.page-about {
  --about-rule: rgba(29, 29, 27, .14);
  --about-rail: 168px;
  background-color: var(--mist);
  background-image: repeating-linear-gradient(180deg, rgba(29, 29, 27, .04) 0 1px, transparent 1px 30px);
  color: var(--ink);
  font-family: var(--font-body);
  overflow-x: clip;
}

.page-about h1,
.page-about h2,
.page-about h3 {
  font-family: var(--font-display);
  font-weight: 800;
  letter-spacing: -.02em;
  line-height: 1.18;
  margin: 0;
  text-wrap: balance;
}

.page-about p {
  margin: 0 0 1em;
  font-size: 1rem;
  line-height: 1.82;
  color: rgba(29, 29, 27, .84);
}

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

/* 面包屑 */
.page-about .crumbs {
  padding-top: 6px;
  margin-bottom: 14px;
  font-size: 12.5px;
}

/* 首屏框景 */
.page-about .about-hero {
  padding-block: 0 10px;
}

.page-about .about-hero__frame {
  position: relative;
  overflow: hidden;
  border: 1px solid var(--line-strong);
  border-radius: var(--r);
  background: rgba(255, 255, 255, .6);
}

.page-about .about-hero__frame::before {
  content: "";
  position: absolute;
  left: 0;
  bottom: 0;
  width: 64px;
  height: 64px;
  border-left: 3px solid var(--ochre);
  border-bottom: 3px solid var(--ochre);
  pointer-events: none;
}

.page-about .about-hero__frame::after {
  content: "";
  position: absolute;
  right: 0;
  top: 0;
  width: 78px;
  height: 78px;
  border-right: 2px solid var(--lake);
  border-top: 2px solid var(--lake);
  opacity: .5;
  pointer-events: none;
}

.page-about .about-hero__bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 9px 14px;
  border-bottom: 1px solid var(--line);
  background: var(--paper);
  font-size: 10.5px;
  letter-spacing: .14em;
  color: rgba(29, 29, 27, .66);
}

.page-about .about-hero__grid {
  display: grid;
  gap: 22px;
  padding: 24px 16px 22px;
}

.page-about .about-hero h1 {
  margin-top: 10px;
  font-size: clamp(2.05rem, 6.2vw, 3.8rem);
  color: var(--deep);
}

.page-about .about-hero__lede {
  margin-top: 16px;
  max-width: 48ch;
  font-size: 1rem;
  line-height: 1.84;
  color: rgba(29, 29, 27, .8);
}

.page-about .about-hero__panel {
  align-self: start;
  padding: 14px;
  border: 1px solid var(--line);
  border-left: 3px solid var(--lake);
  background: rgba(255, 255, 255, .68);
}

.page-about .about-hero__panel-title {
  margin: 0;
  font-size: 10.5px;
  letter-spacing: .16em;
  color: var(--lake);
}

.page-about .about-hero__stats {
  list-style: none;
  margin: 12px 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--line);
}

.page-about .about-hero__stats li {
  background: var(--mist);
  padding: 10px 9px;
}

.page-about .stat-num {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(1.3rem, 3.6vw, 1.75rem);
  font-weight: 600;
  line-height: 1.1;
  color: var(--ochre);
}

.page-about .stat-label {
  display: block;
  margin-top: 5px;
  font-size: 11.5px;
  line-height: 1.4;
  color: rgba(29, 29, 27, .64);
}

/* 主结构：刻度栏 + 章节 */
.page-about .journey {
  display: grid;
  gap: 26px;
  padding: 42px 0 56px;
}

.page-about .era-rail__title {
  margin: 0 0 10px;
  font-family: var(--font-mono);
  font-size: 10.5px;
  letter-spacing: .2em;
  color: rgba(29, 29, 27, .48);
}

.page-about .era-rail__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}

.page-about .era-rail__link {
  display: inline-flex;
  align-items: baseline;
  gap: 7px;
  padding: 5px 9px;
  border: 1px solid var(--line);
  font-size: 12px;
  color: rgba(29, 29, 27, .6);
  text-decoration: none;
  transition: color .18s var(--ease), border-color .18s var(--ease), background .18s var(--ease);
}

.page-about .era-rail__year {
  font-family: var(--font-mono);
  font-size: 11.5px;
}

.page-about .era-rail__link:hover {
  color: var(--lake);
  border-color: var(--lake-soft);
}

.page-about .era-rail__link[aria-current="true"] {
  color: var(--ochre);
  border-color: var(--ochre);
  background: rgba(168, 68, 42, .07);
}

/* 章节 */
.page-about .epoch {
  padding: 28px 0 34px;
  border-top: 1px solid var(--about-rule);
}

.page-about .epoch:first-child {
  border-top: 0;
  padding-top: 0;
}

.page-about .epoch__head {
  display: grid;
  grid-template-columns: auto 1fr;
  align-items: center;
  gap: 6px 10px;
}

.page-about .epoch__num {
  justify-self: start;
  padding: 1px 6px;
  border: 1px solid currentColor;
  font-size: 11px;
  letter-spacing: .1em;
  color: var(--ochre);
}

.page-about .epoch__when {
  font-size: 11.5px;
  letter-spacing: .06em;
  color: var(--lake);
}

.page-about .epoch__title {
  grid-column: 1 / -1;
  margin-top: 8px;
  font-size: clamp(1.36rem, 3.8vw, 1.95rem);
  color: var(--deep);
}

.page-about .epoch__intro {
  margin-top: 14px;
  max-width: 60ch;
}

.page-about .epoch__after {
  margin-top: 18px;
  max-width: 60ch;
  font-size: .95rem;
  color: rgba(29, 29, 27, .72);
}

.page-about .epoch__body {
  display: grid;
  gap: 22px;
  margin-top: 18px;
}

.page-about .epoch__body p {
  max-width: 60ch;
}

/* 批注 */
.page-about .note {
  margin-top: 16px;
  padding: 12px 14px;
  border-left: 2px solid var(--ochre);
  background: rgba(231, 225, 211, .66);
  font-size: .9rem;
  line-height: 1.75;
  color: rgba(29, 29, 27, .76);
}

.page-about .note__label {
  display: block;
  margin-bottom: 6px;
  font-family: var(--font-mono);
  font-size: 10.5px;
  letter-spacing: .16em;
  color: var(--ochre-deep);
}

/* 图片 */
.page-about .media {
  margin: 0;
}

.page-about .media__img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
  border: 1px solid var(--line-strong);
  background: var(--paper);
}

.page-about .media__cap {
  margin-top: 8px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  line-height: 1.6;
  color: rgba(29, 29, 27, .58);
}

.page-about .roadmap-figure {
  margin-top: 26px;
  max-width: 420px;
}

/* 横向版本时间轴 */
.page-about .vtrack {
  list-style: none;
  position: relative;
  display: flex;
  gap: 14px;
  margin: 26px 0 0;
  padding: 22px 0 12px;
  overflow-x: auto;
  scrollbar-width: thin;
}

.page-about .vtrack::before {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  top: 12px;
  height: 1px;
  background: var(--line-strong);
}

.page-about .vtrack__item {
  position: relative;
  flex: 1 1 190px;
  min-width: 178px;
  padding: 16px 14px 12px;
  border: 1px solid var(--line);
  background: rgba(255, 255, 255, .56);
}

.page-about .vtrack__item::before {
  content: "";
  position: absolute;
  left: 14px;
  top: -10px;
  width: 9px;
  height: 9px;
  border: 2px solid var(--mist);
  border-radius: 50%;
  background: var(--lake);
}

.page-about .vtrack__item:nth-child(2)::before { background: var(--tea); }
.page-about .vtrack__item:nth-child(3)::before { background: var(--ochre); }
.page-about .vtrack__item:nth-child(4)::before { background: var(--indigo); }

.page-about .vtrack__title {
  margin: 10px 0 8px;
  font-size: .98rem;
  color: var(--deep);
}

.page-about .vtrack__item p {
  font-size: .87rem;
  line-height: 1.7;
  color: rgba(29, 29, 27, .74);
}

/* 团队分工 */
.page-about .team-map {
  margin-top: 20px;
  display: grid;
  gap: 16px;
}

.page-about .team-map__core {
  display: flex;
  align-items: baseline;
  gap: 12px;
  margin: 0;
  padding: 12px 14px;
  border-left: 3px solid var(--lake);
  background: rgba(31, 110, 122, .08);
  font-size: .92rem;
}

.page-about .team-map__core b {
  font-family: var(--font-mono);
  font-size: 1.45rem;
  font-weight: 600;
  color: var(--lake);
}

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

.page-about .team-node {
  padding: 14px;
  border: 1px solid var(--line);
  background: rgba(255, 255, 255, .62);
  transition: border-color .2s var(--ease), background .2s var(--ease), transform .2s var(--ease);
}

.page-about .team-node:hover,
.page-about .team-node:focus-visible {
  border-color: var(--ochre);
  background: rgba(255, 255, 255, .92);
  transform: translateY(-2px);
  outline: none;
}

.page-about .team-node__head {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 10px;
}

.page-about .team-node__name {
  font-weight: 700;
  font-size: .96rem;
  line-height: 1.4;
  color: var(--deep);
}

.page-about .team-node__count {
  flex: 0 0 auto;
  padding: 1px 6px;
  font-size: 11px;
  color: var(--tea);
  background: rgba(47, 75, 58, .1);
}

.page-about .team-node__desc {
  margin: 8px 0 0;
  font-size: .875rem;
  line-height: 1.7;
  color: rgba(29, 29, 27, .72);
}

/* 服务版图 */
.page-about .reach {
  position: relative;
  overflow: hidden;
  margin-top: 18px;
  padding: 28px 20px;
  border-radius: var(--r);
  background: var(--deep);
}

.page-about .reach__bg {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: .34;
}

.page-about .reach::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(155deg, rgba(18, 63, 71, .92), rgba(18, 63, 71, .72));
  pointer-events: none;
}

.page-about .reach > *:not(.reach__bg) {
  position: relative;
  z-index: 1;
}

.page-about .reach__lede {
  margin: 0;
  max-width: 58ch;
  font-size: .97rem;
  line-height: 1.85;
  color: rgba(244, 241, 234, .86);
}

.page-about .reach__stats {
  list-style: none;
  margin: 22px 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 16px 18px;
}

.page-about .reach__stat b {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(1.4rem, 4.4vw, 2rem);
  font-weight: 600;
  line-height: 1.1;
  color: var(--lake-soft);
}

.page-about .reach__stat span {
  display: block;
  margin-top: 4px;
  font-size: 12px;
  color: rgba(244, 241, 234, .7);
}

/* 合作生态 */
.page-about .eco {
  list-style: none;
  margin: 18px 0 0;
  padding: 0;
  display: grid;
  gap: 10px;
}

.page-about .eco__item {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  padding: 13px 15px;
  border-left: 3px solid var(--tea);
  background: var(--paper);
}

.page-about .eco__item:nth-child(2n) {
  border-left-color: var(--lake);
}

.page-about .eco__year {
  flex: 0 0 58px;
  font-size: 11px;
  letter-spacing: .04em;
  color: var(--wine);
  padding-top: 2px;
}

.page-about .eco__text {
  font-size: .92rem;
  line-height: 1.7;
  color: rgba(29, 29, 27, .82);
}

/* 结尾入口 */
.page-about .nextstep {
  margin-top: 10px;
  padding: 28px 20px 26px;
  border: 1px solid var(--line-strong);
  background:
    linear-gradient(180deg, rgba(255, 255, 255, .74), rgba(255, 255, 255, .48)),
    repeating-linear-gradient(135deg, rgba(168, 68, 42, .07) 0 8px, transparent 8px 16px);
}

.page-about .nextstep p {
  margin-top: 14px;
  max-width: 58ch;
}

.page-about .nextstep__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 18px;
}

/* 平板与桌面 */
@media (min-width: 680px) {
  .page-about .team-map__nodes {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

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

@media (min-width: 760px) {
  .page-about .about-hero__grid {
    padding: 34px 28px 28px;
  }

  .page-about .reach {
    padding: 34px 30px;
  }

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

  .page-about .nextstep {
    padding: 34px 30px 30px;
  }
}

@media (min-width: 900px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 1.45fr) minmax(0, .85fr);
    gap: 36px;
    padding: 40px 36px 32px;
  }

  .page-about .epoch__body--split {
    grid-template-columns: minmax(0, 1fr) minmax(0, .72fr);
    align-items: start;
    gap: 32px;
  }

  .page-about .roadmap-figure {
    margin-left: auto;
  }
}

@media (min-width: 980px) {
  .page-about .journey {
    grid-template-columns: var(--about-rail) minmax(0, 1fr);
    gap: 44px;
    padding-top: 54px;
  }

  .page-about .era-rail {
    position: sticky;
    top: calc(var(--header-size) + 20px);
    align-self: start;
  }

  .page-about .era-rail__list {
    display: block;
  }

  .page-about .era-rail__list li + li {
    margin-top: 2px;
  }

  .page-about .era-rail__link {
    width: 100%;
    padding: 7px 0 7px 12px;
    border: 0;
    border-left: 2px solid var(--line);
  }

  .page-about .era-rail__link:hover {
    border-color: var(--lake-soft);
  }

  .page-about .era-rail__link[aria-current="true"] {
    border-color: var(--ochre);
    background: rgba(168, 68, 42, .06);
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .team-node {
    transition: none;
  }

  .page-about .team-node:hover,
  .page-about .team-node:focus-visible {
    transform: none;
  }
}