.page-about {
  background: var(--cream);
  color: var(--brown);
}

.page-about .mono {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  background:
    radial-gradient(circle at 88% 8%, rgba(194, 74, 30, 0.12), transparent 55%),
    var(--cream);
  border-bottom: 3px solid var(--brown);
}

.page-about .about-hero-inner {
  display: grid;
  gap: 32px;
  padding-top: clamp(24px, 5vw, 40px);
  padding-bottom: clamp(32px, 6vw, 56px);
}

.page-about .breadcrumbs {
  display: flex;
  gap: 8px;
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--moss);
  margin-bottom: 20px;
}

.page-about .breadcrumbs a {
  color: var(--brown);
  text-decoration: none;
  border-bottom: 2px solid var(--rust);
}

.page-about .breadcrumbs a:hover,
.page-about .breadcrumbs a:focus-visible {
  color: var(--rust);
}

.page-about .kicker {
  display: inline-block;
  font-size: 12px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--rust);
  border: 2px solid var(--rust);
  padding: 4px 10px;
  margin: 0 0 18px;
  background: rgba(255, 255, 255, 0.35);
}

.page-about h1 {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(32px, 7vw, 62px);
  line-height: 1.06;
  letter-spacing: -0.01em;
  margin: 0 0 20px;
  color: var(--brown);
  max-width: 14em;
}

.page-about .about-lede {
  font-size: clamp(16px, 1.5vw, 18px);
  line-height: 1.8;
  max-width: 40em;
  margin: 0 0 28px;
  color: #3a2f27;
}

.page-about .about-hero-stats {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--brown);
  border: 2px solid var(--brown);
}

.page-about .about-hero-stats li {
  background: var(--cream);
  padding: 14px 14px 12px;
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.page-about .about-stat-num {
  font-family: var(--font-mono);
  font-size: clamp(22px, 3.4vw, 30px);
  font-weight: 700;
  line-height: 1;
  color: var(--brown);
}

.page-about .about-hero-stats li:nth-child(2) .about-stat-num {
  color: var(--rust);
}

.page-about .about-stat-label {
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--moss);
}

.page-about .about-hero-figure {
  margin: 0;
  border: 3px solid var(--brown);
  box-shadow: var(--shadow-cream);
  background: var(--ink);
  overflow: hidden;
}

.page-about .about-hero-figure img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 7 / 5;
  object-fit: cover;
}

.page-about .media-cap {
  display: block;
  background: var(--brown);
  color: var(--cream);
  font-size: 12px;
  line-height: 1.6;
  padding: 10px 14px;
}

/* ---------- 目录 + 章节骨架 ---------- */
.page-about .about-body {
  display: grid;
  gap: 32px;
  padding-top: clamp(32px, 6vw, 64px);
  padding-bottom: clamp(48px, 8vw, 96px);
}

.page-about .about-toc {
  border: 2px solid var(--brown);
  background: rgba(255, 255, 255, 0.4);
  padding: 18px 16px;
}

.page-about .about-toc-title {
  font-size: 11px;
  letter-spacing: 0.18em;
  color: var(--rust);
  margin: 0 0 12px;
}

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

.page-about .about-toc-list a {
  display: inline-flex;
  align-items: baseline;
  gap: 8px;
  padding: 7px 12px;
  font-size: 14px;
  color: var(--brown);
  text-decoration: none;
  border: 2px solid rgba(27, 20, 16, 0.22);
  transition: border-color 0.18s var(--ease), background-color 0.18s var(--ease);
}

.page-about .about-toc-list a span {
  font-size: 11px;
  color: var(--rust);
}

.page-about .about-toc-list a:hover,
.page-about .about-toc-list a:focus-visible {
  border-color: var(--brown);
  background: var(--mint);
}

.page-about .about-toc-note {
  display: none;
  margin: 16px 0 0;
  font-size: 13px;
  line-height: 1.7;
  color: var(--moss);
  border-top: 1px dashed var(--line-strong);
  padding-top: 12px;
}

.page-about .about-toc-note a {
  color: var(--rust);
  font-weight: 600;
}

.page-about .about-chapters {
  display: flex;
  flex-direction: column;
  gap: clamp(40px, 7vw, 72px);
  min-width: 0;
}

.page-about .about-chapter {
  scroll-margin-top: 110px;
  border-top: 3px solid var(--brown);
  padding-top: 22px;
}

.page-about .about-chapter-head {
  display: flex;
  align-items: flex-start;
  gap: 14px;
  margin-bottom: 16px;
}

.page-about .about-chapter-num {
  font-size: clamp(30px, 6vw, 46px);
  font-weight: 700;
  line-height: 0.9;
  color: var(--rust);
  flex: none;
}

.page-about .about-chapter h2 {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(22px, 3.4vw, 34px);
  line-height: 1.2;
  margin: 0;
  letter-spacing: -0.005em;
  color: var(--brown);
}

.page-about .about-text {
  font-size: 16px;
  line-height: 1.85;
  margin: 0 0 22px;
  color: #33291f;
  max-width: 44em;
}

.page-about .about-text a {
  color: var(--rust);
  font-weight: 600;
  text-decoration: underline;
  text-underline-offset: 3px;
}

/* ---------- 01 三件事 ---------- */
.page-about .about-duty-grid {
  display: grid;
  gap: 14px;
  margin-bottom: 8px;
}

.page-about .about-duty {
  border: 2px solid var(--brown);
  background: #fbf5ea;
  padding: 18px 16px 16px;
  box-shadow: 5px 5px 0 rgba(27, 20, 16, 0.14);
  border-top-width: 6px;
}

.page-about .about-duty--a { border-top-color: var(--mint); }
.page-about .about-duty--b { border-top-color: var(--orange); }
.page-about .about-duty--c { border-top-color: var(--moss); }

.page-about .about-duty h3 {
  font-family: var(--font-display);
  font-size: 22px;
  font-weight: 800;
  letter-spacing: 0.02em;
  margin: 0 0 10px;
  color: var(--brown);
}

.page-about .about-duty p {
  font-size: 15px;
  line-height: 1.78;
  margin: 0 0 12px;
  color: #3a2f27;
}

.page-about .about-duty-meta {
  display: inline-block;
  font-size: 11px;
  letter-spacing: 0.08em;
  padding: 4px 9px;
  border: 1px dashed var(--line-strong);
  color: var(--moss);
  margin: 0;
}

.page-about .about-duty-meta--alert {
  border: 1px solid var(--rust);
  color: var(--rust);
  background: rgba(194, 74, 30, 0.08);
}

/* ---------- 02 版本时间轴 ---------- */
.page-about .about-version-panel {
  background: var(--ink);
  border: 3px solid var(--brown);
  box-shadow: var(--shadow-hard);
  padding: 20px 16px 16px;
  color: var(--paper);
}

.page-about .about-version-head {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 8px 16px;
  margin-bottom: 16px;
  border-bottom: 1px solid var(--line-strong);
  padding-bottom: 12px;
}

.page-about .about-version-kicker {
  font-size: 13px;
  letter-spacing: 0.16em;
  color: var(--mint);
  margin: 0;
}

.page-about .about-version-hint {
  font-size: 12px;
  color: var(--moss);
  margin: 0;
}

.page-about .about-track {
  list-style: none;
  margin: 0;
  padding: 4px 2px 16px;
  display: flex;
  gap: 14px;
  overflow-x: auto;
  scroll-snap-type: x mandatory;
  scrollbar-color: var(--mint) transparent;
}

.page-about .about-track::-webkit-scrollbar {
  height: 6px;
}

.page-about .about-track::-webkit-scrollbar-thumb {
  background: var(--mint);
}

.page-about .about-ver {
  flex: 0 0 78%;
  min-width: 232px;
  max-width: 320px;
  scroll-snap-align: start;
  background: var(--panel);
  border: 2px solid var(--line-strong);
  border-left: 4px solid var(--mint);
  padding: 16px 16px 18px;
  color: var(--paper);
}

.page-about .about-ver-tag {
  display: inline-block;
  font-size: 11px;
  letter-spacing: 0.1em;
  color: var(--ink);
  background: var(--mint);
  padding: 2px 8px;
  margin-bottom: 10px;
}

.page-about .about-ver-name {
  font-size: clamp(26px, 5vw, 36px);
  font-weight: 700;
  line-height: 1;
  margin: 0 0 8px;
  color: var(--mint-soft);
}

.page-about .about-ver-title {
  font-size: 15px;
  font-weight: 700;
  margin: 0 0 10px;
  color: var(--paper);
}

.page-about .about-ver p:last-child {
  font-size: 14px;
  line-height: 1.75;
  margin: 0;
  color: #b9c8c0;
}

.page-about .about-version-figure {
  margin: 16px 0 0;
  border: 2px solid var(--line-strong);
  overflow: hidden;
}

.page-about .about-version-figure img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 8 / 3;
  object-fit: cover;
  opacity: 0.9;
}

/* ---------- 03 团队 ---------- */
.page-about .about-team-grid {
  display: grid;
  gap: 12px;
  margin-bottom: 22px;
}

.page-about .about-team {
  border: 2px solid var(--brown);
  background: #fbf5ea;
  padding: 16px;
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.page-about .about-team-num {
  font-family: var(--font-mono);
  font-size: 34px;
  font-weight: 700;
  line-height: 1;
  color: var(--brown);
}

.page-about .about-team--data { border-bottom: 6px solid var(--mint); }
.page-about .about-team--video { border-bottom: 6px solid var(--mint-soft); }
.page-about .about-team--tech { border-bottom: 6px solid var(--moss); }
.page-about .about-team--support { border-bottom: 6px solid var(--orange); }

.page-about .about-team h3 {
  font-family: var(--font-display);
  font-size: 20px;
  font-weight: 800;
  margin: 0;
  color: var(--brown);
}

.page-about .about-team-role {
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--rust);
  margin: 0;
}

.page-about .about-team p:last-child {
  font-size: 14px;
  line-height: 1.75;
  margin: 4px 0 0;
  color: #3a2f27;
}

.page-about .about-team-figure {
  margin: 0;
  border: 3px solid var(--brown);
  box-shadow: var(--shadow-cream);
  background: var(--ink);
  overflow: hidden;
}

.page-about .about-team-figure img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 14 / 9;
  object-fit: cover;
}

/* ---------- 04 流程 ---------- */
.page-about .about-flow {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 2px;
  background: var(--brown);
  border: 2px solid var(--brown);
}

.page-about .about-flow-step {
  background: #fbf5ea;
  display: grid;
  grid-template-columns: 42px 1fr;
  gap: 12px;
  padding: 16px 14px;
  align-items: start;
}

.page-about .about-flow-num {
  display: grid;
  place-items: center;
  width: 34px;
  height: 34px;
  font-size: 15px;
  font-weight: 700;
  color: var(--cream);
  background: var(--rust);
  border: 2px solid var(--brown);
}

.page-about .about-flow-step h3 {
  font-family: var(--font-display);
  font-size: 19px;
  font-weight: 800;
  margin: 4px 0 6px;
  color: var(--brown);
}

.page-about .about-flow-step p {
  font-size: 15px;
  line-height: 1.78;
  margin: 0;
  color: #3a2f27;
}

/* ---------- 05 认证 ---------- */
.page-about .about-cert-grid {
  display: grid;
  gap: 14px;
  margin-bottom: 18px;
}

.page-about .about-cert {
  border: 3px solid var(--brown);
  background: #fbf5ea;
  box-shadow: 6px 6px 0 rgba(27, 20, 16, 0.16);
}

.page-about .about-cert summary {
  list-style: none;
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 14px 14px;
}

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

.page-about .about-cert-key {
  font-size: 12px;
  letter-spacing: 0.12em;
  padding: 4px 8px;
  border: 2px solid var(--rust);
  color: var(--rust);
  flex: none;
}

.page-about .about-cert-name {
  font-family: var(--font-display);
  font-size: 19px;
  font-weight: 800;
  color: var(--brown);
  flex: 1;
}

.page-about .about-cert-toggle {
  font-family: var(--font-mono);
  font-size: 20px;
  line-height: 1;
  color: var(--rust);
  transition: transform 0.18s var(--ease);
}

.page-about .about-cert[open] .about-cert-toggle {
  transform: rotate(45deg);
}

.page-about .about-cert p {
  margin: 0;
  padding: 0 14px 16px;
  font-size: 14px;
  line-height: 1.78;
  color: #3a2f27;
  border-top: 1px dashed var(--line-strong);
  padding-top: 12px;
}

.page-about .about-cert-note {
  font-size: 14px;
  line-height: 1.8;
  margin: 0;
  padding: 14px 16px;
  background: var(--ink);
  color: var(--paper);
  border-left: 6px solid var(--mint);
}

.page-about .about-cert-note a {
  color: var(--mint);
  font-weight: 600;
}

/* ---------- 06 合作网络 ---------- */
.page-about .about-network-grid {
  display: grid;
  gap: 12px;
  margin-bottom: 22px;
}

.page-about .about-network-card {
  border: 2px solid var(--brown);
  background: #fbf5ea;
  padding: 16px;
}

.page-about .about-network-card:nth-child(2n) {
  background: #f3e7d3;
}

.page-about .about-network-num {
  display: block;
  font-family: var(--font-mono);
  font-size: 32px;
  font-weight: 700;
  line-height: 1;
  color: var(--rust);
  margin-bottom: 10px;
}

.page-about .about-network-unit {
  font-size: 15px;
  margin-left: 2px;
}

.page-about .about-network-card h3 {
  font-family: var(--font-display);
  font-size: 18px;
  font-weight: 800;
  margin: 0 0 8px;
  color: var(--brown);
}

.page-about .about-network-card p {
  font-size: 14px;
  line-height: 1.76;
  margin: 0;
  color: #3a2f27;
}

/* ---------- 延伸阅读 ---------- */
.page-about .about-next {
  border-top: 3px solid var(--brown);
  padding-top: 22px;
}

.page-about .about-next h2 {
  font-family: var(--font-display);
  font-size: clamp(22px, 3.4vw, 30px);
  font-weight: 800;
  margin: 0 0 18px;
  color: var(--brown);
}

.page-about .about-next-grid {
  display: grid;
  gap: 12px;
}

.page-about .about-next-card {
  display: block;
  text-decoration: none;
  border: 2px solid var(--brown);
  background: transparent;
  padding: 16px;
  color: var(--brown);
  transition: background-color 0.18s var(--ease), box-shadow 0.18s var(--ease), transform 0.18s var(--ease);
}

.page-about .about-next-card span {
  display: block;
  font-size: 11px;
  letter-spacing: 0.12em;
  color: var(--rust);
  margin-bottom: 8px;
}

.page-about .about-next-card strong {
  display: block;
  font-family: var(--font-display);
  font-size: 19px;
  font-weight: 800;
  margin-bottom: 6px;
}

.page-about .about-next-card p {
  font-size: 13px;
  line-height: 1.7;
  margin: 0;
  color: #3a2f27;
}

.page-about .about-next-card:hover,
.page-about .about-next-card:focus-visible {
  background: var(--mint);
  box-shadow: 5px 5px 0 rgba(27, 20, 16, 0.6);
  transform: translate(-2px, -2px);
}

/* ---------- 响应式 ---------- */
@media (min-width: 700px) {
  .page-about .about-hero-stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

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

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

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

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

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

  .page-about .about-ver {
    flex: 0 0 300px;
  }
}

@media (min-width: 1000px) {
  .page-about .about-hero-inner {
    grid-template-columns: 1.05fr 0.95fr;
    align-items: center;
    gap: 40px;
  }

  .page-about .about-body {
    grid-template-columns: 232px minmax(0, 1fr);
    gap: 44px;
    align-items: start;
  }

  .page-about .about-toc {
    position: sticky;
    top: 104px;
  }

  .page-about .about-toc-list {
    flex-direction: column;
    gap: 6px;
  }

  .page-about .about-toc-list a {
    width: 100%;
    box-sizing: border-box;
    border-color: transparent;
    border-left: 3px solid rgba(27, 20, 16, 0.18);
    padding: 8px 10px;
  }

  .page-about .about-toc-list a:hover,
  .page-about .about-toc-list a:focus-visible {
    border-color: var(--brown);
    background: var(--mint);
  }

  .page-about .about-toc-note {
    display: block;
  }

  .page-about .about-team-grid {
    grid-template-columns: 1.5fr 1fr 1.8fr 0.85fr;
  }

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

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

  .page-about .about-flow-step {
    grid-template-columns: 56px 1fr;
    gap: 18px;
    padding: 20px 20px;
  }

  .page-about .about-chapter-head {
    gap: 20px;
    margin-bottom: 20px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-next-card,
  .page-about .about-cert-toggle,
  .page-about .about-toc-list a {
    transition: none;
  }
}
<<<PAGE_CSS_END>>>
<<<END>>>