.page-about {
  --about-card: rgba(16, 43, 78, 0.72);
  --about-glow: rgba(36, 224, 207, 0.14);
  --about-deep-text: #0B2135;
  --about-mid-text: #2C4257;
  background: var(--space);
  color: var(--mist);
  font-family: var(--font-body);
  overflow-x: clip;
}

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

.page-about .about-crumb {
  margin: 0 0 clamp(20px, 3vw, 36px);
  padding: 0;
}

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

.page-about .about-crumb a[aria-current="page"] {
  color: var(--cyan-soft);
}

.page-about .about-crumb .breadcrumb__sep {
  color: rgba(130, 152, 173, 0.6);
}

/* 首屏封面 */
.page-about .about-hero {
  position: relative;
  padding: clamp(26px, 4vw, 44px) 0 clamp(26px, 4vw, 48px);
  background:
    radial-gradient(90% 70% at 88% 2%, var(--about-glow), transparent 62%),
    radial-gradient(70% 60% at 2% 96%, rgba(123, 97, 255, 0.14), transparent 60%),
    linear-gradient(172deg, #081A33 0%, #040B16 100%);
  border-bottom: 1px solid var(--line);
}

.page-about .about-hero__grid {
  display: grid;
  gap: clamp(28px, 4vw, 56px);
  align-items: end;
  margin-top: clamp(20px, 4vw, 48px);
}

.page-about .about-hero__eyebrow {
  margin: 0 0 clamp(14px, 2vw, 22px);
  color: var(--cyan);
}

.page-about .about-hero__title {
  margin: 0 0 clamp(18px, 2.4vw, 28px);
  color: var(--mist);
}

.page-about .about-hero__lede {
  margin: 0;
  color: rgba(242, 246, 250, 0.84);
}

.page-about .about-hero__aside {
  display: flex;
  flex-direction: column;
  gap: 18px;
  align-items: flex-start;
  padding-bottom: 6px;
}

.page-about .about-hero__status {
  background: rgba(36, 224, 207, 0.12);
  color: var(--cyan-soft);
  border: 1px solid var(--line-cyan);
}

.page-about .about-hero__meta {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 14px 20px;
  margin: 0;
  width: 100%;
}

.page-about .about-hero__meta dt {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.16em;
  color: var(--slate);
}

.page-about .about-hero__meta dd {
  margin: 5px 0 0;
  font-size: 15px;
  color: var(--mist);
}

.page-about .about-hero__note {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.2em;
  color: var(--cyan-soft);
  opacity: 0.72;
}

/* 章节索引轨道 */
.page-about .about-index {
  display: flex;
  gap: 10px;
  overflow-x: auto;
  padding: clamp(24px, 4vw, 40px) var(--edge) 0;
  scrollbar-width: none;
}

.page-about .about-index::-webkit-scrollbar {
  display: none;
}

.page-about .about-index__item {
  flex: 0 0 auto;
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 10px 18px;
  border: 1px solid var(--line);
  border-radius: var(--pill);
  background: rgba(16, 43, 78, 0.5);
  color: var(--mist);
  text-decoration: none;
  font-size: 14px;
  transition: border-color 0.24s var(--ease), background 0.24s var(--ease), transform 0.24s var(--ease);
}

.page-about .about-index__item:hover,
.page-about .about-index__item:focus-visible {
  border-color: var(--line-cyan);
  background: rgba(36, 224, 207, 0.12);
  transform: translateY(-1px);
}

.page-about .about-index__item[aria-current="true"] {
  border-color: var(--cyan);
  background: rgba(36, 224, 207, 0.18);
  color: var(--cyan-soft);
}

.page-about .about-index__num {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--cyan);
}

.page-about .about-index__label {
  white-space: nowrap;
}

/* 章节骨架 */
.page-about .about-chapter__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(18px, 3vw, 44px);
}

.page-about .about-chapter__body {
  min-width: 0;
}

.page-about .about-rail {
  display: flex;
  align-items: center;
  gap: 12px;
}

.page-about .about-rail__num {
  font-family: var(--font-mono);
  font-size: clamp(26px, 4vw, 40px);
  line-height: 1;
  color: var(--cyan);
}

.page-about .about-rail__label {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.24em;
  text-transform: uppercase;
  color: var(--slate);
}

.page-about .about-rail__note {
  display: none;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.3em;
  color: var(--cyan-soft);
  opacity: 0.7;
}

.page-about .about-h2 {
  margin: 0 0 clamp(16px, 2.2vw, 24px);
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(26px, 4.4vw, 52px);
  line-height: 1.14;
  letter-spacing: -0.03em;
  color: var(--mist);
}

.page-about .about-text {
  margin: 0 0 clamp(16px, 2vw, 22px);
  max-width: 68ch;
  font-size: clamp(16px, 1.15vw, 17px);
  line-height: 1.85;
  color: rgba(242, 246, 250, 0.84);
}

.page-about .about-text--tight {
  margin-top: clamp(20px, 3vw, 30px);
}

/* 浅底章节 */
.page-about .about-light {
  color: var(--about-deep-text);
}

.page-about .about-light .about-h2 {
  color: #06121F;
}

.page-about .about-light .about-text {
  color: var(--about-mid-text);
}

.page-about .about-light .about-rail__num {
  color: var(--violet);
}

.page-about .about-light .about-rail__label {
  color: #647E96;
}

.page-about .about-light .about-rail__note {
  color: #3F7E86;
  opacity: 1;
}

/* 定位章节的图文与要点 */
.page-about .about-split {
  display: grid;
  gap: clamp(20px, 3vw, 32px);
  margin-top: clamp(22px, 3vw, 36px);
}

.page-about .about-frame {
  margin: 0;
  border-radius: var(--r-lg);
  overflow: hidden;
  border: 1px solid var(--line);
  background: var(--midnight);
}

.page-about .about-frame img {
  width: 100%;
  object-fit: cover;
}

.page-about .about-caption {
  margin: 10px 0 0;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--slate);
}

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

.page-about .about-fact {
  display: grid;
  gap: 4px;
  padding: 14px 18px;
  border-left: 2px solid var(--cyan);
  border-radius: 0 var(--r-sm) var(--r-sm) 0;
  background: rgba(36, 224, 207, 0.06);
}

.page-about .about-fact__key {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.16em;
  color: var(--cyan);
}

.page-about .about-fact__val {
  font-size: 15px;
  line-height: 1.7;
  color: rgba(242, 246, 250, 0.88);
}

/* 四步方法 */
.page-about .about-steps {
  list-style: none;
  margin: clamp(22px, 3vw, 34px) 0 0;
  padding: 0;
  display: grid;
  gap: clamp(16px, 2vw, 22px);
}

.page-about .about-step {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: clamp(14px, 2vw, 24px);
  align-items: start;
  padding: clamp(16px, 2.4vw, 24px) clamp(16px, 2.4vw, 26px);
  border-radius: var(--r-md);
  background: rgba(255, 255, 255, 0.72);
  border: 1px solid rgba(8, 26, 51, 0.08);
  box-shadow: 0 18px 40px -36px rgba(4, 11, 22, 0.7);
}

.page-about .about-step__num {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 46px;
  height: 46px;
  border-radius: var(--pill);
  background: var(--space);
  color: var(--cyan);
  font-size: 13px;
  letter-spacing: 0.06em;
}

.page-about .about-step__title {
  margin: 0 0 8px;
  font-family: var(--font-display);
  font-size: clamp(18px, 1.8vw, 22px);
  letter-spacing: -0.01em;
  color: #06121F;
}

.page-about .about-step__text {
  margin: 0;
  font-size: 16px;
  line-height: 1.8;
  color: var(--about-mid-text);
}

/* 时间线 */
.page-about .about-timeline {
  position: relative;
  margin-top: clamp(20px, 3vw, 34px);
}

.page-about .about-timeline__svg {
  display: none;
  width: 100%;
  height: auto;
}

.page-about .about-timeline__path {
  fill: none;
  stroke: var(--line-cyan);
  stroke-width: 2;
  stroke-dasharray: 6 8;
}

.page-about .about-timeline__dot {
  fill: var(--space);
  stroke: var(--cyan);
  stroke-width: 3;
}

.page-about .about-timeline__list {
  list-style: none;
  margin: 0;
  padding: 0 0 0 22px;
  display: grid;
  gap: 14px;
  border-left: 1px solid var(--line-cyan);
}

.page-about .about-timeline__item {
  position: relative;
}

.page-about .about-timeline__item::before {
  content: "";
  position: absolute;
  left: -28px;
  top: 22px;
  width: 11px;
  height: 11px;
  border-radius: var(--pill);
  background: var(--space);
  border: 2px solid var(--cyan);
}

.page-about .about-stage {
  border-radius: var(--r-md);
  border: 1px solid var(--line);
  background: var(--about-card);
  overflow: hidden;
}

.page-about .about-stage__summary {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 10px 16px;
  padding: clamp(14px, 2vw, 20px) clamp(16px, 2vw, 22px);
  cursor: pointer;
  list-style: none;
}

.page-about .about-stage__summary::-webkit-details-marker {
  display: none;
}

.page-about .about-stage__summary::after {
  content: "＋";
  margin-left: auto;
  font-family: var(--font-mono);
  font-size: 15px;
  color: var(--cyan);
}

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

.page-about .about-stage__year {
  font-size: 13px;
  letter-spacing: 0.12em;
  color: var(--cyan);
}

.page-about .about-stage__title {
  font-family: var(--font-display);
  font-size: clamp(16px, 1.6vw, 19px);
  color: var(--mist);
}

.page-about .about-stage__text {
  margin: 0;
  padding: 0 clamp(16px, 2vw, 22px) clamp(16px, 2vw, 22px);
  font-size: 15px;
  line-height: 1.8;
  color: rgba(242, 246, 250, 0.78);
}

.page-about .about-frame--timeline {
  margin-top: clamp(22px, 3vw, 34px);
}

/* 团队矩阵 */
.page-about .about-metrics {
  list-style: none;
  margin: clamp(22px, 3vw, 32px) 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
}

.page-about .about-metric {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 4px 6px;
  padding: clamp(16px, 2.2vw, 22px);
  border-radius: var(--r-md);
  background: linear-gradient(160deg, rgba(36, 224, 207, 0.12), rgba(16, 43, 78, 0.6));
  border: 1px solid var(--line-cyan);
}

.page-about .about-metric__num {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(30px, 4vw, 42px);
  line-height: 1;
  letter-spacing: -0.03em;
  color: var(--cyan-soft);
}

.page-about .about-metric__unit {
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--cyan);
}

.page-about .about-metric__label {
  flex: 1 0 100%;
  margin-top: 10px;
  font-size: 14px;
  line-height: 1.7;
  color: rgba(242, 246, 250, 0.76);
}

.page-about .about-roles {
  display: grid;
  gap: 10px;
  margin-top: clamp(18px, 2.4vw, 26px);
}

.page-about .about-role {
  border-radius: var(--r-sm);
  border: 1px solid var(--line);
  background: rgba(8, 26, 51, 0.6);
}

.page-about .about-role__summary {
  position: relative;
  padding: 14px 46px 14px 18px;
  cursor: pointer;
  list-style: none;
  font-family: var(--font-display);
  font-size: 16px;
  color: var(--mist);
}

.page-about .about-role__summary::-webkit-details-marker {
  display: none;
}

.page-about .about-role__summary::after {
  content: "＋";
  position: absolute;
  right: 18px;
  top: 50%;
  transform: translateY(-50%);
  font-family: var(--font-mono);
  font-size: 14px;
  color: var(--cyan);
}

.page-about .about-role[open] .about-role__summary::after {
  content: "－";
}

.page-about .about-role__text {
  margin: 0;
  padding: 0 18px 16px;
  font-size: 15px;
  line-height: 1.8;
  color: rgba(242, 246, 250, 0.78);
}

/* 本地节点 */
.page-about .about-local {
  display: grid;
  gap: clamp(20px, 3vw, 34px);
  margin-top: clamp(16px, 2vw, 22px);
}

.page-about .about-frame--local {
  border-radius: var(--r-lg) var(--r-lg) 120px var(--r-lg);
  max-width: 420px;
  border-color: rgba(8, 26, 51, 0.1);
}

.page-about .about-frame--local img {
  width: 100%;
  object-fit: cover;
}

.page-about .about-local__list {
  list-style: none;
  margin: 0 0 clamp(20px, 2.4vw, 26px);
  padding: 0;
  display: grid;
  gap: 10px;
}

.page-about .about-local__item {
  display: grid;
  gap: 4px;
  padding: 14px 18px;
  border-radius: var(--r-sm);
  background: rgba(255, 255, 255, 0.75);
  border: 1px solid rgba(8, 26, 51, 0.08);
}

.page-about .about-local__name {
  font-family: var(--font-display);
  font-size: 16px;
  color: #06121F;
}

.page-about .about-local__desc {
  font-size: 15px;
  line-height: 1.75;
  color: var(--about-mid-text);
}

.page-about .about-local__btn {
  align-self: start;
}

/* 场景列表 */
.page-about .about-scenes {
  list-style: none;
  margin: clamp(20px, 3vw, 30px) 0 0;
  padding: 0;
  display: grid;
  gap: 12px;
}

.page-about .about-scene {
  display: grid;
  gap: 14px;
  padding: clamp(16px, 2.4vw, 24px);
  border-radius: var(--r-md);
  border: 1px solid var(--line);
  background: var(--about-card);
  transition: border-color 0.24s var(--ease), transform 0.24s var(--ease);
}

.page-about .about-scene:hover {
  border-color: var(--line-cyan);
  transform: translateY(-2px);
}

.page-about .about-scene__title {
  margin: 0 0 8px;
  font-family: var(--font-display);
  font-size: clamp(17px, 1.7vw, 20px);
  line-height: 1.4;
  color: var(--mist);
}

.page-about .about-scene__text {
  margin: 0;
  font-size: 15px;
  line-height: 1.8;
  color: rgba(242, 246, 250, 0.76);
}

.page-about .about-scene__link {
  justify-self: start;
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.06em;
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid var(--line-cyan);
  padding-bottom: 2px;
}

.page-about .about-scene__link:hover,
.page-about .about-scene__link:focus-visible {
  color: var(--cyan-soft);
  border-bottom-color: var(--cyan);
}

/* 收尾行动 */
.page-about .about-cta__inner {
  display: grid;
  gap: clamp(22px, 3vw, 40px);
  align-items: end;
}

.page-about .about-cta__title {
  margin-bottom: clamp(12px, 1.6vw, 18px);
}

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

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

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

.page-about .to-top[hidden] {
  display: none;
}

@media (min-width: 720px) {
  .page-about .about-split {
    grid-template-columns: minmax(0, 1.2fr) minmax(0, 0.8fr);
    align-items: start;
  }

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

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

  .page-about .about-scene__link {
    justify-self: end;
  }

  .page-about .about-cta__inner {
    grid-template-columns: minmax(0, 1.4fr) auto;
  }
}

@media (min-width: 900px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 8fr) minmax(0, 4fr);
  }

  .page-about .about-hero__aside {
    border-left: 1px solid var(--line-cyan);
    padding-left: clamp(18px, 2.4vw, 30px);
  }

  .page-about .about-chapter__grid {
    grid-template-columns: minmax(120px, 3fr) minmax(0, 7fr);
    gap: clamp(24px, 4vw, 56px);
    align-items: start;
  }

  .page-about .about-rail {
    position: sticky;
    top: 96px;
    flex-direction: column;
    align-items: flex-start;
    gap: 14px;
  }

  .page-about .about-rail__note {
    display: block;
    writing-mode: vertical-rl;
    letter-spacing: 0.34em;
    margin-top: 6px;
  }

  .page-about .about-timeline {
    padding-top: 10px;
  }

  .page-about .about-timeline__svg {
    display: block;
    margin-bottom: -18px;
  }

  .page-about .about-timeline__list {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: clamp(14px, 2vw, 24px);
    padding-left: 0;
    border-left: 0;
  }

  .page-about .about-timeline__item::before {
    display: none;
  }

  .page-about .about-local {
    grid-template-columns: minmax(0, 4fr) minmax(0, 8fr);
    align-items: start;
  }

  .page-about .about-frame--local {
    max-width: none;
  }
}

@media (min-width: 1200px) {
  .page-about .about-split {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
  }
}

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

  .page-about .about-scene:hover,
  .page-about .about-index__item:hover {
    transform: none;
  }
}
<<<END>>>