.page-about {
  --about-ink-soft: rgba(15, 46, 40, 0.74);
  --about-gold-soft: rgba(200, 160, 60, 0.42);
  position: relative;
  color: var(--ink);
  background-color: var(--paper);
  background-image:
    radial-gradient(680px 420px at 94% -6%, rgba(200, 160, 60, 0.16), transparent 72%),
    radial-gradient(520px 400px at 0% 28%, rgba(94, 158, 127, 0.13), transparent 74%);
  background-repeat: no-repeat;
}

.page-about .about-body {
  padding-block: clamp(16px, 2.4vw, 26px) clamp(48px, 7vw, 96px);
}

/* ---------- 面包屑 ---------- */
.page-about .breadcrumbs ol {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin: 0;
  padding: 0;
  list-style: none;
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--graphite);
}

.page-about .breadcrumbs a {
  color: var(--teal);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: border-color 0.18s var(--ease);
}

.page-about .breadcrumbs a:hover,
.page-about .breadcrumbs a:focus-visible {
  border-bottom-color: var(--gold);
}

.page-about .breadcrumbs li + li::before {
  content: "/";
  margin-right: 6px;
  color: var(--edge);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  display: grid;
  gap: clamp(20px, 3.4vw, 40px);
  margin-top: clamp(16px, 2.6vw, 30px);
  padding-bottom: clamp(26px, 4vw, 46px);
  border-bottom: 1px solid var(--edge);
}

.page-about .about-hero__kicker {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.16em;
  color: var(--teal);
}

.page-about .about-hero h1 {
  margin: 12px 0 16px;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(38px, 6vw, 72px);
  line-height: 1.05;
  letter-spacing: -0.02em;
}

.page-about .about-hero h1 .hl {
  box-shadow: inset 0 -0.16em 0 var(--gold-hi);
}

.page-about .about-hero__lead {
  margin: 0;
  max-width: 60ch;
  font-size: clamp(16px, 1.5vw, 18px);
  line-height: 1.75;
}

.page-about .about-hero__sub {
  margin: 14px 0 0;
  max-width: 58ch;
  font-size: 15px;
  line-height: 1.8;
  color: var(--about-ink-soft);
}

.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 22px;
}

.page-about .about-hero__meta {
  margin: 16px 0 0;
  color: var(--graphite);
  letter-spacing: 0.06em;
}

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

.page-about .about-hero__figure img {
  display: block;
  width: 100%;
  height: auto;
  border: 1px solid var(--ink);
}

.page-about .about-hero__figure figcaption {
  margin-top: 8px;
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--graphite);
}

.page-about .about-hero__note {
  display: none;
}

/* ---------- 通用章节 ---------- */
.page-about .about-section {
  margin-top: clamp(38px, 5vw, 72px);
  scroll-margin-top: calc(var(--cmd-h) + 24px);
}

.page-about .about-h2 {
  margin: 0 0 14px;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(24px, 3vw, 34px);
  line-height: 1.2;
  letter-spacing: -0.01em;
}

.page-about .about-h2__num {
  display: block;
  margin-bottom: 8px;
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 500;
  letter-spacing: 0.26em;
  color: var(--gold);
}

.page-about .about-h2__num::after {
  content: "";
  display: inline-block;
  width: 34px;
  height: 1px;
  margin-left: 10px;
  vertical-align: middle;
  background: var(--gold);
}

.page-about .about-lede {
  margin: 0 0 18px;
  max-width: 62ch;
  font-size: 16px;
  line-height: 1.7;
  color: var(--about-ink-soft);
}

.page-about .about-prose p {
  margin: 0 0 14px;
  max-width: 70ch;
  font-size: 16px;
  line-height: 1.78;
}

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

/* ---------- 阶段时间线 ---------- */
.page-about .stages {
  display: grid;
  gap: clamp(18px, 3vw, 34px);
}

.page-about .stage-index {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.page-about .stage-index__item {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 7px 11px;
  border: 1px solid var(--edge);
  border-radius: 2px;
  background: var(--card);
  color: var(--ink);
  text-decoration: none;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.06em;
  transition: border-color 0.18s var(--ease), color 0.18s var(--ease);
}

.page-about .stage-index__item:hover,
.page-about .stage-index__item:focus-visible {
  border-color: var(--gold);
  color: var(--teal);
}

.page-about .stage-index__num {
  color: var(--gold);
}

.page-about .stage-list {
  display: grid;
  gap: clamp(16px, 2.4vw, 26px);
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .stage {
  scroll-margin-top: calc(var(--cmd-h) + 24px);
}

.page-about .stage-card {
  padding: clamp(16px, 2.4vw, 24px);
  border: 1px solid var(--ink);
  border-radius: 2px;
  background: var(--card);
  box-shadow: 7px 7px 0 var(--edge);
  transition: transform 0.18s var(--ease), box-shadow 0.18s var(--ease);
}

.page-about .stage-card:hover {
  transform: translateY(-6px);
  box-shadow: 7px 7px 0 var(--gold);
}

.page-about .stage-card h3 {
  margin: 8px 0 10px;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: 20px;
  line-height: 1.4;
}

.page-about .stage-card p {
  margin: 0 0 12px;
  font-size: 15px;
  line-height: 1.75;
}

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

.page-about .stage-card__scale {
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.04em;
  color: var(--teal);
  padding-top: 10px;
  border-top: 1px dashed var(--edge);
}

.page-about .stage--figure .figure-frame {
  margin: 0;
}

.page-about .stage--figure img {
  display: block;
  width: 100%;
  height: auto;
  border: 1px solid var(--ink);
}

.page-about .stage--figure figcaption {
  margin-top: 8px;
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--graphite);
}

/* ---------- 三条规矩 ---------- */
.page-about .principles {
  display: grid;
  gap: 16px;
}

.page-about .principle {
  padding: clamp(18px, 2.4vw, 24px);
  border: 1px solid var(--ink);
  border-radius: 2px;
  background: var(--card);
  box-shadow: 5px 5px 0 var(--edge);
  transition: transform 0.18s var(--ease), box-shadow 0.18s var(--ease);
}

.page-about .principle:hover,
.page-about .principle:focus-within {
  transform: translateY(-6px);
  box-shadow: 5px 5px 0 var(--gold);
}

.page-about .principle h3 {
  margin: 12px 0 10px;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: 20px;
  line-height: 1.4;
}

.page-about .principle p {
  margin: 0 0 10px;
  font-size: 15px;
  line-height: 1.75;
}

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

.page-about .principle__more {
  font-size: 14px;
  line-height: 1.7;
  color: var(--about-ink-soft);
  padding-top: 12px;
  border-top: 1px dashed var(--edge);
}

/* ---------- 团队 ---------- */
.page-about .team-grid {
  display: grid;
  gap: clamp(20px, 3vw, 34px);
}

.page-about .team-list {
  display: grid;
  gap: 16px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .team-list li {
  padding-left: 14px;
  border-left: 3px solid var(--cabbage);
}

.page-about .team-list h3 {
  margin: 0 0 6px;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: 18px;
  line-height: 1.4;
}

.page-about .team-list p {
  margin: 0;
  font-size: 15px;
  line-height: 1.75;
  color: var(--about-ink-soft);
}

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

.page-about .team-grid__figure img {
  display: block;
  width: 100%;
  height: auto;
  border: 1px solid var(--ink);
}

.page-about .team-grid__figure figcaption {
  margin-top: 8px;
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--graphite);
}

/* ---------- 数字带 ---------- */
.page-about .numbers {
  padding: clamp(22px, 3.4vw, 40px);
  border-radius: 2px;
  background: var(--ink);
  color: var(--paper);
  box-shadow: inset 0 0 0 1px var(--gold);
}

.page-about .numbers__grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 18px 16px;
}

.page-about .numbers__num {
  margin: 0 0 6px;
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: clamp(24px, 3.4vw, 38px);
  line-height: 1.1;
  color: var(--gold-hi);
}

.page-about .numbers__label {
  margin: 0;
  font-size: 13px;
  line-height: 1.5;
  color: rgba(248, 242, 228, 0.72);
}

/* ---------- 收束 ---------- */
.page-about .about-cta {
  display: grid;
  gap: 18px;
  margin-top: clamp(34px, 4.6vw, 60px);
  padding: clamp(20px, 3vw, 36px);
  border: 1px solid var(--ink);
  border-radius: 2px;
  background-image: linear-gradient(135deg, rgba(200, 160, 60, 0.18), rgba(94, 158, 127, 0.16));
  background-color: var(--card);
}

.page-about .about-cta__title {
  margin: 0 0 10px;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(22px, 2.6vw, 30px);
  line-height: 1.25;
}

.page-about .about-cta__text p {
  margin: 0;
  max-width: 62ch;
  font-size: 15px;
  line-height: 1.78;
  color: var(--about-ink-soft);
}

.page-about .about-cta__links {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

/* ---------- 平板与桌面 ---------- */
@media (min-width: 760px) {
  .page-about .numbers__grid {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 8px;
  }

  .page-about .numbers__item + .numbers__item {
    padding-left: 18px;
    border-left: 1px solid var(--about-gold-soft);
  }

  .page-about .about-cta {
    grid-template-columns: minmax(0, 1fr) auto;
    align-items: center;
  }

  .page-about .about-cta__links {
    justify-content: flex-end;
  }
}

@media (min-width: 900px) {
  .page-about .principles {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    align-items: start;
    gap: 18px;
  }

  .page-about .principle:nth-child(2) {
    margin-top: 22px;
  }

  .page-about .principle:nth-child(3) {
    margin-top: 44px;
  }

  .page-about .team-grid {
    grid-template-columns: minmax(0, 1.1fr) minmax(0, 0.9fr);
    align-items: center;
  }
}

@media (min-width: 1024px) {
  .page-about .about-hero {
    grid-template-columns: 7fr 5fr;
    align-items: end;
  }

  .page-about .about-hero__text {
    grid-column: 1;
  }

  .page-about .about-hero__figure {
    grid-column: 2;
    margin-right: 34px;
  }

  .page-about .about-hero__note {
    display: block;
    position: absolute;
    top: 2px;
    right: 0;
    padding-bottom: 6px;
    writing-mode: vertical-rl;
    font-family: var(--font-mono);
    font-size: 11px;
    letter-spacing: 0.22em;
    color: var(--graphite);
  }

  .page-about .stages {
    grid-template-columns: 168px minmax(0, 1fr);
    align-items: start;
  }

  .page-about .stage-index {
    position: sticky;
    top: calc(var(--cmd-h) + 28px);
    flex-direction: column;
    flex-wrap: nowrap;
    gap: 0;
    padding-left: 2px;
    border-left: 2px solid var(--ink);
  }

  .page-about .stage-index__item {
    position: relative;
    padding: 13px 0 13px 18px;
    border: 0;
    border-radius: 0;
    background: transparent;
    font-size: 12px;
    letter-spacing: 0.1em;
  }

  .page-about .stage-index__item::before {
    content: "";
    position: absolute;
    left: -9px;
    top: 50%;
    width: 12px;
    height: 12px;
    border-radius: 50%;
    background: var(--card);
    border: 2px solid var(--gold);
    transform: translateY(-50%);
    transition: transform 0.18s var(--ease), background-color 0.18s var(--ease);
  }

  .page-about .stage-index__item:hover::before,
  .page-about .stage-index__item:focus-visible::before {
    transform: translateY(-50%) scale(1.15);
    background: var(--gold-hi);
  }

  .page-about .stage-list {
    gap: 30px;
  }

  .page-about .stage-list > li:nth-child(even) .stage-card {
    margin-left: 32px;
  }

  .page-about .stage-list > li:nth-child(4) .stage-card {
    margin-left: 14px;
  }
}

@media (min-width: 1024px) and (hover: hover) {
  .page-about .principle__more {
    max-height: 0;
    margin-top: 0;
    padding-top: 0;
    overflow: hidden;
    opacity: 0;
    border-top-color: transparent;
    transition: max-height 0.24s var(--ease), opacity 0.24s var(--ease),
      padding-top 0.24s var(--ease), margin-top 0.24s var(--ease);
  }

  .page-about .principle:hover .principle__more,
  .page-about .principle:focus-within .principle__more {
    max-height: 240px;
    margin-top: 0;
    padding-top: 12px;
    opacity: 1;
    border-top-color: var(--edge);
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .stage-card,
  .page-about .principle,
  .page-about .stage-index__item,
  .page-about .stage-index__item::before {
    transition: none;
  }

  .page-about .stage-card:hover,
  .page-about .principle:hover,
  .page-about .principle:focus-within {
    transform: none;
  }

  .page-about .stage-index__item:hover::before,
  .page-about .stage-index__item:focus-visible::before {
    transform: translateY(-50%);
  }
}
<<<END>>>