.page-about {
  --about-index-w: 15.5rem;
  --about-gap: clamp(1.5rem, 4vw, 3.5rem);
  --about-frame-border: var(--bw) solid var(--c-line);
  display: block;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  overflow: hidden;
  border-bottom: var(--bw) solid var(--c-line);
  background:
    radial-gradient(circle at 84% 10%, rgba(46, 230, 168, 0.13), transparent 46%),
    radial-gradient(circle at 6% 90%, rgba(255, 107, 26, 0.12), transparent 44%),
    var(--c-void);
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(36, 56, 74, 0.55) 1px, transparent 1px),
    linear-gradient(90deg, rgba(36, 56, 74, 0.55) 1px, transparent 1px);
  background-size: 64px 64px;
  -webkit-mask-image: linear-gradient(180deg, rgba(0, 0, 0, 0.95), transparent 76%);
  mask-image: linear-gradient(180deg, rgba(0, 0, 0, 0.95), transparent 76%);
  pointer-events: none;
}

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

.page-about .about-hero .breadcrumb {
  margin-bottom: 1.5rem;
}

.page-about .about-hero__title {
  font-family: var(--font-head);
  font-weight: 900;
  font-size: clamp(2rem, 5.4vw, 3.4rem);
  line-height: 1.14;
  letter-spacing: -0.02em;
  color: var(--c-text);
  max-width: 22ch;
  margin: 0.6rem 0 1.15rem;
}

.page-about .about-hero__lead {
  font-size: clamp(1rem, 1.7vw, 1.125rem);
  line-height: 1.85;
  color: var(--c-muted);
  max-width: 70ch;
  margin: 0;
}

.page-about .about-hero__kpis {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1.25rem 1rem;
  margin-top: clamp(2rem, 4vw, 3rem);
  padding-top: 1.5rem;
  border-top: var(--bw) solid var(--c-line);
}

.page-about .about-hero__kpis .kpi {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 0.2rem 0.4rem;
  padding-left: 0.9rem;
  border-left: 3px solid var(--c-green);
  min-width: 0;
}

.page-about .about-hero__kpis .kpi__value {
  font-family: var(--font-num);
  font-weight: 700;
  font-size: clamp(1.5rem, 3.4vw, 2.25rem);
  line-height: 1;
  color: var(--c-green);
  letter-spacing: -0.01em;
}

.page-about .about-hero__kpis .kpi__unit {
  font-family: var(--font-num);
  font-size: 0.82rem;
  color: var(--c-cyan);
}

.page-about .about-hero__kpis .kpi__label {
  flex: 1 0 100%;
  margin: 0.35rem 0 0;
  font-size: 0.8rem;
  line-height: 1.6;
  color: var(--c-muted);
  letter-spacing: 0.03em;
}

/* ---------- 主体：索引 + 叙事 ---------- */
.page-about .about-body__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: var(--about-gap);
}

.page-about .about-index {
  align-self: start;
  border-left: var(--bw) solid var(--c-green);
  padding-left: 1rem;
}

.page-about .about-index__label {
  margin: 0 0 0.75rem;
  font-family: var(--font-num);
  font-size: 0.72rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--c-cyan);
}

.page-about .about-index__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 0.15rem;
}

.page-about .about-index__link {
  display: flex;
  align-items: baseline;
  gap: 0.6rem;
  padding: 0.42rem 0.2rem;
  font-size: 0.9rem;
  color: var(--c-muted);
  text-decoration: none;
  border-bottom: 1px solid rgba(36, 56, 74, 0.6);
  transition: color 0.16s var(--ease), padding-left 0.16s var(--ease);
}

.page-about .about-index__link:hover,
.page-about .about-index__link:focus-visible {
  color: var(--c-text);
  padding-left: 0.5rem;
}

.page-about .about-index__num {
  font-family: var(--font-num);
  font-size: 0.72rem;
  color: var(--c-orange);
  flex: none;
}

.page-about .about-index__coord {
  margin: 1rem 0 0;
  font-family: var(--font-num);
  font-size: 0.7rem;
  color: var(--c-line);
  letter-spacing: 0.1em;
}

.page-about .about-flow > * + * {
  margin-top: clamp(2.75rem, 6vw, 4.5rem);
}

/* ---------- 叙事区块 ---------- */
.page-about .about-block {
  scroll-margin-top: 6rem;
}

.page-about .about-block__head {
  border-top: var(--bw) solid var(--c-line);
  padding-top: 1.1rem;
  margin-bottom: 1.35rem;
}

.page-about .about-block__head .idx {
  margin: 0 0 0.5rem;
  font-family: var(--font-num);
  font-size: 0.76rem;
  letter-spacing: 0.18em;
  color: var(--c-orange);
}

.page-about .about-block__title {
  font-family: var(--font-head);
  font-weight: 800;
  font-size: clamp(1.5rem, 3vw, 1.95rem);
  line-height: 1.28;
  letter-spacing: -0.015em;
  color: var(--c-text);
  margin: 0;
}

.page-about .about-block__lead {
  margin: 0.7rem 0 0;
  color: var(--c-muted);
  font-size: 0.98rem;
  line-height: 1.8;
  max-width: 62ch;
}

.page-about .about-block__prose p {
  margin: 0 0 1.05rem;
  font-size: 1rem;
  line-height: 1.9;
  color: var(--c-text);
  max-width: 70ch;
}

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

/* ---------- 航拍图带 ---------- */
.page-about .about-band {
  margin: 0;
}

.page-about .about-band__frame {
  position: relative;
  overflow: hidden;
  border: var(--about-frame-border);
  box-shadow: var(--shadow-hard-lg);
  background: var(--c-panel);
}

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

.page-about .about-band .media__tag {
  position: absolute;
  left: 0;
  bottom: 0;
  padding: 0.35rem 0.7rem;
  background: var(--c-green);
  color: var(--c-ink);
  font-family: var(--font-num);
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.08em;
}

.page-about .about-band .media__cap {
  margin: 0.7rem 0 0;
  font-size: 0.8rem;
  color: var(--c-muted);
}

/* ---------- 时间轴 ---------- */
.page-about .about-timeline {
  position: relative;
}

.page-about .about-timeline__track {
  list-style: none;
  margin: 0;
  padding: 0 0 0.9rem;
  display: grid;
  grid-auto-flow: column;
  grid-auto-columns: minmax(14rem, 16.5rem);
  gap: 1rem;
  overflow-x: auto;
  overscroll-behavior-x: contain;
  scroll-snap-type: x proximity;
  -webkit-overflow-scrolling: touch;
}

.page-about .about-node {
  position: relative;
  padding: 2.1rem 1.05rem 1.2rem;
  border: var(--bw) solid var(--c-line);
  border-top: 3px solid var(--c-cyan);
  background: linear-gradient(165deg, rgba(22, 35, 47, 0.95), rgba(14, 23, 33, 0.98));
  scroll-snap-align: start;
  transition: border-color 0.16s var(--ease), transform 0.16s var(--ease), box-shadow 0.16s var(--ease);
}

.page-about .about-node:hover,
.page-about .about-node:focus-within {
  border-color: var(--c-green);
  border-top-color: var(--c-orange);
  transform: translateY(-3px);
  box-shadow: var(--shadow-green);
}

.page-about .about-node__dot {
  position: absolute;
  top: 0.85rem;
  left: 1.05rem;
  width: 0.7rem;
  height: 0.7rem;
  border-radius: 50%;
  background: var(--c-orange);
  box-shadow: 0 0 0 4px rgba(255, 107, 26, 0.16);
}

.page-about .about-node__ver {
  margin: 0 0 0.5rem;
  font-family: var(--font-num);
  font-size: 0.74rem;
  letter-spacing: 0.1em;
  color: var(--c-lime);
}

.page-about .about-node__title {
  margin: 0 0 0.55rem;
  font-family: var(--font-head);
  font-weight: 800;
  font-size: 1.06rem;
  line-height: 1.4;
  color: var(--c-text);
}

.page-about .about-node__text {
  margin: 0;
  font-size: 0.86rem;
  line-height: 1.78;
  color: var(--c-muted);
}

/* ---------- 内容生产流程 ---------- */
.page-about .about-process__media {
  margin: 0 0 2rem;
}

.page-about .about-frame {
  position: relative;
  overflow: hidden;
  border: var(--about-frame-border);
  box-shadow: var(--shadow-hard);
  background: var(--c-panel);
}

.page-about .about-frame--tight {
  box-shadow: var(--shadow-hard);
}

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

.page-about .about-process__media .media__cap,
.page-about .about-alt__aside .media__cap {
  margin: 0.65rem 0 0;
  font-size: 0.78rem;
  line-height: 1.7;
  color: var(--c-muted);
}

.page-about .about-process {
  list-style: none;
  margin: 0;
  padding: 0;
}

.page-about .about-process__step {
  display: grid;
  grid-template-columns: 3rem minmax(0, 1fr);
  gap: 1rem 1.15rem;
  padding-bottom: 1.6rem;
}

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

.page-about .about-process__marker {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.55rem;
}

.page-about .about-process__num {
  flex: none;
  width: 2.45rem;
  height: 2.45rem;
  display: grid;
  place-items: center;
  font-family: var(--font-num);
  font-weight: 700;
  font-size: 0.9rem;
  color: var(--c-ink);
  background: var(--c-green);
  border: var(--bw) solid var(--c-ink);
  box-shadow: var(--shadow-hard);
}

.page-about .about-process__arrow {
  flex: 1 1 auto;
  width: 0.75rem;
  min-height: 1.75rem;
  color: var(--c-line);
}

.page-about .about-process__step:last-child .about-process__arrow {
  display: none;
}

.page-about .about-process__body {
  padding-top: 0.3rem;
  border-bottom: 1px solid rgba(36, 56, 74, 0.7);
  padding-bottom: 1.1rem;
}

.page-about .about-process__step:last-child .about-process__body {
  border-bottom: 0;
  padding-bottom: 0;
}

.page-about .about-process__title {
  margin: 0 0 0.45rem;
  font-family: var(--font-head);
  font-weight: 800;
  font-size: 1.05rem;
  line-height: 1.4;
  color: var(--c-cyan);
}

.page-about .about-process__text {
  margin: 0;
  font-size: 0.94rem;
  line-height: 1.85;
  color: var(--c-text);
}

/* ---------- 团队与规模 ---------- */
.page-about .filterbar {
  margin-bottom: 1.25rem;
}

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

.page-about .about-role {
  padding: 1.25rem 1.1rem 1.35rem;
  border: var(--bw) solid var(--c-line);
  border-top: 3px solid var(--c-green);
  background: var(--c-panel);
  transition: border-color 0.16s var(--ease), box-shadow 0.16s var(--ease);
}

.page-about .about-role:hover {
  border-color: var(--c-green);
  box-shadow: var(--shadow-green);
}

.page-about .about-role.is-hidden,
.page-about .about-role[hidden] {
  display: none;
}

.page-about .about-role__count {
  margin: 0 0 0.5rem;
  font-family: var(--font-num);
  font-weight: 700;
  font-size: 2.1rem;
  line-height: 1;
  color: var(--c-lime);
}

.page-about .about-role__name {
  margin: 0 0 0.5rem;
  font-family: var(--font-head);
  font-weight: 800;
  font-size: 1.05rem;
  color: var(--c-text);
}

.page-about .about-role__desc {
  margin: 0;
  font-size: 0.88rem;
  line-height: 1.8;
  color: var(--c-muted);
}

.page-about .about-alt {
  margin-top: clamp(2rem, 4vw, 3rem);
  display: grid;
  gap: clamp(1.75rem, 4vw, 2.75rem);
}

.page-about .about-alt__row {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1.25rem;
}

.page-about .about-alt__title {
  margin: 0 0 0.6rem;
  font-family: var(--font-head);
  font-weight: 800;
  font-size: 1.15rem;
  line-height: 1.45;
  color: var(--c-text);
}

.page-about .about-alt__copy p {
  margin: 0;
  font-size: 0.96rem;
  line-height: 1.88;
  color: var(--c-muted);
  max-width: 62ch;
}

.page-about .about-figures {
  margin: 0;
  display: grid;
  gap: 0.55rem;
  align-content: start;
}

.page-about .about-figure {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 1rem;
  padding: 0.7rem 0.85rem;
  border: 1px solid var(--c-line);
  border-left: 3px solid var(--c-orange);
  background: rgba(22, 35, 47, 0.65);
}

.page-about .about-figure dt {
  font-size: 0.8rem;
  letter-spacing: 0.06em;
  color: var(--c-muted);
}

.page-about .about-figure dd {
  margin: 0;
  font-family: var(--font-num);
  font-weight: 700;
  font-size: 1.2rem;
  color: var(--c-lime);
  white-space: nowrap;
}

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

.page-about .about-partner {
  padding: 1.35rem 1.15rem 1.45rem;
  border: var(--bw) solid var(--c-line);
  border-left: 4px solid var(--c-orange);
  background: linear-gradient(160deg, rgba(22, 35, 47, 0.92), rgba(14, 23, 33, 0.96));
}

.page-about .about-partner--wide {
  border-left-color: var(--c-cyan);
}

.page-about .about-partner__count {
  margin: 0 0 0.5rem;
  font-family: var(--font-num);
  font-weight: 700;
  font-size: 2rem;
  line-height: 1;
  color: var(--c-orange);
}

.page-about .about-partner__name {
  margin: 0 0 0.5rem;
  font-family: var(--font-head);
  font-weight: 800;
  font-size: 1.05rem;
  color: var(--c-text);
}

.page-about .about-partner__desc {
  margin: 0;
  font-size: 0.9rem;
  line-height: 1.82;
  color: var(--c-muted);
}

/* ---------- 结尾入口 ---------- */
.page-about .about-cta__inner {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1.5rem;
  padding: clamp(1.75rem, 4vw, 2.75rem);
  border: var(--bw) solid var(--c-line);
  background:
    linear-gradient(135deg, rgba(46, 230, 168, 0.14), rgba(255, 107, 26, 0.12) 58%, rgba(14, 23, 33, 0) 100%),
    var(--c-panel);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 2.25rem), calc(100% - 2.25rem) 100%, 0 100%);
}

.page-about .about-cta__title {
  margin: 0 0 0.7rem;
  font-family: var(--font-head);
  font-weight: 900;
  font-size: clamp(1.4rem, 3vw, 1.9rem);
  line-height: 1.3;
  letter-spacing: -0.015em;
  color: var(--c-text);
}

.page-about .about-cta__copy p {
  margin: 0;
  font-size: 0.95rem;
  line-height: 1.85;
  color: var(--c-muted);
  max-width: 60ch;
}

.page-about .about-cta__link {
  color: var(--c-cyan);
  text-decoration: underline;
  text-underline-offset: 3px;
}

.page-about .about-cta__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.7rem;
}

/* ---------- 响应式 ---------- */
@media (min-width: 640px) {
  .page-about .about-hero__kpis {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

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

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

@media (min-width: 900px) {
  .page-about .about-alt__row {
    grid-template-columns: 1.15fr 1fr;
    align-items: start;
    gap: 2.25rem;
  }

  .page-about .about-alt__row--flip .about-alt__copy {
    order: 2;
  }

  .page-about .about-alt__row--flip .about-alt__aside {
    order: 1;
  }

  .page-about .about-cta__inner {
    grid-template-columns: minmax(0, 1.5fr) auto;
    align-items: center;
  }

  .page-about .about-cta__actions {
    justify-content: flex-end;
  }
}

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

  .page-about .about-index {
    position: sticky;
    top: 6rem;
  }

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

  .page-about .about-process__step {
    grid-template-columns: 3.25rem minmax(0, 1fr);
    gap: 1.35rem 1.5rem;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-node,
  .page-about .about-role,
  .page-about .about-index__link {
    transition: none;
  }

  .page-about .about-node:hover {
    transform: none;
  }
}