.page-about {
  position: relative;
  overflow-x: clip;
  --about-veil: rgba(108, 75, 255, 0.06);
}

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

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

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

.page-about :focus-visible {
  outline: 2px solid var(--pulse);
  outline-offset: 2px;
}

.page-about .breadcrumbs {
  padding-block: 22px 4px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.18em;
}

/* 星轨纹理层 */
.page-about .about-grain {
  position: absolute;
  inset: 0;
  z-index: 0;
  pointer-events: none;
  background-image:
    repeating-linear-gradient(112deg, rgba(207, 230, 255, 0.05) 0 1px, transparent 1px 24px),
    repeating-linear-gradient(68deg, rgba(108, 75, 255, 0.07) 0 1px, transparent 1px 40px);
}

/* 首屏 */
.page-about .about-hero {
  position: relative;
  overflow: hidden;
  padding-block: clamp(56px, 8vw, 132px) clamp(56px, 8vw, 120px);
}

.page-about .about-hero__blade {
  position: absolute;
  right: -14%;
  bottom: -36%;
  width: min(920px, 92%);
  height: 74%;
  background: linear-gradient(118deg, rgba(108, 75, 255, 0.34), rgba(34, 211, 238, 0.1) 62%, transparent);
  clip-path: polygon(16% 0, 100% 0, 100% 100%, 0 100%);
  pointer-events: none;
  z-index: 0;
}

.page-about .about-hero__grid {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(32px, 5vw, 56px);
}

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

.page-about .about-hero__eyebrow {
  margin: 0;
  color: var(--fg-muted);
}

.page-about .about-hero__title {
  margin: 14px 0 0;
  font-size: clamp(34px, 6.6vw, 84px);
  font-weight: 200;
  line-height: 1.04;
  letter-spacing: -0.03em;
}

.page-about .about-hero__lead {
  margin-top: 26px;
  max-width: 54ch;
}

.page-about .about-toc {
  border-top: 1px solid var(--line);
  padding-top: 16px;
}

.page-about .about-toc__key {
  margin: 0 0 14px;
  color: var(--fg-muted);
}

.page-about .about-toc ul {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 2px;
}

.page-about .about-toc a {
  display: flex;
  gap: 12px;
  align-items: baseline;
  padding: 9px 0;
  color: var(--fg);
  text-decoration: none;
  font-size: 14px;
  border-bottom: 1px solid transparent;
  transition: border-color 0.18s var(--ease), color 0.18s var(--ease);
}

.page-about .about-toc a:hover {
  border-bottom-color: var(--pulse);
}

.page-about .about-toc__idx {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.18em;
  color: var(--fg-muted);
}

/* 章节头 */
.page-about .about-chapter {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 14px;
  margin-bottom: clamp(30px, 4.5vw, 56px);
}

.page-about .about-chapter__num {
  margin: 0;
  color: var(--fg-muted);
}

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

.page-about .about-title {
  margin: 0;
  font-size: clamp(30px, 5.4vw, 72px);
  font-weight: 200;
  line-height: 1.02;
  letter-spacing: -0.03em;
}

.page-about .about-chapter__note {
  margin: 12px 0 0;
  max-width: 56ch;
  color: var(--fg-muted);
  font-size: 15px;
  line-height: 1.72;
}

/* 沿革 */
.page-about .about-history {
  position: relative;
}

.page-about .about-history__banner {
  margin: 0 0 clamp(34px, 5vw, 60px);
}

.page-about .about-history__banner img {
  display: block;
  width: 100%;
  border-radius: var(--radius-lg);
  object-fit: cover;
}

.page-about .about-axis {
  position: relative;
  padding-left: 30px;
}

.page-about .about-axis::before {
  content: "";
  position: absolute;
  left: 7px;
  top: 12px;
  bottom: 12px;
  width: 1px;
  background: var(--line);
}

.page-about .about-axis .accordion__item {
  position: relative;
  border-bottom: 1px solid var(--line);
}

.page-about .about-axis .accordion__item::before {
  content: "";
  position: absolute;
  left: -30px;
  top: 26px;
  width: 15px;
  height: 15px;
  border-radius: 50%;
  border: 1px solid var(--line);
  background: var(--paper);
  transition: border-color 0.18s var(--ease), background-color 0.18s var(--ease);
}

.page-about .about-axis .accordion__item:hover::before {
  border-color: var(--nebula);
  background: var(--nebula);
}

.page-about .about-axis__head {
  margin: 0;
  font-weight: inherit;
}

.page-about .about-axis__trigger {
  display: flex;
  flex-wrap: wrap;
  gap: 6px 18px;
  align-items: baseline;
  width: 100%;
  padding: 20px 0;
  background: none;
  border: 0;
  color: inherit;
  font: inherit;
  text-align: left;
  cursor: pointer;
}

.page-about .about-axis__year {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.18em;
  color: var(--nebula);
  white-space: nowrap;
}

.page-about .about-axis__label {
  font-size: clamp(17px, 2.1vw, 23px);
  font-weight: 300;
  letter-spacing: 0.01em;
  transition: color 0.18s var(--ease);
}

.page-about .about-axis__trigger:hover .about-axis__label {
  color: var(--nebula);
}

.page-about .about-axis__panel {
  padding: 0 0 26px;
  max-width: 62ch;
  color: var(--fg-muted);
  font-size: 15px;
  line-height: 1.72;
}

.page-about .about-axis__panel p {
  margin: 0;
}

/* 团队 */
.page-about .about-team {
  position: relative;
}

.page-about .about-team__figure {
  margin: 0 0 clamp(34px, 5vw, 60px);
}

.page-about .about-team__figure img {
  display: block;
  width: 100%;
  border-radius: var(--radius-lg);
  object-fit: cover;
}

.page-about .about-roles {
  list-style: none;
  margin: 0;
  padding: 0;
  border-top: 1px solid var(--line);
}

.page-about .about-roles__row {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 6px 28px;
  padding: 22px 0;
  border-bottom: 1px solid var(--line);
  transition: background-color 0.18s var(--ease);
}

.page-about .about-roles__row:hover {
  background: var(--about-veil);
}

.page-about .about-roles__count {
  font-family: var(--font-mono);
  font-size: clamp(22px, 3vw, 32px);
  line-height: 1;
  color: var(--fg);
}

.page-about .about-roles__name {
  font-size: 16px;
  letter-spacing: 0.04em;
}

.page-about .about-roles__desc {
  margin: 0;
  color: var(--fg-muted);
  font-size: 15px;
  line-height: 1.72;
  max-width: 62ch;
}

/* 核对流程 */
.page-about .about-flow {
  position: relative;
}

.page-about .about-flow__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(32px, 5vw, 56px);
}

.page-about .about-flow__steps {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 32px;
}

.page-about .about-flow__step {
  position: relative;
  padding: 26px 0 0;
  border-top: 2px solid var(--line);
}

.page-about .about-flow__step::before {
  content: "";
  position: absolute;
  top: -2px;
  left: 0;
  width: 46px;
  height: 2px;
  background: var(--nebula);
  transition: width 0.18s var(--ease);
}

.page-about .about-flow__step:hover::before,
.page-about .about-flow__step:focus-within::before {
  width: 100%;
}

.page-about .about-flow__step h3 {
  margin: 10px 0 10px;
  font-size: 22px;
  font-weight: 400;
  letter-spacing: 0.02em;
}

.page-about .about-flow__step p {
  margin: 0;
  color: var(--fg-muted);
  font-size: 15px;
  line-height: 1.72;
}

.page-about .about-flow__trace {
  list-style: none;
  margin: 16px 0 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.page-about .about-flow__trace li {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.1em;
  padding: 5px 11px;
  border-radius: 999px;
  border: 1px solid var(--line);
  color: var(--fg-muted);
  transition: color 0.18s var(--ease), border-color 0.18s var(--ease), background-color 0.18s var(--ease);
}

.page-about .about-flow__step:hover .about-flow__trace li,
.page-about .about-flow__step:focus-within .about-flow__trace li {
  color: var(--fg);
  border-color: var(--nebula);
  background: rgba(108, 75, 255, 0.08);
}

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

.page-about .about-flow__figure img {
  display: block;
  width: 100%;
  border-radius: var(--radius-md);
  object-fit: cover;
}

.page-about .about-flow__note {
  margin: clamp(34px, 5vw, 56px) 0 0;
  padding-top: 22px;
  border-top: 1px solid var(--line);
  max-width: 68ch;
  font-size: 15px;
  line-height: 1.72;
  color: var(--fg-muted);
}

/* 来源与协作 */
.page-about .about-sources {
  position: relative;
}

.page-about .about-sources__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(32px, 4.5vw, 56px);
}

.page-about .about-sources__main,
.page-about .about-sources__side {
  min-width: 0;
}

.page-about .about-sources__block + .about-sources__block {
  margin-top: 30px;
}

.page-about .about-sources__block h3,
.page-about .about-sources__side h3 {
  margin: 0 0 10px;
  font-size: 18px;
  font-weight: 500;
  letter-spacing: 0.04em;
}

.page-about .about-sources__block p {
  margin: 0;
  max-width: 58ch;
  color: var(--fg-muted);
  font-size: 15px;
  line-height: 1.72;
}

.page-about .about-versions {
  list-style: none;
  margin: 0;
  padding: 0;
  border-top: 1px solid var(--line);
}

.page-about .about-versions li {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 4px 16px;
  padding: 16px 0;
  border-bottom: 1px solid var(--line);
}

.page-about .about-versions__tag {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.16em;
  color: var(--nebula);
}

.page-about .about-versions__text {
  color: var(--fg-muted);
  font-size: 14px;
  line-height: 1.66;
}

.page-about .about-sources__aside {
  margin: 18px 0 0;
  max-width: 46ch;
  color: var(--fg-muted);
  font-size: 13px;
  line-height: 1.7;
}

/* 更正记录 */
.page-about .about-corrections {
  position: relative;
}

.page-about .about-ledger {
  list-style: none;
  margin: 0;
  padding: 0;
  border-top: 1px solid var(--line);
}

.page-about .about-ledger__row {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 8px 20px;
  padding: 20px 0;
  border-bottom: 1px solid var(--line);
  transition: background-color 0.18s var(--ease);
}

.page-about .about-ledger__row:hover {
  background: rgba(108, 75, 255, 0.05);
}

.page-about .about-ledger__text {
  margin: 0;
  font-size: 15px;
  line-height: 1.72;
  max-width: 66ch;
}

.page-about .about-ledger__num {
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.1em;
  color: var(--fg-muted);
  white-space: nowrap;
}

.page-about .about-corrections__note {
  margin: clamp(28px, 4vw, 40px) 0 0;
  max-width: 66ch;
  color: var(--fg-muted);
  font-size: 15px;
  line-height: 1.72;
}

/* 边界声明 */
.page-about .about-boundary {
  position: relative;
  overflow: hidden;
}

.page-about .about-boundary__inner {
  max-width: 74ch;
}

.page-about .about-boundary__list {
  list-style: none;
  margin: clamp(24px, 3vw, 36px) 0 0;
  padding: 0;
  display: grid;
  gap: 18px;
}

.page-about .about-boundary__list li {
  display: flex;
  gap: 14px;
  align-items: flex-start;
  color: var(--fg-muted);
  font-size: 15px;
  line-height: 1.72;
}

.page-about .about-boundary__list li::before {
  content: "";
  flex: 0 0 auto;
  width: 8px;
  height: 8px;
  margin-top: 9px;
  border-radius: 50%;
  background: var(--nebula);
}

.page-about .about-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: clamp(30px, 4vw, 44px);
}

/* 响应式 */
@media (min-width: 560px) {
  .page-about .about-versions li {
    grid-template-columns: 56px minmax(0, 1fr);
    align-items: baseline;
  }
}

@media (min-width: 760px) {
  .page-about .about-roles__row {
    grid-template-columns: 96px 200px minmax(0, 1fr);
    align-items: baseline;
  }

  .page-about .about-flow__steps {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: clamp(18px, 2.4vw, 34px);
  }
}

@media (min-width: 880px) {
  .page-about .about-ledger__row {
    grid-template-columns: 128px minmax(0, 1fr) 116px;
    align-items: baseline;
  }

  .page-about .about-ledger__num {
    text-align: right;
  }
}

@media (min-width: 900px) {
  .page-about .about-chapter {
    grid-template-columns: minmax(0, 3fr) minmax(0, 9fr);
    gap: 0 clamp(24px, 4vw, 56px);
    align-items: start;
  }

  .page-about .about-sources__grid {
    grid-template-columns: minmax(0, 6fr) minmax(0, 5fr);
  }

  .page-about .about-hero {
    padding-block: clamp(72px, 9vw, 148px) clamp(72px, 9vw, 132px);
  }
}

@media (min-width: 960px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 3fr);
    align-items: end;
    gap: clamp(40px, 6vw, 96px);
  }
}

@media (min-width: 1020px) {
  .page-about .about-flow__grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 3fr);
    align-items: start;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about *,
  .page-about *::before,
  .page-about *::after {
    transition-duration: 0.01ms !important;
    animation-duration: 0.01ms !important;
  }
}