.page-about {
  --about-axis-w: 104px;
  font-family: var(--font-body);
  color: var(--ink);
  background-color: var(--paper);
  padding-bottom: 64px;
  overflow-x: hidden;
}

.page-about h1,
.page-about h2,
.page-about h3 {
  font-family: var(--font-head);
  font-weight: 700;
  letter-spacing: -0.5px;
  color: var(--ink);
}

.page-about p:not([class]) {
  margin: 0 0 18px;
  font-size: 16px;
  line-height: 1.85;
  color: var(--ink);
}

/* ---------- 面包屑 ---------- */
.page-about .about-crumb {
  padding: 20px 0 2px;
  font-size: 13px;
  color: var(--stone);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  display: grid;
  gap: 30px;
  padding: 12px 0 44px;
}

.page-about .about-hero__body h1 {
  font-size: 29px;
  line-height: 1.32;
  margin: 16px 0 18px;
}

.page-about .about-hero__figure {
  margin: 0;
  padding: 10px 10px 0;
  background-color: var(--paper-white);
  border: var(--line);
  box-shadow: var(--shadow-paper);
}

.page-about .about-hero__figure img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
  aspect-ratio: 10 / 7;
}

.page-about .about-hero__figure figcaption {
  padding: 10px 4px 12px;
  font-size: 13px;
  line-height: 1.7;
  color: var(--stone);
}

/* ---------- 章节头 ---------- */
.page-about .about-head {
  display: flex;
  align-items: baseline;
  gap: 12px;
  margin-bottom: 16px;
}

.page-about .about-head__index {
  flex: 0 0 auto;
  font-size: 13px;
  letter-spacing: 1px;
  color: var(--maple);
}

.page-about .about-head__index::before {
  content: "";
  display: inline-block;
  width: 7px;
  height: 7px;
  margin-right: 8px;
  background-color: var(--maple);
  vertical-align: middle;
}

.page-about .about-head h2 {
  margin: 0;
  font-size: 22px;
  line-height: 1.4;
}

/* ---------- 发展节点 ---------- */
.page-about .about-timeline {
  border-top: 1px solid var(--ink);
  padding: 40px 0 12px;
}

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

.page-about .about-axis__kicker {
  margin: 0 0 12px;
  font-family: var(--font-head);
  font-size: 12px;
  letter-spacing: 2px;
  color: var(--slate);
}

.page-about .about-axis__list {
  list-style: none;
  display: flex;
  gap: 6px;
  margin: 0;
  padding: 0 0 4px;
  overflow-x: auto;
  scrollbar-width: none;
}

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

.page-about .about-axis__link {
  display: inline-flex;
  align-items: baseline;
  gap: 7px;
  padding: 7px 11px;
  border: 1px solid var(--mist);
  border-radius: var(--radius-tag);
  background-color: var(--paper-white);
  color: var(--slate);
  font-family: var(--font-num);
  font-size: 14px;
  text-decoration: none;
  white-space: nowrap;
  transition: color 180ms ease-out, border-color 180ms ease-out;
}

.page-about .about-axis__link:hover,
.page-about .about-axis__link:focus-visible {
  color: var(--maple);
  border-color: var(--maple);
  outline: none;
}

.page-about .about-axis__link .num {
  font-weight: 600;
}

.page-about .about-node {
  position: relative;
  margin: 0 0 26px;
  padding-bottom: 26px;
  border-bottom: 1px solid rgba(169, 187, 201, 0.8);
  scroll-margin-top: calc(var(--topbar-h) + 20px);
}

.page-about .about-node--last {
  margin-bottom: 8px;
  padding-bottom: 6px;
  border-bottom: 0;
}

.page-about .about-node__year {
  display: inline-flex;
  align-items: baseline;
  gap: 9px;
  margin-bottom: 6px;
}

.page-about .about-node__year .num {
  font-size: 26px;
  font-weight: 600;
  line-height: 1;
  letter-spacing: -0.5px;
  color: var(--maple);
}

.page-about .about-node__label {
  padding: 2px 8px;
  border: 1px solid var(--mist);
  background-color: var(--paper-white);
  font-family: var(--font-head);
  font-size: 12px;
  color: var(--stone);
}

.page-about .about-node h3 {
  margin: 8px 0 10px;
  font-size: 19px;
  line-height: 1.5;
}

.page-about .about-figure {
  margin: 4px 0 28px;
  padding: 8px 8px 0;
  background-color: var(--paper-white);
  border: var(--line);
  box-shadow: var(--shadow-paper);
}

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

.page-about .about-figure figcaption {
  padding: 10px 4px 12px;
  font-size: 13px;
  line-height: 1.7;
  color: var(--stone);
}

/* ---------- 三条原则 ---------- */
.page-about .about-principles {
  border-top: 1px solid var(--ink);
  padding: 40px 0 16px;
}

.page-about .about-rules {
  display: grid;
  gap: 0;
  margin-top: 24px;
  border-top: 1px solid var(--mist);
}

.page-about .about-rule {
  display: grid;
  grid-template-columns: 1fr;
  gap: 8px;
  padding: 24px 0;
  border-bottom: 1px solid var(--mist);
  scroll-margin-top: calc(var(--topbar-h) + 20px);
}

.page-about .about-rule__num {
  font-size: 34px;
  font-weight: 600;
  line-height: 1;
  letter-spacing: -1px;
  color: var(--wood);
}

.page-about .about-rule h3 {
  margin: 10px 0 10px;
  font-size: 19px;
  line-height: 1.5;
}

.page-about .about-rule__more {
  margin-top: 8px;
  padding: 2px 0 2px 14px;
  border-left: 3px solid var(--wood);
  background-color: var(--paper-white);
}

.page-about .about-rule__more summary {
  padding: 9px 0;
  cursor: pointer;
  list-style: none;
  font-family: var(--font-head);
  font-size: 14px;
  color: var(--maple);
}

.page-about .about-rule__more summary::-webkit-details-marker {
  display: none;
}

.page-about .about-rule__more summary::after {
  content: "＋";
  margin-left: 6px;
  font-family: var(--font-num);
}

.page-about .about-rule__more[open] summary::after {
  content: "－";
}

.page-about .about-rule__example {
  margin: 0 0 12px;
  padding-right: 12px;
  font-size: 15px;
  line-height: 1.8;
  color: var(--slate);
}

/* ---------- 统计条纹 ---------- */
.page-about .about-stats {
  margin-top: 28px;
  padding: 34px 0;
  background-color: var(--wood);
  border-top: 1px solid var(--ink);
  border-bottom: 1px solid var(--ink);
}

.page-about .about-stats__list {
  list-style: none;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 26px 16px;
  margin: 0;
  padding: 0;
}

.page-about .about-stats__num {
  display: block;
  font-family: var(--font-num);
  font-size: 34px;
  font-weight: 600;
  line-height: 1;
  letter-spacing: -1px;
  color: var(--ink);
  animation: about-rise 620ms ease-out both;
}

.page-about .about-stats__unit {
  display: block;
  margin-top: 9px;
  font-family: var(--font-head);
  font-size: 13px;
  letter-spacing: 0.5px;
  color: var(--slate);
}

@keyframes about-rise {
  from {
    opacity: 0;
    transform: translateY(10px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* ---------- 编号与复核 ---------- */
.page-about .about-review {
  border-top: 1px solid var(--ink);
  padding: 40px 0 16px;
}

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

.page-about .about-steps {
  list-style: none;
  counter-reset: about-step;
  margin: 6px 0 0;
  padding: 0;
}

.page-about .about-steps li {
  counter-increment: about-step;
  position: relative;
  padding: 14px 0 14px 44px;
  border-top: 1px solid var(--mist);
  font-size: 15px;
  line-height: 1.8;
  color: var(--ink);
}

.page-about .about-steps li::before {
  content: counter(about-step);
  position: absolute;
  left: 0;
  top: 13px;
  width: 26px;
  height: 26px;
  display: flex;
  align-items: center;
  justify-content: center;
  background-color: var(--maple);
  color: var(--paper-white);
  font-family: var(--font-num);
  font-size: 13px;
  border-radius: 1px;
}

.page-about .about-quote {
  padding: 20px;
  background-color: var(--paper-white);
  border: 1px solid var(--mist);
  border-left: 4px solid var(--moss);
  box-shadow: var(--shadow-paper);
}

.page-about .about-quote__kicker {
  margin: 0 0 10px;
  font-family: var(--font-head);
  font-size: 13px;
  letter-spacing: 1px;
  color: var(--moss);
}

.page-about .about-quote__figure {
  margin: 0 0 10px;
  font-family: var(--font-num);
  font-size: 15px;
  color: var(--slate);
}

.page-about .about-quote__figure .num {
  margin-right: 6px;
  font-size: 44px;
  font-weight: 600;
  line-height: 1;
  letter-spacing: -1.5px;
  color: var(--maple);
}

.page-about .about-quote__text {
  margin: 0;
  font-size: 15px;
  line-height: 1.8;
  color: var(--slate);
}

/* ---------- 团队 ---------- */
.page-about .about-team {
  border-top: 1px solid var(--ink);
  padding: 40px 0 16px;
}

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

.page-about .about-roles {
  list-style: none;
  display: grid;
  gap: 12px;
  margin: 20px 0 20px;
  padding: 0;
}

.page-about .about-role {
  padding: 16px;
  background-color: var(--paper-white);
  border: 1px solid var(--mist);
  box-shadow: var(--shadow-paper);
  transition: transform 180ms ease-out, box-shadow 180ms ease-out;
}

.page-about .about-role:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-lift);
}

.page-about .about-role__name {
  margin: 0 0 6px;
  font-family: var(--font-head);
  font-weight: 700;
  font-size: 15px;
  color: var(--ink);
}

.page-about .about-role__text {
  margin: 0;
  font-size: 14px;
  line-height: 1.75;
  color: var(--slate);
}

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

/* ---------- 下一步 ---------- */
.page-about .about-next {
  border-top: 1px solid var(--ink);
  padding: 40px 0 16px;
}

.page-about .about-next__list {
  list-style: none;
  margin: 22px 0 0;
  padding: 0;
  border-top: 1px solid var(--mist);
}

.page-about .about-next__list li {
  position: relative;
  padding: 16px 0 16px 26px;
  border-bottom: 1px solid var(--mist);
  font-size: 15px;
  line-height: 1.85;
  color: var(--ink);
}

.page-about .about-next__list li::before {
  content: "";
  position: absolute;
  left: 3px;
  top: 25px;
  width: 8px;
  height: 8px;
  background-color: var(--maple);
}

/* ---------- 收尾 ---------- */
.page-about .about-cta {
  border-top: 1px solid var(--ink);
  padding: 40px 0 8px;
}

.page-about .about-cta h2 {
  margin: 0 0 12px;
  font-size: 22px;
  line-height: 1.4;
}

.page-about .about-cta__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin: 18px 0 14px;
}

.page-about .about-cta__more {
  margin: 0;
  font-size: 14px;
  line-height: 1.8;
  color: var(--slate);
}

.page-about .about-cta__more a {
  color: var(--maple);
  text-decoration: underline;
  text-underline-offset: 3px;
}

/* ---------- 中等屏 ---------- */
@media (min-width: 680px) {
  .page-about .about-hero__body h1 {
    font-size: 34px;
  }

  .page-about .about-head h2 {
    font-size: 25px;
  }

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

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

  .page-about .about-stats__num {
    font-size: 40px;
  }
}

/* ---------- 桌面 ---------- */
@media (min-width: 900px) {
  .page-about .about-hero {
    grid-template-columns: minmax(0, 1.15fr) minmax(0, 0.85fr);
    gap: 48px;
    align-items: start;
    padding: 20px 0 60px;
  }

  .page-about .about-hero__body h1 {
    font-size: 42px;
    max-width: 15em;
  }

  .page-about .about-timeline__inner {
    grid-template-columns: var(--about-axis-w) minmax(0, 1fr);
    gap: 48px;
    align-items: start;
  }

  .page-about .about-axis {
    position: sticky;
    top: calc(var(--topbar-h) + 24px);
  }

  .page-about .about-axis__list {
    flex-direction: column;
    gap: 0;
    overflow: visible;
    border-left: 1px solid var(--mist);
    padding-bottom: 0;
  }

  .page-about .about-axis__link {
    margin-left: -1px;
    padding: 11px 8px;
    border: 0;
    border-left: 3px solid transparent;
    border-radius: 0;
    background-color: transparent;
    font-size: 13px;
  }

  .page-about .about-axis__link:hover,
  .page-about .about-axis__link:focus-visible {
    background-color: var(--paper-white);
    border-left-color: var(--maple);
  }

  .page-about .about-head h2 {
    font-size: 28px;
  }

  .page-about .about-rule {
    grid-template-columns: 86px minmax(0, 1fr);
    gap: 30px;
    padding: 30px 0;
  }

  .page-about .about-rule__num {
    font-size: 46px;
  }

  .page-about .about-review__grid {
    grid-template-columns: minmax(0, 1.45fr) minmax(0, 1fr);
    gap: 46px;
    align-items: start;
  }

  .page-about .about-team__grid {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, 0.95fr);
    gap: 46px;
    align-items: start;
  }

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

  .page-about .about-stats {
    padding: 44px 0;
  }

  .page-about .about-stats__num {
    font-size: 44px;
  }

  .page-about .about-next__list {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 0 28px;
    border-bottom: 0;
  }

  .page-about .about-next__list li {
    border-bottom: 0;
    border-top: 1px solid var(--mist);
    padding-top: 20px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-stats__num {
    animation: none;
  }

  .page-about .about-role {
    transition: none;
  }

  .page-about .about-role:hover {
    transform: none;
  }
}
<<<END>>>