.page-about {
  overflow-x: hidden;
}

.page-about .section {
  padding: 48px 0;
}

@media (min-width: 900px) {
  .page-about .section {
    padding: 74px 0;
  }
}

/* ---------- 首屏 ---------- */

.page-about .about-hero {
  position: relative;
  padding: 34px 0 52px;
  border-bottom: 1px solid var(--line);
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(to right, var(--grid) 1px, transparent 1px),
    linear-gradient(to bottom, var(--grid) 1px, transparent 1px);
  background-size: 72px 72px;
  -webkit-mask-image: linear-gradient(to bottom, rgba(0, 0, 0, 0.85), transparent 88%);
  mask-image: linear-gradient(to bottom, rgba(0, 0, 0, 0.85), transparent 88%);
  pointer-events: none;
}

.page-about .about-hero > .container {
  position: relative;
  z-index: 1;
}

.page-about .about-hero-grid {
  display: grid;
  gap: 30px;
}

@media (min-width: 900px) {
  .page-about .about-hero-grid {
    grid-template-columns: minmax(0, 1.3fr) minmax(0, 0.7fr);
    gap: 48px;
    align-items: start;
  }
}

.page-about .about-hero .title-xl {
  font-family: var(--font-display);
  font-weight: 800;
  letter-spacing: -0.02em;
  line-height: 1.16;
  font-size: 32px;
  margin: 12px 0 0;
  max-width: 20em;
}

@media (min-width: 720px) {
  .page-about .about-hero .title-xl {
    font-size: 42px;
  }
}

@media (min-width: 1080px) {
  .page-about .about-hero .title-xl {
    font-size: 48px;
  }
}

.page-about .about-hero .lede {
  margin: 18px 0 0;
  max-width: 44em;
}

.page-about .about-hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 26px;
}

.page-about .hero-figure {
  position: relative;
  background: var(--panel);
  padding: 24px 22px 20px;
  border-left: 3px solid var(--copper);
  border-radius: var(--radius);
  clip-path: polygon(0 0, calc(100% - 22px) 0, 100% 22px, 100% 100%, 0 100%);
}

.page-about .hero-figure-title {
  margin: 0 0 4px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--muted);
}

.page-about .hero-figure-list {
  list-style: none;
  margin: 6px 0 0;
  padding: 0;
}

.page-about .hero-figure-row {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 4px 12px;
  padding: 14px 0;
  border-bottom: 1px dashed var(--line-soft);
}

.page-about .hero-figure-row:last-child {
  border-bottom: 0;
}

.page-about .hero-figure-num {
  font-size: 28px;
  line-height: 1;
  color: var(--text);
  letter-spacing: 0.02em;
}

.page-about .hero-figure-unit {
  font-size: 13px;
  color: var(--muted);
  margin-left: 3px;
  letter-spacing: 0;
}

.page-about .hero-figure-label {
  font-size: 13px;
  color: var(--muted);
  line-height: 1.5;
}

.page-about .hero-figure-note {
  margin: 14px 0 0;
  padding-top: 12px;
  border-top: 1px solid var(--line);
  font-size: 13px;
  color: var(--muted);
  line-height: 1.6;
}

/* ---------- 章节头 ---------- */

.page-about .about-head {
  margin-bottom: 28px;
  padding-left: 16px;
  border-left: 3px solid var(--cyan);
}

.page-about .about-head--tight {
  margin-bottom: 20px;
}

.page-about .about-head .eyebrow {
  margin: 0 0 8px;
}

.page-about .about-head .title-lg {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 800;
  letter-spacing: -0.015em;
  line-height: 1.24;
  font-size: 25px;
}

@media (min-width: 720px) {
  .page-about .about-head .title-lg {
    font-size: 31px;
  }
}

/* ---------- 我们做什么 ---------- */

.page-about .about-scope-body p {
  margin: 0 0 16px;
  max-width: 52em;
  color: var(--muted);
}

.page-about .about-scope-body p:first-child {
  color: var(--text);
}

.page-about .stat-strip {
  list-style: none;
  margin: 30px 0 0;
  padding: 0;
  display: grid;
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
}

@media (min-width: 640px) {
  .page-about .stat-strip {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (min-width: 980px) {
  .page-about .stat-strip {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

.page-about .stat-item {
  background: var(--panel);
  padding: 20px 18px;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.page-about .stat-num {
  font-size: 30px;
  line-height: 1;
  color: var(--cyan);
  letter-spacing: 0.02em;
}

.page-about .stat-label {
  font-size: 13px;
  line-height: 1.6;
  color: var(--muted);
}

/* ---------- 历程时间轴 ---------- */

.page-about .timeline {
  display: grid;
  gap: 26px;
}

@media (min-width: 900px) {
  .page-about .timeline {
    grid-template-columns: 232px minmax(0, 1fr);
    gap: 44px;
    align-items: start;
  }

  .page-about .timeline-nav {
    position: sticky;
    top: 120px;
  }
}

.page-about .timeline-nav-list {
  position: relative;
  list-style: none;
  margin: 0;
  padding-left: 20px;
}

.page-about .timeline-nav-list::before {
  content: "";
  position: absolute;
  left: 4px;
  top: 10px;
  bottom: 10px;
  width: 1px;
  background: var(--line);
}

.page-about .timeline-nav-list li {
  position: relative;
}

.page-about .timeline-nav-list li + li {
  margin-top: 12px;
}

.page-about .timeline-nav-list li::before {
  content: "";
  position: absolute;
  left: -20px;
  top: 10px;
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--copper);
  box-shadow: 0 0 0 3px var(--bg);
}

.page-about .timeline-link {
  display: block;
  padding: 4px 0;
  color: var(--muted);
  text-decoration: none;
  font-size: 14px;
  line-height: 1.5;
  transition: color var(--ease);
}

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

.page-about .timeline-body {
  display: grid;
  gap: 16px;
}

.page-about .timeline-entry {
  position: relative;
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 22px 20px 20px;
  scroll-margin-top: 120px;
}

.page-about .timeline-entry::before {
  content: "";
  position: absolute;
  left: 0;
  top: 20px;
  bottom: 20px;
  width: 2px;
  background: var(--cyan-deep);
}

.page-about .timeline-year {
  display: inline-block;
  font-size: 12px;
  letter-spacing: 0.12em;
  color: var(--copper);
  margin-bottom: 8px;
}

.page-about .timeline-entry .title-md {
  margin: 0 0 8px;
  font-family: var(--font-display);
  font-weight: 800;
  letter-spacing: -0.01em;
  font-size: 19px;
  line-height: 1.35;
}

.page-about .timeline-entry p {
  margin: 0;
  font-size: 15px;
  line-height: 1.75;
  color: var(--muted);
}

/* ---------- 生产流程 ---------- */

.page-about .process-grid {
  display: grid;
  gap: 28px;
}

@media (min-width: 940px) {
  .page-about .process-grid {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
    gap: 40px;
    align-items: start;
  }
}

.page-about .process-steps {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 2px;
  background: var(--line);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
}

.page-about .process-step {
  background: var(--panel-2);
  padding: 18px 18px 18px 20px;
  border-left: 3px solid transparent;
  transition: border-color var(--ease), background-color var(--ease);
}

.page-about .process-step:hover {
  background: var(--panel);
  border-left-color: var(--cyan);
}

.page-about .proc-no {
  display: block;
  font-size: 11px;
  letter-spacing: 0.16em;
  color: var(--cyan);
  margin-bottom: 6px;
}

.page-about .proc-title {
  margin: 0 0 6px;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 17px;
  line-height: 1.35;
}

.page-about .process-step p {
  margin: 0;
  font-size: 14px;
  line-height: 1.72;
  color: var(--muted);
}

.page-about .process-note {
  margin: 18px 0 0;
  padding: 14px 16px;
  background: var(--cyan-deep);
  border-radius: var(--radius);
  font-size: 14px;
  line-height: 1.7;
  color: var(--text);
}

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

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

/* ---------- 团队 ---------- */

.page-about .role-grid {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 14px;
}

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

@media (min-width: 1000px) {
  .page-about .role-grid {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

.page-about .role-card {
  position: relative;
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 20px 18px;
  transition: transform var(--ease), border-color var(--ease);
}

.page-about .role-card:hover,
.page-about .role-card:focus-within {
  transform: translateY(-2px);
  border-color: var(--cyan);
  outline: none;
}

.page-about .role-card:focus-visible {
  outline: 2px solid var(--cyan);
  outline-offset: 2px;
}

.page-about .role-no {
  display: inline-block;
  font-size: 11px;
  letter-spacing: 0.14em;
  color: var(--copper);
  border: 1px solid var(--line);
  border-radius: 2px;
  padding: 2px 6px;
  margin-bottom: 12px;
}

.page-about .role-name {
  margin: 0 0 8px;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 18px;
  line-height: 1.3;
}

.page-about .role-desc {
  margin: 0;
  font-size: 14px;
  line-height: 1.7;
  color: var(--muted);
}

.page-about .role-more {
  list-style: none;
  margin: 0;
  padding: 0;
  max-height: 12em;
  overflow: hidden;
  transition: max-height var(--ease), opacity var(--ease), margin-top var(--ease);
  opacity: 1;
}

.page-about .role-more li {
  position: relative;
  padding-left: 12px;
  font-size: 13px;
  line-height: 1.7;
  color: var(--muted);
  border-top: 1px dashed var(--line-soft);
  margin-top: 8px;
  padding-top: 8px;
}

.page-about .role-more li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 15px;
  width: 4px;
  height: 4px;
  border-radius: 50%;
  background: var(--copper);
}

@media (hover: hover) and (min-width: 780px) {
  .page-about .role-more {
    max-height: 0;
    opacity: 0;
    margin-top: 0;
  }

  .page-about .role-card:hover .role-more,
  .page-about .role-card:focus-within .role-more {
    max-height: 16em;
    opacity: 1;
    margin-top: 8px;
  }
}

.page-about .team-figure-row {
  display: grid;
  gap: 22px;
  margin-top: 26px;
}

@media (min-width: 940px) {
  .page-about .team-figure-row {
    grid-template-columns: minmax(0, 1.15fr) minmax(0, 0.85fr);
    gap: 36px;
    align-items: center;
  }
}

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

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

.page-about .team-figure-text p {
  margin: 0 0 14px;
  font-size: 15px;
  line-height: 1.78;
  color: var(--muted);
}

.page-about .team-figure-text p:first-child {
  color: var(--text);
}

/* ---------- 资质与合作 ---------- */

.page-about .credential-grid {
  display: grid;
  gap: 28px;
}

@media (min-width: 940px) {
  .page-about .credential-grid {
    grid-template-columns: minmax(0, 0.8fr) minmax(0, 1.2fr);
    gap: 44px;
    align-items: start;
  }
}

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

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

.page-about .credential-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 12px;
}

.page-about .credential-item {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 18px 18px 16px;
}

.page-about .credential-tag {
  display: inline-block;
  margin-bottom: 10px;
}

.page-about .credential-title {
  margin: 0 0 8px;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 16px;
  line-height: 1.4;
}

.page-about .credential-item p {
  margin: 0;
  font-size: 14px;
  line-height: 1.72;
  color: var(--muted);
}

/* ---------- 四条判断 ---------- */

.page-about .about-principles {
  position: relative;
  background-color: var(--panel);
  background-image: repeating-linear-gradient(
    102deg,
    transparent 0 22px,
    rgba(42, 58, 82, 0.4) 22px 23px
  );
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}

.page-about .principle-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 14px;
}

@media (min-width: 780px) {
  .page-about .principle-list {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 18px;
  }
}

.page-about .principle-item {
  background: var(--bg);
  border: 1px solid var(--line);
  border-left: 3px solid var(--copper);
  border-radius: var(--radius);
  padding: 20px 20px 18px;
  transition: transform var(--ease), border-left-color var(--ease);
}

.page-about .principle-item:hover {
  transform: translateY(-2px);
  border-left-color: var(--cyan);
}

.page-about .principle-no {
  display: block;
  font-size: 11px;
  letter-spacing: 0.16em;
  color: var(--orange);
  margin-bottom: 10px;
}

.page-about .principle-title {
  margin: 0 0 8px;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 19px;
  line-height: 1.35;
}

.page-about .principle-item p {
  margin: 0;
  font-size: 14px;
  line-height: 1.74;
  color: var(--muted);
}

/* ---------- 下一步 ---------- */

.page-about .next-panel {
  display: grid;
  gap: 22px;
  background: var(--panel-2);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 26px 22px;
  clip-path: polygon(0 0, calc(100% - 26px) 0, 100% 26px, 100% 100%, 0 100%);
}

@media (min-width: 860px) {
  .page-about .next-panel {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
    gap: 32px;
    align-items: center;
    padding: 34px 30px;
  }
}

.page-about .next-text .title-md {
  margin: 0 0 10px;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 21px;
  line-height: 1.35;
}

.page-about .next-text p {
  margin: 0;
  font-size: 14px;
  line-height: 1.7;
  color: var(--muted);
}

.page-about .next-links {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 8px;
}

@media (min-width: 520px) {
  .page-about .next-links {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

.page-about .next-link {
  display: block;
  padding: 12px 14px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  color: var(--text);
  text-decoration: none;
  font-size: 14px;
  line-height: 1.4;
  transition: border-color var(--ease), color var(--ease), background-color var(--ease);
}

.page-about .next-link:hover,
.page-about .next-link:focus-visible {
  border-color: var(--cyan);
  color: var(--cyan);
  background: var(--cyan-deep);
}

.page-about .next-link:focus-visible {
  outline: 2px solid var(--cyan);
  outline-offset: 2px;
}

/* ---------- 减少动效 ---------- */

@media (prefers-reduced-motion: reduce) {
  .page-about .role-card,
  .page-about .principle-item,
  .page-about .role-more,
  .page-about .timeline-link,
  .page-about .next-link,
  .page-about .process-step {
    transition: opacity var(--ease);
    transform: none;
  }

  .page-about .role-card:hover,
  .page-about .role-card:focus-within,
  .page-about .principle-item:hover {
    transform: none;
  }
}
<<<END>>>