.page-about {
  background: var(--paper);
  color: var(--ink);
}

/* ============ 首屏 ============ */
.page-about .about-hero {
  position: relative;
  padding-block: clamp(26px, 4.4vw, 56px) clamp(38px, 6vw, 82px);
  border-bottom: 1px solid var(--line-strong);
  background:
    radial-gradient(115% 90% at 100% 0%, rgba(14, 111, 107, .16), transparent 60%),
    radial-gradient(90% 70% at 0% 100%, rgba(201, 162, 39, .1), transparent 58%),
    var(--paper);
}

.page-about .about-hero__inner {
  display: grid;
  gap: clamp(26px, 4vw, 52px);
}

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

.page-about .about-hero .breadcrumb {
  margin-bottom: clamp(18px, 2.6vw, 30px);
}

.page-about .about-hero__eyebrow {
  margin: 0 0 14px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .18em;
  text-transform: uppercase;
  color: var(--cinnabar);
}

.page-about .about-hero h1 {
  margin: 0 0 clamp(16px, 2.2vw, 24px);
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(34px, 7.2vw, 66px);
  line-height: 1.06;
  letter-spacing: -.02em;
  color: var(--ink);
}

.page-about .about-hero__sub {
  max-width: 48ch;
  margin: 0;
  font-size: clamp(15px, 1.6vw, 18px);
  line-height: 1.78;
  color: var(--ink);
  opacity: .84;
}

.page-about .about-hero__aside {
  display: grid;
  gap: 12px;
  align-content: start;
  min-width: 0;
}

.page-about .about-stat {
  display: grid;
  gap: 5px;
  padding: 15px 18px;
  background: var(--paper-white);
  border: 1px solid var(--line-strong);
  border-left: 4px solid var(--jade);
  color: var(--ink);
  text-decoration: none;
  transition: transform .22s var(--ease), border-color .22s var(--ease), border-left-color .22s var(--ease);
}

.page-about .about-stat:nth-child(2) {
  margin-left: clamp(0px, 3.5vw, 26px);
  border-left-color: var(--cinnabar);
}

.page-about .about-stat:nth-child(3) {
  margin-right: clamp(0px, 3.5vw, 26px);
  border-left-color: var(--gold);
}

.page-about .about-stat:hover,
.page-about .about-stat:focus-visible {
  transform: translateY(-2px);
  border-color: var(--jade);
}

.page-about .about-stat__num {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(26px, 3.6vw, 34px);
  line-height: 1.05;
  letter-spacing: -.01em;
  color: var(--jade);
}

.page-about .about-stat__num em {
  margin-left: 3px;
  font-style: normal;
  font-size: .44em;
  font-weight: 700;
  letter-spacing: .04em;
  color: var(--gray);
}

.page-about .about-stat__label {
  font-size: 13.5px;
  line-height: 1.65;
  color: var(--gray);
}

/* ============ 时间线主体 ============ */
.page-about .about-story {
  padding-block: clamp(38px, 6vw, 84px);
}

.page-about .about-story__head {
  display: grid;
  gap: 14px;
  margin-bottom: clamp(28px, 4vw, 50px);
  padding-bottom: 20px;
  border-bottom: 2px solid var(--ink);
}

.page-about .about-story__title {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(23px, 3.4vw, 36px);
  line-height: 1.16;
  letter-spacing: -.01em;
  color: var(--ink);
}

.page-about .about-story__intro {
  max-width: 54ch;
  margin: 0;
  font-size: clamp(15px, 1.6vw, 17px);
  line-height: 1.8;
  color: var(--ink);
  opacity: .82;
}

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

.page-about .about-node {
  position: relative;
  padding: 0 0 clamp(34px, 5vw, 62px) 26px;
  min-width: 0;
}

.page-about .about-node::before {
  content: "";
  position: absolute;
  top: 10px;
  bottom: 0;
  left: 4px;
  width: 2px;
  background: repeating-linear-gradient(to bottom, var(--line-strong) 0 7px, transparent 7px 14px);
}

.page-about .about-node::after {
  content: "";
  position: absolute;
  top: 5px;
  left: 0;
  width: 10px;
  height: 10px;
  background: var(--cinnabar);
  border: 1px solid var(--paper-white);
}

.page-about .about-node:last-child {
  padding-bottom: 0;
}

.page-about .about-node:last-child::before {
  display: none;
}

.page-about .about-node__index {
  display: flex;
  align-items: baseline;
  flex-wrap: wrap;
  gap: 10px;
  margin-bottom: 8px;
}

.page-about .about-node__num {
  font-family: var(--font-serif);
  font-weight: 700;
  font-size: clamp(30px, 5.4vw, 50px);
  line-height: 1;
  letter-spacing: -.02em;
  color: var(--gold);
  transition: color .22s var(--ease);
}

.page-about .about-node__year {
  padding: 3px 8px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .13em;
  color: var(--cinnabar);
  border: 1px solid rgba(217, 72, 31, .45);
  background: rgba(217, 72, 31, .05);
}

.page-about .about-node:hover .about-node__num {
  color: var(--jade);
}

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

.page-about .about-node__title {
  margin: 0 0 10px;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(19px, 2.4vw, 26px);
  line-height: 1.32;
  color: var(--ink);
}

.page-about .about-node__body p {
  max-width: 62ch;
  margin: 0 0 12px;
  font-size: clamp(15px, 1.5vw, 17px);
  line-height: 1.82;
  color: var(--ink);
}

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

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

.page-about .about-node__foot {
  margin: 14px 0 0;
  font-size: 14px;
  line-height: 1.7;
  color: var(--gray);
}

/* 折叠细节 */
.page-about .about-more {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  margin-top: 4px;
  padding: 8px 14px;
  font-family: var(--font-body);
  font-size: 14px;
  color: var(--jade);
  background: transparent;
  border: 1px solid var(--line-strong);
  border-radius: var(--radius);
  cursor: pointer;
  transition: background-color .2s var(--ease), border-color .2s var(--ease), color .2s var(--ease);
}

.page-about .about-more::after {
  content: "＋";
  font-family: var(--font-mono);
  font-size: 13px;
  line-height: 1;
}

.page-about .about-more:hover,
.page-about .about-more:focus-visible {
  border-color: var(--cinnabar);
  color: var(--cinnabar);
}

.page-about .about-more[aria-expanded="true"] {
  background: var(--jade-soft);
  border-color: var(--jade);
  color: var(--ink);
}

.page-about .about-more[aria-expanded="true"]::after {
  content: "－";
}

.page-about .about-more__panel {
  margin-top: 14px;
  padding: 12px 0 12px 16px;
  border-left: 3px solid var(--cinnabar);
  background: rgba(207, 230, 225, .42);
}

.page-about .about-more__panel[hidden] {
  display: none;
}

.page-about .about-more__panel ul {
  margin: 0;
  padding-left: 18px;
}

.page-about .about-more__panel li {
  font-size: 15px;
  line-height: 1.8;
  color: var(--ink);
  margin-bottom: 5px;
}

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

/* 规模数据 */
.page-about .about-stats {
  display: grid;
  gap: 1px;
  margin-top: 18px;
  background: var(--line-strong);
  border: 1px solid var(--line-strong);
}

.page-about .about-stats__item {
  display: grid;
  gap: 6px;
  padding: 15px 17px;
  background: var(--paper-white);
}

.page-about .about-stats__num {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(23px, 3vw, 31px);
  line-height: 1.05;
  color: var(--jade);
}

.page-about .about-stats__label {
  font-size: 13.5px;
  line-height: 1.68;
  color: var(--gray);
}

/* 图片 */
.page-about .about-figure {
  margin: clamp(16px, 2.4vw, 26px) 0 0;
}

.page-about .about-figure .figure__frame {
  padding: 8px;
  background: var(--jade-soft);
  border: 1px solid var(--line-strong);
}

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

.page-about .about-figure .figure__caption {
  margin-top: 8px;
  font-family: var(--font-mono);
  font-size: 12px;
  line-height: 1.6;
  letter-spacing: .03em;
  color: var(--gray);
}

/* 收尾节点 */
.page-about .about-node--end::before {
  background: linear-gradient(to bottom, var(--cinnabar), transparent);
}

.page-about .about-node--end .about-node__content {
  padding: clamp(20px, 3vw, 30px);
  background: var(--paper-white);
  border: 1px solid var(--line-strong);
  border-top: 4px solid var(--jade);
}

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

.page-about .about-actions .btn {
  text-decoration: none;
}

/* ============ 响应式 ============ */
@media (min-width: 640px) {
  .page-about .about-stats {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (min-width: 880px) {
  .page-about .about-hero__inner {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    align-items: end;
    column-gap: clamp(30px, 5vw, 72px);
  }

  .page-about .about-story__head {
    grid-template-columns: minmax(0, 5fr) minmax(0, 6fr);
    align-items: end;
    column-gap: clamp(28px, 4vw, 64px);
  }

  .page-about .about-node {
    display: grid;
    grid-template-columns: minmax(112px, 156px) minmax(0, 1fr);
    column-gap: clamp(22px, 3.6vw, 54px);
    padding-left: 34px;
  }

  .page-about .about-node::before {
    left: 6px;
  }

  .page-about .about-node::after {
    left: 2px;
  }

  .page-about .about-node__index {
    position: sticky;
    top: 116px;
    flex-direction: column;
    align-items: flex-start;
    gap: 8px;
    margin-bottom: 0;
  }
}

@media (min-width: 1080px) {
  .page-about .about-hero__aside {
    gap: 14px;
  }

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