.page-about {
  background: var(--bg);
  color: var(--paper);
  font-family: var(--font-body);
  overflow-x: clip;
}

.page-about .about-crumbs {
  padding-top: clamp(1rem, 3vw, 1.75rem);
}

.page-about .breadcrumbs {
  font-size: 0.8rem;
  color: var(--muted);
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  align-items: center;
}

.page-about .breadcrumbs a {
  color: var(--muted);
  text-decoration: none;
  transition: color 0.18s ease;
}

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

.page-about .breadcrumbs a:focus-visible {
  outline: 2px solid var(--cyan);
  outline-offset: 4px;
  border-radius: var(--radius-sm);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  display: grid;
  gap: clamp(1.5rem, 4vw, 3rem);
  align-items: center;
  padding-block: clamp(1.5rem, 5vw, 3rem) clamp(2rem, 5vw, 3.5rem);
}

.page-about .eyebrow {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--cyan);
  margin: 0;
}

.page-about .about-hero h1 {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(2.1rem, 7.6vw, 4.2rem);
  line-height: 1.08;
  letter-spacing: -0.02em;
  margin: 0.6rem 0 1rem;
  color: var(--paper);
  text-wrap: balance;
}

.page-about .lede {
  color: var(--muted);
  line-height: 1.85;
  max-width: 46ch;
  margin: 0;
}

.page-about .hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin-top: 1.6rem;
}

.page-about .hero-figure {
  position: relative;
  margin: 0;
  aspect-ratio: 4 / 3;
  border-radius: var(--radius-lg);
  overflow: hidden;
  border: 1px solid var(--line-soft);
  box-shadow: var(--shadow-panel);
}

.page-about .hero-figure img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.page-about .hero-figure::after {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background: radial-gradient(65% 60% at 72% 18%, rgba(0, 229, 195, 0.2), transparent 68%);
}

/* ---------- 关键数字 ---------- */
.page-about .about-stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--line-soft);
  border: 1px solid var(--line-soft);
  border-radius: var(--radius-md);
  overflow: hidden;
}

.page-about .stat {
  background: var(--panel);
  padding: 1.05rem 1.15rem;
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
}

.page-about .stat-num {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: clamp(1.4rem, 3.6vw, 2.1rem);
  line-height: 1.1;
  color: var(--cyan);
  letter-spacing: -0.01em;
}

.page-about .stat-label {
  font-size: 0.8rem;
  color: var(--muted);
  line-height: 1.5;
}

/* ---------- 通用章节 ---------- */
.page-about .section {
  padding-block: clamp(2.5rem, 7vw, 5rem);
}

.page-about .chapter {
  display: grid;
  gap: clamp(1rem, 3vw, 2rem);
}

.page-about .index-label {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--cyan);
  margin: 0;
}

.page-about .section-title {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(1.6rem, 3.8vw, 2.6rem);
  line-height: 1.2;
  letter-spacing: -0.01em;
  margin: 0.5rem 0 1.1rem;
  color: var(--paper);
  text-wrap: balance;
}

.page-about .section-head {
  display: grid;
  gap: 0.5rem;
  max-width: 62ch;
}

.page-about .section-head .section-title {
  margin-bottom: 0.4rem;
}

.page-about .section-intro {
  color: var(--muted);
  line-height: 1.8;
  margin: 0;
}

.page-about .prose p {
  color: var(--muted);
  line-height: 1.85;
  margin: 0 0 1.1rem;
  max-width: 68ch;
}

.page-about .prose a {
  color: var(--cyan-soft);
  text-decoration: underline;
  text-underline-offset: 3px;
}

.page-about .prose a:hover {
  color: var(--cyan);
}

.page-about .pull-quote {
  margin: clamp(1.5rem, 4vw, 2.25rem) 0;
  padding: 0.15rem 0 0.15rem clamp(1rem, 2.5vw, 1.5rem);
  border-left: 3px solid var(--cyan);
  font-size: clamp(1.1rem, 2.5vw, 1.5rem);
  font-weight: 500;
  line-height: 1.65;
  color: var(--paper);
}

/* ---------- 时间轴 ---------- */
.page-about .timeline-section {
  border-block: 1px solid var(--line-soft);
  background:
    radial-gradient(110% 80% at 88% 0%, rgba(0, 229, 195, 0.1), transparent 62%),
    linear-gradient(180deg, rgba(15, 81, 60, 0.5), rgba(7, 17, 13, 0));
  padding-block: clamp(2.5rem, 7vw, 5rem);
}

.page-about .timeline-section .section {
  padding-block: 0;
}

.page-about .timeline-spark {
  display: block;
  width: 100%;
  max-width: 480px;
  height: auto;
  margin-top: 0.5rem;
  overflow: visible;
}

.page-about .spark-line {
  fill: none;
  stroke: var(--line);
  stroke-width: 2;
  stroke-linecap: round;
}

.page-about .spark-dot {
  fill: var(--panel-2);
  stroke: var(--cyan);
  stroke-width: 1.5;
}

.page-about .spark-dot--a,
.page-about .spark-dot--b {
  fill: var(--cyan);
}

.page-about .timeline-wrap {
  display: grid;
  gap: 1.5rem;
  margin-top: clamp(1.5rem, 4vw, 2.5rem);
}

.page-about .year-rail {
  display: flex;
  gap: 0.5rem;
  overflow-x: auto;
  padding-bottom: 0.35rem;
  scrollbar-width: thin;
}

.page-about .year-rail a {
  flex: 0 0 auto;
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: 0.78rem;
  letter-spacing: 0.1em;
  color: var(--muted);
  text-decoration: none;
  border: 1px solid var(--line-soft);
  border-radius: var(--radius-pill);
  padding: 0.35rem 0.75rem;
  transition: color 0.18s ease, border-color 0.18s ease, background 0.18s ease;
}

.page-about .year-rail a:hover,
.page-about .year-rail a:focus-visible {
  color: var(--cyan);
  border-color: var(--cyan);
  background: rgba(0, 229, 195, 0.08);
}

.page-about .year-rail a:focus-visible {
  outline: 2px solid var(--cyan);
  outline-offset: 3px;
}

.page-about .timeline {
  list-style: none;
  margin: 0;
  padding: 0;
  position: relative;
}

.page-about .timeline::before {
  content: "";
  position: absolute;
  left: 8px;
  top: 0.6rem;
  bottom: 0.6rem;
  width: 2px;
  background: linear-gradient(180deg, var(--cyan), var(--line) 55%, rgba(20, 107, 79, 0.15));
}

.page-about .timeline-item {
  position: relative;
  padding-left: clamp(2rem, 5vw, 2.75rem);
  padding-bottom: clamp(1.25rem, 3.5vw, 2rem);
}

.page-about .timeline-item:last-child {
  padding-bottom: 0;
}

.page-about .timeline-item::before {
  content: "";
  position: absolute;
  left: 8px;
  top: 1.15rem;
  width: var(--node, 12px);
  height: var(--node, 12px);
  border-radius: 50%;
  background: var(--bg);
  border: 2px solid var(--cyan);
  transform: translateX(-50%);
  box-shadow: 0 0 0 4px rgba(7, 17, 13, 0.9);
}

.page-about .stage {
  background: var(--panel);
  border: 1px solid var(--line-soft);
  border-radius: var(--radius-md);
  padding: clamp(1rem, 2.6vw, 1.45rem) clamp(1rem, 3vw, 1.6rem);
  transition: transform 0.18s ease, border-color 0.18s ease, background 0.18s ease;
}

.page-about .stage:hover,
.page-about .stage:focus-within {
  transform: translateY(-2px);
  border-color: var(--cyan);
  background: var(--panel-2);
}

.page-about .stage-year {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: 0.8rem;
  letter-spacing: 0.16em;
  color: var(--cyan);
  margin: 0;
}

.page-about .stage h3 {
  margin: 0.4rem 0 0.5rem;
  font-size: clamp(1.05rem, 2.3vw, 1.3rem);
  line-height: 1.4;
  color: var(--paper);
  font-weight: 700;
}

.page-about .stage p:last-child {
  margin: 0;
  color: var(--muted);
  font-size: 0.95rem;
  line-height: 1.8;
}

/* ---------- 数据日常 ---------- */
.page-about .ops {
  display: grid;
  gap: clamp(1.5rem, 4vw, 2.5rem);
}

.page-about .ops-text .section-title {
  margin-top: 0.5rem;
}

.page-about .ops-text > p {
  color: var(--muted);
  line-height: 1.85;
  margin: 0;
  max-width: 60ch;
}

.page-about .ops-list {
  list-style: none;
  margin: 1.6rem 0 0;
  padding: 0;
  display: grid;
  gap: 1rem;
}

.page-about .ops-item {
  display: grid;
  grid-template-columns: 3.6rem minmax(0, 1fr);
  gap: 0.85rem;
  padding-bottom: 1rem;
  border-bottom: 1px dashed var(--line-soft);
}

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

.page-about .ops-key {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.12em;
  color: var(--sand);
  padding-top: 0.25rem;
}

.page-about .ops-title-line {
  margin: 0 0 0.35rem;
  color: var(--paper);
  font-weight: 700;
  font-size: 1rem;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.page-about .ops-item p:last-child {
  margin: 0;
  color: var(--muted);
  font-size: 0.95rem;
  line-height: 1.8;
}

.page-about .ops-figure {
  margin: 0;
  border-radius: var(--radius-lg);
  overflow: hidden;
  border: 1px solid var(--line-soft);
}

.page-about .ops-figure img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
}

/* ---------- 团队 ---------- */
.page-about .role-list {
  display: grid;
  gap: 0.85rem;
  margin-top: 1.6rem;
}

.page-about .role {
  background: var(--panel-2);
  border: 1px solid var(--line-soft);
  border-radius: var(--radius-md);
  padding: 0.9rem clamp(1rem, 2.6vw, 1.35rem);
  transition: border-color 0.18s ease;
}

.page-about .role[open] {
  border-color: var(--line);
}

.page-about .role summary {
  cursor: pointer;
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 0.6rem 0.75rem;
}

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

.page-about .role summary::after {
  content: "展开";
  margin-left: auto;
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.12em;
  color: var(--muted);
}

.page-about .role[open] summary::after {
  content: "收起";
  color: var(--cyan);
}

.page-about .role summary:focus-visible {
  outline: 2px solid var(--cyan);
  outline-offset: 4px;
  border-radius: var(--radius-sm);
}

.page-about .role-tag {
  font-family: var(--font-mono);
  font-size: 0.74rem;
  letter-spacing: 0.12em;
  color: var(--cyan);
  border: 1px solid var(--line);
  border-radius: var(--radius-pill);
  padding: 0.2rem 0.65rem;
  white-space: nowrap;
}

.page-about .role-name {
  color: var(--paper);
  font-weight: 700;
  font-size: 0.98rem;
}

.page-about .role p {
  margin: 0.85rem 0 0;
  padding-left: 0.85rem;
  border-left: 2px solid var(--cyan);
  color: var(--muted);
  font-size: 0.95rem;
  line-height: 1.8;
}

/* ---------- 合作生态 ---------- */
.page-about .partner-grid {
  display: grid;
  gap: 1.25rem;
  margin-top: clamp(1.5rem, 4vw, 2.5rem);
}

.page-about .partner {
  background: var(--glass-strong);
  border: 1px solid rgba(214, 199, 161, 0.42);
  border-radius: var(--radius-md);
  padding: clamp(1.1rem, 3vw, 1.6rem);
  transition: transform 0.18s ease, border-color 0.18s ease, background 0.18s ease;
}

.page-about .partner:hover,
.page-about .partner:focus-within {
  transform: translateY(-2px);
  border-color: var(--cyan);
  background: var(--panel);
}

.page-about .partner-tag {
  font-family: var(--font-mono);
  font-size: 0.74rem;
  letter-spacing: 0.12em;
  color: var(--sand);
  margin: 0 0 0.6rem;
}

.page-about .partner h3 {
  margin: 0 0 0.55rem;
  font-size: clamp(1.05rem, 2.3vw, 1.25rem);
  line-height: 1.4;
  color: var(--paper);
  font-weight: 700;
}

.page-about .partner p:last-child {
  margin: 0;
  color: var(--muted);
  font-size: 0.95rem;
  line-height: 1.8;
}

.page-about .partner-figure {
  margin: clamp(1.75rem, 5vw, 3rem) 0 0;
  border-radius: var(--radius-md);
  overflow: hidden;
  border: 1px solid var(--line-soft);
}

.page-about .partner-figure img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
}

/* ---------- 收束 ---------- */
.page-about .closing-panel {
  margin-top: 1.25rem;
  display: grid;
  gap: 1.5rem;
  padding: clamp(1.4rem, 4.5vw, 2.75rem);
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  background: linear-gradient(150deg, var(--panel-2), var(--panel) 65%);
  box-shadow: var(--shadow-panel);
}

.page-about .closing-copy .section-title {
  margin-top: 0;
}

.page-about .closing-copy p {
  margin: 0;
  color: var(--muted);
  line-height: 1.85;
  max-width: 56ch;
}

.page-about .closing-links {
  display: grid;
  gap: 0.75rem;
  align-content: start;
}

.page-about .link-row {
  display: flex;
  flex-wrap: wrap;
  gap: 0.6rem;
}

.page-about .closing .btn {
  text-decoration: none;
}

/* ---------- 平板与桌面 ---------- */
@media (min-width: 760px) {
  .page-about .about-stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .page-about .stat {
    padding: 1.25rem 1.35rem;
  }
}

@media (min-width: 880px) {
  .page-about .about-hero {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
  }

  .page-about .hero-figure {
    aspect-ratio: 5 / 4;
  }

  .page-about .chapter {
    grid-template-columns: 172px minmax(0, 1fr);
    gap: clamp(1.75rem, 4vw, 3.25rem);
  }

  .page-about .chapter-rail {
    position: sticky;
    top: 96px;
    align-self: start;
  }

  .page-about .timeline-wrap {
    grid-template-columns: 150px minmax(0, 1fr);
    gap: clamp(1.5rem, 4vw, 3rem);
    align-items: start;
  }

  .page-about .year-rail {
    position: sticky;
    top: 96px;
    flex-direction: column;
    overflow: visible;
    padding-bottom: 0;
  }

  .page-about .year-rail a {
    text-align: center;
  }

  .page-about .ops {
    grid-template-columns: minmax(0, 6fr) minmax(0, 5fr);
    align-items: start;
  }

  .page-about .ops-figure {
    position: sticky;
    top: 96px;
  }

  .page-about .partner-grid {
    grid-template-columns: repeat(12, minmax(0, 1fr));
  }

  .page-about .partner--a {
    grid-column: 1 / span 5;
  }

  .page-about .partner--b {
    grid-column: 7 / span 5;
    margin-top: 3rem;
  }

  .page-about .partner--c {
    grid-column: 3 / span 7;
    margin-top: 1.5rem;
  }

  .page-about .partner-figure {
    margin-top: clamp(2rem, 5vw, 3.5rem);
  }

  .page-about .closing-panel {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    align-items: center;
  }

  .page-about .closing-links {
    justify-items: start;
  }
}

@media (min-width: 1100px) {
  .page-about .about-hero h1 {
    max-width: 14ch;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .stage,
  .page-about .partner,
  .page-about .year-rail a,
  .page-about .role {
    transition: none;
  }

  .page-about .stage:hover,
  .page-about .partner:hover {
    transform: none;
  }
}
<<<END>>>

.page-about {
  --node: 1rem;
}