.page-about {
  --about-grid: rgba(95, 200, 240, 0.13);
  --about-line: rgba(95, 200, 240, 0.2);
  --about-soft: rgba(95, 200, 240, 0.09);
  --about-muted: rgba(201, 214, 226, 0.76);
  background: var(--ink);
  color: var(--silver);
}

/* ---------- 面包屑 ---------- */
.page-about .about-crumb ol {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.55rem;
  margin: 0;
  padding: clamp(1.4rem, 3vw, 2.2rem) 0 0;
  list-style: none;
  font-family: var(--mono);
  font-size: 0.72rem;
  letter-spacing: 0.16em;
  color: rgba(201, 214, 226, 0.58);
}

.page-about .about-crumb li + li::before {
  content: "/";
  margin-right: 0.55rem;
  color: rgba(95, 200, 240, 0.45);
}

.page-about .about-crumb a {
  color: var(--ice);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: border-color 180ms var(--ease);
}

.page-about .about-crumb a:hover,
.page-about .about-crumb a:focus-visible {
  border-bottom-color: var(--ice);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  padding: clamp(1.8rem, 4vw, 3rem) 0 clamp(2.4rem, 5vw, 4rem);
  position: relative;
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  inset: 0 0 auto 0;
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--ice), transparent);
  opacity: 0.5;
}

.page-about .about-hero h1 {
  margin: 0.7rem 0 0;
  font-family: var(--sans);
  font-weight: 900;
  font-size: clamp(2.4rem, 8vw, 5.6rem);
  line-height: 0.98;
  letter-spacing: -0.02em;
  color: var(--frost);
}

.page-about .about-hero__lede {
  max-width: 46rem;
  margin: clamp(1.1rem, 2.4vw, 1.6rem) 0 0;
  font-size: clamp(1rem, 1.5vw, 1.12rem);
  line-height: 1.85;
  color: var(--silver);
}

.page-about .about-hero__stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin: clamp(1.8rem, 4vw, 2.6rem) 0 0;
  padding: 0;
  list-style: none;
  background: var(--about-line);
  border: 1px solid var(--about-line);
}

.page-about .about-hero__stats li {
  background: var(--ink);
  padding: 1rem 1.1rem 1.1rem;
}

.page-about .about-hero__stat-num {
  display: block;
  font-family: var(--mono);
  font-weight: 700;
  font-size: clamp(1.35rem, 3vw, 1.75rem);
  letter-spacing: 0.02em;
  color: var(--gold);
  font-variant-numeric: tabular-nums;
}

.page-about .about-hero__stat-label {
  display: block;
  margin-top: 0.4rem;
  font-size: 0.76rem;
  letter-spacing: 0.08em;
  color: rgba(201, 214, 226, 0.62);
}

.page-about .about-jump {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem 1.1rem;
  margin-top: clamp(1.6rem, 3vw, 2.2rem);
  padding-top: 1.2rem;
  border-top: 1px solid var(--about-soft);
  font-family: var(--mono);
  font-size: 0.71rem;
  letter-spacing: 0.14em;
}

.page-about .about-jump a {
  color: rgba(201, 214, 226, 0.68);
  text-decoration: none;
  padding: 0.25rem 0;
  border-bottom: 1px solid transparent;
  transition: color 180ms var(--ease), border-color 180ms var(--ease);
}

.page-about .about-jump a:hover,
.page-about .about-jump a:focus-visible {
  color: var(--ice);
  border-bottom-color: var(--ice);
}

/* ---------- 通用区块 ---------- */
.page-about .about-sec {
  padding: clamp(3rem, 7vw, 6rem) 0;
}

.page-about .about-head {
  max-width: 54rem;
}

.page-about .about-head h2 {
  margin: 0.65rem 0 0;
  font-family: var(--sans);
  font-weight: 800;
  font-size: clamp(1.6rem, 3.5vw, 2.7rem);
  line-height: 1.2;
  letter-spacing: -0.01em;
  color: var(--frost);
}

.page-about .about-head > p:not(.eyebrow) {
  margin: 1rem 0 0;
  max-width: 44rem;
  line-height: 1.85;
  color: var(--about-muted);
}

.page-about .about-figure {
  position: relative;
  margin: 0;
  overflow: hidden;
  border: 1px solid var(--about-line);
  background: linear-gradient(160deg, var(--night), var(--ink));
}

.page-about .about-figure::after {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(var(--about-grid) 1px, transparent 1px),
    linear-gradient(90deg, var(--about-grid) 1px, transparent 1px);
  background-size: 48px 48px;
  pointer-events: none;
}

.page-about .about-figure img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
}

/* ---------- 创立起点 ---------- */
.page-about .about-origin {
  border-top: 1px solid var(--about-soft);
}

.page-about .about-origin__grid {
  display: grid;
  gap: 1.6rem;
}

.page-about .about-origin__text p {
  margin: 0 0 1.1rem;
  max-width: 40rem;
  line-height: 1.85;
  color: var(--about-muted);
}

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

.page-about .about-origin__figure {
  margin-top: clamp(2rem, 5vw, 3.4rem);
  aspect-ratio: 3 / 2;
}

/* ---------- 发展历程 ---------- */
.page-about .about-timeline {
  background: var(--night);
  border-top: 1px solid var(--about-soft);
  border-bottom: 1px solid var(--about-soft);
}

.page-about .about-tl__grid {
  display: grid;
  gap: 2rem;
  margin-top: clamp(2rem, 4.5vw, 3.2rem);
}

.page-about .about-axis {
  position: relative;
  padding-left: 1.75rem;
}

.page-about .about-axis::before {
  content: "";
  position: absolute;
  left: 5px;
  top: 0.9rem;
  bottom: 0.9rem;
  width: 1px;
  background: linear-gradient(180deg, var(--ice), rgba(95, 200, 240, 0.08));
}

.page-about .about-node {
  position: relative;
}

.page-about .about-node::before {
  content: "";
  position: absolute;
  left: -1.75rem;
  top: 1.35rem;
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--gold);
  box-shadow: 0 0 0 4px rgba(217, 164, 65, 0.12);
}

.page-about .about-node + .about-node {
  margin-top: 0.35rem;
}

.page-about .about-node__sum {
  display: grid;
  grid-template-columns: minmax(4.1rem, auto) minmax(0, 1fr) auto;
  align-items: baseline;
  gap: 0.9rem;
  padding: 1rem 0.4rem 1rem 0;
  cursor: pointer;
  list-style: none;
  border-bottom: 1px solid var(--about-soft);
  transition: border-color 180ms var(--ease);
}

.page-about .about-node__sum::-webkit-details-marker {
  display: none;
}

.page-about .about-node__sum:hover,
.page-about .about-node__sum:focus-visible {
  border-bottom-color: rgba(95, 200, 240, 0.42);
}

.page-about .about-node__sum::after {
  content: "+";
  font-family: var(--mono);
  font-size: 1rem;
  line-height: 1;
  color: var(--ice);
}

.page-about .about-node[open] .about-node__sum::after {
  content: "\2013";
}

.page-about .about-node__year {
  font-family: var(--mono);
  font-weight: 700;
  font-size: 1.05rem;
  letter-spacing: 0.04em;
  color: var(--gold);
  font-variant-numeric: tabular-nums;
}

.page-about .about-node__title {
  font-size: clamp(1rem, 1.7vw, 1.12rem);
  font-weight: 600;
  line-height: 1.5;
  color: var(--frost);
}

.page-about .about-node__body {
  padding: 0 1.6rem 1.1rem 0;
}

.page-about .about-node__body p {
  margin: 0;
  max-width: 40rem;
  font-size: 0.95rem;
  line-height: 1.85;
  color: var(--about-muted);
}

.page-about .about-tl__figure {
  aspect-ratio: 12 / 7;
}

/* ---------- 团队 ---------- */
.page-about .about-team__figure {
  margin-top: clamp(1.8rem, 4vw, 2.6rem);
  aspect-ratio: 3 / 2;
}

.page-about .about-roles {
  display: grid;
  gap: 2rem;
  margin: clamp(2rem, 4vw, 3rem) 0 0;
  padding: 0;
  list-style: none;
}

.page-about .about-role {
  --w: 50%;
  padding-top: 0.9rem;
}

.page-about .about-role:nth-child(1) {
  --w: 100%;
}

.page-about .about-role:nth-child(2) {
  --w: 67%;
}

.page-about .about-role:nth-child(3) {
  --w: 44%;
}

.page-about .about-role:nth-child(4) {
  --w: 44%;
}

.page-about .about-role__bar {
  display: block;
  width: var(--w);
  height: 3px;
  margin-bottom: 1rem;
  background: linear-gradient(90deg, var(--ice), var(--ice-deep));
  transition: background 220ms var(--ease);
}

.page-about .about-role:hover .about-role__bar {
  background: linear-gradient(90deg, var(--gold), var(--ice));
}

.page-about .about-role__num {
  font-family: var(--mono);
  font-weight: 700;
  font-size: 1.4rem;
  letter-spacing: 0.02em;
  color: var(--gold);
  font-variant-numeric: tabular-nums;
}

.page-about .about-role__name {
  margin-left: 0.7rem;
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--frost);
}

.page-about .about-role__desc {
  margin: 0.75rem 0 0;
  max-width: 30rem;
  font-size: 0.94rem;
  line-height: 1.8;
  color: rgba(201, 214, 226, 0.7);
  transition: color 220ms var(--ease);
}

.page-about .about-role:hover .about-role__desc,
.page-about .about-role:focus-within .about-role__desc {
  color: var(--silver);
}

/* ---------- 校对与存档 ---------- */
.page-about .about-proof {
  background: var(--night);
  border-top: 1px solid var(--about-soft);
  border-bottom: 1px solid var(--about-soft);
}

.page-about .about-steps {
  display: grid;
  gap: 1.8rem;
  margin: clamp(2rem, 4vw, 3rem) 0 0;
  padding: 0;
  list-style: none;
}

.page-about .about-step {
  padding-top: 1rem;
  border-top: 1px solid var(--about-line);
}

.page-about .about-step__num {
  display: block;
  font-family: var(--mono);
  font-size: 0.78rem;
  letter-spacing: 0.2em;
  color: var(--ice);
}

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

.page-about .about-step p {
  margin: 0.6rem 0 0;
  font-size: 0.94rem;
  line-height: 1.85;
  color: var(--about-muted);
}

.page-about .about-quote {
  margin: clamp(2.2rem, 4.5vw, 3.2rem) 0 0;
  padding: 0.2rem 0 0.2rem 1.3rem;
  border-left: 3px solid var(--ice-deep);
}

.page-about .about-quote p {
  margin: 0;
  max-width: 34rem;
  font-size: 1.02rem;
  font-style: italic;
  line-height: 1.85;
  color: var(--silver);
}

.page-about .about-quote cite {
  display: block;
  margin-top: 0.8rem;
  font-family: var(--mono);
  font-size: 0.72rem;
  font-style: normal;
  letter-spacing: 0.18em;
  color: rgba(95, 200, 240, 0.72);
}

.page-about .about-kpi {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 1px;
  margin: clamp(2rem, 4vw, 2.8rem) 0 0;
  padding: 0;
  background: var(--about-line);
  border: 1px solid var(--about-line);
}

.page-about .about-kpi__item {
  background: var(--night);
  padding: 1.1rem 1rem 1.2rem;
}

.page-about .about-kpi__item dt {
  font-size: 0.76rem;
  letter-spacing: 0.08em;
  color: rgba(201, 214, 226, 0.62);
}

.page-about .about-kpi__item dd {
  margin: 0.55rem 0 0;
  display: flex;
  align-items: baseline;
  gap: 0.3rem;
}

.page-about .about-kpi__num {
  font-family: var(--mono);
  font-weight: 700;
  font-size: clamp(1.4rem, 3.4vw, 1.9rem);
  color: var(--gold);
  font-variant-numeric: tabular-nums;
}

.page-about .about-kpi__unit {
  font-size: 0.78rem;
  color: rgba(201, 214, 226, 0.66);
}

.page-about .about-proof__link {
  margin: clamp(1.8rem, 3.5vw, 2.4rem) 0 0;
  max-width: 42rem;
  line-height: 1.85;
  color: var(--about-muted);
}

.page-about .about-proof__link a,
.page-about .about-columns__link a,
.page-about .about-base__more a {
  color: var(--ice);
  text-decoration: none;
  border-bottom: 1px solid rgba(95, 200, 240, 0.4);
  transition: border-color 180ms var(--ease);
}

.page-about .about-proof__link a:hover,
.page-about .about-columns__link a:hover,
.page-about .about-base__more a:hover {
  border-bottom-color: var(--ice);
}

/* ---------- 七项栏目 ---------- */
.page-about .about-cols {
  display: grid;
  gap: 0;
  margin: clamp(2rem, 4vw, 3rem) 0 0;
  padding: 0;
  list-style: none;
  border-top: 1px solid var(--about-line);
}

.page-about .about-col {
  display: grid;
  grid-template-columns: 2.6rem minmax(0, 1fr);
  gap: 0.8rem;
  padding: 1.4rem 0.6rem 1.4rem 0;
  border-bottom: 1px solid var(--about-soft);
  transition: padding-left 200ms var(--ease), background 200ms var(--ease);
}

.page-about .about-col:hover {
  padding-left: 0.7rem;
  background: linear-gradient(90deg, rgba(95, 200, 240, 0.07), transparent 70%);
}

.page-about .about-col__num {
  font-family: var(--mono);
  font-size: 0.8rem;
  letter-spacing: 0.14em;
  color: var(--ice);
  padding-top: 0.28rem;
  font-variant-numeric: tabular-nums;
}

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

.page-about .about-col__body p {
  margin: 0.55rem 0 0;
  max-width: 44rem;
  font-size: 0.94rem;
  line-height: 1.85;
  color: var(--about-muted);
}

.page-about .about-columns__link {
  margin: clamp(1.8rem, 3.5vw, 2.4rem) 0 0;
  max-width: 46rem;
  line-height: 1.85;
  color: var(--about-muted);
}

/* ---------- 运营地与联络 ---------- */
.page-about .about-base {
  border-top: 1px solid var(--about-soft);
}

.page-about .about-base__grid {
  display: grid;
  gap: 2.4rem;
}

.page-about .about-base__grid > div > p {
  margin: 1rem 0 0;
  max-width: 40rem;
  line-height: 1.85;
  color: var(--about-muted);
}

.page-about .about-base__icp {
  font-family: var(--mono);
  font-size: 0.92em;
  letter-spacing: 0.04em;
  color: var(--silver);
}

.page-about .about-base__panel {
  padding: 1.4rem 1.3rem 1.5rem;
  background: var(--night);
  border: 1px solid var(--about-line);
}

.page-about .about-base__panel-title {
  margin: 0;
  font-family: var(--mono);
  font-size: 0.74rem;
  letter-spacing: 0.2em;
  color: var(--gold);
}

.page-about .about-contact {
  margin: 1.2rem 0 0;
  padding: 0;
}

.page-about .about-contact__row {
  padding: 0.9rem 0;
  border-top: 1px solid var(--about-soft);
}

.page-about .about-contact__row:first-child {
  border-top: 0;
  padding-top: 0.2rem;
}

.page-about .about-contact__row dt {
  font-size: 0.74rem;
  letter-spacing: 0.1em;
  color: rgba(201, 214, 226, 0.58);
}

.page-about .about-contact__row dd {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.7rem;
  margin: 0.45rem 0 0;
}

.page-about .about-contact__val {
  font-family: var(--mono);
  font-size: 0.92rem;
  letter-spacing: 0.02em;
  color: var(--frost);
  word-break: break-word;
}

.page-about .about-base__note {
  margin: 1.2rem 0 0;
  padding-top: 1rem;
  border-top: 1px solid var(--about-soft);
  font-size: 0.86rem;
  line-height: 1.75;
  color: rgba(201, 214, 226, 0.66);
}

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

  .page-about .about-origin__grid {
    grid-template-columns: minmax(0, 1.02fr) minmax(0, 1fr);
    gap: clamp(2rem, 4vw, 3.4rem);
    align-items: start;
  }

  .page-about .about-origin__figure {
    aspect-ratio: 16 / 7;
  }

  .page-about .about-steps {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 1.6rem;
  }

  .page-about .about-roles {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 2.4rem 3rem;
  }
}

@media (min-width: 1000px) {
  .page-about .about-crumb ol {
    padding-top: clamp(2rem, 3vw, 2.8rem);
  }

  .page-about .about-tl__grid {
    grid-template-columns: minmax(0, 1fr) 400px;
    gap: clamp(2.4rem, 4vw, 4rem);
    align-items: start;
  }

  .page-about .about-base__grid {
    grid-template-columns: minmax(0, 1fr) minmax(320px, 420px);
    gap: clamp(2.4rem, 4vw, 4rem);
    align-items: start;
  }

  .page-about .about-col {
    grid-template-columns: 3.4rem minmax(0, 1fr);
  }
}

@media (max-width: 420px) {
  .page-about .about-node__sum {
    grid-template-columns: minmax(3.4rem, auto) minmax(0, 1fr) auto;
    gap: 0.6rem;
  }

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

@media (prefers-reduced-motion: reduce) {
  .page-about * {
    transition-duration: 0.01ms !important;
    animation-duration: 0.01ms !important;
  }
}