.page-about {
  --pa-track-w: 2px;
  --pa-node: 16px;
}

.page-about .about-crumb {
  padding-top: clamp(18px, 3vw, 32px);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  padding-top: clamp(18px, 3vw, 34px);
}

.page-about .about-hero__intro .lead {
  max-width: 42ch;
}

.page-about .about-hero__panel {
  background: var(--deep-700);
  border: 1px solid var(--deep-500);
  border-radius: var(--r-lg);
  padding: clamp(20px, 2.6vw, 30px);
}

.page-about .about-keys {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 18px 20px;
}

.page-about .about-keys li {
  display: flex;
  flex-direction: column;
  gap: 5px;
}

.page-about .about-keys__num {
  font-size: clamp(26px, 3.4vw, 38px);
  color: var(--green-400);
  line-height: 1.05;
}

.page-about .about-keys__label {
  font-size: 13px;
  color: var(--gray-400);
  line-height: 1.5;
}

.page-about .about-hero__visual {
  margin-top: clamp(26px, 4vw, 46px);
}

/* ---------- 章节头 ---------- */
.page-about .about-section-head {
  max-width: 62ch;
}

.page-about .about-section-head--tight {
  margin-bottom: clamp(22px, 3vw, 34px);
}

.page-about .about-section-head__lead {
  margin: clamp(12px, 1.8vw, 16px) 0 0;
  color: var(--text-soft);
  font-size: 16px;
  line-height: 1.75;
}

.page-about .section--light .about-section-head__lead {
  color: var(--deep-500);
}

/* ---------- 纵向时间轴 ---------- */
.page-about .about-timeline {
  padding-top: clamp(44px, 6vw, 76px);
}

.page-about .about-track {
  list-style: none;
  margin: clamp(30px, 4.4vw, 52px) 0 0;
  padding: 0;
  position: relative;
}

.page-about .about-track::before {
  content: "";
  position: absolute;
  top: 10px;
  bottom: 26px;
  left: 7px;
  width: var(--pa-track-w);
  border-radius: var(--r-pill);
  background: linear-gradient(180deg, var(--green-600) 0%, var(--deep-500) 58%, rgba(20, 64, 95, 0) 100%);
}

.page-about .about-track__node {
  position: relative;
  padding: 0 0 clamp(28px, 3.8vw, 44px) 42px;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 8px;
}

.page-about .about-track__node::before {
  content: "";
  position: absolute;
  left: 0;
  top: 6px;
  width: var(--pa-node);
  height: var(--pa-node);
  border-radius: 50%;
  background: var(--green-600);
  box-shadow: 0 0 0 4px rgba(31, 163, 122, 0.16);
  transition: box-shadow var(--t-base), background var(--t-base);
}

.page-about .about-track__node:has(.tag--amber)::before {
  background: var(--amber-500);
  box-shadow: 0 0 0 4px rgba(232, 163, 61, 0.18);
}

.page-about .about-track__node:hover::before,
.page-about .about-track__node:focus-within::before {
  box-shadow: 0 0 0 7px rgba(31, 163, 122, 0.22);
}

.page-about .about-track__node:has(.tag--amber):hover::before,
.page-about .about-track__node:has(.tag--amber):focus-within::before {
  box-shadow: 0 0 0 7px rgba(232, 163, 61, 0.24);
}

.page-about .about-track__when {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-wrap: wrap;
}

.page-about .about-track__when .mono {
  font-size: clamp(24px, 3.2vw, 34px);
  line-height: 1;
  color: var(--white-100);
}

.page-about .about-track__body .h3 {
  margin: 0 0 8px;
}

.page-about .about-track__body p {
  margin: 0;
  color: var(--text-soft);
  font-size: 16px;
  line-height: 1.75;
}

.page-about .about-track__body p + .about-track__more {
  margin-top: 0;
}

.page-about .about-track__more {
  overflow: hidden;
  max-height: 0;
  opacity: 0;
  transition: max-height var(--t-base), opacity var(--t-base), margin-top var(--t-base);
}

.page-about .about-track__node:hover .about-track__more,
.page-about .about-track__node:focus-within .about-track__more {
  max-height: 260px;
  opacity: 1;
  margin-top: 10px;
}

/* ---------- 团队与协作生态 ---------- */
.page-about .about-team {
  padding-top: clamp(44px, 6vw, 76px);
  padding-bottom: clamp(44px, 6vw, 76px);
  border-radius: clamp(24px, 3vw, 36px);
}

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

.page-about .about-graph__center {
  border-radius: var(--r-lg);
  padding: clamp(22px, 3vw, 32px);
  background: linear-gradient(152deg, rgba(31, 163, 122, 0.22) 0%, rgba(7, 26, 43, 0.34) 100%);
  border: 1px solid rgba(95, 211, 168, 0.32);
}

.page-about .about-graph__center .mono {
  font-size: clamp(20px, 2.4vw, 27px);
  color: var(--green-400);
  letter-spacing: 0.02em;
}

.page-about .about-graph__center p {
  margin: 10px 0 0;
  font-size: 15px;
  line-height: 1.75;
  color: var(--text-soft);
}

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

.page-about .about-graph__leaf {
  position: relative;
  padding: 18px 18px 18px 24px;
  border-radius: var(--r-md);
  background: var(--deep-700);
  border: 1px solid var(--deep-500);
  transition: transform var(--t-base), border-color var(--t-base), box-shadow var(--t-base);
}

.page-about .about-graph__leaf::before {
  content: "";
  position: absolute;
  left: 0;
  top: 18px;
  bottom: 18px;
  width: 3px;
  border-radius: var(--r-pill);
  background: var(--green-600);
}

.page-about .about-graph__leaf--amber::before {
  background: var(--amber-500);
}

.page-about .about-graph__leaf:hover,
.page-about .about-graph__leaf:focus-visible {
  transform: translateY(-2px);
  border-color: rgba(95, 211, 168, 0.5);
  box-shadow: 0 14px 32px rgba(4, 16, 27, 0.42);
}

.page-about .about-graph__leaf:focus-visible {
  outline: 2px solid var(--green-400);
  outline-offset: 3px;
}

.page-about .about-graph__leaf .mono {
  display: block;
  font-size: 14px;
  letter-spacing: 0.02em;
  color: var(--green-400);
}

.page-about .about-graph__leaf--amber .mono {
  color: var(--amber-500);
}

.page-about .about-graph__leaf p {
  margin: 8px 0 0;
  font-size: 14px;
  line-height: 1.7;
  color: var(--text-soft);
}

.page-about .about-team__photo {
  margin-top: clamp(26px, 3.6vw, 40px);
}

/* ---------- 入库流程 ---------- */
.page-about .about-steps {
  list-style: none;
  margin: clamp(22px, 3vw, 32px) 0 0;
  padding: 0;
  display: grid;
  gap: 14px;
}

.page-about .about-steps li {
  position: relative;
  padding: 20px 20px 20px 22px;
  border-radius: var(--r-md);
  background: var(--deep-700);
  border: 1px solid var(--deep-500);
  transition: border-color var(--t-base), transform var(--t-base);
}

.page-about .about-steps li:hover {
  transform: translateY(-2px);
  border-color: rgba(95, 211, 168, 0.42);
}

.page-about .about-steps .mono {
  display: block;
  margin-bottom: 10px;
  font-size: 13px;
  letter-spacing: 0.16em;
  color: var(--green-400);
}

.page-about .about-steps .h3 {
  margin: 0 0 6px;
  font-size: 18px;
}

.page-about .about-steps p {
  margin: 0;
  font-size: 15px;
  line-height: 1.72;
  color: var(--text-soft);
}

.page-about .about-flow__visual {
  margin-top: clamp(24px, 3.4vw, 36px);
}

/* ---------- 覆盖与节奏 ---------- */
.page-about .about-reach {
  padding-top: clamp(46px, 6vw, 78px);
  padding-bottom: clamp(46px, 6vw, 78px);
  background-image: repeating-linear-gradient(
    115deg,
    rgba(31, 163, 122, 0.05) 0px,
    rgba(31, 163, 122, 0.05) 1px,
    transparent 1px,
    transparent 26px
  );
}

.page-about .about-reach__copy {
  margin-top: clamp(12px, 1.8vw, 16px);
  font-size: 16px;
  line-height: 1.75;
}

.page-about .about-reach__grid {
  display: grid;
  gap: 14px;
}

.page-about .about-reach__cell {
  padding: 22px 20px;
  border-radius: var(--r-md);
  background: #ffffff;
  border: 1px solid rgba(20, 64, 95, 0.12);
  box-shadow: 0 2px 0 rgba(20, 64, 95, 0.05);
}

.page-about .about-reach__cell--amber {
  background: var(--amber-200);
  border-color: rgba(232, 163, 61, 0.42);
}

.page-about .about-reach__num {
  display: block;
  font-size: clamp(30px, 4vw, 44px);
  line-height: 1.05;
  color: var(--green-800);
}

.page-about .about-reach__cell--amber .about-reach__num {
  color: #8a5310;
}

.page-about .about-reach__cell p {
  margin: 8px 0 0;
  font-size: 14px;
  line-height: 1.6;
  color: var(--deep-900);
}

/* ---------- 为什么继续 ---------- */
.page-about .about-why {
  padding-top: clamp(46px, 6vw, 78px);
  padding-bottom: clamp(52px, 7vw, 92px);
}

.page-about .about-quote {
  margin: clamp(24px, 3.4vw, 38px) 0;
  padding: 4px 0 4px 22px;
  border-left: 3px solid var(--green-600);
}

.page-about .about-quote p {
  margin: 0;
  font-size: clamp(18px, 2.2vw, 23px);
  line-height: 1.62;
  color: var(--white-100);
  letter-spacing: 0.01em;
}

.page-about .about-why__copy {
  margin: 0 0 16px;
  font-size: 16px;
  line-height: 1.78;
  color: var(--text-soft);
}

.page-about .about-why__copy:last-of-type {
  margin-bottom: 0;
}

.page-about .about-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: clamp(24px, 3.4vw, 36px);
}

/* ---------- 响应式 ---------- */
@media (min-width: 620px) {
  .page-about .about-graph__leaves {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

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

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

@media (min-width: 760px) {
  .page-about .about-track__node {
    grid-template-columns: 150px minmax(0, 1fr);
    gap: 6px 32px;
    padding-left: 46px;
    align-items: start;
  }

  .page-about .about-track__node::before {
    left: 1px;
  }

  .page-about .about-track::before {
    left: 8px;
  }

  .page-about .about-track__when {
    flex-direction: column;
    align-items: flex-start;
    gap: 8px;
  }
}

@media (min-width: 860px) {
  .page-about .about-graph {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, 2fr);
    align-items: stretch;
  }

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

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

@media (min-width: 1080px) {
  .page-about .about-track__node {
    grid-template-columns: 176px minmax(0, 1fr);
    gap: 8px 40px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-track__more,
  .page-about .about-graph__leaf,
  .page-about .about-steps li {
    transition: none;
  }
}
<<<END>>>