.page-about {
  --about-line: rgba(36, 27, 23, 0.22);
  --about-line-soft: rgba(36, 27, 23, 0.1);
  --about-dark-line: rgba(31, 217, 208, 0.28);
  --about-paper: var(--cream);
  background: var(--cream);
  color: var(--ink);
  font-family: var(--font-body);
  line-height: 1.75;
  overflow-x: clip;
}

.page-about * {
  box-sizing: border-box;
}

.page-about .mono {
  font-family: var(--font-mono);
  letter-spacing: 0.08em;
}

/* ---------- 首屏 ---------- */

.page-about .about-masthead {
  position: relative;
  overflow: hidden;
  padding: clamp(26px, 4.6vw, 48px) 0 clamp(40px, 6.5vw, 76px);
  background:
    radial-gradient(circle at 84% 8%, rgba(31, 217, 208, 0.2), transparent 58%),
    linear-gradient(158deg, var(--deep) 0%, var(--midnight) 100%);
  color: var(--hilight);
  border-bottom: 1px solid rgba(31, 217, 208, 0.45);
}

.page-about .about-masthead::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(to right, rgba(31, 217, 208, 0.09) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(31, 217, 208, 0.09) 1px, transparent 1px);
  background-size: 62px 62px;
  -webkit-mask-image: linear-gradient(to bottom, #000 0%, transparent 88%);
  mask-image: linear-gradient(to bottom, #000 0%, transparent 88%);
  pointer-events: none;
}

.page-about .about-masthead .container {
  position: relative;
  z-index: 1;
}

.page-about .about-masthead .breadcrumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  margin: 0 0 clamp(18px, 3vw, 28px);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--mist);
}

.page-about .about-masthead .breadcrumb a {
  color: var(--neon);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: border-color var(--t-fast), color var(--t-fast);
}

.page-about .about-masthead .breadcrumb a:hover {
  border-bottom-color: var(--neon);
}

.page-about .about-masthead .breadcrumb span[aria-hidden="true"] {
  color: rgba(143, 166, 184, 0.65);
}

.page-about .about-masthead .eyebrow {
  margin: 0 0 12px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--neon);
}

.page-about .about-masthead h1 {
  margin: 0 0 clamp(16px, 2.6vw, 24px);
  max-width: 22ch;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(1.85rem, 5vw, 3.5rem);
  line-height: 1.16;
  letter-spacing: -0.02em;
  color: #ffffff;
}

.page-about .about-lede {
  margin: 0;
  max-width: 62ch;
  font-size: clamp(0.95rem, 1.6vw, 1.0625rem);
  color: rgba(184, 255, 249, 0.84);
}

.page-about .about-facts {
  list-style: none;
  margin: clamp(26px, 4vw, 38px) 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  border: 1px solid var(--about-dark-line);
  background: var(--about-dark-line);
}

.page-about .about-facts li {
  display: flex;
  flex-direction: column;
  gap: 4px;
  padding: 14px 16px;
  background: var(--midnight);
}

.page-about .fact-num {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(1.3rem, 2.6vw, 1.75rem);
  line-height: 1.1;
  letter-spacing: -0.02em;
  color: var(--hilight);
}

.page-about .fact-label {
  font-size: 0.8125rem;
  line-height: 1.5;
  color: var(--mist);
}

/* ---------- 主体骨架 ---------- */

.page-about .about-shell {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(22px, 3.5vw, 32px);
  padding-top: clamp(30px, 4.5vw, 52px);
  padding-bottom: clamp(52px, 7vw, 92px);
}

.page-about .about-body {
  display: grid;
  gap: clamp(38px, 6vw, 68px);
  min-width: 0;
}

.page-about .about-section,
.page-about .tl-node {
  scroll-margin-top: 96px;
}

/* ---------- 索引栏 ---------- */

.page-about .about-rail {
  display: flex;
  align-items: center;
  gap: 8px;
  overflow-x: auto;
  padding-bottom: 10px;
  border-bottom: 1px solid var(--about-line);
  scrollbar-width: thin;
}

.page-about .rail-title {
  flex: none;
  margin: 0 6px 0 0;
  font-size: 11px;
  color: var(--ember);
  white-space: nowrap;
}

.page-about .about-rail a {
  flex: none;
  padding: 5px 13px;
  border: 1px solid var(--about-line);
  border-radius: 999px;
  background: transparent;
  color: var(--ink);
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  letter-spacing: 0.04em;
  text-decoration: none;
  white-space: nowrap;
  transition: border-color var(--t-fast), color var(--t-fast), background var(--t-fast);
}

.page-about .about-rail a:hover,
.page-about .about-rail a:focus-visible {
  border-color: var(--ember);
  color: var(--ember);
  background: rgba(231, 90, 60, 0.07);
}

/* ---------- 通用章节件 ---------- */

.page-about .section-head {
  margin-bottom: clamp(16px, 2.4vw, 22px);
}

.page-about .section-head .eyebrow {
  margin: 0 0 8px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--ember);
}

.page-about .about-section h2 {
  margin: 0;
  max-width: 26ch;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(1.35rem, 3.2vw, 2rem);
  line-height: 1.26;
  letter-spacing: -0.015em;
  color: var(--ink);
}

.page-about .about-section h3 {
  margin: 0 0 8px;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(1.0625rem, 2vw, 1.25rem);
  line-height: 1.35;
  color: var(--ink);
}

.page-about .paper-card {
  position: relative;
  padding: clamp(18px, 3vw, 30px);
  background: var(--about-paper);
  border: 1px solid rgba(36, 27, 23, 0.5);
  border-radius: var(--radius-s);
  box-shadow: var(--shadow-paper);
}

.page-about .paper-card::after {
  content: "";
  position: absolute;
  inset: 0 0 auto;
  height: 4px;
  background: var(--paper-2);
  border-radius: var(--radius-s) var(--radius-s) 0 0;
}

.page-about .about-prose p {
  margin: 0 0 14px;
  max-width: 68ch;
  color: rgba(36, 27, 23, 0.9);
}

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

/* ---------- 起点 ---------- */

.page-about .origin-points {
  list-style: none;
  margin: 18px 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 10px;
}

.page-about .origin-points li {
  padding: 10px 0 10px 14px;
  border-left: 3px solid var(--ember);
  background: linear-gradient(90deg, rgba(231, 90, 60, 0.09), transparent 85%);
}

.page-about .origin-points strong {
  display: block;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 1.3rem;
  line-height: 1.3;
  letter-spacing: -0.01em;
  color: var(--ink);
}

.page-about .origin-points span {
  display: block;
  margin-top: 2px;
  font-size: 0.875rem;
  line-height: 1.6;
  color: rgba(36, 27, 23, 0.7);
}

/* ---------- 版本时间线 ---------- */

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

.page-about .about-timeline::before {
  content: "";
  position: absolute;
  left: 15px;
  top: 10px;
  bottom: 10px;
  width: 1px;
  background: linear-gradient(to bottom, rgba(231, 90, 60, 0.75), rgba(231, 90, 60, 0.12));
}

.page-about .tl-node {
  position: relative;
  padding-left: 46px;
  padding-bottom: 16px;
}

.page-about .tl-node::before {
  content: "";
  position: absolute;
  left: 9px;
  top: 24px;
  width: 13px;
  height: 13px;
  border-radius: 50%;
  background: var(--cream);
  border: 2px solid var(--ember);
  box-shadow: 0 0 0 4px var(--cream);
}

.page-about .tl-card {
  position: relative;
  overflow: hidden;
  padding: 16px 18px 18px;
  background: var(--about-paper);
  border: 1px solid rgba(36, 27, 23, 0.45);
  border-radius: var(--radius-s);
  box-shadow: var(--shadow-paper);
  transition: border-color var(--t-fast), transform var(--t-fast);
}

.page-about .tl-card:hover {
  border-color: var(--ember);
  transform: translateX(2px);
}

.page-about .tl-num {
  position: absolute;
  right: 8px;
  top: -18px;
  font-family: var(--font-display);
  font-weight: 200;
  font-size: clamp(3.4rem, 9vw, 5.2rem);
  line-height: 1;
  letter-spacing: -0.05em;
  color: rgba(36, 27, 23, 0.09);
  pointer-events: none;
}

.page-about .tl-meta {
  position: relative;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px;
  margin: 0 0 8px;
  font-size: 11px;
  color: rgba(36, 27, 23, 0.65);
}

.page-about .tl-tag {
  padding: 2px 8px;
  border-radius: 3px;
  background: var(--ink);
  color: var(--cream);
  font-size: 11px;
  letter-spacing: 0.12em;
}

.page-about .tl-card p {
  position: relative;
  margin: 0;
  max-width: 62ch;
  font-size: 0.9375rem;
  line-height: 1.72;
  color: rgba(36, 27, 23, 0.82);
}

.page-about .keep-old {
  margin-top: 20px;
  margin-left: 46px;
  border-left: 4px solid var(--ember);
}

.page-about .keep-old-title {
  margin: 0 0 8px;
  font-size: 12px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--ember);
}

.page-about .keep-old p {
  margin: 0;
  max-width: 64ch;
  font-size: 0.9375rem;
  color: rgba(36, 27, 23, 0.85);
}

/* ---------- 图 ---------- */

.page-about .about-figure {
  margin: clamp(20px, 3vw, 28px) 0 0;
}

.page-about .about-figure .fig-media img {
  display: block;
  width: 100%;
  height: auto;
  border-radius: var(--radius-s);
  border: 1px solid var(--about-line);
  object-fit: cover;
}

.page-about .about-figure .fig-cap {
  margin-top: 8px;
  font-family: var(--font-mono);
  font-size: 11px;
  line-height: 1.6;
  color: rgba(36, 27, 23, 0.6);
}

.page-about .about-figure--dark .fig-media img {
  border-color: var(--about-dark-line);
}

.page-about .about-figure--dark .fig-cap {
  color: var(--mist);
}

/* ---------- 团队 ---------- */

.page-about .section-team {
  padding: clamp(22px, 3.6vw, 40px);
  border-radius: var(--radius-m);
  border: 1px solid var(--about-dark-line);
  background:
    radial-gradient(circle at 92% 4%, rgba(31, 217, 208, 0.16), transparent 52%),
    linear-gradient(160deg, var(--deep) 0%, var(--midnight) 100%);
  color: var(--hilight);
}

.page-about .section-team .section-head .eyebrow {
  color: var(--amber);
}

.page-about .section-team h2 {
  color: #ffffff;
}

.page-about .team-lede {
  margin: 0 0 clamp(16px, 2.6vw, 24px);
  max-width: 64ch;
  font-size: 0.9375rem;
  color: rgba(184, 255, 249, 0.8);
}

.page-about .team-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 12px;
}

.page-about .team-card {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: 18px;
  border: 1px solid var(--about-dark-line);
  border-radius: var(--radius-s);
  background: rgba(184, 255, 249, 0.055);
  transition: border-color var(--t-fast), background var(--t-fast);
}

.page-about .team-card:hover {
  border-color: rgba(31, 217, 208, 0.65);
  background: rgba(184, 255, 249, 0.1);
}

.page-about .team-role {
  margin: 0;
  font-size: 11px;
  letter-spacing: 0.16em;
  color: var(--neon);
}

.page-about .team-count {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 300;
  font-size: clamp(2.1rem, 4.6vw, 3rem);
  line-height: 1;
  letter-spacing: -0.03em;
  color: var(--hilight);
}

.page-about .team-unit {
  margin-left: 4px;
  font-family: var(--font-body);
  font-size: 0.8125rem;
  font-weight: 400;
  letter-spacing: 0.04em;
  color: var(--mist);
}

.page-about .team-desc {
  margin: 0;
  font-size: 0.9375rem;
  line-height: 1.72;
  color: rgba(184, 255, 249, 0.82);
}

/* ---------- 兼容 ---------- */

.page-about .compat-intro {
  margin-bottom: clamp(16px, 2.4vw, 22px);
}

.page-about .compat-grid {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 10px;
}

.page-about .compat-cell {
  padding: 13px 16px;
  border: 1px solid var(--about-line);
  border-radius: var(--radius-s);
  background: var(--cream);
  cursor: default;
  transition: border-color var(--t-fast), box-shadow var(--t-fast);
}

.page-about .compat-cell:hover,
.page-about .compat-cell:focus,
.page-about .compat-cell:focus-within {
  border-color: var(--ember);
  box-shadow: 0 0 0 3px rgba(231, 90, 60, 0.14);
}

.page-about .compat-cell:focus-visible {
  outline: 2px solid var(--ember);
  outline-offset: 2px;
}

.page-about .compat-name {
  display: block;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 0.9375rem;
  line-height: 1.4;
  color: var(--ink);
}

.page-about .compat-note {
  display: block;
  max-height: 0;
  margin-top: 0;
  overflow: hidden;
  opacity: 0;
  font-size: 0.875rem;
  line-height: 1.65;
  color: rgba(36, 27, 23, 0.75);
  transition: max-height var(--t-mid), opacity var(--t-mid), margin-top var(--t-mid);
}

.page-about .compat-cell:hover .compat-note,
.page-about .compat-cell:focus .compat-note,
.page-about .compat-cell:focus-within .compat-note {
  max-height: 9em;
  margin-top: 6px;
  opacity: 1;
}

.page-about .compat-side {
  margin-top: 16px;
  padding: 16px 18px;
  border: 1px dashed var(--about-line);
  border-radius: var(--radius-s);
  background: rgba(231, 215, 194, 0.35);
}

.page-about .compat-side-title {
  margin: 0 0 10px;
  font-size: 11px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--ember);
}

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

.page-about .compat-res li {
  padding: 4px 12px;
  border: 1px solid var(--about-line);
  border-radius: 999px;
  background: var(--cream);
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.04em;
  color: var(--ink);
}

.page-about .compat-side-note {
  margin: 10px 0 0;
  font-size: 0.875rem;
  line-height: 1.65;
  color: rgba(36, 27, 23, 0.72);
}

/* ---------- 服务对象 ---------- */

.page-about .reach-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 14px;
}

.page-about .reach-num {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 200;
  font-size: clamp(3rem, 8vw, 4.4rem);
  line-height: 1;
  letter-spacing: -0.05em;
  color: var(--ember);
}

.page-about .reach-copy {
  margin: 10px 0 0;
  max-width: 46ch;
  font-size: 0.9375rem;
  line-height: 1.75;
  color: rgba(36, 27, 23, 0.85);
}

.page-about .reach-scenes {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 10px;
}

.page-about .reach-scenes li {
  padding: 14px 16px;
  border: 1px solid var(--about-line);
  border-left: 3px solid var(--neon);
  border-radius: var(--radius-s);
  background: var(--cream);
}

.page-about .scene-title {
  margin: 0 0 4px;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 0.9375rem;
  color: var(--ink);
}

.page-about .reach-scenes p:last-child {
  margin: 0;
  font-size: 0.875rem;
  line-height: 1.7;
  color: rgba(36, 27, 23, 0.75);
}

/* ---------- 收尾 ---------- */

.page-about .about-cta {
  position: relative;
  overflow: hidden;
  padding: clamp(24px, 4vw, 44px);
  border: 1px solid rgba(31, 217, 208, 0.4);
  border-radius: var(--radius-m);
  background:
    radial-gradient(circle at 88% 92%, rgba(255, 161, 58, 0.16), transparent 56%),
    linear-gradient(140deg, var(--deep) 0%, var(--midnight) 100%);
  color: var(--hilight);
}

.page-about .about-cta::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(to right, rgba(31, 217, 208, 0.08) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(31, 217, 208, 0.08) 1px, transparent 1px);
  background-size: 48px 48px;
  pointer-events: none;
}

.page-about .about-cta h2,
.page-about .about-cta .cta-lede,
.page-about .about-cta .cta-links {
  position: relative;
}

.page-about .about-cta h2 {
  margin: 0 0 12px;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(1.3rem, 3vw, 1.8rem);
  line-height: 1.3;
  letter-spacing: -0.015em;
  color: #ffffff;
}

.page-about .cta-lede {
  margin: 0 0 clamp(18px, 2.8vw, 26px);
  max-width: 62ch;
  font-size: 0.9375rem;
  line-height: 1.75;
  color: rgba(184, 255, 249, 0.84);
}

.page-about .cta-links {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.page-about .cta-link {
  display: inline-flex;
  align-items: center;
  padding: 10px 20px;
  border: 1px solid rgba(184, 255, 249, 0.42);
  border-radius: 999px;
  color: var(--hilight);
  font-size: 0.9375rem;
  text-decoration: none;
  transition: border-color var(--t-fast), color var(--t-fast), background var(--t-fast);
}

.page-about .cta-link:hover,
.page-about .cta-link:focus-visible {
  border-color: var(--amber);
  color: var(--amber);
}

.page-about .cta-link--primary {
  border-color: var(--amber);
  background: var(--amber);
  color: var(--ink);
  font-weight: 700;
}

.page-about .cta-link--primary:hover,
.page-about .cta-link--primary:focus-visible {
  background: #ffb35f;
  border-color: #ffb35f;
  color: var(--ink);
}

/* ---------- 断点 ---------- */

@media (min-width: 640px) {
  .page-about .origin-points {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

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

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

@media (min-width: 760px) {
  .page-about .about-facts {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

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

  .page-about .team-card--lead {
    grid-column: span 2;
  }

  .page-about .team-card--wide {
    grid-column: span 2;
  }

  .page-about .reach-layout {
    grid-template-columns: minmax(0, 0.85fr) minmax(0, 1.15fr);
    align-items: start;
    gap: 16px;
  }
}

@media (min-width: 1000px) {
  .page-about .about-shell {
    grid-template-columns: 128px minmax(0, 1fr);
    gap: clamp(32px, 4vw, 56px);
  }

  .page-about .about-rail {
    position: sticky;
    top: 96px;
    align-self: start;
    flex-direction: column;
    align-items: stretch;
    gap: 2px;
    overflow: visible;
    padding: 0 0 0 14px;
    border-bottom: 0;
    border-left: 1px solid var(--about-line);
  }

  .page-about .rail-title {
    margin: 0 0 10px;
    padding-left: 4px;
  }

  .page-about .about-rail a {
    border: 0;
    border-radius: 0;
    padding: 5px 4px;
    background: transparent;
  }

  .page-about .about-rail a:hover,
  .page-about .about-rail a:focus-visible {
    background: transparent;
    padding-left: 8px;
  }

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

  .page-about .tl-node {
    padding-left: 56px;
  }

  .page-about .about-timeline::before {
    left: 19px;
  }

  .page-about .tl-node::before {
    left: 13px;
  }

  .page-about .keep-old {
    margin-left: 56px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .tl-card,
  .page-about .team-card,
  .page-about .compat-cell,
  .page-about .compat-note,
  .page-about .cta-link,
  .page-about .about-rail a {
    transition: none;
  }
}
<<<END>>>