.page-about {
  --ab-rail: 208px;
  --ab-rule: rgba(19, 32, 44, 0.14);
  background: var(--cream);
  color: var(--ink);
}

/* 面包屑 */
.page-about .ab-crumbs {
  padding-top: 20px;
  padding-bottom: 14px;
}
.page-about .breadcrumb ol {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 0;
  padding: 0;
  list-style: none;
  font-size: 13px;
  color: var(--stone);
}
.page-about .breadcrumb li {
  display: inline-flex;
  align-items: baseline;
}
.page-about .breadcrumb li + li::before {
  content: "/";
  margin-right: 8px;
  color: rgba(110, 116, 114, 0.6);
}
.page-about .breadcrumb a {
  color: var(--deep);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: border-color 0.2s var(--ease);
}
.page-about .breadcrumb a:hover {
  border-bottom-color: var(--copper);
}

/* 首屏 */
.page-about .ab-hero {
  position: relative;
  overflow: hidden;
  isolation: isolate;
  background: var(--deep);
  color: var(--cream);
  padding: 44px 0 0;
}
.page-about .ab-hero::before {
  content: "";
  position: absolute;
  top: -30%;
  right: -14%;
  width: 60%;
  height: 175%;
  background: linear-gradient(155deg, rgba(22, 67, 107, 0.95), rgba(14, 42, 71, 0) 72%);
  transform: skewX(-12deg);
  z-index: -1;
  pointer-events: none;
}
.page-about .ab-hero::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--copper), var(--signal) 58%, rgba(242, 106, 46, 0));
  pointer-events: none;
}
.page-about .ab-hero-inner {
  display: grid;
  gap: 30px;
}
.page-about .ab-eyebrow {
  margin: 0 0 16px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--copper);
}
.page-about .ab-hero h1 {
  margin: 0 0 18px;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(32px, 8vw, 72px);
  line-height: 1.04;
  letter-spacing: -0.01em;
  color: var(--cream);
  max-width: 15em;
}
.page-about .ab-hero-text {
  margin: 0 0 26px;
  max-width: 36em;
  font-size: 16px;
  line-height: 1.85;
  color: rgba(244, 239, 230, 0.82);
}
.page-about .ab-hero-actions {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 16px;
}
.page-about .ab-hero-link {
  font-size: 14px;
  color: var(--cream);
  text-decoration: none;
  border-bottom: 1px solid var(--copper);
  padding-bottom: 2px;
  transition: color 0.2s var(--ease);
}
.page-about .ab-hero-link:hover {
  color: var(--copper);
}
.page-about .ab-hero-side {
  align-self: start;
  border: 1px solid rgba(184, 134, 59, 0.45);
  background: rgba(19, 32, 44, 0.38);
  padding: 18px 18px 6px;
}
.page-about .ab-hero-tag {
  margin: 0 0 14px;
  font-size: 11px;
  letter-spacing: 0.16em;
  color: var(--copper);
}
.page-about .ab-hero-facts {
  margin: 0;
  padding: 0;
}
.page-about .ab-hero-facts > div {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 12px;
  padding: 12px 0;
  border-top: 1px solid rgba(244, 239, 230, 0.16);
}
.page-about .ab-hero-facts dt {
  margin: 0;
  font-size: 13px;
  color: rgba(244, 239, 230, 0.7);
}
.page-about .ab-hero-facts dd {
  margin: 0;
  font-size: 20px;
  font-weight: 700;
  color: var(--cream);
  letter-spacing: 0.02em;
}
.page-about .ab-stat-strip {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 16px;
  margin-top: 38px;
  padding-top: 20px;
  padding-bottom: 24px;
  border-top: 1px solid rgba(184, 134, 59, 0.35);
}
.page-about .ab-stat {
  display: flex;
  flex-direction: column;
  gap: 4px;
  min-width: 0;
}
.page-about .ab-stat-num {
  font-size: 22px;
  font-weight: 700;
  line-height: 1.1;
  color: var(--copper);
}
.page-about .ab-stat-label {
  font-size: 12px;
  line-height: 1.5;
  color: rgba(244, 239, 230, 0.72);
}

/* 主体骨架：左索引 + 右内容 */
.page-about .ab-shell {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  padding-top: 10px;
  padding-bottom: 60px;
}
.page-about .ab-index {
  border-top: 2px solid var(--copper);
  padding-top: 14px;
  margin-bottom: 6px;
}
.page-about .ab-index-label {
  margin: 0 0 12px;
  font-size: 11px;
  letter-spacing: 0.18em;
  color: var(--stone);
}
.page-about .ab-index-list {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin: 0 0 12px;
  padding: 0;
  list-style: none;
}
.page-about .ab-index-list a {
  display: inline-flex;
  align-items: baseline;
  gap: 8px;
  padding: 4px 10px;
  font-size: 13px;
  color: var(--deep);
  text-decoration: none;
  border: 1px solid var(--line-soft);
  background: rgba(244, 239, 230, 0.6);
  transition: border-color 0.2s var(--ease), background 0.2s var(--ease);
}
.page-about .ab-index-list a:hover {
  border-color: var(--copper);
  background: rgba(217, 209, 196, 0.6);
}
.page-about .ab-index-list .mono {
  font-size: 11px;
  color: var(--copper);
}
.page-about .ab-index-note {
  margin: 0;
  font-size: 12px;
  line-height: 1.7;
  color: var(--stone);
}

/* 章节 */
.page-about .ab-sec {
  padding: 32px 0 36px;
  border-top: 1px solid var(--line-soft);
}
.page-about .ab-sec:first-of-type {
  border-top: 0;
  padding-top: 22px;
}
.page-about .ab-sec-head {
  display: flex;
  align-items: baseline;
  gap: 12px;
  margin-bottom: 20px;
}
.page-about .sec-num {
  flex: none;
  padding: 2px 8px;
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--copper);
  border: 1px solid rgba(184, 134, 59, 0.5);
}
.page-about .ab-sec-head h2 {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(22px, 5vw, 36px);
  line-height: 1.14;
  letter-spacing: -0.005em;
  color: var(--deep);
}
.page-about .ab-lead {
  margin: 0 0 22px;
  max-width: 40em;
  font-size: 16px;
  line-height: 1.85;
  color: var(--ink);
}

/* 时间线 */
.page-about .ab-timeline {
  position: relative;
  margin: 0 0 26px;
  padding: 0;
  list-style: none;
}
.page-about .ab-timeline::before {
  content: "";
  position: absolute;
  left: 5px;
  top: 8px;
  bottom: 8px;
  width: 2px;
  background: linear-gradient(180deg, var(--copper), rgba(184, 134, 59, 0.16));
}
.page-about .ab-tl-item {
  position: relative;
  padding-left: 28px;
  padding-bottom: 20px;
}
.page-about .ab-tl-item:last-child {
  padding-bottom: 0;
}
.page-about .ab-tl-item::before {
  content: "";
  position: absolute;
  left: 0;
  top: 5px;
  width: 12px;
  height: 12px;
  background: var(--cream);
  border: 2px solid var(--copper);
  border-radius: 50%;
}
.page-about .ab-tl-year {
  display: block;
  margin-bottom: 4px;
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--copper);
}
.page-about .ab-tl-body h3 {
  margin: 0 0 6px;
  font-family: var(--font-body);
  font-size: 17px;
  font-weight: 700;
  color: var(--deep);
}
.page-about .ab-tl-body p {
  margin: 0;
  max-width: 38em;
  font-size: 15px;
  line-height: 1.8;
  color: var(--stone);
}

/* 图片 */
.page-about .ab-figure {
  margin: 6px 0 24px;
}
.page-about .ab-figure img {
  display: block;
  max-width: 100%;
  height: auto;
  object-fit: cover;
}
.page-about .ab-figure .media-caption {
  margin-top: 10px;
  font-size: 13px;
  line-height: 1.7;
  color: var(--stone);
}

/* 编目面板 */
.page-about .ab-panel {
  margin-bottom: 20px;
  padding: 22px 18px;
  border: 1px solid var(--line);
}
.page-about .ab-panel--sand {
  background: var(--sand);
  border-color: rgba(19, 32, 44, 0.1);
}
.page-about .ab-panel-title {
  margin: 0 0 18px;
  font-family: var(--font-display);
  font-size: 20px;
  letter-spacing: 0.01em;
  color: var(--deep);
}
.page-about .ab-steps {
  display: grid;
  gap: 16px;
  margin: 0;
  padding: 0;
  list-style: none;
}
.page-about .ab-step {
  border-left: 2px solid rgba(19, 32, 44, 0.16);
  padding-left: 14px;
  transition: border-color 0.2s var(--ease), background 0.2s var(--ease);
}
.page-about .ab-step:hover {
  border-left-color: var(--signal);
  background: rgba(244, 239, 230, 0.7);
}
.page-about .ab-step-num {
  display: block;
  margin-bottom: 6px;
  font-size: 12px;
  color: var(--clay);
}
.page-about .ab-step h4 {
  margin: 0 0 6px;
  font-size: 16px;
  color: var(--deep);
}
.page-about .ab-step p {
  margin: 0;
  font-size: 14px;
  line-height: 1.75;
  color: #3b4744;
}
.page-about .ab-panel-foot {
  margin: 18px 0 0;
  padding-top: 12px;
  border-top: 1px solid rgba(19, 32, 44, 0.14);
  font-size: 13px;
  line-height: 1.75;
  color: var(--stone);
}

/* 团队 */
.page-about .ab-team-grid {
  display: grid;
  gap: 24px;
}
.page-about .ab-roles {
  position: relative;
  display: grid;
  gap: 10px;
  padding-left: 22px;
}
.page-about .ab-roles::before {
  content: "";
  position: absolute;
  left: 4px;
  top: 12px;
  bottom: 12px;
  width: 2px;
  background: linear-gradient(180deg, var(--moss), rgba(95, 116, 97, 0.14));
}
.page-about .ab-role {
  position: relative;
  border: 1px solid var(--line);
  background: #fff;
}
.page-about .ab-role::before {
  content: "";
  position: absolute;
  left: -18px;
  top: 21px;
  width: 14px;
  height: 2px;
  background: var(--moss);
}
.page-about .ab-role-head {
  display: flex;
  align-items: center;
  gap: 10px;
  width: 100%;
  padding: 12px 14px;
  background: none;
  border: 0;
  font: inherit;
  color: var(--deep);
  text-align: left;
  cursor: pointer;
}
.page-about .ab-role-id {
  flex: none;
  padding: 2px 6px;
  font-size: 11px;
  color: var(--cream);
  background: var(--moss);
}
.page-about .ab-role-name {
  flex: 1 1 auto;
  min-width: 0;
  font-size: 15px;
  font-weight: 700;
}
.page-about .ab-role-key {
  flex: none;
  font-size: 12px;
  color: var(--stone);
}
.page-about .ab-role .fold-inner {
  padding: 0 14px 14px;
  font-size: 14px;
  line-height: 1.8;
  color: var(--stone);
}
.page-about .ab-role .fold-inner p {
  margin: 0;
}
.page-about .ab-team-figure {
  margin-bottom: 0;
}

/* 覆盖行业 */
.page-about .ab-sectors {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  margin: 0 0 20px;
  padding: 0;
  list-style: none;
  border-top: 1px solid var(--ab-rule);
  border-left: 1px solid var(--ab-rule);
}
.page-about .ab-sectors li {
  display: flex;
  align-items: baseline;
  gap: 8px;
  padding: 11px 12px;
  border-right: 1px solid var(--ab-rule);
  border-bottom: 1px solid var(--ab-rule);
  font-size: 14px;
  color: var(--deep);
  background: rgba(217, 209, 196, 0.28);
  min-width: 0;
}
.page-about .ab-sectors .mono {
  font-size: 11px;
  color: var(--clay);
}
.page-about .ab-note {
  margin: 0;
  padding-left: 12px;
  border-left: 2px solid var(--copper);
  font-size: 13px;
  line-height: 1.8;
  color: var(--stone);
}

/* 生态 */
.page-about .ab-eco-grid {
  display: grid;
  gap: 14px;
  margin-bottom: 18px;
}
.page-about .ab-eco-card {
  padding: 18px 16px;
  background: rgba(244, 239, 230, 0.7);
  border: 1px solid var(--line);
  border-bottom: 3px solid var(--copper);
}
.page-about .ab-eco-card h3 {
  margin: 12px 0 8px;
  font-family: var(--font-display);
  font-size: 30px;
  line-height: 1;
  color: var(--deep);
}
.page-about .ab-eco-card p {
  margin: 0;
  font-size: 14px;
  line-height: 1.75;
  color: var(--stone);
}
.page-about .ab-eco-link {
  margin: 0;
  font-size: 14px;
  line-height: 1.8;
  color: var(--stone);
}
.page-about .ab-eco-link a {
  color: var(--clay);
  text-decoration: none;
  border-bottom: 1px solid currentColor;
}

/* 收束 */
.page-about .ab-promise-grid {
  display: grid;
  gap: 14px;
}
.page-about .ab-promise-card {
  display: flex;
  flex-direction: column;
  gap: 10px;
  padding: 20px 18px;
  background: #fff;
  border: 1px solid var(--line);
  border-top: 3px solid var(--copper);
}
.page-about .ab-promise-card h3 {
  margin: 0;
  font-size: 17px;
  color: var(--deep);
}
.page-about .ab-promise-card p {
  flex: 1 1 auto;
  margin: 0;
  font-size: 14px;
  line-height: 1.75;
  color: var(--stone);
}
.page-about .ab-promise-card .btn {
  align-self: flex-start;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 10px 18px;
  font-size: 14px;
  font-weight: 600;
  text-decoration: none;
  border-radius: var(--radius);
  transition: transform 0.18s var(--ease);
}
.page-about .ab-promise-card .btn:hover {
  transform: translateY(-1px);
}
.page-about .ab-promise-card--signal {
  background: var(--deep);
  border-color: var(--deep);
  border-top-color: var(--signal);
}
.page-about .ab-promise-card--signal h3 {
  color: var(--cream);
}
.page-about .ab-promise-card--signal p {
  color: rgba(244, 239, 230, 0.76);
}

/* 平板及以上 */
@media (min-width: 720px) {
  .page-about .ab-hero {
    padding-top: 56px;
  }
  .page-about .ab-hero-inner {
    grid-template-columns: minmax(0, 1.6fr) minmax(240px, 0.8fr);
    align-items: start;
    gap: 36px;
  }
  .page-about .ab-stat-strip {
    gap: 24px;
    margin-top: 46px;
    padding-top: 22px;
    padding-bottom: 28px;
  }
  .page-about .ab-stat-num {
    font-size: 28px;
  }
  .page-about .ab-steps {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 0;
  }
  .page-about .ab-step {
    padding: 0 16px;
    border-left: 2px solid rgba(19, 32, 44, 0.16);
  }
  .page-about .ab-step:first-child {
    padding-left: 0;
    border-left: 0;
  }
  .page-about .ab-sectors {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
  .page-about .ab-eco-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
  .page-about .ab-promise-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

/* 桌面：左窄右宽档案栏 */
@media (min-width: 900px) {
  .page-about .ab-shell {
    grid-template-columns: var(--ab-rail) minmax(0, 1fr);
    column-gap: 52px;
    padding-bottom: 76px;
  }
  .page-about .ab-index {
    grid-column: 1;
    grid-row: 1 / -1;
    position: sticky;
    top: 24px;
    align-self: start;
    margin-bottom: 0;
  }
  .page-about .ab-index-list {
    flex-direction: column;
    gap: 0;
  }
  .page-about .ab-index-list a {
    display: flex;
    width: 100%;
    padding: 9px 0;
    border: 0;
    border-bottom: 1px solid var(--line-soft);
    background: none;
    box-sizing: border-box;
  }
  .page-about .ab-index-list a:hover {
    background: rgba(217, 209, 196, 0.5);
    border-bottom-color: var(--copper);
  }
  .page-about .ab-index-note {
    padding-top: 4px;
    border-top: 1px solid var(--line-soft);
  }
  .page-about .ab-sec {
    grid-column: 2;
    padding: 38px 0 44px;
  }
  .page-about .ab-sec:first-of-type {
    padding-top: 26px;
  }
  .page-about .ab-sec-head {
    gap: 16px;
    margin-bottom: 24px;
  }
  .page-about .ab-team-grid {
    grid-template-columns: minmax(0, 1.15fr) minmax(0, 0.85fr);
    align-items: start;
    gap: 32px;
  }
  .page-about .ab-panel {
    padding: 26px 26px 22px;
  }
  .page-about .ab-eco-card {
    padding: 20px 18px;
  }
  .page-about .ab-promise-card {
    padding: 22px 20px;
  }
}
<<<END>>>