.page-about {
  --ab-rail: 108px;
  --ab-gap: 30px;
  --ab-pad: 52px;
  --ab-blue-2: #3D7BFF;
  --ab-blue-3: #6B9CFF;
  --ab-cyan-2: #5FEBDA;
}

/* ---------- 首屏 ---------- */
.page-about .ab-hero {
  position: relative;
  background: var(--ink);
  color: var(--white);
  padding: 26px 0 46px;
}
.page-about .ab-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(255, 255, 255, 0.055) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 255, 255, 0.055) 1px, transparent 1px);
  background-size: 52px 52px;
  pointer-events: none;
}
.page-about .ab-hero > .container {
  position: relative;
  z-index: 1;
}
.page-about .ab-hero .breadcrumbs__link,
.page-about .ab-hero .breadcrumbs__current {
  color: var(--steel);
  text-decoration: none;
}
.page-about .ab-hero .breadcrumbs__link:hover {
  color: var(--lime);
}
.page-about .ab-hero__eyebrow {
  color: var(--lime);
  margin: 20px 0 0;
}
.page-about .ab-hero__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 30px;
  margin-top: 10px;
}
.page-about .ab-hero__glyph {
  margin: 6px 0 -6px;
  font-family: var(--font-display);
  font-size: clamp(3.4rem, 15vw, 8.4rem);
  line-height: 0.82;
  letter-spacing: -0.04em;
  color: rgba(0, 87, 255, 0.22);
  -webkit-text-stroke: 2px rgba(61, 123, 255, 0.85);
}
.page-about .ab-hero__title {
  margin: 0 0 16px;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(2rem, 7.4vw, 4rem);
  line-height: 1;
  letter-spacing: -0.02em;
}
.page-about .ab-hero__lede {
  max-width: 34em;
  margin: 0;
  color: #C9D6F5;
  font-size: 1.02rem;
  line-height: 1.8;
}
.page-about .ab-hero__actions {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 16px;
  margin-top: 26px;
}
.page-about .ab-hero .link-arrow {
  color: var(--white);
}
.page-about .ab-hero__panel {
  background: rgba(255, 255, 255, 0.06);
  border: 2px solid rgba(168, 182, 217, 0.45);
  border-radius: var(--radius);
  padding: 18px 18px 14px;
  color: var(--white);
}
.page-about .ab-hero__panel .status-panel__head {
  color: var(--lime);
  font-family: var(--font-mono);
  font-size: 0.82rem;
  letter-spacing: 0.08em;
  margin: 0 0 12px;
  text-transform: uppercase;
}
.page-about .ab-hero__panel .status-panel__row {
  display: flex;
  justify-content: space-between;
  gap: 14px;
  padding: 9px 0;
  border-bottom: 1px dashed rgba(168, 182, 217, 0.3);
}
.page-about .ab-hero__panel .status-panel__row:last-child {
  border-bottom: 0;
}
.page-about .ab-hero__panel .status-panel__label {
  color: var(--steel);
  font-size: 0.86rem;
}
.page-about .ab-hero__panel .status-panel__value {
  font-family: var(--font-mono);
  font-size: 0.95rem;
  color: var(--white);
}

/* ---------- 章节骨架 ---------- */
.page-about .ab-chapter {
  padding: var(--ab-pad) 0;
  background: var(--white);
}
.page-about .ab-chapter--ice {
  background: var(--ice);
}
.page-about .ab-chapter--dark {
  background: var(--ink);
  color: var(--white);
}
.page-about .ab-chapter__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 18px;
}
.page-about .ab-chapter__rail {
  display: flex;
  align-items: baseline;
  gap: 12px;
  padding-bottom: 10px;
  border-bottom: 3px solid var(--blue);
}
.page-about .ab-chapter--dark .ab-chapter__rail {
  border-bottom-color: var(--lime);
}
.page-about .ab-chapter__rail .chapter__num {
  font-family: var(--font-display);
  font-size: 2.1rem;
  line-height: 1;
  color: var(--blue);
  letter-spacing: -0.02em;
}
.page-about .ab-chapter--dark .ab-chapter__rail .chapter__num {
  color: var(--lime);
}
.page-about .ab-chapter__rail-label {
  font-size: 0.8rem;
  letter-spacing: 0.28em;
  color: var(--muted);
}
.page-about .ab-chapter--dark .ab-chapter__rail-label {
  color: var(--steel);
}
.page-about .chapter__title {
  margin: 0 0 12px;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(1.5rem, 4.4vw, 2.4rem);
  line-height: 1.08;
  letter-spacing: -0.02em;
}
.page-about .chapter__lede {
  max-width: 40em;
  margin: 0 0 8px;
  font-size: 1.02rem;
  line-height: 1.8;
  color: var(--muted);
}
.page-about .ab-chapter--dark .chapter__lede {
  color: var(--steel);
}

/* ---------- 年份刻度 ---------- */
.page-about .ab-ticks {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 14px;
  list-style: none;
  margin: 0;
  padding: 0;
}
.page-about .ab-ticks__item {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  font-family: var(--font-mono);
  font-size: 0.82rem;
  color: var(--steel);
}
.page-about .ab-ticks__dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--steel);
  flex: none;
}
.page-about .ab-ticks__item.is-current {
  color: var(--ink);
  font-weight: 700;
}
.page-about .ab-ticks__item.is-current .ab-ticks__dot {
  background: var(--lime);
  box-shadow: 0 0 0 3px rgba(180, 255, 57, 0.3);
}

/* ---------- 时间线 ---------- */
.page-about .tl {
  margin-top: 26px;
}
.page-about .tl__item {
  position: relative;
  padding: 0 0 0 20px;
  margin: 0 0 26px;
  border-left: 3px solid var(--ink);
}
.page-about .tl__item::before {
  content: "";
  position: absolute;
  left: -11px;
  top: 5px;
  width: 12px;
  height: 12px;
  border: 3px solid var(--blue);
  border-radius: 50%;
  background: var(--white);
}
.page-about .tl__item:last-child {
  margin-bottom: 0;
}
.page-about .tl__year {
  margin: 0 0 4px;
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: clamp(1.4rem, 4.6vw, 2rem);
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--blue);
}
.page-about .tl__title {
  margin: 0 0 8px;
  font-size: 1.16rem;
  line-height: 1.4;
}
.page-about .tl__text {
  margin: 0;
  max-width: 46em;
  font-size: 0.99rem;
  line-height: 1.8;
  color: var(--muted);
}
.page-about .tl__tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 12px 0 0;
  padding: 0;
  list-style: none;
}

/* ---------- 图片框 ---------- */
.page-about .ab-figure {
  border: var(--bd) solid var(--ink);
  border-radius: var(--radius);
  box-shadow: var(--shadow-hard);
  background: var(--ice);
  margin: 0 0 28px;
}
.page-about .ab-figure img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
}
.page-about .ab-figure .media-frame__caption {
  padding: 10px 14px;
  font-size: 0.84rem;
  line-height: 1.6;
  color: var(--muted);
  border-top: 2px solid var(--ink);
  background: var(--white);
}
.page-about .ab-figure--tight {
  margin-bottom: 0;
}
.page-about .ab-figure--wide {
  margin: 30px 0 0;
}

/* ---------- 团队条带 ---------- */
.page-about .ab-split {
  display: grid;
  grid-template-columns: 1fr;
  gap: 26px;
  margin-top: 22px;
}
.page-about .band {
  border: var(--bd) solid var(--ink);
  border-radius: var(--radius);
  box-shadow: var(--shadow-hard);
  background: var(--white);
}
.page-about .band__bar {
  display: flex;
  height: 62px;
  border-bottom: var(--bd) solid var(--ink);
}
.page-about .band__seg {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
  border-right: 2px solid var(--ink);
  color: var(--white);
  font-family: var(--font-mono);
  font-size: 0.82rem;
  font-weight: 700;
  cursor: help;
  transition: filter var(--t-fast) var(--ease);
  outline-offset: -3px;
}
.page-about .band__seg:last-child {
  border-right: 0;
}
.page-about .band__seg:hover,
.page-about .band__seg:focus-visible {
  filter: brightness(1.14);
}
.page-about .band__seg--product { flex: 22 1 0; background: var(--blue); }
.page-about .band__seg--content { flex: 21 1 0; background: var(--ab-blue-2); }
.page-about .band__seg--data { flex: 18 1 0; background: var(--ab-blue-3); }
.page-about .band__seg--tech { flex: 16 1 0; background: var(--cyan); color: var(--ink); }
.page-about .band__seg--support { flex: 10 1 0; background: var(--ab-cyan-2); color: var(--ink); }
.page-about .band__tip {
  position: absolute;
  left: 50%;
  bottom: calc(100% + 12px);
  z-index: 4;
  width: max-content;
  max-width: 220px;
  padding: 9px 11px;
  transform: translate(-50%, 6px);
  background: var(--ink);
  color: var(--white);
  font-family: var(--font-body);
  font-size: 0.78rem;
  font-weight: 400;
  line-height: 1.55;
  border-radius: var(--radius);
  opacity: 0;
  visibility: hidden;
  transition: opacity var(--t-fast) var(--ease), transform var(--t-fast) var(--ease);
}
.page-about .band__seg:hover .band__tip,
.page-about .band__seg:focus-visible .band__tip {
  opacity: 1;
  visibility: visible;
  transform: translate(-50%, 0);
}
.page-about .band__legend {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 8px 16px;
  list-style: none;
  margin: 0;
  padding: 14px 16px;
}
.page-about .band__legend-item {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.88rem;
  color: var(--muted);
}
.page-about .band__legend-item .dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  flex: none;
}

.page-about .ab-callout {
  margin-top: 22px;
}
.page-about .ab-callout__title {
  margin: 0 0 6px;
  font-weight: 700;
  font-size: 1.02rem;
}
.page-about .ab-callout p {
  margin: 0;
  line-height: 1.8;
}

/* ---------- 数据统计 ---------- */
.page-about .ab-stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 18px;
  margin-top: 24px;
}
.page-about .ab-stat {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: 16px 14px;
  background: var(--white);
  border: var(--bd) solid var(--ink);
  border-radius: var(--radius);
  box-shadow: 3px 4px 0 var(--ink);
}
.page-about .ab-stat .stat__num {
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: clamp(1.7rem, 5vw, 2.3rem);
  line-height: 1;
  color: var(--ink);
  box-shadow: inset 0 -6px 0 rgba(180, 255, 57, 0.85);
  align-self: flex-start;
  padding-right: 4px;
}
.page-about .ab-stat .stat__label {
  font-size: 0.88rem;
  line-height: 1.6;
  color: var(--muted);
}

/* ---------- 更新节奏 ---------- */
.page-about .ab-cadence {
  margin-top: 30px;
  padding: 22px 20px;
  background: var(--white);
  border: var(--bd) solid var(--ink);
  border-radius: var(--radius);
  box-shadow: var(--shadow-hard);
}
.page-about .ab-cadence__title {
  margin: 0 0 14px;
  font-size: 1.14rem;
}
.page-about .ab-cadence__list {
  list-style: none;
  margin: 0;
  padding: 0;
}
.page-about .ab-cadence__item {
  display: grid;
  grid-template-columns: 1fr;
  gap: 4px;
  padding: 13px 0;
  border-top: 2px solid var(--ice);
}
.page-about .ab-cadence__item:first-child {
  border-top: 0;
  padding-top: 0;
}
.page-about .ab-cadence__key {
  font-family: var(--font-mono);
  font-size: 0.84rem;
  letter-spacing: 0.06em;
  color: var(--blue);
}
.page-about .ab-cadence__val {
  font-size: 0.97rem;
  line-height: 1.75;
  color: var(--muted);
}
.page-about .ab-cadence__note {
  margin: 16px 0 0;
  padding-top: 14px;
  border-top: 2px solid var(--ink);
  font-size: 0.92rem;
  line-height: 1.75;
  color: var(--muted);
}

/* ---------- 理念三条 ---------- */
.page-about .ab-principles {
  list-style: none;
  margin: 24px 0 0;
  padding: 0;
  display: grid;
  gap: 20px;
}
.page-about .ab-principles__item {
  position: relative;
  padding: 20px 18px 20px 22px;
  border-left: 4px solid var(--blue);
  background: linear-gradient(100deg, var(--ice) 0%, rgba(232, 240, 255, 0) 88%);
}
.page-about .ab-principles__item::after {
  content: "";
  position: absolute;
  right: 0;
  bottom: 0;
  width: 46%;
  height: 3px;
  background: linear-gradient(90deg, var(--blue), var(--lime));
}
.page-about .ab-principles__idx {
  display: block;
  font-family: var(--font-mono);
  font-size: 0.8rem;
  letter-spacing: 0.2em;
  color: var(--blue);
  margin-bottom: 6px;
}
.page-about .ab-principles__title {
  margin: 0 0 8px;
  font-size: 1.2rem;
  font-family: var(--font-display);
  font-weight: 900;
  letter-spacing: -0.01em;
}
.page-about .ab-principles__item p {
  margin: 0;
  max-width: 42em;
  font-size: 0.98rem;
  line-height: 1.8;
  color: var(--muted);
}

.page-about .ab-next {
  display: flex;
  flex-wrap: wrap;
  gap: 10px 28px;
  margin-top: 30px;
  padding-top: 18px;
  border-top: 2px solid var(--ink);
}
.page-about .ab-next--end {
  margin-top: 34px;
}

/* ---------- 地域区块 ---------- */
.page-about .ab-region {
  position: relative;
  overflow: hidden;
  margin-top: 24px;
  padding: 26px 20px;
  background: var(--navy);
  border: 2px solid rgba(168, 182, 217, 0.35);
  border-radius: var(--radius);
}
.page-about .ab-region__art {
  position: absolute;
  right: -14px;
  bottom: -6px;
  width: 240px;
  height: auto;
  color: var(--lime);
  opacity: 0.16;
  pointer-events: none;
}
.page-about .ab-region__grid {
  position: relative;
  display: grid;
  grid-template-columns: 1fr;
  gap: 20px;
}
.page-about .ab-region__block {
  padding-left: 14px;
  border-left: 3px solid var(--lime);
}
.page-about .ab-region__key {
  margin: 0 0 6px;
  font-family: var(--font-mono);
  font-size: 0.8rem;
  letter-spacing: 0.14em;
  color: var(--lime);
}
.page-about .ab-region__val {
  margin: 0 0 6px;
  font-size: 1rem;
  font-weight: 700;
  line-height: 1.6;
  color: var(--white);
  word-break: break-word;
}
.page-about .ab-region__note {
  margin: 0;
  max-width: 34em;
  font-size: 0.86rem;
  line-height: 1.7;
  color: var(--steel);
}
.page-about .ab-chapter--dark .link-arrow {
  color: var(--lime);
}

/* ---------- 荣誉卡 ---------- */
.page-about .honor {
  display: grid;
  grid-template-columns: 1fr;
  gap: 20px;
  margin-top: 24px;
}
.page-about .honor__card {
  padding: 20px 18px;
  background: var(--white);
  border: 3px solid var(--ink);
  border-radius: var(--radius);
  box-shadow: 4px 6px 0 var(--ink);
  transition: transform var(--t-base) var(--ease), box-shadow var(--t-base) var(--ease);
}
.page-about .honor__card:hover,
.page-about .honor__card:focus-visible {
  transform: translate(-2px, -2px);
  box-shadow: var(--shadow-lift);
}
.page-about .honor__range {
  margin: 0 0 10px;
  display: inline-block;
  padding: 3px 9px;
  font-family: var(--font-mono);
  font-size: 0.8rem;
  letter-spacing: 0.06em;
  color: var(--ink);
  background: var(--lime);
  border: 2px solid var(--ink);
  border-radius: var(--radius);
}
.page-about .honor__title {
  margin: 0 0 10px;
  font-size: 1.08rem;
  line-height: 1.45;
}
.page-about .honor__text {
  margin: 0;
  font-size: 0.94rem;
  line-height: 1.78;
  color: var(--muted);
}

/* ---------- 桌面端 ---------- */
@media (min-width: 768px) {
  .page-about .ab-hero {
    padding: 30px 0 64px;
  }
  .page-about .ab-hero__grid {
    grid-template-columns: minmax(0, 2.05fr) minmax(0, 1fr);
    gap: 40px;
    align-items: start;
  }
  .page-about .ab-stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
  .page-about .ab-cadence__item {
    grid-template-columns: 148px minmax(0, 1fr);
    gap: 18px;
    align-items: baseline;
  }
  .page-about .honor {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
  .page-about .band__legend {
    grid-template-columns: repeat(5, minmax(0, 1fr));
  }
  .page-about .ab-region__grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 24px 34px;
  }
  .page-about .ab-principles__item {
    padding: 22px 24px 22px 26px;
  }
}

@media (min-width: 992px) {
  .page-about {
    --ab-pad: 68px;
  }
  .page-about .ab-chapter__grid {
    grid-template-columns: var(--ab-rail) minmax(0, 1fr);
    gap: var(--ab-gap);
  }
  .page-about .ab-chapter__rail {
    position: sticky;
    top: 84px;
    align-self: start;
    flex-direction: column;
    align-items: flex-start;
    gap: 8px;
    padding-bottom: 14px;
    border-bottom: 0;
    border-left: 3px solid var(--blue);
    padding-left: 14px;
  }
  .page-about .ab-chapter--dark .ab-chapter__rail {
    border-left-color: var(--lime);
  }
  .page-about .ab-chapter__rail .chapter__num {
    font-size: 2.8rem;
  }
  .page-about .ab-chapter__rail-label {
    font-size: 0.74rem;
  }
  .page-about .ab-ticks {
    flex-direction: column;
    gap: 16px;
    margin-top: 22px;
    position: relative;
    padding-left: 14px;
  }
  .page-about .ab-ticks::before {
    content: "";
    position: absolute;
    left: 3px;
    top: 4px;
    bottom: 4px;
    width: 2px;
    background: var(--ice);
  }
  .page-about .ab-ticks__item {
    position: relative;
  }
  .page-about .ab-ticks__item .ab-ticks__dot {
    position: absolute;
    left: -14px;
  }
  .page-about .ab-split {
    grid-template-columns: minmax(0, 1.65fr) minmax(0, 1fr);
    gap: 34px;
    align-items: start;
  }
  .page-about .ab-figure {
    margin-bottom: 32px;
  }
  .page-about .ab-region {
    padding: 34px 32px;
  }
  .page-about .ab-region__grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    max-width: 82%;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .honor__card,
  .page-about .band__seg,
  .page-about .band__tip {
    transition: none;
  }
  .page-about .honor__card:hover,
  .page-about .honor__card:focus-visible {
    transform: none;
  }
}