.page-about {
  --about-measure: 64ch;
  --about-node: 11px;
  padding-bottom: clamp(48px, 9vw, 112px);
}

.page-about .breadcrumb {
  padding-top: clamp(18px, 3vw, 32px);
}

/* ---------- 首屏 ---------- */

.page-about .about-hero {
  position: relative;
  padding: clamp(26px, 5vw, 58px) 0 clamp(36px, 7vw, 84px);
  isolation: isolate;
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  inset: -25% -12% auto -12%;
  height: 78%;
  background:
    radial-gradient(ellipse at 74% 32%, rgba(111, 91, 255, .30), transparent 60%),
    radial-gradient(ellipse at 12% 8%, rgba(47, 230, 230, .14), transparent 58%);
  pointer-events: none;
  z-index: -1;
}

.page-about .about-hero__grid {
  display: grid;
  gap: clamp(30px, 5vw, 58px);
}

.page-about .about-hero__copy {
  max-width: 34ch;
}

.page-about .about-hero__title {
  margin: 14px 0 0;
  font-family: var(--font-serif);
  font-size: var(--step-4);
  font-weight: 600;
  line-height: 1.06;
  letter-spacing: -.01em;
  color: var(--text);
}

.page-about .about-hero__lead {
  margin: clamp(18px, 3vw, 26px) 0 0;
  max-width: 46ch;
  font-size: var(--step-1);
  line-height: 1.6;
  color: var(--text-soft);
}

.page-about .about-hero__facts {
  display: flex;
  flex-wrap: wrap;
  gap: 14px 32px;
  margin: clamp(26px, 4vw, 38px) 0 0;
  padding: 20px 0 0;
  list-style: none;
  border-top: 1px solid var(--line-soft);
  font-family: var(--font-ui);
  font-size: var(--step--1);
  line-height: 1.5;
  letter-spacing: .02em;
  color: var(--text-dim);
}

.page-about .about-fact__num {
  display: block;
  font-family: var(--font-mono);
  font-size: var(--step-2);
  font-weight: 600;
  line-height: 1.1;
  color: var(--lime);
}

.page-about .about-hero__figure {
  margin: 0;
  overflow: hidden;
  border: 1px solid var(--line-soft);
  border-radius: var(--radius);
  background: var(--ink-2);
  clip-path: polygon(0 5%, 100% 0, 100% 95%, 0 100%);
}

.page-about .about-hero__figure img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
  filter: saturate(.85) contrast(1.06) brightness(.92);
}

/* ---------- 正文框架 ---------- */

.page-about .about-body {
  display: grid;
  gap: clamp(30px, 5vw, 64px);
  padding-top: clamp(10px, 2.5vw, 28px);
}

.page-about .about-toc {
  display: none;
  font-family: var(--font-ui);
}

.page-about .about-toc__label {
  margin: 0 0 14px;
  font-size: var(--step--2);
  letter-spacing: .2em;
  text-transform: uppercase;
  color: var(--text-dim);
}

.page-about .about-toc .toc__list {
  display: grid;
  gap: 2px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .about-toc .toc__link {
  display: block;
  padding: 7px 10px 7px 12px;
  border-left: 1px solid var(--line);
  font-size: var(--step--1);
  line-height: 1.45;
  color: var(--text-dim);
  text-decoration: none;
  transition: color .2s var(--ease), border-color .2s var(--ease), padding-left .2s var(--ease);
}

.page-about .about-toc .toc__link:hover,
.page-about .about-toc .toc__link:focus-visible {
  padding-left: 16px;
  border-left-color: var(--violet);
  color: var(--text);
}

.page-about .about-flow {
  min-width: 0;
}

/* ---------- 章节 ---------- */

.page-about .about-section {
  padding-top: clamp(34px, 6vw, 60px);
  margin-top: clamp(34px, 6vw, 60px);
  border-top: 1px solid var(--line-soft);
  scroll-margin-top: calc(var(--header-offset) + 28px);
}

.page-about .about-section:first-child {
  margin-top: 0;
  padding-top: 0;
  border-top: 0;
}

.page-about .about-section__index {
  margin: 0 0 10px;
  font-family: var(--font-mono);
  font-size: var(--step--1);
  letter-spacing: .18em;
  color: var(--violet);
}

.page-about .about-section .section__title {
  max-width: 26ch;
  font-size: var(--step-3);
  line-height: 1.16;
}

.page-about .about-section .section__lead {
  max-width: var(--about-measure);
  margin-top: clamp(16px, 2.5vw, 24px);
  font-size: var(--step-1);
  line-height: 1.62;
  color: var(--text-soft);
}

.page-about .prose {
  max-width: var(--about-measure);
  margin-top: clamp(18px, 2.6vw, 26px);
}

.page-about .prose p {
  font-size: var(--step-0);
  line-height: 1.8;
  color: var(--text-soft);
}

.page-about .prose p + p {
  margin-top: 1.1em;
}

.page-about .about-quote {
  position: relative;
  max-width: 52ch;
  margin: clamp(26px, 4vw, 40px) 0 0;
  padding: 6px 0 6px 22px;
  border-left: 2px solid var(--moss);
}

.page-about .about-quote p {
  margin: 0;
  font-family: var(--font-serif);
  font-size: var(--step-1);
  line-height: 1.6;
  color: var(--bone);
}

/* ---------- 时间线 ---------- */

.page-about .timeline {
  position: relative;
  margin: clamp(28px, 5vw, 44px) 0 0;
  padding: 0 0 0 28px;
  list-style: none;
}

.page-about .timeline::before {
  content: "";
  position: absolute;
  left: 5px;
  top: 10px;
  bottom: 26px;
  width: 1px;
  background: linear-gradient(180deg, var(--moss), var(--clay) 55%, rgba(42, 49, 56, 0) 100%);
}

.page-about .timeline__item {
  position: relative;
  padding-bottom: clamp(26px, 4.5vw, 42px);
}

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

.page-about .timeline__item::before {
  content: "";
  position: absolute;
  left: -26px;
  top: 8px;
  width: var(--about-node);
  height: var(--about-node);
  border-radius: 50%;
  background: var(--ink);
  border: 1px solid var(--moss);
  transition: background-color .22s var(--ease), border-color .22s var(--ease), transform .22s var(--ease);
}

.page-about .timeline__item:nth-child(2)::before {
  border-color: var(--clay);
}

.page-about .timeline__item:hover::before {
  background: var(--cyan);
  border-color: var(--cyan);
  transform: scale(1.3);
}

.page-about .timeline__head {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 8px 14px;
}

.page-about .timeline__phase {
  font-family: var(--font-ui);
  font-size: var(--step--2);
  letter-spacing: .16em;
  text-transform: uppercase;
  color: var(--text-dim);
}

.page-about .timeline__title {
  margin: 0;
  font-family: var(--font-serif);
  font-size: var(--step-2);
  font-weight: 600;
  line-height: 1.3;
  color: var(--text);
}

.page-about .timeline__summary {
  max-width: 58ch;
  margin: 10px 0 0;
  font-size: var(--step-0);
  line-height: 1.75;
  color: var(--text-soft);
}

/* ---------- 团队 ---------- */

.page-about .about-team {
  display: grid;
  gap: clamp(24px, 4vw, 44px);
  margin-top: clamp(24px, 4vw, 40px);
}

.page-about .about-team__figure {
  margin: 0;
  overflow: hidden;
  border: 1px solid var(--line-soft);
  border-radius: var(--radius);
  background: var(--ink-2);
}

.page-about .about-team__figure img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
  filter: saturate(.8) brightness(.9);
}

.page-about .about-team__body p {
  max-width: var(--about-measure);
  font-size: var(--step-0);
  line-height: 1.8;
  color: var(--text-soft);
}

.page-about .about-team__body p + p {
  margin-top: 1em;
}

.page-about .roster {
  display: grid;
  gap: 10px;
  margin: clamp(20px, 3.5vw, 30px) 0 0;
  padding: 0;
  list-style: none;
}

.page-about .roster__role {
  display: flex;
  align-items: baseline;
  gap: 10px;
  padding: 11px 14px;
  border: 1px solid var(--line-soft);
  border-radius: var(--radius);
  background: var(--glass);
  font-family: var(--font-ui);
  font-size: var(--step--1);
  line-height: 1.5;
  color: var(--text-soft);
  transition: border-color .2s var(--ease), transform .2s var(--ease);
}

.page-about .roster__role:hover {
  border-color: rgba(111, 91, 255, .55);
  transform: translateX(3px);
}

.page-about .roster__mark {
  flex: 0 0 auto;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--cyan);
}

/* ---------- 覆盖联赛 ---------- */

.page-about .coverage {
  display: grid;
  gap: clamp(18px, 3vw, 28px);
  margin-top: clamp(24px, 4vw, 38px);
  padding: clamp(20px, 3vw, 30px);
  border: 1px solid var(--line-soft);
  border-radius: var(--radius);
  background: var(--glass);
}

.page-about .coverage__count {
  display: flex;
  align-items: baseline;
  gap: 12px;
}

.page-about .coverage__num {
  font-family: var(--font-mono);
  font-size: var(--step-4);
  font-weight: 600;
  line-height: 1;
  color: var(--lime);
}

.page-about .coverage__unit {
  font-family: var(--font-ui);
  font-size: var(--step--1);
  letter-spacing: .1em;
  color: var(--text-dim);
}

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

.page-about .league-chips li {
  padding: 5px 13px;
  border: 1px solid var(--line-soft);
  border-radius: 999px;
  font-family: var(--font-ui);
  font-size: var(--step--1);
  line-height: 1.5;
  color: var(--text-soft);
  transition: border-color .2s var(--ease), color .2s var(--ease), background-color .2s var(--ease);
}

.page-about .league-chips li:hover {
  border-color: rgba(47, 230, 230, .6);
  background: rgba(47, 230, 230, .08);
  color: var(--text);
}

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

.page-about .pillar {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 14px;
  padding: clamp(18px, 3vw, 26px) 0;
  border-top: 1px solid var(--line-soft);
}

.page-about .pillar:last-child {
  border-bottom: 1px solid var(--line-soft);
}

.page-about .pillar__index {
  margin: 2px 0 0;
  font-family: var(--font-mono);
  font-size: var(--step--1);
  letter-spacing: .1em;
  color: var(--text-dim);
}

.page-about .pillar__title {
  margin: 0;
  font-family: var(--font-serif);
  font-size: var(--step-1);
  font-weight: 600;
  line-height: 1.4;
  color: var(--text);
}

.page-about .pillar__body {
  max-width: 60ch;
  margin: 8px 0 0;
  font-size: var(--step-0);
  line-height: 1.75;
  color: var(--text-soft);
}

.page-about .pillar .btn {
  margin-top: 12px;
}

/* ---------- 合作生态 ---------- */

.page-about .eco-figure {
  margin: clamp(26px, 4vw, 40px) 0 0;
  padding: clamp(16px, 3vw, 26px) clamp(12px, 3vw, 24px) 0;
  border: 1px solid var(--line-soft);
  border-radius: var(--radius);
  background: linear-gradient(160deg, rgba(111, 91, 255, .10), rgba(47, 230, 230, .05) 60%, transparent);
}

.page-about .eco-map {
  display: block;
  width: 100%;
  height: auto;
}

.page-about .eco-map__link {
  fill: none;
  stroke: rgba(243, 240, 233, .18);
  stroke-width: 1;
  stroke-dasharray: 3 5;
}

.page-about .eco-map__dot {
  fill: var(--rock);
  transition: fill .22s var(--ease), transform .22s var(--ease);
  transform-box: fill-box;
  transform-origin: center;
}

.page-about .eco-map__dot:hover {
  fill: var(--cyan);
  transform: scale(1.4);
}

.page-about .eco-map__hub {
  fill: var(--ink-3);
  stroke-width: 1.5;
  transition: fill .22s var(--ease), stroke .22s var(--ease), transform .22s var(--ease);
  transform-box: fill-box;
  transform-origin: center;
}

.page-about .eco-map__hub--moss {
  stroke: var(--moss);
}

.page-about .eco-map__hub--clay {
  stroke: var(--clay);
}

.page-about .eco-map__hub--cyan {
  stroke: var(--cyan);
}

.page-about .eco-map__hub:hover {
  fill: var(--violet);
  stroke: var(--violet);
  transform: scale(1.15);
}

.page-about .eco-figure__caption {
  margin: 14px 0 0;
  padding-top: 12px;
  border-top: 1px dashed var(--line-soft);
  font-family: var(--font-ui);
  font-size: var(--step--2);
  letter-spacing: .08em;
  color: var(--text-dim);
}

.page-about .eco-list {
  display: grid;
  gap: 16px;
  margin: clamp(24px, 4vw, 36px) 0 0;
  padding: 0;
  list-style: none;
}

.page-about .eco-item {
  padding: clamp(18px, 3vw, 24px);
  border: 1px solid var(--line-soft);
  border-top-width: 2px;
  border-radius: var(--radius);
  background: var(--ink-2);
  transition: border-color .22s var(--ease), background-color .22s var(--ease);
}

.page-about .eco-item--venue {
  border-top-color: var(--moss);
}

.page-about .eco-item--club {
  border-top-color: var(--clay);
}

.page-about .eco-item--data {
  border-top-color: var(--cyan);
}

.page-about .eco-item:hover {
  background: #121C2C;
}

.page-about .eco-item--venue:hover {
  border-color: var(--moss);
}

.page-about .eco-item--club:hover {
  border-color: var(--clay);
}

.page-about .eco-item--data:hover {
  border-color: var(--cyan);
}

.page-about .eco-item__num {
  margin: 0;
  font-family: var(--font-mono);
  font-size: var(--step-3);
  font-weight: 600;
  line-height: 1;
  color: var(--bone);
}

.page-about .eco-item__title {
  margin: 12px 0 0;
  font-family: var(--font-ui);
  font-size: var(--step-1);
  font-weight: 600;
  letter-spacing: .01em;
  color: var(--text);
}

.page-about .eco-item__body {
  margin: 8px 0 0;
  font-size: var(--step--1);
  line-height: 1.75;
  color: var(--text-soft);
}

/* ---------- 结尾行动区 ---------- */

.page-about .about-cta {
  display: grid;
  gap: 20px;
  margin-top: clamp(28px, 5vw, 44px);
  padding: clamp(22px, 4vw, 34px);
  border: 1px solid rgba(184, 107, 75, .45);
  border-radius: var(--radius);
  background: linear-gradient(140deg, rgba(184, 107, 75, .16), rgba(14, 22, 36, .7) 62%);
}

.page-about .about-cta__title {
  margin: 0;
  font-family: var(--font-serif);
  font-size: var(--step-2);
  font-weight: 600;
  line-height: 1.35;
  color: var(--text);
}

.page-about .about-cta__copy p {
  max-width: 56ch;
  margin: 12px 0 0;
  font-size: var(--step-0);
  line-height: 1.75;
  color: var(--text-soft);
}

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

/* ---------- 桌面 ---------- */

@media (min-width: 760px) {
  .page-about .about-team {
    grid-template-columns: minmax(0, .92fr) minmax(0, 1.08fr);
    align-items: start;
  }

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

  .page-about .about-cta {
    grid-template-columns: minmax(0, 1fr) auto;
    align-items: end;
  }
}

@media (min-width: 900px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 1.02fr) minmax(0, .98fr);
    align-items: center;
  }

  .page-about .about-hero__copy {
    max-width: none;
  }

  .page-about .about-hero__figure {
    aspect-ratio: 16 / 11;
  }
}

@media (min-width: 1000px) {
  .page-about .about-body {
    grid-template-columns: 194px minmax(0, 1fr);
    gap: clamp(44px, 6vw, 84px);
  }

  .page-about .about-toc {
    display: block;
    position: sticky;
    top: calc(var(--header-offset) + 26px);
    align-self: start;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .timeline__item::before,
  .page-about .roster__role,
  .page-about .league-chips li,
  .page-about .eco-map__dot,
  .page-about .eco-map__hub,
  .page-about .eco-item,
  .page-about .about-toc .toc__link {
    transition: none;
  }

  .page-about .timeline__item:hover::before,
  .page-about .roster__role:hover,
  .page-about .eco-map__dot:hover,
  .page-about .eco-map__hub:hover {
    transform: none;
  }
}