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

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  overflow: hidden;
  background: var(--ink);
  color: var(--cream);
  padding: calc(var(--header-h) + 40px) 0 56px;
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  top: -24%;
  right: -22%;
  width: 68%;
  height: 156%;
  background: linear-gradient(158deg, rgba(184, 122, 61, .26), rgba(23, 69, 60, .22) 58%, rgba(18, 16, 14, 0) 86%);
  transform: rotate(13deg);
  pointer-events: none;
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  top: -10%;
  right: 26%;
  width: 1px;
  height: 130%;
  background: rgba(217, 164, 105, .45);
  transform: rotate(13deg);
  pointer-events: none;
}

.page-about .about-hero .container {
  position: relative;
  z-index: 1;
}

.page-about .about-hero .breadcrumb__link,
.page-about .about-hero .breadcrumb__current {
  color: rgba(245, 238, 228, .72);
}

.page-about .about-hero .breadcrumb__link:hover {
  color: var(--copper-bright);
}

.page-about .about-hero .breadcrumb__sep {
  color: rgba(217, 164, 105, .6);
}

.page-about .about-hero__grid {
  display: grid;
  gap: 36px;
  margin-top: 28px;
}

.page-about .about-hero__title {
  margin: 16px 0 20px;
  font-family: var(--font-serif);
  font-weight: 900;
  letter-spacing: -.02em;
  line-height: 1.04;
  color: var(--cream);
}

.page-about .about-hero__lede {
  max-width: 58ch;
  color: rgba(245, 238, 228, .8);
  font-size: 16px;
  line-height: 1.85;
  margin: 0;
}

.page-about .about-hero__facts {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 18px 20px;
  margin: 32px 0 0;
  padding-top: 22px;
  border-top: var(--hair);
}

.page-about .about-hero__fact-label {
  display: block;
  font-size: 12px;
  letter-spacing: .12em;
  color: rgba(245, 238, 228, .58);
  margin-bottom: 6px;
}

.page-about .about-hero__fact-num {
  display: block;
  margin: 0;
  font-family: var(--font-mono);
  font-size: 20px;
  letter-spacing: .06em;
  color: var(--copper-bright);
}

.page-about .about-hero__fact-num span {
  font-size: 11px;
  margin-left: 3px;
  color: rgba(245, 238, 228, .6);
  letter-spacing: .06em;
}

.page-about .about-hero__figure {
  margin: 0;
}

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

.page-about .about-hero__figure img {
  aspect-ratio: 16 / 10;
  border: var(--hair);
}

.page-about .img-frame__caption {
  font-size: 12px;
  letter-spacing: .08em;
  color: rgba(245, 238, 228, .55);
  margin-top: 10px;
}

/* ---------- 主体骨架 ---------- */
.page-about .about-shell-wrap {
  padding-top: 56px;
  padding-bottom: 88px;
}

.page-about .about-shell {
  display: grid;
  gap: 24px;
}

/* 章节索引 */
.page-about .about-shell > .chapter-rail {
  display: flex;
  gap: 4px;
  overflow-x: auto;
  padding-bottom: 10px;
  border-bottom: var(--hair-soft);
  -webkit-overflow-scrolling: touch;
}

.page-about .chapter-rail__link {
  display: flex;
  align-items: baseline;
  gap: 8px;
  flex: 0 0 auto;
  padding: 9px 12px;
  font-size: 14px;
  line-height: 1.4;
  white-space: nowrap;
  color: var(--stone);
  border-left: 2px solid transparent;
  text-decoration: none;
  transition: color .2s ease, background .2s ease, border-color .2s ease;
}

.page-about .chapter-rail__link:hover {
  color: var(--ink);
  background: rgba(184, 122, 61, .08);
}

.page-about .chapter-rail__link.is-active {
  color: var(--ink);
  background: rgba(184, 122, 61, .12);
  border-left-color: var(--copper);
}

.page-about .chapter-rail__num {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .12em;
  color: var(--copper);
}

/* 章节 */
.page-about .about-chapter {
  padding-top: 32px;
  margin-bottom: 64px;
}

.page-about .about-chapter:first-child {
  padding-top: 8px;
}

.page-about .about-chapter__title {
  position: relative;
  margin: 0 0 18px;
  padding-left: 16px;
  font-family: var(--font-serif);
  font-size: clamp(23px, 3.4vw, 33px);
  font-weight: 800;
  line-height: 1.32;
  letter-spacing: -.01em;
  color: var(--ink);
  border-left: 3px solid var(--copper);
}

.page-about .about-text {
  max-width: 64ch;
  font-size: 16px;
  line-height: 1.9;
  color: var(--stone);
  margin: 0 0 16px;
}

.page-about .about-text--intro {
  margin-bottom: 26px;
}

/* 数字块 */
.page-about .about-stat-row {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 24px 20px;
  margin-top: 30px;
  padding-top: 24px;
  border-top: var(--hair-soft);
}

.page-about .about-stat__num {
  display: block;
  font-family: var(--font-serif);
  font-size: clamp(27px, 5vw, 38px);
  font-weight: 800;
  line-height: 1;
  letter-spacing: -.02em;
  color: var(--ink);
}

.page-about .about-stat__unit {
  font-family: var(--font-sans);
  font-size: 12px;
  font-weight: 600;
  letter-spacing: .06em;
  color: var(--copper);
  margin-left: 4px;
}

.page-about .about-stat__label {
  display: block;
  margin-top: 9px;
  font-size: 13px;
  letter-spacing: .04em;
  color: var(--stone);
}

/* 剖面 */
.page-about .floor-diagram {
  margin: 0 0 24px;
}

.page-about .floor-diagram svg {
  display: block;
  width: 100%;
  max-width: 520px;
  height: auto;
}

.page-about .fd-band {
  fill: rgba(18, 16, 14, .08);
}

.page-about .fd-band--top {
  fill: rgba(184, 122, 61, .26);
}

.page-about .fd-lv {
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: .1em;
  fill: var(--copper);
}

.page-about .fd-name {
  font-family: var(--font-sans);
  font-size: 13px;
  fill: var(--ink-2);
}

.page-about .floor-list {
  border-top: var(--hair-soft);
}

.page-about .floor-row {
  display: grid;
  grid-template-columns: 40px minmax(0, 1fr);
  gap: 14px;
  padding: 20px 12px;
  border-bottom: var(--hair-soft);
  transition: background .2s ease;
}

.page-about .floor-row:hover,
.page-about .floor-row:focus-within {
  background: rgba(184, 122, 61, .07);
}

.page-about .floor-row__lv {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .1em;
  color: var(--copper);
  padding-top: 4px;
}

.page-about .floor-row__name {
  margin: 0 0 7px;
  font-family: var(--font-serif);
  font-size: 18px;
  font-weight: 700;
  letter-spacing: -.01em;
  color: var(--ink);
}

.page-about .floor-row__text {
  margin: 0;
  font-size: 15px;
  line-height: 1.88;
  color: var(--stone);
}

/* 团队 */
.page-about .team-grid {
  display: grid;
  gap: 28px;
}

.page-about .team-grid__text .about-text:last-of-type {
  margin-bottom: 22px;
}

.page-about .team-points {
  list-style: none;
  margin: 0;
  padding: 18px 0 0;
  border-top: var(--hair-soft);
}

.page-about .team-points li {
  display: flex;
  align-items: baseline;
  gap: 12px;
  padding: 9px 0;
  font-size: 14px;
  line-height: 1.7;
  color: var(--stone);
}

.page-about .team-points .mono {
  flex: 0 0 34px;
  font-family: var(--font-mono);
  font-size: 16px;
  letter-spacing: .06em;
  color: var(--copper);
}

.page-about .team-grid__figure {
  margin: 0;
}

.page-about .team-grid__figure img {
  aspect-ratio: 14 / 9;
}

.page-about .team-grid__figure .img-frame__caption {
  color: var(--stone);
}

/* 会员体系 */
.page-about .about-chapter--panel {
  padding-top: 0;
}

.page-about .about-membership {
  position: relative;
  overflow: hidden;
  background: var(--ink);
  color: var(--cream);
  padding: 32px 20px 28px;
}

.page-about .about-membership::before {
  content: "";
  position: absolute;
  right: -18%;
  bottom: -32%;
  width: 62%;
  height: 88%;
  background: linear-gradient(200deg, rgba(23, 69, 60, .5), rgba(184, 122, 61, .22) 62%, rgba(18, 16, 14, 0) 90%);
  transform: rotate(-9deg);
  pointer-events: none;
}

.page-about .about-membership > * {
  position: relative;
  z-index: 1;
}

.page-about .about-chapter__title--on-dark {
  color: var(--cream);
  border-left-color: var(--copper-bright);
}

.page-about .about-membership__intro {
  max-width: 62ch;
  margin: 0 0 12px;
  font-size: 15px;
  line-height: 1.95;
  color: rgba(245, 238, 228, .74);
}

.page-about .tier {
  padding: 20px 0;
  border-top: 1px solid rgba(217, 164, 105, .28);
}

.page-about .tier__head {
  display: flex;
  align-items: baseline;
  flex-wrap: wrap;
  gap: 8px 14px;
  margin-bottom: 10px;
}

.page-about .tier__name {
  margin: 0;
  font-family: var(--font-serif);
  font-size: 21px;
  font-weight: 800;
  letter-spacing: -.01em;
  color: var(--copper-bright);
}

.page-about .tier__fit {
  font-size: 12px;
  letter-spacing: .1em;
  color: rgba(245, 238, 228, .55);
}

.page-about .tier__text {
  margin: 0;
  font-size: 15px;
  line-height: 1.95;
  color: rgba(245, 238, 228, .82);
}

.page-about .about-membership__note {
  margin: 22px 0 0;
  padding-top: 18px;
  border-top: 1px solid rgba(217, 164, 105, .28);
  font-size: 14px;
  line-height: 1.9;
  color: rgba(245, 238, 228, .62);
}

/* 本地合作 */
.page-about .partner-list {
  list-style: none;
  margin: 24px 0 22px;
  padding: 0;
  border-top: var(--hair-soft);
}

.page-about .partner-list li {
  display: grid;
  grid-template-columns: 56px minmax(0, 1fr);
  gap: 14px;
  padding: 15px 0;
  border-bottom: var(--hair-soft);
  font-size: 15px;
  line-height: 1.85;
}

.page-about .partner-list b {
  font-family: var(--font-sans);
  font-size: 13px;
  font-weight: 700;
  letter-spacing: .1em;
  color: var(--ink);
  padding-top: 2px;
}

.page-about .partner-list span {
  color: var(--stone);
}

/* 时间线折叠 */
.page-about .timeline {
  position: relative;
  margin-top: 8px;
  padding-left: 22px;
  border-left: 1px solid rgba(184, 122, 61, .42);
}

.page-about .timeline .accordion__item {
  position: relative;
}

.page-about .timeline .accordion__item::before {
  content: "";
  position: absolute;
  left: -27px;
  top: 24px;
  width: 9px;
  height: 9px;
  background: var(--copper);
  border-radius: 50%;
  box-shadow: 0 0 0 4px var(--cream);
}

.page-about .timeline .accordion__trigger {
  display: flex;
  align-items: baseline;
  flex-wrap: wrap;
  gap: 6px 14px;
  width: 100%;
  padding: 16px 0 14px;
  background: none;
  border: 0;
  border-bottom: var(--hair-soft);
  text-align: left;
  cursor: pointer;
  font-family: inherit;
  color: inherit;
}

.page-about .timeline .accordion__trigger:hover .timeline__title {
  color: var(--copper);
}

.page-about .timeline__year {
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: .12em;
  color: var(--copper);
}

.page-about .timeline__title {
  flex: 1 1 12ch;
  font-family: var(--font-serif);
  font-size: 18px;
  font-weight: 700;
  letter-spacing: -.01em;
  color: var(--ink);
  transition: color .2s ease;
}

.page-about .timeline .accordion__inner {
  padding: 14px 0 18px;
}

.page-about .timeline .accordion__inner p {
  margin: 0;
  max-width: 62ch;
  font-size: 15px;
  line-height: 1.95;
  color: var(--stone);
}

/* 收尾 */
.page-about .about-cta {
  margin-top: 8px;
  padding: 34px 22px 32px;
  background: var(--ink-2);
  color: var(--cream);
  border-top: 3px solid var(--copper);
}

.page-about .about-cta .eyebrow {
  color: var(--copper-bright);
}

.page-about .about-cta__title {
  margin: 12px 0 14px;
  font-family: var(--font-serif);
  font-size: clamp(24px, 4vw, 34px);
  font-weight: 800;
  line-height: 1.28;
  letter-spacing: -.01em;
  color: var(--cream);
}

.page-about .about-cta__text {
  max-width: 56ch;
  margin: 0 0 24px;
  font-size: 15px;
  line-height: 1.9;
  color: rgba(245, 238, 228, .78);
}

.page-about .about-cta__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.page-about .about-cta__note {
  margin: 22px 0 0;
  font-size: 13px;
  line-height: 1.8;
  color: rgba(245, 238, 228, .58);
}

.page-about .about-cta__note a {
  color: var(--copper-bright);
  text-decoration: none;
  border-bottom: 1px solid rgba(217, 164, 105, .45);
}

.page-about .about-cta__note a:hover {
  color: var(--cream);
}

/* ---------- 响应式 ---------- */
@media (min-width: 640px) {
  .page-about .about-hero {
    padding: calc(var(--header-h) + 56px) 0 72px;
  }

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

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

  .page-about .about-hero__figure img {
    aspect-ratio: 16 / 9;
  }

  .page-about .about-cta {
    padding: 44px 36px 40px;
  }
}

@media (min-width: 900px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 1.12fr) minmax(0, .88fr);
    align-items: end;
    gap: 52px;
  }

  .page-about .about-hero__figure img {
    aspect-ratio: 4 / 5;
  }

  .page-about .team-grid {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, .95fr);
    gap: 44px;
    align-items: start;
  }

  .page-about .about-membership {
    padding: 44px 40px 40px;
  }

  .page-about .tier {
    display: grid;
    grid-template-columns: 210px minmax(0, 1fr);
    gap: 28px;
    align-items: start;
  }

  .page-about .tier__head {
    display: block;
    margin-bottom: 0;
  }

  .page-about .tier__fit {
    display: block;
    margin-top: 8px;
  }

  .page-about .partner-list li {
    grid-template-columns: 72px minmax(0, 1fr);
    gap: 20px;
  }
}

@media (min-width: 1024px) {
  .page-about .about-shell-wrap {
    padding-top: 72px;
    padding-bottom: 104px;
  }

  .page-about .about-shell {
    grid-template-columns: 176px minmax(0, 1fr);
    gap: 64px;
    align-items: start;
  }

  .page-about .about-shell > .chapter-rail {
    position: sticky;
    top: calc(var(--header-h) + 32px);
    display: block;
    overflow: visible;
    padding-bottom: 0;
    border-bottom: 0;
    border-left: var(--hair);
  }

  .page-about .chapter-rail__link {
    white-space: normal;
    padding: 11px 12px 11px 16px;
    margin-left: -1px;
    border-left: 2px solid transparent;
  }

  .page-about .about-chapter {
    margin-bottom: 88px;
  }

  .page-about .floor-row {
    grid-template-columns: 52px minmax(0, 1fr);
    gap: 20px;
    padding: 22px 16px;
  }
}

@media (min-width: 1180px) {
  .page-about .about-hero__title {
    font-size: clamp(56px, 5.4vw, 82px);
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .chapter-rail__link,
  .page-about .floor-row,
  .page-about .timeline__title {
    transition: none;
  }
}
<<<END>>>