.page-about {
  --about-rail-w: 168px;
  background: var(--rb-void);
  color: var(--rb-ice);
}

.page-about a {
  color: inherit;
}

/* ===== Hero ===== */
.page-about .about-hero {
  position: relative;
  padding-block: clamp(1rem, 3vw, 2rem) clamp(2rem, 5vw, 4rem);
  background-image:
    linear-gradient(90deg, rgba(29, 44, 71, 0.55) 1px, transparent 1px),
    linear-gradient(rgba(29, 44, 71, 0.55) 1px, transparent 1px);
  background-size: 88px 88px;
  background-position: -1px -1px;
}

.page-about .rb-breadcrumb {
  margin-bottom: clamp(0.75rem, 2vw, 1.5rem);
  font-family: var(--rb-mono);
  font-size: 0.75rem;
  letter-spacing: 0.08em;
  color: var(--rb-steel);
}

.page-about .rb-breadcrumb a {
  color: var(--rb-steel);
  text-decoration: none;
}

.page-about .rb-breadcrumb a:hover,
.page-about .rb-breadcrumb a:focus-visible {
  color: var(--rb-cyan);
}

.page-about .about-hero__frame {
  position: relative;
  border: 1px solid var(--rb-line);
  background:
    linear-gradient(155deg, rgba(55, 230, 255, 0.09), rgba(139, 92, 255, 0.11) 52%, rgba(5, 7, 14, 0.9));
  padding: clamp(1.15rem, 4vw, 3.25rem);
}

.page-about .about-hero__frame::before {
  content: "";
  position: absolute;
  top: -1px;
  left: clamp(1.15rem, 4vw, 3.25rem);
  width: 96px;
  height: 3px;
  background: linear-gradient(90deg, var(--rb-cyan), var(--rb-violet));
}

.page-about .about-hero__frame::after {
  content: "";
  position: absolute;
  right: -1px;
  bottom: -1px;
  width: 26px;
  height: 26px;
  border-right: 2px solid var(--rb-lime);
  border-bottom: 2px solid var(--rb-lime);
}

.page-about .about-hero__meta {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.6rem 0.9rem;
  font-family: var(--rb-mono);
}

.page-about .about-hero__title {
  margin: 0.9rem 0 1rem;
  font-size: clamp(2rem, 7.2vw, 4.4rem);
  line-height: 1.04;
  font-weight: 800;
  letter-spacing: -0.02em;
}

.page-about .about-hero__title em {
  font-style: normal;
  color: var(--rb-cyan);
  text-shadow: 0 0 26px rgba(55, 230, 255, 0.35);
}

.page-about .about-hero__lede {
  max-width: 60ch;
  color: var(--rb-ice);
  opacity: 0.88;
}

.page-about .about-hero__stats {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
  gap: 1px;
  margin-top: clamp(1.25rem, 3vw, 2.25rem);
  background: var(--rb-line);
  border: 1px solid var(--rb-line);
}

.page-about .about-stat {
  display: flex;
  flex-direction: column;
  gap: 0.3rem;
  padding: 0.85rem 1rem;
  background: var(--rb-deck);
}

.page-about .about-stat__num {
  font-family: var(--rb-mono);
  font-size: clamp(1.5rem, 4vw, 2.1rem);
  font-weight: 700;
  color: var(--rb-lime);
  line-height: 1;
}

.page-about .about-stat__label {
  font-size: 0.8125rem;
  color: var(--rb-steel);
  letter-spacing: 0.04em;
}

/* ===== 主体骨架 ===== */
.page-about .about-body {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(1.5rem, 4vw, 3rem);
  padding-block: clamp(2rem, 5vw, 4rem) clamp(3rem, 6vw, 5rem);
}

.page-about .about-rail {
  min-width: 0;
  border-top: 1px solid var(--rb-line);
  padding-top: 0.85rem;
}

.page-about .about-rail__title {
  margin: 0 0 0.5rem;
  font-family: var(--rb-mono);
  font-size: 0.6875rem;
  letter-spacing: 0.24em;
  text-transform: uppercase;
  color: var(--rb-steel);
}

.page-about .about-rail__list {
  display: flex;
  gap: 0.4rem;
  margin: 0;
  padding: 0 0 0.5rem;
  list-style: none;
  overflow-x: auto;
}

.page-about .about-rail__link {
  display: block;
  padding: 0.35rem 0.6rem;
  border: 1px solid var(--rb-line);
  font-family: var(--rb-mono);
  font-size: 0.75rem;
  white-space: nowrap;
  color: var(--rb-steel);
  text-decoration: none;
  transition: color 0.2s var(--rb-ease), border-color 0.2s var(--rb-ease), background 0.2s var(--rb-ease);
}

.page-about .about-rail__link:hover,
.page-about .about-rail__link:focus-visible {
  color: var(--rb-ice);
  border-color: var(--rb-cyan-deep);
}

.page-about .about-rail__link[aria-current="true"] {
  color: var(--rb-void);
  background: var(--rb-cyan);
  border-color: var(--rb-cyan);
  font-weight: 700;
}

.page-about .about-flow {
  min-width: 0;
  display: flex;
  flex-direction: column;
  gap: clamp(1.75rem, 4vw, 3rem);
}

/* ===== 章节通用 ===== */
.page-about .about-sec {
  position: relative;
  border-top: 1px solid var(--rb-line);
  padding-top: clamp(1.25rem, 3vw, 2rem);
  scroll-margin-top: 6rem;
}

.page-about .about-sec__num {
  margin: 0 0 0.6rem;
  font-family: var(--rb-mono);
  font-size: 0.75rem;
  letter-spacing: 0.2em;
  color: var(--rb-cyan);
}

.page-about .about-sec__title {
  margin: 0 0 clamp(0.9rem, 2vw, 1.35rem);
  font-size: clamp(1.5rem, 3.6vw, 2.6rem);
  line-height: 1.12;
  font-weight: 700;
  letter-spacing: -0.01em;
  max-width: 26ch;
}

.page-about .about-sec__body p,
.page-about .about-team__main > p,
.page-about .about-eco__note {
  margin: 0 0 0.9rem;
  max-width: 68ch;
  font-size: 1rem;
  line-height: 1.8;
  color: var(--rb-ice);
  opacity: 0.86;
}

/* ===== KPI ===== */
.page-about .about-kpis {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
  gap: 1px;
  margin-top: 1.25rem;
  background: var(--rb-line);
  border: 1px solid var(--rb-line);
}

.page-about .about-kpi {
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
  padding: 1rem 1.1rem;
  background: var(--rb-deck);
}

.page-about .about-kpi .rb-kpi {
  font-family: var(--rb-mono);
  font-size: clamp(1.6rem, 4vw, 2.4rem);
  font-weight: 700;
  line-height: 1;
  color: var(--rb-cyan);
}

.page-about .about-kpi .rb-kpi__label {
  font-size: 0.8125rem;
  color: var(--rb-steel);
}

/* ===== 时间线 ===== */
.page-about .about-timeline {
  position: relative;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .about-timeline::before {
  content: "";
  position: absolute;
  top: 0.6rem;
  bottom: 0.6rem;
  left: 8px;
  width: 1px;
  background: linear-gradient(180deg, var(--rb-cyan), var(--rb-violet));
  opacity: 0.65;
}

.page-about .about-timeline__item {
  position: relative;
  padding: 0 0 1.6rem 2.25rem;
}

.page-about .about-timeline__item::before {
  content: "";
  position: absolute;
  left: 1px;
  top: 0.3rem;
  width: 13px;
  height: 13px;
  border: 1px solid var(--rb-cyan);
  background: var(--rb-void);
  transform: rotate(45deg);
}

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

.page-about .about-timeline__year {
  display: block;
  margin-bottom: 0.25rem;
  font-family: var(--rb-mono);
  font-size: 1rem;
  letter-spacing: 0.1em;
  color: var(--rb-lime);
}

.page-about .about-timeline__title {
  margin: 0 0 0.3rem;
  font-size: 1.0625rem;
  font-weight: 700;
  line-height: 1.4;
  color: var(--rb-ice);
}

.page-about .about-timeline__text {
  margin: 0;
  max-width: 62ch;
  font-size: 0.9375rem;
  line-height: 1.75;
  color: var(--rb-steel);
}

/* ===== 团队 ===== */
.page-about .about-team {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(1.25rem, 3vw, 2rem);
}

.page-about .about-team__main,
.page-about .about-team__aside {
  min-width: 0;
}

.page-about .about-team__aside {
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.page-about .about-media {
  margin: 0;
  border: 1px solid var(--rb-line);
  background: var(--rb-deck);
}

.page-about .about-media img {
  display: block;
  width: 100%;
  height: auto;
  max-width: 100%;
  object-fit: cover;
  filter: saturate(0.85) contrast(1.05);
}

.page-about .about-media .rb-media__caption {
  padding: 0.6rem 0.75rem;
  font-family: var(--rb-mono);
  font-size: 0.6875rem;
  line-height: 1.6;
  letter-spacing: 0.04em;
  color: var(--rb-steel);
  border-top: 1px solid var(--rb-line);
}

/* Tabs */
.page-about .about-tabs {
  margin-top: 1.1rem;
  border: 1px solid var(--rb-line);
  background: var(--rb-deck);
}

.page-about .about-tabs .rb-tabs__list {
  display: flex;
  flex-wrap: wrap;
  gap: 1px;
  background: var(--rb-line);
}

.page-about .about-tabs .rb-tabs__btn {
  flex: 1 1 auto;
  padding: 0.7rem 0.85rem;
  border: 0;
  border-radius: 0;
  background: var(--rb-void);
  color: var(--rb-steel);
  font-family: var(--rb-sans);
  font-size: 0.8125rem;
  letter-spacing: 0.03em;
  text-align: left;
  cursor: pointer;
  transition: color 0.2s var(--rb-ease), background 0.2s var(--rb-ease);
}

.page-about .about-tabs .rb-tabs__btn:hover {
  color: var(--rb-cyan);
}

.page-about .about-tabs .rb-tabs__btn:focus-visible {
  outline: 2px solid var(--rb-cyan);
  outline-offset: -2px;
}

.page-about .about-tabs .rb-tabs__btn[aria-selected="true"] {
  background: linear-gradient(120deg, rgba(55, 230, 255, 0.16), rgba(139, 92, 255, 0.2));
  color: var(--rb-cyan);
  box-shadow: inset 0 -2px 0 var(--rb-cyan);
}

.page-about .about-tabs .rb-tabs__panel {
  display: block;
  padding: 1rem 1.1rem 1.2rem;
}

.page-about .about-tabs .rb-tabs__panel[hidden] {
  display: none;
}

.page-about .about-tabs .rb-tabs__panel h3 {
  margin: 0 0 0.5rem;
  font-size: 1.0625rem;
  font-weight: 700;
  color: var(--rb-ice);
}

.page-about .about-tabs .rb-tabs__panel p {
  margin: 0;
  max-width: 62ch;
  font-size: 0.9375rem;
  line-height: 1.8;
  color: var(--rb-steel);
}

/* ===== 生态 ===== */
.page-about .about-eco {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(1.25rem, 3vw, 2rem);
  align-items: center;
}

.page-about .about-eco__figure {
  border: 1px solid var(--rb-line);
  background:
    radial-gradient(circle at 50% 50%, rgba(139, 92, 255, 0.16), transparent 68%),
    var(--rb-deck);
  padding: 0.75rem;
}

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

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

.page-about .about-node {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 0.15rem 0.9rem;
  padding: 0.85rem 0.25rem;
  border-bottom: 1px dashed var(--rb-line);
  transition: background 0.2s var(--rb-ease), padding-left 0.2s var(--rb-ease);
}

.page-about .about-node__label {
  font-size: 0.9375rem;
  font-weight: 600;
  color: var(--rb-ice);
}

.page-about .about-node__value {
  font-family: var(--rb-mono);
  font-size: 0.9375rem;
  color: var(--rb-lime);
  white-space: nowrap;
}

.page-about .about-node__tip {
  grid-column: 1 / -1;
  font-size: 0.8125rem;
  line-height: 1.7;
  color: var(--rb-steel);
  opacity: 0.62;
  transition: opacity 0.2s var(--rb-ease), color 0.2s var(--rb-ease);
}

.page-about .about-node:hover,
.page-about .about-node:focus-within,
.page-about .about-node:focus-visible {
  background: rgba(55, 230, 255, 0.06);
  padding-left: 0.6rem;
  outline: none;
}

.page-about .about-node:hover .about-node__tip,
.page-about .about-node:focus-within .about-node__tip,
.page-about .about-node:focus-visible .about-node__tip {
  opacity: 1;
  color: var(--rb-ice);
}

.page-about .about-node:focus-visible {
  box-shadow: inset 2px 0 0 var(--rb-cyan);
}

.page-about .about-media--band {
  margin-top: clamp(1.25rem, 3vw, 2rem);
}

.page-about .about-eco__note {
  margin-top: 1rem;
  padding-left: 0.9rem;
  border-left: 2px solid var(--rb-violet);
  font-size: 0.9375rem;
}

/* ===== 服务对象 ===== */
.page-about .about-use {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1px;
  background: var(--rb-line);
  border: 1px solid var(--rb-line);
}

.page-about .about-use__cell {
  display: flex;
  flex-direction: column;
  gap: 0.55rem;
  padding: clamp(1rem, 2.5vw, 1.6rem);
  background: var(--rb-deck);
  transition: background 0.2s var(--rb-ease);
}

.page-about .about-use__cell:hover {
  background: #0E1728;
}

.page-about .about-use__title {
  margin: 0;
  font-size: 1.0625rem;
  font-weight: 700;
  color: var(--rb-cyan);
  letter-spacing: 0.01em;
}

.page-about .about-use__cell p {
  margin: 0;
  flex: 1 1 auto;
  font-size: 0.9375rem;
  line-height: 1.8;
  color: var(--rb-steel);
}

.page-about .about-use__link {
  align-self: flex-start;
  font-family: var(--rb-mono);
  font-size: 0.8125rem;
  letter-spacing: 0.04em;
  color: var(--rb-ice);
  text-decoration: none;
  border-bottom: 1px solid var(--rb-cyan-deep);
  padding-bottom: 2px;
  transition: color 0.2s var(--rb-ease), border-color 0.2s var(--rb-ease);
}

.page-about .about-use__link:hover,
.page-about .about-use__link:focus-visible {
  color: var(--rb-cyan);
  border-color: var(--rb-cyan);
}

/* ===== CTA ===== */
.page-about .about-cta {
  border: 1px solid var(--rb-line);
  border-left: 3px solid var(--rb-cyan);
  background:
    linear-gradient(118deg, rgba(139, 92, 255, 0.16), rgba(55, 230, 255, 0.08) 62%, transparent);
  padding: clamp(1.25rem, 3.5vw, 2.5rem);
}

.page-about .about-cta .about-sec__title {
  max-width: 30ch;
}

.page-about .about-cta p {
  margin: 0 0 1.1rem;
  max-width: 64ch;
  font-size: 1rem;
  line-height: 1.8;
  color: var(--rb-ice);
  opacity: 0.88;
}

.page-about .about-cta__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
}

.page-about .about-cta__actions .rb-btn:focus-visible {
  outline: 2px solid var(--rb-lime);
  outline-offset: 2px;
}

/* ===== 响应式 ===== */
@media (min-width: 700px) {
  .page-about .about-use {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .page-about .about-timeline__item {
    display: grid;
    grid-template-columns: 84px minmax(0, 1fr);
    gap: 0 1.25rem;
    padding-left: 2.5rem;
  }

  .page-about .about-timeline__year {
    text-align: right;
    margin-bottom: 0;
  }
}

@media (min-width: 900px) {
  .page-about .about-body {
    grid-template-columns: var(--about-rail-w) minmax(0, 1fr);
    align-items: start;
  }

  .page-about .about-rail {
    position: sticky;
    top: 6rem;
    border-top: 0;
    border-left: 1px solid var(--rb-line);
    padding: 0 0 0 0.9rem;
  }

  .page-about .about-rail__list {
    flex-direction: column;
    overflow: visible;
    gap: 0.3rem;
    padding-bottom: 0;
  }

  .page-about .about-rail__link {
    border: 0;
    border-left: 2px solid transparent;
    padding: 0.3rem 0.5rem;
  }

  .page-about .about-rail__link[aria-current="true"] {
    background: transparent;
    color: var(--rb-cyan);
    border-color: var(--rb-cyan);
  }

  .page-about .about-team {
    grid-template-columns: minmax(0, 1.15fr) minmax(0, 0.85fr);
    align-items: start;
  }

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

@media (prefers-reduced-motion: reduce) {
  .page-about .about-rail__link,
  .page-about .about-node,
  .page-about .about-node__tip,
  .page-about .about-use__cell,
  .page-about .about-tabs .rb-tabs__btn,
  .page-about .about-use__link {
    transition: none;
  }
}