.page-about {
  --ab-radius: 32px;
  --ab-radius-sm: 22px;
  --ab-track-line: rgba(53, 224, 224, 0.22);
  display: block;
}

/* ---------- 通用小结构 ---------- */
.page-about .ab-head {
  max-width: 44rem;
  margin-bottom: 1.75rem;
}

.page-about .ab-head__title {
  margin: 0.55rem 0 0.6rem;
  font-size: clamp(1.6rem, 5vw, 2.55rem);
  font-weight: 300;
  line-height: 1.14;
  letter-spacing: -0.01em;
  color: var(--mel-paper);
}

.page-about .ab-head__text {
  margin: 0;
  max-width: 40ch;
  font-size: 1rem;
  line-height: 1.75;
  color: var(--mel-muted);
}

/* ---------- 01 首屏 ---------- */
.page-about .ab-hero {
  padding-block: 1.25rem 0;
}

.page-about .ab-hero__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1.75rem;
  padding-block: 1.5rem 0.5rem;
}

.page-about .ab-hero__lead {
  min-width: 0;
}

.page-about .ab-hero__lead .mel-display {
  margin: 0.7rem 0 1rem;
}

.page-about .ab-plate {
  position: relative;
  overflow: hidden;
  padding: 1.6rem 1.5rem 1.35rem;
  border-radius: var(--ab-radius);
  border: 1px solid var(--mel-line);
  background:
    radial-gradient(120% 130% at 100% 0%, rgba(53, 224, 224, 0.14), transparent 58%),
    linear-gradient(158deg, var(--mel-violet), var(--mel-ink));
  box-shadow: 0 22px 48px -32px rgba(0, 0, 0, 0.9);
}

.page-about .ab-plate::after {
  content: "";
  position: absolute;
  inset: 12px;
  border: 1px dashed var(--ab-track-line);
  border-radius: 20px;
  pointer-events: none;
}

.page-about .ab-plate > * {
  position: relative;
  z-index: 1;
}

.page-about .ab-plate__code {
  margin: 0.5rem 0 0.85rem;
  font-size: clamp(1.5rem, 6vw, 2.2rem);
  letter-spacing: 0.08em;
  line-height: 1.1;
  color: var(--mel-amber);
  word-break: break-word;
}

.page-about .ab-plate__copy {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
}

.page-about .ab-plate__meta {
  display: grid;
  gap: 0.55rem;
  margin: 1.35rem 0 0;
  padding-top: 1.1rem;
  border-top: 1px solid var(--mel-line);
}

.page-about .ab-plate__row {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 1rem;
}

.page-about .ab-plate__row dt {
  font-size: 0.8rem;
  letter-spacing: 0.1em;
  color: var(--mel-muted);
}

.page-about .ab-plate__row dd {
  margin: 0;
  font-size: 1rem;
  letter-spacing: 0.04em;
  color: var(--mel-paper);
}

.page-about .ab-hero__media {
  position: relative;
  margin: 2rem 0 0;
  border-radius: var(--ab-radius);
  overflow: hidden;
  border: 1px solid var(--mel-line);
}

.page-about .ab-hero__media::after {
  content: "";
  position: absolute;
  inset: auto 0 0 0;
  height: 42%;
  background: linear-gradient(180deg, rgba(11, 18, 51, 0), rgba(11, 18, 51, 0.88));
  pointer-events: none;
}

.page-about .ab-hero__img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 16 / 9;
  object-fit: cover;
}

.page-about .ab-hero__cap {
  position: absolute;
  left: 1.25rem;
  bottom: 1.1rem;
  z-index: 1;
  font-size: 0.78rem;
  letter-spacing: 0.16em;
  color: var(--mel-cyan);
}

/* ---------- 02 编号口径 ---------- */
.page-about .ab-verify {
  padding-block: 3rem 0.5rem;
}

.page-about .ab-verify__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1rem;
}

.page-about .ab-verify__card {
  border-radius: var(--ab-radius-sm);
  transition: transform 220ms var(--mel-ease), border-color 220ms var(--mel-ease);
}

.page-about .ab-verify__card:hover {
  transform: translateY(-4px);
  border-color: rgba(53, 224, 224, 0.5);
}

.page-about .ab-verify__card .mel-card__meta {
  letter-spacing: 0.16em;
  font-size: 0.72rem;
  color: var(--mel-magenta);
  text-transform: uppercase;
}

/* ---------- 03 时间轴 ---------- */
.page-about .ab-timeline {
  margin-top: 3.25rem;
  padding-block: 3.25rem 3rem;
}

.page-about .ab-timeline__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1.75rem;
}

.page-about .ab-rail__label {
  margin: 0 0 0.75rem;
}

.page-about .ab-rail__list {
  display: flex;
  gap: 0.5rem;
  margin: 0;
  padding: 0 0 0.6rem;
  list-style: none;
  overflow-x: auto;
  overscroll-behavior-x: contain;
  scrollbar-width: thin;
}

.page-about .ab-rail__item {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.45rem 0.95rem;
  border-radius: 999px;
  border: 1px solid var(--mel-line);
  background: rgba(11, 18, 51, 0.5);
  color: var(--mel-paper);
  text-decoration: none;
  white-space: nowrap;
  transition: border-color 200ms var(--mel-ease), color 200ms var(--mel-ease), background 200ms var(--mel-ease);
}

.page-about .ab-rail__item:hover,
.page-about .ab-rail__item:focus-visible {
  border-color: var(--mel-cyan);
  color: var(--mel-cyan);
  background: rgba(53, 224, 224, 0.08);
}

.page-about .ab-rail__year {
  font-size: 0.82rem;
  letter-spacing: 0.08em;
  color: var(--mel-amber);
}

.page-about .ab-rail__name {
  font-size: 0.82rem;
  color: var(--mel-muted);
}

.page-about .ab-track {
  position: relative;
  min-width: 0;
}

.page-about .ab-track::before {
  content: "";
  position: absolute;
  left: 7px;
  top: 0.9rem;
  bottom: 1.6rem;
  width: 2px;
  background: linear-gradient(180deg, var(--mel-cyan), rgba(53, 224, 224, 0.05));
  border-radius: 2px;
}

.page-about .ab-node {
  position: relative;
  padding: 0 0 2.1rem 2.4rem;
  scroll-margin-top: 6.5rem;
}

.page-about .ab-node:last-child {
  padding-bottom: 0.5rem;
}

.page-about .ab-node::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.42rem;
  width: 16px;
  height: 16px;
  border-radius: 50%;
  background: var(--mel-ink);
  border: 2px solid var(--mel-cyan);
  box-shadow: 0 0 0 4px rgba(53, 224, 224, 0.08);
  transition: background 220ms var(--mel-ease), box-shadow 220ms var(--mel-ease);
}

.page-about .ab-node:target::before {
  background: var(--mel-cyan);
  box-shadow: 0 0 0 7px rgba(53, 224, 224, 0.2);
}

.page-about .ab-node__year {
  margin: 0;
  font-size: 0.86rem;
  letter-spacing: 0.16em;
  color: var(--mel-amber);
}

.page-about .ab-node__title {
  margin: 0.35rem 0 0.45rem;
  font-size: 1.18rem;
  font-weight: 500;
  line-height: 1.35;
  color: var(--mel-paper);
  transition: color 200ms var(--mel-ease);
}

.page-about .ab-node:target .ab-node__title {
  color: var(--mel-cyan);
}

.page-about .ab-node__text {
  margin: 0;
  max-width: 38ch;
  font-size: 0.98rem;
  line-height: 1.75;
  color: var(--mel-muted);
}

/* ---------- 04 门店与城市 ---------- */
.page-about .ab-cities {
  padding-block: 3.25rem 1rem;
}

.page-about .ab-cities__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1.75rem;
  align-items: center;
}

.page-about .ab-cities__body p {
  color: var(--mel-muted);
}

.page-about .ab-cities__media {
  position: relative;
  margin: 0;
  border-radius: var(--ab-radius);
  overflow: hidden;
  border: 1px solid var(--mel-line);
}

.page-about .ab-cities__img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 12 / 7;
  object-fit: cover;
}

.page-about .ab-cities__cap {
  position: absolute;
  right: 1.1rem;
  bottom: 0.95rem;
  padding: 0.3rem 0.85rem;
  border-radius: 999px;
  background: rgba(11, 18, 51, 0.78);
  border: 1px solid var(--mel-line);
  font-size: 0.75rem;
  letter-spacing: 0.14em;
  color: var(--mel-cyan);
}

.page-about .ab-citylist {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 0.9rem;
  margin: 2rem 0 0;
  padding: 0;
  list-style: none;
}

.page-about .ab-city {
  padding: 1.35rem 1.35rem 1.25rem;
  border-radius: var(--ab-radius-sm);
  border: 1px solid var(--mel-line);
  background: linear-gradient(160deg, var(--mel-card), rgba(11, 18, 51, 0.7));
  transition: transform 220ms var(--mel-ease), border-color 220ms var(--mel-ease);
}

.page-about .ab-city:hover {
  transform: translateY(-5px);
  border-color: rgba(255, 194, 75, 0.55);
}

.page-about .ab-city__idx {
  margin: 0;
  font-size: 0.78rem;
  letter-spacing: 0.2em;
  color: var(--mel-amber);
}

.page-about .ab-city__name {
  margin: 0.4rem 0 0.5rem;
  font-size: 1.28rem;
  font-weight: 500;
  color: var(--mel-paper);
}

.page-about .ab-city__text {
  margin: 0;
  font-size: 0.94rem;
  line-height: 1.72;
  color: var(--mel-muted);
}

/* ---------- 05 内容与服务 ---------- */
.page-about .ab-service {
  margin-top: 2.5rem;
  padding-block: 3.25rem;
}

.page-about .ab-svc {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 0.9rem;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .ab-svc__item {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  grid-template-rows: auto auto;
  column-gap: 1.1rem;
  row-gap: 0.35rem;
  padding: 1.3rem 1.35rem;
  border-radius: var(--ab-radius-sm);
  border: 1px solid var(--mel-line);
  background: rgba(11, 18, 51, 0.42);
}

.page-about .ab-svc__num {
  grid-row: 1 / span 2;
  align-self: start;
  margin: 0;
  font-size: 2rem;
  line-height: 1;
  letter-spacing: 0.02em;
  color: var(--mel-orange);
}

.page-about .ab-svc__title {
  margin: 0;
  font-size: 1.02rem;
  font-weight: 500;
  color: var(--mel-paper);
}

.page-about .ab-svc__text {
  margin: 0;
  font-size: 0.93rem;
  line-height: 1.72;
  color: var(--mel-muted);
}

.page-about .ab-service__foot {
  margin: 1.75rem 0 0;
  padding-top: 1.15rem;
  border-top: 1px dashed var(--mel-line);
  max-width: 46ch;
  font-size: 0.88rem;
  line-height: 1.75;
  color: var(--mel-muted);
}

/* ---------- 06 年度复核 ---------- */
.page-about .ab-review {
  padding-block: 3.25rem;
}

.page-about .ab-review__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 2rem;
}

.page-about .ab-review__lede {
  margin: 0 0 1.6rem;
  max-width: 40ch;
  font-size: 1rem;
  line-height: 1.78;
  color: var(--mel-paper);
}

.page-about .ab-checklist {
  display: grid;
  gap: 0.85rem;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .ab-checklist__item {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  column-gap: 1rem;
  padding: 1.1rem 1.2rem;
  border-radius: 20px;
  border: 1px solid rgba(255, 62, 165, 0.22);
  background: rgba(11, 18, 51, 0.4);
}

.page-about .ab-checklist__num {
  font-size: 0.82rem;
  letter-spacing: 0.14em;
  color: var(--mel-magenta);
}

.page-about .ab-checklist__title {
  margin: 0 0 0.35rem;
  font-size: 1rem;
  font-weight: 500;
  color: var(--mel-paper);
}

.page-about .ab-checklist__text {
  margin: 0;
  font-size: 0.92rem;
  line-height: 1.72;
  color: var(--mel-muted);
}

.page-about .ab-review__media {
  position: relative;
  margin: 0;
  border-radius: var(--ab-radius);
  overflow: hidden;
  border: 1px solid var(--mel-line);
  align-self: start;
}

.page-about .ab-review__img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 3 / 2;
  object-fit: cover;
}

.page-about .ab-review__cap {
  position: absolute;
  left: 1.1rem;
  bottom: 0.95rem;
  padding: 0.3rem 0.85rem;
  border-radius: 999px;
  background: rgba(74, 18, 48, 0.82);
  border: 1px solid rgba(255, 194, 75, 0.35);
  font-size: 0.75rem;
  letter-spacing: 0.14em;
  color: var(--mel-amber);
}

/* ---------- 07 关键数值 ---------- */
.page-about .ab-metrics-sec {
  padding-block: 3rem 4rem;
}

.page-about .ab-metrics {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 0.75rem;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .ab-metric {
  padding: 1.2rem 1.1rem 1.05rem;
  border-radius: 20px;
  border: 1px solid var(--mel-line);
  background: linear-gradient(165deg, var(--mel-card), rgba(11, 18, 51, 0.72));
}

.page-about .ab-metric__value {
  margin: 0;
  font-size: clamp(1.6rem, 7vw, 2.5rem);
  line-height: 1;
  letter-spacing: 0.03em;
  color: var(--mel-amber);
}

.page-about .ab-metric__label {
  margin: 0.5rem 0 0;
  font-size: 0.8rem;
  letter-spacing: 0.08em;
  color: var(--mel-muted);
}

.page-about .ab-metrics__foot {
  margin: 1.5rem 0 0;
  max-width: 52ch;
  font-size: 0.88rem;
  line-height: 1.75;
  color: var(--mel-muted);
}

.page-about .ab-next {
  margin-top: 2.5rem;
  padding-top: 1.5rem;
  border-top: 1px solid var(--mel-line);
}

.page-about .ab-next__list {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 0.6rem;
  margin: 0.9rem 0 0;
  padding: 0;
  list-style: none;
}

.page-about .ab-next__link {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 1rem;
  padding: 0.85rem 1.1rem;
  border-radius: 999px;
  border: 1px solid var(--mel-line);
  color: var(--mel-paper);
  text-decoration: none;
  transition: transform 200ms var(--mel-ease), border-color 200ms var(--mel-ease), background 200ms var(--mel-ease);
}

.page-about .ab-next__link:hover,
.page-about .ab-next__link:focus-visible {
  transform: translateX(5px);
  border-color: var(--mel-cyan);
  background: rgba(53, 224, 224, 0.07);
}

.page-about .ab-next__name {
  font-size: 0.98rem;
  font-weight: 500;
}

.page-about .ab-next__hint {
  font-size: 0.82rem;
  color: var(--mel-muted);
}

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

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

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

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

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

@media (min-width: 1000px) {
  .page-about .ab-hero {
    padding-block: 1.75rem 0;
  }

  .page-about .ab-hero__grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    align-items: end;
    gap: 3rem;
    padding-block: 2.25rem 0.75rem;
  }

  .page-about .ab-hero__media {
    margin-top: 2.5rem;
  }

  .page-about .ab-verify {
    padding-block: 4.5rem 1rem;
  }

  .page-about .ab-verify__grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 1.25rem;
  }

  .page-about .ab-timeline {
    margin-top: 5rem;
    padding-block: 4.5rem;
  }

  .page-about .ab-timeline__grid {
    grid-template-columns: minmax(0, 3fr) minmax(0, 9fr);
    gap: 3.5rem;
  }

  .page-about .ab-rail {
    position: sticky;
    top: 6.5rem;
    align-self: start;
  }

  .page-about .ab-rail__list {
    flex-direction: column;
    align-items: flex-start;
    gap: 0.45rem;
    overflow: visible;
    padding-bottom: 0;
  }

  .page-about .ab-rail__item {
    width: 100%;
    justify-content: flex-start;
  }

  .page-about .ab-node {
    padding: 0 0 2.6rem 2.9rem;
  }

  .page-about .ab-node__title {
    font-size: 1.32rem;
  }

  .page-about .ab-cities {
    padding-block: 5rem 1.5rem;
  }

  .page-about .ab-cities__grid {
    grid-template-columns: minmax(0, 6fr) minmax(0, 6fr);
    gap: 3rem;
  }

  .page-about .ab-citylist {
    margin-top: 2.75rem;
    gap: 1.25rem;
  }

  .page-about .ab-service {
    margin-top: 4rem;
    padding-block: 4.5rem;
  }

  .page-about .ab-svc {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 1.1rem;
  }

  .page-about .ab-svc__item {
    grid-template-columns: minmax(0, 1fr);
    grid-template-rows: auto auto auto;
    row-gap: 0.5rem;
  }

  .page-about .ab-svc__num {
    grid-row: auto;
    font-size: 2.4rem;
  }

  .page-about .ab-review {
    padding-block: 4.5rem;
  }

  .page-about .ab-review__grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    gap: 3.5rem;
    align-items: start;
  }

  .page-about .ab-review__media {
    position: sticky;
    top: 7rem;
  }

  .page-about .ab-metrics-sec {
    padding-block: 4.5rem 5.5rem;
  }

  .page-about .ab-metrics {
    grid-template-columns: repeat(6, minmax(0, 1fr));
  }

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

@media (prefers-reduced-motion: reduce) {
  .page-about .ab-city,
  .page-about .ab-verify__card,
  .page-about .ab-next__link {
    transition: none;
  }

  .page-about .ab-city:hover,
  .page-about .ab-verify__card:hover,
  .page-about .ab-next__link:hover {
    transform: none;
  }
}