.page-about {
  --ab-panel: rgba(14, 23, 48, 0.66);
  --ab-hair: rgba(42, 58, 107, 0.85);
  --ab-ink-soft: #33405c;
  --ab-ink-faint: #6b7794;
  font-family: var(--font-body);
}

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

.page-about a:focus-visible,
.page-about summary:focus-visible {
  outline: 2px solid var(--highlight);
  outline-offset: 3px;
  border-radius: var(--radius-sm);
}

.page-about .breadcrumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  font-size: 12px;
  letter-spacing: 0.12em;
}

.page-about .breadcrumb__link {
  color: var(--highlight);
  text-decoration: none;
}

.page-about .breadcrumb__link:hover {
  color: var(--violet-soft);
}

.page-about .breadcrumb__sep {
  color: var(--line);
}

.page-about .breadcrumb__current {
  color: var(--silver);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  overflow: hidden;
  padding-block: clamp(84px, 10vw, 130px) clamp(48px, 6vw, 84px);
  background:
    radial-gradient(120% 100% at 84% 0%, rgba(123, 92, 214, 0.22), transparent 58%),
    radial-gradient(70% 80% at 0% 100%, rgba(42, 58, 107, 0.6), transparent 64%),
    var(--deep);
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background-image:
    linear-gradient(to right, rgba(140, 155, 184, 0.1) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(140, 155, 184, 0.08) 1px, transparent 1px);
  background-size: 78px 78px;
  -webkit-mask-image: radial-gradient(72% 68% at 62% 18%, #000 0%, transparent 78%);
  mask-image: radial-gradient(72% 68% at 62% 18%, #000 0%, transparent 78%);
  opacity: 0.5;
}

.page-about .hero-grid {
  position: relative;
  z-index: 1;
  gap: clamp(24px, 3vw, 46px);
  align-items: end;
  margin-top: clamp(26px, 4vw, 44px);
}

.page-about .hero-copy .display {
  margin: 16px 0 20px;
  font-size: clamp(2rem, 5vw, 3.5rem);
  font-weight: 300;
  line-height: 1.14;
  letter-spacing: -0.02em;
  color: var(--moon);
}

.page-about .hero-copy .lede {
  max-width: 46ch;
  color: var(--moon);
  opacity: 0.84;
}

.page-about .hero-note {
  max-width: 52ch;
  margin-top: 18px;
  font-size: 0.9rem;
  line-height: 1.75;
  color: var(--silver);
}

.page-about .hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 26px;
}

.page-about .hero-facts {
  padding: 20px 22px;
  border: 1px solid var(--ab-hair);
  border-radius: var(--radius-lg);
  background: rgba(14, 23, 48, 0.72);
}

.page-about .hero-facts ul {
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .hero-facts li {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 14px;
  padding: 13px 0;
  border-bottom: 1px solid rgba(42, 58, 107, 0.7);
}

.page-about .hero-facts li:last-child {
  border-bottom: 0;
  padding-bottom: 0;
}

.page-about .fact-num {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: 1.35rem;
  line-height: 1;
  color: var(--moon);
}

.page-about .fact-label {
  font-size: 12px;
  letter-spacing: 0.1em;
  text-align: right;
  color: var(--silver);
}

/* ---------- 通用标题组 ---------- */
.page-about .section-head__title {
  margin: 12px 0 10px;
  font-size: clamp(1.65rem, 3.4vw, 2.5rem);
  font-weight: 300;
  line-height: 1.2;
  letter-spacing: -0.015em;
}

.page-about .section-head__note {
  max-width: 46ch;
  margin: 0;
  font-size: 0.95rem;
  line-height: 1.7;
}

/* ---------- 01 起点 ---------- */
.page-about .about-origin {
  background: var(--mist);
  color: var(--ink);
}

.page-about .about-origin .section-head__title {
  color: var(--ink);
}

.page-about .about-origin .section-head__note {
  color: var(--ab-ink-faint);
}

.page-about .about-origin .prose p {
  color: var(--ab-ink-soft);
  font-size: 1rem;
  line-height: 1.8;
}

.page-about .origin-list {
  display: grid;
  gap: 10px;
  margin: 26px 0 0;
  padding: 0;
  list-style: none;
}

.page-about .origin-list li {
  padding: 14px 16px 14px 20px;
  border-left: 2px solid rgba(123, 92, 214, 0.5);
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  background: #fff;
  font-size: 0.92rem;
  line-height: 1.7;
  color: var(--ab-ink-soft);
}

.page-about .origin-list strong {
  color: var(--ink);
  font-weight: 500;
}

.page-about .origin-note {
  margin-top: 28px;
  padding: 26px 24px;
  border: 1px solid rgba(123, 92, 214, 0.28);
  border-radius: var(--radius-lg);
  background: linear-gradient(160deg, rgba(123, 92, 214, 0.14), rgba(201, 214, 240, 0.28));
}

.page-about .origin-note p {
  margin: 0;
  font-size: 1.12rem;
  line-height: 1.7;
  color: var(--ink);
}

.page-about .origin-note__meta {
  display: block;
  margin-top: 16px;
  font-size: 12px;
  letter-spacing: 0.12em;
  color: #5b6884;
}

/* ---------- 02 时间线 ---------- */
.page-about .about-timeline {
  background: linear-gradient(180deg, var(--deep), var(--orbit) 55%, var(--deep));
  color: var(--moon);
}

.page-about .timeline-figure {
  margin: 0 0 clamp(30px, 4vw, 46px);
}

.page-about .figure img {
  width: 100%;
  border-radius: var(--radius-lg);
  border: 1px solid rgba(42, 58, 107, 0.7);
}

.page-about .figure__caption {
  margin-top: 12px;
  font-size: 12px;
  letter-spacing: 0.06em;
  line-height: 1.7;
  color: var(--silver);
}

.page-about .about-timeline .section-head__title {
  color: var(--moon);
}

.page-about .about-timeline .section-head__note {
  color: var(--silver);
}

.page-about .rail-wrap {
  position: relative;
  margin-top: 28px;
}

.page-about .rail__orbit {
  display: none;
}

.page-about .rail {
  display: grid;
  gap: 14px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .rail__item {
  position: relative;
  padding: 22px 20px 20px;
  border: 1px solid var(--ab-hair);
  border-radius: var(--radius-lg);
  background: var(--ab-panel);
}

.page-about .rail__head {
  display: flex;
  align-items: center;
  gap: 10px;
}

.page-about .rail__dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--violet);
  box-shadow: 0 0 0 4px rgba(123, 92, 214, 0.18);
}

.page-about .rail__year {
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.16em;
  color: var(--violet-soft);
}

.page-about .rail__title {
  margin: 12px 0 8px;
  font-size: 1.1rem;
  font-weight: 400;
  line-height: 1.4;
  color: var(--moon);
}

.page-about .rail__note {
  margin: 0;
  font-size: 0.92rem;
  line-height: 1.75;
  color: var(--silver);
}

.page-about .rail__more {
  margin-top: 14px;
  padding-top: 12px;
  border-top: 1px solid rgba(42, 58, 107, 0.72);
}

.page-about .rail__more summary {
  cursor: pointer;
  font-size: 13px;
  letter-spacing: 0.04em;
  color: var(--highlight);
  list-style: none;
}

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

.page-about .rail__more summary::after {
  content: " ＋";
  color: var(--violet-soft);
}

.page-about .rail__more[open] summary::after {
  content: " －";
}

.page-about .rail__more p {
  margin: 10px 0 0;
  font-size: 0.9rem;
  line-height: 1.75;
  color: var(--silver);
}

/* ---------- 03 团队 ---------- */
.page-about .about-team {
  background: var(--mist);
  color: var(--ink);
}

.page-about .about-team .section-head__title {
  color: var(--ink);
}

.page-about .about-team .section-head__note {
  color: var(--ab-ink-faint);
}

.page-about .about-team .prose p {
  color: var(--ab-ink-soft);
  font-size: 1rem;
  line-height: 1.8;
}

.page-about .editing-flow {
  margin: 30px 0 0;
  padding: 0;
  list-style: none;
}

.page-about .editing-flow li {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 14px;
  padding: 16px 0;
  border-top: 1px solid rgba(17, 26, 51, 0.12);
}

.page-about .step-no {
  padding-top: 3px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.12em;
  color: var(--violet);
}

.page-about .editing-flow h3 {
  margin: 0 0 5px;
  font-size: 1rem;
  font-weight: 500;
  color: var(--ink);
}

.page-about .editing-flow p {
  margin: 0;
  font-size: 0.92rem;
  line-height: 1.72;
  color: var(--ab-ink-soft);
}

.page-about .ring {
  position: relative;
  width: min(300px, 100%);
  aspect-ratio: 1 / 1;
  border-radius: 50%;
  display: grid;
  place-items: center;
  background: conic-gradient(
    from -90deg,
    var(--violet) 0 35.7%,
    var(--violet-soft) 35.7% 57.1%,
    var(--highlight) 57.1% 71.4%,
    rgba(42, 58, 107, 0.85) 71.4% 100%
  );
}

.page-about .ring::after {
  content: "";
  position: absolute;
  inset: 26px;
  border-radius: 50%;
  background: var(--mist);
}

.page-about .ring__center {
  position: relative;
  z-index: 1;
  text-align: center;
}

.page-about .ring__num {
  display: block;
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: 2.6rem;
  line-height: 1;
  color: var(--ink);
}

.page-about .ring__cap {
  display: block;
  margin-top: 6px;
  font-size: 12px;
  letter-spacing: 0.12em;
  color: #5b6884;
}

.page-about .ring-legend {
  display: grid;
  gap: 4px;
  margin: 18px 0 0;
  padding: 0;
  list-style: none;
}

.page-about .ring-legend li {
  display: grid;
  grid-template-columns: 12px 1fr auto;
  gap: 10px;
  align-items: center;
  padding: 8px 10px;
  border-radius: var(--radius-sm);
  font-size: 0.92rem;
  color: var(--ab-ink-soft);
  transition: background 0.2s ease;
}

.page-about .ring-legend li:hover {
  background: #fff;
}

.page-about .swatch {
  width: 12px;
  height: 12px;
  border-radius: 50%;
}

.page-about .swatch--a { background: var(--violet); }
.page-about .swatch--b { background: var(--violet-soft); }
.page-about .swatch--c { background: var(--highlight); }
.page-about .swatch--d { background: rgba(42, 58, 107, 0.85); }

.page-about .ring-legend .count {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  color: var(--ink);
}

.page-about .ring-legend .duty {
  grid-column: 1 / -1;
  font-size: 0.78rem;
  line-height: 1.6;
  color: var(--ab-ink-faint);
}

.page-about .team-media {
  margin: 26px 0 0;
}

/* ---------- 04 服务区域 ---------- */
.page-about .about-region {
  background:
    radial-gradient(90% 70% at 100% 0%, rgba(123, 92, 214, 0.16), transparent 62%),
    var(--void);
  color: var(--moon);
}

.page-about .about-region .section-head__title {
  color: var(--moon);
}

.page-about .about-region .section-head__note {
  color: var(--silver);
}

.page-about .about-region .prose p {
  color: var(--silver);
  font-size: 1rem;
  line-height: 1.8;
}

.page-about .region-media {
  margin-bottom: 26px;
}

.page-about .region-grid {
  display: grid;
  gap: 14px;
  margin-top: 26px;
}

.page-about .region-card {
  padding: 20px;
  border: 1px solid var(--ab-hair);
  border-radius: var(--radius-md);
  background: var(--ab-panel);
  transition: border-color 0.22s ease, transform 0.22s ease;
}

.page-about .region-card:hover {
  border-color: var(--violet);
  transform: translateY(-3px);
}

.page-about .region-card h3 {
  margin: 8px 0 10px;
  font-size: 1rem;
  font-weight: 500;
  line-height: 1.4;
  color: var(--moon);
}

.page-about .region-card p {
  margin: 0 0 8px;
  font-size: 0.9rem;
  line-height: 1.72;
  color: var(--silver);
}

.page-about .region-card p:last-child {
  margin-bottom: 0;
}

/* ---------- 05 更新节奏 ---------- */
.page-about .about-cadence {
  background: var(--mist);
  color: var(--ink);
}

.page-about .about-cadence .section-head__title {
  color: var(--ink);
}

.page-about .about-cadence .section-head__note {
  color: var(--ab-ink-faint);
}

.page-about .about-cadence .prose p {
  color: var(--ab-ink-soft);
  font-size: 1rem;
  line-height: 1.8;
}

.page-about .table-wrap {
  margin-top: 28px;
  overflow-x: auto;
  border-radius: var(--radius-md);
  border: 1px solid rgba(17, 26, 51, 0.1);
  background: #fff;
}

.page-about .cadence-table {
  width: 100%;
  min-width: 560px;
  border-collapse: collapse;
  font-size: 0.9rem;
}

.page-about .cadence-table th,
.page-about .cadence-table td {
  padding: 14px 16px;
  text-align: left;
  vertical-align: top;
  border-bottom: 1px solid rgba(17, 26, 51, 0.08);
  line-height: 1.7;
  color: var(--ab-ink-soft);
}

.page-about .cadence-table thead th {
  font-size: 12px;
  letter-spacing: 0.12em;
  color: var(--ab-ink-faint);
  background: #eef2f9;
  border-bottom: 1px solid rgba(17, 26, 51, 0.12);
}

.page-about .cadence-table tbody th {
  width: 22%;
  font-weight: 500;
  color: var(--ink);
}

.page-about .cadence-table td.num {
  white-space: nowrap;
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  color: var(--violet);
}

.page-about .cadence-table tbody tr:hover {
  background: #f5f7fb;
}

.page-about .cadence-table tbody tr:last-child th,
.page-about .cadence-table tbody tr:last-child td {
  border-bottom: 0;
}

.page-about .cadence-link {
  margin-top: 18px;
  font-size: 0.92rem;
  color: var(--ab-ink-soft);
}

.page-about .cadence-link a,
.page-about .next-note a {
  color: var(--violet);
  text-decoration: underline;
  text-underline-offset: 3px;
}

.page-about .cadence-link a:hover,
.page-about .next-note a:hover {
  color: var(--violet-soft);
}

/* ---------- 06 收束与下一步 ---------- */
.page-about .about-next {
  background:
    radial-gradient(80% 80% at 18% 0%, rgba(123, 92, 214, 0.2), transparent 62%),
    var(--void);
  color: var(--moon);
}

.page-about .about-next .section-head__title {
  color: var(--moon);
}

.page-about .about-next .section-head__note {
  color: var(--silver);
}

.page-about .next-stats {
  display: grid;
  gap: 12px;
  margin: 28px 0 26px;
}

.page-about .next-stats > div {
  padding: 20px;
  border: 1px solid var(--ab-hair);
  border-radius: var(--radius-md);
  background: var(--ab-panel);
}

.page-about .stat-num {
  display: block;
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: clamp(1.7rem, 4vw, 2.2rem);
  line-height: 1.1;
  color: var(--moon);
}

.page-about .stat-label {
  display: block;
  margin-top: 8px;
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--silver);
}

.page-about .next-lede {
  max-width: 56ch;
  font-size: 1rem;
  line-height: 1.8;
  color: var(--silver);
}

.page-about .next-paths {
  display: grid;
  gap: 14px;
  margin-top: 26px;
}

.page-about .path-card {
  display: flex;
  flex-direction: column;
  gap: 8px;
  padding: 22px;
  border: 1px solid var(--ab-hair);
  border-radius: var(--radius-lg);
  background: var(--ab-panel);
  color: var(--moon);
  text-decoration: none;
  transition: transform 0.22s ease, border-color 0.22s ease, background 0.22s ease;
}

.page-about .path-card:hover,
.page-about .path-card:focus-visible {
  transform: translateY(-4px);
  border-color: var(--violet);
  background: rgba(22, 34, 74, 0.92);
}

.page-about .path-card__no {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--violet-soft);
}

.page-about .path-card__title {
  font-size: 1.02rem;
  line-height: 1.45;
}

.page-about .path-card__note {
  font-size: 0.88rem;
  line-height: 1.7;
  color: var(--silver);
}

.page-about .next-note {
  margin-top: 26px;
  font-size: 0.86rem;
  line-height: 1.7;
  color: var(--silver);
}

/* ---------- 断点 ---------- */
@media (min-width: 760px) {
  .page-about .next-stats {
    grid-template-columns: repeat(3, 1fr);
  }

  .page-about .next-paths {
    grid-template-columns: repeat(3, 1fr);
  }

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

@media (min-width: 880px) {
  .page-about .rail-wrap {
    padding-top: 52px;
  }

  .page-about .rail__orbit {
    display: block;
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 46px;
    color: var(--violet-soft);
    opacity: 0.55;
    pointer-events: none;
  }

  .page-about .rail {
    grid-template-columns: repeat(3, 1fr);
    gap: 20px;
    align-items: start;
  }

  .page-about .rail__item {
    min-height: 100%;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .path-card,
  .page-about .region-card,
  .page-about .ring-legend li {
    transition: none;
  }

  .page-about .path-card:hover,
  .page-about .region-card:hover {
    transform: none;
  }
}
<<<END>>>