.page-about {
  --about-muted: rgba(16, 24, 32, 0.66);
  --about-glow: rgba(39, 211, 224, 0.14);
  --about-warm-line: rgba(255, 106, 42, 0.08);
}

.page-about img {
  display: block;
  max-width: 100%;
  height: auto;
}

.page-about h2 {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(1.85rem, 4vw, 3rem);
  line-height: 1.04;
  letter-spacing: -0.01em;
  margin: 0.55rem 0 1rem;
}

.page-about .prose p {
  margin: 0 0 1rem;
  line-height: 1.8;
}

/* ---------- 首屏 ---------- */

.page-about .about-hero {
  position: relative;
  overflow: hidden;
  background: var(--ink);
  color: var(--paper);
  padding-block: 1.25rem clamp(2.5rem, 6vw, 4rem);
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  right: -14%;
  bottom: -22%;
  width: min(60vw, 640px);
  aspect-ratio: 1;
  background: radial-gradient(circle at 50% 50%, var(--about-glow), transparent 64%);
  pointer-events: none;
}

.page-about .about-hero .breadcrumb {
  color: var(--warm);
  position: relative;
  z-index: 1;
}

.page-about .about-hero .breadcrumb a {
  color: var(--mist);
}

.page-about .hero-body {
  position: relative;
  z-index: 1;
  max-width: 62rem;
  margin-top: clamp(1.75rem, 5vw, 3.5rem);
}

.page-about .hero-serif {
  font-family: var(--font-serif);
  font-size: clamp(0.95rem, 1.5vw, 1.2rem);
  letter-spacing: 0.04em;
  color: var(--mist);
  margin: 0;
  padding-left: 0.85rem;
  border-left: 2px solid var(--signal);
}

.page-about .about-hero h1 {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(2.3rem, 7.4vw, 6.4rem);
  line-height: 0.96;
  letter-spacing: -0.02em;
  color: var(--paper);
  margin: 0.4em 0 0;
  max-width: 17ch;
}

.page-about .hero-lede {
  max-width: 46ch;
  margin: clamp(1rem, 2.5vw, 1.6rem) 0 0;
  font-size: clamp(0.95rem, 1.3vw, 1.0625rem);
  line-height: 1.85;
  color: var(--mist);
}

.page-about .hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin-top: clamp(1.5rem, 3vw, 2rem);
}

.page-about .hero-stats {
  position: relative;
  z-index: 1;
  list-style: none;
  margin: clamp(2rem, 5vw, 3.25rem) 0 0;
  padding: 1.25rem 0 0;
  border-top: 1px solid var(--line-dark);
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1.1rem 1rem;
}

.page-about .hero-stats li {
  display: flex;
  flex-direction: column;
  gap: 0.3rem;
  min-width: 0;
}

.page-about .stat-num {
  font-family: var(--font-mono);
  font-weight: 500;
  font-size: clamp(1.5rem, 3vw, 2.3rem);
  line-height: 1;
  letter-spacing: 0.04em;
  color: var(--cyan);
}

.page-about .stat-label {
  font-size: 0.8125rem;
  letter-spacing: 0.06em;
  color: var(--warm);
}

.page-about .hero-scale {
  height: 12px;
  margin-top: clamp(1.75rem, 4vw, 2.75rem);
  border-bottom: 1px solid var(--line-dark);
  background-image: repeating-linear-gradient(
    to right,
    var(--line-dark) 0 1px,
    transparent 1px 16px
  );
}

@media (min-width: 720px) {
  .page-about .hero-stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

/* ---------- 呼号由来 ---------- */

.page-about .about-origin {
  background: var(--ink-2);
  color: var(--paper);
}

.page-about .origin-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(2rem, 5vw, 3.5rem);
}

.page-about .origin-copy {
  min-width: 0;
}

.page-about .about-origin .prose p {
  color: var(--mist);
  font-size: 1rem;
}

.page-about .origin-list {
  margin: 1.75rem 0 0;
  display: grid;
  gap: 0;
}

.page-about .origin-row {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 1rem;
  padding: 0.9rem 0;
  border-top: 1px solid var(--line-dark);
}

.page-about .origin-row:last-child {
  border-bottom: 1px solid var(--line-dark);
}

.page-about .origin-row dt {
  font-family: var(--font-mono);
  font-size: 0.9375rem;
  letter-spacing: 0.08em;
  color: var(--signal);
  white-space: nowrap;
  padding-top: 0.1rem;
}

.page-about .origin-row dd {
  margin: 0;
  font-size: 0.9375rem;
  line-height: 1.75;
  color: var(--mist);
}

.page-about .origin-figure {
  margin: 0;
  min-width: 0;
}

.page-about .origin-figure figcaption {
  margin-top: 0.65rem;
  font-size: 0.75rem;
  letter-spacing: 0.09em;
  color: var(--warm);
}

@media (min-width: 900px) {
  .page-about .origin-grid {
    grid-template-columns: minmax(0, 1.15fr) minmax(0, 0.85fr);
    align-items: start;
  }
}

/* ---------- 时间轴 ---------- */

.page-about .about-timeline {
  background: var(--paper);
  color: var(--text);
}

.page-about .tl-head {
  max-width: 46rem;
  margin-bottom: clamp(1.5rem, 4vw, 2.5rem);
}

.page-about .tl-lede {
  margin: 0;
  font-size: 0.9375rem;
  line-height: 1.85;
  color: var(--about-muted);
}

.page-about .tl-list {
  display: grid;
  gap: 0;
}

.page-about .tl-item {
  border-top: 1px solid var(--line-paper);
}

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

.page-about .tl-item summary {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr) auto auto;
  align-items: center;
  gap: 0.9rem;
  padding: 1rem 0.4rem;
  cursor: pointer;
  list-style: none;
  transition: background-color 120ms var(--ease);
}

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

.page-about .tl-item summary:hover {
  background: var(--about-warm-line);
}

.page-about .tl-item summary:focus-visible {
  outline: 2px solid var(--signal);
  outline-offset: 2px;
}

.page-about .tl-no {
  font-family: var(--font-mono);
  font-size: 1.15rem;
  letter-spacing: 0.06em;
  color: var(--signal-deep);
}

.page-about .tl-title {
  font-family: var(--font-display);
  font-weight: 600;
  font-size: clamp(1.02rem, 2vw, 1.35rem);
  letter-spacing: 0.01em;
  letter-spacing: normal;
}

.page-about .tl-item summary::after {
  content: "+";
  font-family: var(--font-mono);
  font-size: 1.05rem;
  line-height: 1;
  color: var(--warm);
}

.page-about .tl-item[open] summary::after {
  content: "−";
  color: var(--signal-deep);
}

.page-about .tl-body {
  max-width: 52rem;
  padding: 0 0 1.3rem;
}

.page-about .tl-body p {
  margin: 0;
  font-size: 0.9375rem;
  line-height: 1.85;
  color: var(--about-muted);
}

@media (min-width: 760px) {
  .page-about .tl-item summary {
    padding: 1.15rem 0.5rem;
    gap: 1.4rem;
  }
}

/* ---------- 数据旁注带 ---------- */

.page-about .about-notes {
  background: var(--ink);
  color: var(--paper);
  padding-block: clamp(2rem, 5vw, 3rem);
  border-top: 1px solid var(--line-dark);
  border-bottom: 1px solid var(--line-dark);
}

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

.page-about .note-item {
  position: relative;
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
  min-width: 0;
  padding: 1rem 0.85rem;
  background: var(--ink);
  transition: background-color 120ms var(--ease);
}

.page-about .note-item:hover,
.page-about .note-item:focus {
  background: var(--ink-2);
  outline: none;
}

.page-about .note-num {
  font-family: var(--font-mono);
  font-size: clamp(1.3rem, 2.4vw, 1.7rem);
  font-weight: 500;
  line-height: 1;
  letter-spacing: 0.04em;
  color: var(--cyan);
}

.page-about .note-label {
  font-size: 0.75rem;
  letter-spacing: 0.05em;
  color: var(--warm);
}

.page-about .note-pop {
  font-size: 0.75rem;
  line-height: 1.65;
  color: var(--mist);
  max-height: 0;
  overflow: hidden;
  opacity: 0;
  transition: max-height 240ms var(--ease), opacity 200ms var(--ease);
}

.page-about .note-item:hover .note-pop,
.page-about .note-item:focus .note-pop,
.page-about .note-item:focus-within .note-pop {
  max-height: 10rem;
  opacity: 1;
}

@media (max-width: 859px) {
  .page-about .note-pop {
    max-height: none;
    opacity: 1;
  }
}

@media (min-width: 860px) {
  .page-about .note-grid {
    grid-template-columns: repeat(6, minmax(0, 1fr));
  }

  .page-about .note-item {
    padding: 1.1rem 0.9rem;
  }
}

/* ---------- 团队 ---------- */

.page-about .about-team {
  background: var(--ink-2);
  color: var(--paper);
}

.page-about .team-figure {
  margin: 0 0 clamp(1.75rem, 4vw, 2.75rem);
}

.page-about .team-figure figcaption {
  margin-top: 0.65rem;
  font-size: 0.75rem;
  letter-spacing: 0.09em;
  color: var(--warm);
}

.page-about .team-head {
  max-width: 46rem;
  margin-bottom: clamp(1.5rem, 3.5vw, 2.25rem);
}

.page-about .team-lede {
  margin: 0;
  font-size: 0.9375rem;
  line-height: 1.85;
  color: var(--mist);
}

.page-about .team-grid {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1px;
  background: var(--line-dark);
  border-top: 1px solid var(--line-dark);
  border-bottom: 1px solid var(--line-dark);
}

.page-about .team-item {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 1rem;
  align-items: start;
  padding: 1.25rem 0.75rem;
  background: var(--ink-2);
}

.page-about .team-num {
  font-family: var(--font-mono);
  font-size: clamp(1.35rem, 2.4vw, 1.75rem);
  font-weight: 500;
  line-height: 1;
  letter-spacing: 0.04em;
  color: var(--signal);
  padding-top: 0.15rem;
}

.page-about .team-copy {
  min-width: 0;
}

.page-about .team-copy h3 {
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 1.1rem;
  letter-spacing: 0.02em;
  margin: 0 0 0.4rem;
  color: var(--paper);
}

.page-about .team-copy p {
  margin: 0;
  font-size: 0.9rem;
  line-height: 1.8;
  color: var(--mist);
}

@media (min-width: 720px) {
  .page-about .team-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .page-about .team-item {
    padding: 1.4rem 1.25rem;
  }
}

/* ---------- 资质与荣誉 ---------- */

.page-about .about-proof {
  background: var(--paper);
  color: var(--text);
}

.page-about .proof-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(2rem, 5vw, 3.25rem);
}

.page-about .proof-copy {
  min-width: 0;
}

.page-about .about-proof .prose p {
  color: var(--about-muted);
  font-size: 0.9375rem;
}

.page-about .badge-list {
  list-style: none;
  margin: clamp(1.25rem, 3vw, 1.75rem) 0 0;
  padding: 0;
  display: grid;
  gap: 0;
}

.page-about .badge-list li {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 0.85rem;
  padding: 1rem 0;
  border-top: 1px solid var(--line-paper);
}

.page-about .badge-list li:last-child {
  border-bottom: 1px solid var(--line-paper);
}

.page-about .badge-no {
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  letter-spacing: 0.1em;
  color: var(--signal-deep);
  padding-top: 0.25rem;
}

.page-about .badge-list h3 {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.05rem;
  letter-spacing: 0.01em;
  margin: 0 0 0.3rem;
}

.page-about .badge-list p {
  margin: 0;
  font-size: 0.875rem;
  line-height: 1.8;
  color: var(--about-muted);
}

.page-about .proof-figure {
  margin: 0;
  min-width: 0;
}

.page-about .proof-figure figcaption {
  margin-top: 0.65rem;
  font-size: 0.75rem;
  letter-spacing: 0.09em;
  color: var(--warm);
}

@media (min-width: 940px) {
  .page-about .proof-grid {
    grid-template-columns: minmax(0, 1fr) minmax(0, 0.78fr);
    align-items: start;
  }
}

/* ---------- 合作方式 ---------- */

.page-about .about-collab {
  background: var(--ink);
  color: var(--paper);
}

.page-about .collab-head {
  max-width: 46rem;
}

.page-about .collab-lede {
  margin: 0;
  font-size: 0.9375rem;
  line-height: 1.85;
  color: var(--mist);
}

.page-about .step-list {
  list-style: none;
  margin: clamp(1.75rem, 4vw, 2.5rem) 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1px;
  background: var(--line-dark);
}

.page-about .step-item {
  background: var(--ink);
  padding: 1.2rem 0.75rem 1.4rem;
}

.page-about .step-no {
  display: block;
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  letter-spacing: 0.12em;
  color: var(--signal);
  margin-bottom: 0.6rem;
}

.page-about .step-item h3 {
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 1.1rem;
  letter-spacing: 0.02em;
  margin: 0 0 0.45rem;
  color: var(--paper);
}

.page-about .step-item p {
  margin: 0;
  font-size: 0.875rem;
  line-height: 1.8;
  color: var(--mist);
}

@media (min-width: 880px) {
  .page-about .step-list {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .page-about .step-item {
    padding: 1.35rem 1.25rem 1.6rem;
  }
}

.page-about .collab-cta {
  margin-top: clamp(1.75rem, 4vw, 2.5rem);
  padding: clamp(1.15rem, 3vw, 1.85rem);
  border: 1px solid var(--line-dark);
  border-left: 3px solid var(--signal);
  background: rgba(255, 106, 42, 0.06);
  display: flex;
  flex-wrap: wrap;
  gap: 1rem 1.5rem;
  align-items: center;
  justify-content: space-between;
}

.page-about .collab-cta p {
  margin: 0;
  max-width: 42ch;
  font-size: 0.9375rem;
  line-height: 1.8;
  color: var(--paper);
}

.page-about .collab-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.65rem;
}

@media (prefers-reduced-motion: reduce) {
  .page-about .note-pop,
  .page-about .tl-item summary,
  .page-about .note-item {
    transition: none;
  }
}
<<<END>>>