.page-about {
  --about-rail-width: 240px;
  --about-card-pad: clamp(22px, 2.8vw, 34px);
  --about-block: clamp(48px, 6.5vw, 104px);
}

/* ---------- 首屏 ---------- */
.page-about .about-intro {
  padding-block: clamp(20px, 3vw, 44px) var(--about-block);
}

.page-about .about-intro__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(30px, 4vw, 56px);
}

.page-about .about-intro__copy {
  min-width: 0;
}

.page-about .about-intro__title {
  margin: 16px 0 0;
  color: var(--paper);
  max-width: 16ch;
}

.page-about .about-intro__lead {
  margin: 24px 0 0;
  max-width: 40ch;
  color: var(--paper);
  font-size: 15px;
  line-height: 1.8;
}

.page-about .about-intro__stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 20px 16px;
  margin: 36px 0 0;
}

.page-about .about-stat {
  border-left: 2px solid var(--rail);
  padding-left: 14px;
  min-width: 0;
}

.page-about .about-stat__label {
  font-size: 12px;
  letter-spacing: 0.18em;
  color: var(--muted);
  text-transform: uppercase;
}

.page-about .about-stat__value {
  margin: 8px 0 0;
  font-family: var(--font-mono);
  font-size: clamp(24px, 3.4vw, 34px);
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--mint);
}

.page-about .about-stat__unit {
  font-family: var(--font-body);
  font-size: 13px;
  color: var(--muted);
  margin-left: 4px;
  letter-spacing: 0;
}

.page-about .about-intro__figure {
  position: relative;
  margin: 0;
  min-width: 0;
}

.page-about .about-intro__frame {
  border-radius: var(--r-lg);
  border: 1px solid var(--rail);
  background: var(--ink-800);
  overflow: hidden;
}

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

.page-about .about-intro__note {
  display: block;
  margin: 14px 0 0;
  color: var(--amber);
  letter-spacing: 0.22em;
}

/* ---------- 发展阶段 ---------- */
.page-about .about-stages {
  padding-block: var(--about-block);
  background: linear-gradient(180deg, transparent 0%, rgba(11, 31, 25, 0.62) 42%, transparent 100%);
}

.page-about .about-stages__head {
  max-width: 60ch;
  margin-bottom: clamp(28px, 4vw, 52px);
}

.page-about .about-stages__intro {
  margin: 18px 0 0;
  color: var(--muted);
  font-size: 15px;
  line-height: 1.8;
  max-width: 44ch;
}

.page-about .about-stages__layout {
  display: grid;
  grid-template-columns: 1fr;
  gap: 26px;
}

.page-about .stage-rail__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(112px, 1fr));
  gap: 4px;
}

.page-about .stage-rail__item {
  min-width: 0;
}

.page-about .stage-rail__link {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: 14px 14px 14px 16px;
  border-left: 2px solid var(--rail);
  border-radius: 0 var(--r-sm) var(--r-sm) 0;
  color: var(--muted);
  text-decoration: none;
  transition: border-color 180ms var(--ease), color 180ms var(--ease), background-color 180ms var(--ease);
}

.page-about .stage-rail__link:hover,
.page-about .stage-rail__link:focus-visible {
  border-color: var(--mint);
  color: var(--paper);
  background: var(--ink-800);
}

.page-about .stage-rail__year {
  font-size: 17px;
  letter-spacing: -0.01em;
  color: var(--mint);
}

.page-about .stage-rail__name {
  font-size: 12px;
  letter-spacing: 0.14em;
  color: inherit;
}

.page-about .stage-body {
  display: grid;
  gap: 16px;
  min-width: 0;
}

.page-about .stage-card {
  position: relative;
  padding: var(--about-card-pad);
  padding-right: clamp(48px, 5vw, 64px);
  scroll-margin-top: 96px;
  min-width: 0;
}

.page-about .stage-card__note {
  position: absolute;
  top: clamp(20px, 2.4vw, 30px);
  right: clamp(12px, 1.4vw, 20px);
  color: var(--muted);
  letter-spacing: 0.24em;
  margin: 0;
}

.page-about .stage-card__title {
  margin: 0 0 12px;
  font-family: var(--font-display);
  font-size: clamp(20px, 2.3vw, 27px);
  font-weight: 800;
  line-height: 1.25;
  letter-spacing: -0.015em;
  color: var(--paper);
}

.page-about .stage-card__body {
  margin: 0;
  max-width: 62ch;
  color: var(--muted);
  font-size: 15px;
  line-height: 1.8;
}

/* ---------- 团队 ---------- */
.page-about .about-team {
  padding-block: var(--about-block);
}

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

.page-about .about-team__lead {
  min-width: 0;
}

.page-about .about-team__body {
  margin: 20px 0 0;
  max-width: 42ch;
  color: var(--muted);
  font-size: 15px;
  line-height: 1.8;
}

.page-about .about-team__figure {
  margin: 28px 0 0;
}

.page-about .about-team__figure .media-frame {
  border-radius: var(--r-lg);
  border: 1px solid var(--rail);
  overflow: hidden;
}

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

.page-about .about-team__cards {
  display: grid;
  grid-template-columns: 1fr;
  gap: 14px;
  min-width: 0;
}

.page-about .team-card {
  position: relative;
  padding: 26px 22px 24px;
  overflow: hidden;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.page-about .team-card::before {
  content: "";
  position: absolute;
  inset: 0 0 auto 0;
  height: 3px;
  background: linear-gradient(90deg, var(--mint) 0%, rgba(43, 240, 196, 0) 100%);
  opacity: 0.6;
}

.page-about .team-card__role {
  margin: 0;
  font-size: 11px;
  letter-spacing: 0.22em;
  color: var(--mint-soft);
  text-transform: uppercase;
}

.page-about .team-card__title {
  margin: 0;
  font-family: var(--font-display);
  font-size: 19px;
  font-weight: 800;
  letter-spacing: -0.01em;
  color: var(--paper);
}

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

.page-about .team-card__detail {
  display: block;
  margin-top: auto;
  padding-top: 14px;
  border-top: 1px solid var(--rail);
  font-size: 13px;
  line-height: 1.7;
  color: var(--muted);
  transition: color 180ms var(--ease);
}

.page-about .team-card:hover .team-card__detail,
.page-about .team-card:focus-within .team-card__detail {
  color: var(--mint-soft);
}

/* ---------- 生产链路 ---------- */
.page-about .about-pipeline {
  padding-block: var(--about-block);
}

.page-about .about-pipeline__head {
  max-width: 56ch;
}

.page-about .pipeline-list {
  list-style: none;
  margin: clamp(28px, 4vw, 46px) 0 0;
  padding: 0;
  display: grid;
  gap: 0;
}

.page-about .pipeline-step {
  display: grid;
  grid-template-columns: 46px minmax(0, 1fr);
  gap: 16px;
  padding: 22px 0;
  border-top: 1px solid var(--rail);
  min-width: 0;
  transition: border-color 180ms var(--ease);
}

.page-about .pipeline-step:last-child {
  border-bottom: 1px solid var(--rail);
}

.page-about .pipeline-step:hover {
  border-top-color: var(--mint);
}

.page-about .pipeline-step__index {
  font-size: 20px;
  line-height: 1;
  padding-top: 4px;
  color: var(--mint);
  letter-spacing: -0.02em;
}

.page-about .pipeline-step__body {
  min-width: 0;
}

.page-about .pipeline-step__title {
  margin: 0 0 8px;
  font-family: var(--font-display);
  font-size: 18px;
  font-weight: 700;
  letter-spacing: -0.01em;
  color: var(--paper);
}

.page-about .pipeline-step__body p {
  margin: 0;
  max-width: 62ch;
  color: var(--muted);
  font-size: 15px;
  line-height: 1.8;
}

/* ---------- 速度 ---------- */
.page-about .about-speed {
  padding-block: var(--about-block);
  background: linear-gradient(180deg, transparent 0%, rgba(18, 49, 40, 0.55) 50%, transparent 100%);
}

.page-about .about-speed__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(28px, 4vw, 52px);
}

.page-about .about-speed__copy {
  min-width: 0;
}

.page-about .about-speed__body {
  margin: 20px 0 0;
  max-width: 42ch;
  color: var(--muted);
  font-size: 15px;
  line-height: 1.8;
}

.page-about .about-speed__facts {
  list-style: none;
  margin: 30px 0 0;
  padding: 0;
  display: grid;
  gap: 10px;
}

.page-about .about-speed__facts li {
  display: flex;
  align-items: baseline;
  gap: 14px;
  padding: 13px 18px;
  border-radius: var(--r-pill);
  border: 1px solid var(--rail);
  background: var(--ink-800);
  min-width: 0;
  transition: border-color 180ms var(--ease);
}

.page-about .about-speed__facts li:hover {
  border-color: var(--amber-deep);
}

.page-about .about-speed__facts strong {
  font-family: var(--font-mono);
  font-size: 17px;
  font-weight: 500;
  color: var(--amber);
  white-space: nowrap;
}

.page-about .about-speed__facts span {
  color: var(--muted);
  font-size: 14px;
  line-height: 1.6;
}

.page-about .about-speed__figure {
  margin: 0;
  min-width: 0;
}

.page-about .about-speed__figure .media-frame {
  border-radius: var(--r-lg);
  border: 1px solid var(--rail);
  overflow: hidden;
}

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

/* ---------- 合作 ---------- */
.page-about .about-partners {
  padding-block: var(--about-block);
}

.page-about .about-partners__head {
  max-width: 58ch;
}

.page-about .about-partners__grid {
  margin-top: clamp(28px, 4vw, 44px);
}

.page-about .partner-card {
  position: relative;
  display: flex;
  flex-direction: column;
  gap: 12px;
  padding: 26px 22px 30px;
  overflow: hidden;
}

.page-about .partner-card::after {
  content: "";
  position: absolute;
  left: 22px;
  right: 22px;
  bottom: 0;
  height: 2px;
  border-radius: 2px;
  opacity: 0.45;
  background: linear-gradient(90deg, var(--mint), rgba(43, 240, 196, 0));
}

.page-about .partner-card:nth-child(2)::after {
  background: linear-gradient(90deg, var(--amber), rgba(255, 176, 58, 0));
}

.page-about .partner-card:nth-child(3)::after {
  background: linear-gradient(90deg, var(--mint-soft), rgba(168, 255, 230, 0));
}

.page-about .partner-card .tag {
  align-self: flex-start;
}

.page-about .partner-card__title {
  margin: 0;
  font-family: var(--font-display);
  font-size: 19px;
  font-weight: 800;
  letter-spacing: -0.01em;
  color: var(--paper);
}

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

/* ---------- 三件事 ---------- */
.page-about .about-principles {
  padding-block: var(--about-block);
}

.page-about .about-principles__head {
  max-width: 52ch;
}

.page-about .principle-list {
  list-style: none;
  margin: clamp(28px, 4vw, 44px) 0 0;
  padding: 0;
  display: grid;
  gap: 14px;
}

.page-about .principle-item {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 18px;
  padding: 24px 24px 26px;
  border-radius: var(--r-md);
  border: 1px solid var(--rail);
  background: var(--ink-800);
  min-width: 0;
  transition: border-color 180ms var(--ease), transform 180ms var(--ease);
}

.page-about .principle-item:hover,
.page-about .principle-item:focus-within {
  border-color: var(--mint);
  transform: translateY(-2px);
}

.page-about .principle-item__num {
  font-size: 15px;
  line-height: 1;
  padding-top: 4px;
  color: var(--amber);
}

.page-about .principle-item__body {
  min-width: 0;
}

.page-about .principle-item__title {
  margin: 0 0 8px;
  font-family: var(--font-display);
  font-size: 18px;
  font-weight: 700;
  letter-spacing: -0.01em;
  color: var(--paper);
}

.page-about .principle-item__body p {
  margin: 0;
  max-width: 58ch;
  color: var(--muted);
  font-size: 15px;
  line-height: 1.8;
}

/* ---------- 收尾 ---------- */
.page-about .about-close {
  padding-block: var(--about-block) clamp(56px, 8vw, 120px);
}

.page-about .about-close__panel {
  display: grid;
  gap: 26px;
  padding: clamp(26px, 3.6vw, 48px);
}

.page-about .about-close__copy {
  min-width: 0;
}

.page-about .about-close__copy p {
  margin: 18px 0 0;
  max-width: 48ch;
  color: var(--muted);
  font-size: 15px;
  line-height: 1.8;
}

.page-about .about-close__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  align-items: center;
}

/* ---------- 响应式 ---------- */
@media (min-width: 640px) {
  .page-about .about-intro__lead {
    font-size: 16px;
  }

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

  .page-about .about-team__cards .team-card:last-child {
    grid-column: span 2;
  }
}

@media (min-width: 900px) {
  .page-about .about-intro__grid {
    grid-template-columns: minmax(0, 1.06fr) minmax(0, 1fr);
    align-items: center;
  }

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

  .page-about .about-intro__note {
    position: absolute;
    top: 12px;
    right: -30px;
    margin: 0;
  }

  .page-about .about-stages__layout {
    grid-template-columns: var(--about-rail-width) minmax(0, 1fr);
    gap: clamp(36px, 4.6vw, 64px);
    align-items: start;
  }

  .page-about .stage-rail {
    position: sticky;
    top: 96px;
  }

  .page-about .stage-rail__list {
    grid-template-columns: 1fr;
  }

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

  .page-about .about-team__cards {
    grid-template-columns: 1fr;
  }

  .page-about .about-team__cards .team-card:last-child {
    grid-column: auto;
  }

  .page-about .about-speed__grid {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1.05fr);
    align-items: center;
  }

  .page-about .about-close__panel {
    grid-template-columns: minmax(0, 1.4fr) minmax(0, 1fr);
    align-items: center;
    gap: 40px;
  }
}

@media (min-width: 1080px) {
  .page-about .about-stages__layout {
    grid-template-columns: clamp(220px, 18vw, 260px) minmax(0, 1fr);
  }

  .page-about .pipeline-step {
    grid-template-columns: 60px minmax(0, 1fr);
    gap: 22px;
    padding: 26px 0;
  }

  .page-about .pipeline-step__index {
    font-size: 24px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .stage-rail__link,
  .page-about .team-card__detail,
  .page-about .about-speed__facts li,
  .page-about .principle-item,
  .page-about .pipeline-step {
    transition: none;
  }

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