.page-about {
  --about-line: 3px solid var(--line-700);
  --about-card-shadow: 6px 6px 0 rgba(0, 0, 0, .45);
  display: block;
}

.page-about .breadcrumb {
  padding-top: calc(var(--header-h) + 18px);
  padding-inline: var(--gut);
  max-width: var(--shell-max);
  margin-inline: auto;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  overflow: hidden;
  background: var(--ink-900);
  padding-block: 28px 60px;
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background:
    repeating-linear-gradient(112deg, rgba(27, 36, 71, .55) 0 2px, transparent 2px 24px),
    radial-gradient(120% 80% at 84% 6%, rgba(123, 92, 255, .26), transparent 62%),
    radial-gradient(90% 70% at 4% 0%, rgba(34, 230, 210, .13), transparent 58%);
}

.page-about .about-hero__trace {
  display: none;
  position: absolute;
  right: -40px;
  bottom: 20px;
  width: 420px;
  height: 220px;
  opacity: .5;
  pointer-events: none;
}

.page-about .about-hero__trace-line {
  fill: none;
  stroke: var(--cyan);
  stroke-width: 3;
  stroke-linejoin: round;
}

.page-about .about-hero__trace-dot {
  fill: var(--orange);
}

.page-about .about-hero__grid {
  position: relative;
  z-index: 1;
  display: grid;
  gap: 34px;
  align-items: center;
}

.page-about .about-hero__title {
  margin: 14px 0 0;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(1.95rem, 6.2vw, 3.3rem);
  line-height: 1.1;
  letter-spacing: -0.02em;
  color: var(--paper);
}

.page-about .about-hero__title em {
  font-style: normal;
  color: var(--cyan);
}

.page-about .about-hero__lede {
  margin-top: 18px;
  color: var(--mist);
  font-size: 1rem;
  line-height: 1.8;
  max-width: 46ch;
}

.page-about .about-facts {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(96px, 1fr));
  gap: 16px;
  margin-top: 28px;
  padding-top: 22px;
  border-top: var(--about-line);
}

.page-about .about-fact {
  display: grid;
  gap: 6px;
}

.page-about .about-fact__num {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: 1.5rem;
  font-weight: 800;
  line-height: 1;
  color: var(--paper);
}

.page-about .about-fact__num::after {
  content: "";
  display: block;
  width: 26px;
  height: 3px;
  margin-top: 8px;
  background: var(--cyan);
}

.page-about .about-fact__label {
  font-size: .78rem;
  line-height: 1.5;
  color: var(--mist);
}

.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 30px;
}

.page-about .about-hero__media {
  margin: 0;
  border: var(--about-line);
  box-shadow: var(--shadow-hard);
  background: var(--ink-800);
}

.page-about .about-hero__media img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 16 / 10;
  object-fit: cover;
}

@media (min-width: 960px) {
  .page-about .about-hero {
    padding-block: 40px 84px;
  }
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 0.42fr) minmax(0, 0.58fr);
    gap: 52px;
  }
  .page-about .about-hero__trace {
    display: block;
  }
}

/* ---------- 历程分屏 ---------- */
.page-about .about-story__grid {
  display: grid;
  gap: 34px;
}

.page-about .about-index {
  display: grid;
  gap: 3px;
  margin-top: 12px;
}

.page-about .about-index__link {
  display: flex;
  align-items: baseline;
  gap: 12px;
  padding: 11px 14px;
  border-left: 3px solid var(--line-700);
  color: var(--mist);
  font-size: .86rem;
  text-decoration: none;
  transition: color .2s var(--ease), border-color .2s var(--ease), background-color .2s var(--ease);
}

.page-about .about-index__link:hover,
.page-about .about-index__link:focus-visible {
  color: var(--paper);
  border-left-color: var(--cyan);
  background: rgba(34, 230, 210, .08);
}

.page-about .about-index__num {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: .78rem;
  color: var(--cyan);
}

.page-about .about-quote {
  margin: 0 0 26px;
  padding: 6px 0 6px 20px;
  border-left: 4px solid var(--cyan);
}

.page-about .about-quote p {
  margin: 0;
  font-family: var(--font-display);
  font-size: 1.08rem;
  font-weight: 600;
  line-height: 1.7;
  color: var(--paper);
}

.page-about .about-story__prose p {
  margin: 0 0 18px;
  color: var(--mist);
  line-height: 1.85;
}

.page-about .timeline {
  list-style: none;
  margin: 30px 0 0;
  padding: 0;
  display: grid;
  gap: 14px;
  counter-reset: none;
}

.page-about .timeline__step {
  border: var(--about-line);
  background: var(--ink-800);
  box-shadow: var(--about-card-shadow);
  transition: border-color .24s var(--ease), transform .24s var(--ease);
}

.page-about .timeline__step:hover,
.page-about .timeline__step:focus-within {
  border-color: var(--cyan);
}

.page-about .timeline__heading {
  margin: 0;
  font-size: 1rem;
}

.page-about .timeline__head {
  display: grid;
  grid-template-columns: auto 1fr auto;
  align-items: center;
  gap: 12px;
  width: 100%;
  padding: 16px 18px;
  border: 0;
  background: none;
  color: var(--paper);
  text-align: left;
  font-family: var(--font-display);
  cursor: pointer;
}

.page-about .timeline__head:focus-visible {
  outline: 3px solid var(--cyan);
  outline-offset: -3px;
}

.page-about .timeline__num {
  font-size: .8rem;
  color: var(--violet);
}

.page-about .timeline__title {
  font-size: 1rem;
  font-weight: 800;
  line-height: 1.4;
}

.page-about .timeline__meta {
  display: none;
  font-size: .74rem;
  color: var(--mist);
}

.page-about .timeline__step:nth-child(odd) .timeline__num {
  color: var(--cyan);
}

.page-about .timeline__panel {
  padding: 0 18px 18px;
  color: var(--mist);
  font-size: .93rem;
  line-height: 1.8;
  max-height: none;
  overflow: visible;
}

.page-about .timeline__panel[hidden] {
  display: none;
}

.page-about .timeline__panel p {
  margin: 0;
}

.page-about .about-story__banner {
  margin: 32px 0 0;
  border: var(--about-line);
  background: var(--ink-800);
}

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

@media (min-width: 640px) {
  .page-about .timeline__meta {
    display: inline;
  }
}

@media (min-width: 900px) {
  .page-about .timeline__step:nth-child(1) { margin-left: 0; }
  .page-about .timeline__step:nth-child(2) { margin-left: 26px; }
  .page-about .timeline__step:nth-child(3) { margin-left: 52px; }
  .page-about .timeline__step:nth-child(4) { margin-left: 78px; }
  .page-about .timeline__step:nth-child(5) { margin-left: 104px; }
}

@media (min-width: 1024px) {
  .page-about .about-story__grid {
    grid-template-columns: minmax(0, 0.34fr) minmax(0, 0.66fr);
    gap: 56px;
    align-items: start;
  }
  .page-about .about-story__aside {
    position: sticky;
    top: calc(var(--header-h) + 28px);
  }
}

/* ---------- 团队 ---------- */
.page-about .about-team__grid {
  display: grid;
  gap: 32px;
}

.page-about .about-team__media {
  margin: 0;
  border: var(--about-line);
  box-shadow: var(--about-card-shadow);
  background: var(--ink-900);
}

.page-about .about-team__media img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 14 / 9;
  object-fit: cover;
}

.page-about .about-team__body p {
  margin: 0 0 18px;
  color: var(--mist);
  line-height: 1.85;
}

.page-about .about-team__body p:last-child {
  margin-bottom: 0;
}

.page-about .about-team__stats {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(158px, 1fr));
  gap: 16px;
  margin-top: 38px;
  padding-top: 30px;
  border-top: var(--about-line);
}

.page-about .about-team__stat {
  display: grid;
  gap: 10px;
  padding: 18px 18px 20px;
  border: var(--about-line);
  border-left: 6px solid var(--cyan);
  background: var(--ink-900);
}

.page-about .about-team__stat:nth-child(2) {
  border-left-color: var(--violet);
}

.page-about .about-team__stat:nth-child(3) {
  border-left-color: var(--blue);
}

.page-about .about-team__stat-num {
  font-size: 1.85rem;
  font-weight: 800;
  line-height: 1;
  color: var(--paper);
}

.page-about .about-team__unit {
  font-size: .9rem;
  margin-left: 3px;
  color: var(--mist);
}

.page-about .about-team__stat-label {
  font-size: .82rem;
  line-height: 1.6;
  color: var(--mist);
}

@media (min-width: 1024px) {
  .page-about .about-team__grid {
    grid-template-columns: minmax(0, 0.44fr) minmax(0, 0.56fr);
    gap: 48px;
    align-items: start;
  }
}

/* ---------- 栏目体系 ---------- */
.page-about .about-columns {
  display: grid;
  gap: 18px;
}

.page-about .about-column {
  position: relative;
  display: flex;
  flex-direction: column;
  gap: 12px;
  padding: 26px 22px 24px;
  border: var(--about-line);
  background: var(--ink-800);
  transition: transform .24s var(--ease), border-color .24s var(--ease);
}

.page-about .about-column:hover {
  transform: translateY(-5px);
  border-color: var(--cyan);
}

.page-about .about-column__num {
  font-size: 2rem;
  font-weight: 800;
  line-height: 1;
  color: rgba(34, 230, 210, .3);
}

.page-about .about-column:nth-child(2) .about-column__num {
  color: rgba(123, 92, 255, .42);
}

.page-about .about-column:nth-child(3) .about-column__num {
  color: rgba(61, 123, 255, .42);
}

.page-about .about-column__title {
  margin: 0;
  font-family: var(--font-display);
  font-size: 1.2rem;
  font-weight: 800;
  color: var(--paper);
}

.page-about .about-column__text {
  margin: 0;
  flex: 1;
  color: var(--mist);
  font-size: .93rem;
  line-height: 1.8;
}

.page-about .about-column__link {
  align-self: flex-start;
  color: var(--cyan);
  font-size: .86rem;
  font-weight: 600;
  text-decoration: none;
  border-bottom: 2px solid rgba(34, 230, 210, .4);
  padding-bottom: 2px;
  transition: border-color .2s var(--ease), color .2s var(--ease);
}

.page-about .about-column__link:hover,
.page-about .about-column__link:focus-visible {
  color: var(--paper);
  border-bottom-color: var(--paper);
}

@media (min-width: 900px) {
  .page-about .about-columns {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
  .page-about .about-column:nth-child(2) {
    margin-top: 26px;
  }
  .page-about .about-column:nth-child(3) {
    margin-top: 52px;
  }
}

/* ---------- 合作生态 ---------- */
.page-about .about-tabs__nav {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-bottom: 24px;
}

.page-about .about-tabs__nav .tab {
  padding: 11px 18px;
  border: var(--about-line);
  background: var(--ink-900);
  color: var(--mist);
  font-family: var(--font-display);
  font-size: .88rem;
  font-weight: 600;
  cursor: pointer;
  transition: color .2s var(--ease), border-color .2s var(--ease), background-color .2s var(--ease);
}

.page-about .about-tabs__nav .tab:hover {
  color: var(--paper);
  border-color: var(--cyan);
}

.page-about .about-tabs__nav .tab[aria-selected="true"] {
  background: var(--cyan);
  border-color: var(--cyan);
  color: var(--ink-900);
}

.page-about .about-tabs__nav .tab:focus-visible {
  outline: 3px solid var(--orange);
  outline-offset: 2px;
}

.page-about .about-tabs__panel {
  padding: 26px 22px;
  border: var(--about-line);
  background: var(--ink-900);
  box-shadow: var(--about-card-shadow);
}

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

.page-about .about-tabs__panel p {
  margin: 0;
  color: var(--mist);
  font-size: .95rem;
  line-height: 1.85;
  max-width: 62ch;
}

.page-about .about-tabs__note {
  margin-top: 16px;
  padding-top: 14px;
  border-top: 1px dashed var(--line-700);
  color: var(--cyan);
  font-size: .84rem;
}

/* ---------- 本地运营 ---------- */
.page-about .about-local__grid {
  display: grid;
  gap: 28px;
}

.page-about .about-local__title {
  margin: 0 0 18px;
  font-family: var(--font-display);
  font-size: clamp(1.4rem, 3vw, 1.9rem);
  font-weight: 900;
  line-height: 1.25;
  color: var(--paper);
}

.page-about .about-local__copy p {
  margin: 0 0 16px;
  color: var(--mist);
  line-height: 1.85;
}

.page-about .about-local__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 26px;
}

.page-about .about-local__card {
  padding: 24px 22px 20px;
  border: var(--about-line);
  border-left: 6px solid var(--violet);
  background: var(--ink-800);
  box-shadow: var(--about-card-shadow);
}

.page-about .about-local__k {
  margin: 0;
  font-size: .76rem;
  letter-spacing: .16em;
  text-transform: uppercase;
  color: var(--mist);
}

.page-about .about-local__v {
  margin: 10px 0 20px;
  font-size: 1.15rem;
  font-weight: 800;
  color: var(--cyan);
  word-break: break-all;
}

.page-about .about-local__list {
  margin: 0;
  display: grid;
  gap: 10px;
  border-top: 1px dashed var(--line-700);
  padding-top: 16px;
}

.page-about .about-local__row {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 14px;
}

.page-about .about-local__row dt {
  font-size: .84rem;
  color: var(--mist);
}

.page-about .about-local__row dd {
  margin: 0;
  font-size: .88rem;
  color: var(--paper);
}

@media (min-width: 900px) {
  .page-about .about-local__grid {
    grid-template-columns: minmax(0, 0.58fr) minmax(0, 0.42fr);
    gap: 48px;
    align-items: start;
  }
}