.page-about {
  --about-rail: 88px;
  --gold-deep: #8A6412;
  --about-ink-soft: #4B4137;
  background: var(--ink-night);
  color: var(--fg);
  overflow-x: hidden;
}

/* ---------- 面包屑 ---------- */
.page-about .breadcrumbs {
  padding: 20px 0 0;
}
.page-about .breadcrumbs__list {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  list-style: none;
  margin: 0;
  padding: 0;
  font-family: var(--font-data);
  font-size: 12px;
  letter-spacing: .04em;
}
.page-about .breadcrumbs__item {
  color: var(--mist);
}
.page-about .breadcrumbs__link {
  color: var(--fg-soft);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color .2s ease, border-color .2s ease;
}
.page-about .breadcrumbs__link:hover,
.page-about .breadcrumbs__link:focus-visible {
  color: var(--gold);
  border-bottom-color: var(--gold);
}
.page-about .breadcrumbs__item [aria-current="page"] {
  color: var(--paper);
  border-bottom: 1px solid var(--line-strong);
}
.page-about .breadcrumbs__sep {
  color: var(--line-strong);
}

/* ---------- 首屏框景 ---------- */
.page-about .about-hero {
  padding: 22px 0 48px;
}

.page-about .about-hero__frame {
  position: relative;
  padding: 30px 20px 34px;
  border: 1px solid var(--line-strong);
  border-radius: var(--radius);
  background:
    radial-gradient(130% 100% at 6% 0%, rgba(123, 226, 74, .10), transparent 58%),
    radial-gradient(110% 90% at 100% 100%, rgba(201, 162, 39, .12), transparent 62%),
    linear-gradient(172deg, var(--ink-stand) 0%, var(--ink-night) 76%);
  box-shadow: inset 0 1px 0 rgba(242, 233, 216, .07);
  overflow: hidden;
}
.page-about .about-hero__frame::before {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background-image:
    radial-gradient(circle at 50% 128%, transparent 154px, rgba(242, 233, 216, .06) 155px, rgba(242, 233, 216, .06) 156px, transparent 157px),
    repeating-linear-gradient(90deg, transparent 0 82px, rgba(242, 233, 216, .035) 82px 83px);
  opacity: .9;
}

.page-about .about-hero__meta {
  position: relative;
  z-index: 1;
  display: flex;
  flex-wrap: wrap;
  gap: 8px 18px;
  align-items: baseline;
  justify-content: space-between;
}
.page-about .about-hero__stamp {
  margin: 0;
  font-family: var(--font-data);
  font-size: 12px;
  letter-spacing: .1em;
  color: var(--mist);
}

.page-about .about-hero__title {
  position: relative;
  z-index: 1;
  margin: 20px 0 0;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(30px, 6.8vw, 60px);
  line-height: 1.12;
  letter-spacing: .01em;
  color: var(--paper-hi);
}

.page-about .about-hero__lede {
  position: relative;
  z-index: 1;
  margin: 18px 0 0;
  max-width: 58ch;
  font-size: 15px;
  line-height: 1.85;
  color: var(--fg-soft);
}

.page-about .about-anchor {
  position: relative;
  z-index: 1;
  display: flex;
  align-items: flex-end;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 28px;
  padding-top: 22px;
  border-top: 1px solid var(--line);
}
.page-about .about-anchor__value {
  font-family: var(--font-data);
  font-weight: 900;
  font-size: clamp(62px, 17vw, 132px);
  line-height: .8;
  letter-spacing: -.04em;
  font-variant-numeric: tabular-nums;
  color: var(--gold);
}
.page-about .about-anchor__unit {
  font-family: var(--font-data);
  font-size: 15px;
  font-weight: 700;
  color: var(--gold);
  padding-bottom: 10px;
}
.page-about .about-anchor__label {
  flex: 1 1 210px;
  min-width: 170px;
  margin: 0 0 6px;
  padding-left: 12px;
  border-left: 1px solid var(--line-strong);
  font-size: 13px;
  line-height: 1.75;
  color: var(--fg-soft);
}

.page-about .about-hero__facts {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin: 26px 0 0;
  padding: 0;
  border: 1px solid var(--line);
  background: var(--line);
}
.page-about .about-fact {
  padding: 12px 14px;
  background: var(--ink-night);
}
.page-about .about-fact dt {
  margin: 0;
  font-size: 12px;
  letter-spacing: .08em;
  color: var(--mist);
}
.page-about .about-fact dd {
  margin: 6px 0 0;
  font-family: var(--font-data);
  font-weight: 700;
  font-size: 17px;
  font-variant-numeric: tabular-nums;
  color: var(--paper);
}

/* ---------- 章节索引带 ---------- */
.page-about .about-toc {
  position: sticky;
  top: 0;
  z-index: 20;
  background: rgba(11, 22, 38, .94);
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  backdrop-filter: blur(6px);
}
.page-about .about-toc__list {
  display: flex;
  gap: 22px;
  align-items: center;
  list-style: none;
  margin: 0;
  padding: 0;
  overflow-x: auto;
  scrollbar-width: none;
  -webkit-overflow-scrolling: touch;
}
.page-about .about-toc__list::-webkit-scrollbar {
  display: none;
}
.page-about .about-toc__item {
  flex: 0 0 auto;
}
.page-about .about-toc__link {
  display: inline-flex;
  align-items: baseline;
  gap: 7px;
  padding: 13px 0;
  font-size: 13px;
  color: var(--fg-soft);
  text-decoration: none;
  white-space: nowrap;
  border-bottom: 1px solid transparent;
  transition: color .2s ease, border-color .2s ease;
}
.page-about .about-toc__num {
  font-family: var(--font-data);
  font-size: 11px;
  font-weight: 700;
  letter-spacing: .08em;
  color: var(--gold);
}
.page-about .about-toc__link:hover,
.page-about .about-toc__link:focus-visible {
  color: var(--paper-hi);
  border-bottom-color: var(--gold);
}

/* ---------- 通用章节骨架 ---------- */
.page-about .about-section {
  padding: 46px 0;
  border-bottom: 1px solid var(--line);
  scroll-margin-top: 60px;
}
.page-about .about-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
}
.page-about .about-rail {
  display: none;
}

.page-about .section-head__index {
  margin: 0;
  font-family: var(--font-data);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: .14em;
  color: var(--gold);
}
.page-about .section-head__title {
  margin: 10px 0 0;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(23px, 4.6vw, 34px);
  line-height: 1.26;
  color: var(--paper-hi);
}
.page-about .section-head__note {
  margin: 12px 0 0;
  max-width: 60ch;
  font-size: 14px;
  line-height: 1.85;
  color: var(--fg-soft);
}

.page-about .about-prose {
  margin-top: 20px;
}
.page-about .about-prose p {
  margin: 0 0 14px;
  max-width: 64ch;
  font-size: 15px;
  line-height: 1.85;
  color: var(--fg-soft);
}
.page-about .about-prose p:last-child {
  margin-bottom: 0;
}

/* ---------- 01 边界对照 ---------- */
.page-about .about-boundary {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1px;
  margin-top: 26px;
  border: 1px solid var(--line);
  background: var(--line);
}
.page-about .about-boundary__col {
  padding: 18px 16px;
  background: var(--ink-stand);
}
.page-about .about-boundary__col--out {
  background: linear-gradient(180deg, rgba(210, 84, 42, .12), transparent 70%), var(--ink-stand);
}
.page-about .about-boundary__col--in {
  background: linear-gradient(180deg, rgba(123, 226, 74, .10), transparent 70%), var(--ink-stand);
}
.page-about .about-boundary ul {
  list-style: none;
  margin: 14px 0 0;
  padding: 0;
}
.page-about .about-boundary li {
  position: relative;
  padding-left: 14px;
  font-size: 14px;
  line-height: 1.95;
  color: var(--fg-soft);
}
.page-about .about-boundary li::before {
  content: "";
  position: absolute;
  left: 0;
  top: .82em;
  width: 6px;
  height: 1px;
  background: var(--mist);
}

/* ---------- 02 奶油纸面板 ---------- */
.page-about .about-paper {
  background: var(--paper);
  color: var(--ink-dark);
  border-bottom: 1px solid rgba(34, 26, 20, .18);
}
.page-about .about-paper .section-head__index {
  color: var(--gold-deep);
}
.page-about .about-paper .section-head__title {
  color: var(--ink-dark);
}
.page-about .about-paper .section-head__note {
  color: var(--about-ink-soft);
}
.page-about .about-paper .about-rail__num {
  color: var(--gold-deep);
}
.page-about .about-paper .about-rail__bar {
  background: linear-gradient(180deg, var(--gold-deep), transparent);
}

.page-about .about-process__figure {
  margin: 24px 0 0;
}
.page-about .about-process__figure .figure__caption {
  margin-top: 10px;
  font-size: 12px;
  line-height: 1.7;
  color: #6B5F52;
}

.page-about .about-steps {
  list-style: none;
  margin: 22px 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1px;
  border: 1px solid rgba(34, 26, 20, .18);
  background: rgba(34, 26, 20, .18);
}
.page-about .about-step {
  padding: 20px 18px;
  background: var(--paper-hi);
}
.page-about .about-step__num {
  display: inline-block;
  font-family: var(--font-data);
  font-weight: 900;
  font-size: 20px;
  letter-spacing: .06em;
  font-variant-numeric: tabular-nums;
  color: var(--orange);
}
.page-about .about-step__title {
  margin: 8px 0 0;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 19px;
  line-height: 1.35;
  color: var(--ink-dark);
}
.page-about .about-step__text {
  margin: 10px 0 0;
  font-size: 14px;
  line-height: 1.85;
  color: var(--about-ink-soft);
}
.page-about .about-step__more {
  margin-top: 12px;
  padding-top: 10px;
  border-top: 1px dashed rgba(34, 26, 20, .3);
}
.page-about .about-step__more summary {
  cursor: pointer;
  list-style: none;
  font-family: var(--font-data);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: .06em;
  color: var(--gold-deep);
}
.page-about .about-step__more summary::-webkit-details-marker {
  display: none;
}
.page-about .about-step__more summary::before {
  content: "＋ ";
}
.page-about .about-step__more[open] summary::before {
  content: "－ ";
}
.page-about .about-step__more summary:hover,
.page-about .about-step__more summary:focus-visible {
  color: var(--orange);
  outline: none;
  text-decoration: underline;
}
.page-about .about-step__more p {
  margin: 10px 0 0;
  font-size: 13px;
  line-height: 1.8;
  color: var(--about-ink-soft);
}

/* ---------- 03 纵向时间轴 ---------- */
.page-about .about-timeline {
  list-style: none;
  margin: 28px 0 0;
  padding: 0 0 0 24px;
  border-left: 1px dashed var(--line-strong);
}
.page-about .about-timeline__item {
  position: relative;
  padding-bottom: 32px;
}
.page-about .about-timeline__item:last-child {
  padding-bottom: 0;
}
.page-about .about-timeline__item::before {
  content: "";
  position: absolute;
  left: -29px;
  top: 5px;
  width: 9px;
  height: 9px;
  border: 1px solid var(--gold);
  border-radius: 50%;
  background: var(--ink-night);
  transition: background .35s ease, border-color .35s ease, box-shadow .35s ease;
}
.page-about .about-timeline__item.is-active::before {
  background: var(--pulse);
  border-color: var(--pulse);
  box-shadow: 0 0 0 4px rgba(123, 226, 74, .16);
}
.page-about .about-timeline__label {
  margin: 0;
  font-family: var(--font-data);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: .12em;
  color: var(--gold);
}
.page-about .about-timeline__title {
  margin: 8px 0 0;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 19px;
  line-height: 1.35;
  color: var(--paper-hi);
}
.page-about .about-timeline__text {
  margin: 10px 0 0;
  max-width: 62ch;
  font-size: 14px;
  line-height: 1.85;
  color: var(--fg-soft);
}
.page-about .about-timeline__figure {
  margin: 16px 0 0;
  max-width: 520px;
}
.page-about .about-timeline__figure .figure__caption {
  margin-top: 9px;
  font-size: 12px;
  line-height: 1.7;
  color: var(--mist);
}

/* ---------- 04 团队 ---------- */
.page-about .about-team {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 26px;
  margin-top: 26px;
}
.page-about .about-role-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 14px;
}
.page-about .about-role-table th,
.page-about .about-role-table td {
  padding: 11px 12px;
  text-align: left;
  border-bottom: 1px solid var(--line);
  vertical-align: top;
}
.page-about .about-role-table thead th {
  font-family: var(--font-data);
  font-size: 11px;
  font-weight: 700;
  letter-spacing: .1em;
  color: var(--mist);
  border-bottom: 1px solid var(--line-strong);
  background: var(--ink-stand);
}
.page-about .about-role-table tbody th {
  font-weight: 700;
  color: var(--paper);
}
.page-about .about-role-table tbody td {
  color: var(--fg-soft);
  line-height: 1.7;
}
.page-about .about-role-table tbody td:nth-child(2) {
  font-family: var(--font-data);
  font-variant-numeric: tabular-nums;
  font-weight: 700;
  color: var(--gold);
  width: 4.5em;
}
.page-about .about-role-table tbody tr:hover {
  background: rgba(185, 245, 140, .1);
}

.page-about .about-shift {
  margin-top: 24px;
  padding: 18px 16px;
  border: 1px solid var(--line);
  background: var(--ink-stand);
}
.page-about .about-shift__title {
  margin: 0;
  font-family: var(--font-display);
  font-size: 17px;
  font-weight: 700;
  color: var(--paper-hi);
}
.page-about .about-shift__list {
  list-style: none;
  margin: 14px 0 0;
  padding: 0;
}
.page-about .about-shift__list li {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 4px 12px;
  padding: 9px 0;
  border-bottom: 1px dashed var(--line);
  font-size: 14px;
  line-height: 1.75;
  color: var(--fg-soft);
}
.page-about .about-shift__list li:last-child {
  border-bottom: 0;
  padding-bottom: 0;
}
.page-about .about-shift__time {
  flex: 0 0 auto;
  font-family: var(--font-data);
  font-weight: 700;
  font-size: 13px;
  font-variant-numeric: tabular-nums;
  color: var(--pulse);
}

.page-about .about-team__figure {
  margin: 0;
}
.page-about .about-team__figure .figure__caption {
  margin-top: 10px;
  font-size: 12px;
  line-height: 1.7;
  color: var(--mist);
}

/* ---------- 05 互校 ---------- */
.page-about .about-partners {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1px;
  margin-top: 26px;
  border: 1px solid var(--line);
  background: var(--line);
}
.page-about .about-partner {
  padding: 20px 18px;
  background: var(--ink-stand);
}
.page-about .about-partner__num {
  margin: 0;
  font-family: var(--font-data);
  font-weight: 900;
  font-size: 40px;
  line-height: 1;
  letter-spacing: -.03em;
  font-variant-numeric: tabular-nums;
  color: var(--gold);
}
.page-about .about-partner__kicker {
  margin: 0;
  font-family: var(--font-data);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: .12em;
  color: var(--orange);
}
.page-about .about-partner__title {
  margin: 10px 0 0;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 18px;
  line-height: 1.4;
  color: var(--paper-hi);
}
.page-about .about-partner__text {
  margin: 10px 0 0;
  font-size: 14px;
  line-height: 1.85;
  color: var(--fg-soft);
}
.page-about .about-partner--wide {
  background: linear-gradient(120deg, rgba(210, 84, 42, .1), transparent 65%), var(--ink-stand);
}

/* ---------- 06 联系 ---------- */
.page-about .about-cta {
  border-bottom: 0;
  padding-bottom: 64px;
}
.page-about .about-cta__inner {
  position: relative;
  padding: 30px 20px 34px;
  border: 1px solid var(--line-strong);
  border-radius: var(--radius);
  background:
    radial-gradient(100% 120% at 100% 0%, rgba(201, 162, 39, .13), transparent 60%),
    linear-gradient(180deg, var(--ink-stand), var(--ink-night));
  box-shadow: inset 0 1px 0 rgba(242, 233, 216, .06);
}
.page-about .about-cta__title {
  margin: 12px 0 0;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(22px, 4.4vw, 32px);
  line-height: 1.28;
  color: var(--paper-hi);
}
.page-about .about-cta__lede {
  margin: 14px 0 0;
  max-width: 58ch;
  font-size: 15px;
  line-height: 1.85;
  color: var(--fg-soft);
}
.page-about .about-contact {
  list-style: none;
  margin: 24px 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1px;
  border: 1px solid var(--line);
  background: var(--line);
}
.page-about .about-contact__row {
  display: flex;
  flex-wrap: wrap;
  gap: 4px 14px;
  align-items: baseline;
  padding: 13px 15px;
  background: var(--ink-night);
}
.page-about .about-contact__label {
  flex: 0 0 5.4em;
  font-family: var(--font-data);
  font-size: 12px;
  letter-spacing: .08em;
  color: var(--mist);
}
.page-about .about-contact__value {
  flex: 1 1 200px;
  font-family: var(--font-data);
  font-size: 14px;
  font-weight: 700;
  letter-spacing: .01em;
  color: var(--paper);
  word-break: break-word;
}
.page-about .about-cta__note {
  margin: 18px 0 0;
  max-width: 62ch;
  padding-left: 13px;
  border-left: 1px solid var(--orange);
  font-size: 13px;
  line-height: 1.8;
  color: var(--fg-soft);
}
.page-about .about-cta__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 24px;
}

/* ---------- 图片容器兜底 ---------- */
.page-about .figure__frame {
  overflow: hidden;
  border: 1px solid var(--line-strong);
  border-radius: var(--radius);
  background: var(--ink-stand);
}
.page-about .figure__img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
  filter: saturate(.72) contrast(1.08);
}
.page-about .about-paper .figure__frame {
  border-color: rgba(34, 26, 20, .22);
  background: #E7DCC7;
}

/* ---------- 动效降级 ---------- */
@media (prefers-reduced-motion: reduce) {
  .page-about .about-timeline__item::before,
  .page-about .about-toc__link,
  .page-about .breadcrumbs__link {
    transition: none;
  }
}

/* ---------- 480px 以上 ---------- */
@media (min-width: 480px) {
  .page-about .about-hero__frame {
    padding: 36px 28px 40px;
  }
  .page-about .about-cta__inner {
    padding: 34px 28px 38px;
  }
  .page-about .about-partners {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
  .page-about .about-partner--wide {
    grid-column: 1 / -1;
  }
}

/* ---------- 700px 以上 ---------- */
@media (min-width: 700px) {
  .page-about .about-hero {
    padding: 30px 0 56px;
  }
  .page-about .about-hero__facts {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
  .page-about .about-boundary {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
  .page-about .about-steps {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
  .page-about .about-team {
    grid-template-columns: minmax(0, 1.35fr) minmax(0, 1fr);
    align-items: start;
  }
  .page-about .about-contact {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
  .page-about .about-section {
    padding: 58px 0;
  }
}

/* ---------- 900px 以上：左侧常驻刻度 ---------- */
@media (min-width: 900px) {
  .page-about .about-layout {
    grid-template-columns: var(--about-rail) minmax(0, 1fr);
    column-gap: 34px;
  }
  .page-about .about-rail {
    display: block;
    align-self: start;
    position: sticky;
    top: 74px;
    padding-top: 4px;
  }
  .page-about .about-rail__num {
    display: block;
    font-family: var(--font-data);
    font-size: 13px;
    font-weight: 700;
    letter-spacing: .12em;
    font-variant-numeric: tabular-nums;
    color: var(--gold);
  }
  .page-about .about-rail__bar {
    display: block;
    width: 1px;
    height: 64px;
    margin: 12px 0 0 5px;
    background: linear-gradient(180deg, var(--gold), transparent);
  }
  .page-about .about-toc {
    top: 0;
  }
  .page-about .about-section {
    padding: 68px 0;
    scroll-margin-top: 68px;
  }
}

/* ---------- 1080px 以上 ---------- */
@media (min-width: 1080px) {
  .page-about .about-hero__frame {
    padding: 48px 44px 52px;
  }
  .page-about .about-partners {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
  .page-about .about-partner--wide {
    grid-column: auto;
  }
  .page-about .about-step {
    padding: 26px 24px;
  }
  .page-about .about-cta__inner {
    padding: 46px 44px 50px;
  }
}
<<<END>>>