.page-about {
  background: var(--night);
  color: var(--chalk);
  overflow-x: clip;
}

.page-about .breadcrumb__list {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  list-style: none;
  margin: 0;
  padding: 0;
  font-size: 12px;
  letter-spacing: 0.12em;
}

.page-about .breadcrumb__link {
  color: var(--mist);
  text-decoration: none;
}

.page-about .breadcrumb__link:hover,
.page-about .breadcrumb__link:focus-visible {
  color: var(--cyan);
}

.page-about .breadcrumb__sep {
  color: var(--moss);
}

.page-about .breadcrumb__item span[aria-current="page"] {
  color: var(--chalk);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  padding: clamp(18px, 3vw, 30px) 0 clamp(44px, 7vw, 84px);
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image: radial-gradient(circle, rgba(51, 230, 192, 0.11) 1px, transparent 1px);
  background-size: 16px 16px;
  -webkit-mask-image: linear-gradient(to bottom, #000 0%, transparent 78%);
  mask-image: linear-gradient(to bottom, #000 0%, transparent 78%);
  pointer-events: none;
}

.page-about .hero-grid {
  position: relative;
  display: grid;
  gap: clamp(26px, 5vw, 56px);
  margin-top: clamp(28px, 5vw, 52px);
}

.page-about .hero-eyebrow {
  color: var(--cyan);
  margin: 0 0 clamp(14px, 2vw, 22px);
}

.page-about .hero-title {
  font-family: var(--font-display);
  color: var(--chalk);
  margin: 0;
}

.page-about .hero-lead {
  max-width: 30em;
  margin: clamp(20px, 3vw, 30px) 0 0;
  font-size: 16px;
  line-height: 1.75;
  color: var(--chalk);
}

.page-about .hero-figure {
  margin: 0;
  position: relative;
}

.page-about .hero-figure img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 2 / 1;
  object-fit: cover;
  clip-path: polygon(0 0, calc(100% - 22px) 0, 100% 22px, 100% 100%, 0 100%);
  background: var(--night-2);
}

.page-about .hero-cap {
  display: block;
  margin: 10px 0 0;
  color: var(--mist);
}

/* ---------- 索引 + 正文 ---------- */
.page-about .about-body {
  display: grid;
  gap: clamp(26px, 4vw, 40px);
  padding-top: clamp(26px, 4vw, 40px);
  border-top: 1px solid var(--moss);
}

.page-about .index-title {
  margin: 0;
  color: var(--mist);
}

.page-about .index-list {
  list-style: none;
  display: flex;
  gap: 18px;
  margin: 12px 0 0;
  padding: 0 0 6px;
  overflow-x: auto;
  scrollbar-width: none;
}

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

.page-about .index-link {
  display: flex;
  align-items: baseline;
  gap: 8px;
  white-space: nowrap;
  padding: 6px 0;
  font-size: 14px;
  color: var(--mist);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color 160ms var(--ease), border-color 160ms var(--ease);
}

.page-about .index-link .mono {
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--slate);
}

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

/* ---------- 章节 ---------- */
.page-about .chapter {
  padding: clamp(26px, 4.5vw, 44px) 0;
  border-top: 1px solid var(--moss);
}

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

.page-about .chapter::after {
  content: "";
  display: block;
  width: min(100%, 360px);
  height: 1px;
  margin-top: clamp(26px, 4vw, 46px);
  background: linear-gradient(90deg, var(--moss), rgba(30, 58, 46, 0));
  transform: rotate(-6deg);
  transform-origin: left center;
}

.page-about .chapter:last-child::after {
  display: none;
}

.page-about .chapter-head {
  margin-bottom: clamp(18px, 3vw, 26px);
}

.page-about .chapter-no {
  margin: 0 0 12px;
  font-size: 12px;
  letter-spacing: 0.18em;
  color: var(--cyan);
}

.page-about .chapter-title {
  font-family: var(--font-display);
  font-weight: 600;
  font-size: clamp(32px, 4vw, 48px);
  line-height: 1.04;
  letter-spacing: -0.015em;
  color: var(--chalk);
  margin: 0;
}

.page-about .prose {
  max-width: 34em;
}

.page-about .prose p {
  margin: 0 0 1.2em;
  font-size: 16px;
  line-height: 1.75;
  color: var(--chalk);
}

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

.page-about .pull {
  max-width: 34em;
  margin: clamp(22px, 3.5vw, 32px) 0 0;
  padding-left: 18px;
  border-left: 3px solid var(--cyan);
  font-family: var(--font-display);
  font-size: 24px;
  line-height: 1.35;
  color: var(--chalk);
}

/* ---------- 产品线 ---------- */
.page-about .line-list {
  list-style: none;
  margin: clamp(22px, 3.5vw, 32px) 0 0;
  padding: 0;
  display: grid;
  gap: clamp(18px, 3vw, 28px);
}

.page-about .line-item {
  display: grid;
  gap: 8px;
  padding-top: 18px;
  border-top: 1px solid var(--moss);
}

.page-about .line-no {
  margin: 0;
  font-size: 12px;
  letter-spacing: 0.18em;
  color: var(--cyan);
}

.page-about .line-title {
  margin: 0 0 8px;
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 24px;
  line-height: 1.2;
  color: var(--chalk);
}

.page-about .line-text {
  margin: 0;
  max-width: 34em;
  font-size: 16px;
  line-height: 1.75;
  color: var(--chalk);
}

.page-about .line-meta {
  margin: 12px 0 0;
  color: var(--mist);
}

/* ---------- 历程 ---------- */
.page-about .timeline-figure {
  margin: clamp(22px, 3.5vw, 32px) 0 0;
}

.page-about .timeline-figure img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 2 / 1;
  object-fit: cover;
  background: var(--night-2);
  clip-path: polygon(0 0, calc(100% - 20px) 0, 100% 20px, 100% 100%, 0 100%);
}

.page-about .timeline-figure figcaption {
  display: block;
  margin-top: 10px;
  color: var(--mist);
}

.page-about .steps {
  list-style: none;
  margin: clamp(26px, 4vw, 38px) 0 0;
  padding: 0;
  display: grid;
  gap: clamp(18px, 3vw, 26px);
}

.page-about .step {
  padding: 4px 0 4px 18px;
  border-left: 1px solid var(--moss);
}

.page-about .step-no {
  margin: 0 0 6px;
  font-size: 12px;
  letter-spacing: 0.16em;
  color: var(--amber);
}

.page-about .step-title {
  margin: 0 0 8px;
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 24px;
  line-height: 1.2;
  color: var(--chalk);
}

.page-about .step-text {
  margin: 0;
  max-width: 34em;
  font-size: 16px;
  line-height: 1.75;
  color: var(--mist);
}

/* ---------- 团队 ---------- */
.page-about .team-grid {
  display: grid;
  gap: clamp(22px, 3.5vw, 40px);
}

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

.page-about .team-figure img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 5 / 4;
  object-fit: cover;
  background: var(--night-2);
  clip-path: polygon(0 0, calc(100% - 20px) 0, 100% 20px, 100% 100%, 0 100%);
}

.page-about .team-figure figcaption {
  display: block;
  margin-top: 10px;
  color: var(--mist);
}

/* ---------- 服务与合作 ---------- */
.page-about .reach-facts {
  list-style: none;
  margin: clamp(24px, 3.5vw, 34px) 0 0;
  padding: 0;
  display: grid;
  gap: 14px;
}

.page-about .reach-facts li {
  padding-left: 13px;
  border-left: 2px solid var(--cyan);
  font-size: 14px;
  line-height: 1.5;
  color: var(--mist);
}

.page-about .reach-facts .mono {
  display: block;
  font-size: 24px;
  line-height: 1.1;
  letter-spacing: 0.04em;
  color: var(--chalk);
}

/* ---------- 用户与认可（纸面板） ---------- */
.page-about .scale-panel {
  padding: clamp(24px, 4vw, 44px);
  color: var(--ink);
}

.page-about .scale-panel .chapter-title {
  color: var(--ink);
}

.page-about .scale-panel .chapter-no {
  color: var(--slate);
}

.page-about .scale-panel .prose p {
  color: var(--ink);
}

.page-about .scale-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: clamp(10px, 2vw, 24px);
  margin-top: clamp(22px, 3vw, 32px);
  padding-top: 20px;
  border-top: 1px solid rgba(26, 21, 18, 0.22);
}

.page-about .scale-num {
  margin: 0;
  font-size: clamp(24px, 4vw, 48px);
  line-height: 1;
  letter-spacing: 0.02em;
  color: var(--ink);
}

.page-about .scale-num span {
  font-size: 0.48em;
  margin-left: 2px;
}

.page-about .scale-label {
  margin: 10px 0 0;
  color: var(--slate);
}

.page-about .scale-prose {
  margin-top: clamp(20px, 3vw, 28px);
  padding-top: 18px;
  border-top: 1px solid rgba(26, 21, 18, 0.22);
}

/* ---------- 结尾 ---------- */
.page-about .about-cta {
  padding: clamp(36px, 6vw, 76px) 0 clamp(40px, 6vw, 72px);
}

.page-about .cta-panel {
  padding: clamp(24px, 4vw, 48px);
  background: var(--night-2);
}

.page-about .cta-eyebrow {
  margin: 0 0 14px;
  color: var(--mist);
}

.page-about .cta-title {
  margin: 0 0 clamp(22px, 3vw, 30px);
  max-width: 20em;
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 24px;
  line-height: 1.3;
  color: var(--chalk);
}

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

.page-about .cta-top {
  margin-top: clamp(20px, 3vw, 28px);
}

/* ---------- 阶梯与断点 ---------- */
@media (min-width: 760px) {
  .page-about .hero-lead,
  .page-about .prose p,
  .page-about .line-text,
  .page-about .step-text {
    font-size: 18px;
  }

  .page-about .line-item {
    grid-template-columns: 64px minmax(0, 1fr);
    gap: 0 24px;
  }

  .page-about .step:nth-child(2) {
    margin-left: 24px;
  }

  .page-about .step:nth-child(3) {
    margin-left: 48px;
  }

  .page-about .step:nth-child(4) {
    margin-left: 72px;
  }

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

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

@media (min-width: 900px) {
  .page-about .hero-grid {
    grid-template-columns: minmax(0, 1.42fr) minmax(0, 0.82fr);
    align-items: start;
  }

  .page-about .hero-figure {
    margin-top: -2.4rem;
  }
}

@media (min-width: 1000px) {
  .page-about .about-body {
    grid-template-columns: 172px minmax(0, 1fr);
    gap: clamp(36px, 5vw, 72px);
    align-items: start;
  }

  .page-about .about-index {
    position: sticky;
    top: 104px;
  }

  .page-about .index-list {
    display: block;
    overflow: visible;
    padding-bottom: 0;
    margin-top: 14px;
  }

  .page-about .index-list li + li {
    margin-top: 4px;
  }

  .page-about .index-link {
    white-space: normal;
    width: 100%;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about [data-reveal] {
    opacity: 1;
    transform: none;
    transition: none;
  }

  .page-about .index-link {
    transition: none;
  }
}
<<<END>>>