.page-about {
  --ab-rail: 208px;
  --ab-ink-line: rgba(201, 161, 91, .22);
  display: block;
  background: var(--ink);
  color: var(--text);
}

/* ——— 首屏 ——— */
.page-about .about-hero {
  position: relative;
  isolation: isolate;
  padding-block: clamp(1.6rem, 5vw, 3.8rem) clamp(1.3rem, 3.4vw, 2.4rem);
  border-bottom: 1px solid var(--line);
  overflow: hidden;
}
.page-about .about-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  z-index: 0;
  pointer-events: none;
  background-image:
    repeating-linear-gradient(90deg, var(--ab-ink-line) 0 1px, transparent 1px 88px),
    radial-gradient(72% 110% at 92% 0%, rgba(201, 161, 91, .16), transparent 62%);
}
.page-about .about-hero__inner {
  position: relative;
  z-index: 1;
}
.page-about .about-hero__title {
  margin: .16em 0 .2em;
  font-family: var(--font-serif);
  font-weight: 900;
  font-size: clamp(3.1rem, 13vw, 7.2rem);
  line-height: .94;
  letter-spacing: .04em;
  color: var(--paper);
  text-shadow: 0 0 44px rgba(201, 161, 91, .18);
}
.page-about .about-hero__lede {
  margin: 0;
  max-width: 48ch;
  font-size: clamp(1rem, 2.2vw, 1.12rem);
  line-height: 1.9;
  color: var(--text);
}
.page-about .about-hero__meta {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(132px, 1fr));
  gap: .9rem 1.2rem;
  margin: clamp(1.3rem, 3.4vw, 2.1rem) 0 0;
  padding-top: 1rem;
  border-top: 1px dashed var(--line-soft);
}
.page-about .about-hero__meta dt {
  font-family: var(--font-mono);
  font-size: .68rem;
  letter-spacing: .16em;
  color: var(--bronze);
}
.page-about .about-hero__meta dd {
  margin: .28rem 0 0;
  font-size: .92rem;
  line-height: 1.6;
  color: var(--text-dim);
}

/* ——— 主体骨架：左侧目录 + 右侧纵向档案 ——— */
.page-about .about-body {
  display: grid;
  gap: clamp(1rem, 3vw, 2.4rem);
  padding-block: clamp(1.2rem, 3.2vw, 2.2rem) 0;
}
.page-about .about-rail {
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line-soft);
  padding-block: .55rem;
}
.page-about .about-rail__cap {
  margin: 0 0 .45rem;
  font-family: var(--font-mono);
  font-size: .66rem;
  letter-spacing: .18em;
  color: var(--text-dim);
}
.page-about .about-rail__list {
  display: flex;
  gap: .4rem;
  margin: 0;
  padding: 0 0 .15rem;
  list-style: none;
  overflow-x: auto;
  scrollbar-width: none;
}
.page-about .about-rail__list::-webkit-scrollbar {
  display: none;
}
.page-about .about-rail__link {
  display: inline-flex;
  align-items: baseline;
  gap: .38rem;
  padding: .34rem .6rem;
  border: 1px solid transparent;
  color: var(--text-dim);
  font-size: .84rem;
  white-space: nowrap;
  text-decoration: none;
  transition: color var(--dur) ease, border-color var(--dur) ease, background var(--dur) ease;
}
.page-about .about-rail__num {
  font-family: var(--font-mono);
  font-size: .68rem;
  letter-spacing: .1em;
  color: var(--bronze);
}
.page-about .about-rail__link:hover,
.page-about .about-rail__link:focus-visible {
  color: var(--bronze-bright);
  border-color: var(--line);
}
.page-about .about-rail__link[aria-current="true"],
.page-about .about-rail__link[aria-current="location"],
.page-about .about-rail__link[aria-current="page"] {
  color: var(--bronze-bright);
  border-color: var(--bronze);
  background: rgba(201, 161, 91, .08);
}
.page-about .about-stream {
  min-width: 0;
}

/* ——— 章节 ——— */
.page-about .about-sec {
  padding-block: clamp(1.6rem, 4vw, 2.8rem);
  border-top: 1px solid var(--line-soft);
  scroll-margin-top: 76px;
}
.page-about .about-sec:first-child {
  border-top: 0;
  padding-top: 0;
}
.page-about .about-sec__num {
  display: block;
  margin: 0 0 .55rem;
  font-size: .72rem;
  letter-spacing: .2em;
  color: var(--bronze);
}
.page-about .about-sec h2 {
  margin: 0 0 .7em;
  font-family: var(--font-serif);
  font-weight: 700;
  font-size: clamp(1.55rem, 5vw, 2.3rem);
  line-height: 1.25;
  letter-spacing: .02em;
  color: var(--paper);
}
.page-about .about-split {
  display: grid;
  gap: clamp(1rem, 3vw, 1.7rem);
}
.page-about .about-text p {
  margin: 0 0 1em;
  font-size: .97rem;
  line-height: 1.88;
  color: var(--text);
}
.page-about .about-text p:last-child {
  margin-bottom: 0;
}
.page-about .about-text strong {
  font-weight: 500;
  color: var(--bronze-bright);
}

/* ——— 图片 ——— */
.page-about .about-figure {
  margin: 0;
  padding: .45rem;
  border: 1px solid var(--line);
  background: var(--ink-deep);
}
.page-about .about-figure img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
  filter: saturate(.78) contrast(1.04);
}
.page-about .about-figure figcaption {
  padding: .55rem .25rem .15rem;
  font-family: var(--font-mono);
  font-size: .7rem;
  letter-spacing: .08em;
  line-height: 1.6;
  color: var(--text-dim);
}

/* ——— 规模数据条 ——— */
.page-about .about-stats {
  display: grid;
  gap: 1px;
  margin: clamp(1rem, 3vw, 1.6rem) 0 0;
  padding: 0;
  list-style: none;
  border: 1px solid var(--line);
  background: var(--line);
}
.page-about .about-stats__item {
  padding: 1rem 1rem 1.15rem;
  background: var(--ink-deep);
}
.page-about .about-stats__num {
  display: block;
  font-family: var(--font-serif);
  font-weight: 700;
  font-size: clamp(1.9rem, 7vw, 2.7rem);
  line-height: 1;
  letter-spacing: .01em;
  color: var(--bronze-bright);
  white-space: nowrap;
}
.page-about .about-stats__unit {
  display: block;
  margin-top: .4rem;
  font-family: var(--font-mono);
  font-size: .72rem;
  letter-spacing: .14em;
  color: var(--stone);
}
.page-about .about-stats__note {
  margin: .6rem 0 0;
  font-size: .84rem;
  line-height: 1.7;
  color: var(--text-dim);
}

/* ——— 档案抽屉 ——— */
.page-about .about-drawers {
  margin-top: clamp(1rem, 3vw, 1.5rem);
  border-top: 1px solid var(--line);
}
.page-about .about-drawer {
  border-bottom: 1px solid var(--line);
  border-left: 2px solid var(--line);
  background: rgba(241, 232, 214, .02);
  transition: border-color var(--dur) ease, background var(--dur) ease;
}
.page-about .about-drawer[open] {
  border-left-color: var(--bronze);
  background: rgba(201, 161, 91, .055);
}
.page-about .about-drawer__summary {
  display: flex;
  align-items: baseline;
  gap: .65rem;
  padding: .9rem .85rem .9rem .9rem;
  cursor: pointer;
  list-style: none;
}
.page-about .about-drawer__summary::-webkit-details-marker {
  display: none;
}
.page-about .about-drawer__summary:focus-visible {
  outline: 2px solid var(--bronze-bright);
  outline-offset: 2px;
}
.page-about .about-drawer__tag {
  flex: none;
  padding: .16rem .4rem;
  font-size: .68rem;
  letter-spacing: .12em;
  color: var(--ink);
  background: var(--bronze);
}
.page-about .about-drawer__title {
  font-family: var(--font-serif);
  font-size: .98rem;
  line-height: 1.55;
  color: var(--paper);
}
.page-about .about-drawer__chev {
  flex: none;
  margin-left: auto;
  align-self: center;
  width: .46rem;
  height: .46rem;
  border-right: 1.5px solid var(--bronze);
  border-bottom: 1.5px solid var(--bronze);
  transform: rotate(45deg);
  transition: transform var(--dur) ease;
}
.page-about .about-drawer[open] .about-drawer__chev {
  transform: rotate(-135deg);
}
.page-about .about-drawer__body {
  padding: 0 .95rem 1rem 1rem;
}
.page-about .about-drawer__body p {
  margin: 0;
  font-size: .92rem;
  line-height: 1.85;
  color: var(--text-dim);
}

/* ——— 团队要点 ——— */
.page-about .about-facts {
  display: grid;
  gap: .6rem;
  margin: 1.2rem 0 0;
  padding: 0;
  list-style: none;
}
.page-about .about-facts li {
  padding: .5rem .2rem .5rem .8rem;
  border-left: 2px solid var(--stone);
  font-size: .88rem;
  line-height: 1.7;
  color: var(--text-dim);
}
.page-about .about-facts__num {
  margin-right: .45rem;
  font-family: var(--font-mono);
  font-size: .95rem;
  letter-spacing: .04em;
  color: var(--paper);
}

/* ——— 发展节点时间轴 ——— */
.page-about .about-timeline {
  margin: 0;
  padding: 0;
  list-style: none;
}
.page-about .about-timeline__row {
  display: grid;
  grid-template-columns: 4.6rem minmax(0, 1fr);
  gap: .35rem .9rem;
  padding: .85rem 0;
  border-top: 1px dashed var(--line-soft);
}
.page-about .about-timeline__row:first-child {
  border-top: 0;
  padding-top: 0;
}
.page-about .about-timeline__year {
  padding-top: .18rem;
  font-size: .8rem;
  letter-spacing: .04em;
  color: var(--bronze);
}
.page-about .about-timeline__body h3 {
  margin: 0 0 .3em;
  font-family: var(--font-serif);
  font-weight: 700;
  font-size: 1.06rem;
  line-height: 1.5;
  color: var(--paper);
}
.page-about .about-timeline__body p {
  margin: 0;
  font-size: .9rem;
  line-height: 1.8;
  color: var(--text-dim);
}

/* ——— 服务承诺 ——— */
.page-about .about-promise__list {
  margin: clamp(.8rem, 2.5vw, 1.3rem) 0 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 1px;
  background: var(--line-soft);
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}
.page-about .about-promise__list li {
  display: grid;
  grid-template-columns: 2.4rem minmax(0, 1fr);
  gap: .2rem .8rem;
  padding: 1rem .2rem 1.1rem;
  background: var(--ink);
}
.page-about .about-promise__no {
  font-size: .78rem;
  letter-spacing: .1em;
  color: var(--cinnabar);
}
.page-about .about-promise__list h3 {
  margin: 0 0 .35em;
  font-family: var(--font-serif);
  font-weight: 700;
  font-size: 1.08rem;
  color: var(--paper);
}
.page-about .about-promise__list p {
  margin: 0;
  font-size: .92rem;
  line-height: 1.8;
  color: var(--text-dim);
}
.page-about .about-promise__cta {
  display: flex;
  flex-wrap: wrap;
  gap: .7rem;
  margin-top: clamp(1.1rem, 3vw, 1.6rem);
}
.page-about .about-promise__aside {
  margin: 1rem 0 0;
  font-size: .86rem;
  line-height: 1.8;
  color: var(--text-dim);
}
.page-about .about-promise__aside a {
  color: var(--bronze-bright);
  text-decoration: none;
  border-bottom: 1px solid var(--line);
}
.page-about .about-promise__aside a:hover,
.page-about .about-promise__aside a:focus-visible {
  border-bottom-color: var(--bronze-bright);
}

/* ——— 中等屏 ——— */
@media (min-width: 720px) {
  .page-about .about-stats {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
  .page-about .about-split {
    grid-template-columns: minmax(0, 1.1fr) minmax(0, .9fr);
    align-items: start;
  }
  .page-about .about-split--flip .about-figure {
    order: -1;
  }
}

/* ——— 宽屏：左侧刻度固定 ——— */
@media (min-width: 900px) {
  .page-about .about-body {
    grid-template-columns: var(--ab-rail) minmax(0, 1fr);
    align-items: start;
    gap: clamp(1.6rem, 3.4vw, 3rem);
  }
  .page-about .about-rail {
    position: sticky;
    top: 1.6rem;
    border-top: 0;
    border-bottom: 0;
    border-left: 1px solid var(--line);
    padding: .2rem 0 .2rem 1.05rem;
  }
  .page-about .about-rail__list {
    flex-direction: column;
    gap: .12rem;
    overflow: visible;
    padding-bottom: 0;
  }
  .page-about .about-rail__link {
    display: flex;
    width: 100%;
    white-space: normal;
    padding: .4rem .5rem;
  }
  .page-about .about-sec {
    scroll-margin-top: 1.6rem;
  }
  .page-about .about-figure--tall img {
    aspect-ratio: 3 / 4;
  }
}
<<<END>>>