.page-about {
  background: var(--c-ink);
  color: var(--c-white);
  overflow-x: clip;
}

/* ---------- 面包屑 ---------- */
.page-about .about-crumbs {
  padding-block: 1.35rem 0.5rem;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  display: flex;
  align-items: flex-end;
  min-height: clamp(26rem, 68vh, 40rem);
  margin-top: 0.5rem;
  overflow: hidden;
}

.page-about .about-hero-visual {
  position: absolute;
  inset: 0;
  z-index: 0;
}

.page-about .about-hero-visual img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: center 32%;
}

.page-about .about-hero-visual::after {
  content: "";
  position: absolute;
  inset: 0;
  background:
    linear-gradient(180deg, rgba(10, 16, 32, 0.42) 0%, rgba(10, 16, 32, 0.7) 46%, #0A1020 100%),
    linear-gradient(104deg, rgba(10, 16, 32, 0.94) 0%, rgba(10, 16, 32, 0.52) 52%, rgba(10, 16, 32, 0.12) 100%);
}

.page-about .about-hero-inner {
  position: relative;
  z-index: 1;
  width: 100%;
  padding-block: clamp(3rem, 9vw, 6.5rem) clamp(2.25rem, 5vw, 3.75rem);
}

.page-about .about-title {
  margin: 0.6rem 0 1.35rem;
  max-width: 46rem;
  font-family: var(--font-head);
  font-weight: 900;
  font-size: clamp(1.9rem, 5.6vw, 4rem);
  line-height: 1.04;
  letter-spacing: -0.02em;
}

.page-about .about-lead {
  max-width: 42rem;
  margin: 0;
  font-size: clamp(0.98rem, 1.2vw, 1.1rem);
  line-height: 1.85;
  color: rgba(255, 255, 255, 0.82);
}

.page-about .hero-facts {
  display: flex;
  flex-wrap: wrap;
  gap: 1.35rem clamp(1.5rem, 5vw, 3.5rem);
  max-width: 46rem;
  margin: 2.25rem 0 0;
  padding: 1.5rem 0 0;
  list-style: none;
  border-top: 1px solid rgba(255, 255, 255, 0.16);
}

.page-about .hero-fact {
  display: flex;
  flex-direction: column;
  gap: 0.3rem;
}

.page-about .hero-fact-value {
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: clamp(1.35rem, 3vw, 1.9rem);
  line-height: 1;
  color: var(--c-orange);
  letter-spacing: -0.01em;
}

.page-about .hero-fact-value small {
  font-size: 0.5em;
  margin-left: 0.06em;
}

.page-about .hero-fact-label {
  font-size: 0.72rem;
  letter-spacing: 0.1em;
  color: var(--c-muted);
}

/* ---------- 主体栅格 ---------- */
.page-about .about-body {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  padding-block: 0 clamp(3rem, 8vw, 6rem);
}

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

/* ---------- 粘性侧栏 ---------- */
.page-about .year-rail {
  display: none;
}

.page-about .rail-label {
  margin: 0 0 1rem;
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--c-muted);
}

.page-about .rail-list {
  margin: 0;
  padding: 0;
  list-style: none;
  border-left: 1px solid var(--c-line);
}

.page-about .rail-item + .rail-item {
  margin-top: 0.15rem;
}

.page-about .rail-link {
  display: flex;
  align-items: center;
  gap: 0.55rem;
  margin-left: -1px;
  padding: 0.45rem 0 0.45rem 1rem;
  border-left: 2px solid transparent;
  text-decoration: none;
  color: var(--c-muted);
  font-size: 0.86rem;
  line-height: 1.4;
  transition: color var(--dur-2) var(--ease), border-color var(--dur-2) var(--ease);
}

.page-about .rail-link:hover,
.page-about .rail-link:focus-visible {
  color: var(--c-white);
  border-left-color: var(--c-yellow);
}

.page-about .rail-num {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  font-weight: 700;
  color: var(--c-orange);
  flex: none;
}

.page-about .rail-text {
  min-width: 0;
}

@media (min-width: 1080px) {
  .page-about .about-body {
    grid-template-columns: 13.5rem minmax(0, 1fr);
    column-gap: clamp(2.5rem, 5vw, 4.5rem);
    align-items: start;
  }

  .page-about .year-rail {
    display: block;
    position: sticky;
    top: 6.5rem;
    padding-block: clamp(3rem, 6vw, 4.5rem) 0;
  }
}

/* ---------- 章节通用 ---------- */
.page-about .about-section {
  padding-block: clamp(2.75rem, 6vw, 4.75rem);
  border-top: 1px solid var(--c-line);
}

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

.page-about .sec-head {
  display: flex;
  align-items: baseline;
  gap: 0.85rem;
  margin-bottom: clamp(1.25rem, 3vw, 1.9rem);
}

.page-about .sec-index {
  flex: none;
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: 0.75rem;
  letter-spacing: 0.06em;
  color: var(--c-orange);
}

.page-about .sec-title {
  margin: 0;
  font-family: var(--font-head);
  font-weight: 900;
  font-size: clamp(1.4rem, 3.4vw, 2.3rem);
  line-height: 1.2;
  letter-spacing: -0.01em;
}

.page-about .flow-p {
  max-width: 42rem;
  margin: 0 0 1.15rem;
  font-size: 1rem;
  line-height: 1.85;
  color: var(--c-muted);
}

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

/* ---------- 赛事标签 ---------- */
.page-about .league-tags {
  margin: 0 0 1.6rem;
}

/* ---------- 收录规模 ---------- */
.page-about .coverage-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: clamp(1.35rem, 3.5vw, 2.25rem);
  margin: clamp(1.75rem, 4vw, 2.5rem) 0 0;
  padding: clamp(1.5rem, 3vw, 2rem) 0 0;
  list-style: none;
  border-top: 1px dashed var(--c-line);
}

.page-about .coverage-cell {
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
  min-width: 0;
}

.page-about .coverage-cell .stat-value {
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: clamp(1.7rem, 4.4vw, 2.5rem);
  line-height: 1;
  color: var(--c-white);
  letter-spacing: -0.02em;
}

.page-about .coverage-cell .stat-value--accent {
  color: var(--c-orange);
}

.page-about .coverage-cell .stat-value small {
  font-size: 0.46em;
  margin-left: 0.06em;
}

.page-about .coverage-cell .stat-label {
  font-size: 0.8rem;
  line-height: 1.5;
  color: var(--c-muted);
}

@media (min-width: 700px) {
  .page-about .coverage-grid {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

/* ---------- 三类内容 ---------- */
.page-about .stream-list {
  margin-top: 1.25rem;
  border-top: 1px solid var(--c-line);
}

.page-about .stream-item {
  display: grid;
  gap: 0.6rem;
  padding-block: clamp(1.5rem, 3.5vw, 2.15rem);
  border-bottom: 1px solid var(--c-line);
}

.page-about .stream-body {
  min-width: 0;
}

.page-about .stream-title {
  margin: 0;
  font-family: var(--font-head);
  font-weight: 900;
  font-size: 1.05rem;
  line-height: 1.5;
  letter-spacing: 0.005em;
  color: var(--c-white);
}

.page-about .stream-mark {
  display: block;
  margin-bottom: 0.45rem;
  font-family: var(--font-mono);
  font-size: 0.68rem;
  font-weight: 700;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--c-yellow);
}

.page-about .stream-text {
  max-width: 38rem;
  margin: 0 0 0.85rem;
  font-size: 0.95rem;
  line-height: 1.85;
  color: var(--c-muted);
}

.page-about .stream-text:last-child {
  margin-bottom: 0;
}

@media (min-width: 768px) {
  .page-about .stream-item {
    grid-template-columns: 12.5rem minmax(0, 1fr);
    gap: 2.25rem;
    align-items: start;
  }
}

/* ---------- 年份演进 ---------- */
.page-about .timeline-section {
  position: relative;
  isolation: isolate;
}

.page-about .tl-bg {
  position: absolute;
  inset: 0;
  z-index: 0;
  overflow: hidden;
  opacity: 0.18;
}

.page-about .tl-bg img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.page-about .tl-bg::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, var(--c-ink) 0%, rgba(10, 16, 32, 0.45) 45%, var(--c-ink) 100%);
}

.page-about .timeline-section > *:not(.tl-bg) {
  position: relative;
  z-index: 1;
}

.page-about .span-chart {
  margin: clamp(1.75rem, 4vw, 2.5rem) 0 0;
}

.page-about .chart-caption {
  margin-bottom: 1rem;
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--c-muted);
}

.page-about .chart {
  display: grid;
  grid-auto-flow: column;
  grid-auto-columns: minmax(0, 1fr);
  gap: clamp(0.35rem, 1.4vw, 0.9rem);
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .chart-col {
  display: grid;
  grid-template-rows: auto 10rem auto;
  gap: 0.5rem;
  align-items: end;
  justify-items: center;
  min-width: 0;
}

.page-about .chart-value {
  font-family: var(--font-mono);
  font-size: 0.64rem;
  font-weight: 700;
  color: var(--c-muted);
  white-space: nowrap;
  transition: color var(--dur-2) var(--ease);
}

.page-about .chart-track {
  display: flex;
  align-items: flex-end;
  width: 100%;
  height: 100%;
  background: rgba(38, 50, 74, 0.42);
  border-bottom: 1px solid var(--c-line);
}

.page-about .chart-bar {
  display: block;
  width: 100%;
  background: linear-gradient(180deg, var(--c-orange), #A83F09);
  transition: background var(--dur-3) var(--ease);
}

.page-about .chart-col:nth-child(1) .chart-bar { height: 36%; }
.page-about .chart-col:nth-child(2) .chart-bar { height: 77%; }
.page-about .chart-col:nth-child(3) .chart-bar { height: 64%; }
.page-about .chart-col:nth-child(4) .chart-bar { height: 83%; }
.page-about .chart-col:nth-child(5) .chart-bar { height: 90%; }
.page-about .chart-col:nth-child(6) .chart-bar { height: 95%; }
.page-about .chart-col:nth-child(7) .chart-bar { height: 100%; }
.page-about .chart-col:nth-child(8) .chart-bar { height: 60%; }

.page-about .chart-col:hover .chart-bar,
.page-about .chart-col:focus-within .chart-bar {
  background: linear-gradient(180deg, var(--c-yellow), var(--c-orange));
}

.page-about .chart-col:hover .chart-value,
.page-about .chart-col:focus-within .chart-value {
  color: var(--c-white);
}

.page-about .chart-year {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  font-weight: 700;
  letter-spacing: 0.02em;
  color: var(--c-muted);
}

.page-about .chart-note {
  margin: 1rem 0 0;
  font-size: 0.8rem;
  line-height: 1.7;
  color: var(--c-muted);
}

.page-about .tl-list {
  position: relative;
  margin: clamp(2.25rem, 5vw, 3.25rem) 0 0;
  padding: 0;
  list-style: none;
}

.page-about .tl-list::before {
  content: "";
  position: absolute;
  left: 5px;
  top: 0.7rem;
  bottom: 0.7rem;
  width: 1px;
  background: var(--c-line);
}

.page-about .tl-item {
  position: relative;
  display: grid;
  gap: 0.4rem;
  padding: 0 0 clamp(1.6rem, 3.5vw, 2.25rem) 1.9rem;
}

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

.page-about .tl-item::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.4rem;
  width: 11px;
  height: 11px;
  border-radius: 50%;
  background: var(--c-yellow);
  box-shadow: 0 0 0 4px rgba(237, 255, 74, 0.14);
}

.page-about .tl-year {
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: 1.02rem;
  letter-spacing: 0.03em;
  color: var(--c-yellow);
}

.page-about .tl-body {
  min-width: 0;
}

.page-about .tl-title {
  margin: 0 0 0.35rem;
  font-family: var(--font-head);
  font-weight: 900;
  font-size: 1rem;
  line-height: 1.5;
  color: var(--c-white);
}

.page-about .tl-text {
  max-width: 38rem;
  margin: 0;
  font-size: 0.92rem;
  line-height: 1.8;
  color: var(--c-muted);
}

@media (min-width: 768px) {
  .page-about .tl-item {
    grid-template-columns: 7.5rem minmax(0, 1fr);
    gap: 1.5rem;
    padding-left: 2.35rem;
  }
}

/* ---------- 团队 ---------- */
.page-about .team-grid {
  display: grid;
  gap: clamp(1.75rem, 4vw, 3rem);
  align-items: start;
}

.page-about .team-copy {
  min-width: 0;
}

.page-about .team-stats {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(6rem, 1fr));
  gap: clamp(1.1rem, 3vw, 1.75rem);
  margin: 1.85rem 0 0;
  padding: 1.4rem 0 0;
  list-style: none;
  border-top: 1px dashed var(--c-line);
}

.page-about .team-stat {
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
  min-width: 0;
}

.page-about .team-stat .stat-value {
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: clamp(1.5rem, 3.6vw, 2.1rem);
  line-height: 1;
  color: var(--c-green);
}

.page-about .team-stat .stat-value small {
  font-size: 0.46em;
  margin-left: 0.06em;
}

.page-about .team-stat .stat-label {
  font-size: 0.78rem;
  line-height: 1.5;
  color: var(--c-muted);
}

.page-about .team-media {
  margin: 0;
}

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

@media (min-width: 900px) {
  .page-about .team-grid {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1.05fr);
  }
}

/* ---------- 反馈与合作 ---------- */
.page-about .route-grid {
  display: grid;
  gap: 1.35rem;
  margin-top: 1.75rem;
}

.page-about .route-card {
  position: relative;
  padding: 1.6rem 1.4rem 1.85rem;
  background: var(--c-panel);
  clip-path: polygon(0 0, calc(100% - 18px) 0, 100% 18px, 100% 100%, 18px 100%, 0 calc(100% - 18px));
}

.page-about .route-key {
  display: block;
  margin-bottom: 0.7rem;
  font-family: var(--font-mono);
  font-size: 0.68rem;
  font-weight: 700;
  letter-spacing: 0.16em;
  color: var(--c-orange);
}

.page-about .route-title {
  margin: 0 0 0.65rem;
  font-family: var(--font-head);
  font-weight: 900;
  font-size: 1.08rem;
  line-height: 1.45;
  color: var(--c-white);
}

.page-about .route-text {
  margin: 0 0 1.1rem;
  font-size: 0.9rem;
  line-height: 1.78;
  color: var(--c-muted);
}

.page-about .route-link {
  display: inline-block;
  padding-bottom: 2px;
  font-size: 0.88rem;
  font-weight: 700;
  color: var(--c-yellow);
  text-decoration: none;
  border-bottom: 1px solid rgba(237, 255, 74, 0.42);
  transition: border-color var(--dur-2) var(--ease);
}

.page-about .route-link:hover,
.page-about .route-link:focus-visible {
  border-bottom-color: var(--c-yellow);
}

@media (min-width: 780px) {
  .page-about .route-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 1.25rem;
  }
}

.page-about .contact-band {
  display: grid;
  gap: 1.1rem;
  margin-top: clamp(2rem, 4.5vw, 2.75rem);
  padding: clamp(1.35rem, 3vw, 1.85rem) 0 0;
  border-top: 1px solid var(--c-line);
}

.page-about .contact-band .contact-item {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 0.35rem 1rem;
  min-width: 0;
}

.page-about .contact-band .contact-key {
  flex: none;
  min-width: 3.4rem;
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.14em;
  color: var(--c-muted);
}

.page-about .contact-band .contact-value {
  font-size: 0.92rem;
  line-height: 1.7;
  color: var(--c-white);
  word-break: break-word;
}

.page-about .contact-note {
  max-width: 42rem;
  margin: 1.4rem 0 1.6rem;
  font-size: 0.86rem;
  line-height: 1.75;
  color: var(--c-muted);
}

@media (min-width: 780px) {
  .page-about .contact-band {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 1.25rem;
  }

  .page-about .contact-band .contact-item {
    flex-direction: column;
    gap: 0.35rem;
  }
}

/* ---------- 辅助 ---------- */
.page-about .mono {
  font-family: var(--font-mono);
}

.page-about img {
  max-width: 100%;
  height: auto;
}

@media (min-width: 1080px) {
  .page-about .about-title {
    max-width: 40rem;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .rail-link,
  .page-about .chart-bar,
  .page-about .chart-value,
  .page-about .route-link {
    transition: none;
  }
}