.page-about {
  --ab-cut: 40px;
  --ab-ink-soft: rgba(43, 49, 56, .42);
  --ab-ink-line: rgba(12, 26, 43, .15);
  --ab-ink-text: rgba(12, 26, 43, .68);
  display: block;
}

/* ---------- 面包屑 ---------- */
.page-about .ab-crumb {
  padding-top: 20px;
  padding-bottom: 4px;
}

/* ---------- 首屏 ---------- */
.page-about .ab-hero {
  position: relative;
  overflow: hidden;
  padding: 28px 0 64px;
  background:
    radial-gradient(760px 380px at 88% 4%, rgba(127, 211, 247, .16), transparent 68%),
    radial-gradient(520px 320px at 4% 96%, rgba(196, 100, 60, .16), transparent 70%),
    linear-gradient(180deg, var(--ink-deep) 0%, var(--ink) 68%, var(--ink) 100%);
}

.page-about .ab-hero::after {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  opacity: .07;
  background-image:
    repeating-linear-gradient(90deg, transparent 0 78px, rgba(241, 236, 226, .5) 78px 79px),
    repeating-linear-gradient(0deg, transparent 0 78px, rgba(241, 236, 226, .5) 78px 79px);
}

.page-about .ab-hero-inner {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: 1fr;
  gap: 34px;
  align-items: center;
}

.page-about .ab-hero h1 {
  margin: 12px 0 0;
  font-family: var(--f-sans);
  font-weight: 900;
  font-size: clamp(30px, 7.2vw, 52px);
  line-height: 1.16;
  letter-spacing: -.015em;
  color: var(--paper);
}

.page-about .ab-hero-lede {
  max-width: 50ch;
  margin: 18px 0 0;
  font-size: 15px;
  line-height: 1.7;
  color: var(--text-soft);
}

.page-about .ab-hero-stats {
  display: flex;
  flex-wrap: wrap;
  gap: 14px 30px;
  margin: 26px 0 0;
  padding: 0;
  list-style: none;
}

.page-about .ab-hero-stats .stat {
  padding-left: 14px;
  border-left: 2px solid var(--clay);
  min-width: 120px;
}

.page-about .ab-hero-stats .stat-value {
  display: block;
  font-family: var(--f-mono);
  font-size: 26px;
  font-weight: 700;
  line-height: 1.1;
  color: var(--neon);
}

.page-about .ab-hero-stats .stat-label {
  display: block;
  margin-top: 6px;
  font-size: 12px;
  letter-spacing: .04em;
  color: var(--text-soft);
}

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

.page-about .ab-hero-media {
  position: relative;
  margin: 0;
  border: 1px solid var(--line-strong);
  background: var(--panel);
  clip-path: polygon(0 0, calc(100% - 48px) 0, 100% 48px, 100% 100%, 0 100%);
}

.page-about .ab-hero-media img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 7 / 5;
  object-fit: cover;
  filter: saturate(.9) contrast(1.06);
}

.page-about .ab-hero-media .media-caption {
  padding: 12px 16px;
  font-family: var(--f-mono);
  font-size: 12px;
  letter-spacing: .04em;
  color: var(--text-soft);
  border-top: 1px solid var(--line);
}

/* ---------- 通用区块 ---------- */
.page-about .ab-block {
  position: relative;
  padding: 56px 0;
}

.page-about .ab-block--ink {
  background: var(--ink);
  color: var(--paper);
}

.page-about .ab-block--deep {
  background: linear-gradient(180deg, var(--ink) 0%, var(--ink-deep) 100%);
  color: var(--paper);
}

.page-about .ab-block--deep::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 1px;
  background: var(--line);
}

.page-about .ab-block--paper {
  background: var(--paper);
  color: var(--black);
  --line: rgba(12, 26, 43, .16);
  --line-strong: rgba(12, 26, 43, .38);
  --text-soft: rgba(12, 26, 43, .66);
}

.page-about .ab-block--paper::after {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  opacity: .05;
  background-image:
    repeating-linear-gradient(0deg, transparent 0 5px, rgba(12, 26, 43, .6) 5px 6px);
}

.page-about .ab-block > .container {
  position: relative;
  z-index: 1;
}

.page-about .ab-head {
  margin-bottom: 30px;
}

.page-about .ab-head-text .section-title {
  margin: 8px 0 0;
  font-size: clamp(21px, 4vw, 33px);
  font-weight: 800;
  line-height: 1.24;
  letter-spacing: -.01em;
}

.page-about .ab-block--paper .eyebrow,
.page-about .ab-block--paper .ab-side-note-title {
  color: var(--clay);
}

/* ---------- 01 双栏 ---------- */
.page-about .ab-two {
  display: grid;
  grid-template-columns: 1fr;
  gap: 26px;
}

.page-about .ab-two-main p {
  margin: 0 0 14px;
  font-size: 15px;
  line-height: 1.75;
  color: var(--text-soft);
}

.page-about .ab-two-main .lede {
  font-size: 16px;
  line-height: 1.72;
  color: var(--paper);
}

.page-about .ab-side-note {
  border: 1px solid var(--line);
  border-top: 3px solid var(--moss);
  background: var(--ab-ink-soft);
  padding: 20px;
}

.page-about .ab-side-note-title {
  margin: 0 0 14px;
  font-family: var(--f-mono);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: .14em;
  text-transform: uppercase;
  color: var(--neon);
}

.page-about .ab-side-list {
  margin: 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 10px;
}

.page-about .ab-side-list li {
  position: relative;
  padding-left: 18px;
  font-size: 14px;
  line-height: 1.6;
  color: var(--text-soft);
}

.page-about .ab-side-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: .55em;
  width: 8px;
  height: 8px;
  background: var(--clay);
  clip-path: polygon(0 0, 100% 0, 100% 100%);
}

/* ---------- 02 栏目清单 ---------- */
.page-about .ab-columns {
  margin: 0;
  padding: 0;
  list-style: none;
  display: grid;
  grid-template-columns: 1fr;
  gap: 14px;
  counter-reset: none;
}

.page-about .ab-col-item {
  display: grid;
  grid-template-columns: 46px minmax(0, 1fr);
  gap: 12px 14px;
  padding: 18px;
  border: 1px solid var(--ab-ink-line);
  background: rgba(255, 255, 255, .68);
}

.page-about .ab-col-no {
  font-family: var(--f-mono);
  font-size: 22px;
  font-weight: 700;
  line-height: 1;
  color: var(--clay);
}

.page-about .ab-col-text h3 {
  margin: 0;
  font-size: 18px;
  font-weight: 800;
  line-height: 1.3;
  color: var(--black);
}

.page-about .ab-col-text p {
  margin: 8px 0 12px;
  font-size: 14px;
  line-height: 1.68;
  color: var(--ab-ink-text);
}

/* ---------- 折叠补充 ---------- */
.page-about .ab-more {
  margin-top: 26px;
  border: 1px solid var(--line);
  border-left: 3px solid var(--moss);
  background: var(--ab-ink-soft);
  padding: 0 18px;
}

.page-about .ab-more summary {
  cursor: pointer;
  padding: 15px 0;
  font-family: var(--f-mono);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: .1em;
  color: var(--neon);
  list-style: none;
}

.page-about .ab-more summary::-webkit-details-marker {
  display: none;
}

.page-about .ab-more summary::before {
  content: "＋ ";
  color: var(--clay);
}

.page-about .ab-more[open] summary::before {
  content: "－ ";
}

.page-about .ab-more p {
  margin: 0 0 18px;
  font-size: 14px;
  line-height: 1.72;
  color: var(--text-soft);
}

.page-about .ab-block--paper .ab-more {
  background: rgba(12, 26, 43, .045);
  border-left-color: var(--clay);
}

.page-about .ab-block--paper .ab-more summary {
  color: var(--clay);
}

.page-about .ab-block--paper .ab-more p {
  color: var(--ab-ink-text);
}

/* ---------- 03 流程 ---------- */
.page-about .ab-flow {
  display: grid;
  grid-template-columns: 1fr;
  gap: 28px;
}

.page-about .ab-flow-list {
  margin: 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 16px;
}

.page-about .ab-flow-item {
  position: relative;
  padding: 18px 18px 18px 62px;
  border: 1px solid var(--line);
  background: var(--ab-ink-soft);
}

.page-about .ab-flow-no {
  position: absolute;
  left: 16px;
  top: 18px;
  width: 30px;
  height: 30px;
  display: grid;
  place-items: center;
  font-family: var(--f-mono);
  font-size: 14px;
  font-weight: 700;
  color: var(--ink-deep);
  background: var(--neon);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 8px), calc(100% - 8px) 100%, 0 100%);
}

.page-about .ab-flow-item h3 {
  margin: 0;
  font-size: 17px;
  font-weight: 800;
  line-height: 1.3;
  color: var(--paper);
}

.page-about .ab-flow-item p {
  margin: 8px 0 0;
  font-size: 14px;
  line-height: 1.7;
  color: var(--text-soft);
}

.page-about .ab-flow-media {
  margin: 0;
}

.page-about .ab-flow-media img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 3 / 2;
  object-fit: cover;
}

/* ---------- 04 历程 ---------- */
.page-about .ab-year-axis {
  position: relative;
  display: flex;
  margin: 0 0 34px;
  padding: 0;
  list-style: none;
}

.page-about .ab-year-axis::before {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  top: 7px;
  height: 1px;
  background: var(--line-strong);
}

.page-about .ab-year-axis li {
  flex: 1 1 0;
  min-width: 0;
}

.page-about .ab-year-axis a {
  position: relative;
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 10px;
  text-decoration: none;
  font-family: var(--f-mono);
  font-size: 12px;
  letter-spacing: .06em;
  color: var(--text-soft);
}

.page-about .ab-dot {
  position: relative;
  z-index: 1;
  width: 15px;
  height: 15px;
  border-radius: 50%;
  background: var(--clay);
  border: 3px solid var(--ink-deep);
  transition: transform .18s ease, background-color .18s ease;
}

.page-about .ab-year-axis a:hover .ab-dot,
.page-about .ab-year-axis a:focus-visible .ab-dot {
  transform: scale(1.35);
  background: var(--neon);
}

.page-about .ab-year-axis a:hover .ab-year-label,
.page-about .ab-year-axis a:focus-visible .ab-year-label {
  color: var(--neon);
}

.page-about .ab-year-list {
  display: grid;
  grid-template-columns: 1fr;
  gap: 16px;
}

.page-about .ab-year-item {
  border: 1px solid var(--line);
  border-top: 3px solid var(--clay);
  background: var(--ab-ink-soft);
  padding: 20px;
  scroll-margin-top: 96px;
  transition: border-top-color .18s ease, background-color .18s ease;
}

.page-about .ab-year-item:hover,
.page-about .ab-year-item:target {
  border-top-color: var(--neon);
  background: rgba(182, 255, 60, .06);
}

.page-about .ab-year-badge {
  display: inline-block;
  font-family: var(--f-mono);
  font-size: 13px;
  font-weight: 700;
  letter-spacing: .08em;
  color: var(--ink-deep);
  background: var(--clay);
  padding: 3px 9px;
}

.page-about .ab-year-item h3 {
  margin: 14px 0 0;
  font-size: 18px;
  font-weight: 800;
  line-height: 1.3;
  color: var(--paper);
}

.page-about .ab-year-item p {
  margin: 8px 0 0;
  font-size: 14px;
  line-height: 1.72;
  color: var(--text-soft);
}

/* ---------- 05 团队 ---------- */
.page-about .ab-team {
  margin: 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 18px;
}

.page-about .ab-team-row {
  padding: 18px 20px;
  border: 1px solid var(--ab-ink-line);
  background: rgba(255, 255, 255, .68);
}

.page-about .ab-team-meta {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 12px;
}

.page-about .ab-team-name {
  font-size: 16px;
  font-weight: 800;
  color: var(--black);
}

.page-about .ab-team-num {
  font-family: var(--f-mono);
  font-size: 16px;
  font-weight: 700;
  color: var(--clay);
}

.page-about .ab-team-track {
  position: relative;
  height: 10px;
  margin-top: 12px;
  background: rgba(12, 26, 43, .1);
  overflow: hidden;
}

.page-about .ab-team-fill {
  display: block;
  height: 100%;
  width: 40%;
  background: var(--moss);
  transition: width .5s ease;
}

.page-about .ab-team-row:nth-child(1) .ab-team-fill { width: 100%; }
.page-about .ab-team-row:nth-child(2) .ab-team-fill { width: 64%; }
.page-about .ab-team-row:nth-child(3) .ab-team-fill { width: 55%; }
.page-about .ab-team-row:nth-child(4) .ab-team-fill { width: 36%; }

.page-about .ab-team-row:nth-child(2) .ab-team-fill { background: var(--clay); }
.page-about .ab-team-row:nth-child(3) .ab-team-fill { background: var(--ice); }
.page-about .ab-team-row:nth-child(4) .ab-team-fill { background: var(--amber); }

.page-about .ab-team-duty {
  margin: 12px 0 0;
  font-size: 13px;
  line-height: 1.66;
  color: var(--ab-ink-text);
  opacity: .76;
  transition: opacity .18s ease;
}

.page-about .ab-team-row:hover .ab-team-duty,
.page-about .ab-team-row:focus-within .ab-team-duty {
  opacity: 1;
}

.page-about .ab-duty-band {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1px;
  margin-top: 32px;
  background: var(--ab-ink-line);
  border: 1px solid var(--ab-ink-line);
}

.page-about .ab-duty-cell {
  background: var(--paper);
  padding: 18px;
}

.page-about .ab-duty-label {
  display: inline-block;
  font-family: var(--f-mono);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: .1em;
  color: var(--moss);
  border-bottom: 2px solid var(--clay);
  padding-bottom: 4px;
}

.page-about .ab-duty-cell p {
  margin: 12px 0 0;
  font-size: 14px;
  line-height: 1.68;
  color: var(--ab-ink-text);
}

/* ---------- 06 合作生态 ---------- */
.page-about .ab-partner-intro .lede {
  max-width: 62ch;
  margin: 0;
  font-size: 15px;
  line-height: 1.75;
  color: var(--text-soft);
}

.page-about .ab-wall {
  display: grid;
  grid-template-columns: 1fr;
  gap: 22px;
  margin-top: 30px;
}

.page-about .ab-wall-group {
  border: 1px solid var(--line);
  background: var(--ab-ink-soft);
  padding: 18px;
}

.page-about .ab-wall-head {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 12px;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--line);
}

.page-about .ab-wall-kicker {
  font-size: 15px;
  font-weight: 800;
  color: var(--paper);
}

.page-about .ab-wall-count {
  font-family: var(--f-mono);
  font-size: 11px;
  letter-spacing: .06em;
  color: var(--ice);
}

.page-about .ab-wall-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 14px 0 0;
  padding: 0;
  list-style: none;
}

.page-about .ab-wall-tag {
  border: 1px solid var(--line-strong);
  padding: 6px 11px;
  font-size: 12.5px;
  line-height: 1.4;
  color: var(--text-soft);
  transition: border-color .16s ease, color .16s ease;
}

.page-about .ab-wall-tag:hover {
  border-color: var(--neon);
  color: var(--neon);
}

.page-about .ab-partner-media {
  margin: 30px 0 0;
}

.page-about .ab-partner-media img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 3 / 2;
  object-fit: cover;
}

.page-about .ab-partner-foot {
  margin: 24px 0 0;
  font-size: 14.5px;
  line-height: 1.72;
  color: var(--text-soft);
}

.page-about .ab-inline-link {
  color: var(--neon);
  text-decoration: none;
  border-bottom: 1px solid var(--neon);
  padding-bottom: 1px;
}

.page-about .ab-inline-link:hover {
  color: var(--amber);
  border-bottom-color: var(--amber);
}

/* ---------- 07 认可 ---------- */
.page-about .ab-awards {
  margin: 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 12px;
}

.page-about .ab-award {
  display: grid;
  grid-template-columns: 62px minmax(0, 1fr);
  gap: 14px;
  align-items: start;
  padding: 16px 18px;
  border: 1px solid var(--ab-ink-line);
  background: rgba(255, 255, 255, .62);
}

.page-about .ab-award-year {
  font-family: var(--f-mono);
  font-size: 15px;
  font-weight: 700;
  line-height: 1.4;
  color: var(--clay);
  border-right: 1px solid var(--ab-ink-line);
  padding-right: 8px;
}

.page-about .ab-award-body h3 {
  margin: 0;
  font-size: 16px;
  font-weight: 800;
  line-height: 1.34;
  color: var(--black);
}

.page-about .ab-award-body p {
  margin: 8px 0 0;
  font-size: 13.5px;
  line-height: 1.7;
  color: var(--ab-ink-text);
}

/* ---------- 结尾 ---------- */
.page-about .ab-cta {
  background: linear-gradient(135deg, var(--ink-deep) 0%, var(--ink) 56%, #16283d 100%);
  padding: 52px 0 60px;
}

.page-about .ab-cta-inner {
  display: grid;
  grid-template-columns: 1fr;
  gap: 26px;
  align-items: center;
}

.page-about .ab-cta-copy h2 {
  margin: 10px 0 0;
  font-size: clamp(21px, 4.2vw, 32px);
  font-weight: 900;
  line-height: 1.22;
  color: var(--paper);
}

.page-about .ab-cta-copy p {
  margin: 14px 0 0;
  max-width: 52ch;
  font-size: 14.5px;
  line-height: 1.72;
  color: var(--text-soft);
}

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

/* ---------- 响应式 ---------- */
@media (min-width: 720px) {
  .page-about .ab-hero {
    padding: 40px 0 80px;
  }

  .page-about .ab-block {
    padding: 72px 0;
  }

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

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

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

  .page-about .ab-cta {
    padding: 64px 0 72px;
  }

  .page-about .ab-cta-inner {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    gap: 40px;
  }

  .page-about .ab-cta-actions {
    justify-content: flex-end;
  }
}

@media (min-width: 960px) {
  .page-about .ab-hero-inner {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    gap: 48px;
  }

  .page-about .ab-two {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    gap: 44px;
  }

  .page-about .ab-columns {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 16px 20px;
  }

  .page-about .ab-flow {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    gap: 40px;
    align-items: start;
  }

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

  .page-about .ab-team {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 20px;
  }
}

@media (min-width: 1240px) {
  .page-about .ab-hero h1 {
    font-size: 54px;
  }

  .page-about .ab-year-list {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .ab-dot,
  .page-about .ab-team-fill,
  .page-about .ab-team-duty,
  .page-about .ab-year-item,
  .page-about .ab-wall-tag {
    transition: none;
  }
}