.page-about {
  --about-rail-w: 44px;
  --about-gap: clamp(12px, 2vw, 32px);
  background: var(--night);
  color: var(--ice);
  font-family: var(--font-body);
  overflow-x: clip;
}

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

/* ============ 首屏 ============ */

.page-about .about-hero {
  position: relative;
  isolation: isolate;
  padding-block: clamp(28px, 4vw, 52px) clamp(40px, 6vw, 84px);
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  left: -12%;
  right: -12%;
  top: -34%;
  height: 150%;
  background:
    radial-gradient(120% 90% at 10% 4%, rgba(34, 224, 200, 0.15), transparent 60%),
    radial-gradient(90% 70% at 98% 24%, rgba(255, 106, 43, 0.09), transparent 58%);
  clip-path: polygon(0 0, 100% 0, 100% 70%, 0 100%);
  z-index: -1;
  pointer-events: none;
}

.page-about .about-hero .breadcrumb {
  margin-bottom: clamp(24px, 4vw, 52px);
}

.page-about .about-hero-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(28px, 5vw, 48px);
  align-items: end;
}

.page-about .about-hero-lead h1 {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(38px, 9.4vw, 104px);
  line-height: 0.94;
  letter-spacing: -0.02em;
  color: var(--ice);
  margin: 0 0 clamp(18px, 2.6vw, 30px);
}

.page-about .about-hero-lead .kicker {
  margin: 0 0 clamp(14px, 2vw, 22px);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.26em;
  color: var(--cyan);
}

.page-about .about-hero-copy {
  max-width: 44ch;
  margin: 0 0 0.9em;
  font-size: clamp(15px, 0.9vw + 12.5px, 17px);
  line-height: 1.85;
  color: var(--mist);
}

.page-about .about-hero-copy + .about-hero-copy {
  color: var(--ice);
}

.page-about .about-hero-side {
  display: flex;
  align-items: flex-start;
  gap: clamp(14px, 2.4vw, 28px);
}

.page-about .about-hero-side .annotation--v {
  flex: 0 0 auto;
  color: var(--mist);
  font-size: 11px;
  letter-spacing: 0.24em;
}

.page-about .about-hero-note {
  padding: 12px 14px;
  background: var(--panel);
  border-left: 2px solid var(--orange);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 14px), calc(100% - 14px) 100%, 0 100%);
}

.page-about .about-hero-note-label {
  margin: 0 0 6px;
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.22em;
  color: var(--orange);
}

.page-about .about-hero-note-text {
  margin: 0;
  font-size: 13px;
  line-height: 1.6;
  color: var(--ice);
}

/* 首屏关键数字条 */

.page-about .about-stats {
  position: relative;
  list-style: none;
  margin: clamp(38px, 6vw, 76px) 0 0;
  padding: clamp(26px, 3.4vw, 40px) 0 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: clamp(20px, 3vw, 38px);
}

.page-about .about-stats::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: clamp(90px, 24vw, 280px);
  height: 2px;
  background: repeating-linear-gradient(90deg, var(--cyan) 0 12px, transparent 12px 24px);
}

.page-about .stat-num {
  display: block;
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-weight: 700;
  font-size: clamp(30px, 5.4vw, 54px);
  line-height: 1;
  letter-spacing: -0.01em;
  color: var(--cyan);
}

.page-about .stat-cap {
  display: block;
  margin-top: 10px;
  font-size: 12px;
  letter-spacing: 0.16em;
  color: var(--mist);
}

/* ============ 章节轨道 ============ */

.page-about .about-track {
  padding-bottom: clamp(40px, 6vw, 90px);
}

.page-about .about-chapter {
  position: relative;
  display: grid;
  grid-template-columns: var(--about-rail-w) minmax(0, 1fr);
  column-gap: var(--about-gap);
  padding-block: clamp(34px, 5vw, 70px);
}

.page-about .about-chapter::before {
  content: "";
  position: absolute;
  left: calc(var(--about-rail-w) / 2 - 1px);
  top: 0;
  bottom: 0;
  width: 2px;
  background: var(--steel);
  opacity: 0.55;
  pointer-events: none;
}

.page-about .about-chapter:last-child::before {
  background: linear-gradient(to bottom, var(--steel), transparent);
}

.page-about .chapter-rail {
  position: relative;
  padding-top: 4px;
}

.page-about .chapter-num {
  display: inline-grid;
  place-items: center;
  width: 40px;
  height: 40px;
  background: var(--night);
  border: 1px solid var(--steel);
  clip-path: polygon(0 0, 100% 0, 100% 70%, 70% 100%, 0 100%);
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.04em;
  color: var(--mist);
  transition: color var(--dur) var(--ease), background-color var(--dur) var(--ease), border-color var(--dur) var(--ease);
}

.page-about .about-chapter.is-current .chapter-num {
  background: var(--cyan);
  border-color: var(--cyan);
  color: var(--night);
}

.page-about .chapter-body {
  min-width: 0;
}

.page-about .chapter-tag {
  margin: 0 0 12px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.24em;
  color: var(--cyan);
}

.page-about .chapter-body h2 {
  margin: 0 0 clamp(16px, 2.2vw, 26px);
  max-width: 20ch;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(25px, 3.6vw, 46px);
  line-height: 1.14;
  letter-spacing: -0.01em;
  color: var(--ice);
}

.page-about .chapter-body p {
  max-width: 44em;
  margin: 0 0 1em;
  font-size: clamp(15px, 0.7vw + 12.6px, 17px);
  line-height: 1.85;
  color: var(--mist);
}

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

.page-about .chapter-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: clamp(20px, 2.6vw, 30px);
}

/* ============ 02 版本 ============ */

.page-about .version-figure {
  margin: clamp(20px, 3vw, 34px) 0 clamp(24px, 3.4vw, 40px);
  background: var(--carbon);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 26px), calc(100% - 26px) 100%, 0 100%);
  overflow: hidden;
}

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

.page-about .version-figure figcaption {
  padding: 10px clamp(14px, 2vw, 22px) 14px;
  font-size: 11px;
  letter-spacing: 0.18em;
  color: var(--mist);
}

.page-about .version-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: clamp(14px, 2vw, 24px);
}

.page-about .version-item {
  position: relative;
  padding: clamp(18px, 2.4vw, 30px) clamp(18px, 2.4vw, 30px) clamp(20px, 2.6vw, 32px) clamp(24px, 3vw, 38px);
  background: linear-gradient(135deg, var(--panel), var(--carbon));
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 20px), calc(100% - 20px) 100%, 0 100%);
}

.page-about .version-item::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 3px;
  background: var(--steel);
}

.page-about .version-item:last-child::before {
  background: var(--cyan);
}

.page-about .version-tag {
  display: block;
  margin-bottom: 8px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.2em;
  color: var(--orange);
}

.page-about .version-item h3 {
  margin: 0 0 10px;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(18px, 1.8vw, 24px);
  line-height: 1.3;
  color: var(--ice);
}

.page-about .version-item p {
  margin: 0;
  max-width: 46em;
  font-size: 15px;
  line-height: 1.8;
  color: var(--mist);
}

/* ============ 03 团队 ============ */

.page-about .chapter-split {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(22px, 3vw, 36px);
  align-items: start;
}

.page-about .shift-list {
  list-style: none;
  margin: clamp(18px, 2.4vw, 28px) 0 0;
  padding: 0;
  display: grid;
  gap: 2px;
}

.page-about .shift-list li {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 6px;
  padding: 14px clamp(14px, 2vw, 20px);
  background: var(--panel);
  border-left: 2px solid var(--steel);
}

.page-about .shift-list li:nth-child(3) {
  border-left-color: var(--orange);
}

.page-about .shift-time {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.18em;
  color: var(--cyan);
}

.page-about .shift-list p {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.75;
  color: var(--mist);
}

.page-about .team-figure {
  margin: 0;
  background: var(--carbon);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 24px), calc(100% - 24px) 100%, 0 100%);
  overflow: hidden;
}

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

.page-about .team-figure figcaption {
  padding: 10px clamp(14px, 2vw, 20px) 14px;
  font-size: 11px;
  letter-spacing: 0.18em;
  color: var(--mist);
}

/* ============ 04 覆盖 ============ */

.page-about .cover-figure {
  margin: clamp(20px, 3vw, 34px) 0 clamp(22px, 3vw, 34px);
  position: relative;
  background: var(--panel);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 30px), calc(100% - 30px) 100%, 0 100%);
  overflow: hidden;
}

.page-about .cover-figure::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, rgba(5, 11, 26, 0.1) 40%, rgba(5, 11, 26, 0.82) 100%);
  pointer-events: none;
}

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

.page-about .cover-stats {
  list-style: none;
  margin: 0 0 clamp(22px, 3vw, 34px);
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 2px;
}

.page-about .cover-stats li {
  padding: clamp(16px, 2.2vw, 24px);
  background: var(--carbon);
}

.page-about .cover-stats li:nth-child(2n) {
  background: var(--panel);
}

.page-about .cover-num {
  display: block;
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-weight: 700;
  font-size: clamp(26px, 3.4vw, 40px);
  line-height: 1;
  color: var(--cyan);
}

.page-about .cover-cap {
  display: block;
  margin-top: 10px;
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--mist);
}

/* ============ 05 数据 ============ */

.page-about .data-callout {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 10px;
  margin-top: clamp(20px, 2.8vw, 32px);
  padding: clamp(18px, 2.4vw, 28px) clamp(18px, 2.4vw, 30px);
  background: var(--panel);
  border-left: 3px solid var(--cyan);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 22px), calc(100% - 22px) 100%, 0 100%);
}

.page-about .data-callout-num {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-weight: 700;
  font-size: clamp(26px, 3.2vw, 38px);
  line-height: 1;
  color: var(--orange);
}

.page-about .data-callout p {
  margin: 0;
  max-width: 46em;
  font-size: 14.5px;
  line-height: 1.8;
  color: var(--mist);
}

/* ============ 收尾 ============ */

.page-about .about-cta {
  position: relative;
  padding-block: clamp(44px, 6vw, 90px);
  background: var(--panel);
  clip-path: polygon(0 34px, 100% 0, 100% 100%, 0 100%);
}

.page-about .about-cta-inner {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(22px, 3vw, 40px);
  align-items: center;
}

.page-about .about-cta h2 {
  margin: 0 0 12px;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(24px, 3.4vw, 42px);
  line-height: 1.16;
  color: var(--ice);
}

.page-about .about-cta p {
  margin: 0;
  max-width: 46ch;
  font-size: 15px;
  line-height: 1.8;
  color: var(--mist);
}

.page-about .about-cta .kicker {
  margin: 0 0 12px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.26em;
  color: var(--cyan);
}

.page-about .about-cta-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

/* ============ 响应式 ============ */

@media (min-width: 640px) {
  .page-about .about-stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .page-about .cover-stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .page-about .shift-list li {
    grid-template-columns: 168px minmax(0, 1fr);
    align-items: baseline;
    gap: 16px;
  }

  .page-about .data-callout {
    grid-template-columns: auto minmax(0, 1fr);
    align-items: baseline;
    column-gap: clamp(18px, 2.6vw, 30px);
  }
}

@media (min-width: 900px) {
  .page-about {
    --about-rail-w: 76px;
    --about-gap: clamp(24px, 2.6vw, 44px);
  }

  .page-about .about-hero-grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 3fr);
  }

  .page-about .about-hero-side {
    flex-direction: row-reverse;
    justify-content: flex-start;
  }

  .page-about .chapter-num {
    width: 48px;
    height: 48px;
    font-size: 14px;
  }

  .page-about .chapter-split {
    grid-template-columns: minmax(0, 1fr) minmax(0, 0.82fr);
  }

  .page-about .about-cta-inner {
    grid-template-columns: minmax(0, 1fr) auto;
  }
}

@media (min-width: 1200px) {
  .page-about .about-hero-lead h1 {
    max-width: 16ch;
  }

  .page-about .version-item {
    padding-right: clamp(30px, 4vw, 56px);
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .chapter-num {
    transition: none;
  }
}
<<<END>>>