.page-about {
  --about-gap: clamp(56px, 8vw, 112px);
  --about-teal: #0E3B3A;
  --about-indigo: #1B1640;
  background: var(--ink);
  color: var(--silver);
  overflow-x: hidden;
}

.page-about .shell {
  width: var(--shell-w);
  margin-inline: auto;
}

/* ---------- 面包屑 ---------- */
.page-about .breadcrumbs {
  padding-top: clamp(18px, 3vw, 32px);
}

.page-about .breadcrumbs ol {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 0;
  padding: 0;
  list-style: none;
  font-size: 13px;
  color: var(--mist);
}

.page-about .breadcrumbs li + li::before {
  content: "/";
  margin-right: 8px;
  color: var(--line);
}

.page-about .breadcrumbs a {
  color: var(--blue-text);
  text-decoration: none;
}

.page-about .breadcrumbs a:hover,
.page-about .breadcrumbs a:focus-visible {
  text-decoration: underline;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  padding: clamp(28px, 4vw, 56px) 0 var(--about-gap);
  background:
    radial-gradient(900px 520px at 88% -10%, rgba(139, 92, 246, .18), transparent 68%),
    radial-gradient(720px 460px at 8% 0%, rgba(47, 107, 255, .14), transparent 70%);
}

.page-about .about-hero-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(32px, 5vw, 64px);
  align-items: start;
}

.page-about .about-hero h1 {
  margin: 12px 0 0;
  font-family: var(--font-display);
  font-weight: 250;
  font-size: clamp(32px, 5vw, 62px);
  line-height: 1.12;
  letter-spacing: -0.02em;
  color: var(--silver);
  max-width: 16ch;
}

.page-about .about-hero .lead {
  margin: 20px 0 0;
  font-size: clamp(15px, 1.5vw, 17px);
  line-height: 1.8;
  color: var(--mist);
  max-width: 54ch;
}

.page-about .about-principles {
  margin: clamp(28px, 4vw, 40px) 0 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 1px;
  background: var(--line);
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}

.page-about .about-principles li {
  display: grid;
  grid-template-columns: 44px 1fr;
  gap: 16px;
  padding: 18px 0;
  background: var(--ink);
}

.page-about .about-principle-tag {
  font-size: 12px;
  letter-spacing: .12em;
  color: var(--amber);
  padding-top: 3px;
}

.page-about .about-principles strong {
  display: block;
  font-size: 15px;
  font-weight: 500;
  color: var(--silver);
}

.page-about .about-principles p {
  margin: 6px 0 0;
  font-size: 14px;
  line-height: 1.75;
  color: var(--mist);
}

.page-about .about-hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: clamp(26px, 4vw, 36px);
}

/* ---------- 首屏路径卡 ---------- */
.page-about .about-path-card {
  position: relative;
  border: 1px solid var(--line);
  border-radius: var(--radius-card);
  background: linear-gradient(180deg, var(--graphite) 0%, var(--graphite-deep) 100%);
  overflow: hidden;
}

.page-about .about-path-media {
  position: relative;
  aspect-ratio: 3 / 2;
  background: var(--ink);
  border-bottom: 1px solid var(--line);
}

.page-about .about-path-media img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: .88;
}

.page-about .about-path-media::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, rgba(11, 13, 16, 0) 30%, rgba(11, 13, 16, .78) 100%);
  pointer-events: none;
}

.page-about .about-path-body {
  padding: clamp(20px, 3vw, 28px);
}

.page-about .about-path-title {
  margin: 0 0 18px;
  font-size: 12px;
  letter-spacing: .14em;
  color: var(--blue-text);
}

.page-about .about-path {
  margin: 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 22px;
}

.page-about .about-path li {
  position: relative;
  display: grid;
  grid-template-columns: 14px 1fr;
  column-gap: 14px;
  row-gap: 4px;
}

.page-about .about-path li:not(:last-child)::before {
  content: "";
  position: absolute;
  left: 6px;
  top: 18px;
  bottom: -22px;
  width: 1px;
  background: linear-gradient(180deg, rgba(139, 92, 246, .7), rgba(47, 107, 255, .25));
}

.page-about .about-path-dot {
  grid-row: 1 / 3;
  width: 13px;
  height: 13px;
  margin-top: 4px;
  border-radius: var(--radius-pill);
  border: 1px solid var(--line);
  background: var(--ink);
  box-shadow: inset 0 0 0 3px var(--graphite);
}

.page-about .about-path li:nth-child(1) .about-path-dot { border-color: var(--blue); }
.page-about .about-path li:nth-child(2) .about-path-dot { border-color: var(--violet); }
.page-about .about-path li:nth-child(3) .about-path-dot { border-color: var(--amber); }

.page-about .about-path-label {
  font-size: 14px;
  font-weight: 500;
  color: var(--silver);
}

.page-about .about-path-hint {
  font-size: 13px;
  line-height: 1.65;
  color: var(--mist);
}

/* ---------- 站点定位 ---------- */
.page-about .about-origin {
  padding-bottom: var(--about-gap);
}

.page-about .about-origin-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(24px, 4vw, 56px);
  padding-top: clamp(28px, 4vw, 44px);
  border-top: 1px solid var(--line);
}

.page-about .about-origin h2 {
  margin: 10px 0 0;
  font-family: var(--font-display);
  font-weight: 250;
  font-size: clamp(24px, 3.2vw, 40px);
  line-height: 1.2;
  letter-spacing: -0.015em;
  color: var(--silver);
  max-width: 22ch;
}

.page-about .about-origin-body p {
  margin: 0 0 18px;
  font-size: 15px;
  line-height: 1.85;
  color: var(--mist);
  max-width: 62ch;
}

.page-about .about-facts {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 1px;
  margin: 28px 0 0;
  background: var(--line);
  border: 1px solid var(--line);
}

.page-about .about-facts > div {
  background: var(--graphite);
  padding: 16px 14px;
}

.page-about .about-facts dt {
  font-size: 11px;
  letter-spacing: .1em;
  color: var(--mist);
}

.page-about .about-facts dd {
  margin: 8px 0 0;
  font-size: clamp(16px, 1.8vw, 20px);
  font-weight: 500;
  color: var(--silver);
}

/* ---------- 组织方式章节带 ---------- */
.page-about .about-principle-band {
  padding: clamp(48px, 7vw, 88px) 0;
  background:
    linear-gradient(180deg, var(--about-teal) 0%, #0a2b2a 100%);
  border-top: 1px solid rgba(245, 246, 248, .08);
  border-bottom: 1px solid rgba(245, 246, 248, .08);
}

.page-about .about-band-head {
  max-width: 62ch;
}

.page-about .about-principle-band h2,
.page-about .about-audience h2,
.page-about .about-upkeep h2,
.page-about .about-timeline-head h2,
.page-about .about-scope h2 {
  margin: 10px 0 0;
  font-family: var(--font-display);
  font-weight: 250;
  font-size: clamp(24px, 3.2vw, 40px);
  line-height: 1.2;
  letter-spacing: -0.015em;
  color: var(--silver);
}

.page-about .about-principle-band .lead {
  margin: 14px 0 0;
  font-size: 15px;
  line-height: 1.8;
  color: rgba(245, 246, 248, .72);
}

.page-about .about-band-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1px;
  margin-top: clamp(28px, 4vw, 44px);
  background: rgba(245, 246, 248, .14);
  border: 1px solid rgba(245, 246, 248, .14);
}

.page-about .about-band-card {
  background: rgba(11, 13, 16, .34);
  padding: clamp(20px, 3vw, 28px);
  transition: background var(--dur) var(--ease), transform var(--dur) var(--ease);
}

.page-about .about-band-card:hover {
  background: rgba(11, 13, 16, .58);
  transform: translateY(-2px);
}

.page-about .about-band-card h3 {
  margin: 0 0 10px;
  font-size: 16px;
  font-weight: 500;
  color: var(--silver);
}

.page-about .about-band-card p {
  margin: 0 0 14px;
  font-size: 14px;
  line-height: 1.8;
  color: rgba(245, 246, 248, .76);
}

.page-about .about-band-meta {
  margin: 0;
  font-size: 11px;
  letter-spacing: .08em;
  color: var(--amber);
}

/* ---------- 服务对象 ---------- */
.page-about .about-audience {
  padding: var(--about-gap) 0;
}

.page-about .about-audience-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1px;
  margin-top: clamp(26px, 4vw, 44px);
  background: var(--line);
  border: 1px solid var(--line);
}

.page-about .about-audience-item {
  background: var(--ink);
  padding: clamp(20px, 3vw, 28px);
  display: flex;
  flex-direction: column;
  gap: 10px;
  transition: background var(--dur) var(--ease);
}

.page-about .about-audience-item:hover,
.page-about .about-audience-item:focus-within {
  background: var(--graphite);
}

.page-about .about-audience-item h3 {
  margin: 0;
  font-size: 16px;
  font-weight: 500;
  color: var(--silver);
}

.page-about .about-audience-item p {
  margin: 0;
  font-size: 14px;
  line-height: 1.8;
  color: var(--mist);
  flex: 1;
}

.page-about .about-audience-item .tag {
  align-self: flex-start;
}

.page-about .about-link {
  align-self: flex-start;
  font-size: 13px;
  color: var(--blue-text);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: border-color var(--dur-fast) var(--ease), color var(--dur-fast) var(--ease);
}

.page-about .about-link:hover,
.page-about .about-link:focus-visible {
  color: var(--silver);
  border-bottom-color: var(--blue);
}

/* ---------- 维护节奏 ---------- */
.page-about .about-upkeep {
  padding: clamp(48px, 7vw, 88px) 0;
  background: linear-gradient(180deg, var(--indigo) 0%, #12102e 100%);
  border-top: 1px solid rgba(245, 246, 248, .08);
  border-bottom: 1px solid rgba(245, 246, 248, .08);
}

.page-about .about-upkeep-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(28px, 4vw, 56px);
  align-items: start;
}

.page-about .about-upkeep-figure {
  margin: 0;
  border: 1px solid rgba(245, 246, 248, .16);
  border-radius: var(--radius-card);
  overflow: hidden;
  background: var(--graphite-deep);
}

.page-about .about-upkeep-figure img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
  opacity: .92;
}

.page-about .about-upkeep-figure figcaption {
  padding: 12px 16px;
  font-size: 11px;
  letter-spacing: .06em;
  color: var(--mist);
  border-top: 1px solid rgba(245, 246, 248, .12);
}

.page-about .about-upkeep-body > p:first-of-type {
  margin: 14px 0 0;
  font-size: 15px;
  line-height: 1.85;
  color: rgba(245, 246, 248, .78);
  max-width: 56ch;
}

.page-about .about-upkeep-list {
  margin: clamp(24px, 3vw, 32px) 0 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 1px;
  background: rgba(245, 246, 248, .14);
  border-top: 1px solid rgba(245, 246, 248, .14);
  border-bottom: 1px solid rgba(245, 246, 248, .14);
}

.page-about .about-upkeep-list li {
  display: grid;
  grid-template-columns: 64px 1fr;
  gap: 16px;
  align-items: start;
  padding: 14px 0;
  background: transparent;
}

.page-about .about-upkeep-list .mono {
  font-size: 12px;
  letter-spacing: .1em;
  color: var(--amber);
}

.page-about .about-upkeep-list p {
  margin: 0;
  font-size: 14px;
  line-height: 1.75;
  color: rgba(245, 246, 248, .76);
}

.page-about .about-upkeep-note {
  margin: 22px 0 0;
  font-size: 13px;
  line-height: 1.8;
  color: var(--mist);
}

.page-about .about-upkeep-note a {
  color: var(--blue-text);
  text-decoration: none;
  border-bottom: 1px solid rgba(138, 180, 255, .4);
}

.page-about .about-upkeep-note a:hover,
.page-about .about-upkeep-note a:focus-visible {
  color: var(--silver);
  border-bottom-color: var(--silver);
}

/* ---------- 发展历程 ---------- */
.page-about .about-timeline-section {
  padding: var(--about-gap) 0;
}

.page-about .about-timeline-figure {
  margin: 0 0 clamp(24px, 4vw, 40px);
  border: 1px solid var(--line);
  border-radius: var(--radius-card);
  overflow: hidden;
  background: var(--graphite-deep);
}

.page-about .about-timeline-figure img {
  display: block;
  width: 100%;
  height: auto;
  max-height: 260px;
  object-fit: cover;
  opacity: .85;
}

.page-about .about-timeline-head {
  max-width: 60ch;
}

.page-about .about-timeline {
  margin: clamp(26px, 4vw, 44px) 0 0;
  padding: 0;
  list-style: none;
  display: grid;
  grid-template-columns: 1fr;
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
}

.page-about .about-stage {
  position: relative;
  background: var(--ink);
  padding: clamp(20px, 3vw, 26px);
  transition: background var(--dur) var(--ease);
}

.page-about .about-stage::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  width: 100%;
  height: 2px;
  background: var(--grad-line);
  opacity: 0;
  transition: opacity var(--dur) var(--ease);
}

.page-about .about-stage:hover,
.page-about .about-stage:focus-within {
  background: var(--graphite);
}

.page-about .about-stage:hover::before,
.page-about .about-stage:focus-within::before {
  opacity: 1;
}

.page-about .about-stage-num {
  display: inline-block;
  font-size: 12px;
  letter-spacing: .12em;
  color: var(--blue-text);
  padding-bottom: 10px;
  border-bottom: 1px solid var(--line);
  margin-bottom: 12px;
}

.page-about .about-stage h3 {
  margin: 0 0 8px;
  font-size: 15px;
  font-weight: 500;
  color: var(--silver);
}

.page-about .about-stage p {
  margin: 0;
  font-size: 14px;
  line-height: 1.78;
  color: var(--mist);
}

/* ---------- 服务范围 ---------- */
.page-about .about-scope {
  padding: 0 0 var(--about-gap);
}

.page-about .about-scope-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1px;
  margin-top: clamp(26px, 4vw, 40px);
  background: var(--line);
  border: 1px solid var(--line);
}

.page-about .about-scope-col {
  background: var(--graphite);
  padding: clamp(22px, 3vw, 30px);
}

.page-about .about-scope-col h3 {
  margin: 0;
  font-size: 15px;
  font-weight: 500;
  letter-spacing: .02em;
  color: var(--silver);
}

.page-about .about-scope-num {
  margin: 12px 0 14px;
  font-family: var(--font-mono);
  font-size: clamp(28px, 4vw, 44px);
  font-weight: 300;
  line-height: 1;
  letter-spacing: -0.02em;
  background: var(--grad-brand);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.page-about .about-scope-col > p:not(.about-scope-num) {
  margin: 0 0 16px;
  font-size: 14px;
  line-height: 1.8;
  color: var(--mist);
}

.page-about .about-scope-list {
  margin: 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 9px;
  border-top: 1px solid var(--line);
  padding-top: 14px;
}

.page-about .about-scope-list li {
  position: relative;
  padding-left: 16px;
  font-size: 13px;
  line-height: 1.7;
  color: var(--mist);
}

.page-about .about-scope-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 8px;
  width: 6px;
  height: 6px;
  border-radius: var(--radius-pill);
  background: var(--blue);
  box-shadow: var(--glow-blue);
}

.page-about .about-scope-cta {
  display: flex;
  flex-direction: column;
  gap: 18px;
  margin-top: clamp(26px, 4vw, 38px);
  padding-top: clamp(22px, 3vw, 30px);
  border-top: 1px solid var(--line);
}

.page-about .about-scope-cta p {
  margin: 0;
  font-size: 15px;
  line-height: 1.8;
  color: var(--mist);
  max-width: 56ch;
}

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

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

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

  .page-about .about-scope-cta {
    flex-direction: row;
    align-items: center;
    justify-content: space-between;
  }
}

@media (min-width: 900px) {
  .page-about .about-hero-grid {
    grid-template-columns: minmax(0, 1.06fr) minmax(0, .94fr);
    gap: clamp(40px, 5vw, 80px);
  }

  .page-about .about-origin-grid {
    grid-template-columns: minmax(0, .82fr) minmax(0, 1.18fr);
    gap: clamp(32px, 5vw, 72px);
  }

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

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

  .page-about .about-upkeep-grid {
    grid-template-columns: minmax(0, .9fr) minmax(0, 1.1fr);
    gap: clamp(36px, 5vw, 64px);
  }

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

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

@media (prefers-reduced-motion: reduce) {
  .page-about .about-band-card,
  .page-about .about-audience-item,
  .page-about .about-stage,
  .page-about .about-link {
    transition: none;
  }

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