.page-about {
  --about-rail-w: 232px;
  --about-gap: clamp(1.5rem, 3.5vw, 2.75rem);
}

/* ---------- 面包屑 ---------- */
.page-about .about-breadcrumbs {
  margin-top: clamp(1rem, 3vw, 1.75rem);
  margin-bottom: clamp(1rem, 3vw, 1.75rem);
  font-size: 0.8125rem;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  isolation: isolate;
  overflow: hidden;
  border-block: 1px solid var(--grid);
  background:
    radial-gradient(95% 130% at 94% -14%, rgba(53, 240, 160, 0.13), transparent 60%),
    radial-gradient(78% 110% at 4% 0%, rgba(47, 125, 255, 0.20), transparent 66%),
    linear-gradient(180deg, rgba(14, 42, 77, 0.55) 0%, rgba(10, 14, 20, 0) 82%);
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  z-index: -1;
  pointer-events: none;
  background-image: linear-gradient(to right, rgba(31, 42, 56, 0.85) 1px, transparent 1px);
  background-size: 118px 100%;
  opacity: 0.55;
  -webkit-mask-image: linear-gradient(to bottom, #000 0%, transparent 88%);
  mask-image: linear-gradient(to bottom, #000 0%, transparent 88%);
}

.page-about .about-hero-inner {
  display: grid;
  gap: 1.25rem;
  padding-block: clamp(2.25rem, 7vw, 4.5rem);
}

.page-about .about-eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 0.6rem;
  margin: 0;
  font-family: var(--mono);
  font-size: 0.75rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--neon);
}

.page-about .about-eyebrow-num {
  display: inline-grid;
  place-items: center;
  width: 1.75rem;
  height: 1.75rem;
  border: 1px solid rgba(53, 240, 160, 0.45);
  border-radius: 50%;
  font-size: 0.6875rem;
  letter-spacing: 0;
  color: var(--neon);
}

.page-about .about-hero h1 {
  margin: 0;
  max-width: 20ch;
  font-size: clamp(2rem, 6.2vw, 3.6rem);
  font-weight: 700;
  line-height: 1.08;
  letter-spacing: -0.025em;
  color: var(--text);
}

.page-about .about-hero-lead {
  margin: 0;
  max-width: 62ch;
  font-size: clamp(1rem, 1.6vw, 1.125rem);
  line-height: 1.85;
  color: var(--ice);
}

.page-about .about-hero-facts {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin: clamp(0.75rem, 3vw, 1.75rem) 0 0;
  padding: 0;
  background: var(--grid);
  border: 1px solid var(--grid);
  border-radius: var(--radius-md);
  overflow: hidden;
}

.page-about .about-fact {
  padding: 0.95rem 1.1rem;
  background: linear-gradient(160deg, rgba(19, 26, 36, 0.94), rgba(13, 19, 28, 0.94));
}

.page-about .about-fact dt {
  margin: 0;
  font-size: 0.75rem;
  letter-spacing: 0.04em;
  color: var(--muted);
}

.page-about .about-fact dd {
  margin: 0.4rem 0 0;
  font-size: 1.25rem;
  font-weight: 700;
  letter-spacing: -0.01em;
  color: var(--text);
}

.page-about .about-fact dd .num {
  color: var(--neon);
}

/* ---------- 章节标题 ---------- */
.page-about .about-section-head {
  margin-bottom: clamp(1.5rem, 4vw, 2.5rem);
}

.page-about .section-lead {
  max-width: 68ch;
}

/* ---------- 演进：索引 + 阶段 ---------- */
.page-about .about-flow {
  display: grid;
  gap: var(--about-gap);
}

.page-about .about-rail-title {
  margin: 0 0 0.75rem;
  font-family: var(--mono);
  font-size: 0.6875rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--muted);
}

.page-about .about-rail .index-list {
  display: flex;
  flex-direction: row;
  gap: 0.5rem;
  margin: 0;
  padding: 0 0 0.6rem;
  list-style: none;
  overflow-x: auto;
  scrollbar-width: thin;
}

.page-about .about-rail .index-link {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.5rem 0.85rem;
  border: 1px solid var(--grid);
  border-radius: var(--radius-pill);
  background: var(--panel-deep);
  font-size: 0.8125rem;
  white-space: nowrap;
  color: var(--ice);
  text-decoration: none;
  transition: border-color 180ms var(--ease), color 180ms var(--ease), background-color 180ms var(--ease);
}

.page-about .about-rail .index-link .num {
  font-size: 0.6875rem;
  color: var(--blue);
}

.page-about .about-rail .index-link:hover,
.page-about .about-rail .index-link:focus-visible,
.page-about .about-rail .index-link[aria-current="true"] {
  border-color: var(--neon);
  color: var(--text);
  background: rgba(53, 240, 160, 0.07);
  outline: none;
}

.page-about .about-stream {
  display: grid;
  gap: clamp(1.5rem, 4vw, 2.5rem);
}

.page-about .about-stage {
  position: relative;
  padding-left: 1.4rem;
  border-left: 1px solid var(--grid);
  transition: border-color 220ms var(--ease);
}

.page-about .about-stage::before {
  content: "";
  position: absolute;
  left: -4px;
  top: 0.6rem;
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--blue);
  box-shadow: 0 0 0 4px rgba(47, 125, 255, 0.14);
  transition: background-color 220ms var(--ease), box-shadow 220ms var(--ease);
}

.page-about .about-stage:hover {
  border-left-color: var(--neon);
}

.page-about .about-stage:hover::before {
  background: var(--neon);
  box-shadow: 0 0 0 5px rgba(53, 240, 160, 0.16);
}

.page-about .about-stage-index {
  margin: 0 0 0.4rem;
  font-family: var(--mono);
  font-size: 0.6875rem;
  letter-spacing: 0.12em;
  color: var(--blue);
}

.page-about .about-stage-title {
  margin: 0 0 0.75rem;
  font-size: clamp(1.15rem, 2.2vw, 1.4rem);
  font-weight: 700;
  letter-spacing: -0.015em;
  color: var(--text);
}

.page-about .about-stage p {
  margin: 0 0 0.7rem;
  line-height: 1.85;
  color: var(--ice);
}

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

/* ---------- 横向数据带 ---------- */
.page-about .about-band {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1px;
  background: var(--grid);
  border: 1px solid var(--grid);
  border-radius: var(--radius-lg);
  overflow: hidden;
}

.page-about .about-band-item {
  padding: 1.1rem 1.25rem;
  background: linear-gradient(140deg, var(--panel) 0%, var(--panel-deep) 100%);
}

.page-about .about-band-label {
  margin: 0;
  font-size: 0.75rem;
  letter-spacing: 0.08em;
  color: var(--muted);
}

.page-about .about-band-value {
  margin: 0.45rem 0 0.3rem;
  font-family: var(--mono);
  font-size: clamp(1.5rem, 4vw, 1.9rem);
  font-weight: 700;
  color: var(--neon);
  letter-spacing: -0.02em;
}

.page-about .about-band-note {
  margin: 0;
  font-size: 0.8125rem;
  line-height: 1.6;
  color: var(--ice);
}

/* ---------- 团队 ---------- */
.page-about .about-team-figure {
  margin: 0 0 clamp(1.75rem, 4vw, 2.5rem);
}

.page-about .about-team-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.1rem;
}

.page-about .about-team-card {
  position: relative;
  padding: 1.4rem 1.4rem 1.5rem;
  border: 1px solid var(--grid);
  background: var(--panel-deep);
  border-radius: 22px 14px 20px 14px;
  transition: border-color 200ms var(--ease), transform 200ms var(--ease);
}

.page-about .about-team-card:nth-child(2) {
  border-radius: 14px 24px 14px 22px;
}

.page-about .about-team-card:nth-child(3) {
  border-radius: 20px 16px 26px 14px;
}

.page-about .about-team-card:hover {
  border-color: var(--neon);
  transform: translateY(-2px);
}

.page-about .about-team-num {
  display: inline-block;
  margin: 0 0 0.65rem;
  padding: 0.15rem 0.5rem;
  border: 1px solid var(--grid);
  border-radius: var(--radius-pill);
  font-size: 0.6875rem;
  letter-spacing: 0.1em;
  color: var(--blue);
}

.page-about .about-team-card h3 {
  margin: 0 0 0.6rem;
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--text);
}

.page-about .about-team-card p {
  margin: 0;
  line-height: 1.8;
  color: var(--ice);
}

.page-about .about-quote {
  margin: clamp(1.75rem, 4vw, 2.5rem) 0 0;
  padding: 0.35rem 0 0.35rem 1.25rem;
  border-left: 3px solid var(--neon);
}

.page-about .about-quote p {
  margin: 0;
  max-width: 64ch;
  font-size: 1rem;
  line-height: 1.9;
  color: var(--text);
}

/* ---------- 流程 ---------- */
.page-about .about-flowline-wrap {
  display: grid;
  gap: clamp(1.5rem, 4vw, 2.5rem);
}

.page-about .about-steps {
  display: grid;
  gap: 1px;
  margin: 0;
  padding: 0;
  list-style: none;
  background: var(--grid);
  border: 1px solid var(--grid);
  border-radius: var(--radius-lg);
  overflow: hidden;
}

.page-about .about-step {
  position: relative;
  padding: 1.2rem 1.25rem 1.3rem;
  background: linear-gradient(150deg, rgba(19, 26, 36, 0.96), rgba(13, 19, 28, 0.96));
}

.page-about .about-step::after {
  content: "";
  position: absolute;
  left: 1.25rem;
  bottom: 0;
  width: 2.5rem;
  height: 2px;
  background: linear-gradient(90deg, var(--blue), transparent);
}

.page-about .about-step-num {
  margin: 0 0 0.5rem;
  font-family: var(--mono);
  font-size: 0.6875rem;
  letter-spacing: 0.14em;
  color: var(--neon);
}

.page-about .about-step h3 {
  margin: 0 0 0.5rem;
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--text);
}

.page-about .about-step p {
  margin: 0;
  font-size: 0.9375rem;
  line-height: 1.8;
  color: var(--ice);
}

.page-about .about-flow-figure {
  margin: 0;
}

/* ---------- 覆盖与协作 ---------- */
.page-about .about-coverage-layout {
  display: grid;
  gap: clamp(1.5rem, 4vw, 2.25rem);
}

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

.page-about .about-coverage-item {
  display: flex;
  align-items: baseline;
  gap: 0.6rem;
  padding: 0.9rem 1rem;
  border: 1px solid var(--grid);
  border-radius: 16px 10px 16px 10px;
  background: linear-gradient(150deg, rgba(47, 125, 255, 0.12), rgba(13, 19, 28, 0.9));
  transition: border-color 200ms var(--ease), background-color 200ms var(--ease);
}

.page-about .about-coverage-item:hover {
  border-color: var(--neon);
}

.page-about .about-coverage-idx {
  font-size: 0.6875rem;
  color: var(--blue);
}

.page-about .about-coverage-name {
  font-size: 1rem;
  font-weight: 700;
  letter-spacing: 0.02em;
  color: var(--text);
}

.page-about .about-coverage-note {
  margin: 1.1rem 0 0;
  line-height: 1.85;
  color: var(--ice);
}

.page-about .about-coverage-figure {
  margin: 0;
}

.page-about .about-partners {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.1rem;
  margin-top: clamp(1.5rem, 4vw, 2.25rem);
}

.page-about .about-partner {
  padding: 1.3rem 1.35rem;
  border: 1px solid var(--grid);
  border-radius: var(--radius-md);
  background: var(--panel-deep);
}

.page-about .about-partner-tag {
  margin: 0 0 0.7rem;
}

.page-about .about-partner h3 {
  margin: 0 0 0.55rem;
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--text);
}

.page-about .about-partner p {
  margin: 0;
  line-height: 1.8;
  color: var(--ice);
}

/* ---------- 规模 ---------- */
.page-about .about-scale-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1px;
  margin: 0;
  padding: 0;
  background: var(--grid);
  border: 1px solid var(--grid);
  border-radius: var(--radius-lg);
  overflow: hidden;
}

.page-about .about-scale-item {
  padding: 1.35rem 1.35rem 1.45rem;
  background: linear-gradient(160deg, rgba(19, 26, 36, 0.97), rgba(10, 14, 20, 0.97));
}

.page-about .about-scale-item dt {
  margin: 0;
  font-size: 0.75rem;
  letter-spacing: 0.08em;
  color: var(--muted);
}

.page-about .about-scale-item dd {
  margin: 0.5rem 0 0.4rem;
  font-family: var(--mono);
  font-size: clamp(1.9rem, 6vw, 2.6rem);
  font-weight: 700;
  line-height: 1;
  letter-spacing: -0.03em;
  color: var(--neon);
}

.page-about .about-scale-unit {
  margin-left: 0.25rem;
  font-size: 0.9rem;
  font-weight: 600;
  letter-spacing: 0;
  color: var(--ice);
}

.page-about .about-scale-item p {
  margin: 0;
  font-size: 0.875rem;
  line-height: 1.75;
  color: var(--muted);
}

/* ---------- 记录 ---------- */
.page-about .about-track-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.1rem;
}

.page-about .about-track-item {
  position: relative;
  padding: 1.3rem 1.35rem 1.4rem;
  border: 1px solid var(--grid);
  border-radius: var(--radius-md);
  background: linear-gradient(150deg, rgba(19, 26, 36, 0.95), rgba(13, 19, 28, 0.95));
}

.page-about .about-track-item::before {
  content: "";
  position: absolute;
  top: 1.35rem;
  left: 0;
  width: 3px;
  height: 1.6rem;
  background: var(--blue);
  border-radius: 0 2px 2px 0;
}

.page-about .about-track-item h3 {
  margin: 0 0 0.55rem;
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--text);
}

.page-about .about-track-item p {
  margin: 0;
  line-height: 1.8;
  color: var(--ice);
}

/* ---------- 结尾行动区 ---------- */
.page-about .about-cta {
  margin-top: clamp(3rem, 8vw, 5rem);
  border-top: 1px solid var(--grid);
  background:
    radial-gradient(80% 140% at 88% 0%, rgba(53, 240, 160, 0.10), transparent 62%),
    linear-gradient(180deg, rgba(14, 42, 77, 0.42), rgba(10, 14, 20, 0));
}

.page-about .about-cta-inner {
  display: grid;
  gap: 1.5rem;
  padding-block: clamp(2rem, 6vw, 3.5rem);
}

.page-about .about-cta-text h2 {
  margin: 0 0 0.7rem;
  font-size: clamp(1.5rem, 3.4vw, 2.1rem);
  font-weight: 700;
  letter-spacing: -0.02em;
  color: var(--text);
}

.page-about .about-cta-text p {
  margin: 0;
  max-width: 60ch;
  line-height: 1.85;
  color: var(--ice);
}

.page-about .about-cta-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
}

/* ---------- 图片统一处理 ---------- */
.page-about .figure-media {
  overflow: hidden;
  border-radius: var(--radius-lg);
  border: 1px solid var(--grid);
  background: var(--panel-deep);
}

.page-about .figure-media img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
  filter: saturate(1.05) contrast(1.04);
}

.page-about .figure-caption {
  margin-top: 0.7rem;
  font-size: 0.8125rem;
  line-height: 1.7;
  color: var(--muted);
}

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

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

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

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

@media (min-width: 900px) {
  .page-about .about-flow {
    grid-template-columns: var(--about-rail-w) minmax(0, 1fr);
    align-items: start;
  }

  .page-about .about-rail {
    position: sticky;
    top: calc(var(--header-h) + 1.75rem);
  }

  .page-about .about-rail .index-list {
    flex-direction: column;
    overflow: visible;
    padding-bottom: 0;
    gap: 0.4rem;
  }

  .page-about .about-rail .index-link {
    width: 100%;
    justify-content: flex-start;
    border-radius: var(--radius-md);
    background: transparent;
    border-color: transparent;
    border-left: 1px solid var(--grid);
  }

  .page-about .about-rail .index-link:hover,
  .page-about .about-rail .index-link:focus-visible,
  .page-about .about-rail .index-link[aria-current="true"] {
    border-color: transparent;
    border-left-color: var(--neon);
    background: rgba(53, 240, 160, 0.06);
  }

  .page-about .about-flowline-wrap {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    align-items: start;
  }

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

  .page-about .about-coverage-layout {
    grid-template-columns: minmax(0, 6fr) minmax(0, 6fr);
    align-items: start;
  }

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

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

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

  .page-about .about-cta-inner {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    align-items: center;
  }

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

@media (min-width: 1100px) {
  .page-about .about-flow-figure {
    position: sticky;
    top: calc(var(--header-h) + 1.75rem);
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-team-card,
  .page-about .about-stage,
  .page-about .about-stage::before,
  .page-about .about-rail .index-link,
  .page-about .about-coverage-item {
    transition: none;
  }

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