.page-about {
  --about-index-w: 234px;
  --about-gutter: clamp(24px, 3vw, 48px);
  background: var(--mist);
  color: var(--graphite);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  overflow: hidden;
  padding: clamp(20px, 3.4vw, 36px) 0 clamp(44px, 6vw, 84px);
  background:
    radial-gradient(120% 90% at 10% 0%, rgba(47, 123, 255, 0.24), transparent 58%),
    radial-gradient(86% 74% at 94% 14%, rgba(255, 107, 26, 0.16), transparent 62%),
    var(--navy-900);
  color: var(--mist);
  border-bottom: 1px solid var(--line-dark);
}

.page-about .about-hero__grid-bg {
  position: absolute;
  inset: 0;
  pointer-events: none;
  background-image:
    linear-gradient(to right, rgba(188, 208, 230, 0.08) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(188, 208, 230, 0.08) 1px, transparent 1px);
  background-size: 72px 72px;
  -webkit-mask-image: linear-gradient(to bottom, rgba(0, 0, 0, 0.9), transparent 88%);
  mask-image: linear-gradient(to bottom, rgba(0, 0, 0, 0.9), transparent 88%);
}

.page-about .about-hero .breadcrumb__link {
  color: rgba(243, 247, 252, 0.72);
}

.page-about .about-hero .breadcrumb__link:hover {
  color: var(--white);
}

.page-about .about-hero .breadcrumb__sep,
.page-about .about-hero .breadcrumb__current {
  color: rgba(243, 247, 252, 0.52);
}

.page-about .about-hero__inner {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(26px, 3.4vw, 44px);
  margin-top: clamp(26px, 4vw, 46px);
}

.page-about .about-hero__lead .eyebrow {
  color: var(--sand);
  letter-spacing: 0.16em;
}

.page-about .about-hero h1 {
  margin: 14px 0 0;
  max-width: 15em;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(32px, 5.4vw, 60px);
  line-height: 1.04;
  letter-spacing: -0.03em;
  color: var(--white);
}

.page-about .about-hero .lede {
  margin-top: 18px;
  max-width: 46ch;
  font-size: clamp(15px, 1.1vw, 17px);
  line-height: 1.8;
  color: rgba(243, 247, 252, 0.76);
}

.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 26px;
}

.page-about .about-hero__plate {
  align-self: end;
  padding: 20px 20px 14px;
  border: 1px solid var(--line-dark);
  border-radius: var(--radius-md);
  background: rgba(255, 255, 255, 0.05);
  -webkit-backdrop-filter: blur(10px);
  backdrop-filter: blur(10px);
  box-shadow: var(--shadow-panel);
}

.page-about .about-hero__plate-title {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--teal);
}

.page-about .about-hero__stats {
  margin: 10px 0 0;
  padding: 0;
  list-style: none;
}

.page-about .about-hero__stat {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 14px;
  padding: 11px 0;
  border-bottom: 1px dashed rgba(188, 208, 230, 0.2);
}

.page-about .about-hero__stat:last-child {
  border-bottom: 0;
}

.page-about .about-hero__stat-label {
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.08em;
  color: rgba(243, 247, 252, 0.66);
}

.page-about .about-hero__stat-value {
  font-family: var(--font-mono);
  font-size: 21px;
  line-height: 1.1;
  font-variant-numeric: tabular-nums;
  color: var(--white);
}

.page-about .about-hero__stat-value--warm {
  color: var(--orange-bright);
}

.page-about .about-hero__unit {
  margin-left: 3px;
  font-size: 12px;
  font-weight: 500;
  color: rgba(243, 247, 252, 0.6);
}

/* ---------- 主体两栏 ---------- */
.page-about .about-body {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: var(--about-gutter);
  padding-top: clamp(34px, 4.6vw, 60px);
  padding-bottom: clamp(48px, 7vw, 96px);
}

/* ---------- 章节索引 ---------- */
.page-about .about-index {
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
  background: var(--white);
  padding: 14px 14px 12px;
  box-shadow: var(--shadow-panel);
}

.page-about .about-index__title {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.16em;
  color: var(--blue);
}

.page-about .about-index__list {
  display: flex;
  gap: 6px;
  margin: 10px 0 0;
  padding: 0 0 4px;
  list-style: none;
  overflow-x: auto;
  scrollbar-width: thin;
}

.page-about .about-index__link {
  display: flex;
  align-items: baseline;
  gap: 8px;
  padding: 8px 10px;
  border-left: 2px solid transparent;
  border-radius: var(--radius-sm);
  font-size: 13px;
  font-weight: 600;
  line-height: 1.4;
  white-space: nowrap;
  color: var(--graphite);
  text-decoration: none;
  transition: color 0.18s var(--ease-out), background-color 0.18s var(--ease-out), border-color 0.18s var(--ease-out);
}

.page-about .about-index__link:hover,
.page-about .about-index__link:focus-visible {
  color: var(--blue);
  background: var(--blue-soft);
  border-left-color: var(--blue);
}

.page-about .about-index__num {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--ink-muted);
}

.page-about .about-index__note {
  margin: 12px 0 0;
  padding-top: 10px;
  border-top: 1px dashed var(--line-soft);
  font-family: var(--font-mono);
  font-size: 11px;
  line-height: 1.6;
  color: var(--ink-muted);
}

/* ---------- 章节通用 ---------- */
.page-about .about-sec {
  padding-block: clamp(30px, 4vw, 52px);
  border-top: 1px solid var(--line-soft);
}

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

.page-about .about-sec__head {
  display: flex;
  align-items: flex-start;
  gap: 14px;
}

.page-about .about-sec__num {
  flex: 0 0 auto;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 46px;
  height: 34px;
  padding: 0 10px;
  border-radius: var(--radius-sm);
  background: var(--navy-900);
  color: var(--sand);
  font-family: var(--font-serif);
  font-size: 17px;
  font-weight: 600;
  letter-spacing: 0.04em;
}

.page-about .about-sec h2 {
  margin: 3px 0 0;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(22px, 3vw, 34px);
  line-height: 1.2;
  letter-spacing: -0.02em;
  color: var(--navy-900);
}

.page-about .about-sec p {
  margin: 14px 0 0;
  max-width: 62ch;
  font-size: 15.5px;
  line-height: 1.8;
  color: var(--ink-muted);
}

.page-about .about-sec h3 {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 16px;
  line-height: 1.4;
  color: var(--navy-900);
}

.page-about .about-inline-note {
  padding-left: 14px;
  border-left: 2px solid var(--sand);
  font-size: 14px;
  color: var(--graphite) !important;
}

.page-about .about-link {
  color: var(--blue);
  font-weight: 600;
  text-decoration: none;
  border-bottom: 1px solid rgba(47, 123, 255, 0.36);
  transition: color 0.16s var(--ease-out), border-color 0.16s var(--ease-out);
}

.page-about .about-link:hover,
.page-about .about-link:focus-visible {
  color: var(--navy-900);
  border-bottom-color: var(--navy-900);
}

/* ---------- 图文分栏 ---------- */
.page-about .about-split {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(20px, 2.6vw, 32px);
  margin-top: 18px;
}

.page-about .about-split__text p:first-child {
  margin-top: 0;
}

.page-about .about-figure {
  margin: 24px 0 0;
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
  overflow: hidden;
  background: var(--navy-800);
}

.page-about .about-split .about-figure {
  margin-top: 0;
}

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

.page-about .about-figure figcaption {
  padding: 10px 14px;
  border-top: 1px solid var(--line);
  background: var(--white);
  font-size: 12.5px;
  line-height: 1.6;
  color: var(--ink-muted);
}

/* ---------- 阶段时间轴 ---------- */
.page-about .about-flow {
  display: block;
  width: 100%;
  max-width: 720px;
  height: auto;
  margin: 20px 0 4px;
}

.page-about .about-stage {
  margin-top: 12px;
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
  background: var(--white);
  overflow: hidden;
}

.page-about .about-stage > summary {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 15px 18px;
  cursor: pointer;
  list-style: none;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 15.5px;
  line-height: 1.45;
  color: var(--navy-900);
  transition: background-color 0.18s var(--ease-out);
}

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

.page-about .about-stage > summary:hover {
  background: var(--blue-soft);
}

.page-about .about-stage > summary::after {
  content: "+";
  margin-left: auto;
  font-family: var(--font-mono);
  font-size: 18px;
  color: var(--blue);
}

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

.page-about .about-stage[open] > summary {
  border-bottom: 1px dashed var(--line-soft);
}

.page-about .about-stage__chip {
  flex: 0 0 auto;
  padding: 3px 8px;
  border-radius: var(--radius-sm);
  background: var(--navy-900);
  color: var(--sand);
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 500;
  letter-spacing: 0.06em;
}

.page-about .about-stage__body {
  padding: 14px 18px 18px;
}

.page-about .about-stage__body p {
  margin-top: 0;
  font-size: 15px;
}

/* ---------- 发布流程步骤 ---------- */
.page-about .about-flow-steps {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 12px;
  margin: 22px 0 0;
  padding: 0;
  list-style: none;
}

.page-about .about-flow-step {
  padding: 16px 18px;
  border: 1px solid var(--line);
  border-left: 3px solid var(--blue);
  border-radius: var(--radius-sm);
  background: var(--white);
}

.page-about .about-flow-step:nth-child(even) {
  border-left-color: var(--orange);
}

.page-about .about-flow-step__num {
  display: block;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.12em;
  color: var(--ink-muted);
}

.page-about .about-flow-step h3 {
  margin-top: 6px;
}

.page-about .about-flow-step p {
  margin-top: 8px;
  font-size: 14.5px;
  line-height: 1.75;
}

/* ---------- 团队（深色） ---------- */
.page-about .about-sec--dark {
  position: relative;
  margin-block: clamp(8px, 1.4vw, 18px);
  padding: clamp(24px, 3.4vw, 42px);
  border: 1px solid var(--line-dark);
  border-radius: var(--radius-md);
  background:
    radial-gradient(90% 80% at 92% 0%, rgba(47, 123, 255, 0.28), transparent 62%),
    var(--navy-900);
  color: var(--mist);
  overflow: hidden;
}

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

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

.page-about .about-sec--dark .about-sec__num {
  background: rgba(255, 255, 255, 0.08);
  border: 1px solid var(--line-dark);
  color: var(--sand);
}

.page-about .about-sec--dark p {
  color: rgba(243, 247, 252, 0.74);
}

.page-about .about-sec__lede {
  font-size: 15.5px;
}

.page-about .about-team-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 12px;
  margin-top: 22px;
}

.page-about .about-team-card {
  padding: 16px 18px;
  border: 1px solid var(--line-dark);
  border-radius: var(--radius-sm);
  background: rgba(255, 255, 255, 0.05);
}

.page-about .about-team-card__count {
  display: block;
  font-family: var(--font-mono);
  font-size: 28px;
  line-height: 1;
  font-variant-numeric: tabular-nums;
  color: var(--teal);
}

.page-about .about-team-card h3 {
  margin-top: 10px;
}

.page-about .about-team-card p {
  margin-top: 8px;
  font-size: 14px;
  line-height: 1.72;
}

.page-about .about-figure--dark {
  border-color: var(--line-dark);
  background: var(--navy-800);
}

.page-about .about-figure--dark figcaption {
  background: rgba(255, 255, 255, 0.05);
  border-top-color: var(--line-dark);
  color: rgba(243, 247, 252, 0.66);
}

/* ---------- 覆盖与场景 ---------- */
.page-about .about-coverage-stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 10px;
  margin: 22px 0 0;
  padding: 0;
  list-style: none;
}

.page-about .about-coverage-stat {
  padding: 14px 16px;
  border: 1px solid var(--line);
  border-radius: var(--radius-sm);
  background: var(--white);
}

.page-about .about-coverage-stat__value {
  display: block;
  font-family: var(--font-mono);
  font-size: 26px;
  line-height: 1.05;
  font-variant-numeric: tabular-nums;
  color: var(--navy-900);
}

.page-about .about-coverage-stat__unit {
  margin-left: 2px;
  font-size: 13px;
  color: var(--ink-muted);
}

.page-about .about-coverage-stat__label {
  display: block;
  margin-top: 6px;
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.05em;
  color: var(--ink-muted);
}

.page-about .about-scene-list {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 14px;
  margin-top: 22px;
}

.page-about .about-scene {
  position: relative;
  padding: 16px 18px 16px 20px;
  border-top: 2px solid var(--teal);
  background: var(--white);
  border-radius: var(--radius-sm);
  box-shadow: var(--shadow-panel);
}

.page-about .about-scene__idx {
  display: block;
  font-family: var(--font-serif);
  font-size: 15px;
  font-weight: 600;
  color: var(--sand);
}

.page-about .about-scene h3 {
  margin-top: 4px;
}

.page-about .about-scene p {
  margin-top: 8px;
  font-size: 14.5px;
  line-height: 1.75;
}

/* ---------- 合作生态 ---------- */
.page-about .about-partner-list {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 12px;
  margin: 22px 0 0;
  padding: 0;
  list-style: none;
}

.page-about .about-partner {
  padding: 16px 18px;
  border: 1px solid var(--line);
  border-left: 3px solid var(--sand);
  border-radius: var(--radius-sm);
  background: var(--white);
}

.page-about .about-partner p {
  margin-top: 8px;
  font-size: 14.5px;
  line-height: 1.75;
}

.page-about .about-cta {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 16px;
  margin-top: 24px;
  padding: clamp(18px, 2.4vw, 26px);
  border-radius: var(--radius-md);
  background:
    linear-gradient(120deg, rgba(47, 123, 255, 0.14), rgba(255, 107, 26, 0.12)),
    var(--white);
  border: 1px solid var(--line);
}

.page-about .about-cta__text h3 {
  font-size: 18px;
}

.page-about .about-cta__text p {
  margin-top: 8px;
  font-size: 14.5px;
}

.page-about .about-cta__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  align-items: center;
}

.page-about .about-contact {
  margin: 20px 0 0;
  padding: 0;
  list-style: none;
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
  background: var(--white);
  overflow: hidden;
}

.page-about .about-contact .contact-row {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px 14px;
  padding: 13px 16px;
  border-bottom: 1px dashed var(--line-soft);
}

.page-about .about-contact .contact-row:last-child {
  border-bottom: 0;
}

.page-about .about-contact .contact-row__label {
  flex: 0 0 auto;
  min-width: 68px;
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.06em;
  color: var(--ink-muted);
}

.page-about .about-contact .contact-row__value {
  flex: 1 1 auto;
  min-width: 0;
  font-family: var(--font-mono);
  font-size: 14px;
  word-break: break-word;
  color: var(--navy-900);
}

.page-about .about-contact .copy-btn {
  flex: 0 0 auto;
  padding: 5px 12px;
  border: 1px solid var(--line);
  border-radius: var(--radius-sm);
  background: var(--mist);
  font-size: 12px;
  font-weight: 600;
  color: var(--blue);
  cursor: pointer;
  transition: background-color 0.16s var(--ease-out), border-color 0.16s var(--ease-out);
}

.page-about .about-contact .copy-btn:hover,
.page-about .about-contact .copy-btn:focus-visible {
  background: var(--blue-soft);
  border-color: var(--blue);
}

/* ---------- 响应式 ---------- */
@media (min-width: 640px) {
  .page-about .about-team-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

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

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

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

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

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

@media (min-width: 900px) {
  .page-about .about-hero__inner {
    grid-template-columns: minmax(0, 1.45fr) minmax(0, 0.88fr);
    align-items: end;
  }

  .page-about .about-split {
    grid-template-columns: minmax(0, 1fr) minmax(0, 0.86fr);
    align-items: start;
  }

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

@media (min-width: 1024px) {
  .page-about .about-body {
    grid-template-columns: var(--about-index-w) minmax(0, 1fr);
    align-items: start;
  }

  .page-about .about-index {
    position: sticky;
    top: 108px;
    align-self: start;
  }

  .page-about .about-index__list {
    flex-direction: column;
    gap: 2px;
    overflow: visible;
    padding-bottom: 0;
  }

  .page-about .about-index__link {
    white-space: normal;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-index__link,
  .page-about .about-stage > summary,
  .page-about .about-link,
  .page-about .about-contact .copy-btn {
    transition: none;
  }
}
<<<END>>>