.page-about {
  background: var(--paper);
  color: var(--text);
  font-family: var(--font-sans);
  overflow-x: hidden;
}

.page-about a {
  color: var(--blue);
  text-decoration: underline;
  text-underline-offset: 3px;
}

.page-about a:hover {
  color: var(--orange);
}

.page-about .media {
  display: block;
  width: 100%;
  overflow: hidden;
  border: 1px solid var(--line);
}

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

/* ---------- 首屏 ---------- */
.page-about .ab-hero {
  position: relative;
  padding: 18px 0 0;
  border-bottom: 1px solid var(--line);
  background: var(--paper);
}

.page-about .ab-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(to right, rgba(140, 154, 166, 0.16) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(140, 154, 166, 0.16) 1px, transparent 1px);
  background-size: 56px 56px;
  pointer-events: none;
}

.page-about .ab-hero-grid {
  position: relative;
  display: grid;
  gap: 26px;
  padding: 22px 0 30px;
}

.page-about .ab-eyebrow {
  display: inline-block;
  margin: 0 0 16px;
  padding: 5px 10px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--mint-deep);
  background: rgba(100, 224, 176, 0.16);
  border: 1px solid var(--mint);
}

.page-about .ab-hero h1 {
  margin: 0 0 18px;
  max-width: 15em;
  font-size: clamp(28px, 6.2vw, 52px);
  font-weight: 800;
  line-height: 1.1;
  letter-spacing: -0.015em;
  color: var(--ink);
}

.page-about .ab-lead {
  margin: 0;
  max-width: 34em;
  font-size: 16px;
  line-height: 1.85;
  letter-spacing: 0.01em;
  color: var(--sea);
}

.page-about .ab-hero-panel {
  padding: 22px 20px 6px;
  background: var(--ink);
  border-top: 3px solid var(--orange);
}

.page-about .ab-panel-label {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--mint);
}

.page-about .ab-panel-num {
  margin: 4px 0 18px;
  font-family: var(--font-mono);
  font-size: clamp(44px, 12vw, 66px);
  font-weight: 600;
  line-height: 1;
  letter-spacing: 0.02em;
  font-variant-numeric: tabular-nums;
  color: var(--paper);
}

.page-about .ab-panel-list {
  margin: 0;
}

.page-about .ab-panel-list > div {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 16px;
  padding: 12px 0;
  border-top: 1px solid var(--blue);
}

.page-about .ab-panel-list dt {
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--orange-soft);
}

.page-about .ab-panel-list dd {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.02em;
  text-align: right;
  color: var(--paper);
}

.page-about .ab-hero-strip {
  position: relative;
  display: grid;
  border-top: 1px solid var(--line);
  background: var(--paper);
}

.page-about .ab-strip-item {
  display: flex;
  align-items: baseline;
  gap: 12px;
  padding: 13px 0;
  border-bottom: 1px solid var(--grid);
}

.page-about .ab-strip-k {
  flex: none;
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--blue);
}

.page-about .ab-strip-v {
  font-size: 14px;
  line-height: 1.6;
  color: var(--sea);
}

/* ---------- 章节通用 ---------- */
.page-about .ab-sec {
  padding: 48px 0;
}

.page-about .ab-sec-head {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 12px;
  margin-bottom: 26px;
}

.page-about .ab-sec-idx {
  flex: none;
  padding: 4px 8px;
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.06em;
  color: var(--paper);
  background: var(--ink);
}

.page-about .ab-sec-head h2 {
  margin: 0;
  flex: 0 1 auto;
  max-width: 100%;
  font-size: clamp(20px, 3.6vw, 32px);
  font-weight: 800;
  line-height: 1.2;
  letter-spacing: -0.01em;
  color: var(--ink);
}

.page-about .ab-sec-rule {
  flex: 1 1 40px;
  min-width: 24px;
  height: 1px;
  background: var(--line);
}

/* ---------- 01 起点 ---------- */
.page-about .ab-start-grid {
  display: grid;
  gap: 24px;
}

.page-about .ab-quote {
  margin: 0;
  padding: 22px 20px;
  background: var(--ink);
  border-left: 3px solid var(--orange);
}

.page-about .ab-quote-text {
  margin: 0 0 14px;
  font-size: 18px;
  font-weight: 700;
  line-height: 1.7;
  color: var(--paper);
}

.page-about .ab-quote footer {
  font-family: var(--font-mono);
  font-size: 10.5px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--mint);
}

.page-about .ab-start-body p {
  margin: 0 0 16px;
  max-width: 36em;
  font-size: 16px;
  line-height: 1.85;
  color: var(--sea);
}

.page-about .ab-start-body .ab-point {
  margin-top: 22px;
  padding-top: 16px;
  border-top: 1px solid var(--line);
  font-weight: 600;
  color: var(--ink);
}

/* ---------- 02 四列 ---------- */
.page-about .ab-sec--dims {
  background: var(--grid);
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}

.page-about .ab-dim-grid {
  display: grid;
  gap: 26px;
}

.page-about .ab-dim-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 2px;
}

.page-about .ab-dim {
  display: grid;
  grid-template-columns: 46px minmax(0, 1fr);
  gap: 14px;
  padding: 18px 16px 18px 0;
  background: var(--paper);
  border-left: 2px solid var(--line);
  transition: border-color var(--t-fast) linear;
}

.page-about .ab-dim:hover {
  border-left-color: var(--orange);
}

.page-about .ab-dim-id {
  padding-left: 14px;
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 0.04em;
  color: var(--blue);
}

.page-about .ab-dim-body h3 {
  margin: 0 0 6px;
  font-size: 17px;
  font-weight: 800;
  letter-spacing: -0.01em;
  color: var(--ink);
}

.page-about .ab-dim-body p {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.8;
  color: var(--sea);
}

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

.page-about .ab-dim-figure .media {
  aspect-ratio: 3 / 2;
}

.page-about .ab-dim-note {
  margin: 26px 0 0;
  max-width: 52em;
  font-size: 14.5px;
  line-height: 1.85;
  color: var(--sea);
}

/* ---------- 03 团队 ---------- */
.page-about .ab-team-grid {
  display: grid;
  gap: 2px;
}

.page-about .ab-team-col {
  padding: 20px 18px 22px;
  background: var(--paper);
  border: 1px solid var(--grid);
  border-top: 3px solid var(--blue);
}

.page-about .ab-team-col:nth-child(1) {
  border-top-color: var(--orange);
}

.page-about .ab-team-col:nth-child(2) {
  border-top-color: var(--mint);
}

.page-about .ab-team-col:nth-child(3) {
  border-top-color: var(--blue);
}

.page-about .ab-team-count {
  display: block;
  font-family: var(--font-mono);
  font-size: 34px;
  font-weight: 600;
  line-height: 1;
  letter-spacing: 0.02em;
  font-variant-numeric: tabular-nums;
  color: var(--ink);
}

.page-about .ab-team-unit {
  display: block;
  margin: 6px 0 14px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--blue);
}

.page-about .ab-team-col h3 {
  margin: 0 0 10px;
  font-size: 17px;
  font-weight: 800;
  line-height: 1.4;
  color: var(--ink);
}

.page-about .ab-team-col p {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.85;
  color: var(--sea);
}

.page-about .ab-team-total {
  margin: 22px 0 0;
  padding: 14px 0 0;
  border-top: 1px solid var(--line);
  font-size: 14.5px;
  line-height: 1.85;
  font-weight: 600;
  color: var(--ink);
}

.page-about .ab-team-figure {
  margin: 26px 0 0;
}

.page-about .ab-team-figure .media {
  aspect-ratio: 3 / 2;
}

/* ---------- 04 时间线 ---------- */
.page-about .ab-sec--timeline {
  background: var(--ink);
  color: var(--paper);
}

.page-about .ab-sec--timeline .ab-sec-idx {
  background: var(--orange);
  color: var(--ink);
}

.page-about .ab-sec--timeline .ab-sec-head h2 {
  color: var(--paper);
}

.page-about .ab-sec--timeline .ab-sec-rule {
  background: var(--blue);
}

.page-about .ab-timeline {
  position: relative;
  list-style: none;
  margin: 0;
  padding: 0 0 0 24px;
}

.page-about .ab-timeline::before {
  content: "";
  position: absolute;
  left: 4px;
  top: 8px;
  bottom: 8px;
  width: 1px;
  background: var(--blue);
}

.page-about .ab-tl-item {
  position: relative;
  padding: 0 0 30px 0;
}

.page-about .ab-tl-item::before {
  content: "";
  position: absolute;
  left: -24px;
  top: 6px;
  width: 8px;
  height: 8px;
  background: var(--mint);
}

.page-about .ab-tl-meta {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px;
  margin: 0 0 8px;
}

.page-about .ab-tl-batch {
  padding: 2px 8px;
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.04em;
  color: var(--ink);
  background: var(--mint);
}

.page-about .ab-tl-phase {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--orange-soft);
}

.page-about .ab-tl-item h3 {
  margin: 0 0 6px;
  font-size: 17px;
  font-weight: 800;
  line-height: 1.4;
  letter-spacing: -0.01em;
  color: var(--paper);
}

.page-about .ab-tl-item p {
  margin: 0;
  max-width: 40em;
  font-size: 14.5px;
  line-height: 1.85;
  color: var(--grid);
}

.page-about .ab-tl-item p.ab-tl-meta {
  margin-bottom: 8px;
}

.page-about .ab-tl-figure {
  margin: 30px 0 0;
}

.page-about .ab-tl-figure .media {
  aspect-ratio: 2 / 1;
  border-color: var(--blue);
}

.page-about .ab-sec--timeline .media-cap {
  color: var(--grid);
}

/* ---------- 05 流程 ---------- */
.page-about .ab-flow {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 2px;
}

.page-about .ab-flow li {
  position: relative;
  padding: 16px 0 0;
  border-top: 2px solid var(--ink);
}

.page-about .ab-flow-num {
  display: block;
  margin-bottom: 10px;
  font-family: var(--font-mono);
  font-size: 26px;
  font-weight: 600;
  line-height: 1.1;
  letter-spacing: 0.02em;
  font-variant-numeric: tabular-nums;
  color: var(--orange);
}

.page-about .ab-flow li h3 {
  margin: 0 0 8px;
  font-size: 16px;
  font-weight: 800;
  line-height: 1.4;
  color: var(--ink);
}

.page-about .ab-flow li p {
  margin: 0;
  font-size: 14px;
  line-height: 1.8;
  color: var(--sea);
}

.page-about .ab-flow-note {
  margin: 26px 0 0;
  padding: 16px 18px;
  border-left: 3px solid var(--amber);
  background: rgba(255, 210, 63, 0.14);
  font-size: 14.5px;
  line-height: 1.85;
  color: var(--ink);
}

/* ---------- 06 合作 ---------- */
.page-about .ab-sec--partner {
  background: var(--sea);
  color: var(--paper);
}

.page-about .ab-sec--partner .ab-sec-idx {
  background: var(--orange);
  color: var(--ink);
}

.page-about .ab-sec--partner .ab-sec-head h2 {
  color: var(--paper);
}

.page-about .ab-sec--partner .ab-sec-rule {
  background: var(--blue);
}

.page-about .ab-partner-grid {
  display: grid;
  gap: 2px;
}

.page-about .ab-partner-card {
  padding: 20px 18px;
  background: rgba(245, 247, 244, 0.06);
  border-top: 2px solid var(--line);
}

.page-about .ab-partner-card:nth-child(1) {
  border-top-color: var(--orange);
}

.page-about .ab-partner-card:nth-child(2) {
  border-top-color: var(--mint);
}

.page-about .ab-partner-card:nth-child(3) {
  border-top-color: var(--orange-soft);
}

.page-about .ab-partner-card h3 {
  margin: 0 0 8px;
  font-size: 17px;
  font-weight: 800;
  color: var(--paper);
}

.page-about .ab-partner-card p {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.8;
  color: var(--grid);
}

.page-about .ab-partner-foot {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 18px;
  margin-top: 28px;
  padding-top: 22px;
  border-top: 1px solid var(--blue);
}

.page-about .ab-partner-foot p {
  flex: 1 1 260px;
  margin: 0;
  font-size: 14.5px;
  line-height: 1.85;
  color: var(--grid);
}

.page-about .ab-partner-foot .btn {
  text-decoration: none;
}

/* ---------- 响应式 ---------- */
@media (min-width: 640px) {
  .page-about .ab-hero-strip {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .page-about .ab-strip-item {
    padding: 16px 18px 16px 0;
    border-bottom: 0;
    border-right: 1px solid var(--grid);
  }

  .page-about .ab-strip-item:last-child {
    padding-right: 0;
    border-right: 0;
  }

  .page-about .ab-flow {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 24px 32px;
  }
}

@media (min-width: 800px) {
  .page-about .ab-hero {
    padding-top: 22px;
  }

  .page-about .ab-hero-grid {
    grid-template-columns: minmax(0, 1.55fr) minmax(0, 1fr);
    gap: 40px;
    padding: 32px 0 44px;
    align-items: start;
  }

  .page-about .ab-sec {
    padding: 68px 0;
  }

  .page-about .ab-sec-head {
    margin-bottom: 34px;
  }

  .page-about .ab-start-grid {
    grid-template-columns: minmax(0, 0.85fr) minmax(0, 1.15fr);
    gap: 44px;
    align-items: start;
  }

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

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

@media (min-width: 900px) {
  .page-about .ab-dim-grid {
    grid-template-columns: minmax(0, 1.1fr) minmax(0, 0.9fr);
    gap: 48px;
    align-items: start;
  }

  .page-about .ab-timeline {
    padding-left: 30px;
  }

  .page-about .ab-timeline::before {
    left: 5px;
  }

  .page-about .ab-tl-item::before {
    left: -30px;
    width: 10px;
    height: 10px;
  }
}

@media (min-width: 1000px) {
  .page-about .ab-flow {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 24px;
  }

  .page-about .ab-flow li:not(:last-child)::after {
    content: "";
    position: absolute;
    top: 31px;
    right: -24px;
    width: 24px;
    height: 1px;
    background: var(--line);
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .ab-dim {
    transition: none;
  }
}
<<<END>>>