.page-about {
  --about-gap: clamp(40px, 7vw, 80px);
}

/* 顶部标题区 */
.page-about .hero-shell {
  padding-top: clamp(18px, 3vw, 28px);
}

.page-about .about-hero {
  padding-top: clamp(16px, 3vw, 28px);
  padding-bottom: clamp(26px, 4vw, 46px);
}

.page-about .about-hero h1 {
  margin: 10px 0 18px;
  font-size: clamp(30px, 5.6vw, 60px);
  line-height: 1.08;
  font-weight: 900;
  letter-spacing: -0.02em;
  max-width: 20ch;
}

.page-about .about-hero .lead {
  margin: 0;
  max-width: 64ch;
  color: var(--muted);
  font-size: clamp(15px, 1.6vw, 18px);
  line-height: 1.85;
}

/* 关键数字条 */
.page-about .about-stats {
  list-style: none;
  margin: clamp(26px, 4vw, 42px) 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
  border-radius: var(--r-m);
  overflow: hidden;
}

.page-about .about-stat {
  background: var(--ink-900);
  padding: 18px 16px 20px;
  display: flex;
  flex-direction: column;
  gap: 6px;
  min-width: 0;
}

.page-about .about-stat .stat-num {
  font-size: clamp(28px, 5vw, 40px);
  font-weight: 900;
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--live);
}

.page-about .stat-unit {
  font-size: 12px;
  letter-spacing: 0.18em;
  color: var(--live);
  opacity: 0.75;
}

.page-about .stat-label {
  font-size: 13px;
  line-height: 1.55;
  color: var(--muted);
}

@media (min-width: 760px) {
  .page-about .about-stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

/* 左索引 + 右长文的编辑部分栏 */
.page-about .about-layout {
  display: grid;
  gap: clamp(26px, 4vw, 44px);
  padding-bottom: clamp(44px, 7vw, 88px);
}

@media (min-width: 1000px) {
  .page-about .about-layout {
    grid-template-columns: 200px minmax(0, 1fr);
    gap: clamp(32px, 5vw, 68px);
  }
}

.page-about .about-index {
  border-top: 1px solid var(--line);
  padding-top: 14px;
  min-width: 0;
}

.page-about .index-label {
  margin: 0;
  font-size: 11px;
  letter-spacing: 0.28em;
  color: var(--muted);
  text-transform: uppercase;
}

.page-about .about-toc {
  list-style: none;
  margin: 12px 0 0;
  padding: 0 0 4px;
  display: flex;
  gap: 8px;
  overflow-x: auto;
  scrollbar-width: none;
}

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

.page-about .toc-link {
  display: inline-flex;
  align-items: baseline;
  gap: 7px;
  padding: 8px 13px;
  border: 1px solid var(--line);
  border-radius: 999px;
  color: var(--muted);
  text-decoration: none;
  white-space: nowrap;
  font-size: 13px;
  transition: color 0.22s var(--ease), background 0.22s var(--ease),
    border-color 0.22s var(--ease);
}

.page-about .toc-link:hover,
.page-about .toc-link:focus-visible {
  color: var(--ink-950);
  background: var(--live);
  border-color: var(--live);
}

.page-about .toc-meta {
  font-size: 11px;
  letter-spacing: 0.1em;
  color: var(--sub);
}

.page-about .toc-link:hover .toc-meta,
.page-about .toc-link:focus-visible .toc-meta {
  color: var(--ink-950);
}

@media (min-width: 1000px) {
  .page-about .about-index {
    position: sticky;
    top: calc(var(--header-h) + 32px);
    align-self: start;
    border-top: 0;
    border-left: 1px solid var(--line);
    padding: 2px 0 2px 20px;
  }

  .page-about .about-toc {
    flex-direction: column;
    overflow: visible;
    gap: 0;
    margin-top: 16px;
  }

  .page-about .toc-link {
    border: 0;
    border-radius: 0;
    padding: 8px 0;
    white-space: normal;
    font-size: 14px;
  }

  .page-about .toc-link:hover,
  .page-about .toc-link:focus-visible {
    color: var(--live);
    background: transparent;
  }

  .page-about .toc-link:hover .toc-meta,
  .page-about .toc-link:focus-visible .toc-meta {
    color: var(--live);
  }
}

/* 正文列 */
.page-about .about-body {
  display: flex;
  flex-direction: column;
  gap: var(--about-gap);
  min-width: 0;
}

.page-about .about-section {
  scroll-margin-top: calc(var(--header-h) + 26px);
  min-width: 0;
}

.page-about .section-no {
  margin: 0 0 8px;
  font-size: 12px;
  letter-spacing: 0.3em;
  color: var(--live);
}

.page-about .about-section h2 {
  margin: 0 0 18px;
  font-size: clamp(22px, 3.4vw, 34px);
  line-height: 1.24;
  font-weight: 800;
  letter-spacing: -0.01em;
  max-width: 26ch;
}

.page-about .prose p {
  margin: 0 0 14px;
  color: var(--muted);
  font-size: clamp(15px, 1.5vw, 17px);
  line-height: 1.85;
}

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

/* 品牌起点 */
.page-about .origin-grid {
  display: grid;
  gap: clamp(20px, 3vw, 34px);
}

@media (min-width: 840px) {
  .page-about .origin-grid {
    grid-template-columns: minmax(0, 1.4fr) minmax(0, 0.85fr);
    align-items: start;
  }
}

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

.page-about .origin-figure .media-frame {
  border: 1px solid var(--line);
  border-radius: var(--r-m);
  overflow: hidden;
  aspect-ratio: 3 / 4;
  background: var(--ink-900);
}

.page-about .team-figure .media-frame,
.page-about .milestone-band .media-frame {
  border: 1px solid var(--line);
  border-radius: var(--r-m);
  overflow: hidden;
  background: var(--ink-900);
}

.page-about .team-figure .media-frame {
  aspect-ratio: 3 / 2;
}

.page-about .milestone-band .media-frame {
  aspect-ratio: 7 / 4;
}

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

.page-about .media-caption {
  display: block;
  margin-top: 10px;
  font-size: 12px;
  line-height: 1.6;
  color: var(--muted);
}

.page-about .team-figure {
  margin: clamp(20px, 3vw, 30px) 0 clamp(20px, 3vw, 30px);
}

/* 团队分组 */
.page-about .team-grid {
  display: grid;
  gap: 12px;
}

@media (min-width: 780px) {
  .page-about .team-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    align-items: start;
  }
}

.page-about .team-card {
  background: var(--ink-900);
  border: 1px solid var(--line);
  border-radius: var(--r-m);
  padding: 15px 16px 16px;
  transition: border-color 0.24s var(--ease), background 0.24s var(--ease);
}

.page-about .team-card[open] {
  background: var(--ink-800);
  border-color: var(--live);
}

.page-about .team-card summary {
  list-style: none;
  cursor: pointer;
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 8px;
}

.page-about .team-card summary::-webkit-details-marker {
  display: none;
}

.page-about .team-idx {
  font-size: 11px;
  letter-spacing: 0.22em;
  color: var(--sub);
}

.page-about .team-name {
  font-size: 17px;
  font-weight: 800;
  color: var(--text);
}

.page-about .team-meta {
  flex: 1 0 100%;
  font-size: 12px;
  line-height: 1.6;
  color: var(--muted);
}

.page-about .team-card p {
  margin: 12px 0 0;
  padding-top: 12px;
  border-top: 1px dashed var(--line);
  font-size: 14px;
  line-height: 1.78;
  color: var(--muted);
}

/* 版本演进 */
.page-about .milestone-band {
  margin: 0 0 clamp(18px, 3vw, 26px);
}

.page-about .milestone-track {
  list-style: none;
  margin: 0;
  padding: 0 0 10px;
  display: grid;
  grid-auto-flow: column;
  grid-auto-columns: minmax(238px, 78%);
  gap: 14px;
  overflow-x: auto;
  scroll-snap-type: x mandatory;
}

@media (min-width: 880px) {
  .page-about .milestone-track {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    grid-auto-flow: row;
    grid-auto-columns: auto;
    overflow: visible;
    gap: 12px;
  }
}

.page-about .milestone {
  scroll-snap-align: start;
  background: var(--ink-800);
  border: 1px solid var(--line);
  border-radius: var(--r-m);
  padding: 16px;
  display: flex;
  flex-direction: column;
  gap: 8px;
  min-width: 0;
  transition: border-color 0.25s var(--ease), transform 0.25s var(--ease);
}

.page-about .milestone:hover,
.page-about .milestone:focus-within {
  border-color: var(--live);
  transform: translateY(-3px);
}

.page-about .milestone-ver {
  font-size: 12px;
  letter-spacing: 0.24em;
  color: var(--live);
}

.page-about .milestone-title {
  margin: 0;
  font-size: 17px;
  font-weight: 800;
  line-height: 1.35;
  color: var(--text);
}

.page-about .milestone-note {
  margin: 0;
  font-size: 14px;
  line-height: 1.72;
  color: var(--muted);
}

.page-about .milestone-extra {
  margin: 0;
  font-size: 13px;
  line-height: 1.7;
  color: var(--warn);
}

@media (hover: hover) and (min-width: 880px) {
  .page-about .milestone-extra {
    max-height: 0;
    opacity: 0;
    overflow: hidden;
    transition: max-height 0.32s var(--ease), opacity 0.32s var(--ease);
  }

  .page-about .milestone:hover .milestone-extra,
  .page-about .milestone:focus-within .milestone-extra {
    max-height: 140px;
    opacity: 1;
  }
}

/* 战报做法 */
.page-about .method-card {
  position: relative;
  background: var(--paper);
  color: var(--ink-900);
  border-radius: var(--r-l);
  padding: clamp(22px, 4vw, 40px);
  box-shadow: var(--shadow);
  display: flex;
  flex-direction: column;
  gap: clamp(16px, 2.4vw, 22px);
}

.page-about .method-card .stamp {
  align-self: flex-start;
  border: 1px solid var(--ink-950);
  color: var(--ink-950);
  font-size: 11px;
  letter-spacing: 0.22em;
  padding: 5px 10px;
  border-radius: 4px;
  background: transparent;
}

.page-about .method-copy p {
  color: var(--ink-900);
  opacity: 0.86;
}

.page-about .method-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 10px;
  border-top: 1px solid rgba(8, 17, 15, 0.25);
  padding-top: 16px;
}

.page-about .method-list li {
  display: flex;
  align-items: baseline;
  gap: 10px;
  font-size: 14px;
  line-height: 1.6;
  color: var(--ink-900);
}

.page-about .method-list .font-num {
  min-width: 3.2em;
  font-weight: 800;
  font-size: 18px;
  color: var(--ink-950);
  letter-spacing: -0.01em;
}

.page-about .method-card .btn-row {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

/* 数据来源 */
.page-about .source-split {
  display: grid;
  gap: clamp(20px, 3vw, 40px);
}

@media (min-width: 800px) {
  .page-about .source-split {
    grid-template-columns: minmax(0, 0.85fr) minmax(0, 1.15fr);
    align-items: start;
  }
}

.page-about .source-figures {
  display: flex;
  flex-direction: column;
  gap: 20px;
  border-left: 3px solid var(--live);
  padding-left: 18px;
}

.page-about .source-fig {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.page-about .source-fig .fig-num {
  font-size: clamp(26px, 4.4vw, 38px);
  font-weight: 900;
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--live);
}

.page-about .source-fig .fig-label {
  font-size: 13px;
  line-height: 1.6;
  color: var(--muted);
}

/* 看台气质 */
.page-about .culture-grid {
  display: grid;
  gap: clamp(20px, 3vw, 34px);
}

@media (min-width: 820px) {
  .page-about .culture-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

.page-about .culture-card {
  border-top: 2px solid var(--line);
  padding-top: 16px;
  min-width: 0;
}

.page-about .culture-card h3 {
  margin: 0 0 10px;
  font-size: 17px;
  font-weight: 800;
  color: var(--text);
}

.page-about .culture-card p {
  margin: 0;
  font-size: 15px;
  line-height: 1.85;
  color: var(--muted);
}

/* 收尾 */
.page-about .about-cta {
  background: var(--ink-900);
  border: 1px solid var(--line);
  border-radius: var(--r-l);
  padding: clamp(20px, 4vw, 36px);
  display: grid;
  gap: 18px;
}

@media (min-width: 780px) {
  .page-about .about-cta {
    grid-template-columns: minmax(0, 1fr) auto;
    align-items: center;
    gap: 28px;
  }
}

.page-about .about-cta h2 {
  margin: 0 0 10px;
  font-size: clamp(19px, 2.4vw, 26px);
  font-weight: 800;
  line-height: 1.3;
}

.page-about .cta-text {
  margin: 0;
}

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

.page-about .about-cta .btn-row {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

/* 窄屏兜底 */
@media (max-width: 520px) {
  .page-about .about-body {
    gap: 44px;
  }

  .page-about .method-list li {
    flex-direction: column;
    gap: 2px;
  }

  .page-about .method-list .font-num {
    min-width: 0;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .milestone,
  .page-about .toc-link,
  .page-about .team-card {
    transition: none;
  }

  .page-about .milestone:hover,
  .page-about .milestone:focus-within {
    transform: none;
  }
}