.page-about {
  --about-rail: 200px;
  --about-gap: clamp(24px, 4vw, 72px);
  background: var(--c-space);
  color: var(--c-mist);
  font-family: var(--font-sans);
  font-size: var(--fs-body);
  line-height: var(--lh-body);
  padding-bottom: clamp(56px, 8vw, 128px);
}

.page-about .breadcrumbs {
  margin-top: clamp(14px, 2vw, 24px);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  overflow: hidden;
  padding: clamp(36px, 6vw, 96px) 0 clamp(8px, 2vw, 20px);
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  inset: -20% -10% auto -10%;
  height: 120%;
  background:
    radial-gradient(58% 46% at 82% 6%, rgba(33, 230, 208, 0.16), transparent 64%),
    radial-gradient(50% 44% at 6% 84%, rgba(255, 138, 60, 0.13), transparent 62%);
  pointer-events: none;
}

.page-about .about-hero > .shell {
  position: relative;
}

.page-about .about-hero h1 {
  margin: 0 0 clamp(18px, 2.6vw, 30px);
  max-width: 20ch;
  font-size: clamp(34px, 6.2vw, 84px);
  font-weight: 900;
  line-height: 1.04;
  letter-spacing: -0.02em;
}

.page-about .about-hero .lede {
  max-width: 60ch;
  color: var(--c-mist);
  opacity: 0.9;
}

/* ---------- 关键数字带 ---------- */
.page-about .stat-band {
  margin-top: clamp(32px, 5vw, 64px);
  border-top: 1px solid var(--c-line);
  border-bottom: 1px solid var(--c-line);
}

.page-about .stat-band__inner {
  display: flex;
  gap: clamp(22px, 4vw, 64px);
  overflow-x: auto;
  padding: clamp(16px, 2.2vw, 26px) 0;
  scrollbar-width: thin;
}

.page-about .stat {
  flex: 0 0 auto;
  min-width: 132px;
}

.page-about .stat__num {
  display: block;
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: clamp(26px, 3.2vw, 42px);
  font-weight: 700;
  line-height: 1.1;
  color: var(--c-cyan);
}

.page-about .stat--amber .stat__num {
  color: var(--c-amber);
}

.page-about .stat__label {
  display: block;
  margin-top: 6px;
  font-size: var(--fs-label);
  letter-spacing: 0.08em;
  color: var(--c-cold);
}

/* ---------- 章节骨架 ---------- */
.page-about .chapter {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(16px, 3vw, 30px);
  padding: clamp(40px, 6vw, 92px) 0;
}

.page-about .chapter__rail {
  display: flex;
  align-items: baseline;
  gap: 14px;
}

.page-about .chapter__num {
  font-family: var(--font-serif);
  font-size: clamp(38px, 5vw, 74px);
  line-height: 0.9;
  color: var(--c-amber);
  letter-spacing: -0.02em;
}

.page-about .chapter--team .chapter__num,
.page-about .chapter--collection .chapter__num {
  color: var(--c-cyan);
}

.page-about .chapter__tag {
  font-size: var(--fs-label);
  letter-spacing: 0.16em;
  color: var(--c-cold);
  text-transform: uppercase;
}

.page-about .chapter__body {
  max-width: 72ch;
}

.page-about .chapter__body h2 {
  margin: 0 0 clamp(14px, 2vw, 22px);
  font-size: var(--fs-h2);
  font-weight: 800;
  line-height: 1.16;
  letter-spacing: -0.01em;
}

.page-about .chapter__body h3 {
  margin: 0 0 6px;
  font-size: var(--fs-h3);
  font-weight: 700;
  line-height: 1.3;
}

.page-about .chapter__body p {
  margin: 0 0 clamp(14px, 2vw, 20px);
}

.page-about .chapter__note {
  font-size: var(--fs-small);
  color: var(--c-cold);
}

.page-about .chapter__note a {
  color: var(--c-cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(33, 230, 208, 0.4);
  transition: border-color 180ms var(--ease), color 180ms var(--ease);
}

.page-about .chapter__note a:hover {
  color: var(--c-cyan-soft);
  border-bottom-color: var(--c-cyan-soft);
}

/* ---------- 时间轴 ---------- */
.page-about .timeline {
  list-style: none;
  margin: 0 0 clamp(24px, 3vw, 36px);
  padding: 0 0 0 clamp(18px, 2.4vw, 28px);
  border-left: 1px solid var(--c-line);
}

.page-about .timeline__item {
  position: relative;
  padding-bottom: clamp(22px, 3vw, 32px);
}

.page-about .timeline__item:last-child {
  padding-bottom: 0;
}

.page-about .timeline__item::before {
  content: "";
  position: absolute;
  left: calc(-1 * clamp(18px, 2.4vw, 28px) - 4px);
  top: 0.62em;
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--c-amber);
  box-shadow: 0 0 0 4px rgba(255, 138, 60, 0.14);
}

.page-about .timeline__year {
  display: block;
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: var(--fs-small);
  letter-spacing: 0.1em;
  color: var(--c-amber);
}

.page-about .timeline__title {
  font-size: var(--fs-h3);
  font-weight: 700;
  margin: 4px 0 4px;
}

.page-about .timeline__text {
  margin: 0;
  color: var(--c-cold);
  font-size: var(--fs-small);
  line-height: 1.7;
}

/* ---------- 图片 ---------- */
.page-about .about-figure {
  margin: 0 0 clamp(22px, 3vw, 34px);
}

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

.page-about .about-figure--portrait {
  max-width: 380px;
}

.page-about .about-figure__caption {
  margin-top: 10px;
  font-family: var(--font-serif);
  font-size: var(--fs-small);
  color: var(--c-cold);
}

/* ---------- 角色矩阵 ---------- */
.page-about .roles {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1px;
  background: var(--c-line);
  border: 1px solid var(--c-line);
}

.page-about .role {
  background: var(--c-midnight);
  padding: clamp(18px, 2.2vw, 26px);
  transition: background 200ms var(--ease), box-shadow 200ms var(--ease);
}

.page-about .role:hover,
.page-about .role:focus-within {
  background: var(--c-abyss);
  box-shadow: inset 0 0 0 1px var(--c-cyan);
}

.page-about .role__name {
  margin: 0 0 4px;
  font-size: var(--fs-h3);
  font-weight: 700;
}

.page-about .role__num {
  display: inline-block;
  margin: 0 0 10px;
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: var(--fs-label);
  letter-spacing: 0.08em;
  color: var(--c-cyan);
  border: 1px solid rgba(33, 230, 208, 0.35);
  border-radius: var(--radius);
  padding: 2px 8px;
}

.page-about .role__text {
  margin: 0;
  font-size: var(--fs-small);
  line-height: 1.7;
  color: var(--c-cold);
}

/* ---------- 服务覆盖 ---------- */
.page-about .coverage {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(16px, 2.4vw, 26px);
  margin-bottom: clamp(18px, 2.4vw, 26px);
}

.page-about .coverage__item {
  border-top: 1px solid var(--c-line);
  padding-top: 14px;
}

.page-about .coverage__k {
  display: block;
  font-size: var(--fs-label);
  letter-spacing: 0.08em;
  color: var(--c-cold);
  margin-bottom: 6px;
}

.page-about .coverage__v {
  display: block;
  font-size: var(--fs-h3);
  font-weight: 800;
  letter-spacing: -0.01em;
}

/* ---------- 收藏面板 ---------- */
.page-about .collect-panel {
  border: 1px solid var(--c-line);
  background: linear-gradient(140deg, rgba(255, 209, 102, 0.08), rgba(14, 26, 60, 0.9) 62%);
  border-radius: var(--radius);
  padding: clamp(20px, 2.8vw, 34px);
  margin-bottom: clamp(16px, 2.2vw, 22px);
}

.page-about .collect-panel__head {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-bottom: clamp(14px, 2vw, 20px);
}

.page-about .collect-list {
  list-style: none;
  margin: 0;
  padding: 0;
}

.page-about .collect-list li {
  position: relative;
  padding: 0 0 12px 22px;
  font-size: var(--fs-small);
  line-height: 1.75;
  color: var(--c-mist);
}

.page-about .collect-list li:last-child {
  padding-bottom: 0;
}

.page-about .collect-list li::before {
  content: "";
  position: absolute;
  left: 2px;
  top: 0.62em;
  width: 8px;
  height: 8px;
  background: var(--c-glow);
  clip-path: polygon(50% 0%, 61% 35%, 98% 35%, 68% 57%, 79% 91%, 50% 70%, 21% 91%, 32% 57%, 2% 35%, 39% 35%);
  opacity: 0.85;
}

/* ---------- 三条标准 ---------- */
.page-about .principles {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(24px, 3vw, 36px);
}

.page-about .principle {
  border-top: 2px solid var(--c-line);
  padding-top: clamp(16px, 2.2vw, 24px);
}

.page-about .principle--p1 {
  border-top-color: var(--c-amber);
}

.page-about .principle--p2 {
  border-top-color: var(--c-cyan);
}

.page-about .principle--p3 {
  border-top-color: var(--c-glow);
}

.page-about .principle__index {
  display: block;
  font-family: var(--font-serif);
  font-size: clamp(24px, 3vw, 34px);
  line-height: 1;
  color: var(--c-cold);
  margin-bottom: 10px;
}

.page-about .principle h3 {
  margin: 0 0 8px;
  font-size: var(--fs-h3);
  font-weight: 800;
}

.page-about .principle p {
  margin: 0;
  font-size: var(--fs-small);
  line-height: 1.75;
  color: var(--c-cold);
}

/* ---------- 收束行动区 ---------- */
.page-about .about-cta {
  margin-top: clamp(36px, 5vw, 72px);
}

.page-about .about-cta__inner {
  border: 1px solid var(--c-line);
  border-radius: var(--radius);
  background: linear-gradient(120deg, rgba(33, 230, 208, 0.09), rgba(255, 138, 60, 0.09) 78%);
  padding: clamp(26px, 4vw, 56px);
  display: grid;
  gap: clamp(20px, 3vw, 32px);
  grid-template-columns: 1fr;
}

.page-about .about-cta__copy h2 {
  margin: 0 0 12px;
  font-size: var(--fs-h2);
  font-weight: 800;
  line-height: 1.18;
  letter-spacing: -0.01em;
}

.page-about .about-cta__copy p {
  margin: 0;
  max-width: 46ch;
  color: var(--c-cold);
  font-size: var(--fs-small);
  line-height: 1.75;
}

.page-about .about-cta__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  align-items: center;
}

/* ---------- 响应式 ---------- */
@media (min-width: 640px) {
  .page-about .roles {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

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

  .page-about .about-figure--portrait {
    max-width: 420px;
  }
}

@media (min-width: 900px) {
  .page-about .principles {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: clamp(20px, 2.4vw, 34px);
  }

  .page-about .about-cta__inner {
    grid-template-columns: minmax(0, 1.1fr) auto;
    align-items: center;
  }

  .page-about .about-cta__actions {
    justify-content: flex-end;
  }
}

@media (min-width: 960px) {
  .page-about .chapter {
    grid-template-columns: var(--about-rail) minmax(0, 1fr);
    gap: var(--about-gap);
  }

  .page-about .chapter__rail {
    flex-direction: column;
    gap: 10px;
    position: sticky;
    top: calc(var(--header-h) + 28px);
    align-self: start;
  }

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

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

  .page-about .timeline {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    column-gap: clamp(24px, 3vw, 44px);
    row-gap: 0;
  }
}

@media (min-width: 1200px) {
  .page-about .about-hero h1 {
    max-width: 18ch;
  }
}
</PAGE_CSS>>>