.page-about {
  --ab-card: rgba(12, 21, 17, 0.88);
  --ab-card-soft: rgba(30, 58, 49, 0.32);
  --ab-sticky-top: 118px;
  position: relative;
  color: var(--yb-fog);
  background:
    radial-gradient(900px 460px at 92% -6%, rgba(62, 242, 196, 0.1), transparent 62%),
    radial-gradient(760px 420px at 4% 42%, rgba(22, 165, 107, 0.14), transparent 66%),
    linear-gradient(180deg, #060a08 0%, #08120e 48%, #060a08 100%);
  padding-block: clamp(16px, 2.6vw, 30px) clamp(48px, 7vw, 92px);
  overflow-x: clip;
}

.page-about .yb-breadcrumb {
  margin-bottom: clamp(14px, 2vw, 22px);
}

/* ---------- 首屏 ---------- */
.page-about .ab-hero__grid {
  display: grid;
  gap: clamp(20px, 3vw, 38px);
  padding: clamp(20px, 3.2vw, 44px);
  border-radius: var(--yb-radius);
  background:
    linear-gradient(158deg, rgba(11, 107, 72, 0.22), rgba(6, 10, 8, 0.94) 58%),
    var(--ab-card);
  box-shadow: var(--yb-shadow);
  align-items: center;
}

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

.page-about .ab-hero__copy h1 {
  margin: 12px 0 0;
  font-family: var(--yb-font-head);
  font-weight: 700;
  letter-spacing: -0.02em;
  line-height: 1.04;
  font-size: clamp(2.1rem, 5.4vw, 3.5rem);
  color: var(--yb-fog);
}

.page-about .ab-hero__lede {
  margin: 18px 0 0;
  max-width: 60ch;
  font-size: clamp(15px, 1.5vw, 17px);
  line-height: 1.8;
  color: var(--yb-sage);
}

.page-about .ab-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 24px;
}

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

.page-about .ab-hero__chips .yb-chip {
  display: inline-block;
  text-decoration: none;
  font-family: var(--yb-font-mono);
  border: 1px solid var(--yb-line);
  background: var(--yb-cyan-soft);
  color: var(--yb-cyan);
  transition: background 0.25s var(--yb-ease), color 0.25s var(--yb-ease), border-color 0.25s var(--yb-ease);
}

.page-about .ab-hero__chips .yb-chip:hover,
.page-about .ab-hero__chips .yb-chip:focus-visible {
  background: rgba(62, 242, 196, 0.22);
  border-color: var(--yb-cyan);
  color: var(--yb-fog);
}

.page-about .ab-hero__media {
  margin: 0;
  border-radius: var(--yb-radius-sm);
  border: 1px solid var(--yb-line);
}

.page-about .ab-hero__media .yb-media__img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
  border-radius: inherit;
}

.page-about .ab-stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 10px;
  margin: clamp(16px, 2.4vw, 24px) 0 0;
  padding: 0;
}

.page-about .ab-stat {
  padding: 16px 18px;
  border-radius: var(--yb-radius-sm);
  border: 1px solid var(--yb-line);
  background: linear-gradient(160deg, rgba(22, 165, 107, 0.16), rgba(6, 10, 8, 0.6));
}

.page-about .ab-stat dt {
  font-family: var(--yb-font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--yb-sage);
}

.page-about .ab-stat dd {
  margin: 8px 0 0;
  display: flex;
  align-items: baseline;
  gap: 4px;
  color: var(--yb-fog);
}

.page-about .ab-stat__num {
  font-family: var(--yb-font-mono);
  font-weight: 700;
  font-size: clamp(1.6rem, 4vw, 2.2rem);
  line-height: 1;
  color: var(--yb-cyan);
}

.page-about .ab-stat__unit {
  font-family: var(--yb-font-mono);
  font-size: 12px;
  color: var(--yb-sage);
}

/* ---------- 通用分区 ---------- */
.page-about .ab-section {
  padding-top: clamp(44px, 6vw, 82px);
}

.page-about .ab-section__intro {
  margin: 14px 0 0;
  max-width: 66ch;
  font-size: 15px;
  line-height: 1.8;
  color: var(--yb-sage);
}

.page-about .ab-split {
  display: grid;
  gap: clamp(18px, 3vw, 34px);
}

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

.page-about .ab-aside__card {
  padding: 20px;
  border-radius: var(--yb-radius);
  border: 1px solid var(--yb-line);
  background:
    linear-gradient(200deg, rgba(62, 242, 196, 0.12), transparent 64%),
    var(--ab-card);
}

.page-about .ab-aside__idx {
  margin: 0;
  font-family: var(--yb-font-mono);
  font-size: 12px;
  letter-spacing: 0.16em;
  color: var(--yb-orange);
}

.page-about .ab-aside__label {
  margin: 10px 0 0;
  font-family: var(--yb-font-head);
  font-weight: 700;
  font-size: 1.35rem;
  line-height: 1.24;
  letter-spacing: -0.01em;
  color: var(--yb-fog);
}

.page-about .ab-aside__text {
  margin: 10px 0 0;
  font-size: 14px;
  line-height: 1.75;
  color: var(--yb-sage);
}

.page-about .ab-aside__list {
  margin: 16px 0 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 8px;
}

.page-about .ab-aside__list li {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 10px;
  padding-bottom: 8px;
  border-bottom: 1px dashed rgba(30, 58, 49, 0.9);
  font-family: var(--yb-font-mono);
  font-size: 12px;
  color: var(--yb-sage);
}

.page-about .ab-aside__list li:last-child {
  border-bottom: 0;
  padding-bottom: 0;
}

.page-about .ab-aside__list strong {
  color: var(--yb-cyan);
  font-weight: 600;
}

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

.page-about .ab-prose {
  margin-top: 18px;
}

.page-about .ab-prose p {
  margin: 0 0 16px;
  font-size: clamp(15px, 1.4vw, 17px);
  line-height: 1.85;
  color: #cfe3da;
}

.page-about .ab-prose p:last-child {
  margin-bottom: 0;
}

/* ---------- 起点场景 ---------- */
.page-about .ab-scenes {
  display: grid;
  gap: 12px;
  margin: 26px 0 0;
  padding: 0;
  list-style: none;
}

.page-about .ab-scene {
  position: relative;
  padding: 18px 20px 20px;
  border-radius: var(--yb-radius-sm);
  border: 1px solid var(--yb-line);
  border-left: 3px solid var(--yb-green);
  background: var(--ab-card-soft);
  transition: border-color 0.3s var(--yb-ease), transform 0.3s var(--yb-ease);
}

.page-about .ab-scene:hover {
  border-left-color: var(--yb-cyan);
  transform: translateX(3px);
}

.page-about .ab-scene__tag {
  margin: 0;
  font-family: var(--yb-font-mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  color: var(--yb-cyan);
}

.page-about .ab-scene__title {
  margin: 8px 0 0;
  font-family: var(--yb-font-head);
  font-weight: 700;
  font-size: 1.18rem;
  letter-spacing: -0.01em;
  color: var(--yb-fog);
}

.page-about .ab-scene__text {
  margin: 8px 0 0;
  font-size: 14px;
  line-height: 1.75;
  color: var(--yb-sage);
}

/* ---------- 时间轴 ---------- */
.page-about .ab-section--timeline {
  position: relative;
}

.page-about .ab-section--timeline::before {
  content: "";
  position: absolute;
  inset: 0 0 auto;
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--yb-line), transparent);
}

.page-about .ab-timeline__figure {
  margin: 26px 0 0;
  border: 1px solid var(--yb-line);
  border-radius: var(--yb-radius);
  overflow: hidden;
}

.page-about .ab-timeline__figure .yb-media__img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
}

.page-about .ab-timeline {
  display: grid;
  gap: 12px;
  margin: 26px 0 0;
  padding: 0;
  list-style: none;
}

.page-about .ab-node {
  position: relative;
  padding: 18px 18px 20px;
  border-radius: var(--yb-radius-sm);
  border: 1px solid var(--yb-line);
  background: var(--ab-card);
  transition: border-color 0.3s var(--yb-ease), background 0.3s var(--yb-ease);
}

.page-about .ab-node:hover {
  border-color: rgba(62, 242, 196, 0.42);
  background: rgba(12, 21, 17, 0.98);
}

.page-about .ab-node__year {
  display: inline-block;
  font-family: var(--yb-font-mono);
  font-weight: 700;
  font-size: 13px;
  letter-spacing: 0.12em;
  color: var(--yb-black);
  background: var(--yb-cyan);
  border-radius: var(--yb-pill);
  padding: 3px 12px;
}

.page-about .ab-node__title {
  margin: 12px 0 0;
  font-family: var(--yb-font-head);
  font-weight: 700;
  font-size: 1.1rem;
  letter-spacing: -0.01em;
  color: var(--yb-fog);
}

.page-about .ab-node__text {
  margin: 8px 0 0;
  font-size: 13.5px;
  line-height: 1.75;
  color: var(--yb-sage);
}

/* ---------- 团队 ---------- */
.page-about .ab-team {
  display: grid;
  gap: clamp(18px, 3vw, 30px);
  margin-top: 22px;
}

.page-about .ab-team__media {
  margin: 0;
  border-radius: var(--yb-radius);
  border: 1px solid var(--yb-line);
  overflow: hidden;
}

.page-about .ab-team__media .yb-media__img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
}

.page-about .ab-metrics {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 10px;
  margin: 24px 0 0;
  padding: 0;
  list-style: none;
}

.page-about .ab-metrics li {
  padding: 14px 16px;
  border-radius: var(--yb-radius-sm);
  border: 1px dashed rgba(30, 58, 49, 0.95);
  background: rgba(6, 10, 8, 0.5);
}

.page-about .ab-metrics__num {
  display: block;
  font-family: var(--yb-font-mono);
  font-weight: 700;
  font-size: clamp(1.3rem, 3vw, 1.7rem);
  color: var(--yb-cyan);
  line-height: 1;
}

.page-about .ab-metrics__label {
  display: block;
  margin-top: 8px;
  font-size: 12.5px;
  line-height: 1.6;
  color: var(--yb-sage);
}

/* ---------- 覆盖与合作 ---------- */
.page-about .ab-coverage {
  display: grid;
  gap: 14px;
  margin-top: 26px;
}

.page-about .ab-coverage__panel {
  border-radius: var(--yb-radius);
  border: 1px solid var(--yb-line);
  background:
    linear-gradient(200deg, rgba(22, 165, 107, 0.16), transparent 62%),
    var(--ab-card);
}

.page-about .ab-coverage__title {
  margin: 0;
  font-family: var(--yb-font-head);
  font-weight: 700;
  font-size: 1.25rem;
  letter-spacing: -0.01em;
  color: var(--yb-fog);
}

.page-about .ab-coverage__text {
  margin: 12px 0 0;
  font-size: 14.5px;
  line-height: 1.8;
  color: var(--yb-sage);
}

.page-about .ab-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 16px 0 0;
  padding: 0;
  list-style: none;
}

.page-about .ab-tag {
  font-family: var(--yb-font-mono);
  font-size: 11.5px;
  letter-spacing: 0.04em;
  padding: 5px 12px;
  border-radius: var(--yb-pill);
  border: 1px solid rgba(62, 242, 196, 0.34);
  color: var(--yb-cyan);
  background: rgba(62, 242, 196, 0.08);
}

.page-about .ab-coverage__panel--wide {
  border-left: 3px solid var(--yb-orange);
}

/* ---------- 承诺 ---------- */
.page-about .ab-promises {
  display: grid;
  gap: 12px;
  margin: 26px 0 0;
  padding: 0;
  list-style: none;
}

.page-about .ab-promise {
  position: relative;
  padding: 20px;
  border-radius: var(--yb-radius);
  border: 1px solid var(--yb-line);
  background: rgba(12, 21, 17, 0.72);
}

.page-about .ab-promise__idx {
  margin: 0;
  font-family: var(--yb-font-mono);
  font-weight: 700;
  font-size: 12px;
  letter-spacing: 0.16em;
  color: var(--yb-orange);
}

.page-about .ab-promise__title {
  margin: 10px 0 0;
  font-family: var(--yb-font-head);
  font-weight: 700;
  font-size: 1.2rem;
  color: var(--yb-fog);
}

.page-about .ab-promise__text {
  margin: 8px 0 0;
  font-size: 14px;
  line-height: 1.78;
  color: var(--yb-sage);
}

.page-about .ab-cta {
  display: grid;
  gap: 18px;
  margin-top: 26px;
  padding: clamp(20px, 3vw, 32px);
  border-radius: var(--yb-radius);
  border: 1px solid rgba(62, 242, 196, 0.28);
  background:
    linear-gradient(140deg, rgba(11, 107, 72, 0.42), rgba(6, 10, 8, 0.96) 68%);
}

.page-about .ab-cta__text {
  margin: 0;
  max-width: 62ch;
  font-size: 15px;
  line-height: 1.8;
  color: #d6e9e0;
}

.page-about .ab-cta__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

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

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

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

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

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

  .page-about .ab-coverage__panel--wide {
    grid-column: 1 / -1;
  }
}

@media (min-width: 900px) {
  .page-about .ab-hero__grid {
    grid-template-columns: 1.08fr 0.92fr;
  }

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

  .page-about .ab-timeline {
    grid-auto-flow: column;
    grid-auto-columns: minmax(248px, 1fr);
    overflow-x: auto;
    padding: 22px 4px 18px;
    scroll-snap-type: x mandatory;
    border-top: 1px solid var(--yb-line);
    -webkit-overflow-scrolling: touch;
  }

  .page-about .ab-node {
    scroll-snap-align: start;
    margin-top: 10px;
  }

  .page-about .ab-node::before {
    content: "";
    position: absolute;
    top: 0;
    left: 20px;
    width: 10px;
    height: 10px;
    border-radius: 50%;
    background: var(--yb-cyan);
    transform: translateY(-50%);
    box-shadow: 0 0 0 4px rgba(62, 242, 196, 0.14);
  }

  .page-about .ab-node::after {
    content: "";
    position: absolute;
    top: 0;
    left: 34px;
    right: -14px;
    height: 1px;
    background: linear-gradient(90deg, rgba(62, 242, 196, 0.5), rgba(30, 58, 49, 0.2));
  }

  .page-about .ab-node:last-child::after {
    display: none;
  }

  .page-about .ab-cta {
    grid-template-columns: minmax(0, 1fr) auto;
    align-items: center;
  }
}

@media (min-width: 960px) {
  .page-about .ab-split {
    grid-template-columns: 300px minmax(0, 1fr);
    align-items: start;
  }

  .page-about .ab-aside {
    position: sticky;
    top: var(--ab-sticky-top);
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .ab-scene,
  .page-about .ab-node {
    transition: none;
  }

  .page-about .ab-scene:hover {
    transform: none;
  }
}