.page-about {
  --ab-line: rgba(138, 155, 176, 0.22);
  color: var(--paper-100);
  background: var(--ink-900);
  padding-bottom: 56px;
}

/* 面包屑 */
.page-about .breadcrumb {
  padding-top: 20px;
  padding-bottom: 4px;
}

/* 首屏 */
.page-about .about-hero {
  position: relative;
  padding-top: 16px;
  padding-bottom: 52px;
  border-bottom: 1px dashed var(--line-soft);
  background-image:
    radial-gradient(ellipse at 12% 0%, rgba(40, 224, 208, 0.10), transparent 62%),
    radial-gradient(ellipse at 100% 100%, rgba(123, 97, 255, 0.10), transparent 62%);
}

.page-about .about-hero .eyebrow {
  margin: 0 0 14px;
}

.page-about .about-hero h1 {
  font-family: var(--font-head);
  font-size: clamp(28px, 5.4vw, 48px);
  font-weight: 900;
  line-height: 1.16;
  letter-spacing: -0.01em;
  margin: 0 0 20px;
  max-width: 22ch;
}

.page-about .hero-lead {
  font-size: 15px;
  line-height: 1.9;
  color: var(--gray-400);
  max-width: 60ch;
  margin: 0 0 30px;
}

.page-about .hero-stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 10px;
}

.page-about .stat {
  padding: 16px 16px 14px;
  border: 1px solid var(--line-soft);
  border-radius: var(--radius-md);
  background: rgba(18, 58, 94, 0.42);
}

.page-about .stat-num {
  font-family: var(--font-data);
  font-size: 26px;
  font-weight: 700;
  line-height: 1;
  color: var(--cyan-400);
  display: block;
}

.page-about .stat-label {
  display: block;
  margin-top: 8px;
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--gray-400);
}

/* 章节通用 */
.page-about .section {
  padding-top: 52px;
  padding-bottom: 52px;
  position: relative;
}

.page-about .section + .section {
  border-top: 1px dashed var(--line-soft);
}

.page-about .section-head {
  margin-bottom: 28px;
}

.page-about .section-head h2 {
  font-family: var(--font-head);
  font-size: clamp(23px, 3.8vw, 34px);
  font-weight: 900;
  line-height: 1.22;
  letter-spacing: -0.01em;
  margin: 8px 0 14px;
  max-width: 26ch;
}

.page-about .section-lead {
  margin: 0;
  font-size: 15px;
  line-height: 1.9;
  color: var(--gray-400);
  max-width: 62ch;
}

/* 时间线视觉 */
.page-about .tl-visual {
  margin: 0 0 30px;
  padding: 0;
  border: 1px solid var(--line-soft);
  border-radius: var(--radius-md);
  overflow: hidden;
}

.page-about .tl-visual img {
  display: block;
  width: 100%;
  height: auto;
  filter: saturate(0.85) contrast(1.05);
}

.page-about .tl-visual figcaption {
  padding: 10px 14px;
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--gray-400);
  border-top: 1px solid var(--line-soft);
  background: rgba(18, 58, 94, 0.32);
}

/* 垂直时间线 */
.page-about .timeline {
  list-style: none;
  margin: 0;
  padding: 0;
  position: relative;
}

.page-about .timeline::before {
  content: "";
  position: absolute;
  left: 15px;
  top: 8px;
  bottom: 8px;
  width: 2px;
  background: linear-gradient(180deg, var(--cyan-400) 0%, var(--violet-500) 62%, rgba(123, 97, 255, 0) 100%);
}

.page-about .tl-item {
  position: relative;
  padding: 0 0 28px 52px;
}

.page-about .tl-item:last-child {
  padding-bottom: 0;
}

.page-about .tl-item::before {
  content: "";
  position: absolute;
  left: 8px;
  top: 4px;
  width: 16px;
  height: 16px;
  border-radius: 50%;
  background: var(--ink-900);
  border: 2px solid var(--cyan-400);
  box-shadow: 0 0 0 6px rgba(40, 224, 208, 0.14);
  z-index: 1;
}

.page-about .tl-item--violet::before {
  border-color: var(--violet-500);
  box-shadow: 0 0 0 6px rgba(123, 97, 255, 0.14);
}

.page-about .tl-node {
  margin-bottom: 8px;
}

.page-about .tl-year {
  font-family: var(--font-data);
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.14em;
  color: var(--cyan-400);
}

.page-about .tl-item--violet .tl-year {
  color: var(--violet-500);
}

.page-about .tl-card {
  padding: 18px 20px;
  border: 1px solid var(--line-soft);
  border-radius: var(--radius-md);
  background: linear-gradient(155deg, rgba(18, 58, 94, 0.72), rgba(11, 37, 69, 0.72));
  transition: transform 0.25s var(--ease), border-color 0.25s var(--ease);
}

.page-about .tl-card:hover {
  transform: translateY(-2px);
  border-color: var(--line-cyan);
}

.page-about .tl-card h3 {
  font-family: var(--font-head);
  font-size: 18px;
  font-weight: 800;
  line-height: 1.35;
  margin: 0 0 10px;
  color: var(--paper-100);
}

.page-about .tl-card p {
  margin: 0;
  font-size: 14px;
  line-height: 1.88;
  color: var(--gray-400);
}

/* 团队分工 */
.page-about .team-grid {
  display: grid;
  gap: 14px;
  grid-template-columns: minmax(0, 1fr);
}

.page-about .team-card {
  position: relative;
  padding: 20px 20px 18px;
  border: 1px solid var(--line-soft);
  border-radius: var(--radius-md);
  background: var(--ink-800);
  outline: none;
  transition: transform 0.25s var(--ease), border-color 0.25s var(--ease);
}

.page-about .team-card:hover {
  transform: translateY(-3px);
  border-color: var(--cyan-400);
}

.page-about .team-card:focus-visible {
  transform: translateY(-3px);
  border-color: var(--cyan-400);
  box-shadow: 0 0 0 2px var(--ink-900), 0 0 0 4px rgba(40, 224, 208, 0.65);
}

.page-about .team-card .tag {
  display: inline-block;
  margin-bottom: 12px;
}

.page-about .team-card h3 {
  font-family: var(--font-head);
  font-size: 18px;
  font-weight: 800;
  letter-spacing: -0.005em;
  margin: 0 0 10px;
}

.page-about .team-card p {
  margin: 0;
  font-size: 14px;
  line-height: 1.82;
  color: var(--gray-400);
}

.page-about .team-extra {
  max-height: 0;
  opacity: 0;
  overflow: hidden;
  transition: max-height 0.35s var(--ease), opacity 0.3s var(--ease);
}

.page-about .team-extra p {
  margin: 12px 0 0;
  padding-top: 12px;
  border-top: 1px dashed var(--line-soft);
}

.page-about .team-card:hover .team-extra,
.page-about .team-card:focus-within .team-extra {
  max-height: 220px;
  opacity: 1;
}

@media (hover: none) {
  .page-about .team-extra {
    max-height: none;
    opacity: 1;
  }
}

/* 品质流程 */
.page-about .process-visual {
  margin: 0 0 28px;
  border: 1px solid var(--line-soft);
  border-radius: var(--radius-md);
  overflow: hidden;
}

.page-about .process-visual img {
  display: block;
  width: 100%;
  height: auto;
  filter: saturate(0.85) contrast(1.05);
}

.page-about .process-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 14px;
  grid-template-columns: minmax(0, 1fr);
}

.page-about .process-step {
  position: relative;
  padding: 22px 22px 20px;
  border-radius: var(--radius-md);
  background: var(--paper-100);
  color: var(--black-900);
  box-shadow: 0 20px 40px -32px rgba(0, 0, 0, 0.6);
  transition: transform 0.25s var(--ease);
}

.page-about .process-step::after {
  content: "";
  position: absolute;
  top: 0;
  left: 22px;
  right: 22px;
  height: 2px;
  background: var(--cyan-400);
  opacity: 0.8;
}

.page-about .process-step:hover {
  transform: translateY(-2px);
}

.page-about .step-num {
  font-family: var(--font-data);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.16em;
  color: var(--violet-500);
  display: block;
  margin-bottom: 8px;
}

.page-about .process-step h3 {
  font-family: var(--font-head);
  font-size: 18px;
  font-weight: 800;
  margin: 0 0 10px;
  color: var(--black-900);
}

.page-about .process-step p {
  margin: 0;
  font-size: 14px;
  line-height: 1.85;
  color: var(--black-900);
}

/* 合作与观察 */
.page-about .eco-grid {
  display: grid;
  gap: 14px;
  grid-template-columns: minmax(0, 1fr);
  margin-bottom: 28px;
}

.page-about .eco-card {
  padding: 22px 20px 20px;
  border: 1px solid var(--line-soft);
  border-radius: var(--radius-md);
  background: linear-gradient(160deg, rgba(18, 58, 94, 0.55), rgba(11, 37, 69, 0.55));
  transition: transform 0.25s var(--ease), border-color 0.25s var(--ease);
}

.page-about .eco-card:hover {
  transform: translateY(-2px);
  border-color: var(--line-cyan);
}

.page-about .eco-num {
  font-family: var(--font-data);
  font-size: 38px;
  font-weight: 700;
  line-height: 1;
  color: var(--cyan-400);
  display: inline-block;
  margin-bottom: 10px;
}

.page-about .eco-card--mint .eco-num {
  color: var(--mint-450);
}

.page-about .eco-card h3 {
  font-family: var(--font-head);
  font-size: 16px;
  font-weight: 700;
  margin: 0 0 10px;
  color: var(--paper-100);
}

.page-about .eco-card p {
  margin: 0;
  font-size: 14px;
  line-height: 1.85;
  color: var(--gray-400);
}

.page-about .eco-visual {
  margin: 0;
  border: 1px solid var(--line-soft);
  border-radius: var(--radius-md);
  overflow: hidden;
}

.page-about .eco-visual img {
  display: block;
  width: 100%;
  height: auto;
  filter: saturate(0.8) contrast(1.05);
}

/* 下一步 */
.page-about .section--cta {
  padding-bottom: 72px;
}

.page-about .cta-block {
  padding: 30px 22px 26px;
  border: 1px solid var(--line-cyan);
  border-radius: var(--radius-lg);
  background:
    radial-gradient(circle at 18% 0%, rgba(40, 224, 208, 0.15), transparent 62%),
    var(--ink-800);
}

.page-about .cta-block h2 {
  font-family: var(--font-head);
  font-size: clamp(22px, 3.6vw, 32px);
  font-weight: 900;
  line-height: 1.2;
  margin: 8px 0 16px;
  max-width: 22ch;
}

.page-about .cta-lead {
  margin: 0 0 22px;
  font-size: 15px;
  line-height: 1.88;
  color: var(--gray-400);
  max-width: 62ch;
}

.page-about .cta-links {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

/* 平板 */
@media (min-width: 640px) {
  .page-about .about-hero {
    padding-top: 24px;
    padding-bottom: 58px;
  }

  .page-about .hero-lead {
    font-size: 16px;
  }

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

  .page-about .stat-num {
    font-size: 28px;
  }

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

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

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

  .page-about .section {
    padding-top: 64px;
    padding-bottom: 64px;
  }
}

/* 桌面：非对称时间线 */
@media (min-width: 900px) {
  .page-about .about-hero {
    padding-top: 32px;
    padding-bottom: 68px;
  }

  .page-about .section {
    padding-top: 76px;
    padding-bottom: 76px;
  }

  .page-about .team-grid {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 16px;
  }

  .page-about .timeline::before {
    left: 159px;
  }

  .page-about .tl-item {
    padding: 0 0 40px 204px;
  }

  .page-about .tl-item:last-child {
    padding-bottom: 0;
  }

  .page-about .tl-node {
    position: absolute;
    left: 0;
    top: 6px;
    width: 140px;
    text-align: right;
    margin: 0;
  }

  .page-about .tl-item::before {
    left: 152px;
    top: 8px;
  }

  .page-about .tl-card {
    padding: 20px 24px;
  }

  .page-about .eco-grid {
    grid-template-columns: 1.2fr 1fr 1fr;
    align-items: stretch;
  }

  .page-about .cta-block {
    padding: 40px 36px 34px;
  }
}
<<<END>>>