.page-about {
  --about-paper-raised: #FBF6EC;
  --about-rail: 216px;
  --about-gap: clamp(2rem, 5vw, 4rem);
  overflow-x: clip;
}

/* ---------- 封面 ---------- */

.page-about .about-cover {
  position: relative;
  background: var(--ink-950);
  color: var(--slate-body);
  padding-block: clamp(2rem, 5vw, 3.25rem) clamp(2.5rem, 6vw, 4.5rem);
  overflow: hidden;
}

.page-about .about-cover::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(43, 227, 218, 0.07) 1px, transparent 1px),
    linear-gradient(90deg, rgba(43, 227, 218, 0.07) 1px, transparent 1px);
  background-size: 56px 56px;
  pointer-events: none;
  -webkit-mask-image: radial-gradient(circle at 72% 18%, #000 0%, transparent 72%);
  mask-image: radial-gradient(circle at 72% 18%, #000 0%, transparent 72%);
}

.page-about .about-cover::after {
  content: "";
  position: absolute;
  width: 660px;
  height: 660px;
  right: -200px;
  top: -240px;
  background: radial-gradient(circle, rgba(124, 108, 255, 0.36), rgba(43, 227, 218, 0.14) 46%, transparent 70%);
  pointer-events: none;
}

.page-about .about-cover__inner {
  position: relative;
  z-index: 1;
  display: grid;
  gap: clamp(1.5rem, 3vw, 2.25rem);
}

.page-about .breadcrumb__list {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.5rem;
  margin: 0;
  padding: 0;
  list-style: none;
  font-size: 0.8125rem;
  color: var(--slate-dim);
}

.page-about .breadcrumb__list a {
  color: var(--mist-blue);
  text-decoration: none;
  transition: color 180ms var(--ease);
}

.page-about .breadcrumb__list a:hover {
  color: var(--neon-cyan);
}

.page-about .breadcrumb__list li[aria-current] {
  color: var(--neon-cyan);
}

.page-about .about-cover__title {
  margin: 0;
  font-size: clamp(2rem, 6.4vw, 4.25rem);
  font-weight: 900;
  line-height: 1.07;
  letter-spacing: -0.03em;
  color: #fff;
  max-width: 20ch;
}

.page-about .about-cover__lede {
  margin: 0;
  max-width: 62ch;
  font-size: clamp(1rem, 1.5vw, 1.125rem);
  line-height: 1.8;
  color: var(--slate-body);
}

.page-about .about-cover__facts {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem 2rem;
  margin: 0;
  padding: 0.9rem 1.4rem;
  list-style: none;
  border: 1px solid var(--line-dark);
  border-radius: 999px;
  background: var(--glass);
  backdrop-filter: blur(8px);
  font-size: 0.875rem;
  color: var(--mist-blue);
}

.page-about .about-cover__facts .mono {
  color: var(--neon-cyan);
  font-weight: 700;
  font-size: 1rem;
  margin-right: 0.35rem;
}

.page-about .about-cover__figure {
  margin: 0;
  border-radius: var(--radius-lg);
  overflow: hidden;
  border: 1px solid var(--line-dark);
  box-shadow: var(--shadow-lift);
}

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

/* ---------- 正文骨架 ---------- */

.page-about .about-body {
  position: relative;
  background: var(--content-paper);
  color: var(--ink-text);
  padding-block: clamp(2.5rem, 6vw, 4.5rem);
}

.page-about .about-body::before {
  content: "";
  position: absolute;
  inset-inline: 0;
  top: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--neon-cyan), var(--aurora-violet) 48%, var(--signal-amber));
}

.page-about .about-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 2.5rem;
}

.page-about .about-flow {
  display: grid;
  gap: clamp(2.75rem, 6vw, 4.5rem);
  min-width: 0;
}

/* ---------- 侧栏索引 ---------- */

.page-about .about-rail {
  min-width: 0;
}

.page-about .rail__head {
  margin: 0 0 0.9rem;
  padding-bottom: 0.6rem;
  font-size: 0.6875rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--ink-text-soft);
  border-bottom: 1px solid var(--paper-line);
}

.page-about .rail__list {
  display: grid;
  gap: 0.1rem;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .rail__link {
  display: flex;
  align-items: baseline;
  gap: 0.6rem;
  padding: 0.5rem 0.5rem 0.5rem 0.75rem;
  font-size: 0.9375rem;
  color: var(--ink-text-soft);
  text-decoration: none;
  border-left: 2px solid transparent;
  transition: color 180ms var(--ease), border-color 180ms var(--ease), background 180ms var(--ease);
}

.page-about .rail__link:hover {
  color: var(--ink-text);
  background: rgba(255, 255, 255, 0.45);
}

.page-about .rail__link[aria-current] {
  color: var(--ink-text);
  font-weight: 600;
  border-left-color: var(--neon-cyan);
  background: rgba(43, 227, 218, 0.08);
}

.page-about .rail__num {
  font-size: 0.75rem;
  color: var(--cyan-ink);
  letter-spacing: 0.06em;
}

/* ---------- 章节 ---------- */

.page-about .chapter {
  position: relative;
  padding-top: clamp(1.25rem, 3vw, 1.75rem);
  border-top: 1px solid var(--paper-line);
  scroll-margin-top: 6rem;
}

.page-about .chapter__head {
  display: flex;
  align-items: flex-start;
  gap: 0.9rem;
  margin-bottom: 1.1rem;
}

.page-about .chapter__num {
  flex: none;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 3rem;
  height: 2.4rem;
  padding-inline: 0.6rem;
  border-radius: var(--radius-sm);
  background: var(--ink-950);
  color: var(--neon-cyan);
  font-size: 0.9375rem;
  font-weight: 700;
  letter-spacing: 0.04em;
}

.page-about .chapter__title {
  margin: 0;
  font-size: clamp(1.5rem, 3.4vw, 2.125rem);
  font-weight: 800;
  line-height: 1.2;
  letter-spacing: -0.02em;
  color: var(--ink-text);
}

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

.page-about .chapter__body p {
  margin: 0 0 1rem;
  font-size: 1.0625rem;
  line-height: 1.8;
  color: var(--ink-text-soft);
}

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

.page-about .chapter__body .chapter__lead {
  font-size: 1.125rem;
  color: var(--ink-text);
}

/* ---------- 三个坐标 ---------- */

.page-about .dim-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 0.75rem;
  margin: 1.75rem 0;
}

.page-about .dim-card {
  padding: 1.1rem 1.15rem 1.25rem;
  border: 1px solid var(--paper-line);
  border-top: 3px solid var(--neon-cyan);
  border-radius: var(--radius);
  background: var(--about-paper-raised);
}

.page-about .dim-card:nth-child(2) {
  border-top-color: var(--signal-amber);
}

.page-about .dim-card:nth-child(3) {
  border-top-color: var(--aurora-violet);
}

.page-about .dim-card__label {
  margin: 0 0 0.5rem;
  font-size: 0.8125rem;
  font-weight: 700;
  letter-spacing: 0.14em;
  color: var(--cyan-ink);
}

.page-about .dim-card__text {
  margin: 0;
  font-size: 0.9375rem;
  line-height: 1.75;
  color: var(--ink-text-soft);
}

/* ---------- 配图 ---------- */

.page-about .chapter__figure {
  margin: 1.75rem 0;
  border: 1px solid var(--paper-line);
  border-radius: var(--radius);
  overflow: hidden;
  background: var(--about-paper-raised);
}

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

.page-about .chapter__figure figcaption {
  padding: 0.7rem 1rem;
  border-top: 1px solid var(--paper-line);
  font-size: 0.8125rem;
  line-height: 1.6;
  color: var(--ink-text-soft);
}

/* ---------- 流程 ---------- */

.page-about .flow-steps {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 0.75rem;
  margin: 1.75rem 0;
  padding: 0;
  list-style: none;
}

.page-about .flow-step {
  padding: 1rem 1.1rem 1.1rem;
  border-left: 3px solid var(--aurora-violet);
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  background: rgba(255, 255, 255, 0.6);
}

.page-about .flow-step:nth-child(2) {
  border-left-color: var(--neon-cyan);
}

.page-about .flow-step:nth-child(3) {
  border-left-color: var(--signal-amber);
}

.page-about .flow-step:nth-child(4) {
  border-left-color: var(--signal-green);
}

.page-about .flow-step__num {
  display: block;
  margin-bottom: 0.35rem;
  font-size: 0.6875rem;
  letter-spacing: 0.16em;
  color: var(--ink-text-soft);
}

.page-about .flow-step__title {
  margin: 0 0 0.4rem;
  font-size: 1.0625rem;
  font-weight: 700;
  color: var(--ink-text);
}

.page-about .flow-step p {
  margin: 0;
  font-size: 0.875rem;
  line-height: 1.7;
  color: var(--ink-text-soft);
}

/* ---------- 状态卡 ---------- */

.page-about .status-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 0.6rem;
  margin: 1.25rem 0 0;
  padding: 0;
  list-style: none;
}

.page-about .status-card {
  display: grid;
  gap: 0.45rem;
  padding: 0.9rem 1rem;
  border: 1px solid var(--paper-line);
  border-radius: var(--radius-sm);
  background: var(--about-paper-raised);
}

.page-about .status-card__head {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--ink-text);
}

.page-about .status-card__body {
  font-size: 0.8125rem;
  line-height: 1.65;
  color: var(--ink-text-soft);
}

.page-about .dot--slate {
  background: var(--slate-dim);
}

/* ---------- 团队 ---------- */

.page-about .team-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 0.75rem;
  margin: 1.75rem 0;
}

.page-about .team-card {
  padding: 1.1rem 1.15rem 1.25rem;
  border: 1px solid rgba(43, 227, 218, 0.24);
  border-radius: var(--radius);
  background: var(--ink-950);
}

.page-about .team-card__role {
  margin: 0 0 0.5rem;
  font-size: 0.8125rem;
  font-weight: 700;
  letter-spacing: 0.14em;
  color: var(--neon-cyan);
}

.page-about .team-card__text {
  margin: 0;
  font-size: 0.875rem;
  line-height: 1.75;
  color: var(--slate-body);
}

/* ---------- 阶段刻度 ---------- */

.page-about .era-list {
  position: relative;
  margin: 1.75rem 0 0;
  padding: 0 0 0 1.5rem;
  list-style: none;
}

.page-about .era-list::before {
  content: "";
  position: absolute;
  left: 5px;
  top: 0.7rem;
  bottom: 0.7rem;
  width: 2px;
  background: var(--paper-line);
}

.page-about .era {
  position: relative;
  padding-bottom: 1.75rem;
}

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

.page-about .era::before {
  content: "";
  position: absolute;
  left: -1.5rem;
  top: 0.4rem;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--content-paper);
  border: 2px solid var(--neon-cyan);
}

.page-about .era:nth-child(2)::before {
  border-color: var(--aurora-violet);
}

.page-about .era:nth-child(3)::before {
  border-color: var(--signal-amber);
}

.page-about .era__mark {
  display: inline-block;
  margin: 0 0 0.5rem;
  padding: 0.2rem 0.6rem;
  border-radius: var(--radius-sm);
  background: var(--ink-950);
  color: var(--neon-cyan);
  font-size: 0.75rem;
  letter-spacing: 0.08em;
}

.page-about .era__text {
  margin: 0;
  max-width: 64ch;
  font-size: 1rem;
  line-height: 1.8;
  color: var(--ink-text-soft);
}

/* ---------- 数据带 ---------- */

.page-about .data-band {
  position: relative;
  background: var(--ink-950);
  color: var(--slate-body);
  padding-block: clamp(2.5rem, 6vw, 4.5rem);
  overflow: hidden;
  scroll-margin-top: 5rem;
}

.page-about .data-band::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(168, 193, 224, 0.06) 1px, transparent 1px),
    linear-gradient(90deg, rgba(168, 193, 224, 0.06) 1px, transparent 1px);
  background-size: 48px 48px;
  pointer-events: none;
}

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

.page-about .data-band .eyebrow {
  color: var(--neon-cyan);
}

.page-about .data-band__title {
  margin: 0.35rem 0 0;
  color: #fff;
}

.page-about .metric-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1px;
  margin-top: clamp(1.5rem, 4vw, 2.5rem);
  background: var(--line-dark);
  border: 1px solid var(--line-dark);
  border-radius: var(--radius);
  overflow: hidden;
}

.page-about .metric {
  display: grid;
  align-content: start;
  gap: 0.4rem;
  padding: 1.35rem 1.25rem 1.5rem;
  background: var(--panel-800);
  transition: background 220ms var(--ease);
}

.page-about .metric:hover {
  background: var(--panel-700);
}

.page-about .metric__num {
  font-size: clamp(1.75rem, 3.4vw, 2.375rem);
  font-weight: 700;
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--neon-cyan);
}

.page-about .metric:nth-child(3n + 2) .metric__num {
  color: var(--signal-amber);
}

.page-about .metric:nth-child(3n + 3) .metric__num {
  color: var(--aurora-violet);
}

.page-about .metric__label {
  font-size: 0.9375rem;
  font-weight: 600;
  color: #fff;
}

.page-about .metric__note {
  font-size: 0.8125rem;
  line-height: 1.6;
  color: var(--mist-blue);
}

/* ---------- 出口条 ---------- */

.page-about .exit-strip {
  background: var(--paper-soft);
  color: var(--ink-text);
  padding-block: clamp(2rem, 5vw, 3.25rem);
  border-top: 1px solid var(--paper-line);
}

.page-about .exit-strip__inner {
  display: grid;
  gap: 1.5rem;
}

.page-about .exit-strip__title {
  margin: 0 0 0.5rem;
  font-size: clamp(1.375rem, 2.8vw, 1.875rem);
  font-weight: 800;
  letter-spacing: -0.02em;
  color: var(--ink-text);
}

.page-about .exit-strip__lede {
  margin: 0;
  max-width: 56ch;
  font-size: 1rem;
  line-height: 1.75;
  color: var(--ink-text-soft);
}

.page-about .exit-strip__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.6rem;
}

.page-about .exit-strip__actions .btn--ghost {
  color: var(--ink-text);
  border-color: var(--ink-text);
  background: transparent;
}

/* ---------- 响应式 ---------- */

@media (max-width: 560px) {
  .page-about .about-cover__facts {
    flex-direction: column;
    gap: 0.5rem;
    border-radius: var(--radius);
    padding: 1rem 1.15rem;
  }

  .page-about .chapter__head {
    gap: 0.7rem;
  }

  .page-about .chapter__num {
    min-width: 2.5rem;
    height: 2.1rem;
    font-size: 0.8125rem;
  }
}

@media (min-width: 680px) {
  .page-about .dim-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

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

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

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

@media (min-width: 900px) {
  .page-about .exit-strip__inner {
    grid-template-columns: minmax(0, 1fr) auto;
    align-items: center;
    gap: 2.5rem;
  }
}

@media (min-width: 1000px) {
  .page-about .about-grid {
    grid-template-columns: var(--about-rail) minmax(0, 1fr);
    gap: var(--about-gap);
  }

  .page-about .about-rail {
    position: sticky;
    top: 7rem;
    align-self: start;
  }

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