.page-about {
  --about-pad: clamp(2.5rem, 6vw, 5rem);
  --about-gap: clamp(1.25rem, 4vw, 3rem);
  --about-line: var(--line-200);
  background: var(--paper-050);
  color: var(--ink-900);
  overflow-x: clip;
}

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

.page-about .about-crumb-wrap {
  padding-top: 1rem;
}

.page-about .breadcrumbs {
  font-size: 0.875rem;
  color: var(--slate-500);
}

.page-about .breadcrumb-list {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  align-items: center;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .breadcrumb-list li + li::before {
  content: "/";
  margin-right: 0.5rem;
  color: var(--line-200);
}

.page-about .breadcrumb-list a {
  color: var(--jade-600);
  text-decoration: none;
}

.page-about .breadcrumb-list a:hover {
  text-decoration: underline;
  text-underline-offset: 3px;
}

/* ---------- 首屏 ---------- */

.page-about .about-hero {
  padding: clamp(1.25rem, 3vw, 2.25rem) 0 clamp(2rem, 5vw, 4rem);
}

.page-about .about-hero-grid {
  display: grid;
  gap: var(--about-gap);
  align-items: start;
}

.page-about .eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 0.6rem;
  margin: 0 0 1rem;
  font-family: var(--font-sans);
  font-size: 0.875rem;
  letter-spacing: 0.04em;
  color: var(--jade-600);
}

.page-about .eyebrow::before {
  content: "";
  width: 28px;
  height: 1px;
  background: var(--gold-500);
}

.page-about h1 {
  margin: 0 0 1.15rem;
  font-family: var(--font-display);
  font-weight: 600;
  font-size: clamp(2rem, 6.4vw, 3.5rem);
  line-height: 1.16;
  letter-spacing: -0.02em;
  color: var(--ink-900);
  text-wrap: balance;
}

.page-about .lede {
  margin: 0;
  font-size: clamp(0.9375rem, 1.6vw, 1.0625rem);
  line-height: 1.85;
  color: var(--ink-900);
  max-width: 46em;
}

.page-about .hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin-top: 1.75rem;
}

.page-about .about-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 44px;
  padding: 0.7rem 1.3rem;
  border: 1px solid transparent;
  border-radius: var(--radius-sm);
  font-family: var(--font-sans);
  font-size: 0.9375rem;
  font-weight: 500;
  letter-spacing: -0.01em;
  text-decoration: none;
  transition: background-color 180ms var(--ease), color 180ms var(--ease), border-color 180ms var(--ease);
}

.page-about .about-btn--ink {
  background: var(--ink-900);
  color: var(--paper-050);
}

.page-about .about-btn--ink:hover {
  background: var(--ink-700);
}

.page-about .about-btn--line {
  border-color: var(--line-200);
  color: var(--ink-900);
  background: transparent;
}

.page-about .about-btn--line:hover {
  border-color: var(--gold-500);
  color: var(--jade-600);
}

.page-about .about-btn--solid {
  background: var(--paper-050);
  color: var(--ink-900);
}

.page-about .about-btn--solid:hover {
  background: var(--gold-100);
}

.page-about .about-btn--orange {
  border-color: var(--orange-600);
  color: var(--paper-050);
  background: transparent;
}

.page-about .about-btn--orange:hover {
  background: var(--orange-600);
  color: var(--paper-050);
}

.page-about .about-btn:focus-visible,
.page-about .about-index a:focus-visible,
.page-about summary:focus-visible,
.page-about .structure-list a:focus-visible {
  outline: 2px solid var(--gold-500);
  outline-offset: 4px;
}

.page-about .hero-facts {
  margin: 0;
  border: 1px solid var(--about-line);
  background: var(--gold-100);
  border-radius: var(--radius-sm);
  box-shadow: var(--shadow-1);
}

.page-about .fact {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 1rem;
  padding: 0.9rem 1rem;
  border-bottom: 1px solid rgba(200, 150, 62, 0.28);
}

.page-about .fact:last-child {
  border-bottom: 0;
}

.page-about .fact dt {
  font-size: 0.9375rem;
  color: var(--ink-700);
  letter-spacing: 0.02em;
}

.page-about .fact dd {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 0.9375rem;
  color: var(--ink-900);
  text-align: right;
}

.page-about .about-index {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-top: 1rem;
}

.page-about .about-index a {
  display: inline-flex;
  align-items: center;
  min-height: 44px;
  padding: 0 0.7rem;
  border: 1px solid var(--about-line);
  border-radius: 999px;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--ink-700);
  text-decoration: none;
  transition: border-color 180ms var(--ease), color 180ms var(--ease);
}

.page-about .about-index a:hover {
  border-color: var(--gold-500);
  color: var(--jade-600);
}

/* ---------- 通用章节 ---------- */

.page-about .about-section {
  padding: var(--about-pad) 0;
}

.page-about .sec-num {
  margin: 0 0 0.75rem;
  font-family: var(--font-display);
  font-weight: 600;
  font-size: clamp(2rem, 5vw, 2.75rem);
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--gold-500);
}

.page-about .section-title {
  margin: 0 0 1rem;
  font-family: var(--font-display);
  font-weight: 600;
  font-size: clamp(1.4rem, 3.6vw, 2.125rem);
  line-height: 1.3;
  letter-spacing: -0.02em;
  color: var(--ink-900);
}

.page-about .meta-mono {
  margin: 1.5rem 0 0;
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  letter-spacing: 0.02em;
  color: var(--slate-500);
}

.page-about .sec-head {
  max-width: 52rem;
}

.page-about .sec-head .lede {
  margin-top: 0.25rem;
}

/* ---------- 起点 ---------- */

.page-about .origin-grid {
  display: grid;
  gap: var(--about-gap);
  align-items: start;
}

.page-about .origin-text p {
  margin: 0 0 1.1rem;
  font-size: 1rem;
  line-height: 1.8;
  color: var(--ink-900);
}

.page-about .origin-figure {
  margin: 0;
  border: 1px solid var(--about-line);
  background: var(--paper-050);
  box-shadow: var(--shadow-1);
}

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

.page-about .origin-figure figcaption,
.page-about .network-figure figcaption {
  padding: 0.7rem 0.9rem;
  border-top: 1px solid var(--about-line);
  font-size: 0.8125rem;
  line-height: 1.6;
  color: var(--ink-700);
}

/* ---------- 时间线（深色带） ---------- */

.page-about .about-band {
  background: var(--ink-900);
  color: var(--paper-050);
}

.page-about .about-band .section-title {
  color: var(--paper-050);
}

.page-about .band-head {
  display: grid;
  gap: var(--about-gap);
  align-items: end;
}

.page-about .band-lede {
  margin: 0;
  max-width: 34em;
  font-size: 0.9375rem;
  line-height: 1.8;
  color: rgba(251, 248, 242, 0.76);
}

.page-about .band-figure {
  margin: 0;
  border: 1px solid rgba(200, 150, 62, 0.35);
}

.page-about .band-figure img {
  width: 100%;
  object-fit: cover;
  opacity: 0.92;
}

.page-about .timeline {
  position: relative;
  margin-top: clamp(1.75rem, 4vw, 2.75rem);
  padding-left: 1.75rem;
}

.page-about .timeline::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.8rem;
  bottom: 0.8rem;
  width: 1px;
  background: rgba(200, 150, 62, 0.45);
}

.page-about .tl-item {
  position: relative;
  border-bottom: 1px solid rgba(251, 248, 242, 0.12);
}

.page-about .tl-item:last-child {
  border-bottom: 0;
}

.page-about .tl-item::before {
  content: "";
  position: absolute;
  left: -1.75rem;
  top: 1.85rem;
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--gold-500);
  transform: translateX(-50%);
  box-shadow: 0 0 0 4px var(--ink-900);
  transition: box-shadow 180ms var(--ease);
}

.page-about .tl-item[open]::before {
  box-shadow: 0 0 0 4px var(--ink-900), 0 0 0 5px var(--gold-500);
}

.page-about .tl-item > summary {
  display: grid;
  grid-template-columns: 2.75rem minmax(0, 1fr) 1rem;
  gap: 0.75rem;
  align-items: baseline;
  padding: 1.15rem 0;
  list-style: none;
  cursor: pointer;
}

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

.page-about .tl-item > summary::after {
  content: "+";
  grid-column: 3;
  font-family: var(--font-mono);
  font-size: 1rem;
  line-height: 1;
  color: var(--gold-500);
  text-align: right;
}

.page-about .tl-item[open] > summary::after {
  content: "−";
}

.page-about .tl-num {
  font-family: var(--font-display);
  font-weight: 600;
  font-size: clamp(1.75rem, 5vw, 3.25rem);
  line-height: 1;
  letter-spacing: -0.03em;
  color: var(--gold-500);
}

.page-about .tl-title {
  font-family: var(--font-sans);
  font-weight: 500;
  font-size: 1rem;
  line-height: 1.6;
  letter-spacing: -0.01em;
  color: var(--paper-050);
}

.page-about .tl-body {
  padding: 0 0 1.35rem;
}

.page-about .tl-body p {
  margin: 0;
  font-size: 0.9375rem;
  line-height: 1.8;
  color: rgba(251, 248, 242, 0.78);
}

/* ---------- 团队 ---------- */

.page-about .team-bar {
  display: flex;
  height: 3.25rem;
  margin-top: clamp(1.5rem, 4vw, 2.25rem);
  border: 1px solid var(--about-line);
  border-radius: var(--radius-sm);
  overflow: hidden;
  box-shadow: var(--shadow-1);
}

.page-about .team-seg {
  display: block;
  transition: flex-grow 220ms var(--ease);
}

.page-about .seg-edit {
  flex: 14 1 0;
  background: var(--jade-600);
}

.page-about .seg-product {
  flex: 19 1 0;
  background: var(--gold-500);
}

.page-about .seg-support {
  flex: 13 1 0;
  background: var(--slate-500);
}

.page-about .team-seg:hover {
  flex-grow: 22;
}

.page-about .team-legend {
  display: grid;
  gap: 1.5rem;
  margin: 1.75rem 0 0;
  padding: 0;
  list-style: none;
}

.page-about .team-item {
  padding-top: 0.9rem;
  border-top: 1px solid var(--about-line);
}

.page-about .team-swatch {
  display: block;
  width: 26px;
  height: 3px;
  margin-bottom: 0.75rem;
}

.page-about .sw-edit {
  background: var(--jade-600);
}

.page-about .sw-product {
  background: var(--gold-500);
}

.page-about .sw-support {
  background: var(--slate-500);
}

.page-about .team-item h3 {
  margin: 0 0 0.5rem;
  font-family: var(--font-sans);
  font-weight: 500;
  font-size: 1.0625rem;
  letter-spacing: -0.01em;
  color: var(--ink-900);
}

.page-about .team-item p {
  margin: 0;
  font-size: 0.9375rem;
  line-height: 1.8;
  color: var(--ink-900);
}

/* ---------- 栏目维护 ---------- */

.page-about .about-section--jade {
  background: var(--jade-100);
}

.page-about .structure-grid {
  display: grid;
  gap: var(--about-gap);
  align-items: start;
}

.page-about .structure-lead p {
  margin: 0 0 1.05rem;
  font-size: 1rem;
  line-height: 1.8;
  color: var(--ink-900);
}

.page-about .structure-list {
  margin: 0;
  padding: 0;
  list-style: none;
  counter-reset: none;
}

.page-about .structure-list li {
  padding: 1.15rem 0;
  border-top: 1px solid rgba(14, 31, 26, 0.16);
}

.page-about .structure-list li:last-child {
  border-bottom: 1px solid rgba(14, 31, 26, 0.16);
}

.page-about .mono-label {
  display: inline-block;
  margin-bottom: 0.4rem;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.08em;
  color: var(--jade-600);
}

.page-about .structure-list h3 {
  margin: 0 0 0.4rem;
  font-family: var(--font-sans);
  font-weight: 500;
  font-size: 1.0625rem;
  line-height: 1.55;
  color: var(--ink-900);
}

.page-about .structure-list p {
  margin: 0;
  font-size: 0.9375rem;
  line-height: 1.8;
  color: var(--ink-700);
}

/* ---------- 协作网络 ---------- */

.page-about .network-grid {
  display: grid;
  gap: var(--about-gap);
  align-items: start;
}

.page-about .network-text > p {
  margin: 0 0 1.1rem;
  font-size: 1rem;
  line-height: 1.8;
  color: var(--ink-900);
}

.page-about .network-points {
  margin: 0 0 1.75rem;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 0.75rem;
}

.page-about .network-points li {
  position: relative;
  padding-left: 1.35rem;
  font-size: 0.9375rem;
  line-height: 1.8;
  color: var(--ink-900);
}

.page-about .network-points li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.72rem;
  width: 7px;
  height: 7px;
  background: var(--gold-500);
}

.page-about .network-figure {
  margin: 0;
  border: 1px solid var(--about-line);
  box-shadow: var(--shadow-2);
}

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

/* ---------- 理念 ---------- */

.page-about .creed-list {
  display: grid;
  gap: 0;
  margin-top: clamp(1.5rem, 4vw, 2.25rem);
}

.page-about .creed {
  padding: 1.35rem 0;
  border-top: 1px solid var(--about-line);
}

.page-about .creed:last-child {
  border-bottom: 1px solid var(--about-line);
}

.page-about .creed-num {
  display: block;
  margin-bottom: 0.35rem;
  font-family: var(--font-display);
  font-size: 1.25rem;
  line-height: 1;
  color: var(--gold-500);
}

.page-about .creed h3 {
  margin: 0 0 0.5rem;
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 1.25rem;
  letter-spacing: -0.01em;
  color: var(--ink-900);
}

.page-about .creed p {
  margin: 0;
  font-size: 0.9375rem;
  line-height: 1.8;
  color: var(--ink-900);
}

/* ---------- 收束 ---------- */

.page-about .about-cta {
  background: var(--ink-700);
  color: var(--paper-050);
  padding: var(--about-pad) 0;
}

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

.page-about .about-cta h2 {
  margin: 0 0 0.75rem;
  font-family: var(--font-display);
  font-weight: 600;
  font-size: clamp(1.35rem, 3.4vw, 1.875rem);
  line-height: 1.35;
  letter-spacing: -0.02em;
  color: var(--paper-050);
}

.page-about .about-cta p {
  margin: 0;
  max-width: 40em;
  font-size: 0.9375rem;
  line-height: 1.8;
  color: rgba(251, 248, 242, 0.78);
}

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

/* ---------- 响应式 ---------- */

@media (min-width: 760px) {
  .page-about .team-legend {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: clamp(1.25rem, 3vw, 2rem);
  }

  .page-about .creed-list {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    column-gap: clamp(1.5rem, 4vw, 3rem);
  }

  .page-about .creed {
    border-bottom: 1px solid var(--about-line);
  }

  .page-about .tl-num {
    font-size: 3.5rem;
  }
}

@media (min-width: 900px) {
  .page-about .about-hero-grid {
    grid-template-columns: minmax(0, 1.5fr) minmax(0, 1fr);
    align-items: center;
  }

  .page-about .origin-grid {
    grid-template-columns: minmax(0, 1.6fr) minmax(0, 0.9fr);
  }

  .page-about .band-head {
    grid-template-columns: minmax(0, 1.1fr) minmax(0, 1fr);
  }

  .page-about .structure-grid {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1.15fr);
  }

  .page-about .network-grid {
    grid-template-columns: minmax(0, 1.5fr) minmax(0, 1fr);
  }

  .page-about .cta-grid {
    grid-template-columns: minmax(0, 1.4fr) auto;
    align-items: center;
  }

  .page-about .timeline {
    padding-left: 2.5rem;
  }

  .page-about .tl-item::before {
    left: -2.5rem;
  }

  .page-about .tl-item > summary {
    grid-template-columns: 5rem minmax(0, 1fr) 1.25rem;
    gap: 1.25rem;
    padding: 1.35rem 0;
  }
}

@media (max-width: 430px) {
  .page-about {
    --about-pad: 2.25rem;
    --about-gap: 1.25rem;
  }

  .page-about .about-hero {
    padding-top: 1rem;
  }

  .page-about .fact {
    padding: 0.7rem 0.85rem;
  }

  .page-about .fact dd {
    font-size: 0.875rem;
  }

  .page-about .tl-item > summary {
    grid-template-columns: 2.25rem minmax(0, 1fr) 0.85rem;
    gap: 0.6rem;
    padding: 1rem 0;
  }

  .page-about .tl-body p,
  .page-about .team-item p,
  .page-about .structure-list p,
  .page-about .network-points li,
  .page-about .creed p,
  .page-about .about-cta p {
    font-size: 0.9375rem;
  }

  .page-about .about-btn {
    width: 100%;
  }

  .page-about .cta-actions {
    width: 100%;
  }
}

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