.page-about {
  --about-line: rgba(139, 147, 167, 0.28);
  --about-cyan-soft: rgba(34, 224, 214, 0.12);
  --about-cut: 2px 24px 2px 24px;
  background: var(--space);
  color: var(--ink);
  font-family: var(--font-body);
  font-size: var(--step-0);
  line-height: 1.75;
  overflow-x: clip;
}

.page-about .shell {
  width: 100%;
  max-width: var(--shell);
  margin-inline: auto;
  padding-inline: var(--pad);
}

.page-about h1,
.page-about h2,
.page-about h3 {
  font-family: var(--font-display);
  letter-spacing: -0.01em;
  line-height: 1.1;
  margin: 0;
}

.page-about p {
  margin: 0 0 1em;
}

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

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

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  padding: clamp(28px, 5vw, 52px) 0 clamp(36px, 6vw, 64px);
  border-bottom: 1px solid var(--about-line);
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background:
    repeating-linear-gradient(115deg, rgba(34, 224, 214, 0.05) 0 1px, transparent 1px 20px),
    radial-gradient(120% 90% at 85% 0%, rgba(122, 92, 255, 0.22), transparent 62%),
    radial-gradient(90% 80% at 0% 100%, rgba(201, 139, 107, 0.16), transparent 60%);
}

.page-about .about-hero .shell {
  position: relative;
  z-index: 1;
}

.page-about .about-crumb ol {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  list-style: none;
  margin: 0 0 clamp(24px, 4vw, 44px);
  padding: 0;
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.04em;
  color: var(--rock);
}

.page-about .about-crumb li {
  display: flex;
  align-items: center;
  gap: 8px;
}

.page-about .about-crumb li + li::before {
  content: "/";
  color: rgba(139, 147, 167, 0.6);
}

.page-about .about-crumb a {
  color: var(--ink-dim);
  text-decoration: none;
}

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

.page-about .about-crumb [aria-current="page"] {
  color: var(--cream);
}

.page-about .about-hero-grid {
  display: grid;
  gap: clamp(20px, 3vw, 40px);
}

.page-about .about-hero-kicker {
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.28em;
  text-transform: uppercase;
  color: var(--clay);
  margin: 0 0 10px;
}

.page-about .about-hero h1 {
  font-size: clamp(52px, 12vw, 128px);
  font-weight: 700;
  letter-spacing: -0.03em;
  color: var(--cream);
  margin-bottom: clamp(14px, 2vw, 24px);
}

.page-about .about-hero-lead {
  max-width: 62ch;
  font-size: var(--step-1);
  line-height: 1.7;
  color: var(--ink-dim);
  margin: 0;
}

.page-about .about-hero-years {
  display: flex;
  align-items: baseline;
  gap: 14px;
  font-family: var(--font-mono);
  font-weight: 700;
  letter-spacing: -0.05em;
  line-height: 0.85;
  color: transparent;
  -webkit-text-stroke: 1px rgba(139, 147, 167, 0.45);
  font-size: clamp(40px, 9vw, 84px);
}

.page-about .about-hero-year.is-latest {
  -webkit-text-stroke: 1px rgba(255, 138, 61, 0.7);
  color: transparent;
}

.page-about .about-hero-stats {
  list-style: none;
  margin: clamp(28px, 5vw, 52px) 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--about-line);
  border: 1px solid var(--about-line);
  border-radius: var(--about-cut);
  overflow: hidden;
}

.page-about .about-hero-stats li {
  display: flex;
  flex-direction: column;
  gap: 4px;
  padding: 16px 18px;
  background: rgba(16, 31, 66, 0.9);
}

.page-about .about-stat-value {
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: clamp(22px, 3.2vw, 30px);
  letter-spacing: -0.02em;
  color: var(--cream);
  line-height: 1.2;
}

.page-about .about-stat-value.is-warm {
  color: var(--orange);
}

.page-about .about-stat-label {
  font-size: 13px;
  color: var(--rock);
  line-height: 1.5;
}

/* ---------- 主体骨架 ---------- */
.page-about .about-body {
  display: grid;
  gap: clamp(24px, 4vw, 48px);
  padding-block: clamp(32px, 6vw, 72px) clamp(48px, 8vw, 96px);
}

.page-about .about-index {
  align-self: start;
}

.page-about .about-index-title {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--moss);
  margin: 0 0 12px;
}

.page-about .about-index ul {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  gap: 8px;
  overflow-x: auto;
  scrollbar-width: thin;
}

.page-about .about-index li {
  flex: 0 0 auto;
}

.page-about .about-index a {
  display: block;
  padding: 7px 14px;
  border: 1px solid var(--about-line);
  border-radius: 999px;
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--ink-dim);
  text-decoration: none;
  white-space: nowrap;
  transition: color 0.2s var(--ease), border-color 0.2s var(--ease), background 0.2s var(--ease);
}

.page-about .about-index a:hover,
.page-about .about-index a:focus-visible {
  color: var(--cyan);
  border-color: var(--line-cyan);
  background: rgba(34, 224, 214, 0.08);
}

/* ---------- 纵向轨道 ---------- */
.page-about .about-track {
  position: relative;
  min-width: 0;
}

.page-about .about-track::before {
  content: "";
  position: absolute;
  left: 6px;
  top: 10px;
  bottom: 40px;
  width: 2px;
  background: linear-gradient(180deg, var(--cyan) 0%, var(--violet) 45%, var(--clay) 78%, rgba(201, 139, 107, 0) 100%);
  opacity: 0.75;
}

.page-about .about-chapter {
  position: relative;
  padding-left: 26px;
  padding-bottom: clamp(40px, 7vw, 84px);
}

.page-about .about-chapter::before {
  content: "";
  position: absolute;
  left: 0;
  top: 8px;
  width: 14px;
  height: 14px;
  border-radius: 50%;
  background: var(--space);
  border: 2px solid var(--cyan);
  box-shadow: 0 0 0 4px var(--about-cyan-soft);
}

.page-about .about-chapter-head {
  margin-bottom: clamp(16px, 2.5vw, 26px);
}

.page-about .about-chapter-tag {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--moss);
  margin-bottom: 10px;
}

.page-about .about-chapter-year {
  display: block;
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: clamp(38px, 8vw, 68px);
  line-height: 0.9;
  letter-spacing: -0.04em;
  color: rgba(139, 147, 167, 0.35);
  margin-bottom: 6px;
}

.page-about .about-chapter-title {
  font-size: clamp(26px, 4.4vw, 46px);
  color: var(--cream);
  letter-spacing: -0.02em;
  max-width: 22ch;
}

.page-about .about-lead {
  max-width: 64ch;
  color: var(--ink-dim);
  margin: 0 0 clamp(20px, 3vw, 32px);
}

.page-about .about-chapter-body {
  display: grid;
  gap: clamp(16px, 2.5vw, 24px);
}

.page-about .about-board {
  background: var(--navy);
  border: 1px solid var(--about-line);
  border-radius: var(--about-cut);
  padding: clamp(18px, 3vw, 32px);
  color: var(--ink-dim);
}

.page-about .about-board p {
  max-width: 68ch;
}

.page-about .about-note {
  border-left: 2px solid var(--clay);
  padding: 2px 0 2px 16px;
  color: var(--rock);
  font-size: 15px;
  line-height: 1.75;
}

.page-about .about-note p {
  margin: 0;
}

.page-about .about-figure {
  margin: 0;
  position: relative;
  border: 1px solid var(--about-line);
  border-radius: var(--about-cut);
  overflow: hidden;
  background: var(--navy);
}

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

.page-about .about-figure figcaption {
  font-family: var(--font-mono);
  font-size: 12px;
  line-height: 1.6;
  color: var(--rock);
  padding: 10px 16px;
  border-top: 1px solid var(--about-line);
  background: rgba(10, 22, 51, 0.6);
}

/* ---------- 版本轨道 ---------- */
.page-about .about-milestones {
  list-style: none;
  margin: 0 0 clamp(24px, 4vw, 40px);
  padding: 0;
  display: grid;
  gap: 10px;
}

.page-about .about-milestone {
  display: grid;
  grid-template-columns: 1fr;
  gap: 6px;
  padding: 16px 18px;
  background: linear-gradient(120deg, rgba(16, 31, 66, 0.95), rgba(10, 22, 51, 0.6));
  border: 1px solid var(--about-line);
  border-left: 2px solid rgba(34, 224, 214, 0.5);
  border-radius: 2px 16px 2px 16px;
  transition: border-color 0.25s var(--ease), transform 0.25s var(--ease), background 0.25s var(--ease);
}

.page-about .about-milestone:hover,
.page-about .about-milestone:focus-within {
  border-color: var(--line-cyan);
  border-left-color: var(--cyan);
  transform: translateX(4px);
  background: linear-gradient(120deg, rgba(16, 31, 66, 1), rgba(122, 92, 255, 0.14));
}

.page-about .about-milestone.is-latest {
  border-left-color: var(--orange);
  background: linear-gradient(120deg, rgba(255, 138, 61, 0.12), rgba(16, 31, 66, 0.95) 45%);
}

.page-about .about-milestone-year {
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: clamp(20px, 3vw, 26px);
  letter-spacing: -0.02em;
  color: var(--rock);
  line-height: 1;
}

.page-about .about-milestone.is-latest .about-milestone-year {
  color: var(--orange);
}

.page-about .about-milestone-body h3 {
  font-size: clamp(17px, 2.2vw, 21px);
  color: var(--cream);
  font-family: var(--font-body);
  font-weight: 700;
  letter-spacing: 0;
  margin-bottom: 4px;
}

.page-about .about-milestone-more {
  margin: 0;
  font-size: 15px;
  line-height: 1.7;
  color: var(--ink-dim);
  opacity: 0.85;
  transition: opacity 0.25s var(--ease);
}

.page-about .about-milestone:hover .about-milestone-more {
  opacity: 1;
}

/* ---------- 内容生产流程 ---------- */
.page-about .about-steps {
  list-style: none;
  counter-reset: about-step;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 14px;
}

.page-about .about-steps li {
  counter-increment: about-step;
  position: relative;
  padding-left: 44px;
}

.page-about .about-steps li::before {
  content: counter(about-step, decimal-leading-zero);
  position: absolute;
  left: 0;
  top: 0;
  font-family: var(--font-mono);
  font-size: 15px;
  font-weight: 700;
  color: var(--violet);
  padding-top: 1px;
}

.page-about .about-steps h3 {
  font-family: var(--font-body);
  font-size: 17px;
  font-weight: 700;
  color: var(--cream);
  margin-bottom: 4px;
  letter-spacing: 0;
}

.page-about .about-steps p {
  margin: 0;
  font-size: 15px;
}

/* ---------- 团队 ---------- */
.page-about .about-cities {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 18px 0;
  padding: 0;
}

.page-about .about-cities li {
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.08em;
  padding: 6px 14px;
  border-radius: 999px;
  border: 1px solid rgba(110, 139, 106, 0.55);
  color: var(--cream);
  background: rgba(110, 139, 106, 0.16);
}

.page-about .about-team-stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
  padding-top: 16px;
  border-top: 1px solid var(--about-line);
}

.page-about .about-team-stats > div {
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.page-about .about-num {
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: clamp(26px, 4vw, 34px);
  line-height: 1.1;
  color: var(--orange);
  letter-spacing: -0.02em;
}

.page-about .about-num-label {
  font-size: 13px;
  color: var(--rock);
}

/* ---------- 资质 ---------- */
.page-about .about-cred {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 1px;
  background: var(--about-line);
  border: 1px solid var(--about-line);
  border-radius: var(--about-cut);
  overflow: hidden;
}

.page-about .about-cred li {
  padding: clamp(16px, 2.4vw, 24px);
  background: rgba(16, 31, 66, 0.92);
}

.page-about .about-cred h3 {
  font-family: var(--font-body);
  font-size: 17px;
  font-weight: 700;
  letter-spacing: 0;
  color: var(--cyan);
  margin-bottom: 6px;
}

.page-about .about-cred p {
  margin: 0;
  font-size: 15px;
  color: var(--ink-dim);
}

/* ---------- 规模 ---------- */
.page-about .about-metrics {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--about-line);
  border: 1px solid var(--about-line);
  border-radius: var(--about-cut);
  overflow: hidden;
  margin-bottom: clamp(18px, 3vw, 28px);
}

.page-about .about-metric {
  display: flex;
  flex-direction: column;
  gap: 4px;
  padding: clamp(16px, 2.6vw, 26px);
  background: rgba(10, 22, 51, 0.92);
}

.page-about .about-metric:nth-child(3n + 2) {
  background: rgba(16, 31, 66, 0.94);
}

.page-about .about-metric-value {
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: clamp(24px, 4vw, 38px);
  line-height: 1.1;
  letter-spacing: -0.03em;
  color: var(--cream);
}

.page-about .about-metric:nth-child(3n + 1) .about-metric-value {
  color: var(--orange);
}

.page-about .about-metric-label {
  font-size: 13px;
  color: var(--rock);
}

.page-about .about-tail {
  color: var(--ink-dim);
  max-width: 66ch;
  border-left: 2px solid var(--moss);
  padding-left: 16px;
  font-size: 15px;
}

/* ---------- 收尾 ---------- */
.page-about .about-cta {
  position: relative;
  padding: clamp(26px, 4vw, 44px);
  border: 1px solid var(--line-violet);
  border-radius: var(--about-cut);
  background:
    radial-gradient(110% 120% at 100% 0%, rgba(122, 92, 255, 0.24), transparent 60%),
    linear-gradient(160deg, rgba(16, 31, 66, 0.96), rgba(10, 22, 51, 0.96));
}

.page-about .about-cta h2 {
  font-size: clamp(24px, 4vw, 38px);
  color: var(--cream);
  margin-bottom: 10px;
}

.page-about .about-cta p {
  color: var(--ink-dim);
  max-width: 64ch;
}

.page-about .about-cta-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin: clamp(18px, 3vw, 26px) 0 14px;
}

.page-about .about-btn {
  display: inline-block;
  padding: 11px 24px;
  border-radius: 999px;
  font-family: var(--font-mono);
  font-size: 14px;
  letter-spacing: 0.04em;
  text-decoration: none;
  background: var(--cyan);
  color: var(--space);
  font-weight: 700;
  border: 1px solid var(--cyan);
  transition: transform 0.2s var(--ease), background 0.2s var(--ease), color 0.2s var(--ease);
}

.page-about .about-btn:hover,
.page-about .about-btn:focus-visible {
  transform: translateY(-2px);
  background: var(--lime);
  border-color: var(--lime);
}

.page-about .about-btn--ghost {
  background: transparent;
  color: var(--cyan);
  border-color: var(--line-cyan);
}

.page-about .about-btn--ghost:hover,
.page-about .about-btn--ghost:focus-visible {
  background: rgba(34, 224, 214, 0.12);
  color: var(--cream);
  border-color: var(--cyan);
}

.page-about .about-cta-links {
  font-size: 14px;
  color: var(--rock);
  margin: 0;
}

.page-about .about-cta-links a {
  color: var(--cyan);
  text-underline-offset: 3px;
}

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

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

  .page-about .about-chapter-body {
    grid-template-columns: minmax(0, 1.55fr) minmax(0, 1fr);
    align-items: start;
  }

  .page-about .about-chapter-body > .about-note {
    margin-top: clamp(24px, 4vw, 48px);
  }

  .page-about .about-chapter-body > .about-figure {
    margin-top: clamp(10px, 2vw, 26px);
  }

  .page-about .about-milestone {
    grid-template-columns: 96px minmax(0, 1fr);
    align-items: baseline;
    gap: 18px;
    padding: 18px 22px;
  }

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

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

@media (min-width: 960px) {
  .page-about .about-hero-grid {
    grid-template-columns: minmax(0, 1fr) auto;
    align-items: end;
  }

  .page-about .about-hero-years {
    flex-direction: column;
    align-items: flex-end;
    gap: 0;
    font-size: clamp(56px, 8vw, 104px);
  }

  .page-about .about-body {
    grid-template-columns: 190px minmax(0, 1fr);
    gap: clamp(32px, 5vw, 64px);
  }

  .page-about .about-index {
    position: sticky;
    top: 108px;
  }

  .page-about .about-index ul {
    flex-direction: column;
    overflow: visible;
    gap: 6px;
  }

  .page-about .about-index a {
    border-radius: 2px 14px 2px 14px;
  }

  .page-about .about-track::before {
    left: 8px;
  }

  .page-about .about-chapter {
    padding-left: 48px;
  }

  .page-about .about-chapter::before {
    width: 18px;
    height: 18px;
    top: 10px;
  }

  .page-about .about-chapter-title {
    max-width: 26ch;
  }

  .page-about .about-figure--wide {
    margin-top: clamp(24px, 4vw, 40px);
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-milestone,
  .page-about .about-milestone-more,
  .page-about .about-btn,
  .page-about .about-index a {
    transition: none;
  }

  .page-about .about-milestone:hover,
  .page-about .about-milestone:focus-within {
    transform: none;
  }

  .page-about .about-btn:hover,
  .page-about .about-btn:focus-visible {
    transform: none;
  }
}
<<<END>>>