.page-about {
  --about-measure: 720px;
  --about-index: 240px;
  --about-gap: 64px;
}

.page-about .about-canvas {
  background: var(--cream);
  color: var(--ink);
  padding: 28px 0 88px;
  overflow-x: clip;
}

/* ---------- 面包屑 ---------- */
.page-about .breadcrumb {
  margin-bottom: 44px;
}

.page-about .breadcrumb-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  font-size: 12.5px;
  color: var(--grid);
}

.page-about .breadcrumb-item + .breadcrumb-item::before {
  content: "/";
  margin-right: 6px;
  color: var(--grid);
  opacity: 0.7;
}

.page-about .breadcrumb-item a {
  color: var(--grid);
  text-decoration: none;
}

.page-about .breadcrumb-item a:hover,
.page-about .breadcrumb-item a:focus-visible {
  color: var(--brick);
  text-decoration: underline;
  text-underline-offset: 3px;
}

.page-about .breadcrumb-item[aria-current="page"] {
  color: var(--ink);
}

/* ---------- 首屏 ---------- */
.page-about .about-masthead {
  max-width: 900px;
  padding-bottom: 44px;
  border-bottom: 1px solid var(--line-light);
}

.page-about .about-kicker {
  font-size: 11.5px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--brick);
  margin: 0 0 18px;
}

.page-about .about-title {
  font-size: clamp(30px, 5.2vw, 58px);
  line-height: 1.14;
  letter-spacing: -0.012em;
  color: var(--ink);
  margin: 0 0 24px;
  max-width: 15em;
}

.page-about .about-lede {
  font-size: 16.5px;
  line-height: 1.85;
  color: var(--ink);
  max-width: var(--about-measure);
  margin: 0 0 40px;
}

.page-about .about-stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 22px 18px;
  margin: 0;
  max-width: 900px;
}

.page-about .about-stat {
  border-top: 2px solid var(--brick);
  padding-top: 14px;
  min-width: 0;
}

.page-about .stat-label {
  font-size: 12px;
  letter-spacing: 0.04em;
  color: var(--grid);
  margin-bottom: 8px;
}

.page-about .stat-value {
  font-size: 32px;
  line-height: 1;
  font-weight: 600;
  color: var(--ink);
  letter-spacing: 0.01em;
  margin: 0;
}

.page-about .stat-unit {
  font-family: var(--font-body);
  font-size: 12.5px;
  font-weight: 400;
  color: var(--grid);
  margin-left: 6px;
  letter-spacing: 0;
}

/* ---------- 布局 ---------- */
.page-about .about-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 40px;
  margin-top: 56px;
}

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

/* ---------- 右侧索引 ---------- */
.page-about .about-index {
  order: 2;
}

.page-about .index-title {
  font-size: 11px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--grid);
  margin: 0 0 12px;
  padding-bottom: 10px;
  border-bottom: 1px solid var(--line-light);
}

.page-about .index-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 2px;
}

.page-about .index-list a {
  display: flex;
  align-items: baseline;
  gap: 10px;
  padding: 8px 10px;
  font-size: 13.5px;
  line-height: 1.4;
  color: var(--ink);
  text-decoration: none;
  border-left: 2px solid transparent;
  border-radius: 0 6px 6px 0;
  transition: color var(--ease), border-color var(--ease), background var(--ease);
}

.page-about .index-list .mono {
  font-size: 11px;
  color: var(--grid);
  transition: color var(--ease);
}

.page-about .index-list a:hover,
.page-about .index-list a:focus-visible {
  color: var(--brick);
  border-left-color: var(--brick);
  background: rgba(180, 71, 44, 0.07);
  outline: none;
}

.page-about .index-list a:hover .mono,
.page-about .index-list a:focus-visible .mono {
  color: var(--brick);
}

/* ---------- 章节 ---------- */
.page-about .about-chapter {
  padding-top: 40px;
  margin-bottom: 52px;
}

.page-about .about-chapter + .about-chapter {
  border-top: 1px solid var(--line-light);
}

.page-about .chapter-head {
  display: flex;
  align-items: baseline;
  gap: 14px;
  margin-bottom: 22px;
}

.page-about .chapter-num {
  flex: none;
  font-size: 12px;
  letter-spacing: 0.12em;
  color: var(--brick);
}

.page-about .chapter-title {
  font-size: clamp(22px, 3.2vw, 30px);
  line-height: 1.3;
  color: var(--ink);
  margin: 0;
  letter-spacing: -0.01em;
}

.page-about .about-prose {
  max-width: var(--about-measure);
}

.page-about .about-prose p {
  font-size: 16px;
  line-height: 1.85;
  color: var(--ink);
  margin: 0 0 1.2em;
}

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

.page-about .about-prose strong {
  font-weight: 700;
  color: var(--brick);
}

/* ---------- 时间轴 ---------- */
.page-about .season-timeline {
  list-style: none;
  margin: 30px 0 40px;
  padding: 0 0 0 26px;
  border-left: 1px solid var(--line-light);
  display: grid;
  gap: 28px;
}

.page-about .season-item {
  position: relative;
  min-width: 0;
}

.page-about .season-dot {
  position: absolute;
  left: -31px;
  top: 6px;
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--brick);
  box-shadow: 0 0 0 4px var(--cream);
}

.page-about .season-phase {
  font-size: 11px;
  letter-spacing: 0.16em;
  color: var(--brick);
  margin: 0 0 6px;
}

.page-about .season-name {
  font-size: 19px;
  line-height: 1.4;
  color: var(--ink);
  margin: 0 0 8px;
}

.page-about .season-note {
  font-size: 15px;
  line-height: 1.8;
  color: var(--ink);
  margin: 0;
  max-width: 62ch;
}

/* ---------- 图片 ---------- */
.page-about .about-figure {
  margin: 0;
  min-width: 0;
}

.page-about .about-figure img {
  display: block;
  width: 100%;
  height: auto;
  border-radius: 12px;
  object-fit: cover;
  background: var(--cream-2);
}

.page-about .about-figure .media-caption {
  margin-top: 10px;
  font-size: 11.5px;
  line-height: 1.6;
  color: var(--grid);
}

.page-about .season-timeline + .about-figure {
  margin-top: 8px;
}

/* ---------- 赛区 ---------- */
.page-about .region-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 18px;
  margin-top: 30px;
}

.page-about .region-card {
  padding: 26px 22px 24px;
  border: 1px solid var(--line-light);
  background: var(--cream-2);
  min-width: 0;
  transition: border-color var(--ease), transform var(--ease), box-shadow var(--ease);
}

.page-about .region-card:hover {
  transform: translateY(-2px);
  border-color: var(--brick);
  box-shadow: 0 18px 34px -26px rgba(36, 28, 23, 0.7);
}

.page-about .region-card--eu {
  border-radius: 34px 10px 30px 10px;
}

.page-about .region-card--as {
  border-radius: 10px 34px 10px 30px;
  background: rgba(79, 227, 208, 0.16);
}

.page-about .region-card--am {
  border-radius: 28px 10px 36px 10px;
  background: rgba(255, 106, 61, 0.13);
}

.page-about .region-tag {
  font-size: 10.5px;
  letter-spacing: 0.18em;
  color: var(--grid);
  margin: 0 0 10px;
}

.page-about .region-name {
  font-size: 24px;
  line-height: 1.25;
  color: var(--ink);
  margin: 0 0 10px;
}

.page-about .region-desc {
  font-size: 14.5px;
  line-height: 1.8;
  color: var(--ink);
  margin: 0 0 16px;
}

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

.page-about .region-list li {
  font-size: 12px;
  line-height: 1.4;
  padding: 4px 10px;
  border: 1px solid var(--line-light);
  border-radius: 999px;
  color: var(--grid);
}

/* ---------- 图文并排 ---------- */
.page-about .about-split-body {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 26px;
  align-items: start;
}

.page-about .about-split-body .about-prose p {
  max-width: 62ch;
}

/* ---------- 深色能力面板 ---------- */
.page-about .about-chapter--dark {
  background: var(--navy);
  border-radius: 18px;
  padding: 34px 22px 30px;
  border-top: none;
  margin-top: 12px;
}

.page-about .about-chapter--dark .chapter-num {
  color: var(--cyan);
}

.page-about .about-chapter--dark .chapter-title {
  color: var(--cream);
}

.page-about .about-chapter--dark .about-prose p {
  color: rgba(244, 237, 225, 0.84);
}

.page-about .cap-list {
  list-style: none;
  margin: 26px 0 0;
  padding: 0;
  display: grid;
}

.page-about .cap-item {
  display: grid;
  grid-template-columns: 74px minmax(0, 1fr);
  gap: 16px;
  align-items: baseline;
  padding: 15px 0;
  border-top: 1px solid rgba(124, 141, 166, 0.22);
}

.page-about .cap-item:last-child {
  border-bottom: 1px solid rgba(124, 141, 166, 0.22);
}

.page-about .cap-num {
  font-size: 26px;
  line-height: 1.1;
  font-weight: 600;
  color: var(--cyan);
  letter-spacing: 0.02em;
}

.page-about .cap-text {
  font-size: 14.5px;
  line-height: 1.75;
  color: rgba(244, 237, 225, 0.86);
  margin: 0;
}

/* ---------- 规模数据 ---------- */
.page-about .scale-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 24px;
  margin-top: 30px;
}

.page-about .scale-item {
  border-top: 2px solid var(--ink);
  padding-top: 16px;
  min-width: 0;
}

.page-about .scale-num {
  display: block;
  font-size: clamp(34px, 5vw, 52px);
  line-height: 1;
  font-weight: 600;
  color: var(--brick);
  letter-spacing: 0.01em;
  margin-bottom: 12px;
}

.page-about .scale-unit {
  font-family: var(--font-body);
  font-size: 14px;
  font-weight: 400;
  color: var(--grid);
  margin-left: 5px;
  letter-spacing: 0;
}

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

/* ---------- 收束区 ---------- */
.page-about .about-outro {
  margin-top: 8px;
  padding-top: 36px;
  border-top: 1px solid var(--line-light);
}

.page-about .outro-title {
  font-size: 22px;
  line-height: 1.35;
  color: var(--ink);
  margin: 0 0 20px;
}

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

.page-about .outro-list li {
  display: grid;
  gap: 6px;
  padding: 16px 18px;
  border: 1px solid var(--line-light);
  border-radius: 10px;
  background: rgba(233, 223, 206, 0.45);
  transition: border-color var(--ease), transform var(--ease), box-shadow var(--ease);
}

.page-about .outro-list li:hover,
.page-about .outro-list li:focus-within {
  border-color: var(--brick);
  transform: translateY(-2px);
  box-shadow: 0 16px 30px -24px rgba(36, 28, 23, 0.75);
}

.page-about .outro-list a {
  font-size: 16px;
  font-weight: 700;
  color: var(--ink);
  text-decoration: none;
  transition: color var(--ease);
}

.page-about .outro-list a:hover,
.page-about .outro-list a:focus-visible {
  color: var(--brick);
}

.page-about .outro-list span {
  font-size: 14px;
  line-height: 1.7;
  color: var(--grid);
}

/* ---------- 渐进增强兜底与焦点 ---------- */
.page-about a:focus-visible,
.page-about .btn:focus-visible {
  outline: 2px solid var(--brick);
  outline-offset: 2px;
}

/* ---------- 响应式 ---------- */
@media (min-width: 640px) {
  .page-about .about-stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
  .page-about .outro-list {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
  .page-about .about-chapter--dark {
    padding: 38px 30px 34px;
  }
}

@media (min-width: 760px) {
  .page-about .region-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
  .page-about .scale-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

@media (min-width: 900px) {
  .page-about .about-split-body {
    grid-template-columns: minmax(0, 0.86fr) minmax(0, 1fr);
    gap: 40px;
  }
  .page-about .about-split--reverse .about-split-body {
    grid-template-columns: minmax(0, 1fr) minmax(0, 0.86fr);
  }
}

@media (min-width: 1080px) {
  .page-about .about-canvas {
    padding: 40px 0 120px;
  }
  .page-about .about-layout {
    grid-template-columns: minmax(0, 1fr) var(--about-index);
    gap: var(--about-gap);
    align-items: start;
  }
  .page-about .about-index {
    order: 0;
    position: sticky;
    top: 72px;
    align-self: start;
  }
  .page-about .about-chapter {
    padding-top: 48px;
    margin-bottom: 64px;
  }
}

@media (min-width: 1280px) {
  .page-about .about-title {
    font-size: 60px;
  }
}

@media (max-width: 420px) {
  .page-about .cap-item {
    grid-template-columns: minmax(0, 1fr);
    gap: 6px;
  }
  .page-about .cap-num {
    font-size: 22px;
  }
  .page-about .season-timeline {
    padding-left: 20px;
  }
  .page-about .season-dot {
    left: -25px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .region-card,
  .page-about .outro-list li,
  .page-about .index-list a {
    transition: none;
  }
  .page-about .region-card:hover,
  .page-about .outro-list li:hover,
  .page-about .outro-list li:focus-within {
    transform: none;
  }
}