.page-about {
  --about-sec-gap: clamp(56px, 8vw, 104px);
  --about-card-bg: var(--ink-800);
}

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

.page-about .about-mast {
  position: relative;
  overflow: hidden;
  padding: clamp(78px, 10vw, 132px) 0 clamp(34px, 5vw, 60px);
}

.page-about .about-mast::before {
  content: "";
  position: absolute;
  inset: -14% -12% auto 42%;
  height: 520px;
  background: radial-gradient(48% 48% at 50% 50%, rgba(53, 240, 198, 0.15), transparent 72%);
  pointer-events: none;
}

.page-about .about-mast .wrap {
  position: relative;
  z-index: 1;
}

.page-about .eyebrow {
  margin: clamp(20px, 3vw, 34px) 0 0;
  color: var(--cyan-400);
}

.page-about h1 {
  margin: 12px 0 0;
  font-family: var(--font-cn);
  font-weight: 600;
  font-size: clamp(30px, 5.6vw, 62px);
  line-height: 1.14;
  letter-spacing: -0.01em;
  color: var(--chalk);
  max-width: 18ch;
}

.page-about .lede {
  margin-top: 20px;
  max-width: 64ch;
  color: var(--mist-100);
  font-size: 15px;
  line-height: 1.85;
}

.page-about .mast-stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 22px 18px;
  margin-top: clamp(30px, 4vw, 46px);
  padding-top: clamp(24px, 3vw, 34px);
  border-top: 1px solid var(--ink-700);
}

.page-about .mast-stats .stat {
  display: grid;
  gap: 4px;
  min-width: 0;
}

.page-about .stat-unit {
  font-size: 0.46em;
  margin-left: 0.1em;
  color: var(--slate-400);
  letter-spacing: 0;
}

.page-about .mast-stats .stat-num {
  font-family: var(--font-display);
  font-weight: 700;
  font-variant-numeric: tabular-nums;
  font-size: clamp(38px, 7vw, 68px);
  line-height: 0.9;
  letter-spacing: -0.02em;
  color: var(--chalk);
}

.page-about .mast-stats .stat-num--sm {
  font-size: clamp(30px, 5.4vw, 52px);
}

.page-about .mast-stats .stat-label {
  font-size: 13px;
  letter-spacing: 0.06em;
  color: var(--slate-400);
}

.page-about .about-toc {
  margin-top: clamp(34px, 5vw, 58px);
}

.page-about .toc-title {
  margin: 0 0 12px;
  font-size: 13px;
  letter-spacing: 0.12em;
  color: var(--slate-400);
}

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

.page-about .toc-list a {
  display: inline-flex;
  align-items: baseline;
  gap: 8px;
  padding: 9px 14px;
  background: var(--ink-800);
  border: 1px solid var(--ink-700);
  color: var(--mist-100);
  font-size: 13px;
  letter-spacing: 0.02em;
  text-decoration: none;
  clip-path: polygon(10px 0, 100% 0, 100% calc(100% - 10px), calc(100% - 10px) 100%, 0 100%, 0 10px);
  transition: background 0.2s var(--ease-out), color 0.2s var(--ease-out), border-color 0.2s var(--ease-out);
}

.page-about .toc-list a:hover,
.page-about .toc-list a:focus-visible {
  background: var(--cyan-400);
  border-color: var(--cyan-400);
  color: var(--ink-950);
}

.page-about .toc-idx {
  font-family: var(--font-display);
  font-weight: 700;
  font-variant-numeric: tabular-nums;
  opacity: 0.65;
}

.page-about .sec {
  position: relative;
  padding: clamp(44px, 6vw, 78px) 0;
  scroll-margin-top: calc(var(--header-h) + 24px);
}

.page-about .sec--seasons::before,
.page-about .sec--partner::before {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  top: 0;
  height: 8px;
  background: linear-gradient(90deg, var(--cyan-400), rgba(53, 240, 198, 0.05) 62%, transparent);
}

.page-about .sec--team {
  background: linear-gradient(180deg, rgba(18, 54, 44, 0.72), rgba(10, 38, 32, 0));
}

.page-about .sec-head {
  position: relative;
  display: grid;
  grid-template-columns: 1fr;
  gap: 10px;
  margin-bottom: clamp(22px, 3vw, 40px);
}

.page-about .big-num {
  font-family: var(--font-display);
  font-weight: 700;
  font-variant-numeric: tabular-nums;
  font-size: clamp(44px, 9vw, 92px);
  line-height: 0.82;
  letter-spacing: -0.03em;
  color: transparent;
  -webkit-text-stroke: 1px var(--ink-700);
}

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

.page-about .sec-head h2 {
  margin: 0;
  font-family: var(--font-cn);
  font-weight: 600;
  font-size: clamp(23px, 3.2vw, 38px);
  line-height: 1.24;
  color: var(--chalk);
}

.page-about .sec-lede {
  margin: 10px 0 0;
  max-width: 62ch;
  color: var(--slate-400);
  font-size: 15px;
  line-height: 1.7;
}

.page-about .prose {
  max-width: 660px;
  min-width: 0;
}

.page-about .prose p {
  margin: 0 0 1em;
  color: var(--mist-100);
  font-size: 15px;
  line-height: 1.8;
}

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

.page-about .split {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(26px, 4vw, 48px);
  align-items: start;
}

.page-about .coverage-panel {
  min-width: 0;
}

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

.page-about .coverage-list li {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 14px;
  align-items: baseline;
  padding: 13px 0;
  border-bottom: 1px solid var(--ink-700);
}

.page-about .coverage-list li:last-child {
  border-bottom: 0;
}

.page-about .cov-key {
  font-size: 14px;
  color: var(--slate-400);
}

.page-about .cov-val {
  font-size: 14px;
  color: var(--chalk);
  text-align: right;
}

.page-about .cov-val.num-text {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 20px;
  color: var(--cyan-400);
}

.page-about .media {
  margin: 0;
  min-width: 0;
}

.page-about .media img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
  border: 1px solid var(--ink-700);
}

.page-about .media--wide {
  margin-bottom: clamp(28px, 4vw, 48px);
}

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

.page-about .media--tall img {
  aspect-ratio: 3 / 2;
}

.page-about .media--square img {
  aspect-ratio: 1 / 1;
}

.page-about .media-caption {
  margin-top: 10px;
  font-size: 13px;
  line-height: 1.6;
  color: var(--slate-400);
}

/* ---- 时间轴 ---- */
.page-about .timeline {
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .tl-item {
  position: relative;
  padding: 0 0 clamp(28px, 4vw, 42px) 34px;
}

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

.page-about .tl-item::before {
  content: "";
  position: absolute;
  left: 7px;
  top: 8px;
  bottom: 0;
  width: 2px;
  background: linear-gradient(180deg, var(--ink-700), rgba(27, 74, 60, 0.12));
}

.page-about .tl-item:last-child::before {
  display: none;
}

.page-about .tl-item::after {
  content: "";
  position: absolute;
  left: 1px;
  top: 6px;
  width: 14px;
  height: 14px;
  border-radius: 50%;
  background: var(--ink-900);
  border: 2px solid var(--cyan-400);
  box-shadow: 0 0 0 4px rgba(53, 240, 198, 0.12);
}

.page-about .tl-item--accent::after {
  border-color: var(--orange-500);
  box-shadow: 0 0 0 4px rgba(255, 138, 61, 0.14);
}

.page-about .tl-mark {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 10px;
  margin-bottom: 6px;
}

.page-about .tl-stage {
  font-size: 13px;
  letter-spacing: 0.14em;
  color: var(--cyan-400);
}

.page-about .tl-item--accent .tl-stage {
  color: var(--orange-500);
}

.page-about .tl-span {
  font-family: var(--font-display);
  font-weight: 700;
  font-variant-numeric: tabular-nums;
  font-size: 15px;
  letter-spacing: 0.02em;
  color: var(--slate-400);
}

.page-about .tl-body h3 {
  margin: 0 0 6px;
  font-family: var(--font-cn);
  font-weight: 600;
  font-size: clamp(17px, 2.2vw, 21px);
  line-height: 1.35;
  color: var(--chalk);
}

.page-about .tl-body p {
  margin: 0;
  max-width: 60ch;
  color: var(--mist-100);
  font-size: 15px;
  line-height: 1.75;
}

/* ---- 数据卡片 ---- */
.page-about .split--reverse {
  margin-bottom: clamp(28px, 4vw, 46px);
}

.page-about .data-cards {
  gap: 14px;
}

.page-about .data-card {
  min-width: 0;
}

.page-about .data-card-num {
  display: block;
  font-family: var(--font-display);
  font-weight: 700;
  font-variant-numeric: tabular-nums;
  font-size: clamp(30px, 4.6vw, 42px);
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--cyan-400);
}

.page-about .data-card--accent .data-card-num {
  color: var(--orange-500);
}

.page-about .data-card h3 {
  margin: 12px 0 6px;
  font-family: var(--font-cn);
  font-weight: 600;
  font-size: 16px;
  color: var(--chalk);
}

.page-about .data-card p {
  margin: 0;
  font-size: 14px;
  line-height: 1.65;
  color: var(--slate-400);
}

/* ---- 团队 ---- */
.page-about .team-col {
  display: grid;
  gap: clamp(22px, 3vw, 34px);
  min-width: 0;
}

.page-about .bars {
  display: grid;
  gap: 22px;
}

.page-about .bar-row {
  min-width: 0;
}

.page-about .bar-head {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  justify-content: space-between;
  gap: 10px;
  margin-bottom: 8px;
}

.page-about .bar-name {
  font-family: var(--font-cn);
  font-weight: 600;
  font-size: 16px;
  color: var(--chalk);
}

.page-about .bar-num {
  font-family: var(--font-display);
  font-weight: 700;
  font-variant-numeric: tabular-nums;
  font-size: 20px;
  color: var(--cyan-200);
}

.page-about .bar-track {
  height: 14px;
  background: var(--ink-800);
  border: 1px solid var(--ink-700);
  overflow: hidden;
  clip-path: polygon(0 0, 100% 0, calc(100% - 10px) 100%, 0 100%);
}

.page-about .bar-fill {
  display: block;
  height: 100%;
  transform-origin: left center;
}

.page-about .bar-fill--a {
  width: 41%;
  background: linear-gradient(90deg, var(--cyan-400), var(--cyan-200));
}

.page-about .bar-fill--b {
  width: 35%;
  background: linear-gradient(90deg, var(--orange-500), var(--orange-200));
}

.page-about .bar-fill--c {
  width: 24%;
  background: linear-gradient(90deg, var(--cyan-200), var(--slate-400));
}

.page-about .bar-row:hover .bar-fill,
.page-about .bar-row:focus-within .bar-fill {
  filter: brightness(1.12);
}

.page-about .bar-note {
  margin: 9px 0 0;
  max-width: 56ch;
  font-size: 14px;
  line-height: 1.65;
  color: var(--slate-400);
}

.page-about .team-prose p {
  font-size: 15px;
}

/* ---- 阅读路径 ---- */
.page-about .routes {
  margin: 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 0;
}

.page-about .route {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 16px;
  padding: clamp(20px, 3vw, 30px) 0;
  border-top: 1px solid var(--ink-700);
}

.page-about .route:last-child {
  border-bottom: 1px solid var(--ink-700);
}

.page-about .route-idx {
  font-family: var(--font-display);
  font-weight: 700;
  font-variant-numeric: tabular-nums;
  font-size: clamp(22px, 3vw, 32px);
  line-height: 1;
  color: var(--ink-700);
}

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

.page-about .route-body h3 {
  margin: 0 0 6px;
  font-family: var(--font-cn);
  font-weight: 600;
  font-size: clamp(17px, 2.2vw, 21px);
  color: var(--chalk);
}

.page-about .route-body p {
  margin: 0 0 12px;
  max-width: 64ch;
  font-size: 15px;
  line-height: 1.75;
  color: var(--mist-100);
}

.page-about .route-link {
  display: inline-block;
  font-size: 14px;
  letter-spacing: 0.02em;
  color: var(--cyan-400);
  text-decoration: none;
  border-bottom: 1px solid rgba(53, 240, 198, 0.4);
  padding-bottom: 2px;
  transition: color 0.2s var(--ease-out), border-color 0.2s var(--ease-out);
}

.page-about .route-link:hover,
.page-about .route-link:focus-visible {
  color: var(--orange-200);
  border-bottom-color: var(--orange-500);
}

/* ---- 合作 ---- */
.page-about .partner-list {
  margin: 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 20px;
  min-width: 0;
}

.page-about .partner-list li {
  padding: 20px 20px 22px;
  background: var(--about-card-bg);
  border-left: 3px solid var(--cyan-400);
  min-width: 0;
}

.page-about .partner-list li:nth-child(2) {
  border-left-color: var(--orange-500);
}

.page-about .partner-list li:nth-child(3) {
  border-left-color: var(--cyan-200);
}

.page-about .partner-list h3 {
  margin: 12px 0 8px;
  font-family: var(--font-cn);
  font-weight: 600;
  font-size: 17px;
  line-height: 1.4;
  color: var(--chalk);
}

.page-about .partner-list p {
  margin: 0;
  font-size: 14px;
  line-height: 1.7;
  color: var(--mist-100);
}

.page-about .partner-panel {
  min-width: 0;
}

.page-about .step-list {
  margin: 0 0 20px;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 14px;
}

.page-about .step-list li {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 12px;
  align-items: start;
  font-size: 14px;
  line-height: 1.7;
  color: var(--mist-100);
}

.page-about .step-num {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 24px;
  height: 24px;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 14px;
  color: var(--ink-950);
  background: var(--cyan-400);
  clip-path: polygon(6px 0, 100% 0, 100% calc(100% - 6px), calc(100% - 6px) 100%, 0 100%, 0 6px);
}

.page-about .panel-note {
  margin: 14px 0 0;
}

/* ---- 响应式 ---- */
@media (min-width: 640px) {
  .page-about .mast-stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

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

@media (min-width: 860px) {
  .page-about .sec-head {
    grid-template-columns: 132px minmax(0, 1fr);
    gap: 26px;
    align-items: end;
  }

  .page-about .big-num {
    font-size: clamp(60px, 7vw, 96px);
  }

  .page-about .split {
    grid-template-columns: minmax(0, 1.12fr) minmax(0, 0.88fr);
    gap: clamp(32px, 5vw, 64px);
  }

  .page-about .split--reverse {
    grid-template-columns: minmax(0, 0.88fr) minmax(0, 1.12fr);
  }

  .page-about .tl-item {
    display: grid;
    grid-template-columns: 176px minmax(0, 1fr);
    gap: 26px;
    padding-left: 40px;
  }

  .page-about .tl-mark {
    display: grid;
    gap: 4px;
    justify-items: start;
    margin-bottom: 0;
  }

  .page-about .route {
    grid-template-columns: 72px minmax(0, 1fr);
    gap: 24px;
    align-items: start;
  }

  .page-about .partner-list {
    grid-template-columns: 1fr;
  }
}

@media (min-width: 1024px) {
  .page-about .data-cards {
    gap: 18px;
  }

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

  .page-about .partner-list li {
    display: flex;
    flex-direction: column;
  }

  .page-about .partner-list h3 {
    margin-top: auto;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .toc-list a,
  .page-about .route-link,
  .page-about .bar-fill {
    transition: none;
  }
}