.page-about {
  background: var(--concrete);
  color: var(--ink);
  font-family: var(--font-sans);
  overflow-x: hidden;
}

.page-about img {
  max-width: 100%;
  height: auto;
  display: block;
}

.page-about .about-text-link {
  display: inline-block;
  color: var(--pitch);
  font-weight: 600;
  font-size: 15px;
  text-decoration: none;
  border-bottom: 2px solid var(--volt);
  padding-bottom: 2px;
  transition: color .2s ease, border-color .2s ease;
}

.page-about .about-text-link:hover,
.page-about .about-text-link:focus-visible {
  color: var(--deep);
  border-color: var(--cyan);
}

.page-about .about-inline-link {
  margin: 14px 0 0;
}

/* ---------- 首屏 ---------- */

.page-about .about-hero {
  position: relative;
  padding: clamp(24px, 5vw, 52px) 0 clamp(36px, 6vw, 72px);
  background:
    linear-gradient(112deg, rgba(11, 26, 42, .06) 0%, rgba(11, 26, 42, 0) 46%),
    var(--concrete);
  border-bottom: 1px solid var(--line);
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: 0;
  width: clamp(90px, 22vw, 260px);
  height: 5px;
  background: var(--volt);
}

.page-about .about-hero-inner {
  display: grid;
  gap: clamp(26px, 4vw, 44px);
  align-items: start;
}

.page-about .about-title {
  font-family: var(--font-serif);
  font-size: clamp(30px, 5.6vw, 56px);
  line-height: 1.18;
  letter-spacing: .01em;
  margin: 12px 0 16px;
  max-width: 20ch;
}

.page-about .about-lede {
  max-width: 62ch;
  font-size: clamp(15px, 1.6vw, 17px);
  line-height: 1.85;
  color: #26302c;
  margin: 0;
}

.page-about .about-hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: clamp(18px, 3vw, 28px);
}

.page-about .about-hero-card {
  background: var(--night);
  color: var(--paper);
  padding: clamp(20px, 3.4vw, 32px);
  border-top: 4px solid var(--pitch);
  clip-path: polygon(0 0, calc(100% - 22px) 0, 100% 22px, 100% 100%, 0 100%);
}

.page-about .about-card-kicker {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .18em;
  text-transform: uppercase;
  color: var(--cyan);
}

.page-about .about-figures {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 20px 14px;
  margin: 16px 0 0;
}

.page-about .about-metric {
  display: flex;
  flex-direction: column-reverse;
  gap: 4px;
}

.page-about .about-fig {
  margin: 0;
  font-family: var(--font-cond);
  font-size: clamp(30px, 4.4vw, 42px);
  line-height: 1;
  letter-spacing: .01em;
  color: var(--volt);
}

.page-about .about-fig span {
  font-size: .5em;
  margin-left: 2px;
  color: rgba(200, 255, 61, .8);
}

.page-about .about-fig-label {
  font-size: 12px;
  letter-spacing: .04em;
  color: rgba(245, 246, 240, .68);
}

/* ---------- 版面通用 ---------- */

.page-about .section-head {
  max-width: 720px;
  margin-bottom: clamp(24px, 4vw, 40px);
}

.page-about .section-head .lede {
  color: #3a443f;
  line-height: 1.8;
}

/* ---------- 历程 ---------- */

.page-about .about-story {
  background: var(--paper);
}

.page-about .about-story-grid {
  display: grid;
  gap: 26px;
}

.page-about .about-rail {
  border-top: 2px solid var(--deep);
  padding-top: 12px;
}

.page-about .about-rail-label {
  margin: 0;
  font-size: 11px;
  letter-spacing: .18em;
  text-transform: uppercase;
  color: var(--gray);
}

.page-about .about-rail-list {
  display: flex;
  flex-wrap: wrap;
  gap: 4px 16px;
  list-style: none;
  margin: 10px 0 12px;
  padding: 0;
}

.page-about .about-rail-link {
  display: inline-flex;
  align-items: baseline;
  gap: 7px;
  font-size: 13px;
  color: var(--gray);
  text-decoration: none;
  padding: 4px 0;
  border-bottom: 1px dashed var(--line);
  transition: color .2s ease, border-color .2s ease;
}

.page-about .about-rail-link .mono {
  color: var(--deep);
  font-weight: 700;
}

.page-about .about-rail-link:hover,
.page-about .about-rail-link:focus-visible {
  color: var(--pitch);
  border-bottom-color: var(--volt);
}

.page-about .about-top-link {
  display: inline-block;
  margin-top: 10px;
  font-size: 12px;
  color: var(--gray);
  text-decoration: none;
  border-bottom: 1px dashed var(--line-strong);
}

.page-about .about-top-link:hover {
  color: var(--pitch);
}

.page-about .epoch {
  position: relative;
  padding: 0 0 26px 22px;
  border-left: 2px solid var(--line);
  margin-bottom: 26px;
}

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

.page-about .epoch::before {
  content: "";
  position: absolute;
  left: -7px;
  top: 6px;
  width: 12px;
  height: 12px;
  background: var(--paper);
  border: 2px solid var(--pitch);
  transform: rotate(45deg);
}

.page-about .epoch--now::before {
  background: var(--volt);
  border-color: var(--deep);
}

.page-about .epoch-year {
  margin: 0 0 6px;
  font-family: var(--font-mono);
  font-size: clamp(22px, 3vw, 30px);
  font-weight: 700;
  letter-spacing: .06em;
  color: var(--deep);
}

.page-about .epoch-title {
  font-family: var(--font-serif);
  font-size: clamp(19px, 2.4vw, 25px);
  line-height: 1.45;
  margin: 0 0 10px;
}

.page-about .epoch p {
  margin: 0 0 12px;
  font-size: 15px;
  line-height: 1.85;
  color: #26302c;
}

.page-about .about-figure-media {
  margin: 18px 0 0;
}

/* ---------- 生产节奏 ---------- */

.page-about .about-method-grid {
  display: grid;
  gap: 28px;
  align-items: start;
}

.page-about .method-steps {
  list-style: none;
  margin: 22px 0 0;
  padding: 0;
  display: grid;
  gap: 12px;
}

.page-about .method-step {
  display: grid;
  gap: 6px;
  background: var(--paper);
  border-left: 3px solid var(--pitch);
  padding: 14px 16px;
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 12px), calc(100% - 12px) 100%, 0 100%);
  transition: border-color .2s ease, transform .2s ease;
}

.page-about .method-step:hover {
  border-left-color: var(--volt);
}

.page-about .method-time {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .04em;
  color: var(--deep);
}

.page-about .method-step h3 {
  margin: 0 0 5px;
  font-size: 16px;
  font-weight: 700;
  line-height: 1.5;
}

.page-about .method-step p {
  margin: 0;
  font-size: 14px;
  line-height: 1.75;
  color: var(--gray);
}

.page-about .about-note {
  margin: 18px 0 0;
  padding-left: 12px;
  border-left: 3px solid var(--line-strong);
  font-size: 13px;
  line-height: 1.8;
  color: var(--gray);
}

.page-about .about-method-media {
  margin: 0;
}

.page-about .media-cap {
  margin-top: 10px;
  font-size: 12px;
  line-height: 1.7;
  color: var(--gray);
}

/* ---------- 团队 ---------- */

.page-about .about-team {
  background: var(--night);
  color: var(--paper);
}

.page-about .about-team .eyebrow {
  color: var(--volt);
}

.page-about .about-team .display {
  color: var(--paper);
}

.page-about .about-team .lede {
  color: rgba(245, 246, 240, .76);
}

.page-about .team-figures {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 10px;
  margin-bottom: clamp(26px, 4vw, 38px);
}

.page-about .team-figure {
  background: var(--night-2);
  border-top: 2px solid var(--volt);
  padding: 14px 16px;
  display: flex;
  flex-direction: column-reverse;
  gap: 4px;
}

.page-about .team-figure .stat-num {
  font-family: var(--font-cond);
  font-size: clamp(32px, 4.6vw, 48px);
  line-height: 1;
  color: var(--volt);
}

.page-about .team-figure .stat-label {
  font-size: 12px;
  color: rgba(245, 246, 240, .7);
}

.page-about .team-split {
  display: grid;
  gap: 26px;
  align-items: start;
}

.page-about .team-diagram-label {
  margin: 0 0 10px;
  font-size: 11px;
  letter-spacing: .14em;
  text-transform: uppercase;
  color: var(--cyan);
}

.page-about .team-diagram {
  width: 100%;
  height: auto;
  display: block;
}

.page-about .diagram-node rect {
  fill: var(--night-2);
  stroke: rgba(245, 246, 240, .24);
  stroke-width: 1.5;
  transition: fill .2s ease, stroke .2s ease;
}

.page-about .diagram-node text {
  fill: var(--paper);
  font-family: var(--font-sans);
  font-size: 15px;
}

.page-about .diagram-node .diagram-sub {
  fill: rgba(245, 246, 240, .6);
  font-family: var(--font-mono);
  font-size: 12px;
}

.page-about .diagram-node:hover rect,
.page-about .diagram-node:focus-within rect {
  fill: var(--volt);
  stroke: var(--volt);
}

.page-about .diagram-node:hover text,
.page-about .diagram-node:focus-within text {
  fill: var(--night);
}

.page-about .diagram-node:hover .diagram-sub,
.page-about .diagram-node:focus-within .diagram-sub {
  fill: rgba(11, 26, 42, .72);
}

.page-about .diagram-line {
  stroke: rgba(200, 255, 61, .55);
  stroke-width: 1.5;
  fill: none;
}

.page-about .team-diagram-cap {
  margin: 10px 0 0;
  font-size: 12px;
  line-height: 1.75;
  color: rgba(245, 246, 240, .6);
}

.page-about .team-item {
  border-bottom: 1px solid rgba(245, 246, 240, .16);
  padding: 12px 0;
}

.page-about .team-item summary {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: 12px;
  list-style: none;
  cursor: pointer;
  font-size: 15px;
  font-weight: 600;
  color: var(--paper);
}

.page-about .team-item summary::-webkit-details-marker {
  display: none;
}

.page-about .team-item summary:hover {
  color: var(--volt);
}

.page-about .team-item-hint {
  font-size: 11px;
  letter-spacing: .1em;
  color: var(--cyan);
}

.page-about .team-item p {
  margin: 8px 0 0;
  font-size: 14px;
  line-height: 1.8;
  color: rgba(245, 246, 240, .72);
}

.page-about .review-quote {
  margin: clamp(26px, 4vw, 40px) 0 0;
  padding: clamp(18px, 3vw, 28px);
  background: var(--deep);
  border-left: 4px solid var(--volt);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 16px), calc(100% - 16px) 100%, 0 100%);
}

.page-about .review-quote p {
  margin: 0 0 10px;
  font-family: var(--font-serif);
  font-size: clamp(16px, 1.9vw, 19px);
  line-height: 1.8;
  color: var(--paper);
}

.page-about .review-quote cite {
  font-style: normal;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .12em;
  color: var(--volt);
}

/* ---------- 共建与覆盖 ---------- */

.page-about .about-network {
  background: var(--paper);
}

.page-about .network-grid {
  display: grid;
  gap: 28px;
  align-items: start;
}

.page-about .network-copy .lede {
  color: #3a443f;
  line-height: 1.85;
}

.page-about .network-copy p {
  font-size: 15px;
  line-height: 1.85;
  color: #26302c;
}

.page-about .network-stats {
  list-style: none;
  margin: 22px 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 10px;
}

.page-about .network-stat {
  background: var(--concrete);
  border: 1px solid var(--line);
  border-top: 3px solid var(--pitch);
  padding: 14px;
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 12px), calc(100% - 12px) 100%, 0 100%);
}

.page-about .network-stat b {
  display: block;
  font-family: var(--font-cond);
  font-size: clamp(26px, 3.4vw, 36px);
  line-height: 1.1;
  color: var(--deep);
}

.page-about .network-stat span {
  display: block;
  margin-top: 4px;
  font-size: 12px;
  line-height: 1.6;
  color: var(--gray);
}

.page-about .about-network-media {
  margin: 0;
}

/* ---------- 运营主体 ---------- */

.page-about .about-entity {
  background: var(--concrete-deep);
}

.page-about .entity-panel {
  display: grid;
  gap: 24px;
  background: var(--paper);
  border-left: 6px solid var(--deep);
  padding: clamp(20px, 4vw, 36px);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 18px), calc(100% - 18px) 100%, 0 100%);
}

.page-about .entity-copy p {
  margin: 0 0 12px;
  font-size: 15px;
  line-height: 1.85;
  color: #26302c;
}

.page-about .entity-facts {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 10px;
  align-content: start;
}

.page-about .entity-facts li {
  font-size: 14px;
  line-height: 1.7;
  border-bottom: 1px dashed var(--line);
  padding-bottom: 8px;
}

.page-about .entity-facts .mono {
  display: block;
  font-size: 11px;
  letter-spacing: .1em;
  color: var(--gray);
  margin-bottom: 2px;
}

/* ---------- 收束 ---------- */

.page-about .about-cta {
  background: var(--night);
  color: var(--paper);
  padding: clamp(36px, 6vw, 64px) 0;
  border-bottom: 6px solid var(--pitch);
}

.page-about .about-cta-inner {
  display: grid;
  gap: 22px;
  align-items: center;
}

.page-about .about-cta .display {
  color: var(--paper);
  margin: 0 0 8px;
}

.page-about .about-cta-copy p {
  margin: 0;
  max-width: 52ch;
  font-size: 15px;
  line-height: 1.8;
  color: rgba(245, 246, 240, .76);
}

.page-about .about-cta-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  --btn-bd: rgba(245, 246, 240, .42);
}

.page-about .about-cta-actions .btn-ghost {
  color: var(--paper);
  border-color: rgba(245, 246, 240, .42);
}

.page-about .about-cta-actions .btn-ghost:hover {
  border-color: var(--cyan);
  color: var(--cyan);
}

/* ---------- 断点 ---------- */

@media (min-width: 640px) {
  .page-about .method-step {
    grid-template-columns: minmax(88px, 104px) minmax(0, 1fr);
    gap: 14px;
    align-items: start;
  }

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

@media (min-width: 900px) {
  .page-about .about-hero-inner {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    gap: clamp(32px, 4vw, 56px);
  }

  .page-about .about-story-grid {
    grid-template-columns: 200px minmax(0, 1fr);
    gap: clamp(32px, 4vw, 56px);
    align-items: start;
  }

  .page-about .about-rail {
    position: sticky;
    top: 92px;
  }

  .page-about .about-rail-list {
    display: block;
    margin-bottom: 16px;
  }

  .page-about .about-rail-list li {
    margin-bottom: 2px;
  }

  .page-about .about-rail-link {
    display: flex;
    width: 100%;
    border-bottom: 1px dashed var(--line);
    padding: 8px 0;
  }

  .page-about .about-method-grid {
    grid-template-columns: minmax(0, 1fr) minmax(0, 400px);
    gap: clamp(32px, 4vw, 56px);
  }

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

  .page-about .team-split {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
    gap: clamp(28px, 4vw, 48px);
  }

  .page-about .network-grid {
    grid-template-columns: minmax(0, 1.15fr) minmax(0, 1fr);
    gap: clamp(32px, 4vw, 56px);
  }

  .page-about .entity-panel {
    grid-template-columns: minmax(0, 1.5fr) minmax(0, 1fr);
    gap: clamp(24px, 4vw, 48px);
  }

  .page-about .about-cta-inner {
    grid-template-columns: minmax(0, 1fr) auto;
    gap: 32px;
  }

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

@media (prefers-reduced-motion: reduce) {
  .page-about .about-text-link,
  .page-about .about-rail-link,
  .page-about .method-step,
  .page-about .diagram-node rect {
    transition: none;
  }

  .page-about .method-step:hover {
    transform: none;
  }
}