.page-about {
  display: block;
  color: var(--silver);
  background: var(--ink);
}

.page-about .ab-hero {
  position: relative;
  padding: 28px 0 48px;
  border-bottom: 1px solid var(--line-gold);
  background:
    radial-gradient(90% 70% at 88% 6%, rgba(240, 180, 41, 0.10), transparent 62%),
    radial-gradient(70% 60% at 2% 98%, rgba(59, 16, 24, 0.85), transparent 70%),
    var(--ink);
  overflow: hidden;
}

.page-about .ab-hero .breadcrumb {
  margin-bottom: 28px;
  font-size: 13px;
  letter-spacing: 0.06em;
  color: var(--dim);
}

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

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

.page-about .ab-hero .breadcrumb span {
  margin: 0 6px;
}

.page-about .ab-hero__grid {
  display: grid;
  gap: 34px;
}

.page-about .ab-hero__lead {
  max-width: 46ch;
  margin-top: 22px;
  font-size: clamp(16px, 2.1vw, 18px);
  line-height: 1.9;
  color: var(--silver);
}

.page-about .ab-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 28px;
}

.page-about .ab-stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin: 0;
  padding: 0;
  background: var(--line-gold);
  border: 1px solid var(--line-gold);
}

.page-about .ab-stats > div {
  background: var(--ink);
  padding: 16px 14px 18px;
}

.page-about .ab-stats dt {
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--dim);
  line-height: 1.6;
}

.page-about .ab-stats dd {
  margin: 10px 0 0;
  font-family: var(--font-mono);
  font-size: clamp(23px, 6vw, 32px);
  font-weight: 700;
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--gold);
}

.page-about .ab-section {
  padding: 56px 0;
  border-bottom: 1px solid rgba(122, 90, 30, 0.22);
}

.page-about .ab-section--timeline {
  background:
    linear-gradient(180deg, rgba(59, 16, 24, 0.42), transparent 220px),
    var(--ink);
}

.page-about .ab-section--region {
  background: linear-gradient(180deg, rgba(14, 20, 24, 0.9), var(--ink));
}

.page-about .ab-section--next {
  border-bottom: 0;
}

.page-about .ab-section__head {
  max-width: 720px;
  margin-bottom: 36px;
}

.page-about .ab-section__intro {
  margin-top: 16px;
  font-size: 15.5px;
  line-height: 1.9;
  color: var(--dim);
}

/* 品牌主张 */
.page-about .ab-stance {
  display: grid;
  gap: 34px;
}

.page-about .ab-stance__text p {
  max-width: 62ch;
  margin-top: 16px;
  font-size: 15.5px;
  line-height: 1.95;
  color: var(--silver);
}

.page-about .ab-stance__figure img {
  width: 100%;
  aspect-ratio: 11 / 14;
  object-fit: cover;
}

.page-about .ab-audience {
  list-style: none;
  margin: 30px 0 0;
  padding: 0;
  display: grid;
  gap: 0;
}

.page-about .ab-audience li {
  display: grid;
  grid-template-columns: 38px minmax(0, 1fr);
  gap: 12px;
  align-items: baseline;
  padding: 13px 0;
  border-bottom: 1px solid rgba(122, 90, 30, 0.28);
  font-size: 15px;
  line-height: 1.75;
  color: var(--silver);
}

.page-about .ab-audience li .mono {
  color: var(--gold);
  font-size: 12.5px;
  letter-spacing: 0.12em;
}

/* 时间线 */
.page-about .ab-timeline {
  display: grid;
  gap: 30px;
}

.page-about .ab-rail__label {
  margin: 0 0 12px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.3em;
  color: var(--dim);
}

.page-about .ab-rail__list {
  list-style: none;
  display: flex;
  gap: 8px;
  margin: 0;
  padding: 0 0 8px;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
}

.page-about .ab-rail__list a {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 9px 13px;
  border: 1px solid var(--line-gold);
  color: var(--dim);
  font-size: 13px;
  line-height: 1.4;
  white-space: nowrap;
  text-decoration: none;
  transition: color 0.24s var(--ease), border-color 0.24s var(--ease);
}

.page-about .ab-rail__list a .mono {
  font-size: 11px;
  color: var(--gold-dark);
}

.page-about .ab-rail__list a:hover,
.page-about .ab-rail__list a:focus-visible {
  color: var(--cream);
  border-color: var(--gold);
}

.page-about .ab-rail__list a:hover .mono,
.page-about .ab-rail__list a:focus-visible .mono {
  color: var(--gold);
}

.page-about .ab-timeline__track {
  position: relative;
  display: grid;
  gap: 22px;
}

.page-about .ab-stage {
  position: relative;
  scroll-margin-top: 120px;
  padding: 22px 20px 20px;
  background: var(--panel);
  border: 2px solid var(--line-gold);
  border-right-color: rgba(51, 193, 240, 0.55);
  box-shadow: var(--shadow-hard);
  transition: transform 0.24s var(--ease), box-shadow 0.24s var(--ease), border-color 0.24s var(--ease);
}

.page-about .ab-stage:hover,
.page-about .ab-stage:focus-within {
  transform: translateY(-4px);
  box-shadow: var(--shadow-hard-hover);
  border-color: rgba(240, 180, 41, 0.72);
  border-right-color: var(--blue);
}

.page-about .ab-stage__head {
  display: flex;
  align-items: flex-start;
  gap: 14px;
  margin-bottom: 14px;
}

.page-about .ab-stage__num {
  flex: 0 0 auto;
  padding: 3px 8px;
  background: var(--gold);
  color: var(--ink);
  font-size: 12.5px;
  font-weight: 700;
  letter-spacing: 0.08em;
  line-height: 1.6;
}

.page-about .ab-stage__title {
  margin: 0;
  font-family: var(--font-display);
  font-size: clamp(20px, 3vw, 24px);
  font-weight: 800;
  letter-spacing: -0.01em;
  color: var(--cream);
}

.page-about .ab-stage__meta {
  margin: 6px 0 0;
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--dim);
}

.page-about .ab-stage__body {
  max-width: 68ch;
  margin: 0;
  font-size: 15.5px;
  line-height: 1.9;
  color: var(--silver);
}

.page-about .ab-stage .disclosure {
  margin-top: 16px;
  padding-top: 12px;
  border-top: 1px solid rgba(122, 90, 30, 0.3);
}

.page-about .ab-stage summary {
  cursor: pointer;
  list-style: none;
  font-family: var(--font-mono);
  font-size: 12.5px;
  letter-spacing: 0.12em;
  color: var(--blue);
}

.page-about .ab-stage summary::-webkit-details-marker {
  display: none;
}

.page-about .ab-stage summary::before {
  content: "＋ ";
}

.page-about .ab-stage details[open] summary::before {
  content: "－ ";
}

.page-about .ab-stage .disclosure__body p {
  max-width: 68ch;
  margin: 12px 0 0;
  font-size: 14.5px;
  line-height: 1.85;
  color: var(--dim);
}

/* 覆盖范围 tabs */
.page-about .ab-tabs {
  margin-top: 4px;
}

.page-about .ab-tabs .tabs__list {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  padding-bottom: 16px;
  border-bottom: 1px solid var(--line-gold);
}

.page-about .ab-tabs .tabs__btn {
  appearance: none;
  padding: 10px 18px;
  background: transparent;
  border: 1px solid var(--line-gold);
  color: var(--dim);
  font-family: var(--font-body);
  font-size: 14px;
  letter-spacing: 0.06em;
  cursor: pointer;
  transition: color 0.24s var(--ease), border-color 0.24s var(--ease), background-color 0.24s var(--ease);
}

.page-about .ab-tabs .tabs__btn:hover {
  color: var(--silver);
  border-color: rgba(240, 180, 41, 0.6);
}

.page-about .ab-tabs .tabs__btn[aria-selected="true"] {
  background: var(--gold);
  border-color: var(--gold);
  color: var(--ink);
  font-weight: 600;
}

.page-about .ab-tabs .tabs__panel {
  max-width: 720px;
  margin-top: 26px;
  padding-left: 20px;
  border-left: 2px solid var(--line-gold);
}

.page-about .ab-tabs .tabs__panel h3 {
  margin: 0 0 12px;
  font-family: var(--font-display);
  font-size: 20px;
  font-weight: 800;
  letter-spacing: -0.01em;
  color: var(--cream);
}

.page-about .ab-tabs .tabs__panel p {
  margin: 0;
  font-size: 15.5px;
  line-height: 1.9;
  color: var(--silver);
}

.page-about .ab-facts {
  list-style: none;
  margin: 18px 0 0;
  padding: 0;
  display: grid;
  gap: 10px;
}

.page-about .ab-facts li {
  position: relative;
  padding-left: 20px;
  font-size: 14.5px;
  line-height: 1.8;
  color: var(--dim);
}

.page-about .ab-facts li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.72em;
  width: 10px;
  height: 1px;
  background: var(--gold-dark);
}

.page-about .ab-coverage__note {
  max-width: 720px;
  margin: 30px 0 0;
  padding-top: 18px;
  border-top: 1px dashed rgba(122, 90, 30, 0.35);
  font-size: 14px;
  line-height: 1.85;
  color: var(--dim);
}

/* 团队矩阵 */
.page-about .ab-team {
  display: grid;
  gap: 32px;
}

.page-about .ab-team__intro {
  max-width: 720px;
}

.page-about .ab-team__intro p {
  margin-top: 16px;
  font-size: 15.5px;
  line-height: 1.9;
  color: var(--silver);
}

.page-about .ab-matrix {
  list-style: none;
  display: grid;
  grid-template-columns: 1fr;
  gap: 14px;
  margin: 0;
  padding: 0;
}

.page-about .ab-matrix__col {
  padding: 22px 18px 24px;
  background: var(--panel);
  border: 1px solid var(--line-gold);
  border-top: 3px solid var(--gold-dark);
  transition: transform 0.24s var(--ease), border-color 0.24s var(--ease), background-color 0.24s var(--ease);
}

.page-about .ab-matrix__col:hover {
  transform: translateY(-4px);
  background: #1A1D24;
  border-top-color: var(--gold);
  border-color: rgba(240, 180, 41, 0.5);
  border-top-color: var(--gold);
}

.page-about .ab-matrix__idx {
  display: block;
  font-size: 12px;
  letter-spacing: 0.16em;
  color: var(--gold);
}

.page-about .ab-matrix__col h3 {
  margin: 12px 0 10px;
  font-family: var(--font-display);
  font-size: 19px;
  font-weight: 800;
  letter-spacing: -0.01em;
  color: var(--cream);
}

.page-about .ab-matrix__col p {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.85;
  color: var(--dim);
}

.page-about .ab-team__figure img {
  width: 100%;
  aspect-ratio: 12 / 7;
  object-fit: cover;
}

/* 内容流程 */
.page-about .ab-steps {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 26px;
}

.page-about .ab-step {
  display: grid;
  grid-template-columns: 46px minmax(0, 1fr);
  gap: 16px;
  padding-bottom: 26px;
  border-bottom: 1px solid rgba(122, 90, 30, 0.25);
}

.page-about .ab-step:last-child {
  padding-bottom: 0;
  border-bottom: 0;
}

.page-about .ab-step__num {
  padding-top: 8px;
  border-top: 2px solid var(--gold-dark);
  font-family: var(--font-mono);
  font-size: 15px;
  letter-spacing: 0.06em;
  color: var(--gold);
}

.page-about .ab-step__title {
  margin: 4px 0 10px;
  font-family: var(--font-display);
  font-size: 20px;
  font-weight: 800;
  letter-spacing: -0.01em;
  color: var(--cream);
}

.page-about .ab-step__text {
  max-width: 66ch;
  margin: 0;
  font-size: 15px;
  line-height: 1.9;
  color: var(--silver);
}

.page-about .ab-standards__note {
  max-width: 720px;
  margin: 32px 0 0;
  padding: 18px 20px;
  background: rgba(22, 24, 29, 0.85);
  border: 2px solid var(--line-gold);
  font-size: 14.5px;
  line-height: 1.85;
  color: var(--silver);
}

/* 备案与服务地区 */
.page-about .ab-region {
  display: grid;
  gap: 30px;
}

.page-about .ab-region__text p {
  max-width: 60ch;
  margin-top: 16px;
  font-size: 15.5px;
  line-height: 1.9;
  color: var(--silver);
}

.page-about .ab-region__facts {
  list-style: none;
  margin: 26px 0 0;
  padding: 0;
  display: grid;
  gap: 10px;
}

.page-about .ab-region__facts li {
  display: flex;
  gap: 14px;
  align-items: baseline;
  padding-bottom: 10px;
  border-bottom: 1px dashed rgba(122, 90, 30, 0.32);
}

.page-about .ab-region__facts .ab-k {
  flex: 0 0 76px;
  font-size: 12.5px;
  letter-spacing: 0.12em;
  color: var(--dim);
}

.page-about .ab-region__facts .ab-v {
  font-size: 14.5px;
  line-height: 1.7;
  color: var(--cream);
}

.page-about .ab-region__figure img {
  width: 100%;
  aspect-ratio: 2 / 1;
  object-fit: cover;
}

/* 继续阅读 */
.page-about .ab-next-grid {
  display: grid;
  gap: 16px;
  margin-top: 4px;
}

.page-about .ab-next {
  display: block;
  padding: 22px 20px 24px;
  background: var(--panel);
  border: 2px solid var(--line-gold);
  box-shadow: var(--shadow-hard);
  color: var(--silver);
  text-decoration: none;
  transition: transform 0.24s var(--ease), box-shadow 0.24s var(--ease), border-color 0.24s var(--ease);
}

.page-about .ab-next:hover,
.page-about .ab-next:focus-visible {
  transform: translateY(-4px);
  box-shadow: var(--shadow-hard-hover);
  border-color: var(--gold);
}

.page-about .ab-next__idx {
  display: block;
  font-size: 12px;
  letter-spacing: 0.18em;
  color: var(--gold);
}

.page-about .ab-next h3 {
  margin: 12px 0 10px;
  font-family: var(--font-display);
  font-size: 20px;
  font-weight: 800;
  letter-spacing: -0.01em;
  color: var(--cream);
}

.page-about .ab-next p {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.85;
  color: var(--dim);
}

.page-about .ab-next:hover h3,
.page-about .ab-next:focus-visible h3 {
  color: var(--gold);
}

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

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

@media (min-width: 768px) {
  .page-about .ab-hero {
    padding: 40px 0 64px;
  }

  .page-about .ab-section {
    padding: 72px 0;
  }

  .page-about .ab-section__head {
    margin-bottom: 44px;
  }

  .page-about .ab-region__facts .ab-k {
    flex-basis: 88px;
  }
}

@media (min-width: 960px) {
  .page-about .ab-stance {
    grid-template-columns: minmax(0, 1.08fr) minmax(0, 0.82fr);
    gap: 56px;
    align-items: start;
  }

  .page-about .ab-region {
    grid-template-columns: minmax(0, 0.94fr) minmax(0, 1.06fr);
    gap: 52px;
    align-items: center;
  }
}

@media (min-width: 1024px) {
  .page-about .ab-hero__grid {
    grid-template-columns: minmax(0, 1.5fr) minmax(288px, 0.72fr);
    gap: 56px;
    align-items: end;
  }

  .page-about .ab-timeline {
    grid-template-columns: 176px minmax(0, 1fr);
    gap: 56px;
  }

  .page-about .ab-rail {
    position: sticky;
    top: 112px;
    align-self: start;
  }

  .page-about .ab-rail__list {
    display: grid;
    gap: 0;
    overflow: visible;
    padding: 0;
  }

  .page-about .ab-rail__list a {
    padding: 12px 0 12px 15px;
    border: 0;
    border-left: 2px solid rgba(122, 90, 30, 0.35);
    white-space: normal;
  }

  .page-about .ab-rail__list a:hover,
  .page-about .ab-rail__list a:focus-visible {
    border-left-color: var(--gold);
    color: var(--gold);
  }

  .page-about .ab-timeline__track::before {
    content: "";
    position: absolute;
    left: -28px;
    top: 8px;
    bottom: 8px;
    width: 1px;
    background: linear-gradient(180deg, rgba(240, 180, 41, 0.6), rgba(122, 90, 30, 0.14));
  }

  .page-about .ab-stage:nth-child(even) {
    margin-left: 44px;
  }

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

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

@media (prefers-reduced-motion: reduce) {
  .page-about * {
    transition: none !important;
    animation: none !important;
  }

  .page-about .ab-stage:hover,
  .page-about .ab-stage:focus-within,
  .page-about .ab-matrix__col:hover,
  .page-about .ab-next:hover,
  .page-about .ab-next:focus-visible {
    transform: none;
  }
}