.page-about {
  --ab-line: rgba(30, 77, 63, .55);
  --ab-cut: 16px;
  background: var(--ink-900);
  color: var(--paper);
  overflow-x: hidden;
}

.page-about .ab-crumb-sep { color: var(--line); }

.page-about .breadcrumb {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 8px;
  padding: 26px 0 0;
  font-size: 13px;
  letter-spacing: .04em;
  color: var(--muted);
}
.page-about .breadcrumb a {
  color: var(--muted);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color var(--fast) var(--ease), border-color var(--fast) var(--ease);
}
.page-about .breadcrumb a:hover,
.page-about .breadcrumb a:focus-visible {
  color: var(--cyan);
  border-bottom-color: var(--cyan);
}

/* ---------- 首屏声明 ---------- */
.page-about .ab-hero {
  padding: clamp(34px, 5vw, 62px) 0 clamp(32px, 5vw, 54px);
}
.page-about .ab-hero h1 {
  margin: 18px 0 0;
  font-family: var(--font-head);
  font-weight: 800;
  font-size: clamp(1.9rem, 5.4vw, 3.4rem);
  line-height: 1.14;
  letter-spacing: -.02em;
  max-width: 22ch;
  color: var(--paper);
}
.page-about .ab-hero-lead {
  margin: 22px 0 0;
  max-width: 66ch;
  font-size: clamp(1rem, 1.5vw, 1.08rem);
  line-height: 1.82;
  color: var(--muted);
}
.page-about .ab-hero-actions {
  margin-top: 30px;
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
}

/* ---------- 图片容器 ---------- */
.page-about .ab-shot {
  position: relative;
  margin: 0;
  overflow: hidden;
  background: var(--ink-800);
  border: 1px solid var(--ab-line);
}
.page-about .ab-shot img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
}
.page-about .ab-shot--wide { aspect-ratio: 16 / 9; }
.page-about .ab-shot--team { aspect-ratio: 3 / 2; margin-top: clamp(28px, 4vw, 44px); }
.page-about .ab-shot--reading { aspect-ratio: 4 / 3; }

.page-about .ab-shot-caption {
  margin: 12px 0 0;
  font-size: .84rem;
  line-height: 1.7;
  color: var(--muted);
  letter-spacing: .02em;
}

/* ---------- 斜线分隔 ---------- */
.page-about .ab-slash {
  border: 0;
  height: 1px;
  margin: clamp(44px, 7vw, 92px) 0;
  background: var(--ab-line);
  transform: rotate(-1.4deg);
}

/* ---------- 章节容器 ---------- */
.page-about .ab-band { padding: clamp(46px, 7vw, 92px) 0; }
.page-about .ab-band--deep {
  background: linear-gradient(180deg, var(--ink-800) 0%, var(--ink-900) 100%);
  border-top: 1px solid var(--ab-line);
  border-bottom: 1px solid var(--ab-line);
}

.page-about .ab-sec-head { margin: 0 0 clamp(26px, 4vw, 44px); }
.page-about .ab-sec-head h2 {
  margin: 12px 0 0;
  font-family: var(--font-head);
  font-weight: 800;
  font-size: clamp(1.5rem, 3.4vw, 2.1rem);
  line-height: 1.22;
  letter-spacing: -.02em;
  max-width: 24ch;
}
.page-about .ab-sec-desc {
  margin: 12px 0 0;
  max-width: 60ch;
  color: var(--muted);
  line-height: 1.8;
}

/* ---------- 品牌立场 ---------- */
.page-about .ab-stance { display: grid; gap: clamp(28px, 4vw, 48px); }
.page-about .ab-stance h2 {
  margin: 12px 0 0;
  font-family: var(--font-head);
  font-weight: 800;
  font-size: clamp(1.5rem, 3.4vw, 2.1rem);
  line-height: 1.22;
  letter-spacing: -.02em;
  max-width: 22ch;
}
.page-about .ab-stance-lead {
  margin: 16px 0 0;
  max-width: 52ch;
  color: var(--muted);
  line-height: 1.82;
}
.page-about .ab-points {
  list-style: none;
  margin: 0;
  padding: 0;
}
.page-about .ab-points li {
  padding: 20px 0;
  border-top: 1px solid var(--ab-line);
}
.page-about .ab-points li:last-child { border-bottom: 1px solid var(--ab-line); }
.page-about .ab-point-title {
  display: flex;
  align-items: baseline;
  gap: 12px;
  margin: 0;
  font-family: var(--font-head);
  font-weight: 700;
  font-size: 1.02rem;
  letter-spacing: -.01em;
  color: var(--paper);
}
.page-about .ab-point-title .num {
  font-size: .78rem;
  letter-spacing: .08em;
  color: var(--cyan);
}
.page-about .ab-points li p:last-child {
  margin: 8px 0 0 0;
  max-width: 62ch;
  font-size: .94rem;
  line-height: 1.8;
  color: var(--muted);
}

/* ---------- 发展时间线 ---------- */
.page-about .ab-yearbar {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 0 0 clamp(28px, 4vw, 44px);
  padding: 0;
}
.page-about .ab-yearbar a {
  display: inline-block;
  padding: 8px 14px;
  font-family: var(--font-mono);
  font-size: .82rem;
  letter-spacing: .06em;
  color: var(--muted);
  text-decoration: none;
  border: 1px solid var(--ab-line);
  transition: color var(--fast) var(--ease), background-color var(--fast) var(--ease),
              border-color var(--fast) var(--ease);
}
.page-about .ab-yearbar a:hover,
.page-about .ab-yearbar a:focus-visible {
  color: var(--ink-900);
  background: var(--cyan);
  border-color: var(--cyan);
}

.page-about .ab-timeline {
  list-style: none;
  margin: 0;
  padding: 0 0 0 28px;
  border-left: 1px solid var(--ab-line);
  display: grid;
  gap: clamp(32px, 4vw, 50px);
}
.page-about .ab-node {
  position: relative;
  scroll-margin-top: 110px;
}
.page-about .ab-node::before {
  content: "";
  position: absolute;
  left: -32.5px;
  top: 9px;
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--cyan);
  box-shadow: 0 0 0 4px var(--cyan-12);
}
.page-about .ab-node-year {
  margin: 0;
  font-family: var(--font-mono);
  font-size: clamp(1.15rem, 2.6vw, 1.55rem);
  letter-spacing: .02em;
  color: var(--cyan);
  line-height: 1.1;
}
.page-about .ab-node h3 {
  margin: 8px 0 0;
  font-family: var(--font-head);
  font-weight: 700;
  font-size: clamp(1.05rem, 2vw, 1.2rem);
  line-height: 1.4;
  letter-spacing: -.01em;
  color: var(--paper);
}
.page-about .ab-node-body p {
  margin: 10px 0 0;
  max-width: 68ch;
  font-size: .95rem;
  line-height: 1.82;
  color: var(--muted);
}

/* ---------- 团队卡片 ---------- */
.page-about .ab-team {
  display: grid;
  gap: 18px;
}
.page-about .ab-card {
  position: relative;
  padding: 26px 22px 24px;
  background: var(--ink-800);
  border: 1px solid var(--ab-line);
  transition: background-color var(--base) var(--ease), border-color var(--base) var(--ease),
              transform var(--base) var(--ease);
}
.page-about .ab-card::before,
.page-about .ab-card::after {
  content: "";
  position: absolute;
  width: var(--ab-cut);
  height: var(--ab-cut);
  pointer-events: none;
}
.page-about .ab-card::before {
  top: -1px;
  left: -1px;
  background: linear-gradient(135deg, transparent 46%, var(--ab-line) 47%, var(--ab-line) 53%, transparent 54%);
}
.page-about .ab-card::after {
  right: -1px;
  bottom: -1px;
  background: linear-gradient(-45deg, transparent 46%, var(--ab-line) 47%, var(--ab-line) 53%, transparent 54%);
}
.page-about .ab-card:hover,
.page-about .ab-card:focus-visible {
  outline: none;
  background: var(--ink-700);
  border-color: var(--cyan);
  transform: translateY(-3px);
}
.page-about .ab-card-num {
  margin: 16px 0 0;
  font-family: var(--font-mono);
  font-size: clamp(2rem, 5vw, 2.6rem);
  line-height: 1;
  letter-spacing: -.02em;
  color: var(--cyan);
}
.page-about .ab-card h3 {
  margin: 14px 0 0;
  font-family: var(--font-head);
  font-weight: 700;
  font-size: 1.06rem;
  line-height: 1.42;
  letter-spacing: -.01em;
  color: var(--paper);
}
.page-about .ab-card-desc {
  margin: 10px 0 0;
  font-size: .93rem;
  line-height: 1.8;
  color: var(--muted);
}
.page-about .ab-card-more {
  margin: 14px 0 0;
  padding-top: 14px;
  border-top: 1px dashed var(--ab-line);
  font-size: .88rem;
  line-height: 1.72;
  color: var(--cyan-soft);
}

/* ---------- 观察方法 ---------- */
.page-about .ab-observe { display: grid; gap: clamp(26px, 4vw, 44px); }
.page-about .ab-observe h2 {
  margin: 12px 0 0;
  font-family: var(--font-head);
  font-weight: 800;
  font-size: clamp(1.45rem, 3.2vw, 2rem);
  line-height: 1.24;
  letter-spacing: -.02em;
  max-width: 22ch;
}
.page-about .ab-observe p {
  margin: 16px 0 0;
  max-width: 62ch;
  font-size: .96rem;
  line-height: 1.85;
  color: var(--muted);
}
.page-about .ab-quote {
  margin: 26px 0 0;
  padding: 4px 0 4px 20px;
  border-left: 2px solid var(--cyan);
  font-family: var(--font-head);
  font-weight: 600;
  font-size: clamp(1rem, 1.8vw, 1.12rem);
  line-height: 1.75;
  letter-spacing: -.005em;
  color: var(--paper);
}

/* ---------- 数字方阵 ---------- */
.page-about .ab-figs {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--ab-line);
  border: 1px solid var(--ab-line);
}
.page-about .ab-fig {
  background: var(--ink-800);
  padding: 24px 18px;
}
.page-about .ab-fig-num {
  margin: 0;
  font-family: var(--font-mono);
  font-size: clamp(1.7rem, 4.2vw, 2.2rem);
  line-height: 1;
  letter-spacing: -.02em;
  color: var(--paper);
}
.page-about .ab-fig-num .ab-unit {
  margin-left: 4px;
  font-size: .74rem;
  letter-spacing: .06em;
  color: var(--muted);
}
.page-about .ab-fig-label {
  margin: 12px 0 0;
  font-size: .87rem;
  line-height: 1.68;
  color: var(--muted);
}

/* ---------- 认可列表 ---------- */
.page-about .ab-awards {
  list-style: none;
  margin: clamp(26px, 4vw, 40px) 0 0;
  padding: 0;
}
.page-about .ab-award {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 8px 18px;
  padding: 16px 0;
  border-top: 1px solid var(--ab-line);
}
.page-about .ab-award:last-child { border-bottom: 1px solid var(--ab-line); }
.page-about .ab-award-year {
  font-family: var(--font-mono);
  font-size: .84rem;
  letter-spacing: .06em;
  color: var(--amber);
}
.page-about .ab-award-name {
  font-family: var(--font-head);
  font-weight: 700;
  font-size: .98rem;
  letter-spacing: -.005em;
  color: var(--paper);
}
.page-about .ab-award-note {
  font-size: .86rem;
  line-height: 1.7;
  color: var(--muted);
}

/* ---------- 运营与联系 ---------- */
.page-about .ab-ops {
  padding: clamp(24px, 4vw, 38px);
  background: var(--ink-800);
  border: 1px solid var(--ab-line);
  border-left: 3px solid var(--cyan);
}
.page-about .ab-ops-text {
  margin: 0;
  max-width: 72ch;
  font-size: .96rem;
  line-height: 1.85;
  color: var(--muted);
}
.page-about .ab-ops-text .mono {
  color: var(--paper);
  font-size: .93rem;
  letter-spacing: .01em;
  word-break: break-all;
}
.page-about .ab-ops-actions {
  margin-top: 26px;
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
}

/* ---------- 响应式 ---------- */
@media (min-width: 620px) {
  .page-about .ab-team { grid-template-columns: repeat(3, minmax(0, 1fr)); }
  .page-about .ab-figs { grid-template-columns: repeat(4, minmax(0, 1fr)); }
  .page-about .ab-fig { padding: 26px 20px; }
}

@media (min-width: 860px) {
  .page-about .ab-node {
    display: grid;
    grid-template-columns: 108px minmax(0, 1fr);
    column-gap: 28px;
    align-items: start;
  }
  .page-about .ab-node-year { grid-column: 1; }
  .page-about .ab-node-body { grid-column: 2; }
  .page-about .ab-node h3 { margin-top: 0; }
}

@media (min-width: 960px) {
  .page-about .ab-observe {
    grid-template-columns: minmax(0, 5fr) minmax(0, 7fr);
    align-items: center;
    column-gap: clamp(40px, 5vw, 64px);
  }
}

@media (min-width: 1000px) {
  .page-about .ab-stance {
    grid-template-columns: minmax(0, 5fr) minmax(0, 7fr);
    column-gap: clamp(40px, 5vw, 68px);
    align-items: start;
  }
  .page-about .ab-hero h1 { max-width: 24ch; }
}

@media (min-width: 900px) and (hover: hover) {
  .page-about .ab-card-more {
    max-height: 0;
    opacity: 0;
    overflow: hidden;
    margin-top: 0;
    padding-top: 0;
    border-top-color: transparent;
    transition: max-height var(--base) var(--ease), opacity var(--base) var(--ease),
                margin-top var(--base) var(--ease), padding-top var(--base) var(--ease);
  }
  .page-about .ab-card:hover .ab-card-more,
  .page-about .ab-card:focus .ab-card-more {
    max-height: 220px;
    opacity: 1;
    margin-top: 14px;
    padding-top: 14px;
    border-top-color: var(--ab-line);
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .ab-card,
  .page-about .ab-card-more,
  .page-about .ab-yearbar a,
  .page-about .breadcrumb a {
    transition: none;
  }
  .page-about .ab-card:hover,
  .page-about .ab-card:focus-visible {
    transform: none;
  }
}