.page-about {
  position: relative;
  overflow-x: clip;
  background: var(--ink);
  color: var(--text);
  font-family: var(--font-cn);
  line-height: 1.8;
}

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

/* ---------- 首屏 ---------- */
.page-about .about-lede {
  position: relative;
  padding: clamp(1.75rem, 5.5vw, 4rem) 0 clamp(1.25rem, 3.5vw, 2.25rem);
  background:
    radial-gradient(820px 380px at 82% -8%, rgba(123, 92, 255, 0.3), transparent 68%),
    radial-gradient(560px 320px at 5% 4%, rgba(242, 183, 74, 0.12), transparent 72%);
}

.page-about .about-lede__tag {
  margin: clamp(1rem, 3vw, 1.75rem) 0 0.7rem;
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.22em;
  color: var(--data);
  text-transform: uppercase;
}

.page-about .about-lede__title {
  margin: 0;
  max-width: 24ch;
  font-size: clamp(1.85rem, 6vw, 3.35rem);
  font-weight: 900;
  line-height: 1.2;
  letter-spacing: -0.01em;
  color: var(--ice);
}

.page-about .about-lede__title .hl {
  color: var(--gold);
}

.page-about .about-lede__lead {
  margin: clamp(1rem, 2.6vw, 1.5rem) 0 0;
  max-width: 62ch;
  font-size: clamp(0.95rem, 1.9vw, 1.08rem);
  line-height: 1.9;
  color: var(--text);
}

.page-about .about-stats {
  list-style: none;
  margin: clamp(1.75rem, 4vw, 2.75rem) 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--rule);
  border: 1px solid var(--rule);
}

.page-about .about-stats__item {
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
  padding: 1.05rem clamp(0.85rem, 2vw, 1.35rem);
  background: linear-gradient(180deg, rgba(13, 21, 48, 0.96), rgba(6, 10, 27, 0.99));
}

.page-about .about-stats__num {
  font-family: var(--font-mono);
  font-size: clamp(1.3rem, 3.4vw, 1.8rem);
  font-weight: 700;
  line-height: 1.1;
  letter-spacing: 0.01em;
  color: var(--gold);
}

.page-about .about-stats__label {
  font-size: 0.8rem;
  line-height: 1.6;
  letter-spacing: 0.03em;
  color: var(--muted);
}

/* ---------- 主体骨架 ---------- */
.page-about .about-shell {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(1.5rem, 4vw, 3rem);
  padding-bottom: clamp(3rem, 8vw, 5.5rem);
}

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

.page-about .about-rail {
  display: none;
}

.page-about .about-rail__cap {
  margin: 0 0 0.75rem;
  font-family: var(--font-mono);
  font-size: 0.68rem;
  letter-spacing: 0.22em;
  color: var(--muted);
}

.page-about .rail__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 0.1rem;
}

.page-about .rail__link {
  position: relative;
  display: block;
  padding: 0.34rem 0 0.34rem 0.7rem;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.05em;
  color: var(--muted);
  text-decoration: none;
  transition: color 0.18s var(--ease);
}

.page-about .rail__link::before {
  content: "";
  position: absolute;
  left: 0;
  top: 50%;
  width: 0;
  height: 1px;
  background: var(--gold);
  transform: translateY(-50%);
  transition: width 0.18s var(--ease);
}

.page-about .rail__link:hover,
.page-about .rail__link[data-active] {
  color: var(--gold);
}

.page-about .rail__link:hover::before,
.page-about .rail__link[data-active]::before {
  width: 0.42rem;
}

/* ---------- 章节 ---------- */
.page-about .about-block {
  position: relative;
  margin-top: clamp(2rem, 5vw, 3.25rem);
  padding-top: clamp(2rem, 5vw, 3.25rem);
  border-top: 1px solid var(--rule);
  scroll-margin-top: 140px;
}

.page-about .about-block:first-child {
  margin-top: 0;
  padding-top: 0;
  border-top: 0;
}

.page-about .about-block__head {
  max-width: 68ch;
  margin-bottom: clamp(1.4rem, 3.4vw, 2.25rem);
}

.page-about .about-block__idx {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.2em;
  color: var(--data);
  text-transform: uppercase;
}

.page-about .about-block__title {
  margin: 0.6rem 0 0.7rem;
  font-size: clamp(1.45rem, 3.6vw, 2.2rem);
  font-weight: 900;
  line-height: 1.25;
  letter-spacing: -0.01em;
  color: var(--ice);
}

.page-about .about-block__lead {
  margin: 0;
  font-size: clamp(0.94rem, 1.8vw, 1.04rem);
  line-height: 1.85;
  color: var(--muted);
}

.page-about .about-figure {
  margin: 0 0 clamp(1.4rem, 3vw, 2rem);
}

.page-about .grid > .about-figure {
  margin-bottom: 0;
}

/* ---------- 里程碑 ---------- */
.page-about .ml {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 1px;
  background: var(--rule);
  border-top: 1px solid var(--rule);
}

.page-about .ml__item {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 0.3rem;
  padding: clamp(1rem, 2.6vw, 1.4rem) 0;
  background: var(--ink);
}

.page-about .ml__year {
  font-family: var(--font-mono);
  font-size: 0.85rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  color: var(--gold);
}

.page-about .ml__title {
  margin: 0 0 0.35rem;
  font-size: 1rem;
  font-weight: 800;
  line-height: 1.5;
  color: var(--ice);
}

.page-about .ml__text {
  margin: 0;
  max-width: 64ch;
  font-size: 0.9rem;
  line-height: 1.85;
  color: var(--muted);
}

.page-about .note-panel {
  margin-top: clamp(1.25rem, 3vw, 1.75rem);
  padding: clamp(1rem, 2.8vw, 1.4rem);
  border: 1px solid var(--rule);
  border-left: 2px solid var(--violet);
  background: rgba(13, 21, 48, 0.62);
}

.page-about .note-panel__k {
  margin: 0 0 0.45rem;
  font-family: var(--font-mono);
  font-size: 0.68rem;
  letter-spacing: 0.18em;
  color: var(--data);
}

.page-about .note-panel__v {
  margin: 0;
  max-width: 66ch;
  font-size: 0.92rem;
  line-height: 1.85;
  color: var(--text);
}

/* ---------- 标签页 ---------- */
.page-about .about-tabs {
  margin-top: clamp(1.25rem, 3vw, 2rem);
}

.page-about .tabs__list {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  padding-bottom: 0.85rem;
  border-bottom: 1px solid var(--rule);
}

.page-about .tabs__tab {
  appearance: none;
  padding: 0.5rem 0.95rem;
  border: 1px solid var(--rule);
  border-radius: var(--radius);
  background: transparent;
  font-family: var(--font-cn);
  font-size: 0.86rem;
  color: var(--muted);
  cursor: pointer;
  transition: color 0.18s var(--ease), border-color 0.18s var(--ease), background 0.18s var(--ease);
}

.page-about .tabs__tab:hover {
  color: var(--ice);
  border-color: var(--violet);
}

.page-about .tabs__tab[aria-selected="true"] {
  color: var(--ink);
  background: var(--gold);
  border-color: var(--gold);
  font-weight: 700;
}

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

.page-about .about-tabs .tabs__panel {
  display: block;
  padding-top: 0.5rem;
}

.page-about .about-tabs[data-tabs-ready] .tabs__panel {
  display: none;
}

.page-about .about-tabs[data-tabs-ready] .tabs__panel[data-active] {
  display: block;
}

.page-about .about-tabs .tabs__panel + .tabs__panel {
  margin-top: 1.75rem;
}

/* ---------- 时间轴 ---------- */
.page-about .tl {
  list-style: none;
  margin: 1.5rem 0 0;
  padding: 0 0 0 1.5rem;
  border-left: 1px solid var(--rule);
}

.page-about .tl__item {
  position: relative;
  padding-bottom: 1.35rem;
}

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

.page-about .tl__item::before {
  content: "";
  position: absolute;
  left: -1.5rem;
  top: 0.6rem;
  width: 7px;
  height: 7px;
  margin-left: -4px;
  border-radius: 50%;
  background: var(--gold);
  box-shadow: 0 0 0 3px rgba(242, 183, 74, 0.14);
}

.page-about .tl__year {
  display: inline-block;
  margin-bottom: 0.28rem;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.14em;
  color: var(--data);
}

.page-about .tl__title {
  margin: 0 0 0.32rem;
  font-size: 0.98rem;
  font-weight: 800;
  line-height: 1.5;
  color: var(--ice);
}

.page-about .tl__text {
  margin: 0;
  max-width: 62ch;
  font-size: 0.89rem;
  line-height: 1.8;
  color: var(--muted);
}

/* ---------- 服务网络 ---------- */
.page-about .net {
  display: flex;
  flex-direction: column;
  gap: 1px;
  background: var(--rule);
  border: 1px solid var(--rule);
}

.page-about .net__row {
  padding: clamp(0.9rem, 2.4vw, 1.25rem);
  background: var(--layer);
}

.page-about .net__k {
  display: block;
  margin-bottom: 0.4rem;
  font-family: var(--font-mono);
  font-size: 0.71rem;
  letter-spacing: 0.12em;
  color: var(--gold);
}

.page-about .net__v {
  margin: 0;
  font-size: 0.89rem;
  line-height: 1.8;
  color: var(--text);
}

/* ---------- 资质 ---------- */
.page-about .cred-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1px;
  background: var(--rule);
  border: 1px solid var(--rule);
}

.page-about .cred {
  position: relative;
  overflow: hidden;
  padding: clamp(1.1rem, 3vw, 1.6rem);
  background: linear-gradient(160deg, rgba(13, 21, 48, 0.96), rgba(6, 10, 27, 0.99));
}

.page-about .cred::after {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  width: 2px;
  height: 100%;
  background: linear-gradient(180deg, var(--violet), var(--gold));
  transform: scaleY(0);
  transform-origin: top;
  transition: transform 0.3s var(--ease);
}

.page-about .cred:hover::after,
.page-about .cred:focus-within::after {
  transform: scaleY(1);
}

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

.page-about .cred__idx {
  display: block;
  font-family: var(--font-mono);
  font-size: 0.67rem;
  letter-spacing: 0.16em;
  color: var(--muted);
}

.page-about .cred__name {
  margin: 0.5rem 0 0.5rem;
  font-size: 1rem;
  font-weight: 800;
  line-height: 1.45;
  color: var(--ice);
}

.page-about .cred__desc {
  margin: 0;
  font-size: 0.87rem;
  line-height: 1.8;
  color: var(--muted);
  transition: color 0.3s var(--ease);
}

.page-about .cred:hover .cred__desc,
.page-about .cred:focus-within .cred__desc {
  color: var(--text);
}

/* ---------- 合作生态 ---------- */
.page-about .eco {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1px;
  background: var(--rule);
  border: 1px solid var(--rule);
}

.page-about .eco__item {
  padding: clamp(1.1rem, 3vw, 1.6rem);
  background: var(--layer);
}

.page-about .eco__title {
  margin: 0 0 0.55rem;
  font-size: 1rem;
  font-weight: 800;
  line-height: 1.5;
  color: var(--ice);
}

.page-about .eco__text {
  margin: 0;
  font-size: 0.89rem;
  line-height: 1.8;
  color: var(--muted);
}

.page-about .about-cta {
  display: grid;
  gap: 1.25rem;
  margin-top: clamp(1.6rem, 4vw, 2.5rem);
  padding: clamp(1.2rem, 3.4vw, 2rem);
  border: 1px solid var(--rule);
  border-left: 2px solid var(--gold);
  background: linear-gradient(120deg, rgba(123, 92, 255, 0.14), rgba(6, 10, 27, 0.25) 62%);
}

.page-about .about-cta__text {
  margin: 0;
  font-size: 0.94rem;
  line-height: 1.85;
  color: var(--text);
}

.page-about .about-cta__links {
  display: flex;
  flex-wrap: wrap;
  gap: 0.6rem;
}

/* ---------- 响应式 ---------- */
@media (min-width: 700px) {
  .page-about .about-stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

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

  .page-about .cred__desc {
    max-height: 3.6em;
    overflow: hidden;
    transition: max-height 0.32s var(--ease), color 0.3s var(--ease);
  }

  .page-about .cred:hover .cred__desc,
  .page-about .cred:focus-within .cred__desc {
    max-height: 12em;
  }

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

  .page-about .ml__item {
    grid-template-columns: 92px minmax(0, 1fr);
    gap: 0 1.5rem;
  }

  .page-about .ml__year {
    padding-top: 0.15rem;
  }
}

@media (min-width: 900px) {
  .page-about .about-cta {
    grid-template-columns: minmax(0, 1.5fr) minmax(0, 1fr);
    align-items: center;
  }

  .page-about .about-cta__links {
    flex-direction: column;
    align-items: stretch;
    gap: 0.5rem;
  }
}

@media (min-width: 1024px) {
  .page-about .about-shell {
    grid-template-columns: 156px minmax(0, 1fr);
    align-items: start;
  }

  .page-about .about-rail {
    display: block;
    position: sticky;
    top: 132px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .rail__link,
  .page-about .rail__link::before,
  .page-about .tabs__tab,
  .page-about .tl__item::before,
  .page-about .cred::after,
  .page-about .cred__desc {
    transition: none;
  }
}