.page-about {
  --about-line: rgba(169, 199, 217, 0.14);
  --about-line-soft: rgba(169, 199, 217, 0.08);
  display: block;
  background: var(--c-midnight);
  color: var(--c-mist);
  overflow-x: clip;
}

/* ---------- 面包屑 ---------- */
.page-about .breadcrumb {
  padding-top: clamp(18px, 3vw, 30px);
  padding-bottom: 4px;
}

.page-about .breadcrumb-list {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 6px;
  margin: 0;
  padding: 0;
  list-style: none;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.08em;
  color: var(--c-steel);
}

.page-about .breadcrumb-list a {
  color: var(--c-pale);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color var(--dur) var(--ease), border-color var(--dur) var(--ease);
}

.page-about .breadcrumb-list a:hover,
.page-about .breadcrumb-list a:focus-visible {
  color: var(--c-cyan);
  border-bottom-color: var(--c-cyan);
}

.page-about .breadcrumb-list li + li::before {
  content: "/";
  margin-right: 6px;
  color: var(--line-3);
}

.page-about .breadcrumb-list [aria-current="page"] {
  color: var(--c-mist);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  padding-bottom: clamp(36px, 5vw, 64px);
  background-image:
    repeating-linear-gradient(90deg, var(--about-line-soft) 0 1px, transparent 1px 72px),
    repeating-linear-gradient(180deg, var(--about-line-soft) 0 1px, transparent 1px 72px);
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background: radial-gradient(85% 68% at 8% 0%, rgba(229, 50, 45, 0.2), transparent 62%);
  pointer-events: none;
}

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

.page-about .about-hero .container:first-child {
  padding-top: clamp(20px, 3.4vw, 44px);
}

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

.page-about .about-hero__copy h1 {
  margin: 14px 0 0;
  font-family: var(--font-sans);
  font-size: clamp(1.85rem, 5.2vw, 3.5rem);
  font-weight: 800;
  line-height: 1.06;
  letter-spacing: -0.025em;
  color: #fff;
}

.page-about .about-hero__copy h1 em {
  font-style: italic;
  color: var(--c-cyan);
}

.page-about .about-hero__lead {
  margin: 20px 0 0;
  max-width: 48ch;
  font-size: clamp(15px, 1.6vw, 17px);
  line-height: 1.78;
  color: var(--c-pale);
}

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

.page-about .about-hero__figure {
  margin: 0;
  min-width: 0;
}

.page-about .about-hero__figure figcaption {
  margin-top: 10px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.1em;
  color: var(--c-steel);
}

/* ---------- 首屏数据带 ---------- */
.page-about .about-stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin: clamp(26px, 4vw, 46px) 0 0;
  padding: 0;
  list-style: none;
  background: var(--line-2);
  border: 1px solid var(--line-1);
}

.page-about .about-stats li {
  display: flex;
  flex-direction: column;
  gap: 8px;
  padding: 16px 16px 18px;
  background: rgba(11, 27, 51, 0.94);
}

.page-about .about-stats b {
  font-family: var(--font-mono);
  font-size: clamp(20px, 2.6vw, 30px);
  font-weight: 700;
  letter-spacing: -0.02em;
  line-height: 1;
  color: var(--c-cyan);
}

.page-about .about-stats span {
  font-size: 12.5px;
  line-height: 1.6;
  color: var(--c-pale);
}

/* ---------- 通用章节头 ---------- */
.page-about .about-sec-head {
  max-width: 62ch;
  margin-bottom: clamp(26px, 4vw, 42px);
  padding-bottom: 18px;
  border-bottom: 1px solid var(--line-1);
}

.page-about .about-sec-head h2 {
  margin: 12px 0 0;
  font-size: clamp(1.4rem, 3.1vw, 2.15rem);
  font-weight: 800;
  line-height: 1.18;
  letter-spacing: -0.015em;
  color: #fff;
}

.page-about .about-sec-head__note {
  margin: 14px 0 0;
  font-size: 15px;
  line-height: 1.75;
  color: var(--c-pale);
}

/* ---------- 品牌宣言 ---------- */
.page-about .about-manifesto {
  position: relative;
  padding: clamp(48px, 7vw, 96px) 0;
  border-top: 1px solid var(--line-1);
  background:
    radial-gradient(60% 80% at 100% 0%, rgba(56, 242, 208, 0.07), transparent 62%),
    var(--c-navy);
}

.page-about .about-manifesto__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(22px, 3vw, 34px);
}

.page-about .about-manifesto__side {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
}

.page-about .about-manifesto__rule {
  display: block;
  width: 2px;
  height: 56px;
  margin: 16px 0 14px;
  background: linear-gradient(180deg, var(--c-red), transparent);
}

.page-about .about-manifesto__coord {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.12em;
  color: var(--c-steel);
}

.page-about .about-manifesto__body h2 {
  margin: 0 0 18px;
  font-size: clamp(1.35rem, 2.6vw, 1.75rem);
  font-weight: 700;
  letter-spacing: 0.02em;
  color: var(--c-red-bright);
}

.page-about .about-manifesto__big {
  margin: 0 0 20px;
  font-size: clamp(1.15rem, 2.9vw, 1.9rem);
  font-weight: 700;
  line-height: 1.5;
  letter-spacing: -0.01em;
  color: #fff;
}

.page-about .about-manifesto__body p:not(.about-manifesto__big) {
  margin: 0 0 16px;
  max-width: 58ch;
  font-size: 15.5px;
  line-height: 1.85;
  color: var(--c-pale);
}

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

/* ---------- 发展历程 ---------- */
.page-about .about-history {
  padding: clamp(48px, 7vw, 96px) 0;
}

.page-about .about-history__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(26px, 4vw, 44px);
  align-items: start;
}

.page-about .about-timeline {
  position: relative;
  margin: 0;
  padding: 0;
  list-style: none;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 24px;
}

.page-about .about-timeline::before {
  content: "";
  position: absolute;
  left: 9px;
  top: 8px;
  bottom: 8px;
  width: 1px;
  background: linear-gradient(180deg, var(--c-cyan), var(--line-2) 70%, transparent);
}

.page-about .about-timeline__item {
  position: relative;
  padding-left: 36px;
}

.page-about .about-timeline__dot {
  position: absolute;
  left: 0;
  top: 2px;
  width: 19px;
  height: 19px;
  border-radius: 50%;
  border: 1px solid var(--line-3);
  background: var(--c-midnight);
  display: grid;
  place-items: center;
}

.page-about .about-timeline__dot::after {
  content: "";
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--c-cyan);
}

.page-about .about-timeline__label {
  display: inline-block;
  margin-bottom: 8px;
  padding: 2px 7px;
  border: 1px solid var(--line-2);
  font-family: var(--font-mono);
  font-size: 10.5px;
  letter-spacing: 0.12em;
  color: var(--c-cyan);
}

.page-about .about-timeline__title {
  margin: 0 0 8px;
  font-size: 1.02rem;
  font-weight: 700;
  line-height: 1.4;
  color: #fff;
}

.page-about .about-timeline__item p {
  margin: 0;
  font-size: 14px;
  line-height: 1.78;
  color: var(--c-pale);
}

.page-about .about-history__figure {
  margin: 0;
  min-width: 0;
}

.page-about .about-history__figure figcaption {
  margin-top: 10px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.08em;
  line-height: 1.6;
  color: var(--c-steel);
}

/* ---------- 四条路径 ---------- */
.page-about .about-paths {
  position: relative;
  padding: clamp(52px, 7vw, 92px) 0 clamp(56px, 7vw, 96px);
  background: var(--c-navy);
  clip-path: polygon(0 22px, 100% 0, 100% calc(100% - 22px), 0 100%);
}

.page-about .about-pathlist {
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .about-path {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 10px;
  padding: 22px 0;
  border-top: 1px solid var(--line-1);
  transition: background var(--dur) var(--ease);
}

.page-about .about-path:last-child {
  border-bottom: 1px solid var(--line-1);
}

.page-about .about-path__idx {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--c-red-bright);
}

.page-about .about-path__main h3 {
  margin: 0 0 8px;
  font-size: clamp(1rem, 2.2vw, 1.16rem);
  font-weight: 700;
  line-height: 1.45;
  color: #fff;
}

.page-about .about-path__main p {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.8;
  color: var(--c-pale);
}

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

.page-about .about-paths__foot {
  margin: clamp(22px, 3vw, 34px) 0 0;
  padding-left: 14px;
  border-left: 2px solid var(--c-cyan);
  font-size: 14px;
  line-height: 1.8;
  color: var(--c-pale);
}

/* ---------- 校对流程 ---------- */
.page-about .about-audit {
  padding: clamp(52px, 7vw, 96px) 0;
}

.page-about .about-audit__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(26px, 4vw, 44px);
  align-items: start;
}

.page-about .about-audit .tabs {
  min-width: 0;
}

.page-about .about-audit .tablist {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 22px;
}

.page-about .about-audit .tab {
  appearance: none;
  border: 1px solid var(--line-2);
  background: transparent;
  color: var(--c-pale);
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.08em;
  padding: 9px 13px;
  cursor: pointer;
  transition: color var(--dur) var(--ease), border-color var(--dur) var(--ease), background var(--dur) var(--ease);
}

.page-about .about-audit .tab:hover {
  color: var(--c-mist);
  border-color: var(--line-3);
}

.page-about .about-audit .tab[aria-selected="true"] {
  background: rgba(56, 242, 208, 0.1);
  border-color: var(--c-cyan);
  color: var(--c-cyan);
}

.page-about .about-audit .tab:focus-visible {
  outline: 2px solid var(--c-cyan);
  outline-offset: 2px;
}

.page-about .about-audit .tabpanel {
  border-left: 2px solid var(--c-red);
  padding: 4px 0 4px 18px;
}

.page-about .about-audit .tabpanel h3 {
  margin: 0 0 10px;
  font-size: 1.05rem;
  font-weight: 700;
  color: #fff;
}

.page-about .about-audit .tabpanel > p {
  margin: 0 0 14px;
  font-size: 14.5px;
  line-height: 1.82;
  color: var(--c-pale);
}

.page-about .about-audit .tabpanel ul {
  margin: 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 8px;
}

.page-about .about-audit .tabpanel li {
  position: relative;
  padding-left: 18px;
  font-size: 13.5px;
  line-height: 1.7;
  color: var(--c-mist);
}

.page-about .about-audit .tabpanel li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 8px;
  width: 6px;
  height: 6px;
  background: var(--c-cyan);
  transform: rotate(45deg);
}

.page-about .about-audit__figure {
  margin: 0;
  min-width: 0;
}

.page-about .about-audit__figure figcaption {
  margin-top: 10px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.08em;
  line-height: 1.6;
  color: var(--c-steel);
}

/* ---------- 团队 ---------- */
.page-about .about-team {
  padding: clamp(48px, 7vw, 92px) 0;
  background:
    radial-gradient(70% 90% at 0% 100%, rgba(229, 50, 45, 0.12), transparent 60%),
    var(--c-navy);
  border-top: 1px solid var(--line-1);
  border-bottom: 1px solid var(--line-1);
}

.page-about .about-team__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1px;
  margin: 0;
  padding: 0;
  list-style: none;
  background: var(--line-1);
  border: 1px solid var(--line-1);
}

.page-about .about-team__cell {
  display: flex;
  flex-direction: column;
  gap: 8px;
  padding: 22px 18px 24px;
  background: rgba(7, 16, 31, 0.86);
}

.page-about .about-team__num {
  font-family: var(--font-mono);
  font-size: clamp(30px, 4.4vw, 46px);
  font-weight: 700;
  line-height: 1;
  letter-spacing: -0.03em;
  color: var(--c-mist);
}

.page-about .about-team__cell:nth-child(1) .about-team__num,
.page-about .about-team__cell:nth-child(3) .about-team__num {
  color: var(--c-cyan);
}

.page-about .about-team__cell h3 {
  margin: 0;
  font-size: 0.98rem;
  font-weight: 700;
  color: #fff;
}

.page-about .about-team__cell p {
  margin: 0;
  font-size: 13.5px;
  line-height: 1.78;
  color: var(--c-pale);
}

/* ---------- 收尾 ---------- */
.page-about .about-close {
  padding: clamp(48px, 7vw, 88px) 0 clamp(54px, 8vw, 100px);
}

.page-about .about-close__inner {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(22px, 3vw, 36px);
  align-items: end;
}

.page-about .about-close__copy h2 {
  margin: 12px 0 16px;
  font-size: clamp(1.4rem, 3.2vw, 2.1rem);
  font-weight: 800;
  line-height: 1.2;
  letter-spacing: -0.015em;
  color: #fff;
}

.page-about .about-close__copy p:not(.eyebrow) {
  margin: 0;
  max-width: 56ch;
  font-size: 15px;
  line-height: 1.82;
  color: var(--c-pale);
}

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

/* ---------- 入场揭示 ---------- */
.page-about [data-reveal][data-revealed="true"] {
  animation: about-rise 0.55s var(--ease) both;
}

@keyframes about-rise {
  from {
    opacity: 0;
    transform: translateY(16px);
  }
  to {
    opacity: 1;
    transform: none;
  }
}

/* ---------- 断点 ---------- */
@media (min-width: 620px) {
  .page-about .about-path {
    grid-template-columns: 46px minmax(0, 1fr) auto;
    align-items: start;
    gap: 16px;
    padding: 26px 0;
  }

  .page-about .about-path__idx {
    padding-top: 4px;
  }

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

@media (min-width: 860px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, 0.95fr);
    align-items: end;
    gap: clamp(28px, 4vw, 56px);
  }

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

  .page-about .about-manifesto__grid {
    grid-template-columns: 210px minmax(0, 1fr);
    gap: clamp(28px, 4vw, 56px);
  }

  .page-about .about-manifesto__side {
    padding-top: 6px;
  }

  .page-about .about-audit__grid {
    grid-template-columns: minmax(0, 1.15fr) minmax(0, 0.85fr);
  }

  .page-about .about-close__inner {
    grid-template-columns: minmax(0, 1fr) auto;
    gap: clamp(28px, 4vw, 56px);
  }

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

@media (min-width: 980px) {
  .page-about .about-history__grid {
    grid-template-columns: minmax(0, 1.42fr) minmax(0, 1fr);
    gap: clamp(30px, 4vw, 52px);
  }

  .page-about .about-timeline {
    grid-auto-flow: column;
    grid-auto-columns: minmax(196px, 1fr);
    grid-template-columns: none;
    gap: 0;
    padding-top: 44px;
    overflow-x: auto;
    padding-bottom: 6px;
    scrollbar-width: thin;
  }

  .page-about .about-timeline::before {
    left: 0;
    right: 0;
    top: 9px;
    bottom: auto;
    width: auto;
    height: 1px;
    background: linear-gradient(90deg, var(--c-cyan), var(--line-2) 72%, transparent);
  }

  .page-about .about-timeline__item {
    position: relative;
    padding: 0 22px 0 0;
  }

  .page-about .about-timeline__dot {
    top: -44px;
    left: 0;
  }

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

@media (prefers-reduced-motion: reduce) {
  .page-about [data-reveal][data-revealed="true"] {
    animation: none;
  }

  .page-about .about-path,
  .page-about .about-audit .tab {
    transition: none;
  }
}
<<<END>>>