.page-about {
  --about-gap: clamp(52px, 8vw, 108px);
  --about-paper-line: rgba(26, 18, 13, 0.16);
  padding: clamp(20px, 4vw, 44px) var(--gutter) clamp(64px, 9vw, 128px);
  color: var(--text);
}

.page-about .about-shell {
  max-width: var(--shell);
  margin-inline: auto;
}

.page-about .breadcrumbs {
  font-size: 13px;
  letter-spacing: 0.08em;
  color: var(--text-dim);
  margin-bottom: clamp(18px, 3vw, 30px);
}

.page-about .breadcrumbs a {
  color: var(--mist);
  text-decoration: none;
}

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

/* ---------- 首屏 ---------- */
.page-about .about-cover {
  display: grid;
  grid-template-columns: 1fr;
  gap: 0;
  border: 1px solid var(--line-strong);
  border-radius: var(--radius-lg);
  overflow: hidden;
  background:
    radial-gradient(120% 140% at 8% 0%, rgba(53, 230, 224, 0.14), transparent 58%),
    linear-gradient(160deg, var(--ink-850), var(--ink-900) 62%);
  box-shadow: var(--shadow-lift);
}

.page-about .about-cover__frame {
  position: relative;
  padding: clamp(26px, 5vw, 56px);
  display: flex;
  flex-direction: column;
  gap: 18px;
}

.page-about .about-cover__frame::after {
  content: "";
  position: absolute;
  inset-inline-start: clamp(26px, 5vw, 56px);
  top: 0;
  width: 64px;
  height: 2px;
  background: var(--cyan);
  box-shadow: var(--glow-cyan);
}

.page-about .about-cover .eyebrow {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--mist);
}

.page-about .about-cover h1 {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(2rem, 6vw, 3.9rem);
  line-height: 1.12;
  letter-spacing: -0.01em;
  color: #fff;
  max-width: 16ch;
}

.page-about .about-cover .lede {
  margin: 0;
  max-width: 46ch;
  font-size: clamp(15px, 1.6vw, 17px);
  line-height: 1.8;
  color: var(--text-dim);
}

.page-about .about-cover__facts {
  list-style: none;
  margin: 4px 0 0;
  padding: 0;
  display: grid;
  gap: 12px;
}

.page-about .about-cover__facts li {
  display: flex;
  align-items: baseline;
  gap: 10px;
  font-size: 14px;
  color: var(--text-dim);
  padding-bottom: 10px;
  border-bottom: 1px dashed var(--line);
}

.page-about .about-cover__num {
  font-family: var(--font-mono);
  font-size: 26px;
  font-weight: 700;
  line-height: 1;
  color: var(--amber);
  min-width: 3ch;
}

.page-about .about-cover__foot {
  margin-top: auto;
  padding-top: 20px;
  display: flex;
  align-items: center;
  gap: 12px;
  flex-wrap: wrap;
}

.page-about .about-cover__ver {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--ink-900);
  background: var(--amber);
  border-radius: 999px;
  padding: 4px 10px;
  font-weight: 700;
}

.page-about .about-cover__date {
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--text-dim);
  letter-spacing: 0.06em;
}

.page-about .about-cover__scale {
  flex: 1 1 60px;
  height: 12px;
  min-width: 60px;
  background-image: repeating-linear-gradient(to right, var(--line-strong) 0 1px, transparent 1px 12px);
  align-self: center;
}

.page-about .about-cover__figure {
  margin: 0;
  position: relative;
  min-height: 220px;
  border-top: 1px solid var(--line);
}

.page-about .about-cover__figure img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
  filter: saturate(1.05);
}

/* ---------- 章节通用 ---------- */
.page-about .about-chapter {
  margin-top: var(--about-gap);
}

.page-about .about-chapter__head {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 8px 16px;
  align-items: start;
  margin-bottom: clamp(24px, 4vw, 42px);
  padding-bottom: 20px;
  border-bottom: 1px solid var(--line);
}

.page-about .about-chapter__num {
  grid-row: 1 / span 2;
  font-family: var(--font-mono);
  font-size: clamp(28px, 5vw, 46px);
  font-weight: 700;
  line-height: 1;
  color: transparent;
  -webkit-text-stroke: 1px var(--line-strong);
}

.page-about .about-chapter__head h2 {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(1.4rem, 3.4vw, 2.2rem);
  line-height: 1.25;
  color: #fff;
}

.page-about .about-chapter__lede {
  margin: 0;
  grid-column: 2;
  max-width: 62ch;
  font-size: 15px;
  line-height: 1.85;
  color: var(--text-dim);
}

/* ---------- 场景 ---------- */
.page-about .about-scenes {
  display: grid;
  gap: 16px;
}

.page-about .about-scene {
  padding: 22px 22px 24px;
  border: 1px solid var(--line);
  border-left: 2px solid var(--ember);
  border-radius: var(--radius-sm);
  background: rgba(14, 44, 85, 0.34);
}

.page-about .about-scene h3 {
  margin: 0 0 10px;
  font-size: 16px;
  font-weight: 700;
  color: var(--mist);
  line-height: 1.5;
}

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

/* ---------- 模块错层卡片 ---------- */
.page-about .about-modules {
  display: grid;
  grid-template-columns: 1fr;
  gap: 14px;
}

.page-about .about-module {
  position: relative;
  padding: 24px 22px 22px;
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
  background: linear-gradient(175deg, rgba(14, 44, 85, 0.72), rgba(7, 21, 46, 0.9));
  transition: border-color 0.3s var(--ease), transform 0.3s var(--ease), box-shadow 0.3s var(--ease);
  outline-offset: 3px;
}

.page-about .about-module:hover,
.page-about .about-module:focus-within,
.page-about .about-module:focus-visible {
  border-color: var(--line-strong);
  transform: translateY(-3px);
  box-shadow: var(--shadow-lift);
}

.page-about .about-module::before {
  content: "";
  position: absolute;
  left: 22px;
  top: 0;
  width: 36px;
  height: 2px;
  background: var(--cyan);
  opacity: 0.85;
}

.page-about .about-module--nav::before { background: var(--amber); width: 74px; }
.page-about .about-module--help::before { background: var(--ember); }

.page-about .about-module__kicker {
  margin: 6px 0 8px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.16em;
  color: var(--haze);
  text-transform: uppercase;
}

.page-about .about-module__title {
  margin: 0 0 10px;
  font-family: var(--font-display);
  font-size: 19px;
  font-weight: 700;
  color: #fff;
}

.page-about .about-module--nav .about-module__title {
  font-size: clamp(22px, 3vw, 28px);
}

.page-about .about-module__text {
  margin: 0;
  font-size: 14px;
  line-height: 1.8;
  color: var(--text-dim);
}

.page-about .about-module__tags {
  list-style: none;
  margin: 0;
  padding: 0;
  max-height: 0;
  overflow: hidden;
  opacity: 0;
  transition: max-height 0.4s var(--ease), opacity 0.3s var(--ease), margin-top 0.3s var(--ease);
}

.page-about .about-module__tags li {
  font-size: 12px;
  line-height: 1.7;
  color: var(--mist);
  padding-left: 14px;
  position: relative;
}

.page-about .about-module__tags li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 8px;
  width: 5px;
  height: 5px;
  border-radius: 50%;
  background: var(--cyan);
}

.page-about .about-inline-link {
  margin: 26px 0 0;
  font-size: 14px;
  line-height: 1.9;
  color: var(--text-dim);
}

.page-about .about-inline-link a {
  color: var(--mist);
  text-decoration: underline;
  text-underline-offset: 3px;
  text-decoration-color: var(--line-strong);
}

.page-about .about-inline-link a:hover,
.page-about .about-inline-link a:focus-visible {
  color: var(--amber);
}

/* ---------- 版本时间线 ---------- */
.page-about .about-timeline {
  margin: 0 0 30px;
  padding: 18px 4px 8px;
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
  background: radial-gradient(90% 120% at 50% 0%, rgba(53, 230, 224, 0.09), transparent 70%);
}

.page-about .about-timeline__svg {
  display: block;
  width: 100%;
  height: auto;
  font-family: var(--font-mono);
}

.page-about .about-timeline__link {
  cursor: pointer;
}

.page-about .about-timeline__link circle {
  transition: opacity 0.3s var(--ease), r 0.3s var(--ease);
}

.page-about .about-timeline__link:hover circle,
.page-about .about-timeline__link:focus-visible circle {
  opacity: 0.32;
}

.page-about .about-timeline__cap {
  margin: 10px 0 0;
  padding-inline: 16px;
  font-size: 12px;
  letter-spacing: 0.05em;
  color: var(--haze);
}

.page-about .about-phases {
  display: grid;
  grid-template-columns: 1fr;
  gap: 14px;
}

.page-about .about-phase {
  padding: 20px 20px 22px;
  border: 1px solid var(--line);
  border-radius: var(--radius-sm);
  background: rgba(10, 29, 60, 0.6);
  scroll-margin-top: 90px;
}

.page-about .about-phase--current {
  border-color: rgba(242, 184, 75, 0.42);
  background: linear-gradient(170deg, rgba(242, 184, 75, 0.12), rgba(7, 21, 46, 0.92));
}

.page-about .about-phase__stamp {
  margin: 0 0 8px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.12em;
  color: var(--amber);
}

.page-about .about-phase__title {
  margin: 0 0 10px;
  font-family: var(--font-display);
  font-size: 17px;
  font-weight: 700;
  color: #fff;
}

.page-about .about-phase p:last-child {
  margin: 0;
  font-size: 14px;
  line-height: 1.85;
  color: var(--text-dim);
}

.page-about .about-media {
  margin: 26px 0 0;
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
  overflow: hidden;
  background: var(--ink-850);
}

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

.page-about .about-media .media-frame__caption {
  padding: 12px 18px;
  font-size: 12px;
  color: var(--haze);
  border-top: 1px solid var(--line);
}

/* ---------- 团队 ---------- */
.page-about .about-team {
  display: grid;
  grid-template-columns: 1fr;
  gap: 20px;
}

.page-about .about-team__metrics {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
}

.page-about .about-metric {
  padding: 18px 16px;
  border: 1px solid var(--line);
  border-radius: var(--radius-sm);
  background: rgba(14, 44, 85, 0.4);
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.page-about .about-metric__num {
  font-family: var(--font-mono);
  font-size: clamp(26px, 4.4vw, 38px);
  font-weight: 700;
  line-height: 1;
  color: var(--amber);
}

.page-about .about-metric__label {
  font-size: 12.5px;
  line-height: 1.6;
  color: var(--text-dim);
}

.page-about .about-team__note {
  grid-column: 1 / -1;
  margin: 4px 0 0;
  font-size: 13.5px;
  line-height: 1.85;
  color: var(--haze);
}

.page-about .about-team__figure {
  margin: 0;
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
  overflow: hidden;
  background: var(--ink-850);
}

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

.page-about .about-coop-ways {
  margin-top: 22px;
  padding: 22px;
  border-left: 2px solid var(--cyan);
  background: rgba(53, 230, 224, 0.05);
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
}

.page-about .about-coop-ways__title {
  margin: 0 0 12px;
  font-size: 15px;
  font-weight: 700;
  color: var(--mist);
}

.page-about .about-coop-ways__list {
  margin: 0;
  padding-left: 18px;
  display: grid;
  gap: 10px;
}

.page-about .about-coop-ways__list li {
  font-size: 14px;
  line-height: 1.8;
  color: var(--text-dim);
}

.page-about .about-coop-ways__list strong {
  color: #fff;
  font-weight: 700;
}

/* ---------- 服务范围 ---------- */
.page-about .about-reach {
  display: grid;
  grid-template-columns: 1fr;
  gap: 18px;
}

.page-about .about-reach__panel {
  padding: 24px 22px;
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
  background: rgba(14, 44, 85, 0.34);
}

.page-about .about-reach__panel h3 {
  margin: 0 0 16px;
  font-family: var(--font-display);
  font-size: 17px;
  color: #fff;
}

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

.page-about .about-reach__list li {
  display: grid;
  grid-template-columns: 12px 1fr;
  gap: 10px;
  font-size: 14px;
  line-height: 1.8;
  color: var(--text-dim);
}

.page-about .about-reach__list strong {
  color: var(--mist);
  font-weight: 700;
}

.page-about .about-reach__list a {
  color: var(--mist);
  text-decoration: underline;
  text-underline-offset: 3px;
}

.page-about .about-reach__mark {
  width: 8px;
  height: 8px;
  margin-top: 9px;
  border-radius: 50%;
  border: 1px solid var(--cyan);
  box-shadow: 0 0 10px -2px rgba(53, 230, 224, 0.7);
}

.page-about .about-reach__aside {
  padding: 24px 22px;
  border-radius: var(--radius-md);
  background: var(--paper);
  color: var(--brown);
  border: 1px solid rgba(26, 18, 13, 0.2);
  box-shadow: var(--shadow-lift);
}

.page-about .about-reach__badge {
  margin: 0 0 6px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.16em;
  color: #8a2f1e;
}

.page-about .about-reach__award {
  margin: 0;
  font-family: var(--font-display);
  font-size: clamp(17px, 2.4vw, 21px);
  font-weight: 800;
  line-height: 1.4;
  color: var(--brown);
}

.page-about .about-reach__aside .rule {
  margin: 18px 0;
  border: 0;
  border-top: 1px solid var(--about-paper-line);
}

.page-about .about-reach__small {
  margin: 0;
  font-size: 13.5px;
  line-height: 1.85;
  color: #4a3d33;
}

/* ---------- 合作方式 ---------- */
.page-about .about-coop {
  display: grid;
  grid-template-columns: 1fr;
  gap: 18px;
}

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

.page-about .about-coop__list {
  display: grid;
  gap: 14px;
}

.page-about .about-coop__card {
  padding: 24px 22px;
  border: 1px solid var(--line-strong);
  border-radius: var(--radius-md);
  background:
    radial-gradient(100% 120% at 100% 0%, rgba(242, 184, 75, 0.12), transparent 62%),
    linear-gradient(170deg, rgba(14, 44, 85, 0.82), rgba(7, 21, 46, 0.94));
}

.page-about .about-coop__kicker {
  margin: 0 0 8px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.16em;
  color: var(--haze);
}

.page-about .about-coop__card h3 {
  margin: 0 0 12px;
  font-family: var(--font-display);
  font-size: clamp(18px, 2.6vw, 22px);
  font-weight: 800;
  color: #fff;
}

.page-about .about-coop__card p {
  margin: 0 0 12px;
  font-size: 14px;
  line-height: 1.85;
  color: var(--text-dim);
}

.page-about .about-coop__fit {
  margin: 0;
  padding-top: 12px;
  border-top: 1px dashed var(--line);
  color: var(--mist) !important;
  font-size: 13.5px !important;
}

.page-about .about-cta {
  margin-top: 26px;
  padding: 24px;
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
  background: rgba(7, 21, 46, 0.6);
  display: flex;
  flex-direction: column;
  gap: 16px;
  align-items: flex-start;
}

.page-about .about-cta__text {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.85;
  color: var(--text-dim);
  max-width: 54ch;
}

.page-about .about-cta .btn {
  text-decoration: none;
}

/* ---------- 响应式 ---------- */
@media (min-width: 600px) {
  .page-about .about-scenes {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
  .page-about .about-scenes .about-scene:first-child {
    grid-column: 1 / -1;
  }
  .page-about .about-phases {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
  .page-about .about-team__metrics {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
  .page-about .about-coop__filters {
    flex-direction: row;
  }
}

@media (min-width: 860px) {
  .page-about .about-cover {
    grid-template-columns: 1.08fr 0.92fr;
  }
  .page-about .about-cover__figure {
    border-top: 0;
    border-left: 1px solid var(--line);
    min-height: 100%;
  }
  .page-about .about-cover__facts {
    grid-template-columns: 1fr;
    max-width: 34ch;
  }

  .page-about .about-modules {
    grid-template-columns: repeat(6, minmax(0, 1fr));
  }
  .page-about .about-module--nav { grid-column: span 4; }
  .page-about .about-module--apps { grid-column: span 2; }
  .page-about .about-module--rules { grid-column: span 2; }
  .page-about .about-module--account { grid-column: span 2; }
  .page-about .about-module--help { grid-column: span 2; }

  .page-about .about-team {
    grid-template-columns: 1.15fr 0.85fr;
    align-items: start;
  }
  .page-about .about-team__metrics {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .page-about .about-reach {
    grid-template-columns: 1.4fr 0.6fr;
    align-items: start;
  }

  .page-about .about-coop {
    grid-template-columns: 220px 1fr;
    gap: 26px;
    align-items: start;
  }
  .page-about .about-coop__filters {
    flex-direction: column;
    position: sticky;
    top: 24px;
  }
  .page-about .about-cta {
    flex-direction: row;
    align-items: center;
    justify-content: space-between;
  }
}

@media (min-width: 1024px) {
  .page-about .about-scenes {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
  .page-about .about-scenes .about-scene:first-child {
    grid-column: auto;
  }
  .page-about .about-phases {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
  .page-about .about-chapter__head {
    grid-template-columns: 96px 1fr;
  }
}

@media (hover: hover) and (min-width: 860px) {
  .page-about .about-module__tags {
    margin-top: 0;
  }
  .page-about .about-module:hover .about-module__tags,
  .page-about .about-module:focus-within .about-module__tags,
  .page-about .about-module:focus .about-module__tags {
    max-height: 90px;
    opacity: 1;
    margin-top: 14px;
  }
}

@media (hover: none) {
  .page-about .about-module__tags {
    max-height: none;
    opacity: 1;
    margin-top: 14px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-module,
  .page-about .about-module__tags,
  .page-about .about-timeline__link circle {
    transition: none;
    transform: none;
  }
}
<<<END>>>