.page-about {
  --about-rail-w: 84px;
  --about-line: rgba(43, 54, 59, .16);
  background: var(--c-sand);
  color: var(--c-ink);
  font-family: var(--font-body);
  line-height: 1.75;
  overflow-x: hidden;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  overflow: hidden;
  padding: clamp(76px, 12vw, 132px) 0 clamp(34px, 5vw, 56px);
  background:
    radial-gradient(115% 95% at 8% -10%, #3d3529 0%, #232b2e 44%, #171d20 100%);
  color: var(--c-sand);
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image: repeating-linear-gradient(114deg, rgba(244, 235, 221, .05) 0 1px, transparent 1px 17px);
  pointer-events: none;
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  right: -8%;
  bottom: -58%;
  width: min(560px, 82vw);
  height: 340px;
  background: radial-gradient(closest-side, rgba(233, 184, 95, .22), rgba(233, 184, 95, 0) 72%);
  pointer-events: none;
}

.page-about .about-hero .breadcrumbs {
  position: relative;
  z-index: 2;
  color: rgba(244, 235, 221, .62);
  font-size: 13px;
  margin-bottom: clamp(24px, 4vw, 40px);
}

.page-about .about-hero .breadcrumbs a {
  color: var(--c-lamp);
  text-decoration: none;
}

.page-about .about-hero .breadcrumbs a:hover {
  text-decoration: underline;
}

.page-about .about-hero__grid {
  position: relative;
  z-index: 2;
  display: grid;
  gap: 32px;
}

.page-about .about-hero__kicker {
  margin: 0 0 14px;
  font-size: 12px;
  letter-spacing: .2em;
  color: var(--c-lamp);
  text-transform: uppercase;
}

.page-about .about-hero__title {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(36px, 7.4vw, 74px);
  line-height: 1.06;
  letter-spacing: -.01em;
  color: var(--c-sand);
}

.page-about .about-hero__lead {
  margin: 20px 0 0;
  max-width: 48ch;
  font-size: clamp(15px, 1.6vw, 17px);
  line-height: 1.85;
  color: rgba(244, 235, 221, .8);
}

.page-about .about-facts {
  list-style: none;
  margin: 0;
  padding: 20px 0 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 18px 20px;
  border-top: 1px solid rgba(244, 235, 221, .16);
}

.page-about .about-facts__item {
  position: relative;
  padding-left: 12px;
}

.page-about .about-facts__item::before {
  content: "";
  position: absolute;
  left: 0;
  top: 6px;
  bottom: 4px;
  width: 2px;
  background: linear-gradient(var(--c-gold), rgba(190, 138, 51, .18));
}

.page-about .about-facts__num {
  display: block;
  font-size: clamp(24px, 3.4vw, 32px);
  line-height: 1.1;
  color: var(--c-lamp);
  letter-spacing: -.02em;
}

.page-about .about-facts__label {
  display: block;
  margin-top: 4px;
  font-size: 12.5px;
  letter-spacing: .06em;
  color: rgba(244, 235, 221, .66);
}

/* ---------- 主体骨架 ---------- */
.page-about .about-body {
  padding: clamp(28px, 4vw, 48px) 0 clamp(48px, 7vw, 88px);
}

.page-about .about-layout {
  display: grid;
  gap: 20px;
}

/* ---------- 索引条 ---------- */
.page-about .about-rail {
  display: flex;
  flex-wrap: nowrap;
  align-items: center;
  gap: 6px;
  overflow-x: auto;
  padding: 0 0 10px;
  margin: 0;
  position: static;
  border-bottom: 1px solid var(--about-line);
  scrollbar-width: thin;
  -webkit-overflow-scrolling: touch;
}

.page-about .about-rail__cap {
  display: none;
  font-size: 11px;
  letter-spacing: .14em;
  color: var(--c-gold-deep);
}

.page-about .about-rail__link {
  flex: 0 0 auto;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 7px 10px;
  border-radius: var(--radius);
  font-size: 13px;
  line-height: 1.2;
  color: var(--c-qilian);
  text-decoration: none;
  white-space: nowrap;
  transition: background-color .16s var(--ease), color .16s var(--ease);
}

.page-about .about-rail__num {
  font-size: 11px;
  color: var(--c-gold-deep);
  transition: color .16s var(--ease);
}

.page-about .about-rail__link:hover,
.page-about .about-rail__link[aria-current="true"] {
  background: var(--c-gold-deep);
  color: var(--c-gravel);
}

.page-about .about-rail__link:hover .about-rail__num,
.page-about .about-rail__link[aria-current="true"] .about-rail__num {
  color: var(--c-lamp);
}

/* ---------- 区块通用 ---------- */
.page-about .about-sec {
  padding: clamp(36px, 5vw, 56px) 0;
  border-top: 1px solid var(--about-line);
}

.page-about .about-track > .about-sec:first-child {
  border-top: 0;
  padding-top: 8px;
}

.page-about .about-sec__head {
  max-width: 66ch;
}

.page-about .about-sec__cap {
  display: block;
  font-size: 11.5px;
  letter-spacing: .2em;
  color: var(--c-gold-deep);
}

.page-about .about-sec__title {
  margin: 10px 0 0;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(23px, 3.4vw, 38px);
  line-height: 1.24;
  color: var(--c-ink);
}

.page-about .about-sec__note {
  margin: 14px 0 0;
  font-size: clamp(15px, 1.5vw, 16.5px);
  line-height: 1.82;
  color: var(--c-qilian);
}

.page-about .prose p {
  margin: 0 0 14px;
  font-size: 16px;
  line-height: 1.85;
}

/* ---------- 年表：前言 + 图 ---------- */
.page-about .about-intro {
  margin-top: 26px;
  display: grid;
  gap: 20px;
}

.page-about .about-intro__text {
  max-width: 62ch;
}

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

.page-about .media-frame {
  overflow: hidden;
  border-radius: var(--radius);
  background: var(--c-earth);
}

.page-about .media-frame img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
  filter: saturate(.72) contrast(.98);
}

.page-about .media-frame__caption {
  padding: 9px 12px 11px;
  font-size: 12px;
  line-height: 1.6;
  letter-spacing: .02em;
  color: var(--c-qilian);
  background: var(--c-earth);
}

/* ---------- 时间线 ---------- */
.page-about .tl {
  list-style: none;
  margin: 30px 0 0;
  padding: 0;
  position: relative;
}

.page-about .tl::before {
  content: "";
  position: absolute;
  left: 7px;
  top: 10px;
  bottom: 14px;
  width: 1px;
  background: linear-gradient(180deg, var(--c-gold) 0%, rgba(190, 138, 51, .12) 100%);
}

.page-about .tl__item {
  position: relative;
  padding: 0 0 26px 26px;
}

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

.page-about .tl__item::before {
  content: "";
  position: absolute;
  left: 0;
  top: 9px;
  width: 15px;
  height: 15px;
  background: var(--c-sand);
  border: 2px solid var(--c-gold);
  border-radius: 1px;
  transform: rotate(45deg);
}

.page-about .tl__item:nth-child(4)::before {
  border-color: var(--c-ochre);
}

.page-about .tl__year {
  font-size: 24px;
  line-height: 1;
  letter-spacing: -.02em;
  color: var(--c-gold-deep);
}

.page-about .tl__body {
  margin-top: 8px;
  max-width: 62ch;
}

.page-about .tl__title {
  margin: 0 0 6px;
  font-family: var(--font-display);
  font-size: 19px;
  font-weight: 700;
  line-height: 1.4;
  color: var(--c-ink);
}

.page-about .tl__body p {
  margin: 0;
  font-size: 15.5px;
  line-height: 1.82;
  color: #43535a;
}

/* ---------- 场地表 ---------- */
.page-about .space-table {
  margin-top: 24px;
  border-top: 1px solid var(--about-line);
}

.page-about .space-row {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 4px 14px;
  padding: 14px 10px;
  border-bottom: 1px solid var(--about-line);
  font-size: 15px;
  line-height: 1.7;
}

.page-about .space-row:nth-child(even) {
  background: rgba(228, 207, 175, .34);
}

.page-about .space-row--head {
  display: none;
}

.page-about .space-row__name {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 17px;
  color: var(--c-ink);
}

.page-about .space-row__num {
  color: var(--c-ochre);
  font-size: 14px;
  letter-spacing: .02em;
  align-self: center;
}

.page-about .space-row__use {
  grid-column: 1 / -1;
  color: #4a5a61;
  font-size: 14.5px;
}

.page-about .about-space__fig {
  margin: 26px 0 0;
}

/* ---------- 平面图 ---------- */
.page-about .about-sec--plan {
  padding-bottom: clamp(28px, 4vw, 40px);
}

.page-about .plan-wrap {
  margin-top: 24px;
  padding: 12px;
  background: linear-gradient(150deg, var(--c-earth) 0%, #f0e2cb 55%, var(--c-earth) 100%);
  border-radius: var(--radius);
}

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

.page-about .plan__zone {
  fill: var(--c-gravel);
  stroke: rgba(43, 54, 59, .3);
  stroke-width: 1.5;
  transition: fill .18s var(--ease);
}

.page-about .plan__zone:hover {
  fill: #f2dcb2;
}

.page-about .plan__zone--rooms {
  fill: rgba(251, 246, 236, .72);
}

.page-about .plan__grid {
  fill: none;
  stroke: rgba(43, 54, 59, .26);
  stroke-width: 1.2;
}

.page-about .plan__label {
  font-family: var(--font-display);
  font-size: 17px;
  font-weight: 700;
  fill: var(--c-ink);
}

.page-about .plan__num {
  font-family: var(--font-mono);
  font-size: 12.5px;
  fill: var(--c-gold-deep);
  letter-spacing: .01em;
}

.page-about .plan__cap {
  font-family: var(--font-body);
  font-size: 12px;
  fill: var(--c-qilian);
}

/* ---------- 团队 ---------- */
.page-about .team-list {
  list-style: none;
  margin: 26px 0 0;
  padding: 0;
  display: grid;
  gap: 18px;
}

.page-about .team-item {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  align-items: baseline;
  gap: 4px 12px;
}

.page-about .team-item__name {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 17px;
  color: var(--c-ink);
}

.page-about .team-item__num {
  margin-left: 8px;
  font-size: 14px;
  color: var(--c-ochre);
  font-weight: 500;
}

.page-about .team-item__note {
  font-size: 13px;
  color: var(--c-qilian);
  text-align: right;
}

.page-about .team-item__bar {
  grid-column: 1 / -1;
  display: block;
  height: 7px;
  background: rgba(43, 54, 59, .08);
  border-radius: 1px;
  overflow: hidden;
}

.page-about .team-item__fill {
  display: block;
  height: 100%;
}

.page-about .team-item__fill--info {
  width: 19.6%;
  background: linear-gradient(90deg, var(--c-gold), #d3a martin);
  background: linear-gradient(90deg, var(--c-gold), var(--c-lamp));
}

.page-about .team-item__fill--cs {
  width: 15.2%;
  background: linear-gradient(90deg, var(--c-qilian), #7d8f95);
}

.page-about .team-item__fill--stage {
  width: 39.1%;
  background: linear-gradient(90deg, var(--c-ochre), var(--c-danxia));
}

.page-about .team-item__fill--ops {
  width: 26.1%;
  background: linear-gradient(90deg, var(--c-danxia), #cf9a74);
}

.page-about .about-team__foot {
  margin: 22px 0 0;
  padding: 14px 16px;
  border-left: 3px solid var(--c-gold);
  background: rgba(228, 207, 175, .4);
  font-size: 14.5px;
  line-height: 1.8;
  color: #3f4f56;
}

/* ---------- 维护节奏 ---------- */
.page-about .cadence {
  margin-top: 26px;
  display: grid;
  gap: 1px;
  background: var(--about-line);
  border: 1px solid var(--about-line);
}

.page-about .cadence__item {
  padding: 18px 16px;
  background: var(--c-gravel);
}

.page-about .cadence__when {
  margin: 0;
  font-size: 12px;
  letter-spacing: .14em;
  color: var(--c-ochre);
}

.page-about .cadence__title {
  margin: 8px 0 8px;
  font-family: var(--font-display);
  font-size: 17.5px;
  font-weight: 700;
  line-height: 1.4;
  color: var(--c-ink);
}

.page-about .cadence__item p:last-child {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.8;
  color: #4a5a61;
}

.page-about .about-catalog__links {
  margin: 22px 0 0;
  font-size: 14.5px;
  line-height: 1.8;
  color: var(--c-qilian);
}

.page-about .about-catalog__links a {
  color: var(--c-gold-deep);
  text-decoration: none;
  border-bottom: 1px solid rgba(138, 94, 26, .4);
}

.page-about .about-catalog__links a:hover {
  color: var(--c-ochre);
  border-bottom-color: var(--c-ochre);
}

/* ---------- 服务范围 ---------- */
.page-about .coverage {
  margin-top: 26px;
  display: grid;
  gap: 18px;
}

.page-about .coverage__col {
  padding: 16px 0 4px;
  border-top: 2px solid var(--c-earth);
}

.page-about .coverage__col:nth-child(2) {
  border-top-color: var(--c-gold);
}

.page-about .coverage__col:nth-child(3) {
  border-top-color: var(--c-ochre);
}

.page-about .coverage__title {
  margin: 0 0 8px;
  font-family: var(--font-display);
  font-size: 17px;
  font-weight: 700;
  color: var(--c-ink);
}

.page-about .coverage__col p {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.82;
  color: #4a5a61;
}

/* ---------- 合作 ---------- */
.page-about .partners {
  margin-top: 26px;
  display: grid;
  gap: 22px;
}

.page-about .partners__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 12px;
}

.page-about .partners__list li {
  position: relative;
  padding-left: 20px;
  font-size: 15px;
  line-height: 1.8;
  color: #3f4f56;
}

.page-about .partners__list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 11px;
  width: 8px;
  height: 8px;
  background: var(--c-gold);
  transform: rotate(45deg);
}

.page-about .partners__num {
  font-size: 19px;
  color: var(--c-gold-deep);
  margin-right: 4px;
}

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

/* ---------- 下一步 ---------- */
.page-about .about-sec--next {
  border-top: 1px solid var(--about-line);
}

.page-about .next {
  margin-top: 22px;
  display: grid;
  gap: 18px;
}

.page-about .next__item {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 14px;
  align-items: start;
  padding: 16px;
  background: linear-gradient(120deg, rgba(228, 207, 175, .55), rgba(251, 246, 236, .9));
  border-radius: var(--radius);
}

.page-about .next__num {
  margin: 0;
  font-size: clamp(30px, 6vw, 44px);
  line-height: 1;
  color: var(--c-ochre);
  letter-spacing: -.03em;
}

.page-about .next__text {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.8;
  color: #3f4f56;
}

/* ---------- 结尾联系 ---------- */
.page-about .about-cta {
  margin-top: clamp(36px, 5vw, 56px);
  padding: clamp(26px, 4vw, 44px);
  border-radius: var(--radius);
  background:
    radial-gradient(120% 130% at 90% -20%, rgba(190, 138, 51, .3), rgba(190, 138, 51, 0) 60%),
    linear-gradient(160deg, #232b2e 0%, #171d20 100%);
  color: var(--c-sand);
}

.page-about .about-cta__grid {
  display: grid;
  gap: 28px;
}

.page-about .about-cta__title {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(23px, 3.4vw, 34px);
  line-height: 1.3;
  color: var(--c-sand);
}

.page-about .about-cta__lead {
  margin: 14px 0 0;
  max-width: 46ch;
  font-size: 15px;
  line-height: 1.82;
  color: rgba(244, 235, 221, .78);
}

.page-about .about-cta__actions {
  margin-top: 22px;
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.page-about .about-cta .btn--ghost {
  color: var(--c-sand);
  border-color: rgba(244, 235, 221, .42);
}

.page-about .about-cta .btn--ghost:hover {
  border-color: var(--c-lamp);
  color: var(--c-lamp);
}

.page-about .about-cta__contact {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 14px;
  border-top: 1px solid rgba(244, 235, 221, .16);
  padding-top: 20px;
}

.page-about .about-cta__contact .contact-line {
  display: grid;
  gap: 3px;
}

.page-about .about-cta__contact .contact-line__label {
  font-size: 11.5px;
  letter-spacing: .16em;
  color: var(--c-lamp);
}

.page-about .about-cta__contact .contact-line__value {
  font-size: 14.5px;
  line-height: 1.75;
  color: rgba(244, 235, 221, .88);
  word-break: break-word;
}

.page-about .about-cta__contact .copy-btn {
  margin-left: 8px;
  font-size: 12px;
  padding: 2px 8px;
  border: 1px solid rgba(244, 235, 221, .34);
  background: transparent;
  color: var(--c-sand);
  border-radius: var(--radius);
  cursor: pointer;
  transition: border-color .16s var(--ease), color .16s var(--ease);
}

.page-about .about-cta__contact .copy-btn:hover {
  border-color: var(--c-lamp);
  color: var(--c-lamp);
}

/* ---------- 桌面端 ---------- */
@media (min-width: 720px) {
  .page-about .about-intro {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
    align-items: start;
    gap: 28px;
  }

  .page-about .space-row {
    grid-template-columns: 170px 100px minmax(0, 1fr);
    align-items: baseline;
    padding: 16px 14px;
  }

  .page-about .space-row--head {
    display: grid;
    font-size: 11.5px;
    letter-spacing: .16em;
    color: var(--c-qilian);
    background: var(--c-earth);
    padding-top: 11px;
    padding-bottom: 11px;
  }

  .page-about .space-row__use {
    grid-column: auto;
  }

  .page-about .cadence {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .page-about .coverage {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 24px;
  }

  .page-about .partners {
    grid-template-columns: minmax(0, 5fr) minmax(0, 6fr);
    align-items: start;
    gap: 28px;
  }

  .page-about .next {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 22px;
  }

  .page-about .about-cta__grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    gap: 36px;
  }
}

@media (min-width: 1000px) {
  .page-about .about-layout {
    grid-template-columns: var(--about-rail-w) minmax(0, 1fr);
    gap: 0 48px;
    align-items: start;
  }

  .page-about .about-rail {
    flex-direction: column;
    align-items: stretch;
    gap: 2px;
    overflow: visible;
    border-bottom: 0;
    border-left: 1px solid var(--about-line);
    padding: 0 0 0 5px;
    position: sticky;
    top: calc(var(--header-h) + 20px);
  }

  .page-about .about-rail__cap {
    display: block;
    padding: 0 0 12px 6px;
    writing-mode: vertical-rl;
    letter-spacing: .18em;
    height: 82px;
  }

  .page-about .about-rail__link {
    padding: 8px 6px;
    font-size: 13px;
    gap: 5px;
  }

  .page-about .tl::before {
    left: 121px;
  }

  .page-about .tl__item {
    display: grid;
    grid-template-columns: 104px minmax(0, 1fr);
    gap: 0 30px;
    padding: 0 0 34px 0;
  }

  .page-about .tl__item::before {
    left: 114px;
    top: 14px;
  }

  .page-about .tl__year {
    font-size: clamp(34px, 3.6vw, 46px);
    text-align: right;
    padding-top: 4px;
    color: rgba(138, 94, 26, .82);
  }

  .page-about .tl__body {
    margin-top: 0;
  }

  .page-about .tl__item:nth-child(even) .tl__body {
    margin-left: 24px;
    max-width: 56ch;
  }

  .page-about .about-intro {
    grid-template-columns: minmax(0, 6fr) minmax(0, 5fr);
  }

  .page-about .about-sec__note {
    max-width: 60ch;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .plan__zone,
  .page-about .about-rail__link,
  .page-about .about-rail__num,
  .page-about .copy-btn {
    transition: none;
  }
}
<<<END>>>