.page-about {
  display: block;
  padding-bottom: 88px;
  background: var(--warm-white);
  color: var(--ink-900);
  font-family: var(--font-sans);
}

.page-about .breadcrumb {
  padding-top: 20px;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  padding: 20px 0 8px;
}

.page-about .about-hero__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 28px;
  align-items: end;
}

.page-about .about-hero__eyebrow {
  margin: 0 0 6px;
  color: var(--amber-700);
}

.page-about .about-hero__year {
  margin: 0 0 -6px;
  font-family: var(--font-mono);
  font-weight: 500;
  font-size: clamp(72px, 20vw, 148px);
  line-height: 0.82;
  letter-spacing: -0.05em;
  color: var(--ink-900);
  opacity: 0.14;
  user-select: none;
}

.page-about .about-hero__title {
  margin: 0 0 16px;
  font-size: clamp(28px, 6.4vw, 52px);
  font-weight: 800;
  line-height: 1.18;
  letter-spacing: -0.015em;
  color: var(--ink-900);
}

.page-about .about-hero__lede {
  margin: 0 0 22px;
  max-width: 40em;
  font-size: 16px;
  line-height: 1.8;
  color: var(--ink-700);
}

.page-about .about-hero__facts {
  display: flex;
  flex-wrap: wrap;
  gap: 0;
  margin: 0 0 20px;
  padding: 0;
  list-style: none;
  border-top: 1px solid var(--line-300);
  border-bottom: 1px solid var(--line-300);
}

.page-about .about-hero__fact {
  flex: 1 1 33%;
  min-width: 96px;
  padding: 14px 12px 14px 0;
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.page-about .about-hero__fact + .about-hero__fact {
  padding-left: 14px;
  border-left: 1px solid var(--line-300);
}

.page-about .about-hero__fact-value {
  font-family: var(--font-mono);
  font-weight: 500;
  font-size: 19px;
  letter-spacing: -0.01em;
  color: var(--ink-900);
}

.page-about .about-hero__fact-label {
  color: var(--graphite-600);
}

.page-about .about-hero__status {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  margin: 0;
  padding: 6px 12px;
  border: 1px solid var(--line-300);
  background: var(--paper-200);
  font-size: 13px;
  color: var(--ink-700);
}

.page-about .about-hero__status .label {
  color: var(--graphite-600);
}

.page-about .about-hero__status time {
  font-family: var(--font-mono);
}

.page-about .about-hero__media {
  margin: 0;
}

.page-about .about-hero__frame {
  position: relative;
  overflow: hidden;
  border: 1px solid var(--line-300);
  background: var(--paper-200);
  box-shadow: var(--shadow-soft);
}

.page-about .about-hero__frame::after {
  content: attr(data-label);
  position: absolute;
  left: 0;
  bottom: 0;
  padding: 5px 12px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  color: var(--warm-white);
  background: var(--ink-900);
}

.page-about .about-hero__frame img {
  display: block;
  width: 100%;
  height: auto;
  max-width: 100%;
  aspect-ratio: 4 / 5;
  object-fit: cover;
}

.page-about .about-hero__caption {
  margin-top: 10px;
  font-size: 13px;
  line-height: 1.7;
  color: var(--graphite-600);
}

/* ---------- 主体布局 ---------- */
.page-about .about-main {
  padding-top: 40px;
}

.page-about .about-layout {
  display: block;
}

.page-about .about-toc {
  display: none;
}

.page-about .about-toc__title {
  margin: 0 0 12px;
  color: var(--graphite-600);
}

.page-about .about-toc__list {
  margin: 0;
  padding: 0;
  list-style: none;
  border-top: 1px solid var(--line-300);
}

.page-about .about-toc__item {
  border-bottom: 1px solid var(--line-300);
}

.page-about .about-toc__link {
  display: flex;
  align-items: baseline;
  gap: 10px;
  padding: 10px 4px;
  font-size: 14px;
  line-height: 1.5;
  color: var(--ink-700);
  text-decoration: none;
  transition: color 0.2s var(--ease), padding-left 0.2s var(--ease);
}

.page-about .about-toc__link:hover,
.page-about .about-toc__link:focus-visible {
  color: var(--amber-700);
  padding-left: 10px;
}

.page-about .about-toc__index {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.12em;
  color: var(--graphite-600);
}

/* ---------- 面板 ---------- */
.page-about .about-body {
  min-width: 0;
}

.page-about .about-panel {
  background: var(--warm-white);
  border: 1px solid var(--line-300);
  box-shadow: var(--shadow-soft);
  padding: 22px 18px 26px;
  margin-bottom: var(--seam);
  transition: border-color 0.25s var(--ease), box-shadow 0.25s var(--ease);
}

.page-about .about-panel:hover {
  border-color: var(--amber-500);
  box-shadow: var(--shadow-lift);
}

.page-about .about-panel__head {
  display: flex;
  align-items: baseline;
  gap: 14px;
  padding-bottom: 12px;
  margin-bottom: 18px;
  border-bottom: 1px solid var(--line-300);
}

.page-about .about-panel__index {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.16em;
  color: var(--amber-700);
  flex: none;
}

.page-about .about-panel__title {
  margin: 0;
  font-size: clamp(20px, 4.6vw, 30px);
  font-weight: 800;
  line-height: 1.25;
  letter-spacing: -0.01em;
  color: var(--ink-900);
}

.page-about .about-panel__lead {
  margin: 0 0 20px;
  max-width: 42em;
  font-size: 16px;
  line-height: 1.8;
  color: var(--ink-700);
}

.page-about .about-panel__body .prose p {
  margin: 0 0 16px;
  max-width: 42em;
  font-size: 16px;
  line-height: 1.8;
  color: var(--ink-700);
}

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

.page-about .about-panel__foot {
  margin-top: 20px;
  padding-top: 14px;
  border-top: 1px solid var(--line-300);
  font-size: 14px;
  line-height: 1.8;
  color: var(--graphite-600);
}

.page-about .about-panel__more {
  margin: 22px 0 0;
  font-size: 15px;
  line-height: 1.8;
  color: var(--ink-700);
}

.page-about .prose a,
.page-about .about-panel__foot a,
.page-about .about-panel__more a {
  color: var(--amber-700);
  text-decoration: none;
  border-bottom: 1px solid var(--amber-500);
}

.page-about .prose a:hover,
.page-about .about-panel__foot a:hover,
.page-about .about-panel__more a:hover {
  color: var(--ink-900);
}

/* 深色面板 */
.page-about .about-panel--ink {
  background: var(--ink-900);
  border-color: var(--ink-700);
  color: var(--warm-white);
}

.page-about .about-panel--ink .about-panel__head {
  border-bottom-color: rgba(250, 247, 241, 0.18);
}

.page-about .about-panel--ink .about-panel__index {
  color: var(--amber-500);
}

.page-about .about-panel--ink .about-panel__title {
  color: var(--warm-white);
}

.page-about .about-panel--ink .about-panel__lead {
  color: rgba(250, 247, 241, 0.82);
}

.page-about .about-panel--ink:hover {
  border-color: var(--amber-500);
}

/* ---------- 时间轴 ---------- */
.page-about .tl {
  display: grid;
  grid-template-columns: 1fr;
  gap: 10px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .tl-node {
  position: relative;
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: 16px 14px 18px;
  background: var(--paper-200);
  border: 1px solid var(--line-300);
  border-top-width: 3px;
  border-top-color: var(--line-300);
  transition: transform 0.22s var(--ease), background 0.22s var(--ease), border-color 0.22s var(--ease);
}

.page-about .tl-node:hover,
.page-about .tl-node:focus-within {
  transform: translateY(-2px);
  background: var(--warm-white);
}

.page-about .tl-node--spring { border-top-color: var(--spring-500); }
.page-about .tl-node--summer { border-top-color: var(--summer-500); }
.page-about .tl-node--autumn { border-top-color: var(--autumn-500); }
.page-about .tl-node--winter { border-top-color: var(--winter-500); }
.page-about .tl-node--now { border-top-color: var(--amber-500); box-shadow: var(--shadow-lift); }

.page-about .tl-node__dot {
  position: absolute;
  top: -8px;
  right: 14px;
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--line-300);
}

.page-about .tl-node--spring .tl-node__dot { background: var(--spring-500); }
.page-about .tl-node--summer .tl-node__dot { background: var(--summer-500); }
.page-about .tl-node--autumn .tl-node__dot { background: var(--autumn-500); }
.page-about .tl-node--winter .tl-node__dot { background: var(--winter-500); }
.page-about .tl-node--now .tl-node__dot {
  background: var(--amber-500);
  box-shadow: 0 0 0 3px rgba(217, 130, 43, 0.22);
}

.page-about .tl-node__year {
  margin: 0;
  font-family: var(--font-mono);
  font-weight: 500;
  font-size: 22px;
  letter-spacing: -0.01em;
  color: var(--ink-900);
}

.page-about .tl-node--now .tl-node__year {
  color: var(--amber-700);
}

.page-about .tl-node__title {
  margin: 0;
  font-size: 15px;
  font-weight: 800;
  letter-spacing: 0.01em;
  color: var(--ink-900);
}

.page-about .tl-node__desc {
  margin: 4px 0 0;
  font-size: 13.5px;
  line-height: 1.75;
  color: var(--ink-700);
}

/* ---------- 班次 ---------- */
.page-about .shift {
  margin: 0 0 28px;
}

.page-about .shift__bar {
  display: flex;
  gap: 4px;
  height: 22px;
}

.page-about .shift__seg {
  flex: 1 1 0;
  border-radius: 1px;
}

.page-about .shift__seg--a { background: var(--spring-500); }
.page-about .shift__seg--b { background: var(--summer-500); }
.page-about .shift__seg--c { background: var(--autumn-500); }
.page-about .shift__seg--d { background: var(--winter-500); }

.page-about .shift__axis {
  display: flex;
  justify-content: space-between;
  margin-top: 8px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.06em;
  color: rgba(250, 247, 241, 0.55);
}

.page-about .shift__list {
  margin: 22px 0 0;
  padding: 0;
  list-style: none;
  display: grid;
  grid-template-columns: 1fr;
  gap: 12px;
}

.page-about .shift__item {
  padding: 12px 14px;
  border-left: 3px solid var(--line-300);
  background: rgba(250, 247, 241, 0.06);
  transition: background 0.2s var(--ease), border-color 0.2s var(--ease);
}

.page-about .shift__item:hover {
  background: rgba(250, 247, 241, 0.12);
}

.page-about .shift__item--a { border-left-color: var(--spring-500); }
.page-about .shift__item--b { border-left-color: var(--summer-500); }
.page-about .shift__item--c { border-left-color: var(--autumn-500); }
.page-about .shift__item--d { border-left-color: var(--winter-500); }

.page-about .shift__item-head {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 12px;
  margin: 0 0 6px;
}

.page-about .shift__name {
  font-size: 15px;
  font-weight: 800;
  color: var(--warm-white);
}

.page-about .shift__time {
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--amber-500);
}

.page-about .shift__desc {
  margin: 0;
  font-size: 13.5px;
  line-height: 1.75;
  color: rgba(250, 247, 241, 0.78);
}

/* ---------- 配图 ---------- */
.page-about .about-figure {
  margin: 26px 0 0;
}

.page-about .about-figure img {
  display: block;
  width: 100%;
  height: auto;
  max-width: 100%;
  border: 1px solid var(--line-300);
  object-fit: cover;
}

.page-about .about-figure__caption {
  margin-top: 10px;
  font-size: 13px;
  line-height: 1.7;
  color: var(--graphite-600);
}

.page-about .about-panel--ink .about-figure img {
  border-color: var(--ink-700);
}

.page-about .about-panel--ink .about-figure__caption {
  color: rgba(250, 247, 241, 0.6);
}

/* ---------- 数字块 ---------- */
.page-about .stat-row {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin: 0 0 26px;
  background: var(--line-300);
  border: 1px solid var(--line-300);
}

.page-about .stat-block {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: 18px 14px;
  background: var(--paper-200);
  min-width: 0;
}

.page-about .stat-block--amber {
  background: var(--warm-white);
}

.page-about .stat-block__value {
  font-family: var(--font-mono);
  font-weight: 500;
  font-size: clamp(26px, 6vw, 40px);
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--ink-900);
}

.page-about .stat-block--amber .stat-block__value {
  color: var(--amber-700);
}

.page-about .stat-block__label {
  font-size: 12.5px;
  line-height: 1.5;
  color: var(--graphite-600);
}

/* ---------- 运动门类 ---------- */
.page-about .cat-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin: 0 0 22px;
  padding: 0;
  list-style: none;
  background: var(--line-300);
  border: 1px solid var(--line-300);
}

.page-about .cat-item {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 12px 14px;
  background: var(--warm-white);
  font-size: 15px;
  color: var(--ink-900);
  transition: background 0.2s var(--ease), color 0.2s var(--ease);
}

.page-about .cat-item:hover {
  background: rgba(217, 130, 43, 0.1);
  color: var(--amber-700);
}

.page-about .cat-item__index {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.12em;
  color: var(--graphite-600);
}

/* ---------- 要点列表 ---------- */
.page-about .bullet-list {
  margin: 0;
  padding: 0;
  list-style: none;
  display: grid;
  grid-template-columns: 1fr;
  gap: 1px;
  background: var(--line-300);
  border: 1px solid var(--line-300);
}

.page-about .bullet-item {
  background: var(--paper-200);
  padding: 16px 16px 18px;
}

.page-about .bullet-item__key {
  display: block;
  margin-bottom: 6px;
  color: var(--amber-700);
}

.page-about .bullet-item__text {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.8;
  color: var(--ink-700);
}

/* ---------- 合作点阵 ---------- */
.page-about .partner-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--seam);
  margin: 0 0 22px;
}

.page-about .partner-cell {
  padding: 20px 16px;
  border: 1px solid var(--line-300);
  background: var(--paper-200);
}

.page-about .partner-cell--academic {
  background: var(--warm-white);
}

.page-about .partner-cell__value {
  margin: 0;
  font-family: var(--font-mono);
  font-weight: 500;
  font-size: 44px;
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--ink-900);
}

.page-about .partner-cell--academic .partner-cell__value {
  color: var(--amber-700);
}

.page-about .partner-cell__label {
  margin: 8px 0 16px;
  font-size: 13.5px;
  color: var(--graphite-600);
}

.page-about .dots {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .dot {
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--spring-500);
}

.page-about .dots--academic .dot {
  background: var(--winter-500);
}

/* ---------- 记录卡 ---------- */
.page-about .record-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--seam);
}

.page-about .record {
  padding: 18px 16px 20px;
  border: 1px solid var(--line-300);
  border-left: 3px solid var(--amber-500);
  background: var(--paper-200);
}

.page-about .record__value {
  margin: 0 0 8px;
  font-family: var(--font-mono);
  font-weight: 500;
  font-size: 28px;
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--ink-900);
}

.page-about .record__title {
  margin: 0 0 8px;
  font-size: 15px;
  font-weight: 800;
  color: var(--ink-900);
}

.page-about .record__text {
  margin: 0;
  font-size: 14px;
  line-height: 1.8;
  color: var(--ink-700);
}

/* ---------- 四季色带 ---------- */
.page-about .season-strip {
  display: flex;
  gap: 4px;
  height: 14px;
  margin-bottom: 18px;
}

.page-about .season-strip__seg {
  flex: 1 1 0;
}

.page-about .season-strip__seg--spring { background: var(--spring-500); }
.page-about .season-strip__seg--summer { background: var(--summer-500); }
.page-about .season-strip__seg--autumn { background: var(--autumn-500); }
.page-about .season-strip__seg--winter { background: var(--winter-500); }

.page-about .season-legend {
  margin: 0 0 26px;
  padding: 0;
  list-style: none;
  display: grid;
  grid-template-columns: 1fr;
  gap: 10px;
}

.page-about .season-legend__item {
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 14px;
  line-height: 1.7;
  color: var(--ink-700);
}

/* ---------- 收尾行动区 ---------- */
.page-about .about-cta {
  margin-top: var(--seam);
  padding: 26px 18px 30px;
  background: var(--ink-700);
  color: var(--warm-white);
  border: 1px solid var(--ink-900);
}

.page-about .about-cta__eyebrow {
  margin: 0 0 10px;
  color: var(--amber-500);
}

.page-about .about-cta__title {
  margin: 0 0 14px;
  font-size: clamp(20px, 4.8vw, 30px);
  font-weight: 800;
  line-height: 1.3;
  letter-spacing: -0.01em;
  color: var(--warm-white);
}

.page-about .about-cta__text {
  margin: 0 0 22px;
  max-width: 42em;
  font-size: 15px;
  line-height: 1.8;
  color: rgba(250, 247, 241, 0.8);
}

.page-about .about-cta__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

/* ---------- 响应式 ---------- */
@media (min-width: 640px) {
  .page-about .about-panel {
    padding: 28px 26px 32px;
  }

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

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

  .page-about .tl {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 12px;
  }

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

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

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

@media (min-width: 900px) {
  .page-about .about-hero {
    padding: 32px 0 16px;
  }

  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    gap: 48px;
    align-items: end;
  }

  .page-about .about-hero__frame img {
    aspect-ratio: 4 / 5;
  }

  .page-about .about-hero__title {
    max-width: 22em;
  }

  .page-about .about-cta {
    padding: 36px 40px 40px;
  }

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

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

  .page-about .cat-grid {
    grid-template-columns: repeat(5, minmax(0, 1fr));
  }

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

@media (min-width: 1100px) {
  .page-about {
    padding-bottom: 120px;
  }

  .page-about .about-layout {
    display: grid;
    grid-template-columns: minmax(0, 3fr) minmax(0, 9fr);
    gap: 40px;
    align-items: start;
  }

  .page-about .about-toc {
    display: block;
    position: sticky;
    top: 92px;
  }

  .page-about .about-panel {
    padding: 34px 40px 40px;
  }

  .page-about .tl {
    grid-template-columns: repeat(5, minmax(0, 1fr));
  }

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

  .page-about .record-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 20px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-panel,
  .page-about .tl-node,
  .page-about .cat-item,
  .page-about .about-toc__link,
  .page-about .shift__item {
    transition: none;
  }
}