.page-about {
  --about-bg-panel: rgba(27, 31, 42, 0.72);
  --about-line: rgba(247, 249, 252, 0.14);
  --about-neon: #C7FF36;
  --about-cyan: #00E5FF;
  --about-violet: #7B61FF;
  background: var(--bg-deep);
  color: var(--white);
}

/* ========== 首屏 ========== */
.page-about .about-hero {
  position: relative;
  padding: 40px 0 56px;
  border-bottom: 1px solid var(--border);
  overflow: hidden;
}

.page-about .about-hero__media {
  position: absolute;
  inset: 0;
  z-index: 0;
  opacity: 0.3;
}

.page-about .about-hero__media img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  filter: blur(3px) brightness(0.45) saturate(1.15);
  transform: scale(1.08);
}

.page-about .about-hero__media::after {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, rgba(11, 19, 43, 0.55) 0%, rgba(11, 19, 43, 0.82) 58%, var(--bg-deep) 100%);
}

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

.page-about .about-hero .breadcrumbs {
  margin-bottom: 40px;
}

.page-about .about-hero__grid {
  display: grid;
  gap: 28px;
}

.page-about .about-hero__aside {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 12px;
}

.page-about .about-hero__kicker {
  margin: 0 0 14px;
  font-family: var(--font-data);
  font-size: 13px;
  letter-spacing: 0.08em;
  color: var(--cyan);
  text-transform: uppercase;
}

.page-about .about-hero h1 {
  margin: 0 0 24px;
  font-size: clamp(28px, 5vw, 44px);
  line-height: 1.18;
  letter-spacing: -0.01em;
  font-weight: 800;
  max-width: 14em;
}

.page-about .about-hero .lede {
  margin: 0;
  max-width: 34em;
  font-size: 16px;
  line-height: 1.8;
  color: var(--grey);
}

.page-about .about-hero__index {
  margin-top: 48px;
  padding-top: 24px;
  border-top: 1px solid var(--about-line);
}

.page-about .about-hero__index .index__title {
  display: block;
  margin-bottom: 12px;
  font-size: 12px;
  letter-spacing: 0.12em;
  color: var(--grey);
}

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

.page-about .about-hero__index .index__link {
  display: inline-block;
  padding: 6px 12px;
  border: 1px solid var(--about-line);
  border-radius: 999px;
  font-size: 13px;
  color: var(--white);
  text-decoration: none;
  transition: border-color 0.25s ease, color 0.25s ease;
}

.page-about .about-hero__index .index__link:hover,
.page-about .about-hero__index .index__link:focus-visible {
  border-color: var(--about-neon);
  color: var(--about-neon);
  outline: none;
}

/* ========== 区块通用布局 ========== */
.page-about section[id] {
  scroll-margin-top: 80px;
}

.page-about .about-why,
.page-about .about-birth,
.page-about .about-leagues,
.page-about .about-batch,
.page-about .about-team {
  padding: 68px 0 72px;
  border-bottom: 1px solid var(--border);
}

.page-about .about-why__layout,
.page-about .about-birth__layout,
.page-about .about-leagues__head,
.page-about .about-batch__layout,
.page-about .about-team__layout {
  display: grid;
  gap: 28px;
}

.page-about .about-why__aside,
.page-about .about-birth__aside,
.page-about .about-leagues__aside,
.page-about .about-batch__aside,
.page-about .about-team__aside {
  display: flex;
  align-items: flex-start;
  gap: 14px;
}

.page-about .about-why__index,
.page-about .about-birth__index,
.page-about .about-leagues__index,
.page-about .about-batch__index,
.page-about .about-team__index {
  font-family: var(--font-data);
  font-size: 40px;
  line-height: 1;
  font-weight: 700;
  color: var(--about-neon);
  opacity: 0.9;
}

.page-about .about-why__main h2,
.page-about .about-birth__main h2,
.page-about .about-leagues__main h2,
.page-about .about-batch__main h2,
.page-about .about-team__main h2 {
  margin: 0 0 20px;
  font-size: clamp(26px, 3.4vw, 36px);
  line-height: 1.22;
  letter-spacing: -0.01em;
  font-weight: 800;
}

.page-about .about-why__main p,
.page-about .about-birth__main p,
.page-about .about-leagues__main p,
.page-about .about-batch__main p,
.page-about .about-team__main p {
  margin: 0 0 16px;
  font-size: 15px;
  line-height: 1.85;
  color: var(--grey);
}

.page-about .about-why__main p strong {
  color: var(--white);
  font-weight: 600;
}

/* ========== 01 为什么做 ========== */
.page-about .about-why {
  position: relative;
}

.page-about .about-why::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 1px;
  background: linear-gradient(90deg, var(--about-neon) 12%, transparent 42%);
  opacity: 0.5;
}

.page-about .about-why__quote {
  margin: 28px 0 24px;
  padding: 8px 0 8px 20px;
  border-left: 3px solid var(--about-neon);
  font-size: clamp(24px, 4vw, 34px);
  line-height: 1.35;
  font-weight: 800;
  color: var(--white);
  letter-spacing: -0.01em;
}

.page-about .about-why__quote-mark {
  color: var(--about-neon);
  margin-right: 2px;
}

.page-about .about-why__quote-note {
  display: block;
  margin-top: 10px;
  font-size: 13px;
  font-weight: 400;
  line-height: 1.6;
  color: var(--grey);
}

.page-about .about-why .note {
  margin-top: 24px;
}

/* ========== 02 精简版诞生与时间线 ========== */
.page-about .about-birth {
  position: relative;
}

.page-about .about-birth::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 1px;
  background: linear-gradient(100deg, transparent, rgba(0, 229, 255, 0.35), transparent);
}

.page-about .about-timeline {
  margin-top: 56px;
}

.page-about .about-timeline__head {
  display: flex;
  flex-direction: column;
  gap: 16px;
  margin-bottom: 36px;
}

.page-about .about-timeline__title {
  margin: 0;
  font-size: 18px;
  font-weight: 700;
  color: var(--white);
}

.page-about .about-timeline__rail {
  position: relative;
  padding-left: 24px;
}

.page-about .about-timeline__rail::before {
  content: '';
  position: absolute;
  top: 0;
  bottom: 0;
  left: 7px;
  width: 1px;
  background: linear-gradient(180deg, var(--about-cyan), var(--about-violet), transparent);
  opacity: 0.4;
}

.page-about .about-timeline__item {
  position: relative;
  padding-bottom: 40px;
}

.page-about .about-timeline__dot {
  position: absolute;
  left: -21px;
  top: 6px;
  width: 11px;
  height: 11px;
  border-radius: 50%;
  background: var(--about-cyan);
  box-shadow: 0 0 0 4px rgba(0, 229, 255, 0.12), 0 0 14px rgba(0, 229, 255, 0.45);
}

.page-about .about-timeline__card {
  background: var(--about-bg-panel);
  border: 1px solid var(--about-line);
  border-radius: 14px;
  padding: 22px 22px 20px;
  transition: border-color 0.25s ease, transform 0.25s ease, box-shadow 0.25s ease;
}

.page-about .about-timeline__card:hover {
  border-color: rgba(199, 255, 54, 0.35);
  transform: translateY(-2px);
  box-shadow: var(--shadow);
}

.page-about .about-timeline__year {
  font-family: var(--font-data);
  font-size: 14px;
  font-weight: 700;
  letter-spacing: 0.04em;
  color: var(--about-neon);
  display: inline-block;
  margin-bottom: 8px;
}

.page-about .about-timeline__card h4 {
  margin: 0 0 8px;
  font-size: 18px;
  font-weight: 700;
  color: var(--white);
}

.page-about .about-timeline__card p {
  margin: 0;
  font-size: 14px;
  line-height: 1.75;
  color: var(--grey);
}

.page-about .about-timeline__detail {
  margin-top: 14px;
  border-top: 1px dashed var(--about-line);
  padding-top: 12px;
}

.page-about .about-timeline__detail summary {
  font-size: 13px;
  font-weight: 600;
  color: var(--cyan);
  cursor: pointer;
  list-style: none;
}

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

.page-about .about-timeline__detail summary::before {
  content: '+ ';
  color: var(--about-neon);
  font-family: var(--font-data);
}

.page-about .about-timeline__detail[open] summary::before {
  content: '− ';
}

.page-about .about-timeline__detail p {
  margin: 10px 0 0;
  font-size: 13px;
  line-height: 1.7;
  color: var(--grey);
}

.page-about .about-timeline__media {
  margin-top: 12px;
  border-radius: 16px;
  overflow: hidden;
  border: 1px solid var(--about-line);
}

.page-about .about-timeline__media img {
  display: block;
  width: 100%;
  height: auto;
}

/* ========== 03 联赛覆盖 ========== */
.page-about .about-leagues {
  position: relative;
  background: linear-gradient(135deg, transparent 0%, rgba(123, 97, 255, 0.06) 50%, transparent 100%);
}

.page-about .about-leagues__stat {
  margin: 40px 0 48px;
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 4px;
  padding: 24px;
  background: linear-gradient(135deg, rgba(199, 255, 54, 0.08), rgba(0, 229, 255, 0.04));
  border: 1px solid var(--about-line);
  border-radius: 18px;
  max-width: 480px;
}

.page-about .about-leagues__number {
  font-family: var(--font-data);
  font-size: 72px;
  line-height: 1;
  font-weight: 800;
  color: var(--about-neon);
  letter-spacing: -0.03em;
}

.page-about .about-leagues__plus {
  font-size: 40px;
  vertical-align: top;
  margin-left: 4px;
  color: var(--about-cyan);
}

.page-about .about-leagues__caption {
  font-size: 15px;
  font-weight: 600;
  color: var(--white);
}

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

.page-about .about-leagues__filter-head {
  display: flex;
  flex-direction: column;
  gap: 12px;
  margin-bottom: 24px;
}

.page-about .about-leagues__regions {
  display: grid;
  gap: 16px;
  margin-bottom: 40px;
}

.page-about .about-leagues__region-card {
  background: var(--about-bg-panel);
  border: 1px solid var(--about-line);
  border-radius: 16px;
  padding: 24px;
  transition: border-color 0.25s ease, background 0.25s ease;
}

.page-about .about-leagues__region-card:hover {
  border-color: rgba(123, 97, 255, 0.5);
  background: rgba(123, 97, 255, 0.06);
}

.page-about .about-leagues__region-tag {
  display: inline-block;
  padding: 3px 10px;
  border-radius: 999px;
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.06em;
  background: rgba(123, 97, 255, 0.18);
  color: #b9a8ff;
  margin-bottom: 12px;
}

.page-about .about-leagues__region-card h3 {
  margin: 0 0 10px;
  font-size: 19px;
  font-weight: 700;
  color: var(--white);
}

.page-about .about-leagues__region-card p {
  margin: 0;
  font-size: 14px;
  line-height: 1.75;
  color: var(--grey);
}

.page-about .about-leagues__map {
  display: grid;
  gap: 20px;
  margin-bottom: 32px;
}

.page-about .about-leagues__map-img {
  border-radius: 16px;
  overflow: hidden;
  border: 1px solid var(--about-line);
}

.page-about .about-leagues__map-img img {
  display: block;
  width: 100%;
  height: auto;
}

.page-about .about-leagues__legend {
  display: flex;
  flex-wrap: wrap;
  gap: 18px;
  padding: 0 4px;
}

.page-about .about-leagues__legend-item {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 13px;
  color: var(--grey);
}

.page-about .about-leagues__swatch {
  width: 12px;
  height: 12px;
  border-radius: 3px;
  display: inline-block;
}

.page-about .about-leagues__swatch--euro {
  background: var(--about-cyan);
}

.page-about .about-leagues__swatch--asia {
  background: var(--about-neon);
}

.page-about .about-leagues__swatch--america {
  background: var(--about-violet);
}

.page-about .about-leagues .note {
  margin-top: 8px;
}

/* ========== 04 批次-44 ========== */
.page-about .about-batch {
  position: relative;
}

.page-about .about-batch::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 1px;
  background: linear-gradient(90deg, transparent, rgba(199, 255, 54, 0.35), transparent);
}

.page-about .about-batch__features {
  display: grid;
  gap: 16px;
  margin-top: 44px;
}

.page-about .about-batch__feature {
  position: relative;
  padding: 28px 24px 24px;
  background: var(--about-bg-panel);
  border: 1px solid var(--about-line);
  border-radius: 16px;
  overflow: hidden;
  transition: border-color 0.25s ease;
}

.page-about .about-batch__feature::after {
  content: '';
  position: absolute;
  left: 0;
  top: 0;
  height: 100%;
  width: 3px;
  background: linear-gradient(180deg, var(--about-neon), var(--about-cyan));
  opacity: 0.7;
}

.page-about .about-batch__feature:hover {
  border-color: rgba(0, 229, 255, 0.4);
}

.page-about .about-batch__feature-num {
  font-family: var(--font-data);
  font-size: 32px;
  font-weight: 800;
  color: var(--about-cyan);
  display: block;
  margin-bottom: 12px;
}

.page-about .about-batch__feature h3 {
  margin: 0 0 8px;
  font-size: 18px;
  font-weight: 700;
  color: var(--white);
}

.page-about .about-batch__feature p {
  margin: 0;
  font-size: 14px;
  line-height: 1.75;
  color: var(--grey);
}

/* ========== 05 团队与运营原则 ========== */
.page-about .about-team {
  position: relative;
  background: linear-gradient(100deg, transparent 0%, rgba(0, 229, 255, 0.04) 60%, transparent 100%);
}

.page-about .about-team__principles {
  display: grid;
  gap: 16px;
  margin-top: 32px;
}

.page-about .about-team__principle {
  background: var(--about-bg-panel);
  border: 1px solid var(--about-line);
  border-radius: 14px;
  padding: 22px 22px 20px;
}

.page-about .about-team__principle h3 {
  margin: 0 0 8px;
  font-size: 16px;
  font-weight: 700;
  color: var(--white);
  padding-left: 14px;
  position: relative;
}

.page-about .about-team__principle h3::before {
  content: '';
  position: absolute;
  left: 0;
  top: 0.18em;
  width: 5px;
  height: 1em;
  border-radius: 2px;
  background: var(--about-neon);
}

.page-about .about-team__principle p {
  margin: 0;
  font-size: 14px;
  line-height: 1.75;
  color: var(--grey);
}

/* ========== 下一页指引 ========== */
.page-about .about-next {
  padding: 64px 0 72px;
}

.page-about .about-next__grid {
  display: grid;
  gap: 14px;
}

.page-about .about-next__link {
  display: flex;
  flex-direction: column;
  gap: 8px;
  padding: 22px 20px;
  background: var(--about-bg-panel);
  border: 1px solid var(--about-line);
  border-radius: 14px;
  text-decoration: none;
  transition: border-color 0.25s ease, transform 0.25s ease, box-shadow 0.25s ease;
}

.page-about .about-next__link:hover,
.page-about .about-next__link:focus-visible {
  border-color: var(--about-neon);
  transform: translateY(-3px);
  box-shadow: var(--shadow);
  outline: none;
}

.page-about .about-next__link strong {
  font-size: 20px;
  font-weight: 800;
  color: var(--white);
  letter-spacing: 0.01em;
}

.page-about .about-next__link > span:last-child {
  font-size: 13px;
  line-height: 1.7;
  color: var(--grey);
}

/* ========== 平板 ========== */
@media (min-width: 768px) {
  .page-about .about-hero {
    padding: 56px 0 72px;
  }

  .page-about .about-hero__grid {
    grid-template-columns: 1fr 2.2fr;
    gap: 40px;
  }

  .page-about .about-hero__aside {
    flex-direction: column;
    align-items: flex-start;
    gap: 10px;
    padding-top: 6px;
  }

  .page-about .about-hero__index {
    margin-top: 64px;
  }

  .page-about .about-why,
  .page-about .about-birth,
  .page-about .about-leagues,
  .page-about .about-batch,
  .page-about .about-team {
    padding: 88px 0 96px;
  }

  .page-about .about-why__layout,
  .page-about .about-birth__layout,
  .page-about .about-leagues__head,
  .page-about .about-batch__layout,
  .page-about .about-team__layout {
    grid-template-columns: 1fr 3fr;
    gap: 48px;
  }

  .page-about .about-why__aside,
  .page-about .about-birth__aside,
  .page-about .about-leagues__aside,
  .page-about .about-batch__aside,
  .page-about .about-team__aside {
    flex-direction: column;
    gap: 8px;
    padding-top: 6px;
  }

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

  .page-about .about-timeline__rail {
    padding-left: 40px;
  }

  .page-about .about-timeline__rail::before {
    left: 11px;
  }

  .page-about .about-timeline__dot {
    left: -33px;
    width: 13px;
    height: 13px;
  }

  .page-about .about-timeline__card {
    padding: 26px 28px 24px;
  }

  .page-about .about-leagues__regions {
    grid-template-columns: repeat(3, 1fr);
    gap: 18px;
  }

  .page-about .about-leagues__map {
    grid-template-columns: 1.6fr 1fr;
    align-items: center;
    gap: 28px;
  }

  .page-about .about-leagues__legend {
    flex-direction: column;
    gap: 14px;
  }

  .page-about .about-batch__features {
    grid-template-columns: repeat(3, 1fr);
    gap: 18px;
  }

  .page-about .about-team__principles {
    grid-template-columns: repeat(3, 1fr);
    gap: 18px;
  }

  .page-about .about-next__grid {
    grid-template-columns: repeat(4, 1fr);
    gap: 16px;
  }
}

/* ========== 桌面 ========== */
@media (min-width: 1080px) {
  .page-about .about-hero h1 {
    font-size: 52px;
  }

  .page-about .about-hero .lede {
    font-size: 17px;
    line-height: 1.9;
  }

  .page-about .about-why__quote {
    font-size: 38px;
    max-width: 16em;
  }

  .page-about .about-leagues__stat {
    padding: 32px 36px;
  }

  .page-about .about-leagues__number {
    font-size: 96px;
  }

  .page-about .about-leagues__plus {
    font-size: 52px;
  }

  .page-about .about-timeline__item:nth-child(even) .about-timeline__card {
    margin-right: 0;
    margin-left: 6%;
  }

  .page-about .about-timeline__item:nth-child(odd) .about-timeline__card {
    margin-right: 6%;
    margin-left: 0;
  }
}