.page-about {
  background: var(--cream);
  color: var(--ink);
  overflow-x: hidden;
}

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

/* ---------- 首屏 ---------- */

.page-about .about-hero {
  position: relative;
  margin-top: calc(var(--header-h) * -1);
  padding-top: calc(var(--header-h) + 26px);
  padding-bottom: 44px;
  background: var(--ink-green);
  color: var(--on-dark);
  border-bottom: var(--line);
  overflow: hidden;
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  right: -90px;
  top: -90px;
  width: 300px;
  height: 300px;
  border: 14px solid rgba(242, 181, 68, .18);
  border-radius: 50%;
  pointer-events: none;
}

.page-about .about-hero .breadcrumbs {
  position: relative;
  z-index: 1;
  margin-bottom: 26px;
  color: var(--on-dark-soft);
}

.page-about .about-hero .breadcrumbs a {
  color: var(--wheat);
}

.page-about .about-hero__grid {
  position: relative;
  z-index: 1;
  display: grid;
  gap: 34px;
}

.page-about .about-hero__eyebrow {
  margin: 0 0 14px;
  color: var(--gold);
  letter-spacing: .16em;
}

.page-about .about-hero__title {
  margin: 0 0 20px;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(2.1rem, 7.5vw, 3.6rem);
  line-height: 1.1;
  letter-spacing: .01em;
  text-shadow: 4px 4px 0 var(--red);
}

.page-about .about-hero__lead {
  margin: 0;
  max-width: 58ch;
  font-size: 1rem;
  line-height: 1.85;
  color: var(--on-dark);
}

.page-about .hero-stats {
  display: flex;
  flex-wrap: wrap;
  gap: 20px 36px;
  margin: 30px 0 0;
  padding: 20px 0 0;
  list-style: none;
  border-top: 1px solid rgba(231, 239, 233, .22);
}

.page-about .hero-stats li {
  display: grid;
  gap: 4px;
}

.page-about .hero-stats .num {
  font-family: var(--font-mono);
  font-size: clamp(1.6rem, 5vw, 2.1rem);
  font-weight: 700;
  line-height: 1;
  color: var(--gold);
}

.page-about .hero-stats .lb {
  font-size: .78rem;
  letter-spacing: .1em;
  color: var(--on-dark-soft);
}

.page-about .about-hero__figure {
  margin: 0;
  border: var(--line);
  background: var(--cream-2);
  box-shadow: var(--shadow-gold);
}

.page-about .about-hero__figure img {
  width: 100%;
  aspect-ratio: 4 / 3;
  object-fit: cover;
}

.page-about .about-hero__figure figcaption {
  padding: 10px 14px;
  font-size: .8rem;
  line-height: 1.6;
  color: var(--ink);
  background: var(--wheat);
  border-top: var(--line);
}

/* ---------- 卷轴主体 ---------- */

.page-about .about-scroll {
  padding-top: 44px;
  padding-bottom: 68px;
}

.page-about .about-rail {
  margin-bottom: 36px;
  padding-bottom: 18px;
  border-bottom: var(--line-soft);
}

.page-about .about-rail__group + .about-rail__group {
  margin-top: 18px;
}

.page-about .about-rail__title {
  margin: 0 0 10px;
  font-family: var(--font-mono);
  font-size: .72rem;
  letter-spacing: .18em;
  color: var(--copper);
}

.page-about .about-rail__list {
  display: flex;
  gap: 8px;
  margin: 0;
  padding: 0 0 6px;
  list-style: none;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  scrollbar-width: thin;
}

.page-about .about-rail__list li {
  flex: 0 0 auto;
}

.page-about .about-rail__list a {
  display: inline-flex;
  align-items: baseline;
  gap: 8px;
  padding: 7px 12px;
  font-size: .82rem;
  text-decoration: none;
  color: var(--ink);
  background: var(--paper);
  border: 2px solid transparent;
  border-radius: var(--radius);
  white-space: nowrap;
  transition: border-color var(--t-fast), background var(--t-fast), color var(--t-fast);
}

.page-about .about-rail__list a .mono {
  font-family: var(--font-mono);
  font-weight: 700;
  color: var(--red);
}

.page-about .about-rail__list a:hover,
.page-about .about-rail__list a:focus-visible {
  background: var(--wheat);
  border-color: var(--ink);
  outline: none;
}

/* ---------- 章节 ---------- */

.page-about .about-chapter {
  padding-bottom: 46px;
}

.page-about .about-chapter + .about-chapter {
  border-top: var(--line);
  padding-top: 42px;
}

.page-about .about-chapter__title {
  margin: 0 0 16px;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(1.5rem, 5vw, 2.25rem);
  line-height: 1.2;
  letter-spacing: .01em;
  text-shadow: 3px 3px 0 var(--gold);
}

.page-about .about-chapter__lead {
  margin: 0 0 16px;
  font-size: 1.02rem;
  line-height: 1.85;
  color: var(--ink);
}

.page-about .about-chapter p {
  max-width: 66ch;
  line-height: 1.85;
}

.page-about .about-chapter a {
  color: var(--red-deep);
  text-decoration: underline;
  text-decoration-thickness: 2px;
  text-underline-offset: 3px;
}

.page-about .about-chapter a:hover,
.page-about .about-chapter a:focus-visible {
  color: var(--red);
  background: var(--wheat);
  outline: none;
}

.page-about .about-chapter__note {
  margin: 22px 0 0;
  padding: 14px 16px;
  font-size: .9rem;
  line-height: 1.8;
  color: var(--copper);
  background: var(--paper);
  border-left: 6px solid var(--gold);
}

/* ---------- 时间线 ---------- */

.page-about .timeline {
  margin: 26px 0 0;
  border-top: var(--line);
}

.page-about .node {
  border-bottom: var(--line-soft);
  scroll-margin-top: calc(var(--header-h) + 20px);
}

.page-about .node > summary {
  position: relative;
  display: flex;
  align-items: baseline;
  gap: 16px;
  padding: 18px 38px 18px 6px;
  cursor: pointer;
  list-style: none;
  transition: background var(--t-fast);
}

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

.page-about .node > summary::after {
  content: "+";
  position: absolute;
  right: 8px;
  top: 50%;
  transform: translateY(-50%);
  font-family: var(--font-mono);
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--red);
}

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

.page-about .node > summary:hover,
.page-about .node > summary:focus-visible {
  background: var(--paper);
  outline: none;
}

.page-about .node[open] > summary {
  background: var(--wheat);
}

.page-about .node__year {
  font-family: var(--font-mono);
  font-size: 1.35rem;
  font-weight: 700;
  line-height: 1;
  color: var(--red);
  min-width: 3.6em;
}

.page-about .node__label {
  font-family: var(--font-display);
  font-size: 1.05rem;
  font-weight: 700;
}

.page-about .node__body {
  margin: 0;
  padding: 4px 12px 22px 6px;
  font-size: .95rem;
  line-height: 1.85;
  color: var(--ink);
}

/* ---------- 团队 ---------- */

.page-about .crew {
  margin: 26px 0 0;
  padding: 0;
  list-style: none;
  border-top: var(--line);
}

.page-about .crew > li {
  display: grid;
  gap: 6px;
  padding: 22px 0;
  border-bottom: var(--line-soft);
}

.page-about .crew__role {
  font-family: var(--font-display);
  font-size: 1.15rem;
  font-weight: 700;
}

.page-about .crew__num {
  font-family: var(--font-mono);
  font-size: 1.55rem;
  font-weight: 700;
  line-height: 1;
  color: var(--red);
}

.page-about .crew__num span {
  margin-left: 3px;
  font-size: .72rem;
  font-weight: 500;
  color: var(--copper);
}

.page-about .crew__desc {
  margin: 0;
  font-size: .95rem;
  line-height: 1.8;
}

/* ---------- 图片 ---------- */

.page-about .about-figure {
  margin: 28px 0 0;
  border: var(--line);
  background: var(--paper);
  box-shadow: var(--shadow-hard);
}

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

.page-about .about-figure figcaption {
  padding: 10px 14px;
  font-size: .78rem;
  line-height: 1.6;
  color: var(--cream);
  background: var(--ink-green);
  border-top: var(--line);
}

/* ---------- 纹样块 ---------- */

.page-about .pattern-block {
  margin: 26px 0 0;
  padding: 26px 22px;
  background: var(--ink-green-2);
  color: var(--on-dark);
  border: var(--line);
  box-shadow: var(--shadow-gold);
}

.page-about .pattern-block p {
  margin: 0;
  max-width: 62ch;
  font-size: .96rem;
  line-height: 1.9;
}

/* ---------- 原则 ---------- */

.page-about .pledge {
  margin: 26px 0 0;
  padding: 0;
  list-style: none;
  counter-reset: pledge;
}

.page-about .pledge > li {
  position: relative;
  counter-increment: pledge;
  padding: 20px 0 20px 64px;
  border-bottom: var(--line-soft);
}

.page-about .pledge > li:first-child {
  border-top: var(--line);
}

.page-about .pledge > li::before {
  content: counter(pledge, decimal-leading-zero);
  position: absolute;
  left: 0;
  top: 20px;
  font-family: var(--font-mono);
  font-size: 1.5rem;
  font-weight: 700;
  line-height: 1;
  color: var(--gold);
  text-shadow: 2px 2px 0 var(--ink);
}

.page-about .pledge__title {
  margin: 0 0 6px;
  font-family: var(--font-display);
  font-size: 1.05rem;
  font-weight: 700;
}

.page-about .pledge p {
  margin: 0;
  font-size: .95rem;
  line-height: 1.8;
  color: var(--ink);
}

/* ---------- 收尾 ---------- */

.page-about .about-cta {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 18px;
  margin-top: 34px;
  padding: 26px 22px;
  background: var(--cream-2);
  border: var(--line);
  box-shadow: var(--shadow-red);
}

.page-about .about-cta__text {
  margin: 0;
  font-size: .96rem;
  line-height: 1.85;
}

.page-about .about-cta .btn {
  align-self: flex-start;
}

/* ---------- 桌面端 ---------- */

@media (min-width: 900px) {
  .page-about .about-hero {
    padding-bottom: 60px;
  }

  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 1.12fr) minmax(0, .88fr);
    gap: 48px;
    align-items: end;
  }

  .page-about .about-hero__lead {
    font-size: 1.06rem;
  }

  .page-about .about-scroll {
    display: grid;
    grid-template-columns: 244px minmax(0, 1fr);
    gap: 64px;
    padding-top: 58px;
    padding-bottom: 86px;
  }

  .page-about .about-rail {
    position: sticky;
    top: calc(var(--header-h) + 28px);
    align-self: start;
    margin-bottom: 0;
    padding-bottom: 0;
    border-bottom: 0;
    border-left: var(--line);
    padding-left: 18px;
  }

  .page-about .about-rail__list {
    display: block;
    overflow: visible;
    padding-bottom: 0;
  }

  .page-about .about-rail__list li + li {
    margin-top: 6px;
  }

  .page-about .about-rail__list a {
    display: flex;
    width: 100%;
    padding: 8px 10px;
    font-size: .85rem;
    background: transparent;
    border-width: 2px;
  }

  .page-about .about-chapter {
    padding-bottom: 58px;
  }

  .page-about .about-chapter + .about-chapter {
    padding-top: 52px;
  }

  .page-about .crew > li {
    grid-template-columns: 158px 92px minmax(0, 1fr);
    align-items: baseline;
    gap: 22px;
  }

  .page-about .about-cta {
    flex-direction: row;
    align-items: center;
    justify-content: space-between;
    gap: 32px;
    padding: 30px 28px;
  }

  .page-about .about-cta__text {
    max-width: 54ch;
  }
}

@media (min-width: 1180px) {
  .page-about .about-hero__title {
    font-size: 3.5rem;
  }

  .page-about .about-scroll {
    grid-template-columns: 264px minmax(0, 1fr);
    gap: 78px;
  }
}

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