.page-about {
  --about-ink: #101826;
  --about-ink-soft: #4d586a;
  --about-paper-line: rgba(16, 24, 38, .13);
  --about-teal: #0b7a72;
  background: var(--ink-void);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  padding: clamp(22px, 5vw, 44px) 0 clamp(38px, 7vw, 88px);
  background:
    radial-gradient(120% 78% at 88% -12%, rgba(23, 234, 217, .13), transparent 62%),
    radial-gradient(80% 60% at 0% 100%, rgba(91, 75, 138, .18), transparent 70%),
    var(--ink-void);
  border-bottom: 1px solid var(--line);
}

.page-about .breadcrumb {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .1em;
  text-transform: uppercase;
  color: var(--steel);
  margin-bottom: clamp(22px, 4vw, 40px);
}

.page-about .breadcrumb ol {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  list-style: none;
  margin: 0;
  padding: 0;
}

.page-about .breadcrumb li + li::before {
  content: "/";
  margin-right: 6px;
  color: var(--line-strong);
}

.page-about .breadcrumb a {
  color: var(--star-silver);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: border-color .2s ease, color .2s ease;
}

.page-about .breadcrumb a:hover,
.page-about .breadcrumb a:focus-visible {
  color: var(--pulse-cyan);
  border-bottom-color: var(--pulse-cyan);
}

.page-about .about-hero-grid {
  display: grid;
  gap: 26px;
  grid-template-columns: minmax(0, 1fr);
}

.page-about .about-rail {
  border-top: 1px solid var(--line);
  padding-top: 14px;
}

.page-about .about-rail-label {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: .18em;
  text-transform: uppercase;
  color: var(--steel);
}

.page-about .about-rail-list {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 18px;
  list-style: none;
  margin: 10px 0 0;
  padding: 0;
}

.page-about .about-rail-list a {
  display: inline-flex;
  align-items: baseline;
  gap: 7px;
  font-size: 13px;
  color: var(--star-silver);
  text-decoration: none;
  white-space: nowrap;
  transition: color .2s ease;
}

.page-about .about-rail-list a:hover,
.page-about .about-rail-list a:focus-visible {
  color: var(--pulse-cyan);
}

.page-about .about-rail-num {
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: .08em;
  color: var(--pulse-cyan);
}

.page-about .about-hero-main .eyebrow {
  margin-bottom: 14px;
}

.page-about .about-hero-main h1 {
  margin: 0;
  font-family: var(--font-narrow);
  font-weight: 800;
  font-size: clamp(30px, 6.6vw, 64px);
  line-height: 1.08;
  letter-spacing: -.005em;
  color: var(--white);
}

.page-about .about-hero-main .lede {
  margin: 18px 0 0;
  max-width: 62ch;
  font-size: clamp(15px, 1.6vw, 17px);
  line-height: 1.85;
  color: var(--star-silver);
}

.page-about .about-hero-stats {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(132px, 1fr));
  gap: 20px 24px;
  margin-top: clamp(26px, 4vw, 40px);
  padding-top: 22px;
  border-top: 1px solid var(--line);
}

.page-about .about-hero-stats .stat {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.page-about .about-hero-stats .stat-value {
  font-family: var(--font-mono);
  font-size: clamp(26px, 3.4vw, 38px);
  font-weight: 700;
  line-height: 1;
  letter-spacing: -.02em;
  color: var(--white);
}

.page-about .about-hero-stats .stat-value-cyan {
  color: var(--pulse-cyan);
}

.page-about .about-hero-stats .stat-value-amber {
  color: var(--amber);
}

.page-about .about-hero-stats .stat-label {
  font-size: 12px;
  letter-spacing: .04em;
  color: var(--steel);
}

/* ---------- 暖纸色阅读区 ---------- */
.page-about .paper-zone {
  background: var(--paper);
  color: var(--about-ink);
}

.page-about .paper-zone .eyebrow {
  color: var(--about-teal);
}

.page-about .paper-zone .eyebrow::before {
  background: var(--about-teal);
}

.page-about .paper-zone .section-title {
  color: #0d1626;
}

.page-about .paper-zone .lede {
  color: var(--about-ink-soft);
}

.page-about .about-origin {
  padding: clamp(40px, 7vw, 92px) 0 clamp(44px, 7vw, 96px);
  border-top: 1px solid var(--line);
}

.page-about .about-split {
  display: grid;
  gap: 22px;
  grid-template-columns: minmax(0, 1fr);
}

.page-about .about-split-narrow .section-title {
  margin: 12px 0 0;
  font-size: clamp(24px, 3.6vw, 36px);
  line-height: 1.28;
}

.page-about .about-origin .prose,
.page-about .about-origin .prose p {
  color: #2b3543;
}

.page-about .about-split-wide p {
  margin: 0 0 16px;
  font-size: 15px;
  line-height: 1.9;
}

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

.page-about .about-origin-figure {
  margin: clamp(28px, 5vw, 46px) 0 0;
  border: 1px solid var(--about-paper-line);
  background: #e6ddcb;
}

.page-about .about-audience {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 0;
  margin-top: clamp(30px, 5vw, 48px);
  border-top: 1px solid var(--about-paper-line);
}

.page-about .about-audience-item {
  padding: 22px 0;
  border-bottom: 1px solid var(--about-paper-line);
}

.page-about .about-audience-item h3 {
  margin: 0 0 8px;
  font-family: var(--font-narrow);
  font-size: 17px;
  font-weight: 700;
  letter-spacing: .01em;
  color: #0d1626;
}

.page-about .about-audience-item p {
  margin: 0;
  font-size: 14px;
  line-height: 1.85;
  color: var(--about-ink-soft);
}

/* ---------- 团队 ---------- */
.page-about .about-team {
  padding: clamp(40px, 7vw, 92px) 0;
  background: var(--ink-deep);
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}

.page-about .about-team .section-head {
  max-width: 74ch;
}

.page-about .about-team-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(26px, 4vw, 46px);
  margin-top: clamp(30px, 5vw, 52px);
}

.page-about .about-team-figure {
  border: 1px solid var(--line-strong);
  background: #0f1729;
  margin: 0;
}

.page-about .about-roles {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 14px;
}

.page-about .about-role {
  position: relative;
  padding: 20px 20px 20px 22px;
  background: rgba(255, 255, 255, .02);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  transition: border-color .22s ease, transform .22s ease, background .22s ease;
}

.page-about .about-role::before {
  content: "";
  position: absolute;
  left: 0;
  top: 18px;
  bottom: 18px;
  width: 2px;
  background: var(--line-strong);
  transition: background .22s ease;
}

.page-about .about-role:hover,
.page-about .about-role:focus-within {
  border-color: rgba(23, 234, 217, .42);
  background: rgba(23, 234, 217, .05);
  transform: translateY(-2px);
}

.page-about .about-role:hover::before,
.page-about .about-role:focus-within::before {
  background: var(--pulse-cyan);
}

.page-about .about-role-index {
  display: block;
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: .16em;
  color: var(--pulse-cyan);
  margin-bottom: 8px;
}

.page-about .about-role-title {
  margin: 0 0 8px;
  font-family: var(--font-narrow);
  font-size: 17px;
  font-weight: 700;
  color: var(--white);
}

.page-about .about-role-body {
  margin: 0;
  font-size: 13.5px;
  line-height: 1.8;
  color: var(--star-silver);
}

/* ---------- 发展历程 ---------- */
.page-about .about-roadmap {
  padding: clamp(40px, 7vw, 92px) 0;
  background:
    linear-gradient(180deg, rgba(91, 75, 138, .10), transparent 40%),
    var(--ink-void);
}

.page-about .about-roadmap .section-head {
  max-width: 72ch;
}

.page-about .about-timeline {
  margin-top: clamp(32px, 5vw, 56px);
}

.page-about .timeline-item {
  padding-bottom: clamp(26px, 3.4vw, 38px);
}

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

.page-about .timeline-meta {
  margin: 0 0 6px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .14em;
  text-transform: uppercase;
  color: var(--steel);
  transition: color .3s ease;
}

.page-about .timeline-title {
  margin: 0 0 8px;
  font-family: var(--font-narrow);
  font-size: clamp(18px, 2.2vw, 22px);
  font-weight: 700;
  line-height: 1.35;
  color: var(--white);
}

.page-about .timeline-body {
  margin: 0;
  max-width: 68ch;
  font-size: 14px;
  line-height: 1.85;
  color: var(--star-silver);
}

.page-about .timeline-item[data-active="true"] .timeline-meta {
  color: var(--pulse-cyan);
}

/* ---------- 资质荣誉 ---------- */
.page-about .about-honors {
  padding: clamp(40px, 7vw, 92px) 0;
  border-top: 1px solid var(--line);
}

.page-about .about-honors .section-head {
  max-width: 66ch;
}

.page-about .about-honor-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 0;
  margin-top: clamp(28px, 4.5vw, 48px);
  border-top: 1px solid var(--about-paper-line);
}

.page-about .about-honor {
  padding: 24px 0;
  border-bottom: 1px solid var(--about-paper-line);
}

.page-about .about-honor-num {
  margin: 0 0 6px;
  font-family: var(--font-mono);
  font-size: clamp(22px, 2.8vw, 30px);
  font-weight: 700;
  line-height: 1.1;
  letter-spacing: -.01em;
  color: #b0781a;
}

.page-about .about-honor-num span {
  font-size: 12px;
  font-weight: 500;
  letter-spacing: .08em;
  margin-left: 4px;
  color: var(--about-ink-soft);
}

.page-about .about-honor-title {
  margin: 0 0 8px;
  font-family: var(--font-narrow);
  font-size: 16px;
  font-weight: 700;
  color: #0d1626;
}

.page-about .about-honor p:last-child {
  margin: 0;
  font-size: 13.5px;
  line-height: 1.8;
  color: var(--about-ink-soft);
}

/* ---------- 合作生态 ---------- */
.page-about .about-eco {
  padding: clamp(40px, 7vw, 92px) 0;
  background: var(--ink-deep);
}

.page-about .about-eco .section-head {
  max-width: 72ch;
}

.page-about .about-eco-list {
  margin-top: clamp(26px, 4vw, 42px);
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 12px;
}

.page-about .about-eco-list .disclosure {
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: rgba(255, 255, 255, .02);
  transition: border-color .22s ease, background .22s ease;
}

.page-about .about-eco-list .disclosure[open] {
  border-color: rgba(23, 234, 217, .38);
  background: rgba(23, 234, 217, .04);
}

.page-about .about-eco-list summary {
  cursor: pointer;
  padding: 16px 18px;
  font-family: var(--font-narrow);
  font-size: 15.5px;
  font-weight: 700;
  letter-spacing: .01em;
  color: var(--white);
  list-style: none;
}

.page-about .about-eco-list summary::-webkit-details-marker {
  display: none;
}

.page-about .about-eco-list summary::after {
  content: "+";
  float: right;
  font-family: var(--font-mono);
  font-size: 16px;
  color: var(--pulse-cyan);
  transition: transform .22s ease;
}

.page-about .about-eco-list .disclosure[open] summary::after {
  content: "–";
}

.page-about .about-eco-list summary:focus-visible {
  outline: 2px solid var(--pulse-cyan);
  outline-offset: -2px;
}

.page-about .about-eco-list .disclosure-body {
  padding: 0 18px 18px;
}

.page-about .about-eco-list .disclosure-body p {
  margin: 0;
  font-size: 14px;
  line-height: 1.85;
  color: var(--star-silver);
}

/* ---------- 河北本地 ---------- */
.page-about .about-hebei {
  padding: clamp(40px, 7vw, 92px) 0;
  background:
    radial-gradient(90% 70% at 100% 0%, rgba(23, 234, 217, .09), transparent 60%),
    var(--ink-void);
  border-top: 1px solid var(--line);
}

.page-about .about-hebei-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(26px, 4vw, 46px);
  align-items: center;
}

.page-about .about-hebei-figure {
  margin: 0;
  border: 1px solid var(--line-strong);
  background: #0f1729;
}

.page-about .about-hebei-text .section-title {
  margin: 12px 0 16px;
  font-size: clamp(24px, 3.4vw, 34px);
  line-height: 1.28;
}

.page-about .about-hebei-text .prose {
  margin: 0 0 22px;
  font-size: 15px;
  line-height: 1.9;
  color: var(--star-silver);
}

.page-about .about-hebei-points {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 12px;
}

.page-about .about-hebei-points li {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  font-size: 14px;
  line-height: 1.75;
  color: var(--star-silver);
}

.page-about .about-point-dot {
  flex: none;
  margin-top: 7px;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--pulse-cyan);
  box-shadow: 0 0 0 3px rgba(23, 234, 217, .14);
}

/* ---------- 收尾行动区 ---------- */
.page-about .about-cta {
  padding: clamp(38px, 6vw, 76px) 0;
  background: var(--ink-deep);
  border-top: 1px solid var(--line);
}

.page-about .about-cta-inner {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 24px;
  padding: clamp(24px, 4vw, 40px);
  border: 1px solid var(--line-strong);
  border-radius: var(--radius);
  background:
    linear-gradient(120deg, rgba(23, 234, 217, .08), rgba(91, 75, 138, .10) 60%, transparent),
    rgba(255, 255, 255, .015);
}

.page-about .about-cta-title {
  margin: 0 0 10px;
  font-family: var(--font-narrow);
  font-size: clamp(21px, 3vw, 30px);
  font-weight: 800;
  line-height: 1.3;
  color: var(--white);
}

.page-about .about-cta-text {
  margin: 0;
  max-width: 60ch;
  font-size: 14.5px;
  line-height: 1.85;
  color: var(--star-silver);
}

.page-about .about-cta-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  align-items: center;
}

/* ---------- 响应式 ---------- */
@media (min-width: 640px) {
  .page-about .about-audience {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    column-gap: clamp(20px, 3vw, 38px);
  }

  .page-about .about-honor-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    column-gap: clamp(20px, 3vw, 38px);
  }

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

@media (min-width: 880px) {
  .page-about .about-split {
    grid-template-columns: minmax(0, 4fr) minmax(0, 7fr);
    gap: clamp(32px, 4.5vw, 58px);
    align-items: start;
  }

  .page-about .about-split-narrow {
    position: sticky;
    top: calc(var(--header-h) + 28px);
  }

  .page-about .about-team-grid {
    grid-template-columns: minmax(0, 5fr) minmax(0, 6fr);
    align-items: start;
  }

  .page-about .about-team-figure {
    position: sticky;
    top: calc(var(--header-h) + 28px);
  }

  .page-about .about-hebei-grid {
    grid-template-columns: minmax(0, 8fr) minmax(0, 5fr);
    gap: clamp(30px, 4.5vw, 56px);
  }

  .page-about .about-cta-inner {
    grid-template-columns: minmax(0, 7fr) minmax(0, 4fr);
    align-items: center;
    gap: clamp(20px, 3vw, 40px);
  }

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

@media (min-width: 960px) {
  .page-about .about-hero-grid {
    grid-template-columns: 190px minmax(0, 1fr);
    gap: clamp(36px, 5vw, 64px);
    align-items: start;
  }

  .page-about .about-rail {
    border-top: 0;
    border-left: 1px solid var(--line-strong);
    padding: 4px 0 4px 16px;
    position: sticky;
    top: calc(var(--header-h) + 26px);
  }

  .page-about .about-rail-list {
    flex-direction: column;
    gap: 13px;
  }

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

@media (prefers-reduced-motion: reduce) {
  .page-about .about-role,
  .page-about .about-eco-list .disclosure,
  .page-about .about-eco-list summary::after,
  .page-about .timeline-meta {
    transition: none;
  }

  .page-about .about-role:hover,
  .page-about .about-role:focus-within {
    transform: none;
  }
}