.page-about {
  --about-node: 14px;
  overflow-wrap: break-word;
}

.page-about .about-crumbs {
  padding: 1.25rem 0 0.4rem;
  font-size: var(--fs-small);
  letter-spacing: 0.04em;
}

.page-about .about-hero {
  padding: clamp(1.4rem, 4vw, 2.6rem) 0 clamp(2rem, 5vw, 3.5rem);
}

.page-about .about-hero__grid {
  display: grid;
  gap: clamp(1.75rem, 4vw, 3rem);
}

.page-about .about-hero .eyebrow {
  --eyebrow-color: var(--lime);
}

.page-about .about-hero h1 {
  margin: 0.9rem 0 1.1rem;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: var(--fs-hero);
  line-height: 1.04;
  letter-spacing: -0.02em;
}

.page-about .about-hero__lead {
  max-width: 36em;
  margin: 0;
  font-size: var(--fs-lead);
  line-height: 1.8;
  color: var(--text);
}

.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin-top: 1.6rem;
}

.page-about .about-plate {
  padding: clamp(1.1rem, 3vw, 1.6rem);
  background: var(--panel);
  border: var(--edge);
  border-radius: 2px;
  box-shadow: var(--hard);
}

.page-about .about-plate__label {
  margin: 0;
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--muted);
}

.page-about .about-plate__ver {
  margin: 0.25rem 0 0;
  font-family: var(--font-mono);
  font-size: clamp(2.6rem, 9vw, 3.8rem);
  line-height: 1;
  letter-spacing: -0.03em;
  color: var(--cyan);
}

.page-about .about-plate__desc {
  margin: 0.7rem 0 0;
  font-size: var(--fs-small);
  line-height: 1.7;
  color: var(--muted);
}

.page-about .about-plate__stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 0.9rem 1rem;
  margin: 1.2rem 0 0;
  padding-top: 1.1rem;
  border-top: 1px solid var(--line);
}

.page-about .about-plate__stats div {
  display: flex;
  flex-direction: column;
  gap: 0.15rem;
}

.page-about .about-plate__stats dt {
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--muted);
}

.page-about .about-plate__stats dd {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 1.5rem;
  line-height: 1.1;
  color: var(--orange);
}

.page-about .about-body {
  padding-bottom: clamp(2rem, 6vw, 4rem);
}

.page-about .about-rail {
  display: none;
}

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

.page-about .about-sec {
  position: relative;
  padding: clamp(1.6rem, 4vw, 2.6rem) 0 clamp(1.9rem, 4.5vw, 3rem) 2.7rem;
  border-bottom: 1px solid var(--line);
}

.page-about .about-sec::before {
  content: "";
  position: absolute;
  left: 9px;
  top: 0;
  bottom: 0;
  width: 2px;
  background: var(--line);
}

.page-about .about-sec::after {
  content: "";
  position: absolute;
  left: 3px;
  top: calc(clamp(1.6rem, 4vw, 2.6rem) + 0.45rem);
  width: var(--about-node);
  height: var(--about-node);
  border-radius: 50%;
  background: var(--ink);
  border: 3px solid var(--accent, var(--cyan));
}

.page-about .about-sec--origin { --accent: var(--cyan); }
.page-about .about-sec--routes { --accent: var(--orange); }
.page-about .about-sec--timeline { --accent: var(--purple); }
.page-about .about-sec--team { --accent: var(--cyan); }
.page-about .about-sec--region { --accent: var(--orange); }
.page-about .about-sec--save { --accent: var(--purple); }

.page-about .about-sec__head {
  display: flex;
  align-items: baseline;
  gap: 0.7rem;
  margin-bottom: 0.95rem;
}

.page-about .about-sec__num {
  flex: none;
  font-family: var(--font-mono);
  font-size: var(--fs-small);
  letter-spacing: 0.14em;
  color: var(--accent, var(--cyan));
}

.page-about .about-sec__title {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: var(--fs-section);
  line-height: 1.2;
  letter-spacing: -0.015em;
}

.page-about .about-text {
  max-width: 38em;
}

.page-about .about-text p {
  margin: 0 0 0.95rem;
  font-size: var(--fs-body);
  line-height: 1.85;
}

.page-about .about-text p:last-child {
  margin-bottom: 0;
}

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

/* 三条动线 */
.page-about .about-routes {
  display: grid;
  gap: 0.9rem;
  margin-top: 1.5rem;
}

.page-about .about-route {
  padding: 1rem 1.1rem;
  background: var(--panel);
  border: var(--edge);
  border-left: 6px solid var(--rc, var(--cyan));
  border-radius: 2px;
  box-shadow: var(--hard-sm);
}

.page-about .about-route--cyan { --rc: var(--cyan); }
.page-about .about-route--orange { --rc: var(--orange); }
.page-about .about-route--purple { --rc: var(--purple); }

.page-about .about-route__name {
  display: block;
  margin-bottom: 0.4rem;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.02rem;
  line-height: 1.35;
}

.page-about .about-route p {
  margin: 0;
  font-size: 0.94rem;
  line-height: 1.75;
  color: var(--muted);
}

/* 图 */
.page-about .about-figure {
  margin: 1.5rem 0 0;
}

.page-about .about-figure img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
  border: var(--edge);
  border-radius: 2px;
  background: var(--raised);
}

.page-about .about-figure figcaption {
  margin-top: 0.6rem;
  font-size: var(--fs-small);
  letter-spacing: 0.05em;
  line-height: 1.6;
  color: var(--muted);
}

/* 版本时间线 */
.page-about .about-tl {
  position: relative;
  margin: 1.6rem 0 0;
  padding: 0;
  list-style: none;
}

.page-about .about-tl::before {
  content: "";
  position: absolute;
  left: 6px;
  top: 0.6rem;
  bottom: 0.6rem;
  width: 2px;
  background: var(--line);
}

.page-about .about-tl > li {
  position: relative;
  padding-left: 2rem;
  margin-bottom: 0.8rem;
}

.page-about .about-tl > li:last-child {
  margin-bottom: 0;
}

.page-about .about-tl > li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.95rem;
  width: 13px;
  height: 13px;
  border-radius: 50%;
  background: var(--ink);
  border: 3px solid var(--purple);
}

.page-about .about-tl__item {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 2px;
}

.page-about .about-tl__item[open] {
  background: var(--raised);
  border-color: var(--purple);
}

.page-about .about-tl__item summary {
  display: flex;
  align-items: center;
  gap: 0.7rem;
  padding: 0.8rem 1rem;
  cursor: pointer;
  list-style: none;
}

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

.page-about .about-tl__item summary::after {
  content: "+";
  margin-left: auto;
  font-family: var(--font-mono);
  font-size: 1.15rem;
  line-height: 1;
  color: var(--purple);
}

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

.page-about .about-tl__ver {
  font-family: var(--font-mono);
  font-size: 0.95rem;
  letter-spacing: 0.02em;
  color: var(--purple);
}

.page-about .about-tl__stage {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 0.94rem;
  line-height: 1.4;
}

.page-about .about-tl__body {
  padding: 0 1rem 1rem;
}

.page-about .about-tl__body p {
  margin: 0.35rem 0 0;
  font-size: 0.94rem;
  line-height: 1.75;
  color: var(--muted);
}

.page-about .about-tl__body ul {
  margin: 0.6rem 0 0;
  padding-left: 1.1rem;
  font-size: 0.94rem;
  line-height: 1.7;
  color: var(--muted);
}

.page-about .about-tl__body li {
  margin-bottom: 0.3rem;
}

/* 团队分工 */
.page-about .about-roles {
  display: grid;
  gap: 0.85rem;
  margin-top: 1.5rem;
}

.page-about .about-role {
  padding: 0.95rem 1rem;
  background: var(--panel);
  border: var(--edge);
  border-radius: 2px;
  box-shadow: var(--hard-sm);
}

.page-about .about-role__tag {
  display: inline-block;
  margin-bottom: 0.5rem;
  padding: 0.15rem 0.45rem;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--cyan);
  background: var(--raised);
  border: 1px solid var(--line);
  border-radius: 2px;
}

.page-about .about-role p {
  margin: 0;
  font-size: 0.93rem;
  line-height: 1.72;
  color: var(--muted);
}

/* 收藏 */
.page-about .about-save {
  margin-top: 1.4rem;
  padding: 1.1rem 1.2rem;
  background: var(--raised);
  border: var(--edge);
  border-radius: 2px;
  box-shadow: var(--hard-sm);
}

.page-about .about-save__title {
  margin: 0 0 0.6rem;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1rem;
  color: var(--lime);
}

.page-about .about-save__list {
  margin: 0;
  padding-left: 1.1rem;
  font-size: 0.95rem;
  line-height: 1.75;
  color: var(--text);
}

.page-about .about-save__list li {
  margin-bottom: 0.35rem;
}

.page-about .about-save__list li:last-child {
  margin-bottom: 0;
}

/* 收束 */
.page-about .about-cta {
  margin-top: clamp(2rem, 6vw, 3.5rem);
  padding: clamp(1.8rem, 5vw, 3rem) 0;
  background: var(--panel);
  border-top: var(--edge);
  border-bottom: var(--edge);
}

.page-about .about-cta__inner {
  display: grid;
  gap: 1.4rem;
}

.page-about .about-cta__title {
  margin: 0 0 0.6rem;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: var(--fs-section);
  line-height: 1.2;
  letter-spacing: -0.015em;
}

.page-about .about-cta__text {
  max-width: 34em;
  margin: 0;
  font-size: var(--fs-body);
  line-height: 1.8;
  color: var(--muted);
}

.page-about .about-cta__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
}

@media (min-width: 760px) {
  .page-about .about-sec {
    padding-left: 3.2rem;
  }

  .page-about .about-sec::before {
    left: 13px;
  }

  .page-about .about-sec::after {
    left: 7px;
  }

  .page-about .about-cta__inner {
    grid-template-columns: minmax(0, 1fr) auto;
    align-items: end;
  }
}

@media (min-width: 900px) {
  .page-about .about-hero__grid {
    grid-template-columns: 7fr 5fr;
    align-items: end;
  }

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

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

@media (min-width: 1040px) {
  .page-about .about-body {
    display: grid;
    grid-template-columns: 200px minmax(0, 1fr);
    gap: clamp(2rem, 4vw, 3.5rem);
    align-items: start;
  }

  .page-about .about-rail {
    display: block;
    position: sticky;
    top: 1.5rem;
    align-self: start;
    padding-top: clamp(1.6rem, 4vw, 2.6rem);
  }

  .page-about .about-rail__title {
    margin: 0 0 0.7rem;
    font-size: 11px;
    letter-spacing: 0.16em;
    color: var(--muted);
  }

  .page-about .about-rail__list {
    margin: 0;
    padding: 0;
    list-style: none;
  }

  .page-about .about-rail__list a {
    display: block;
    padding: 0.5rem 0 0.5rem 0.9rem;
    border-left: 2px solid var(--line);
    font-size: 0.88rem;
    line-height: 1.45;
    color: var(--muted);
    text-decoration: none;
    transition: color 0.2s var(--ease), border-color 0.2s var(--ease);
  }

  .page-about .about-rail__list a:hover,
  .page-about .about-rail__list a[aria-current="true"] {
    color: var(--text);
    border-left-color: var(--cyan);
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-rail__list a {
    transition: none;
  }
}
<<<END>>>