.page-about {
  --about-side: 300px;
  position: relative;
  background: var(--ink);
  color: var(--snow);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  padding: clamp(88px, 13vw, 148px) 0 clamp(36px, 6vw, 68px);
  overflow: hidden;
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  inset: -30% -15% auto -15%;
  height: 140%;
  background:
    radial-gradient(48% 42% at 22% 26%, rgba(23, 67, 160, 0.58), transparent 72%),
    radial-gradient(34% 36% at 84% 8%, rgba(43, 227, 208, 0.2), transparent 70%),
    radial-gradient(30% 30% at 60% 78%, rgba(106, 44, 214, 0.22), transparent 72%);
  pointer-events: none;
  z-index: 0;
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(to right, var(--line-soft) 1px, transparent 1px),
    linear-gradient(to bottom, var(--line-soft) 1px, transparent 1px);
  background-size: 32px 32px;
  -webkit-mask-image: radial-gradient(72% 62% at 28% 32%, #000 0%, transparent 78%);
  mask-image: radial-gradient(72% 62% at 28% 32%, #000 0%, transparent 78%);
  pointer-events: none;
  z-index: 0;
}

.page-about .about-hero__inner {
  position: relative;
  z-index: 1;
  display: grid;
  gap: 34px;
}

.page-about .about-hero__copy {
  display: grid;
  gap: 16px;
  align-content: start;
  min-width: 0;
}

.page-about .h1 {
  margin: 0;
  font-size: clamp(30px, 5.4vw, 56px);
  line-height: 1.14;
  letter-spacing: -0.025em;
}

.page-about .h2 {
  margin: 0;
  font-size: clamp(23px, 3.5vw, 34px);
  line-height: 1.24;
  letter-spacing: -0.015em;
}

.page-about .h3 {
  margin: 0;
  font-size: 18px;
  line-height: 1.42;
  letter-spacing: -0.01em;
}

.page-about .lede {
  color: var(--text-soft);
}

.page-about .measure {
  max-width: 42em;
}

.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin: 6px 0 0;
}

.page-about .about-stats {
  list-style: none;
  margin: 18px 0 0;
  padding: 20px 0 0;
  border-top: 1px solid var(--line);
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 12px;
}

.page-about .about-stat {
  display: grid;
  gap: 4px;
  min-width: 0;
}

.page-about .about-stat__num {
  font-size: clamp(20px, 5vw, 30px);
  font-weight: 700;
  line-height: 1.08;
  letter-spacing: -0.02em;
  color: var(--snow);
}

.page-about .about-stat__label {
  font-size: 12px;
  color: var(--steel);
  line-height: 1.5;
}

.page-about .about-hero__media {
  position: relative;
  margin: 0;
  clip-path: polygon(7% 0, 100% 0, 100% 100%, 0 100%);
  background: var(--ink-2);
}

.page-about .about-hero__media img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 14 / 9;
  object-fit: cover;
}

.page-about .about-hero__media::before {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(200deg, rgba(43, 227, 208, 0.24), transparent 44%),
    linear-gradient(20deg, rgba(255, 106, 26, 0.18), transparent 50%);
  pointer-events: none;
  z-index: 1;
}

/* ---------- 主体分栏 ---------- */
.page-about .about-split {
  display: grid;
  gap: 38px;
  padding-top: clamp(12px, 3vw, 28px);
  padding-bottom: clamp(20px, 4vw, 40px);
}

.page-about .about-main {
  display: grid;
  gap: clamp(40px, 6vw, 76px);
  min-width: 0;
}

.page-about .about-section {
  display: grid;
  gap: 14px;
  min-width: 0;
}

.page-about .about-section p {
  margin: 0;
  color: var(--text-soft);
  line-height: 1.78;
}

.page-about .about-section .h3 + p,
.page-about .about-capability p,
.page-about .about-role p,
.page-about .about-reason p,
.page-about .about-phase p {
  margin: 0;
  font-size: 15px;
  line-height: 1.72;
  color: var(--text-soft);
}

/* ---------- 图片容器 ---------- */
.page-about .about-figure {
  margin: 6px 0;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
  background: var(--ink-2);
}

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

.page-about .about-figure--wide img {
  aspect-ratio: 2 / 1;
}

.page-about .about-figure--half img {
  aspect-ratio: 3 / 2;
}

/* ---------- 三类能力 ---------- */
.page-about .about-capabilities {
  display: grid;
  gap: 18px;
  margin-top: 6px;
}

.page-about .about-capability {
  position: relative;
  padding: 26px 20px 22px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: linear-gradient(158deg, rgba(14, 30, 51, 0.96), rgba(7, 11, 18, 0.96));
  display: grid;
  gap: 10px;
  min-width: 0;
}

.page-about .about-capability::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 76px;
  height: 3px;
  background: linear-gradient(90deg, var(--flame), var(--neon));
}

.page-about .about-capability__idx {
  font-size: 12px;
  letter-spacing: 0.2em;
  color: var(--steel);
}

/* ---------- 更新节奏 / 折叠数字卡 ---------- */
.page-about .about-details {
  display: grid;
  gap: 10px;
  margin-top: 8px;
}

.page-about .about-detail {
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: rgba(14, 30, 51, 0.72);
  padding: 0 16px;
  transition: border-color var(--dur) var(--ease), background var(--dur) var(--ease);
}

.page-about .about-detail[open] {
  border-color: rgba(255, 106, 26, 0.45);
  background: rgba(14, 30, 51, 0.96);
}

.page-about .about-detail summary {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 8px;
  padding: 16px 0;
  cursor: pointer;
  list-style: none;
}

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

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

.page-about .about-detail summary:focus-visible {
  outline: 2px solid var(--ice);
  outline-offset: 3px;
  border-radius: 2px;
}

.page-about .about-detail__num {
  font-size: 26px;
  font-weight: 700;
  line-height: 1;
  letter-spacing: -0.01em;
  color: var(--flame);
}

.page-about .about-detail__unit {
  font-size: 13px;
  color: var(--steel);
}

.page-about .about-detail__label {
  flex: 0 0 100%;
  font-size: 13px;
  color: var(--text-soft);
}

.page-about .about-detail p {
  margin: 0 0 16px;
  font-size: 14px;
  line-height: 1.72;
  color: var(--text-soft);
}

/* ---------- 团队角色 ---------- */
.page-about .about-roles {
  display: grid;
  gap: 14px;
  margin-top: 6px;
}

.page-about .about-role {
  display: grid;
  gap: 10px;
  align-content: start;
  padding: 20px 18px;
  border: 1px solid var(--line);
  border-left: 2px solid var(--blue);
  border-radius: var(--radius);
  background: var(--ink-2);
  min-width: 0;
  transition: transform var(--dur) var(--ease), border-left-color var(--dur) var(--ease);
}

.page-about .about-role:hover {
  transform: translateY(-4px);
  border-left-color: var(--flame);
}

.page-about .about-role .tag {
  justify-self: start;
}

/* ---------- 发展节点时间线 ---------- */
.page-about .about-timeline {
  list-style: none;
  margin: 8px 0 0;
  padding: 0;
  display: grid;
  gap: 30px;
}

.page-about .about-timeline__row {
  display: grid;
  gap: 12px;
  min-width: 0;
}

.page-about .about-timeline__marker {
  position: relative;
  padding-left: 30px;
  display: flex;
  flex-direction: column;
  gap: 3px;
  min-height: 40px;
}

.page-about .about-timeline__dot {
  position: absolute;
  left: 0;
  top: 6px;
  width: 14px;
  height: 14px;
  border-radius: 50%;
  background: var(--flame);
  box-shadow: 0 0 0 5px rgba(255, 106, 26, 0.15);
}

.page-about .about-timeline__marker::before {
  content: "";
  position: absolute;
  left: 6px;
  top: 28px;
  bottom: -34px;
  width: 2px;
  background: linear-gradient(180deg, rgba(255, 106, 26, 0.5), rgba(43, 227, 208, 0.12));
}

.page-about .about-timeline__row:last-child .about-timeline__marker::before {
  display: none;
}

.page-about .about-timeline__code {
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.04em;
  color: var(--snow);
}

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

.page-about .about-phase {
  display: grid;
  gap: 10px;
  align-content: start;
  padding: 20px 20px 18px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--ink-2);
  min-width: 0;
}

.page-about .about-phase__meta {
  margin: 0;
  font-size: 12px;
  letter-spacing: 0.04em;
  color: var(--neon);
}

/* ---------- 长期理由 ---------- */
.page-about .about-reasons {
  display: grid;
  gap: 16px;
  margin-top: 6px;
}

.page-about .about-reason {
  display: grid;
  gap: 10px;
  align-content: start;
  padding: 20px 18px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: linear-gradient(142deg, rgba(23, 67, 160, 0.3), rgba(14, 30, 51, 0.92) 58%);
  min-width: 0;
}

/* ---------- 侧栏关键数据 ---------- */
.page-about .about-facts {
  border: 1px solid var(--glass-brd);
  background: var(--glass);
  -webkit-backdrop-filter: blur(12px);
  backdrop-filter: blur(12px);
  border-radius: var(--radius);
  padding: 20px 18px;
}

.page-about .about-facts__title {
  margin: 0 0 14px;
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 500;
  letter-spacing: 0.16em;
  color: var(--steel);
}

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

.page-about .about-facts__row {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: 12px;
  padding: 9px 0;
  border-bottom: 1px solid var(--line-soft);
}

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

.page-about .about-facts__row dt {
  font-size: 13px;
  color: var(--text-soft);
  line-height: 1.5;
}

.page-about .about-facts__row dd {
  margin: 0;
  font-size: 14px;
  font-weight: 600;
  color: var(--neon);
  white-space: nowrap;
}

.page-about .about-facts__link {
  margin-top: 16px;
  width: 100%;
  justify-content: center;
}

/* ---------- 收尾入口 ---------- */
.page-about .about-cta {
  margin-top: clamp(20px, 4vw, 44px);
  padding: clamp(36px, 6vw, 68px) 0;
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line-soft);
  background:
    radial-gradient(78% 130% at 10% 0%, rgba(23, 67, 160, 0.55), transparent 72%),
    radial-gradient(60% 110% at 96% 100%, rgba(255, 106, 26, 0.14), transparent 70%),
    var(--ink-2);
}

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

.page-about .about-cta__copy {
  display: grid;
  gap: 12px;
  min-width: 0;
}

.page-about .about-cta__copy p {
  margin: 0;
  color: var(--text-soft);
  line-height: 1.78;
}

.page-about .about-cta__links {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

/* ---------- 滚动显现（渐进增强） ---------- */
.js .page-about [data-reveal] {
  opacity: 0;
  transform: translateY(16px);
  transition: opacity 260ms var(--ease), transform 260ms var(--ease);
}

.js .page-about [data-reveal].is-in {
  opacity: 1;
  transform: translateY(0);
}

/* ---------- 断点 ---------- */
@media (min-width: 620px) {
  .page-about .about-details {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

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

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

@media (min-width: 820px) {
  .page-about .about-timeline__row {
    grid-template-columns: 168px minmax(0, 1fr);
    gap: 34px;
  }

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

  .page-about .about-stagger > :nth-child(even) {
    margin-top: var(--offset);
  }

  .page-about .about-section--growth .about-timeline {
    margin-top: 14px;
  }
}

@media (min-width: 900px) {
  .page-about .about-hero__inner {
    grid-template-columns: minmax(0, 1.06fr) minmax(0, 0.94fr);
    align-items: center;
    gap: 52px;
  }

  .page-about .about-cta__inner {
    grid-template-columns: minmax(0, 1fr) auto;
    align-items: center;
    gap: 44px;
  }
}

@media (min-width: 1024px) {
  .page-about .about-split {
    grid-template-columns: minmax(0, 1fr) var(--about-side);
    align-items: start;
    gap: 48px;
  }

  .page-about .about-facts {
    position: sticky;
    top: calc(var(--head-h) + 24px);
  }

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

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

@media (min-width: 1280px) {
  .page-about {
    --about-side: 320px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-role,
  .js .page-about [data-reveal] {
    transition: opacity 180ms linear;
    transform: none;
  }

  .page-about .about-role:hover {
    transform: none;
  }
}
<<<END>>>