.page-about {
  --pa-gap: clamp(20px, 3.4vw, 40px);
  --pa-section: clamp(56px, 8vw, 112px);
  --pa-radius: 6px;
  background: var(--ink-900);
  color: var(--ice);
  padding-bottom: var(--pa-section);
}

/* ── 面包屑 ───────────────────────────── */
.page-about .breadcrumb {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: clamp(16px, 2.4vw, 28px) 0 0;
  font-size: var(--fs-12);
  letter-spacing: .14em;
  color: var(--mist);
}
.page-about .breadcrumb__item {
  color: var(--mist);
  text-decoration: none;
}
.page-about .breadcrumb__item:hover,
.page-about .breadcrumb__item:focus-visible {
  color: var(--cyan);
}
.page-about .breadcrumb__current { color: var(--ice); }

/* ── 首屏框景 ─────────────────────────── */
.page-about .about-hero {
  padding: clamp(20px, 3vw, 36px) 0 0;
}
.page-about .about-hero__frame {
  position: relative;
  overflow: hidden;
  padding: clamp(24px, 4vw, 56px);
  background:
    radial-gradient(120% 150% at 92% -10%, rgba(38, 225, 255, .18), transparent 58%),
    radial-gradient(90% 130% at 2% 108%, rgba(255, 91, 34, .14), transparent 62%),
    linear-gradient(180deg, var(--ink-800), var(--ink-900));
}
.page-about .about-hero__kicker {
  margin: 0 0 clamp(14px, 2vw, 22px);
  font-size: var(--fs-12);
  letter-spacing: .22em;
  text-transform: uppercase;
  color: var(--cyan);
}
.page-about .about-hero__title {
  margin: 0 0 clamp(20px, 3vw, 34px);
  max-width: 17em;
  font-size: clamp(32px, 5.6vw, 68px);
  line-height: 1.08;
  letter-spacing: -.02em;
  font-weight: 700;
}
.page-about .about-hero__grid { gap: var(--pa-gap); }
.page-about .about-hero__lead {
  margin: 0 0 14px;
  font-size: var(--fs-16);
  line-height: 1.8;
  max-width: 44ch;
}
.page-about .about-hero__note {
  margin: 0;
  font-size: var(--fs-14);
  line-height: 1.8;
  color: var(--mist);
  max-width: 46ch;
}
.page-about .about-hero__stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin: 0;
  padding: 0;
  list-style: none;
  background: var(--rule);
  border: 1px solid var(--rule);
  border-radius: var(--pa-radius);
  overflow: hidden;
}
.page-about .about-stat {
  display: flex;
  flex-direction: column;
  gap: 4px;
  padding: clamp(14px, 2vw, 20px);
  background: var(--ink-800);
}
.page-about .about-stat__num {
  font-size: var(--fs-28);
  line-height: 1;
  color: var(--pulse);
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
}
.page-about .about-stat__label {
  font-size: var(--fs-12);
  letter-spacing: .06em;
  color: var(--mist);
}

/* ── 章节通用 ─────────────────────────── */
.page-about .about-section {
  padding-top: var(--pa-section);
}
.page-about .about-section .section-head {
  margin-bottom: clamp(24px, 3.4vw, 44px);
}
.page-about .about-figure {
  margin: 0 0 clamp(28px, 4vw, 52px);
  border: 1px solid var(--rule);
  border-radius: var(--pa-radius);
  overflow: hidden;
}
.page-about .about-figure img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
}
.page-about .text-link {
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(38, 225, 255, .4);
}
.page-about .text-link:hover,
.page-about .text-link:focus-visible {
  border-bottom-color: var(--cyan);
}

/* ── 赛季时间轴 ───────────────────────── */
.page-about .season-track {
  display: grid;
  gap: var(--pa-gap);
}
.page-about .season-rail__list {
  display: flex;
  gap: 8px;
  margin: 0;
  padding: 0 0 6px;
  list-style: none;
  overflow-x: auto;
}
.page-about .season-rail__node {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 7px 13px;
  border: 1px solid var(--rule);
  border-radius: 999px;
  white-space: nowrap;
  font-size: var(--fs-14);
  color: var(--mist);
  text-decoration: none;
  background: var(--ink-800);
}
.page-about .season-rail__code { color: var(--cyan); font-size: var(--fs-12); }
.page-about .season-rail__node:hover,
.page-about .season-rail__node:focus-visible {
  border-color: var(--cyan);
  color: var(--ice);
}
.page-about .season-entry {
  padding: clamp(18px, 2.6vw, 28px) 0;
  border-top: 1px solid var(--rule);
  scroll-margin-top: calc(var(--header-h) + 24px);
}
.page-about .season-entry:first-child { border-top: 0; padding-top: 0; }
.page-about .season-entry__meta {
  display: flex;
  align-items: center;
  gap: 12px;
  margin: 0 0 8px;
  flex-wrap: wrap;
}
.page-about .season-entry__num {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: var(--fs-14);
  letter-spacing: .16em;
  color: var(--cyan);
}
.page-about .season-entry h3 {
  margin: 0 0 10px;
  font-size: var(--fs-20);
  line-height: 1.4;
  letter-spacing: -.01em;
}
.page-about .season-entry p {
  margin: 0;
  max-width: 62ch;
  font-size: var(--fs-16);
  line-height: 1.8;
  color: var(--mist);
}
.page-about .season-entry--live {
  border-left: 2px solid var(--lava);
  padding-left: clamp(14px, 2vw, 22px);
}

/* ── 赛区 ─────────────────────────────── */
.page-about .zone-layout {
  display: grid;
  gap: var(--pa-gap);
}
.page-about .zone-map {
  padding: clamp(16px, 2.4vw, 28px);
  background:
    radial-gradient(90% 100% at 50% 0%, rgba(38, 225, 255, .1), transparent 60%),
    var(--ink-800);
}
.page-about .zone-map__svg {
  display: block;
  width: 100%;
  height: auto;
}
.page-about .zm-line { stroke: var(--rule); stroke-width: 1; }
.page-about .zm-hub {
  fill: rgba(38, 225, 255, .07);
  stroke: var(--cyan);
  stroke-width: 1;
}
.page-about .zm-hub-num {
  fill: var(--pulse);
  font-family: var(--font-mono);
  font-size: 34px;
  font-weight: 700;
}
.page-about .zm-hub-label {
  fill: var(--mist);
  font-size: 13px;
  letter-spacing: .12em;
}
.page-about .zm-dot { fill: var(--lava); }
.page-about .zm-label {
  fill: var(--ice);
  font-size: 15px;
  letter-spacing: .08em;
}
.page-about .zm-caption {
  fill: var(--mist);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .1em;
}
.page-about .zone-cards {
  display: grid;
  gap: 1px;
  background: var(--rule);
  border: 1px solid var(--rule);
  border-radius: var(--pa-radius);
  overflow: hidden;
}
.page-about .zone-card {
  padding: clamp(18px, 2.6vw, 26px);
  background: var(--ink-800);
  transition: background .22s var(--ease);
}
.page-about .zone-card:hover,
.page-about .zone-card:focus-within {
  background: var(--ink-700);
}
.page-about .zone-card__head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  margin-bottom: 10px;
}
.page-about .zone-card h3 {
  margin: 0;
  font-size: var(--fs-20);
  letter-spacing: -.01em;
}
.page-about .zone-card p {
  margin: 0 0 12px;
  font-size: var(--fs-14);
  line-height: 1.78;
  color: var(--mist);
}
.page-about .zone-card__list {
  margin: 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 6px;
}
.page-about .zone-card__list li {
  position: relative;
  padding-left: 16px;
  font-size: var(--fs-14);
  line-height: 1.7;
  color: var(--ice);
}
.page-about .zone-card__list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: .62em;
  width: 6px;
  height: 1px;
  background: var(--cyan);
}
.page-about .about-figure--zone { margin: 0; }

/* ── 组织架构 ─────────────────────────── */
.page-about .org-grid {
  display: grid;
  gap: 1px;
  background: var(--rule);
  border: 1px solid var(--rule);
  border-radius: var(--pa-radius);
  overflow: hidden;
}
.page-about .org-cell {
  padding: clamp(20px, 3vw, 32px);
  background: var(--ink-800);
}
.page-about .org-cell__num {
  margin: 0 0 10px;
  font-family: var(--font-mono);
  font-size: var(--fs-12);
  letter-spacing: .2em;
  color: var(--lava);
}
.page-about .org-cell h3 {
  margin: 0 0 10px;
  font-size: var(--fs-20);
  letter-spacing: -.01em;
}
.page-about .org-cell p {
  margin: 0;
  font-size: var(--fs-14);
  line-height: 1.8;
  color: var(--mist);
}
.page-about .org-aside {
  margin-top: clamp(24px, 3.4vw, 44px);
  gap: var(--pa-gap);
}
.page-about .org-aside .about-figure { margin: 0; }
.page-about .org-aside__note {
  margin: 0;
  font-size: var(--fs-14);
  line-height: 1.85;
  color: var(--mist);
  max-width: 46ch;
  align-self: center;
}

/* ── 办赛标准 ─────────────────────────── */
.page-about .standards-grid { gap: var(--pa-gap); }
.page-about .standards-lead {
  margin: 0 0 clamp(18px, 2.6vw, 26px);
  font-size: var(--fs-16);
  line-height: 1.85;
  max-width: 60ch;
}
.page-about .about-details {
  margin-bottom: 12px;
  padding: 0 clamp(16px, 2.2vw, 24px);
  border: 1px solid var(--rule);
  border-radius: var(--pa-radius);
  background: var(--ink-800);
}
.page-about .about-details summary {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 16px 0;
  cursor: pointer;
  list-style: none;
  font-size: var(--fs-16);
  font-weight: 600;
  color: var(--ice);
}
.page-about .about-details summary::-webkit-details-marker { display: none; }
.page-about .about-details summary::after {
  content: "＋";
  font-family: var(--font-mono);
  color: var(--cyan);
  flex: none;
}
.page-about .about-details[open] summary::after { content: "－"; }
.page-about .about-details__body {
  padding: 0 0 18px;
  border-top: 1px solid var(--rule);
  padding-top: 16px;
}
.page-about .about-details__body ul {
  margin: 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 12px;
}
.page-about .about-details__body li {
  font-size: var(--fs-14);
  line-height: 1.82;
  color: var(--mist);
  padding-left: 16px;
  position: relative;
}
.page-about .about-details__body li::before {
  content: "";
  position: absolute;
  left: 0;
  top: .68em;
  width: 6px;
  height: 1px;
  background: var(--lava);
}
.page-about .about-details__body strong { color: var(--ice); }
.page-about .about-details__foot {
  margin: 14px 0 0;
  font-size: var(--fs-14);
  line-height: 1.8;
  color: var(--mist);
}
.page-about .standards-side {
  padding: clamp(20px, 3vw, 30px);
  background: linear-gradient(160deg, rgba(108, 92, 231, .16), transparent 60%), var(--ink-800);
  align-self: start;
}
.page-about .standards-side h3 {
  margin: 0 0 12px;
  font-size: var(--fs-20);
  letter-spacing: -.01em;
}
.page-about .standards-side p {
  margin: 0 0 14px;
  font-size: var(--fs-14);
  line-height: 1.82;
  color: var(--mist);
}
.page-about .standards-side__meta {
  margin: 0;
  font-family: var(--font-mono);
  font-size: var(--fs-12);
  letter-spacing: .1em;
  color: var(--pulse);
}

/* ── 数据与内容流程 ───────────────────── */
.page-about .flow {
  display: grid;
  gap: clamp(18px, 2.6vw, 28px);
}
.page-about .flow__step {
  position: relative;
  padding-top: 26px;
  border-top: 1px solid var(--rule);
}
.page-about .flow__step::before {
  content: "";
  position: absolute;
  top: -4px;
  left: 0;
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--cyan);
}
.page-about .flow__num {
  margin: 0 0 8px;
  font-family: var(--font-mono);
  font-size: var(--fs-14);
  letter-spacing: .18em;
  color: var(--lava);
}
.page-about .flow__step h3 {
  margin: 0 0 8px;
  font-size: var(--fs-20);
  letter-spacing: -.01em;
}
.page-about .flow__step p {
  margin: 0;
  font-size: var(--fs-14);
  line-height: 1.82;
  color: var(--mist);
}
.page-about .data-note {
  margin-top: clamp(22px, 3vw, 36px);
  padding: clamp(18px, 2.6vw, 28px);
  border-left: 2px solid var(--cyan);
}
.page-about .data-note p {
  margin: 0;
  font-size: var(--fs-14);
  line-height: 1.85;
  color: var(--mist);
  max-width: 74ch;
}

/* ── 下个赛季 ─────────────────────────── */
.page-about .next-list {
  display: grid;
  gap: 1px;
  background: var(--rule);
  border: 1px solid var(--rule);
  border-radius: var(--pa-radius);
  overflow: hidden;
}
.page-about .next-card {
  padding: clamp(20px, 3vw, 30px);
  background: var(--ink-800);
}
.page-about .next-card__num {
  margin: 0 0 10px;
  font-family: var(--font-mono);
  font-size: var(--fs-12);
  letter-spacing: .2em;
  color: var(--cyan);
}
.page-about .next-card h3 {
  margin: 0 0 10px;
  font-size: var(--fs-20);
  letter-spacing: -.01em;
}
.page-about .next-card p {
  margin: 0;
  font-size: var(--fs-14);
  line-height: 1.82;
  color: var(--mist);
}

/* ── 结尾行动区 ───────────────────────── */
.page-about .about-cta {
  display: grid;
  gap: clamp(20px, 3vw, 36px);
  padding: clamp(24px, 4vw, 48px);
  border: 1px solid var(--rule);
  border-radius: var(--pa-radius);
  background:
    linear-gradient(120deg, rgba(38, 225, 255, .14), rgba(255, 91, 34, .1) 62%, transparent),
    var(--ink-800);
}
.page-about .about-cta__kicker {
  margin: 0 0 12px;
  font-size: var(--fs-12);
  letter-spacing: .22em;
  color: var(--cyan);
}
.page-about .about-cta h2 {
  margin: 0 0 12px;
  font-size: clamp(24px, 3.2vw, 40px);
  line-height: 1.2;
  letter-spacing: -.02em;
}
.page-about .about-cta p {
  margin: 0;
  font-size: var(--fs-14);
  line-height: 1.85;
  color: var(--mist);
  max-width: 62ch;
}
.page-about .about-cta__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  align-content: start;
}

/* ── 响应式 ───────────────────────────── */
@media (min-width: 700px) {
  .page-about .about-hero__stats { grid-template-columns: repeat(3, minmax(0, 1fr)); }
  .page-about .zone-cards { grid-template-columns: repeat(3, minmax(0, 1fr)); }
  .page-about .org-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .page-about .next-list { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .page-about .about-cta { grid-template-columns: minmax(0, 7fr) minmax(0, 5fr); align-items: end; }
}

@media (min-width: 960px) {
  .page-about .season-track {
    grid-template-columns: 200px minmax(0, 1fr);
    gap: clamp(28px, 4vw, 60px);
  }
  .page-about .season-rail {
    position: sticky;
    top: calc(var(--header-h) + 28px);
    align-self: start;
  }
  .page-about .season-rail__list {
    flex-direction: column;
    gap: 0;
    overflow: visible;
    padding: 0;
    position: relative;
  }
  .page-about .season-rail__list::before {
    content: "";
    position: absolute;
    left: 7px;
    top: 14px;
    bottom: 14px;
    width: 1px;
    background: var(--rule);
  }
  .page-about .season-rail__node {
    position: relative;
    width: 100%;
    padding: 9px 0 9px 26px;
    border: 0;
    border-radius: 0;
    background: transparent;
    white-space: normal;
  }
  .page-about .season-rail__node::before {
    content: "";
    position: absolute;
    left: 2px;
    top: 50%;
    transform: translateY(-50%);
    width: 11px;
    height: 11px;
    border-radius: 50%;
    border: 1px solid var(--rule);
    background: var(--ink-900);
  }
  .page-about .season-rail__node:hover::before,
  .page-about .season-rail__node:focus-visible::before {
    border-color: var(--cyan);
    background: var(--cyan);
  }
  .page-about .zone-layout {
    grid-template-columns: minmax(0, 8fr) minmax(0, 4fr);
    align-items: start;
  }
  .page-about .zone-map { grid-column: 1 / -1; }
  .page-about .zone-cards { grid-column: 1 / -1; }
  .page-about .about-figure--zone {
    grid-column: 1 / -1;
    max-width: 460px;
  }
  .page-about .flow { grid-template-columns: repeat(4, minmax(0, 1fr)); }
  .page-about .org-grid { grid-template-columns: repeat(4, minmax(0, 1fr)); }
  .page-about .next-list { grid-template-columns: repeat(4, minmax(0, 1fr)); }
}

@media (min-width: 1200px) {
  .page-about .zone-layout {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
  }
  .page-about .zone-map { grid-column: 1 / 2; }
  .page-about .zone-cards {
    grid-column: 2 / 3;
    grid-template-columns: minmax(0, 1fr);
  }
  .page-about .about-figure--zone {
    grid-column: 1 / 3;
    margin-top: clamp(18px, 2.4vw, 28px);
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .zone-card { transition: none; }
}