.page-about {
  --about-hair: rgba(169, 183, 192, 0.2);
  --about-line: rgba(111, 143, 99, 0.55);
  display: block;
  overflow-x: clip;
  background: var(--abyss-950);
  color: var(--paper-100);
}

.page-about *,
.page-about *::before,
.page-about *::after {
  box-sizing: border-box;
}

.page-about .about-crumbs {
  padding-top: 26px;
  padding-bottom: 6px;
}

/* ---------- 首屏 ---------- */

.page-about .about-intro {
  position: relative;
  padding: 40px 0 56px;
}

.page-about .about-intro::before {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background:
    radial-gradient(680px 340px at 16% 0%, rgba(70, 224, 200, 0.14), transparent 70%),
    radial-gradient(520px 320px at 90% 18%, rgba(233, 180, 76, 0.08), transparent 72%);
}

.page-about .about-intro__grid {
  position: relative;
  align-items: start;
  row-gap: 34px;
}

.page-about .about-intro__title {
  margin: 16px 0 24px;
  font-weight: 300;
  font-size: clamp(40px, 8vw, 92px);
  line-height: 1.02;
  letter-spacing: -0.02em;
}

.page-about .about-intro__lede {
  max-width: 33em;
}

.page-about .about-intro__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 32px;
}

.page-about .about-factsheet {
  padding: 26px 24px 28px;
  border-radius: var(--r-card);
  border: 1px solid var(--line-neon);
  background: linear-gradient(165deg, rgba(18, 58, 85, 0.72), rgba(4, 18, 30, 0.6));
}

.page-about .about-factsheet__title {
  margin: 0 0 18px;
  font-size: 12px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--neon-200);
}

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

.page-about .about-factsheet__row {
  display: flex;
  flex-direction: column;
  gap: 3px;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--about-hair);
}

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

.page-about .about-factsheet__key {
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--stone-300);
}

.page-about .about-factsheet__val {
  font-size: 16px;
  line-height: 1.5;
  color: var(--paper-100);
  word-break: break-word;
}

.page-about .about-factsheet__val .mono {
  margin-right: 5px;
  font-size: 26px;
  color: var(--gold-400);
}

/* ---------- 横幅 ---------- */

.page-about .about-banner {
  padding-bottom: 8px;
}

.page-about .about-banner__figure {
  position: relative;
  margin: 0;
  border-radius: var(--r-media);
  overflow: hidden;
  border: 1px solid var(--line-neon);
  background: var(--abyss-800);
}

.page-about .about-banner__figure img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 16 / 7;
  object-fit: cover;
}

.page-about .about-banner__caption {
  position: absolute;
  left: 16px;
  bottom: 16px;
  padding: 6px 14px;
  border-radius: var(--r-pill);
  background: var(--glass-strong);
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--neon-200);
}

/* ---------- 区块头 ---------- */

.page-about .about-head {
  display: grid;
  gap: 20px;
  margin: 0;
}

.page-about .about-head__left {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.page-about .about-head__note {
  margin: 0;
  max-width: 30em;
}

.page-about .about-head__note a {
  color: var(--neon-400);
  text-decoration: underline;
  text-underline-offset: 3px;
}

.page-about .about-timeline,
.page-about .about-team,
.page-about .about-fit,
.page-about .about-credential {
  padding-top: 84px;
  padding-bottom: 84px;
}

.page-about .about-partners {
  padding-top: 72px;
  padding-bottom: 72px;
}

.page-about .about-next {
  padding-top: 56px;
  padding-bottom: 96px;
}

/* ---------- 时间线 ---------- */

.page-about .timeline {
  list-style: none;
  margin: 52px 0 0;
  padding: 0;
}

.page-about .timeline__item {
  position: relative;
  display: grid;
  grid-template-columns: 58px 1fr;
  gap: 14px;
  padding-bottom: 58px;
  border-radius: 10px;
}

.page-about .timeline__item:last-child {
  padding-bottom: 0;
}

.page-about .timeline__item:focus-visible {
  outline: 2px solid var(--neon-400);
  outline-offset: 10px;
}

.page-about .timeline__rail {
  position: relative;
  padding-left: 18px;
  min-height: 44px;
}

.page-about .timeline__rail::after {
  content: "";
  position: absolute;
  left: 5px;
  top: 46px;
  bottom: -48px;
  width: 1px;
  background: linear-gradient(180deg, var(--about-line), rgba(111, 143, 99, 0.06));
}

.page-about .timeline__item:last-child .timeline__rail::after {
  display: none;
}

.page-about .timeline__year {
  display: block;
  font-size: 14px;
  letter-spacing: 0.06em;
  color: var(--neon-200);
}

.page-about .timeline__dot {
  position: absolute;
  left: 0;
  top: 33px;
  width: 11px;
  height: 11px;
  border-radius: 50%;
  background: var(--moss-500);
  box-shadow: 0 0 0 4px rgba(111, 143, 99, 0.18);
}

.page-about .timeline__title {
  margin: 0 0 10px;
  color: var(--paper-100);
}

.page-about .timeline__text {
  margin: 0;
  max-width: 32em;
  color: var(--stone-300);
  line-height: 1.8;
}

.page-about .timeline__more {
  margin: 12px 0 0;
  max-width: 32em;
  padding-left: 14px;
  border-left: 2px solid var(--moss-500);
  font-size: 15px;
  line-height: 1.8;
  color: var(--neon-200);
}

/* ---------- 团队 ---------- */

.page-about .team-layout {
  margin-top: 46px;
  display: grid;
  gap: 32px;
}

.page-about .team-figure {
  margin: 0;
  border-radius: var(--r-media);
  overflow: hidden;
  border: 1px solid var(--line-neon);
  background: var(--abyss-800);
}

.page-about .team-figure img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 5 / 4;
  object-fit: cover;
}

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

.page-about .team-tabs .tabs__list {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.page-about .team-tabs .tabs__tab {
  appearance: none;
  font-family: inherit;
  font-size: 15px;
  line-height: 1.2;
  padding: 11px 20px;
  border-radius: var(--r-pill);
  border: 1px solid rgba(166, 245, 230, 0.22);
  background: transparent;
  color: var(--stone-300);
  cursor: pointer;
  transition: color var(--t-fast) var(--ease), background var(--t-fast) var(--ease),
    border-color var(--t-fast) var(--ease);
}

.page-about .team-tabs .tabs__tab:hover {
  border-color: var(--neon-400);
  color: var(--neon-200);
}

.page-about .team-tabs .tabs__tab[aria-selected="true"] {
  background: rgba(70, 224, 200, 0.14);
  border-color: var(--neon-400);
  color: var(--neon-200);
}

.page-about .team-tabs .tabs__tab:focus-visible {
  outline: 2px solid var(--neon-400);
  outline-offset: 3px;
}

.page-about .team-tabs .tabs__panel {
  padding: 26px 0 0;
}

.page-about .team-tabs .tabs__panel:focus-visible {
  outline: 2px solid var(--neon-400);
  outline-offset: 6px;
}

.page-about .team-tabs .tabs__panel h3 {
  margin: 0 0 12px;
}

.page-about .team-tabs .tabs__panel p {
  margin: 0;
  max-width: 34em;
  color: var(--stone-300);
  line-height: 1.8;
}

.page-about .tick-list {
  list-style: none;
  margin: 20px 0 0;
  padding: 0;
  display: grid;
  gap: 10px;
}

.page-about .tick-list li {
  position: relative;
  padding-left: 20px;
  font-size: 15px;
  line-height: 1.7;
  color: var(--paper-100);
}

.page-about .tick-list li::before {
  content: "";
  position: absolute;
  left: 2px;
  top: 9px;
  width: 8px;
  height: 8px;
  border-radius: 2px;
  background: var(--gold-400);
}

/* ---------- 适配清单 ---------- */

.page-about .fit-grid {
  margin-top: 44px;
  display: grid;
  gap: 16px;
}

.page-about .fit-card {
  padding: 26px 24px 28px;
  border-radius: var(--r-card);
  border: 1px solid rgba(166, 245, 230, 0.12);
  background: linear-gradient(160deg, rgba(18, 58, 85, 0.5), rgba(4, 18, 30, 0.36));
}

.page-about .fit-card--moss {
  border-color: rgba(111, 143, 99, 0.42);
  background: linear-gradient(160deg, rgba(111, 143, 99, 0.32), rgba(4, 18, 30, 0.44));
}

.page-about .fit-card--clay {
  border-color: rgba(180, 115, 90, 0.42);
  background: linear-gradient(160deg, rgba(180, 115, 90, 0.28), rgba(4, 18, 30, 0.44));
}

.page-about .fit-card__key {
  margin: 0 0 14px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--neon-200);
}

.page-about .fit-card__title {
  margin: 0 0 10px;
}

.page-about .fit-card p {
  margin: 0;
  max-width: 34em;
  color: var(--stone-300);
  line-height: 1.8;
}

.page-about .fit-card p a {
  color: var(--neon-400);
  text-decoration: underline;
  text-underline-offset: 3px;
}

/* ---------- 资质 ---------- */

.page-about .badge-row {
  margin-top: 46px;
  display: grid;
  gap: 18px;
}

.page-about .badge {
  display: flex;
  flex-direction: column;
  gap: 14px;
  padding: 30px 26px 32px;
  border-radius: var(--r-card);
  border: 1px solid rgba(166, 245, 230, 0.12);
  background: rgba(10, 33, 53, 0.6);
}

.page-about .badge__mark {
  width: 62px;
  height: 62px;
  color: var(--neon-400);
}

.page-about .badge__mark svg {
  display: block;
  width: 100%;
  height: 100%;
}

.page-about .badge:nth-child(2) .badge__mark {
  color: var(--gold-400);
}

.page-about .badge:nth-child(3) .badge__mark {
  color: var(--moss-500);
}

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

.page-about .badge__text {
  margin: 0;
  font-size: 15px;
  line-height: 1.8;
  color: var(--stone-300);
}

/* ---------- 合作生态 ---------- */

.page-about .partner-layout {
  margin-top: 46px;
  display: grid;
  gap: 32px;
}

.page-about .partner-list {
  display: grid;
}

.page-about .partner-item {
  padding: 24px 0 26px;
  border-top: 1px solid var(--about-hair);
}

.page-about .partner-item:last-child {
  border-bottom: 1px solid var(--about-hair);
}

.page-about .partner-item__count {
  margin: 0 0 8px;
  font-size: 14px;
  letter-spacing: 0.1em;
  color: var(--gold-400);
}

.page-about .partner-item__name {
  margin: 0 0 8px;
}

.page-about .partner-item p:last-child {
  margin: 0;
  max-width: 32em;
  color: var(--stone-300);
  line-height: 1.8;
}

.page-about .partner-figure {
  margin: 0;
  border-radius: var(--r-media);
  overflow: hidden;
  border: 1px solid var(--line-neon);
  background: var(--abyss-800);
}

.page-about .partner-figure img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 3 / 2;
  object-fit: cover;
}

/* ---------- 收尾 ---------- */

.page-about .about-next__panel {
  padding: 44px 28px;
  border-radius: var(--r-media);
  border: 1px solid rgba(233, 180, 76, 0.28);
  background:
    radial-gradient(560px 260px at 12% 0%, rgba(70, 224, 200, 0.16), transparent 70%),
    linear-gradient(150deg, rgba(18, 58, 85, 0.74), rgba(4, 18, 30, 0.84));
}

.page-about .about-next__panel h2 {
  margin: 10px 0 16px;
}

.page-about .about-next__panel .lede {
  margin: 0;
  max-width: 42em;
  word-break: break-word;
}

.page-about .about-next__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 30px;
}

/* ---------- 断点 ---------- */

@media (min-width: 780px) {
  .page-about .fit-grid {
    grid-template-columns: repeat(12, 1fr);
    gap: 18px;
  }

  .page-about .fit-card:nth-child(1) { grid-column: span 7; }
  .page-about .fit-card:nth-child(2) { grid-column: span 5; }
  .page-about .fit-card:nth-child(3) { grid-column: span 5; }
  .page-about .fit-card:nth-child(4) { grid-column: span 7; }
  .page-about .fit-card:nth-child(5) { grid-column: span 6; }
  .page-about .fit-card:nth-child(6) { grid-column: span 6; }

  .page-about .badge-row {
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
  }

  .page-about .about-next__panel {
    padding: 62px 54px;
  }
}

@media (min-width: 900px) {
  .page-about .about-head {
    grid-template-columns: 7fr 5fr;
    align-items: end;
    gap: 32px;
  }

  .page-about .about-intro__grid {
    row-gap: 0;
  }

  .page-about .timeline {
    margin-top: 60px;
  }

  .page-about .timeline__item {
    grid-template-columns: 96px 1fr;
    gap: 22px;
    padding-bottom: 76px;
  }

  .page-about .timeline__rail {
    padding-left: 22px;
  }

  .page-about .timeline__rail::after {
    left: 5px;
    top: 48px;
    bottom: -64px;
  }

  .page-about .timeline__year {
    font-size: 15px;
  }

  .page-about .timeline__more {
    max-height: 0;
    margin-top: 0;
    padding-left: 0;
    border-left-width: 0;
    opacity: 0;
    overflow: hidden;
    transition: max-height 320ms var(--ease), opacity var(--t-base) var(--ease),
      margin-top 320ms var(--ease), padding-left 320ms var(--ease),
      border-left-width 320ms var(--ease);
  }

  .page-about .timeline__item:hover .timeline__more,
  .page-about .timeline__item:focus .timeline__more,
  .page-about .timeline__item:focus-within .timeline__more {
    max-height: 220px;
    margin-top: 12px;
    padding-left: 14px;
    border-left-width: 2px;
    opacity: 1;
  }

  .page-about .team-layout {
    grid-template-columns: 5fr 7fr;
    gap: 42px;
    align-items: start;
  }

  .page-about .partner-layout {
    grid-template-columns: 6fr 6fr;
    gap: 46px;
    align-items: center;
  }

  .page-about .about-timeline,
  .page-about .about-team,
  .page-about .about-fit,
  .page-about .about-credential {
    padding-top: 104px;
    padding-bottom: 104px;
  }
}

@media (min-width: 1180px) {
  .page-about .about-factsheet {
    padding: 32px 30px 34px;
  }

  .page-about .fit-card {
    padding: 32px 30px 34px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .timeline__more,
  .page-about .team-tabs .tabs__tab,
  .page-about .timeline__body {
    transition: none !important;
  }
}