.page-about {
  background: var(--ink-900);
  color: var(--paper);
  padding-top: calc(var(--header-h) + 12px);
  padding-bottom: 0;
  overflow-x: hidden;
}

/* ==== 面包屑 ==== */
.page-about .breadcrumb {
  max-width: 1320px;
  margin: 0 auto;
  padding: 12px var(--gutter) 8px;
  display: flex;
  gap: 10px;
  font-size: var(--fs-12);
  letter-spacing: 0.1em;
  color: var(--muted);
  text-transform: uppercase;
}
.page-about .breadcrumb a {
  color: var(--muted);
  text-decoration: none;
  transition: color 200ms var(--ease);
}
.page-about .breadcrumb a:hover {
  color: var(--gold-300);
}
.page-about .breadcrumb [aria-current="page"] {
  color: var(--gold-500);
}

/* ==== 首屏 ==== */
.page-about .about-hero {
  max-width: 1320px;
  margin: 0 auto;
  padding: 56px var(--gutter) 80px;
  position: relative;
}
.page-about .about-hero::before {
  content: "";
  position: absolute;
  top: -80px;
  left: -8%;
  width: min(800px, 110%);
  height: 800px;
  background: radial-gradient(circle at 40% 40%, rgba(242, 160, 60, 0.16), transparent 62%);
  pointer-events: none;
  z-index: 0;
}
.page-about .about-hero > * {
  position: relative;
  z-index: 1;
}
.page-about .about-hero h1 {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(40px, 7vw, 72px);
  line-height: 1.06;
  letter-spacing: -0.02em;
  margin: 16px 0 28px;
  max-width: 880px;
  color: var(--paper);
}
.page-about .about-hero-lead {
  font-size: var(--fs-18);
  line-height: 1.75;
  color: var(--muted);
  max-width: 620px;
  margin: 0 0 18px;
}
.page-about .about-hero-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  list-style: none;
  padding: 0;
  margin: 32px 0 0;
}
.page-about .about-hero-meta .tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 8px 16px;
  border: 1px solid var(--line);
  color: var(--muted);
  background: var(--ink-800);
}
.page-about .about-hero-meta .tag--gold {
  border-color: var(--gold-700);
  color: var(--gold-300);
}

/* ==== 区块通用 ==== */
.page-about .about-section {
  padding: 72px 0;
  position: relative;
}
.page-about .about-section--team,
.page-about .about-section--questions {
  background: var(--ink-800);
}
.page-about .about-section--timeline {
  background: var(--ink-800);
  padding-bottom: 56px;
}
.page-about .about-section--collab {
  background: var(--ink-900);
  overflow: hidden;
}
.page-about .about-section--collab::before {
  content: "";
  position: absolute;
  top: 50%;
  right: -12%;
  width: 620px;
  height: 620px;
  background: radial-gradient(circle, rgba(242, 160, 60, 0.09), transparent 70%);
  transform: translateY(-50%);
  pointer-events: none;
}

.page-about .index-row {
  margin-bottom: 32px;
}

/* ==== 引用式章节标题 ==== */
.page-about .about-quote {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(22px, 2.6vw, 32px);
  line-height: 1.28;
  letter-spacing: -0.01em;
  color: var(--paper);
  border-left: 4px solid var(--gold-500);
  padding-left: 20px;
  margin: 0 0 28px;
  max-width: 620px;
}

/* ==== 正文段落 ==== */
.page-about .about-copy p {
  font-size: var(--fs-16);
  line-height: 1.85;
  color: var(--paper);
  max-width: 620px;
  margin: 0 0 1.4em;
}
.page-about .about-copy p:last-child {
  margin-bottom: 0;
}

/* ==== 起源 · 侧栏要点 ==== */
.page-about .about-note {
  background: var(--ink-800);
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  padding: 28px 24px;
  position: sticky;
  top: 96px;
}
.page-about .about-note-label {
  font-size: var(--fs-12);
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--gold-500);
  margin: 0 0 20px;
}
.page-about .about-note-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 20px;
}
.page-about .about-note-list li {
  display: flex;
  gap: 14px;
  align-items: flex-start;
  font-size: var(--fs-14);
  line-height: 1.7;
  color: var(--muted);
}
.page-about .about-note-num {
  font-size: var(--fs-24);
  color: var(--volt-400);
  font-weight: 700;
  line-height: 1;
  min-width: 56px;
  padding-top: 4px;
}

/* ==== 团队 · 通栏图 ==== */
.page-about .about-media-wide {
  margin: 0 0 40px;
  position: relative;
  border-radius: var(--radius-lg);
  overflow: hidden;
  border: 1px solid var(--line);
}
.page-about .about-media-wide img {
  display: block;
  width: 100%;
  height: auto;
  max-height: 380px;
  object-fit: cover;
  filter: saturate(0.85) brightness(0.92);
}
.page-about .about-media-wide figcaption {
  position: absolute;
  left: 24px;
  bottom: 16px;
  font-size: var(--fs-12);
  color: var(--paper);
  background: rgba(10, 12, 17, 0.72);
  padding: 6px 14px;
  border-radius: var(--radius-pill);
  letter-spacing: 0.02em;
}

/* ==== 团队 · 总人数与分栏 ==== */
.page-about .about-team-lead {
  display: flex;
  gap: 28px;
  align-items: flex-start;
  margin-bottom: 40px;
}
.page-about .about-team-total {
  font-size: clamp(72px, 9vw, 96px);
  line-height: 0.9;
  color: var(--gold-500);
  font-weight: 700;
  flex-shrink: 0;
}
.page-about .about-team-lead .about-quote {
  margin: 0;
  padding-left: 22px;
}

.page-about .about-team-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 24px;
}
.page-about .about-team-cell {
  padding: 28px 26px;
  border-radius: var(--radius-lg);
  border: 1px solid var(--line);
  background: var(--ink-900);
  transition: transform 260ms var(--ease), border-color 260ms var(--ease);
}
.page-about .about-team-cell:hover {
  transform: translateY(-2px);
  border-color: var(--gold-500);
}
.page-about .about-team-cell--primary {
  border-color: var(--gold-700);
}
.page-about .about-team-cell--accent {
  background: linear-gradient(160deg, rgba(79, 195, 247, 0.07), transparent 70%), var(--ink-900);
}
.page-about .about-team-cell--muted {
  background: var(--ink-800);
}
.page-about .about-team-kicker {
  font-size: var(--fs-12);
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--gold-500);
  margin: 0 0 12px;
}
.page-about .about-team-cell h3 {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: var(--fs-24);
  line-height: 1.2;
  margin: 0 0 12px;
  color: var(--paper);
}
.page-about .about-team-cell p {
  font-size: var(--fs-14);
  line-height: 1.75;
  color: var(--muted);
  margin: 0;
}

/* ==== 时间线 ==== */
.page-about .about-timeline-head {
  display: flex;
  flex-direction: column;
  gap: 24px;
  margin-bottom: 40px;
  align-items: flex-start;
}
.page-about .about-timeline-head .about-quote {
  margin: 0;
}
.page-about .about-timeline-wrap {
  position: relative;
  padding: 12px 0 0;
  isolation: isolate;
}
.page-about .about-timeline-bg {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: 0.35;
  z-index: 0;
  pointer-events: none;
}
.page-about .about-timeline-track {
  position: relative;
  z-index: 1;
  display: flex;
  gap: 20px;
  overflow-x: auto;
  scroll-snap-type: x mandatory;
  padding: 8px var(--gutter) 32px;
  scrollbar-width: thin;
  scrollbar-color: var(--gold-700) transparent;
}
.page-about .about-timeline-track:focus-visible {
  outline: 2px solid var(--gold-500);
  outline-offset: -4px;
}
.page-about .about-timeline-track::-webkit-scrollbar {
  height: 8px;
}
.page-about .about-timeline-track::-webkit-scrollbar-thumb {
  background: var(--gold-700);
  border-radius: var(--radius-pill);
}
.page-about .about-timeline-track::-webkit-scrollbar-track {
  background: transparent;
}
.page-about .about-tl-node {
  flex: 0 0 auto;
  width: min(340px, 82vw);
  padding: 24px 22px;
  background: var(--ink-900);
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
  scroll-snap-align: start;
  transition: transform 260ms var(--ease), border-color 260ms var(--ease), background 260ms var(--ease);
  position: relative;
}
.page-about .about-tl-node::before {
  content: "";
  position: absolute;
  left: 22px;
  top: 0;
  width: 32px;
  height: 3px;
  background: var(--gold-500);
  border-radius: 0 0 var(--radius-pill) var(--radius-pill);
}
.page-about .about-tl-node:hover,
.page-about .about-tl-node:focus-within {
  transform: translateY(-2px);
  border-color: var(--gold-500);
  background: var(--ink-700);
}
.page-about .about-tl-year {
  display: block;
  font-size: var(--fs-14);
  color: var(--volt-400);
  letter-spacing: 0.06em;
  margin-bottom: 14px;
}
.page-about .about-tl-node h3 {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: var(--fs-18);
  line-height: 1.3;
  margin: 0 0 10px;
  color: var(--paper);
}
.page-about .about-tl-node p {
  font-size: var(--fs-14);
  line-height: 1.75;
  color: var(--muted);
  margin: 0;
}

/* ==== 校对流程 ==== */
.page-about .about-steps {
  list-style: none;
  padding: 0;
  margin: 0;
}
.page-about .about-steps li {
  display: grid;
  grid-template-columns: 56px 1fr;
  gap: 16px;
  align-items: flex-start;
  padding: 22px 0;
  border-top: 1px solid var(--line);
}
.page-about .about-steps li:last-child {
  border-bottom: 1px solid var(--line);
}
.page-about .about-step-num {
  font-size: var(--fs-24);
  line-height: 1;
  color: var(--gold-500);
  font-weight: 700;
  margin-top: 4px;
}
.page-about .about-steps h3 {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: var(--fs-18);
  margin: 0 0 6px;
  color: var(--paper);
}
.page-about .about-steps p {
  font-size: var(--fs-14);
  line-height: 1.75;
  color: var(--muted);
  margin: 0;
}

/* ==== 问答 ==== */
.page-about .about-faq {
  margin-top: 8px;
}
.page-about .about-faq details {
  border-top: 1px solid var(--line);
  padding: 18px 0;
}
.page-about .about-faq details:last-child {
  border-bottom: 1px solid var(--line);
}
.page-about .about-faq summary {
  cursor: pointer;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: var(--fs-18);
  line-height: 1.4;
  color: var(--paper);
  list-style: none;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 16px;
  padding-right: 4px;
  transition: color 200ms var(--ease);
}
.page-about .about-faq summary::-webkit-details-marker {
  display: none;
}
.page-about .about-faq summary:hover {
  color: var(--gold-300);
}
.page-about .about-faq summary::after {
  content: "+";
  font-family: var(--font-mono);
  font-size: var(--fs-24);
  line-height: 1;
  color: var(--gold-500);
  flex-shrink: 0;
}
.page-about .about-faq details[open] summary::after {
  content: "−";
}
.page-about .about-faq details p {
  margin: 14px 0 0;
  font-size: var(--fs-14);
  line-height: 1.85;
  color: var(--muted);
  max-width: 620px;
}

/* ==== 档案概念图 ==== */
.page-about .about-archive-img {
  margin: 8px 0 0;
  border-radius: var(--radius-lg);
  overflow: hidden;
  border: 1px solid var(--line);
  background: var(--ink-900);
  position: relative;
}
.page-about .about-archive-img img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 1 / 1;
  object-fit: cover;
  filter: saturate(0.8) brightness(0.9);
}
.page-about .about-archive-img figcaption {
  position: absolute;
  left: 16px;
  right: 16px;
  bottom: 14px;
  font-size: var(--fs-12);
  color: var(--muted);
  background: rgba(10, 12, 17, 0.78);
  padding: 8px 12px;
  border-radius: var(--radius-sm);
  letter-spacing: 0.02em;
}

/* ==== 合作 CTA ==== */
.page-about .about-cta-box {
  background: var(--ink-800);
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  padding: 28px 24px;
  display: flex;
  flex-direction: column;
  gap: 12px;
}
.page-about .about-cta-title {
  font-size: var(--fs-12);
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--gold-500);
  margin: 0 0 8px;
}
.page-about .about-cta-box .btn {
  justify-content: center;
  width: 100%;
}

/* ==== Grid 辅助（仅当窄屏依赖全局 .col 时保护性设置） ==== */
.page-about .grid-12 > .col-5 .about-note {
  margin-top: 0;
}

/* ==== 桌面布局 ==== */
@media (min-width: 640px) {
  .page-about .about-section {
    padding: 96px 0;
  }
  .page-about .about-hero {
    padding: 72px var(--gutter) 104px;
  }
  .page-about .about-team-grid {
    grid-template-columns: 5fr 4fr 3fr;
    align-items: stretch;
  }
  .page-about .about-timeline-head {
    flex-direction: row;
    align-items: flex-end;
    justify-content: space-between;
    gap: 32px;
  }
  .page-about .about-tl-node {
    width: 360px;
  }
  .page-about .about-timeline-track {
    gap: 24px;
    padding-bottom: 40px;
  }
}

@media (min-width: 1024px) {
  .page-about .about-hero {
    padding: 96px var(--gutter) 128px;
  }
  .page-about .about-tl-node {
    width: 380px;
  }
  .page-about .about-media-wide img {
    max-height: 420px;
  }
}

/* ==== 窄屏重点保护 ==== */
@media (max-width: 639px) {
  .page-about .about-team-lead {
    flex-direction: column;
    gap: 16px;
  }
  .page-about .about-team-total {
    font-size: 72px;
  }
  .page-about .about-quote {
    padding-left: 16px;
    font-size: 22px;
  }
  .page-about .about-media-wide figcaption {
    position: static;
    background: var(--ink-700);
    border-radius: 0;
    display: block;
  }
}

/* ==== 动效减弱偏好 ==== */
@media (prefers-reduced-motion: reduce) {
  .page-about .about-team-cell,
  .page-about .about-tl-node,
  .page-about .about-faq summary,
  .page-about .breadcrumb a {
    transition: opacity 200ms linear;
  }
  .page-about .about-team-cell:hover,
  .page-about .about-tl-node:hover {
    transform: none;
  }
}

<<<END>>>