/* ===== 页面作用域：平台介绍 ===== */
.page-about {
  --ab-idx: 92px;
  --ab-on-paper: #39433E;
  --ab-on-paper-strong: #0B0F0D;
  background: var(--ink-green);
  color: var(--white);
  overflow-x: clip;
}

.page-about .ab-crumbs {
  margin-bottom: 22px;
  font-size: 13px;
}

.page-about .ab-crumb-sep {
  margin: 0 8px;
  color: var(--muted);
}

/* ---------- 首屏 ---------- */
.page-about .ab-hero {
  position: relative;
  padding: calc(var(--header-h) + 44px) 0 clamp(48px, 8vw, 84px);
  background: var(--ink-green);
  border-bottom: 1px solid var(--line);
  overflow: hidden;
}

.page-about .ab-hero-media {
  position: absolute;
  inset: 0;
  z-index: 0;
}

.page-about .ab-hero-media img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: 0.26;
  filter: saturate(0.75) contrast(1.05);
}

.page-about .ab-hero::after {
  content: "";
  position: absolute;
  inset: 0;
  z-index: 1;
  background:
    linear-gradient(180deg, rgba(7, 26, 20, 0.7) 0%, rgba(7, 26, 20, 0.9) 55%, var(--ink-green) 100%),
    repeating-linear-gradient(90deg, rgba(247, 251, 249, 0.05) 0 1px, transparent 1px 96px);
  pointer-events: none;
}

.page-about .ab-hero-inner {
  position: relative;
  z-index: 2;
}

.page-about .ab-hero-frame {
  border: 1px solid var(--line);
  border-left: 3px solid var(--accent);
  background: rgba(7, 26, 20, 0.56);
  padding: 26px 20px 28px;
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 28px), calc(100% - 28px) 100%, 0 100%);
}

.page-about .ab-kicker {
  margin: 0 0 14px;
  color: var(--accent);
  font-size: 11px;
  letter-spacing: 0.26em;
  text-transform: uppercase;
}

.page-about .ab-h1 {
  margin: 0 0 18px;
  max-width: 800px;
  font-size: clamp(30px, 6.4vw, 56px);
  line-height: 1.08;
  letter-spacing: -0.02em;
  color: var(--white);
}

.page-about .ab-lede {
  margin: 0;
  max-width: 720px;
  color: var(--muted-lift);
  font-size: clamp(15px, 1.6vw, 17px);
  line-height: 1.8;
}

.page-about .ab-hero-stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin-top: 32px;
  background: var(--line);
  border: 1px solid var(--line);
}

.page-about .ab-hstat {
  background: rgba(8, 20, 38, 0.86);
  padding: 16px 14px;
}

.page-about .ab-hstat-v {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(26px, 5.4vw, 42px);
  font-weight: 800;
  line-height: 1;
  letter-spacing: -0.03em;
  color: var(--accent);
}

.page-about .ab-hstat-v em {
  font-style: normal;
  font-size: 0.5em;
  margin-left: 3px;
  color: var(--accent);
}

.page-about .ab-hstat-l {
  display: block;
  margin-top: 9px;
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--muted-lift);
}

/* ---------- 通用章节 ---------- */
.page-about .ab-sec {
  position: relative;
  padding: clamp(48px, 8vw, 88px) 0;
}

.page-about .ab-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 18px;
}

.page-about .ab-index {
  display: flex;
  align-items: baseline;
  gap: 12px;
  padding-left: 12px;
  border-left: 2px solid var(--line-accent);
}

.page-about .ab-index-num {
  font-family: var(--font-mono);
  font-size: 32px;
  font-weight: 800;
  line-height: 1;
  letter-spacing: -0.04em;
  color: var(--accent);
}

.page-about .ab-index-label {
  font-size: 11px;
  letter-spacing: 0.26em;
  color: var(--muted-lift);
}

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

.page-about .ab-body .t-h2 {
  margin: 0 0 16px;
  font-size: clamp(23px, 3.6vw, 34px);
  line-height: 1.2;
  letter-spacing: -0.01em;
  color: var(--white);
}

.page-about .ab-lede-sm {
  margin: 0;
  max-width: 720px;
  color: var(--muted-lift);
  font-size: 15px;
  line-height: 1.8;
}

/* ---------- 01 定位 ---------- */
.page-about .ab-position {
  background: var(--night-blue);
}

.page-about .ab-aud {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 14px;
  margin-top: 30px;
}

.page-about .ab-aud-card {
  position: relative;
  padding: 22px 20px 24px;
  background: var(--pitch);
  border: 1px solid var(--line);
  border-top: 3px solid var(--accent);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 18px), calc(100% - 18px) 100%, 0 100%);
}

.page-about .ab-aud-tag {
  margin: 0 0 12px;
  font-size: 11px;
  letter-spacing: 0.2em;
  color: var(--accent);
}

.page-about .ab-aud-card .t-h3 {
  margin: 0 0 10px;
  font-size: 18px;
  line-height: 1.35;
  color: var(--white);
}

.page-about .ab-aud-card .t-body {
  margin: 0;
  font-size: 14px;
  line-height: 1.8;
  color: var(--muted-lift);
}

/* ---------- 02 历程 ---------- */
.page-about .ab-journey {
  background: var(--ink-green);
}

.page-about .ab-rail {
  margin: 28px 0 10px;
  color: var(--line);
}

.page-about .ab-rail svg {
  display: block;
  width: 100%;
  height: clamp(46px, 8vw, 76px);
}

.page-about .ab-tab-list {
  display: flex;
  gap: 8px;
  overflow-x: auto;
  padding-bottom: 8px;
  scrollbar-width: thin;
}

.page-about .ab-tab {
  flex: 0 0 138px;
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: 13px 14px;
  background: var(--night-blue);
  border: 1px solid var(--line);
  border-top: 3px solid transparent;
  color: var(--muted-lift);
  text-align: left;
  cursor: pointer;
  font-family: inherit;
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 14px), calc(100% - 14px) 100%, 0 100%);
  transition: border-color 0.18s ease, color 0.18s ease, background 0.18s ease;
}

.page-about .ab-tab:hover {
  border-top-color: var(--line-accent);
  color: var(--white);
}

.page-about .ab-tab[aria-selected="true"] {
  background: var(--pitch);
  border-color: var(--line);
  border-top-color: var(--accent);
  color: var(--white);
}

.page-about .ab-tab-v {
  font-family: var(--font-mono);
  font-size: 20px;
  font-weight: 800;
  line-height: 1;
  letter-spacing: -0.03em;
  color: var(--accent);
}

.page-about .ab-tab-n {
  font-size: 12.5px;
  letter-spacing: 0.04em;
}

.page-about .ab-panel {
  margin-top: 16px;
  padding: 22px 20px 24px;
  background: var(--night-blue);
  border: 1px solid var(--line);
  border-left: 3px solid var(--accent);
}

.page-about .ab-panel-meta {
  margin: 0 0 12px;
  font-size: 11px;
  letter-spacing: 0.14em;
  color: var(--cyan);
}

.page-about .ab-panel .t-h3 {
  margin: 0 0 12px;
  font-size: 19px;
  line-height: 1.35;
  color: var(--white);
}

.page-about .ab-panel .t-body {
  margin: 0 0 16px;
  font-size: 14px;
  line-height: 1.85;
  color: var(--muted-lift);
}

.page-about .ab-panel-list {
  margin: 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 8px;
}

.page-about .ab-panel-list li {
  position: relative;
  padding-left: 16px;
  font-family: var(--font-mono);
  font-size: 12.5px;
  line-height: 1.6;
  color: var(--white);
}

.page-about .ab-panel-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.62em;
  width: 7px;
  height: 2px;
  background: var(--accent);
}

/* ---------- 03 覆盖 ---------- */
.page-about .ab-coverage {
  background: var(--pitch);
}

.page-about .ab-cov-split {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 24px;
  margin-top: 30px;
}

.page-about .ab-league-list {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 0 0 22px;
  padding: 0;
  list-style: none;
}

.page-about .ab-league-list li {
  padding: 7px 13px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--white);
  background: rgba(7, 26, 20, 0.55);
  border: 1px solid var(--line);
}

.page-about .ab-cov-dl {
  margin: 0;
  border-top: 1px solid var(--line);
}

.page-about .ab-cov-row {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 4px;
  padding: 13px 0;
  border-bottom: 1px solid var(--line-soft);
}

.page-about .ab-cov-row dt {
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.14em;
  color: var(--accent);
}

.page-about .ab-cov-row dd {
  margin: 0;
  font-size: 14px;
  line-height: 1.7;
  color: var(--white);
}

.page-about .ab-cov-figure {
  margin: 0;
}

.page-about .ab-shot {
  position: relative;
  overflow: hidden;
  background: var(--ink-green);
  border: 1px solid var(--line);
}

.page-about .ab-shot img {
  display: block;
  width: 100%;
  height: 100%;
  max-width: 100%;
  object-fit: cover;
}

.page-about .ab-shot-cov {
  aspect-ratio: 4 / 3;
}

.page-about .ab-cov-figure .media-caption,
.page-about .ab-team-figure .media-caption {
  display: block;
  margin-top: 10px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  line-height: 1.6;
  color: var(--muted-lift);
}

/* ---------- 04 团队 ---------- */
.page-about .ab-team {
  background: var(--paper);
  color: var(--ab-on-paper-strong);
}

.page-about .ab-team .ab-index {
  border-left-color: var(--pitch);
}

.page-about .ab-team .ab-index-num {
  color: var(--pitch);
}

.page-about .ab-team .ab-index-label {
  color: #5C6A63;
}

.page-about .ab-team .ab-body .t-h2 {
  color: var(--ab-on-paper-strong);
}

.page-about .ab-team .ab-lede-sm {
  color: var(--ab-on-paper);
}

.page-about .ab-team-split {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 26px;
  margin-top: 28px;
}

.page-about .ab-team-list {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 18px;
}

.page-about .ab-team-tab {
  padding: 10px 16px;
  background: #FFFFFF;
  border: 1px solid rgba(11, 15, 13, 0.16);
  color: var(--ab-on-paper-strong);
  font-family: inherit;
  font-size: 13.5px;
  letter-spacing: 0.02em;
  cursor: pointer;
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 10px), calc(100% - 10px) 100%, 0 100%);
  transition: background 0.18s ease, color 0.18s ease, border-color 0.18s ease;
}

.page-about .ab-team-tab:hover {
  border-color: var(--pitch);
}

.page-about .ab-team-tab[aria-selected="true"] {
  background: var(--pitch);
  border-color: var(--pitch);
  color: var(--white);
}

.page-about .ab-team-panel {
  padding: 20px 20px 22px;
  background: rgba(255, 255, 255, 0.72);
  border-left: 3px solid var(--pitch);
}

.page-about .ab-team-panel .t-h3 {
  margin: 0 0 10px;
  font-size: 18px;
  line-height: 1.35;
  color: var(--ab-on-paper-strong);
}

.page-about .ab-team-panel .t-body {
  margin: 0;
  font-size: 14px;
  line-height: 1.85;
  color: var(--ab-on-paper);
}

.page-about .ab-team-figure {
  margin: 0;
}

.page-about .ab-shot-team {
  aspect-ratio: 3 / 2;
  border-color: rgba(11, 15, 13, 0.18);
}

.page-about .ab-team-figure .media-caption {
  color: #5C6A63;
}

/* ---------- 05 生态 ---------- */
.page-about .ab-eco {
  background: var(--night-blue);
}

.page-about .ab-eco-track {
  display: flex;
  gap: 14px;
  margin-top: 28px;
  overflow-x: auto;
  scroll-snap-type: x mandatory;
  padding-bottom: 14px;
  -webkit-overflow-scrolling: touch;
}

.page-about .ab-eco-track:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 4px;
}

.page-about .ab-eco-card {
  flex: 0 0 78%;
  scroll-snap-align: start;
  padding: 22px 20px 24px;
  background: var(--pitch);
  border: 1px solid var(--line);
  border-bottom: 3px solid var(--accent);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 18px), calc(100% - 18px) 100%, 0 100%);
}

.page-about .ab-eco-tag {
  margin: 0 0 14px;
  font-size: 11px;
  letter-spacing: 0.2em;
  color: var(--cyan);
}

.page-about .ab-eco-num {
  margin: 0 0 6px;
  font-family: var(--font-mono);
  font-size: 42px;
  font-weight: 800;
  line-height: 1;
  letter-spacing: -0.04em;
  color: var(--accent);
}

.page-about .ab-eco-card .t-h3 {
  margin: 0 0 12px;
  font-size: 17px;
  line-height: 1.35;
  color: var(--white);
}

.page-about .ab-eco-card .t-body {
  margin: 0;
  font-size: 13.5px;
  line-height: 1.8;
  color: var(--muted-lift);
}

.page-about .ab-eco-card-honor {
  border-bottom-color: var(--alert);
}

.page-about .ab-eco-badge {
  margin: 0 0 12px;
  padding: 8px 12px;
  display: inline-block;
  font-size: 14px;
  font-weight: 700;
  line-height: 1.4;
  color: var(--ink);
  background: var(--accent);
}

/* ---------- 06 理由 ---------- */
.page-about .ab-why {
  background: var(--ink-green);
}

.page-about .ab-why-list {
  margin: 30px 0 0;
  padding: 0;
  list-style: none;
  border-top: 1px solid var(--line);
}

.page-about .ab-why-item {
  display: grid;
  grid-template-columns: 52px minmax(0, 1fr);
  gap: 14px;
  padding: 22px 0;
  border-bottom: 1px solid var(--line-soft);
}

.page-about .ab-why-num {
  font-size: 22px;
  font-weight: 800;
  line-height: 1.1;
  letter-spacing: -0.03em;
  color: var(--accent);
}

.page-about .ab-why-copy .t-h3 {
  margin: 0 0 8px;
  font-size: 17px;
  line-height: 1.4;
  color: var(--white);
}

.page-about .ab-why-copy .t-body {
  margin: 0;
  font-size: 14px;
  line-height: 1.8;
  color: var(--muted-lift);
}

/* ---------- 07 联系 ---------- */
.page-about .ab-cta {
  padding: clamp(48px, 8vw, 84px) 0;
  background: var(--pitch);
  border-top: 3px solid var(--accent);
}

.page-about .ab-cta-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 26px;
  align-items: start;
}

.page-about .ab-cta-h2 {
  margin: 0 0 14px;
  font-size: clamp(22px, 3.4vw, 32px);
  line-height: 1.22;
  color: var(--white);
}

.page-about .ab-cta-body {
  margin: 0;
  max-width: 620px;
  font-size: 14.5px;
  line-height: 1.85;
  color: var(--muted-lift);
}

.page-about .ab-cta-link {
  color: var(--accent);
  word-break: break-all;
}

.page-about .ab-cta-actions {
  display: grid;
  gap: 12px;
}

.page-about .ab-cta-btn {
  width: 100%;
}

.page-about .ab-cta-note {
  margin: 4px 0 0;
  font-size: 12.5px;
  line-height: 1.8;
  color: var(--muted-lift);
}

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

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

  .page-about .ab-cov-row {
    grid-template-columns: 148px minmax(0, 1fr);
    gap: 16px;
    align-items: baseline;
  }

  .page-about .ab-eco-card {
    flex: 0 0 320px;
  }

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

  .page-about .ab-cta-note {
    grid-column: 1 / -1;
  }
}

@media (min-width: 860px) {
  .page-about .ab-grid {
    grid-template-columns: var(--ab-idx) minmax(0, 1fr);
    gap: 40px;
  }

  .page-about .ab-index {
    flex-direction: column;
    align-items: flex-start;
    gap: 10px;
    position: sticky;
    top: calc(var(--header-h) + 24px);
    align-self: start;
    padding-left: 0;
    padding-top: 14px;
    border-left: 0;
    border-top: 3px solid var(--line-accent);
  }

  .page-about .ab-team .ab-index {
    border-top-color: var(--pitch);
  }

  .page-about .ab-index-num {
    font-size: 40px;
  }

  .page-about .ab-hero-frame {
    padding: 40px 36px 44px;
  }

  .page-about .ab-tab-list {
    display: grid;
    grid-template-columns: repeat(5, minmax(0, 1fr));
    overflow: visible;
    padding-bottom: 0;
  }

  .page-about .ab-tab {
    flex: none;
  }

  .page-about .ab-panel {
    display: grid;
    grid-template-columns: minmax(0, 1.35fr) minmax(0, 0.85fr);
    gap: 32px;
    align-items: start;
    padding: 28px 28px 30px;
  }

  .page-about .ab-panel .t-body {
    margin-bottom: 0;
  }

  .page-about .ab-cov-split {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, 0.95fr);
    gap: 34px;
    align-items: start;
  }

  .page-about .ab-team-split {
    grid-template-columns: minmax(0, 1.1fr) minmax(0, 0.9fr);
    gap: 32px;
    align-items: start;
  }

  .page-about .ab-why-item {
    grid-template-columns: 68px minmax(0, 1fr);
    gap: 22px;
    padding: 26px 0;
  }

  .page-about .ab-why-num {
    font-size: 28px;
  }

  .page-about .ab-cta-grid {
    grid-template-columns: minmax(0, 1.25fr) minmax(0, 0.75fr);
    gap: 44px;
    align-items: center;
  }
}

@media (min-width: 1100px) {
  .page-about .ab-hero-frame {
    padding: 48px 44px 52px;
  }

  .page-about .ab-eco-card {
    flex: 0 0 340px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .ab-tab,
  .page-about .ab-team-tab {
    transition: none;
  }
}
</final>