.page-about {
  --ab-cut: 12px;
  --ab-pad: 20px;
  --ab-gap: 22px;
  color: var(--bone);
}

/* ---------- 首屏 ---------- */
.page-about .ab-hero {
  display: grid;
  gap: 26px;
  padding: 22px 0 34px;
}

.page-about .ab-hero-title {
  margin: 10px 0 16px;
  font-size: clamp(2rem, 7.2vw, 3.4rem);
  line-height: 1.06;
  letter-spacing: -0.02em;
  font-weight: 900;
  color: var(--bone);
}

.page-about .ab-hero-lead {
  margin: 0 0 16px;
  font-size: 1.05rem;
  line-height: 1.7;
  color: var(--bone);
  max-width: 46ch;
}

.page-about .ab-hero-text {
  margin: 0 0 22px;
  color: var(--silver);
}

.page-about .ab-hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.page-about .ab-hero-media {
  margin: 0;
  border: 1px solid var(--line);
  border-left: 3px solid var(--neon);
  background: var(--panel);
  padding: 12px 12px 0;
}

.page-about .ab-hero-media img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
}

.page-about .ab-hero-media .media__cap {
  padding: 12px 4px 14px;
  font-size: 13px;
  color: var(--silver);
  line-height: 1.6;
}

/* ---------- 数字条 ---------- */
.page-about .ab-stats {
  margin: 0 0 4px;
  padding: 22px 0;
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}

.page-about .ab-stats .stat-value {
  font-family: var(--font-mono);
  letter-spacing: 0.01em;
  color: var(--neon);
  font-size: clamp(1.6rem, 4.6vw, 2.2rem);
  line-height: 1.1;
}

.page-about .ab-stats .stat-label {
  margin-top: 6px;
  font-size: 13px;
  line-height: 1.5;
  color: var(--silver);
}

/* ---------- 版本时间轴 ---------- */
.page-about .ab-versions .section-head {
  margin-bottom: 22px;
}

.page-about .ab-yrs {
  display: flex;
  gap: 8px;
  overflow-x: auto;
  padding: 4px 2px 14px;
  -webkit-overflow-scrolling: touch;
}

.page-about .ab-yr {
  flex: 0 0 auto;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 9px 15px;
  border: 1px solid var(--line);
  background: var(--panel);
  color: var(--silver);
  font-size: 13px;
  line-height: 1;
  text-decoration: none;
  clip-path: polygon(0 0, calc(100% - 10px) 0, 100% 10px, 100% 100%, 0 100%);
  transition: color var(--t-fast) var(--ease), border-color var(--t-fast) var(--ease), background-color var(--t-fast) var(--ease);
}

.page-about .ab-yr .mono {
  color: var(--neon);
  font-size: 12px;
}

.page-about .ab-yr:hover,
.page-about .ab-yr:focus-visible {
  color: var(--bone);
  border-color: var(--neon);
  background: var(--panel-hi);
}

.page-about .ab-band {
  margin: 0 0 26px;
  border: 1px solid var(--line);
  overflow: hidden;
}

.page-about .ab-band img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
  filter: saturate(0.85) brightness(0.9);
}

.page-about .ab-timeline {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: var(--ab-gap);
}

.page-about .ab-ver {
  display: grid;
  gap: 10px;
  scroll-margin-top: 110px;
}

.page-about .ab-ver-rail {
  display: flex;
  align-items: center;
  gap: 12px;
}

.page-about .ab-ver-num {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 46px;
  height: 32px;
  font-family: var(--font-mono);
  font-size: 14px;
  font-weight: 700;
  color: var(--pitch);
  background: var(--neon);
  clip-path: polygon(0 0, calc(100% - 10px) 0, 100% 10px, 100% 100%, 0 100%);
}

.page-about .ab-ver-year {
  font-size: 13px;
  letter-spacing: 0.06em;
  color: var(--silver);
}

.page-about .ab-ver-body {
  padding: var(--ab-pad);
  position: relative;
}

.page-about .ab-ver-body::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 2px;
  background: linear-gradient(180deg, var(--neon), transparent 80%);
  opacity: 0;
  transition: opacity var(--t-panel) var(--ease);
}

.page-about .ab-ver:hover .ab-ver-body::before,
.page-about .ab-ver:focus-within .ab-ver-body::before {
  opacity: 1;
}

.page-about .ab-ver-title {
  margin: 0 0 10px;
  font-family: var(--font-editorial);
  font-size: 1.12rem;
  line-height: 1.5;
  font-weight: 600;
  color: var(--bone);
}

.page-about .ab-ver-text {
  margin: 0 0 12px;
  font-size: 15px;
  line-height: 1.75;
  color: var(--silver);
}

.page-about .ab-ver-fix {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 8px;
  margin: 0;
  padding-top: 12px;
  border-top: 1px dashed var(--line);
  font-size: 14px;
  line-height: 1.6;
  color: var(--bone);
}

/* ---------- 两种读法 ---------- */
.page-about .ab-reading .tabs {
  margin-top: 8px;
}

.page-about .ab-tabs .tablist {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 18px;
}

.page-about .ab-panel {
  border: 1px solid var(--line);
  background: var(--panel);
  padding: 20px;
  clip-path: polygon(0 0, calc(100% - 14px) 0, 100% 14px, 100% 100%, 0 100%);
}

.page-about .ab-read-grid {
  display: grid;
  gap: 20px;
}

.page-about .ab-read-title {
  margin: 0 0 12px;
  font-family: var(--font-editorial);
  font-size: 1.15rem;
  line-height: 1.5;
  font-weight: 600;
  color: var(--bone);
}

.page-about .ab-read-copy p {
  margin: 0 0 12px;
  font-size: 15px;
  line-height: 1.8;
  color: var(--silver);
}

.page-about .ab-read-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
}

.page-about .ab-read-list li {
  display: flex;
  gap: 10px;
  padding: 11px 14px;
  background: var(--panel-hi);
  font-size: 14px;
  line-height: 1.55;
  color: var(--bone);
}

.page-about .ab-read-list .mono {
  flex: 0 0 auto;
  color: var(--neon);
  font-size: 12px;
  padding-top: 2px;
}

.page-about .ab-panel-foot {
  margin: 16px 0 0;
  font-size: 14px;
}

/* ---------- 内容团队 ---------- */
.page-about .section--bone {
  color: var(--pitch);
}

.page-about .ab-team-grid {
  display: grid;
  gap: 22px;
  margin-top: 6px;
}

.page-about .ab-team-media {
  margin: 0;
  border: 1px solid #C6D2CC;
  border-bottom: 3px solid var(--track);
  overflow: hidden;
}

.page-about .ab-team-media img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
}

.page-about .ab-team-copy p {
  margin: 0 0 14px;
  font-size: 15px;
  line-height: 1.85;
  color: #23342E;
  max-width: 68ch;
}

.page-about .ab-team-link {
  margin-top: 18px;
  padding-top: 16px;
  border-top: 1px solid #C6D2CC;
}

/* ---------- 长期做法 ---------- */
.page-about .ab-practices .section-head {
  margin-bottom: 20px;
}

.page-about .ab-practice-list {
  display: grid;
  gap: 1px;
  background: var(--line);
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}

.page-about .ab-practice {
  display: grid;
  gap: 8px;
  padding: 20px 4px;
  background: var(--pitch);
}

.page-about .ab-practice-title {
  margin: 0;
  font-family: var(--font-editorial);
  font-size: 1.02rem;
  line-height: 1.5;
  font-weight: 600;
  color: var(--neon);
}

.page-about .ab-practice p {
  margin: 0;
  font-size: 15px;
  line-height: 1.8;
  color: var(--silver);
  max-width: 62ch;
}

/* ---------- 站点归属与联系 ---------- */
.page-about .ab-owner-grid {
  display: grid;
  gap: 24px;
  margin-top: 6px;
}

.page-about .ab-owner-copy p {
  margin: 0 0 14px;
  font-size: 15px;
  line-height: 1.85;
  color: #23342E;
  max-width: 62ch;
}

.page-about .ab-owner-meta {
  display: inline-block;
  margin-top: 4px;
  padding: 8px 12px;
  border: 1px solid #C6D2CC;
  font-size: 12px;
  letter-spacing: 0.04em;
  color: #4A6159;
}

.page-about .ab-contacts {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 1px;
  background: #D6DFDA;
  border: 1px solid #C6D2CC;
}

.page-about .ab-contacts .contact-item {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  align-items: center;
  gap: 6px 14px;
  padding: 14px 16px;
  background: var(--bone);
}

.page-about .ab-contacts .contact-label {
  grid-column: 1 / -1;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: #6E847B;
}

.page-about .ab-contacts .contact-value {
  font-size: 14px;
  line-height: 1.5;
  color: var(--pitch);
  word-break: break-all;
}

.page-about .section--bone .copy-btn {
  grid-column: 2;
  border-color: #C6D2CC;
  background: transparent;
  color: var(--pitch);
}

.page-about .section--bone .copy-btn:hover,
.page-about .section--bone .copy-btn:focus-visible {
  border-color: var(--pitch);
}

/* ---------- 响应式 ---------- */
@media (min-width: 640px) {
  .page-about .ab-hero {
    padding: 30px 0 44px;
  }

  .page-about .ab-ver-body {
    padding: 24px 26px;
  }

  .page-about .ab-panel {
    padding: 26px 28px;
  }

  .page-about .ab-practice {
    grid-template-columns: 200px minmax(0, 1fr);
    align-items: baseline;
    gap: 6px 24px;
    padding: 22px 4px;
  }

  .page-about .ab-contacts {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
  }
}

@media (min-width: 900px) {
  .page-about .ab-hero {
    grid-template-columns: minmax(0, 1.3fr) minmax(0, 0.7fr);
    gap: 46px;
    align-items: start;
    padding: 44px 0 60px;
  }

  .page-about .ab-hero-media {
    margin-top: 8px;
  }

  .page-about .ab-ver {
    grid-template-columns: 150px minmax(0, 1fr);
    gap: 26px;
    align-items: start;
  }

  .page-about .ab-ver-rail {
    flex-direction: column;
    align-items: flex-start;
    gap: 10px;
    padding-top: 6px;
  }

  .page-about .ab-ver-year {
    padding-left: 4px;
  }

  .page-about .ab-read-grid {
    grid-template-columns: minmax(0, 1.15fr) minmax(0, 0.85fr);
    gap: 32px;
    align-items: start;
  }

  .page-about .ab-team-grid {
    grid-template-columns: minmax(0, 0.85fr) minmax(0, 1.15fr);
    gap: 36px;
    align-items: start;
  }

  .page-about .ab-owner-grid {
    grid-template-columns: minmax(0, 0.9fr) minmax(0, 1.1fr);
    gap: 42px;
    align-items: start;
  }
}

@media (min-width: 1200px) {
  .page-about .ab-stats {
    padding: 26px 0;
  }

  .page-about .ab-timeline {
    gap: 26px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .ab-yr,
  .page-about .ab-ver-body::before {
    transition: none;
  }
}