.page-about {
  --about-rail-w: 168px;
  background: var(--ink);
  color: var(--cream);
  overflow-x: hidden;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  padding: clamp(20px, 3.4vw, 34px) 0 clamp(46px, 7vw, 92px);
  background:
    radial-gradient(120% 80% at 78% 8%, rgba(42, 48, 56, .9) 0%, rgba(14, 15, 12, 0) 62%),
    linear-gradient(180deg, var(--ink) 0%, var(--night) 58%, var(--ink) 100%);
  overflow: hidden;
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background-image:
    radial-gradient(circle, rgba(242, 237, 228, .55) 1px, transparent 1.4px),
    radial-gradient(circle, rgba(127, 211, 198, .38) 1px, transparent 1.6px);
  background-size: 130px 104px, 214px 168px;
  background-position: 22px 28px, 74px 86px;
  opacity: .55;
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background-image:
    linear-gradient(var(--line-soft) 1px, transparent 1px),
    linear-gradient(90deg, var(--line-soft) 1px, transparent 1px);
  background-size: 92px 92px;
  opacity: .55;
}

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

.page-about .breadcrumb {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .06em;
  color: var(--stone);
  margin-bottom: clamp(20px, 3.2vw, 38px);
}

.page-about .breadcrumb a {
  color: var(--stone);
  text-decoration: none;
  transition: color .25s;
}

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

.page-about .breadcrumb__sep {
  color: rgba(138, 140, 134, .5);
}

.page-about .about-hero__grid {
  display: grid;
  gap: clamp(24px, 4vw, 52px);
}

.page-about .about-hero__lead {
  max-width: 40ch;
}

.page-about .eyebrow {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .18em;
  color: var(--gold);
  margin: 0;
  text-transform: uppercase;
}

.page-about .about-hero h1 {
  font-family: var(--font-display);
  font-size: clamp(34px, 7.4vw, 66px);
  font-weight: 700;
  line-height: 1.06;
  letter-spacing: -.02em;
  color: var(--cream);
  margin: 14px 0 0;
  max-width: 90%;
}

.page-about .about-hero__intro {
  margin: clamp(16px, 2.4vw, 24px) 0 0;
  font-size: clamp(15px, 1.7vw, 17px);
  line-height: 1.85;
  color: rgba(242, 237, 228, .82);
}

.page-about .about-hero__facts {
  display: grid;
  gap: 12px;
  margin: clamp(24px, 3.4vw, 36px) 0 0;
  padding: 16px 0 0;
  border-top: 1px solid var(--line);
}

.page-about .about-hero__fact {
  display: flex;
  align-items: baseline;
  gap: 12px;
}

.page-about .about-hero__fact dt {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .14em;
  color: var(--stone);
  min-width: 42px;
}

.page-about .about-hero__fact dd {
  margin: 0;
  font-size: 14.5px;
  color: var(--cream);
}

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

.page-about .about-hero__figure::before {
  content: "";
  position: absolute;
  inset: 12px -12px -12px 12px;
  border: 1px solid rgba(201, 162, 39, .42);
  pointer-events: none;
}

.page-about .about-hero__figure img {
  position: relative;
  display: block;
  width: 100%;
  height: auto;
  max-width: 100%;
  object-fit: cover;
  background: var(--walnut);
}

.page-about .media__caption {
  font-family: var(--font-mono);
  font-size: 12px;
  line-height: 1.7;
  letter-spacing: .04em;
  color: var(--stone);
  margin-top: 12px;
}

/* ---------- 长文骨架 ---------- */
.page-about .about-body {
  padding: clamp(36px, 6vw, 78px) 0 clamp(52px, 8vw, 104px);
}

.page-about .about-body__grid {
  display: grid;
  gap: clamp(26px, 4vw, 44px);
}

.page-about .about-rail {
  align-self: start;
  border-top: 1px solid var(--line-soft);
  padding-top: 16px;
}

.page-about .about-rail__scale {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .16em;
  color: var(--stone);
  margin: 0 0 16px;
}

.page-about .chapter-rail__title {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .2em;
  color: var(--stone);
  margin: 0 0 12px;
  text-transform: uppercase;
}

.page-about .chapter-rail__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.page-about .chapter-rail__link {
  display: block;
  padding: 8px 0 8px 14px;
  border-left: 1px solid var(--line-soft);
  color: rgba(242, 237, 228, .62);
  text-decoration: none;
  font-size: 14px;
  line-height: 1.45;
  transition: color .25s, border-color .25s, background .25s;
}

.page-about .chapter-rail__link:hover {
  color: var(--cream);
  border-left-color: var(--clay);
}

.page-about .chapter-rail__link[data-active="true"] {
  color: var(--gold);
  border-left-color: var(--gold);
  background: linear-gradient(90deg, rgba(201, 162, 39, .14), transparent 80%);
}

/* ---------- 阶段标题带 ---------- */
.page-about .about-stage {
  margin-bottom: clamp(48px, 7.5vw, 94px);
}

.page-about .about-stage:last-of-type {
  margin-bottom: clamp(36px, 5vw, 60px);
}

.page-about .year-band {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 8px clamp(12px, 2vw, 22px);
  padding: 12px 0 14px;
  border-top: 2px solid var(--cinnabar);
  border-bottom: 1px solid var(--line-soft);
  margin-bottom: clamp(18px, 2.6vw, 28px);
}

.page-about .year-band__year {
  font-family: var(--font-mono);
  font-size: 12.5px;
  letter-spacing: .16em;
  color: var(--gold);
  white-space: nowrap;
}

.page-about .year-band__title {
  font-family: var(--font-display);
  font-size: clamp(23px, 3.6vw, 35px);
  font-weight: 700;
  line-height: 1.2;
  letter-spacing: -.01em;
  color: var(--cream);
  margin: 0;
}

.page-about .about-stage__lede {
  margin: 0 0 clamp(18px, 2.6vw, 26px);
  font-size: clamp(15px, 1.7vw, 17px);
  line-height: 1.85;
  color: rgba(242, 237, 228, .84);
  max-width: 66ch;
}

.page-about .about-stage__note {
  margin: clamp(20px, 3vw, 30px) 0 0;
  padding: 16px 18px;
  border-left: 2px solid var(--jade);
  background: linear-gradient(90deg, rgba(47, 143, 131, .14), transparent 92%);
  font-size: 14.5px;
  line-height: 1.8;
  color: rgba(242, 237, 228, .82);
}

.page-about .about-stage__body {
  max-width: 68ch;
}

.page-about .about-stage__body--tight {
  margin-top: clamp(22px, 3vw, 32px);
}

.page-about .about-stage__body p {
  margin: 0 0 1.15em;
  font-size: clamp(15.5px, 1.65vw, 17px);
  line-height: 1.88;
  color: rgba(242, 237, 228, .86);
}

.page-about .about-stage__body p:last-child {
  margin-bottom: 0;
}

/* ---------- 三条主线折叠块 ---------- */
.page-about .line-fold {
  border: 1px solid var(--line-soft);
  border-left: 2px solid var(--clay);
  background: linear-gradient(180deg, rgba(58, 42, 32, .58), rgba(14, 15, 12, .42));
  padding: 16px clamp(15px, 2.4vw, 24px) 18px;
  margin: 0 0 14px;
  transition: border-color .3s, background .3s;
}

.page-about .line-fold[data-open="true"] {
  border-left-color: var(--gold);
}

.page-about .line-fold .fold__head {
  display: block;
  width: auto;
  margin: 0 0 10px;
  padding: 0;
  background: none;
  border: 0;
  font-family: var(--font-display);
  font-size: clamp(17px, 2.05vw, 20px);
  font-weight: 700;
  line-height: 1.45;
  letter-spacing: .01em;
  color: var(--cream);
  text-align: left;
}

.page-about .line-fold .fold__body p {
  margin: 0;
  font-size: 15px;
  line-height: 1.82;
  color: rgba(242, 237, 228, .74);
  max-width: 62ch;
}

/* ---------- 团队方阵 ---------- */
.page-about .team-grid {
  display: grid;
  gap: 1px;
  background: var(--line-soft);
  border: 1px solid var(--line-soft);
  margin-top: clamp(20px, 2.8vw, 28px);
}

.page-about .team-cell {
  background: var(--ink);
  padding: clamp(18px, 2.6vw, 26px) clamp(16px, 2.2vw, 22px);
  transition: background .3s ease;
}

.page-about .team-cell:hover,
.page-about .team-cell:focus-within {
  background: var(--walnut);
}

.page-about .team-cell__num {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(30px, 5vw, 42px);
  line-height: 1;
  letter-spacing: -.02em;
  color: var(--gold);
}

.page-about .team-cell__role {
  font-family: var(--font-display);
  font-size: 17px;
  font-weight: 700;
  color: var(--cream);
  margin: 12px 0 8px;
}

.page-about .team-cell__desc {
  margin: 0;
  font-size: 14px;
  line-height: 1.78;
  color: rgba(242, 237, 228, .64);
}

.page-about .team-cell:hover .team-cell__desc {
  color: rgba(242, 237, 228, .88);
}

.page-about .step-axis {
  list-style: none;
  margin: clamp(24px, 3.4vw, 34px) 0 0;
  padding: 0;
  border-top: 1px solid var(--line-soft);
}

.page-about .step-axis__item {
  display: grid;
  grid-template-columns: 62px minmax(0, 1fr);
  gap: 14px;
  align-items: baseline;
  padding: 13px 0;
  border-bottom: 1px solid var(--line-soft);
}

.page-about .step-axis__idx {
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: .12em;
  color: var(--clay);
}

.page-about .step-axis__text {
  font-size: 15px;
  line-height: 1.72;
  color: rgba(242, 237, 228, .82);
}

/* ---------- 校对流程 ---------- */
.page-about .quality-grid {
  display: grid;
  gap: clamp(20px, 3.2vw, 36px);
}

.page-about .quality-figure {
  margin: 0;
}

.page-about .quality-figure img {
  display: block;
  width: 100%;
  height: auto;
  max-width: 100%;
  object-fit: cover;
  background: var(--walnut);
  border: 1px solid var(--line-soft);
}

/* ---------- 合作生态 ---------- */
.page-about .eco-grid {
  display: grid;
  gap: 1px;
  margin-top: clamp(20px, 2.8vw, 28px);
  background: rgba(242, 237, 228, .12);
  border: 1px solid rgba(242, 237, 228, .12);
}

.page-about .eco-cell {
  background: var(--moss);
  color: var(--cream);
  padding: clamp(18px, 2.6vw, 26px) clamp(16px, 2.2vw, 22px);
}

.page-about .eco-cell__num {
  margin: 0;
  font-size: 13px;
  letter-spacing: .14em;
  color: rgba(242, 237, 228, .78);
}

.page-about .eco-cell__title {
  font-family: var(--font-display);
  font-size: 18px;
  font-weight: 700;
  color: var(--cream);
  margin: 10px 0 8px;
}

.page-about .eco-cell__desc {
  margin: 0;
  font-size: 14px;
  line-height: 1.78;
  color: rgba(242, 237, 228, .82);
}

/* ---------- 荣誉与覆盖 ---------- */
.page-about .honor-list {
  list-style: none;
  margin: clamp(20px, 2.8vw, 28px) 0 0;
  padding: 0;
}

.page-about .honor-list__item {
  display: grid;
  grid-template-columns: 46px minmax(0, 1fr);
  gap: 16px;
  align-items: baseline;
  padding: 14px 0;
  border-top: 1px solid var(--line-soft);
  transition: background .3s;
}

.page-about .honor-list__item:last-child {
  border-bottom: 1px solid var(--line-soft);
}

.page-about .honor-list__item:hover {
  background: rgba(58, 42, 32, .38);
}

.page-about .honor-list__idx {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .14em;
  color: var(--stone);
  transition: color .3s;
}

.page-about .honor-list__item:hover .honor-list__idx {
  color: var(--gold);
}

.page-about .honor-list__text {
  font-size: 15.5px;
  line-height: 1.62;
  color: var(--cream);
}

.page-about .scope-band {
  margin: clamp(30px, 4.6vw, 50px) 0 0;
  padding: 0;
}

.page-about .scope-band img {
  display: block;
  width: 100%;
  height: auto;
  max-width: 100%;
  object-fit: cover;
  background: var(--night);
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}

.page-about .scope-band .media__caption {
  padding-top: 10px;
}

/* ---------- 结尾 CTA ---------- */
.page-about .about-cta {
  border-top: 2px solid var(--cinnabar);
  padding-top: clamp(22px, 3vw, 32px);
}

.page-about .about-cta__title {
  font-family: var(--font-display);
  font-size: clamp(22px, 3.2vw, 32px);
  font-weight: 700;
  line-height: 1.25;
  letter-spacing: -.01em;
  color: var(--cream);
  margin: 0;
}

.page-about .about-cta__text {
  margin: 14px 0 0;
  max-width: 60ch;
  font-size: 15.5px;
  line-height: 1.82;
  color: rgba(242, 237, 228, .78);
}

.page-about .about-cta__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: clamp(20px, 2.8vw, 28px);
}

/* ---------- 响应式 ---------- */
@media (min-width: 700px) {
  .page-about .about-hero__facts {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 16px;
  }

  .page-about .about-hero__fact {
    flex-direction: column;
    align-items: flex-start;
    gap: 6px;
  }

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

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

@media (min-width: 900px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 1.18fr) minmax(0, .82fr);
    align-items: end;
    gap: clamp(32px, 5vw, 72px);
  }

  .page-about .about-hero__figure {
    padding-bottom: 18px;
  }

  .page-about .quality-grid {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1.02fr);
    align-items: start;
  }
}

@media (min-width: 1024px) {
  .page-about .about-body__grid {
    grid-template-columns: var(--about-rail-w) minmax(0, 1fr);
    column-gap: clamp(32px, 4.5vw, 76px);
  }

  .page-about .about-rail {
    position: sticky;
    top: calc(var(--header-h) + 22px);
    max-height: calc(100vh - var(--header-h) - 48px);
    overflow-y: auto;
  }

  .page-about .about-rail__scale {
    line-height: 1.7;
    letter-spacing: .12em;
  }
}

@media (max-width: 760px) {
  .page-about .scope-band img {
    height: 190px;
  }

  .page-about .about-hero__figure::before {
    inset: 8px -8px -8px 8px;
  }

  .page-about .step-axis__item {
    grid-template-columns: 54px minmax(0, 1fr);
    gap: 10px;
  }
}

@media (max-width: 420px) {
  .page-about .about-hero h1 {
    max-width: 100%;
  }

  .page-about .scope-band img {
    height: 150px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .team-cell,
  .page-about .honor-list__item,
  .page-about .chapter-rail__link,
  .page-about .line-fold {
    transition: none;
  }
}
</main>