/* ===== 赛场概览 / page-about ===== */

.page-about {
  --ab-tight: clamp(20px, 2.6vw, 32px);
  --ab-loose: clamp(44px, 7vw, 96px);
  overflow-x: clip;
}

.page-about h2 {
  margin: 12px 0 0;
  font-size: clamp(24px, 3.4vw, 36px);
  font-weight: 800;
  line-height: 1.22;
  letter-spacing: -.015em;
  max-width: 24ch;
}

/* ---------- 首屏 ---------- */

.page-about .about-hero {
  position: relative;
  isolation: isolate;
  overflow: hidden;
  background-color: var(--c-deep);
  color: var(--c-white);
  padding: clamp(28px, 4.6vw, 56px) 0 clamp(36px, 5.6vw, 68px);
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  z-index: -2;
  background-image:
    linear-gradient(var(--line) 1px, transparent 1px),
    linear-gradient(90deg, var(--line) 1px, transparent 1px);
  background-size: 72px 72px;
  opacity: .55;
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  inset: 0;
  z-index: -1;
  pointer-events: none;
  background:
    radial-gradient(58% 62% at 84% 10%, rgba(34, 224, 206, .22), transparent 68%),
    radial-gradient(46% 52% at 4% 96%, rgba(255, 122, 43, .18), transparent 72%);
}

.page-about .about-hero__inner {
  display: grid;
  gap: clamp(26px, 3.6vw, 48px);
  align-items: center;
}

.page-about .about-hero .breadcrumbs a {
  color: var(--c-grid);
}

.page-about .about-hero .eyebrow {
  color: var(--c-cyan);
}

.page-about .about-hero h1 {
  margin: 16px 0 0;
  font-size: clamp(30px, 5.6vw, 60px);
  font-weight: 900;
  line-height: 1.08;
  letter-spacing: -.022em;
  max-width: 17ch;
}

.page-about .about-hero__lede {
  margin: 20px 0 0;
  max-width: 56ch;
  font-size: clamp(15px, 1.5vw, 17px);
  line-height: 1.85;
  color: rgba(242, 246, 251, .78);
}

.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 26px;
}

.page-about .hero-strip {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 20px;
  margin: clamp(30px, 4.2vw, 52px) 0 0;
  padding: 24px 0 0;
  border-top: 1px solid var(--line);
  list-style: none;
}

.page-about .hero-strip__value {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(24px, 3.2vw, 34px);
  font-weight: 700;
  line-height: 1;
  letter-spacing: -.02em;
  font-variant-numeric: tabular-nums;
  color: var(--c-cyan);
}

.page-about .hero-strip__item:last-child .hero-strip__value {
  color: var(--c-orange);
}

.page-about .hero-strip__label {
  display: block;
  margin-top: 9px;
  font-size: 12px;
  letter-spacing: .12em;
  color: var(--c-grid);
}

.page-about .about-hero__visual .media-frame {
  border: 1px solid var(--line-strong);
}

.page-about .media-frame {
  position: relative;
  display: block;
  margin: 0;
  overflow: hidden;
  background: var(--c-stand);
}

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

/* ---------- 章节索引 ---------- */

.page-about .about-index {
  background: var(--c-stand);
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}

.page-about .about-index__inner {
  display: flex;
  align-items: center;
  gap: 16px;
  padding-top: 11px;
  padding-bottom: 11px;
  overflow-x: auto;
  scrollbar-width: none;
}

.page-about .about-index__inner::-webkit-scrollbar {
  display: none;
}

.page-about .about-index__label {
  flex: 0 0 auto;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .2em;
  color: var(--c-cyan);
}

.page-about .about-index__list {
  display: flex;
  flex: 0 0 auto;
  gap: 4px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .about-index__list a {
  display: block;
  padding: 6px 12px;
  font-size: 13px;
  white-space: nowrap;
  text-decoration: none;
  color: rgba(242, 246, 251, .72);
  border: 1px solid transparent;
  transition: color .16s ease, border-color .16s ease;
}

.page-about .about-index__list a:hover,
.page-about .about-index__list a:focus-visible {
  color: var(--c-white);
  border-color: var(--line-strong);
}

/* ---------- 纵向旁注布局 ---------- */

.page-about .with-note {
  display: grid;
  gap: 18px;
}

.page-about .side-note {
  margin: 0;
  align-self: start;
  writing-mode: vertical-rl;
  text-orientation: mixed;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .3em;
  color: var(--c-grid);
}

/* ---------- 我们做什么 ---------- */

.page-about .about-do__grid {
  display: grid;
  gap: 28px;
  margin-top: var(--ab-tight);
}

.page-about .about-do__text p {
  margin: 0 0 16px;
  max-width: 60ch;
  font-size: 16px;
  line-height: 1.85;
  color: rgba(242, 246, 251, .8);
}

.page-about .about-do__text p:last-child {
  margin-bottom: 0;
}

.page-about .about-do__list {
  margin: 0;
  padding: 0;
  list-style: none;
  border-top: 1px solid var(--line-strong);
}

.page-about .about-do__list li {
  position: relative;
  padding: 14px 0 14px 24px;
  border-bottom: 1px solid var(--line);
  font-size: 14.5px;
  line-height: 1.7;
  color: rgba(242, 246, 251, .86);
}

.page-about .about-do__list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 24px;
  width: 10px;
  height: 1px;
  background: var(--c-cyan);
}

/* ---------- 内容与数据体系 ---------- */

.page-about .about-data__lede {
  margin: 18px 0 0;
  max-width: 62ch;
  font-size: 16px;
  line-height: 1.85;
  color: var(--c-ink);
}

.page-about .about-data__grid {
  display: grid;
  gap: 30px;
  margin-top: var(--ab-tight);
}

.page-about .metric-pair {
  display: grid;
  gap: 14px;
  margin-bottom: 30px;
}

.page-about .metric {
  padding: 16px 18px;
  background: #ffffff;
  border: 1px solid rgba(61, 76, 94, .16);
  border-left: 3px solid var(--c-cyan);
}

.page-about .metric--warm {
  border-left-color: var(--c-orange);
}

.page-about .metric__label {
  display: block;
  font-size: 15px;
  font-weight: 700;
  letter-spacing: -.01em;
  color: var(--c-deep);
}

.page-about .metric__desc {
  display: block;
  margin-top: 8px;
  font-size: 13.5px;
  line-height: 1.72;
  color: var(--c-ink);
}

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

.page-about .flow__item {
  display: grid;
  grid-template-columns: 38px minmax(0, 1fr);
  gap: 16px;
  padding: 18px 0;
  border-top: 1px solid rgba(61, 76, 94, .16);
}

.page-about .flow__item:last-child {
  border-bottom: 1px solid rgba(61, 76, 94, .16);
}

.page-about .flow__idx {
  padding-top: 4px;
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 700;
  color: var(--c-orange);
}

.page-about .flow__title {
  display: block;
  font-size: 15.5px;
  font-weight: 700;
  color: var(--c-deep);
}

.page-about .flow__desc {
  margin: 7px 0 0;
  font-size: 14px;
  line-height: 1.78;
  color: var(--c-ink);
}

.page-about .about-data__note {
  margin: 20px 0 0;
  padding: 14px 16px;
  font-size: 13.5px;
  line-height: 1.72;
  color: var(--c-ink);
  border: 1px dashed rgba(61, 76, 94, .3);
  background: rgba(34, 224, 206, .06);
}

/* ---------- 五个联赛 ---------- */

.page-about .about-leagues__lede {
  margin: 18px 0 0;
  max-width: 58ch;
  font-size: 15.5px;
  line-height: 1.82;
  color: rgba(242, 246, 251, .76);
}

.page-about .league-rail-wrap {
  margin-top: var(--ab-tight);
}

.page-about .league-rail {
  display: flex;
  gap: 14px;
  margin: 0;
  padding: 4px 0 18px;
  list-style: none;
  overflow-x: auto;
  scroll-snap-type: x proximity;
  scrollbar-width: thin;
  scrollbar-color: rgba(34, 224, 206, .5) transparent;
}

.page-about .league-rail::-webkit-scrollbar {
  height: 4px;
}

.page-about .league-rail::-webkit-scrollbar-thumb {
  background: rgba(34, 224, 206, .5);
}

.page-about .league-card {
  flex: 0 0 min(78vw, 300px);
  scroll-snap-align: start;
  display: flex;
  flex-direction: column;
  gap: 10px;
  min-height: 236px;
  padding: 20px 18px 22px;
  border: 1px solid var(--line);
  border-top: 2px solid var(--c-cyan);
  background: linear-gradient(158deg, rgba(22, 48, 79, .95), rgba(10, 26, 49, .95));
  transition: border-color .18s ease;
}

.page-about .league-card:hover {
  border-top-color: var(--c-orange);
}

.page-about .league-card__idx {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .22em;
  color: var(--c-cyan);
}

.page-about .league-card__name {
  margin: 0;
  font-size: 19px;
  font-weight: 800;
  letter-spacing: -.01em;
  color: var(--c-white);
}

.page-about .league-card__desc {
  margin: 0;
  font-size: 14px;
  line-height: 1.75;
  color: rgba(242, 246, 251, .74);
}

.page-about .league-card__tags {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin-top: auto;
  padding-top: 12px;
}

.page-about .about-leagues__media {
  margin-top: var(--ab-tight);
  border: 1px solid var(--line);
}

/* ---------- 赛季节奏时间轴 ---------- */

.page-about .timeline {
  position: relative;
  margin: var(--ab-tight) 0 0;
  padding: 0 0 0 34px;
  list-style: none;
}

.page-about .timeline::before {
  content: "";
  position: absolute;
  left: 10px;
  top: 10px;
  bottom: 10px;
  width: 1px;
  background: linear-gradient(180deg, var(--c-cyan) 0%, var(--c-orange) 62%, rgba(255, 122, 43, 0) 100%);
}

.page-about .tl-item {
  position: relative;
  padding-bottom: 28px;
}

.page-about .tl-item:last-child {
  padding-bottom: 0;
}

.page-about .tl-item::before {
  content: "";
  position: absolute;
  left: -30px;
  top: 6px;
  width: 13px;
  height: 13px;
  box-sizing: border-box;
  background: var(--c-mist);
  border: 2px solid var(--c-cyan);
}

.page-about .tl-item:nth-child(3)::before {
  border-color: var(--c-orange);
}

.page-about .tl-phase {
  display: inline-block;
  margin-bottom: 6px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .2em;
  color: var(--c-orange);
}

.page-about .tl-title {
  margin: 0;
  font-size: 18px;
  font-weight: 800;
  letter-spacing: -.01em;
  color: var(--c-deep);
}

.page-about .tl-desc {
  margin: 8px 0 0;
  max-width: 62ch;
  font-size: 14.5px;
  line-height: 1.82;
  color: var(--c-ink);
}

/* ---------- 合作与团队 ---------- */

.page-about .about-team__coop {
  margin: var(--ab-tight) 0 0;
  padding: 0;
  list-style: none;
  border-top: 1px solid var(--line-strong);
}

.page-about .coop-row {
  display: grid;
  gap: 8px;
  padding: 18px 0;
  border-bottom: 1px solid var(--line);
}

.page-about .coop-row__num {
  font-family: var(--font-mono);
  font-size: clamp(22px, 2.8vw, 30px);
  font-weight: 700;
  line-height: 1;
  font-variant-numeric: tabular-nums;
  color: var(--c-cyan);
}

.page-about .coop-row__title {
  font-size: 15.5px;
  font-weight: 700;
  color: var(--c-white);
}

.page-about .coop-row__desc {
  font-size: 14px;
  line-height: 1.72;
  color: rgba(242, 246, 251, .74);
}

.page-about .about-team__crew {
  display: grid;
  gap: 22px;
  margin-top: clamp(32px, 4vw, 48px);
  padding-top: clamp(24px, 3vw, 36px);
  border-top: 1px solid var(--line);
}

.page-about .crew-total__value {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(48px, 7vw, 74px);
  font-weight: 700;
  line-height: .95;
  letter-spacing: -.03em;
  font-variant-numeric: tabular-nums;
  color: var(--c-orange);
}

.page-about .crew-total__label {
  display: block;
  margin-top: 10px;
  font-size: 13px;
  letter-spacing: .12em;
  color: var(--c-grid);
}

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

.page-about .crew-list li {
  padding: 14px 16px;
  border: 1px solid var(--line);
  background: rgba(10, 26, 49, .5);
}

.page-about .crew-list__num {
  font-family: var(--font-mono);
  font-size: 22px;
  font-weight: 700;
  font-variant-numeric: tabular-nums;
  color: var(--c-cyan);
}

.page-about .crew-list__role {
  display: block;
  margin-top: 7px;
  font-size: 13.5px;
  line-height: 1.6;
  color: rgba(242, 246, 251, .8);
}

/* ---------- 继续了解 ---------- */

.page-about .about-next__grid {
  display: grid;
  gap: 16px;
  margin-top: var(--ab-tight);
}

.page-about .next-card {
  position: relative;
  display: flex;
  flex-direction: column;
  gap: 10px;
  padding: 26px 24px 28px;
  border: 1px solid var(--line);
  background: linear-gradient(150deg, rgba(22, 48, 79, .95), rgba(10, 26, 49, .92));
  color: var(--c-white);
  text-decoration: none;
  transition: border-color .18s ease, transform .18s ease;
}

.page-about .next-card--primary {
  border-left: 3px solid var(--c-orange);
}

.page-about .next-card:hover,
.page-about .next-card:focus-visible {
  border-color: var(--c-cyan);
  transform: translateY(-2px);
}

.page-about .next-card__tag {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .22em;
  color: var(--c-cyan);
}

.page-about .next-card__title {
  font-size: 21px;
  font-weight: 800;
  letter-spacing: -.012em;
}

.page-about .next-card__desc {
  font-size: 14.5px;
  line-height: 1.76;
  color: rgba(242, 246, 251, .75);
}

.page-about .next-card__go {
  margin-top: auto;
  padding-top: 12px;
  font-size: 13.5px;
  font-weight: 700;
  color: var(--c-orange);
}

.page-about .about-next__more {
  margin: 24px 0 0;
  font-size: 14px;
  line-height: 1.8;
  color: rgba(242, 246, 251, .7);
}

.page-about .about-next__more a {
  color: var(--c-cyan);
  text-underline-offset: 3px;
}

/* ---------- 响应式 ---------- */

@media (min-width: 620px) {
  .page-about .metric-pair {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

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

@media (min-width: 760px) {
  .page-about .hero-strip {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .page-about .coop-row {
    grid-template-columns: 120px minmax(0, 1fr) minmax(0, 1.05fr);
    gap: 26px;
    align-items: baseline;
  }

  .page-about .about-team__crew {
    grid-template-columns: 220px minmax(0, 1fr);
    align-items: center;
    gap: 40px;
  }
}

@media (min-width: 880px) {
  .page-about .about-do__grid {
    grid-template-columns: minmax(0, 1.3fr) minmax(0, .85fr);
    gap: clamp(32px, 4vw, 60px);
    align-items: start;
  }

  .page-about .about-data__grid {
    grid-template-columns: minmax(0, .92fr) minmax(0, 1.08fr);
    gap: clamp(32px, 4.2vw, 68px);
    align-items: start;
  }

  .page-about .with-note {
    grid-template-columns: 44px minmax(0, 1fr);
    gap: clamp(24px, 3.4vw, 52px);
  }
}

@media (min-width: 900px) {
  .page-about .about-hero__inner {
    grid-template-columns: minmax(0, 1.02fr) minmax(0, .98fr);
    gap: clamp(40px, 4.6vw, 72px);
  }

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

@media (min-width: 1100px) {
  .page-about .league-card {
    flex-basis: 318px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .league-card,
  .page-about .next-card,
  .page-about .about-index__list a {
    transition: none;
  }

  .page-about .next-card:hover,
  .page-about .next-card:focus-visible {
    transform: none;
  }
}