.page-about {
  --about-axis: 140px;
  --about-glow: radial-gradient(120% 100% at 0% 0%, rgba(224, 162, 60, .16), transparent 58%);
  --about-glow-2: radial-gradient(90% 80% at 100% 100%, rgba(61, 180, 155, .13), transparent 62%);
  background: var(--ink-900);
  color: var(--mist);
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.75;
  overflow-x: hidden;
}

.page-about .section {
  padding-block: clamp(3rem, 7vw, 6.5rem);
}

.page-about .section-title {
  font-family: var(--font-head);
  font-weight: 700;
  letter-spacing: -.01em;
  font-size: clamp(1.6rem, 4.4vw, 2.5rem);
  line-height: 1.16;
  color: var(--mist);
  margin: .5rem 0 .9rem;
  max-width: 22ch;
}

.page-about .lede {
  max-width: 62ch;
  color: var(--stone);
  font-size: 1rem;
  line-height: 1.8;
}

.page-about a {
  color: var(--amber);
  text-decoration: none;
  border-bottom: 1px solid rgba(224, 162, 60, .35);
  transition: border-color .18s var(--ease), color .18s var(--ease);
}

.page-about a:hover,
.page-about a:focus-visible {
  color: var(--amber-soft);
  border-bottom-color: var(--amber-soft);
}

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

/* ---------- 面包屑 ---------- */
.page-about .crumbs {
  padding-top: calc(var(--nav-h) + 1.25rem);
}

.page-about .crumbs__list {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: .45rem;
  list-style: none;
  margin: 0;
  padding: 0;
  font-size: .82rem;
  color: var(--stone);
}

.page-about .crumbs__item + .crumbs__item::before {
  content: "/";
  margin-right: .45rem;
  color: var(--metal);
}

.page-about .crumbs__item a {
  border-bottom-color: transparent;
  color: var(--stone);
}

.page-about .crumbs__item a:hover {
  color: var(--amber-soft);
}

.page-about .crumbs__item[aria-current="page"] {
  color: var(--amber);
}

/* ---------- 首屏框景 ---------- */
.page-about .about-hero {
  position: relative;
  padding-bottom: clamp(2rem, 5vw, 3.5rem);
}

.page-about .about-hero__frame {
  position: relative;
  margin-top: clamp(1.5rem, 4vw, 2.75rem);
  padding: clamp(1.75rem, 5vw, 3.75rem);
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  background: var(--about-glow), var(--about-glow-2), linear-gradient(180deg, var(--ink-800), var(--ink-900));
  box-shadow: var(--shadow-panel);
  overflow: hidden;
}

.page-about .about-hero__corner {
  position: absolute;
  inset: 14px;
  border: 1px solid var(--line-soft);
  border-radius: calc(var(--radius-lg) - 8px);
  pointer-events: none;
}

.page-about .about-hero__corner::before,
.page-about .about-hero__corner::after {
  content: "";
  position: absolute;
  width: 26px;
  height: 26px;
  border: 1px solid var(--amber);
  opacity: .55;
}

.page-about .about-hero__corner::before {
  top: -1px;
  left: -1px;
  border-right: 0;
  border-bottom: 0;
}

.page-about .about-hero__corner::after {
  right: -1px;
  bottom: -1px;
  border-left: 0;
  border-top: 0;
}

.page-about .about-hero__title {
  position: relative;
  font-family: var(--font-head);
  font-weight: 700;
  letter-spacing: -.015em;
  font-size: clamp(2rem, 7.2vw, 4.5rem);
  line-height: 1.05;
  color: var(--mist);
  margin: .6rem 0 1.25rem;
}

.page-about .about-hero__title br {
  display: none;
}

.page-about .about-hero__lede {
  position: relative;
  max-width: 60ch;
  color: var(--stone);
  font-size: clamp(1rem, 2.4vw, 1.06rem);
  line-height: 1.85;
}

.page-about .about-hero__facts {
  position: relative;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin: clamp(1.75rem, 4vw, 2.75rem) 0 0;
  background: var(--line-soft);
  border: 1px solid var(--line-soft);
  border-radius: var(--radius-md);
  overflow: hidden;
}

.page-about .about-hero__fact {
  background: var(--ink-800);
  padding: 1rem 1.1rem;
}

.page-about .about-hero__fact-label {
  font-size: .76rem;
  letter-spacing: .06em;
  color: var(--stone);
  margin: 0 0 .35rem;
}

.page-about .about-hero__fact-num {
  margin: 0;
  font-size: clamp(1.4rem, 4.6vw, 1.9rem);
  font-weight: 500;
  color: var(--amber);
  line-height: 1.1;
}

/* ---------- 起点 ---------- */
.page-about .about-start__grid {
  display: grid;
  gap: 1.75rem;
  margin-top: 1.5rem;
}

.page-about .about-start__lead p {
  color: var(--stone);
  margin: 0 0 1.1rem;
}

.page-about .about-start__note {
  align-self: start;
  padding: 1.4rem 1.5rem;
  border: 1px solid var(--line-soft);
  border-left: 2px solid var(--cinnabar);
  border-radius: var(--radius-md);
  background: linear-gradient(160deg, rgba(204, 66, 49, .1), transparent 70%), var(--ink-800);
}

.page-about .about-start__note-title {
  font-family: var(--font-head);
  font-size: 1rem;
  font-weight: 700;
  color: var(--mist);
  margin: 0 0 .9rem;
}

.page-about .about-start__note-list {
  list-style: none;
  margin: 0 0 1rem;
  padding: 0;
}

.page-about .about-start__note-list li {
  position: relative;
  padding-left: 1.1rem;
  margin-bottom: .6rem;
  font-size: .92rem;
  color: var(--mist);
}

.page-about .about-start__note-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: .72em;
  width: 6px;
  height: 1px;
  background: var(--cinnabar-text);
}

.page-about .about-start__note-foot {
  margin: 0;
  font-size: .84rem;
  color: var(--stone);
  padding-top: .9rem;
  border-top: 1px solid var(--line-soft);
}

/* ---------- 分区标准 ---------- */
.page-about .about-standard__grid {
  display: grid;
  gap: 2rem;
  margin-top: 1.75rem;
}

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

.page-about .about-standard__aside {
  min-width: 0;
  display: grid;
  gap: 1.25rem;
}

.page-about .about-standard__figure figcaption {
  margin-top: .7rem;
  font-size: .82rem;
  color: var(--stone);
}

.page-about .about-standard__foot {
  color: var(--stone);
  font-size: .95rem;
  padding-left: 1rem;
  border-left: 2px solid var(--amber);
  margin: 0;
}

/* ---------- 时间线 ---------- */
.page-about .about-timeline {
  list-style: none;
  margin: 1.75rem 0 0;
  padding: 0;
  border-top: 1px solid var(--line-soft);
}

.page-about .about-timeline__item {
  position: relative;
  display: grid;
  gap: .4rem;
  padding: 1.4rem 0 1.4rem 1.9rem;
  border-bottom: 1px solid var(--line-soft);
}

.page-about .about-timeline__item::before {
  content: "";
  position: absolute;
  left: 0;
  top: 1.85rem;
  width: 11px;
  height: 11px;
  border-radius: 50%;
  background: var(--ink-900);
  border: 2px solid var(--jade);
  transition: background .2s var(--ease), border-color .2s var(--ease);
}

.page-about .about-timeline__item:hover::before,
.page-about .about-timeline__item:focus-within::before {
  background: var(--jade);
  border-color: var(--amber-soft);
}

.page-about .about-timeline__year {
  font-size: .9rem;
  font-weight: 500;
  letter-spacing: .04em;
  color: var(--amber);
}

.page-about .about-timeline__title {
  font-family: var(--font-head);
  font-size: 1.12rem;
  font-weight: 700;
  color: var(--mist);
  margin: 0 0 .45rem;
}

.page-about .about-timeline__body p {
  color: var(--stone);
  margin: 0;
  font-size: .95rem;
}

.page-about .about-timeline__more {
  max-height: 0;
  overflow: hidden;
  opacity: 0;
  margin-top: 0 !important;
  font-size: .87rem !important;
  color: var(--metal) !important;
  transition: max-height .36s var(--ease), opacity .28s var(--ease), margin-top .28s var(--ease);
}

.page-about .about-timeline__item:hover .about-timeline__more,
.page-about .about-timeline__item:focus-within .about-timeline__more {
  max-height: 14rem;
  opacity: 1;
  margin-top: .6rem !important;
}

.page-about .about-milestones__figure {
  margin: 2rem 0 0;
}

.page-about .about-milestones__figure figcaption {
  margin-top: .7rem;
  font-size: .82rem;
  color: var(--stone);
}

/* ---------- 团队 ---------- */
.page-about .about-team__layout {
  display: grid;
  gap: 2rem;
  margin-top: 1.75rem;
}

.page-about .about-team__visual {
  display: grid;
  gap: 1.5rem;
  align-content: start;
}

.page-about .about-team__ring {
  position: relative;
  width: min(100%, 300px);
  aspect-ratio: 1;
  margin-inline: auto;
  border-radius: 50%;
  background: conic-gradient(
    from -90deg,
    var(--amber) 0deg 102deg,
    var(--jade) 102deg 200deg,
    var(--cinnabar) 200deg 290deg,
    var(--metal) 290deg 360deg
  );
  box-shadow: 0 0 0 1px var(--line-soft), 0 20px 46px rgba(3, 10, 19, .5);
}

.page-about .about-team__ring::after {
  content: "";
  position: absolute;
  inset: 21%;
  border-radius: 50%;
  background: var(--ink-800);
  border: 1px solid var(--line-soft);
}

.page-about .about-team__hub {
  position: absolute;
  inset: 0;
  display: grid;
  place-content: center;
  text-align: center;
  z-index: 1;
}

.page-about .about-team__hub-num {
  display: block;
  font-size: clamp(1.6rem, 6vw, 2.1rem);
  font-weight: 500;
  color: var(--mist);
  line-height: 1.1;
}

.page-about .about-team__hub-label {
  display: block;
  margin-top: .25rem;
  font-size: .78rem;
  letter-spacing: .08em;
  color: var(--stone);
}

.page-about .about-team__figure figcaption {
  margin-top: .7rem;
  font-size: .82rem;
  color: var(--stone);
}

.page-about .about-team__legend {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 1px;
  background: var(--line-soft);
  border: 1px solid var(--line-soft);
  border-radius: var(--radius-md);
  overflow: hidden;
}

.page-about .about-team__item {
  background: var(--ink-800);
  padding: 1.25rem 1.35rem 1.25rem 1.55rem;
  position: relative;
}

.page-about .about-team__item::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 3px;
}

.page-about .about-team__item--amber::before { background: var(--amber); }
.page-about .about-team__item--jade::before { background: var(--jade); }
.page-about .about-team__item--cinnabar::before { background: var(--cinnabar); }
.page-about .about-team__item--stone::before { background: var(--metal); }

.page-about .about-team__name {
  font-family: var(--font-head);
  font-size: 1.02rem;
  font-weight: 700;
  color: var(--mist);
  margin: 0 0 .45rem;
}

.page-about .about-team__item p {
  margin: 0;
  font-size: .92rem;
  color: var(--stone);
}

/* ---------- 维护节奏 ---------- */
.page-about .about-cadence__grid {
  display: grid;
  gap: 1rem;
  margin-top: 1.5rem;
}

.page-about .about-cadence__card {
  background: var(--ink-800);
  border: 1px solid var(--line-soft);
  border-radius: var(--radius-md);
  padding: 1.35rem 1.4rem;
  transition: border-color .18s var(--ease), transform .18s var(--ease);
}

.page-about .about-cadence__card:hover {
  border-color: rgba(224, 162, 60, .55);
  transform: translateY(-2px);
}

.page-about .about-cadence__card .chip {
  display: inline-block;
  margin: 0 0 .85rem;
  font-size: .74rem;
  letter-spacing: .08em;
  padding: .22rem .6rem;
  border-radius: 999px;
  border: 1px solid currentColor;
}

.page-about .about-cadence__card .chip--amber { color: var(--amber); }
.page-about .about-cadence__card .chip--jade { color: var(--jade); }
.page-about .about-cadence__card .chip--cinnabar { color: var(--cinnabar-text); }

.page-about .about-cadence__card .card__title {
  font-family: var(--font-head);
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--mist);
  margin: 0 0 .5rem;
}

.page-about .about-cadence__card p:last-child {
  margin: 0;
  font-size: .92rem;
  color: var(--stone);
}

/* ---------- 合作 ---------- */
.page-about .about-split {
  display: grid;
  gap: 2rem;
}

.page-about .about-split__text p {
  color: var(--stone);
  max-width: 62ch;
}

.page-about .about-partners__list {
  list-style: none;
  margin: 1.5rem 0 0;
  padding: 0;
  display: grid;
  gap: 1px;
  background: var(--line-soft);
  border-top: 1px solid var(--line-soft);
  border-bottom: 1px solid var(--line-soft);
}

.page-about .about-partners__item {
  background: var(--ink-900);
  padding: 1.15rem 0;
}

.page-about .about-partners__item h3 {
  font-family: var(--font-head);
  font-size: 1rem;
  font-weight: 700;
  color: var(--jade);
  margin: 0 0 .35rem;
}

.page-about .about-partners__item p {
  margin: 0;
  font-size: .92rem;
  color: var(--stone);
}

.page-about .about-quote {
  padding: 1.75rem 1.6rem;
  border-radius: var(--radius-lg);
  border: 1px solid var(--line);
  background: var(--about-glow-2), linear-gradient(180deg, var(--ink-800), var(--ink-900));
}

.page-about .about-quote__num {
  margin: 0;
  font-size: clamp(2.6rem, 10vw, 3.6rem);
  font-weight: 500;
  color: var(--amber);
  line-height: 1;
}

.page-about .about-quote__text {
  margin: .9rem 0 0;
  font-size: .92rem;
  color: var(--stone);
  line-height: 1.75;
}

/* ---------- 对外发布 ---------- */
.page-about .about-release__grid {
  display: grid;
  gap: 1.25rem;
  margin-top: 1.5rem;
}

.page-about .about-release__col {
  padding: 1.4rem 0 1.4rem 1.25rem;
  border-left: 2px solid var(--line);
  transition: border-color .2s var(--ease);
}

.page-about .about-release__col:hover {
  border-left-color: var(--amber);
}

.page-about .about-release__title {
  font-family: var(--font-head);
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--mist);
  margin: 0 0 .5rem;
}

.page-about .about-release__col p {
  margin: 0;
  font-size: .93rem;
  color: var(--stone);
}

.page-about .about-release__link {
  margin-top: 1rem !important;
}

.page-about .about-release__link .btn {
  display: inline-block;
  border-bottom: 0;
}

/* ---------- 到访与联系 ---------- */
.page-about .about-visit__panel {
  display: grid;
  gap: 1.75rem;
  padding: clamp(1.6rem, 5vw, 3rem);
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  background: var(--about-glow), linear-gradient(180deg, var(--ink-800), var(--ink-900));
  box-shadow: var(--shadow-panel);
}

.page-about .about-visit__intro p {
  color: var(--stone);
  max-width: 58ch;
  margin: 0;
}

.page-about .about-visit__rows {
  margin: 0;
  display: grid;
  gap: 1px;
  background: var(--line-soft);
  border: 1px solid var(--line-soft);
  border-radius: var(--radius-md);
  overflow: hidden;
}

.page-about .about-visit__row {
  background: var(--ink-900);
  padding: 1rem 1.15rem;
  display: grid;
  gap: .25rem;
}

.page-about .about-visit__label {
  font-size: .76rem;
  letter-spacing: .07em;
  color: var(--stone);
}

.page-about .about-visit__value {
  margin: 0;
  font-size: .98rem;
  color: var(--mist);
  font-weight: 500;
  word-break: break-word;
}

.page-about .about-visit__cta {
  display: flex;
  flex-wrap: wrap;
  gap: .75rem;
  margin: 0;
}

.page-about .about-visit__cta .btn {
  border-bottom: 0;
  font-weight: 500;
}

/* ---------- 按钮基础外观（复用共享类语义）---------- */
.page-about .btn {
  display: inline-block;
  padding: .7rem 1.35rem;
  border-radius: 999px;
  font-size: .92rem;
  letter-spacing: .02em;
  text-decoration: none;
  transition: transform .18s var(--ease), background-color .18s var(--ease), color .18s var(--ease), border-color .18s var(--ease);
}

.page-about .btn--amber {
  background: var(--amber);
  color: var(--ink-900);
  border: 1px solid var(--amber);
}

.page-about .btn--amber:hover,
.page-about .btn--amber:focus-visible {
  background: var(--amber-soft);
  border-color: var(--amber-soft);
  color: var(--ink-900);
}

.page-about .btn--jade {
  background: transparent;
  color: var(--jade);
  border: 1px solid rgba(61, 180, 155, .6);
}

.page-about .btn--jade:hover,
.page-about .btn--jade:focus-visible {
  background: rgba(61, 180, 155, .14);
  color: var(--mist);
}

.page-about .btn--ghost {
  background: transparent;
  color: var(--amber);
  border: 1px solid var(--line);
}

.page-about .btn--ghost:hover,
.page-about .btn--ghost:focus-visible {
  border-color: var(--amber);
  background: rgba(224, 162, 60, .1);
}

/* ---------- 媒体容器 ---------- */
.page-about .media {
  margin: 0;
}

.page-about .media__frame {
  overflow: hidden;
  border-radius: var(--radius-md);
  border: 1px solid var(--line-soft);
  background: var(--ink-800);
}

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

/* ---------- 响应式 ---------- */
@media (min-width: 640px) {
  .page-about .about-hero__facts {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

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

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

  .page-about .about-visit__row {
    grid-template-columns: 10rem minmax(0, 1fr);
    align-items: baseline;
    gap: 0 1.25rem;
  }
}

@media (min-width: 900px) {
  .page-about .about-hero__title br {
    display: inline;
  }

  .page-about .about-start__grid {
    grid-template-columns: minmax(0, 1.75fr) minmax(0, 1fr);
    gap: 2.75rem;
    align-items: start;
  }

  .page-about .about-standard__grid {
    grid-template-columns: minmax(0, 1.55fr) minmax(0, 1fr);
    gap: 2.5rem;
    align-items: start;
  }

  .page-about .about-timeline__item {
    grid-template-columns: var(--about-axis) minmax(0, 1fr);
    gap: 0 2.25rem;
    padding-left: 2.1rem;
    align-items: start;
  }

  .page-about .about-timeline__year {
    position: sticky;
    top: calc(var(--nav-h) + 1.5rem);
    padding-top: .22rem;
    font-size: 1rem;
  }

  .page-about .about-team__layout {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1.35fr);
    gap: 3rem;
    align-items: start;
  }

  .page-about .about-split {
    grid-template-columns: minmax(0, 1.6fr) minmax(0, 1fr);
    gap: 3rem;
    align-items: start;
  }

  .page-about .about-split__aside {
    position: sticky;
    top: calc(var(--nav-h) + 2rem);
  }

  .page-about .about-visit__panel {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1.1fr);
    gap: 2.5rem 3rem;
    align-items: start;
  }

  .page-about .about-visit__cta {
    grid-column: 2 / -1;
  }
}

@media (min-width: 1180px) {
  .page-about .about-cadence__grid {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .page-about .about-standard__grid {
    grid-template-columns: minmax(0, 1.7fr) minmax(0, 1fr);
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-cadence__card:hover {
    transform: none;
  }

  .page-about .about-timeline__more {
    transition: none;
  }
}