.page-about {
  --about-toc-w: 190px;
  --about-rail-w: 300px;
  --about-rule: rgba(200, 150, 62, 0.35);
  --about-tint: rgba(200, 150, 62, 0.1);
  background: var(--paper);
  color: var(--ink);
  font-family: var(--sans);
}

/* ---------- 面包屑 ---------- */
.page-about .about-crumb {
  padding-top: clamp(14px, 2.4vw, 24px);
}
.page-about .about-crumb .breadcrumb ol {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 6px;
  margin: 0;
  padding: 0;
  list-style: none;
  font-size: 13px;
  line-height: 1.6;
  color: var(--muted);
}
.page-about .about-crumb .breadcrumb li {
  display: inline-flex;
  align-items: center;
  gap: 6px;
}
.page-about .about-crumb .breadcrumb li + li::before {
  content: "/";
  color: var(--gold);
  opacity: 0.7;
}
.page-about .about-crumb .breadcrumb a {
  color: var(--muted);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color var(--ease), border-color var(--ease);
}
.page-about .about-crumb .breadcrumb a:hover {
  color: var(--cinnabar);
  border-bottom-color: rgba(179, 53, 44, 0.4);
}
.page-about .about-crumb .breadcrumb [aria-current="page"] {
  color: var(--ink);
  font-weight: 700;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  margin-top: clamp(16px, 2.4vw, 26px);
  padding: clamp(26px, 4.4vw, 52px) 0 clamp(24px, 3.6vw, 40px);
  border-top: 1px solid var(--line-gold);
  border-bottom: 1px solid var(--line-soft);
  background:
    radial-gradient(120% 92% at 4% -10%, rgba(200, 150, 62, 0.18), transparent 62%),
    radial-gradient(90% 80% at 96% 10%, rgba(79, 124, 107, 0.12), transparent 60%),
    linear-gradient(180deg, var(--sand) 0%, var(--paper) 84%);
}
.page-about h1 {
  margin: 12px 0 0;
  font-family: var(--serif);
  font-weight: 700;
  font-size: clamp(28px, 5.2vw, 58px);
  line-height: 1.18;
  letter-spacing: -0.015em;
  max-width: 16em;
  color: var(--ink);
}
.page-about .about-lede {
  margin: clamp(16px, 2.2vw, 24px) 0 0;
  font-size: clamp(15.5px, 1.3vw, 18px);
  line-height: 1.9;
  max-width: 34em;
  color: var(--ink);
}

.page-about .hero-facts {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 0;
  margin: clamp(24px, 3.6vw, 36px) 0 0;
  padding: 0;
  list-style: none;
  border-top: 1px solid var(--line-gold);
}
.page-about .hero-facts li {
  padding: 14px 0 14px 0;
  border-bottom: 1px solid var(--line-soft);
  min-width: 0;
}
.page-about .hero-facts li:nth-child(even) {
  padding-left: 16px;
  border-left: 1px solid var(--line-soft);
}
.page-about .fact-num {
  display: block;
  font-family: var(--mono);
  font-size: clamp(24px, 3.4vw, 34px);
  font-weight: 700;
  line-height: 1.1;
  color: var(--gold);
  letter-spacing: -0.02em;
}
.page-about .fact-label {
  display: block;
  margin-top: 5px;
  font-size: 12.5px;
  line-height: 1.55;
  color: var(--muted);
}

/* ---------- 通栏主图 ---------- */
.page-about .about-banner {
  margin: 0;
}
.page-about .about-banner img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 1400 / 600;
  object-fit: cover;
}

/* ---------- 三栏骨架 ---------- */
.page-about .about-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(26px, 4vw, 42px);
  padding-top: clamp(30px, 4.4vw, 54px);
  padding-bottom: clamp(44px, 6vw, 88px);
}
.page-about .about-toc,
.page-about .about-body,
.page-about .about-rail {
  min-width: 0;
}

/* ---------- 章节导航 ---------- */
.page-about .about-toc {
  border-top: 1px solid var(--line-gold);
  padding-top: 14px;
}
.page-about .toc-title {
  margin: 0 0 12px;
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.2em;
  color: var(--muted);
}
.page-about .toc-list {
  display: flex;
  gap: 8px;
  margin: 0;
  padding: 0 0 6px;
  list-style: none;
  overflow-x: auto;
  max-width: 100%;
  -webkit-overflow-scrolling: touch;
}
.page-about .toc-list li {
  flex: 0 0 auto;
}
.page-about .toc-list a {
  display: block;
  padding: 7px 12px;
  border: 1px solid var(--line);
  border-radius: 2px;
  font-size: 13px;
  line-height: 1.5;
  white-space: nowrap;
  color: var(--ink);
  text-decoration: none;
  transition: border-color var(--ease), background var(--ease), color var(--ease);
}
.page-about .toc-list a:hover,
.page-about .toc-list a:focus-visible {
  border-color: var(--gold);
  background: var(--about-tint);
  color: var(--gold);
}

/* ---------- 章节 ---------- */
.page-about .chapter {
  padding-bottom: clamp(26px, 3.6vw, 44px);
  margin-bottom: clamp(26px, 3.6vw, 44px);
  border-bottom: 1px solid var(--line-soft);
  scroll-margin-top: 28px;
}
.page-about .chapter:last-child {
  padding-bottom: 0;
  margin-bottom: 0;
  border-bottom: 0;
}
.page-about .chapter-head {
  display: flex;
  align-items: baseline;
  gap: clamp(10px, 1.6vw, 18px);
  margin: 0 0 clamp(14px, 2vw, 20px);
}
.page-about .chapter-num {
  flex: 0 0 auto;
  font-family: var(--mono);
  font-weight: 700;
  font-size: clamp(24px, 3.4vw, 38px);
  line-height: 1;
  letter-spacing: -0.03em;
  color: var(--gold);
}
.page-about .chapter h2 {
  margin: 0;
  font-family: var(--serif);
  font-weight: 700;
  font-size: clamp(20px, 2.5vw, 29px);
  line-height: 1.34;
  letter-spacing: -0.005em;
  color: var(--ink);
}
.page-about .chapter > p {
  margin: 0 0 15px;
  font-size: clamp(15px, 1.05vw, 16.5px);
  line-height: 1.92;
  max-width: 36em;
  color: var(--ink);
}
.page-about .chapter > h3 {
  margin: 24px 0 8px;
  font-family: var(--serif);
  font-weight: 700;
  font-size: clamp(16px, 1.5vw, 19px);
  line-height: 1.5;
  color: var(--navy);
}
.page-about .chapter > p:last-child {
  margin-bottom: 0;
}

/* ---------- 正文链接 ---------- */
.page-about .about-body a {
  color: var(--cinnabar);
  text-decoration: none;
  border-bottom: 1px solid rgba(179, 53, 44, 0.38);
  transition: border-color var(--ease), color var(--ease);
}
.page-about .about-body a:hover {
  border-bottom-color: var(--cinnabar);
}
.page-about .about-body a.btn {
  border-bottom: 0;
}
.page-about .about-body a.btn--primary {
  color: var(--paper);
}
.page-about .about-body a.btn--ghost {
  color: var(--ink);
}
.page-about .chapter > p a {
  font-weight: 700;
}

/* ---------- 引用句 ---------- */
.page-about .pull-quote {
  margin: clamp(20px, 3vw, 30px) 0;
  padding: 18px 20px 18px 22px;
  background: var(--sand);
  border-left: 3px solid var(--gold);
  font-family: var(--serif);
  font-size: clamp(16px, 1.75vw, 20px);
  line-height: 1.72;
  max-width: 32em;
  color: var(--ink);
}

/* ---------- 团队三色块 ---------- */
.page-about .team-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 12px;
  margin: clamp(20px, 2.8vw, 26px) 0 0;
}
.page-about .team-card {
  position: relative;
  padding: 20px 18px 18px;
  border-radius: 2px;
  overflow: hidden;
  color: var(--paper);
  transition: transform var(--ease), box-shadow var(--ease);
}
.page-about .team-card::after {
  content: "";
  position: absolute;
  right: -22px;
  bottom: -22px;
  width: 92px;
  height: 92px;
  border-radius: 50%;
  border: 1px solid rgba(246, 239, 226, 0.26);
  pointer-events: none;
}
.page-about .team-card:hover {
  transform: translateY(-2px);
  box-shadow: 0 12px 26px rgba(20, 16, 14, 0.18);
}
.page-about .team-card--edit {
  background: var(--celadon);
}
.page-about .team-card--tech {
  background: var(--navy);
}
.page-about .team-card--svc {
  background: var(--cinnabar);
}
.page-about .team-count {
  margin: 0 0 6px;
  font-family: var(--mono);
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.14em;
  color: rgba(246, 239, 226, 0.86);
}
.page-about .team-card h3 {
  margin: 0 0 10px;
  font-family: var(--serif);
  font-size: 20px;
  font-weight: 700;
  line-height: 1.4;
  color: var(--paper);
}
.page-about .team-card p {
  margin: 0 0 8px;
  font-size: 14.5px;
  line-height: 1.72;
  color: rgba(246, 239, 226, 0.95);
}
.page-about .team-card p.team-find {
  margin: 14px 0 0;
  padding-top: 10px;
  border-top: 1px solid rgba(246, 239, 226, 0.32);
  font-size: 13.5px;
  font-weight: 700;
  color: var(--paper);
}

/* ---------- 站内配图 ---------- */
.page-about .about-figure {
  margin: clamp(20px, 3vw, 28px) 0 0;
  padding: 6px;
  border: 1px solid var(--line-gold);
  background: var(--paper);
}
.page-about .about-figure img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
}
.page-about .about-figure figcaption {
  padding: 9px 4px 3px;
  font-size: 12.5px;
  line-height: 1.65;
  color: var(--muted);
}
.page-about .stages-figure {
  max-width: 380px;
}

/* ---------- 阶段清单 ---------- */
.page-about .stage-list {
  display: grid;
  gap: 14px;
  margin: clamp(20px, 2.8vw, 26px) 0 0;
  padding: 0;
  list-style: none;
}
.page-about .stage-item {
  position: relative;
  padding: 16px 22px 16px 20px;
  background: var(--sand);
  border-left: 3px solid var(--gold);
  overflow: hidden;
}
.page-about .stage-item::after {
  content: "";
  position: absolute;
  top: 0;
  right: 0;
  width: 18px;
  height: 18px;
  background: var(--paper);
  clip-path: polygon(100% 0, 0 0, 100% 100%);
  pointer-events: none;
}
.page-about .stage-item .stage-tag {
  margin: 0 0 7px;
  font-family: var(--mono);
  font-size: 11.5px;
  font-weight: 700;
  letter-spacing: 0.14em;
  color: var(--cinnabar);
}
.page-about .stage-item h3 {
  margin: 0 0 8px;
  font-family: var(--serif);
  font-size: clamp(16px, 1.5vw, 18px);
  font-weight: 700;
  line-height: 1.5;
  color: var(--navy);
}
.page-about .stage-item p {
  margin: 0 0 8px;
  font-size: 15px;
  line-height: 1.85;
  color: var(--ink);
}
.page-about .stage-item p:last-child {
  margin-bottom: 0;
}

/* ---------- 行动按钮 ---------- */
.page-about .cta-row {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: clamp(18px, 2.6vw, 24px);
}

/* ---------- 右侧栏 ---------- */
.page-about .about-rail {
  display: grid;
  gap: 16px;
  align-content: start;
}
.page-about .rail-panel {
  padding: 20px 18px;
  background: var(--sand);
  border-top: 3px solid var(--gold);
}
.page-about .rail-panel--night {
  background: var(--night);
  border-top-color: var(--gold-hi);
  color: var(--paper);
}
.page-about .rail-title {
  margin: 0 0 18px;
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.2em;
  color: var(--muted);
}
.page-about .rail-panel--night .rail-title {
  color: var(--on-dark);
}

.page-about .timeline {
  margin: 0;
  padding: 0;
  list-style: none;
}
.page-about .tl-node {
  position: relative;
  padding: 0 0 20px 24px;
  border-left: 1px solid var(--line-gold);
}
.page-about .tl-node:last-child {
  padding-bottom: 0;
  border-left-color: transparent;
}
.page-about .tl-dot {
  position: absolute;
  left: -7px;
  top: 3px;
  width: 13px;
  height: 13px;
  border-radius: 50%;
  border: 2px solid var(--gold);
  background: var(--sand);
  box-shadow: 0 0 0 3px rgba(200, 150, 62, 0.16);
}
.page-about .tl-node--now .tl-dot {
  background: var(--gold);
  box-shadow: 0 0 0 4px rgba(200, 150, 62, 0.26);
}
.page-about .tl-name {
  margin: 0 0 4px;
  font-family: var(--serif);
  font-size: 16px;
  font-weight: 700;
  line-height: 1.4;
  color: var(--ink);
}
.page-about .tl-desc {
  margin: 0;
  font-size: 13px;
  line-height: 1.65;
  color: var(--muted);
}

.page-about .rail-links {
  margin: 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 0;
}
.page-about .rail-links a {
  display: block;
  padding: 10px 0;
  border-bottom: 1px solid rgba(246, 239, 226, 0.16);
  font-size: 14px;
  line-height: 1.6;
  color: var(--paper);
  text-decoration: none;
  transition: color var(--ease), border-color var(--ease);
}
.page-about .rail-links li:last-child a {
  border-bottom: 0;
  padding-bottom: 0;
}
.page-about .rail-links a:hover,
.page-about .rail-links a:focus-visible {
  color: var(--gold-hi);
  border-bottom-color: var(--gold-hi);
}

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

@media (min-width: 720px) {
  .page-about .hero-facts {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
  .page-about .hero-facts li {
    padding: 4px 16px;
    border-bottom: 0;
    border-left: 1px solid var(--line-soft);
  }
  .page-about .hero-facts li:first-child {
    padding-left: 0;
    border-left: 0;
  }
}

@media (min-width: 980px) {
  .page-about .about-layout {
    grid-template-columns: var(--about-toc-w) minmax(0, 1fr) var(--about-rail-w);
    gap: clamp(24px, 3vw, 40px);
    align-items: start;
  }
  .page-about .about-toc,
  .page-about .about-rail {
    position: sticky;
    top: 24px;
  }
  .page-about .about-toc {
    padding-top: 16px;
  }
  .page-about .toc-list {
    flex-direction: column;
    gap: 0;
    overflow: visible;
    padding-bottom: 0;
  }
  .page-about .toc-list a {
    border: 0;
    border-left: 2px solid var(--line);
    border-radius: 0;
    padding: 9px 0 9px 12px;
    white-space: normal;
    font-size: 13.5px;
    background: none;
  }
  .page-about .toc-list a:hover,
  .page-about .toc-list a:focus-visible {
    border-left-color: var(--gold);
    background: none;
    color: var(--gold);
  }
  .page-about .chapter > p {
    max-width: 33em;
  }
}

@media (min-width: 1200px) {
  .page-about .chapter > p {
    font-size: 16.5px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .toc-list a,
  .page-about .team-card,
  .page-about .about-body a,
  .page-about .rail-links a,
  .page-about .about-crumb .breadcrumb a {
    transition-duration: 1ms;
  }
  .page-about .team-card:hover {
    transform: none;
  }
}