.page-about {
  --ab-cut: 18px;
  --ab-pad: 56px;
  background: var(--deep);
  color: var(--ice);
  overflow-x: clip;
}

.page-about .breadcrumb {
  padding: 18px 0 4px;
}

.page-about h2 {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(23px, 3.6vw, 34px);
  line-height: 1.16;
  letter-spacing: -0.02em;
  color: var(--ice);
  margin: 8px 0 0;
}

.page-about h3 {
  margin: 0;
}

.page-about .ab-sec-head {
  margin-bottom: 30px;
}

.page-about .ab-sec-head__lead {
  margin-top: 14px;
  max-width: 68ch;
}

/* ---------- 首屏 ---------- */
.page-about .ab-intro {
  position: relative;
  padding: 26px 0 62px;
  background: linear-gradient(158deg, var(--deep-2) 0%, var(--deep) 48%, var(--ink) 100%);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - var(--ab-cut)), 0 100%);
}

.page-about .ab-intro::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(to right, var(--line) 1px, transparent 1px),
    linear-gradient(to bottom, var(--line) 1px, transparent 1px);
  background-size: 88px 88px;
  opacity: 0.13;
  pointer-events: none;
}

.page-about .ab-intro__grid {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: 1fr;
  gap: 28px;
}

.page-about .ab-intro__aside {
  padding-left: 16px;
  border-left: 2px solid var(--amber);
}

.page-about .ab-intro__year {
  margin: 6px 0 8px;
  font-family: var(--font-mono);
  font-size: clamp(46px, 13vw, 84px);
  font-weight: 700;
  line-height: 0.95;
  letter-spacing: -0.03em;
  color: var(--ice);
  font-variant-numeric: tabular-nums;
}

.page-about .ab-intro__note {
  margin: 0;
  font-size: 0.78rem;
  font-style: italic;
  letter-spacing: 0.08em;
  color: var(--steel);
}

.page-about .ab-intro__main h1 {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(29px, 5.6vw, 56px);
  line-height: 1.08;
  letter-spacing: -0.025em;
  margin: 10px 0 18px;
  color: var(--ice);
}

.page-about .ab-intro__lead {
  max-width: 64ch;
  color: var(--ice);
  opacity: 0.88;
}

.page-about .ab-intro__stats {
  display: flex;
  flex-wrap: wrap;
  gap: 16px 44px;
  list-style: none;
  margin: 28px 0 0;
  padding: 22px 0 0;
  border-top: 1px solid var(--line);
}

.page-about .ab-intro__stats li {
  display: flex;
  flex-direction: column;
  gap: 5px;
}

.page-about .ab-intro__stats .num {
  font-family: var(--font-mono);
  font-size: clamp(24px, 3.6vw, 38px);
  font-weight: 700;
  line-height: 1;
  letter-spacing: -0.02em;
  font-variant-numeric: tabular-nums;
}

.page-about .ab-intro__stats li > span:last-child {
  font-size: 0.76rem;
  font-style: italic;
  letter-spacing: 0.08em;
  color: var(--steel);
}

/* ---------- 起点 ---------- */
.page-about .ab-origin {
  padding: var(--ab-pad) 0 48px;
  border-top: 1px solid var(--line);
}

.page-about .ab-origin__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 22px;
}

.page-about .ab-origin__body {
  max-width: 66ch;
}

.page-about .ab-origin__body p + p {
  margin-top: 16px;
}

/* ---------- 数据生产 ---------- */
.page-about .ab-data {
  padding: var(--ab-pad) 0;
  border-top: 1px solid var(--line);
  background: linear-gradient(200deg, var(--deep-2) 0%, var(--deep) 72%);
}

.page-about .ab-data__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 32px;
}

.page-about .ab-flow {
  list-style: none;
  margin: 26px 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: 1fr;
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
}

.page-about .ab-flow__item {
  background: var(--deep);
  padding: 18px 18px 20px;
  display: flex;
  flex-direction: column;
  gap: 6px;
  transition: background 0.18s ease;
}

.page-about .ab-flow__item:hover {
  background: var(--slate);
}

.page-about .ab-flow__no {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  letter-spacing: 0.08em;
  color: var(--cyan);
}

.page-about .ab-flow__name {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.02rem;
  letter-spacing: -0.01em;
  color: var(--ice);
}

.page-about .ab-flow__text {
  margin: 0;
  font-size: 0.86rem;
  line-height: 1.75;
  color: var(--steel);
}

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

.page-about .ab-data__figure img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  border: 1px solid var(--line);
  background: var(--deep-2);
  object-fit: cover;
}

/* ---------- 12 个栏目 ---------- */
.page-about .ab-index-sec {
  padding: var(--ab-pad) 0;
  border-top: 1px solid var(--line);
}

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

.page-about .ab-index__item {
  background: var(--deep);
  padding: 16px 18px 18px;
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 3px 14px;
  align-items: baseline;
  transition: background 0.18s ease;
}

.page-about .ab-index__item:hover {
  background: var(--slate);
}

.page-about .ab-index__no {
  font-family: var(--font-mono);
  font-size: 0.76rem;
  letter-spacing: 0.06em;
  color: var(--amber);
  font-variant-numeric: tabular-nums;
}

.page-about .ab-index__name {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1rem;
  letter-spacing: -0.01em;
  color: var(--ice);
}

.page-about .ab-index__item:hover .ab-index__name {
  color: var(--cyan);
}

.page-about .ab-index__desc {
  grid-column: 1 / -1;
  margin: 4px 0 0;
  font-size: 0.85rem;
  line-height: 1.7;
  color: var(--steel);
}

/* ---------- 团队 ---------- */
.page-about .ab-team {
  padding: var(--ab-pad) 0;
  border-top: 1px solid var(--line);
}

.page-about .ab-bars {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: 1fr;
  gap: 28px;
}

.page-about .ab-bar__head {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 12px;
  margin: 0 0 10px;
}

.page-about .ab-bar__name {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1rem;
  letter-spacing: -0.01em;
  color: var(--ice);
}

.page-about .ab-bar__num {
  font-family: var(--font-mono);
  font-size: 1.65rem;
  font-weight: 700;
  line-height: 1;
  font-variant-numeric: tabular-nums;
}

.page-about .ab-bar__track {
  position: relative;
  height: 6px;
  background: var(--slate);
  overflow: hidden;
}

.page-about .ab-bar__fill {
  display: block;
  height: 100%;
  width: var(--pct, 0%);
  background: var(--cyan);
  transition: width 0.4s ease, filter 0.18s ease;
}

.page-about .ab-bar--amber .ab-bar__fill {
  background: var(--amber);
}

.page-about .ab-bar:hover .ab-bar__fill {
  filter: brightness(1.18);
}

.page-about .ab-bar__note {
  margin: 10px 0 0;
  font-size: 0.85rem;
  line-height: 1.72;
  color: var(--steel);
}

/* ---------- 中段横幅 ---------- */
.page-about .ab-banner {
  padding: 8px 0 52px;
}

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

.page-about .ab-banner__figure img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  max-height: 440px;
  object-fit: cover;
  border: 1px solid var(--line);
  background: var(--deep-2);
}

/* ---------- 覆盖与规模 ---------- */
.page-about .ab-reach {
  padding: 0 0 var(--ab-pad);
}

.page-about .ab-reach__grid {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
}

.page-about .ab-reach__cell {
  background: linear-gradient(180deg, var(--deep-2) 0%, var(--deep) 100%);
  padding: 20px 16px 22px;
  display: flex;
  flex-direction: column;
  gap: 8px;
  transition: background 0.18s ease;
}

.page-about .ab-reach__cell:hover {
  background: var(--slate);
}

.page-about .ab-reach__num {
  font-family: var(--font-mono);
  font-size: clamp(21px, 3vw, 30px);
  font-weight: 700;
  line-height: 1;
  letter-spacing: -0.02em;
  font-variant-numeric: tabular-nums;
}

.page-about .ab-reach__label {
  font-size: 0.76rem;
  font-style: italic;
  letter-spacing: 0.08em;
  color: var(--steel);
}

.page-about .ab-reach__award {
  margin: 22px 0 0;
  padding-left: 14px;
  border-left: 2px solid var(--amber);
  font-size: 0.88rem;
  line-height: 1.7;
  color: var(--ice);
  opacity: 0.85;
}

/* ---------- 里程碑 ---------- */
.page-about .ab-mile {
  position: relative;
  padding: var(--ab-pad) 0 calc(var(--ab-pad) + 8px);
  border-top: 1px solid var(--line);
  background: var(--ink);
  overflow: hidden;
}

.page-about .ab-mile__bg {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: 0.16;
  pointer-events: none;
}

.page-about .ab-mile__inner {
  position: relative;
  z-index: 1;
}

.page-about .ab-tl {
  list-style: none;
  margin: 0;
  padding: 0 0 0 26px;
  border-left: 1px solid var(--line);
}

.page-about .ab-tl__item {
  position: relative;
  padding-bottom: 34px;
}

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

.page-about .ab-tl__item::before {
  content: "";
  position: absolute;
  left: -32px;
  top: 9px;
  width: 11px;
  height: 11px;
  background: var(--amber);
  transform: rotate(45deg);
  box-shadow: 0 0 0 4px rgba(255, 162, 58, 0.13);
  transition: background 0.18s ease, box-shadow 0.18s ease;
}

.page-about .ab-tl__item:hover::before {
  background: var(--cyan);
  box-shadow: 0 0 0 4px rgba(55, 242, 220, 0.16);
}

.page-about .ab-tl__year {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(26px, 4.4vw, 40px);
  font-weight: 700;
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--amber);
  margin-bottom: 10px;
  font-variant-numeric: tabular-nums;
}

.page-about .ab-tl__body {
  max-width: 60ch;
  transition: transform 0.18s ease;
}

.page-about .ab-tl__item:hover .ab-tl__body {
  transform: translateX(4px);
}

.page-about .ab-tl__body h3 {
  font-family: var(--font-serif);
  font-weight: 600;
  font-size: 1.1rem;
  line-height: 1.4;
  margin-bottom: 6px;
  color: var(--ice);
}

.page-about .ab-tl__body p {
  margin: 0;
  font-size: 0.92rem;
  line-height: 1.78;
  color: var(--steel);
}

/* ---------- 做事方式 + 行动 ---------- */
.page-about .ab-ethos {
  padding: var(--ab-pad) 0 calc(var(--ab-pad) + 8px);
  border-top: 1px solid var(--line);
}

.page-about .ab-ethos__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 28px;
}

.page-about .ab-ethos__item {
  padding-top: 16px;
  border-top: 2px solid var(--line);
  transition: border-color 0.18s ease;
}

.page-about .ab-ethos__item:hover {
  border-top-color: var(--cyan);
}

.page-about .ab-ethos__no {
  display: block;
  font-family: var(--font-mono);
  font-size: 0.78rem;
  letter-spacing: 0.08em;
  color: var(--amber);
  margin-bottom: 10px;
}

.page-about .ab-ethos__item h3 {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.05rem;
  letter-spacing: -0.01em;
  color: var(--ice);
  margin-bottom: 8px;
}

.page-about .ab-ethos__item p {
  margin: 0;
  font-size: 0.88rem;
  line-height: 1.78;
  color: var(--steel);
}

.page-about .ab-cta {
  margin-top: 46px;
  padding: 28px 22px 30px;
  border: 1px solid var(--line);
  border-left: 3px solid var(--cyan);
  background: linear-gradient(120deg, var(--deep-2) 0%, var(--deep) 100%);
}

.page-about .ab-cta__title {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(19px, 2.6vw, 24px);
  letter-spacing: -0.02em;
  color: var(--ice);
  margin-bottom: 10px;
}

.page-about .ab-cta__text {
  margin: 0;
  max-width: 64ch;
  font-size: 0.9rem;
  line-height: 1.78;
  color: var(--steel);
}

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

.page-about a:focus-visible,
.page-about .btn:focus-visible {
  outline: 2px solid var(--cyan);
  outline-offset: 3px;
}

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

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

@media (min-width: 900px) {
  .page-about {
    --ab-pad: 76px;
    --ab-cut: 26px;
  }

  .page-about .ab-intro {
    padding: 34px 0 88px;
  }

  .page-about .ab-intro__grid {
    grid-template-columns: minmax(210px, 4fr) minmax(0, 8fr);
    gap: 64px;
    align-items: start;
  }

  .page-about .ab-origin__grid {
    grid-template-columns: minmax(0, 5fr) minmax(0, 7fr);
    gap: 72px;
  }

  .page-about .ab-data__grid {
    grid-template-columns: minmax(0, 6fr) minmax(0, 5fr);
    gap: 56px;
    align-items: center;
  }

  .page-about .ab-bars {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 34px 56px;
  }

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

  .page-about .ab-ethos__grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 44px;
  }

  .page-about .ab-cta {
    padding: 36px 34px 38px;
  }
}

@media (min-width: 1024px) {
  .page-about .ab-index {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .ab-bar__fill,
  .page-about .ab-tl__body,
  .page-about .ab-flow__item,
  .page-about .ab-index__item,
  .page-about .ab-reach__cell,
  .page-about .ab-ethos__item {
    transition: none;
  }

  .page-about .ab-tl__item:hover .ab-tl__body {
    transform: none;
  }
}

.page-about {
  --pct: 1rem;
}