.page-about {
  --ab-gutter: 18px;
  padding-bottom: 64px;
}

.page-about img {
  display: block;
  max-width: 100%;
  height: auto;
}

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

.page-about .crumb {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  font-family: var(--font-mono);
  font-size: 12.5px;
  letter-spacing: .06em;
  color: var(--slate-300);
}

.page-about .crumb a {
  color: var(--slate-300);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color .2s var(--ease), border-color .2s var(--ease);
}

.page-about .crumb a:hover {
  color: var(--gold-200);
  border-bottom-color: rgba(241, 223, 168, .6);
}

.page-about .ab-band {
  position: relative;
  margin-top: 20px;
  padding: 26px var(--ab-gutter) 28px;
  background:
    radial-gradient(130% 120% at 100% 0%, rgba(200, 16, 46, .10), transparent 58%),
    linear-gradient(140deg, var(--ink-800), var(--ink-900) 66%);
  border: var(--rule);
}

.page-about .ab-band::before {
  content: "";
  position: absolute;
  top: -1px;
  left: -1px;
  width: 72px;
  height: 2px;
  background: var(--gold-400);
}

.page-about .ab-band .band__title {
  font-size: clamp(28px, 6vw, 46px);
  line-height: 1.28;
  margin: 14px 0 0;
}

.page-about .ab-band .band__lead {
  max-width: 68ch;
  margin-top: 16px;
  color: var(--slate-300);
  line-height: 1.85;
}

.page-about .ab-ribbon {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 16px var(--ab-gutter);
  margin: 24px 0 0;
  padding: 18px 0 0;
  list-style: none;
  border-top: var(--hair);
}

.page-about .ab-ribbon__label {
  display: block;
  margin-top: 4px;
  font-family: var(--font-mono);
  font-size: 12.5px;
  letter-spacing: .06em;
  color: var(--slate-300);
}

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

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

.page-about .sec {
  padding-top: 48px;
  scroll-margin-top: 112px;
}

.page-about .tl__item,
.page-about .flow__item,
.page-about .crew__item {
  scroll-margin-top: 112px;
}

.page-about .sec__head {
  display: flex;
  align-items: baseline;
  gap: 12px;
  padding-bottom: 10px;
  border-bottom: var(--hair);
}

.page-about .sec__title {
  font-size: clamp(21px, 3.4vw, 30px);
  line-height: 1.35;
  margin: 0;
}

.page-about .ab-lead {
  margin-top: 16px;
}

.page-about .ab-note {
  margin-top: 18px;
  padding-left: 14px;
  border-left: 2px solid var(--bronze-700);
}

.page-about .prose a {
  color: var(--gold-200);
  text-decoration: none;
  border-bottom: 1px solid rgba(241, 223, 168, .45);
  transition: border-color .2s var(--ease), color .2s var(--ease);
}

.page-about .prose a:hover {
  color: var(--gold-050);
  border-bottom-color: var(--gold-050);
}

/* 阶段跳转 */
.page-about .ab-jump {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 20px;
}

.page-about .ab-jump a {
  font-family: var(--font-mono);
  font-size: 12.5px;
  letter-spacing: .04em;
  color: var(--slate-300);
  padding: 6px 11px;
  border: var(--hair);
  text-decoration: none;
  transition: color .2s var(--ease), background-color .2s var(--ease), border-color .2s var(--ease);
}

.page-about .ab-jump a:hover {
  color: var(--ink-900);
  background: var(--gold-400);
  border-color: var(--gold-400);
}

.page-about .ab-jump a:focus-visible {
  outline: 2px solid var(--gold-200);
  outline-offset: 2px;
}

/* 时间轴 */
.page-about .ab-timeline {
  position: relative;
  margin-top: 26px;
  padding: 4px 0 0;
  overflow: hidden;
}

.page-about .ab-timeline__texture {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: .13;
  pointer-events: none;
  z-index: 0;
}

.page-about .tl {
  position: relative;
  z-index: 1;
  list-style: none;
  margin: 0;
  padding: 0 0 0 26px;
}

.page-about .tl::before {
  content: "";
  position: absolute;
  left: 4px;
  top: 8px;
  bottom: 8px;
  width: 1px;
  background: linear-gradient(180deg, rgba(217, 180, 95, .78), rgba(140, 106, 42, .12));
}

.page-about .tl__item {
  position: relative;
  margin: 0 0 16px;
  padding: 18px var(--ab-gutter) 20px;
  background: var(--ink-800);
  border: var(--hair);
  transition: transform .2s var(--ease), border-color .2s var(--ease), box-shadow .2s var(--ease);
}

.page-about .tl__item::before {
  content: "";
  position: absolute;
  left: -27px;
  top: 24px;
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--gold-400);
  box-shadow: 0 0 0 4px rgba(217, 180, 95, .14);
}

.page-about .tl__item:hover,
.page-about .tl__item:focus-within {
  transform: translateY(-2px);
  border-color: rgba(241, 223, 168, .52);
  box-shadow: 0 12px 26px rgba(0, 0, 0, .42);
}

.page-about .tl__tag {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .08em;
  color: var(--gold-200);
  padding: 3px 9px;
  border: var(--rule);
}

.page-about .tl__title {
  margin: 12px 0 8px;
  font-size: clamp(18px, 2.6vw, 22px);
  line-height: 1.4;
}

.page-about .tl__desc {
  margin: 0;
  max-width: 72ch;
  color: var(--slate-300);
  font-size: 15.5px;
  line-height: 1.85;
}

/* 流程 */
.page-about .ab-split {
  display: grid;
  gap: 26px;
  margin-top: 20px;
}

.page-about .flow {
  list-style: none;
  margin: 22px 0 0;
  padding: 0;
  display: grid;
  gap: 12px;
}

.page-about .flow__item {
  padding: 18px var(--ab-gutter) 18px 20px;
  background: linear-gradient(180deg, var(--ink-800), var(--ink-900));
  border: var(--hair);
  border-left: 2px solid var(--bronze-700);
  transition: transform .2s var(--ease), border-color .2s var(--ease);
}

.page-about .flow__item:hover {
  transform: translateY(-2px);
  border-left-color: var(--gold-400);
}

.page-about .flow__item:focus-visible {
  outline: 2px solid var(--gold-200);
  outline-offset: 2px;
  transform: translateY(-2px);
  border-left-color: var(--gold-400);
}

.page-about .flow__num {
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: .1em;
  color: var(--gold-400);
}

.page-about .flow__title {
  margin: 8px 0 6px;
  font-size: 18px;
}

.page-about .flow__desc {
  margin: 0;
  color: var(--slate-300);
  font-size: 15.5px;
  line-height: 1.8;
}

.page-about .ab-figure {
  margin: 0;
}

.page-about .ab-figure .media__cap {
  margin-top: 10px;
  font-size: 12.5px;
  font-family: var(--font-mono);
  letter-spacing: .03em;
  color: var(--slate-300);
}

.page-about .table-wrap {
  margin-top: 20px;
}

/* 团队 */
.page-about .crew {
  display: grid;
  gap: 14px;
  margin-top: 22px;
}

.page-about .crew__item {
  padding: 20px var(--ab-gutter);
  background: linear-gradient(180deg, var(--ink-800), var(--ink-900));
  border: var(--hair);
  border-top: 2px solid var(--bronze-700);
}

.page-about .crew__item--content {
  border-top-color: var(--gold-400);
}

.page-about .crew__item--service {
  border-top-color: var(--red-600);
}

.page-about .crew__item--tech {
  border-top-color: var(--slate-300);
}

.page-about .crew__label {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .1em;
  color: var(--gold-200);
  padding: 3px 9px;
  border: var(--rule);
}

.page-about .crew__num {
  margin: 14px 0 8px;
}

.page-about .crew__desc {
  margin: 0;
  color: var(--slate-300);
  font-size: 15.5px;
  line-height: 1.8;
}

/* 长期投入 */
.page-about .ab-list {
  list-style: none;
  margin: 18px 0 0;
  padding: 0;
  display: grid;
  gap: 10px;
}

.page-about .ab-list li {
  position: relative;
  padding-left: 20px;
  color: var(--slate-300);
  font-size: 15.5px;
  line-height: 1.8;
}

.page-about .ab-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: .72em;
  width: 9px;
  height: 1px;
  background: var(--gold-400);
}

.page-about .ab-stats {
  padding: 20px var(--ab-gutter);
  background: var(--ink-800);
  border: var(--rule);
}

.page-about .ab-stats__row {
  padding: 14px 0;
  border-bottom: var(--hair);
}

.page-about .ab-stats__row:first-child {
  padding-top: 0;
}

.page-about .ab-stats__label {
  display: block;
  margin-top: 4px;
  font-family: var(--font-mono);
  font-size: 12.5px;
  letter-spacing: .05em;
  color: var(--slate-300);
}

.page-about .ab-stats__links {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  padding-top: 18px;
}

/* 结尾邀请 */
.page-about .ab-cta {
  margin-top: 56px;
  padding: 28px var(--ab-gutter) 30px;
  border: var(--rule);
  background:
    radial-gradient(120% 130% at 0% 0%, rgba(217, 180, 95, .12), transparent 62%),
    var(--ink-800);
}

.page-about .ab-cta__code {
  font-family: var(--font-mono);
  font-size: 12.5px;
  letter-spacing: .1em;
  color: var(--gold-400);
}

.page-about .ab-cta__title {
  margin: 12px 0 10px;
  font-size: clamp(21px, 3.4vw, 30px);
  line-height: 1.36;
}

.page-about .ab-cta__lead {
  margin: 0;
  max-width: 72ch;
  color: var(--slate-300);
  line-height: 1.85;
}

.page-about .ab-cta__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 20px;
}

@media (min-width: 620px) {
  .page-about {
    --ab-gutter: 24px;
  }

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

@media (min-width: 760px) {
  .page-about .ab-band {
    padding: 34px 32px 36px;
  }

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

@media (min-width: 900px) {
  .page-about .ab-split {
    grid-template-columns: 1.3fr .9fr;
    align-items: start;
    gap: 32px;
  }

  .page-about .ab-split--reverse {
    grid-template-columns: 1.4fr .8fr;
  }

  .page-about .tl {
    padding-left: 34px;
  }

  .page-about .tl::before {
    left: 6px;
  }

  .page-about .tl__item::before {
    left: -35px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .tl__item,
  .page-about .flow__item {
    transition: none;
  }

  .page-about .tl__item:hover,
  .page-about .flow__item:hover {
    transform: none;
  }
}