.page-about {
  --about-rail: 176px;
  --about-pad: clamp(30px, 4.6vw, 60px);
  display: block;
}

/* ============ 首屏 ============ */
.page-about .about-hero {
  position: relative;
  overflow: hidden;
  padding: clamp(24px, 4vw, 56px) 0 clamp(32px, 5vw, 72px);
  border-bottom: 1px solid var(--c-line);
  background:
    radial-gradient(120% 92% at 88% 4%, rgba(139, 92, 246, 0.22), transparent 58%),
    radial-gradient(80% 72% at 4% 98%, rgba(34, 211, 238, 0.10), transparent 62%),
    var(--c-void);
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(var(--line-soft) 1px, transparent 1px),
    linear-gradient(90deg, var(--line-soft) 1px, transparent 1px);
  background-size: 56px 56px;
  -webkit-mask-image: radial-gradient(115% 85% at 80% 20%, #000 0%, transparent 70%);
  mask-image: radial-gradient(115% 85% at 80% 20%, #000 0%, transparent 70%);
  pointer-events: none;
}

.page-about .about-hero-grid {
  position: relative;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(26px, 4vw, 48px);
  align-items: center;
}

.page-about .about-hero-copy .breadcrumbs {
  margin: 0 0 clamp(16px, 2.4vw, 24px);
  font-family: var(--font-mono);
  font-size: var(--fs-micro);
  letter-spacing: 0.04em;
}

.page-about .about-hero-copy .breadcrumbs a {
  color: var(--c-muted);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color var(--t-fast), border-color var(--t-fast);
}

.page-about .about-hero-copy .breadcrumbs a:hover,
.page-about .about-hero-copy .breadcrumbs a:focus-visible {
  color: var(--c-cyan);
  border-bottom-color: var(--c-cyan);
}

.page-about .about-hero-copy .eyebrow {
  margin: 0 0 12px;
  font-family: var(--font-mono);
  font-size: var(--fs-micro);
  letter-spacing: 0.16em;
  color: var(--c-cyan);
}

.page-about .about-hero-copy .display-1 {
  margin: 0 0 clamp(14px, 2vw, 22px);
  letter-spacing: -0.01em;
}

.page-about .about-hero-copy .display-1::after {
  content: "";
  display: block;
  width: 68px;
  height: 3px;
  margin-top: 22px;
  background: linear-gradient(90deg, var(--c-purple), var(--c-orange));
}

.page-about .about-hero-copy .lede {
  margin: 0;
  max-width: 58ch;
  color: var(--c-muted);
  line-height: 1.85;
}

.page-about .about-hero-facts {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  margin: clamp(20px, 3vw, 30px) 0;
  border: 1px solid var(--c-line);
  background: rgba(18, 18, 26, 0.6);
}

.page-about .about-fact {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: clamp(12px, 1.8vw, 18px) clamp(10px, 1.6vw, 18px);
  border-right: 1px solid var(--c-line);
}

.page-about .about-fact:last-child {
  border-right: 0;
}

.page-about .about-fact-num {
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: clamp(1.4rem, 2.6vw, 2rem);
  line-height: 1;
  color: var(--c-purple);
}

.page-about .about-fact:nth-child(2) .about-fact-num {
  color: var(--c-cyan);
}

.page-about .about-fact:nth-child(3) .about-fact-num {
  color: var(--c-orange);
}

.page-about .about-fact-label {
  font-size: var(--fs-micro);
  letter-spacing: 0.04em;
  color: var(--c-muted);
}

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

.page-about .about-hero-visual {
  position: relative;
  margin: 0;
  overflow: hidden;
  border: 1px solid var(--c-line);
  background: var(--c-panel);
}

.page-about .about-hero-visual::before {
  content: "";
  position: absolute;
  inset: 0;
  z-index: 2;
  background: linear-gradient(118deg, transparent 40%, rgba(139, 92, 246, 0.34) 49%, transparent 58%);
  pointer-events: none;
}

.page-about .about-hero-visual img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 2 / 1;
  object-fit: cover;
}

.page-about .about-hero-visual .media-caption {
  position: relative;
  z-index: 3;
  display: block;
  padding: 12px 14px;
  border-top: 1px solid var(--c-line);
  background: var(--c-panel);
  font-size: var(--fs-micro);
  line-height: 1.65;
  color: var(--c-muted);
}

/* ============ 布局与章节索引 ============ */
.page-about .about-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  padding-top: clamp(28px, 4vw, 56px);
}

.page-about .about-toc {
  position: sticky;
  top: var(--header-h);
  z-index: 8;
  margin: 0 0 clamp(18px, 3vw, 28px);
  padding: 10px 0;
  overflow-x: auto;
  overscroll-behavior-x: contain;
  scrollbar-width: none;
  border-bottom: 1px solid var(--c-line);
  background: rgba(7, 7, 11, 0.94);
  -webkit-backdrop-filter: blur(10px);
  backdrop-filter: blur(10px);
}

.page-about .about-toc::-webkit-scrollbar {
  display: none;
}

.page-about .about-toc-title {
  display: none;
  margin: 0;
  font-family: var(--font-mono);
  font-size: var(--fs-micro);
  letter-spacing: 0.16em;
  color: var(--c-muted);
}

.page-about .about-toc-list {
  display: flex;
  gap: 6px;
  margin: 0;
  padding: 0;
  list-style: none;
  white-space: nowrap;
}

.page-about .about-toc-list a {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 7px 12px;
  border: 1px solid var(--c-line);
  color: var(--c-muted);
  font-size: var(--fs-micro);
  text-decoration: none;
  transition: color var(--t-fast), border-color var(--t-fast), background var(--t-fast);
}

.page-about .about-toc-list a:hover,
.page-about .about-toc-list a:focus-visible {
  color: var(--c-text);
  border-color: var(--c-purple);
  background: rgba(139, 92, 246, 0.1);
}

.page-about .about-toc-num {
  font-family: var(--font-mono);
  color: var(--c-purple);
}

/* ============ 章节骨架 ============ */
.page-about .about-band {
  padding: var(--about-pad) 0;
}

.page-about .about-band + .about-band,
.page-about .about-band + .about-cta {
  border-top: 1px solid var(--c-line);
}

.page-about .about-band-head {
  display: flex;
  align-items: flex-start;
  gap: clamp(12px, 1.8vw, 20px);
  margin-bottom: clamp(18px, 2.6vw, 30px);
}

.page-about .about-band-num {
  flex: none;
  margin-top: 4px;
  padding: 5px 8px;
  border: 1px solid var(--c-purple);
  color: var(--c-purple);
  font-size: var(--fs-micro);
  line-height: 1;
  letter-spacing: 0.1em;
}

.page-about .about-band-head .section-title {
  margin: 0;
  max-width: 30ch;
}

.page-about .about-band--narrow .about-intro,
.page-about .about-band--narrow .about-paths,
.page-about .about-band--narrow .version-rail,
.page-about .about-band--narrow .about-media,
.page-about .about-band--narrow .cred-list {
  max-width: 780px;
}

.page-about .about-prose {
  display: grid;
  gap: clamp(14px, 2vw, 20px);
  max-width: 74ch;
}

.page-about .about-prose p {
  margin: 0;
  font-size: var(--fs-body);
  line-height: 1.85;
  color: var(--c-text);
}

.page-about .about-intro {
  margin: 0 0 clamp(18px, 2.4vw, 26px);
  max-width: 72ch;
  font-size: var(--fs-body);
  line-height: 1.82;
  color: var(--c-muted);
}

/* ============ 01 品牌定位 ============ */
.page-about .about-claims {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1px;
  margin-top: clamp(22px, 3vw, 36px);
  border: 1px solid var(--c-line);
  background: var(--c-line);
}

.page-about .about-claim {
  padding: clamp(16px, 2.2vw, 24px);
  background: var(--c-panel);
}

.page-about .about-claim-key {
  display: inline-block;
  margin-bottom: 10px;
  padding: 3px 7px;
  border: 1px solid var(--c-cyan);
  color: var(--c-cyan);
  font-size: var(--fs-micro);
  line-height: 1.4;
  letter-spacing: 0.1em;
}

.page-about .about-claim p {
  margin: 0;
  font-size: var(--fs-small);
  line-height: 1.72;
  color: var(--c-muted);
}

/* ============ 02 内容归位 ============ */
.page-about .about-paths {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1px;
  margin: 0;
  padding: 0;
  list-style: none;
  border: 1px solid var(--c-line);
  background: var(--c-line);
}

.page-about .about-path {
  position: relative;
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 14px;
  padding: clamp(16px, 2.2vw, 24px);
  background: var(--c-panel);
  transition: background var(--t-fast);
}

.page-about .about-path::after {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 2px;
  background: transparent;
  transition: background var(--t-fast);
}

.page-about .about-path:hover {
  background: var(--c-panel-2);
}

.page-about .about-path:hover::after {
  background: var(--c-purple);
}

.page-about .about-path-num {
  font-family: var(--font-mono);
  font-size: 1.05rem;
  line-height: 1.45;
  color: var(--c-orange);
}

.page-about .about-path-body .card-title {
  margin: 0 0 8px;
}

.page-about .about-path-body .card-text {
  margin: 0 0 12px;
  font-size: var(--fs-small);
  line-height: 1.72;
  color: var(--c-muted);
}

.page-about .about-path-link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-family: var(--font-mono);
  font-size: var(--fs-micro);
  color: var(--c-cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(34, 211, 238, 0.4);
  transition: color var(--t-fast), border-color var(--t-fast);
}

.page-about .about-path-link:hover,
.page-about .about-path-link:focus-visible {
  color: var(--c-text);
  border-bottom-color: var(--c-text);
}

/* ============ 图注容器 ============ */
.page-about .about-media {
  position: relative;
  margin: 0 0 clamp(22px, 3vw, 32px);
  overflow: hidden;
  border: 1px solid var(--c-line);
  background: var(--c-panel);
}

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

.page-about .about-media .media-caption {
  display: block;
  padding: 10px 14px;
  border-top: 1px solid var(--c-line);
  font-size: var(--fs-micro);
  line-height: 1.65;
  color: var(--c-muted);
}

.page-about .about-media--side {
  margin: 0;
}

/* ============ 03 版本时间轴 ============ */
.page-about .version-rail {
  position: relative;
  margin: 0;
  padding: 0 0 0 26px;
  list-style: none;
  border-left: 1px solid var(--c-line);
}

.page-about .version-node {
  position: relative;
  display: grid;
  grid-template-columns: 52px minmax(0, 1fr);
  gap: 14px;
  align-items: start;
  padding: clamp(14px, 2vw, 20px) 0;
  border-bottom: 1px solid var(--line-soft);
  transition: background var(--t-fast);
}

.page-about .version-node:last-child {
  border-bottom: 0;
}

.page-about .version-node::before {
  content: "";
  position: absolute;
  left: -31px;
  top: calc(clamp(14px, 2vw, 20px) + 6px);
  width: 9px;
  height: 9px;
  border: 1px solid var(--c-purple);
  background: var(--c-void);
  transition: background var(--t-fast), box-shadow var(--t-fast);
}

.page-about .version-node:hover::before,
.page-about .version-node:focus-within::before {
  background: var(--c-purple);
  box-shadow: 0 0 14px var(--purple-glow);
}

.page-about .version-tag {
  justify-self: start;
  padding: 4px 9px;
  border: 1px solid var(--c-cyan);
  color: var(--c-cyan);
  font-size: var(--fs-micro);
  line-height: 1;
  letter-spacing: 0.12em;
}

.page-about .version-node:last-child .version-tag {
  border-color: var(--c-orange);
  color: var(--c-orange);
}

.page-about .version-body h3 {
  margin: 0 0 6px;
  font-size: var(--fs-h3);
  font-weight: 700;
  color: var(--c-text);
}

.page-about .version-body p {
  margin: 0;
  font-size: var(--fs-small);
  line-height: 1.72;
  color: var(--c-muted);
}

/* ============ 04 服务覆盖 ============ */
.page-about .coverage-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin-top: clamp(20px, 3vw, 32px);
  border: 1px solid var(--c-line);
  background: var(--c-line);
}

.page-about .coverage-cell {
  display: flex;
  flex-direction: column;
  gap: 10px;
  padding: clamp(18px, 2.6vw, 28px) clamp(14px, 2vw, 22px);
  background: var(--c-panel);
}

.page-about .coverage-value {
  display: flex;
  align-items: baseline;
  flex-wrap: wrap;
  gap: 6px;
  margin: 0;
}

.page-about .coverage-num {
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: clamp(1.7rem, 3.2vw, 2.6rem);
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--c-purple);
}

.page-about .coverage-cell:nth-child(2) .coverage-num {
  color: var(--c-cyan);
}

.page-about .coverage-cell:nth-child(3) .coverage-num {
  color: var(--c-orange);
}

.page-about .coverage-cell:nth-child(4) .coverage-num {
  color: var(--c-green);
}

.page-about .coverage-unit {
  font-size: var(--fs-small);
  font-weight: 500;
  color: var(--c-text);
}

.page-about .coverage-label {
  margin: 0;
  font-size: var(--fs-micro);
  line-height: 1.65;
  color: var(--c-muted);
}

/* ============ 05 团队与运营 ============ */
.page-about .team-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(24px, 3.4vw, 44px);
  align-items: start;
}

.page-about .team-copy p {
  margin: 0 0 clamp(14px, 2vw, 20px);
  max-width: 62ch;
  font-size: var(--fs-body);
  line-height: 1.82;
  color: var(--c-text);
}

.page-about .team-bars {
  display: grid;
  gap: 14px;
  margin-top: clamp(20px, 2.6vw, 28px);
  max-width: 520px;
}

.page-about .team-bar {
  display: grid;
  grid-template-columns: 92px minmax(0, 1fr) 40px;
  align-items: center;
  gap: 12px;
}

.page-about .team-bar-label {
  font-size: var(--fs-micro);
  color: var(--c-muted);
}

.page-about .team-bar-track {
  display: block;
  height: 8px;
  overflow: hidden;
  background: var(--c-panel-2);
}

.page-about .team-bar-fill {
  display: block;
  height: 100%;
  width: var(--bar, 0%);
  background: linear-gradient(90deg, var(--c-purple), var(--c-cyan));
}

.page-about .team-bar:nth-child(2) .team-bar-fill {
  background: linear-gradient(90deg, var(--c-cyan), var(--c-green));
}

.page-about .team-bar:nth-child(3) .team-bar-fill {
  background: linear-gradient(90deg, var(--c-orange), var(--c-purple));
}

.page-about .team-bar-val {
  font-family: var(--font-mono);
  font-size: var(--fs-small);
  text-align: right;
  color: var(--c-text);
}

/* ============ 06 资质与备案 ============ */
.page-about .cred-list {
  display: grid;
  gap: 0;
  border-top: 1px solid var(--c-line);
}

.page-about .cred-item {
  display: grid;
  grid-template-columns: 74px minmax(0, 1fr);
  gap: 16px;
  align-items: start;
  padding: clamp(14px, 2vw, 20px) 0;
  border-bottom: 1px solid var(--line-soft);
}

.page-about .cred-key {
  padding-top: 3px;
  font-family: var(--font-mono);
  font-size: var(--fs-micro);
  letter-spacing: 0.1em;
  color: var(--c-orange);
}

.page-about .cred-item p {
  margin: 0;
  font-size: var(--fs-small);
  line-height: 1.78;
  color: var(--c-muted);
}

/* ============ 收尾入口 ============ */
.page-about .about-cta {
  padding: clamp(30px, 4.6vw, 60px) 0 0;
}

.page-about .about-cta .section-title {
  margin: 0 0 clamp(16px, 2.2vw, 24px);
  max-width: 30ch;
}

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

/* ============ 响应式 ============ */
@media (min-width: 700px) {
  .page-about .about-paths {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (min-width: 760px) {
  .page-about .about-claims {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

@media (min-width: 900px) {
  .page-about .coverage-grid {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .page-about .team-grid {
    grid-template-columns: minmax(0, 1.1fr) minmax(0, 0.9fr);
  }
}

@media (min-width: 960px) {
  .page-about .about-hero-grid {
    grid-template-columns: minmax(0, 1.02fr) minmax(0, 0.98fr);
  }
}

@media (min-width: 1100px) {
  .page-about .about-layout {
    grid-template-columns: var(--about-rail) minmax(0, 1fr);
    column-gap: clamp(32px, 4.4vw, 64px);
  }

  .page-about .about-toc {
    align-self: start;
    top: calc(var(--header-h) + 24px);
    margin: 0;
    padding: 0 0 8px 18px;
    overflow: visible;
    border-bottom: 0;
    border-left: 1px solid var(--c-line);
    background: transparent;
    -webkit-backdrop-filter: none;
    backdrop-filter: none;
  }

  .page-about .about-toc-title {
    display: block;
    margin-bottom: 14px;
  }

  .page-about .about-toc-list {
    flex-direction: column;
    gap: 0;
    white-space: normal;
  }

  .page-about .about-toc-list a {
    padding: 11px 0;
    border: 0;
    border-bottom: 1px solid var(--line-soft);
  }

  .page-about .about-toc-list a:hover,
  .page-about .about-toc-list a:focus-visible {
    background: transparent;
    color: var(--c-text);
  }
}

@media (max-width: 560px) {
  .page-about .about-hero-facts {
    grid-template-columns: minmax(0, 1fr);
  }

  .page-about .about-fact {
    flex-direction: row;
    align-items: baseline;
    justify-content: space-between;
    border-right: 0;
    border-bottom: 1px solid var(--c-line);
  }

  .page-about .about-fact:last-child {
    border-bottom: 0;
  }

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

  .page-about .team-bar {
    grid-template-columns: 76px minmax(0, 1fr) 34px;
    gap: 8px;
  }

  .page-about .cred-item {
    grid-template-columns: minmax(0, 1fr);
    gap: 6px;
  }

  .page-about .version-node {
    grid-template-columns: minmax(0, 1fr);
    gap: 8px;
  }
}
<<<END>>>

.page-about {
  --bar: 1rem;
}