.page-about {
  --about-rail-w: 96px;
  --about-stroke: 2px;
  background: var(--ink-900);
  color: var(--cream);
  overflow-x: hidden;
}

/* ---------- 首屏封面 ---------- */
.page-about .about-hero {
  position: relative;
  padding: calc(var(--header-h) + 40px) 0 48px;
  background:
    radial-gradient(110% 84% at 82% 4%, rgba(56, 225, 212, .16), transparent 60%),
    radial-gradient(90% 72% at 4% 98%, rgba(181, 106, 74, .15), transparent 62%),
    var(--ink-900);
  border-bottom: var(--about-stroke) solid var(--line-strong);
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background-image:
    linear-gradient(rgba(140, 151, 165, .07) 1px, transparent 1px),
    linear-gradient(90deg, rgba(140, 151, 165, .07) 1px, transparent 1px);
  background-size: 72px 72px;
  -webkit-mask-image: linear-gradient(180deg, rgba(0, 0, 0, .85), transparent 88%);
  mask-image: linear-gradient(180deg, rgba(0, 0, 0, .85), transparent 88%);
}

.page-about .about-hero .shell {
  position: relative;
  z-index: 1;
}

.page-about .about-hero__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 32px;
  margin-top: 24px;
}

.page-about .about-hero h1 {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(34px, 8.6vw, 66px);
  line-height: 1.02;
  letter-spacing: -.015em;
  margin: 14px 0 0;
  color: var(--cream);
}

.page-about .about-hero__sub {
  font-family: var(--font-serif);
  font-size: 16px;
  line-height: 1.85;
  color: var(--cream-dim);
  margin: 18px 0 0;
  max-width: 46ch;
}

.page-about .about-hero .action-row {
  margin-top: 26px;
}

.page-about .about-board {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 2px;
  background: var(--line);
  border: var(--about-stroke) solid var(--line-strong);
  box-shadow: var(--shadow-hard);
}

.page-about .about-board .stat {
  background: var(--ink-800);
  padding: 16px 14px;
  min-height: 92px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  gap: 8px;
}

.page-about .about-board .stat__value {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(22px, 5.4vw, 30px);
  line-height: 1.05;
  color: var(--cyan);
  letter-spacing: .02em;
}

.page-about .about-board .stat__unit {
  font-size: 13px;
  color: var(--stone);
  margin-left: 3px;
}

.page-about .about-board .stat__label {
  display: block;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .08em;
  color: var(--stone);
}

/* ---------- 章节骨架 ---------- */
.page-about .about-layout {
  max-width: var(--shell);
  margin: 0 auto;
  padding: 0 var(--gutter) 72px;
}

.page-about .about-rail {
  position: sticky;
  top: var(--header-h);
  z-index: 6;
  margin: 0 calc(var(--gutter) * -1) 6px;
  padding: 10px var(--gutter) 8px;
  background: var(--ink-950);
  border-bottom: var(--about-stroke) solid var(--line);
}

.page-about .about-rail__list {
  display: flex;
  gap: 8px;
  margin: 0;
  padding: 0 0 4px;
  list-style: none;
  overflow-x: auto;
  scrollbar-width: thin;
}

.page-about .about-rail__link {
  display: flex;
  align-items: center;
  gap: 7px;
  padding: 8px 12px;
  border: var(--about-stroke) solid var(--line);
  background: var(--ink-800);
  color: var(--stone);
  text-decoration: none;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .06em;
  white-space: nowrap;
  transition: color .18s var(--ease), border-color .18s var(--ease), background .18s var(--ease);
}

.page-about .about-rail__num {
  color: var(--clay);
  transition: color .18s var(--ease);
}

.page-about .about-rail__link:hover,
.page-about .about-rail__link:focus-visible {
  color: var(--cream);
  border-color: var(--line-strong);
}

.page-about .about-rail__link[aria-current="true"] {
  color: var(--cyan);
  border-color: var(--cyan);
  background: var(--cyan-wash);
}

.page-about .about-rail__link[aria-current="true"] .about-rail__num {
  color: var(--cyan);
}

.page-about .about-sec {
  padding-top: 44px;
  margin-top: 44px;
  border-top: var(--about-stroke) solid var(--line);
}

.page-about .about-body > .about-sec:first-child {
  border-top: 0;
  margin-top: 22px;
  padding-top: 8px;
}

.page-about .about-sec__head {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 10px 14px;
  margin-bottom: 22px;
}

.page-about .about-sec__num {
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: .16em;
  color: var(--clay);
}

.page-about .about-sec__title {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(24px, 5.4vw, 38px);
  line-height: 1.08;
  letter-spacing: -.01em;
  margin: 0;
  color: var(--cream);
}

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

.page-about .about-text--tight {
  margin-top: 22px;
}

.page-about .about-text p {
  font-size: 16.5px;
  line-height: 1.85;
  color: var(--cream-dim);
  margin: 0 0 16px;
}

.page-about .about-text p:last-child {
  margin-bottom: 0;
}

/* ---------- 图文分栏 ---------- */
.page-about .about-split {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 26px;
  align-items: start;
}

.page-about .about-shot {
  margin: 0;
}

.page-about .about-shot .media__frame {
  border: var(--about-stroke) solid var(--line-strong);
  box-shadow: var(--shadow-hard);
  background: var(--ink-800);
  overflow: hidden;
}

.page-about .about-shot .media__img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
}

.page-about .about-shot--wide .media__frame {
  aspect-ratio: 14 / 9;
}

.page-about .about-shot--wide .media__img {
  height: 100%;
}

.page-about .about-shot--square .media__frame {
  aspect-ratio: 1 / 1;
}

.page-about .about-shot--square .media__img {
  height: 100%;
}

.page-about .about-shot .media__caption {
  margin-top: 10px;
  font-size: 13px;
  line-height: 1.7;
  color: var(--stone);
}

/* ---------- 场景卡片 ---------- */
.page-about .about-cards {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 14px;
  margin-top: 28px;
}

.page-about .about-card {
  border: var(--about-stroke) solid var(--line-strong);
  background: var(--ink-800);
  box-shadow: var(--shadow-hard);
  padding: 20px 18px;
  transition: transform .18s var(--ease), box-shadow .18s var(--ease), border-color .18s var(--ease);
}

.page-about .about-card:hover,
.page-about .about-card:focus-within {
  transform: translateY(-4px);
  box-shadow: 7px 7px 0 rgba(0, 0, 0, .5);
  border-color: var(--cyan);
}

.page-about .about-card__num {
  display: block;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .16em;
  color: var(--clay);
  margin-bottom: 10px;
}

.page-about .about-card h3 {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 20px;
  line-height: 1.2;
  margin: 0 0 8px;
  color: var(--cream);
}

.page-about .about-card p {
  margin: 0;
  font-size: 15px;
  line-height: 1.75;
  color: var(--stone);
}

/* ---------- 团队比分板 ---------- */
.page-about .about-team {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 2px;
  margin-top: 26px;
  background: var(--line);
  border: var(--about-stroke) solid var(--line-strong);
  box-shadow: var(--shadow-hard);
}

.page-about .about-team .stat {
  background: var(--ink-800);
  padding: 18px 16px;
}

.page-about .about-team .stat--lead {
  background: var(--cyan-wash);
}

.page-about .about-team .stat__value {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(24px, 6vw, 34px);
  line-height: 1.05;
  color: var(--cyan);
}

.page-about .about-team .stat__label {
  display: block;
  margin-top: 6px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .08em;
  color: var(--stone);
}

/* ---------- 生产流程 ---------- */
.page-about .about-flow {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 2px;
  margin-top: 26px;
  background: var(--line);
  border: var(--about-stroke) solid var(--line-strong);
  box-shadow: var(--shadow-hard);
}

.page-about .about-flow__step {
  background: var(--ink-800);
  padding: 20px 16px;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.page-about .about-flow__step:nth-child(3) {
  background: var(--cyan-wash);
  border-left: 3px solid var(--cyan);
}

.page-about .about-flow__num {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .16em;
  color: var(--clay);
}

.page-about .about-flow__title {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 19px;
  margin: 0;
  color: var(--cream);
}

.page-about .about-flow__desc {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.72;
  color: var(--stone);
}

/* ---------- 中段打断块 ---------- */
.page-about .about-rupture {
  margin-top: 52px;
  padding: 32px 22px;
  border: 3px solid var(--cyan);
  background: linear-gradient(135deg, var(--ink-950) 0%, var(--ink-800) 72%);
  box-shadow: var(--shadow-cyan);
}

.page-about .about-rupture__line {
  font-family: var(--font-serif);
  font-weight: 700;
  font-size: clamp(23px, 5.8vw, 40px);
  line-height: 1.32;
  margin: 0;
  color: var(--cream);
}

.page-about .about-rupture__note {
  margin: 14px 0 0;
  font-size: 15px;
  line-height: 1.8;
  color: var(--stone);
  max-width: 54ch;
}

.page-about .about-rupture .action-row {
  margin-top: 22px;
}

/* ---------- 服务地区 ---------- */
.page-about .about-region-stat {
  display: flex;
  align-items: baseline;
  flex-wrap: wrap;
  gap: 10px;
  margin: 4px 0 18px;
  padding: 14px 16px;
  border-left: 3px solid var(--cyan);
  background: var(--cyan-wash);
}

.page-about .about-region-stat strong {
  font-family: var(--font-mono);
  font-size: 28px;
  line-height: 1;
  color: var(--cyan);
}

.page-about .about-region-stat span {
  font-size: 14px;
  line-height: 1.7;
  color: var(--cream-dim);
}

/* ---------- 发展历程轴 ---------- */
.page-about .about-timeline {
  position: relative;
  margin-top: 26px;
  padding: 22px 0 18px;
  border: var(--about-stroke) solid var(--line-strong);
  background: var(--ink-950);
  overflow: hidden;
}

.page-about .about-timeline__bg {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: .16;
  pointer-events: none;
}

.page-about .about-timeline__list {
  position: relative;
  z-index: 1;
  display: flex;
  gap: 14px;
  margin: 0;
  padding: 0 20px 8px;
  list-style: none;
  overflow-x: auto;
  scroll-snap-type: x proximity;
  scrollbar-width: thin;
}

.page-about .about-timeline__item {
  flex: 0 0 236px;
  scroll-snap-align: start;
  border: var(--about-stroke) solid var(--line-strong);
  background: rgba(20, 36, 58, .94);
  padding: 16px 15px 18px;
  box-shadow: var(--shadow-hard);
}

.page-about .about-timeline__item::before {
  content: "";
  display: block;
  width: 12px;
  height: 12px;
  margin-bottom: 14px;
  background: var(--clay);
  box-shadow: 0 0 0 2px var(--clay);
}

.page-about .about-timeline__item.is-done::before {
  background: var(--moss);
  box-shadow: 0 0 0 2px var(--moss);
}

.page-about .about-timeline__item.is-now {
  border-color: var(--cyan);
}

.page-about .about-timeline__item.is-now::before {
  background: var(--cyan);
  box-shadow: 0 0 0 2px var(--cyan);
}

.page-about .about-timeline__phase {
  display: inline-block;
  margin-bottom: 10px;
  padding: 2px 7px;
  border: 1px solid var(--clay);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .12em;
  color: var(--clay);
}

.page-about .about-timeline__item.is-now .about-timeline__phase {
  border-color: var(--cyan);
  color: var(--cyan);
}

.page-about .about-timeline__item h3 {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 19px;
  line-height: 1.2;
  margin: 0 0 8px;
  color: var(--cream);
}

.page-about .about-timeline__item p {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.72;
  color: var(--stone);
}

/* ---------- 合作生态 ---------- */
.page-about .about-partners {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 14px;
  margin-top: 26px;
}

.page-about .about-partner {
  border: var(--about-stroke) solid var(--line-strong);
  background: var(--ink-800);
  box-shadow: var(--shadow-hard);
  padding: 20px 18px;
  transition: transform .18s var(--ease), box-shadow .18s var(--ease), border-color .18s var(--ease);
}

.page-about .about-partner:hover {
  transform: translateY(-4px);
  box-shadow: 7px 7px 0 rgba(0, 0, 0, .5);
  border-color: var(--line-strong);
}

.page-about .about-partner h3 {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 20px;
  line-height: 1.2;
  margin: 0 0 8px;
  color: var(--cream);
}

.page-about .about-partner p {
  margin: 0;
  font-size: 15px;
  line-height: 1.75;
  color: var(--stone);
}

.page-about .about-partner strong {
  font-family: var(--font-mono);
  color: var(--cyan);
}

/* ---------- 收束 ---------- */
.page-about .about-outro {
  margin-top: 56px;
  padding: 30px 22px;
  border-top: 3px solid var(--cyan);
  background: var(--ink-950);
  box-shadow: var(--shadow-hard);
}

.page-about .about-outro h2 {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(22px, 5.2vw, 32px);
  line-height: 1.15;
  margin: 0 0 12px;
  color: var(--cream);
}

.page-about .about-outro p {
  margin: 0 0 20px;
  font-size: 15.5px;
  line-height: 1.8;
  color: var(--stone);
  max-width: 62ch;
}

/* ---------- 中等屏幕 ---------- */
@media (min-width: 720px) {
  .page-about .about-flow {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

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

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

  .page-about .about-cards {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 16px;
  }

  .page-about .about-timeline__item {
    flex: 0 0 268px;
  }
}

/* ---------- 宽屏：分栏与固定章节刻度 ---------- */
@media (min-width: 860px) {
  .page-about .about-hero {
    padding: calc(var(--header-h) + 56px) 0 60px;
  }

  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 1.12fr) minmax(0, .88fr);
    gap: 48px;
    align-items: end;
    margin-top: 30px;
  }

  .page-about .about-split {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, .95fr);
    gap: 38px;
  }
}

@media (min-width: 1024px) {
  .page-about .about-layout {
    display: grid;
    grid-template-columns: var(--about-rail-w) minmax(0, 1fr);
    column-gap: 48px;
    align-items: start;
  }

  .page-about .about-rail {
    position: sticky;
    top: calc(var(--header-h) + 32px);
    align-self: start;
    margin: 0;
    padding: 0;
    background: transparent;
    border-bottom: 0;
  }

  .page-about .about-rail__list {
    flex-direction: column;
    gap: 12px;
    overflow: visible;
    padding: 0;
  }

  .page-about .about-rail__link {
    flex-direction: column;
    align-items: flex-start;
    gap: 2px;
    width: 100%;
    padding: 8px 10px;
    border-color: transparent;
    background: transparent;
  }

  .page-about .about-rail__num {
    font-size: 18px;
    letter-spacing: .08em;
  }

  .page-about .about-rail__txt {
    font-size: 11px;
    letter-spacing: .04em;
  }

  .page-about .about-body > .about-sec:first-child {
    margin-top: 0;
  }

  .page-about .about-sec {
    padding-top: 52px;
    margin-top: 52px;
  }

  .page-about .about-timeline__item {
    flex: 0 0 288px;
  }

  .page-about .about-rupture {
    padding: 44px 36px;
  }

  .page-about .about-outro {
    padding: 40px 36px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-card,
  .page-about .about-partner,
  .page-about .about-rail__link {
    transition: none;
  }

  .page-about .about-card:hover,
  .page-about .about-partner:hover {
    transform: none;
  }
}