.page-about {
  background: var(--cream);
  color: var(--text);
  overflow-x: hidden;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  background: var(--ink);
  color: var(--cream);
  padding: 104px 0 48px;
  overflow: hidden;
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  inset: 0;
  background-image: repeating-linear-gradient(
    90deg,
    rgba(255, 255, 255, 0.035) 0 2px,
    transparent 2px 96px
  );
  pointer-events: none;
}

.page-about .about-hero-glow {
  position: absolute;
  top: -180px;
  right: -120px;
  width: 520px;
  height: 520px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(46, 230, 176, 0.22) 0%, rgba(46, 230, 176, 0) 68%);
  pointer-events: none;
}

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

.page-about .about-crumb {
  margin-bottom: 32px;
  color: rgba(244, 241, 232, 0.62);
  font-size: 14px;
}

.page-about .about-crumb a {
  color: rgba(244, 241, 232, 0.88);
  text-decoration: none;
}

.page-about .about-crumb a:hover {
  color: var(--cyan);
}

.page-about .about-eyebrow {
  color: var(--flare);
  letter-spacing: 0.06em;
}

.page-about .about-hero h1 {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(30px, 6.4vw, 58px);
  line-height: 1.12;
  letter-spacing: -0.02em;
  margin: 14px 0 0;
  max-width: 15em;
  color: var(--white);
}

.page-about .about-lede {
  margin: 22px 0 0;
  font-size: 17px;
  line-height: 1.78;
  color: rgba(244, 241, 232, 0.84);
  max-width: 34em;
}

.page-about .about-hero-facts {
  list-style: none;
  margin: 34px 0 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.page-about .about-hero-facts li {
  flex: 1 1 140px;
  min-width: 128px;
  background: rgba(244, 241, 232, 0.07);
  border: 1px solid rgba(46, 230, 176, 0.28);
  border-radius: var(--radius-md);
  padding: 14px 16px;
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.page-about .about-fact-num {
  font-size: 28px;
  line-height: 1;
  color: var(--cyan);
  font-weight: 700;
}

.page-about .about-fact-label {
  font-size: 13px;
  line-height: 1.5;
  color: rgba(244, 241, 232, 0.7);
}

.page-about .about-hero-media {
  margin: 34px 0 0;
  border-radius: var(--radius-lg);
  overflow: hidden;
  border: 1px solid rgba(46, 230, 176, 0.22);
}

.page-about .about-hero-media img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
  aspect-ratio: 9 / 11;
}

@media (min-width: 920px) {
  .page-about .about-hero {
    padding: 140px 0 76px;
  }

  .page-about .about-hero-grid {
    display: grid;
    grid-template-columns: minmax(0, 1.2fr) minmax(280px, 360px);
    gap: 56px;
    align-items: end;
  }

  .page-about .about-hero-media {
    margin: 0;
  }

  .page-about .about-hero-media img {
    aspect-ratio: 9 / 11;
    max-height: 460px;
  }
}

/* ---------- 主体框架 ---------- */
.page-about .about-body {
  display: grid;
  gap: 0;
  padding: 48px 0 0;
}

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

@media (min-width: 1020px) {
  .page-about .about-body {
    grid-template-columns: 190px minmax(0, 1fr);
    gap: 56px;
    padding-top: 72px;
  }

  .page-about .about-toc {
    display: block;
    align-self: start;
    position: sticky;
    top: calc(var(--header-h-min) + 32px);
    padding-bottom: 32px;
  }
}

.page-about .about-toc-title {
  font-size: 12px;
  letter-spacing: 0.18em;
  color: var(--slate);
  margin: 0 0 14px;
  padding-bottom: 10px;
  border-bottom: 2px solid var(--clay);
}

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

.page-about .about-toc-list a {
  display: flex;
  align-items: baseline;
  gap: 9px;
  padding: 9px 10px;
  border-radius: var(--radius-sm);
  font-size: 14px;
  line-height: 1.5;
  color: var(--slate);
  text-decoration: none;
  transition: background-color 120ms ease-out, color 120ms ease-out;
}

.page-about .about-toc-num {
  font-size: 11px;
  color: var(--clay);
}

.page-about .about-toc-list a:hover {
  background: rgba(31, 122, 77, 0.1);
  color: var(--grass-deep);
}

.page-about .about-toc-list a.is-current {
  background: var(--grass);
  color: var(--white);
}

.page-about .about-toc-list a.is-current .about-toc-num {
  color: var(--flare);
}

/* ---------- 章节通用 ---------- */
.page-about .about-section {
  padding: 40px 0 52px;
  border-top: 2px solid rgba(199, 99, 58, 0.35);
}

.page-about .about-section:first-child {
  border-top: none;
  padding-top: 0;
}

.page-about .about-sec-num {
  font-size: 13px;
  letter-spacing: 0.14em;
  color: var(--clay);
  margin: 0 0 10px;
}

.page-about .about-sec-title {
  font-family: var(--font-serif);
  font-weight: 600;
  font-size: clamp(23px, 4.6vw, 34px);
  line-height: 1.3;
  letter-spacing: -0.01em;
  color: var(--grass-deep);
  margin: 0 0 20px;
  max-width: 22em;
}

.page-about .about-sec-lede {
  font-family: var(--font-serif);
  font-size: 17px;
  line-height: 1.75;
  color: var(--slate);
  margin: -6px 0 26px;
  max-width: 40em;
}

.page-about .about-prose p {
  font-size: 16.5px;
  line-height: 1.82;
  color: var(--text);
  margin: 0 0 18px;
  max-width: 42em;
}

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

/* ---------- 受众 ---------- */
.page-about .about-audience {
  list-style: none;
  margin: 30px 0 0;
  padding: 0;
  display: grid;
  gap: 14px;
}

.page-about .about-audience-item {
  background: var(--white);
  border: 1px solid var(--line);
  border-left: 4px solid var(--grass);
  border-radius: var(--radius-md);
  padding: 18px 20px;
}

.page-about .about-audience-item h3 {
  margin: 0 0 8px;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 17px;
  letter-spacing: -0.01em;
  color: var(--ink);
}

.page-about .about-audience-item p {
  margin: 0;
  font-size: 15px;
  line-height: 1.72;
  color: var(--slate);
}

@media (min-width: 760px) {
  .page-about .about-audience {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 18px;
  }
}

/* ---------- 时间轴 ---------- */
.page-about .about-section--timeline {
  position: relative;
  background: linear-gradient(180deg, rgba(110, 139, 90, 0.1) 0%, rgba(110, 139, 90, 0) 100%);
  border-radius: var(--radius-lg);
  padding: 34px 22px 48px;
  margin: 0 -6px 12px;
  border-top: 2px solid rgba(199, 99, 58, 0.35);
}

.page-about .timeline {
  list-style: none;
  margin: 32px 0 0;
  padding: 0 0 0 26px;
  position: relative;
}

.page-about .timeline::before {
  content: "";
  position: absolute;
  left: 7px;
  top: 10px;
  bottom: 14px;
  width: 2px;
  border-radius: 2px;
  background: linear-gradient(180deg, var(--clay) 0%, var(--grass) 62%, var(--cyan) 100%);
}

.page-about .timeline-item {
  position: relative;
  padding-bottom: 22px;
}

.page-about .timeline-item::before {
  content: "";
  position: absolute;
  left: -24px;
  top: 22px;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--cream);
  border: 3px solid var(--grass);
  box-sizing: content-box;
}

.page-about .timeline-item--current::before {
  background: var(--cyan);
  border-color: var(--grass-deep);
  box-shadow: 0 0 0 4px rgba(46, 230, 176, 0.28);
}

.page-about .timeline-mark {
  display: inline-block;
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--grass-deep);
  background: rgba(255, 211, 77, 0.42);
  border-radius: 999px;
  padding: 4px 12px;
  margin: 0 0 10px;
}

.page-about .timeline-card {
  background: var(--white);
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
  padding: 18px 20px;
}

.page-about .timeline-item--current .timeline-card {
  background: var(--ink);
  border-color: var(--grass);
  color: var(--cream);
}

.page-about .timeline-card h3 {
  margin: 0 0 8px;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 17px;
  line-height: 1.4;
  letter-spacing: -0.01em;
  color: var(--ink);
}

.page-about .timeline-item--current .timeline-card h3 {
  color: var(--cyan);
}

.page-about .timeline-card p {
  margin: 0;
  font-size: 15px;
  line-height: 1.74;
  color: var(--slate);
}

.page-about .timeline-item--current .timeline-card p {
  color: rgba(244, 241, 232, 0.82);
}

@media (min-width: 860px) {
  .page-about .about-section--timeline {
    padding: 40px 40px 56px;
    margin: 0 0 16px;
  }

  .page-about .timeline-item {
    display: grid;
    grid-template-columns: 130px minmax(0, 1fr);
    gap: 22px;
    align-items: start;
  }

  .page-about .timeline-mark {
    margin-top: 16px;
    text-align: center;
  }

  .page-about .timeline-item::before {
    top: 20px;
  }
}

/* ---------- 团队 ---------- */
.page-about .about-team-grid {
  display: grid;
  gap: 32px;
}

.page-about .about-team-intro {
  font-family: var(--font-serif);
  font-size: 17px;
  line-height: 1.78;
  color: var(--text);
  margin: 0 0 24px;
  max-width: 40em;
}

.page-about .about-team-figure {
  margin: 0;
  border-radius: var(--radius-md);
  overflow: hidden;
  border: 1px solid var(--line);
}

.page-about .about-team-figure img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
  aspect-ratio: 10 / 7;
}

.page-about .about-team-figure figcaption {
  background: var(--white);
  border-top: 1px solid var(--line);
  padding: 12px 16px;
  font-size: 13.5px;
  line-height: 1.6;
  color: var(--slate);
}

.page-about .about-chart-title {
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--slate);
  margin: 0 0 14px;
}

.page-about .about-donut {
  display: block;
  width: 180px;
  height: 180px;
  margin: 0 auto 18px;
}

.page-about .donut-track {
  fill: none;
  stroke: var(--line);
  stroke-width: 20;
}

.page-about .donut-seg {
  fill: none;
  stroke-width: 20;
  stroke-linecap: butt;
}

.page-about .donut-seg--a { stroke: var(--grass); }
.page-about .donut-seg--b { stroke: var(--clay); }
.page-about .donut-seg--c { stroke: var(--moss); }

.page-about .donut-center {
  font-family: var(--font-mono);
  font-size: 26px;
  font-weight: 700;
  fill: var(--ink);
}

.page-about .donut-sub {
  font-size: 10px;
  fill: var(--slate);
}

.page-about .about-legend {
  list-style: none;
  margin: 0 0 24px;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 9px;
}

.page-about .about-legend li {
  display: flex;
  align-items: center;
  gap: 9px;
  font-size: 14.5px;
  color: var(--text);
}

.page-about .legend-dot {
  width: 12px;
  height: 12px;
  border-radius: 3px;
  flex: none;
}

.page-about .legend-dot--a { background: var(--grass); }
.page-about .legend-dot--b { background: var(--clay); }
.page-about .legend-dot--c { background: var(--moss); }

.page-about .legend-num {
  font-size: 13px;
  color: var(--slate);
  min-width: 2.2em;
}

.page-about .about-check-card {
  background: var(--ink);
  color: var(--cream);
  border-radius: var(--radius-md);
  padding: 20px 22px;
}

.page-about .about-check-num {
  font-size: 34px;
  line-height: 1;
  color: var(--flare);
  margin: 0 0 10px;
  font-weight: 700;
}

.page-about .about-check-num span {
  font-size: 14px;
  color: rgba(244, 241, 232, 0.72);
  margin-left: 4px;
}

.page-about .about-check-card p:last-child {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.72;
  color: rgba(244, 241, 232, 0.8);
}

@media (min-width: 940px) {
  .page-about .about-team-grid {
    grid-template-columns: minmax(0, 1.35fr) minmax(280px, 1fr);
    gap: 44px;
    align-items: start;
  }
}

/* ---------- 数据来源 ---------- */
.page-about .about-section--moss {
  background: var(--moss);
  color: var(--white);
  border-radius: var(--radius-lg);
  padding: 34px 22px 42px;
  margin: 8px -6px 12px;
  border-top: none;
}

.page-about .about-section--moss .about-sec-num {
  color: rgba(255, 255, 255, 0.7);
}

.page-about .about-section--moss .about-sec-title {
  color: var(--white);
}

.page-about .about-section--moss .about-prose p {
  color: rgba(255, 255, 255, 0.92);
}

.page-about .about-source-figure {
  margin: 28px 0 0;
  border-radius: var(--radius-md);
  overflow: hidden;
  border: 1px solid rgba(255, 255, 255, 0.28);
}

.page-about .about-source-figure img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
  aspect-ratio: 2 / 1;
}

.page-about .about-source-steps {
  list-style: none;
  margin: 28px 0 0;
  padding: 0;
  display: grid;
  gap: 14px;
}

.page-about .about-source-steps li {
  background: rgba(244, 241, 232, 0.12);
  border: 1px solid rgba(255, 255, 255, 0.24);
  border-radius: var(--radius-md);
  padding: 16px 18px;
}

.page-about .about-source-steps h3 {
  margin: 0 0 8px;
  display: flex;
  align-items: baseline;
  gap: 10px;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 16px;
  color: var(--white);
}

.page-about .about-source-steps h3 .mono {
  font-size: 12px;
  color: var(--flare);
}

.page-about .about-source-steps p {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.72;
  color: rgba(255, 255, 255, 0.86);
}

@media (min-width: 760px) {
  .page-about .about-section--moss {
    padding: 40px 40px 48px;
    margin: 8px 0 16px;
  }

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

@media (min-width: 1060px) {
  .page-about .about-source-steps {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

/* ---------- 版本沿革 ---------- */
.page-about .about-versions {
  margin: 26px 0 0;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.page-about .version-item {
  background: var(--white);
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
  overflow: hidden;
}

.page-about .version-item[open] {
  border-color: var(--grass);
  box-shadow: 0 0 0 1px rgba(31, 122, 77, 0.24);
}

.page-about .version-item summary {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 15px 18px;
  cursor: pointer;
  list-style: none;
}

.page-about .version-item summary::-webkit-details-marker {
  display: none;
}

.page-about .version-item summary::marker {
  content: "";
}

.page-about .version-tag {
  font-size: 13px;
  font-weight: 700;
  color: var(--grass-deep);
  background: rgba(46, 230, 176, 0.24);
  border-radius: 999px;
  padding: 3px 11px;
  flex: none;
}

.page-about .version-item[open] .version-tag {
  background: var(--grass);
  color: var(--white);
}

.page-about .version-title {
  flex: 1 1 auto;
  font-size: 15.5px;
  line-height: 1.5;
  color: var(--ink);
}

.page-about .version-toggle {
  flex: none;
  width: 10px;
  height: 10px;
  border-right: 2px solid var(--slate);
  border-bottom: 2px solid var(--slate);
  transform: rotate(45deg);
  transition: transform 200ms ease-out;
  margin-right: 4px;
}

.page-about .version-item[open] .version-toggle {
  transform: rotate(-135deg);
  border-color: var(--grass);
}

.page-about .version-body {
  padding: 0 18px 18px;
  border-top: 1px dashed var(--line);
  margin-top: 2px;
  padding-top: 14px;
}

.page-about .version-body p {
  margin: 0 0 10px;
  font-size: 15px;
  line-height: 1.76;
  color: var(--slate);
  max-width: 42em;
}

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

.page-about .version-links {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 8px;
}

.page-about .version-links a {
  color: var(--grass);
  font-weight: 600;
  text-decoration: none;
  border-bottom: 1px solid rgba(31, 122, 77, 0.4);
}

.page-about .version-links a:hover {
  color: var(--grass-deep);
  border-bottom-color: var(--grass-deep);
}

.page-about .about-versions-note {
  margin: 18px 0 0;
  font-size: 14.5px;
  line-height: 1.7;
  color: var(--slate);
}

.page-about .about-versions-note a {
  color: var(--grass);
  font-weight: 600;
}

/* ---------- 资质与合作 ---------- */
.page-about .about-cred-grid {
  display: grid;
  gap: 14px;
}

.page-about .about-cred-card {
  background: var(--white);
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
  padding: 20px 22px;
}

.page-about .about-cred-card h3 {
  margin: 0 0 9px;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 17px;
  letter-spacing: -0.01em;
  color: var(--ink);
}

.page-about .about-cred-card p {
  margin: 0;
  font-size: 15px;
  line-height: 1.74;
  color: var(--slate);
}

.page-about .about-cred-card--grass {
  background: var(--grass);
  border-color: var(--grass-deep);
}

.page-about .about-cred-card--grass h3,
.page-about .about-cred-card--grass p {
  color: var(--white);
}

.page-about .about-cred-card--grass p {
  color: rgba(255, 255, 255, 0.9);
}

.page-about .about-cred-card--clay {
  background: var(--clay);
  border-color: #a94f2c;
}

.page-about .about-cred-card--clay h3,
.page-about .about-cred-card--clay p {
  color: var(--white);
}

.page-about .about-cred-card--clay p {
  color: rgba(255, 255, 255, 0.92);
}

@media (min-width: 760px) {
  .page-about .about-cred-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 16px;
  }

  .page-about .about-cred-card--wide {
    grid-column: 1 / -1;
  }
}

@media (min-width: 1080px) {
  .page-about .about-cred-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .page-about .about-cred-card--wide {
    grid-column: span 2;
  }
}

/* ---------- 收尾 CTA ---------- */
.page-about .about-cta {
  background: var(--ink);
  color: var(--cream);
  border-radius: var(--radius-lg) var(--radius-lg) 0 0;
  margin-top: 40px;
  padding: 44px 0 52px;
}

.page-about .about-cta-inner {
  display: grid;
  gap: 26px;
}

.page-about .about-cta-eyebrow {
  color: var(--cyan);
  letter-spacing: 0.08em;
}

.page-about .about-cta h2 {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(23px, 4.6vw, 34px);
  line-height: 1.24;
  letter-spacing: -0.02em;
  color: var(--white);
  margin: 12px 0 14px;
  max-width: 18em;
}

.page-about .about-cta-copy p:last-child {
  margin: 0;
  font-size: 16px;
  line-height: 1.78;
  color: rgba(244, 241, 232, 0.8);
  max-width: 40em;
}

.page-about .about-cta-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

@media (min-width: 900px) {
  .page-about .about-cta {
    padding: 56px 0 64px;
    margin-top: 56px;
  }

  .page-about .about-cta-inner {
    grid-template-columns: minmax(0, 1.5fr) minmax(240px, 1fr);
    align-items: center;
    gap: 48px;
  }

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

/* ---------- 减弱动效 ---------- */
@media (prefers-reduced-motion: reduce) {
  .page-about .about-toc-list a,
  .page-about .version-toggle {
    transition: none;
  }
}
</PAGE_CSS>