.page-about {
  --ab-era-col: 172px;
  --ab-pad-y: clamp(44px, 7vw, 88px);
  position: relative;
}

/* ---------- 框景首屏 ---------- */
.page-about .ab-hero {
  position: relative;
  overflow: hidden;
  padding: clamp(40px, 7vw, 84px) 0 clamp(36px, 5vw, 64px);
  border-bottom: 1px solid var(--gx-line);
  background:
    radial-gradient(120% 90% at 88% 4%, rgba(91, 75, 255, 0.28), transparent 58%),
    radial-gradient(90% 70% at 0% 100%, rgba(160, 108, 255, 0.14), transparent 62%),
    var(--gx-void);
}

.page-about .ab-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background-image: repeating-linear-gradient(90deg, rgba(35, 42, 82, 0.55) 0 1px, transparent 1px 68px);
  opacity: 0.55;
}

.page-about .ab-hero__inner {
  position: relative;
  z-index: 1;
  max-width: 960px;
}

.page-about .ab-hero__title {
  margin: 14px 0 0;
  max-width: 18ch;
  font-family: var(--gx-font-display);
  font-weight: 300;
  font-size: clamp(38px, 7.2vw, 76px);
  line-height: 1.04;
  letter-spacing: -0.02em;
  color: var(--gx-paper);
}

.page-about .ab-hero__lead {
  max-width: 40ch;
  margin-top: 22px;
  color: var(--gx-silver);
}

.page-about .ab-hero__stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 18px 20px;
  margin-top: clamp(30px, 5vw, 52px);
  padding-top: 26px;
  border-top: 1px solid var(--gx-line);
}

.page-about .ab-hero__ticks {
  position: absolute;
  right: 0;
  top: 0;
  width: 46px;
  height: 100%;
  pointer-events: none;
  background-image: repeating-linear-gradient(180deg, var(--gx-line) 0 1px, transparent 1px 22px);
  opacity: 0.9;
}

/* ---------- 章节通用微调 ---------- */
.page-about .gx-section {
  padding-top: var(--ab-pad-y);
  padding-bottom: var(--ab-pad-y);
}

.page-about .ab-chronicle__note {
  max-width: 46ch;
  margin-top: 14px;
  color: var(--gx-mute);
  font-size: 15px;
  line-height: 1.75;
}

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

.page-about .ab-chronicle__media {
  margin: 32px 0 26px;
  border: 1px solid var(--gx-line);
}

/* ---------- 年份索引带 ---------- */
.page-about .ab-yearnav {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-bottom: 26px;
}

.page-about .ab-yearnav__item {
  display: inline-block;
  padding: 7px 14px;
  border: 1px solid var(--gx-line);
  border-radius: 999px;
  font-family: var(--gx-font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--gx-signal);
  text-decoration: none;
  transition: color 0.25s var(--gx-ease), border-color 0.25s var(--gx-ease), background-color 0.25s var(--gx-ease);
}

.page-about .ab-yearnav__item:hover,
.page-about .ab-yearnav__item:focus-visible {
  color: var(--gx-gold);
  border-color: var(--gx-gold);
  background: rgba(242, 178, 60, 0.08);
}

/* ---------- 星轨时间轴 ---------- */
.page-about .ab-timeline {
  list-style: none;
  margin: 0;
  padding: 0;
}

.page-about .ab-era {
  display: grid;
  gap: 10px;
  padding: 24px 0 28px;
  border-top: 1px solid var(--gx-line);
  scroll-margin-top: 120px;
}

.page-about .ab-era__year {
  font-family: var(--gx-font-mono);
  font-size: clamp(34px, 6.4vw, 58px);
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--gx-mute);
  transition: color 0.3s var(--gx-ease);
}

.page-about .ab-era:hover .ab-era__year {
  color: var(--gx-signal);
}

.page-about .ab-era:target .ab-era__year {
  color: var(--gx-gold);
}

.page-about .ab-era__title {
  margin: 0 0 8px;
  font-size: 19px;
  font-weight: 500;
  color: var(--gx-paper);
}

.page-about .ab-era__body p {
  max-width: 42ch;
  margin: 0;
  color: var(--gx-silver);
  font-size: 16px;
  line-height: 1.78;
}

/* ---------- 三处仓储 ---------- */
.page-about .ab-hubs {
  background: linear-gradient(180deg, rgba(11, 16, 36, 0.9), rgba(5, 6, 13, 0));
}

.page-about .ab-hubs__media {
  margin: 30px 0 34px;
  border: 1px solid var(--gx-line);
  max-width: 720px;
}

.page-about .ab-hubs__grid {
  display: grid;
  gap: 20px;
}

.page-about .ab-hub {
  position: relative;
  padding: 26px 22px 24px;
  border: 1px solid var(--gx-line);
  border-top: 3px solid var(--gx-brand);
  background: var(--gx-nebula);
}

.page-about .ab-hub--main {
  border-top-color: var(--gx-gold);
  background: linear-gradient(160deg, rgba(91, 75, 255, 0.22), var(--gx-nebula) 62%);
}

.page-about .ab-hub__code {
  margin: 0 0 10px;
  font-family: var(--gx-font-mono);
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--gx-mute);
}

.page-about .ab-hub__name {
  margin: 0 0 10px;
  font-size: clamp(24px, 4vw, 30px);
  font-weight: 400;
  letter-spacing: -0.01em;
  color: var(--gx-paper);
}

.page-about .ab-hub p:last-child {
  margin: 0;
  color: var(--gx-silver);
  font-size: 15px;
  line-height: 1.75;
}

/* ---------- 三级网点 ---------- */
.page-about .ab-tiers-sec {
  background: var(--gx-night);
  border-top: 1px solid var(--gx-line);
  border-bottom: 1px solid var(--gx-line);
}

.page-about .ab-tiers {
  display: grid;
  gap: 12px;
  margin-bottom: 34px;
}

.page-about .ab-tier {
  border: 1px solid var(--gx-line);
  background: var(--gx-void);
}

.page-about .ab-tier[data-open="true"] {
  border-color: rgba(91, 75, 255, 0.75);
}

.page-about .ab-tier__heading {
  margin: 0;
  font-size: inherit;
  font-weight: inherit;
}

.page-about .ab-tier__trigger {
  display: flex;
  align-items: center;
  gap: 12px;
  width: 100%;
  padding: 16px 18px;
  border: 0;
  background: transparent;
  color: var(--gx-paper);
  text-align: left;
  cursor: pointer;
  font-family: var(--gx-font-body);
  font-size: 16px;
}

.page-about .ab-tier__trigger:focus-visible {
  outline: 2px solid var(--gx-gold);
  outline-offset: -2px;
}

.page-about .ab-tier__dot {
  flex: 0 0 auto;
  border-radius: 50%;
  background: var(--gx-brand);
}

.page-about .ab-tier__dot--l1 {
  width: 16px;
  height: 16px;
  box-shadow: 0 0 0 4px rgba(91, 75, 255, 0.22);
}

.page-about .ab-tier__dot--l2 {
  width: 11px;
  height: 11px;
  background: var(--gx-violet);
  box-shadow: 0 0 0 4px rgba(160, 108, 255, 0.18);
}

.page-about .ab-tier__dot--l3 {
  width: 7px;
  height: 7px;
  background: var(--gx-signal);
  box-shadow: 0 0 0 4px rgba(138, 125, 255, 0.16);
}

.page-about .ab-tier__name {
  flex: 1 1 auto;
  color: var(--gx-paper);
}

.page-about .ab-tier .gx-panel__code {
  font-family: var(--gx-font-mono);
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--gx-mute);
}

.page-about .ab-tier .gx-panel__sign {
  font-family: var(--gx-font-mono);
  color: var(--gx-gold);
}

.page-about .ab-tier__body {
  padding: 0 18px 18px 46px;
  border-top: 1px solid var(--gx-line);
  padding-top: 16px;
}

.page-about .ab-tier__body p {
  max-width: 48ch;
  margin: 0 0 10px;
  color: var(--gx-silver);
  font-size: 15px;
  line-height: 1.75;
}

.page-about .ab-tier__meta {
  margin: 0;
  font-family: var(--gx-font-mono);
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--gx-mute);
}

/* ---------- 对照表 ---------- */
.page-about .ab-table__scroll {
  overflow-x: auto;
  border: 1px solid var(--gx-line);
  background: var(--gx-void);
}

.page-about .ab-table {
  width: 100%;
  min-width: 640px;
  border-collapse: collapse;
}

.page-about .ab-table__caption {
  padding: 14px 16px;
  text-align: left;
  font-family: var(--gx-font-mono);
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--gx-mute);
  border-bottom: 1px solid var(--gx-line);
}

.page-about .ab-table th,
.page-about .ab-table td {
  padding: 14px 16px;
  text-align: left;
  font-size: 14px;
  line-height: 1.6;
  border-bottom: 1px solid var(--gx-line);
  color: var(--gx-silver);
  vertical-align: top;
}

.page-about .ab-table thead th {
  font-family: var(--gx-font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--gx-paper);
  background: var(--gx-night);
}

.page-about .ab-table tbody th {
  color: var(--gx-paper);
  font-weight: 500;
}

.page-about .ab-table tbody tr:nth-child(even) {
  background: rgba(23, 28, 63, 0.45);
}

.page-about .ab-table tbody tr:hover,
.page-about .ab-table tbody tr:focus-within {
  background: rgba(91, 75, 255, 0.16);
}

.page-about .ab-code {
  font-family: var(--gx-font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--gx-signal);
}

/* ---------- 团队 ---------- */
.page-about .ab-team__grid {
  display: grid;
  gap: 28px;
}

.page-about .ab-team__copy .gx-section__head {
  margin-bottom: 14px;
}

.page-about .ab-team__media {
  margin: 0;
  border: 1px solid var(--gx-line);
}

.page-about .ab-roles {
  list-style: none;
  margin: 26px 0 0;
  padding: 0;
  display: grid;
  gap: 1px;
  background: var(--gx-line);
  border: 1px solid var(--gx-line);
}

.page-about .ab-role {
  display: grid;
  gap: 6px;
  padding: 16px 16px 18px;
  background: var(--gx-void);
}

.page-about .ab-role__code {
  font-family: var(--gx-font-mono);
  font-size: 11px;
  letter-spacing: 0.1em;
  color: var(--gx-mute);
}

.page-about .ab-role__name {
  font-size: 17px;
  color: var(--gx-paper);
}

.page-about .ab-role__text {
  color: var(--gx-silver);
  font-size: 14px;
  line-height: 1.7;
}

/* ---------- 标准与评定 ---------- */
.page-about .ab-quality {
  background: linear-gradient(180deg, rgba(23, 28, 63, 0.55), rgba(5, 6, 13, 0));
}

.page-about .ab-qcard {
  position: relative;
  padding: 26px 22px;
  border: 1px solid var(--gx-line);
  background: var(--gx-void);
}

.page-about .ab-qcard::after {
  content: "";
  position: absolute;
  left: 22px;
  top: 0;
  width: 34px;
  height: 3px;
  background: var(--gx-gold);
}

.page-about .ab-qcard__year {
  margin: 0 0 12px;
  font-family: var(--gx-font-mono);
  font-size: 13px;
  letter-spacing: 0.12em;
  color: var(--gx-gold);
}

.page-about .ab-qcard__title {
  margin: 0 0 10px;
  font-size: 19px;
  font-weight: 500;
  color: var(--gx-paper);
}

.page-about .ab-qcard p:last-child {
  margin: 0;
  color: var(--gx-silver);
  font-size: 15px;
  line-height: 1.75;
}

/* ---------- 协作生态与去向 ---------- */
.page-about .ab-eco__grid {
  display: grid;
  gap: 20px;
  padding: 26px;
  border: 1px solid var(--gx-line);
  background:
    linear-gradient(140deg, rgba(91, 75, 255, 0.16), transparent 60%),
    var(--gx-nebula);
}

.page-about .ab-eco__stat {
  display: flex;
  align-items: baseline;
  gap: 12px;
  padding-bottom: 14px;
  border-bottom: 1px solid var(--gx-line);
}

.page-about .ab-eco__num {
  font-family: var(--gx-font-mono);
  font-size: clamp(32px, 6vw, 48px);
  line-height: 1;
  color: var(--gx-gold);
}

.page-about .ab-eco__label {
  font-size: 14px;
  color: var(--gx-silver);
}

.page-about .ab-eco__text {
  margin: 0;
  max-width: 54ch;
  color: var(--gx-silver);
  font-size: 15px;
  line-height: 1.78;
}

.page-about .ab-next {
  margin-top: 34px;
  padding-top: 24px;
  border-top: 1px solid var(--gx-line);
}

.page-about .ab-next__lead {
  max-width: 48ch;
  margin: 0 0 18px;
  color: var(--gx-paper);
  font-size: 17px;
  line-height: 1.7;
}

.page-about .ab-next__actions {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 12px 20px;
}

.page-about .ab-next__link {
  font-size: 14px;
  color: var(--gx-signal);
  text-decoration: none;
  border-bottom: 1px solid rgba(138, 125, 255, 0.45);
  padding-bottom: 2px;
}

.page-about .ab-next__link:hover,
.page-about .ab-next__link:focus-visible {
  color: var(--gx-gold);
  border-bottom-color: var(--gx-gold);
}

/* ---------- 断点 ---------- */
@media (min-width: 760px) {
  .page-about .ab-hero__stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

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

  .page-about .ab-eco__grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    align-items: start;
  }

  .page-about .ab-eco__text {
    grid-column: 1 / -1;
  }
}

@media (min-width: 900px) {
  .page-about .ab-era {
    grid-template-columns: var(--ab-era-col) minmax(0, 1fr);
    gap: 42px;
    padding: 32px 0 40px;
  }

  .page-about .ab-hubs__grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    align-items: start;
  }

  .page-about .ab-hub:nth-child(2) {
    transform: translateY(30px);
  }

  .page-about .ab-hub:nth-child(3) {
    transform: translateY(14px);
  }

  .page-about .ab-hubs__grid {
    padding-bottom: 34px;
  }

  .page-about .ab-team__grid {
    grid-template-columns: minmax(0, 1.1fr) minmax(0, 0.9fr);
    gap: 44px;
    align-items: start;
  }

  .page-about .ab-roles {
    grid-template-columns: minmax(0, 1fr);
    margin-top: 30px;
  }

  .page-about .ab-tier__trigger {
    padding: 18px 22px;
  }

  .page-about .ab-tier__body {
    padding: 18px 22px 22px 56px;
  }
}

@media (min-width: 1100px) {
  .page-about .ab-era__year {
    position: sticky;
    top: 140px;
  }

  .page-about .ab-eco__grid {
    grid-template-columns: 1fr 1fr 1.4fr;
    align-items: center;
  }

  .page-about .ab-eco__text {
    grid-column: auto;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .ab-yearnav__item,
  .page-about .ab-era__year {
    transition: none;
  }

  .page-about .ab-hub:nth-child(2),
  .page-about .ab-hub:nth-child(3) {
    transform: none;
  }
}