.page-about {
  --about-gutter: 20px;
  --about-tint: rgba(34, 230, 210, 0.10);
  background: var(--ink-900);
  color: var(--frost);
  overflow-x: hidden;
}

.page-about .breadcrumbs {
  max-width: var(--shell);
  margin: 0 auto;
  padding: calc(var(--header-h) + 22px) 20px 0;
}

/* ---------- 首屏 ---------- */

.page-about .about-hero {
  position: relative;
  padding-bottom: 16px;
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  inset: 0 0 auto 0;
  height: 82%;
  background:
    radial-gradient(58% 78% at 10% 6%, rgba(34, 230, 210, 0.14), transparent 70%),
    radial-gradient(52% 70% at 92% 34%, rgba(255, 106, 43, 0.11), transparent 72%);
  pointer-events: none;
}

.page-about .about-hero-inner {
  position: relative;
  z-index: 1;
  max-width: var(--shell-wide);
  margin: 0 auto;
  padding: 34px var(--about-gutter) 48px;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 34px;
  align-items: center;
}

.page-about .about-hero-copy {
  position: relative;
  padding-left: 18px;
}

.page-about .about-hero-copy::before {
  content: "";
  position: absolute;
  left: 0;
  top: 8px;
  bottom: 8px;
  width: 3px;
  border-radius: 3px;
  background: linear-gradient(180deg, var(--neon), rgba(255, 106, 43, 0.55) 62%, transparent);
}

.page-about .about-hero-copy h1 {
  font-size: clamp(2.25rem, 6.6vw, 4.6rem);
  line-height: 1.04;
  letter-spacing: -0.02em;
  font-weight: 900;
  margin: 14px 0 20px;
  color: var(--frost);
}

.page-about .about-hero-copy .lede {
  max-width: 34em;
  margin: 0;
  color: var(--mist);
  font-size: 1.0625rem;
  line-height: 1.75;
}

.page-about .about-hero-stats {
  list-style: none;
  margin: 30px 0 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 16px 30px;
}

.page-about .about-hero-stats li {
  display: flex;
  flex-direction: column;
  gap: 4px;
  padding-left: 14px;
  border-left: 2px solid var(--line-neon);
}

.page-about .about-hero-num {
  font-family: var(--font-num);
  font-variant-numeric: tabular-nums;
  font-size: 1.5rem;
  font-weight: 700;
  letter-spacing: -0.01em;
  color: var(--neon);
}

.page-about .about-hero-stats li:nth-child(2) .about-hero-num {
  color: var(--flame);
}

.page-about .about-hero-stats li:nth-child(3) .about-hero-num {
  color: var(--gold);
}

.page-about .about-hero-cap {
  font-size: 0.8125rem;
  letter-spacing: 0.04em;
  color: var(--mist);
}

.page-about .about-hero-media {
  margin: 0;
  position: relative;
}

.page-about .about-hero-media .media {
  border-radius: var(--radius-lg);
  position: relative;
}

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

.page-about .about-hero-media::after {
  content: "";
  position: absolute;
  inset: 0;
  border-radius: var(--radius-lg);
  border: 1px solid var(--line-neon);
  box-shadow: 0 24px 60px rgba(0, 0, 0, 0.55);
  pointer-events: none;
}

.page-about .about-media-169 {
  aspect-ratio: 16 / 9;
}

.page-about .about-media-43 {
  aspect-ratio: 4 / 3;
}

.page-about .about-media-75 {
  aspect-ratio: 7 / 5;
}

.page-about .about-data-figure .media,
.page-about .about-cities-figure .media {
  border-radius: var(--radius-lg);
  overflow: hidden;
}

.page-about .about-data-figure .media img,
.page-about .about-cities-figure .media img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
}

/* ---------- 章节通用 ---------- */

.page-about .section {
  padding-block: 64px;
}

.page-about .about-head {
  max-width: 42rem;
  margin-bottom: 40px;
}

.page-about .about-head .lede {
  color: var(--mist);
  margin: 12px 0 0;
  line-height: 1.75;
}

.page-about .about-offset {
  max-width: 44rem;
}

.page-about .about-offset p {
  margin: 0 0 18px;
  line-height: 1.8;
  color: var(--frost);
}

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

/* ---------- 时间轴 ---------- */

.page-about .about-timeline {
  list-style: none;
  margin: 0;
  padding: 0 0 0 30px;
  position: relative;
}

.page-about .about-timeline::before {
  content: "";
  position: absolute;
  left: 7px;
  top: 10px;
  bottom: 10px;
  width: 2px;
  border-radius: 2px;
  background: linear-gradient(180deg, var(--neon), rgba(255, 201, 60, 0.85) 62%, transparent);
}

.page-about .about-timeline li {
  position: relative;
  padding-bottom: 34px;
}

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

.page-about .about-timeline li::before {
  content: "";
  position: absolute;
  left: -30px;
  top: 6px;
  width: 16px;
  height: 16px;
  border-radius: 50%;
  background: var(--ink-900);
  border: 2px solid var(--neon);
  box-shadow: 0 0 0 4px rgba(34, 230, 210, 0.12);
}

.page-about .about-timeline li.is-milestone::before {
  background: var(--gold);
  border-color: var(--gold);
  box-shadow: 0 0 0 4px rgba(255, 201, 60, 0.16);
}

.page-about .about-year {
  display: block;
  font-family: var(--font-num);
  font-variant-numeric: tabular-nums;
  font-size: 1.375rem;
  font-weight: 700;
  letter-spacing: 0.01em;
  color: var(--neon);
  margin-bottom: 6px;
}

.page-about .about-timeline li.is-milestone .about-year {
  color: var(--gold);
}

.page-about .about-node-body h3 {
  margin: 0 0 8px;
  font-size: 1.125rem;
  font-weight: 800;
  color: var(--frost);
}

.page-about .about-node-body p {
  margin: 0;
  color: var(--mist);
  line-height: 1.75;
}

/* ---------- 数据底座 ---------- */

.page-about .about-data-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 34px;
  align-items: start;
}

.page-about .about-data-copy p {
  margin: 0 0 18px;
  line-height: 1.8;
}

.page-about .about-data-figure {
  margin: 0;
}

.page-about .about-data-figure .media-caption {
  margin-top: 12px;
  color: var(--mist);
  font-size: 0.8125rem;
  letter-spacing: 0.04em;
}

.page-about .about-stats {
  list-style: none;
  margin: 44px 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--line-soft);
  border: 1px solid var(--line-soft);
  border-radius: var(--radius-lg);
  overflow: hidden;
}

.page-about .about-stat {
  background: var(--ink-800);
  padding: 26px 20px;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.page-about .about-stat-num {
  font-family: var(--font-num);
  font-variant-numeric: tabular-nums;
  font-size: clamp(2rem, 5.2vw, 2.75rem);
  font-weight: 700;
  line-height: 1;
  color: var(--frost);
}

.page-about .about-stat-num--neon {
  color: var(--neon);
}

.page-about .about-stat-num--flame {
  color: var(--flame);
}

.page-about .about-stat-num--gold {
  color: var(--gold);
}

.page-about .about-stat-label {
  font-size: 0.8125rem;
  letter-spacing: 0.04em;
  color: var(--mist);
}

/* ---------- 内容与编辑 ---------- */

.page-about .about-editorial-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 34px;
  align-items: start;
}

.page-about .about-editorial-copy p {
  margin: 0 0 18px;
  line-height: 1.8;
}

.page-about .about-editorial-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
}

.page-about .about-editorial-list li {
  background: var(--ink-700);
  border: 1px solid var(--line-soft);
  border-radius: var(--radius-md);
  padding: 20px 18px;
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.page-about .about-editorial-num {
  font-family: var(--font-num);
  font-variant-numeric: tabular-nums;
  font-size: 1.75rem;
  font-weight: 700;
  color: var(--neon);
  line-height: 1;
}

.page-about .about-editorial-cap {
  font-size: 0.8125rem;
  color: var(--mist);
  letter-spacing: 0.04em;
}

/* ---------- 城市球迷圈 ---------- */

.page-about .about-cities-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 34px;
  align-items: start;
}

.page-about .about-cities-copy p {
  margin: 0 0 18px;
  line-height: 1.8;
}

.page-about .about-cities-visual {
  background: var(--ink-800);
  border: 1px solid var(--line-soft);
  border-radius: var(--radius-lg);
  padding: 26px 22px;
}

.page-about .about-node-map {
  display: grid;
  grid-template-columns: repeat(7, 14px);
  gap: 12px;
  justify-content: start;
}

.page-about .about-node {
  width: 14px;
  height: 14px;
  border-radius: 50%;
  background: rgba(34, 230, 210, 0.42);
}

.page-about .about-node:nth-child(5n) {
  background: rgba(34, 230, 210, 0.92);
}

.page-about .about-node:nth-child(11n) {
  background: var(--gold);
  box-shadow: 0 0 0 3px rgba(255, 201, 60, 0.16);
}

.page-about .about-cities-note {
  margin: 20px 0 0;
  font-size: 0.8125rem;
  letter-spacing: 0.04em;
  color: var(--mist);
}

.page-about .about-cities-figure {
  margin: 40px 0 0;
}

/* ---------- 会员三级 ---------- */

.page-about .about-tier {
  background: var(--ink-700);
  border: 1px solid var(--line-soft);
  border-radius: var(--radius-md);
  overflow: hidden;
  transition: border-color var(--dur-fast) var(--ease), transform var(--dur-fast) var(--ease);
}

.page-about .about-tier + .about-tier {
  margin-top: 12px;
}

.page-about .about-tier[open] {
  border-color: var(--line-neon);
}

.page-about .about-tier summary {
  list-style: none;
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: 14px;
  padding: 20px 22px;
  font-weight: 800;
  color: var(--frost);
}

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

.page-about .about-tier summary::after {
  content: "+";
  margin-left: auto;
  font-family: var(--font-num);
  font-size: 1.25rem;
  line-height: 1;
  color: var(--neon);
}

.page-about .about-tier[open] summary::after {
  content: "–";
  color: var(--gold);
}

.page-about .about-tier summary:focus-visible {
  outline: 2px solid var(--gold);
  outline-offset: -3px;
}

.page-about .about-tier-name {
  font-size: 1.125rem;
}

.page-about .about-tier-tag {
  font-size: 0.8125rem;
  font-weight: 500;
  letter-spacing: 0.04em;
  color: var(--mist);
}

.page-about .about-tier-list {
  list-style: none;
  margin: 0;
  padding: 0 22px 22px;
  display: grid;
  gap: 10px;
}

.page-about .about-tier-list li {
  position: relative;
  padding-left: 18px;
  line-height: 1.7;
  color: var(--frost);
}

.page-about .about-tier-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.62em;
  width: 7px;
  height: 7px;
  border-radius: 2px;
  background: var(--neon);
}

.page-about .about-tier:nth-of-type(2) .about-tier-list li::before {
  background: var(--flame);
}

.page-about .about-tier:nth-of-type(3) .about-tier-list li::before {
  background: var(--gold);
}

.page-about .about-membership-note {
  margin: 24px 0 0;
  color: var(--mist);
  line-height: 1.75;
}

/* ---------- 留下来 ---------- */

.page-about .about-reasons {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 14px;
}

.page-about .about-reasons li {
  position: relative;
  background: var(--ink-800);
  border: 1px solid var(--line-soft);
  border-radius: var(--radius-md);
  padding: 26px 22px 24px;
  overflow: hidden;
}

.page-about .about-reasons li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 3px;
  background: linear-gradient(180deg, var(--neon), transparent);
}

.page-about .about-reasons li:nth-child(2)::before {
  background: linear-gradient(180deg, var(--flame), transparent);
}

.page-about .about-reasons li:nth-child(3)::before {
  background: linear-gradient(180deg, var(--gold), transparent);
}

.page-about .about-reason-index {
  display: block;
  font-family: var(--font-num);
  font-variant-numeric: tabular-nums;
  font-size: 0.875rem;
  letter-spacing: 0.08em;
  color: var(--mist);
  margin-bottom: 12px;
}

.page-about .about-reasons h3 {
  margin: 0 0 10px;
  font-size: 1.125rem;
  font-weight: 800;
  color: var(--frost);
}

.page-about .about-reasons p {
  margin: 0;
  color: var(--mist);
  line-height: 1.75;
}

/* ---------- 收尾 ---------- */

.page-about .about-cta {
  padding-bottom: 88px;
}

.page-about .about-cta-inner {
  background:
    linear-gradient(135deg, rgba(34, 230, 210, 0.10), rgba(255, 106, 43, 0.08)),
    var(--ink-800);
  border: 1px solid var(--line-neon);
  border-radius: var(--radius-lg);
  padding: 36px 22px;
}

.page-about .about-cta-inner .section-title {
  margin-top: 0;
}

.page-about .about-cta-inner p {
  margin: 14px 0 24px;
  color: var(--mist);
  line-height: 1.8;
  max-width: 46rem;
}

/* ---------- 响应式 ---------- */

@media (min-width: 720px) {
  .page-about .section {
    padding-block: 84px;
  }

  .page-about .about-timeline li {
    display: grid;
    grid-template-columns: 108px minmax(0, 1fr);
    gap: 26px;
    padding-bottom: 42px;
  }

  .page-about .about-year {
    margin-bottom: 0;
    text-align: right;
  }

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

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

  .page-about .about-reasons {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 18px;
  }

  .page-about .about-cta-inner {
    padding: 48px 40px;
  }
}

@media (min-width: 940px) {
  .page-about {
    --about-gutter: 48px;
  }

  .page-about .about-hero-inner {
    grid-template-columns: 1.05fr 0.95fr;
    gap: 56px;
    padding: 52px var(--about-gutter) 72px;
  }

  .page-about .about-offset {
    margin-left: 16%;
    max-width: 40rem;
  }

  .page-about .about-data-grid {
    grid-template-columns: 6fr 5fr;
    gap: 48px;
  }

  .page-about .about-editorial-grid {
    grid-template-columns: 6fr 5fr;
    gap: 48px;
  }

  .page-about .about-cities-grid {
    grid-template-columns: 6fr 5fr;
    gap: 48px;
  }

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

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

  .page-about .about-reasons li {
    padding: 30px 22px 28px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-tier {
    transition: none;
  }
}
</main>