.page-about {
  --about-rail: 168px;
  --about-gap: clamp(16px, 3vw, 32px);
  display: block;
  color: var(--text);
  background: var(--bg);
}

/* ---------- 页面头部 ---------- */
.page-about .breadcrumb {
  padding-block: 18px 0;
  font-size: 13px;
  letter-spacing: 0.02em;
}

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

.page-about .breadcrumb li + li::before {
  content: "/";
  margin-right: 6px;
  color: var(--muted);
}

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

.page-about .breadcrumb a:hover,
.page-about .breadcrumb a:focus-visible {
  color: var(--cyan);
}

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

.page-about .about-hero {
  padding-block: clamp(20px, 4vw, 40px) clamp(20px, 3.5vw, 32px);
  max-width: 1000px;
}

.page-about .about-hero h1 {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(30px, 6.4vw, 54px);
  line-height: 1.08;
  letter-spacing: -0.02em;
  margin: 10px 0 0;
  color: var(--text);
}

.page-about .about-hero .lede {
  margin: 18px 0 0;
  max-width: 62ch;
  font-size: 16px;
  line-height: 1.75;
  color: var(--text);
}

/* ---------- 顶部条带图 ---------- */
.page-about .about-strip {
  padding-bottom: clamp(24px, 4vw, 44px);
}

.page-about .media-frame {
  max-width: 100%;
  position: relative;
  overflow: hidden;
  border: 2px solid var(--line-strong);
  border-radius: var(--radius);
  background: var(--surface);
  box-shadow: var(--shadow-hard);
}

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

.page-about .media-frame__caption {
  display: block;
  padding: 10px 14px;
  font-size: 12.5px;
  line-height: 1.6;
  color: var(--muted);
  border-top: 2px solid var(--line);
  background: var(--bg);
}

.page-about .media-frame--banner {
  aspect-ratio: 16 / 6;
}

.page-about .media-frame--4x3 {
  aspect-ratio: 4 / 3;
}

/* ---------- 规模数据带 ---------- */
.page-about .about-band {
  position: relative;
  overflow: hidden;
  background: var(--surface);
  border-top: 2px solid var(--line-strong);
  border-bottom: 2px solid var(--line-strong);
}

.page-about .about-band::before {
  content: "";
  position: absolute;
  inset: 0 0 auto 0;
  height: 8px;
  background: repeating-linear-gradient(
    90deg,
    var(--cyan) 0 2px,
    transparent 2px 16px
  );
  opacity: 0.5;
  pointer-events: none;
}

@media (prefers-reduced-motion: no-preference) {
  .page-about .about-band::before {
    animation: about-scan 6s linear infinite;
  }
}

@keyframes about-scan {
  from { transform: translateX(0); }
  to { transform: translateX(16px); }
}

.page-about .about-band__list {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 2px;
  list-style: none;
  margin: 0;
  padding: 12px 0 12px;
  background: transparent;
}

.page-about .about-band__list > li {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: 18px 16px;
  background: var(--bg);
  border: 2px solid var(--line);
  border-radius: var(--radius);
}

.page-about .about-band__num {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: clamp(26px, 5vw, 44px);
  font-weight: 700;
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--cyan);
}

.page-about .about-band__label {
  font-size: 13px;
  letter-spacing: 0.04em;
  color: var(--muted);
}

/* ---------- 通用区块 ---------- */
.page-about .about-section {
  padding-block: clamp(40px, 7vw, 80px);
  border-bottom: 2px solid var(--line);
}

.page-about .about-section__head {
  max-width: 760px;
  margin-bottom: clamp(22px, 3.5vw, 40px);
}

.page-about .about-section__head h2 {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(22px, 3.6vw, 34px);
  line-height: 1.16;
  letter-spacing: -0.01em;
  margin: 10px 0 0;
}

.page-about .about-intro {
  margin: 14px 0 0;
  font-size: 15.5px;
  line-height: 1.75;
  color: var(--muted);
}

.page-about .about-cols {
  display: grid;
  grid-template-columns: 1fr;
  gap: 0 40px;
}

.page-about .about-cols p {
  margin: 0 0 16px;
  max-width: 68ch;
  font-size: 15.5px;
  line-height: 1.8;
}

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

/* ---------- 覆盖范围 ---------- */
.page-about .about-split {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(20px, 3vw, 40px);
  align-items: start;
}

.page-about .about-split__text p {
  margin: 0 0 16px;
  max-width: 62ch;
  font-size: 15.5px;
  line-height: 1.8;
}

.page-about .about-split__text p:last-of-type {
  margin-bottom: 20px;
}

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

.page-about .about-audience {
  display: grid;
  grid-template-columns: 1fr;
  gap: 2px;
  margin-top: clamp(28px, 4vw, 48px);
  background: var(--line);
  border: 2px solid var(--line-strong);
  border-radius: var(--radius);
  overflow: hidden;
}

.page-about .about-audience article {
  background: var(--surface);
  padding: 22px 18px;
  transition: background 0.18s var(--ease);
}

.page-about .about-audience article:hover {
  background: var(--rise);
}

.page-about .about-audience h3 {
  margin: 0 0 8px;
  font-family: var(--font-display);
  font-size: 17px;
  font-weight: 700;
  line-height: 1.4;
  color: var(--cyan);
}

.page-about .about-audience p {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.75;
  color: var(--text);
}

/* ---------- 团队分工 ---------- */
.page-about .team-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 2px;
  background: var(--line);
  border: 2px solid var(--line-strong);
  border-radius: var(--radius);
  overflow: hidden;
}

.page-about .team-cell {
  position: relative;
  background: var(--surface);
  padding: 22px 18px 24px;
  border-left: 4px solid transparent;
  transition: background 0.18s var(--ease), border-color 0.18s var(--ease);
}

.page-about .team-cell:hover {
  background: var(--rise);
  border-left-color: var(--cyan);
}

.page-about .team-cell__no {
  display: inline-block;
  font-size: 12px;
  letter-spacing: 0.12em;
  color: var(--orange);
}

.page-about .team-cell h3 {
  margin: 10px 0 0;
  font-family: var(--font-display);
  font-size: 19px;
  font-weight: 800;
  line-height: 1.3;
}

.page-about .team-cell__count {
  margin: 6px 0 0;
  font-size: 15px;
  font-weight: 700;
  letter-spacing: 0.04em;
  color: var(--yellow);
}

.page-about .team-cell__role {
  margin: 10px 0 0;
  font-size: 14.5px;
  line-height: 1.72;
}

.page-about .team-cell__extra {
  margin: 0;
  font-size: 13.5px;
  line-height: 1.7;
  color: var(--muted);
  max-height: 8em;
  opacity: 1;
  overflow: hidden;
  transition: max-height 0.2s var(--ease), opacity 0.2s var(--ease),
    margin-top 0.2s var(--ease);
  margin-top: 10px;
}

.page-about .team-shot {
  margin-top: clamp(24px, 4vw, 40px);
  box-shadow: none;
}

/* ---------- 年份索引 + 大事记 ---------- */
.page-about .year-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(20px, 3vw, 40px);
}

.page-about .year-rail {
  border: 2px solid var(--line-strong);
  border-radius: var(--radius);
  background: var(--surface);
  padding: 8px;
}

.page-about .year-rail ul {
  display: flex;
  gap: 6px;
  list-style: none;
  margin: 0;
  padding: 0;
  overflow-x: auto;
  scrollbar-width: thin;
}

.page-about .year-rail a {
  display: block;
  padding: 8px 14px;
  font-family: var(--font-mono);
  font-size: 14px;
  letter-spacing: 0.06em;
  color: var(--muted);
  text-decoration: none;
  border-left: 3px solid transparent;
  white-space: nowrap;
  transition: color 0.16s var(--ease), background 0.16s var(--ease),
    border-color 0.16s var(--ease);
}

.page-about .year-rail a:hover,
.page-about .year-rail a:focus-visible {
  color: var(--cyan);
  background: var(--rise);
  border-left-color: var(--cyan);
}

.page-about .year-flow {
  list-style: none;
  margin: 0;
  padding: 0;
  border-bottom: 2px solid var(--line);
}

.page-about .year-item {
  display: grid;
  grid-template-columns: 1fr;
  gap: 6px;
  padding: 22px 0;
  border-top: 2px solid var(--line);
  scroll-margin-top: 96px;
}

.page-about .year-item__num {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: clamp(28px, 5.4vw, 48px);
  font-weight: 700;
  line-height: 1;
  letter-spacing: -0.03em;
  color: var(--cyan);
}

.page-about .year-item:nth-child(4n + 2) .year-item__num {
  color: var(--orange);
}

.page-about .year-item:nth-child(4n + 4) .year-item__num {
  color: var(--yellow);
}

.page-about .year-item__body h3 {
  margin: 0;
  font-family: var(--font-display);
  font-size: clamp(17px, 2.4vw, 22px);
  font-weight: 700;
  line-height: 1.36;
}

.page-about .year-item__body p {
  margin: 8px 0 0;
  max-width: 58ch;
  font-size: 14.5px;
  line-height: 1.75;
  color: var(--muted);
}

/* ---------- 共享赛历 ---------- */
.page-about .about-metrics {
  display: grid;
  grid-template-columns: 1fr;
  gap: 2px;
  margin: clamp(24px, 3.5vw, 40px) 0 0;
  padding: 0;
  list-style: none;
  background: var(--line);
  border: 2px solid var(--line-strong);
  border-radius: var(--radius);
  overflow: hidden;
}

.page-about .about-metrics li {
  background: var(--surface);
  padding: 18px 18px;
  font-size: 14.5px;
  line-height: 1.7;
  color: var(--text);
}

.page-about .about-metrics .mono {
  display: inline-block;
  min-width: 2.4em;
  margin-right: 10px;
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: 22px;
  font-weight: 700;
  color: var(--cyan);
  vertical-align: -2px;
}

/* ---------- 下一步入口 ---------- */
.page-about .about-section--next {
  border-bottom: 0;
}

.page-about .about-links {
  display: grid;
  grid-template-columns: 1fr;
  gap: 2px;
  margin: 0;
  padding: 0;
  list-style: none;
  background: var(--line);
  border: 2px solid var(--line-strong);
  border-radius: var(--radius);
  overflow: hidden;
}

.page-about .about-links a {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  align-items: baseline;
  gap: 4px 14px;
  padding: 20px 18px;
  background: var(--surface);
  text-decoration: none;
  color: var(--text);
  transition: background 0.18s var(--ease);
}

.page-about .about-links a:hover,
.page-about .about-links a:focus-visible {
  background: var(--rise);
}

.page-about .about-links__no {
  grid-row: span 2;
  font-size: 13px;
  letter-spacing: 0.1em;
  color: var(--orange);
}

.page-about .about-links__title {
  font-family: var(--font-display);
  font-size: 18px;
  font-weight: 800;
  line-height: 1.3;
  color: var(--cyan);
}

.page-about .about-links__desc {
  grid-column: 2;
  font-size: 14px;
  line-height: 1.7;
  color: var(--muted);
}

/* ---------- 响应式 ---------- */
@media (min-width: 640px) {
  .page-about .about-cols {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

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

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

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

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

@media (min-width: 900px) {
  .page-about .about-split {
    grid-template-columns: minmax(0, 1.15fr) minmax(0, 0.85fr);
  }

  .page-about .year-grid {
    grid-template-columns: var(--about-rail) minmax(0, 1fr);
    align-items: start;
  }

  .page-about .year-rail {
    position: sticky;
    top: 88px;
  }

  .page-about .year-rail ul {
    flex-direction: column;
    gap: 2px;
    overflow: visible;
  }

  .page-about .year-item {
    grid-template-columns: 108px minmax(0, 1fr);
    gap: 24px;
    padding: 26px 0;
  }

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

@media (min-width: 900px) {
  /* 桌面端：职责细节默认收起，悬停或聚焦时展开 */
  .page-about .team-cell__extra {
    max-height: 0;
    opacity: 0;
    margin-top: 0;
  }

  .page-about .team-cell:hover .team-cell__extra,
  .page-about .team-cell:focus-within .team-cell__extra {
    max-height: 9em;
    opacity: 1;
    margin-top: 10px;
  }
}

@media (min-width: 1024px) {
  .page-about .about-band__list {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}
<<<END>>>