.page-about {
  --pa-hair: var(--line-ink);
  --pa-hair-strong: var(--line-ink-strong);
  --pa-hair-light: var(--line-light-strong);
  --pa-text-soft: rgba(36, 26, 20, 0.74);
  --pa-text-light: rgba(244, 235, 221, 0.8);
  padding-bottom: 8px;
}

/* ---------- 首屏框景 ---------- */
.page-about .pa-hero {
  position: relative;
  overflow: hidden;
  border-radius: var(--radius-lg);
  padding: 26px 20px 42px;
  color: var(--paper);
  background:
    radial-gradient(120% 78% at 12% 0%, rgba(87, 242, 176, 0.16), transparent 62%),
    radial-gradient(92% 64% at 92% 102%, rgba(255, 138, 61, 0.2), transparent 66%),
    linear-gradient(178deg, var(--green-void) 0%, var(--green-deep) 100%);
}

.page-about .pa-hero::before {
  content: "";
  position: absolute;
  inset: 12px;
  border: 1px solid var(--pa-hair-light);
  border-radius: calc(var(--radius-lg) - 10px);
  pointer-events: none;
}

.page-about .pa-hero::after {
  content: "";
  position: absolute;
  left: 20px;
  right: 20px;
  bottom: 14px;
  height: 8px;
  background: repeating-linear-gradient(90deg, var(--pa-hair-light) 0 1px, transparent 1px 16px);
  opacity: 0.7;
  pointer-events: none;
}

.page-about .pa-hero__inner {
  position: relative;
  z-index: 1;
  max-width: 62ch;
}

.page-about .pa-hero .crumbs {
  margin-bottom: 26px;
}

.page-about .pa-hero .crumbs ol {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  list-style: none;
  margin: 0;
  padding: 0;
  font-family: var(--font-mono);
  font-size: 12px;
  color: rgba(244, 235, 221, 0.62);
}

.page-about .pa-hero .crumbs a {
  color: var(--mint-mist);
  text-decoration: none;
}

.page-about .pa-hero .crumbs a:hover,
.page-about .pa-hero .crumbs a:focus-visible {
  text-decoration: underline;
  text-underline-offset: 3px;
}

.page-about .pa-hero .eyebrow {
  margin: 0 0 14px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.12em;
  color: var(--orange);
  text-transform: uppercase;
}

.page-about .pa-hero h1 {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(30px, 8.4vw, 62px);
  line-height: 1.08;
  letter-spacing: -0.01em;
  color: var(--paper);
}

.page-about .pa-hero__lead {
  margin: 18px 0 0;
  font-size: 15px;
  line-height: 1.8;
  color: var(--pa-text-light);
  max-width: 44ch;
}

.page-about .pa-metrics {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 18px 14px;
  margin: 28px 0 0;
  padding: 22px 0 0;
  list-style: none;
  border-top: 1px solid var(--pa-hair-light);
}

.page-about .pa-metrics b {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(22px, 6vw, 30px);
  font-weight: 600;
  letter-spacing: -0.02em;
  color: var(--mint);
  font-variant-numeric: tabular-nums;
}

.page-about .pa-metrics span {
  display: block;
  margin-top: 4px;
  font-size: 12px;
  letter-spacing: 0.04em;
  color: rgba(244, 235, 221, 0.68);
}

/* ---------- 主体与侧边索引 ---------- */
.page-about .pa-body {
  display: grid;
  gap: 30px;
  padding-top: 34px;
}

.page-about .pa-rail__label {
  margin: 0 0 12px;
  font-size: 11px;
  letter-spacing: 0.16em;
  color: rgba(36, 26, 20, 0.5);
}

.page-about .pa-rail__list {
  display: flex;
  gap: 8px;
  margin: 0;
  padding: 0 0 6px;
  list-style: none;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
}

.page-about .pa-rail__list li {
  flex: 0 0 auto;
}

.page-about .pa-rail__list a {
  display: block;
  white-space: nowrap;
  padding: 8px 14px;
  border: 1px solid var(--pa-hair);
  border-radius: var(--pill);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.03em;
  color: rgba(36, 26, 20, 0.66);
  text-decoration: none;
  transition: color 160ms var(--ease), border-color 160ms var(--ease), background-color 160ms var(--ease);
}

.page-about .pa-rail__list a:hover,
.page-about .pa-rail__list a:focus-visible {
  color: var(--ink);
  border-color: var(--pa-hair-strong);
}

.page-about .pa-rail__list a.is-current {
  color: var(--ink);
  font-weight: 600;
  border-color: var(--green-mid);
  background: var(--paper-warm);
}

/* ---------- 章节通用 ---------- */
.page-about .pa-main {
  min-width: 0;
}

.page-about .pa-sec {
  padding: 34px 0;
  border-top: 1px solid var(--pa-hair);
}

.page-about .pa-sec:first-child {
  border-top: 0;
  padding-top: 0;
}

.page-about .pa-sec__index {
  margin: 0 0 12px;
  font-size: 11px;
  letter-spacing: 0.16em;
  color: var(--orange);
}

.page-about .pa-sec h2 {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(24px, 5.4vw, 38px);
  line-height: 1.2;
  letter-spacing: -0.01em;
  color: var(--ink);
}

.page-about .pa-sec h3 {
  margin: 0 0 8px;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 18px;
  line-height: 1.35;
  color: var(--ink);
}

.page-about .pa-sec p {
  margin: 14px 0 0;
  font-size: 15px;
  line-height: 1.8;
  color: var(--pa-text-soft);
}

.page-about .pa-sec__lead {
  color: var(--ink);
  font-size: 16px;
}

.page-about .pa-sec a {
  color: var(--green-mid);
  text-decoration: none;
  border-bottom: 1px solid rgba(29, 127, 99, 0.35);
}

.page-about .pa-sec a:hover,
.page-about .pa-sec a:focus-visible {
  color: var(--ink);
  border-bottom-color: var(--ink);
}

.page-about .pa-sec__tail {
  margin-top: 22px !important;
  padding-top: 16px;
  border-top: 1px dashed var(--pa-hair);
  font-size: 14px !important;
}

/* ---------- 图文与旁注 ---------- */
.page-about .pa-figure {
  margin: 24px 0 0;
}

.page-about .pa-figure .figure__media {
  border-radius: var(--radius-md);
  overflow: hidden;
  border: 1px solid var(--pa-hair);
}

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

.page-about .pa-figure .figure__caption {
  margin-top: 10px;
  font-family: var(--font-serif);
  font-size: 13px;
  line-height: 1.7;
  color: rgba(36, 26, 20, 0.6);
}

.page-about .pa-split {
  display: grid;
  gap: 20px;
  margin-top: 24px;
}

.page-about .pa-split--tight {
  margin-top: 26px;
}

.page-about .pa-note {
  border: 1px solid var(--pa-hair);
  border-radius: var(--radius-md);
  background: var(--paper-warm);
  padding: 18px;
}

.page-about .pa-note p {
  margin: 0;
  font-size: 14px;
  line-height: 1.8;
  color: var(--pa-text-soft);
}

.page-about .pa-note__title {
  margin: 0 0 8px !important;
  font-family: var(--font-serif);
  font-size: 13px !important;
  letter-spacing: 0.1em;
  color: var(--ink) !important;
}

.page-about .pa-note--figure {
  padding: 12px;
  background: var(--paper-warm);
}

.page-about .pa-note--figure .figure {
  margin: 0;
}

.page-about .pa-note--figure .figure__media {
  border-radius: var(--radius-sm);
  overflow: hidden;
}

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

.page-about .pa-note--figure .figure__caption {
  margin-top: 10px;
  padding: 0 4px 4px;
  font-family: var(--font-serif);
  font-size: 12px;
  line-height: 1.7;
  color: rgba(36, 26, 20, 0.62);
}

/* ---------- 团队角色 ---------- */
.page-about .pa-roles {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
  margin: 24px 0 0;
  padding: 0;
  list-style: none;
}

.page-about .pa-role {
  display: flex;
  flex-direction: column;
  gap: 4px;
  padding: 16px;
  border: 1px solid var(--pa-hair);
  border-radius: var(--radius-md);
  background: var(--paper-warm);
}

.page-about .pa-role__num {
  font-size: 26px;
  font-weight: 600;
  line-height: 1;
  color: var(--green-mid);
  font-variant-numeric: tabular-nums;
}

.page-about .pa-role__name {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 15px;
  color: var(--ink);
}

.page-about .pa-role__desc {
  font-size: 13px;
  line-height: 1.7;
  color: rgba(36, 26, 20, 0.66);
}

/* ---------- 深色章节 ---------- */
.page-about .pa-sec--dark {
  border-top: 0;
  margin: 10px 0;
  padding: 30px 20px 34px;
  border-radius: var(--radius-lg);
  color: var(--paper);
  background:
    radial-gradient(110% 70% at 88% 0%, rgba(87, 242, 176, 0.14), transparent 60%),
    linear-gradient(172deg, var(--green-void), var(--green-deep));
}

.page-about .pa-sec--dark h2 {
  color: var(--paper);
}

.page-about .pa-sec--dark h3 {
  color: var(--mint-mist);
}

.page-about .pa-sec--dark p {
  color: var(--pa-text-light);
}

.page-about .pa-sec--dark .pa-sec__lead {
  color: rgba(244, 235, 221, 0.95);
}

.page-about .pa-sec--dark .pa-sec__index {
  color: var(--orange);
}

.page-about .pa-sec--dark a {
  color: var(--mint);
  border-bottom-color: rgba(87, 242, 176, 0.4);
}

.page-about .pa-sec--dark a:hover,
.page-about .pa-sec--dark a:focus-visible {
  color: var(--mint-mist);
  border-bottom-color: var(--mint-mist);
}

.page-about .pa-sec__tail a {
  white-space: nowrap;
}

/* ---------- 版本阶段手风琴 ---------- */
.page-about .pa-stages {
  margin-top: 24px;
  display: grid;
  gap: 10px;
}

.page-about .pa-stage {
  border: 1px solid var(--pa-hair-light);
  border-radius: var(--radius-md);
  background: rgba(244, 235, 221, 0.05);
  overflow: hidden;
}

.page-about .pa-stage summary {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 14px 16px;
  cursor: pointer;
  list-style: none;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 15px;
  color: var(--paper);
}

.page-about .pa-stage summary::-webkit-details-marker {
  display: none;
}

.page-about .pa-stage summary::after {
  content: "＋";
  margin-left: auto;
  font-family: var(--font-mono);
  font-size: 14px;
  color: var(--mint);
}

.page-about .pa-stage[open] summary::after {
  content: "－";
}

.page-about .pa-stage summary:focus-visible {
  outline: 2px solid var(--mint);
  outline-offset: -2px;
}

.page-about .pa-stage__no {
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--orange);
}

.page-about .pa-stage__body {
  padding: 0 16px 16px 16px;
}

.page-about .pa-stage__body p {
  margin: 0;
  font-size: 14px;
  line-height: 1.8;
  color: rgba(244, 235, 221, 0.8);
}

.page-about .pa-figure--dark {
  margin-top: 26px;
}

.page-about .pa-figure--dark .figure__media {
  border-color: var(--pa-hair-light);
}

.page-about .pa-figure--dark .figure__caption {
  color: rgba(244, 235, 221, 0.66);
}

/* ---------- 12 项目录 ---------- */
.page-about .pa-dims {
  display: grid;
  grid-template-columns: 1fr;
  margin: 22px 0 0;
  padding: 0;
  list-style: none;
  border-top: 1px solid var(--pa-hair);
}

.page-about .pa-dims li {
  display: grid;
  grid-template-columns: 34px minmax(0, 1fr);
  gap: 2px 12px;
  padding: 14px 0;
  border-bottom: 1px solid var(--pa-hair);
}

.page-about .pa-dims__num {
  grid-row: 1 / span 2;
  font-size: 12px;
  letter-spacing: 0.04em;
  color: var(--orange);
  padding-top: 3px;
}

.page-about .pa-dims__name {
  display: flex;
  align-items: center;
  gap: 6px;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 15px;
  color: var(--ink);
}

.page-about .pa-dims__desc {
  font-size: 13px;
  line-height: 1.7;
  color: rgba(36, 26, 20, 0.66);
}

.page-about .pa-dot {
  display: inline-block;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  margin-left: 2px;
}

.page-about .pa-dot--yellow {
  background: var(--state-yellow);
}

.page-about .pa-dot--red {
  background: var(--state-red);
}

/* ---------- 合作生态 ---------- */
.page-about .pa-eco {
  display: grid;
  gap: 12px;
  margin-top: 24px;
}

.page-about .pa-eco__card {
  padding: 18px;
  border: 1px solid var(--pa-hair);
  border-radius: var(--radius-md);
  background: var(--paper-warm);
  transition: transform 180ms var(--ease), border-color 180ms var(--ease), box-shadow 180ms var(--ease);
}

.page-about .pa-eco__card:hover,
.page-about .pa-eco__card:focus-within,
.page-about .pa-eco__card:focus {
  transform: translateY(-3px);
  border-color: var(--green-mid);
  box-shadow: 0 12px 26px rgba(36, 26, 20, 0.12);
  outline: none;
}

.page-about .pa-eco__num {
  margin: 0 !important;
  font-family: var(--font-mono);
  font-size: 30px;
  font-weight: 600;
  line-height: 1;
  color: var(--green-mid);
  font-variant-numeric: tabular-nums;
}

.page-about .pa-eco__card h3 {
  margin-top: 10px;
}

.page-about .pa-eco__desc {
  margin-top: 8px !important;
  font-size: 13px !important;
  line-height: 1.75 !important;
}

.page-about .pa-eco__dir {
  margin-top: 12px !important;
  padding-top: 10px;
  border-top: 1px dashed var(--pa-hair);
  font-family: var(--font-mono);
  font-size: 11px !important;
  letter-spacing: 0.04em;
  color: var(--orange) !important;
}

/* ---------- 工作方式 ---------- */
.page-about .pa-flow {
  display: grid;
  gap: 0;
  margin: 24px 0 0;
  padding: 0;
  list-style: none;
}

.page-about .pa-flow li {
  display: grid;
  grid-template-columns: 30px minmax(0, 1fr);
  gap: 14px;
  padding: 18px 0;
  border-top: 1px solid var(--pa-hair);
}

.page-about .pa-flow li:first-child {
  border-top: 0;
  padding-top: 0;
}

.page-about .pa-flow li:last-child {
  padding-bottom: 0;
}

.page-about .pa-flow__no {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 30px;
  height: 30px;
  border-radius: 50%;
  border: 1px solid var(--pa-hair-strong);
  font-size: 12px;
  color: var(--ink);
}

.page-about .pa-flow h3 {
  margin-bottom: 6px;
}

.page-about .pa-flow p {
  margin: 0;
  font-size: 14px;
  line-height: 1.8;
}

/* ---------- 行动区 ---------- */
.page-about .pa-cta {
  margin-top: 34px;
}

.page-about .pa-cta p {
  max-width: 52ch;
}

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

.page-about .pa-cta__links .btn {
  text-decoration: none;
  border-bottom: 0;
}

/* ---------- 断点 ---------- */
@media (min-width: 620px) {
  .page-about .pa-hero {
    padding: 34px 32px 52px;
  }

  .page-about .pa-metrics {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 16px;
  }

  .page-about .pa-dims {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    column-gap: 32px;
  }

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

  .page-about .pa-split {
    grid-template-columns: minmax(0, 1fr) minmax(0, 0.72fr);
    align-items: start;
  }

  .page-about .pa-sec--dark {
    padding: 40px 30px 44px;
  }
}

@media (min-width: 960px) {
  .page-about .pa-hero {
    padding: 42px 48px 64px;
  }

  .page-about .pa-hero__lead {
    font-size: 16px;
  }

  .page-about .pa-body {
    grid-template-columns: 190px minmax(0, 1fr);
    gap: 56px;
    padding-top: 56px;
  }

  .page-about .pa-rail {
    position: sticky;
    top: 24px;
    align-self: start;
  }

  .page-about .pa-rail__list {
    display: block;
    overflow: visible;
    padding-bottom: 0;
  }

  .page-about .pa-rail__list li {
    margin-bottom: 2px;
  }

  .page-about .pa-rail__list a {
    padding: 9px 0 9px 14px;
    border: 0;
    border-left: 2px solid var(--pa-hair);
    border-radius: 0;
    background: none;
    font-size: 13px;
  }

  .page-about .pa-rail__list a.is-current {
    border-left-color: var(--orange);
    background: none;
  }

  .page-about .pa-sec {
    padding: 52px 0;
  }

  .page-about .pa-sec p {
    font-size: 16px;
  }

  .page-about .pa-sec__lead {
    font-size: 18px;
  }

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

  .page-about .pa-sec--dark {
    padding: 52px 48px 56px;
    margin: 14px 0;
  }

  .page-about .pa-split {
    gap: 32px;
    margin-top: 30px;
  }

  .page-about .pa-note {
    padding: 22px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .pa-eco__card,
  .page-about .pa-rail__list a {
    transition: none;
  }

  .page-about .pa-eco__card:hover,
  .page-about .pa-eco__card:focus-within {
    transform: none;
  }
}
<<<PAGE_CSS_END>>>
<<<END>>>