.page-about {
  overflow-x: hidden;
  background: var(--ivory);
}

/* ---------- 首屏 ---------- */
.page-about .about-masthead {
  position: relative;
  padding: clamp(26px, 5vw, 52px) 0 clamp(44px, 8vw, 88px);
  background:
    radial-gradient(90% 130% at 88% -12%, var(--ink-evergreen) 0%, rgba(22, 68, 59, 0) 62%),
    var(--ink-deep);
  color: var(--sand);
  overflow: hidden;
}

.page-about .about-masthead::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image: repeating-linear-gradient(90deg, rgba(200, 164, 93, .09) 0 1px, transparent 1px 96px);
  pointer-events: none;
}

.page-about .about-masthead__inner {
  position: relative;
  z-index: 1;
  display: grid;
  gap: 18px;
}

.page-about .breadcrumbs {
  font-size: 12px;
  letter-spacing: .06em;
}

.page-about .breadcrumb-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 6px 0;
}

.page-about .breadcrumb-list li {
  display: inline-flex;
  align-items: center;
}

.page-about .breadcrumb-list li + li::before {
  content: "/";
  margin: 0 10px;
  color: rgba(200, 164, 93, .45);
}

.page-about .breadcrumb-list a {
  color: var(--gold);
  text-decoration: none;
}

.page-about .breadcrumb-list a:hover {
  color: var(--gold-amber);
}

.page-about .breadcrumb-list li[aria-current] {
  color: rgba(231, 218, 196, .7);
}

.page-about .about-masthead .eyebrow,
.page-about .about-collab .eyebrow,
.page-about .about-rhythm .eyebrow,
.page-about .about-next .eyebrow {
  color: var(--gold);
  letter-spacing: .18em;
}

.page-about .about-masthead__title {
  margin: 0;
  max-width: 15em;
  font-family: var(--font-serif);
  font-weight: 300;
  font-size: clamp(30px, 5.4vw, 66px);
  line-height: 1.14;
  letter-spacing: -.012em;
  color: var(--ivory);
}

.page-about .about-masthead__lede {
  margin: 0;
  max-width: 44em;
  font-family: var(--font-sans);
  font-size: clamp(15px, 1.5vw, 17.5px);
  line-height: 1.9;
  color: rgba(231, 218, 196, .84);
}

.page-about .about-masthead__facts {
  display: flex;
  flex-wrap: wrap;
  gap: 14px 22px;
  margin: clamp(8px, 2vw, 18px) 0 0;
  padding: 0;
}

.page-about .about-fact {
  min-width: 120px;
  padding-left: 14px;
  border-left: 1px solid rgba(200, 164, 93, .38);
}

.page-about .about-fact dt {
  margin-bottom: 6px;
  font-size: 11px;
  letter-spacing: .16em;
  color: rgba(231, 218, 196, .58);
}

.page-about .about-fact dd {
  margin: 0;
  font-size: 26px;
  line-height: 1.1;
  color: var(--gold);
}

.page-about .about-fact__text {
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.4;
  color: var(--sand);
}

/* ---------- 时间轴 ---------- */
.page-about .about-timeline {
  padding: clamp(40px, 7vw, 88px) 0 clamp(44px, 7vw, 84px);
  background: var(--sand);
  color: var(--charcoal);
}

.page-about .about-timeline__head {
  display: grid;
  gap: 14px;
  margin-bottom: clamp(22px, 4vw, 36px);
}

.page-about .about-timeline__head h2 {
  margin: 0;
  max-width: 20em;
  font-family: var(--font-serif);
  font-weight: 400;
  font-size: clamp(25px, 3.6vw, 42px);
  line-height: 1.24;
  color: var(--ink-deep);
}

.page-about .about-timeline__intro {
  margin: 0;
  max-width: 42em;
  font-size: 15px;
  line-height: 1.88;
  color: rgba(29, 31, 28, .76);
}

.page-about .about-timeline__figure {
  margin: 0 0 clamp(24px, 4vw, 44px);
  max-height: 260px;
  overflow: hidden;
  background: var(--ink-deep);
}

.page-about .about-timeline__figure img {
  display: block;
  width: 100%;
  height: 100%;
  max-height: 260px;
  object-fit: cover;
  opacity: .9;
}

.page-about .about-track {
  list-style: none;
  margin: 0;
  padding: 22px 0 12px;
  display: flex;
  gap: 16px;
  overflow-x: auto;
  scroll-snap-type: x mandatory;
  border-top: 1px solid rgba(200, 164, 93, .5);
  scrollbar-width: thin;
}

.page-about .about-track__item {
  position: relative;
  flex: 0 0 min(82vw, 320px);
  scroll-snap-align: start;
  display: grid;
  gap: 10px;
  align-content: start;
  overflow: hidden;
  padding: 20px 20px 24px;
  border: 1px solid rgba(200, 164, 93, .45);
  border-radius: var(--radius-md);
  background: var(--ivory);
}

.page-about .about-track__item::after {
  content: attr(data-step);
  position: absolute;
  right: 6px;
  bottom: -16px;
  font-family: var(--font-serif);
  font-size: 76px;
  line-height: 1;
  color: rgba(14, 47, 42, .06);
  pointer-events: none;
}

.page-about .about-track__stamp {
  display: inline-block;
  width: fit-content;
  padding-bottom: 4px;
  border-bottom: 1px solid rgba(138, 106, 42, .45);
  font-size: 12px;
  letter-spacing: .16em;
  color: var(--gold-deep);
}

.page-about .about-track__item h3 {
  position: relative;
  z-index: 1;
  margin: 0;
  font-family: var(--font-serif);
  font-weight: 500;
  font-size: 18.5px;
  line-height: 1.42;
  color: var(--ink-deep);
}

.page-about .about-track__item p {
  position: relative;
  z-index: 1;
  margin: 0;
  font-size: 14px;
  line-height: 1.82;
  color: rgba(29, 31, 28, .78);
}

/* ---------- 协作机制 ---------- */
.page-about .about-collab {
  padding: clamp(40px, 7vw, 88px) 0;
  background: var(--ink-evergreen);
  color: var(--sand);
}

.page-about .about-collab__head {
  display: grid;
  gap: 14px;
  margin-bottom: clamp(24px, 4vw, 42px);
}

.page-about .about-collab__head h2 {
  margin: 0;
  max-width: 18em;
  font-family: var(--font-serif);
  font-weight: 300;
  font-size: clamp(25px, 3.6vw, 42px);
  line-height: 1.24;
  color: var(--ivory);
}

.page-about .about-collab__intro {
  margin: 0;
  max-width: 40em;
  font-size: 15px;
  line-height: 1.88;
  color: rgba(231, 218, 196, .8);
}

.page-about .about-collab__grid {
  display: grid;
  gap: 26px;
  align-items: center;
}

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

.page-about .about-step {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 2px 14px;
  align-items: baseline;
  padding: 14px 16px;
  border: 1px solid rgba(200, 164, 93, .26);
  border-radius: var(--radius-md);
  transition: border-color .2s var(--ease), background-color .2s var(--ease);
}

.page-about .about-step:hover,
.page-about .about-step:focus-within {
  border-color: var(--gold);
  background: rgba(200, 164, 93, .08);
}

.page-about .about-step__idx {
  font-size: 12px;
  letter-spacing: .12em;
  color: var(--gold-amber);
}

.page-about .about-step h3 {
  margin: 0;
  font-family: var(--font-serif);
  font-weight: 500;
  font-size: 17px;
  color: var(--ivory);
}

.page-about .about-step p {
  grid-column: 2;
  margin: 4px 0 0;
  font-size: 13.5px;
  line-height: 1.78;
  color: rgba(231, 218, 196, .78);
}

.page-about .about-loop-wrap {
  display: grid;
  gap: 10px;
  justify-items: center;
}

.page-about .about-loop {
  display: block;
  width: 100%;
  max-width: 300px;
  height: auto;
}

.page-about .loop-ring {
  fill: none;
  stroke: rgba(200, 164, 93, .26);
  stroke-width: 1;
  stroke-dasharray: 3 10;
}

.page-about .loop-arc {
  fill: none;
  stroke: var(--gold-amber);
  stroke-width: 2;
  stroke-linecap: round;
}

.page-about .loop-node {
  fill: var(--ink-evergreen);
  stroke: var(--gold);
  stroke-width: 1.6;
}

.page-about .loop-node--accent {
  fill: var(--gold-amber);
  stroke: var(--gold-amber);
}

.page-about .about-loop-caption {
  margin: 0;
  font-size: 12px;
  letter-spacing: .1em;
  color: rgba(231, 218, 196, .62);
  text-align: center;
}

.page-about .about-crew {
  list-style: none;
  margin: clamp(28px, 4vw, 46px) 0 0;
  padding: 0;
  display: grid;
  gap: 16px;
}

.page-about .about-crew li {
  padding-top: 14px;
  border-top: 1px solid rgba(200, 164, 93, .34);
}

.page-about .about-crew h3 {
  margin: 0 0 6px;
  font-family: var(--font-serif);
  font-weight: 500;
  font-size: 18px;
  color: var(--gold);
}

.page-about .about-crew p {
  margin: 0;
  font-size: 14px;
  line-height: 1.82;
  color: rgba(231, 218, 196, .8);
}

/* ---------- 档案规模 ---------- */
.page-about .about-archive {
  padding: clamp(40px, 7vw, 88px) 0;
  background: var(--ivory);
  color: var(--charcoal);
}

.page-about .about-archive__head {
  display: grid;
  gap: 14px;
}

.page-about .about-archive__head h2 {
  margin: 0;
  max-width: 18em;
  font-family: var(--font-serif);
  font-weight: 400;
  font-size: clamp(25px, 3.6vw, 42px);
  line-height: 1.24;
  color: var(--ink-deep);
}

.page-about .about-archive__intro {
  margin: 0;
  max-width: 42em;
  font-size: 15px;
  line-height: 1.88;
  color: rgba(29, 31, 28, .76);
}

.page-about .about-wall {
  display: grid;
  gap: 14px;
  margin-top: clamp(24px, 4vw, 40px);
}

.page-about .about-slab {
  display: grid;
  gap: 6px;
  align-content: start;
  padding: 20px 20px 22px;
  border-radius: var(--radius-lg);
  border: 1px solid rgba(14, 47, 42, .1);
  border-left: 3px solid var(--gold);
  background: var(--sand);
  transition: transform .22s var(--ease), border-color .22s var(--ease);
}

.page-about .about-slab:hover {
  transform: translateY(-4px);
  border-color: var(--gold-amber);
  border-left-color: var(--gold-amber);
}

.page-about .about-slab__num {
  font-size: clamp(30px, 4.6vw, 42px);
  line-height: 1;
  letter-spacing: -.02em;
  color: var(--ink-deep);
}

.page-about .about-slab h3 {
  margin: 0;
  font-family: var(--font-sans);
  font-weight: 600;
  font-size: 15px;
  letter-spacing: .02em;
  color: var(--gold-deep);
}

.page-about .about-slab p {
  margin: 4px 0 0;
  font-size: 13.5px;
  line-height: 1.8;
  color: rgba(29, 31, 28, .76);
}

.page-about .about-archive__figure {
  margin: clamp(26px, 4vw, 42px) 0 0;
  overflow: hidden;
  border-radius: var(--radius-lg);
}

.page-about .about-archive__figure img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 3 / 2;
  object-fit: cover;
}

/* ---------- 适用场景 ---------- */
.page-about .about-audience {
  padding: clamp(40px, 7vw, 88px) 0 clamp(52px, 8vw, 100px);
  background: var(--sand);
  color: var(--charcoal);
}

.page-about .about-audience__title {
  margin: 12px 0 0;
  max-width: 18em;
  font-family: var(--font-serif);
  font-weight: 400;
  font-size: clamp(25px, 3.6vw, 40px);
  line-height: 1.24;
  color: var(--ink-deep);
}

.page-about .about-audience__grid {
  display: grid;
  gap: 26px;
  margin-top: clamp(24px, 4vw, 40px);
}

.page-about .about-audience__card {
  display: grid;
  gap: 10px;
  align-content: start;
  justify-items: start;
  padding: 4px 0 4px 20px;
  border-left: 2px solid var(--gold);
}

.page-about .about-audience__mark {
  font-size: 12px;
  letter-spacing: .18em;
  color: var(--gold-deep);
}

.page-about .about-audience__card h3 {
  margin: 0;
  font-family: var(--font-serif);
  font-weight: 500;
  font-size: 20px;
  line-height: 1.4;
  color: var(--ink-deep);
}

.page-about .about-audience__card p {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.86;
  color: rgba(29, 31, 28, .8);
}

.page-about .about-audience__card .btn {
  margin-top: 6px;
}

/* ---------- 维护节奏 ---------- */
.page-about .about-rhythm {
  padding: clamp(40px, 7vw, 88px) 0;
  background: var(--ink-night);
  color: var(--sand);
}

.page-about .about-rhythm__head {
  display: grid;
  gap: 14px;
}

.page-about .about-rhythm__head h2 {
  margin: 0;
  max-width: 18em;
  font-family: var(--font-serif);
  font-weight: 300;
  font-size: clamp(25px, 3.6vw, 42px);
  line-height: 1.24;
  color: var(--ivory);
}

.page-about .about-rhythm__intro {
  margin: 0;
  max-width: 40em;
  font-size: 15px;
  line-height: 1.88;
  color: rgba(231, 218, 196, .8);
}

.page-about .about-rhythm__body {
  display: grid;
  gap: 26px;
  margin-top: clamp(24px, 4vw, 40px);
}

.page-about .about-cadence {
  list-style: none;
  margin: 0;
  padding: 0;
}

.page-about .about-cadence li {
  display: grid;
  grid-template-columns: 62px minmax(0, 1fr);
  gap: 16px;
  padding: 18px 0;
  border-top: 1px solid rgba(200, 164, 93, .28);
}

.page-about .about-cadence li:last-child {
  border-bottom: 1px solid rgba(200, 164, 93, .28);
}

.page-about .about-cadence__label {
  padding-top: 3px;
  font-size: 13px;
  letter-spacing: .14em;
  color: var(--gold-amber);
}

.page-about .about-cadence h3 {
  margin: 0 0 6px;
  font-family: var(--font-serif);
  font-weight: 500;
  font-size: 17.5px;
  color: var(--ivory);
}

.page-about .about-cadence p {
  margin: 0;
  font-size: 14px;
  line-height: 1.82;
  color: rgba(231, 218, 196, .8);
}

.page-about .about-rhythm__figure {
  margin: 0;
  overflow: hidden;
  border-radius: var(--radius-lg);
}

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

/* ---------- 下一步 ---------- */
.page-about .about-next {
  padding: clamp(40px, 7vw, 84px) 0 clamp(46px, 7vw, 92px);
  background:
    radial-gradient(80% 120% at 10% 0%, var(--ink-evergreen) 0%, rgba(22, 68, 59, 0) 66%),
    var(--ink-deep);
  color: var(--sand);
}

.page-about .about-next__inner {
  display: grid;
  gap: 16px;
}

.page-about .about-next h2 {
  margin: 0;
  max-width: 16em;
  font-family: var(--font-serif);
  font-weight: 300;
  font-size: clamp(25px, 3.8vw, 44px);
  line-height: 1.24;
  color: var(--ivory);
}

.page-about .about-next__lede {
  margin: 0;
  max-width: 44em;
  font-size: 15px;
  line-height: 1.9;
  color: rgba(231, 218, 196, .82);
}

.page-about .about-next__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 4px;
}

.page-about .about-next__contact {
  list-style: none;
  margin: 14px 0 0;
  padding: 18px 0 0;
  display: grid;
  gap: 12px;
  border-top: 1px solid rgba(200, 164, 93, .3);
}

.page-about .about-next__contact .contact-item {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 6px 14px;
}

.page-about .about-next__contact .contact-label {
  min-width: 62px;
  font-size: 11px;
  letter-spacing: .16em;
  color: rgba(231, 218, 196, .58);
}

.page-about .about-next__contact .contact-value {
  font-size: 15px;
  color: var(--sand);
}

.page-about .about-next__contact .copy-btn {
  padding: 4px 14px;
  border: 1px solid rgba(200, 164, 93, .42);
  border-radius: var(--radius-pill);
  background: transparent;
  color: var(--gold);
  font-family: var(--font-sans);
  font-size: 12px;
  cursor: pointer;
  transition: border-color .2s var(--ease), color .2s var(--ease);
}

.page-about .about-next__contact .copy-btn:hover,
.page-about .about-next__contact .copy-btn[data-copied] {
  border-color: var(--gold-amber);
  color: var(--gold-amber);
}

.page-about .about-next__note {
  margin: 0;
  max-width: 46em;
  font-size: 12.5px;
  line-height: 1.8;
  color: rgba(231, 218, 196, .6);
}

/* ---------- 响应式 ---------- */
@media (max-width: 599px) {
  .page-about .about-track__item {
    flex-basis: 86vw;
  }

  .page-about .about-cadence li {
    grid-template-columns: minmax(0, 1fr);
    gap: 6px;
  }

  .page-about .about-step p {
    grid-column: 1 / -1;
  }

  .page-about .about-next__contact .contact-value {
    word-break: break-all;
  }
}

@media (min-width: 720px) {
  .page-about .about-crew {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 20px;
  }

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

  .page-about .about-audience__grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 28px;
  }

  .page-about .about-audience__card:nth-child(2) {
    transform: translateY(20px);
  }
}

@media (min-width: 900px) {
  .page-about .about-masthead__inner {
    grid-template-columns: minmax(0, 1fr);
    gap: 20px;
  }

  .page-about .about-timeline__figure {
    max-height: 320px;
  }

  .page-about .about-timeline__figure img {
    max-height: 320px;
  }

  .page-about .about-collab__grid {
    grid-template-columns: minmax(0, 1.15fr) minmax(0, .85fr);
    gap: 40px;
  }

  .page-about .about-rhythm__body {
    grid-template-columns: minmax(0, 1fr) minmax(0, .82fr);
    gap: 44px;
    align-items: start;
  }

  .page-about .about-slab {
    padding: 24px 24px 26px;
  }
}

@media (min-width: 1000px) {
  .page-about .about-wall {
    grid-template-columns: repeat(6, minmax(0, 1fr));
    gap: 16px;
  }

  .page-about .about-slab:nth-child(1),
  .page-about .about-slab:nth-child(2) {
    grid-column: span 3;
  }

  .page-about .about-slab:nth-child(3),
  .page-about .about-slab:nth-child(4),
  .page-about .about-slab:nth-child(5) {
    grid-column: span 2;
  }

  .page-about .about-slab:nth-child(6) {
    grid-column: span 6;
    border-left-width: 3px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-slab,
  .page-about .about-step {
    transition: none;
  }

  .page-about .about-slab:hover,
  .page-about .about-audience__card:nth-child(2) {
    transform: none;
  }
}
<<<PAGE_CSS_END>>>