.page-about {
  --about-card: #FBF6EC;
  --about-line: rgba(20, 16, 12, 0.18);
  --about-gold-line: rgba(201, 162, 39, 0.42);
}

/* ---------- 首屏 ---------- */
.page-about .mission-hero {
  position: relative;
  overflow: hidden;
  background: var(--c-hawk);
  color: var(--c-paper);
  border-bottom: var(--line) solid var(--c-ink);
  padding-block: var(--sp-2) var(--sp-9);
}

.page-about .mission-hero::after {
  content: "";
  position: absolute;
  inset: 0;
  background: repeating-linear-gradient(115deg, rgba(201, 162, 39, 0.07) 0 2px, transparent 2px 26px);
  pointer-events: none;
}

.page-about .mission-hero > .container {
  position: relative;
  z-index: 1;
}

.page-about .mission-hero .breadcrumb-link {
  color: var(--c-gold-lite);
}

.page-about .mission-hero .breadcrumb-current {
  color: rgba(243, 235, 221, 0.72);
}

.page-about .hero-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: var(--sp-4);
  padding-top: var(--sp-4);
}

.page-about .hero-title {
  margin: var(--sp-2) 0 0;
  font-size: clamp(48px, 11vw, 120px);
  line-height: 1.02;
  letter-spacing: 0.04em;
  color: var(--c-paper);
}

.page-about .hero-lead {
  margin-top: var(--sp-4);
  max-width: 640px;
  font-size: var(--fs-16);
  line-height: 1.75;
  color: rgba(243, 235, 221, 0.86);
}

.page-about .hero-facts {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: var(--sp-3);
  margin-top: var(--sp-6);
  padding-top: var(--sp-3);
  border-top: 1px solid var(--about-gold-line);
}

.page-about .fact-item {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.page-about .fact-num {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: var(--fs-32);
  line-height: 1;
  letter-spacing: 0.02em;
  color: var(--c-gold-lite);
}

.page-about .fact-label {
  font-size: var(--fs-12);
  line-height: 1.6;
  color: rgba(243, 235, 221, 0.66);
}

.page-about .hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: var(--sp-2);
  margin-top: var(--sp-6);
}

.page-about .mission-hero .btn--ghost {
  color: var(--c-paper);
  border-color: var(--c-gold-lite);
}

.page-about .hero-aside {
  display: none;
}

.page-about .hero-aside-note {
  writing-mode: vertical-rl;
  font-size: var(--fs-12);
  letter-spacing: 0.28em;
  color: var(--c-gold);
  margin: 0 0 var(--sp-4);
}

/* ---------- 通用章节头 ---------- */
.page-about .chapter-head {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: var(--sp-2);
  margin-bottom: var(--sp-6);
}

.page-about .chapter-index {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: var(--fs-14);
  letter-spacing: 0.3em;
  color: var(--c-gold);
}

.page-about .chapter-title {
  margin: 0;
  font-size: clamp(32px, 7vw, 72px);
  line-height: 1.08;
  letter-spacing: 0.03em;
}

.page-about .chapter-lead {
  margin-top: var(--sp-2);
  max-width: 620px;
  font-size: var(--fs-16);
  line-height: 1.75;
}

/* ---------- 主张由来 ---------- */
.page-about .mission-why {
  background: var(--c-paper);
  color: var(--c-ink);
  border-bottom: var(--line) solid var(--c-ink);
}

.page-about .mission-why .chapter-lead {
  color: rgba(20, 16, 12, 0.66);
}

.page-about .why-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: var(--sp-6);
  align-items: start;
}

.page-about .why-copy p {
  margin: 0 0 var(--sp-3);
  max-width: 36em;
  line-height: 1.85;
}

.page-about .why-figure {
  margin: 0;
}

.page-about .why-figure .media-frame {
  border: var(--line) solid var(--c-ink);
  box-shadow: var(--shadow-hard);
  background: var(--c-feather);
}

.page-about .why-figure-cap {
  margin-top: var(--sp-2);
  font-size: var(--fs-12);
  line-height: 1.7;
  color: rgba(20, 16, 12, 0.6);
  max-width: 32em;
}

/* ---------- 时间轴 ---------- */
.page-about .mission-timeline {
  position: relative;
  overflow: hidden;
  background: var(--c-hawk);
  color: var(--c-paper);
  border-bottom: var(--line) solid var(--c-ink);
}

.page-about .timeline-backdrop {
  position: absolute;
  inset: 0;
  z-index: 0;
}

.page-about .timeline-backdrop img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: 0.28;
}

.page-about .timeline-backdrop::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, rgba(42, 29, 21, 0.82), rgba(42, 29, 21, 0.96));
}

.page-about .mission-timeline > .container {
  position: relative;
  z-index: 1;
}

.page-about .mission-timeline .chapter-lead {
  color: rgba(243, 235, 221, 0.7);
}

.page-about .timeline-scroll {
  position: relative;
  z-index: 1;
  overflow-x: auto;
  scroll-snap-type: x proximity;
  overscroll-behavior-x: contain;
  padding: var(--sp-3) var(--gutter) var(--sp-9);
  -webkit-overflow-scrolling: touch;
}

.page-about .timeline-scroll:focus-visible {
  outline: 3px solid var(--c-gold-lite);
  outline-offset: -3px;
}

.page-about .timeline-track {
  position: relative;
  display: grid;
  grid-auto-flow: column;
  grid-auto-columns: minmax(240px, 78vw);
  gap: var(--sp-3);
  width: max-content;
  padding-bottom: var(--sp-9);
}

.page-about .timeline-feather {
  position: absolute;
  left: 0;
  bottom: 0;
  width: 100%;
  height: 48px;
  pointer-events: none;
  opacity: 0.65;
}

.page-about .timeline-node {
  scroll-snap-align: start;
  position: relative;
  padding: var(--sp-3);
  background: rgba(62, 44, 31, 0.94);
  border: var(--line) solid var(--c-ink);
  box-shadow: var(--shadow-hard);
  transition: transform 160ms ease, box-shadow 160ms ease, border-color 160ms ease;
}

.page-about .timeline-node:hover,
.page-about .timeline-node:focus-within {
  transform: translateY(-2px);
  box-shadow: var(--shadow-hard-lg);
  border-color: var(--c-gold);
}

.page-about .node-year {
  display: flex;
  align-items: center;
  gap: var(--sp-1);
  margin: 0 0 var(--sp-2);
  font-family: var(--font-display);
  font-weight: 900;
  font-size: var(--fs-32);
  line-height: 1;
  letter-spacing: 0.04em;
  color: var(--c-gold-lite);
}

.page-about .node-year::before {
  content: "";
  flex: 0 0 auto;
  width: 12px;
  height: 12px;
  border: var(--line) solid var(--c-gold);
  border-radius: 50%;
}

.page-about .node-year-sub {
  font-size: var(--fs-14);
  letter-spacing: 0.12em;
  color: var(--c-gold);
}

.page-about .node-title {
  margin: 0 0 var(--sp-2);
  font-size: var(--fs-24);
  line-height: 1.3;
  letter-spacing: 0.02em;
  color: var(--c-paper);
}

.page-about .node-desc {
  margin: 0;
  font-size: var(--fs-14);
  line-height: 1.8;
  color: rgba(243, 235, 221, 0.74);
}

.page-about details > summary {
  cursor: pointer;
  list-style: none;
  display: flex;
  align-items: center;
  gap: var(--sp-1);
}

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

.page-about details > summary::before {
  content: "+";
  font-family: var(--font-display);
  font-weight: 900;
  color: var(--c-gold);
  line-height: 1;
}

.page-about details[open] > summary::before {
  content: "−";
}

.page-about details > summary:focus-visible {
  outline: 3px solid var(--c-gold-lite);
  outline-offset: 2px;
}

.page-about .node-more {
  margin-top: var(--sp-2);
  padding-top: var(--sp-2);
  border-top: 1px solid var(--about-gold-line);
}

.page-about .node-more > summary {
  font-size: var(--fs-12);
  letter-spacing: 0.08em;
  color: var(--c-gold-lite);
}

.page-about .node-more p {
  margin: var(--sp-2) 0 0;
  font-size: var(--fs-14);
  line-height: 1.8;
  color: rgba(243, 235, 221, 0.78);
}

/* ---------- 团队 ---------- */
.page-about .mission-team {
  background: var(--c-dusk);
  color: var(--c-paper);
  border-bottom: var(--line) solid var(--c-ink);
}

.page-about .mission-team .chapter-lead {
  color: rgba(243, 235, 221, 0.72);
}

.page-about .team-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: var(--sp-6);
  align-items: start;
}

.page-about .team-figure {
  margin: 0;
}

.page-about .team-figure .media-frame {
  border: var(--line) solid var(--c-ink);
  box-shadow: var(--shadow-hard);
  background: var(--c-feather);
}

.page-about .team-figure-cap {
  margin-top: var(--sp-2);
  font-size: var(--fs-12);
  line-height: 1.7;
  color: rgba(243, 235, 221, 0.62);
  max-width: 32em;
}

.page-about .team-list {
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .team-item {
  padding-block: var(--sp-3);
  border-top: 1px solid var(--about-gold-line);
}

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

.page-about .team-role {
  margin: 0 0 var(--sp-1);
  font-size: var(--fs-18);
  letter-spacing: 0.08em;
  color: var(--c-gold-lite);
}

.page-about .team-desc {
  margin: 0;
  font-size: var(--fs-14);
  line-height: 1.85;
  color: rgba(243, 235, 221, 0.78);
  max-width: 40em;
}

.page-about .team-tail {
  margin: var(--sp-3) 0 0;
  font-size: var(--fs-14);
  line-height: 1.8;
  color: rgba(243, 235, 221, 0.66);
  max-width: 40em;
}

/* ---------- 价值准则 ---------- */
.page-about .mission-creed {
  background: var(--c-paper);
  color: var(--c-ink);
  border-bottom: var(--line) solid var(--c-ink);
}

.page-about .mission-creed .chapter-lead {
  color: rgba(20, 16, 12, 0.66);
}

.page-about .creed-quote {
  margin: 0 0 var(--sp-6);
  padding: var(--sp-4);
  background: var(--c-hawk);
  color: var(--c-paper);
  border-left: 8px solid var(--c-gold);
  box-shadow: var(--shadow-hard);
}

.page-about .creed-quote p {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: var(--fs-24);
  line-height: 1.5;
  letter-spacing: 0.04em;
}

.page-about .creed-cite {
  display: block;
  margin-top: var(--sp-3);
  font-size: var(--fs-12);
  letter-spacing: 0.24em;
  color: var(--c-gold-lite);
  font-style: normal;
}

.page-about .creed-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: var(--sp-2);
}

.page-about .creed-item {
  padding: var(--sp-3);
  background: var(--about-card);
  border: var(--line) solid var(--c-ink);
  box-shadow: var(--shadow-soft);
  transition: transform 160ms ease, box-shadow 160ms ease, border-color 160ms ease;
}

.page-about .creed-item:hover,
.page-about .creed-item:focus-within {
  transform: translateY(-2px);
  box-shadow: var(--shadow-hard);
  border-color: var(--c-gold);
}

.page-about .creed-item > summary {
  gap: var(--sp-2);
}

.page-about .creed-title {
  margin: 0;
  font-size: var(--fs-18);
  line-height: 1.4;
  letter-spacing: 0.06em;
  color: var(--c-ink);
}

.page-about .creed-body {
  margin-top: var(--sp-2);
  padding-top: var(--sp-2);
  border-top: 1px solid var(--about-line);
}

.page-about .creed-body p {
  margin: 0;
  font-size: var(--fs-14);
  line-height: 1.85;
  color: rgba(20, 16, 12, 0.76);
}

/* ---------- 结尾 ---------- */
.page-about .mission-cta {
  background: var(--c-hawk);
  color: var(--c-paper);
  border-top: var(--line) solid var(--c-ink);
}

.page-about .cta-inner {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: var(--sp-4);
  align-items: end;
}

.page-about .cta-title {
  margin: 0;
  font-size: clamp(32px, 7vw, 72px);
  line-height: 1.08;
  letter-spacing: 0.03em;
  color: var(--c-paper);
}

.page-about .cta-note {
  margin-top: var(--sp-2);
  max-width: 620px;
  font-size: var(--fs-16);
  line-height: 1.75;
  color: rgba(243, 235, 221, 0.76);
}

.page-about .cta-actions {
  display: flex;
  flex-wrap: wrap;
  gap: var(--sp-2);
}

.page-about .mission-cta .btn--ghost {
  color: var(--c-paper);
  border-color: var(--c-gold-lite);
}

/* ---------- 断点 ---------- */
@media (min-width: 640px) {
  .page-about .hero-facts {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

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

@media (min-width: 768px) {
  .page-about .chapter-head {
    grid-template-columns: 64px minmax(0, 1fr);
    gap: var(--sp-3);
  }

  .page-about .chapter-index {
    writing-mode: vertical-rl;
    transform: rotate(180deg);
    letter-spacing: 0.4em;
    padding-top: 4px;
  }

  .page-about .timeline-track {
    grid-auto-columns: 320px;
  }
}

@media (min-width: 900px) {
  .page-about .mission-hero {
    padding-block: var(--sp-3) var(--sp-15);
  }

  .page-about .hero-grid {
    grid-template-columns: minmax(0, 1fr) 140px;
    gap: var(--sp-9);
    padding-top: var(--sp-9);
    align-items: start;
  }

  .page-about .hero-aside {
    display: block;
    padding-top: var(--sp-9);
    border-left: 1px solid var(--about-gold-line);
    padding-left: var(--sp-3);
  }

  .page-about .why-grid {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, 0.95fr);
    gap: var(--sp-9);
    align-items: center;
  }

  .page-about .team-grid {
    grid-template-columns: minmax(0, 0.9fr) minmax(0, 1.1fr);
    gap: var(--sp-9);
    align-items: start;
  }

  .page-about .creed-grid {
    gap: var(--sp-3);
  }

  .page-about .cta-inner {
    grid-template-columns: minmax(0, 1fr) auto;
    gap: var(--sp-6);
  }

  .page-about .creed-quote p {
    font-size: var(--fs-32);
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .timeline-node,
  .page-about .creed-item {
    transition: none;
  }

  .page-about .timeline-node:hover,
  .page-about .timeline-node:focus-within,
  .page-about .creed-item:hover,
  .page-about .creed-item:focus-within {
    transform: none;
  }
}