border-color .26s ease, box-shadow .26s ease;
}

.page-about .about-position__cards .panel:hover,
.page-about .about-position__cards .panel:focus-within {
  transform: translateY(-4px);
  box-shadow: 0 22px 42px -34px rgba(0, 0, 0, .95);
}

.page-about .about-position__cards .panel p {
  margin: 0;
  color: var(--mist);
  line-height: 1.7;
  font-size: .95rem;
}

/* ---------- 数据覆盖 ---------- */
.page-about .about-coverage {
  position: relative;
  padding-block: clamp(2.5rem, 6vw, 5rem);
}

.page-about .about-coverage__grid {
  margin-top: 2rem;
  display: grid;
  gap: 1.75rem;
}

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

.page-about .about-leagues__bar {
  display: flex;
  flex-wrap: wrap;
  gap: .5rem;
  margin-bottom: 1.35rem;
}

.page-about .about-leagues__bar .tab {
  font-family: var(--font-heading);
  font-size: .95rem;
  letter-spacing: .04em;
  padding: .36rem 1rem;
  border-radius: 999px;
  border: 1px solid var(--line-soft);
  background: transparent;
  color: var(--mist);
  cursor: pointer;
  transition: color .2s ease, background .2s ease, border-color .2s ease;
}

.page-about .about-leagues__bar .tab:hover {
  color: var(--paper);
  border-color: var(--lime);
}

.page-about .about-leagues__bar .tab[aria-selected="true"] {
  color: var(--night);
  background: var(--lime);
  border-color: var(--lime);
}

.page-about .about-leagues__bar .tab:focus-visible {
  outline: 2px solid var(--lime);
  outline-offset: 3px;
}

.page-about .about-leagues .tab-panel {
  padding: 1.35rem 1.2rem 1.25rem;
  border: 1px solid var(--line);
  border-radius: var(--radius-soft);
  background: linear-gradient(150deg, rgba(18, 63, 55, .72), rgba(10, 46, 40, .48));
}

.page-about .about-leagues .tab-panel[hidden] {
  display: none;
}

.page-about .about-leagues__title {
  margin: 0;
  font-family: var(--font-heading);
  font-size: clamp(1.15rem, 2.6vw, 1.45rem);
  line-height: 1.24;
  color: var(--paper);
}

.page-about .about-leagues__text {
  margin: .7rem 0 0;
  color: var(--mist);
  line-height: 1.75;
  max-width: 56ch;
}

.page-about .about-leagues__tags {
  display: flex;
  flex-wrap: wrap;
  gap: .45rem;
  margin: 1rem 0 0;
}

.page-about .about-scale {
  margin-top: 2.25rem;
}

.page-about .about-scale__track {
  position: relative;
  height: 2.4rem;
  border-bottom: 2px solid rgba(200, 255, 77, .35);
  background-image: repeating-linear-gradient(to right, rgba(143, 181, 168, .42) 0 1px, transparent 1px calc(100% / 25));
}

.page-about .about-scale__track::after {
  content: "";
  position: absolute;
  right: 0;
  bottom: -5px;
  width: .55rem;
  height: .55rem;
  border-radius: 50%;
  background: var(--lime);
  box-shadow: 0 0 0 4px rgba(200, 255, 77, .18);
}

.page-about .about-scale__labels {
  display: flex;
  justify-content: space-between;
  gap: .5rem;
  margin-top: .55rem;
  font-size: .72rem;
  color: var(--mist);
}

/* ---------- 发展历程 ---------- */
.page-about .about-history {
  padding-block: clamp(2.5rem, 6vw, 5rem);
}

.page-about .about-history__figure {
  margin: 2rem 0 2.75rem;
}

.page-about .about-timeline {
  position: relative;
  list-style: none;
  margin: 0 0 0 .35rem;
  padding: 0 0 0 1.75rem;
  border-left: 1px solid var(--line-soft);
}

.page-about .about-timeline__item {
  position: relative;
  padding: .25rem 0 2.1rem;
  transition: transform .28s ease;
}

.page-about .about-timeline__item:last-child {
  padding-bottom: .5rem;
}

.page-about .about-timeline__item::before {
  content: "";
  position: absolute;
  left: calc(-1.75rem - .36rem);
  top: .72rem;
  width: .72rem;
  height: .72rem;
  border-radius: 50%;
  background: var(--night);
  border: 2px solid var(--lime);
  transition: box-shadow .25s ease, background .25s ease;
}

.page-about .about-timeline__item:hover,
.page-about .about-timeline__item:focus-within {
  transform: translateX(4px);
}

.page-about .about-timeline__item:hover::before,
.page-about .about-timeline__item:focus-within::before {
  background: var(--lime);
  box-shadow: 0 0 0 6px rgba(200, 255, 77, .14);
}

.page-about .about-timeline__stage {
  margin: 0;
  font-size: .72rem;
  letter-spacing: .16em;
  text-transform: uppercase;
  color: var(--lime);
}

.page-about .about-timeline__title {
  margin: .3rem 0 .45rem;
  font-family: var(--font-heading);
  font-size: clamp(1.15rem, 2.4vw, 1.55rem);
  line-height: 1.22;
  color: var(--paper);
}

.page-about .about-timeline__text {
  margin: 0;
  color: var(--mist);
  line-height: 1.78;
  max-width: 62ch;
}

/* ---------- 团队与流程 ---------- */
.page-about .about-team {
  padding-block: clamp(2.5rem, 6vw, 5rem);
}

.page-about .about-team__grid {
  margin-top: 2rem;
  display: grid;
  gap: 1.75rem;
}

.page-about .about-team__roles {
  display: grid;
  gap: 1rem;
  align-content: start;
}

.page-about .about-team__roles .panel p {
  margin: 0;
  color: var(--mist);
  line-height: 1.72;
  font-size: .95rem;
}

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

.page-about .about-flow {
  list-style: none;
  counter-reset: flow;
  margin: 2.5rem 0 0;
  padding: 0;
  display: grid;
  gap: .9rem;
}

.page-about .about-flow__item {
  counter-increment: flow;
  padding: 1.05rem 1rem 1.15rem;
  border-top: 2px solid var(--line);
  background: linear-gradient(180deg, rgba(18, 63, 55, .5), transparent 88%);
  transition: border-color .24s ease, transform .24s ease;
}

.page-about .about-flow__item::before {
  content: "0" counter(flow);
  display: block;
  margin-bottom: .5rem;
  font-family: var(--font-mono);
  font-size: .76rem;
  letter-spacing: .12em;
  color: var(--lime);
}

.page-about .about-flow__item:hover,
.page-about .about-flow__item:focus-within {
  border-top-color: var(--lime);
  transform: translateY(-3px);
}

.page-about .about-flow__title {
  margin: 0 0 .35rem;
  font-family: var(--font-heading);
  font-size: 1.02rem;
  letter-spacing: .02em;
  color: var(--paper);
}

.page-about .about-flow__item p {
  margin: 0;
  font-size: .87rem;
  line-height: 1.65;
  color: var(--mist);
}

/* ---------- 合作生态 ---------- */
.page-about .about-partners {
  padding-block: clamp(2.5rem, 6vw, 5rem);
}

.page-about .about-partners__grid {
  display: grid;
  gap: 2.25rem;
}

.page-about .about-partners__intro h2 {
  margin: .5rem 0 0;
  font-family: var(--font-heading);
  font-size: clamp(1.7rem, 4vw, 2.55rem);
  line-height: 1.12;
  color: var(--paper);
}

.page-about .about-partners__intro .prose {
  margin-top: 1.05rem;
}

.page-about .about-partners__actions {
  display: flex;
  flex-wrap: wrap;
  gap: .75rem;
  margin-top: 1.6rem;
}

.page-about .about-partners__stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: .9rem;
  align-content: start;
}

.page-about .about-metric {
  position: relative;
  display: grid;
  gap: .3rem;
  padding: 1.15rem 1rem 1.2rem;
  border: 1px solid var(--line);
  border-radius: var(--radius-soft);
  background: linear-gradient(160deg, rgba(18, 63, 55, .78), rgba(6, 26, 23, .6));
  overflow: hidden;
}

.page-about .about-metric::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 3px;
  height: 100%;
  background: var(--lime);
}

.page-about .about-metric--blue::before { background: var(--blue); }
.page-about .about-metric--orange::before { background: var(--orange); }
.page-about .about-metric--rose::before { background: var(--rose); }

.page-about .about-metric__num {
  font-size: clamp(1.7rem, 5vw, 2.3rem);
  line-height: 1;
  color: var(--paper);
}

.page-about .about-metric__label {
  font-size: .82rem;
  letter-spacing: .04em;
  color: var(--mist);
}

/* ---------- 收尾行动 ---------- */
.page-about .about-cta__inner {
  display: grid;
  gap: 1.5rem;
  padding: clamp(1.6rem, 4vw, 2.6rem);
  border: 1px solid var(--line);
  border-radius: var(--radius-panel);
  background:
    radial-gradient(120% 150% at 0% 0%, rgba(200, 255, 77, .15), transparent 56%),
    linear-gradient(140deg, rgba(18, 63, 55, .92), rgba(6, 26, 23, .92));
  box-shadow: var(--shadow-panel);
}

.page-about .about-cta__inner h2 {
  margin: 0;
  font-family: var(--font-heading);
  font-size: clamp(1.5rem, 3.6vw, 2.15rem);
  line-height: 1.14;
  color: var(--paper);
}

.page-about .about-cta__inner p {
  margin: .8rem 0 0;
  color: var(--mist);
  line-height: 1.75;
  max-width: 54ch;
}

.page-about .about-cta__actions {
  display: flex;
  flex-wrap: wrap;
  gap: .75rem;
  align-content: center;
}

.page-about .media-frame img {
  max-width: 100%;
  height: auto;
  display: block;
  object-fit: cover;
}

/* ---------- 响应式 ---------- */
@media (min-width: 640px) {
  .page-about .about-position__cards {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

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

@media (min-width: 900px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 1.1fr) minmax(0, .9fr);
    gap: 3.25rem;
  }

  .page-about .about-position__grid {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, .95fr);
    gap: 3rem;
  }

  .page-about .about-coverage__grid {
    grid-template-columns: minmax(0, .82fr) minmax(0, 1.18fr);
    gap: 2.75rem;
    align-items: start;
  }

  .page-about .about-team__grid {
    grid-template-columns: minmax(0, .95fr) minmax(0, 1.05fr);
    gap: 2.75rem;
    align-items: start;
  }

  .page-about .about-partners__grid {
    grid-template-columns: minmax(0, 1.15fr) minmax(0, .85fr);
    gap: 3rem;
    align-items: start;
  }

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

  .page-about .about-timeline {
    padding-left: 3rem;
  }

  .page-about .about-timeline__item::before {
    left: calc(-3rem - .36rem);
  }
}

@media (min-width: 1024px) {
  .page-about .about-cta__inner {
    grid-template-columns: minmax(0, 1.35fr) auto;
    align-items: center;
    gap: 2.5rem;
  }
}

@media (min-width: 1100px) {
  .page-about .about-hero__lead {
    padding-left: 3rem;
  }

  .page-about .about-hero__lead .note-vertical {
    display: block;
    position: absolute;
    left: 0;
    top: 4.4rem;
  }
}

@media (max-width: 380px) {
  .page-about .about-scale__labels {
    font-size: .64rem;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-position__cards .panel,
  .page-about .about-timeline__item,
  .page-about .about-flow__item {
    transition: none;
  }

  .page-about .about-position__cards .panel:hover,
  .page-about .about-position__cards .panel:focus-within,
  .page-about .about-timeline__item:hover,
  .page-about .about-timeline__item:focus-within,
  .page-about .about-flow__item:hover,
  .page-about .about-flow__item:focus-within {
    transform: none;
  }
}