.page-about {
  --about-edge: rgba(200, 150, 62, 0.42);
  --about-prose: 66ch;
  background: var(--c-snow);
  color: var(--c-text);
}

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

.page-about [id] {
  scroll-margin-top: 88px;
}

/* ---------- 首屏框景 ---------- */
.page-about .about-hero {
  position: relative;
  overflow: hidden;
  color: var(--c-snow);
  background-color: var(--c-indigo);
  background-image:
    repeating-linear-gradient(90deg, rgba(245, 247, 250, 0.05) 0 1px, transparent 1px 80px),
    repeating-linear-gradient(0deg, rgba(245, 247, 250, 0.04) 0 1px, transparent 1px 80px),
    radial-gradient(130% 100% at 12% -10%, #2a3d63 0%, var(--c-indigo) 48%, var(--c-ink) 100%);
  padding-block: clamp(18px, 3.4vw, 34px) clamp(28px, 4.5vw, 56px);
}

.page-about .breadcrumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  color: var(--c-mist);
}

.page-about .breadcrumb a {
  color: var(--c-mist);
  text-decoration: none;
  border-bottom: 1px solid rgba(143, 163, 191, 0.45);
  padding-bottom: 1px;
  transition: color 0.2s var(--ease);
}

.page-about .breadcrumb a:hover {
  color: var(--c-copper-lift);
}

.page-about .breadcrumb .crumb-sep {
  color: rgba(143, 163, 191, 0.6);
}

.page-about .breadcrumb span[aria-current="page"] {
  color: var(--c-snow);
}

.page-about .hero-frame {
  position: relative;
  margin-top: clamp(16px, 3vw, 30px);
  padding: clamp(20px, 3.6vw, 46px) clamp(18px, 3.4vw, 44px);
  border: 1px solid var(--about-edge);
  background: linear-gradient(180deg, rgba(15, 26, 46, 0.55), rgba(15, 26, 46, 0.16));
}

.page-about .hero-frame::before,
.page-about .hero-frame::after {
  content: "";
  position: absolute;
  width: 9px;
  height: 9px;
  background: var(--c-copper);
  opacity: 0.9;
}

.page-about .hero-frame::before {
  top: -1px;
  left: -1px;
}

.page-about .hero-frame::after {
  bottom: -1px;
  right: -1px;
}

.page-about .about-eyebrow {
  margin: 0 0 clamp(12px, 2vw, 20px);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.24em;
  text-transform: uppercase;
  color: var(--c-copper);
}

.page-about .about-hero h1 {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(28px, 6vw, 58px);
  line-height: 1.1;
  letter-spacing: -0.015em;
  color: var(--c-snow);
}

.page-about .hero-lead {
  margin: clamp(14px, 2.4vw, 24px) 0 0;
  max-width: 58ch;
  font-size: clamp(15px, 1.6vw, 17px);
  line-height: 1.95;
  color: rgba(245, 247, 250, 0.82);
}

.page-about .hero-meta {
  list-style: none;
  margin: clamp(20px, 3vw, 32px) 0 0;
  padding: clamp(14px, 2vw, 18px) 0 0;
  border-top: 1px solid rgba(245, 247, 250, 0.16);
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 14px 18px;
}

.page-about .hero-meta li {
  display: flex;
  flex-direction: column;
  gap: 4px;
  min-width: 0;
}

.page-about .meta-k {
  font-size: 11px;
  letter-spacing: 0.14em;
  color: var(--c-mist);
}

.page-about .meta-v {
  font-family: var(--font-mono);
  font-size: clamp(16px, 2vw, 20px);
  letter-spacing: 0.02em;
  color: var(--c-snow);
}

.page-about .about-hero-figure {
  margin: clamp(20px, 3.4vw, 34px) 0 0;
  border: 1px solid rgba(245, 247, 250, 0.14);
}

.page-about .about-hero-figure img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 16 / 9;
  object-fit: cover;
  filter: saturate(0.85);
}

.page-about .about-hero-figure .media-caption {
  margin: 0;
  padding: 10px 14px;
  font-size: 12px;
  line-height: 1.7;
  color: var(--c-mist);
  background: rgba(15, 26, 46, 0.62);
  border-top: 1px solid rgba(245, 247, 250, 0.1);
}

/* ---------- 双栏骨架 ---------- */
.page-about .about-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(18px, 3vw, 30px);
  padding-block: clamp(28px, 4.5vw, 56px);
}

.page-about .section-nav {
  border-left: 1px solid var(--c-line);
  padding-left: 16px;
}

.page-about .nav-caption {
  margin: 0 0 10px;
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.24em;
  text-transform: uppercase;
  color: var(--c-text-soft);
}

.page-about .nav-caption:not(:first-child) {
  margin-top: 22px;
}

.page-about .section-nav ul {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.page-about .section-nav a {
  display: block;
  margin-left: -16px;
  padding: 7px 0 7px 14px;
  font-size: 14px;
  line-height: 1.5;
  color: var(--c-text-soft);
  text-decoration: none;
  border-left: 2px solid transparent;
  transition: color 0.2s var(--ease), border-color 0.2s var(--ease);
}

.page-about .section-nav a:hover {
  color: var(--c-indigo);
  border-left-color: rgba(200, 150, 62, 0.5);
}

.page-about .section-nav a[aria-current="true"],
.page-about .section-nav a[aria-current="page"] {
  color: var(--c-indigo);
  font-weight: 700;
  border-left-color: var(--c-copper);
}

.page-about .year-index {
  flex-direction: row;
  flex-wrap: wrap;
  gap: 6px;
}

.page-about .year-index a {
  margin-left: 0;
  padding: 4px 8px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.04em;
  border: 1px solid var(--c-line);
  border-left-width: 1px;
  color: var(--c-text-soft);
}

.page-about .year-index a:hover {
  color: var(--c-indigo);
  border-color: rgba(200, 150, 62, 0.65);
}

/* ---------- 章节与正文 ---------- */
.page-about .about-section {
  padding-block: clamp(24px, 4vw, 42px);
  border-top: 1px solid var(--c-line);
}

.page-about .about-section:first-child {
  padding-top: 0;
  border-top: 0;
}

.page-about .label {
  margin: 0 0 8px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--c-copper);
}

.page-about .section-title {
  margin: 0 0 clamp(12px, 2vw, 18px);
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(22px, 3.4vw, 32px);
  line-height: 1.28;
  letter-spacing: -0.01em;
  color: var(--c-indigo);
}

.page-about .prose {
  max-width: var(--about-prose);
}

.page-about .prose p {
  margin: 0 0 1.1em;
  font-size: clamp(15px, 1.55vw, 17px);
  line-height: 1.9;
  color: var(--c-text);
}

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

.page-about .prose a {
  color: var(--c-teal);
  text-decoration: none;
  border-bottom: 1px solid rgba(63, 110, 115, 0.4);
}

.page-about .prose a:hover {
  color: var(--c-indigo);
  border-bottom-color: var(--c-copper);
}

/* ---------- 时间带 ---------- */
.page-about .timeline-band {
  position: relative;
  margin-top: clamp(24px, 4vw, 40px);
  padding: clamp(18px, 3.2vw, 34px);
  background: linear-gradient(180deg, var(--c-indigo-deep) 0%, var(--c-ink) 100%);
  border: 1px solid rgba(200, 150, 62, 0.34);
  color: var(--c-snow);
}

.page-about .timeline-band::before {
  content: "";
  position: absolute;
  inset: 7px;
  border: 1px solid rgba(245, 247, 250, 0.07);
  pointer-events: none;
}

.page-about .timeline-band .label {
  color: var(--c-copper-lift);
}

.page-about .timeline-band .section-title {
  color: var(--c-snow);
}

.page-about .timeline-lead {
  margin: 0 0 clamp(16px, 2.6vw, 24px);
  max-width: 52ch;
  font-size: 14.5px;
  line-height: 1.85;
  color: rgba(245, 247, 250, 0.76);
}

.page-about .timeline-figure {
  margin: 0 0 clamp(16px, 2.6vw, 24px);
}

.page-about .timeline-figure img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 12 / 7;
  object-fit: cover;
  border: 1px solid rgba(245, 247, 250, 0.12);
}

.page-about .timeline-figure .media-caption {
  margin-top: 8px;
  font-size: 11.5px;
  line-height: 1.7;
  color: var(--c-mist);
}

.page-about .year-jump {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 0 0 clamp(14px, 2.4vw, 22px);
  padding: 0;
}

.page-about .year-jump a {
  display: inline-block;
  padding: 5px 10px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--c-mist);
  text-decoration: none;
  border: 1px solid rgba(245, 247, 250, 0.2);
  transition: color 0.2s var(--ease), background 0.2s var(--ease), border-color 0.2s var(--ease);
}

.page-about .year-jump a:hover {
  color: var(--c-ink);
  background: var(--c-copper);
  border-color: var(--c-copper);
}

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

.page-about .milestone {
  display: grid;
  grid-template-columns: 62px minmax(0, 1fr);
  gap: 10px 14px;
  padding-block: 14px;
  border-top: 1px dashed rgba(245, 247, 250, 0.18);
}

.page-about .milestone:first-child {
  border-top: 0;
  padding-top: 0;
}

.page-about .milestone-year {
  font-family: var(--font-mono);
  font-size: clamp(16px, 2vw, 19px);
  letter-spacing: 0.04em;
  color: var(--c-copper);
}

.page-about .milestone-body h3 {
  margin: 0 0 6px;
  font-size: 15px;
  font-weight: 700;
  letter-spacing: 0.01em;
  color: var(--c-snow);
}

.page-about .milestone-body p {
  margin: 0;
  font-size: 14px;
  line-height: 1.85;
  color: rgba(245, 247, 250, 0.72);
}

/* ---------- 服务原则 ---------- */
.page-about .principle-lead {
  margin: 0 0 clamp(16px, 2.6vw, 24px);
  max-width: 58ch;
  font-size: 15px;
  line-height: 1.85;
  color: var(--c-text-soft);
}

.page-about .principle-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(210px, 1fr));
  gap: 16px;
}

.page-about .principle-card {
  position: relative;
  padding: clamp(16px, 2.4vw, 24px);
  background: var(--c-paper);
  border: 1px solid rgba(27, 42, 74, 0.14);
  box-shadow: 6px 6px 0 rgba(27, 42, 74, 0.07);
  transition: transform 0.25s var(--ease), box-shadow 0.25s var(--ease);
}

.page-about .principle-card:hover {
  transform: translateY(-3px);
  box-shadow: 8px 10px 0 rgba(27, 42, 74, 0.09);
}

.page-about .principle-num {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.2em;
  color: var(--c-copper);
}

.page-about .principle-card h3 {
  margin: 10px 0 10px;
  font-family: var(--font-serif);
  font-weight: 600;
  font-size: 19px;
  line-height: 1.4;
  color: var(--c-indigo);
}

.page-about .principle-card p {
  margin: 0;
  font-size: 14px;
  line-height: 1.85;
  color: var(--c-text-soft);
}

.page-about .principle-card .principle-scene {
  margin-top: 12px;
  padding-top: 12px;
  border-top: 1px solid rgba(27, 42, 74, 0.14);
  color: var(--c-text);
}

.page-about .principle-scene strong {
  display: inline-block;
  margin-right: 6px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  color: var(--c-rust);
}

/* ---------- 支持团队 ---------- */
.page-about .team-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(18px, 3vw, 28px);
  align-items: start;
}

.page-about .team-figure {
  margin: 0;
}

.page-about .team-figure img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 3 / 2;
  object-fit: cover;
  border: 1px solid var(--c-line);
}

.page-about .team-figure .media-caption {
  margin-top: 8px;
  font-size: 12px;
  line-height: 1.7;
  color: var(--c-text-soft);
}

.page-about .team-facts {
  list-style: none;
  margin: clamp(14px, 2.4vw, 20px) 0 0;
  padding: 0;
  display: grid;
  gap: 10px;
}

.page-about .team-facts li {
  display: grid;
  grid-template-columns: 46px minmax(0, 1fr);
  gap: 12px;
  align-items: baseline;
  padding-bottom: 10px;
  border-bottom: 1px solid var(--c-line);
}

.page-about .fact-k {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--c-teal);
}

.page-about .fact-v {
  font-size: 14px;
  line-height: 1.75;
  color: var(--c-text);
}

/* ---------- 视觉叙事 ---------- */
.page-about .visual-panel {
  margin-top: clamp(16px, 2.8vw, 24px);
  padding: clamp(18px, 3.2vw, 34px);
  background: var(--c-paper);
  border: 1px solid rgba(27, 42, 74, 0.14);
}

.page-about .visual-quote {
  margin: 0;
  font-family: var(--font-serif);
  font-weight: 600;
  font-size: clamp(18px, 2.4vw, 23px);
  line-height: 1.75;
  color: var(--c-indigo);
}

.page-about .visual-quote::before {
  content: "";
  display: block;
  width: 44px;
  height: 2px;
  margin-bottom: 16px;
  background: var(--c-copper);
}

.page-about .visual-list {
  list-style: none;
  margin: clamp(16px, 2.4vw, 24px) 0 0;
  padding: 0;
  display: grid;
  gap: 14px;
}

.page-about .visual-list li {
  font-size: 14px;
  line-height: 1.8;
  color: var(--c-text-soft);
}

.page-about .visual-list strong {
  display: block;
  margin-bottom: 4px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.14em;
  font-weight: 500;
  color: var(--c-indigo);
}

/* ---------- 路径带 ---------- */
.page-about .next-paths {
  margin-top: clamp(24px, 4vw, 44px);
  padding-block: clamp(28px, 4.5vw, 54px);
  background:
    repeating-linear-gradient(0deg, rgba(245, 247, 250, 0.045) 0 1px, transparent 1px 64px),
    var(--c-indigo);
  color: var(--c-snow);
}

.page-about .next-paths .section-title {
  color: var(--c-snow);
  margin-bottom: 10px;
}

.page-about .next-paths-lead {
  margin: 0;
  max-width: 52ch;
  font-size: 14.5px;
  line-height: 1.85;
  color: rgba(245, 247, 250, 0.78);
}

.page-about .path-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1px;
  margin-top: clamp(16px, 2.8vw, 26px);
  background: rgba(245, 247, 250, 0.16);
  border: 1px solid rgba(245, 247, 250, 0.16);
}

.page-about .path-link {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: clamp(14px, 2.4vw, 22px);
  background: var(--c-indigo);
  color: var(--c-snow);
  text-decoration: none;
  transition: background 0.25s var(--ease);
}

.page-about .path-link:hover {
  background: var(--c-indigo-deep);
}

.page-about .path-k {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.18em;
  color: var(--c-copper);
}

.page-about .path-t {
  font-size: 16px;
  font-weight: 700;
  line-height: 1.4;
}

.page-about .path-d {
  font-size: 13px;
  line-height: 1.7;
  color: var(--c-mist);
}

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

  .page-about .milestone {
    grid-template-columns: 88px minmax(0, 1fr);
    gap: 10px 20px;
  }

  .page-about .visual-list {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 18px;
  }

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

@media (min-width: 860px) {
  .page-about .team-grid {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, 0.95fr);
  }
}

@media (min-width: 940px) {
  .page-about .about-layout {
    grid-template-columns: minmax(168px, 200px) minmax(0, 1fr);
    gap: clamp(36px, 5vw, 72px);
    align-items: start;
  }

  .page-about .about-aside {
    position: sticky;
    top: 24px;
  }

  .page-about .section-nav ul {
    flex-direction: column;
  }
}

@media (min-width: 1040px) {
  .page-about .path-grid {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .principle-card,
  .page-about .section-nav a,
  .page-about .path-link,
  .page-about .year-jump a,
  .page-about .breadcrumb a {
    transition: none;
  }

  .page-about .principle-card:hover {
    transform: none;
  }
}
<<<END>>>